Cover plate and display device

Abstract

Disclosed in the embodiments of the present application are a cover plate and a display device. The cover plate is configured to be attached to a display panel, and comprises a first portion, wherein the first portion is configured to cover at least part of a front face of a bending portion, and the face of the first portion facing the display panel is a first curved surface; and in a first direction, the curvature radius of any point on the first curved surface is greater than or equal to 300 mm, the first curved surface covers at least the middle region of the bending portion, and the first direction is the long-axis direction of the bending portion.

Description

Cover and display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a cover plate and a display device. Background Art

[0002] In a display module, the binding portion of the display panel needs to bend to the back of the display panel via a folding portion. At this point, the folding portion is subject to bending stress in the vertical bending direction. Furthermore, after a fully curved cover is assembled onto the display panel, the folding portion of the display panel is affected by the shape of the fully curved cover, causing it to bend along the curved direction of the fully curved cover. The bending stress in the two directions is perpendicular to each other, causing the top of the fold (the elliptical circle) to tilt toward the cover panel CG side (as shown in Figure 1). Because the area with the smaller radius of curvature of the fully curved cover corresponds to the folding portion, the bending radius at the top of the fold is locally reduced, increasing the stress, which can lead to wiring breakage at the top of the fold. SUMMARY OF THE INVENTION

[0003] Embodiments of the present application provide a cover plate and a display device, which can reduce the risk of wire breakage in a bending area of ​​a display panel.

[0004] An embodiment of the present application provides a cover plate for attaching to a display panel, wherein the display panel includes a display body, a bent portion, and a binding portion, wherein the binding portion is disposed on the back side of the display body through the bent portion;

[0005] The cover plate includes a first part, which is used to cover at least part of the bent portion on the front side. The side of the first part facing the display panel is a first curved surface, wherein in the first direction, the curvature radius of any point on the first curved surface is greater than or equal to 300 mm, and the first curved surface covers at least the middle area of ​​the bent portion. The first direction is the long axis direction of the bent portion.

[0006] Optionally, in some embodiments of the present application, in the first direction, the curvature radii of the first curved surface are equal, and the first portion is used to fully cover the bent portion.

[0007] Optionally, in some embodiments of the present application, the cover plate further includes a second portion, wherein in the first direction, the second portion is connected to a side opposite to the first portion, and a side of the second portion facing the display panel is a second curved surface, and the second curved surface is connected to the first curved surface, wherein in the first direction, a maximum curvature radius of the second curved surface is less than or equal to a curvature radius of the first curved surface;

[0008] The curvature radius of the second curved surface decreases gradually from a side of the second portion connected to the first portion toward a side of the second portion away from the first portion.

[0009] Optionally, in some embodiments of the present application, the radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 3 mm.

[0010] Optionally, in some embodiments of the present application, the cover plate further includes a second portion, wherein in the first direction, the first curved surface has an equal curvature radius, and the second portion is connected to an opposite side of the first portion, and the first portion and the second portion as a whole completely cover the bent portion, and a surface of the second portion facing the display panel is a second curved surface, and the second curved surface is connected to the first curved surface, wherein in the first direction, the maximum curvature radius of the second curved surface is less than or equal to the curvature radius of the first curved surface;

[0011] The curvature radius of the second curved surface decreases from the side of the second portion connected to the first portion to the side of the second portion away from the first portion;

[0012] In a two-dimensional coordinate system, the length of the second curved surface in the first direction is taken as the X-axis, the curvature radius of the second curved surface is taken as the Y-axis, the endpoint of the maximum curvature radius of the second curved surface is set as the first endpoint (0, a), a>0, the endpoint of the minimum curvature radius of the second curved surface is set as the second endpoint (b, c), b is the total length of the second curved surface in the first direction, c>0, and the line connecting the first endpoint and the second endpoint is a straight line;

[0013] In the coordinate system corresponding to all the curvature radii of the second surface, except for the coordinates corresponding to the maximum curvature radius and the minimum curvature radius of the second surface, the coordinates corresponding to other curvature radii of the second surface are all located on the side of the straight line away from the origin (0, 0).

[0014] Optionally, in some embodiments of the present application, the coordinates corresponding to all the curvature radii of the second curved surface are connected to form a curvature line, and the curvature line is a parabola.

[0015] Optionally, in some embodiments of the present application, in the first direction, the length of the first part is greater than the length of the second part.

[0016] Optionally, in some embodiments of the present application, the radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 50 mm.

[0017] Optionally, in some embodiments of the present application, the cover plate further includes a third portion, the third portion being connected to a side of the second portion away from the first portion, the side of the third portion facing the display panel being a third curved surface, the third curved surface being connected to the second curved surface, wherein in the first direction, a maximum radius of curvature of the third curved surface is less than or equal to a radius of curvature of the second curved surface;

[0018] The curvature radius of the third curved surface decreases gradually from a side of the third portion connected to the second portion toward a side of the third portion away from the second portion.

[0019] Optionally, in some embodiments of the present application, the minimum curvature radius of the third curved surface is greater than or equal to 3 mm.

[0020] Optionally, in some embodiments of the present application, in the first direction, the curvature radius of the first curved surface is gradually changing.

[0021] Optionally, in some embodiments of the present application, the curvature radius of the first curved surface gradually increases from the two side edges of the first curved surface toward the central axis of the first curved surface.

[0022] Accordingly, an embodiment of the present application further provides a display device, comprising:

[0023] A display panel, the display panel comprising a display body, a bending portion, and a binding portion, wherein the binding portion is disposed on the back of the display body through the bending portion;

[0024] The cover plate as described in any one of the above embodiments is attached to the display side of the display panel by optical adhesive.

[0025] For example, the cover plate includes a first part, the front side of the first part covers at least part of the bent portion, and the side of the first part facing the display panel is a first curved surface, wherein in the first direction, the radius of curvature of any point on the first curved surface is greater than or equal to 300 mm, and the first curved surface covers at least the middle area of ​​the bent portion, and the first direction is the long axis direction of the bent portion.

[0026] Optionally, in some embodiments of the present application, in the first direction, the curvature radii of the first curved surface are equal, and the first portion is used to fully cover the bent portion.

[0027] Optionally, in some embodiments of the present application, the cover plate further includes a second portion, wherein in the first direction, the second portion is connected to a side opposite to the first portion, and a side of the second portion facing the display panel is a second curved surface, and the second curved surface is connected to the first curved surface, wherein in the first direction, a maximum curvature radius of the second curved surface is less than or equal to a curvature radius of the first curved surface;

[0028] The curvature radius of the second curved surface decreases gradually from a side of the second portion connected to the first portion toward a side of the second portion away from the first portion.

[0029] Optionally, in some embodiments of the present application, the radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 3 mm.

[0030] Optionally, in some embodiments of the present application, the cover plate further includes a second portion, wherein in the first direction, the first curved surface has an equal curvature radius, and the second portion is connected to an opposite side of the first portion, and the first portion and the second portion as a whole completely cover the bent portion, and a surface of the second portion facing the display panel is a second curved surface, and the second curved surface is connected to the first curved surface, wherein in the first direction, the maximum curvature radius of the second curved surface is less than or equal to the curvature radius of the first curved surface;

[0031] The curvature radius of the second curved surface decreases from the side of the second portion connected to the first portion to the side of the second portion away from the first portion;

[0032] In a two-dimensional coordinate system, the length of the second curved surface in the first direction is taken as the X-axis, the curvature radius of the second curved surface is taken as the Y-axis, the endpoint of the maximum curvature radius of the second curved surface is set as the first endpoint (0, a), a>0, the endpoint of the minimum curvature radius of the second curved surface is set as the second endpoint (b, c), b is the total length of the second curved surface in the first direction, c>0, and the line connecting the first endpoint and the second endpoint is a straight line;

[0033] In the coordinate system corresponding to all the curvature radii of the second surface, except for the coordinates corresponding to the maximum curvature radius and the minimum curvature radius of the second surface, the coordinates corresponding to other curvature radii of the second surface are all located on the side of the straight line away from the origin (0, 0).

[0034] Optionally, in some embodiments of the present application, the coordinates corresponding to all the curvature radii of the second curved surface are connected to form a curvature line, and the curvature line is a parabola.

[0035] Optionally, in some embodiments of the present application, in the first direction, the length of the first part is greater than the length of the second part.

[0036] Optionally, in some embodiments of the present application, the radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 50 mm.

[0037] Optionally, in some embodiments of the present application, the cover plate further includes a third portion, the third portion being connected to a side of the second portion away from the first portion, the side of the third portion facing the display panel being a third curved surface, the third curved surface being connected to the second curved surface, wherein in the first direction, a maximum radius of curvature of the third curved surface is less than or equal to a radius of curvature of the second curved surface;

[0038] The curvature radius of the third curved surface decreases gradually from a side of the third portion connected to the second portion toward a side of the third portion away from the second portion.

[0039] Optionally, in some embodiments of the present application, the minimum curvature radius of the third curved surface is greater than or equal to 3 mm.

[0040] Optionally, in some embodiments of the present application, in the first direction, the curvature radius of the first curved surface is gradually changing.

[0041] Optionally, in some embodiments of the present application, the curvature radius of the first curved surface gradually increases from the two side edges of the first curved surface toward the central axis of the first curved surface. Beneficial effects

[0042] The cover plate of the embodiment of the present application is used to be attached to a display panel, which includes a display body, a bending portion and a binding portion, and the binding portion is arranged on the back of the display body through the bending portion; the cover plate includes a first part, the first part is used to cover at least part of the bending portion on the front side, and the side of the first part facing the display panel is a first curved surface, wherein in the first direction, the curvature radius of any point on the first curved surface is greater than or equal to 300 mm, and the first curved surface covers at least the middle area of ​​the bending portion, and the first direction is the long axis direction of the bending portion.

[0043] The cover plate of this embodiment uses the first part with a large curvature radius to cover the bent portion on the front side, which reduces the bending stress of the cover plate corresponding to the bent portion, thereby reducing the risk of wiring breakage in the bent portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG1 is a diagram of a display module provided in the related art;

[0045] FIG2 is a bottom view schematic diagram of the display device provided in an embodiment of the present application;

[0046] FIG3 is a schematic cross-sectional view of the structure along line AA in FIG2 ;

[0047] FIG4 is an enlarged view of portion C1 in FIG3 ;

[0048] FIG5 is a schematic cross-sectional view of the structure along line BB in FIG2 ;

[0049] FIG6 is an enlarged view of portion C2 in FIG5 ;

[0050] FIG7 is a schematic cross-sectional view of the structure along line CC in FIG2 ;

[0051] FIG8 is a bottom view of the cover plate of the display device provided in an embodiment of the present application;

[0052] FIG9 is a schematic diagram of a three-dimensional structure from a first viewing angle of a cover plate of a display device provided in an embodiment of the present application;

[0053] FIG10 is a schematic diagram of the third perspective structure of the cover plate of the display device provided by an embodiment of the present application from a second perspective;

[0054] FIG11 is a bottom view schematic diagram of another display device provided in an embodiment of the present application;

[0055] FIG12 is a schematic cross-sectional view of FIG11 along line CC;

[0056] FIG13 is a curvature line diagram of a second curved surface in another display device provided in an embodiment of the present application;

[0057] Figure 14-1 is a simulation experiment diagram of Comparative Example 1;

[0058] Figure 14-2 is a simulation experiment diagram of Comparative Example 2;

[0059] FIG15 is a schematic structural diagram of a cover plate of another display device provided in an embodiment of the present application;

[0060] FIG16 is a schematic structural diagram of another display device provided in an embodiment of the present application.

[0061] In FIG. 1 , BP1 and BP2 are backplanes supporting the display panel. Modes for Carrying Out the Invention

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device; the terms "first", "second", "third", etc. are used only as labels and do not impose numerical requirements or establish an order.

[0063] The embodiments of the present application provide a cover plate and a display device, which are described in detail below. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments.

[0064] The cover plate of the embodiment of the present application is used to be attached to a display panel, which includes a display body, a bending portion and a binding portion, and the binding portion is arranged on the back of the display body through the bending portion; the cover plate includes a first part, the first part is used to cover at least part of the bending portion on the front side, and the side of the first part facing the display panel is a first curved surface, wherein in the first direction, the curvature radius of any point on the first curved surface is greater than or equal to 300 mm, and the first curved surface covers at least the middle area of ​​the bending portion, and the first direction is the long axis direction of the bending portion.

[0065] The cover plate of this embodiment uses the first part with a large curvature radius to cover the bent portion on the front side, which reduces the bending stress of the cover plate corresponding to the bent portion, thereby reducing the risk of wiring breakage in the bent portion.

[0066] The following is a detailed description of the embodiments of the present application.

[0067] 2 to 7 , an embodiment of the present application provides a display device 100 , which includes a display panel 10 and a cover plate 20 .

[0068] The display panel 10 includes a display body 10a, a bent portion 10b, and a binding portion 10c. The binding portion 10c is disposed on the back of the display body 10a through the bent portion 10b. The cover 20 is attached to the display side of the display panel 10 by optical adhesive 31.

[0069] Optionally, in a film layer stacking structure, the display panel 10 includes a first backplane 11 , a second backplane 12 , and a display device layer 13 . The display device 100 may further include a polarizer 32 , a protective layer 33 , and a heat dissipation stack 34 .

[0070] The display device layer 13 corresponding to the display body 10a is arranged on the first back plate 11, the display device layer 13 corresponding to the binding portion 10c is arranged on the second back plate 12, and the display device layer 13 corresponding to the bending portion 10b is bent.

[0071] The polarizer 32 is disposed on the display device layer 13, and the optical adhesive 31 is disposed on the polarizer 32. The second back plate 12 is located on a side of the first back plate 11 away from the cover plate 20.

[0072] The heat dissipation laminate 34 is adhered between the first back plate 11 and the second back plate 12 via an adhesive layer 35. The heat dissipation laminate 34 includes a heat dissipation layer 341, a base layer 342, and a buffer layer 343 stacked in sequence.

[0073] The protection layer 33 covers the bent portion 10 b and extends to cover the display body 10 a and the binding portion 10 c.

[0074] Optionally, the display device layer 13 is an organic light emitting display layer (OLED), a quantum dot light emitting display layer (QLED) or a micro inorganic light emitting display layer (u-LED).

[0075] In some embodiments, the polarizer 32 may be replaced by a color filter layer integrated into the display device layer 13 .

[0076] With reference to Figures 7-9 , the cover plate 20 includes a first portion 21, the front of which covers at least a portion of the bent portion 10b. The surface of the first portion 21 facing the display panel 10 is a first curved surface q1. The radius of curvature of the first curved surface q1 is constant along a first direction x. The radius of curvature of the first curved surface q1 is greater than or equal to 300 mm. The first curved surface q1 covers at least the central region of the bent portion 10b. The first direction x is the long axis of the bent portion 10b.

[0077] The cover plate 20 of the display device 100 of this embodiment uses the first portion 21 with a large curvature radius to cover the bent portion 10b from the front, reducing the bending stress of the bent portion 10b corresponding to the cover plate 20, thereby reducing the risk of wiring breakage in the bent portion 10b.

[0078] Optionally, the radius of curvature of the first curved surface q1 can be 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 550 mm, 600 mm, 650 mm, 700 mm, 750 mm, 800 mm, 850 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, 1100 mm, 1150 mm, 1200 mm, 1250 mm, 1300 mm, 1350 mm, 1400 mm, 1450 mm, 1500 mm, 1550 mm, 1600 mm, 1650 mm, 1700 mm, 1750 mm, 1800 mm, 1850 mm, 1900 mm, 1950 mm or 2000 mm, etc.

[0079] It is understandable that the larger the curvature radius of the first portion 21 of the cover plate 20 is, the smaller its influence on the bending stress of the bent portion 10 b is, and the less likely the wiring of the bent portion 10 b is to break.

[0080] Therefore, the first portion with a curvature radius greater than or equal to 300 mm corresponds to at least the middle area of ​​the bending portion 10b, thereby reducing the bending stress on the bending portion 10b and thereby reducing the risk of wiring breakage in the bending portion 10b.

[0081] Optionally, in this embodiment, the first portion 21 fully covers the bend portion 10b. This embodiment uses the first portion 21 with a large curvature radius to fully cover the bend portion 10b, which can minimize the impact of the first portion 21 on the bending stress of the bend portion 10b, thereby maximally protecting the wiring within the bend portion 10b.

[0082] The first portion 21 extends to cover a portion of the display body 10 a , that is, the first curved surface q1 of the first portion 21 also extends to cover a portion of the display body 10 a .

[0083] Optionally, the cover plate 20 may further include a second portion 22 connected to the opposite side of the first portion 21 in the first direction x. The side of the second portion 22 facing the display panel 10 is a second curved surface q2. The second curved surface q2 is connected to the first curved surface q1. The radius of curvature of the second curved surface q2 decreases from the side where the second portion 22 connects to the first portion 21 toward the side where the second portion 22 is away from the first portion 21.

[0084] In the first direction x, the maximum curvature radius of the second curved surface q2 is less than or equal to the curvature radius of the first curved surface q1.

[0085] In this embodiment, the second portion 22 with decreasing curvature radius is located on the opposite side of the first portion 21, so that the side of the cover plate 20 is narrowed and adapted to the user's hand holding the display device, making the user's grip more comfortable.

[0086] Optionally, the radius of curvature of the first curved surface q1 is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface q2 is greater than or equal to 3 mm.

[0087] For example, the minimum radius of curvature of the second surface q2 can be 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm or 200 mm.

[0088] It is understandable that when the curvature radius of the first curved surface q1 is greater than 1500 mm, for a small-sized display device 100, the display surface of the display device 100 is almost equivalent to a plane, and the effect of a curved screen cannot be achieved. Therefore, the curvature radius of the first curved surface is selected to be less than or equal to 1500 mm to achieve a curved screen.

[0089] Because the edge area of ​​the display device 100 is in a narrow, contracted state, if the minimum curvature radius of the second curved surface q2 is too small, a longer transition is required, which is not conducive to a narrow edge. Furthermore, a curvature radius that is too small does not conform to the palm, resulting in a poor grip. Therefore, the minimum curvature radius of the second curved surface q2 is selected to be greater than or equal to 3 mm to ensure that the edge area of ​​the display device 100 meets the narrow edge requirement and improve the user's grip experience.

[0090] The maximum curvature radius of the second curved surface q2 is smaller than or equal to the curvature radius of the first curved surface q1, so that the first curved surface q1 can transition to the second curved surface q2 more smoothly and quickly, reducing the abruptness of the transition.

[0091] In some embodiments, in the first direction x, the curvature radius of the second curved surface q2 may also be the same, and the curvature radius of the second curved surface q2 is smaller than the curvature radius of the first curved surface q1.

[0092] Please refer to Figure 10. Optionally, the cover 20 also includes an appearance curved surface wg facing the user. The appearance curved surface wg includes a first appearance curved surface g1 of the first part 21 and a second appearance curved surface g2 of the second part 22. The first appearance curved surface g1 and the first curved surface q1 are arranged opposite to each other, and the second appearance curved surface g2 and the second curved surface q2 are arranged opposite to each other.

[0093] In the first direction x, the second curved surface g2 is connected to the opposite side of the first curved surface g1. In the first direction x, the radius of curvature of the first curved surface g1 is equal to the radius of curvature of the first curved surface q1 it overlaps with, and the radius of curvature of the second curved surface g2 is the same as the radius of curvature of the second curved surface q2 it overlaps with.

[0094] Optionally, the appearance curved surface wg further includes an annular surface gh, which is connected to the outer periphery of the whole formed by the first appearance curved surface g1 and the second appearance curved surface g2. The annular surface gh is a chamfered arc surface.

[0095] The annular surface gh extends beyond the four edges of the display panel 10. The annular surface gh on the long side faces and overlaps with the second curved surface q2, and the annular surface gh on the short side faces and overlaps with the first curved surface q1.

[0096] Using the chamfered arc surface as the annular surface gh makes the sides of the display device 100 smoother, thereby improving the grip and appearance.

[0097] 11 and 12 , the cover plate 20 of the display device 100 of another embodiment of the present application differs from the above embodiment in that the structure of the cover plate 20 is different. Specifically:

[0098] The cover plate 20 also includes a second portion 22, which is connected to the opposite side of the first portion 21 in the first direction x. The first and second portions 21, 22, as a whole, fully cover the bent portion 10b. The side of the second portion 22 facing the display panel 10 is a second curved surface q2, which is connected to the first curved surface q1. The radius of curvature of the second curved surface q2 decreases from the side where the second portion 22 connects to the first portion 21 toward the side of the second portion 22 away from the first portion 21.

[0099] In the first direction x, the maximum curvature radius of the second curved surface q2 is less than or equal to the curvature radius of the first curved surface q1.

[0100] In order to further narrow the frame width and achieve a smoother transition, a second portion 22 with a gradually changing curvature radius is used to cover the side area of ​​the bent portion 10b.

[0101] As shown in Figure 13, in a two-dimensional coordinate system, the length of the second curved surface q2 in the first direction x is the X-axis, and the radius of curvature of the second curved surface q2 is the Y-axis. The endpoint of the maximum radius of curvature of the second curved surface q2 is set to the first endpoint K1(0, a), where a>0, and the maximum radius of curvature of the second curved surface q2 is equal to the radius of curvature of the first curved surface q1. The endpoint of the minimum radius of curvature of the second curved surface q2 is set to the second endpoint K2(b, c), where b is the total length of the second curved surface q2 in the first direction x, and c>0. The line connecting the first endpoint K1 and the second endpoint K2 is a straight line L. The origin (0, 0) can be located on the intersection axis of the first curved surface q1 and the second curved surface q2.

[0102] Among them, in the coordinate system corresponding to all the curvature radii of the second surface q2, except for the coordinates corresponding to the maximum curvature radius and the minimum curvature radius of the second surface q2, the coordinates corresponding to other curvature radii of the second surface q2 are all located on the side of the straight line L away from the origin (0, 0).

[0103] In this embodiment, except for the coordinates corresponding to the maximum and minimum curvature radii of the second surface q2, the coordinates corresponding to other curvature radii of the second surface q2 are all located on the side of the straight line L away from the origin (0,0), thereby avoiding a sharp drop in the curvature radius of the second surface q2, thereby avoiding a sudden and sharp increase in the stress effect on the bending portion 10b, and greatly reducing the risk of wiring breakage in the bending portion 10b.

[0104] It should also be noted that the third endpoint K3 is set to have a value b corresponding to the X-axis and a value a corresponding to the Y-axis. In other words, the line connecting the first endpoint K1 and the third endpoint K3 is a line of constant curvature with the maximum curvature radius of the second curved surface q2 as its curvature radius.

[0105] According to the first endpoint K1 (0, a) and the second endpoint K2 (b, c), it can be seen that the straight line L is Y L =[(ca) / b] X1+a, then when X1 is the same, the curvature radius of the endpoint between the first endpoint k1 and the second endpoint k2 in the second surface q2 is greater than Y L .

[0106] For example, if X1 is b / 2, then Y L = (c + a) / 2. Then the curvature radius of the center V1 of the second curved surface q2 is greater than half of the sum of the maximum curvature radius and the minimum curvature radius of the second curved surface q2.

[0107] In a rectangle with origin O, first endpoint K1, second endpoint K2, and third endpoint K3 as vertices, the closer the area (gray area) enclosed by the curvature line Q of the second curved surface q2, the line Y=c, and the Y-axis to the area of ​​the rectangle (the area enclosed by the equal curvature lines K1, K3, the line Y=c, and the line X=b), the lower the risk of breakage in the bent portion 10b. The parameter corresponding to the Y-axis for the curvature line Q is the radius of curvature.

[0108] For example, in the simulation experiment, assuming comparative example 1, when the curvature radius of the first curved surface q1 is 600 mm and the curvature radius of the second curved surface q2 is 200 mm, the stress condition and the upward warping amount of the bent portion 10b are shown in FIG14-1.

[0109] Assuming comparative example 2, when the curvature radius of the first curved surface q1 is 600 mm and the curvature radius of the second curved surface q2 is 500 mm, the stress condition and the upward warping amount of the bent portion 10b are shown in FIG14-2.

[0110] The warp M is the distance between the outer arc point T and the central axis N of the bend. The central axis N is the midline between the upper and lower ends of the bend. The larger the warp M, the greater the bending stress on the bend, and the greater the risk of cable breakage in the bend.

[0111] As shown in Figure 14-1, the warping amount M of Comparative Example 1 is 0.4586 mm. As shown in Figure 14-2, the warping amount M of Comparative Example 2 is 0.4362 mm. Clearly, the warping amount of Comparative Example 1 is greater than that of Comparative Example 2, so the risk of wire breakage at the bend in Comparative Example 2 is lower.

[0112] Therefore, the more gradually the curvature line Q decreases, the lower the risk of the wiring of the bent portion 10 b being broken.

[0113] Optionally, the coordinates corresponding to all the curvature radii of the second curved surface q2 are connected to form a curvature line Q, and the curvature line Q of the second curved surface q2 satisfies a quadratic function, and the curvature line Q is a parabola.

[0114] In some embodiments, the curvature line Q may also be a non-parabola, for example, it may be a multi-segment line, a curved line segment combined with an oblique line segment, or a connection of multiple arc segments, etc.

[0115] Referring to FIG. 15 , optionally, in the first direction x, a length h1 of the first portion 21 is greater than a length h2 of the second portion 22 .

[0116] Optionally, the sum of the length h1 of the first portion 21 and the length h2 of the two second portions 22 constitutes the total length. The length h2 of a single second portion 22 accounts for 4% to 10% of the total length, for example, 4%, 5%, 6%, 7%, 8%, 9%, or 10%. The length h1 of the first portion 21 accounts for 80% to 92% of the total length, for example, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, or 92%.

[0117] It can be understood that since the curvature radius of the first curved surface q1 of the first part 21 is greater than the curvature radius of the second curved surface q2 of the second part 22, at the same total length, the longer the length of the first part 21 and the shorter the length of the second part 22, the lower the risk of wiring breakage in the bending part 10b.

[0118] Furthermore, the longer the second portion 22, the greater the bending stress on the bent portion 10b in the corresponding area, and the greater the required bezel width of the display device 100. Conversely, the shorter the second portion 22, the more difficult it is to round the corners of the cover plate 20. Therefore, to reduce the risk of breakage in the routing of the bent portion 10b while meeting the requirements of a narrow bezel and rounded corners, the length h2 of a single second portion 22 is designed to account for 4% to 10% of the total length.

[0119] Optionally, the curvature radius of the first curved surface q1 is less than or equal to 1500 mm, the maximum curvature radius of the second curved surface q2 is less than or equal to the curvature radius of the first curved surface q1, and the minimum curvature radius of the second curved surface q2 is greater than or equal to 50 mm.

[0120] For example, the minimum curvature radius of the second curved surface q2 can be 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm or 200 mm.

[0121] The minimum curvature radius of the second curved surface q2 is not less than 50 mm to protect the routing of the bent portion 10b.

[0122] It is understandable that when the curvature radius of the first curved surface q1 is greater than 1500 mm, for a small-sized display device 100, the display surface of the display device 100 is almost equivalent to a plane, and the effect of a curved screen cannot be achieved. Therefore, the curvature radius of the first curved surface is selected to be less than or equal to 1500 mm to achieve a curved screen.

[0123] Since the edge area of ​​the display device 100 is in a contracted narrow-edge state, if the minimum curvature radius of the second curved surface q2 is too small, a longer dimension is required for transition, which is not conducive to a narrow edge. Moreover, the longer the arc length of the second curved surface q2, the greater the bending stress in the corresponding bent portion 10b area. Therefore, the minimum curvature radius of the second curved surface q2 is selected to be greater than or equal to 50 mm to ensure the safe routing of the bent portion 10b and meet the narrow edge requirement of the edge area of ​​the display device 100.

[0124] The maximum curvature radius of the second curved surface q2 is smaller than or equal to the curvature radius of the first curved surface q1, so that the first curved surface q1 can transition to the second curved surface q2 more smoothly and quickly, reducing the abruptness of the transition.

[0125] Optionally, the cover plate 20 further includes a third portion 23 connected to a side of the second portion 22 away from the first portion 21. A side of the third portion 23 facing the display panel 10 is a third curved surface q3, which is connected to the second curved surface q2. In the first direction x, the radius of curvature of the third curved surface q3 is less than or equal to the radius of curvature of the second curved surface q2.

[0126] The curvature radius of the third curved surface q3 decreases from the side of the third portion 23 connected to the second portion 22 to the side of the third portion 23 away from the second portion 22 .

[0127] In this embodiment, the third portion 23 with a decreasing curvature radius is located on the side of the second portion 22 away from the first portion 21, so that the side of the cover 20 is narrowed and adapted to the user's hand holding the display device, making the user's grip more comfortable.

[0128] Optionally, the maximum curvature radius of the third curved surface q3 is smaller than the minimum curvature radius of the second curved surface q2, and the minimum curvature radius of the third curved surface q3 is greater than or equal to 3 mm.

[0129] For example, the minimum curvature radius of the third curved surface q3 may be 3 mm, 5 mm, 10 mm, 20 mm, 30 mm, or 40 mm.

[0130] Please refer to Figure 15. Optionally, the cover 20 also includes an appearance surface wg facing the user. The appearance surface wg includes a first appearance surface g1 of the first part 21, a second appearance surface g2 of the second part 22, and a third appearance surface g3 of the third part 23. The first appearance surface g1 and the first surface q1 are arranged opposite to each other, the second appearance surface g2 and the second surface q2 are arranged opposite to each other, and the third appearance surface g3 and the third surface q3 are arranged opposite to each other.

[0131] The second curved surface g2 is connected to the side opposite the first curved surface g1, and the third curved surface g3 is connected to the side of the second curved surface g2 away from the first curved surface g1. In the first direction x, the radius of curvature of the first curved surface g1 is equal to the radius of curvature of the first curved surface q1 with which it overlaps. The radius of curvature of the second curved surface g2 is consistent with the radius of curvature of the second curved surface q2 with which it overlaps. The radius of curvature of the third curved surface g3 is consistent with the radius of curvature of the third curved surface q3 with which it overlaps.

[0132] Optionally, the appearance curved surface wg further includes an annular surface gh, which is connected to the outer periphery of the whole formed by the first appearance curved surface g1, the second appearance curved surface g2 and the third appearance curved surface g3. The annular surface gh is a chamfered arc surface.

[0133] The annular surface gh extends beyond the edges of the display panel 10. The annular surface gh on the long side faces and overlaps with the third curved surface q3, and the annular surface gh on the short side faces and overlaps with the first curved surface q1 and the second curved surface q2.

[0134] Using the chamfered arc surface as the annular surface gh makes the sides of the display device 100 smoother, thereby improving the grip and appearance.

[0135] Referring to FIG. 16 , the cover plate 20 of the display device 100 of another embodiment of the present application differs from the above embodiment in that the structure of the cover plate 20 is different. Specifically:

[0136] In the first direction x, the curvature radius of the first curved surface q1 is in a gradual state.

[0137] That is, in this embodiment, the first curved surface q1 with a constant curvature radius of the cover plate 20 of the display device 100 in any of the above embodiments is replaced by a first curved surface q1 with a gradually varying curvature radius, and other structures are similar or identical.

[0138] Optionally, the curvature radius of the first curved surface q1 gradually increases from the two side edges of the first curved surface q1 toward the central axis of the first curved surface q1. That is, the curvature radius of the first curved surface q1 gradually decreases from the center of the first curved surface q1 toward the two side edges of the first curved surface q1.

[0139] It should be noted that the curvature radius of the first curved surface q1 may also be other gradual forms, which can be set according to actual needs and will not be described in detail here.

[0140] 2 to 16 , the present invention also provides a cover plate 20 for attaching to a display panel 10. The display panel 10 includes a display body 10a, a bent portion 10b, and a binding portion 10c. The binding portion 10c is disposed on the back of the display body 10a through the bent portion 10b.

[0141] The cover plate 20 includes a first portion 21, which is used to cover at least a portion of the bent portion 10b from the front. The surface of the first portion 21 facing the display panel 10 is a first curved surface q1. The radius of curvature of any point on the first curved surface q1 along a first direction x is greater than or equal to 300 mm, and the first curved surface q1 covers at least the middle region of the bent portion. The first direction x is the long axis of the bent portion 10b.

[0142] The structure of the cover plate 20 of this embodiment is similar to or the same as the structure of the cover plate 20 of the display device 100 of the above embodiment, and will not be described in detail here.

[0143] The above is a detailed introduction to a cover plate and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A cover plate, arranged to be attached to a display panel, wherein the display panel comprises a display body, a bending portion and a binding portion, wherein the binding portion is arranged on the back of the display body through the bending portion; The cover plate includes a first portion, the first portion is configured to cover at least a portion of the bent portion from the front, and a side of the first portion facing the display panel is a first curved surface, wherein: In the first direction, the radius of curvature of any point of the first curved surface is greater than or equal to 300 mm, and the first curved surface at least covers the middle area of ​​the bending portion, and the first direction is the long axis direction of the bending portion.

2. The cover plate according to claim 1, wherein: In the first direction, the curvature radii of the first curved surfaces are equal, and the first portion is configured to fully cover the bent portion.

3. The cover plate according to claim 2, wherein: The cover plate further includes a second portion, wherein the second portion is connected to an opposite side of the first portion in the first direction, a side of the second portion facing the display panel is a second curved surface, and the second curved surface is connected to the first curved surface, wherein a curvature radius of the second curved surface decreases from a side of the second portion connected to the first portion to a side of the second portion away from the first portion; In the first direction, the maximum curvature radius of the second curved surface is less than or equal to the curvature radius of the first curved surface.

4. The cover plate according to claim 3, wherein: The radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 3 mm.

5. The cover plate according to claim 1, wherein: The cover plate further includes a second part, in the first direction, the first curved surface has an equal curvature radius, and the second part is connected to the opposite side of the first part, the first part and the second part are arranged as a whole to fully cover the bent portion, a side of the second part facing the display panel is a second curved surface, the second curved surface is connected to the first curved surface, wherein the curvature radius of the second curved surface decreases from the side of the second part connected to the first part to the side of the second part away from the first part; In the first direction, the maximum radius of curvature of the second curved surface is less than or equal to the radius of curvature of the first curved surface; In a two-dimensional coordinate system, the length of the second curved surface in the first direction is taken as the X-axis, the curvature radius of the second curved surface is taken as the Y-axis, the endpoint of the maximum curvature radius of the second curved surface is set as the first endpoint (0, a), a>0, the endpoint of the minimum curvature radius of the second curved surface is set as the second endpoint (b, c), b is the total length of the second curved surface in the first direction, c>0, and the line connecting the first endpoint and the second endpoint is a straight line; Among them, in the coordinate system corresponding to all the curvature radii of the second surface, except for the coordinates corresponding to the maximum curvature radius and the minimum curvature radius of the second surface, the coordinates corresponding to other curvature radii of the second surface are all located on the side of the straight line away from the origin.

6. The cover plate according to claim 5, wherein: The coordinates corresponding to all the curvature radii of the second curved surface are connected to form a curvature line, and the curvature line is a parabola.

7. The cover plate according to claim 5, wherein: In the first direction, the length of the first portion is greater than the length of the second portion.

8. The cover plate according to claim 5, wherein: The radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 50 mm.

9. The cover plate according to claim 5, wherein: The cover plate further includes a third portion, the third portion is connected to a side of the second portion away from the first portion, a side of the third portion facing the display panel is a third curved surface, the third curved surface is connected to the second curved surface, wherein the curvature radius of the third curved surface decreases in a direction from the side of the third portion connected to the second portion to the side of the third portion away from the second portion; In the first direction, a maximum curvature radius of the third curved surface is less than or equal to a curvature radius of the second curved surface.

10. The cover plate according to claim 9, wherein: The minimum curvature radius of the third curved surface is greater than or equal to 3 mm.

11. The cover plate according to claim 1, wherein: In the first direction, the radius of curvature of the first curved surface is gradually changing.

12. The cover plate according to claim 11, wherein: The curvature radius of the first curved surface gradually increases from the two side edges of the first curved surface toward the central axis of the first curved surface.

13. A display device, comprising: A display panel, the display panel comprising a display body, a bending portion and a binding portion, wherein the binding portion is arranged on the back side of the display body through the bending portion; A cover plate, wherein the cover plate is attached to the display side of the display panel by optical adhesive, the cover plate comprises a first part, the front side of the first part covers at least part of the bending portion, the side of the first part facing the display panel is a first curved surface, wherein in a first direction, the radius of curvature of any point of the first curved surface is greater than or equal to 300 mm, and the first curved surface covers at least the middle area of ​​the bending portion, and the first direction is the long axis direction of the bending portion.

14. The display device according to claim 13, wherein: In the first direction, the curvature radii of the first curved surfaces are equal, and the first portion completely covers the bent portion.

15. The display device according to claim 14, wherein: The cover plate further includes a second portion, wherein the second portion is connected to an opposite side of the first portion in the first direction, a side of the second portion facing the display panel is a second curved surface, and the second curved surface is connected to the first curved surface, wherein a curvature radius of the second curved surface decreases from a side of the second portion connected to the first portion to a side of the second portion away from the first portion; In the first direction, the maximum curvature radius of the second curved surface is less than or equal to the curvature radius of the first curved surface.

16. The display device according to claim 15, wherein: The radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 3 mm.

17. The display device according to claim 13, wherein: The cover plate further includes a second part, in the first direction, the first curved surface has an equal curvature radius, and the second part is connected to the opposite side of the first part, the first part and the second part as a whole fully cover the bent portion, a side of the second part facing the display panel is a second curved surface, the second curved surface is connected to the first curved surface, wherein the curvature radius of the second curved surface decreases from the side of the second part connected to the first part to the side of the second part away from the first part; In the first direction, the maximum radius of curvature of the second curved surface is less than or equal to the radius of curvature of the first curved surface; In a two-dimensional coordinate system, the length of the second curved surface in the first direction is taken as the X-axis, the curvature radius of the second curved surface is taken as the Y-axis, the endpoint of the maximum curvature radius of the second curved surface is set as the first endpoint (0, a), a>0, the endpoint of the minimum curvature radius of the second curved surface is set as the second endpoint (b, c), b is the total length of the second curved surface in the first direction, c>0, and the line connecting the first endpoint and the second endpoint is a straight line; Among them, in the coordinate system corresponding to all the curvature radii of the second surface, except for the coordinates corresponding to the maximum curvature radius and the minimum curvature radius of the second surface, the coordinates corresponding to other curvature radii of the second surface are all located on the side of the straight line away from the origin.

18. The display device according to claim 17, wherein: The coordinates corresponding to all the curvature radii of the second curved surface are connected to form a curvature line, and the curvature line is a parabola.

19. The display device according to claim 17, wherein: In the first direction, the length of the first portion is greater than the length of the second portion.

20. The display device according to claim 17, wherein: The radius of curvature of the first curved surface is less than or equal to 1500 mm, and the minimum radius of curvature of the second curved surface is greater than or equal to 50 mm.

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