complete plant

Abstract

The present disclosure relates to a complete set of equipment, in particular, a display panel with a sound generation. The display device according to the present disclosure comprises: a display module; a back cover arranged at the rear surface of the display module; a recessed part recessed into the back cover from the first surface of the back cover with a first width and a first depth; a penetrating part penetrating to the recessed part from the second surface of the back cover 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 arranged at the stepped part between the penetrating part and the recessed part.

Description

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

[0002] This disclosure relates to a display device, and more particularly to a display panel that generates sound. Background Technology

[0003] Typically, display devices are screens used to display visual information, such as televisions, monitors, laptops, smartphones, tablets, electronic wearable devices, smartwatches, portable information devices, navigation systems or electronic products, vehicle control displays or home appliances.

[0004] Typical display devices may include a display panel for displaying video images and an audio device for providing sound related to the video images. However, conventional display devices have the limitation that sound quality is degraded due to interference between sound reflected from walls or floors, as sound from the audio device propagates towards the back or bottom of the display panel. Therefore, it is difficult to accurately deliver sound to the viewer, potentially compromising their immersion. Summary of the Invention

[0005] The inventors of this disclosure recognized the problems with the relevant display devices and conducted various experiments to improve sound quality and provide sound towards the front of the display panel when a viewer is viewing an image in front of the display panel. After numerous experiments, the inventors have provided a display device with a new structure that can generate sound that propagates towards the front of the display panel and improves sound quality.

[0006] One object of this disclosure is to provide a display device that accurately provides audible prompts. Another object of this disclosure is to provide a display device that generates a sound that propagates forward toward the display panel.

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

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

[0009] The display device according to this disclosure includes: a display module; a back cover disposed on the rear surface of the display module; a recessed portion recessed into the back cover from a first surface of the back cover with a first width and a first depth; a penetrating portion penetrating from a second surface of the back cover to the recessed portion with a second width and a second depth, the second width being less 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 penetrating portion and the recessed portion.

[0010] In one embodiment, the display device further includes an adhesive element that attaches the second surface of the back cover having a through portion to the display module.

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

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

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

[0014] In one embodiment, the first depth of the recess 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 to a portion of the rear surface of the display module exposed through a penetration.

[0016] In one embodiment, the display device further includes an upper recess that is recessed into the rear cover from a 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 the upper stepped portion between the upper recess and the penetrating portion.

[0018] In one embodiment, the first piezoelectric vibrating unit generates sound vibrations with a different frequency bandwidth than the second piezoelectric vibrating unit.

[0019] Additionally, the display device according to this disclosure includes: a display module including a display panel for displaying video images; a rear cover disposed on the rear surface of the display module; a first recess formed on the rear surface of the rear cover; a through hole penetrating the rear cover from the first recess to the upper surface of the rear cover; and a vibration generating module disposed in the first recess for providing sound vibrations to the rear cover via the through hole.

[0020] In one embodiment, the depth of the first recess is greater than that of the through hole.

[0021] In one embodiment, the depth of the first recess is less than that of the through hole.

[0022] In one embodiment, the vibration generation module includes: a piezoelectric element; and a metal substrate attached to one of the upper and lower surfaces of the piezoelectric element.

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

[0024] In one embodiment, the first recess includes: a first width; and a first depth less than the thickness of the back cover. The through-hole includes: a second width less than the first width; and a second depth corresponding to the difference between the thickness of the back cover and the first depth.

[0025] In one embodiment, the display device further includes a second recess formed on the upper surface of the back 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 generation module includes: a first piezoelectric vibration unit disposed in a first recess; and a second piezoelectric vibration unit disposed in a second recess.

[0027] In one embodiment, the first piezoelectric vibrating unit generates sound vibrations with a different frequency bandwidth than the second piezoelectric vibrating unit.

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

[0029] According to examples of this disclosure, a display device can be provided that accurately generates and transmits sound, improves sound quality, and increases the viewer's immersion. According to another example of this disclosure, a display device that generates sound in 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 within a back cover, a display device with a built-in sound generating device and an ultra-thin structure can be provided. Furthermore, by stacking and embedding sound generating devices of various frequency bands within the back cover, an ultra-thin display device that generates sound of various frequency bands can be provided.

[0030] In addition to the effects described above, other features and advantages of this disclosure may be described below, or may be clearly understood by those skilled in the art from the following description and explanation. Attached Figure Description

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

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

[0033] Figure 2 It is along Figure 1 The cross-sectional view taken along line I-I' shows the structure of a display device according to a first embodiment of the present disclosure.

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

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

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

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

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

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

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

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

[0043] Figure 12 This is an enlarged cross-sectional view showing the display structure according to the eleventh embodiment of the present disclosure. Detailed Implementation

[0044] Exemplary embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts. It should be noted in this specification that similar reference numerals already used to denote similar elements in other drawings will be used for elements whenever possible. In the following description, detailed descriptions of functions and configurations known to those skilled in the art that are not related to the basic configuration of this disclosure will be omitted. The terminology described in this specification should be understood as follows. The advantages and features of this disclosure and methods of implementation thereof will become clear from the following embodiments described with reference to the accompanying drawings. However, this disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0045] The shapes, dimensions, scales, angles, and quantities shown in the accompanying drawings to describe embodiments of this disclosure are merely examples, and therefore, this disclosure is not limited to the details shown. The same reference numerals will always refer to the same elements. In the following description, detailed descriptions of relevant known functions or configurations will be omitted if they are determined to unnecessarily obscure the focus of this disclosure.

[0046] When using the terms "comprising," "having," and "including" as described in this specification, another part may also exist unless "only" is used. Unless otherwise stated, singular terms may include plural terms.

[0047] When interpreting a component, although it is not explicitly described, it is interpreted as including an error region.

[0048] When describing positional relationships, for example, when the positional order is described as "above," "over," "below," and "beside," unless "adjacent" or "directly" is used, it may include cases where there is no contact between them. If it is mentioned that a first element is positioned "above" 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 an object can vary depending on the object's orientation. Therefore, in the drawing or in actual configuration, the case where the first element is positioned "above" the second element includes cases where the first element is positioned "below" the second element and cases where the first element is positioned "above" the second element.

[0049] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “next to,” and “before,” discontinuous cases may be included unless “immediately next” 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 used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

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

[0052] It should be understood that the term "at least one" includes all combinations relating to any one item. For example, "at least one of the first element, the second element, and the third element" may include all combinations of two or more elements selected from the first, second, and third elements, as well as each element 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 this disclosure may be partially or wholly linked or combined with each other, and may be interoperable and technically driven differently. Embodiments of this disclosure may be implemented independently of each other, or may be implemented together in an interdependent manner.

[0054] The term "display device" in this application may include a liquid crystal module (LCM), an organic light-emitting display module (OLED module), or a quantum dot module (QD module), having a display panel and a driver for driving the display panel. "Display device" may also include complete products or end products comprising an LCM, OLED module, or QD module, such as notebook computers, televisions, computer monitors, devices with other modules of automotive equipment or vehicles, and assemblies of electronic equipment or devices (or assemblies of equipment) such as smartphones or mobile electronic devices.

[0055] Therefore, "display device" can be any of the following: a display device such as an LCM, OLED module and QD module, an application device including an LCM, OLED module or QD module, or a complete set of equipment for an end user.

[0056] In another example, an LCM, OLED module, or QD module may be referred to as a "display device," and the final electronic device including the LCM, OLED module, or QD module may be referred to as an "equipment assembly." 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. An equipment assembly may include the display device and an assembly PCB or control PCB that drives the equipment assembly itself by connecting to the display device and the source PCB.

[0057] The display panel according to 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. Furthermore, the display panel applied to the display device according to embodiments of the present disclosure is not limited to the shape or size of the display panel.

[0058] When the display panel is a liquid crystal display panel, the display panel may include multiple gate lines, multiple data lines, and multiple pixels (or sub-pixels) defined by the gate lines and 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 color filters and / or a black substrate; and a liquid crystal layer disposed between the array substrate and the upper substrate.

[0059] When the display panel is an organic light-emitting diode (OLED) display panel, the display panel may include multiple gate lines, multiple data lines, and multiple pixels (or sub-pixels) defined by the gate lines and 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 protects the thin-film transistors and the organic light-emitting layer from any external impact and prevents moisture and oxygen from penetrating into the organic light-emitting layer. Alternatively, 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 micro-LED elements.

[0060] The display device including a sound generation module according to this disclosure can be used as a user interface module in vehicles, such as the central control panel in an automobile. For example, the display panel can be mounted in the central dashboard between the driver's seat and the front passenger seat, so that vibrations of the display panel are propagated toward the interior space of the vehicle. Therefore, the in-vehicle audio system can be improved compared to having conventional speakers 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 assigning reference numerals to elements in the various figures, identical components may be assigned the same reference numerals as much as possible, even if they are shown in different figures. For ease of description, the scales of the elements shown in the drawings are different from the actual scales and are not limited to the scales shown in the drawings.

[0062] Figure 1 This is a diagram illustrating a display device having a sound generation unit on the rear side according to the present disclosure. (Refer to...) Figure 1 According to the present disclosure, the display device can output sound or sound PVS based on the vibration of the display module 100 used to present image data. For example, in the display device, the sound generation unit 500 can cause the display module 100 to vibrate to output sound PVS. Most sound PVS generated by the vibration of the display module 100 can be output directly towards the front of the screen FD of the display device. According to the present disclosure, the display module 100 can be used as a diaphragm for generating sound PVS and outputting sound PVS towards the front of the screen FD of the display module 100. Therefore, sound can be accurately transmitted to the viewer, and sound quality can be improved and the viewer's immersion can be enhanced.

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

[0064] <First Implementation Method>

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

[0066] Reference Figure 2The display device according to a first embodiment of the present disclosure may include a display module 100, a back cover 700, and a sound generation unit 500. The sound generation unit 500 may be implemented as a piezoelectric vibrating unit PZ suitable for mounting within the back cover 700, which 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 in the sound generation unit 500.

[0067] The display module 100 may include a display panel 110, a functional diaphragm 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 generation unit 500 to directly output sound PVS to the forward FD, thereby the display panel 110 may be used as a speaker or diaphragm for directly generating sound PVS. For example, when the display module 100 functions as a sound PVS generator, the display module 100 may be a diaphragm, panel speaker, or flat panel speaker for directly generating sound PVS.

[0068] In one example, the display panel 110 may include pixel circuitry disposed on a substrate (or base substrate) and a pixel array layer (or display unit) connected to the pixel circuitry and having an anode, a cathode, and an organic light-emitting layer. The display panel 110 may display images in a top-emitting, bottom-emitting, or dual-emitting manner depending on the structure of the pixel array layer. The anode may be referred to as a first electrode or a pixel electrode, but is not limited to these terms. The cathode may be referred to as a second electrode or a common electrode, but is not limited to these terms.

[0069] The functional film 130 may include an anti-reflective layer (or anti-reflective film) for preventing ambient light reflection and improving the outdoor visibility and contrast of the image displayed on the display panel 110. For example, the anti-reflective layer may be a circularly polarizing layer (or circularly polarizing film) that prevents reflected light from being reflected by thin-film transistors and / or lines located at the pixel array layer of the display panel 110 to the viewer. 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 modulates the path of light emitted from the pixel array layer of the display panel 110 toward a viewer. The light path control layer may include a structure in which high-refractive-index layers and low-refractive-index layers are stacked alternately, thereby altering the path of light incident from the pixel array layer to minimize color shift depending on the viewing angle. In this case, the low-refractive-index layer may be disposed at the top 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 a user's touch. The touch electrode unit may be inserted between the display panel 110 and the functional membrane 130 or embedded in the in-touch display panel 110. For the in-touch example, the touch electrode unit may include mutual capacitance type or self capacitance type touch electrodes.

[0072] The heat diffusion element 150 may have a sheet shape attached to the entire rear surface of the display panel 110. The heat diffusion element 150 may be disposed on the rear surface of the display module 100 to overlap with the sound generation unit 500, so that heat generated when the sound generation unit 500 operates can diffuse toward the display module 100. Therefore, performance degradation of the sound generation unit 500 due to heat can be prevented. Additionally, the heat diffusion element 150 may have a size corresponding to the entire rear surface of the display panel 110 to diffuse the heat generated when the sound generation unit 500 operates to a wider area. Therefore, heat can be prevented from concentrating in the localized area of ​​the display module 100 overlapping with the sound generation unit 500, thereby minimizing or preventing localized brightness unevenness of the display module 100.

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

[0074] The rear cover 700 can be disposed on the rear surface of the display module 100. A sound generation unit 500 can be installed or fixed in the rear cover 700.

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

[0076] The rear cover 700 can 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, pressure-sensitive adhesive (PSA), optically clear adhesive (OCA), or optically clear resin (OCR). Attached to the entire rear surface of the display module 100, the rear cover 700 can be used to protect the rear surface of the display module 100 from any external impact and to dissipate heat generated from the display module 100.

[0077] In one example, the back cover 700 may have a plate shape that covers the entire rear surface of the display module 100 (i.e., the entire rear surface of the heat diffusion element 150). In some examples, the edge or corner portions of the back cover 700 may have a beveled or curved shape by chamfering or rounding processes.

[0078] In one example, the rear cover 700 may include a through-hole S1 or a recess S2. The through-hole S1 may be a through-hole penetrating the rear cover 700 from the front surface to the rear surface. The recess S2 may have a well shape in which some thickness of the rear cover 700 is removed to sink from the rear surface. The recess S2 and the through-hole S1 may be continuously formed into concentric circles such that the rear cover 700 may have a through-hole including the recess S2 and the through-hole S1.

[0079] The width of the penetrating portion S1 may be smaller than that of the recessed portion S2. In this case, a stepped portion TH may be formed between the penetrating portion S1 and the recessed portion S2. Here, the penetrating portion S1 and the recessed portion S2 may have the same depth, or one of them may have a greater depth than the other. Figure 2 This illustrates a case where the penetrating portion S1 has the same depth as the recessed portion S2.

[0080] The piezoelectric vibrating unit PZ can be installed within the recess S2. Specifically, using the adhesive element AH, the piezoelectric vibrating unit PZ can be fixed at the stepped portion TH. Figure 2 As shown, the piezoelectric vibration unit PZ can be installed inside the back cover 700 so that the overall thickness of the display device does not increase, thus maintaining the original thinness of the back cover.

[0081] Preferably, the sound generation unit 500 can 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, created by a penetrating portion S1, is provided between the piezoelectric vibrating unit PZ and the display panel 100. Vibrations generated from the piezoelectric vibrating unit PZ cause the air filling the space of the penetrating portion S1 to vibrate, which in turn causes the portion of the rear surface of the display module 100 corresponding to the penetrating portion S1 to vibrate. Therefore, sound PVS can be transmitted forward to FD.

[0082] In one example, the display device may include a sound generation module disposed at the central portion (or middle region) of the display module 100. Specifically, a sound generation module may cause the rear central portion of the display module 100 to vibrate, thereby providing sound PVS from the vibration of the display module 100.

[0083] In another example, the display device may include a first sound generating unit disposed at a first region (or left region) relative to a centerline of the rear surface of the display module 100, and a second sound generating unit disposed at a second region (or right region). Specifically, the first sound generating unit can cause the first rear region of the display module 100 to vibrate, thereby providing sound PVS through the vibration of the first region of the display module 100. The second sound generating unit can cause the second rear region of the display module 100 to vibrate, thereby providing sound PVS through the vibration of the second region of the display module 100. Therefore, the display device can output two-channel stereo sound by using the first and second sound generating units to separate the left and right sounds. In this case, the first sound generating unit can be configured to output left-ear sound, and the second sound generating unit can be configured to output right-ear sound.

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

[0085] In one example, at least one sound generation unit 500 may be a single structure or a single element modularized into a single component. Specifically, the sound generation unit 500 may be manufactured as a final product, such as a single structure or a single element, via a modular process (or assembly process) not included in the assembly process of the display device. Subsequently, during the assembly process of the display device, the sound generation unit 500 may be mounted at a stepped portion TH provided within the back cover 700 via a component mounting process. Therefore, this disclosure improves the assembly process of the sound generation unit 500 to the display device, thereby enhancing productivity.

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

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

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

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

[0090] The support element 310 can be attached to the rear cover 700 by inserting it into a groove formed in the side surface of the rear cover 700 of the display module 100. The front surface of the support element 310 can be combined with the surface of one side of the groove portion of the rear cover 700 using a guiding adhesive 3H. The support element 310 can have any thickness, but it is preferred that it is easy to engage with the rear cover 700 and has sufficient rigidity to prevent it from easily separating from the rear cover 700.

[0091] In one example, the support element 310 may have a single frame structure in a square shape, but is not limited to this. For example, the support element 310 may have multiple split strip shapes inserted into the edge of the back cover 700.

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

[0093] Sidewall 330 may be vertically connected to the outer surface of support element 310 parallel to the thickness direction Z of the display device. Sidewall 330 may surround both the outer surface (or outer wall) of display module 100 and the outer surface of rear cover 700. Therefore, sidewall 330 may protect the outer surface of each of display module 100 and rear cover 700 to improve the external design of the side surface of the display device. In one example, when support elements 310 are connected to each other to form a single unit, guide panel 300 may have a frame structure with a cross-sectional structure of “┣” shape.

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

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

[0096] According to the display device of this disclosure, the display panel 110 can be vibrated by a sound generating unit 500 disposed within a rear cover 700 bonded to the rear surface of the display module 100, and the sound PVS generated by the vibration can be output forward to the FD. Therefore, the immersive experience of the viewer when viewing video information on the display device can be improved.

[0097] Furthermore, according to the first embodiment of this disclosure, the display device can provide sound PVS from the vibration of the display panel 110, thus eliminating the need for an additional speaker. Therefore, the design of the assembly and the freedom of speaker placement can be improved.

[0098] Hereinafter, in various embodiments of this disclosure, the mounting structure of the sound generation unit 500, which is the core configuration of this disclosure, and in particular the piezoelectric vibration unit PZ in the rear cover 700 will be described in detail.

[0099] <Second Implementation Method>

[0100] Figure 3 This 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 An enlarged view of the portion indicated by circle A. The main configuration of the second embodiment will be described below. Figure 3 Configurations not shown in the diagram can be referenced. Figure 1 and Figure 2 .

[0101] Reference Figure 3 The display device according to the second embodiment of this 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 in the first embodiment, and therefore will not be described in detail again.

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

[0103] The penetrating portion S1 and the recessed portion S2 are connected to each other to have a structure that passes through the rear cover 700. However, the recessed portion S2 is not a structure for penetrating the rear cover 700, but rather a structure for mounting the piezoelectric vibration unit PZ within the rear cover 700. Therefore, the recessed portion S2 can be represented as a recessed portion, a sunken hole, or a sunken portion, but is not limited thereto. Conversely, the penetrating portion S1 can be formed to provide space for accurately or precisely transmitting the vibrations generated by the piezoelectric vibration unit PZ mounted at the recessed portion S2 to the rear surface of the display panel 100. Therefore, the penetrating portion S1 can 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 penetrating portion S1 and the recessed portion S2, a stepped structure can be formed between the front surface 700U and the rear surface 700B of the rear cover 700. For example, the penetrating 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 rear cover 700. The first depth may correspond to the recessed depth of the opening extending into the rear cover 700. For example, the first depth may correspond to the length of the sidewall 701 of the penetrating portion S1.

[0105] The recess S2 may correspond to the space provided between the intermediate surface 702 and the rear surface 700D, wherein the intermediate surface 702 may extend horizontally from the inner end of the side wall 701 of the penetrating portion S1 toward the rear cover 700. For example, the recess 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 recess depth of the opening of the recess S2 extending into the rear cover 700. For example, the second depth may correspond to the length of the side surface 703 of the recess S2.

[0106] Here, the second width of the opening of the recessed portion S2 is greater than the first width of the opening of the penetrating portion S1. The second depth of the recessed portion S2 is the same as the first depth of the penetrating portion S1. The penetrating portion S1 and the recessed portion S2 can be arranged such that their centers overlap each other to have a symmetrical shape, but are not limited thereto. Alternatively, the penetrating portion S1 can be set to be 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 represented 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 a crystal.

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

[0109] For example, the piezoelectric vibrator PE and the metal substrate SU can be made as one piece, and the outer periphery of the metal substrate SU can be attached to the intermediate surface 702 using an adhesive element AH.

[0110] When the piezoelectric vibrator PE generates vibration through electricity, the air in the penetration part S1 can vibrate through 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 metal substrate SU is thin, high-frequency sound can be generated, and when it is thick, low-frequency sound can be generated.

[0112] Furthermore, the vibrations generated by the piezoelectric vibrator PE can also 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, increasingly lower sound frequency vibrations can be generated. In some examples, different sound qualities can be represented by adjusting the volume and shape of the penetrating portion S1.

[0113] <Third Implementation Method>

[0114] Figure 4 This is an enlarged cross-sectional view showing the display structure according to the third embodiment of the present disclosure. Figure 4 yes Figure 1 An enlarged view of the portion indicated by circle A. The main components of the third embodiment will be described below. For Figure 4 For components not shown, please refer to Figures 1 to 3 .

[0115] Reference Figure 4 The display device according to the third embodiment of this 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 in the first embodiment, and therefore will not be described in detail again.

[0116] In a 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 the recess S2 and the penetration S1 formed within the 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 can be made as one piece, and the outer periphery of the metal substrate SU can be attached to the intermediate surface 702 using an adhesive element AH.

[0118] When the piezoelectric vibrator PE generates vibration through electricity, the air in the penetration portion S1 can vibrate, thereby generating sound pressure. This sound pressure can 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 can vibrate so that the sound vibration can be transmitted to the entire display panel 100.

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

[0120] <Fourth Implementation Method>

[0121] Figure 5 This is an enlarged cross-sectional view showing the display structure according to the fourth embodiment of the present disclosure. Figure 5 yes Figure 1 An enlarged view of the portion indicated by circle A. The main components of the fourth embodiment will be described below. For Figure 5 For components not shown, please refer to Figures 1 to 4 .

[0122] Reference Figure 5 The display device according to the fourth embodiment of this 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 in the above embodiment, and therefore will not be described in detail again.

[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 unit PZ according to the second and third embodiments.

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

[0125] The piezoelectric vibrator PE can be attached to the rear surface of the first metal substrate SU1. The piezoelectric vibrator PE can also 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 figures, the entire surface of the first metal substrate SU1 can have the same dimensions as the piezoelectric vibrator PE.

[0126] The second metal substrate SU2 can be attached to the rear surface of the piezoelectric vibrator PE. For example, the second metal substrate SU2 can cover the entire rear surface of the piezoelectric vibrator PE and be integrally formed with the piezoelectric vibrator PE.

[0127] In one example, the first metal substrate SU1, the piezoelectric vibrator PE, and the second metal substrate SU2 can be formed as a single unit, and the outer periphery of the first metal substrate SU1 can be attached to the intermediate surface 702 using an adhesive element.

[0128] When the piezoelectric vibrator PE generates vibration through electricity, the air in the penetration portion S1 can vibrate, thereby generating sound pressure. This sound pressure can 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 can vibrate, so that the sound vibration can be transmitted or propagated throughout 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 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 disposed on both surfaces of the piezoelectric vibrator PE, the heat generated from the piezoelectric vibrator PE can be radiated to the external environment more effectively through the penetration portion S1 and / or the recessed portion S2. That is, compared to the third embodiment, by providing another metal substrate, a higher quality sound can be obtained, and the heat dissipation effect is superior.

[0130] <Fifth Implementation Method>

[0131] Figure 6 This is an enlarged cross-sectional view showing the display structure according to the fifth embodiment of this disclosure. (See attached image.) Figure 6 The structure of the display device according to the fifth embodiment shown is very similar to the structure of the display device according to the first embodiment. The difference lies in that the volume of the penetrating portion S1 can be significantly smaller than the volume of the recessed portion S2. Figure 6 Conversely, even if not shown in the figure, the volume of the penetrating portion S1 can 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 vibrating unit PZ can be adjusted. For example, when the piezoelectric vibrating unit PZ is designed to generate high-frequency sound bands, the volume of the penetrating portion S1 can be made as small as possible. Conversely, when the piezoelectric vibrating unit PZ is designed to generate low-frequency sound bands, the volume of the penetrating portion S1 can be as large as possible.

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

[0134] In the above embodiments, various examples of the case where only one piezoelectric vibration unit PZ is provided in a sound generation unit 500 have been described. Hereinafter, various embodiments of the case where two piezoelectric vibration units PZ are provided in a sound generation unit 500 will be described.

[0135] <Sixth Implementation Method>

[0136] Figure 7 This is an enlarged cross-sectional view showing the display structure according to the sixth embodiment of the present disclosure. When necessary, the overall structure of the display device according to the present disclosure will be referenced. Figure 1 To describe.

[0137] Reference Figure 7 The display device according to the sixth embodiment of this disclosure may include a display module 100, a rear cover 700, and a sound generation unit 500. Preferably, the sound generation unit 500 may be implemented as a piezoelectric vibrating unit PZ adapted to be mounted within the rear cover 700 and coupled to the rear surface of the display module 100. For example, the sound generation 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 the embodiment described above, and will not be described again.

[0139] A rear cover 700 may be disposed on the rear surface of the display panel 100. A sound generation unit 500 may be mounted within the rear cover 700. For example, the rear 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, pressure-sensitive adhesive (PSA), optically clear adhesive (OCA), or optically clear resin (OCR). By attaching to the entire rear surface of the display module 100, the rear cover 700 protects the rear surface of the display module 100 from external impacts and radiates heat generated from the display module 100 to the external environment.

[0140] In one example, the rear cover 700 may include an upper recess Sa, a through-hole Sb, and a lower recess Sc. The upper recess Sa may have a first well shape in which a portion of the rear cover 700 is removed inward from the front surface by a first thickness. The lower recess Sc may have a second well shape in which the remaining portion of the rear cover 700 is removed inward from the rear surface by a second thickness. Furthermore, the through-hole Sb may have a through-hole penetrating the remaining rear cover 700 between the upper recess Sa and the lower recess Sc. Thus, in cross-section, the stepped portion 700C forming the through-hole Sb may have a protruding structure between the upper recess Sa and the lower recess Sc.

[0141] When the upper recess Sa, the through portion Sb, and the lower recess Sc are formed continuously, the through hole can be formed integrally. The width (or diameter) of the through portion Sb can be smaller than the width of the upper recess Sa or the lower recess Sc. Therefore, a first stepped portion TH1 can be formed between the upper recess Sa and the through portion Sb, and a second stepped portion TH2 can be formed between the lower recess Sc and the through portion Sb. Here, the depth of the through portion Sb can be the same as the depth of the upper recess Sa or the depth of the lower recess Sc. Otherwise, one of them can be larger than the others. Figure 7 In the middle, the upper recess Sa and the lower recess Sc have the same depth, and the depth of the penetrating part Sb is less than the depth of the upper recess Sa and the lower recess Sc.

[0142] The upper recess Sa, the penetrating portion Sb, and the lower recess Sc are continuously linked so that the back cover 700 is completely penetrated. However, the upper recess Sa and the lower recess Sc do not penetrate the back cover 700. The upper recess Sa is a structure for mounting the first piezoelectric vibration unit PZ1, and the lower recess Sc is a structure for mounting the second piezoelectric vibration unit PZ2. The penetrating portion Sb is a structure for preparing 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, based on the cross-sectional views of the upper recess Sa, the through portion Sb, and the lower recess 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 recess 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 recess Sa extending from the front surface 700U into the rear cover 700. For example, the first depth of the upper recess Sa may correspond to the length of the sidewall 7001 of the upper recess Sa.

[0144] The penetrating 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 to which the penetrating portion Sb penetrates the stepped portion 700C. For example, the second depth may correspond to the length of the sidewall 7003 of the penetrating portion Sb.

[0145] The lower recess 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 rear cover 700. The third depth may refer to the length of the opening of the lower recess Sc extending from the rear surface 700D into the rear cover 700. For example, the third depth of the lower recess Sc may correspond to the length of the sidewall 7005 of the upper recess Sa.

[0146] When the stepped portion 700C has an extrusion structure, the stepped portion 700C may have an upper surface 7002, a sidewall 7003 of the penetrating portion Sb, and a lower surface 7004. For example, the upper surface 7002 may be a plane that connects the lower side of the sidewall 7001 of the upper recess Sa to the upper side of the sidewall 7003 of the penetrating portion Sb. The lower surface 7004 may be a plane that connects the lower side of the sidewall 7003 of the penetrating portion Sb to the sidewall 7005 of the lower recess Sc.

[0147] Here, it means that the first width of the opening size of the upper recess Sa can be greater than the second width of the opening size of the penetrating portion Sb. Furthermore, it means that the first depth of the upper recess Sa can be greater than the second depth of the penetrating portion Sb. It means that the third width of the opening size of the lower recess Sc can be the same as the first width. Additionally, it means that the third depth of the lower recess Sc can be the same as the first depth.

[0148] The upper recess Sa, the penetrating portion Sb, and the lower recess Sc can be arranged such that their centers overlap to form a concentric shape, but are not limited thereto. Each center can be relatively offset and arranged to one side.

[0149] In a sixth embodiment, the sound generation 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 the upper surface 7002 of the stepped portion 700C disposed between the upper recess Sa and the through 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. In addition, 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 recessed portion Sc and the penetrating portion Sb. For example, using a second adhesive AH2, the second metal substrate SU2 may be attached to the lower surface 7004 of the stepped portion 700C. Additionally, 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 integrally, and the outer periphery of the first metal substrate SU1 may be attached to the upper surface 7002 of the stepped portion 700C using the first adhesive AH1. Furthermore, the second piezoelectric vibrator PE2 and the second metal substrate SU2 may be formed integrally, and the outer periphery of the second metal substrate SU2 may be attached to the lower surface 7004 of the stepped portion 700C using the second adhesive AH2.

[0153] When the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 generate vibration through electricity, the air in the upper recess Sa and the penetrating portion Sb can be vibrated through the first metal substrate SU1 and the second metal substrate SU2, thereby generating sound pressure. This sound pressure can be transmitted to the rear surface of the display panel 100, and some portions of the display panel 100 corresponding to the opening can vibrate so that the sound vibration can be transmitted or propagated throughout the entire display panel 100.

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

[0155] Furthermore, when the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 generate sound vibrations with the same phase within the same frequency bandwidth, a resonant effect that amplifies the volume can be achieved due to the symmetrical orientation of the first metal substrate SU1 and the second metal substrate SU2 towards each other. For example, the first piezoelectric vibrator PE1 and the second piezoelectric vibrator PE2 can be constructed from piezoelectric elements or electroactive materials, and the polarities of the driving voltages are opposite to each other. In this case, as... Figure 7 As shown, a resonance effect can be achieved, allowing the amplitude of sound vibrations to be multiplied due to the symmetrical arrangement of the structure. As a result, a two-way structure with increased amplitude and sound pressure level can be obtained.

[0156] By utilizing the structure of the sixth embodiment of this disclosure, rich sound quality with improved amplitude and sound pressure can be obtained in a thin-structure display device without the need to install speakers that are easily visible from the outside.

[0157] <Seventh Implementation Method>

[0158] Figure 8 This is an enlarged cross-sectional view showing the display structure according to the seventh embodiment of the present disclosure. Figure 8 The display device shown according to the seventh embodiment of this disclosure may have the same... Figure 7 The sixth embodiment shown has a very similar structure. The difference is that the first piezoelectric vibrator PE1 has different dimensions than 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 merely to illustrate size, but to illustrate the difference in the bandwidth of sound vibrations. For example, a smaller vibrator can generate sound vibrations in a higher frequency bandwidth than a larger vibrator. Figure 8 As shown, the first piezoelectric vibrator PE1 can be disposed in the upper recess Sa to generate high-frequency sound vibrations. The second piezoelectric vibrator PE2 can be disposed in the lower recess Sc to generate low-frequency sound vibrations.

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

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

[0162] <Eighth Implementation Method>

[0163] Figure 9 This is an enlarged cross-sectional view showing the display structure according to the eighth embodiment of the present disclosure. Figure 9 The display device shown according to the eighth embodiment of this disclosure may have the same... Figure 8 The seventh embodiment shown has a very similar structure. The difference is that the first piezoelectric vibrator PE1 is located at a different position than the second piezoelectric vibrator PE2 in the eighth embodiment.

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

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

[0166] Frequency bandwidth can refer to the pitch of a sound. The audible frequency range of 16 to 20,000 Hz can be divided into 10 octaves, and further subdivided into low, mid, and high frequency ranges. More specifically, it can be classified as follows.

[0167] [Table 1]

[0168]

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

[0170] When adjusting piezoelectric elements, it is preferable to prioritize the efficient transmission of high-frequency sound. In particular, the spatial design of the penetration section may be very important in order to maintain the sound pressure level of a 5kHz bandwidth sound.

[0171] For example, for the Figures 2 to 6In the first to fifth embodiments described, when the vibration generated from the piezoelectric vibrating unit PZ is reflected by the rear surface of the display panel 100, the space of the penetration portion S1 is crucial to ensure that the phase of the vibration of the piezoelectric vibrating unit PZ is not affected. To prevent phase change, as shown in Equation 1 below, the arrival time of the echo must be equal to or less than 1 / 2 of the period of the sound bandwidth. In the following equation, the maximum spatial separation distance unaffected by reverberation is calculated for a frequency of 5 kHz (the 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 a sound speed of 343 m / sec, the effective distance (i.e., the first depth) of the penetrating portion S1 can be "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 5 kHz sound, the depth of the penetrating portion S1 can have a value of 3.43 mm or less.

[0176] In the above embodiments, taking into account the frequency bandwidth generated from the piezoelectric vibrating unit to be applied, the depths of the recessed portion Sa and / or the penetrating portions Sb and S1 can be designed to provide high-quality sound without cancellation or loss.

[0177] <Ninth Implementation Method>

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

[0179] Figure 10 This illustrates the first embodiment of the present disclosure. Figure 2 The document also includes an enlarged cross-sectional view of an example of the HP heat sink metal plate. (See reference...) Figure 10 The display device according to the ninth embodiment of this disclosure may include a display module 100, a rear cover 700, a heat dissipation metal plate HP, and a sound generation unit 500. The display module 100, the rear cover 700, and the sound generation unit 500 may be selected from any of the above embodiments.

[0180] Alternatively, 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 through the penetration portion S1. Alternatively, the heat dissipation metal plate HP may be another portion of the rear surface of the display panel 100 exposed through the upper recess Sa. The heat dissipation metal plate HP may be attached to the adhesive element 600 applied to the rear surface of the display panel 100 to bond the rear 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 allows the heat generated by the piezoelectric vibration unit PZ to be easily discharged into the air without being directly transferred to the display panel 100.

[0182] <Tenth Implementation Method>

[0183] Figure 11 This is an enlarged cross-sectional view showing the display structure according to the tenth embodiment of the present disclosure. Figure 11 yes Figure 1 An enlarged view of the portion indicated by circle A. The main configuration of the tenth embodiment will be described below. Figure 11 Configurations not shown in the diagram can be referenced. Figures 1 to 10 .

[0184] Reference Figure 11 The display device according to the tenth embodiment of this disclosure may include a display module 100, a back cover 700, a piezoelectric vibration unit PZ, and a housing EN. The display module 100 may be the same as that in the first embodiment, and therefore will not be described in detail again.

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

[0186] In the tenth embodiment, a housing EN may also be included to seal the space where the recess S2 of the piezoelectric vibrating unit PZ is disposed. As in the previous embodiments, the recess S2 or the lower recess Sc may be configured to be in an open state. In this case, the sound waves generated by the vibration of the piezoelectric vibrating unit PZ can be output rearward from the rear cover 700, so that most of the sound may not be delivered to the front.

[0187] Preferably, the rear space of the open recess S2 is sealed to prevent sound loss to the rear and to concentrate the sound at the front FD. For this purpose, the housing EN may have a cover shape corresponding to the opening 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 in the figures, threads may be formed on the side 703 of the recess S2, and also 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 vibrating unit PZ generates vibration through electricity, the air in the penetrating portion S1 can vibrate, 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 throughout the entire display panel 100. Furthermore, when the housing EN seals the recess S2, which serves as the rear space of the piezoelectric vibrating unit PZ, the sound vibration reflected by the recess S2 can be reflected back to the front FD by the housing EN.

[0189] <Eleventh Implementation Method>

[0190] Figure 12 This is an enlarged cross-sectional view showing the display structure according to the eleventh embodiment of the present disclosure. Figure 12 yes Figure 1 An enlarged view of the portion indicated by circle A. The main configuration of the eleventh embodiment will be described below. Figure 12 Configurations not shown in the diagram can be referenced. Figures 1 to 11 .

[0191] Reference Figure 12 The display device according to the tenth embodiment of this 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 in the first embodiment, and therefore will not be described in detail again.

[0192] Unlike the previous embodiments, the eleventh embodiment features a piezoelectric vibration module PM. The piezoelectric vibration module PM may include a piezoelectric vibration unit PZ and a housing EN formed integrally.

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

[0194] The piezoelectric vibration module PM can be disposed at the intermediate surface 702 between the recess S2 and the through portion S1 formed in the back cover 700. For example, the piezoelectric vibration module PM can be attached to the intermediate surface 702 using an adhesive element AH.

[0195] The eleventh embodiment is characterized in that the piezoelectric vibrating unit PZ and the 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 have space suitable for the acoustic bandwidth of the piezoelectric vibrating unit PZ. Furthermore, by inserting the housing EN into the recess S2 and sealing it, the vibrating element can be easily mounted on the rear surface of the display panel. Additionally, even in the event of repair work, the damaged piezoelectric vibrating module PM can be easily removed, and a new piezoelectric vibrating module PM can be easily 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 disposed. 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 is prevented and the sound is focused on the front FD of the display device. The housing EN may have a thin container shape corresponding to the opening 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 in the figures, threads may be formed on the side 703 of the recess S2, and threads may also be formed on the outer side of the housing EN, so that the housing can close or open the recess S2 according to the interlocking structure of the threads.

[0198] The housing EN is described as a structure that perfectly seals the rear space of the piezoelectric vibrating unit PZ. However, it is not limited to this. In some cases, the housing EN may also include a resonant aperture of predetermined dimensions. In these cases, the housing EN may have a structure surrounding the rear space of the piezoelectric vibrating unit PZ without sealing it.

[0199] When the piezoelectric vibrating unit PZ generates vibration through electricity, the air in the penetrating portion S1 can vibrate, 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 throughout the entire display panel 100. Furthermore, when the housing EN seals the recess S2, which serves as the rear space of the piezoelectric vibrating unit PZ, the sound vibration reflected by the recess S2 can be reflected back to the front FD by the housing EN.

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

[0201] The features, structures, effects, etc., described in the above examples of this disclosure are included in at least one example of this disclosure, and are not necessarily limited to one example. Furthermore, those skilled in the art can combine or modify other examples to implement the features, structures, effects, etc., exemplified in at least one example of this disclosure. Therefore, content relating to these combinations and modifications should be interpreted as including within the scope of this application.

[0202] It will be apparent to those skilled in the art that various modifications and variations can be made to this disclosure without departing from its spirit or scope. Therefore, this disclosure is intended to cover such modifications and variations as long as they fall within the scope of the appended claims and their equivalents. These and other changes can be made to the embodiments based on the foregoing description. Generally, the terminology used in the following claims should not be construed as limiting the claims to the specific embodiments disclosed in the specification and claims, but should be interpreted to include all possible embodiments and the full scope of the equivalents to which these claims are entitled. Therefore, the claims are not limited by this disclosure.

Claims

1. A complete set of equipment, comprising: Vibrating plate; Rear cover, located on the rear surface of the vibrating plate; A recessed portion that is recessed from the first surface of the rear cover; A penetrating portion that penetrates from the second surface of the rear cover to the recess; A sound generation unit is disposed at the stepped portion between the penetrating portion and the recessed portion; as well as The housing is located within the recess at the rear surface of the sound generating unit. The sound generation unit is disposed in the space from the first surface of the back cover to the second surface of the back cover, the space corresponding to the thickness of the back cover and the sum of the depth of the recess and the depth of the penetrating portion.

2. The complete set of equipment according to claim 1, wherein, The outer casing covers the rear space of the sound generating unit in the recess, or The outer casing seals the rear space of the sound generating unit within the recess.

3. The complete set of equipment according to claim 1, wherein, The outer shell comprises an elastic material and is inserted into the recess.

4. The complete set of equipment according to claim 1, wherein, The outer casing includes a cover shape corresponding to the opening area of ​​the recess.

5. The complete set of equipment according to claim 1, wherein, The sound generation unit includes: A metal substrate, which is attached to the stepped portion; and A piezoelectric vibrator is attached to the rear surface of the metal substrate.

6. The complete set of equipment according to claim 5, wherein, The sound generation unit also includes a second metal attached to the rear surface of the piezoelectric vibrator.

7. The complete set of equipment according to claim 1, wherein, The sound generation unit includes: A piezoelectric vibrator, which is attached to the stepped portion; and A metal substrate is attached to the rear surface of the piezoelectric vibrator.

8. A complete set of equipment, comprising: Vibrating plate; Rear cover, located on the rear surface of the vibrating plate; A recessed portion that is recessed from the first surface of the rear cover; A penetrating portion that penetrates from the second surface of the rear cover to the recess; as well as A sound generation unit is disposed at the stepped portion between the penetrating portion and the recessed portion; and The sound generating unit includes a housing disposed in the recess and a piezoelectric vibration unit disposed on the housing. The piezoelectric vibration unit is disposed in the space from the first surface of the back cover to the second surface of the back cover, the space corresponding to the thickness of the back cover and the sum of the depth of the recess and the depth of the penetration.

9. The complete set of equipment according to claim 8, wherein, The outer shell and the piezoelectric vibration unit are implemented as a single module.

10. The complete set of equipment according to claim 8, wherein, The outer shell is attached to the stepped portion in the recess and surrounds the piezoelectric vibrating unit.

11. The complete set of equipment according to claim 10, wherein, The housing also includes holes of a predetermined size.

12. The complete set of equipment according to claim 8, wherein, The housing seals the rear space of the piezoelectric vibration unit within the recess.

13. The complete set of equipment according to claim 8, wherein, The outer shell comprises an elastic material and is attached to the stepped portion in the recess.

14. The complete set of equipment according to claim 8, wherein, The piezoelectric vibration unit includes: A metal substrate, which is attached to the housing; and A piezoelectric vibrator is attached to the rear surface of the metal substrate.

15. The complete set of equipment according to claim 14, wherein, The piezoelectric vibration unit also includes a second metal attached to the rear surface of the piezoelectric vibrator.

16. The complete set of equipment according to claim 8, wherein, The piezoelectric vibration unit includes: A piezoelectric vibrator, which is attached to the housing; and A metal substrate is attached to the rear surface of the piezoelectric vibrator.

17. The complete set of equipment according to any one of claims 1 to 16, in, The recess includes a first volume, and The penetrating portion includes a second volume, which corresponds to the difference between the volume of the back cover and the first volume.

18. The complete set of equipment according to claim 17, wherein, The first volume of the recess is larger than the second volume of the penetrating portion.

19. The complete set of equipment according to any one of claims 1 to 16, in, The recess includes a first width and a first depth; and The penetrating portion includes 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.

20. The complete set of equipment according to claim 19, wherein, The second depth of the penetrating portion is less than half the thickness of the back cover, or Wherein, the first depth of the recessed portion is greater than the second depth of the penetrating portion.

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