Vibration device and electronic device and vehicle including the same

Abstract

Vibration device and electronic device and vehicle including the same. A vibration device includes a lower vibration structure, an upper vibration structure located on the lower vibration structure, and an adhesive member located between the lower vibration structure and the upper vibration structure. The lower vibration structure and the upper vibration structure are configured to generate sound waves having different frequencies.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a vibration device, an electronic device including the same, and a vehicle including the same. BACKGROUND

[0002] In a display device, a display panel displays an image, and a separate speaker should be installed to provide sound. When the speaker is located in the display device, the speaker occupies space, and due to this, the design and spatial arrangement of the display device are limited.

[0003] However, because sound output from the speaker can be propagated to the rearward or downward direction of the display device, sound quality can be degraded due to interference between sound reflected from walls and the floor. Therefore, it can be difficult to deliver accurate sound, and the immersion experience of the viewer is reduced. SUMMARY

[0004] The inventors have conducted various experiments on a vibration device and a device including the same, which can output accurate sound or directionality-based sound to a user (or a viewer). Through various experiments, the inventors have invented a vibration device, a device including the same, and a vehicle including the device, which can output sound or directionality-based sound to a user.

[0005] Therefore, embodiments of the disclosure relate to a vibration device, a device including the same, and a vehicle including the same, which substantially obviate one or more problems due to limitations and disadvantages of the related art.

[0006] An aspect of the disclosure is to provide a vibration device, a device including the same, and a vehicle including the same, which can output directionality-based sound.

[0007] Another aspect of the disclosure is to provide a vibration device, a device including the same, and a vehicle including the device, which can output directionality-based sound and can enhance the bass band characteristic of sound.

[0008] Additional features and aspects will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the invention provided herein. The features and aspects of the invention can be realized and attained by means of the instrumentalities particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0009] To achieve these and other aspects of the inventive concept, as embodied and broadly described herein, a vibration device includes a lower vibration structure, an upper vibration structure located on the lower vibration structure, and an adhesive member located between the lower vibration structure and the upper vibration structure, wherein the lower vibration structure and the upper vibration structure are configured to generate acoustic waves having different frequencies.

[0010] In another aspect, an electronic device includes a vibration member, a vibration generating device located in the vibration member, and a connection member located between the vibration member and the vibration generating device, wherein the vibration generating device includes the vibration device including a lower vibration structure, an upper vibration structure located on the lower vibration structure, and an adhesive member located between the lower vibration structure and the upper vibration structure, wherein the lower vibration structure and the upper vibration structure are configured to generate acoustic waves having different frequencies.

[0011] In another aspect, a vehicle includes a vehicle interior material covering a vehicle structure and a sound generating device provided at the vehicle interior material, the sound generating device including a vibration device, and the vehicle interior material is vibrated to output sound according to vibration of the sound generating device, the vibration device including a lower vibration structure, an upper vibration structure located on the lower vibration structure, and an adhesive member located between the lower vibration structure and the upper vibration structure, wherein the lower vibration structure and the upper vibration structure are configured to generate acoustic waves having different frequencies.

[0012] Each of the vibration device according to an embodiment of the disclosure, the device including the same, and the vehicle including the same can output a directionality-based sound.

[0013] Each of the vibration device according to an embodiment of the disclosure, the device including the same, and the vehicle including the same can output a directionality-based sound, and can enhance a sound characteristic including a low-pitched sound band characteristic of the sound.

[0014] Other systems, methods, features, and advantages will be or will become apparent to one with skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this description, be within the scope of the disclosure, and be protected by the accompanying claims. Nothing in this section should be taken as a limitation on the claims. Additional aspects and advantages are discussed below in conjunction with the embodiments of the disclosure.

[0015] It is to be understood that both the foregoing general description and the following detailed description of the disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed.

[0016] Note 1. A vibration device comprising:

[0017] a lower vibration structure;

[0018] an upper vibration structure on the lower vibration structure; and

[0019] an adhesive member between the lower vibration structure and the upper vibration structure,

[0020] wherein the lower vibration structure and the upper vibration structure are configured to generate acoustic waves having different frequencies.

[0021] Note 2. The vibration device according to Note 1, wherein the acoustic waves generated from at least one of the lower vibration structure and the upper vibration structure include ultrasonic waves.

[0022] Note 3. The vibration device according to Note 1, wherein the adhesive member has a Young's modulus of 10 7 Pa or more, or a Shore hardness of 50 or more.

[0023] Note 4. The vibration device according to Note 2, wherein the acoustic waves generated from each of the lower vibration structure and the upper vibration structure are one or more of audible frequencies, ultrasonic waves of an inaudible frequency band, and ultrasonic waves of an inaudible frequency band including audible frequencies.

[0024] Note 5. The vibration device according to Note 2,

[0025] wherein the acoustic waves generated from the lower vibration structure are ultrasonic waves of an inaudible frequency band, and

[0026] wherein the acoustic waves generated from the upper vibration structure are ultrasonic waves of an inaudible frequency band including audible frequencies.

[0027] Note 6. The vibration device according to Note 1, wherein each of the lower vibration structure and the upper vibration structure includes:

[0028] a first base member;

[0029] a second base member overlapping with the first base member; and

[0030] a plurality of vibration generation portions provided between the first base member and the second base member.

[0031] Note 7. The vibration device according to Note 6, wherein each of the lower vibration structure and the upper vibration structure further includes:

[0032] an adhesive layer provided between the first base member and the second base member to surround a side surface of each of the plurality of vibration generation portions.

[0033] Note 8. The vibration device of Note 7, wherein the adhesive layer comprises:

[0034] a first adhesive layer disposed at a rear surface of the first base member; and

[0035] a second adhesive layer disposed at an upper surface of the second base member.

[0036] Note 9. The vibration device of Note 8, wherein each of the first adhesive layer and the second adhesive layer comprises an electrically insulating material having adhesiveness and comprising a material capable of compression and decompression.

[0037] Note 10. The vibration device of Note 6, wherein the plurality of vibration generation portions have a circular band shape, an elliptical band shape, or a ring shape with an open portion.

[0038] Note 11. The vibration device of Note 6, wherein the plurality of vibration generation portions of the upper vibration structure comprise a pair of vibration generation portions having a non-linear shape.

[0039] Note 12. The vibration device of Note 6, wherein each of the plurality of vibration generation portions disposed at the upper vibration structure overlaps with a corresponding vibration generation portion of the plurality of vibration generation portions disposed at the lower vibration structure.

[0040] Note 13. The vibration device of Note 6, wherein each of the lower vibration structure and the upper vibration structure comprises:

[0041] a plurality of first power supply electrodes disposed at the first base member and electrically connected to a first surface of each of the plurality of vibration generation portions;

[0042] a plurality of second power supply electrodes disposed at the second base member to respectively cross the plurality of first power supply electrodes and electrically connected to a second surface of each of the plurality of vibration generation portions;

[0043] a plurality of first power supply lines disposed at the first base member and electrically connected to each of the plurality of first power supply electrodes; and

[0044] a plurality of second power supply lines disposed at the second base member and electrically connected to each of the plurality of second power supply electrodes.

[0045] Note 14. The vibration device of Note 13, wherein each of the lower vibration structure and the upper vibration structure comprises:

[0046] a pad portion electrically connected to the plurality of first power supply lines and the plurality of second power supply lines; and

[0047] a flexible cable electrically connected to the pad portion.

[0048] Note 15. The vibration device according to Note 14, wherein the pad portion includes a plurality of first pads and a plurality of second pads, the plurality of first pads are provided in parallel at a first peripheral portion of a second surface peripheral portion of the first base member, and the plurality of second pads are provided in parallel at a first peripheral portion of a first surface peripheral portion of the second base member.

[0049] Note 16. The vibration device according to Note 15, wherein each of the plurality of first pads is electrically connected to each of the plurality of first power supply electrodes through one of the plurality of first power supply lines, and each of the plurality of second pads is electrically connected to each of the plurality of second power supply electrodes through one of the plurality of second power supply lines.

[0050] Note 17. The vibration device according to Note 15, wherein one or more of the first base member and the second base member include a plurality of pad holes that overlap with the plurality of first pads and the plurality of second pads, respectively.

[0051] Note 18. The vibration device according to Note 14, wherein the flexible cable of each of the lower vibration structure and the upper vibration structure includes a plurality of protruding lines electrically connected to the pad portion and provided between the first base member and the second base member.

[0052] Note 19. The vibration device according to Note 13, wherein each of the plurality of vibration generation portions is provided at a crossing portion between each of the plurality of first power supply electrodes and each of the plurality of second power supply electrodes, and is spaced apart from each other in a first direction and a second direction crossing the first direction.

[0053] Note 20. The vibration device according to Note 13,

[0054] wherein each of the plurality of vibration generation portions is longer in a first direction, and has a linear shape spaced apart from an adjacent vibration generation portion in a second direction crossing the first direction, and

[0055] wherein each of the plurality of first power supply electrodes provided at the lower vibration structure is provided at the plurality of vibration generation portions to be spaced apart from each other.

[0056] Note 21. The vibration device according to Note 20, wherein the plurality of vibration generation portions are each provided at an intersection portion between the plurality of first power supply electrodes and the plurality of second power supply electrodes, and are spaced apart from each other in a first direction and a second direction intersecting the first direction.

[0057] Note 22. The vibration device according to Note 6, wherein each of the plurality of vibration generation portions includes:

[0058] a vibration portion including a piezoelectric material;

[0059] a first electrode layer provided at a first surface of the vibration portion; and

[0060] a second electrode layer provided at a second surface of the vibration portion.

[0061] Note 23. The vibration device according to Note 22, wherein a polarization direction of the vibration portion provided in the first vibration structure is the same as or opposite to a polarization direction of the vibration portion provided in the second vibration structure.

[0062] Note 24. The vibration device according to Note 22, wherein the vibration portion is a ceramic-based material configured to generate relatively high vibrations, or a piezoelectric ceramic configured to have a perovskite-based crystal structure.

[0063] Note 25. The vibration device according to Note 22, wherein the vibration portion has a piezoelectric strain coefficient of 1000 pC / N or more in a thickness direction of the vibration device.

[0064] Note 26. The vibration device according to Note 13, wherein each of the plurality of vibration generation portions includes:

[0065] a vibration portion including a piezoelectric material;

[0066] a first electrode layer provided at a first surface of the vibration portion; and

[0067] a second electrode layer provided at a second surface of the vibration portion,

[0068] wherein each of the plurality of first power supply electrodes is electrically connected to the first electrode layer of each of the plurality of vibration generation portions through an anisotropic conductive film or a conductive material included in an adhesive layer, and

[0069] wherein each of the plurality of second power supply electrodes is electrically connected to the second electrode layer of each of the plurality of vibration generation portions through an anisotropic conductive film or a conductive material included in the adhesive layer.

[0070] Paragraph 27. The vibration device according to Paragraph 22, wherein the vibration portion of the vibration generation portion includes a plurality of inorganic material portions and a plurality of flexible portions alternately and repeatedly arranged in the first direction or the second direction of the vibration device.

[0071] Paragraph 28. The vibration device according to Paragraph 27, wherein the modulus and viscoelasticity of the plurality of flexible portions are lower than the modulus and viscoelasticity of the plurality of inorganic material portions.

[0072] Paragraph 29. The vibration device according to Paragraph 22, wherein the vibration portion of the lower vibration structure and the vibration portion of the upper vibration structure vibrate in the same direction.

[0073] Paragraph 30. The vibration device according to Paragraph 22, wherein, in the lower vibration structure,

[0074] the first surface of the vibration portion has a tilted surface structure tilted from both sides toward the center line, and

[0075] the second surface of the vibration portion has a flat surface structure.

[0076] Paragraph 31. The vibration device according to Paragraph 30, wherein, in the lower vibration structure,

[0077] the distance between the first surface and the second surface of the vibration portion gradually decreases in the direction from both sides toward the center line.

[0078] Paragraph 32. The vibration device according to Paragraph 1, wherein each of the lower vibration structure and the upper vibration structure includes:

[0079] a first base member;

[0080] a second base member overlapping the first base member; and

[0081] a vibration generation portion provided between the first base member and the second base member.

[0082] Paragraph 33. The vibration device according to Paragraph 32, wherein the vibration generation portion of each of the lower vibration structure and the upper vibration structure includes:

[0083] a plurality of inorganic material portions including a piezoelectric material; and

[0084] a flexible portion between the plurality of inorganic material portions.

[0085] Clause 34. The vibration device according to Clause 33, wherein each of the plurality of inorganic material portions provided at the upper vibration structure overlaps each of the plurality of inorganic material portions provided at the lower vibration structure.

[0086] Clause 35. The vibration device according to Clause 33, wherein the flexible portion includes one or more of an organic material, an organic polymer, an organic piezoelectric material, and an organic non-piezoelectric material.

[0087] Clause 36. The vibration device according to Clause 33, wherein the vibration generation portion of each of the lower vibration structure and the upper vibration structure includes a 2-2 type composite structure or a 1-3 type composite structure.

[0088] Clause 37. The vibration device according to Clause 1,

[0089] wherein the lower vibration structure includes a first region and a second region, and

[0090] wherein the upper vibration structure includes:

[0091] a first upper vibration structure positioned on the first region of the lower vibration structure; and

[0092] a second upper vibration structure positioned on the second region of the lower vibration structure.

[0093] Clause 38. The vibration device according to Clause 37, wherein the sound wave generated from each of the lower vibration structure, the first upper vibration structure, and the second upper vibration structure is one or more of an audible frequency, an ultrasonic wave of an inaudible frequency band, and an ultrasonic wave of an inaudible frequency band including the audible frequency.

[0094] Clause 39. The vibration device according to Clause 37,

[0095] wherein the sound wave generated from the lower vibration structure is an ultrasonic wave of an inaudible frequency band,

[0096] wherein the sound wave generated from the first upper vibration structure is an ultrasonic wave of an inaudible frequency band including an audible frequency, and

[0097] wherein the sound wave generated from the second upper vibration structure is an ultrasonic wave of an inaudible frequency band including the audible frequency, which is the same as or different from the sound wave generated from the first upper vibration structure.

[0098] Clause 40. The vibration device according to Clause 37, wherein each of the lower vibration structure, the first upper vibration structure, and the second upper vibration structure includes:

[0099] a first base member;

[0100] a second base member overlapping the first base member; and

[0101] at least one vibration generating portion provided between the first base member and the second base member.

[0102] Paragraph 41. The vibration device according to Paragraph 40, wherein the at least one vibration generating portion provided at each of the first upper vibration structure and the second upper vibration structure overlaps the at least one vibration generating portion provided at the lower vibration structure.

[0103] Paragraph 42. The vibration device according to Paragraph 1, further comprising an intermediate vibration structure provided between the lower vibration structure and the upper vibration structure.

[0104] Paragraph 43. The vibration device according to Paragraph 42, wherein each of the lower vibration structure, the intermediate vibration structure, and the upper vibration structure has a circular shape or an elliptical shape.

[0105] Paragraph 44. The vibration device according to Paragraph 43,

[0106] wherein the intermediate vibration structure generates sound waves on a peripheral portion of the lower vibration structure, and

[0107] wherein the upper vibration structure generates sound waves on a peripheral portion of the intermediate vibration structure.

[0108] Paragraph 45. The vibration device according to Paragraph 44, wherein the sound waves generated from each of the lower vibration structure, the intermediate vibration structure, and the upper vibration structure are one or more of audible frequencies, ultrasonic waves of an inaudible frequency band, and ultrasonic waves including an inaudible frequency band of the audible frequencies.

[0109] Paragraph 46. The vibration device according to Paragraph 44, wherein each of the lower vibration structure, the intermediate vibration structure, and the upper vibration structure comprises:

[0110] a first base member;

[0111] a second base member overlapping the first base member; and

[0112] a vibration generating portion provided between the first base member and the second base member.

[0113] Paragraph 47. The vibration device according to Paragraph 1,

[0114] wherein the lower vibration structure comprises:

[0115] a first base member;

[0116] a second base member overlapping the first base member; and

[0117] a plurality of vibration generating portions provided between the first base member and the second base member, and

[0118] wherein the upper vibration structure includes:

[0119] a first base member;

[0120] a second base member overlapping the first base member; and

[0121] a pair of vibration generating portions provided between the first base member and the second base member, the pair of vibration generating portions including an inclined surface.

[0122] Paragraph 48. The vibration device according to Paragraph 47, wherein each of the plurality of vibration generating portions and the pair of vibration generating portions includes:

[0123] a vibration portion including a piezoelectric material;

[0124] a first electrode layer provided at a first surface of the vibration portion; and

[0125] a second electrode layer provided at a second surface of the vibration portion.

[0126] Paragraph 49. The vibration device according to Paragraph 48, wherein the vibration portion of each of the pair of vibration generating portions overlaps the vibration portion of each vibration generating portion provided at a peripheral portion of the plurality of vibration generating portions.

[0127] Paragraph 50. The vibration device according to Paragraph 48, wherein in each of the pair of vibration generating portions,

[0128] the first surface of the vibration portion has an inclined surface structure inclined from both ends of the upper vibration structure toward a center line, and

[0129] the second surface of the vibration portion has a planar structure.

[0130] Paragraph 51. The vibration device according to Paragraph 50, wherein the inclined surface structure includes a first inclined surface and a second inclined surface, and

[0131] a first included angle between the first inclined surface and the second surface is an acute angle, and a second included angle between the second inclined surface and the second surface is an acute angle.

[0132] Paragraph 52. The vibration device according to Paragraph 51, wherein the first included angle and the second included angle are in a range of 10 degrees to 75 degrees.

[0133] Paragraph 53. The vibration device according to Paragraph 48, wherein, in each of the pair of vibration generation portions,

[0134] the first surface of the vibration portion has a tilted surface structure that is tilted from one end of the upper vibration structure toward a center line with respect to a first direction of the vibration device, and

[0135] the second surface of the vibration portion has a planar structure.

[0136] Paragraph 54. The vibration device according to Paragraph 48, wherein the vibration portion of each of the pair of vibration generation portions has an L-shaped planar structure, and overlaps with a peripheral portion of the lower vibration structure.

[0137] Paragraph 55. The vibration device according to Paragraph 1, further comprising:

[0138] a vibration drive circuit electrically connected to each of the lower vibration structure and the upper vibration structure through a flexible cable, and providing a first vibration drive signal to the first vibration structure and a second vibration drive signal to the second vibration structure.

[0139] Paragraph 56. An electronic device, comprising:

[0140] a vibration member;

[0141] a vibration generation device at the vibration member; and

[0142] a connection member between the vibration member and the vibration generation device,

[0143] wherein the vibration generation device includes the vibration device according to any one of Paragraphs 1 to 55.

[0144] Paragraph 57. The electronic device according to Paragraph 56, wherein the vibration member is one or more of: a display panel including a plurality of pixels configured to display an image, a screen panel that projects an image from a display device, an illumination panel, a vibration plate, wood, plastic, glass, cloth, metal, a vehicle interior material, a vehicle glazing, a building indoor ceiling, a building glazing, an aircraft interior material, and an aircraft glazing.

[0145] Paragraph 58. The electronic device according to Paragraph 57, wherein the connection member further includes a hollow portion between the display panel and the vibration generation device for providing an air gap between the display panel and the vibration generation device.

[0146] Clause 59. The electronic device of clause 56,

[0147] wherein the vibration member is a display panel including a plurality of pixels configured to display an image,

[0148] wherein the display panel includes a first rear region and a second rear region, and

[0149] wherein the vibration generation device includes:

[0150] a first vibration generation apparatus disposed at the first rear region of the display panel; and

[0151] a second vibration generation apparatus disposed at the second rear region of the display panel.

[0152] Clause 60. The electronic device of clause 59, further comprising a plate between the display panel and the vibration generation device.

[0153] Clause 61. The electronic device of clause 59, further comprising:

[0154] a support member disposed at a rear surface of the display panel; and

[0155] a partition disposed between the rear surface of the display panel and the support member and between the first rear region and the second rear region of the display panel.

[0156] Clause 62. The electronic device of clause 60, wherein the plate includes a plurality of open portions configured to have a predetermined size and a predetermined interval.

[0157] Clause 63. A vehicle comprising:

[0158] a vehicle interior material covering a vehicle structure; and

[0159] a sound generation device disposed at the vehicle interior material,

[0160] wherein the sound generation device includes the vibration device according to any one of clauses 1 to 55, and

[0161] wherein the vehicle interior material vibrates according to vibration of the sound generation device to output a sound.

[0162] Clause 64. The vehicle of clause 63, wherein the vehicle structure includes a main frame, a side frame, a door frame, a glass window, and a seat frame.

[0163] Paragraph 65. The vehicle of Paragraph 63, wherein the vehicle interior material comprises one or more of plastic, fiber, leather, wood, cloth, metal, and glass.

[0164] Paragraph 66. The vehicle of Paragraph 63, wherein the sound producing device is disposed between the vehicle structure and the vehicle interior material or at the vehicle interior material.

[0165] Paragraph 67. The vehicle of Paragraph 66,

[0166] wherein the vehicle interior material comprises at least one or more of an instrument panel, a pillar interior material, a roof interior material, a door interior material, a seat interior material, a handle interior material, a floor interior material, and a rear package interior material, and

[0167] wherein the sound producing device vibrates at least one or more of the instrument panel, the pillar interior material, the roof interior material, the door interior material, the seat interior material, the handle interior material, the floor interior material, and the rear package interior material.

[0168] Paragraph 68. The vehicle of Paragraph 63, further comprising:

[0169] a glass window; and

[0170] a transparent sound producing device at the glass window.

[0171] Paragraph 69. The vehicle of Paragraph 68,

[0172] wherein the glass window comprises at least one or more of a front glass window, a side glass window, a rear glass window, and a roof glass window, and

[0173] wherein the transparent sound producing device vibrates at least one or more of the front glass window, the side glass window, the rear glass window, and the roof glass window. BRIEF DESCRIPTION OF DRAWINGS

[0174] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure, and together with the description serve to explain the principles of the present disclosure.

[0175] Figure 1 A vibration device according to an embodiment of the present disclosure is shown.

[0176] Figure 2 A vibration device is shown Figure 1 A sound output of the vibration device shown.

[0177] Figure 3 is a cross-sectional view taken along the line I-I' shown in Figure 1

[0178] Figure 4 is a plan view showing a first vibration structure according to an embodiment of the present disclosure shown in Figure 3

[0179] Figure 5 is a plan view showing a second vibration structure according to an embodiment of the present disclosure shown in Figure 3

[0180] Figure 6 is a plan view showing a first vibration structure according to another embodiment of the present disclosure shown in Figure 1 and Figure 3

[0181] Figure 7 is a plan view showing a second vibration structure according to another embodiment of the present disclosure shown in Figure 1 and Figure 3

[0182] Figure 8 is a plan view showing a first vibration structure according to another embodiment of the present disclosure shown in Figure 1 and Figure 3

[0183] Figure 9 is a plan view showing a second vibration structure according to another embodiment of the present disclosure shown in Figure 1 and Figure 3

[0184] Figure 10 is a plan view showing a first vibration structure according to another embodiment of the present disclosure shown in Figure 1 and Figure 3

[0185] Figure 11 is a plan view showing a second vibration structure according to another embodiment of the present disclosure shown in Figure 1 and Figure 3

[0186] Figure 12 shows a vibration drive circuit of a vibration device according to an embodiment of the present disclosure.

[0187] Figure 13 shows a vibration drive circuit of a vibration device according to another embodiment of the present disclosure.

[0188] Figure 14 shows a vibration drive circuit of a vibration device according to another embodiment of the present disclosure.​​​​​​​​​

[0189] Figure 15 A vibration drive circuit of a vibration device according to another embodiment of the present disclosure is shown.

[0190] Figure 16 is another cross-sectional view taken along line I-I' shown in Figure 1

[0191] Figure 17 is shown. Figure 16

[0192] Figure 18 is a plan view showing a first vibration structure shown in Figure 16

[0193] Figure 19 is a plan view showing a second vibration structure shown in Figure 16

[0194] Figure 20 is a plan view showing a first vibration structure according to another embodiment of the present disclosure shown in Figure 18

[0195] Figure 21 is a plan view showing a second vibration structure according to another embodiment of the present disclosure shown in Figure 19

[0196] Figure 22 is shown. Figure 16

[0197] Figure 23 is shown.

[0198] Figure 24 is shown. Figure 23

[0199] Figure 25 is shown.

[0200] Figure 26 is a cross-sectional view taken along line II-II' shown in Figure 15

[0201] is shown. Figure 27 Figure 25 Figure 26 is shown.

[0202] Figure 28 is shown. Figure 25 Figure 26 ​​​​​​​​​​​the second vibration structure shown in FIG. 2.

[0203] Figure 29 the third vibration structure shown in FIG. 3 is shown. Figure 25 and Figure 26 the third vibration structure shown in FIG. 3 is shown.

[0204] Figure 30 the third vibration structure shown in FIG. 3 is shown. Figure 25 the sound output of the vibration device shown in FIG. 2 is shown.

[0205] Figure 31 a vibration device according to another embodiment of the present disclosure is shown.

[0206] Figure 32 is a cross-sectional view taken along line III-III' in Figure 31

[0207] Figure 33 is a plan view showing the second vibration structure shown in FIG. 2. Figure 31 and Figure 32

[0208] Figure 34 Figure 32 Figure 33

[0209] Figure 35 Figure 31 the sound output of the vibration device shown in FIG. 2 is shown.

[0210] Figure 36 is another cross-sectional view taken along line III-III' in Figure 31

[0211] Figure 37 is a plan view showing the second vibration structure shown in FIG. 2. Figure 31 and Figure 36

[0212] Figure 38 Figure 36 Figure 37

[0213] Figure 39 Figure 31 the sound output of the vibration device shown in FIG. 2 is shown.

[0214] Figure 40 a second vibration structure according to another embodiment of the present disclosure shown in FIG. 4 is shown. Figure 31

[0215] a second vibration structure according to another embodiment of the present disclosure shown in FIG. 4 is shown. Figure 41 Figure 31 a second vibration structure according to another embodiment of the present disclosure shown in FIG. 4 is shown.​​​​​​​​​​​​​

[0216] Figure 42 It shows according to Figure 31 The second vibration structure of another embodiment of this disclosure is shown.

[0217] Figure 43 An apparatus according to an embodiment of the present disclosure is shown.

[0218] Figure 44 It is along Figure 43 The cross-sectional view shown is taken by line IV-IV'.

[0219] Figure 45 It is along Figure 43 Another cross-sectional view taken by line IV-IV' shown.

[0220] Figure 46 Another device according to an embodiment of this disclosure is shown.

[0221] Figure 47 A vehicle according to an embodiment of the present disclosure is shown.

[0222] Figure 48 A vehicle according to an embodiment of the present disclosure is shown.

[0223] Figure 49 It shows Figure 47 and Figure 48 The arrangement structure of the vehicle vibration equipment is shown.

[0224] Throughout the accompanying drawings and detailed description, unless otherwise stated, the same reference numerals should be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative dimensions and depictions of these elements may be exaggerated. Detailed Implementation

[0225] Reference will now be made in detail to embodiments of this disclosure, examples of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations relevant to this document will be omitted where such obscuration of the essential points of the inventive concept is deemed unnecessary. The progression of the described processing steps and / or operations is exemplary; however, the order of steps and / or operations is not limited to that set forth herein and can be varied as is known in the art, except for steps and / or operations that must occur in a specific order. The same reference numerals denote the same elements throughout the text. The names of the various elements used in the following description are chosen solely for ease of writing and may therefore differ from those used in actual products.

[0226] The advantages and features of the present disclosure and a method of achieving the same will be clarified by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be implemented in various forms and should not be considered limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that the disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Further, the present disclosure is defined only by the scope of the claims.

[0227] The shapes, sizes, ratios, angles, and numbers disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples, and thus the present disclosure is not limited to the illustrated details. The same reference numbers in the drawings represent the same elements. In the following description of the embodiments, detailed descriptions of functionally known or configured elements will be omitted when it is determined that such detailed description will unnecessarily obscure the gist of the present disclosure. When "include", "have", and "comprise" are used in the present specification, another part can be added unless "only" is used. Unless otherwise indicated, a singular form of a term can include a plural form.

[0228] In explaining an element, the element is explained to include an error or a tolerance range, although there is no explicit description of the error or the tolerance range.

[0229] In describing a positional relationship, for example, when a positional relationship between two components is described as, for example, "on", "above", "below", and "near", unless a more restrictive term such as "only" or "directly" is used, one or more other components can be disposed between the two components.

[0230] In describing a temporal relationship, for example, when a temporal sequence is described as, for example, "after", "subsequently", "next", and "before", unless a more restrictive term such as "only", "immediately", or "directly" is used, a discontinuous case can be included.

[0231] It should be understood that although the terms "first", "second", and the like can be used herein to describe various elements, such elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0232] In describing elements of the present disclosure, the terms "first", "second", "A", "B", "(a)", "(b)" etc. can be used. These terms are intended to distinguish between corresponding elements with one another, and the basis, order or number of the corresponding elements should not be limited by these terms. The expression that an element is "connected", "coupled", or "adhered" to another element or layer means that the element or layer can be directly connected or adhered to another element or layer, and can also be indirectly connected or adhered to another element or layer with one or more intervening elements or layers interposed therebetween, unless otherwise specified.

[0233] The term "at least one" should be understood to include any and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of a first item, a second item, and a third item" indicates all of the possible combinations of two or more of the first item, the second item, and the third item, as well as the first item, the second item, or the third item alone.

[0234] In the present disclosure, a device can include a display device such as an organic light emitting display (OLED) module or a liquid crystal module (LCM) including a display panel and a driver for driving the display panel. In addition, the device can include a package device (or a package apparatus) or a package electronic device such as a notebook computer, a TV, a computer monitor, a device apparatus including an automobile apparatus or other type of apparatus for a vehicle, or a mobile electronic device such as a smart phone or an electronic pad, which is a finished product (or an end product) including the LCM or the OLED module.

[0235] Accordingly, in the present disclosure, examples of the device can include the display device itself such as the LCM or the OLED module, and the package device as the end consumer device or the application product including the LCM or the OLED module.

[0236] In some embodiments, the LCM or the OLED module including the display panel and the driver can be referred to as a display device, and the electronic device as the end product including the LCM or the OLED module can be referred to as a package device. For example, the display device can include a display panel such as an LCD or an OLED, and a source printed circuit board (PCB) as a controller for driving the display panel. The package device can further include a package PCB which is a package controller electrically connected to the source PCB to overall control the package device.

[0237] The display panel applied to the embodiments of the disclosure can use all types of display panels such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and an electroluminescent display panel, but the embodiments of the disclosure are not limited thereto. For example, the display panel can be a display panel capable of generating sound by being vibrated by the vibration device according to the embodiments of the disclosure. The display panel applied to the display device according to the embodiments of the disclosure is not limited to the shape or size of the display panel.

[0238] For example, when the display panel is a liquid crystal display panel, the display panel can include a plurality of gate lines, a plurality of data lines, and a plurality of pixels respectively disposed in a plurality of pixel regions defined by the intersection points of the gate lines and the data lines. In addition, the display panel can include an array substrate including a thin film transistor (TFT) which is a switching element for adjusting the light transmittance of each of the plurality of pixels, an upper substrate including a color filter and / or a black matrix, and a liquid crystal layer between the array substrate and the upper substrate.

[0239] When the display panel is an organic light emitting display panel (OLED), the display panel can include a plurality of gate lines, a plurality of data lines, and a plurality of pixels respectively disposed in a plurality of pixel regions defined by the intersection points of the gate lines and the data lines. In addition, the display panel can include an array substrate including a TFT which is an element for selectively applying a voltage to each of the pixels, an organic light emitting device layer on the array substrate, and an encapsulation substrate disposed at the array substrate to cover the organic light emitting device layer. The encapsulation substrate can protect the TFT and the organic light emitting device layer from external impact, and can prevent moisture or oxygen from penetrating into the organic light emitting device layer. In addition, the layer disposed on the array substrate can include an inorganic light emitting layer, for example, a nano material layer, a quantum dot, a light emitting layer, etc. As another example, the layer disposed on the array substrate can include a micro light emitting diode.

[0240] The display panel can further include a backing such as a metal plate attached to the display panel. However, the embodiments of the disclosure are not limited to the metal plate, and the display panel can include another structure.

[0241] In the disclosure, the device including the vibration device can be applied to a vehicle as a user interface device, for example, a center control panel for a car. For example, the device can be disposed between occupants sitting on two front seats so as to transmit the vibration of the display panel to the inside of the vehicle. Accordingly, the audio experience in the vehicle is improved compared to the case where the speaker is disposed inside the vehicle.

[0242] The vibration device and the device including the same according to the embodiments of the disclosure can vibrate a vibration object (or a vibration member) to generate or output a sound according to vibration of the vibration object. For example, the vibration object (or a vibration structure) can be a display panel including a pixel displaying an image, a screen panel projecting an image from a display device, an illumination panel, a vibration plate, wood, plastic, glass, cloth, paper, a vehicle interior material, a vehicle glass window, a building indoor ceiling, a building glass window, a building interior material, an aircraft interior material, and an aircraft glass window, etc., but the embodiments of the disclosure are not limited thereto. For example, the illumination panel can be a light emitting diode illumination panel (or device), an organic light emitting illumination panel (or device), an inorganic light emitting illumination panel (or device), etc., but the embodiments of the disclosure are not limited thereto. For example, the vibration plate can include a metal material, or can include a single non-metal material or a composite non-metal material of one or more of wood, plastic, glass, cloth, paper, and leather, but the embodiments of the disclosure are not limited thereto.

[0243] Features of various embodiments of the disclosure can be partially or wholly coupled or combined with each other, and can interoperate and be technically driven in various ways as can be fully understood by those skilled in the art. The embodiments of the disclosure can be executed independently of each other, or can be executed together in a dependent relationship.

[0244] Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings. For the purpose of description, the ratio of each element shown in the drawings is different from the actual ratio, and thus is not limited to the ratio shown in the drawings.

[0245] Figure 1 A vibration device according to an embodiment of the disclosure is illustrated.

[0246] Referring to Figure 1 The vibration device according to the embodiments of the disclosure can include a first vibration structure 110 and a second vibration structure 130 stacked on the first vibration structure 110.

[0247] The first vibration structure 110 can be a lower vibration structure, a lower vibration generator, a lower vibration module, a lower actuator, a lower exciter, a lower vibration film, a lower film actuator, a lower sound generator, a first vibration generator, a first vibration module, a first actuator, a first exciter, a first vibration film, a first film actuator, a first film exciter, or a first sound generator, but the embodiments of the disclosure are not limited thereto.

[0248] The first vibration structure 110 can include a piezoelectric material having a piezoelectric property. When the piezoelectric material alternately repeats contraction and expansion by a piezoelectric effect of the piezoelectric material based on the first vibration driving signal (or the first sound signal), the first vibration structure 110 can be displaced or vibrated. For example, the first vibration structure 110 can output or generate the first sound wave based on the displacement or vibration of the piezoelectric material. For example, the vibration of the first vibration structure 110 can be used as a vibration of the haptic feedback in response to the user touch.

[0249] The second vibration structure 130 can be an upper vibration structure, an upper vibration generator, an upper vibration module, an upper actuator, an upper exciter, an upper vibration membrane, an upper membrane actuator, an upper membrane exciter, an upper sound generator, a second vibration generator, a second vibration module, a second actuator, a second exciter, a second vibration membrane, a second membrane actuator, a second membrane exciter, or a second sound generator, but embodiments of the present disclosure are not limited thereto.

[0250] The second vibration structure 130 can include a piezoelectric material having a piezoelectric property. When the piezoelectric material alternately repeats contraction and expansion by a piezoelectric effect of the piezoelectric material based on the second vibration driving signal (or the second sound signal), the second vibration structure 130 can be displaced or vibrated. For example, the second vibration structure 130 can output or generate the second sound wave based on the displacement or vibration of the piezoelectric material. For example, the vibration of the second vibration structure 130 can be used as a vibration of the haptic feedback in response to the user touch.

[0251] The second vibration structure 130 can be stacked on a front surface (or an upper surface) of the first vibration structure 110. For example, the second vibration structure 130 can be coupled or connected to the front surface of the first vibration structure 110 through the adhesive member 120. Accordingly, the first vibration structure 110 and the second vibration structure 130 can be overlapped or can be stacked with each other.

[0252] The first vibration structure 110 and the second vibration structure 130 can be overlapped or can be stacked to be displaced (or driven or vibrated) in the same direction. For example, in a state in which the first vibration structure 110 and the second vibration structure 130 are overlapped or stacked with each other, the first vibration structure 110 and the second vibration structure 130 can contract or expand in the same driving direction (or displacement direction or vibration direction) based on the vibration driving signal, and thus, a displacement amount (or a bending force or a flexing force) or an amplitude displacement can be increased or maximized. Accordingly, a sound pressure level characteristic of a sound generated based on the displacement of each of the first vibration structure 110 and the second vibration structure 130 and a sound characteristic of a mid-low tone sound band can be enhanced. For example, the mid-low tone sound band can be 200 Hz to 1 kHz, but embodiments of the present disclosure are not limited thereto.

[0253] The adhesive member 120 according to an embodiment of the disclosure can be disposed or inserted between the first vibration structure 110 and the second vibration structure 130. The adhesive member 120 can be a connection member, a coupling member, or an integrated member, but embodiments of the disclosure are not limited thereto.

[0254] According to an embodiment of the disclosure, the adhesive member 120 can include a material including an adhesive having good adhesive adhesion or bonding force with respect to each of the first vibration structure 110 and the second vibration structure 130. For example, the adhesive member 120 can include a UV (ultraviolet) curing adhesive or a thermal curing adhesive. For example, the adhesive of the adhesive member 120 can have a Shore D hardness of 10 7 Pa or more, so that vibration loss (or vibration attenuation) caused by displacement interference between the first vibration structure 110 and the second vibration structure 130 is minimized. For example, the adhesive of the adhesive member 120 can have a Shore D hardness of 50 or more.

[0255] The first vibration structure 110 and the second vibration structure 130 according to an embodiment of the disclosure can be integrated into one structure (or part) by using a lamination process of the adhesive member 120. For example, the first vibration structure 110 and the second vibration structure 130 can be integrated into one structure by using a lamination process of a roll.

[0256] The first vibration structure 110 and the second vibration structure 130 can output sound waves having different frequencies, and thus the vibration device can output or implement sound based on direction.

[0257] According to an embodiment of the disclosure, any one of the first vibration structure 110 and the second vibration structure 130 overlapped or stacked with each other can output a first sound wave, and the other of the first vibration structure 110 and the second vibration structure 130 overlapped or stacked with each other can output a second sound wave different from the first sound wave. For example, the first vibration structure 110 can output a first sound wave, and the second vibration structure 110 can output a second sound wave.

[0258] Each of the first sound wave and the second sound wave can be any one or more of an audible frequency, an ultrasonic wave of an inaudible frequency band having no audible frequency, and an ultrasonic wave including an inaudible frequency band of an audible frequency. For example, the ultrasonic wave (or hybrid sound wave) including the audible frequency can be an ultrasonic wave mixed with the audible frequency or a hybrid frequency. The ultrasonic wave of the inaudible frequency band can be a carrier wave or a carrier frequency.

[0259] According to an embodiment of the disclosure, the first wave can be an ultrasonic wave of an inaudible band without an audible frequency, and the second sound wave can be an ultrasonic wave of an audible band. However, embodiments of the disclosure are not limited thereto. For example, the first wave can allow the second wave to be concentrated or focused in a specific direction to assign directionality to the second sound wave or limit a directional angle of the second sound, and thus, a user privacy protection function that allows a user not to listen to sound in a peripheral area (or an inaudible area) other than an area in a specific direction (or an audible area) can be implemented. Accordingly, the vibration device can output sound having directionality or a directional angle based on the first wave and the second wave.

[0260] As another embodiment of the disclosure, the first wave can be an ultrasonic wave of an inaudible band without an audible frequency, and the second sound wave can be an ultrasonic wave mixed with an audible frequency. However, embodiments of the disclosure are not limited thereto. For example, the ultrasonic wave including the audible frequency can be a mixed frequency (or a mixed sound wave), and the ultrasonic wave of the inaudible band can be a carrier wave or a carrier frequency. For example, when the first sound wave is an ultrasonic wave and the second sound wave is a mixed frequency, a beat phenomenon formed by an envelope of an audible frequency corresponding to a difference between the first sound wave and the second sound wave can occur in an overlapping area between the first sound wave and the second sound wave having a different frequency (or a resonance frequency), and based on the beat phenomenon, the overlapping area between the first sound wave and the second sound wave can be an audible area that enables a user to listen to sound, and a non-overlapping area between the first sound wave and the second sound wave can be an inaudible area that does not enable the user to listen to sound. Accordingly, the vibration device can output sound having directionality or a directional angle based on the first wave and the second wave.

[0261] According to an embodiment of the disclosure, at least one or more of the first vibration structure 110 and the second vibration structure 130 can simultaneously output the first sound wave and the second sound wave. For example, at least one or more of the first vibration structure 110 and the second vibration structure 130 can include a first vibration area (or a first sound wave generation area) that generates the first sound wave and a second vibration area (or a second sound wave generation area) that generates the second sound wave. The second vibration area can have a size of 6 cm or less in order to generate a resonance frequency of 30 kHz or more, but embodiments of the disclosure are not limited thereto. In at least one or more of the first vibration structure 110 and the second vibration structure 130, the second vibration area can not be fixed and can vary based on a sound wave output direction.

[0262] In the vibration device according to an embodiment of the disclosure, as Figure 2As shown, the first vibration structure 110 and the second vibration structure 130 can be overlapped or stacked with each other, and based on the first sound wave SW1 generated from the first vibration structure 110 and the second sound wave SW2 generated from the second vibration structure 130, a sound having an enhanced sound pressure level characteristic of a mid-low pitch sound band can be output, or a sound having directivity or a directivity angle can be output. Further, the vibration device according to the embodiment of the disclosure can change a position or a size of an overlapping area between the first sound wave SW1 generated from the first vibration structure 110 and the second sound wave SW2 generated from the second vibration structure 130, and thus, a directivity direction of the sound and / or a directivity angle of the sound can be changed, and a sound having a minimum directivity angle (or directivity) can be output.

[0263] Figure 3 is a cross-sectional view taken along a line I-I' shown in Figure 1 Figure 4 is a plan view showing a first vibration structure according to an embodiment of the disclosure shown in Figure 3 Figure 5 Figure 3

[0264] Referring to Figure 1 , Figure 3 and Figure 4 , the first vibration structure 110 according to the embodiment of the disclosure can include a first base member 111, a second base member 112, and a plurality of vibration generation portions 113.

[0265] The first base member 111 and the second base member 112 can be disposed to be overlapped with each other. For example, the first base member 111 can be disposed or aligned on the second base member 112.

[0266] Each of the first base member 111 and the second base member 112 according to the embodiment of the disclosure can be formed of a plastic material, a fiber material, or a wood material, but the embodiment of the disclosure is not limited thereto. For example, the first base member 111 and the second base member 112 can be formed of the same or different materials of the plastic material, the fiber material, and the wood material. For example, each of the first base member 111 and the second base member 112 can be a polyimide (PI) film or a polyethylene terephthalate (PET) film, but the embodiment of the disclosure is not limited thereto. The first base member 111 can be a first protection member. The second base member 112 can be a second protection member.

[0267] ​​​​Each of the plurality of vibration generation parts (or first vibration generation parts) 113 can be disposed or inserted between the first base member 111 and the second base member 112. For example, each of the plurality of vibration generation parts 113 can be implemented in a linear shape extending long in a first direction X. For example, the plurality of second vibration generation parts 113 can be spaced apart from each other in a second direction Y crossing the first direction X. For example, the first direction X can be a width direction of the vibration device, and the second direction Y can be a length direction of the vibration device crossing the first direction X, but embodiments of the present disclosure are not limited thereto. For example, the first direction X can be a length direction of the vibration device, and the second direction Y can be a width direction of the vibration device.

[0268] Each of the plurality of vibration generation parts 113 can include a piezoelectric material (or a piezoelectric element) having a piezoelectric property (or a piezoelectric effect). For example, the piezoelectric material can have a property in which, in the case where a pressure or a twist is applied to a crystal structure by an external force, a potential difference occurs due to dielectric polarization caused by a change in the relative positions of positive (+) ions and negative (-) ions, and vibration is generated by an electric field based on a voltage applied thereto.

[0269] Each of the plurality of vibration generation parts 113 according to an embodiment of the present disclosure can include a vibration part 113a including a piezoelectric material, a first electrode layer 113b disposed at a first surface of the vibration part 113a, and a second electrode layer 113c disposed at a second surface of the vibration part 113a opposite or different from the first surface.

[0270] The vibration part (or first vibration part) 113a can be referred to as a vibration layer, a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a piezoelectric vibration part, a piezoelectric material part, an electroactive part, an inorganic material layer, or an inorganic material part, etc., but embodiments of the present disclosure are not limited thereto.

[0271] The vibration part 113a can be configured as a ceramic-based material for generating relatively high vibration, or can be configured as a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure can have a piezoelectric effect and a converse piezoelectric effect, and can be a plate-like structure having a direction. The peroviskite crystal structure can be represented by a chemical formula "ABO3". In the chemical formula, "A" can include a divalent metal element, and "B" can include a tetravalent metal element. As one embodiment of the present disclosure, in the chemical formula "ABO3", "A" and "B" can be cations, and "O" can be an anion. For example, the peroviskite crystal structure can include at least one or more of PbTiO3, PbZrO3, PbZrTiO3, BaTiO3, and SrTiO3, but embodiments of the present disclosure are not limited thereto.

[0272] The vibration portion 113a according to the embodiment of the present disclosure can include one or more of lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb), but embodiments of the present disclosure are not limited thereto.

[0273] The vibration portion 113a according to another embodiment of the present disclosure can include a lead zirconate titanate (PZT)-based material including lead (Pb), zirconium (Zr), and titanium (Ti), or can include a lead zirconate nickelate (PZNN)-based material including lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb), but embodiments of the present disclosure are not limited thereto. In addition, the vibration portion 113a can include at least one or more of CaTiO3, BaTiO3, and SrTiO3, which do not contain Pb, but embodiments of the present disclosure are not limited thereto.

[0274] The vibration portion 113a according to another embodiment of the present disclosure can have a piezoelectric strain coefficient "d 33 " of 1000 pC / N or more in the thickness direction Z. By having a high piezoelectric strain coefficient "d 33 ", a vibration device that can be applied to a vibration object (or a vibration member) having a large size or that can have sufficient vibration characteristics or piezoelectric characteristics can be provided. For example, the vibration portion 113a can include a PZT-based material (PbZrTiO3) as a main component, and can include a softener dopant material doped into an "A" site (Pb) and a relaxor ferroelectric material doped into a "B" site (ZrTi).

[0275] The softener dopant material can enhance piezoelectric characteristics and dielectric characteristics of the vibration portion 113a, and for example, can increase the piezoelectric strain coefficient "d 33 " of the vibration portion 113a. When the softener dopant material includes a monovalent element "+1", the inventors have confirmed that the piezoelectric characteristics and the dielectric characteristics are reduced. For example, when the softener dopant material includes potassium (K) and rubidium (Rb), the piezoelectric characteristics and the dielectric characteristics can be reduced. Accordingly, through various experiments, the inventors have recognized that, in order to enhance the piezoelectric characteristics and the dielectric characteristics, the softener dopant material should include a divalent element "+2" to a trivalent element "+3". The softener dopant material according to the embodiment of the present disclosure can include a divalent element "+2" to a trivalent element "+3". A morphotropic phase boundary (MPB) can be achieved by adding the softener dopant material to the PZT-based material (PbZrTiO3), and thus, the piezoelectric characteristics and the dielectric characteristics can be enhanced. For example, the softener dopant material can include strontium (Sr), barium (Ba), lanthanum (La), neodymium (Nd), calcium (Ca), yttrium (Y), erbium (Er), or ytterbium (Yb). For example, the ion (Sr2+ Ba 2+ La 2+ Nd 3+ Ca 2+ Y 3+ Er 3+ Yb 3+ ) can replace a portion of lead (Pb) in a PZT-based material (PbZrTiO3), and a substitution rate thereof can be about 2 mol% to about 20 mol%. For example, when the substitution rate is less than 2 mol% or greater than 20 mol%, a perovskite crystal structure can be broken, and thus, an electromechanical coupling coefficient "kP" and a piezoelectric deformation coefficient "d 33 " can be reduced. When the softener dopant material is replaced, an MPB can be formed, and the MPB of the piezoelectric properties and the dielectric properties can be high, thereby implementing a vibration device having high piezoelectric properties and high dielectric properties.

[0276] According to embodiments of the present disclosure, a relaxor ferroelectric material doped into a PZT-based material (PbZrTiO3) can enhance the electric deformation properties of the vibration portion 113a. The relaxor ferroelectric material according to embodiments of the present disclosure can include a lead magnesium niobate (PMN)-based material or a lead nickel niobate (PNN)-based material, but embodiments of the present disclosure are not limited thereto. The PMN-based material can include Pb, Mg, and Nb, and for example, can include Pb(Ni,Nb)O3. For example, the relaxor ferroelectric material doped into the PZT-based material (PbZrTiO3) can replace a portion of each of zirconium (Zr) and titanium (Ti) in the PZT-based material (PbZrTiO3), and a substitution rate thereof can be about 5 mol% to about 25 mol%. For example, when the substitution rate is less than 5 mol% or greater than 25 mol%, a perovskite crystal structure can be broken, and thus, an electromechanical coupling coefficient "kP" and a piezoelectric deformation coefficient "d 33 " can be reduced.

[0277] According to embodiments of the present disclosure, the vibration portion 113a can further include a donor material doped into a "B" site (ZrTi) of the PZT-based material (PbZrTiO3) in order to more enhance a piezoelectric coefficient. For example, the donor material doped into the "B" site (ZrTi) can include a tetravalent element "+4" or a hexavalent element "+6". For example, the donor material doped into the "B" site (ZrTi) can include tellurium (Te), germanium (Ge), uranium (U), bismuth (Bi), niobium (Nb), tantalum (Ta), antimony (Sb), or tungsten (W).

[0278] The vibration portion 113a according to embodiments of the present disclosure can be expressed as the following Equation 1.

[0279] [Equation 1]

[0280] (Pb A-B C B )((Mg 1 / 3 Nb 2 / 3 ) a (Ni 1 / 3 Nb 2 / 3 ) b Zr c Ti d )O3

[0281] Here, C can be one of Ca, Sr, and Ba. In addition, a+b+c+d = 1, 0.02 ≤ B ≤ 0.20, 0.80 ≤ A-B ≤ 0.98, 0.05 ≤ a ≤ 0.25, 0.05 ≤ b ≤ 0.25, 0.10 ≤ c ≤ 0.50, and 0.10 ≤ d ≤ 0.50.

[0282] The vibrating portion 113a according to the embodiment of the present disclosure can have a piezoelectric strain coefficient "d 33 " of 1000 pC / N or more in the thickness direction Z, thereby realizing a vibrating device having enhanced vibration characteristics. For example, a vibrating device having enhanced vibration characteristics can be realized in a large-area device (or a vibrating object or a vibrating member).

[0283] The first electrode layer 113b can be disposed at the first surface (or the upper surface) of the vibrating portion 113a. For example, the first electrode layer 113b can be directly electrically connected to the first surface of the vibrating portion 113a. For example, the first electrode layer 113b can be disposed between the vibrating portion 113a and the first base member 111. For example, the first electrode layer 113b can have a single electrode type disposed at the entire first surface of the vibrating portion 113a. For example, the first electrode layer 113b can have the same shape as the vibrating portion 113a, but embodiments of the present disclosure are not limited thereto.

[0284] The first electrode layer 113b according to the embodiment of the present disclosure can be formed of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the transparent conductive material or the semi-transparent conductive material can include indium tin oxide (ITO) or indium zinc oxide (IZO), but embodiments of the present disclosure are not limited thereto. The opaque conductive material can include aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), Mg, and the like, but embodiments of the present disclosure are not limited thereto.

[0285] The second electrode layer 113c can be disposed at the second surface (or rear surface) of the vibration portion 113a and can overlap the first electrode layer 113b. For example, the second electrode layer 113c can be directly electrically connected to the second surface of the vibration portion 113a. For example, the second electrode layer 113c can be disposed between the vibration portion 113a and the second base member 113. For example, the second electrode layer 113c can have a single electrode type disposed at the entire second surface of the vibration portion 113a. For example, the second electrode layer 113c can have the same shape as the vibration portion 113a, but embodiments of the disclosure are not limited thereto.

[0286] The second electrode layer 113c according to an embodiment of the disclosure can be formed of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the second electrode layer 113c can be formed of the same material as the first electrode layer 113b, but embodiments of the disclosure are not limited thereto. As another embodiment of the disclosure, the second electrode layer 113c can be formed of a different material from the first electrode layer 113b.

[0287] The first vibration structure 110 according to an embodiment of the disclosure can further include an adhesive layer 114 disposed between the first base member 111 and the second base member 112 to surround the side surface (or sidewall) of each of the plurality of vibration generation portions 113.

[0288] The adhesive layer 114 can attach the first base member 111 to the second base member 112, each of the plurality of vibration generation portions 113 being located between the first base member 111 and the second base member 112. The adhesive layer 114 can be disposed in a region between the first base member 111 and the second base member 112, except for each of the plurality of vibration generation portions 113.

[0289] The adhesive layer 114 according to an embodiment of the disclosure can include a first adhesive layer 114a disposed at the second surface (or rear surface) of the first base member 111 and a second adhesive layer 114b disposed at the first surface (or upper surface) of the second base member 112. The first adhesive layer 114a and the second adhesive layer 114b can be coupled or bonded to each other between the first base member 111 and the second base member 112, and can be implemented as one adhesive layer. The first adhesive layer 114a or the second adhesive layer 114b can be omitted.

[0290] Each of the first adhesive layer 114a and the second adhesive layer 114b can include an electrically insulating material. For example, the electrically insulating material can have an adhesive property and can include a material capable of compression and decompression. For example, one or more of the first adhesive layer 114a and the second adhesive layer 114b can include an epoxy resin, an acrylic resin, a silicone resin, or a polyurethane resin, but embodiments of the disclosure are not limited thereto.

[0291] The first base member 111 can be coupled or connected to the first surface (or the first electrode layer 113b) of each of the plurality of vibration generation parts 113 by a lamination process using the first adhesive layer 114a. The second base member 112 can be coupled or connected to the second surface (or the second electrode layer 113c) of each of the plurality of vibration generation parts 113 by a lamination process using the second adhesive layer 114b.

[0292] The first vibration structure 110 according to an embodiment of the disclosure can further include a plurality of first power supply electrodes 115 and a plurality of second power supply electrodes 116.

[0293] Each of the plurality of first power supply electrodes 115 can be disposed between each of the plurality of vibration generation parts 113 and the first base member 111, and can be individually (or in a one-to-one relationship) connected to each of the plurality of vibration generation parts 113. Each of the plurality of first power supply electrodes 115 can be disposed in parallel at a second surface (or a rear surface) of the first base member 111 to overlap each of the plurality of vibration generation parts 113. For example, each of the plurality of first power supply electrodes 115 can be directly formed at the second surface (or the rear surface) of the first base member 111. Each of the plurality of first power supply electrodes 115 can be implemented in a linear shape extending long in the first direction X. For example, the plurality of first power supply electrodes 115 can be spaced apart from each other in the second direction Y. The number of the first power supply electrodes 115 can be the same as the number of the vibration generation parts 113.

[0294] Each of the plurality of first power supply electrodes 115 according to an embodiment of the disclosure can be electrically connected to the first electrode layer 113b of each of the plurality of vibration generation parts 113 in a one-to-one relationship through an anisotropic conductive film. Each of the plurality of first power supply electrodes 115 according to another embodiment of the disclosure can be electrically connected to the first electrode layer 113b of each of the plurality of vibration generation parts 113 in a one-to-one relationship through a conductive material (or particles) included in the adhesive layer 114 or the first adhesive layer 114a, rather than through the anisotropic conductive film.

[0295] Each of the plurality of second power supply electrodes 116 can be disposed between each of the plurality of vibration generation parts 113 and the second base member 112, and can be electrically connected to each of the plurality of vibration generation parts 113 in a one-to-one relationship. Each of the plurality of second power supply electrodes 116 can be disposed in parallel at a first surface (or an upper surface) of the second base member 112 to cross each of the plurality of vibration generation parts 113. For example, each of the plurality of second power supply electrodes 116 can be directly formed at the first surface (or the upper surface) of the second base member 112. Each of the plurality of second power supply electrodes 116 can be implemented in a linear shape extending longer in the second direction Y to cross each of the plurality of first power supply electrodes 115. For example, the plurality of second power supply electrodes 116 can be spaced apart from each other in the first direction X. For example, the number of the second power supply electrodes 116 can be the same as the number of the vibration generation parts 113, and can be the same as the number of the first power supply electrodes 115.

[0296] Each of the plurality of second power supply electrodes 116 according to an embodiment of the disclosure can be electrically connected to the second electrode layer 113c of each of the plurality of vibration generation parts 113 in a one-to-one relationship through an anisotropic conductive film. Each of the plurality of second power supply electrodes 116 according to another embodiment of the disclosure can be electrically connected to the second electrode layer 113c of each of the plurality of vibration generation parts 113 in a one-to-one relationship through a conductive material (or particles) included in the adhesive layer 114 or the second adhesive layer 114b, instead of the anisotropic conductive film.

[0297] The first vibration structure 110 according to an embodiment of the disclosure can include a plurality of first power supply lines 117, a plurality of second power supply lines 118, and a pad portion 119.

[0298] Each of the plurality of first power supply lines 117 can be electrically connected to each of the plurality of first power supply electrodes 115 in a one-to-one relationship. Each of the plurality of first power supply lines 117 can be directly formed at a second surface (or a rear surface) of the first base member 111 together with each of the plurality of first power supply electrodes 115. For example, each of the plurality of first power supply lines 117 can be disposed at the first to third peripheral portions of the second surface peripheral portion of the first base member 111, and can be electrically connected to each of the plurality of first power supply electrodes 115 in a one-to-one relationship. For example, the number of the first power supply lines 117 can be the same as the number of the first power supply electrodes 115.

[0299] According to an embodiment of the disclosure, odd power supply lines 117a of the plurality of first power supply lines 117 can be disposed in parallel at the first and third peripheral portions of the second surface peripheral portion of the first base member 111 and can be electrically connected to the first side (or one end) of the odd power supply electrodes of the plurality of first power supply electrodes 115. Even power supply lines 117b of the plurality of first power supply lines 117 can be disposed in parallel at the first and second peripheral portions of the second surface peripheral portion of the first base member 111 and can be electrically connected to the second side (or the other end) opposite to the first side (or one end) of the even power supply electrodes of the plurality of first power supply electrodes 115.

[0300] Each of the plurality of second power supply lines 118 can be electrically connected to each of the plurality of first power supply electrodes 115 in a one-to-one relationship. Each of the plurality of second power supply lines 118 can be directly formed at the first surface (or upper surface) of the second base member 112 together with each of the plurality of second power supply electrodes 116. For example, each of the plurality of second power supply lines 118 can be disposed at the first peripheral portion of the first surface peripheral portion of the second base member 112 and can be electrically connected to each of the plurality of second power supply electrodes 116 in a one-to-one relationship. For example, the number of the second power supply lines 118 can be the same as the number of the second power supply electrodes 116.

[0301] Each of the plurality of second power supply lines 118 can be disposed not to overlap each of the plurality of first power supply lines 117, and thus, can be electrically disconnected (or isolated) from the plurality of first power supply lines 117.

[0302] The pad portion 119 (or first pad portion) can be disposed at the first peripheral portion of the second surface peripheral portion of the first base member 111 and the first peripheral portion of the first surface peripheral portion of the second base member 112. For example, the pad portion 119 can be disposed between the first peripheral portion of the second surface peripheral portion of the first base member 111 and the central portion.

[0303] The pad portion 119 according to an embodiment of the disclosure can include a plurality of first pads 119a disposed in parallel at the first peripheral portion of the second surface peripheral portion of the first base member 111 and a plurality of second pads 119b disposed in parallel at the first peripheral portion of the first surface peripheral portion of the second base member 112.

[0304] Each of the plurality of first pads 119a can be electrically connected to the end portion of each of the plurality of first power supply lines 117. Thus, each of the plurality of first pads 119a can be electrically connected to each of the plurality of first power supply electrodes 115 in a one-to-one relationship through each of the plurality of first power supply lines 117.

[0305] Each of the plurality of second pads 119b can be electrically connected to an end of each of the plurality of second power supply lines 118. Accordingly, each of the plurality of second pads 119b can be electrically connected to each of the plurality of second power supply electrodes 116 in a one-to-one relationship through each of the plurality of second power supply lines 118.

[0306] The plurality of first pads 119a and the plurality of second pads 119b can be disposed in parallel at a first periphery portion of the second surface periphery portion of the first base member 111, thereby being electrically disconnected (or isolated) from each other without being electrically connected to each other. For example, first pads of the plurality of first pads 119a connected to the odd-numbered power supply lines 117a can be disposed at a first side of the pad portion 119. Second pads of the plurality of first pads 119a connected to the even-numbered power supply lines 117b can be disposed at a second side of the pad portion 119. The plurality of second pads 119b can be disposed between the first side and the second side of the pad portion 119.

[0307] According to one embodiment of the disclosure, any one or more of the first base member 111 and the second base member 112 can further include a plurality of pad holes (or first pad holes) overlapping the plurality of first pads 119a and the plurality of second pads 119b, respectively. For example, each of the plurality of pad holes can be formed through the first base member 111 (or the second base member 112) overlapping at least a portion of each of the plurality of first pads 119a and the plurality of second pads 119b, and thus at least a portion of each of the plurality of first pads 119a and the plurality of second pads 119b can be exposed outside the first surface (or the second surface) of the first vibration structure 110.

[0308] The first vibration structure 110 according to the embodiment of the disclosure can further include a flexible cable FC.

[0309] The flexible cable FC can be electrically connected to the pad portion 119. Accordingly, the flexible cable FC can transmit a first vibration driving signal provided from a vibration driving circuit to the corresponding pad portion 119. The flexible cable FC according to the embodiment of the disclosure can include a plurality of first signal transmission lines STL1 electrically connected to each of the plurality of first pads 119a of the pad portion 119, and a plurality of second signal transmission lines STL2 electrically connected to each of the plurality of second pads 119b of the pad portion 119. For example, the flexible cable FC can be a flexible printed circuit cable or a flexible flat cable, but embodiments of the disclosure are not limited thereto.

[0310] The first vibration driving signal can have an alternating current (AC) form including a first polarity signal and a second polarity signal. The first polarity signal can be one of a positive (+) signal and a negative (-) signal, and the second polarity signal can be the other signal of the positive (+) signal and the negative (-) signal other than the first polarity signal. For example, the first polarity signal and the second polarity signal of the first vibration driving signal can be respectively provided to the first electrode layer 113b and the second electrode layer 113c based on the dielectric polarization direction of the vibration portion 113a configured in the vibration generation portion 113.

[0311] According to an embodiment of the present disclosure, the first polarity signal of the first vibration driving signal can be provided to the first electrode layer 113b of each of the plurality of vibration generation portions 113 through the first signal transmission line STL1 of the flexible cable FC, the first pad 119a of the pad portion 119, and the first power line 117. The second polarity signal of the first vibration driving signal can be provided to the second electrode layer 113c of each of the plurality of vibration generation portions 113 through the second signal transmission line STL2 of the flexible cable FC, the second pad 119b of the pad portion 119, and the second power line 118.

[0312] According to another embodiment of the present disclosure, the first polarity signal of the first vibration driving signal can be provided to the second electrode layer 113c of each of the plurality of vibration generation portions 113 through the first signal transmission line STL1 of the flexible cable FC, the second pad 119b of the pad portion 119, and the second power line 118. The second polarity signal of the first vibration driving signal can be provided to the first electrode layer 113b of each of the plurality of vibration generation portions 113 through the second signal transmission line STL2 of the flexible cable FC, the first pad 119a of the pad portion 119, and the first power line 117.

[0313] The flexible cable FC according to the embodiment of the disclosure can further include a plurality of protruding lines (or finger lines) protruding from end portions of the plurality of first signal transmission lines STL1 and the plurality of second signal transmission lines STL2, respectively. Each of the plurality of protruding lines can protrude (or extend) from the end portions of each of the plurality of first signal transmission lines STL1 and the plurality of second signal transmission lines STL2 to the pad portion 119, which can be disposed between the first base member 111 and the second base member 112 overlapping the pad portion 119. According to the embodiment of the disclosure, each of the plurality of protruding lines can be electrically connected and directly connected to the corresponding pads 119a and 119b of the pads of the pad portion 119 through the bonding layer 114 in a bonding process (or a lamination process) between the first base member 111 and the second base member 112. According to another embodiment of the disclosure, each of the plurality of protruding lines can be electrically connected and directly connected to the corresponding pads 119a and 119b of the pads of the pad portion 119 through a conductive material (or particles) included in the bonding layer 114 or an anisotropic conductive film.

[0314] The first vibration structure 110 according to the embodiment of the disclosure can include a plurality of first power electrodes 115 crossing each other and a plurality of vibration generation regions formed in crossing portions (or crossing regions) between a plurality of second power electrodes 116, each of the plurality of vibration generation portions 113 being located between the plurality of first power electrodes 115.

[0315] The first vibration structure 110 according to the embodiment of the disclosure can generate an acoustic wave based on repeated contraction and expansion of the vibration portion 113a corresponding to each of the plurality of vibration generation regions in response to a first polarity signal (or a second polarity signal) of a first vibration driving signal provided to the first electrode layer 113b of each of the plurality of vibration generation portions 113 through the first power electrode 115 and a second polarity signal (or a first polarity signal) of the first vibration driving signal provided to the second electrode layer 113c of each of the plurality of vibration generation portions 113 through the second power electrode 116.

[0316] According to the embodiment of the disclosure, the first vibration structure 110 can generate an acoustic wave based on repeated contraction and expansion of the vibration portion 113a corresponding to each of the plurality of vibration generation regions in response to a first polarity signal (or a second polarity signal) of a first vibration driving signal sequentially provided to the first electrode layer 113b of each of the plurality of vibration generation portions 113 through the first power electrode 115 and a second polarity signal (or a first polarity signal) of the first vibration driving signal sequentially provided to the second electrode layer 113c of each of the plurality of vibration generation portions 113 through the second power electrode 116, based on a passive matrix type.

[0317] According to another embodiment of the disclosure, the first vibration structure 110 can generate an acoustic wave based on repeated contraction and expansion of the vibration portion 113a corresponding to a portion of the plurality of vibration generation regions in response to a first polarity signal (or a second polarity signal) of the first vibration driving signal simultaneously provided to the first electrode layer 113b of a portion of the plurality of vibration generation portions 113 through a portion of the plurality of first power supply electrodes 115 and a second polarity signal (or a first polarity signal) of the first vibration driving signal simultaneously provided to the second electrode layer 113c of a portion of the plurality of vibration generation portions 113 through a portion of the plurality of second power supply electrodes 116. For example, when the first vibration structure 110 according to the embodiment of the disclosure generates an ultrasonic wave and the width of each of the plurality of vibration generation portions 113 is 1 cm, the first vibration structure 110 can generate an acoustic wave based on repeated contraction and expansion of the vibration portion 113a corresponding to 3x3 vibration generation regions UWA in response to the first polarity signal (or the second polarity signal) provided to three first power supply electrodes 115 adjacent to each other in the first direction X and the second polarity signal (or the first polarity signal) of the first vibration driving signal provided to three second power supply electrodes 116 adjacent to each other in the second direction Y.

[0318] As described above, based on the first acoustic wave SW1 generated from the first vibration structure 110 and the second acoustic wave SW2 generated from the second vibration structure 130, the vibration device according to the embodiment of the disclosure can output a sound having an enhanced sound pressure level characteristic of a mid-low pitch sound band, or can output a sound having directivity or a directivity angle. In addition, the vibration device according to the embodiment of the disclosure can change the position or size of the overlapping region between the first acoustic wave SW1 generated from the first vibration structure 110 and the second acoustic wave SW2 generated from the second vibration structure 130, and thus, can change the directivity direction of the sound and / or the directivity angle of the sound, and can output a sound having a minimum directivity angle (or directivity).

[0319] Figure 5 is a plan view of a second vibration structure according to another embodiment of the disclosure shown in Figure 3 is a cross-sectional view of the second vibration structure taken along the line I-I' shown in Figure 5 is shown in Figure 3 .

[0320] Referring to Figure 1 , Figure 3 and Figure 5 , the second vibration structure 130 according to another embodiment of the disclosure can include the first base member 111, the second base member 112, and the plurality of vibration generation portions 113.

[0321] The first base member 111 and the second base member 112 can be disposed to overlap each other. For example, the first base member 111 can be disposed or aligned on the second base member 112. The first base member 111 and the second base member 112 of the second vibration structure 130 can be the same as those of the first vibration structure 110 described above with reference to FIGS. 1A and 1B, and thus the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted or will be briefly given below. Figure 3 and Figure 4 The first base member 111 and the second base member 112 of the second vibration structure 130 are the same as those of the first vibration structure 110 described above with reference to FIGS. 1A and 1B, and thus the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted or will be briefly given below.

[0322] One or more of the first base member 111 and the second base member 112 of the second vibration structure 130 can be coupled or connected to the front surface (or upper surface) of the first vibration structure 110 by the adhesive member 120. As an embodiment of the present disclosure, the second surface (or rear surface) of the second base member 112 of the second vibration structure 130 can be coupled or connected to the front surface of the first vibration structure 110 by the adhesive member 120.

[0323] Each of the plurality of vibration generation parts (or second vibration generation parts) can be disposed or inserted between the first base member 111 and the second base member 112. For example, each of the plurality of second vibration generation parts can be implemented in a linear shape extending long in the first direction X. For example, the plurality of second vibration generation parts can be spaced apart from each other in the second direction Y crossing the first direction X.

[0324] Each of the vibration generation parts 113 of the second vibration structure 130 and each of the vibration generation parts 113 of the first vibration structure 110 can overlap to be displaced (or vibrated) in the same direction.

[0325] According to an embodiment of the present disclosure, each of the vibration generation parts 113 of the second vibration structure 130 and each of the vibration generation parts 113 of the first vibration structure 110 can have the same size within an error range of a manufacturing process. As an embodiment of the present disclosure, with respect to the first direction X or the second direction Y, a central portion of each of the vibration generation parts 113 of the second vibration structure 130 and a central portion of each of the vibration generation parts 113 of the first vibration structure 110 can be aligned or disposed at a virtual extension line VL extending in a thickness direction Z of the vibration device. As another embodiment of the present disclosure, an end portion of each of the vibration generation parts 113 of the second vibration structure 130 and an end portion of each of the vibration generation parts 113 of the first vibration structure 110 can be aligned or disposed at the virtual extension line VL.

[0326] Each of the vibration generating portions 113 of the second vibration structure 130 and each of the vibration generating portions 113 of the first vibration structure 110 can be displaced (or driven or vibrated) in the same direction and can overlap without being interleaved, and thus, the amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 can be maximized. Accordingly, the sound pressure level characteristics of the sound generated based on the displacement of the first vibration structure 110 and the second vibration structure 130 and the sound characteristics of the mid-low tone sound band can be enhanced. For example, when each of the vibration generating portions 113 of the second vibration structure 130 and each of the vibration generating portions 113 of the first vibration structure 110 are displaced in different directions and overlap to be interleaved, the displacement direction and the amplitude displacement of each of the vibration generating portions 113 of the second vibration structure 130 can not match the displacement direction and the amplitude displacement of each of the vibration generating portions 113 of the first vibration structure 110, and thus, the amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 can not be maximized.

[0327] In the second vibration structure 130 according to the embodiment of the disclosure, each of the plurality of vibration generating portions 113 can include a vibration portion 113a including a piezoelectric material, a first electrode layer 113b disposed at a first surface of the vibration portion 113a, and a second electrode layer 113c disposed at a second surface of the vibration portion 113a opposite the first surface. In each of the vibration generating portions 113 of the second vibration structure 130, the vibration portion 113a, the first electrode layer 113b, and the second electrode layer 113c can be the same as those of each of the plurality of vibration generating portions 113 disposed in the first vibration structure 110 described above with reference to Figure 3 and Figure 4 the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0328] The second vibration structure 130 according to the embodiment of the disclosure can further include an adhesive layer 114 disposed between the first base member 111 and the second base member 112 to surround a side surface (or a side wall) of each of the plurality of vibration generating portions 113. The adhesive layer 114 of the second vibration structure 130 can be the same as the adhesive layer 114 of the first vibration structure 110 described above with reference to Figure 3 and Figure 4 the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0329] The second vibration structure 130 according to the embodiment of the disclosure can further include a plurality of first power supply electrodes 115 and a plurality of second power supply electrodes 116.

[0330] In the second vibration structure 130, the plurality of first power electrodes 115 and the plurality of second power electrodes 116 can be respectively the same as the plurality of first power electrodes 115 and the plurality of second power electrodes 116 disposed in the first vibration structure 110 described above with reference to Figure 3 and Figure 4 The plurality of first power electrodes 115 and the plurality of second power electrodes 116 disposed in the second vibration structure 130 are the same as those described above with reference to the first vibration structure 110, and thus the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted or will be briefly given below.

[0331] Each of the plurality of first power electrodes 115 disposed in the second vibration structure 130 can overlap each of the plurality of second power electrodes 116 disposed in the first vibration structure 110, or can be stacked without being interleaved.

[0332] According to an embodiment of the disclosure, each of the plurality of first power electrodes 115 disposed in the second vibration structure 130 can be electrically connected to the first electrode layer 113b of each of the plurality of vibration generation parts 113 in a one-to-one relationship through an anisotropic conductive film. According to another embodiment of the disclosure, each of the plurality of first power electrodes 115 disposed in the second vibration structure 130 can be electrically connected to the first electrode layer 113b of each of the plurality of vibration generation parts 113 in a one-to-one relationship through a conductive material (or particles) included in the adhesive layer 114 or the first adhesive layer 114a, instead of the anisotropic conductive film.

[0333] Each of the plurality of second power electrodes 116 disposed in the second vibration structure 130 can overlap each of the plurality of second power electrodes 116 disposed in the first vibration structure 110, or can be stacked without being interleaved.

[0334] According to an embodiment of the disclosure, each of the plurality of second power electrodes 116 disposed in the second vibration structure 130 can be electrically connected to the second electrode layer 113c of each of the plurality of vibration generation parts 113 in a one-to-one relationship through an anisotropic conductive film. According to another embodiment of the disclosure, each of the plurality of second power electrodes 116 disposed in the second vibration structure 130 can be electrically connected to the second electrode layer 113c of each of the plurality of vibration generation parts 113 in a one-to-one relationship through a conductive material (or particles) included in the adhesive layer 114 or the second adhesive layer 114b, instead of the anisotropic conductive film.

[0335] The second vibration structure 130 according to an embodiment of the disclosure can include a plurality of first power lines 117, a plurality of second power lines 118, and a pad portion 119.

[0336] The plurality of first power lines 117, the plurality of second power lines 118, and the pad portion 119 provided in the second vibration structure 130 can be respectively the same as the plurality of first power lines 117, the plurality of second power lines 118, and the pad portion 119 provided in the first vibration structure 110 described above with reference to FIGS. 1A and 1B, and thus, the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted or will be briefly given below. Figure 3 and Figure 4 The plurality of first power lines 117, the plurality of second power lines 118, and the pad portion 119 provided in the second vibration structure 130 can be respectively the same as the plurality of first power lines 117, the plurality of second power lines 118, and the pad portion 119 provided in the first vibration structure 110 described above with reference to FIGS. 1A and 1B, and thus, the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted or will be briefly given below.

[0337] According to embodiments of the present disclosure, odd power lines 117a of the plurality of first power lines 117 provided in the second vibration structure 130 can be provided in parallel at the first and second peripheral portions of the second surface peripheral portion of the first base member 111, and can be electrically connected to the second side (or the other end) of the odd power electrodes of the plurality of first power electrodes 115. Even power lines 117b of the plurality of first power lines 117 provided in the second vibration structure 130 can be provided in parallel at the first and third peripheral portions of the second surface peripheral portion of the first base member 111, and can be electrically connected to the first side (or the one end) of the even power electrodes of the plurality of first power electrodes 115.

[0338] Each of the plurality of second power lines 118 provided in the second vibration structure 130 can be directly formed at the first surface (or the upper surface) of the second base member 112 together with each of the plurality of second power electrodes 116. For example, the plurality of second power lines 118 can be provided in parallel at the first peripheral portion of the first surface peripheral portion of the second base member 112, and can be electrically connected in a one-to-one relationship and connected to the plurality of second power electrodes 116, respectively.

[0339] Each of the plurality of second power lines 118 provided in the second vibration structure 130 can be provided not to overlap each of the plurality of first power lines 117, and thus, can be electrically disconnected (or isolated) from each of the plurality of first power lines 117.

[0340] The pad portion 119 (or the second pad portion) provided in the second vibration structure 130 can be provided between the other side of the first peripheral portion and the central portion of the second surface peripheral portion of the first base member 111.

[0341] According to one embodiment of this disclosure, one or more of the first base member 111 and the second base member 112 disposed in the second vibration structure 130 may further include a plurality of pad holes (or first pad holes) overlapping with a plurality of first pads 119a and a plurality of second pads 119b, respectively. For example, each of the plurality of pad holes may be formed to pass through the first base member 111 (or the second base member 112) overlapping at least a portion of each of the plurality of first pads 119a and the plurality of second pads 119b, so that at least a portion of each of the plurality of first pads 119a and the plurality of second pads 119b may be exposed on the outside of the first surface (or the second surface) of the first vibration structure 110.

[0342] The second vibration structure 130 according to an embodiment of this disclosure may further include a flexible cable FC.

[0343] The flexible cable FC can be electrically connected to the pad portion 119 of the second vibration structure 130. The flexible cable FC can be referenced above. Figure 1 and Figure 4 The first vibration structure 110 described is the same as the flexible cable FC; therefore, the same reference numerals denote the same elements, and their repeated descriptions can be omitted.

[0344] The flexible cable FC according to embodiments of this disclosure may further include multiple protruding lines (or finger lines) protruding from the ends of multiple first signal transmission lines STL1 and multiple second signal transmission lines STL2, respectively. These multiple protruding lines may be the same as the protruding lines of the flexible cable FC disposed in the first vibration structure 110; therefore, the same reference numerals denote the same elements, and repeated descriptions thereof are omitted.

[0345] The second vibration structure 130 according to an embodiment of the present disclosure may include a plurality of first power electrodes 115 and a plurality of vibration generating regions formed in the intersection portions (or intersection regions) between a plurality of second power electrodes 116, wherein the plurality of first power electrodes 115 intersect each other and each of the plurality of vibration generating portions 113 is located between the plurality of first power electrodes 115.

[0346] The second vibration structure 130 according to the embodiment of the disclosure can generate an acoustic wave based on repeated contraction and expansion of the vibration portion 113a corresponding to each of the plurality of vibration generation regions, in response to a first polarity signal (or a second polarity signal) of a second vibration driving signal provided to the first electrode layer 113b of each of the plurality of vibration generation portions 113 through the first power electrode 115 and a second polarity signal (or a first polarity signal) of the second vibration driving signal provided to the second electrode layer 113c of each of the plurality of vibration generation portions 113 through the second power electrode 116. The operation of the second vibration structure 130 to generate an acoustic wave can be the same as that of the first vibration structure 110, and thus repetitive description thereof can be omitted.

[0347] Figure 6 is a plan view of a first vibration structure according to another embodiment of the disclosure shown in Figure 1 and Figure 3 , Figure 7 is a plan view of a second vibration structure according to another embodiment of the disclosure shown in Figure 1 and Figure 3 . Figure 6 and Figure 7 illustrate embodiments achieved by modifying the vibration generation portion of each of the first vibration structure and the second vibration structure shown in Figures 3 to 5 . Thus, in the following description, repetitive description of elements other than the vibration generation portion of each of the first vibration structure and the second vibration structure and elements related thereto can be omitted or will be briefly given. Along Figure 6 and Figure 7 , a cross-sectional view of each of the first vibration structure and the second vibration structure taken along the line I-I' shown in Figure 3 is illustrated in

[0348] Referring to Figure 1 , Figure 3 and Figure 6 , in the first vibration structure 110 according to another embodiment of the disclosure, the plurality of vibration generation portions 113 can be spaced apart from each other in the first direction X and the second direction Y. For example, the plurality of vibration generation portions 113 can be disposed only in the intersection portions (or intersection regions) between the plurality of first power electrodes 115 and the plurality of second power electrodes 116, respectively. For example, the number of the vibration generation portions 113 can be the same as the number of the intersection portions of the first power electrodes 115 and the second power electrodes 116.

[0349] The plurality of vibration generation parts 113 according to another embodiment of the disclosure can have an island shape in which the plurality of vibration generation parts 113 are respectively disposed between the intersection parts between the plurality of first power electrodes 115 and the plurality of second power electrodes 116. For example, each of the plurality of vibration generation parts 113 can have a size greater than a size of each of the intersection parts (intersection regions) between the plurality of first power electrodes 115 and the plurality of second power electrodes 116. For example, each of the plurality of vibration generation parts 113 can have a regular hexahedral structure or a square cross-sectional structure having a width direction length of 1 cm and a length direction length of 1 cm.

[0350] In the first vibration structure 110, each of the plurality of vibration generation parts 113 can be divided in the first direction X by a set of the second power electrodes 116, and can be divided in the second direction Y by a set of the first power electrodes 115, and thus, based on individual vibrations of each of the plurality of vibration generation parts 113, a sharp (or clear) and accurate sound wave can be generated without noise caused by parasitic interference between the plurality of vibration generation parts 113.

[0351] The first vibration structure 110 according to another embodiment of the disclosure can generate sound waves having various frequencies (or resonance frequencies) based on the size of the vibration regions in the plurality of vibration generation parts 113 or the number of the vibration generation parts 113. For example, when each of the plurality of vibration generation parts 113 has a size of 1 cm, the first vibration structure 110 can generate an ultrasonic wave based on individual simultaneous vibrations of nine vibration generation parts 113 corresponding to 3×3 vibration generation regions UWA in response to a first polarity signal (or a second polarity signal) of the first vibration driving signal provided to three first power electrodes 115 adjacent to each other in the first direction X and a second polarity signal (or a first polarity signal) of the first vibration driving signal provided to three second power electrodes 116 adjacent to each other in the second direction Y.

[0352] Referring to Figure 1 , Figure 3 and Figure 7 , in the second vibration structure 130 according to another embodiment of the disclosure, the plurality of vibration generation parts 113 can be spaced apart from each other in the first direction X and the second direction Y. For example, each of the plurality of vibration generation parts 113 can be disposed only in the intersection parts (or intersection regions) between the plurality of first power electrodes 115 and the plurality of second power electrodes 116, respectively. The plurality of vibration generation parts 113 disposed in the second vibration structure 130 can be accurately overlapped or accurately stacked on the plurality of vibration generation parts 113 disposed in the first vibration structure 110, respectively. The plurality of vibration generation parts 113 disposed in the second vibration structure 130 according to another embodiment of the disclosure can be the same as the plurality of vibration generation parts 113 described above with reference to the first vibration structure 110. Figure 6 The plurality of vibration generation parts 113 described as being disposed in the first vibration structure 110 are identical, and thus repeated descriptions thereof can be omitted.

[0353] In the second vibration structure 130, each of the plurality of vibration generation parts 113 can be divided by the second power supply electrode 116 unit in the first direction X and can be divided by the first power supply electrode 115 unit in the second direction Y, and thus a sharp (or clear) and accurate sound wave can be generated based on individual vibrations of each of the plurality of vibration generation parts 113 without noise caused by parasitic interference between the plurality of vibration generation parts 113.

[0354] Thus, the vibration device including the first vibration structure 110 and the second vibration structure 130 according to another embodiment of the disclosure can generate a sharper and more accurate sound wave based on individual simultaneous vibrations of the plurality of vibration generation parts 113 and can generate a sound wave having various frequencies (or resonance frequencies) based on the size of the vibration region in the plurality of vibration generation parts 113 or the number of the vibration generation parts 113.

[0355] Figure 8 is a plan view of a first vibration structure according to another embodiment of the disclosure shown in Figure 1 and Figure 3 , Figure 9 is a plan view of a second vibration structure according to another embodiment of the disclosure shown in Figure 1 and Figure 3 . Figure 8 and Figure 9 illustrate embodiments implemented by modifying the plurality of first power supply electrodes and the plurality of first power supply lines shown in Figures 3 to 5 . Thus, in the following description, repeated descriptions of elements other than the first power supply electrode and the first power supply line of each of the first vibration structure and the second vibration structure and elements related thereto can be omitted or will be briefly given below. Along Figure 8 and Figure 9 , a cross-sectional view of each of the first vibration structure and the second vibration structure taken along the line I-I' shown in Figure 3 is shown in

[0356] Referring to Figure 1 , Figure 3 and Figure 8 , in the first vibration structure 110 according to another embodiment of the disclosure, the plurality of first power supply electrodes 115 can be spaced apart from each other in each of the first direction X and the second direction Y. For example, the plurality of first power supply electrodes 115 can be respectively disposed at the plurality of vibration generation parts 113 spaced apart from each other in the first direction X.

[0357] The plurality of first power electrodes 115 according to another embodiment of the disclosure can each have an island shape, which is disposed at the plurality of vibration generation parts 113 that respectively overlap the plurality of second power electrodes 116. For example, each of the plurality of first power electrodes 115 can have a rectangular shape that intersects each of the plurality of second power electrodes 116 in the first direction X, but embodiments of the disclosure are not limited thereto. For example, each of the plurality of first power electrodes 115 can be divided in the first direction X in units of the second power electrodes 116, and can be divided in the second direction Y in units of the vibration generation parts 113.

[0358] The plurality of first power lines 117 can be electrically connected and respectively connected to the plurality of first power electrodes 115 that are spaced apart from each other in the first direction X and the second direction Y. For example, the plurality of first power lines 117 can be disposed in parallel at the second and third peripheral parts of the second surface peripheral part of the first base member 111, and can be electrically connected and respectively connected to the plurality of first power electrodes 115. Except that the number of the first power lines 117 is the same as the number of the first power electrodes 115, the first power lines 117 can be similar to the plurality of first power lines 117 described above with reference to FIGS. 1A and 1B, and thus, repetitive description thereof can be omitted. Figure 3 and Figure 4

[0359] In the first vibration structure 110, each of the plurality of first power electrodes 115 can be divided in the first direction X in units of the second power electrodes 116, and can be divided in the second direction Y in units of the vibration generation parts 113, and thus, each of the plurality of vibration generation regions or the plurality of vibration generation parts 113 that respectively overlap the plurality of first power electrodes 115 can individually vibrate based on the first vibration driving signal selectively supplied through each of the plurality of first power electrodes 115 to generate a sound wave.

[0360] ​The first vibration structure 110 according to another embodiment of the disclosure can generate sound waves having various frequencies (or resonance frequencies) based on the size of the vibration area or the number of vibration generation parts 113 that vibrate based on the first vibration driving signal selectively provided to each of the plurality of first power electrodes 115. For example, when each of the plurality of vibration generation parts 113 has a size of 1 cm, the first vibration structure 110 can generate sound waves based on the individual simultaneous vibration of nine vibration generation parts 113 corresponding to 3x3 vibration generation areas UWA in response to a first polarity signal (or a second polarity signal) of the first vibration driving signal provided to nine first power electrodes 115 adjacent to each other in the first direction X and a second polarity signal (or a first polarity signal) of the first vibration driving signal provided to three second power electrodes 116 adjacent to each other in the second direction Y.

[0361] Referring to Figure 1 , Figure 2 and Figure 9 , in the second vibration structure 130 according to another embodiment of the disclosure, the plurality of first power electrodes 115 can be spaced apart from each other in each of the first direction X and the second direction Y. For example, the plurality of first power electrodes 115 can be disposed at the plurality of vibration generation parts 113 spaced apart from each other in the first direction X, respectively. The plurality of first power electrodes 115 disposed in the second vibration structure 130 according to another embodiment of the disclosure can be the same as the plurality of first power electrodes 115 disposed in the first vibration structure 110 described above with reference to Figure 8 , and thus a repeated description thereof is omitted.

[0362] In the second vibration structure 130 according to another embodiment of the disclosure, the plurality of first power lines 117 can be disposed in parallel at the second and third peripheral portions of the second surface peripheral portion of the first base member 111, and can be electrically connected to the plurality of first power electrodes 115, respectively. The plurality of first power lines 117 disposed in the second vibration structure 130 according to another embodiment of the disclosure can be the same as the plurality of first power lines 117 disposed in the first vibration structure 110 described above with reference to Figure 8 , and thus a repeated description thereof is omitted.

[0363] In the second vibration structure 130, each of the plurality of first power electrodes 115 can be divided by a set of second power electrodes 116 in the first direction X, and can be divided by a set of vibration generation parts 113 in the second direction Y, and thus each of a plurality of vibration generation areas or a plurality of vibration generation parts 113 respectively overlapping the plurality of first power electrodes 115 can individually vibrate based on the first vibration driving signal selectively provided through each of the plurality of first power electrodes 115 to generate an acoustic wave.

[0364] The second vibration structure 130 according to another embodiment of the disclosure can generate an acoustic wave having various frequencies (or resonance frequencies) based on the size of the vibration area or the number of vibration generation parts 113 that vibrate based on the first vibration driving signal selectively provided to each of the plurality of first power electrodes 115. For example, when each of the plurality of vibration generation parts 113 has a size of 1 cm, the second vibration structure 130 can generate an acoustic wave based on individual simultaneous vibrations of nine vibration generation parts 113 corresponding to 3x3 vibration generation areas UWA in response to a first polarity signal (or a second polarity signal) of the second vibration driving signal provided to nine first power electrodes 115 adjacent to each other in the first direction X and a second polarity signal (or a first polarity signal) of the second vibration driving signal provided to three second power electrodes 116 adjacent to each other in the second direction Y.

[0365] Therefore, the vibration device including the first vibration structure 110 and the second vibration structure 130 according to another embodiment of the disclosure can generate an acoustic wave based on individual vibrations of the vibration generation areas of the plurality of vibration generation parts 113 respectively overlapping the plurality of first power electrodes 115.

[0366] Figure 10 is a plan view of a first vibration structure according to another embodiment of the disclosure shown in Figure 1 and Figure 3 is a plan view of a second vibration structure according to another embodiment of the disclosure shown in Figure 11 is a plan view of a first vibration structure according to another embodiment of the disclosure shown in Figure 1 and Figure 3 is a plan view of a second vibration structure according to another embodiment of the disclosure. Figure 10 and Figure 11 show embodiments implemented by modifying the plurality of vibration generation parts shown in Figure 8 and Figure 9 Thus, in the following description, repetitive descriptions of elements other than the plurality of vibration generation parts of each of the first vibration structure and the second vibration structure and elements related thereto can be omitted or briefly given below. Along Figure 10 and Figure 11a cross-sectional view of each of the first vibration structure and the second vibration structure taken along the line I-I' shown in FIG. 1 is shown in Figure 3 .

[0367] Referring to Figure 1 , Figure 3 and Figure 10 , in the first vibration structure 110 according to another embodiment of the disclosure, the plurality of vibration generation parts 113 can be spaced apart from each other in each of the first direction X and the second direction Y. For example, the plurality of vibration generation parts 113 can be disposed only in the intersection portions (or intersection regions) between the plurality of first power electrodes 115 and the plurality of second power electrodes 116, respectively. For example, the number of the vibration generation parts 113 can be the same as the number of the intersection portions (or intersection regions) between the plurality of first power electrodes 115 and the plurality of second power electrodes 116. The plurality of vibration generation parts 113 disposed in the first vibration structure 110 can be the same as the plurality of vibration generation parts 113 disposed in the first vibration structure 110 described above with reference to Figure 6 , and thus a repeated description thereof is omitted.

[0368] Referring to Figure 1 , Figure 3 and Figure 11 , in the second vibration structure 130 according to another embodiment of the disclosure, the plurality of vibration generation parts 113 can be spaced apart from each other in each of the first direction X and the second direction Y. For example, the plurality of vibration generation parts 113 can be disposed only in the intersection portions (or intersection regions) between the plurality of first power electrodes 115 and the plurality of second power electrodes 116, respectively. The plurality of vibration generation parts 113 disposed in the second vibration structure 130 can be precisely overlapped or precisely stacked on the plurality of vibration generation parts 113 disposed in the first vibration structure 110, respectively. The plurality of vibration generation parts 113 disposed in the second vibration structure 130 according to another embodiment of the disclosure can be the same as the plurality of vibration generation parts 113 disposed in the first vibration structure 110 described above with reference to Figure 7 , and thus a repeated description thereof can be omitted.

[0369] Accordingly, the vibration device including the first vibration structure 110 and the second vibration structure 130 according to another embodiment of the disclosure can generate a sharper and more precise sound wave based on the individual simultaneous vibration of the plurality of vibration generation parts 113 (or the plurality of vibration generation regions) overlapped with the plurality of first power electrodes 115, respectively, and can generate a sound wave having various frequencies (or resonance frequencies) based on the size of the vibration region or the number of the vibration generation parts 113 among the plurality of vibration generation parts 113 that vibrate.

[0370] Figure 12A vibration driving circuit of a vibration device according to an embodiment of the disclosure is illustrated. Figure 13 A vibration driving circuit of a vibration device according to another embodiment of the disclosure is illustrated.

[0371] Referring to Figure 1 and Figure 12 The vibration device according to an embodiment of the disclosure can further include a vibration driving circuit 170.

[0372] The vibration driving circuit 170 can be electrically connected to each of the first vibration structure 110 and the second vibration structure 130 through a flexible cable FC. The vibration driving circuit 170 can provide a first vibration driving signal to the first vibration structure 110 and at the same time can provide a second vibration driving signal to the second vibration structure 130, thereby causing each of the first vibration structure 110 and the second vibration structure 130 to vibrate (or displace) in the same direction. For example, the vibration driving circuit 170 can generate each of the first vibration driving signal and the second vibration driving signal based on a sound source.

[0373] The vibration driving circuit 170 according to an embodiment of the disclosure can generate a first vibration driving signal configured to generate a first sound wave SW1 based on vibration of the first vibration structure 110, and can provide the generated first vibration driving signal to the first vibration structure 110, and in addition, can generate a second vibration driving signal configured to generate a second sound wave SW2 based on vibration of the second vibration structure 130, and can provide the generated second vibration driving signal to the second vibration structure 130. According to an embodiment of the disclosure, each of the first sound wave SW1 and the second sound wave SW2 can be one or more of a sound wave of an audible frequency band, a sound wave (or an ultrasonic wave) of an inaudible frequency band without an audible frequency, and a sound wave (or a mixed sound wave) mixed with an audible frequency. For example, the vibration driving circuit 170 can generate a first vibration driving signal for generating a first sound wave SW1 corresponding to an ultrasonic wave, and can generate a second vibration driving signal configured to generate a second sound wave SW2 corresponding to a sound wave (or a mixed sound wave) mixed with an audible frequency, but embodiments of the disclosure are not limited thereto.

[0374] The vibration driving circuit 170 according to an embodiment of the disclosure can include a first amplifier 171 connected to the first vibration structure 110 and a second amplifier 173 connected to the second vibration structure 130.

[0375] The first amplifier (or first signal generating circuit) 171 can generate an AC type first vibration driving signal having a first polarity signal and a second polarity signal based on a sound source. The first amplifier 171 according to the embodiment of the disclosure can include a first output terminal T11 outputting the first polarity signal of the first vibration driving signal and a second output terminal T12 outputting the second polarity signal of the first vibration driving signal.

[0376] The second amplifier (or second signal generating circuit) 173 can generate an AC second vibration driving signal having a first polarity signal and a second polarity signal based on a sound source. The second amplifier 173 according to the embodiment of the disclosure can include a first output terminal T21 outputting the first polarity signal of the second vibration driving signal and a second output terminal T22 outputting the second polarity signal of the second vibration driving signal.

[0377] Each vibration portion 113a of the plurality of vibration generating portions 113 provided in the first vibration structure 110 can have a polarization direction P from the second electrode layer 113c to the first electrode layer 113b. Also, each vibration portion 113a of each of the plurality of vibration generating portions 113 provided in the second vibration structure 130 can have a polarization direction P from the second electrode layer 113c to the first electrode layer 113b. For example, the polarization direction P of the vibration portion 113a provided in the first vibration structure 110 can be the same as the polarization direction P of the vibration portion 113a provided in the second vibration structure 130.

[0378] The first polarity signal of the first vibration driving signal output from the first output terminal T11 of the first amplifier 171 can be provided to the first electrode layer 113b of each of the plurality of vibration generating portions 113 provided in the first vibration structure 110 through the flexible cable FC, and the second polarity signal of the first vibration driving signal output from the second output terminal T12 of the first amplifier 171 can be provided to the second electrode layer 113c of each of the plurality of vibration generating portions 113 provided in the first vibration structure 110 through the flexible cable FC.

[0379] The first polarity signal of the second vibration driving signal output from the first output terminal T21 of the second amplifier 173 can be provided to the first electrode layer 113b of each of the plurality of vibration generating portions 113 provided in the second vibration structure 130, and the second polarity signal of the second vibration driving signal output from the second output terminal T22 of the second amplifier 173 can be provided to the second electrode layer 113c of each of the plurality of vibration generating portions 113 provided in the second vibration structure 130 through the flexible cable FC.

[0380] As shown in FIG. 1, the first vibration structure 110 and the second vibration structure 130 can be provided in the housing 100. Figure 13 As shown in FIG. 1, the first vibration structure 110 and the second vibration structure 130 can be provided in the housing 100. Figure 12 Each vibration portion 113a of the plurality of vibration generation portions 113 in the first vibration structure 110 shown in FIG. 1 can have a polarization direction P from the first electrode layer 113b to the second electrode layer 113c. As shown in FIG. 1, the polarization direction P of each vibration portion 113a of the plurality of vibration generation portions 113 in the first vibration structure 110 can be perpendicular to the first vibration direction V1. Figure 13 Figure 12 Each vibration portion 113a of the plurality of vibration generation portions 113 in the second vibration structure 130 shown in FIG. 2 can have a polarization direction P from the first electrode layer 113b to the second electrode layer 113c.

[0381] Accordingly, Figure 12 and Figure 13 The first vibration structure 110 and the second vibration structure 130 shown in FIGS. 1 and 2 can vibrate in the same direction. For example, each of the first vibration structure 110 and the second vibration structure 130 can simultaneously expand or contract, and thus, the displacement amount (or bending force or flexing force) or amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 can increase or can be maximized, thereby enhancing the sound pressure level characteristics of the sound generated based on the vibration of the first vibration structure 110 and / or the second vibration structure 130 and the sound characteristics of the mid-low tone vocal cords. In addition, the first sound wave SW1 generated based on the vibration of the first vibration structure 110 and the second sound wave SW2 generated based on the vibration of the second vibration structure 110 can be output as overlapping. Accordingly, the vibration device can output sound having directivity or a direct angle based on the overlapping of the first sound wave SW1 and the second sound wave SW2. For example, an overlapping region between the first sound wave SW1 and the second sound wave SW2 can be an audible region enabling a user to hear sound, and a non-overlapping region between the first sound wave SW1 and the second sound wave SW2 can be an inaudible region disabling the user from hearing sound. For example, the first sound wave SW1 can have directivity or a direct angle based on the second sound wave SW2.

[0382] In Figure 12 and Figure 13 In this case, the first vibration structure 110 and the second vibration structure 130 can vibrate in opposite directions. For example, when the first vibration structure 110 expands, the second vibration structure 130 can contract, and thus, the vibration of the first vibration structure 110 and the vibration of the second vibration structure 130 can be offset therebetween, whereby the vibration device can not vibrate.

[0383] ​ Figure 14 A vibration driving circuit of a vibration device according to another embodiment of the disclosure is illustrated. Figure 15 A vibration driving circuit of a vibration device according to another embodiment of the disclosure is illustrated, and an embodiment implemented by modifying the connection structure of the vibration structure and the first amplifier described above with reference to Figure 12 described above with reference to

[0384] With reference to Figure 1 and Figure 14 In a vibration device according to another embodiment of the disclosure, the second vibration structure 130 can be overlapped or stacked on the first vibration structure 110 in a state of being inverted vertically (or up and down) or rotated vertically. For example, the first base member 111 of the second vibration structure 130 can be coupled or connected to the first base member 111 of the first vibration structure 110 by the adhesive member 120. The second base member 112 of the second vibration structure 130 can be a front surface (or an upper surface) of the vibration device.

[0385] Each vibration portion 113a of the plurality of vibration generating portions 113 provided in the first vibration structure 110 can have a polarization direction P from the second electrode layer 113c to the first electrode layer 113b. In addition, each vibration portion 113a of the plurality of vibration generating portions 113 provided in the second vibration structure 130 can have a polarization direction P from the first electrode layer 113b to the second electrode layer 113c. For example, the polarization direction P of the vibration portion 113a provided in the first vibration structure 110 can be opposite to the polarization direction P of the vibration portion 113a provided in the second vibration structure 130.

[0386] In the vibration driving circuit 170, a first polarity signal of the first vibration driving signal output from the first output terminal T11 of the first amplifier 171 can be provided to the first electrode layer 113b of each of the plurality of vibration generating portions 113 provided in the first vibration structure 110 through the flexible cable FC, and a second polarity signal of the first vibration driving signal output from the second output terminal T12 of the first amplifier 171 can be provided to the second electrode layer 113c of each of the plurality of vibration generating portions 113 provided in the first vibration structure 110 through the flexible cable FC.

[0387] In the vibration driving circuit 170, the first polarity signal of the second vibration driving signal output from the first output terminal T21 of the second amplifier 173 can be supplied to the second electrode layer 113c of each of the plurality of vibration generation portions 113 provided in the second vibration structure 130 through the flexible cable FC, and the second polarity signal of the second vibration driving signal output from the second output terminal T22 of the second amplifier 173 can be supplied to the first electrode layer 113b of each of the plurality of vibration generation portions 113 provided in the second vibration structure 130 through the flexible cable FC.

[0388] As shown in Figure 15 each vibration portion 113a of each of the plurality of vibration generation portions 113 provided in the first vibration structure 110 shown in Figure 14 may have a polarization direction P from the first electrode layer 113b to the second electrode layer 113c. As shown in Figure 15 each vibration portion 113a of each of the plurality of vibration generation portions 113 provided in the second vibration structure 130 shown in Figure 14 may have a polarization direction P from the second electrode layer 113c to the first electrode layer 113b.

[0389] Therefore, Figure 14 and Figure 15 the first vibration structure 110 and the second vibration structure 130 shown in can vibrate in the same direction. For example, each of the first vibration structure 110 and the second vibration structure 130 can simultaneously expand or contract, and thus the displacement amount (or bending force or flexural force) or amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 can increase or can be maximized, thereby enhancing the sound pressure level characteristics of the sound generated based on the vibration of the first vibration structure 110 and / or the second vibration structure 130 and the sound characteristics of the mid-low tone vocal cords. In addition, the first sound wave SW1 generated based on the vibration of the first vibration structure 110 and the second sound wave SW2 generated based on the vibration of the second vibration structure 110 can be output to overlap. Accordingly, the vibration device can output sound having directivity or a direct angle based on the overlap of the first sound wave SW1 and the second sound wave SW2. For example, an overlapping region between the first sound wave SW1 and the second sound wave SW2 can be an audible region that enables a user to hear sound, and a non-overlapping region between the first sound wave SW1 and the second sound wave SW2 can be an inaudible region that does not enable the user to hear sound. For example, the first sound wave SW1 can have directivity or a direct angle based on the second sound wave SW2.

[0390] In the vibration device according to another embodiment of the present disclosure, the second vibration structure 130 can be overlapped or can be stacked on the first vibration structure 110 in a state of being vertically inverted or vertically rotated, and thus the first signal transmission line STL1 and the second signal transmission line STL2 of the flexible cable FC connected to the second amplifier 173 can be connected to the second vibration structure 130 without changing the positions.

[0391] In the vibration device according to another embodiment of the present disclosure, the second vibration structure 130 can be overlapped or can be stacked on the first vibration structure 110 in a state of not being vertically inverted. In this case, in order to make the first vibration structure 110 and the second vibration structure 130 vibrate in the same direction, the first signal transmission line STL1 and the second signal transmission line STL2 can be disposed to intersect in the flexible cable FC, or the second amplifier 173 can be disposed such that the first output terminal T21 is connected to the second signal transmission line STL2 and the second output terminal T22 is connected to the first signal transmission line STL1.

[0392] In Figure 14 and Figure 15 , the first polarity signal of the first vibration driving signal can be supplied to the first electrode layer 113b of the first vibration structure 110, the second polarity signal of the first vibration driving signal can be supplied to the second electrode layer 113c of the first vibration structure 110, the first polarity signal of the second vibration driving signal can be supplied to the first electrode layer 113b of the second vibration structure 130, and the second polarity signal of the second vibration driving signal can be supplied to the second electrode layer 113c of the second vibration structure 130. In this case, the first vibration structure 110 and the second vibration structure 130 can vibrate in opposite directions. For example, when the first vibration structure 110 expands, the second vibration structure 130 can contract, and thus the vibration of the first vibration structure 110 and the vibration of the second vibration structure 130 can be offset therebetween, whereby the vibration device can not vibrate.

[0393] Figure 16 is another cross-sectional view taken along the line I-I' shown in Figure 1 , illustrates Figure 17 the vibration generation part shown in Figure 16 , is a plan view showing the first vibration structure shown in Figure 18 , is a plan view showing the second vibration structure shown in Figure 16 . Figure 19 Figure 16 Figure 16 is a cross-sectional view of each of the first vibration structure and the second vibration structure taken along the line I-I' shown in Figure 18 and Figure 19 .

[0394] ​​Referring to Figure 1 and Figures 16 to 18 A vibration device according to another embodiment of the disclosure can include a first vibration structure 110 and a second vibration structure 130 stacked on the first vibration structure 110.

[0395] The first vibration structure 110 according to another embodiment of the disclosure can include a first base member 111, a second base member 112, and a vibration generation portion 213.

[0396] Each of the first base member 111 and the second base member 112 can be the same as each of the first base member 111 and the second base member 112 described above with reference to Figure 2 , and thus the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0397] The vibration generation portion (or first vibration generation portion) 213 can be disposed or inserted between the first base member 111 and the second base member 112.

[0398] The vibration generation portion 213 according to an embodiment of the disclosure can include a piezoelectric material, a composite piezoelectric material, or an electroactive material having a piezoelectric effect. The vibration generation portion 213 can include an inorganic material and an organic material. For example, the vibration generation portion 213 can include a plurality of inorganic material portions configured as a piezoelectric material and at least one organic material portion configured as a flexible material. For example, the vibration generation portion 213 can be referred to as a piezoelectric vibration portion, a piezoelectric composite material layer, a piezoelectric composite material, or a piezoelectric ceramic composite material, etc., but embodiments of the disclosure are not limited thereto.

[0399] The vibration generation portion 213 according to an embodiment of the disclosure can include a plurality of inorganic material portions 213a1 and a plurality of flexible portions 213a2.

[0400] Each of the plurality of inorganic material portions (or a plurality of first portions) 213a1 can be referred to as a vibration layer, a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a piezoelectric vibration portion, a piezoelectric material portion, or an electroactive portion, etc., but embodiments of the disclosure are not limited thereto.

[0401] Each of the plurality of flexible portions (or a plurality of second portions) 213a2 can be referred to as an organic material portion, an adhesive portion, an elastic portion, a bending portion, or a damping portion, etc., but embodiments of the disclosure are not limited thereto.

[0402] The plurality of inorganic material portions 213a1 and the plurality of flexible portions 213a2 can be alternately and repeatedly arranged in the first direction X (or the second direction Y). For example, each of the plurality of inorganic material portions 213a1 and the plurality of flexible portions 213a2 can be disposed (or arranged) in parallel on the same plane (or the same layer).

[0403] Each of the plurality of inorganic material portions (or the plurality of first portions) 213a1 can include the same material as the vibration portion 113a of each of the plurality of vibration generation portions described above with reference to FIG. 1, and thus repetitive description thereof can be omitted. Figure 3

[0404] Each of the plurality of inorganic material portions 213a1 can have a first width W1 parallel to the first direction X (or the second direction Y) and a length parallel to the second direction Y (or the first direction X). For example, each of the plurality of inorganic material portions 213a1 can include a linear or bar shape that extends longer along the first direction X (or the second direction Y). For example, each of the plurality of inorganic material portions 213a1 can be disposed between the plurality of flexible portions 213a2.

[0405] The plurality of flexible portions 213a2 can be disposed (or arranged) in parallel to each other, with the plurality of inorganic material portions 213a1 located between the flexible portions 213a2 and the flexible portions 213a2. For example, the plurality of flexible portions 213a2 can have a second width W2 parallel to the first direction X (or the second direction Y) and a length parallel to the second direction Y (or the first direction X). The first width W1 can be the same as or different from the second width W2. Each of the plurality of flexible portions 213a2 can have the same size, for example, the same width, area, or volume. For example, each of the plurality of flexible portions 213a2 can have the same size (for example, the same width, area, or volume) within a range of process errors that occur in a manufacturing process. For example, the first width W1 can be greater than the second width W2. For example, the inorganic material portions 213a1 and the flexible portions 213a2 can include linear or bar shapes having the same size or different sizes. Accordingly, the vibration generation portion 213 can include the plurality of inorganic material portions 213a1 having a 2-2 type composite structure, and thus can have a resonance frequency of an inaudible frequency band as well as an audible frequency, but embodiments of the present disclosure are not limited thereto. For example, the resonance frequency of the vibration generation portion 213 can vary based on one or more of the length and the thickness of the inorganic material portions 213a1.

[0406] ​Each of the plurality of flexible portions (or the plurality of second portions) 213a2 can be configured to fill a gap between adjacent inorganic material portions 213a1. Each of the plurality of flexible portions 213a2 can be connected to or attached to the adjacent inorganic material portions 213a1. Each of the plurality of flexible portions 213a2 can be configured to fill a gap between two adjacent inorganic material portions 213a1 and can be directly connected or directly attached to the adjacent inorganic material portions 213a1. Thus, the vibration generation portion 213 can extend a desired size or length based on the lateral coupling (or connection) of the inorganic material portions 213a1 and the flexible portions 213a2.

[0407] The flexible portion 213a2 can have a modulus and viscoelasticity lower than that of the inorganic material portion 213a1. The flexible portion 213a2 can enhance the reliability of the inorganic material portion 213a1 vulnerable to impact due to the fragile characteristics. Thus, in the vibration generation portion 213, the vibration energy of the link in the unit cell of the inorganic material portion 213a1 can be increased by the flexible portion 213a2, and thus, the vibration can be increased, and the piezoelectric characteristics and flexibility can be ensured.

[0408] The flexible portion 213a2 according to the embodiments of the present disclosure can be configured to have a material having a loss coefficient of about 0.01 to about 1.0 and a modulus of about 0.1 [GPa] to about 10 [GPa]. For example, the flexible portion 213a2 can include one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but the embodiments of the present disclosure are not limited thereto.

[0409] The flexible portion 213a2 according to the embodiments of the present disclosure can include one or more of an organic material, an organic polymer, an organic piezoelectric material, and an organic non-piezoelectric material having a flexible characteristic compared to the inorganic material portion 213a1.

[0410] The flexible portion 213a2 including the organic piezoelectric material can absorb an impact applied to the inorganic material portion 213a1, thus can improve the total durability of the vibration device, and can provide piezoelectric properties corresponding to a certain level or higher. The organic piezoelectric material according to the embodiment of the disclosure can be an organic material having an electroactive property. For example, the organic piezoelectric material of the flexible portion 213a2 can include at least one or more of polyvinylidene fluoride (PVDF), β-polyvinylidene fluoride (β-PVDF), and polyvinylidene fluoride (PVDF-TrFE), but the embodiment of the disclosure is not limited thereto. For example, the flexible portion 213a2 including the organic non-piezoelectric material can include an adhesion promoter for adhesion between an epoxy resin or a silicone resin and the inorganic material portion 213a1 to obtain a high stiffness property required for the vibration device. For example, the adhesion promoter can be based on a phosphate or the like, but the embodiment of the disclosure is not limited thereto.

[0411] In addition to the high stiffness of the vibration device, the flexible portion 213a2 including the organic non-piezoelectric material can further include a reinforcing agent for a damping property. For example, the reinforcing agent can be a methyl methacrylate-butadiene-styrene (MBS) having a core-shell type or the like, and the content thereof can be about 5 wt% to about 40 wt%. The reinforcing agent can be an elastomer having a core unit type, and can have a high coupling force with an epoxy resin (e.g., an acrylic polymer), and thus the reinforcing agent can enhance the impact resistance or the damping property of the vibration device.

[0412] The first electrode layer 213b can be disposed at the first surface (or the upper surface) of the vibration generation portion 213. For example, the first electrode layer 213b can be disposed between the first surface of the vibration generation portion 213 and the first base member 111. In addition to the first electrode layer 213b being commonly disposed at the first surface of each of the plurality of inorganic material portions 213a1 and the first surface of each of the plurality of flexible portions 213a2 and electrically connected to the first surface of each of the plurality of inorganic material portions 213a1, the first electrode layer 213b can be the same as the first electrode layer 113b described above with reference to FIG. 1, and thus a repetitive description thereof can be omitted. Figure 3 The first electrode layer 213b can be disposed at the first surface (or the upper surface) of the vibration generation portion 213. For example, the first electrode layer 213b can be disposed between the first surface of the vibration generation portion 213 and the first base member 111. In addition to the first electrode layer 213b being commonly disposed at the first surface of each of the plurality of inorganic material portions 213a1 and the first surface of each of the plurality of flexible portions 213a2 and electrically connected to the first surface of each of the plurality of inorganic material portions 213a1, the first electrode layer 213b can be the same as the first electrode layer 113b described above with reference to FIG. 1, and thus a repetitive description thereof can be omitted.

[0413] The second electrode layer 213c can be disposed at the second surface (or the rear surface) of the vibration generation portion 213. For example, the second electrode layer 213c can be disposed between the second surface of the vibration generation portion 213 and the second base member 112. In addition to the second electrode layer 213c being commonly disposed at the second surface of each of the plurality of inorganic material portions 213a1 and the second surface of each of the plurality of flexible portions 213a2 and electrically connected to the second surface of each of the plurality of inorganic material portions 213a1, the second electrode layer 213c can be the same as the second electrode layer 113c described above with reference to FIG. 1, and thus a repetitive description thereof can be omitted. Figure 3The second electrode layer 113c described is the same, and thus repetitive description thereof can be omitted.

[0414] Each of the plurality of inorganic material portions 213a1 provided in the vibration generation portion 213 can be polarized (or poling) by a specific voltage applied to the first electrode layer 213b and the second electrode layer 213c in a specific temperature atmosphere or a temperature atmosphere changing from a high temperature to a room temperature, but embodiments of the present disclosure are not limited thereto. For example, the vibration generation portion 213 can alternately and repeatedly contract and expand according to a piezoelectric effect based on a vibration driving signal applied from the outside to the first electrode layer 213b and the second electrode layer 213c. For example, the vibration generation portion 213 can vibrate in a vertical direction Z and in a planar direction (or horizontal direction) (X, Y) based on vibrations d 33 and d 31 of the first electrode unit 211b and the second electrode unit 211c, respectively. For example, a polarization direction of each of the plurality of inorganic material portions 213a1 can be formed from the first electrode layer 213b to the second electrode layer 213c as shown in Figure 13 and Figure 14 , or can be formed from the second electrode layer 213c to the first electrode layer 213b as shown in Figure 12 and Figure 15 .

[0415] When each of the plurality of flexible portions 213a2 provided in the vibration generation portion 213 includes an organic piezoelectric material, the organic piezoelectric material can be polarized (or poling) by a specific voltage applied to the first electrode layer 213b and the second electrode layer 213c in a specific temperature atmosphere or a temperature atmosphere changing from a high temperature to a room temperature, but embodiments of the present disclosure are not limited thereto. For example, a polarization direction of the organic piezoelectric material can be formed from the first electrode layer 213b to the second electrode layer 213c as shown in Figure 13 and Figure 14 , or can be formed from the second electrode layer 213c to the first electrode layer 213b as shown in Figure 12 and Figure 15 .

[0416] The first vibration structure 110 according to the embodiment of the present disclosure can further include a bonding layer 114 provided between the first base member 111 and the second base member 112 to surround a side surface (or a side wall) of the vibration generation portion 113.

[0417] The adhesive layer 114 can relatively bind the first base member 111 to the second base member 112, between which the vibration generation part 213 is located. The adhesive layer 114 can be disposed in regions other than the vibration generation part 213 in the region between the first base member 111 and the second base member 112. The adhesive layer 114 can be substantially the same as the adhesive layer 114 described above with reference to Figure 3 and Figure 4 Thus, the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0418] The first vibration structure 110 according to the embodiment of the disclosure can further include a plurality of first power supply electrodes 115 and a plurality of second power supply electrodes 116.

[0419] Each of the plurality of first power supply electrodes 115 can be disposed between the vibration generation part 213 and the first base member 111, and can be electrically connected to the first electrode layer 213b of the vibration generation part 213. Except that each of the plurality of first power supply electrodes 115 is disposed at the second surface of the first base member 111 to overlap each of the plurality of inorganic material portions 2131a and is electrically connected to the first electrode layer 213b of the vibration generation part 213, each of the plurality of first power supply electrodes 115 can be the same as each of the plurality of first power supply electrodes 115 described above with reference to 3 and Figure 4 Thus, the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0420] According to an embodiment of the disclosure, each of the plurality of first power supply electrodes 115 can be electrically connected to the first electrode layer 213b of the vibration generation part 213 through an anisotropic conductive film. According to another embodiment of the disclosure, each of the plurality of first power supply electrodes 115 can be electrically connected to the first electrode layer 213b of the vibration generation part 213 through a conductive material (or particles) included in the adhesive layer 114 or the first adhesive layer 114a, instead of the anisotropic conductive film.

[0421] Each of the plurality of second power supply electrodes 116 can be disposed between the vibration generation part 213 and the second base member 112, and can be electrically connected to the second electrode layer 213c of the vibration generation part 213. Except that each of the plurality of second power supply electrodes 116 is disposed at the first surface of the second base member 112 to cross each of the plurality of inorganic material portions 2131a and is disposed at the second electrode layer 213c of the vibration generation part 213, each of the plurality of second power supply electrodes 116 can be the same as each of the plurality of second power supply electrodes 116 described above with reference to Figure 3 and Figure 4Each of the plurality of second power supply electrodes 116 described is identical, and thus the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0422] According to an embodiment of the disclosure, each of the plurality of second power supply electrodes 116 can be electrically connected to the second electrode layer 213c of the vibration generation portion 213 through an anisotropic conductive film. According to another embodiment of the disclosure, each of the plurality of second power supply electrodes 116 can be electrically connected to the second electrode layer 213c of the vibration generation portion 213 through a conductive material (or particles) included in the adhesive layer 114 or the second adhesive layer 114b, instead of the anisotropic conductive film.

[0423] The first vibration structure 110 according to an embodiment of the disclosure can include a plurality of first power supply lines 117, a plurality of second power supply lines 118, and a pad portion 119.

[0424] The plurality of first power supply lines 117, the plurality of second power supply lines 118, and the pad portion 119 can be identical to the plurality of first power supply lines 117, the plurality of second power supply lines 118, and the pad portion 119, respectively, described above with reference to Figure 3 and Figure 4 The plurality of first power supply lines 117, the plurality of second power supply lines 118, and the pad portion 119 described are identical, and thus the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0425] The first vibration structure 110 according to an embodiment of the disclosure can further include a flexible cable FC electrically connected to the pad portion 119. The flexible cable FC can be identical to the flexible cable FC described above with reference to Figure 3 and Figure 4 The flexible cable FC described is identical, and thus the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0426] Referring to Figure 1 , Figure 3 , Figure 16 , Figure 17 and Figure 19 , the second vibration structure 130 according to an embodiment of the disclosure can include the first base member 111, the second base member 112, and the vibration generation portion 213. The first base member 111, the second base member 112, and the vibration generation portion 213 can be identical to the first base member 111, the second base member 112, and the vibration generation portion 213, respectively, described above with reference to Figures 16 to 18 The first base member 111, the second base member 112, and the vibration generation portion 213 described are identical, and thus the same reference numerals denote the same elements, and repetitive description thereof can be omitted or will be briefly given below.

[0427] The vibration generating portions 213 of the first vibration structure 110 and the second vibration structure 130 can be overlapped or can be stacked with each other to be displaced in the same direction. For example, a plurality of inorganic material portions 213a1 provided in the vibration generating portion 213 of the second vibration structure 130 can be overlapped or stacked on the plurality of inorganic material portions 213a1 provided in the vibration generating portion 213 of the first vibration structure 110, respectively, without being interleaved.

[0428] According to an embodiment of the present disclosure, each of the plurality of inorganic material portions 213a1 provided in each of the first vibration structure 110 and the second vibration structure 130 can have the same size within an error range of a manufacturing process. As an embodiment of the present disclosure, a center portion of each of the plurality of inorganic material portions 213a1 provided in the second vibration structure 130 and a center portion of each of the plurality of inorganic material portions 213a1 provided in the first vibration structure 110 can be aligned or provided at a virtual extension line VL extending in a thickness direction Z of the vibration device with respect to the first direction X or the second direction Y. As another embodiment of the present disclosure, an end portion of each of the plurality of inorganic material portions 213a1 provided in the second vibration structure 130 and an end portion of each of the plurality of inorganic material portions 213a1 provided in the first vibration structure 110 can be aligned or provided at the virtual extension line VL.

[0429] The vibration generating portion 213 of the second vibration structure 130 and the vibration generating portion 213 of the first vibration structure 110 can be displaced (or driven) in the same direction and can be overlapped or stacked with each other without being interleaved, and thus the amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 can be maximized. Accordingly, the sound pressure level characteristics of a sound generated based on the displacement of the first vibration structure 110 and the second vibration structure 130 and the sound characteristics of a mid-low pitch sound band can be enhanced.

[0430] The second vibration structure 130 according to the embodiment of the disclosure can further include an adhesive layer 114 disposed between the first base member 111 and the second base member 112 to surround a side surface (or a side wall) of the vibration generation part 213, a plurality of first power supply electrodes 115 electrically connected to the first electrode layer 213b of the vibration generation part 213, a plurality of first power supply lines 117 respectively electrically connected to the plurality of first power supply electrodes 115, a plurality of second power supply electrodes 116 electrically connected to the second electrode layer 213c of the vibration generation part 213, a plurality of second power supply lines 118 respectively electrically connected to the plurality of second power supply electrodes 116, a pad portion 119 electrically connected to each of the plurality of first power supply lines 117 and the plurality of second power supply lines 118, and a flexible cable FC electrically connected to the pad portion 119. The added elements of the second vibration structure 130 can be as described above with reference to Figure 3 and Figure 5 , thus the same reference numerals denote the same elements and repetitive description thereof can be omitted.

[0431] As described above, in the vibration device according to another embodiment of the disclosure, the first vibration structure 110 and the second vibration structure 130 including the vibration generation part 213 having the 2-2 type composite structure and flexibility can be overlapped or can be stacked to vibrate in the same direction, thus, as shown in the vibration device shown in Figures 1 to 5 , the vibration device can output a sound having directivity or a directivity angle, change a directivity direction of the sound and / or the directivity angle of the sound, output a sound having a minimum directivity angle (or directivity), and enhance each of a vibration characteristic, a reliability characteristic, and a sound output characteristic.

[0432] In Figure 18 , the plurality of first power supply electrodes 115 disposed in the first vibration structure 110 can be spaced apart from each other in the first direction X and the second direction Y to respectively overlap the plurality of inorganic material portions 213a1, as shown in Figure 20 . Each of the plurality of first power supply electrodes 115 can be substantially the same as described in Figure 3 and Figure 8 , thus the same reference numerals denote the same elements and repetitive description thereof can be omitted.

[0433] Figure 20 Each of the plurality of first power supply electrodes 115 shown in Figure 3 may be electrically connected to the plurality of first power supply lines 117 in a one-to-one relationship. Each of the plurality of first power supply lines 117 can be substantially the same as described in Figure 8 and , thus the same reference numerals denote the same elements and repetitive description thereof can be omitted.

[0434] In Figure 18 , the plurality of first power electrodes 115 provided in the second vibration structure 130 can be spaced apart from each other in the first direction X and the second direction Y to overlap with the plurality of inorganic material portions 213a1, respectively, as shown in Figure 21 . Each of the plurality of first power lines 117 can be substantially the same as described in Figure 3 and Figure 9 , thus, the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0435] Figure 21 Each of the plurality of first power electrodes 115 shown in Figure 3 may be electrically connected to the plurality of first power lines 117 in a one-to-one relationship. Each of the plurality of first power lines 117 can be substantially the same as described in Figure 9 and , thus, the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0436] As described above, the vibration device including the first vibration structure 110 and the second vibration structure 130 according to another embodiment of the disclosure can generate sound waves based on individual vibrations of each of the plurality of vibration generation regions in which the plurality of inorganic material portions 213a1 provided in the vibration generation portion 213 overlap with the plurality of first power electrodes 115, respectively.

[0437] Figure 22 A vibration generation part according to another embodiment of the disclosure shown in Figure 16 is illustrated.

[0438] Referring to Figure 22 , the vibration generation portion 213 of each of the first vibration structure 110 and the second vibration structure 130 according to another embodiment of the disclosure can include the plurality of inorganic material portions 213a1 and the flexible portion 213a2 provided between the plurality of inorganic material portions 213a1.

[0439] The plurality of inorganic material portions 213a1 can be provided spaced apart from each other in each of the first direction X and the second direction Y. For example, each of the plurality of inorganic material portions 213a1 can be arranged in a lattice shape to have a hexahedral shape having the same size. Each of the plurality of inorganic material portions (or the plurality of first portions) 213a1 can include the same material as the vibration portion 113a of each of the plurality of vibration generation portions described above with reference to Figure 3 , or can include the same material as each of the plurality of inorganic material portions 213a1 described above with reference to Figure 16 and Figure 17 , thus, repetitive description thereof can be omitted.

[0440] The vibration generation portion 213 can include a plurality of inorganic material portions 213a1 having a 1-3 type composite structure, and thus can have a resonance frequency of an inaudible frequency band as well as an audible frequency, but embodiments of the present disclosure are not limited thereto. For example, the resonance frequency of the vibration generation portion 213 can vary based on one or more of a length and a thickness of each of the inorganic material portions 213a1.

[0441] The flexible portion 213a2 can be disposed between the plurality of inorganic material portions 213a1 in each of the first direction X and the second direction Y. The flexible portion 213a2 can be configured to fill a gap between adjacent inorganic material portions 213a1 or to surround each inorganic material portion 213a1, and thus the flexible portion 213a2 can be connected to or attached on the adjacent inorganic material portions 213a1. According to embodiments of the present disclosure, a width of the flexible portion 213a2 disposed between two inorganic material portions 213a1 adjacent to each other in the first direction X can be the same as or different from the inorganic material portions 213a1. A width of the flexible portion 213a2 disposed between two inorganic material portions 213a1 adjacent to each other in the second direction Y can be the same as or different from the inorganic material portions 213a1. The flexible portion 213a2 can include the same material as the flexible portion 213a2 described above with reference to FIGS. 1A and 1B, and thus the same reference numerals denote the same elements and repetitive descriptions thereof can be omitted. Figure 16 and Figure 17 The same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0442] Each of the plurality of inorganic material portions 213a1 disposed in the vibration generation portion 213 of the first vibration structure 110 and each of the plurality of inorganic material portions 213a1 disposed in the vibration generation portion 213 of the second vibration structure 130 can be overlapped with each other or can be stacked together without interleaving to vibrate in the same direction, and thus the amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 can be maximized. The sound pressure level characteristic of the sound generated based on the amplitude displacement of each of the first vibration structure 110 and the second vibration structure 130 and the sound characteristic of the mid-low tone sound band can be enhanced. Also, as Figures 1 to 5 the vibration device shown in FIGS. 1A and 1B, the vibration device including the vibration generation portion 213 according to another embodiment of the present disclosure can output a sound having directivity or a directivity angle, change a directivity direction of the sound and / or a directivity angle of the sound, output a sound having a minimum directivity angle (or directivity), and enhance each of a vibration characteristic, a reliability characteristic, and a sound output characteristic.

[0443] Figure 22The vibration generation part 213 according to another embodiment of the disclosure shown in FIG. 1 can be applied to Figure 18 at least one or more of the first vibration structure 110 shown in FIG. 1, Figure 19 the second vibration structure 130 shown in FIG. 1, Figure 20 the first vibration structure 110 shown in FIG. 1, and Figure 21 the second vibration structure 130 shown in FIG. 1. For example, Figures 18 to 21 at least one or more of the vibration generation part 213 shown in FIG. 1 can be replaced by Figure 22 the vibration generation part 213 shown in FIG. 1. For example, Figures 18 to 21 a part of the vibration generation part 213 shown in FIG. 1 can be replaced by Figure 22 the vibration generation part 213 shown in FIG. 1. For example, Figures 18 to 21 the vibration generation part 213 of the second vibration structure 130 shown in FIG. 1 can be replaced by Figure 22 the vibration generation part 213 shown in FIG. 1.

[0444] In the vibration generation part 213 according to another embodiment of the disclosure applied to Figure 20 and Figure 21 , the plurality of first power supply electrodes 115 can be spaced apart from each other in each of the first direction X and the second direction Y to overlap with the plurality of inorganic material parts 213a1, respectively. The plurality of first power supply electrodes 115 can be electrically connected in a one-to-one relationship and connected to the plurality of first power supply lines 117, respectively. Accordingly, the vibration generation part 213 according to another embodiment of the disclosure can generate a sharp and accurate sound wave based on individual vibration of each of the plurality of inorganic material parts 213a1 without noise caused by parasitic interference between the plurality of inorganic material parts 213a1.

[0445] Figure 23 a vibration device according to another embodiment of the disclosure is shown, Figure 24 a sound output of the vibration device shown in FIG. 1 is shown. Figure 23

[0446] Referring to Figure 23 and Figure 24 , the vibration device according to another embodiment of the disclosure can include the first vibration structure 110, the second vibration structure 130, and the third vibration structure 150.

[0447] ​The first vibration structure 110 can be a lower vibration structure, but embodiments of the present disclosure are not limited thereto. The second vibration structure 130 and the third vibration structure 150 can each be an upper vibration structure, but embodiments of the present disclosure are not limited thereto. For example, the second vibration structure 130 can be a first upper vibration structure, and the third vibration structure 150 can be a second upper vibration structure, but embodiments of the present disclosure are not limited thereto.

[0448] The first vibration structure 110 can vibrate based on a first vibration driving signal provided from a first amplifier of the vibration driving circuit to generate a first sound wave SW1. The first vibration structure 110 can be any one or more of the first vibration structures 110 described above with reference to FIGS. 1A and 1B, and thus repeated descriptions thereof can be omitted or will be briefly given below. Figures 1 to 22 The first vibration structure 110 can vibrate based on a first vibration driving signal provided from a first amplifier of the vibration driving circuit to generate a first sound wave SW1. The first vibration structure 110 can be any one or more of the first vibration structures 110 described above with reference to FIGS. 1A and 1B, and thus repeated descriptions thereof can be omitted or will be briefly given below.

[0449] The first vibration structure 110 can include a first area A1 and a second area A2.

[0450] The first area A1 can be located between the center line CL and one side (or a first portion) of the first vibration structure 110 with respect to the first direction X. The second area A2 can be located between the center line CL and the other side (or a second portion) of the first vibration structure 110 with respect to the first direction X. For example, the first area A1 can be a right area or a right half area of the first vibration structure 110. The second area A2 can be a left area or a left half area of the first vibration structure 110. For example, the first area A1 and the second area A2 of the first vibration structure 110 can be left-right symmetrical about the center line CL on the first direction X.

[0451] The second vibration structure 130 can overlap or be stacked at the first area A1 of the first vibration structure 110. The second vibration structure 130 can be implemented to have a size corresponding to the first area A1 of the first vibration structure 110. The second vibration structure 130 can vibrate based on a second vibration driving signal provided from a second amplifier of the vibration driving circuit to generate a second sound wave SW2. For example, the second sound wave SW2 can be different from the first sound wave SW1, but embodiments of the present disclosure are not limited thereto. Except that the second vibration structure 130 has a size corresponding to the first area A1 of the first vibration structure 110, the second vibration structure 130 can be any one or more of the second vibration structures 130 described above with reference to FIGS. 1A and 1B, and thus repeated descriptions thereof can be omitted or will be briefly given below. Figures 1 to 22 The second vibration structure 130 can overlap or be stacked at the first area A1 of the first vibration structure 110. The second vibration structure 130 can be implemented to have a size corresponding to the first area A1 of the first vibration structure 110. The second vibration structure 130 can vibrate based on a second vibration driving signal provided from a second amplifier of the vibration driving circuit to generate a second sound wave SW2. For example, the second sound wave SW2 can be different from the first sound wave SW1, but embodiments of the present disclosure are not limited thereto. Except that the second vibration structure 130 has a size corresponding to the first area A1 of the first vibration structure 110, the second vibration structure 130 can be any one or more of the second vibration structures 130 described above with reference to FIGS. 1A and 1B, and thus repeated descriptions thereof can be omitted or will be briefly given below.

[0452] The third vibration structure 150 can overlap or stack at the second area A2 of the first vibration structure 110. The third vibration structure 150 can be implemented to have a size corresponding to the second area A2 of the first vibration structure 110. The third vibration structure 150 can vibrate based on a third vibration driving signal provided from a third amplifier of the vibration driving circuit to generate a third sound wave SW3. For example, the third sound wave SW3 can be different from the second sound wave SW2, but embodiments of the present disclosure are not limited thereto. Except that the third vibration structure 150 has a size corresponding to the second area A2 of the first vibration structure 110, the third vibration structure 150 can be any one or more of the above-described second vibration structures 130, and thus repetitive descriptions thereof can be omitted or will be briefly given below. Figures 1 to 22 Any one or more of the described second vibration structures 130 can be described above, and thus repetitive descriptions thereof can be omitted or will be briefly given below.

[0453] According to embodiments of the present disclosure, each of the first, second, and third sound waves can be any one or more of an audible frequency, an ultrasonic wave of an inaudible frequency band, and an ultrasonic wave including an inaudible frequency band including an audible frequency.

[0454] According to embodiments of the present disclosure, the first sound wave SW1 generated in the first vibration structure 110 can be an ultrasonic wave (or a reference ultrasonic wave) of an inaudible frequency band, the second sound wave SW2 generated in the second vibration structure 130 can be an ultrasonic wave (or a first sound wave) including an audible frequency, and the third sound wave SW3 generated in the third vibration structure 150 can be an ultrasonic wave (or a second sound ultrasonic wave) including an audible frequency identical to or different from the second sound wave SW2. For example, the first sound wave SW1 can correspond to a first polarity signal and a second polarity signal of the first vibration driving signal. The second sound wave SW2 can correspond to a first polarity signal or a second polarity signal of the second vibration driving signal. The third sound wave SW3 can correspond to a first polarity signal or a second polarity signal of the third vibration driving signal. For example, the second sound wave SW2 and the third sound wave SW3 can have the same frequency (or resonance frequency), or can have different frequencies.

[0455] Each of the second vibration structure 130 and the third vibration structure 150 can be coupled to a front surface (or an upper surface) of the first vibration structure 110 through the adhesive member 120, and thus can overlap or stack with the first vibration structure 110.

[0456] In the vibration device according to another embodiment of the disclosure, the first vibration structure 110, the second vibration structure 130, and the third vibration structure 150 can be displaced (or driven or vibrated) in the same direction and can be overlapped or stacked with each other without being interleaved, and thus the amplitude displacement of each of the first vibration structure 110, the second vibration structure 130, and the third vibration structure 150 can be maximized. Accordingly, the vibration device according to another embodiment of the disclosure can output sound having an enhanced sound pressure level characteristic of a mid-low pitch sound band, or can output sound having directivity or a direct angle.

[0457] Further, when a beat phenomenon occurs between the first to third sound waves SW1 to SW3 output based on the vibrations of the first vibration structure 110, the second vibration structure 130, and the third vibration structure 150, the vibration device according to another embodiment of the disclosure can output sound having directivity or a direct angle in a specific direction. For example, based on a beat phenomenon forming an envelope of an audible frequency corresponding to a difference between the first sound wave SW1 and the second sound wave SW2, an overlapping region between the first sound wave SW1 and the second sound wave SW2 can form a first audible region enabling a user to hear sound. Further, based on a beat phenomenon forming an envelope of an audible frequency corresponding to a difference between the first sound wave SW1 and the third sound wave SW3, an overlapping region between the first sound wave SW1 and the third sound wave SW3 can form a second audible region enabling a user to hear sound. Accordingly, the vibration device according to another embodiment of the disclosure can output sound having directivity or a direct angle in a specific direction through the overlapping region between the first sound wave SW1 and the second sound wave SW2 and the overlapping region between the first sound wave SW1 and the third sound wave SW3.

[0458] In the vibration device according to another embodiment of the disclosure, the second vibration structure 130 can vibrate based on a first polarity signal of the second vibration driving signal to output the second sound wave SW2, and the third vibration structure 150 can vibrate based on a second polarity signal of the third vibration driving signal to output the third sound wave SW3, and thus based on an envelope formed in the second region A2 of the first vibration structure 110, an audible region of the second region A2 of the first vibration structure 110 can be formed.

[0459] In the vibration device according to another embodiment of the disclosure, the second vibration structure 130 can vibrate based on a second polarity signal of the second vibration driving signal to output the second sound wave SW2, and the third vibration structure 150 can vibrate based on a first polarity signal of the third vibration driving signal to output the third sound wave SW3, and thus based on an envelope formed in the first region A1 of the first vibration structure 110, an audible region of the first region A1 of the first vibration structure 110 can be formed.

[0460] Figure 25A vibration device according to another embodiment of the disclosure is illustrated, Figure 26 is a cross-sectional view taken along Figure 25 line II-II' shown in FIG. 1, Figure 27 illustrates Figure 25 and Figure 26 a first vibration structure shown in FIG. 1, Figure 28 illustrates Figure 25 and Figure 26 a second vibration structure shown in FIG. 1, Figure 29 illustrates Figure 25 and Figure 26 a third vibration structure shown in FIG. 1.

[0461] Referring to Figure 25 and Figure 26 , a vibration device according to another embodiment of the disclosure can include a first vibration structure 310, a second vibration structure 330, and a third vibration structure 350.

[0462] The first vibration structure 310 can be a lower vibration structure, but embodiments of the disclosure are not limited thereto. The second vibration structure 330 can be an intermediate vibration structure, but embodiments of the disclosure are not limited thereto. The third vibration structure 350 can be an upper vibration structure, but embodiments of the disclosure are not limited thereto.

[0463] Each of the first vibration structure 310, the second vibration structure 330, and the third vibration structure 350 can have a circular shape (or an elliptical shape) and can overlap or stack each other. Each of the first vibration structure 310, the first vibration structure 330, and the third vibration structure 350 can have the same shape or the same size. The first vibration structure 310, the first vibration structure 330, and the third vibration structure 350 can be implemented to be displaced or vibrated in the same direction.

[0464] The first vibration structure 310 can generate or output a first sound wave. The second vibration structure 330 can generate or output a second sound wave different from the first sound wave. The third vibration structure 350 can generate or output a third sound wave the same as or different from the second sound wave. According to embodiments of the disclosure, each of the first sound wave, the second sound wave, and the third sound wave can be any one or more of an audible frequency, an ultrasonic wave of an inaudible frequency band having no audible frequency, and an ultrasonic wave including an inaudible frequency band having an audible frequency.

[0465] According to embodiments of the disclosure, the first vibration structure 310 can generate or output the first sound wave SW1 in the entire area, but embodiments of the disclosure are not limited thereto. The second vibration structure 330 can generate or output the second sound wave SW2 on a peripheral portion of the first vibration structure 310. The third vibration structure 350 can generate or output the third sound wave SW3 on a peripheral portion of the second vibration structure 330.

[0466] According to embodiments of the present disclosure, the first sound wave SW1 generated in the first vibration structure 310 can be an ultrasonic wave (or a reference ultrasonic wave) of an inaudible band, the second sound wave SW2 generated in the second vibration structure 330 can be an ultrasonic wave (or a first sound wave) including an audible frequency, and the third sound wave SW3 generated in the third vibration structure 350 can be an ultrasonic wave (or a second sound ultrasonic wave) including an audible frequency. For example, the first sound wave SW1 can correspond to a first polarity signal and a second polarity signal of the first vibration driving signal. The second sound wave SW2 can correspond to a first polarity signal or a second polarity signal of the second vibration driving signal. The third sound wave SW3 can correspond to a first polarity signal or a second polarity signal of the third vibration driving signal. For example, the second sound wave SW2 and the third sound wave SW3 can have the same frequency (or resonance frequency), or can have different frequencies.

[0467] The vibration device according to another embodiment of the present disclosure can further include a first adhesive member 320 and a second adhesive member 340.

[0468] The first adhesive member 320 can be disposed or inserted between the first vibration structure 310 and the second vibration structure 330. The first adhesive member 320 can be the same as the adhesive member 120 described above with reference to Figure 3 , and thus, repetitive description thereof can be omitted.

[0469] The second adhesive member 340 can be disposed or inserted between the second vibration structure 330 and the third vibration structure 350. The second adhesive member 340 can be the same as the adhesive member 120 described above with reference to Figure 3 , and thus, repetitive description thereof can be omitted.

[0470] Referring to Figures 25 to 27 , the first vibration structure 310 according to an embodiment of the present disclosure can include a first base member 311, a second base member 312, and a vibration generation portion 313.

[0471] The first base member 311 and the second base member 312 can be disposed to overlap each other. Except that each of the first base member 311 and the second base member 312 has a circular plate shape, the first base member 311 and the second base member 312 can be the same as the first base member 111 or the second base member 112 of the first vibration structure 110 described above with reference to Figure 3 and Figure 4 , and thus, repetitive description thereof can be omitted or will be given below.

[0472] The vibration generation portion (or first vibration generation portion) 313 can be disposed or inserted between the first base member 311 and the second base member 312. The vibration generation portion 313 can have a circular shape, but embodiments of the present disclosure are not limited thereto, and can have an elliptical shape.

[0473] The vibration generation portion 313 according to an embodiment of the present disclosure can include a vibration portion 313a including a piezoelectric material, a first electrode layer 313b disposed at a first surface of the vibration portion 313a, and a second electrode layer 313c disposed at a second surface of the vibration portion 313a opposite or different from the first surface.

[0474] The vibration portion 313a can include the same piezoelectric material as the vibration portion 113a of the first vibration structure 110 described above with reference to FIGS. 1 to 3, except that the vibration portion 313a has a circular shape (or an elliptical shape), and thus repetitive description thereof can be omitted. Figure 3 and Figure 4 The vibration portion 313a can include the same piezoelectric material as the vibration portion 113a of the first vibration structure 110 described above with reference to FIGS. 1 to 3, except that the vibration portion 313a has a circular shape (or an elliptical shape), and thus repetitive description thereof can be omitted.

[0475] The first electrode layer 313b can be disposed between the vibration portion 313a and the first base member 311. The first electrode layer 313b can be electrically connected and directly connected to the first surface of the vibration portion 313a. For example, the first electrode layer 313b can have the same shape as the vibration portion 313a, but embodiments of the present disclosure are not limited thereto.

[0476] The second electrode layer 313c can be disposed between the vibration portion 313a and the second base member 312. The second electrode layer 313c can be electrically connected and directly connected to the second surface of the vibration portion 313a. For example, the second electrode layer 313c can have the same shape as the vibration portion 313a, but embodiments of the present disclosure are not limited thereto.

[0477] The first vibration structure 310 according to an embodiment of the present disclosure can further include an adhesive layer 314 disposed between the first base member 311 and the second base member 312 to surround a side surface (or a side wall) of the vibration generation portion 313.

[0478] The adhesive layer 314 according to an embodiment of the present disclosure can include a first adhesive layer 314a disposed at a second surface (or a rear surface) of the first base member 311 and a second adhesive layer 314b disposed at a first surface (or an upper surface) of the second base member 312. The first adhesive layer 314a and the second adhesive layer 314b can be coupled or bonded to each other between the first base member 311 and the second base member 312, and can be implemented as one adhesive layer. The first adhesive layer 314a or the second adhesive layer 314b can be omitted.

[0479] The first vibration structure 310 according to the embodiment of the disclosure can further include a plurality of first power electrodes 315 and a plurality of second power electrodes 316.

[0480] The first power electrodes 315 can be disposed between the vibration generation part 313 and the first base member 311, and can be electrically connected to the first electrode layer 313b of the vibration generation part 313. The first power electrodes 315 can be disposed at the second surface (or rear surface) of the first base member 311. For example, the first power electrodes 315 can have the same circular shape (or elliptical shape) as the vibration generation part 313.

[0481] The first power electrodes 315 can be electrically connected to the first electrode layer 313b of the vibration generation part 313 through an anisotropic conductive film, or can be electrically connected to the first electrode layer 313b of the vibration generation part 313 through conductive materials (or particles) included in the adhesive layer 314 (or the first adhesive layer 314a).

[0482] The second power electrodes 316 can be disposed between the vibration generation part 313 and the second base member 312, and can be electrically connected to the second electrode layer 313c of the vibration generation part 313. The second power electrodes 316 can be disposed at the first surface (or front surface) of the second base member 312. For example, the second power electrodes 316 can have the same circular shape (or elliptical shape) as the vibration generation part 313.

[0483] The second power electrodes 316 can be electrically connected to the second electrode layer 313c of the vibration generation part 313 through an anisotropic conductive film, or can be electrically connected to the second electrode layer 313c of the vibration generation part 313 through conductive materials (or particles) included in the adhesive layer 314 (or the second adhesive layer 314b).

[0484] The first vibration structure 310 according to the embodiment of the disclosure can include a plurality of first power lines 317, a plurality of second power lines 318, and a pad part 319.

[0485] The first power lines 317 can be electrically connected to the first power electrodes 315. The first power lines 317 can be directly formed at the second surface (or rear surface) of the first base member 311 together with the first power electrodes 315.

[0486] The second power lines 318 can be electrically connected to the second power electrodes 316. The second power lines 318 can be directly formed at the first surface (or front surface) of the second base member 312 together with the second power electrodes 316.

[0487] The pad portion 319 (or a first pad portion) can be disposed at a first outer circumferential portion of a second surface outer circumferential portion of the first base member 111 and a first outer circumferential portion of a first surface outer circumferential portion of the second base member 112.

[0488] The pad portion 319 according to the embodiment of the disclosure can include a plurality of first pads 319a disposed in parallel at a first circumferential portion of a second surface circumferential portion of the first base member 311 and a plurality of second pads 319b disposed in parallel at a first circumferential portion of a first surface circumferential portion of the second base member 312.

[0489] The first pad 319a can be electrically connected to an end portion (or one side) of the first power supply line 317. Accordingly, the first pad 319a can be electrically connected to the first power supply electrode 315 through the first power supply line 317.

[0490] The second pad 319b can be electrically connected to an end portion of the second power supply line 318. Accordingly, the second pad 319b can be electrically connected to the second power supply electrode 316 through the second power supply line 318.

[0491] The first vibration structure 110 according to the embodiment of the disclosure can further include a flexible cable FC1. The flexible cable FC1 can be electrically connected to the pad portion 319. Accordingly, the flexible cable FC1 can supply a first vibration driving signal, which is supplied from the first amplifier of the vibration driving circuit, to the corresponding pad portion 319.

[0492] As described above, the first vibration structure 110 according to the embodiment of the disclosure can vibrate or displace based on the first vibration driving signal supplied from the first amplifier of the vibration driving circuit to the first electrode layer 313b and the second electrode layer 313c of the vibration generation portion 313 through the flexible cable FC1 and the pad portion 319, thereby generating or outputting the first sound wave.

[0493] Referring to Figure 25 , Figure 26 and Figure 27 , the second vibration structure 330 according to another embodiment of the disclosure can include a first base member 331, a second base member 332, and a vibration generation portion 333.

[0494] The first base member 331 and the second base member 332 can be disposed to overlap each other. Each of the first base member 331 and the second base member 332 can be the same as the first base member 311 or the second base member 312 described above with reference to Figure 25 and Figure 27 , and thus the same reference numerals denote the same elements, and a repeated description thereof can be omitted or will be briefly given below.

[0495] According to embodiments of the present disclosure, any one or more of the first base member 331 and the second base member 332 can be coupled or connected to the first vibration structure 310 by the first adhesive member 320. For example, the second surface (or rear surface) of the second base member 332 can be coupled or connected to the first base member 311 of the first vibration structure 310 by the first adhesive member 320. For example, the first surface (or front surface) of the first base member 331 can be coupled or connected to the first base member 311 of the first vibration structure 310 by the first adhesive member 320.

[0496] The vibration generation portion (or second vibration generation portion) 333 can be disposed or inserted between the first base member 331 and the second base member 332. The vibration generation portion 333 can have a circular band shape or a ring shape having an open portion (or hollow portion), but embodiments of the present disclosure are not limited thereto, and can have an elliptical band shape or an elliptical ring shape.

[0497] The vibration generation portion 333 can overlap with a peripheral portion of the vibration generation portion 313 disposed in the first vibration structure 310. According to embodiments of the present disclosure, the vibration generation portion 333 can overlap with a peripheral portion of the vibration generation portion 313 disposed in the first vibration structure 310, except for a central region. Accordingly, the vibration generation portion 333 of the second vibration structure 330 and the vibration generation portion 313 of the first vibration structure 310 can overlap or stack to be displaced (or driven or vibrated) in the same direction.

[0498] The vibration generation portion 333 according to embodiments of the present disclosure can include a vibration portion 333a including a piezoelectric material, a first electrode layer 333b disposed at a first surface of the vibration portion 333a, and a second electrode layer 333c disposed at a second surface of the vibration portion 333a opposite or different from the first surface.

[0499] The vibration portion 333a can include the same piezoelectric material as the vibration portion 313a of the first vibration structure 310 described above with reference to FIGS. 11A and 11B, except that the vibration portion 333a has a circular band shape (or an elliptical band shape), and thus repetitive description thereof can be omitted. Figure 26 and Figure 27 The vibration portion 333a can include the same piezoelectric material as the vibration portion 313a of the first vibration structure 310 described above with reference to FIGS. 11A and 11B, except that the vibration portion 333a has a circular band shape (or an elliptical band shape), and thus repetitive description thereof can be omitted.

[0500] The first electrode layer 333b can be disposed between the vibration portion 333a and the first base member 331. The first electrode layer 333b can be electrically connected and directly connected to the first surface of the vibration portion 333a. For example, the first electrode layer 333b can have the same shape as the vibration portion 333a, but embodiments of the present disclosure are not limited thereto.

[0501] The second electrode layer 333c can be disposed between the vibration portion 333a and the second base member 332. The second electrode layer 333c can be electrically connected and directly connected to the second surface of the vibration portion 333a. For example, the second electrode layer 333c can have the same shape as the vibration portion 333a, but embodiments of the present disclosure are not limited thereto.

[0502] The first vibration structure 330 according to an embodiment of the present disclosure can further include an adhesive layer 334 disposed between the first base member 331 and the second base member 332 to surround a side surface (or a side wall) of the vibration generation portion 333.

[0503] The adhesive layer 334 according to an embodiment of the present disclosure can include a first adhesive layer 334a disposed at the second surface (or the rear surface) of the first base member 331 and a second adhesive layer 334b disposed at the first surface (or the upper surface) of the second base member 332. The first adhesive layer 334a and the second adhesive layer 334b can be coupled or bonded to each other between the first base member 331 and the second base member 332, and can be implemented as one adhesive layer. The first adhesive layer 334a or the second adhesive layer 334b can be omitted.

[0504] The second vibration structure 330 according to an embodiment of the present disclosure can further include a first power electrode 335 and a second power electrode 336.

[0505] The first power electrode 335 can be disposed between the vibration generation portion 333 and the first base member 331, and can be electrically connected to the first electrode layer 333b of the vibration generation portion 333. The first power electrode 335 can be disposed at the second surface (or the rear surface) of the first base member 331. For example, the first power electrode 335 can have the same circular band shape (or the elliptical band shape) as the vibration generation portion 333.

[0506] The first power electrode 335 can be electrically connected to the first electrode layer 333b of the vibration generation portion 333 through an anisotropic conductive film, or can be electrically connected to the first electrode layer 333b of the vibration generation portion 333 through a conductive material (or a particle) included in the adhesive layer 334 (or the first adhesive layer 334a).

[0507] The second power electrode 336 can be disposed between the vibration generation portion 333 and the second base member 332, and can be electrically connected to the second electrode layer 333c of the vibration generation portion 333. The second power electrode 336 can be disposed at the first surface (or the front surface) of the second base member 332. For example, the second power electrode 336 can have the same circular band shape (or the elliptical band shape) as the vibration generation portion 333.

[0508] The second power electrode 336 can be electrically connected to the second electrode layer 333c of the vibration generation part 333 through an anisotropic conductive film, or can be electrically connected to the second electrode layer 333c of the vibration generation part 333 through a conductive material (or particles) included in the adhesive layer 334 (or the second adhesive layer 334b).

[0509] The second vibration structure 330 according to the embodiment of the disclosure can further include a first power line 337, a second power line 338, and a pad part 339.

[0510] The first power line 337 can be electrically connected to the first power electrode 335. The first power line 337 can be directly formed at the second surface (or the rear surface) of the first base member 331 together with the first power electrode 335.

[0511] The second power line 338 can be electrically connected to the second power electrode 336. The second power line 338 can be directly formed at the first surface (or the front surface) of the second base member 332 together with the second power electrode 336.

[0512] The pad part 339 (or the second pad part) can be disposed at the first outer circumferential part of the second surface circumferential part of the first base member 331 and the first outer circumferential part of the first surface circumferential part of the second base member 332.

[0513] The pad part 339 according to the embodiment of the disclosure can include a first pad 339a disposed at the first circumferential part of the second surface circumferential part of the first base member 331 and a second pad 339b disposed at the first circumferential part of the first surface circumferential part of the second base member 332.

[0514] The first pad 339a can be electrically connected to an end (or one side) of the first power line 337. Accordingly, the first pad 339a can be electrically connected to the first power electrode 335 through the first power line 337.

[0515] The second pad 339b can be electrically connected to an end of the second power line 338. Accordingly, the second pad 339b can be electrically connected to the second power electrode 336 through the second power line 338.

[0516] The second vibration structure 330 according to the embodiment of the disclosure can further include a flexible cable FC. The flexible cable FC2 can be electrically connected to the pad part 339. Accordingly, the flexible cable FC2 can supply a second vibration driving signal supplied from a second amplifier of a vibration driving circuit to the corresponding pad part 339.

[0517] As described above, the second vibration structure 330 according to the embodiment of the disclosure can vibrate or displace based on the second vibration driving signal provided from the second amplifier of the vibration driving circuit through the flexible cable FC2 and the pad portion 339 to the first electrode layer 333b and the second electrode layer 333c of the vibration generation portion 333, thereby generating or outputting the second acoustic wave. For example, the second acoustic wave output from the second vibration structure 330 can overlap with the first acoustic wave output from the peripheral portion of the first vibration structure 310.

[0518] Referring to Figure 25 , Figure 26 and Figure 29 , the third vibration structure 350 according to the embodiment of the disclosure can include a first base member 351, a second base member 352, and a vibration generation portion 353.

[0519] The first base member 351 and the second base member 352 can be disposed to overlap with each other. Each of the first base member 351 and the second base member 352 can be the same as the first base member 311 or the second base member 312 of the first vibration structure 310 described above with reference to Figure 25 and Figure 27 , and thus the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted or will be briefly given below.

[0520] According to the embodiment of the disclosure, any one or more of the first base member 351 and the second base member 352 can be coupled or connected to the second vibration structure 330 by the second adhesive member 340. For example, the second surface (or rear surface) of the second base member 352 can be coupled or connected to the first base member 331 of the second vibration structure 330 by the second adhesive member 340. For example, the first surface (or front surface) of the first base member 351 can be coupled or connected to the first base member 331 of the second vibration structure 330 by the second adhesive member 340.

[0521] The vibration generation portion (or third vibration generation portion) 353 can be disposed or inserted between the first base member 351 and the second base member 352. The vibration generation portion 353 can have a circular band shape or a ring shape having an open portion (or hollow portion), but is not limited thereto, and can have an elliptical band shape or an elliptical ring shape.

[0522] The vibration generation portion 353 can overlap with a peripheral portion of the vibration generation portion 333 disposed in the second vibration structure 330. Accordingly, the vibration generation portion 353 of the third vibration structure 350 and the vibration generation portion 333 of the second vibration structure 330 can overlap or stack to displace (or drive or vibrate) in the same direction. Accordingly, the vibration generation portions 313, 333, and 353 of the first vibration structure 310, the second vibration structure 330, and the third vibration structure 350 can overlap or stack to displace (or drive or vibrate) in the same direction.

[0523] The vibration generation portion 353 according to the embodiment of the disclosure can include a vibration portion 353a including a piezoelectric material, a first electrode layer 353b disposed at a first surface of the vibration portion 353a, and a second electrode layer 353c disposed at a second surface of the vibration portion 353a opposite or different from the first surface.

[0524] The vibration portion 353a can include the same piezoelectric material as each of the vibration portions 313a and 333a of the first vibration structure 310 described above with reference to FIGS. 11A and 11B, and thus, repetitive description thereof can be omitted. Figure 27 and Figure 28 The vibration portion 353a can include the same piezoelectric material as each of the vibration portions 313a and 333a of the first vibration structure 310 described above with reference to FIGS. 11A and 11B, and thus, repetitive description thereof can be omitted.

[0525] The first electrode layer 353b can be disposed between the vibration portion 353a and the first base member 351. The first electrode layer 353b can be electrically connected and directly connected to the first surface of the vibration portion 353a. For example, the first electrode layer 353b can have the same shape as the vibration portion 353a, but embodiments of the disclosure are not limited thereto.

[0526] The second electrode layer 353c can be disposed between the vibration portion 353a and the second base member 352. The second electrode layer 353c can be electrically connected and directly connected to the second surface of the vibration portion 353a. For example, the second electrode layer 353c can have the same shape as the vibration portion 353a, but embodiments of the disclosure are not limited thereto.

[0527] The third vibration structure 350 according to the embodiment of the disclosure can further include an adhesive layer 354 disposed between the first base member 351 and the second base member 352 to surround a side surface (or a side wall) of the vibration generation portion 353.

[0528] The adhesive layer 354 according to embodiments of the present disclosure may include a first adhesive layer 354a disposed on a second surface (or rear surface) of the first base member 351 and a second adhesive layer 354b disposed on a first surface (or upper surface) of the second base member 352. The first adhesive layer 354a and the second adhesive layer 354b may be connected or bonded to each other between the first base member 351 and the second base member 352, and may be implemented as a single adhesive layer. Either the first adhesive layer 354a or the second adhesive layer 354b may be omitted.

[0529] The third vibration structure 350 according to the embodiments of this disclosure may further include a first power electrode 355, a second power electrode 356, a first power line 357, a second power line 358, a pad portion 359, and a flexible cable FC3. Additional components of the third vibration structure 350 may be as described above. Figure 26 and Figure 27 The first power electrode 335, the second power electrode 336, the first power line 337, the second power line 338, the pad portion 339, and the flexible cable FC2 are described. Therefore, the same reference numerals denote the same components, and their repeated descriptions can be omitted.

[0530] As described above, the third vibration structure 350 according to the present disclosure can vibrate or displace based on a second vibration drive signal provided from the third amplifier of the vibration drive circuit to the first electrode layer 353b and the second electrode layer 353c of the vibration generation section 353 via the flexible cable FC3 and the pad portion 359, thereby generating or outputting a third sound wave. For example, the third sound wave output from the third vibration structure 350 can overlap with each of the first sound wave output from the peripheral portion of the first vibration structure 310 and the second sound wave output from the peripheral portion of the second vibration structure 330.

[0531] In another embodiment of the vibration device according to this disclosure, the first vibration structure 310, the second vibration structure 330, and the third vibration structure 350 can be displaced (or driven or vibrated) in the same direction, and can overlap or stack on top of each other without intersecting. Therefore, the amplitude displacement of each of the first vibration structure 310, the second vibration structure 330, and the third vibration structure 350 can be maximized. Thus, the vibration device according to another embodiment of this disclosure can output sound with enhanced sound pressure level characteristics of mid-to-low pitch vocal bands, or it can output sound with directional or directional angles.

[0532] In addition, such as Figure 30As shown, when a beat frequency phenomenon occurs between the first to third sound waves SW1 to SW3 output based on the vibrations of the first vibration structure 310, the second vibration structure 330, and the third vibration structure 350, the vibration device according to another embodiment of the present disclosure can output sound with directionality or angularity in a specific direction. For example, based on the beat frequency phenomenon that forms an envelope of audible frequencies corresponding to the difference between the first sound wave SW1 and the second sound wave SW2, the overlapping region between the first sound wave SW1 and the second sound wave SW2 can form a first audible region where the user can hear the sound. Furthermore, based on the beat frequency phenomenon that forms an envelope of audible frequencies corresponding to the difference between the first sound wave SW1 and the third sound wave SW3, the overlapping region between the first sound wave SW1 and the third sound wave SW3 can form a second audible region where the user can hear the sound. Therefore, the vibration device according to another embodiment of the present disclosure can output sound with directionality or angularity in a specific direction through the overlapping regions between the first sound wave SW1 and the second sound wave SW2 and the overlapping regions between the first sound wave SW1 and the third sound wave SW3.

[0533] Figure 31 A vibration device according to another embodiment of the present disclosure is shown. Figure 32 It is along Figure 31 The cross-sectional view taken by line III-III' shown in the figure. Figure 33 It shows Figure 31 and Figure 32 The second vibration structure shown is a plan view of the second vibration structure. Figure 34 It shows Figure 32 and Figure 33 The diagram shows a cross-sectional view of the part that generates the vibration.

[0534] Figures 31 to 34 This shows how to modify the reference above. Figures 1 to 4 The described embodiment is implemented using a second vibrating structure in the vibrating device. In the following description, the same reference numerals denote the same elements, except for the first vibrating structure and its associated elements, and repeated descriptions may be omitted or will be briefly given below.

[0535] Reference Figures 31 to 34 In another embodiment of the vibration device according to this disclosure, the second vibration structure 430 may be implemented to output directional sound waves (or second sound waves) that are directional in a specific direction. For example, the second vibration structure 430 may be implemented to output directional sound waves toward the center portion of the vibration device, rather than parallel to the front surface of the vibration device.

[0536] The second vibration structure 430 according to an embodiment of the present disclosure may include a first base member 111, a second base member 112, and a plurality of vibration generating portions 433.

[0537] The first base member 111 and the second base member 112 can be disposed to overlap each other. Each of the first base member 111 and the second base member 112 can be the same as the first base member 111 or the second base member 112 of the first vibration structure 110 described above with reference to Figure 3 and Figure 4 Therefore, repetitive descriptions thereof can be omitted or will be briefly given below.

[0538] The first base member 111 and the second base member 112 can be bonded to each other with the adhesive layer 114, and have a plurality of vibration generation portions 433 between the first base member 111 and the second base member 112.

[0539] Each of the plurality of vibration generation portions 433 can be disposed or inserted between the first base member 111 and the second base member 112. Each of the plurality of vibration generation portions 433 can include an inclined surface inclined in a specific direction. Each of the plurality of vibration generation portions 433 can generate a directional sound wave in a specific direction through the inclined surface. For example, each of the plurality of vibration generation portions 433 can have an orientation in which a sound wave generated based on vibration (or displacement or driving) is output in a forward direction of a central portion of the vibration device.

[0540] Each of the plurality of vibration generation portions 433 according to the embodiment of the disclosure can include a vibration portion 433a including a piezoelectric material, a first electrode layer 433b disposed at a first surface of the vibration portion 433a, and a second electrode layer 433c disposed at a second surface of the vibration portion 433a.

[0541] The vibration portion 433a can include the same piezoelectric material as the vibration portion 113a described above with reference to Figure 3 Therefore, repetitive descriptions thereof can be omitted or will be briefly given below.

[0542] Referring to Figure 34 , the vibration portion 433a according to the embodiment of the disclosure can include a first surface 433s1 having an inclined surface structure and a second surface 433s2 having a planar structure.

[0543] The second surface 433s2 of the vibration portion 433a can include a flat surface or a flat surface. For example, the second surface 433s2 of the vibration portion 433a can be parallel to a first surface (or an upper surface) of the second base member 112.

[0544] The first surface 433s1 of the vibration portion 433a can have a slanted surface structure slanted with respect to the first direction X from both ends EP1 and EP2 of the vibration portion 433a toward the center line CL. The distance (or thickness) between the first surface 433s1 and the second surface 433s2 of the vibration portion 433a can gradually decrease in a direction from both ends (or both sides) to the center line.

[0545] The first surface 433s1 of the vibration portion 433a according to the embodiment of the disclosure can include a first slanted surface IS1 and a second slanted surface IS2 slanted to have a predetermined slope. For example, the first surface 433s1 of the vibration portion 433a can include the first slanted surface IS1 and the second slanted surface IS2 formed by using a molding process of a piezoelectric material.

[0546] The first slanted surface IS1 can be implemented in a region A1 between the center line CL and a first side (or one end) of the vibration portion 433a of the first surface 433s1 of the vibration portion 433a with respect to the first direction X.

[0547] According to the embodiment of the disclosure, in the vibration portion 433a, a first included angle θ1 between the first slanted surface IS1 and the second surface 433s2 can be an acute angle. For example, the first included angle θ1 between the first slanted surface IS1 and the second surface 433s2 can be set to a range of 10 degrees to 75 degrees, but the embodiment of the disclosure is not limited thereto. For example, the first included angle θ1 can be set based on a focal distance of beamforming of a directional acoustic wave and / or a directional angle of an acoustic wave having directionality.

[0548] According to the embodiment of the disclosure, the height of the first slanted surface IS1 can gradually decrease in a direction from the first side (or one end) of the vibration portion 433a to the center line CL with respect to the first direction X. The first slanted surface IS1 can be slanted with respect to the second surface 433s2, and thus, the distance or thickness between the first slanted surface IS1 and the second surface 433s2 with respect to the thickness direction Z of the vibration device can gradually decrease in a direction from the first side (or one end) of the vibration portion 433a to the center line CL.

[0549] The second slanted surface IS2 can be implemented in a region A2 between the center line CL and a second side (or the other end) of the vibration portion 433a of the first surface 433s1 of the vibration portion 433a with respect to the first direction X.

[0550] According to an embodiment of the disclosure, in the vibration portion 433a, a second included angle θ2 between the second inclined surface IS2 and the second surface 433s2 can be an acute angle. For example, the second included angle θ2 between the second inclined surface IS2 and the second surface 433s2 can be set to a range of 10 degrees to 75 degrees, but embodiments of the disclosure are not limited thereto. For example, the second included angle θ2 can be set based on a focal length of beamforming of a directional acoustic wave and / or a directional angle of an acoustic wave having directivity.

[0551] According to an embodiment of the disclosure, a height of the second inclined surface IS2 can gradually decrease in a direction from a first side (or one end) of the vibration portion 433a to the center line CL with respect to the first direction X. For example, the second inclined surface IS2 can be inclined with respect to the second surface 433s2, and thus, a distance or a thickness between the second inclined surface IS2 and the second surface 433s2 with respect to the thickness direction Z of the vibration device can gradually decrease in a direction from a second side (or one end) of the vibration portion 433a to the center line CL.

[0552] According to an embodiment of the disclosure, a first included angle θ1 between the first inclined surface IS1 and the second surface 433s2 can be the same as a second included angle θ2 between the second inclined surface IS2 and the second surface 433s2. For example, within an error range of a manufacturing process, the first included angle θ1 between the first inclined surface IS1 and the second surface 433s2 can be the same as the second included angle θ2 between the second inclined surface IS2 and the second surface 433s2. Thus, the vibration portion 433a can have a structure symmetrical with respect to the center line CL in the first direction X.

[0553] According to another embodiment of the disclosure, a first included angle θ1 between the first inclined surface IS1 and the second surface 433s2 can be different from a second included angle θ2 between the second inclined surface IS2 and the second surface 433s2. Thus, the vibration portion 433a can have a structure asymmetrical with respect to the center line CL in the first direction X.

[0554] The first electrode layer 433b can be disposed at the first surface 433s1 of the vibration portion 433a. The first electrode layer 433b can directly contact the first surface 433s1 of the vibration portion 433a, and thus, the first electrode layer 433b can include an inclined surface inclined at the same inclination as the first surface 433s1 of the vibration portion 433a. Except that the first electrode layer 433b includes the inclined surface, the first electrode layer 433b can be substantially the same as the first electrode layer 113b described above with reference to FIG. 1, and thus, repetitive description thereof can be omitted. Figure 3 The first electrode layer 433b can be disposed at the first surface 433s1 of the vibration portion 433a. The first electrode layer 433b can directly contact the first surface 433s1 of the vibration portion 433a, and thus, the first electrode layer 433b can include an inclined surface inclined at the same inclination as the first surface 433s1 of the vibration portion 433a. Except that the first electrode layer 433b includes the inclined surface, the first electrode layer 433b can be substantially the same as the first electrode layer 113b described above with reference to FIG. 1, and thus, repetitive description thereof can be omitted.

[0555] The second electrode layer 433c can be disposed at the second surface 433s2 of the vibration portion 433a. The second electrode layer 433c can directly contact the second surface 433s2 of the vibration portion 433a, and thus, the second electrode layer 433c can have the same planar structure as the second surface 433s2 of the vibration portion 433a. The second electrode layer 433c can be substantially the same as described above with reference to the second electrode layer 113c, and thus, repetitive description thereof can be omitted. Figure 3 The second electrode layer 113c described above is substantially the same, and thus, repetitive description thereof can be omitted.

[0556] The vibration portion 433a of each of the plurality of vibration generation portions 433 can vibrate based on the second vibration driving signal supplied to the first electrode layer 433b and the second electrode layer 433c to generate a directional sound wave propagating toward the center line CL of the vibration device. For example, the directional sound wave can be output in a direction parallel to the inclined surface of the vibration portion 433a, and thus, the directional sound wave can have directivity concentrated on a forward region away from the center line CL of the vibration device.

[0557] The second vibration structure 430 according to the embodiment of the disclosure can further include an adhesive layer 114 disposed between the first base member 111 and the second base member 112 to surround the side surface (or side wall) of each of the plurality of vibration generation portions 433, a plurality of first power electrodes 115 electrically connected to the first electrode layer 433b of each of the plurality of vibration generation portions 433, a plurality of first power lines 117 electrically connected to the plurality of first power electrodes 115, a plurality of second power electrodes 116 electrically connected to the second electrode layer 213c of each of the plurality of vibration generation portions 433, a plurality of second power lines 118 electrically connected to the plurality of second power electrodes 116, a pad portion 119 electrically connected to each of the plurality of first power lines 117 and the plurality of second power lines 118, and a flexible cable FC electrically connected to the pad portion 119. The added elements of the second vibration structure 430 can be substantially the same as described above with reference to the second vibration structure 130, and thus, the same reference numerals denote the same elements, and repetitive description thereof can be omitted. Figure 3 and Figure 5 The same, and thus, repetitive description thereof can be omitted.

[0558] As described above, in the vibration device according to another embodiment of the disclosure, as Figure 35As illustrated, the second vibration structure 430 and the first vibration structure 110 can overlap each other or can be stacked with each other, and the vibration device can output sound having directivity or a directivity angle based on the first sound wave SW1 generated from the first vibration structure 110 and the directional sound wave (or second sound wave) SW2 generated from the second vibration structure 430. Accordingly, in the vibration device according to another embodiment of the disclosure, based on a beat phenomenon between the first sound wave SW1 and the directional sound wave SW2, an overlapping area between the first sound wave SW1 and the directional sound wave SW2 can form (or implement) an audible area that enables a user to listen to sound, and an area outside a focal distance of the directional sound wave SW2 or a non-overlapping area between the first sound wave SW1 and the directional sound wave SW2 can form (or implement) an inaudible area that does not enable the user to listen to sound.

[0559] Figure 36 is another cross-sectional view taken along Figure 31 line III-III' illustrated in FIG. 3, Figure 37 is a plan view of a second vibration structure of the second vibration structure illustrated in Figure 31 and Figure 36 is a plan view of a second vibration structure of the second vibration structure illustrated in Figure 38 is a cross-sectional view of a vibration generation portion illustrated in Figure 36 and Figure 37 . Figures 36-38 Embodiments implemented by modifying the second vibration structure in the vibration device described above with reference to Figures 1-4 will be described below. In the following description, the same reference numerals denote the same elements among elements other than the first vibration structure and elements related thereto, and repetitive description thereof can be omitted or will be briefly given below.

[0560] Referring to Figures 36-38 , in the vibration device according to another embodiment of the disclosure, the second vibration structure 430 can be implemented to output a directional sound wave (or second sound wave) having an orientation in a specific direction. For example, the second vibration structure 430 can be implemented to output the directional sound wave toward a central portion of the vibration device without being parallel to a front surface of the vibration device.

[0561] The second vibration structure 430 according to the embodiment of the disclosure can include the first base member 111, the second base member 112, and a pair of vibration generation portions 433.

[0562] The first base member 111 and the second base member 112 can be disposed to overlap each other. Each of the first base member 111 and the second base member 112 can be identical to the first base member 111 and the second base member 112 described above with reference to Figure 3 and Figure 4The first base member 111 or the second base member 112 of the first vibration structure 110 described above is the same, and thus repetitive description thereof can be omitted or will be briefly given below.

[0563] Each of the pair of vibration generation parts 433 can be disposed or inserted between the first base member 111 and the second base member 112. Each of the pair of vibration generation parts 433 can include an inclined surface inclined in a certain direction. Each of the pair of vibration generation parts 433 can generate a directional sound wave in a certain direction through the inclined surface. For example, a sound wave generated based on vibration (or displacement or driving) of each of the pair of vibration generation parts 433 can have an orientation in which the sound wave travels in a forward direction of a central portion of the vibration device.

[0564] Each of the pair of vibration generation parts 433 can overlap or stack with the vibration generation parts disposed at two peripheral portions of the plurality of vibration generation parts 113 disposed in the first vibration structure 110. According to an embodiment of the disclosure, a first vibration generation part of the pair of vibration generation parts 433 can be disposed at a first area A1 between a first side (or one end) EP1 of the second vibration structure 430 and the center line CL with respect to the first direction X. For example, the first vibration generation part of the pair of vibration generation parts 433 can be disposed at a right peripheral portion (or a second peripheral portion) of the second vibration structure 430 with respect to the first direction X. For example, the first vibration generation part of the pair of vibration generation parts 433 can overlap or stack with the vibration generation parts 113 disposed at the right peripheral portion of the first vibration structure 110 without interleaving.

[0565] According to an embodiment of the disclosure, a second vibration generation part of the pair of vibration generation parts 433 can be disposed at a second area A2 between a second side (or the other end) EP2 of the second vibration structure 430 and the center line CL with respect to the first direction X. For example, the second vibration generation part of the pair of vibration generation parts 433 can be disposed at a left peripheral portion (or a third peripheral portion) of the second vibration structure 430 with respect to the first direction X. For example, the second vibration generation part of the pair of vibration generation parts 433 can overlap or stack with the vibration generation parts 113 disposed at the left peripheral portion of the first vibration structure 110 without interleaving.

[0566] Each of the pair of vibration generation parts 433 according to an embodiment of the disclosure can include a vibration part 433a including a piezoelectric material, a first electrode layer 433b disposed at a first surface of the vibration part 433a, and a second electrode layer 433c disposed at a second surface of the vibration part 433a.

[0567] The vibration part 433a can include a piezoelectric material as described above with reference to the vibration part 113 of the first vibration structure 110. Figure 3The piezoelectric material of the described vibration portion 113a is the same, and thus repeated description thereof can be omitted.

[0568] The vibration portion 433a according to the embodiment of the disclosure can include a first surface 433s1 having a tilted surface structure and a second surface 433s2 having a planar structure.

[0569] The second surface 433s2 of the vibration portion 433a can include a flat surface or a flat surface. For example, the second surface 433s2 of the vibration portion 433a can be parallel to the first surface (or the upper surface) of the second base member 112.

[0570] The first surface 433s1 of the vibration portion 433a can have a tilted surface structure that is tilted with respect to the first direction X from the ends EP1 and EP2 (or one side) of the second vibration structure 430 to the center line CL. The distance (or thickness) between the first surface 433s1 and the second surface 433s2 of the vibration portion 433a can gradually decrease in a direction from the ends EP1 and EP2 (or one side) of the second vibration structure 430 to the center line CL.

[0571] The first surface 433s1 of the vibration portion 433a according to the embodiment of the disclosure can include a tilted surface IS that is tilted to have a predetermined slope. For example, the first surface 433s1 of the vibration portion 433a can include a tilted surface IS that is formed by using a molding process of a piezoelectric material.

[0572] According to the embodiment of the disclosure, in the vibration portion 433a, an included angle θ between the tilted surface IS of the first surface 433s1 and the second surface 433s2 can be an acute angle. For example, the included angle θ between the tilted surface IS of the first surface 433s1 and the second surface 433s2 can be set to a range of 10 degrees to 75 degrees, but the embodiment of the disclosure is not limited thereto. For example, the included angle θ can be adjusted based on a focal distance of beamforming of a directional acoustic wave and / or a directional angle of an acoustic wave having directivity.

[0573] According to the embodiment of the disclosure, the height of the tilted surface IS of the first surface 433s1 can gradually decrease with respect to the first direction X in a direction from the ends EP1 and EP2 (or one side) of the second vibration structure 430 to the center line CL. For example, the tilted surface IS of the first surface 433s1 can be tilted with respect to the second surface 433s2, and thus the distance or thickness between the tilted surface IS of the first surface 433s1 and the second surface 433s2 with respect to the thickness direction Z of the vibration device can gradually decrease in a direction from the ends EP1 and EP2 (or one side) of the second vibration structure 430 to the center line CL.

[0574] According to embodiments of the present disclosure, in the first vibration generating portion of the pair of vibration generating portions 433, the height of the inclined surface IS of the first surface 433s1 can gradually decrease in a direction from the first side (end portion) EP1 of the second vibration structure 430 to the center line CL. In the second vibration generating portion of the pair of vibration generating portions 433, the height of the inclined surface IS of the first surface 433s1 can gradually decrease in a direction from the second side (end portion) EP2 of the second vibration structure 430 to the center line CL. Accordingly, the pair of vibration generating portions 433 can have a structure symmetrical with respect to the center line CL in the first direction X.

[0575] The first electrode layer 433b can be disposed at the first surface 433s1 of the vibration portion 433a. The first electrode layer 433b can directly contact the first surface 433s1 of the vibration portion 433a, and thus, the first electrode layer 433b can include an inclined surface inclined the same as the first surface 433s1 of the vibration portion 433a. Except that the first electrode layer 433b includes the inclined surface, the first electrode layer 433b can be substantially the same as the first electrode layer 113b described above with reference to FIG. 1, and thus, repetitive description thereof can be omitted. Figure 3

[0576] The second electrode layer 433c can be disposed at the second surface 433s2 of the vibration portion 433a. The second electrode layer 433c can directly contact the second surface 433s2 of the vibration portion 433a, and thus, the second electrode layer 433c can have the same planar structure as the second surface 433s2 of the vibration portion 433a. The second electrode layer 433c can be substantially the same as the second electrode layer 113c described above with reference to FIG. 1, and thus, repetitive description thereof can be omitted. Figure 3

[0577] The vibration portion 433a of each of the pair of vibration generating portions 433 can vibrate based on the second vibration driving signal supplied to the first electrode layer 433b and the second electrode layer 433c to generate a directional sound wave propagating toward the center line CL of the vibration device. For example, the directional sound wave can be output in a direction parallel to the inclined surface of the vibration portion 433a, and thus, the directional sound wave can have a directivity concentrated on a frontward region away from the center line CL of the vibration device.

[0578] The second vibration structure 430 according to the embodiments of the present disclosure can further include an adhesive layer 114 disposed between the first base member 111 and the second base member 112 to surround side surfaces (or side walls) of the pair of vibration generating portions 433.

[0579] ​​The adhesive layer 114 can relatively bind the first base member 111 to the second base member 112, and the pair of vibration generation parts 433 is located between the first base member 111 and the second base member 112. The adhesive layer 114 can be disposed in regions other than the pair of vibration generation parts 433 in the region between the first base member 111 and the second base member 112. The adhesive layer 114 can be substantially the same as the adhesive layer 114 described above with reference to Figure 3 and Figure 4 Therefore, the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0580] The second vibration structure 130 according to the embodiment of the disclosure can further include a pair of first power supply electrodes 115 and a pair of second power supply electrodes 116.

[0581] Each of the pair of first power supply electrodes 115 can be disposed between the pair of vibration generation parts 433 and the first base member 111, and can be electrically connected to the first electrode layer 433b of each of the pair of vibration generation parts 433. In addition to each of the pair of first power supply electrodes 115 being disposed at the second surface of the first base member 111 to overlap each of the pair of vibration generation parts 433 and to be electrically connected to the first electrode layer 433b of each of the pair of vibration generation parts 433, each of the pair of first power supply electrodes 115 can be substantially the same as each of the plurality of first power supply electrodes 115 described above with reference to Figure 3 and Figure 4 Therefore, the same reference numerals denote the same elements, and repetitive description thereof can be omitted.

[0582] According to an embodiment of the disclosure, each of the pair of first power supply electrodes 115 can be electrically connected to the first electrode layer 433b of each of the pair of vibration generation parts 433 through an anisotropic conductive film. According to another embodiment of the disclosure, each of the pair of first power supply electrodes 115 can be electrically connected to the first electrode layer 433b of each of the pair of vibration generation parts 433 through a conductive material (or particles) included in the adhesive layer 114 or the first adhesive layer 114a, instead of the anisotropic conductive film.

[0583] Each of the pair of second power supply electrodes 116 can be disposed between the pair of vibration generation parts 433 and the second base member 112, and can be electrically connected to the second electrode layer 433c of each of the pair of vibration generation parts 433. In addition to each of the pair of second power supply electrodes 116 being disposed at the first surface of the second base member 112 to overlap with each of the pair of vibration generation parts 433 and be electrically connected to the second electrode layer 433c of each of the pair of vibration generation parts 433, each of the pair of second power supply electrodes 116 can be substantially the same as each of the plurality of second power supply electrodes 116 described above with reference to Figure 3 and Figure 4 Therefore, the same reference numerals denote the same elements, and repetitive descriptions thereof can be omitted.

[0584] According to an embodiment of the disclosure, each of the pair of second power supply electrodes 116 can be electrically connected to the second electrode layer 433c of each of the pair of vibration generation parts 433 through an anisotropic conductive film. According to another embodiment of the disclosure, each of the pair of second power supply electrodes 116 can be electrically connected to the second electrode layer 433c of each of the pair of vibration generation parts 433 through a conductive material (or particles) included in the adhesive layer 114 or the second adhesive layer 114b, instead of the anisotropic conductive film.

[0585] The second vibration structure 430 according to an embodiment of the disclosure can include a pair of first power supply lines 117, a pair of second power supply lines 118, and a pad portion 119.

[0586] Each of the pair of first power supply lines 117 can be electrically connected to each of the pair of first power supply electrodes 115. Each of the pair of first power supply lines 117 can be directly formed at the second surface (or rear surface) of the first base member 111 together with each of the pair of first power supply electrodes 115.

[0587] Each of the pair of second power supply lines 118 can be electrically connected to each of the pair of second power supply electrodes 116. Each of the pair of second power supply lines 118 can be directly formed at the first surface (or front surface) of the second base member 112 together with each of the pair of second power supply electrodes 116.

[0588] The pad portion 119 can be disposed at the first outer circumferential portion of the second surface outer circumferential portion of the first base member 111 and the first outer circumferential portion of the first surface outer circumferential portion of the second base member 112.

[0589] According to embodiments of the present disclosure, the pad portion 119 may include a pair of first pads 119a electrically connected to each of a pair of first power lines 117 and a pair of second pads 119b electrically connected to each of a pair of second power lines 118.

[0590] Each of the pair of first pads 119a and the pair of second pads 119b can be exposed to the outside through pad holes formed at any one or more of the first base member 111 and the second base member 112.

[0591] The second vibration structure 430 according to an embodiment of this disclosure may further include a flexible cable FC connected to the pad portion 119. The flexible cable FC may be electrically connected to the pad portion 119. Therefore, the flexible cable FC may transmit a second vibration drive signal provided from the vibration drive circuit to the corresponding pad portion 119. In addition to the flexible cable FC including multiple first signal transmission lines STL1 electrically connected to each of a pair of first pads 119a and multiple second signal transmission lines STL2 electrically connected to each of a pair of second pads 119b, the flexible cable FC may be connected to the aforementioned... Figure 3 and Figure 4 The flexible cable FC described is essentially the same; therefore, the same reference numerals denote the same elements, and their repeated descriptions can be omitted.

[0592] As described above, in another embodiment of the vibration device according to this disclosure, such as Figure 39 As shown, the second vibration structure 430 and the first vibration structure 110 can overlap or stack, and the vibration device can output sound with directionality or directional angle based on the first sound wave SW1 generated from the first vibration structure 110 and the directional sound wave (or second sound wave) SW2 generated from the second vibration structure 430. Therefore, in a vibration device according to another embodiment of the present disclosure, based on the beat frequency phenomenon between the first sound wave SW1 and the directional sound wave SW2, the overlapping area between the first sound wave SW1 and the directional sound wave SW2 can form (or realize) an audible area where the user can hear the sound, and the area outside the focal length of the directional sound wave SW2 or the non-overlapping area between the first sound wave SW1 and the directional sound wave SW2 can form (or realize) an inaudible area where the user cannot hear the sound.

[0593] Figure 40 It shows according to Figure 31 The second vibration structure of another embodiment of this disclosure is shown, and it is illustrated by modifying the reference above. Figures 36-39 The implementation is achieved by the first power supply electrode in the described second vibration structure. Therefore, in the following description, repeated descriptions of components other than the first power supply electrode and related components may be omitted, or repeated descriptions will be briefly given below.

[0594] Referring to Figure 36 and Figure 40 , the second vibration structure 430 according to another embodiment of the disclosure can include a plurality of first power supply electrodes 115.

[0595] Each of the plurality of first power supply electrodes 115 can be disposed between each of the pair of vibration generation parts 433 and the first base member 111, and can be spaced apart from each other by having a predetermined interval in the second direction Y.

[0596] Each of the plurality of first power supply electrodes 115 according to the embodiment of the disclosure can have an island shape in which the plurality of first power supply electrodes 115 are disposed at the pair of vibration generation parts 433 that overlap each of the pair of second power supply electrodes 116. For example, each of the plurality of first power supply electrodes 115 can have a rectangular shape in which the plurality of first power supply electrodes 115 intersect the pair of second power supply electrodes 116 in the first direction X, but embodiments of the disclosure are not limited thereto. For example, the plurality of first power supply electrodes 115 can be separated from each other in the second direction Y.

[0597] Each of the plurality of first power supply electrodes 115 can be partially connected to the first electrode layer 433b of each of the pair of vibration generation parts 433.

[0598] Each of the plurality of first power supply electrodes 115 can be electrically connected to the pad part 119 through a corresponding first power supply line 117 of the plurality of first power supply lines 117. The pad part 119 can include a plurality of first pads 119a electrically connected to the plurality of first power supply lines 117, respectively.

[0599] Each of the pair of vibration generation parts 433 can include a plurality of vibration generation regions among a plurality of crossing parts (or crossing regions) formed between the plurality of first power supply electrodes 115 and the pair of second power supply electrodes 116. Each of the pair of vibration generation parts 433 can generate an acoustic wave based on repeated contraction and expansion of the vibration part 433a corresponding to each of the plurality of vibration generation regions. For example, each of the plurality of vibration generation regions can individually vibrate based on a second vibration driving signal selectively provided through a corresponding first power supply electrode 115 of the plurality of first power supply electrodes 115 to generate an acoustic wave.

[0600] As described above, the second vibration structure 430 according to the embodiment of the disclosure can generate the same or different acoustic waves based on individual vibrations of the vibration generation regions of the pair of vibration generation parts 433 overlapping each of the plurality of first power supply electrodes 115.

[0601] Figure 41 According to Figure 31A second vibration structure of another embodiment of the disclosure is illustrated, and illustrates an embodiment implemented by modifying the first vibration structure described above with reference to Figures 36-39 An embodiment implemented by modifying the vibration generating portion in the second vibration structure described above is described. Therefore, in the following description, a repeated description of elements other than the vibration generating portion and elements related thereto can be omitted or will be briefly given below.

[0602] Referring to Figure 36 and Figure 41 , the second vibration structure 430 according to another embodiment of the disclosure can include a pair of vibration generating portions 433 having a non-linear shape.

[0603] The pair of vibration generating portions 433 can be disposed at a peripheral portion of the second vibration structure 430 to overlap with a peripheral portion of the first vibration structure 410. For example, each of the pair of vibration generating portions 433 can be formed to have a planar structure having an L shape, and can be disposed at the peripheral portion of the second vibration structure 430.

[0604] According to an embodiment of the disclosure, a first vibration generating portion of the pair of vibration generating portions 433 can be formed to have a planar shape having a “┛” shape, and can be disposed at a first peripheral portion and a second peripheral portion of the second vibration structure 430. A second vibration generating portion of the pair of vibration generating portions 433 can be formed to have a planar shape having a “┏” shape, and can be disposed at a third peripheral portion and a fourth peripheral portion of the second vibration structure 430.

[0605] As Figure 38 illustrated, each of the pair of vibration generating portions 433 can include a vibration portion 433a including a piezoelectric material, a first electrode layer 433b disposed at a first surface of the vibration portion 433a, and a second electrode layer 433c disposed at a second surface of the vibration portion 433a. The vibration portion 433a of the pair of vibration generating portions 433 can include a first surface 433s1 having an inclined surface structure and a second surface 433s2 having a planar structure. Except that each of the pair of vibration generating portions 433 has a planar structure having an L shape, each of the pair of vibration generating portions 433 can be the same as each of the pair of vibration generating portions 433 described above with reference to Figures 36-39 Therefore, the same reference numerals denote the same elements, and a repeated description thereof can be omitted.

[0606] Each of the pair of vibration generating portions 433 can generate a directional sound wave propagating in a specific direction based on the inclined surface of the vibration portion 433a. For example, a sound wave generated based on vibration (or displacement) of each of the pair of vibration generating portions 433 can have directivity in which the sound wave travels in a forward direction of a central portion of the vibration device.

[0607] The second vibration structure 430 according to another embodiment of the disclosure can further include a pair of first power supply electrodes 115 and a pair of second power supply electrodes 116.

[0608] Each of the pair of first power supply electrodes 115 can be disposed between the first base member 111 and a corresponding vibration generation part of the pair of vibration generation parts 433, and can be electrically connected to a first electrode layer of the corresponding vibration generation part of the pair of vibration generation parts 433. Except that each of the pair of first power supply electrodes 115 has a planar structure having an "L" shape, each of the pair of first power supply electrodes 115 can be the same as each of the pair of first power supply electrodes 115 described above with reference to FIGS. 3A and 3B, and thus the same reference numerals will be used to refer to the same elements, and repetitive description thereof can be omitted. Figure 36 and Figure 37 The same reference numerals will be used to refer to the same elements, and repetitive description thereof can be omitted.

[0609] Each of the pair of second power supply electrodes 116 can be disposed between the second base member 112 and a corresponding vibration generation part of the pair of vibration generation parts 433, and can be electrically connected to a second electrode layer of the corresponding vibration generation part of the pair of vibration generation parts 433. Except that each of the pair of first power supply electrodes 115 has a planar structure having an "L" shape, each of the pair of first power supply electrodes 115 can be the same as each of the pair of first power supply electrodes 115 described above with reference to FIGS. 3A and 3B, and thus the same reference numerals will be used to refer to the same elements, and repetitive description thereof can be omitted. Figure 36 and Figure 37 The same reference numerals will be used to refer to the same elements, and repetitive description thereof can be omitted.

[0610] The second vibration structure 430 according to an embodiment of the disclosure can further include a pair of first power supply lines 117, a pair of second power supply lines 118, a pad portion 119, and a flexible cable FC. Each of the pair of first power supply lines 117, the pair of second power supply lines 118, the pad portion 119, and the flexible cable FC of the second vibration structure 430 according to an embodiment of the disclosure can be the same as described above with reference to FIGS. 3A and 3B, and thus the same reference numerals will be used to refer to the same elements, and repetitive description thereof can be omitted. Figure 36 and Figure 37 The same reference numerals will be used to refer to the same elements, and repetitive description thereof can be omitted.

[0611] As described above, the second vibration structure 430 according to another embodiment of the disclosure can generate a sound wave having a directivity traveling in a specific direction based on the vibration part 433a including the inclined surface disposed in each of the pair of vibration generation parts 433.

[0612] Figure 42 A second vibration structure according to another embodiment of the disclosure is illustrated, and an embodiment implemented by modifying the first power supply electrode in the second vibration structure described above with reference to FIG. 4A is illustrated. Figure 31 Figure 41 The second vibration structure according to another embodiment of the disclosure is illustrated, and an embodiment implemented by modifying the first power supply electrode in the second vibration structure described above with reference to FIG. 4A is illustrated.

[0613] Referring to Figure 36 and Figure 42 , the second vibration structure 430 according to another embodiment of the disclosure can include a plurality of first power supply electrodes 115.

[0614] The plurality of first power supply electrodes 115 can each be disposed between each of the pair of vibration generation parts 433 and the first base member 111, and can be spaced apart from each other by having a predetermined interval in the first direction X and the second direction Y.

[0615] Each of the plurality of first power supply electrodes 115 according to an embodiment of the disclosure can have an island shape in which the plurality of first power supply electrodes 115 are disposed at the pair of vibration generation parts 433 that overlap each of the pair of second power supply electrodes 116. For example, each of the plurality of first power supply electrodes 115 can have a rectangular shape in which the plurality of first power supply electrodes 115 intersect the pair of second power supply electrodes 116 in the first direction X, but embodiments of the disclosure are not limited thereto. For example, the plurality of first power supply electrodes 115 can be separated from each other in the first direction X and the second direction Y.

[0616] Each of the plurality of first power supply electrodes 115 can be partially connected to the first electrode layer 433b of each of the pair of vibration generation parts 433.

[0617] Each of the plurality of first power supply electrodes 115 can be electrically connected to the pad part 119 through a corresponding first power supply line 117 of the plurality of first power supply lines 117. The pad part 119 can include a plurality of first pads 119a electrically connected to the plurality of first power supply lines 117, respectively.

[0618] ​Each of the pair of vibration generation parts 433 can include a plurality of vibration generation regions formed in a plurality of crossing parts (or crossing regions) between the plurality of first power electrodes 115 and the pair of second power electrodes 116. Each of the pair of vibration generation parts 433 can generate an acoustic wave based on repeated contraction and expansion of the vibration part 433a corresponding to each of the plurality of vibration generation regions. For example, each of the plurality of vibration generation regions can individually vibrate based on the second vibration driving signal selectively provided through the corresponding first power electrode 115 of the plurality of first power electrodes 115 to generate an acoustic wave.

[0619] As described above, the second vibration structure 430 according to the embodiment of the disclosure can generate the same or different acoustic waves based on individual vibrations of the vibration generation regions of the pair of vibration generation parts 433 respectively overlapping the plurality of first power electrodes 115.

[0620] Figure 43 A device according to an embodiment of the disclosure is illustrated, and Figure 44 is a cross-sectional view taken along Figure 43 line IV-IV' shown in FIG. 1B.

[0621] Referring to Figure 43 and Figure 44 , a device (or a display device) according to an embodiment of the disclosure can include a display panel (a vibration object or a vibration member) 1100 for displaying an image, and a vibration generation device 1200 for vibrating the display panel 1100 at a rear surface (or a back surface) of the display panel 100.

[0622] The display panel 1100 can display an electronic image or a digital image. For example, the display panel 1100 can output light to display an image. The display panel 1100 can be a curved display panel, or can be any type of display panel such as a liquid crystal display panel, an organic light emitting display panel, a quantum dot light emitting display panel, a micro light emitting diode display panel, and an electrophoretic display panel, etc. The display panel 1100 can be a flexible display panel. For example, the display panel 1100 can be a flexible light emitting display panel, a flexible electrophoretic display panel, a flexible electro wetting display panel, a flexible micro light emitting diode display panel, or a flexible quantum dot light emitting display panel, but embodiments of the disclosure are not limited thereto.

[0623] The display panel 1100 according to an embodiment of the disclosure can include a display area AA (or an active display area) for displaying an image according to driving of a plurality of pixels. In addition, the display panel 1100 can further include a non-display area IA surrounding the display area AA, but embodiments of the disclosure are not limited thereto.

[0624] The display panel 1100 according to an embodiment of the disclosure can include a pixel array portion disposed at a display area AA of a substrate. The pixel array portion can include a plurality of pixels that display an image based on a signal provided through a signal line. The signal line can include a gate line, a data line, and a pixel driving power line, etc., but embodiments of the disclosure are not limited thereto.

[0625] Each of the plurality of pixels can include a pixel circuit layer including a driving thin film transistor (TFT) disposed at a pixel region constituted by a plurality of gate lines and / or a plurality of data lines, a first electrode (or a pixel electrode) electrically connected to the driving TFT, a light emitting device formed at an anode electrode, and a second electrode (or a common electrode) electrically connected to the light emitting device.

[0626] The light emitting device according to an embodiment of the disclosure can include an organic light emitting device layer formed at the first electrode. The organic light emitting device layer can be implemented to emit light having the same color (e.g., white light) for each pixel, or can be implemented to emit light having different colors (e.g., red light, green light, or blue light) for each pixel.

[0627] The light emitting device according to another embodiment of the disclosure can include a micro light emitting diode device electrically connected with each of the first electrode and the second electrode. The micro light emitting diode device can be a light emitting diode implemented in an integrated circuit (IC) or a chip type. The micro light emitting diode device can include a first terminal electrically connected to the first electrode and a second terminal electrically connected to the second electrode.

[0628] The display panel 1100 according to another embodiment of the disclosure can include a first substrate, a second substrate, and a liquid crystal layer. The first substrate can be an upper substrate or a thin film transistor (TFT) array substrate. For example, the first substrate can include a pixel array including a plurality of pixels disposed in a plurality of pixel regions defined by intersections of a plurality of gate lines and / or a plurality of data lines, respectively. Each of the plurality of pixels can include a TFT connected with the gate line and / or the data line, a pixel electrode connected with the TFT, and a common electrode disposed adjacent to the pixel electrode and provided with a common voltage. For example, the second substrate can include a pixel defining pattern including an opening region overlapping the pixel region formed in the first substrate, and a color filter layer formed at the opening region. The liquid crystal layer can be disposed between the first substrate and the second substrate. The liquid crystal layer can include a liquid crystal containing liquid crystal molecules, wherein an alignment direction of the liquid crystal molecules is changed based on an electric field generated by the common voltage and a data voltage applied to the pixel electrode of each pixel.

[0629] The vibration generation device 1200 can vibrate the display panel 1100 at a rear surface of the display panel 1100, thereby providing a user with sound and / or haptic feedback based on the vibration of the display panel 1100. The vibration generation device 1200 can be implemented at the rear surface of the display panel 1100 to directly vibrate the display panel 1100.

[0630] As an embodiment of the disclosure, the vibration generation device 1200 can vibrate according to a vibration driving signal synchronized with an image displayed by the display panel 1100 to vibrate the display panel 1100. As another embodiment of the disclosure, the vibration generation device 1200 can vibrate according to a haptic feedback signal (or tactile feedback signal) synchronized with a user touch applied to a touch panel (or touch sensor layer) disposed at or embedded into the display panel 1100, and can vibrate the display panel 1100. Accordingly, the display panel 1100 can vibrate based on the vibration of the vibration generation device 1200 to provide a user (or viewer) with at least one or more of sound and haptic feedback.

[0631] The vibration generation device 1200 according to an embodiment of the disclosure can be implemented to have a size corresponding to the display area AA of the display panel 1100. The size of the vibration generation device 1200 can be 0.9 to 1.1 times the size of the display area AA, but embodiments of the disclosure are not limited thereto. For example, the size of the vibration generation device 1200 can be the same as or smaller than the size of the display area AA. For example, the size of the vibration generation device 1200 can be the same as or approximately the same as the display area AA of the display panel 1100, and thus, the vibration generation device 1200 can cover most of the area of the display panel 1100, and the vibration generated by the vibration generation device 1200 can vibrate the entire portion of the display panel 1100, and thus, the localization of sound can be high, and the satisfaction of a user can be improved. In addition, the contact area (or panel coverage) between the display panel 1100 and the vibration generation device 1200 can be increased, and thus, the vibration area of the display panel 1100 can be increased, thereby improving the sound of a low-pitched sound band generated based on the vibration of the display panel 1100. In addition, the vibration generation device 1200 applied to a large-sized display device can vibrate the entire display panel 1100 having a large size (or a large area), and thus, the localization of sound based on the vibration of the display panel 1100 can be further enhanced, thereby achieving improved sound effects.

[0632] The vibration generation device 1200 according to an embodiment of the disclosure can include one or more of the vibration devices described above with reference to Figures 1-42 A repeated description thereof can be omitted.

[0633] The device according to an embodiment of the disclosure can further include a connection member 1150 disposed between the display panel 1100 and the vibration generating device 1200.

[0634] The connection member 1150 can be disposed between the display panel 1100 and the vibration generating device 1200, and thus can connect or couple the vibration generating device 1200 to the rear surface of the display panel 1100. For example, the vibration generating device 200 can be directly connected or coupled to the rear surface of the display panel 1100 through the connection member 1150, and thus the vibration generating device 200 can be supported by or disposed at the rear surface of the display panel 1100.

[0635] The connection member 1150 according to an embodiment of the disclosure can be configured as a material including an adhesive layer having good adhesion or attachment force with respect to each of the display panel 1100 and the rear surface of the vibration generating device 200. For example, the connection member 1150 can include a foam pad, a double-sided tape, or an adhesive, but embodiments of the disclosure are not limited thereto. For example, the adhesive layer of the connection member 1150 can include an epoxy resin, an acrylic resin, a silicone resin, or a polyurethane, but embodiments of the disclosure are not limited thereto. For example, the adhesive layer of the connection member 1150 can be different from the adhesive layer of the adhesive member 120. For example, the adhesive layer of the connection member 1150 can include an acrylic material that is relatively better in adhesion and hardness between acrylic and polyurethane. Thus, vibrations of the vibration generating device 1200 can be well transmitted to the display panel 1100.

[0636] The connection member 1150 according to another embodiment of the disclosure can further include a hollow portion between the display panel 1100 and the vibration generating device 1200. The hollow portion of the connection member 1150 can provide an air gap between the display panel 1100 and the vibration generating device 1200. Due to the air gap, sound waves (or acoustic pressure) based on vibrations of the vibration generating device 1200 can not be dispersed by the connection member 1150 and can be concentrated on the display panel 1100. Thus, loss of vibrations caused by the connection member 1150 can be minimized, thereby increasing an acoustic pressure characteristic of sound generated based on vibrations of the display panel 1100.

[0637] The device according to an embodiment of the disclosure can further include a support member 1300 disposed at the rear surface of the display panel 1100.

[0638] The support member 1300 can cover a rear surface of the display panel 1100. For example, the support member 1300 can cover the entire rear surface of the display panel 1100 with a gap space GS therebetween. For example, the support member 1300 can include at least one or more of a glass material, a metal material, and a plastic material. For example, the support member 1300 can be referred to as a rear surface structure, a setting structure, a cover bottom, or a back cover, but embodiments of the present disclosure are not limited thereto.

[0639] The support member 1300 according to an embodiment of the present disclosure can include a first support member 1310 and a second support member 1330.

[0640] The first support member 1310 can cover a rear surface of the display panel 1100. For example, the first support member 1310 can be a member that covers the entire rear surface of the display panel 1100. For example, the first support member 1310 can include at least one or more of a glass material, a metal material, and a plastic material. For example, the first support member 1310 can be an inner plate, but embodiments of the present disclosure are not limited thereto.

[0641] The first support member 1310 can be spaced apart from a rear surface of the display panel 1100 or the vibration generation device 1200 with a gap space GS therebetween. For example, the gap space GS can be referred to as an air gap, a vibration space, a sound resonance box, or the like, but embodiments of the present disclosure are not limited thereto.

[0642] The second support member 1330 can be disposed at a rear surface of the first support member 1310. The second support member 1330 can be a plate-shaped member that covers the entire rear surface of the first support member 1310. For example, the second support member 1330 can include at least one or more of a glass material, a metal material, and a plastic material. For example, the second support member 1330 can be an outer plate, a rear plate, a back plate, a back cover, or a rear cover, but embodiments of the present disclosure are not limited thereto.

[0643] The support member 1300 according to an embodiment of the disclosure can further include a coupling member (or a connecting member) 1350. The coupling member 1350 can be disposed between the first support member 1310 and the second support member 1330. For example, the first support member 1310 and the second support member 1330 can be coupled or connected to each other through the coupling member 1350. For example, the coupling member 1350 can be an adhesive resin, a double-sided tape, or a double-sided adhesive foam pad, but embodiments of the disclosure are not limited thereto. For example, the coupling member 1350 can have elasticity to absorb an impact, but embodiments of the disclosure are not limited thereto. As an embodiment of the disclosure, the coupling member 1350 can be disposed at the entire area between the first support member 1310 and the second support member 1330. As another embodiment of the disclosure, the coupling member 1350 can be disposed in a mesh structure (or a mesh shape) including air gaps between the first support member 1310 and the second support member 1330.

[0644] The device according to an embodiment of the disclosure can further include an intermediate frame 1400.

[0645] The intermediate frame 1400 can be disposed between the rear peripheral portion of the display panel 1100 and the front peripheral portion of the support member 1300. The intermediate frame 1400 can support at least one or more of the rear peripheral portion of the display panel 1100 and the front peripheral portion of the support member 1300, respectively, and can surround one or more of the side surfaces of each of the display panel 1100 and the support member 1300, respectively. The intermediate frame 1400 can provide a gap space GS between the display panel 1100 and the support member 1300.

[0646] According to an embodiment of the disclosure, the intermediate frame 1400 can be coupled or connected to the rear peripheral portion of the display panel 1100 through a first connecting member 1401. The intermediate frame 1400 can be coupled or connected to the rear peripheral portion of the support member 1300 through a second connecting member 1403.

[0647] The device according to an embodiment of the disclosure can include a panel connecting member or an adhesive member instead of the intermediate frame 1400. The panel connecting member can be disposed between the rear peripheral portion of the display panel 1100 and the front peripheral portion of the support member 1300, and can provide a gap space GS between the display panel 1100 and the support member 1300. The panel connecting member can be disposed between the rear peripheral portion of the display panel 1100 and the front peripheral portion of the support member 1300 to adhere the display panel 1100 and the support member 1300.

[0648] As described above, the device (or display device) according to the embodiment of the disclosure can output a sound generated by the display panel 1100 based on the vibration of the vibration generation device 1200 disposed at the rear surface of the display panel 1100 to a front region of the front of the display panel 1100 or the device (or display device), can concentrate or focus the sound generated based on the vibration of the vibration generation device 1200 in a specific direction, and thus, a user privacy protection function allowing a user not to listen to the sound in a peripheral region (or inaudible region) other than a region (or audible region) in a specific direction can be implemented.

[0649] In Figure 43 and Figure 44 , it has been described that the vibration generation device 1200 vibrates the display panel 1100 to generate or output a sound, but the embodiment of the disclosure is not limited thereto. For example, the vibration generation device 1200 can vibrate other vibration objects (or vibration members) other than the display panel 1100 described above as a vibration object to generate or output a sound.

[0650] Figure 45 is another cross-sectional view taken along the line IV-IV' shown in Figure 43 Figure 45 Embodiments implemented by modifying the vibration generation device shown in Figure 44 will be described below. Thus, in the following description, a repeated description of elements other than the vibration generation device and elements related thereto can be omitted or will be briefly given.

[0651] Referring to Figure 43 and Figure 45 , in the device according to another embodiment of the disclosure, the display panel 1100 (or vibration object or vibration member) can include a first rear region RA1 and a second rear region RA2. For example, the first rear region RA1 can be a right rear region, and the second rear region RA2 can be a left rear region. The first rear region RA1 and the second rear region RA2 can be left and right symmetrical with respect to a center line CL of the display panel 1100 in the first direction X, but the embodiment of the disclosure is not limited thereto. For example, each of the first rear region RA1 and the second rear region RA2 can overlap the display region AA of the display panel 1100.

[0652] The vibration generation device 1200 according to another embodiment of the disclosure can include a first vibration generation apparatus 1200-1 and a second vibration generation apparatus 1200-2.

[0653] ​The first vibration generation device 1200-1 can be disposed at the first rear area RA1 of the display panel 1100. The size of the first vibration generation device 1200-1 can have the same size as the first rear area RA1 of the display panel 1100 or can have a size smaller than the first rear area RA1 of the display panel 1100, based on the characteristics of the first sound or the sound characteristics required by the device. For example, the first vibration generation device 1200-1 can be disposed close to the center or the periphery within the first rear area RA1 of the display panel 1100 with respect to the first direction X.

[0654] According to an embodiment of the disclosure, the first vibration generation device 1200-1 can vibrate the first rear area RA1 of the display panel 1100, and thus, can generate the first sound in at least one of the first vibration sound, the first directional vibration sound, and the first haptic feedback. For example, the first vibration generation device 1200-1 can directly vibrate the first rear area RA1 of the display panel 1100, and thus, can generate the first sound in the first rear area RA1 of the display panel 1100. For example, the first sound can be a right sound.

[0655] The second vibration generation device 1200-2 can be disposed at the second rear area RA2 of the display panel 1100. The size of the second vibration generation device 1200-2 can have the same size as the second rear area RA2 of the display panel 1100 or can have a size smaller than the second rear area RA2 of the display panel 1100, based on the characteristics of the second sound or the sound characteristics required by the device. For example, the second vibration generation device 1200-2 can be disposed close to the center or the periphery within the second rear area RA2 of the display panel 1100 with respect to the first direction X.

[0656] According to an embodiment of the disclosure, the second vibration generation device 1200-2 can vibrate the second rear area RA2 of the display panel 1100, and thus, can generate the second sound in at least one of the second vibration sound, the second directional vibration sound, and the second haptic feedback. For example, the second vibration generation device 1200-2 can directly vibrate the second rear area RA2 of the display panel 1100, and thus, can generate the second sound in the second rear area RA2 of the display panel 1100. For example, the second sound can be a left sound.

[0657] The first vibration generation device 200-1 and the second vibration generation device 200-2 can have the same size as each other or different sizes, based on the sound characteristics of the left sound and the right sound and / or the sound characteristics of the device. Also, the first vibration generation device 200-1 and the second vibration generation device 200-2 can be disposed in a left-right symmetrical structure or a left-right asymmetrical structure with respect to the center line CL of the display panel 1100.

[0658] Each of the first vibration generation device 200-1 and the second vibration generation device 200-2 can include one or more of the vibration devices described above with reference to Figures 1-42 A detailed description thereof can be omitted.

[0659] Each of the first vibration generation device 200-1 and the second vibration generation device 200-2 can be disposed at the rear surface of the display panel 1100 by the connection member 1150. The connection member 1150 can be substantially the same as the connection member 1150 described above with reference to Figure 44 A repeated description thereof can be omitted.

[0660] As described above, the device (or display device) according to another embodiment of the disclosure can output left sound and right sound to a frontward region in front of the display panel 1100 (or a vibration object or a vibration member) by the first vibration generation device 1200-1 and the second vibration generation device 1200-2, can concentrate or focus sound generated by the vibration of each of the first vibration generation device 1200-1 and the second vibration generation device 1200-2 in a specific direction, and thus, can implement a user privacy protection function that allows a user not to listen to sound in a peripheral region (or an inaudible region) other than a region (or an audible region) in the specific direction.

[0661] The device according to another embodiment of the disclosure can further include a plate 1170 disposed between the display panel 1100 and the vibration generation device 1200.

[0662] The plate 1170 can have the same shape and size as the rear surface of the display panel 1100, or can have the same shape and size as the vibration generation device 1200. As another embodiment of the disclosure, the plate 1170 can have a different size from the display panel 1100. For example, the plate 1170 can be smaller than the size of the display panel 1100. As another embodiment of the disclosure, the plate 1170 can have a different size from the vibration generation device 1200. For example, the plate 1170 can be larger or smaller than the size of the vibration generation device 1200. The vibration generation device 1200 can be the same size as or smaller than the size of the display panel 1100.

[0663] The plate 1170 can be coupled or connected to the rear surface of the display panel 1100 by a plate connection member 1190. Accordingly, the vibration generation device 1200 can be connected or coupled to the rear surface of the plate 1170 by the connection member 1150, and thus can be supported or suspended at the rear surface of the plate 1170 by the rear surface of the plate 1170.

[0664] The plate 1170 according to an embodiment of the disclosure can include a plurality of open portions. The plurality of open portions can be configured to have a predetermined size and a predetermined interval. For example, the plurality of open portions can be disposed along the first direction X and the second direction Y to have a predetermined size and a predetermined interval. Due to the plurality of open portions, a sound wave (or sound pressure) based on the vibration of the vibration generation device 1200 can not be dispersed by the plate 1170 and can be concentrated on the display panel 1100 (or a vibration object or a vibration member). Accordingly, a loss of the vibration caused by the plate 1170 can be minimized, thereby increasing a sound pressure level characteristic of a sound generated based on the vibration of the display panel 1100 (or a vibration object or a vibration member). For example, the plate 1170 including a plurality of openings can have a mesh shape. For example, the plate 1170 including a plurality of openings can be a mesh plate.

[0665] The plate 1170 according to an embodiment of the disclosure can include a metal material. For example, the plate 1170 can include any one or more of a stainless steel, aluminum (Al), magnesium (Mg), a magnesium alloy, a magnesium-lithium (Mg-Li) alloy, and an aluminum alloy, but embodiments of the disclosure are not limited thereto. Accordingly, the plate 1170 can function as a heat plate that dissipates heat generated in the display panel 1100 (or a vibration object or a vibration member).

[0666] According to an embodiment of the disclosure, the plate 1170 can enhance the mass of the vibration generation device 1200, which is disposed at or suspended from the rear surface of the display panel 1100 (or a vibration object or a vibration member). Accordingly, the plate 1170 can lower a resonance frequency of the vibration generation device 1200 based on the increase in the mass of the vibration generation device 1200. Accordingly, the plate 1170 can increase a sound characteristic and a sound pressure level characteristic of a low-pitched sound band of a sound generated based on the vibration of the vibration generation device 1200, and can enhance a flatness of the sound pressure level characteristic. For example, the flatness of the sound pressure level characteristic can be a magnitude of a deviation between a highest sound pressure level and a lowest sound pressure level. For example, the plate 1170 can be referred to as a counterweight member, a mass member, a sound flattening member, or the like, but embodiments of the disclosure are not limited thereto.

[0667] Figure 46 A device according to another embodiment of the disclosure is illustrated. Figure 46 An embodiment in which a partition is further configured in the device illustrated in Figure 44 An embodiment in which a partition is further configured in the device illustrated in

[0668] Referring to Figure 46According to another embodiment of the disclosure, the device can include the display panel 1100 and the vibration generation device 1200, and can further include a partition 1600 for dividing the first rear area RA1 and the second rear area RA2 of the display panel 1100.

[0669] The vibration generation device 1200 can include first to fourth vibration generation apparatuses 1200-1 to 1200-4 disposed at a rear surface of the display panel 1100 (or a vibration object or a vibration member).

[0670] Each of the first to fourth vibration generation apparatuses 1200-1 to 1200-4 can include one or more of the vibration devices described above with reference to Figures 1-42 Therefore, detailed descriptions thereof can be omitted.

[0671] The first and third vibration generation apparatuses 1200-1 and 1200-3 can be staggered or disposed in a diagonal direction within the first rear area RA1 of the display panel 1100 (or a vibration object or a vibration member), and thus, the first and third vibration generation apparatuses 1200-1 and 1200-3 can increase a vibration area of the first rear area RA1 of the display panel 1100 (or a vibration object or a vibration member). For example, the diagonal direction can be a direction between the first direction X and the second direction Y.

[0672] Each of the first and third vibration generation apparatuses 1200-1 and 1200-3 can vibrate the first rear area RA1 of the display panel 1100 (or a vibration object or a vibration member) to generate the first sound (or right sound) or the first haptic feedback in the first rear area RA1 of the display panel 1100 (or a vibration object or a vibration member). For example, a vibration area of the first rear area RA1 of the display panel 1100 (or a vibration object or a vibration member) can be increased based on the diagonal arrangement structure of the first and third vibration generation apparatuses 1200-1 and 1200-3, and thus, a low-pitched sound band characteristic of the first sound (or right sound) can be enhanced. For example, because the third vibration generation apparatus 1200-3 is disposed in addition to the first vibration generation apparatus 1200-1, the first sound or the first haptic feedback generated in the second rear area RA2 of the display panel 1100 (or a vibration object or a vibration member) can be more enhanced than the first sound or the first haptic feedback described above with reference to Figure 45

[0673] ​The second vibration generation device 1200-2 and the fourth vibration generation device 1200-4 can be staggered or disposed in a diagonal direction within the second rear area RA2 of the display panel 1100 (or a vibration object or a vibration member), and thus the second vibration generation device 1200-2 and the fourth vibration generation device 1200-4 can increase a vibration area of the second rear area RA2 of the display panel 1100 (or a vibration object or a vibration member). For example, the diagonal direction can be a direction between the first direction X and the second direction Y.

[0674] Each of the second vibration generation device 1200-2 and the fourth vibration generation device 12...

Claims

1. A vibration apparatus comprising: a lower vibration structure; an upper vibration structure on the lower vibration structure; and an adhesive member that is an integral member provided between the lower vibration structure and the upper vibration structure without being separated by other members, wherein the lower vibration structure and the upper vibration structure are configured to generate acoustic waves having different frequencies, wherein each of the lower vibration structure and the upper vibration structure comprises: a first base member; a second base member overlapping the first base member; a plurality of vibration generation portions provided between the first base member and the second base member; and an adhesive layer provided between side surfaces of each of the plurality of vibration generation portions in a region between the first base member and the second base member to surround the side surfaces of each of the plurality of vibration generation portions, wherein the adhesive member includes a first surface and a second surface opposite the first surface, wherein the first surface of the adhesive member is in direct contact with the first base member of the lower vibration structure, and the second surface of the adhesive member is in direct contact with the first base member or the second base member of the upper vibration structure, and wherein each of the plurality of vibration generation portions provided at the upper vibration structure overlaps a corresponding vibration generation portion provided at the lower vibration structure. The acoustic waves generated from at least one of the lower vibration structure and the upper vibration structure include ultrasonic waves.

2. The vibration apparatus according to claim 1, wherein The acoustic waves generated from each of the lower vibration structure and the upper vibration structure are one or more of audible frequencies, ultrasonic waves of an inaudible frequency band, and ultrasonic waves of an inaudible frequency band including audible frequencies.

3. The vibration apparatus according to claim 1, wherein The adhesive member has a Young's modulus of 10 7 Pa or higher, or a Shore hardness of 50 or higher.

4. The vibration apparatus according to claim 2, wherein 5. The vibration apparatus of claim 2, the acoustic waves generated from the lower vibration structure are ultrasonic waves of an inaudible frequency band, and wherein wherein the acoustic waves generated from the upper vibration structure are ultrasonic waves of an inaudible frequency band including audible frequencies. The adhesive layer includes:

6. The vibration apparatus according to claim 1, wherein a first adhesive layer provided at a rear surface of the first base member; and a second adhesive layer provided at an upper surface of the second base member. Each of the first adhesive layer and the second adhesive layer includes an electrically insulating material having adhesiveness and including a material capable of compression and decompression.

7. The vibration apparatus according to claim 6, wherein The plurality of vibration generation portions have a circular band shape, an elliptical band shape, or a ring shape having an open portion.

8. The vibration apparatus according to claim 1, wherein The plurality of vibration generation portions of the upper vibration structure include a pair of vibration generation portions having a non-linear shape.

9. The vibration apparatus according to claim 1, wherein Each of the lower vibration structure and the upper vibration structure comprises:

10. The vibration apparatus according to claim 1, wherein a plurality of first power supply electrodes provided at the first base member and electrically connected to a first surface of each of the plurality of vibration generation portions; a plurality of second power supply electrodes provided at the second base member to cross the plurality of first power supply electrodes, respectively, and electrically connected to a second surface of each of the plurality of vibration generation portions; ​ a plurality of first power supply lines provided at the first base member and electrically connected to each of the plurality of first power supply electrodes; and a plurality of second power supply lines provided at the second base member and electrically connected to each of the plurality of second power supply electrodes.

11. The vibration apparatus according to claim 10, wherein Each of the lower vibration structure and the upper vibration structure includes: a pad portion electrically connected to the plurality of first power supply lines and the plurality of second power supply lines; and a flexible cable electrically connected to the pad portion.

12. The vibratory apparatus of claim 11, wherein, The pad portion includes a plurality of first pads provided in parallel at a first peripheral portion of a second surface peripheral portion of the first base member and a plurality of second pads provided in parallel at a first peripheral portion of a first surface peripheral portion of the second base member.

13. The vibratory apparatus of claim 12, wherein, Each of the plurality of first pads is electrically connected to each of the plurality of first power supply electrodes through one of the plurality of first power supply lines, and each of the plurality of second pads is electrically connected to each of the plurality of second power supply electrodes through one of the plurality of second power supply lines.

14. The vibratory apparatus of claim 12, wherein, One or more of the first base member and the second base member include a plurality of pad holes overlapping the plurality of first pads and the plurality of second pads, respectively.

15. The vibratory apparatus of claim 11, wherein, The flexible cable of each of the lower vibration structure and the upper vibration structure includes a plurality of protruding lines electrically connected to the pad portion and provided between the first base member and the second base member.

16. The vibratory apparatus of claim 10, wherein, Each of the plurality of vibration generation portions is provided at a crossing portion between each of the plurality of first power supply electrodes and each of the plurality of second power supply electrodes and spaced apart from each other in a first direction and a second direction crossing the first direction.

17. The vibration device of claim 10, wherein Each of the plurality of vibration generation portions is longer in a first direction and has a linear shape spaced apart from an adjacent vibration generation portion in a second direction crossing the first direction, and wherein each of the plurality of first power supply electrodes provided at the lower vibration structure is provided at the plurality of vibration generation portions to be spaced apart from each other.

18. The vibratory apparatus of claim 17, wherein, The plurality of vibration generation portions are respectively provided at crossing portions between the plurality of first power supply electrodes and the plurality of second power supply electrodes and spaced apart from each other in a first direction and a second direction crossing the first direction.

19. The vibratory apparatus of claim 1, wherein, Each of the plurality of vibration generation portions includes: a vibration portion including a piezoelectric material; a first electrode layer provided at a first surface of the vibration portion; and a second electrode layer provided at a second surface of the vibration portion.

20. The vibratory apparatus of claim 19, wherein, The vibration portion is a ceramic-based material configured to generate a relatively high vibration, or a piezoelectric ceramic configured to have a perovskite-based crystal structure.

21. The vibratory apparatus of claim 19, wherein, The vibration portion has a piezoelectric strain coefficient of 1000 pC / N or more in a thickness direction of the vibration device.

22. The vibratory apparatus of claim 10, wherein, Each of the plurality of vibration generation portions includes: a vibration portion including a piezoelectric material; a first electrode layer disposed on a first surface of the vibration portion; and a second electrode layer disposed on a second surface of the vibration portion, wherein each of the plurality of first power supply electrodes is electrically connected to the first electrode layer of each of the plurality of vibration generation portions through an anisotropic conductive film or a conductive material included in an adhesive layer, and wherein each of the plurality of second power supply electrodes is electrically connected to the second electrode layer of each of the plurality of vibration generation portions through an anisotropic conductive film or a conductive material included in the adhesive layer.

23. The vibratory apparatus of claim 19, wherein, The vibration portion of the vibration generation portion includes a plurality of inorganic material portions and a plurality of flexible portions alternately and repeatedly arranged in a first direction or a second direction of the vibration device.

24. The vibratory apparatus of claim 23, wherein, The modulus and viscoelasticity of the plurality of flexible portions are lower than the modulus and viscoelasticity of the plurality of inorganic material portions.

25. The vibratory apparatus of claim 19, wherein, The vibration portion of the lower vibration structure and the vibration portion of the upper vibration structure vibrate in the same direction.

26. The vibratory apparatus of claim 19, wherein, In the lower vibration structure, the first surface of the vibration portion has a tilted surface structure tilted from both sides to a center line, and the second surface of the vibration portion has a planar structure.

27. The vibratory apparatus of claim 26, wherein, In the lower vibration structure, a distance between the first surface and the second surface of the vibration portion gradually decreases in a direction from both sides to a center line.

28. The vibratory apparatus of claim 27, wherein, The vibration generation portion of each of the lower vibration structure and the upper vibration structure includes: a plurality of inorganic material portions including a piezoelectric material; and a flexible portion between the plurality of inorganic material portions.

29. The vibratory apparatus of claim 28, wherein, Each of the plurality of inorganic material portions disposed at the upper vibration structure overlaps each of the plurality of inorganic material portions disposed at the lower vibration structure.

30. The vibratory apparatus of claim 28, wherein, The flexible portion includes one or more of an organic material, an organic polymer, an organic piezoelectric material, and an organic non-piezoelectric material.

31. The vibratory apparatus of claim 28, wherein, The vibration generation portion of each of the lower vibration structure and the upper vibration structure includes a 2-2 type composite structure or a 1-3 type composite structure.

32. The vibration device of claim 1, wherein, the lower vibration structure includes a first region and a second region, and wherein the upper vibration structure includes: a first upper vibration structure on the first region of the lower vibration structure; and a second upper vibration structure on the second region of the lower vibration structure.

33. The vibratory apparatus of claim 32, wherein, Sound waves generated from each of the lower vibration structure, the first upper vibration structure, and the second upper vibration structure are one or more of an audible frequency, an ultrasonic wave of an inaudible frequency band, and an ultrasonic wave of an inaudible frequency band including the audible frequency.

34. The vibration device of claim 32, wherein, the sound wave generated from the lower vibration structure is an ultrasonic wave of an inaudible frequency band, wherein the sound wave generated from the first upper vibration structure is an ultrasonic wave of an inaudible frequency band including an audible frequency, and wherein the sound wave generated from the second upper vibration structure is an ultrasonic wave of an inaudible frequency band including the audible frequency, which is the same as or different from the sound wave generated from the first upper vibration structure.

35. The vibratory apparatus of claim 34, wherein, Each of the first and second upper vibration structures includes: the first base member; the second base member overlapping the first base member; and the plurality of vibration generation portions disposed between the first and second base members.

36. The vibration device of claim 1, wherein the plurality of vibration generation portions disposed between the first and second base members of the lower vibration structure, and wherein a pair of vibration generation portions disposed between the first and second base members of the upper vibration structure includes an inclined surface.

37. The vibratory apparatus of claim 36, wherein, Each of the plurality of vibration generation portions and the pair of vibration generation portions includes: a vibration portion including a piezoelectric material; a first electrode layer disposed at a first surface of the vibration portion; and a second electrode layer disposed at a second surface of the vibration portion.

38. The vibratory apparatus of claim 37, wherein, The vibration portion of each of the pair of vibration generation portions overlaps the vibration portion of each vibration generation portion disposed at a peripheral portion of the plurality of vibration generation portions.

39. The vibratory apparatus of claim 37, wherein, In each of the pair of vibration generation portions, the first surface of the vibration portion has an inclined surface structure inclined from both ends of the upper vibration structure toward a center line, and the second surface of the vibration portion has a planar structure.

40. The vibratory apparatus of claim 39, wherein, The inclined surface structure includes a first inclined surface and a second inclined surface, and a first included angle between the first inclined surface and the second surface is an acute angle, and a second included angle between the second inclined surface and the second surface is an acute angle.

41. The vibratory apparatus of claim 40, wherein, The first and second included angles are in a range of 10 degrees to 75 degrees.

42. The vibratory apparatus of claim 37, wherein, In each of the pair of vibration generation portions, the first surface of the vibration portion has an inclined surface structure inclined from one end of the upper vibration structure toward a center line with respect to a first direction of the vibration device, and the second surface of the vibration portion has a planar structure.

43. The vibratory apparatus of claim 37, wherein, The vibration portion of each of the pair of vibration generation portions has an L-shaped planar structure and overlaps a peripheral portion of a lower vibration structure.

44. An electronic device, the electronic device comprising: a vibration member; a vibration generation device at the vibration member; and a connection member between the vibration member and the vibration generation device, wherein the vibration generation device includes the vibration device according to any one of claims 1 to 43. The vibration member is one or more of: a display panel including a plurality of pixels configured to display an image, a screen panel that projects an image from a display device, an illumination panel, a vibration plate, wood, plastic, glass, cloth, metal, a vehicle interior material, a vehicle glazing, a building interior ceiling, a building glazing, an aircraft interior material, and an aircraft glazing.

45. The electronic device of claim 44, wherein, The connection member further includes a hollow portion between the display panel and the vibration generation device for providing an air gap between the display panel and the vibration generation device.

46. The electronic device of claim 45, wherein, 47. The electronic device of claim 44, ​ wherein, The vibration member is a display panel including a plurality of pixels configured to display an image, wherein the display panel includes a first rear region and a second rear region, and wherein the vibration generation apparatus includes: a first vibration generation device disposed at the first rear region of the display panel; and a second vibration generation device disposed at the second rear region of the display panel. 48.The electronic device of claim 47, further comprising a plate between the display panel and the vibration generation apparatus. 49.The electronic device of claim 47, further comprising: a support member disposed at a rear surface of the display panel; and a partition disposed between the rear surface of the display panel and the support member and between the first rear region and the second rear region of the display panel. The plate includes a plurality of open portions configured to have a predetermined size and a predetermined interval.

50. The electronic device of claim 48, wherein, 51.A vehicle, comprising: a vehicle interior material covering a vehicle structure; and a sound generation apparatus disposed at the vehicle interior material, wherein the sound generation apparatus includes the vibration apparatus according to any one of claims 1 to 43, and wherein the vehicle interior material vibrates to output a sound according to vibration of the sound generation apparatus. The vehicle structure includes a main frame, a side frame, a door frame, a glass window, and a seat frame. The vehicle interior material includes one or more materials among plastic, fiber, leather, wood, cloth, metal, and glass.

52. The vehicle of claim 51, wherein, The sound generation apparatus is disposed between the vehicle structure and the vehicle interior material or at the vehicle interior material.

53. The vehicle of claim 51, wherein, 55.The vehicle of claim 54, 54. The vehicle of claim 51, wherein, the vehicle interior material includes at least one or more among an instrument panel, a pillar interior material, a roof interior material, a door interior material, a seat interior material, a handle interior material, a floor interior material, and a rear package interior material, and wherein the sound generation apparatus vibrates at least one or more among the instrument panel, the pillar interior material, the roof interior material, the door interior material, the seat interior material, the handle interior material, the floor interior material, and the rear package interior material. wherein, 56.The vehicle of claim 51, further comprising: a glass window; and a transparent sound generation apparatus at the glass window. 57.The vehicle of claim 56, the glass window includes at least one or more among a front glass window, a side glass window, a rear glass window, and a roof glass window, and wherein the transparent sound generation apparatus vibrates at least one or more among the front glass window, the side glass window, the rear glass window, and the roof glass window. ​ wherein, ​ ​

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