Display panel and display device

Abstract

This invention discloses a display panel and a display device. The display panel includes a flat display area and a curved display area adjacent to the flat display area. The curved display area includes multiple side curved surface sub-areas disposed around the periphery of the flat display area and corner curved surface sub-areas connecting adjacent side curved surface sub-areas. The display panel also includes a panel body, a back plate, and a polarizer. The back plate is disposed on one side of the panel body; the polarizer is disposed on the side of the panel body away from the back plate. At least in the corner curved surface sub-area, the thickness of the back plate is greater than the thickness of the polarizer. This invention can increase the stress threshold for wrinkles in the display panel by increasing the thickness of the back plate in the corner curved surface sub-area, thereby reducing the probability of wrinkles in the display panel and improving the yield rate and display effect in the corner curved surface sub-area.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and a display device having the display panel. Background Technology

[0002] With the changing aesthetic standards and the development of mobile terminal products, people are gradually pursuing mobile phone terminals with rounded curves. As a result, many curved screen terminals have appeared on the market. Currently, most multi-curved screens have curved sides, i.e., double-curved screens. While there are many double-curved screen products and the technology is becoming increasingly sophisticated, quad-curved screens are gradually becoming a market hotspot due to their more beautiful curves, differentiated appearance, and borderless design when viewed from the front. Quad-curved screens are also one of the inevitable trends in the development of mobile phone terminals.

[0003] In a quad-curved screen, wrinkles are prone to occur in the curved areas, especially in the corner areas; due to the presence of wrinkles, the screen encapsulation is prone to cracking and black spots appear. Summary of the Invention

[0004] This invention provides a display panel and a display device that can reduce the probability of wrinkles in the display panel, improve the yield rate of the display panel, and enhance the display effect in corner curved sub-areas.

[0005] This invention provides a display panel, which includes a planar display area and a curved display area adjacent to the planar display area. The curved display area includes a plurality of side curved surface sub-areas disposed around the periphery of the planar display area and a corner curved surface sub-area connecting two adjacent side curved surface sub-areas.

[0006] The display panel also includes:

[0007] Panel body;

[0008] A back panel is disposed on one side of the main body of the panel;

[0009] A polarizer is disposed on the side of the panel body away from the back plate;

[0010] Specifically, at least within the corner curved surface sub-region, the thickness of the back plate is greater than the thickness of the polarizer.

[0011] In one embodiment of the present invention, within the side curved surface sub-region, the thickness of the back plate is greater than the thickness of the polarizer.

[0012] In one embodiment of the present invention, the thickness of the back plate in the corner curved surface sub-region is greater than the thickness of the back plate in the side curved surface sub-region.

[0013] In one embodiment of the present invention, within the planar display area, the thickness of the back plate is greater than the thickness of the polarizer.

[0014] In one embodiment of the present invention, the thickness of the back plate in the curved display area is greater than the thickness of the back plate in the flat display area.

[0015] In one embodiment of the present invention, the thickness of the back plate in the corner curved surface sub-region is equal to the thickness of the back plate in the side curved surface sub-region, and is also equal to the thickness of the back plate in the flat display area.

[0016] In one embodiment of the present invention, within the corner curved surface sub-region, the thickness of the back plate gradually increases in the direction away from the planar display area.

[0017] In one embodiment of the present invention, at least within the corner curved surface sub-region, the thickness of the back plate is greater than or equal to 90 micrometers and less than or equal to 250 micrometers, and the thickness of the polarizer is less than or equal to 106 micrometers.

[0018] In one embodiment of the present invention, at least within the corner curved surface sub-region, the difference between the thickness of the back plate and the thickness of the polarizer is greater than or equal to 40 micrometers.

[0019] In one embodiment of the present invention, the display panel further includes an adhesive layer disposed on the side of the polarizer away from the display panel, and a cover plate disposed on the side of the adhesive layer away from the polarizer, and at least in the corner curved surface sub-region, the thickness of the adhesive layer is greater than the thickness of the back plate.

[0020] In one embodiment of the invention, at least in the corner curved surface sub-region, the thickness of the adhesive layer is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

[0021] In one embodiment of the present invention, the back panel includes a back panel body and a thickened portion disposed on the back panel body on the side close to or away from the panel body, and the thickened portion is at least disposed within the corner curved surface sub-region.

[0022] In one embodiment of the present invention, the material of the thickened portion may be the same as or different from the material of the back plate body.

[0023] In one embodiment of the present invention, the back panel body includes a first sub-part disposed in the planar display area and a second sub-part disposed in the corner curved surface sub-area, and the elastic modulus of the first sub-part is greater than the elastic modulus of the second sub-part.

[0024] In one embodiment of the present invention, the back plate is bent along the side away from the panel body in the curved display area, wherein the thickened portion is located on the side of the back plate body close to the panel body and in the corner curved sub-area, and the elastic modulus of the thickened portion is greater than the elastic modulus of the second sub-part and less than the elastic modulus of the first sub-part.

[0025] Alternatively, the thickened portion is located on the side of the back plate away from the main body of the panel and within the corner curved surface sub-region, and the elastic modulus of the thickened portion is less than the elastic modulus of the second sub-portion.

[0026] In one embodiment of the present invention, the panel body includes a substrate and a display functional layer disposed on the side of the substrate near the polarizer. The substrate includes a first organic flexible layer and a second organic flexible layer, the second organic flexible layer being located between the first organic flexible layer and the display functional layer, and the thickness of the first organic flexible layer being less than 10 micrometers.

[0027] In one embodiment of the present invention, the thickness of the first organic flexible layer is greater than or equal to 6 micrometers.

[0028] In one embodiment of the present invention, the panel body further includes an encapsulation layer disposed on the side of the display function layer away from the substrate. The encapsulation layer includes a first inorganic layer, an organic layer and a second inorganic layer stacked together, and the thickness of the organic layer is less than or equal to 10 micrometers.

[0029] In one embodiment of the present invention, at least a portion of the back plate is Gaussian curved within the corner curved sub-region, and the panel body is in contact with the back plate which is Gaussian curved, wherein the compression ratio of the back plate which is Gaussian curved is greater than or equal to 0.2.

[0030] According to the above-mentioned objectives of the present invention, embodiments of the present invention also provide a display device, the display device including a device body and a display panel, wherein the device body and the display panel are integrated into one unit.

[0031] The beneficial effects of this invention are as follows: The stacking thickness of the display panel is designed in this invention so that, at least in the corner curved sub-region, the thickness of the back plate is greater than the thickness of the polarizer. Therefore, compared with the prior art, the thickness of the back plate in the corner curved sub-region can be increased. By increasing the thickness of the back plate in the corner curved sub-region, the stress threshold for wrinkling of the display panel is increased, the probability of wrinkling of the display panel is reduced, thereby improving the yield of the display panel and the display effect in the corner curved sub-region. Attached Figure Description

[0032] The technical solution and other beneficial effects of the present invention will become apparent from the following detailed description of specific embodiments of the invention, in conjunction with the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of a display panel provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the bending process structure of a display panel provided in an embodiment of the present invention;

[0035] Figure 3 A wrinkle degree characterization curve of a display panel provided in an embodiment of the present invention;

[0036] Figure 4 Another wrinkle degree characterization curve of the display panel provided in the embodiment of the present invention;

[0037] Figure 5 Another wrinkle degree characterization curve of the display panel provided in the embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the planar distribution structure of the display panel provided in an embodiment of the present invention;

[0040] Figure 8 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention;

[0042] Figure 10 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention;

[0043] Figure 11 A simulation diagram of wrinkle generation in the display panel in embodiment M1 of the present invention;

[0044] Figure 12 A simulation diagram of wrinkle generation in the display panel in embodiment M2 of the present invention;

[0045] Figure 13 The accompanying image shows a comparison of the wrinkle formation on the display panel in embodiment M1 and the display panel in embodiment M2, provided as embodiments of the present invention.

[0046] Figure 14 A schematic diagram of the structure of a panel body provided in an embodiment of the present invention;

[0047] Figure 15 This is a schematic diagram of another structure of the panel body provided in an embodiment of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0049] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] This invention provides a display panel, please refer to... Figure 1 The display panel includes a flat display area 101 and a curved display area 102 adjacent to the flat display area 101. The curved display area 102 includes a plurality of side curved surface sub-areas 1021 disposed on the periphery of the flat display area 101 and a corner curved surface sub-area 1022 connected between adjacent side curved surface sub-areas 1021.

[0051] The display panel also includes a panel body 10, a back plate 20, and a polarizer 30; furthermore, the back plate 20 is disposed on one side of the panel body 10, and the polarizer 30 is disposed on the side of the panel body 10 away from the back plate 20.

[0052] Among them, at least in the corner curved surface sub-region 1022, the thickness of the back plate 20 is greater than the thickness of the polarizer 30.

[0053] In the implementation process, at least within the corner curved surface sub-region 1022, the thickness of the back plate 20 is greater than the thickness of the polarizer 30. Therefore, compared to the prior art where the thickness of the polarizer is generally greater than the thickness of the back plate, the present invention can increase the thickness of the back plate 20 within the corner curved surface sub-region 1022 and make it greater than the thickness of the polarizer 30. By increasing the thickness of the back plate 20 within the corner curved surface sub-region 1022, the stress threshold for wrinkles to form on the display panel is increased, the probability of wrinkles forming on the display panel is reduced, thereby improving the yield rate of the display panel and the display effect within the corner curved surface sub-region 1022.

[0054] Specifically, please continue to refer to Figure 1 as well as Figure 2 The display panel includes a panel body 10, a back plate 20, a polarizer 30, and a cover plate 50; wherein, the back plate 20 is attached to one side of the panel body 10 through a first adhesive layer 42, the polarizer 30 is disposed on the side of the panel body 10 away from the back plate 20, and the cover plate 50 is attached to the side of the polarizer 30 away from the panel body 10 through an adhesive layer 41.

[0055] It is understandable that the polarizer 30 is located on the light-emitting side of the panel body 10 to reduce reflected light and improve the display effect, while the back plate 20 is located on the side of the panel body 10 away from the light-emitting side to support and protect the panel body 10.

[0056] Furthermore, the display panel includes a display area, which includes a flat display area 101 and a curved display area 102 adjacent to the flat display area 101. The curved display area 102 includes a plurality of side curved surface sub-areas 1021 disposed around the flat display area 101, and a corner curved surface sub-area 1022 located between two adjacent side curved surface sub-areas 1021.

[0057] It should be noted that, in this embodiment of the invention, the display panel can be a four-curved display panel, that is, the number of side curved sub-regions 1021 is four, and a corner is formed between any two adjacent side curved sub-regions 1021, that is, a corner curved sub-region 1022 is formed; and the display panel is curved within the curved display area 102 and bends toward the side away from the light-emitting side to form a four-curved display panel. This embodiment of the invention uses the number of curved surfaces and the bending direction of the above-mentioned display panel as an example for explanation, but is not limited thereto.

[0058] Verification revealed that the wrinkles in the curved display panel primarily occurred during the cover plate bonding process. Please refer to... Figure 1 as well as Figure 2This is a schematic diagram of the bonding process between the display module 60 and the cover plate 50 in an embodiment of the present invention. During the bonding of the cover plate 50, the display module is not yet fully manufactured. At this stage, the display module 60 mainly includes a stacked back plate 20, a first adhesive layer 42, a panel body 10, a polarizer 30, and an adhesive layer 41. The above-mentioned module structure is bonded to the cover plate 50 using a bonding equipment, which includes a lower stage 71, a bending member 72 disposed on the lower stage 71, and an upper stage 73 disposed above the lower stage 71. A fixing clamping mechanism 74 is disposed between the lower stage 71 and the upper stage 73, and a carrier substrate 75 is clamped and fixed by the fixing clamping mechanism 74. Specifically, the display module 60 is placed on the carrier substrate 75, and the cover plate 50 is placed inside the upper stage 73, with the curvature of the cover plate 50 matching the curvature of the upper stage 73. Then, the lower stage moves upward with the bending member 72, causing both the carrier substrate 75 and the display module 60 to bend and adhere to the side of the cover plate 50 near the display module 60, so as to form a Gaussian curved surface at the corner. Verification of this embodiment of the invention has shown that during the bonding process between the display module 60 and the cover plate 50, because the curved surface area of ​​the display module 60 at the corner is larger than that of the cover plate 50 at the corner, wrinkles are easily formed.

[0059] Therefore, this invention embodiment conducted repeated multi-factor experiments to verify and analyze the thickness relationship between the various film layers in the display panel, and found that increasing the thickness of the backplate 20 can significantly improve the wrinkling phenomenon at the corners of the display panel; please refer to Figure 1 , Figure 3 , Figure 4 as well as Figure 5 ,in, Figure 3 , Figure 4 as well as Figure 5 In this embodiment of the invention, within the corner curved surface sub-region 1022, when the backplate 20 has different thicknesses and different size relationships with the polarizer 30, the characterization result of the degree of wrinkling of the display panel within the corner curved surface sub-region 1022 is as follows: Figure 3 The corresponding backplate 20 has a thickness of 60 micrometers. Figure 4 The corresponding backplate 20 has a thickness of 90 micrometers. Figure 5 The corresponding backplate 20 has a thickness of 150 micrometers, and Figure 3 , Figure 4 as well as Figure 5 The thickness of the corresponding polarizer 30 is 106 micrometers.

[0060] It is understood that, for ease of verification, the embodiments of the present invention provide... Figure 3 , Figure 4 as well as Figure 5The thickness of the back panel 20 and the polarizer 30 are both the full thickness of the back panel 20 and the polarizer 30, but the verification area is the corner curved sub-area 1022 of the display panel.

[0061] Among them, by Figure 3 From this, we can obtain that the maximum wrinkle amplitude of the display panel is 0.074 mm, which is... Figure 4 It can be obtained that the maximum wrinkle amplitude of the display panel is 0.064 mm, which is determined by... Figure 5 It can be obtained that the maximum wrinkle amplitude of the display panel is 0.052 mm; where the maximum wrinkle amplitude represents the maximum distance between the peaks and troughs of the wrinkle waveform, that is, the smaller the maximum wrinkle amplitude, the less wrinkle the display panel produces; furthermore, it can be seen that as the thickness of the back panel 20 increases, the maximum wrinkle amplitude of the display panel decreases, that is, the degree of wrinkle production on the display panel decreases; and... Figure 5 The characterization results of the degree of wrinkling in the display panel and Figure 3 , Figure 4 Comparing the characterization results of the degree of wrinkling in the display panel, it can be seen that when the thickness of the back plate 20 is greater than the thickness of the polarizer 30, the maximum wrinkle amplitude of the display panel decreases more significantly. Therefore, it can be demonstrated that in this embodiment of the invention, by increasing the thickness of the back plate 20 and setting the thickness of the back plate 20 to be greater than the thickness of the polarizer 30, the degree of wrinkling in the corner curved sub-region 1022 of the display panel can be effectively reduced, improving the yield rate of the display panel and enhancing the curved display effect of the display panel.

[0062] The film layer structure of the display panel provided in the embodiments of the present invention will be described below with reference to specific embodiments.

[0063] In one embodiment of the present invention, please refer to Figure 6 and Figure 7 ,and Figure 6 It can be Figure 7 The schematic diagram of the cross-sectional structure obtained along line AA shows that, in this embodiment, at least within the corner curved surface sub-region 1022, the thickness of the back plate 20 is greater than the thickness of the polarizer 30. That is, in this embodiment of the invention, the thickness of the back plate 20 located within the corner curved surface sub-region 1022 is increased to be greater than the thickness of the polarizer 30.

[0064] In this embodiment of the invention, at least a portion of the display panel is Gaussian curved within the corner curved sub-region 1022, and the compression ratio of the Gaussian curved display panel is greater than or equal to 0.2. That is, each film layer bonded to at least a portion of the display panel within the corner curved sub-region 1022 is Gaussian curved with a large curvature. Specifically, it may include a back plate 20, a panel body 10, a polarizer 30, and an adhesive layer 41. In the prior art, since the back plate 20, panel body 10, polarizer 30, and adhesive layer 41 in the display panel need to be bonded to the Gaussian curved cover plate 50 at the corner, but the curved surface area of ​​the back plate 20, panel body 10, polarizer 30, and adhesive layer 41 at the corner is large and larger than the curved surface area of ​​the cover plate 50 at the corner, wrinkles are more likely to occur, leading to stress concentration, which can easily cause encapsulation failure and black spots. However, in this embodiment of the invention, the thickness of the back plate 20 located in the corner curved sub-region 1022 can be increased to be greater than the thickness of the polarizer 30, thereby increasing the stress threshold for wrinkling of the display panel. This makes it easier for the back plate 20 to bend into a Gaussian surface in the corner curved sub-region 1022 and reduces the probability of wrinkling of the display panel. This improves the yield rate of the display panel and the display effect in the corner curved sub-region 1022, thus improving the curved display effect of the display panel.

[0065] Furthermore, in this embodiment of the invention, the thickness of the back plate 20 is increased within the corner curved surface sub-region 1022, that is, the back plate 20 includes a back plate body 21 and a thickened portion 22 disposed on the back plate body 21, and the thickened portion 22 is located within the corner curved surface sub-region 1022.

[0066] It is understandable that the thickness of the back panel 20 in the corner curved sub-area 1022 is greater than the thickness of the back panel 20 in the side curved sub-area 1021 and the flat display area 101.

[0067] In this embodiment, the thickened portion 22 is disposed on the side of the back panel body 21 close to the panel body 10, and the thickness of the thickened portion 22 is uniform; the thickness of the first adhesive layer 42 in the corner curved sub-region 1022 is less than the thickness of the first adhesive layer 42 outside the corner curved sub-region 1022, that is, the side of the first adhesive layer 42 away from the back panel 20 can be a plane to compensate for the step difference generated by the back panel 20, so as to improve the bonding yield of the back panel 20 and the panel body 10.

[0068] Furthermore, the back panel body 21 includes a first sub-part 211 located within the flat display area 101 and a second sub-part 212 located within the corner curved surface sub-area 1022. The elastic modulus of both the thickened part 22 and the second sub-part 212 is smaller than that of the first sub-part 211. Since the thickened part 22 and the second sub-part 212 are located within the corner curved surface sub-area 1022, they need to be bent into a Gaussian surface to reduce the elastic modulus of the thickened part 22 and the second sub-part 212. The modulus is set to be less than that of the first sub-part 211 to improve the flexibility of the thickened part 22 and the second sub-part 212 and reduce bending stress. In addition, the modulus of elasticity of the second sub-part 212 is also less than that of the thickened part 22. Since the second sub-part 212 is located on the inside of the bend when the display panel is bent, the compression and bending stress it is subjected to is greater than that of the thickened part 22. Therefore, the modulus of elasticity of the second sub-part 212 is set to be even smaller to further improve the flexibility of the second sub-part 212.

[0069] Optionally, the elastic modulus of the first sub-part 211 can be greater than or equal to 3300 MPa and less than or equal to 3700 MPa, while the elastic modulus of the second sub-part 212 and the elastic modulus of the thickened part 22 can both be greater than or equal to 2500 MPa and less than or equal to 3000 MPa.

[0070] Optionally, the material of the thickened portion 22 may be the same as or different from the material of the back panel body 21, and both the material of the thickened portion 22 and the material of the back panel body 21 may include polyethylene terephthalate or polyimide.

[0071] In this embodiment of the invention, the material of the adhesive layer 41 may include OCA adhesive. In this embodiment of the invention, at least in the corner curved surface sub-region 1022, the thickness of the adhesive layer 41 is greater than the thickness of the back plate 20. That is, the thickness of the adhesive layer 41 is also increased to increase the thickness of the adhesive layer 41 in the corner curved surface sub-region 1022, thereby increasing the stress threshold for wrinkles to form on the display panel, reducing the probability of wrinkles to form on the display panel, and thus improving the yield rate of the display panel and the display effect in the corner curved surface sub-region 1022.

[0072] Continuing from the above, in at least the corner curved surface sub-region 1022, the thickness of the back plate 20 is greater than the thickness of the polarizer 30. Therefore, compared to the prior art where the thickness of the polarizer is greater than the thickness of the back plate, the thickness of the back plate 20 in the corner curved surface sub-region 1022 can be increased. By increasing the thickness of the back plate 20 in the corner curved surface sub-region 1022, the stress threshold for wrinkles to form on the display panel is increased, the probability of wrinkles forming on the display panel is reduced, thereby improving the yield rate of the display panel and the display effect in the corner curved surface sub-region 1022.

[0073] In another embodiment of the present invention, please refer to Figure 8The difference between this embodiment and the previous embodiment is that, within the corner curved surface sub-area 1022, the thickness of the back plate 20 gradually increases in the direction away from the flat display area 101, that is, the thickness of the thickened portion 22 gradually increases in the direction away from the flat display area 101.

[0074] Continuing from the above, this embodiment makes the thickness of the back plate 20 gradually change, reducing the probability of wrinkles in the display panel, thereby improving the yield of the display panel and the display effect in the corner curved sub-area 1022. At the same time, it can also avoid adverse phenomena such as stress concentration caused by sudden changes in the thickness of the back plate 20.

[0075] In another embodiment of the present invention, please refer to Figure 9 The difference between this embodiment and the first embodiment is that the thickened portion 22 is provided on the side of the back panel body 21 away from the panel body 10.

[0076] In this embodiment, the elastic modulus of the thickened portion 22 and the second sub-portion 212 are both smaller than the elastic modulus of the first sub-portion 211. Since the thickened portion 22 and the second sub-portion 212 are located within the corner curved surface sub-region 1022, they need to be bent into the Gaussian surface. Therefore, the elastic modulus of the thickened portion 22 and the second sub-portion 212 are set to be smaller than the elastic modulus of the first sub-portion 211 to improve the flexibility of the thickened portion 22 and the second sub-portion 212 and reduce the bending stress. In addition, the elastic modulus of the thickened portion 22 is also smaller than the elastic modulus of the second sub-portion 212. Since the thickened portion 22 is located on the inside of the bend when the display panel is bent, the compression and bending stress it receives is greater than that of the second sub-portion 212. Therefore, the elastic modulus of the thickened portion 22 is set to be even smaller to further improve the flexibility of the thickened portion 22.

[0077] Continuing from the above, in at least the corner curved surface sub-region 1022, the thickness of the back plate 20 is greater than the thickness of the polarizer 30. Therefore, compared to the prior art where the thickness of the polarizer is greater than the thickness of the back plate, the thickness of the back plate 20 in the corner curved surface sub-region 1022 can be increased. By increasing the thickness of the back plate 20 in the corner curved surface sub-region 1022, the stress threshold for wrinkles to form on the display panel is increased, the probability of wrinkles forming on the display panel is reduced, thereby improving the yield rate of the display panel and the display effect in the corner curved surface sub-region 1022.

[0078] In another embodiment of the present invention, please refer to Figure 6 , Figure 7 as well as Figure 10 ,and Figure 10 for Figure 7The cross-sectional structure diagram obtained along the BB line shows that the difference between this embodiment and the first embodiment is that the thickness of the back plate 20 is greater than the thickness of the polarizer 30 in both the side curved surface sub-region 1021 and the corner curved surface sub-region 1022.

[0079] It is understandable that the thickness of the back plate 20 in the corner curved sub-region 1022 is greater than the thickness of the back plate 20 in the side curved sub-region 1021, and the thickness of the back plate 20 in the side curved sub-region 1021 is greater than the thickness of the back plate 20 in the flat display area 101; that is, in this embodiment, the portion of the back plate 20 located in the curved display area 102 is thickened to effectively reduce the probability of wrinkles caused by bending in the curved display area 102. Moreover, since the curvature of the back plate 20 in the corner curved sub-region 1022 is greater, the thickness of the back plate 20 in the corner curved sub-region 1022 is the greatest, which can further reduce the probability of wrinkles in the back plate 20 compared to the side curved sub-region 1021.

[0080] Furthermore, the backplate body 21 also includes a third sub-part 213 disposed in the side curved surface sub-region 1021, and the elastic modulus of the third sub-part 213 is less than that of the first sub-part 211, so as to improve the flexibility of the backplate 20 in the side curved surface sub-region 1021 and reduce bending stress; the elastic modulus of the third sub-part 213 can also be greater than that of the second sub-part 212. Since the bending curvature is the largest in the corner curved surface sub-region 1022, the elastic modulus of the second sub-part 212 is the smallest in this embodiment, so as to realize the gradient design of the elastic modulus of the backplate 20 to meet the flexibility requirements in different regions.

[0081] Continuing from the above, in at least the corner curved surface sub-region 1022, the thickness of the back plate 20 is greater than the thickness of the polarizer 30. Therefore, compared to the prior art where the thickness of the polarizer is greater than the thickness of the back plate, the thickness of the back plate 20 in the corner curved surface sub-region 1022 can be increased. By increasing the thickness of the back plate 20 in the corner curved surface sub-region 1022, the stress threshold for wrinkles to form on the display panel is increased, the probability of wrinkles forming on the display panel is reduced, thereby improving the yield rate of the display panel and the display effect in the corner curved surface sub-region 1022.

[0082] In other embodiments of the invention, the thickness of the backplate 20 is greater than the thickness of the polarizer 30 over the entire display area, i.e., within the flat display area 101 and the curved display area 102. Figure 1As shown. In this embodiment, the back panel 20 is thickened as a whole, and the thickness of the back panel 20 in the side curved surface sub-area 1021 and the thickness in the corner curved surface sub-area 1022 are equal to the thickness of the back panel 20 in the flat display area 101. In this embodiment, the thickened part can cover the entire back panel body on the side close to the panel body 10 or cover the side of the back panel body away from the panel body 10 (not shown in the figure).

[0083] In addition, when the back plate 20 is thickened as a whole, the thickness of the back plate 20 can also be set in a gradient manner, that is, the thickness of the back plate 20 in the corner curved surface sub-area 1022 is greater than the thickness of the back plate 20 in the side curved surface sub-area 1021, and the thickness of the back plate 20 in the side curved surface sub-area 1021 is greater than the thickness of the back plate 20 in the flat display area 101.

[0084] Furthermore, the elastic modulus of the back panel 20 in the curved display area 102 is less than that in the flat display area 101, and the elastic modulus of the back panel 20 in the corner curved sub-area 1022 is less than that in the side curved sub-area 1021, so as to achieve a gradient design of the elastic modulus of the back panel 20 to meet the flexibility requirements in different areas.

[0085] Continuing from the above, in this embodiment, the thickness of the back plate 20 in both the flat display area 101 and the curved display area 102 is greater than the thickness of the polarizer 30. That is, the back plate 20 is thickened as a whole, which improves the yield rate of the display panel and the display effect in the corner curved sub-area 1022. At the same time, it does not require different thickness settings for the back plate 20, simplifying the manufacturing difficulty and process of the back plate 20.

[0086] It should be noted that, in this embodiment of the invention, as the thickness of the back plate 20, the polarizer 30, and the adhesive layer 41 increases, the degree of wrinkling in the corner curved sub-area 1022 of the display panel can be reduced. However, when the thickness of the back plate 20 is too large, it can also lead to poor adhesion of the back plate 20 in the corner curved sub-area 1022. In addition, since the elastic modulus of the polarizer 30 is relatively large, generally around 4000 MPa, and its hardness is relatively high, if the thickness of the polarizer 30 is too large, it will be difficult for the polarizer 30 to bend, and thus it is easy to peel off during the bonding process between the display module 60 and the cover plate 50. When the thickness of the adhesive layer 41 is too large, it can easily affect the light transmission of the display panel and reduce the display effect of the display panel.

[0087] Continuing on the above, optionally, at least within the corner curved sub-region 1022, the thickness of the backplate 20 can be greater than or equal to 90 micrometers and less than or equal to 250 micrometers, the thickness of the polarizer 30 can be greater than or equal to 66 micrometers and less than or equal to 106 micrometers, and the thickness of the adhesive layer 41 can be greater than or equal to 100 micrometers and less than or equal to 200 micrometers. Within the aforementioned thickness range, the thickness of the backplate 20 is greater than the thickness of the polarizer 30 to further reduce the degree of wrinkling in the display panel.

[0088] Please combine Figure 1 , Figure 11 , Figure 12 as well as Figure 13 As shown, in this embodiment of the invention, the thickness of the back plate 20, the polarizer 30 and the adhesive layer 41 are set, and the degree of wrinkle reduction of the back plate 20, the polarizer 30 and the adhesive layer 41 in the corner curved surface sub-region 1022 is verified.

[0089] In this embodiment, the thickness of the backplate 20 is 150 micrometers, the thickness of the polarizer 30 is 106 micrometers, and the thickness of the adhesive layer 41 is 200 micrometers. This is to ensure that the thickness of the adhesive layer 41 is greater than the thickness of the backplate 20, and the thickness of the backplate 20 is greater than the thickness of the polarizer 30. This is designated as Example M1 for verification, and the results are as follows. Figure 11 and Figure 13 As shown.

[0090] The thickness of the backplate 20 was set to 90 micrometers, the thickness of the polarizer 30 to 66 micrometers, and the thickness of the adhesive layer 41 to 100 micrometers. This was to ensure that the thickness of the adhesive layer 41 was greater than the thickness of the backplate 20, and the thickness of the backplate 20 was greater than the thickness of the polarizer 30. This was designated as Example M2 for verification, and the results were as follows. Figure 12 and Figure 13 As shown.

[0091] Depend on Figure 11 , Figure 12 as well as Figure 13 It can be seen that as the thickness of the back plate 20, polarizer 30 and adhesive layer 41 increases, that is, the thickness of the back plate 20, polarizer 30 and adhesive layer 41 in embodiment M1 increases compared to embodiment M2, and the thickness of the display panel in embodiment M1 increases by 200 micrometers compared to the display panel in embodiment M2 while other film layers of the display panel remain unchanged; wherein, the display panel in embodiment M2 still has wrinkles, while with the increase in the thickness of the back plate 20, polarizer 30 and adhesive layer 41, the display panel in embodiment M1 has basically eliminated wrinkles.

[0092] Therefore, in this embodiment of the invention, as the thickness of the back plate 20, the polarizer 30 and the adhesive layer 41 increases, the degree of wrinkling of the display panel can be reduced.

[0093] Furthermore, when the thickness of the backplate 20 is greater than 90 micrometers and the thickness continues to increase, the degree of wrinkles generated in the display panel decreases, and when the thickness of the backplate 20 reaches 150 micrometers, the wrinkles in the display panel are basically eliminated; therefore, preferably, at least in the corner curved surface sub-region 1022, the thickness of the backplate 20 can be greater than or equal to 90 micrometers and less than or equal to 150 micrometers.

[0094] Furthermore, in this embodiment of the invention, the back plate 20 and the polarizer 30 are thickened to reduce the degree of wrinkles in the display panel. However, since the polarizer 30 has a large elastic modulus, when the polarizer 30 is thickened to a large degree, it is easier for the film layer to peel off during bonding. Therefore, the thickness of the back plate 20 needs to be greater than the thickness of the polarizer 30. According to the above verification results, the difference between the thickness of the back plate 20 and the thickness of the polarizer 30 can be greater than or equal to 40 micrometers to ensure the effect of improving the wrinkles of the display panel.

[0095] Continuing from the above, this embodiment of the invention sets the thickness of the backplate 20, the polarizer 30, and the adhesive layer 41, and verifies the set thickness. It has been shown that, within the corner curved sub-region 1022 of the display panel, as the thickness of the backplate 20 increases and exceeds the thickness of the polarizer 30, the phenomenon of wrinkles forming in the corner curved sub-region 1022 of the display panel will be effectively improved. At the same time, increasing the thickness of the adhesive layer 41 is also beneficial to improving the phenomenon of wrinkles forming in the display panel. That is, this embodiment of the invention can improve the yield rate of the display panel.

[0096] In the embodiments of the present invention, please refer to Figure 1 , Figure 14 as well as Figure 15 The panel body 10 includes a substrate 11, a display function layer 12 disposed sequentially on the side of the substrate 11 near the polarizer 30, and an encapsulation layer 13 disposed on the side of the display function layer 12 near the polarizer 30.

[0097] Specifically, the substrate 11 includes a first organic flexible layer 111, a first water and oxygen barrier layer 113, a second organic flexible layer 112, and a second water and oxygen barrier layer 114 stacked sequentially. The first organic flexible layer 111 and the second organic flexible layer 112 can both be made of polyimide, and the first water and oxygen barrier layer 113 and the second water and oxygen barrier layer 114 can both be made of at least one of silicon oxide or silicon nitride.

[0098] In this embodiment of the invention, the thickness of the first organic flexible layer 111 is less than 10 micrometers, which is less than the thickness of the polyimide flexible substrate layer located at the bottom in the existing display panel. This reduces the thickness of the panel body 10 in this embodiment of the invention, improves the bending performance of the panel body 10 in the corner curved sub-region 1022, reduces the bending stress on the panel body 10, reduces the probability of damage caused by stress concentration due to excessive bending curvature in the corner curved sub-region 1022, and improves the yield of the display panel.

[0099] Furthermore, the thickness of the first organic flexible layer 111 needs to be greater than or equal to 6 micrometers to avoid damage to the devices inside the panel body 10 by laser energy during the laser peeling process of the display panel from the glass substrate.

[0100] Optionally, the thickness of the first organic flexible layer 111 is equal to the thickness of the second organic flexible layer 112, and is equal to 6 micrometers.

[0101] Furthermore, the display functional layer 12 may include a thin film transistor layer 121 and a light-emitting functional layer 122. The thin film transistor layer 121 includes thin film transistors and an insulating layer covering the thin film transistors. The light-emitting functional layer 122 includes an anode, a pixel definition layer, an organic light-emitting layer, and a cathode layer disposed on the insulating layer. The anode is electrically connected to the thin film transistor to realize signal transmission. The above structures can all be implemented with reference to conventional processes, and will not be described in detail here.

[0102] The encapsulation layer 13 is disposed on the side of the cathode layer away from the substrate 11, and the encapsulation layer 13 includes a first inorganic layer 131, an organic layer 132 and a second inorganic layer 133 sequentially stacked on the cathode layer. In this embodiment of the invention, the thickness of the organic layer 132 is less than or equal to 10 micrometers, which is less than the thickness of the organic encapsulation layer in the existing display panel, so as to further reduce the thickness of the panel body 10, further improve the bending performance of the panel body 10 in the corner curved surface sub-region 1022, reduce the bending stress on the panel body 10, reduce the probability of damage caused by stress concentration due to excessive bending curvature in the corner curved surface sub-region 1022, and improve the yield of the display panel.

[0103] In addition, the thickness of the organic layer 132 needs to be greater than or equal to 8 micrometers to ensure that the organic layer 132 can be leveled during the preparation process and to ensure the encapsulation effect of the encapsulation layer 13.

[0104] In addition, the display panel provided in this embodiment of the invention also includes a functional film layer disposed on the side of the back plate 20 away from the panel body 10. Specifically, it may include a light-shielding film 81 disposed on the side of the back plate 20 away from the panel body 10 and a buffer layer 82 disposed on the side of the light-shielding film 81 away from the back plate 20. Optionally, the material of the buffer layer 82 may be foam; or the material of the buffer layer 82 may also be a combination of foam and metal materials, so that the buffer layer 82 can play a certain heat dissipation role while playing a buffering role, wherein the metal material may be aluminum and copper.

[0105] In other embodiments of the present invention, the functional film layer may further include a heat dissipation material layer 84 disposed on the side of the buffer layer 82 away from the light-shielding film 81, and an electromagnetic shielding layer 85 disposed on the side of the heat dissipation material layer 84 away from the buffer layer 82. The heat dissipation material layer 84 may be bonded to the buffer layer 82 via a second adhesive layer 83.

[0106] Furthermore, the lengths of the heat dissipation material layer 84 and the electromagnetic shielding layer 85 along the direction parallel to the display panel are both less than the lengths of the other film layers of the display panel along the direction parallel to the display panel; that is, the heat dissipation material layer 84 and the electromagnetic shielding layer 85 are recessed at one end of the display panel to form a space on the side of the buffer layer 82 away from the back plate 20, and after the display panel is bonded and bent, this space can be used to place the driver chip (not shown in the figure) that has been bonded and bent to the side of the buffer layer 82 away from the back plate 20.

[0107] In summary, by setting the thickness of the back plate 20 to be greater than the thickness of the polarizer 30 within at least the corner curved sub-region 1022, the present invention can effectively reduce the degree of wrinkling of the display panel within the corner curved sub-region 1022, improve the yield rate of the display panel, and enhance the curved display effect of the display panel. Furthermore, within the thickness range set in the present invention, increasing the thickness of the back plate 20, the polarizer 30, and the adhesive layer 41 can effectively reduce the degree of wrinkling of the display panel within the corner curved sub-region 1022. In addition, the present invention also improves the bending performance of the panel body 10 within the corner curved sub-region 1022 by reducing the thickness of the organic film layer within the panel body 10, thereby reducing the bending stress on the panel body 10 and reducing the probability of damage caused by stress concentration due to excessive bending curvature in the corner curved sub-region 1022, thus improving the yield rate of the display panel.

[0108] In addition, this embodiment of the invention also provides a display device, which includes a device body and a display panel as described in the above embodiments, and the device body and the display panel are combined into one unit.

[0109] In this embodiment of the invention, the main body of the device may include a middle frame, frame adhesive, etc., and the display device may be a display terminal such as a mobile phone, tablet, or television, which is not limited here.

[0110] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0111] The above provides a detailed description of a display panel and display device provided by the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, The display panel includes a flat display area and a curved display area adjacent to the flat display area, and the curved display area includes a plurality of side curved surface sub-areas disposed on the periphery of the flat display area and a corner curved surface sub-area connecting two adjacent side curved surface sub-areas; The display panel also includes: Panel body; A back panel is disposed on one side of the main body of the panel; A polarizer is disposed on the side of the panel body away from the back plate; Wherein, at least within the corner curved surface sub-region, the thickness of the back plate is greater than the thickness of the polarizer; At least within the corner curved surface sub-region, the difference between the thickness of the back plate and the thickness of the polarizer is greater than or equal to 40 micrometers.

2. The display panel according to claim 1, characterized in that, Within the side curved surface sub-region, the thickness of the back plate is greater than the thickness of the polarizer.

3. The display panel according to claim 1 or 2, characterized in that, The thickness of the back plate in the corner curved surface sub-region is greater than the thickness of the back plate in the side curved surface sub-region.

4. The display panel according to claim 2, characterized in that, Within the planar display area, the thickness of the back plate is greater than the thickness of the polarizer.

5. The display panel according to claim 2 or 4, characterized in that, The thickness of the back panel in the curved display area is greater than the thickness of the back panel in the flat display area.

6. The display panel according to claim 1, characterized in that, At least within the corner curved surface sub-region, the thickness of the back plate is greater than or equal to 90 micrometers and less than or equal to 250 micrometers, and the thickness of the polarizer is less than or equal to 106 micrometers.

7. The display panel according to claim 1, 2, 4 or 6, characterized in that, Within the corner curved surface sub-area, the thickness of the back plate gradually increases in the direction away from the planar display area.

8. The display panel according to claim 1, 2, 4 or 6, characterized in that, The thickness of the backplate in the corner curved surface sub-area is equal to the thickness of the backplate in the side curved surface sub-area, and is also equal to the thickness of the backplate in the flat display area.

9. The display panel according to claim 1, characterized in that, The display panel further includes an adhesive layer disposed on the side of the polarizer away from the display panel, and a cover plate disposed on the side of the adhesive layer away from the polarizer, and at least in the corner curved surface sub-area, the thickness of the adhesive layer is greater than the thickness of the back plate.

10. The display panel according to claim 9, characterized in that, At least within the corner curved surface sub-region, the thickness of the adhesive layer is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

11. The display panel according to claim 1, characterized in that, The back panel includes a back panel body and a thickened portion disposed on the back panel body on the side close to or away from the panel body, and the thickened portion is disposed at least within the corner curved surface sub-area.

12. The display panel according to claim 11, characterized in that, The material of the thickened portion is the same as the material of the back plate body.

13. The display panel according to claim 11, characterized in that, The back panel body includes a first sub-part disposed in the planar display area and a second sub-part disposed in the corner curved surface sub-area, wherein the elastic modulus of the first sub-part is greater than that of the second sub-part.

14. The display panel according to claim 13, characterized in that, The back plate is curved along the side away from the main body of the panel within the curved display area. The material of the thickened portion is different from that of the back plate body. The thickened portion is located on the side of the back plate body closer to the main body of the panel and within the corner curved sub-area. The elastic modulus of the thickened portion is greater than that of the second sub-part and less than that of the first sub-part. Alternatively, the thickened portion is located on the side of the back panel body away from the main panel body and within the corner curved surface sub-region, and the elastic modulus of the thickened portion is less than the elastic modulus of the second sub-portion.

15. The display panel according to claim 13, characterized in that, The backplate body also includes a third sub-part disposed in the side curved surface sub-region, wherein the elastic modulus of the third sub-part is greater than that of the second sub-part and less than that of the first sub-part.

16. The display panel according to claim 1, characterized in that, The panel body includes a substrate and a display functional layer disposed on the side of the substrate near the polarizer. The substrate includes a first organic flexible layer and a second organic flexible layer. The second organic flexible layer is located between the first organic flexible layer and the display functional layer. The thickness of the first organic flexible layer is greater than or equal to 6 micrometers and less than 10 micrometers.

17. The display panel according to claim 16, characterized in that, The panel body also includes an encapsulation layer disposed on the side of the display function layer away from the substrate. The encapsulation layer includes a first inorganic layer, an organic layer and a second inorganic layer stacked together, and the thickness of the organic layer is less than or equal to 10 micrometers.

18. The display panel according to claim 1, characterized in that, Within the corner curved surface sub-region, at least a portion of the display panel is Gaussian curved, and the compression ratio of the display panel with the Gaussian curved surface is greater than or equal to 0.

2.

19. The display panel according to claim 1, characterized in that, The display panel further includes a first adhesive layer, and the back panel is attached to the side of the panel body away from the polarizer via the first adhesive layer.

20. A display device, characterized in that, The display device includes a device body and a display panel as described in any one of claims 1 to 19, wherein the device body and the display panel are integrated into one unit.

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