Supporting piece, flexible display screen assembly and foldable electronic equipment

Abstract

The invention provides a supporting piece, a flexible display screen assembly and foldable electronic equipment. The supporting piece comprises a first carbon fiber resin layer, a second carbon fiber resin layer and a third carbon fiber resin layer which are sequentially arranged in a stacked mode. The second carbon fiber resin layer comprises a supporting part and a bendable part which are connected, and the elastic modulus of the supporting part is larger than that of the bendable part. The supporting piece provided by the invention can be thinner.

Description

Technical Field

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

[0002] With the development of flexible display electronics technology, the application of foldable electronic devices such as foldable screen mobile phones is becoming increasingly widespread. To better support the flexible display screen of foldable electronic devices, a support plate is usually installed between the folding mechanism and the flexible display screen. However, the support plate in related technologies is heavy and too thick, which is not conducive to the lightweight and thinness of foldable electronic devices. Summary of the invention

[0003] The embodiment of the present application provides a support member that can be made thinner.

[0004] A first aspect embodiment of the present application provides a support member, which includes a first carbon fiber resin layer, a second carbon fiber resin layer, and a third carbon fiber resin layer stacked in sequence; the second carbon fiber resin layer includes a connected support portion and a bendable portion, and the elastic modulus of the support portion is greater than the elastic modulus of the bendable portion.

[0005] A second embodiment of the present application provides a flexible display screen assembly, comprising:

[0006] A flexible display screen having a display surface; and

[0007] The supporting member described in the embodiment of the present application is arranged on a side of the flexible display screen away from the display surface, and is used to support the flexible display screen.

[0008] A third embodiment of the present application provides a foldable electronic device, comprising:

[0009] The flexible display screen assembly described in the embodiment of the present application; and

[0010] a processor, the processor being electrically connected to the flexible display screen of the flexible display screen assembly and configured to control the flexible display screen to perform display;

[0011] A foldable mechanism is arranged on the side of the support member of the flexible display screen assembly facing away from the flexible display screen, and is used to support the flexible display screen assembly. The foldable mechanism is also used to drive the foldable electronic device to fold or flatten.

[0012] The support member of the present application includes a first carbon fiber resin layer, a second carbon fiber resin layer, and a third carbon fiber resin layer that are sequentially stacked. The three film layers of the support member of the present application are all carbon fiber resin layers. Carbon fiber has a relatively high elastic modulus and mechanical strength, so that the support member has a relatively high stiffness and supportability, and can be made thinner, making the support member thinner and lighter. In addition, the second carbon fiber resin layer of the present application includes a connected support portion and a bendable portion. The elastic modulus of the support portion is greater than that of the bendable portion. The support portion has a relatively large elastic modulus and can better support the flexible display screen, enabling the flexible display screen to have a better light and shadow effect; the bendable portion has a relatively small elastic modulus, so that the corresponding part of the support member at the bendable portion has better bendability. The width of the slot on the support member corresponding to the bendable portion can be made narrower, which can better improve the impact resistance of the bendable portion and reduce the degree of creases and film printing in the area of the flexible display screen corresponding to the bendable portion. Description of the Drawings

[0013] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 is a schematic plan view of a support member according to an embodiment of the present application.

[0015] Figure 2 is a support member according to an embodiment of the present application along Figure 1 The cross-sectional structure schematic diagram in the A-A direction.

[0016] Figure 3 is a schematic structural diagram of a support member according to an embodiment of the present application, where the bendable area is in a bent state.

[0017] Figure 4 is a schematic plan view of a support member according to another embodiment of the present application.

[0018] Figure 5 is a schematic plan view of a support member according to still another embodiment of the present application.

[0019] Figure 6 is a schematic plan view of a flexible display screen assembly according to an embodiment of the present application.

[0020] Figure 7 is a flexible display screen assembly according to an embodiment of the present application along Figure 6 The cross-sectional structure schematic diagram in the B-B direction.

[0021] Figure 8 FIG. 0 is a schematic structural diagram of a foldable electronic device according to an embodiment of the present application in a flattened state.

[0022] Figure 9 FIG. 5 is a schematic structural diagram of a foldable electronic device according to an embodiment of the present application in a folded state.

[0023] Figure 10 FIG. 9 is a circuit block diagram of a foldable electronic device according to an embodiment of the present application.

[0024] Figure 11 FIG. 13 is a photograph of the support member of Example 1 assembled to the flexible display assembly after 10,000 bending tests.

[0025] Figure 12 FIG. 17 is a photograph of the support member of Comparative Example 2 assembled to the flexible display assembly after 10,000 bending tests.

[0026] Explanation of reference numerals:

[0027] 100 - support member, 10 - first carbon fiber resin layer, 20 - second carbon fiber resin layer, 21 - support portion, 22 - bendable portion, 30 - third carbon fiber resin layer, 101 - support area, 102 - bendable area, 103 - slot, 200 - flexible display assembly, 210 - flexible display, 211 - display surface, 300 - foldable electronic device, 310 - processor, 320 - folding mechanism, 321 - first middle frame, 322 - rotating shaft, 323 - second middle frame, 330 - memory, 340 - camera module. Detailed Description of the Embodiment

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0029] The terms "first", "second", etc. in the specification and claims of the present application and the above accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof 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 optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0030] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0031] It should be noted that for ease of description, in the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted.

[0032] With the development of flexible display electronic technology, foldable electronic devices such as foldable mobile phones are becoming more and more widely used. In order to better support the flexible display screen of the foldable electronic device, a support plate is usually provided between the foldable mechanism and the flexible display screen. However, in the related art, the support plate is heavy and too thick, which is not conducive to the thinning of the foldable electronic device.

[0033] Figure 1 is a schematic plan view of a support member 100 according to an embodiment of the present application. Figure 2 is a support member 100 according to an embodiment of the present application along Figure 1 the cross-sectional structure schematic diagram in the A-A direction in Figure 3 is a schematic structural diagram of a support member 100 according to an embodiment of the present application, wherein the bendable area 102 is in a bent state.

[0034] Please refer to Figure 1 and Figure 2 , the embodiments of the present application provide a support member 100, the support member 100 includes a first carbon fiber resin layer 10, a second carbon fiber resin layer 20 and a third carbon fiber resin layer 30 which are sequentially stacked; the second carbon fiber resin layer 20 includes a connected support portion 21 and a bendable portion 22, and the elastic modulus of the support portion 21 is greater than the elastic modulus of the bendable portion 22.

[0035] The support member 100 in the embodiments of the present application can be applied to flexible display screen assemblies of foldable electronic devices such as foldable mobile phones, foldable tablet computers, foldable e-readers, foldable laptop computers, etc., for supporting the flexible display screen of the flexible display screen assembly.

[0036] Optionally, the support member 100 includes a support area 101 and a bendable area 102, the support portion 21 is disposed corresponding to the support area 101, and the bendable portion 22 is disposed corresponding to the bendable area 102.

[0037] It can be understood that the arrangement direction of the support portion 21 and the bendable portion 22 is perpendicular to the thickness direction of the support member 100.

[0038] It should be noted that the bendable area 102 of the support member 100 has a flat state (such as Figure 1 shown) and a bent state (such as Figure 3As shown). When the bendable region 102 of the support member 100 is in a bent state, the bendable portion 22 can be arc-shaped, U-shaped, water droplet-shaped, etc. In the schematic diagrams of the drawings of the present application, only one form of the bent state of the bendable region 102 of the support member 100 is schematically shown, and it should not be construed as a limitation on the bent state of the embodiments of the present application, nor should it be construed as a limitation on the support member 100 of the present application. When the bendable region 102 is in a bent state, the two support regions 101 connected to the bendable region 102 are stacked in the thickness direction of the support member 100; when the bendable region 102 is in a flat state, the bendable region 102 and the two support regions 101 connected to the bendable region 102 are flush.

[0039] It can be understood that the first carbon fiber resin layer 10, the second carbon fiber resin layer 20, and the third carbon fiber resin layer 30 are connected in sequence, that is, the first carbon fiber resin layer 10, the second carbon fiber resin layer 20, and the third carbon fiber resin layer 30 are connected as a whole.

[0040] It should be noted that both the support portion 21 and the bendable portion 22 are carbon fiber resin layers.

[0041] It should be noted that the stacking direction of the first carbon fiber resin layer 10, the second carbon fiber resin layer 20, and the third carbon fiber resin layer 30 is the thickness direction of the support member 100.

[0042] Optionally, the support member 100 is a sheet-like structure or a plate-like structure.

[0043] Optionally, the arrangement direction of the support portion 21 and the bendable portion 22 is perpendicular to the stacking direction of the first carbon fiber resin layer 10, the second carbon fiber resin layer 20, and the third carbon fiber resin layer 30. It can be understood that the support portion 21 and the bendable portion 22 are arranged on the same layer, the first carbon fiber resin layer 10 covers the support portion 21 and the bendable portion 22, and the third carbon fiber resin layer 30 covers the support portion 21 and the bendable portion 22.

[0044] Optionally, the number of the support portions 21 can be one or more. Specifically, the number of the support portions 21 can be, but is not limited to, one, two, three, four, five, etc. Optionally, the number of the bendable portions 22 can be one or more. Specifically, the number of the bendable portions 22 can be, but is not limited to, one, two, three, four, five, etc. When at least one of the support portion 21 and the bendable portion 22 is multiple, the support portion 21 and the bendable portion 22 are alternately arranged in sequence.

[0045] The term "multiple" means greater than or equal to two.

[0046] Such as Figure 1As shown, in a specific example, the number of the supporting parts 21 is two, and the number of the bendable parts 22 is one. The bendable part 22 is located between the two supporting parts 21, that is, the supporting parts 21, the bendable part 22, and the supporting parts 21 are arranged in sequence and connected in sequence. It can be understood that in this embodiment, the support member 100 is a double-fold structure and is applied to a double-fold foldable electronic device.

[0047] Figure 4 It is a schematic plan view of the support member 100 according to another embodiment of the present application.

[0048] As Figure 4 shown, in another specific example, the number of the supporting parts 21 is three, and the number of the bendable parts 22 is two. The supporting parts 21 and the bendable parts 22 are alternately arranged in sequence, that is, the supporting parts 21, the bendable parts 22, the supporting parts 21, the bendable parts 22, and the supporting parts 21 are arranged in sequence and connected in sequence. It can be understood that in this embodiment, the support member 100 is a triple-fold structure and is applied to a triple-fold foldable electronic device.

[0049] In the related art, in order to make the part of the support member 100 corresponding to the bendable part 22 (i.e., the bendable area 102) have better bendable performance, a through groove is usually provided at the position of the support member 100 corresponding to the bendable part 22, and the common width is usually 0.15 mm. Although this increases the bending performance of the bendable area 102 of the support member 100, when the support member 100 is applied to a flexible display screen assembly, the impact resistance of the flexible display screen corresponding to the bendable area 102 is greatly reduced, and creases or film prints are likely to appear.

[0050] The support member 100 of the present application includes a first carbon fiber resin layer 10, a second carbon fiber resin layer 20, and a third carbon fiber resin layer 30 that are sequentially stacked. The three film layers of the support member 100 of the present application are all carbon fiber resin layers. Carbon fiber has a relatively high elastic modulus and mechanical strength, so that the support member 100 has a relatively high stiffness and supportability, can be made thinner, and makes the support member 100 more lightweight and thinner. In addition, the second carbon fiber resin layer 20 of the present application includes a connected support part 21 and a bendable part 22. The elastic modulus of the support part 21 is greater than that of the bendable part 22. The support part 21 has a relatively large elastic modulus and can better support the flexible display screen, so that the flexible display screen has a better light and shadow effect; the bendable part 22 has a relatively small elastic modulus, so that the part of the support member 100 corresponding to the bendable part 22 has better bendability. The width of the slot on the support member 100 corresponding to the bendable part 22 can be made narrower, which can better improve the impact resistance of the bendable part 22 and reduce the degree of creases and film prints in the area of the flexible display screen corresponding to the bendable part 22.

[0051] In some embodiments, the elongation rate (also known as the elongation at break) of the bendable portion 22 is greater than that of the support portion 21.

[0052] When the support member 100 is applied to a flexible display screen assembly, the bendable area 102 of the support member 100 repeatedly switches between a flat state and a bent state during use. Therefore, it is required that the bendable area 102 of the support member 100 not only be able to support the flexible display screen well but also have good bendability. In this embodiment, the bendable portion 22 has a relatively large elongation rate, so that when the bendable area 102 of the support member 100 is bent, especially when bent at a small angle (for example, the bending radius is 1.5 mm, abbreviated as R1.5), the bendable area 102 of the support member 100 is less likely to break. The width of the slot on the bendable area 102 of the support member 100 can be made narrower, which can better improve the impact resistance of the bendable portion 22 and reduce the film printing degree of the area of the flexible display screen corresponding to the bendable portion 22.

[0053] In some embodiments, the tensile strength of the bendable portion 22 is greater than that of the support portion 21.

[0054] When the support member 100 is applied to a flexible display screen assembly, the bendable area 102 of the support member 100 repeatedly switches between a flat state and a bent state during use. When the bendable area 102 of the support member 100 is bent, the bendable area 102 will be continuously stretched. In this embodiment, the bendable portion 22 has a relatively large tensile strength, so that when the bendable area 102 of the support member 100 is bent, especially when bent at a small angle (for example, the bending radius is 1.5 mm, abbreviated as R1.5), the bendable area 102 of the support member 100 is less likely to break. The width of the slot on the bendable area 102 of the support member 100 can be made narrower, which can better improve the impact resistance of the bendable portion 22 and reduce the film printing degree of the area of the flexible display screen corresponding to the bendable portion 22.

[0055] In some embodiments, the thermal conductivity of the support portion 21 is greater than that of the bendable portion 22.

[0056] When the support member 100 is applied to a foldable electronic device, the support portion 21 corresponds to the large surface area of the foldable electronic device (such as the middle frame area of the folding mechanism), the bendable portion 22 corresponds to the rotation axis area of the foldable electronic device, and the thermal conductivity of the support portion 21 is greater than that of the bendable portion 22. In this way, the overall support member 100 can have a higher thermal conductivity, so that the heat generated locally in the foldable electronic device can be transferred to the entire foldable electronic device more quickly and then transferred to the external environment, avoiding local overheating of the foldable electronic device and preventing phenomena such as poor operation and freezing during the use of the foldable electronic device, thereby improving the user experience of the foldable electronic device.

[0057] In some embodiments, the second carbon fiber resin layer 20 satisfies at least one of the following conditions:

[0058] The elastic modulus of the support portion 21 ranges from 300 GPa to 600 GPa;

[0059] The elongation of the support portion 21 ranges from 0.2% to 1%;

[0060] The tensile strength of the support portion 21 ranges from 1500 MPa to 4500 MPa;

[0061] The thermal conductivity of the support portion 21 ranges from 100 W / m·k to 450 W / m·k;

[0062] The elastic modulus of the bendable portion 22 ranges from 50 GPa to 300 GPa;

[0063] The elongation of the bendable portion 22 ranges from 1% to 2.3%;

[0064] The tensile strength of the bendable portion 22 ranges from 4000 MPa to 6000 MPa; and

[0065] The thermal conductivity of the bendable portion 22 ranges from 50 W / m·k to 150 W / m·k.

[0066] In the embodiments of the present application, when it comes to the numerical range from a to b, unless otherwise specified, it means that the numerical value can be any value between a and b, including the endpoint value a and the endpoint value b.

[0067] Specifically, the elastic modulus of the support portion 21 may be, but is not limited to, 300 GPa, 330 GPa, 350 GPa, 380 GPa, 400 GPa, 430 GPa, 450 GPa, 480 GPa, 500 GPa, 530 GPa, 550 GPa, 580 GPa, 600 GPa, etc. If the elastic modulus of the support portion 21 is too small, the rigidity of the support portion 21 is small, reducing the support effect of the support area 101 of the support member 100 on the flexible display screen and reducing the light and shadow effect of the flexible display screen; if the elastic modulus of the support portion 21 is too large, the modulus of the carbon fiber cloth of the support portion 21 is too high, and during preparation, it is not easy to spread the yarn, and it is easy to have uneven yarn spreading. The gram weight of the carbon fiber cloth cannot be made low, increasing the preparation cost of the support member 100.

[0068] Specifically, the elongation of the support portion 21 may be, but is not limited to, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. If the elongation of the support portion 21 is too low, the carbon fiber is likely to break during preparation; if the elongation of the support portion 21 is too high, it is difficult for the support portion 21 to have both a high elastic modulus and the rigidity of the support portion 21 will be reduced.

[0069] Specifically, the tensile strength of the support portion 21 may be, but is not limited to, 1500 MPa, 1800 MPa, 2000 MPa, 2300 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3300 MPa, 3500 MPa, 3800 MPa, 4000 MPa, 4300 MPa, 4500 MPa, etc. If the tensile strength of the support portion 21 is too low, the carbon fiber cloth is likely to break during yarn spreading; if the tensile strength of the support portion 21 is too high, the cost of the support portion 21 will increase.

[0070] Specifically, the thermal conductivity of the support portion 21 may be, but is not limited to, 100 W / m·k, 130 W / m·k, 150 W / m·k, 180 W / m·k, 200 W / m·k, 230 W / m·k, 250 W / m·k, 280 W / m·k, 300 W / m·k, 330 W / m·k, 350 W / m·k, 380 W / m·k, 400 W / m·k, 430 W / m·k, 450 W / m·k, etc. If the thermal conductivity of the support portion 21 is too small, the heat dissipation effect of the support portion 21 is reduced; if the thermal conductivity of the support portion 21 is too high, the cost of the support portion 21 will increase.

[0071] Specifically, the elastic modulus of the bendable portion 22 can be, but is not limited to, 50 GPa, 80 GPa, 100 GPa, 130 GPa, 150 GPa, 180 GPa, 200 GPa, 230 GPa, 250 GPa, 280 GPa, 300 GPa, etc. If the elastic modulus of the bendable portion 22 is too small, the rigidity of the bendable portion 22 is small, reducing the supporting effect of the support area 101 of the support member 100 on the flexible display screen and reducing the light and shadow effect of the flexible display screen. If the elastic modulus of the bendable portion 22 is too large, the modulus of the carbon fiber cloth of the bendable portion 22 is too high. During preparation, it is not easy to spread the yarn, and the yarn is easily unevenly spread. The gram weight of the carbon fiber cloth cannot be lowered, increasing the preparation cost of the support member 100. In addition, if the elastic modulus of the bendable portion 22 is too high, the bending performance of the bendable area 102 of the support member 100 is reduced, and when the bendable area 102 is bent at a small angle, cracking or breaking is likely to occur.

[0072] Specifically, the elongation of the bendable portion 22 can be, but is not limited to, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, etc. If the elongation of the bendable portion 22 is too low, the bending performance of the bendable area 102 of the support member 100 is reduced; if the elongation of the bendable portion 22 is too high, the supporting effect of the bendable area 102 of the support member 100 on the flexible display screen is reduced.

[0073] Specifically, the tensile strength of the bendable portion 22 can be, but is not limited to, 4000 MPa, 4300 MPa, 4500 MPa, 4800 MPa, 5000 MPa, 5300 MPa, 5500 MPa, 5800 MPa, 6000 MPa, etc. If the tensile strength of the bendable portion 22 is too low, the bendable area 102 of the support member 100 is prone to creases or fractures during repeated bending; if the tensile strength of the bendable portion 22 is too high, the bending performance of the bendable area 102 of the support member 100 is reduced.

[0074] Specifically, the thermal conductivity of the bendable portion 22 can be, but is not limited to, 50 W / m·k, 60 W / m·k, 70 W / m·k, 80 W / m·k, 90 W / m·k, 100 W / m·k, 110 W / m·k, 120 W / m·k, 130 W / m·k, 140 W / m·k, 150 W / m·k, etc. If the thermal conductivity of the bendable portion 22 is too small, the heat dissipation effect of the bendable portion 22 is reduced; if the thermal conductivity of the bendable portion 22 is too high, the cost of the bendable portion 22 is increased.

[0075] In some embodiments, the elastic modulus of the first carbon fiber resin layer 10 is less than that of the bendable portion 22; the elastic modulus of the third carbon fiber resin layer 30 is less than that of the bendable portion 22.

[0076] In this embodiment, the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30 are used as the surface layers. If their elastic moduli are too high, it is not easy to spread the yarn during the preparation of the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30, and the yarn is likely to be unevenly spread. In this embodiment, the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30 with lower elastic moduli are used as the surface layers. During the preparation of the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30, the yarn can be spread better, thus having a higher yield rate, which can better improve the preparation yield rate of the support member 100. In addition, the yarn is spread more evenly, enabling the support member 100 to have a better appearance effect and reducing the preparation cost of the support member 100.

[0077] In some embodiments, the elongation of the first carbon fiber resin layer 10 is greater than that of the bendable portion 22; the elongation of the third carbon fiber resin layer 30 is greater than that of the bendable portion 22.

[0078] In this embodiment, the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30 are used as the surface layers. When the support member 100 is repeatedly bent, compared with the middle second carbon fiber resin layer 20, the first carbon fiber resin layer 10 and the third carbon fiber resin layer are subjected to greater compressive stress and tensile stress. Therefore, the elongation of the first carbon fiber resin layer 10 is greater than that of the bendable portion 22; the elongation of the third carbon fiber resin layer 30 is greater than that of the bendable portion 22, which can enable the support member 100 to have better bending performance and be less likely to generate creases or break during repeated bending.

[0079] In some embodiments, the first carbon fiber resin layer 10 satisfies at least one of the following conditions:

[0080] The range of the elastic modulus of the first carbon fiber resin layer 10 is 50 GPa to 200 GPa;

[0081] The range of the elongation of the first carbon fiber resin layer 10 is 1.8% to 2.3%;

[0082] The range of the tensile strength of the first carbon fiber resin layer 10 is 4000 MPa to 6000 MPa; and

[0083] The range of the thermal conductivity of the first carbon fiber resin layer 10 is 50 W / m·k to 150 W / m·k;

[0084] Specifically, the elastic modulus of the first carbon fiber resin layer 10 can be, but is not limited to, 50 GPa, 80 GPa, 100 GPa, 130 GPa, 150 GPa, 180 GPa, 200 GPa, etc. If the elastic modulus of the first carbon fiber resin layer 10 is too low, the rigidity of the first carbon fiber resin layer 10 is low, which reduces the supporting effect of the support area 101 of the support member 100 on the flexible display screen and reduces the light and shadow effects of the flexible display screen. If the elastic modulus of the first carbon fiber resin layer 10 is too large, the elastic modulus of the carbon fiber cloth of the first carbon fiber resin layer 10 is too high. During preparation, it is difficult to spread the yarn, the yarn spreading is prone to unevenness, and the yarn is prone to breakage during the spreading process. There is likely to be a lot of sand hair, which reduces the appearance of the first carbon fiber resin layer 10. In addition, the gram weight of the carbon fiber cloth is not low, which increases the preparation cost of the support member 100. In addition, the elastic modulus of the first carbon fiber resin layer 10 is too high, which reduces the bending performance of the bendable area 102 of the support member 100. When the bendable area 102 is bent at a small angle, it is prone to cracking or breaking.

[0085] Specifically, the elongation of the first carbon fiber resin layer 10 can be, but is not limited to, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, etc. If the elongation of the first carbon fiber resin layer 10 is too low, the bending performance of the bendable region 102 of the support member 100 is reduced, and the first carbon fiber resin layer 10 is prone to breakage during the yarn unwinding process during preparation, and is prone to the presence of a large amount of sand, which reduces the appearance of the first carbon fiber resin layer 10. If the elongation of the first carbon fiber resin layer 10 is too high, the support function of the bendable region 102 of the support member 100 for the flexible display screen is reduced.

[0086] Specifically, the tensile strength of the first carbon fiber resin layer 10 can be, but is not limited to, 4000 MPa, 4300 MPa, 4500 MPa, 4800 MPa, 5000 MPa, 5300 MPa, 5500 MPa, 5800 MPa, 6000 MPa, etc. If the tensile strength of the first carbon fiber resin layer 10 is too low, the bendable region 102 of the support member 100 may be prone to creases or breakage during repeated bending. If the tensile strength of the first carbon fiber resin layer 10 is too high, the bending performance of the bendable region 102 of the support member 100 may be reduced.

[0087] Specifically, the thermal conductivity of the first carbon fiber resin layer 10 can be, but is not limited to, 50 W / m·k, 60 W / m·k, 70 W / m·k, 80 W / m·k, 90 W / m·k, 100 W / m·k, 110 W / m·k, 120 W / m·k, 130 W / m·k, 140 W / m·k, 150 W / m·k, etc. If the thermal conductivity of the first carbon fiber resin layer 10 is too low, the heat dissipation effect of the first carbon fiber resin layer 10 is reduced; if the thermal conductivity of the first carbon fiber resin layer 10 is too high, the cost of the first carbon fiber resin layer 10 is increased.

[0088] In some embodiments, the third carbon fiber resin layer 30 satisfies at least one of the following conditions:

[0089] The elastic modulus of the third carbon fiber resin layer 30 is in a range of 50 GPa to 200 GPa;

[0090] The elongation of the third carbon fiber resin layer 30 is in a range of 1.8% to 2.3%;

[0091] The tensile strength of the third carbon fiber resin layer 30 is in a range of 4000 MPa to 6000 MPa; and

[0092] The thermal conductivity of the third carbon fiber resin layer 30 is in a range of 50 W / m·k to 150 W / m·k.

[0093] Specifically, the elastic modulus of the third carbon fiber resin layer 30 can be, but is not limited to, 50 GPa, 80 GPa, 100 GPa, 130 GPa, 150 GPa, 180 GPa, 200 GPa, etc. If the elastic modulus of the third carbon fiber resin layer 30 is too low, the rigidity of the third carbon fiber resin layer 30 is low, which reduces the supporting effect of the support area 101 of the support member 100 on the flexible display screen and reduces the light and shadow effects of the flexible display screen. If the elastic modulus of the third carbon fiber resin layer 30 is too large, the modulus of the carbon fiber cloth of the third carbon fiber resin layer 30 is too high. During preparation, it is difficult to spread the yarn, the yarn spreading is prone to unevenness, and the yarn is prone to breakage during the spreading process. There is likely to be a lot of sand hair, which reduces the appearance of the third carbon fiber resin layer 30. In addition, the gram weight of the carbon fiber cloth is not low, which increases the preparation cost of the support member 100. In addition, the elastic modulus of the third carbon fiber resin layer 30 is too high, which reduces the bending performance of the bendable area 102 of the support member 100. When the bendable area 102 is bent at a small angle, it is prone to cracking or breaking.

[0094] Specifically, the elongation rate of the third carbon fiber resin layer 30 can be, but is not limited to, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, etc. If the elongation rate of the third carbon fiber resin layer 30 is too low, the bending performance of the bendable area 102 of the support member 100 will be reduced, and it is easy to break during the yarn spreading process, and there are likely to be many sand hairs, reducing the appearance effect of the third carbon fiber resin layer 30. In addition, if the elongation rate of the third carbon fiber resin layer 30 is too high, the supporting effect of the bendable area 102 of the support member 100 on the flexible display screen will be reduced.

[0095] Specifically, the tensile strength of the third carbon fiber resin layer 30 can be, but is not limited to, 4000 MPa, 4300 MPa, 4500 MPa, 4800 MPa, 5000 MPa, 5300 MPa, 5500 MPa, 5800 MPa, 6000 MPa, etc. If the tensile strength of the third carbon fiber resin layer 30 is too low, the bendable area 102 of the support member 100 is likely to have creases or fractures during repeated bending; if the tensile strength of the third carbon fiber resin layer 30 is too high, the bending performance of the bendable area 102 of the support member 100 will be reduced.

[0096] Specifically, the thermal conductivity of the third carbon fiber resin layer 30 can be, but is not limited to, 50 W / m·k, 60 W / m·k, 70 W / m·k, 80 W / m·k, 90 W / m·k, 100 W / m·k, 110 W / m·k, 120 W / m·k, 130 W / m·k, 140 W / m·k, 150 W / m·k, etc. If the thermal conductivity of the third carbon fiber resin layer 30 is too small, the heat dissipation effect of the third carbon fiber resin layer 30 will be reduced; if the thermal conductivity of the third carbon fiber resin layer 30 is too high, the cost of the third carbon fiber resin layer 30 will increase.

[0097] Please refer to again Figure 1 and Figure 2 , in some embodiments, the stacking direction of the first carbon fiber resin layer 10, the second carbon fiber resin layer 20, and the third carbon fiber resin layer 30 is the thickness direction of the support member 100. The support member 100 extends in a plane perpendicular to the thickness direction. The extension plane of the support member 100 has a first direction (also referred to as the 0° direction or the bending direction, such as Figure 1 shown by the double arrow X) and a second direction (also referred to as the 90° direction, such as Figure 1 shown by the double arrow Y) that are perpendicular to each other. The first direction is the arrangement direction of the support portion 21 and the bendable portion 22;

[0098] The first carbon fiber resin layer 10 includes a first carbon fiber cloth and a first resin. The first resin wraps the surface of the first carbon fiber cloth. The first carbon fiber cloth includes first carbon fiber threads, and the range of the angle between the extending direction of the first carbon fiber threads and the first direction is from 0° to 5°.

[0099] The support portion 21 includes a second carbon fiber cloth and a second resin. The second resin wraps the surface of the second carbon fiber cloth. The second carbon fiber cloth includes second carbon fiber threads, and the range of the angle between the extending direction of the second carbon fiber threads and the first direction is from 85° to 95°.

[0100] The bendable portion 22 includes a third carbon fiber cloth and a third resin. The third resin wraps the surface of the third carbon fiber cloth. The third carbon fiber cloth includes third carbon fiber threads, and the range of the angle between the extending direction of the third carbon fiber threads and the first direction is from 85° to 95°.

[0101] The third carbon fiber resin layer 30 includes a fourth carbon fiber cloth and a fourth resin. The fourth resin wraps the surface of the fourth carbon fiber cloth. The fourth carbon fiber cloth includes fourth carbon fiber threads, and the range of the angle between the extending direction of the fourth carbon fiber threads and the first direction is from 0° to 5°.

[0102] It should be noted that the first carbon fiber cloth includes multiple strands of first carbon fiber threads, the second carbon fiber cloth includes multiple strands of second carbon fiber threads, the third carbon fiber cloth includes multiple strands of third carbon fiber threads, and the fourth carbon fiber cloth includes multiple strands of fourth carbon fiber threads.

[0103] It should be noted that the first carbon fiber cloth, the second carbon fiber cloth, the third carbon fiber cloth, and the fourth carbon fiber cloth are all unidirectional carbon fiber cloths. In other words, the extending directions of the carbon fiber threads in each carbon fiber cloth are substantially the same.

[0104] It can be understood that the first direction, the second direction, and the thickness direction are perpendicular to each other in pairs. The second direction is a direction perpendicular to the first direction and perpendicular to the thickness direction of the support member 100.

[0105] It can be understood that the range of the angle between the extending direction of the second carbon fiber threads and the second direction is from 0° to 5°. The range of the angle between the extending direction of the third carbon fiber threads and the second direction is from 0° to 5°.

[0106] Specifically, the angle between the extending direction of the first carbon fiber threads and the first direction can be, but is not limited to, 0°, 1°, 2°, 3°, 4°, 5°, etc. In a specific example, the first carbon fiber threads extend along the first direction.

[0107] Specifically, the included angle between the extending direction of the second carbon fiber line and the first direction can be, but is not limited to, 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94°, 95°, etc. In a specific example, the second carbon fiber line extends along the second direction, that is, the included angle between the extending direction of the second carbon fiber line and the first direction is 90°. In other words, the extending direction of the second carbon fiber line is perpendicular to the first direction.

[0108] Specifically, the included angle between the extending direction of the third carbon fiber line and the first direction can be, but is not limited to, 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94°, 95°, etc. In a specific example, the third carbon fiber line extends along the second direction, that is, the included angle between the extending direction of the third carbon fiber line and the first direction is 90°. In other words, the extending direction of the third carbon fiber line is perpendicular to the first direction.

[0109] Specifically, the included angle between the extending direction of the fourth carbon fiber line and the first direction can be, but is not limited to, 0°, 1°, 2°, 3°, 4°, 5°, etc. In a specific example, the fourth carbon fiber line extends along the first direction.

[0110] In this embodiment, by designing the extending directions and angles of the first carbon fiber line, the second carbon fiber line, the third carbon fiber line and the fourth carbon fiber line, the extending directions of the carbon fiber lines in the second carbon fiber resin layer 20 and the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30 are substantially perpendicular, so that the support member 100 has a relatively high elastic modulus in both the first direction and the second direction, and can better support the flexible display screen.

[0111] Optionally, the first carbon fiber cloth can be a polyacrylonitrile-based carbon fiber cloth (abbreviated as PANCF), and the polyacrylonitrile-based carbon fiber cloth can be, but is not limited to, at least one of T800 carbon fiber cloth (density about 1.8 g / m 3 ), M40 carbon fiber cloth (density about 1.8 g / m 3 ), and T700 carbon fiber cloth (density about 1.8 g / m 3 ).

[0112] Optionally, the elastic modulus of the first carbon fiber cloth is in the range of 200GPa to 300GPa. Specifically, the elastic modulus of the first carbon fiber cloth can be, but is not limited to, 200GPa, 220GPa, 240GPa, 260GPa, 280GPa, 300GPa, etc. If the elastic modulus of the first carbon fiber cloth is too small, the elastic modulus and rigidity of the first carbon fiber resin layer 10 are too small, which reduces the supporting effect of the support member 100 on the flexible display screen and reduces the light and shadow effect of the flexible display screen; if the elastic modulus of the first carbon fiber cloth is too large, the prepreg of the first carbon fiber resin layer 10 made of the first carbon fiber cloth is difficult to spread during preparation, and the yarn is easily unevenly spread, and it is easy to break during the yarn spreading process, and there is a lot of sand hair, which reduces the appearance of the first carbon fiber resin layer 10.

[0113] Optionally, the elongation of the first carbon fiber cloth ranges from 1.8% to 2.3%. Specifically, the elongation of the first carbon fiber cloth is 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, etc. If the elongation of the first carbon fiber cloth is too low, the carbon fiber yarns of the first carbon fiber cloth are easily broken when the first carbon fiber resin layer 10 is prepared by the first carbon fiber cloth during yarn unwinding, and a large amount of sand hair is easily present, thereby reducing the appearance of the first carbon fiber resin layer 10. If the elongation of the first carbon fiber cloth is too high, it is difficult for the first carbon fiber cloth to have a high elastic modulus, which will reduce the elastic modulus and rigidity of the first carbon fiber resin layer 10.

[0114] Optionally, the first carbon fiber cloth has a grammage ranging from 15g to 30g. Specifically, the grammage of the first carbon fiber cloth can be, but is not limited to, 15g, 18g, 20g, 23g, 25g, 28g, 30g, etc. If the grammage of the first carbon fiber cloth is too low, the stiffness of the first carbon fiber cloth and the stiffness of the first carbon fiber resin layer 10 will be reduced; if the grammage of the first carbon fiber cloth is too high, the bonding strength between the first carbon fiber cloth and the first resin will be reduced.

[0115] It should be noted that the gram weight refers to the weight per square meter of the carbon fiber cloth. For example, if the gram weight of the first carbon fiber cloth is 15g, then the weight per square meter of the first carbon fiber cloth is 15g.

[0116] Optionally, the tensile strength of the first carbon fiber cloth ranges from 4000 MPa to 6000 MPa. Specifically, the tensile strength of the first carbon fiber cloth can be, but is not limited to, 4000 MPa, 4300 MPa, 4500 MPa, 4800 MPa, 5000 MPa, 5300 MPa, 5500 MPa, 5800 MPa, 6000 MPa, etc. If the tensile strength of the first carbon fiber cloth is too low, the first carbon fiber cloth is likely to break during yarn spreading. In addition, if the tensile strength of the first carbon fiber resin layer 10 is too low, the bendable area 102 of the support member 100 is likely to have creases or break during repeated bending; if the tensile strength of the first carbon fiber cloth is too high, the bending performance of the first carbon fiber cloth is reduced.

[0117] Optionally, the thermal conductivity of the first carbon fiber cloth ranges from 100 W / m·k to 300 W / m·k. Specifically, the thermal conductivity of the first carbon fiber cloth can be, but is not limited to, 100 W / m·k, 110 W / m·k, 120 W / m·k, 130 W / m·k, 140 W / m·k, 150 W / m·k, 180 W / m·k, 200 W / m·k, 230 W / m·k, 250 W / m·k, 280 W / m·k, 300 W / m·k, etc. If the thermal conductivity of the first carbon fiber cloth is too small, the heat dissipation effect of the first carbon fiber resin layer 10 is reduced; if the thermal conductivity of the first carbon fiber cloth is too large, the cost of the first carbon fiber resin layer 10 is increased.

[0118] Optionally, the second carbon fiber cloth can be, but is not limited to, pitch-based carbon fiber cloth (with a density of about 2.2 g / cm 3 ), such as mesophase pitch-based carbon fiber cloth.

[0119] Optionally, the elastic modulus of the second carbon fiber cloth ranges from 600 GPa to 1000 GPa. Specifically, the elastic modulus of the second carbon fiber cloth can be, but is not limited to, 600 GPa, 700 GPa, 800 GPa, 900 GPa, 1000 GPa, etc. If the elastic modulus of the second carbon fiber cloth is too small, the elastic modulus and rigidity of the support portion 21 are too small, reducing the supporting effect of the support area 101 of the support member 100 on the flexible display screen and reducing the light and shadow effect of the flexible display screen; if the elastic modulus of the second carbon fiber cloth is too large, when the prepreg of the second carbon fiber cloth is made into the support portion 21 during preparation, it is not easy to spread the yarn, and the yarn spreading is likely to be uneven. In addition, the gram weight of the second carbon fiber cloth is not low, increasing the preparation cost of the support member 100.

[0120] Optionally, the elongation rate of the second carbon fiber cloth ranges from 0.2% to 1%. Specifically, the elongation rate of the second carbon fiber cloth can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. If the elongation rate of the second carbon fiber cloth is too low, the carbon fiber wires of the second carbon fiber cloth are likely to break when preparing the support part 21; if the elongation rate of the second carbon fiber cloth is too high, it is difficult for the second carbon fiber cloth to take into account a relatively high elastic modulus, which will reduce the elastic modulus and rigidity of the support part 21.

[0121] Optionally, the gram weight of the second carbon fiber cloth ranges from 60 g to 110 g. Specifically, the gram weight of the second carbon fiber cloth can be, but is not limited to, 60 g, 65 g, 70 g, 75 g, 80 g, 85 g, 90 g, 95 g, 100 g, 105 g, 110 g, etc. If the gram weight of the second carbon fiber cloth is too small, the rigidity of the second carbon fiber cloth is reduced, and the rigidity of the support part 21 is reduced; if the gram weight of the second carbon fiber cloth is too large, the bonding force between the second carbon fiber cloth and the second resin is reduced.

[0122] Optionally, the tensile strength of the second carbon fiber cloth ranges from 1500 MPa to 4500 MPa. Specifically, the tensile strength of the second carbon fiber cloth can be, but is not limited to, 1500 MPa, 1800 MPa, 2000 MPa, 2300 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3300 MPa, 3500 MPa, 3800 MPa, 4000 MPa, 4300 MPa, 4500 MPa, etc. If the tensile strength of the second carbon fiber cloth is too low, the second carbon fiber cloth is likely to break when spreading the yarn; if the tensile strength of the second carbon fiber cloth is too high, the cost of the support part 21 is increased.

[0123] Optionally, the thermal conductivity of the second carbon fiber cloth ranges from 300 W / m·k to 1000 W / m·k. Specifically, the thermal conductivity of the second carbon fiber cloth can be, but is not limited to, 300 W / m·k, 330 W / m·k, 350 W / m·k, 380 W / m·k, 400 W / m·k, 430 W / m·k, 450 W / m·k, 500 W / m·k, 600 W / m·k, 700 W / m·k, 800 W / m·k, 900 W / m·k, 1000 W / m·k, etc. If the thermal conductivity of the second carbon fiber cloth is too small, the heat dissipation effect of the support part 21 is reduced; if the thermal conductivity of the second carbon fiber cloth is too large, the cost of the support part 21 is increased.

[0124] Optionally, the third carbon fiber cloth can be at least one of, but is not limited to, T800 carbon fiber cloth, M40 carbon fiber cloth, and T700 carbon fiber cloth.

[0125] Optionally, the elastic modulus of the third carbon fiber cloth ranges from 200 GPa to 400 GPa. Specifically, the elastic modulus of the third carbon fiber cloth can be, but is not limited to, 200 GPa, 220 GPa, 240 GPa, 260 GPa, 280 GPa, 300 GPa, 320 GPa, 340 GPa, 360 GPa, 380 GPa, 400 GPa, etc. If the elastic modulus of the third carbon fiber cloth is too small, the elastic modulus and rigidity of the bendable portion 22 are too small, reducing the supporting effect of the support member 100 on the flexible display screen and reducing the light and shadow effect of the flexible display screen; if the elastic modulus of the third carbon fiber cloth is too large, the bending performance of the bendable area 102 of the support member 100 is reduced.

[0126] Optionally, the elongation rate of the third carbon fiber cloth ranges from 1.0% to 2.3%. Specifically, the elongation rate of the third carbon fiber cloth can be, but is not limited to, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, etc. If the elongation rate of the third carbon fiber cloth is too low, when the third carbon fiber cloth is used to prepare the bendable portion 22 and the carbon fiber yarn of the third carbon fiber cloth is unwound, the carbon fiber yarn of the third carbon fiber cloth is likely to break; if the elongation rate of the third carbon fiber cloth is too high, it is difficult for the third carbon fiber cloth to have a high elastic modulus, which will reduce the rigidity of the bendable portion 22, reduce the supporting effect of the bendable area 102 of the support member 100 on the flexible display screen, and increase the film printing of the bendable area 102.

[0127] Optionally, the gram weight of the third carbon fiber cloth ranges from 50 g to 100 g. Specifically, the gram weight of the third carbon fiber cloth can be, but is not limited to, 50 g, 60 g, 70 g, 80 g, 90 g, 100 g, etc. If the gram weight of the third carbon fiber cloth is too small, the stiffness of the third carbon fiber cloth is reduced, the supporting effect of the bendable area 102 of the support member 100 on the flexible display screen is reduced, and the film printing of the bendable area 102 is increased; if the gram weight of the third carbon fiber cloth is too large, the bonding force between the third carbon fiber cloth and the third resin is reduced.

[0128] Optionally, the tensile strength of the third carbon fiber cloth ranges from 4000 MPa to 6000 MPa. Specifically, the tensile strength of the third carbon fiber cloth can be, but is not limited to, 4000 MPa, 4300 MPa, 4500 MPa, 4800 MPa, 5000 MPa, 5300 MPa, 5500 MPa, 5800 MPa, 6000 MPa, etc. If the tensile strength of the third carbon fiber cloth is too low, the third carbon fiber cloth is likely to break during unwinding. In addition, if the tensile strength of the bendable portion 22 is too low, the bendable area 102 of the support member 100 is likely to have creases or break during repeated bending; if the tensile strength of the third carbon fiber cloth is too high, the bending performance of the third carbon fiber cloth is reduced.

[0129] Optionally, the thermal conductivity of the third carbon fiber cloth ranges from 100 W / m·k to 300 W / m·k. Specifically, the thermal conductivity of the third carbon fiber cloth can be, but is not limited to, 100 W / m·k, 110 W / m·k, 120 W / m·k, 130 W / m·k, 140 W / m·k, 150 W / m·k, 180 W / m·k, 200 W / m·k, 230 W / m·k, 250 W / m·k, 280 W / m·k, 300 W / m·k, etc. If the thermal conductivity of the third carbon fiber cloth is too small, the heat dissipation effect of the bendable part 22 is reduced; if the thermal conductivity of the third carbon fiber cloth is too large, the cost of the bendable part 22 is increased.

[0130] Optionally, the fourth carbon fiber cloth can be a polyacrylonitrile-based carbon fiber cloth (abbreviated as PANCF), and the polyacrylonitrile-based carbon fiber cloth can be, but is not limited to, at least one of T800 carbon fiber cloth, M40 carbon fiber cloth, and T700 carbon fiber cloth.

[0131] Optionally, the elastic modulus of the fourth carbon fiber cloth ranges from 200 GPa to 300 GPa. Specifically, the elastic modulus of the fourth carbon fiber cloth can be, but is not limited to, 200 GPa, 220 GPa, 240 GPa, 260 GPa, 280 GPa, 300 GPa, etc. If the elastic modulus of the fourth carbon fiber cloth is too small, the elastic modulus and rigidity of the third carbon fiber resin layer 30 are too small, reducing the supporting effect of the support member 100 on the flexible display screen and reducing the light and shadow effect of the flexible display screen; if the elastic modulus of the fourth carbon fiber cloth is too large, when the prepreg of the fourth carbon fiber cloth is made into the third carbon fiber resin layer 30, it is not easy to spread the yarn, the yarn is easily spread unevenly, the yarn is easily broken during the spreading process, and there are easily more yarn fuzzes, reducing the appearance effect of the first carbon fiber resin layer 10.

[0132] Optionally, the elongation of the fourth carbon fiber cloth ranges from 1.8% to 2.3%. Specifically, the elongation of the fourth carbon fiber cloth is 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, etc. If the elongation of the fourth carbon fiber cloth is too low, when the fourth carbon fiber cloth prepares the third carbon fiber resin layer 30 and the fourth carbon fiber cloth spreads the yarn, the carbon fiber wire of the fourth carbon fiber cloth is easily broken and there are easily more yarn fuzzes, reducing the appearance effect of the third carbon fiber resin layer 30; if the elongation of the fourth carbon fiber cloth is too high, it is difficult for the fourth carbon fiber cloth to have both a high elastic modulus, reducing the elastic modulus and rigidity of the third carbon fiber resin layer 30.

[0133] Optionally, the grammage of the fourth carbon fiber cloth ranges from 15 g to 30 g. Specifically, the grammage of the fourth carbon fiber cloth can be, but is not limited to, 15 g, 18 g, 20 g, 23 g, 25 g, 28 g, 30 g, etc. If the grammage of the fourth carbon fiber cloth is too small, the stiffness of the fourth carbon fiber cloth is reduced, and the stiffness of the third carbon fiber resin layer 30 is reduced; if the grammage of the fourth carbon fiber cloth is too large, the bonding force between the fourth carbon fiber cloth and the fourth resin is reduced.

[0134] Optionally, the tensile strength of the fourth carbon fiber cloth ranges from 4000 MPa to 6000 MPa. Specifically, the tensile strength of the fourth carbon fiber cloth can be, but is not limited to, 4000 MPa, 4300 MPa, 4500 MPa, 4800 MPa, 5000 MPa, 5300 MPa, 5500 MPa, 5800 MPa, 6000 MPa, etc. If the tensile strength of the fourth carbon fiber cloth is too low, the fourth carbon fiber cloth is prone to breakage during yarn spreading. In addition, if the tensile strength of the third carbon fiber resin layer 30 is too low, the bendable area 102 of the support member 100 is prone to creases or fractures during repeated bending; if the tensile strength of the fourth carbon fiber cloth is too high, the bending performance of the fourth carbon fiber cloth is reduced.

[0135] Optionally, the thermal conductivity of the fourth carbon fiber cloth ranges from 100 W / m·k to 300 W / m·k. Specifically, the thermal conductivity of the fourth carbon fiber cloth can be, but is not limited to, 100 W / m·k, 110 W / m·k, 120 W / m·k, 130 W / m·k, 140 W / m·k, 150 W / m·k, 180 W / m·k, 200 W / m·k, 230 W / m·k, 250 W / m·k, 280 W / m·k, 300 W / m·k, etc. If the thermal conductivity of the fourth carbon fiber cloth is too small, the heat dissipation effect of the third carbon fiber resin layer 30 is reduced; if the thermal conductivity of the fourth carbon fiber cloth is too large, the cost of the third carbon fiber resin layer 30 is increased.

[0136] In a specific example, both the first carbon fiber cloth and the fourth carbon fiber cloth are T700 carbon fiber cloths (that is, both the first carbon fiber resin layer 10 and the third carbon fiber resin layer 30 are T700 carbon fiber resin layers), both the first carbon fiber cloth and the fourth carbon fiber cloth extend along the second direction, the second carbon fiber cloth is a mesophase pitch-based carbon fiber cloth (that is, the support portion 21 is a mesophase pitch-based carbon fiber resin layer), the third carbon fiber cloth is an M40 carbon fiber cloth (that is, the bendable portion 22 is an M40 carbon fiber resin layer), and both the second carbon fiber cloth and the third carbon fiber cloth extend along the first direction.

[0137] In this embodiment, through the design of the materials of the first carbon fiber cloth, the second carbon fiber cloth, the third carbon fiber cloth and the fourth carbon fiber cloth, the support member 100 has good elastic moduli in both the first direction and the second direction. When applied to a flexible display screen assembly, the flexible display screen can have a better light and shadow effect. The stiffness in the second direction is higher than that of a titanium alloy TA4 plate with the same thickness, and it has a better light and shadow effect than titanium alloy. In addition, without reducing the elastic modulus and stiffness of the support member 100, the support member 100 can be made thinner. Compared with the solution of using a T700 carbon fiber resin layer / M40 carbon fiber resin layer / T700 carbon fiber resin layer (that is, both the support part 21 and the bendable part 22 are M40 carbon fiber resin layers), the support member 100 of the present application can be made thinner, and the thickness can be reduced by 0.03 mm. When applied to a foldable electronic device, for a double-foldable electronic device, after folding, the thickness can be reduced by 0.06 mm, and for an 8-inch foldable electronic device, the weight can be reduced by 1.3 g. In addition, compared with the solution where both the support part 21 and the bendable part 22 are M40 carbon fiber resin layers, the support member 100 has a better heat dissipation effect, and the heat dissipation effect can be increased by nearly one time. Furthermore, compared with the solution where both the support part 21 and the bendable part 22 are mesophase pitch-based carbon fiber resin layers, the slots on the bendable area 102 of the support member 100 can be made narrower (the width in the first direction is as low as 0.03 mm). Thus, when the support member 100 is applied to a flexible display screen assembly, the impact resistance of the flexible display screen corresponding to the bendable area 102 can be greatly improved (increased by more than 3 times), and the film printing degree of the flexible display screen corresponding to the bendable area 102 can be greatly reduced (the film printing degree is reduced by more than 40%).

[0138] Optionally, the first resin may be, but is not limited to, at least one of epoxy resin, phenolic resin, etc.

[0139] Optionally, the second resin may be, but is not limited to, at least one of epoxy resin, phenolic resin, etc.

[0140] Optionally, the third resin may be, but is not limited to, at least one of epoxy resin, phenolic resin, etc.

[0141] Optionally, the fourth resin may be, but is not limited to, at least one of epoxy resin, phenolic resin, etc.

[0142] In a specific example, the first resin, the second resin, the third resin and the fourth resin are all epoxy resins, which can make the bonding force between the first carbon fiber resin layer 10, the second carbon fiber resin layer 20 and the third carbon fiber resin layer 30 better.

[0143] In some embodiments, the stacking direction of the first carbon fiber resin layer 10, the second carbon fiber resin layer 20, and the third carbon fiber resin layer 30 is the thickness direction of the support member 100. The support member 100 extends along a plane perpendicular to the thickness direction. The extending plane of the support member 100 has a first direction and a second direction that are perpendicular to each other. The first direction is the arrangement direction of the support portion 21 and the bendable portion 22; the elastic modulus of the support member 100 along the first direction is less than the elastic modulus of the support member 100 along the second direction.

[0144] It can be understood that the elastic modulus of the support member 100 along the 0° direction (i.e., the arrangement direction of the support portion 21 and the bendable portion 22) is less than the elastic modulus of the support member 100 along the 90° direction.

[0145] When the support member 100 is applied to a foldable electronic device to support a flexible display screen, the foldable electronic device folds along the 0° direction (i.e., the first direction). The smaller elastic modulus of the support member 100 along the first direction can make the support member 100 have better bendability and is less likely to break after repeated use. In addition, the larger elastic modulus of the support member 100 along the second direction can make the support member 100 have better stiffness along the second direction, can better support the flexible display screen, so that the flexible display screen has better anti-drop performance and better light and shadow effects.

[0146] In some embodiments, the support portion 21 includes a second carbon fiber cloth and a second resin, and the second resin wraps the surface of the second carbon fiber cloth; the bendable portion 22 includes a third carbon fiber cloth and a third resin, and the third resin wraps the surface of the third carbon fiber cloth; the range of the distance between the second carbon fiber cloth and the third carbon fiber cloth is 0.2 mm to 0.4 mm.

[0147] Specifically, the distance between the second carbon fiber cloth and the third carbon fiber cloth can be, but is not limited to, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm, etc.

[0148] When preparing the support member 100, the first carbon fiber cloth is combined with the first resin (for example, impregnating the first carbon fiber cloth with the first resin adhesive and removing it for semi-curing or pre-curing) to form a first carbon fiber prepreg, the second carbon fiber cloth is combined with the second resin to form a support prepreg, the third carbon fiber cloth is combined with the third resin to form a bendable prepreg, and the fourth carbon fiber cloth is combined with the fourth resin to form a third fiber prepreg. Then, the support prepreg and the bendable prepreg are arranged at intervals on the same side of the first carbon fiber prepreg, and then the third carbon fiber prepreg is stacked on the side of the support prepreg and the bendable prepreg facing away from the first carbon fiber prepreg. Finally, hot pressing, molding pressing or autoclave molding is performed to obtain the support member 100. If the distance between the second carbon fiber cloth and the third carbon fiber cloth is too small (that is, the distance between the support prepreg and the bendable prepreg is too small), there will be a tolerance when cutting the support prepreg and the bendable prepreg, which will cause the support prepreg and the bendable prepreg to be easily overlapped when arranged on the surface of the first carbon fiber prepreg, resulting in an uneven surface, thus affecting the flatness of the surface of the obtained support member 100; if the distance between the second carbon fiber cloth and the third carbon fiber cloth is too large, when performing hot pressing, molding pressing or autoclave molding, it is difficult for the first resin, the second resin, the third resin and the fourth resin to fill the gap between the second carbon fiber cloth and the third carbon fiber cloth, thereby reducing the stiffness of the connection between the corresponding support portion 21 and the bendable portion 22 of the support member 100. When the support member 100 is applied to the flexible display screen assembly, after the flexible display screen is repeatedly bent, there is easily a film print, reducing the appearance effect of the flexible display screen.

[0149] Figure 5 It is a schematic plan view of the support member 100 according to another embodiment of the present application.

[0150] Please refer to Figure 5 , in some embodiments, the support member 100 has a slot 103 (also called a pattern), and the slot 103 sequentially penetrates through the first carbon fiber resin layer 10, the bendable portion 22 and the second carbon fiber resin layer 20; along the arrangement direction of the support portion 21 and the bendable portion 22, the width of the slot 103 ranges from 0.03 mm to 0.05 mm.

[0151] It can be understood that the slot 103 is located in the bendable area 102 of the support member 100, that is, the position of the support member 100 corresponding to the bendable portion 22.

[0152] It can be understood that the slot 103 is along the first direction (such as Figure 5 shown by the double arrow X), and the width ranges from 0.03 mm to 0.05 mm.

[0153] It can be understood that the slot 103 is along the second direction (such as Figure 5extends along the double-arrow Y, that is, the length of the slot 103 in the second direction is greater than the length of the slot 103 in the first direction.

[0154] Optionally, the number of the slots 103 is multiple, and the multiple slots 103 can be arranged in an array at the position of the support member 100 corresponding to the bendable portion 22. The multiple slots 103 can also be staggeredly arranged in the second direction. It can be understood that some of the slots 103 are arranged in the first direction, and some of the slots 103 are arranged in the second direction. It can also be understood that the multiple slots 103 are spaced apart in the first direction and the second direction in the bendable area 102 of the support member 100.

[0155] Optionally, the length of the slot 103 is 5 mm to 20 mm. Specifically, the length of the slot 103 can be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0156] Specifically, along the arrangement direction of the support portion 21 and the bendable portion 22, the width of the slot 103 can be, but is not limited to, 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm, 0.05 mm, etc. If the width of the slot 103 is too narrow along the arrangement direction of the support portion 21 and the bendable portion 22, when the support member 100 is subjected to a bending test, especially when bending at a small angle (such as R1.5), the position of the support member 100 corresponding to the slot 103 is easily broken; in addition, the processing difficulty of the slot 103 is increased. If the width of the slot 103 is too wide along the arrangement direction of the support portion 21 and the bendable portion 22, when the support member 100 is applied to the flexible display screen assembly, the drop resistance of the area of the flexible display screen corresponding to the bendable portion 22 is reduced. In addition, the film printing of the area of the flexible display screen corresponding to the bendable portion 22 is increased.

[0157] In some embodiments, the support member 100 satisfies at least one of the following conditions:

[0158] The thickness range of the first carbon fiber resin layer 10 is 15 μm to 30 μm;

[0159] The thickness range of the support portion 21 is 60 μm to 100 μm;

[0160] The thickness range of the bendable portion 22 is 60 μm to 100 μm; and

[0161] The thickness range of the third carbon fiber resin layer 30 is 15 μm to 30 μm.

[0162] Optionally, the thickness of the support portion 21 is equal to the thickness of the bendable portion 22.

[0163] Specifically, the thickness of the first carbon fiber resin layer 10 may be, but is not limited to, 15μm, 16μm, 18μm, 20μm, 22μm, 24μm, 26μm, 28μm, 30μm, etc. If the thickness of the first carbon fiber resin layer 10 is too thin, the supporting effect of the first carbon fiber resin layer 10 is reduced, and the manufacturing difficulty of the first carbon fiber resin layer 10 is increased, and the manufacturing cost of the first carbon fiber resin layer 10 is increased. If the thickness of the first carbon fiber resin layer 10 is too thick, it is not conducive to the thinning of the support member 100.

[0164] Specifically, the thickness of the support portion 21 may be, but is not limited to, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, etc. If the thickness of the support portion 21 is too thin, the supporting effect of the support portion 21 is reduced; if the thickness of the support portion 21 is too thick, it is not conducive to the thinning of the support member 100.

[0165] Specifically, the thickness of the bendable portion 22 may be, but is not limited to, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, etc. If the thickness of the bendable portion 22 is too thin, the supporting effect of the bendable portion 22 is reduced; if the thickness of the bendable portion 22 is too thick, it is not conducive to the thinning of the support member 100, and the bendability of the bendable area 102 of the support member 100 is reduced.

[0166] Specifically, the thickness of the third carbon fiber resin layer 30 may be, but is not limited to, 15μm, 16μm, 18μm, 20μm, 22μm, 24μm, 26μm, 28μm, 30μm, etc. If the thickness of the third carbon fiber resin layer 30 is too thin, the supporting effect of the third carbon fiber resin layer 30 is reduced, and the manufacturing difficulty of the third carbon fiber resin layer 30 is increased, and the manufacturing cost of the third carbon fiber resin layer 30 is increased. If the thickness of the third carbon fiber resin layer 30 is too thick, it is not conducive to the thinning of the support member 100.

[0167] Figure 6 is a schematic plan view of a flexible display screen assembly 200 according to an embodiment of the present application. Figure 7 is a flexible display screen assembly 200 according to an embodiment of the present application along Figure 6 a cross-sectional structure schematic view in the B-B direction in.

[0168] Please refer to Figure 6 and Figure 7, embodiments of the present application further provide a flexible display screen assembly 200, which includes a flexible display screen 210 and the support member 100 described in the embodiments of the present application; the flexible display screen 210 has a display surface 211; the support member 100 is disposed on a side of the flexible display screen 210 away from the display surface 211 for supporting the flexible display screen 210.

[0169] For a detailed description of other aspects of the support member 100, please refer to the description of the corresponding part of the above embodiments, which will not be repeated here.

[0170] The term "display surface 211" refers to the surface of the flexible display screen 210 for displaying contents such as texts and images.

[0171] Optionally, the flexible display screen 210 may be, but is not limited to, at least one of an organic light-emitting diode display screen (OLED display screen), a Micro-LED flexible display screen, etc. In some embodiments, the flexible display screen 210 may only have a display function. In other embodiments, the flexible display screen 210 may also integrate the display function and the touch function into one, in other words, the flexible display screen 210 is a touch flexible display screen 210.

[0172] The flexible display screen assembly 200 of the present application includes a flexible display screen 210 and a support member 100. The support member 100 includes a first carbon fiber resin layer 10, a second carbon fiber resin layer 20, and a third carbon fiber resin layer 30 that are sequentially stacked. The three film layers of the support member 100 of the present application are all carbon fiber resin layers. Carbon fiber has a relatively high elastic modulus and mechanical strength, so that the support member 100 has a relatively high stiffness and supportability, can be made thinner, and makes the support member 100 thinner and lighter. In addition, the second carbon fiber resin layer 20 of the present application includes a connected support portion 21 and a bendable portion 22. The elastic modulus of the support portion 21 is greater than the elastic modulus of the bendable portion 22. The support portion 21 has a relatively large elastic modulus, can better support the flexible display screen 210, and can make the flexible display screen 210 have a better light and shadow effect; the bendable portion 22 has a relatively small elastic modulus, so that the corresponding portion of the support member 100 at the bendable portion 22 has better bendability. The width of the slot 103 on the support member 100 corresponding to the bendable portion 22 can be made narrower, which can better improve the impact resistance of the bendable portion 22 and reduce the crease and film printing degree of the area of the flexible display screen 210 corresponding to the bendable portion 22.

[0173] Figure 8 is a schematic structural diagram of a foldable electronic device 300 in a flattened state according to an embodiment of the present application. Figure 9 is a schematic structural diagram of a foldable electronic device 300 in a folded state according to an embodiment of the present application. Figure 10It is a circuit block diagram of a foldable electronic device 300 according to an embodiment of the present application.

[0174] Please refer to Figures 8 to 10 , an embodiment of the present application further provides a foldable electronic device 300, which includes the flexible display screen assembly 200, a processor 310, and a foldable mechanism 320 described in the embodiment of the present application. The processor 310 is electrically connected to the flexible display screen 210 of the flexible display screen assembly 200 for controlling the flexible display screen 210 to display; the foldable mechanism 320 is disposed on a side of the support member 100 of the flexible display screen assembly 200 facing away from the flexible display screen 210, for carrying the flexible display screen assembly 200, and the foldable mechanism 320 is further configured to drive the foldable electronic device 300 to fold or flatten.

[0175] The foldable electronic device 300 of the present application includes a support member 100, and the support member 100 includes a first carbon fiber resin layer 10, a second carbon fiber resin layer 20, and a third carbon fiber resin layer 30 that are sequentially stacked. The three film layers of the support member 100 of the present application are all carbon fiber resin layers. Carbon fiber has a relatively high elastic modulus and mechanical strength, so that the support member 100 has a relatively high stiffness and supportability, and can be made thinner, making the support member 100 thinner and lighter. In addition, the second carbon fiber resin layer 20 of the present application includes a connected support portion 21 and a bendable portion 22. The elastic modulus of the support portion 21 is greater than that of the bendable portion 22. The support portion 21 has a relatively large elastic modulus, which can better support the flexible display screen 210 and enable the flexible display screen 210 to have a better light and shadow effect; the bendable portion 22 has a relatively small elastic modulus, so that the portion of the support member 100 corresponding to the bendable portion 22 has better bendability. The width of the slot 103 on the support member 100 corresponding to the bendable portion 22 can be made narrower, which can better improve the impact resistance of the bendable portion 22 and reduce the crease and film printing degree of the area of the flexible display screen 210 corresponding to the bendable portion 22.

[0176] The foldable electronic device 300 of the embodiment of the present application includes at least one of a foldable mobile phone, a foldable tablet computer, a foldable e-reader, a foldable notebook computer, etc.

[0177] It can be understood that the foldable mechanism 320, the support member 100, and the flexible display screen 210 are sequentially stacked.

[0178] For a detailed description of other aspects of the flexible display screen assembly 200, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0179] In some embodiments, the foldable mechanism 320 includes a first middle frame 321, a rotating shaft 322, and a second middle frame 323 that are sequentially movably connected; the first middle frame 321 and the second middle frame 323 can respectively rotate relative to the rotating shaft 322 in directions approaching or moving away from each other, and the first middle frame 321, the rotating shaft 322, and the second middle frame 323 cooperate with each other to carry the flexible display screen assembly 200; the foldable mechanism 320 has a flattened state (such as Figure 8 as shown) and a folded state (such as Figure 9 as shown). When the foldable mechanism 320 is in the flattened state, the first middle frame 321, the rotating shaft 322, and the second middle frame 323 form a planar structure to drive the bendable area 102 of the support member 100 to be in a flat state; when the foldable mechanism 320 is in the folded state, the first middle frame 321 and the second middle frame 323 overlap and drive the bendable area 102 of the support member 100 to be in a bent state.

[0180] It should be noted that the flexible display screen assembly 200 covers the first middle frame 321, the rotating shaft 322, and the second middle frame 323. When the foldable mechanism 320 is in the flattened state, the flexible display screen assembly 200 is in a planar state; when the foldable mechanism 320 is in the folded state, the flexible display screen assembly 200 is bent and partially overlapped (such as bent into a U-shaped structure).

[0181] It should be noted that the foldable electronic device 300 in the embodiments of the present application can be an inward-foldable electronic device 300 (that is, when the foldable mechanism 320 is in the folded state, the flexible display screen 210 is located inside or in the middle), or an outward-foldable electronic device 300 (that is, when the foldable mechanism 320 is in the folded state, the flexible display screen 210 is located outside).

[0182] Optionally, the processor 310 includes one or more general-purpose processors. Among them, the general-purpose processor can be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, and an ASIC, etc. The processor 310 is used to execute various types of digital storage instructions, such as software or firmware programs stored in the memory 330, and it can enable the computing device to provide a wide variety of services.

[0183] In some embodiments, the foldable electronic device 300 in the embodiments of the present application further includes a memory 330. The memory 330 is electrically connected to the processor 310. Under the control of the processor 310, the memory 330 is used to store the program code required for the operation of the processor 310, the program code required for controlling the flexible display screen assembly 200, the display content of the flexible display screen assembly 200, etc.

[0184] Optionally, the memory 330 may include a volatile memory, such as a random access memory (RAM); the memory 330 may also include a non-volatile memory 330, such as a read-only memory (ROM), a flash memory (FM), a hard disk drive (HDD), or a solid-state drive (SSD). The memory 330 may also include a combination of the above types of memories 330.

[0185] In some embodiments, the foldable electronic device 300 of the present application embodiment further includes a camera module 340, which is electrically connected to the processor 310 and is used for taking pictures under the control of the processor 310. Optionally, the camera module 340 may be at least one of a front camera module and a rear camera module.

[0186] Optionally, when the camera module 340 is a rear camera module, a light-transmitting portion (not shown in the figure) is provided on the first middle frame 321 or the second middle frame 323 of the foldable mechanism 320, and the camera module 340 takes pictures through the light-transmitting portion. The light-transmitting portion may be an opening or a solid portion, and the solid portion may be, but is not limited to, a light-transmitting resin portion, a light-transmitting glass portion, etc.

[0187] The support member 100 and the flexible display screen assembly 200 of the embodiments of the present application are further described below through specific embodiments.

[0188] Embodiment 1

[0189] The support member 100 of the embodiment of the present application includes a first carbon fiber resin layer 10, a second carbon fiber resin layer 20, and a third carbon fiber resin layer 30 that are sequentially stacked; the second carbon fiber resin layer 20 includes a connected support portion 21 and a bendable portion 22;

[0190] The first carbon fiber resin layer 10 includes a first carbon fiber cloth and a first resin. The first carbon fiber cloth is a T700 carbon fiber cloth. The thickness of the first carbon fiber resin layer 10 is 20 μm, and the gram weight of the first carbon fiber cloth is 20 g; the first resin is an epoxy resin; the density of the first carbon fiber cloth is 1.8 g / cm 3 , the tensile strength is 4900 MPa, the elastic modulus is 230 GPa, the elongation rate is 2.1%, the first carbon fiber cloth includes first carbon fiber lines, and the first carbon fiber lines extend along the 0° direction (i.e., the arrangement direction of the support portion 21 and the bendable portion 22);

[0191] The support part 21 includes a second carbon fiber cloth and a second resin. The second carbon fiber cloth is a mesophase pitch-based carbon fiber cloth with a thickness of 80 μm and a grammage of 90 g. The second resin is an epoxy resin. The density of the second carbon fiber cloth is 2.2 g / cm 3 , the tensile strength is 2400 MPa, the elastic modulus is 800 GPa, the elongation is 0.26%, and the thermal conductivity is 800 W / m·k. The second carbon fiber cloth includes second carbon fiber threads, and the second carbon fiber threads extend in the 90° direction (i.e., perpendicular to the arrangement direction of the support part 21 and the bendable part 22);

[0192] The bendable part 22 includes a third carbon fiber cloth and a third resin. The third carbon fiber cloth is an M40 carbon fiber cloth with a thickness of 80 μm and a grammage of 80 g. The third resin is an epoxy resin. The density of the third carbon fiber cloth is 1.8 g / cm 3 , the tensile strength is 4400 MPa, the elastic modulus is 377 GPa, the elongation is 1.2%, and the thermal conductivity is 300 W / m·k. The third carbon fiber cloth includes third carbon fiber threads, and the third carbon fiber threads extend in the 90° direction (i.e., perpendicular to the arrangement direction of the support part 21 and the bendable part 22);

[0193] The third carbon fiber resin layer 30 includes a fourth carbon fiber cloth and a fourth resin. The fourth carbon fiber cloth is a T700 carbon fiber cloth, and the thickness of the fourth carbon fiber resin layer is 20 μm and the grammage of the fourth carbon fiber cloth is 20 g. The fourth resin is an epoxy resin. The density of the fourth carbon fiber cloth is 1.8 g / cm 3 , the tensile strength is 4900 MPa, the elastic modulus is 230 GPa, and the elongation is 2.1%. The fourth carbon fiber cloth includes fourth carbon fiber threads, and the fourth carbon fiber threads extend in the 0° direction (i.e., the arrangement direction of the support part 21 and the bendable part 22);

[0194] The thickness of the support member 100 is 120 μm. At the position corresponding to the bendable part 22 of the support member 100, a plurality of slotted openings 103 are provided that penetrate through the first carbon fiber resin layer 10, the bendable part 22, and the third carbon fiber resin layer 30 and are spaced apart. The width of the slotted opening 103 in the 0° direction is 0.04 mm, and the length of the slotted opening 103 in the 90° direction is 10 mm.

[0195] Comparative Example 1

[0196] The difference between this comparative example and Example 1 is as follows: The entire second carbon fiber resin layer 20 is an M40 carbon fiber resin layer. The M40 carbon fiber resin layer includes M40 carbon fiber cloth and epoxy resin. The gram weight of the M40 carbon fiber cloth is 100 g. The M40 carbon fiber threads extend in the 90° direction. The thickness of the second carbon fiber resin layer 20 is 100 μm. The gram weight of the T700 carbon fiber cloth is 25 g. The thicknesses of the first carbon fiber resin layer 10 and the third fiber resin layer are both 25 μm. The T700 carbon fiber threads extend in the 0° direction.

[0197] The thickness of the support member 100 is 150 μm.

[0198] Comparative Example 2

[0199] The difference between this comparative example and Example 1 is as follows: The entire second carbon fiber resin layer 20 is a mesophase pitch-based carbon fiber resin layer. The mesophase pitch-based carbon fiber threads extend in the 90° direction. The thickness of the support member 100 is 120 μm. At the position of the support member 100 corresponding to the bendable portion 22, there are a plurality of slotted openings 103 that penetrate through the first carbon fiber resin layer 10, the bendable portion 22, and the third carbon fiber resin layer 30 and are spaced apart. The width of the slotted opening 103 in the 0° direction is 0.15 mm, and the length of the slotted opening 103 in the 90° direction is 10 mm.

[0200] Comparative Example 3

[0201] The difference between this comparative example and Example 1 is as follows: The entire second carbon fiber resin layer 20 is a mesophase pitch-based carbon fiber resin layer. The mesophase pitch-based carbon fiber threads extend in the 90° direction. The thickness of the support member 100 is 120 μm. At the position of the support member 100 corresponding to the bendable portion 22, there are a plurality of slotted openings 103 that penetrate through the first carbon fiber resin layer 10, the bendable portion 22, and the third carbon fiber resin layer 30 and are spaced apart. The width of the slotted opening 103 in the 0° direction is 0.04 mm, and the length of the slotted opening 103 in the 90° direction is 10 mm.

[0202] Comparative Example 4

[0203] The difference between this comparative example and Example 1 is as follows: A stainless steel plate SUS316 with a thickness of 120 μm is used as the support member 100. The density of stainless steel is 7.9 g / cm 3 .

[0204] Comparative Example 5

[0205] The difference between this comparative example and Example 1 is as follows: A titanium alloy TA4 plate with a thickness of 120 μm is used as the support member 100. The density of the titanium alloy is 2.8 g / cm 3 .

[0206] Perform performance tests on the support members 100 of the above embodiments and comparative examples, and the test results are shown in Table 1 below.

[0207] (1) Elastic modulus of the support member 100: Tested according to GB / T 1447-2005.

[0208] (2) Stiffness test: Stiffness = the cube of the thickness of the support member 100 × the elastic modulus of the support member 100.

[0209] (3) Elongation test: Tested according to GB / T 1447-2005.

[0210] (4) Tensile strength test: Tested according to GB / T 1447-2005.

[0211] (5) Thermal conductivity: The thermal conductivity is tested according to GB / T 3139-2005.

[0212] (6) Bending test of the flexible display screen assembly 200: Assemble the support members 100 of the embodiments and comparative examples with the flexible display screen 210 into the flexible display screen assembly 200. Place the flexible display screen assembly 200 on a bending test machine, with a bending radius of 1.5 mm, and perform 10,000 (w) bends. Observe the crease situation of the flexible display screen 210 of the flexible display screen assemblies 200 of the embodiments and comparative examples.

[0213] Table 1 Performance parameters of the support members 100 of the embodiments and comparative examples

[0214]

[0215] The support member 100 in Comparative Example 1 has the entire second carbon fiber resin layer 20 as an M40 carbon fiber resin layer. In the support member 100 of Example 1 of the present application, the bendable region 102 of the second carbon fiber resin layer 20 is an M40 carbon fiber resin layer, and the support region 101 is a mesophase pitch-based carbon fiber resin layer. From the test results of Example 1 and Comparative Example 1 in Table 1, it can be seen that compared with the support member 100 of Comparative Example 1, the support member 100 of Example 1 of the present application has a higher elastic modulus. At a relatively thin thickness, it can also have a higher stiffness, so it can be made thinner, and thus can be made more lightweight and thinner. When applied to the flexible display screen assembly 200 and the foldable electronic device 300, it can make the flexible display screen assembly 200 and the foldable electronic device 300 more lightweight and thinner. The stiffness of the support member 100 in Example 1 of the present application when the thickness is reduced to 120 μm is equivalent to that of the support member 100 with a thickness of 150 μm in Comparative Example 1, and the support member 100 in Example 1 of the present application still maintains a high elongation rate. In addition, compared with the support member 100 of Comparative Example 1, the support member 100 of the present embodiment has a higher thermal conductivity coefficient, so it can better dissipate heat for the foldable electronic device 300 and improve the heat dissipation effect.

[0216] Figure 11 It is a photo of the support member 100 of Example 1 assembled on the flexible display screen assembly 200 after 10,000 bending tests. Figure 12 It is a photo of the support member 100 of Comparative Example 2 assembled on the flexible display screen assembly 200 after 10,000 bending tests. Figure 11 The creases and film prints that appear on the flexible display screen assembly 200 are not obvious, only slight film prints, which indicates that the flexible display screen assembly 200 composed of the support member 100 of Example 1 is less likely to have creases and has a smaller degree of film prints. The width of the slot 103 of the support member 100 in Comparative Example 2 is larger than that in Example 1. From Figure 12 it can be seen that obvious creases and film prints appear on the flexible display screen assembly 200, which indicates that the support member 100 of Comparative Example 2 has a weak supporting effect on the flexible display screen 210 and is more likely to have creases and film prints. The width of the slot 103 of the support member 100 in Comparative Example 3 is equal to that in Example 1. After testing, when the flexible display screen assembly 200 composed of the support member 100 in Comparative Example 3 is bent, the support member 100 cracks, which indicates that the bendable performance of the support member in Comparative Example 3 is poor, the bending radius is large, which is not conducive to reducing the thickness of the foldable electronic device 300 after folding. In addition, the bending life of the foldable electronic device 300 is reduced.

[0217] As can be seen from the test results of Example 1 and Comparative Example 2 in Table 1, compared with the support member 100 of Comparative Example 2, the support member 100 of Example 1 of the present application has a higher elongation rate in the 0° direction, so that the support member 100 has better bendability. When applied to the flexible display assembly 200 and the foldable electronic device 300, it can withstand more bending times and smaller bending radii, and can better improve the service life of the foldable electronic device 300. In addition, compared with the support member 100 of Comparative Example 2, the support member 100 of Example 1 of the present application has a higher tensile strength in the 0° direction.

[0218] As can be seen from the test results of Example 1, Comparative Example 4 and Comparative Example 5 in Table 1, the support member 100 of Example 1 has relatively high elastic modulus and stiffness, and its elastic modulus and stiffness are comparable to those of the support member 100 made of titanium alloy in Comparative Example 5. The support member 100 of Example 1 is prepared by using a carbon fiber resin layer, and its density is lower than that of stainless steel and titanium alloy. Especially compared with the support member 100 made of stainless steel in Comparative Example 4, the density is greatly reduced, and it is lighter in weight under the same thickness, which is beneficial to reducing the weight of the foldable electronic device 300. In addition, compared with the support members 100 of Comparative Example 4 and Comparative Example 5, the support member 100 of Example 1 of the present application has a higher thermal conductivity coefficient, so that it can better dissipate heat for the foldable electronic device 300, improve the heat dissipation effect, avoid local overheating of the foldable electronic device 300, and prevent the foldable electronic device 300 from running smoothly or getting stuck, etc., and improve the user experience.

[0219] In the present application, the mention of "embodiment" and "implementation manner" means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of the above phrases at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in each embodiment of the present application can be combined arbitrarily without conflict with each other to form another embodiment that does not depart from the spirit and scope of the technical solution of the present application.

[0220] Finally, it should be noted that the above implementation manners are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred implementation manners, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A support member, characterized in that, The support member includes a first carbon fiber resin layer, a second carbon fiber resin layer, and a third carbon fiber resin layer that are sequentially stacked; the second carbon fiber resin layer includes a connected support portion and a bendable portion, and the elastic modulus of the support portion is greater than that of the bendable portion.

2. The support member according to claim 1, wherein The elongation rate of the bendable portion is greater than that of the support portion.

3. The support member according to claim 1, characterized in that, The tensile strength of the bendable portion is greater than that of the support portion.

4. The support member according to claim 1, wherein, The thermal conductivity coefficient of the support portion is greater than that of the bendable portion.

5. The support member according to claim 1, characterized in that, The second carbon fiber resin layer satisfies at least one of the following conditions: The range of the elastic modulus of the support portion is 300 GPa to 600 GPa; The range of the elongation rate of the support portion is 0.2% to 1%; The range of the tensile strength of the support portion is 1500 MPa to 4500 MPa; The range of the thermal conductivity coefficient of the support portion is 100 W / m·k to 450 W / m·k; The range of the elastic modulus of the bendable portion is 50 GPa to 300 GPa; The range of the elongation rate of the bendable portion is 1% to 2.3%; The range of the tensile strength of the bendable portion is 4000 MPa to 6000 MPa; and The range of the thermal conductivity coefficient of the bendable portion is 50 W / m·k to 150 W / m·k.

6. The support according to claim 1, wherein The elastic modulus of the first carbon fiber resin layer is less than that of the bendable portion; the elastic modulus of the third carbon fiber resin layer is less than that of the bendable portion.

7. The support member according to claim 1, characterized in that, The elongation rate of the first carbon fiber resin layer is greater than that of the bendable portion; the elongation rate of the third carbon fiber resin layer is greater than that of the bendable portion.

8. The support member according to claim 1, wherein The first carbon fiber resin layer satisfies at least one of the following conditions: The range of the elastic modulus of the first carbon fiber resin layer is 50 GPa to 200 GPa; The range of the elongation rate of the first carbon fiber resin layer is 1.8% to 2.3%; The range of the tensile strength of the first carbon fiber resin layer is 4000 MPa to 6000 MPa; And The range of the thermal conductivity coefficient of the first carbon fiber resin layer is 50 W / m·k to 150 W / m·k; The third carbon fiber resin layer satisfies at least one of the following conditions: The range of the elastic modulus of the third carbon fiber resin layer is 50 GPa to 200 GPa; The range of the elongation rate of the third carbon fiber resin layer is 1.8% to 2.3%; The range of the tensile strength of the third carbon fiber resin layer is 4000 MPa to 6000 MPa; And The range of the thermal conductivity coefficient of the third carbon fiber resin layer is 50 W / m·k to 150 W / m·k.

9. The support member according to claim 1, characterized in that, The stacking direction of the first carbon fiber resin layer, the second carbon fiber resin layer, and the third carbon fiber resin layer is the thickness direction of the support member, the support member extends along a plane perpendicular to the thickness direction, and the extension plane of the support member has a first direction and a second direction that are perpendicular to each other, and the first direction is the arrangement direction of the support portion and the bendable portion; The first carbon fiber resin layer includes a first carbon fiber cloth and a first resin, the first resin wrapping a surface of the first carbon fiber cloth, the first carbon fiber cloth including first carbon fiber yarns, and an angle between an extending direction of the first carbon fiber yarn and the first direction is in a range of 0° to 5°; The support portion includes a second carbon fiber cloth and a second resin, the second resin wraps the surface of the second carbon fiber cloth, the second carbon fiber cloth includes second carbon fiber yarns, and the angle between the extending direction of the second carbon fiber yarns and the first direction is in a range of 85° to 95°; The bendable portion includes a third carbon fiber cloth and a third resin, the third resin wraps the surface of the third carbon fiber cloth, the third carbon fiber cloth includes third carbon fiber yarns, and the angle between the extending direction of the third carbon fiber yarns and the first direction is in a range of 85° to 95°; The third carbon fiber resin layer includes a fourth carbon fiber cloth and a fourth resin, the fourth resin wraps the surface of the fourth carbon fiber cloth, the fourth carbon fiber cloth includes a fourth carbon fiber line, and the angle between the extension direction of the fourth carbon fiber line and the first direction ranges from 0° to 5°.

10. The support member according to claim 1, wherein, The stacking direction of the first carbon fiber resin layer, the second carbon fiber resin layer and the third carbon fiber resin layer is the thickness direction of the support member, the support member extends along a plane perpendicular to the thickness direction, the extension plane of the support member has a first direction and a second direction perpendicular to each other, the first direction is the arrangement direction of the support portion and the bendable portion; the elastic modulus of the support member along the first direction is less than the elastic modulus of the support member along the second direction.

11. The support member according to claim 1, characterized in that, The supporting portion includes a second carbon fiber cloth and a second resin, and the second resin wraps the surface of the second carbon fiber cloth; the bendable portion includes a third carbon fiber cloth and a third resin, and the third resin wraps the surface of the third carbon fiber cloth; the spacing between the second carbon fiber cloth and the third carbon fiber cloth ranges from 0.2 mm to 0.4 mm.

12. The support member according to claim 1, characterized in that, The support member has a slot, which passes through the first carbon fiber resin layer, the bendable portion and the second carbon fiber resin layer in sequence; along the arrangement direction of the support portion and the bendable portion, the width of the slot ranges from 0.03mm to 0.05mm.

13. The support member according to any one of claims 1-12, characterized in that, The support member satisfies at least one of the following conditions: The thickness of the first carbon fiber resin layer is in a range of 15 μm to 30 μm; The thickness of the support portion ranges from 60 μm to 100 μm; The thickness of the bendable portion ranges from 60 μm to 100 μm; as well as The third carbon fiber resin layer has a thickness ranging from 15 μm to 30 μm.

14. A flexible display screen assembly, characterized in that, include: A flexible display screen having a display surface; as well as The support member according to any one of claims 1 to 13 is arranged on a side of the flexible display screen facing away from the display surface, and is used to support the flexible display screen.

15. A foldable electronic device, characterized in that, include: The flexible display screen assembly according to claim 14; as well as a processor, the processor being electrically connected to the flexible display screen of the flexible display screen assembly and configured to control the flexible display screen to perform display; A foldable mechanism is arranged on the side of the support member of the flexible display screen assembly facing away from the flexible display screen, and is used to support the flexible display screen assembly. The foldable mechanism is also used to drive the foldable electronic device to fold or flatten.

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