Screens and electronic devices

Abstract

The embodiment of the application provides a screen and an electronic device, relates to the technical field of electronic devices, and the plane part comprises a first display screen, a first cover plate and a first coating layer which are stacked along a first direction, the first cover plate is arranged on the first display screen, the first coating layer is arranged on the surface of the first cover plate away from the first display screen, the bending part comprises a second display screen, a second cover plate and a second coating layer which are stacked along the first direction, the second cover plate is arranged on the second display screen, and the second coating layer is arranged on the surface of the second cover plate away from the second display screen, the hardness of the second coating layer is less than the hardness of the first coating layer, and the elongation at break of the second coating layer is greater than the elongation at break of the first coating layer. The screen provided by the application can improve the bending resistance of the second coating layer in the bending part.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and particularly to a screen and an electronic device. Background Technology

[0002] Mobile devices such as foldable phones have foldable screens. A foldable screen typically includes two flat sections and a folding section between them. The two flat sections can be folded or unfolded relative to the folding section. To improve the screen's scratch resistance, a high-hardness coating needs to be applied to it.

[0003] However, the coating on the screen in the aforementioned related technologies is prone to bending and cracking at the bending points, resulting in damage to the coating and the screen. Utility Model Content

[0004] This application provides a screen and electronic device that can improve the resistance to bending cracking of the coating at the bending portion while ensuring the scratch resistance of the coating.

[0005] This application provides a screen, which includes:

[0006] The planar portion includes a first display screen, a first cover plate, and a first coating layered along a first direction, wherein the first cover plate is disposed on the first display screen, and the first coating is disposed on the surface of the first cover plate facing away from the first display screen.

[0007] The bending portion includes a second display screen, a second cover plate, and a second coating layered along the first direction, wherein the second cover plate is disposed on the second display screen and the second coating is disposed on the surface of the second cover plate facing away from the second display screen;

[0008] The hardness of the second coating is less than that of the first coating, and the elongation at break of the second coating is greater than that of the first coating.

[0009] This application provides a screen that is divided into a flat section and a bending section. During the use of a foldable screen, the flat section mainly bears external scratches and friction, requiring high hardness to resist these external forces. The bending section, on the other hand, mainly bears bending stress, requiring lower hardness and higher elongation at break to adapt to the bending process. Therefore, the screen is divided into two areas and coated separately. The flat section uses a high-hardness first coating to improve wear resistance, and the high hardness of the first coating effectively prevents scratches on the flat section. The bending section uses a high-ductility second coating to enhance crack resistance. The low hardness and high elongation at break of the second coating ensure that the bending section is not easily broken during bending. Through differentiated coating design, high hardness protection and high deformation adaptability are achieved in the flat and bending sections of the screen, respectively. This approach improves surface wear resistance and crack resistance while ensuring the screen's bending performance, effectively balancing touch experience and durability. This solves the problem of balancing coating hardness and bending performance in existing technologies.

[0010] In one possible implementation, the hardness of the first coating is greater than or equal to 5H.

[0011] By optimizing the coating material composition and curing process, the hardness of the first coating on the planar portion is increased to above 5H, significantly reducing the risk of surface damage. Simultaneously, the low-modulus characteristics of the second coating on the bending portion are retained, avoiding bending cracking caused by the overall increase in hardness. This application achieves a significant enhancement in the scratch resistance of the planar portion while maintaining the flexibility of the bending portion. Through synergistic optimization of material composition and process, the first coating maintains surface integrity in high-frequency stylus contact scenarios, reducing visual imperfections and tactile interference, thereby improving the user experience of the foldable device in writing and touch scenarios.

[0012] In one possible implementation, the thickness of the first coating is greater than or equal to 10 μm along the first direction.

[0013] Through the above technical solution, this application effectively solves the problems of surface scratches and poor touch experience caused by insufficient coating thickness in the flat part while maintaining the overall thinness of the screen. At the same time, by optimizing the matching relationship between coating thickness and material hardness, it ensures that the flat part maintains stable scratch resistance in long-term use.

[0014] In one possible implementation, the elongation at break of the second coating is greater than or equal to 3.5%, and the hardness of the second coating is greater than or equal to 1H.

[0015] Compared with existing technologies, traditional bending zone coatings typically use high-hardness materials with an elongation at break of less than 3%, which are prone to brittle fracture when bent. This solution balances the threshold range of elongation at break and hardness, so that the second coating maintains structural integrity when subjected to repeated bending, while avoiding indentation caused by excessively low hardness when writing with a stylus.

[0016] Through the above technical solution, this application solves the problem of screen failure caused by brittle fracture of the coating at the bending point, significantly improves bending reliability while maintaining the basic surface protection performance, and ensures that the contact stress between the pen tip and the second coating is within a safe threshold during touch operation.

[0017] In one possible implementation, the thickness of the first coating is greater than the thickness of the second coating along the first direction.

[0018] Surface hardness and bending resistance can be balanced through thickness gradient design. For example, when the first and second coatings are prepared using the same material, the hardness of the second coating can be reduced and its elongation at break can be increased by adjusting the thickness of the second coating.

[0019] In one possible implementation, the first coating includes a transition coating segment and a main coating segment;

[0020] Along the second direction, the transition coating segment is located between the main coating segment and the second coating, and the transition coating segment is inclined relative to the main coating segment toward the second coating and connects to the second coating;

[0021] The second direction is perpendicular to the first direction.

[0022] At the junction of the planar section and the bent section, the transition coating section features a gradually changing thickness area created by an inclined angle, resulting in a smooth transition between the high-hardness main coating section and the low-hardness second coating. This structure disperses stress concentration during bending through the inclined surface, preventing interface cracking caused by hardness differences. The transition coating section and the main coating section use the same refractive index material to ensure optical consistency.

[0023] This solution introduces an inclined transition structure to create a region of gradual change in mechanical properties at the interface between coatings of different hardness. During bending, concentrated stress is transformed into distributed stress, effectively improving the reliability of the interface bonding.

[0024] In one possible implementation, the surface of the transition coating segment facing away from the first display screen is inclined relative to the surface of the main coating segment facing away from the first display screen and forms an included angle α, wherein the included angle α satisfies that α is less than or equal to 15°.

[0025] By controlling the included angle within 15°, the geometric deformation gradient of the transition region is reduced, and the tensile or compressive stress on the coating during bending is evenly distributed over a larger area. For example, in spraying or photolithography processes, the transition coating can form a continuous and smooth inclined surface by adjusting the nozzle movement path or mask pattern design, avoiding right-angle step structures.

[0026] In one possible implementation, the surface of the second coating facing away from the second display screen has multiple recesses.

[0027] By setting multiple recesses on the surface of the second coating, the deformation space of the second coating surface can be increased, the strain during the bending process can be absorbed, thereby reducing stress concentration, which can effectively improve the reliability of the bending part, reduce the damage to the second coating during the bending process, and improve the mechanical durability of the foldable screen while maintaining optical performance.

[0028] In one possible implementation, a third coating is also included, which is disposed on the side of the second coating opposite to the second cover plate and fills the plurality of said recesses.

[0029] Through the above technical solution, this application achieves the dual functions of stress buffering and structural reinforcement in the coating system at the bending section, significantly improving bending reliability while maintaining surface optical properties. The third coating's filling effect on the depression blocks the crack propagation path, and combined with the deformation capability of the elastic material, enables the composite coating system to maintain structural integrity during bending.

[0030] In one possible implementation, the surface of the third coating facing away from the second display screen is flush with the surface of the first coating facing away from the first display screen.

[0031] Through the above technical solution, this application achieves a seamless transition between touch operation in the bending area and the flat area, which can ensure the flatness of the screen surface, reduce the risk of stylus jumping or screen scratches caused by uneven surface, improve the structural stability of the coating in the bending area during dynamic folding, and also improve the appearance quality and user experience of the product.

[0032] A second aspect of this application provides an electronic device, which includes a body and a screen as described above.

[0033] The same electronic device in this application embodiment can improve the screen's resistance to bending cracks at the bending part while ensuring the scratch resistance of the flat part of the screen, thereby improving the screen's durability and service life. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0035] Figure 2 A schematic diagram of a screen structure provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a second type of screen provided in an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of a third type of screen provided in an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of the structure of the fourth type of screen provided in the embodiments of this application;

[0039] Figure 6 This is a schematic diagram of the structure of the fifth type of screen provided in the embodiments of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 10. Screen; 20. Main body;

[0042] 100. Planar part;

[0043] 110. First display screen; 120. First cover plate; 130. First coating;

[0044] 131. Transition coating section; 132. Main coating section;

[0045] 200. Bending section;

[0046] 210. Second display screen; 220. Second cover plate; 230. Second coating; 240. Third coating;

[0047] 231. Depression;

[0048] 300. Optical adhesive;

[0049] 400a, First protective layer; 400b, Second protective layer;

[0050] 500a, Anti-glare surface layer; 500b, Fourth coating layer; 500c, Fingerprint resistant layer;

[0051] 600a, First supporting film layer; 600b, Second supporting film layer;

[0052] 700a, First bamboo book layer; 700b, Second bamboo book layer;

[0053] 800a, first polarizer; 800b, second polarizer. Detailed Implementation

[0054] refer to Figure 1 This application provides an electronic device, which can be an electronic device with a foldable screen 10. The electronic device with a foldable screen 10 can include, but is not limited to, a foldable mobile phone, a foldable tablet computer, a foldable laptop computer, a foldable netbook, a foldable wearable device, and other mobile or fixed terminals.

[0055] In some embodiments, the electronic device may include a body 20 and a screen 10, wherein the screen 10 is a foldable screen 10. The screen 10 may include at least two planar portions 100 and at least one folding portion 200, wherein a folding portion 200 is provided between each pair of adjacent planar portions 100, and the two adjacent planar portions 100 can be folded or opened around the folding portion 200. When the two adjacent planar portions 100 are folded, the folding portion 200 is bent and deformed.

[0056] A coating can be provided on both the folded portion 200 and the flat portion 100 of the screen 10 to improve the scratch resistance of the folded screen 10. The coating is generally applied directly to the flat portion 100 and the folded portion of the folded screen 10 to improve the scratch resistance of the screen 10 at the corresponding locations of the flat portion 100 and the folded portion.

[0057] However, the coating on the screen at the bend is prone to bending and cracking, leading to damage to both the coating and the screen. This problem arises because the coating on the bend and flat surfaces of the screen is the same; for example, the coating is formed simultaneously on both the bend and flat surfaces. To ensure the scratch resistance of the flat screen, the overall hardness of the coating is relatively high, resulting in a relatively low elongation at break. This makes the coating more susceptible to bending and cracking, especially the coating at the bend. After repeated bending, the coating at the bend is more prone to cracking, further damaging both the coating and the screen.

[0058] To address the aforementioned technical problems, this application provides a screen and electronic device. By dividing the screen into a flat portion and a bending portion, the flat portion primarily bears external scratches and friction during the use of the folding screen, requiring high hardness to resist these external forces. The bending portion, on the other hand, primarily bears bending stress, requiring lower hardness and higher elongation at break to adapt to the bending process. Therefore, the screen is divided into two areas and coated separately. The flat portion uses a high-hardness first coating to improve wear resistance, and the high hardness of the first coating effectively prevents scratches on the flat portion. The bending portion uses a high-ductility second coating to enhance crack resistance. The low hardness and high elongation at break of the second coating ensure that the bending portion is not easily broken during bending. Through differentiated coating design, high hardness protection and high deformation adaptability are achieved in the flat and bending portions of the screen, respectively. This approach has the advantages of improving surface wear resistance and crack resistance while ensuring screen bending performance, effectively balancing touch experience and durability, thus solving the problem of difficulty in balancing coating hardness and bending performance in existing technologies.

[0059] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0060] refer to Figure 2 This application provides a screen 10, which may include a flat portion 100 and a bent portion 200.

[0061] The planar portion 100 may include a portion along a first direction (e.g. Figure 2 A first display screen 110, a first cover plate 120, and a first coating 130 are stacked in the Y direction. The first cover plate 120 is disposed on the first display screen 110, and the first coating 130 is disposed on the surface of the first cover plate 120 facing away from the first display screen 110.

[0062] The bending portion 200 may include a second display screen 210, a second cover plate 220, and a second coating 230 stacked along a first direction. The second cover plate 220 is disposed on the second display screen 210, and the second coating 230 is disposed on the surface of the second cover plate 220 facing away from the second display screen 210. The hardness of the second coating 230 is less than that of the first coating 130, and the elongation at break of the second coating 230 is greater than that of the first coating 130.

[0063] Hardness refers to a material's ability to resist surface plastic deformation. Elongation at break refers to the percentage of the original length of a material that it can withstand before fracture.

[0064] In some embodiments, the first coating 130 refers to the protective material covering the surface of the first cover plate 120 of the planar portion 100, which may be implemented using an organic-inorganic hybrid material and formed into a dense structure by ultraviolet light curing. The rigidity of the first coating 130 can effectively resist surface wear of the planar portion 100.

[0065] The second coating 230 refers to the flexible material covering the surface of the cover plate of the bent portion 200, which can be achieved using long-chain polyurethane composite materials, whose molecular structure allows for a greater degree of deformation recovery. The increased elongation at break enables the second coating 230 to withstand repeated folding stresses in the bending area without cracking.

[0066] Specifically, the first coating 130 of the planar portion 100 and the second coating 230 of the bent portion 200 are physically separated to form a functional partition. When the screen 10 is in the unfolded state, the hard coating of the planar portion 100 provides surface protection. When the screen 10 is folded, the second coating 230 of the bent portion 200 absorbs deformation energy through the extension of molecular chains.

[0067] In some embodiments, the refractive indices of the first coating 130 and the second coating 230 can be kept consistent, thereby ensuring the consistency of the visual effect.

[0068] In other embodiments, the stacked structure of the first coating 130 and the second coating 230 can maintain a uniform overall thickness, thereby avoiding step differences that could affect touch sensitivity.

[0069] This application provides a screen 10, which is divided into a flat part 100 and a bent part 200. During the use of the folded screen 10, the flat part 100 mainly bears external scratches and friction, and needs high hardness to resist these external forces, while the bent part 200 mainly bears bending stress, and needs lower hardness and higher elongation at break to adapt to the bending process. Therefore, the screen 10 is divided into two areas and coated separately. The flat part 100 uses a high-hardness first coating 130 to improve wear resistance. The high hardness of the first coating 130 can effectively prevent the flat part 100 from being scratched. The bending part 200 uses a high-ductility second coating 230 to enhance crack resistance. The low hardness and high elongation at break of the second coating 230 can ensure that the bending part 200 is not easy to break when bending. Through differentiated coating design, high hardness protection and high deformation adaptability are achieved in the flat part 100 and the bending part 200 of the screen 10, respectively. This has the advantages of improving surface wear resistance and crack resistance while ensuring the bending performance of the screen 10, effectively balancing the touch experience and durability, thus solving the problem of difficulty in balancing coating hardness and bending performance in the prior art.

[0070] Compared to existing technologies, traditional solutions employ a single-material coating structure, which cannot simultaneously address the performance requirements of different areas. This application achieves an optimized functional combination of the planar portion 100 and the bending portion 200 through a partitioned coating design. The brittleness problem of high-hardness coatings in existing technologies is resolved in the bending portion 200, while the wear resistance defects of low-hardness coatings are also improved in the planar portion 100.

[0071] Through the above technical solution, this application effectively balances the mechanical strength and deformation resistance of the foldable screen 10. The high-hardness coating in the planar area enhances the writing and touch experience and scratch resistance, while the high-ductility coating in the bending area ensures the reliability of the folding action. The synergistic effect of the two coatings extends the lifespan of the screen 10 while maintaining the slim and lightweight characteristics of the foldable device.

[0072] refer to Figure 2 In some embodiments, the hardness of the first coating 130 is greater than or equal to 5H. Correspondingly, the hardness of the second coating 230 can be at least less than 5H, so that the hardness of the second coating 230 is less than the hardness of the first coating 130, thereby enabling the elongation at break of the second coating 230 to be higher than that of the first coating 130.

[0073] The first coating 130 refers to a high-hardness protective layer applied to the surface of the first cover plate 120 of the planar portion 100. Specifically, it can be achieved using an organic-inorganic hybrid material formed by mixing and curing epoxy-siloxane molecules with epoxy-functionalized oligomeric siloxanes, or a high-modulus coating composed of polyurethane and inorganic silicon particles. The first coating 130 enhances the surface's scratch resistance by increasing the crosslinking density and the proportion of inorganic fillers.

[0074] In some embodiments, a high-hardness first coating 130 can be formed on the planar portion 100 by spraying or coating processes, forming a dense and wear-resistant surface structure after curing. Since the first coating 130 has a hardness of 5H or higher, it can effectively resist external friction and mechanical impact from the stylus. Simultaneously, through the optical consistency of the organic-inorganic hybrid material, it avoids the influence of interface refraction differences on the display effect. As the main touch area, the high-hardness first coating 130 on the planar portion 100 improves writing smoothness and tactile feedback by reducing the probability of surface plastic deformation.

[0075] Compared with existing technologies, this solution optimizes the coating material composition and curing process, thereby increasing the hardness of the first coating 130 of the planar portion 100 to above 5H, significantly reducing the risk of surface damage, while retaining the low modulus characteristics of the second coating 230 of the bent portion 200, avoiding bending cracking problems caused by the overall increase in hardness.

[0076] Through the above technical solution, this application achieves a significant enhancement in the scratch resistance of the flat portion 100 while maintaining the flexibility of the bending portion 200. The first coating 130, through synergistic optimization of material composition and process, maintains surface integrity in high-frequency contact scenarios with the stylus, reduces visual defects and tactile interference, thereby improving the user experience of the folding device in writing and touch scenarios.

[0077] refer to Figure 2 In some embodiments, along the first direction (e.g.) Figure 2 In the Y direction), the thickness of the first coating 130 is greater than or equal to 10 μm.

[0078] The first direction refers to the stacking direction, that is, the vertical direction in which the first display screen 110, the first cover plate 120 and the first coating 130 are stacked in sequence. Specifically, it can be achieved by a physical structure layout of vertical stacking. This direction determines the coverage area and mechanical transmission path of the first coating 130.

[0079] The thickness refers to the vertical dimension of the first coating 130 in the stacking direction. Specifically, it can be achieved by controlling the amount of coating deposition through inkjet printing or coating processes. This thickness directly affects the scratch resistance and structural stability of the coating.

[0080] In some embodiments, the first coating 130 of the planar portion 100 can be formed into a continuous cover layer through a coating process, with a thickness set to be not less than 10 μm to ensure sufficient mechanical strength to resist external friction and impact. This thickness range matches the characteristics of high-hardness materials, avoiding cracking due to localized stress concentration caused by excessive thinness. An ultraviolet curing process is used during coating to ensure a stable bond between the first coating 130 and the surface of the first cover plate 120, while maintaining optical transparency. Thickness control can be achieved by adjusting the coating speed and material viscosity to ensure uniform coverage of the first coating 130 without bubbles or cracks.

[0081] Through the above technical solution, this application effectively solves the problems of surface scratches and poor touch experience caused by insufficient coating thickness of the flat part 100 while maintaining the overall thinness of the screen 10. At the same time, by optimizing the matching relationship between coating thickness and material hardness, it ensures that the flat part 100 maintains stable scratch resistance in long-term use.

[0082] refer to Figure 2 In some embodiments, the elongation at break of the second coating 230 is greater than or equal to 3.5%, and the hardness of the second coating 230 is greater than or equal to 1H.

[0083] In some embodiments, the second coating 230 can be achieved using a composite material of polyurethane doped with silica particles with low crosslinking degree. Such materials absorb stress during bending through the slippage of molecular chains and the dispersion of inorganic particles. Alternatively, the second coating 230 can be specifically prepared by mixing a thermoplastic polyurethane matrix containing flexible segments with a low proportion of inorganic fillers. This combination maintains the basic scratch resistance while avoiding brittle fracture caused by excessive modulus.

[0084] In some embodiments, the bending portion 200 employs a second coating 230 with an elongation at break greater than or equal to 3.5%. This allows the second coating 230 to disperse localized stress concentration through reversible deformation of its molecular chains under bending stress, preventing crack propagation. Simultaneously, the hardness of the second coating 230 is controlled within a range greater than or equal to 1H, avoiding both excessively low hardness leading to easy surface wear and excessively high hardness causing a large modulus difference between the second coating 230 and the second cover plate 220 of the bending portion 200. The second coating 230 is formed using a UV curing process, covering the bending portion 200 with a low-crosslinking polyurethane backbone structure, wherein silica particles are uniformly dispersed at a mass fraction of 10-30%, forming a composite system that combines flexibility and basic rigidity.

[0085] Compared with existing technologies, traditional bending zone coatings typically use high-hardness materials with an elongation at break of less than 3%, which are prone to brittle fracture when bent. This solution balances the threshold range of elongation at break and hardness, so that the second coating 230 maintains structural integrity when subjected to repeated bending, while avoiding indentation 231 caused by excessively low hardness when writing with a stylus.

[0086] Through the above technical solution, this application solves the problem of screen 10 failure caused by brittle fracture of the coating of the bending part 200. It significantly improves bending reliability while maintaining the basic surface protection performance, and ensures that the contact stress between the pen tip and the second coating 230 is within the safe threshold during touch operation.

[0087] refer to Figure 3 In some embodiments, along the first direction, the thickness of the first coating 130 (e.g.) Figure 3 The thickness of the middle layer (h1) is greater than that of the second coating layer (230). Figure 3 (h2).

[0088] The thickness difference along the first direction refers to the thinness of the first coating 130 on the planar portion 100 and the thickness of the second coating 230 on the bent portion 200. This can be achieved through regional spraying or photolithography, balancing surface hardness and bending resistance through thickness gradient design. For example, when the first coating 130 and the second coating 230 are prepared using the same material, the hardness of the second coating 230 can be reduced and the elongation at break can be increased by adjusting the thickness of the second coating 230.

[0089] refer to Figure 3 In some embodiments, the first coating 130 may include a transition coating segment 131 and a main coating segment 132. Along a second direction, the transition coating segment 131 is located between the main coating segment 132 and the second coating 230, the transition coating segment 131 is inclined relative to the main coating segment 132 toward the second coating 230 and connects to the second coating 230, and the second direction is perpendicular to the first direction.

[0090] The transition coating segment 131 refers to the inclined connection structure located between the main coating segment 132 and the second coating 230. Specifically, it can be formed with a gradient thickness using inkjet printing or optical etching processes to alleviate stress abrupt changes between coating areas. The main coating segment 132 refers to the main part of the high-hardness coating in the planar portion 100. Specifically, it can be implemented using an organic-inorganic hybrid material to provide surface scratch resistance.

[0091] The second direction refers to the horizontal extension direction perpendicular to the stacking direction, specifically the horizontal or vertical direction when the screen 10 surface is unfolded, used to define the inclined extension path of the transition section. The inclined connection means that the transition coating section 131 extends from the main coating section 132 to the second coating 230 in a continuously gradient form, which can be achieved by adjusting the spraying angle or etching parameters, used to disperse the mechanical stress in the bending area.

[0092] Specifically, at the junction of the planar portion 100 and the bent portion 200, the transition coating section 131 forms a gradually changing thickness region through an inclined angle design, resulting in a smooth transition between the high-hardness main coating section 132 and the low-hardness second coating 230. This structure disperses stress concentration during bending through the inclined surface, avoiding interface cracking caused by hardness differences. The transition coating section 131 and the main coating section 132 use materials with the same refractive index to ensure optical consistency.

[0093] This solution introduces an inclined transition structure to create a region of gradual change in mechanical properties at the interface between coatings of different hardness. During bending, concentrated stress is transformed into distributed stress, effectively improving the reliability of the interface bonding.

[0094] refer to Figure 3 In some embodiments, the surface of the transition coating segment 131 facing away from the first display screen 110 is inclined relative to the surface of the main coating segment 132 facing away from the first display screen 110 and forms an included angle α (e.g., Figure 3 Angle a in the triangle, where the included angle a satisfies that a is less than or equal to 15°. For example, the included angle a can be one of 5°, 6°, 8°, 10°, 12°, 13°, and 15°.

[0095] Here, the included angle α refers to the tilt angle between the transition coating segment 131 and the main coating segment 132, which can be achieved by controlling the coating process parameters or the mold shape. This angle constraint provides geometric optimization for strain dispersion in the bending area, avoiding excessive stress concentration in a specific region.

[0096] Specifically, the transition coating segment 131 extends from the main coating segment 132 toward the second coating segment 230, forming a gently sloping connection between the two. By controlling the included angle within 15°, the geometric deformation gradient of the transition region is reduced, and the tensile or compressive stress on the coating during bending is evenly distributed over a larger area. For example, in spraying or photolithography processes, the transition coating segment can form a continuous and smooth sloping surface by adjusting the nozzle movement path or mask pattern design, avoiding right-angle step structures.

[0097] This solution limits the tilt angle of the transition coating segment 131, making the coating thickness variation area form a slope-like structure, which significantly reduces the peak mechanical stress at the interface.

[0098] The tilt angle limitation of the transition coating section 131 optimizes the stress distribution at the coating interface, making the mechanical transition between the first coating 130 and the second coating 230 smoother and preventing local stress from exceeding the load-bearing limit of the coating material.

[0099] refer to Figure 4 In some embodiments, the surface of the second coating 230 facing away from the second display screen 210 has a plurality of recesses 231.

[0100] Among them, multiple depressions 231 refer to regular or irregular shaped pits or grooves formed on the surface of the second coating 230. Specifically, they can be achieved by laser etching, chemical etching or mechanical imprinting processes, thereby improving stress dispersion ability by changing the surface morphology.

[0101] Specifically, when the bending portion 200 is implemented, the surface of the second coating 230 is etched to form densely distributed recesses 231. When the screen 10 is folded, the compressive stress in the bending area is effectively absorbed by the deformation of the recesses 231, preventing stress concentration from causing the second coating 230 to crack.

[0102] By providing multiple recesses 231 on the surface of the second coating 230, the deformation space of the surface of the second coating 230 can be increased, the strain during the bending process can be absorbed, thereby reducing stress concentration, which can effectively improve the reliability of the bending part 200, reduce the damage to the second coating 230 during the bending process, and improve the mechanical durability of the foldable screen while maintaining optical performance.

[0103] refer to Figure 4 In some embodiments, the screen 10 may further include a third coating 240, which is disposed on the side of the second coating 230 facing away from the second cover plate 220 and fills a plurality of recesses 231.

[0104] The third coating 240 refers to the material layer applied to the surface of the second coating 230 in the bent portion 200. Specifically, it can be made of a material with a refractive index similar to the second coating 230 and a lower elongation at break compared to the first coating 130, such as polyurethane or silicone composite materials, to ensure consistent optical performance and enhance the structural buffering capacity of the bent area. The recess 231 refers to the micro-pit structure formed on the surface of the second coating 230 through etching or imprinting processes. Specifically, it can be prepared using photolithography or laser engraving techniques. Its function is to disperse bending stress and reduce the risk of crack propagation within the coating.

[0105] Specifically, after the depression 231 structure is formed on the surface of the second coating 230, the third coating 240 is filled into the depression 231 by dip coating or spray coating. The material of the third coating 240 and the second coating 230 are bonded to each other through intermolecular forces or chemical bonds to form an interface bond, and a continuous and smooth surface transition is formed after filling the depression 231.

[0106] Through the above technical solution, this application achieves the dual functions of stress buffering and structural reinforcement in the coating system of the bent portion 200, significantly improving bending reliability while maintaining surface optical properties. The filling effect of the third coating 240 on the depression 231 blocks the crack propagation path, and combined with the deformation capability of the elastic material, enables the composite coating system to maintain structural integrity during bending.

[0107] refer to Figure 4 In some embodiments, the surface of the third coating 240 facing away from the second display screen 210 is flush with the surface of the first coating 130 facing away from the first display screen 110.

[0108] Surface flatness means that the outer surface of the third coating 240 facing away from the second cover plate 220 is on the same plane as the outer surface of the first coating 130 facing away from the first cover plate 120. This can be achieved by adjusting the coating thickness or by using a grinding process, thereby eliminating touch interference caused by uneven structure.

[0109] Specifically, after the second coating 230 is applied to the bent portion 200, the depression 231 formed on its surface is completely filled by the third coating 240. Subsequently, the third coating 240 is cured and its thickness is controlled so that its final outer surface remains flush with the outer surface of the first coating 130 of the flat portion 100. Since the optical parameters of the third coating 240 material match those of the second coating 230, no refractive difference will occur after filling, and the surface flatness ensures that there is no local friction or visual difference during touch operation.

[0110] Through the above technical solution, this application achieves a seamless transition between touch operation in the bending area and the flat area, which can ensure the flatness of the screen 10 surface, reduce the risk of stylus jumping or screen 10 scratches caused by uneven surface, improve the structural stability of the coating in the bending area during dynamic folding, and also improve the appearance quality and user experience of the product.

[0111] refer to Figure 4 In some embodiments, the first display screen 110 of the planar portion 100 and the second display screen 210 of the bent portion 200 can be an integral structure, and the first cover plate 120 of the planar portion 100 and the second cover plate 220 of the bent portion 200 can also be an integral structure.

[0112] refer to Figure 4 In some embodiments, the first display screen 110 and the first cover plate 120 can be bonded together with optical adhesive 300, and the second display screen 210 and the second cover plate 220 can also be bonded together with optical adhesive 300.

[0113] refer to Figure 5 In some embodiments, a first protective layer 400a may be provided between the first cover plate 120 and the first coating 130 of the planar portion 100, and the first protective layer 400a may be used to protect the first cover plate 120. A second protective layer 400b may be provided between the second cover plate 220 and the second coating 230 of the bent portion 200, and the second protective layer 400b may be used to protect the second cover plate 220.

[0114] In some embodiments, the first protective layer 400a and the second protective layer 400b can be an integral structural layer.

[0115] refer to Figure 3 , Figure 5 and Figure 6 In some embodiments, the side of the first coating 130 and the second coating 230 facing away from the first cover plate 120 is also covered with at least one of a surface anti-glare layer 500a, a fourth coating 500b for reducing reflectivity, and a fingerprint-resistant layer 500c. The surface anti-glare layer 500a, the fourth coating 500b, and the fingerprint-resistant layer 500c can completely cover the first coating 130 and the second coating 230.

[0116] refer to Figure 6In some embodiments, the screen 10 may further include a first support film layer 600a and a second support film layer 600b, and the screen 10 may also include a first book layer 700a and a second book layer 700b. The first support film layer 600a is disposed between the first display screen 110 and the first book layer 700a, and the first support film layer 600a is used to support the first display screen 110. The second support film layer 600b is disposed between the second display screen 210 and the second book layer 700b, and the second support film layer 600b is used to support the second display screen 210.

[0117] refer to Figure 6 In some embodiments, the first support film layer 600a and the second support film layer 600b can be an integral structure, and the first bamboo book layer 700a and the second bamboo book layer 700b can also be an integral structure.

[0118] refer to Figure 6 In some embodiments, the screen 10 may further include a first polarizer 800a and a second polarizer 800b, with the first polarizer 800a disposed on the side of the first display screen 110 facing the first coating 130, and the second polarizer 800b disposed on the side of the second display screen 210 facing the second coating 230. In some embodiments, the first polarizer 800a and the second polarizer 800b may be an integral structure.

[0119] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0120] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0121] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0122] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A screen (10), characterized in that, include: The planar portion (100) includes a first display screen (110), a first cover plate (120), and a first coating (130) stacked along a first direction. The first cover plate (120) is disposed on the first display screen (110), and the first coating (130) is disposed on the surface of the first cover plate (120) facing away from the first display screen (110). The bending portion (200) includes a second display screen (210), a second cover plate (220), and a second coating (230) stacked along the first direction. The second cover plate (220) is disposed on the second display screen (210), and the second coating (230) is disposed on the surface of the second cover plate (220) facing away from the second display screen (210). The hardness of the second coating (230) is less than that of the first coating (130), and the elongation at break of the second coating (230) is greater than that of the first coating (130).

2. The screen (10) according to claim 1, characterized in that, The hardness of the first coating (130) is greater than or equal to 5H.

3. The screen (10) according to claim 2, characterized in that, Along the first direction, the thickness of the first coating (130) is greater than or equal to 10 μm.

4. The screen (10) according to claim 1, characterized in that, The elongation at break of the second coating (230) is greater than or equal to 3.5%, and the hardness of the second coating (230) is greater than or equal to 1H.

5. The screen (10) according to claim 1, characterized in that, Along the first direction, the thickness of the first coating (130) is greater than the thickness of the second coating (230).

6. The screen (10) according to claim 5, characterized in that, The first coating (130) includes a transition coating segment (131) and a main body (20) coating segment; Along the second direction, the transition coating segment (131) is located between the body (20) coating segment and the second coating (230), and the transition coating segment (131) is inclined relative to the body (20) coating segment toward the second coating (230) and connects to the second coating (230); The second direction is perpendicular to the first direction.

7. The screen (10) according to claim 6, characterized in that, The surface of the transition coating segment (131) facing away from the first display screen (110) is inclined relative to the surface of the coating segment of the main body (20) facing away from the first display screen (110) and forms an included angle α, wherein the included angle α satisfies that α is less than or equal to 15°.

8. The screen (10) according to claim 1, characterized in that, The second coating (230) has a plurality of recesses (231) on the surface facing away from the second display screen (210).

9. The screen (10) according to claim 8, characterized in that, It also includes a third coating (240) disposed on the side of the second coating (230) facing away from the second cover plate (220) and filling the plurality of said recesses (231).

10. The screen (10) according to claim 9, characterized in that, The surface of the third coating (240) facing away from the second display screen (210) is flush with the surface of the first coating (130) facing away from the first display screen (110).

11. An electronic device, characterized in that, It includes a main body (20) and a screen (10) as claimed in any one of claims 1 to 10.

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