Display device

Abstract

A display device according to an embodiment includes a display panel, a side frame disposed on a rear side of the display panel and disposed on opposite edges of the display panel in a first direction, a length variation member disposed on the rear side of the display panel and having a length that varies in the first direction, a link connected to one edge of the length variation member, and a guide member, wherein a connection portion of the length variation member and the link is disposed on the guide member, wherein an edge of the link is connected to the side frame, and the guide member includes a curved groove and the connection portion of the length variation member and the link moves within the groove.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0055994, filed on April 29, 2021, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] Embodiments of this disclosure relate to a display device, and more specifically, to a display device that can be converted into a flat panel type or a curved panel type depending on the usage environment. Background Technology

[0004] With advancements in display-related technologies, display devices that can deform while in use are being developed. Examples of display device deformation include folding, bending, rolling (e.g., into a coiled shape), and stretching (e.g., like a rubber band). Display devices that can deform into various forms can meet the needs of display devices that have a small footprint when not in use and a larger screen size when in use. Curved display devices are an example of such deformable display devices. Summary of the Invention

[0005] Embodiments of the present invention achieve a constant curvature in a display device that can be converted into a planar or curved shape.

[0006] The display device according to an embodiment includes: a display panel; a side frame disposed on the rear side of the display panel and on opposite edges of the display panel in a first direction; a length-changing member disposed on the rear side of the display panel and having a length that varies in the first direction; a connecting rod connected to one edge of the length-changing member; and a guide member, wherein a connection portion of the length-changing member and the connecting rod is disposed on the guide member, wherein an edge of the connecting rod is connected to the side frame, and the guide member includes a curved groove, and the connection portion of the length-changing member and the connecting rod moves within the groove.

[0007] The display device may or may not be bent in the first direction depending on the length change of the length-changing component.

[0008] When the display device is bent in the first direction, the curved surface of the display device can have a constant curvature.

[0009] When the display device is bent, the radius of curvature over the entire area of ​​the display device can be constant.

[0010] When the length of the length-changing member increases in the first direction, the display device can be bent in the first direction, and when the length of the length-changing member decreases in the first direction, the display device can be unfolded in the first direction.

[0011] The trajectory of the groove formed in the guide member can have the following shape: when the connecting portion of the length-changing member and the link moves within the groove, the shape causes the display device to bend with a constant curvature.

[0012] When the display device is bent, the position P of the connecting rod at the edge of the side frame satisfies Equation 1:

[0013] [Equation 1]

[0014] P(x,y)=(Rsinθ,R(1-cosθ))

[0015] In Equation 1, R represents the radius of curvature of the display device when the display device is bent, and θ represents the angle formed by a virtual line perpendicular to the center of the display panel and a virtual line perpendicular to the endpoint of the display panel, and the reference point (0, 0) of the coordinates of P is the fixed position of the length-changing member.

[0016] The trajectory Q of the groove in the guide member can satisfy Equation 2:

[0017] [Equation 2]

[0018] Q(x, y)=P(x, y)-(Lcosβ, Lsinβ)=(Rsinθ–Lcosβ, R(1-cosθ)-Lsinβ)

[0019] In Equation 2, R represents the radius of curvature of the display device when the display device is bent, θ represents the angle formed by the virtual line perpendicular to the center of the display panel and the virtual line perpendicular to the endpoint of the display panel, L represents the length of the link, and β represents the value obtained by adding θ to the initial angle of the link when the display panel is flat, and the reference point (0, 0) of the coordinates of P is the fixed position of the length-changing member.

[0020] The strength of each of the connecting rod and the side frame can be greater than the bending strength of the display panel.

[0021] The connecting rod and the side frame may include metal.

[0022] The length-changing component can be one of a linear motor, a cylinder, or a gear coupled to a rotary motor.

[0023] The length-changing member may be a first length-changing member, and the display device may further include a second length-changing member, the length of which varies in a second direction intersecting the first direction, wherein the display device may be bent in both the first direction and the second direction.

[0024] A flange bearing having a cross-section wider than the groove of the guide member can be disposed in the groove of the guide member, and the flange bearing can be connected to the length-changing member and the connecting rod respectively.

[0025] The length-changing component can simultaneously push the opposite edges of the display panel.

[0026] The length-changing component can be provided in multiple forms in a second direction intersecting the first direction.

[0027] The length-changing member can push one of the opposite edges of the display panel.

[0028] The length-changing components can be arranged in pairs in the first direction, and one or more sets of the length-changing components can be arranged in the second direction that intersects the first direction.

[0029] A display device according to an embodiment includes: a display panel; a side frame disposed on the rear side of the display panel and on opposite edges of the display panel in a first direction; a length-varying member disposed on the rear side of the display panel and having a length that varies in a second direction intersecting the first direction; a connecting rod extending in the first direction; a connecting member connecting the connecting rod to opposite edges of the length-varying member; and a guide member having a coupling portion of the connecting rod and the connecting member disposed on the guide member, the edge of the connecting rod being connected to the side frame, the guide member including a curved groove, and the coupling portion of the connecting rod and the connecting member moving within the groove.

[0030] When the length of the length-changing member decreases in the second direction, the display device is bent in the first direction; and when the length of the length-changing member increases in the second direction, the display device is not bent (is unfolded) in the first direction.

[0031] When the display device is bent, the radius of curvature over the entire area of ​​the display device can be constant.

[0032] According to an embodiment, a display device is provided in which a constant curvature can be achieved, and the display device can be converted into a flat panel type or a curved panel type. Attached Figure Description

[0033] The above and other features of the present invention will become more apparent from the detailed description of embodiments thereof with reference to the accompanying drawings.

[0034] Figure 1 A display device according to an embodiment is shown.

[0035] Figure 2 The configuration of a curved surface display device with constant curvature according to an embodiment is shown.

[0036] Figure 3 The rear side of the display panel according to an embodiment is shown schematically.

[0037] Figure 4 Showing according to Figure 3 The side surface of the display panel in the embodiment.

[0038] Figure 5 The connection configuration of the length-changing member and the connecting rod in the guide member is shown in detail.

[0039] Figure 6 and Figure 7 The diagram illustrates the operation of the length-changing components, flange bearings, and linkages when the display panel is not bent and when it is bent.

[0040] Figure 8 The display panel, length-changing member, and linkage are schematically shown according to an embodiment.

[0041] Figure 9 Shows the state of the display panel when it changes from Figure 6 The state changed to Figure 7 The coordinates of the position of the coupling part of the connecting rod and the length-changing component, as well as the position change of the end of the connecting rod, are shown in the state.

[0042] Figure 10 This shows the location of the coupling portion when the display panel is bent to have a constant curvature.

[0043] Figures 11 to 13 The diagram shows the movement trajectory of the coupled portion of the member with varying length and the length of the connecting rod, as well as the movement trajectory of the end of the connecting rod.

[0044] Figures 14 to 22 The rear shape of the display panel according to various embodiments is shown.

[0045] Figure 23 It is along Figure 3 A cross-sectional view taken from line A-A'.

[0046] Figure 24 The curvature is shown when the display device according to the embodiment is bent.

[0047] Figure 25 and Figure 26 The embodiment of the invention demonstrates the effect of achieving constant curvature compared to experimental examples. Detailed Implementation

[0048] The invention will now be described more fully with reference to the accompanying drawings, in which embodiments of the invention are illustrated. The same reference numerals may denote the same elements throughout the specification.

[0049] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element may be directly on the other element, or an intermediary element may be present. In contrast, when an element is referred to as being "directly on" another element, no intermediary element is present. Furthermore, throughout the specification, the phrase "on" the target element will be understood to mean positioned above or below the target element, and will not necessarily be understood to mean positioned "on the upper side" based on a direction opposite to the direction of gravity. Other terms used to describe the relationship between elements should be interpreted in a similar manner.

[0050] Furthermore, unless otherwise explicitly interpreted to the contrary, the words “including” and variations such as “containing” or “comprising” shall be understood to indicate the presence of the stated element, but without excluding any other element.

[0051] Furthermore, throughout the instruction manual, the phrase "in a plane" refers to the target portion viewed from above, and the phrase "in a cross section" refers to the cross section formed by vertically cutting the target portion viewed from the side.

[0052] It will be understood that the terms “first,” “second,” “third,” etc., are used herein to distinguish one element from another, and the elements are not limited by these terms. Thus, a “first” element in one embodiment may be described as a “second” element in another embodiment.

[0053] In the following description, a display device according to an embodiment will be described with reference to the accompanying drawings.

[0054] Figure 1 A display device 100 according to an embodiment is shown. For example... Figure 1As shown, the display device 100 according to the embodiment can be a display device convertible to a flat panel display (FD) or a curved panel display (CD). That is, the display device 100 according to the embodiment can be a display device that can be converted from a flat panel display (FD) to a curved panel display (CD) or from a curved panel display (CD) to a flat panel display (FD) according to the user's needs. Figure 1 As shown, the display device 100 can be implemented as a curved display device having an edge that bends in the direction of the arrow.

[0055] When the display device 100 according to the embodiment has a curved surface, the curved surface may have a constant curvature. Figure 2 The configuration of a curved surface display device with constant curvature according to an embodiment is shown. For example... Figure 2 As shown, with constant curvature, the distance from the center CT of the curved surface to the display device 100 is R in all regions of the display device 100. When the curved display device has a constant curvature, the viewer's sense of immersion can be increased.

[0056] However, in the process of converting a flat-panel display device into a curved display device, it is not easy to bend the curved display device to have a constant curvature. To bend the display device 100, methods such as vertically pushing the edge of the display device 100 or pulling the center of the display device 100 are commonly used, but in these cases, a constant curvature cannot be achieved. This is because the bending force is not uniformly distributed throughout the entire area of ​​the display device 100.

[0057] However, as Figure 3 and Figure 4 As shown, the display device according to an embodiment includes a length-changing member MT whose length changes linearly, a guide member GM with a groove GR, and a link LB connected to the length-changing member MT in the guide member GM. As a result, a curved display device with a constant curvature can be achieved while the link LB is pushed by the length change of the length-changing member MT. Hereinafter, a configuration in which the display device according to an embodiment is bent to have a constant curvature will be described in detail.

[0058] Figure 3 The rear side of the display panel 110 according to an embodiment is shown schematically. Figure 4 Showing according to Figure 3 The side surface of the display panel 110 in one embodiment. In this embodiment, the display panel 110 can be bent in the first direction DR1. (Refer to...) Figure 3The base frame BF is disposed at the center of the rear side of the display panel 110, and the side frames SF are disposed on the rear side of the display panel 110 and on opposite edges of the display panel 110 in a first direction. The base frame BF may be disposed in a cross shape at the center of the display panel 110, and the side frames SF may be disposed linearly on the edges of the display panel 110. However, the shapes of the base frame BF and the side frames SF are not limited to these, and various modifications can be made according to embodiments of the present invention.

[0059] A length-varying member MT can be set within the base frame BF. The length-varying member MT can be fixed to the base frame BF by a fixing member FM. A guide member GM is set on one edge of the length-varying member MT. (See reference...) Figure 4 A groove GR is provided in the guide member GM, and one edge of the length-changing member MT is disposed in the groove GR of the guide member GM. The connecting portion (coupling portion) at the connection between the length-changing member MT and the connecting rod LB can be disposed on the guide member GM. The connecting portion between the length-changing member MT and the connecting rod LB can move within the groove GR of the guide member GM.

[0060] The length-changing component MT can be, for example, a linear motor, a cylinder, or a gear coupled to a rotary motor. That is, the length-changing component MT can be used without restriction as long as it is configured to allow linear movement.

[0061] In the groove GR of the guide member GM, one edge of the length-changing member MT and the connecting rod LB are connected to each other. For example... Figure 3 and Figure 4 As shown, one edge of the link LB is connected to the guide member GM, and the other edge is connected to the side frame SF.

[0062] The length of the length-changing member MT can be varied in the first direction DR1. When the length of the length-changing member MT increases due to the movement of the length-changing member MT, the length-changing member MT moves in the groove GR of the guide member GM, and the end of the display panel 110 rotates due to the pushing force of the link LB connected to one edge of the length-changing member MT.

[0063] That is, such as Figure 4As indicated by the arrows, as the length of the length-changing member MT changes, the end of the length-changing member MT moves along the trajectory of the groove GR in the guide member GM. The link LB, connected to the end (one edge) of the length-changing member MT, moves and pushes the side frame SF. With the force pushing the side frame SF, the end of the display panel 110 rotates, bending the display panel 110, thus forming the curvature of the display panel 110. The link LB can have a fixed length. The base frame BF, the side frame SF, and the link LB are formed of a material such as metal, and each can have a strength higher than the bending strength of the display panel 110. Therefore, when the length-changing member MT pushes the link LB as its length increases, the link LB pushes the side frame SF, and the display panel 110 is bent by the force pushing the side frame SF.

[0064] Figure 5 The connection between the length-changing member MT and the connecting rod LB within the guide member GM is shown in detail. A flange bearing FB, fitted into a groove GR in the guide member GM, is located at the end of the length-changing member MT. The flange bearing FB is connected to the connecting rod LB via a connecting bearing CB. That is, the length-changing member MT and the connecting rod LB are connected via the flange bearing FB.

[0065] The area outside the groove GR is wider than the groove GR itself. The flange bearing FB has a cross-section wider than the groove GR. Therefore, the flange bearing FB will not detach from the groove GR. The flange bearing FB moves within the groove GR via the movement of the length-changing member MT, and this movement is transmitted to the connecting rod LB.

[0066] Figure 6 and Figure 7 The operation of the length-changing components MT, flange bearing FB, and connecting rod LB is shown when the display panel 110 is not bent and when it is bent. Figure 6 The planar state is shown, and Figure 7 The bent state is shown. A display device having a display panel 110 that can be bent and not bent according to the length change of the length of the length-changing member MT, for example, in the first direction DR1, can be called a bendable display device.

[0067] Reference Figure 6 When the display panel 110 is in a planar state, the length of the length-changing member MT becomes the shortest, and the flange bearing FB is located in the groove GR of the guide member GM, closest to the center of the display panel 110.

[0068] Reference Figure 7The length of the length-changing member MT increases to bend the display panel 110. Therefore, the flange bearing FB is pushed to its furthest position from the center of the display panel 110 within the groove GR of the guide member GM. As the flange bearing FB is pushed, the connecting rod LB moves and connects to the side frame SF, pushing the side frame SF upwards. Thus, the display panel 110 is bent.

[0069] Figure 8 The display panel 110, the length-changing member MT, and the connecting rod LB are schematically shown according to an embodiment. Figure 8 In the following description, C represents the length of the display panel 110, and R represents the radius of curvature of the display device when it is bent. θ is the value corresponding to C / 2R, and is the angle formed by a virtual line perpendicular to the center of the display panel 110 and a virtual line perpendicular to the endpoints of the display panel 110. The reference point (0, 0) of the coordinates of P is the fixed position of the length-changing member MT. The reference point (0, 0) is, for example, Figure 8 O (origin) is shown in the diagram.

[0070] L represents the length of link LB, and β0 represents the initial state, that is, the initial predetermined angle of link LB when the display panel 110 is in a planar state. β is the value corresponding to β0+θ, and represents the angle of link LB when the display panel 110 is bent at an angle θ.

[0071] The fixed coordinates (e.g., fixed position) of the length-varying component MT are represented as A(A x A y ).

[0072] Figure 9 This shows the state of the display panel 110 from Figure 6 State change to Figure 7 The state refers to the coordinates of the changing position Q (i.e., coordinate Q(x, y)) of the coupling portion of the connecting rod LB and the length-changing member MT, and the changing position P (i.e., coordinate P(x, y)) of the end of the connecting rod LB. The connecting rod LB, length-changing member MT, display panel 110, flange bearing FB, guide member GM, and groove GR mentioned in this paragraph and subsequent descriptions can be referred to... Figure 6 and Figure 7 The display device 100 can be referred to Figure 1 Therefore, the figure number will not be indicated after the figure label in the following text.

[0073] Reference Figure 9 The position P at the end of the connecting rod LB satisfies the following equation:

[0074] [Equation 1]

[0075] P(x,y)=(Rsinθ,R(1-cosθ))

[0076] Furthermore, the position Q of the coupling portion to which the connecting rod LB and the length-changing member MT are connected (i.e., the trajectory Q of the groove GR in the guide member GM) can satisfy the following equation:

[0077] [Equation 2]

[0078] Q(x,y)=P(x,y)-(Lcosβ,Lsinβ)

[0079] =(Rsinθ–Lcosβ, R(1-cosθ)–Lsinβ)

[0080] The meanings of R, θ, and β in the equation are the same as those mentioned above. Figure 8 The descriptions have the same meaning.

[0081] like Figure 9 As shown, as the length of the length-changing component MT increases, the position Q of the coupling portion moves in the + direction of the x-axis. In this case, the position P of the end of the connecting rod LB is in the + direction of the y-axis (R). max ->R min Move on, where R max and R min This indicates the coordinate position. As the position P of the end of the link LB moves in this manner, the display panel 110 is bent to have a constant curvature.

[0082] Figure 10 The diagram shows the position Q of the coupling portion when the display panel 110 is bent to have a constant curvature. When the display panel 110 is bent, the position of the flange bearing FB moves from Q1 to Qn, forming as shown... Figure 10 The trajectory shown. Therefore, the groove GR of the guide member GM according to the embodiment can have the following characteristics. Figure 10 The trajectory shown. Figure 10 The groove GR is a track that allows the display panel 110 to have a constant curvature when it is bent.

[0083] According to an embodiment, Figure 10 The trajectory of the groove GR and Figure 9 The trajectory of the coordinate Q(x, y) is the same. That is, it can be calculated as follows: Figure 8 The bending angle θ of the display panel 110, the radius of curvature R of the display panel 110, and the length L of the connecting rod LB are used to determine the trajectory Q of the groove GR.

[0084] Q(x, y)=(Rsinθ–Lcosβ, R(1-cosθ)–Lsinβ)

[0085] Figure 11 , Figure 12 and Figure 13 The position and length of member MT, which varies in length, and the length L of link LB are shown (see reference). Figure 8 The movement trajectory of the coupling part Q (i.e., coordinate Q(x, y)) and the movement trajectory of the end position P (i.e., coordinate P(x, y)) of the link LB are compared. Figures 11 to 13 It can be determined that as the length L of the connecting rod LB increases, the torque acting on the end P of the connecting rod LB increases, allowing for driving with a smaller force and increasing the stroke. Figures 11 to 13 The diagram shows the lengths L220, L250, and L300 of the connecting rod BL and the stroke of the length-varying member MT (e.g., a linear motor). According to an embodiment, the force and stroke used for driving can be adjusted by appropriately adjusting the position of the length-varying member MT and the length of the connecting rod LB.

[0086] For example, when the length of the length-varying member MT is AQ, the value obtained by subtracting the minimum length of AQ from the maximum length of AQ can be the required stroke of the length-varying member MT.

[0087] AQ = |QA|: Linear motor length

[0088] Max(AQ)–Min(AQ): Required stroke for the linear motor

[0089] The above text describes, for example, Figure 3 The embodiment shown has two length-changing members MT that push the display panel 110 from two edges on the first direction DR1, but the shape of the length-changing members MT (e.g., a linear motor) can be changed. Figures 14 to 22 The rear shape of the display panel 110 according to various embodiments is shown.

[0090] Reference Figure 14 The display device according to an embodiment may include a length-variable member MT. Figure 3 In the middle, two length-changing components MT push the display panel 110 from the left and right respectively, but in Figure 14 In this embodiment, as the length of a length-changing member MT increases to both sides, the display panel 110 can be rolled out simultaneously. This simplifies the manufacturing process. Descriptions and references to other constituent elements are also provided. Figure 3 The elements described are the same, and therefore, detailed descriptions of the same or similar constituent elements will be omitted.

[0091] In addition to the formation direction of the length-varying component MT Figure 15 Implementation examples and Figure 14 The embodiments are the same. Detailed descriptions of identical or similar constituent elements will be omitted. Figure 15In this configuration, a length-changing member MT is positioned on the second direction DR2. Since the display panel 110 is bent in the first direction DR1, the direction in which the display panel 110 is bent is perpendicular to the direction in which the length-changing member MT is positioned. The length-changing member MT is connected to the connecting rod LB via a connecting member CM. The entire length of the connecting member CM can be fixed. Therefore, when the length of the length-changing member MT increases in the second direction DR2, the length of the connecting member CM decreases in the first direction DR1, and the display panel 110 unfolds. Conversely, when the length of the length-changing member MT decreases in the second direction DR2, the length of the connecting member CM increases in the first direction DR1, and the display panel 110 is bent as the connecting member CM pushes the connecting rod LB. That is, in... Figure 15 In the case of the embodiments, with Figure 14 In contrast to the embodiment, when the length-changing member MT decreases, the display panel 110 is bent, and when the length of the length-changing member MT increases, the display panel 110 is unfolded.

[0092] Figure 16 The illustration shows a parallel with another embodiment. Figure 14 The area shown is the same area. Except for the two parallel length-varying members MT. Figure 16 Implementation examples and Figure 14 The embodiments are the same. Identical or similar constituent elements will not be described. Figure 16 In this embodiment, the display panel 110 is bent more by two parallel length-changing members MT. Therefore, the display panel 110 has a stronger bending force and can be bent very well.

[0093] exist Figure 16 The image shows two parallel length-changing members MT, but a length-changing member MT can be two separate members, such as... Figure 3 The length-changing member MT is shown. That is, as... Figure 17 As shown, the display panel 110 can be bent by four separate length-varying members MT. Detailed descriptions of the same or similar constituent elements will be omitted.

[0094] Figure 18 The illustration shows a parallel with another embodiment. Figure 14 The area shown is the same area. Except for the three parallel length-varying members MT. Figure 18 Implementation examples and Figure 14 The embodiments are the same. Detailed descriptions of identical or similar constituent elements will be omitted. Figure 18 In this embodiment, the display panel 110 is bent by three parallel length-changing members MT. Therefore, the display panel 110 has a stronger bending force and can be bent very well.

[0095] exist Figure 18 The diagram shows three parallel length-changing members MT, but a length-changing member can be six separate members, such as... Figure 3 The length-changing member MT is shown. That is, as... Figure 19 As shown, the display panel 110 can be bent by six separate length-varying members MT.

[0096] Figure 20 The illustration shows a parallel with another embodiment. Figure 14 The area shown is the same area. (Refer to...) Figure 20 According to an embodiment, the display panel 110 includes a first length-changing member MT1 disposed on a first direction DR1 and a second length-changing member MT2 disposed on a second direction DR2. The first length-changing member MT1 can bend the display panel 110 in the first direction DR1, and the second length-changing member MT2 can bend the display panel 110 in the second direction DR2. That is, according to... Figure 20 The display panel 110 of the display device in the embodiment can be bent in both the first direction DR1 and the second direction DR2 (for example, it can be bendable).

[0097] exist Figure 20 The diagram shows two length-changing members MT1 and MT2 (e.g., linear motors) disposed in a first direction DR1 and a second direction DR2, but may include four length-changing members (e.g., linear motors) separated in each direction. Figure 21 As shown, the display panel 110 may include four separate length-changing members MT, and the display panel 110 can be bent in the up, down, left, and right directions via each length-changing member MT. In addition to providing length-changing members MT at each bending section, Figure 21 Implementation examples and Figure 20 The embodiments are the same, and therefore detailed descriptions of the same or similar constituent elements will be omitted.

[0098] Figure 22 The illustration shows a parallel with another embodiment. Figure 20 The area shown is the same area. (Refer to...) Figure 22 Except that the display device includes a length-changing member MT disposed on the second direction DR2 and does not include a length-changing member MT disposed on the first direction DR1, the display device according to the embodiment is similar to... Figure 20 The display device is the same. Detailed descriptions of identical or similar components will be omitted. Figure 22 In one embodiment, the display panel 110 may not be bent in the first direction DR1, but may be bent in the second direction DR2.

[0099] Figure 23 It is along Figure 3 The cross-sectional view taken by line A-A'. (Refer to...) Figure 23 According to an embodiment, the side frame SF of the display device may have a thickness that decreases towards the edge of the display panel 110. The cover CV may cover both the side surface and the rear surface of the side frame SF while covering the side edge of the display panel 110. Figure 23 As shown, in the case of the display device according to the embodiment, apart from the side frame SF, no separate structure for folding is provided on the edge of the display panel 110. Therefore, the edge of the display device does not become thick.

[0100] As described above, the display device according to the embodiment is bent by the linear movement of the length-changing member MT and the connecting rod LB connected to the length-changing member MT. Therefore, the display device can be bent without increasing its thickness, and the display device can be bent to have a constant curvature. This is because the groove GR of the guide member GM at the junction of the length-changing member MT and the connecting rod LB has a trajectory from which a constant curvature is derived.

[0101] Figure 24 The curvature is shown when the display device according to the embodiment is bent. (Refer to...) Figure 24 The display device according to the embodiment is bent at a constant curvature.

[0102] Figure 25 and Figure 26 The embodiment of the invention demonstrates the effect of achieving constant curvature compared to experimental examples. Figure 25 and Figure 26 The diagram illustrates the curvature during bending and the curvature relative to the position from the center, based on various experimental examples and embodiments of the invention.

[0103] Table 1 shows experimental examples and bending methods of embodiments of the present invention.

[0104] Table 1

[0105] Experimental Example 1 The deformation of the back panel caused the display panel to be pushed. Experimental Example 2 Push the display panel vertically from its end. Experimental Example 3 Pull the center part of the display panel Experiment Example 4 Push the end of the display panel from the center. Example 1 The linkage is pushed by the movement of the component with changing length.

[0106] Reference Figure 25 In Example 1, constant curvature was achieved, but in Experimental Examples 1 through 4, it was determined that constant curvature was not achieved. Similarly, refer to... Figure 26 In Example 1, the curvature is constant and independent of the position from the center, but in Experimental Examples 1 to 4, the curvature is determined to vary depending on the position.

[0107] Although the invention has been specifically shown and described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes in form and detail may be made in the invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A display device, wherein, The display device includes: Display panel; A side frame is disposed on the rear side of the display panel and on the opposite edge of the display panel in a first direction; A length-changing member is disposed on the rear side of the display panel and has a length that varies in the first direction; A connecting rod, attached to one edge of the length-changing member; and Guide components, The connection portion between the length-changing component and the connecting rod is disposed on the guide component. The edge of the connecting rod is connected to the side frame, and The guide member includes a curved groove, and the length-changing member moves within the groove at the connection portion of the link.

2. The display device according to claim 1, wherein, The display device is bendable in the first direction according to the length change of the length-changing component.

3. The display device according to claim 2, wherein, When the display device is bent in the first direction, the curved surface of the display device has a constant curvature.

4. The display device according to claim 2, wherein, When the display device is bent, the radius of curvature of the display device is constant throughout the entire area.

5. The display device according to claim 2, wherein, When the length of the length-changing member increases in the first direction, the display device is bent in the first direction, and When the length of the length-changing member decreases in the first direction, the display device is unfolded in the first direction.

6. The display device according to claim 1, wherein, The trajectory of the groove formed in the guide member has the following shape: when the connecting portion of the length-changing member and the connecting rod moves within the groove, the shape causes the display device to bend with a constant curvature.

7. The display device according to claim 1, wherein, When the display device is bent, the position P of the connecting rod at the edge of the side frame satisfies: P(x,y)=(Rsinθ,R(1-cosθ)) Where R represents the radius of curvature of the display device when it is bent, and θ represents the angle formed by a virtual line perpendicular to the center of the display panel and a virtual line perpendicular to the endpoints of the display panel. The reference point for the coordinates of P is the fixed position of the length-changing component.

8. The display device according to claim 7, wherein, The trajectory Q of the groove in the guide member satisfies: Q(x, y)=P(x, y)-(Lcosβ, Lsinβ)=(Rsinθ–Lcosβ, R(1-cosθ)-Lsinβ) in, L represents the length of the connecting rod, and β represents the value obtained by adding θ to the initial angle of the link when the display panel is flat.

9. The display device according to claim 1, wherein, The strength of each of the connecting rod and the side frame is greater than the bending strength of the display panel.

10. The display device according to claim 9, wherein, The connecting rod and the side frame are made of metal.

11. The display device according to claim 1, wherein, The length-changing component is one of a linear motor, a cylinder, and a gear coupled to a rotary motor.

12. The display device according to claim 1, wherein, The length-changing component is a first length-changing component, and the display device further includes: The second length-varying member has a length that varies in a second direction intersecting the first direction. The display device is bendable in both the first and second directions.

13. The display device according to claim 1, wherein, The display device further includes: A flange bearing is disposed in the groove of the guide member and has a cross-section wider than the groove of the guide member. The flange bearing is connected to the length-changing component and the connecting rod, respectively.

14. The display device according to claim 1, wherein, The length-changing member simultaneously pushes the opposite edges of the display panel.

15. The display device according to claim 14, wherein, The length-changing components are provided in multiple forms in a second direction that intersects the first direction.

16. The display device according to claim 1, wherein, The length-changing member pushes one of the opposite edges of the display panel.

17. The display device according to claim 15, wherein, The length-changing components are arranged in pairs in the first direction, and One or more sets of the length-changing components are arranged in the second direction, which intersects the first direction.

18. A display device, wherein, The display device includes: Display panel; A side frame is disposed on the rear side of the display panel and on the opposite edge of the display panel in a first direction; A length-varying member is disposed on the rear side of the display panel and has a length that varies in a second direction intersecting the first direction; The connecting rod extends in the first direction; A connecting member that connects the link to the opposite edges of the length-changing member; and Guide components, The coupling portion between the connecting rod and the connecting member is disposed on the guide member. The edge of the link is connected to the side frame, and The guide member includes a curved groove, and the coupling portion of the connecting rod and the connecting member moves within the groove.

19. The display device according to claim 18, wherein, When the length of the length-changing member decreases in the second direction, the display device is bent in the first direction, and When the length of the length-changing member increases in the second direction, the display device is unfolded in the first direction.

20. The display device according to claim 19, wherein, When the display device is bent, the radius of curvature of the display device is constant throughout the entire area.

Images