Cover plate, folding screen assembly and electronic device

Abstract

This application discloses a cover plate, a foldable screen assembly, and an electronic device. The cover plate includes a substrate and a protective layer. The substrate includes a bending portion and a flat portion. The bending portion includes a first surface and a second surface disposed opposite to each other. The second surface is a first arc-shaped surface and bends from the junction of the bending portion and the flat portion toward a direction closer to the first surface. The distance between the first surface and the second surface gradually increases in the direction of the fold line toward the junction of the bending portion and the flat portion. The protective layer covers the second surface, and the elastic modulus of the protective layer is less than the elastic modulus of the substrate. The cover plate provided by this application, by providing a protective layer on the second surface of the bending portion, and the second surface being an arc-shaped surface bent toward a direction closer to the first surface, can make the substrate have stronger impact resistance while taking into account the bending performance of the substrate.

Description

Technical Field

[0001] This application relates to the technical field of electronic device structures, and in particular to a cover plate, a foldable screen assembly, and an electronic device. Background Technology

[0002] UFG (Ultra Flexible Glass) is formed by etching a thicker UTG (Ultra-Thin Glass). UFG can be used as a cover glass for foldable screen phones. The folding area, or bending region, of UFG is typically etched to a thinner thickness to improve its bending resistance, while the non-bending areas maintain a greater thickness to ensure structural strength.

[0003] The bending section of non-uniform thickness ultra-thin glass is generally thinner to ensure its excellent bendability. However, due to the thinness of the bending section, its structural strength is too low, and it is easily damaged when subjected to impact. Summary of the Invention

[0004] One embodiment of this application provides a cover plate, including a substrate and a protective layer. The substrate includes a bent portion and flat portions disposed on opposite sides of the bent portion. The bent portion is capable of bending along a fold line and includes a first surface and a second surface disposed opposite to each other. The second surface is a first arcuate surface and bends from the junction of the bent portion and the flat portion toward a direction close to the first surface. The distance between the first surface and the second surface gradually increases in the direction of the fold line toward the junction of the bent portion and the flat portion. The protective layer covers the second surface. The elastic modulus of the protective layer is less than the elastic modulus of the substrate.

[0005] Another aspect of this application embodiment also provides a foldable screen assembly, the foldable screen assembly including a flexible screen and a cover plate, the flexible screen including a display surface and a non-display surface, and the cover plate covering the display surface of the flexible screen; wherein, the cover plate is the cover plate described in the foregoing embodiment.

[0006] In another aspect, this application provides an electronic device, which includes a foldable screen assembly, a mid-frame, and a housing, wherein the foldable screen assembly and the housing are respectively connected to opposite sides of the mid-frame; wherein the foldable screen assembly is the foldable screen assembly described in the foregoing embodiments.

[0007] The cover plate, foldable screen assembly, and electronic device provided in this application, by providing a protective layer on the second surface of the bent portion of the substrate, and the second surface being an arc-shaped surface bent towards the first surface, can enhance the substrate's impact resistance while maintaining its bending performance. Simultaneously, the elastic modulus of the protective layer is lower than that of the substrate, giving the protective layer a stronger buffering and energy absorption capacity, further improving the structural strength of the bent portion. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of the electronic device when unfolded in some embodiments of this application;

[0010] Figure 2 yes Figure 1 Schematic diagram of the structure of the electronic device when folded, as shown in the example;

[0011] Figure 3 yes Figure 1 An exploded view of the unfolded electronic device in the embodiment;

[0012] Figure 4 This is an exploded view of the foldable screen assembly in some embodiments of this application;

[0013] Figure 5 This is a partial cross-sectional schematic diagram of a foldable screen component in some embodiments of this application;

[0014] Figure 6 This is a partial cross-sectional structural diagram of the foldable screen assembly in some other embodiments of this application;

[0015] Figure 7 This is a partial cross-sectional structural diagram of the foldable screen assembly in some other embodiments of this application;

[0016] Figure 8 This is a partial cross-sectional structural diagram of the foldable screen component in some embodiments of this application;

[0017] Figure 9 This is a partial cross-sectional structural diagram of the foldable screen component in some embodiments of this application;

[0018] Figure 10 This is a partial cross-sectional structural diagram of the foldable screen component in some embodiments of this application;

[0019] Figure 11This is a partial cross-sectional structural diagram of the foldable screen component in some embodiments of this application;

[0020] Figure 12 This is a partial cross-sectional structural diagram of the foldable screen component in some embodiments of this application;

[0021] Figure 13 This is a partial cross-sectional structural diagram of the foldable screen assembly in some other embodiments of this application;

[0022] Figure 14 This is a partial cross-sectional structural diagram of the foldable screen assembly in some other embodiments of this application;

[0023] Figure 15 This is a partial cross-sectional structural diagram of the foldable screen assembly in some other embodiments of this application;

[0024] Figure 16 This is a partial cross-sectional structural diagram of the foldable screen assembly in some other embodiments of this application;

[0025] Figure 17 This is a schematic block diagram of the structure of an electronic device in some embodiments of this application. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] As used herein, “electronic device” (or simply “terminal”) includes, but is not limited to, means configured to receive / transmit communication signals via a wired connection (such as via a Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital Cable, Direct Cable Connection, and / or another data connection / network) and / or via a wireless interface (e.g., for cellular networks, Wireless Local Area Networks (WLANs), Digital Television Networks such as DVB-H networks, Satellite Networks, AM-FM Broadcast Transmitters, and / or another communication terminal). A communication terminal configured to communicate via a wireless interface may be referred to as a “wireless communication terminal,” a “wireless terminal,” or a “mobile terminal.” Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that may combine cellular radiotelephone with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notepads, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. A mobile phone is an electronic device equipped with a cellular communication module.

[0029] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the electronic device 100 in some embodiments of this application when unfolded. Figure 2 yes Figure 1 A schematic diagram of the structure of the electronic device 100 when folded, as described in the embodiment. Figure 3 yes Figure 1 Schematic diagram of the exploded structure of electronic device 100 when unfolded.

[0030] The electronic device provided in this application is a foldable electronic device, such as a mobile phone, tablet computer, or smartwatch. Its main advantages are that it combines entertainment and work functions, is easy to carry, and caters to current consumer demands for portability and diverse functionality. It should be noted that the electronic device in this application primarily refers to an electronic device with a foldable screen, such as a foldable screen phone. Foldable screen phones generally have inward or outward folding methods. For inward-folding foldable screen phones, after folding, the display surface of the flexible screen along the folding area (e.g., ...) Figure 1 The fold lines 101 shown are close to each other, indicating that the flexible screen is folded inwards. For foldable screen phones with an outward folding mechanism, after folding, the display surfaces of the flexible screen are opposite to each other along the folding area, indicating that the flexible screen is folded outwards.

[0031] The electronic device 100 may include a foldable screen assembly 10, a mid-frame 20, and a housing 30. The foldable screen assembly 10 and the housing 30 may be connected to opposite sides of the mid-frame 20, respectively. The mid-frame 20 may include a one-piece mid-plate 201 and a frame 202, both of which can be formed using processes such as injection molding, stamping, or thermoforming.

[0032] The frame 202 can be formed by extending the sidewall of the middle plate 201 in the thickness direction of the middle plate 201, so that the two opposite sides of the middle frame 20 can form corresponding open structures. The foldable screen assembly 10 and the housing 30 can respectively cover the open structures on the opposite sides of the middle frame 20, thereby forming a housing space for the electronic device 100 together with the middle frame 20. This housing space can be used to install electronic components required by the electronic device 100, such as batteries, sensors, circuit boards, and cameras.

[0033] In some embodiments, the middle plate 201 and the frame 202 may also be two independent structural components, which can be connected by one or a combination of assembly methods such as snap-fit, bonding, and welding. Alternatively, the middle frame 20 may consist only of the frame 202.

[0034] In addition, the materials of the middle frame 20 and the shell 30 can be glass, metal, and hard plastic, so that the middle frame 20 and the shell 30 have a certain structural strength.

[0035] Since the mid-frame 20 and housing 30 are generally directly exposed to the external environment, they can also possess certain properties such as wear resistance, corrosion resistance, and scratch resistance. Alternatively, a layer of functional material for wear resistance, corrosion resistance, and scratch resistance can be coated on the outer surface of the mid-frame 20 and housing 30 (i.e., the outer surface of the electronic device 100). Furthermore, in some embodiments, a corresponding brand logo can be provided on the mid-frame 20 or housing 30 to enhance the appearance of the electronic device 100 and improve brand recognition.

[0036] As mentioned above, the electronic device is a foldable electronic device. Specifically, the foldable screen assembly 10 of the electronic device 100 can be folded along the folding line 101 of the electronic device 100. The folding line 101 is located in the central region of the foldable screen assembly 10, and its extension direction is perpendicular to the folding direction of the foldable screen assembly 10. The foldable screen assembly 10 can fold synchronously with the folding of the electronic device 100. Optionally, the housing 30 may be provided with a folding mechanism, which can drive the housing 30 to fold, thereby driving the foldable screen assembly 10 to fold. This folding mechanism can be a hinge mechanism, a pivot mechanism, an elastic mechanism, etc. Detailed technical features of this part are beyond the understanding of those skilled in the art and will not be elaborated here. Of course, in other embodiments, the housing 30 is a stretchable or flexible structure, so that the housing 30 can fold synchronously with the foldable screen assembly 10.

[0037] Please see Figure 4 and Figure 5 , Figure 4 This is an exploded view of the foldable screen assembly 10 in some embodiments of this application. Figure 5 This is a partial cross-sectional schematic diagram of the foldable screen assembly 10 in some embodiments of this application.

[0038] The foldable screen assembly 10 may include a flexible screen 110 and a cover plate 120 covering the surface of the flexible screen 110. The flexible screen 110 is mainly used for displaying images and can also serve as an interactive interface. The flexible screen 110 can be a flexible display device such as OLED (Organic Light-Emitting Diode) to realize the image display function of electronic devices.

[0039] The flexible screen 110 may include a display surface 111 and a non-display surface 112. The display surface 111 is the side of the flexible screen 110 that can display images and allow interaction, while the non-display surface 112 is the side of the flexible screen 110 that faces away from the display surface 111.

[0040] The cover plate 120 covers one side of the display surface 111 of the flexible screen 110. The cover plate 120 can prevent external debris from scratching the display surface 111 of the flexible screen 110, thereby protecting the flexible screen 110 and improving its service life and display effect. When the folding screen assembly 10 is bent, the flexible screen 110 and the cover plate 120 bend together.

[0041] Furthermore, when the flexible screen 110 is bent, its bending area can be elongated. The length direction of the bending area of ​​the flexible screen 110 is perpendicular to the bending direction of the flexible screen 110 and corresponds to the central area of ​​the electronic device. The bending area of ​​the flexible screen 110 has a fold line, which is the fold line 101 of the electronic device. The fold line 101 coincides with the central axis of the flexible screen 110 that is parallel to the length direction of the bending area, and the flexible screen 110 can be bent along the fold line 101 when it is bent. The cover plate 120 covering the flexible screen 110 can be bent synchronously with the flexible screen 110, and the fold line of the flexible screen 110 is the fold line of the cover plate 120.

[0042] Please see Figure 6 and Figure 7 , Figure 6 This is a partial cross-sectional structural diagram of the foldable screen assembly 10 in other embodiments of this application. Figure 7 This is a partial cross-sectional structural diagram of the foldable screen assembly 10 in some other embodiments of this application. A cover plate 120 covers the display surface 111 of the flexible screen 110. The cover plate 120 may include a substrate 1210 and a protective layer 1220. The surface of the substrate 1210 may have a smooth and flat characteristic to facilitate touch operations such as clicking, swiping, and pressing. The substrate 1210 may be a transparent plate that can be bent. The thickness of the substrate 1210 is generally set to 20-100 μm. Optionally, the thickness of the substrate 1210 may be 20 μm, 30 μm, 50 μm, 70 μm, or 90 μm, etc. The substrate 1210 may be flexible glass (UTG, UFG) with an elastic modulus of 70-75 GPa, or it may be a flexible material such as polyimide (PI) or colorless polyimide (CPI). Optionally, the elastic modulus of the substrate can be 70 GPa, 71 GPa, 72 GPa, 73 GPa, or 74 GPa, etc.

[0043] In one embodiment, the substrate 1210 may include a bent portion 1211 and flat portions 1212 disposed on opposite sides of the bent portion 1211. The bent portion 1211 of the substrate 1210 is configured to form a bendable region with respect to the cover plate 120. The bent portion 1211 of the substrate 1210 may be elongated, and the bent portion 1211 of the substrate 1210 may be symmetrically disposed with respect to the fold line 101. When the substrate 1210 is bent, it can be bent along its bent portion 1211.

[0044] Furthermore, the bending portion 1211 may include a first surface 12111 and a second surface 12112 disposed opposite to each other. The first surface 12111 may be a plane, and the second surface 12112 may be a first arcuate surface 121120. The second surface 12112 is capable of bending from the junction of the bending portion 1211 and the flattened portion 1212 toward the direction closer to the first surface 12111. This results in the second surface 12112 forming a concave surface that is recessed toward the direction closer to the first surface 12111, and this concave surface is a smooth, uniformly curved arcuate surface.

[0045] The arc-shaped concave surface of the second surface 12112 ensures that the distance between the concave region of the second surface 12112 and the first surface 12111 is less than the thickness of the flat portions 1212 on both sides. In other words, the thickness of the concave region of the bending portion 1211 of the substrate 1210 is less than the thickness of the flat portions 1212 on both sides. For the substrate 1210, a thinner thickness makes it easier to bend. The low thickness of the bending portion 1211 gives the substrate 1210 better bending performance.

[0046] On the other hand, in the direction parallel to the fold line 101 on the bent portion 1211, the boundary line between the second surface 12112 and the two sides of the flattening portion 1212 is the two side lines of the second surface 12112. The cross-section of the second surface 12112 in the direction perpendicular to the fold line 101 is an arc segment, the center of which is located on the side of the second surface 12112 away from the first surface 12111. This makes the vertical distance between the arc segment and the first surface 12111 gradually decrease from its two ends to its midpoint. That is, in the direction perpendicular to the fold line 101 of the bent portion 1211, between the position of the boundary between the second surface 12112 and the flattening portion 1212 and the position of the fold line 101 on the second surface 12112, the distance between the first surface 12111 and the second surface 12112 gradually decreases, which also indicates that the thickness of the bent portion 1211 is less than the thickness of the flattening portions 1212 on both sides.

[0047] The second surface 12112 of the bent portion 1211 can be formed by chemical etching or by physical grinding and polishing. At the fold line 101 of the bent portion 1211, the distance between the second surface 12112 and the first surface 12111 can be 50%-80% of the thickness of the flat portion 1212. The distance between the boundary lines of the bent portion 1211 and the flat portions 1212 on both sides, that is, the distance between the two side edges of the second surface 12112, can be 0.5-2mm, for example, 0.5mm, 0.8mm, 1.2mm, or 1.5mm, etc., and the distance between the first surface 12111 and the second surface 12112 gradually increases in the direction from the fold line 101 toward the boundary between the bent portion 1211 and the flat portion 1212, so that the second surface 12112 of the bent portion 1211 is arranged as an arch bridge between the flat portions 1212 on both sides of the bent portion 1211.

[0048] Furthermore, the protective layer 1220 covers the second surface 12112 of the bent portion 1211, and the protective layer 1220 can make the second surface 12112 flat into a plane parallel to the first surface 12111, thereby ensuring the flatness of the cover plate 120.

[0049] Specifically, the protective layer 1220 can be an organic polymer material layer, such as a PU layer, a TPU layer, or an OCR layer. The elastic modulus of the protective layer 1220 is generally set to 20-8000 MPa. Optionally, the elastic modulus of the protective layer 1220 can be 100 MPa, 500 MPa, 1000 MPa, 3000 MPa, or 5000 MPa, etc.

[0050] Generally, the elastic modulus reflects a material's ability to resist deformation. A higher elastic modulus indicates stronger impact resistance, while a lower elastic modulus indicates stronger cushioning and energy absorption capabilities. In this application, the substrate 1210 is used to protect the flexible screen 110 and features scratch resistance, impact resistance, and abrasion resistance. Compared to the substrate 1210, the elastic modulus of the protective layer 1220 is much lower. Materials with lower elastic modulus have better cushioning and energy absorption advantages. The protective layer 1220 can absorb the impact force received at the bending portion 1211 of the substrate 1210, protecting the integrity of the bending portion 1211 and thus improving the structural strength of the bending portion 1211.

[0051] Please see Figure 6 and Figure 7The protective layer 1220 covers the second surface 12112 and is located only within the groove formed by the second surface 12112. The surface of the protective layer 1220 that contacts the second surface 12112 is an arc-shaped surface. The side of the protective layer 1220 away from the second surface 12112 is parallel to the first surface 12111 and is flush with the side of the flattening portion 1212 away from the first surface 12111.

[0052] like Figure 6 As shown, when the second surface 12112 is located between the first surface 12111 and the flexible screen 110, the groove formed by the second surface 12112 faces the display surface 111 of the flexible screen 110. When an external force acts on the bending portion 1211 of the substrate 1210 in a direction close to the flexible screen 110, the external force will act directly on the first surface 12111 and then be transmitted to the protective layer 1220 on the second surface 12112.

[0053] The side of the protective layer 1220 that contacts the second surface 12112 is equivalent to an arch bridge surface. When an external force is transmitted to the arch bridge surface, the arch bridge surface can disperse the external force transmitted to the protective layer 1220 into a force tangential to the arc-shaped surface where the arch bridge surface is located, and can gradually disperse and reduce along the bending direction of the arch bridge surface. The arch bridge structure of the protective layer 1220 can improve the impact resistance of the bent portion 1211 of the substrate 1210, thereby improving the structural strength of the bent portion 1211. Moreover, since the elastic modulus of the protective layer 1220 is relatively small, the protective layer 1220 can also buffer and absorb the force transmitted to its surface, further improving the structural strength of the bent portion 1211, so that the substrate 1210 has both good bending performance and stronger structural strength.

[0054] When the cover plate 120 is folded inward, the first surface 12111 of the bent portion 1211 of the substrate 1210 is subjected to a compressive force that moves toward the fold line 101. That is, the direction of the external force is toward the first surface 12111 of the bent portion 1211. At this time, the protective layer 1220 covers one side of the second surface 12112 in an arched manner. The arched surface can disperse the external force transmitted to its surface, giving the bent portion 1211 strong impact resistance and reducing the possibility of the bent portion 100 breaking when the cover plate 120 is folded inward.

[0055] When the cover plate 120 is folded outward, the first surface 12111 of the bent portion 1211 of the substrate 1210 is subjected to a tensile force away from the fold line 101, while its second surface 12112 is subjected to a compressive force moving towards the fold line 101. Since the second surface 12112 is covered with a protective layer 1220, the protective layer 1220 can buffer and absorb the force transmitted to its structure before the compressive force is transmitted to the second surface 12112, thereby reducing the impact force directly acting on the second surface 12112 when the cover plate 120 is folded outward, thus ensuring the structural strength of the bent portion 1211 and reducing the possibility of the bent portion 1211 breaking.

[0056] like Figure 7 As shown, when the second surface 12112 is located on the side of the first surface 12111 that is away from the display surface 111 of the flexible screen 110, the groove formed by the second surface 12112 is away from the flexible screen 110. When an external force acts on the bending portion 1211 on the substrate 1210 in a direction close to the flexible screen 110, the external force will directly act on the protective layer 1220 on the side of the second surface 12112, and then be transmitted from the protective layer 1220 to the bending portion 1211.

[0057] Because the elastic modulus of the protective layer 1220 is smaller than that of the substrate 1210, the protective layer 1220 has a stronger ability to buffer and absorb energy. The protective layer 1220 can buffer and absorb external forces acting on its structure, resulting in a smaller force transmitted to the second surface 12112 of the bending portion 1211, a smaller impact force on the bending portion 1211, and a reduced possibility of the bending portion 1211 breaking.

[0058] When the cover plate 120 is folded inward, the second surface 12112 of the bent portion 1211 is subjected to a compressive force in the direction close to the fold line 101. This compressive force can impact the second surface 12112 of the bent portion 1211. Since the second surface 12112 is covered with a protective layer 1220, the protective layer 1220 can buffer and absorb the compressive force acting on the second surface 12112, thereby reducing the direct pressure on the second surface 12112, improving the impact resistance of the bent portion 1211, and reducing the possibility of the bent portion 1211 breaking.

[0059] When the cover plate 120 is folded outward, the first surface 12111 of the bent portion 1211 is subjected to a compressive force in the direction close to the fold line 101, which is equivalent to an external force acting directly on the first surface 12111 of the bent portion 1211. The external force can be transmitted to the protective layer 1220 covering the second surface 12112 of the bent portion 1211, that is, the external force can be transmitted to the arch surface of the protective layer 1220. The arch surface of the protective layer 1220 can disperse the force transmitted to its surface and gradually reduce it along the bending direction of the arch surface, so that the bent portion 1211 has stronger impact resistance, thereby reducing the possibility of the bent portion breaking when the cover plate 120 is folded outward.

[0060] Please see Figure 8 , Figure 8 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in some embodiments of this application.

[0061] Unlike the above embodiments, in this embodiment, the protective layer 1220 covers the second surface 12112, and one end of the protective layer 1220 near the junction of the bent portion 1211 and the flattened portion 1212 extends to the surface of the flattened portion 1212 that contacts the second surface 12112. Simultaneously, the side of the protective layer 1220 facing away from the second surface 12112 is parallel to the surface of the flattened portion 1212. In other words, the protective layer 1220 completely covers the surface of the substrate 1210 near the flexible screen 110.

[0062] In this embodiment, the protective layer 1220 not only fills the groove structure formed by the second surface 12112, but also extends to the flattening portion 1212 to flatten the second surface 12112, making the cover plate 120 flatter. Furthermore, the protective layer 1220 directly and integrally covers the side surface where the flattening portion 1212 connects to the second surface 12112, and the second surface 12112 itself. This ensures that other structural components that need to be disposed on the protective layer 1220 side of the substrate 1210 can only be disposed on the protective layer 1220, preventing the substrate 1210 (including the bent portion 1211 and the flattening portion 1212), the protective layer 1220, and other structural components from contacting each other. This avoids large gaps at the intersection of the three components due to contact, thereby making the connection between the protective layer 1220 and the substrate 1210 tighter.

[0063] Furthermore, in some embodiments, when the protective layer 1220 is disposed on the surface of the substrate 1210 facing away from the flexible screen 110 (e.g. Figure 7 As shown, the protective layer 1220 can fully cover the side surface of the substrate 1210 facing away from the flexible screen 110.

[0064] Please see Figure 9 , Figure 9 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in some embodiments of this application.

[0065] Unlike the embodiments described above, the protective layer 1220 in this embodiment may include a first coating layer 1221 and a second coating layer 1222. The first coating layer 1221 is directly in contact with the second surface 12112, and is located between the second coating layer 1222 and the second surface 12112. Furthermore, the elastic modulus of the first coating layer 1221 is different from the elastic modulus of the second coating layer 1222.

[0066] When materials with different elastic moduli are stacked, those with a relatively larger elastic modulus exhibit stronger impact resistance, while those with a smaller elastic modulus demonstrate superior energy absorption and cushioning performance. The protective layer 1220, composed of materials with varying elastic moduli, ensures both impact resistance and energy absorption, thus providing more comprehensive protection. When the bent portion 1211 of the substrate 1210 is subjected to pressure from different directions, the protective layer 1220, with its combined impact resistance and energy absorption capabilities, provides better protection for the substrate 1210.

[0067] In this embodiment, the side surface of the second coating 1222 away from the first coating 1221 is parallel to the surface of the flattening portion 1212 connected to the second surface 12112. In addition to cooperating with the first coating 1221 to improve the structural strength of the substrate 1210, the second coating 1222 can also flatten the surface of the second surface 12112 and the flattening portion 1212 connected to it, ensuring the flatness of the cover plate 120.

[0068] like Figure 9 As shown, the thickness of the first coating 1221 gradually decreases from the fold line 101 of the bent portion 1211 towards the junction of the bent portion 1211 and the flattened portion 1212. Therefore, the thickness of the first coating 1221 at the fold line 101 of the bent portion 1211 is the greatest. Since the distance between the second surface 12112 and the first surface 12111 at the fold line 101 of the bent portion 1211 is the smallest, the structural strength of the bent portion 1211 at this location is weaker than that of the portion of the bent portion 1211 excluding the fold line 101. Setting the thickness of the first coating 1221 at the fold line 101 of the bent portion 1211 to the maximum can supplement / enhance the structural strength of the bent portion 1211 at this location, i.e., the fold line 101, thereby making the overall structural strength of the bent portion 1211 more balanced / uniform and maintaining the stability of the substrate 1210.

[0069] Please see Figure 10 , Figure 10This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in some embodiments of this application.

[0070] Unlike the embodiments described above, the first coating 1221 in this embodiment may include at least two stacked sub-coatings 12211. The material, thickness, and elastic modulus of each sub-coating 12211 may differ. Researchers can freely select the desired sub-coatings 12211 according to actual conditions.

[0071] The first coating 1221, which is formed by stacking sub-coatings 12211, not only has certain impact resistance and buffering energy absorption properties, but also requires that each time an external force is transmitted to a new sub-coating 12211, it needs to be divided and absorbed by the surface of the corresponding sub-coating 12211. This allows the bending part 1211 to have better impact resistance and buffering energy absorption properties, and enables the force transmitted to the flexible screen 110 to gradually decrease, thus providing better protection for the flexible screen 110.

[0072] In this application, the second surface 12112 of the bent portion 1211 is a first arcuate surface 121120 bent towards the first surface 12111. The first arcuate surface 121120 allows the bent portion 1211 to be thinner, thereby giving the bent portion 1211 better bending performance. The protective layer 1220 covering one side of the second surface 12112 not only improves the impact resistance of the bent portion 1211 of the substrate 1210, but also disperses and absorbs the impact force, thereby improving the structural strength of the bent portion 1211 of the substrate 1210. As a result, the bent portion 1211 of the substrate 1210 not only has good bending performance, but also strong structural strength.

[0073] Furthermore, since the thickness of the substrate 1210 is generally between 20-100 μm, the distance between the first surface 12111 and the second surface 12112 at the fold line 101 of the bending portion 1211 is 50%-80% of the thickness of the substrate 1210, and the distance between the boundary line of the second surface 12112 and the flat portion 1212 is 0.5-2 mm, it can be seen that the groove width formed by the second surface 12112 is much larger than its groove depth, the span between the two ends of the arc of the groove cross-section is large, and the curvature of the arc is large. This makes the arch bridge surface formed by the groove disperse the impact force applied from the first surface 12111 to the second surface 12112 more smoothly and evenly, so that when the substrate 1210 bends at its bending portion 1211, there will be no large stress concentration point at the bending portion 1211, reducing the possibility of the bending portion 1211 of the substrate 1210 breaking.

[0074] Please continue reading. Figure 5This application also provides a foldable screen assembly 10, which may include a flexible screen 110 and a cover plate 120. The flexible screen 110 is mainly used for displaying images and can also serve as an interactive interface. The flexible screen 110 can be a flexible display device such as OLED (Organic Light-Emitting Diode) to realize the image display function of electronic devices. The flexible screen 110 may include a display surface 111 and a non-display surface 112, wherein the display surface 111 is the side surface of the flexible screen 110 that can display images and perform interactions, and the non-display surface 112 is the side surface of the flexible screen 110 that faces away from the display surface 111.

[0075] The cover plate 120 is disposed on one side of the display surface 111 of the flexible screen 110. The cover plate 120 can prevent external debris from scratching the display surface 111 of the flexible screen 110, so as to improve the service life and display effect of the flexible screen 110. The cover plate 120 can be the cover plate 120 in the aforementioned embodiment.

[0076] like Figure 9 As shown, the second surface 12112 is located between the display surface 111 of the flexible screen 110 and the first surface 12111. At this time, the protective layer 1220 includes a first coating layer 1221 and a second coating layer 1222 stacked together. The first coating layer 1221 is located between the second surface 12112 and the second coating layer 1222, and the elastic modulus of the first coating layer 1221 is greater than that of the second coating layer 1222. The side of the first coating layer 1221 facing away from the second surface 12112 is a second arc-shaped surface 12211, and the bending direction of the second arc-shaped surface 12211 is the same as the bending direction of the first arc-shaped surface 121120.

[0077] In this embodiment, both the first coating 1221 and the second coating 1222 are located within the groove formed by the second surface 12112. The first coating 1221 covers the second surface 12112 in an arched structure. The second coating 1222 covers the side of the first coating 1221 facing away from the second surface 1222 and fills the groove formed by the second surface 12112. The second coating 1222 can form an approximate arched structure on the side of the first coating 1221 facing away from the second surface 12112 to flatten the second surface 12112, so that the surface of the substrate 1210 facing away from the first surface 12111 forms a surface parallel to the first surface 12111, so that the side of the substrate 1210 away from its first surface 12111 can be completely bonded to the display surface 111 of the flexible screen 110.

[0078] The arch-shaped structure formed by the first coating 1221 can disperse and weaken the force applied to the first surface 12111 of the bending portion 1211, thereby reducing the impact of external forces on the bending portion 1211 and improving the impact resistance of the first surface 12111 side of the bending portion 1211. In addition, both the first coating 1221 and the second coating 1222 can buffer and absorb the forces transmitted to their surfaces, further weakening the impact of external forces on the bending portion 1211 and reducing the possibility of the bending portion 1211 breaking due to external forces.

[0079] Please see Figure 11 , Figure 11 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in some embodiments of this application.

[0080] Unlike the above embodiments, in this embodiment, the first coating 1221 is completely located in the groove formed by the second surface 12112, and in the direction perpendicular to the fold line 101 of the bending portion 1211, the two ends of the second coating 1222 away from the fold line 101 of the bending portion 1211 extend from the corresponding side ends of the second surface 12112 connected to the flattening portion 1212, and extend to the corresponding side of the substrate 1210.

[0081] In this embodiment, a second coating 1222 extending from a groove formed in the second surface 12112 is sandwiched between the substrate 1210 and the display surface 111 of the flexible screen 110, and is attached to the corresponding substrate 1210 or display surface 111. An arch-shaped structure is formed at the position where the first coating 1221 contacts the second surface 12112, and the arch-shaped structure can improve the structural strength of the bent portion 1211. The second coating 1222 covers the side of the first coating 1221 away from the second surface 12112, and the second coating 1222 can form a structure similar to an arched bridge opening and flatten the arch-shaped structure formed by the first coating 1221.

[0082] Specifically, the arch-shaped structure formed by the first coating 1221 can disperse and weaken the force transmitted to the first surface 12111 of the bending portion 1211, thereby reducing the impact of external forces on the bending portion 1211 and improving the impact resistance of the first surface 12111 side of the bending portion 1211. Moreover, both the first coating 1221 and the second coating 1222 can buffer and absorb the force transmitted to their surfaces, further weakening the impact of external forces on the bending portion 1211 and reducing the possibility of the bending portion 1211 breaking due to external forces.

[0083] Please see Figure 12 , Figure 12This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in some embodiments of this application. In the figure, both the first coating 1221 and the second coating 1222 extend into grooves formed by the second surface 12112.

[0084] Unlike the above embodiments, in this embodiment, the side end of the first coating 1221 extends from the boundary line between the flat portion 1212 and the bent portion 1211, forming the bent portion 1211. The first coating 1221 extending from the bent portion 1211 is tightly adhered to the surface of the adjacent flat portion 1212. The second coating 1222 covers the surface of the first coating 1221 facing away from the substrate 1210, and the surface of the second coating 1222 facing away from the first coating 1221 is parallel to the surface of the flat portion 1212 facing away from the first surface 12111. The first coating 1221 and the second coating 1222 can improve the impact resistance of the bent portion 1211 and can buffer and absorb the impact force, thereby improving the structural strength of the bent portion 1211. Furthermore, the second coating 1222 can flatten the side of the first coating 1221 facing away from the second surface 12112, making it easier for the substrate 1210 to adhere to the display surface 111 of the flexible screen 110.

[0085] Please see Figure 10 Unlike the above embodiments, in this embodiment, the elastic modulus of the first coating 1221 is greater than that of the second coating 1222. The first coating 1221 includes at least two stacked sub-coatings 12211. Specifically, the elastic modulus of the sub-coating 12211 directly disposed on the second surface 12112 is greater than that of the sub-coating 122111 located away from the second surface 12112. That is, the elastic modulus of the sub-coating 122111 directly bonded to the second surface 12112 is greater than that of any other sub-coating 122111.

[0086] Specifically, in this embodiment, the sub-coating 12211 that directly contacts the inner wall of the groove has the largest elastic modulus among all sub-coatings 12211, thus possessing stronger impact resistance. When the bent portion 1211 of the substrate 1210 is subjected to force, the sub-coating 12211 with the largest elastic modulus forms an arch-shaped structure to resist external impact, and the resisted external force can be gradually dispersed along the arch-shaped structure to the end of the arch-shaped structure under the action of the arch-shaped structure. During the dispersion of external force, the other sub-coatings 12211 with smaller elastic moduli can buffer and absorb the dispersed impact force, thereby enabling the substrate 1210 to have stronger impact resistance and the bent portion 1211 of the substrate 1210 to have stronger structural strength.

[0087] Furthermore, in this embodiment, the buffer coating, composed of at least two sub-coatings 12211, allows for more diverse structural combinations. The stacked sub-coatings 12211 can be two, three, four, or five layers, etc. Researchers can freely change the composition of the buffer coating according to their research and development needs to adapt to the development of different electronic devices, foldable screen components, and cover plates.

[0088] In some embodiments, the second surface 12112 is located on the side of the first surface 12111 that faces away from the display surface 111. The protective layer 1220 includes a first coating layer 1221 and a second coating layer 1222 stacked together, the first coating layer 1221 being located between the second surface 12112 and the second coating layer 1222, and the elastic modulus of the first coating layer 1221 being less than the elastic modulus of the second coating layer 1222. The surface of the first coating layer 1221 facing away from the second surface 12112 is a second arcuate surface 12211, and the bending direction of the second arcuate surface 12211 is opposite to the bending direction of the first arcuate surface 121120.

[0089] Please see Figure 13 , Figure 13 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in some other embodiments of this application. In this embodiment, the first surface 12111 of the bent portion 1211 directly covers the display surface 111 of the flexible screen 110, and the first coating 1221 and the second coating 1222 are both located in the groove formed by the second surface 12112. The first coating 1221 covers the second surface 12112, and its side away from the flexible screen 110 is arranged in an arched bridge shape in the groove. The second coating 1222 covers the surface of the first coating 1221 facing away from the second surface 12112, that is, the second coating 1222 spans across the opposite ends of the second surface 12112 to form an arched bridge structure. The side of the second coating 1222 facing away from the flexible screen 110 is flush with the side of the substrate 1210 facing away from the flexible screen 110, which can achieve the planarization of the second surface 12112.

[0090] In this embodiment, both the second coating 1222 and the first coating 1221 can buffer and absorb the received force, thereby weakening the impact of external force on the bending portion 1211. When an external force is transmitted from one side of the cover plate 120 to one side of the flexible screen 110, the second coating 1222 and the first coating 1221 can ensure the structural strength of the bending portion 1211. When an external force is transmitted from one side of the flexible screen 110 to one side of the cover plate 120, the arch-shaped structure formed by the first coating 1221 can disperse and weaken the external force, thereby reducing the impact of the external force on the bending portion 1211, improving the impact resistance of the first surface 12111 side of the bending portion 1211, and ensuring the structural strength of the bending portion 1211. In addition, the side of the second coating 1222 away from the flexible screen 110 can flatten the groove area of ​​the groove formed by the second surface 12112, so that in this embodiment, the surface of the flattened portion 1212 of the substrate 1210 away from the flexible screen 110 and the surface of the second coating 1222 away from the flexible screen 110 are connected more smoothly.

[0091] Please see Figure 14 , Figure 14 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in other embodiments of this application.

[0092] Unlike the above embodiments, in this embodiment, the first coating 1221 covers the second surface 12112 and can completely fill the groove formed by the second surface 12112.

[0093] Specifically, the first coating 1221 extends from the side of the second surface 12112 away from the second surface, i.e., the second arc-shaped surface 12211 protrudes from the groove opening in an arched manner. In a direction perpendicular to the fold line 101 of the bent portion 1211, the first coating 1221 can extend to the two boundary lines of the bent portion 1211 and the flat portion 1212, and is flush with the side surface of the flat portion 1212 that is away from the flexible screen 110.

[0094] Furthermore, the second coating 1222 covers the side of the first coating 1221 facing away from the first surface 12111. In a direction perpendicular to the fold line 101 of the bend 1211, the two ends of the second coating 1222, away from the fold line 101 of the bend 1211, extend to the corresponding side ends of the substrate 1210. The portion of the second coating 1222 extending to the side end of the substrate 1210 is directly in contact with the substrate 1210, while the surface of the second coating 1222 away from the substrate 1210 is parallel to the substrate 1210.

[0095] In this embodiment, both the first coating 1221 and the second coating 1222 are located on the side of the substrate 1210 away from the flexible screen 110. When an external force is transmitted from the bending portion 1211 of the substrate 1210 to the flexible screen 110, the structure on the bending portion 1211 that is first subjected to force is the second coating 1222. Since the first coating 1221 protrudes from the second surface 12112, the side of the second coating 1222 that contacts the first coating 1221 has an arch-shaped structure. Due to the influence of the arch-shaped structure, part of the pressure acting directly on the second coating 1222 will be converted into horizontal stress and will gradually disperse along the arch shape, thereby improving the impact resistance of the second coating 1222 and thus improving the impact resistance of the bending portion 1211 of the substrate 1210.

[0096] When an external force is transmitted from one side of the flexible screen 110 to the bending portion 1211, the first surface 12111 of the bending portion 1211 is subjected to the force first, and then the force is transmitted to the first coating 1221 via the second surface 12112. Since the side of the first coating 1221 covering the second surface 12112 is an arched surface, when the external force is transmitted to the arched surface, it will be dispersed and weakened on the first coating 1221, thereby enabling the bending portion 1211 to have stronger impact resistance.

[0097] Furthermore, both the first coating 1221 and the second coating 1222 described above can buffer and absorb the impact force transmitted to their respective coating bodies, thereby further improving the impact resistance of the bending portion 1211.

[0098] Please see Figure 15 , Figure 15 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in other embodiments of this application.

[0099] Unlike the above embodiments, in this embodiment, the first coating 1221 fills the groove formed by the second surface 12112, and the side of the first coating 1221 away from the second surface 12112 protrudes from the second surface 12112 in an arch shape. Furthermore, in a direction perpendicular to the fold line 101 of the bend 1211, the first coating 1221 extends beyond the groove formed by the second surface 12112 and extends to the surface of the corresponding flattened portion 1212, with the surfaces of the first coating 1221 and the flattened portion 1212 respectively adhering to each other. The second coating 1222 covers the side of the buffer coating away from the substrate 1210, and the surface of the second coating 1222 away from the first coating 1221 is parallel to the flattened portion 1212 of the substrate 1210.

[0100] Specifically, the first coating 1221 can form an arched structure protruding from the second surface 12112, which can disperse and reduce the external force transmitted from the second coating 1222 to the first coating 1221, thereby improving the impact resistance of the bent portion 1211 of the substrate 1210. Simultaneously, the first coating 1221 and the second coating 1222 can buffer and absorb the external force transmitted to their respective coatings, further reducing the impact of external forces on the bent portion 1211 and ensuring the structural strength of the bent portion 1211. Furthermore, the first coating 1221 directly covers the surface of the substrate 1210 and adheres more tightly to the surface of the substrate 1210, helping to ensure the integrity of the substrate 1210.

[0101] Please see Figure 16 , Figure 16 This is a partial cross-sectional structural diagram of the foldable screen assembly 20 in other embodiments of this application.

[0102] Unlike the above embodiments, in this embodiment, the first coating 1221 includes at least two stacked sub-coatings 12211, wherein the elastic modulus of the sub-coating 12211 disposed on the second surface 12112 is less than the elastic modulus of the sub-coating 12211 disposed away from the second surface 12112, that is, the elastic modulus of the sub-coating 12211 that is in direct contact with and adheres to the second surface 12112 is less than the elastic modulus of any other sub-coating 12211. Furthermore, the elastic modulus of the second coating 1222 is greater than the elastic modulus of any one of the sub-coatings 12211 in the first coating 1221.

[0103] Specifically, when an external force is transmitted from the bending portion 1211 of the substrate 1210 to the flexible screen 110, the second coating 1222 is the first part of the bending portion 1211 to come into contact with the external force. The second coating 1222 can buffer and absorb the external force, thereby reducing the force transmitted to the first coating 1221. Moreover, the first coating 1221, composed of various sub-coatings 12211, can protrude from the groove formed by the second surface 12112, so that the surface where the second coating 1222 and the first coating 1221 contact and adhere to each other is an arched bridge surface facing away from the second surface 12112. This allows the force transmitted to the first coating 1221 to be dispersed and reduced by the arched bridge surface, thereby reducing the impact of the external force on the bending portion 1211. In addition, the first coating 1221 can also buffer and absorb the force transmitted to the first coating 1221, which can further reduce the impact of external force on the bending portion 1211, thereby ensuring the structural strength of the bending portion 1211 of the substrate 1210.

[0104] In this embodiment, the first coating 1221 is formed by the superposition of at least two sub-coatings 12211, which allows for more different combinations of the structure of the first coating 1221. Researchers can freely change the composition and combination of the first coating 1221 according to research and development needs to adapt to the development of foldable screen components 10 for different foldable screen phones.

[0105] like Figure 1-3 As shown, this application also provides an electronic device 100, which may include a foldable screen assembly 10, a mid-frame 20, and a housing 30. The foldable screen assembly 10 and the housing 30 are respectively connected to opposite sides of the mid-frame 20; wherein, the foldable screen assembly 10 may be the foldable screen assembly 10 in the aforementioned embodiments. The electronic device 100 provided with the above-mentioned foldable screen assembly 10 has a cover plate 120 with not only good bending performance, but also strong impact resistance and buffer energy absorption performance in its bending area.

[0106] Please see Figure 17 , Figure 17 This is a schematic block diagram of the structure of an electronic device 100 in some embodiments of this application. The electronic device can be a mobile electronic device, which may include: a memory 901, a processor (Central Processing Unit, CPU) 902, a circuit board (not shown), a power supply circuit, and a microphone 913. The circuit board is housed within the space enclosed by a housing; the CPU 902 and the memory 901 are mounted on the circuit board; the power supply circuit supplies power to the various circuits or devices of the electronic device; the memory 901 stores executable program code; the CPU 902 reads the executable program code stored in the memory 901 to run a computer program corresponding to the executable program code, thereby recognizing the aforementioned identification information to achieve unlocking and wake-up functions.

[0107] The electronic device may also include: a peripheral interface 903, an RF (Radio Frequency) circuit 905, an audio circuit 906, a speaker 911, a power management chip 908, other input / output (I / O) subsystem input / control devices, a touch screen 912 (which may be the flexible screen 110 in the foregoing embodiments), other input / control devices 910, and an external port 904. These components communicate through one or more communication buses or signal lines 907.

[0108] The memory 901 can be accessed by the CPU 902, peripheral interface 903, etc. The memory 901 may include high-speed random access memory, and may also include non-volatile memory, such as one or more disk storage devices, flash memory devices, or other volatile solid-state storage devices. The peripheral interface 903 can connect the device's input and output peripherals to the CPU 902 and the memory 901.

[0109] The I / O subsystem 909 can connect input / output peripherals on the device, such as the touchscreen 912 and other input / control devices 910, to the peripheral interface 903. The I / O subsystem 909 may include a display controller 9091 and one or more input controllers 9092 for controlling other input / control devices 910. The one or more input controllers 9092 receive or send electrical signals to other input / control devices 910, which may include physical buttons (press buttons, rocker buttons, etc.), dial pads, slide switches, joysticks, and click wheels. It is worth noting that the input controllers 9092 can be connected to any of the following: a keyboard, an infrared port, a USB interface, and a pointing device such as a mouse.

[0110] The touchscreen 912 is an input and output interface between the user's electronic device and the user, displaying visual output to the user. The visual output can include graphics, text, icons, videos, etc.

[0111] The display controller 9091 in the I / O subsystem 909 receives or sends electrical signals to the touchscreen 912. The touchscreen 912 detects touches on the touchscreen, and the display controller 9091 converts the detected touches into interactions with user interface objects displayed on the touchscreen 912, thus realizing human-computer interaction. The user interface objects displayed on the touchscreen 912 can be icons for running games, icons for connecting to a corresponding network, etc.

[0112] The RF circuit 905 is primarily used to establish communication between the mobile phone and the wireless network (i.e., the network side), enabling the mobile phone to receive and send data with the wireless network. Examples include sending and receiving SMS messages and emails. Specifically, the RF circuit 905 receives and transmits RF signals, also known as electromagnetic signals. The RF circuit 905 converts electrical signals into electromagnetic signals or vice versa, and uses these electromagnetic signals to communicate with the communication network and other devices. The RF circuit 905 may include known circuits for performing these functions, including but not limited to antenna systems, RF transceivers, one or more amplifiers, tuners, one or more oscillators, digital signal processors, CODEC (Coder-Decoder) chipsets, Subscriber Identity Modules (SIMs), etc.

[0113] The audio circuit 906 is mainly used to receive audio data from the peripheral interface 903, convert the audio data into electrical signals, and send the electrical signals to the speaker 911. The speaker 911 is used to convert the voice signals received by the mobile phone from the wireless network via the RF circuit 905 back into sound and play the sound to the user. The power management chip 908 is used to provide power and manage the power supply for the CPU 902, the I / O subsystem, and the hardware connected to the peripheral interface.

[0114] The cover plate, foldable screen assembly, and electronic device provided in this application embodiment, by providing a protective layer on the second surface of the bent portion of the substrate, and the second surface being an arc-shaped surface bent towards the first surface, can enhance the substrate's impact resistance while maintaining its bending performance. Simultaneously, the elastic modulus of the protective layer is lower than that of the substrate, giving it a stronger buffering and energy absorption capacity, further improving the structural strength of the bent portion, reducing the possibility of breakage or shattering of the cover plate during bending, and ensuring the integrity of the cover plate.

[0115] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to those processes, methods, products, or setups.

[0116] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A cover plate applied to a folding screen assembly, characterized in that, The cover plate includes: A substrate, the substrate including a bent portion and flat portions disposed on opposite sides of the bent portion; the bent portion is capable of bending along a fold line, the bent portion including a first surface and a second surface disposed opposite to each other, the second surface being a first arc-shaped surface, and bending from the junction of the bent portion and the flat portion toward a direction close to the first surface to form an arc-shaped groove, the width of the arc-shaped groove being greater than the depth of the groove; wherein, the distance between the first surface and the second surface gradually increases in the direction of the fold line toward the junction of the bent portion and the flat portion; and A protective layer is provided covering the second surface; wherein the elastic modulus of the protective layer is less than the elastic modulus of the substrate. The protective layer comprises a first coating and a second coating stacked together, wherein the first coating is located between the second surface and the second coating; The cover plate is used to cover the flexible screen of the foldable screen assembly; wherein, when the second surface is located between the flexible screen and the first surface, the elastic modulus of the first coating is greater than that of the second coating, the side of the first coating facing away from the second surface is a second arc-shaped surface, and the bending direction of the second arc-shaped surface is the same as that of the first arc-shaped surface; when the second surface is located on the side of the first surface facing away from the flexible screen, the elastic modulus of the first coating is less than that of the second coating, the side of the first coating facing away from the second surface is a second arc-shaped surface, and the bending direction of the second arc-shaped surface is opposite to that of the first arc-shaped surface; The thickness of the first coating gradually decreases in the direction of the fold line toward the junction of the bent portion and the flat portion.

2. The cover sheet of claim 1, wherein The protective layer extends from the second surface to the side surface of the flattened portion that is in contact with the second surface.

3. The cover plate according to claim 1, characterized in that, The protective layer is parallel to the first surface on the side opposite to the second surface.

4. The cover plate according to claim 1, characterized in that, The elastic modulus of the protective layer is 20. 8000 MPa.

5. The cover plate according to claim 1, characterized in that, The second coating covers the side of the first coating that is away from the second surface and extends to the side of the flattened portion that is in contact with the second surface.

6. The cover plate according to claim 1, characterized in that, The first coating covers the second surface and extends to the side surface of the flattened portion that is in contact with the second surface.

7. The cover plate according to claim 1, characterized in that, The first coating comprises at least two sub-coatings stacked together.

8. A foldable screen component, characterized in that, It includes a flexible screen and a cover plate, wherein the flexible screen includes a display surface and a non-display surface, and the cover plate is disposed on the display surface of the flexible screen; Wherein, the cover plate is as described in claim 1 7. The cover plate described in any one of the following.

9. The foldable screen assembly according to claim 8, characterized in that, The second surface is located between the display surface and the first surface, and the elastic modulus of the first coating is greater than that of the second coating.

10. The foldable screen assembly according to claim 9, characterized in that, The first coating comprises at least two stacked sub-coatings; the elastic modulus of the sub-coatings disposed on the second surface is greater than the elastic modulus of the sub-coatings disposed away from the second surface.

11. The foldable screen assembly according to claim 8, characterized in that, The second surface is located on the side of the first surface away from the display surface, and the elastic modulus of the first coating is less than that of the second coating.

12. The foldable screen assembly according to claim 11, characterized in that, The first coating comprises at least two stacked sub-coatings; the elastic modulus of the sub-coatings disposed on the second surface is less than the elastic modulus of the sub-coatings disposed away from the second surface.

13. An electronic device, characterized in that, It includes a foldable screen assembly, a mid-frame, and a housing, wherein the foldable screen assembly and the housing are respectively connected to opposite sides of the mid-frame; The foldable screen component is as described in claim 8. The foldable screen assembly described in any one of the 12 claims.

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