Display device and method of manufacturing a vibration generating device

Abstract

A display device and a method for manufacturing a vibration generating device. A display device includes a display panel configured to display an image and a vibration generating device configured to vibrate the display panel. The vibration generating device includes a plurality of first parts having piezoelectric characteristics and a plurality of second parts disposed between the plurality of first parts to have flexibility.

Description

Technical Field

[0001] The present disclosure relates to a display device. Background Art

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

[0003] A speaker applied to a display device may be, for example, an actuator including a magnet and a coil. However, when the actuator is applied to a display device, its thickness is relatively thick. Piezoelectric elements that can achieve thinning are receiving widespread attention.

[0004] Since the piezoelectric element has a fragile characteristic, the piezoelectric element is easily damaged by external impact, and due to this, the reliability of sound reproduction is low. In addition, since heat is generated due to the vibration of the piezoelectric element, the image quality of the display panel is adversely affected by the heat. Summary of the invention

[0005] Accordingly, embodiments of the present disclosure are directed to a display device that substantially obviates one or more problems due to limitations and disadvantages of the related art.

[0006] Therefore, the inventors have recognized the above problems and have conducted various experiments for improving sound quality and reducing heat generation. Through various experiments, the inventors have invented a display device having a new structure for improving sound quality and reducing heat generation.

[0007] An aspect of the present disclosure is to provide a display apparatus including a vibration generating device which is disposed on a rear surface of a display panel and vibrates the display panel to generate sound or vibration, thereby improving vibration characteristics.

[0008] Another aspect of the present disclosure is to provide a display apparatus including a vibration generating device for reducing heat generation.

[0009] Additional features and aspects will be described in the following description, and in part will be apparent from the description, or can be obtained by practicing the inventive concepts provided herein. Other features and aspects of the inventive concepts can be realized and obtained by structures specifically pointed out in the written description or derivable therefrom, and the claims and drawings thereof.

[0010] To achieve these and other inventive concepts, as embodied and broadly described herein, a display device includes a display panel configured to display an image and a vibration generating device configured to vibrate the display panel, wherein the vibration generating device includes a plurality of first parts having piezoelectric properties and a plurality of second parts arranged between the plurality of first parts to have flexibility.

[0011] In another aspect, a display device includes a display panel configured to display an image and a vibration generating device configured to vibrate the display panel, wherein the vibration generating device includes a piezoelectric composite layer including a plurality of first portions and a plurality of second portions.

[0012] 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.

[0013] Note 1. A display device, comprising:

[0014] A display panel configured to display an image; and

[0015] a vibration generating device configured to vibrate the display panel,

[0016] Wherein, the vibration generating device comprises:

[0017] a plurality of first portions, the plurality of first portions having piezoelectric properties; and

[0018] A plurality of second parts are provided, wherein the plurality of second parts are flexible and are disposed between the plurality of first parts.

[0019] Supplement 2. The display device according to Supplement 1, wherein the vibration generating device further comprises:

[0020] A third portion is disposed adjacent to the plurality of second portions.

[0021] Supplementary note 3. The display device according to Supplementary note 2, wherein AC driving is performed for the first part and the second part, and DC driving is performed for the third part.

[0022] Note 4. The display device according to Note 2, wherein the third part is arranged between the plurality of second parts.

[0023] Supplementary note 5. The display device according to Supplementary note 2, wherein the third portion surrounds the plurality of first portions and the plurality of second portions.

[0024] Supplement 6. The display device according to Supplement 1, further comprising:

[0025] a first electrode located on a lower surface of the vibration generating device; and

[0026] A second electrode, the second electrode is located on an upper surface of the vibration generating device.

[0027] Supplement 7. The display device according to Supplement 6, wherein the vibration generating device further comprises:

[0028] a first protective layer, the first protective layer being located on the first electrode; and

[0029] A second protective layer is located on the second electrode.

[0030] Supplement 8. The display device according to Supplement 6, further comprising:

[0031] a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel,

[0032] Wherein, the second electrode is located on the rear surface of the heat dissipation plate.

[0033] Supplementary note 9. The display device according to Supplementary note 6, wherein the first electrode is a signal electrode, and the second electrode is a ground electrode.

[0034] Supplement 10. The display device according to Supplement 2, wherein the third part is a PN junction device.

[0035] Supplement 11. The display device according to Supplement 10, further comprising:

[0036] a first electrode, the first electrode being located on a lower surface of the N-type device outside the third portion;

[0037] a second electrode located on an upper surface of the P-type device outside the third portion; and

[0038] A third electrode is located on the lower surface of the N-type device and the P-type device.

[0039] Supplement 12. The display device according to Supplement 11, further comprising:

[0040] a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel,

[0041] Wherein, the third electrode is arranged on the rear surface of the heat dissipation plate.

[0042] Supplementary note 13. The display device according to Supplementary note 2, wherein each of the first portion and the second portion is a vibration portion, and the third portion is a heat dissipation portion.

[0043] Supplement 14. The display device according to Supplement 1, wherein the vibration generating device is a sound generating device configured to vibrate the display panel to generate sound.

[0044] Supplement 15. The display device according to Supplement 1, wherein the vibration generating device is a tactile device configured to vibrate the display panel to output feedback based on a user's action.

[0045] Supplement 16. The display device according to Supplement 1, further comprising:

[0046] a supporting member located on a rear surface of the display panel; and

[0047] A connecting member is located between the display panel and the supporting member.

[0048] Supplement 17. The display device according to Supplement 16, wherein the supporting member comprises:

[0049] a rear surface portion covering the rear surface of the display panel with a gap space between the rear surface portion and the rear surface of the display panel; and

[0050] A side surface portion is connected to an outer circumference of the rear surface portion and covers a side surface of the display panel.

[0051] Supplement 18. The display device according to Supplement 1, wherein the vibration generating device is attached to the rear surface of the display panel by an adhesive member, and the adhesive member includes a hollow portion located between the display panel and the vibration generating device.

[0052] Supplementary note 19. The display device according to Supplementary note 1, wherein the first portion is formed of an inorganic material portion containing an electroactive material, and the second portion is formed of an organic material portion.

[0053] Supplement 20. The display device according to Supplement 1, wherein the vibration generating device is implemented using a film.

[0054] Note 21. The display device according to Note 16, further comprising:

[0055] a first partition located between the display panel and the supporting member; and

[0056] A second partition surrounds the vibration generating device.

[0057] Supplement 22. The display device according to Supplement 1, wherein the vibration generating device comprises:

[0058] A first vibration generating device and a second vibration generating device, the first vibration generating device and the second vibration generating device are located on a rear surface of the display panel.

[0059] Supplement 23. The display device according to Supplement 1, wherein the display panel comprises:

[0060] Multiple curved parts, concave or convex,

[0061] Wherein, the vibration generating device is disposed in a concave portion or a convex portion of each of the plurality of curved surface portions of the display panel.

[0062] Supplementary note 24. The display device according to Supplementary note 1, wherein the display panel is curved, and the vibration generating device includes a plurality of vibration generating devices arranged at certain intervals on a rear surface of the display panel.

[0063] Note 25. A display device, comprising:

[0064] A display panel configured to display an image; and

[0065] a vibration generating device configured to vibrate the display panel,

[0066] Wherein, the vibration generating device comprises:

[0067] A piezoelectric composite layer includes a plurality of first portions and a plurality of second portions.

[0068] Note 26. According to the display device of Note 25, the vibration generating device further comprises:

[0069] A component is disposed near the piezoelectric composite layer.

[0070] Supplementary note 27. The display device according to Supplementary note 26, wherein AC driving is performed for the piezoelectric composite layer, and DC driving is performed for the member.

[0071] Supplementary note 28. The display device according to Supplementary note 26, wherein the member has a heat dissipation property and is disposed between adjacent portions of the piezoelectric composite layer.

[0072] Supplementary note 29. The display device according to Supplementary note 26, wherein the member has a heat dissipation property and is disposed outside the piezoelectric composite layer.

[0073] Supplement 30. The display device according to Supplement 25, wherein the plurality of second portions are disposed between the plurality of first portions.

[0074] Note 31. The display device according to Note 25, further comprising:

[0075] a signal electrode located on a lower surface of the vibration generating device; and

[0076] A ground electrode is located on an upper surface of the vibration generating device.

[0077] Supplement 32. The display device according to Supplement 31, wherein the vibration generating device further comprises:

[0078] a first protective layer, the first protective layer being located on the signal electrode; and

[0079] A second protective layer is located on the ground electrode.

[0080] Note 33. The display device according to Note 31, further comprising:

[0081] a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel,

[0082] Wherein, the ground electrode is configured to contact the heat sink.

[0083] Supplementary note 34. The display device according to Supplementary note 26, wherein the component is a PN junction device.

[0084] Note 35. The display device according to Note 34, further comprising:

[0085] A signal electrode, the signal electrode being located on an upper surface of the N-type device outside the component;

[0086] a ground electrode located on an upper surface of the P-type device outside the member; and

[0087] A connecting electrode is located on a lower surface of each of the N-type device and the P-type device to connect the PN junction device.

[0088] Note 36. The display device according to Note 35, further comprising:

[0089] a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel,

[0090] Wherein, the connecting electrode is arranged on the rear surface of the heat dissipation plate.

[0091] Note 37. A display device according to Note 25, wherein the vibration generating device is implemented as one or more of a sound generating device configured to vibrate the display panel to generate sound and a tactile device configured to vibrate the display panel to output feedback based on the user's actions.

[0092] Note 38. The display device according to Note 25, further comprising:

[0093] a supporting member located on a rear surface of the display panel; and

[0094] A partition is located between the display panel and the support member.

[0095] Note 39. The display device according to Note 25, further comprising:

[0096] A partition surrounds the vibration generating device.

[0097] Supplement 40. The display device according to Supplement 25, further comprising:

[0098] a supporting member, the supporting member being located on a rear surface of the display panel;

[0099] a first partition located between the display panel and the supporting member; and

[0100] A second partition surrounds the vibration generating device.

[0101] Note 41. The display device according to Note 25, wherein the vibration generating device is attached to the rear surface of the display panel by an adhesive member, and the adhesive member includes a hollow portion located between the display panel and the vibration generating device.

[0102] Supplementary note 42. The display device according to Supplementary note 25, wherein the plurality of first portions are formed of an inorganic material portion containing an electroactive material, and the plurality of second portions are formed of an organic material portion.

[0103] Note 43. The display device according to Note 25, wherein the vibration generating device is implemented using a membrane.

[0104] Supplement 44. The display device according to Supplement 25, wherein the vibration generating device comprises:

[0105] A first vibration generating device and a second vibration generating device, the first vibration generating device and the second vibration generating device are located on a rear surface of the display panel.

[0106] Note 45. The display device according to Note 25, wherein the display panel comprises:

[0107] Multiple curved parts, concave or convex,

[0108] Wherein, the vibration generating device is disposed in a concave portion or a convex portion of each of the plurality of curved surface portions of the display panel.

[0109] Supplement 46. The display device according to Supplement 25, wherein the display panel is curved, and the vibration generating device includes a plurality of vibration generating devices arranged at certain intervals on the rear surface of the display panel.

[0110] Supplement 47. A method for manufacturing a vibration generating device, the method comprising the following steps:

[0111] Manufacturing an inorganic material mother substrate having piezoelectric properties through pretreatment;

[0112] Using a process of cutting or sawing the inorganic material mother substrate to form grooves or trenches between adjacent portions of the inorganic material mother substrate;

[0113] Filling the third portion of material into the groove or the trench between the adjacent portions of the inorganic material mother substrate;

[0114] forming a second recess or a second groove in each of two sides of the material of the third portion;

[0115] filling the second portion of material into the second recess or the second trench; and

[0116] The first portion, the second portion, and the third portion of the vibration generating device are formed through a grinding process or a cutting process.

[0117] Supplement 48. A method for manufacturing a vibration generating device, the method comprising the following steps:

[0118] Manufacturing an inorganic material mother substrate having piezoelectric properties through pretreatment;

[0119] forming a region between adjacent portions of the inorganic material mother substrate by using a process of cutting or sawing the inorganic material mother substrate;

[0120] filling the third portion of material into the region formed in the inorganic material mother substrate;

[0121] forming a groove or trench between the material of the third portion and the inorganic material mother substrate by using an etching process;

[0122] filling the recess or the groove with a second portion of material; and

[0123] The first portion, the second portion, and the third portion of the vibration generating device are formed through a grinding process or a cutting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0124] 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 embodiments of the disclosure and together with the description serve to explain the principle of the disclosure.

[0125] Figure 1 A display device according to an embodiment of the present disclosure is shown.

[0126] Figure 2 is along Figure 1 A cross-sectional view taken along line II' shown in FIG.

[0127] Figure 3 is a cross-sectional view of a vibration generating device according to an embodiment of the present disclosure.

[0128] Figure 4A A vibration generating device according to another embodiment of the present disclosure is shown.

[0129] Figure 4B is along Figure 4A A cross-sectional view taken along line II-II' shown in FIG.

[0130] FIG. 5A to FIG. 5C A driving waveform of a vibration generating device according to another embodiment of the present disclosure is shown.

[0131] 6A to 6F A method of manufacturing a vibration generating device according to another embodiment of the present disclosure is shown.

[0132] Fig. 7A A vibration generating device according to another embodiment of the present disclosure is shown.

[0133] Figure 7B is along Fig. 7A A cross-sectional view taken along line III-III' shown in FIG.

[0134] Fig. 8A A vibration generating device according to another embodiment of the present disclosure is shown.

[0135] Figure 8B is along Fig. 8A A cross-sectional view taken along line IV-IV' shown in FIG.

[0136] Figure 8C is along Fig. 8A A cross-sectional view taken along line V-V' shown in FIG.

[0137] 9A to 9F A method of manufacturing a vibration generating device according to another embodiment of the present disclosure is shown.

[0138] Fig.10 A display device according to another embodiment of the present disclosure is shown.

[0139] Fig.11 A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0140] Fig. 12A and Fig. 12B A vibration generating device according to another embodiment of the present disclosure is shown.

[0141] Fig.13A and Fig. 13B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0142] Fig.14A and Fig. 14B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0143] Fig.15A and Fig. 15B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0144] Fig.16A and Fig. 16B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0145] Fig.17A and Fig. 17B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0146] Fig.18 A display device according to another embodiment of the present disclosure is shown.

[0147] Fig.19 A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0148] FIG. 20A to FIG. 20C A display device according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0149] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings.

[0150] The advantages and features of the present disclosure and their implementation methods will be explained by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be implemented in different forms and should not be considered as being limited to the exemplary embodiments described. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. In addition, the present disclosure is limited only by the scope of the claims.

[0151] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals should be understood to refer to the same elements, features and structures. For clarity, illustration and convenience, the relative sizes and depictions of these elements may be enlarged. The described processing steps and / or the progression of operations are examples; however, the order of steps and / or operations is not limited to that set forth herein and may be changed as known in the art, except for the steps and / or operations that must occur in a particular order. Similar reference numerals are used throughout to represent similar elements. The names of the various elements used in the following description are selected only for the convenience of writing the specification and may therefore be different from those used in the actual product.

[0152] The shapes, sizes, ratios, angles, and quantities disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples, and therefore, the present disclosure is not limited to the details shown. Similar reference numerals represent similar elements throughout the specification. In the following description, when it is determined that the detailed description of related known functions or configurations will unnecessarily obscure the focus of the present disclosure, these detailed descriptions will be omitted.

[0153] In the case where “including,” “having,” and “comprising” described in the present specification are used, another part may be added unless “only to” is used. Unless otherwise indicated, terms in the singular form may include plural forms.

[0154] When explaining an element, the element is interpreted as including an error or tolerance range although there is no explicit description of such error or tolerance range.

[0155] When describing a positional relationship, for example, when the positional relationship between two components is described as "on," "above," "below," and "near," one or more other components may be disposed between the two components, unless more restrictive terms such as "only" or "directly" are used.

[0156] When describing a temporal relationship, for example, when a temporal order is described as, for example, "after," "subsequently," "next," and "before," discontinuities may be included unless more restrictive terms such as "only," "immediately," or "directly" are used.

[0157] It should 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 element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0158] When describing the elements of the present disclosure, the terms "first", "second", "A", "B", "(a)", "(b)", etc. may be used. These terms are intended to identify corresponding elements from other elements, and the basis, order or number of corresponding elements should not be limited by these terms. When an element or layer is "connected", "coupled" or "bonded" to another element or layer, the element or layer may not only be directly connected or bonded to the other element or layer, but may also be indirectly connected or bonded to the other element or layer with one or more intermediate elements or layers "disposed" between the element or layer and the other element or layer, unless otherwise specified.

[0159] The term "at least one" should be understood to include any and all combinations of one or more of the related listed elements. For example, the meaning of "at least one of a first element, a second element, and a third element" means all elements and combinations of the first element, the second element, or the third element from two or more of the first element, the second element, and the third element.

[0160] In the description of the embodiments, when a structure is described as being located "on or above" or "below or below" another structure, the description should be interpreted as including a case where the structures are in contact with each other and a case where a third structure is provided between the structure and the other structure. The size and thickness of each element shown in the drawings are given only for the convenience of description, and unless otherwise specified, the embodiments of the present disclosure are not limited thereto.

[0161] The features of the various embodiments of the present disclosure may be partially or entirely connected or combined with each other, and as can be fully understood by those skilled in the art, may interoperate with each other in various forms and be technically driven. The embodiments of the present disclosure may be performed independently of each other, or may be performed together in a mutually dependent relationship.

[0162] In the present disclosure, examples of display devices may include display devices in a narrow sense, such as an organic light emitting display (OLED) module or a liquid crystal module (LCM) including a display panel and a driver for driving the display panel. In addition, examples of display devices may include a complete set of devices (or complete sets of devices) or complete sets of electronic devices such as a notebook computer, a TV, a computer monitor, an equipment device including an automotive device or another type of device for a vehicle, or a mobile electronic device such as a smart phone or an electronic pad, which is a complete product (or final product) including an LCM or an OLED module.

[0163] Therefore, in the present disclosure, examples of the display device may include a display device itself in a narrow sense such as an LCM or an OLED module, and a complete set of devices including the LCM or the OLED module as a final consumer device or an application product.

[0164] In some embodiments, an LCM or OLED module including a display panel and a driver may be referred to as a display device in a narrow sense, and an electronic device as a final product including the LCM or OLED module may be referred to as a complete set of equipment. For example, a display device in a narrow sense may include a display panel such as an LCD or OLED and a source printed circuit board (PCB) as a controller for driving the display panel. The complete set of equipment may also include a complete set of PCBs, which are complete set of controllers electrically connected to the source PCBs to control the complete set of equipment as a whole.

[0165] The display panel applied to the embodiment of the present disclosure may use all types of display panels, such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and an electroluminescent display panel, but the embodiment is not limited to a specific display panel that is vibrated by the sound generating device according to the embodiment of the present disclosure to output sound. In addition, the shape or size of the display panel applied to the display device according to the embodiment of the present disclosure is not limited.

[0166] For example, if the display panel is a liquid crystal display panel, the display panel may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels, and the plurality of pixels are respectively arranged in a plurality of pixel regions defined by intersections of the gate lines and the data lines. In addition, the display panel may include an array substrate, an upper substrate, and a liquid crystal layer between the array substrate and the upper substrate, the array substrate including a thin film transistor (TFT), which is a switching element for adjusting the transmittance of each of the plurality of pixels, and the upper substrate including a color filter and / or a black matrix.

[0167] In addition, if the display panel is an organic light-emitting display panel, the display panel may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels, and the plurality of pixels are respectively arranged in a plurality of pixel regions defined by the intersection of the gate lines and the data lines. In addition, the display panel may include an array substrate, an organic light-emitting device layer, and an encapsulation substrate, the array substrate including a TFT, which is an element for selectively applying a voltage to each of the pixels, the organic light-emitting device layer being located on the array substrate, and the encapsulation substrate being arranged on the array substrate to cover the organic light-emitting device layer. The encapsulation substrate may protect the TFT and the organic light-emitting device layer from external impacts, and may prevent water or oxygen from penetrating into the organic light-emitting device layer. In addition, the layer arranged on the array substrate may include an inorganic light-emitting layer (e.g., a nanoscale material layer, quantum dots, etc.). As another example, the layer arranged on the array substrate may include a micro light-emitting diode.

[0168] The display panel may further include a backing such as a metal plate attached to the display panel. However, the embodiment is not limited to the metal plate, and the display panel may include another structure.

[0169] In the present disclosure, the display panel may be applied to a vehicle as a user interface module, such as a central control panel for a car. For example, the display panel may be disposed between occupants sitting on two front seats so as to transmit vibrations of the display panel to the interior of the vehicle. Thus, the audio experience in the vehicle is improved compared to a case where a speaker is disposed inside the vehicle.

[0170] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to the elements of each of the accompanying drawings, similar reference numerals may represent similar elements even though the same elements are shown in other drawings. In addition, for ease of description, the proportion of each element shown in the accompanying drawings is different from the actual proportion, and therefore, is not limited to the proportion shown in the accompanying drawings.

[0171] In order to make the display device provide sound, the speaker can be implemented as a membrane type, thereby making the thickness of the display device thinner. The membrane type vibration generating device can be manufactured to have a large area and can be applied to a display device having a large area, but since the piezoelectric characteristics of the membrane type vibration module are low, it is difficult to apply the membrane type vibration generating device to a large area due to low vibration. When ceramics are applied to enhance the piezoelectric characteristics, the durability of the membrane type vibration module is weak, and the size of the ceramics is limited. When a vibration module including a piezoelectric composite containing piezoelectric ceramics is applied to a display device, since the piezoelectric composite vibrates in a horizontal direction relative to the width direction (for example, a horizontal direction relative to the width direction of the display device), the display device cannot be fully vibrated in a vertical (or horizontal) direction, and therefore, it is difficult to apply the vibration module to the display device, and the desired sound cannot be output to the front area in front of the display device. When a membrane type piezoelectric body is applied to a display device, its sound pressure characteristics are lower than those of a general speaker such as an exciter. When a stacked piezoelectric body in which a membrane type piezoelectric body is configured to have multiple layers to increase the sound pressure is applied to a display device, power consumption increases, and the thickness of the display device becomes thicker. When the vibration generating device is applied to the haptic device, there is a problem that heat is generated due to the vibration of the vibration generating device. In addition, there is a problem that the image quality of the display panel is adversely affected by the heat.

[0172] Therefore, the inventors have conducted various experiments to realize a vibration generating device with enhanced heat dissipation characteristics. Through various experiments, the inventors have invented a display device including a vibration generating device with a new structure, which has heat dissipation characteristics. This will be described in detail below.

[0173] Figure 1 A display device according to an embodiment of the present disclosure is shown. Figure 2 is along Figure 1 A cross-sectional view taken along line II' shown in FIG.

[0174] Reference Figure 1 and Figure 2 , a display apparatus according to an embodiment of the present disclosure may include a display panel 100 and a vibration generating device 200 located on a rear surface of the display panel 100 .

[0175] The display panel 100 may display an image (e.g., an electronic image or a digital image), and may be implemented as a curved display panel or one of all types of display panels such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, an electroluminescent display panel, etc. If the display panel 100 vibrates based on the vibration of the vibration generating device 200 to generate sound (or sound waves) or to generate tactile feedback in response to a touch, the display panel 100 is not limited to a specific display panel.

[0176] The vibration generating device 200 may generate sound using the display panel 110 as a vibration plate. The vibration generating device may be referred to as an actuator, exciter, or transducer, but the term is not limited thereto. For example, the vibration generating device 200 may be a sound device that outputs sound based on an electrical signal.

[0177] The display panel 100 according to an embodiment of the present disclosure may include a display area AA, which displays an image based on driving of a plurality of pixels, and a non-display area BA, which surrounds the display area AA.

[0178] The display panel 100 according to an embodiment of the present disclosure may include a curved portion bent or curved to have a curved shape or a specific radius of curvature.

[0179] The curved portion of the display panel 100 may be provided in at least one of one periphery and another periphery of the display panel 100 that are parallel to each other. One periphery and / or another periphery of the display panel 100 provided with the curved portion may include only the non-display area BA, or may include the periphery of the display area AA and the non-display area BA. Here, the display panel 100 including the curved portion provided by bending the non-display area BA may have a structure in which one side frame bending structure or both sides frame bending structure. In addition, the display panel 100 including the periphery of the display area AA and the curved portion provided by bending the non-display area BA may have a structure in which one side active bending structure or both sides active bending structure.

[0180] For example, the display panel 100 may display an image in a type such as a top emission type, a bottom emission type, or a dual emission type based on a structure of a pixel array layer including an anode electrode, a cathode electrode, and an organic composite layer. In the top emission type, visible light emitted from the pixel array layer may be irradiated onto an area in front of a base substrate to allow an image to be displayed, while in the bottom emission type, visible light emitted from the pixel array layer may be irradiated onto a rearward area behind the base substrate to allow an image to be displayed.

[0181] The display panel 100 according to an embodiment of the present disclosure may include a pixel array portion disposed in a pixel area configured by a plurality of gate lines and / or a plurality of data lines. The pixel array portion may include a plurality of pixels that display an image based on a signal supplied through each signal line. The signal line may include a gate line, a data line, a pixel driving power line, etc.

[0182] Each of the plurality of pixels may include a pixel circuit layer including a driving thin film transistor (TFT) disposed in a pixel region, an anode electrode electrically connected to the driving TFT, a light emitting device layer formed on the anode electrode, and a cathode electrode electrically connected to the light emitting device layer.

[0183] The driving TFT may be disposed at a transistor region of each pixel region disposed in the substrate. The driving TFT may include a gate electrode, a gate insulating layer, a semiconductor layer, a source electrode, and a drain electrode. The semiconductor layer of the driving TFT may include silicon such as amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or low-temperature poly-Si, or may include an oxide such as indium-gallium-zinc-oxide (IGZO), but the embodiment is not limited thereto.

[0184] The anode electrode may be disposed at an opening region provided in each pixel region and may be electrically connected to the driving TFT.

[0185] The light emitting device layer according to an embodiment of the present disclosure may include an organic light emitting device disposed on an anode electrode. The organic light emitting device may be implemented so that pixels emit light of the same color (eg, white light) or emit light of different colors (eg, red light, green light, and blue light).

[0186] According to another embodiment of the present disclosure, the light emitting device layer may include a micro light emitting diode device electrically connected to each of the anode electrode and the cathode electrode. The micro light emitting diode device may be a light emitting diode implemented as an integrated circuit (IC) type or a chip type, and may include a first terminal electrically connected to the anode electrode and a second terminal electrically connected to the cathode electrode. The cathode electrode may be connected to a light emitting device of the light emitting device layer disposed at each pixel region.

[0187] The encapsulation portion may be formed on the substrate to surround the pixel array portion, thereby preventing oxygen or water (or moisture) from penetrating into the light-emitting device layer of the pixel array portion. The encapsulation portion according to the embodiment of the present disclosure may be formed as a multilayer structure in which organic material layers and inorganic material layers are alternately stacked, but the embodiment is not limited thereto. The inorganic material layer may prevent oxygen or water (or moisture) from penetrating into the light-emitting device layer of the pixel array portion. The organic material layer may be formed to have a relatively thicker thickness than that of the inorganic material layer to cover particles that appear during the manufacturing process. For example, the encapsulation portion may include a first inorganic layer, an organic layer on the first inorganic layer, and a second inorganic layer on the organic layer. The organic layer may be a particle covering layer.

[0188] The touch panel may be provided on the packaging portion, or may be provided on the rear surface of the pixel array portion.

[0189] The display device 10 according to an embodiment of the present disclosure may further include a support member 300 configured to support the display panel 100 , and a connection member 400 between the display panel 100 and the support member 300 .

[0190] The support member 300 may be referred to as other terms such as a bottom cover, a bottom plate, a back cover, a base frame, a metal frame, a metal chassis, a chassis base, or an m chassis. Therefore, the support member 300 may be a support member that supports the display panel 100, and may be implemented as any type of frame or plate structure, each of which is disposed on the rear surface of the display device 10.

[0191] The support member 300 according to an embodiment of the present disclosure may cover the entire rear surface of the display panel 100, with a gap space GS between the support member 300 and the entire rear surface of the display panel 100. For example, the support member 300 may include at least one of a glass material, a metal material, and a plastic material. Here, the edge or sharp corner of the support member 300 may have an inclined shape or a curved shape by a chamfering process or a corner rounding process. For example, the glass material of the support member 300 may be sapphire glass. As another example, the support member 300 including a metal material may include one of aluminum (Al), an Al alloy, a magnesium (Mg) alloy, and an iron (Fe)-nickel (Ni) alloy.

[0192] The support member 300 according to an embodiment of the present disclosure may additionally cover the side surface of the display panel 100. For example, the support member 300 may include a rear surface portion 310 covering the rear surface of the display panel 100 with a gap space GS between the rear surface portion 310 and the rear surface of the display panel 100, and a side surface portion 330 connected to an end of the rear surface portion 310 and covering the side surface of the display panel 100. For example, the rear surface portion 310 may cover a portion of the rear surface of the display panel 100 or the entire rear surface. For example, the side surface portion 330 may cover a portion of the side surface of the display panel 100 or the entire side surface. However, the embodiment of the present disclosure is not limited thereto, and the support member 300 may be implemented so that the rear surface portion 310 and the side surface portion 330 are provided as one body. The rear surface of the display panel 100 may be referred to as one surface, a backside surface, a first surface, or a bottom (or lower) surface, but the term is not limited thereto.

[0193] The side surface portion 330 may be implemented as a separate middle frame connected to the support member 300. In this case, the side surface portion 330 implemented as the middle frame may cover the support member 300, and, for example, may cover the entirety of the side surface of the rear surface portion 310 and the side surface of the display panel 100. For example, the side surface portion 330 implemented as the middle frame may include a material that is the same as or different from that of the support member 300.

[0194] The support member 300 according to an embodiment of the present disclosure may be connected to the rear periphery of the display panel 100 through the connection member 400. The connection member 400 may be disposed between the rear periphery of the display panel 100 and the periphery of the support member 300, and may attach the display panel 100 to the support member 300. The connection member 400 according to an embodiment of the present disclosure may be implemented with a double-sided tape, a single-sided tape, a double-sided adhesive foam pad, or a single-sided adhesive foam pad, but the embodiment is not limited thereto.

[0195] The display device according to an embodiment of the present disclosure may further include a front member 500 covering the non-display area BA of the display panel 100 .

[0196] The front member 500 may have a picture frame shape including an opening overlapping the display area AA of the display panel 100. For example, the front member 500 may be connected to the rear surface portion 310 or the middle frame, and may cover the non-display area BA of the display panel 100, thereby supporting or fixing the display panel 100. The front member 500 may be disposed at the front periphery of the display panel 100, and may be directly exposed to the user (or viewer), so that the aesthetic design appearance of the display device may be reduced, and the border width of the display device may be increased. In order to solve such a problem, according to an embodiment of the present disclosure, the display panel 100 may be connected to the support member 300 by the connecting member 400, and therefore, the front member 500 may be omitted (or removed), thereby reducing the border width of the display device and enhancing the aesthetic design appearance of the display device.

[0197] The vibration generating device 200 may be disposed on the rear surface (or backside surface) of the display panel 100. The vibration generating device 200 may be attached on the rear surface of the display panel 100 by an adhesive member 150.

[0198] The adhesive member 150 according to the embodiment of the present disclosure may be disposed between the rear surface of the display panel 100 and the vibration generating device 200. For example, the adhesive member 150 may attach the vibration generating device 200 to the rear surface of the display panel 100, and may be an adhesive or double-sided tape including an adhesive layer with good adhesive force or attachment force. For example, the adhesive layer of the adhesive member 150 may include epoxy resin, acrylic resin, silicon, polyurethane or paraffin, but the embodiment is not limited thereto. The adhesive layer of the adhesive member 150 may also include additives such as tackifiers, wax components or antioxidants. The additives may prevent the adhesive member 150 from being separated (peeled off) from the display panel 100 due to the vibration of the vibration generating device 200. For example, the tackifier may be a rosin derivative, etc., and the wax component may be paraffin, etc., but the embodiment of the present disclosure is not limited thereto. For example, the antioxidant may be a phenolic antioxidant, and may be, for example, a thioester, but the embodiment is not limited thereto.

[0199] According to another embodiment of the present disclosure, the adhesive member 150 may further include a hollow portion provided between the display panel 100 and the vibration generating device 200. The hollow portion of the adhesive member 150 may provide an air gap between the display panel 100 and the vibration generating device 200. Due to the air gap, a sound wave (or sound pressure) based on the vibration of the vibration generating device 200 may not be dispersed by the adhesive member 150 and may be concentrated on the display panel 100, and thus, a loss of vibration caused by the adhesive member 150 may be minimized, thereby increasing the sound pressure characteristics of the sound generated based on the vibration of the display panel 100.

[0200] The vibration generating device 200 may be implemented as a membrane type. The vibration generating device 200 may have a thickness thinner than that of the display panel 100, and thus, the thickness of the display panel 100 may not increase despite the vibration generating device 200. The vibration generating device 200 may be referred to as a sound generating module, a sound generating device, a membrane actuator, a membrane type piezoelectric composite actuator, a membrane speaker, a membrane type piezoelectric speaker, or a membrane type piezoelectric composite speaker, but the term is not limited thereto.

[0201] The vibration generating device 200 according to an embodiment of the present disclosure may include a plurality of first parts 210 and a plurality of second parts 220. For example, the plurality of first parts 210 may have piezoelectric characteristics, and the plurality of second parts 220 may supplement the impact resistance of each first part 210 and may have flexibility.

[0202] Each of the plurality of first portions 210 according to an embodiment of the present disclosure may be configured as an inorganic material portion. The inorganic material portion may include an electroactive material. The electroactive material may have such characteristics that a pressure or distortion (or bending) 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 and negative (-) ions, and vibration is generated by an electric field based on a voltage applied thereto.

[0203] Each of the plurality of second portions 220 according to an embodiment of the present disclosure may be configured as an organic material portion, and may be disposed to fill a space between the inorganic material portions as the first portion 210. Each organic material portion may be disposed between two adjacent inorganic material portions among the plurality of inorganic material portions, may absorb an impact applied to the inorganic material portion (or the first portion), may release stress accumulated on the inorganic material portion to enhance the overall durability of the vibration generating device 200, and may provide flexibility to the vibration generating device 200. The vibration generating device 200 may have flexibility and thus may be bent into a shape matching the shape of the display panel 100.

[0204] Each of the plurality of second parts 220 may be disposed between two adjacent first parts of the plurality of first parts 210. The plurality of first parts 210 and the plurality of second parts 220 may be disposed (or arranged) in parallel on the same plane (or the same layer). Each of the plurality of second parts 220 may be configured to fill the gap between two adjacent first parts of the plurality of first parts 210, and may be connected to or attached to the first part 210 adjacent thereto. Therefore, in the vibration generating device 200, the vibration energy based on the link in the unit grid of each first part 210 may be increased by the corresponding second part 220, and thus, the vibration may be increased, and the piezoelectric characteristics and flexibility may be ensured. In addition, in the vibration generating device 200, the second part 220 and the first part 210 may be alternately disposed on the same plane in the length direction X relative to one side of the vibration generating device 200, and thus a large-area composite film (or organic / inorganic composite film) having a single-layer structure may be constituted, and the large-area composite film may have a thin thickness, so that the thickness of the display device 10 does not increase.

[0205] Therefore, in the vibration generating device 200 of the display device according to the embodiment of the present disclosure, the inorganic material part (first part) and the organic material part (second part) can be arranged on the same layer, so that the impact transmitted to the inorganic material part can be absorbed by the organic material part, thereby preventing or reducing the inorganic material part from being damaged by the external impact applied to the display device, and reducing or minimizing the reduction in vibration performance (or reduction in sound performance) caused by the damage.

[0206] In addition, the vibration generating device 200 of the display device according to the embodiment of the present disclosure may include a piezoelectric ceramic having a perovskite crystal structure, and therefore, may vibrate (or mechanically displace) in response to an electrical signal applied from the outside. For example, when an alternating current (AC) voltage is applied to the inorganic material portion (first portion), the inorganic material portion may alternately contract and expand based on the inverse piezoelectric effect, and therefore, the vibration generating device 200 may vibrate based on a bending phenomenon in which the bending direction is alternately changed, thereby vibrating the display panel 100 based on the vibration of the vibration generating device 200 to provide sound or tactile feedback to the user.

[0207] In addition, the vibration generating device 200 according to the embodiment of the present disclosure may have a size corresponding to the display area AA of the display panel 100. The size of the vibration generating device 200 may be 0.9 to 1.1 times the size of the display area AA, but the embodiment is not limited thereto. For example, the size of the vibration generating device 200 may be the same or approximately equal to the size of the display area AA of the display panel 100, and thus, the vibration generating device 200 may cover most of the area of ​​the display panel 100. In addition, the vibration generated by the vibration generating device 200 may vibrate the entire portion of the display panel 100, and thus, the localization of the sound may be high, and the user's satisfaction may be improved. In addition, the contact area (or panel coverage) between the display panel 100 and the vibration generating device 200 may be increased, and thus, the vibration area of ​​the display panel 100 may be increased, thereby improving the sound of the mid-low pitch vocal cords generated based on the vibration of the display panel 100. Furthermore, in a large-sized display device, the entire portion of the display panel 100 having a large size (or a large area) may vibrate, and thus, localization of sound based on the vibration of the display panel 100 may be more enhanced, thereby achieving a stereo effect.

[0208] Therefore, the vibration generating device 200 according to the embodiment of the present disclosure can be set on the rear surface of the display panel 100 so that the display panel 100 fully vibrates in the vertical (or horizontal) direction, thereby outputting the desired sound to the front area in front of the display device. Moreover, the material included in the vibration generating device 200 can be implemented as a pattern shape including an organic material part and an inorganic material part, and therefore, the area (or size) of the vibration generating device 200 can be infinitely increased, whereby the panel coverage of the vibration generating device 200 can be increased relative to the display panel 100 to enhance the sound characteristics based on the vibration of the display panel 100. Moreover, the vibration generating device 200 can be implemented with a film, so it can be thinned, thereby reducing or preventing the increase of the driving voltage. For example, the vibration generating device 200 can be configured to have a wide area corresponding to the same size as the size of the display panel 100, and therefore, the sound pressure characteristics of the low-pitched vocal cords, which are the disadvantages of the film-type piezoelectric body or the stacked piezoelectric body, can be improved, and the driving voltage can be reduced. Moreover, the vibration generating device 200 according to an embodiment of the present disclosure may include an inorganic material portion and an organic material portion, and may be implemented as a thin film type, and thus may be integrated into or assembled in a display device without interference caused by mechanical elements and / or another element constituting the display device.

[0209] The vibration generating device 200 may vibrate based on an electrical signal to vibrate the display panel 100. For example, the vibration generating device 200 may be a sound generating device that vibrates based on a voice signal synchronized with an image displayed by the display panel 100 to vibrate the display panel 100 to generate sound. As another example, the vibration generating device 200 may be a tactile device that vibrates based on a tactile feedback signal (or tactile feedback signal) synchronized with a user's touch applied to a touch panel (or touch sensor layer) disposed in the display panel 100 or embedded in the display panel 100 to vibrate the display panel 100. For example, the vibration generating device 200 may be a tactile device that vibrates the display panel 100 to output feedback based on the user's action. Therefore, the display panel 100 may vibrate based on the vibration of the vibration generating device 200 to provide at least one of sound and tactile feedback to the user (or viewer).

[0210] Figure 3 is a cross-sectional view of a vibration generating device according to an embodiment of the present disclosure.

[0211] Combination Figure 2 And refer to Figure 3 , the vibration generating device 200 according to the embodiment of the present disclosure may include a piezoelectric composite layer PCL, a first electrode 230 , and a second electrode 240 .

[0212] The piezoelectric composite layer PCL may include a plurality of first portions 210 and a plurality of second portions 220 , each of the plurality of second portions 220 being disposed between two adjacent first portions of the plurality of first portions 210 .

[0213] Each of the plurality of first parts 210 according to an embodiment of the present disclosure may include an inorganic material or a piezoelectric material that vibrates based on a piezoelectric effect (or piezoelectric characteristics) caused by an electric field. For example, each of the plurality of first parts 210 may be referred to as an electroactive part, an inorganic material part, a piezoelectric material part, or a vibrating part, but the embodiment is not limited thereto.

[0214] Each of the plurality of first portions 210 according to an embodiment may be formed of a ceramic-based material for generating relatively high vibration, or may be formed of 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-like structure with orientation. The perovskite crystal structure may be represented by a chemical formula of "ABO 3 Here, A may include a divalent metal element, and B may include a tetravalent metal element. For example, in the chemical formula "ABO 3 ", A and B can be cations, and O can be an anion. For example, the chemical formula "ABO 3 " may include PbTiO 3 、PbZrO3 、BaTiO 3 , and SrTiO 3 However, the implementation manner is not limited thereto.

[0215] The perovskite crystal structure includes central ions (such as PbTiO 3 ), the position of Ti ions can be changed by external stress or magnetic field, and thus, polarization can be changed, thereby generating a piezoelectric effect. For example, in the perovskite crystal structure, the cubic shape corresponding to the symmetrical structure can be changed to a tetragonal, tetragonal or rhombohedral structure corresponding to the asymmetrical structure, and thus, a piezoelectric effect can be generated. In the tetragonal, tetragonal or rhombohedral structure corresponding to the asymmetrical structure, polarization may be high in the morphological phase boundary, and the rearrangement of polarization may be easy, so the perovskite crystal structure may have high piezoelectric properties.

[0216] For example, the inorganic material portion disposed in each of the plurality of first portions 210 may include one or more materials of lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb), but the embodiment is not limited thereto.

[0217] As another example, the inorganic material portion provided in each of the plurality of first portions 210 may include a lead zirconate titanate (PZT)-based material including lead (Pb), zirconium (Zr), and titanium (Ti), or may include a nickel zirconate niobium (PZNN)-based material including lead (Pb), zinc (Zn), nickel (Ni), and niobium (Nb), but the embodiment is not limited thereto. In addition, the inorganic material portion may include CaTiO 3 、BaTiO 3 and SrTiO 3 At least one of, each without Pb, but the embodiment is not limited thereto.

[0218] Each of the plurality of first portions 210 may include a polygonal pattern. For example, the plurality of first portions 210 may each include a line pattern having a first width d1. For example, the plurality of first portions 210 may be spaced apart from each other by a second width d2 (or a specific interval) in the first direction X, and may be arranged in parallel in a second direction Y intersecting the first direction X. Each of the plurality of first portions 210 may have the same size (e.g., the same width, area, or volume) within a process error (or allowable error) occurring in a manufacturing process.

[0219] Each of the plurality of second parts 220 according to the embodiment of the present disclosure may have a modulus and viscoelasticity lower than that of each first part 210, and therefore, the reliability of each first part 210 susceptible to impact due to fragile characteristics may be enhanced. For example, when the vibration generating device 200 for vibrating the display panel 100 has impact resistance and high rigidity, the vibration generating device 200 may have maximum vibration characteristics. In order to make the vibration generating device 200 have impact resistance and high rigidity, the plurality of second parts 220 may each include a material having a relatively high damping factor (tan δ) and a relatively high rigidity. For example, the plurality of second parts 220 may each include a material having a damping factor (tan δ) of about 0.1 [Gpa] to about 1 [Gpa] and a relatively high rigidity of about 0 [Gpa] to about 10 [Gpa]. In addition, the damping factor (tan δ) and the stiffness characteristics can be described based on the correlation between the loss coefficient and the modulus, and in this case, the plurality of second portions 220 can each include a material having a loss coefficient of approximately 0.01 to approximately 1 and a modulus of approximately 1 [Gpa] to approximately 10 [Gpa].

[0220] The organic material portion provided in each of the plurality of second portions 220 may include an organic material or an organic polymer each having a flexible property compared to the inorganic material portion as each of the first portions 210. For example, each of the plurality of second portions 220 may include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material. For example, each of the plurality of second portions 220 may be referred to as an adhesive portion, an elastic portion, a bending portion, a damping portion, or a flexible portion, but the embodiment is not limited thereto.

[0221] The organic material portion according to an embodiment of the present disclosure may include at least one of an organic piezoelectric material and an organic non-piezoelectric material.

[0222] The organic material portion including the organic piezoelectric material can absorb the impact applied to the inorganic material portion (or the first portion), and thus can enhance the overall durability of the vibration generating device 200, and can provide piezoelectric characteristics corresponding to a specific level or higher. The organic piezoelectric material according to an embodiment of the present disclosure may be an organic material having an electroactive material. For example, the organic piezoelectric material may include at least one of polyvinylidene fluoride (PVDF), β-polyvinylidene fluoride (β-PVDF), and polyvinylidene fluoride (PVDF-TrFE), but the embodiment is not limited thereto.

[0223] The organic material portion including the organic non-piezoelectric material may include a curable resin composition and an adhesive including the curable resin composition, and thus, an impact applied to the inorganic material portion (or the first portion) may be absorbed, thereby improving the overall durability of the vibration generating device 200. The organic non-piezoelectric material according to an embodiment of the present disclosure may include at least one of an epoxy-based polymer, an acryl-based polymer, and a silicon-based polymer, but the embodiment is not limited thereto.

[0224] For example, the organic material portion including the organic non-piezoelectric material may include an adhesion promoter for bonding between the epoxy resin and the inorganic material portion for the high rigidity characteristics required for the vibration generating device 200. For example, the adhesion promoter may be a phosphate or the like. The organic material portion may be cured by at least one of a thermal curing process and a photocuring process. In the process of curing the organic material portion, a solvent-free type epoxy resin may be used to prevent the thickness uniformity of the vibration generating device 200 from being reduced due to shrinkage of the organic material portion caused by solvent volatilization.

[0225] In addition, the organic material portion including the organic non-piezoelectric material may further include a reinforcing agent for damping characteristics in addition to the high stiffness of the vibration generating device 200. For example, the reinforcing agent may be methyl methacrylate-butadiene-styrene (MBS) having a core-shell type, and the content of the reinforcing agent may be about 5wt% to about 40wt%. The reinforcing agent may be an elastomer having a core unit type, and may have a high coupling force with an epoxy resin such as an propylene-based polymer, and thus the impact resistance or damping characteristics of the vibration generating device 200 may be enhanced.

[0226] Each of the plurality of second parts 220 may include a polygonal pattern. Each of the plurality of second parts 220 may be disposed between two adjacent first parts of the plurality of first parts 210. The plurality of first parts 210 and the plurality of second parts 220 may be disposed (or arranged) in parallel on the same plane (or the same layer). Each of the plurality of second parts 220 may be configured to fill the gap between two adjacent first parts of the plurality of first parts 210, and may be connected to or attached to the first part 210 adjacent thereto. For example, the second parts 220 may each include a line pattern having a second width d2, and may be disposed in parallel with the corresponding first part 210 between two adjacent second parts 220. Each of the plurality of second parts 220 may have the same size (e.g., the same width, area, or volume) within the range of process errors (or tolerances) occurring in the manufacturing process.

[0227] The size of each second portion 220 may be the same as or different from the size of each first portion 210. For example, the size of each first portion 210 and the size of each second portion 220 may be set based on required conditions including vibration characteristics and / or flexibility of the vibration generating device 200.

[0228] In the piezoelectric composite layer PCL, the first part 210 including an inorganic material and having piezoelectric characteristics and the second part 220 including an organic material and having flexibility may be alternately repeated and connected to each other, and therefore, the piezoelectric composite layer PCL may have a film type. Therefore, the piezoelectric composite layer PCL may be bent based on the shape of the display panel 100, and may have a size corresponding to the display panel 100, or may have a size for realizing vibration characteristics or sound characteristics each set based on the vibration of the display panel 100. For example, the size of each first part 210 and the size of each second part 220 may be set based on the piezoelectric characteristics and flexibility. For example, in a display device requiring piezoelectric characteristics instead of flexibility, the size of each first part 210 may be adjusted to be larger than the size of each second part 220. As another example, in a display device requiring flexibility instead of piezoelectric characteristics, the size of each second part 220 may be adjusted to be larger than the size of each first part 210. Therefore, the piezoelectric composite layer PCL may be adjusted based on the characteristics required by the display device, and therefore, the piezoelectric composite layer PCL may be easily designed.

[0229] The first electrode 230 may be disposed on the first surface (or front surface) of the piezoelectric composite layer PCL. The first electrode 230 according to an embodiment of the present disclosure may include a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, an example of a transparent conductive material or a semi-transparent conductive material may include indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiment is not limited thereto. An example of an opaque conductive material may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), and Mg or an alloy thereof, but the embodiment is not limited thereto.

[0230] The second electrode 240 may be disposed on a second surface (or rear surface) of the piezoelectric composite layer PCL opposite to the first surface. The second electrode 240 according to an 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 240 may include the same material as the first electrode 230.

[0231] The vibration generating device 200 according to the embodiment of the present disclosure may further include a first protective layer 250 and a second protective layer 260 .

[0232] The first protective layer 250 may be disposed on the first electrode 230 and may protect the first surface of the piezoelectric composite layer PCL or the first electrode 230. For example, the first protective layer 250 may be a polyimide (PI) film or a polyethylene terephthalate (PET) film, but the embodiment is not limited thereto.

[0233] The second protective layer 260 may be disposed on the second electrode 240 and may protect the second surface of the piezoelectric composite layer PCL or the second electrode 240. For example, the second protective layer 260 may be a polyimide (PI) film or a polyethylene terephthalate (PET) film, but the embodiment is not limited thereto.

[0234] When the piezoelectric composite layer including the first part 210 and the second part 220 is attached to the rear surface of the display panel, the piezoelectric composite layer may be degraded due to the heat generated by the vibration of the piezoelectric composite layer and the heat generated by the emission of light of the light-emitting device layer included in the display panel, and therefore, the display panel may be degraded, resulting in the problem that the life of the light-emitting device layer is adversely affected and the image quality of the display panel is adversely affected. For example, when the vibration generating device is implemented as a tactile device, since the vibration should be performed at a very fast speed, the heat caused by the vibration of the vibration generating device may occur more. For example, when the vibration generating device is implemented as a tactile device using ultrasonic waves, since the ultrasonic wave frequency is high and the wavelength is short, the vibration generating device can generate strong vibrations, but since the vibration should be performed at a very fast speed, the amount of current may increase, and heat caused by the high vibration frequency may occur, resulting in heating of the vibration generating device. Therefore, the inventors conducted various experiments to prevent the life of the display device from being shortened due to the heating of the vibration generating device and to reduce power consumption. Through various experiments, the inventors have invented a display device having a new structure including a vibration generating device having a new structure, which can enhance the heat dissipation characteristics of the vibration generating device and increase the life of the display device. This will be described below.

[0235] Figure 4A A vibration generating device according to another embodiment of the present disclosure is shown. Figure 4B is along Figure 4A A cross-sectional view taken along line II-II' shown in FIG.

[0236] Reference Figure 4A and Figure 4B , a vibration generating device 700 according to another embodiment of the present disclosure may include a first part 710 , a second part 720 , and a third part 770 .

[0237] The description of the first part 710 and the second part 720 is the same as above. Figures 1 to 3 The descriptions given are the same, and therefore, a detailed description thereof is omitted.

[0238] For example, the first portion 710 may have piezoelectric properties, and the second portion 720 may have flexibility. For example, the first portion 710 may include an inorganic material portion, and the second portion 720 may include an organic material portion. For example, the first portion 710 and the second portion 720 may each include a piezoelectric composite layer PCL. For example, the first portion 710 and the second portion 720 may each be a vibration portion.

[0239] The third portion 770 may be disposed near the piezoelectric composite layer PCL. For example, the third portion 770 may be disposed between adjacent piezoelectric composite layers PCL. For example, the third portion 770 may be disposed near the second portion 720. For example, the third portion 770 may be disposed between adjacent second portions 720. For example, the third portion 770 may include a heat dissipation portion or a member having heat dissipation characteristics. For example, the third portion 770 may include a thermoelectric device. Thermoelectric phenomena may be reversible or direct energy conversion between heat and electricity, and may be phenomena that occur due to the movement of electrons and holes included in a material. Thermoelectric phenomena may be classified into: a Peltier effect, which uses a temperature difference between the two ends caused by an electric current applied to a thermoelectric material, or uses a thermal gradient; a Seebeck effect, in which electricity is generated by a temperature difference between the two ends of a material; and a Thomson effect, in which heat or heat absorption occurs when an electric current is applied to a material when a partial temperature difference occurs in a material. The thermoelectric device according to the embodiment of the present disclosure can be implemented using a device having one or more of the Peltier effect, the Seebeck effect, and the Thomson effect. The third portion 770 can be configured with one or more of an N-type device, a P-type device, and a PN junction device. For example, the P-type device may include a Bi 0.5 Sb 1.5 Te 3 Or Bi 0.3 Sb 1.7 Te 3 , but the embodiment is not limited thereto. For example, an N-type device may include Bi 2 Te 3 and Bi 2 Se 0.3 Te 0.7 , but the implementation mode is not limited thereto.

[0240] The vibration generating device 700 may include a first electrode 730 disposed on an upper surface thereof and a second electrode 740 disposed on a lower surface thereof. The vibration generating device 700 may include a first electrode 730 disposed on an upper surface of each of the first portion 710, the second portion 720, and the third portion and a second electrode 740 disposed on a lower surface of each of the first portion 710, the second portion 720, and the third portion. The first electrode 730 and the second electrode 740 may be used as the same electrode. For example, the first electrode 730 may be disposed on the lower surface of the vibration generating device 700, and the second electrode 740 may be disposed on the upper surface of the vibration generating device 700.

[0241] The first electrode 730 may be a signal electrode for applying a voltage to the vibration generating device 700. The second electrode 740 may be a ground electrode. For example, by applying a voltage to the first electrode 730 of the vibration generating device 700, a cooling effect may be achieved on the second electrode 740 side. For example, when the third portion 770 is implemented as a thermoelectric device having a Thomson effect, the first electrode 730 may be a heat dissipation surface and the second electrode 740 may be a cooling surface based on a partial temperature difference of the third portion 770. For example, the vibration generating device 700 may be placed so that the second electrode 740 as a ground electrode is disposed on the rear surface of the display panel 100, and thus may be implemented to cool the heat of the display panel 100 and / or the heat of the vibration generating device 700. Therefore, the vibration generating device 700 according to an embodiment of the present disclosure may be configured with a film that is a composite including the third portion 770 having a heat dissipation property, thereby achieving heat dissipation properties and vibration properties at the same time. Moreover, the vibration generating device 700 may be configured to have such an effect that the heat generated when the first portion 710 and the second portion 720 are vibrating is cooled by the third portion 770.

[0242] As another example, when the third portion 770 is implemented as a thermoelectric device having a Peltier effect, the first electrode 730 may be a heat dissipation surface, and the second electrode 740 may be a cooling surface. For example, the vibration generating device 700 may be placed so that the second electrode 740 as a ground electrode is provided on the rear surface of the display panel 100, and thus may be implemented to cool the heat caused by the vibration of the vibration generating device 700. Therefore, the heat caused by the vibration of the vibration generating device 700 may be reduced, and thus, the adverse effect on the image quality of the display panel 100 may be reduced, thereby improving the life of the display panel 100.

[0243] As another example, when the third portion 770 is implemented as a thermoelectric device having a Seebeck effect, the first electrode 730 may be a portion having a temperature relatively lower than that of the second electrode 740. For example, the first electrode 730 may be a portion exposed to the air or in contact with the support member 300, etc. The second electrode 740 may be a portion having a temperature relatively higher than that of the first electrode 730. For example, the second electrode 740 may be a portion in contact with the display panel 100. The vibration generating device 700 may be placed so that the second electrode 740, which is a portion having a relatively high temperature, is disposed on the rear surface of the display panel 100, and thus, a flow of current may be formed based on a temperature difference between the first electrode 730 and the second electrode 740, whereby the heat of the display panel 100 may be stored as electricity. Therefore, the consumption of driving power of the vibration generating device 700 may be reduced.

[0244] The size of the piezoelectric composite layer PCL may be the same as or different from the size of the third portion 770. For example, the size of the piezoelectric composite layer PCL may be equal to or greater than the size of the third portion 770. For example, the size of the third portion 770 may be greater than the size of the second portion 720. For example, the size of the first portion 710 and the size of the third portion 770 may be greater than the size of the second portion 720. Therefore, when the size of the first portion 710 and / or the size of the third portion 770 is greater than or longer than the size of the second portion 720, the piezoelectric characteristics and the heat dissipation characteristics may be enhanced.

[0245] The first electrode 730 according to the embodiment of the present disclosure may include a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, examples of transparent conductive materials or semi-transparent conductive materials may include indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiment is not limited thereto. Examples of opaque conductive materials may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), and Mg or alloys thereof, but the embodiment is not limited thereto.

[0246] The second electrode 740 may be disposed on a second surface (or rear surface) opposite to the first surface of the vibration generating device 700. The second electrode 740 according to an 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 740 may include the same material as that of the first electrode 730, but the embodiment is not limited thereto.

[0247] According to another embodiment of the present disclosure, the vibration generating device 700 may be a sound generating device that vibrates according to a voice signal synchronized with an image displayed by the display panel 100 to vibrate the display panel 100, thereby generating a sound. As another example, the vibration generating device 700 may be a tactile device that vibrates based on a tactile feedback signal (or tactile feedback signal) synchronized with a user's touch applied to a touch panel (or touch sensor layer) disposed on the display panel 100 or embedded in the display panel 100 to vibrate the display panel 100. For example, the vibration generating device 700 may be a tactile device that vibrates the display panel 100 to output feedback based on the user's action. For example, the vibration generating device 700 may be implemented using one or more of a sound generating device and a tactile device.

[0248] In the piezoelectric composite layer including the first part 710 and the second part 720, the driving of the third part 770 and the piezoelectric composite layer should be considered to realize the third part 770 having heat dissipation characteristics by using a film as a composite. When the driving of the first part 710 and the second part 720 and the driving of the third part 770 are performed independently, problems may occur due to different driving methods. Therefore, the driving circuit may be complicated, problems may occur in the case where the size of the driving circuit for driving each element is increased, and problems may occur in the case where the formation of the electrode is complicated due to the independent driving. Moreover, when the third part 770 is provided together with the first part 710 and the second part 720, the efficiency of the third part 770 is reduced. Hereinafter, reference will be made to FIG. 5A to FIG. 5C The driving of the piezoelectric composite layer and the third portion 770 is described in detail.

[0249] FIG. 5A to FIG. 5C A driving waveform of a vibration generating device according to another embodiment of the present disclosure is shown.

[0250] Figure 5A A driving waveform of each of the first portion 710 and the second portion 720 each including a piezoelectric composite layer is shown. The first portion 710 and the second portion 720 each including a piezoelectric composite layer may perform alternating current (AC) driving, and thus, may alternately contract and expand based on the inverse piezoelectric effect, thereby performing vibration based on a bending phenomenon in which a bending direction is alternately changed.

[0251] Figure 5B 770. The third part 770 may perform direct current (DC) driving, and therefore, when the direction of the current flowing in the third part 770 changes, the above reference Figure 4A and Figure 4BThe heat dissipation surface and the cooling surface described can switch functions therebetween. Therefore, when the DC drive of the first part 710 and the second part 720 each including the piezoelectric composite layer is applied to the third part 770, heat can be dissipated to the light emitting device layer of the display panel 100. When a constant current is applied to a diode additionally provided to drive the third part 770, the first part 710 and the second part 720 that should vibrate twice during one period P may vibrate once during one period P, resulting in a problem in which the vibration intensity is weakened.

[0252] When the first part 710, the second part 720 and the third part 770 are driven independently, separate drivers may be required and their driving waveforms may be different, resulting in problems such as reduced vibration characteristics and heat dissipation characteristics. Therefore, the inventors recognize that a ripple current wave should be implemented to simultaneously drive the first part 710, the second part 720 and the third part 770.

[0253] As another example, when implementing Figure 5B The waveform is shifted to Figure 5A When the waveform method is used, for example, when only the DC offset is applied, the intensity of the electric field may increase, and therefore, the first part 710, the second part 720, and the third part 770 may be damaged. In addition, when only the DC offset is applied, the first part 710, the second part 720, and the third part 770 may vibrate once during one period P, and therefore, the problem of reduced vibration characteristics may occur.

[0254] like Figure 5C As shown, the driver of the vibration generating device 700 may be configured with a bridge rectifier circuit to rectify the AC voltage into a ripple current wave, so that the first part 710 and the second part 720 may vibrate twice during one period P to maintain the vibration intensity, thereby improving the part where its vibration characteristics are reduced. In addition, a DC voltage may be applied to the third part 770, so that the third part 770 may cool the heat at a desired cooling surface. Therefore, the first part 710, the second part 720, and the third part 770 may be driven simultaneously, thereby realizing the vibration generating device 700 having vibration characteristics and heat dissipation characteristics.

[0255] The inventors have recognized that in order to implement the third part 770 at the piezoelectric composite layer including the first part 710 and the second part 720, the third part 770 having heat dissipation characteristics should be implemented using a film corresponding to a composite without increasing the thickness of the vibration generating device. In the vibration generating device 700, the firing temperature or sintering temperature of each of the first part 710 and the second part 720 each including the piezoelectric composite layer may be different from the firing temperature or sintering temperature of the third part 770, and therefore, there may be a problem that it is difficult to implement the third part 770 using a film as a composite. Therefore, there may be a problem that it is difficult to perform the firing or sintering of the first part 710 and the second part 720 and the firing or sintering of the third part 770 at the same time, and the first part 710, the second part 720, and the third part 770 may be damaged due to the firing or sintering temperature difference. Therefore, hereinafter, a method of individually configuring each of the first part 710, the second part 720, and the third part 770 using a film corresponding to a composite will be described in detail.

[0256] This will be referred to below FIG. 6A to FIG. 6B Give a description.

[0257] 6A to 6F A method of manufacturing a vibration generating device according to another embodiment of the present disclosure is shown.

[0258] Reference Fig. 6A , an inorganic material mother substrate having piezoelectric properties can be manufactured by pretreatment. The inorganic material mother substrate may have a plate shape, but the embodiment is not limited thereto. The pretreatment according to the embodiment of the present disclosure may mix and dry the ceramic raw materials, crystallize the crystal structure by a roasting or sintering process, and the inorganic material mother substrate 701 may be manufactured by performing a molding process and a sintering process at least once. The sintering process may use heat, pressure, and spark plasma, but the embodiment is not limited thereto. The roasting or sintering temperature of the inorganic material mother substrate 701 may be 1000°C or higher, but the embodiment is not limited thereto. For example, when an additive such as a sintering agent is added to the inorganic material mother substrate 701, the roasting or sintering temperature of the inorganic material mother substrate 701 may be 1000°C or lower.

[0259] Reference Fig. 6A and Figure 6B , a groove or trench may be formed between adjacent portions of the inorganic material mother substrate 701 using a process of cutting or sawing the inorganic material mother substrate 701. The inorganic material mother substrate 701 may be a first portion.

[0260] The third portion of material 707 may be filled into the grooves or trenches between adjacent portions of the inorganic material mother substrate 701 ( Figure 6C). The third portion material 707 may be formed by a screen printing or inkjet printing process, but the embodiment is not limited thereto. Subsequently, the third portion material 707 may be crystallized or recrystallized by a heat treatment process. The calcination or sintering temperature of the third portion material 707 may be about 500° C., but the embodiment is not limited thereto. The third portion material 707 may be a third portion.

[0261] Furthermore, a recess or groove 702a may be formed in each of the two sides of the third portion of material 707 ( Fig.6D The second portion of material 702 may be filled into the groove or trench 702a ( Fig. 6E ). The material 702 of the second part can be cured by a heat treatment process. The material 702 of the second part can be the second part.

[0262] like Fig. 6F In the embodiment, the first part 710, the second part 720 and the third part 770 of the vibration generating device may be formed by a process such as a grinding process or a cutting process. For example, the cutting process may be performed by at least one of a wire saw process, a scribing process, a blade cutting process, a stealth cutting process and a thermal laser separation (TLS) process, but the embodiment is not limited thereto.

[0263] For example, when forming the first portion 710, forming the second portion 720, and forming the third portion 770, the second portion 720 may be damaged due to the baking or sintering temperature difference between the second portion 720 and the third portion 770. For example, when forming the third portion 770, forming the first portion 710, and forming the second portion 720, the second portion 720 and the third portion 770 may be damaged due to the baking or sintering temperature difference between the third portion 770 and the first portion 710 and the baking or sintering temperature difference between the first portion 710 and the second portion 720. Therefore, when forming the first portion 710, forming the third portion 770, and forming the second portion 720, in order to prevent damage to the first portion 710, the second portion 720, and the third portion 770, damage to the first portion 710, the second portion 720, and the third portion 770 may be prevented based on the baking or sintering temperature difference between the first portion 710 and the third portion 770 and the baking or sintering temperature difference between the second portion 720 and the third portion 770.

[0264] Fig. 7A 800 according to another embodiment of the present disclosure. Figure 7B is along Fig. 7A A cross-sectional view taken along line III-III' shown in FIG.

[0265] Reference Fig. 7A and Figure 7B, a vibration generating device 800 according to another embodiment of the present disclosure may include a first part 810 , a second part 820 , and a third part 870 .

[0266] The description of the first part 710 and the second part 720 is the same as above. Figures 1 to 4B The descriptions given are the same, and therefore, a detailed description thereof is omitted.

[0267] For example, the first portion 810 may include an inorganic material portion, and the second portion 820 may include an organic material portion. For example, the first portion 810 and the second portion 820 may each include a piezoelectric composite layer PCL. For example, the first portion 810 and the second portion 820 may each be a vibration portion.

[0268] The third portion 870 may be disposed near the piezoelectric composite layer PCL. For example, the third portion 870 may be disposed outside the piezoelectric composite layer PCL. The third portion 870 may be disposed near the second portion 820. For example, the third portion 870 may be disposed to surround the first portion 810 and the second portion 820. The third portion 870 may include a heat dissipation portion or a member having heat dissipation properties. The description thereof is the same as that of the above reference Figure 4A and Figure 4B The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0269] The size of the piezoelectric composite layer PCL may be the same as or different from the size of the third portion 870. For example, the size of the piezoelectric composite layer PCL may be equal to or greater than the size of the third portion 870. For example, the size of the third portion 870 may be greater than the size of the second portion 820. For example, the size of the first portion 810 and the size of the third portion 870 may be greater than the size of the second portion 820. Therefore, when the size of the first portion 810 and / or the size of the third portion 870 is greater than or longer than the size of the second portion 820, the piezoelectric characteristics and the heat dissipation characteristics may be enhanced.

[0270] The vibration generating device 800 may include a first electrode 830 disposed on an upper surface thereof and a second electrode 840 disposed on a lower surface thereof. The vibration generating device 800 may include a first electrode 830 disposed on an upper surface of each of the first portion 810, the second portion 820, and the third portion 870 and a second electrode 840 disposed on a lower surface of each of the first portion 810, the second portion 820, and the third portion 870. The first electrode 830 and the second electrode 840 may be used interchangeably with each other. For example, the first electrode 830 may be disposed on a lower surface of the vibration generating device 800, and the second electrode 840 may be disposed on an upper surface of the vibration generating device 800. The first electrode 830 may be a signal electrode for applying a voltage to the vibration generating device 800. The second electrode 840 may be a ground electrode. For example, the first electrode 830 may be a heat dissipation surface, and the second electrode 840 may be a cooling surface.

[0271] According to another embodiment of the present disclosure, the vibration generating device 800 may be a sound generating device that vibrates based on a voice signal synchronized with an image displayed by the display panel 100 to vibrate the display panel 100, thereby generating a sound. As another example, the vibration generating device 800 may be a tactile device that vibrates based on a tactile feedback signal (or tactile feedback signal) synchronized with a user's touch applied to a touch panel (or touch sensor layer) disposed on the display panel 100 or embedded in the display panel 100 to vibrate the display panel 100. For example, the vibration generating device 800 may be a tactile device that vibrates the display panel 100 to output feedback based on the user's action. For example, the vibration generating device 800 may be implemented using one or more of a sound generating device and a tactile device.

[0272] Fig. 8A A vibration generating device according to another embodiment of the present disclosure is shown. Figure 8B is along Fig. 8A A cross-sectional view taken along line IV-IV' shown in FIG. Figure 8C is along Fig. 8A A cross-sectional view taken along line V-V' shown in FIG.

[0273] Reference Fig. 8A and Figure 8C , a vibration generating device 900 according to another embodiment of the present disclosure may include a first portion 910 , a second portion 920 , and a third portion 970 .

[0274] The description of the first part 910 and the second part 920 is the same as above. Figures 1 to 4B The descriptions given are the same, and therefore, a detailed description thereof is omitted.

[0275] For example, the first portion 910 may include an inorganic material portion, and the second portion 920 may include an organic material portion. For example, the first portion 910 and the second portion 920 may each include a piezoelectric composite layer PCL. For example, the first portion 910 and the second portion 920 may each be a vibration portion.

[0276] The third portion 970 may be disposed near the piezoelectric composite layer PCL. For example, the third portion 970 may be disposed near the second portion 920. For example, the third portion 970 may be disposed near the first portion 910 and the second portion 920. For example, the third portion 970 may be disposed outside the first portion 910 and the second portion 920. For example, the third portion 970 may be disposed around the first portion 910 and the second portion 920. For example, the third portion 970 may include a heat dissipation portion or a member having heat dissipation characteristics. The third portion 970 may be configured with a PN junction device and may include a P-type device 907P and an N-type device 970N. The size of the piezoelectric composite layer PCL may be the same as or different from the size of the third portion 970. For example, the size of the piezoelectric composite layer PCL may be equal to or greater than the size of the third portion 970. For example, the size of the third portion 970 may be greater than the size of the second portion 920. For example, the size of the first portion 910 and the size of the third portion 970 may be greater than the size of the second portion 920. Therefore, when the size of the first portion 910 and / or the size of the third portion 970 is larger than or longer than the size of the second portion 920, the piezoelectric characteristics and the heat dissipation characteristics may be enhanced.

[0277] Reference Figure 8B, the first electrode 930 and the second electrode 940 may be disposed on the upper surface and the lower surface of the vibration generating device 900, respectively, and the first portion 910, the second portion 920, and the third portion 970 are disposed on the upper surface and the lower surface of the vibration generating device 900. For example, the first electrode 930 may be disposed on the upper surface of each of the first portion 910 and the second portion 920. For example, the second electrode 940 may be disposed on the lower surface of each of the first portion 910 and the second portion 920. The second electrode 940 may be disposed on the upper surface of each of the P-type device 970P and the N-type device 970N. For example, the first electrode 930 and the second electrode 940 may be disposed at the center of the vibration generating device 900. For example, the first electrode 930 may be disposed on the upper surface of the vibration generating device 900, and the second electrode 940 may be disposed on the lower surface of the vibration generating device 900. The first electrode 930 and the second electrode 940 may be used interchangeably with each other. For example, the first electrode 930 may be disposed on the lower surface of the vibration generating device 900, and the second electrode 940 may be disposed on the upper surface of the vibration generating device 900. For example, the first electrode 930 may be a signal electrode for applying a voltage to the vibration generating device 900. The second electrode 940 may be a ground electrode. For example, the first electrode 930 may be a heat dissipation surface, and the second electrode 940 may be a cooling surface. Therefore, the vibration generating device 900 may be placed so that the second electrode 940 as a cooling surface is disposed on the rear surface of the display panel 100, and thus, the adverse effect of the heat caused by the vibration of the vibration generating device 900 on the image quality of the display panel 100 may be reduced or minimized.

[0278] The 3-2nd electrode 950b may be disposed on the lower surface of the N-type device 970N as the third portion 970 disposed outside the vibration generating device 900. The 3-2nd electrode 950b may be disposed on the lower surface of the P-type device 970P as the third portion 970 disposed outside the vibration generating device 900, and the second electrode 940 may be disposed on the upper surface of the P-type device 970P. Figure 8C, a third electrode 950 for connecting a PN junction device as the third portion 970 may be disposed below the third portion 970. The third electrode 950 may be a connecting electrode, a current path electrode, or a current auxiliary electrode, but the term is not limited thereto. The third electrode 950 may include a 3-1st electrode 950a and a 3-2nd electrode 950b. For example, the third electrode 950 may be an electrode that electrically connects a P-type device 970P to an N-type device 970N. The 3-1st electrode 950a disposed on the upper surface of the PN junction device may be a heat dissipation surface, and the 3-2nd electrode 950b disposed on the lower surface of the PN junction device may be a cooling surface. Therefore, the vibration generating device 900 may be placed so that the 3-2nd electrode 950b as a cooling surface is disposed on the rear surface of the display panel 100, and therefore, the adverse effect of heat caused by the vibration of the vibration generating device 900 on the image quality of the display panel 100 may be reduced or minimized.

[0279] The second electrode 940 may be disposed on an upper surface of a P-type device 970P as the third portion 970 disposed at the outermost or outer portion of the vibration generating device 900. The first electrode 930 may be disposed on an upper surface of an N-type device 970N as the third portion 970 disposed at the outermost or outer portion of the vibration generating device 900.

[0280] For example, the PN junction device can be arranged in a zigzag shape. In this case, the cooling efficiency can be improved compared with the P-type device or the N-type device.

[0281] According to another embodiment of the present disclosure, the vibration generating device 900 may be a sound generating device that vibrates according to a voice signal synchronized with an image displayed by the display panel 100 to vibrate the display panel 100, thereby generating a sound. As another example, the vibration generating device 900 may be a tactile device that vibrates based on a tactile feedback signal (or tactile feedback signal) synchronized with a user's touch applied to a touch panel (or touch sensor layer) disposed on the display panel 100 or embedded in the display panel 100 to vibrate the display panel 100. For example, the vibration generating device 900 may be a tactile device that vibrates the display panel 100 to output feedback based on the user's action. For example, the vibration generating device 900 may be implemented using one or more of a sound generating device and a tactile device.

[0282] 9A to 9F A method of manufacturing a vibration generating device according to another embodiment of the present disclosure is shown.

[0283] Reference Fig. 9A, an inorganic material mother substrate having piezoelectric properties can be manufactured by pretreatment. The inorganic material mother substrate may have a plate shape, but the embodiment is not limited thereto. The pretreatment according to the embodiment of the present disclosure may mix and dry the ceramic raw materials, crystallize the crystal structure by a roasting or sintering process, and the inorganic material mother substrate 701 may be manufactured by performing a molding process and a sintering process at least once. The sintering process may use heat, pressure, and spark plasma, but the embodiment is not limited thereto. The roasting or sintering temperature of the inorganic material mother substrate 901 may be 1000°C or higher, but the embodiment is not limited thereto. For example, when an additive such as a sintering agent is added to the inorganic material mother substrate 901, the roasting or sintering temperature of the inorganic material mother substrate 901 may be 1000°C or lower. The inorganic material mother substrate 901 may be the first part.

[0284] Reference Fig. 9B , a region 907 a filled with the third portion of the material 907 may be formed between adjacent portions of the inorganic material mother substrate 901 by using a process of cutting or sawing the inorganic material mother substrate 901 . Fig. 9B (b) is along Fig. 9B 9. The figure is taken along the line a'-a" in (a) and it can be seen that a groove or a trench is provided between adjacent portions of the inorganic material mother substrate 901. The material 907 of the third part can be filled into the region 907a formed in the inorganic material mother substrate 901 ( Fig. 9C ). Fig. 9C (b) is along Fig. 9C The figure is taken along the line a'-a" in (a), and is a figure showing an example in which the material 907 of the third part is filled into the area between adjacent parts of the inorganic material mother substrate 901. The material 907 of the third part can be solutionized and formed by a screen printing or inkjet printing process, but the embodiment is not limited to this. Subsequently, the material 907 of the third part can be crystallized or recrystallized by a heat treatment process. The calcination or sintering temperature of the material 907 of the third part can be about 500°C, but the embodiment is not limited to this. The material 907 of the third part can be the third part.

[0285] In addition, a groove or trench 902a ( Fig.9D ). Fig.9D (b) is along Fig.9D 1 and 2. The diagram is taken along line b′-b″ in (a) and is a diagram showing an example of forming a groove or trench 902a between the material 907 of the third portion and the inorganic material mother substrate 901.

[0286] The second portion of material 902 may be filled into the recess or groove 902a ( Fig.9E ). Fig.9E (b) is along Fig.9E , and is a diagram taken along line b'-b" in (a), and is a diagram showing an example in which the material 902 of the second portion is filled into the area between adjacent portions of the inorganic material mother substrate 901. The material 902 of the second portion may be cured by a heat treatment process. For example, the heat treatment process may be performed as a process such as thermal curing, natural curing, and ultraviolet (UV) curing, but the embodiment is not limited thereto. The material 902 of the second portion may be the second portion.

[0287] like Fig.9F In the embodiment, the first part 910, the second part 920 and the third part 970 of the vibration generating device may be formed by a process such as a grinding process or a cutting process. For example, the cutting process may be performed by at least one of a wire saw process, a scribing process, a blade cutting process, a stealth cutting process and a thermal laser separation (TLS) process, but the embodiment is not limited thereto.

[0288] For example, when forming the first portion 910, forming the second portion 920, and forming the third portion 970, the second portion 920 may be damaged due to the baking or sintering temperature difference between the second portion 920 and the third portion 970. For example, when forming the third portion 970, forming the first portion 910, and forming the second portion 920, the second portion 920 and the third portion 970 may be damaged due to the baking or sintering temperature difference between the third portion 970 and the first portion 910 and the baking or sintering temperature difference between the first portion 910 and the second portion 920. Therefore, when forming the first portion 910, forming the third portion 970, and forming the second portion 920, in order to prevent damage to the first portion 910, the second portion 920, and the third portion 970, damage to the first portion 910, the second portion 920, and the third portion 970 may be prevented based on the baking or sintering temperature difference between the first portion 910 and the third portion 970 and the baking or sintering temperature difference between the second portion 920 and the third portion 970.

[0289] Fig.10 A display device according to another embodiment of the present disclosure is shown.

[0290] Reference Fig.10 , a display device 20 according to another embodiment of the present disclosure may include a display panel 100 and a vibration generating device 700 disposed on a rear surface of the display panel 100. The vibration generating device 700 may be configured as Figure 4A , Fig. 7A and Fig. 8A In the following embodiments, for example, the vibration generating device will be described. Figure 4A A vibration generating device in.

[0291] The vibration generating device 700 may include a first portion 710, a second portion 720 and a third portion 770. The description thereof is the same as that of the above reference Figure 4A The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0292] The vibration generating device 700 may be disposed on the rear surface of the display panel 100 through the adhesive member 150 .

[0293] The heat dissipation plate 130 may be further disposed between the display panel 100 and the vibration generating device 700. For example, the heat dissipation plate 130 may be disposed on the rear surface of the display panel 100 through the adhesive member 150.

[0294] The heat sink 130 may reduce or lower the heat generated due to the vibration of the vibration generating device 700. The heat sink 130 may be configured to cover the vibration generating device 700 or have a size greater than the size of the vibration generating device 700. The heat sink 130 may have a polygonal plate shape or a circular plate shape with a certain thickness, but the embodiment is not limited thereto. For example, the heat sink 130 may include a metal material with high thermal conductivity, such as aluminum (Al), copper (Cu) or silver (Ag) or an alloy thereof, but the embodiment is not limited thereto. The heat sink 130 may be a heat dissipation member, a heat sink, a heat dissipation belt or a heat dissipation pad, but the term is not limited thereto. Therefore, since the heat sink 130 is provided, the adverse effect of the heat caused by the vibration of the vibration generating device 700 on the image quality of the display panel 100 can be reduced.

[0295] The heat sink 130 may be disposed in the vibration generating device 700 using an adhesive member. The adhesive member may include a double-sided tape, a single-sided tape, an adhesive and an adhesive, but the embodiment is not limited thereto. As another example, the adhesive member may include the same material as the material of the adhesive member 150 disposed on the rear surface of the display panel 100, but is not limited thereto. For example, the adhesive layer of the adhesive member 150 may include epoxy resin, acrylic resin, silicon, polyurethane or paraffin, but the embodiment is not limited thereto. The adhesive layer of the adhesive member 150 may also include additives such as a tackifier, a wax component or an antioxidant, and the additive may prevent the adhesive member 150 from being separated (peeled off) from the display panel 100 due to the vibration of the vibration generating device 200. For example, the tackifier may be a rosin derivative, etc., and the wax component may be paraffin, etc., but the embodiment is not limited thereto. For example, the antioxidant may be a phenolic antioxidant, and may be, for example, a thioester, but the embodiment is not limited thereto.

[0296] The vibration generating device 700 may be disposed so that the second electrode 740 is closer to the heat sink 130 than the first electrode 730. For example, the second electrode 740 as a ground electrode may be disposed closer to the heat sink 130 than the first electrode 730 as a signal electrode. For example, the second electrode 740 as a cooling surface may be disposed on the heat sink 130, and thus, the adverse effect of heat caused by the vibration of the vibration generating device 700 on the image quality of the display panel 100 may be reduced or minimized. Therefore, since the heat sink 130 and the vibration generating device 700 having heat dissipation characteristics are provided, and the cooling surface of the vibration generating device 700 is disposed adjacent to the heat sink, the adverse effect of heat caused by the vibration of the vibration generating device 700 on the image quality of the display panel 100 may be reduced or minimized, and the life of the display device 20 may be improved.

[0297] Fig.11 A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown. Fig. 12A and Fig. 12B A vibration generating device according to another embodiment of the present disclosure is shown.

[0298] Reference Figures 11 to 12B According to another embodiment of the present disclosure, a vibration generating device may include a first portion, a second portion, and a third portion. The vibration generating device may be configured as Figure 4A , Fig. 7A and Fig. 8A In the following embodiments, for example, the vibration generating device will be described. Figure 4A A vibration generating device in.

[0299] The vibration generating device 700 may further include a first electrode disposed on a first surface of the vibration generating device 700 and a second electrode disposed on a second surface of the vibration generating device 700 opposite to the first surface. In addition, the vibration generating device 700 may further include a first passivation layer covering the first electrode and a second passivation layer covering the second electrode. Fig. 8A When the vibration generating device 700 is used, the vibration generating device 700 may further include a third electrode. The first electrode, the second electrode, the third electrode, the first passivation layer, and the second passivation layer are the same as those described above, and therefore, a repeated description thereof is omitted. FIG. 13A to FIG. 17B In the description given, the same description can be applied.

[0300] The display device 30 according to an embodiment of the present disclosure may further include a partition 600 near the display panel 100. The partition 600 may be an air gap or space that generates sound when the display panel 100 is vibrated by the vibration generating device 700. The air gap or space that generates or transmits sound may be referred to as a "partition". The partition may be referred to as a closure or a baffle, but the term is not limited thereto.

[0301] For example, the spacer 600 may include a first spacer 610. The first spacer 610 may be disposed between the display panel 100 and the support member 300.

[0302] For example, the first partition 610 may be disposed along an area between the rear periphery of the display panel 100 and the front periphery of the support member 300. The first partition 610 may be referred to as an edge partition, a periphery partition, a sound blocking member, an edge closure, a periphery closure, or a baffle, but the term is not limited thereto. For example, the first partition 610 may be disposed in contact with or adjacent to the display panel 100. Figure 2 As another example, the first partition 610 and the connecting member 400 may be implemented as one body.

[0303] For example, the partition 600 may include a second partition 620. The second partition 620 may surround the vibration generating device 700. The second partition 620 according to the embodiment of the present disclosure may have a circular shape surrounding the vibration generating device 700, but the embodiment is not limited thereto. For example, the second partition 620 may have a shape that is the same as or different from the overall shape. For example, when the vibration generating device 700 has a rectangular (e.g., quadrangular or square) shape, the second partition 620 may have a rectangular (e.g., quadrangular or square) shape having a size relatively larger than the size of the vibration generating device 700.

[0304] The second partition 620 may limit (or define) the vibration region (or vibration area) of the display panel 100 performed by the vibration generating device 700. For example, in the display panel 100, as the size of the second partition 620 increases, the vibration region of the display panel 100 may increase, and thus, the characteristics of the low-pitched vocal cords may be enhanced. On the other hand, in the display panel 100, as the size of the second partition 620 decreases, the vibration region of the display panel 100 may decrease, and thus, the characteristics of the high-pitched vocal cords may be enhanced. Therefore, the size of the second partition 620 may be set based on the characteristics of the vocal cords according to the vibration of the display panel 100. For example, the frequency of the low-pitched vocal cords may be 200 Hz or less, the frequency of the middle-pitched vocal cords may be 200 Hz to 3 kHz, and the frequency of the high-pitched vocal cords may be 3 kHz. However, the embodiment is not limited thereto.

[0305] For example, the partition 600 may include polyurethane, polyolefin, etc., but the embodiment is not limited thereto. As another example, the partition 600 may include a single-sided tape, a double-sided tape, a single-sided foam pad, a double-sided foam pad, a single-sided foam tape, and / or a double-sided foam tape, and may include, for example, a material having an elastic force capable of being compressed to a certain extent.

[0306] The first spacer 610 may provide a first air gap AG1 between the display panel 100 and the support member 300 together with the second spacer 620. For example, the first air gap AG1 may be referred to as a vibration space, a sound pressure space, a sound box, a sound portion, a resonance box, or a resonance portion, but the term is not limited thereto.

[0307] The first air gap AG1 may be provided in a region of the display panel 100 surrounded by the second spacer 620 provided in the display panel 100 and the first spacer 610 provided in the display panel 100 .

[0308] Therefore, the display device 30 according to the embodiment of the present disclosure may include the partition 600 , and thus may optimize the reproduction soundtrack.For example, the display device 30 according to the embodiment of the present disclosure may include at least one of the first partition 610 and the second partition 620 .

[0309] Reference Fig. 12A The vibration generating device 700 may be implemented with a first portion 710, a second portion 720, and a third portion 770 arranged along the length direction. When arranged along the length direction, the vibration generating device 700 may be applied to a rollable display device that can be rolled along the horizontal direction of the display panel.

[0310] As another example, Fig. 12B As shown, the vibration generating device 700 may be implemented with a first portion 710, a second portion 720, and a third portion 770 arranged in the width direction. When arranged in the width direction, the vibration generating device 700 may be applied to a rollable display device that can be rolled in a vertical direction of a display panel.

[0311] Fig.13A and Fig. 13B is a diagram illustrating a display apparatus including a vibration generating device according to another embodiment of the present disclosure.

[0312] Reference Fig.13A and Fig. 13B According to another embodiment of the present disclosure, a vibration generating device may include a first part, a second part, and a third part, and may be configured as Figure 4A , Fig. 7A and Fig. 8A One of the vibration generating devices in.

[0313] The plurality of first portions 710 according to an embodiment of the present disclosure may be arranged apart from each other in the first direction X and the second direction Y to have a quadrangular shape (or a square shape). The plurality of first portions 710 may be disposed adjacent to each other to have a quadrangular shape (or a square shape).

[0314] Each of the plurality of second portions 720 may be disposed or provided between two adjacent first portions 710 of the plurality of first portions 710. For example, each of the plurality of third portions 770 may be disposed or provided between two adjacent second portions 720 of the plurality of second portions 720. For example, each of the third portions 770 may have a "+" shape, and the third portion of the "+" shape is disposed between two second portions 720 forming a quadrangular (e.g., rectangular) shape (or a square shape) among the four second portions 720.

[0315] The vibration generating device 700 may further include a first electrode disposed on a first surface of the vibration generating device 700 and a second electrode disposed on a second surface of the vibration generating device 700 opposite to the first surface. In addition, the vibration generating device 700 may further include a first passivation layer covering the first electrode and a second passivation layer covering the second electrode. Fig. 8A When the vibration generating device 700 is used, the vibration generating device 700 may further include a third electrode. The first electrode, the second electrode, the third electrode, the first passivation layer, and the second passivation layer are the same as the description given above, and therefore, a repeated description thereof is omitted.

[0316] The display device according to the embodiment of the present disclosure may further include a partition 600 located between the display panel 100 and the support member 300. The partition 600 is similar to the above-mentioned Fig. 12A and Fig. 12B The described partition 600 is the same, and therefore, a repeated description thereof is omitted.

[0317] Reference Fig.13A The vibration generating device 700 may be implemented with a first portion 710, a second portion 720, and a third portion 770 arranged along the length direction. When arranged along the length direction, the vibration generating device 700 may be applied to a rollable display device that can be rolled along the horizontal direction of the display panel.

[0318] As another example, Fig. 13B As shown, the vibration generating device 700 may be implemented with a first portion 710, a second portion 720, and a third portion 770 arranged in the width direction. When arranged in the width direction, the vibration generating device 700 may be applied to a rollable display device that can be rolled in a vertical direction of a display panel.

[0319] Therefore, the display device according to the embodiment of the present disclosure may output sound through the vibration generating device 700 to provide sound to the user. In addition, the display device according to the embodiment of the present disclosure may provide vibration through the vibration generating device 700, thereby providing tactile feedback to the user. In addition, the display device according to the embodiment of the present disclosure may include a partition 600 to further enhance the sound characteristics.

[0320] Fig.14A and Fig. 14B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0321] Reference Fig.14A and Fig. 14B , the vibration generating device may include a first vibration generating device 700 - 1 and a second vibration generating device 700 - 2 disposed on the rear surface of the display panel 100 . Fig.14A 1 shows an embodiment in which the vibration generating device 700 is arranged along the length direction. Fig. 14B 1 shows an embodiment in which the vibration generating device 700 is arranged along the width direction. Fig. 12A and Fig. 12B The description given is the same, therefore, the detailed description thereof is omitted. The vibration generating device may include a first part, a second part and a third part, and may be configured as Figure 4A , Fig. 7A and Fig. 8A The description of the partition is the same as that of the above reference Fig. 12A and Fig. 12B The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0322] The first vibration generating device 700-1 and the second vibration generating device 700-2 may be arranged in the display panel 100 in a staggered or diagonal manner, so that the vibration area of ​​the display panel 100 may be increased. For example, in addition to the first vibration generating device 700-1, the second vibration generating device 700-2 may be arranged, so that the vibration sound PVS1 and / or the tactile feedback may be further enhanced. The first vibration generating device 700-1 and the second vibration generating device 700-2 may vibrate the display panel 100, so that the display panel 100 may generate the vibration sound PVS1 or may generate the tactile feedback. For example, the vibration area of ​​the display panel 100 may be increased based on the diagonal arrangement structure of the first vibration generating device 700-1 and the second vibration generating device 700-2, thereby enhancing the characteristics of the low-pitched vocal cords. The diagonal arrangement structure of the first vibration generating device 700 - 1 and the second vibration generating device 700 - 2 may have the effect of enabling the vibration generating devices to be arranged in the display panel 100 in a 2×2 structure, thereby reducing the number of vibration generating devices that vibrate the display panel 100 by half.

[0323] Fig.15A and Fig. 15B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0324] Reference Fig.15A and Fig. 15B , the vibration generating device may include a first vibration generating device 700 - 1 and a second vibration generating device 700 - 2 disposed on the rear surface of the display panel 100 . Fig.15A 2 is a diagram showing an example in which the vibration generating device 700 is arranged in the length direction. Fig. 15B 700 is a diagram showing an example in which the vibration generating device 700 is arranged in the width direction. Fig. 12A and Fig. 12B The description given is the same, therefore, the detailed description thereof is omitted. The vibration generating device may include a first part, a second part and a third part, and may be configured as Figure 4A , Fig. 7A and Fig. 8A The description of the partition is the same as that of the above reference Fig. 12A and Fig. 12B The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0325] The first vibration generating device 700-1 and the second vibration generating device 700-2 may be disposed in parallel in the display panel 100 along the first direction X or the second direction Y. The vibration area of ​​the display panel 100 may be increased based on the parallel arrangement structure of the first vibration generating device 700-1 and the second vibration generating device 700-2, thereby enhancing the characteristics of the low-pitched vocal cords.

[0326] Fig.16A and Fig. 16B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0327] Reference Fig.16A and Fig. 16B , the vibration generating device may include a first vibration generating device 700 - 1 and a second vibration generating device 700 - 2 disposed on the rear surface of the display panel 100 . Fig.16A An example is shown in which the vibration generating device 700 is arranged along the length direction. Fig. 16B 1 shows an example in which the vibration generating device 700 is arranged in the width direction. Fig. 12A and Fig. 12B The description given is the same, therefore, the detailed description thereof is omitted. The vibration generating device may include a first part, a second part and a third part, and may be configured as Figure 4A , Fig. 7A and Fig. 8AThe description of the partition is the same as that of the above reference Fig. 12A and Fig. 12B The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0328] The first vibration generating device 700-1 and the second vibration generating device 700-2 may be separately disposed in the display panel 100 along the first direction X or the second direction Y. Since the first vibration generating device 700-1 and the second vibration generating device 700-2 are separately disposed, the vibration area of ​​the display panel 100 may be increased. For example, in addition to the first vibration generating device 700-1, the second vibration generating device 700-2 may be further disposed, and thus, the vibration sound PVS1 and / or the tactile feedback may be further enhanced. Therefore, since the first vibration generating device 700-1 and the second vibration generating device 700-2 are separately disposed, the left sound and the right sound may be separately output, thereby providing stereo sound or tactile feedback to the user.

[0329] As another example, in the display device 30, the vibration generating device 700 may be disposed in an area where the heating temperature is high. For example, when the vibration generating device 700 is disposed at a lower portion relative to the center of the display device 30, the heat of the display device 30 may be cooled, thereby better preventing the display panel 100 from being degraded due to the heat of the light-emitting device layer included in the display panel 100. For example, when the vibration generating device 700 is disposed closer to a heat source causing heat generation in a source printed circuit board (PCB) or a control board provided with a driving circuit for driving the display panel and the vibration generating device, etc., the heat of the display device 30 may be cooled, thereby better preventing the display panel 100 from being degraded due to the heat of the light-emitting device layer included in the display panel 100.

[0330] As another example, in an image where the vibration generating device 700 is not driven as a sound generating device, by using the Seebeck effect of the third part, heat occurring in the display panel can be obtained as electricity, and thus, consumption of driving power of the vibration generating device 700 can be reduced.

[0331] As another example, when the vibration generating device 700 is implemented as a sound generating device, in an operation of reducing the volume of the sound, all of the first vibration generating device 700-1 and the second vibration generating device 700-2 may not be driven, and one of the first vibration generating device 700-1 and the second vibration generating device 700-2 may be driven. Therefore, energy may be generated based on the vibration of one of the first vibration generating device 700-1 and the second vibration generating device 700-2, and the generated energy may be used to vibrate one of the first vibration generating device 700-1 and the second vibration generating device 700-2, thereby achieving energy collection.

[0332] As another example, when the vibration generating device 700 is implemented as a haptic device, the vibration generating device 700 may be driven, and when the vibration generating device 700 is not implemented as a haptic device, the vibration generating device 700 may not be driven. In this case, the first vibration generating device 700-1 of the vibration generating device 700 may be implemented as a cooling device, and the second vibration generating device 700-2 may be implemented as a collecting device, thereby reducing power consumption.

[0333] Fig.17A and Fig. 17B A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0334] Reference Fig.17A and Fig. 17B The vibration generating device may include a first vibration generating device 700 - 1 , a second vibration generating device 700 - 2 , a third vibration generating device 700 - 3 , and a fourth vibration generating device 700 - 4 disposed on the rear surface of the display panel 100 . Fig.17A 2 is a diagram showing an example in which the vibration generating device 700 is arranged in the length direction. Fig. 17B 700 is a diagram showing an example in which the vibration generating device 700 is arranged in the width direction. Fig. 12A and Fig. 12B The description given is the same, therefore, the detailed description thereof is omitted. The vibration generating device may include a first part, a second part and a third part, and may be configured as Figure 4A , Fig. 7A and Fig. 8A The description of the partition is the same as that of the above reference Fig. 12A and Fig. 12B The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0335] The first vibration generating device 700-1 may be disposed in a left area of ​​the display panel 100, and the fourth vibration generating device 700-4 may be disposed in a right area of ​​the display panel 100. The second vibration generating device 700-2 and the third vibration generating device 700-3 may be disposed in a central area of ​​the display panel 100. For example, the second vibration generating device 700-2 and the third vibration generating device 700-3 may be disposed between the first vibration generating device 700-1 and the fourth vibration generating device 700-4.

[0336] The first vibration generating device 700-1, the second vibration generating device 700-2, the third vibration generating device 700-3, and the fourth vibration generating device 700-4 may be disposed separately from each other in the first direction X or the second direction Y in the display panel 100. For example, the first vibration generating device 700-1 may be disposed separately from the second vibration generating device 700-2 and the third vibration generating device 700-3. For example, the fourth vibration generating device 700-4 may be disposed separately from the second vibration generating device 700-2 and the third vibration generating device 700-3. For example, the second vibration generating device 700-2 may be disposed separately from the third vibration generating device 700-3. Since the first vibration generating device 700-1, the second vibration generating device 700-2, the third vibration generating device 700-3, and the fourth vibration generating device 700-4 are disposed separately from each other, the vibration area of ​​the display panel 100 may be increased. For example, in addition to the first vibration generating device 700-1, a second vibration generating device 700-2, a third vibration generating device 700-3, and a fourth vibration generating device 700-4 may be provided, and thus, the vibration sound PVS1 and / or the tactile feedback may be further enhanced. Therefore, since the first vibration generating device 700-1, the second vibration generating device 700-2, the third vibration generating device 700-3, and the fourth vibration generating device 700-4 are provided separately from each other, the left sound and the right sound may be output separately, thereby providing stereo sound or tactile feedback to the user.

[0337] As another example, the vibration generating device 700 may be disposed in a region where the heating temperature is high in the display device 30. For example, when the vibration generating device 700 is disposed at a lower portion relative to the center of the display device 30, the heat of the display device 30 may be cooled, thereby preventing the display panel 100 from being degraded due to the heat of the light emitting device layer included in the display panel 100.

[0338] As another example, in an image where the vibration generating device 700 is not driven as a sound generating device, heat generated in the display panel can be obtained as electricity by using the Seebeck effect of the third part, and thus, consumption of driving power of the vibration generating device 700 can be reduced.

[0339] As another example, when the vibration generating device 700 is implemented as a sound generating device, in an operation of reducing the volume of the sound, all of the first vibration generating device 700-1, the second vibration generating device 700-2, the third vibration generating device 700-3, and the fourth vibration generating device 700-4 may not be driven, and one of the first vibration generating device 700-1 and the fourth vibration generating device 700-4 may be driven, or one of the second vibration generating device 700-2 and the third vibration generating device 700-3 may be driven. Therefore, energy may be generated based on the vibration of one of the first vibration generating device 700-1 and the fourth vibration generating device 700-4, and the generated energy may be used to vibrate one of the second vibration generating device 700-2 and the third vibration generating device 700-3, thereby achieving energy collection.

[0340] As another example, when the vibration generating device 700 is implemented as a haptic device, the vibration generating device 700 may be driven, and when the vibration generating device 700 is not implemented as a haptic device, the vibration generating device 700 may not be driven. In this case, one or more of the first vibration generating device 700-1, the second vibration generating device 700-2, the third vibration generating device 700-3, and the fourth vibration generating device 700-4 of the vibration generating device 700 may each be implemented as a cooling device, and one or more of the first vibration generating device 700-1, the second vibration generating device 700-2, the third vibration generating device 700-3, and the fourth vibration generating device 700-4 that are not implemented as cooling devices may be implemented as collection devices, thereby reducing power consumption.

[0341] Fig.18 A display device according to another embodiment of the present disclosure is shown. Fig.19 A display device including a vibration generating apparatus according to another embodiment of the present disclosure is shown.

[0342] Reference Fig.18 and Fig.19 The vibration generating device 700 of the display device 40 according to another embodiment of the present disclosure may include a first vibration generating device 700-L and a second vibration generating device 700-R provided on the rear surface of the display panel 100. The vibration generating device 700 according to another embodiment of the present disclosure may include a first portion, a second portion, and a third portion, and may be configured as Figure 4A , Fig. 7A and Fig. 8A One of the vibration generating devices in. Fig.18 and Fig.19 For example, the description Figure 4A A vibration generating device in.

[0343] The rear surface (or back surface) of the display panel 100 may include a first area A1 and a second area A2. For example, the rear surface (or back surface) of the display panel 100 may be divided into the first area A1 and the second area A2. For example, the first area A1 may be a left area of ​​the rear surface of the display panel 100, and the second area A2 may be a right area of ​​the rear surface of the display panel 100. The first area A1 and the second area A2 may be laterally symmetrical with respect to the center line CL of the display panel 100 in the first direction X.

[0344] The first vibration generating device 700-L may be disposed in the first area A1 of the display panel 100. The first vibration generating device 700-L may vibrate the first area A1 of the display panel 100 to generate a first vibration sound PVS1 or a first tactile feedback in the first area A1 of the display panel 100. For example, the first vibration sound PVS1 may be a left sound.

[0345] The first vibration generating device 700-L may be disposed close to the central portion or the periphery of the display panel 100 in the first area A1 of the display panel 100 with respect to the first direction X. For example, the first vibration generating device 700-L may be disposed close to the first partition 610 or the second partition 620. The size of the first vibration generating device 700-L may have a size equal to or greater than half of the size of the first area A1, but the embodiment is not limited thereto and may be adjusted based on sound characteristics required for the display device.

[0346] The second vibration generating device 700-R may be disposed in the second area A2 of the display panel 100. The second vibration generating device 700-R may vibrate the second area A2 of the display panel 100 to generate a second vibration sound PVS2 or a second tactile feedback in the second area A2 of the display panel 100. For example, the second vibration sound PVS2 may be a right sound.

[0347] The second vibration generating device 700-R may be disposed close to the central portion or the periphery of the display panel 100 in the second area A2 of the display panel 100 with respect to the first direction X. For example, the second vibration generating device 700-R may be disposed close to the first partition 610 or the third partition 630. The size of the second vibration generating device 700-R may have a size equal to or greater than half of the size of the second area A2, but the embodiment is not limited thereto and may be adjusted based on sound characteristics required for the display device.

[0348] The first vibration generating device 700-L and the second vibration generating device 700-R according to an embodiment of the present disclosure may be used with Figure 4A , Fig. 7A and Fig. 8AThe vibration generating devices shown in FIG. 7 are substantially the same, and therefore, a repeated description thereof is omitted. For example, each of the first vibration generating device 700-L and the second vibration generating device 700-R may be configured as Figure 4A , Fig. 7A and Fig. 8A One of the vibration generating devices shown in .

[0349] The display device 40 according to the embodiment of the present disclosure may further include a partition 600 for dividing the first area A1 and the second area A2 of the display panel 100. The partition 600 may be an air gap or space that generates sound when the display panel 100 is vibrated by the first vibration generating device 700-L and the second vibration generating device 700-R. The air gap or space that generates or transmits sound may be referred to as a partition. The partition 600 may separate sounds or sound channels, and may prevent or reduce the generation of unclear sounds and sounds caused by sound interference. The partition 600 may be referred to as a closure or a baffle, but the term is not limited thereto.

[0350] The partition 600 according to the embodiment of the present disclosure may further include a fourth partition 640 and a fifth partition 650 disposed between the first vibration generating device 700 -L and the second vibration generating device 700 -R.

[0351] The fourth spacer 640 and the fifth spacer 650 may be disposed between the support member 300 and the portion of the display panel 100 corresponding to the central area of ​​the display panel 100. For example, the fourth spacer 640 and the fifth spacer 650 may be disposed in parallel between the support member 300 and the portion of the display panel 100 corresponding to the central area of ​​the display panel 100. The fourth spacer 640 and the fifth spacer 650 may separate the first vibration sound PVS1 and the second vibration sound PVS2 generated by the first vibration generating device 700-L and the second vibration generating device 700-R, respectively. For example, the fourth spacer 640 and the fifth spacer 650 may block the transmission of the vibration generated by the first vibration generating device 700-L in the first area A1 of the display panel 100 to the second area A2 of the display panel 100, or may block the transmission of the vibration generated by the second vibration generating device 700-R in the second area A2 of the display panel 100 to the first area A1 of the display panel 100. Therefore, the fourth partition 640 and the fifth partition 650 can attenuate or absorb the vibration of the display panel 100 at the center of the display panel 100, and thus can block the sound of the first area A1 from being transmitted to the second area A2, or can block the sound of the second area A2 from being transmitted to the first area A1. Therefore, the fourth partition 640 and the fifth partition 650 can separate the left sound and the right sound to further enhance the sound output characteristics of the display device 40, and therefore, the display device 40 according to the present disclosure can separate the left sound and the right sound by using the fourth partition 640 and the fifth partition 650 to output a two-channel stereo sound to the front area in front of the display panel 100.

[0352] For example, the partition 600 may include polyurethane, polyolefin, etc., but the embodiment is not limited thereto. As another example, the partition 600 may include a single-sided tape, a double-sided tape, a single-sided foam pad, a double-sided foam pad, a single-sided foam tape, and / or a double-sided foam tape, and may include, for example, a material having an elastic force capable of being compressed to a certain extent.

[0353] As another example, one of the fourth spacer 640 and the fifth spacer 650 may be omitted. For example, when the fifth spacer 650 of the fourth spacer 640 and the fifth spacer 650 is omitted, the fourth spacer 640 may be disposed between the supporting member 300 and the display panel 100 to correspond to the rear center line CL of the display panel 100. Even when one of the fourth spacer 640 and the fifth spacer 650 is disposed between the first vibration generating device 700-L and the second vibration generating device 700-R, left and right sounds may be separated from each other.

[0354] Therefore, the fourth partition 640 and the fifth partition 650 can separate the left sound and the right sound to further enhance the sound output characteristics of the display device 40. In addition, the display device 40 including the fourth partition 640 or the fifth partition 650 can separate the left sound and the right sound by using the fourth partition 640 or the fifth partition 650 to output a two-channel stereo sound to the front area in front of the display panel 100.

[0355] The spacer 600 according to the embodiment of the present disclosure may further include a first spacer 610 disposed between the display panel 100 and the support member 300 .

[0356] The first partition 610 may be disposed to surround the entirety of the first vibration generating device 700-L and the second vibration generating device 700-R. For example, the first partition 610 may be disposed along an area between the rear periphery of the display panel 100 and the front periphery of the support member 300. The first partition 610 may be referred to as an edge partition, a peripheral partition, a sound blocking member, an edge closure, a peripheral partition, or a baffle, but the term is not limited thereto. For example, the first partition 610 may be disposed to be adjacent to the first vibration generating device 700-L and the second vibration generating device 700-R. Figure 2 The illustrated connection member 400 is adjacent to or in contact with the connection member 400 and may be surrounded by the connection member 400. As another example, the first partition 610 may be provided integrally with the connection member 400.

[0357] The first spacer 610 may provide first to third air gaps AG1 to AG3 between the display panel 100 and the support member 300 together with the fourth spacer 640 or the fifth spacer 650. For example, each of the first to third air gaps AG1, AG2, and AG3 may be referred to as a vibration space, a sound pressure space, a sound box, a sound portion, a resonance box, or a resonance portion, but the term is not limited thereto.

[0358] The first air gap AG1 may be provided in the first area A1 of the display panel 100 surrounded by the fourth spacer 640 and the first spacer 610 provided in the first area A1 of the display panel 100 .

[0359] The second air gap AG2 may be provided in the second area A2 of the display panel 100 surrounded by the fifth spacer 650 and the first spacer 610 provided in the second area A2 of the display panel 100 .

[0360] The third air gap AG3 may be disposed in a central area of ​​the display panel 100 surrounded by the fourth and fifth partitions 640 and 650 and the first partition 610. For example, the third air gap AG3 may be disposed between the second air gap AG2 and the first air gap AG1 including the rear center line CL of the display panel 100. The third air gap AG3 may be referred to as a sound separation space, a sound blocking space, or a sound interference prevention space, but the term is not limited thereto. The third air gap AG3 may spatially separate the first air gap AG1 from the second air gap AG2, and thus may prevent a resonance phenomenon or an interference phenomenon that occurs in each of the first air gap AG1 and the second air gap AG2 and corresponds to a specific frequency band.

[0361] The first vibration generating device 700 -L may be surrounded by the first partition 610 and the second partition 620 providing the first air gap AG1 , and the second vibration generating device 700 -R may be surrounded by the first partition 610 and the third partition 630 providing the second air gap AG2 .

[0362] When one of the first partition 610 and the fourth partition 640 is omitted, the third air gap AG3 may be omitted.

[0363] Therefore, the first partition 610 can surround the side surface between the display panel 100 and the supporting member 300, and can individually surround each of the first vibration generating device 700-L and the second vibration generating device 700-R together with the second partition 620 and the third partition 630 to ensure the vibration space of each of the first vibration generating device 700-L and the second vibration generating device 700-R, thereby enhancing the sound pressure characteristics of the left sound and the right sound, and preventing the sound or sound pressure from leaking to the outside through the side surface between the display panel 100 and the supporting member 300, thereby further enhancing the sound output characteristics of the display device 40.

[0364] The partition 600 according to the embodiment of the present disclosure may further include a second partition 620 surrounding the first vibration generating device 700 -L and a third partition 630 surrounding the second vibration generating device 700 -R.

[0365] The second partition 620 may be disposed between the display panel 100 and the support member 300 to correspond to the first air gap AG1, and may surround the first vibration generating device 700-L. The second partition 620 according to an embodiment of the present disclosure may have a circular shape surrounding the first vibration generating device 700-L, but the embodiment is not limited thereto, and may have a shape that is the same as or different from the overall shape of the first vibration generating device 700-L. For example, when the first vibration generating device 700-L has a rectangular (e.g., quadrangular or square) shape, the second partition 620 may have a rectangular (e.g., quadrangular or square) shape whose size is relatively larger than that of the first vibration generating device 700-L.

[0366] The second partition 620 may limit (or define) the vibration region (or vibration region) of the display panel 100 based on the first vibration generating device 700-L. For example, in the first region A1 of the display panel 100, as the size of the second partition 620 increases, the vibration region of the first region A1 may increase, and thus, the low-pitched vocal cord characteristics of the left sound may be enhanced. On the other hand, in the first region A1 of the display panel 100, as the size of the second partition 620 decreases, the vibration region of the first region A1 may decrease, and thus, the high-pitched vocal cord characteristics of the left sound may be enhanced. Therefore, based on the vibration of the display panel 100, the size of the second partition 620 may be adjusted based on the desired vocal cord characteristics.

[0367] The third partition 630 may be disposed between the display panel 100 and the supporting member 300 to correspond to the second air gap AG2 and may surround the second vibration generating device 700-R. In order to make the left sound symmetrical with the right sound, the third partition 630 may have the same shape as that of the second partition 620 and a structure symmetrical to the second partition 620 with respect to the rear center line CL of the display panel 100, and therefore, description thereof is omitted.

[0368] The third partition 630 may limit (or define) the vibration region (or vibration region) of the display panel 100 based on the second vibration generating device 700-R. For example, in the second region A2 of the display panel 100, as the size of the third partition 630 increases, the vibration region of the second region A2 may increase, and thus, the low-pitched vocal cord characteristics of the right sound may be enhanced. On the other hand, in the second region A2 of the display panel 100, as the size of the third partition 630 decreases, the vibration region of the second region A2 may decrease, and thus, the high-pitched vocal cord characteristics of the right sound may be enhanced. Therefore, based on the vibration of the display panel 100, the size of the third partition 630 may be adjusted based on the desired vocal cord characteristics.

[0369] The second partition 620 and the third partition 630 may limit the vibration region (or vibration area) of each of the first vibration generating device 700-L and the second vibration generating device 700-R, and thus, the lateral symmetry of the left sound and the right sound generated based on the vibration of the display panel 100 may be enhanced, and the sound pressure characteristics and the reproduced sound cord of each of the left sound and the right sound may be optimized. As another example, when the second partition 620 and the third partition 630 are provided, the first partition 610 may be omitted. As another example, when the second partition 620 and the third partition 630 are provided, one of the first partition 610, the fourth partition 640, and the fifth partition 650 may be omitted.

[0370] Therefore, since the display device according to the embodiment of the present disclosure includes the partition 600, the sound pressure characteristics of each of the left sound and the right sound and the reproduced sound cord can be optimized. For example, the display device according to the embodiment of the present disclosure may include at least one of the fourth partition 640 and the fifth partition 650. As another example, the display device according to the embodiment of the present disclosure may include the first partition 610 and at least one of the fourth partition 640 and the fifth partition 650. As another example, the display device according to the embodiment of the present disclosure may include the first partition 610, the second partition 620, and the third partition 630. As another example, the display device according to the embodiment of the present disclosure may include the first partition 610, the second partition 620, the third partition 630, the fourth partition 640, and the fifth partition 650.

[0371] Therefore, the display device according to another embodiment of the present disclosure can output the left sound and the right sound to the front area FD in front of the display panel 100 through the first vibration generating device 700-L and the second vibration generating device 700-R to provide stereo sound to the user. In addition, the display device according to another embodiment of the present disclosure can separate the left sound and the right sound by using the partition 600 to output a two-channel stereo sound to the front area FD in front of the display panel 100.

[0372] FIG. 20A to FIG. 20C A display device according to another embodiment of the present disclosure is shown.

[0373] Reference FIG. 20A to FIG. 20C According to another embodiment of the present disclosure, a vibration generating device may include a first part, a second part, and a third part, and may be configured as Figure 4A , Fig. 7A and Fig. 8A In the following description, for example, the vibration generating device will be described Figure 4A A vibration generating device in.

[0374] Reference Fig. 20A , the vibration generating device 700 according to the embodiment of the present disclosure may be applied to a commercial display device or a flexible display device including a display panel 100 including a plurality of concave or convex curved surface portions CSP1 to CSP5. For example, the vibration generating device 700 may be implemented to be bent into a shape having a curvature value (or a curvature radius) matching a convex portion or a concave portion of each of the curved surface portions CSP1 to CSP5 of the display panel 100, and may be disposed in a convex portion or a concave portion of each of the curved surface portions CSP1 to CSP5 of the display panel 100. As another example, the vibration generating device 700 may be implemented to have a shape corresponding to a curvature value (or a curvature radius) of each of the curved surface portions CSP1 to CSP5 of the display panel 100, and may be disposed on the entire rear surface of the display panel 100.

[0375] Reference Fig. 20B , the vibration generating device 700 according to the embodiment of the present disclosure may be applied to a rollable display device including a display panel 100 wound or unwound in a spiral shape. For example, the vibration generating device 700 according to the embodiment of the present disclosure may be implemented to have a shape having a curvature value (or a curvature radius) of the display panel 100 wound or unwound in a spiral shape, and a plurality of vibration generating devices 700 may be arranged at certain intervals on the rear surface of the display panel 100. As another example, the vibration generating device 700 may be implemented to have a shape corresponding to the curvature value (or curvature radius) of the display panel 100, and may be provided on the entire rear surface of the display panel 100.

[0376] Reference Fig. 20C , the vibration generating device 700 according to the embodiment of the present disclosure may be applied to a wearable display device including a display panel 100 that is wrapped around a user's wrist and bent into a C-shape. For example, the vibration generating device 700 according to the embodiment of the present disclosure may be implemented to have a shape having a curvature value (or a curvature radius) of the display panel 100 bent into a C-shape, and a plurality of vibration generating devices 700 may be arranged at certain intervals on the rear surface of the display panel 100. As another example, the vibration generating device 700 may be implemented to have a shape corresponding to the curvature value (or a curvature radius) of the display panel 100 bent into a C-shape, and may be provided on the entire rear surface of the display panel 100.

[0377] The vibration generating device according to the embodiment of the present disclosure can be applied as a vibration generating device set in a display device. The display device according to the embodiment of the present disclosure can be applied to a mobile device, a video phone, a smart watch, a watch phone, a wearable device, a foldable device, a rollable device, a bendable device, a flexible device, a bending device, a portable multimedia player (PMP), a personal digital assistant (PDA), an electronic notepad, a desktop personal computer (PC), a laptop PC, a netbook computer, a workstation, a navigation device, a car navigation device, a car display device, a TV, a wallpaper display device, a sign device, a game console, a notebook computer, a monitor, a camera, a camcorder, a household appliance, etc. In addition, the vibration generating device according to the embodiment of the present disclosure can be applied to an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the vibration generating device or the sound generating device is applied to a lighting device, the vibration generating device or the sound generating device can be used as a lighting device and a speaker.

[0378] A display device according to an embodiment of the present disclosure will be described below.

[0379] A display device according to an embodiment of the present disclosure includes: a display panel, which is configured to display an image; and a vibration generating device, which is configured to vibrate the display panel, wherein the vibration generating device includes: a plurality of first parts, the plurality of first parts having piezoelectric properties; and a plurality of second parts, the plurality of second parts being arranged between the plurality of first parts to have flexibility.

[0380] According to some embodiments of the present disclosure, the vibration generating device may further include: a third portion, wherein the third portion is disposed adjacent to the plurality of second portions.

[0381] According to some embodiments of the present disclosure, AC driving may be performed on the first part and the second part, and DC driving may be performed on the third part.

[0382] According to some embodiments of the present disclosure, the third portion may be disposed between the plurality of second portions.

[0383] According to some embodiments of the present disclosure, the third portion may surround the plurality of first portions and the plurality of second portions.

[0384] According to some embodiments of the present disclosure, the display device may further include: a first electrode located on a lower surface of the vibration generating device; and a second electrode located on an upper surface of the vibration generating device.

[0385] According to some embodiments of the present disclosure, the vibration generating device may further include: a first protective layer, the first protective layer being located on the first electrode; and a second protective layer, the second protective layer being located on the second electrode.

[0386] According to some embodiments of the present disclosure, the display device may further include: a heat dissipation plate, the heat dissipation plate being located on a rear surface of the display panel, and the second electrode may be located on the rear surface of the heat dissipation plate.

[0387] According to some embodiments of the present disclosure, the first electrode may be a signal electrode, and the second electrode may be a ground electrode.

[0388] According to some embodiments of the present disclosure, the third portion may be a PN junction device.

[0389] According to some embodiments of the present disclosure, the display device may further include: a first electrode, which is located on the lower surface of the N-type device outside the third part; a second electrode, which is located on the upper surface of the P-type device outside the third part; and a third electrode, which is located on the lower surfaces of the N-type device and the P-type device.

[0390] According to some embodiments of the present disclosure, the display device may further include: a heat dissipation plate located on a rear surface of the display panel, and the third electrode may be disposed on the rear surface of the heat dissipation plate.

[0391] According to some embodiments of the present disclosure, each of the first part and the second part may be a vibration part, and the third part may be a heat dissipation part.

[0392] According to some embodiments of the present disclosure, the vibration generating device may be a sound generating device configured to vibrate the display panel to generate sound.

[0393] According to some embodiments of the present disclosure, the vibration generating device may be a haptic device configured to vibrate the display panel to output feedback based on a user's action.

[0394] According to some embodiments of the present disclosure, the display device may further include: a supporting member located on a rear surface of the display panel; and a connecting member located between the display panel and the supporting member.

[0395] According to some embodiments of the present disclosure, the supporting member may include: a rear surface portion, which covers the rear surface of the display panel and has a gap space between the rear surface portion and the rear surface of the display panel; and a side surface portion, which is connected to the periphery of the rear surface portion and covers the side surface of the display panel.

[0396] According to some embodiments of the present disclosure, the vibration generating device may be attached to the rear surface of the display panel by an adhesive member including a hollow portion between the display panel and the vibration generating device.

[0397] According to some embodiments of the present disclosure, the first portion may be formed partially of an inorganic material including an electroactive material, and the second portion may be formed partially of an organic material.

[0398] According to some embodiments of the present disclosure, the vibration generating device may be implemented using a membrane.

[0399] According to some embodiments of the present disclosure, the display device may further include: a first partition located between the display panel and the supporting member; and a second partition surrounding the vibration generating device.

[0400] According to some embodiments of the present disclosure, the vibration generating device may include: a first vibration generating device and a second vibration generating device, the first vibration generating device and the second vibration generating device being located on a rear surface of the display panel.

[0401] According to some embodiments of the present disclosure, the display panel may include: a plurality of curved surface portions that are concave or convex, and the vibration generating device may be disposed in a concave portion and a convex portion of each of the plurality of curved surface portions of the display panel.

[0402] According to some embodiments of the present disclosure, the display panel may be curved, and the vibration generating device may include a plurality of vibration generating devices arranged at intervals on a rear surface of the display panel.

[0403] A display device according to an embodiment of the present disclosure includes: a display panel configured to display an image; and a vibration generating device configured to vibrate the display panel, wherein the vibration generating device includes: a piezoelectric composite layer including a plurality of first parts and a plurality of second parts.

[0404] According to some embodiments of the present disclosure, the vibration generating device may further include: a component, wherein the component is disposed near the piezoelectric composite layer.

[0405] According to some embodiments of the present disclosure, AC driving may be performed on the piezoelectric composite layer, and DC driving may be performed on the member.

[0406] According to some embodiments of the present disclosure, the member may be disposed between adjacent portions of the piezoelectric composite layer to have a heat dissipation property.

[0407] According to some embodiments of the present disclosure, the component may be disposed outside the piezoelectric composite layer to have a heat dissipation property.

[0408] According to some embodiments of the present disclosure, the plurality of second portions may be disposed between the plurality of first portions.

[0409] According to some embodiments of the present disclosure, the display device may further include: a signal electrode located on a lower surface of the vibration generating device; and a ground electrode located on an upper surface of the vibration generating device.

[0410] According to some embodiments of the present disclosure, the vibration generating device may further include: a first protective layer, the first protective layer being located on the signal electrode; and a second protective layer, the second protective layer being located on the ground electrode.

[0411] According to some embodiments of the present disclosure, the display device may further include: a heat dissipation plate located on a rear surface of the display panel, wherein the ground electrode may be configured to contact the heat dissipation plate.

[0412] According to some embodiments of the present disclosure, the component may be a PN junction device.

[0413] According to some embodiments of the present disclosure, the display device may further include: a signal electrode, which is located on the upper surface of the N-type device outside the component; a ground electrode, which is located on the upper surface of the P-type device outside the component; and a connecting electrode, which is located on the lower surface of each of the N-type device and the P-type device to connect the PN junction device.

[0414] According to some embodiments of the present disclosure, the display device may further include: a heat dissipation plate, the heat dissipation plate being located on a rear surface of the display panel, and the connection electrode may be disposed on the rear surface of the heat dissipation plate.

[0415] According to some embodiments of the present disclosure, the vibration generating device is implemented as one or more of a sound generating device configured to vibrate the display panel to generate sound and a tactile device configured to vibrate the display panel to output feedback based on a user's action.

[0416] According to some embodiments of the present disclosure, the display device may further include: a supporting member located on a rear surface of the display panel; and a partition located between the display panel and the supporting member.

[0417] According to some embodiments of the present disclosure, the display device may further include: a partition surrounding the vibration generating device.

[0418] According to some embodiments of the present disclosure, the display device may further include: a supporting member located on the rear surface of the display panel; a first partition located between the display panel and the supporting member; and a second partition surrounding the vibration generating device.

[0419] According to some embodiments of the present disclosure, the vibration generating device may be attached to the rear surface of the display panel by an adhesive member including a hollow portion between the display panel and the vibration generating device.

[0420] According to some embodiments of the present disclosure, the plurality of first portions may be formed partially of an inorganic material including an electroactive material, and the plurality of second portions may be formed partially of an organic material.

[0421] According to some embodiments of the present disclosure, the vibration generating device may be implemented using a membrane.

[0422] According to some embodiments of the present disclosure, the vibration generating device may include: a first vibration generating device and a second vibration generating device, the first vibration generating device and the second vibration generating device being located on a rear surface of the display panel.

[0423] According to some embodiments of the present disclosure, the display panel may include: a plurality of curved surface portions that are concave or convex, and the vibration generating device may be disposed in a concave portion and a convex portion of each of the plurality of curved surface portions of the display panel.

[0424] According to some embodiments of the present disclosure, the display panel may be curved, and the vibration generating device may include a plurality of vibration generating devices arranged at intervals on a rear surface of the display panel.

[0425] According to an embodiment of the present disclosure, the method for manufacturing a vibration generating device includes the following steps: manufacturing an inorganic material mother substrate having piezoelectric properties through preprocessing; forming grooves or grooves between adjacent parts of the inorganic material mother substrate using a process of cutting or sawing the inorganic material mother substrate; filling the material of the third part into the grooves or grooves between the adjacent parts of the inorganic material mother substrate; forming a second groove or a second groove in each of the two sides of the material of the third part; filling the material of the second part into the second groove or the second groove; and forming the first part, the second part and the third part of the vibration generating device through a grinding process or a cutting process.

[0426] According to an embodiment of the present disclosure, a method for manufacturing a vibration generating device includes the following steps: manufacturing an inorganic material mother substrate having piezoelectric properties through preprocessing; forming an area between adjacent parts of the inorganic material mother substrate by using a process of cutting or sawing the inorganic material mother substrate; filling the material of the third part into the area formed in the inorganic material mother substrate; forming a groove or a trench between the material of the third part and the inorganic material mother substrate by using an etching process; filling the material of the second part into the groove or the trench; and forming the first part, the second part and the third part of the vibration generating device through a grinding process or a cutting process.

[0427] The display device according to an embodiment of the present disclosure may include a vibration generating device for vibrating the display panel, and may therefore be implemented using a sound generating device and / or a tactile device that outputs feedback based on the user's actions, wherein the sound generating device generates sound so that the direction of travel of the sound of the display device is toward the front surface of the display panel.

[0428] A display device according to an embodiment of the present disclosure may include a vibration generating device including a heat dissipation unit, thereby providing a display device having excellent vibration characteristics and heat dissipation performance.

[0429] In the display device according to the embodiment of the present disclosure, the vibration generating means can be implemented with one film without damaging elements constituting the vibration generating means.

[0430] It is obvious to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the technical concept or scope of the present disclosure. Therefore, the embodiments of the present disclosure may be intended to cover modifications and variations of the present disclosure as long as they fall within the scope of the attached claims and their equivalents.

[0431] CROSS-REFERENCE TO RELATED APPLICATIONS

[0432] This application claims the benefit of and priority to Korean Patent Application No. 10-2019-0163044, filed on Dec. 9, 2019, which is hereby incorporated by reference in its entirety as if fully set forth herein.

Claims

1. A display device, the display device include: a display panel, the display panel being configured to display an image; as well as a vibration generating device configured to vibrate the display panel, Wherein, the vibration generating device comprises: a plurality of first portions, the plurality of first portions having piezoelectric properties; a plurality of second parts, the plurality of second parts having flexibility and disposed between the plurality of first parts; and a third portion, the third portion being disposed near the plurality of second portions, wherein DC driving is performed on the third portion, and Wherein, AC driving is performed on the first part and the second part.

2. The display device according to claim 1, in, The third portion is disposed between the plurality of second portions.

3. The display device according to claim 1, in, The third portion surrounds the plurality of first portions and the plurality of second portions.

4. The display device according to claim 1, wherein the display device further comprises: include: a first electrode, the first electrode being located on a lower surface of the vibration generating device; as well as A second electrode, the second electrode is located on an upper surface of the vibration generating device.

5. The display device according to claim 4, in, The vibration generating device further comprises: a first protective layer, the first protective layer being located on the first electrode; and A second protective layer is located on the second electrode.

6. The display device according to claim 4, further comprising: include: a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel, Wherein, the second electrode is located on the rear surface of the heat dissipation plate.

7. The display device according to claim 4, in, The first electrode is a signal electrode, and the second electrode is a ground electrode.

8. The display device according to claim 1, in, The third part is a PN junction device.

9. The display device according to claim 8, wherein the display device further comprises: include: a first electrode, the first electrode being located on a lower surface of the N-type device outside the third portion; a second electrode, the second electrode being located on an upper surface of the P-type device outside the third portion; as well as A third electrode is located on the lower surface of the N-type device and the P-type device.

10. The display device according to claim 9, further comprising: include: a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel, Wherein, the third electrode is arranged on the rear surface of the heat dissipation plate.

11. The display device according to claim 1, in, Each of the first portion and the second portion is a vibration portion, and the third portion is a heat dissipation portion.

12. The display device according to claim 1, in, The vibration generating device is a sound generating device configured to vibrate the display panel to generate sound.

13. The display device according to claim 1, in, The vibration generating device is a haptic device configured to vibrate the display panel to output feedback based on a user's action.

14. The display device according to claim 1, further comprising: include: a supporting member, the supporting member being located on a rear surface of the display panel; as well as A connecting member is located between the display panel and the supporting member.

15. The display device according to claim 14, in, The supporting member comprises: a rear surface portion covering the rear surface of the display panel with a gap space between the rear surface portion and the rear surface of the display panel; and A side surface portion is connected to an outer circumference of the rear surface portion and covers a side surface of the display panel.

16. The display device according to claim 1, in, The vibration generating device is attached to a rear surface of the display panel through an adhesive member, and the adhesive member includes a hollow portion between the display panel and the vibration generating device.

17. The display device according to claim 1, in, The first portion is formed partially of an inorganic material comprising an electroactive material, and the second portion is formed partially of an organic material.

18. The display device according to claim 1, in, The vibration generating device is implemented using a membrane.

19. The display device according to claim 14, further comprising: include: a first partition located between the display panel and the supporting member; as well as A second partition surrounds the vibration generating device.

20. The display device according to claim 1, in, The vibration generating device comprises: A first vibration generating device and a second vibration generating device, the first vibration generating device and the second vibration generating device are located on a rear surface of the display panel.

21. The display device according to claim 1, in, The display panel comprises: Multiple curved parts, concave or convex, Wherein, the vibration generating device is disposed in a concave portion or a convex portion of each of the plurality of curved surface portions of the display panel.

22. The display device according to claim 1, in, The display panel is curved, and the vibration generating device includes a plurality of vibration generating devices arranged at intervals on a rear surface of the display panel.

23. A display device, the display device include: a display panel, the display panel being configured to display an image; as well as a vibration generating device configured to vibrate the display panel, Wherein, the vibration generating device comprises: A piezoelectric composite layer, the piezoelectric composite layer comprising a plurality of first portions and a plurality of second portions; A component, wherein the component is arranged near the piezoelectric composite layer, wherein a DC drive is performed on the component, and Wherein, AC driving is performed on the piezoelectric composite layer.

24. The display device according to claim 23, in, The member has heat dissipation properties and is disposed between adjacent portions of the piezoelectric composite layer.

25. The display device according to claim 23, in, The component has heat dissipation characteristics and is disposed outside the piezoelectric composite layer.

26. The display device according to claim 23, in, The plurality of second portions are disposed between the plurality of first portions.

27. The display device according to claim 23, wherein the display device further comprises: include: a signal electrode, the signal electrode being located on a lower surface of the vibration generating device; as well as A ground electrode is located on an upper surface of the vibration generating device.

28. The display device according to claim 27, in, The vibration generating device further comprises: a first protective layer, the first protective layer being located on the signal electrode; and A second protective layer is located on the ground electrode.

29. The display device according to claim 27, wherein the display device further comprises: include: a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel, Wherein, the ground electrode is configured to contact the heat sink.

30. The display device according to claim 23, in, The component is a PN junction device.

31. The display device according to claim 30, wherein the display device further comprises: include: A signal electrode, the signal electrode being located on an upper surface of the N-type device outside the component; A ground electrode, the ground electrode being located on an upper surface of the P-type device outside the component; as well as A connecting electrode is located on a lower surface of each of the N-type device and the P-type device to connect the PN junction device.

32. The display device according to claim 31, further comprising: include: a heat dissipation plate, the heat dissipation plate being located on the rear surface of the display panel, Wherein, the connecting electrode is arranged on the rear surface of the heat dissipation plate.

33. The display device according to claim 23, in, The vibration generating device is implemented to have one or more of a sound generating device configured to vibrate the display panel to generate sound and a haptic device configured to vibrate the display panel to output feedback based on a user's action.

34. The display device according to claim 23, further comprising: include: a supporting member, the supporting member being located on a rear surface of the display panel; as well as A partition is located between the display panel and the support member.

35. The display device according to claim 23, further comprising: include: A partition surrounds the vibration generating device.

36. The display device according to claim 23, further comprising: include: a supporting member, the supporting member being located on a rear surface of the display panel; a first partition located between the display panel and the supporting member; as well as A second partition surrounds the vibration generating device.

37. The display device according to claim 23, in, The vibration generating device is attached to a rear surface of the display panel through an adhesive member, and the adhesive member includes a hollow portion between the display panel and the vibration generating device.

38. The display device according to claim 23, in, The plurality of first portions are formed partially of an inorganic material including an electroactive material, and the plurality of second portions are formed partially of an organic material.

39. The display device according to claim 23, in, The vibration generating device is implemented using a membrane.

40. The display device according to claim 23, in, The vibration generating device comprises: A first vibration generating device and a second vibration generating device, the first vibration generating device and the second vibration generating device are located on a rear surface of the display panel.

41. The display device according to claim 23, in, The display panel comprises: Multiple curved parts, concave or convex, Wherein, the vibration generating device is disposed in a concave portion or a convex portion of each of the plurality of curved surface portions of the display panel.

42. The display device according to claim 23, in, The display panel is curved, and the vibration generating device includes a plurality of vibration generating devices arranged at intervals on a rear surface of the display panel.

43. A method of manufacturing a vibration generating device, the method The following steps are involved: Manufacturing an inorganic material mother substrate having piezoelectric properties through pretreatment; forming grooves between adjacent portions of the inorganic material mother substrate using a process of cutting the inorganic material mother substrate; Filling the third portion of material into the groove between the adjacent portions of the inorganic material mother substrate; forming a second groove in each of two sides of the material of the third portion; filling the second portion of material into the second groove; as well as The first part, the second part and the third part of the vibration generating device are formed by a grinding process or a cutting process, wherein DC driving is performed on the third portion, and Wherein, AC driving is performed on the first part and the second part.

44. A method of manufacturing a vibration generating device, the method The following steps are involved: Manufacturing an inorganic material mother substrate having piezoelectric properties through pretreatment; forming a region between adjacent portions of the inorganic material mother substrate by using a process of cutting the inorganic material mother substrate; filling the third portion of material into the region formed in the inorganic material mother substrate; forming a groove between the material of the third portion and the inorganic material mother substrate by using an etching process; filling the groove with a second portion of material; as well as The first part, the second part and the third part of the vibration generating device are formed by a grinding process or a cutting process, wherein DC driving is performed on the third portion, and Wherein, AC driving is performed on the first part and the second part.

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