Sound generating equipment

Abstract

Sound generating device. A display device includes: a display module including a display panel configured to display an image; and a first sound generating device on a rear surface of the display panel, the first sound generating device including a first vibration generating device and a second vibration generating device adjacent to the first vibration generating device, the first vibration generating device being configured to vibrate a central area of the first sound generating device based on a signal applied to the first sound generating device, and the second vibration generating device being configured to vibrate a periphery of the display panel based on the applied signal.

Description

[0001] This application is a divisional application of the patent application with the application date of November 19, 2019, application number 201911133509.2, and invention name “Display Device”. Technical Field

[0002] The present disclosure relates to a display device. Background Art

[0003] Display devices are used as screens for displaying images in household appliances or electronic devices such as televisions (TVs), monitors, notebook computers, smartphones, tablet computers, electronic organizers, electronic boards, wearable devices, wristwatches, portable information devices, navigation devices, and automobile control display devices. The display device includes a display panel for displaying images and a sound device for outputting sounds associated with the images.

[0004] Recently, there has been a trend toward larger screens in display devices, but demands for lightness and thinness are increasing. However, since the display device should include sufficient space for embedding a sound device (e.g., a speaker) for outputting sound, it is difficult to reduce weight and reduce thickness. In addition, the sound generated by the sound device embedded in the display device is output in a rearward or lateral direction relative to the main body of the display device, rather than in a forward direction relative to the display panel. Therefore, the sound is not transmitted toward the viewer (or user) who is viewing the image in front of the display device, thereby hindering the immersive experience of the viewer viewing the image. Summary of the Invention

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

[0006] Therefore, the inventors recognized the above problem and conducted various experiments to improve the sound quality by changing the propagation direction of sound toward the front surface of the display panel when an image is viewed in front of the display panel. Through various experiments, the inventors realized a display device with a new structure that outputs sound that propagates toward the front surface of the display panel, thereby improving the sound quality.

[0007] An aspect of the present disclosure provides a display apparatus which vibrates a display panel to output sound to a forward area in front of the display panel, thereby enhancing the sound.

[0008] 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 concepts provided herein. Other features and aspects of the inventive concepts may be realized and achieved by the structure particularly pointed out in or inferable from the written description and claims and the accompanying drawings.

[0009] To achieve these and other aspects of the present inventive concept, as specifically implemented and broadly described, a display device includes: a display module, which includes a display panel configured to display an image; and a first sound generating device on a rear surface of the display panel, the first sound generating device including a first vibration generating device and a second vibration generating device adjacent to the first vibration generating device, the first vibration generating device being configured to vibrate a central area of the first sound generating device based on a signal applied to the first sound generating device, and the second vibration generating device being configured to vibrate a periphery of the display panel based on the applied signal.

[0010] On the other hand, a display device includes: a display module, which includes a display panel configured to display an image; and a first sound generating device on a rear surface of the display panel, wherein the first sound generating device includes a first vibration generating device and a second vibration generating device, the second vibration generating device being configured to vibrate at a phase different from that of the first vibration generating device.

[0011] Other systems, methods, features, and advantages will be or will become apparent to those skilled in the art upon studying the following figures and detailed description. All such additional systems, methods, features, and advantages are intended to be included herein, to be within the scope of the present disclosure, and to be protected by the appended claims. Nothing in this section should be construed as limiting these claims. Additional aspects and advantages are discussed below in conjunction with the embodiments of the present disclosure. It will be understood that both the above general description and the following detailed description of the present disclosure are exemplary and illustrative and are intended to provide further explanation of the claimed disclosure.

[0012] Note 1. A display device, comprising:

[0013] A display module including a display panel configured to display an image; and

[0014] a first sound generating device on the rear surface of the display panel,

[0015] Wherein, the first sound generating device includes:

[0016] a first vibration generating device; and

[0017] a second vibration generating device adjacent to the first vibration generating device, and

[0018] The first vibration generating device is configured to vibrate a central area of the first sound generating device based on a signal applied to the first sound generating device, and the second vibration generating device is configured to vibrate a periphery of the display panel based on the applied signal.

[0019] Supplementary note 2. The display device according to Supplementary note 1, wherein the first vibration generating device is surrounded by the second vibration generating device spaced apart from the first vibration generating device.

[0020] Supplementary note 3. The display device according to Supplementary note 1, wherein a phase of a signal applied to the first vibration generating device is opposite to a phase of a signal applied to the second vibration generating device.

[0021] Supplement 4. The display device according to Supplement 1, wherein:

[0022] The first vibration generating device is configured to improve the sound of low-pitched vocal cords; and

[0023] The second vibration generating device is configured to improve the sound of high-pitched vocal cords.

[0024] Supplementary note 5. The display device according to Supplementary note 1, wherein each of the first vibration generating device and the second vibration generating device includes a piezoelectric material layer.

[0025] Supplementary note 6. The display device according to Supplementary note 1, wherein:

[0026] 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

[0027] A distance between a center of the first vibration generating device and the first short side of the display panel is 1 / 4 to 1 / 3 of the distance between the long side of the display panel.

[0028] Note 7. The display device according to Note 1 further includes a second sound generating device separated from the first sound generating device in the rear surface of the display panel, the second sound generating device including a fourth vibration generating device and a third vibration generating device separated from and surrounded by the fourth vibration generating device.

[0029] Supplementary note 8. The display device according to Supplementary note 7, wherein a phase of a signal applied to the third vibration generating device is opposite to a phase of a signal applied to the fourth vibration generating device.

[0030] Supplementary note 9. The display device according to Supplementary note 7, wherein:

[0031] 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

[0032] A distance between a center of the third vibration generating device and the second short side of the display panel is 1 / 4 to 1 / 3 of the distance between the long side of the display panel.

[0033] Supplementary note 10. The display device according to Supplementary note 7, wherein the first sound generating device is provided symmetrically to the second sound generating device with respect to a central portion of the display module.

[0034] Supplementary note 11. The display device according to Supplementary note 7, further comprising a partition in a rear center portion of the display module.

[0035] Supplementary note 12. The display device according to Supplementary note 11, wherein:

[0036] The display module includes a first rear area overlapping the first sound generating device and a second rear area overlapping the second sound generating device; and

[0037] The partition is located between the first rear area and the second rear area.

[0038] Supplement 13. The display device according to Supplement 1, further comprising:

[0039] A supporting member configured to accommodate the display module, the supporting member including a vibration device exposure portion protruding from the supporting member, wherein the first sound generating device is accommodated in the vibration device exposure portion.

[0040] Note 14. A display device, comprising:

[0041] A display module including a display panel configured to display an image; and

[0042] a first sound generating device on the rear surface of the display panel,

[0043] Wherein, the first sound generating device includes:

[0044] a first vibration generating device; and

[0045] A second vibration generating device is configured to vibrate at a phase different from a phase of the first vibration generating device.

[0046] Supplementary note 15. The display device according to Supplementary note 14, wherein one of the first vibration generating device and the second vibration generating device is configured to vibrate in anti-phase.

[0047] Supplementary note 16. The display device according to Supplementary note 14, wherein the first vibration generating device is surrounded by the second vibration generating device spaced apart from the first vibration generating device.

[0048] Supplement 17. The display device according to Supplement 14, wherein:

[0049] The first sound generating device is configured to output sound in the audible frequency domain;

[0050] The first vibration generating device is configured to emphasize the sound of the low-pitched vocal range; and

[0051] The second vibration generating device is configured to emphasize the sound of high-pitched vocal cords.

[0052] Supplement 18. The display device according to Supplement 14, wherein:

[0053] 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

[0054] A distance between a center of the first vibration generating device and the first short side of the display panel is 1 / 4 to 1 / 3 of the distance between the long side of the display panel.

[0055] Supplement 19. The display device according to Supplement 14, further comprising:

[0056] A second sound generating device is provided in the rear surface of the display panel and is spaced apart from the first sound generating device. The second sound generating device includes a fourth vibration generating device and a third vibration generating device spaced apart from and surrounded by the fourth vibration generating device.

[0057] Supplement 20. The display device according to Supplement 19, wherein:

[0058] The second sound generating device is configured to output sound in the audible frequency domain;

[0059] The third vibration generating device is configured to enhance the sound of the low-pitched vocal range; and

[0060] The fourth vibration generating device is configured to emphasize the sound of the high-pitched vocal cords.

[0061] Supplement 21. The display device according to Supplement 19, wherein:

[0062] 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

[0063] A distance between a center of the third vibration generating device and the second short side of the display panel is 1 / 4 to 1 / 3 of the distance between the long side of the display panel.

[0064] Supplementary note 22. The display apparatus according to Supplementary note 19, wherein the first sound generating device is provided symmetrically to the second sound generating device with respect to a central portion of the display module.

[0065] Supplementary note 23. The display device according to Supplementary note 19, further comprising a partition in a rear center portion of the display module.

[0066] Supplementary note 24. The display device according to Supplementary note 23, wherein:

[0067] The display module includes a first rear area overlapping the first sound generating device and a second rear area overlapping the second sound generating device; and

[0068] The partition is located between the first rear area and the second rear area.

[0069] Supplement 25. The display device according to Supplement 14, further comprising:

[0070] A supporting member configured to accommodate the display module, the supporting member including a vibration device exposure portion protruding from the supporting member, wherein the first sound generating device is accommodated in the vibration device exposure portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain various principles.

[0072] Figure 1 is a perspective view illustrating a display device according to an embodiment of the present disclosure.

[0073] Figure 2 It is along Figure 1 A cross-sectional view taken along line II' is shown.

[0074] Figure 3 yes Figure 1 Rear view of the display panel shown.

[0075] Figures 4A to 4Fis a diagram for describing vibration of the sound generating device according to an embodiment of the present disclosure.

[0076] Figure 5 is a perspective view illustrating a display device according to another embodiment of the present disclosure.

[0077] Figure 6 It is along Figure 5 A cross-sectional view taken along line II-II' is shown.

[0078] Figure 7 yes Figure 5 Rear view of the display panel shown.

[0079] Figure 8 is a rear view of a display device according to another embodiment of the present disclosure.

[0080] Figure 9 Sound output characteristics of a display device according to an embodiment of the present disclosure are shown.

[0081] Throughout the drawings and detailed description, unless otherwise described, the same drawing reference numerals should be understood to refer to the same elements, features, and structures. The relative sizes and depictions of these elements may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0082] Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations associated with this document will be omitted when they are determined to unnecessarily obscure the subject matter of the inventive concept. The described progression of processing steps and / or operations is an example; however, except for steps and / or operations that must occur in a particular order, the order of steps and / or operations is not limited to the order set forth herein, but may be changed as known in the art. Like reference numerals refer to like elements throughout. The names of the various elements used in the following description have been selected solely for convenience in writing the specification and may therefore differ from those used in the actual product.

[0083] The advantages and features of the present disclosure and their implementation methods will be illustrated by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be specifically implemented in different forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is limited only by the scope of the claims.

[0084] The shapes, sizes, ratios, angles and quantities disclosed in the drawings used to describe the embodiments of the present disclosure are merely examples, and therefore, the present disclosure is not limited to the details shown. In the following description, when a detailed description of a related known function or configuration is determined to be unnecessary to obscure the focus of the present disclosure, the detailed description of such a known function or configuration may be omitted. When the terms "including" and "having" described in this specification are used, another part may be added unless a more restrictive term such as "only" is used. Unless mentioned to the contrary, a term in the singular may include a plural form.

[0085] When interpreting an element, the element is interpreted as including the error or tolerance range even in the case where there is no explicit description of such error or tolerance range.

[0086] When describing a positional relationship, when the positional relationship between two parts is described as "on," "above," "below," and "beside," one or more other parts may be disposed between the two parts, unless more restrictive terms such as "immediately next to" or "directly" are used.

[0087] When describing temporal relationships, for example, when a time sequence is described as "after," "following," "next to," and "before," discontinuous situations may be included unless more restrictive terms such as "immediately," "immediately," or "directly" are used.

[0088] It will be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of this disclosure.

[0089] When describing elements of the present disclosure, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are used only to distinguish the corresponding elements from other elements, and the nature, order, or priority of the corresponding elements are not limited by these terms. It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or directly connected to the other element or layer, or there can be intervening elements or layers. In addition, it should be understood that when one element is disposed on or under another element, this can refer to a situation where the elements are disposed in direct contact with each other, but can refer to a situation where the elements are not in direct contact with each other.

[0090] The term "at least one" should be understood to include any and all combinations of one or more of the relevant listed items. For example, the meaning of "at least one of the first, second, and third items" refers to the combination of all items proposed from two or more of the first, second, and third elements, as well as the first, second, or third item.

[0091] In the description of the embodiments, when a structure is described as being located "on or above" or "below or below" another structure, the description should be interpreted as including a case where the structures are in contact with each other and a case where a third structure is provided therebetween. Unless otherwise specified, the sizes and thicknesses of the various elements shown in the drawings are given merely for convenience of description, and the embodiments of the present disclosure are not limited thereto.

[0092] As will be fully understood by those skilled in the art, the features of the various embodiments of the present disclosure may be coupled or combined with each other in part or in whole, and may interoperate with each other in different ways and be driven technically. The embodiments of the present disclosure may be implemented independently of each other, or may be implemented together in a mutually dependent relationship.

[0093] In the present disclosure, examples of display devices may include narrowly defined display devices such as organic light emitting display (OLED) modules or liquid crystal modules (LCMs), which include a display panel and a driver for driving the display panel. In addition, examples of display devices may include packaged devices (or packaged devices) or packaged electronic devices, such as notebook computers, TVs, computer monitors, devices including automotive devices or other types of devices for vehicles, or mobile electronic devices (e.g., smartphones or electronic tablets), which are complete products (or final products) including LCMs or OLED modules.

[0094] Therefore, in the present disclosure, examples of display devices may include a narrow-sense display device itself (eg, an LCM or OLED module) and a package device (an end-consumer device or application product including an LCM or OLED module).

[0095] In some embodiments, an LCM or OLED module including a display panel and a driver may be referred to as a narrowly defined display device, and an electronic device as a final product including the LCM or OLED module may be referred to as a package device. For example, a narrowly defined display device may include a display panel such as an LCD or OLED and a source printed circuit board (PCB) serving as a controller for driving the display panel. The package device may also include a package PCB, which is a package controller electrically connected to the source PCB to overall control the package device.

[0096] The display panel applied to the embodiment of the present disclosure may 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, and is not limited to the specific display panel that vibrates to output sound by the sound generating device according to the embodiment of the present disclosure. In addition, the shape or size of the display panel applied to the display device according to the embodiment of the present disclosure is not limited.

[0097] 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 in a plurality of pixel areas defined by the intersection of the gate lines and the data lines. In addition, the display panel may include: an array substrate including a thin film transistor (TFT) as a switching element for adjusting the 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 interposed between the array substrate and the upper substrate.

[0098] In addition, if the display panel is an organic light-emitting display panel, the display panel may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels respectively arranged in a plurality of pixel areas defined by the intersection of the gate lines and the data lines. In addition, the display panel may include: an array substrate, which includes a TFT as an element for selectively applying a voltage to each pixel; an organic light-emitting device layer on the array substrate; and an encapsulation substrate, which is arranged on the array substrate to cover the organic light-emitting device layer. The encapsulation substrate may protect the TFT and the organic light-emitting device layer from external impact and may prevent water or oxygen from penetrating into the organic light-emitting device layer. In addition, the layer provided on the array substrate may include an inorganic light-emitting layer (for example, a nano-sized material layer, quantum dots, etc.). As another example, the layer provided on the array substrate may include a micro light-emitting diode.

[0099] The display panel may further include a backing such as a metal plate attached to the display panel. However, the embodiment is not limited to the metal plate, and the display panel may include another structure.

[0100] In the present disclosure, a display panel can be applied to a vehicle as a user interface module, such as a central control panel in a car. For example, the display panel can be positioned between two front-seat passengers so that vibrations from the display panel are transmitted to the interior of the vehicle. This improves the audio experience in the vehicle compared to a case where speakers are positioned on the interior of the vehicle.

[0101] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0102] The present inventors have recognized that when a sound generating device is configured with only a single vibration generating device, the sound pressure level in the high-frequency and low-frequency domains is reduced. Therefore, the present inventors conducted various experiments to achieve a sound generating device in which the sound pressure level in the high-frequency and low-frequency domains is not reduced. Consequently, through various experiments, the present inventors have invented a display device including a sound generating device having a novel structure for improving the sound pressure level in the high-frequency and low-frequency domains.

[0103] Figure 1 is a perspective view illustrating a display device according to an embodiment of the present disclosure. Figure 2 It is along Figure 1 A cross-sectional view taken along line II' is shown. Figure 3 yes Figure 1 Rear view of the display panel shown.

[0104] Reference Figures 1 to 3 , the display apparatus 10 according to an embodiment of the present disclosure may include a display module 100 , a supporting member 300 , and a sound generating device 400 .

[0105] The display module 100 may include a display panel 110. The display panel 110 may display an image (e.g., 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 generating device 400 to output sound in a forward direction relative to the display panel 110. The sound generating device 400 may use the display panel 110 as a vibration plate to generate sound. The sound generating device 400 may be referred to as an "actuator," "stimulator," or "transducer," but is not limited thereto. For example, the sound generating device 400 may be a sound device for outputting sound based on an electrical signal.

[0106] 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 an encapsulation layer encapsulating the pixel array layer.

[0107] For example, based on the structure of the pixel array layer including an anode electrode, a cathode electrode, and an organic compound layer, the display panel 110 can display images in a type such as a top emission type, a bottom emission type, or a dual emission type. In the top emission type, visible light emitted from the pixel array layer can be irradiated onto an area in front of the base substrate to allow an image to be displayed, and in the bottom emission type, visible light emitted from the pixel array layer can be irradiated onto a rearward area behind the base substrate to allow an image to be displayed. In the dual emission type, visible light emitted from the pixel array layer can be emitted to a front area and a rearward area relative to the base substrate.

[0108] The plurality of pixels may be respectively located in a plurality of pixel regions defined by a plurality of pixel drive lines. Furthermore, 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. For example, the light-emitting device may include an organic light-emitting layer or a quantum dot light-emitting layer. As another example, the light-emitting device may include a micro light-emitting diode (LED), but is not limited thereto.

[0109] The encapsulation layer protects the TFT and light-emitting devices from external impact and prevents water or moisture from entering the light-emitting devices. The encapsulation layer can be replaced by an encapsulation substrate attached to the pixel array substrate via a filler surrounding the pixel array. If the filler is transparent, the encapsulation substrate can be a transparent encapsulation substrate.

[0110] 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, which is provided on the display panel 110 and includes touch electrodes for sensing a user touch applied to the display module 100. The touch electrode layer may sense a change in capacitance of the touch electrodes caused by the user's touch. For example, a mutual capacitance type in which a plurality of touch drive electrodes and a plurality of touch sensing electrodes are arranged to intersect with each other or a self-capacitance type in which only a plurality of touch sensing electrodes are arranged may be applied, and an adhesive layer may be provided on the upper surface or the lower surface and may be attached to and fixed to the upper element or the lower element.

[0111] The display module 100 may further include a polarizing film 150 on the touch panel 130. The polarizing film 150 may be attached to the upper surface of the touch panel 130 via a film attachment member. The polarizing film 150 may circularly polarize external light reflected by the TFTs and / or pixel drive lines on the pixel array substrate, thereby enhancing the visibility and contrast of the display panel 110. The polarizing film 150 may be located between the encapsulation layer of the display panel 110 and the touch panel 130.

[0112] The display panel 110 may further include a barrier layer between the encapsulation layer of the display panel 110 and the touch panel 130. The barrier layer may prevent water, moisture, or the like from penetrating into the pixel array.

[0113] The display module 100 may further include a color filter layer on the upper surface of the encapsulation layer of the display panel 110. The color filter layer may include a color filter disposed to overlap each of the plurality of pixels and transmitting only a wavelength of a color set in each of the plurality of pixels.

[0114] The support member 300 can accommodate the display module 100. In this specification, the support member 300 may be referred to as a "cover bottom," "board bottom," "back cover," "base frame," "metal frame," "metal chassis," "chassis seat," or "four-wheel drive chassis." Therefore, the support member 300 may be a support member for supporting the display panel 110 and may be implemented as any type of frame or plate structure, each of which is provided on the rear surface of the display device.

[0115] For example, the support member 300 may include a support member rear portion 310 and a support member side portion 330. The support member rear portion 310 may be on the rear surface of the display module 100 and may cover the rear surface of the display module 100. For example, the support member rear portion 310 may cover the circuit accommodating space in the rear surface of the display module 100. For example, the support member rear 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 cover window 700. For example, the support member rear portion 310 may be a rear cover, but the term is not limited thereto. For example, the support member rear portion 310 may be provided independently of the support member side portion 330.

[0116] The support member side portions 330 may surround the respective side surfaces of the display module 100 to provide a display receiving space for receiving the display module 100. The support member side portions 330 may be provided in a frame shape or a rounded shape, but are not limited thereto. For example, the respective side surfaces of the support member 300 may be rounded to have a curvature radius to enhance the design aesthetics of the display device.

[0117] The support member side portion 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 a receiving space for receiving the display module 100. For example, the first to fourth side surfaces 331 to 334 of the support member 300 may provide a circuit receiving space for receiving peripheral circuits of an electronic device (including a battery, a circuit configuration of a driving circuit unit, etc.).

[0118] 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 support member rear portion 310. The first side surface 331 of the support member 300 may surround the first side surface or one width side of the display module 100.

[0119] 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 disposed perpendicular to the second side surface or the second long side of the support member rear portion 310. The second side surface 332 of the support member 300 may surround the second side surface or the other width side of the display module 100.

[0120] The third side surface 333 of the support member 300 may be arranged parallel to the second longitudinal direction Y of the display device that intersects the first longitudinal direction X of the display device. For example, the third side surface 333 of the support member 300 may be arranged perpendicular to the third side surface or the first short side of the support member rear portion 310. The third side surface 333 of the support member 300 may surround the third side surface or one longitudinal side of the display module 100.

[0121] 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 disposed perpendicular to the fourth side surface or the second short side of the support member rear portion 310. The fourth side surface 334 of the support member 300 may surround the fourth side surface or another length side of the display module 100.

[0122] The sound generating device 400 may be provided on the rear surface of the display module 100 (e.g., the rear surface of the display panel 110) and may vibrate the display module 100 based on the vibration driving signal. Thus, the sound generating device 400 may output sound in the forward direction Z relative to the display panel 110 based on the vibration of the display panel 110.

[0123] The support member 300 according to an embodiment of the present disclosure may further include a vibration device exposure portion on 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 generating device 400. Thus, the sound generating device 400 attached to the rear surface of the display module 100 can be exposed to the outside through the vibration device exposure portion. Furthermore, a portion of the lower portion of the sound generating device 400 can be inserted into or accommodated in the vibration device exposure portion. The vibration device exposure portion can ensure a vibration space for the sound generating device 400 disposed in the display module 100, thereby making the display device thinner and allowing the sound generating device 400 to be easily placed. The vibration device exposure portion may be omitted when the distance between the support member rear portion 310 and the rear surface of the display module 100 is greater than the vibration space.

[0124] The sound generating device 400 can be provided on or attached to the rear surface of the display panel 110 using an adhesive member 403. The adhesive member 403 may include, but is not limited to, double-sided tape, a heat-curing adhesive, a light-curing adhesive, or a natural curing adhesive. For example, the double-sided tape may include, but is not limited to, an acrylic-based adhesive in a non-woven fabric. For example, the heat-curing adhesive may include, but is not limited to, an epoxy resin. The adhesive member 403 may be provided on the entire surface of the sound generating device 400, but is not limited to this. The adhesive member 403 may include, but is not limited to, an adhesive member or an adhesive.

[0125] Reference Figures 1 to 3 The sound generating device 400 may include a first vibration generating device 401 and a second vibration generating device 402 to improve the sound pressure levels in the low-frequency domain and the high-frequency domain in a sound generating device equipped with a single vibration generating device. The first vibration generating device 401 may be disposed near the second vibration generating device 402. For example, the first vibration generating device 401 may be surrounded by the second vibration generating device 402, which is spaced apart from the first vibration generating device 401. The second vibration generating device 402 may be formed into a closed loop, wherein the second vibration generating device 402 is disposed along the exterior of the first vibration generating device 401. Therefore, the first vibration generating device 401 may be disposed in an inner area surrounded by the second vibration generating device 402, or may be disposed inside the second vibration generating device 402. The first vibration generating device 401 may be disposed adjacent to the second vibration generating device 402. For example, the second vibration generating device 402 may be spaced apart from the first vibration generating device 401 by a specific interval or distance. When the second vibration generating device 402 is disposed too close to the first vibration generating device 401 , vibration characteristics may be offset by interference between the vibration of the first vibration generating device 401 and the vibration of the second vibration generating device 402 , and thus, the first vibration generating device 401 may be spaced apart from the second vibration generating device 402 .

[0126] The displacement of the central region of the first vibration generating device 401 can be maximized by a signal applied to the sound generating device 400, thereby enhancing or improving the sound pressure level of low-pitched vocal cords. For example, the first vibration generating device 401 can maximize the displacement of the central region of the sound generating device 400 based on the signal applied to the sound generating device 400, thereby enhancing or improving the sound pressure level of low-pitched vocal cords. The second vibration generating device 402 can maximize the vibration of the edge or peripheral portion of the display panel 110, thereby enhancing or improving the sound pressure level of high-pitched vocal cords. Therefore, the sound generating device 400 can be configured to output sound in the audible frequency domain, with the first vibration generating device 401 being configured to enhance the sound of low-pitched vocal cords, and the second vibration generating device 402 being configured to enhance the sound of high-pitched vocal cords. For example, the audible frequency range can be 20 Hz to 20 kHz, but is not limited thereto. For example, the mid-pitched vocal cords can be 200 Hz to 3 kHz, the high-pitched vocal cords can be 3 kHz or higher, and the low-pitched vocal cords can be 200 Hz or lower. However, embodiments are not limited to this.

[0127] The first vibration generating device 401 and the second vibration generating device 402 may have a shape such as a rectangular (eg, quadrilateral) shape, a square shape, a diamond shape, or a parallelogram shape, but the shapes are not limited thereto.

[0128] A protective member may also be provided to protect the vibration-generating device of the sound-generating device 400. The protective member may be larger than or equal to the size of the sound-generating device as the vibration-generating device and may be attached to the rear surface of the sound-generating device 400. The protective member can prevent damage to the sound-generating device 400 due to physical impact and / or electrical shock, such as static electricity. For example, the sound-generating device 400 may be damaged by static electricity generated in the display module 100, such as the panel driver circuit unit, or flowing in from the outside, or by physical contact with the rear portion 310 of the support member caused by pressure from the display module 100. Therefore, since the protective member is on the rear surface of the sound-generating device 400, it can cut off static electricity transmitted to the sound-generating device 400 through the display module 100, thereby protecting the sound-generating device 400 from static electricity, and can also protect the sound-generating device 400 from physical impacts applied to the sound-generating device 400 by the display module 100. The protective member may include single-sided insulating tape or insulating single-sided foam tape, each of which includes an adhesive layer that is attached to the sound-generating device 400. For example, the protection member may be a polyethylene terephthalate (PET) insulation tape or a polyvinyl chloride (PVC) insulation tape, but is not limited thereto.

[0129] The first vibration generating device 401 and the second vibration generating device 402 may include a piezoelectric material layer having a piezoelectric effect and electrodes disposed at the edge or periphery of the piezoelectric material layer. As another example, the electrodes may include an opaque metal material having relatively low resistance and good heat dissipation properties, but embodiments are not limited thereto. In other embodiments, the electrodes may include a transparent conductive material or a conductive polymer material. Each of the first vibration generating device 401 and the second vibration generating device 402 may include a piezoelectric material layer and, therefore, may be referred to as a "piezoelectric device."

[0130] The piezoelectric material layer may include a piezoelectric material that vibrates using an electric field. Here, the piezoelectric material may have such characteristics 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 dielectric polarization due to a change in the relative positions of positive (+) ions and negative (-) ions, and the piezoelectric material vibrates due to the electric field based on the applied voltage.

[0131] Each of the first vibration generating device 401 and the second vibration generating device 402 may include a polymer material piezoelectric material, a thin film material piezoelectric material, a composite material piezoelectric material, or a piezoelectric material containing a single crystal ceramic or a polycrystalline ceramic. Examples of piezoelectric materials containing polymer materials may include polyvinylidene fluoride (PVDF), polyvinylidene fluoride trifluoroethylene P(VDF-TrFe), and P(VDFTeFE). Examples of piezoelectric materials containing thin film materials may include ZnO, CdS, and AlN. Examples of piezoelectric materials containing composite materials may include PZT-PVDF, PZT-silicone rubber, PZT-epoxy resin, PZT-foam polymer, and PZT-foam polyurethane. Examples of piezoelectric materials containing single crystal ceramics may include α-AlPO4, α-SiO2, LiNbO3, Tb2(MoO4)3, Li2B4O7, and ZnO. Examples of piezoelectric materials containing polycrystalline ceramics may include PZT-based materials, PT-based materials, PZT-complex perovskite-based materials, and BaTiO3.

[0132] The display device according to an embodiment of the present disclosure may further include a driving circuit unit 600 and a cover window 700 .

[0133] The driving circuit unit 600 may be located in the circuit accommodating space in the support member 300 and may be connected to the display panel 110 and the sound generating device 400. The driving circuit unit 600 may include a panel driving circuit and a sound processing circuit.

[0134] A 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 a pixel array substrate of the display panel 110 and supply driving signals and data signals to pixel driving lines, thereby displaying an image on each pixel.

[0135] The sound processing circuit may generate an audio signal based on the audio source and amplify the audio signal to generate a vibration driving signal. The first vibration generating device 401 and the second vibration generating device 402 of the sound generating device 400 may vibrate according to the generated vibration driving signal.

[0136] The cover window 700 may be coupled or connected to the support member 300 to support the display module 100. The cover window 700 may be formed of glass or a reinforced glass material. For example, the cover window 700 may include sapphire glass or Gorilla Glass, or a bonding structure thereof. The cover window 700 may be attached to the front surface of the display module 100 via an adhesive member. The adhesive member may be, but is not limited to, an optically clear adhesive (OCA), an optically clear resin (OCR), or a pressure-sensitive adhesive (PSA).

[0137] The cover window 700 may cover the non-display area of the display module 100 except for the display area. For example, the cover window 700 may 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 may be a support member, a window cover, etc., and the embodiments are not limited to these terms.

[0138] Reference Figure 3 , the sound generating device 400 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 width direction of the display panel 110, and the long side may be in the length direction of the display panel 110. The width direction and the length direction may be interchangeable. For example, the distance d1 between the center of the first vibration generating device 401 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 device 400 is on the upper side of the rear surface of the display panel 110, the sound pressure level can be further improved compared to when the sound generating device 400 is set in the center of the display panel 110.

[0139] Figures 4A to 4F is a diagram for describing vibration of the sound generating device according to an embodiment of the present disclosure.

[0140] Reference Figures 4A to 4F, the two sound processing circuits included in the driving circuit unit 600 can respectively apply vibration drive signals to the first vibration generating device 401 and the second vibration generating device 402 of the sound generating device 400. An example in which each of the first vibration generating device 401 and the second vibration generating device 402 is formed by stacking two layers will be described, but the embodiment is not limited thereto. In other embodiments, each of the first vibration generating device 401 and the second vibration generating device 402 is formed by stacking two or more layers. For example, each of the first vibration generating device 401 and the second vibration generating device 402 is formed by stacking four, eight, sixteen, or eighteen layers, and the number of layers is not limited thereto.

[0141] Reference Figure 4A When a vibration drive signal is applied to each of the first vibration generating device 401 and the second vibration generating device 402 of the sound generating device 400, the first vibration generating device 401 and the second vibration generating device 402 may vibrate or be excited in opposite phases. For example, the first vibration generating device 401 may vibrate in an upward direction relative to the display panel 110 under tension (indicated by A), and the second vibration generating device 402 may vibrate in a downward direction relative to the display panel 110 under compression (indicated by B). As another example, the first vibration generating device 401 may be compressed in a downward direction relative to the display panel 110 (indicated by B), and the second vibration generating device 402 may be stretched in an upward direction relative to the display panel 110 (indicated by "A"). This will be described below.

[0142] Reference Figure 4B and Figure 4C , shows an example in which the sound processing circuit of the driving circuit unit 600 applies a signal having a first phase W1 to the first vibration generating device 401. In a1 of the signal having the first phase W1, tension T may occur in the first vibration generating device 401, and vibration may occur in the upward direction relative to the display panel 110 (indicated by "A"). In a2 of the signal having the first phase W1, compression C may occur in the first vibration generating device 401, and vibration may occur in the downward direction relative to the display panel 110 (indicated by "B"). Therefore, tension and compression may be repeatedly performed in the first vibration generating device 401, and vibration may occur in the vertical direction.

[0143] Reference Figure 4D and Figure 4E, shows an example in which a signal having a second phase W2 different from the first phase W1 is applied to the second vibration generating device 402 by the sound processing circuit of the driving circuit unit 600. In b1 of the signal having the second phase W2, compression C may occur in the second vibration generating device 402, and vibration may occur in the downward direction relative to the display panel 110 (shown by "B"). In b2 of the signal having the second phase W2, stretching T may occur, and vibration may occur in the upward direction relative to the display panel 110 (shown by "A"). Therefore, stretching and compression may be repeatedly performed in the second vibration generating device 402, and thus, vibration may occur. The second vibration generating device 402 may be vibrated or excited in a phase different from that of the first vibration generating device 401. For example, the first vibration generating device 401 may be stretched by T, and thus may vibrate in the A direction, and the second vibration generating device 402 may be compressed by C, and thus may vibrate in the B direction. The second phase W2 may be different from the first phase W1. For example, the second phase W2 may be in phase. Applied to Figure 4B and Figure 4C The signal can be an in-phase signal and applied to Figure 4D and Figure 4E The signal may be an anti-phase signal, but the present disclosure is not limited thereto. For example, an out-of-phase signal may be applied to the first sound generating device 401, and an in-phase signal may be applied to the second sound generating device 402. Thus, compression and extension may be repeatedly performed in the first vibration generating device 401, thereby generating vibration in the vertical direction, and extension and compression may be repeatedly performed in the second vibration generating device 402, thereby generating vibration in the vertical direction.

[0144] Reference Figure 4FThe dashed line represents the displacement of each of the first vibration generating device 401 and the second vibration generating device 402 when no signal is applied, and the solid line represents the displacement of each of the first vibration generating device 401 and the second vibration generating device 402 after a signal is applied to the first vibration generating device 401 and the second vibration generating device 402. The signal applied to the first vibration generating device 401 is W1, and the signal applied to the second vibration generating device 402 is W2. W1 and W2 can be signals with different phases. When the signals W1 and W2 with different phases are applied to the first vibration generating device 401 and the second vibration generating device 402, the first vibration generating device 401 and the second vibration generating device 402 can vibrate repeatedly in the A direction and the B direction. For example, the first vibration generating device 401 and the second vibration generating device 402 can vibrate in the A direction and the B direction, repeatedly stretching and compressing, based on the signal applied to the sound generating device. Therefore, compared to the dashed line, the displacement of the central area of the first vibration generating device 401 can vary by V1 and V2, and thus can be maximized. The displacement of the first vibration generating device 401 can be maximized by the vibration of the second vibration generating device 402 in the opposite direction to the vibration of the first vibration generating device 401, thereby further reinforcing or enhancing the sound of the low-pitched vocal range. Therefore, the sound of the low-pitched vocal range of the sound generating device 400 can be further enhanced. The second vibration generating device 402 can vibrate the edge or periphery of the display panel 110, thereby reinforcing or enhancing the sound of the high-pitched vocal range.

[0145] Therefore, since signals with different phases are applied to the first vibration generating device 401 and the second vibration generating device 402, the first vibration generating device 401 and the second vibration generating device 402 can vibrate or be excited in opposite directions. For example, the first vibration generating device 401 can use the signal applied to the sound generating device 400 to vibrate the central area of the sound generating device 400. For example, by maximizing the displacement of the central area of the first vibration generating device 401, the sound of low-pitched vocal cords can be strengthened or improved. For example, the second vibration generating device 402 can maximize the vibration of the edge or periphery of the display panel 110 to strengthen or improve the sound of high-pitched vocal cords. Therefore, in the sound generating device according to an embodiment of the present disclosure, the sound of both low-pitched vocal cords and high-pitched vocal cords can be improved or enhanced.

[0146] Refer to above Figures 1 to 3The described sound generating device can be applied to a receiver such as an electronic device. The receiver can transmit the call voice based on the electronic device to the user's ears. For example, when the sound generating device is applied to a receiver such as an electronic device, the sound of the low-pitched vocal range and the sound of the high-pitched vocal range can be improved or enhanced through the first vibration generating device 401 and the second vibration generating device 402 and transmitted to the user, thereby providing a display device that provides the user with enhanced call voice.

[0147] Figure 5 A display device 20 according to another embodiment of the present disclosure is shown. Figure 6 It is along Figure 5 A cross-sectional view taken along line II-II'. Figure 7 yes Figure 5 Rear view of the display panel shown.

[0148] Reference Figures 5 to 7 The display device 20 according to another embodiment of the present disclosure may include a display module 100, a support member 300, a first sound generating device 400, and a second sound generating device 500. 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. Figures 1 to 3 described, therefore, descriptions thereof are omitted or will be briefly given below.

[0149] Reference Figures 5 to 7 , the display device 20 according to an embodiment of the present disclosure may include a first sound generating device 400 and a second sound generating device 500. Figures 1 to 3 The sound generating device may be Figures 5 to 7 The first sound generating device shown above Figures 1 to 3 The bonding member may be Figures 5 to 7 The second sound generating device 500 may include a third vibration generating device 501 and a fourth vibration generating device 502. The third vibration generating device 501 may be disposed adjacent to the fourth vibration generating device 502. For example, the fourth vibration generating device 502 may be formed into a closed loop, wherein the fourth vibration generating device 502 is disposed along the exterior of the third vibration generating device 501. Thus, the third vibration generating device 501 may be disposed in an inner area surrounded by the fourth vibration generating device 502, or may be disposed inside the fourth vibration generating device 502. The third vibration generating device 501 may be disposed adjacent to the fourth vibration generating device 502. For example, the fourth vibration generating device 502 may be spaced apart from the third vibration generating device 501 by a specific interval or distance.

[0150] Therefore, since signals with different phases are applied to the third vibration generating device 501 and the fourth vibration generating device 502, the third vibration generating device 501 and the fourth vibration generating device 502 can vibrate or be excited in opposite directions. For example, the third vibration generating device 501 can use the signal applied to the second sound generating device 500 to vibrate the central area of the second sound generating device 500. For example, by maximizing the displacement of the central area of the third vibration generating device 501, the sound of the low-pitched vocal range can be strengthened or improved. For example, the fourth vibration generating device 502 can maximize the vibration of the edge or periphery of the display panel 110 to strengthen or improve the sound of the high-pitched vocal range. Therefore, the second sound generating device 500 can be configured to output sound in the audible frequency domain, the third vibration generating device 501 can be configured to strengthen the sound of the low-pitched vocal range, and the fourth vibration generating device 502 can be configured to strengthen the sound of the high-pitched vocal range. Therefore, in the sound generating device according to the embodiment of the present disclosure, the sound of the low-pitched vocal range and the sound of the high-pitched vocal range can be improved or enhanced. The third vibration generating device 501 and the fourth vibration generating device 502 are similar to those described above with reference to FIG. Figures 1 to 3 The described first vibration generating means 401 and second vibration generating means 402 are the same, and therefore, description thereof is omitted.

[0151] The second sound generating device 500 may be disposed on or coupled to the rear surface of the display panel 110 using a second adhesive member 503. The second adhesive member 503 may include, but is not limited to, double-sided tape, a heat-curing adhesive, a light-curing adhesive, or a natural curing adhesive. For example, the double-sided tape may include, but is not limited to, an acrylic-based adhesive in a non-woven fabric. For example, the heat-curing adhesive may include, but is not limited to, an epoxy resin. The second adhesive member 503 may be on the entire surface of the second sound generating device 500, but is not limited to this. The second adhesive member 503 may include, but is not limited to, an adhesive member or an adhesive.

[0152] Reference Figure 7, the first sound generating device 400 may be located at 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 and second short sides may be in the width direction of the display panel 110, and the long side may be in the length direction of the display panel 110. The width direction and the length direction may be interchangeable. For example, the distance d1 between the center of the first vibration generating device 401 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 generating device 400 is located at the upper portion of the rear surface of the display panel 110, the sound pressure level can be further improved compared to when the first sound generating device 400 is located in the center of the display panel 110. The second sound generating module 500 may be located at the lower side of the rear surface of the display panel 110. For example, the distance d2 between the center of the third vibration device 501 and the second short side of the display panel 110 may be 1 / 4 to 1 / 3 of the distance relative to 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 generating device 500 may be arranged symmetrically with respect to the center of the display module 100 and the first sound generating device 400.

[0153] Figure 8 is a rear view of a display device 30 according to another embodiment of the present disclosure.

[0154] Reference Figure 8 , a display device 30 according to another embodiment of the present disclosure may include a first sound generating device 400 and a second sound generating device 500. The first sound generating device 400 may vibrate a first rear area A1 of the display module 100 based on a vibration driving signal provided from the driving circuit unit 600. The first rear area A1 may be a right rear area or an area between a rear center portion or center portion CL1 of the display module 100 and one short side of the display module 100 relative to a length direction or a long side direction X of the display module 100. For example, the first rear area A1 may be a right or left peripheral area or a peripheral area of the display module 100 relative to the length direction or the long side direction X of the display module 100.

[0155] The first sound generating device 400 can be disposed on or coupled to the rear surface of the display panel 110 using a first adhesive member 403. The first adhesive member 403 may include, but is not limited to, double-sided tape, a heat-curing adhesive, a light-curing adhesive, or a natural-curing adhesive. For example, the double-sided tape may include, but is not limited to, an acrylic-based adhesive in a non-woven fabric. For example, the heat-curing adhesive may include, but is not limited to, an epoxy resin. The first adhesive member 403 may be disposed over the entire surface of the first sound generating device 400, but is not limited to this.

[0156] The second sound generating device 500 can vibrate the second rear area A2 of the display module 100 based on the vibration driving signal provided by the driving circuit unit 600. The second rear area A2 may be a left rear area or an area between the center portion CL1 of the display module 100 and another short side of the display module 100 relative to the length direction or long side direction X of the display module 100. For example, the second rear area A2 may be a left or right peripheral area or another peripheral area of the display module 100 relative to the length direction or long side direction X of the display module 100. The second sound generating device 500 may be arranged symmetrically with the first sound generating device 400. For example, the second sound generating device 500 may be arranged symmetrically with the first sound generating device 400 relative to the center portion CL1 of the display module 100.

[0157] The second sound generating device 500 may be provided on or coupled to the rear surface of the display panel 110 using a second adhesive member 503. The second adhesive member 503 may include double-sided tape, a heat-curing adhesive, a light-curing adhesive, or a natural-curing adhesive, but embodiments are not limited thereto. For example, the double-sided tape may include an acrylic-based adhesive in a non-woven fabric, but embodiments are not limited thereto. For example, the heat-curing adhesive may include an epoxy resin, but embodiments are not limited thereto. The second adhesive member 503 may be provided over the entire surface of the second sound generating device 500, but embodiments are not limited thereto.

[0158] The display device 30 according to an embodiment of the present disclosure may further include a partition 900. The partition 900 may be provided in the rear center portion CL1 of the display module 100. For example, the partition 900 may be located between the first sound generating device 400 and the second sound generating device 500. For example, the partition 900 may spatially separate or divide the first rear area A1 overlapping with the first sound generating device 400 and the second rear area A2 overlapping with the second sound generating device 500 at the rear surface of the display panel 110, thereby preventing interference between the sounds generated by the first rear area A1 and the second rear area A2. The partition 900 may spatially separate or divide the first rear area A1 and the second rear area A2 in the rear surface of the display module 100 (or display panel 110) to prevent interference between the sounds generated by the first rear area A1 and the second rear area A2. Therefore, the partition 900 can separate the sounds generated by the first vibration generating device 400 and the second vibration generating device 500 to prevent interference between the generated sounds, thereby allowing 2.0 channel sound to be output to a forward area relative to the display module 100 based on the vibration of the display module 100.

[0159] The partition 900 may be located between the rear surface of the display module 100 and the rear support member portion 310 of the support member 300. The rear surface of the partition 900 may be attached to the rear support member portion 310 of the support member 300, and the front surface of the partition 900 may be attached to the rear surface of the display module 100. The partition 900 may be configured in a non-contact manner relative to the rear surface of the display module 100. For example, the partition 900 may be formed of double-sided tape, double-sided foam pad, single-sided tape, single-sided foam pad, adhesive, or bonding agent, but embodiments are not limited thereto. The partition 900 may be referred to as a "housing" or "baffle," but the terms are not limited thereto.

[0160] Refer to above Figures 5 to 8 The described sound generating device can be applied to a speaker or receiver, such as an electronic device. The receiver can transmit call audio based on the electronic device to the user's ear. For example, when the first sound generating device 400 operates as a receiver, such as an electronic device, the first sound generating device 400 can receive a vibration drive signal from a sound processing circuit. For example, when the first sound generating device 400 is applied to a receiver, such as an electronic device, the first sound generating device 400 can transmit the sound of the low-pitched vocal range and the sound of the high-pitched vocal range, which are improved by the first vibration generating device 401 and the second vibration generating device 402, to the user, or the user can receive the sound of the improved low-pitched vocal range and the sound of the improved high-pitched vocal range, thereby providing a display device that provides the user with enhanced call audio. For example, when each of the first sound generating device 400 and the second sound generating device 500 operates as a speaker, such as an electronic device, each of the first sound generating device 400 and the second sound generating device 500 can receive a vibration drive signal from the sound processing circuit. As a result, the sound of the low-pitched vocal range and the sound of the high-pitched vocal range, which are improved by the first vibration generating device 401 and the second vibration generating device 402, can be transmitted to the user.

[0161] Figure 9 Sound output characteristics of a display device according to an embodiment of the present disclosure are shown.

[0162] exist Figure 9 In FIG. 1 , the dotted line shows the sound output characteristics of the sound generating device equipped with one vibration generating device, and the solid line shows the sound output characteristics of the sound generating device according to the embodiment of the present disclosure. Figure 2 The horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure level (SPL) (dB).

[0163] Sound output characteristics can be measured using a sound analysis device. The sound analysis device may include a sound card that transmits and receives sound to and from a controlling personal computer (PC); an amplifier that amplifies the signal generated by the sound card and transmits the amplified signal to a sound generating device; and a microphone that collects sound generated by the sound generating device in the display panel. The sound collected by the microphone can be input to the controlling PC via the sound card, and a control program can examine the input sound to analyze the sound of the sound generating device.

[0164] The vibration generating device of the sound generating device configured with a vibration generating device and the sound generating device according to the embodiment of the present disclosure is formed of PZT, and the bonding member is formed of a double-sided tape. The first vibration generating device and the second vibration generating device according to the embodiment of the present disclosure are arranged apart from each other. The sound output characteristics were measured in an anechoic chamber that was closed in all directions, and the measurement equipment used was APX525 from Audio Precision. The measurement was performed under the conditions of a driving voltage of 30 Vpp and a sound pressure level measurement distance of about 1 cm to the display panel. The applied frequency signal was applied as a sine sweep in the range of 20 Hz to 20 kHz, and 1 / 3 octave smoothing was performed on the measurement results. The measurement method is not limited to this.

[0165] Reference Figure 9 Compared to a sound generating device equipped with a single vibration generating device, it can be seen that the sound generating device according to an embodiment of the present disclosure provides an enhanced sound pressure level at 200 Hz or lower, corresponding to the low-pitched vocal range. For example, compared to a sound generating device equipped with a single vibration generating device, it can be seen that the sound generating device according to an embodiment of the present disclosure provides an enhanced sound pressure level of 4 dB or more relative to a frequency of approximately 200 Hz. Compared to a sound generating device equipped with a single vibration generating device, it can be seen that the sound generating device according to an embodiment of the present disclosure provides an enhanced sound pressure level at 3 kHz or higher, corresponding to the high-pitched vocal range. For example, compared to a sound generating device equipped with a single vibration generating device, it can be seen that the sound generating device according to an embodiment of the present disclosure does not experience a decrease in the low-pitched sound pressure level at a frequency of approximately 5 kHz. For example, compared to a sound generating device equipped with a single vibration generating device, it can be seen that the sound generating device according to an embodiment of the present disclosure provides an enhanced sound pressure level of 20 dB or more relative to a frequency of approximately 5 kHz.

[0166] Therefore, according to the embodiments of the present disclosure, a display device that enhances the sound pressure levels in low and high frequencies can be realized.

[0167] The sound generating device according to the embodiment of the present disclosure can be applied as a sound generating device in a display device. The display device according to the embodiment of the present disclosure can be applied to a mobile device, a video phone, a smart watch, a watch phone, a wearable device, a foldable device, a rollable device, a bendable device, a flexible device, a curved device, a portable multimedia player (PMP), a personal digital assistant (PDA), an electronic notepad, a desktop personal computer (PC), a laptop PC, a notebook 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 household appliance, etc. In addition, the sound generating device according to the embodiment of the present disclosure can be applied to an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the sound generating device is applied to a lighting device, the sound generating device can act as a lighting and a speaker. The sound generating device according to the embodiment of the present disclosure can be applied to a receiver and / or a speaker such as an electronic device.

[0168] A display device according to an embodiment of the present disclosure will be described below.

[0169] According to an embodiment of the present disclosure, a display device includes: a display module, which includes a display panel configured to display an image; and a first sound generating device on a rear surface of the display panel, wherein the first sound generating device includes a first vibration generating device and a second vibration generating device adjacent to the first vibration generating device, and the first vibration generating device is configured to vibrate a central area of the first sound generating device based on a signal applied to the first sound generating device, and the second vibration generating device is configured to vibrate a periphery of the display panel based on the applied signal.

[0170] For example, in the display apparatus according to the embodiment of the present disclosure, the first vibration generating device may be surrounded by the second vibration generating device spaced apart from the first vibration generating device.

[0171] For example, in the display apparatus according to an embodiment of the present disclosure, the phase of the signal applied to the first vibration generating device may be opposite to the phase of the signal applied to the second vibration generating device.

[0172] For example, in the display apparatus according to an embodiment of the present disclosure, the first vibration generating device may be configured to improve the sound of a low-pitched vocal range, and the second vibration generating device may be configured to improve the sound of a high-pitched vocal range.

[0173] For example, in the display apparatus according to the embodiment of the present disclosure, each of the first vibration generating device and the second vibration generating device may include a piezoelectric material layer.

[0174] 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 first vibration generating device and the first short side of the display panel may be 1 / 4 to 1 / 3 relative to the long side of the display panel.

[0175] For example, a display device according to an embodiment of the present disclosure may also include a second sound generating device separated from the first sound generating device in the rear surface of the display panel, the second sound generating device including a fourth vibration generating device and a third vibration generating device separated from and surrounded by the fourth vibration generating device.

[0176] For example, in the display apparatus according to an embodiment of the present disclosure, the phase of the signal applied to the third vibration generating device may be opposite to the phase of the signal applied to the fourth vibration generating device.

[0177] 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 third vibration generating device and the second short side of the display panel may be 1 / 4 to 1 / 3 relative to the long side of the display panel.

[0178] For example, in the display apparatus according to an embodiment of the present disclosure, the first sound generating device may be disposed symmetrically to the second sound generating device with respect to a central portion of the display module.

[0179] For example, a spacer in the rear center portion of the display module may be further included in the display apparatus according to an embodiment of the present disclosure.

[0180] For example, in a display device according to an embodiment of the present disclosure, the display module may include a first rear area overlapping the first sound generating device and a second rear area overlapping the second sound generating device, and a partition may be provided between the first rear area and the second rear area.

[0181] For example, the display apparatus according to an embodiment of the present disclosure may further include a supporting member configured to accommodate the display module, the supporting member including a vibration device exposure portion protruding from the supporting member, wherein the first sound generating device is accommodated in the vibration device exposure portion.

[0182] According to an embodiment of the present disclosure, a display device includes: a display module, which includes a display panel configured to display an image; and a first sound generating device on a rear surface of the display panel, wherein the first sound generating device includes a first vibration generating device and a second vibration generating device, and the second vibration generating device is configured to vibrate at a phase different from that of the first vibration generating device.

[0183] For example, in the display device according to the embodiment of the present disclosure, one of the first vibration generating device and the second vibration generating device may be configured to vibrate in opposite phases.

[0184] For example, in the display apparatus according to the embodiment of the present disclosure, the first vibration generating device may be surrounded by the second vibration generating device spaced apart from the first vibration generating device.

[0185] For example, in a display device according to an embodiment of the present disclosure, the first sound generating device may be configured to output sound in the audible frequency domain, the first vibration generating device may be configured to enhance the sound of the low-pitched vocal range, and the second vibration generating device may be configured to enhance the sound of the high-pitched vocal range.

[0186] 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 first vibration generating device and the first short side of the display panel may be 1 / 4 to 1 / 3 relative to the long side of the display panel.

[0187] For example, a display device according to an embodiment of the present disclosure may also include a second sound generating device separated from the first sound generating device in the rear surface of the display panel, the second sound generating device including a fourth vibration generating device and a third vibration generating device separated from the fourth vibration generating device and surrounded by the fourth vibration generating device.

[0188] For example, in a display device according to an embodiment of the present disclosure, the second sound generating device may be configured to output sound in the audible frequency domain, the third vibration generating device may be configured to enhance the sound of the low-pitched vocal range, and the fourth vibration generating device may be configured to enhance the sound of the high-pitched vocal range.

[0189] 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 third vibration generating device and the second short side of the display panel may be 1 / 4 to 1 / 3 relative to the long side of the display panel.

[0190] For example, in the display apparatus according to an embodiment of the present disclosure, the first sound generating device may be disposed symmetrically to the second sound generating device with respect to a central portion of the display module.

[0191] For example, the display apparatus according to an embodiment of the present disclosure may further include a spacer in a rear center portion of the display module.

[0192] For example, in a display device according to an embodiment of the present disclosure, the display module may include a first rear area overlapping the first sound generating device and a second rear area overlapping the second sound generating device, and a partition may be located between the first rear area and the second rear area.

[0193] For example, the display apparatus according to an embodiment of the present disclosure may further include a supporting member configured to accommodate the display module, the supporting member including a vibration device exposure portion protruding from the supporting member, wherein the first sound generating device is accommodated in the vibration device exposure portion.

[0194] As described above, the display device according to an embodiment of the present disclosure may include a sound generating device that vibrates the display panel to generate sound, thereby outputting the sound to a forward area in front of the display panel. Therefore, the immersive experience of viewers viewing images displayed by the display device can be enhanced.

[0195] Furthermore, according to an embodiment of the present disclosure, the sound generating device may include a first vibration generating device and a second vibration generating device, thereby providing a display apparatus that enhances sound pressure levels corresponding to low and high frequency regions.

[0196] It will be apparent to those skilled in the art that various modifications and variations may be made to the present disclosure without departing from the technical concept or scope of the present disclosure. Therefore, the embodiments of the present disclosure are intended to cover these modifications and variations of the present disclosure as long as they fall within the scope of the appended claims and their equivalents.

[0197] CROSS-REFERENCE TO RELATED APPLICATIONS

[0198] This application claims the benefit of and priority to Korean Patent Application No. 10-2018-0155198, filed on December 5, 2018, which is hereby incorporated by reference herein in its entirety.

Claims

1. A sound generating device, comprising: Vibration plate; as well as a first sound generating device, the first sound generating device being located on the rear surface of the vibration plate, Wherein, the first sound generating device includes: a first vibration generating device; and a second vibration generating device adjacent to and surrounding the first vibration generating device, wherein the first vibration generating device is configured to vibrate a central area of the first sound generating device based on a signal applied to the first sound generating device, and the second vibration generating device is configured to vibrate a periphery of the vibration plate based on the applied signal, wherein the first vibration generating device is configured to output a sound of a low-pitched vocal range, and Wherein, the second vibration generating device is configured to output the sound of the high-pitched vocal cords.

2. The sound generating device according to claim 1, wherein The first vibration generating device is spaced apart from the second vibration generating device.

3. The sound generating device according to claim 1, wherein The phase of the signal applied to the first vibration generating device is opposite to the phase of the signal applied to the second vibration generating device.

4. The sound generating device according to claim 1, wherein Each of the first vibration generating device and the second vibration generating device includes a piezoelectric material layer.

5. The sound generating device according to claim 1, wherein The vibration plate 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 A distance between a center of the first vibration generating device and the first short side of the vibration plate is 1 / 4 to 1 / 3 of the distance between the long side of the vibration plate.

6. The sound generating device according to claim 1 further comprises a second sound generating device separated from the first sound generating device in the rear surface of the vibration plate, the second sound generating device comprising a fourth vibration generating device and a third vibration generating device separated from the fourth vibration generating device and surrounded by the fourth vibration generating device.

7. The sound generating device according to claim 6, wherein The phase of the signal applied to the third vibration generating device is opposite to the phase of the signal applied to the fourth vibration generating device.

8. The sound generating device according to claim 6, wherein The vibration plate 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 A distance between a center of the third vibration generating device and the second short side of the vibration plate is 1 / 4 to 1 / 3 of the distance between the long side of the vibration plate.

9. The sound generating device according to claim 6, wherein The first sound generating device is provided symmetrically to the second sound generating device with respect to a central portion of the vibration plate. 10 . The sound generating device according to claim 6 , further comprising a partition in a rear center portion of the vibration plate.

11. The sound generating device according to claim 10, wherein The vibration plate includes a first rear area overlapping the first sound generating device and a second rear area overlapping the second sound generating device; and The partition is located between the first rear area and the second rear area.

12. The sound generating device according to claim 1, further comprising: a supporting member configured to accommodate the vibration plate, the supporting member including a vibration device exposed portion protruding from the supporting member, Wherein, the first sound generating device is accommodated in the vibration device exposed portion.

13. A sound generating device, comprising: Vibration plate; as well as a first sound generating device on the rear surface of the vibration plate, Wherein, the first sound generating device includes: a first vibration generating device; and a second vibration generating device configured to vibrate at a phase different from that of the first vibration generating device and surrounding the first vibration generating device, wherein the first vibration generating device is configured to output a sound of a low-pitched vocal range; and Wherein, the second vibration generating device is configured to output the sound of the high-pitched vocal cords.

14. The sound generating device according to claim 13, wherein One of the first vibration generating device and the second vibration generating device is configured to vibrate in anti-phase.

15. The sound generating device according to claim 13, wherein The first vibration generating device is spaced apart from the second vibration generating device.

16. The sound generating device according to claim 13, wherein The first sound generating device is configured to output sound in an audible frequency domain.

17. The sound generating device according to claim 13, wherein The vibration plate 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 A distance between a center of the first vibration generating device and the first short side of the vibration plate is 1 / 4 to 1 / 3 of the distance between the long side of the vibration plate.

18. The sound generating device according to claim 13, further comprising: A second sound generating device is spaced apart from the first sound generating device in the rear surface of the vibration plate, the second sound generating device including a fourth vibration generating device and a third vibration generating device spaced apart from and surrounded by the fourth vibration generating device.

19. The sound generating device according to claim 18, wherein The second sound generating device is configured to output sound in the audible frequency domain; The third vibration generating device is configured to enhance the sound of the low-pitched vocal range; and The fourth vibration generating device is configured to emphasize the sound of the high-pitched vocal cords.

20. The sound generating device according to claim 18, wherein The vibration plate 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 A distance between a center of the third vibration generating device and the second short side of the vibration plate is 1 / 4 to 1 / 3 of the distance between the long side of the vibration plate.

21. The sound generating device according to claim 18, wherein The first sound generating device is provided symmetrically to the second sound generating device with respect to a central portion of the vibration plate.

22. The sound generating device according to claim 18, further comprising a partition in a rear center portion of the vibration plate.

23. The sound generating device according to claim 22, wherein The vibration plate includes a first rear area overlapping the first sound generating device and a second rear area overlapping the second sound generating device; and The partition is located between the first rear area and the second rear area.

24. The sound generating device according to claim 13, further comprising: a supporting member configured to accommodate the vibration plate, the supporting member including a vibration device exposed portion protruding from the supporting member, Wherein, the first sound generating device is in the vibration device exposed portion.

25. A sound generating device, comprising: a vibration plate comprising 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; as well as a first vibration generating device comprising a piezoelectric material layer and disposed on a rear surface of the vibration plate, The distance between the center of the first vibration generating device and the first short side of the vibration plate is 1 / 4 to 1 / 3 of the distance between the long side of the vibration plate. The sound generating device further comprises a second vibration generating device, Wherein, the second vibration generating device is adjacent to the first vibration generating device and surrounds the first vibration generating device.

26. The sound generating device according to claim 25, wherein The first vibration generating device is spaced apart from the second vibration generating device.

27. The sound generating device according to claim 25, wherein The phase of the signal applied to the first vibration generating device is opposite to the phase of the signal applied to the second vibration generating device.

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