Cover plate and display module

Abstract

The application provides a cover plate, comprising a substrate, the substrate has a middle area and a peripheral edge area, the peripheral edge area surrounds the periphery of the middle area, the cover plate further comprises a light shielding layer, the light shielding layer is located at the peripheral edge area on one side of the substrate, the cover plate further comprises a first film layer, the first film layer is located on the side of the light shielding layer away from the substrate, the orthographic projection of the first film layer on the substrate covers the orthographic projection of the middle area and the light shielding layer on the substrate, the side surface of the first film layer close to the light shielding layer is matched with the shape of the surface of the light shielding layer and the substrate close to the first film layer, and the side surface of the first film layer away from the light shielding layer is flat. The fitting surface of the cover plate and the screen is flat, the light shielding layer gap can be eliminated, thereby solving the fitting bubble caused by the insufficient overlap amount of the transparent optical adhesive under the narrow frame and the light shielding layer gap when the cover plate is fitted with the screen, the fitting surface of the first film layer and the screen in the double-fold area tends to be flat, and the risk of the screen peripheral edge fitting bubble using the cover plate is eliminated.

Description

Technical Field

[0001] This invention belongs to the field of display technology, specifically relating to a cover plate and a display module. Background Technology

[0002] Curved edges are currently the mainstream design for display products (such as mobile phones). As the bottom bezel (i.e., the side bezel) of display products becomes narrower, the combination of curved edges and narrow bezels has become the mainstream demand for display products.

[0003] Currently, display products typically have a cover plate attached to the display side of the display substrate. When the specifications are strict, such as the edges being curved, it is difficult to achieve a perfect fit between the display substrate and the cover plate during the production process. The main defect is that air bubbles are easily formed between the edges of the display substrate and the edges of the cover plate. Summary of the Invention

[0004] This invention addresses the problem of bonding bubbles easily occurring between the periphery of the display substrate and the periphery of the cover plate. It provides a cover plate with a smooth bonding surface to the screen, which can eliminate gaps in the light-shielding layer. This solves the bonding bubble problem caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer under the narrow bezel and gaps in the light-shielding layer when the cover plate is bonded to the screen, thus eliminating the risk of bonding bubbles around the periphery of the screen using this cover plate.

[0005] This invention provides a cover plate, including a substrate, the substrate having a central region and peripheral edge regions, the peripheral edge regions surrounding the central region.

[0006] The cover plate further includes a light-shielding layer located at the periphery of one side of the substrate.

[0007] The cover plate further includes a first film layer located on the side of the light-shielding layer away from the substrate. The orthographic projection of the first film layer on the substrate covers the middle area and the orthographic projection of the light-shielding layer on the substrate. The surface of the first film layer near the light-shielding layer is adapted to the shape of the surface of the light-shielding layer and the substrate near the first film layer, and the surface of the first film layer away from the light-shielding layer is flat.

[0008] Optionally, the central area is a planar area, the surrounding edge area is an arc-shaped area, and the arc-shaped area bends towards the side where the first film layer is located;

[0009] The thickness of the first film layer located in the surrounding edge region gradually decreases in the direction away from the center region.

[0010] Optionally, the surrounding edge area includes a double-fold area, which is a region connecting adjacent two side edge areas, and the adjacent two side edge areas have different curvature directions.

[0011] The first film layer located in the bifold region, along any cross-section near its starting point in the middle region and away from the middle region, is divided into n equal parts by n-1 equal division points from its starting point to its ending point.

[0012] At the bending point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is D1.

[0013] At the cutoff point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is Dn+1.

[0014] At any one of the n-1 equally spaced points, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is:

[0015]

[0016] Wherein, n-1 represents the (n-1)th division point, n-1 = 2, 3, 4...(n-1), and n is an integer; the 2nd to (n-1)th division points are successively moved away from the starting point of the bend.

[0017] Optionally, on any cross-section of the first film layer located in the bifold region, passing through its bend inlet near the middle region and along a direction away from the middle region, the first film layer is divided into 10 equal parts from its bend inlet to its end point by 9 equal division points.

[0018] At the bending point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is D1.

[0019] At the cutoff point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is D11.

[0020] At any one of the nine equally spaced points, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is:

[0021] Dn = D1 - (n-1) * (D1 - D11) / 10;

[0022] Where n represents the nth division point, n = 2, 3, 4...9, and n is an integer; the 2nd to 9th division points are successively moved away from the starting point of the bend.

[0023] Optionally, D1 ranges from 20 to 50 μm, and Dn+1 ranges from 15 to 20 μm.

[0024] Optionally, the thickness of the first film layer located in the surrounding edge region ranges from 1 to 50 μm.

[0025] Optionally, the thickness of the first film layer located in the intermediate region is uniform;

[0026] The thickness of the first film layer located in the intermediate region ranges from 20 to 50 μm.

[0027] Optionally, the material of the first film layer includes any one of polymethyl methacrylate, polycarbonate, polyimide, polyethylene terephthalate, and polystyrene;

[0028] Alternatively, the material of the first film layer may also include an antistatic material.

[0029] The present invention also provides a method for preparing the above-mentioned cover plate, comprising: printing a light-shielding layer on one side of a substrate;

[0030] The first film layer is prepared on the substrate after the above steps are completed using an injection molding process.

[0031] The present invention also provides a display module, including a display panel and the aforementioned cover plate.

[0032] The cover plate is fitted onto the display side of the display panel.

[0033] The beneficial effects of the present invention are as follows: The cover plate provided by the present invention adapts the shape of the surface of the first film layer near the light-shielding layer to the surface of the light-shielding layer and the substrate near the first film layer. The first film layer can effectively fill the gap formed between the light-shielding layer and the substrate, thereby eliminating the gap of the light-shielding layer by covering the light-shielding layer with the first film layer. By making the surface of the first film layer away from the light-shielding layer flat, the bonding surface between the cover plate and the screen is flat, thereby solving the bonding bubbles caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer under the narrow bezel and the gap of the light-shielding layer when the cover plate is bonded to the screen, and eliminating the risk of bonding bubbles around the edges of the screen using this cover plate.

[0034] The display module provided by the present invention, by adopting the cover plate in the above embodiments, makes the bonding surface between the cover plate and the display panel flat, thereby solving the bonding bubbles caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer under the narrow bezel and the discontinuity of the light-shielding layer when the cover plate and the display panel are bonded, and eliminating the risk of bonding bubbles around the edges of the display module using this cover plate. Attached Figure Description

[0035] Figure 1a This is a top view of the screen structure in the disclosed technology;

[0036] Figure 1b For along Figure 1a Schematic diagram of the structure along the AA section line;

[0037] Figure 1c For along Figure 1a Schematic diagram of the structural cross-section along the BB section line;

[0038] Figure 1d For along Figure 1a Schematic diagram of the structure along the CC and DD sections;

[0039] Figure 1e For along Figure 1a Schematic diagram of the structural cross-section of the EE section line;

[0040] Figure 1f For along Figure 1a Schematic diagram of the structural cross-section along the FF section line;

[0041] Figure 2a This is a top view schematic diagram of the display module structure in an embodiment of the present invention;

[0042] Figure 2b For along Figure 2a A structural cross-sectional view of the cover plate along section line AA'.

[0043] Figure 2c For along Figure 2a A structural cross-sectional view of the cover plate along the BB' section line;

[0044] Figure 2d For along Figure 2a A structural cross-sectional view of the cover plate along the CC' and DD' sections;

[0045] Figure 2e For along Figure 2a A structural cross-sectional view of the cover plate along the EE' section line;

[0046] Figure 2f For along Figure 2a A structural cross-sectional view of the cover plate along the FF' section line;

[0047] Figure 3a This is a schematic diagram illustrating the division of the double-folded area of ​​the cover plate into six equal parts in an embodiment of the present invention;

[0048] Figure 3b For the edge of the cover plate Figure 3a A schematic diagram of the cross section of any bisector in the middle;

[0049] Figure 4a As described in the embodiments of the present invention, along Figure 2a A cross-sectional view of the display module with the EE' section line in the middle;

[0050] Figure 4b As described in the embodiments of the present invention, along Figure 2a A cross-sectional view of the display module with the FF' section line.

[0051] The reference numerals in the attached figures are:

[0052] 1. Substrate; 101. Middle area; 102. Surrounding edge area; 103. Double-folded area; 2. Light-shielding layer; 3. First film layer; 4. Display screen; 5. Polarizing film; 6. Heat dissipation film; 7. Transparent optical adhesive; 8. Screen; 9. Display substrate; 10. Cover plate; 11. Ink. Detailed Implementation

[0053] To enable those skilled in the art to better understand the technical solution of the present invention, a cover plate and a display module of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] In publicly available technologies, such as Figures 1a-1f As shown, screen 8 with curved edges 102 is more popular. However, the curved edges 102 pose significant challenges to screen 8 production, primarily due to issues such as bubbles, wrinkles, and cracks in the double-fold area 103. The double-fold area 103 refers to the transition section at the four corners of screen 8 where adjacent curved edges (such as the long and short curved edges) meet. Figure 1a The four corner shaded areas are shown. Since one of the two adjacent curved edges bends along the X direction and the other bends along the Y direction, the double-fold area 103 has both bending along the X direction and bending along the Y direction.

[0055] Currently, screen 8, in addition to its curved edges, also features an extremely narrow bottom bezel (i.e., a bonded side bezel). Screen 8 is typically formed by attaching a cover plate 10 to the display side of the display substrate 9. The cover plate 10 and the display substrate 9 are bonded together using transparent optical adhesive (OCA) 7. The edge area 102 of the cover plate 10 near the display substrate 9 is printed with ink 11. During bonding, a gap is formed between the edge of the ink 11 and the cover plate 10. Insufficient overlap between the ink 11 and the transparent optical adhesive 7 can easily lead to gaps at the ink gap locations, resulting in bonding air bubbles at the overlapping edges of the ink 11 and the transparent optical adhesive 7 after the cover plate 10 and the display substrate 9 are bonded.

[0056] Currently, in the verification of a 1.0mm wide bottom bezel on a screen 8 with curved edges 102, the redundancy in the double-fold area of ​​screen 8 exceeds 0.1mm, and the overlap between the transparent optical adhesive 7 and the ink 11 on the bottom bezel of screen 8 is less than 300μm. This makes it impossible to simultaneously resolve the bonding bubbles in both the bottom bezel and the double-fold area 103 at the four corners. Redundancy refers to the difference in arc length between the curved and flattened states of the double-fold area of ​​screen 8. The greater the redundancy, the greater the compression of the display substrate 9 after the cover plate 10 is bonded, and the higher the risk of bubbles, wrinkles, and cracks. Redundancy is a crucial parameter for assessing the bonding difficulty of screen 8 with curved edges 102.

[0057] In related technologies, for screens with curved edges and narrow bezels, there are two main solutions to address the bonding bubbles in both the double-fold area and the narrow bezel: First, adjusting the debubbling parameters (such as pressure and temperature) after cover plate bonding without changing the screen structure design. Verification results show that this method cannot simultaneously resolve bonding bubbles in both the double-fold area and the narrow bezel for screens with significant edge curvature (e.g., double-fold area redundancy greater than 0.1mm). Second, increasing the thickness of the transparent optical adhesive from 150μm to over 200μm allows for greater deformation, resulting in a flatter double-fold area bond, reducing bending stress and mitigating bonding risks between the display substrate and the cover plate. Verification results show that increasing the thickness of the transparent optical adhesive can simultaneously resolve bonding bubbles in both the double-fold area and the narrow bezel, but this results in poor molding quality, leading to a poor screen appearance that is unacceptable to customers. It also increases the screen thickness, impacting overall device space.

[0058] Therefore, while maintaining the same screen thickness, it is still necessary to seek further solutions to address both the bonding bubbles in the dual-fold area and the bonding bubbles around the narrow bezel.

[0059] To address the aforementioned problems in the prior art, embodiments of the present invention provide a cover plate, such as... Figures 2a-2f As shown, the cover plate includes a substrate 1, which has a central region 101 and a peripheral edge region 102. The peripheral edge region 102 surrounds the periphery of the central region 101. The cover plate also includes a light-shielding layer 2, which is located on the peripheral edge region 102 on one side of the substrate 1. The cover plate also includes a first film layer 3, which is located on the side of the light-shielding layer 2 away from the substrate 1. The orthographic projection of the first film layer 3 on the substrate 1 covers the central region 101 and the orthographic projection of the light-shielding layer 2 on the substrate 1. The surface of the first film layer 3 near the light-shielding layer 2 is adapted to the shape of the light-shielding layer 2 and the surface of the substrate 1 near the first film layer 3, and the surface of the first film layer 3 away from the light-shielding layer 2 is flat.

[0060] When the cover plate is bonded to the screen, the first film layer 3 is bonded to the display side surface of the screen using transparent optical adhesive. The light-shielding layer 2 can be made of ink, and it is used to block the non-display edges of the screen using the cover plate to prevent light leakage around the edges. The substrate 1 can be a glass substrate or a substrate of other materials, such as PC (polycarbonate), transparent PI (polyimide), PET (polyethylene terephthalate), PS (polystyrene), etc.

[0061] By adapting the surface of the first film layer 3 near the light-shielding layer 2 to the shape of the light-shielding layer 2 and the surface of the substrate 1 near the first film layer 3, the first film layer 3 can effectively fill the gap formed between the light-shielding layer 2 and the substrate 1. Thus, by covering the light-shielding layer 2 with the first film layer 3, the gap of the light-shielding layer 2 is eliminated. By making the surface of the first film layer 3 away from the light-shielding layer 2 flat, the bonding surface between the cover plate and the screen is flat. This solves the bonding bubble caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer 2 under the narrow bezel and the gap of the light-shielding layer 2 when the cover plate is bonded to the screen, and eliminates the risk of bonding bubbles around the edges of the screen using this cover plate.

[0062] Optionally, the middle region 101 is a planar region, and the surrounding edge regions 102 are curved regions, with the curved surfaces curving towards the side where the first film layer 3 is located; the thickness of the first film layer 3 located in the surrounding edge regions 102 gradually decreases in the direction away from the middle region 101.

[0063] The screen using this cover plate also has curved edges, curving from the display side to the non-displaying back side. By gradually thinning the thickness of the first film layer 3 located in the edge area 102 away from the center area 101, the redundancy of the screen in the edge area 102 can be reduced when the cover plate is bonded to the screen, thus reducing the difficulty of bonding the cover plate to the edge area of ​​the screen. At the same time, the first film layer 3 can eliminate the gap in the light-shielding layer 2, thereby solving the bonding bubbles caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer 2 under the narrow bezel and the gap in the light-shielding layer 2 when bonding the cover plate to the screen, eliminating the risk of bonding bubbles, wrinkles, cracks, etc. in the edge area of ​​the screen using this cover plate.

[0064] Optionally, the perimeter region 102 includes a double-fold region 103, which is a region connecting adjacent side edge regions. The bending directions of adjacent side edge regions are different. On any cross section of the first film layer 3 located in the double-fold region 103, passing through its bending point P near the middle region 101 and along the direction away from the middle region 101, the first film layer 3 is divided into n equal parts through n-1 equal division points from its bending point P to its termination point Q. At the bending point P, the shortest distance between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 is D1. At the termination point Q, the shortest distance between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 is Dn+1. At any one of the n-1 equal division points, the shortest distance between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 is:

[0065]

[0066] Where n-1 represents the (n-1)th division point, n-1 = 2, 3, 4...(n-1), and n is an integer; the 2nd to (n-1)th division points move away from the starting point P in turn.

[0067] The cover plate is a rounded rectangle. The double-fold area 103 refers to the transition section at the four corners of the cover plate where adjacent curved edges (such as the long curved side and the short curved side) meet. Figure 2a The shaded areas at the four corners are shown. Since one edge of two adjacent curved edges bends along the X direction and the other edge bends along the Y direction, the double-fold region 103 simultaneously has bending along both the X and Y directions. Dividing the first film layer 3 of the double-fold region 103 into n equal parts, n+1 equal division points are generated. For example, if the starting point of the bend is P1 and the ending point is Q, the intermediate equal division points along the direction away from the starting point P1 are P2 to Pn-1. The shortest distances between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 at the intermediate n-1 equal division points are respectively:

[0068]

[0069] The thickness of the first film layer 3 in the double-fold area 103 is set in such a way that the thickness of the first film layer 3 in the double-fold area 103 gradually decreases from the bending point P. The surface of the first film layer 3 in the double-fold area 103 that is bonded to the screen tends to be flat, which helps to reduce the redundancy of the screen in the double-fold area 103, alleviate or reduce the difficulty of bonding the screen in the double-fold area 103 to the cover plate, and reduce the risk of bonding bubbles, wrinkles, cracks, etc. in the double-fold area 103.

[0070] Optionally, D1 ranges from 20 to 50 μm, and Dn+1 ranges from 15 to 20 μm.

[0071] Optionally, such as Figure 3a and Figure 3b As shown, the first film layer 3 located in the double-fold region 103 passes through its bending point P near the middle region 101 and along any cross section away from the middle region 101. The first film layer 3 is divided into 10 equal parts through 9 equal division points from its bending point P to its cutoff point Q. At the bending point P, the shortest distance between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 is D1. At the cutoff point Q, the shortest distance between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 is D11. At any of the 9 equal division points, the shortest distance between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 is: Dn=D1-(n-1)*(D1-D11) / 10; where n represents the nth equal division point, n=2,3,4…9, and n is an integer; the 2nd to 9th equal division points are successively away from the bending point P.

[0072] Among them, such as Figure 3a As shown, the double-fold region 103 is divided into six equal parts at 15° intervals, resulting in seven dividing lines, L1 to L7. These seven dividing lines are all derived from the bending point P. A cross-section is made of the cover plate at each dividing line, and the thickness reduction of the first membrane layer 3 conforms to the following rules: [e.g., ...] Figure 3b As shown, the arc length of the cross-section of the substrate 1 near the first film layer 3 on the cover plate is divided into 10 equal parts, resulting in 11 equal division points. Among these 11 equal division points, if the starting point is P1 and the ending point is P11, the shortest distance D1 between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 at the starting point P1 is 20~50μm, and the shortest distance D11 between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 at the ending point P11 is... The shortest distances between the surface of the first film layer 3 away from the substrate 1 and the surface of the substrate 1 near the first film layer 3 at the nine equally spaced points (P2, P3, P4, P5, P6, P7, P8, P9, P10) are respectively: D2 = D1 - 10% * (D1 - D11); D3 = D1 - 20% * (D1 - D11); ...; D9 = D1 - 80% * (D1 - D11); D10 = D1 - 90% * (D1 - D11). This design causes the thickness of the first film layer 3 in the double-fold area 103 to gradually decrease from the bending point P. The surface of the first film layer 3 in the double-fold area 103 that is bonded to the screen tends to be flat, which helps to reduce the redundancy of the screen in the double-fold area 103, alleviate or reduce the difficulty of bonding the screen in the double-fold area 103 to the cover plate, and reduce the risk of bonding bubbles, wrinkles, cracks, etc. in the double-fold area 103.

[0073] Optionally, the thickness of the first film layer 3 located in the surrounding edge region 102 ranges from 1 to 50 μm.

[0074] Optionally, the thickness of the first film layer 3 located in the intermediate region 101 is uniform; the thickness of the first film layer 3 located in the intermediate region 101 ranges from 20 to 50 μm.

[0075] In some embodiments, the material of the first film layer 3 includes any one of polymethyl methacrylate (PMMA), polycarbonate (PC), polyimide (PI), polyethylene terephthalate (PET), and polystyrene (PS).

[0076] Optionally, the material of the first film layer 3 may also include an antistatic material. The first film layer 3 containing the antistatic material can carry or eliminate static charge, thereby preventing the static electricity accumulated on the cover side from being conducted to the circuit parts in the screen, and thus avoiding damage to the circuits in the screen caused by the static electricity accumulated on the cover side.

[0077] Based on the above structure of the cover plate, this embodiment also provides a method for preparing the cover plate, including: printing a light-shielding layer on one side of a substrate; and preparing a first film layer on the substrate after the above steps are completed by injection molding.

[0078] In this embodiment, the cover plate can be made by adding two processes to the existing cover plate manufacturing process. That is, after the light-shielding layer printing process is completed, the first film layer is first made by injection molding, and then the surface of the first film layer facing away from the substrate is clean and smooth by polishing.

[0079] The cover plate provided in this embodiment adapts the shape of the surface of the first film layer near the light-shielding layer to the surface of the light-shielding layer and the substrate near the first film layer. The first film layer can effectively fill the gap formed between the light-shielding layer and the substrate, thereby eliminating the gap in the light-shielding layer by covering the light-shielding layer with the first film layer. By making the surface of the first film layer away from the light-shielding layer flat, the bonding surface between the cover plate and the screen is flat, thereby solving the bonding bubbles caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer under the narrow bezel and the gap in the light-shielding layer when the cover plate is bonded to the screen, eliminating the risk of bonding bubbles around the edges of the screen using this cover plate.

[0080] This embodiment also provides a display module, including a display panel and a cover plate as described in the above embodiment, the cover plate covering the display side of the display panel.

[0081] Optionally, such as Figure 4a and Figure 4b As shown, the display panel includes a display screen 4, a polarizer 5 disposed on the display side of the display screen 4, and a heat dissipation film 6 disposed on the back side of the display screen 4. A transparent optical adhesive 7 is disposed on the side of the polarizer 5 facing away from the display screen 4. The first film layer 3 of the cover plate is bonded to the polarizer 5 of the display panel through the transparent optical adhesive 7.

[0082] The display screen 4 can be an OLED (Organic Light-Emitting Diode) display screen. The heat dissipation film 6 is used to dissipate heat from the display screen 4. The polarizer 5 can reduce the reflection of ambient light by the display screen 4.

[0083] By employing the cover plate described in the above embodiments, the bonding surface between the cover plate and the display panel is made flat, thereby solving the bonding bubble problem caused by insufficient overlap between the transparent optical adhesive and the light-shielding layer under the narrow bezel and the discontinuity of the light-shielding layer when the cover plate is bonded to the display panel. This eliminates the risk of bonding bubbles around the edges of the display module using this cover plate.

[0084] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A cover plate comprising a substrate having a central region and peripheral edge regions, the peripheral edge regions surrounding the periphery of the central region. The cover plate further includes a light-shielding layer located at the periphery of one side of the substrate. Its features are, The cover plate further includes a first film layer, which is located on the side of the light-shielding layer away from the substrate. The orthographic projection of the first film layer on the substrate covers the middle area and the orthographic projection of the light-shielding layer on the substrate. The surface of the first film layer near the light-shielding layer is adapted to the shape of the surface of the light-shielding layer and the substrate near the first film layer, and the surface of the first film layer away from the light-shielding layer is flat. The central area is a planar area, and the surrounding edge areas are arc-shaped areas, with the arc-shaped areas curving towards the side where the first film layer is located. The thickness of the first film layer located in the surrounding edge region gradually decreases in the direction away from the center region.

2. The cover plate according to claim 1, characterized in that, The surrounding edge area includes a double-fold region, which is the area connecting adjacent two side edge areas. The adjacent two side edge areas have different curvature directions. The first film layer located in the bifold region, along any cross-section near its starting point in the middle region and away from the middle region, is divided into n equal parts by n-1 equal division points from its starting point to its ending point. At the bending point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is D1. At the cutoff point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is Dn+1. At any one of the n-1 equally spaced points, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is: Dn-1=D1-( )*(D1-Dn+1); Wherein, n-1 represents the (n-1)th division point, n-1=2, 3, 4…(n-1), and n is an integer; the 2nd to (n-1)th division points are successively moved away from the starting point of the bend.

3. The cover plate according to claim 2, characterized in that, The first film layer located in the bifold region, along any cross-section near the bend point of the intermediate region and in the direction away from the intermediate region, is divided into 10 equal parts by 9 equal division points from its bend point to its end point. At the bending point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is D1. At the cutoff point, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is D11. At any one of the nine equally spaced points, the shortest distance between the surface of the first film layer facing away from the substrate and the surface of the substrate near the first film layer is: Dn = D1 - (n-1) * (D1 - D11) / 10; Where n represents the nth division point, n=2, 3, 4…9, and n is an integer; the 2nd to 9th division points are successively moved away from the starting point of the bend.

4. The cover plate according to claim 3, characterized in that, The range of D1 is 20–50 µm, and the range of Dn+1 is 15–20 µm.

5. The cover plate according to any one of claims 1-4, characterized in that, The thickness of the first film layer located in the surrounding edge region ranges from 1 to 50 µm.

6. The cover plate according to claim 1, characterized in that, The thickness of the first film layer located in the intermediate region is uniform; The thickness of the first film layer located in the intermediate region ranges from 20 to 50 µm.

7. The cover plate according to claim 1, characterized in that, The material of the first film layer includes any one of polymethyl methacrylate, polycarbonate, polyimide, polyethylene terephthalate, and polystyrene; Alternatively, the material of the first film layer may also include an antistatic material.

8. A method for preparing the cover plate according to any one of claims 1-7, comprising: A light-shielding layer is printed on one side of the substrate; characterized in that... The first film layer is prepared on the substrate after the above steps are completed using an injection molding process.

9. A display module, comprising a display panel, characterized in that, It also includes the cover plate as described in any one of claims 1-7, The cover plate is fitted onto the display side of the display panel.

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