Foldable electronic device, flexible display assembly, and support plate

Abstract

The application provides a foldable electronic device, a flexible display screen assembly and a support plate; the support plate comprises a first plate body, a second plate body and a third plate body; the second plate body and the third plate body are connected with the first plate body respectively, and the first plate body, the second plate body and the third plate body jointly constitute a support plane; wherein at least part of the structure of the first plate body is located in the middle part of the support plane; the density of the second plate body and the third plate body is less than that of the first plate body. The support plate for supporting the flexible display screen provided by the application adopts a structure form of splicing plate bodies made of different materials, which can guarantee the bending reliability of the middle bending area on one hand, and can reduce the weight of the support plate on the other hand, so that the electronic device using the support plate can reduce the weight and improve the user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foldable electronic devices, in particular to a foldable electronic device, a flexible display assembly and a support plate. BACKGROUND

[0002] The competition in the mobile terminal industry such as mobile phones and tablet computers is increasingly tending to large screens and ultra-thin, but large screens bring the problem of too large overall size and inconvenience to carry, and screen folding can solve this problem. Therefore, folding terminals may become the mainstream trend in the future, and more and more folding screen mobile phones have been launched in the market recently, but due to the development limitations of folding screen related materials and processes, folding screen related failure problems are still showing a high incidence, especially in the problem of supporting the flexible display screen. SUMMARY

[0003] The first aspect of the present application provides a support plate for supporting a flexible display screen, which comprises a first plate body, a second plate body and a third plate body;

[0004] The second plate body and the third plate body are respectively connected with the first plate body, and the first plate body, the second plate body and the third plate body jointly constitute a support plane.

[0005] Among them, at least part of the structure of the first plate body is located in the middle of the support plane; the density of the second plate body and the third plate body is less than that of the first plate body.

[0006] The second aspect, the present application provides a flexible display screen assembly, which comprises a flexible display module and the support plate of any one of the above embodiments, and the flexible display module is arranged on the support plane of the support plate.

[0007] In addition, the present application further provides a foldable electronic device, which comprises a shell, a control circuit board and the flexible display screen assembly of the above embodiments; the shell and the display screen assembly cooperate to form a containing space, and the control circuit board is arranged in the containing space and electrically connected with the flexible display module of the flexible display screen assembly.

[0008] The support plate for supporting a flexible display screen provided by the present application adopts a structure form of splicing plate bodies made of different materials, which can not only ensure the bending reliability of the middle bending area, but also reduce the weight of the support plate, so that the electronic device using the support plate can reduce the weight and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0010] Figure 1 is a schematic diagram of the overall structure of an embodiment of the support plate for supporting a flexible display screen of the present application;

[0011] Figure 2 is Figure 1 is a schematic diagram of the structure of the support plate at A-A in the embodiment;

[0012] Figure 3 is Figure 2 is a schematic diagram of the structure of the support plate in the embodiment;

[0013] Figure 4 is a schematic diagram of the structure of another embodiment of the support plate of the present application;

[0014] Figure 5 is a schematic diagram of the overall structure of still another embodiment of the support plate of the present application;

[0015] Figure 6 is Figure 5 is a schematic diagram of the structure of the support plate at B-B in the embodiment;

[0016] Figure 7 is a schematic diagram of the overall structure of still another embodiment of the support plate of the present application;

[0017] Figure 8 is Figure 7 is a schematic diagram of the structure of the support plate at C-C in the embodiment;

[0018] Figure 9 is a schematic diagram of the structure of still another embodiment of the support plate of the present application;

[0019] Figure 10 is a schematic diagram of the structure of still another embodiment of the support plate of the present application;

[0020] Figure 11 is a schematic diagram of the structure of an embodiment of the flexible display screen assembly of the present application;

[0021] Figure 12 is a schematic diagram of the folded state of an embodiment of the foldable electronic device of the present application;

[0022] Figure 13 is Figure 12 is a schematic diagram of the unfolded state of the electronic device in the embodiment;

[0023] Figure 14 is Figure 13 a partial structural exploded view of an electronic device;

[0024] Figure 15 is Figure 13 a cross-sectional view of the electronic device at D-D. DETAILED DESCRIPTION

[0025] The application will be further described below with reference to the drawings and embodiments. It is expressly noted that the following embodiments are merely meant to illustrate the application, but do not limit the scope of the application. Similarly, the following embodiments are only some of the embodiments of the application, and all other embodiments obtained by those skilled in the art without making creative efforts, fall within the scope of the application.

[0026] Reference herein to "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments. It is explicitly noted, however, that described embodiments can be combined with other embodiments.

[0027] As used herein, "electronic device" (or simply "terminal") includes, but is not limited to, a device configured to receive / send communication signals over a wired line (e.g., over a public switched telephone network (PSTN), Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and / or another data connection / network) and / or over a wireless interface (e.g., for a cellular network, a wireless local area network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and / or another communication terminal). A communication terminal configured to communicate over a wireless interface can be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine a cellular radiotelephone with data processing, facsimile, and data communications capabilities; PDA's that can include a wireless radio telephone, a pager, Internet / intranet access, Web browser, organizer, calendar, and / or a global positioning system (GPS) receiver; and conventional laptop and / or palmtop receivers or other electronic devices that include a wireless radio telephone transceiver. A handset is an electronic device configured with a cellular communication module.

[0028] The existing foldable flexible screen module needs large steel sheets for support. The thickness of the steel sheets is generally 0.10-0.15 mm. Most of the current foldable screen mobile phones adopt this design scheme, and the support steel sheet under the screen often accounts for 15-20 g of weight because the density of stainless steel is relatively high. Therefore, thinning and lightening is a major trend in the future.

[0029] Therefore, the embodiments of the present application provide a support plate structure for flexible display screen support. Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the overall structure of an embodiment of the support plate for flexible display screen support of the present application, Figure 2 is Figure 1 the structure of the support plate at A-A in the embodiment. The support plate in the present application is mainly used for the support of the flexible display screen of foldable electronic devices. The electronic devices can include mobile phones, tablet computers, notebook computers, wearable devices, and other electronic devices with foldable flexible display screens. The support plate 10 includes but is not limited to a first plate body 100, a second plate body 200, and a third plate body 300. It should be noted that the terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. 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 can optionally include steps or units that are not listed, or can optionally include other steps or components inherent to the process, method, product or device.

[0030] Specifically, the second plate body 200 and the third plate body 300 are connected with the first plate body 100 respectively, and the first plate body 100, the second plate body 200 and the third plate body 300 jointly constitute a support plane 1000, that is, the upper surface of the support plate 10 in the figure; wherein at least part of the structure of the first plate body 100 is located in the middle of the support plane 1000; the second plate body 200 and the third plate body 300 are located on both sides respectively; the material density of the second plate body 200 and the third plate body 300 is less than the material density of the first plate body 100.

[0031] Optionally, the first plate body 100 has a greater elongation at break than the second plate body 200 and the third plate body 300. The first plate body 100 is made of stainless steel or titanium alloy; the second plate body 200 and the third plate body 300 are made of carbon fiber or titanium alloy, wherein the material of the second plate body 200 and the third plate body 300 can be different from that of the first plate body 100, for example, the second plate body 200 and the third plate body 300 are made of carbon fiber, and the first plate body 100 is made of stainless steel, titanium alloy or aluminum alloy; when the second plate body 200 and the third plate body 300 are made of titanium alloy or aluminum alloy, the first plate body 100 is made of stainless steel. It should be noted that the terms "first", "second", "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0032] Wherein, the density of titanium alloy is generally about 4.5, the density of stainless steel is about 7.8, and the density of carbon fiber is about 1.7; the elastic modulus of titanium alloy is about 110 Gpa, the elastic modulus of stainless steel is about 200 Gpa, and the elastic modulus of carbon fiber is between 140-230 Gpa (according to different grades). The bending property of carbon fiber itself is very poor. The elongation at break of stainless steel sheet is generally more than 10%, and the elongation at break of titanium alloy is at least more than 5%, while the elongation at break of carbon fiber sheet is less than 2%, so it is relatively brittle and not conducive to bending. The technical scheme in the embodiment combines the characteristics of the two, uses the small density of carbon fiber sheet as a plane support area to reduce weight, and uses the large elongation at break of stainless steel sheet as a bending area material.

[0033] Optionally, please refer to Figure 3 , Figure 3 is Figure 2Optionally, the support plane 1000 comprises at least a first support area 1100, a second support area 1200 and a third support area 1300; the support surface of the first plate body 100 (i.e. the upper surface of the first plate body 100 in the figure) forms the first support area 1100; the support surface of the second plate body 200 (i.e. the upper surface in the figure) is located in the second support area 1200, and the support surface of the third plate body 300 (i.e. the upper surface of the second plate body 200 in the figure) is located in the third support area 1300; wherein the second support area 1200 and the third support area 1300 are respectively located on the opposite sides of the first support area 1100. The first support area 1100 is a bending area, i.e. used to support the bending area of the middle part of the flexible display screen module, while the second support area 1200 and the third support area 1300 are used as plane support areas to support the plane area of the flexible display screen module.

[0034] Please continue to refer to Figure 3 In the embodiment, the first plate body 100 is provided with a first accommodating groove 110 corresponding to the second support area 1200; the second plate body 200 is embedded in the first accommodating groove 110 and fixedly connected with the first plate body 100; wherein the fixed connection between the second plate body 200 and the first plate body 100 can be adhesive bonding by using epoxy resin / polyacrylate glue with a thickness of 0.02 mm. Alternatively, after the second plate body 200 is embedded in the first accommodating groove 110 of the first plate body 100, the hot-pressing mold is used to form an integrated hot-pressing. The detailed structure and characteristics of this part are within the understanding range of those skilled in the art, and will not be described here.

[0035] Optionally, the first plate body 100 is provided with a second accommodating groove 120 corresponding to the third support area 1300; the third plate body 300 is embedded in the second accommodating groove 120 and fixedly connected with the first plate body 100. Similarly, the fixed connection between the third plate body 300 and the first plate body 100 can be adhesive bonding by using epoxy resin / polyacrylate glue with a thickness of 0.02 mm. Alternatively, after the third plate body 300 is embedded in the second accommodating groove 120 of the first plate body 100, the hot-pressing mold is used to form an integrated hot-pressing.

[0036] The first plate body 100 (for example, a stainless steel sheet) provides a flat surface for supporting the flexible display screen, and the second plate body 200 and the third plate body 300 (for example, carbon fiber sheets) are spliced as weight-reducing reinforcing materials. The thickness of the carbon fiber sheet can be 0.10 mm, the thickness of the stainless steel / titanium alloy / aluminum alloy large surface (i.e., the first plate body 100) can be 0.15 mm, and the thickness of the spliced part of the carbon fiber sheet is 0.05 mm. It should be noted that in the technical solution of using epoxy resin / polyacrylate glue for bonding, the thickness of the first plate body 100 can remain unchanged, the thickness of the glue is 0.02 mm, and the thickness of the carbon fiber sheet (i.e., the second plate body 200 and the third plate body 300) can be 0.08 mm.

[0037] The support plate for supporting the flexible display screen provided by the embodiments of the present application adopts the structure of splicing plate bodies made of different materials, which can ensure the bending reliability of the middle bending area and reduce the weight of the support plate, thereby reducing the weight of the electronic device using the support plate and improving the user experience.

[0038] Please refer to Figure 4 , Figure 4 is a structural cross-sectional view of another embodiment of the support plate of the present application. The support plate 10 in this embodiment also includes a first plate body 100, a second plate body 200, and a third plate body 300. The second plate body 200 and the third plate body 300 are connected to the first plate body 100, and the first plate body 100, the second plate body 200, and the third plate body 300 together form a support plane 1000, i.e., the upper surface of the support plate 10 in the figure. The second plate body 200 and the third plate body 300 are located on both sides, respectively. The material density of the second plate body 200 and the third plate body 300 is less than that of the first plate body 100.

[0039] Alternatively, the elongation at break of the first plate body 100 is greater than that of the second plate body 200 and the third plate body 300. The material of the first plate body 100 is selected from stainless steel or titanium alloy; the materials of the second plate body 200 and the third plate body 300 are selected from carbon fiber or titanium alloy, wherein the materials of the second plate body 200 and the third plate body 300 can be different from that of the first plate body 100, for example, the materials of the second plate body 200 and the third plate body 300 are carbon fiber, and the material of the first plate body 100 can be stainless steel, titanium alloy, or aluminum alloy; when the materials of the second plate body 200 and the third plate body 300 are titanium alloy or aluminum alloy, the material of the first plate body 100 can be stainless steel.

[0040] Optionally, the support plane 1000 comprises a first support area 1100, a second support area 1200 and a third support area 1300; the support surface of the first plate body 100 (i.e. the upper surface of the first plate body 100 in the figure) forms the first support area 1100; the support surface of the second plate body 200 (i.e. the upper surface in the figure) is located in the second support area 1200, and the support surface of the third plate body 300 (i.e. the upper surface of the second plate body 200 in the figure) is located in the third support area 1300; wherein the second support area 1200 and the third support area 1300 are respectively located on the opposite sides of the first support area 1100. Among them, the first support area 1100 is a bending area, that is, it is used to support the bending area of the middle part of the flexible display screen module, and the second support area 1200 and the third support area 1300 are used as plane support areas to support the plane area of the flexible display screen module.

[0041] Different from the foregoing embodiments, the first plate body 100 in this embodiment is provided with a hollow pattern 101 corresponding to the area of the first support area 1100. The hollow pattern 101 serves to reduce the bending strength of the first plate body 100 at the position corresponding to the first support area 1100 and enhance the bendability of the first plate body 100 at the position corresponding to the first support area 1100. In this way, the service life of the first plate body 100 is improved.

[0042] Please refer to Figure 5 and Figure 6 , Figure 5 is a schematic view of the overall structure of another embodiment of the support plate of the present application, Figure 6 is Figure 5 a schematic view of the structure of the support plate at B-B in the embodiment; the support plate 10 in this embodiment also comprises a first plate body 100, a second plate body 200 and a third plate body 300. The second plate body 200 and the third plate body 300 are respectively connected with the first plate body 100, and the first plate body 100, the second plate body 200 and the third plate body 300 together constitute a support plane 1000, i.e. the upper surface of the support plate 10 in the figure; the second plate body 200 and the third plate body 300 are respectively located on the two sides; the material density of the second plate body 200 and the third plate body 300 is less than that of the first plate body 100.

[0043] Optionally, the first plate body 100 has a breaking elongation greater than that of the second plate body 200 and the third plate body 300. The first plate body 100 is made of stainless steel or titanium alloy; the second plate body 200 and the third plate body 300 are made of carbon fiber or titanium alloy, wherein the material of the second plate body 200 and the third plate body 300 can be different from that of the first plate body 100, for example, the second plate body 200 and the third plate body 300 are made of carbon fiber, and the first plate body 100 is made of stainless steel, titanium alloy or aluminum alloy; when the second plate body 200 and the third plate body 300 are made of titanium alloy or aluminum alloy, the first plate body 100 is made of stainless steel.

[0044] Optionally, the support plane 1000 comprises a first support area 1100, a second support area 1200 and a third support area 1300; the support surface of the first plate body 100 (i.e. the upper surface of the first plate body 100 in the figure) forms the first support area 1100; the support surface of the second plate body 200 (i.e. the upper surface in the figure) is located in the second support area 1200, and the support surface of the third plate body 300 (i.e. the upper surface of the second plate body 200 in the figure) is located in the third support area 1300; wherein the second support area 1200 and the third support area 1300 are respectively located on opposite sides of the first support area 1100. The first support area 1100 is a bending area, i.e. used to support the bending area in the middle of the flexible display screen module, and the second support area 1200 and the third support area 1300 are used as plane support areas to support the plane area of the flexible display screen module.

[0045] Optionally, the first plate body 100 is provided with a first accommodating groove 110 corresponding to the second support area 1200; the second plate body 200 is embedded in the first accommodating groove 110 and fixedly connected with the first plate body 100; the first plate body 100 is provided with a second accommodating groove 120 corresponding to the third support area 1300; the third plate body 300 is embedded in the second accommodating groove 120 and fixedly connected with the first plate body 100.

[0046] Optionally, the first plate body 100 is provided with a hollow pattern 101 corresponding to the first supporting area 1100. The hollow pattern 101 can reduce the bending strength of the first plate body 100 at the position corresponding to the first supporting area 1100, and enhance the bendable performance of the first plate body 100 at the position corresponding to the first supporting area 1100. Thus, the service life of the first plate body 100 is improved. Different from the foregoing embodiments, the first plate body 100 in the embodiment is provided with a blind groove 102 corresponding to the first supporting area 1100. The blind groove 102 is located on the opposite sides of the hollow pattern 101. The blind groove 102 can have two functions. One function is similar to the hollow pattern 101, which is used to reduce the bending strength of the first plate body 100 at the position corresponding to the first supporting area 1100, and thus enhance the bendable performance of the first plate body 100 at the position corresponding to the first supporting area 1100. Another function can be to fill glue to bond the flexible display screen module.

[0047] Please refer to Figure 7 and Figure 8 , Figure 7 is a schematic view of the overall structure of another embodiment of the support plate, Figure 8 is Figure 7 a schematic view of the structure of the support plate at C-C in the embodiment. The support plate 10 in the embodiment also includes a first plate body 100, a second plate body 200, and a third plate body 300. The second plate body 200 and the third plate body 300 are connected to the first plate body 100, and the first plate body 100, the second plate body 200, and the third plate body 300 together constitute a support plane 1000, that is, the upper surface of the support plate 10 in the figure. The second plate body 200 and the third plate body 300 are located on the two sides, respectively. The material density of the second plate body 200 and the third plate body 300 is less than that of the first plate body 100. The material and other performance parameters of the first plate body 100, the second plate body 200, and the third plate body 300 are described in the foregoing embodiments, and will not be described here.

[0048] Different from the foregoing embodiments, the second plate body 200 and the third plate body 300 in the embodiment are fixedly connected to the opposite sides of the first plate body 100. The specific connection mode can be bonding or one-piece injection molding.

[0049] Please refer to Figure 9 , Figure 9is a structural section diagram of another embodiment of the support plate of the present application; in this embodiment, the second plate body 200 and the third support plate 300 are respectively provided with stepped engagement surfaces (201, 301) at the connection positions between the opposite sides of the first plate body 100; so as to increase the bonding force of the second plate body 200 and the third support plate 300 with the first plate body 100. It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0050] Please refer to Figure 10 , Figure 10 is a structural section diagram of another embodiment of the support plate of the present application; in this embodiment, the first plate body 100 is provided with a hollow pattern 101 in the region corresponding to the first support area 1100, which functions to reduce the bending strength of the first plate body 100 at the position corresponding to the first support area 1100, and to enhance the foldable performance of the first plate body 100 at the position corresponding to the first support area 1100. Thus, the service life of the first plate body 100 is improved. Alternatively, the first plate body 100 in this embodiment can also be provided with blind grooves 102 on the opposite sides of the hollow pattern 101, wherein the blind grooves 102 can have two functions, one of which is similar to the hollow pattern 101, i.e. to reduce the bending strength of the first plate body 100 at the position corresponding to the first support area 1100, and to enhance the foldable performance of the first plate body 100 at the position corresponding to the first support area 1100; the other function can be to fill with glue to bond the flexible display screen module.

[0051] The support plate 10 for supporting the flexible display screen has the requirement of grounding, and the flexible display screen can be damaged by static electricity, so the support plate 10 needs to have extremely small resistance to conduct the current to the middle frame of the electronic device to avoid damaging the flexible display screen. Generally, the resistance of the support plate 10 is required to be ≤1 ohm. However, the resistance of carbon fiber is large, so in the embodiments of the present application, a conductive layer (210, 310) is plated on the support surface of the second plate body 200 and the support surface of the third support plate 300 (in this embodiment, the second plate body 200 and the third support plate 300 are both made of carbon fiber material). Specifically, the conductive layer can be improved in conductivity and surface finish by water plating / PVD and spraying gold / copper on the surface.

[0052] The support plate in the embodiment of the application adopts a structure of carbon fiber sheet splicing titanium alloy / stainless steel sheet. The stainless steel sheet / titanium alloy sheet has excellent bending performance in the bending area because the metal has good elongation and toughness. The weight of the under-screen support sheet is greatly reduced by the carbon fiber sheet, which can reduce about 5-10g. The carbon fiber sheet is plated with a conductive layer on the surface. The flatness of the carbon fiber surface and the performance of the grounding conductor can be improved.

[0053] Please refer to Figure 11 , Figure 11 is a structure split schematic diagram of an embodiment of the flexible display screen assembly of the application; the embodiment of the application further provides a flexible display screen assembly 10a, which comprises a flexible display module 20 and a support plate 10, and the flexible display module 20 is arranged on the support plane of the support plate 10. Specifically, the flexible display module 20 can be bonded to the support plane of the support plate 10 by using TPU adhesive or high-density (density≥700kg / m3) foam adhesive, thereby improving the poor light and shadow effect.

[0054] The display screen assembly provided by the embodiment of the application adopts a structure of splicing support plates made of different materials, which can ensure the bending reliability of the middle bending area, thereby ensuring the reliable support of the flexible display module, and can reduce the weight of the support plate, thereby reducing the weight of the display screen assembly using the support plate and improving the user experience.

[0055] Please refer to Figures 12 to 15 , Figure 12 is a folding state schematic diagram of an embodiment of the foldable electronic device of the application, Figure 13 is Figure 12 a state schematic diagram of the electronic device being unfolded, Figure 14 is Figure 13 a local structure split schematic diagram of the electronic device in Figure 15 is Figure 13A schematic view of a structure section of a middle electronic device at D-D. The electronic device comprises a housing 20a, a control circuit board 30a, a flexible display screen assembly 10a and a battery 40a; the housing 20a cooperates with the display screen assembly 10a to form an accommodating space, the control circuit board 30a is arranged in the accommodating space and electrically connected with a flexible display module of the flexible display screen assembly 10a, for controlling the working state of the flexible display module. The battery 40a is also arranged in the accommodating space formed by the housing 20a and the display screen assembly 10a, for providing electric energy. Wherein, the housing 20a can comprise a first support plate 20a1, a second support plate 20a2 and a rotating shaft 20a3, the first support plate 20a1 and the second support plate 20a2 are respectively connected with the rotating shaft 20a3. The flexible display screen assembly 10a is fixed on the first support plate 20a1, the second support plate 20a2 and the rotating shaft 20a3, and can be switched between the folding and opening states with the first support plate 20a1, the second support plate 20a2 and the rotating shaft 20a3 (arrow direction). Figure 15 The detailed structural features of the flexible display screen assembly 10a can refer to the related description in the foregoing embodiments, and the structural features of other parts of the foldable electronic device are within the understanding of those skilled in the art, which will not be described here.

[0056] The above only describes some embodiments of the present application, and does not limit the protection scope of the present application, and any equivalent device or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A support plate for supporting a flexible display screen, characterized by, The support plate comprises a first plate body, a second plate body and a third plate body; The second plate body and the third plate body are connected with the first plate body respectively, and the first plate body, the second plate body and the third plate body jointly constitute a support plane; At least part of the structure of the first plate body is located in the middle of the support plane; the density of the second plate body and the third plate body is less than that of the first plate body; The support plane comprises at least a first support area, a second support area and a third support area; the support surface of the first plate body forms the first support area; the support surface of the second plate body is located in the second support area, and the support surface of the third plate body is located in the third support area; the second support area and the third support area are located on the opposite sides of the first support area respectively; The first plate body is provided with a first accommodating groove corresponding to the second support area; the second plate body is embedded in the first accommodating groove and fixedly connected with the first plate body; the first plate body is provided with a second accommodating groove corresponding to the third support area; the third plate body is embedded in the second accommodating groove and fixedly connected with the first plate body.

2. The support plate of claim 1, wherein The elongation at break of the first plate body is greater than that of the second plate body and the third plate body.

3. The support plate of claim 2, wherein, The material of the first plate body is selected from any one of stainless steel, titanium alloy and aluminum alloy.

4. The support plate of claim 2, wherein The material of the second plate body and the third plate body is selected from any one of carbon fiber, titanium alloy and aluminum alloy.

5. The support plate of claim 1, wherein The second plate body and the third plate body are fixedly connected with the opposite sides of the first plate body respectively.

6. The support plate of claim 5, wherein, The connecting position between the second plate body and the third plate body and the opposite sides of the first plate body is provided with a stepped engagement surface.

7. The support plate of claim 5, wherein The support surface of the second plate body and the support surface of the third plate body are plated with a conductive layer.

8. The support plate of claim 1, wherein The first plate body is provided with a hollow pattern corresponding to the region of the first support area.

9. The support plate of claim 8, wherein, The first plate body is provided with a blind groove corresponding to the region of the first support area, and the blind groove is located on the opposite sides of the hollow pattern.

10. A flexible display screen assembly, characterized by The flexible display screen assembly comprises a flexible display module and the support plate according to any one of claims 1-9, and the flexible display module is arranged on the support plane of the support plate.

11. A foldable electronic device, characterized by The electronic device comprises a shell, a control circuit board and the flexible display screen assembly according to claim 10; the shell and the display screen assembly cooperate to form a containing space, the control circuit board is arranged in the containing space and electrically connected with the flexible display module of the flexible display screen assembly. The electronic device comprises a shell, a control circuit board and the flexible display screen assembly according to claim 10; the shell and the display screen assembly cooperate to form a containing space, the control circuit board is arranged in the containing space and electrically connected with the flexible display module of the flexible display screen assembly.

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