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]

[0001] The present specification relates to a display device, and more particularly to a curved display device. [Background technology]

[0002] As the information society develops, the demands for display devices for displaying images are increasing in various ways. Recently, the display screen of a display device has a flat shape and is enlarged, which causes a problem that the deviation between the viewing distance for the central area of ​​the screen and the viewing distance for the areas on both sides of the screen becomes large.

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

[0004] In addition, in conventional curved display devices, sound output from an audio device for outputting sound related to images travels behind or below the display panel, so sound quality is degraded due to interference between sounds reflected from walls and floors, which makes it difficult to transmit sound accurately and can reduce the viewer's sense of immersion.

[0005] Therefore, although a conventional curved display device can maximize a user's sense of viewing immersion through a screen curved with a certain curvature, the user's sense of auditory immersion may be reduced due to the difficulty in transmitting sound accurately. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-076838 Summary of the Invention [Problem to be solved by the invention]

[0007] The inventors of the present application recognized the problems of conventional curved display devices and conducted multiple experiments on a display device capable of changing the curvature of a display panel (or unit) and a display device capable of maximizing the user's (or viewer's) viewing immersion by outputting sound in front of the display panel by varying the curvature of the display panel. Through multiple experiments, the inventors invented a display device having a new structure capable of changing the curvature of the display panel and a display device having a new structure capable of maximizing the user's viewing immersion.

[0008] The problem to be solved by the present specification is to provide a display device in which the display panel can be maintained in a planar form or can be varied to have various curvatures.

[0009] Another object of the present invention is to provide a display device capable of maximizing a user's (or viewer's) immersive viewing experience.

[0010] The problems to be solved by the examples of this specification are not limited to those mentioned above, and other problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the technical ideas of this specification belong from the following description. [Means for solving the problem]

[0011] A display device according to some examples of the present specification includes a display unit including a display panel for displaying images and a back cover arranged on the rear of the display panel, and a curvature varying device arranged on the back cover for changing the curvature of the display unit, the curvature varying device including an arc member arranged on a rear region of the display unit parallel to a first direction, a support plate arranged on the rear region of the display unit, a rotary drive unit arranged on the support plate, a linear drive unit arranged on the support plate and moving linearly along a second direction intersecting the first direction by rotation of the rotary drive unit, a rotary link unit connected to a central portion of the arc member on the support plate and rotatingly moving by the linear movement of the linear drive unit to rotate the central portion of the arc member, and a holder unit rotatably supporting the central portion of the arc member on the support plate.

[0012] A display device according to some examples of the present specification includes a display unit and a curvature-variable device arranged on the rear side of the display unit to change the curvature of the display unit, and the display unit may include a display panel that displays an image, a back cover that is arranged on the rear side of the display panel and supports the curvature-variable device, and a groove portion that is concavely formed from the back cover and overlaps the curvature-variable device to accommodate the curvature-variable device.

[0013] Specific matters relating to the various examples of this specification other than the means for solving the problems mentioned above are included in the following description and drawings. Effect of the Invention

[0014] Display devices according to some examples herein can allow the display panel to remain in a planar configuration or to deform the display panel with various curvatures.

[0015] A display device according to some examples of the present specification can vary the curvature of the display panel and output sound in front of the display panel, thereby maximizing the user's (or viewer's) sense of immersion in viewing.

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

[0017] [Figure 1] 1 is a front perspective view of a display device according to an embodiment of the present disclosure; [Diagram 2] 1 is a plan view showing a display device according to an embodiment of the present specification; [Diagram 3] 1A and 1B are side views illustrating a planar form and a curved form of a display device according to an embodiment of the present disclosure; [Figure 4] FIG. 2 is a rear view of a display device according to an embodiment of the present disclosure. [Diagram 5] 1 is an exploded perspective view of a display device according to an embodiment of the present disclosure; [Figure 6] 6 is a diagram showing a curvature variable device and a vibration device disposed on the rear surface of the display device shown in FIG. 5. [Figure 7] 6 is a cross-sectional view taken along line II' shown in FIG. 5. [Figure 8] 7 is a cross-sectional view taken along line II-II' shown in FIG. 6. [Figure 9] FIG. 7 is an enlarged view of the “B1” portion shown in FIG. [Figure 10] FIG. 7 is an enlarged view of the portion “B2” shown in FIG. [Figure 11] FIG. 7 is an enlarged view of the “B3” portion shown in FIG. [Figure 12A] 1 is a cross-sectional view showing a planar form of a display device according to the present specification; [Figure 12B] 1 is a cross-sectional view showing a curvature variable state of a display device according to the present specification; [Figure 13] 1 is a diagram illustrating a position adjustment device in a display device according to an embodiment of the present specification; [Figure 14] FIG. 11 is an exploded perspective view showing a display device according to another example of the present specification. [Figure 15] 15 is a diagram showing a curvature variable device and a vibration device disposed on the rear surface of the display device shown in FIG. 14. [Figure 16] 15 is a cross-sectional view taken along line III-III' shown in FIG. 14. [Figure 17] FIG. 11 is an exploded perspective view showing a display device according to still another example of the present specification. [Figure 18] 18 is a cross-sectional view taken along line IV-IV' shown in FIG. 17. [Figure 19] FIG. 11 is an exploded perspective view showing a display device according to still another example of the present specification. [Figure 20] 20 is a cross-sectional view taken along line VV' shown in FIG. 19. [Figure 21] FIG. 1 illustrates a vibration generator according to an embodiment of the present specification. [Figure 22] FIG. 13 illustrates a vibration generator according to another example of the present specification. [Figure 23] FIG. 13 is a diagram showing a vibration generator according to still another example of the present specification. [Figure 24] FIG. 13 is a diagram showing a vibration generator according to still another example of the present specification. [Diagram 25] 13 is a diagram showing a vibration generating unit according to still another example of the present specification. FIG. [Figure 26] 26 is a cross-sectional view taken along line VI-VI' shown in FIG. 25. [Figure 27] 13A and 13B are diagrams illustrating modified examples of a curvature varying device in the display device according to the present specification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The advantages and features of the present specification, and the methods for achieving them, will become clear with reference to the following examples described in detail with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, and may be realized in various different forms. The embodiments are provided merely to complete the disclosure of the present specification and to fully inform those skilled in the art of the invention to which the present specification pertains, and the present specification is defined only by the scope of the claims.

[0019] The shapes, sizes, ratios, angles, numbers, etc. shown in the drawings for describing an example of the present specification are merely illustrative, and the present specification is not limited to the matters shown in the drawings. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present specification, if a detailed description of related known technology is determined to unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

[0020] When the terms "including," "having," "consisting of," and the like are used as mentioned in this specification, other parts can be added unless "only consisting of" is used. When an element is expressed in the singular, it includes the plural unless otherwise expressly stated.

[0021] When interpreting elements, they are to be interpreted as including a range of error even if there is no separate explicit description.

[0022] When describing a positional relationship, for example when the positional relationship of two parts is described using "above", "upper than", "below", "beside", etc., one or more other parts may be located between the two parts, unless "immediately" or "directly" is used.

[0023] When describing a temporal relationship, for example when the temporal sequence is described using "after", "following", "next to", "before", etc., it can also include cases where the sequence is not consecutive, since "immediately" or "directly" is not used.

[0024] Although the terms "first", "second" and the like are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, the first component referred to below may be the second component within the technical concept of the present invention.

[0025] The term "at least one" should be understood to include all combinations that can be present from one or more of the associated items. For example, the meaning of "at least one of the first item, the second item, and the third item" can include all combinations of items that can be present from among the first item, the second item, and the third item, not just the first item, the second item, or the third item individually.

[0026] The technical features of each of the examples in this specification may be partially or fully combined or combined with each other, and various technical interlocking and driving are possible, and each example may be implemented independently of each other, or may be implemented together in a related relationship.

[0027] Hereinafter, examples of display devices according to embodiments of the present specification will be described in detail with reference to the accompanying drawings. In assigning reference numerals to components in each drawing, the same components may have the same reference numerals as much as possible even if they are shown in different drawings. In addition, the scales of the components shown in the accompanying drawings may be different from the actual scales for convenience of explanation, and therefore are not limited to the scales shown in the drawings.

[0028] FIG. 1 is a front perspective view showing a display device according to an embodiment of the present specification, FIG. 2 is a plan view showing a display device according to an embodiment of the present specification, and FIG. 3 is a side view showing a planar form and a curved form of a display device according to an embodiment of the present specification.

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

[0030] The display device 100 can be mounted in an upright position on a stand 300 or a wall-mount bracket. For example, the stand 300 or the wall-mount bracket can be connected (or coupled) to the rear or curvature-variable device of the display device 100. Additionally, the display device 100 can be tilted forward and backward (or forward and backward) or moved up and down while mounted on the stand 300 or the wall-mount bracket.

[0031] The display device 100 according to an embodiment of the present specification may be transformed into a flat or curved shape by driving a curvature variable device based on a user's operation on a curvature variable button unit (CVB) disposed on the stand 300. For example, when the display device 100 is in a flat shape having a curvature (R0) (or a first curvature) of 0 (zero), the curvature variable device may transform the display device 100 into a curved shape having a curvature (R1) (or a second curvature) greater than 0 (zero) in response to a user's operation on a first button switch (BS1) of the curvature variable button unit (CVB). Here, the curvature variable device may gradually change the curvature of the display device 100 depending on the operation time (or pressing duration) of the first button switch (BS1), or may bend (or change) the display device 100 to a preset curvature (R1) from among various curvatures by a single operation (or pressing) of the first button switch (BS1). Conversely, when the display unit 100 is in a curved form having a curvature (R1) greater than 0 (zero), the curvature variable device can transform or restore the display unit 100 to a flat form having a curvature (R0) of 0 (zero) in response to a user's operation of the second button switch (BS2) of the curvature variable button unit (CVB).

[0032] The display device 100 according to another embodiment of the present specification may be transformed into a flat or curved shape by driving a curvature variable device based on a user's operation of a remote controller (RC) supporting a short-range wireless interface. For example, when the display device 100 is in a flat shape having a curvature (R0) of 0 (zero), the curvature variable device may gradually change the curvature of the display device 100 according to the operation time (or pressing duration) of the first button (BS1) of the remote controller (RC), or may bend (or transform) the display device 100 to a preset curvature (R1) by a single operation (or single press) of the first button (BS1). Conversely, when the display device 100 is in a curved shape having a curvature (R1) greater than 0 (zero), the curvature variable device may transform or return the display device 100 to a flat shape having a curvature (R0) of 0 (zero) in response to a user's operation of the second button (BS2) of the remote controller (RC).

[0033] In the display device according to an embodiment of the present specification, the display unit 100 may function as a diaphragm that displays an image and outputs sound (PVS) to the front (FD) when not displaying an image. Therefore, the display device according to an embodiment of the present specification may further include a vibration device 500 disposed on the rear surface of the display unit 100.

[0034] The vibration device (or vibration device) 500 may be implemented to use the display unit 100 as a diaphragm and output a sound (PVS) generated by the vibration of the display unit 100 to the front (FD) of the display unit. For example, the vibration device 500 may vibrate the display panel 110 of the display unit 100 in response to an audio signal (or voice signal), thereby generating a sound (PVS) (or a vibration sound of the panel) by the vibration of the display panel 110 (or the vibration of the panel). For example, the vibration device 500 may directly vibrate the display panel 110.

[0035] The vibration device 500 according to an embodiment of the present specification may be disposed in each of the first and second vibration areas of the display unit 100. The display unit 100 may realize stereo sound by outputting a first sound (or a left sound) and a second sound (or a right sound) generated by vibration of the first and second vibration areas by the vibration device 500 to the forward direction (FD). For example, the vibration device 500 may directly vibrate each of the first and second vibration areas of the display panel 110.

[0036] The display device according to an embodiment of the present disclosure may further include a rear curtain device 400 implemented on the rear side of the display device 100 to cover the variable curvature device.

[0037] The rear curtain device 400 is deformed to correspond to the change in curvature of the display device 100 caused by the driving of the curvature changing device, thereby preventing the mechanism arranged on the rear side of the display device 100 from being exposed to the outside of the side. Such a rear curtain device 400 will be described later.

[0038] The display apparatus according to an embodiment of the present specification may provide a display device 100 (or display screen) that can be transformed into a flat or curved form according to the selection (or preference) of a user (or viewer), and maximize the viewer's immersive viewing experience through the display device 100 (or display screen) that is curved into a curved form. In addition, the display apparatus according to an embodiment of the present specification may provide the viewer with accurate and improved sound quality (PVS) without loss or distortion by outputting sound toward the front (FD) of the display device 100 (viewer's face) through vibration of the display device 100, thereby providing a display apparatus that can enhance the viewer's auditory immersive experience. Furthermore, the display device according to one embodiment of the present specification can prevent or minimize discomfort (or disharmony) caused by the difference in distance between the image and the sound by outputting sound toward the front (FD) of the display device 100 (the viewer's face) through the vibration of the display device 100 (or display screen) curved in a curved shape, and can provide the viewer with accurate and improved sound quality (PVS) without loss or distortion, thereby maximizing the user's (or viewer's) sense of viewing immersion.

[0039] FIG. 4 is a rear view of a display device according to one embodiment of the present specification, FIG. 5 is an exploded oblique view of a display device according to one embodiment of the present specification, FIG. 6 is a view showing a curvature variable device and a vibration device arranged on the rear of the display device shown in FIG. 5, and FIG. 7 is a cross-sectional view of line I-I' shown in FIG. 5.

[0040] 4 to 7, a display device according to an embodiment of the present disclosure may include a display unit 100, a variable curvature device 200, and a stand 300.

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

[0042] A display device 100 according to an embodiment of the present disclosure may include a display panel 110 and a back cover 120, as shown in FIG.

[0043] The display panel 110 may include a bendable or 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 an embodiment of the present disclosure may include a pixel array layer disposed on a base substrate, the pixel array layer having a plurality of pixels, and an encapsulation member covering the pixel array layer.

[0045] Each of the plurality of pixels may include a light emitting element layer. The light emitting element layer may be realized as a top light emitting structure (or a front light emitting structure) that emits light to the outside through an encapsulant, or as a bottom light emitting structure (or a back light emitting structure) that emits light to the outside through a base substrate. In this specification, it is assumed that the light emitting element layer is realized as a top light emitting structure.

[0046] The sealing member may have a function of protecting the light emitting element layer from oxygen and / or moisture by covering the pixel array layer. For example, the sealing member of the upper light emitting structure may be transparent, and the sealing member of the lower light emitting structure may be opaque.

[0047] The display panel 110 according to an embodiment of the present specification may further include a touch sensor layer (or a touch electrode layer) for detecting a touch position of a user. When the light emitting element layer has an upper light emitting structure, the touch sensor layer may be disposed on the encapsulating member. When the light emitting element layer has a lower light emitting structure, the touch sensor layer may be disposed on the base substrate.

[0048] The back cover 120 may realize a rear structure of the display device 100. The back cover 120 may be disposed on the rear surface of the display panel 110 to cover or support the rear surface of the display panel 110.

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

[0050] The back cover 120 according to an embodiment of the present disclosure may be connected (or coupled) to the rear surface 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 rear surface of the display panel 110, thereby providing an air gap (AG) between the back cover 120 and the rear surface of the display panel 110.

[0052] The cover connecting member 130 according to an embodiment of the present disclosure may be an adhesive resin, a double-sided tape, or a double-sided adhesive foam pad, and may have elasticity for shock absorption.

[0053] According to an embodiment of the present disclosure, the cover connecting member 130 may include a magnet, for example, but is not limited to, a rubber magnet.

[0054] According to an embodiment of the present disclosure, the cover connecting member 130 may be disposed along an edge portion of the rear surface of the display panel 110 and an edge portion of the front surface of the back cover 120. For example, an air gap (AG) between the back cover 120 and the rear surface of the display panel 110 may be an area or space surrounded by the cover connecting member 130.

[0055] The display device 100 according to an embodiment of the present disclosure may further include a middle frame 140 .

[0056] The middle frame 140 may be disposed between an edge portion on the rear side of the display panel 110 and an edge portion on the front side of the back cover 120. The middle frame 140 surrounds both the outer surface (or outer wall) of the display panel 110 and the outer surface (or outer wall) of the back cover 120, thereby protecting the outer surfaces of the display panel 110 and the back cover 120 and improving the outer design of the side of the display device. For example, the middle frame 140 may be expressed as a middle cabinet, a middle cover, or a middle chassis, and is not limited to these terms.

[0057] The middle frame 140 according to an embodiment of the present specification may include a support portion that supports edge portions of the display panel 110 and the back cover 120, and a side wall portion that surrounds the sides of the display panel 110 and the back cover 120. For example, the middle frame 140 may have a frame structure having a cross-sectional structure in the shape of a letter "├" or "┤" that forms a single body of the support portion and the side wall portion.

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

[0059] In one embodiment of the middle frame 140 of the present specification, a first surface of the support portion is spaced apart from the rear edge portion of the display panel 110, and a second surface of the support portion can be coupled to the front edge portion of the back cover 120 via an adhesive material.

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

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

[0062] The curvature variable device 200 can move (or advance) both sides of the display device 100 toward the front (FD) of the display device in response to an operation by a user (or viewer), so that both sides of the display device 100 can protrude toward the front (FD) of the display device from the center. As a result, the display device 100 can be transformed into a curved shape having a curvature greater than 0 (zero) as both sides protrude toward the front (FD) of the display device from the center. For example, when a viewer positioned in front of the display device views the display device 100 transformed into a curved shape, the center can have a curved shape with a concave curve from both sides. The display device 100 having such a curved shape can provide a user with an image that has a more three-dimensional effect and a high immersive feeling. For example, the display device 100 having a curved shape can be realized when a single user watches an image instead of a plurality of users, but is not necessarily limited thereto.

[0063] The curvature varying device 200 can move (or move backward) both sides of the display unit 100 protruding toward the front (FD) of the display device toward the rear (RD) of the display device in response to a user's operation, thereby returning both sides of the display unit 100 to the same plane as the center part. As a result, the display unit 100 can be transformed into a planar shape having a curvature of 0 (zero) as both sides and the center part are positioned on the same plane. Such a planar display unit 100 can be realized when multiple users, not just one user, are viewing images, but is not necessarily limited thereto.

[0064] The curvature varying device 200 according to one embodiment of the present disclosure may include an arc member 210 , a driver 220 , and a guide 230 .

[0065] The arc member 210 may be disposed on the rear surface of the display device 100. For example, the arc member 210 may be disposed on the rear surface of the back cover 120.

[0066] The arc member 210 according to an embodiment of the present specification may have a curved shape. For example, the arc member 210 may be expressed as a curvature variation member, a curvature variation rod, a curvature variation bar, or a curvature variation pipe, but is not limited to these terms.

[0067] The arc member 210 can move both sides of the display device 100 toward the front (FD) or rear (RD) of the display device by rotating by the driving unit 220. For example, the arc member 210 can rotate up to 90 degrees in a first rotation direction at that position by the driving unit 220, or rotate up to 90 degrees in a second rotation direction opposite to the first rotation direction. Here, the first rotation direction can be a forward rotation or clockwise rotation, and the second rotation direction can be a reverse rotation or counterclockwise rotation, but is not limited thereto, and can be vice versa. For example, the display device 100 can be transformed into a curved shape having a curvature greater than 0 (zero) by the arc member 210 rotating in the first rotation direction, and can be transformed into or restored to a curved shape having a curvature of 0 (zero) by the arc member 210 rotating in the second rotation direction in a state where the arc member 210 is rotated in the first rotation direction.

[0068] The arc member 210 according to one embodiment of the present disclosure may include a first arc member 211 and a second arc member 213 .

[0069] The first arc member 211 may be disposed in a first rear area (RA1) of the display unit 100 parallel to the first direction (X). For example, the first arc member 211 may be disposed in a first rear area (RA1) of the back cover 120. The first rear area (RA1) may be an upper rear area adjacent to a first long side of the rear of the display unit 100 in an upright state or based on the second direction (Y). For example, the first rear area (RA1) of the back cover 120 may be between a rear middle area 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 toward a first long side of the display unit 100. The center (or center of length) 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 a vertical midline (VCL) of the display unit 100. For example, in a direction of looking at the rear of the display unit 100 having a curvature of 0 (zero) (or in a rear view), one end (or a first end) of the first arc member 211 may be adjacent to the vertical midline (VCL) of a first short side (or an edge portion of the first rear surface) of the display unit 100, and the other end (or a second end) of the first arc member 211 may be adjacent to the vertical midline (VCL) of a second short side (or an edge portion of the second rear surface) of the display unit 100.

[0071] The second arc member 213 may be disposed in a second rear region (RA2) of the display unit 100 parallel to the first direction (X). The second arc member 213 may be disposed in a second rear region (RA2) of the back cover 120. The second rear region (RA2) may be a lower rear region adjacent to a second long side of the rear of the display unit 100 in an upright state or based on the second direction (Y). The second rear region (RA2) of the back cover 120 may be between the second long side of the display unit 100 and a rear middle region.

[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 center of length) 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 direction of looking at the rear of the display unit 100 having a curvature of 0 (zero) (or in a rear view), one end (or a first end) of the second arc member 213 may be adjacent to the vertical midline (VCL) of the first short side (or an edge portion of the first rear surface) of the display unit 100, and the other end (or a second end) of the second arc member 213 may be adjacent to the vertical midline (VCL) of the second short side (or an edge portion of the second rear surface) of the display unit 100.

[0073] The first arc member 211 and the second arc member 213 may be disposed on the rear surface of the display device 100 so as to be symmetrical with respect to each other across a rear mid-region or a vertical mid-line (VCL) of the display device 100. Here, the vertical mid-line (VCL) of the display device 100 may be located on the center of the short side length (or longitudinal length) of the display device 100.

[0074] Each of the first arc member 211 and the second arc member 213 according to an embodiment of the present 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, an arc bar, or an 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 driving the driving unit 220. According to an embodiment of the present specification, the first arc member 211 and the second arc member 213 can be rotated in opposite directions at their positions by driving the driving unit 220. For example, the first arc member 211 can be rotated in a first rotation direction at their positions by driving the driving unit 220, and at the same time, the second arc member 213 can be rotated in a second rotation direction at their positions by driving the driving unit 220. Conversely, the first arc member 211 can be rotated in a second rotation direction at their positions by driving the driving unit 220, and at the same time, the second arc member 213 can be rotated in a first rotation direction at their positions by driving the driving unit 220.

[0076] The central space on the back of the display device 100, which is disposed between the respective centers of the first arc member 211 and the second arc member 213, can be relatively large since the respective centers of the first arc member 211 and the second arc member 213 are disposed adjacent to the long side of the display device 100. This can increase the utilization of the back space of the display device 100 in which mechanical components or circuit components are disposed, and can facilitate the arrangement of the mechanical components or circuit components.

[0077] The actuator 220 may be disposed in a central region of the rear surface of the display device 100. The actuator 220 may be disposed between the first arc member 211 and the second arc member 213.

[0078] The driver 220 can rotate each of the first arc member 211 and the second arc member 213 simultaneously. The driver 220 can rotate each of the first arc member 211 and the second arc member 213 simultaneously in opposite rotational directions at their positions. For example, the driver 220 can rotate the first arc member 211 at its position in a first rotational direction up to 90 degrees and simultaneously rotate the second arc member 213 at its position in a second rotational direction up to 90 degrees. Conversely, the driver 220 can rotate the first arc member 211 at its position in a second rotational direction up to 90 degrees and simultaneously rotate the second arc member 213 at its position in the first rotational direction up to 90 degrees.

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

[0080] The guide 230 may be disposed on the rear surface of the display device 100 parallel to the second direction (Y) and movably support the first and second intermediate portions of the arc member 210. For example, in a direction of viewing the rear surface of the display device 100 having a curvature of 0 (zero), the first intermediate portion of the arc member 210 may be located in the middle (or the middle on the right side) between the center and one end (or the first end), and the second intermediate portion of the arc member 210 may be located in the middle (or the middle on the left side) between the center and the other end (or the second end). The guide 230 prevents the arc member 210 having a curved shape from lifting up from the rear surface of the display device 100 based on the thickness direction (Z) of the display device 100 when the arc member 210 rotates, and thus the pressure of the arc member 210 generated by the rotation of the arc member 210 may be applied to both sides of the display device 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 seat for the rotating arc member 210 .

[0081] A first side (or one side) and a second side (or the other side) of the guide 230 may be fixed to the rear surface of the display unit 100. A first side (or one side) and a second side (or the other side) of the guide 230 may be fixed to the rear surface of the back cover 120. A middle portion between the first side and the second side of the guide 230 may be spaced apart from the rear surface of the display unit 100. As a result, the arc member 210 is movably disposed in the space between the rear surface of the display unit 100 and the middle portion of the guide 230, so that the arc member 210 can be prevented from floating by the guide 230 during rotation, and both sides of the display unit 100 can be protruded toward the front (FD) of the display device using the guide 230 as a support.

[0082] The guide 230 according to one embodiment of the present specification is arranged in each of the third rear area (RA3) and the fourth rear area (RA4) of the display device 100, and can movably support each of the first arc member 211 and the second arc member 213.

[0083] In the display device 100, the third rear area (RA3) may be a right area (or a left area) of the rear surface of the display device 100 based on a horizontal center line (HCL) of the display device 100 parallel to the second direction (Y). The fourth rear area (RA4) may be a left area (or a right area) of the rear surface of the display device 100 based on the horizontal center line (HCL) of the display device 100. Here, the horizontal center line (HCL) of the display device 100 may be located at the center of the length (or width) of the long side of the display device 100. For example, in a direction of viewing the rear surface of the display device 100 having a curvature of 0 (zero), the third rear area (RA3) may be an area between a first short side of the display device 100 and the horizontal center line (HCL), and the fourth rear area (RA4) may be an area between a second short side of the display device 100 and the horizontal center line (HCL).

[0084] The guide 230 according to an embodiment of the present specification may include first to fourth guide members 231 , 232 , 233 , and 234 .

[0085] The first guide member 231 is disposed in the third rear area (RA3) of the display device 100, and can movably support the first middle portion of the first arc member 211.

[0086] Each of the first and second sides of the first guide member 231 may be fixed to the first rear area (RA1) of the display device 100 with the first arc member 211 therebetween. For example, each of the first and second sides of the first guide member 231 may be fixed to the first rear area (RA1) of the back cover 120 by a fastening member such as a screw or a bolt.

[0087] An intermediate portion between the first side and the second side of the first guide member 231 may be disposed in a third rear area (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 spaced apart 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 respective heights of the first side and the second side. Thus, the first intermediate portion of the first arc member 211 may be movable into the 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 disposed in the fourth rear area (RA4) of the display unit 100, and can movably support a second middle portion of the first arc member 211. The second guide member 232 is substantially the same as the first guide member 231, except that it is disposed in the first rear area (RA1) of the fourth rear area (RA4) of the display unit 100, and movably supports the second middle portion of the first arc member 211, so a duplicated description thereof will be omitted.

[0089] The third guide member 233 is disposed in the third rear area (RA3) of the display unit 100, and can movably support a first middle portion of the second arc member 213. The third guide member 233 is substantially the same as the first guide member 231, except that it is disposed in the second rear area (RA2) of the third rear area (RA3) of the display unit 100, and movably supports a first middle portion of the second arc member 213, so a duplicated description thereof will be omitted.

[0090] The fourth guide member 234 is disposed in the fourth rear area (RA4) of the display unit 100, and can movably support a second middle portion of the second arc member 213. The fourth guide member 234 is substantially the same as the first guide member 231, except that it is disposed in the second rear area (RA2) of the fourth rear area (RA4) of the display unit 100, and movably supports a second middle portion of the second arc member 213, so a duplicated description thereof 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 a rear space of the display unit 100 for arranging mechanical components 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 a rear space of the display unit 100 for arranging mechanical components or circuit components of the display device.

[0092] The curvature varying device 200 according to an embodiment of the present disclosure may further include a fixing bracket 240 .

[0093] The fixing bracket 240 is disposed in the third rear area (RA3) and the fourth rear area (RA4) of the display device 100, and can movably support the leading ends of the first arc member 211 and the second arc member 213. The fixing bracket 240 movably supports the leading ends of the first arc member 211 and the second arc member 213, and can guide the movement of the leading ends of the first arc member 211 and the second arc member 213. For this purpose, the fixing bracket 240 can include a side groove (or a side pocket portion) having a certain depth from the inner surface so that the leading ends of the first arc member 211 and the second arc member 213 can be movably inserted. Such a fixing bracket 240 can transmit the pressure applied by the leading ends of the first arc member 211 and the second arc member 213 to the edge portions of the first rear surface and the edge portions of the second rear surface of the display device 100 when the first arc member 211 and the second arc member 213 rotate. In this case, the fixing bracket 240 allows the tips of the first arc member 211 and the second arc member 213 to come into surface contact with the display device 100, thereby also serving to prevent localized damage to the display device 100 due to localized point contact between the tips of the first arc member 211 and the second arc member 213 and the display device 100.

[0094] The fixing bracket 240 according to an embodiment of the present specification may include first to fourth fixing brackets 241 , 242 , 243 , and 244 .

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

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

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

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

[0099] Each of the first to fourth fixing brackets 241, 242, 243, and 244 may be disposed parallel to the second direction (Y) on the rear surface of the display unit 100. For example, when the display unit 100 is in a flat form, the ends of the arc members 211 and 213 may be disposed adjacent to one side of each of the first to fourth fixing brackets 241, 242, 243, and 244 adjacent to the vertical midline (VCL) of the display unit 100. Also, when the display unit 100 is transformed from a flat form to a curved form, the ends of the arc members 211 and 213 may move from one side to the other side of each of the first to fourth fixing brackets 241, 242, 243, and 244 while applying pressure to each of the first to fourth fixing brackets 241, 242, 243, and 244 due to the rotation of the arc members 211 and 213.

[0100] Additionally, each of the first to fourth fixing brackets 241, 242, 243, and 244 of the fixing bracket 240 may be disposed on the rear surface of the display unit 100 inclined at a certain angle with respect to the second direction (Y) rather than parallel to the second direction (Y). According to an embodiment, each of the first to fourth fixing brackets 241, 242, 243, and 244 may be disposed inclined to correspond to a moving trajectory of the tip of the arc members 211 and 213 when the arc members 211 and 213 rotate. 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 disposed closer to the horizontal centerline (HCL) than the other side.

[0101] The stand 300 is disposed on the rear surface of the display device 100 and can support the display device 100 in an upright state. For example, the stand 300 can be supported by the variable curvature device 200.

[0102] A stand 300 according to one embodiment of the present disclosure may include a base 310 and a post 330 .

[0103] The base 310 may be realized to have a certain size. The base 310 may include a curvature variable button unit (CVB) and a curvature variable control circuit that controls the driver 220 of the curvature variable device 200 according to a user's operation of the curvature variable button unit (CVB).

[0104] The post 330 may be disposed perpendicular to the base 310 and coupled to a gear box cover 290 disposed on the variable curvature device 200. In this way, the display device 100 may be supported or attached to the post 330 of the stand 300 in an upright position.

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

[0106] The display device according to an embodiment of the present specification may further include a power supply board 370 built into the stand 300. The power supply board 370 may generate and output driving power for driving each of the display device 100 and the curvature variable device 200 based on an input power source inputted through a power cable. The power supply board 370 according to an embodiment may include a power conversion circuit (or a power conversion module) and a power management circuit (or a power management module).

[0107] The display device according to an embodiment of the present specification may further include a system board 390 built into the stand 300, thereby improving the design freedom of the curvature variable device 200 disposed on the rear side of the display device 100. The system board 390 (or a set main board) may include various electronic components or various circuit modules for controlling each of the display device 100 and the curvature variable device 200, driving the display device, and displaying an image on the display device 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] The display device according to an embodiment of the present disclosure may further include a rear curtain device 400 .

[0109] 3 to 5, the rear curtain device 400 may be implemented on the rear of the display device 100 to cover the curvature variable device 200. The rear curtain device 400 may be implemented as a rear structure of the display device. The rear curtain device 400 may be deformed to correspond to the change in curvature of the display device 100 caused by the driving of the curvature variable device 200.

[0110] The rear curtain device 400 according to one embodiment of the present disclosure may include a curtain edge frame 410 , a curtain rear frame 430 , and a number of curtain members 450 .

[0111] The curtain edge frame 410 may be connected to an edge portion of the rear surface of the display device 100 and may include a first opening. For example, the curtain edge frame 410 may be realized in the form of a picture frame having a first opening overlapping the rear surface of the display device 100 except for the edge portion of the rear surface of the display device 100. The curtain edge frame 410 may be fixed to the edge portion of the rear surface of the back cover 120 by a fastening member such as a screw or a bolt.

[0112] The curtain back frame 430 may be coupled to the curtain edge frame 410 and may include a second opening overlapping the first opening. For example, the curtain back frame 430 may be realized in the form of a picture frame having a second opening overlapping the first opening of the curtain edge frame 410. The curtain back frame 430 may be fixed to the curtain edge frame 410 by a coupling member such as a screw or a bolt.

[0113] The curtain members 450 may 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). The curtain members 450 may be arranged 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 curtain members 450 may be arranged in the second opening of the curtain back frame 430 so as to have a certain tension and may be tilted at a certain angle to accommodate changes in the curvature of the display device 100. Each of the curtain members 450 according to an embodiment of the present specification may include, but is not limited to, a fiber material or a fabric material that is deformable to accommodate changes in the curvature of the display device 100, and may be made of a metal material.

[0114] The rear curtain device 400 according to an embodiment of the present specification may further include a stand connection hole 470. The stand connection hole 470 is realized by removing a middle portion of the plurality of curtain members 450, so that a middle portion of the rear of the display device 100 can be exposed to the rear (RD) of the display device. Thus, the stand 300 can be coupled or connected to the curvature variable device 200 through the stand connection hole 470 of the rear curtain device 400 to support the display device 100.

[0115] The display device according to an embodiment of the present specification may further include a vibration device 500.

[0116] 4 to 6, the vibration device 500 is disposed on the rear surface of the display device 100 and may vibrate the display device 100 to output sound by the vibration of the display device 100. The vibration device 500 may be disposed on the rear surface of the display device 100 and may be realized to vibrate the display panel 110 so that sound is output by the vibration of the display panel 110. For example, the vibration device 500 may vibrate each of the first vibration area (or third rear area (RA3)) and the second vibration area (or fourth rear area (RA4)) of the display device 100, thereby outputting each of the first sound (or left sound) and the second sound (or right sound) generated in each of the first vibration area and the second vibration area of ​​the display device 100 to the front (FD) of the display device 100, thereby realizing stereo sound.

[0117] The vibration device 500 may be supported by the back cover 120 of the display device 100 and may penetrate the back cover 120 to be connected to the rear surface of the display panel 110. To this end, the back cover 120 may include a through hole 121 into which the vibration device 500 may be inserted. For example, the vibration device 500 may be fixed to the back cover 120 of the display device 100 and may directly vibrate the display device 100.

[0118] A vibration device 500 according to one embodiment of the present disclosure may include first and second vibration devices (or vibrators) 510,530.

[0119] The first vibrating device 510 may vibrate the first vibration area (RA3) of the display device 100 to output a first sound (or a left sound) generated in the first vibration area of ​​the display device 100 to the front (FD) of the display device 100. For example, the first vibrating device 510 may be supported by the back cover 120 and connected to the rear surface of the display panel 110 through a through hole 121 disposed in the back cover 120.

[0120] The second vibrating device 530 may vibrate the second vibration area (RA4) of the display device 100 to output a second sound (or a right sound) generated in the second vibration area of ​​the display device 100 to the front (FD) of the display device 100. For example, the second vibrating device 530 may be supported by the back cover 120 and connected to the rear surface of the display panel 110 through a through hole 121 disposed in the back cover 120.

[0121] The first and second vibration devices 510, 530 according to an embodiment of the present specification may be configured in a twin type structure as shown in Figs. 4 to 6. The twin type structure may be realized as a two array structure or a twin type vibration device, and is not limited to the term. Each of the first and second vibration devices 510, 530 according to an embodiment of the present specification is not limited to a twin type structure, and may be realized as a single type structure or configured as a structure of two or more arrays. For example, each of the first and second vibration devices 510, 530 may be configured as a four-array structure or a six-array structure.

[0122] Each of the first vibration device 510 and the second vibration device 530 according to an embodiment of the present specification may include a pair of sound generating devices (or sound generators) 511, 513, or first and second sound generating devices 511, 513, arranged parallel to each other on the display device 100. For example, each of the first and second vibration devices 510, 530 may be realized as a twin type vibration device including the first and second sound generating devices 511, 513.

[0123] The first and second sound generating devices 511, 513 may be supported on the back cover 120 of the display device 100 so as to be parallel to each other, and may be connected to the rear surface of the display panel 110 by passing through the first and second through holes 121a, 121b, respectively, of the through holes 121 arranged on the back cover 120.

[0124] The first sound generating device 511 of the first vibration device 510 passes through a first through hole 121a arranged in the back cover 120 overlapping with the first vibration area (RA3) of the display unit 100, is connected to the first vibration area (RA3) of the display panel 110, and can be coupled to the rear surface of the back cover 120 around the first through hole 121a.

[0125] The second sound generating device 513 of the first vibration device 510 can be connected to the first vibration area (RA3) of the display panel 110 by passing through a second through hole 121b arranged in the back cover 120 overlapping with the first vibration area (RA3) of the display device 100, and can be coupled to the rear 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 passes through a first through hole 121a arranged in the back cover 120 overlapping the second vibration area (RA4) of the display unit 100, is connected to the second vibration area (RA4) of the display panel 110, and can be coupled to the rear surface of the back cover 120 around the first through hole 121a.

[0127] The second sound generating device 513 of the second vibration device 530 can be connected to the second vibration area (RA4) of the display panel 110 by passing through a second through hole 121b arranged in the back cover 120 overlapping with the second vibration area (RA4) of the display device 100, and can be coupled to the rear surface of the back cover 120 around the second through hole 121b.

[0128] Referring to FIG. 7, the display device 100 according to an embodiment of the present disclosure may further include an intermediate member 150.

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

[0130] According to an embodiment, the intermediate member 150 may be disposed between the display panel 110 and the back cover 120 so as to overlap the curvature variable device 200. For example, the intermediate member 150 may be disposed between the display panel 110 and the back cover 120 so as to overlap the horizontal center line (HCL) of the display device 100. As an embodiment, the intermediate member 150 may have a line shape parallel to the second direction (Y). As another embodiment, the intermediate member 150 may have the same shape as the contact surface of the curvature variable device 200 that contacts the rear surface of the back cover 120. The intermediate member 150 is disposed between the first vibration area (or the third rear area (RA3)) and the second vibration area (or the fourth rear area (RA4)) of the display device 100, thereby spatially separating the first vibration area and the second vibration area, thereby preventing mutual interference between the first vibration area and the second vibration area.

[0131] The intermediate member 150 according to an embodiment may be realized with the same or different material as the cover connecting member 130. For example, the intermediate member 150 may be an adhesive resin, a double-sided tape, or a double-sided adhesive foam pad, and may have elasticity for shock absorption. The intermediate member 150 may be expressed as a buffer member, a reinforcing member, an area separating member, a partition member, or the like, but is not limited to these terms.

[0132] FIG. 8 is a cross-sectional view taken along line II-II' in FIG. 6, which is a cross-sectional view showing the first vibrating device shown in FIGS.

[0133] Referring to Figures 4 to 6 and 8, each of the first vibration device 510 and the second vibration device 530 according to one embodiment of the present specification includes first and second sound generating devices 511 and 513, and each of the first and second sound generating devices 511 and 513 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 may be realized by a fixed part that is fixed to the back cover 120. The magnet 502, the bobbin 503, the coil 504, the center pole 505, and the damper 506 may be expressed as a vibration part for vibrating the display panel 110, but is not necessarily limited thereto.

[0135] The base frame 501 according to an embodiment of the present disclosure may include a frame body 501a, an upper plate 501b, and a protruding bracket 501c.

[0136] The frame body 501a may be fixed to the back cover 120. The frame body 501a may serve as a lower plate that supports the magnet 502.

[0137] The upper plate 501b may be disposed on the edge of the front surface of the frame body 501a so as to have a cylindrical shape having a hollow portion. The frame body 501a and the upper plate 501b may be formed into one body having a "U" shape. For example, the frame body 501a and the upper plate 501b may be expressed by other terms such as a yoke, without being limited to the term.

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

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

[0140] When the curvature of the display panel 110 changes, the buffer member 600 tilts the base frame 501 according to the curvature of the display panel 110, thereby maintaining contact between the sound generating devices 511, 513 and the display panel 110. For example, the buffer member 600 may be, but is not limited to, an elastic spring or an elastic pad.

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

[0142] The magnetic circuit unit according to an embodiment of the present specification may have an external magnetic type or dynamic type structure including a magnet 502 disposed outside a coil 504, or an internal magnetic type or micro type structure including a magnet 502 disposed inside a coil 504. Sound generating devices 511, 513 including a magnetic circuit unit having an internal magnetic type structure have the advantage of having small leakage magnetic flux and an overall small size. The sound generating devices 511, 513 according to the present specification may have an external magnetic type or internal magnetic type structure, and the following description will be given assuming that they have an internal magnetic type structure.

[0143] The magnet 502 may be disposed 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 a bobbin 503.

[0144] The bobbin 503 may be disposed on the base frame 501 so as to surround the magnet 502, and may be coupled to the rear surface of the display panel 110. The bobbin 503 may have a circular or elliptical shape, but is not limited thereto. The oval shape may 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, the elliptical bobbin 503 may have a ratio of the major diameter to the minor diameter of 1.3:1 to 2:1. The elliptical bobbin 503 may improve the acoustics of the high frequency range more than the circular shape, and may have excellent heat dissipation characteristics since less heat may be generated due to vibration.

[0145] The coil 504 is wound around the outer periphery of the bobbin 503, and is supplied with a current (or voice current) of a driving signal from the outside. The coil 504 can be raised and lowered together with the bobbin 503. The coil 504 can be expressed as a voice coil, but is not limited to this term. When a 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, and sound (or panel vibration sound) is generated by the vibration of the display panel 110 due to the up and down movement (or vibration) of the bobbin 503, and this sound can be output toward the front (FD) of the display device 100.

[0146] The center pole 505 may be disposed on the magnet 502 to guide the vibration of the bobbin 503. For example, the center pole 505 may be inserted or housed in a hollow portion of the bobbin 503, and may be surrounded by the bobbin 503. For example, the center pole 505 may be expressed as a lift guide or pole pieces, but is not limited thereto.

[0147] The damper 506 may be disposed between the base frame 501 and the bobbin 503. The damper 506 according to an embodiment may be disposed between a protruding frame protruding 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 may have a bellows structure between one end and the other end, and may contract and relax due to the vibration of the bobbin 503. Such a damper 506 may 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 a certain distance or below a certain distance, the bobbin 503 may return to its original position due to the restoring force of the damper 506. For example, the damper 506 may be expressed by other terms such as a spider, a suspension, or an edge, but is not limited thereto.

[0148] Each of the first and second sound generating devices 511 and 513 according to an embodiment of the present specification may further include a bobbin protection member 507 disposed on the upper part of the bobbin 503. For example, the bobbin protection member 507 may be expressed as a bobbin ring or a bobbin cap, but is not limited thereto.

[0149] The bobbin protection member 507 is disposed on the front surface (or tip portion) of the bobbin 503 and transmits the elevation (or vibration) of the bobbin 503 to the rear surface of the display panel 110. The bobbin protection member 507 according to an embodiment may have a ring shape disposed on the front surface of the bobbin 503, a disk shape covering the entire front surface of the bobbin 503, or a cap shape enveloping the front surface and the upper outer surface of the bobbin 503, and is not limited to a particular shape.

[0150] The bobbin protection member 507 may be disposed (or coupled) to the rear surface of the display panel 110 via a first adhesive member. The first adhesive member may be interposed between the rear surface of the display panel 110 and the bobbin protection member 507. The first adhesive member according to an embodiment may include, but is not limited to, an adhesive or a double-sided tape.

[0151] The bobbin protection member 507 according to an embodiment of the present specification may be configured in the form of an injection molded product or a metal molded product. For example, the bobbin protection member 507 may be configured of a fiber reinforced material, a composite resin containing a fiber reinforced material, or a metal. In this case, the bobbin protection member 507 may also have a heat dissipation function for dissipating heat generated when the sound generating devices 511 and 513 are driven.

[0152] 4 to 8, the display device according to an embodiment of the present disclosure may further include a slit 125. In the embodiment of the display device shown in FIG.

[0153] The slits 125 may be provided to reduce stress applied to the vibration device 500 when the curvature of the display device 100 changes. In addition, the slits 125 may be provided to minimize deterioration of sound quality due to changes (or deviations) in the air gap (AG) at different positions between the display panel 110 and the back cover 120 according to the curvature of the display device 100.

[0154] The slit 125 may be disposed in the back cover 120 overlapping with the vibration device 500. The slit 125 according to an embodiment may be realized to penetrate the back cover 120 overlapping 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 lengths of the sound generating devices 511 and 513. One end of the slit 125 may be disposed between the pair of sound generating devices 511 and 513.

[0156] The slits 125 are formed to penetrate the back cover 120 vertically along the thickness direction (Z) of the display device 100, thereby allowing the air gap (AG) (or internal air gap) between the display panel 110 and the back cover 120 to communicate with the outside (or external air gap) of the rear surface of the back cover 120. The slits 125 allow the air gap (AG) between the display panel 110 and the back cover 120 to communicate with the external air gap, thereby facilitating the flow of air 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 stably vibrate, thereby increasing the frequency characteristics and sound pressure characteristics of the bass band due to the vibration of the display panel 110. For example, the frequency of the bass band may be 800 Hz or less, but is not limited thereto.

[0157] FIG. 9 is an enlarged view of the "B1" portion shown in FIG. 6, FIG. 10 is an enlarged view of the "B2" portion shown in FIG. 6, and FIG. 11 is an enlarged view of the "B3" portion shown in FIG. 6, which are diagrams for explaining the driving part of the curvature varying device.

[0158] 9 to 11 in combination with FIG. 6, the drive unit 220 of the curvature varying device 200 according to one embodiment of the present specification may include a support plate 221, a rotation drive unit 222, a linear drive unit 223, a rotation link unit 224, and a holder unit 225.

[0159] The support plate 221 may be disposed so as to overlap with the center of the rear surface of the display device 100. For example, the support plate 221 may be realized to have a certain width parallel to the first direction (X) and a certain length parallel to the second direction (Y), and may be disposed (or coupled) on the rear surface of the back cover 120 so as to overlap with the center (or center of length) of each of the first arc member 211 and the second arc member 213. Such a support plate 221 may support each of the rotation drive unit 222, the linear drive unit 223, the rotation link unit 224, and the holder unit 225.

[0160] The support plate 221 according to an embodiment may be disposed (or coupled) to the rear 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 embodiment, the plate fixing member may be an elastic adhesive resin, double-sided tape, or a double-sided adhesive foam pad for shock absorption. When the plate fixing member has elasticity, vibrations generated by driving the curvature varying device 200 may be prevented or minimized from being transmitted to the back cover 120.

[0161] The rotary drive unit 222 is disposed in a rear region of the display device 100, and can cause the linear drive unit 223 to move linearly through rotary motion. For example, the rotary drive unit 222 can be disposed in the center of the rear surface of the support plate 221.

[0162] According to an embodiment, the rotation driver 222 may include at least one rotation motor 222a, 222b, a rotation transmission part (RTP), and a pinion gear (PG).

[0163] At least one rotation motor 222a, 222b may be disposed in a rear middle region of the display device 100 and supported by the support plate 221. The at least one rotation motor 222a, 222b may provide a rotational force to a rotation transmission part (RTP) in response to a user's operation for changing the curvature of the display device 100.

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

[0165] The first and second rotary motors 222a, 222b may be arranged side by side between the rotary transmission parts (RTP). 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 arranged adjacent to the first arc member 211 or facing the first arc member 211. In this case, the first and second rotary motors 222a, 222b may rotate in the same direction as each other.

[0166] According to one embodiment, each of the first and second rotary motors 222a, 222b may be arranged in a rotated state at a certain angle so that the drive shaft (or rotary shaft) faces the short side of the display unit 100 on the rear surface of the display unit 100.

[0167] The rotation transmission part (RTP) may be disposed on the support plate 221 and rotatably connected to at least one of the rotation motors 222a, 222b. For example, the rotation transmission part (RTP) may be connected between the first rotation motor 222a and the second rotation motor 222b. The rotation transmission part (RTP) may rotate in conjunction with the rotation of the at least one of the rotation motors 222a, 222b or the first and second rotation motors 222a, 222b, thereby causing the pinion gear (PG) to rotate. For example, the rotation transmission part (RTP) may be expressed as a gear assembly, a gear assembly, or a reduction gear part, but is not necessarily limited thereto.

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

[0169] The rotation transmission part (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 the first rotary motor 222a to the pinion gear (PG).

[0170] The first worm (W1) may be connected to a drive shaft of the first rotation motor 222a. The first worm (W1) may rotate in a first rotation direction by the rotation of the first rotation motor 222a in a first rotation direction, or may rotate in a second rotation direction by the rotation of the first rotation motor 222a in a second rotation direction.

[0171] The first worm gear (WG1) is connected (or meshed) with the first worm (W1) and can rotate by the rotational motion of the first worm (W1). For example, the first worm gear (WG1) can rotate one gear when the first worm (W1) rotates once. Based on the thickness direction (Z) of the first worm gear (WG1), the rotation axis direction of the first worm gear (WG1) can be perpendicular to the rotation axis direction of the first worm (W1). For example, the rotation axis direction of the first worm (W1) can 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) can be parallel to the thickness direction (Z) of the back cover 120.

[0172] According to one embodiment, the first worm gear (WG1) may include a dual gear structure including 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 the first worm gear (WG1) having the dual gear structure, the lower worm gear may be coupled (or meshed) with the first worm (W1), and the upper worm gear may be coupled (or meshed) with the first spur gear (SG1).

[0173] The first spur gear (SG1) can be connected (or meshed) with the first worm gear (WG1) to rotate in a direction opposite to the direction of rotation of the first worm gear (WG1). For example, the first spur gear (SG1) can be connected (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 connected (or meshed) with the first spur gear (SG1) and connected (or meshed) with the pinion gear (PG). The second spur gear (SG2) can rotate the pinion gear (PG) by rotating in a direction opposite to the direction of rotation of the first spur gear (SG1).

[0175] In one embodiment, the second spur gear (SG2) may include a dual gear structure including 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 the second spur gear (SG2) having a dual gear structure, the lower spur gear may be coupled (or meshed) with the pinion gear (PG) and the upper spur gear may be coupled (or meshed) with the first spur gear (SG1).

[0176] The rotation transmission part (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 the pinion gear (PG).

[0177] The second worm (W2) may be coupled to a drive shaft of the second rotation motor 222b. The second worm (W2) may rotate in a first rotation direction by the rotation of the second rotation motor 222b in the first rotation direction, or may rotate in a second rotation direction by the rotation of the second rotation motor 222b in the second rotation direction.

[0178] The second worm gear (WG2) is connected (or meshed) with the second worm (W2) and can rotate by the rotational motion of the second worm (W2). For example, the second worm gear (WG2) can rotate only one gear when the second worm (W2) rotates once. Based on 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] According to an embodiment, the second worm gear (WG2) may include a dual gear structure including 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 the second worm gear (WG2) having the dual gear structure, the lower worm gear may be coupled (or meshed) with the second worm (W2), and the upper worm gear may be coupled (or meshed) with the third spur gear (SG3).

[0180] The third spur gear (SG3) can be connected (or meshed) with the second worm gear (WG2) to rotate in a direction opposite to the direction of rotation of the second worm gear (WG2). For example, the third spur gear (SG3) can be connected (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 connected (or meshed) with the third spur gear (SG3) and connected (or meshed) with the pinion gear (PG). The fourth spur gear (SG4) can rotate the pinion gear (PG) by rotating in a direction opposite to the direction of rotation of the third spur gear (SG3).

[0182] According to one embodiment, the fourth spur gear (SG4) may include a dual gear structure including 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 the fourth spur gear (SG4) having a dual gear structure, the lower spur gear may be coupled (or meshed) with the pinion gear (PG) and the upper spur gear may be coupled (or meshed) with the third spur gear (SG3).

[0183] The pinion gear (PG) is rotated by the rotational motion transmitted by the rotation transmission part (RTP), and thereby can cause the linear drive part 223 to move linearly.

[0184] The pinion gear (PG) according to one embodiment may include a dual gear structure including 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 (or meshed) with the linear driving unit 223. The first pinion gear (PG1) can cause the linear driving unit 223 to move linearly by rotating due to the rotational motion transmitted by the rotation transmission unit (RTP).

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

[0187] The linear drive unit 223 is moved linearly by the rotational movement of the rotation drive unit 222 , thereby allowing the rotation link unit 224 to rotate.

[0188] According to an embodiment, the linear driver 223 may include a first rack gear portion 223a and a second rack gear portion 223b.

[0189] The first rack gear unit 223a may move linearly along the second direction (Y) in the first rear area (RA1) of the display device 100 by the rotational motion of the pinion gear (PG) provided in the rotation driver 222 to rotate the rotation link unit 224, thereby rotating the first arc member 211. For example, the first rack gear unit 223a may move linearly in a first linear direction (Y+) in the second direction (Y) by the rotational motion of the pinion gear (PG) in the first rotational direction. Conversely, the first rack gear unit 223a may move linearly in a second linear direction (Y-) opposite to the first linear direction (Y+) in the second direction (Y) by the rotational motion of the pinion gear (PG) in the second rotational direction.

[0190] The first rack gear unit 223a according to an embodiment may include a first rack gear bar RGB1, a 1-1th rack gear RG11, and a 1-2nd rack gear RG12.

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

[0192] The 1-1 rack gear (RG11) may protrude (or extend) from one side (or lower side) of the first rack gear bar (RGB1) and may be connected (or meshed) with the pinion gear (PG). For example, the 1-1 rack gear (RG11) may protrude (or extend) from one side (or lower side) of the first rack gear bar (RGB1) along the second direction (Y) to overlap with the second pinion gear (PG2) of the pinion gear (PG), and may be connected (or meshed) with the first pinion gear (PG1) of the pinion gear (PG).

[0193] In one embodiment, the 1-1 rack gear (RG11) is formed on the inner surface of a first protrusion protruding (or extending) 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-second rack gear (RG12) may be formed on the other (or upper) end of the first rack gear bar (RGB1) and connected (or meshed) with the rotating link unit 224. For example, the first-second rack gear (RG12) may be formed on the other (or upper) end of the first rack gear bar (RGB1) along the second direction (Y) to have a preset pitch and connected (or meshed) with the rotating link unit 224. The first-second rack gear (RG12) may cause the rotating link unit 224 to rotate by the linear motion of the first rack gear bar (RGB1).

[0195] The second rack gear portion 223b moves linearly in the opposite direction to the first rack gear portion 223a along the second direction (Y) in the second rear area (RA2) of the display device 100 due to the rotational movement of the pinion gear (PG) provided in the rotation drive portion 222, thereby rotating the rotation link portion 224, thereby rotating the second arc member 213.

[0196] The second rack gear portion 223b may be disposed parallel to the first rack gear portion 223a with the pinion gear (PG) therebetween. The second rack gear portion 223b may move linearly in the opposite direction to the first rack gear portion 223a due to the rotational motion of the pinion gear (PG). For example, the second rack gear portion 223b may move linearly in a second linear direction (Y-) of the second direction (Y) due to the rotational motion of the pinion gear (PG) in a first rotational direction. Conversely, the second rack gear portion 223b may move linearly in a 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] According to an embodiment, the second rack gear unit 223b may include a second rack gear bar RGB2, a 2-1 rack gear RG21, and a 2-2 rack gear RG22.

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

[0199] The 2-1 rack gear (RG21) may protrude (or extend) from the other side (or upper side) of the second rack gear bar (RGB2) and be connected (or meshed) with the pinion gear (PG). For example, the 2-1 rack gear (RG21) may protrude (or extend) from the other side (or upper side) of the second rack gear bar (RGB2) along the second direction (Y) to overlap with the second pinion gear (PG2) of the pinion gear (PG), and may be connected (or meshed) with the first pinion gear (PG1) of the pinion gear (PG).

[0200] In one embodiment, the 2-1 rack gear (RG21) is formed on the inner surface of the second protrusion protruding (or extending) 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 2-2 rack gear (RG22) may be formed at one end (or lower end) of the second rack gear bar (RGB2) and connected (or meshed) with the rotation link unit 224. For example, the 2-2 rack gear (RG22) may be formed at one end (or lower end) of the second rack gear bar (RGB2) along the second direction (Y) to have a preset pitch and connected (or meshed) with the rotation link unit 224. The 2-2 rack gear (RG22) may rotate the rotation link unit 224 by the linear motion of the second rack gear bar (RGB2).

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

[0203] The rotation link unit 224 can rotate by the linear motion of the linear drive unit 223 to rotate the arc member 210. By being rotatably fixed to the center of the arc member 210, the rotation link unit 224 can rotate by the linear motion of the linear drive unit 223 to rotate the arc member 210.

[0204] According to an embodiment, the rotation link unit 224 may include a first rotation link gear 224a and a second rotation 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 by linear motion of the first rack gear portion 223a of the linear drive portion 223, thereby rotating the first arc member 211. For example, the first rotating link gear 224a can rotate the first arc member 211 by 90 degrees in the first rotation direction by rotating in the first rotation direction by linear motion of the first rack gear portion 223a along the first linear direction (Y+). Conversely, the first rotating link gear 224a can rotate the first arc member 211 by 90 degrees in the second rotation direction by rotating in the second rotation direction by linear motion of the first rack gear portion 223a along the second linear direction (Y-). For example, the first rear area (RA1) of the display device 100 can be deformed into a curved shape having a curvature greater than 0 (zero) by the rotation of the first arc member 211 in a first rotational direction accompanying the rotation of the first rotating link gear 224a in a first rotational direction, and can be deformed into or returned to a flat shape having a curvature of 0 (zero) by the rotation of the first arc member 211 in a second rotational direction due to the rotation of the first rotating link gear 224a in a second rotational direction while the first arc member 211 is rotating in the first rotational direction.

[0206] According to an embodiment, the first rotating link gear 224a may include a plurality of pinion spur gears (PSGs) that are coupled (or meshed) with the first rack gear portion 223a. For example, the first rotating link gear 224a may include a plurality of pinion spur gears (PSGs) that are realized on less than half of the circumferential surface, so that the first rotating link gear 224a may 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 can rotate the second arc member 213 by being rotated by the linear motion of the second rack gear portion 223b of the linear drive portion 223. For example, the second rotating link gear 224b can rotate the second arc member 213 by 90 degrees in the second rotation direction by being rotated in the second rotation direction by the linear motion of the second rack gear portion 223b along the second linear direction (Y-). Conversely, the second rotating link gear 224b can rotate the second arc member 213 by 90 degrees in the first rotation direction by being rotated in the first rotation direction by the linear motion of the second rack gear portion 223b along the first linear direction (Y+). For example, the second rear area (RA2) of the display unit 100 can be deformed into a curved shape having a curvature greater than 0 (zero) by the rotation of the second arc member 213 in a second rotational direction accompanying the rotation of the second rotating link gear 224b in the second rotational direction, and can be deformed into or returned to a flat shape having a curvature of 0 (zero) by the rotation of the second arc member 213 in a first rotational direction due to the rotation of the second rotating link gear 224b in the first rotational direction when the second arc member 213 rotates in the second rotational direction.

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

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

[0210] According to an embodiment, the holder portion 225 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 in parallel with each other, sandwiching the first rack gear portion 223a and the first rotating link gear 224a, respectively, and can rotatably support the first arc member 211 of the arc member 210. 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 in parallel with each other, sandwiching the second rack gear portion 223b and the second rotating link gear 224b, respectively, to rotatably support the second arc member 213 of the arc member 210. For example, the second arc member 213 may pass through each of the pair of second holders 225b and be rotatably supported by each of the pair of second holders 225b.

[0213] In one embodiment, the holder part 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 driving unit 220 of the curvature varying device 200 according to an embodiment of the present disclosure may further include a guide rail unit 227 .

[0215] The guide rail portion 227 is disposed between the support plate 221 and the linear driving portion 223 and can guide the linear motion of the linear driving portion 223 .

[0216] In one embodiment, the guide rail portion 227 may include a first guide rail 227a arranged between the support plate 221 and the first rack gear portion 223a of the linear driving portion 223, and a second guide rail 227b arranged between the support plate 221 and the second rack gear portion 223b of the linear driving portion 223.

[0217] The first guide rail 227a can guide the sliding of the first rack gear bar (RGB1) of the first rack gear portion 223a. For example, the first guide rail 227a can be disposed on the support plate 221 to have a guide groove. In this case, the first rack gear bar (RGB1) of the first rack gear portion 223a can include a slide protrusion that is slidably inserted into the guide groove of the first guide rail 227a. This allows the first rack gear portion 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 portion 223b. For example, the second guide rail 277b can be disposed on the support plate 221 to have a guide groove. In this case, the second rack gear bar (RGB2) of the second rack gear portion 223b can include a slide protrusion that is slidably inserted into the guide groove of the second guide rail 277b. This allows the second rack gear portion 223b to move linearly on the second guide rail 277b by the rotation of the pinion gear (PG).

[0219] The driving unit 220 of the curvature varying device 200 according to an embodiment of the present specification may further include a limit switch unit 228.

[0220] The limit switch unit 228 is disposed 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] According to one embodiment, the limit switch portion 228 may include a first limit switch portion 228a and a second limit switch portion 228b.

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

[0223] The first limit switch portion 228a according to one embodiment may include a first switch contact portion (SCP1) formed on an outer wall of the first rack gear portion 223a, a 1-1 limit switch (LS11) contacting one side of the first switch contact portion (SCP1), and a 1-2 limit switch (LS12) contacting the other side of the first switch contact portion (SCP1).

[0224] The first switch contact portion (SCP1) may include a recess (or a protrusion) formed on an outer wall of the first rack gear bar (RGB1) adjacent to the first-second rack gear (RG12) of the first rack gear portion 223a. For example, the first switch contact portion (SCP1) may be recessed into 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) may 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 1-1 stopper (SP11) that contacts the 1-1 limit switch (LS11) by the linear motion (Y-) of the first rack gear bar (RGB1).

[0226] The other side of the first switch contact portion (SCP1) may be formed to be inclined at a certain angle from an outer wall of the first rack gear bar (RGB1) spaced apart from one side of the first switch contact portion (SCP1) along the second direction (Y). 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-2 stopper (SP12) that contacts the first-2 limit switch (LS12) by the linear motion (Y+) of the first rack gear bar (RGB1).

[0227] The 1-1 limit switch (LS11) may generate a 1-1 limit signal and provide it to the curvature variable control circuit when it physically contacts a 1-1 stopper (SP11) formed on the first rack gear part 223a that moves linearly along the second linear direction (Y-). The curvature variable control circuit may stop the rotation of the rotation motors 222a and 222b in response to the 1-1 limit signal provided from the 1-1 limit switch (LS11).

[0228] The first-second limit switch (LS12) generates a first-second limit signal when it comes into physical contact with a first-second stopper (SP12) formed on the first rack gear part 223a that moves linearly along the first linear direction (Y+), and provides the first-second limit signal to the curvature variable control circuit. The curvature variable control circuit can stop the rotation of the rotation motors 222a and 222b in response to the first-second limit signal provided from the first-second limit switch (LS12).

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

[0230] The second limit switch portion 228b according to one embodiment may include a second switch contact portion (SCP2) formed on an outer wall of the second rack gear portion 223b, a second-1 limit switch (LS21) in contact with one side of the second switch contact portion (SCP2), and a second-2 limit switch (LS22) in contact with the other side of the second switch contact portion (SCP2).

[0231] The second switch contact portion (SCP2) may include a recess (or protrusion) formed on an 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 recessed on 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) by 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 from an outer wall of the second rack gear bar (RGB2) spaced apart from one side of the second switch contact portion (SCP2) along the second direction (Y). For example, the other side of the second switch contact portion (SCP2) may be formed to have an inclined surface and may be a second-second stopper (SP22) that contacts the second-second limit switch (LS22) by the linear motion (Y+) of the second rack gear bar (RGB2).

[0234] The 2-1 limit switch (LS21) generates a 2-1 limit signal when it comes into physical contact with a 2-1 stopper (SP21) formed on the second rack gear part 223b that moves linearly along the first linear direction (Y+), and provides the 2-1 limit signal to the curvature variable control circuit. The curvature variable control circuit can stop the rotation of the rotation motors 222a and 222b in response to the 2-1 limit signal provided from the 2-1 limit switch (LS21).

[0235] The second-second limit switch (LS22) generates a second-second limit signal when it comes into physical contact with a second-second stopper (SP22) formed on the second rack gear part 223b that moves linearly along the second linear direction (Y-), and provides the second-second limit signal to the curvature variable control circuit. The curvature variable control circuit can stop the rotation of the rotation motors 222a and 222b in response to the second-second limit signal provided from the second-second limit switch (LS22).

[0236] The driving unit 220 of the curvature varying device 200 according to an embodiment of the present disclosure may further include a sliding guide unit 229 .

[0237] The sliding guide portion 229 may be realized so that the linear driving portion 223 moves linearly along the second direction (Y) without floating.

[0238] According to an embodiment, the sliding guide portion 229 may include a pair of first sliding guides 229a and a pair of second sliding guides 229b.

[0239] The pair of first slide guides 229a may be disposed on the support plate 221 with the first rack gear portion 223a therebetween. Each of the pair of first slide guides 229a may cover an end portion of the upper surface of the first rack gear portion 223a and an outer wall. For example, each of the pair of first slide guides 229a may include a side wall portion covering the outer wall of the first rack gear portion 223a and a front portion covering an end portion of the upper surface of the first rack gear portion 223a. Such a pair of first slide guides 229a may guide the linear motion of the first rack gear portion 223a through the side wall portion and prevent the first rack gear portion 223a, which moves linearly, from floating through the front portion.

[0240] The pair of second slide guides 229b may be disposed on the support plate 221 with the second rack gear portion 223b therebetween. Each of the pair of second slide guides 229b may cover an end portion of the upper surface and an outer wall of the second rack gear portion 223b. For example, each of the pair of second slide guides 229b may include a side wall portion covering the outer wall of the second rack gear portion 223b and a front portion covering an end portion of the upper surface of the second rack gear portion 223b. Such a pair of second slide guides 229b may guide the linear motion of the second rack gear portion 223b through the side wall portion and prevent the second rack gear portion 223b, which moves linearly, from floating through the front portion.

[0241] The curvature varying device 200 according to another example of the present specification may further include a gear box cover 290.

[0242] The gearbox cover 290 may be implemented to couple to the support plate 221 and cover a central portion of the drive section 220. The gearbox cover 290 may be supported or attached to a post of a stand.

[0243] FIG. 12A is a cross-sectional view showing a planar form of a display device according to the present disclosure, and FIG. 12B is a cross-sectional view showing a curvature-variable state of the display device according to the present disclosure.

[0244] 12A, in the display device according to the present 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 Fig. 9 to Fig. 11, the rotation motors 222a and 222b of the curvature varying device 200 may 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 flat display device 100 may be arranged (or realized) in a curved shape having a curvature (R1) other than zero as shown in Figures 1, 2, and 12B in response to a user's operation. For example, the arc member 210 of the curvature variable device 200 rotates up to 90 degrees at a predetermined position in conjunction with the rotational movement of the rotation motors 222a and 222b according to the user's operation while being laid down parallel to the rear surface of the display device 100, and is raised in the thickness direction (Z) of the display device 100. A pressure force generated at the tip of the arc member 210 that is raised while rotating is applied to the display device 100 via the fixing bracket 240, and thus both sides of the display device 100 may protrude toward the front (FD) of the display device more than the center. Finally, the display unit 100 may be deformed into a curved shape having a curvature (R1) other than O (zero) by protruding both sides of the display unit 100 toward the front (FD) of the display device more than the center due to the rotational movement of the arc member 210 raised in the thickness direction (Z) of the display unit 100. For example, as shown in Figs. 9 to 11, the rotation motors 222a and 222b of the curvature varying device 200 that deforms the display unit 100 into a curved shape may stop their rotational movement based on the 1-2 limit signal of the first limit switch unit 228a and the 2-2 limit signal of the second limit switch unit 228b.

[0246] Conversely, the arc member 210 of the curvature variable device 200 rotates up to 90 degrees at a predetermined position in conjunction with the rotational movement of the rotary motors 222a, 222b in response to the user's operation from a state in which it is raised in the thickness direction (Z) of the display device 100, and then tilts sideways parallel to the rear surface of the display device 100, so that the display device 100 can be positioned (or realized) in a planar form having a curvature (R0) of O (zero) due to the elastic restoring force.

[0247] FIG. 13 is a diagram for explaining a position adjustment device in a display device according to an embodiment of the present specification.

[0248] Referring to FIG. 13, a position adjustment device 700 according to one embodiment of the present specification can be realized so that the height of the display unit 100 attached to the stand 300 can be raised (Y+) or lowered (Y-).

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

[0250] The support bracket 710 may be coupled to the rear surface of the display device 100. The support bracket 710 according to an embodiment of the present specification may be coupled to the gear box cover 290 of the curvature variable device 200 disposed on the rear surface of the display device 100 shown in Figures 5, 6, and 9. For example, the support bracket 710 may be coupled to the gear box cover 290 or support the gear box cover 290 by a fastening member such as a screw or a bolt.

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

[0252] A display lifting device 720 according to an embodiment of the present disclosure may include a connection frame 721 , a lifting shaft 723 , a lifting guide 725 , and a lifting adjustment knob 727 .

[0253] The connection frame 721 is disposed in the thickness direction (Z) of the display device 100 and can be coupled to the support bracket 710 by penetrating the inner wall of the post 330 of the stand 300 .

[0254] The lift shaft 723 is disposed inside the post 330 in a manner that allows it to be lifted and lowered in parallel with the second direction (Y), and may be coupled to the connection frame 721 .

[0255] The lifting guide 725 is disposed inside the post 330 parallel to the second direction (Y) and can guide the lifting and lowering of the lifting shaft 723. For example, the lifting guide 725 can include a guide rail that guides the lifting and lowering of the lifting shaft 723. 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 be lifted and lowered in the second direction (Y) along the guide rail of the lifting guide 725.

[0256] The lift adjustment knob 727 may be rotatably disposed on the upper surface of the post 330 and connected to the upper side of the lift shaft 723. The lift adjustment knob 727 may be rotated in a first rotation direction by a user's operation to raise the lift shaft 723 (Y+), and may be rotated in a second rotation direction by a user's operation to lower the lift shaft 723 (Y-). To this end, the lift adjustment knob 727 may include a screw thread portion 727a, and the lift shaft 723 may include a screw hole 725a disposed on an upper side and connected (or meshed) with the screw thread portion 727a of the lift adjustment knob 727.

[0257] The screw thread portion 727a of the lift adjustment knob 727 rotates with the rotation of the lift adjustment knob 727, and can linearly move the lift shaft 723 in the second direction (Y). For example, when the lift adjustment knob 727 rotates in a first rotation direction, the screw thread portion 727a rotates in the first rotation direction, and can linearly move (or lift) the lift shaft 723 in the second direction (Y). Conversely, when the lift adjustment knob 727 rotates in the second rotation direction, the screw thread portion 727a rotates in the second rotation direction, and can linearly move (or lift) the lift shaft 723 in the second direction (Y).

[0258] The position adjustment device 700 according to an embodiment of the present specification can be realized to tilt the display unit 100 at a certain angle (θ1, θ2) from the vertical state (Pv) attached to the stand 300. For this purpose, the position adjustment device 700 can further include a display tilt device 730.

[0259] The display tilt device 730 is disposed between the support bracket 710 and the display lift device 720, and can tilt the display device 100 at a certain angle (θ1, θ2) according to a user's operation.

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

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

[0262] The support frame 733 may be supported (or coupled) by the connection frame 721 of the display lifting device 720 and rotatably supported by the tilt housing 731. The tilt housing 731 may be rotatably supported by the support frame 733 via a tilt shaft 732.

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

[0264] The tilt adjustment knob 737 may be disposed on the back of the tilt housing 731 so as to couple (or mate) with the ball nut 735. The tilt adjustment knob 737 may include a ball screw that passes through the back of the tilt housing 731 and couples (or mates) with the ball nut 735.

[0265] The tilt adjustment knob 737 can be rotated in a first rotation direction by a user to advance the ball nut 735 in the thickness direction (Z) of the display device 100, thereby tilting the tilt housing 731 at a first angle (θ1) around the tilt shaft 732 as a rotation axis. For example, when the tilt adjustment knob 737 is rotated in the first rotation direction, the display device 100 in the vertical state (Pv) can be tilted at the first angle (θ1) from the vertical state (Pv) by the upper part protruding forward of the display device more than the lower part.

[0266] Conversely, the tilt adjustment knob 737 can be rotated in a second rotation direction by the user to move the ball nut 735 backward in the thickness direction (Z) of the display device 100, thereby returning the tilt housing 731 to the vertical state (Pv) or tilting it at a second angle (θ2) from the vertical state (Pv) around the tilt shaft 732 as a rotation axis. For example, when the tilt adjustment knob 737 is rotated in the second rotation direction, the lower part of the display device 100 protrudes forward from the upper part of the display device, so that the display device 100 in the vertical state (Pv) can be tilted at a second angle (θ2) from the vertical state (Pv).

[0267] Knob support portion 739 may be coupled to the upper side of support frame 733 or may protrude from the upper side of support frame 733 to rotatably support tilt adjustment knob 737. Knob support portion 739 may rotatably support a protruding shaft protruding from the rear surface of tilt adjustment knob 737. As a result, tilt adjustment knob 737 can move linearly by rotating at that position using knob support portion 739 as a support base.

[0268] In this manner, the display device including the position adjustment device 700 of this embodiment 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] Fig. 14 is an exploded perspective view showing a display device according to another example of the present specification, Fig. 15 is a view showing a curvature variable device and a vibration device arranged on the back surface of the display unit shown in Fig. 14, and Fig. 16 is a cross-sectional view taken along line III-III' shown in Fig. 14, which shows a display unit structure modified from that of the display devices shown in Figs. 1 to 13. Therefore, in the following description, the remaining components except for the display unit are given the same reference numerals, and the accompanying duplicated description will be omitted or simplified.

[0270] 14 to 16, in a display device according to another embodiment of the present disclosure, the display device 100 may further include a groove 127 for receiving the variable curvature device 200. In the embodiment of the display device 100 shown in FIG.

[0271] The groove 127 may be formed as a recess from the rear surface of the display device 100 to accommodate the curvature variable device 200. For example, the groove (home) 127 may accommodate the curvature variable device 200, thereby reducing the thickness of the display device.

[0272] According to an embodiment, the groove 127 may include a first groove 127 a recessed from the rear surface of the display device 100 so as to overlap with the curvature varying device 200 .

[0273] The first groove 127a may be recessed from the back cover 120 overlapping with the driving unit 220 of the curvature varying device 200. For example, the first groove 127a may be recessed from the back cover 120 by protruding from the back cover 120 to the rear side of the display panel 110. The groove 127 protrudes from the back cover 120 to the rear side of the display panel 110 to have a shape extended long along the second direction (Y), thereby reinforcing the rigidity of the display device 100 without affecting the change in curvature of the display device 100 in which both sides of the display device 100 protrude toward the front (FD) of the display device based on the first direction (X). For example, if the groove 127 is formed in a shape extended long along the first direction (X) other than the second direction (Y), it may be difficult or impossible to change the curvature of the display device 100 due to the reinforcement of the rigidity of the display device 100 by the groove 127. In this manner, the first groove 127a can be expressed as a recess, a carved portion, a housing portion, a storage portion, a rigidity reinforcing portion, a space dividing portion, a forming portion, or the like, and is not limited to the terminology.

[0274] The first groove 127a may 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 rear surface of the back cover 120 may be the same as or larger 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 rear surface of the back cover 120 may be the same as or larger 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 varying device 200 according to an embodiment may be disposed (or coupled) to the rear 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 embodiment, the plate fixing member may be an elastic adhesive resin, double-sided tape, or a double-sided adhesive foam pad for shock absorption. When the plate fixing member has elasticity, it is possible to prevent or minimize the vibration generated by the operation of the curvature varying device 200 from being transmitted to the back cover 120.

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

[0277] The first groove 127a may spatially separate the rear area of ​​the display unit 100 into a left rear area (LRA) and a right rear area (RRA) in a direction of viewing the rear of the display unit 100. For example, the first groove 127a, together with the intermediate member 150, spatially separates the first vibration area and the second vibration area of ​​the display panel 110 by spatially separating the rear area of ​​the display unit 100 into a left rear area (LRA) and a right rear area (RRA), thereby preventing or minimizing mutual interference between the first vibration area and the second vibration area, and improving the characteristics of the sound generated by the vibration of the display panel 110. The first groove 127a and the intermediate member 150 may be expressed as a space dividing portion or a partition member, and are not limited to the terms.

[0278] According to an embodiment, the groove 127 may further include a second groove 127 b and a third groove 127 c recessed from the rear surface of the display device 100 to overlap with the fixing bracket 240 of the curvature varying device 200 .

[0279] The second groove 127b may be recessed from the back cover 120 overlapping with the first and third fixing brackets 241, 243 of the curvature varying device 200. For example, the second groove 127b may be recessed in the back cover 120 by protruding from the back cover 120 to the rear side of the display panel 110. For example, the second groove 127b may be recessed from the edge portion of the first rear surface of the back cover 120 along the second direction (Y) to accommodate both the first and third fixing brackets 241, 243, thereby reinforcing the rigidity of the end portion of the display unit 100 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 rear surface of the back cover 120 may be the same as the distance (or height) between the bottom of the first groove 127a and the rear surface of the back cover 120 or may be substantially the same within a process tolerance range. For example, the center of the arc member 210 disposed on the rear surface of the back cover 120 may be close to the rear surface of the back cover 120 by an insertion depth to which the driving unit 220 of the curvature varying device 200 is inserted into the first groove 127a. Thus, by inserting each of the first and third fixing brackets 241 and 243 into the second groove 127b, the distance between each of the center and one end of the arc member 210 and the rear surface of the back cover 120 may be kept constant, or the center and one end of the arc member 210 may be balanced.

[0281] The third groove 127c may be recessed from the back cover 120 overlapping with the second and fourth fixing brackets 242, 244 of the curvature varying device 200. For example, the third groove 127c may be recessed in the back cover 120 by protruding from the back cover 120 to the rear side of the display panel 110. For example, the third groove 127c may be recessed from an edge portion of the second rear surface of the back cover 120 along the second direction (Y) to accommodate both the second and fourth fixing brackets 242, 244, thereby reinforcing the rigidity of the end portion of the display unit 100 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 rear surface of the back cover 120 may be the same as the distance (or height) between the bottom of the first groove 127a and the rear surface of the back cover 120 or may be substantially the same within a process tolerance range. For example, the center of the arc member 210 disposed on the rear surface of the back cover 120 may be close to the rear surface of the back cover 120 by an insertion depth to which the driving unit 220 of the curvature varying device 200 is inserted into the first groove 127a. Thus, by inserting each of the second and fourth fixing brackets 242 and 244 into the third groove 127c, the distance between each of the center and other end of the arc member 210 and the rear surface of the back cover 120 may be kept constant, or the center and other end of the arc member 210 may be balanced.

[0283] Each of the second groove 127b and the third groove 127c may be connected or coupled to the rear surface of the display panel 110 via a cover connecting member 130. For example, the cover connecting member 130 may be disposed or interposed between each of the second groove 127b and the third groove 127c and the display panel 110.

[0284] 1 to 13, the display device according to another embodiment of the present specification can maximize the immersive viewing experience of the viewer through the display unit 100 (or display screen) curved in a curved shape, and can maximize the immersive viewing experience of the user (or viewer) through sound generated by vibration of the display panel 110. In addition, the display device according to another embodiment of the present specification can have a thin thickness and reinforce the rigidity of the display unit 100 by further including a groove 127 for accommodating the curvature variable device 200, and can improve the characteristics of sound generated by vibration of the display panel 110 and realize stereo sound by spatially dividing the first vibration region and the second vibration region of the display panel 110 by the groove 127 and the intermediate member 150.

[0285] Fig. 17 is an exploded perspective view showing a display device according to still another example of the present specification, and Fig. 18 is a cross-sectional view taken along line IV-IV' shown in Fig. 17, in which the vibration device is changed from the display device shown in Figs. 1 to 13. Therefore, in the following description, the remaining components except for the vibration device are given the same reference numerals, and the accompanying duplicated description will be omitted or simplified.

[0286] 1, 17 and 18, in a display device according to another example of the present specification, the vibration device 500 may be realized inside the display device 100.

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

[0288] The vibration device 500 can be disposed or realized in the air gap (AG) between the display panel 110 and the back cover 120 to cause the display panel 110 to vibrate.

[0289] The vibration device 500 according to an embodiment is connected (or coupled) to the rear surface 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. Alternatively, the vibration device 500 can be disposed on the back cover 120 facing the rear surface of the display panel 110, generate sound pressure in the air gap (AG), and vibrate the display panel 110 by the sound pressure. For example, the vibration device 500 can indirectly vibrate the display panel 110.

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

[0291] The vibrating device 500 may be connected (or bonded) to the rear surface of the display panel 110 via an adhesive member 590. The adhesive member 590 may include, but is not limited to, a double-sided tape, a double-sided foam tape, a double-sided foam pad, a double-sided foam pad tape, a double-sided adhesive pad, a double-sided adhesive gap pad, or a double-sided adhesive foam pad, each including an adhesive resin or having an adhesive layer. For example, the adhesive resin or adhesive layer of the adhesive member 590 may include, but is not limited to, an acrylic-based or urethane-based adhesive material. For example, the adhesive resin or adhesive layer of the adhesive member 590 may include, but is not limited to, an acrylic-based adhesive material having a relatively high hardness characteristic, compared to a urethane-based adhesive material having a relatively soft characteristic, so that the vibration of the vibrating device 500 is transmitted to the display panel 110 without loss.

[0292] According to an embodiment, the vibration device 500 may include a first vibration generator 550 and a second vibration generator 570 .

[0293] The first vibration generator 550 may be realized to vibrate a first vibration area (LRA) of the display panel 110. For example, the first vibration generator 550 may be coupled (or joined) to a rear surface of the display panel 110 corresponding to the first vibration area (LRA) of the display panel 110 via an adhesive member 590.

[0294] The first vibration generator 550 may include a piezoelectric element (or a piezoelectric material) having piezoelectric properties, and may be realized to vibrate the first vibration area (LRA) of the display panel 110. For example, the first vibration generator 550 may be connected (or coupled) to a rear surface of the display panel 110 corresponding to the first vibration area (LRA) of the display panel 110 via an adhesive member 590. Such a first vibration generator 550 vibrates the first vibration area (LRA) of the display panel 110, and thus a first sound (or left sound) generated by the vibration of the first vibration area (LRA) of the display panel 110 may be output to the front (FD) of the display device.

[0295] The second vibration generator 570 may be realized to vibrate a second vibration area (RRA) of the display panel 110. For example, the second vibration generator 570 may be coupled (or joined) to a rear surface of the display panel 110 corresponding to the second vibration area (RRA) of the display panel 110 via an adhesive member 590.

[0296] The second vibration generator 570 may include a piezoelectric element (or a piezoelectric material) having piezoelectric properties, and may be realized to vibrate the second vibration area (RRA) of the display panel 110. For example, the second vibration generator 570 may be connected (or coupled) to a rear surface of the display panel 110 corresponding to the second vibration area (RRA) of the display panel 110 via an adhesive member 590. Such a second vibration generator 570 may vibrate the second vibration area (RRA) of the display panel 110, and thereby output a second sound (or right sound) generated by the vibration of the second vibration area (RRA) of the display panel 110 to the front (FD) of the display device.

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

[0298] As such, the display device according to another example of the present specification may have the same effect as the display device shown in Figures 1 to 13. In addition, the display device according to another example of the present specification may have a thin thickness since the vibration device 500 is realized inside the display device 100, and there is no mechanical interference between the vibration device 500 and the curvature variable device 200, so that the degree of freedom in designing each of the vibration device 500 and the curvature variable device 200 may be improved.

[0299] Fig. 19 is an exploded perspective view showing a display device according to still another example of the present specification, and Fig. 20 is a cross-sectional view taken along line V-V' shown in Fig. 19, which is obtained by changing the vibration device in the display devices shown in Figs. 14 to 16. Therefore, in the following description, the remaining components except for the vibration device are given the same reference numerals, and the accompanying duplicated description will be omitted or simplified.

[0300] 1, 19 and 20, in a display device according to another example of the present specification, the vibration device 500 may be realized inside the display device 100.

[0301] The vibration device 500 may be realized to output sound (PVS) generated by vibration of the display panel 110 to the front (FD) of the display device using the display panel 110 as a diaphragm. Such a vibration device 500 is substantially the same as the vibration device 500 described in Figs. 17 and 18, so a duplicated description thereof will be omitted or simplified.

[0302] According to an embodiment, the vibration device 500 may include a first vibration generator 550 and a second vibration generator 570 .

[0303] The first vibration generator 550 may be realized to vibrate a first vibration area (LRA) of the display panel 110. For example, the first vibration generator 550 may be connected (or coupled) to a rear surface of the display panel 110 corresponding to the first vibration area (LRA) of the display panel 110 via an adhesive member 590. The first vibration generator 550 is substantially the same as the first vibration generator 550 described in FIGS. 17 and 18, and therefore a duplicated description thereof will be omitted.

[0304] The second vibration generator 570 may be realized to vibrate a second vibration area (RRA) of the display panel 110. For example, the second vibration generator 570 may be connected (or coupled) to a rear surface of the display panel 110 corresponding to the second vibration area (RRA) of the display panel 110 via an adhesive member 590. The second vibration generator 570 is substantially the same as the second vibration generator 570 described in FIGS. 17 and 18, and therefore a duplicated description thereof will be omitted.

[0305] The first vibration area (LRA) and the second vibration area (RRA) of the display panel 110 are spatially separated by the first groove 127a of the groove portion 127 described above and an intermediate member 150 between the first groove 127a and the display panel 110, thereby preventing or minimizing mutual interference between the first and second sounds and improving the characteristics of the sounds generated by the vibration of the display panel 110.

[0306] As described above, the display device according to the other example of the present specification may have the same effects as the display device shown in Figures 14 to 16. In addition, the display device according to the other example of the present specification may additionally have the same effects as the display device shown in Figures 17 and 18. In addition, the display device according to the other example of the present specification may have a thinner thickness by further including a groove 127 for accommodating the curvature variable device 200, and the rigidity of the display device 100 may be reinforced. The groove 127 and the intermediate member 150 may spatially divide the first vibration area (LRA) and the second vibration area (RRA) of the display panel 110, thereby improving the characteristics of the sound generated by the vibration of the display panel 110 and realizing stereo sound.

[0307] FIG. 21 is a diagram showing a vibration generator according to one embodiment of the present specification, and is a diagram for explaining the first and second vibration generators shown in FIGS. 17 to 20. As shown in FIG.

[0308] Referring to FIG. 12, each of a first vibration generator 550 and a second vibration generator 570 according to an embodiment of the present specification may include a piezoelectric vibration part 551, a first electrode part (E1), and a second electrode part (E2).

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

[0310] The piezoelectric vibrating part 551 is made of a transparent, semi-transparent, or opaque piezoelectric material (or electroactive material), and may be transparent, semi-transparent, or opaque. The piezoelectric vibrating part 551 may be made of a ceramic-based material capable of realizing a relatively high vibration, or may be made of a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure may have a piezoelectric and inverse piezoelectric effect and may be a plate-like structure having orientation. The perovskite crystal structure may be represented by the chemical formula ABO3, in which the A site is made of a divalent metal element and the B site is made of a tetravalent metal element. As an example, in the chemical formula ABO3, the A site and the B site may be cations, and O may be an anion. For example, the perovskite-based crystal structure may include at least one of PbTiO3, PbZrO3, PbZrTiO3, BaTiO3, and SrTiO3, but is not limited thereto.

[0311] The piezoelectric vibrating part 551 according to an embodiment of the present specification may include, but is not limited to, a PZT (lead zirconate titanate)-based material including lead (Pb), zirconium (Zr), and titanium (Ti), or a PZNN (lead zirconate nickel niobate)-based material including 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 include lead (Pb).

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

[0313] The first electrode unit (E1) may be disposed on a first surface (or an upper surface) of the piezoelectric vibrating unit 551 and may be electrically connected to the first surface of the piezoelectric vibrating unit 551. For example, the first electrode unit (E1) may have a single electrode (or common electrode) shape disposed on the entire first surface of the piezoelectric vibrating unit 551. For example, the first electrode unit (E1) may have the same shape as the piezoelectric vibrating unit 551, but is not limited thereto. The first electrode unit (E1) according to an embodiment of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the transparent or semi-transparent 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), magnesium (Mg), or the like, or may be made of an alloy thereof.

[0314] The second electrode unit (E2) may be disposed on a second surface (or back surface) opposite to the first surface of the piezoelectric vibrating unit 551, and may be electrically connected to the second surface of the piezoelectric vibrating unit 551. For example, the second electrode unit (E2) may have a single electrode (or common electrode) shape disposed on the entire second surface of the piezoelectric vibrating unit 551. For example, the second electrode unit (E2) may have a larger size than the piezoelectric vibrating unit 551 and may have the same shape as the piezoelectric vibrating unit 551, but is not limited thereto. The second electrode unit (E2) according to the embodiment of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the second electrode unit (E2) may be made of the same material as the first electrode unit (E1), but is not limited thereto. As another example, the second electrode unit (E2) may be made of a material different from that of the first electrode unit (E1).

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

[0316] According to an embodiment of the present disclosure, the first vibration generator 550 and the second vibration generator 570 may further include a first protection member and a second protection member, respectively.

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

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

[0319] FIG. 22 is a diagram showing a vibration generator according to another embodiment of the present specification, and is a diagram for explaining the first and second vibration generators shown in FIGS. 17 to 20.

[0320] Referring to FIG. 22, each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of the present specification may be expressed as 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 film-type piezoelectric composite speaker, but is not limited thereto.

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

[0322] The piezoelectric vibrating portion 553 may include at least one of a piezoelectric material, a composite piezoelectric material, or an electroactive material that includes a piezoelectric effect. The piezoelectric vibrating portion 553 may be expressed by other terms such as a piezoelectric driving portion, a vibrating layer, a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a vibrating portion, a piezoelectric material portion, an electroactive portion, a piezoelectric structure, a piezoelectric composite layer, a piezoelectric composite, or a piezoelectric ceramic composite. The piezoelectric vibrating portion 553 is composed of a transparent, translucent, or opaque piezoelectric material, and may be transparent, translucent, or opaque.

[0323] The piezoelectric vibrating portion 553 according to the embodiment of the present specification may include a plurality of first portions 553a and a plurality of second portions 553b. For example, the plurality of first portions 553a and the plurality of second portions 553b may be arranged alternately and repeatedly along a first direction (X) (or a second direction (Y)). For example, the first direction (X) may be a horizontal direction of the piezoelectric vibrating portion 553. The second direction (Y) may be a vertical direction of the piezoelectric vibrating portion 553 intersecting with the first direction (X). Without being limited thereto, the first direction (X) may be a vertical direction of the piezoelectric vibrating portion 553, and the second direction (Y) may be a horizontal direction of the piezoelectric vibrating portion 553.

[0324] Each of the first portions 553a may be made of an inorganic material. The inorganic material may include the above-mentioned piezoelectric material. For example, each of the first portions 553a may be made of substantially the same piezoelectric material as the piezoelectric vibration portion 551 described in FIG. 21, and therefore, a duplicate description thereof will be omitted.

[0325] Each of the first portions 553a according to the embodiment of the present specification may be disposed between the second portions 553b. For example, the first portions 553a may have a first width (W1) parallel to the first direction (X) (or the second direction (Y)) and a length parallel to the second direction (Y) (or the first direction (X)). Each of the second portions 553b may have a second width (W2) parallel to the first direction (X) (or the second direction (Y)) and a length parallel to the second direction (Y) (or the first direction (X)). The first width (W1) may be the same as or different from the second width (W2). For example, the first width (W1) may be larger than the second width (W2). For example, the first portion 553a and the second portion 553b may include a line shape or a stripe shape having the same or different sizes. Therefore, by having a 2-2 complex, the piezoelectric vibration part 553 can have a resonant frequency of 20 kHz or less, but is not limited to this, and the resonant frequency of the piezoelectric vibration part 553 can be changed based on at least one or more of the shape, length, and thickness.

[0326] In the piezoelectric vibration unit 553, the plurality of first portions 553a and the plurality of second portions 553b may be arranged (or arrayed) next to each other on the same plane (or the same layer). Each of the plurality of second portions 553b may be connected or bonded to two adjacent first portions 553a. For example, each of the plurality of second portions 553b may be connected or bonded to the adjacent first portion 553a by being configured to fill the gap between the two adjacent first portions 553a. In this way, the piezoelectric vibration unit 553 may be expanded to a desired size or length by side-bonding (or connection) of the first portion 553a and the second portion 553b.

[0327] In the piezoelectric vibrating part 553, the width (W2) of each of the plurality of second parts 553b may be gradually reduced from the central part of the piezoelectric vibrating part 553 toward both edge parts (or both tips).

[0328] According to an embodiment of the present specification, the second portion 553b having the largest width (W2) among the plurality of second portions 553b may be located at a portion where the largest stress is concentrated when the piezoelectric vibration 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 may be located at a portion where the smallest stress is generated relatively when the piezoelectric vibration 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 may be located at a middle portion of the piezoelectric vibration portion 553. The second portion 553b having the smallest width (W2) among the plurality of second portions 553b may be located at both edge portions of the piezoelectric vibration portion 553. As a result, when the piezoelectric vibrating part 553 vibrates in the vertical direction (Z), it is possible to minimize the interference of sound waves or the overlap of resonance frequencies occurring at the part where the greatest stress is concentrated, thereby improving the dipping phenomenon of sound pressure occurring in the low frequency range and improving the flatness of the acoustic characteristics of the low frequency range. For example, the flatness of the acoustic characteristics may be the magnitude of deviation between the maximum sound pressure and the minimum sound pressure.

[0329] In the piezoelectric vibration part 553, the first portions 553a may have different sizes (or widths). For example, the size (or width) of each of the first portions 553a may gradually decrease or increase from the middle portion of the piezoelectric vibration part 553 toward both edge portions (or both ends) of the piezoelectric vibration part 553. In this case, the piezoelectric vibration part 553 may improve the sound pressure characteristics of the sound and expand the sound reproduction band due to various natural vibration frequencies caused by the vibration of each of the first portions 553a having different sizes.

[0330] Each of the second portions 553b may be disposed between the first portions 553a. As a result, the piezoelectric vibrating part 553 may increase vibration energy due to the link within the unit lattice of the first portions 553a by the second portions 553b, thereby improving vibration characteristics and ensuring piezoelectric characteristics and flexibility. For example, the second portions 553b may be one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but are not limited thereto.

[0331] The second portion 553b according to the embodiment of the present specification may be made of an organic material portion. For example, the organic material portion may be disposed between the inorganic material portions to absorb impacts applied to the inorganic material portions (or the first portion), and may improve the durability of the piezoelectric vibration portion 553 by releasing stress concentrated on the inorganic material portions, and may provide flexibility to the piezoelectric vibration portion 553 or the first vibration generator 550.

[0332] The second portion 553b according to the embodiment of the present specification may have a lower modulus of elasticity and viscoelasticity than the first portion 553a, thereby improving the reliability of the first portion 553a, which is vulnerable to impact due to the brittle characteristics of the first portion 553a. For example, the second portion 553b may be made of a material having a loss factor of 0.01 to 1 and a modulus of elasticity of 0.1 to 10 [GPa].

[0333] The organic material portion of the second portion 553b may include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material having a flexible characteristic compared to the inorganic material portion of the first portion 553a. For example, the second portion 553b may be expressed as a flexible adhesive portion, an expandable portion, a bending portion, a damping portion, or a ductile portion, but is not limited thereto.

[0334] The piezoelectric vibration section 553 according to the embodiment of the present specification can have the shape of a single thin film by arranging (or connecting) a plurality of first parts 553a and a second part 553b on the same plane. For example, the piezoelectric vibration section 553 can have a structure in which a plurality of first parts 553a are connected to one side. For example, the plurality of first parts 553a can have a structure in which they are connected by the entire piezoelectric vibration section 553. For example, the piezoelectric vibration section 553 can vibrate in the vertical direction by the first part 553a having vibration characteristics, and can bend into a curved shape by the second part 553b having flexibility. In addition, in the piezoelectric vibration section 553 according to the embodiment of the present 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 vibration section 553. As an example, in the case of a piezoelectric vibration section 553 that requires piezoelectric characteristics rather than flexibility, the size of the first part 553a can be configured to be larger than the size of the second part 553b. As another example, in the case of piezoelectric vibration part 553 that requires flexibility rather than piezoelectric characteristics, the size of second part 553b can be configured to be larger than the size of first part 553a. Therefore, since the size of piezoelectric vibration part 553 can be adjusted according to the required characteristics, there is an advantage that piezoelectric vibration part 553 can be easily designed.

[0335] The first electrode unit (E1) may be disposed on a first surface (or upper surface) of the piezoelectric vibrating unit 553. The first electrode unit (E1) may be commonly disposed or coupled to each first surface of the plurality of first portions 553a and each first surface of the plurality of second portions 553b, and may be electrically connected to each first surface of the plurality of first portions 553a. For example, the first electrode unit (E1) may have a single electrode (or common electrode) shape disposed on the entire first surface of the piezoelectric vibrating unit 553. For example, the first electrode unit (E1) may have substantially the same shape as the piezoelectric vibrating unit 553, but is not limited thereto. The first electrode unit (E1) according to the embodiments of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material.

[0336] The second electrode unit (E2) may be disposed on a second surface (or back surface) opposite to the first surface of the piezoelectric vibrating unit 553. The second electrode unit (E2) may be commonly disposed or coupled to the second surface of each of the plurality of first portions 553a and the second surface of each of the plurality of second portions 553b, and may be electrically connected to the second surface of each of the plurality of first portions 553a. The second electrode unit (E2) may have a single electrode (or common electrode) shape disposed over the entire second surface of the piezoelectric vibrating unit 553. For example, the second electrode unit (E2) may have the same shape as the piezoelectric vibrating unit 553, but is not limited thereto. The second electrode unit (E2) according to the embodiments of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material.

[0337] The piezoelectric vibrating part 553 may be polarized by a constant voltage applied to the first electrode part (E1) and the second electrode part (E2) in a constant temperature atmosphere or a temperature atmosphere that changes from high temperature to room temperature, but is not limited thereto. For example, the piezoelectric vibrating part 553 may vibrate by alternately repeating contraction and expansion due to an inverse piezoelectric effect caused by an acoustic signal (or a voice signal) applied from the outside to the first electrode part (E1) and the second electrode part (E2). For example, the piezoelectric vibrating part 553 may vibrate by a vertical vibration (d33) and a planar vibration (d31) due to the first electrode part (E1) and the second electrode part (E2). The piezoelectric vibrating part 553 may 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 embodiment of the present specification may further include a first protection member and a second protection member.

[0339] The first protective member is disposed on the first electrode portion (E1) to protect the first electrode portion (E1). For example, the first protective member may be made of a plastic material, a fiber material, or a wood material, but is not limited thereto.

[0340] The second protective member may be disposed on the second electrode portion (E2) to protect the second electrode portion (E2). For example, the second protective member may be made of, but is not limited to, a plastic material, a fiber material, or a wood material. For example, the first protective member may be made of the same material as the second protective member or a different material. One of the first protective member and the second protective member may be attached to or coupled with the display panel via an adhesive member.

[0341] Fig. 23 is a diagram showing a vibration generator according to another embodiment of the present specification, which is a modification of the piezoelectric vibration part described in Fig. 22. Therefore, in the following description, redundant descriptions of the remaining configuration except for the piezoelectric vibration part will be omitted or simplified.

[0342] Referring to FIG. 23, in each of the first vibration generator 550 and the second vibration generator 570 according to another embodiment of the present specification, the piezoelectric vibration part 553 may include a plurality of first portions 553a spaced apart from each other along the first direction (X) and the second direction (Y), and a second portion 553b arranged between the plurality of first portions 553a.

[0343] The first portions 553a may be arranged to be spaced apart from each other along the first direction (X) and the second direction (Y). For example, the first portions 553a may be arranged in a lattice shape having hexahedral shapes of the same size. Each of the first portions 553a may be made of substantially the same piezoelectric material as the first portion 553a described in FIG. 22, and therefore the same reference numerals are used to denote the same piezoelectric material, and a duplicate description thereof will be omitted.

[0344] The second portion 553b may be disposed between the first portions 553a along the first direction (X) and the second direction (Y). The second portion 553b may be connected to or bonded to the adjacent first portions 553a by filling the gap between two adjacent first portions 553a or surrounding each of the first portions 553a. According to the embodiment of the present specification, the width of the second portion 553b disposed between two adjacent first portions 553a along the first direction (X) may be the same as or different from the width of the first portion 553a. The width of the second portion 553b disposed between two adjacent first portions 553a along the second direction (Y) may be the same as or different from the width of the first portion 553a. The second portions 553b may be made of substantially the same organic material as the second portion 553b described in FIG. 22, and therefore the same reference numerals are given thereto, and a duplicated description thereof will be omitted.

[0345] Thus, the piezoelectric vibration section 553 of each 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 a 1-3 complex, but is not limited to this, and the resonant frequency of the piezoelectric vibration section 553 can be changed based on at least one or more of the shape, length, and thickness.

[0346] Fig. 24 is a diagram showing a vibration generator according to another embodiment of the present specification, which is a modification of the piezoelectric vibration part described in Fig. 22. Therefore, in the following description, redundant descriptions of the remaining configuration except for the piezoelectric vibration part will be omitted or simplified.

[0347] Referring to FIG. 24, in each of a first vibration generator 550 and a second vibration generator 570 according to another embodiment of the present specification, a piezoelectric vibration part 553 may include a plurality of first portions 553a spaced apart from each other along a first direction (X) and a second direction (Y), and a second portion 553b arranged between the plurality of first portions 553a.

[0348] Each of the first portions 553a according to the embodiment of the present specification may have a planar structure in the shape of a circle. For example, each of the first portions 553a may have a disk shape, but is not limited thereto. For example, each of the first portions 553a may have a point shape, including an ellipse shape, a polygonal shape, or a donut shape, etc.

[0349] The second portion 553b may be disposed between the first portions 553a along each of the first direction (X) and the second direction (Y). The second portion 553b may be configured to surround each of the first portions 553a, and may be coupled or bonded to a side surface of each of the first portions 553a. The first portions 553a and the second portions 553b may be disposed (or arranged) next to each other on the same plane (or in the same layer).

[0350] In each of the piezoelectric vibration units 553 of the first vibration generator 550 and the second vibration generator 570 according to another embodiment of the present specification, each of the first portions 553a may have a triangular planar structure instead of a circular planar structure. For example, each of the first portions 553a may have a triangular plate shape.

[0351] According to an embodiment of the present specification, among the plurality of first portions 553a, four adjacent first portions 553a may be disposed adjacent to each other to form a quadrangular shape (or a square shape). Each vertex of the four adjacent first portions 553a forming the quadrangular shape may be disposed adjacent to the center (or the exact center) of the quadrangular shape.

[0352] According to another example of the present specification, among the plurality of first portions 553a, six adjacent first portions 553a may be arranged adjacent to each other to form a hexagon (or a regular hexagon). Each vertex of the six adjacent first portions 553a forming the hexagon may be arranged adjacent to a center (or a regular center) of the hexagon.

[0353] FIG. 25 is a diagram showing a vibration generator according to another embodiment of the present specification, and FIG. 26 is a cross-sectional view taken along line VI-VI' shown in FIG. 25, showing the vibration generator shown in FIGS. 17 to 20.

[0354] 25 and 26, each of the first vibration generator 550 and the second vibration generator 570 according to other embodiments of the present specification can include at least one or more vibration generating units (or vibration modules) 550A, 550B, 550C, 550D, or a plurality of vibration generating units 550A, 550B, 550C, 550D. In FIG. 25 and FIG. 26, each of the first vibration generator 550 and the second vibration generator 570 includes four vibration generating units as an example, and each of the first vibration generator 550 and the second vibration generator 570 according to the embodiments of the present specification can be composed of two or more vibration generating modules.

[0355] Each of the vibration generating units 550A, 550B, 550C, and 550D may be disposed electrically separated from one another along each of the first direction (X) and the second direction (Y).

[0356] Each of the 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 vibration generating units 550A, 550B, 550C, and 550D can be arranged at regular intervals or tiled along each of the first direction (X) and the second direction (Y). Thus, each of the first vibration generator 550 and the second vibration generator 570 in which the 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 tiling vibration array, a tiling array module, or a tiling vibration film.

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

[0358] Each of the vibration generating units 550A, 550B, 550C, and 550D may be arranged at regular intervals or tiled to be realized as one vibration device (or single vibration device) that is driven in the form of a complete single unit, not driven independently. According to the embodiment of the present specification, the first separation distance (D1) between the vibration generating units 550A, 550B, 550C, and 550D based on the first direction (X) may be 0.1 mm or more and less than 3 cm, but is not limited thereto. Also, the second separation distance (D2) between the vibration generating units 550A, 550B, 550C, and 550D based on the second direction (Y) may be 0.1 mm or more and less than 3 cm, but is not limited thereto. For example, the first separation distance (D1) and the second separation distance (D2) may be the same as each other within the range of process error.

[0359] Each of the multiple vibration generating units 550A, 550B, 550C, and 550D can be arranged or tiled to have a separation distance (or interval) (D1, D2) of 0.1 mm or more and less than 3 cm, so that they can be driven as one vibration device, and the reproduction 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 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 of the low-frequency sound, for example, at 500 Hz or less, 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] According to an embodiment of the present specification, when multiple vibration generating units 550A, 550B, 550C, 550D are arranged with a spacing (D1, D2) of less than 0.1 mm or no spacing (D1, D2), the reliability of each of the vibration generating units 550A, 550B, 550C, 550D, or the first vibration generator 550 and the second vibration generator 570, may be reduced due to cracks or damage caused by physical contact between each other when each of the vibration generating units 550A, 550B, 550C, 550D vibrates.

[0361] According to the embodiment of the present specification, when the vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals (D1, D2) of 3 cm or more, the vibration generating units 550A, 550B, 550C, and 550D may not operate as one vibration device due to the independent vibrations of each of the vibration generating units 550A, 550B, 550C, and 550D. This may result in a decrease in the reproduction band and sound pressure characteristics of the sound generated in conjunction with the vibrations of the vibration generating units 550A, 550B, 550C, and 550D. For example, when the vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals (D1, D2) of 3 cm or more, the acoustic characteristics and sound pressure characteristics in the low frequency band, for example, below 500 Hz, may decrease.

[0362] According to an embodiment of the present 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, and therefore the acoustic characteristics and sound pressure characteristics may be degraded in the low frequency range, for example, below 200 Hz.

[0363] According to another example of the present specification, when the vibration generating units 550A, 550B, 550C, and 550D are arranged at intervals of 1 mm, the vibration generating units 550A, 550B, 550C, and 550D vibrate as one vibration device, thereby increasing the reproduction band of sound and increasing the sound pressure characteristics of low-frequency sound, for example, at 500 Hz or less. For example, when the 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 separation distance between the vibration generating units 550A, 550B, 550C, and 550D. As a result, the multiple vibration generating units 550A, 550B, 550C, and 550D can be driven as a large-area vibrating body by single-body vibration, and therefore the acoustic characteristics and sound pressure characteristics of the sound reproduction band and low-frequency band generated in conjunction with the large-area vibration of each of the first vibration generator 550 and the second vibration generator 570 can be increased or improved.

[0364] Therefore, in order to realize the single body vibration (or one vibration device) of the multiple vibration generating units 550A, 550B, 550C, 550D, the separation distance between the multiple vibration generating units 550A, 550B, 550C, 550D may be set to 0.1 mm or more and less than 3 cm. Also, in order to realize the single body vibration (or one vibration device) of the multiple vibration generating units 550A, 550B, 550C, 550D and increase the sound pressure characteristic of the low frequency range sound, the separation distance between the multiple vibration generating units 550A, 550B, 550C, 550D may 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 embodiment of the present specification may include first to fourth vibration generating units 550A, 550B, 550C, and 550D that are electrically separated and spaced apart from each other 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 2×2 format.

[0366] According to an embodiment of the present specification, the first and second vibration generating units 550A, 550B may be spaced apart from each other along the first direction (X). The third and fourth vibration generating units 550C, 550D may be spaced apart from each other along the first direction (X) and from the first and second vibration generating units 550A, 550B along the second direction (Y). The first and third vibration generating units 550A, 550C may face each other and be spaced apart from each other along the second direction (Y). The second and fourth vibration generating units 550B, 550D may face each other and be spaced apart from each other along the second direction (Y).

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

[0368] The piezoelectric vibrating part 353 may be made of a ceramic-based material capable of realizing a relatively high vibration. For example, the piezoelectric vibrating part 353 may have a 1-3 composite structure having a piezoelectric characteristic of a 1-3 vibration mode, or a 2-2 composite structure having a piezoelectric characteristic of a 2-2 vibration mode. For example, the piezoelectric vibrating part 353 may include a piezoelectric ceramic similar to the piezoelectric vibrating part 553 described in FIG. 21, or may include a first part 553a and a second part 553b similar to the piezoelectric vibrating part 553 described in one of FIG. 22 to FIG. 24, and therefore the same reference numerals are used therefor and a duplicated description thereof will be omitted.

[0369] According to an embodiment of the present disclosure, the piezoelectric vibrating portion 353 is made of a transparent, semi-transparent, or opaque piezoelectric material, and may be transparent, semi-transparent, or opaque.

[0370] The first electrode portion (E1) is disposed on a first surface of the piezoelectric vibration portion 353 and may be electrically connected to the first surface of the piezoelectric vibration portion 353. This is the same as the first electrode portion (E1) described in one of Figs. 21 to 24, so the same reference numerals are used to denote it and a duplicate description thereof will be omitted.

[0371] The second electrode portion (E2) is disposed on a second surface of the piezoelectric vibration portion 353 and may be electrically connected to the second surface of the piezoelectric vibration portion 353. This is the same as the second electrode portion (E2) described in one of Figs. 21 to 24, so the same reference numerals are used to denote it and a duplicate description thereof will be omitted.

[0372] According to another embodiment of the present disclosure, the first vibration generator 550 and the second vibration generator 570 may further include a first protective member 556 and a second protective member 557, respectively.

[0373] The first protective member 556 may be disposed on the first surface of each of the first vibration generator 550 and the second vibration generator 570. For example, the first protective member 556 covers the first electrode portion (E1) disposed on the first surface of each of the vibration generating units 550A, 550B, 550C, 550D, so that the first protective member 556 is commonly connected to the first surfaces of each of the vibration generating units 550A, 550B, 550C, 550D, or commonly supports the first surfaces of each of the vibration generating units 550A, 550B, 550C, 550D. This allows the second protective member 557 to protect the first surfaces or the first electrode portion (E1) of each of the vibration generating units 550A, 550B, 550C, 550D.

[0374] The first protective member 556 according to the embodiment of the present specification may be disposed on the first surface of each of the plurality of vibration generating units 550A, 550B, 550C, and 550D via the first adhesive layer 554. For example, the first protective member 556 may be disposed directly on the first surface of each of the plurality of vibration generating units 550A, 550B, 550C, and 550D by a film lamination process using the first adhesive layer 554 as an intermediary. Thus, the plurality of vibration generating units 550A, 550B, 550C, and 550D may be integrated (or disposed) or tiled with the first protective member 556 so as to have a certain interval (D1, D2).

[0375] The second protective member 557 may be disposed on the second surface of each of the first vibration generator 550 and the second vibration generator 570. For example, the second protective member 557 may be commonly connected to the second surfaces of each of the multiple vibration generating units 550A, 550B, 550C, and 550D by covering the second electrode portion (E2) disposed on the second surface of each of the multiple vibration generating units 550A, 550B, 550C, and 550D, or may commonly support the second surfaces of each of the multiple vibration generating units 550A, 550B, 550C, and 550D. This allows the second protective member 557 to protect the second surfaces or the second electrode portion (E2) of each of the multiple vibration generating units 550A, 550B, 550C, and 550D.

[0376] The second protective member 557 according to the embodiment of the present specification may be disposed on the second surface of each of the plurality of vibration generating units 550A, 550B, 550C, and 550D via the second adhesive layer 555. For example, the second protective member 557 may be disposed directly on the second surface of each of the plurality of vibration generating units 550A, 550B, 550C, and 550D by a film lamination process using the second adhesive layer 555 as an intermediary. Thus, the plurality of vibration generating units 550A, 550B, 550C, and 550D may be integrated (or disposed) with or tiled to the second protective member 557 so as to have a certain interval (D1, D2).

[0377] Each of the first and second protective members 556 and 557 according to the embodiment of the present specification may be made of, but is not limited to, a plastic material, a fiber material, or a wood material. One of the first protective member 556 and the second protective member 557 may be attached or coupled to the display panel via an adhesive member.

[0378] The first adhesive layer 554 may be disposed on the first surfaces of the plurality of vibration generating parts 550A, 550B, 550C, and 550D and between the plurality of vibration generating parts 550A, 550B, 550C, and 550D. For example, the first adhesive layer 554 may be formed on the rear 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, disposed on the first surfaces of the plurality of vibration generating parts 550A, 550B, 550C, and 550D, and filled between the plurality of vibration generating parts 550A, 550B, 550C, and 550D.

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

[0380] The first and second adhesive layers 554, 555 may be connected or bonded to each other between the multiple vibration generating units 550A, 550B, 550C, 550D. As a result, each of the multiple vibration generating units 550A, 550B, 550C, 550D may be surrounded by the first and second adhesive layers 554, 555. For example, the first and second adhesive layers 554, 555 may completely surround the entire multiple vibration generating units 550A, 550B, 550C, 550D. For example, the first and second adhesive layers 554, 555 may be expressed as a cover member, etc., but are not limited thereto. When the first and second adhesive layers 554, 555 are cover members, the first protective member 556 may be disposed on a first surface of the cover member, and the second protective member 557 may be disposed on a second surface of the cover member.

[0381] Each of the first and second adhesive layers 554, 555 according to the embodiment of the present specification may include an electrically insulating material that is compressible and resilient while having adhesive properties. For example, each of the first and second adhesive layers 554, 555 may include, but is not limited to, an epoxy resin, an acryl 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 the present specification may further include a first power supply line (PL1) arranged on the first protective member 556, a second power supply line (PL2) arranged on the second protective member 557, and a pad unit 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 disposed on a rear surface of the first protective member 556 facing the first surfaces of the first vibration generator 550 and the second vibration generator 570. The first power supply line (PL1) may be electrically connected to the first electrode units (E1) of the vibration generators 550A, 550B, 550C, and 550D. For example, the first power supply line (PL1) may be directly electrically connected to the first electrode units (E1) of the vibration generators 550A, 550B, 550C, and 550D. As an example, the first power supply line (PL1) may be electrically connected to the first electrode units (E1) of the vibration generators 550A, 550B, 550C, and 550D via an anisotropic conductive film. As another embodiment, the first power supply line (PL1) may be electrically connected to each of the first electrode portions (E1) of the plurality of 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 embodiment of the present specification may include first and second upper power lines (PL11, PL12) arranged along the second direction (Y). For example, the first upper power line (PL11) may be electrically connected to the first electrode unit (E1) of each of the first and third vibration generators 550A, 550C (or the first group, the first module group, or the first array group) arranged in a first row parallel to the second direction (Y) among the plurality of vibration generators 550A, 550B, 550C, 550D. The second upper power line (PL12) may be electrically connected to the first electrode unit (E1) of each of the second and fourth vibration generators 550B, 550D (or the second group, the second module group, or the second array group) arranged in a second row parallel to the second direction (Y) among the plurality of vibration generators 550A, 550B, 550C, 550D.

[0385] The second power supply line (PL2) may be disposed on a front surface of the second protective member 557 facing the second surfaces of the first vibration generator 550 and the second vibration generator 570. The second power supply line (PL2) may be electrically connected to the second electrode units (E2) of the vibration generators 550A, 550B, 550C, and 550D. For example, the second power supply line (PL2) may be directly electrically connected to the second electrode units (E2) of the vibration generators 550A, 550B, 550C, and 550D. As an example, the second power supply line (PL2) may be electrically connected to the second electrode units (E2) of the vibration generators 550A, 550B, 550C, and 550D via an anisotropic conductive film. In another embodiment, the second power supply line (PL2) may be electrically connected to each of the second electrode portions (E2) of the plurality of 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 embodiment of the present specification may include first and second lower power lines (PL21, PL22) arranged along the second direction (Y). For example, the first lower power line (P21) may be electrically connected to the second electrode unit (E2) of each of the first and third vibration generating units 550A, 550C (or the first group, the first module group, or the first array group) arranged in a first row parallel to the second direction (Y) among the plurality of vibration generating units 550A, 550B, 550C, 550D. The second lower power line (PL22) may be electrically connected to the second electrode unit (E2) of each of the second and fourth vibration generating units 550B, 550D (or the second group, the second module group, or the second array group) arranged in a second row parallel to the second direction (Y) among the plurality of vibration generating units 550A, 550B, 550C, 550D.

[0387] The pad unit 558 may be disposed on each of the first vibration generator 550 and the second vibration generator 570 so as to be electrically connected to at least one side (or one end) of the first power supply line (PL1) and the second power supply line (PL2). The pad unit 558 according to the embodiment of the present specification 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 commonly connected to one end of each of the first and second upper power lines (PL11, PL12) of the first power supply line (PL1). For example, one end of 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 commonly connected to one end of each of the first and second lower power lines (PL21, PL22) of the second power supply line (PL2). For example, one end of each of the first and second lower power lines (PL21, PL22) may branch off from the second pad electrode.

[0390] According to an embodiment of the present specification, each of the first power supply line (PL1), the second power supply line (PL2), and the pad portion 558 may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material so as to be transparent, semi-transparent, or opaque.

[0391] According to another embodiment of the present disclosure, each of the first vibration generator 550 and the second vibration generator 570 may further include a flexible cable 559 .

[0392] The flexible cable 559 is electrically connected to the pad units 558 arranged on the first vibration generator 550 and the second vibration generator 570, respectively, and can supply a vibration drive signal (or an acoustic signal) provided from the acoustic processing circuit to each of the first vibration generator 550 and the second vibration generator 570. The flexible cable 559 according to the embodiment of the present specification may include a first terminal electrically connected to a first pad electrode of the pad unit 558 and a second terminal electrically connected to a second pad electrode of the pad unit 558. For example, the flexible cable 559 may be, but is not necessarily limited to, a flexible printed circuit cable or a flexible flat cable.

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

[0394] According to embodiments herein, the flexible cable 559 may be configured to be transparent, translucent, or opaque.

[0395] In this way, each of the first vibration generator 550 and the second vibration generator 570 according to 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 vibration body without being driven independently, and can be driven as a large-area vibration body by the single vibration of the plurality of vibration generating units 550A, 550B, 550C, and 550D. This makes it possible to vibrate a wide area of ​​the display panel or to vibrate a large area by itself, thereby improving or enhancing the acoustic characteristics and sound pressure characteristics in the reproduction band and low-frequency band of the sound output from the display panel.

[0396] Figure 27 is a diagram showing a modified example of a curvature varying device in the display device according to the present specification, which is obtained by modifying the arc member and the linear drive unit shown in Figures 4 to 6, 14, and 15. Therefore, in the following description, the remaining components except for the arc member and the linear drive unit are given the same reference numerals, and the accompanying duplicated description will be omitted or simplified.

[0397] Referring to FIG. 27, in a curvature varying device 200 according to a modified example of the present specification, an arc member 210 can include a first arc member 211 and a second arc member 213.

[0398] The first arc member 211 may be disposed in a first rear area (RA1) of the display device 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 device 100. The center (or center of length) of the first arc member 211 may be adjacent to the center of the rear surface of the display device 100, and both ends (or both sides) of the first arc member 211 may be adjacent to upper corners of the left and right sides where the first short side and the second short side are connected to the first long side of the display device 100. For example, one end (or first end) of the first arc member 211 may be adjacent to an upper corner of the right side of the display device 100, and the other end (or second end) of the first arc member 211 may be adjacent to an upper corner of the left side of the display device 100.

[0399] The second arc member 213 may be disposed in a second rear area (RA2) of the display device 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 of the display device 100. The center (or center of length) of the second arc member 213 may be adjacent to the center of the rear of the display device 100, and both ends (or both sides) of the second arc member 213 may be adjacent to left and right corners of the lower part where the first short side and the second short side are connected to the second long side of the display device 100. For example, one end (or first end) of the second arc member 213 may be adjacent to a corner of the lower right side of the display device 100, and the other end (or second end) of the second arc member 213 may be adjacent to a corner of the lower left side of the display device 100.

[0400] The first arc member 211 and the second arc member 213 may be disposed on the rear surface of the display device 100 so as to be symmetrical with each other across a middle region or a vertical midline (VCL) on the rear surface of the display device 100. Here, the vertical midline (VCL) of the display device 100 may be located on the center of the short side length (or longitudinal length) of the display device 100.

[0401] The linear driving unit 223 is disposed on the support plate 221, and can rotate the rotation link unit 224 by linearly moving in response to the rotational motion of the rotation driving unit 222. The linear driving unit 223 according to an embodiment can include a first rack gear unit 223a and a second rack gear unit 223b.

[0402] The first rack gear portion 223a may include the first rack gear bar, the 1-1 rack gear, and the 1-2 rack gear (RG12) as described above. The first rack gear portion 223a is similar to the first rack gear portion 223a described above, except that the 1-2 rack gear (RG12) is formed in the middle of the first rack gear bar so as to overlap the center of the first arc member 211 at the other (or upper) end portion of the first rack gear bar, and therefore a duplicated description thereof will be omitted.

[0403] The second rack gear portion 223b may include the second rack gear bar, the 2-1 rack gear, and the 2-2 rack gear (RG22) as described above. The second rack gear portion 223b is similar to the second rack gear portion 223b described above, except that the 2-2 rack gear (RG22) is formed in the middle of the second rack gear bar so as to overlap the center of the second arc member 213 at one end (or lower end) of the second rack gear bar, and therefore a duplicated description thereof will be omitted.

[0404] The rotation link unit 224 can rotate by the linear motion of the linear drive unit 223 to rotate the arc member 210. By being rotatably fixed to the center of the arc member 210, the rotation link unit 224 can rotate by the linear motion of the linear drive unit 223 to rotate the arc member 210.

[0405] According to an embodiment, the rotation link unit 224 may include a first rotation link gear 224a and a second rotation 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 portion 223, thereby rotating the first arc member 211.

[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 portion 223, thereby rotating the second arc member 213.

[0408] As such, in the display device including the curvature variable device 200 according to the modified example of the present specification, the first arc member 211 and the second arc member 213 each have a convex curved shape toward the exact center of the rear surface of the display unit 100, thereby ensuring space in the middle area of ​​the first rear area (RA1) of the display unit 100, thereby facilitating assembly processes such as cable connection between the display unit 100 and a system board in the first rear area (RA1) of the display unit 100.

[0409] Alternatively, the curvature varying device 200 shown in Fig. 27 may be similarly applied to the curvature varying device 200 of the display device according to other examples of this specification shown in Fig. 17 to Fig. 19, and therefore a duplicated description thereof will be omitted. For example, the arc member 210, the linear driving unit 223, and the rotary link unit 224 of the curvature varying device 200 shown in Fig. 17 or Fig. 19 may be changed to the arc member 210, the linear driving unit 223, and the rotary link unit 224 of the curvature varying device 200 shown in Fig. 27, respectively.

[0410] Meanwhile, in the curvature varying device 200 according to the present specification, the respective arrangements of the first arc member 211 and the second arc member 213 of the arc member 210 are not limited to the arrangements shown in Fig. 6 and Fig. 27. As an example, the arc member 210 may include the first arc member 211 shown in Fig. 6 and the second arc member 213 shown in Fig. 27. As another example, the arc member 210 may include the first arc member 211 shown in Fig. 27 and the second arc member 213 shown in Fig. 6.

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

[0412] According to some embodiments of the present specification, a display device includes a display unit including a display panel for displaying an image and a back cover arranged on the rear of the display panel, and a curvature varying device arranged on the back cover for changing a curvature of the display unit, the curvature varying device including an arc member arranged on a rear region of the display unit parallel to a first direction, a support plate arranged on the rear region of the display unit, a rotary drive unit arranged on the support plate, a linear drive unit arranged on the support plate and moving linearly along a second direction intersecting the first direction by rotation of the rotary drive unit, a rotary link unit connected to a central portion of the arc member on the support plate and rotatingly moving by the linear movement of the linear drive unit to rotate the central portion of the arc member, and a holder unit rotatably supporting the central portion of the arc member on the support plate.

[0413] According to some embodiments of the present specification, the arc member includes a first arc member and a second arc member arranged in a first rear region and a second rear region, respectively, of the display device parallel to the first direction, and the rotation link unit may include a first rotation link gear coupled to a central portion of the first arc member on the support plate and rotated by linear motion of the linear drive unit to rotate the first arc member, and a second rotation link gear coupled to a central portion of the second arc member on the support plate and rotated by linear motion of the linear drive unit to rotate the second arc member.

[0414] According to some embodiments of the present specification, a display device includes a display unit and a curvature-variable device arranged on the rear side of the display unit to change the curvature of the display unit, and the display unit may include a display panel that displays an image, a back cover that is arranged on the rear side of the display panel and supports the curvature-variable device, and a groove portion that is concavely formed from the back cover and overlaps with the curvature-variable device to accommodate the curvature-variable device.

[0415] According to some embodiments of the present disclosure, the display device may further include an intermediate member disposed between a rear surface of the display panel overlapping the variable curvature device and the groove of the back cover.

[0416] According to some embodiments of the present specification, the curvature varying device may include an arc member arranged in a rear region of the display device parallel to a first direction, a support plate housed in a groove of the back cover, a rotary drive unit arranged on the support plate, a linear drive unit arranged on the support plate and moving linearly along a second direction intersecting the first direction by rotation of the rotary drive unit, a rotary link unit connected to a central portion of the arc member on the support plate and rotatingly moving by the linear movement of the linear drive unit to rotate the central portion of the arc member, and a holder unit rotatably supporting the central portion of the arc member on the support plate.

[0417] According to some embodiments of the present specification, the arc member includes a first arc member and a second arc member arranged in a first rear region and a second rear region, respectively, of the display device parallel to the first direction, and the rotation link unit may include a first rotation link gear coupled to a central portion of the first arc member on the support plate and rotated by linear motion of the linear drive unit to rotate the first arc member, and a second rotation link gear coupled to a central portion of the second arc member on the support plate and rotated by linear motion of the linear drive unit to rotate the second arc member.

[0418] According to some embodiments herein, the first and second arc members each have a curvilinear configuration and are counter-rotatable with respect to one another by rotation of the rotation link.

[0419] According to some embodiments of the present disclosure, each of the first arc member and the second arc member may have a curved shape, a central portion of the first arc member and a central portion of the second arc member may be disposed in a central portion of a rear region of the display device, one end of the first arc member and one end of the second arc member may be disposed in an edge portion of a first rear region of the display device, and the other end of the first arc member and the other end of the second arc member may be disposed in an edge portion of a second rear region of the display device.

[0420] According to some embodiments of the present specification, the curvature varying device further includes fixed brackets for movably supporting one end and the other end of the first arc member and one end and the other end of the second arc member, respectively, and the fixed brackets may be disposed on edge portions of the first rear surface and the second rear surface of the display device.

[0421] According to some embodiments of the present specification, the curvature variable device may further include a first fixing bracket arranged on an edge portion of a first rear surface of the display device and movably supporting one end of the first arc member, a second fixing bracket arranged on an edge portion of a second rear surface of the display device and movably supporting the other end of the first arc member, a third fixing bracket arranged on an edge portion of the first rear surface of the display device and movably supporting one end of the second arc member, and a fourth fixing bracket arranged on an edge portion of the second rear surface of the display device and movably supporting the other end of the second arc member.

[0422] According to some embodiments of the present specification, the curvature varying device further includes a guide disposed in a rear region of the display unit and movably supporting each of the first arc member and the second arc member, and the guide can movably support between one end and a center portion of the first arc member, between the other end and the center portion of the first arc member, between one end and the center portion of the second arc member, and between the other end and the center portion of the second arc member.

[0423] According to some embodiments of the present specification, the linear drive unit may include a first rack gear unit that moves linearly along the second direction due to the rotational motion of the rotation drive unit to rotate the first rotating link gear, and a second rack gear unit that moves linearly along the second direction in an opposite direction to the first rack gear unit due to the rotational motion of the rotation drive unit to rotate the second rotating link gear.

[0424] According to some embodiments of the present specification, the first rack gear unit includes a first rack gear bar arranged on a support plate so as to be slidable along the second direction, a 1-1 rack gear connected to the rotation drive unit on one side of the first rack gear bar, and a 1-2 rack connected to the first rotating link gear on the other side of the first rack gear bar, and the second rack gear unit includes a second rack gear bar arranged on the support plate so as to be slidable along the second direction, a 2-1 rack gear connected to the rotation drive unit on the other side of the second rack gear bar, and a 2-2 rack connected to the second rotating link gear on one side of the second rack gear bar.

[0425] According to some embodiments of the present disclosure, the rotary drive unit may include at least one rotary motor, a pinion gear that linearly moves the linear drive unit, and a rotary transmission unit connected between the rotary motor and the pinion gear.

[0426] According to some embodiments of the present specification, the curvature variable device further includes a fixed bracket for movably supporting one end and the other end of the first arc member and one end and the other end of the second arc member, respectively, and the fixed bracket is disposed at an edge portion of a first rear surface and an edge portion of a second rear surface of the display device, and the groove portion may include a first groove formed recessed from the back cover overlapping with the support plate and accommodating the support plate, and a second groove formed recessed from the back cover overlapping with the fixed bracket and accommodating the fixed bracket.

[0427] According to some embodiments of the present disclosure, the display device may further include a vibration device disposed on the display unit and configured to vibrate the display panel such that sound is output by vibration of the display panel.

[0428] According to some embodiments herein, the vibration device may include a bobbin and a coil wound on the bobbin, which may pass through the back cover and be coupled to the rear surface of the display panel.

[0429] According to some embodiments of the present disclosure, the vibration device may include a pair of sound generating devices coupled to the back cover for vibrating the display panel, and the back cover may include a slit disposed between the pair of sound generating devices.

[0430] According to some embodiments of the present disclosure, the vibration device may be disposed between the display panel and the back cover.

[0431] According to some embodiments of the present specification, the vibration device may include a piezoelectric vibration portion having piezoelectric characteristics, a first electrode portion arranged on a first surface of the piezoelectric vibration portion, and a second electrode portion arranged on a second surface opposite the first surface of the piezoelectric vibration portion.

[0432] According to some embodiments of the present specification, the vibration device may include a piezoelectric vibration portion having a plurality of inorganic material portions having piezoelectric properties and an organic material portion between the plurality of inorganic material portions, a first electrode portion arranged on a first surface of the piezoelectric vibration portion, and a second electrode portion arranged on a second surface opposite the first surface of the piezoelectric vibration portion.

[0433] According to some embodiments of the present specification, the display panel may include a first vibration area and a second vibration area, and the vibration device may include a first vibration generator arranged in the first vibration area of ​​the display panel having a piezoelectric vibration portion, and a second vibration generator arranged in the second vibration area of ​​the display panel having a piezoelectric vibration portion.

[0434] According to some embodiments of the present specification, the piezoelectric vibration portion of each of the first vibration generator and the second vibration generator may include a plurality of vibration generating portions, each of which may be spaced apart from one another on the same plane with a constant interval along the first direction and the second direction.

[0435] According to some embodiments of the present specification, each of the plurality of 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 a first surface of each of the plurality of inorganic material parts and the organic material part, and a second electrode part disposed on a second surface opposite to the first surface of each of the plurality of inorganic material parts and the organic material part.

[0436] According to some embodiments of the present specification, the display device may further include a vibration device disposed on the display unit and vibrating the display panel so that sound is output by vibration of the display panel, the display panel may include a first vibration area and a second vibration area separated by a groove portion and an intermediate member, and the vibration device may include a first vibration device coupled to the back cover and vibrating the first vibration area of ​​the display panel, and a second vibration device coupled to the back cover and vibrating the second vibration area of ​​the display panel.

[0437] According to some embodiments of the present disclosure, the display device may further include a rear curtain device arranged on the rear side of the display device to cover the variable curvature device, and a stand passing through the rear curtain device to support the variable curvature device.

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

[0439] The present specification described above is not limited to the above-mentioned embodiments and the attached drawings, and it will be apparent to those skilled in the art to which the present specification pertains that multiple substitutions, modifications and changes are possible within the scope of the technical matters of the present specification. Therefore, the scope of the present specification is indicated by the claims set forth below, and all modifications or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present specification. [Explanation of symbols]

[0440] 100: Display unit 110: Display panel 120: Back cover 200: Curvature variable device 210: Arc member 220, 270: Drive unit 230: Guide 240: Fixed 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 device including a display panel; a curvature varying device having a plurality of fixed brackets for movably supporting an arc member disposed in a rear region of the display device; an acoustic generating device disposed on the display panel and between the plurality of fixing brackets; a back cover disposed on a rear surface of the display panel and supporting the curvature varying device; a rear curtain device including a plurality of curtain members and disposed on a rear side of the display unit and covering the variable curvature device.

2. 2. The display device according to claim 1, wherein the rear curtain device is deformed in response to a change in curvature of the display panel when the curvature varying device is driven.

3. 10. The display device of claim 1, wherein the curtain members are spaced apart from one another in a first direction, and the curtain members are parallel to a second direction that intersects the first direction.

4. The back curtain device further includes a curtain edge frame and a curtain back frame; the curtain edge frame is coupled to a rear edge portion of the display device and includes a first opening; The display device of claim 1 , wherein the curtain back frame is coupled to the curtain edge frame and includes a second opening overlapping the first opening.

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

6. 5. The display device of claim 4, wherein the plurality of curtain members are fixed to the curtain back frame and positioned in the second opening of the curtain back frame with a constant tension.

7. 7. The display device according to claim 6, wherein each of the curtain members is inclined at a certain angle in response to a change in curvature of the display device.

8. The display device of claim 1 , wherein the curtain members include a fiber material, a fabric material, a metal material, or a metal alloy material.

9. The display device of claim 1 , further comprising a stand supporting the variable curvature device via the rear curtain device.

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

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

12. The display device according to claim 9, wherein the position adjustment device further comprises a display tilt device that tilts the display unit attached to the stand based on a user's operation.

13. The display device of claim 1 , further comprising a groove recessed from the back cover overlapping the curvature varying device to accommodate the curvature varying 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 sound generating device is A piezoelectric vibration part having piezoelectric characteristics; A first electrode portion disposed on a first surface of the piezoelectric vibration portion; a second electrode portion disposed on a second surface opposite to the first surface of the piezoelectric vibration portion; The display device of claim 1 , comprising:

16. The sound generating device is a piezoelectric vibration unit 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 portion disposed on a first surface of the piezoelectric vibration portion; a second electrode portion disposed on a second surface opposite to the first surface of the piezoelectric vibration portion; The display device of claim 1 , comprising:

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

18. The sound generating device is a first sound generating device that vibrates the first vibration area of ​​the display panel; a second sound generating device that vibrates the second vibration area of ​​the display panel; 20. The display device of claim 17, comprising:

19. The display device of claim 18 , wherein the sound generating device further comprises a groove recessed from the back cover overlapping the curvature varying device and accommodating the curvature varying device.

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

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