Complete set of equipment

Abstract

The present disclosure relates to a complete set of devices, in particular a display panel that generates sound. The display device according to the present disclosure includes: a display module; a back cover disposed at the back surface of the display module; a recessed portion recessed from the first surface of the back cover into the back cover with a first width and a first depth; a penetration portion penetrating from the second surface of the back cover to the recessed portion with a second width and a second depth, the second width being smaller than the first width and the second depth corresponding to the difference between the thickness of the back cover and the first depth; and a first piezoelectric vibration unit disposed at a stepped portion between the penetration portion and the recessed portion.

Description

[0001] This application is a divisional application of the original invention patent application number 202010588420.1 (application date: June 24, 2020, invention name: display device). Technical Field

[0002] The present disclosure relates to a display device, and in particular to a display panel capable of generating sound. Background Art

[0003] Generally, a display device is used as a screen for displaying visual information, such as a television, a monitor, a laptop computer, a smartphone, a tablet computer, an electronic board wearable device, a watch phone, a portable information device, a navigation system or an electronic product, a vehicle control display device, or a home appliance.

[0004] Typically, a display device includes a display panel for displaying video images and an audio device for providing sound associated with the video images. However, conventional display devices have limitations: because the sound output from the audio device travels toward the rear or bottom of the display panel, sound quality degrades due to interference with sound reflected from walls or floors. Consequently, accurate sound delivery to viewers is difficult, potentially reducing their sense of immersion. Summary of the Invention

[0005] The inventors of the present disclosure have recognized the problems of related display devices and conducted various experiments to improve sound quality and provide sound in front of the display panel when a viewer views an image in front of the display panel. After multiple experiments, the inventors have provided a display device with a new structure that can generate sound that can be directed in front of the display panel and improve sound quality.

[0006] One object of the present disclosure is to provide a display device that accurately prompts a sound. Another object of the present disclosure is to provide a display device that generates a sound that advances toward the front of a display panel.

[0007] Another object of the present disclosure is to provide a display device that improves sound quality and increases viewer immersion. In particular, the present disclosure provides a display device that maintains an ultra-thin structure by installing a sound generating device on the rear side of a display panel within a rear cover.

[0008] In addition to the above technical objectives of the present disclosure, other features and advantages of the present disclosure are described below. From these descriptions, those skilled in the art will clearly understand the technical objectives and advantages.

[0009] According to the present disclosure, a display device includes: a display module; a back cover, which is arranged at the back surface of the display module; a recessed portion, which is recessed into the back cover from the first surface of the back cover with a first width and a first depth; a penetration portion, which penetrates from the second surface of the back cover to the recessed portion with a second width and a second depth, the second width is smaller than the first width, and the second depth corresponds to the difference between the thickness of the back cover and the first depth; and a first piezoelectric vibration unit, which is arranged at a stepped portion between the penetration portion and the recessed portion.

[0010] In one embodiment, the display device further includes an adhesive member attaching the second surface of the rear cover having the penetration portion to the display module.

[0011] In one embodiment, the first piezoelectric vibration unit includes a metal substrate attached at the stepped portion; and a piezoelectric element attached at a rear surface of the metal substrate.

[0012] In one embodiment, the first piezoelectric vibration unit includes: a piezoelectric element attached at the step portion; and a metal substrate attached at a rear surface of the piezoelectric element.

[0013] In one embodiment, the first depth of the recessed portion is less than half the thickness of the back cover.

[0014] In one embodiment, the first depth of the recessed portion is greater than half the thickness of the back cover.

[0015] In one embodiment, the display device further includes a heat dissipation metal plate attached at a portion of the rear surface of the display module exposed by the penetration portion.

[0016] In one embodiment, the display device further includes an upper recessed portion recessed into the rear cover from the second surface of the rear cover with a third width greater than the second width and a third depth less than the second depth.

[0017] In one embodiment, the display device further includes a second piezoelectric vibration unit disposed at an upper stepped portion between the upper recessed portion and the penetration portion.

[0018] In one embodiment, the first piezoelectric vibration unit generates sound vibration having a frequency bandwidth different from that of the second piezoelectric vibration unit.

[0019] In addition, the display device according to the present disclosure includes: a display module, which includes a display panel that displays a video image; a back cover, which is arranged at the back surface of the display module; a first recessed portion, which is formed at the back surface of the back cover; a through hole, which penetrates the back cover from the first recessed portion to the upper surface of the back cover; and a vibration generating module, which is arranged in the first recessed portion for providing sound vibration to the back cover via the through hole.

[0020] In one embodiment, the first recessed portion has a depth greater than that of the through hole.

[0021] In one embodiment, the depth of the first recessed portion is smaller than that of the through hole.

[0022] In one embodiment, a vibration generating module includes: a piezoelectric element; and a metal substrate attached at one of an upper surface and a lower surface of the piezoelectric element.

[0023] In one embodiment, the display device further includes a heat dissipation metal plate attached at a portion of the rear surface of the display module exposed by the through hole.

[0024] In one embodiment, the first recess comprises a first width and a first depth smaller than the thickness of the rear cover. The through hole comprises a second width smaller than the first width and a second depth corresponding to the difference between the thickness of the rear cover and the first depth.

[0025] In one embodiment, the display device further includes: a second recessed portion formed on the upper surface of the rear cover with a third width greater than the second width and a third depth less than the second depth. The thickness of the through hole corresponds to the difference between the second depth and the third depth.

[0026] In one embodiment, the vibration generating module includes: a first piezoelectric vibration unit disposed in the first recess; and a second piezoelectric vibration unit disposed in the second recess.

[0027] In one embodiment, the first piezoelectric vibration unit generates sound vibration having a frequency bandwidth different from that of the second piezoelectric vibration unit.

[0028] In one embodiment, a vibration generating module includes: a piezoelectric element; and a housing surrounding a rear space of the piezoelectric element.

[0029] According to an example of the present disclosure, a display device can be provided that accurately generates and transmits sound, improves sound quality, and increases the viewer's sense of immersion. According to another example of the present disclosure, a display device that generates sound toward the front of a display panel can be provided. Specifically, by utilizing a structure in which a sound generating device that provides sound vibrations to the display panel is embedded in a rear cover, a display device with an ultra-thin structure and a built-in sound generating device can be provided. In addition, by stacking and embedding sound generating devices of various frequency bands in the rear cover, an ultra-thin display device that generates sound in various frequency bands can be provided.

[0030] In addition to the above-mentioned effects of the present disclosure, other features and advantages of the present disclosure may be described below or may be clearly understood by those skilled in the art from the following description and explanation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application. The accompanying drawings illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0032] Figure 1 is a diagram illustrating a display device having a sound generating unit on a rear side according to the present disclosure.

[0033] Figure 2 It is along Figure 1 1-1' in FIG. 1 shows a cross-sectional view of a display device according to a first embodiment of the present disclosure.

[0034] Figure 3 is an enlarged cross-sectional view showing the structure of a display device according to a second embodiment of the present disclosure.

[0035] Figure 4 is a structural enlarged cross-sectional view showing a display structure according to a third embodiment of the present disclosure.

[0036] Figure 5 is a structural enlarged cross-sectional view showing a display structure according to a fourth embodiment of the present disclosure.

[0037] Figure 6 is a structural enlarged cross-sectional view showing a display structure according to a fifth embodiment of the present disclosure.

[0038] Figure 7 is a structural enlarged cross-sectional view showing a display structure according to a sixth embodiment of the present disclosure.

[0039] Figure 8 is a structural enlarged cross-sectional view showing a display structure according to a seventh embodiment of the present disclosure.

[0040] Figure 9 is a structural enlarged cross-sectional view showing a display structure according to an eighth embodiment of the present disclosure.

[0041] Figure 10 is a structural enlarged cross-sectional view showing a display structure according to a ninth embodiment of the present disclosure.

[0042] Figure 11 is a structural enlarged cross-sectional view showing a display structure according to a tenth embodiment of the present disclosure.

[0043] Figure 12 is a structural enlarged cross-sectional view showing a display structure according to an eleventh embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the accompanying drawings to refer to the same or similar parts. In this specification, it should be noted that similar reference numerals that have been used to represent similar elements in other drawings are used for elements whenever possible. In the following description, when functions and configurations known to those skilled in the art are not related to the basic configuration of the present disclosure, their detailed descriptions will be omitted. The terms described in this specification should be understood as follows. The advantages and features of the present disclosure and their implementation methods will become clear through 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 set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In addition, the present disclosure is limited only by the scope of the claims.

[0045] The shapes, sizes, proportions, angles, and quantities disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples, and therefore, the present disclosure is not limited to the details shown. Like reference numerals will always refer to like elements. In the following description, when a detailed description of a related known function or configuration is determined to unnecessarily obscure the key points of the present disclosure, the detailed description will be omitted.

[0046] When “including,” “having,” and “comprising” are used in this specification, another part may also be present unless “only” is used. Terms in the singular form may include plural forms unless otherwise indicated.

[0047] When explaining an element, although not explicitly described, the element is interpreted as including an error area.

[0048] When describing a positional relationship, for example, when the positional order is described as being "on," "above," "below," and "next to," unless "immediately" or "directly" is used, a case where there is no contact therebetween may be included. If a first element is mentioned as being positioned "on" a second element, it does not mean that the first element is substantially positioned above the second element in the drawing. The upper and lower parts of the relevant objects may change depending on the orientation of the objects. Therefore, in the drawings or in actual configurations, a case where a first element is positioned "on" a second element includes a case where the first element is positioned "below" the second element as well as a case where the first element is positioned "above" the second element.

[0049] When describing a time relationship, for example, when a time sequence is described as "after," "following," "next to," and "before," discontinuous cases may be included unless "immediately" or "directly" is used.

[0050] 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.

[0051] When describing the elements of the present disclosure, terms such as first, second, A, B, (a) and (b) may be used. These terms are only for the purpose of distinguishing an element from other elements, and the terms do not limit the nature, order, sequence or quantity of the elements. When an element is described as being "linked," "coupled" or "connected" to another element, unless otherwise indicated, the element may be directly connected to the other element or indirectly connected to the other element. It will be understood that other elements may be "inserted" between the connectable or coupled elements.

[0052] It should be understood that the term "at least one" includes all combinations related to any one item. For example, "at least one of a first element, a second element, and a third element" may include all combinations of two or more elements selected from the first, second, and third elements, as well as individual elements in the first, second, and third elements.

[0053] As will be fully understood by those skilled in the art, the features of the various embodiments of the present disclosure may be partially or fully coupled or combined with each other, 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.

[0054] The term "display device" as used herein may include a liquid crystal module (LCM), an organic light-emitting display module (OLED module), or a quantum dot module (QD module), which includes a display panel and a driver for driving the display panel. A "display device" may also include a complete product or final product including an LCM, OLED module, or QD module, such as a notebook computer, a television, a computer monitor, a device including other modules of an automotive device or vehicle, or a complete set of electronic devices or a complete set of equipment (or complete set of equipment) such as a smartphone or mobile electronic device.

[0055] Therefore, the “display device” may be any of a display apparatus such as an LCM, an OLED module, and a QD module, an application apparatus including an LCM, an OLED module, or a QD module, or a complete apparatus for an end user.

[0056] In another example, an LCM, an OLED module, or a QD module may be referred to as a "display device," and a final electronic device including the LCM, OLED module, or QD module may be referred to as a "set." For example, a display device may include a display panel of a liquid crystal display or an organic electroluminescent display and a source printed circuit board (PCB) for driving the display panel. A set may include a display device and a set PCB or a control PCB that drives the set itself by connecting to the display device and the source PCB.

[0057] The display panel according to the embodiments of the present disclosure may include, but is not limited to, a liquid crystal display panel, an organic light-emitting diode display panel, and an electroluminescent display panel. For example, the display panel may have a structure in which the display panel can vibrate to generate sound. In addition, the display panel used in the display device according to the embodiments of the present disclosure is not limited to the shape or size of the display panel.

[0058] In the case where 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 (or sub-pixels) defined by the gate lines and the data lines. The display panel may include: an array substrate including thin film transistors as switching elements for controlling the light transmittance of each pixel; an upper substrate including a color filter and / or a black matrix; and a liquid crystal layer disposed between the array substrate and the upper substrate.

[0059] In the case where the display panel is an organic light-emitting diode display panel, the display panel may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels (or sub-pixels) defined by the gate lines and the data lines. The display panel may include: an array substrate including thin-film transistors for selectively applying voltage to each pixel; an organic light-emitting layer on the array substrate; and an encapsulation substrate disposed on the array substrate to cover the organic light-emitting layer. The encapsulation substrate may protect the thin-film transistors and the organic light-emitting layer from any external impact and prevent moisture and oxygen from penetrating into the organic light-emitting layer. In addition, the organic light-emitting layer formed on the array substrate may be replaced by an inorganic light-emitting layer, a quantum dot light-emitting layer, or a micro-light-emitting diode element.

[0060] The display device including the sound generation module according to the present disclosure can be applied to a vehicle as a user interface module, such as a central control panel in an automobile. For example, the display panel can be mounted on the central dashboard between the driver's seat and the passenger seat, so that vibrations from the display panel are propagated toward the interior of the vehicle. This improves the in-vehicle sound system compared to conventional speakers located only inside the vehicle.

[0061] Hereinafter, examples of display devices according to the present disclosure will be described in detail with reference to the accompanying drawings. When designating reference numerals to elements in the various figures, identical components may be assigned the same reference numerals whenever possible, even if they are illustrated in different figures. For ease of description, the proportions of elements illustrated in the figures may differ from those in reality and are not limited to the proportions shown in the figures.

[0062] Figure 1 is a diagram showing a display device having a sound generating unit on the rear side according to the present disclosure. Figure 1 The display device according to the present disclosure can output sound or voice PVS based on the vibration of the display module 100 for presenting image data. For example, in the display device, the sound generation unit 500 can vibrate the display module 100 to output the voice PVS. Most of the voice PVS generated by the vibration of the display module 100 can be output directly toward the front FD of the screen of the display device. The display device according to the present disclosure can use the display module 100 as a diaphragm that generates and outputs the voice PVS toward the front FD of the screen of the display module 100. Therefore, sound can be accurately transmitted to the viewer, and the sound quality can be improved and the viewer's sense of immersion can be enhanced.

[0063] In the display device according to the present disclosure, the sound generating unit 500 provides a vibration force to the display module 100, and the display module 100 vibrates to emit a sound. The display module 100 may be formed of a substrate that is easy to vibrate (e.g., a large-area glass substrate), and may include a back cover 700 and a guide panel 300 for supporting the display module 100 on the rear surface of the display device. By mounting a vibration generating device to the rear surface of the display module 100 instead of the speaker used in the prior art, the present disclosure can provide a structure that maintains the thickness of the entire display device including the display module 100 at a very thin thickness. Hereinafter, with reference to the accompanying drawings, various embodiments of the present disclosure will be described in detail.

[0064] <First embodiment>

[0065] Figure 2 It is along Figure 1 The cross-sectional view taken along II' in FIG. 1 shows the structure of the display device according to the first embodiment of the present disclosure. When necessary, reference will be made to FIG. 1 showing the overall structure of the display device according to the present disclosure. Figure 1 To describe.

[0066] Reference Figure 2The display device according to the first embodiment of the present disclosure may include a display module 100, a back cover 700, and a sound generating unit 500. The sound generating unit 500 may be implemented as a piezoelectric vibration unit PZ adapted to be mounted within the back cover 700, and the back cover 700 may be coupled to the rear surface of the display module 100. For example, a piezoelectric element or an electroactive material (EAM) may be used for the sound generating unit 500.

[0067] The display module 100 may include a display panel 110, a functional film 130, and a heat diffusion element 150. The display panel 110 may be implemented as various types of displays. The display panel 110 may vibrate in response to the vibration of the sound generating unit 500 to output sound (PVS) directly to the front FD, thereby enabling the display panel 110 to function as a speaker or vibration plate that directly generates sound (PVS). For example, when the display module 100 functions to generate sound (PVS), the display module 100 may be a diaphragm, panel speaker, or flat panel speaker that directly generates sound (PVS).

[0068] In one example, the display panel 110 may include a pixel circuit provided on a substrate (or base substrate) and a pixel array layer (or display unit) connected to the pixel circuit and having an anode, a cathode, and an organic light-emitting layer. The display panel 110 may display an image in a top emission type, a bottom emission type, or a dual emission type according to the structure of the pixel array layer. The anode may be expressed as a first electrode or a pixel electrode, but is not limited to the term. The cathode may be expressed as a second electrode or a common electrode, but is not limited to the term.

[0069] The functional film 130 may include an anti-reflection layer (or anti-reflection film) for preventing ambient light reflection and improving outdoor visibility and contrast of the image displayed on the display panel 110. For example, the anti-reflection layer may be a circular polarization layer (or circular polarization film) that prevents reflected light from being reflected toward the viewer by thin film transistors and / or wires disposed at the pixel array layer of the display panel 110. Although not shown in the figures, the functional film 130 may be attached to the display panel 110 using a transparent adhesive layer.

[0070] In one example, the functional film 130 may further include a light path control layer (or optical film) that adjusts the path of light emitted from the pixel array layer of the display panel 110 toward the viewer. The light path control layer may include a structure in which high-refractive layers and low-refractive layers are alternately stacked, thereby changing the path of light incident from the pixel array layer to minimize the color shift phenomenon depending on the viewing angle. In this case, the low-refractive layer may be provided at the topmost layer of the light path control layer.

[0071] In one example, the display module 100 may further include a touch electrode unit for a user interface utilizing the user's touch. The touch electrode unit may be inserted between the display panel 110 and the functional film 130 or embedded in the display panel 110 of an in-cell touch type. For the in-cell touch type example, the touch electrode unit may include a mutual capacitance type or a self-capacitance type touch electrode.

[0072] The heat diffusion member 150 may have a thin sheet shape that is attached to the entire rear surface of the display panel 110. The heat diffusion member 150 may be disposed on the rear surface of the display module 100 so as to overlap with the sound generation unit 500. This allows heat generated during operation of the sound generation unit 500 to diffuse toward the display module 100. This prevents heat-induced performance degradation of the sound generation unit 500. Furthermore, the heat diffusion member 150 may have a size corresponding to the entire rear surface of the display panel 110 so as to diffuse heat generated during operation of the sound generation unit 500 over a wider area. This prevents heat from being concentrated in a localized area of the display module 100 that overlaps with the sound generation unit 500, thereby minimizing or preventing localized brightness unevenness of the display module 100.

[0073] For example, the heat diffusion member 150 may include a material having high thermal conductivity, such as any one of aluminum (Al), copper (Cu), silver (Ag), and magnesium (Mg), or alloys thereof, but is not limited thereto.

[0074] The back cover 700 may be provided on the rear surface of the display module 100. The sound generating unit 500 may be installed or fixed therein.

[0075] In one example, the back cover 700 may cover the rear surface of the display module 100. The back cover 700 may be represented as a support member, a housing, a system cover, a cover, a rear cover, a cover bottom, a rear frame, or a chassis, but is not limited thereto. The rear surface of the display module 100 may be represented as a side, a first side, a back surface, or a lower surface, but is not limited thereto.

[0076] The back cover 700 may be attached to the rear surface of the display module 100 using an adhesive member 600. The adhesive member 600 may include, but is not limited to, a pressure-sensitive adhesive (PSA), an optically clear adhesive (OCA), or an optically clear resin (OCR). Attached to the entire rear surface of the display module 100, the back cover 700 may be used to protect the rear surface of the display module 100 from any external impact and to dissipate heat generated by the display module 100.

[0077] In one example, the back cover 700 may have a plate shape covering the entire rear surface of the display module 100 (i.e., the entire rear surface of the heat diffusion member 150). In some examples, the edge portion or corner portion of the back cover 700 may have an inclined shape or a curved shape through a chamfering or rounding process.

[0078] In one example, the back cover 700 may include a penetration portion S1 or a recessed portion S2. The penetration portion S1 may be a through hole that penetrates the back cover 700 from the front surface to the back surface. The recessed portion S2 may have a well shape in which some thickness of the back cover 700 is removed to sink from the back surface. The recessed portion S2 and the penetration portion S1 may be continuously formed to have concentric circles, so that the back cover 700 may have a through hole including the recessed portion S2 and the penetration portion S1.

[0079] The width of the penetration portion S1 may be smaller than that of the recessed portion S2. In this case, a step portion TH may be formed between the penetration portion S1 and the recessed portion S2. Here, the penetration portion S1 and the recessed portion S2 may have the same depth, or the depth of either one may be greater than the other. Figure 2 A case is shown in which the penetration portion S1 has the same depth as that of the recessed portion S2.

[0080] The piezoelectric vibration unit PZ may be mounted in the recess S2. Specifically, the piezoelectric vibration unit PZ may be fixed at the step portion TH using an adhesive AH. Figure 2 As shown, the piezoelectric vibration unit PZ may be installed in the back cover 700 so that the entire thickness of the display device is not increased to maintain the thin state of the original back cover thickness.

[0081] Preferably, the sound generating unit 500 may be made of a thin-film element such as a piezoelectric vibrating unit PZ to achieve a thin structure for the display device. A blank space, formed by a penetration S1, is provided between the piezoelectric vibrating unit PZ and the display panel 100. The vibrations generated by the piezoelectric vibrating unit PZ vibrate the air within the space of the penetration S1, which in turn vibrates the portion of the rear surface of the display module 100 corresponding to the penetration S1. As a result, the sound PVS is transmitted toward the front FD.

[0082] In one example, the display device may include a sound generating module provided at the center portion (or middle area) of the display module 100. In detail, one sound generating module may vibrate the rear center portion of the display module 100 to provide sound PVS from the vibration of the display module 100.

[0083] In another example, the display device may include a first sound generating unit provided at a first area (or left area) relative to the center line of the rear surface of the display module 100 and a second sound generating unit provided at a second area (or right area). In detail, the first sound generating unit may vibrate the first rear area of the display module 100 to provide sound PVS by the vibration of the first area of the display module 100. The second sound generating unit may vibrate the second rear area of the display module 100 to provide sound PVS by the vibration of the second area of the display module 100. Thus, the display device can output two-channel stereo by separating the left and right sounds using the first and second sound generating units. In this case, the first sound generating unit may be configured to output left-ear sound, and the second sound generating unit may be configured to output right-ear sound.

[0084] In one example, at least one sound generating unit 500 may be provided within the rear cover 700 to provide sound (PVS) by vibrating the display module 100. That is, the sound generating unit 500 may be surrounded by the rear cover 700 so that it is hidden and not exposed to the outermost rear surface of the display device. Therefore, the display device according to an embodiment of the present disclosure may have a clean rear design that is inconspicuous to the user, thereby visually enhancing the design of the rear structure of the display device.

[0085] In one example, at least one sound generating unit 500 may be a single structure or a single element modularized into a single component. Specifically, the sound generating unit 500 may be manufactured in the form of a final product such as a single structure or a single element through a modularization process (or assembly process) that is not included in the assembly process of the display device. Thereafter, during the assembly process of the display device, the sound generating unit 500 may be mounted at the stepped portion TH provided in the back cover 700 through a component mounting process. Therefore, the present disclosure can improve the assembly process of the sound generating unit 500 to the display device, thereby enhancing productivity.

[0086] The display device according to the first embodiment of the present disclosure may further include a guide panel 300. The guide panel 300 may support outer circumferences of the display module 100 and the back cover 700, respectively, and may have a structure surrounding respective side surfaces of the display module 100 and the back cover 700.

[0087] In one example, the guide panel 300 may be attached to the rear periphery of the display module 100 using a guide adhesive 3H. The guide panel 300 may be denoted as a middle cabinet, a middle cover, or a middle frame, but is not limited thereto.

[0088] In one example, the guide panel 300 may include a metal material or a plastic material. Specifically, the guide panel 300 may be preferably made of a metal material to improve the side appearance design of the display device and protect the side surface of the display device.

[0089] In one example, the guide panel 300 may include a support member 310 and a sidewall 330 .

[0090] The support member 310 can be coupled to the back cover 700 by being inserted into a groove formed in a side surface of the back cover 700 of the display module 100. The front surface of the support member 310 can be combined with a surface on one side of the groove portion of the back cover 700 using a guide adhesive 3H. The support member 310 can have any thickness, but it is preferable that it is easily engaged with the back cover 700 and has sufficient rigidity so that it is not easily separated from the back cover 700.

[0091] In one example, the support member 310 may have a single frame structure in a square shape, but is not limited thereto. For example, the support member 310 may have a plurality of split bar shapes inserted into the edge of the back cover 700 .

[0092] The guiding adhesive 3H may be provided between the groove portion of the rear cover 700 and any inner side of the support member 310. For example, the guiding adhesive 3H may be an adhesive resin, a double-sided tape, or a double-sided adhesive foam pad, but is not limited thereto.

[0093] The sidewall 330 may be vertically coupled to the outer surface of the support element 310 so as to be parallel to the thickness direction Z of the display device. The sidewall 330 may surround both the outer surface (or outer wall) of the display module 100 and the outer surface of the back cover 700. Therefore, the sidewall 330 may protect the outer surface of each of the display module 100 and the back cover 700 to improve the exterior design of the side surface of the display device. In one example, when the support elements 310 are coupled to each other to form a single body, the guide panel 300 may have a frame structure having a cross-sectional structure in the shape of a "┣".

[0094] The display according to the present disclosure may include an adhesive element instead of the guide panel 300. Interposed between the rear edge of the display module 100 and the front edge of the back cover 700, the adhesive element may bond the display module 100 and the back cover 700.

[0095] In the case where the display device includes an adhesive element instead of the guide panel 300 , the back cover 700 may include a sidewall cover portion surrounding an outer surface (or outer wall) of the display module 100 and an outer surface of the back cover 700 and an outer surface of the adhesive element.

[0096] According to the display device of the present disclosure, the display panel 110 can be vibrated by the sound generating unit 500 provided in the back cover 700 bonded to the rear surface of the display module 100, and the sound PVS generated by the vibration can be output to the front FD. Therefore, the immersion of the viewer when watching the video information of the display device can be improved.

[0097] In addition, according to the first embodiment of the present disclosure, the display device can provide sound PVS from the vibration of the display panel 110, thereby eliminating the need for an additional speaker. Therefore, the freedom of design of the set and placement of the speaker can be improved.

[0098] Hereinafter, in various embodiments of the present disclosure, the sound generating unit 500 as the core configuration of the present disclosure, particularly, the installation structure of the piezoelectric vibration unit PZ in the back cover 700 will be described in detail.

[0099] <Second embodiment>

[0100] Figure 3 is an enlarged cross-sectional view showing the structure of a display device according to a second embodiment of the present disclosure. Figure 3 yes Figure 1 : is an enlarged view of a portion indicated by a circle A. Hereinafter, a main configuration of the second embodiment will be mainly described. Figure 3 Configurations not shown in the figure can be referred to Figure 1 and Figure 2 .

[0101] Reference Figure 3 The display device according to the second embodiment of the present disclosure may include a display module 100, a back cover 700, and a piezoelectric vibration unit PZ. The display module 100 may be the same as that of the first embodiment, and thus a detailed description thereof will not be repeated.

[0102] In addition to the detailed structure of the penetration portion S1 and the recessed portion S2, the back cover 700 may also be the same as the first embodiment. The back cover 700 may include a penetration portion S1 and a recessed portion S2. The recessed portion S2 may have a well shape from the rear surface 700D of the back cover 700 to a certain depth within the back cover 700 is removed or recessed. The penetration portion S1 may have a through-hole shape by being removed from the front surface 700U of the back cover 700 through the back cover 700 to the recessed portion S2. That is, the sum of the depth of the penetration portion S1 and the depth of the recessed portion S2 may correspond to the entire thickness of the back cover 700.

[0103] The penetration portion S1 and the recessed portion S2 are connected to each other to have a structure that passes through the back cover 700. However, the recessed portion S2 is not a structure for penetrating the back cover 700, but a structure for installing the piezoelectric vibration unit PZ inside the back cover 700. Therefore, the recessed portion S2 may be represented as a recessed portion, a sinking hole, or a sinking portion, but is not limited thereto. On the contrary, the penetration portion S1 may be formed to provide a space for accurately or precisely transmitting the vibration generated from the piezoelectric vibration unit PZ installed at the recessed portion S2 to the rear surface of the display panel 100. Therefore, the penetration portion S1 may be represented as an opening, a through hole, or a perforation, but is not limited thereto.

[0104] Therefore, in the cross-sectional view of the penetration portion S1 and the recessed portion S2, a stepped structure may be formed between the front surface 700U of the back cover 700 and the back surface 700B of the back cover 700. For example, the penetration portion S1 may have a first width and a first depth. The first width may correspond to the width of the opening formed at the front surface 700U of the back cover 700. The first depth may correspond to the recessed depth of the opening extending into the back cover 700. For example, the first depth may correspond to the length of the sidewall 701 of the penetration portion S1.

[0105] The recessed portion S2 may correspond to a space provided between the intermediate surface 702 and the rear surface of the rear surface 700D, wherein the intermediate surface 702 may extend from the inner end of the side wall 701 of the penetration portion S1 in the horizontal direction of the rear cover 700. For example, the recessed portion S2 may have a second width and a second depth. The second width may correspond to the width of the opening formed at the rear surface 700D of the rear cover 700. The second depth may correspond to the recessed depth of the opening of the recessed portion S2 extending into the rear cover 700. For example, the second depth may correspond to the length of the side surface 703 of the recessed portion S2.

[0106] Here, the second width, which refers to the size of the opening of the recessed portion S2, may be greater than the first width, which refers to the size of the opening of the penetrating portion S1. The second depth, which refers to the depth of the recessed portion S2, may be the same as the first depth, which refers to the depth of the penetrating portion S1. The penetrating portion S1 and the recessed portion S2 may be arranged so that their centers overlap to form a symmetrical shape, but are not limited thereto. Otherwise, the penetrating portion S1 may be arranged offset from the recessed portion S2.

[0107] The piezoelectric vibration unit PZ according to the second embodiment may include a piezoelectric vibrator PE and a metal substrate SU. The piezoelectric vibrator PE may be referred to as a piezoelectric resonator or a piezoelectric actuator. The piezoelectric vibrator PE refers to a device that generates vibration by applying an electric field using the principle that deformation occurs when an electric field is applied to two different types of crystals, or that piezoelectricity is generated when an external force is applied to the crystals.

[0108] The metal substrate SU may be disposed at the intermediate surface 702 between the recessed portion S2 and the penetration portion S1 formed at the rear cover 700. For example, the metal substrate SU may be attached at the intermediate surface 702 using an adhesive element AH. The piezoelectric vibrator PE may be attached at the rear surface of the metal substrate SU.

[0109] For example, the piezoelectric vibrator PE and the metal substrate SU may be made into one body, and the outer periphery of the metal substrate SU may be attached at the intermediate surface 702 using the adhesive member AH.

[0110] When the piezoelectric vibrator PE generates vibrations by electricity, the air in the penetration portion S1 can vibrate due to the movement of the metal substrate SU, thereby generating sound pressure. This sound pressure can be transmitted to the rear surface of the display panel 100, and the display panel 100 can vibrate so that the sound vibration can be transmitted to the entire display panel 100.

[0111] Here, the vibration generated by the piezoelectric vibrator PE can be determined as a sound wave of a predetermined frequency band according to the type and thickness of the metal substrate SU. For example, when the thickness of the metal substrate SU is thin, high-frequency sound can be generated, and when the thickness is thick, low-frequency sound can be generated.

[0112] Furthermore, the vibrations generated by the piezoelectric vibrator PE can be determined as sound waves of a predetermined frequency band based on the volume of the penetrating portion S1. For example, as the volume of the penetrating portion S1 increases, lower and lower sound frequency vibrations can be generated. In some examples, the sound quality can be varied by adjusting the volume and shape of the penetrating portion S1.

[0113] <Third embodiment>

[0114] Figure 4 is a structural enlarged cross-sectional view showing a display structure according to a third embodiment of the present disclosure. Figure 4 yes Figure 1 Hereinafter, the main elements of the third embodiment will be described. Figure 4 For components not shown in the figure, please refer to Figures 1 to 3 .

[0115] Reference Figure 4 The display device according to the third embodiment of the present disclosure may include a display module 100, a back cover 700, and a piezoelectric vibration unit PZ. The display module 100 may be the same as that of the first embodiment, and thus a detailed description thereof will not be repeated.

[0116] In the third embodiment, the piezoelectric vibration unit PZ may include a piezoelectric vibrator PE and a metal substrate SU. The piezoelectric vibrator PE may be disposed at an intermediate surface 702 between a recessed portion S2 and a penetration portion S1 formed in a rear cover 700. For example, the piezoelectric vibrator PE may be attached to the intermediate surface 702 using an adhesive element AH. The metal substrate SU may be attached to the rear surface of the piezoelectric vibrator PE.

[0117] For example, the piezoelectric vibrator PE and the metal substrate SU may be made into one body, and the outer periphery of the metal substrate SU may be attached at the intermediate surface 702 using the adhesive member AH.

[0118] When the piezoelectric vibrator PE generates vibrations by electricity, the air in the penetration portion S1 may vibrate, and then sound pressure may be generated. This sound pressure may be transmitted to the rear surface of the display panel 100, and some parts of the display panel 100 corresponding to the penetration portion S1 may vibrate, so that the sound vibration can be transmitted to the entire display panel 100.

[0119] Using the metal substrate SU attached to the rear surface of the piezoelectric vibrator PE, the frequency band of the sound generated by the piezoelectric vibrator PE can be adjusted. In addition, the heat generated from the piezoelectric vibrator PE can be radiated to the external environment of the recessed portion S2.

[0120] <Fourth embodiment>

[0121] Figure 5 is a structural enlarged cross-sectional view showing a display structure according to a fourth embodiment of the present disclosure. Figure 5 yes Figure 1 Hereinafter, the main elements of the fourth embodiment will be described. Figure 5 For components not shown in the figure, please refer to Figures 1 to 4 .

[0122] Reference Figure 5 The display device according to the fourth embodiment of the present disclosure may include a display module 100, a back cover 700, and a piezoelectric vibration unit PZ. The display module 100 may be the same as that of the above embodiment, and thus a detailed description thereof will not be repeated.

[0123] The piezoelectric vibration unit PZ according to the fourth embodiment may include a piezoelectric vibrator PE, a first metal substrate SU1, and a second metal substrate SU2. The piezoelectric vibration unit PZ according to the fourth embodiment may have all the characteristics of the piezoelectric vibration units PZ according to the second and third embodiments.

[0124] The first metal substrate SU1 may be disposed at the intermediate surface 702 between the recessed portion S2 and the penetration portion S1 formed at the rear cover 700. For example, the first metal substrate SU1 may be attached at the intermediate surface 702 using an adhesive element AH.

[0125] The piezoelectric vibrator PE may be attached to the rear surface of the first metal substrate SU1. The piezoelectric vibrator PE may be attached to the middle portion of the rear surface of the first metal substrate SU1. In other examples, even if not shown in the drawings, the entire surface of the first metal substrate SU1 may have the same size of the piezoelectric vibrator PE.

[0126] The second metal substrate SU2 may be attached to the rear surface of the piezoelectric vibrator PE. For example, the second metal substrate SU2 may cover the entire rear surface of the piezoelectric vibrator PE and be formed in an integral shape with the piezoelectric vibrator PE.

[0127] In one example, the first metal substrate SU1 , the piezoelectric vibrator PE, and the second metal substrate SU2 may be formed as one body, and then the outer periphery of the first metal substrate SU1 may be attached at the intermediate surface 702 using an adhesive member.

[0128] When the piezoelectric vibrator PE generates vibrations by electricity, the air in the penetration portion S1 may vibrate, and then sound pressure may be generated. This sound pressure may be transmitted to the rear surface of the display panel 100, and some portions of the display panel 100 corresponding to the penetration portion S1 may vibrate, so that the sound vibration may be transmitted or propagated to the entire display panel 100.

[0129] By using a first metal substrate SU1 attached to the front surface of the piezoelectric vibrator PE and a second metal substrate SU2 attached to the rear surface of the piezoelectric vibrator PE, the frequency band range of the sound generated by the piezoelectric vibrator PE can be adjusted to be wider and more diverse. Furthermore, when the first metal substrate SU1 and the second metal substrate SU2 are arranged on both surfaces of the piezoelectric vibrator PE, heat generated by the piezoelectric vibrator PE can be more effectively radiated to the external environment through the penetration portion S1 and / or the recessed portion S2. In other words, by providing a further metal substrate, higher quality sound can be achieved, and the heat dissipation effect can be further improved compared to the third embodiment.

[0130] <Fifth embodiment>

[0131] Figure 6 : is a structural enlarged cross-sectional view showing a display structure according to a fifth embodiment of the present disclosure. Figure 6 The structure of the display device according to the fifth embodiment shown may be very similar to that of the display device according to the first embodiment. The difference is that the volume of the penetration portion S1 may be significantly smaller than the volume of the recessed portion S2. Figure 6 On the contrary, even though not shown in the drawings, the volume of the penetration portion S1 may be significantly larger than the volume of the recessed portion S2 .

[0132] By setting the volume of the penetrating portion S1, the bandwidth of the sound generated by the piezoelectric vibration unit PZ can be adjusted. For example, when the piezoelectric vibration unit PZ is designed to generate high-frequency sound, the volume of the penetrating portion S1 can be made as small as possible. Conversely, when the piezoelectric vibration unit PZ is designed to generate low-frequency sound, the volume of the penetrating portion S1 can be made as large as possible.

[0133] Although not shown in the figure, when setting the volume of the penetration portion S1, the side wall 701 of the penetration portion S1 in the cross-sectional view can be formed on a diagonal line rather than a vertical line, so that the volume of the penetration portion S1 can be designed differently. In addition, in order to suppress the resonance phenomenon of the sound generated by the piezoelectric vibration unit PZ, the cross-sectional profile of the side wall 701 of the penetration portion S1 can be formed to have a sawtooth or wave shape rather than a straight line. In addition, the shape of the opening of the penetration portion S1 (in the top view) can be formed to have a sawtooth irregular closed curve rather than a circular or polygonal curve.

[0134] In the above embodiment, various examples are described in which only one piezoelectric vibration unit PZ is provided in one sound generating unit 500. Hereinafter, various embodiments will be described in which two piezoelectric vibration units PZ are provided in one sound generating unit 500.

[0135] <Sixth embodiment>

[0136] Figure 7 1 is an enlarged cross-sectional view showing a display structure according to a sixth embodiment of the present disclosure. Figure 1 To describe.

[0137] Reference Figure 7 The display device according to the sixth embodiment of the present disclosure may include a display module 100, a rear cover 700, and a sound generating unit 500. Preferably, the sound generating unit 500 may be implemented as a piezoelectric vibration unit PZ coupled to the rear surface of the display module 100 and adapted to be installed in the rear cover 700. For example, the sound generating unit 500 may include a piezoelectric element or an electroactive material (EAM).

[0138] The display module 100 may include a display panel 110, a functional film 130, and a heat diffusion element 150. The display module 100 may be the same as that in the above embodiment, and will not be described again.

[0139] The back cover 700 may be provided at the rear surface of the display panel 100. The sound generating unit 500 may be installed in the back cover 700. For example, the back cover 700 may be attached to the rear surface of the display module 100 using an adhesive element 600. The adhesive element 600 may include, but is not limited to, a pressure-sensitive adhesive (PSA), an optically clear adhesive (OCA), or an optically clear resin (OCR). By being attached to the entire rear surface of the display module 100, the back cover 700 may protect the rear surface of the display module 100 from external impact and radiate heat generated from the display module 100 to the external environment.

[0140] In one example, the back cover 700 may include an upper recessed portion Sa, a penetration portion Sb, and a lower recessed portion Sc. The upper recessed portion Sa may have a first well shape in which some portions of the back cover 700 are removed from the front surface by a first thickness. The lower recessed portion Sc may have a second well shape in which other portions of the back cover 700 are removed from the rear surface by a second thickness. In addition, the penetration portion Sb may have a through hole that penetrates the remaining back cover 700 between the upper recessed portion Sa and the lower recessed portion Sc. Therefore, when viewed in cross section, the stepped portion 700C forming the penetration portion Sb may have a structure that protrudes between the upper recessed portion Sa and the lower recessed portion Sc.

[0141] When the upper recessed portion Sa, the penetration portion Sb, and the lower recessed portion Sc are continuously formed, the through hole may be formed as one piece. The width (or diameter) of the penetration portion Sb may be smaller than the width of the upper recessed portion Sa or the lower recessed portion Sc. Therefore, a first step portion TH1 may be formed between the upper recessed portion Sa and the penetration portion Sb, and a second step portion TH2 may be formed between the lower recessed portion Sc and the penetration portion Sb. Here, the depth of the penetration portion Sb and the depth of the upper recessed portion Sa or the depth of the lower recessed portion Sc may be the same. Otherwise, one of them may be larger than the other. Figure 7 , the upper recessed portion Sa and the lower recessed portion Sc have the same depth, and the penetration portion Sb has a depth smaller than those of the upper recessed portion Sa and the lower recessed portion Sc.

[0142] The upper recessed portion Sa, the penetration portion Sb, and the lower recessed portion Sc are continuously linked so that the back cover 700 is completely penetrated. However, the upper recessed portion Sa and the lower recessed portion Sc do not penetrate the back cover 700. The upper recessed portion Sa is a structure for mounting the first piezoelectric vibration unit PZ1, and the lower recessed portion Sc is a structure for mounting the second piezoelectric vibration unit PZ2. The penetration portion Sb is a structure for preparing a space for transmitting the acoustic vibrations generated by the first piezoelectric vibration unit PZ1 and the second piezoelectric vibration unit PZ2 to the rear surface of the display panel 100.

[0143] Therefore, according to the cross-sectional view of the upper recessed portion Sa, the penetration portion Sb, and the lower recessed portion Sc, an irregular (or stepped) shape is formed between the front surface 700U and the rear surface 700D of the rear cover 700. For example, the upper recessed portion Sa may have a first width and a first depth. The first width may refer to the width of the opening formed at the front surface 700U of the rear cover 700. The first depth may refer to the length of the opening of the upper recessed portion Sa extending from the front surface 700U into the rear cover 700. For example, the first depth of the upper recessed portion Sa may correspond to the length of the sidewall 7001 of the upper recessed portion Sa.

[0144] The penetration portion Sb may have a second width and a second depth. The second width may refer to the width of the opening formed at the stepped portion 700C. The second depth may refer to the depth of the penetration portion Sb penetrating the stepped portion 700C. For example, the second depth may correspond to the length of the sidewall 7003 of the penetration portion Sb.

[0145] The lower recessed portion Sc may have a third width and a third depth. The third width may refer to the width of the opening formed at the rear surface 700D of the back cover 700. The third depth may refer to the length of the opening of the lower recessed portion Sc extending from the rear surface 700D into the back cover 700. For example, the third depth of the lower recessed portion Sc may correspond to the length of the sidewall 7005 of the upper recessed portion Sa.

[0146] When the stepped portion 700C has an extruded structure, the stepped portion 700C may have an upper surface 7002, a sidewall 7003 of the penetration portion Sb, and a lower surface 7004. For example, the upper surface 7002 may be a plane connecting the lower side of the sidewall 7001 of the upper recessed portion Sa and the upper side of the sidewall 7003 of the penetration portion Sb. The lower surface 7004 may be a plane connecting the lower side of the sidewall 7003 of the penetration portion Sb and the sidewall 7005 of the lower recessed portion Sc.

[0147] Here, the first width, which refers to the size of the opening of the upper recessed portion Sa, may be greater than the second width, which refers to the size of the opening of the penetration portion Sb. Furthermore, the first depth, which refers to the depth of the upper recessed portion Sa, may be greater than the second depth, which refers to the depth of the penetration portion Sb. The third width, which refers to the size of the opening of the lower recessed portion Sc, may be the same as the first width. Furthermore, the third depth, which refers to the depth of the lower recessed portion Sc, may be the same as the first depth.

[0148] The upper recessed portion Sa, the penetration portion Sb, and the lower recessed portion Sc may be arranged so that the centers overlap to form a concentric shape, but are not limited thereto. The respective centers may be relatively offset and arranged to one side.

[0149] In the sixth embodiment, the sound generating unit 500 may include a first piezoelectric vibration unit PZ1 and a second piezoelectric vibration unit PZ2. The first piezoelectric vibration unit PZ1 may be attached to the upper surface 7002 of the stepped portion 700C1 using a first adhesive AH1. The second piezoelectric vibration unit PZ2 may be attached to the lower surface 7004 of the stepped portion 700C using a second adhesive AH2.

[0150] For example, the first piezoelectric vibration unit PZ1 may include a first piezoelectric vibrator PE1 and a first metal substrate SU1. The first metal substrate SU1 may be mounted on an upper surface 7002 of a stepped portion 700C disposed between an upper recess Sa and a penetration portion Sb. For example, the first metal substrate SU1 may be attached to the upper surface 7002 of the stepped portion 700C using a first adhesive AH1. Furthermore, the first piezoelectric vibrator PE1 may be attached to the upper surface of the first metal substrate SU1.

[0151] Furthermore, the second piezoelectric vibration unit PZ2 may include a second piezoelectric vibrator PE2 and a second metal substrate SU2. The second metal substrate SU2 may be mounted on the lower surface 7004 of the stepped portion 700C disposed between the lower recess Sc and the penetration portion Sb. For example, the second metal substrate SU2 may be attached to the lower surface 7004 of the stepped portion 700C using a second adhesive AH2. Furthermore, the second piezoelectric vibrator PE2 may be attached to the lower surface of the second metal substrate SU2.

[0152] In another example, the first piezoelectric vibrator PE1 and the first metal substrate SU1 may be formed as a single body, and the periphery of the first metal substrate SU1 may be attached to the upper surface 7002 of the stepped portion 700C using a first adhesive AH1. Furthermore, the second piezoelectric vibrator PE2 and the second metal substrate SU2 may be formed as a single body, and the periphery of the second metal substrate SU2 may be attached to the lower surface 7004 of the stepped portion 700C using a second adhesive AH2.

[0153] When the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 generate vibrations by electricity, the air in the upper recessed portion Sa and the penetration portion Sb may vibrate through the first and second metal substrates SU1 and SU2, and then sound pressure may be generated. This sound pressure may be transmitted to the rear surface of the display panel 100, and some portions of the display panel 100 corresponding to the openings may vibrate, so that the sound vibrations may be transmitted or propagated to the entire display panel 100.

[0154] Here, the vibrations generated by the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 can be defined as having a specific acoustic wave bandwidth depending on the thickness of the first and second metal substrates SU1 and SU2. For example, as the thickness of the first and second metal substrates SU1 and SU2 decreases, the acoustic vibrations can have a higher frequency bandwidth. As the thickness of the first and second metal substrates SU1 and SU2 increases, the acoustic vibrations can have a lower frequency bandwidth.

[0155] In addition, when the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 generate acoustic vibrations with the same phase in the same frequency bandwidth, a resonance effect that amplifies the volume can be obtained due to the structure in which the first metal substrate SU1 and the second metal substrate SU2 face each other symmetrically. For example, the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 may be composed of piezoelectric elements or electroactive materials, and the polarities of the driving voltages may be opposite to each other. In this case, as Figure 7 As shown, a resonance effect can be obtained, so that the amplitude of the sound vibration can be doubled due to the symmetrical arrangement structure. As a result, a 2-way structure with increased amplitude and increased sound pressure can be obtained.

[0156] With the structure of the sixth embodiment of the present disclosure, in a thin-structure display device, rich sound quality with improved amplitude and sound pressure can be obtained without installing a speaker that is easily visible from the outside.

[0157] <Seventh embodiment>

[0158] Figure 8 is a structural enlarged cross-sectional view showing a display structure according to a seventh embodiment of the present disclosure. Figure 8 The display device according to the seventh embodiment of the present disclosure may have Figure 7 The structure is very similar to that of the sixth embodiment shown, except that the first piezoelectric vibrator PE1 has a different size from the second piezoelectric vibrator PE2 in the seventh embodiment.

[0159] The size difference between the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 is not only for illustrating the size, but also for illustrating the difference in bandwidth of the sound vibration. For example, a vibrator of a smaller size can generate sound vibration in a higher frequency bandwidth than a vibrator of a larger size. Figure 8 As shown, the first piezoelectric vibrator PE1 may be disposed in the upper recess Sa for generating high-frequency sound vibrations, and the second piezoelectric vibrator PE2 may be disposed in the lower recess Sc for generating low-frequency sound vibrations.

[0160] In one example, the first piezoelectric vibrator PE1 may be a small-area piezoelectric element or EAM capable of implementing a tweeter, and the second piezoelectric vibrator PE2 may be a large-area piezoelectric element or EAM capable of implementing a woofer.

[0161] In the display device according to the seventh embodiment of the present disclosure, by placing two vibrators that generate sound vibrations of different frequency bandwidths in the same space in a stacked structure, the display device can generate sounds of various frequency bandwidths. Therefore, by independently providing high-frequency sounds and mid-range sounds without exposing the speaker to the thin exterior of the display device, richer sound quality can be provided.

[0162] <Eighth Embodiment>

[0163] Figure 9 is a structural enlarged cross-sectional view showing a display structure according to an eighth embodiment of the present disclosure. Figure 9 The display device according to the eighth embodiment of the present disclosure shown may have Figure 8 The structure is very similar to that of the seventh embodiment shown in the figure, except that the first piezoelectric vibrator PE1 is provided at a position different from that of the second piezoelectric vibrator PE2 in the eighth embodiment.

[0164] like Figure 9 As shown, the second piezoelectric vibrator PE2, which generates low-bandwidth sound, can be positioned in the upper recess Sa, while the first piezoelectric vibrator PE1, which generates high-bandwidth sound, can be positioned in the lower recess Sc. For example, the first piezoelectric vibrator PE1 can be a small-area piezoelectric element or EAM capable of implementing a tweeter. The second piezoelectric vibrator PE2 can be a large-area piezoelectric element or EAM capable of implementing a woofer.

[0165] In the display device according to the eighth embodiment of the present disclosure, by placing two vibrators that generate sound vibrations of different frequency bandwidths in the same space in a stacked structure, the display device can generate sounds of various frequency bandwidths. Therefore, by independently providing high-frequency sounds and mid-range sounds without exposing the speaker to the thin exterior of the display device, richer sound quality can be provided.

[0166] Frequency bandwidth refers to the pitch of a sound. The audible frequency range of 16 to 20,000 Hz can be divided into 10 octaves, and is further divided into low, medium, and high frequency ranges. In detail, it can be classified as follows.

[0167] [Table 1]

[0168]

[0169] In the seventh and eighth embodiments of the present disclosure, each piezoelectric vibrator may be configured to generate sounds of different frequency bandwidths, thereby providing richer sound quality.

[0170] When adjusting a piezoelectric element, it is preferable to be able to efficiently transmit high-frequency sound. In particular, in order to maintain the sound pressure of 5kHz bandwidth sound, the spatial design of the penetration portion may be very important.

[0171] For example, for Figures 2 to 6In the first to fifth embodiments described above, it is important to design the space of the penetration portion S1 so as not to affect the phase of the vibration of the piezoelectric vibration unit PZ when the vibration generated by the piezoelectric vibration unit PZ is reflected by the rear surface of the display panel 100. To prevent this phase shift, the arrival time of the echo must be equal to or less than 1 / 2 of the period of the sound bandwidth, as shown in the following equation 1. In the following equation, the maximum spatial separation distance not affected by reverberation is calculated for a frequency of 5 kHz (a reference for high-frequency sounds).

[0172] [Formula 1]

[0173]

[0174] Here, "t" refers to the arrival time of the echo, and "f" refers to the frequency of the sound.

[0175] Therefore, when calculated based on the sound speed of 343 m / sec, the effective distance (i.e., the first depth) of the penetration portion S1 can be expressed as "343 m / sec×0.0001 sec=0.0343 m=3.43 mm." In the first to fifth embodiments, when the piezoelectric vibration unit PZ generates a sound of 5 kHz, the depth of the penetration portion S1 can have a value of 3.43 mm or less.

[0176] In the above-described embodiment, the depths of the upper recessed portion Sa and / or the penetration portions Sb and S1 may be designed in consideration of the frequency bandwidth generated from the piezoelectric vibration unit to be applied so as to provide high-quality sound without cancellation or disappearance.

[0177] <Ninth embodiment>

[0178] Figure 10 1 is an enlarged cross-sectional view showing a display structure according to a ninth embodiment of the present disclosure. In the ninth embodiment, a case where the heat dissipation metal plate applicable to all previous embodiments can be further configured will be described.

[0179] Figure 10 The first embodiment of the present disclosure is shown. Figure 2 Also included is an enlarged cross-sectional view of an example of a heat dissipation metal plate HP. Figure 10 The display device according to the ninth embodiment of the present disclosure may include a display module 100, a back cover 700, a heat dissipation metal plate HP, and a sound generating unit 500. The display module 100, the back cover 700, and the sound generating unit 500 may select any one of the above embodiments.

[0180] In addition, a heat dissipation metal plate HP may be included. Specifically, the heat dissipation metal plate HP may be attached to the portion of the rear surface of the display panel 100 exposed by the penetration portion S1. Otherwise, the heat dissipation metal plate HP may be another portion of the rear surface of the display panel 100 exposed by the upper recessed portion Sa. The heat dissipation metal plate HP may be attached to the adhesive member 600 applied to the rear surface of the display panel 100 to bond the back cover 700 to the rear surface of the display panel 100.

[0181] By further including a heat dissipation metal plate HP attached to the rear surface of the display panel 100 opposite to the vibration generating unit 500 , the display panel according to the ninth embodiment of the present disclosure can easily discharge the heat generated by the piezoelectric vibration unit PZ into the air without being directly transmitted to the display panel 100 .

[0182] <Tenth embodiment>

[0183] Figure 11 is an enlarged cross-sectional view showing a display structure according to a tenth embodiment of the present disclosure. Figure 11 yes Figure 1 : This is an enlarged view of a portion indicated by a circle A. Hereinafter, a main configuration of the tenth embodiment will be mainly described. Figure 11 Configurations not shown in the figure can be referred to Figures 1 to 10 .

[0184] Reference Figure 11 The display device according to the tenth embodiment of the present disclosure may include a display module 100, a back cover 700, a piezoelectric vibration unit PZ, and an outer housing EN. The display module 100 may be the same as that of the first embodiment, and thus a detailed description will not be repeated.

[0185] In the tenth embodiment, the piezoelectric vibration unit PZ may be provided at the intermediate surface between the recessed portion S2 and the penetrating portion S1. For example, the piezoelectric vibration unit PZ may be attached to the intermediate surface 702 using an adhesive member AH. Figure 4 and Figure 5 As shown, a metal substrate may also be included. In this embodiment, the metal substrate is not considered an essential element.

[0186] In the tenth embodiment, a housing EN may be further included to seal the space of the recessed portion S2 in which the piezoelectric vibration unit PZ is located. As in the previous embodiment, the recessed portion S2 or the lower recessed portion Sc may be configured to be in an open state. In this case, the sound waves generated by the vibration of the piezoelectric vibration unit PZ may be output to the rear from the rear cover 700, so that most of the sound may not be provided to the front.

[0187] The rear space of the open recess S2 is preferably sealed to prevent sound loss to the rear and to concentrate the sound at the front FD. To this end, the housing EN may have a cover shape corresponding to the open area of the recess S2. The housing EN may be made of an elastic material and inserted into the recess S2. Alternatively, although not shown, threads may be formed on the side 703 of the recess S2, and threads may also be formed on the side of the housing EN, so that the housing can close or open the recess S2 according to the interlocking structure of the threads.

[0188] When the piezoelectric vibration unit PZ generates vibrations by electricity, the air in the penetration portion S1 may vibrate, so that sound pressure may be generated. This sound pressure may be transmitted to the rear surface of the display panel 100, and the display panel 100 may vibrate, so that the sound vibration may be transmitted to the entire display panel 100. In addition, when the housing EN seals the recessed portion S2 as the rear space of the piezoelectric vibration unit PZ, the sound vibration reflected by the recessed portion S2 may be reflected by the housing EN back to the front FD.

[0189] <Eleventh Embodiment>

[0190] Figure 12 is a structural enlarged cross-sectional view showing a display structure according to an eleventh embodiment of the present disclosure. Figure 12 yes Figure 1 : This is an enlarged view of a portion indicated by a circle A. Hereinafter, a main configuration of the eleventh embodiment will be described. Figure 12 Configurations not shown in the figure can be referred to Figures 1 to 11 .

[0191] Reference Figure 12 The display device according to the tenth embodiment of the present disclosure may include a display module 100, a back cover 700, and a piezoelectric vibration module PM. The display module 100 may be the same as that of the first embodiment, and thus a detailed description will not be repeated.

[0192] Unlike the previous embodiments, the eleventh embodiment has a feature of including a piezoelectric vibration module PM. The piezoelectric vibration module PM may include a piezoelectric vibration unit PZ and a housing EN formed as one body.

[0193] The piezoelectric vibration unit PZ may be mounted in the housing EN. Even though not shown in the figure, the outer edge of the piezoelectric vibration unit PZ may be attached to a mounting surface provided in the housing EN using an adhesive. The housing EN may be configured so that a portion of the upper surface facing the penetration portion S1 is open so that the vibration generated by the piezoelectric vibration unit PZ can be transmitted to the penetration portion S1 without any loss. For another example, Figure 4 and Figure 5 As shown, a metal substrate attached to the upper surface or the lower surface of the piezoelectric vibration unit PZ may also be provided. In this embodiment, the metal substrate is not considered as an unnecessary element.

[0194] The piezoelectric vibration module PM may be disposed at the intermediate surface 702 between the recessed portion S2 and the penetration portion S1 formed in the back cover 700. For example, the piezoelectric vibration module PM may be attached at the intermediate surface 702 using an adhesive member AH.

[0195] The eleventh embodiment is characterized in that the piezoelectric vibration unit PZ and housing EN described in the tenth embodiment are designed as a single module. The size and shape of the housing EN can be customized to provide a space suitable for the acoustic bandwidth of the piezoelectric vibration unit PZ. Furthermore, the vibration element can be simply installed on the rear surface of the display panel by inserting the housing EN into the recess S2 and sealing it. Furthermore, even in the event of repair work, a damaged piezoelectric vibration module PM can be easily removed and a new one can be simply reinstalled.

[0196] The piezoelectric vibration module PM has a structural feature that uses its own housing EN to seal the space of the recess S2 where the piezoelectric vibration unit PZ is located. When applied to the previous embodiment, all components of the display device can be completed by simply inserting the piezoelectric vibration module PM into the recess S2 or the lower recess Sc.

[0197] Furthermore, since the housing EN is built-in, sound loss to the rear side is prevented and sound is concentrated on the front FD of the display device. The housing EN may have a thin container shape corresponding to the opening area of the recessed portion S2. The housing EN may be made of an elastic material and inserted into the recessed portion S2. Alternatively, although not shown in the figure, threads may be formed on the side 703 of the recessed portion S2, and threads may also be formed on the outside of the housing EN, so that the housing can close or open the recessed portion S2 according to the interlocking structure of the threads.

[0198] The housing EN has been described as having a structure that perfectly seals the rear space of the piezoelectric vibration unit PZ. However, it is not limited to this. In some cases, the housing EN may also include a resonance hole of a predetermined size. In these cases, the housing EN may have a structure that surrounds the rear space of the piezoelectric vibration unit PZ without sealing it.

[0199] When the piezoelectric vibration unit PZ generates vibrations by electricity, the air in the penetration portion S1 may vibrate, so that sound pressure may be generated. This sound pressure may be transmitted to the rear surface of the display panel 100, and the display panel 100 may vibrate, so that the sound vibration may be transmitted to the entire display panel 100. In addition, when the housing EN seals the recessed portion S2 as the rear space of the piezoelectric vibration unit PZ, the sound vibration reflected by the recessed portion S2 may be reflected by the housing EN back to the front FD.

[0200] The display device according to the eleventh embodiment of the present disclosure can provide a modular piezoelectric vibration module PM. The piezoelectric vibration module PM can be freely configured to have a resonance space through the housing EN, and a unique sound vibration mode can be easily configured and controlled. Therefore, high sound quality can be ensured within a desired sound bandwidth, particularly a high bandwidth.

[0201] The features, structures, effects, and the like described in the above examples of the present disclosure are included in at least one example of the present disclosure and are not necessarily limited to one example. In addition, those skilled in the art can implement the features, structures, effects, and the like illustrated in at least one example of the present disclosure by combining or modifying other examples. Therefore, the contents related to these combinations and modifications should be interpreted as included within the scope of this application.

[0202] 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 spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover such modifications and variations to the present disclosure as fall within the scope of the appended claims and their equivalents. In light of the above description, these and other changes may be made to the embodiments. Generally, in the following claims, the terms used should not be interpreted as limiting the claims to the specific embodiments disclosed in the specification and claims, but rather should be interpreted as including all possible embodiments and the full range of equivalents to which such claims are entitled. Therefore, the claims are not limited by the present disclosure.

Claims

1. A complete set of equipment, comprising: Vibration plate; a rear cover at the rear surface of the vibration plate; a recessed portion, the recessed portion being recessed from the first surface of the rear cover; a penetration portion, the penetration portion penetrating from the second surface of the rear cover to the recessed portion; as well as a first piezoelectric vibration unit provided at a stepped portion between the penetration portion and the recessed portion; The first piezoelectric vibration unit is provided in a space from the first surface of the back cover to the second surface of the back cover, and the space corresponds to the thickness of the back cover. The first piezoelectric vibration unit is provided only in a space of the recessed portion that is recessed from the first surface of the rear cover to the stepped portion, and the first piezoelectric vibration unit does not contact the vibration plate.

2. The complete set of equipment according to claim 1, further comprising: An adhesive member attaches the second surface of the rear cover having the penetration portion to the vibration plate.

3. The complete plant according to claim 1, wherein: The first piezoelectric vibration unit includes: a metal base plate attached at the stepped portion; and A piezoelectric element is attached to the rear surface of the metal substrate.

4. The complete plant according to claim 1, wherein: The first piezoelectric vibration unit includes: a piezoelectric element attached at the stepped portion; and A metal substrate is attached to the rear surface of the piezoelectric element.

5. The complete plant according to claim 1, wherein: The recess comprises a first width and a first depth, and The penetration portion includes a second width and a second depth, the second width is smaller than the first width of the recessed portion, and the second depth corresponds to a difference between the thickness of the back cover and the first depth.

6. The complete plant according to claim 5, wherein: The first depth of the recessed portion is less than half the thickness of the back cover, or Wherein, the first depth of the recessed portion is greater than half of the thickness of the back cover.

7. The complete set of equipment according to claim 1, further comprising: A heat dissipation metal plate is attached to a portion of the rear surface of the vibration plate that is exposed through the penetration portion.

8. The complete set of equipment according to claim 5, further comprising: An upper recessed portion is recessed into the rear cover from the second surface of the rear cover with a third width greater than the second width and a third depth less than the second depth.

9. The complete set of equipment according to claim 8, further comprising: A second piezoelectric vibration unit is provided at an upper stepped portion between the upper recessed portion and the penetration portion.

10. The complete plant according to claim 9, wherein: The first piezoelectric vibration unit generates sound vibration having a frequency bandwidth different from that of the second piezoelectric vibration unit.

11. A complete set of equipment, comprising: Vibration plate; a rear cover provided at a rear surface of the vibration plate; a first recessed portion formed at a rear surface of the rear cover; a through hole penetrating the back cover from the first recessed portion to the upper surface of the back cover; and a vibration generating module disposed in the first recess and fixed at a step portion between the through hole and the first recess for providing sound vibration to the rear cover via the through hole, wherein the vibration generating module is provided in a space from the rear surface of the back cover to the upper surface of the back cover, the space corresponding to the thickness of the back cover, The vibration generating module is disposed only in a space of the first recessed portion that is recessed from the rear surface of the rear cover to the stepped portion, and the vibration generating module does not contact the vibration plate.

12. The plant according to claim 11, wherein: The depth of the first recessed portion is greater than the depth of the through hole.

13. The plant according to claim 11, wherein: The depth of the first recessed portion is smaller than the depth of the through hole.

14. The plant according to claim 11, wherein: The vibration generation module includes: piezoelectric element; and A metal substrate is attached to one of the upper surface and the lower surface of the piezoelectric element.

15. The kit according to claim 11, further comprising: A heat dissipation metal plate is attached to a portion of the rear surface of the vibration plate exposed through the through hole.

16. The complete plant according to claim 11, in, The first recessed portion includes: a first width; and a first depth that is less than the thickness of the back cover, and Wherein, the through hole comprises: a second width that is smaller than the first width; and A second depth corresponding to a difference between the thickness of the rear cover and the first depth.

17. The kit according to claim 16, further comprising: a second recessed portion formed at the upper surface of the rear cover with a third width greater than the second width and a third depth less than the second depth, The thickness of the through hole corresponds to the difference between the second depth and the third depth.

18. The plant according to claim 17, wherein: The vibration generation module includes: a first piezoelectric vibration unit disposed in the first recess; and A second piezoelectric vibration unit is disposed in the second recess.

19. The plant according to claim 18, wherein: The first piezoelectric vibration unit generates sound vibration having a frequency bandwidth different from that of the second piezoelectric vibration unit.

20. The plant according to claim 19, wherein: Either one of the first piezoelectric vibration unit and the second piezoelectric vibration unit generates sound vibration corresponding to a frequency bandwidth of 1 kHz to 10 kHz, and The other of the first piezoelectric vibration unit and the second piezoelectric vibration unit generates sound vibration corresponding to a frequency bandwidth of 320 Hz to 1280 Hz.

21. The plant according to claim 11, wherein: The vibration generation module includes: piezoelectric element; and A housing surrounds a rear space of the piezoelectric element.

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