Display panel and display device

Abstract

The present application discloses a display panel and a display device, wherein the display panel includes a screen body and a stress strengthening layer, wherein the screen body includes a main body, a bonding part, and a bending part connected between the main body and the bonding part, wherein the bending part includes a first bending part and a second bending part; a stress optimization layer is arranged on one side of the first surface of the screen body, and the stress optimization layer includes a first stress optimization part and a second stress optimization part connected in sequence; wherein the orthographic projection of the first stress optimization part on the screen body covers the first bending part, the orthographic projection of the second stress optimization part on the screen body covers at least part of the second bending part, and the elastic modulus of the first stress optimization part is greater than the elastic modulus of the second stress optimization part. Through the above scheme, the stress of the bending part is reduced and the bending shape of the water drop is maintained.

Description

Technical Field

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

[0002] In order to increase the screen-to-body ratio and reduce the frame, the flexible display panel can be realized by bending the binding side of the screen (pad bending). At the same time, in order to achieve lightness and thinness and save space inside the flexible display terminal, the volume of the flexible display panel can be further reduced by changing the bending shape of the bad bending from "U-shaped" to "water drop shape" while keeping the bending radius unchanged.

[0003] The teardrop-shaped bending shape has an inwardly concave "bending neck". Due to the pad bending, the teardrop-shaped bending shape causes stress concentration in the "bending neck", making it difficult to ensure the teardrop-shaped bending shape. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a display panel and a display device to reduce the stress of the bending part and maintain the bending shape of the water drop.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: a display panel is provided, including a screen body and a stress optimization layer, the screen body including a first surface and a second surface arranged oppositely; the screen body also includes a main body, a bonding part, and a bending part connected between the main body and the bonding part, and the main body and the bonding part are arranged oppositely and at intervals; the bending part includes a first bending part and a second bending part, the first bending part is connected between the main body and the second bending part, and the first bending part is bent along the first surface toward the second surface; the second bending part is connected between the first bending part and the bonding part, and the second bending part is bent along the second surface toward the first surface; the stress optimization layer is arranged on one side of the first surface of the screen body, and the stress optimization layer includes a first stress optimization part and a second stress optimization part connected in sequence; wherein the orthographic projection of the first stress optimization part on the screen body covers the first bending part, the orthographic projection of the second stress optimization part on the screen body covers at least a part of the second bending part, and the elastic modulus of the first stress optimization part is greater than the elastic modulus of the second stress optimization part.

[0006] In order to solve the above technical problem, another technical solution adopted by the present application is: to provide a display device, including the display panel in any embodiment.

[0007] The beneficial effects of the present application are as follows: Different from the prior art, the stress optimization layer is arranged on the outer side of the bending part of the display panel and the display device of the present application, and the stress optimization layer is divided into a first stress optimization part and a second stress optimization part with different elastic moduli according to the bending shape of the water drop shape. Among them, the first stress optimization part with a larger elastic modulus corresponds to the first convex bending part. Since the elastic modulus of the first stress optimization part is larger, the neutral layer of the first bending part is close to the first surface of the screen body, so that the metal wiring layer on the screen body is close to the neutral layer, which reduces the degree of stretching or compression of the metal wiring layer due to bending, and reduces the influence of bending stress on the metal wiring on the surface of the screen body; the second stress optimization part with a smaller elastic modulus corresponds to the concave second bending part. Since the elastic modulus of the second stress optimization part is smaller, the equivalent modulus of the second bending part is reduced, which is conducive to the second bending part to form an inward bending shape, and at the same time, the stress of the second bending part is relieved, and the risk of debonding on the inside of the bonding part is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic structural diagram of an embodiment of a display panel of the present application;

[0009] Figure 2 It is a structural schematic diagram of an implementation method of a screen body of the present application;

[0010] Figure 3 is a schematic structural diagram of another embodiment of a display panel of the present application;

[0011] Figure 4 yes Figure 3 A schematic diagram of the structure when the display panel is expanded. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0013] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of a display panel according to an embodiment of the present application. The display panel comprises a screen body 1, a stress optimization layer 2 and a padding block 4.

[0014] Specifically, see Figure 2 , Figure 2It is a schematic diagram of the structure of an embodiment of the screen body 1 of the present application. The screen body 1 includes a first surface 1a and a second surface 1b that are arranged opposite to each other; the screen body 1 also includes a main body 11, a bonding portion 13, and a bending portion 12 connected between the main body 11 and the bonding portion 13, and the main body 11 and the bonding portion 13 are arranged opposite to each other and at intervals; the bending portion 12 includes a first bending portion 121 and a second bending portion 122, the first bending portion 121 is connected between the main body 11 and the second bending portion 122, and the first bending portion 121 is bent along the first surface 1a toward the second surface 1b; the second bending portion 122 is connected between the first bending portion 121 and the bonding portion 13, and the second bending portion 122 is bent along the second surface 1b toward the first surface 1a;

[0015] like Figure 1 As shown, the stress optimization layer 2 is arranged on one side of the first surface 1a of the screen body 1 (i.e., the outer side of the screen body 1 in the figure), and the stress optimization layer 2 includes a first stress optimization portion 21 and a second stress optimization portion 22 connected in sequence; wherein, the orthographic projection of the first stress optimization portion 21 on the screen body 1 covers the first bending portion 121, and the orthographic projection of the second stress optimization portion 22 on the screen body 1 covers at least part of the second bending portion 122, and the elastic modulus of the first stress optimization portion 21 is greater than the elastic modulus of the second stress optimization portion 22. Optionally, the second stress optimization portion 22 covers the entire second bending portion 122, reducing the possibility of metal wiring fracture at the position of the second bending portion 122. Optionally, the first stress optimization portion 21 also covers part of the main body 11.

[0016] The bending portion 12 of the display panel of the present application is a teardrop-shaped bending shape, that is, the center of the arc of the first bending portion 121 connected to the main body 11 is located on the inner side of the screen body 1, and the center of the arc of the second bending portion 122 connected to the bonding portion 13 is located on the outer side of the screen body 1.

[0017] The present application sets a stress optimization layer 2 on the outside of the bending portion 12, and the stress optimization layer 2 is divided into a first stress optimization portion 21 and a second stress optimization portion 22 with different elastic moduli according to the teardrop-shaped bending shape. Among them, the first stress optimization portion 21 with a larger elastic modulus corresponds to the convex first bending portion 121, and the first stress optimization portion 21 is attached to the convex surface of the first bending portion 121 and covers the entire first bending portion 121. Since the elastic modulus of the first stress optimization portion 21 is relatively large, the neutral layer of the first bending portion 121 attached thereto is close to the first surface 1a of the screen body 1, so that the metal wiring layer on the screen body 1 is close to the neutral layer, which reduces the degree of stretching or compression of the metal wiring layer due to bending, and reduces the bending stress on the metal on the surface of the screen body. The second stress optimization portion 22 with a smaller elastic modulus corresponds to the concave second bending portion 122, and the second stress optimization portion 22 is attached to the concave surface of the second bending portion 122 and covers at least part of the second bending portion 122. Since the elastic modulus of the second stress optimization portion 22 is smaller, the equivalent modulus of the second bending portion 122 attached thereto is reduced, which is beneficial for the second bending portion 122 to form an inwardly bent shape, while alleviating the stress of the second bending portion 122 and reducing the risk of the inner side of the bonding portion 13 being detached from other structures.

[0018] Optionally, in this embodiment, the thickness of the first stress optimization portion 21 is the same as the thickness of the second stress optimization portion 22. In other embodiments, the thickness of the first stress optimization portion 21 may be greater than the thickness of the second stress optimization portion 22 to increase the protection of the metal trace at the first bending portion 121.

[0019] The first stress optimization portion 21 and the second stress optimization portion 22 may have various implementations. Figure 3 , Figure 3 is a schematic structural diagram of another embodiment of the display panel of the present application. In this embodiment, the stress optimization layer 2 includes a first stress optimization layer 2a and a second stress optimization layer 2b which are stacked. The elastic modulus of the first stress optimization layer 2a is smaller than the elastic modulus of the second stress optimization layer 2b. Figure 4 As shown, Figure 4 yes Figure 3 A structural schematic diagram of a display panel when it is unfolded, the first stress optimization layer 2a includes a first sub-stress optimization portion 2a1 and a second sub-stress optimization portion 2a2 connected in sequence, the orthographic projection of the first sub-stress optimization portion 2a1 in the second stress optimization layer 2b is located inside the second stress optimization layer 2b, the orthographic projection of the second sub-stress optimization portion 2a2 in the second stress optimization layer 2b is located outside the second stress optimization layer 2b, the first sub-stress optimization portion 2a1 and the second stress optimization layer 2b form a first stress optimization portion 21, and the second sub-stress optimization portion 2a2 forms a second stress optimization portion 22.

[0020] The present embodiment provides two stress optimization layers with different lengths, inner and outer layers. On the one hand, since the materials of the single-layer stress optimization layers are the same, the elastic modulus of the single-layer stress optimization layers along their length direction is the same, and the segmented setting of the elastic modulus in the length direction can be achieved by using the first stress optimization layer 2a and the second stress optimization layer 2b of different materials, which is convenient for preparation. On the other hand, the first stress optimization portion 21 formed in this way is an integration of the first sub-stress optimization portion 2a1 and the second stress optimization layer 2b, and its thickness and elastic modulus are both greater than those of the second stress optimization portion 22 with only a single layer, which further protects the metal routing of the first bending portion 121 while alleviating the stress of the second bending portion 122.

[0021] It should be noted that the present application does not limit the number of stress optimization layers, which can be increased or decreased according to actual conditions.

[0022] Optionally, continue to Figure 3 and Figure 4 In this embodiment, the second stress optimization layer 2b is arranged on the side of the first stress optimization layer 2a away from the first surface 1a. The length of the second stress optimization layer 2b of the outer layer is less than the length of the first stress optimization layer 2a of the inner layer, which facilitates the preparation of the stress optimization layers from the inside to the outside, and the two layers have a high degree of fit. Of course, in other embodiments, the second stress optimization layer 2b can also be arranged on the side of the first stress optimization layer 2a facing the first surface 1a, that is, arranged on the inner side of the first stress optimization layer 2a.

[0023] Specifically, the elastic modulus of the first stress optimization layer 2a is 10-150MPa, for example, 10MPa, 50MPa, 100MPa, and the elastic modulus of the second stress optimization layer 2b is 400-600MPa, for example, 400MPa, 450MPa, 500MPa, 550MPa, 600MPa.

[0024] Optionally, in this embodiment, the thickness of the first stress optimization layer 2a is less than the thickness of the second stress optimization layer 2b; specifically, the thickness ratio of the first stress optimization layer 2a to the second stress optimization layer 2b is 3 / 7 to 2 / 3.

[0025] Optionally, continue to Figure 3 The thickness of the second stress optimization layer 2b at one end close to the second stress optimization portion 22 can be gradually thinned to reduce the thickness mutation at the junction of the first stress optimization portion 21 and the second stress optimization portion 22, so that the neutral layer at the junction can transition slowly, further reducing the probability of the metal routing layer breaking.

[0026] Continue reading Figure 4 , the thickness D0 of the first stress optimization portion 21 is 50-150 μm, for example, 50 μm, 100 μm, or 150 μm. Figure 1The display panel further includes a support film disposed on one side of the second surface 1b of the screen body (not shown), and the support film includes a first support film 31 and a second support film 32 disposed at intervals; wherein, the orthographic projection of the first support film 31 on the screen body covers the main body 11, and has an overlapping area with the orthographic projection of the first stress optimization part 21 on the screen body; the orthographic projection of the second support film 32 on the screen body covers the bonding part 13 and at least part of the second bending part 122, and is located outside the orthographic projection of the first stress optimization part 21 on the screen body 1. The first support film 31 and the second support film 32 are both used to maintain the water drop bending shape of the bending part 12, and the orthographic projection of the second support film 32 on the screen body does not have an overlapping area with the orthographic projection of the first stress optimization part 21 on the screen body, thereby avoiding the excessive thickness of the display panel corresponding to the second bending part 122, reducing the stress of the second bending part 122, and increasing the probability that the second bending part 122 can be smoothly concave to form a water drop shape.

[0027] Optionally, the orthographic projection of the first edge 32a of the second supporting film 32 toward the second stress optimization portion 22 on the screen body coincides with the orthographic projection of the second edge 21a of the first stress optimization portion 21 toward the second stress optimization portion 22 on the screen body. Optionally, the orthographic projection of the second edge 21a on the screen body coincides with the boundary line of the first bending portion 121 and the second bending portion 122. The probability of sudden stress change in the bending portion 12 is reduced, and the probability that the bending portion 12 can be smoothly bent into a water drop shape is increased.

[0028] Optionally, continue to Figure 1 The display panel also includes a padding block 4, which includes a third surface 4a and a fourth surface 4b arranged opposite to each other, the third surface 4a is fixedly connected to the main body 11, and the fourth surface 4b is fixedly connected to the bonding portion 13; the padding block 4 is arranged between the first support film 31 and the second support film 32, the third surface 4a is arranged opposite to the first support film 31, and a first adhesive layer 41 is arranged between the first support film 31 and the third surface 4a; the fourth surface 4b is arranged opposite to the second support film 32, and a second adhesive layer 42 is arranged between the second support film 32 and the fourth surface 4b, and the orthographic projection of the second adhesive layer 42 on the screen body (not shown) is located outside the orthographic projection of the second stress optimization portion 22 on the screen body. The radius of the bending portion 12 can be achieved by adjusting the thickness of the padding block 4. The above arrangement avoids the second support film 32 from generating excessive tension on the second bending portion 122, resulting in the inability to form a water drop shape or causing damage to the metal wiring. Optionally, the first adhesive layer 41 covers the third surface 4 a to enhance the adhesion between the first supporting film 31 and the raising block 4 .

[0029] Specifically, the material of the stress optimization layer 2 is one or more of acrylic acid, epoxy resin, polyethylene terephthalate, polyimide and polysiloxane. The stress optimization layer 2 can be an adhesive such as acrylic acid and epoxy resin, which is convenient for lamination and coating, or an organic polymer material such as polyethylene terephthalate PET, polyimide PI, or an organic-inorganic combination such as polysiloxane, which can be cured by ultraviolet light UV irradiation.

[0030] The present application also includes a display device, including the display panel in any of the above embodiments. The display device can be an electronic display product such as a mobile phone, a tablet computer, a smart watch or other wearable device.

[0031] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: include: A screen body, comprising a first surface and a second surface arranged opposite to each other; the screen body further comprises a main body, a bonding portion, and a bending portion connected between the main body and the bonding portion, wherein the main body and the bonding portion are arranged opposite to each other and at intervals; the bending portion comprises a first bending portion and a second bending portion, wherein the first bending portion is connected between the main body and the second bending portion, and the first bending portion is bent along the first surface toward the second surface; the second bending portion is connected between the first bending portion and the bonding portion, and the second bending portion is bent along the second surface toward the first surface; A stress optimization layer is arranged on one side of the first surface of the screen body, and the stress optimization layer includes a first stress optimization portion and a second stress optimization portion connected in sequence; wherein the orthographic projection of the first stress optimization portion on the screen body covers the first bending portion, the orthographic projection of the second stress optimization portion on the screen body covers at least a portion of the second bending portion, and the elastic modulus of the first stress optimization portion is greater than the elastic modulus of the second stress optimization portion; The stress optimization layer includes a first stress optimization layer and a second stress optimization layer which are stacked, and the elastic modulus of the first stress optimization layer is smaller than that of the second stress optimization layer; wherein the first stress optimization layer includes a first sub-stress optimization portion and a second sub-stress optimization portion which are sequentially connected, the orthographic projection of the first sub-stress optimization portion on the second stress optimization layer is located inside the second stress optimization layer, the orthographic projection of the second sub-stress optimization portion on the second stress optimization layer is located outside the second stress optimization layer, the first sub-stress optimization portion and the second stress optimization layer form the first stress optimization portion, and the second sub-stress optimization portion forms the second stress optimization portion.

2. The display panel according to claim 1, characterized in that: The second stress optimization layer is disposed on a side of the first stress optimization layer facing away from the first surface.

3. The display panel according to claim 1, characterized in that: The elastic modulus of the first stress optimization layer is 10-150 MPa, and the elastic modulus of the second stress optimization layer is 400-600 MPa.

4. The display panel according to claim 1, characterized in that: The thickness of the first stress optimization layer is smaller than the thickness of the second stress optimization layer.

5. The display panel according to claim 4, characterized in that: The thickness ratio of the first stress optimization layer to the second stress optimization layer is 3 / 7 to 2 / 3.

6. The display panel according to claim 1, characterized in that: The thickness of the first stress optimization portion is 50-150 μm.

7. The display panel according to claim 6, characterized in that: The thickness of the second stress optimization portion is smaller than the thickness of the first stress optimization portion.

8. The display panel according to claim 1, characterized in that: The display panel further comprises a support film disposed on one side of the second surface of the screen body, wherein the support film comprises a first support film and a second support film disposed at intervals; wherein The orthographic projection of the first supporting film on the screen body covers the main body and has an overlapping area with the orthographic projection of the first stress optimization part on the screen body; the orthographic projection of the second supporting film on the screen body covers the bonding part and at least part of the second bending part, and is located outside the orthographic projection of the first stress optimization part on the screen body.

9. The display panel according to claim 8, characterized in that: An orthographic projection of a first edge of the second supporting film facing the second stress optimization portion on the screen body coincides with an orthographic projection of a second edge of the first stress optimization portion facing the second stress optimization portion on the screen body.

10. The display panel according to claim 8, characterized in that: The display panel further includes: The raising block comprises a third surface and a fourth surface which are arranged opposite to each other, the third surface is fixedly connected to the main body, and the fourth surface is fixedly connected to the bonding part; the raising block is arranged between the first supporting film and the second supporting film, the third surface is arranged opposite to the first supporting film, and a first adhesive layer is arranged between the first supporting film and the third surface; the fourth surface is arranged opposite to the second supporting film, and a second adhesive layer is arranged between the second supporting film and the fourth surface, and the orthographic projection of the second adhesive layer on the screen body is located outside the orthographic projection of the second stress optimization part on the screen body.

11. The display panel according to claim 1, characterized in that: The material of the stress optimization layer is one or more of acrylic acid, epoxy resin, polyethylene terephthalate, polyimide and polysiloxane.

12. A display device, characterized in that: The invention comprises the display panel described in any one of claims 1 to 11.

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