Devices capable of providing sound

Abstract

A device capable of providing sound may include: a vibration member; a rear cover located at a rear surface of the vibration member; a first vibration device located at a first rear region of the rear cover; and a second vibration device located at a second rear region of the rear cover. The first vibration device may overlap at least one of a horizontal region and a middle region of the rear cover. The second vibration device may overlap a peripheral region or a middle region of the rear cover.

Description

Technical Field

[0001] The present disclosure relates to a device, including but not limited to a device for outputting sound. Background Art

[0002] The device includes a separate speaker or sound device for providing sound. In the case where the speaker is set in the device, the design and spatial arrangement of the device are restricted due to the space occupied by the speaker.

[0003] Speakers used in devices can be actuators, for example, consisting of a magnet and a coil. However, when actuators are used in devices, they are thick. Therefore, piezoelectric devices, which enable thinner designs, are attracting increasing attention.

[0004] However, because piezoelectric devices have fragile or brittle characteristics, they may be easily damaged by external impacts, and therefore, the reliability of sound reproduction is low. In addition, when speakers such as piezoelectric devices are applied to flexible devices, the piezoelectric devices may be easily damaged due to their fragile or brittle characteristics.

[0005] The description provided in the Background section should not be admitted to be prior art merely because it is mentioned in or related to the Background section.The Background section may include information describing one or more aspects of the subject technology. Summary of the Invention

[0006] The inventors have recognized the above-mentioned problems and have conducted various experiments in order to realize an apparatus and a vibration device in which the quality of sound is enhanced and the sound pressure level characteristics are enhanced. Through various experiments and creative efforts, the inventors have invented a new vibration device, an apparatus including the new vibration device, and a vehicle apparatus including the apparatus, in which the quality of sound can be enhanced and the sound pressure level characteristics can be enhanced.

[0007] One or more aspects of the present disclosure are directed to providing an apparatus that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0008] One or more aspects of the present disclosure are directed to providing a vibration device and a device including the same, which can vibrate a device or a vibration object (or a vibration member) to generate vibration or sound, thereby enhancing sound characteristics and / or sound pressure level characteristics.

[0009] One or more aspects of the present disclosure are directed to providing a vibration device having a simplified structure and an apparatus including the same.

[0010] Furthermore, it is an object to provide a vibration device and an apparatus comprising the vibration device which are robust against external shocks.

[0011] To achieve these and other advantages and in accordance with one or more aspects of the present disclosure, as embodied and broadly described herein, a device may include: a vibration member; a back cover located at a back surface of the vibration member; a first vibration device located at a first back area of ​​the back cover; and a second vibration device located at a second back area of ​​the back cover. In one or more aspects of the present disclosure, a device may include: a vibration member; a back cover located at a back surface of the vibration member; a first vibration device located at the first back area of ​​the back cover, the first vibration device overlapping at least one of a horizontal area and a middle area of ​​the back cover; and a second vibration device located at the second back area of ​​the back cover, the second vibration device overlapping with a peripheral area or the middle area of ​​the back cover.

[0012] In one or more aspects of the present disclosure, a device may include: a vibration member; and a back cover, the back cover being located at the back surface of the vibration member, the back cover including a left area and a right area, the left area including a first area to a sixteenth area divided in matrix order from the upper left end to the lower right end, and the right area including a first area to a sixteenth area divided in matrix order from the upper right end to the lower left end, and the device may further include a first vibration device, the first vibration device being located at one or more areas in the first to sixteenth areas near the center of the back cover; and a second vibration device, the second vibration device being located at one or more areas on the outside of the back cover in the first to sixteenth areas.

[0013] According to one or more exemplary embodiments of the present disclosure, a device that enables sound to be delivered may be provided, and a device for improving sound quality and enhancing a viewer's immersive experience may be provided.

[0014] According to one or more exemplary embodiments of the present disclosure, there may be provided an apparatus for outputting sound in a forward direction of a display panel or a display member.

[0015] According to one or more exemplary embodiments of the present disclosure, there may be provided an apparatus for outputting sound in a forward direction of a display panel or a display member using a display panel or a display member as a vibration plate.

[0016] Other systems, methods, features, and advantages will be or will become apparent to one skilled in the art upon examination of the following figures and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this specification, be within the scope of the present disclosure, and be protected by the following claims. Nothing in this section should be construed as limiting those claims. Additional aspects and advantages are discussed below in conjunction with various aspects of the present disclosure.

[0017] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed.

[0018] Note 1. A device capable of providing sound, comprising:

[0019] vibrating components;

[0020] a rear cover located at a rear surface of the vibration member;

[0021] a first vibration device located at a first rear area of ​​the rear cover; and

[0022] A second vibration device is located at a second rear area of ​​the rear cover.

[0023] Supplementary note 2. The apparatus according to Supplementary note 1, wherein the first vibration device overlaps with at least one of a horizontal area and a middle area of ​​the rear cover.

[0024] Note 3. The device according to Note 1, wherein the second vibration device overlaps with a peripheral area or a middle area of ​​the rear cover.

[0025] Supplementary note 4. The apparatus according to Supplementary note 1, wherein the vibration member includes a display member configured to display an image, and

[0026] Wherein, the back cover includes a back cover portion located at the back surface of the display member.

[0027] Supplementary note 5. The apparatus according to Supplementary note 4, wherein the rear cover portion is configured to support the first vibration device and the second vibration device.

[0028] Supplementary note 6. The apparatus according to Supplementary note 4, wherein the rear cover portion includes a first hole overlapping with the first vibration device.

[0029] Supplementary note 7. The apparatus according to Supplementary note 4, wherein the rear cover portion includes a second hole overlapping with the second vibration device.

[0030] Supplementary note 8. The apparatus according to Supplementary note 1, wherein the second vibration device includes a plate located at the rear surface of the rear cover.

[0031] Supplementary note 9. The apparatus according to Supplementary note 8, wherein the plate comprises one or more of aluminum, non-impregnated paper, and impregnated paper.

[0032] Supplement 10. The apparatus according to Supplement 1, wherein the second vibration device comprises a piezoelectric device, and

[0033] The piezoelectric device comprises:

[0034] Vibration part;

[0035] a first electrode portion located at a first surface of the vibration portion; and

[0036] A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

[0037] Supplementary note 11. The device according to Supplementary note 10, wherein the vibration part includes a piezoelectric material.

[0038] Supplementary note 12. The device according to Supplementary note 10, wherein the vibration part comprises:

[0039] a plurality of inorganic material portions, the plurality of inorganic material portions having piezoelectric properties; and

[0040] An organic material portion is located between the plurality of inorganic material portions.

[0041] Supplementary note 13. The apparatus according to Supplementary note 10, wherein the second vibration device includes a plate located at a rear surface of the vibration portion.

[0042] Supplement 14. The apparatus according to Supplement 1, wherein the second vibration device comprises a piezoelectric device, the piezoelectric device comprises a first group, a second group and a third group, and

[0043] Wherein, each of the first group and the second group includes:

[0044] a vibrating portion, the vibrating portion comprising at least one layer;

[0045] a first electrode portion located at a first surface of the vibration portion; and

[0046] A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

[0047] Note 15. The device according to Note 14, wherein the third group includes a vibration part, the vibration part of the third group includes at least one layer, and

[0048] The third group is located between the first group and the second group.

[0049] Supplementary note 16. The apparatus according to Supplementary note 1, wherein the second vibration device includes two or more vibration generators, and the two or more vibration generators are configured to vibrate in the same direction.

[0050] Supplementary note 17. The apparatus according to Supplementary note 1, wherein the vibration member includes a display member configured to display an image, and

[0051] Wherein, the display component includes:

[0052] a display panel configured to display the image;

[0053] a guide member supported by the rear cover and configured to support a peripheral portion of a rear surface of the display panel; and

[0054] A backlight portion is supported by the rear cover and disposed at the rear surface of the display panel.

[0055] Note 18. The device according to Note 17, wherein the backlight portion comprises:

[0056] a reflective sheet, the reflective sheet being located on the back cover;

[0057] a light guide plate, the light guide plate being located on the reflective sheet; and

[0058] An optical sheet portion is located on the light guide plate.

[0059] Note 19. The device according to Note 18, wherein the rear cover includes a first hole located at the first rear area and a second hole located at the second rear area, and

[0060] The reflective sheet is configured to cover or directly cover the first hole and the second hole.

[0061] Note 20. A device capable of providing sound, comprising:

[0062] vibrating components;

[0063] a rear cover located at a rear surface of the vibration member;

[0064] a first vibration device located at a first rear region of the rear cover, the first vibration device overlapping at least one of a horizontal region and a middle region of the rear cover; and

[0065] A second vibration device is located at a second rear area of ​​the rear cover, and the second vibration device overlaps with the peripheral area or the middle area of ​​the rear cover.

[0066] Supplementary note 21. The apparatus according to Supplementary note 20, wherein the first vibration device and the second vibration device are arranged adjacent to each other horizontally or diagonally.

[0067] Supplementary note 22. The apparatus according to Supplementary note 20, wherein the vibration member includes a display member configured to display an image, and

[0068] Wherein, the back cover includes a back cover portion located at the back surface of the display member.

[0069] Supplementary note 23. The apparatus according to Supplementary note 22, wherein the rear cover portion is configured to support the first vibration device and the second vibration device.

[0070] Supplementary note 24. The apparatus according to Supplementary note 22, wherein the rear cover portion includes a first hole overlapping with the first vibration device.

[0071] Supplementary note 25. The apparatus according to Supplementary note 22, wherein the rear cover portion includes a second hole overlapping with the second vibration device.

[0072] Supplementary note 26. The apparatus according to Supplementary note 25, wherein the second vibration device comprises:

[0073] A plate is provided at the rear surface of the rear cover.

[0074] Supplementary note 27. The apparatus according to Supplementary note 26, wherein the plate comprises one or more of aluminum, non-impregnated paper, and impregnated paper.

[0075] Supplement 28. The apparatus according to Supplement 20, wherein the second vibration device comprises a piezoelectric device, and

[0076] Wherein, the piezoelectric device comprises:

[0077] Vibration part;

[0078] a first electrode portion located at a first surface of the vibration portion; and

[0079] A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

[0080] Supplementary note 29. The device according to Supplementary note 28, wherein the vibration part includes a piezoelectric material.

[0081] Supplementary note 30. The device according to Supplementary note 28, wherein the vibration part comprises:

[0082] a plurality of inorganic material portions, the plurality of inorganic material portions having piezoelectric properties; and

[0083] An organic material portion is located between the plurality of inorganic material portions.

[0084] Supplement 31. The apparatus according to Supplement 20, wherein the second vibration device comprises:

[0085] piezoelectric devices; and

[0086] A plate is located at a rear surface of the piezoelectric device.

[0087] Note 32. The apparatus according to Note 20, wherein the second vibration device comprises a piezoelectric device, the piezoelectric device comprises a first group and a second group, and

[0088] Wherein, each of the first group and the second group includes:

[0089] a vibrating portion, the vibrating portion comprising at least one layer;

[0090] a first electrode portion located at a first surface of the vibration portion; and

[0091] A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

[0092] Note 33. The device according to Note 32,

[0093] Wherein, the piezoelectric device further includes a third group,

[0094] wherein the third group includes a vibrating portion, the vibrating portion of the third group includes at least one layer, and

[0095] The third group is located between the first group and the second group.

[0096] Supplement 34. The apparatus according to Supplement 20, wherein the second vibration device includes two or more vibration generators, and the two or more vibration generators are configured to vibrate in the same direction.

[0097] Supplementary note 35. The apparatus according to Supplementary note 20, wherein the vibration member includes a display member configured to display an image, and

[0098] Wherein, the display component includes:

[0099] a display panel configured to display the image;

[0100] a guide member supported by the rear cover and configured to support a peripheral portion of a rear surface of the display panel; and

[0101] A backlight portion is supported by the rear cover and disposed at the rear surface of the display panel.

[0102] Note 36. The device according to Note 35, wherein the backlight portion comprises:

[0103] a reflective sheet, the reflective sheet being located on the back cover;

[0104] a light guide plate, the light guide plate being located on the reflective sheet; and

[0105] An optical sheet portion is located on the light guide plate.

[0106] Note 37. The apparatus according to Note 36,

[0107] wherein the rear cover comprises a first hole located at the first rear area and a second hole located at the second rear area, and

[0108] The reflective sheet is configured to cover or directly cover the first hole and the second hole.

[0109] Note 38. A device capable of providing sound, comprising:

[0110] vibrating components;

[0111] a rear cover located at a rear surface of the vibration member, wherein the rear cover includes a left area and a right area,

[0112] The left region includes the first region to the sixteenth region divided in matrix order from the upper left end to the lower right end.

[0113] The right area includes the first area to the sixteenth area divided in matrix order from the upper right end to the lower left end, and

[0114] The device further comprises:

[0115] a first vibration device located at one or more regions near the center of the rear cover among the first to sixteenth regions; and

[0116] A second vibration device is located at one or more areas close to the outside of the rear cover among the first area to the sixteenth area.

[0117] Supplementary note 39. The apparatus according to Supplementary note 38, wherein the first vibration device is provided in at least one of the sixth to eighth regions and the tenth to twelfth regions among the first to sixteenth regions.

[0118] Supplementary note 40. The apparatus according to Supplementary note 38, wherein the first vibration device is provided in at least one of the sixth region, the seventh region, the tenth region, and the eleventh region among the first region to the sixteenth region.

[0119] Note 41. The apparatus according to Note 38, wherein the second vibration device is arranged in at least one of the first area, the second area, the fifth area, the sixth area, the ninth area, the tenth area, the thirteenth area and the fourteenth area among the first area to the sixteenth area.

[0120] Supplementary note 42. The apparatus according to Supplementary note 38, wherein the second vibration device is provided in at least one of the first area, the fifth area, the ninth area, and the thirteenth area among the first area to the sixteenth area. BRIEF DESCRIPTION OF THE DRAWINGS

[0121] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate aspects and embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

[0122] Figure 1 A device according to an exemplary embodiment of the present disclosure is illustrated.

[0123] Figure 2A Example located at Figure 1 Example of a vibration device at the back cover of the illustrated device.

[0124] Figure 2B Illustrated from the Figure 1 An example of a high-pitched sound output by the vibration device at the back cover of the illustrated device.

[0125] Figure 2C An example is illustrated in which the device according to the exemplary embodiment of the present disclosure includes the first to sixteenth regions.

[0126] Figure 3 It is along Figure 2A An example of a cross-sectional view taken along line II'.

[0127] Figure 4 Illustrated Figure 3 Example of area A.

[0128] Figure 5A Illustrated Figure 3 An exemplary embodiment of region B.

[0129] Figure 5B Illustrated Figure 3 Another exemplary embodiment of region B.

[0130] Figure 6A is a cross-sectional view of a second vibration device according to an exemplary embodiment of the present disclosure.

[0131] Figure 6B and Figure 6C yes Figure 6A An exemplary plan view of a second vibration device.

[0132] Figure 6D is a cross-sectional view of a second vibration device according to another exemplary embodiment of the present disclosure.

[0133] Figure 6E is a cross-sectional view of a second vibration device according to an exemplary embodiment of the present disclosure.

[0134] Figure 6F and Figure 6G yes Figure 6E An exemplary plan view of a second vibration device.

[0135] Figure 6H is a cross-sectional view of a second vibration device according to another exemplary embodiment of the present disclosure.

[0136] Figure 7 is a perspective view of a vibration device according to an exemplary embodiment of the present disclosure.

[0137] Figure 8 It is along Figure 7 An example of a cross-sectional view taken along line II-II'.

[0138] Figure 9 、 Figure 10 、 Figure 11 and Figure 12 is a perspective view of a vibration portion of a vibration device according to one or more exemplary embodiments of the present disclosure.

[0139] Figure 13A and Figure 13B is a plan view of a vibration device according to an exemplary embodiment of the present disclosure.

[0140] Figure 14 It is along Figure 13A and Figure 13B An example of a cross-sectional view taken along line III-III'.

[0141] Figure 15 is a perspective view of a vibration portion of a vibration device according to an exemplary embodiment of the present disclosure.

[0142] Figure 16 It is along Figure 15 An example of a cross-sectional view taken along line IV-IV'.

[0143] Figure 17 、 Figure 18 、 Figure 19 and Figure 20 is a perspective view of a vibration portion of a vibration device according to one or more exemplary embodiments of the present disclosure.

[0144] Figure 21 A graph illustrating sound pressure level characteristics of a device according to an exemplary embodiment of the present disclosure.

[0145] Figure 22 It shows Figure 2A An example of a graph of sound pressure level characteristics of a first vibration device, a second vibration device, and an apparatus.

[0146] Figure 23A is a photograph of a device according to an exemplary embodiment of the present disclosure.

[0147] Figure 23B A vibration device at a rear cover of a device according to an exemplary embodiment of the present disclosure is illustrated.

[0148] Figure 24 An example of a resonance mode explaining the resonance frequency of the first vibration device according to the present disclosure of the light guide plate is illustrated.

[0149] Figure 25A is a schematic diagram of an example of a first vibration device, a rear cover, and a light guide plate of the present disclosure.

[0150] Figure 25B An example of a position change of the first vibration device at the rear cover of the present disclosure is illustrated.

[0151] Figure 26 It shows that Figure 25B An example of a graph of sound pressure level characteristics measured under the following conditions:

[0152] Figure 27A 、 Figure 27B 、 Figure 27C and Figure 27DA vibration device at a rear cover of a device according to one or more exemplary embodiments of the present disclosure is illustrated.

[0153] Figure 28 It shows Figure 27A 、 Figure 27B 、 Figure 27C and Figure 27D An example of a graph of the sound pressure level characteristics of a device.

[0154] Figure 29 An example of the vibration portion of the second vibration device is illustrated.

[0155] Figure 30A and Figure 30B It is along Figure 29 An example of a cross-sectional view taken along line V-V'.

[0156] Figure 31 is a graph showing sound pressure level characteristics of a second vibration device according to an exemplary embodiment of the present disclosure. Figure 32 It shows Figure 2A and Figure 27B A graph showing the sound pressure level characteristics of the illustrated device.

[0157] Figure 33 It shows Figure 2A and Figure 27B An example of a graph of the sound pressure level characteristics of the illustrated device.

[0158] Figure 34 is a vibration device showing an experimental example and Figure 2B An example of a graph of the sound pressure level characteristics of a device.

[0159] Throughout the drawings and detailed description, unless otherwise described, the same drawing reference numerals should be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0160] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which may be illustrated in the accompanying drawings. In the following description, detailed descriptions of known functions or structures may be omitted when they may unnecessarily obscure aspects of the present disclosure. The described progression of processing steps and / or operations are examples; however, except for steps and / or operations that must occur in a specific order, the order of steps and / or operations is not limited to the order set forth herein and may be changed as known in the art. Similar reference numerals designate similar elements throughout, unless otherwise noted. The names of the various elements used in the following description are selected solely for the convenience of writing this specification and may therefore differ from the names used in the actual product.

[0161] The advantages and features of the present disclosure and their implementation methods will be clarified by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is limited only by the claims and their equivalents.

[0162] The shapes, sizes, ratios, angles, and quantities disclosed in the accompanying drawings for describing exemplary embodiments of the present disclosure are merely examples, and therefore, the present disclosure is not limited to the details shown. Where terms such as "including," "having," "comprising," "containing," "consisting of," "composed of," or "made of" are used, one or more other elements may be added unless a term such as "only" is used. Terms in the singular may include plural forms unless the context clearly indicates otherwise.

[0163] When explaining an element, the element is construed as including an error or tolerance range even where an explicit description of such error or tolerance range is not provided.

[0164] Where a positional relationship is described, for example, where the positional relationship between two parts is described using, for example, "on," "above," "below," "above," "below," "beneath," "near," or "adjacent to," "next to," or "next to," one or more other parts may be located between the two parts unless a more restrictive term such as "just," "directly," or "tight" is used. For example, when a structure is described as being located "on," "above," "below," "below," "near," "near," or "near," "adjacent," or "next to" another structure, the description should be interpreted as including situations in which these structures are in contact with each other and situations in which a third structure is disposed or interposed between them. In addition, the terms "front," "back," "left," "right," "top," "bottom," "downward," "upward," "upward," "downward," or "downward" refer to any framework of reference.

[0165] When describing temporal relationships, for example, when the time order is described as "after", "successive to", "next", "before", "precedes", etc., discontinuous situations may be included unless more restrictive terms such as "just", "immediately" or "directly" are used.

[0166] It will be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be a second element, and similarly, a second element may be a first element, without departing from the scope of this disclosure.

[0167] When describing elements of the present disclosure, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are intended to identify corresponding elements from other elements, and the basis, order, or number of the corresponding elements should not be limited by these terms.

[0168] Unless specified otherwise, when an element or layer is “connected,” “coupled,” or “adhered” to another element or layer, the element or layer can be not only directly connected or adhered to the other element or layer, but also indirectly connected or adhered to the other element or layer with one or more intermediate elements or layers disposed or interposed therebetween.

[0169] Unless otherwise specified, when an element or layer is stated to be “in contact with,” “overlapping,” etc., another element or layer, the element or layer may not only be directly in contact with, overlap with, etc., but also be indirectly in contact with, overlap with, etc., another element or layer, with one or more intervening elements or layers disposed or interposed between the elements or layers.

[0170] 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, "at least one of a first item, a second item, and a third item" means a combination of two or more of the items listed from the first item, the second item, and the third item, as well as only one of the first item, the second item, or the third item.

[0171] The expression "a first element, a second element and / or" a third element should be understood to mean one of the first element, the second element, and the third element, or any or all combinations of the first element, the second element, and the third element. For example, A, B, and / or C can mean only A; only B; only C; any or some combination of A, B, and C; or all of A, B, and C.

[0172] The features of the various embodiments of the present disclosure may be coupled or combined with each other in part or in whole, and may interoperate, link or drive variably together. The exemplary embodiments of the present disclosure may be implemented independently of each other, or may be implemented together in a co-dependent or related relationship.

[0173] Hereinafter, an apparatus, a vibration apparatus, and a vehicle including the apparatus according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When reference numerals are added to elements of each drawing, similar reference numerals may refer to similar elements, even though the same elements may be illustrated in other drawings. In addition, for ease of description, the scale, size, and thickness of each element illustrated in the drawings may differ from the actual scale, size, and thickness. Therefore, exemplary embodiments of the present disclosure are not limited to the scale, size, and thickness illustrated in the drawings.

[0174] Figure 1 A device according to an exemplary embodiment of the present disclosure is illustrated. Figure 2A Illustrated Figure 1 Example of a vibration device at the back cover of the illustrated device. Figure 2B Illustrated from Figure 1 An example of a vibration device at the back cover of the illustrated device outputting a high-pitched sound, Figure 2C An example is illustrated in which the device according to the exemplary embodiment of the present disclosure includes the first to sixteenth regions. Figure 3 It is along Figure 2A An example of a cross-sectional view taken along line II'. Figure 4 Illustrated Figure 3 Example of area A.

[0175] refer to Figure 1 、 Figure 2A 、 Figure 2B 、 Figure 2C 、 Figure 3 and Figure 4 , the device 10 according to an exemplary embodiment of the present disclosure may include a display member 100 , a guide member 200 , a rear cover 300 , a first vibration device 400 , and a second vibration device 500 .

[0176] The display member 100 according to an exemplary embodiment of the present disclosure may include a display panel 110 configured to display an image. For example, the image may include an electronic image, a digital image, a static image, or a video image. The display member 100 may be a liquid crystal display panel, but the embodiments of the present disclosure are not limited thereto. For example, the display member 100 may be a display panel such as a light-emitting display panel, an electrophoretic display panel, a micro-light-emitting diode display panel, an electrowetting display panel, or a quantum dot light-emitting display panel.

[0177] The display member 100 according to the disclosed exemplary embodiment may include a display panel 110 and a backlight portion 130 .

[0178] The display panel 110 may display an image by light irradiated from the backlight portion 130. The display panel 110 may function as a vibration plate that vibrates based on the vibration (or drive) of each of the first vibration device 400 and the second vibration device 500 to output sound in the forward direction of the device. For example, the display panel 110 may simultaneously or sequentially output a first sound S1 of a first tone sound band based on the vibration of the first vibration device 400 and a second sound S2 of a second tone sound band different from the first tone sound band based on the vibration of the second vibration device 500 in the forward direction. In an exemplary embodiment of the present disclosure, as Figure 2B and Figure 4 As shown, the first sound S1 of the first tone sound band can be output in the forward direction at the central portion of the display panel 110, while the second sound S2 of the second tone sound band higher than the first sound S1 of the first tone sound band can be output in the backward direction and / or lateral direction of the device at the edge portion (or peripheral portion) of the display panel 110.

[0179] The first vibration device 400 may be a coil-type vibration generating device, and the second vibration device 500 may be a piezoelectric generating device. The second vibration device 500 may vibrate through the piezoelectric effect.

[0180] The device according to an exemplary embodiment of the present disclosure includes a vibration member; a first vibration device 400 disposed at a first rear area of ​​the vibration member; and a second vibration device 500 disposed at a second rear area of ​​the vibration member. In this example, the vibration member may be a display member 100 or a display module.

[0181] The vibration member may include one or more of metal, plastic, paper, fiber, fabric, and leather.

[0182] The device according to the exemplary embodiment of the present disclosure may generate or output sound toward a front direction of a vibration member or a display panel by using the vibration member or the display panel as a vibration plate.

[0183] The second vibration device 500 may be located between the first vibration devices 400. In addition, according to another exemplary embodiment of the present disclosure, the first vibration device 400 may be located between the second vibration devices 500.

[0184] In addition, an apparatus according to another exemplary embodiment of the present disclosure includes a vibration member, a back cover 300 provided on a rear surface of the vibration member, a first vibration device 400 provided in a first rear area of ​​the back cover 300, and a second vibration device 500 provided in a second rear area of ​​the back cover 300. In this example, the vibration member may be the display member 100 or the display module.

[0185] The display panel 110 according to an exemplary embodiment of the present disclosure may include an upper substrate 111 , a lower substrate 113 , a lower polarization member 115 , and an upper polarization member 117 .

[0186] The upper substrate 111 may be a first substrate or a thin film transistor (TFT) array substrate and may include a pixel array (or display portion) including a plurality of pixels located in a plurality of pixel areas defined by intersections of a plurality of gate lines and a plurality of data lines. Each of the plurality of pixels may include a TFT connected to the gate line and the data line, a pixel electrode connected to the TFT, and a common electrode formed adjacent to the pixel electrode and supplied with a common voltage.

[0187] The upper substrate 111 may further include a pad portion disposed at a first edge (or first non-display portion or first periphery) thereof and a gate driving circuit disposed at a second edge (or second non-display portion or second periphery).

[0188] The pad portion can supply externally supplied signals to the pixel array and the gate drive circuit. For example, the pad portion can include: a plurality of data pads connected to a plurality of data lines via a plurality of data link lines; and a plurality of gate input pads connected to the gate drive circuit via a gate control signal line. In an exemplary embodiment of the present disclosure, a first edge of the upper substrate 111 including the pad portion can protrude from a lateral surface corresponding to the first edge of the lower substrate 113, and the pad portion can be exposed in a direction toward the rear surface of the back cover 300. For example, the size of the upper substrate 111 can be larger than the size of the lower substrate 113, but embodiments of the present disclosure are not limited thereto.

[0189] The gate drive circuit according to the exemplary embodiment of the present disclosure may be embedded (or integrated) into the second edge (or second periphery) of the upper substrate 111 so as to be connected to a plurality of gate lines in a one-to-one relationship. For example, the gate drive circuit may be implemented with a shift register including transistors formed by the same process as the TFTs in the pixel region.

[0190] According to another exemplary embodiment of the present disclosure, the gate driving circuit may be implemented as an integrated circuit (IC) type without being embedded in the upper substrate 111 and may be included in the panel driving circuit.

[0191] The lower substrate 113 may be a second substrate or a color filter array substrate and may include a pixel defining pattern defining an opening area that overlaps each pixel area in the upper substrate 111, and a color filter layer formed in the opening area. The size of the lower substrate 113 according to an exemplary embodiment of the present disclosure may be smaller than the size of the upper substrate 111, but the embodiments of the present disclosure are not limited thereto. For example, the lower substrate 113 may overlap with the other portions of the upper substrate 111 except for the first edge. The lower substrate 113 may be bonded or attached to the other portions of the upper substrate 111 except for the first edge by a sealant, wherein the liquid crystal layer is located between the lower substrate 113 and the upper substrate 111.

[0192] The liquid crystal layer may be disposed between the upper substrate 111 and the lower substrate 113 and may include liquid crystals in which alignment directions of liquid crystal molecules are changed based on an electric field generated by a common voltage and a data voltage applied to a pixel electrode in each pixel.

[0193] The lower polarization member 115 may be attached to a lower surface of the lower substrate 113 and may polarize light incident from the backlight part 130 and traveling to the liquid crystal layer.

[0194] The upper polarization member 117 may be attached on an upper surface of the upper substrate 111 and may polarize light that passes through the upper substrate 111 and is released or radiated to the outside.

[0195] The display panel 110 according to an exemplary embodiment of the present disclosure may drive a liquid crystal layer based on an electric field generated in each pixel based on a common voltage and a data voltage applied thereto, and thus may display an image based on light passing through the liquid crystal layer.

[0196] In the display panel 110 according to an exemplary embodiment of the present disclosure, the upper substrate 111 including the TFT array substrate may configure an image display surface, and thus its entire front surface may be exposed to the outside without being partially covered by a separate mechanism or structure.

[0197] According to another exemplary embodiment of the present disclosure, in the display panel 110, the upper substrate 111 may be implemented as a color filter array substrate, and the lower substrate 113 may be implemented as a TFT array substrate. For example, the display panel 110 according to another exemplary embodiment of the present disclosure may have a structure in which the display panel 110 according to another exemplary embodiment of the present disclosure is turned upside down. In this case, the pad portion of the display panel 110 according to another exemplary embodiment of the present disclosure may be covered by a separate mechanism or a separate structure.

[0198] The apparatus 10 according to the exemplary embodiment of the present disclosure may further include a buffer member 150 .

[0199] The buffer member 150 may be formed to surround at least one of the lateral surfaces of the display panel 110. The buffer member 150 may be formed to cover each lateral surface and each corner of the display panel 110. The buffer member 150 may protect at least one of the lateral surfaces of the display panel 110 from external impact, or may prevent light from leaking through the lateral surface of the display panel 110. The buffer member 150 according to an exemplary embodiment of the present disclosure may include a silicone-based or ultraviolet (UV)-cured sealant (or resin). Considering the process tact time, the buffer member 150 may include a UV-cured sealant. In addition, the buffer member 150 according to an exemplary embodiment of the present disclosure may have a color, and for example, may be blue, red, cyan, or black, but the embodiments of the present disclosure are not limited thereto. For example, the buffer member 150 may include a colored resin or a light-shielding resin for preventing lateral light leakage.

[0200] A portion of the upper surface of the buffer member 150 according to the exemplary embodiment of the present disclosure may be covered by the upper polarizing member 117. In this case, the upper polarizing member 117 may include an extension portion that extends a length from a lateral surface corresponding to the outer surface of the upper substrate 111 to cover a portion of the front surface of the buffer member 150 and is attached to a portion of the front surface of the buffer member 150. The attachment surface between the buffer member 150 and the upper substrate 111 (or the boundary portion between the buffer member 150 and the upper substrate 111) may be hidden by the extension portion of the upper polarizing member 117, and thus, may not be exposed in the forward direction FD of the display device. When the buffer member 150 is not provided, the front surface of the display panel 110 may not be covered by a separate mechanism or a separate structure and may be exposed in the forward direction FD of the display device, and therefore, side light leakage of the display panel 110 may occur. Therefore, in a display device having a structure in which the entire front surface of the display panel 110 is exposed in the forward direction FD in order to eliminate or minimize the bezel width of the display device, the buffer member 150 may be configured to prevent lateral light leakage of the display panel 110 and protect the lateral surface of the display panel 110. However, embodiments of the present disclosure are not limited thereto, and the buffer member 150 may be omitted.

[0201] The backlight part 130 may be disposed at the rear surface of the display panel 110 and may irradiate light onto the rear surface of the display panel 110 .

[0202] The backlight part 130 according to an exemplary embodiment of the present disclosure may include a light guide plate 131 , a light source part, a reflective sheet 133 , and an optical sheet part 135 .

[0203] The light guide plate 131 may include a light input surface provided on the rear cover 300 so as to overlap with the display panel 110 and provided on at least one sidewall thereof. The light guide plate 131 may include a light-transmitting plastic or glass material, but embodiments of the present disclosure are not limited thereto. The light guide plate 131 may transmit (output) light incident from the light source portion through the light input surface to the display panel 110. For example, the light guide plate 131 may be referred to as a light guide member or a flat light source, but the term is not limited thereto.

[0204] The light source portion may irradiate light onto a light input surface provided in the light guide plate 131. The light source portion may be provided at the rear cover 300 to overlap with a first edge (or first periphery) of the display panel 110. The light source portion according to an exemplary embodiment of the present disclosure may include a plurality of light emitting diodes mounted on a light source printed circuit board (PCB) and irradiating light onto the light input surface of the light guide plate 131.

[0205] The reflective sheet 133 may be provided at the rear cover 300 (sometimes referred to as a support member) and configured to cover the rear surface of the light guide plate 131. The reflective sheet 133 may reflect light incident from the light guide plate 131 to the light guide plate 131 to minimize light loss.

[0206] The optical sheet portion 135 may be disposed on the front surface of the light guide plate 131 and may enhance the brightness characteristics of the light output from the light guide plate 131. The optical sheet portion 135 according to an exemplary embodiment of the present disclosure may include a lower diffuser sheet, a lower prism sheet, and an upper prism sheet. For example, the optical sheet portion 135 may be constructed as a single layer including the lower diffuser sheet, the lower prism sheet, and the upper prism sheet. However, embodiments of the present disclosure are not limited thereto, and the optical sheet portion 135 may be configured as a stacked combination of one or more of a diffuser sheet, a prism sheet, a dual brightness enhancement film, and a columnar sheet, or may be implemented as a composite sheet having both diffusion and light collection functions.

[0207] The guide member 200 may support the rear edge region (or rear peripheral region) of the display panel 110. The guide member 200 may be supported by the rear cover 300, accommodated in the rear cover 300, or incorporated into the rear cover 300 so as to overlap with the rear edge region of the display panel 110. The guide member 200 may be disposed below the rear edge region of the display panel 110 so as not to protrude outside each lateral surface of the display panel 110.

[0208] The guide member 200 according to an exemplary embodiment of the present disclosure may include a panel support portion 210 and a guide sidewall 230. For example, the guide member 200 may have a cross-sectional structure of ┓ or ┏ shape based on a coupling structure (or connection structure) of the panel support portion 210 and the guide sidewall 230.

[0209] The panel support portion 210 may be coupled or connected to the rear edge portion (or rear peripheral portion) of the display panel 110 and may be supported by the rear cover 300. For example, the panel support portion 210 may have a quadrilateral strip shape including an opening portion overlapping with the central portion of the display panel 110 excluding the rear edge portion, but the shape is not limited thereto. The size of the panel support portion 210 may be equal to or smaller than the size of the display panel 110 so as not to protrude outside each lateral surface of the display panel 110. For example, the size of the opening portion of the panel support portion 210 may be equal to or larger than the size of the pixel array (or display portion) provided in the display panel 110.

[0210] The panel supporting part 210 may directly contact the uppermost surface of the backlight part 130 (eg, the uppermost surface of the optical sheet part 135 ), or may be spaced apart from the uppermost surface of the optical sheet part 135 by a certain distance.

[0211] The guide sidewall 230 may be connected to the panel support portion 210 and may surround the lateral surface of the rear cover 300. For example, the guide sidewall 230 may be bent from the panel support portion 210 toward the lateral surface of the rear cover 300 and may surround the lateral surface of the rear cover 300 or may be surrounded by the lateral surface of the rear cover 300.

[0212] The guide member 200 according to an exemplary embodiment of the present disclosure may include a plastic material, a metal material, or a mixture of a plastic material and a metal material. For example, the guide member 200 may serve as a vibration transmitting member that transmits the sound vibration generated by the second vibration device 500 to the rear edge portion of the display panel 110. Therefore, the guide member 200 can transmit the sound vibration generated by the second vibration device 500 to the display panel 110 without loss while maintaining the rigidity of the display panel 110. For example, the guide member 200 may include a metal material for transmitting the sound vibration generated by the second vibration device 500 to the display panel 110 while maintaining the rigidity of the display panel 110, but the embodiments of the present disclosure are not limited thereto.

[0213] The guide member 200 according to the exemplary embodiment of the present disclosure may be coupled to the rear edge portion of the display panel 110 through the first coupling member 250 .

[0214] The first coupling member 250 (or panel coupling member or first connecting member) can be disposed between the rear edge portion of the display panel 110 and the panel support portion 210 of the guide member 200 and can place the display panel 110 at the guide member 200 or be coupled to the guide member 200. The first coupling member 250 may include an acrylic-based adhesive member or a polyurethane-based adhesive member, but embodiments of the present disclosure are not limited thereto. For example, the first coupling member 250 may include a polyurethane-based adhesive member that is relatively larger in adhesive force and hardness than an acrylic-based adhesive member, and the first coupling member 250 may therefore enhance the conductivity of the vibration of the guide member 200 to the display panel 110. In this one or more examples, the first coupling member 250 may include an acrylic-based adhesive layer, a double-sided foam adhesive pad, or an acrylic-based adhesive resin cured layer.

[0215] The front surface of the first coupling member 250 according to the exemplary embodiment of the present disclosure may be coupled or connected to the lower substrate 113 or the lower polarizing member 115 of the display panel 110. The first coupling member 250 may be directly coupled or connected to the rear edge portion of the lower substrate 113 in order to enhance adhesion between the first coupling member 250 and the display panel 110. In this case, the first coupling member 250 may be attached to the rear edge portion of the lower substrate 113 and may surround a lateral surface of the lower polarizing member 115, thereby preventing side light leakage from occurring in the lower polarizing member 115.

[0216] The first coupling member 250 may provide a sound transmission space STS between the display panel 110 and the guide member 200 to have a certain thickness (or height). The sound transmission space STS represents the gap between the backlight portion 130 and the display panel 110. The first coupling member 250 according to an exemplary embodiment may be provided in the panel support portion 210 of the guide member 200 in a four-sided closed shape or a closed loop shape. In this case, the first coupling member 250 may provide a closed sound transmission space STS between the rearmost surface of the display panel 110 and the uppermost surface of the backlight portion 130 facing each other, wherein the opening portion of the guide member 200 is located between the rearmost surface of the display panel 110 and the uppermost surface of the backlight portion 130, thereby preventing or minimizing the leakage (or loss) of the sound pressure transmitted to the sound transmission space STS. The sound transmission space STS may also serve as a sound generation space that generates sound pressure based on the vibration of the backlight portion 130 or a panel vibration space that enables the vibration of the display panel 110 to be smoothly performed.

[0217] The back cover 300 can support the guide member 200 and can cover the rear surface of the display member 100. In addition, the back cover 300 can support the first vibration device 400 and the second vibration device 500. The back cover 300 according to the exemplary embodiment of the present disclosure can serve as a vibration plate and can include a metal material or a metal alloy material, but the embodiments of the present disclosure are not limited thereto. For example, the back cover 300 can include at least one material among an aluminum (Al) material, a magnesium (Mg) material, a magnesium (Mg) alloy material, a magnesium-lithium (Mg-Li) alloy material, and an aluminum alloy material, but the embodiments of the present disclosure are not limited thereto.

[0218] The back cover 300 according to an exemplary embodiment of the present disclosure may include a back cover portion 310 supporting the rear surface of the display member 100 and a transverse cover portion 330 supporting the guide member 200 .

[0219] The rear cover portion 310 may be provided to cover the rear surface of the display member 100 and may support the display member 100. The rear cover portion 310 may be formed in a plate structure and may support the backlight portion 130 of the display member 100 and each of the first vibration device 400 and the second vibration device 500. For example, the rear cover portion 310 may directly contact the rear surface of the reflective sheet 133, and thus, sound vibrations generated by vibrations of each of the first vibration device 400 and the second vibration device 500 may be transmitted to the reflective sheet 133 of the backlight portion 130.

[0220] exist Figure 4 , the rear cover portion 310 is illustrated as being closely adhered to the backlight portion 130, but embodiments of the present disclosure are not limited thereto, and the rear cover portion 310 may be spaced apart from the backlight portion 130 by a certain space, and an air layer may be formed in the separation space or space. According to an exemplary embodiment of the present disclosure, the separation space or space between the rear cover portion 310 and the backlight portion 130 may be provided at a central portion of the display member 100.

[0221] According to an exemplary embodiment of the present disclosure, the back cover 300 may further include a first hole 313 and a second hole 315 .

[0222] The first hole 313 (or first through hole or first back cover hole) can be provided at the first rear area of ​​the back cover 300 overlapping with the first vibration device 400 and can be covered by the reflective sheet 133 of the backlight portion 130. For example, the first hole 313 can be provided at the middle area MA of the back cover portion 310. The first hole 313 can be formed to pass through the back cover portion 310 in the middle area MA of the back cover portion 310 in the thickness direction Z of the back cover portion 310. According to an exemplary embodiment of the present disclosure, the vibration device 400 can have a circular, elliptical, oval or quadrilateral shape, but embodiments of the present disclosure are not limited thereto.

[0223] The first hole 313 may provide a first gap space between the backlight portion 130 and the first vibration device 400. For example, the first gap space may be referred to as a vibration space based on driving of the first vibration device 400, a sound pressure level space (or a sound portion or a sound box or a resonator) that generates a sound pressure level based on vibration of the first vibration device 400, or a sound wave propagation path (or a sound energy incident portion or a sound wave transmission path) through which sound waves generated based on vibration of the first vibration device 400 directly propagate (or are transferred) to the display member 100, but embodiments of the present disclosure are not limited thereto.

[0224] According to an exemplary embodiment of the present disclosure, the size (or width) of the first hole 313 may be smaller than the size of the first vibration device 400. When the total size (or total width) of the first hole 313 is larger than the total size of the first vibration device 400, the first vibration device 400 can be inserted into (or passed through or accommodated in) the first hole 313. Therefore, the first vibration device 400 may not be disposed at the first hole 313 without a separate mechanism or separate structure. Therefore, when the total size of the first hole 313 is smaller than the total size of the first vibration device 400, the first vibration device 400 may be disposed in the first hole 313 without a separate mechanism or separate structure. For example, according to an exemplary embodiment of the present disclosure, the first hole 313 may have the same shape as that of the first vibration device 400 or may have a quadrilateral shape or a circular shape, but embodiments of the present disclosure are not limited thereto.

[0225] The second hole 315 (or second through hole or second back cover hole) can be provided at the second rear area of ​​the back cover 300 overlapping with the second vibration device 500 and can be covered by the reflective sheet 133 of the backlight portion 130. For example, the second hole 315 can be provided in the peripheral area (or edge area) EA of the back cover portion 310. The second hole 315 can be formed to pass through the back cover portion 310 in the peripheral area EA of the back cover portion 310 in the thickness direction Z of the back cover portion 310. According to an exemplary embodiment of the present disclosure, the second hole 315 can have a circular shape, an elliptical shape or an oval shape, a quadrilateral shape or a polygonal shape, but embodiments of the present disclosure are not limited thereto.

[0226] The second hole 315 may provide a second gap space between the backlight portion 130 and the second vibration device 500. For example, the second gap space may be referred to as a vibration space based on the driving of the second vibration device 500, a sound pressure level space (or a sound portion or a sound box or a resonator) that generates a sound pressure level based on the vibration of the second vibration device 500, or a sound wave propagation path (or a sound energy incident portion or a sound wave transmission path) through which sound waves generated based on the vibration of the second vibration device 500 are directly propagated or transmitted to the display member 100, but embodiments of the present disclosure are not limited thereto.

[0227] The size (or width) of the second hole 315 according to an exemplary embodiment of the present disclosure may be smaller than the size of the second vibration device 500. When the total size (or total width) of the second hole 315 is larger than the total size of the second vibration device 500, the second vibration device 500 can be inserted into (or passed through or accommodated in) the second hole 315. Therefore, the second vibration device 500 may not be disposed at the second hole 315 without a separate mechanism or separate structure. Therefore, when the total size of the second hole 315 is smaller than the total size of the first vibration device 400, the second vibration device 500 may be disposed in the second hole 315 without a separate mechanism or separate structure. For example, the second hole 315 according to an exemplary embodiment of the present disclosure may have the same shape as that of the second vibration device 500, or may have a quadrilateral shape, a circular shape, an elliptical shape, or a polygonal shape, but embodiments of the present disclosure are not limited thereto.

[0228] The lateral cover portion 330 may be bent from the edge or periphery of the rear cover portion 310 and may support the guide member 200. The lateral cover portion 330 may provide a backlight receiving space or receiving space in the rear cover portion 310 and may surround the lateral surface of the backlight portion 130 received in the backlight receiving space (or supported by the backlight receiving space). The lateral cover portion 330 may transmit the sound vibration generated by the second vibration device 500 in the rear cover portion 310 to the guide member 200.

[0229] The back cover 300 according to the exemplary embodiment of the present disclosure may further include a reinforcement portion 350. The reinforcement portion 350 may reinforce the rigidity of the back cover 300 and thus may be a rigidity reinforcement portion, but the embodiment of the present disclosure is not limited thereto.

[0230] The reinforcement portion 350 according to an exemplary embodiment of the present disclosure may be formed in an area (or connection area) where the rear cover portion 310 intersects the lateral cover portion 330. In an exemplary embodiment of the present disclosure, the reinforcement portion 350 may be formed along the peripheral area EA of the rear cover portion 310. For example, the reinforcement portion 350 may protrude in the rear surface direction to include an inclined surface inclined from the end of the rear cover portion 310. When the rear cover 300 includes the reinforcement portion 350, the lateral cover portion 330 may be connected to an end or a portion of the reinforcement portion 350.

[0231] The first vibration device 400 may be provided at the first rear area of ​​the rear cover 300 and may vibrate the first rear area of ​​the display member 100. For example, the first rear area of ​​the rear cover 300 may overlap with the middle area MA or the peripheral area EA of the display member 100, and the first area of ​​the display member 100 may be the middle area MA or the peripheral area EA.

[0232] When the vibration member is bisected in the longitudinal direction, the first rear region may be a region overlapping the central portion except for the periphery or edge of the bisected rear cover 300. In this example, the periphery or edge may include the peripheral region EA, and the central portion may include the central region CA and the middle region MA.

[0233] The first rear region may be provided on the upper end side or upper portion of the central portion. In this example, the upper end side may be the upper portion when the vibration member is vertically divided into two equal parts.

[0234] The first rear region may be disposed at a periphery of the central portion, and the periphery may be a side or portion adjacent to a short side edge (or a short side periphery) of the vibration member.

[0235] The first vibration device 400 according to an exemplary embodiment of the present disclosure may be provided at the middle area MA of the back cover 300 and may vibrate the middle area MA of the display member 100. The first vibration device 400 may generate a sound pressure level between the display member 100 and the back cover 300 at the middle area MA of the display member 100. The first vibration device 400 may generate a sound pressure level between the display member 100 and the back cover 300 and may vibrate the middle area MA of the display member 100 based on the sound pressure level to generate a first sound S1 of a first tone vocal range at the middle area MA of the display member 100. The first sound S1 of the first tone vocal range according to an exemplary embodiment of the present disclosure may have a frequency of a low-pitched vocal range. For example, the low-pitched vocal range may be 200 Hz or less, but embodiments of the present disclosure are not limited thereto and may be, for example, 3 kHz or less.

[0236] The first vibration device 400 according to an exemplary embodiment of the present disclosure may be coupled to the middle area MA of the back cover portion 310 of the back cover 300 or disposed at the middle area MA of the back cover portion 310 of the back cover 300. For example, the first vibration device 400 may be coupled to the middle area MA of the back cover portion 310 or disposed at the middle area MA of the back cover portion 310. Therefore, in response to a sound signal (or voice signal) input from the outside, the first vibration device 400 may vibrate the middle area MA of the back cover portion 310 to generate a sound pressure level and, based on the sound pressure level, may vibrate the middle area MA of the display member 100 to generate a first sound S1. The first vibration device 400 according to an exemplary embodiment of the present disclosure may include a sound actuator or a sound exciter, but the embodiments of the present disclosure are not limited thereto and may be implemented as a sound generating device using, for example, a coil (or voice coil) and a magnet.

[0237] The first vibration device 400 according to an exemplary embodiment of the present disclosure may include a first sound generating device 410 and a second sound generating device 430 .

[0238] The first sound generating device 410 can vibrate the first middle area MA1 of the middle area MA of the display member 100 to output the first sound S1 of the first tone sound band in the forward direction FD of the display panel 110. The first sound generating device 410 can be disposed at the first middle area MA1 of the middle area MA of the rear cover portion 310. For example, the first sound generating device 410 can be disposed at the rear cover portion 310 or coupled to the rear cover portion 310 to cover the first hole 313 in the first middle area MA1 of the rear cover portion 310.

[0239] In response to the sound signal, the first sound generating device 410 according to an exemplary embodiment of the present disclosure can vibrate the first middle area MA1 of the rear cover portion 310 to generate a sound pressure level inside the first hole 313 (or the first gap space), and thus, can vibrate the first middle area MA1 of the display member 100 to generate a first sound S1 of a first tone sound band. For example, when the first sound generating device 410 vibrates based on the sound signal, a sound pressure level can be generated in the first hole 313 based on the vibration of the first middle area MA1 of the rear cover portion 310 based on the vibration of the first sound generating device 410, a sound pressure level can be generated in the sound transmission space STS based on the vibration of the backlight portion 130 based on the sound pressure level in the first hole 313, and the first sound S1 of the first tone sound band generated based on the vibration of the first middle area MA1 of the display panel 110 based on the sound pressure level generated in the sound transmission space STS can be output in the forward direction FD of the display panel 110. Therefore, the sound wave generated based on the vibration of the first sound generating device 410 may be directly transferred (or propagated) to the display member 100 through the first hole 313 , and thus the sound pressure level characteristics and sound quality of the first sound S1 may be enhanced.

[0240] The second sound generating device 430 can vibrate the second middle area MA2 of the middle area MA of the display member 100 to output the first sound S1 of the first tone sound band in the forward direction of the display panel 110. The second sound generating device 430 can be disposed at the second middle area MA2 of the middle area MA of the rear cover portion 310. For example, the second sound generating device 430 can be disposed at the rear cover portion 310 or coupled to the rear cover portion 310 to cover the first hole 313 formed in the second middle area MA2 of the rear cover portion 310.

[0241] In response to the sound signal, the second sound generating device 430 according to the exemplary embodiment of the present disclosure can vibrate the second middle area MA2 of the rear cover portion 310 to generate a sound pressure level inside the first hole 313 (or the first gap space), and thus, the second middle area MA2 of the display member 100 can be vibrated to generate the first sound S1 of the first tone sound band. For example, when the second sound generating device 430 vibrates based on the sound signal, a sound pressure level can be generated in the first hole 313 based on the vibration of the second middle area MA2 of the rear cover portion 310 based on the vibration of the second sound generating device 430, and a sound pressure level can be generated in the sound transmission space STS based on the vibration of the backlight portion 130 based on the sound pressure level in the first hole 313, and the first sound S1 of the first tone sound band generated based on the vibration of the second middle area MA2 of the display panel 110 based on the sound pressure level generated in the sound transmission space STS can be output in the forward direction FD of the display panel 110. Therefore, the sound wave generated based on the vibration of the second sound generating device 430 may be directly transferred (or propagated) to the display member 100 through the first hole 313 , and thus the sound pressure level characteristics and sound quality of the first sound S1 may be enhanced.

[0242] The positions of the first and second sound generating devices 410 and 430 according to an exemplary embodiment of the present disclosure may be adjusted based on the implementation of a sound including stereo sound or harmony sound based on the vibration of the first and second sound generating devices 410 and 430. For example, the arrangement position of each of the first and second sound generating devices 410 and 430 may be set to have a symmetrical structure or asymmetrical structure with respect to the first direction X (or width direction) of the display member 100 and the center line CL of the display member 100.

[0243] The second vibration device 500 may be provided at the second rear area of ​​the rear cover 300 and may vibrate the second rear area of ​​the display member 100. For example, the second rear area of ​​the rear cover 300 may be a portion other than the first rear area of ​​the peripheral area EA and the middle area MA of the display member 100, and the second rear area of ​​the display member 100 may be a portion other than the first area of ​​the peripheral area EA and the middle area MA.

[0244] When the vibration member is bisected in the longitudinal direction, the second rear region may be an area overlapping the periphery and outermost corner of the bisected vibration member. The first rear region and the second rear region may be areas that do not overlap with each other. In this example, the periphery may be an area including the peripheral area EA, and the area overlapping the outermost corner may be an area including the corner area CP.

[0245] The second vibration device 500 according to an exemplary embodiment of the present disclosure may be provided at the first rear area of ​​the rear cover 300 and may vibrate the middle area MA or the peripheral area EA of the display member 100. The second vibration device 500 may generate sound vibrations in the middle area MA or the peripheral area EA of the display member 100. The second vibration device 500 may generate a second sound S2 of a second tone sound band in the peripheral area EA of the display member 100, which is different from the first sound S1 of the first tone sound band generated in the middle area MA and the peripheral area EA of the display member 100.

[0246] In addition, the second vibration device 500 according to the exemplary embodiment of the present disclosure may be provided at the first rear area of ​​the rear cover 300 and may vibrate the peripheral area EA of the display member 100. The second vibration device 500 may generate sound vibrations in the peripheral area EA of the display member 100. The second vibration device 500 may generate a second sound S2 of a second tone sound band in the peripheral area EA of the display member 100, which is different from the first sound S1 of the first tone sound band generated in the middle area MA and the peripheral area EA of the display member 100.

[0247] The second sound S2 of the second pitch vocal range according to an exemplary embodiment of the present disclosure may have a frequency of a mid-high pitch vocal range or a high pitch vocal range. For example, the mid-pitched vocal range may be 200 Hz to 3 kHz, but the embodiments of the present disclosure are not limited thereto and may be, for example, 3 kHz to 5 kHz. The high-pitched vocal range may be 3 kHz or higher, but the embodiments of the present disclosure are not limited thereto and may be, for example, 5 kHz or higher.

[0248] The second vibration device 500 according to the exemplary embodiment of the present disclosure can be connected to the peripheral area EA of the back cover portion 310 of the back cover 300 or be provided at the peripheral area EA of the back cover portion 310 of the back cover 300. For example, the second vibration device 500 can be connected to the peripheral area EA of the back cover portion 310 or be provided at the peripheral area EA of the back cover portion 310. Therefore, in response to a sound signal (or voice signal) input from the outside, the second vibration device 500 can vibrate the peripheral area EA of the back cover portion 310 to generate sound vibration and can vibrate the peripheral area of ​​the display member 100 based on the sound vibration of the second vibration device 500 to generate the second sound S2 of the second tone sound band. The second vibration device 500 according to the exemplary embodiment of the present disclosure can be configured to vibrate through the piezoelectric effect. The second vibration device 500 according to the exemplary embodiment of the present disclosure may include a piezoelectric material or a piezoelectric device having a piezoelectric effect (or inverse piezoelectric characteristics). For example, the piezoelectric device may be a piezoelectric material layer, a piezoelectric vibration component, a piezoelectric driving component, a piezoelectric vibration layer, a piezoelectric structure, etc., but the embodiments of the present disclosure are not limited thereto.

[0249] The second vibration device 500 according to an exemplary embodiment of the present disclosure may include a first piezoelectric vibration device 510 and a second piezoelectric vibration device 530 .

[0250] The first piezoelectric vibration device 510 can vibrate the first peripheral area EA1 (or the first edge area or the left edge area) of the peripheral area EA of the display member 100 to output the second sound S2 of the second tone sound band in the forward direction of the display panel 110. The first piezoelectric vibration device 510 can be provided at the first peripheral area (or the left edge area or the left peripheral area) EA1 among the peripheral area EA of the rear cover portion 310. For example, the first piezoelectric vibration device 510 can be provided at the rear cover portion 310 or coupled to the rear cover portion 310 to cover the second hole 315 in the first peripheral area EA1 of the rear cover portion 310.

[0251] In response to the sound signal, the first piezoelectric vibration device 510 according to the exemplary embodiment of the present disclosure can vibrate the first peripheral area EA1 of the rear cover portion 310 to vibrate the first peripheral area EA1 of the display panel 110, thereby generating the second sound S2 of the second tone sound band in the first peripheral area EA1 of the display panel 110. For example, when the first piezoelectric vibration device 510 vibrates based on the sound signal, the sound vibration generated in the first peripheral area EA1 of the rear cover portion 310 based on the vibration of the first piezoelectric vibration device 510 can be transmitted to the first peripheral area EA1 of the display panel 110 through the guide member 200 and the lateral cover portion 330 of the rear cover 300, and the second sound S2 of the second tone sound band generated based on the vibration of the first peripheral area EA1 of the display panel 110 based on the sound vibration transmitted through the guide member 200 can be output in the forward direction of the display panel 110. Therefore, the sound waves generated by the vibration of the first piezoelectric vibration device 510 can be directly transmitted (or propagated) to the first peripheral area EA1 of the display member 100 through the second hole 315, thereby enhancing the sound pressure level characteristics and sound quality of the second sound S2. In addition, the vibration of the first peripheral area EA1 of the rear cover portion 310 based on the vibration of the first piezoelectric vibration device 510 can be reduced, thereby further enhancing the sound pressure level characteristics and sound quality of the second sound S2.

[0252] The first piezoelectric vibration device 510 according to an exemplary embodiment of the present disclosure may be disposed adjacent to the lateral cover portion 330 of the rear cover 300 so that a high-level second sound S2 generated based on the sound vibration of the first peripheral area EA1 of the display panel 110 corresponding to the sound vibration of the first peripheral area EA1 of the rear cover portion 310 is directly transmitted to a listener or user. For example, the first piezoelectric vibration device 510 may be disposed at the first peripheral area EA1 of the rear cover portion 310 so as to overlap with the panel support portion 210 of the guide member 200 configured to support the first peripheral area EA1 of the display panel 110.

[0253] The first piezoelectric vibration device 510 according to an exemplary embodiment of the present disclosure can be arranged at the horizontal area HA or the corner area CP of the rear cover portion 310 relative to the longitudinal direction (or vertical direction) of the rear cover portion 310 parallel to the second direction Y. For example, the first sound generating device 410 of the first vibration device 400 according to an exemplary embodiment of the present disclosure can be arranged on the same line as the first piezoelectric vibration device 510, or can be arranged on or below a horizontal line (or a central horizontal line) parallel to the first direction X relative to the first direction X. In an exemplary embodiment of the present disclosure, the central portion of the first sound generating device 410 can be arranged on a horizontal line (or a central horizontal line) extending from the central portion of the first piezoelectric vibration device 510 parallel to the first direction X. In another exemplary embodiment of the present disclosure, the central portion of the first sound generating device 410 can be arranged on the horizontal area HA relative to the second direction Y. The central portion of the first sound generating device 410 can be set below or above the horizontal line (or central horizontal line) relative to the second direction Y instead of on the horizontal line (or central horizontal line), so that the first sound S1 of the low-pitched sound generated based on the vibration of the first middle area MA1 of the middle area MA of the display member 100 is directly transmitted to the listener or user.

[0254] like Figure 5B As illustrated in FIG. 5 , for example, the first piezoelectric vibration device 510 according to an exemplary embodiment of the present disclosure may include a first piezoelectric device 511 attached to a plate 501 through a first adhesive member 512 .

[0255] The first piezoelectric device 511 may include a piezoelectric material layer having a piezoelectric effect.

[0256] The piezoelectric material layer may include a piezoelectric material that vibrates based on an electric field. In this example, the piezoelectric material may have such characteristics that, when pressure or distortion is applied to the crystal structure by an external force, a potential difference is generated due to dielectric polarization caused by a change in the relative positions of positive (+) ions (or cations) and negative (-) ions (or anions), and vibration is generated by an electric field based on a voltage applied thereto.

[0257] The piezoelectric material layer according to an exemplary embodiment of the present disclosure may include a polymer piezoelectric material, a thin film piezoelectric material, a composite piezoelectric material, a single crystal ceramic piezoelectric material or a polycrystalline piezoelectric material. The polymer piezoelectric material according to an exemplary embodiment of the present disclosure may include polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFe)) or poly(vinylidene fluoride-tetrafluoroethylene) (P(VDF-TeFE)). The thin film piezoelectric material according to an exemplary embodiment of the present disclosure may include ZnO, CdS or AlN. The composite piezoelectric material according to an exemplary embodiment of the present disclosure may include lead zirconate titanate (PZT)-PVDF, PZT-silicone rubber, PZT-epoxy resin, PZT-foam polymer or PZT-foam polyurethane. The single crystal ceramic piezoelectric material according to the exemplary embodiment of the present disclosure may include aluminum phosphate (e.g., monophosphate and α-AlPO 4 ), silicon dioxide (e.g., α-SiO 2 ), lithium niobate (LiNbO 3 ), terbium molybdate (Tb 2 (MoO 4 ) 3 ), lithium tetraborate (Li 2 B 4 O 7 ), or ZnO. The polycrystalline ceramic piezoelectric material according to the exemplary embodiment of the present disclosure may include a PZT-based material, a PT-based material, a PZT complex perovskite-based material, or barium titanate (BaTiO 3 ).

[0258] The first piezoelectric device 511 according to an exemplary embodiment of the present disclosure may have a first length parallel to the first direction X and a second length parallel to the second direction Y. For example, the first length of the first piezoelectric device 511 may be smaller than the second length, but embodiments of the present disclosure are not limited thereto and may be longer than or equal to the second length.

[0259] For example, Figure 5B As shown, the first adhesive member 512 may include a double-sided tape or a natural curable adhesive, but the embodiments of the present disclosure are not limited thereto. For example, the first adhesive member 512 may include a heat-curable adhesive or a UV-curable adhesive, but in this case, the characteristics of the first piezoelectric device 511 may be degraded due to the heat generated during the curing process of the first adhesive member 512.

[0260] For example, Figures 6A to 6H 、 Figure 8 and Figure 14 As illustrated in FIG, the first piezoelectric vibration device 510 according to an exemplary embodiment of the present disclosure may further include a first protective member 513 attached to the front surface of the first piezoelectric device 511 and a second protective member 515 attached to the rear surface of the first piezoelectric device 511. The first protective member 513 and the second protective member 515 may sometimes be referred to as a first cover member 513 and a second cover member 515, respectively.

[0261] The first and second protective members 513 and 515 can be sized to be wider than the first piezoelectric device 511 and can be attached to the front and rear surfaces of the first piezoelectric device 511. The first and second protective members 513 and 515 can protect the first piezoelectric device 511 from damage by physical shock and / or electrical shock, such as static electricity. For example, the first piezoelectric device 511 can be damaged by static electricity generated in the display member 100, such as the panel driver circuit portion, or flowing in from the outside, and can also be damaged by physical contact with the display member 100 caused by pressure from the display member 100. Therefore, the first protective member 513 can be provided on the front surface of the first piezoelectric device 511, while the second protective member 515 can be provided on the rear surface of the first piezoelectric device 511. Thus, static electricity transmitted through the display member 100 to the first piezoelectric device 511 can be blocked or prevented, thereby protecting the first piezoelectric device 511 and protecting the first piezoelectric device 511 from physical shock from the display member 100. The first and second protective members 513 and 515 according to an exemplary embodiment of the present disclosure may include single-sided insulating tape, double-sided insulating tape, single-sided insulating foam tape, or double-sided insulating foam tape having adhesive layers attached to the front or rear surfaces of the first piezoelectric device 511. The first and second protective members 513 and 515 may include polyethylene terephthalate (PET) or polyvinyl chloride (PVC).

[0262] The second piezoelectric vibration device 530 can vibrate the second peripheral area EA2 (or the right edge area or the right peripheral area) of the peripheral area EA of the display member 100 to output the second sound S2 of the second tone sound band in the forward direction FD of the display panel 110. The second piezoelectric vibration device 530 can be provided in the second peripheral area (or the right edge area or the right peripheral area) EA2 in the peripheral area EA of the rear cover portion 310. For example, the second piezoelectric vibration device 530 can be provided in the rear cover portion 310 or coupled or connected to the rear cover portion 310 to cover the second hole 315 in the second peripheral area EA2 of the rear cover portion 310.

[0263] In response to the sound signal, the second piezoelectric vibration device 530 according to the exemplary embodiment of the present disclosure can vibrate the second peripheral area EA2 of the rear cover portion 310 to vibrate the second peripheral area EA2 of the display panel 110, thereby generating the second sound S2 of the second tone sound band in the second peripheral area EA2 of the display panel 110. For example, when the second piezoelectric vibration device 530 vibrates based on the sound signal, the sound vibration generated in the second peripheral area EA2 of the rear cover portion 310 based on the vibration of the second piezoelectric vibration device 530 can be transmitted to the second peripheral area EA2 of the display panel 110 through the guide member 200 and the lateral cover portion 330 of the rear cover 300, and the second sound S2 of the second tone sound band generated based on the vibration of the second peripheral area EA2 of the display panel 110 based on the sound vibration transmitted through the guide member 200 can be output in the forward direction of the display panel 110. Therefore, the sound waves generated by the vibration of the second piezoelectric vibration device 530 can be directly transmitted (or propagated) to the second peripheral area EA2 of the display member 100 through the second hole 315, thereby enhancing the sound pressure level characteristics and sound quality of the second sound S2. In addition, the vibration of the second peripheral area EA2 of the rear cover portion 310 based on the vibration of the first piezoelectric vibration device 510 can be reduced, thereby further enhancing the sound pressure level characteristics and sound quality of the second sound S2.

[0264] The second piezoelectric vibration device 530 according to an exemplary embodiment of the present disclosure may be disposed in the second peripheral area EA2 of the back cover portion 310 or may be disposed at a different position to be symmetrical with the first piezoelectric vibration device 510 with respect to the center line CL of the display member 100 .

[0265] The positions of the first and second piezoelectric vibration devices 510 and 530 according to the exemplary embodiment of the present disclosure may be adjusted based on an implementation method including a stereo sound or a harmonious sound having sounds based on the vibrations of the first and second piezoelectric vibration devices 510 and 530. For example, the arrangement position of each of the first and second piezoelectric vibration devices 510 and 530 may be set to have a symmetrical structure with respect to the first direction X (or width direction) of the display member 100 or to be asymmetrical with respect to the center line CL of the display member 100.

[0266] For example, Figure 5B As illustrated, the second piezoelectric vibration device 530 according to an exemplary embodiment of the present disclosure may include a second piezoelectric device attached to the plate 501 through a first adhesive member 512 .

[0267] The second piezoelectric device may include a piezoelectric material layer having a piezoelectric effect. The second piezoelectric device may have a configuration (or structure) substantially the same as that of the first piezoelectric device 511 of the first piezoelectric vibration device 510, and therefore, a repeated description thereof may be omitted for simplicity.

[0268] The first adhesive member 512 may include a double-sided tape or a natural curable adhesive, but the embodiments of the present disclosure are not limited thereto. For example, the first adhesive member 512 may include a heat-curable adhesive or a UV-curable adhesive, but in this case, the characteristics of the second piezoelectric device may be degraded by the heat generated during the curing process of the first adhesive member 512.

[0269] The second piezoelectric vibration device 530 according to an exemplary embodiment of the present disclosure may further include a first protective member 513 attached to a front surface of the second piezoelectric device and a second protective member 515 attached to a rear surface of the second piezoelectric device.

[0270] The first and second protective members 513, 515 may be sized to be wider than the second piezoelectric device and may be attached to the rear surface of the second piezoelectric device. The first and second protective members 513, 515 may prevent the second piezoelectric device from being damaged by physical impact and / or electrical shock, such as static electricity. The first and second protective members 513, 515 may have substantially the same configuration (or structure) as the first and second protective members 513, 515 of the first piezoelectric device 511, and therefore, a repeated description thereof may be omitted for the sake of brevity.

[0271] The device according to the exemplary embodiment of the present disclosure may further include a system back cover 600 provided on the rear surface of the back cover 300 .

[0272] The system back cover 600 may house the display member 100 coupled or connected to each of the first vibration device 400 and the second vibration device 500 and may surround a lateral surface of the display member 100. For example, the system back cover 600 may be referred to as a set cover, a rear set cover, a top set cover, a product cover, or a top product cover, but the term is not limited thereto.

[0273] The system back cover 600 according to an exemplary embodiment of the present disclosure may include a rear structure 610 and a lateral structure 630 .

[0274] The rear structure 610 may be an outermost rear mechanism (or outermost rear structure) provided at the rear surface of the device, and the rear structure 610 may support (or accommodate) the display member 100 and may cover the rear surface of the display member 100 .

[0275] The lateral structure 630 may be the outermost lateral mechanism (or outermost lateral structure) provided at the lateral surface of the device. The lateral structure 630 may be connected to an edge or periphery of the rear structure 610 and may cover the lateral surface of the display member 100.

[0276] Figure 2C An example in which the device according to the exemplary embodiment of the present disclosure is divided into a left area, a right area, and first to sixteenth areas 1 16 is illustrated.

[0277] refer to Figure 2C , the device according to the exemplary embodiment of the present disclosure may be laterally symmetrical with respect to the center line CL and may be divided into a left area LA and a right area RA. The left area LA may be divided into a first area 1 to a sixteenth area 16 in a matrix order from the upper left end to the lower right end to have the same sixteen areas, and the right area RA may be divided into a first area 1 to a sixteenth area 16 in a matrix order from the upper right end to the lower left end.

[0278] The device according to an exemplary embodiment of the present disclosure may include a central area CA, a middle area MA including a first middle area MA1 and a second middle area MA2, and a peripheral area EA including a first peripheral area EA1 and a second peripheral area EA2 in a first direction X. The central area CA may include a fourth area 4, an eighth area 8, a twelfth area 12, and a sixteenth area 16. The middle area MA may include a second area 2, a third area 3, a sixth area 6, a seventh area 7, a tenth area 10, an eleventh area 11, a fourteenth area 14, and a fifteenth area 15. The peripheral area EA may include a first area 1, a fifth area 5, a ninth area 9, and a thirteenth area 13.

[0279] According to an exemplary embodiment of the present disclosure, a device may include a central area located in the center of the back cover, a peripheral area located at the periphery of the back cover, and an intermediate area located between the central area and the peripheral area. For example, the central area may include the eighth area 8 and the twelfth area 12; the peripheral area may include the first area 1, the second area 2, the third area 3, the fourth area 4, the fifth area 5, the ninth area 9, the tenth area 10, the thirteenth area 13, the fourteenth area 14, the fifteenth area 15, and the sixteenth area 16; and the intermediate area may include the second area 2, the third area 3, the sixth area 6, the seventh area 7, the tenth area 10, and the eleventh area 11. In some embodiments, the first vibration device may be provided in one or more areas of the first to sixteenth areas near the center of the back cover. The second vibration device may be provided in one or more areas of the first to sixteenth areas near the outside of the back cover.

[0280] In addition, the device according to the exemplary embodiment of the present disclosure may include a horizontal area HA and a corner area CP including a first corner area CP1 and a second corner area CP2 in the second direction Y. The horizontal area HA may include the fifth to eighth areas and the ninth to twelfth areas. The first corner area CP1 may include the first to fourth areas, and the second corner area CP2 may include the thirteenth to sixteenth areas.

[0281] According to an exemplary embodiment of the present disclosure, the first vibration device 400 may include a first sound generating device 410 and a second sound generating device 430, and may be provided at, for example, the sixth, seventh, tenth, and eleventh regions of the rear cover 300. The horizontal region HA is located between the first corner region CP1 and the second corner region CP2 in the Y direction, as shown in FIG. Figure 2C So the horizontal area HA is the part of the device extending from the left to the right in the middle.

[0282] According to an exemplary embodiment of the present disclosure, the second vibration device 500 may include a first sound piezoelectric vibration device 510 and a second sound piezoelectric vibration device 530 , and may be disposed at, for example, the first, fifth, ninth, and thirteenth regions of the back cover 300 .

[0283] According to an exemplary embodiment of the present disclosure, in the second vibration device 500, when half of the rear surface (half side) of the support member (or device or back cover 300) is divided into, for example, 16 equal parts (or 4×4), the second vibration device 500 can be provided in at least one or more of the first area 1 and the thirteenth area 13 within the first area 1 to the sixteenth area 16, and the second vibration device 500 can be provided on one side or portion adjacent to the corner periphery (or corner) of the support member. In this example, the corner periphery may include the corner area CP.

[0284] When the second vibration device 500 is provided at the periphery of the back cover 300, the periphery of the back cover 300 can be fixed (or utilized) as a transmission path for the high-pitched sound (or high-frequency sound wave HSW) generated by the second vibration device 500, and the high-pitched sound generated by the second vibration device 500 can be radiated, thereby improving the high-pitched sound characteristics of the device. In this example, the periphery can include the peripheral area EA.

[0285] According to an exemplary embodiment of the present disclosure, the second vibration device 500 can be configured to vibrate a corner of the display module (or vibration member). For example, when half of the rear surface of the support member (or device) is divided into 16 equal parts, the second vibration device 500 is provided in at least one or more of the first area 1 and the thirteenth area 13 among the first to sixteenth areas 1-16.

[0286] According to an exemplary embodiment of the present disclosure, the first vibration device 400 may be provided in any one of the sixth region 6 and the tenth region 10 among the first to sixteenth regions 1-16. Alternatively, the first vibration device 400 may be provided in any one of the seventh region 7 and the eleventh region 11 among the first to sixteenth regions 1-16.

[0287] According to an exemplary embodiment of the present disclosure, when the rear surface of the support member (or device) is divided into two in the longitudinal direction (X direction), the first rear area may be an area overlapping with the central portion excluding the periphery of the bisected support member (or vibrating member). In this example, the central portion may include a central area CA and an intermediate area MA.

[0288] According to an exemplary embodiment of the present disclosure, the first rear region may be provided at an upper end side (or upper portion) of the central portion.

[0289] According to an exemplary embodiment of the present disclosure, the first rear region may be provided at the periphery of the central portion, and the periphery may be a side adjacent to a short side of the support member (or the vibration member).

[0290] According to an exemplary embodiment of the present disclosure, the first vibration device 400 may be disposed in an area or portion that does not overlap with the horizontal and diagonal directions of the vibration plate or vibration member relative to the horizontal and diagonal directions of the vibration plate or vibration member. In one or more examples, the first vibration device 400 may be disposed in an area or portion that does not overlap with the vertical and diagonal directions of the vibration plate or vibration member relative to the vertical and diagonal directions of the vibration plate or vibration member. In this example, the horizontal direction may be a line intersecting the central portion of the horizontal area HA, the vertical direction may be a center line CL, and the diagonal direction may be one of the lines connecting two diagonally facing vertices.

[0291] According to an exemplary embodiment of the present disclosure, the first vibration device 400 may be positioned in an area or portion that does not overlap with the horizontal, vertical, and diagonal directions of a vibration plate (e.g., a display module) or a vibration member. For example, the first vibration device 400 may not be positioned in the same row or column as the second vibration device 500. For example, the first vibration device 400 may not be positioned in the same horizontal or vertical direction as the second vibration device 500. For example, the first vibration device 400 may be positioned in an oblique or diagonal direction relative to the second vibration device 500. For example, the first vibration device 400 may be positioned in the same line as the second vibration device 500 in an oblique or diagonal direction.

[0292] For example, the central portion of the first vibration device 400 and the central portion of the second vibration device 500 may be arranged at an oblique line or diagonal line between a horizontal line in the horizontal direction and a vertical line in the vertical direction. In this example, the same row and the same column may be the same row or the same column in the first direction or the second direction in the vibration member including the first to sixteenth regions.

[0293] According to an exemplary embodiment of the present disclosure, the second vibration device 500 can be set at a position where the deviation of the curvature of the support member (e.g., the bottom of the cover) is small. For example, the deviation of the curvature of the area in the peripheral area EA that overlaps with the corner area CP can be smaller than the deviation of the curvature of the area in the peripheral area EA that does not overlap with the corner area CP. For example, the area in the peripheral area EA that overlaps with the corner area CP can include the first area 1 or the thirteenth area 13, and the non-overlapping area in the peripheral area EA with the corner area (CP) can include the fifth area 5 or the ninth area 9. Therefore, the second vibration device 500 can be set in the first area 1 or the thirteenth area 13.

[0294] Figure 5A Illustrated Figure 3 Example of region B, Figure 5B Illustrated Figure 3 Another example of region B. Figure 5A and Figure 5B yes Figure 3 FIGURE 1 illustrates an example of an enlarged view of region B. Figure 3 One or more examples of the structure of the first vibration device and the second vibration device in the illustrated device. In the following description, therefore, only each of the first vibration device and the second vibration device will be described in detail, and the other elements are described in detail. Figure 3 The same reference numerals are designated, and their repeated descriptions will be omitted or given briefly.

[0295] Reference Figure 5A , the apparatus according to the exemplary embodiment may include a first sound generating device 410 and a second sound generating device 430 provided at the back cover 300 .

[0296] The device according to the exemplary embodiment may include a vibration plate and a first vibration device 400 located on the rear surface of the vibration plate. The first vibration device 400 according to the exemplary embodiment of the present disclosure may include a first sound generating device 410 and a second sound generating device 430. For example, the first vibration device 400 may be a coil-type vibration device.

[0297] Each of the first sound generating device 410 and the second sound generating device 430 may be supported by the rear cover portion 310 of the rear cover 300 to cover the first hole 313 in the rear cover portion 310. Each of the first sound generating device 410 and the second sound generating device 430 may vibrate based on the sound signal to vibrate the middle area MA of the display member 100, thereby generating the first sound S1 in the middle area MA of the display member 100. For example, each of the first sound generating device 410 and the second sound generating device 430 may vibrate based on the sound signal to generate a sound wave, which may pass through the first hole 313 and may be transmitted (or propagated) to the display member 100, and the middle area MA of the display member 100 may vibrate based on the sound wave transmitted through the first hole 313, thereby outputting the first sound S1 in the forward direction FD of the display member 100 at the middle area of ​​the display member 100.

[0298] According to an exemplary embodiment of the present disclosure, the first hole 313 can serve as a sound wave propagation path (or sound energy incident portion) through which the sound waves (or sounds) generated based on the vibration of each of the first sound generating device 410 and the second sound generating device 430 are directly propagated (or incident) toward the rear surface of the display member 100.

[0299] According to an exemplary embodiment of the present disclosure, each of the first sound generating device 410 and the second sound generating device 430 may not vibrate the rear cover portion 310 and may vibrate independently, and therefore, the middle area MA may be directly vibrated without using the rear cover portion 310 as a vibration plate and the vibration of the rear cover portion 310 may be minimized to generate a stable sound pressure level, thereby minimizing the occurrence of noise caused by the vibration of the rear cover portion 310.

[0300] Each of the first sound generating device 410 and the second sound generating device 430 according to an exemplary embodiment of the present disclosure may include a module frame 401, a bobbin 402, a magnetic member 403, a coil 404, a central magnetic pole 405, and a damper 406. For example, in each of the first sound generating device 410 and the second sound generating device 430, the module frame 401 may be referred to as a fixing portion fixed to the rear cover 300. For example, in each of the first sound generating device 410 and the second sound generating device 430, the bobbin 402, the magnetic member 403, the coil 404, the central magnetic pole 405, and the damper 406 may be referred to as a vibration portion configured to vibrate the display member 100, but the term is not limited thereto.

[0301] The module frame 401 may be supported by the rear cover portion 310. The module frame 401 according to an exemplary embodiment of the present disclosure may include a frame body 401a, an upper plate 401b, and a fixing bracket 401c. According to an exemplary embodiment of the present disclosure, the first vibration device 400 may have a quadrilateral, an elliptical, or a circular shape, but the embodiments of the present disclosure are not limited thereto. According to an exemplary embodiment of the present disclosure, the module frame 401 may have a quadrilateral, an elliptical, or a circular shape, but the embodiments of the present disclosure are not limited thereto.

[0302] The frame body 401a may be fixed to the rear cover portion 310. The frame body 401a may perform a function of supporting a lower plate of the magnetic member 403.

[0303] The upper plate 401b can be arranged at the front edge or front periphery of the frame body 401a to have a cylindrical shape including a hollow portion. The hollow portion of the upper plate 401b can have a cylindrical structure, but the embodiments of the present disclosure are not limited thereto. For example, the hollow portion of the upper plate 401b can have a circular or oval shape. The frame body 401a and the upper plate 401b can be implemented as a whole having a U-shape. For example, the frame body 401a and the upper plate 401b are not limited to these terms and can be referred to as other terms such as a yoke. The frame body 401a and the upper plate 401b can have a size corresponding to the first hole 313 in the rear cover portion 310 of the rear cover 300.

[0304] The fixing bracket 401c may protrude from the lateral surface of the upper plate 401b. The fixing bracket 401c may be fixed to the rear cover portion 310 via a second coupling member 800, thereby securing the module frame 401 to the rear cover portion 310. The second coupling member 800 may be disposed between the fixing bracket 401c and the rear cover 300. The second coupling member 800 may be connected to the rear cover 300 via the fixing bracket 401c. For example, the second coupling member 800 may be a double-sided tape or a double-sided adhesive pad. For example, the second coupling member 800 may be a screw or a bolt.

[0305] The bobbin 402 may be provided on the module frame 401 such that a portion of its uppermost portion is inserted into or accommodated in the first hole 313. The bobbin 402 may vibrate (e.g., perform vertical reciprocating motion) based on magnetic force in the region 313a overlapping with the first hole 313 of the rear cover portion 310 to generate a sound pressure level in the region 313a overlapping with the first hole 313 of the rear cover portion 310. The bobbin 402 may vibrate or perform vertical reciprocating motion based on magnetic force, and thus, the bobbin 402 may vibrate a vibration member (or vibration plate) adjacent to the first hole 313 provided at the support member or the rear cover portion 310.

[0306] The bobbin 402 according to an exemplary embodiment of the present disclosure may be provided on the module frame 401 and may be configured to vibrate the rear cover portion 310. The bobbin 402 according to an exemplary embodiment of the present disclosure may be configured to have a hollow portion and be connected or coupled to the rear surface of the rear cover 300. For example, the bobbin 402 may be implemented to have an annular structure including at least one or more of materials formed of paper or pulp, aluminum, magnesium, and alloys thereof, synthetic resins including polypropylene, and fibers including polyamide, but the embodiments of the present disclosure are not limited thereto.

[0307] The bobbin 402 according to an exemplary embodiment of the present disclosure may have a circular, oval, or elliptical shape, but the embodiments of the present disclosure are not limited thereto. The elliptical shape of the bobbin 402 may be an oval, a rounded rectangle, or a non-circular curved shape with different widths and heights, but the embodiments of the present disclosure are not limited thereto. For example, when the bobbin is elliptical, the ratio of the major axis diameter to the minor axis diameter may be set to 1.3:1 to 2:1. Compared to a circular bobbin, an elliptical bobbin can further improve the sound of high-pitched vocal cords and can reduce the generation of heat caused by vibration, thereby having excellent heat dissipation characteristics.

[0308] The magnetic member 403 can be provided on the module frame 401 so as to be accommodated in the hollow portion of the bobbin 402. For example, the magnetic member 403 can be accommodated or inserted into the hollow portion of the bobbin 402. For example, the magnetic member 403 can be a permanent magnet. The magnetic member 403 can be implemented, for example, with a material such as barium ferrite, and the material of the magnetic member 403 can be iron oxide (Fe2O3), barium carbonate (BaCO3), neodymium (Nd) magnet, strontium ferrite with improved magnets, or alloy casting magnets of aluminum (Al), nickel (Ni), cobalt (Co), etc., but embodiments of the present disclosure are not limited thereto. For example, the neodymium magnet can be neodymium iron boron (Nd-Fe-B), but embodiments of the present disclosure are not limited to these examples.

[0309] The coil 404 can be wound around the lower outer peripheral surface of the bobbin 402 and can be supplied with a sound signal (or voice signal) from the outside. The coil 404 can be raised together with the bobbin 402. If a sound signal (or current) is applied to the coil 404, the bobbin 402 can vibrate, for example, based on the external magnetic field formed around the coil 404 and the external magnetic field formed around the magnetic member 403 according to Fleming's left-hand law for motors, it can reciprocate in the up and down directions. The coil 404 can be called a voice coil, but embodiments of the present disclosure are not limited thereto.

[0310] The central magnetic pole 405 may be disposed on the magnetic member 403 and may guide the vibration of the bobbin 402. For example, when the central magnetic pole 405 is inserted or accommodated in the hollow portion of the bobbin 402, the central magnetic pole 405 may be surrounded by the bobbin 402. The central magnetic pole 405 may be referred to as a lifting guide or a magnetic pole piece, but the disclosed embodiments are not limited thereto.

[0311] The damper 406 can be arranged between the module frame 401 and the bobbin 402. The damper 406 according to an exemplary embodiment of the present disclosure can be located between the frame body 401a of the module frame 401 and the upper circumferential surface of the bobbin 402. The damper 406 can have a pleated structure between its two ends, and the damper 406 can contract and / or relax according to the vibration of the bobbin 402. The damper 406 can control the vibration distance of the bobbin 402. For example, if the bobbin 402 vibrates above or below a specific distance, the bobbin 402 can be restored to its original position by the restoring force of the damper 406. The damper 406 can be referred to as a "spider", "shock absorber" or "edge". Each of the magnetic member 403, the coil 404, the central magnetic pole 405 and the damper 406 is arranged to overlap only with the first hole 313 and not with the rear cover portion 310.

[0312] According to another exemplary embodiment of the present disclosure, the first vibration device 400 has a relatively thin thickness so as not to increase the thickness of the device. Therefore, when the height (or thickness) of the bobbin 402 is reduced, this may cause a problem of reduced sound pressure. Therefore, in order to solve the problem of reduced sound pressure due to the reduction in the height of the bobbin 402, a structure for increasing the area of ​​the damper 406 provided around the bobbin 402 may be included. When the area of ​​the damper 406 is increased, the arrangement space for the wiring or line for applying current to the coil 404 becomes narrower, so that interference may occur between the wiring and the damper 406.

[0313] According to another exemplary embodiment of the present disclosure, the damper 406 may be configured in which the damper 406 may be simultaneously used as a conductor for wiring, and the damper 406 may include a metal material electrically connected to the coil 404. For example, the damper 406 may be formed of stainless steel or copper (Cu), but the embodiment is not limited thereto. According to an exemplary embodiment of the present disclosure, the shape of the damper 406 may be configured in a zigzag shape. When the damper 406 is configured diagonally, the damper may be disconnected due to the vertical movement of the damper 406, and when the length of the damper 406 is long, the damper 406 may affect the resonant frequency. For example, the overlapping portion between the damper 406 and the module frame 401 may be configured to have the same thickness and different widths, and disconnection in the overlapping portion therebetween may be avoided or prevented.

[0314] The first vibration device 400 according to an exemplary embodiment of the present disclosure may be referred to as an "internal" type, in which the magnetic member 403 may be inserted into or accommodated in the hollow portion of the bobbin 402. Alternatively, the first vibration device 400 according to another exemplary embodiment of the present disclosure may be an external type (or dynamic type), in which the magnetic member 403 may surround the circumferential surface of the bobbin 402. In the external type first vibration device 400, the magnetic member 403 may be located between the frame body 401a and the upper plate 401b, and the central magnetic pole 405 may be inserted into the hollow portion of the bobbin 402, or may be located on the frame body 401a or the lower plate. Except for these structures, the external type may be substantially the same as the internal type.

[0315] The second coupling member 800 can be disposed between the fixing bracket 401c of the module frame 401 and the rear cover portion 310 near the first hole 313 and can couple or secure the first sound generating device 410 and the second sound generating device 430 to the rear cover portion 300. The second coupling member 800 may include a double-sided tape, a single-sided tape, a single-sided foam tape, a double-sided foam tape, a single-sided foam pad, or a double-sided foam pad including an adhesive layer. The adhesive layer of the second coupling member 800 according to an exemplary embodiment of the present disclosure may include an acrylic-based or polyurethane-based adhesive material. For example, the adhesive layer of the second coupling member 800 may include a polyurethane-based adhesive material having a relatively higher hardness than an acrylic-based adhesive material and a relatively ductile property compared to an acrylic-based adhesive material, so as to minimize the transmission of vibrations of each of the first sound generating device 410 and the second sound generating device 430 to the rear cover portion 310, but embodiments of the present disclosure are not limited thereto. Therefore, the first vibration device 400 can be connected to the vibration member or the display member 100 via the second coupling member 800. In another exemplary embodiment, the first vibration device 400 may be connected to the rear cover portion 310 through a second coupling member 800 .

[0316] The second coupling member (or second connecting member) 800 according to an exemplary embodiment of the present disclosure may have a first thickness T1 of the rear cover portion 310 of the rear cover 300, and, for example, may have a second thickness T2 that is thicker than the first thickness T1 of the rear cover portion 310. The second thickness T2 of the second coupling member 800 according to an exemplary embodiment of the present disclosure may be one to four times the first thickness T1 of the rear cover portion 310. For example, when the second thickness T2 of the second coupling member 800 is less than one times the first thickness T1 of the rear cover portion 310, the distance (or interval) between the rearmost surface of the display member 100 and the bobbin 402 may be relatively short, and thus, the bobbin 402 vibrating in the thickness direction Z of the display member 100 may pass through the first hole 313 and may physically contact the rearmost surface of the display member 100, thereby potentially damaging the bobbin 402. On the other hand, when the second thickness T2 of the second coupling member 800 is greater than four times the first thickness T1 of the rear cover portion 310, the distance (or interval) between the rearmost surface of the display member 100 and the bobbin 402 may be relatively long. As a result, the transmission loss (or transfer loss) of the sound waves of the high-pitched vocal cords, which is proportional to the distance, may increase. As a result, the sound of the mid-high pitch vocal cords may not be achieved or the sound pressure level of the mid-high pitch vocal cords may be reduced, and a sound separation phenomenon may occur between the sound of the mid-high pitch vocal cords generated by the first vibration device 400 and the sound of the mid-low pitch vocal cords generated by the second vibration device 500. Therefore, the second thickness T2 of the second coupling member 800 can be adjusted to one to four times the first thickness T1 of the rear cover portion 310 so that the bobbin 402 does not physically contact the rearmost surface of the display member 100, stably vibrates in the first hole 313, and generates the sound of the mid-high pitch vocal cords and the sound pressure level of the mid-high pitch vocal cords.

[0317] According to another exemplary embodiment of the present disclosure, the second coupling member 800 may include a mechanical structure, and the second coupling member 800 may include at least one of a screw or a bolt that passes through the fixing bracket 401c and is connected to the rear cover portion 310. In this embodiment, a buffer ring is provided between the rear cover portion 310 and the fixing bracket 401c, and the buffer ring may prevent vibration of the rear cover portion 310 due to vibration of the first vibration device 400 transmitted to the module frame 401.

[0318] Each of the first and second sound generating devices 410 and 430 according to an exemplary embodiment of the present disclosure may further include a bobbin protection member (or protection member) 408 provided on the bobbin 402. For example, the bobbin protection member 408 may be provided between the bobbin 402 and the rear cover 300.

[0319] The bobbin protection member 408 according to an exemplary embodiment of the present disclosure may be formed in a cylindrical structure including an opening portion overlapping the hollow portion of the bobbin 402 and may be coupled or connected to the upper surface of the bobbin 402. The bobbin protection member 408 according to an exemplary embodiment of the present disclosure may cover the upper surface of the bobbin 402 to protect the bobbin 402, thereby preventing deformation of the bobbin 402 caused by external impact.

[0320] The bobbin protection member 408 according to an exemplary embodiment of the present disclosure may be formed in a plate structure that covers the entire upper surface and hollow portion of the bobbin 402 and may be coupled to the upper surface of the bobbin 402. A bobbin protection member 408 according to another exemplary embodiment of the present disclosure may cover the entire upper surface of the bobbin 402 to protect the bobbin 402, thereby preventing deformation of the bobbin 402 caused by external impact. Furthermore, the bobbin protection member 408 may be formed in a plate structure on the bobbin 402 and may increase the sound pressure level generated by the vibration of the bobbin 402.

[0321] The bobbin protection member 408 according to an exemplary embodiment of the present disclosure may be connected or coupled to the bobbin 402 by at least one of single-sided tape, double-sided tape, single-sided foam tape, double-sided foam tape, single-sided foam pad, double-sided foam pad, or adhesive resin. For example, the adhesive resin may be epoxy resin or acrylic resin, but the embodiments of the present disclosure are not limited thereto.

[0322] Therefore, each of the first sound generating device 410 and the second sound generating device 430 according to the exemplary embodiment of the present disclosure can vibrate independently without using the rear cover portion 310 as a vibration plate, and thus, a sound wave (or sound) transmitted through the first hole 313 can be generated and directly vibrate the display member 100, and the vibration of the rear cover portion 310 can be minimized to generate a stable sound pressure level, thereby minimizing the occurrence of noise caused by the vibration of the rear cover portion 310.

[0323] refer to Figure 1 、 Figure 2A and Figure 3 , a second vibration device 500 according to another exemplary embodiment of the present disclosure may include a first piezoelectric vibration device 510 and a second piezoelectric vibration device 530 .

[0324] Each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 can be supported by the rear cover portion 310 of the rear cover 300 to cover the second hole 315 in the rear cover portion 310. Each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 can vibrate based on the sound signal to vibrate the peripheral area EA of the display member 100, thereby generating the second sound S2 in the peripheral area EA of the display member 100. For example, each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 can vibrate based on the sound signal to generate a sound wave, which can pass through the second hole 315 and can be transmitted (or propagated) to the display member 100, and the peripheral area EA of the display member 100 can vibrate based on the sound wave transmitted through the second hole 315, thereby outputting the second sound S2 in the forward direction FD of the display member 100 at the peripheral area EA of the display member 10.

[0325] According to an exemplary embodiment of the present disclosure, the second hole 315 can serve as a sound wave propagation path (or sound energy incident portion) through which sound waves (or sounds) generated based on the vibration of each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 are directly propagated (or incident) toward the rear surface of the display member 100.

[0326] According to an exemplary embodiment of the present disclosure, each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 may not vibrate the rear cover portion 310 and may vibrate independently (or autonomously or individually), and therefore, the peripheral area EA of the display member 100 may be directly vibrated without using the rear cover portion 310 as a vibration plate and the vibration of the rear cover portion 310 may be minimized to generate a stable sound pressure level, thereby minimizing the occurrence of noise caused by the vibration of the rear cover portion 310.

[0327] Each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 according to the exemplary embodiment of the present disclosure may include a plate (substrate) 501 and a piezoelectric device 511 .

[0328] For example, Figure 5BAs illustrated in FIG, the plate 501 may be coupled or connected to the back cover portion 310 of the back cover 300 via a third coupling member (third connecting member / third adhesive member) 850. For example, the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 are connected to the plate 501 via the first adhesive member 512. The plate 501 may cover the second hole 315 formed in the back cover portion 310. For example, the plate 501 may have a size larger than the size of the second hole 315. For example, the plate 501 may be a base plate, a first plate, a support plate, a vibration object, or a connection plate, but embodiments of the present disclosure are not limited thereto. The plate 501 may include one or more of metal, paper, and a polymer film, but embodiments of the present disclosure are not limited thereto. The plate 501 may have at least one of a circular, oval, rectangular, or square shape, but embodiments of the present disclosure are not limited thereto. When the substrate 501 has a quadrilateral shape including a rectangular shape or a square shape, the first side and the second side perpendicular to the first side of the substrate 501 may be equal to each other, or the first side may be smaller or larger than the second side.

[0329] The plate 501 can be used as a vibration plate to generate a sound pressure level in the second hole 315. The plate 501 according to an exemplary embodiment of the present disclosure may include one or more of paper, fiber, fabric, leather, plastic, metal, stainless steel, aluminum (Al), magnesium (Mg), a magnesium alloy, a magnesium-lithium alloy (Mg-Li alloy), and an aluminum (Al) alloy, but the embodiments of the present disclosure are not limited thereto. For example, the plate 501 may have a third thickness T3 that is thinner than the first thickness T1 of the rear cover portion 310 to produce sounds of the mid- and high-pitched vocal range. When the third thickness T3 of the plate 501 is thicker than the first thickness T1, the vibration of the piezoelectric device 511 may be difficult to propagate (or transmit) to the interior of the second hole 315. Based on the vibration of the piezoelectric device 511, the plate 501 can vibrate to generate sounds (or sound pressure levels) of 3 kHz or higher in the mid- and high-pitched vocal range, and this sound can be propagated or transmitted to the interior of the second hole 315.

[0330] For example, Figure 5BAs illustrated in FIG, the third coupling member 850 can be disposed (or inserted) between the plate 501 and the rear cover portion 310 near the second hole 315 and can couple or secure the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 to the rear cover portion 310 (or rear cover 300). For example, the third coupling member 850 can be configured to have a quadrilateral strip shape. The third coupling member 850 can include at least one of a double-sided tape, a single-sided tape, a double-sided foam tape, a single-sided foam tape, a double-sided foam pad, or a single-sided foam pad having an adhesive layer. The adhesive layer of the third coupling member 850 according to an exemplary embodiment of the present disclosure can include an acrylic-based or polyurethane-based adhesive material. For example, the adhesive layer of the third coupling member 850 can include a polyurethane-based adhesive material having a relatively higher hardness than an acrylic-based adhesive material and a relatively ductile property compared to an acrylic-based adhesive material, so as to minimize the transmission of vibration of each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 to the rear cover portion 310, but embodiments of the present disclosure are not limited thereto.

[0331] For example, the third coupling member 850 and the first adhesive member 512 may have different moduli (or adhesive strength or hardness). For example, the modulus (or adhesive strength or hardness) of the third coupling member 850 may be greater than the modulus of the first adhesive member 512.

[0332] The piezoelectric device 511 may be provided at the plate 501 and may vibrate the plate 501. The piezoelectric device 511 may be provided at the rear surface of the plate 501 to overlap with the second hole 315 of the rear cover portion 310. For example, the piezoelectric device 511 may be coupled or connected to the plate 501 through the first adhesive member 512.

[0333] The piezoelectric device 511 according to an exemplary embodiment of the present disclosure may have a size smaller than that of the second hole 315 so as to be disposed at the region 315a overlapping the second hole 315 of the rear cover portion 310. For example, the central portion of the piezoelectric device 511 may be disposed at the central portion of the second hole 315. For example, the central portion of the piezoelectric device 511 may be disposed at the central portion of the second hole 315.

[0334] For example, Figure 5B As illustrated, the first adhesive member 512 may include a double-sided tape or a natural curable adhesive, but the embodiments of the present disclosure are not limited thereto. For example, the first adhesive member 512 may include a heat-curable adhesive or a UV-curable adhesive, but in this case, the characteristics of the piezoelectric device 511 may be degraded due to the heat generated during the curing process of the first adhesive member 512.

[0335] For example, Figure 5BAs illustrated, each of the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 according to the exemplary embodiment of the present disclosure may further include a cover plate 505 .

[0336] Reference Figure 3 and Figure 5B The cover plate 505 may be coupled or connected to the rear surface of the piezoelectric device 511 via the second adhesive member 514. The cover plate 505 may cover the rear surface of the piezoelectric device 511 to protect it. Furthermore, the cover plate 505 may reinforce or increase the mass of the first and second piezoelectric vibration devices 510 and 530 to reduce the resonant frequency of the first and second piezoelectric vibration devices 510 and 530 based on the increased mass, thereby increasing the sound pressure level characteristics of the low-pitched vocal range of the first and second piezoelectric vibration devices 510 and 530. The cover plate 505 according to an exemplary embodiment of the present disclosure may have the same material and thickness as those of the plate 501. However, embodiments of the present disclosure are not limited thereto, and the cover plate 505 may have a material or thickness different from that of the plate 501 based on the desired acoustic characteristics of the first and second piezoelectric vibration devices 510 and 530. For example, the cover plate 505 may be a plate, a second plate, a mass plate, a protection plate, a reinforcement plate, or a resonance control plate, but embodiments of the present disclosure are not limited thereto.

[0337] The second adhesive member 514 may include a double-sided tape or a natural curable adhesive, but the embodiments of the present disclosure are not limited thereto. For example, the second adhesive member 514 may include a heat-curable adhesive or a UV-curable adhesive, but in this case, the characteristics of the piezoelectric device 511 may be degraded due to the heat generated during the curing process of the second adhesive member 514.

[0338] Therefore, the device according to the exemplary embodiment of the present disclosure may have Figures 2A to 4 The same effect as the device illustrated in the embodiment of the present disclosure is achieved. In addition, in the device according to the exemplary embodiment of the present disclosure, the display member 100 can vibrate based on the sound waves generated by the vibration of each of the first vibration device 400 and the second vibration device 500 and passing through the first hole 313 and the second hole 315 to output sounds S1 and S2. Therefore, it is possible to vibrate based on the vibration of the display member 100 to output sounds S1 and S2 without using the back cover 300 as a vibration plate. Therefore, the vibration of the back cover portion 310 can be minimized, and thus the occurrence of noise caused by the vibration of the back cover portion 310 can be prevented or minimized.

[0339] Reference Figure 5B , the vibration device according to an exemplary embodiment of the present disclosure may include a first vibration device 400 and a second vibration device 500 located on the rear surface of the back cover 300 . Figure 5B The device shown including the second vibration device 500 may have Figure 5A The devices shown have substantially the same structure except for the structure of the second coupling member 800 , and therefore, for the sake of brevity, repeated description of the substantially same structure may be omitted.

[0340] The second coupling member 800 may include a structure surrounding the first vibration device 400. The second coupling member 800 may include a first portion 801 overlapping the fixing bracket 401c and a second portion 803 laterally protruding from the fixing bracket 401c and surrounding the first vibration device 400. The second surface of the second portion 803 of the second coupling member 800 may be connected or coupled to the rear cover portion 310. The first surface of the second portion 803 of the second coupling member 800 may be arranged on the same plane as the first surface of the fixing bracket 401c, but the embodiment of the present disclosure is not limited thereto. The first vibration device 400 may be connected or coupled to the rear cover portion 310 through the first portion 801 and the second portion 803 of the second coupling member 800, and thus, the first vibration device 400 is connected or coupled to the rear cover portion 310. Figure 5A Compared to the first vibration device 400, the bonding area or fixed area can be increased. For example, the first portion 801 and the second portion 803 of the second coupling member 800 can be made of the same material, or they can be made of different materials. For example, the first portion 801 and the second portion 803 of the second coupling member 800 can have the same modulus (or bonding strength or hardness), or they can have different moduli (or bonding strength or hardness).

[0341] The first portion 801 of the second coupling member 800 may be referred to as a coupling member, a connecting member, an adhesive member, etc. The second portion 803 of the second coupling member 800 may be referred to as an outer ring bracket, a side ring bracket, a ring bracket, an exciter bracket, etc.

[0342] The second coupling member 800 including the first part 801 and the second part 803 may include at least one of double-sided tape, single-sided tape, double-sided foam tape, single-sided foam tape, double-sided tape, double-sided foam pad, and single-sided foam pad.

[0343] Figure 6A is a cross-sectional view of a second vibration device according to an exemplary embodiment of the present disclosure.

[0344] Reference Figure 6A , the second vibration device 500 according to an exemplary embodiment of the present disclosure may include a vibration generator 540, a substrate (or plate) 501, a cover plate 505, and a third adhesive member 850. The vibration generator 540 is shown in FIG. Figure 6AThe vibration generator 540 may have a structure including a vibration device 511, a first adhesive member 512, and a second adhesive member 514. However, the structure of the vibration generator 540 is not limited thereto and may be defined as a structure further including a first cover member 513 and a second cover member 515, which will be described later. Figure 8 described in .

[0345] The vibration generator 540 may be configured to vibrate (or displace or drive) the vibration member based on a driving signal (or electrical signal or voice signal) applied thereto. For example, the vibration generator 540 may be referred to as a vibration device, a vibration structure, a vibrator, a vibration generating device, a sound-generating device, a sound-generating device, a sound-generating structure, or a sound-generating device, but embodiments of the present disclosure are not limited thereto.

[0346] The vibration generator 540 according to an exemplary embodiment of the present disclosure may include a piezoelectric material (or electroactive material) having piezoelectric properties. The vibration generator 540 may vibrate (or displace or drive) autonomously based on the vibration (or displacement or drive) of the piezoelectric material generated by the drive signal applied thereto, or may cause the vibration member to vibrate (or displace). For example, the vibration generator 540 may vibrate (or shift) as contraction and / or expansion alternately repeat through the piezoelectric effect (or piezoelectric properties). For example, when contraction and / or expansion alternately repeat through the inverse piezoelectric effect, the vibration generator 540 may vibrate (or shift or drive) in the vertical direction (or thickness direction) Z.

[0347] The vibration generator 540 may be configured to have flexibility. For example, the vibration generator 540 may be configured to be bent into a non-planar shape including a curved surface.

[0348] The vibration generator 540 according to an exemplary embodiment of the present disclosure may include a quadrilateral shape having a first length parallel to a first direction X and a second length parallel to a second direction Y intersecting the first direction X. For example, the vibration generator 540 may include a square having the same first length and the same second length, or may include a rectangle having different first length and second length.

[0349] The substrate 501 may be connected or attached to the first adhesive member 512. For example, the size or area of ​​the substrate 501 may be larger than the size or area of ​​the vibration generator 540. For example, the central portion of the substrate 501 may be aligned or positioned at the central portion of the vibration generator 540. The substrate 501 may be coupled to or attached to the rear cover portion 310. For example, the substrate 501 may be similar to the substrate 501 described above. Figure 5A The substrate 501 described is substantially the same. Therefore, like reference numerals refer to like elements and their repeated description may be omitted for the sake of brevity.

[0350] The cover plate 505 may be coupled or connected to the rear surface of the piezoelectric device 511 via the second adhesive member 514. The cover plate 505 may cover the rear surface of the piezoelectric device 511 to protect the piezoelectric device 511. In addition, the cover plate 505 may reinforce or increase the mass of the second vibration device 500 to reduce the resonant frequency of the second vibration device 500 based on the increase in mass, thereby increasing the sound pressure level characteristics of the low-pitched vocal range of the second vibration device 500.

[0351] about Figure 6A In the second vibration device 500 shown, the cover plate 505 is provided on the rear surface of the vibration generator 540. In another example, the cover plate 505 can be omitted as needed.

[0352] In addition to Figure 6A Except that the top and bottom (or upper or lower part) of the second vibration device 500 shown in FIG are reversed, the second vibration device 500 can be the same as that shown in FIG. Figure 5A and 5B The second vibration device 500 described is the same or substantially the same. Therefore, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0353] Figure 6B and Figure 6C yes Figure 6A An example plan view of a second vibration device.

[0354] Reference picture Figure 6B and Figure 6C , the vibration generator 540 may be rectangular or square, and the signal cable 519 may be disposed in at least a portion of the periphery of the vibration generator 540. When the vibration generator 540 has a rectangular or square shape, the first side of the vibration generator 540 having a first length L1 and the second side of the vibration generator 540 having a second length L2 orthogonal to the first side may be equal to each other, or the first side may be smaller than or larger than the second side. The sound processing circuit and the signal cable 519 may be electrically connected, and the second vibration device 500 may further include a carbon nanotube 520 or a wire formed at one end of the signal cable 519 and electrically connected to the sound processing circuit to apply vibration from the sound processing circuit to the signal cable 519. The size or area of ​​the substrate 501 may be larger than the size or area of ​​the vibration generator 540 and may have a quadrilateral or circular shape, but embodiments of the present disclosure are not limited thereto.

[0355] Figure 6D is a cross-sectional view of a second vibration device according to another exemplary embodiment of the present disclosure.

[0356] Reference Figure 6D, a second vibration device 500 according to another exemplary embodiment of the present disclosure may include a vibration generator 540 , a fourth connection member 560 , a substrate 501 , a cover plate 505 , and a third adhesive member 850 .

[0357] Each of the vibration generator 540 , the substrate 501 , the cover plate 505 , and the third adhesive member 850 of the second vibration device 500 may be the same as those described above with reference to FIG. Figure 5A and Figures 6A to 6C Those described are substantially the same, and thus, the same reference numerals refer to the same elements, and their repeated descriptions may be omitted for the sake of conciseness.

[0358] Figure 6D The second vibration device 500 shown in FIG. 5 may have Figure 6A The structure of the second vibration device 500 is shown to be substantially the same structure, except that the cover plate 505 is removed and a fourth connecting member 560 is included.

[0359] The fourth connecting member 560 can be connected or coupled to one of the first surface 540a of the vibration generator 540 and the second surface 540b that is different from (or opposite to) the first surface 540a. For example, in the vibration generator 540, the first surface 540a can be a top surface, a leading surface, a front surface, or an upper surface. In the vibration generator 540, the second surface 540b can be a bottom surface, a back surface, a rear surface, a lower surface, or a rearward-facing surface. For example, in the vibration generator 540, the first surface 540a can be arranged closer to the fourth connecting member 560 than the second surface 540b. For example, the fourth connecting member 560 can be a first connecting member, an adhesive member, or a first adhesive member.

[0360] The fourth connecting member 560 according to an exemplary embodiment of the present disclosure may include an adhesive layer (or viscous layer) having good adhesion or attachment force. For example, the fourth connecting member 560 may include a double-sided tape, a double-sided foam pad, or a viscous (or adhesive) sheet. For example, when the fourth connecting member 560 includes a viscous sheet (or viscous layer or adhesive layer), the fourth connecting member 560 may only include the adhesive layer or viscous layer without including a base member such as a plastic material or an adhesive.

[0361] The adhesive layer (or viscous layer) of the fourth connecting member 560 according to an exemplary embodiment of the present disclosure may include epoxy resin, acrylic, silicone resin or polyurethane, but the embodiments of the present disclosure are not limited thereto. The adhesive layer (or viscous layer) of the fourth connecting member 560 according to another exemplary embodiment of the present disclosure may include a pressure-sensitive adhesive (PSA), an optically clear adhesive (OCA) or an optically clear resin (OCR), but the embodiments of the present disclosure are not limited thereto.

[0362] According to the fourth connection member 560 of the exemplary embodiment of the present disclosure, Figure 6D As shown, the vibration generator 540 may be connected or coupled to the substrate 501. For example, a fourth connection member 560 may be provided between the substrate 501 and the first surface 540a of the vibration generator 540.

[0363] Figure 6E is a cross-sectional view of a second vibration device according to an exemplary embodiment of the present disclosure. Figure 6F and Figure 6G yes Figure 6E An example plan view of a second vibration device.

[0364] Reference Figures 6E to 6G , the second vibration device according to an exemplary embodiment of the present disclosure may include a vibration generator 540 , a substrate 501 , a cover plate 505 , a third adhesive member 850 , and a pad 580 .

[0365] Each of the vibration generator 540 , the substrate 501 , the cover plate 505 , and the third adhesive member 850 of the second vibration device 500 may be the same as those described above with reference to FIG. Figures 6A to 6C Those described are substantially the same, and thus, the same reference numerals refer to the same elements, and their repeated descriptions may be omitted for the sake of conciseness.

[0366] The pad 580 may be coupled to or attached to the second surface of the vibration generator 540. For example, the pad 580 may be coupled to or attached to the central portion of the second surface of the vibration generator 540. The pad 580 may have a size smaller than or equal to that of the vibration generator 540. For example, the pad 580 may have a polygonal column shape or a cylindrical shape, but embodiments of the present disclosure are not limited thereto.

[0367] about Figure 6E In the second vibration device 500 shown, the cover plate 505 is coupled or connected to the rear surface of the vibration generator 540. In another example, the cover plate 505 can be omitted as needed. Therefore, the pad 580 can be directly coupled or connected to the vibration generator 540.

[0368] The pad 580 according to an exemplary embodiment of the present disclosure may include a material having a stiffness less than the bending stiffness of the vibration generator 540. The pad 580 according to another exemplary embodiment of the present disclosure may include an elastic material, which may serve as a mass (or weight) on the vibration generator 540.

[0369] The pad 580 according to an exemplary embodiment of the present disclosure can increase the mass of the vibration generator 540, thereby reducing the lowest resonant frequency (or lowest natural frequency) of the vibration generator 540. Therefore, based on the mass increase caused by the pad 580, the vibration generator 540 can vibrate at a relatively low frequency due to the lowest resonant frequency (or lowest natural frequency). Therefore, the sound characteristics and / or sound pressure level characteristics of the vibration generator 540 can enhance the low-pitched vocal cords generated based on the vibration of the vibration generator 540. For example, the pad 580 can be a resonant pad, a mass member, a weighted beater, or a weighted member. For example, the low-pitched vocal cords can be about 300 Hz or about 500 Hz or less, but embodiments of the present disclosure are not limited thereto.

[0370] Figure 6H is a cross-sectional view of a second vibration device according to another exemplary embodiment of the present disclosure.

[0371] Reference Figure 6H , a second vibration device 500 according to another exemplary embodiment of the present disclosure may include a vibration generator 540, a substrate 501, a cover plate 505, a third adhesive member 850, and a pad 580. In another exemplary embodiment, the pad 580 may be omitted.

[0372] The second vibration device 500 may include a substrate 501 connected to the back cover 300 and a vibration generator 540 connected to the rear surface of the substrate 501. The vibration generator 540, the fourth connection member 560, the substrate 501, the third adhesive member 850, and the pad of the second vibration device 500 may be the same as those described above. Figures 6A to 6G The descriptions are substantially the same, and thus, the same reference numerals refer to the same elements, and their repeated descriptions may be omitted for the sake of brevity.

[0373] Figure 6H The second vibration device 500 shown may have Figure 6E The structure of the second vibration device 500 is shown to be substantially the same structure, except that the cover plate 505 is removed and a fourth connecting member 560 is included.

[0374] Figure 7 is a perspective view of a second vibration device 500 according to an exemplary embodiment of the present disclosure, and Figure 8 It is along Figure 7 A cross-sectional view taken along line II-II'.

[0375] refer to Figure 7 and Figure 8The second vibration device 500 according to the exemplary embodiment of the present disclosure may be referred to as a flexible vibration structure, a flexible vibrator, a flexible vibration generating device, a flexible vibration generator, a flexible sound generator, a flexible sound device, a flexible sound generating device, a flexible sound generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a thin film actuator, a thin film piezoelectric composite actuator, a thin film speaker, a thin film piezoelectric speaker or a thin film piezoelectric composite speaker, but the term is not limited thereto.

[0376] The vibration portion 511a may include a piezoelectric material. For example, the vibration portion 511a may include a piezoelectric material (or electroactive material) having a piezoelectric effect. For example, a piezoelectric material may have the following characteristics: when pressure or distortion is applied to the 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 (or cations) and negative (-) ions (or anions), and vibration is generated by an electric field based on the voltage applied thereto. The vibration portion 511a may be referred to as a term such as a vibration layer, a vibration structure, a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a vibration portion, a piezoelectric material portion, an electroactive portion, a piezoelectric structure, a piezoelectric composite material layer, a piezoelectric composite material, or a piezoelectric ceramic composite material, but the terms are not limited thereto. The vibration portion 511a may include a transparent conductive material, a translucent conductive material, or an opaque conductive material and may be transparent, translucent, or opaque.

[0377] The vibration part 511a according to an exemplary embodiment of the present disclosure may include a ceramic-based material for achieving relatively high vibration, or may include a piezoelectric ceramic having a crystal structure of perovskite. The perovskite crystal structure may have a piezoelectric effect and an inverse piezoelectric effect, and may be a plate-shaped structure with orientation. The perovskite crystal structure may be represented by the chemical formula "ABO3". In this chemical formula, "A" may include a divalent metal element, and "B" may include a tetravalent metal element. For example, in the chemical formula "ABO3", "A" and "B" may be cations, and "O" may be anions. For example, the vibration part 511a may include one or more of lead (II) titanate (PbTiO3), lead zirconate (PbZrO3), lead zirconate titanate (PbZrTiO3), barium titanate (BaTiO3) and strontium titanate (SrTiO3), but embodiments of the present disclosure are not limited thereto.

[0378] In the case where the perovskite crystal structure includes a central ion (e.g., PbTiO3), the position of the Ti ion can be changed due to external stress or magnetic field, and thus, the polarization or polarization can be changed, thereby generating a piezoelectric effect. For example, in the perovskite crystal structure, the cubic shape corresponding to the symmetric structure can be changed to a tetragonal, orthorhombic, or rhombohedral structure corresponding to the asymmetric structure, and thus, a piezoelectric effect can be generated. In the tetragonal, orthorhombic, or rhombohedral structure corresponding to the asymmetric structure, the polarization may be high in the morphotropic phase boundary (MPB), and the rearrangement of the polarization may be easy, whereby the perovskite crystal structure may have high piezoelectric properties.

[0379] According to an exemplary embodiment of the present disclosure, the vibration part 511a may include one or more materials of lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb), but the embodiments of the present disclosure are not limited thereto.

[0380] According to another exemplary embodiment of the present disclosure, the vibration part 511a may include single crystal ceramics or polycrystalline ceramics. Single crystal ceramics may be a material in which particles having a single crystal domain with a certain structure are regularly arranged. Polycrystalline ceramics may include irregular particles having various crystal domains.

[0381] According to another exemplary embodiment of the present disclosure, the vibration portion 511a may include a lead zirconate titanate (PZT)-based material containing lead (Pb), zirconium (Zr), and titanium (Ti), or may include a lead zirconate nickel niobate (PZNN)-based material containing lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb), but the embodiments of the present disclosure are not limited thereto. In another exemplary embodiment, the vibration portion 511a may include at least one or more of CaTiO3, BaTiO3, and SrTiO3 without Pb, but the embodiments of the present disclosure are not limited thereto.

[0382] According to another exemplary embodiment of the present disclosure, the vibration portion 511a may have a piezoelectric deformation modulus (or piezoelectric modulus) d of 1,000 pC / N or more based on the thickness direction Z thereof. 33 The vibration device may be applied to a vibration member or a display panel having a large size, and the vibration portion 511a may have a high piezoelectric deformation modulus d 33 , so as to have sufficient vibration characteristics or sufficient piezoelectric characteristics. For example, the vibration portion 511a may include a PZT-based material (PbZrTiO3) as a main component, and, for example, may include a softener dopant material doped in the A site (Pb) and a relaxor ferroelectric material doped in the B site (ZrTi).

[0383] The softener dopant material may enhance the piezoelectric and dielectric properties of the vibration portion 511a, and, for example, may increase the piezoelectric deformation modulus d of the vibration portion 511a. 33 . The softener dopant material according to an exemplary embodiment of the present disclosure may include a divalent element and a trivalent element. A morphotropic phase boundary (MPB) may be formed by adding the softener dopant material to the PZT-based material (PbZrTiO3), and thus, the piezoelectric and dielectric properties may be enhanced. For example, the softener dopant material may include strontium (Sr), barium (Ba), lanthanum (La), neodymium (Nd), calcium (Ca), yttrium (Y), erbium (Er), or ytterbium (Yb). For example, the ions (Sr), ions (Ba), ions (La), ions (Y) of the softener dopant material doped into the PZT-based material (PbZrTiO3) 2+ 、Ba 2+ 、La 2+ 、Nb 3+ , Ca 2+ 、Y 3+ 、Er 3+ or Yb 3+ ) can replace a portion of lead (Pb) in the PZT-based material (PbZrTiO3), and the substitution amount thereof can be about 2 mol% to about 20 mol%. For example, when the substitution amount is less than 2 mol% or greater than 20 mol%, the perovskite crystal structure may be broken, and thus, the electromechanical coupling coefficient kP and the piezoelectric deformation modulus d may be reduced. 33 When the softener dopant material is substituted, a morphotropic phase boundary (MPB) can be formed, and high piezoelectric properties and high dielectric properties can be achieved in the morphotropic phase boundary (MPB), thereby realizing a vibration device with high piezoelectric properties and high dielectric properties.

[0384] According to an exemplary embodiment of the present disclosure, the relaxor ferroelectric material doped into the PZT-based material (PbZrTiO3) can enhance the electrodeformation characteristics of the vibration portion 511a. The relaxor ferroelectric material according to the exemplary embodiment of the present disclosure may include a lead magnesium niobate (PMN)-based material or a lead nickel niobate (PNN)-based material, but the embodiments of the present disclosure are not limited thereto. The PMN-based material may include Pb, magnesium (Mg) and Nb, and may be, for example, Pb(Mg, Nb)O3. For example, the relaxor ferroelectric material doped into the PZT-based material (PbZrTiO3) may replace a portion of each of zirconium (Zr) and titanium (Ti) in the PZT-based material (PbZrTiO3), and the substitution amount thereof may be about 5 mol% to about 25 mol%. For example, when the substitution amount is less than 5 mol% or greater than 25 mol%, the perovskite crystal structure may be broken, and thus, the electromechanical coupling coefficient kP and the piezoelectric deformation modulus d may be reduced. 33 .

[0385] According to an exemplary embodiment of the present disclosure, the vibration portion 511a may further include a donor material doped into the B site (ZrTi) of the PZT-based material (PbZrTiO3) to additionally enhance the piezoelectric coefficient. For example, the donor material doped into the B site (ZrTi) may include a tetravalent to hexavalent element. For example, the donor material doped into the B site (ZrTi) may include tellurium (Te), germanium (Ge), uranium (U), bismuth (Bi), niobium (Nb), tantalum (Ta), antimony (Sb), or tungsten (W).

[0386] The vibration portion 511a according to the exemplary embodiment of the present disclosure may have a piezoelectric deformation modulus d of 1,000 pC / N or more based on the thickness direction Z thereof. 33 , thereby realizing a vibration device with enhanced vibration characteristics. For example, a vibration device with enhanced vibration characteristics can be realized in a large-area device or a vibration component (or a vibration object).

[0387] The first electrode portion 511b may be provided at the first surface (or upper surface) of the vibration portion 511a and may be electrically connected to the first surface of the vibration portion 511a. The second electrode portion 511c may be provided at a surface different from the first surface of the vibration portion 511a. For example, the vibration portion 511a may be polarized (or polarized (poling)) by applying a specific voltage to the first electrode portion 511b and the second electrode portion 511c in a certain temperature atmosphere or a temperature atmosphere changed from high temperature to room temperature.

[0388] For example, the first electrode portion 511b may have a common electrode form (or a single electrode) in which the first electrode portion 511b is provided on the entire first surface of the vibration portion 511a. The first electrode portion 511b according to an exemplary embodiment of the present disclosure may include 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 may include indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiments of the present disclosure are not limited thereto. The opaque conductive material may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), platinum (Pt), molybdenum (Mo), manganese (Mg), or an alloy thereof, but the exemplary embodiments of the present disclosure are not limited thereto.

[0389] The second electrode portion 511c may be provided at a second surface (or rear surface or back surface) of the vibration portion 511a that is opposite to or different from the first surface and may be electrically connected to the second surface of the vibration portion 511a. For example, the second electrode portion 511c may have a common electrode form (or a single electrode) in which the second electrode portion 511c is provided at the entire second surface of the vibration portion 511a. The second electrode portion 511c according to an exemplary embodiment of the present disclosure may include a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the second electrode portion 511c may include the same material as the first electrode portion 511b, but embodiments of the present disclosure are not limited thereto. In another exemplary embodiment of the present disclosure, the second electrode portion 511c may include a material different from that of the first electrode portion 511b.

[0390] According to another exemplary embodiment of the present disclosure, the second vibration device 500 may further include a first cover member 513 and a second cover member 515 .

[0391] The first cover member 513 may be provided on the first surface of the second vibration device 500. For example, the first cover member 513 may be provided in the first electrode portion 511b. For example, the first cover member 513 may be provided on the first electrode portion 511b. For example, the first cover member 513 may cover the first electrode portion 511b provided on the first surface of the vibration portion 511a, thereby protecting the first surface of the vibration portion 511a or the first electrode portion 511b.

[0392] The second cover member 515 may be provided on the second surface of the second vibration device 500. For example, the second cover member 515 may be provided in the second electrode portion 511c. For example, the second cover member 515 may be provided below the second electrode portion 511c. For example, the second cover member 515 may cover the second electrode portion 511c provided on the second surface of the vibration portion 511a, thereby protecting the second surface of the vibration portion 511a or the second electrode portion 511c.

[0393] Each of the first cover member 513 and the second cover member 515 according to an exemplary embodiment of the present disclosure may include one or more materials of plastic, fiber, and wood, but the embodiments of the present disclosure are not limited thereto. For example, each of the first cover member 513 and the second cover member 515 may include the same material or different materials. For example, each of the first cover member 513 and the second cover member 515 may be a polyimide film or a polyethylene terephthalate film, but the embodiments of the present disclosure are not limited thereto. For example, each of the first cover member 513 and the second cover member 515 may include a double-sided insulating tape, a single-sided insulating tape, a single-sided insulating foam tape, or a double-sided insulating foam tape having an adhesive layer attached to the rear surface or the front surface of the piezoelectric device 511.

[0394] The vibration device 500 according to another exemplary embodiment of the present disclosure may further include a first adhesive layer 512 and a second adhesive layer 514. For example, the first adhesive layer 512 may be disposed between the first cover member 513 and the first electrode portion 511b. For example, the second adhesive layer 514 may be disposed between the second cover member 515 and the second electrode portion 511c.

[0395] The first cover member 513 according to the exemplary embodiment of the present disclosure can be provided at the first surface of the vibration part 511a through the first adhesive layer 512. For example, the first cover member 513 can be connected or coupled to the first electrode part 511b through the first adhesive layer 512. For example, the first cover member 513 can be provided at the first surface of the vibration part 511a through a film lamination process using the first adhesive layer 512. Therefore, the vibration part 511a can be integrated (or provided) into the first cover member 513.

[0396] The second cover member 515 according to the exemplary embodiment of the present disclosure may be provided at the second surface of the vibration portion 511a through the second adhesive layer 514. For example, the second cover member 515 may be connected or coupled to the second electrode portion 511c through the second adhesive layer 514. For example, the second cover member 515 may be provided on the second surface of the vibration portion 511a through a film lamination process using the second adhesive layer 514. Thus, the vibration portion 511a may be integrated (or provided) into the second cover member 515.

[0397] For example, the first adhesive layer 512 and the second adhesive layer 514 can completely surround the vibration device 500 or the vibration device 511. For example, the first adhesive layer 512 and the second adhesive layer 514 can be provided between the first cover member 513 and the second cover member 515 to surround the vibration part 511a, the first electrode part 511b, and the second electrode part 511c. For example, the first adhesive layer 512 and the second adhesive layer 514 can be provided between the first cover member 513 and the second cover member 515 to completely or entirely surround the vibration part 511a, the first electrode part 511b, and the second electrode part 511c. For example, the vibration part 511a, the first electrode part 511b, and the second electrode part 511c can be buried or embedded between the first adhesive layer 512 and the second adhesive layer 514. For convenience of description, the first adhesive layer 512 and the second adhesive layer 514 are illustrated as at least two adhesive layers, but are not limited thereto and can be provided as one adhesive layer.

[0398] Each of the first adhesive layer 512 and the second adhesive layer 514 according to an exemplary embodiment of the present disclosure may include an electrically insulating material having adhesive properties and capable of compression and decompression. For example, each of the first adhesive layer 512 and the second adhesive layer 514 may include epoxy resin, acrylic resin, silicone resin, or polyurethane resin, but the embodiments of the present disclosure are not limited thereto.

[0399] The audio controller can generate an alternating current (AC) vibration drive signal comprising a first vibration drive signal and a second vibration drive signal based on a sound source (or sound signal). The first vibration drive signal can be one of a positive (+) vibration drive signal and a negative (-) vibration drive signal, and the second vibration drive signal can be one of a positive (+) vibration drive signal and a negative (-) vibration drive signal. For example, the first vibration drive signal can be supplied to the first electrode portion 511b of the vibration device 500 by the terminal of the signal cable 519, the pad electrode of the pad portion and the first power line. The second vibration drive signal can be supplied to the second electrode portion 511c of the vibration device 500 by the terminal of the signal cable, the pad electrode of the pad portion and the second power line.

[0400] According to the exemplary embodiment of the present disclosure, the vibration part 511 a may be integrated by the first cover member 513 and the second cover member 515 , and thus, a vibration device having a simple structure and a thin thickness may be provided.

[0401] One or more first power lines PL1 of the vibration device 500 may extend long in the second direction Y. The first power line PL1 may be provided at the first cover member 513 and may be electrically connected to the first electrode portion 511b. For example, the first power line PL1 may be provided at the rear surface of the first cover member 513 facing the first electrode portion 511b and may be electrically connected to the first electrode portion 511b. For example, the first power line PL1 may be provided at the rear surface of the first cover member 513 directly facing the first electrode portion 511b and may be directly electrically connected to the first electrode portion 511b. In an exemplary embodiment of the present disclosure, the first power line PL1 may be electrically connected to the first electrode portion 511b by using an anisotropic conductive film. In another exemplary embodiment of the present disclosure, the first power line PL1 may be electrically connected to the first electrode portion 511b by a conductive material (or particles) in the first adhesive layer 512.

[0402] The pad portion 517 may be provided at the center portion of the first vibration generating portion 500A and the second vibration generating portion 500B. The pad portion 517 may be electrically connected to a first portion (one side or one end) of one or more of the first power line PL1 and the second power line PL2. For example, the pad portion 517 may be provided at an edge portion or peripheral portion of one or more of the first cover member 513 and the second cover member 515. The pad portion 517 may be electrically connected to a first portion (one side or one end) of one or more of the first power line PL1 and the second power line PL2.

[0403] The pad portion 517 according to an exemplary embodiment of the present disclosure may include a first pad electrode electrically connected to a first portion (one side or one end) of the first power line PL1 and a second pad electrode electrically connected to a first portion (one side or one end) of the first power line PL1. For example, one or more of the first pad electrode and the second pad electrode may be exposed at a first edge portion (or first peripheral portion) of one or more of the first cover member 513 and the second cover member 515.

[0404] Figure 9 、 Figure 10 、 Figure 11 and Figure 12 is a perspective view of a vibration portion of a second vibration device 500 according to one or more exemplary embodiments of the present disclosure.

[0405] refer to Figure 9 、 Figure 10 、 Figure 11 and Figure 12 , the vibration part 511 a according to one or more exemplary embodiments of the present disclosure may include a first vibration part 511 a 1 and a second vibration part 511 a 2 .

[0406] refer to Figure 9 、 Figure 10 、 Figure 11 and Figure 12 The vibration part 511a according to one or more exemplary embodiments of the present disclosure may be referred to as a flexible vibration structure, a flexible vibrator, a flexible vibration generating device, a flexible vibration generator, a flexible sound generator, a flexible sound device, a flexible sound generating device, a flexible sound generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a thin film actuator, a thin film piezoelectric composite actuator, a thin film speaker, a thin film piezoelectric speaker or a thin film piezoelectric composite speaker, but the term is not limited thereto.

[0407] The vibration part 511a according to an exemplary embodiment of the present disclosure may include a plurality of first parts 511a1 and a plurality of second parts 511a2. For example, the plurality of first parts 511a1 and the plurality of second parts 511a2 may be arranged alternately and repeatedly in a first direction X (or a second direction Y). For example, the first direction X may be the width direction of the vibration part 511a, and the second direction Y may be the longitudinal direction of the vibration part 511a intersecting with the first direction X, but the embodiments of the present disclosure are not limited thereto. For example, the first direction X may be the longitudinal direction of the vibration part 511a, and the second direction Y may be the width direction of the vibration part 511a.

[0408] Each of the plurality of first portions 511a1 may include an inorganic material portion. For example, the inorganic material portion may include a piezoelectric material having a piezoelectric effect, a composite piezoelectric material, or an electroactive material. For example, each of the plurality of first portions 511a1 may be referred to as an electroactive portion, an inorganic material portion, a piezoelectric material portion, or a vibration portion, but embodiments of the present disclosure are not limited thereto.

[0409] Each of the plurality of first portions 511a1 may include a ceramic-based material for achieving relatively high vibration, or may include a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure may have a piezoelectric effect and an inverse piezoelectric effect, and may be a plate-shaped structure with orientation. The perovskite crystal structure may be represented by the chemical formula "ABO3". In this chemical formula, "A" may include a divalent metal element, and "B" may include a tetravalent metal element. For example, in the chemical formula "ABO3", "A" and "B" may be cations, and "O" may be anions. For example, the first portion 51a may include one or more of lead (II) titanate (PbTiO3), lead zirconate (PbZrO3), lead zirconate titanate (PbZrTiO3), barium titanate (BaTiO3), and strontium titanate (SrTiO3), but embodiments of the present disclosure are not limited thereto.

[0410] The vibration portion 511a according to an exemplary embodiment of the present disclosure may include a lead zirconate titanate (PZT)-based material containing lead (Pb), zirconium (Zr), and titanium (Ti), or may include a lead zirconate nickel niobate (PZNN)-based material containing lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb), but is not limited thereto. In another exemplary embodiment of the present disclosure, the vibration portion 511a may include at least one of CaTiO3, BaTiO3, and SrTiO3 without Pb, but embodiments of the present disclosure are not limited thereto.

[0411] In the vibration part 511a, multiple first parts 511a1 and multiple second parts 511a2 can be arranged (or arranged) in parallel on the same plane (or the same layer). Multiple second parts 511a2 can be arranged between multiple first parts 511a1. For example, multiple second parts 511a2 can include polygonal patterns. Each of the multiple second parts 511a2 can be configured to fill the gap between two adjacent first parts 511a1 and can be connected or adhered to the adjacent first parts 511a1. Therefore, the vibration part 511a can be extended to a desired size or length based on the lateral connection (or coupling) between the first part 511a1 and the second part 511a2.

[0412] refer to Figure 9 The vibration part 511a of the vibration device 511 according to the exemplary embodiment of the present disclosure may include a plurality of first parts 511a1 and a plurality of second parts 511a2 arranged alternately and repeatedly in the first direction X. Each of the plurality of first parts 511a1 may be disposed between the plurality of second parts 511a2 and may 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). Each of the plurality of second parts 511a2 may 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 may be the same as or different from the second width W2. For example, the first width W1 may be greater than the second width W2. For example, the first part 511a1 and the second part 511a2 may include a line shape or a bar shape having the same size or different sizes. Therefore, the vibration part 511a may have a 2-2 type composite structure having piezoelectric characteristics of a 2-2 vibration mode and may have a resonant frequency of 20 kHz or less, but the embodiments of the present disclosure are not limited thereto. For example, the resonant frequency of the vibration part 511a may vary based on one or more of shape, length, or thickness.

[0413] refer to Figure 10, the vibration part 511a of the vibration device 511 according to the exemplary embodiment of the present disclosure may include a plurality of first parts 511a1 and a plurality of second parts 511a2. For example, the plurality of first parts 511a1 and the plurality of second parts 511a2 may be alternately and repeatedly arranged in the second direction Y. Each of the plurality of first parts 511a1 may be disposed between the plurality of second parts 511a2 and may have a third width W3 parallel to the second direction Y and a length parallel to the first direction X (or the second direction Y). Each of the plurality of second parts 511a2 may have a fourth width W4 that is the same as the third width W3 and may have a length parallel to the first direction X (or the second direction Y). For example, the first part 511a1 and the second part 511a2 may include a line shape or a strip shape having the same size or different sizes. Therefore, Figure 10 The vibration portion 511a of the illustrated vibration device 511 may have a 2-2 type compound and may have a resonant frequency of 20 kHz or less, but the embodiments of the present disclosure are not limited thereto. For example, the resonant frequency of the vibration portion 511a may vary based on one or more of shape, length, or thickness.

[0414] In the vibration portion 511a, the width W2 of each of the plurality of second portions 511a2 may gradually decrease in a direction from a central portion of the vibration portion 511a or the vibration device 511 to both edge portions (or both ends or both peripheries) thereof.

[0415] According to an exemplary embodiment of the present disclosure, when the vibration portion 511a or the vibration device 511 vibrates in the vertical direction Z (or thickness direction), the second portion 511a2 having the largest width W4 among the plurality of second portions 511a2 can be disposed at a portion where the relatively largest stress is concentrated. When the vibration portion 511a or the vibration device 511 vibrates in the vertical direction Z, the second portion 511a2 having the smallest width W4 among the plurality of second portions 511a2 can be disposed at a portion where the relatively smallest stress occurs. For example, the second portion 511a2 having the largest width W4 among the plurality of second portions 511a2 can be disposed at the central portion of the vibration portion 511a, while the second portion 511a2 having the smallest width W4 among the plurality of second portions 511a2 can be disposed at both edge portions (or both ends or both peripheries) of the vibration portion 511a. Therefore, when the vibration part 511a or the vibration device 511 vibrates in the vertical direction Z, the overlap of the resonance frequency or interference of the sound waves occurring at the part where the maximum stress is concentrated on the upper side can be minimized, and thus, the inclination of the sound pressure level occurring in the low-pitched vocal band can be reduced, and the flatness of the sound characteristics in the low-pitched vocal band can be improved.

[0416] In the vibration part 511a, the multiple first parts 511a1 can have different sizes (or widths). For example, the size (or width) of each of the multiple first parts 511a1 can be gradually reduced or increased in the direction from the central part of the piezoelectric vibration part 511a or the vibration device 511 to its two edge parts (or two ends or two peripheries). In this case, the sound pressure level characteristics of the sound of the vibration part 511a can be enhanced by the various natural vibration frequencies based on the vibration of the multiple first parts 511a1 having different sizes, and the sound reproduction band can be extended.

[0417] Each of the plurality of second portions 511a2 can be disposed between the plurality of first portions 511a1. Thus, in the vibration portion 511a or the vibration device 511, the vibration energy of the links in the unit cell of the first portion 511a1 can be increased by the second portions 511a2, thereby increasing the vibration characteristics and ensuring piezoelectric characteristics and flexibility. For example, the second portions 511a2 can include one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but embodiments of the present disclosure are not limited thereto.

[0418] Each of the plurality of second portions 511a2 according to an exemplary embodiment of the present disclosure may be constructed with an organic material portion. For example, the organic material portion may be provided between two adjacent inorganic material portions, thereby absorbing an impact applied to the inorganic material portion (or the first portion) and releasing stress concentrated on the inorganic material portion, thereby enhancing the durability of the vibration portion 511a or the vibration device 511 and achieving flexibility of the vibration portion 511a or the vibration device 511.

[0419] The second portion 511a2 according to an exemplary embodiment of the present disclosure may have a lower viscoelastic property and modulus (or Young's modulus) than those of the first portion 511a1. Thus, the second portion 511a2 may enhance the reliability of the first portion 511a1, which is susceptible to impact due to its fragile or fragile nature. For example, the second portion 511a2 may include a material having a loss factor of about 0.01 to about 1 and a modulus of about 0.1 GPa (gigapascal) to about 10 GPa (gigapascal).

[0420] The organic material portion of the second portion 511a2 may include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material having flexibility compared to the inorganic material portion of the first portion 511a1. For example, the second portion 511a2 may be referred to as an adhesive portion, an extendable portion, a bending portion, a damping portion, or a ductile portion, but the embodiments of the present disclosure are not limited thereto.

[0421] Multiple first portions 511a1 and multiple second portions 511a2 can be arranged on the same plane (or connected to the same plane), thus, the vibration portion 511a according to the exemplary embodiment of the present disclosure can have a single thin film form. For example, the vibration portion 511a can have a structure in which multiple first portions 511a1 are connected to one side of the vibration portion 511a. For example, the vibration portion 511a can have a structure in which multiple first portions 511a1 are connected throughout the vibration portion 511a. For example, the vibration portion 511a can vibrate in a vertical direction using the first portion 511a1 having vibration characteristics and can be bent into a curved shape using the second portion 511a2 having flexibility. In addition, in the vibration portion 511a according to the exemplary embodiment of the present disclosure, the size of the first portion 511a1 and the size of the second portion 511a2 can be adjusted based on the piezoelectric characteristics and flexibility required for the vibration portion 511a or the vibration device 511. For example, in a vibration portion 511a that requires piezoelectric characteristics rather than flexibility, the size of the first portion 511a1 can be adjusted to be larger than the size of the second portion 511a2. As another exemplary embodiment of the present disclosure, in the vibration portion 511a where flexibility rather than piezoelectric characteristics are required, the size of the second portion 511a2 can be adjusted to be larger than the size of the first portion 511a1. Therefore, the size of the vibration portion 511a can be adjusted based on the desired characteristics, and the vibration portion 511a can be easily designed.

[0422] refer to Figure 11 , a vibration part 511 a according to another exemplary embodiment of the present disclosure may include a plurality of first parts 511 a 1 separated from each other in the first direction X and the second direction Y and a second part 511 a 2 disposed between the plurality of first parts 511 a 1 .

[0423] The plurality of first portions 511a1 may be spaced apart from each other in each of the first direction X and the second direction Y. For example, the plurality of first portions 511a1 may have a hexahedral shape of the same size and may be arranged in a lattice shape. Each of the plurality of first portions 511a1 may include the same Figure 9 and Figure 10 The material of the described first portion 511 a 1 is substantially the same material, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0424] The second portion 511a2 may be disposed between a plurality of first portions 511a1 in each of the first direction X and the second direction Y. The second portion 511a2 may be configured to fill a gap between two adjacent first portions 511a1 or surround each of the plurality of first portions 511a1, and thus, may be connected to or attached to an adjacent first portion 511a1. According to an exemplary embodiment of the present disclosure, the width of the second portion 511a2 disposed between two first portions 511a1 adjacent to each other along the first direction X may be the same as or different from the width of the first portion 21a1, and the width of the second portion 511a2 disposed between two first portions 511a1 adjacent to each other along the second direction Y may be the same as or different from the width of the first portion 511a1. The second portion 511a2 may include the same width as the first portion 511a1 as described above. Figure 9 and Figure 10 The material of the described second portion 511 a 2 is substantially the same material, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0425] As described above, the vibration portion 511a according to another exemplary embodiment of the present disclosure may include a 1-3 type composite structure having piezoelectric characteristics of a 1-3 vibration mode, and thus may have a resonant frequency of 30 MHz or less, but the embodiments of the present disclosure are not limited thereto. For example, the resonant frequency of the piezoelectric vibration portion 511a may vary based on one or more of its shape, length, or thickness.

[0426] refer to Figure 11 , a vibration part 511a according to another exemplary embodiment of the present disclosure may include a plurality of first parts 511a1 spaced apart from each other in the first direction X and the second direction Y and a second part 511a2 disposed between the plurality of first parts 511a1.

[0427] Each of the plurality of first portions 511a1 may have a planar structure having a circular shape. For example, each of the plurality of first portions 511a1 may have a circular plate shape, but the embodiments of the present disclosure are not limited thereto. For example, each of the plurality of first portions 511a1 may have a point shape including an elliptical shape, a polygonal shape, or a circular ring shape. Each of the plurality of first portions 511a1 may include the same Figure 9 and Figure 10 The piezoelectric material of the described first portion 511 a 1 is substantially the same piezoelectric material, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0428] The second portion 511a2 may be disposed between the plurality of first portions 511a1 in each of the first direction X and the second direction Y. The second portion 511a2 may be configured to surround each of the plurality of first portions 511a1 and, therefore, may be connected to or attached to a lateral surface of each of the plurality of first portions 511a1. The plurality of first portions 511a1 and the second portion 511a2 may be disposed (or arranged) in parallel on the same plane (or the same layer). The second portion 511a2 may include the same configuration as that described above. Figure 9 and Figure 10 The organic material of the described second portion 511 a 2 is substantially the same organic material, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0429] refer to Figure 12 In a vibration device 511 according to another exemplary embodiment of the present disclosure, a vibration portion 511a may include a plurality of first portions 511a1Y spaced apart from each other in the first direction X and the second direction and a second portion 511a2 disposed between the plurality of first portions 511a1.

[0430] Each of the plurality of first portions 511a1 may have a planar structure having a triangular shape. For example, each of the plurality of first portions 511a1 may have a triangular plate shape, but the embodiments of the present disclosure are not limited thereto. Each of the plurality of first portions 511a1 may include the same Figure 9 and Figure 10 The material of the described first portion 511 a 1 is substantially the same material, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0431] According to an exemplary embodiment of the present disclosure, four adjacent first portions 511a1 among the plurality of first portions 511a1 may be disposed adjacent to each other to form a quadrilateral shape (or square shape). The vertices of each of the four adjacent first portions 511a1 forming the quadrilateral shape may be disposed adjacent to the middle portion (or central portion) of the quadrilateral shape.

[0432] The second portion 511a2 may be disposed between the plurality of first portions 511a1 in each of the first direction X and the second direction Y. The second portion 511a2 may be configured to surround each of the plurality of first portions 511a1 and, therefore, may be connected to or attached to a lateral surface of each of the plurality of first portions 511a1. The plurality of first portions 511a1 and the second portion 511a2 may be disposed (or arranged) in parallel on the same plane (or the same layer). The second portion 511a2 may include the same configuration as that described above. Figure 9 and Figure 10 The material of the described second portion 511 a 2 is substantially the same material, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0433] Figure 13A and Figure 13B is a plan view of a vibration device according to an exemplary embodiment of the present disclosure, and Figure 14 It is along Figure 13A and Figure 13B An example of a cross-sectional view taken along line III-III'.

[0434] refer to Figure 13A 、 Figure 13B and Figure 14 , a vibration device 500 according to another exemplary embodiment of the present disclosure may include a first vibration generating part 500A and a second vibration generating part 500B.

[0435] The first vibration generating part 500A and the second vibration generating part 500B can be spaced apart from each other in the first direction X and electrically disconnected (or isolated). Each of the first vibration generating part 500A and the second vibration generating part 500B can alternately and repeatedly contract and / or expand to vibrate based on the piezoelectric effect. For example, the first vibration generating part 500A and the second vibration generating part 500B can be arranged or tiled at a specific interval D1 in the first direction X. Therefore, the vibration device 500 in which the first vibration generating part 500A and the second vibration generating part 500B are tiled can be a vibration array, a vibration array part, a vibration module array part, a vibration array structure, a tiled vibration array, a tiled array module or a tiled vibration membrane.

[0436] Each of the first vibration generating part 500A and the second vibration generating part 500B according to an exemplary embodiment of the present disclosure may have a quadrilateral shape. For example, each of the first vibration generating part 500A and the second vibration generating part 500B may have a quadrilateral shape with a width of 5 cm or more. For example, each of the first vibration generating part 500A and the second vibration generating part 500B may have a square shape with a size of 5 cm×5 cm or more, but embodiments of the present disclosure are not limited thereto.

[0437] Each of the first vibration generating part 500A and the second vibration generating part 500B can be arranged or tiled on the same plane, and thus the vibration device 500 can be implemented as a vibration device having a large area by tiling the first vibration generating part 500A and the second vibration generating part 500B having a relatively small size.

[0438] The first vibration generating part 500A and the second vibration generating part 500B can be arranged or tiled at a certain interval, and thus can be implemented as a vibration device (or a single vibration device) driven as a complete unit rather than being driven independently. According to an exemplary embodiment of the present disclosure, with respect to the first direction X, the first separation distance D1 between the first vibration generating part 500A and the second vibration generating part 500B can be 0.1 mm or greater and less than 3 cm, but embodiments of the present disclosure are not limited thereto.

[0439] According to an exemplary embodiment of the present disclosure, the first vibration generating part 500A and the second vibration generating part 500B can be arranged or laid out with a separation distance (or interval) D1 of 0.1 mm or more and less than 3 cm, so that they can be driven as a vibration device, and the sound pressure level characteristics of the sound and the reproduction band of the sound generated based on the single vibration of each of the first vibration generating part 500A and the second vibration generating part 500B can be increased. For example, the first vibration generating part 500A and the second vibration generating part 500B can be arranged with a separation distance D1 of 0.1 mm or more and less than 5 mm to increase the reproduction band of the sound generated based on the single vibration of each of the first vibration generating part 500A and the second vibration generating part 500B and increase the sound pressure level characteristics of the sound in the low-pitched vocal range (for example, at 500 Hz or less).

[0440] According to an exemplary embodiment of the present disclosure, in the case where the first vibration generating part 500A and the second vibration generating part 500B are arranged with an interval D1 of less than 0.1 mm or in the absence of the interval D1, the reliability of the first vibration generating part 500A and the second vibration generating part 500B or the vibration device 500 may be reduced due to the occurrence of damage or cracks caused by physical contact between the first vibration generating part 500A and the second vibration generating part 500B when the first vibration generating part 500A and the second vibration generating part 500B are vibrating.

[0441] According to an exemplary embodiment of the present disclosure, when the first vibration generating part 500A and the second vibration generating part 500B are arranged at an interval D1 of 3 cm or more, the first vibration generating part 500A and the second vibration generating part 500B may not be driven as a vibration device due to the independent vibration of each of the first vibration generating part 500A and the second vibration generating part 500B. Therefore, the sound pressure level characteristics of the sound and the reproduction band of the sound generated based on the vibration of each of the first vibration generating part 500A and the second vibration generating part 500B can be reduced. For example, when the first vibration generating part 500A and the second vibration generating part 500B are arranged at an interval D1 of 3 cm or more, each of the sound characteristics and the sound pressure level characteristics in the low-pitched vocal range (e.g., at 500 Hz or less) may be reduced.

[0442] According to an exemplary embodiment of the present disclosure, when the first vibration generating part 500A and the second vibration generating part 500B are arranged at an interval D1 of 5 mm, each of the first vibration generating part 500A and the second vibration generating part 500B may not be driven as a vibration device, and therefore, each of the sound characteristics and the sound pressure level characteristics in the low-pitched vocal band (for example, at 200 Hz or less) may be reduced.

[0443] According to another exemplary embodiment of the present disclosure, when the first vibration generating part 500A and the second vibration generating part 500B are arranged at a spacing D1 of 1 mm, the first vibration generating part 500A and the second vibration generating part 500B can be driven as a vibration device, thereby increasing the reproduction range of the sound and increasing the sound pressure level characteristics of the sound in the low-pitched vocal range (e.g., at 500 Hz or less). For example, when the first vibration generating part 500A and the second vibration generating part 500B are arranged at a spacing D1 of 1 mm, the separation distance between the first vibration generating part 500A and the second vibration generating part 500B can be optimized, thereby realizing the vibration device 500 as a vibrator having a large area. Therefore, the vibration device 500 can be driven as a large-area vibrator based on the single vibration of the first vibration generating part 500A and the second vibration generating part 500B. Therefore, the sound characteristics and sound pressure level characteristics in the low-pitched vocal range and reproduction range of the sound generated based on the large-area vibration of the vibration device 500 can be increased or enhanced.

[0444] Therefore, in order to achieve single-unit vibration of the first vibration generating part 500A and the second vibration generating part 500B (or a single vibration device), the separation distance D1 between the first vibration generating part 500A and the second vibration generating part 500B can be adjusted to 0.1 mm or greater and less than 3 cm. In addition, in order to increase the sound pressure level characteristics of the sound of the low-pitched vocal range together with achieving single-unit vibration of the first vibration generating part 500A and the second vibration generating part 500B (or a single vibration device), the separation distance D1 between the first vibration generating part 500A and the second vibration generating part 500B can be adjusted to 0.1 mm or greater and less than 5 mm.

[0445] Each of the first vibration generating part 500A and the second vibration generating part 500B according to the exemplary embodiment of the present disclosure may include a piezoelectric vibration part 511 a , a first electrode part 511 b , and a second electrode part 511 c .

[0446] The vibration portion 511a of each of the first vibration generating portion 500A and the second vibration generating portion 500B may include a piezoelectric material (or an electroactive material) having a piezoelectric effect. For example, the vibration portion 511a of each of the first vibration generating portion 500A and the second vibration generating portion 500B may be the same as that described above. Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12 One of the described vibration parts 511a is substantially the same, and therefore, a repeated description thereof may be omitted.

[0447] According to an exemplary embodiment of the present disclosure, each of the first vibration generating part 500A and the second vibration generating part 500B may include one vibration part 511a or the above reference Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12 Described among the different piezoelectric vibration portion 511a of the vibration portion 21a.

[0448] The first electrode portion 511b may be provided at the first surface of the vibration portion 511a and may be electrically connected to the first surface of the vibration portion 511a. Figure 8 The described first electrode portion 511 b is substantially the same, and thus, the same reference numerals refer to the same elements and a repeated description thereof may be omitted.

[0449] The second electrode portion 511c may be provided at the second surface of the vibration portion 511a and may be electrically connected to the second surface of the vibration portion 511a. Figure 8 The described first electrode portion 511 b is substantially the same, and thus, the same reference numerals refer to the same elements and a repeated description thereof may be omitted.

[0450] The vibration device 500 according to another exemplary embodiment of the present disclosure may further include a first cover member 513 and a second cover member 515 .

[0451] The first cover member 513 can be provided on the first surface of the vibration device 500. For example, the first cover member 513 can be provided in the first electrode portion 511b provided on the first surface of the first vibration generating part 500A and the second vibration generating part 500B, and thus can be commonly connected to the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B and can jointly support the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B. Therefore, the first cover member 513 can protect the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B or the first electrode portion 511b.

[0452] The second cover member 515 may be provided at the second surface of the vibration device 500. For example, the second cover member 515 may be provided in the second electrode portion 511c provided on the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B. Therefore, the second cover member 515 may be commonly connected to the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B and may jointly support the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B. Therefore, the second cover member 515 may protect the second surface or the second electrode portion 511c of each of the first vibration generating part 500A and the second vibration generating part 500B.

[0453] Each of the first cover member 513 and the second cover member 515 according to an exemplary embodiment of the present disclosure may include one or more materials selected from the group consisting of plastic, fiber, and wood, but the present disclosure is not limited thereto. For example, each of the first cover member 513 and the second cover member 515 may include the same material or different materials. For example, each of the first cover member 513 and the second cover member 515 may be a polyimide film or a polyethylene terephthalate film, but the present disclosure is not limited thereto.

[0454] The first cover member 513 according to the exemplary embodiment of the present disclosure can be provided on the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B through the first adhesive layer 512. For example, the first cover member 513 can be directly provided on the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B through a film lamination process using the first adhesive layer 512. Therefore, the first vibration generating part 500A and the second vibration generating part 500B can be integrated (or arranged) or tiled into the first cover member 513 to have a certain interval D1.

[0455] The second cover member 515 according to the exemplary embodiment of the present disclosure can be provided at the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B by using the second adhesive layer 514. For example, the second cover member 515 can be directly provided at the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B by a film lamination process using the second adhesive layer 514. Therefore, the first vibration generating part 500A and the second vibration generating part 500B can be integrated (or arranged) or tiled into the second cover member 515 to have a certain interval D1.

[0456] The first adhesive layer 512 may be provided between the first vibration generating part 500A and the second vibration generating part 500B and at the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B. For example, the first adhesive layer 512 may be formed on the rear surface (or inner surface) of the first cover member 513 facing the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B, may be filled between the first vibration generating part 500A and the second vibration generating part 500B, and may be provided between the first cover member 513 and the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B.

[0457] The second adhesive layer 514 may be provided between the first vibration generating part 500A and the second vibration generating part 500B and at the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B. For example, the second adhesive layer 514 may be formed on the front surface (or inner surface) of the second cover member 515 facing the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B, may be filled between the first vibration generating part 500A and the second vibration generating part 500B, and may be provided between the second cover member 515 and the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B.

[0458] The first adhesive layer 512 and the second adhesive layer 514 may be connected to each other between the first vibration generating part 500A and the second vibration generating part 500B. Thus, each of the first vibration generating part 500A and the second vibration generating part 500B may be surrounded by the first adhesive layer 512 and the second adhesive layer 514. For example, the first adhesive layer 512 and the second adhesive layer 514 may be constructed between the first cover member 513 and the second cover member 515 to completely or entirely surround the first vibration generating part 500A and the second vibration generating part 500B, respectively. For example, each of the first vibration generating part 500A and the second vibration generating part 500B may be buried or embedded between the first adhesive layer 512 and the second adhesive layer 514.

[0459] Each of the first adhesive layer 512 and the second adhesive layer 514 according to an exemplary embodiment of the present disclosure may include an electrically insulating material having adhesive properties and capable of compression and decompression. For example, each of the first adhesive layer 512 and the second adhesive layer 514 may include epoxy resin, acrylic resin, silicone resin, or polyurethane resin, but the embodiments of the present disclosure are not limited thereto. For example, each of the first adhesive layer 512 and the second adhesive layer 514 may be transparent, translucent, or opaque.

[0460] The vibration device 500 according to another exemplary embodiment of the present disclosure may further include a first power line PL1 provided in the first cover member 513 , a second power line PL2 provided in the second cover member 515 , and a pad portion 517 electrically connected to the first and second power lines PL1 and PL2 .

[0461] The first power line PL1 can be provided at the rear surface of the first cover member 513 facing the first surface of each of the first vibration generating part 500A and the second vibration generating part 500B. The first power line PL1 can be electrically connected to the first electrode portion 511b of each of the first vibration generating part 500A and the second vibration generating part 500B. For example, the first power line PL1 can be directly electrically connected to the first electrode portion 511b of each of the first vibration generating part 500A and the second vibration generating part 500B. In an exemplary embodiment of the present disclosure, the first power line PL1 can be electrically connected to the first electrode portion 511b of each of the first vibration generating part 500A and the second vibration generating part 500B through an anisotropic conductive film. In another exemplary embodiment of the present disclosure, the first power line PL1 can be electrically connected to the first electrode portion 511b of each of the first vibration generating part 500A and the second vibration generating part 500B through a conductive material (or particles) included in the first adhesive layer 512.

[0462] The first power line PL1 according to an exemplary embodiment of the present disclosure may include a first upper power line PL11 and a second upper power line PL12 arranged in the second direction Y. For example, the first upper power line PL11 may be electrically connected to the first electrode portion 511 b of the first vibration generating part 500A. The second upper power line PL12 may be electrically connected to the first electrode portion 511 b of the second vibration generating part 500B.

[0463] The second power line PL2 may be provided at a front surface of the second cover member 515 facing the second surface of each of the first vibration generating part 500A and the second vibration generating part 500B. The second power line PL2 may be electrically connected to the second electrode portion 511c of each of the first vibration generating part 500A and the second vibration generating part 500B. For example, the second power line PL2 may be directly electrically connected to the second electrode portion 511c of each of the first vibration generating part 500A and the second vibration generating part 500B. In an exemplary embodiment of the present disclosure, the second power line PL2 may be electrically connected to the second electrode portion 511c of each of the first vibration generating part 500A and the second vibration generating part 500B via an anisotropic conductive film. In another exemplary embodiment of the present disclosure, the second power line PL2 may be electrically connected to the second electrode portion 511c of each of the first vibration generating part 500A and the second vibration generating part 500B via a conductive material (or particles) included in the second adhesive layer 514.

[0464] The second power lines PL2 according to the embodiment may include a first lower power line PL21 and a second lower power line PL22 arranged in the second direction Y. For example, the first lower power line PL21 may be electrically connected to the second electrode portion 511c of the first vibration generating part 500A. For example, the first lower power line PL21 may overlap with the first upper power line PL11. The second lower power line PL22 may be electrically connected to the second electrode portion 511c of the second vibration generating part 500B. For example, the second lower power line PL22 may overlap with the second upper power line PL12.

[0465] The pad portion 517 may be configured at one edge portion (or one peripheral portion) of one of the first cover member 513 and the second cover member 515 so as to be electrically connected to one side or one end of the first and second power lines PL1 and PL2 .

[0466] The pad portion 517 according to an exemplary embodiment of the present disclosure may include a first pad electrode electrically connected to one end (or one portion) of the first power line PL1 and a second pad electrode electrically connected to one end (or one portion) of the second power line PL2.

[0467] The first pad electrode may be commonly connected to one end (or a portion) of the first upper power line PL11 and the second upper power line PL12 of the first power line PL1. For example, one end (or a portion) of each of the first upper power line PL11 and the second upper power line PL12 may branch off from the first pad electrode. The second pad electrode may be commonly connected to one end (or a portion) of the first lower power line PL21 and the second lower power line PL22 of the second power line PL2. For example, one end (or a portion) of each of the first lower power line PL21 and the second lower power line PL22 may branch off from the second pad electrode.

[0468] The vibration device 500 according to another exemplary embodiment of the present disclosure may further include a signal cable (or a signal applying member or a signal providing member) 519 .

[0469] The signal cable 519 may be electrically connected to the pad portion 517 provided in the vibration device 500 and may supply a vibration drive signal (or a sound signal) provided from the sound processing circuit to the vibration device 500. The signal cable 519 according to an exemplary embodiment of the present disclosure may include a first terminal electrically connected to a first pad electrode of the pad portion 517 and a second terminal electrically connected to a second pad electrode of the pad portion 517. For example, the signal cable 519 may be configured as a flexible printed circuit cable, a flexible flat cable, a single-sided flexible printed circuit, a single-sided flexible PCB, a flexible multi-layer printed circuit, or a flexible multi-layer PCB, but embodiments of the present disclosure are not limited thereto.

[0470] The sound processing circuit can generate an AC (AC) vibration drive signal including a first vibration drive signal and a second vibration drive signal based on the sound data provided by the external sound data generating circuit portion. The first vibration drive signal can be one of a positive (+) vibration drive signal and a negative (-) vibration drive signal, and the second vibration drive signal can be one of a positive (+) vibration drive signal and a negative (-) vibration drive signal. For example, the first vibration drive signal can be supplied to the first electrode portion 511b of each of the first vibration generating part 500A and the second vibration generating part 500B through the first terminal of the signal cable 519, the first pad electrode of the pad portion 517 and the first power line PL1. The second vibration drive signal can be supplied to the second electrode portion 511c of each of the first vibration generating part 500A and the second vibration generating part 500B through the second terminal of the signal cable 519, the second pad electrode of the pad portion 517 and the second power line PL2.

[0471] As described above, the vibration device 500 according to another exemplary embodiment of the present disclosure may be used in the same manner as described above. Figures 7 to 12The vibration device 500 described above is implemented in the same thin film form, and therefore can be bent into a shape corresponding to the shape of the vibration member or the vibration object. The vibration member including various curved portions can vibrate easily, and the sound characteristics and / or sound pressure level characteristics in the low-pitched vocal range generated based on the vibration of the vibration member can be enhanced. In addition, the vibration device 500 according to another exemplary embodiment of the present disclosure may include a first vibration generating part 500A and a second vibration generating part 500B arranged (or tiled) at a certain interval D1 so as to be implemented as a single vibrator without being driven independently. Therefore, it can be driven as a large-area vibration body based on the single vibration of the first vibration generating part 500A and the second vibration generating part 500B.

[0472] The vibration device 500 according to an exemplary embodiment of the present disclosure may further include a pad 580 disposed at the rear surfaces of the first and second vibration generating parts 500A and 500B. For example, the pad 580 may be disposed at the central portion of the first and second vibration generating parts 500A and 500B.

[0473] Reference Figure 13B , the vibration device 500 according to an exemplary embodiment of the present disclosure may include a first vibration generating part 500A, a second vibration generating part 500B, a third vibration generating part 500C, and a fourth vibration generating part 500D.

[0474] The first vibration generating part 500A, the second vibration generating part 500B, the third vibration generating part 500C, and the fourth vibration generating part 500D may be spaced apart from each other and electrically disconnected (or insulated) in the first direction X and the second direction Y. Each of the first vibration generating part 500A and the second vibration generating part 500B and each of the third vibration generating part 500C and the fourth vibration generating part 500D may be spaced apart from each other and electrically disconnected (or insulated) in the first X direction.

[0475] For example, the first vibration generating part 500A and the second vibration generating part 500B may be arranged or tiled at a certain interval D1 in the first direction X, and the third vibration generating part 500C and the fourth vibration generating part 500D may be arranged or tiled at a certain interval D1 in the first direction X. For example, the first vibration generating part 500A and the second vibration generating part 500B may be arranged or tiled at a certain interval D2 in the first direction Y, and the third vibration generating part 500C and the fourth vibration generating part 500D may be arranged or tiled at a certain interval D2 in the first direction Y.

[0476] Therefore, the vibration device 500 in which the first vibration generating part 500A, the second vibration generating part 500B, the third vibration generating part 500C and the fourth vibration generating part 500D are tiled can be a vibration array, a vibration array part, a vibration module array part, a vibration array structure, a tiled vibration array, a tiled array module or a tiled vibration membrane.

[0477] The vibration device 500 according to the exemplary embodiment of the present specification may further include a pad 580 located on the rear surfaces of the first vibration generating part 500A, the second vibration generating part 500B, the third vibration generating part 500C, and the fourth vibration generating part 500D, and the fourth vibration generating part 500D. For example, the pad 580 may be provided in the center of the first vibration generating part 500A and the second vibration generating part 500B.

[0478] In addition to the structure of the vibration generating portion provided separately, because reference Figure 14 Along the description Figure 13B The cross-sectional view taken along line III-III' is Figure 13A The cross-sectional views have the same configuration (structure), Figure 13B The second vibration device 500 and the reference Figure 13A The described second vibration device 500 is substantially the same, and thus, like reference numerals refer to like elements and their repeated descriptions may be omitted for the sake of brevity.

[0479] Figure 15 is a perspective view of a vibration portion of a vibration device according to an exemplary embodiment of the present disclosure, and Figure 16 It is along Figure 15 A cross-sectional view taken along line IV-IV'.

[0480] refer to Figure 15 and Figure 16 , a vibration device 500 according to an exemplary embodiment of the present disclosure may include two or more vibration generators (eg, a first vibration generator and a second vibration generator) 540 and 570 that are stacked to be displaced (or vibrated or driven) in the same direction.

[0481] According to an exemplary embodiment of the present disclosure, the first vibration generator 540 may be connected to the rear surface of the display member 100 through a connection member 550 (or a first connection member) or disposed at the rear surface of the display member 100. The second vibration generator 570 may be disposed or attached to the first vibration generator 540 through the connection member 550 (or a third connection member).

[0482] According to an exemplary embodiment of the present disclosure, the connecting member 550 (or coupling member, intermediate member or bonding member) may include a material having an adhesive layer with good bonding force or adhesion. For example, the connecting member 550 may include a foam pad, double-sided tape, adhesive, etc., but the embodiments of the present disclosure are not limited thereto. For example, the adhesive layer of the connecting member 550 may include epoxy resin, acrylic, silicone resin or polyurethane, but the embodiments of the present disclosure are not limited thereto. For example, the adhesive layer of the connecting member 550 may include a polyurethane-based material, which relatively has higher ductility than acrylic-based materials. Therefore, the vibration loss caused by the displacement interference between the multiple vibration generators 540 and 570 can be minimized, or each of the multiple vibration generators 540 and 570 can be freely displaced.

[0483] According to another exemplary embodiment of the present disclosure, the connecting member 550 may include one or more of a heat-curing adhesive, a light-curing adhesive, and a thermal adhesive. For example, the connecting member 550 may include a thermal adhesive. The thermal adhesive may be a heat-activated type or a heat-curing type. For example, the connecting member 550 including the thermal adhesive may attach or couple two adjacent vibration generators 540 and 570 by heat and pressure. A plurality of vibration generators 540 and 570 according to an exemplary embodiment of the present disclosure may be integrated into a structure (or element or component) by a lamination process using the connecting member 550. For example, a plurality of vibration generators 540 and 570 may be integrated into a structure by a lamination process using a roller.

[0484] For example, the plurality of vibration generators 540 and 570 may be implemented so that the plurality of vibration generators 540 and 570 overlap or stack to have the same driving direction, and therefore, the driving force of each of the plurality of vibration generators 540 and 570 is the same. The vibration generators 540 and 570 may be increased or maximized to enhance one or more of the sound pressure level characteristics of the sound generated by the vibration member or plate 501 based on vibration and the sound characteristics of the mid-low pitch vocal cords. For example, the mid-low pitch vocal cords may be 200Hz to 1kHz, but embodiments of the present disclosure are not limited thereto. For example, the high pitch vocal cords may be 1kHz or greater or 3kHz or greater, but embodiments of the present disclosure are not limited thereto.

[0485] Each of the first vibration generator 540 and the second vibration generator 570 according to an exemplary embodiment of the present disclosure may include a plurality of vibration generating parts 500A and 500B. Each of the plurality of vibration generating parts 500A and 500B may include a vibration device, a first cover member 513 and a second cover member 515.

[0486] The vibration generating parts 500A and 500B (or vibration devices) according to the exemplary embodiment of the present disclosure may include a vibration part 511a, a first electrode part 511b provided at a first surface of the vibration part 511a, and a second electrode part 511c provided at a second surface of the vibration part 511a opposite to the first surface. The vibration part 511a may be configured to be substantially equal to the above reference Figure 9 、 Figure 10 、 Figure 11 and Figure 12 One of the vibration parts 511a is described, and therefore, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0487] The first electrode portion 511b may be provided at a first surface (or upper surface or front surface) of the vibration portion 511a. The second electrode portion 511c may be provided on a second surface (or rear surface) of the vibration portion 511a opposite to the first surface. The first electrode portion 511b and the second electrode portion 511c may be provided on the first surface (or upper surface or front surface) of the vibration portion 511a. Figure 7 and Figure 8 The description of the first electrode portion 511 b and the second electrode portion 511 c is substantially the same, and thus, the same reference numerals refer to the same elements and their repeated descriptions may be omitted for the sake of brevity.

[0488] In each of the first vibration generator 540 and the second vibration generator 570, the first electrode portion 511b may be disposed closer to the display member 100 than the second electrode portion 511c, but embodiments of the present disclosure are not limited thereto. For example, in the second vibration device 500 including the first vibration generator 540 and the second vibration generator 570 according to an exemplary embodiment of the present disclosure, the first electrode portion 511b of each of the first vibration generator 540 and the second vibration generator 570 may be disposed closer to the display member 100 than the second electrode portion 511c.

[0489] The vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can have the same size as the vibration device 511 (or the vibration part 511a) of the second vibration generator 570. In order to maximize or increase the displacement or amplitude displacement of the vibration device 500, the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can substantially overlap with the vibration device 511 (or the vibration part 511a) of the second vibration generator 570 without interleaving. For example, the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can substantially overlap with the vibration device 511 (or the vibration part 511a) of the second vibration generator 570 without interleaving within the tolerance range of the manufacturing process. For example, the vibration generating parts 500A and 500B (or vibration parts 511a) of the first vibration generator 540 and the vibration generating parts 500A and 500B (or vibration parts 511a) of the second vibration generator 570 can be implemented in a stacked structure that overlaps without being staggered and has the same size, and thus, the displacement amount or amplitude displacement of the vibration device 500 can be maximized or increased. For example, the vibration generating parts 500A and 500B (or vibration parts 511a) of the first vibration generator 540 and the vibration generating parts 500A and 500B (or vibration parts 511a) of the second vibration generator 570 can be implemented in a stacked structure that accurately overlaps without being staggered and has the same size, and thus, the displacement amount or amplitude displacement of the vibration device 500 can be maximized or increased.

[0490] According to an exemplary embodiment of the present disclosure, the first portion (end portion or outer surface or each edge portion or peripheral portion) 540a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can be aligned in a virtual extension line VL (or a vertical line or an overlapping line) or can be arranged in the virtual extension line VL. For example, the first portion (end portion or outer surface or each edge portion or peripheral portion) 540a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can be accurately aligned in the virtual extension line VL or can be accurately arranged in the virtual extension line VL. The second portion (end portion or outer surface or each edge portion or peripheral portion) 570a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the second vibration generator 570 can be aligned in the virtual extension line VL or can be arranged in the virtual extension line VL. For example, the second portion (end portion or outer surface or each edge portion or peripheral portion) 570a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the second vibration generator 570 can be accurately aligned in the virtual extension line VL or can be accurately arranged in the virtual extension line VL. The first portion 540a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can be aligned with or overlapped with the second portion 570a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the second vibration generator 570. For example, the first portion 540a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can be accurately aligned with or overlapped with the second portion 570a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the second vibration generator 570. For example, the first part 540a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the first vibration generator 540 can correspond to the second part 570a of each of the vibration generating parts 500A and 500B (or the vibration part 511a) of the second vibration generator 570. Therefore, in the vibration device according to the exemplary embodiment of the present disclosure, the vibration generating parts 500A and 500B (or the first vibration part) of the first vibration generator 540 and the vibration generating parts 500A and 500B (or the second vibration part) of the second vibration generator 570 can be displaced in the same direction, so the displacement amount or amplitude displacement can be maximized or increased. Therefore, the displacement amount (or bending force) or amplitude displacement of the display member 100 can be increased (or maximized).

[0491] In the first vibration generator 540, the first cover member 513 can be disposed on the first electrode portion 511b and can protect the first electrode portion 511b. The second cover member 515 can be disposed on the second electrode portion 511c. The second cover member 515 can protect the second electrode portion 511c. For example, each of the first cover member 513 and the second cover member 515 of the first vibration generator 540 can include a plastic material, a fiber material, or a wood material, but the embodiments of the present disclosure are not limited thereto. For example, in the first vibration generator 540, the first cover member 513 can include a material that is the same as or different from that of the second cover member 515. One or more of the first cover member 513 and the second cover member 515 of the first vibration generator 540 can be connected or coupled to the rear surface of the display member 100 via a connecting member 550 (or a third connecting member). For example, the first cover member 513 of the first vibration generator 540 can be connected or coupled to the rear surface of the display member 100 via a connecting member 550 (or a third connecting member).

[0492] In the second vibration generator 570, the first cover member 513 may be disposed on the first electrode portion 511b. The first cover member 513 may protect the first electrode portion 511b. The second cover member 515 may be disposed on the second electrode portion 511c. The second cover member 515 may protect the second electrode portion 511c. For example, each of the first cover member 513 and the second cover member 515 of the second vibration generator 570 may include a plastic material, a fiber material, or a wood material, but embodiments of the present disclosure are not limited thereto. For example, in the second vibration generator 570, the first cover member 513 may include a material that is the same as or different from that of the second cover member 515. One or more of the first cover member 513 and the second cover member 515 of the second vibration generator 570 may be connected or coupled to the rear surface of the first vibration generator 540 using a connecting member 550 (or a third connecting member). For example, the first cover member 513 of the second vibration generator 570 may be connected or coupled to the second cover member 515 of the first vibration generator 540 via the connecting member 550 (or a third connecting member).

[0493] In each of the first vibration generator 540 and the second vibration generator 570, each of the first cover member 513 and the second cover member 515 may include a plastic material. For example, each of the first cover member 513 and the second cover member 515 may be a polyimide film or a polyethylene terephthalate film, but the embodiments of the present disclosure are not limited thereto.

[0494] One or more of the first vibration generator 540 and the second vibration generator 570 according to the exemplary embodiment of the present disclosure may further include a first adhesive layer 512 and a second adhesive layer 514 .

[0495] refer to Figure 16 In the first vibration generator 540, a first adhesive layer 512 may be provided between the vibration generating parts 500A and 500B and the first cover member 513. For example, the first adhesive layer 512 may be provided between the first electrode portion 511b of each of the vibration generating parts 500A and 500B and the first cover member 513. The first cover member 513 may be provided on the first surface of the vibration part 511a (or the first electrode portion 511b) through the first adhesive layer 512. For example, the first cover member 513 may be coupled or connected to the first surface of the vibration part 511a (or the first electrode portion 511b) through a lamination process using the first adhesive layer 512.

[0496] In the first vibration generator 540, the second adhesive layer 514 may be provided between the vibration generating parts 500A and 500B and the second cover member 515. For example, the second adhesive layer 514 may be provided between the second electrode portion 511 c of each of the vibration generating parts 500A and 500B and the second cover member 515. For example, the second protective member (second cover member) 515 may be coupled or connected to the second surface of the vibration part 511 a (or the second electrode portion 511 c) using the second adhesive layer 514 through a lamination process.

[0497] In the first vibration generator 540, the first adhesive layer 512 and the second adhesive layer 514 may be connected or coupled to each other between the first cover member 513 and the second cover member 515. For example, in the first vibration generator 540, the first adhesive layer 512 and the second adhesive layer 514 may be connected or coupled to each other at an edge portion (or peripheral portion) between the first cover member 513 and the second cover member 515. Therefore, in the first vibration generator 540, the vibration generating parts 500A and 500B may be surrounded by the first adhesive layer 512 and the second adhesive layer 514. For example, the first adhesive layer 512 and the second adhesive layer 514 may be completely or entirely surrounded by all the vibration generating parts 500A and 500B of the first vibration generator 540. For example, the first adhesive layer 512 and the second adhesive layer 514 may be provided as one adhesive layer.

[0498] In the second vibration generator 570, a first adhesive layer 512 may be provided between the vibration generating parts 500A and 500B and the first cover member 513. For example, the first adhesive layer 512 may be provided between the first electrode portion 511b of each of the vibration generating parts 500A and 500B and the first cover member 513. The first cover member 513 may be provided on the first surface (or first electrode portion 511b) of the vibration portion 511a through the first adhesive layer 512. For example, the first cover member 513 may be coupled or connected to the first surface (or first electrode portion 511b) of each of the vibration generating parts 500A and 500B through a lamination process using the first adhesive layer 512.

[0499] In the second vibration generator 570, a second adhesive layer 514 may be provided between the vibration generating parts 500A and 500B and the second cover member 515. For example, the second adhesive layer 514 may be provided between the second electrode portion 511c of each of the vibration generating parts 500A and 500B and the second cover member 515. The second cover member 515 may be provided on the second surface (or the second electrode portion 511c) of each of the vibration generating parts 500A and 500B through the second adhesive layer 514. For example, the second cover member 515 may be coupled or connected to the second surface (or the second electrode portion 511c) of each of the vibration generating parts 500A and 500B through a lamination process using the second adhesive layer 514.

[0500] In the second vibration generator 570, the first adhesive layer 512 and the second adhesive layer 514 may be connected or coupled to each other between the first cover member 513 and the second cover member 515. For example, in the second vibration generator 570, the first adhesive layer 512 and the second adhesive layer 514 may be connected or coupled to each other at an edge portion (or peripheral portion) between the first cover member 513 and the second cover member 515. Therefore, in the second vibration generator 570, the vibration generating parts 500A and 500B may be surrounded by the first adhesive layer 512 and the second adhesive layer 514. For example, the first adhesive layer 512 and the second adhesive layer 514 may completely or entirely surround all the vibration generating parts 500A and 500B of the second vibration generator 570. For example, the first adhesive layer 512 and the second adhesive layer 514 may be provided as one adhesive layer.

[0501] In each of the first vibration generator 540 and the second vibration generator 570, each of the first adhesive layer 512 and the second adhesive layer 514 may include an electrically insulating material. For example, the electrically insulating material may include a material having adhesive properties and capable of compression and decompression. For example, one or more of the first adhesive layer 512 and the second adhesive layer 514 may include epoxy resin, acrylic resin, silicone resin, or polyurethane resin, but embodiments of the present disclosure are not limited thereto.

[0502] Figure 17 is a perspective view of a vibration portion of a vibration device according to an exemplary embodiment of the present disclosure.

[0503] refer to Figure 17 According to an exemplary embodiment of the present disclosure, the vibration portion 511a may include a plurality of first portions 511a1 and a plurality of second portions 511a2. For example, the plurality of first portions 511a1 and the plurality of second portions 511a2 may be arranged alternately and repeatedly in the second direction Y (or the first direction X). For example, the first direction X may be the width direction of the vibration portion 511a, and the second direction Y may be the length direction of the vibration portion 511a intersecting the first direction X, but the embodiments of the present disclosure are not limited thereto. For example, the first direction X may be the length direction of the vibration portion 511a, and the second direction Y may be the width direction of the vibration portion 511a. For example, the first portion 511a1 may be a piezoelectric portion, a piezoelectric element, an inorganic portion, an inorganic material portion, a piezoelectric layer, a vibration layer, a displacement layer, or a displacement element, but the terms are not limited thereto. For example, the second portion 511a2 may be an extension portion, an elastic portion, an extendable portion, an organic portion, an organic material portion, a damping portion, a bending portion, or a bouncing portion, but the terms are not limited thereto.

[0504] Each of the plurality of first portions 511a1 may include an inorganic material portion. For example, the inorganic material portion may include the aforementioned materials. Each of the plurality of second portions 511a2 may include an organic material portion. For example, the organic material portion may include the aforementioned materials.

[0505] Each of the plurality of first portions 511a1 according to an exemplary embodiment of the present disclosure may be disposed between the plurality of second portions 511a2. The plurality of first portions 511a1 and the plurality of second portions 511a2 may be the same as those described above. Figure 9 The described plurality of first portions 511a1 and the plurality of second portions 511a2 are substantially the same, and thus, their repeated description may be omitted for the sake of brevity.

[0506] The vibration device 511 of the first vibration generator 540 and the vibration device 511 of the second vibration generator 570 can be of the same size and can overlap to maximize or increase the displacement or amplitude displacement of the second vibration device 500. For example, the first portion (end or outer surface or each edge portion or peripheral portion) 540a of the vibration device 511 (or vibration portion 511a) of the first vibration generator 540 can be aligned with or overlap the second portion (end or outer surface or each edge portion or peripheral portion) 570a of the vibration device 511 (or vibration portion 511a) of the second vibration generator 570. For example, the first portion (end or outer surface or each edge portion or peripheral portion) 540a of the vibration device 511 (or vibration portion 511a) of the first vibration generator 540 can be aligned with or overlap the second portion (end or outer surface or each edge portion or peripheral portion) 570a of the vibration device 511 (or vibration portion 511a) of the second vibration generator 570 within a tolerance range during the manufacturing process without being staggered. For example, the first portion (end portion or outer surface or each edge portion or peripheral portion) 540a of the vibration device 511 (or the vibration portion 511a) of the first vibration generator 540 can be aligned in the virtual first extension line VL1 or can be arranged in the virtual first extension line VL1. The first portion (end portion or outer surface or each edge portion or peripheral portion) 540a of the vibration device 511 (or the vibration portion 511a) of the first vibration generator 540 can be accurately aligned in the virtual first extension line VL1 or can be accurately arranged in the virtual first extension line VL1. The second portion (end portion or outer surface or each edge portion or peripheral portion) 570a of the vibration device 511 (or the vibration portion 511a) of the second vibration generator 570 can be aligned in the virtual first extension line VL1 or can be arranged in the virtual first extension line VL1. For example, the second portion (end or outer surface or each edge portion or peripheral portion) 570a of the vibration device 511 (or vibration portion 511a) of the second vibration generator 570 can be accurately aligned in the virtual first extension line VL1 or can be accurately set in the virtual first extension line VL1.

[0507] According to an exemplary embodiment of the present disclosure, the plurality of first portions 511a1 of the first vibration generator 540 and the plurality of first portions 511a1 of the second vibration generator 570 may have the same size or may substantially overlap. For example, the plurality of first portions 511a1 of the first vibration generator 540 and the plurality of first portions 511a1 of the second vibration generator 570 may have the same size or may substantially overlap without being staggered. According to an exemplary embodiment of the present disclosure, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of first portions 511a1 of the first vibration generator 540 may substantially overlap with the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of first portions 511a1 of the second vibration generator 570. For example, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of first portions 511a1 of the first vibration generator 540 may substantially overlap, without being staggered, with the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of first portions 511a1 of the second vibration generator 570. For example, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of first portions 511a1 of the first vibration generator 540 and the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of first portions 511a1 of the second vibration generator 570 may be aligned in the second extension line VL2 or may be disposed in the second extension line VL2. For example, the first part (the end or outer surface or each edge part or peripheral part) of each of the multiple first parts 511a1 of the first vibration generator 540 and the first part (the end or outer surface or each edge part or peripheral part) of each of the multiple first parts 511a1 of the second vibration generator 570 can be accurately aligned in the second extension line VL2 or can be accurately set in the second extension line VL2.

[0508] According to an exemplary embodiment of the present disclosure, the plurality of second portions 511a2 of the first vibration generator 540 and the plurality of second portions 511a2 of the second vibration generator 570 may have the same size or may substantially overlap. For example, the plurality of second portions 511a2 of the first vibration generator 540 and the plurality of second portions 511a2 of the second vibration generator 570 may have the same size or may substantially overlap without interleaving. According to an exemplary embodiment of the present disclosure, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the first vibration generator 540 may substantially overlap with the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the second vibration generator 570 without interleaving. For example, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the first vibration generator 540 may substantially overlap with, without interleaving, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the second vibration generator 570. For example, the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the first vibration generator 540 and the first portion (end portion or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the second vibration generator 570 may be aligned in the second extension line VL2 or may be disposed in the second extension line VL2. For example, the first portion (end or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the first vibration generator 540 and the first portion (end or outer surface or each edge portion or peripheral portion) of each of the plurality of second portions 511a2 of the second vibration generator 570 can be accurately aligned in the second extension line VL2 or can be accurately arranged in the second extension line VL2. Therefore, in the second vibration device 500 according to the exemplary embodiment of the present disclosure, the vibration portion 511a of the first vibration generator 540 and the vibration portion 511a of the second vibration generator 570 can be displaced (or vibrated or driven) in the same direction, and thus, the displacement amount or amplitude displacement can be maximized or increased. Therefore, the displacement amount (or bending force) or amplitude displacement of the display member 100 can be increased (or maximized).

[0509] exist Figure 17In the related description, the vibration device 500 according to another exemplary embodiment of the present disclosure is described as including a first vibration generator 540 and a second vibration generator 570, but the embodiments of the present disclosure are not limited thereto. For example, the vibration device 500 according to another exemplary embodiment of the present disclosure may include a plurality of (e.g., three or more) vibration generators 540 and 570. Even in this case, in order to maximize or increase the displacement or amplitude displacement of the vibration device 500, the plurality of vibration generators 540 and 570 may have the same size and may overlap. According to an exemplary embodiment of the present disclosure, the first portion 511a1 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may substantially overlap. For example, the first portion 511a1 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may substantially overlap without being staggered. For example, the first portion 511a1 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may be aligned in the virtual extension line VL or may be disposed in the virtual extension line VL. For example, the first portion 511a1 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the first portion 511a1 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may be accurately aligned in the virtual extension line VL or may be accurately disposed in the virtual extension line VL. In addition, the second portion 511a2 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the second portion 511a2 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may substantially overlap. For example, the second portion 511a2 of the vibration generator 540 disposed in the upper layer (or top layer) among three or more vibration generators 540 and 570 and the second portion 511a2 of the vibration generator 570 disposed in the lower layer (or bottom layer) among three or more vibration generators 540 and 570 may substantially overlap without being staggered.For example, the second portion 511a2 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the second portion 511a2 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may be aligned in the virtual extension line VL or may be disposed in the virtual extension line VL. For example, the second portion 511a2 of the vibration generator 540 disposed in the upper layer (or top layer) among the three or more vibration generators 540 and 570 and the second portion 511a2 of the vibration generator 570 disposed in the lower layer (or bottom layer) among the three or more vibration generators 540 and 570 may be accurately aligned in the virtual extension line VL or may be accurately disposed in the virtual extension line VL.

[0510] Figure 18 、 Figure 19 and Figure 20 is a perspective view of a vibration portion of a vibration device according to one or more exemplary embodiments of the present disclosure. Figure 18 、 Figure 19 and Figure 20 The vibration part 511a of the prepared vibration device 500 may be Figures 10 to 12 The vibration device 500 illustrated or similar to the illustrated one is constructed with two vibration generators and by modifying Figure 17 The exemplary embodiment is realized by the shape of the vibration part 511a of the vibration device 500. Figure 18 、 Figure 19 and Figure 20 The description is different from the previous description (e.g. Figures 10 to 12 ) are substantially the same or similar and, therefore, may be omitted for the sake of brevity.

[0511] Figure 21 is a graph illustrating sound pressure level characteristics of a device according to an exemplary embodiment of the present disclosure.

[0512] Sound output characteristics can be measured using a sound analysis device. For sound pressure measurement, a commercially available device, the AudioPrecision APX525, was used. The input voltage was set to 10 Vrms and converted to an EQ (equalizer). The signal from the second vibration device 500 was amplified within the range of 10 Hz to 40 kHz, subjected to a sinusoidal sweep, and the average sound pressure was measured using a microphone at a distance of 0.5 m from the vibrating body. The measured sound pressure was then smoothed to a 1 / 3 octave band, and the sound pressure was measured in a semi-anechoic chamber. The sound analysis device can include a sound card that transmits and receives sound to and from a controlling personal computer (PC), an amplifier that amplifies the signal generated by the sound card and transfers the amplified signal to the vibration device, and a microphone in the display panel that collects the sound generated by the vibration device. For example, the microphone can be positioned in the center of the vibration device, and the distance between the display panel and the microphone can be approximately 50 cm. Sound measurements can be made with the microphone perpendicular to the vibration device. The sound collected by the microphone can be input to the controlling PC via the sound card, and the sound from the vibration device can be analyzed using a control program. For example, the frequency response characteristics of the frequency range of 20 Hz to 20 kHz can be measured by using a pulse program. Figure 21 , the horizontal axis represents frequency (Hz: Hertz), and the vertical axis represents sound pressure level (SPL) (dB: decibel).

[0513] refer to Figure 2C 、 Figure 5A 、 Figure 5B and Figure 21 As well as other related drawings, in the device according to the exemplary embodiment of the present disclosure, the first vibration device 400 can be arranged in the sixth area, the seventh area, the tenth area, and the eleventh area of ​​the back cover 300 based on the natural frequency mode shape of the light guide plate 131, thereby ensuring the low-pitched sound performance of the sound. In addition, in the device according to the exemplary embodiment of the present disclosure, the plate 501 (connected to the second vibration device 500) including a material with excellent high-pitched sound transmission performance can be arranged at the corner of the back cover 300, thereby maximizing the vibration transmission efficiency and / or vibration transmission characteristics of the second vibration device 500 with high-pitched sound performance, thereby enhancing the sound pressure level characteristics in the frequency band of 100 Hz to 40 kHz.

[0514] Figure 22 It shows that based on Figure 2A Examples of graphs of sound pressure level characteristics of a first vibration device, a second vibration device, and an apparatus are provided.

[0515] The measurement method for sound output characteristics can be the same as that referenced above. Figure 21 The details of the description are the same and therefore, for the sake of brevity, may be omitted. Figure 22 , the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (SPL) (dB).

[0516] Figure 22 The thick solid line in the Figure 2A The sound output characteristics of the first vibration device 400 in the sixth area 6 of the device are shown in FIG. Figure 2A The sound output characteristics of the second vibration device 500 in the first area 1 of the device are shown in FIG. Figure 2A The sound output characteristics of the device.

[0517] refer to Figure 22 When the first vibration device 400 is placed in the sixth area 6, it was confirmed that the sound output characteristics of the high-pitched vocal range were not sufficiently maintained. Furthermore, when the second vibration device 500 is placed in the first area 1, it was confirmed that the sound output characteristics of the mid- and low-pitched vocal ranges were not sufficiently maintained. Furthermore, when the first vibration device 400 and the second vibration device 500 are placed simultaneously, it was confirmed that a sound output characteristic of approximately 70 dB is maintained at a frequency of approximately 100 Hz, and a sound output characteristic of approximately 70 dB is maintained at frequencies of 3 kHz to 40 kHz, representing the high-pitched vocal range. In this case, a sound output characteristic of approximately 70 dB can serve as a reference value or tuning target value for ensuring sound output characteristics within the frequency ranges of 100 Hz to 20 kHz or 100 Hz to 40 kHz.

[0518] Figure 23A is a photograph of a device according to an example embodiment of the present disclosure.

[0519] Reference Figure 23A , the device according to the exemplary embodiment of the present disclosure may include a pair of first vibration devices 400 and a pair of second vibration devices 500 provided at the back cover portion 310. The first vibration device 400 is provided between the sixth area 6 and the seventh area 7, and the second vibration device 500 is provided in the first area 1, as described above with reference to Figure 2C As stated.

[0520] Figure 23B An example of a vibration device at a rear cover of a device according to an exemplary embodiment of the present disclosure is illustrated.

[0521] refer to Figure 23BIn a display device for close viewing, the user's audible position may be close to it, so in this example, the distance between the first vibration device 400 and the second vibration device 500 may be important. The position identification of speech or sound can be performed at half the wavelength (1 / 2). Here, high-pitched sounds can be sent and transmitted by the display member 100 and can be radiated (corner part) by the mechanism or structure of the device 10. Therefore, the high-pitched sound radiation center point can be set at the corner end (or corner part) of the display member 100 or device 10 and the distance between the corner end (or corner part) of the device 10 and the first vibration device 400 can be an important factor for determining the position of the sound. The natural human voice band can be about 8kHz and it is necessary to identify the radiation of speech occurring in the screen. Therefore, the radiation of speech should be half (1 / 2) of the 428mm wavelength of 8kHz sound. The sound wavelength can represent the distance of each cycle of the sound wave.

[0522] The length from the center point of the first vibration device 400 to the adjacent corner in the second direction Y can be defined as L b , the length to the adjacent corner in the first direction X can be defined as L a The length from the center point of the second vibration device 500 to the adjacent corner in the second direction Y can be defined as L d , and the length to the adjacent corner in the first direction X can be defined as L c Based on the length L of the first vibration device 400 and the second vibration device 500 defined in this manner a , L b , L c and L d When the calculated value of the following equation 1 is calculated, for example, the calculated value may be approximately half (1 / 2) of 428 mm, which is the wavelength of sound at 8 kHz, and therefore, it may be recognized that radiation of voice occurs in the screen.

[0523] [Equation 1]

[0524]

[0525] Figure 23B The cross-sectional structure of the indicated portion of region B may have the same structure as that of the above referenced portions. Figure 5A and Figure 5B The apparatus described includes the first vibration device 400 and the second vibration device 500 having the same structure.

[0526] Figure 24 is an example showing simulated photographs each showing the resonance characteristics of the light guide plate of the first vibration device according to one or more exemplary embodiments of the present disclosure. Figure 24 In FIG, the resonant frequency at the lower region of each photograph is shown.

[0527] refer to Figure 24 , at the resonant frequency of the first vibration device 400, amplification of the light guide plate 131 (130) has been observed at a resonant frequency of 109.8 Hz or 116.8 Hz, and it has been observed that an unwanted resonance peak is limited by approaching an anti-resonance node at a resonant frequency of 141.9 Hz or 156.8 Hz. An anti-resonance node refers to a maximum amplitude region between two adjacent nodes in a standing wave.

[0528] Figure 25A is a schematic diagram of the first vibration device, the back cover and the light guide plate of the present disclosure, Figure 25B is a schematic diagram of an example of a position change of the first vibration device of the present disclosure at the back cover, and Figure 26 It shows that Figure 25B An example of a graph of sound pressure level characteristics measured under the conditions of Figure 25A and Figure 25B In the present invention, the variation trend of the acoustic characteristics of the secondary vibration of the light guide plate 131 (130) has been confirmed by harmonic acoustic coupling analysis based on the relative position of the first vibration device 400 in the rear cover 300 (for example, upward and downward movement). Figure 26 In the figures, when the supporting member (e.g., the back cover) is assumed to be rigid, the changes in the sound pressure level SPL caused by the vibration of the light guide plate 131 (130) based on the movement of the vibration position have been compared by modeling the internal air and the front air (Case I - solid line, Case II - dotted line, and Case III - solid line).

[0529] exist Figure 26 , the horizontal axis represents frequency (Hz), the vertical axis represents pressure level (Pa), and the pressure level can be substituted into the sound pressure level using a specific equation.

[0530] refer to Figure 25A 、 Figure 25B and Figure 26 , it can be seen that Case I is a case where the first vibration device 400 is located at a relatively upper position and low-pitched sounds between 200 Hz and 300 Hz increase compared to Cases II and III. With reference to this, it can be seen that as the first vibration device 400 moves to the lower right or lower end of the rear cover 300, its frequency moves to a relatively higher frequency.

[0531] Figure 27A 、 Figure 27B 、 Figure 27C and Figure 27D The vibration device at the back cover of the device according to one or more exemplary embodiments of the present disclosure is illustrated. Figures 27A to 27DThe display module or back cover 300 may include a left area LA and a right area RA that are symmetrical with respect to a horizontal direction, and each of the left area LA and the right area RA may be divided into 16 equal parts, which may be defined as first to sixteenth areas 1-16.

[0532] Based on Figure 27A The equipment provided is based on Figure 2A Compared to the device provided, except that the first sound generating device 410 and the second sound generating device 430 of the first vibration device 400 are arranged between the ninth area 9 and the tenth area 10, and the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 of the second vibration device 500 are arranged in the fifth area 5, Figure 27A The equipment can be compared with the above reference Figures 2A to 2C The described apparatus 10 is substantially identical, and therefore, like reference numerals refer to like elements and their repeated description may be omitted for the sake of brevity.

[0533] Based on Figure 27B The equipment provided is based on Figure 2A Compared to the device provided, except that the first sound generating device 410 and the second sound generating device 430 of the first vibration device 400 are arranged between the sixth area 6 and the seventh area 7 and the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 of the second vibration device 500 are arranged in the fifth area 5, Figure 27A The equipment can be compared with the above reference Figure 2A The described apparatus 10 is substantially identical, and therefore, like reference numerals refer to like elements and their repeated description may be omitted for the sake of brevity.

[0534] Based on Figure 27C The equipment provided is based on Figure 2A Compared to the device provided, except that the first sound generating device 410 and the second sound generating device 430 of the first vibration device 400 are arranged between the fifth area 5 and the sixth area 6 and the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 of the second vibration device 500 are arranged in the ninth area 9, Figure 27C The equipment can be compared with the above reference Figures 2A to 2C The described apparatus 10 is substantially identical, and therefore, like reference numerals refer to like elements and their repeated description may be omitted for the sake of brevity.

[0535] Based on Figure 27D The equipment provided is based on Figure 2ACompared to the device provided, except that the first sound generating device 410 and the second sound generating device 430 of the first vibration device 400 are arranged between the tenth area 10 and the eleventh area 11 and the first piezoelectric vibration device 510 and the second piezoelectric vibration device 530 of the second vibration device 500 are arranged in the ninth area 9, Figure 27D The equipment can be compared with the above reference Figures 2A to 2C The described apparatus 10 is substantially identical, and therefore, like reference numerals refer to like elements and their repeated description may be omitted for the sake of brevity.

[0536] Figure 28 It shows Figure 27A 、 Figure 27B 、 Figure 27C and Figure 27D An example of a graph of the sound pressure level characteristics of a device is shown in Table 1. Figure 28 Example of the results.

[0537] The measurement method for sound output characteristics can be the same as that referenced above. Figure 21 The details of the description are the same and therefore, for the sake of brevity, may be omitted. Figure 28 , the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (SPL) (dB).

[0538] [Table 1]

[0539] equipment- Figure 27A equipment- Figure 27B equipment- Figure 27C equipment- Figure 27D SPL(@100Hz) 62.7dB 65.5dB 57.0dB 58.1dB △SPL -2.8dB (refer to) -8.5dB -7.4dB Frequency (@65dB) 145Hz 98Hz 127Hz 113Hz △Frequency 50Hz (refer to) 29Hz 15Hz

[0540] exist Figure 28 The thick solid line indicates Figure 27A The single-dot chain line indicates the sound output characteristics of the device. Figure 27B The thin solid line represents the sound output characteristics of the device. Figure 27C The dotted line represents the sound output characteristics of the device. Figure 27D The sound output characteristics of the device.

[0541] refer to Figure 28 , compared with the sound pressure characteristics at 100Hz, Figure 27B The highest sound pressure level of 65.5dB was measured in the equipment Figure 27A The sound pressure level of 62.7dB was measured in the equipment. Figure 27C A sound pressure level of 57.0 dB was measured in the device and has been Figure 27D A sound pressure level of 58.1dB was measured in the device. Figure 27A The sound pressure level of the equipment at 100Hz is Figure 27B The sound pressure level of the device at 100Hz is 2.8dB lower, and Figure 27C The sound pressure level of the equipment at 100Hz is Figure 27BThe sound pressure level of the device at 100Hz is 8.5dB lower, and Figure 27C The sound pressure level of the equipment at 100Hz is Figure 27B The sound pressure level of the device at 100Hz is 7.4dB lower. Therefore, it can be seen that the low-pitched sound characteristics are Figure 27B The highest among all devices.

[0542] Compared to the frequency measured at 65dB, Figure 27B A frequency of 98 Hz was observed in the lowest sound in the device, which has been Figure 27D A frequency of 113 Hz has been observed in devices that have Figure 27C A frequency of 127 Hz has been observed in devices with Figure 27A A frequency of 148 Hz was observed in the device.

[0543] Figure 29 An example of a piezoelectric device of the second vibration device is illustrated, and Figure 30A and Figure 30B It is along Figure 29 An example of a cross-sectional view taken along line V-V'. Figure 29 The piezoelectric device is an exemplary embodiment implemented by stacking twenty vibration sections.

[0544] refer to Figure 29 、 Figure 30A and Figure 30B The vibration device (or piezoelectric device) 511 of the second vibration device 500 can be constructed as a single layer or multiple layers. According to an exemplary embodiment of the present disclosure, the vibration device 511 of the second vibration device 500 can be constructed as a single layer or multiple layers, and at least a portion thereof can be constructed as a dummy layer. The dummy layer can be provided at the center portion of the multiple layers, but the embodiments of the present disclosure are not limited thereto.

[0545] The vibration device 511 according to an exemplary embodiment of the present disclosure may have a third length L3 parallel to the first direction X and a fourth length L4 parallel to the second direction Y. For example, the third length L3 of the vibration device 511 may be shorter than the fourth length L4, but embodiments of the present disclosure are not limited thereto. For example, the third length L3 may be longer than or equal to the fourth length L4.

[0546] The vibration device 511 according to an exemplary embodiment of the present disclosure may include a vibration portion 511a, a first electrode portion 511b, and a second electrode portion 511c, and for example, the first electrode portion 511b and the second electrode portion 511c may be disposed to be engaged with each other and may be disposed to be opposite to each other.

[0547] For example, the first electrode portion 511b may be disposed at a first surface (or upper surface) of the vibration portion 511a and may be electrically connected to the first surface of the vibration portion 511a. The second electrode portion 511c may be disposed at a second surface (or rear surface) of the vibration portion 511a opposite to the first surface and may be electrically connected to the second surface of the vibration device 511. For example, the first electrode portion 511b and the second electrode portion 511c may be disposed with the vibration portion 511a therebetween. For example, the first electrode portion 511b and the second electrode portion 511c may include the same material, but embodiments of the present disclosure are not limited thereto. In another exemplary embodiment of the present disclosure, the first electrode portion 511b and the second electrode portion 511c may include different materials.

[0548] According to an exemplary embodiment of the present disclosure, one or more of the first electrode portion 511b and the second electrode portion 511c may include 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 may include indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiments of the present disclosure are not limited thereto. For example, the opaque conductive material may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), platinum (Pt), molybdenum (Mo), magnesium (Mg), or an alloy thereof, but the embodiments of the present disclosure are not limited thereto.

[0549] refer to Figure 30A and Figure 30B , the vibration device (or piezoelectric device) 511 of the second vibration device 500 can be implemented as a multi-layer or multi-layer. The vibration device 511 can be implemented as a polycrystalline type. For example, referring to Figure 30A For example, the vibration device 511 may be constructed with sixteen to twenty layers and may be divided into an upper group UG (or first group) or a lower group BG (or second group) including the same layers, each group including its corresponding layer. Figure 30B As shown, each layer in the upper group UG and the lower group BG can be the same or substantially the same. Figure 30B The vibration device 511 of the second vibration device 500 may include an upper group UG (or first group) and a lower group BG (or second group) containing the same layers. Each group includes its corresponding layer and may include a dummy group DG in the center. The dummy group DG (or third group) may not include the first electrode portion 511b and the second electrode portion 511c, thereby reducing costs. Figure 30B As shown, each layer in the upper group UG and the lower group BG may be the same or substantially the same.

[0550] The vibration device 511 of the second vibration device 500 may include an upper group UG (or first group) and a lower group BG (or second group) and may include a dummy group DG at the center thereof.

[0551] The second vibration device 500 according to an exemplary embodiment of the present disclosure may include a vibration device 511, the vibration device 511 may include a first group and a second group, and each of the first group and the second group may include: a vibration part 511a, which includes at least one layer having piezoelectric properties; a first electrode part 511b, which is arranged at a first surface of the vibration part 511a; and a second electrode part 511c, which is arranged at a second surface of the vibration part 511a opposite to the first surface.

[0552] According to another exemplary embodiment of the present disclosure, the second vibration device 500 may include a vibration device 511. The vibration device 511 may include first to third groups, and each of the first group UG and the second group BG may include: a vibration portion 511a including at least one layer having piezoelectric properties; a first electrode portion 511b disposed on a first surface of the vibration portion 511a; and a second electrode portion 511c disposed on a second surface of the vibration portion 511a opposite to the first surface. The third group DG may be configured with only the vibration portion 511a including at least one layer having piezoelectric properties and may be disposed between the first and second groups.

[0553] Figure 31 is a graph showing sound pressure level characteristics of a second vibration device according to an exemplary embodiment of the present disclosure.

[0554] The measurement method for sound output characteristics can be the same as that referenced above. Figure 21 The details described are the same except that the frequency measurement range is changed from 100 Hz to 20 kHz, so repeated descriptions can be omitted for the sake of brevity. Figure 31 , the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level SPL (dB). Figure 31 The sound pressure level characteristics of the second vibration device based on the plate 501 are shown, the thick solid line represents an embodiment in which the plate is set to non-impregnated paper, the single-dot chain line represents an embodiment in which the plate is set to impregnated paper, and the dotted line represents an embodiment in which the plate is set to aluminum (Al).

[0555] refer to Figure 31 , it can be seen that the non-impregnated paper (thick solid line) and the impregnated paper (single-dot chain line) are enhanced in the sound characteristics of the high-pitched vocal band of 2kHz or greater compared with the Al vibration plate (dashed line), and it can be seen that the non-impregnated paper (thick solid line) and the impregnated paper (single-dot chain line) show similar sound characteristics.

[0556] Figure 32 It shows Figure 2A equipment and Figure 27B An example of a graph of the sound pressure level characteristics of a vibration device.

[0557] The measurement method for sound output characteristics can be the same as that referenced above. Figure 21 The details of the description are the same and therefore may be omitted for the sake of brevity. Figure 32 In the , the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure level (SPL) (dB). Figure 32 In the sound pressure level measurement, the Figure 2A equipment and Figure 27B equipment, Figure 2A The sound pressure level characteristics of the equipment are given by Figure 32 The dotted line in the Figure 27B The sound pressure level characteristics of the equipment are given by Figure 32 The solid line in .

[0558] refer to Figure 32 , when the second vibration device 500 is set to Figure 27B When the device 10 is the same as that of the rear cover 300 (for example, when the second vibration device 500 is provided in the fifth region 5 of the rear cover 300), the sound pressure level may be reduced due to the deviation of the bending amount of the rear cover 300. For example, Figure 2A The second vibration device 500 of the device 10 may be disposed near an intersection of an outer corner of a major axis and a minor axis of the first region 1 or the thirteenth region 13. For example, Figure 27B The second vibration device 500 of the device 10 can be set in the short-axis edge area of ​​the back cover 300, and for example, can be set in the fifth area 5. When the first vibration device 400 and / or the second vibration device 500 are vibrating, the bending amount deviation of the back cover 300 near the short-axis outer corner can be greater than the bending amount deviation of the back cover 300 at the intersection of the short axis and the long axis at the outer corner, and therefore, a sound pressure level difference may occur. For example, the bending amount deviation of the back cover 300 is large. Figure 27B The second vibration device 500 of the device 10 may have a large deviation in the sound pressure level. For example, the deviation in the amount of bending of the back cover 300 is small. Figure 2A The second vibration device 500 of the device 10 may be small in terms of deviation in sound pressure level. Therefore, the second vibration device 500 can be set at a position where the deviation in the amount of bending of the supporting member (e.g., the back cover) is small, and thus, a device with enhanced sound characteristics and / or sound pressure level characteristics can be provided. For example, since the back cover 300 may have a deviation in the amount of bending, the second vibration device 500 can be set at a position where the deviation in the amount of bending caused by the back cover 300 is small, thereby improving the production yield of the device. As the size of the hole of the supporting member (e.g., the back cover) increases or the size of the vibration plate (e.g., the size of the display panel) increases, the second vibration device 500 can be set at a position where the deviation in the amount of bending caused by the back cover 300 is small, thereby improving the production yield of the device. Figure 27B The structure of the device 10 includes the sound pressure level of the full-tone vocal range of the tonal vocal range to enhance the sound pressure level of the second vibration device 500.

[0559] Figure 33 It shows Figure 2A An example of a graph of the sound pressure level characteristics of the device and the vibration device 27B.

[0560] The measurement method for sound output characteristics can be the same as that referenced above. Figure 21 The details of the description are the same and therefore may be omitted for the sake of brevity. Figure 33 In the , the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure level (SPL) (dB). Figure 33 middle, Figure 2A The sound pressure level characteristics of the first vibration device are represented by a thin solid line, Figure 2A The sound pressure level characteristics of the second vibration device are represented by the dotted line, Figure 27B The sound pressure level characteristics of the first vibration device are represented by a thick solid line, while Figure 27B The sound pressure level characteristics of the second vibration device are represented by the thick dashed line. Figure 2A In the second vibration device, Figure 30B As illustrated, a piezoelectric device including a dummy group DG is provided.

[0561] refer to Figure 33 ,exist Figure 2B In the first vibration device (thick solid line), the sound pressure level characteristics of the 2kHz (medium) tone vocal cord can be seen. Figure 27B The first vibration device (thin solid line) is enhanced compared to the first vibration device (thin solid line). Figure 2B In the second vibration device, it can be seen that the number of piezoelectric layers is Figure 27B The second vibration device 500 (dashed line) is reduced by about 40% and the area is reduced by about 50%, but due to the arrangement of the second vibration device 500, the sound characteristics and / or sound pressure level characteristics are similar.

[0562] Figure 34 is a vibration device showing an experimental example and Figure 2B A graph showing the sound pressure level characteristics of the device.

[0563] Set the volume of the PC to 100% and drive only one of the two channels of the device. Play Pink Noise Max as the driving source of the media player and measure the frequency of 20Hz to 20kHz 200 times by Fast Fourier Transform (FFT) analysis. In addition to the above description, the measurement method for sound output characteristics can be the same as that of the reference above. Figure 21 The details of the description are the same and therefore may be omitted for the sake of brevity. Figure 34, the horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (SPL) (dB). The vibration device of the experimental example has been provided as a device in which a first vibration generating device having an output power of 5W is installed at the lower end (or lower part) of the device. Figure 34 middle, Figure 2A The sound characteristics of the device are represented by a solid line, while the sound characteristics of a general panel vibration device are represented by a dotted line.

[0564] refer to Figure 34 , we can see that based on Figure 2B The provided device has enhanced sound pressure level characteristics in high frequencies of 7 kHz or more compared to the vibration device of the experimental example, and it can be seen that the Figure 2B The device provided has a fully enhanced sound pressure level value in the mid-low pitch sound of 2kHz or less. For example, in the 50Hz to 300Hz pitch sound band, it can be seen that the Figure 2B The provided apparatus has enhanced sound pressure level characteristics compared to the vibration device of the experimental example.

[0565] An apparatus according to one or more exemplary embodiments of the present disclosure is described below.

[0566] An apparatus according to an exemplary embodiment of the present disclosure may include: a vibration member; a back cover located at a rear surface of the vibration member; a first vibration device located at a first rear area of ​​the back cover; and a second vibration device located at a second rear area of ​​the back cover.

[0567] An apparatus according to some exemplary embodiments of the present disclosure may include a vibration member; a back cover located at a rear surface of the vibration member, the back cover being divided into a central area located at a center of the back cover, a peripheral area located at an periphery of the back cover, and a backbone area located between the central area and the peripheral area; a first vibration device located at a first rear area of ​​the back cover; and a second vibration device located at a second rear area of ​​the back cover.

[0568] According to some exemplary embodiments of the present disclosure, the first vibration device may overlap with at least one of a horizontal region and a middle region of the rear cover.

[0569] According to some exemplary embodiments of the present disclosure, the second vibration device may overlap with a peripheral area or a middle area of ​​the rear cover.

[0570] According to some exemplary embodiments of the present disclosure, the vibration member may include a display member configured to display an image, and the back cover may include a back cover portion located at a back surface of the display member.

[0571] According to some exemplary embodiments of the present disclosure, the rear cover portion may be configured to support the first vibration device and the second vibration device.

[0572] According to some exemplary embodiments of the present disclosure, the rear cover portion may include a first hole overlapping with the first vibration device.

[0573] According to some exemplary embodiments of the present disclosure, the rear cover portion may include a second hole overlapping with the second vibration device.

[0574] According to some exemplary embodiments of the present disclosure, the second vibration device may further include a plate located at a rear surface of the rear cover.

[0575] According to some exemplary embodiments of the present disclosure, the plate may include one or more of aluminum, non-impregnated paper, and impregnated paper.

[0576] According to some exemplary embodiments of the present disclosure, the second vibration device may include a piezoelectric device, and the piezoelectric device may include: a vibration part; a first electrode part, the first electrode part being located at a first surface of the vibration part; and a second electrode part, the second electrode part being located at a second surface of the vibration part opposite to the first surface.

[0577] According to some exemplary embodiments of the present disclosure, the vibration portion may include a piezoelectric material.

[0578] According to some exemplary embodiments of the present disclosure, the vibration portion may include a plurality of inorganic material portions having piezoelectric characteristics, and an organic material portion located between the plurality of inorganic material portions.

[0579] According to some exemplary embodiments of the present disclosure, the second vibration device may include a plate located at a rear surface of the vibration part.

[0580] According to some exemplary embodiments of the present disclosure, the second vibration device may include a piezoelectric device, the piezoelectric device including a first group and a second group, each of the first group and the second group including: a vibration part, the vibration part including at least one layer; a first electrode part, the first electrode part being located at a first surface of the vibration part; and a second electrode part, the second electrode part being located at a second surface of the vibration part opposite to the first surface.

[0581] According to some exemplary embodiments of the present disclosure, the piezoelectric device may further include a third group, the third group may include a vibration portion including at least one layer, and the third group may be located between the first group and the second group.

[0582] According to some exemplary embodiments of the present disclosure, the second vibration device may include two or more vibration generators configured to vibrate in the same direction.

[0583] According to some exemplary embodiments of the present disclosure, the vibration member may include a display member configured to display an image, and the display member may include: a display panel, which is configured to display an image; a guide member, which is supported by the back cover and is configured to support the outer portion of the back surface of the display panel; and a backlight part, which is supported by the back cover and is arranged at the back surface of the display panel.

[0584] According to some exemplary embodiments of the present disclosure, the backlight part may include a reflective sheet at the rear cover, a light guide plate on the reflective sheet, and an optical sheet part on the light guide plate.

[0585] According to some exemplary embodiments of the present disclosure, the back cover may include a first hole at the first rear area and a second hole at the second rear area, and the reflective sheet may be configured to cover or directly cover the first hole and the second hole.

[0586] An apparatus according to an exemplary embodiment of the present disclosure may include: a vibration member; a back cover located at a rear surface of the vibration member; a first vibration device located at a first rear area of ​​the back cover, the first vibration device overlapping at least one of a horizontal area and a middle area of ​​the back cover; and a second vibration device located at a second rear area of ​​the back cover, the second vibration device overlapping with a peripheral area or the middle area of ​​the back cover.

[0587] An apparatus according to an exemplary embodiment of the present disclosure may include: a vibration member; a back cover, the back cover being located at the rear surface of the vibration member, wherein the back cover is divided in a first direction into a central area located in the center of the back cover, a peripheral area located at the periphery of the back cover, and an intermediate area located between the central area and the peripheral area, and the back cover is divided in a second direction perpendicular to the first direction into two corner areas on the outside of the back cover and a horizontal area between the two corner areas; a first vibration device, the first vibration device being locat...

Claims

1. A device capable of providing sound, comprising: vibrating components; a rear cover located at a rear surface of the vibration member; a first vibration device located at a first rear area of ​​the rear cover; as well as a second vibration device, the second vibration device being located at a second rear area of ​​the rear cover, The back cover includes a left area and a right area relative to the center line, and is characterized in that: The left region includes the first region to the sixteenth region in matrix order from the upper left end to the lower right end, and the right region includes the first region to the sixteenth region in matrix order from the upper right end to the lower left end; The first vibration device is located at at least one of the sixth to eighth regions and the tenth to twelfth regions; and The second vibration device is located at at least one of the first region, the second region, the fifth region, the sixth region, the ninth region, the tenth region, the thirteenth region, and the fourteenth region, and Wherein, the first vibration device and the second vibration device are arranged diagonally adjacent to each other.

2. The device according to claim 1, wherein The first vibration device overlaps with at least one of a horizontal area and a middle area of ​​the rear cover.

3. The device according to claim 1, wherein The second vibration device overlaps with a peripheral area or a middle area of ​​the rear cover.

4. The device according to claim 1, wherein The vibration member includes a display member configured to display an image, and Wherein, the back cover includes a back cover portion located at the back surface of the display member.

5. The device according to claim 4, wherein The rear cover portion is configured to support the first vibration device and the second vibration device.

6. The device according to claim 4, wherein The rear cover portion includes a first hole overlapping the first vibration device.

7. The apparatus according to claim 4, wherein The rear cover portion includes a second hole overlapping the second vibration device.

8. The apparatus according to claim 1, wherein The second vibration device includes a plate located at a rear surface of the rear cover.

9. The apparatus according to claim 8, wherein The plate includes one or more of aluminum, non-impregnated paper, and impregnated paper.

10. The apparatus according to claim 1, wherein The second vibrating device comprises a piezoelectric device, and The piezoelectric device comprises: Vibration part; a first electrode portion located at a first surface of the vibration portion; and A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

11. The apparatus according to claim 10, wherein The vibration portion includes a piezoelectric material.

12. The apparatus according to claim 10, wherein The vibration part includes: a plurality of inorganic material portions, the plurality of inorganic material portions having piezoelectric properties; and An organic material portion is located between the plurality of inorganic material portions.

13. The apparatus according to claim 10, wherein The second vibration device includes a plate located at a rear surface of the vibration portion.

14. The apparatus according to claim 1, wherein The second vibration device includes a piezoelectric device, the piezoelectric device includes a first group, a second group and a third group, and Wherein, each of the first group and the second group includes: a vibrating portion, the vibrating portion comprising at least one layer; a first electrode portion located at a first surface of the vibration portion; and A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

15. The apparatus according to claim 14, wherein The third group includes a vibrating portion, the vibrating portion of the third group includes at least one layer, and The third group is located between the first group and the second group.

16. The apparatus according to claim 1, wherein The second vibration device includes two or more vibration generators configured to vibrate in the same direction.

17. The apparatus according to claim 1, wherein The vibration member includes a display member configured to display an image, and Wherein, the display component includes: a display panel configured to display the image; a guide member supported by the rear cover and configured to support a peripheral portion of a rear surface of the display panel; and A backlight portion is supported by the rear cover and disposed at the rear surface of the display panel.

18. The apparatus according to claim 17, wherein The backlight part includes: a reflective sheet, the reflective sheet being located on the back cover; a light guide plate, the light guide plate being located on the reflective sheet; and An optical sheet portion is located on the light guide plate.

19. The apparatus according to claim 18, wherein The rear cover includes a first hole at the first rear area and a second hole at the second rear area, and The reflective sheet is configured to cover or directly cover the first hole and the second hole.

20. A device capable of providing sound, the device comprising: vibrating components; a rear cover located at a rear surface of the vibration member; a first vibration device located at a first rear region of the rear cover, the first vibration device overlapping at least one of a horizontal region and a middle region of the rear cover; as well as a second vibration device, the second vibration device being located at a second rear area of ​​the rear cover, the second vibration device overlapping with the peripheral area or the middle area of ​​the rear cover, The back cover includes a left area and a right area relative to the center line, and is characterized in that: The left region includes the first region to the sixteenth region in matrix order from the upper left end to the lower right end, and the right region includes the first region to the sixteenth region in matrix order from the upper right end to the lower left end; The first vibration device is located at at least one of the sixth to eighth regions and the tenth to twelfth regions; and The second vibration device is located at at least one of the first region, the second region, the fifth region, the sixth region, the ninth region, the tenth region, the thirteenth region, and the fourteenth region, and Wherein, the first vibration device and the second vibration device are arranged diagonally adjacent to each other.

21. The apparatus according to claim 20, wherein The vibration member includes a display member configured to display an image, and Wherein, the back cover includes a back cover portion located at the back surface of the display member.

22. The apparatus according to claim 21, wherein The rear cover portion is configured to support the first vibration device and the second vibration device.

23. The apparatus of claim 21, wherein: The rear cover portion includes a first hole overlapping the first vibration device.

24. The apparatus of claim 21, wherein The rear cover portion includes a second hole overlapping the second vibration device.

25. The apparatus of claim 24, wherein: The second vibration device comprises: A plate is provided at the rear surface of the rear cover.

26. The apparatus of claim 25, wherein: The plate includes one or more of aluminum, non-impregnated paper, and impregnated paper.

27. The apparatus of claim 20, wherein: The second vibrating device comprises a piezoelectric device, and Wherein, the piezoelectric device comprises: Vibration part; a first electrode portion located at a first surface of the vibration portion; and A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

28. The device of claim 27, wherein the vibrating portion comprises a piezoelectric material.

29. The apparatus of claim 27, wherein The vibration part includes: a plurality of inorganic material portions, the plurality of inorganic material portions having piezoelectric properties; and An organic material portion is located between the plurality of inorganic material portions.

30. The apparatus of claim 20, wherein: The second vibration device comprises: piezoelectric devices; and A plate is located at a rear surface of the piezoelectric device.

31. The apparatus of claim 20, wherein: The second vibration device includes a piezoelectric device, the piezoelectric device includes a first group and a second group, and Wherein, each of the first group and the second group includes: a vibrating portion, the vibrating portion comprising at least one layer; a first electrode portion located at a first surface of the vibration portion; and A second electrode portion is located at a second surface of the vibration portion opposite to the first surface.

32. The apparatus according to claim 31, in, The piezoelectric device further comprises a third group, wherein the third group includes a vibrating portion, the vibrating portion of the third group includes at least one layer, and The third group is located between the first group and the second group.

33. The apparatus of claim 20, wherein: The second vibration device includes two or more vibration generators configured to vibrate in the same direction.

34. The apparatus of claim 20, wherein: The vibration member includes a display member configured to display an image, and Wherein, the display component includes: a display panel configured to display the image; a guide member supported by the rear cover and configured to support a peripheral portion of a rear surface of the display panel; and A backlight portion is supported by the rear cover and disposed at the rear surface of the display panel.

35. The apparatus of claim 34, wherein The backlight part includes: a reflective sheet, the reflective sheet being located on the back cover; a light guide plate, the light guide plate being located on the reflective sheet; and An optical sheet portion is located on the light guide plate.

36. The apparatus according to claim 35, in, The rear cover includes a first hole at the first rear area and a second hole at the second rear area, and The reflective sheet is configured to cover or directly cover the first hole and the second hole.

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