Bendable display module and display device

Abstract

The embodiment of the invention provides a bendable display module and a display device, the bendable display module comprises a flexible display panel and a stress release layer, and the stress release layer is located on at least one side of the flexible display panel; the bendable display module comprises a bendable area, and the stress release layer is located in the bendable area. Wherein the stress release layer comprises a plurality of arc-shaped notches. In the bending process of the bendable display module, the stress generated by bending can be released through the arc-shaped notches, the stress of the bendable area can be relieved, stress concentration is avoided, the problem of film layer stripping in the bending process can be solved, and the service life of the bendable display module is prolonged.

Description

Technical Field

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

[0002] Flexible display panels have been increasingly used due to their bendability, especially the folding applications of flexible display panels, which have received increasing attention and recognition from users.

[0003] In the prior art, foldable display devices include multiple layers of substrates and adhesives, but because the properties of the materials of each layer are usually different, the stress generated during the bending process can easily cause the film layers of different materials to be misaligned, resulting in warping or even peeling of the film layers. Therefore, a solution is urgently needed. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a bendable display module and a display device to solve the above problems.

[0005] In a first aspect, an embodiment of the present application provides a bendable display module, comprising a flexible display panel and a stress release layer, wherein the stress release layer is located on at least one side of the flexible display panel; the bendable display module comprises a bendable area, wherein the stress release layer is located in the bendable area; wherein the stress release layer comprises a plurality of arc-shaped cutouts.

[0006] In an implementation of the first aspect, in the stress release layer, a plurality of arc-shaped cutouts form a fish scale shape.

[0007] In an implementation of the first aspect, in the stress release layer, the protrusion directions of the arc-shaped cutouts are the same.

[0008] In an implementation of the first aspect, the plurality of arcuate cuts include a first arcuate cut and a second arcuate cut, and the first arcuate cut and the second arcuate cut have different protrusion directions.

[0009] In an implementation of the first aspect, the protrusion directions of the first arc-shaped incision and the second arc-shaped incision are opposite.

[0010] In an implementation of the first aspect, the bendable display module also includes a first flat area and a second flat area connected to the bendable area, and the first flat area and the second flat area are located on opposite sides of the bendable area; the bendable area includes a first area and a second area, and the first area is close to the first flat area relative to the second area; wherein the first arc-shaped cut is located in the first area, and the second arc-shaped cut is located in the second area.

[0011] In an implementation of the first aspect, the first arc-shaped cutout protrudes toward the first flat area, and the second arc-shaped cutout protrudes toward the second flat area.

[0012] In an implementation of the first aspect, the stress release layer includes a first stress release layer and a second stress release layer, the first stress release layer is located on one side of the light emitting surface of the flexible display panel, and the second stress release layer is located on one side of the backlight surface of the flexible display panel.

[0013] In an implementation of the first aspect, a protruding direction of the arc-shaped cutout in the first stress release layer is the same as a protruding direction of the arc-shaped cutout in the second stress release layer.

[0014] In an implementation of the first aspect, a protruding direction of the arc-shaped cutout in the first stress release layer is different from a protruding direction of the cutout in the second stress release layer.

[0015] In an implementation of the first aspect, the bendable display module includes an adhesive layer, one side of the adhesive layer is bonded to the flexible display panel, and the other side of the adhesive layer is bonded to the stress release layer.

[0016] In a second aspect, an embodiment of the present application provides a display device, comprising the bendable display module provided in the first aspect.

[0017] In an embodiment of the present application, a stress release layer including a plurality of arc-shaped cutouts is provided in the bendable area. During the bending process of the bendable display module, the stress generated by the bending can be released through the arc-shaped cutouts, which is beneficial to reducing the stress in the bendable area and avoiding stress concentration, thereby helping to improve the problem of film peeling during the bending process and increasing the service life of the bendable display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic plan view of a bendable display module provided in an embodiment of the present application; Figure 2 for Figure 1 A schematic cross-sectional view along the AA' tangent line; Figure 3 for Figure 1 Another cross-sectional schematic diagram along the AA' tangent line; Figure 4 A schematic plan view of a stress release layer provided in an embodiment of the present application; Figure 5 for Figure 1 Another cross-sectional schematic diagram along the AA' tangent line; Figure 6 A schematic plan view of another stress release layer provided in an embodiment of the present application; Figure 7 for Figure 1 Another cross-sectional schematic diagram along the AA' tangent line; Figure 8 A schematic diagram of a comparison between a first stress release layer and a second stress release layer provided in an embodiment of the present application; Fig. 9 A schematic diagram showing a comparison between a first stress release layer and a second stress release layer provided in another embodiment of the present application; Fig.10 A schematic diagram showing a comparison between a first stress release layer and a second stress release layer provided in another embodiment of the present application; Fig.11 A schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0021] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0023] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0024] Figure 1 A schematic plan view of a bendable display module provided in an embodiment of the present application, Figure 2 for Figure 1 A schematic cross-sectional view along the AA' tangent line. Figure 3 for Figure 1 Another cross-sectional diagram along the AA' tangent line, Figure 4 A schematic plan view of a stress release layer provided in an embodiment of the present application.

[0025] The present application embodiment provides a bendable display module 10, combined with Figure 1 and Figure 2 As shown, the bendable display module 10 includes a flexible display panel 01 and a stress release layer 02, wherein the stress release layer 02 is stacked with the flexible display panel 01 and is located on at least one side of the flexible display panel 01. The stress release layer 02 is used to release the stress generated by the bendable display module 10 during the bending process.

[0026] For example, Figure 2 As shown, the stress release layer 02 is located on one side of the light-emitting surface of the flexible display panel 01. Since a heat dissipation structure such as copper foil is usually provided on one side of the backlight surface of the flexible display panel 01, the stress release layer 02 is provided on one side of the light-emitting surface of the flexible display panel 01, which is beneficial to avoid the stress release layer 02 affecting the heat dissipation rate of the flexible display panel 01 while releasing the bending stress.

[0027] For example, Figure 3 As shown, the stress release layer 02 is located on one side of the backlight surface of the flexible display panel 01. Based on this arrangement, while releasing the bending stress, it is beneficial to increase the structural diversity of the bendable display module 10.

[0028] In addition, a stress release layer 02 may be provided on both the light emitting surface and the backlight surface of the flexible display panel 01 to improve the stress release effect of the bendable display module 10 during the bending process.

[0029] It should be noted that if Figure 2 and Figure 3 As shown, the bendable display module 10 further includes an upper film layer 03 located on the light-emitting side of the flexible display panel 01, and a lower film layer 04 located on the backlight side of the flexible display panel 01. Exemplarily, the upper film layer 03 may include film layers such as a glue layer, a polarizer, and a glass cover plate, and the lower film layer 04 may include film layers such as a glue layer, a copper foil, and a foam.

[0030] Please continue to refer to Figure 1 The bendable display module 10 includes a bendable area 11, a first flat area 12, and a second flat area 13. The first flat area 12 and the second flat area 13 are located on opposite sides of the bendable area 11 and are both connected to the bendable area 11. The bendable display module 10 can be bent and flattened by changing the bending state of the bendable area 11.

[0031] Among them, combined Figure 2 and Figure 4As shown, at least a portion of the stress release layer 02 is located in the bendable area 11 , and the stress release layer 02 includes a plurality of arc-shaped cutouts 21 .

[0032] It is understandable that during the bending process of the bendable display module 10 , the stress generated by the bending is mainly concentrated in the bendable area 11 .

[0033] In the embodiment of the present application, a stress release layer 02 including a plurality of arc-shaped cutouts 21 is provided in the bendable area 11. Then, during the bending process of the bendable display module 10, the stress generated by the bending can be released through the arc-shaped cutouts 21, which is beneficial to reducing the stress in the bendable area 11 and avoiding stress concentration, thereby helping to improve the problem of film peeling during the bending process and increasing the service life of the bendable display module 10.

[0034] Optional, such as Figure 5 As shown, Figure 5 for Figure 1 In another cross-sectional schematic diagram along the AA' tangent line, the arc-shaped cutout 21 penetrates the stress release layer 02. Based on this arrangement, it is beneficial to increase the stress release effect of the arc-shaped cutout 21.

[0035] Optional, please continue to refer to Figure 4 In the stress release layer 02, a plurality of arcuate cutouts 21 form a fish scale shape. Based on this arrangement, the arcuate cutouts 21 in the stress release layer 02 can be distributed more evenly, and the fish scale-shaped arcuate cutouts 21 can release the stress generated by bending more evenly, which is beneficial to further avoid bending stress concentration.

[0036] In one embodiment of the present application, Figure 4 As shown, in the stress release layer 02, the protruding directions of the arc-shaped cutouts 21 are the same.

[0037] Exemplary, combined Figure 1 and Figure 4 As shown, the bendable area 11 includes a virtual bending axis 110 and a first area 111 and a second area 112 located on opposite sides of the virtual bending axis 110. The first area 111 is located on the side of the virtual bending axis 110 close to the first flat area 12, and the second area 112 is located on the side of the virtual bending axis 110 close to the second flat area 13. In the same stress release layer 02, each arc-shaped cutout 21 protrudes toward the first flat area 12.

[0038] Based on this configuration, while releasing the bending stress, the complexity of the arc-shaped cutout 21 can be reduced, which is beneficial to simplifying the preparation process of the arc-shaped cutout 21 in the stress release layer 02 and reducing the preparation cost.

[0039] In addition, while setting the arc-shaped cutouts 21 to have the same protruding direction, the film position of the stress release layer 02 can also be set according to the bending direction of the bendable display module 01 to better release the bending stress.

[0040] For example, when the bendable display module 10 is bent, the light-emitting surface of the flexible display panel 01 is folded, that is, when the bendable display module 01 is bent “inward”, the stress release layer 02 can be arranged on the backlight side of the flexible display panel 01 .

[0041] If the bendable display module 10 is bent, the backlight surface of the flexible display panel 01 will be folded, that is, when the bendable display module 01 is bent "outward", the stress release layer 02 can be arranged on the light emitting surface side of the flexible display panel 01.

[0042] Figure 6 A schematic plan view of another stress release layer provided in an embodiment of the present application.

[0043] In one embodiment of the present application, Figure 6 As shown, the multiple arc-shaped cutouts 21 of the same stress release layer 02 include a first arc-shaped cutout 211 and a second arc-shaped cutout 212 , and the protrusion directions of the first arc-shaped cutout 211 and the second arc-shaped cutout 212 are different.

[0044] Based on this setting method, it is beneficial to flexibly set the protruding directions of the first arc-shaped cut 211 and the second arc-shaped cut 212 according to the direction of the bending stress, so as to utilize the first arc-shaped cut 211 and the second arc-shaped cut 212 to release the stress generated by bending in a targeted manner, so as to improve the stress release effect of the stress release layer 02.

[0045] Optional, such as Figure 6 As shown, the protrusion directions of the first arc-shaped cutout 211 and the second arc-shaped cutout 212 are opposite to each other. This is beneficial for effectively releasing stress on both sides of the virtual bending axis 110, thereby improving the stress release effect.

[0046] Combination Figure 1 and Figure 5 As shown, in one embodiment of the present application, the bendable display module 10 includes a first flat area 12 and a second flat area 13 connected to the bendable area 11 , and the first flat area 12 and the second flat area 13 are located on opposite sides of the bendable area 11 .

[0047] The bendable area 11 includes a first area 111 and a second area 112 . The first area 111 is closer to the first flat area 12 than the second area 112 . The second area 112 is closer to the second flat area 13 than the first area 111 .

[0048] For example, Figure 1 As shown, the bendable area 11 includes a virtual bending axis 110 , a first area 111 is located on a side of the virtual bending axis 110 close to the first flat area 12 , and a second area 112 is located on a side of the virtual bending axis 110 close to the second flat area 13 .

[0049] The first arc-shaped cutout 211 is located in the first area 111 , and the second arc-shaped cutout 212 is located in the second area 112 .

[0050] It is understandable that when the bendable display module 10 is bent, in the bendable area 11 , the bending stress in the first region 111 close to the first flat region 12 and the bending stress in the second region 112 close to the second flat region 13 are usually in different directions.

[0051] In the embodiment of the present application, the first arc-shaped cut 211 is located in the first area 111 close to the first flat area 12, and the second arc-shaped cut 212 is located in the second area 112 close to the second flat area 13. The protruding directions of the first arc-shaped cut 211 and the second arc-shaped cut 212 can be flexibly set so that the protruding direction of the first arc-shaped cut 211 matches the stress release in the first area 111, and the protruding direction of the second arc-shaped cut 212 matches the stress release in the second area 112. This is beneficial for fully releasing the stress in the bendable area 11 by utilizing the first arc-shaped cut 211 and the second arc-shaped cut 212 with different protruding directions, thereby improving the release effect of the stress release layer 02 on the bending stress.

[0052] Optional, combined Figure 1 and Figure 6 As shown, the first arc-shaped cutout 211 protrudes toward the first flat area 12, and the second arc-shaped cutout 212 protrudes toward the second flat area 13. At this time, taking the case where the stress release layer 02 is disposed on the light-emitting surface side of the flexible display panel 01 as an example, when the light-emitting surface of the flexible display panel 01 is folded, or when the backlight surface of the flexible display panel 01 is folded, the first arc-shaped cutout 211 and the second arc-shaped cutout 212 can both effectively release the bending stress.

[0053] certainly, Figure 6 The stress release layer 02 shown can also be arranged on the backlight side of the flexible display panel 01 .

[0054] Figure 7 for Figure 1 Another cross-sectional schematic diagram along the AA' tangent line.

[0055] In one embodiment of the present application, Figure 1 and Figure 7As shown, the stress release layer 02 includes a first stress release layer 201 and a second stress release layer 202 . The first stress release layer 201 is located on the light emitting side of the flexible display panel 01 , and the second stress release layer 202 is located on the backlight side of the flexible display panel 01 .

[0056] That is to say, when the bendable display module 10 is in a flattened state, stress release layers are disposed on opposite sides of the flexible display panel 01 along a thickness direction perpendicular to the plane where the bendable display module 10 is located.

[0057] From the above analysis, it can be seen that when the light-emitting surface of the flexible display panel 01 is folded, the stress release layer 02 located on the backlight side of the flexible display panel 01 is conducive to better release of bending stress. When the backlight side of the flexible display panel 01 is folded, the stress release layer 02 located on the light-emitting side of the flexible display panel 01 is conducive to better release of bending stress.

[0058] Therefore, in the embodiment of the present application, a first stress release layer 201 is arranged on the side of the light-emitting surface of the flexible display panel 01, and a second stress release layer 202 is arranged on the side of the backlight surface of the flexible display panel 01. When the light-emitting surface of the flexible display panel 01 is folded, the second stress release layer 202 can ensure the effective release of the bending stress, and when the backlight surface of the flexible display panel 01 is folded, the first stress release layer 201 can ensure the effective release of the bending stress.

[0059] The embodiment of the present application is conducive to effectively releasing bending stress and avoiding stress concentration when the bendable display module 10 is bent "inward" or "outward".

[0060] Moreover, when the bendable display module 10 is bent “inward” or “outward”, the first stress release layer 201 and the second stress release layer 202 can also release the bending stress together, which is beneficial to improve the release effect of the bending stress.

[0061] Optional, such as Figure 8 As shown, Figure 8 A schematic diagram of a comparison between a first stress release layer and a second stress release layer provided in an embodiment of the present application, in the first stress release layer 201, the convex directions of the arc-shaped cutouts 21 are the same; in the second stress release layer 202, the convex directions of the arc-shaped cutouts 21 are the same. The convex directions of the arc-shaped cutouts 21 in the first stress release layer 201 are the same as the convex directions of the arc-shaped cutouts 21 in the second stress release layer 202.

[0062] Exemplary, combined Figure 1 and Figure 8 As shown, in the first stress release layer 201 and the second stress release layer 202 , the arc-shaped cutouts 21 both protrude toward the first flat area 12 .

[0063] Based on this configuration, while improving the effect of releasing bending stress when the bendable display module 10 is bent “inward” or “outward”, the preparation process of the first stress release layer 201 and the second stress release layer 202 can be simplified, thereby reducing the difficulty of preparing the bendable display module 10.

[0064] Optional, such as Fig. 9 As shown, Fig. 9 A schematic diagram of another comparison of a first stress release layer and a second stress release layer provided in an embodiment of the present application, in the first stress release layer 201, the convex directions of the arc-shaped cutouts 21 are the same; in the second stress release layer 202, the convex directions of the arc-shaped cutouts 21 are the same. The convex directions of the arc-shaped cutouts 21 in the first stress release layer 201 are different from the convex directions of the arc-shaped cutouts 21 in the second stress release layer 202.

[0065] Exemplary, combined Figure 1 and Fig. 9 As shown, in the first stress release layer 201 , the arc-shaped cutouts 21 all protrude toward the first flat area 12 . In the second stress release layer 202 , the arc-shaped cutouts 22 all protrude toward the second flat area 13 .

[0066] Based on this configuration, while improving the effect of releasing bending stress when the bendable display module 10 is bent “inward” or “outward”, it is also beneficial to increase the structural diversity of the bendable display module 10 .

[0067] Optional, combined Figure 1 and Fig.10 As shown, Fig.10 A comparative schematic diagram of another first stress release layer and a second stress release layer provided in an embodiment of the present application, the bendable display module 10 includes a first flat area 12 and a second flat area 13 connected to the bendable area 11, and the first flat area 12 and the second flat area 13 are located on opposite sides of the bendable area 11.

[0068] The bendable area 11 includes a virtual bending axis 110 , a first region 111 and a second region 112 . The first region 111 is located on a side of the virtual bending axis 110 close to the first flat region 12 , and the second region 112 is located on a side of the virtual bending axis 110 close to the second flat region 13 .

[0069] The plurality of arc-shaped cutouts 21 include a first arc-shaped cutout 211 and a second arc-shaped cutout 212 . The first arc-shaped cutout 211 protrudes toward the first flat area 12 , and the second arc-shaped cutout 212 protrudes toward the second flat area 13 .

[0070] In the first stress release layer 201 and the second stress release layer 202 , the first arc-shaped cutouts 211 are both located in the first region 111 , and the second arc-shaped cutouts 212 are both located in the second region 112 . Based on this setting, when the bendable display module 10 is bent "inward" or "outward", the first arc-shaped cutout 211 in the first stress release layer 201 and the second stress release layer 202 can effectively release the stress in the first area 111, and the second arc-shaped cutout 212 in the first stress release layer 201 and the second stress release layer 202 can effectively release the stress in the second area 112, which is beneficial to achieve targeted release of the stress generated by bending and improve the effect of stress release in the bending area 11.

[0071] In one embodiment of the present application, Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, the bendable display module 10 further includes an adhesive layer 05 , one side of the adhesive layer 05 is bonded to the flexible display panel 01 , and the other side of the adhesive layer 05 is bonded to the stress release layer 02 .

[0072] That is to say, the stress release layer 02 can be directly bonded to the flexible display panel 01 through the adhesive layer 05 .

[0073] The inventor of the present application has found through research that during the bending process of the bendable display module 10, the film layer bonded to the flexible display panel 01 is more likely to warp and fall off. The embodiment of the present application provides a stress release layer 02 bonded to the flexible display panel 01, which is conducive to quickly releasing the bending stress through the stress release layer 02, thereby facilitating the bonding reliability of each film layer in the bendable display module 10 and prolonging the service life.

[0074] Fig.11 A schematic diagram of a display device provided in an embodiment of the present application.

[0075] The present application embodiment provides a display device 20, such as Fig.11 As shown, the display device 20 includes the bendable display module 10 provided in the above embodiment. The display device 20 provided in the embodiment of the present application is a bendable display device. Exemplarily, the display device 20 is an electronic device such as a mobile phone, a tablet computer, a wearable display, etc., which is not specifically limited in the present application.

[0076] In the display device 20, a stress release layer 02 including a plurality of arc-shaped cutouts 21 is provided in the bendable area 11. During the bending process of the bendable display module 10, the stress generated by the bending can be released through the arc-shaped cutouts 21, which is beneficial to reducing the stress in the bendable area 11 and avoiding stress concentration, thereby helping to improve the problem of film peeling during the bending process and increasing the service life of the display device 20.

[0077] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A bendable display module, characterized in that: It comprises a flexible display panel and a stress release layer, wherein the stress release layer is located on at least one side of the flexible display panel; The bendable display module comprises a bendable area, and at least a portion of the stress release layer is located in the bendable area; Wherein, the stress release layer includes a plurality of arc-shaped cutouts.

2. The bendable display module according to claim 1, characterized in that: In the stress release layer, the plurality of arc-shaped cutouts form a fish scale shape.

3. The bendable display module according to claim 1, characterized in that: In the stress release layer, the protrusion directions of the arc-shaped cutouts are the same.

4. The bendable display module according to claim 1, characterized in that: The plurality of arc-shaped cuts include a first arc-shaped cut and a second arc-shaped cut, and the protrusion directions of the first arc-shaped cut and the second arc-shaped cut are different.

5. The bendable display module according to claim 4, characterized in that: The protrusion directions of the first arc-shaped incision and the second arc-shaped incision are opposite.

6. The bendable display module according to claim 4, characterized in that: The bendable display module further includes a first flat area and a second flat area connected to the bendable area, wherein the first flat area and the second flat area are located at opposite sides of the bendable area; The bendable area includes a first area and a second area, wherein the first area is closer to the first flat area than the second area; Wherein, the first arc-shaped incision is located in the first area, and the second arc-shaped incision is located in the second area.

7. The bendable display module according to claim 6, characterized in that: The first arc-shaped cutout protrudes toward the first flat area, and the second arc-shaped cutout protrudes toward the second flat area.

8. The bendable display module according to claim 1, characterized in that: The stress release layer includes a first stress release layer and a second stress release layer, the first stress release layer is located on a side of the light emitting surface of the flexible display panel, and the second stress release layer is located on a side of the backlight surface of the flexible display panel.

9. The bendable display module according to claim 8, characterized in that: The protruding direction of the arc-shaped cutout in the first stress release layer is the same as the protruding direction of the arc-shaped cutout in the second stress release layer.

10. The bendable display module according to claim 8, characterized in that: A protruding direction of the arc-shaped cutout in the first stress release layer is different from a protruding direction of the arc-shaped cutout in the second stress release layer.

11. The bendable display module according to claim 1, characterized in that: The bendable display module comprises an adhesive layer, one side of the adhesive layer is bonded to the flexible display panel, and the other side of the adhesive layer is bonded to the stress release layer.

12. A display device, characterized in that: It comprises a bendable display module as described in any one of claims 1-11.

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