Display device

Abstract

To provide a display device that improves a user's viewing immersion feeling.SOLUTION: A display device according to some examples of the present specification includes a display unit that includes a display panel displaying a video, and a curvature variable device that changes the curvature of the display unit. The curvature variable device includes an arc member that is arranged in a back area of the display unit parallel to a first direction, a support plate that is arranged in the back area of the display unit, a rotating driving section that is arranged on the support plate, a linear driving section that is arranged on the support plate and makes a linear motion through the rotation of the rotating driving section along a second direction intersecting with the first direction, a rotation linking section that is linked to the center portion of the arc member on the support plate and makes a rotary motion through the linear motion of the linear driving section to rotate the center portion of the arc member, and a holder section that rotatably supports the center portion of the arc member on the support plate.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006] , , , , , ,

[0001] This specification relates to a display device, and more particularly to a curved display device.

Background Art

[0002] As the information society develops, the requirements for display devices for displaying images are increasing in various forms. Recently, with the display screen of the display device having a flat form and being enlarged, there is a problem that the deviation between the viewing distance for the central region of the screen and the viewing distances for the regions on both sides of the screen becomes large.

[0003] In order to improve such a deviation in viewing distance and maximize the user's immersive viewing experience, a curved display device in which a flat display panel is curved at a constant curvature has been proposed. In a conventional curved display device, since the display panel maintains a state of being curved at a constant curvature, the curvature of the display panel cannot be changed according to the selection (or preference) of the user (or viewer).

[0004] Also, in a conventional curved display device, since the sound output from the sound device for outputting sound related to the video travels behind or below the display panel, the sound quality deteriorates due to the interference between the sounds reflected from the wall or the floor, and thus there is a problem that accurate sound transmission is difficult, and the immersive feeling of the viewer may decrease.

[0005] Therefore, although a conventional curved display device can maximize the user's immersive viewing experience through a screen curved at a constant curvature, accurate sound transmission is difficult, and the user's auditory immersive feeling may decrease.

Prior Art Documents

Patent Documents

[0006] [[ID=...]] [[ID=...]]

Patent Document 1

[0007] The inventors of this application recognized the problems of conventional curved display devices and conducted several experiments on a display device in which the curvature of the display panel (or unit) can be changed, and a display device in which sound can be output in front of the display panel by making the curvature of the display panel variable, thereby maximizing the viewer's (or audience's) immersion in viewing. Through these experiments, they invented a display device with a new structure that allows for variable curvature of the display panel, and a display device with a new structure that can maximize the viewer's immersion in viewing.

[0008] The problem that this specification aims to solve is to provide a display device that can maintain a planar shape for the display panel or make the display panel variable in terms of curvature.

[0009] Another problem that this specification seeks to solve is to provide a display device that can maximize the user's (or viewer's) viewing immersion.

[0010] The problems that the examples in this specification aim to solve are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those with ordinary skill in the art to which the technical concept of this specification pertains, based on the following description. [Means for solving the problem]

[0011] Some examples of display devices according to this specification include a display unit including a display panel for displaying images, a back cover disposed on the back of the display panel, and a curvature variable device disposed on the back cover for changing the curvature of the display unit, the curvature variable device including an arc member disposed in the back region of the display unit parallel to a first direction, a support plate disposed in the back region of the display unit, a rotary drive unit disposed on the support plate, a linear drive unit disposed on the support plate and moving linearly along a second direction intersecting the first direction by the rotation of the rotary drive unit, a rotary link unit coupled to the central portion of the arc member on the support plate and rotating by the linear motion of the linear drive unit to rotate the central portion of the arc member, and a holder unit that rotatably supports the central portion of the arc member on the support plate.

[0012] Some examples of display devices according to this specification include a display unit and a variable curvature device positioned on the back of the display unit for changing the curvature of the display unit, the display unit including a display panel for displaying an image, a back cover positioned on the back of the display panel for supporting the variable curvature device, and a groove formed recessed from the back cover superimposed on the variable curvature device for housing the variable curvature device.

[0013] Specific details relating to various examples in this specification other than the means of solving the problems mentioned above are included in the following descriptions and figures. [Effects of the Invention]

[0014] Display devices according to some examples of this specification can maintain the display panel in a planar form or deform the display panel with various curvatures.

[0015] Some examples of display devices described herein allow for variable curvature of the display panel and output of sound in front of the display panel, thereby simultaneously maximizing the user's (or viewer's) immersion in viewing.

[0016] The contents of the problems to be solved, the means for solving the problems, and the effects mentioned above do not specify the essential features of the claims, and the scope of rights of the claims is not limited by the matters described in the content of the invention.

Brief Description of the Drawings

[0017] [Figure 1] It is a front perspective view showing a display device according to an embodiment of the present specification. [Figure 2] It is a plan view showing a display device according to an embodiment of the present specification. [Figure 3] It is a side view showing a planar form and a curved surface form of a display device according to an embodiment of the present specification. [Figure 4] It is a rear view of a display device according to an embodiment of the present specification. [Figure 5] It is an exploded perspective view of a display device according to an embodiment of the present specification. [Figure 6] It is a view showing a curvature variable device and a vibration device arranged on the back surface of the display device shown in FIG. 5. [Figure 7] It is a cross-sectional view of the line I-I' shown in FIG. 5. [Figure 8] It is a cross-sectional view of the line II-II' shown in FIG. 6. [Figure 9] It is an enlarged view of the "B1" part shown in FIG. 6. [Figure 10] It is an enlarged view of the "B2" part shown in FIG. 6. [Figure 11] It is an enlarged view of the "B3" part shown in FIG. 6. [Figure 12A] It is a cross-sectional view showing a planar form of a display device according to the present specification. [Figure 12B] It is a cross-sectional view showing a curvature variable state of a display device according to the present specification. [Figure 13] It is a view for explaining a position adjustment device in a display device according to an embodiment of the present specification. [Figure 14] It is an exploded perspective view showing a display device according to another example of the present specification. [Figure 15] This figure shows the variable curvature device and vibration device located on the back of the display unit shown in Figure 14. [Figure 16] This is a cross-sectional view along the line III-III' shown in Figure 14. [Figure 17] This is an exploded perspective view showing another example of a display device relating to this specification. [Figure 18] This is a cross-sectional view along the line IV-IV' shown in Figure 17. [Figure 19] This is an exploded perspective view showing another example of a display device relating to this specification. [Figure 20] This is a cross-sectional view along the line V-V' shown in Figure 19. [Figure 21] This figure shows a vibration generator according to one embodiment of this specification. [Figure 22] This figure shows a vibration generator relating to another example in this specification. [Figure 23] This figure shows another example of a vibration generator as described herein. [Figure 24] This figure shows another example of a vibration generator as described herein. [Figure 25] This figure shows a vibration generating unit according to yet another example of this specification. [Figure 26] This is a cross-sectional view of the line VI-VI' shown in Figure 25. [Figure 27] This figure shows a modified example of a variable curvature device in the display device according to this specification. [Modes for carrying out the invention]

[0018] The advantages and features of this specification, and how they are achieved, will become clearer by referring to an example described in detail below with accompanying figures. However, this specification is not limited to the embodiments disclosed below, but can be realized in a variety of different forms, and these embodiments are provided merely to complete the disclosure of this specification and to fully inform those who are ordinary skill in the art to which this specification belongs of the scope of the invention, and this specification is defined solely by the scope of the claims.

[0019] For illustrative purposes, the shapes, sizes, proportions, angles, and quantities shown in the figures are illustrative and not limiting to what is shown in the figures. Throughout this specification, the same reference numerals refer to the same components. Furthermore, in describing this specification, if it is determined that a specific explanation of the relevant prior art would unnecessarily obscure the gist of the invention, such detailed explanation will be omitted.

[0020] Wherever "includes," "has," "consists of," etc., as used herein, other parts may be added unless "from only" is used. Unless otherwise explicitly stated, this includes cases where a singular component is included.

[0021] When interpreting the constituent elements, it shall be assumed that a margin of error is included, even if not explicitly stated otherwise.

[0022] When describing a spatial relationship, for example, if the relationship between two parts is described using phrases like "above," "above the top," "below the bottom," or "beside the side," then one or more other parts can be located between the two parts unless "immediately" or "directly" is used.

[0023] When describing a temporal relationship, for example, if the temporal sequence is described using phrases like "after," "following," "next," or "before," then, unless "immediately" or "directly" is used, it can include cases that are not continuous.

[0024] While terms such as "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are simply used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical concept of the present invention.

[0025] The term "at least one" should be understood to include all possible combinations of one or more related items. For example, "at least one of item 1, item 2, and item 3" may mean not just item 1, item 2, or item 3 individually, but all possible combinations of items that can be presented by two or more of items from item 1, item 2, and item 3.

[0026] The technical features of some of the examples herein can be combined or combined with each other, either partially or whole, enabling a variety of technical interdependencies and drives, and each example can be implemented independently of the others or together in relation to each other.

[0027] Hereinafter, an example of a display device according to the embodiments of this specification will be described in detail with reference to the attached figures. In assigning reference numerals to the components in each figure, the same component may be given the same reference numeral as much as possible, even if it is shown in other figures. Furthermore, the scale of the components shown in the attached figures is different from the actual scale for the sake of explanation, and is not limited to the scale shown in the figures.

[0028] Figure 1 is a front perspective view showing a display device according to one embodiment of this specification, Figure 2 is a plan view showing a display device according to one embodiment of this specification, and Figure 3 is a side view showing the plan and curved shapes of the display device according to one embodiment of this specification.

[0029] Referring to Figures 1 to 3, a display device according to one embodiment of this specification may include a display unit 100 implemented to display an image, and a variable curvature device that deforms the display unit 100 into a planar form (or planar mode) or a curved form (or curved mode) in response to a user's selection (or operation).

[0030] The display unit 100 can be mounted upright on a stand 300 or a wall-mounting bracket. For example, the stand 300 or wall-mounting bracket can be connected (or coupled) to the back or curvature variable device of the display unit 100. Additionally, while mounted on the stand 300 or wall-mounting bracket, the display unit 100 can be tilted in the front-to-back (or front-to-back) direction or moved up and down.

[0031] A display unit 100 according to one embodiment of this specification can be transformed into a planar or curved shape by driving a curvature variable device based on the user's operation on a curvature variable button unit (CVB) located on a stand 300. For example, when the display unit 100 is in a planar shape with a curvature of 0 (zero) (R0) (or first curvature), the curvature variable device can transform the display unit 100 into a curved shape with a curvature greater than 0 (zero) (R1) (or second curvature) in response to the user's operation on a first button switch (BS1) of the curvature variable button unit (CVB). Here, the curvature variable device can progressively change the curvature of the display unit 100 depending on the operation time (or holding time) of the first button switch (BS1), or it can bend (or change) the display unit 100 to a preset curvature (R1) from among various curvatures with a single operation (or single press) of the first button switch (BS1). Conversely, when the display unit 100 is a curved surface having a curvature (R1) greater than 0 (zero), the curvature variable device can deform the display unit 100 to a planar shape having a curvature (R0) of 0 (zero) in response to the user's operation of the second button switch (BS2) of the curvature variable button section (CVB), or return it to its original state.

[0032] Other examples of the display unit 100 described herein can be transformed into a planar or curved form by driving a curvature variable device based on user operation to a remote controller (RC) supporting a short-range wireless interface. For example, when the display unit 100 is in a planar form with a curvature of 0 (zero) (R0), the curvature variable device can progressively change the curvature of the display unit 100 based on the operation time (or duration of pressing) of a first button (BS1) of the remote controller (RC), or can be bent (or transformed) the display unit 100 to a preset curvature (R1) with a single operation (or single press) of the first button (BS1). Conversely, when the display unit 100 is in a curved form with a curvature (R1) greater than 0 (zero), the curvature variable device can be transformed to a planar form with a curvature of 0 (zero) (R0) or returned to a planar form in response to user operation to a second button (BS2) of the remote controller (RC).

[0033] In one embodiment of this specification, the display unit 100 can also function as a diaphragm that displays images and, when not displaying images, outputs sound (PVS) forward (FD). Therefore, the display device according to one embodiment of this specification may further include a vibration device 500 located on the back of the display unit 100.

[0034] The vibration device (or vibration device) 500 can be implemented by using the display unit 100 as a diaphragm so that the sound (PVS) generated by the vibration of the display unit 100 is output to the front (FD) of the display unit. For example, the vibration device 500 can generate sound (PVS) (or vibratory sound of the panel) by vibrating the display panel 110 of the display unit 100 in response to an acoustic signal (or voice signal), thereby causing the vibration of the display panel 110 (or the panel itself). For example, the vibration device 500 can directly vibrate the display panel 110.

[0035] A vibration device 500 according to one embodiment of this specification may be positioned in the first vibration region and the second vibration region of the display unit 100. The display unit 100 can achieve stereo sound by outputting the first sound (or left sound) and the second sound (or right sound) generated by the vibration of the first vibration region and the second vibration region, respectively, forward (FD). For example, the vibration device 500 can directly vibrate the first vibration region and the second vibration region of the display panel 110.

[0036] An embodiment of the display device according to this specification may further include a rear curtain device 400 implemented on the back of the display unit 100 so as to cover the variable curvature device.

[0037] The rear curtain device 400 deforms to accommodate the curvature change of the display unit 100 due to the operation of the curvature variable device, thereby preventing mechanisms and other components located on the rear of the display unit 100 from being exposed to the outside on the side. Such a rear curtain device 400 will be described later.

[0038] As described above, the display device according to one embodiment of this specification can provide a display unit 100 (or display screen) that can be transformed into a planar or curved form according to the user's (or viewer's) choice (or preference), and can maximize the viewer's immersion in viewing through the curved display unit 100 (or display screen). Furthermore, the display device according to one embodiment of this specification can provide the viewer with accurate and improved sound quality (PVS) without loss or distortion by outputting sound towards the front (FD) (viewer's face) of the display unit 100 through vibration of the display unit 100, thereby providing a display device that can enhance the viewer's auditory immersion. Furthermore, the display device according to one embodiment of this specification outputs sound toward the front (FD) (viewer's face) of the display device 100 (or display screen) by vibration of the curved display device 100, thereby preventing or minimizing the sense of incongruity (or disharmony) caused by the distance difference between the image and sound, and providing the viewer with accurate and improved sound quality (PVS) without loss or distortion, thereby maximizing the user's (viewer's) sense of immersion in viewing.

[0039] Figure 4 is a rear view of a display device according to one embodiment of this specification, Figure 5 is an exploded perspective view of a display device according to one embodiment of this specification, Figure 6 shows a variable curvature device and a vibration device located on the rear of the display device shown in Figure 5, and Figure 7 is a cross-sectional view taken along the line I-I' shown in Figure 5.

[0040] Referring to Figures 4 to 7, one embodiment of the display device according to this specification may include a display unit 100, a variable curvature device 200, and a stand 300.

[0041] The display unit 100 is the screen of a display device and can display images. For example, the display unit 100 can display images through a plurality of pixels having self-emissive display elements. Additionally, the display unit 100 can function as a touch sensor that senses the user's touch.

[0042] As shown in Figure 7, a display unit 100 according to one embodiment of this specification may include a display panel 110 and a back cover 120.

[0043] The display panel 110 may include a bendable self-emissive display panel or a curved self-emissive display panel. For example, the display panel 110 may include, but is not limited to, a light-emitting display panel, a micro-light-emitting diode display panel, a flexible light-emitting display panel, a flexible micro-light-emitting diode display panel, or a quantum dot light-emitting display panel.

[0044] A display panel 110 according to one embodiment of this specification may include a pixel array layer having a plurality of pixels, disposed on a base substrate, and an encapsulation member covering the pixel array layer.

[0045] Each of the multiple pixels may include a light-emitting layer. The light-emitting layer can be implemented as an upper light-emitting structure (or front light-emitting structure) that emits light to the outside through a sealing member, or as a lower light-emitting structure (or back light-emitting structure) that emits light to the outside through a base substrate. In this specification, the light-emitting layer will be described assuming that it is implemented as an upper light-emitting structure.

[0046] The sealing member can be implemented to cover the pixel array layer and may include the function of protecting the light-emitting element layer from oxygen and / or moisture. For example, the sealing member provided by the upper light-emitting structure may be transparent, while the sealing member provided by the lower light-emitting structure may be opaque.

[0047] A display panel 110 according to one embodiment of this specification may further include a touch sensor layer (or touch electrode layer) for detecting the user's touch position. When the light-emitting element layer is an upper light-emitting structure, the touch sensor layer may be disposed on a sealing member. When the light-emitting element layer is a lower light-emitting structure, the touch sensor layer may be disposed on a base substrate.

[0048] The back cover 120 can be used to realize the rear structure of the display unit 100. By being positioned on the back of the display panel 110, the back cover 120 can cover or support the back of the display panel 110.

[0049] The back cover 120 according to one embodiment of this specification may include a metallic material or a metallic alloy material. For example, the back cover 120 may have, but is not limited to, any of the following materials: aluminum, aluminum alloy, magnesium alloy, iron-nickel alloy, and stainless steel, or an alloy thereof, or a joint structure.

[0050] A back cover 120 according to one embodiment of this specification may be connected (or joined) to the back of the display panel 110 via a cover connecting member 130.

[0051] The cover connecting member 130 is interposed between the back cover 120 and the back of the display panel 110, thereby creating an air gap (AG) between the back cover 120 and the back of the display panel 110.

[0052] The cover connecting member 130 according to one embodiment of this specification may be an adhesive resin, double-sided tape, or a double-sided adhesive foam pad, and may be elastic for shock absorption.

[0053] The cover connecting member 130 according to one embodiment of this specification may include a magnet. For example, the cover connecting member 130 may be, but is not limited to, a rubber magnet.

[0054] In one embodiment of this specification, the cover connecting member 130 may be positioned along the rear edge of the display panel 110 and the front edge of the back cover 120. For example, the air gap (AG) between the back cover 120 and the rear of the display panel 110 may be the area or space enclosed by the cover connecting member 130.

[0055] The display unit 100 according to one embodiment of this specification may further include a middle frame 140.

[0056] The middle frame 140 may be positioned between the rear edge of the display panel 110 and the front edge of the back cover 120. By enclosing both the outer surface (or outer wall) of the display panel 110 and the outer surface (or outer wall) of the back cover 120, the middle frame 140 protects the outer surfaces of both the display panel 110 and the back cover 120, thereby improving the exterior design of the display device's sides. For example, the middle frame 140 may be referred to as a middle cabinet, middle cover, or middle chassis, but is not limited to these terms.

[0057] An embodiment of the middle frame 140 according to this specification may include support portions that support the respective edge portions of the display panel 110 and the back cover 120, and side wall portions that surround the respective sides of the display panel 110 and the back cover 120. For example, the middle frame 140 may have a frame structure having a "├" or "┤" shaped cross-sectional structure that forms a single body with the support portions and the side wall portions.

[0058] In one embodiment of the middle frame 140 according to this specification, the first surface of the support portion may be bonded to the rear edge portion of the display panel 110 via an adhesive member, and the second surface of the support portion may be bonded to the front edge portion of the back cover 120 via an adhesive member.

[0059] In one embodiment of the middle frame 140 according to this specification, the first surface of the support portion is separated from the rear edge portion of the display panel 110, and the second surface of the support portion can be joined to the front edge portion of the back cover 120 via an adhesive member.

[0060] The middle frame 140 according to one embodiment of this specification may be made of a metal or plastic material. For example, the middle frame 140 may be made of a metal material to improve the side appearance design of the display device and protect the sides of the display device, but is not necessarily limited to a metal material.

[0061] The curvature variable device 200 (or curvature variable unit) is located on the back of the display unit 100 and can change the curvature of the display unit 100. For example, the curvature variable device 200 may be located on the back of the back cover 120.

[0062] The curvature-adjustable device 200, in response to user (or viewer) operation, moves (or advances) both sides of the display unit 100 toward the front (FD) of the display unit, thereby causing both sides of the display unit 100 to protrude further toward the front (FD) of the display unit than the central part. As a result, the display unit 100 can be transformed into a curved shape with a curvature greater than 0 (zero) by having both sides protrude further toward the front (FD) of the display unit than the central part. For example, when a viewer positioned in front of the display unit views the curved display unit 100, the central part can bend concavely from both sides, creating a curved shape. Such a curved display unit 100 can provide the user with a more three-dimensional and immersive image. For example, the curved display unit 100 can be realized when a single user, rather than multiple users, is viewing the image, but it is not necessarily limited to this.

[0063] The curvature-adjustable device 200, in response to user input, moves (or reverses) both sides of the display unit 100, which protrude forward (FD) of the display unit, toward the rear (RD) of the display unit, thereby returning both sides of the display unit 100 to the same plane as the central part. As a result, the display unit 100 can be transformed into a planar shape with zero curvature, with both sides and the central part positioned on the same plane. Such a planar shape of the display unit 100 can be realized when multiple users, not just one user, are viewing images, but is not necessarily limited to this.

[0064] An embodiment of the variable curvature device 200 according to this specification may include an arc member 210, a drive unit 220, and a guide 230.

[0065] The arc member 210 may be positioned on the back of the display unit 100. For example, the arc member 210 may be positioned on the back of the back cover 120.

[0066] An arc member 210 according to one embodiment of this specification may have a curved shape. For example, the arc member 210 can be described as a curvature variation member or curvature changing member, a curvature variation rod, a curvature variation bar, or a curvature variation pipe, and is not limited to these terms.

[0067] The arc member 210 rotates when driven by the drive unit 220, allowing both sides of the display unit 100 to move forward (FD) or backward (RD) of the display device. For example, the arc member 210 can rotate up to 90 degrees in a first rotational direction or up to 90 degrees in a second rotational direction opposite to the first rotational direction when driven by the drive unit 220. Here, the first rotational direction can be forward or clockwise rotation, and the second rotational direction can be reverse or counterclockwise rotation, but is not limited to these, and can be the other way around. For example, the display unit 100 can be deformed into a curved surface shape with a curvature greater than 0 (zero) when the arc member 210 rotates in the first rotational direction, and when the arc member 210 is rotated in the first rotational direction, it can be deformed into a curved surface shape with a curvature of 0 (zero) or returned to that state when rotated in the second rotational direction.

[0068] An arc member 210 according to one embodiment of this specification may include a first arc member 211 and a second arc member 213.

[0069] The first arc member 211 may be positioned in the first rear region (RA1) of the display unit 100 parallel to the first direction (X). For example, the first arc member 211 may be positioned in the first rear region (RA1) of the back cover 120. The first rear region (RA1) may be the upper rear region adjacent to the first long side of the back of the display unit 100, with respect to the upright state or the second direction (Y). For example, the first rear region (RA1) of the back cover 120 may be between the intermediate rear region and the first long side of the display unit 100 parallel to the first direction (X).

[0070] The first arc member 211 may have a curved shape. The first arc member 211 may have a curved shape that is convex to the first long side of the display unit 100. The center (or length center) of the first arc member 211 may be adjacent to the first long side of the display unit 100, and both ends (or both sides) of the first arc member 211 may be adjacent to the vertical midline (VCL) of the display unit 100. For example, in a view of the back of the display unit 100 having a curvature of 0 (zero), one end (or first end) of the first arc member 211 may be adjacent to the vertical midline (VCL) of the first short side (or first back edge) of the display unit 100, and the other end (or second end) of the first arc member 211 may be adjacent to the vertical midline (VCL) of the second short side (or second back edge) of the display unit 100.

[0071] The second arc member 213 may be positioned in the second rear region (RA2) of the display unit 100 parallel to the first direction (X). The second arc member 213 may be positioned in the second rear region (RA2) of the back cover 120. The second rear region (RA2) may be the lower rear region adjacent to the second long side of the back of the display unit 100, with respect to the upright state or the second direction (Y). The second rear region (RA2) of the back cover 120 may be between the second long side and the intermediate rear region of the display unit 100.

[0072] The second arc member 213 may have a curved shape. The second arc member 213 may have a curved shape that is convex toward the second long side of the display unit 100. The center (or length center) of the second arc member 213 may be adjacent to the second long side of the display unit 100, and both ends (or both sides) of the second arc member 213 may be adjacent to the vertical midline (VCL) of the display unit 100. For example, in a view of the back of the display unit 100 having a curvature of 0 (zero), one end (or first end) of the second arc member 213 may be adjacent to the vertical midline (VCL) of the first short side (or first back edge) of the display unit 100, and the other end (or second end) of the second arc member 213 may be adjacent to the vertical midline (VCL) of the second short side (or second back edge) of the display unit 100.

[0073] The first arc member 211 and the second arc member 213 may be positioned on the back of the display unit 100 so as to be symmetrical to each other with respect to the back intermediate region or vertical intermediate line (VCL) of the display unit 100. Here, the vertical intermediate line (VCL) of the display unit 100 may be located on the center of the length of the short side (or vertical length) of the display unit 100.

[0074] Each of the first arc member 211 and the second arc member 213 according to one embodiment of this specification may include a curved shape having a curvature corresponding to the maximum curvature of the display device 100 to be realized. Each of the first arc member 211 and the second arc member 213 may be an arc rod, arc bar, or arc pipe having a circular cross-section and a curved shape. For example, each of the first arc member 211 and the second arc member 213 may be made of a metal material, but is not necessarily limited thereto.

[0075] The first arc member 211 and the second arc member 213 can be rotated in opposite directions by the drive unit 220. In one embodiment of this specification, each of the first arc member 211 and the second arc member 213 can be rotated in opposite directions at its position by the drive unit 220. For example, the first arc member 211 can be rotated in a first rotational direction at its position by the drive unit 220, and simultaneously, the second arc member 213 can be rotated in a second rotational direction at its position by the drive unit 220. Conversely, the first arc member 211 can be rotated in a second rotational direction at its position by the drive unit 220, and simultaneously, the second arc member 213 can be rotated in a first rotational direction at its position by the drive unit 220.

[0076] The central space on the back of the display unit 100, positioned between the centers of the first arc member 211 and the second arc member 213, can be relatively large because the centers of the first arc member 211 and the second arc member 213 are positioned adjacent to the long side of the display unit 100. This increases the usability of the space on the back of the display unit 100 where mechanical or circuit components are placed, and makes it easier to arrange mechanical or circuit components.

[0077] The drive unit 220 may be located in the central region of the back of the display unit 100. The drive unit 220 may be located between the first arc member 211 and the second arc member 213.

[0078] The drive unit 220 can rotate the first arc member 211 and the second arc member 213 simultaneously. The drive unit 220 can rotate the first arc member 211 and the second arc member 213 simultaneously in opposite directions at their respective positions. For example, the drive unit 220 can rotate the first arc member 211 up to 90 degrees in the first rotational direction at its position, while simultaneously rotating the second arc member 213 up to 90 degrees in the second rotational direction at its position. Conversely, the drive unit 220 can rotate the first arc member 211 up to 90 degrees in the second rotational direction at its position, while simultaneously rotating the second arc member 213 up to 90 degrees in the first rotational direction at its position.

[0079] The drive unit 220 can simultaneously rotate the first arc member 211 and the second arc member 213 in their respective positions via the rotational motion of the rotary motor and linear motion linked to the rotational motion of the rotary motor.

[0080] The guide 230 can be positioned on the back of the display unit 100 so as to be parallel to the second direction (Y) and can movably support the first and second intermediate portions of the arc member 210, respectively. For example, in a direction of viewing the back of the display unit 100 having a curvature of 0 (zero), the first intermediate portion of the arc member 210 can be the middle (or right-side middle) between the center and one end (or first end), and the second intermediate portion of the arc member 210 can be the middle (or left-side middle) between the center and the other end (or second end). The guide 230 prevents the arc member 210 from lifting off the back of the display unit 100 with respect to the thickness direction (Z) of the display unit 100 when the curved arc member 210 rotates, thereby allowing the pressing force of the arc member 210 generated by the rotation of the arc member 210 to be applied to both sides of the display unit 100 without reduction (or loss). For example, the guide 230 can guide the movement of the rotating arc member 210 and can act as a base for the rotating arc member 210.

[0081] Each of the first (or one) and second (or other) sides of the guide 230 can be fixed to the back of the display unit 100. Each of the first and second sides of the guide 230 can be fixed to the back of the back cover 120. The intermediate portion between the first and second sides of the guide 230 can be separated from the back of the display unit 100. This allows the arc member 210 to be movably positioned in the space between the back of the display unit 100 and the intermediate portion of the guide 230, preventing it from floating during rotation, and allowing both sides of the display unit 100 to protrude forward (FD) of the display device using the guide 230 as a support base.

[0082] In one embodiment of this specification, the guide 230 is positioned in the third rear region (RA3) and the fourth rear region (RA4) of the display unit 100, and can movably support the first arc member 211 and the second arc member 213, respectively.

[0083] In the display unit 100, the third back region (RA3) may be the right-hand (or left-hand) region of the back of the display unit 100, with respect to the horizontal center line (HCL) of the display unit 100 which is parallel to the second direction (Y). The fourth back region (RA4) may be the left-hand (or right-hand) region of the back of the display unit 100, with respect to the horizontal center line (HCL) of the display unit 100. Here, the horizontal center line (HCL) of the display unit 100 may be located on the center of the length of the long side (or width) of the display unit 100. For example, in a direction of viewing the back of the display unit 100 having a curvature of 0 (zero), the third back region (RA3) may be the region between the first short side of the display unit 100 and the horizontal center line (HCL), and the fourth back region (RA4) may be the region between the second short side of the display unit 100 and the horizontal center line (HCL).

[0084] A guide 230 according to one embodiment of this specification may include first to fourth guide members 231, 232, 233, and 234.

[0085] The first guide member 231 is positioned in the third rear region (RA3) of the display unit 100 and can movably support the first intermediate portion of the first arc member 211.

[0086] The first and second sides of the first guide member 231 can each be fixed to the first rear region (RA1) of the display unit 100 with the first arc member 211 in between. For example, the first and second sides of the first guide member 231 can each be fixed to the first rear region (RA1) of the back cover 120 by connecting members such as screws or bolts.

[0087] The intermediate portion of the first guide member 231 between its first and second sides may be positioned in the third rear region (RA3) of the back cover 120 so as to intersect with the first intermediate portion of the first arc member 211. The intermediate portion of the first guide member 231 may be separated from the rear surface of the back cover 120 by a distance greater than the diameter of the first guide member 231, depending on the heights of the first and second sides. This allows the first intermediate portion of the first arc member 211 to move within the separation space between the intermediate portion of the first guide member 231 and the rear surface of the back cover 120.

[0088] The second guide member 232 is positioned in the fourth rear region (RA4) of the display unit 100 and can movably support the second intermediate portion of the first arc member 211. Since such a second guide member 232 is substantially the same as the first guide member 231, except that it is positioned in the first rear region (RA1) of the fourth rear region (RA4) of the display unit 100 and movably supports the second intermediate portion of the first arc member 211, a redundant explanation of it will be omitted.

[0089] The third guide member 233 is positioned in the third rear region (RA3) of the display unit 100 and can movably support the first intermediate portion of the second arc member 213. Since this third guide member 233 is substantially the same as the first guide member 231, except that it is positioned in the second rear region (RA2) of the third rear region (RA3) of the display unit 100 and movably supports the first intermediate portion of the second arc member 213, a redundant explanation of it will be omitted.

[0090] The fourth guide member 234 is positioned in the fourth rear region (RA4) of the display unit 100 and can movably support the second intermediate portion of the second arc member 213. Since this fourth guide member 234 is substantially the same as the first guide member 231, except that it is positioned in the second rear region (RA2) of the fourth rear region (RA4) of the display unit 100 and movably supports the second intermediate portion of the second arc member 213, a redundant explanation of it will be omitted.

[0091] The first guide member 231 and the third guide member 233 may be spaced apart from each other along the second direction (Y). The space between the first guide member 231 and the third guide member 233 may be utilized as rear space of the display unit 100 for arranging mechanical or circuit components of the display device. Similarly, the second guide member 232 and the fourth guide member 234 may be spaced apart from each other along the second direction (Y). The space between the second guide member 232 and the fourth guide member 234 may be utilized as rear space of the display unit 100 for arranging mechanical or circuit components of the display device.

[0092] A variable curvature device 200 according to one embodiment of this specification may further include a fixed bracket 240.

[0093] The fixing brackets 240 are positioned in the third rear region (RA3) and the fourth rear region (RA4) of the display unit 100, respectively, and can movably support the ends of the first arc member 211 and the second arc member 213. The fixing brackets 240 can movably support the ends of the first arc member 211 and the second arc member 213, and can guide the movement of the ends of the first arc member 211 and the second arc member 213. For this reason, the fixing brackets 240 may include side homes (or side pockets) having a certain depth from the inner surface so that the ends of the first arc member 211 and the second arc member 213 are movably inserted. Such fixing brackets 240 can transmit the pressing force applied by the ends of the first arc member 211 and the second arc member 213 to the first rear edge and the second rear edge of the display unit 100, respectively, when the first arc member 211 and the second arc member 213 rotate. In this case, the fixing bracket 240 is configured such that the tips of the first arc member 211 and the second arc member 213 make surface contact with the display unit 100, thereby also serving to prevent localized damage to the display unit 100 caused by localized point contact between the tips of the first arc member 211 and the second arc member 213 and the display unit 100.

[0094] A fixing bracket 240 according to one embodiment of this specification may include first to fourth fixing brackets 241, 242, 243, and 244.

[0095] The first fixing bracket 241 is positioned in the first rear region (RA1) within the third rear region (RA3) of the display unit 100 and can movably support one end (or first end) of the first arc member 211. For example, the first fixing bracket 241 can be fixed to the edge portion of the first rear within the first rear region (RA1) of the back cover 120.

[0096] The second fixing bracket 242 is positioned in the first rear region (RA1) within the fourth rear region (RA4) of the display unit 100 and can movably support the other end (or second end) of the first arc member 211. For example, the second fixing bracket 242 can be fixed to the edge portion of the second rear within the first rear region (RA1) of the back cover 120.

[0097] The third fixing bracket 243 is positioned in the second rear region (RA2) within the third rear region (RA3) of the display unit 100 and can movably support one end (or first end) of the second arc member 213. For example, the third fixing bracket 243 can be fixed to the edge portion of the first rear in the second rear region (RA2) of the back cover 120.

[0098] The fourth fixing bracket 244 is positioned in the second rear region (RA2) within the fourth rear region (RA4) of the display unit 100 and can movably support the other end (or second end) of the second arc member 213. For example, the fourth fixing bracket 244 can be fixed to the edge portion of the second rear within the second rear region (RA2) of the back cover 120.

[0099] Each of the first to fourth fixing brackets 241, 242, 243, and 244 can be positioned parallel to the second direction (Y) on the back surface of the display unit 100. For example, when the display unit 100 is in a planar form, the tips of the arc members 211 and 213 can be positioned adjacent to one side of each of the first to fourth fixing brackets 241, 242, 243, and 244, which are adjacent to the vertical midline (VCL) of the display unit 100. Furthermore, when the display unit 100 deforms from a planar form to a curved form, the tips of the arc members 211 and 213 can move from one side to the other of each of the first to fourth fixing brackets 241, 242, 243, and 244, while applying pressure to each of them as the arc members 211 and 213 rotate.

[0100] Additionally, each of the first to fourth fixing brackets 241, 242, 243, and 244 of the fixing bracket 240 may be positioned on the back surface of the display unit 100 at an angle to the second direction (Y) rather than parallel to the second direction (Y). In one embodiment, each of the first to fourth fixing brackets 241, 242, 243, and 244 may be positioned at an angle corresponding to the movement trajectory of the tip of the arc members 211 and 213 when the arc members 211 and 213 are rotated. For example, in each of the first to fourth fixing brackets 241, 242, 243, and 244, one side adjacent to the vertical midline (VCL) of the display unit 100 may be positioned closer to the horizontal centerline (HCL) than the other side.

[0101] The stand 300 is positioned behind the display unit 100 and can support the display unit 100 in an upright position. For example, the stand 300 may be supported by a variable curvature device 200.

[0102] One embodiment of the stand 300 according to this specification may include a base 310 and a post 330.

[0103] The base 310 can be implemented to have a fixed size. The base 310 may include a variable curvature button section (CVB) and a variable curvature control circuit that controls the drive unit 220 of the variable curvature device 200 by user operation of the variable curvature button section (CVB).

[0104] The post 330 is positioned perpendicularly to the base 310 and can be coupled to the gearbox cover 290 located on the variable curvature device 200. This allows the display unit 100 to be supported or mounted upright on the post 330 of the stand 300.

[0105] An embodiment of the display device according to this specification may further include a speaker device (or speaker unit) 350 built into the stand 300. The speaker device 350 may be built into the post 330 of the stand 300. The speaker device 350 according to one embodiment may be, but is not limited to, a woofer speaker.

[0106] An embodiment of the display device according to this specification may further include a power supply board 370 built into the stand 300. The power supply board 370 can generate and output drive power for driving the display unit 100 and the variable curvature device 200, respectively, based on an input power supply received via a power cable. The power supply board 370 according to one embodiment may include a power conversion circuit (or power conversion module) and a power management circuit (or power management module).

[0107] An embodiment of the display device according to this specification may further include a system board 390 built into the stand 300, which may increase the design flexibility of the curvature variable device 200 located on the back of the display unit 100. The system board 390 (or set main board) controls the display unit 100 and the curvature variable device 200 respectively, and may also include various electronic components or circuit modules for driving the display device and displaying images on the display unit 100. For example, the system board 390 may include a system control module for controlling the overall driving of the display device, an image source processing module, an audio processing module, and a storage module.

[0108] A display device according to one embodiment of this specification may further include a rear curtain device 400.

[0109] Referring to Figures 3 to 5, the rear curtain device 400 can be implemented on the back of the display unit 100 so as to cover the variable curvature device 200. The rear curtain device 400 can be implemented as the rear structure of the display unit. The rear curtain device 400 can be deformed to accommodate the change in curvature of the display unit 100 that occurs when the variable curvature device 200 is driven.

[0110] A rear curtain device 400 according to one embodiment of this specification may include a curtain edge frame 410, a curtain rear frame 430, and a plurality of curtain members 450.

[0111] The curtain edge frame 410 is connected to the rear edge portion of the display unit 100 and may include a first opening. For example, the curtain edge frame 410 may be implemented in a frame form, having a first opening that overlaps with the rest of the back of the display unit 100, excluding the rear edge portion. The curtain edge frame 410 may be fixed to the rear edge portion of the back cover 120 by connecting members such as screws or bolts.

[0112] The curtain back frame 430 is coupled to the curtain edge frame 410 and may include a second opening that overlaps with the first opening. For example, the curtain back frame 430 may be implemented in a frame form so as to have a second opening that overlaps with the first opening of the curtain edge frame 410. The curtain back frame 430 may be fixed to the curtain edge frame 410 by connecting members such as screws or bolts.

[0113] Multiple curtain members 450 can be fixed to the curtain back frame 430 so as to be parallel to the second direction (Y) and spaced apart from each other along the first direction (X). Multiple curtain members 450 can be positioned in the second opening of the curtain back frame 430 so as to be parallel to the second direction (Y) and spaced apart from each other along the first direction (X). For example, each of the multiple curtain members 450 can be positioned in the second opening of the curtain back frame 430 so as to have a constant tension and can be tilted to have a constant angle to accommodate changes in the curvature of the display unit 100. Each of the multiple curtain members 450 according to one embodiment of this specification may include, but is not limited to, a fiber or fabric material that is deformable to accommodate changes in the curvature of the display unit 100, and may also be made of a metal material.

[0114] A rear curtain device 400 according to one embodiment of this specification may further include a stand connection hole 470. The stand connection hole 470 is realized by removing the intermediate portion of a plurality of curtain members 450, thereby exposing the rear intermediate portion of the display unit 100 to the rear (RD) of the display unit. As a result, the stand 300 can support the display unit 100 by being coupled to or connected to the curvature variable device 200 via the stand connection hole 470 of the rear curtain device 400.

[0115] A display device according to one embodiment of this specification may further include a vibration device 500.

[0116] Referring to Figures 4 to 6, the vibration device 500 is positioned on the back of the display unit 100 and can vibrate the display unit 100 to output sound through the vibration of the display unit 100. The vibration device 500 can be positioned on the back of the display unit 100 and can be implemented to vibrate the display panel 110 so that sound is output through the vibration of the display panel 110. For example, the vibration device 500 can vibrate the first vibration region (or third back region (RA3)) and the second vibration region (or fourth back region (RA4)) of the display unit 100, respectively, and output the first sound (or left sound) and the second sound (or right sound) generated in the first vibration region and the second vibration region of the display unit 100, respectively, to the front (FD) of the display unit 100 to achieve stereo sound.

[0117] The vibrator 500 can be supported by the back cover 120 of the display unit 100, penetrate the back cover 120, and connect to the back of the display panel 110. For this reason, the back cover 120 may include a through-hole 121 into which the vibrator 500 can be inserted. For example, the vibrator 500 can be fixed to the back cover 120 of the display unit 100 and directly vibrate the display unit 100.

[0118] A vibrator 500 according to one embodiment of this specification may include first and second vibrators (or vibrators) 510 and 530.

[0119] The first vibration device 510 can output the first sound (or left-side sound) generated in the first vibration region (RA3) of the display unit 100 to the front (FD) of the display unit 100 by vibrating the first vibration region (RA3) of the display unit 100. For example, the first vibration device 510 can be supported by the back cover 120 and connected to the back of the display panel 110 by passing through a through hole 121 located in the back cover 120.

[0120] The second vibration device 530 can output the second sound (or right-side sound) generated in the second vibration region (RA4) of the display unit 100 to the front (FD) of the display unit 100 by vibrating the second vibration region (RA4) of the display unit 100. For example, the second vibration device 530 can be supported by the back cover 120 and connected to the back of the display panel 110 by passing through a through hole 121 located in the back cover 120.

[0121] The first and second vibrators 510 and 530 according to one embodiment of this specification may be configured in a twin-type structure, as shown in Figures 4 to 6. The twin-type structure can be realized in a two-array structure or a twin-type vibrator, and is not limited to the term. Each of the first and second vibrators 510 and 530 according to one embodiment of this specification may be realized in a single-type structure or in a structure of two or more arrays, and is not limited to a twin-type structure. For example, each of the first and second vibrators 510 and 530 may be configured in a four-array structure or a six-array structure.

[0122] Each of the first vibrator 510 and the second vibrator 530 according to one embodiment of this specification may include a pair of sound generators (or sound emitters) 511, 513, or first and second sound generators 511, 513, arranged parallel to each other on the display unit 100. For example, each of the first and second vibrators 510, 530 may be implemented as a twin-type vibrator including the first and second sound generators 511, 513.

[0123] The first and second sound generators 511 and 513 are supported on the back cover 120 of the display unit 100 so as to be parallel to each other and can be connected to the back of the display panel 110, respectively, by passing through the first and second through holes 121a and 121b of the through hole 121 located in the back cover 120.

[0124] The first sound generating device 511 of the first vibration device 510 can pass through a first through-hole 121a located in the back cover 120 that overlaps with the first vibration region (RA3) of the display unit 100, connect to the first vibration region (RA3) of the display panel 110, and be coupled to the back surface of the back cover 120 around the first through-hole 121a.

[0125] The second sound generator 513 of the first vibration device 510 passes through a second through-hole 121b located in the back cover 120 that overlaps with the first vibration region (RA3) of the display unit 100, and is connected to the first vibration region (RA3) of the display panel 110, and can be coupled to the back surface of the back cover 120 around the second through-hole 121b.

[0126] The first sound generating device 511 of the second vibration device 530 can pass through a first through-hole 121a located in the back cover 120 that overlaps with the second vibration region (RA4) of the display unit 100, connect to the second vibration region (RA4) of the display panel 110, and be coupled to the back surface of the back cover 120 around the first through-hole 121a.

[0127] The second sound generator 513 of the second vibration device 530 passes through a second through-hole 121b located in the back cover 120 that overlaps with the second vibration region (RA4) of the display unit 100, connects to the second vibration region (RA4) of the display panel 110, and can be coupled to the back surface of the back cover 120 around the second through-hole 121b.

[0128] Referring to Figure 7, the display unit 100 according to one embodiment of this specification may further include an intermediate member 150.

[0129] The intermediate member 150 can be implemented inside the display unit 100 so as to overlap with the curvature variable device 200. The intermediate member 150 can prevent vibrations generated by the driving of the curvature variable device 200 from being transmitted to the display panel 110. In addition, the intermediate member 150 can prevent physical contact between the display panel 110 and the back cover 120 when the curvature of the display unit 100 changes due to the curvature variable device 200.

[0130] In one embodiment, the intermediate member 150 may be positioned between the display panel 110 and the back cover 120 so as to overlap with the curvature variable device 200. For example, the intermediate member 150 may be positioned between the display panel 110 and the back cover 120 so as to overlap with the horizontal centerline (HCL) of the display unit 100. In one embodiment, the intermediate member 150 may have a linear shape parallel to the second direction (Y). In another embodiment, the intermediate member 150 may have the same shape as the contact surface of the curvature variable device 200 that contacts the back surface of the back cover 120. By positioning such an intermediate member 150 between the first vibration region (or third back region (RA3)) and the second vibration region (or fourth back region (RA4)) of the display unit 100, the first vibration region and the second vibration region are spatially separated, thereby preventing mutual interference between the first vibration region and the second vibration region.

[0131] The intermediate member 150 according to one embodiment may be made of the same or different material as the cover connecting member 130. For example, the intermediate member 150 may be an adhesive resin, double-sided tape, or double-sided adhesive foam pad, and may be elastic for shock absorption. Such an intermediate member 150 may be described as a cushioning member, reinforcing member, area separating member, or partition member, and is not limited to these terms.

[0132] Figure 8 is a cross-sectional view along line II-II' shown in Figure 6, which is a cross-sectional view showing the first vibrating device shown in Figures 4 to 6.

[0133] Referring to Figures 4 to 6 and Figure 8, each of the first vibrator 510 and the second vibrator 530 according to one embodiment of this specification includes first and second sound generating devices 511 and 513, each of which may include a base frame 501, a magnet 502, a bobbin 503, a coil 504, a center pole 505, and a damper 506.

[0134] The base frame 501 can be realized as a fixed part that is fixed to the back cover 120. The magnet 502, bobbin 503, coil 504, center pole 505, and damper 506 can be represented as a vibrating part for vibrating the display panel 110, but are not necessarily limited to this.

[0135] A base frame 501 according to one embodiment of this specification may include a frame body 501a, an upper plate 501b, and a protruding bracket 501c.

[0136] The frame body 501a can be fixed to the back cover 120. The frame body 501a can also serve as a lower plate supporting the magnet 502.

[0137] The upper plate 501b may be positioned on the front edge of the frame body 501a so as to have a cylindrical shape with a hollow section. The frame body 501a and the upper plate 501b may consist of a single body having a "U" shape. For example, the frame body 501a and the upper plate 501b may be described by other terms, such as yoke, but are not limited to these terms.

[0138] The protruding bracket 501c may protrude from the side of the upper plate 501b. The protruding bracket 501c is fixed to the back of the back cover 120 by a fastening member 515, thereby allowing the base frame 501 to be fixed to the back cover 120.

[0139] The fastening member 515 may be a screw or bolt that passes through the protruding bracket 501c and is fastened to the back surface of the back cover 120. In this case, a buffer member 600 may be interposed between the back surface of the back cover 120 and the protruding bracket 501c.

[0140] The cushioning member 600 maintains contact between the sound generators 511 and 513 and the display panel 110 by tilting the base frame 501 in accordance with the curvature of the display panel 110 when the curvature of the display panel 110 changes. For example, the cushioning member 600 may be an elastic spring or an elastic pad, but is not necessarily limited to these.

[0141] The magnet 502, bobbin 503, and coil 504 are arranged on the base frame 501 and can be represented as a magnetic circuit or magnetic vibration unit that vibrates the display panel 110.

[0142] The magnetic circuit section according to one embodiment of this specification may have an external magnetic type or dynamic type structure including a magnet 502 positioned outside the coil 504, or an internal magnetic type or micro type structure including a magnet 502 positioned inside the coil 504. Sound generators 511 and 513 including a magnetic circuit section having an internal magnetic type structure have the advantage of having a small leakage flux and an overall small size. Sound generators 511 and 513 according to this specification may have an external magnetic type or internal magnetic type structure, and in the following description, we will assume that they have an internal magnetic type structure.

[0143] The magnet 502 may be positioned in a groove of the base frame 501. The magnet 502 may be a permanent magnet having a cylindrical shape that can be inserted into the bobbin 503.

[0144] The bobbin 503 is positioned on the base frame 501 so as to surround the magnet 502 and can be coupled to the back of the display panel 110. The bobbin 503 can have a circular or elliptical shape, but is not limited thereto. The elliptical shape can include, but is not limited to, an elliptical shape, a rectangular shape with rounded corners, or a non-circular curved shape having a width different from its height. For example, in an elliptical bobbin 503, the ratio of the diameter of the major axis to the diameter of the minor axis can be configured from 1.3:1 to 2:1. An elliptical bobbin 503 can improve the high-frequency acoustics compared to a circular bobbin and may have better heat dissipation characteristics because it generates less heat due to vibration.

[0145] The coil 504 is wound around the outer surface of the bobbin 503 and is supplied with an external drive signal current (or voice current). The coil 504 can be raised and lowered together with the bobbin 503. The coil 504 can be described as a voice coil or the like, but is not limited to this term. When current is applied to the coil 504, the entire bobbin 503 moves up and down according to Fleming's left-hand rule, based on the applied magnetic field formed around the coil 504 and the external magnetic field formed around the magnet 502. The vertical movement (or vibration) of the bobbin 503 causes vibration of the display panel 110, generating sound (or vibratory sound of the panel), which may be output towards the front (FD) of the display unit 100.

[0146] The center pole 505 can be positioned on the magnet 502 to guide the vibration of the bobbin 503. For example, the center pole 505 can be inserted into or housed in the hollow portion of the bobbin 503, thereby being surrounded by the bobbin 503. For example, the center pole 505 can be represented by a lifting guide or pole pieces, etc., but is not limited to these.

[0147] The damper 506 may be positioned between the base frame 501 and the bobbin 503. In one embodiment, the damper 506 may be positioned between a protruding frame that extends from the frame body 501a of the base frame 501 to surround the upper plate 501b and the upper outer circumferential surface of the bobbin 503. The damper 506 has a bellows structure between one end and the other, allowing it to contract and relax in response to the vibration of the bobbin 503. Such a damper 506 can limit the vibration distance (or vertical movement distance) of the bobbin 503 through a restoring force. In one embodiment, when the bobbin 503 vibrates above or below a certain distance, the restoring force of the damper 506 can return it to its original position. For example, the damper 506 may be described in other terms such as spider, suspension, or edge, but is not limited thereto.

[0148] Each of the first and second sound generating devices 511 and 513 according to one embodiment of this specification may further include a bobbin protective member 507 positioned on top of the bobbin 503. For example, the bobbin protective member 507 may be represented by a bobbin ring or a bobbin cap, but is not limited thereto.

[0149] The bobbin protection member 507 is positioned on the front (or tip) of the bobbin 503 and transmits the raising and lowering (or vibration) of the bobbin 503 to the back of the display panel 110. In one embodiment, the bobbin protection member 507 may be ring-shaped, positioned on the front of the bobbin 503, disc-shaped, covering the entire front of the bobbin 503, or cap-shaped, enclosing the front and upper outer surface of the bobbin 503, and is not limited to its shape.

[0150] The bobbin protection member 507 can be positioned (or bonded) to the back of the display panel 110 via the first adhesive member. The first adhesive member can be interposed between the back of the display panel 110 and the bobbin protection member 507. The first adhesive member in one embodiment may include, but is not limited to, adhesives or double-sided tape.

[0151] One embodiment of the bobbin protection member 507 according to this specification can be made in the form of an injection-molded or metal molded product. For example, the bobbin protection member 507 can be made of a fiber-reinforced material, a composite resin containing a fiber-reinforced material, or metal, in which case it can also serve as a heat dissipation function to release the heat generated when the sound generators 511 and 513 are driven.

[0152] Referring to Figures 4 to 8, the display device according to one embodiment of this specification may further include a slit 125.

[0153] The slit 125 can be implemented to reduce the stress applied to the vibration device 500 when the curvature of the display unit 100 changes. The slit 125 can also be implemented to minimize sound quality degradation due to positional changes (or deviations) in the air gap (AG) between the display panel 110 and the back cover 120 in accordance with the curvature of the display unit 100.

[0154] The slit 125 may be located in the back cover 120 that overlaps with the vibrator 500. In one embodiment, the slit 125 may be realized to penetrate the back cover 120 that overlaps with the pair of sound generating devices 511, 513. For example, the slit 125 may be realized to penetrate the back cover 120 between a first through hole 121a and a second through hole 121b formed in the back cover 120.

[0155] The slit 125 may have a length parallel to the second direction (Y). The length of the slit 125 may be longer than the length of the sound generating devices 511, 513. One end of the slit 125 may be positioned between the pair of sound generating devices 511, 513.

[0156] The slit 125 is formed to penetrate vertically through the back cover 120 along the thickness direction (Z) of the display unit 100, thereby enabling communication between the air gap (AG) (or internal air gap) between the display panel 110 and the back cover 120 and the outside (or external air gap) on the back of the back cover 120. By connecting the air gap (AG) between the display panel 110 and the back cover 120 to the external air gap, such a slit 125 can smooth the airflow between the internal air gap (AG) and the external air gap when the display panel 110 vibrates (or trembles). This allows the display panel 110 to vibrate stably, thereby increasing the low-frequency response and sound pressure characteristics of the display panel 110 due to vibration. For example, the low-frequency range may be 800 Hz or less, but is not limited to this.

[0157] Figure 9 is an enlarged view of section "B1" shown in Figure 6, Figure 10 is an enlarged view of section "B2" shown in Figure 6, and Figure 11 is an enlarged view of section "B3" shown in Figure 6, which is a diagram illustrating the drive unit of the variable curvature device.

[0158] When Figures 9 to 11 are linked with Figure 6, the drive unit 220 of the variable curvature device 200 according to one embodiment of this specification may include a support plate 221, a rotary drive unit 222, a linear drive unit 223, a rotary link unit 224, and a holder unit 225.

[0159] The support plate 221 may be positioned to overlap the center of the back of the display unit 100. For example, the support plate 221 may be realized to have a constant width parallel to the first direction (X) and a constant length parallel to the second direction (Y), and may be positioned (or coupled) to the back of the back cover 120 to overlap the centers (or length centers) of the first arc member 211 and the second arc member 213, respectively. Such a support plate 221 can support the rotary drive unit 222, the linear drive unit 223, the rotary link unit 224, and the holder unit 225, respectively.

[0160] In one embodiment, the support plate 221 can be positioned (or joined) to the back surface of the back cover 120 by a plate fixing member. In one embodiment, the plate fixing member may be a screw or a bolt. In another example, the plate fixing member may be an elastic adhesive resin, double-sided tape, or double-sided adhesive foam pad for shock absorption. If the plate fixing member is elastic, vibrations generated by the driving of the curvature variable device 200 can be prevented from being transmitted to the back cover 120 or minimized.

[0161] The rotary drive unit 222 is located in the rear area of ​​the display unit 100 and can cause the linear drive unit 223 to move linearly via its rotational motion. For example, the rotary drive unit 222 may be located in the center of the rear of the support plate 221.

[0162] The rotary drive unit 222 according to one embodiment may include at least one rotary motor 222a, 222b, a rotary transmission unit (RTP), and a pinion gear (PG).

[0163] At least one rotary motor 222a, 222b may be located in the rear intermediate region of the display unit 100 and supported by a support plate 221. At least one rotary motor 222a, 222b can provide rotational force to the rotational transmission unit (RTP) in response to user operation for a change in the curvature of the display unit 100.

[0164] In one embodiment, the drive unit 220 may include first and second rotary motors 222a, 222b (or a pair of rotary motors) to maintain balance, reduce noise, and ensure a margin of driving force (or rotational force).

[0165] The first and second rotary motors 222a and 222b may be positioned side by side between the rotational transmission units (RTPs). The drive shaft (or rotation shaft) of the first rotary motor 222a and the drive shaft (or rotation shaft) of the second rotary motor 222b may be positioned adjacent to or facing the first arc member 211. In this case, the first and second rotary motors 222a and 222b can rotate in the same direction relative to each other.

[0166] In one embodiment, the first and second rotary motors 222a and 222b can be positioned with their drive shafts (or rotation shafts) rotated at a certain angle on the back surface of the display unit 100, facing toward the shorter side of the display unit 100.

[0167] The Rotation Transmission Unit (RTP) is positioned on the support plate 221 and may be rotatably connected to at least one rotary motor 222a, 222b. For example, the Rotation Transmission Unit (RTP) may be connected between a first rotary motor 222a and a second rotary motor 222b. The Rotation Transmission Unit (RTP) can rotate in conjunction with the rotation of at least one rotary motor 222a, 222b, or the first and second rotary motors 222a, 222b, thereby causing the pinion gear (PG) to rotate. For example, the Rotation Transmission Unit (RTP) may also be represented as a gear assembly, gear unit, or reduction gear unit, but is not limited to these.

[0168] A rotational transmission unit (RTP) according to one embodiment can transmit the rotational motion of the first and second rotary motors 222a and 222b to a pinion gear (PG). The rotational transmission unit (RTP) can rotate the pinion gear (PG) by reducing the rotational speed of the first and second rotary motors 222a and 222b. For example, the rotational transmission unit (RTP) can rotate the pinion gear (PG) in the first rotational direction by transmitting the rotational motion of the first and second rotary motors 222a and 222b in the first rotational direction (or clockwise) to the pinion gear (PG). Conversely, the rotational transmission unit (RTP) can rotate the pinion gear (PG) in the second rotational direction by transmitting the rotational motion of the first and second rotary motors 222a and 222b in the second rotational direction (or counterclockwise) to the pinion gear (PG).

[0169] A rotary transmission unit (RTP) according to one embodiment may include a first worm (W1), a first worm gear (WG1), and a first spur gear (SG1) for transmitting the rotational motion of a first rotary motor 222a to a pinion gear (PG).

[0170] The first worm (W1) can be connected to the drive shaft of the first rotary motor 222a. The first worm (W1) can rotate in the first rotational direction when the first rotary motor 222a rotates in the first rotational direction, or rotate in the second rotational direction when the first rotary motor 222a rotates in the second rotational direction.

[0171] The first worm gear (WG1) is connected to (or meshes with) the first worm (W1) and can rotate by the rotational motion of the first worm (W1). For example, when the first worm (W1) rotates once, only one gear of the first worm gear (WG1) can rotate. With respect to the thickness direction (Z) of the first worm gear (WG1), the rotation axis direction of the first worm gear (WG1) may be perpendicular to the rotation axis direction of the first worm (W1). For example, the rotation axis direction of the first worm (W1) may be parallel to the second direction (Y) or inclined from the second direction (Y), and the rotation axis direction of the first worm gear (WG1) may be parallel to the thickness direction (Z) of the back cover 120.

[0172] A first worm gear (WG1) according to one embodiment may include a double gear structure comprising a lower worm gear having a first size and an upper worm gear having a second size smaller than the first size. For example, in a first worm gear (WG1) having a double gear structure, the lower worm gear can be coupled (or meshed) with a first worm (W1), and the upper worm gear can be coupled (or meshed) with a first spur gear (SG1).

[0173] The first spur gear (SG1) can be coupled (or meshed) with the first worm gear (WG1) to rotate in a direction opposite to the rotational motion of the first worm gear (WG1). For example, the first spur gear (SG1) can be coupled (or meshed) between the upper worm gear of the first worm gear (WG1) and the second spur gear (SG2).

[0174] The second spur gear (SG2) can be coupled (or meshed) with the first spur gear (SG1) and then coupled (or meshed) with the pinion gear (PG). The second spur gear (SG2) can rotate the pinion gear (PG) by rotating in the opposite direction to the rotational motion of the first spur gear (SG1).

[0175] A second spur gear (SG2) according to one embodiment may include a double gear structure comprising a lower spur gear having a first size and an upper spur gear having a second size larger than the first size. For example, in a second spur gear (SG2) having a double gear structure, the lower spur gear may be connected to (or meshed with) a pinion gear (PG), and the upper spur gear may be connected to (or meshed with) a first spur gear (SG1).

[0176] A rotary transmission unit (RTP) according to one embodiment may further include a second worm (W2), a second worm gear (WG2), and third and fourth spur gears (SG3, SG4) for transmitting the rotational motion of the second rotary motor 222b to a pinion gear (PG).

[0177] The second worm (W2) can be connected to the drive shaft of the second rotary motor 222b. The second worm (W2) can rotate in the first rotational direction when the second rotary motor 222b rotates in the first rotational direction, or rotate in the second rotational direction when the second rotary motor 222b rotates in the second rotational direction.

[0178] The second worm gear (WG2) is connected to (or meshes with) the second worm (W2) and can rotate by the rotational motion of the second worm (W2). For example, when the second worm (W2) rotates once, only one gear of the second worm gear (WG2) can rotate. With respect to the thickness direction (Z) of the second worm gear (WG2), the rotation axis direction of the second worm gear (WG2) can be perpendicular to the rotation axis direction of the second worm (W2). For example, the rotation axis direction of the second worm (W2) can be parallel to the second direction (Y) or inclined from the second direction (Y), and the rotation axis direction of the second worm gear (WG2) can be parallel to the thickness direction (Z) of the back cover 120.

[0179] A second worm gear (WG2) according to one embodiment may include a double gear structure comprising a lower worm gear having a first size and an upper worm gear having a second size smaller than the first size. For example, in a second worm gear (WG2) having a double gear structure, the lower worm gear may be connected to (or mesh with) a second worm (W2), and the upper worm gear may be connected to (or mesh with) a third spur gear (SG3).

[0180] The third spur gear (SG3) can be coupled (or meshed) with the second worm gear (WG2) to rotate in the opposite direction to the rotational motion of the second worm gear (WG2). For example, the third spur gear (SG3) can be coupled (or meshed) between the upper worm gear of the second worm gear (WG2) and the fourth spur gear (SG4).

[0181] The fourth spur gear (SG4) can be coupled (or meshed) with the third spur gear (SG3) and can be coupled (or meshed) with the pinion gear (PG). The fourth spur gear (SG4) can rotate the pinion gear (PG) by rotating in the opposite direction to the rotational motion of the third spur gear (SG3).

[0182] A fourth spur gear (SG4) according to one embodiment may include a double gear structure comprising a lower spur gear having a first size and an upper spur gear having a second size larger than the first size. For example, in a fourth spur gear (SG4) having a double gear structure, the lower spur gear may be connected to (or meshed with) a pinion gear (PG), and the upper spur gear may be connected to (or meshed with) a third spur gear (SG3).

[0183] The pinion gear (PG) rotates due to the rotational motion transmitted by the rotational transmission unit (RTP), thereby enabling the linear drive unit 223 to move in a linear fashion.

[0184] A pinion gear (PG) according to one embodiment may include a double gear structure comprising a first pinion gear (PG1) having a first size and a second pinion gear (PG2) having a second size larger than the first size.

[0185] The first pinion gear (PG1) can be connected to (or meshed with) the linear drive unit 223. The first pinion gear (PG1) rotates due to the rotational motion transmitted by the rotational transmission unit (RTP), thereby causing the linear drive unit 223 to move in a linear fashion.

[0186] The second pinion gear (PG2) may be connected to (or meshed with) the rotational transmission unit (RTP). The second pinion gear (PG2) may be connected to (or meshed with) the second spur gear (SG2) of the rotational transmission unit (RTP). For example, the second pinion gear (PG2) may be connected to (or meshed with) the lower spur gear of the second spur gear (SG2) of the rotational transmission unit (RTP). The second pinion gear (PG2) may be additionally connected to (or meshed with) the fourth spur gear (SG4) of the rotational transmission unit (RTP). For example, the second pinion gear (PG2) may be connected to (or meshed with) the lower spur gear of the fourth spur gear (SG4) of the rotational transmission unit (RTP). The second pinion gear (PG2) can rotate due to the rotational motion of the second spur gear (SG2) of the rotational transmission unit (RTP), or due to the rotational motion of the second spur gear (SG2) and the fourth spur gear (SG4) of the rotational transmission unit (RTP).

[0187] The linear drive unit 223 rotates the rotary link unit 224 by moving linearly due to the rotational motion of the rotary drive unit 222.

[0188] The linear drive unit 223 according to one embodiment may include a first rack gear unit 223a and a second rack gear unit 223b.

[0189] The first rack gear section 223a moves linearly along the second direction (Y) in the first rear region (RA1) of the display unit 100 by the rotational motion of the pinion gear (PG) provided in the rotary drive section 222, thereby rotating the rotary link section 224, and thereby rotating the first arc member 211. For example, the first rack gear section 223a can move linearly in the first linear direction (Y+) of the second direction (Y) by the rotational motion of the pinion gear (PG) in the first rotational direction. Conversely, the first rack gear section 223a can move linearly in the second linear direction (Y-) opposite to the first linear direction (Y+) of the second direction (Y) by the rotational motion of the pinion gear (PG) in the second rotational direction.

[0190] The first rack gear section 223a according to one embodiment may include a first rack gear bar (RGB1), a first-first rack gear (RG11), and a first-second rack gear (RG12).

[0191] The first rack gear bar (RGB1) may be positioned on a support plate 221 located on the first rear region (RA1) of the display unit 100 so as to be slidable (or linearly moving) along a second direction (Y).

[0192] The first-first rack gear (RG11) may protrude (or extend) from one side (or below) of the first rack gear bar (RGB1) and be coupled (or meshed) with the pinion gear (PG). For example, the first-first rack gear (RG11) may protrude (or extend) from one side (or below) of the first rack gear bar (RGB1) along a second direction (Y) so as to overlap with the second pinion gear (PG2) of the pinion gear (PG) and be coupled (or meshed) with the first pinion gear (PG1) of the pinion gear (PG).

[0193] In one embodiment, the first-1 rack gear (RG11) is formed on the inner surface of a first projection that protrudes (or extends) from one side (or lower side) of the first rack gear bar (RGB1), and can be connected (or meshed) with one side of the first pinion gear (PG1) of the pinion gear (PG).

[0194] The first-to-second rack gear (RG12) can be formed at the other (or upper) end of the first rack gear bar (RGB1) and connected to (or mesh with) the rotating link section 224. For example, the first-to-second rack gear (RG12) can be formed at the other (or upper) end of the first rack gear bar (RGB1) with a preset pitch along a second direction (Y) and connected to (or mesh with) the rotating link section 224. The first-to-second rack gear (RG12) can cause the rotating link section 224 to rotate due to the linear motion of the first rack gear bar (RGB1).

[0195] The second rack gear section 223b moves linearly in the second direction (Y) in the second rear region (RA2) of the display unit 100 in the opposite direction to the first rack gear section 223a by the rotational motion of the pinion gear (PG) provided in the rotary drive section 222, thereby rotating the rotary link section 224, and thereby rotating the second arc member 213.

[0196] The second rack gear section 223b may be arranged parallel to the first rack gear section 223a with a pinion gear (PG) in between. The second rack gear section 223b can move linearly in the opposite direction to the first rack gear section 223a due to the rotational motion of the pinion gear (PG). For example, the second rack gear section 223b can move linearly in the second linear direction (Y-) of the second direction (Y) due to the rotational motion of the pinion gear (PG) in the first rotational direction. Conversely, the second rack gear section 223b can move linearly in the first linear direction (Y+) of the second direction (Y) due to the rotational motion of the pinion gear (PG) in the second rotational direction.

[0197] The second rack gear section 223b according to one embodiment may include a second rack gear bar (RGB2), a second-first rack gear (RG21), and a second-second rack gear (RG22).

[0198] The second rack gear bar (RGB2) may be positioned on a support plate 221 located on the second rear region (RA2) of the display unit 100 so as to be slidable (or linearly moving) along the second direction (Y).

[0199] The second-first rack gear (RG21) may protrude (or extend) from the other side (or top) of the second rack gear bar (RGB2) and be connected to (or mesh with) the pinion gear (PG). For example, the second-first rack gear (RG21) may protrude (or extend) from the other side (or top) of the second rack gear bar (RGB2) along the second direction (Y) so as to overlap with the second pinion gear (PG2) of the pinion gear (PG) and be connected to (or mesh with) the first pinion gear (PG1) of the pinion gear (PG).

[0200] In one embodiment, the second-first rack gear (RG21) is formed on the inner surface of a second projection that protrudes (or extends) from the other side (or upper side) of the second rack gear bar (RGB2), and can be connected (or meshed) with one side of the first pinion gear (PG1) of the pinion gear (PG).

[0201] The second-second rack gear (RG22) may be formed at one (or lower) end of the second rack gear bar (RGB2) and connected to (or mesh with) the rotating link section 224. For example, the second-second rack gear (RG22) may be formed at one (or lower) end of the second rack gear bar (RGB2) along a second direction (Y) with a preset pitch and connected to (or mesh with) the rotating link section 224. The second-second rack gear (RG22) can cause the rotating link section 224 to rotate due to the linear motion of the second rack gear bar (RGB2).

[0202] The first pinion gear (PG1) of the pinion gear (PG) can be connected (or meshed) between the first rack gear section 223a and the second rack gear section 223b. For example, the first pinion gear (PG1) of the pinion gear (PG) can be connected (or meshed) between the 1-1 rack gear (RG11) of the first rack gear section 223a and the 2-1 rack gear (RG21) of the second rack gear section 223b. This allows each of the first rack gear section 223a and the second rack gear section 223b to move linearly in opposite directions (+Y, -Y) due to the rotational motion of the first pinion gear (PG1) of the pinion gear (PG).

[0203] The rotating link section 224 rotates due to the linear motion of the linear drive section 223, thereby rotating the arc member 210. By rotatably fixing the rotating link section 224 to the center of the arc member 210, the linear motion of the linear drive section 223 causes the rotating link section 224 to rotate and rotate the arc member 210.

[0204] The rotating link section 224 according to one embodiment may include a first rotating link gear 224a and a second rotating link gear 224b.

[0205] The first rotating link gear 224a is fixed to the center of the first arc member 211 of the arc member 210 and rotates due to the linear motion of the first rack gear portion 223a of the linear drive unit 223, thereby rotating the first arc member 211. For example, the first rotating link gear 224a rotates in the first rotational direction due to the linear motion of the first rack gear portion 223a along the first linear direction (Y+), thereby rotating the first arc member 211 by 90 degrees in the first rotational direction. Conversely, the first rotating link gear 224a rotates in the second rotational direction due to the linear motion of the first rack gear portion 223a along the second linear direction (Y-), thereby rotating the first arc member 211 by 90 degrees in the second rotational direction. For example, the first rear region (RA1) of the display unit 100 can be deformed into a curved surface shape with a curvature greater than 0 (zero) by the rotation of the first arc member 211 in the first rotational direction accompanying the rotation of the first rotating link gear 224a in the first rotational direction, and while the first arc member 211 is rotated in the first rotational direction, it can be deformed into a planar shape with a curvature of 0 (zero) by the rotation of the first arc member 211 in the second rotational direction accompanying the rotation of the first rotating link gear 224a in the second rotational direction, or it can be returned to that state.

[0206] In one embodiment, the first rotating link gear 224a may include a plurality of pinion spur gears (PSGs) that connect to (or mesh with) the first rack gear portion 223a. For example, by including a plurality of pinion spur gears (PSGs) realized on a circumferential surface of less than half of the circumferential surface of the first rotating link gear 224a, it can rotate within a range of ±90 degrees by the linear motion of the first rack gear portion 223a.

[0207] The second rotating link gear 224b is fixed to the center of the second arc member 213 of the arc member 210, and rotates due to the linear motion of the second rack gear portion 223b of the linear drive unit 223, thereby rotating the second arc member 213. For example, the second rotating link gear 224b rotates in the second rotational direction due to the linear motion of the second rack gear portion 223b along the second linear direction (Y-), thereby rotating the second arc member 213 by 90 degrees in the second rotational direction. Conversely, the second rotating link gear 224b rotates in the first rotational direction due to the linear motion of the second rack gear portion 223b along the first linear direction (Y+), thereby rotating the second arc member 213 by 90 degrees in the first rotational direction. For example, the second rear region (RA2) of the display unit 100 can be deformed into a curved surface shape with a curvature greater than 0 (zero) by the rotation of the second arc member 213 in the second rotational direction accompanying the rotation of the second rotating link gear 224b in the second rotational direction, and while the second arc member 213 is rotated in the second rotational direction, it can be deformed into a planar shape with a curvature of 0 (zero) by the rotation of the second arc member 213 in the first rotational direction accompanying the rotation of the second rotating link gear 224b in the first rotational direction, or it can return to that state.

[0208] In one embodiment, the second rotating link gear 224b may include a plurality of pinion spur gears (PSGs) that connect to (or mesh with) the second rack gear portion 223b. For example, the second rotating link gear 224b can rotate within a range of ±90 degrees by the linear motion of the second rack gear portion 223b by including a plurality of pinion spur gears (PSGs) realized on a circumferential surface of less than half of the circumferential surface.

[0209] The holder portion 225 can be positioned on the support plate 221 to rotatably support the arc member 210. For example, the holder portion 225 can be positioned on the support plate 221 to rotatably support the first arc member 211 and the second arc member 213 of the arc member 210.

[0210] The holder portion 225 according to one embodiment may include a pair of first holders 225a and a pair of second holders 225b.

[0211] The pair of first holders 225a are arranged on the support plate 221 parallel to each other, sandwiching the first rack gear portion 223a and the first rotating link gear 224a respectively, so that the first arc member 211 of the arc member 210 can be rotatably supported. For example, the first arc member 211 can pass through each of the pair of first holders 225a and be rotatably supported by each of the pair of first holders 225a.

[0212] The pair of second holders 225b are arranged on the support plate 221 parallel to each other, sandwiching the second rack gear portion 223b and the second rotating link gear 224b respectively, so that the second arc member 213 of the arc member 210 can be rotatably supported. For example, the second arc member 213 can be rotatably supported by passing through each of the pair of second holders 225b.

[0213] In one embodiment, the holder portion 225 may further include a first bearing 226a interposed between each of the pair of first holders 225a and the first arc member 211, and a second bearing 226b interposed between each of the pair of second holders 225b and the second arc member 213.

[0214] The drive unit 220 of the variable curvature device 200 according to one embodiment of this specification may further include a guide rail unit 227.

[0215] The guide rail section 227 is positioned between the support plate 221 and the linear drive unit 223, and can guide the linear motion of the linear drive unit 223.

[0216] The guide rail section 227 according to one embodiment may include a first guide rail 227a disposed between the support plate 221 and the first rack gear section 223a of the linear drive section 223, and a second guide rail 277b disposed between the support plate 221 and the second rack gear section 223b of the linear drive section 223.

[0217] The first guide rail 227a can guide the sliding of the first rack gear bar (RGB1) of the first rack gear section 223a. For example, the first guide rail 227a may be positioned on the support plate 221 so as to have a guide groove. In this case, the first rack gear bar (RGB1) of the first rack gear section 223a may include a sliding projection that is slidably inserted into the guide groove of the first guide rail 227a. This allows the first rack gear section 223a to move linearly on the first guide rail 227a by the rotation of the pinion gear (PG).

[0218] The second guide rail 277b can guide the sliding of the second rack gear bar (RGB2) of the second rack gear section 223b. For example, the second guide rail 277b may be positioned on the support plate 221 so as to have a guide groove. In this case, the second rack gear bar (RGB2) of the second rack gear section 223b may include a sliding projection that is slidably inserted into the guide groove of the second guide rail 277b. This allows the second rack gear section 223b to move linearly on the second guide rail 277b by the rotation of the pinion gear (PG).

[0219] The drive unit 220 of the variable curvature device 200 according to one embodiment of this specification may further include a limit switch unit 228.

[0220] The limit switch unit 228 is positioned on the support plate 221 adjacent to the linear drive unit 223 and can limit the maximum linear motion distance of the linear drive unit 223. For example, the limit switch unit 228 can limit the maximum linear motion distance of the linear drive unit 223 by physical contact with the linear drive unit 223.

[0221] The limit switch section 228 according to one embodiment may include a first limit switch section 228a and a second limit switch section 228b.

[0222] The first limit switch section 228a can limit the maximum linear motion distance of the first rack gear section 223a, which moves linearly along the second direction (Y). The first limit switch section 228a can also limit the maximum rotation angle of the first arc member 211 and the maximum curvature of the display unit 100.

[0223] In one embodiment, the first limit switch section 228a may include a first switch contact section (SCP1) formed on the outer wall of the first rack gear section 223a, a first-first limit switch (LS11) that contacts one side of the first switch contact section (SCP1), and a first-second limit switch (LS12) that contacts the other side of the first switch contact section (SCP1).

[0224] The first switch contact portion (SCP1) may include a recess (or protrusion) formed in the outer wall of the first rack gear bar (RGB1) adjacent to the first-to-second rack gear (RG12) of the first rack gear portion 223a. For example, the first switch contact portion (SCP1) may be formed recessed in the outer wall of the first rack gear bar (RGB1) so as to have a trapezoidal structure.

[0225] One side of the first switch contact portion (SCP1) can be formed to be inclined at a certain angle from the outer wall of the first rack gear bar (RGB1). For example, one side of the first switch contact portion (SCP1) may be formed to have an inclined surface and may be a first-first stopper (SP11) that contacts the first-first limit switch (LS11) due to the linear motion (Y-) of the first rack gear bar (RGB1).

[0226] The other side of the first switch contact portion (SCP1) can be formed to be inclined at a certain angle along the second direction (Y) from the outer wall of the first rack gear bar (RGB1) which is spaced apart from one side of the first switch contact portion (SCP1). For example, the other side of the first switch contact portion (SCP1) may be formed to have an inclined surface and may be a first-second stopper (SP12) that contacts the first-second limit switch (LS12) due to the linear motion (Y+) of the first rack gear bar (RGB1).

[0227] The first-first limit switch (LS11) can generate a first-first limit signal and provide it to the variable curvature control circuit when it physically contacts the first-first stopper (SP11) formed on the first rack gear section 223a, which moves linearly along the second linear direction (Y-). The variable curvature control circuit can stop the rotation of the rotary motors 222a and 222b in response to the first-first limit signal provided by the first-first limit switch (LS11).

[0228] The first-second limit switch (LS12) can generate a first-second limit signal and provide it to the variable curvature control circuit when it physically contacts the first-second stopper (SP12) formed on the first rack gear section 223a, which moves linearly along the first linear direction (Y+). The variable curvature control circuit can stop the rotation of the rotary motors 222a and 222b in response to the first-second limit signal provided by the first-second limit switch (LS12).

[0229] The second limit switch section 228b can limit the maximum linear motion distance of the second rack gear section 223b, which moves linearly along the second direction (Y). The second limit switch section 228b can limit the maximum rotation angle of the second arc member 213, or limit the maximum curvature of the display unit 100.

[0230] In one embodiment, the second limit switch section 228b may include a second switch contact section (SCP2) formed on the outer wall of the second rack gear section 223b, a second-first limit switch (LS21) that contacts one side of the second switch contact section (SCP2), and a second-second limit switch (LS22) that contacts the other side of the second switch contact section (SCP2).

[0231] The second switch contact portion (SCP2) may include a recess (or protrusion) formed in the outer wall of the second rack gear bar (RGB2) adjacent to the 2-2 rack gear (RG22) of the second rack gear portion 223b. For example, the second switch contact portion (SCP2) may be formed recessed in the outer wall of the second rack gear bar (RGB2) to have a trapezoidal structure.

[0232] One side of the second switch contact portion (SCP2) may be formed to be inclined at a certain angle from the outer wall of the second rack gear bar (RGB2). For example, one side of the second switch contact portion (SCP2) may be formed to have an inclined surface and may be a second-first stopper (SP21) that contacts the second-first limit switch (LS21) due to the linear motion (Y-) of the second rack gear bar (RGB2).

[0233] The other side of the second switch contact portion (SCP2) may be formed to be inclined at a certain angle along the second direction (Y) from the outer wall of the second rack gear bar (RGB2) which is spaced apart from one side of the second switch contact portion (SCP2). For example, the other side of the second switch contact portion (SCP2) may be a second-second stopper (SP22) formed to have an inclined surface and to contact the second-second limit switch (LS22) by the linear motion (Y+) of the second rack gear bar (RGB2).

[0234] The second-first limit switch (LS21) can generate a second-first limit signal and provide it to the variable curvature control circuit when it physically contacts the second-first stopper (SP21) formed on the second rack gear section 223b, which moves linearly along the first linear direction (Y+). The variable curvature control circuit can stop the rotation of the rotary motors 222a and 222b in response to the second-first limit signal provided by the second-first limit switch (LS21).

[0235] The second-second limit switch (LS22) can generate a second-second limit signal and provide it to the variable curvature control circuit when it physically contacts the second-second stopper (SP22) formed on the second rack gear section 223b, which moves linearly along the second linear direction (Y-). The variable curvature control circuit can stop the rotation of the rotary motors 222a and 222b in response to the second-second limit signal provided by the second-second limit switch (LS22).

[0236] The drive unit 220 of the variable curvature device 200 according to one embodiment of this specification may further include a sliding guide unit 229.

[0237] The sliding guide portion 229 can be implemented so that the linear drive portion 223 does not float and moves linearly along the second direction (Y).

[0238] The sliding guide portion 229 according to one embodiment may include a pair of first slide guides 229a and a pair of second slide guides 229b.

[0239] A pair of first slide guides 229a may be positioned on the support plate 221 with the first rack gear section 223a in between. Each of the pair of first slide guides 229a may cover the upper edge portion and outer wall of the first rack gear section 223a. For example, each of the pair of first slide guides 229a may include a side wall portion that covers the outer wall of the first rack gear section 223a and a front portion that covers the upper edge portion of the first rack gear section 223a. Such a pair of first slide guides 229a can guide the linear motion of the first rack gear section 223a through the side wall portion and prevent the first rack gear section 223a from floating as it moves linearly through the front portion.

[0240] A pair of second slide guides 229b may be positioned on the support plate 221 with the second rack gear section 223b in between. Each of the pair of second slide guides 229b may cover the upper edge portion and outer wall of the second rack gear section 223b. For example, each of the pair of second slide guides 229b may include a side wall portion that covers the outer wall of the second rack gear section 223b and a front portion that covers the upper edge portion of the second rack gear section 223b. Such a pair of second slide guides 229b can guide the linear motion of the second rack gear section 223b through the side wall portion and prevent the second rack gear section 223b from floating as it moves linearly through the front portion.

[0241] Other examples of the variable curvature device 200 described herein may further include a gearbox cover 290.

[0242] The gearbox cover 290 may be implemented so as to be coupled to the support plate 221 and cover the center of the drive unit 220. The gearbox cover 290 may be supported or mounted on the stand post.

[0243] Figure 12A is a cross-sectional view showing the planar configuration of the display device according to this specification, and Figure 12B is a cross-sectional view showing the curvature variable state of the display device according to this specification.

[0244] Referring to Figure 12A, in the display device according to this specification, the display unit 100 may be arranged (or realized) in a planar form having a curvature (R0) of O(zero). For example, as shown in Figures 9 to 11, the rotating motors 222a and 222b of the variable curvature device 200 can stop their rotational motion based on the 1-1 limit signal of the first limit switch unit 228a and the 2-1 limit signal of the second limit switch unit 228b.

[0245] The planar display unit 100 can be positioned (or realized) in a curved form having a curvature (R1) that is not O (zero), as shown in Figures 1, 2, and 12B, in response to user operation. For example, the arc member 210 of the curvature variable device 200, when laid on its side parallel to the back of the display unit 100, rotates up to a maximum of 90 degrees in a predetermined position in conjunction with the rotational movement of the rotary motors 222a and 222b in response to user operation, raising it in the thickness direction (Z) of the display unit 100. The pressure generated at the tip of the arc member 210 as it rotates is applied to the display unit 100 via the fixed bracket 240, thereby causing both sides of the display unit 100 to protrude forward (FD) of the display unit than the central part. Finally, the display unit 100 can be deformed into a curved shape with a curvature (R1) that is not zero (O) by the rotational motion of the arc member 210 raised in the thickness direction (Z) of the display unit 100, causing both sides of the display unit 100 to protrude further forward (FD) than the central part of the display device. For example, as shown in Figures 9 to 11, the rotation motors 222a and 222b of the curvature variable device 200 that deforms the display unit 100 into a curved shape can be stopped based on the first-to-second limit signal of the first limit switch unit 228a and the second-to-second limit signal of the second limit switch unit 228b.

[0246] Conversely, the arc member 210 of the curvature variable device 200 rotates from an upright position in the thickness direction (Z) of the display unit 100 to a predetermined position up to 90 degrees in conjunction with the rotational movement of the rotary motors 222a and 222b in response to user operation, and lies on its side parallel to the back of the display unit 100. As a result, the display unit 100 can be positioned (or realized) in a planar shape having a curvature (R0) of O (zero) due to its elastic restoring force.

[0247] Figure 13 is a diagram illustrating a position adjustment device in a display device according to one embodiment of this specification.

[0248] Referring to Figure 13, a position adjustment device 700 according to one embodiment of this specification can be implemented to raise (Y+) or lower (Y-) the height of the display unit 100 mounted on the stand 300.

[0249] The position adjustment device 700 (or position adjustment unit) may include a support bracket 710 and a display lifting device 720.

[0250] The support bracket 710 may be coupled to the back of the display unit 100. In one embodiment of this specification, the support bracket 710 may be coupled to the gearbox cover 290 of the variable curvature device 200 located on the back of the display unit 100 as shown in Figures 5, 6, and 9. For example, the support bracket 710 may be coupled to the gearbox cover 290 by fastening members such as screws or bolts, or it may support the gearbox cover 290.

[0251] The display lifting device 720 may be positioned on the post 330 of the stand 300 and connected to the support bracket 710. The display lifting device 720 can adjust the height of the display unit 100 mounted on the support bracket 710 by raising (Y+) or lowering (Y-) the support bracket 710 in a second direction (Y) by the user's operation of the height adjustment knob 727. For example, the display lifting device 720 can raise or lower the height of the display unit 100 from a reference position (Pref) by raising or lowering the support bracket 710 using a ball screw mechanism.

[0252] A display lifting device 720 according to one embodiment of this specification may include a connecting frame 721, a lifting shaft 723, a lifting guide 725, and a lifting adjustment knob 727.

[0253] The connecting frame 721 is positioned in the thickness direction (Z) of the display unit 100 and can penetrate the inner wall of the post 330 of the stand 300 and be coupled to the support bracket 710.

[0254] The lifting shaft 723 is positioned to move up and down inside the post 330 parallel to the second direction (Y) and can be coupled to the connecting frame 721.

[0255] The lifting guide 725 is positioned inside the post 330 parallel to the second direction (Y) and can guide the lifting shaft 723 up and down. For example, the lifting guide 725 may include a guide rail that guides the lifting shaft 723 up and down. In this case, the lifting shaft 723 includes a guide groove into which the guide rail of the lifting guide 725 is inserted and can move up and down in the second direction (Y) along the guide rail of the lifting guide 725.

[0256] The height adjustment knob 727 may be rotatably positioned on the upper surface of the post 330 and connected to the upper side of the lifting shaft 723. The height adjustment knob 727 can be rotated in a first rotational direction by the user to raise the lifting shaft 723 (Y+), and rotated in a second rotational direction by the user to lower the lifting shaft 723 (Y-). For this reason, the height adjustment knob 727 may include a threaded portion 727a, and the lifting shaft 723 may include a threaded hole 725a positioned on the upper side and connected to (or meshed with) the threaded portion 727a of the height adjustment knob 727.

[0257] The threaded portion 727a of the height adjustment knob 727 rotates in response to the rotation of the height adjustment knob 727, causing the height adjustment shaft 723 to move linearly in the second direction (Y). For example, when the height adjustment knob 727 rotates in the first rotational direction, the threaded portion 727a rotates in the first rotational direction, causing the height adjustment shaft 723 to move linearly (or rise) in the second direction (Y). Conversely, when the height adjustment knob 727 rotates in the second rotational direction, the threaded portion 727a rotates in the second rotational direction, causing the height adjustment shaft 723 to move linearly (or descend) in the second direction (Y).

[0258] A position adjustment device 700 according to one embodiment of this specification can be implemented to tilt a vertical display unit 100 mounted on a stand 300 at a certain angle (θ1, θ2). For this reason, the position adjustment device 700 may further include a display tilt device 730.

[0259] The display tilt device 730 is positioned between the support bracket 710 and the display lifting device 720, allowing the user to tilt the display unit 100 by a certain angle (θ1, θ2).

[0260] A display tilt device 730 according to one embodiment of this specification may include a tilt housing 731, a support frame 733, a ball nut 735, a tilt adjustment knob 737, and a knob support portion 739.

[0261] The tilt housing 731 may be coupled to the rear of the support bracket 710. For example, the tilt housing 731 may be coupled to the rear of the support bracket 710 between the support bracket 710 and the post 330 of the stand 300.

[0262] The support frame 733 can be supported (or coupled) to the connecting frame 721 of the display lifting device 720 and rotatably supported on the tilt housing 731. The tilt housing 731 can be rotatably supported on the support frame 733 via the tilt axis 732.

[0263] A ball nut 735 (or ball screw nut) can be secured to the upper interior side of the tilt housing 731.

[0264] The tilt adjustment knob 737 may be positioned on the rear of the tilt housing 731 to engage with (or mesh with) the ball nut 735. The tilt adjustment knob 737 may include a ball screw that penetrates the rear of the tilt housing 731 and engages with (or meshes with) the ball nut 735.

[0265] The tilt adjustment knob 737 can be rotated by the user in a first rotational direction, advancing the ball nut 735 in the thickness direction (Z) of the display unit 100, thereby tilting the tilt housing 731 by a first angle (θ1) around the tilt axis 732. For example, the display unit 100 in a vertical position (Pv) can be tilted by a first angle (θ1) from the vertical position (Pv) when the tilt adjustment knob 737 rotates in the first rotational direction, as the upper part protrudes forward of the display unit beyond the lower part.

[0266] Conversely, the tilt adjustment knob 737 can be rotated in a second rotational direction by the user, causing the ball nut 735 to move backward in the thickness direction (Z) of the display unit 100, thereby returning the tilt housing 731 to the vertical position (Pv) using the tilt axis 732 as the axis of rotation, or tilting it by a second angle (θ2) from the vertical position (Pv). For example, when the tilt adjustment knob 737 rotates in the second rotational direction, the display unit 100 in the vertical position (Pv) can be tilted by a second angle (θ2) from the vertical position (Pv) by the lower part protruding forward of the display unit beyond the upper part.

[0267] The knob support portion 739 can either connect to the upper side of the support frame 733 or protrude from the upper side of the support frame 733 to rotatably support the tilt adjustment knob 737. The knob support portion 739 can rotatably support a protruding shaft that protrudes from the back of the tilt adjustment knob 737. As a result, the tilt adjustment knob 737 can rotate in that position without linear motion, using the knob support portion 739 as a support base, thereby causing the ball nut 735 to move linearly.

[0268] Thus, the display device including the position adjustment device 700 in this example can provide a viewing height and angle that suits the user's preferences by adjusting the height and angle of the display unit 100 through user operation.

[0269] Figure 14 is an exploded perspective view showing a display device according to another example of this specification, Figure 15 shows a variable curvature device and a vibration device located on the back of the display unit shown in Figure 14, and Figure 16 is a cross-sectional view along line III-III' shown in Figure 14, which is a modified version of the display device shown in Figures 1 to 13. Accordingly, in the following description, the same reference numerals are used for the remaining components excluding the display unit, and any redundant explanations will be omitted or simplified.

[0270] Referring to Figures 14 to 16, in a display device according to another example of this specification, the display unit 100 may further include a groove 127 for housing a variable curvature device 200.

[0271] The groove 127 can be formed recessed from the back of the display unit 100 to house the variable curvature device 200. For example, by housing the variable curvature device 200 in the groove (home portion) 127, the thickness of the display unit can be reduced.

[0272] In one embodiment, the groove 127 may include a first groove 127a that is concavely realized from the back surface of the display unit 100 so as to overlap with the variable curvature device 200.

[0273] The first groove 127a can be formed recessed in the back cover 120, which overlaps with the drive unit 220 of the curvature variable device 200. For example, the first groove 127a can be formed recessed in the back cover 120 by protruding from the back cover 120 to the rear side of the display panel 110. By having a form that extends long along the second direction (Y), the groove 127 can protrude from the back cover 120 to the rear side of the display panel 110, thereby reinforcing the rigidity of the display unit 100 without affecting the change in curvature of the display unit 100, where both sides of the display unit 100 protrude forward (FD) of the display unit 100 more than the central part, based on the first direction (X). For example, if the groove 127 is formed in a form that extends long along the first direction (X) other than the second direction (Y), it may be impossible or difficult to change the curvature of the display unit 100 by reinforcing the rigidity of the display unit 100 with the groove 127. Thus, the first groove 127a can be described as a recess, carved-out portion, housing portion, storage portion, rigid reinforcement portion, space division portion, or forming portion, and is not limited to these terms.

[0274] The first groove 127a can have the same shape as the support plate 221 of the curvature variable device 200. The distance (or height) between the bottom of the first groove 127a and the back surface of the back cover 120 can be the same as or greater than the height (or thickness) of the support plate 221 of the curvature variable device 200. For example, the distance (or height) between the bottom of the first groove 127a and the back surface of the back cover 120 can be the same as or greater than the height (or thickness) of the support plate 221 of the curvature variable device 200 within the shortest distance between the display panel 110 and the back cover 120.

[0275] The support plate 221 of the curvature variable device 200 according to an embodiment can be disposed (or coupled) on the back surface of the back cover 120 by a plate fixing member. As an example, the plate fixing member can be a screw or a bolt, etc. As another example, the plate fixing member can be an adhesive resin, a double-sided tape, or a double-sided adhesive foam pad having elasticity for shock absorption. When the plate fixing member has elasticity, vibrations generated by driving of the curvature variable device 200 can be prevented from being transmitted to the back cover 120 or minimized.

[0276] The first groove 127a can be connected or coupled to the back surface of the display panel 110 via the intermediate member 150. For example, the intermediate member 150 can be disposed or interposed between the first groove 127a and the display panel 110.

[0277] The first groove 127a allows for the spatial separation of the rear region of the display unit 100 into a left rear region (LRA) and a right rear region (RRA) when viewing the rear of the display unit 100. For example, by spatially separating the rear region of the display unit 100 into a left rear region (LRA) and a right rear region (RRA) together with the intermediate member 150, the first groove 127a spatially separates the first vibration region and the second vibration region of the display panel 110. This prevents or minimizes mutual interference between the first vibration region and the second vibration region, thereby improving the acoustic characteristics generated by the vibration of the display panel 110. The first groove 127a and the intermediate member 150 can be described as a spatial division section or partition member, etc., and are not limited to these terms.

[0278] The groove 127 in one embodiment may further include a second groove 127b and a third groove 127c that are concavely realized from the back surface of the display unit 100 so as to overlap with the fixed bracket 240 of the variable curvature device 200.

[0279] The second groove 127b can be formed recessed in the back cover 120, overlapping with the first and third fixing brackets 241 and 243 of the curvature variable device 200. For example, the second groove 127b can be formed recessed in the back cover 120 by protruding from the back cover 120 to the rear side of the display panel 110. For example, by forming the second groove 127b recessed in the first rear edge portion of the back cover 120 along the second direction (Y) to accommodate both the first and third fixing brackets 241 and 243, the rigidity of the end portion of the display unit 100 can be reinforced without affecting the change in curvature of the display unit 100.

[0280] The distance (or height) between the bottom of the second groove 127b and the back surface of the back cover 120 may be the same as, or substantially the same within the range of process tolerance as, the distance (or height) between the bottom of the first groove 127a and the back surface of the back cover 120. For example, the center of the arc member 210 positioned on the back surface of the back cover 120 can be brought as close to the back surface of the back cover 120 as the insertion depth to which the drive unit 220 of the curvature variable device 200 is inserted into the first groove 127a. This allows the first and third fixing brackets 241 and 243 to be inserted into the second groove 127b, thereby maintaining a constant distance between the center and one end of the arc member 210 and the back surface of the back cover 120, or allowing the center and one end of the arc member 210 to be in equilibrium.

[0281] The third groove 127c may be formed recessed in the back cover 120, overlapping with the second and fourth fixing brackets 242 and 244 of the curvature variable device 200. For example, the third groove 127c may be formed recessed in the back cover 120 by protruding from the back cover 120 to the rear side of the display panel 110. For example, by forming the third groove 127c recessed in the second rear edge portion of the back cover 120 along the second direction (Y) to accommodate both the second and fourth fixing brackets 242 and 244, the rigidity of the end portion of the display unit 100 can be reinforced without affecting the change in curvature of the display unit 100.

[0282] The distance (or height) between the bottom of the third groove 127c and the back surface of the back cover 120 may be the same as, or substantially the same within the range of process tolerance as, the distance (or height) between the bottom of the first groove 127a and the back surface of the back cover 120. For example, the center of the arc member 210 positioned on the back surface of the back cover 120 can be brought close to the back surface of the back cover 120 by the insertion depth to which the drive unit 220 of the curvature variable device 200 is inserted into the first groove 127a. As a result, when the second and fourth fixing brackets 242 and 244 are inserted into the third groove 127c, the distance between the center and other end of the arc member 210 and the back surface of the back cover 120 is kept constant, or the center and other end of the arc member 210 can be in equilibrium.

[0283] The second groove 127b and the third groove 127c can each be connected or joined to the back of the display panel 110 via a cover connecting member 130. For example, the cover connecting member 130 can be positioned between each of the second groove 127b and the third groove 127c and the display panel 110, or interposed between them.

[0284] Other embodiments of the display device according to this specification, such as the display device shown in Figures 1 to 13, can maximize the viewer's immersion through a curved display unit 100 (or display screen), and can maximize the user's (or viewer's) immersion through the sound generated by the vibration of the display panel 110. Furthermore, other embodiments of the display device according to this specification can have a thin thickness by further including a groove 127 that houses a variable curvature device 200, the rigidity of the display unit 100 is reinforced, and by spatially dividing the first vibration region and the second vibration region of the display panel 110 with the groove 127 and the intermediate member 150, the characteristics of the sound generated by the vibration of the display panel 110 are improved, and stereo sound can be achieved.

[0285] Figure 17 is an exploded perspective view showing another example of a display device according to this specification, and Figure 18 is a cross-sectional view along line IV-IV' shown in Figure 17, which is a modified version of the display device shown in Figures 1 to 13, with a different vibration device. Accordingly, in the following description, the same reference numerals are used for the remaining components excluding the vibration device, and any redundant explanations will be omitted or simplified.

[0286] Referring to Figures 1, 17, and 18, in another example of a display device according to this specification, the vibration device 500 may be implemented inside the display unit 100.

[0287] The vibration device 500 can be implemented by using the display panel 110 as a diaphragm so that the sound (PVS) generated by the vibration of the display panel 110 is output to the front (FD) of the display device. The vibration device 500 according to one embodiment may include a film structure using a piezoelectric element (or piezoelectric material) having piezoelectric properties (or piezoelectric effect). For example, the vibration device 500 can be expressed as a film speaker, film tweeter, piezoelectric film actuator, acoustic film actuator, film exciter, piezoelectric film speaker, acoustic film speaker, acoustic film tweeter, or piezoelectric film tweeter, and is not limited thereto.

[0288] The vibration device 500 can vibrate the display panel 110 by placing it in or creating an air gap (AG) between the display panel 110 and the back cover 120.

[0289] In one embodiment, the vibration device 500 is connected (or coupled) to the back of the display panel 110 and can vibrate the display panel 110 to output sound (PVS). For example, the vibration device 500 can directly vibrate the display panel 110. Selectively, the vibration device 500 can be placed on the back cover 120 facing the back of the display panel 110, generating sound pressure in the air gap (AG), and vibrating the display panel 110 with this sound pressure. For example, the vibration device 500 can indirectly vibrate the display panel 110.

[0290] The vibration device 500 can vibrate by repeatedly contracting and expanding alternately due to the piezoelectric effect (or piezoelectric properties) caused by an externally applied acoustic signal (or voice signal). This vibration can cause the display panel 110 to vibrate, thereby generating sound (PVS) through the vibration of the display panel 110.

[0291] The vibration device 500 can be connected (or bonded) to the back surface of the display panel 110 via an adhesive member 590. The adhesive member 590 may include, but is not limited to, double-sided tape, double-sided foam tape, double-sided foam pad, double-sided foam pad tape, double-sided adhesive pad, double-sided adhesive gap pad, or double-sided adhesive foam pad, which contain an adhesive resin or have an adhesive layer. For example, the adhesive resin or adhesive layer of the adhesive member 590 may include, but is not limited to, acrylic or urethane adhesive materials. For example, the adhesive resin or adhesive layer of the adhesive member 590 may include an acrylic adhesive material that has relatively higher hardness compared to a urethane adhesive material that has relatively flexible properties, so that the vibrations of the vibration device 500 are transmitted to the display panel 110 without loss.

[0292] The vibration device 500 according to one embodiment may include a first vibration generator 550 and a second vibration generator 570.

[0293] The first vibration generator 550 can be implemented to vibrate a first vibration region (LRA) of the display panel 110. For example, the first vibration generator 550 can be connected (or bonded) to the back of the display panel 110 corresponding to the first vibration region (LRA) of the display panel 110 via an adhesive member 590.

[0294] The first vibration generator 550 includes a piezoelectric element (or piezoelectric material) having piezoelectric properties and can be implemented to vibrate a first vibration region (LRA) of the display panel 110. For example, the first vibration generator 550 can be connected (or coupled) to the back of the display panel 110 corresponding to the first vibration region (LRA) of the display panel 110 via an adhesive member 590. Such a first vibration generator 550 vibrates the first vibration region (LRA) of the display panel 110, thereby outputting a first sound (or left-side sound) generated by the vibration of the first vibration region (LRA) of the display panel 110 to the front (FD) of the display device.

[0295] The second vibration generator 570 can be implemented to vibrate the second vibration region (RRA) of the display panel 110. For example, the second vibration generator 570 can be connected (or bonded) to the back of the display panel 110 corresponding to the second vibration region (RRA) of the display panel 110 via an adhesive member 590.

[0296] The second vibration generator 570 includes a piezoelectric element (or piezoelectric material) having piezoelectric properties and can be implemented to vibrate the second vibration region (RRA) of the display panel 110. For example, the second vibration generator 570 can be connected (or coupled) to the back of the display panel 110 corresponding to the second vibration region (RRA) of the display panel 110 via an adhesive member 590. Such a second vibration generator 570 vibrates the second vibration region (RRA) of the display panel 110, thereby outputting a second sound (or right-side sound) generated by the vibration of the second vibration region (RRA) of the display panel 110 to the front (FD) of the display device.

[0297] The first vibration region (LRA) and the second vibration region (RRA) of the display panel 110 are spatially separated by the aforementioned intermediate member 150, thereby preventing or minimizing the mutual interference between the first and second sounds and improving the characteristics of the sound generated by the vibration of the display panel 110.

[0298] Thus, the display device according to this specification and other examples can have the same effects as the display device shown in FIGS. 1 to 13. Further, the display device according to this specification and other examples can have a thin thickness by realizing the vibration device 500 inside the display 100, there is no mechanical interference between the vibration device 500 and the curvature variable device 200, and the design freedom for each of the vibration device 500 and the curvature variable device 200 can be improved.

[0299] FIG. 19 is an exploded perspective view showing a display device according to this specification and other examples, and FIG. 20 is a cross-sectional view taken along line V-V' shown in FIG. 19, which is a modification of the display device shown in FIGS. 14 to 16 with a changed vibration device. Accordingly, in the following description, the same reference numerals are given to the remaining components except the vibration device, and the accompanying redundant descriptions are omitted or simplified.

[0300] Referring to FIGS. 1, 19, and 20, in the display device according to this specification and other examples, the vibration device 500 can be realized inside the display 100.

[0301] The vibration device 500 can be realized to output the sound (PVS) generated by the vibration of the display panel 110 to the front (FD) of the display device by using the display panel 110 as a diaphragm. Since such a vibration device 500 is substantially the same as the vibration device 500 described in FIGS. 17 and 18, the redundant description thereof is omitted or simplified.

[0302] The vibration device 500 according to one embodiment may include a first vibration generator 550 and a second vibration generator 570.

[0303] The first vibration generator 550 can be implemented to vibrate a first vibration region (LRA) of the display panel 110. For example, the first vibration generator 550 can be connected (or bonded) to the back of the display panel 110 corresponding to the first vibration region (LRA) of the display panel 110 via an adhesive member 590. Since such a first vibration generator 550 is substantially the same as the first vibration generator 550 described in Figures 17 and 18, a redundant explanation will be omitted.

[0304] The second vibration generator 570 can be implemented to vibrate the second vibration region (RRA) of the display panel 110. For example, the second vibration generator 570 can be connected (or bonded) to the back of the display panel 110 corresponding to the second vibration region (RRA) of the display panel 110 via an adhesive member 590. Since such a second vibration generator 570 is substantially the same as the second vibration generator 570 described in Figures 17 and 18, a redundant explanation will be omitted.

[0305] The first vibration region (LRA) and the second vibration region (RRA) of the display panel 110 are spatially separated by the first groove 127a of the groove portion 127 and the intermediate member 150 between the display panel 110. This prevents or minimizes mutual interference between the first and second acoustics, thereby improving the acoustic characteristics generated by the vibration of the display panel 110.

[0306] Thus, other examples of display devices according to this specification can have the same effects as the display devices shown in Figures 14 to 16. In addition, other examples of display devices according to this specification can have the same additional effects as the display devices shown in Figures 17 and 18. Furthermore, by further including a groove 127 that houses the variable curvature device 200, the display device according to this specification can have an even thinner thickness, the rigidity of the display unit 100 is reinforced, and the first vibration region (LRA) and the second vibration region (RRA) of the display panel 110 are spatially divided by the groove 127 and the intermediate member 150, thereby improving the acoustic characteristics generated by the vibration of the display panel 110 and realizing stereo sound.

[0307] Figure 21 is a diagram showing a vibration generator according to one embodiment of this specification, and is a diagram for illustrating the first and second vibration generators shown in Figures 17 to 20.

[0308] Referring to Figure 12, each of the first vibration generator 550 and the second vibration generator 570 according to one embodiment of this specification may include a piezoelectric vibration section 551, a first electrode section (E1), and a second electrode section (E2).

[0309] The piezoelectric vibrating section 551 may include a piezoelectric element (or piezoelectric material) having piezoelectric properties (or piezoelectric effect). For example, a piezoelectric material may have the characteristic that a potential difference is generated by dielectric polarization due to a change in the relative positions of positive (+) and negative (-) ions while pressure or torsion phenomena act on its crystal structure due to an external force, and conversely, vibration is generated by an electric field due to an applied voltage. The piezoelectric vibrating section 551 may be expressed in other terms such as piezoelectric driving section, vibrating layer, piezoelectric layer, piezoelectric material layer, electroactive layer, vibrating section, piezoelectric material section, electroactive section, piezoelectric structure, inorganic material layer, or inorganic material section, but is not limited thereto.

[0310] The piezoelectric vibrating part 551 is composed of a transparent, translucent, or opaque piezoelectric material (or electroactive material), and may be transparent, translucent, or opaque. The piezoelectric vibrating part 551 may be composed of a ceramic material capable of achieving relatively high vibrations, or of a piezoelectric ceramic having a perovskite crystal structure. The perovskite crystal structure may be an oriented, plate-like structure having piezoelectric and inverse piezoelectric effects. The perovskite crystal structure is represented by the chemical formula ABO3, where the A site consists of a divalent metal element and the B site consists of a tetravalent metal element. For example, in the chemical formula ABO3, the A and B sites may be cations, and O may be an anion. For example, perovskite crystal structures may include, but are not limited to, at least one of PbTiO3, PbZrO3, PbZrTiO3, BaTiO3, and SrTiO3.

[0311] The piezoelectric vibrating part 551 according to one embodiment of this specification may include, but is not limited to, a PZT (lead zirconate titanate) system material containing lead (Pb), zirconium (Zr), and titanium (Ti), or a PZNN (lead zirconate nickel niobate) system material containing lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb). Alternatively, the piezoelectric vibrating part 551 may include, but is not limited to, at least one of CaTiO3, BaTiO3, and SrTiO3 that do not contain lead (Pb).

[0312] The piezoelectric vibrating section 551 according to one embodiment of this specification may be configured in a circular, elliptical, or polygonal shape, but is not limited thereto.

[0313] The first electrode portion (E1) is positioned on the first surface (or top surface) of the piezoelectric vibrator 551 and can be electrically connected to the first surface of the piezoelectric vibrator 551. For example, the first electrode portion (E1) may have the shape of a single electrode (or common electrode) positioned across the entire first surface of the piezoelectric vibrator 551. For example, the first electrode portion (E1) may have the same shape as the piezoelectric vibrator 551, but is not limited thereto. The first electrode portion (E1) according to one embodiment of this specification may consist of a transparent conductive material, a translucent conductive material, or an opaque conductive material. For example, the transparent or translucent conductive material may include, but is not limited to, ITO (indium tin oxide) or IZO (indium zinc oxide). The opaque conductive material may include, but is not limited to, aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), or magnesium (Mg), or alloys thereof.

[0314] The second electrode portion (E2) is positioned on the second surface (or back surface) of the piezoelectric vibrator 551 opposite to the first surface and can be electrically connected to the second surface of the piezoelectric vibrator 551. For example, the second electrode portion (E2) may have the shape of a single electrode (or common electrode) positioned across the entire second surface of the piezoelectric vibrator 551. For example, the second electrode portion (E2) may have the same shape as the piezoelectric vibrator 551 while being larger in size than the piezoelectric vibrator 551, but is not limited thereto. The second electrode portion (E2) in the embodiments of this specification may consist of a transparent conductive material, a translucent conductive material, or an opaque conductive material. For example, the second electrode portion (E2) may consist of the same material as the first electrode portion (E1), but is not limited thereto. As another example, the second electrode portion (E2) may be made of a different material than the first electrode portion (E1).

[0315] The piezoelectric vibrating unit 551 can be polarized by a constant voltage applied to the first electrode unit (E1) and the second electrode unit (E2) in a constant temperature atmosphere or a temperature atmosphere changing from high temperature to room temperature, but is not limited to this. For example, the piezoelectric vibrating unit 551 can vibrate by alternately or repeatedly contracting and expanding due to the inverse piezoelectric effect caused by an acoustic signal (or voice signal) applied to the first electrode unit (E1) and the second electrode unit (E2) from the outside.

[0316] Each of the first vibration generator 550 and the second vibration generator 570 according to one embodiment of this specification may further include a first protective member and a second protective member.

[0317] The first protective member can be placed on the first electrode portion (E1) to protect the first electrode portion (E1). For example, the first protective member may be made of plastic, fiber, or wood, but is not limited to these materials.

[0318] The second protective member can be positioned on the second electrode portion (E2) to protect the second electrode portion (E2). For example, the second protective member may be made of plastic, fiber, or wood, but is not limited to these materials. For example, the first protective member may be made of the same material as the second protective member or of other materials. One of the first and second protective members may be attached to or bonded to the display panel via an adhesive member.

[0319] Figure 22 is a diagram illustrating a vibration generator according to another embodiment of this specification, which illustrates the first and second vibration generators shown in Figures 17 to 20.

[0320] Referring to Figure 22, the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification can be represented as, but are not limited to, a flexible vibration generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a film actuator, a film-type piezoelectric composite actuator, a film speaker, a film-type piezoelectric speaker, or a speaker of a film-type piezoelectric composite.

[0321] Each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification may include a piezoelectric vibration section 553, a first electrode section (E1), and a second electrode section (E2).

[0322] The piezoelectric vibrating section 553 may include at least one of a piezoelectric material, a composite piezoelectric material, or an electroactive material that exhibits a piezoelectric effect. The piezoelectric vibrating section 553 may be described in other terms such as piezoelectric drive section, vibrating layer, piezoelectric layer, piezoelectric material layer, electroactive layer, vibrating section, piezoelectric material section, electroactive section, piezoelectric structure, piezoelectric composite layer, piezoelectric composite, or piezoelectric ceramic composite. The piezoelectric vibrating section 553 is composed of a transparent, translucent, or opaque piezoelectric material, and may be transparent, translucent, or opaque.

[0323] The piezoelectric vibrator 553 according to the embodiments of this specification may include a plurality of first parts 553a and a plurality of second parts 553b. For example, the plurality of first parts 553a and a plurality of second parts 553b may be arranged alternately along a first direction (X) (or a second direction (Y)). For example, the first direction (X) may be the lateral direction of the piezoelectric vibrator 553. The second direction (Y) may be the longitudinal direction of the piezoelectric vibrator 553 intersecting the first direction (X). However, the first direction (X) may be the longitudinal direction of the piezoelectric vibrator 553 and the second direction (Y) may be the lateral direction of the piezoelectric vibrator 553.

[0324] Each of the multiple first parts 553a may consist of an inorganic material portion. The inorganic material portion may include the piezoelectric material described above. For example, each of the multiple first parts 553a may consist of substantially the same piezoelectric material as the piezoelectric vibrating part 551 described in Figure 21, so a redundant explanation of this is omitted.

[0325] Each of the plurality of first parts 553a according to the embodiments herein may be positioned between a plurality of second parts 553b. For example, each of the plurality of first parts 553a may have a length parallel to the second direction (Y) (or first direction (X)) while having a first width (W1) parallel to the first direction (X) (or second direction (Y)). Each of the plurality of second parts 553b may have a length parallel to the second direction (Y) (or first direction (X)) while having a second width (W2) parallel to the first direction (X) (or second direction (Y)). The first width (W1) may be the same as or different from the second width (W2). For example, the first parts 553a and the second parts 553b may include line shapes or stripe shapes having the same or different sizes from each other. Therefore, the piezoelectric vibrator 553 can have a resonant frequency of 20 kHz or less by having a 2-2 composite, but is not limited to this, and the resonant frequency of the piezoelectric vibrator 553 can be changed based on at least one of the following: shape, length, and thickness.

[0326] In the piezoelectric vibrator 553, each of the plurality of first portions 553a and the plurality of second portions 553b may be arranged side by side with each other in the same plane (or on the same layer). Each of the plurality of second portions 553b may be connected to or bonded to two adjacent first portions 553a. For example, each of the plurality of second portions 553b may be connected to or bonded to an adjacent first portion 553a by being configured to fill the gap between two adjacent first portions 553a. This allows the piezoelectric vibrator 553 to be expanded to a desired size or length by the lateral connection (or bonding) of the first portions 553a and the second portions 553b.

[0327] In the piezoelectric vibrating section 553, the width (W2) of each of the multiple second sections 553b can be gradually reduced from the middle section of the piezoelectric vibrating section 553 towards both edges (or both ends).

[0328] In embodiments of this specification, the second portion 553b having the largest width (W2) among the plurality of second portions 553b can be located at the portion where the greatest stress is concentrated when the piezoelectric vibrating portion 553 vibrates in the vertical direction (Z) (or thickness direction). The second portion 553b having the smallest width (W2) among the plurality of second portions 553b can be located at the portion where the relatively smallest stress is generated when the piezoelectric vibrating portion 553 vibrates in the vertical direction (Z). For example, the second portion 553b having the largest width (W2) among the plurality of second portions 553b can be located in the middle portion of the piezoelectric vibrating portion 553. The second portion 553b having the smallest width (W2) among the plurality of second portions 553b can be located at both edges of the piezoelectric vibrating portion 553. This minimizes the interference or superposition of resonant frequencies of sound waves that occur at the point where the greatest stress is concentrated when the piezoelectric vibrating part 553 vibrates in the vertical direction (Z). This improves the sound pressure drop (dipping) phenomenon that occurs in the low-frequency range and improves the flatness of the acoustic characteristics in the low-frequency range. For example, the flatness of the acoustic characteristics can be the magnitude of the deviation between the highest and lowest sound pressure levels.

[0329] In the piezoelectric vibrating section 553, each of the multiple first sections 553a can have a different size (or width). For example, the size (or width) of each of the multiple first sections 553a can gradually decrease or increase from the middle section to both edges (or both ends) of the piezoelectric vibrating section 553. In this case, the piezoelectric vibrating section 553 can have improved sound pressure characteristics due to the various natural vibration frequencies caused by the vibration of each of the multiple first sections 553a having different sizes, and the reproduction bandwidth of the sound can be expanded.

[0330] Each of the multiple second parts 553b may be positioned between the multiple first parts 553a. This allows the piezoelectric vibrator 553 to have increased vibrational energy due to the links in the unit cell of the first parts 553a by the second parts 553b, thereby improving its vibrational properties and ensuring piezoelectric properties and flexibility. For example, the second parts 553b may be one or more of epoxy polymers, acrylic polymers, and silicon polymers.

[0331] The second part 553b according to the embodiments of this specification may consist of an organic material part. For example, by being placed between inorganic material parts, the organic material part can absorb the impact applied to the inorganic material part (or the first part), relieve the stress concentrated in the inorganic material part, improve the durability of the piezoelectric vibration part 553, and provide flexibility to the piezoelectric vibration part 553 or the first vibration generator 550.

[0332] The second part 553b according to the embodiments of this specification can have a lower modulus of elasticity and viscoelasticity compared to the first part 553a, thereby improving the reliability of the first part 553a, which is susceptible to impact due to its brittle properties. For example, the second part 553b may consist of a material having a loss coefficient of 0.01 to 1 and an elastic modulus of 0.1 to 10 [GPa].

[0333] The organic material portion comprising the second part 553b may include an organic material, organic polymer, organic piezoelectric material, or organic non-piezoelectric material having more flexible properties compared to the inorganic material portion of the first part 553a. For example, the second part 553b can be represented as a flexible adhesive portion, expandable portion, bendable portion, damping portion, or ductile portion, and is not limited thereto.

[0334] The piezoelectric vibrator 553 according to the embodiments of this specification can have the shape of a single thin film by arranging (or connecting) a plurality of first parts 553a and second parts 553b on the same plane. For example, the piezoelectric vibrator 553 can have a structure in which a plurality of first parts 553a are connected on one side. For example, a plurality of first parts 553a can have a structure in which they are connected throughout the piezoelectric vibrator 553. For example, the piezoelectric vibrator 553 can vibrate vertically by the first parts 553a which have vibration characteristics, and can bend into a curved shape by the second parts 553b which have flexibility. Furthermore, in the piezoelectric vibrator 553 according to the embodiments of this specification, the size of the first part 553a and the size of the second part 553b can be configured according to the piezoelectric characteristics and flexibility required for the piezoelectric vibrator 553. In one embodiment, in the case of a piezoelectric vibrator 553 in which piezoelectric characteristics are required more than flexibility, the size of the first part 553a can be configured to be larger than the size of the second part 553b. In another example, in the case of a piezoelectric vibrator 553 that requires flexibility rather than piezoelectric properties, the size of the second part 553b can be made larger than the size of the first part 553a. Therefore, since the size of the piezoelectric vibrator 553 can be adjusted according to the required characteristics, there is an advantage in that the design of the piezoelectric vibrator 553 is easy.

[0335] The first electrode portion (E1) may be positioned on the first surface (or top surface) of the piezoelectric vibrator 553. The first electrode portion (E1) may be positioned in common with or coupled to the first surfaces of each of the plurality of first portions 553a and each of the plurality of second portions 553b, and may be electrically connected to the first surfaces of each of the plurality of first portions 553a. For example, the first electrode portion (E1) may have the shape of a single electrode (or common electrode) positioned across the entire first surface of the piezoelectric vibrator 553. For example, the first electrode portion (E1) may, but is not limited to, have substantially the same shape as the piezoelectric vibrator 553. The first electrode portion (E1) according to the embodiments herein may consist of a transparent conductive material, a translucent conductive material, or an opaque conductive material.

[0336] The second electrode portion (E2) may be positioned on the second surface (or back surface) of the piezoelectric vibrator 553 opposite to the first surface. The second electrode portion (E2) may be positioned in common with or coupled to the second surfaces of each of the multiple first portions 553a and each of the multiple second portions 553b, and may be electrically connected to the second surfaces of each of the multiple first portions 553a. The second electrode portion (E2) may have a single electrode (or common electrode) shape positioned across the entire second surface of the piezoelectric vibrator 553. For example, the second electrode portion (E2) may, but is not limited to, have the same shape as the piezoelectric vibrator 553. The second electrode portion (E2) according to the embodiments herein may consist of a transparent conductive material, a translucent conductive material, or an opaque conductive material.

[0337] The piezoelectric vibrator 553 can be polarized by a constant voltage applied to the first electrode (E1) and the second electrode (E2) in a constant temperature atmosphere or a temperature atmosphere changing from high temperature to room temperature, but is not limited to this. For example, the piezoelectric vibrator 553 can vibrate by repeatedly contracting and expanding alternately due to the inverse piezoelectric effect caused by an acoustic signal (or voice signal) applied to the first electrode (E1) and the second electrode (E2) from the outside. For example, the piezoelectric vibrator 553 can vibrate by vertical vibration (d33) and planar vibration (d31) by the first electrode (E1) and the second electrode (E2). The piezoelectric vibrator 553 can increase the displacement of the display panel by contracting and expanding in the planar direction, thereby further improving the vibration.

[0338] Each of the first vibration generator 550 and the second vibration generator 570 according to the embodiments of this specification may further include a first protective member and a second protective member.

[0339] The first protective member is positioned on the first electrode portion (E1) and can protect the first electrode portion (E1). For example, the first protective member may be made of plastic, fiber, or wood, but is not limited to these materials.

[0340] The second protective member is positioned on the second electrode portion (E2) and can protect the second electrode portion (E2). For example, the second protective member may be made of plastic, fiber, or wood, but is not limited thereto. For example, the first protective member may be made of the same material as the second protective member or of other materials. One of the first and second protective members may be attached to or bonded to the display panel via an adhesive.

[0341] Figure 23 shows a vibration generator according to another embodiment of this specification, which is a modification of the piezoelectric vibration unit described in Figure 22. Accordingly, in the following description, redundant explanations of the remaining components excluding the piezoelectric vibration unit will be omitted or simplified.

[0342] Referring to Figure 23, in each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification, the piezoelectric vibration unit 553 may include a plurality of first parts 553a spaced apart from each other along a first direction (X) and a second direction (Y), and a second part 553b positioned between the plurality of first parts 553a.

[0343] Each of the multiple first parts 553a may be arranged so as to be spaced apart from one another along the first direction (X) and the second direction (Y). For example, each of the multiple first parts 553a may be arranged in a lattice shape, having a hexahedral form with the same size as each other. Each of the multiple first parts 553a may be made of substantially the same piezoelectric material as the first part 553a described in Figure 22, so the same reference numerals are assigned to them and redundant explanations are omitted.

[0344] The second portion 553b may be positioned between multiple first portions 553a along the first direction (X) and the second direction (Y). The second portion 553b may be connected to or bonded to adjacent first portions 553a by filling the gap between two adjacent first portions 553a or by being configured to surround each of the multiple first portions 553a. In the embodiments herein, the width of a second portion 553b positioned between two adjacent first portions 553a along the first direction (X) may be the same as or different from the width of a first portion 553a. The width of a second portion 553b positioned between two adjacent first portions 553a along the second direction (Y) may be the same as or different from the width of a first portion 553a. Since multiple second portions 553b may consist of substantially the same organic material as the second portion 553b described in Figure 22, they are given the same reference numerals and redundant descriptions are omitted.

[0345] Thus, the piezoelectric vibration section 553 of the first vibration generator 550 and the second vibration generator 570 according to the embodiments of this specification can have a resonant frequency of 30 MHz or less by including the 1-3 composite, but is not limited thereto, and the resonant frequency of the piezoelectric vibration section 553 can be changed based on at least one of the following: shape, length, and thickness.

[0346] Figure 24 shows a vibration generator according to another embodiment of this specification, which is a modification of the piezoelectric vibration unit described in Figure 22. Accordingly, in the following description, redundant explanations of the remaining components excluding the piezoelectric vibration unit will be omitted or simplified.

[0347] Referring to Figure 24, in each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification, the piezoelectric vibration unit 553 may include a plurality of first parts 553a spaced apart from each other along a first direction (X) and a second direction (Y), and a second part 553b positioned between the plurality of first parts 553a.

[0348] Each of the multiple first parts 553a in the embodiments of this specification may have a circular planar structure. For example, each of the multiple first parts 553a may have a disc shape, but is not limited thereto. For example, each of the multiple first parts 553a may have a point shape including an ellipse, polygon, or donut shape.

[0349] The second portion 553b may be positioned between multiple first portions 553a along the first direction (X) and the second direction (Y). The second portion 553b may be connected to or bonded to each of the multiple first portions 553a by being configured to surround each of them. Each of the multiple first portions 553a and the second portion 553b may be positioned (or arranged) side by side with each other in the same plane (or on the same layer).

[0350] In the piezoelectric vibrators 553 of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification, each of the plurality of first portions 553a may have a triangular planar structure instead of a circular planar structure. For example, each of the plurality of first portions 553a may have the shape of a triangular plate.

[0351] In embodiments of this specification, four adjacent first parts 553a may be arranged adjacently to each other to form a quadrilateral (or square) shape. Each vertex of the four adjacent first parts 553a forming the quadrilateral shape may be located adjacent to the center (or true center) of the quadrilateral.

[0352] In other examples relating to this specification, among a plurality of first parts 553a, six adjacent first parts 553a may be arranged adjacently to form a hexagon (or regular hexagon). Each vertex of the six adjacent first parts 553a forming a hexagon may be arranged adjacent to the center (or true center) of the hexagon.

[0353] Figure 25 shows a vibration generator according to another embodiment of this specification, and Figure 26 is a cross-sectional view of the line VI-VI' shown in Figure 25, which shows the vibration generator shown in Figures 17 to 20.

[0354] Referring to Figures 25 and 26, each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification may include at least one vibration generating unit (or vibration module) 550A, 550B, 550C, 550D, or a plurality of vibration generating units 550A, 550B, 550C, 550D. Figures 25 and 26 show, as an example, that each of the first vibration generator 550 and the second vibration generator 570 includes four vibration generating units, and each of the first vibration generator 550 and the second vibration generator 570 according to embodiments of this specification may consist of two or more vibration generating modules.

[0355] Each of the multiple vibration generating units 550A, 550B, 550C, and 550D can be electrically isolated from each other while being spaced apart along the first direction (X) and the second direction (Y), respectively.

[0356] Each of the multiple vibration generating units 550A, 550B, 550C, and 550D can vibrate by alternately or repeatedly contracting and expanding due to the piezoelectric effect. For example, each of the multiple vibration generating units 550A, 550B, 550C, and 550D can be arranged at regular intervals along the first direction (X) and the second direction (Y), respectively, or tiled. Thus, each of the first vibration generator 550 and the second vibration generator 570, in which the multiple vibration generating units 550A, 550B, 550C, and 550D are tiled, can be a vibration array, a vibration array section, a vibration generating unit array section, a vibration array structure, a tiled vibration array, a tiled array module, or a tiled vibration film.

[0357] Each of the multiple vibration generating units 550A, 550B, 550C, and 550D according to the embodiments of this specification may have a rectangular shape. For example, each of the multiple vibration generating units 550A, 550B, 550C, and 550D may have a rectangular shape with a width of 5 cm or more. For example, each of the multiple vibration generating units 550A, 550B, 550C, and 550D may have a square shape with dimensions of 5 cm x 5 cm or more, but is not limited thereto.

[0358] Each of the multiple vibration generating units 550A, 550B, 550C, and 550D can be arranged at regular intervals or tiled together to be implemented as a single vibrating device (or single vibrating device) that is driven not independently but as a complete single unit. In the embodiments of this specification, the first separation distance (D1) between the multiple vibration generating units 550A, 550B, 550C, and 550D with respect to a first direction (X) may be, but not limited to, 0.1 mm or more and less than 3 cm. Similarly, the second separation distance (D2) between the multiple vibration generating units 550A, 550B, 550C, and 550D with respect to a second direction (Y) may be, but not limited to, 0.1 mm or more and less than 3 cm. For example, the first separation distance (D1) and the second separation distance (D2) can be the same as each other within the range of process tolerance.

[0359] Each of the multiple vibration generating units 550A, 550B, 550C, and 550D can be arranged or tiled to have a separation distance (or spacing) (D1, D2) of 0.1 mm or more and less than 3 cm, thereby being driven as a single vibration device, and the reproduction frequency band and sound pressure characteristics of the sound generated in conjunction with the single-body vibration of such vibration generating units 550A, 550B, 550C, and 550D can be increased. For example, in order to increase the reproduction frequency band of the sound generated in conjunction with the single-body vibration of the multiple vibration generating units 550A, 550B, 550C, and 550D, and to increase the sound pressure characteristics in the low-frequency range, for example, below 500 Hz, the multiple vibration generating units 550A, 550B, 550C, and 550D can be arranged at intervals of 0.1 mm or more and less than 5 mm.

[0360] In the embodiments of this specification, when a plurality of vibration generating units 550A, 550B, 550C, and 550D are arranged with an interval of less than 0.1 mm (D1, D2) or without an interval (D1, D2), the reliability of each of the vibration generating units 550A, 550B, 550C, and 550D, or the first vibration generator 550 and the second vibration generator 570, may be reduced due to crack formation or damage caused by physical contact between them during the vibration of each vibration generating unit 550A, 550B, 550C, and 550D.

[0361] In the embodiments of this specification, when multiple vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals of 3 cm or more (D1, D2), the independent vibrations of each of the multiple vibration generating units 550A, 550B, 550C, and 550D may prevent them from being driven as a single vibration device. As a result, the reproduction frequency range and sound pressure characteristics of the sound generated in conjunction with the vibrations of the multiple vibration generating units 550A, 550B, 550C, and 550D may be reduced. For example, when multiple vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals of 3 cm or more (D1, D2), the acoustic characteristics and sound pressure characteristics in the low-frequency range, for example, below 500 Hz, may be reduced.

[0362] In the embodiments of this specification, when multiple vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals of 5 mm, each of the multiple vibration generating units 550A, 550B, 550C, and 550D does not operate as a single vibration device, so both the acoustic characteristics and sound pressure characteristics may deteriorate in the low-frequency range, for example, below 200 Hz.

[0363] In another example relating to this specification, when multiple vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals of 1 mm, the vibration of the multiple vibration generating units 550A, 550B, 550C, and 550D as a single vibrating device can increase the acoustic reproduction bandwidth and improve the sound pressure characteristics in the low-frequency range, for example, below 500 Hz. For example, when multiple vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals of 1 mm, each of the first vibration generator 550 and the second vibration generator 570 can be realized as a large-area vibrating body by optimizing the spacing distance between the multiple vibration generating units 550A, 550B, 550C, and 550D. This allows the multiple vibration generating units 550A, 550B, 550C, and 550D to be driven as a large-area vibrating body through single-body vibration, thereby increasing or improving the acoustic characteristics and sound pressure characteristics of the sound reproduction band, low-frequency range, etc., generated in conjunction with the large-area vibrations of the first vibration generator 550 and the second vibration generator 570, respectively.

[0364] Therefore, in order to realize single-body vibration (or a single vibration device) of multiple vibration generating units 550A, 550B, 550C, and 550D, the separation distance between the multiple vibration generating units 550A, 550B, 550C, and 550D can be set to 0.1 mm or more and less than 3 cm. Furthermore, in order to realize single-body vibration (or a single vibration device) of multiple vibration generating units 550A, 550B, 550C, and 550D and to increase the sound pressure characteristics of low-frequency sound, the separation distance between the multiple vibration generating units 550A, 550B, 550C, and 550D can be set to 0.1 mm or more and 5 mm or less.

[0365] Each of the first vibration generator 550 and the second vibration generator 570 according to the embodiments of this specification may include first to fourth vibration generating units 550A, 550B, 550C, and 550D that are electrically separated from each other while being spaced apart along the first direction (X) and the second direction (Y), respectively. For example, the first to fourth vibration generating units 550A, 550B, 550C, and 550D may be arranged or tiled in a 2x2 configuration.

[0366] In the embodiments of this specification, the first and second vibration generating units 550A and 550B may be separated from each other along a first direction (X). The third and fourth vibration generating units 550C and 550D may be separated from each other along a second direction (Y) while being separated from each other along a first direction (X). The first and third vibration generating units 550A and 550C may face each other and be separated from each other along a second direction (Y). The second and fourth vibration generating units 550B and 550D may face each other and be separated from each other along a second direction (Y).

[0367] Each of the first to fourth vibration generating units 550A, 550B, 550C, and 550D according to the embodiments of this specification may include a piezoelectric vibration unit 353, a first electrode unit (E1), and a second electrode unit (E2).

[0368] The piezoelectric vibrator 353 may be composed of a ceramic-based material capable of achieving relatively high vibrations. For example, the piezoelectric vibrator 353 may have a 1-3 composite structure having piezoelectric properties of 1-3 vibration modes, or a 2-2 composite structure having piezoelectric properties of 2-2 vibration modes. For example, the piezoelectric vibrator 353 may include a piezoelectric ceramic, similar to the piezoelectric vibrator 553 described in Figure 21, or it may include a first part 553a and a second part 553b, similar to the piezoelectric vibrator 553 described in one of Figures 22 to 24. Therefore, the same reference numerals are assigned to these parts, and redundant explanations are omitted.

[0369] In the embodiments of this specification, the piezoelectric vibrator 353 is composed of a transparent, translucent, or opaque piezoelectric material, and may be transparent, translucent, or opaque.

[0370] The first electrode portion (E1) is positioned on the first surface of the piezoelectric vibrator 353 and can be electrically connected to the first surface of the piezoelectric vibrator 353. This is the same as the first electrode portion (E1) described in one of Figures 21 to 24, so the same reference numeral is used, and redundant explanations are omitted.

[0371] The second electrode portion (E2) is positioned on the second surface of the piezoelectric vibrator 353 and can be electrically connected to the second surface of the piezoelectric vibrator 353. This is the same as the second electrode portion (E2) described in one of Figures 21 to 24, so the same reference numeral is used, and redundant explanations are omitted.

[0372] Each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification may further include a first protective member 556 and a second protective member 557.

[0373] The first protective member 556 can be positioned on the respective first surfaces of the first vibration generator 550 and the second vibration generator 570. For example, the first protective member 556 can be connected to the respective first surfaces of the multiple vibration generating units 550A, 550B, 550C, and 550D by covering the first electrode portion (E1) positioned on the respective first surfaces of the multiple vibration generating units 550A, 550B, 550C, and 550D, or can commonly support the respective first surfaces of the multiple vibration generating units 550A, 550B, 550C, and 550D. As a result, the second protective member 557 can protect the respective first surfaces or first electrode portion (E1) of the multiple vibration generating units 550A, 550B, 550C, and 550D.

[0374] The first protective member 556 according to the embodiments of this specification may be placed on the first surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D via a first adhesive layer 554. For example, the first protective member 556 may be placed directly on the first surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D by a film lamination process mediated by the first adhesive layer 554. Therefore, the multiple vibration generating parts 550A, 550B, 550C, and 550D may be integrated (or placed) on the first protective member 556 or tiled so as to have a certain interval (D1, D2).

[0375] The second protective member 557 may be positioned on the second surfaces of the first vibration generator 550 and the second vibration generator 570, respectively. For example, the second protective member 557 can be connected in common to the second surfaces of the multiple vibration generating units 550A, 550B, 550C, and 550D, or can commonly support the second surfaces of the multiple vibration generating units 550A, 550B, 550C, and 550D, by covering the second electrode portion (E2) positioned on the second surfaces of the multiple vibration generating units 550A, 550B, 550C, and 550D. In this way, the second protective member 557 can protect the second surfaces or second electrode portion (E2) of the multiple vibration generating units 550A, 550B, 550C, and 550D, respectively.

[0376] The second protective member 557 according to the embodiments of this specification may be positioned on the second surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D via a second adhesive layer 555. For example, the second protective member 557 may be positioned directly on the second surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D by a film lamination process mediated by the second adhesive layer 555. Therefore, the multiple vibration generating parts 550A, 550B, 550C, and 550D may be integrated (or positioned) on the second protective member 557 or tiled so as to have a certain interval (D1, D2).

[0377] Each of the first and second protective members 556 and 557 in the embodiments of this specification may be, but is not limited to, made of plastic, fiber, or wood. One of the first protective member 556 and the second protective member 557 may be attached to or bonded to the display panel via an adhesive.

[0378] The first adhesive layer 554 can be placed on the first surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D, and between the multiple vibration generating parts 550A, 550B, 550C, and 550D. For example, the first adhesive layer 554 can be formed on the back surface (or inner surface) of the first protective member 556 facing the first surfaces of the first vibration generator 550 and the second vibration generator 570, and placed on the first surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D, and filled between the multiple vibration generating parts 550A, 550B, 550C, and 550D.

[0379] The second adhesive layer 555 can be placed between the second surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D and between the multiple vibration generating parts 550A, 550B, 550C, and 550D. For example, the second adhesive layer 555 can be formed on the front (or inner) surface of the second protective member 557 facing the second surfaces of each of the first vibration generator 550 and the second vibration generator 570, and placed between the second surfaces of each of the multiple vibration generating parts 550A, 550B, 550C, and 550D, and filled between the multiple vibration generating parts 550A, 550B, 550C, and 550D.

[0380] The first and second adhesive layers 554 and 555 can be connected to or joined to each other between a plurality of vibration generating parts 550A, 550B, 550C, and 550D. This allows each of the plurality of vibration generating parts 550A, 550B, 550C, and 550D to be surrounded by the first and second adhesive layers 554 and 555. For example, the first and second adhesive layers 554 and 555 can completely enclose the entire plurality of vibration generating parts 550A, 550B, 550C, and 550D. For example, the first and second adhesive layers 554 and 555 can be represented by cover members, and are not limited to these. When the first and second adhesive layers 554 and 555 are cover members, the first protective member 556 may be positioned on the first surface of the cover member, and the second protective member 557 may be positioned on the second surface of the cover member.

[0381] Each of the first and second adhesive layers 554, 555 in the embodiments of this specification may contain an electrically insulating material that is compressible and resilient while being adhesive. For example, each of the first and second adhesive layers 554, 555 may contain, but is not limited to, an epoxy resin, an acrylic resin, a silicone resin, or a urethane resin. For example, each of the first and second adhesive layers 554, 555 may be configured to be transparent, translucent, or opaque.

[0382] Each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification may further include a first power supply line (PL1) located on the first protective member 556, a second power supply line (PL2) located on the second protective member 557, and a pad portion 558 electrically connected to the first power supply line (PL1) and the second power supply line (PL2).

[0383] The first power supply line (PL1) may be positioned on the back of the first protective member 556 facing the first surfaces of the first vibration generator 550 and the second vibration generator 570, respectively. The first power supply line (PL1) may be electrically connected to the first electrode portion (E1) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D. For example, the first power supply line (PL1) may be directly electrically connected to the first electrode portion (E1) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D. In one embodiment, the first power supply line (PL1) may be electrically connected to the first electrode portion (E1) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D via an anisotropic conductive film. In another embodiment, the first power supply line (PL1) may be electrically connected to the first electrode portion (E1) of each of the multiple vibration generating portions 550A, 550B, 550C, and 550D via a conductive material (or particles) contained in the first adhesive layer 554.

[0384] The first power supply line (PL1) according to the embodiments of this specification may include first and second upper power lines (PL11, PL12) arranged along a second direction (Y). For example, the first upper power line (PL11) may be electrically connected to the first electrode portion (E1) of each of the first and third vibration generating units 550A, 550C (or first group, first module group, or first array group) from among a plurality of vibration generating units 550A, 550B, 550C, 550D, which are arranged in a first row parallel to the second direction (Y). The second upper power line (PL12) may be electrically connected to the first electrode portion (E1) of each of the second and fourth vibration generating units 550B, 550D (or second group, second module group, or second array group) from among a plurality of vibration generating units 550A, 550B, 550C, 550D, which are arranged in a second row parallel to the second direction (Y).

[0385] The second power supply line (PL2) may be positioned in front of the second protective member 557 facing the second surfaces of the first vibration generator 550 and the second vibration generator 570, respectively. The second power supply line (PL2) may be electrically connected to the second electrode portion (E2) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D. For example, the second power supply line (PL2) may be directly electrically connected to the second electrode portion (E2) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D. In one embodiment, the second power supply line (PL2) may be electrically connected to the second electrode portion (E2) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D via an anisotropic conductive film. In another embodiment, the second power supply line (PL2) may be electrically connected to the second electrode portion (E2) of each of the multiple vibration generating portions 550A, 550B, 550C, and 550D via a conductive material (or particles) contained in the second adhesive layer 555.

[0386] The second power supply line (PL2) according to the embodiments of this specification may include first and second lower power lines (PL21, PL22) arranged along a second direction (Y). For example, the first lower power line (PL21) may be electrically connected to the second electrode portion (E2) of each of the first and third vibration generating units 550A, 550C (or first group, first module group, or first array group) from among a plurality of vibration generating units 550A, 550B, 550C, 550D, which are arranged in a first row parallel to the second direction (Y). The second lower power line (PL22) may be electrically connected to the second electrode portion (E2) of each of the second and fourth vibration generating units 550B, 550D (or second group, second module group, or second array group) from among a plurality of vibration generating units 550A, 550B, 550C, 550D, which are arranged in a second row parallel to the second direction (Y).

[0387] The pad portion 558 may be positioned on the first vibration generator 550 and the second vibration generator 570 so as to be electrically connected to at least one side (or end) of the first power supply line (PL1) and the second power supply line (PL2). The pad portion 558 according to the embodiments herein may include a first pad electrode electrically connected to one end of the first power supply line (PL1) and a second pad electrode electrically connected to one end of the second power supply line (PL2).

[0388] The first pad electrode may be connected in common to one end each of the first and second upper power lines (PL11, PL12) of the first power supply line (PL1). For example, one end each of the first and second upper power lines (PL11, PL12) may branch off from the first pad electrode.

[0389] The second pad electrode may be connected in common to one end each of the first and second lower power lines (PL21, PL22) of the second power supply line (PL2). For example, one end each of the first and second lower power lines (PL21, PL22) may be branched from the second pad electrode.

[0390] In the embodiments of this specification, the first power supply line (PL1), the second power supply line (PL2), and the pad portion 558 can each be made of a transparent conductive material, a translucent conductive material, or an opaque conductive material, so as to be transparent, translucent, or opaque.

[0391] Each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of this specification may further include a flexible cable 559.

[0392] The flexible cable 559 is electrically connected to the pad portions 5 located in the first vibration generator 550 and the second vibration generator 570, respectively, and can supply vibration drive signals (or acoustic signals) provided from the acoustic processing circuit to the first vibration generator 550 and the second vibration generator 570, respectively. The flexible cable 559 according to the embodiments herein may include a first terminal electrically connected to a first pad electrode of the pad portion 558, and a second terminal electrically connected to a second pad electrode of the pad portion 558. For example, the flexible cable 559 may be, but is not limited to, a flexible printed circuit cable or a flexible flat cable.

[0393] The acoustic processing circuit can generate AC-type vibration drive signals, including a first vibration drive signal and a second vibration drive signal, based on an acoustic source. The first vibration drive signal is either a positive (+) or negative (-) vibration drive signal, and the second vibration drive signal may also be either a positive (+) or negative (-) vibration drive signal. For example, the first vibration drive signal can be supplied to the first electrode section (E1) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D via the first terminal of the flexible cable 559, the first pad electrode of the pad section 558, and the first power supply line (PL1). The second vibration drive signal can be supplied to the second electrode section (E2) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D via the second terminal of the flexible cable 559, the second pad electrode of the pad section 558, and the second power supply line (PL2).

[0394] In the embodiments of this specification, the flexible cable 559 may be configured to be transparent, translucent, or opaque.

[0395] Thus, each of the first vibration generator 550 and the second vibration generator 570 in this embodiment includes a plurality of vibration generating units 550A, 550B, 550C, and 550D arranged (or tiled) at regular intervals (D1, D2) so as to be realized as a single vibrating body without being driven independently. As a result, the plurality of vibration generating units 550A, 550B, 550C, and 550D can be driven as a large-area vibrating body through the individual vibrations of each unit. This allows a large area of ​​the display panel to be vibrated, or the display panel itself to vibrate a large area, thereby improving or enhancing the acoustic characteristics and sound pressure characteristics in the playback frequency band and low-frequency range of the sound output from the display panel.

[0396] Figure 27 shows a modified example of the variable curvature device in the display device according to this specification, which is a modification of the arc member and linear drive unit shown in Figures 4 to 6, 14, and 15, respectively. Accordingly, in the following description, the same reference numerals are used for the remaining components excluding the arc member and linear drive unit, and redundant explanations are omitted or simplified.

[0397] Referring to Figure 27, in the variable curvature device 200 according to a modified example of this specification, the arc member 210 may include a first arc member 211 and a second arc member 213.

[0398] The first arc member 211 may be positioned in the first rear region (RA1) of the display unit 100 parallel to the first direction (X). The first arc member 211 may have a curved shape. The first arc member 211 may have a curved shape that is convex toward the center of the rear surface of the display unit 100. The center (or lengthwise center) of the first arc member 211 may be adjacent to the center of the rear surface of the display unit 100, and both ends (or both sides) of the first arc member 211 may be adjacent to the upper left and right corners where the first short side, the second short side, and the first long side connect from the display unit 100. For example, one end (or first end) of the first arc member 211 may be adjacent to the upper right corner of the display unit 100, and the other end (or second end) of the first arc member 211 may be adjacent to the upper left corner of the display unit 100.

[0399] The second arc member 213 may be positioned in the second rear region (RA2) of the display unit 100 parallel to the first direction (X). The second arc member 213 may have a curved shape. The second arc member 213 may have a curved shape that is convex toward the center of the rear surface of the display unit 100. The center (or lengthwise center) of the second arc member 213 may be adjacent to the center of the rear surface of the display unit 100, and both ends (or both sides) of the second arc member 213 may be adjacent to the lower left and right corners of the display unit 100 where the first short side, the second short side, and the second long side are connected, respectively. For example, one end (or first end) of the second arc member 213 may be adjacent to the lower right corner of the display unit 100, and the other end (or second end) of the second arc member 213 may be adjacent to the lower left corner of the display unit 100.

[0400] The first arc member 211 and the second arc member 213 may be positioned on the back of the display unit 100 so as to be symmetrical to each other with respect to the intermediate region or vertical intermediate line (VCL) on the back of the display unit 100. Here, the vertical intermediate line (VCL) of the display unit 100 may be located on the center of the length of the shorter side (or vertical length) of the display unit 100.

[0401] The linear drive unit 223 is positioned on the support plate 221 and rotates the rotary link unit 224 by moving linearly due to the rotational motion of the rotary drive unit 222. The linear drive unit 223 according to one embodiment may include a first rack gear unit 223a and a second rack gear unit 223b.

[0402] As described above, the first rack gear section 223a may include a first rack gear bar, a 1-1 rack gear, and a 1-2 rack gear (RG12). Such a first rack gear section 223a is the same as the first rack gear section 223a described above, except that the 1-2 rack gear (RG12) is formed in the middle portion of the first rack gear bar at the other (or upper) end portion of the first rack gear bar so as to overlap with the center of the first arc member 211, so a redundant explanation of this will be omitted.

[0403] As described above, the second rack gear section 223b may include a second rack gear bar, a second-first rack gear, and a second-second rack gear (RG22). Such a second rack gear section 223b is the same as the second rack gear section 223b described above, except that the second-second rack gear (RG22) is formed in the middle portion of the second rack gear bar so that it overlaps with the center of the second arc member 213 at one end (or lower end) of the second rack gear bar, so a redundant explanation of this section will be omitted.

[0404] The rotating link section 224 rotates due to the linear motion of the linear drive section 223, thereby rotating the arc member 210. By rotatably fixing the rotating link section 224 to the center of the arc member 210, the linear motion of the linear drive section 223 causes the rotating link section 224 to rotate and rotate the arc member 210.

[0405] The rotating link section 224 according to one embodiment may include a first rotating link gear 224a and a second rotating link gear 224b.

[0406] The first rotating link gear 224a is fixed to the center of the first arc member 211 of the arc member 210 and rotates due to the linear motion of the first rack gear portion 223a of the linear drive unit 223, thereby allowing the first arc member 211 to rotate.

[0407] The second rotating link gear 224b is fixed to the center of the second arc member 213 of the arc member 210 and rotates due to the linear motion of the second rack gear portion 223b of the linear drive unit 223, thereby allowing the second arc member 213 to rotate.

[0408] Thus, in the display device including the variable curvature device 200 according to the modified specification, the first arc member 211 and the second arc member 213 each have a curved shape that is convex toward the center of the back of the display unit 100, thereby securing space for the intermediate region of the first back region (RA1) of the display unit 100, and thereby making assembly processes such as cable connection between the display unit 100 and the system board easier in the first back region (RA1) of the display unit 100.

[0409] Selectively, the curvature variable device 200 shown in Figure 27 can be similarly applied to the curvature variable device 200 of other examples of display devices shown in Figures 17 to 19 of this specification, so a redundant explanation of these will be omitted. For example, the arc member 210, the linear drive unit 223, and the rotating link unit 224 of the curvature variable device 200 shown in Figure 17 or Figure 19 can be replaced with the arc member 210, the linear drive unit 223, and the rotating link unit 224 of the curvature variable device 200 shown in Figure 27.

[0410] On the other hand, in the curvature variable device 200 according to this specification, the arrangement structure of the first arc member 211 and the second arc member 213 of the arc member 210 is not limited to the arrangement structures shown in Figures 6 and 27, respectively. In one embodiment, the arc member 210 may include the first arc member 211 shown in Figure 6 and the second arc member 213 shown in Figure 27. In another example, the arc member 210 may include the first arc member 211 shown in Figure 27 and the second arc member 213 shown in Figure 6.

[0411] The display device according to this specification can be described as follows.

[0412] In some embodiments of this specification, the display device includes a display panel for displaying images, a display unit including a back cover disposed on the back of the display panel, and a curvature variable device disposed on the back cover for changing the curvature of the display unit, the curvature variable device including an arc member disposed in the back region of the display unit parallel to a first direction, a support plate disposed in the back region of the display unit, a rotary drive unit disposed on the support plate, a linear drive unit disposed on the support plate and moving linearly along a second direction intersecting the first direction by the rotation of the rotary drive unit, a rotary link unit coupled to the central portion of the arc member on the support plate and rotating by the linear motion of the linear drive unit to rotate the central portion of the arc member, and a holder unit that rotatably supports the central portion of the arc member on the support plate.

[0413] In some embodiments of this specification, the arc member includes a first arc member and a second arc member, respectively, positioned in a first rear region and a second rear region of a display unit parallel to a first direction, and the rotating link portion may include a first rotating link gear coupled to the central portion of the first arc member on a support plate and rotating due to the linear motion of a linear drive unit to rotate the first arc member, and a second rotating link gear coupled to the central portion of the second arc member on a support plate and rotating due to the linear motion of a linear drive unit to rotate the second arc member.

[0414] In some embodiments of this specification, the display device includes a display unit and a variable curvature device disposed on the back of the display unit for changing the curvature of the display unit, the display unit may include a display panel for displaying an image, a back cover disposed on the back of the display panel for supporting the variable curvature device, and a groove formed recessed from the back cover superimposed on the variable curvature device for housing the variable curvature device.

[0415] In some embodiments of this specification, the display device may further include an intermediate member positioned between the back of the display panel and a groove in the back cover, which is superimposed on the variable curvature device.

[0416] In some embodiments of this specification, the variable curvature device may include an arc member positioned in the rear region of the display unit parallel to a first direction, a support plate housed in a groove of the back cover, a rotary drive unit positioned on the support plate, a linear drive unit positioned on the support plate and moving linearly along a second direction intersecting the first direction by the rotation of the rotary drive unit, a rotary link unit on the support plate that is coupled to the central portion of the arc member and rotates by the linear motion of the linear drive unit to rotate the central portion of the arc member, and a holder unit on the support plate that rotatably supports the central portion of the arc member.

[0417] In some embodiments of this specification, the arc member includes a first arc member and a second arc member, respectively, positioned in a first rear region and a second rear region of a display unit parallel to a first direction, and the rotating link portion may include a first rotating link gear coupled to the central portion of the first arc member on a support plate and rotating due to the linear motion of a linear drive unit to rotate the first arc member, and a second rotating link gear coupled to the central portion of the second arc member on a support plate and rotating due to the linear motion of a linear drive unit to rotate the second arc member.

[0418] In some embodiments of this specification, the first arc member and the second arc member each have a curved shape and can rotate in opposite directions from each other by the rotation of the rotating link portion.

[0419] In some embodiments of this specification, the first arc member and the second arc member each have a curved shape, the center of the first arc member and the center of the second arc member are located in the center of the rear region of the display, one end of the first arc member and one end of the second arc member are located on the edge of the first rear of the display, and the other end of the first arc member and the other end of the second arc member may be located on the edge of the second rear of the display.

[0420] In some embodiments of this specification, the variable curvature device further includes fixed brackets that movably support one end and the other end of a first arc member and one end and the other end of a second arc member, the fixed brackets may be positioned on the first rear edge portion and the second rear edge portion of the display.

[0421] In some embodiments of this specification, the variable curvature device may further include a first fixing bracket positioned on the edge of the first rear surface of the display and movably supporting one end of a first arc member; a second fixing bracket positioned on the edge of the second rear surface of the display and movably supporting the other end of the first arc member; a third fixing bracket positioned on the edge of the first rear surface of the display and movably supporting one end of a second arc member; and a fourth fixing bracket positioned on the edge of the second rear surface of the display and movably supporting the other end of the second arc member.

[0422] In some embodiments of this specification, the variable curvature device further includes guides positioned in the rear region of the display and movably supporting a first arc member and a second arc member, the guides being movably supported between one end and the center of the first arc member, between the other end and the center of the first arc member, between one end and the center of the second arc member, and between the other end and the center of the second arc member.

[0423] In some embodiments of this specification, the linear drive unit may include a first rack gear unit that moves linearly along a second direction by the rotational motion of the rotary drive unit to rotate a first rotary link gear, and a second rack gear unit that moves linearly along the second direction in the opposite direction to the first rack gear unit by the rotational motion of the rotary drive unit to rotate a second rotary link gear.

[0424] In some embodiments of this specification, the first rack gear section includes a first rack gear bar positioned on a support plate so as to be slidable along a second direction, a first-first rack gear connected to a rotary drive unit on one side of the first rack gear bar, and a first-second rack connected to a first rotary link gear on the other side of the first rack gear bar. The second rack gear section may include a second rack gear bar positioned on a support plate so as to be slidable along a second direction, a second-first rack gear connected to a rotary drive unit on the other side of the second rack gear bar, and a second-second rack connected to a second rotary link gear on one side of the second rack gear bar.

[0425] In some embodiments of this specification, the rotary drive unit may include at least one rotary motor, a pinion gear that causes the linear drive unit to move in a linear motion, and a rotary transmission unit connected between the rotary motor and the pinion gear.

[0426] In some embodiments of this specification, the variable curvature device further includes a fixed bracket that movably supports one end and the other end of a first arc member and one end and the other end of a second arc member, the fixed bracket being positioned on the first and second rear edges of the display unit, and the groove may include a first groove formed recessed from a back cover overlapping with a support plate and housing the support plate, and a second groove formed recessed from a back cover overlapping with the fixed bracket and housing the fixed bracket.

[0427] In some embodiments of this specification, the display device may further include a vibrator positioned in the display unit and causing the display panel to vibrate so that sound is output by vibration of the display panel.

[0428] In some embodiments of this specification, the vibrator includes a bobbin and a coil wound on the bobbin, the bobbin may be connected to the back of the display panel by passing through a back cover.

[0429] In some embodiments of this specification, the vibrator includes a pair of sound generators coupled to the back cover of the display panel, the back cover may include a slit positioned between the pair of sound generators.

[0430] In some embodiments of this specification, the vibration device may be positioned between the display panel and the back cover.

[0431] In some embodiments of this specification, the vibration device may include a piezoelectric vibrator having piezoelectric properties, a first electrode portion disposed on a first surface of the piezoelectric vibrator, and a second electrode portion disposed on a second surface opposite to the first surface of the piezoelectric vibrator.

[0432] In some embodiments of this specification, the vibrating device may include a piezoelectric vibrating section having a plurality of inorganic material parts having piezoelectric properties and an organic material part between the plurality of inorganic material parts, a first electrode section disposed on the first surface of the piezoelectric vibrating section, and a second electrode section disposed on the second surface opposite to the first surface of the piezoelectric vibrating section.

[0433] In some embodiments of this specification, the display panel includes a first vibration region and a second vibration region, and the vibration device may include a first vibration generator positioned in the first vibration region of the display panel having a piezoelectric vibration component, and a second vibration generator positioned in the second vibration region of the display panel having a piezoelectric vibration component.

[0434] In some embodiments of this specification, the piezoelectric vibration section of the first vibration generator and the second vibration generator each includes a plurality of vibration generating sections, each of which may be spaced apart from one another on the same plane, with a certain distance between them along a first direction and a second direction.

[0435] In some embodiments of this specification, each of the multiple vibration generating units may include a plurality of inorganic material parts having piezoelectric properties, an organic material part connected between the plurality of inorganic material parts, a first electrode part disposed on the first surface of each of the plurality of inorganic material parts and the organic material part, and a second electrode part disposed on the second surface opposite to the first surface of each of the plurality of inorganic material parts and the organic material part.

[0436] In some embodiments of this specification, the display device further includes a vibrator positioned in a display unit and vibrating the display panel such that sound is output by vibration of the display panel, the display panel includes a first vibration region and a second vibration region separated by a groove and an intermediate member, and the vibrator may include a first vibrator coupled to a back cover and vibrating the first vibration region of the display panel, and a second vibrator coupled to the back cover and vibrating the second vibration region of the display panel.

[0437] In some embodiments of this specification, the display device may further include a rear curtain device positioned behind the display device so as to cover the variable curvature device, and a stand that supports the variable curvature device, passing through the rear curtain device.

[0438] In some embodiments of this specification, the stand may include at least one of a speaker device, a display unit, a power supply board that supplies power to each of the variable curvature devices, and a system board that controls each of the display unit and the variable curvature device.

[0439] This specification, as described above, is not limited to the embodiments and accompanying figures, and it will be apparent to those ordinary skill in the art to which this specification belongs that multiple substitutions, modifications, and alterations are possible without departing from the technical matters of this specification. Accordingly, the scope of this specification is indicated by the claims set forth below, and all modified or altered forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of this specification. [Explanation of symbols]

[0440] 100: Display unit 110: Display panel 120: Back cover 200: Variable curvature device 210: Arc member 220, 270: Drive unit 230: Guide 240: Fixing bracket 300: Stand 400: Rear curtain device 500: Vibration device 510: 1st vibration device 511: First sound generating device 513: Second sound generating device 530:Second vibration device 550: First vibration generator 557: Second vibration generator 600: Cushioning material 700: Position adjustment device 720: Display Lifting Device 730: Display tilt device

Claims

1. A display unit including a display panel, A variable curvature device having a plurality of fixed brackets that movably support an arc member arranged in the rear region of the display device, A sound generating device is arranged on the display panel and positioned between the plurality of fixing brackets, A back cover is positioned between the display panel and the variable curvature device, covering the back of the display panel and supporting the variable curvature device. A display device including a rear cover device positioned on the back of the display unit and covering the variable curvature device.

2. The display device according to claim 1, wherein the rear cover device deforms in response to the change in curvature of the display device based on the drive of the variable curvature device.

3. The rear cover device further includes a cover edge frame and a cover rear frame, The cover edge frame is coupled to the rear edge portion of the display unit and includes a first opening. The display device according to claim 1, wherein the cover rear frame is coupled to the cover edge frame and includes a second opening that overlaps with the first opening.

4. The display device according to claim 3, wherein the cover edge frame is fixed to the rear edge portion of the back cover by a connecting member.

5. The display device according to claim 3, wherein the rear cover device further includes a plurality of cover members fixed to the cover rear frame and positioned in the second opening of the cover rear frame so as to have a certain tension.

6. The plurality of cover members are spaced apart from each other in the first direction and parallel in the second direction. The display device according to claim 5, wherein the first direction and the second direction intersect each other on the main surface of the display panel.

7. The display device according to claim 5, wherein each of the plurality of cover members is tilted to have a certain angle in response to a change in the curvature of the display device.

8. The display device according to claim 5, wherein the plurality of cover members include fiber material, fabric material, metal material, or metal alloy material.

9. The display device according to claim 1, further comprising a stand that supports the variable curvature device via the rear cover device.

10. The display device according to claim 9, wherein the stand includes at least one of the following: a speaker device, a power supply board that supplies power to each of the display device and the variable curvature device, and a system board that controls each of the display device and the variable curvature device.

11. Further including a position adjustment device, The display device according to claim 9, wherein the position adjustment device includes a display lifting device that raises or lowers the height of the display unit mounted on the stand based on the user's operation.

12. The display device according to claim 11, further comprising a display tilt device that tilts the display unit mounted on the stand based on user operation.

13. The display device according to claim 1, further comprising a groove formed in a recess from the back cover superimposed on the variable curvature device, for housing the variable curvature device.

14. The display device according to claim 1, wherein the sound generating device is disposed between the display panel and the back cover.

15. The aforementioned sound generating device is A piezoelectric vibrator having piezoelectric properties, A first electrode portion is arranged on the first surface of the piezoelectric vibrator, A second electrode portion is arranged on the second surface opposite to the first surface of the piezoelectric vibrating portion. The display device according to claim 1, including the following:

16. The aforementioned sound generating device is A piezoelectric vibrating section having a plurality of inorganic material parts having piezoelectric properties and an organic material part located between the plurality of inorganic material parts, A first electrode portion is arranged on the first surface of the piezoelectric vibrator, A second electrode portion is arranged on the second surface opposite to the first surface of the piezoelectric vibrating portion. The display device according to claim 1, including the following:

17. The display device according to claim 1, wherein the display panel includes a first vibration region and a second vibration region separated by an intermediate member.

18. The aforementioned sound generating device is A first sound generating device that vibrates the first vibration region of the display panel, A second sound generating device that vibrates the second vibration region of the display panel, The display device according to claim 17, including the following:

19. The display device according to claim 18, wherein the sound generating device is recessed from the back cover superimposed on the variable curvature device and further includes a groove for housing the variable curvature device.

20. The display device according to claim 19, wherein the intermediate member is disposed between the groove and the display panel.

Images