Cover plate, flexible display screen assembly and foldable electronic equipment

Abstract

The invention provides a cover plate, a flexible display screen assembly and foldable electronic equipment. The cover plate comprises a wear-resistant layer; the flexible resin layer is arranged on one side of the wear-resistant layer in a laminated manner; the buffer layer is arranged on the side, away from the wear-resistant layer, of the flexible resin layer in a stacked mode, and the water contact angle theta of the surface, away from the flexible resin layer, of the buffer layer is smaller than or equal to 30 degrees. The cover plate provided by the embodiment of the invention has relatively good impact resistance.

Description

Technical Field

[0001] The present application relates to the field of electronics, and in particular to a cover plate, a flexible display screen assembly and a foldable electronic device. Background Art

[0002] With the development of technology and the improvement of living standards, people have put forward higher requirements for portable electronic devices. Therefore, foldable electronic devices such as foldable mobile phones have emerged. In order to better protect the foldable electronic devices, a cover plate is set on the flexible display screen of the foldable electronic device. Using a flexible resin layer such as polyimide (PI for short) as the cover plate of the flexible display screen can make the flexible display screen have better bending performance, but its impact resistance is poor. Summary of the invention

[0003] The embodiment of the present application provides a cover plate, which has good impact resistance.

[0004] A first aspect of the present application provides a cover plate, comprising:

[0005] Wear-resistant layer;

[0006] a flexible resin layer, the flexible resin layer being stacked on one side of the wear-resistant layer; and

[0007] A buffer layer is stacked on a side of the flexible resin layer away from the wear-resistant layer, and a water contact angle θ of a surface of the buffer layer away from the flexible resin layer is: θ≤30°.

[0008] A second aspect of the present application provides a cover plate, comprising:

[0009] A wear-resistant layer, the wear-resistant layer comprising acrylic resin, metal oxide and anti-fingerprint additive;

[0010] a flexible resin layer, the flexible resin layer being stacked on one side of the wear-resistant layer; and

[0011] The buffer layer is stacked on a side of the flexible resin layer away from the wear-resistant layer.

[0012] A third aspect of the present application provides a flexible display screen assembly, comprising:

[0013] A flexible display screen having a display surface; and

[0014] The cover plate described in any one of the first aspect or the second aspect of the present application is stacked on the display surface of the flexible display screen to protect the flexible display screen, and the buffer layer of the cover plate is closer to the flexible display screen than the wear-resistant layer of the cover plate.

[0015] A fourth aspect of the present application provides a foldable electronic device, comprising:

[0016] The flexible display screen assembly according to the third aspect of the present application;

[0017] a foldable mechanism, the foldable mechanism being used to carry the flexible display screen assembly and to drive the flexible display screen assembly to be folded or flattened, wherein the cover plate of the flexible display screen assembly is further away from the foldable mechanism than the flexible display screen of the flexible display screen assembly; and

[0018] A processor is electrically connected to the flexible display screen assembly and is used to control the flexible display screen assembly to display.

[0019] The cover plate of the embodiment of the present application includes a buffer layer, a flexible resin layer and a wear-resistant layer which are stacked in sequence. The buffer layer has a buffering effect. When the cover plate is impacted by an external force, the buffer layer deforms to absorb the external impact force, thereby improving the impact resistance of the cover plate, so that the cover plate has good impact resistance; the flexible resin layer makes the cover plate have good bending performance, so that it has a small bending radius; the wear-resistant layer makes the cover plate have good wear resistance, and is not easy to be scratched or worn, so that the cover plate has a longer service life. In addition, the water contact angle θ of the surface of the buffer layer of the embodiment of the present application away from the flexible resin layer is less than or equal to 30°, so that when the cover plate is bonded to the flexible display screen with an adhesive layer, the buffer layer and the adhesive layer have better bonding force, so that the cover plate and the flexible display screen have better bonding force. When the cover plate is applied to a foldable electronic device, it is not easy to fall off or delaminate during the folding and flattening of the foldable electronic device, and can withstand more bending times. Furthermore, the cover plate of the embodiment of the present application has a lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the planar structure of a cover plate according to an embodiment of the present application.

[0022] Figure 2 The cover edge of an embodiment of the present application Figure 1 Schematic diagram of the cross-sectional structure in the AA direction.

[0023] Figure 3 It is a schematic diagram of the planar structure of a flexible display screen assembly according to an embodiment of the present application.

[0024] Figure 4 The flexible display screen component of one embodiment of the present application is Figure 3 Schematic diagram of the cross-sectional structure in the BB direction.

[0025] Figure 5 The flexible display screen assembly of another embodiment of the present application is Figure 3 Schematic diagram of the cross-sectional structure in the BB direction.

[0026] Figure 6 It is a schematic structural diagram of a foldable electronic device in a flattened state according to an embodiment of the present application.

[0027] Figure 7 It is a schematic structural diagram of a foldable electronic device in a folded state according to an embodiment of the present application.

[0028] Figure 8 It is a circuit block diagram of an electronic device according to an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100-cover plate, 10-wear-resistant layer, 30-flexible resin layer, 50-buffer layer, 200-flexible display assembly, 210-flexible display, 211-display surface, 230-adhesive layer,

[0031] 300 - foldable electronic device, 310 - foldable mechanism, 311 - first carrier, 313 - connecting shaft, 315 - second carrier, 330 - processor, 350 - memory, 370 - camera module. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0035] It should be noted that, for the convenience of explanation, in the embodiments of the present application, the same figure marks represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0036] Flexible display screens can be protected by ultra-thin glass (UTG) to improve the impact resistance of flexible display screens, thereby increasing the service life of flexible display screens. However, ultra-thin glass is expensive and has poor bending performance. Under the same thickness, it has a larger bending radius. After being applied to foldable electronic devices, when the foldable electronic devices are in a folded state, they have a larger thickness, which is not conducive to the carrying of foldable electronic devices. In addition, ultra-thin glass is brittle and easy to break. When used to protect flexible display screens, it is also necessary to use optical glue (OCA glue) to bond a screen protection layer (such as transparent polyimide) on the surface of the ultra-thin glass, and the costs of UTG, OCA and UTG are all high.

[0037] In addition, flexible displays can also be protected by polyimide to improve the impact resistance of flexible displays, thereby increasing the service life of flexible displays. However, the impact resistance of polyimide is much lower than that of ultra-thin glass, and its reliability is poor. In addition, polyimide has poor wear resistance and scratch resistance, and it is also necessary to set up a replaceable protective layer to facilitate replacement after scratching.

[0038] See also Figure 1 and Figure 2 The embodiment of the present application provides a cover plate 100, which includes: a wear-resistant layer 10, a flexible resin layer 30 and a buffer layer 50. The flexible resin layer 30 is stacked on one side of the wear-resistant layer 10; the buffer layer 50 is stacked on the side of the flexible resin layer 30 away from the wear-resistant layer 10, and the water contact angle (also known as the water drop angle) θ of the surface of the buffer layer 50 away from the flexible resin layer 30 is: θ≤30°.

[0039] The cover plate 100 of the embodiment of the present application can be applied to a foldable electronic device and used as the cover plate 100 of a flexible display screen of the foldable electronic device to protect the flexible display screen.

[0040] It can be understood that the buffer layer 50 , the wear-resistant layer 10 and the flexible resin layer 30 are stacked in sequence.

[0041] It should be noted that when the cover plate 100 is applied to a foldable electronic device, the buffer layer 50 is closer to the flexible display screen than the wear-resistant layer 10. In other words, the wear resistance is closer to the outer surface of the foldable electronic device than the buffer layer 50. In a specific embodiment, the wear-resistant layer 10 serves as the outermost layer of the foldable electronic device so that the cover plate 100 has good wear resistance and prevents the cover plate 100 from being scratched, so as to increase the service life of the cover plate 100. When the cover plate 100 is arranged on a flexible display screen, the cover plate 100 is bonded to the flexible display screen with an adhesive layer such as optical glue (OCA glue for short). Specifically, OCA glue is arranged on the surface of the buffer layer 50 away from the wear-resistant layer 10, and the surface of the cover plate 100 with OCA glue is adhered to the display surface of the flexible display screen.

[0042] Further, the water contact angle θ of the surface of the buffer layer 50 away from the flexible resin layer 30 may be, but not limited to, θ≤25°; or θ≤20°; or θ≤18°; or θ≤15°; or θ≤13°; or θ≤10°; or θ≤5°, etc. Specifically, the water contact angle θ of the surface of the buffer layer 50 away from the flexible resin layer 30 may be, but not limited to, 30°, 28°, 25°, 23°, 20°, 18°, 15°, 13°, 10°, 8°, 5°, 3°, 1°, etc. The water contact angle θ of the surface of the buffer layer 50 away from the flexible resin layer 30 in the embodiment of the present application is less than or equal to 30°, so that when the cover plate 100 is bonded to the flexible display screen by the adhesive layer, the buffer layer 50 has better adhesion with the adhesive layer. When applied to a foldable electronic device, it is not easy to fall off or delaminate during the folding and flattening of the foldable electronic device, and can withstand more bending times.

[0043] It can be understood that the buffer layer 50 of the present application has relatively good impact absorption performance, and can improve the ball drop impact, pen drop impact and other properties of the flexible resin layer 30 through its own deformation and thixotropic properties.

[0044] The cover plate 100 of the embodiment of the present application includes a buffer layer 50, a flexible resin layer 30 and a wear-resistant layer 10 which are stacked in sequence. The buffer layer 50 has a buffering effect. When the cover plate 100 is impacted by an external force, the buffer layer 50 deforms to absorb the external impact force, thereby improving the impact resistance of the cover plate 100, so that the cover plate 100 has better impact resistance; the flexible resin layer 30 enables the cover plate 100 to have better bending performance, thereby having a smaller bending radius; the wear-resistant layer 10 enables the cover plate 100 to have better wear resistance and is not easy to be scratched or worn, thereby enabling the cover plate 100 to have a longer service life. In addition, the water contact angle θ of the surface of the buffer layer 50 facing away from the flexible resin layer 30 in the embodiment of the present application is less than or equal to 30°, so that when the cover plate 100 is bonded to the flexible display screen using an adhesive layer, the buffer layer 50 and the adhesive layer have better adhesion, so that the cover plate 100 and the flexible display screen have better bonding force. When the cover plate 100 is applied to a foldable electronic device, it is not easy to fall off or delaminate during the folding and flattening of the foldable electronic device, and can withstand more bending. Furthermore, the cover plate 100 of the embodiment of the present application has a lower cost.

[0045] In some embodiments of the present application, the wear-resistant layer 10 includes acrylic resin, metal oxide and anti-fingerprint additive. Acrylic resin is used as the matrix of the wear-resistant layer 10, the metal oxide can improve the wear resistance and hardness of the wear-resistant layer 10, and the anti-fingerprint additive can improve the water contact angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30, so that the wear-resistant layer 10 also has a good anti-fingerprint effect.

[0046] In some embodiments of the present application, in the wear-resistant layer 10, the mass ratio M of the acrylic resin to the metal oxide is in the range of 1≤M≤5. Specifically, the mass ratio M of the acrylic resin to the metal oxide can be, but is not limited to, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc. If the mass ratio M of the acrylic resin to the metal oxide is too small, it means that the content of the acrylic resin is reduced and the content of the metal oxide is increased, which will reduce the flexibility of the wear-resistant layer 10, improve the brittleness of the wear-resistant layer 10, and reduce the bending performance of the wear-resistant layer 10; if the mass ratio M of the acrylic resin to the metal oxide is too large, it means that the content of the acrylic resin is increased and the content of the metal oxide is reduced. Although the wear-resistant layer 10 has good toughness and bending performance, it will reduce the hardness and wear resistance of the wear-resistant layer 10. When the mass ratio M of the acrylic resin to the metal oxide is in the range of 1≤M≤5, the wear-resistant layer 10 has high hardness and wear resistance while ensuring good toughness and bending performance.

[0047] Furthermore, the mass ratio M of the acrylic resin to the metal oxide is in the range of 2≤M≤5. In this way, the wear-resistant layer 10 can have good toughness and bending performance, as well as high hardness and wear resistance.

[0048] Furthermore, the mass ratio M of the acrylic resin to the metal oxide is in the range of 3≤M≤5. In this way, the wear-resistant layer 10 can have good toughness and bending performance, as well as high hardness and wear resistance.

[0049] Furthermore, the mass ratio M of the acrylic resin to the metal oxide is in the range of 3≤M≤4.5. In this way, the wear-resistant layer 10 can have good toughness and bending performance, as well as high hardness and wear resistance.

[0050] In some embodiments, the mass fraction of the acrylic resin in the wear-resistant layer 10 ranges from 49.5% to 83.1%. Further, the mass fraction of the acrylic resin in the wear-resistant layer 10 ranges from 60% to 80%. Further, the mass fraction of the acrylic resin in the wear-resistant layer 10 ranges from 70% to 83.1%. Specifically, the mass fraction of the acrylic resin in the wear-resistant layer 10 can be, but is not limited to, 49.5%, 53%, 55%, 60%, 65%, 70%, 75%, 80%, 83.1%, etc.

[0051] In the embodiments of the present application, when a numerical value ranges from a to b is involved, unless otherwise specified, it means that the numerical value can be any numerical value between a and b, including the endpoint numerical value a and the endpoint numerical value b.

[0052] In some embodiments, the mass fraction of the metal oxide in the wear-resistant layer 10 ranges from 16.7% to 49.5%. Further, the mass fraction of the metal oxide in the wear-resistant layer 10 ranges from 16.7% to 40%. Further, the mass fraction of the metal oxide in the wear-resistant layer 10 ranges from 18% to 25%. Specifically, the mass fraction of the metal oxide in the wear-resistant layer 10 may be, but is not limited to, 16.7%, 20%, 25%, 30%, 35%, 40%, 45%, 49.5%, etc.

[0053] Optionally, the acrylic resin may be, but is not limited to, at least one of a light-curing (such as ultraviolet light-curing, UV-curing for short) acrylic resin and a heat-curing acrylic resin.

[0054] In some embodiments, the acrylic resin is a photocurable resin, and the raw material components of the wear-resistant layer 10 include acrylic resin monomers, metal oxides, anti-fingerprint additives and photoinitiators. Optionally, the wear-resistant layer 10 is formed by the following steps: 1) mixing acrylic resin monomers, metal oxides, anti-fingerprint additives and photoinitiators according to a preset ratio to form a slurry; 2) applying the slurry to the surface of the flexible resin layer 30 to form a glue layer; 3) irradiating with a mercury lamp or an LED lamp to cure the glue layer to form the wear-resistant layer 10. Optionally, the photoinitiator can be, but is not limited to, at least one of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide (TPO for short), propylthioxanthone (ITX for short), benzophenone (BP for short), etc.

[0055] Optionally, the metal oxide includes at least one of aluminum oxide, silicon oxide, zirconium oxide, boehmite, magnesium oxide, cerium oxide, and barium oxide.

[0056] In some embodiments of the present application, the average particle size D of the metal oxide is in the range of 50 nm ≤ D ≤ 1 μm. Specifically, the average particle size D of the metal oxide may be, but is not limited to, 50 nm, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, or 1 μm. If the average particle size D of the metal oxide is too large, the metal oxide is easy to settle in the acrylic resin system, so that the metal oxide in the wear-resistant layer 10 runs more toward the side close to the flexible resin layer 30, and the content of the metal oxide on the side of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, so that the distribution of the metal oxide in the wear-resistant layer 10 is uneven, and the content of the metal oxide in the part of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, thereby reducing the hardness and wear resistance of the wear-resistant layer 10; if the average particle size D of the metal oxide is too small, the metal oxide is easy to agglomerate, making the acrylic resin phase discontinuous, and the wear-resistant layer 10 is prone to defects, holes, etc., which affects the appearance of the wear-resistant layer 10, and reduces the mechanical strength and elongation at break of the wear-resistant layer 10, and reduces the bending performance of the wear-resistant layer 10. When the average particle size D of the metal oxide is in the range of 50nm≤D≤1μm, the metal oxide is not easy to agglomerate and settle in the acrylic resin, has good dispersibility, can better improve the wear resistance and hardness of the wear-resistant layer 10, and make the wear-resistant layer 10 have better impact strength and bending performance.

[0057] Furthermore, the range of the average particle size D of the metal oxide is: 50nm≤D≤200nm. When the average particle size D of the metal oxide is between 50nm and 200nm, the metal oxide is less likely to agglomerate and settle in the acrylic resin, has better dispersibility, can better improve the wear resistance and hardness of the wear-resistant layer 10, and make the wear-resistant layer 10 have better impact strength and bending performance.

[0058] In some embodiments of the present application, the Vickers hardness of the metal oxide is greater than or equal to 800 HV. Further, the Vickers hardness of the metal oxide may be, but is not limited to, greater than or equal to 1000 HV, greater than or equal to 1200 HV, greater than or equal to 1500 HV, or greater than or equal to 2000 HV.

[0059] In some embodiments, the Vickers hardness of the metal oxide ranges from 800HV to 5000HV. Further, the Vickers hardness of the metal oxide ranges from 800HV to 4000HV. Further, the Vickers hardness of the metal oxide ranges from 1200HV to 4000HV. Further, the Vickers hardness of the metal oxide ranges from 1500HV to 3000HV. Further, the Vickers hardness of the metal oxide ranges from 1800HV to 2500HV. Specifically, the Vickers hardness of the metal oxide may be, but is not limited to, 800HV, 900HV, 1000HV, 1300HV, 1500HV, 1800HV, 2000HV, 2500HV, 3000HV, 3500HV, 4000HV, 4500HV, 5000HV, etc. If the Vickers hardness of the metal oxide is too low, the improvement of the hardness and wear resistance of the wear-resistant layer 10 is limited. If the Vickers hardness of the metal oxide is too high, although the hardness and wear resistance of the wear-resistant layer 10 can be better improved, the cost of the material is increased and may even be unattainable.

[0060] In this embodiment, the Vickers hardness of the metal oxide is greater than or equal to 800 HV, and has a relatively high Vickers hardness, so that only a relatively small amount of metal oxide is required to be added to improve the hardness and wear resistance of the wear-resistant layer 10. At the same time, due to the relatively small amount of metal oxide added and the relatively large content of acrylic resin, the wear-resistant layer 10 has better toughness and bending properties, and the cover plate 100 has a smaller bending radius.

[0061] In some embodiments, the density of the metal oxide is ρ≤4.0 g / cm 3 Furthermore, the density ρ of the metal oxide is ρ≤3.5g / cm 3 Furthermore, the density ρ of the metal oxide is ρ≤3g / cm 3 .

[0062] In some embodiments, the density ρ of the metal oxide is in the range of: 2.0 g / cm 3 ≤ρ≤4.0g / cm 3 Specifically, the density ρ of the metal oxide may be, but is not limited to, 2.0 g / cm 3 , 2.2g / cm 3 , 2.4g / cm 3 , 2.6g / cm 3 , 2.8g / cm 3 、3.0g / cm 3 、3.2g / cm 3 、3.4g / cm 3 、3.6g / cm 3 、3.8g / cm 3 , 4.0g / cm 3 If the density ρ of the metal oxide is too low, the material requirements are too high, or even fail to meet the requirements; if the density ρ of the metal oxide is too high, the metal oxide is easy to settle, so that the metal oxide in the wear-resistant layer 10 runs more to the side close to the flexible resin layer 30, and the content of the metal oxide on the side of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, so that the distribution of the metal oxide in the wear-resistant layer 10 is uneven, and the content of the metal oxide in the part of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, thereby reducing the hardness and wear resistance of the wear-resistant layer 10; in addition, the metal oxide is easy to agglomerate, so that the acrylic resin phase is discontinuous, and the wear-resistant layer 10 is prone to defects, holes, etc., which affects the appearance of the wear-resistant layer 10, reduces the mechanical strength and elongation at break of the wear resistance, and reduces the bending performance of the wear-resistant layer 10.

[0063] In some embodiments of the present application, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive is in the range of: 0.2%≤w%≤2%. Specifically, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive may be, but is not limited to, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, etc. If the mass fraction of the anti-fingerprint additive in the wear-resistant layer 10 is too low, the water contact angle of the wear-resistant layer 10 is reduced, and the anti-fingerprint performance and anti-fouling performance of the wear-resistant layer 10 are reduced; if the mass fraction of the anti-fingerprint additive in the wear-resistant layer 10 is too high, the surface hardness and wear resistance of the wear-resistant layer 10 are affected.

[0064] Furthermore, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive is in the range of 0.5%≤w%≤1.6%. In this way, the wear-resistant layer 10 can have both good anti-fingerprint performance and low cost.

[0065] Furthermore, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive is in the range of 0.8%≤w%≤1.3%. In this way, the wear-resistant layer 10 can have both good anti-fingerprint performance and low cost.

[0066] Optionally, the anti-fingerprint additive may be, but is not limited to, at least one of perfluoropolyether, a derivative of perfluoropolyether, silicone, tetrafluoroethylene, metal fluoride (such as magnesium fluoride, aluminum fluoride, etc.), and the like.

[0067] Optionally, the water drop angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30 is greater than 105°. Further, the water drop angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30 is greater than 110°. Further, the water drop angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30 is greater than 115°.

[0068] In some embodiments of the present application, the pencil hardness PH of the wear-resistant layer 10 is: PH ≥ 8H. Furthermore, the pencil hardness PH of the wear-resistant layer 10 is: PH ≥ 9H. The wear-resistant layer 10 of the embodiment of the present application is prepared by acrylic resin, metal oxide and anti-fingerprint additives, so that the wear-resistant layer 10 has a pencil hardness greater than or equal to 8H, so that the wear-resistant layer 10 has high wear resistance and is not easily scratched or worn, thereby greatly improving the service life of the wear-resistant layer 10. In addition, the cover plate 100 of the embodiment of the present application is applied to a foldable electronic device. When it is used as a protective layer for a flexible display screen, since the wear-resistant layer 10 has good wear resistance and hardness, there is no need to set a screen protection layer on the cover plate 100, thereby reducing the preparation cost and thickness of the flexible display screen assembly.

[0069] It should be noted that the pencil hardness test in the embodiment of the present application adopts GB / T 6739-2006 to measure the 1kg pencil hardness.

[0070] Optionally, the thickness of the wear-resistant layer 10 may be 5 μm to 30 μm. Further, the thickness of the wear-resistant layer 10 may be 5 μm to 25 μm. Further, the thickness of the wear-resistant layer 10 may be 10 μm to 20 μm. Specifically, the thickness of the wear-resistant layer 10 may be, but not limited to, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 27 μm, 30 μm, etc. If the thickness of the wear-resistant layer 10 is too thick, the bending performance of the cover plate 100 is reduced, making the cover plate 100 prone to cracking when bending. If the thickness of the wear-resistant layer 10 is too thin, the surface hardness of the cover plate 100 is reduced, thereby reducing the hardness of the wear-resistant layer 10, and the wear-resistant layer 10 may not even have an anti-scratch effect. When the thickness of the wear-resistant layer 10 is 5 μm to 30 μm, the cover plate 100 can have good wear resistance and scratch resistance, and can also have good bending performance, and is not prone to cracking after more bending times.

[0071] In some embodiments, the flexible resin layer 30 may be, but is not limited to, a polyimide layer (PI), such as a transparent polyimide layer (Colorless polyimide, CPI for short) or a thermoplastic polyimide layer (TPI for short).

[0072] Optionally, the thickness of the flexible resin layer 30 may be 25 μm to 80 μm. Specifically, the thickness of the flexible resin layer 30 may be, but is not limited to, 25 μm, 27 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 43 μm, 45 μm, 48 μm, 50 μm, 53 μm, 55 μm, 58 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, etc. If the thickness of the flexible resin layer is too thin, the difficulty of the preparation process will increase (such as coating will be difficult), the cost will increase, and the mechanical properties of the cover such as impact resistance will be reduced. In addition, the pencil hardness of the cover is reduced, the wear resistance is poor, and the cover is prone to bending and deformation; if the flexible resin layer is too thick, the bending performance of the cover is reduced, and the stress is too large during repeated bending, and there is a risk of breakage.

[0073] In some embodiments, when the cover plate is applied to the flexible display screen assembly and the flexible display screen assembly is folded inward, the thickness of the flexible resin layer is 25 μm to 50 μm.

[0074] In some other embodiments, when the cover plate is applied to a flexible display screen assembly, and the flexible display screen assembly is folded outward or the flexible display screen assembly is a roll-up screen, the thickness of the flexible resin layer is 50 μm to 80 μm.

[0075] In some embodiments, the elastic modulus E of the buffer layer 50 is in the range of 0.1 MPa≤E≤1.5 Gpa. Specifically, the elastic modulus E of the buffer layer 50 may be, but is not limited to, 0.1 MPa, 0.5 MPa, 1 MPa, 5 MPa, 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa, 60 MPa, 70 MPa, 80 MPa, 90 MPa, 100 MPa, 200 MPa, 300 MPa, 400 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1 Gpa, 1.1 Gpa, 1.2 Gpa, 1.3 Gpa, 1.4 Gpa, and 1.5 Gpa. If the elastic modulus E of the buffer layer 50 is too low, the buffering property does not have the ability to absorb impact, and it is difficult to improve the impact resistance of the cover plate 100, and the contribution is limited. If the elastic modulus E of the buffer layer 50 is too high, the bending performance of the buffer layer 50 is poor, thereby reducing the bending performance of the cover plate 100. When used to protect a flexible display screen, it is easy for the cover plate 100 to fall off the flexible display screen or the cover plate 100 to break as a whole.

[0076] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 1 MPa≤E≤1 GPa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0077] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 1 MPa≤E≤700 MPa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0078] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 300 MPa≤E≤700 MPa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0079] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 1Mpa≤E≤100Mpa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0080] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 10Mpa≤E≤80Mpa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0081] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 25Mpa≤E≤70Mpa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0082] Optionally, the buffer layer 50 includes at least one of polyurethane, silicone, silicone rubber, acrylic resin, and polyolefin. When these materials are used as the buffer layer 50, when the buffer layer 50 is subjected to plasma or corona treatment, the buffer layer 50 has better plasma and corona resistance, so that the water drop angle of the surface of the buffer layer 50 away from the flexible resin layer 30 can be better reduced, and the adhesion of the buffer layer 50 to the adhesive layer can be improved, so that the cover plate 100 can be attached to the flexible display screen, and it is less likely to fall off or delaminate during the folding and flattening of the foldable electronic device, and can withstand more bending. In addition, these materials have good shear thickening properties, such as common non-Newtonian fluids such as silicone rubber, whose modulus can increase by orders of magnitude under high-speed impact; furthermore, these materials can absorb impact energy through their own compression.

[0083] Optionally, the buffer layer 50 can be formed by: applying a glue composed of raw material components of the buffer layer 50 to the surface of the flexible resin layer 30 away from the wear-resistant layer 10, and curing it; plasma treating or corona treating the surface of the buffer layer 50 away from the flexible resin layer 30, so that the water contact angle (also known as the water drop angle) θ of the surface of the buffer layer 50 away from the flexible resin layer 30 is: θ≤30°.

[0084] In some embodiments of the present application, the buffer layer 50 is also used to adjust the color of the cover plate 100 , and the yellowness index YI of the cover plate 100 is: YI<2.

[0085] It can be understood that the buffer layer 50 has a color, and the buffer layer 50 is used to adjust the color of the cover plate 100 so that the cover plate 100 appears as transparent and colorless as possible, so as to avoid the color of the cover plate 100 affecting the light output efficiency of the flexible display screen when the cover plate 100 is applied to the flexible display screen, and affecting the color of the picture displayed on the flexible display screen, thereby affecting the display effect of the flexible display screen.

[0086] Further, the yellowness index YI of the cover plate 100 is: 0<YI<2. Specifically, the yellowness index YI of the cover plate 100 may be, but not limited to, YI<1.8, YI<1.5, YI<1.3, YI<1.0, YI<0.8, YI<0.5. Exemplarily, the yellowness index YI of the cover plate 100 may be, but not limited to, 1.99, 1.8, 1.6, 1.4, 1.2, 1.0, 0.8, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, etc. The smaller the yellowness index of the cover plate 100, the smaller the yellowness of the cover plate 100, the higher the transparency of the cover plate 100, and the less it will affect the display effect of the flexible display when applied to the flexible display; the larger the yellowness index of the cover plate 100, the yellower the color of the cover plate 100, the lower the transparency of the cover plate 100, and the display effect of the flexible display when applied to the flexible display. When the yellowness index YI of the cover plate 100 is: YI<2, when the cover plate 100 is applied to the flexible display, the display effect of the flexible display is small.

[0087] Optionally, the coordinate b of the Lab color space of the cover plate 100 is: b<2. Further, the coordinate b of the Lab color space of the cover plate 100 is: 0<b<2. Specifically, the coordinate b of the Lab color space of the cover plate 100 may be, but not limited to, b<1.8, b<1.5, b<1.3, b<1.0, b<0.8, b<0.5. Exemplarily, the coordinate b of the Lab color space of the cover plate 100 may be, but not limited to, 1.99, 1.8, 1.6, 1.4, 1.2, 1.0, 0.8, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, etc. The smaller the coordinate b of the Lab color space of the cover plate 100, the less yellow the cover plate 100 is, the higher the transparency of the cover plate 100 is, and when applied to a flexible display screen, it will not affect the display effect of the flexible display screen; the larger the coordinate b of the Lab color space of the cover plate 100, the yellower the color of the cover plate 100 is, the lower the transparency of the cover plate 100 is, and when applied to a flexible display screen, it will affect the display effect of the flexible display screen. When the coordinate b of the Lab color space of the cover plate 100 is: b<2, when the cover plate 100 is applied to a flexible display screen, the display effect on the flexible display screen is small.

[0088] In a specific embodiment, the flexible resin layer 30 is yellow, the buffer layer 50 is blue, the yellowness index YI of the cover plate 100 is 1 to 1.5, and the coordinate b of the Lab color space of the cover plate 100 is 1 to 1.5.

[0089] Optionally, the thickness of the buffer layer 50 may be 10 μm to 60 μm. Further, the thickness of the buffer layer 50 may be 20 μm to 60 μm. Further, the thickness of the buffer layer 50 may be 25 μm to 50 μm. Further, the thickness of the buffer layer 50 may be 30 μm to 40 μm. Specifically, the thickness of the buffer layer 50 may be, but not limited to, 10 μm, 15 μm, 20 μm, 25 μm, 27 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 43 μm, 45 μm, 48 μm, 50 μm, 53 μm, 55 μm, 58 μm, 60 μm, etc. If the thickness of the buffer layer 50 is too small, the improvement of the impact resistance of the cover plate 100 is limited; if the thickness of the buffer layer 50 is too thick, the overall thickness of the cover plate 100 is increased, and the bending performance of the cover plate 100 is reduced.

[0090] Please see again Figure 1 and Figure 2 The embodiment of the present application further provides a cover plate 100, which includes a wear-resistant layer 10, a flexible resin layer 30 and a buffer layer 50. The wear-resistant layer 10 includes acrylic resin, metal oxide and anti-fingerprint additives; the flexible resin layer 30 is stacked on one side of the wear-resistant layer 10; and the buffer layer 50 is stacked on the side of the flexible resin layer 30 away from the wear-resistant layer 10.

[0091] The cover plate 100 of the embodiment of the present application includes a buffer layer 50, a flexible resin layer 30 and a wear-resistant layer 10 which are stacked in sequence. The buffer layer 50 has a buffering effect. When the cover plate 100 is impacted by an external force, the buffer layer 50 deforms to absorb the external impact force, thereby improving the impact resistance of the cover plate 100, so that the cover plate 100 has good impact resistance; the flexible resin layer 30 enables the cover plate 100 to have good bending performance, thereby having a smaller bending radius; the wear-resistant layer 10 includes acrylic resin, metal oxide and anti-fingerprint additives. Acrylic resin is used as the matrix of the wear-resistant layer 10, the metal oxide can improve the wear resistance and hardness of the wear-resistant layer 10, and the anti-fingerprint additive can increase the water contact angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30, so that the wear-resistant layer 10 also has a good anti-fingerprint effect and is not easy to be scratched or worn, so that the cover plate 100 has a longer service life. Furthermore, the cover plate 100 of the embodiment of the present application has a lower cost.

[0092] In some embodiments of the present application, the mass ratio M of the acrylic resin to the metal oxide is in the range of 1≤M≤5. Specifically, the mass ratio M of the acrylic resin to the metal oxide can be, but is not limited to, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc. If the mass ratio M of the acrylic resin to the metal oxide is too small, it means that the content of the acrylic resin is reduced and the content of the metal oxide is increased, which will reduce the flexibility of the wear-resistant layer 10, improve the brittleness of the wear-resistant layer 10, and reduce the bending performance of the wear-resistant layer 10; if the mass ratio M of the acrylic resin to the metal oxide is too large, it means that the content of the acrylic resin is increased and the content of the metal oxide is reduced. Although the wear-resistant layer 10 has good toughness and bending performance, it will reduce the hardness and wear resistance of the wear-resistant layer 10. When the mass ratio M of the acrylic resin to the metal oxide is in the range of 1≤M≤5, the wear-resistant layer 10 has high hardness and wear resistance while ensuring good toughness and bending performance.

[0093] Furthermore, the mass ratio M of the acrylic resin to the metal oxide is in the range of 2≤M≤5. In this way, the wear-resistant layer 10 can have good toughness and bending performance, as well as high hardness and wear resistance.

[0094] Furthermore, the mass ratio M of the acrylic resin to the metal oxide is in the range of 3≤M≤5. In this way, the wear-resistant layer 10 can have good toughness and bending performance, as well as high hardness and wear resistance.

[0095] Furthermore, the mass ratio M of the acrylic resin to the metal oxide is in the range of 3≤M≤4.5. In this way, the wear-resistant layer 10 can have good toughness and bending performance, as well as high hardness and wear resistance.

[0096] In some embodiments, the mass fraction of the acrylic resin in the wear-resistant layer 10 ranges from 49.5% to 83.1%. Further, the mass fraction of the acrylic resin in the wear-resistant layer 10 ranges from 60% to 80%. Further, the mass fraction of the acrylic resin in the wear-resistant layer 10 ranges from 70% to 83.1%. Specifically, the mass fraction of the acrylic resin in the wear-resistant layer 10 can be, but is not limited to, 49.5%, 53%, 55%, 60%, 65%, 70%, 75%, 80%, 83.1%, etc.

[0097] In the embodiments of the present application, when a numerical value ranges from a to b is involved, unless otherwise specified, it means that the numerical value can be any numerical value between a and b, including the endpoint numerical value a and the endpoint numerical value b.

[0098] In some embodiments, the mass fraction of the metal oxide in the wear-resistant layer 10 ranges from 16.7% to 49.5%. Further, the mass fraction of the metal oxide in the wear-resistant layer 10 ranges from 16.7% to 40%. Further, the mass fraction of the metal oxide in the wear-resistant layer 10 ranges from 18% to 25%. Specifically, the mass fraction of the metal oxide in the wear-resistant layer 10 may be, but is not limited to, 16.7%, 20%, 25%, 30%, 35%, 40%, 45%, 49.5%, etc.

[0099] Optionally, the acrylic resin may be, but is not limited to, at least one of a light-curing (such as ultraviolet light-curing, UV-curing for short) acrylic resin and a heat-curing acrylic resin.

[0100] In some embodiments, the acrylic resin is a photocurable resin, and the raw material components of the wear-resistant layer 10 include acrylic resin monomers, metal oxides, anti-fingerprint additives and photoinitiators. Optionally, the wear-resistant layer 10 is prepared by the following steps: 1) mixing acrylic resin monomers, metal oxides, anti-fingerprint additives and photoinitiators according to a preset ratio to form a slurry; 2) applying the slurry to the surface of the flexible resin layer 30 to form a glue layer; 3) irradiating with a mercury lamp or an LED lamp to cure the glue layer to form the wear-resistant layer 10. Optionally, the photoinitiator can be, but is not limited to, at least one of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide (TPO for short), propylthioxanthone (ITX for short), benzophenone (BP for short), etc.

[0101] Optionally, the metal oxide includes at least one of aluminum oxide, silicon oxide, zirconium oxide, boehmite, magnesium oxide, cerium oxide, and barium oxide.

[0102] In some embodiments of the present application, the average particle size D of the metal oxide is in the range of 50 nm ≤ D ≤ 1 μm. Specifically, the average particle size D of the metal oxide may be, but is not limited to, 50 nm, 60 nm, 80 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, or 1 μm. If the average particle size D of the metal oxide is too large, the metal oxide is easy to settle in the acrylic resin system, so that the metal oxide in the wear-resistant layer 10 runs more toward the side close to the flexible resin layer 30, and the content of the metal oxide on the side of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, so that the distribution of the metal oxide in the wear-resistant layer 10 is uneven, and the content of the metal oxide in the part of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, thereby reducing the hardness and wear resistance of the wear-resistant layer 10; if the average particle size D of the metal oxide is too small, the metal oxide is easy to agglomerate, making the acrylic resin phase discontinuous, and the wear-resistant layer 10 is prone to defects, holes, etc., which affects the appearance of the wear-resistant layer 10, and reduces the mechanical strength and elongation at break of the wear-resistant layer 10, and reduces the bending performance of the wear-resistant layer 10. When the average particle size D of the metal oxide is in the range of 50nm≤D≤1μm, the metal oxide is not easy to agglomerate and settle in the acrylic resin, has good dispersibility, can better improve the wear resistance and hardness of the wear-resistant layer 10, and make the wear-resistant layer 10 have better impact strength and bending performance.

[0103] Furthermore, the range of the average particle size D of the metal oxide is: 50nm≤D≤200nm. When the average particle size D of the metal oxide is between 50nm and 200nm, the metal oxide is less likely to agglomerate and settle in the acrylic resin, has better dispersibility, can better improve the wear resistance and hardness of the wear-resistant layer 10, and make the wear-resistant layer 10 have better impact strength and bending performance.

[0104] In some embodiments of the present application, the Vickers hardness of the metal oxide is greater than or equal to 800 HV. Further, the Vickers hardness of the metal oxide may be, but is not limited to, greater than or equal to 1000 HV, greater than or equal to 1200 HV, greater than or equal to 1500 HV, or greater than or equal to 2000 HV.

[0105] In some embodiments, the Vickers hardness of the metal oxide ranges from 800HV to 5000HV. Further, the Vickers hardness of the metal oxide ranges from 800HV to 4000HV. Further, the Vickers hardness of the metal oxide ranges from 1200HV to 4000HV. Further, the Vickers hardness of the metal oxide ranges from 1500HV to 3000HV. Further, the Vickers hardness of the metal oxide ranges from 1800HV to 2500HV. Specifically, the Vickers hardness of the metal oxide may be, but is not limited to, 800HV, 900HV, 1000HV, 1300HV, 1500HV, 1800HV, 2000HV, 2500HV, 3000HV, 3500HV, 4000HV, 4500HV, 5000HV, etc. If the Vickers hardness of the metal oxide is too low, the improvement of the hardness and wear resistance of the wear-resistant layer 10 is limited. If the Vickers hardness of the metal oxide is too high, although the hardness and wear resistance of the wear-resistant layer 10 can be better improved, the cost of the material is increased and may even be unattainable.

[0106] In this embodiment, the Vickers hardness of the metal oxide is greater than or equal to 800 HV, and has a relatively high Vickers hardness, so that only a relatively small amount of metal oxide is required to be added to improve the hardness and wear resistance of the wear-resistant layer 10. At the same time, due to the relatively small amount of metal oxide added and the relatively large content of acrylic resin, the wear-resistant layer 10 has better toughness and bending properties, and the cover plate 100 has a smaller bending radius.

[0107] In some embodiments, the density of the metal oxide is ρ≤4.0 g / cm 3 Furthermore, the density ρ of the metal oxide is ρ≤3.5g / cm 3 Furthermore, the density ρ of the metal oxide is ρ≤3g / cm 3 .

[0108] In some embodiments, the density ρ of the metal oxide is in the range of: 2.0 g / cm 3 ≤ρ≤4.0g / cm 3 Specifically, the density ρ of the metal oxide may be, but is not limited to, 2.0 g / cm 3 , 2.2g / cm 3 , 2.4g / cm 3 , 2.6g / cm 3 , 2.8g / cm 3 、3.0g / cm 3 、3.2g / cm 3 、3.4g / cm 3 、3.6g / cm 3 、3.8g / cm3 , 4.0g / cm 3 If the density ρ of the metal oxide is too low, the material requirements are too high, or even fail to meet the requirements; if the density ρ of the metal oxide is too high, the metal oxide is easy to settle, so that the metal oxide in the wear-resistant layer 10 runs more to the side close to the flexible resin layer 30, and the content of the metal oxide on the side of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, so that the distribution of the metal oxide in the wear-resistant layer 10 is uneven, and the content of the metal oxide in the part of the wear-resistant layer 10 away from the flexible resin layer 30 is reduced, thereby reducing the hardness and wear resistance of the wear-resistant layer 10; in addition, the metal oxide is easy to agglomerate, so that the acrylic resin phase is discontinuous, and the wear-resistant layer 10 is prone to defects, holes, etc., which affects the appearance of the wear-resistant layer 10, reduces the mechanical strength and elongation at break of the wear resistance, and reduces the bending performance of the wear-resistant layer 10.

[0109] In some embodiments of the present application, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive is in the range of: 0.2%≤w%≤2%. Specifically, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive may be, but is not limited to, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, etc. If the mass fraction of the anti-fingerprint additive in the wear-resistant layer 10 is too low, the water contact angle of the wear-resistant layer 10 is reduced, and the anti-fingerprint performance and anti-fouling performance of the wear-resistant layer 10 are reduced; if the mass fraction of the anti-fingerprint additive in the wear-resistant layer 10 is too high, the surface hardness and wear resistance of the wear-resistant layer 10 are affected.

[0110] Furthermore, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive is in the range of 0.5%≤w%≤1.6%. In this way, the wear-resistant layer 10 can have both good anti-fingerprint performance and low cost.

[0111] Furthermore, in the wear-resistant layer 10, the mass fraction w% of the anti-fingerprint additive is in the range of 0.8%≤w%≤1.3%. In this way, the wear-resistant layer 10 can have both good anti-fingerprint performance and low cost.

[0112] Optionally, the anti-fingerprint additive may be, but is not limited to, perfluoropolyether or a derivative of perfluoropolyether or other perfluoropolyether-based substances.

[0113] Optionally, the water drop angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30 is greater than 105°. Further, the water drop angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30 is greater than 110°. Further, the water drop angle of the surface of the wear-resistant layer 10 away from the flexible resin layer 30 is greater than 115°.

[0114] In some embodiments of the present application, the pencil hardness PH of the wear-resistant layer 10 is: PH ≥ 8H. Furthermore, the pencil hardness PH of the wear-resistant layer 10 is: PH ≥ 9H. The wear-resistant layer 10 of the embodiment of the present application is prepared by acrylic resin, metal oxide and anti-fingerprint additives, so that the wear-resistant layer 10 has a pencil hardness greater than or equal to 8H, so that the wear-resistant layer 10 has high wear resistance and is not easily scratched or worn, thereby greatly improving the service life of the wear-resistant layer 10. In addition, the cover plate 100 of the embodiment of the present application is applied to a foldable electronic device. When it is used as a protective layer for a flexible display screen, since the wear-resistant layer 10 has good wear resistance and hardness, there is no need to set a screen protection layer on the cover plate 100, thereby reducing the preparation cost and thickness of the flexible display screen assembly.

[0115] It should be noted that the pencil hardness test in the embodiment of the present application adopts GB / T6739-2006 to measure the 1kg pencil hardness.

[0116] Optionally, the thickness of the wear-resistant layer 10 may be 5 μm to 30 μm. Further, the thickness of the wear-resistant layer 10 may be 5 μm to 25 μm. Further, the thickness of the wear-resistant layer 10 may be 10 μm to 20 μm. Specifically, the thickness of the wear-resistant layer 10 may be, but not limited to, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 27 μm, 30 μm, etc. If the thickness of the wear-resistant layer 10 is too thick, the bending performance of the cover plate 100 is reduced, making the cover plate 100 prone to cracking when bending. If the thickness of the wear-resistant layer 10 is too thin, the surface hardness of the cover plate 100 is reduced, thereby reducing the hardness of the wear-resistant layer 10, and the wear-resistant layer 10 may not even have an anti-scratch effect. When the thickness of the wear-resistant layer 10 is 5 μm to 30 μm, the cover plate 100 can have good wear resistance and scratch resistance, and can also have good bending performance, and is not prone to cracking after more bending times.

[0117] In some embodiments, the flexible resin layer 30 may be, but is not limited to, a polyimide layer, such as a transparent polyimide layer (Colorless polyimide, CPI for short) or a thermoplastic polyimide layer (TPI for short).

[0118] Optionally, the thickness of the flexible resin layer 30 may be 25 μm to 80 μm. Specifically, the thickness of the flexible resin layer 30 may be, but is not limited to, 25 μm, 27 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 43 μm, 45 μm, 48 μm, 50 μm, 53 μm, 55 μm, 58 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, etc. If the thickness of the flexible resin layer is too thin, the difficulty of the preparation process will increase (such as coating will be difficult), the cost will increase, and the mechanical properties of the cover such as impact resistance will be reduced. In addition, the pencil hardness of the cover is reduced, the wear resistance is poor, and the cover is prone to bending and deformation; if the flexible resin layer is too thick, the bending performance of the cover is reduced, and the stress is too large during repeated bending, and there is a risk of breakage.

[0119] In some embodiments, when the cover plate is applied to the flexible display screen assembly and the flexible display screen assembly is folded inward, the thickness of the flexible resin layer is 25 μm to 50 μm.

[0120] In some other embodiments, when the cover plate is applied to a flexible display screen assembly, and the flexible display screen assembly is folded outward or the flexible display screen assembly is a roll-up screen, the thickness of the flexible resin layer is 50 μm to 80 μm.

[0121] In some embodiments, the elastic modulus E of the buffer layer 50 is in the range of 0.1 MPa≤E≤1.5 Gpa. Specifically, the elastic modulus E of the buffer layer 50 may be, but is not limited to, 0.1 MPa, 0.5 MPa, 1 MPa, 5 MPa, 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa, 60 MPa, 70 MPa, 80 MPa, 90 MPa, 100 MPa, 200 MPa, 300 MPa, 400 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1 Gpa, 1.1 Gpa, 1.2 Gpa, 1.3 Gpa, 1.4 Gpa, and 1.5 Gpa. If the elastic modulus E of the buffer layer 50 is too low, the buffering property does not have the ability to absorb impact, and it is difficult to improve the impact resistance of the cover plate 100, and the contribution is limited. If the elastic modulus E of the buffer layer 50 is too high, the bending performance of the buffer layer 50 is poor, thereby reducing the bending performance of the cover plate 100. When used to protect a flexible display screen, it is easy for the cover plate 100 to fall off the flexible display screen or the cover plate 100 to break as a whole.

[0122] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 1 MPa≤E≤1 GPa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0123] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 1 MPa≤E≤700 MPa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0124] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 300 MPa≤E≤700 MPa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0125] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 1Mpa≤E≤100Mpa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0126] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 10Mpa≤E≤80Mpa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0127] Furthermore, the elastic modulus E of the buffer layer 50 is in the range of 25Mpa≤E≤70Mpa. In this way, the buffer layer 50 can have good buffering performance and good bending performance.

[0128] Optionally, the buffer layer 50 includes at least one of polyurethane, silicone, silicone rubber, acrylic resin, and polyolefin. When these materials are used as the buffer layer 50, when the buffer layer 50 is subjected to plasma or corona treatment, the buffer layer 50 has better plasma and corona resistance, so that the water drop angle of the surface of the buffer layer 50 away from the flexible resin layer 30 can be better reduced, and the adhesion of the buffer layer 50 to the adhesive layer can be improved, so that the cover plate 100 can be attached to the flexible display screen, and it is less likely to fall off or delaminate during the folding and flattening of the foldable electronic device, and can withstand more bending. In addition, these materials have good shear thickening properties, such as common non-Newtonian fluids such as silicone rubber, whose modulus can increase by orders of magnitude under high-speed impact; furthermore, these materials can absorb impact energy through their own compression.

[0129] Optionally, the buffer layer 50 can be prepared by the following steps: applying a glue solution composed of raw material components of the buffer layer 50 to the surface of the flexible resin layer 30 away from the wear-resistant layer 10, and curing it; plasma treating or corona treating the surface of the buffer layer 50 away from the flexible resin layer 30, so that the water contact angle (also known as the water drop angle) θ of the surface of the buffer layer 50 away from the flexible resin layer 30 is: θ≤30°.

[0130] In some embodiments of the present application, the buffer layer 50 is also used to adjust the color of the cover plate 100 , and the yellowness index YI of the cover plate 100 is: YI<2.

[0131] It can be understood that the buffer layer 50 has a color, and the buffer layer 50 is used to adjust the color of the cover plate 100 so that the cover plate 100 appears as transparent and colorless as possible, so as to avoid the color of the cover plate 100 affecting the light output efficiency of the flexible display screen when the cover plate 100 is applied to the flexible display screen, and affecting the color of the picture displayed on the flexible display screen, thereby affecting the display effect of the flexible display screen.

[0132] Further, the yellowness index YI of the cover plate 100 is: 0<YI<2. Specifically, the yellowness index YI of the cover plate 100 may be, but not limited to, YI<1.8, YI<1.5, YI<1.3, YI<1.0, YI<0.8, YI<0.5. Exemplarily, the yellowness index YI of the cover plate 100 may be, but not limited to, 1.99, 1.8, 1.6, 1.4, 1.2, 1.0, 0.8, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, etc. The smaller the yellowness index of the cover plate 100, the smaller the yellowness of the cover plate 100, the higher the transparency of the cover plate 100, and the less it will affect the display effect of the flexible display when applied to the flexible display; the larger the yellowness index of the cover plate 100, the yellower the color of the cover plate 100, the lower the transparency of the cover plate 100, and the display effect of the flexible display when applied to the flexible display. When the yellowness index YI of the cover plate 100 is: YI<2, when the cover plate 100 is applied to the flexible display, the display effect of the flexible display is small.

[0133] Optionally, the coordinate b of the Lab color space of the cover plate 100 is: b<2. Further, the coordinate b of the Lab color space of the cover plate 100 is: 0<b<2. Specifically, the coordinate b of the Lab color space of the cover plate 100 may be, but not limited to, b<1.8, b<1.5, b<1.3, b<1.0, b<0.8, b<0.5. Exemplarily, the coordinate b of the Lab color space of the cover plate 100 may be, but not limited to, 1.99, 1.8, 1.6, 1.4, 1.2, 1.0, 0.8, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, etc. The smaller the coordinate b of the Lab color space of the cover plate 100, the less yellow the cover plate 100 is, the higher the transparency of the cover plate 100 is, and when applied to a flexible display screen, it will not affect the display effect of the flexible display screen; the larger the coordinate b of the Lab color space of the cover plate 100, the yellower the color of the cover plate 100 is, the lower the transparency of the cover plate 100 is, and when applied to a flexible display screen, it will affect the display effect of the flexible display screen. When the coordinate b of the Lab color space of the cover plate 100 is: b<2, when the cover plate 100 is applied to a flexible display screen, the display effect on the flexible display screen is small.

[0134] In a specific embodiment, the flexible resin layer 30 is yellow, the buffer layer 50 is blue, the yellowness index YI of the cover plate 100 is 1 to 1.5, and the coordinate b of the Lab color space of the cover plate 100 is 1 to 1.5.

[0135] Optionally, the thickness of the buffer layer 50 may be 10 μm to 60 μm. Further, the thickness of the buffer layer 50 may be 20 μm to 60 μm. Further, the thickness of the buffer layer 50 may be 25 μm to 50 μm. Further, the thickness of the buffer layer 50 may be 30 μm to 40 μm. Specifically, the thickness of the buffer layer 50 may be, but not limited to, 10 μm, 15 μm, 20 μm, 25 μm, 27 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 43 μm, 45 μm, 48 μm, 50 μm, 53 μm, 55 μm, 58 μm, 60 μm, etc. If the thickness of the buffer layer 50 is too small, the improvement of the impact resistance of the cover plate 100 is limited; if the thickness of the buffer layer 50 is too thick, the overall thickness of the cover plate 100 is increased, and the bending performance of the cover plate 100 is reduced.

[0136] The cover plate 100 of the present application is further described below through specific embodiments.

[0137] Examples 1-5, Comparative Examples 1-2 and Comparative Examples 4-5

[0138] The cover plate 100 of each embodiment and comparative example includes a silicone layer (buffer layer 50), a polyimide layer (flexible resin layer 30) and a wear-resistant layer 10 which are stacked in sequence. The wear-resistant layer 10 includes acrylic resin, aluminum oxide and perfluoropolyether by mass fraction. The composition of acrylic resin, aluminum oxide and perfluoropolyether is shown in Table 1 below.

[0139] Comparative Example 3

[0140] The cover plate 100 of this embodiment includes a primer layer (Blue Primer), a polyimide layer (flexible resin layer 30 ), and a wear-resistant layer 10 which are sequentially stacked.

[0141] The above embodiments and comparative examples were subjected to various performance tests, and the test results are shown in Table 1 below.

[0142] 1) Pencil hardness test: GB / T6739-2006 is used to measure the 1kg pencil hardness.

[0143] 2) Haze and transmittance test: Use a transmittance haze meter for measurement.

[0144] 3) Wear resistance test: Use 0000# steel wool and 1Kg weight to rub the wear-resistant layer 10 side of the cover plate 100 back and forth. After rubbing for a certain number of times, measure the water drop angle of the wear-resistant layer 10 side of the cover plate 100. If the water drop angle drops by 15°, it means that the wear-resistant layer 10 loses its anti-fingerprint function. The more times the water drop angle drops by 15°, the better the wear resistance.

[0145] 4) Adhesion test: GB / T 4851-1998 is used for adhesion test.

[0146] 5) Pen dropping performance and ball dropping performance test: Use OCA glue to glue the cover plate 100 and the flexible display screen. Place the stacked cover plate 100 and the flexible display screen flat on a marble table with the cover plate 100 facing upward. Use a 12.5g M&G pen or a 4g steel ball to drop from a certain height to measure the height at which colored dots appear on the flexible display screen. The higher the height at which the colored dots appear, the better the pen dropping performance or ball dropping performance.

[0147] Table 1 Performance parameters of each embodiment and comparative example

[0148]

[0149] From the test results of Examples 1 to 3, Comparative Examples 1 and 2 in Table 1, it can be seen that the higher the content of metal oxide in the wear-resistant layer 10, the more times the wear-resistant layer 10 is worn and the better the wear resistance; however, as the content of metal oxide increases, the bending radius of the cover plate 100 increases and the bending performance decreases.

[0150] It can be seen from the test results of Example 2 and Comparative Example 3 that, compared with setting a primer layer on the surface of the flexible resin layer 30 away from the wear-resistant layer 10 (Comparative Example 3), setting a buffer layer 50 on the surface of the flexible resin layer 30 away from the wear-resistant layer 10 (Example 2) makes the cover plate 100 have better adhesion with the flexible display screen, and has better pen dropping performance and ball dropping performance (that is, better impact resistance), better wear resistance, but the bending performance is slightly reduced.

[0151] From the measurement results of Example 2, Examples 4-5, and Comparative Example 4-5, it can be seen that the larger the metal oxide particle size, the larger the bending radius of the cover plate 100, and the bending performance of the cover plate 100 decreases; in addition, the larger the metal oxide particle size, the lower the transmittance of the cover plate 100, but the decrease is not large.

[0152] Example 6 to Example 10

[0153] The cover plate 100 of each embodiment includes a buffer layer 50, a polyimide layer (flexible resin layer 30) and a wear-resistant layer 10 which are stacked in sequence. The wear-resistant layer 10 includes 75% acrylic resin, 24% aluminum oxide and 1% perfluoropolyether by mass fraction; the thickness of the buffer layer 50 is 25 μm, the thickness of the polyimide layer is 35 μm, and the thickness of the wear-resistant layer 10 is 15 μm. The buffer layer 50 of the cover plate 100 of each embodiment is treated by plasma.

[0154] The materials of the buffer layer 50 of each embodiment are shown in Table 2 below.

[0155] Comparative Example 6

[0156] The cover plate 100 of this comparative example includes a primer layer (BluePrimer), a polyimide layer (flexible resin layer 30) and a wear-resistant layer 10 which are stacked in sequence. The thickness of the primer layer is 800nm, the thickness of the polyimide layer is 35μm, and the thickness of the wear-resistant layer 10 is 15μm. The primer layer of the cover plate 100 of this comparative example is treated with plasma, the primer layer fails, the film layer is yellowish, and the light transmittance of the cover plate 100 is affected. The water drop angle of the cover plate 100 of this comparative example which has not been treated with plasma is shown in Table 2 below.

[0157] Table 2 Performance parameters of each embodiment and comparative example

[0158] Example Example 6 Example 7 Example 8 Example 9 Example 10 Comparative Example 6 Buffer layer material Silicone rubber Acrylic resin Polyolefins Polyurethane Primer layer Elastic modulus of buffer layer 100Kpa 1000Mpa 1500Mpa 100Mpa 500Mpa 100Mpa Water drop angle on the buffer surface 28° 15° 16° 27° 17° 80°

[0159] From the test results of Examples 6 to 10 and Comparative Example 6, it can be seen that the materials of the present application are used as buffer layers 50, and after plasma treatment, the water drop angles are all less than 30°. When applied to flexible display screens, the buffer layer 50 has better adhesion with the adhesive layer. When applied to foldable electronic devices, it is not easy to fall off or delaminate during the folding and flattening of the foldable electronic devices, and can withstand more bending times.

[0160] See also Figure 3 and Figure 4 The embodiment of the present application also provides a flexible display assembly 200, which includes a flexible display 210 and a cover plate 100 of the embodiment of the present application. The flexible display 210 has a display surface 211. The cover plate 100 is stacked on the display surface 211 of the flexible display 210 to protect the flexible display 210. The buffer layer 50 of the cover plate 100 is closer to the flexible display 210 than the wear-resistant layer 10 of the cover plate 100.

[0161] It can be understood that the flexible display screen 210, the buffer layer 50, the flexible resin layer 30 and the wear-resistant layer 10 are stacked in sequence.

[0162] Optionally, the flexible display screen 210 may be, but is not limited to, an organic flexible display screen 210 , such as an active matrix organic light emitting diode (AMOLED).

[0163] See also Figure 5 Optionally, the flexible display assembly 200 further includes an adhesive layer 230 , which is disposed between the flexible display 210 and the cover plate 100 and is used to adhere the cover plate 100 to the display surface 211 of the flexible display 210 .

[0164] Optionally, the adhesive layer 230 may be, but is not limited to, an adhesive layer with high light transmittance such as optical adhesive, pressure-sensitive adhesive, etc.

[0165] For a detailed description of the cover plate 100 , please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0166] It can be understood that the flexible display assembly 200 in this embodiment is only one form of the flexible display assembly 200 applied to the cover plate 100, and should not be understood as a limitation on the flexible display assembly 200 provided in this application, nor should it be understood as a limitation on the cover plate 100 provided in each embodiment of this application. For a detailed description of the cover plate 100, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0167] See also Figures 6 to 8The embodiment of the present application further provides a foldable electronic device 300, which includes: the flexible display assembly 200 of the embodiment of the present application, a foldable mechanism 310 and a processor 330, wherein the foldable mechanism 310 is used to carry the flexible display assembly 200 and to drive the flexible display assembly 200 to fold (such as Figure 7 as shown) or flattened (as Figure 6 As shown), so that the foldable electronic device 300 is in a folded state or a flattened state; wherein the cover plate 100 of the flexible display screen assembly 200 is farther away from the foldable mechanism 310 than the flexible display screen 210 of the flexible display screen assembly 200; the processor 330 is electrically connected to the flexible display screen assembly 200, and is used to control the flexible display screen assembly 200 to display.

[0168] The foldable electronic device 300 of the embodiment of the present application may be, but is not limited to, a portable foldable electronic device 300 with a variable display screen size such as a mobile phone, a tablet computer, an e-reader, and a laptop computer. It can be understood that the foldable electronic device 300 in this embodiment is only a form of the foldable electronic device 300 applied by the flexible display screen assembly 200, and should not be understood as a limitation on the foldable electronic device 300 provided in the present application, nor should it be understood as a limitation on the flexible display screen assembly 200 provided in each embodiment of the present application. For a detailed description of the flexible display screen assembly 200, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0169] For a detailed description of the flexible display screen assembly 200 , the cover plate 100 , etc., please refer to the description of the corresponding parts of the above embodiments, which will not be repeated here.

[0170] In some embodiments, the foldable mechanism 310 includes a first carrier 311, a connecting shaft 313 and a second carrier 315 that are movably connected in sequence; the first carrier 311, the connecting shaft 313 and the second carrier 315 are used to support the flexible display assembly 200 and drive the flexible display assembly 200 to fold or unfold; the foldable mechanism 310 has a flattened state and a folded state. When the foldable mechanism 310 is in the flattened state, the first carrier 311, the connecting member and the second carrier 315 form a planar structure; when the foldable mechanism 310 is in the folded state, the first carrier 311 overlaps with the second carrier 315 and drives the flexible display assembly 200 to fold.

[0171] It can be understood that the orthographic projection of the surface of the foldable mechanism 310 of the flexible display assembly 200 facing the flexible display assembly 200 falls within the range of the surface of the foldable mechanism 310 facing the flexible display assembly 200 .

[0172] Optionally, the processor 330 includes one or more general-purpose processors, wherein the general-purpose processor can be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, and an ASIC, etc. The processor 330 is used to execute various types of digital storage instructions, such as software or firmware programs stored in a memory, which enables the computing device to provide a wide variety of services.

[0173] Optionally, the foldable electronic device 300 of the present application further includes a memory 350. The memory 350 is electrically connected to the processor 330 and is used to store program codes required for the processor 330 to run, program codes required for controlling the flexible display assembly 200, display content of the flexible display assembly 200, and the like.

[0174] Optionally, the memory 350 may include a volatile memory (Volatile Memory), such as a random access memory (Random Access Memory, RAM); the memory 350 may also include a non-volatile memory (NVM), such as a read-only memory (Read-Only Memory, ROM), a flash memory (FlasDOLMemory, FM), a hard disk (DOLard Disk Drive, DOLDD) or a solid-state drive (SSD). The memory 350 may also include a combination of the above-mentioned types of memory.

[0175] In some embodiments, the foldable electronic device 300 of the embodiment of the present application further includes a camera module 370, which is carried by the foldable mechanism 310. The camera module 370 is electrically connected to the processor 330, and is used to take pictures under the control of the processor 330.

[0176] Optionally, the camera module 370 may be a rear camera module 370 or a front camera module 370 .

[0177] This application is not specifically limited. Mentioning "embodiment" and "implementation method" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrases in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, if there is no contradiction between them.

[0178] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the above preferred implementation modes, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A cover plate, characterized in that: include: Wear-resistant layer; A flexible resin layer, the flexible resin layer being stacked on one side of the wear-resistant layer; as well as A buffer layer is stacked on a side of the flexible resin layer away from the wear-resistant layer, and a water contact angle θ of a surface of the buffer layer away from the flexible resin layer is: θ≤30°.

2. The cover plate according to claim 1, characterized in that: The wear-resistant layer comprises acrylic resin, metal oxide and anti-fingerprint additive.

3. The cover plate according to claim 2, characterized in that: The mass ratio M of the acrylic resin to the metal oxide is in the range of 1≤M≤5.

4. The cover plate according to claim 2, characterized in that: In the wear-resistant layer, the mass fraction w% of the anti-fingerprint additive is in the range of 0.2%≤w%≤2%.

5. The cover plate according to claim 2, characterized in that: The range of the average particle size D of the metal oxide is: 50nm≤D≤1μm.

6. The cover plate according to claim 2, characterized in that: The Vickers hardness of the metal oxide is greater than or equal to 800 HV.

7. The cover plate according to any one of claims 1 to 6, characterized in that: The pencil hardness PH of the wear-resistant layer is: PH≥8H.

8. The cover plate according to claim 1, characterized in that: The elastic modulus E of the buffer layer is in the range of 0.1 MPa≤E≤1.5 Gpa.

9. The cover plate according to any one of claims 1 to 6 and 8, characterized in that: The buffer layer is also used to adjust the color of the cover plate. The yellowness index YI of the cover plate is: YI<2, and the coordinate b of the Lab color space of the cover plate is: b<2.

10. A cover plate, characterized in that: include: A wear-resistant layer, the wear-resistant layer comprising acrylic resin, metal oxide and anti-fingerprint additive; A flexible resin layer, the flexible resin layer being stacked on one side of the wear-resistant layer; as well as The buffer layer is stacked on a side of the flexible resin layer away from the wear-resistant layer.

11. The cover plate according to claim 10, characterized in that: The mass ratio M of the acrylic resin to the metal oxide is in the range of 1≤M≤5.

12. The cover plate according to claim 10, characterized in that: In the wear-resistant layer, the mass fraction w% of the anti-fingerprint additive is in the range of 0.2%≤w%≤2%.

13. The cover plate according to any one of claims 10 to 12, characterized in that: The pencil hardness PH of the wear-resistant layer is: PH≥8H.

14. The cover plate according to claim 10, characterized in that: The buffer layer has a buffering effect, and the elastic modulus E of the buffer layer is in the range of 0.1 MPa≤E≤1.5 Gpa.

15. The cover plate according to any one of claims 10 to 12 and 14, characterized in that: The buffer layer is also used to adjust the color of the cover plate. The yellowness index YI of the cover plate is: YI<2, and the coordinate b of the Lab color space of the cover plate is: b<2.

16. A flexible display screen assembly, characterized in that: include: A flexible display screen having a display surface; as well as The cover plate described in any one of claims 1 to 15 is stacked on the display surface of the flexible display screen to protect the flexible display screen, and the buffer layer of the cover plate is closer to the flexible display screen than the wear-resistant layer of the cover plate.

17. A foldable electronic device, characterized in that: include: The flexible display screen assembly according to claim 16; A foldable mechanism, the foldable mechanism is used to carry the flexible display screen assembly and drive the flexible display screen assembly to be folded or flattened, wherein the cover plate of the flexible display screen assembly is farther away from the foldable mechanism than the flexible display screen of the flexible display screen assembly; as well as A processor is electrically connected to the flexible display screen assembly and is used to control the flexible display screen assembly to display.

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