Display module and display device

Abstract

The embodiment of the invention provides a display module and a display device. The display module comprises a folding area and a non-folding area arranged on at least one side of the folding area, the display module comprises a display panel and a back plate, the back plate is arranged on one side of the display panel, a groove is formed in the folding area of the back plate, the groove is filled with flexible materials, and the thickness of the part, provided with the groove, of the back plate is larger than that of the non-folding area. The thickness of the back plate is smaller than that of the non-folding area. The back plate is provided with the groove in the folding area, and the thickness of the part, provided with the groove, of the back plate is smaller than that of the part, located in the non-folding area, of the back plate, so that the bending performance of the display module can be improved by reducing the thickness of the back plate in the folding area, and the impact resistance of the display module is improved by increasing the thickness of the part in the non-folding area; therefore, the anti-impact performance and the bending performance of the display module are both considered, the grooves are filled with the flexible materials, the grooves can be flattened, and follow-up film layer preparation is facilitated.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) display devices are widely used due to their advantages such as self-luminescence and flexibility. With the development of display devices, flexible display devices are becoming more and more popular in order to increase the screen-to-body ratio and facilitate portability. However, some problems have been found in the preparation and use of flexible display devices: in order to improve the bendability, flexible display devices will use flexible module materials, and will not use high-hardness materials such as thick glass cover plates for protection. As a result, when the flexible display device is impacted, it can only be protected by the flexible module material, and the protection ability is poor; and in order to reduce the space occupied by the flexible display device, the bending radius of the flexible display device will be reduced, resulting in the flexible display device being affected by tensile strain during the bending process. The elongation rate of the module material is close to the plastic strain point, and plastic strain is prone to occur, resulting in poor module flatness. In foldable display devices, it appears as obvious creases.

[0003] Therefore, existing flexible display devices have the technical problem of being unable to take into account both impact resistance and bending performance. Summary of the invention

[0004] The embodiments of the present application provide a display module and a display device to solve the technical problem that existing flexible display devices cannot take into account both impact resistance and bending performance.

[0005] In order to achieve the above object, according to a first aspect of the present application, a display module is provided, the display module comprising a folding area and a non-folding area arranged on at least one side of the folding area, the display module comprising:

[0006] Display panel;

[0007] A back plate, arranged on one side of the display panel;

[0008] The back plate is provided with a groove in the folding area, the groove is filled with flexible material, and the thickness of the portion of the back plate provided with the groove is smaller than the thickness of the portion of the back plate located in the non-folding area.

[0009] Optionally, the back panel includes a first part, a second part and a third part, the first part is arranged in the non-folding area, the second part and the third part are arranged in the folding area, the second part is arranged between the first part and the third part, the thickness of each part of the first part is equal, the thickness of each part of the third part is equal, and the thickness of the second part decreases successively along the direction from the first part to the third part.

[0010] Optionally, the back panel includes a fourth part and a fifth part, the fourth part is arranged in the non-folding area, the fifth part is arranged in the folding area, and the fifth part includes a plurality of grooves arranged at intervals, and there is a gap between the bottom surface of the groove and the side of the back panel away from the display panel.

[0011] Optionally, the non-folding area includes a first non-folding area and a second non-folding area arranged on both sides of the folding area, and along the direction from the first non-folding area to the second non-folding area, the plurality of grooves are arranged at intervals, and along the direction perpendicular to the first non-folding area to the second non-folding area, the plurality of grooves extend from the left side of the display module to the right side of the display module.

[0012] Optionally, the back panel includes a sixth part and a seventh part, the sixth part is arranged in the non-folding area, the seventh part is arranged in the folding area, and the seventh part includes a plurality of grooves arranged at intervals, and the grooves run through the back panel.

[0013] Optionally, the non-folding area includes a first non-folding area and a second non-folding area arranged on both sides of the folding area, and a plurality of the grooves are arranged at intervals along a direction from the first non-folding area to the second non-folding area, and a plurality of the grooves are arranged at intervals along a direction perpendicular to the first non-folding area to the second non-folding area.

[0014] Optionally, along the direction from the first non-folding area to the second non-folding area, the density of the grooves located in the edge area of ​​the folding area is less than the density of the grooves located in the middle area of ​​the folding area, and two adjacent rows of the grooves are staggered; along the direction perpendicular to the first non-folding area to the second non-folding area, the grooves located in the edge area of ​​the display module extend to the edge of the display module.

[0015] Optionally, the display module further includes an adhesive layer, the adhesive layer is disposed between the display panel and the back plate, and the adhesive layer includes the flexible material.

[0016] Optionally, the display module further includes an adhesive layer and a filling layer, the adhesive layer is arranged between the display panel and the back plate, and the filling layer includes the flexible material.

[0017] Optionally, the display module further includes a protective cover plate, which is disposed on a side of the display panel away from the back plate, and the protective cover plate includes a buffer groove, which is disposed corresponding to the trench.

[0018] Optionally, the buffer groove is arranged on a side of the protection cover plate away from the display panel, the digging groove is arranged on a side of the back plate close to the display panel, and the width of the buffer groove is less than or equal to the width of the digging groove;

[0019] Alternatively, the buffer groove is arranged on a side of the protection cover plate close to the display panel, the digging groove is arranged on a side of the back plate away from the display panel, and the width of the buffer groove is greater than or equal to the width of the digging groove.

[0020] According to a second aspect of the present application, a display device is provided, comprising a display module as described in any one of the above embodiments.

[0021] The embodiment of the present application provides a display module and a display device; the display module includes a folding area and a non-folding area arranged on at least one side of the folding area, the display module includes a display panel and a back plate, the back plate is arranged on one side of the display panel, wherein the back plate is provided with a groove in the folding area, the groove is filled with a flexible material, and the thickness of the portion of the back plate provided with the groove is less than the thickness of the portion of the back plate located in the non-folding area. By providing the back plate with a groove in the folding area, and the thickness of the portion of the back plate provided with the groove is less than the thickness of the portion of the back plate located in the non-folding area, the bending performance of the display module can be improved by reducing the thickness of the back plate in the folding area, and by making the thickness of the portion of the non-folding area larger, the impact resistance of the display module is improved, thereby taking into account both the impact resistance and the bending performance of the display module, and the groove is filled with a flexible material, so that the groove can be flattened, which is convenient for subsequent film layer preparation.

[0022] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0024] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0025] Figure 1 A schematic diagram of a membrane material provided in an embodiment of the present application.

[0026] Figure 2 A curve diagram showing the variation of strain with stress of the film material provided in the embodiment of the present application.

[0027] Figure 3 A bar chart of the non-plastic deformation thickness of different film materials provided in the embodiments of the present application at different bending radii.

[0028] Figure 4 A comparative bar chart of the height differences of various regions of a display device corresponding to backplanes of different thicknesses provided in an embodiment of the present application.

[0029] Figure 5 A comparison diagram of display images when the cover thickness of the display device provided in an embodiment of the present application is different.

[0030] Figure 6 A schematic diagram of a display device provided in an embodiment of the present application when it is impacted, and a curve diagram of its thickness and impact resistance.

[0031] Figure 7 This is a first schematic diagram of a display module provided in an embodiment of the present application.

[0032] Figure 8 This is a first schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application.

[0033] Fig. 9 A second schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application.

[0034] Fig.10 A first schematic diagram of a backplane provided in an embodiment of the present application.

[0035] Fig.11 A third schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application.

[0036] Fig.12 A second schematic diagram of the backplane provided in an embodiment of the present application.

[0037] Fig.13 This is a fourth schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application.

[0038] Fig.14 A second schematic diagram of a display module provided in an embodiment of the present application.

[0039] Fig.15 This is a third schematic diagram of a display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below 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, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0041] In order to illustrate the principle of solving the technical problem in the embodiment of the present application, some drawings are provided and described in combination with text. Figure 1 As shown, a membrane material includes a first membrane material 11 and a second membrane material 12, and the distance between the stress neutral layer of the membrane material and the surface of the first membrane material 11 is y, and y is equal to half of the thickness of the membrane material, that is, half of the sum of the thickness of the first membrane material 11 and the thickness of the second membrane material 12. The bending radius of the membrane material is R, and when the membrane material is bent, its surface strain ε can be determined according to the deformation from the first point a to the second point b on the membrane material, and the length between the two is represented by ab, and the change value of the length between the two is represented by Δab. The specific formula is as follows: ε=Δab / ab=((R+y)dθ-R dθ) / dx=y dθ / R dθ=y / R. From the above formula, we can see that, under the premise of the same bending radius, the lower the thickness, the lower the strain of the film material. It can be understood that the display defects such as creases of flexible display devices come from the plastic deformation of the film material and the change in the thickness of the glue material. Because the material modulus of the film material is nearly two orders of magnitude higher than that of the glue material, it has a greater impact on display defects such as creases. Therefore, the film material can be designed to reduce the impact of poor bending performance such as creases.

[0042] At the same time, if Figure 2 As shown, Figure 2 The horizontal axis is strain, the unit is % (percentage), and the vertical axis is stress, the unit is MPa, i.e., megapascals. Figure 2 It can be seen that when the membrane material does not undergo plastic deformation, Figure 2 Take point c in the figure as an example. At this time, the strain is Δε and the stress is Δσ. The two show a linear relationship. However, when the strain of the membrane material exceeds the yield point of the material, Figure 2 Point A is taken as the yield point of the material. Different membrane materials have different stresses when they yield. At this time, the membrane material will undergo obvious plastic deformation, and the length will undergo irreversible elongation during stretching and reduction. For example, from point A to point B, from point B to point C, and from point C to point D, the strain and stress will not be linearly related, and the length will be irreversible. At point D, the membrane material will break. Different membrane materials have different stresses when they break, and different elongations when they break. Figure 2 It can be seen that when the strain of the membrane material is small, plastic deformation of the membrane material can be avoided.

[0043] And because the display device is composed of multiple film materials, in the bent state, the deformation direction of each film material is consistent, so when the film materials in the screen are plastically deformed, the overall unevenness of the display device will be aggravated, thus causing creases. According to the plastic strain points of different materials, the critical thickness of different film materials without plastic deformation under various bending radius conditions is calculated, such as Figure 3 As shown, the bar graph is a bar graph of the critical thickness of the film material without plastic deformation, the horizontal axis is the bending radius, the unit is millimeter, and the vertical axis is the thickness of the single substrate without plastic deformation, among which, respectively, are the bar graphs of the flexible cover plate, the protective cover plate, the polarizer and the back plate, from Figure 3 It can be seen that the smaller the bending radius, the smaller the thickness of the film material is required to be without plastic deformation. Further simulations are performed to compare the height difference of different areas of the display device after bending when the backplane thickness is 50 microns and 25 microns under the same bending radius and other conditions. Figure 4 As shown, the vertical axis is the height difference in micrometers, and the horizontal axis is the backplane of different thicknesses. Figure 4 It can be seen that the height difference of the display device corresponding to the back panel with a thickness of 25 microns is relatively low, which further illustrates that the smaller the thickness of the back panel, the better the crease performance of the folding area 201a.

[0044] like Figure 5 As shown, the display images obtained when the thickness of the protective cover of the display device is different are compared. Figure 5 (a) and Figure 5 The display devices corresponding to (b) in the figure all use ultra-thin glass (Ultra Foldable Glass, UFG) of different thicknesses. The difference between the two is that: Figure 5 The display device in (a) uses ultra-thin glass of unequal thickness, with a thickness of 30 microns. Figure 5 The thickness of the ultra-thin glass of unequal thickness used in the display device (b) is 70 microns, and the thickness here is the thickness of the non-folding area 201b. Figure 5 (a) and Figure 5 As can be seen from (b) in the figure, the display device with larger ultra-thin glass thickness performs better.

[0045] like Figure 6 As shown, Figure 6 The display device test shown in (a) is as follows: Figure 6 As shown in (a) of FIG. 1 , a display device including a film material 101, a film material 2 102, a display panel film 103, a film material 3 104 and a film material 4 105 arranged in sequence is taken as an example. When the display device is impacted by an impact object 106, the following is obtained: Figure 6 The curve shown in (b) is Figure 6 The horizontal axis of (b) is the thickness of the film material under the display panel film. Figure 6The vertical axis of (b) is the impact resistance of the display device. Figure 6 It can be seen that as the thickness of the film material under the display panel film increases, the impact resistance of the display device screen increases, making the display device less likely to bend or deform under impact.

[0046] Based on the above analysis, the embodiments of the present application provide a display module and a display device to solve the technical problem that the existing flexible display devices cannot take into account both impact resistance and bending performance.

[0047] Figure 7 This is a first schematic diagram of a display module provided in an embodiment of the present application. Figure 8 This is a first schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application. Fig. 9 A second schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application. Fig.10 A first schematic diagram of a backplane provided in an embodiment of the present application; Fig.10 (a) is a first plan view of the backplane provided in the embodiment of the present application, Fig.10 (b) in Fig.10 An enlarged view of A1 in (a). Fig.11 A third schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application. Fig.12 A second schematic diagram of a backplane provided in an embodiment of the present application; Fig.12 (a) is a second plan view of the backplane provided in the embodiment of the present application, Fig.12 (b) in Fig.12 An enlarged view of A2 in (a). Fig.13 This is a fourth schematic diagram of the backplane and the adhesive layer provided in an embodiment of the present application. Fig.14 A second schematic diagram of a display module provided in an embodiment of the present application. Fig.15 This is a third schematic diagram of a display module provided in an embodiment of the present application.

[0048] like Figures 7 to 15 As shown, an embodiment of the present application provides a display module 2, which includes a folding area 201a and a non-folding area 201b arranged on at least one side of the folding area 201a, and the display module 2 includes a display panel 21 and a backplane 23, and the backplane 23 is arranged on one side of the display panel 21, wherein the backplane 23 is provided with a groove 32 in the folding area 201a, and the groove 32 is filled with a flexible material, and the thickness of the portion of the backplane 23 provided with the groove 32 is less than the thickness of the portion of the backplane 23 located in the non-folding area 201b (for example, Figure 8The middle back plate 23 is provided with a groove 32, and the portion of the back plate provided with the groove 32 includes a third portion, and the thickness L2 of the third portion 313 of the back plate located in the folding area 201a is less than the thickness L1 of the portion of the back plate 23 located in the non-folding area 201b).

[0049] The embodiment of the present application provides a display module 2, in which the display module 2 is provided with a groove 32 in the folding area 201a of the back panel 23, and the thickness of the portion of the back panel provided with the groove is less than the thickness of the portion of the back panel 23 located in the non-folding area 201b. The bending performance of the display module 2 can be improved by reducing the thickness of the back panel 23 in the folding area 201a, and the impact resistance of the display module 2 is improved by making the thickness of the portion of the non-folding area 201b larger, thereby taking into account both the impact resistance and the bending performance of the display module 2. In addition, the groove is filled with a flexible material, and the groove can be flattened to facilitate the subsequent film layer preparation.

[0050] In some embodiments, Figure 8 As shown, the back plate 23 includes a first portion 311, a second portion 312 and a third portion 313, the first portion 311 is arranged in the non-folding area 201b, the second portion 312 and the third portion 313 are arranged in the folding area 201a, the second portion 312 is arranged between the first portion 311 and the third portion 313, and the thickness of each portion of the first portion 311 is equal (for example, at Figure 8 In the embodiment, the thickness of the first part 311 is L1), and the thickness of each part of the third part 313 is equal (for example, Figure 8 In the embodiment, the thickness of the third part 313 is L2), and the thickness of the second part 312 decreases in sequence from the first part 311 to the third part 313. By making the back plate 23 include the first part 311, the second part 312 and the third part 313, the first part 311 is arranged in the non-folding area 201b, the second part 312 and the third part 313 are arranged in the folding area 201a, the thickness of each part of the first part 311 is equal, the thickness of each part of the third part 313 is equal, and the thickness of the second part 312 decreases in sequence from the first part 311 to the third part 313, the thickness of the part of the back plate 23 located in the folding area 201a can be made smaller, thereby improving the bending performance of the back plate 23, and correspondingly improving the bending performance of the display module 2, and the thickness of the part of the back plate 23 located in the non-folding area 201b is larger, which can improve the impact resistance of the display module 2, and take into account both the bending performance and the impact resistance of the display module 2. The thickness of the second part 312 decreases gradually from the first part 311 to the third part 313, so a transition can be made through the second part 312 to prevent the thickness of the back plate 23 from changing too much and causing the back plate 23 to fail when bent, and to facilitate the formation of various parts when forming the back plate 23.

[0051] Specifically, Figure 8 As shown, it can be seen that the minimum thickness of the second part 312 of the back plate 23 is equal to the thickness of the third part 313, and the maximum thickness of the second part 312 is equal to the thickness of the first part 311. When etching the back plate 23 to form various parts, the part of the folding area 201a can be directly etched to form the first part 311, the second part 312 and the third part 313, thereby improving the preparation efficiency.

[0052] Specifically, Figure 8 As shown, the groove 32 is in the form of a concave groove 321 .

[0053] Specifically, the thickness of the first part ranges from 10 microns to 100 microns, the thickness of the third part ranges from 5 microns to 50 microns, the difference between the maximum thickness of the second part and the minimum thickness of the second part ranges from 10 microns to 90 microns, the length of the side wall of the second part ranges from 5 microns to 2000 microns, and the acute angle formed by the side wall of the second part and the top surface of the third part ranges from 5 degrees to 80 degrees.

[0054] In some embodiments, Fig. 9 , Fig.10 As shown, the back plate 23 includes a fourth portion 314 and a fifth portion 315, the fourth portion 314 is arranged in the non-folding area 201b, the fifth portion 315 is arranged in the folding area 201a, and the fifth portion 315 includes a plurality of slots 32 arranged at intervals, and there is a gap between the bottom surface of the slots 32 and the side of the back plate 23 away from the display panel 21. By making the fourth portion 314 arranged in the non-folding area 201b, the fifth portion 315 arranged in the folding area 201a, and the fifth portion 315 including the plurality of slots 32 arranged at intervals, the back plate 23 can be provided with a plurality of slots 32 in the folding area 201a to improve the bending performance of the back plate 23, and the fourth portion 314 can ensure the impact resistance of the display module 2, thereby taking into account both the bending performance and the impact resistance of the display module 2. Furthermore, there is a gap between the bottom surface of the groove 32 and the side of the back plate 23 away from the display panel 21 , so the area where the groove 32 is provided can still have a certain support, thereby improving the impact resistance of the display module 2 .

[0055] Specifically, Fig. 9 As shown, the groove 32 is in the form of a via hole 322 .

[0056] Specifically, Fig. 9As shown, the thickness of each part of the fourth part 314 can be equal, so that the fourth part 314 supports the display panel 21, thereby improving the impact resistance of the display module 2, and the thickness of the part of the fifth part 315 where no groove 32 is provided can be equal, so that the part of the fifth part 315 where no groove 32 is provided can support the display panel 21, thereby improving the impact resistance of the display module 2.

[0057] Specifically, Fig. 9 As shown, the thickness of the portion of the fifth portion 315 where the groove 32 is not provided can be equal to the thickness of the fourth portion 314, so that the bending performance of the display module 2 is improved by the groove 32, and the impact resistance of the display module 2 is improved by the area where the groove 32 is not provided in the fourth portion 314 and the fifth portion 315, taking into account both the impact resistance and the bending performance of the display module 2. However, the embodiment of the present application is not limited thereto, and the thickness of the portion of the fifth portion 315 where the groove 32 is not provided can be less than the thickness of the fourth portion 314.

[0058] Specifically, the depth of the groove 32 ranges from one third to one half of the thickness of the fourth portion.

[0059] Specifically, the width of the portion of the fifth portion provided with the groove ranges from half of the width of the folding area to the width of the folding area. For example, when the groove is formed in the fifth portion, the groove may be provided in some areas and not provided in some areas. For example, the spacing between the groove closest to the first non-folding area and the groove closest to the second non-folding area may be smaller than the width of the folding area.

[0060] Specifically, the depth of the via hole ranges from 5 micrometers to 100 micrometers. The shape of the via hole includes one or more of a circle, an ellipse, a triangle and a square.

[0061] In some embodiments, Fig.10As shown, the non-folding area 201b includes a first non-folding area 301 and a second non-folding area 302 arranged on both sides of the folding area 201a, and along the direction from the first non-folding area 301 to the second non-folding area 302, a plurality of the grooves 32 are arranged at intervals, and along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, a plurality of the grooves 32 extend from the left side of the display module 2 to the right side of the display module 2. By arranging the plurality of grooves 32 at intervals along the direction from the first non-folding area 301 to the second non-folding area 302, when the display module 2 is bent, all parts located in the folding area 201a can be bent, thereby improving the bending performance of the display module 2, and the parts of the folding area 201a where no grooves 32 are formed can be supported, thereby improving the impact resistance of the display module 2; and along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, the plurality of grooves 32 extend from the left side of the display module 2 to the right side of the display module 2, so that the plurality of grooves 32 can pass through the back panel 23 from left to right, so that when the display module 2 is bent, all parts of the display module 2 located in the folding area 201a can be bent, and the bending performance is good, thereby improving the bending performance of the display module 2.

[0062] Specifically, Fig.10 (a) and Fig.10 As shown in (b), the grooves 32 are arranged at intervals along the direction from the first non-folding area 301 to the second non-folding area 302. Then, in the folding area 201a, each groove 32 can improve the flexibility of each part from top to bottom, thereby improving the bending performance of the display panel 21. Along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, the grooves 32 extend from the left side of the display module 2 to the right side of the display module 2. Then, the display module 2 can be bent from left to right with better bending performance, thereby improving the bending performance of the display panel 21.

[0063] Specifically, along the direction from the first non-folding area 301 to the second non-folding area 302 , the intervals between any two adjacent grooves 32 are equal.

[0064] The above embodiment is described by taking the example that the groove 32 extends from the left side of the display module 2 to the right side of the display module 2 along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, but the embodiments of the present application are not limited to this. The groove 32 may have a gap with the left side of the display module 2, or there may be a gap between the groove 32 and the right side of the display module 2, or there may be a gap between the groove 32 and both the left and right sides of the display module 2.

[0065] In some embodiments, Fig.11 , Fig.12As shown, the back plate 23 includes a sixth portion 316 and a seventh portion 317, the sixth portion 316 is arranged in the non-folding area 201b, the seventh portion 317 is arranged in the folding area 201a, and the seventh portion 317 includes a plurality of slots 32 arranged at intervals, and the slots 32 penetrate the back plate 23. By making the sixth portion 316 arranged in the non-folding area 201b, the seventh portion 317 arranged in the folding area 201a, and the seventh portion 317 including a plurality of slots 32 arranged at intervals, and the slots 32 penetrate the back plate 23, the back plate 23 can be provided with a plurality of slots 32 in the folding area 201a to improve the bending performance of the back plate 23, and the sixth portion 316 can ensure the impact resistance of the display module 2, thereby taking into account both the bending performance and the impact resistance of the display module 2.

[0066] Specifically, Fig.11 , Fig.12 As shown, the groove 32 is a through hole 323 .

[0067] Specifically, compared with the via hole 322 , the through hole 323 can further improve the bending performance of the display module 2 .

[0068] Specifically, Fig.11 As shown, the thickness of each part of the sixth part 316 can be equal, so that the sixth part 316 supports the display panel 21 and improves the impact resistance of the display module 2, and the thickness of the part of the seventh part 317 without the groove 32 can be equal, so that the part of the seventh part 317 without the groove 32 can support the display panel 21 and improve the impact resistance of the display module 2.

[0069] Specifically, Fig.11 As shown, the thickness of the portion of the seventh portion 317 where the groove 32 is not provided can be equal to the thickness of the sixth portion 316, so that the bending performance of the display module 2 is improved by the groove 32, and the impact resistance of the display module 2 is improved by the area where the groove 32 is not provided in the sixth portion 316 and the seventh portion 317, taking into account both the impact resistance and the bending performance of the display module 2. However, the embodiment of the present application is not limited thereto, and the thickness of the portion of the seventh portion 317 where the groove 32 is not provided can be less than the thickness of the sixth portion 316.

[0070] Specifically, the shape of the through hole includes one or more of a circle, an ellipse, a triangle and a square.

[0071] Specifically, the width of the portion of the seventh portion provided with the groove ranges from half of the width of the folding area to the width of the folding area. For example, when the groove 32 is formed in the seventh portion, the groove 32 may be provided in some areas and not provided in some areas. For example, the spacing between the groove 32 closest to the first non-folding area and the groove 32 closest to the second non-folding area may be smaller than the width of the folding area.

[0072] In some embodiments, Fig.12 As shown, the non-folding area 201b includes a first non-folding area 301 and a second non-folding area 302 arranged on both sides of the folding area 201a, and along the direction from the first non-folding area 301 to the second non-folding area 302, a plurality of the grooves 32 are arranged at intervals, and along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, a plurality of the grooves 32 are arranged at intervals. By arranging the plurality of grooves 32 at intervals along the direction from the first non-folding area 301 to the second non-folding area 302, when the display module 2 is bent, all parts located in the folding area 201a can be bent, thereby improving the bending performance of the display module 2, and the parts of the folding area 201a where no grooves 32 are formed can be supported, thereby improving the impact resistance of the display module 2; and along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, the plurality of grooves 32 are arranged at intervals to avoid the grooves 32 cutting off multiple parts of the back panel 23, so that the back panel 23 can still support the display panel 21 in the folding area 201a, thereby improving the impact resistance of the display module 2.

[0073] Specifically, Fig.12 (a) and Fig.12 As shown in (b), along the direction from the first non-folding area 301 to the second non-folding area 302, multiple grooves 32 are arranged at intervals, so that in the folding area 201a, each groove 32 can improve the flexibility of each part from top to bottom, and improve the bending performance of the display panel 21. In addition, along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, the grooves 32 are arranged at intervals, so that the back plate 23 is provided with grooves 32 in the direction from left to right, and the display module 2 can be bent with good bending performance, thereby improving the bending performance of the display panel 21. And because the grooves 32 penetrate the back plate 23, in order to prevent the back plate 23 from being unable to support the display panel 21 or even breaking, the grooves 32 can be arranged at intervals to improve the impact resistance of the display module 2.

[0074] In some embodiments, Fig.12 (a) and Fig.12As shown in (b), along the direction from the first non-folding area 301 to the second non-folding area 302, the arrangement density of the grooves 32 located in the edge area of ​​the folding area 201a is less than the arrangement density of the grooves 32 located in the middle area of ​​the folding area 201a, and the grooves 32 in two adjacent rows are staggered; along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, the grooves 32 located in the edge area of ​​the display module 2 extend to the edge of the display module 2. By making the arrangement density of the grooves 32 located in the edge area of ​​the folding area 201a smaller than the arrangement density of the grooves 32 located in the middle area of ​​the folding area 201a along the direction from the first non-folding area 301 to the second non-folding area 302, the grooves 32 can be made in the edge area of ​​the folding area 201a to prevent the abnormality caused by the large performance difference between the non-folding area 201b and the folding area 201a, and the grooves 32 in two adjacent rows are arranged in a staggered manner to avoid the problem that the supporting performance of some areas of the back plate 23 deteriorates due to the grooves 32 being arranged in the same column, and the grooves 32 located in the edge area of ​​the display module 2 extend to the edge of the display module 2, which can further improve the bending performance of the display module 2 and prevent the bending stress in the edge area from being too large or even unable to bend.

[0075] Specifically, it can be seen that in the area of ​​the folding area 201a close to the first non-folding area 301 and the second non-folding area 302, the number of grooves 32 is relatively small, while the number of grooves 32 in the middle area of ​​the folding area 201a is relatively large, and a transition can be made through the edge area of ​​the folding area 201a. It can also be seen that along the direction perpendicular to the first non-folding area 301 to the second non-folding area 302, the spacing between adjacent grooves 32 in the edge area of ​​the folding area 201a is greater than the spacing between adjacent grooves 32 in the middle area of ​​the folding area 201a.

[0076] Specifically, it can be seen that in the edge area of ​​the display module 2, the width of the groove 32 in the edge area of ​​the folding area 201a is smaller than the width of the groove 32 in the middle area of ​​the folding area 201a.

[0077] In some embodiments, Figure 7 , Figure 8 , Fig. 9 , Fig.11 As shown, the display module 2 further includes an adhesive layer 22, which is disposed between the display panel 21 and the back plate 23, and the adhesive layer includes the flexible material. By making the adhesive layer include the flexible material, the adhesive layer is filled in the trench, and no additional film layer is required, and the bonding effect between the back plate 23 and the display panel 21 can be improved.

[0078] Specifically, it can be understood that in different embodiments, the groove 32 will have different shapes. For example, in some embodiments, the groove is in the form of a groove 321, in some embodiments, the groove is in the form of a via 322, and in some embodiments, the groove is in the form of a through hole 323. It can be understood that grooves, vias and through holes are essentially grooves.

[0079] It can be understood that since the grooves, grooves, vias and through holes shown in the embodiments of the present application are filled with an adhesive layer or a filling layer, the structures of the grooves, grooves, vias and through holes are not shown in the accompanying drawings. It can be understood that the structures of the grooves, grooves, vias and through holes can be determined based on the structures of the adhesive layer and the filling layer.

[0080] Specifically, the material of the adhesive layer includes pressure-sensitive adhesive.

[0081] In some embodiments, Figure 7 , Fig.13 As shown, the display module 2 further includes an adhesive layer 22 and a filling layer 28, the adhesive layer 22 is disposed between the display panel 21 and the back plate 23, and the filling layer 28 includes the flexible material. By making the display module 2 further include an adhesive layer and a filling layer, by making the filling layer include a flexible material, and filling the filling layer in the groove 32, the surface of the back plate 23 is made flat, and the filling layer can improve the supporting performance of the back plate 23.

[0082] Specifically, the material of the filling layer includes one of polyurethane, thermoplastic polyurethane, and liquid optical adhesive (Optic Clear Resin, OCR). However, the embodiment of the present application is not limited thereto, and transparent optical adhesive (Optically Clear Adhesive, OCA), foam or plastic can also be used as the material of the filling layer.

[0083] Specifically, the elastic modulus of the filling layer ranges from 0.1 MPa to 1 Gpa.

[0084] Specifically, in order to illustrate the different structures of the display module 2, the above embodiments respectively illustrate the parts of the back panel 23 located in the non-folding area 201b using the first part 311, the fourth part 314 and the sixth part 316. It can be understood that the first part 311, the fourth part 314 and the sixth part 316 all refer to the parts of the back panel 23 located in the non-folding area 201b. Therefore, the structures of the first part 311, the fourth part 314 and the sixth part 316 can be the same, and the length, width and thickness of each part can be the same.

[0085] Specifically, it can be seen that the second part 312 of the back panel 23 and the third part 313 of the back panel 23 form a groove 32, and the groove 32 can be filled by an adhesive layer without setting an additional film layer for filling, thereby avoiding increasing the thickness of the display module 2 and increasing the process, thereby improving the preparation efficiency of the display module 2.

[0086] Specifically, Figure 7 As shown, the display module 2 further includes a heat dissipation layer 41 , a first support layer 42 , a second support layer 24 , a polarizer 25 , a first optical adhesive layer 26 , a protective cover plate 27 , a second optical adhesive layer 43 , a flexible cover plate 44 and a replaceable layer 45 .

[0087] Specifically, the material of the heat dissipation layer may be copper or graphite; the material of the first supporting layer may be stainless steel, titanium and carbon fiber; the second supporting layer may be a film layer formed by foam and / or a film layer formed by polyimide; the replaceable layer refers to a film layer that protects the display module and can be directly replaced.

[0088] Specifically, the material of the protective cover plate may be ultra-thin glass or ultra-thin glass of unequal thickness.

[0089] Specifically, the side of the back plate 23 with the groove is arranged toward the display panel 21 .

[0090] Specifically, the above embodiment is described by taking the display module having only one folding area as an example, but the embodiment of the present application is not limited thereto, and the display module may have multiple folding areas. And the display module may be applied to a sliding screen and a rolling screen.

[0091] Specifically, the display module in the above embodiment may be an inward folding display module (bent from the back plate toward the protective cover plate), so that a groove is formed on the side of the back plate close to the display panel to improve the bending performance. However, the embodiment of the present application is not limited thereto, and the display module may be an outward folding display module (bent from the protective cover plate toward the back plate).

[0092] Specifically, in the above embodiment, the display module is an inward-folding display module, and the protective cover plate is a protective cover plate of equal thickness design. However, the embodiments of the present application are not limited to this. The display module can be an outward-folding display module, and / or the protective cover plate is a protective cover plate of non-equal thickness design.

[0093] Specifically, the above embodiment is described by taking the side of the back plate with the groove facing the display panel as an example, but the embodiment of the present application is not limited to this. The side of the back plate with the groove may face the side away from the display panel.

[0094] In some embodiments, Fig.14 , Fig.15As shown, the display module 2 further includes a protective cover plate 27, which is disposed on a side of the display panel 21 away from the back plate 23, and includes a buffer groove 271, which is disposed corresponding to the digging groove 32. By providing the protective cover plate with a buffer groove, which is disposed corresponding to the digging groove, the impact resistance and bending performance of the display module can be further improved.

[0095] Specifically, Fig.14 , Fig.15 As shown, the thickness of the portion of the protective cover plate 27 provided with the buffer groove 271 is smaller than the thickness of the portion of the protective cover plate 27 located in the non-folding area 201b. By making the thickness of the portion of the protective cover plate provided with the buffer groove smaller than the thickness of the portion of the protective cover plate located in the non-folding area, the bending performance of the display module can be improved by reducing the thickness of the protective cover plate in the folding area, and by making the thickness of the protective cover plate in the non-folding area larger, the impact resistance of the display module can be improved, taking into account both the impact resistance and the bending performance of the display module.

[0096] In some embodiments, Fig.14 As shown, the buffer groove 271 is arranged on the side of the protective cover plate 27 away from the display panel 21, and the digging groove 32 is arranged on the side of the back plate 23 close to the display panel 21. When the display module can be an inward folding display module, by making the opening direction of the buffer groove consistent with the opening direction of the digging groove, the bending performance of the display module is better.

[0097] In some embodiments, Fig.14 As shown, the width of the buffer groove 271 is less than or equal to the width of the groove 32. Since the back plate is on the outer side of the bending of the display module, the width of the groove of the back plate can be greater than or equal to the width of the buffer groove, thereby improving the bending performance, and the width of the buffer groove can be relatively small, improving the impact resistance.

[0098] Specifically, Fig.14 As shown, a buffer groove 271 is formed between multiple parts of different thicknesses in the protective cover plate 27, and the width L3 of the buffer groove 271 is less than or equal to the width L4 of the groove 32. By making the width of the buffer groove less than or equal to the width of the groove, the bending performance of the display module can be better, and the impact resistance of the display module can be better.

[0099] Specifically, Fig.14 As shown, the opening direction of the buffer groove 271 faces the display panel.

[0100] Specifically, Fig.14As shown, the display module can be an inward folding display module, so that the opening direction of the buffer groove in the protective cover plate is consistent with the opening direction of the groove and is upward, and the display module has better bending performance. And because the back plate is on the bending outside of the display module, the width of the groove of the back plate can be greater than or equal to the width of the buffer groove, thereby improving the bending performance, and making the width of the buffer groove relatively small, improving the impact resistance.

[0101] Specifically, when the buffer groove is formed on the protective cover plate, the buffer groove may be filled with a filling material. For specific filling materials, reference may be made to the materials of the filling layer in the above embodiments, or other flexible materials may be used.

[0102] Specifically, the above embodiment is described by taking the example that the opening directions of the buffer groove in the protective cover plate and the groove in the back plate are consistent, but the embodiments of the present application are not limited to this. The buffer groove in the protective cover plate can be set on the side facing the display panel, and the groove in the back plate can face the side of the display panel.

[0103] Specifically, when the back panel includes the sixth part and the seventh part, since the bending performance of the back panel is better, the width of the grooved portion in the seventh part of the back panel can be made less than or equal to the width of the buffer groove, thereby improving the impact resistance of the display module while improving the bending performance of the display module.

[0104] Specifically, when the back plate includes the fourth part and the fifth part, when the bending performance of the back plate is improved compared to the bending performance when the back plate includes the first part, the second part and the third part, the width of the portion with the groove in the fifth part can be made less than or equal to the width of the buffer groove, thereby improving the impact resistance of the display module while improving the bending performance of the display module. When the back plate includes the fourth part and the fifth part, when the bending performance of the back plate remains unchanged or decreases compared to the bending performance when the back plate includes the first part, the second part and the third part, the width of the portion with the groove in the fifth part can be made greater than or equal to the width of the buffer groove.

[0105] In some embodiments, Fig.15 As shown, the buffer groove 271 is arranged on the side of the protective cover plate 27 close to the display panel 21, and the groove 32 is arranged on the side of the back plate 23 away from the display panel 21. By providing the groove on the side of the back plate away from the display panel and providing the buffer groove on the side of the protective cover plate facing the display panel, the bending performance of the display module in the outward folding display module can be better, and the impact resistance of the display module can be better.

[0106] Specifically, Fig.15 As shown, a filling layer 28 may be provided in the trench 32 , and a flattening layer 29 may be provided in the buffer trench 271 .

[0107] Specifically, Fig.15 As shown, the width L3 of the buffer groove 271 is greater than or equal to the width L4 of the groove 32. By making the width of the buffer groove greater than or equal to the width of the groove, the bending performance of the display module can be better and the impact resistance of the display module can be better.

[0108] Specifically, Fig.15 As shown, the display module can be an outward folding display module, so that the opening direction of the buffer groove in the protective cover plate is consistent with the opening direction of the digging groove and is downward, and the display module has better bending performance. And because the protective cover plate is on the bending outer side of the display module, the width of the buffer groove of the protective cover plate can be greater than or equal to the width of the digging groove of the back plate, thereby improving the bending performance, and making the width of the digging groove of the back plate relatively small, which can improve the impact resistance.

[0109] Specifically, Figure 7 , Fig.14 In the example, the width of the groove of the back plate is equal to the width of the folding area, but the embodiment of the present application is not limited thereto. The width of the groove of the back plate can be smaller than the width of the folding area. Fig.15 In the description, the width of the buffer groove of the protective cover plate is equal to the width of the folding zone. However, the embodiments of the present application are not limited thereto. The width of the buffer groove may be smaller than the width of the folding zone.

[0110] The above embodiments describe the display module 2 in detail from the perspective of various structures and the combination of various structures. It can be understood that when there is no conflict between the embodiments, the embodiments can be combined. For example, the back panel 23 includes a first part 311, a second part 312 and a third part 313, the first part 311 is arranged in the non-folding area 201b, the second part 312 and the third part 313 are arranged in the folding area 201a, the second part 312 is arranged between the first part 311 and the third part 313, the thickness of each part of the first part 311 is equal, the thickness of each part of the third part 313 is equal, and the thickness of the second part 312 decreases successively from the first part 311 to the third part 313. The display module 2 also includes an adhesive layer, which is arranged between the display panel 21 and the back panel 23, and the adhesive layer includes the flexible material.

[0111] Meanwhile, an embodiment of the present application provides a display device, which includes a display panel 21 as described in any of the above embodiments.

[0112] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0113] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0114] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0115] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A display module, characterized in that: The display module comprises a folding area and a non-folding area arranged on at least one side of the folding area, and the display module comprises: Display panel; A back plate, arranged on one side of the display panel; The back plate is provided with a groove in the folding area, the groove is filled with flexible material, and the thickness of the portion of the back plate provided with the groove is smaller than the thickness of the portion of the back plate located in the non-folding area.

2. The display module according to claim 1, characterized in that: The back panel includes a first part, a second part and a third part, the first part is arranged in the non-folding area, the second part and the third part are arranged in the folding area, the second part is arranged between the first part and the third part, the thickness of each part of the first part is equal, the thickness of each part of the third part is equal, and the thickness of the second part decreases successively along the direction from the first part to the third part.

3. The display module according to claim 1, characterized in that: The back panel includes a fourth part and a fifth part, the fourth part is arranged in the non-folding area, the fifth part is arranged in the folding area, and the fifth part includes a plurality of the grooves arranged at intervals, and there is a gap between the bottom surface of the groove and the side of the back panel away from the display panel.

4. The display module according to claim 3, characterized in that: The non-folding area includes a first non-folding area and a second non-folding area arranged on both sides of the folding area. Along the direction from the first non-folding area to the second non-folding area, the plurality of grooves are arranged at intervals, and along the direction perpendicular to the first non-folding area to the second non-folding area, the plurality of grooves extend from the left side of the display module to the right side of the display module.

5. The display module according to claim 1, characterized in that: The back plate includes a sixth part and a seventh part, the sixth part is arranged in the non-folding area, the seventh part is arranged in the folding area, and the seventh part includes a plurality of the grooves arranged at intervals, and the grooves penetrate the back plate.

6. The display module according to claim 5, characterized in that: The non-folding area includes a first non-folding area and a second non-folding area arranged on both sides of the folding area. Along the direction from the first non-folding area to the second non-folding area, multiple grooves are arranged at intervals, and along the direction perpendicular to the first non-folding area to the second non-folding area, multiple grooves are arranged at intervals.

7. The display module according to claim 6, characterized in that: Along the direction from the first non-folding area to the second non-folding area, the arrangement density of the grooves located in the edge area of ​​the folding area is less than the arrangement density of the grooves located in the middle area of ​​the folding area, and the grooves in two adjacent rows are staggered; along the direction perpendicular to the first non-folding area to the second non-folding area, the grooves located in the edge area of ​​the display module extend to the edge of the display module.

8. The display module according to any one of claims 1 to 7, characterized in that: The display module further includes an adhesive layer, which is disposed between the display panel and the back plate, and includes the flexible material.

9. The display module according to any one of claims 1 to 7, characterized in that: The display module further includes an adhesive layer and a filling layer, wherein the adhesive layer is disposed between the display panel and the back plate, and the filling layer includes the flexible material.

10. The display module according to any one of claims 1 to 7, characterized in that: The display module further includes a protective cover plate, which is arranged on a side of the display panel away from the back plate, and the protective cover plate includes a buffer groove, which is arranged corresponding to the digging groove.

11. The display module according to claim 10, characterized in that: The buffer groove is arranged on a side of the protection cover plate away from the display panel, the digging groove is arranged on a side of the back plate close to the display panel, and the width of the buffer groove is less than or equal to the width of the digging groove; Alternatively, the buffer groove is arranged on a side of the protection cover plate close to the display panel, the digging groove is arranged on a side of the back plate away from the display panel, and the width of the buffer groove is greater than or equal to the width of the digging groove.

12. A display device, characterized in that: Comprising a display module as described in any one of claims 1 to 11.

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