Device with a vibrating plate

Abstract

A device with a vibrating plate is disclosed. The device includes: a vibrating plate; and a sound generating device located on the rear surface of the vibrating plate, wherein the sound generating device includes: a vibration generating device; a circuit board located on the lower surface of the vibration generating device; a first adhesive member located between the circuit board and the vibration generating device; and a second adhesive member located between the vibration generating device and the vibrating plate, and the elastic modulus of the first adhesive member is greater than that of the second adhesive member.

Description

[0001] This application is a divisional application of the patent application for invention with the original application number 201911182938.9 (filing date: November 27, 2019, invention title: Sound generation module and display device).

[0002] Cross-reference to related applications

[0003] This application claims the benefit and priority of Korean Patent Application No. 10-2018-0166356, filed on December 20, 2018, which is hereby incorporated by reference in its entirety. Technical field

[0004] The present disclosure relates to a display device. Background art

[0005] Display devices are equipped in home appliances or electronic devices such as televisions (TVs), monitors, laptop computers, smartphones, tablet computers, electronic notebooks, electronic boards, wearable devices, watch phones, portable information devices, navigation devices, and automotive control display devices, and are used as screens for displaying images. The display device includes a display panel for displaying an image and a sound device for outputting sound associated with the image.

[0006] Recently, in display devices, there has been a trend to enlarge the screen, but the requirements for weight reduction and thinning are increasing. However, since the display device should include sufficient space in which a sound device such as a speaker for outputting sound is embedded, it is difficult to reduce weight and thinness. In the case where the sound device is configured with a piezoelectric member capable of being thinned, the sound device is easily damaged by external shocks. In addition, the sound generated by the sound device embedded in the display device is output in a backward direction or a lateral direction with respect to the main body of the display device rather than in a forward direction with respect to the display panel, and thus does not travel toward the viewer (or user) who is viewing an image in front of the display device, thereby disturbing the immersion of the viewer viewing the image. Summary of the invention

[0007] Accordingly, embodiments of the present disclosure are directed to providing a display device that substantially eliminates one or more problems caused by the limitations and disadvantages of the prior art.

[0008] Accordingly, the present inventors have recognized the above problems and have conducted various experiments such that when viewing an image in front of the display panel, the traveling direction of sound becomes a direction toward the front surface of the display panel, and the durability against external shocks is improved. Through various experiments, the present inventors have achieved a display device having a new structure that outputs sound having a traveling direction toward the front surface of the display panel and is improved in durability against external shocks.

[0009] One aspect of the present disclosure provides a display device that vibrates a display panel to output sound to a front region in front of the display panel and is improved in durability against external shocks.

[0010] Additional features and aspects will be set forth in the following description, and in part will be apparent from the description, or may be learned by practice of the inventive concept provided herein. Other features and aspects of the inventive concept may be realized and obtained by the structure particularly pointed out in the written description or derivable therefrom, as well as the claims and the drawings.

[0011] To achieve these and other aspects of the inventive concept as specifically implemented and generally described herein, a display device includes: a display module including a display panel configured to display an image; and a first sound generating module located on a rear surface of the display panel, wherein the first sound generating module includes: a first vibration generating device; a circuit board located on a lower surface of the first vibration generating device; a first bonding member located between the circuit board and the first vibration generating device; and a second bonding member located between the first vibration generating device and the display panel, the second bonding member having an elastic modulus different from that of the first bonding member.

[0012] In another aspect, a display device includes: a display module including a display panel configured to display an image; and a first sound generating module located on a rear surface of the display panel, wherein the first sound generating module includes: a first vibration generating device; a circuit board located on a lower surface of the first vibration generating device; a first bonding member and a third bonding member located between the circuit board and the first vibration generating device; and a member located between the first bonding member and the third bonding member.

[0013] In another aspect, a sound generating module applied to a display device including a display panel, the sound generating module being disposed on a rear surface of the display panel, the sound generating module including: a vibration generating device; a circuit board located on a lower surface of the vibration generating device; a first bonding member located between the circuit board and the vibration generating device; and a second bonding member located between the vibration generating device and the display panel, the elastic modulus of the second bonding member being different from the elastic modulus of the first bonding member.

[0014] In another aspect, a sound generating module applied to a display device including a display panel, the sound generating module being disposed on a rear surface of the display panel, the sound generating module including: a vibration generating device; a circuit board located on a lower surface of the vibration generating device; a first bonding member and a third bonding member located between the circuit board and the vibration generating device; and a member located between the first bonding member and the third bonding member.

[0015] Other systems, methods, features, and advantages will be or will become apparent to those of ordinary skill in the art having studied the following figures and detailed description. All such additional systems, methods, features, and advantages are intended to be included within this specification, within the scope of the present disclosure, and are protected by the following claims. Nothing in this section should be taken as a limitation on those claims. Additional aspects and advantages are discussed below in conjunction with embodiments of the present disclosure. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the present disclosure as claimed.

[0016] Appendix 1. A display device, the display device including:

[0017] a display module including a display panel configured to display an image; and

[0018] a first sound generating module located on a rear surface of the display panel,

[0019] wherein the first sound generating module includes:

[0020] a first vibration generating device;

[0021] a circuit board located on a lower surface of the first vibration generating device;

[0022] a first bonding member located between the circuit board and the first vibration generating device; and

[0023] A second adhesive member, which is located between the first vibration generating device and the display panel, and the elastic modulus of the second adhesive member is different from that of the first adhesive member.

[0024] Supplementary Note 2. The display device according to Supplementary Note 1, wherein the elastic modulus of the first adhesive member is greater than that of the second adhesive member.

[0025] Supplementary Note 3. The display device according to Supplementary Note 1, wherein the first adhesive member includes a material having conductivity.

[0026] Supplementary Note 4. The display device according to Supplementary Note 1, wherein the size of the circuit board is the same as that of the first vibration generating device.

[0027] Supplementary Note 5. The display device according to Supplementary Note 1, wherein the circuit board includes:

[0028] A base film, which is located on the lower surface of the first vibration generating device;

[0029] A first electrode and a second electrode, which are respectively located on the upper surface and the lower surface of the base film; and

[0030] A passivation layer, which is located on each of the upper surface and the lower surface of the base film.

[0031] Supplementary Note 6. The display device according to Supplementary Note 5, wherein the base film includes a flexible printed circuit board, and the flexible printed circuit board includes polyimide.

[0032] Supplementary Note 7. The display device according to Supplementary Note 1, wherein

[0033] The display panel includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and

[0034] The distance between the center of the first vibration generating device and the first short side of the display panel is 1 / 4 to 1 / 3 of the long side of the display panel.

[0035] Supplementary Note 8. The display device according to Supplementary Note 1, further including a second sound generating module located on the rear surface of the display panel, and the second sound generating module includes a second vibration generating device.

[0036] Supplementary Note 9. The display device according to Supplementary Note 8, wherein

[0037] The display panel includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and

[0038] The distance between the center of the second vibration generating device and the second short side of the display panel is 1 / 4 to 1 / 3 of the long side of the display panel.

[0039] Supplementary Note 10. The display device according to Supplementary Note 8, wherein the first sound generating module is symmetric with respect to the central portion of the display module and the second sound generating module.

[0040] Supplementary Note 11. The display device according to Supplementary Note 8, wherein

[0041] The display panel includes:

[0042] A first short side;

[0043] A second short side facing the first short side;

[0044] A long side perpendicular to the first short side or the second short side;

[0045] A first longitudinal direction and a second longitudinal direction that divide the first short side or the second short side into three equal parts; and

[0046] A first transverse direction and a second transverse direction that divide the long side into three equal parts,

[0047] wherein the first sound generating module is located in the area divided by the second longitudinal direction and the first transverse direction or in the area divided by the first longitudinal direction and the first transverse direction, and

[0048] wherein the second sound generating module is located in the area divided by the first longitudinal direction and the second transverse direction or in the area divided by the second longitudinal direction and the second transverse direction.

[0049] Supplementary Note 12. The display device according to Supplementary Note 8, wherein each of the first vibration generating device and the second vibration generating device includes a piezoelectric material layer.

[0050] Supplementary Note 13. The display device according to Supplementary Note 8, further comprising a spacer disposed at the central portion of the rear surface of the display module.

[0051] Supplementary Note 14. The display device according to Supplementary Note 13, wherein

[0052] The display module includes a first rear area overlapping with the first sound generating module and a second rear area overlapping with the second sound generating module; and

[0053] The spacer is located between the first rear region and the second rear region.

[0054] Supplementary Note 15. A display device, the display device comprising:

[0055] A display module, the display module including a display panel configured to display an image; and

[0056] A first sound generating module, the first sound generating module being located on the rear surface of the display panel,

[0057] wherein the first sound generating module includes:

[0058] A first vibration generating device;

[0059] A circuit board, the circuit board being located on the lower surface of the first vibration generating device;

[0060] A first adhesive member and a third adhesive member, the first adhesive member and the third adhesive member being located between the circuit board and the first vibration generating device; and

[0061] A member located between the first adhesive member and the third adhesive member.

[0062] Supplementary Note 16. The display device according to Supplementary Note 15, wherein the material of the first adhesive member is different from the material of the third adhesive member.

[0063] Supplementary Note 17. The display device according to Supplementary Note 15, the display device further including at least one electrode located on the lower surface of the first vibration generating device,

[0064] wherein the third adhesive member is located on the at least one electrode.

[0065] Supplementary Note 18. The display device according to Supplementary Note 15, the display device further including a second adhesive member located between the first vibration generating device and the display panel.

[0066] Supplementary Note 19. The display device according to Supplementary Note 18, wherein the elastic modulus of the second adhesive member is different from the elastic modulus of the first adhesive member.

[0067] Supplementary Note 20. The display device according to Supplementary Note 15, wherein the size of the circuit board is the same as the size of the first vibration generating device.

[0068] Supplementary Note 21. The display device according to Supplementary Note 15, wherein the circuit board includes:

[0069] A substrate film, which is located on the lower surface of the first vibration generating device;

[0070] A first electrode and a second electrode, which are respectively located on the upper surface and the lower surface of the substrate film; and

[0071] A passivation layer, which is located on each of the upper surface and the lower surface of the substrate film.

[0072] Note 22. The display device according to Note 21, wherein each of the first electrode and the second electrode is attached to the lower surface of the first vibration generating device through the third bonding member.

[0073] Note 23. The display device according to Note 21, wherein the first bonding member is located between the passivation layer on the upper surface of the substrate film and the first vibration generating device.

[0074] Note 24. The display device according to Note 15, further comprising a fourth bonding member located between the circuit board and the member.

[0075] Note 25. The display device according to Note 15, wherein

[0076] the display panel includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and

[0077] the distance between the center of the first vibration generating device and the first short side of the display panel is 1 / 4 to 1 / 3 of the long side of the display panel.

[0078] Note 26. The display device according to Note 15, further comprising a second sound generating module located on the rear surface of the display panel, and the second sound generating module includes a second vibration generating device.

[0079] Note 27. The display device according to Note 26, wherein

[0080] the display panel includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and

[0081] the distance between the center of the second vibration generating device and the second short side of the display panel is 1 / 4 to 1 / 3 of the long side of the display panel.

[0082] Note 28. The display device according to Note 26, wherein the first sound generating module is symmetric with the second sound generating module with respect to the central portion of the display module.

[0083] Supplementary Note 29. The display device according to Supplementary Note 26, wherein,

[0084] the display panel includes:

[0085] a first short side;

[0086] a second short side facing the first short side;

[0087] a long side perpendicular to the first short side or the second short side;

[0088] a first longitudinal direction and a second longitudinal direction that divide the first short side or the second short side into three equal parts; and

[0089] a first transverse direction and a second transverse direction that divide the long side into three equal parts,

[0090] wherein, the first sound generating module is located in the area divided by the second longitudinal direction and the first transverse direction or in the area divided by the first longitudinal direction and the first transverse direction, and

[0091] wherein, the second sound generating module is located in the area divided by the first longitudinal direction and the second transverse direction or in the area divided by the second longitudinal direction and the second transverse direction.

[0092] Supplementary Note 30. The display device according to Supplementary Note 26, the display device further includes a spacer disposed at the central portion of the rear surface of the display module.

[0093] Supplementary Note 31. The display device according to Supplementary Note 30, wherein,

[0094] the display module includes a first rear area overlapping with the first sound generating module and a second rear area overlapping with the second sound generating module; and

[0095] the spacer is located between the first rear area and the second rear area.

[0096] Supplementary Note 32. A sound generating module applied to a display device including a display panel, the sound generating module is disposed on the rear surface of the display panel, the sound generating module includes:

[0097] a vibration generating device;

[0098] a circuit board located on the lower surface of the vibration generating device;

[0099] A first adhesive member located between the circuit board and the vibration generating device; and

[0100] A second adhesive member located between the vibration generating device and the display panel, the elastic modulus of the second adhesive member being different from that of the first adhesive member.

[0101] Note 33. A sound generating module applied to a display device including a display panel, the sound generating module being disposed on a rear surface of the display panel, the sound generating module including:

[0102] A vibration generating device;

[0103] A circuit board located on a lower surface of the vibration generating device;

[0104] A first adhesive member and a third adhesive member located between the circuit board and the vibration generating device; and

[0105] A member located between the first adhesive member and the third adhesive member.

[0106] Note 34. The sound generating module according to any one of Notes 1, 15, 32, and 33, wherein the circuit board serves as a reinforcing member of the sound generating module.

[0107] Note 35. The sound generating module according to any one of Notes 1, 15, 32, and 33, wherein the circuit board is formed of a polyimide-based material. Brief Description of the Drawings

[0108] The drawings may be included to provide a further understanding of the present disclosure and are incorporated into and constitute a part of the present disclosure. The drawings illustrate embodiments of the present disclosure and, together with the description, are used to explain various principles of the present disclosure.

[0109] Figure 1 is a perspective view of a display device illustrating an embodiment of the present disclosure.

[0110] Figure 2 is a cross-sectional view taken along line I-I' illustrated in Figure 1 is a cross-sectional view taken along line I-I' illustrated in

[0111] Figure 3 illustrates a simulation result of strain energy density in a sound generating module according to an embodiment of the present disclosure.

[0112] Figure 4A and Figure 4B are diagrams illustrating a sound generating module according to an embodiment of the present disclosure.

[0113] Figure 5 is a diagram illustrating height and sound pressure level during an impact test performed on a sound generation module according to an embodiment of the present disclosure.

[0114] Figure 6 is a cross-sectional view taken along the I-I' line illustrated in Figure 1 according to another embodiment of the present disclosure.

[0115] Figure 7 is a cross-sectional view taken along the I-I' line illustrated in Figure 1 according to another embodiment of the present disclosure.

[0116] Figure 8A 、 Figure 8B and Figure 8C is a detailed view of Figure 7 according to another embodiment of the present disclosure.

[0117] Figure 9 is a rear view of a display device according to another embodiment of the present disclosure.

[0118] Figure 10 is a perspective view of a display device illustrating another embodiment of the present disclosure.

[0119] Figure 11 is a cross-sectional view taken along the II-II' line illustrated in Figure 10 according to another embodiment of the present disclosure.

[0120] Figure 12 is a cross-sectional view taken along the II-II' line illustrated in Figure 10 according to another embodiment of the present disclosure.

[0121] Figure 13 illustrates a rear view of a display panel according to another embodiment of the present disclosure.

[0122] Figure 14 illustrates a rear view of a display panel according to another embodiment of the present disclosure.

[0123] Figure 15A and Figure 15B are rear views of a display panel according to another embodiment of the present disclosure.

[0124] Figure 16A and Figure 16B are rear views of a display panel according to another embodiment of the present disclosure.

[0125] Figure 17 illustrates the sound output characteristics of a sound generation module according to an embodiment of the present disclosure.

[0126] Figure 18A and Figure 18B illustrate the sound output characteristics of a sound generation module according to an embodiment of the present disclosure.

[0127] Figure 19A and Figure 19B illustrate the sound output characteristics of a sound generation module according to an embodiment of the present disclosure.

[0128] Figure 20A and Figure 20B illustrate the sound output characteristics of a sound generation module according to an embodiment of the present disclosure.

[0129] Throughout the drawings and the 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 dimensions of these elements may be enlarged and depicted. Detailed Description

[0130] Now, embodiments of the present disclosure will be described in detail, and examples thereof are illustrated in the drawings. In the following description, when a detailed description of well-known functions or configurations related to this document is determined to unnecessarily obscure the gist of the inventive concept, its detailed description will be omitted. The progress of the described processing steps and / or operations is an example; however, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as known in the art, except when the steps and / or operations must occur in a specific order. The same reference numerals designate similar elements throughout. The names of the respective elements used in the following description are chosen only for the convenience of writing this specification and may thus be different from those used in actual products.

[0131] The advantages and features of the present disclosure and a method for implementing the same will be clarified by the following embodiments described with reference to the drawings. However, the present disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is defined only by the scope of the claims.

[0132] The shapes, sizes, ratios, angles, and quantities disclosed in the accompanying drawings used to describe the embodiments of the present disclosure are merely examples. Therefore, the present disclosure is not limited to the details illustrated. In the following description, when the detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present disclosure, the detailed description of such known functions or configurations may be omitted. When using the terms "comprising", "having", and "including" described in this specification, another part may be added unless a more restrictive term, such as "only", is used. Unless otherwise cited, terms in the singular form may include the plural form.

[0133] When constructing an element, the element is interpreted to include an error or tolerance range even without an explicit description of such an error or tolerance range.

[0134] When describing the positional relationship when the positional relationship between two parts is described as "on", "above", "below", and "adjacent to", one or more other parts may be provided between the two parts unless a more restrictive term, such as "exactly" or "directly", is used.

[0135] When describing a time relationship, for example, when the time order is described as "after", "subsequently", "next", and "before", a discontinuous situation may be included unless a more restrictive term, such as "exactly", "immediately", or "directly", is used.

[0136] It should be understood that although the terms "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element without departing from the scope of the present disclosure.

[0137] When describing the elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)", and "(b)" can be used. Such terms are used only to distinguish the corresponding elements from other elements, and the corresponding elements are not limited by these terms in terms of their nature, order, or priority. It should be understood that when an element or layer is referred to as being "on" another element or layer or "connected to" another element or layer, it can be directly on or directly connected to another element or layer, or there may be intermediate elements or layers. Additionally, it should be understood that when an element is disposed on or below another element, this may indicate a case where the elements are disposed in direct contact with each other, but it may also indicate a case where the elements are disposed without direct contact with each other.

[0138] The term "at least one" should be understood to include any and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of the first item, the second item, and the third item" means all items taken two or more at a time from the first item, the second item, and the third item, as well as combinations of the first item, the second item, or the third item.

[0139] In the description of an embodiment, when a structure is described as being located "on or above" or "below or beneath" another structure, such description should be interpreted to include cases where the structures are in contact with each other and cases where a third structure is disposed therebetween. The size and thickness of each element shown in the drawings are given solely for convenience of description and, unless otherwise specified, embodiments of the present disclosure are not limited thereto.

[0140] Features of various embodiments of the present disclosure may be partially or wholly coupled to each other or combined with each other, and may interoperate differently from each other and be technically driven as will be fully understood by those skilled in the art. Embodiments of the present disclosure may be executed independently of each other or may be executed together in accordance with a dependency relationship.

[0141] In the present disclosure, examples of a display device may include a narrow-sense display device, such as an organic light-emitting display (OLED) module or a liquid crystal module (LCM) including a display panel and a driver for driving the display panel. Additionally, examples of a display device may include a set of devices (or a set of equipment) or a set of electronic devices such as a notebook computer, a TV, a computer monitor, equipment including automotive equipment for a vehicle or another type of equipment, or a mobile electronic device such as a smart phone or an electronic board, which is a complete product (or a final product) including an LCM or an OLED module.

[0142] Therefore, in the present disclosure, examples of a display device may include a narrow-sense display device itself, such as an LCM or an OLED module, and a set of devices as a final consumer device or an application product including an LCM or an OLED module.

[0143] In some embodiments, an LCM or an OLED module including a display panel and a driver may be referred to as a narrow-sense display device, while an electronic device as a final product including an LCM or an OLED module may be referred to as a set of devices. For example, the narrow-sense display device may include a display panel, such as an LCD or an OLED, and a source printed circuit board (PCB) as a controller for driving the display panel. The set of devices may also include a set of PCBs as a set of controllers electrically connected to the source PCB to overall control the set of devices.

[0144] The display panel applied to this embodiment can use any type of display panel, such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and an electroluminescent display panel, but is not limited to a specific display panel that vibrates through the sound generating device according to the embodiments of the present disclosure. Additionally, the shape or size of the display panel applied to the display device according to the embodiments of the present disclosure is not limited.

[0145] 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 respectively located in a plurality of pixel regions defined by the intersections of the gate lines and the data lines. Additionally, the display panel may include: an array substrate including thin film transistors (TFTs) as switching elements for adjusting the light transmittance of each of the plurality of pixels; an upper substrate including a color filter and / or a black matrix; and a liquid crystal layer located between the array substrate and the upper substrate.

[0146] Furthermore, 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 respectively disposed in a plurality of pixel regions defined by the intersections of the gate lines and the data lines. Additionally, the display panel may include: an array substrate including TFTs as elements for selectively applying a voltage to each pixel; an organic light emitting device layer located on the array substrate; and a packaging substrate disposed on the array substrate to cover the organic light emitting device layer. The packaging substrate can protect the TFTs and the organic light emitting device layer from external impacts and can prevent water or oxygen from penetrating into the organic light emitting device layer. Additionally, the layer disposed on the array substrate may include an inorganic light emitting layer (e.g., a nano-sized material layer, quantum dots, etc.). As another example, the layer disposed on the array substrate may include micro light emitting diodes.

[0147] The display panel may further include a backplane, such as a metal plate attached to the display panel. However, the embodiment is not limited to a metal plate, and the display panel may include another structure.

[0148] In the present disclosure, the display panel can be applied to a vehicle as a user interface module such as a central control panel for a vehicle. For example, the display panel can be disposed between the occupants sitting on two front seats so that the vibration of the display panel is transmitted to the interior of the vehicle. Therefore, the audio experience in the vehicle is improved compared to the case where speakers are disposed inside the vehicle.

[0149] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0150] Figure 1is a perspective view illustrating a display device according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view taken along the Figure 1 I-I' line illustrated in

[0151] Refer to Figure 1 and Figure 2 According to an embodiment of the present disclosure, the display device 10 may include a display module 100, a support member 300, and a sound generation module 400.

[0152] The display module 100 may include a display panel 110. The display panel 110 may display an image, such as an electronic image or a digital image, and may be implemented as any type of display panel, such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, an electroluminescent display panel, etc. The display panel 110 may vibrate based on the vibration of the sound generation module 400 to output sound in a forward direction with respect to the display panel 110.

[0153] For example, the display panel 110 may be a light emitting display panel or a flexible light emitting display panel, but is not limited thereto. The display panel 110 may include a pixel array substrate including a pixel array layer including a plurality of pixels and a package layer encapsulating the pixel array layer.

[0154] For example, the display panel 110 may display an image in a type such as a top emission type, a bottom emission type, or a dual emission type based on the structure of the pixel array layer including an anode, a cathode, and an organic compound layer. In the top emission type, visible light emitted from the pixel array layer may be irradiated onto an area in front of the substrate to allow the image to be displayed. In the bottom emission type, visible light emitted from the pixel array layer may be irradiated onto a rear area behind the substrate to allow the image to be displayed. In the dual emission type, visible light emitted from the pixel array layer may be emitted to a front area and a rear area with respect to the substrate.

[0155] The plurality of pixels may be respectively located in a plurality of pixel regions defined by a plurality of pixel driving lines. In addition, each of the plurality of pixels may include: a pixel circuit including at least two thin film transistors (TFTs) and at least one capacitor; and a light emitting device that emits light using current supplied from the pixel circuit, but is not limited thereto. For example, the light emitting device may include an organic light emitting layer or a quantum dot light emitting layer, but is not limited thereto. As another example, the light emitting device may include a micro light emitting diode (LED), but is not limited thereto.

[0156] The encapsulation layer can protect the TFT and the light-emitting device from external impacts and can prevent water or moisture from penetrating into the light-emitting device. The encapsulation layer can be replaced with an encapsulation substrate, which is attached to the pixel array substrate by a filler surrounding the pixel array. If the filler is a transparent filler, the encapsulation substrate can be a transparent encapsulation substrate.

[0157] The display module 100 according to an embodiment of the present disclosure may further include a touch panel 130. The touch panel 130 may include a touch electrode layer disposed on the display panel 110 and including touch electrodes for sensing a user touch applied to the display module 100. The touch electrode layer can sense a capacitance change of the touch electrodes caused by a user touch. For example, a mutual capacitance type in which a plurality of touch driving electrodes and a plurality of touch sensing electrodes are arranged to intersect each other or a self-capacitance type having only a plurality of touch sensing electrodes can be applied, and an adhesive layer can be disposed on the upper surface or the lower surface and can be attached to and fixed to an upper element or a lower element.

[0158] The display module 100 may further include a polarizing film 150 disposed on the touch panel 130. The polarizing film 150 may be attached to the upper surface of the touch panel 130 through a film attachment member. The polarizing film 150 can circularly polarize external light reflected by the TFT and / or the pixel driving lines disposed on the pixel array substrate, thereby improving the visibility and contrast of the display panel 110. The polarizing film 150 may be located between the touch panel 130 and the encapsulation layer of the display panel 110.

[0159] The display module 100 may further include a barrier layer located between the touch panel 130 and the encapsulation layer of the display panel 110. The barrier layer can prevent water or moisture, etc. from penetrating into the pixel array.

[0160] The display module 100 may further include a color filter layer disposed on the upper surface of the encapsulation layer of the display panel 110. The color filter layer may include color filters that are disposed to overlap each of the plurality of pixels and transmit only wavelengths of the colors set in each of the plurality of pixels.

[0161] The support member 300 can accommodate the display module 100. In the present disclosure, the support member 300 may be referred to as a "cover bottom", "plate bottom", "back cover", "base frame", "metal bottom plate", "bottom plate base", or "m bottom plate". Therefore, the support member 300 can be a support for supporting the display panel 110 and can be implemented as any type of frame or plate structure located on the rear surface of the display device, respectively.

[0162] For example, the support member 300 may support the rear surface and the side surfaces of the display panel. For example, the support member 300 may include a rear support member portion 310 and side support member portions 330. The rear support member portion 310 may be located on the rear surface of the display module 100 and may cover the rear surface of the display module 100. For example, the rear support member portion 310 may cover the circuit accommodation space in the rear surface of the display module 100. For example, the rear support member portion 310 may be formed of the same material as the cover window 700 or may be formed of a glass material different from the material of the cover window 700. For example, the rear support member portion 310 may be a rear cover, but the term is not limited thereto. For example, the rear support member portion 310 may be provided independently of the side support member portions 330.

[0163] The side support member portions 330 may surround each of the side surfaces of the display module 100 to have a display accommodation space in which the display module 100 is accommodated. The side support member portions 330 may have a frame shape or a rounded corner shape, but are not limited thereto. For example, each of the side surfaces of the support member 300 may be circular to have a radius of curvature in order to improve the design aesthetic of the display device.

[0164] The side support member portions 330 may include first to fourth side surfaces 331 to 334 of the support member 300. The first to fourth side surfaces 331 to 334 of the support member 300 may provide an accommodation space for accommodating the display module 100. For example, the first to fourth side surfaces 331 to 334 of the support member 300 may provide a circuit accommodation space for accommodating circuit configurations such as peripheral circuits and driving circuits of an electronic device including a battery.

[0165] The first side surface 331 of the support member 300 may be disposed parallel to the first longitudinal direction X of the display device. For example, the first side surface 331 of the support member 300 may be disposed perpendicular to the first side surface or the first long side of the rear support member portion 310. The first side surface 331 of the support member 300 may surround the first side surface or a short side of the display module 100.

[0166] The second side surface 332 of the support member 300 may be disposed parallel to the first side surface 331 of the support member 300. For example, the second side surface 332 of the support member 300 may be perpendicular to the second side surface or the second long side of the rear support member portion 310. The second side surface 332 of the support member 300 may surround the second side surface or the other short side of the display module 100.

[0167] The third side surface 333 of the support member 300 may be disposed parallel to the second longitudinal direction Y of the display device, and the second longitudinal direction Y of the display device intersects or is perpendicular to the first longitudinal direction X of the display device. For example, the third side surface 333 of the support member 300 may be perpendicular to the third side surface or the first short side of the rear portion 310 of the support member. The third side surface 333 of the support member 300 may surround the third side surface or one long side of the display module 100.

[0168] The fourth side surface 334 of the support member 300 may be disposed parallel to the third side surface 333 of the support member 300. For example, the fourth side surface 334 of the support member 300 may be perpendicular to the fourth side surface or the second short side of the rear portion 310 of the support member. The fourth side surface 334 of the support member 300 may surround the fourth side surface or the other long side of the display module 100.

[0169] The support member 300 according to an embodiment of the present disclosure may further include a vibration device exposure portion located in the third side surface 333 of the support member 300. For example, the vibration device exposure portion may protrude from the third side surface 333 of the support member 300 and may be located near the sound generation module 400. Accordingly, the sound generation module 400 attached to the rear surface of the display module 100 may be externally exposed through the vibration device exposure portion. In addition, a part of the lower portion of the sound generation module 400 may be inserted into the vibration device exposure portion. The vibration device exposure portion may ensure a vibration space for the vibration of the sound generation module 400 provided in the display module 100. Accordingly, the display device may be thinned and the sound generation module 400 may be easily placed. When the distance between the rear portion 310 of the support member and the rear surface of the display module 100 is greater than the vibration space, the vibration device exposure portion may be omitted.

[0170] The display device 10 according to an embodiment of the present disclosure may further include a driving circuit 600 and a cover window 700.

[0171] The driving circuit 600 may be located in a circuit accommodation space in the support member 300 and may be connected to the display panel 110 and the sound generation module 400. The driving circuit 600 may include a panel driving circuit and a sound processing circuit.

[0172] The panel driving circuit may be mounted on the display panel 110 or a circuit board to display an image on the display panel 110. The panel driving circuit may be connected to a pad portion on the pixel array substrate of the display panel 110 and provide a driving signal and a data signal to the pixel driving lines, thereby displaying an image on each pixel.

[0173] The sound processing circuit can generate an audio signal based on an audio source and amplify the audio signal to generate a vibration driving signal. The vibration generating device 401 of the sound generating module 400 can vibrate based on the generated vibration driving signal.

[0174] The cover window 700 can be coupled or connected to the support member 300 to support the display module 100. The cover window 700 can be formed of glass or strengthened glass material. For example, the cover window 700 can have sapphire glass, Gorilla glass, or a stacked structure thereof. The cover window 700 can be attached to the front surface of the display module 100 via an adhesive member. The adhesive member can be, but is not limited to, an optically clear adhesive (OCA), an optically clear resin (OCR), or a pressure sensitive adhesive (PSA).

[0175] In one embodiment, the cover window 700 can cover the non-display area of the display module 100 except for the display area. In another embodiment, the cover window 700 can include a transparent area overlapping with the display area of the display module 100, a light-shielding area overlapping with the non-display area of the display module 100, and a design layer provided in the light-shielding area to cover the non-display area of the display module 100. The cover window 700 can be a support member, a window cover, etc., and is not limited thereto.

[0176] The sound generating module 400 can be located on the rear surface of the display module 100 (e.g., the rear surface of the display panel 110). The sound generating module 400 can include a vibration generating device 401. For example, the vibration generating device 401 can be located on the rear surface of the display panel 110. The sound generating module 400 can vibrate the display module 100 based on the vibration driving signal applied to the vibration generating device 401. Therefore, the sound generating module 400 can output sound in the forward direction Z with respect to the display panel 110 based on the vibration of the display panel 110. The vibration generating device 401 can use the display panel 110 as a vibrating plate to generate sound. For example, the vibration generating device 401 can directly vibrate the display panel 110 to generate sound. The vibration generating device 401 can be referred to as an "actuator", "exciter", or "transducer", but is not limited thereto. For example, the sound generating device 401 can be a sound device for outputting sound according to an electrical signal.

[0177] The vibration generating device 401 can include a piezoelectric material layer having a piezoelectric effect and an electrode located at the piezoelectric material layer. The vibration generating device 401 can include a piezoelectric material layer, and thus, can be referred to as a "piezoelectric device".

[0178] The piezoelectric material layer may include a piezoelectric material that vibrates with an electric field. Here, the piezoelectric material may have the property that when pressure is applied to the crystal structure due to an external force or distortion occurs in the crystal structure, a potential difference is caused by medium polarization based on the relative position change of positive (+) ions and negative (-) ions, and vibration occurs due to the electric field based on the applied voltage.

[0179] The vibration generating device 401 may include a polymer material containing a piezoelectric material, a thin film material having a piezoelectric material, a composite material having a piezoelectric material, or a single crystal ceramic or polycrystalline ceramic having a piezoelectric material. Examples of the polymer material having a piezoelectric material may include polyvinylidene fluoride (PVDF), polyvinylidene fluoride trifluoroethylene P(VDF-TrFe), and P(VDFTeFE). Examples of the thin film material containing a piezoelectric material may include ZnO, CdS, and AlN. Examples of the composite material having a piezoelectric material may include PZT-PVDF, PZT-silicone rubber, PZT-epoxy resin, PZT-foam polymer, and PZT-foam polyurethane. Examples of the single crystal ceramic having a piezoelectric material may include α-AlPO 4 、α-SiO 2 、LiNbO 3 、Tb 2 (MoO 4 ) 3 、Li 2 B 4 O 7 and ZnO. Examples of the polycrystalline ceramic having a piezoelectric material may include PZT-based materials, PT-based materials, PZT composite perovskite-based materials, and BaTiO 3 .

[0180] The vibration generating device 401 may have a shape such as a rectangular (e.g., quadrilateral) shape, a square shape, a rhombus shape, or a parallelogram shape, but the shape is not limited thereto.

[0181] The sound generating module 400 may further include a reinforcing member. The reinforcing member may be further located on the upper surface and / or the lower surface of the vibration generating device 401, and thus, separation or breakage of the vibration generating device 401 due to an external impact may be reduced or prevented. The reinforcing member may include a first reinforcing member 802 and a second reinforcing member 804. The first reinforcing member 802 and the second reinforcing member 804 may be respectively located on the upper surface and the lower surface of the vibration generating device 401. Thus, separation or breakage of the vibration generating device 401 due to an external impact may be reduced or prevented. For example, the first reinforcing member 802 may be located on the lower surface of the vibration generating device 401, and the second reinforcing member 804 may be located on the upper surface of the vibration generating device 401.

[0182] The vibration generating device 401 may be coupled or connected to the reinforcing member by an adhesive member. For example, the vibration generating device 401 may be coupled or connected to the first reinforcing member 802 by the first adhesive member 403. For example, the vibration generating device 401 may be coupled or connected to the second reinforcing member 804 by the second adhesive member 405. The second reinforcing member 804 may be disposed on the rear surface of the display panel 110 or coupled or connected to the rear surface of the display panel 110 by the third adhesive member 407.

[0183] The circuit board 620 connected to the driving circuit 600 may be located on the lower surface of the vibration generating device 401. The driving circuit 600 may apply a vibration driving signal to the circuit board 620, and thus, a signal may be applied to the vibration generating device 401. The fourth adhesive member 404 may be disposed on the lower surface of the circuit board 620.

[0184] When the reinforcing member is located at the vibration generating device 401, the durability against external shock may be improved, but the strain energy density based on the thickness or height of the sound generating module 400 may change. This will be described below with reference to Figure 3 this.

[0185] Figure 3 Illustrated are simulation results of the strain energy density in the sound generating module according to an embodiment of the present disclosure.

[0186] In Figure 3 , the strain energy density (SED) (mJ / mm 3 ) represents the relationship between stress and strain rate. The results show that as the strain energy density becomes lower, the impact resistance against external shock becomes stronger. Here, "a" represents only the vibration generating device being provided, "b" represents the display device in which Figure 2 is implemented, and "c" represents the reinforcing member being disposed on the upper surface or the lower surface of the vibration generating device without the adhesive member in Figure 2 . Referring to Figure 3 , it can be seen that the strain energy density of a in the case where only the vibration generating device is provided is 0.667 mJ / mm 3 , the strain energy density of b in the case where the adhesive member and the reinforcing member are provided is 0.087 mJ / mm 3 , and the strain energy density of c in the case where the reinforcing member is provided without the adhesive member is 0.037 mJ / mm 3It can be seen that the strain energy density is lower in the case where the bonding member and the reinforcing member are provided than in the case where only the vibration generating device is provided. It can be seen that the strain energy density when the reinforcing member is provided without the bonding member is almost similar to the strain energy density when the bonding member and the reinforcing member are provided. Therefore, it can be seen that the impact resistance against external shocks is improved when the bonding member and the reinforcing member are provided.

[0187] Figure 4A and Figure 4B illustrates a sound generating module according to an embodiment of the present disclosure.

[0188] Figure 4A and Figure 4B illustrates another embodiment of a sound generating module for reducing the height of the sound generating module to increase the sound pressure level of the sound generating module. Refer to Figure 4A , a sound generating module 410 according to an embodiment of the present disclosure may include a vibration generating device 401, a first reinforcing member 802 located on the lower surface of the vibration generating device 401, and a circuit board 620. The bonding member may be located on each of the upper surface and the lower surface of the vibration generating device 401. For example, the sound generating module 410 may include a first bonding member 403 located on the lower surface of the vibration generating device 401 and a second bonding member 405 located on the upper surface of the vibration generating device 401. A fourth bonding member 404 may be located on the lower surface of the circuit board 620.

[0189] Refer to Figure 4B , a sound generating module 420 according to an embodiment of the present disclosure may include a vibration generating device 401, a second bonding member 405 located on the upper surface of the vibration generating device 401, and a circuit board 620 located on the lower surface of the vibration generating device 401.

[0190] Figure 5 illustrates the height and sound pressure level of an impact test process performed on a sound generating module according to an embodiment of the present disclosure.

[0191] In Figure 5 , the horizontal axis (x-axis) represents the impact test height (mm), and the vertical axis (y-axis) represents the sound pressure level (SPL) in decibels (dB).

[0192] An external impact test performed on a display device can use, for example, a ball drop test. The ball drop test can be a test in which a sound generation module to be impacted and a display panel including the sound generation module are fixed to a dropping position, and by increasing the distance by 1 cm each time in the vertical direction to allow an iron ball with a weight of 100 g or 1000 g to freely fall, the display performance of the impacted display panel is compared with the performance of the sound generation module after a drive test. In a case where it is desired to check quantitative control problems and secondary collision problems associated with free fall with respect to a completed (or final product) display device applying a display panel and a sound generation module, a free fall impact test with added reliability can be used. The free fall impact test can be a test in which, in a state where a completed display device is applied, a falling target is transported to a certain height (e.g., 1 m or more) and freely falls on a landing floor surface, and by using various sensors, the degree of damage to the falling target is determined. However, the implementation is not limited thereto, and another method can be used as an impact test performed on a display panel and a sound generation module.

[0193] Reference Figure 5 , PS represents Figure 2 the sound generation module, and each of SL, IL, CL, SH, CH, and IH represents Figure 4A the sound generation module, and each of P1 and P2 represents Figure 4B the sound generation module. PS and P2 represent examples in which the lateral length of the vibration generation device is set to be longer than its longitudinal length. P1, SH, CL, SL, IH, and CH represent examples in which the lateral length of the vibration generation device is set to be equal to its longitudinal length. Each of PS, SH, CL, SL, IH, and CH represents a result obtained by measuring an external impact and a sound pressure level based on the materials of the reinforcing member and the adhesive member. In IH and CH, each representing a result obtained by testing two sound generation modules, the test results are illustrated as two, and each of the two test results is shown as a dotted circle. PS represents an example in which the reinforcing member is formed of stainless steel and an adhesive member with a low elastic modulus is provided. SL represents an example in which the reinforcing member is formed of stainless steel and an adhesive member with a low elastic modulus is provided. IL represents an example in which the reinforcing member is formed of polyimide and an adhesive member with a low elastic modulus is provided. CL represents an example in which the reinforcing member is formed of polycarbonate and an adhesive member with a low elastic modulus is provided. SH represents an example in which the reinforcing member is formed of stainless steel and an adhesive member with a high elastic modulus is provided. CH represents an example in which the reinforcing member is formed of polycarbonate and an adhesive member with a high elastic modulus is provided. IH represents an example in which the reinforcing member is formed of polyimide and an adhesive member with a high elastic modulus is provided.

[0194] ReferenceFigure 5 It can be seen that the sound pressure level varies with the size of the vibration generating device. For example, it can be seen that the sound pressure level in P1 is higher than that in P2. Therefore, it can be seen that the sound pressure level of a vibration generating device with the same transverse length and longitudinal length is higher than that of a vibration generating device with a transverse length longer than the longitudinal length.

[0195] In Figure 5 it, the results show that as the impact test height increases, the impact resistance against external impacts increases. The impact resistance can vary based on whether a reinforcing member is provided. For example, it can be seen that the impact resistance is increased by two to five times in PS, SL, IL, CL, SH, IH, and CH where a reinforcing member is provided compared to P1 and P2 where no reinforcing member is provided.

[0196] For example, when an adhesive member with a lower elastic modulus is applied, the sound pressure level can vary based on the number of reinforcing members and the material of the reinforcing members. For example, it can be seen that the sound pressure level in PS with two reinforcing members is lower than that in SL, IL, and CL with one reinforcing member. It can be seen that the sound pressure level of IL with a reinforcing member formed of polyimide and the sound pressure level of CL with a reinforcing member formed of polycarbonate are higher than the sound pressure level of SL with a reinforcing member formed of stainless steel. It can be seen that the sound pressure level of CL with a reinforcing member formed of polycarbonate is higher than the sound pressure level of IL with a reinforcing member formed of polyimide.

[0197] For example, when an adhesive member with a high elastic modulus is applied, the sound pressure level can vary based on the material of the reinforcing members. For example, it can be seen that the sound pressure level of IH with a reinforcing member formed of polyimide and the sound pressure level of CH with a reinforcing member formed of polycarbonate are higher than the sound pressure level of SH with a reinforcing member formed of stainless steel. It can be seen that the sound pressure level of IH with a reinforcing member formed of polyimide is higher than the sound pressure level of CH with a reinforcing member formed of polycarbonate.

[0198] For example, the results show that the impact resistance varies based on the material of the adhesive member. For example, it can be seen that the impact resistance of each of SH, CH, and IH with an adhesive member having a high elastic modulus is 2 to 2.5 times that of each of PS, IL, SL, and CL with an adhesive member having a low elastic modulus.

[0199] Therefore, when a reinforcing member is provided and an adhesive member with a high elastic modulus is provided, it can be seen that the sound pressure level and the impact resistance are increased. For example, in the case where the reinforcing member is formed of polyimide and an adhesive member with a high elastic modulus is provided, it can be seen that the impact resistance against external impacts is increased and the sound pressure level is increased.

[0200] Figure 6 is a cross-sectional view taken along the line I-I’ illustrated in Figure 1 according to another embodiment of the present disclosure.

[0201] Referring to Figure 6 , a display device 20 according to an embodiment of the present disclosure may include a display module 100, a support member 300, and a sound generation module 430. The display module 100 may include a display panel 110. The display module 100, the display panel 110, and the support member 300 are as described above with reference to Figure 1 and Figure 2 and, thus, their descriptions will be omitted or briefly given below.

[0202] As described above with reference to Figure 4A , Figure 4B and Figure 5 , when a reinforcing member is provided, impact resistance can be improved, but the height of the sound generation module may increase, thereby causing a problem of a decrease in sound pressure level and a thickening of the thickness of the sound generation module. In addition, since the adhesive for attaching the circuit board penetrates into the bonding member, the present inventors have recognized that the bonding surface between the reinforcing member and the bonding member is uneven, and thus, the reinforcing member located on the lower surface of the vibration generating device may be partially separated. Therefore, the inventors have performed various experiments to implement a sound generation module in which its thickness does not increase, impact resistance is improved, and problems caused by the reinforcing member do not occur. Through various experiments, the present inventors have invented a sound generation module having a new structure in which the thickness of the sound generation module does not increase, impact resistance is improved, and defects caused by partial separation of the reinforcing member do not occur.

[0203] As described above with reference to Figure 4A , Figure 4B and Figure 5 , when the reinforcing member is formed of polyimide, it can be seen that the impact resistance against external shocks is improved. Therefore, the inventors have performed various experiments for applying polyimide to the reinforcing member. This will be described below.

[0204] Referring to Figure 6, the sound generating module 430 according to an embodiment of the present disclosure may include a vibration generating device 431 and a circuit board 625 located on the lower surface of the vibration generating device 431. Through various experiments, the present inventors have recognized that the circuit board is formed of polyimide and the polyimide can be used to form a reinforcing member without increasing the thickness of the sound generating module. For example, the circuit board 625 may be a flexible printed circuit board (FPCB), but is not limited thereto. For example, the circuit board 625 may be formed of polyimide. The circuit board 625 may have the same size as the vibration generating device 401 and may be implemented as a reinforcing member. When the circuit board 625 may have the same size as the vibration generating device 401, the circuit board 625 can be easily set in the process as compared with Figure 2 . Therefore, since the circuit board constructs the reinforcing member, the thickness of the sound generating module may not be increased, and the impact resistance against external shocks can be improved.

[0205] The vibration generating device 431 can be disposed on the circuit board 625 and the display panel 110 by an adhesive member or coupled or connected to the circuit board 625 and the display panel 110. For example, the vibration generating device 431 can be disposed on the circuit board 625 by a first adhesive member 433 or coupled or connected to the circuit board 625. For example, the vibration generating device 431 can be disposed on the display panel 110 by a second adhesive member 435 or coupled or connected to the display panel 110. The elastic modulus (or Young's modulus) of the first adhesive member 433 can be different from that of the second adhesive member 435. For example, the elastic modulus of the first adhesive member 433 can be higher than that of the second adhesive member 435. For example, the elastic modulus of the first adhesive member 433 can be 1 GPa to 200 GPa. For example, the elastic modulus of the second adhesive member 435 can be 0.1 MPa to 30 MPa. For example, the second adhesive member 435 adjacent to the display panel 110 can be formed of a material having an elastic modulus lower than that of the first adhesive member 433 so as not to affect the sound pressure level corresponding to the low frequency when the sound generating module 430 vibrates. For example, the first adhesive member 433 can be formed of an adhesive resin, but is not limited thereto. For example, the first adhesive member 433 can be configured as an adhesive member having conductivity. For example, the first adhesive member 433 can include a thermosetting material containing a conductive filler, but is not limited thereto. For example, the first adhesive member 433 can include a thermosettable acrylic material containing a conductive filler, but is not limited thereto. The circuit board 625 can be disposed on the vibration generating device 431 by the first adhesive member 433 or coupled or connected to the vibration generating device 431. Accordingly, the adhesive member located on at least one electrode and the adhesive member for coupling or connecting the circuit board to the vibration generating device can be provided as one adhesive member, and thus, the manufacturing process can be simplified. For example, the second adhesive member 435 can include an adhesive or an adhesive each including at least one of the following: a double-sided tape, an acrylic resin, an epoxy-based resin, a silicone-based resin, a polyurethane-based resin, and a polyvinyl alcohol-based resin, but is not limited thereto. The vibration generating device 431 can be disposed on the display panel 110 by the second adhesive member 435 or coupled or connected to the display panel 110. The first adhesive member 433 and the second adhesive member 435 can each be an adhesive member or an adhesive, but the term is not limited thereto. Accordingly, since the reinforcing member is provided and the adhesive member having a high elastic modulus is provided, the impact resistance against external impact can be improved, and the sound pressure level can be improved.

[0206] The circuit board 625 may be located on the lower surface of the vibration generating device 431. The circuit board 625 may include a substrate film 610, a first electrode 612, a second electrode 613, and a passivation layer 611. The substrate film 610 may be located on the lower surface of the vibration generating device 431. The substrate film 610 may be formed of a polyimide-based material. The first electrode 612 and the second electrode 613 may be located on the lower surface of the vibration generating device 431. For example, the first electrode 612 and the second electrode 613 may be located on the upper and lower surfaces of the substrate film 610. The first electrode 612 may be an electrode for applying a signal to the vibration generating device 431, and may be a VDD electrode or a common electrode. The second electrode 613 may be a ground electrode. The first electrode 612 and the second electrode 613 may be formed of an opaque metal material having a relatively low resistance and good heat dissipation characteristics. However, the embodiments are not limited thereto. For example, the first electrode 612 and the second electrode 613 may be formed of a transparent conductive material or a conductive polymer material. The passivation layer 611 may be provided to protect the line between the first electrode 612 and the second electrode 613. For example, the passivation layer 611 may be located in an area other than the first electrode 612 and the second electrode 613, but is not limited thereto. For example, the passivation layer 611 may be located on each of the upper and lower surfaces of the substrate film 610. For example, the first electrode 612 and the second electrode 613 may be spaced apart from each other on the lower surface of the vibration generating device 431, and the substrate film 610 and the passivation layer 611 may be located between the first electrode 612 and the second electrode 613. The passivation layer 611 may be configured to be of a type that coats or forms an adhesive or binder on a polyimide-based film, but is not limited thereto. For example, the adhesive or binder may include at least one of a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto.

[0207] Figure 7 is a cross-sectional view taken along the line I-I' according to another embodiment of the present disclosure. Figure 1 illustrated in

[0208] Referring to Figure 7 , a display device 30 according to an embodiment of the present disclosure may include a display module 100, a support member 300, and a sound generating module 450. The display module 100 may include a display panel 110. The display module 100, the display panel 110, and the support member 300 are as described above with reference to Figure 1 and Figure 2 and thus, their descriptions will be omitted or briefly given below.

[0209] According to an embodiment of the present disclosure, the sound generating module 450 may include a vibration generating device 451 and a circuit board 630 located on the lower surface of the vibration generating device 451. The vibration generating device 451 may be disposed on the circuit board 630 and the display panel 110 through an adhesive member or coupled or connected to the circuit board 630 and the display panel 110. For example, the vibration generating device 451 may be disposed on the circuit board 630 or coupled or connected to the circuit board 630 through a first adhesive member 453. For example, the vibration generating device 451 may be disposed on the display panel 110 or coupled or connected to the display panel 110 through a second adhesive member 455. The elastic modulus (or Young's modulus) of the first adhesive member 453 may be different from the elastic modulus (or Young's modulus) of the second adhesive member 455. For example, the elastic modulus of the first adhesive member 453 may be higher than the elastic modulus of the second adhesive member 455. For example, the elastic modulus of the first adhesive member 453 may be from 1 GPa to 200 GPa. For example, the elastic modulus of the second adhesive member 455 may be from 0.1 MPa to 30 MPa. For example, the second adhesive member 455 adjacent to the display panel 110 may be formed of a material having an elastic modulus lower than that of the first adhesive member 453 so as not to affect the sound pressure level corresponding to the low frequency when the sound generating module 450 vibrates. For example, the first adhesive member 453 may include an adhesive or binder each including at least one of the following: a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto. For example, the second adhesive member 455 may include an adhesive or binder each including at least one of the following: a double-sided tape, an acrylic resin, an epoxy-based resin, a silicone-based resin, a polyurethane-based resin, and a polyvinyl alcohol-based resin, but is not limited thereto. The first adhesive member 453 and the second adhesive member 455 may each be an adhesive member or an adhesive, but the term is not limited thereto. Therefore, since the reinforcing member is provided and the adhesive member having a high elastic modulus is provided, the impact resistance against external shocks can be improved, and the sound pressure level can be improved.

[0210] The circuit board 630 may be located on the lower surface of the vibration generating device 451. The circuit board 630 may include a substrate film 610, a first electrode 612, a second electrode 613, and a passivation layer 611. The substrate film 610 may be located on the lower surface of the vibration generating device 451. The substrate film 610 may be formed of a polyimide-based material. The first electrode 612 and the second electrode 613 may be located on the lower surface of the vibration generating device 451. For example, the first electrode 612 and the second electrode 613 may be located on the upper and lower surfaces of the substrate film 610. The first electrode 612 may be an electrode for applying a signal to the vibration generating device 451, and may be a VDD electrode or a common electrode. The second electrode 613 may be a ground electrode. The first electrode 612 and the second electrode 613 may be formed of an opaque metal material having a relatively low resistance and good heat dissipation characteristics. However, the embodiments are not limited thereto. For example, the first electrode 612 and the second electrode 613 may be formed of a transparent conductive material or a conductive polymer material. A passivation layer 611 may be provided to protect the line between the first electrode 612 and the second electrode 613. For example, the passivation layer 611 may be located in a region other than the first electrode 612 and the second electrode 613, but is not limited thereto. For example, the passivation layer 611 may be located on each of the upper and lower surfaces of the substrate film 610. For example, the first electrode 612 and the second electrode 613 may be spaced apart from each other on the lower surface of the vibration generating device 431, and the substrate film 610 and the passivation layer 611 may be located between the first electrode 612 and the second electrode 613. The passivation layer 611 may be configured to be of a type that coats or forms an adhesive or binder on the polyimide-based film, but is not limited thereto. For example, the adhesive or binder may include at least one of a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto.

[0211] The fifth adhesive member 609 may be located on the first electrode 612 and the second electrode 613. For example, the first electrode 612 and the second electrode 613 may be attached to the lower surface of the vibration generating device 451 by the fifth adhesive member 609. The passivation layer 611 may be attached to the lower surface of the vibration generating device 451 by each of the first adhesive member 453 and the fifth adhesive member 609. For example, the fifth adhesive member 609 may be formed of a material different from that of the first adhesive member 453. For example, the fifth adhesive member 609 may be formed of a conductive adhesive. For example, the conductive adhesive may include a heat-curable (e.g., thermosetting) resin containing a conductive filler or a heat-curable polymer containing a conductive filler, but is not limited thereto. For example, the first adhesive member 453 may be formed of a material having a high elastic modulus. The adhesive may be attached to the circuit board 630. The circuit board 630 may be attached to the display panel by a compression process and a curing process in the case where the circuit board 630 is attached to the display panel, and in the compression process and the curing process, the adhesive of the circuit board 630 may flow out to the outside. A member 631 may be further provided between the first adhesive member 453 and the fifth adhesive member 609 to reduce or prevent defects such as partial separation of the circuit board 630 caused by the adhesive. Therefore, the member 631 may separate the first adhesive member 453 from the fifth adhesive member 609. For example, the member 631 may be formed of a polyimide-based material or a polycarbonate-based material, but is not limited thereto. Therefore, since the member 631 is provided between the first adhesive member 453 and the fifth adhesive member 609, the adhesive of the circuit board 630 may be reduced or prevented from flowing out to the outside during the compression process and the curing process. Therefore, the adhesive surface between the circuit board 630 and the first adhesive member 453 may be uniform, and therefore, defects such as partial separation of the circuit board 630 may be prevented.

[0212] The sixth adhesive member 608 may be located between the circuit board 630 and the member 631. For example, the sixth adhesive member 608 may be located between the base film 610 and the member 631. The member 631 may be disposed on the circuit board 630 or coupled or connected to the circuit board 630 by the sixth adhesive member 608. The sixth adhesive member 608 may be formed of an acrylic material or an epoxy-based material, but is not limited thereto.

[0213] Figure 8A , Figure 8B and Figure 8C According to another embodiment of the present disclosure Figure 7 Detailed view of the .

[0214] refer to Figure 8A , Figure 8B and Figure 8C, the sound generating module 450 may be located on the lower surface of the display module 100. The first electrode 612 and the second electrode 613 may be disposed at the vibration generating device 451. For example, the first electrode 612 and the second electrode 613 may be located on the lower surface of the vibration generating device 451. The first electrode 612 may be a VDD electrode or a common electrode, and the second electrode 613 may be a ground electrode. When the first electrode 612 is disconnected, the third electrode 614 may be an auxiliary electrode and may be a VDD electrode.

[0215] Reference Figure 8C , in the circuit board 630, the first adhesive member 453 and the fifth adhesive member 609 may be located on the base film 610. The member 631 may be located between the first adhesive member 453 and the fifth adhesive member 609. Figure 8C The right portion of Figure 8A illustrates the "C" portion of . For example, the first electrode 612, the second electrode 613, and the passivation layer 611 are illustrated. The passivation layer 611 may be provided to protect the line between the first electrode 612 and the second electrode 613. For example, the passivation layer 611 may be located in an area other than the first electrode 612 and the second electrode 613, but is not limited thereto. Figure 8A , Figure 8B and Figure 8C may be similarly applied to Figure 6 the sound generating module of . For example, elements other than the fifth adhesive member 609, the member 631, and the sixth adhesive member 608 may be similarly applied.

[0216] Figure 9 is a rear view of a display device according to another embodiment of the present disclosure.

[0217] Reference Figure 9 , each of the plurality of sound generating modules 430 and 450 may be located on the upper side of the rear surface of the display panel 110. The display panel 110 may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side. For example, the first short side and the second short side may be in the lateral direction of the display panel 110, and the long side may be in the longitudinal direction of the display panel 110. The lateral direction and the longitudinal direction may be interchangeable. For example, the distance d1 between the center of each of the plurality of vibration generating devices 431 and 451 and the first short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110. When the sound generating modules 430 and 450 are located on the upper portion of the rear surface of the display panel 110, the sound pressure level can be more improved compared to when the sound generating modules 430 and 450 are provided at the center of the display panel 110.

[0218] Figure 10Is a perspective view of a display device illustrating another embodiment according to the present disclosure. Figure 11 Is along Figure 10 The sectional view taken along the line II-II' illustrated in

[0219] Refer to Figure 10 And Figure 11 According to the present disclosure, the display device 40 according to an embodiment may include a display module 100, a support member 300, a first sound generating module 430, and a second sound generating module 530. The display module 100 may include a display panel 110. The display module 100, the display panel 110, and the support member 300 are as described above with reference to Figure 1 And Figure 2 Therefore, their descriptions will be omitted or briefly given below.

[0220] Refer to Figure 10 And Figure 11 According to the present disclosure, the display device 40 according to an embodiment may include a first sound generating module 430 and a second sound generating module 530. The sound generating module, the vibration generating device, and the circuit board described above with reference to Figure 6 May be the first sound generating module, the first vibration generating device, and the first circuit board illustrated in Figures 10 to 11 Respectively.

[0221] The first sound generating module 430 according to an embodiment of the present disclosure may include a first vibration generating device 431 and a first circuit board 625 located on the lower surface of the first vibration generating device 431.

[0222] The first vibration generating device 431 may be disposed on the first circuit board 625 and the display panel 110 by an adhesive member or coupled or connected to the first circuit board 625 and the display panel 110. For example, the first vibration generating device 431 may be disposed on the first circuit board 625 by a first adhesive member 433 or coupled or connected to the first circuit board 625. For example, the first vibration generating device 431 may be disposed on the display panel 110 by a second adhesive member 435 or coupled or connected to the display panel 110. The elastic modulus of the first adhesive member 433 may be different from the elastic modulus of the second adhesive member 435. For example, the second adhesive member 435 adjacent to the display panel 110 may be formed of a material having an elastic modulus lower than that of the first adhesive member 433 so as not to affect the sound pressure level corresponding to the low frequency when the first sound generating module 430 vibrates. For example, the first adhesive member 433 and the second adhesive member 435 may each include an adhesive member or an adhesive, but the term is not limited thereto. For example, the middle tone vocal band may be 200 Hz to 3 kHz, the high tone vocal band may be 3 kHz or higher, and the low tone vocal band may be 200 Hz or lower. However, this embodiment is not limited thereto.

[0223] The second sound generating module 530 according to an embodiment of the present disclosure may include a second vibration generating device 531 and a second circuit board 626 located on the lower surface of the second vibration generating device 531.

[0224] The second vibration generating device 531 may be disposed on the second circuit board 626 and the display panel 110, or coupled or connected to the second circuit board 626 and the display panel 110, by an adhesive member. For example, the second vibration generating device 531 may be disposed on the second circuit board 626, or coupled or connected to the second circuit board 626, by a third adhesive member 533. For example, the second vibration generating device 531 may be disposed on the display panel 110, or coupled or connected to the display panel 110, by a fourth adhesive member 535. The elastic modulus of the third adhesive member 533 may be different from the elastic modulus of the fourth adhesive member 535. For example, the elastic modulus of the third adhesive member 533 may be higher than the elastic modulus of the fourth adhesive member 535. For example, the elastic modulus of the third adhesive member 533 may be from 1 GPa to 200 GPa. For example, the elastic modulus of the fourth adhesive member 535 may be from 0.1 MPa to 30 MPa. For example, the fourth adhesive member 535 adjacent to the display panel 110 may be formed of a material having an elastic modulus lower than the elastic modulus of the third adhesive member 533 so as not to affect the sound pressure level corresponding to a low frequency when the second sound generating module 530 vibrates. For example, the third adhesive member 533 may be formed of an adhesive resin, but is not limited thereto. For example, the third adhesive member 533 may be configured as an adhesive member having conductivity. For example, the third adhesive member 533 may include a thermosetting material containing a conductive filler, but is not limited thereto. For example, the third adhesive member 533 may include a thermosetting acrylic material containing a conductive filler, but is not limited thereto. The second circuit board 626 may be disposed on the second vibration generating device 531, or coupled or connected to the second vibration generating device 531, by the third adhesive member 533. Accordingly, the adhesive member provided on at least one electrode and the adhesive member for coupling the circuit board to the vibration generating device may be provided as one adhesive member, and thus, the manufacturing process may be simplified.

[0225] For example, the fourth adhesive member 535 may include an adhesive or an adhesive agent each including at least one of the following: a double-sided tape, an acrylic resin, an epoxy-based resin, a silicone-based resin, a polyurethane-based resin, and a polyvinyl alcohol-based resin, but is not limited thereto. The third adhesive member 533 and the fourth adhesive member 535 may each be an adhesive member or an adhesive agent, but the term is not limited thereto. Accordingly, since the reinforcing member is provided and the adhesive member having a high elastic modulus is provided, the impact resistance against external impact may be improved, and the sound pressure level may be improved.

[0226] The first circuit board 625 may be located on the lower surface of the first vibration generating device 431. The first circuit board 625 may include a substrate film 610, a first electrode 612, a second electrode 613, and a passivation layer 611. It has been referred to above Figure 6The first circuit board 625 is described, and thus, its detailed description is omitted and the second circuit board will be described below. The second circuit board 626 may be located on the lower surface of the second vibration generating device 531. The second circuit board 626 may include a substrate film 610, a first electrode 612, a second electrode 613, and a passivation layer 611. The substrate film 610 may be located on the lower surface of the second vibration generating device 531. The substrate film 610 may be formed of a polyimide-based material. The first electrode 612 and the second electrode 613 may be located on the lower surface of the second vibration generating device 531. For example, the first electrode 612 and the second electrode 613 may be located on the upper and lower surfaces of the substrate film 610. The first electrode 612 may be an electrode for applying a signal to the second vibration generating device 531 and may be a VDD electrode or a common electrode. The second electrode 613 may be a ground electrode. The first electrode 612 and the second electrode 613 may be formed of an opaque metal material having a relatively low resistance and having good heat dissipation characteristics. However, the embodiments are not limited thereto. For example, the first electrode 612 and the second electrode 613 may be formed of a transparent conductive material or a conductive polymer material. A passivation layer 611 may be provided to protect the line between the first electrode 612 and the second electrode 613. For example, the passivation layer 611 may be located in a region other than the first electrode 612 and the second electrode 613, but is not limited thereto. For example, the passivation layer 611 may be located on each of the upper and lower surfaces of the substrate film 610. For example, the passivation layer 611 may be configured as a type of coating an adhesive or a binder on a polyimide-based film, but is not limited thereto. For example, the adhesive or the binder may include at least one of a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto.

[0227] Figure 12 is a cross-sectional view taken along the line II-II' illustrated in Figure 10 according to another embodiment of the present disclosure.

[0228] Referring to Figure 12 , a display device 50 according to an embodiment of the present disclosure may include a display module 100, a support member 300, a first sound generating module 450, and a second sound generating module 550. The display module 100 may include a display panel 110. The display module 100, the display panel 110, and the support member 300 are as described above with reference to Figure 1 and Figure 2 , and thus, their descriptions are omitted below or will be briefly given. The sound generating module, the vibration generating device, and the circuit board described above with reference to Figure 7 and Figure 8C may be the first sound generating module, the first vibration generating device, and the first circuit board respectively illustrated in Figure 12 respectively.

[0229] The first sound generating module 450 according to an embodiment of the present disclosure may include a first vibration generating device 451 and a circuit board 630 disposed on the lower surface of the first vibration generating device 451. The first vibration generating device 451 may be disposed on the circuit board 630 and the display panel 110 by an adhesive member or coupled or connected to the circuit board 630 and the display panel 110. For example, the first vibration generating device 451 may be disposed on the circuit board 630 or coupled or connected to the circuit board 630 by a first adhesive member 453. For example, the first vibration generating device 451 may be disposed on the display panel 110 or coupled or connected to the display panel 110 by a second adhesive member 455. The elastic modulus of the first adhesive member 453 may be different from the elastic modulus of the second adhesive member 455. For example, the elastic modulus of the first adhesive member 453 may be higher than the elastic modulus of the second adhesive member 455. For example, the elastic modulus of the first adhesive member 453 may be 1 GPa to 200 GPa. For example, the elastic modulus of the second adhesive member 455 may be 0.1 MPa to 30 MPa. For example, the second adhesive member 455 adjacent to the display panel 110 may be formed of a material having an elastic modulus lower than that of the first adhesive member 453 so as not to affect the sound pressure level corresponding to a low frequency when the first sound generating module 450 vibrates. For example, the first adhesive member 453 may include an adhesive or binder each including at least one of the following: a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto. For example, the second adhesive member 455 may include an adhesive or binder each including at least one of the following: a double-sided tape, an acrylic resin, an epoxy-based resin, a silicone-based resin, a polyurethane-based resin, and a polyvinyl alcohol-based resin, but is not limited thereto. The first adhesive member 453 and the second adhesive member 455 may each be an adhesive member or an adhesive, but the term is not limited thereto.

[0230] The second sound generating module 550 according to an embodiment of the present disclosure may include a second vibration generating device 551 and a second circuit board 632 disposed on the lower surface of the second vibration generating device 551.

[0231] The second vibration generating device 551 may be disposed on the second circuit board 632 and the display panel 110 by an adhesive member or coupled or connected to the second circuit board 632 and the display panel 110. For example, the second vibration generating device 551 may be disposed on the second circuit board 632 by a third adhesive member 553 or coupled or connected to the second circuit board 632. For example, the second vibration generating device 551 may be disposed on the display panel 110 by a fourth adhesive member 555 or coupled or connected to the display panel 110. The elastic modulus of the third adhesive member 553 may be different from the elastic modulus of the fourth adhesive member 555. For example, the elastic modulus of the third adhesive member 553 may be higher than the elastic modulus of the fourth adhesive member 555. For example, the elastic modulus of the third adhesive member 553 may be 1 GPa to 200 GPa. For example, the elastic modulus of the fourth adhesive member 555 may be 0.1 MPa to 30 MPa. For example, the fourth adhesive member 555 adjacent to the display panel 110 may be formed of a material having an elastic modulus lower than the elastic modulus of the third adhesive member 553 so as not to affect the sound pressure level corresponding to the low frequency when the second sound generating module 550 vibrates. For example, the third adhesive member 553 may include an adhesive or binder each including at least one of the following: a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto. For example, the fourth adhesive member 555 may include an adhesive or binder each including at least one of the following: a double-sided tape, an acrylic resin, an epoxy-based resin, a silicone-based resin, a polyurethane-based resin, and a polyvinyl alcohol-based resin, but is not limited thereto. The third adhesive member 553 and the fourth adhesive member 555 may each be an adhesive member or an adhesive, but the term is not limited thereto. Therefore, since the reinforcing member is provided and the adhesive member having a high elastic modulus is provided, the impact resistance against external shocks can be improved, and the sound pressure level can be improved.

[0232] The first circuit board 630 may be located on the lower surface of the first vibration generating device 451. The first circuit board 630 may include a base film 610, a first electrode 612, a second electrode 613, and a passivation layer 611. It has been referred to above with reference to Figure 7The first circuit board 630 is described, and thus, its detailed description is omitted and the second circuit board will be described below. The second circuit board 632 may be located on the lower surface of the second vibration generating device 531. The second circuit board 632 may include a substrate film 610, a first electrode 612, a second electrode 613, and a passivation layer 611. The substrate film 610 of each of the first circuit board 630 and the second circuit board 632 may be formed of a polyimide-based material. The first electrode 612 and the second electrode 613 may be located on the lower surface of the second vibration generating device 551. The first electrode 612 may be an electrode for applying a signal to the second vibration generating device 551 and may be a VDD electrode or a common electrode. The second electrode 613 may be a ground electrode. The first electrode 612 and the second electrode 613 may be formed of an opaque metal material having a relatively low resistance and good heat dissipation characteristics. However, the embodiments are not limited thereto. For example, the first electrode 612 and the second electrode 613 may be formed of a transparent conductive material or a conductive polymer material. The passivation layer 611 may be provided to protect the wire between the first electrode 612 and the second electrode 613. For example, the passivation layer 611 may be located in a region other than the first electrode 612 and the second electrode 613, but is not limited thereto. For example, the passivation layer 611 may be located on each of the upper surface and the lower surface of the substrate film 610. For example, the passivation layer 611 may be configured as a type of coating an adhesive or a binder on a polyimide-based film, but is not limited thereto. For example, the adhesive or the binder may include at least one of a cyanoacrylate adhesive, an epoxy-based adhesive, an acrylate adhesive, and an acrylic adhesive, but is not limited thereto.

[0233] The fifth bonding member 609 may be located on the first electrode 612 and the second electrode 613. For example, the fifth bonding member 609 may be formed of a material different from that of the third bonding member 553. For example, the fifth bonding member 609 may be formed of a conductive adhesive. For example, the conductive adhesive may include a thermosettable resin containing a conductive filler or a thermosettable polymer containing a conductive filler, but is not limited thereto. For example, the third bonding member 553 may be formed of a material having a high elastic modulus. The adhesive may be attached to the second circuit board 632. The second circuit board 632 may be attached to the display panel through a compression process and a curing process in a case where the second circuit board 632 is attached to the display panel, and in the compression process and the curing process, the adhesive of the second circuit board 632 may flow out to the outside. A member 631 may be further provided between the third bonding member 553 and the fifth bonding member 609 to reduce or prevent defects such as partial separation of the second circuit board 632 caused by the adhesive. Therefore, the member 631 may separate the third bonding member 553 from the fifth bonding member 609. For example, the member 631 may be formed of a polyimide-based material or a polycarbonate-based material, but is not limited thereto. Therefore, since the member 631 is provided between the third bonding member 553 and the fifth bonding member 609, the adhesive of the second circuit board 632 may be reduced or prevented from flowing out to the outside in the compression process and the curing process. Therefore, the bonding surface between the second circuit board 632 and the third bonding member 553 may be uniform, and thus, defects such as partial separation of the second circuit board 632 may be prevented.

[0234] The sixth bonding member 608 may be located between the second circuit board 632 and the member 631. For example, the sixth bonding member 608 may be located between the substrate film 610 and the member 631. The member 631 may be disposed on the second circuit board 632 or coupled or connected to the second circuit board 632 through the sixth bonding member 608. The sixth bonding member 608 may be formed of an acrylic material or an epoxy-based material, but is not limited thereto.

[0235] Figure 13 is a rear view of a display panel according to another embodiment of the present disclosure.

[0236] Reference Figure 9, each of the plurality of first sound generation modules 430 and 450 may be located on the upper portion of the rear surface of the display panel 110. The display panel 110 may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side. For example, the first short side and the second short side may be in the lateral direction of the display panel 110, and the long side may be in the longitudinal direction of the display panel 110. The lateral direction and the longitudinal direction may be interchangeable. For example, the distance d1 between the center of each of the plurality of first vibration generating devices 431 and 451 and the first short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110. When the first sound generation modules 430 and 450 are located on the upper portion of the rear surface of the display panel 110, the sound pressure level may be more improved compared to when the sound generation modules 430 and 450 are disposed at the center of the display panel 110. Each of the plurality of second sound generation modules 530 and 550 may be disposed on the lower portion of the rear surface of the display panel 110. For example, the distance d2 between the center of each of the plurality of second sound generation modules 530 and 550 and the second short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110. The second short side of the display panel 110 may be the side facing the first short side. The second sound generation modules 530 and 550 may be disposed symmetrically with respect to the center of the display module 100 with the first sound generation modules 430 and 450.

[0237] Figure 14 is a rear view of a display panel according to another embodiment of the present disclosure.

[0238] Reference Figure 14 , a display device 60 according to an embodiment of the present disclosure may include a plurality of first sound generation modules 430 and 450 and a plurality of second sound generation modules 530 and 550. The first sound generation modules 430 and 450 may vibrate a first rear area A1 of the display module 100 based on vibration drive signals provided from the circuit boards 625 and 630 of the drive circuit 600. The first rear area A1 may be a right rear area with respect to the longitudinal direction or the long side direction X of the display module 100 or an area located between the rear center portion or the center portion CL1 of the display module 100 and one end of the display module 100. For example, the first rear area A1 may be an upper right peripheral area or an upper left peripheral area or another peripheral area of the display module 100 with respect to the longitudinal direction or the long side direction X of the display module 100.

[0239] The second sound generating modules 530 and 550 may vibrate the second rear area A2 of the display module 100 based on vibration driving signals from the circuit boards 626 and 632 of the driving circuit 600. The second rear area A2 may be a right rear area with respect to the longitudinal direction or the long side direction X of the display module 100 or an area between the central portion CL1 of the display module 100 and the other end of the display module 100. For example, the second rear area A2 may be a left peripheral area, a right peripheral area, or another peripheral area of the display module 100 with respect to the longitudinal direction or the long side direction X of the display module 100. The second sound generating modules 530 and 550 may be arranged symmetrically with the first sound generating modules 430 and 450. For example, the second sound generating modules 530 and 550 may be arranged symmetrically with respect to the central portion CL1 of the display module 100 and the first sound generating modules 430 and 450.

[0240] The display device 60 according to an embodiment of the present disclosure may further include a spacer 900. The spacer 900 may be disposed at the rear central portion CL1 of the display module 100. For example, the spacer 900 may be located between the first sound generating modules 430 and 450 and the second sound generating modules 530 and 550. For example, the spacer 900 may spatially separate or divide the first rear area A1 overlapping with the first sound generating modules 430 and 450 and the second rear area A2 overlapping with the second sound generating modules 530 and 550 on the rear surface of the display panel 110, thereby reducing or preventing interference between the sounds generated by the first rear area A1 and the second rear area A2. The spacer 900 may spatially separate or divide the first rear area A1 and the second rear area A2 respectively provided on the rear surface of the display module 100 (or the display panel 110) to prevent interference between the sounds generated by the first rear area A1 and the second rear area A2. Therefore, the spacer 900 may separate the sounds generated by the first vibration generating devices 431 and 451 and the second vibration generating devices 531 and 551 to reduce or prevent interference between the generated sounds, thereby allowing 2.0 channel sound to be output to the front area with respect to the display module 100 based on the vibration of the display module 100.

[0241] The spacer 900 may be located between the rear surface of the display module 100 and the support member rear portion 310 of the support member 300. The rear surface of the spacer 900 may be attached to the support member rear portion 310 of the support member 300, and the front surface of the spacer 900 may be attached to the rear surface of the display module 100 and may contact the rear surface of the display module 100 in a non-contact type. For example, the spacer 900 may be formed of double-sided tape, double-sided foam pad, single-sided tape, single-sided foam pad, adhesive, and / or binder, but is not limited thereto. The spacer 900 may be referred to as an "attachment" or a "baffle", but the terms are not limited thereto.

[0242] Above reference Figures 6 to 14 The sound generating device described above can be applied to speakers and receivers such as electronic devices. The receiver can transmit the call voice based on the electronic device to the user's ear. For example, when the first sound generating modules 430 and 450 operate as a receiver such as an electronic device, the first sound generating modules 430 and 450 can receive a vibration driving signal from the sound processing circuit. For example, when the first sound generating modules 430 and 450 are applied to a receiver such as an electronic device, the first sound generating modules 430 and 450 can transmit the sound of the low-pitched vocal cords and the sound of the high-pitched vocal cords improved by the first vibration generating device and the second vibration generating device to the user, or the user can receive the improved sound of the low-pitched vocal cords and the improved sound of the high-pitched vocal cords, thereby providing a display device for providing enhanced call voice to the user. For example, when each of the first sound generating modules 430 and 450 and the second sound generating modules 530 and 550 operates as a speaker such as an electronic device, each of the first sound generating modules 430 and 450 and the second sound generating modules 530 and 550 can receive a vibration driving signal from the sound processing circuit. Therefore, the sound of the low-pitched vocal cords and the sound of the high-pitched voice improved by the first vibration generating module and the second vibration generating module can be transmitted to the user.

[0243] Figure 15A and Figure 15B is a rear view of a display panel according to another embodiment of the present disclosure.

[0244] Reference Figure 15A, the display device 70 according to an embodiment of the present disclosure may include a plurality of first sound generating modules 430 and 450 and a plurality of second sound generating modules 530 and 550. The display panel 110 may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side. For example, the first short side and the second short side may be in the lateral direction of the display panel 110, and the long side may be in the longitudinal direction of the display panel 110. The lateral direction and the longitudinal direction may be interchangeable. The display panel 110 may be divided into three regions with respect to the long side direction X or the longitudinal direction of the display panel 110 and may be divided into three regions with respect to the short side direction Y or the lateral direction of the display panel 110. For example, the long side of the display panel 110 may be divided into three equal parts with respect to the first longitudinal direction a1 and the second longitudinal direction a2. The short side of the display panel 110 may be divided into three equal parts with respect to the first lateral direction b1 and the second lateral direction b2. The display panel 110 may include four divided surfaces. For example, the upper left region where the first longitudinal direction a1 meets the first lateral direction b1 may be the first quarter surface (1). For example, the second quarter surface (2) may be the upper right region where the second longitudinal direction a2 meets the first lateral direction b1. For example, the third quarter surface (3) may be the lower right region where the second longitudinal direction a2 meets the second lateral direction b2. For example, the fourth quarter surface (4) may be the lower left region where the first longitudinal direction a1 meets the second lateral direction b2.

[0245] For example, the first sound generating modules 430 and 450 may not be disposed at the central portion of the rear surface of the display panel 110, but may be disposed on the second quarter surface (2) which is the upper right region where the second longitudinal direction a2 meets the first lateral direction b1. For example, the first sound generating modules 430 and 450 may be located in the region where the second longitudinal direction a2 meets the first lateral direction b1. For example, the first sound generating modules 430 and 450 may be disposed in the region divided according to the first lateral direction b1 and the second longitudinal direction a2. For example, the first sound generating modules 430 and 450 may be located in the one-third region of the display panel 110 in the lateral direction and the one-third region of the display panel 110 in the longitudinal direction. In Figure 15AIn [description], the first sound generation modules 430 and 450 are illustrated as being disposed at specific positions on the second quarter surface (2), but may be disposed at any position on the second quarter surface (2). For example, the first sound generation modules 430 and 450 may be located on the second quarter surface (2). For example, the second sound generation modules 530 and 550 may not be disposed at the central portion of the rear surface of the display panel 110, but may be located on the fourth quarter surface (4) which is the lower left region where the first longitudinal direction a1 and the second lateral direction b2 meet. For example, the second sound generation modules 530 and 550 may be located in the region where the first longitudinal direction a1 and the second lateral direction b2 meet. For example, the second sound generation modules 530 and 550 may be located in the region divided according to the first longitudinal direction a1 and the second lateral direction b2. For example, the second sound generation modules 530 and 550 may be disposed in the one-third region of the display panel 110 in the lateral direction and the one-third region of the display panel 110 in the longitudinal direction. In Figure 15A In [description], the second sound generation modules 530 and 550 are illustrated as being disposed at specific positions on the fourth quarter surface (4), but may be disposed at any position on the fourth quarter surface (4). For example, the second sound generation modules 530 and 550 may be located in the fourth quarter surface (4). The first sound generation modules 430 and 450 and the second sound generation modules 530 and 550 may be disposed symmetrically with respect to the diagonal of the display panel 110. When the sound generation modules are disposed in this manner, the sound generation modules can be disposed regardless of the size of the display panel. For example, the sound generation modules can be easily disposed in a display device including a display panel with a small size like a small electronic device or in a display device including a display panel with a large size like a television (TV). Therefore, stereophonic sound can be enhanced, and the sound generation modules can be applied to speakers.

[0246] For example, the center of each of the first vibration generation devices 431 and 451 of the first sound generation modules 430 and 450 may be spaced apart from the central region of the display module 100. For example, the center of each of the second vibration generation devices 431 and 451 of the second sound generation modules 530 and 550 may be spaced apart from the central region of the display module 100. For example, the distance d1 between the center of each of the first vibration generation devices 431 and 451 and the first short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110. For example, the distance d2 between the center of each of the second vibration generation devices 531 and 551 and the second short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110.

[0247] Reference Figure 15B, the display device 80 according to an embodiment of the present disclosure may further include a spacer 900. The spacer 900 may be disposed at the rear center portion CL1 of the display module 100. For example, the spacer 900 may be located between the first sound generating modules 430 and 450 and the second sound generating modules 530 and 550. For example, the spacer 900 may spatially separate or divide a first rear region A1 overlapping with the first sound generating modules 430 and 450 and a second rear region A2 overlapping with the second sound generating modules 530 and 550 on the rear surface of the display panel 110, thereby reducing or preventing interference between the sounds generated by the first rear region A1 and the second rear region A2. The spacer 900 may spatially separate or divide the first rear region A1 and the second rear region A2 respectively provided on the rear surface of the display module 100 (or the display panel 110) to reduce or prevent interference between the sounds generated by the first rear region A1 and the second rear region A2. Therefore, the spacer 900 may separate the sounds generated by the first vibration generating devices 431 and 451 and the second vibration generating devices 531 and 551 to reduce or prevent interference between the generated sounds, thereby allowing a 2.0 channel sound to be output to the front region with respect to the display module 100 based on the vibration of the display module 100. In addition, a sound generating module for enhancing stereophonic sound may be provided.

[0248] Figure 16A and Figure 16B is a rear view of a display panel according to another embodiment of the present disclosure.

[0249] Reference Figure 16A, the display device 120 according to an embodiment of the present disclosure may include a plurality of first sound generating modules 430 and 450 and a plurality of second sound generating modules 530 and 550. The display panel 110 may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side. For example, the first short side and the second short side may be in the lateral direction of the display panel 110, and the long side may be in the longitudinal direction of the display panel 110. The lateral direction and the longitudinal direction may be interchangeable. The display panel 110 may be divided into three regions with respect to the long side direction X or the longitudinal direction of the display panel 110, and may be divided into three regions with respect to the short side direction Y or the lateral direction of the display panel 110. For example, the long side of the display panel 110 may be divided into three equal parts with respect to the first longitudinal direction a1 and the second longitudinal direction a2. The short side of the display panel 110 may be divided into three equal parts with respect to the first lateral direction b1 and the second lateral direction b2. The display panel 110 may include four divided surfaces. For example, the upper left region where the first longitudinal direction a1 meets the first lateral direction b1 may be the first quarter surface (1). For example, the second quarter surface (2) may be the upper right region where the second longitudinal direction a2 meets the first lateral direction b1. For example, the third quarter surface (3) may be the lower right region where the second longitudinal direction a2 meets the second lateral direction b2. For example, the fourth quarter surface (4) may be the lower left region where the first longitudinal direction a1 meets the second lateral direction b2.

[0250] For example, the first sound generating modules 430 and 450 may not be disposed at the central portion of the rear surface of the display panel 110, but may be disposed on the first quarter surface (1) which is the upper left region where the first longitudinal direction a1 meets the first lateral direction b1. For example, the first sound generating modules 430 and 450 may be disposed in the region where the first longitudinal direction a1 meets the first lateral direction b1. For example, the first sound generating modules 430 and 450 may be disposed in the region divided according to the first lateral direction b1 and the first longitudinal direction a1. For example, the first sound generating modules 430 and 450 may be located in the one-third region of the display panel 110 in the lateral direction and the one-third region of the display panel 110 in the longitudinal direction. In Figure 16AIn [the figure], the first sound generation modules 430 and 450 are illustrated as being disposed at specific positions on the first quarter surface (1), or may be disposed at any position on the first quarter surface (1). For example, the first sound generation modules 430 and 450 may be disposed on the first quarter surface (1). For example, the second sound generation modules 530 and 550 may not be disposed at the central portion of the rear surface of the display panel 110, but may be disposed on the third quarter surface (3) which is the lower right region where the second longitudinal direction a2 and the second lateral direction b2 meet. For example, the second sound generation modules 530 and 550 may be located in the region where the second longitudinal direction a2 and the second lateral direction b2 meet. For example, the second sound generation modules 530 and 550 may be disposed in the region divided according to the second longitudinal direction a2 and the second lateral direction b2. For example, the second sound generation modules 530 and 550 may be disposed in the one-third region of the display panel 110 in the lateral direction and the one-third region of the display panel 110 in the longitudinal direction. In Figure 16A In [the figure], the second sound generation modules 530 and 550 are illustrated as being disposed at specific positions on the third quarter surface (3), or may be disposed at any position on the third quarter surface (3). For example, the second sound generation modules 530 and 550 may be disposed in the third quarter surface (3). The first sound generation modules 430 and 450 and the second sound generation modules 530 and 550 may be disposed symmetrically with respect to the diagonal of the display panel 110. When the sound generation modules are disposed in this way, the sound generation modules can be disposed regardless of the size of the display panel. For example, the sound generation modules can be easily disposed in a display device including a display panel with a small size like a small electronic device or a display device including a display panel with a large size like a television (TV). Therefore, the stereo sound can be enhanced, and the sound generation modules can be applied to speakers.

[0251] For example, the center of each of the first vibration generation devices 431 and 451 of the first sound generation modules 430 and 450 may be spaced apart from the central region of the display module 100. For example, the center of each of the second vibration generation devices 531 and 551 of the second sound generation modules 530 and 550 may be spaced apart from the central region of the display module 100. For example, the distance d1 between the center of each of the first vibration generation devices 431 and 451 and the first short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110. For example, the distance d2 between the center of each of the second vibration generation devices 531 and 551 and the second short side of the display panel 110 may be 1 / 4 to 1 / 3 of the long side of the display panel 110.

[0252] Reference Figure 16B, the display device 120 according to an embodiment of the present disclosure may further include a spacer 900. The spacer 900 may be disposed at the rear center portion CL1 of the display module 100. For example, the spacer 900 may be located between the first sound generating modules 430 and 450 and the second sound generating modules 530 and 550. For example, the spacer 900 may spatially separate or divide a first rear region A1 overlapping with the first sound generating modules 430 and 450 and a second rear region A2 overlapping with the second sound generating modules 530 and 550 on the rear surface of the display panel 110, thereby reducing or preventing interference between the sounds generated by the first rear region A1 and the second rear region A2. The spacer 900 may spatially separate or divide the first rear region A1 and the second rear region A2 respectively provided on the rear surface of the display module 100 (or the display panel 110) to prevent interference between the sounds generated by the first rear region A1 and the second rear region A2. Therefore, the spacer 900 may separate the sounds generated by the first vibration generating devices 431 and 451 and the second vibration generating devices 531 and 551 to reduce or prevent interference between the generated sounds, thereby allowing a 2.0 channel sound to be output to the front region with respect to the display module 100 based on the vibration of the display module 100. In addition, a sound generating module for enhancing stereo sound may be provided.

[0253] Figure 17 Illustrates the sound output characteristics of a sound generating module according to an embodiment of the present disclosure.

[0254] In Figure 17 , the dashed line represents the sound output characteristics of a sound generating module including a vibration generating device having a longer length in the lateral direction than in the longitudinal direction and disposed at the center of the rear surface of the Figure 13 display panel. The single-dot dashed line represents the sound output characteristics of a sound generating module including a vibration generating device having a length equal to that in the longitudinal direction in the lateral direction and disposed at the center of the rear surface of the Figure 13 display panel. The double-dot dashed line represents Figure 13 the sound output characteristics of a sound generating module including a vibration generating device having a length equal to that in the longitudinal direction in the lateral direction. The solid line represents Figure 15A the sound output characteristics of a sound generating module including a vibration generating device having a length equal to that in the longitudinal direction in the lateral direction. In Figure 17 , the horizontal axis (x-axis) represents the frequency in hertz (Hz), and the vertical axis (y-axis) represents the sound pressure level (SPL) in decibels (dB).

[0255] The sound output characteristics can be measured by a sound analysis device. The sound analysis device may include: a sound card that sends sound to or receives sound from a control personal computer (PC); an amplifier that amplifies a signal generated from the sound card and transmits the amplified signal to a sound generation module; and a microphone that collects sound generated by the sound generation module in a display panel. The sound collected by the microphone can be input to the control PC through the sound card, and a control program can check the input sound to analyze the sound of the sound generation module.

[0256] The sound output characteristics have been measured in an anechoic chamber closed in all directions, and the measurement equipment has used the APX525 of Audio Precision Company. The measurement has been performed under the conditions that the driving voltage is 30Vpp and the sound pressure level measurement distance to the center of the sound generation module is about 5 cm. The applied frequency signal has been applied as a sine sweep in the range of 20 Hz to 20 kHz, and 1 / 3 octave smoothing has been performed on the measurement results. The measurement method is not limited to this.

[0257] Reference Figure 17 , compared with the case of a sound generation device in which the length in the lateral direction is longer than the length in the longitudinal direction (represented by a dashed line), it can be seen that in the case of a sound generation device in which the length in the lateral direction is equal to the length in the longitudinal direction (represented by a single-dot dashed line), the sound pressure level is increased at about 200 Hz or less Hz corresponding to the lower vocal range. Therefore, as described in the above reference Figure 5 , it can be seen that the sound generation module of the sound generation device including the length in the lateral direction equal to the length in the longitudinal direction increases the sound pressure level.

[0258] For example, compared with the sound generation module (represented by a single-dot dashed line) provided at the center of the rear surface of the display panel, it can be seen that in the sound generation module (represented by a double-dot dashed line) provided in the upper part of the rear surface of the display panel, the sound pressure level is increased at about 800 Hz corresponding to the middle pitch vocal range and at about 1 kHz or more Hz corresponding to the high pitch vocal range. Therefore, when the sound generation module is provided in the upper part of the rear surface of the display panel, it can be seen that the sound pressure level is increased.

[0259] For example, compared to the sound generating module (represented by the double-dotted line) disposed at the center of the rear surface of the display panel, it can be seen that in the sound generating module (represented by the solid line) disposed in the upper portion of the rear surface of the display panel and disposed in the diagonal direction, the sound pressure level is increased in approximately 200 Hz or less Hz corresponding to the low-pitched vocal cords. Additionally, it can be seen that the sound pressure level is increased in approximately 800 Hz corresponding to the mid-pitched vocal cords and approximately 1 kHz or more Hz corresponding to the high-pitched vocal cords. Therefore, when the sound generating module is disposed in the upper portion of the rear surface of the display panel and disposed in the diagonal direction, it can be seen that the sound pressure level is increased in the low-pitched vocal cords and the high-pitched vocal cords. Additionally, when the sound generating module represented by the solid line is applied to a speaker of an electronic device or the like, it can be seen that the frequency response is flat compared to other sound generating modules. For example, it can be seen that the sound generating module represented by the solid line has flat sound pressure characteristics in the total frequency domain, thereby providing a display device including a speaker having a flat sound pressure level in the total frequency domain.

[0260] Figure 18A and Figure 18B illustrate the sound output characteristics of the sound generating module according to an embodiment of the present disclosure.

[0261] Figure 18A 、 Figure 18B 、 Figure 19A 、 Figure 19B 、 Figure 20A and Figure 20B show the results obtained by performing measurements for testing stereo sound or the sound separation sensitivity of the left and right sound generating modules. In Figure 18A and Figure 18B , the sound output characteristics of the sound generating module represented by the single dotted line of Figure 17 are shown. The single dotted line shows the sound output characteristics of the left sound generating module, and the single thick dotted line shows the sound output characteristics of the right sound generating module. Figure 18A shows an example in which a signal is applied to the first sound generating module, and Figure 18B shows an example in which a signal is applied to the second sound generating module. In Figure 18A and Figure 18B , the horizontal axis (x-axis) represents frequency in Hertz (Hz), and the vertical axis (y-axis) represents sound pressure level (SPL) in decibels (dB). The method of measuring the sound output characteristics is the same as the description given above with reference to Figure 17 , and thus, its detailed description is omitted.

[0262] Reference Figure 18A and Figure 18B, it can be seen that the sound output characteristics of the right sound generating module and the sound output characteristics of the left sound generating module are shown symmetrically. However, it can be seen that the sound pressure level decreases in a frequency of about 2.5 kHz or more.

[0263] Figure 19A and Figure 19B The sound output characteristics of the sound generating module according to the embodiment of the present disclosure are illustrated.

[0264] exist Figure 19A and Figure 19B In the Figure 17 The double-dashed line shows the sound output characteristics of the left sound generating module, and the double-dashed bold line shows the sound output characteristics of the right sound generating module. Figure 19A shows an example where a signal is applied to a first sound generating module, and Figure 19B An example in which a signal is applied to the second sound generating module is shown. Figure 19A and Figure 19B In the above, the horizontal axis (x-axis) represents the frequency in Hertz (Hz), and the vertical axis (y-axis) represents the sound pressure level (SPL) in decibels (dB). Figure 17 The descriptions given are the same, and therefore, detailed descriptions thereof are omitted.

[0265] refer to Figure 19A and Figure 19B , it can be seen that the sound output characteristics of the right sound generating module and the sound output characteristics of the left sound generating module are shown symmetrically. However, it can be seen that the sound pressure level does not increase in a frequency of about 1 kHz or more.

[0266] Figure 20A and Figure 20B The sound output characteristics of the sound generating module according to the embodiment of the present disclosure are illustrated.

[0267] exist Figure 20A and Figure 20B In the Figure 17 The double-dashed line shows the sound output characteristics of the left sound generating module, and the double-dashed bold line shows the sound output characteristics of the right sound generating module. Figure 20A shows an example where a signal is applied to a first sound generating module, and Figure 20B An example in which a signal is applied to the second sound generating module is shown. Figure 20A and Figure 20BIn this case, the horizontal axis (x-axis) represents frequency in hertz (Hz) and the vertical axis (y-axis) represents sound pressure level (SPL) in decibels (dB). The method for measuring the sound output characteristics is the same as the description given above with reference to Figure 17 and thus, a detailed description thereof will be omitted.

[0268] With reference to Figure 20A and Figure 20B , it can be seen that the sound output characteristics of the right sound generation module and the sound output characteristics of the left sound generation module are shown symmetrically. Accordingly, the left sound and the right sound can be separated from each other, and thus, stereophonic sound can be enhanced. In Figure 18A and Figure 18B , it can be seen that the sound pressure level decreases at frequencies of about 2.5 kHz or greater. In comparison, it can be seen that in the sound generation module according to an embodiment of the present disclosure, the sound pressure level is increased at frequencies of about 2.5 kHz or greater. In Figure 19A and Figure 19B , it can be seen that the sound pressure level does not increase at frequencies of about 1 kHz or greater. In comparison, it can be seen that in the sound generation module according to an embodiment of the present disclosure, the sound pressure level is increased at frequencies of about 1 kHz or greater. Accordingly, in the sound generation module according to an embodiment of the present disclosure, it can be seen that stereophonic sound is enhanced, and in addition, the sound pressure level is increased at frequencies of mid-high pitched vocal cords.

[0269] The sound generation module according to an embodiment of the present disclosure can be applied as a sound generation module in a display device. The display device according to an 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 curved surface 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 signage device, a game console, a notebook computer, a monitor, a camera, a video camera, a household appliance, etc. In addition, the sound generation device according to an embodiment of the present disclosure can be applied to an organic light emitting illumination device or an inorganic light emitting illumination device. When the sound generation module is applied to an illumination device, the sound generation module can serve as both an illumination device and a speaker. The sound generation module according to an embodiment of the present disclosure can be applied to a receiver and / or a speaker such as an electronic device.

[0270] A display device according to an embodiment of the present disclosure will be described below.

[0271] According to an embodiment of the present disclosure, a display device includes: a display module including a display panel configured to display an image; and a first sound generating module located on a rear surface of the display panel, wherein the first sound generating module includes: a first vibration generating device; a circuit board located on a lower surface of the first vibration generating device; a first adhesive member located between the circuit board and the first vibration generating device; and a second adhesive member located between the first vibration generating device and the display panel, and an elastic modulus of the second adhesive member is different from an elastic modulus of the first adhesive member.

[0272] For example, in the display device according to an embodiment of the present disclosure, the elastic modulus of the first adhesive member may be greater than the elastic modulus of the second adhesive member.

[0273] For example, in the display device according to an embodiment of the present disclosure, the first adhesive member may include a material having conductivity.

[0274] For example, in the display device according to an embodiment of the present disclosure, a size of the circuit board may be the same as a size of the first vibration generating device.

[0275] For example, in the display device according to an embodiment of the present disclosure, the circuit board may include: a base film located on a lower surface of the first vibration generating device; a first electrode and a second electrode respectively located on upper and lower surfaces of the base film; and a passivation layer located on each of the upper and lower surfaces of the base film.

[0276] For example, in the display device according to an embodiment of the present disclosure, the base film includes a flexible printed circuit board including polyimide.

[0277] For example, in the display device according to an embodiment of the present disclosure, the display panel may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and a distance between a center of the first vibration generating device and the first short side of the display panel may be 1 / 4 to 1 / 3 of the long side of the display panel.

[0278] For example, the display device according to an embodiment of the present disclosure may further include a second sound generating module located on the rear surface of the display panel, and the second sound generating module includes a second vibration generating device.

[0279] For example, in a display device according to an embodiment of the present disclosure, the display panel may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the second vibration generating device and the second short side of the display panel may be 1 / 4 to 1 / 3 of the long side of the display panel.

[0280] For example, in a display device according to an embodiment of the present disclosure, the first sound generating module may be symmetric with respect to the central portion of the display module and the second sound generating module.

[0281] For example, in a display device according to an embodiment of the present disclosure, the display panel may include: a first short side; a second short side facing the first short side; a long side perpendicular to the first short side or the second short side; a first longitudinal direction and a second longitudinal direction that divide the first short side or the second short side into three equal parts; and a first transverse direction and a second transverse direction that divide the long side into three equal parts. The first sound generating module may be located in the area divided according to the second longitudinal direction and the first transverse direction or in the area divided according to the first longitudinal direction and the first transverse direction, and the second sound generating module may be located in the area divided according to the first longitudinal direction and the second transverse direction or in the area divided according to the second longitudinal direction and the second transverse direction.

[0282] For example, in a display device according to an embodiment of the present disclosure, each of the first vibration generating device and the second vibration generating device may include a piezoelectric material layer.

[0283] For example, a spacer may be provided at the central portion of the rear surface of the display module in a display device according to an embodiment of the present disclosure.

[0284] For example, in a display device according to an embodiment of the present disclosure, the display module may include a first rear area overlapping with the first sound generating module and a second rear area overlapping with the second sound generating module, and the spacer may be located between the first rear area and the second rear area.

[0285] According to an embodiment of the present disclosure, a display device includes: a display module including a display panel configured to display an image; and a first sound generating module located on a rear surface of the display panel, wherein the first sound generating module includes: a first vibration generating device; a circuit board located on a lower surface of the first vibration generating device; a first adhesive member and a third adhesive member located between the circuit board and the first vibration generating device; and a member located between the first adhesive member and the third adhesive member.

[0286] For example, in the display device according to an embodiment of the present disclosure, the material of the first adhesive member may be different from the material of the third adhesive member.

[0287] For example, the display device according to an embodiment of the present disclosure may further include at least one electrode located on a lower surface of the first vibration generating device, wherein the third adhesive member may be located on the at least one electrode.

[0288] For example, the display device according to an embodiment of the present disclosure may further include a second adhesive member located between the first vibration generating device and the display panel.

[0289] For example, in the display device according to an embodiment of the present disclosure, the elastic modulus of the second adhesive member may be different from the elastic modulus of the first adhesive member.

[0290] For example, in the display device according to an embodiment of the present disclosure, the size of the circuit board may be the same as the size of the first vibration generating device.

[0291] For example, in the display device according to an embodiment of the present disclosure, the circuit board may include: a substrate film located on a lower surface of the first vibration generating device; a first electrode and a second electrode respectively located on upper and lower surfaces of the substrate film; and a passivation layer located on each of the upper and lower surfaces of the substrate film.

[0292] For example, in the display device according to an embodiment of the present disclosure, each of the first electrode and the second electrode may be attached to a lower surface of the first vibration generating device through the third adhesive member.

[0293] For example, in the display device according to an embodiment of the present disclosure, the first adhesive member may be located between the passivation layer on the upper surface of the substrate film and the first vibration generating device.

[0294] For example, the display device according to an embodiment of the present disclosure may further include a fourth adhesive member disposed between the circuit board and the member.

[0295] For example, in the display device according to an embodiment of the present disclosure, the display panel may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the first vibration generating device and the first short side of the display panel may be 1 / 4 to 1 / 3 of the long side of the display panel.

[0296] For example, the display device according to an embodiment of the present disclosure may further include a second sound generating module located on the rear surface of the display panel, and the second sound generating module includes a second vibration generating device.

[0297] For example, in the display device according to an embodiment of the present disclosure, the display panel may include a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the second vibration generating device and the second short side of the display panel may be 1 / 4 to 1 / 3 of the long side of the display panel.

[0298] For example, in the display device according to an embodiment of the present disclosure, the first sound generating module may be symmetric with the second sound generating module with respect to the central portion of the display module.

[0299] For example, in the display device according to an embodiment of the present disclosure, the display panel may include: a first short side; a second short side facing the first short side; a long side perpendicular to the first short side or the second short side; a first longitudinal direction and a second longitudinal direction that divide the first short side or the second short side into three equal parts; and a first transverse direction and a second transverse direction that divide the long side into three equal parts, the first sound generating module may be located in the area divided according to the second longitudinal direction and the first transverse direction or in the area divided according to the first longitudinal direction and the first transverse direction, and the second sound generating module may be located in the area divided according to the first longitudinal direction and the second transverse direction or in the area divided according to the second longitudinal direction and the second transverse direction.

[0300] For example, the display device according to an embodiment of the present disclosure may further include a spacer disposed at the central portion of the rear surface of the display module.

[0301] For example, in a display device according to an embodiment of the present disclosure, the display module may include a first rear region overlapping with the first sound generating module and a second rear region overlapping with the second sound generating module, and the spacer may be located between the first rear region and the second rear region.

[0302] According to an embodiment of the present disclosure, a sound generating module applied to a display device including a display panel, the sound generating module being disposed on a rear surface of the display panel, the sound generating module including: a vibration generating device; a circuit board located on a lower surface of the vibration generating device; a first adhesive member located between the circuit board and the vibration generating device; and a second adhesive member located between the vibration generating device and the display panel, the elastic modulus of the second adhesive member being different from the elastic modulus of the first adhesive member.

[0303] According to an embodiment of the present disclosure, a sound generating module applied to a display device including a display panel, the sound generating module being disposed on a rear surface of the display panel, the sound generating module including: a vibration generating device; a circuit board located on a lower surface of the vibration generating device; a first adhesive member and a third adhesive member located between the circuit board and the vibration generating device; and a member located between the first adhesive member and the third adhesive member.

[0304] For example, in a sound generating module according to an embodiment of the present disclosure, the circuit board serves as a reinforcing member of the sound generating module.

[0305] For example, in a sound generating module according to an embodiment of the present disclosure, the circuit board is formed of a polyimide-based material.

[0306] As described above, a display device according to an embodiment of the present disclosure may include the sound generating device that vibrates the display panel to generate sound, and thus, the sound may be output to a front region in front of the display panel. Therefore, the immersive experience of a viewer watching an image displayed by the display device can be enhanced.

[0307] In addition, since the display device according to an embodiment of the present disclosure includes the sound generating module including adhesive members having different elastic moduli, the durability of the sound generating module against vibration or external shock can be improved, and the durability of the sound generating module against attachment / detachment can be improved.

[0308] In addition, since the display device according to an embodiment of the present disclosure includes the sound generating module including the adhesive member and the members having different elastic moduli, the durability of the sound generating module against vibration or external shock can be improved, the durability of the sound generating module against attachment / detachment can be improved, and the adhesive surface located between the circuit board and the adhesive member can be uniform, thereby reducing or preventing defects in the circuit board.

[0309] It will be apparent to those skilled in the art that various modifications and variations can be made in the display device of the present disclosure without departing from the technical concept or scope of the present disclosure. Accordingly, the embodiments of the present disclosure are intended to cover modifications and variations of the present disclosure as long as they fall within the scope of the appended claims and their equivalents.

Claims

1. A sound generating device, the sound generating device comprises: a diaphragm; and a first sound generating device located on the rear surface of the diaphragm, wherein the first sound generating device comprises: a first vibration generating device; a circuit board located on the lower surface of the first vibration generating device; a first bonding member located between the circuit board and the first vibration generating device; and a second bonding member located between the first vibration generating device and the diaphragm, the elastic modulus of the first bonding member being greater than that of the second bonding member, wherein the circuit board comprises: a base film located on the lower surface of the first vibration generating device; a first electrode and a second electrode located on the upper surface and the lower surface of the base film respectively; and a passivation layer located on each of the upper surface and the lower surface of the base film.

2. The sound generating device according to claim 1, wherein the base film comprises a flexible printed circuit board including polyimide.

3. The sound generating device according to claim 1, wherein the first bonding member comprises a conductive material.

4. The sound generating device according to claim 1, wherein the size of the circuit board is the same as that of the first vibration generating device.

5. The sound generating device according to claim 1, wherein the diaphragm includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the first vibration generating device and the first short side of the diaphragm is 1 / 4 to 1 / 3 of the long side of the diaphragm.

6. The sound generating device according to claim 1, the sound generating device further comprises a second sound generating device located on the rear surface of the diaphragm, the second sound generating device including a second vibration generating device.

7. The sound generating device according to claim 6, wherein the first sound generating device is symmetric with the second sound generating device with respect to the central portion of the diaphragm.

8. The sound generating device according to claim 6, wherein each of the first vibration generating device and the second vibration generating device includes a piezoelectric material layer.

9. The sound generating device according to claim 6, the sound generating device further comprises a spacer disposed at the central portion of the rear surface of the diaphragm.

10. The sound generating device according to claim 6, wherein the diaphragm includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the first vibration generating device and the second short side of the diaphragm is 1 / 4 to 1 / 3 of the long side of the diaphragm.

11. A sound generating device, the sound generating device comprises: a diaphragm; and The first sound generating device, which is located on the rear surface of the diaphragm, wherein the first sound generating device includes: a first vibration generating device having a piezoelectric material layer; a circuit board, which is located on the lower surface of the first vibration generating device; a first adhesive member and a third adhesive member, which are located between the circuit board and the first vibration generating device; a second adhesive member, which is located between the first vibration generating device and the diaphragm; and a structural member located between the first adhesive member and the third adhesive member, wherein the circuit board includes: a base film, which is located on the lower surface of the first vibration generating device; a first electrode and a second electrode, which are respectively located on the upper surface and the lower surface of the base film; and a passivation layer, which is located on each of the upper surface and the lower surface of the base film, and wherein the elastic modulus of the first adhesive member is greater than that of the second adhesive member.

12. The sound generating device according to claim 11, further comprising at least one electrode located on the lower surface of the first vibration generating device, wherein, the third adhesive member is located on at least one of the first electrode and the second electrode.

13. The sound generating device according to claim 11, wherein, each of the first electrode and the second electrode is attached to the lower surface of the first vibration generating device through the third adhesive member.

14. The sound generating device according to claim 11, further comprising a fourth adhesive member located between the circuit board and the structural member.

15. The sound generating device according to claim 11, wherein, the diaphragm includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the first vibration generating device and the first short side of the diaphragm is 1 / 4 to 1 / 3 of the long side of the diaphragm.

16. The sound generating device according to claim 11, further comprising a second sound generating device located on the rear surface of the diaphragm, and the second sound generating device includes a second vibration generating device.

17. The sound generating device according to claim 16, wherein, the first sound generating device is symmetric with the second sound generating device with respect to the central portion of the diaphragm.

18. The sound generating device according to claim 16, wherein, the diaphragm includes a first short side, a second short side facing the first short side, and a long side perpendicular to the first short side or the second short side, and the distance between the center of the second vibration generating device and the second short side of the diaphragm is 1 / 4 to 1 / 3 of the long side of the diaphragm.

19. The sound generating device according to claim 16, wherein the sound generating device further includes a spacer disposed at a central portion of a rear surface of the diaphragm.

20. The sound generating device according to claim 19, wherein, the diaphragm includes a first rear region overlapping with the first sound generating means and a second rear region overlapping with the second sound generating means; and the spacer is located between the first rear region and the second rear region.

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