Integrated flexible cover plate, preparation method thereof and display device

Abstract

Embodiments of the present application provide an integrated flexible cover plate, a preparation method thereof and a display device. The integrated flexible cover plate has a display area and a frame area at least partially surrounding the display area. The integrated flexible cover plate comprises: a cover plate body, the cover plate body comprising a first surface and a second surface opposite to each other in a thickness direction of the cover plate body; a coating film layer arranged on the first surface of the cover plate body, the coating film layer comprising a light-transmitting coating layer arranged on the first surface and corresponding to the display area, and the light-transmitting coating layer being connected with the cover plate body, and a black coating layer arranged on the first surface, at least partially surrounding the display area, and corresponding to the frame area, and the black coating layer being connected with the cover plate body; the black coating layer is integrally arranged around the light-transmitting coating layer and in the thickness direction of the cover plate body; and an optical adhesive layer arranged on the second surface of the cover plate body, the optical adhesive layer being connected with the cover plate body; the second surface is arranged opposite to the first surface in the thickness direction of the cover plate body.

Description

Technical Field

[0001] This application relates to the field of display device technology, and in particular to an integrated flexible cover plate, its preparation method, and a display device. Background Technology

[0002] Flexible foldable display modules consist of cover material, OCA (Optical Clear Adhesive) material, and screen and support materials. Regarding cover material, the 2D / 3D glass cover materials used in previous candybar displays are no longer suitable for foldable screens. Currently, the mainstream foldable cover materials on the market mainly include two categories: CPI (Colorless Polyimide) and UTG (Ultra-Thin Glass). UTG is made of glass, and its surface needs to be covered with a PET protective film to address its explosion-proof safety issues.

[0003] Existing flexible folding lid solutions primarily rely on different material suppliers providing various PET, OCA, and UTG materials, which are then bonded together at a die-cutting plant to achieve the desired functionality, such as bonding PET and CPI, PET and UTG, or CPI and UTG. However, these solutions suffer from low manufacturing efficiency, and yield losses during bonding increase material costs. Therefore, optimization of flexible lid materials and manufacturing processes is necessary. Summary of the Invention

[0004] This application provides an integrated flexible cover plate and its manufacturing method, a display panel, and a display device, which are intended to...

[0005] An embodiment of the first aspect of this application provides an integrated flexible cover plate, the integrated flexible cover plate having a display area and a border area at least partially surrounding the display area; the integrated flexible cover plate includes:

[0006] The cover plate body includes a first surface and a second surface that are opposite to each other along its own thickness direction;

[0007] A coating layer is disposed on the first surface of the cover plate body. The coating layer includes a light-transmitting coating layer disposed on the first surface corresponding to the display area and connected to the cover plate body, and a black coating layer disposed on the first surface, at least partially surrounding the display area and corresponding to the border area and connected to the cover plate body. The black coating layer is integrally connected around the light-transmitting coating layer and along the thickness direction of the cover plate body itself. The orthographic projections of both the light-transmitting coating layer and the black coating layer onto the cover plate body are located on the cover plate body.

[0008] An optical adhesive layer is disposed on the second surface of the cover plate body, and the optical adhesive layer is connected to the cover plate body.

[0009] According to the first aspect of this application, the plate body is a material with bending performance and high transmittance, wherein the cover plate body needs to meet the following requirements: light transmittance ≥ 98%, bending radius R ≤ 2.0 mm, and bending times ≥ 200,000 times.

[0010] According to the embodiments of the first aspect of this application, the cover plate body is made of ultra-thin flexible glass, colorless polyimide, polyethylene terephthalate, or a composite material of two or more.

[0011] According to an embodiment of the first aspect of this application, the thickness of the cover plate body is ≥50μm.

[0012] According to the embodiment of the first aspect of this application, the thickness of the cover plate body is 50μm to 70μm.

[0013] According to the first aspect of this application, the cover plate body is made of ultra-thin flexible glass.

[0014] According to an embodiment of the first aspect of this application, the thickness of the ultrathin flexible glass is 50 μm to 70 μm.

[0015] According to an embodiment of the first aspect of this application, the elastic modulus of the coating layer is less than the elastic modulus of the cover plate body.

[0016] According to an embodiment of the first aspect of this application, the thickness of the coated film is ≤30μm.

[0017] According to an embodiment of the first aspect of this application, the coated film contains 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids.

[0018] According to an embodiment of the first aspect of this application, the thickness of the optical adhesive layer is ≥25μm.

[0019] According to an embodiment of the first aspect of this application, the thickness of the optical adhesive layer is any value between 25 μm and 50 μm.

[0020] An embodiment of the second aspect of this application provides a method for manufacturing an integrated flexible cover plate, the integrated flexible cover plate having a display area and a border area at least partially surrounding the display area, the manufacturing method comprising:

[0021] A first liquid paste is applied to the first surface of the cover plate body in the thickness direction corresponding to the display area, and a second liquid paste is applied to the frame area that is at least surrounding a portion of the display area, to obtain a light-transmitting paste layer and a black paste layer on the first surface of the cover plate body.

[0022] The light-transmitting paste layer and the black paste layer in the frame area are cured to obtain a light-transmitting coating layer in the display area and a black coating layer in the frame area. The light-transmitting coating layer and the black coating layer are integrally connected to form an integral coating film layer. The orthogonal projection of the light-transmitting coating layer and the black coating layer on the cover plate body is located on the cover plate body.

[0023] A third liquid slurry is applied along the thickness direction of the cover plate body and onto the second surface opposite to the first surface, and then cured to form an optical adhesive layer that is integrally connected with the cover plate body, thus obtaining an integrated flexible cover plate.

[0024] According to an embodiment of the second aspect of this application, curing the light-transmitting paste layer and the black paste layer includes simultaneously curing the light-transmitting paste layer located in the display area and the black paste layer located in the border area.

[0025] According to the second aspect of this application, a light-transmitting paste layer and a black paste layer are obtained, and a curing process is performed on the light-transmitting paste layer and the black paste layer, including: first forming a light-transmitting paste layer, performing a pre-curing process on the light-transmitting paste layer to initially cure the light-transmitting paste layer; then forming a black paste layer, performing a pre-curing process on the black paste layer; and performing a final curing process on the pre-cured light-transmitting paste layer and the black paste layer to integrally connect the light-transmitting coating layer and the black coating layer into a coating film layer.

[0026] According to the second aspect of this application, a light-transmitting paste layer and a black paste layer are obtained, and a curing process is performed on the light-transmitting paste layer and the black paste layer, including: first forming a black paste layer, performing a pre-curing process on the black paste layer to initially cure the black paste layer; then forming a light-transmitting paste layer, performing a pre-curing process on the light-transmitting paste layer to initially cure the light-transmitting paste layer; and finally curing the pre-cured light-transmitting paste layer and the black paste layer to integrally connect the light-transmitting coating layer and the black coating layer into a coating film layer.

[0027] According to the embodiments of the second aspect of this application, both the translucent paste layer and the black paste layer can be pre-cured and finally cured using a high-temperature baking process.

[0028] According to an embodiment of the second aspect of this application, the first liquid slurry is selected from at least one of colorless polyimide, polymethyl methacrylate, and thermoplastic polyurethane.

[0029] According to an embodiment of the second aspect of this application, the first liquid slurry is colorless polyimide.

[0030] According to an embodiment of the second aspect of this application, the second liquid slurry is made by mixing a black pigment with at least one material selected from colorless polyimide, polymethyl methacrylate, and thermoplastic polyurethane.

[0031] According to an embodiment of the second aspect of this application, the second liquid slurry is prepared by mixing the black pigment with the same first liquid slurry as the light-transmitting coating layer.

[0032] According to an embodiment of the second aspect of this application, the black pigment includes one or more of carbon black nanoparticles, plant carbon black, iron oxide black, and fumed silica nanoparticles.

[0033] According to an embodiment of the second aspect of this application, the black pigment includes carbon black nanoparticles, iron oxide black, and plant carbon black in a mass ratio of (3-5):(2-6):(3-4).

[0034] According to an embodiment of the second aspect of this application, the black pigment includes carbon black nanoparticles, iron oxide black, and fumed silica nanoparticles in a mass ratio of (3-5):(2-4):(3-6).

[0035] According to an embodiment of the second aspect of this application, both the first liquid slurry and the second liquid slurry contain 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids.

[0036] According to an embodiment of the second aspect of this application, the long-chain fatty acid is selected from one or more combinations of tridecyl acid, tetradecyl acid, pentadecyl acid, hexadecyl acid, heptadecanyl acid, and octadecyl acid.

[0037] According to the embodiments of the second aspect of this application, the long-chain fatty acid is selected from one or more combinations of tridecyl acid, tetradecyl acid, and pentadecyl acid.

[0038] According to an embodiment of the second aspect of this application, the third liquid slurry is an optically transparent adhesive material.

[0039] According to the second aspect of this application, in the step of curing the third liquid slurry, the third liquid slurry is cured by ultraviolet light curing or high temperature thermal curing.

[0040] An embodiment of the third aspect of this application provides a display device, including: an integrated flexible cover plate provided in the first aspect embodiment above, and a screen body connected to the side of the optical adhesive layer away from the cover plate body.

[0041] In the integrated flexible cover provided in this application embodiment, a light-transmitting coating layer is provided on the display area of ​​the first surface of the cover body, and a black coating layer is provided on the frame area of ​​the first surface of the cover body, at least partially surrounding the display area. The black coating layer and the light-transmitting coating layer are integrally connected to form a coating film layer. An optical adhesive layer is provided on the second surface of the cover body, which is located opposite to the first surface along its own thickness direction. The optical adhesive layer is connected to the cover body, forming an integrated flexible cover with excellent comprehensive performance. This effectively reduces the processes of bonding materials, ink materials, and printing ink materials between the coating film layer and the cover body, as well as the processes of bonding materials and coating film layers. This reduces the manufacturing cost of the integrated flexible cover due to the yield loss caused by the aforementioned processes and improves the manufacturing efficiency of the integrated flexible cover. Attached Figure Description

[0042] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

[0043] Figure 1 This is a cross-sectional view of the integrated flexible cover plate in one embodiment.

[0044] Figure 2 This is a cross-sectional view of the integrated flexible cover plate in one embodiment.

[0045] Figure 3 This is a flowchart of a method for preparing an integrated flexible cover plate in one embodiment.

[0046] Figure 4 This is a schematic diagram of the structure of a display device in one embodiment.

[0047] Figure 5 This is a schematic diagram of the display device in another embodiment.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Cover plate body; 100. First surface; 200. Second surface; 101. Display area; 102. Bezel area;

[0050] 2. Coated film layer; 21. Transparent coating layer; 22. Black coating layer;

[0051] 3. Optical adhesive layer;

[0052] 4. Integrated flexible cover plate;

[0053] 5. Screen body;

[0054] 6. Display device; 7. Long-chain fatty acid; X, first direction; Y, thickness direction of the cover plate itself. Detailed Implementation

[0055] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] As described in the background section, existing cover plate solutions for flexible foldable display modules mainly include CPI cover plate bonding and UTG cover plate bonding. The CPI cover plate solution involves ink printing on CPI film at a die-cutting plant, followed by OCA bonding to the screen to achieve the cover plate component's function. The UTG cover plate solution primarily involves ink printing on a PET protective film at a die-cutting plant, followed by OCA and UTG bonding to create a cover plate containing both PET and UTG, which is then bonded to the screen via OCA to achieve the cover plate component's function. However, existing flexible foldable cover plate manufacturing methods involving bonding involve multiple processes. The use of ink printing and multi-layer bonding inevitably increases manufacturing time and costs, leading to low efficiency. Furthermore, each process generates a certain defect rate, resulting in yield losses and increased material costs. Therefore, improvements and optimizations to the flexible cover plate and its manufacturing process are necessary.

[0059] It should be noted that, in Figures 1 to 3 In the diagram, the black coating layer 22 is at least partially arranged in a ring around the light-transmitting coating layer 21. In the cross-sectional view of the integrated flexible cover plate 4, it is shown as the black coating layer 22 located at both ends of the light-transmitting coating layer 21 along the first direction X.

[0060] Please see Figure 1 , Figure 1 This is a cross-sectional view of the integrated flexible cover plate in one embodiment.

[0061] An embodiment of the first aspect of this application provides an integrated flexible cover plate 4, the integrated flexible cover plate 4 having a display area 101 and a border area 102 at least partially surrounding the display area 101; the integrated flexible cover plate 4 includes:

[0062] The cover plate body 1 includes a first surface 100 and a second surface 200 that are opposite to each other along its own thickness direction Y.

[0063] A coating layer 2 is disposed on the first surface 100 of the cover plate body 1. The coating layer 2 includes a light-transmitting coating layer 21 disposed on the first surface 100 corresponding to the display area 101, the light-transmitting coating layer 21 being connected to the cover plate body 1, and a black coating layer 22 disposed on the first surface 100, at least partially surrounding the display area 101 and corresponding to the border area 102, the black coating layer 22 being connected to the cover plate body 1. The black coating layer 22 is integrally connected around the light-transmitting coating layer 21 and along the thickness direction Y of the cover plate body 1. The orthographic projections of the light-transmitting coating layer 21 and the black coating layer 22 onto the cover plate body 1 are both located on the cover plate body 1.

[0064] An optical adhesive layer 3 is disposed on the second surface 200 of the cover plate body 1, and the optical adhesive layer 3 is connected to the cover plate body 1.

[0065] In the integrated flexible cover plate 4 provided in this application embodiment, a light-transmitting coating layer 21 is provided on the first surface 100 of the cover plate body 1 along its own thickness direction Y, corresponding to the display area 101. A black coating layer 22 is provided on the first surface 100 of the cover plate body 1, at least partially surrounding the display area 101 and corresponding to the border area 102. The black coating layer 22 surrounds the light-transmitting coating layer 21 and is integrally connected along the thickness direction Y of the cover plate body 1 to form a coating film layer 2. The coating film layer 2 is also integrally connected with the cover plate body 1. An optical adhesive layer 3 is provided on a second surface 200 opposite to the first surface 100, so that the optical adhesive layer 3 is connected to the cover plate body 1 to form an integrated flexible cover plate 4 with excellent comprehensive performance. This effectively reduces the processes of bonding materials, ink materials and printing ink materials between the coating film layer 2 and the cover plate body 1, as well as the processes of bonding materials and coating film layers, thereby reducing the manufacturing cost of the integrated flexible cover plate due to the yield loss caused by the aforementioned processes, improving the manufacturing efficiency of the integrated flexible cover plate, and reducing the overall thickness of the integrated flexible cover plate.

[0066] It should be noted that the orthographic projections of the light-transmitting coating layer 21 and the black coating layer 22 onto the cover plate body 1 are both located on the cover plate body 1. This means that the orthographic projections of the light-transmitting coating layer 21 and the black coating layer 22 onto the cover plate body 1 are both located on the first surface 100 of the cover plate body 1. Furthermore, the sum of the orthographic projection areas of the light-transmitting coating layer 21 and the black coating layer 22 onto the cover plate body 1 is less than, equal to, or greater than the area of ​​the first surface 100 of the cover plate body 1. Thus, the black coating layer 22, which is provided corresponding to the frame area 102, is provided on the first surface 100 of the cover plate body 1, at least partially surrounding the light-transmitting coating layer 21, which is provided corresponding to the display area 101, forming a coating film layer 2 on the side of the cover plate body 1 facing away from the optical adhesive layer 3. For example, the sum of the projected areas of the light-transmitting coating layer 21 and the black coating layer 22 on the cover plate body 1 is less than the area of ​​the cover plate body 1. The black coating layer 22 does not completely coat the edge of the cover plate body 1 at this point. Specifically, the black coating layer 22 is some distance from the edge of the cover plate body 1 relative to the outer side of the light-transmitting coating layer 21. The portion not covered by the black coating layer 22 can be covered and connected by the housing of the display device. This solution also includes cases where the black coating layer 22 partially surrounds the light-transmitting coating layer 21, such as when the black coating layer 22 is arranged in a semi-circular or two-thirds circular shape around the light-transmitting coating layer 21; or when the light-transmitting coating layer 21 is rectangular, and the black coating layer 22 surrounds the adjacent two or three sides of the light-transmitting coating layer 21; or when it surrounds all four sides of the light-transmitting coating layer 21, but a portion of one side is not covered by the black coating layer. Alternatively, in some embodiments, the sum of the projected areas of the light coating layer 21 and the black coating layer 22 onto the cover plate body 1 is equal to the area of ​​the cover plate body 1, so that the coating film layer 2 is fully connected to the cover plate body 1. In other embodiments, the sum of the projected areas of the light coating layer 21 and the black coating layer 22 onto the cover plate body 1 is greater than the area of ​​the cover plate body 1, that is, the black coating layer 22 protrudes outward along the overall edge of the cover plate body 1 by a certain width, so as to better connect with the cover plate body 1 and improve the connection strength between the cover plate body 1 and the coating film layer 2 as a whole and other components of the display device containing them, as well as the ability to cover the lower structure of the optical adhesive layer 3.

[0067] The integrated flexible cover plate 4 in this application embodiment can be applied to devices that require flexibility and have display functions, including but not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, wearable device display screens, etc.

[0068] In some embodiments, the cover plate body is made of a material with bending performance and high transmittance. The cover plate body needs to meet the following requirements: light transmittance ≥ 98%, bending radius R ≤ 2.0 mm, and bending cycles ≥ 200,000. Using a cover plate body 1 that meets the above requirements enables the integrated flexible cover plate 4 to have good bending performance.

[0069] In some embodiments, the cover body 1 is made of ultra-thin flexible glass, colorless polyimide, polyethylene terephthalate, or a composite material of two or more thereof. The cover body 1 is made of ultra-thin flexible glass, colorless polyimide, polyethylene terephthalate, or a composite material of two or more thereof, utilizing their flexibility and transparency properties. The cover body 1 protects the screen 5 of the display device 6, including the integrated flexible cover 4. For example, the cover body 1 is a composite material of ultra-thin flexible glass and colorless polyimide, with the colorless polyimide located on the side of the ultra-thin flexible glass facing away from the optical adhesive layer 3. Alternatively, the cover body 1 is a composite material of ultra-thin flexible glass and polyethylene terephthalate, with the polyethylene terephthalate located on the side of the ultra-thin flexible glass facing away from the optical adhesive layer 3. Alternatively, the cover plate body 1 can be a composite material made of ultra-thin flexible glass, colorless polyimide, and polyethylene terephthalate, with the colorless polyimide and polyethylene terephthalate sequentially stacked on the side of the ultra-thin flexible glass facing away from the optical adhesive layer 3, or the polyethylene terephthalate and colorless polyimide sequentially stacked on the side of the ultra-thin flexible glass facing away from the optical adhesive layer 3. Using two or more composite materials to make the cover plate body 1 can improve its impact resistance while maintaining good flexibility.

[0070] In some embodiments, the cover body 1 is made of colorless polyimide (i.e., CPI).

[0071] In some embodiments, the thickness of the cover plate body 1 is ≥50μm. Exemplarily, the thickness of the cover plate body 1 is 50μm, 53μm, 55μm, 60μm, 62μm, 64μm, 65μm, 67μm, 70μm, 71μm, 74μm, 77μm, 80μm, 82μm, 85μm, 87μm, 90μm, or 100μm.

[0072] Preferably, in order to improve the impact resistance of the integrated flexible cover plate 4, the cover plate body 1 is made of ultra-thin flexible glass material. Correspondingly, the ultra-thin flexible glass can be any value from 50μm to 75μm.

[0073] In some embodiments, the thickness of the cover plate body 1 is preferably 50 μm to 70 μm. Optionally, the thickness of the cover plate body 1 is 70 μm.

[0074] The cover body 1, made of ultra-thin flexible glass, can effectively improve the impact resistance of the cover assembly, including the integrated flexible cover 4.

[0075] In the integrated flexible cover plate 4 provided in the embodiments of this application, the black coating layer 22 of the coating film layer 2 replaces the ink material printed on the bonding surface of the adhesive material and the protective film layer. This eliminates the need for ink material on the bonding surface of the coating film layer 2 and the process of printing ink material. As a result, the coating film layer 2 can be formed through the coating process and subsequent curing, which can significantly improve the manufacturing efficiency of the integrated flexible cover plate 4 and make the coating film layer 2 and the cover plate body 1 firmly connected.

[0076] In some embodiments, the elastic modulus of the coating layer 2 is less than that of the cover plate body 1. For example, when the coating layer 2 is made of colorless polyimide and the cover plate body 1 is also made of colorless polyimide, since the two materials are the same, in order to make the integrated flexible cover plate 4 have good bending performance, the elastic modulus of the coating layer 2 needs to be less than that of the cover plate body 1, so that the bending radius of the integrated flexible cover plate 4 is smaller and it can be bent.

[0077] In some embodiments, the light-transmitting coating layer 21 is made of at least one or more materials selected from colorless polyimide, polymethyl methacrylate, and thermoplastic polyurethane. In the process of forming the light-transmitting coating layer 21 using multiple materials, the corresponding materials need to be coated and cured layer by layer to form the light-transmitting coating layer 21. Meanwhile, in the integrated flexible cover plate 4 provided in this application embodiment, the coating film layer 2 made of the above-mentioned materials can be effectively bonded to the cover plate body 1, eliminating the need for additional adhesive materials. This saves the thickness space occupied by adhesive materials, effectively reducing the overall thickness of the integrated flexible cover plate 4 and achieving a thinner and lighter integrated flexible cover plate 4.

[0078] In some embodiments, the light-transmitting coating layer 21 is made of colorless polyimide, which can be formed on the first surface 100 of the cover plate body 1 corresponding to the display area 101 by coating.

[0079] In some embodiments, the black coating layer 22 is made of a mixture of black pigment and the material used to make the light-transmitting coating layer 21, so that the black coating layer 22 and the light-transmitting coating layer 21 can be integrally connected to form a coating film layer 2.

[0080] In some embodiments, the black coating layer 22 is made of a mixture of black pigment and light-transmitting coating layer 21, which can make the black coating layer 22 and light-transmitting coating layer 21 have better compatibility and be integrally connected as coating film layer 2, and gaps are not easily generated between the black coating layer 22 and light-transmitting coating layer 21.

[0081] In some embodiments, the thickness of the coating layer 2 is ≤30μm. To ensure the bending performance of the integrated flexible cover plate 4, the thickness of the coating layer 2 needs to be less than or equal to 30μm. For example, the thickness of the coating layer 2 can be 20μm, 22μm, 25μm, 27μm, 28μm, or 30μm.

[0082] Preferably, the thickness of the coating layer 2 is any value between 25 μm and 30 μm.

[0083] Please see Figure 2 , Figure 2 This is a cross-sectional view of the integrated flexible cover plate in another embodiment.

[0084] In some embodiments, such as Figure 2 As shown, the coated film 2 contains 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids 7.

[0085] In the integrated flexible cover plate 4 provided in the embodiments of this application, the inventors of this application have discovered that in order to ensure the bending performance of the integrated flexible cover plate 4, adding a certain amount of C13-C18 long-chain fatty acid 7 to the coating film layer 2 can effectively improve the bending performance of the coating film layer 2, thereby improving the bending performance of the integrated flexible cover plate 4.

[0086] For example, the content of long-chain fatty acid 7 added, based on the mass percentage of the coated film, can be 2 wt.%, 2.2 wt.%, 2.4 wt.%, 2.5 wt.%, 2.7 wt.%, 3.0 wt.%, 3.2 wt.%, 3.5 wt.%, 3.6 wt.%, 3.8 wt.%, 3.9 wt.%, 4.2 wt.%, 4.5 wt.%, 4.8 wt.%, 5.0 wt.%, 5.2 wt.%, 5.5 wt.%, 5.7 wt.%, 5.9 wt.%, 6.0 wt.%, 6.4 wt.%, 6.6 wt.%, 6.8 wt.%, 7.0 wt.%, 7.2 wt.%, 7.5 wt.%, 7.7 wt.%, and 7.9 wt.%.

[0087] Preferably, the content of long-chain fatty acid 7 is 3 wt.% to 6 wt.%, more preferably 3 wt.% to 5 wt.%.

[0088] In some embodiments, the long-chain fatty acid is a C13-C18 long-chain fatty acid 7. Using long-chain fatty acids 7 in this range can effectively improve the bending performance of the coated film layer 2, thereby improving the bending performance of the cover assembly including the integrated flexible cover plate 4.

[0089] In some embodiments, the long-chain fatty acid 7 is selected from one or a combination of several of tridecyl acid, tetradecyl acid, pentadecyl acid, hexadecyl acid, heptadecanyl acid, and octadecyl acid. Using one or a combination of the above-mentioned types of long-chain fatty acid 7 can effectively improve the bending properties of the coated film layer 2. Exemplarily, the C13 to C18 long-chain fatty acid can be tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanyl acid, octadecanoic acid, or octadecanoic acid.

[0090] In some embodiments, the long-chain fatty acid is selected from one or a combination of several of tridecyl acid, tetradecyl acid, and pentadecyl acid. Tetradecyl acid is preferred.

[0091] In the integrated flexible cover plate 4 provided in the embodiments of this application, the use of long-chain fatty acid 7 can increase the lubricity between the polymers forming the coating film 2, reduce the resistance to the relative movement between the polymers, and make the polymers forming the coating film 2 easier to bend, thereby making the cover plate assembly including the integrated flexible cover plate 4 easy to bend as a whole, even though it has good bending performance.

[0092] In some embodiments, the thickness of the optical adhesive layer 3 is ≥25μm, and the optical adhesive layer 3 is used to bond and connect with the parts to be bonded.

[0093] In the integrated flexible cover plate 4 provided in the embodiments of this application, the optical adhesive layer 3 is made of transparent optical adhesive material and can be formed by coating process in one step, thereby saving the time cost of bonding the optical adhesive layer 3 and improving the manufacturing efficiency of the optical adhesive layer 3.

[0094] Preferably, in some embodiments, the thickness of the optical adhesive layer 3 is any value between 25 μm and 50 μm.

[0095] In the integrated flexible cover plate 4 provided in the embodiments of this application, in order to ensure the bending performance of the integrated flexible cover plate 4, the thickness of the optical adhesive layer 3 can be 25μm, 27μm, 28μm, 30μm, 32μm, 35μm, 36μm, 38μm, 40μm, 41μm, 43μm, 45μm, 47μm, or 50μm, for example.

[0096] Understandably, while ensuring the bending performance of the integrated flexible cover plate 4, the thickness of the coating layer 2 and the optical adhesive layer 3 can be adjusted to achieve an overall reduction in the thickness of the integrated flexible cover plate 4. Furthermore, the thickness of the coating layer 2 and the optical adhesive layer 3 can be combined with the type and content of long-chain fatty acids in the coating layer 2 to work together to ensure that the cover plate assembly, including the integrated flexible cover plate, has suitable bending performance. For example, by adjusting the thickness of the coating layer 2 and the optical adhesive layer 3, the thickness of one can be reduced while the thickness of the other is increased, or both can be reduced simultaneously. Alternatively, the thickness of the coating layer 2 can be combined with the type and content of long-chain fatty acids in the coating layer 2, such as increasing the content of long-chain fatty acids and appropriately increasing the thickness of the coating layer, or reducing the thickness of the coating layer while adjusting the combination of the types of long-chain fatty acids. Alternatively, the thickness of the optical adhesive layer 3 can be adjusted in combination with the type and content of long-chain fatty acids in the coating layer 2. For example, the thickness of the optical adhesive layer 3 can be reduced, while the content or combination of long-chain fatty acids in the coating layer 2 can be increased; or the thickness of the optical adhesive layer can be increased, but the content or combination of long-chain fatty acids in the coating layer 2 can be changed. This allows the integrated flexible cover plate 4 to have good bending performance, and its thickness can be reduced as needed. Testing shows that the integrated flexible cover plate 4 can achieve a bending radius ≤1.5mm and a bending cycle ≥200,000 times.

[0097] Please see Figure 3 , Figure 3 This is a flowchart of a method for preparing an integrated flexible cover plate in one embodiment.

[0098] like Figure 3 As shown, an embodiment of the second aspect of this application provides a method for manufacturing an integrated flexible cover plate 4. The integrated flexible cover plate 4 has a display area 101 and a border area 102 that is at least partially disposed around the display area 101. The manufacturing method includes:

[0099] A first liquid paste is applied to the first surface 100 of the cover plate body 1 in the thickness direction Y corresponding to the display area 101, and a second liquid paste is applied to the border area 102 that is provided at least around a portion of the display area 101, so as to obtain a light-transmitting paste layer and a black paste layer on the first surface 100 of the cover plate body 1.

[0100] The light-transmitting paste layer and the black paste layer are cured to obtain a light-transmitting coating layer 21 located in the display area 101 and a black coating layer 22 located in the frame area 102. The light-transmitting coating layer 21 and the black coating layer 22 are integrally connected to form an integral coating film layer 2. The orthographic projection of the light-transmitting coating layer 21 and the black coating layer 22 on the cover plate body 1 is both located on the cover plate body 1.

[0101] A third liquid slurry is applied to the second surface 200 along the thickness direction Y of the cover plate body 1 and opposite to the first surface 100 and then cured to form an optical adhesive layer 3 that is integrally connected with the cover plate body 1, thereby obtaining an integrated flexible cover plate 4.

[0102] In the method for preparing the integrated flexible cover plate 4 provided in the embodiment of the second aspect of this application, a first liquid slurry is directly applied to the first surface 100 of the cover plate body 1 in the thickness direction Y, corresponding to the display area 101, to form a light-transmitting slurry layer. A second liquid slurry is applied to the first surface 100 of the cover plate body 1, corresponding to the frame area 102 at least surrounding a portion of the display area 101, to form a black slurry layer. The light-transmitting slurry layer and the black slurry layer are then cured to solidify the light-transmitting slurry layer into a light-transmitting coating layer 21 and the black slurry layer into a black coating layer 22. The light-transmitting coating layer 21 and the black coating layer 22 are integrally connected to form a coating film layer 2, and the coating film layer 2 and the cover plate body are then bonded together. The body 1 is connected as a whole, which shortens the production time of the coating film 2 and improves the production efficiency of the coating film 2. Then, a third liquid slurry is coated on the second surface 200 along the thickness direction Y of the cover plate body 1 and opposite to the first surface 100 to form an optical adhesive layer. The optical adhesive layer is then cured to form an optical adhesive layer 3. That is, the optical adhesive layer 3 is further made on the second surface 200 of the cover plate body 1 by coating, and the optical adhesive layer 3 and the cover plate body 1 are connected as a whole, saving the production time of the optical adhesive layer 3. This effectively saves the production time of the entire integrated flexible cover plate 4, comprehensively improves the production efficiency of the integrated flexible cover plate 4, and obtains an integrated flexible cover plate 4 with excellent comprehensive performance.

[0103] In the method for preparing the integrated flexible cover plate 4 provided in the embodiment of the second aspect of this application, by adopting a coating process, the bonding process is eliminated, which effectively reduces the amount of adhesive and ink materials between the coating film layer 2 and the cover plate body 1, as well as the steps of printing ink materials on the original protective film layer, and the time costs brought about by the steps of bonding adhesive materials and bonding protective film layers. This reduces the manufacturing cost of the integrated flexible cover plate 4 due to the yield loss caused by the aforementioned processes, improves the manufacturing efficiency of the integrated flexible cover plate, and at the same time prevents the yield loss caused by the use of multi-step bonding processes, saving material costs caused by the yield loss of the multi-step bonding process in the production of the integrated flexible cover plate.

[0104] In the method for preparing the integrated flexible cover provided in the second aspect of this application, both the coating film layer 2 and the optical adhesive layer 3 can be formed by coating, that is, the cover assembly including the integrated flexible cover 4 is completed. Compared with the use of multiple bonding processes, the time for manufacturing the integrated flexible cover is effectively saved, the overall manufacturing efficiency of the integrated flexible cover is improved, and the comprehensive performance of the integrated flexible cover is improved.

[0105] In some embodiments, curing the light-transmitting paste layer and the black paste layer includes simultaneously curing the light-transmitting paste layer located in the display area and the black paste layer located in the frame area to simultaneously obtain the light-transmitting coating layer 21 and the black coating layer 22, thereby forming a coating film layer 2 of the same thickness from the light-transmitting coating layer 21 and the black coating layer 22.

[0106] In some embodiments, obtaining a translucent paste layer and a black paste layer, and performing a curing process on the translucent paste layer and the black paste layer, includes: first forming a translucent paste layer, performing a pre-curing treatment on the translucent paste layer to initially cure the translucent paste layer and prevent deformation of the translucent paste layer; then forming a black paste layer, performing a pre-curing treatment on the black paste layer to prevent deformation of the black paste layer; and finally performing a final curing treatment on the pre-cured translucent paste layer and the black paste layer to obtain a translucent coating layer 21 and a black coating layer 22, so that the translucent coating layer 21 and the black coating layer 22 are integrally connected to form a coating film layer 2. This manufacturing process can improve the regularity of the coating film layer 2, preventing deformation of the coating film layer 2 due to deformation of the translucent coating layer 21, the black coating layer 22, or both, thereby giving the coating film layer 2 a relatively uniform surface flatness and obtaining a regular coating film layer 2.

[0107] In some embodiments, obtaining a translucent slurry layer and a black slurry layer, and performing a curing process on the translucent slurry layer and the black slurry layer, includes: first forming a black slurry layer, performing a pre-curing process on the black slurry layer to initially cure it; then forming a translucent slurry layer, performing a pre-curing process on the translucent slurry layer to initially cure it; and finally curing the pre-cured translucent slurry layer and the black slurry layer to integrally connect the translucent coating layer 21 and the black coating layer 22 into a coating film layer 2. Specifically, first applying a second liquid slurry to form a black slurry layer and pre-curing it can form an annular, initially cured black slurry layer around the corresponding display area 101. The annular layer has a groove space in the middle to accommodate the first liquid slurry to be coated, so that the first liquid slurry can be coated to form the translucent coating layer 21. This effectively prevents deformation of the translucent coating layer 21 and facilitates the connection of the translucent coating layer 21 and the black coating layer 22 into one piece during the final curing process. During the application of the second liquid slurry, a suitable mold can be used to form a ring-shaped black adhesive layer.

[0108] In some embodiments, the first liquid slurry is at least one of polyimide slurry, polymethyl methacrylate, and thermoplastic polyurethane, so as to take advantage of the coatable properties of these materials, the first liquid slurry and the second liquid slurry are respectively coated on the first surface 100 of the cover plate body 1 along its own thickness direction, corresponding to the display area 101 and the frame area 102, and cured to form a coating film layer 2.

[0109] Optionally, the coating thickness of the first liquid slurry is 15 μm to 32 μm. For example, the coating thickness of the first liquid slurry can be 16 μm, 18 μm, 20 μm, 21 μm, 23 μm, 25 μm, 27 μm, 28 μm, 30 μm, or 31 μm. Preferably, it is any value selected from 27 μm to 32 μm or 20 μm to 25 μm.

[0110] Preferably, the first liquid slurry is a colorless polyimide slurry, which can better bond with the cover plate body 1.

[0111] In some embodiments, the second liquid slurry is prepared by mixing black pigment with the first liquid slurry, specifically by mixing with at least one material selected from colorless polyimide, polymethyl methacrylate, and thermoplastic polyurethane. This allows a black coating layer 22 to be formed on the first surface 100 of the cover plate body 1 in the frame area 102 through a coating process. The light-transmitting coating layer 21 and the black coating layer 22 are then integrally connected to form a coating film layer 2, effectively protecting the cover plate body 1. It is understood that the second liquid slurry may also be made from other adhesive materials different from the first liquid slurry, with the addition of black pigment. However, good adhesion and compatibility with the cover plate body 1 and the light-transmitting coating layer 21 must be considered to ensure that the black coating layer 22 and the light-transmitting coating layer 21 can be integrally connected to form the coating film layer 2. This application does not explicitly limit the adhesive material corresponding to the second liquid slurry.

[0112] In some preferred embodiments, the second liquid slurry is made by mixing black pigment with the same first liquid slurry used in the translucent coating layer. For example, when the first liquid slurry forming the translucent coating layer 21 is colorless polyimide, the second liquid slurry forming the black coating layer 22 is also made of colorless polyimide with added black pigment, so as to better bond the translucent coating layer 21 and the black coating layer 22 using the same material. It is understood that, since the black coating layer 22 does not need to consider its impact on the displayed information, it can also be made of ordinary polyimide material with added black pigment. For example, both the first and second liquid slurries forming the translucent coating layer 21 and the black coating layer 22 can be made using polymethyl methacrylate or thermoplastic polyurethane with added black pigment.

[0113] In some embodiments, both the translucent paste layer and the black paste layer can be pre-cured and finally cured using a high-temperature baking process. The high-temperature baking process refers to baking at a temperature of 200℃ to 400℃. Exemplarily, the baking temperature can be 210℃, 220℃, 240℃, 245℃, 270℃, 280℃, 300℃, 310℃, 320℃, 330℃, 335℃, 350℃, 360℃, 375℃, 380℃, 385℃, 390℃, 395℃, or 398℃.

[0114] In some embodiments, the black pigment includes one or more of carbon black nanoparticles, plant carbon black, iron oxide black, and fumed silica nanoparticles. The black pigment is added to a mixture of materials used to form the transparent coating layer 21 to form a second liquid slurry, namely the black slurry that forms the black coating layer 22.

[0115] The black pigment is carbon black nanoparticles, which can form a black slurry with polyimide to ensure that the black coating layer 22 formed after the black slurry, i.e. the second liquid slurry, is cured meets the usage requirements of the integrated flexible cover plate 4 and covers the parts of the frame area 102 that need to be covered.

[0116] In some embodiments, the average particle size of carbon black nanoparticles, plant carbon black, iron oxide black, and fumed silica nanoparticles is 7 nm to 200 nm.

[0117] For example, the average particle size of the above-mentioned black pigments can be 10nm, 12nm, 15nm, 20nm, 25nm, 28nm, 30nm, 35nm, 40nm, 42nm, 45nm, 48nm, 50nm, 55nm, 58nm, 60nm, 64nm, 66nm, 70nm, 72nm, 75nm, 80nm, 90nm, 100nm, 120nm, 150nm, 180nm, or 190nm.

[0118] Preferably, the average particle size of the above-mentioned black pigments is 100nm to 150nm.

[0119] In some embodiments, the black pigment includes carbon black nanoparticles, iron oxide black, and plant carbon black in a mass ratio of (3-5):(2-6):(3-4).

[0120] In some embodiments, the black pigment includes carbon black nanoparticles, iron oxide black, and fumed silica nanoparticles in a mass ratio of (3-5):(2-4):(3-6).

[0121] In the preparation method of this application embodiment, fumed silica nanoparticles have the characteristics of high specific surface area and porosity, and their surface contains a large number of silanol groups. The average particle size of fumed silica nanoparticles is 7nm to 200nm. Plant carbon black can be obtained from the high-temperature carbonization of plants such as coconut shells, coconut fibers, and bamboo charcoal. It has the characteristics of being porous, containing hydroxyl and / or carboxyl polar groups, and having strong adsorption properties. It can be combined with carbon black nanoparticles, iron oxide black, and other substances with high hiding power but lacking polar groups on the surface, so that the black coating layer 22 formed by the second liquid slurry has high black hiding power and good compatibility with polyimide or colorless polyimide, polymethyl methacrylate, and thermoplastic polyurethane. Using the black pigment of the above ratio, the black coating layer 22 can achieve a light transmittance ≤0.01, or an OD (Optical Density) value greater than or equal to 2. The larger the OD value, the less light is transmitted, indicating that the black coating layer 22 has a stronger hiding power.

[0122] In some embodiments, the coating thickness of the second liquid slurry is 15 μm to 35 μm. Exemplarily, the coating thickness of the first liquid slurry can be 16 μm, 18 μm, 20 μm, 21 μm, 23 μm, 25 μm, 27 μm, 28 μm, 30 μm, or 31 μm. Preferably, it is any value selected from 20 μm to 25 μm or 27 μm to 32 μm.

[0123] In the method for preparing the integrated flexible cover provided in the second aspect of this application, a coating film layer 2 is formed by directly coating the first surface 100 of the cover body 1 along its own thickness direction. This makes the coating film layer 2 and the cover body 1 more firmly and directly connected as one. Compared with printing ink and adopting a multi-stage bonding process, this method can effectively reduce the problem of printing ink falling off and peeling off from the cover body 1 during high-temperature reliability testing of the integrated flexible cover 4. The peel strength between the coating film layer 2 and the cover body 1 during high-temperature reliability testing is increased to 3B, which is measured according to commonly used testing methods.

[0124] In some embodiments, both the first liquid slurry and the second liquid slurry contain 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids. The presence of 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids in the first liquid slurry ensures good bending performance of the formed transparent coating layer 21, thereby giving the cover assembly including the integrated flexible cover plate good bending performance as well. The presence of 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids in the second liquid slurry allows the black coating layer 22 to adapt to the bending performance of the transparent coating layer 21, preventing the black coating layer 22 from separating from the transparent coating layer 21 or affecting the overall connectivity when the transparent coating layer 21 is in a bent state. The types and contents of long-chain fatty acids have been described above and will not be repeated here.

[0125] In some embodiments, the translucent paste layer undergoes pre-curing and final curing treatment using a high-temperature baking process. Both the translucent paste layer and the black paste layer can be pre-cured using a high-temperature baking process.

[0126] In some embodiments, the third liquid slurry is an optically transparent adhesive material, which allows the optical adhesive layer 3 to be formed on the second surface 200 of the cover plate body 1 along its own thickness direction and opposite to the first surface by coating, so that the optical adhesive layer 3 and the cover plate body are also connected as one, and then the integrated flexible cover plate 4 is bonded to the screen body 5 by the optical adhesive layer 3, without affecting the information content displayed on the screen body 5 of the display device 6 in the display area 101.

[0127] In the integrated flexible cover plate 4 provided in the embodiments of this application, the coating thickness of the third liquid slurry is slightly greater than the thickness of the optical adhesive layer 3, i.e., ≥26μm, which is approximately 1-2μm greater than the thickness of the optical adhesive layer, in order to eliminate the shrinkage and thinning of the optical adhesive layer caused by curing. Exemplarily, the coating thickness of the third liquid slurry can be 26μm, 28μm, 29μm, 3μm, 33μm, 36μm, 37μm, 39μm, 41μm, 42μm, 44μm, 46μm, 48μm, or 51μm.

[0128] In some embodiments, in the step of curing the third liquid slurry, ultraviolet light curing or high-temperature thermal curing can be used to cure the third liquid slurry to form the optical adhesive layer 3. High-temperature thermal curing refers to curing at a temperature of 80°C to 200°C.

[0129] In the method for preparing the integrated flexible cover plate provided in the second aspect of this application, both the coating film layer 2 and the optical adhesive layer 3 can be formed by coating. The coating thickness of the coating film layer 2 and the optical adhesive layer 3 can be adjusted separately according to the usage requirements, thereby obtaining an integrated flexible cover plate 4 with different coating film layers 2 and optical adhesive layers 3, that is, obtaining an integrated flexible cover plate 4 with reduced thickness. This reduces the overall thickness of the cover plate assembly including the integrated flexible cover plate 4 by up to 50 μm, achieving the goal of making the integrated flexible cover plate 4 and the cover plate assembly thinner and lighter.

[0130] Furthermore, the integrated flexible cover plate preparation method provided by the embodiment of the second aspect of this application can be used to prepare the coating film layer 2 and the optical adhesive layer 3 at the same manufacturer through a coating process, which can effectively improve the manufacturing efficiency of the integrated flexible cover plate 4, thereby improving the manufacturing efficiency of the cover plate assembly including the integrated flexible cover plate 4, and saving the time cost and material cost caused by yield loss in the production of multiple bonding processes.

[0131] An embodiment of the third aspect of this application provides a display device 6, including: an integrated flexible cover plate 4 provided in the first aspect embodiment above, and a screen body 5, the screen body 5 being connected to the side of the optical adhesive layer 3 facing away from the cover plate body 1.

[0132] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a display device in one embodiment.

[0133] like Figure 4 As shown, the display device 6 provided in the third aspect embodiment of this application includes the integrated flexible cover plate 4 and screen body 5 provided in the first aspect embodiment. Connecting the screen body 5 to the side of the optical adhesive layer 3 away from the cover plate body 1 reduces the overall thickness of the display device 6 by up to 50 μm, thus achieving the same goal of thinness and lightness. Figure 4 In the coating layer 2, there are no long-chain fatty acids.

[0134] Please see Figure 5 , Figure 5 This is a schematic diagram of the display device in another embodiment. (See diagram below.) Figure 5 As shown, the display device 6 provided in the third aspect embodiment of this application includes the integrated flexible cover plate 4 and screen body 5 provided in the first aspect embodiment. By connecting the screen body 5 to the side of the optical adhesive layer 3 away from the cover plate body 1, the overall thickness of the display device 6 can be reduced by up to 50 μm, thus achieving the same goal of thinning the display device 6. The coating layer 2 contains long-chain fatty acids.

[0135] In the display device 6 provided in the third aspect embodiment of this application, the optical adhesive layer 3 is used to bond with the screen body 5. The screen body 5 can be an LED (Light Emitting Diode) screen body or an OLED (Organic Light Emitting Diode) screen body commonly used in the art, which will not be described in detail here.

[0136] It should be noted that, in Figure 2 and Figure 5 In this context, the term "particulate long-chain fatty acid 7" simply indicates that the coating layer 2 contains long-chain fatty acids. In the actual product, it is not in particulate form, but rather appears colorless and transparent, similar to the light-transmitting coating layer 21.

[0137] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An integrated flexible cover plate, characterized in that, The integrated flexible cover plate has a display area and a border area that is at least partially surrounding the display area; The integrated flexible cover plate includes: A cover plate body, the cover plate body including a first surface and a second surface that are opposite to each other along its own thickness direction; A coating layer is disposed on a first surface of the cover plate body. The coating layer includes a light-transmitting coating layer disposed on the first surface corresponding to the display area, the light-transmitting coating layer being connected to the cover plate body, and a black coating layer disposed on the first surface, at least partially surrounding the display area and corresponding to the border area, the black coating layer being connected to the cover plate body. The black coating layer is integrally connected around the light-transmitting coating layer and along the thickness direction of the cover plate body itself. The orthogonal projections of the light-transmitting coating layer and the black coating layer onto the cover plate body are both located on the cover plate body. An optical adhesive layer is disposed on the second surface of the cover plate body, and the optical adhesive layer is connected to the cover plate body.

2. The integrated flexible cover plate according to claim 1, characterized in that, The elastic modulus of the coating film is less than that of the cover plate body.

3. The integrated flexible cover plate according to claim 1 or 2, characterized in that, The cover plate body is made of a material with bending performance and high transmittance. The cover plate body needs to meet the following requirements: light transmittance ≥ 98%, bending radius R ≤ 2.0 mm, and bending times ≥ 200,000 times. Preferably, the cover plate body is made of ultra-thin flexible glass, colorless polyimide, polyethylene terephthalate, or a composite material of two or more. The thickness of the cover plate body is ≥50μm; Preferably, the thickness of the cover plate body is 50μm to 70μm; Preferably, the cover plate body is made of ultra-thin flexible glass; Preferably, the thickness of the ultrathin flexible glass is 50μm to 70μm; Preferably, the thickness of the coating layer is ≤30μm; Preferably, the coated film contains 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids; The thickness of the optical adhesive layer is ≥25μm; Preferably, the thickness of the optical adhesive layer is any value between 25 μm and 50 μm; Preferably, both the cover plate body and the coating film are made of colorless polyimide, and the elastic modulus of the coating film is less than that of the cover plate body.

4. A method for manufacturing an integrated flexible cover plate, the integrated flexible cover plate having a display area and a border area at least partially surrounding the display area, characterized in that, The preparation method includes: A first liquid slurry is applied to the first surface of the cover plate body in the thickness direction corresponding to the display area, and a second liquid slurry is applied to the frame area that is at least surrounding a portion of the display area, to obtain a light-transmitting slurry layer and a black slurry layer located on the first surface of the cover plate body. The light-transmitting paste layer and the black paste layer are cured to obtain a light-transmitting coating layer located in the display area and a black coating layer located in the frame area. The light-transmitting coating layer and the black coating layer are integrally connected to form an integral coating film layer. The orthogonal projections of the light-transmitting coating layer and the black coating layer on the cover plate body are both located on the cover plate body. A third liquid slurry is applied to a second surface of the cover plate body that is opposite to the first surface along its own thickness direction and then cured to form an optical adhesive layer that is integrally connected with the cover plate body, thereby obtaining an integrated flexible cover plate.

5. The preparation method according to claim 4, characterized in that, The curing process for the light-transmitting paste layer and the black paste layer includes: simultaneously curing the light-transmitting paste layer located in the display area and the black paste layer located in the border area; or... Preferably, obtaining the translucent paste layer and the black paste layer, and performing a curing treatment on the translucent paste layer and the black paste layer, includes: first forming the translucent paste layer, performing a pre-curing treatment on the translucent paste layer to initially cure it; then forming the black paste layer, performing a pre-curing treatment on the black paste layer to initially cure it; and finally performing a final curing treatment on the pre-cured translucent paste layer and the black paste layer to integrally connect the translucent coating layer and the black coating layer into a coating film layer; or, The process of obtaining the translucent slurry layer and the black slurry layer, and curing the translucent slurry layer and the black slurry layer, includes: first forming the black slurry layer, then performing a pre-curing treatment on the black slurry layer to allow it to initially cure; then forming the translucent slurry layer, performing a pre-curing treatment on the translucent slurry layer to allow it to initially cure; and finally performing a final curing treatment on the pre-cured translucent slurry layer and the black slurry layer to integrally connect the translucent coating layer and the black coating layer into a coating film layer. Preferably, both the translucent paste layer and the black paste layer can be pre-cured and finally cured using a high-temperature baking process; Preferably, in the step of curing the third liquid slurry, ultraviolet light curing or high-temperature thermal curing is used to cure the third liquid slurry.

6. The preparation method according to claim 4 or 5, characterized in that, The first liquid slurry is selected from at least one of colorless polyimide, polymethyl methacrylate, and thermoplastic polyurethane; and / or, The second liquid slurry is made by mixing a black pigment with at least one material selected from colorless polyimide polymethyl methacrylate and thermoplastic polyurethane; and / or, The third liquid slurry is an optically transparent adhesive material; Preferably, the first liquid slurry is a colorless polyimide slurry; Preferably, the second liquid slurry is prepared by mixing black pigment with the same first liquid slurry that forms the light-transmitting coating layer; Preferably, the black pigment includes one or more of the following: carbon black nanoparticles, plant-based carbon black, iron oxide black, and fumed silica nanoparticles.

7. The preparation method according to claim 6, characterized in that, The black pigment comprises carbon black nanoparticles, iron oxide black, and plant-based carbon black in a mass ratio of (3-5):(2-6):(3-4); or, The black pigment comprises carbon black nanoparticles, iron oxide black, and fumed silica in a mass ratio of (3-5):(2-4):(3-6).

8. The preparation method according to claim 4 or 5, characterized in that, Both the first liquid slurry and the second liquid slurry contain 2 wt.% to 8 wt.% of C13-C18 long-chain fatty acids.

9. The preparation method according to claim 8, characterized in that, The long-chain fatty acid is selected from one or more combinations of tridecyl acid, tetradecyl acid, pentadecyl acid, hexadecyl acid, heptadecanyl acid, and octadecyl acid; Preferably, the long-chain fatty acid is selected from one or more of tridecyl acid, tetradecyl acid, and pentadecyl acid.

10. A display device, characterized in that, include: The integrated flexible cover plate is the integrated flexible cover plate as described in any one of claims 1-3; as well as, The screen body is connected to the side of the optical adhesive layer that is away from the cover plate body.

Images