Composite board, shell, display module and electronic equipment

Abstract

The invention relates to the technical field of electronic equipment, in particular to a composite board, a shell, a display module and electronic equipment. The composite board comprises a carbon fiber resin composite layer and a light layer, the number of the carbon fiber resin composite layers is multiple, the multiple carbon fiber resin composite layers and the light layer are arranged in a stacked mode, and the light layer is located between any two carbon fiber resin composite layers; the density of the two carbon fiber resin composite layers on the outermost side of the composite board is larger than that of the light layer. The composite board is small in density and light in weight, and weight reduction of electronic equipment can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic equipment, and in particular to a composite board, a shell display module and an electronic equipment. Background Art

[0002] The weight reduction of electronic devices is a major research hotspot, especially flexible electronic devices. Since they can meet the requirements of deformation such as bending and folding, the demand for them is growing and the market prospects are good. However, their heavy weight restricts their further development and popularization. Summary of the invention

[0003] Based on this, the present invention provides a composite board, a housing, a display module and an electronic device to improve the problem of heavy weight of the electronic device.

[0004] The first aspect of the present invention provides a composite board, and its technical solution is as follows:

[0005] A composite panel comprising a carbon fiber resin composite layer and a lightweight layer;

[0006] The carbon fiber resin composite layer has multiple layers, the multiple carbon fiber resin composite layers and the light layer are stacked, and the light layer is located between any two carbon fiber resin composite layers;

[0007] The density of the two outermost carbon fiber resin composite layers of the composite plate is greater than the density of the lightweight layer.

[0008] A second aspect of the present invention provides a display module, which includes a flexible display screen and the above-mentioned composite board, wherein the composite board and the flexible display screen are stacked.

[0009] A third aspect of the present invention provides a housing comprising the composite plate.

[0010] A fourth aspect of the present invention provides an electronic device, comprising a housing and a display module disposed on the housing;

[0011] The display module is as described above; and / or the shell is as described above.

[0012] Compared with the traditional solution, the present invention has the following beneficial effects:

[0013] The composite board of the present invention has multiple layers of carbon fiber resin composite layers. Compared with traditional metal layers, the use of multiple layers of carbon fiber resin composite layers can achieve the effect of weight reduction. At the same time, the inventors have found through research that when the composite board with multiple layers of carbon fiber resin composite layers is bent and stressed in the thickness direction, the outer carbon fiber resin composite layer is subjected to greater stress, while the inner carbon fiber resin composite layer is subjected to less stress. Based on this discovery, the inventors tried to use a lighter layer with a lower density as the inner layer of the composite board, and obtained a composite board with a lighter weight and less sacrifice in bending strength and bending modulus. The weight of the composite board was reduced without affecting the mechanical properties of the composite board on a large scale, thereby achieving weight reduction of electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention and to more completely understand the present invention and its beneficial effects, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0015] Figure 1 is a schematic structural diagram of the composite plate of Example 1;

[0016] Figure 2 is a schematic diagram of the structure of the composite plate of Example 2;

[0017] Figure 3 It is a schematic diagram of the structure of the composite plate of Comparative Example 1;

[0018] Figure 4 Schematic diagram of the structure of the composite plate of Comparative Example 2. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with specific embodiments. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] the term

[0022] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0023] In the present invention, the selection range involving "and / or", "or / and", and "and / or" includes any one of two or more related listed items, and also includes any and all combinations of related listed items, and the arbitrary and all combinations include any combination of two related listed items, any more related listed items, or all related listed items. It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that the technical solution undoubtedly includes technical solutions that are all connected by "logical and", and undoubtedly includes technical solutions that are all connected by "logical or". For example, "A and / or B" includes three parallel solutions of A, B and A+B. For example, the technical solution of "A, and / or, B, and / or, C, and / or, D" includes any one of A, B, C, and D (that is, the technical solution that is all connected by "logical OR"), and also includes any and all combinations of A, B, C, and D, that is, the combination of any two or any three of A, B, C, and D, and also includes the combination of four of A, B, C, and D (that is, the technical solution that is all connected by "logical AND").

[0024] In the present invention, "plurality", "multiple", "multiple strips", "multiple layers", etc., unless otherwise specified, refer to a number greater than or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0025] In the present invention, "optionally", "optional" and "optional" refer to optional, that is, to any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0026] In the present invention, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0027] In the present invention, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval, and includes the two numerical endpoints (i.e., the minimum value and the maximum value) of the numerical range, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints. In this article, it is equivalent to directly listing each integer, such as t is an integer selected from 1 to 10, indicating that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all sub-ranges included therein.

[0028] A first aspect of the present invention provides a composite plate. In one embodiment, the composite plate includes a carbon fiber resin composite layer and a light layer. The carbon fiber resin composite layer has multiple layers. The multiple carbon fiber resin composite layers and the light layer are stacked, and the light layer is located between any two carbon fiber resin composite layers.

[0029] The densities of the two outermost carbon fiber resin composite layers of the composite plate are both greater than the density of the lightweight layer.

[0030] The composite board of this embodiment has multiple layers of carbon fiber resin composite layers. Compared with the traditional metal layer, the use of multiple layers of carbon fiber resin composite layers can achieve the effect of weight reduction. At the same time, the inventors have found through research that when the composite board with multiple layers of carbon fiber resin composite layers is bent and stressed in the thickness direction, the outer carbon fiber resin composite layer is subjected to greater stress, while the inner carbon fiber resin composite layer is subjected to less stress. Based on this discovery, the inventors tried to use a lighter layer with a lower density as the inner layer of the composite board, and obtained a composite board with a lighter weight and less sacrifice in bending strength and bending modulus. The weight of the composite board was reduced without affecting the mechanical properties of the composite board on a large scale, thereby achieving weight reduction of electronic equipment.

[0031] It can be understood that the composite plate is subjected to stress when being bent in the thickness direction, which may be stress that occurs when an electronic device is dropped, or stress that occurs when a flexible electronic device is bent.

[0032] It can be understood that the number of carbon fiber resin composite layers is at least two. At this time, a lightweight layer is sandwiched inside the composite panel by at least two carbon fiber resin composite layers to reduce the weight of the composite panel with less sacrifice in the bending strength and bending modulus of the composite panel.

[0033] It can be understood that the lightweight layer is located between any two carbon fiber resin composite layers, and there is one carbon fiber resin composite layer as the outermost layer on one side of the composite board, and another carbon fiber resin composite layer as the outermost layer on the other side of the composite board. The two outermost carbon fiber resin composite layers of the composite board refer to the two outermost carbon fiber resin composite layers on both sides of the composite board.

[0034] See also Figure 1 In Example 1, the composite panel 01 includes a carbon fiber resin composite layer 11, a lightweight layer 10 and a carbon fiber resin composite layer 12 stacked in sequence, and the density of the lightweight layer 10 is less than the density of the carbon fiber resin composite layer 11, and less than the density of the carbon fiber resin composite layer 12.

[0035] In other examples, the number of layers of the carbon fiber resin composite layer can also be more layers, for example, the number of layers of the carbon fiber resin composite layer includes but is not limited to three layers, four layers, five layers, six layers, seven layers, eight layers, nine layers, ten layers, eleven layers, twelve layers, thirteen layers, fourteen layers, twenty layers, etc. The number of layers of the carbon fiber resin composite layer can be designed according to actual needs.

[0036] Optionally, the density of each of the carbon fiber resin composite layers is greater than the density of the lightweight layer.

[0037] See also Figure 2 In Example 2, the composite panel 02 includes a carbon fiber resin composite layer 21, a carbon fiber resin composite layer 22, a lightweight layer 20, a carbon fiber resin composite layer 23 and a carbon fiber resin composite layer 24 stacked in sequence, and the density of the lightweight layer 20 is less than the density of the carbon fiber resin composite layer 21, less than the density of the carbon fiber resin composite layer 22, less than the density of the carbon fiber resin composite layer 23, and less than the density of the carbon fiber resin composite layer 24.

[0038] The carbon fiber resin composite layer has a coupled deformation phenomenon. Optionally, the number of layers of the light layer is one layer, and the number of layers of the carbon fiber resin composite layer on both sides of the light layer is the same. In this case, the stress in the subsequent molding process can be balanced to offset the coupled deformation after molding.

[0039] Optionally, the carbon fiber resin composite layers on both sides of the lightweight layer are symmetrically arranged, so that the stress generated by the curing of the resin under the asymmetrical arrangement during subsequent molding can be reduced, and the warping problem of the composite plate can be prevented.

[0040] It can be understood that the symmetrical arrangement of the carbon fiber resin composite layers on both sides of the lightweight layer means that along the thickness direction, starting from the two side surfaces of the lightweight layer, and pointing in two directions of the outer surface of the composite plate respectively, the corresponding two layers of carbon fiber resin composite layers have the same material and thickness, and the corresponding two layers of carbon fiber resin composite layers have the same carbon fiber arrangement.

[0041] In Example 1, the number of lightweight layers is one layer, and the one lightweight layer is sandwiched by two layers of carbon fiber resin composite layers inside the composite board, and the carbon fiber resin composite layers on both sides of the lightweight layer are symmetrically arranged. In Example 2, the number of lightweight layers is one layer, and the one lightweight layer is sandwiched by four layers of carbon fiber resin composite layers inside the composite board, and the carbon fiber resin composite layers on both sides of the lightweight layer are symmetrically arranged. In other examples, the number of lightweight layers is one layer, and the one lightweight layer is sandwiched by other numbers of carbon fiber resin composite layers inside the composite board. In other examples, the number of lightweight layers can also be multiple layers, and multiple lightweight layers are sandwiched by multiple layers of carbon fiber resin composite layers inside the composite board.

[0042] The density of the light layer is less than the density of the two outermost carbon fiber resin composite layers of the composite board. Under the same volume, the weight can be reduced. The material of the light layer can be selected according to the material of the carbon fiber resin composite layer and the above density requirements.

[0043] Generally speaking, the density of carbon fiber is about 1.6g / cm 3 The density of the carbon fiber resin composite layer is 1.6g / cm 3 Nearby, depends on the arrangement of carbon fibers and the type of resin in the carbon fiber resin composite layer.

[0044] Optionally, each carbon fiber resin composite layer independently includes a third resin layer and a carbon fiber mesh or carbon fiber strips dispersed in the third resin layer.

[0045] Optionally, the material of the third resin layer is selected from one or more of epoxy resin, bismaleimide resin, polyimide resin, phenolic resin, polytetrafluoroethylene resin, polycarbonate resin, polyurethane resin, polyetheretherketone resin, polyetherimide resin and polyamide resin.

[0046] In some examples, each carbon fiber resin composite layer includes a third resin layer and a carbon fiber mesh dispersed in the third resin layer. Figure 1 In the illustrated example 1, the carbon fiber resin composite layer 11 includes a third resin layer and a carbon fiber mesh dispersed in the third resin layer, and the carbon fiber resin composite layer 12 includes a third resin layer and a carbon fiber mesh dispersed in the third resin layer.

[0047] In some examples, each carbon fiber resin composite layer includes a third resin layer and carbon fiber strips dispersed in the third resin layer. Optionally, there are a plurality of carbon fiber strips, and the plurality of carbon fibers are placed side by side.

[0048] Optionally, the carbon fiber resin composite layer includes a third resin layer and carbon fiber strips dispersed in the third resin layer, and the number of layers of the carbon fiber composite layer in which the carbon fiber strips are dispersed is at least two.

[0049] Optionally, the lightweight layer has one layer, and the composite panel includes a first carbon fiber resin composite layer and a second carbon fiber resin composite layer that are adjacent and located on the same side of the lightweight layer;

[0050] The first carbon fiber resin composite layer includes a third resin layer and first carbon fiber strips dispersed in the third resin layer, the number of the first carbon fiber strips is multiple, and the multiple first carbon fiber strips are placed side by side;

[0051] The second carbon fiber resin composite layer includes a third resin layer and second carbon fiber strips dispersed in the third resin layer, the number of the second carbon fiber strips is multiple, and the multiple second carbon fiber strips are placed side by side;

[0052] An extending direction of the first carbon fiber strips is perpendicular to an extending direction of the second carbon fiber strips.

[0053] The first carbon fiber resin composite layer and the second carbon fiber resin composite layer are stacked and arranged adjacent to each other, which is beneficial to ensuring uniform stress.

[0054] Considering that the number of carbon fiber resin composite layers on both sides of the lightweight layer is the same, and further considering that the carbon fiber resin layers on both sides of the lightweight layer are symmetrically arranged, the number of carbon fiber composite layers with dispersed carbon fiber strips is at least four.

[0055] Optionally, the composite plate further comprises a third carbon fiber resin composite layer and a fourth carbon fiber resin composite layer adjacent to and located on the same side of the lightweight layer, wherein the third carbon fiber resin composite layer is symmetrical to the second carbon fiber resin composite layer, and the fourth carbon fiber resin composite layer is symmetrical to the first carbon fiber resin composite layer. Figure 2 In the example 2 shown, the carbon fiber resin composite layer 21 includes a third resin layer and carbon fiber strips dispersed in the third resin layer, and the number of carbon fiber strips is multiple and the multiple carbon fiber strips are placed side by side. The carbon fiber resin composite layer 22 includes a third resin layer and carbon fiber strips dispersed in the third resin layer, and the number of carbon fiber strips is multiple and the multiple carbon fiber strips are placed side by side. The extension direction of the carbon fiber strips in the carbon fiber resin composite layer 21 is perpendicular to the extension direction of the carbon fiber strips in the carbon fiber resin composite layer 22. The carbon fiber resin composite layer 23 is symmetrical with the carbon fiber resin composite layer 22, and the carbon fiber resin composite layer 24 is symmetrical with the carbon fiber resin composite layer 21.

[0056] In some examples, a portion of the carbon fiber resin composite layer includes a third resin layer and carbon fiber strips dispersed in the third resin layer, and another portion of the carbon fiber resin composite layer includes a third resin layer and a carbon fiber mesh dispersed in the third resin layer.

[0057] When the material of the third resin layer is epoxy resin, the carbon fiber resin composite layer includes the epoxy resin layer and carbon fiber strips dispersed in the epoxy resin layer. At this time, the density of the carbon fiber resin composite layer is about 1.8g / cm3 .

[0058] In this embodiment, the density of the lightweight layer is less than the density of the two outermost carbon fiber resin composite layers of the composite plate.

[0059] Optionally, the lightweight layer has a density lower than that of each carbon fiber resin composite layer.

[0060] Optionally, the density of the lightweight layer does not exceed 1.3 g / cm 3 Optionally, the density of the lightweight layer does not exceed 1.2 g / cm 3 Optionally, the density of the lightweight layer does not exceed 1.1 g / cm 3 Optionally, the density of the lightweight layer does not exceed 1.0 g / cm 3 Optionally, the density of the lightweight layer does not exceed 0.9 g / cm 3 Optionally, the density of the lightweight layer does not exceed 0.8 g / cm 3 Optionally, the density of the lightweight layer does not exceed 0.7 g / cm 3 Optionally, the density of the lightweight layer is not less than 0.3 g / cm 3 .

[0061] Optionally, the shear strength between the lightweight layer and the carbon fiber resin composite layer in contact therewith is not less than 50MPa. Optionally, the shear strength is not less than 60MPa. Optionally, the shear strength is not less than 70MPa. Optionally, the shear strength is not less than 80MPa. Optionally, the shear strength between the lightweight layer and the carbon fiber resin composite layer in contact therewith is not more than 100MPa.

[0062] Optionally, the lightweight layer includes one or more layers of a first lightweight fiber web, a first resin layer and a lightweight composite layer, and the lightweight composite layer includes a second resin layer and lightweight fiber strips or a second lightweight fiber web dispersed in the second resin layer.

[0063] Optionally, the material of the first light fiber web is selected from one or more of polyethylene, polypropylene, polyethylene terephthalate (PET), polyamide, polyacrylonitrile and polyvinyl chloride. The first light fiber web can be obtained by melt-blowing the above materials.

[0064] Optionally, the materials of the light fiber strips and the second light fiber web are independently selected from one or more of glass fiber, aramid fiber, poly(p-phenylene benzobisoxazole) (PBO) fiber, basalt fiber, Dyneema fiber and polyimide fiber.

[0065] Optionally, the materials of the first resin layer and the second resin layer are independently selected from thermoplastic resin and / or thermosetting resin.

[0066] Optionally, the materials of the first resin layer and the second resin layer are independently selected from one or more of epoxy resin, bismaleimide resin, polyimide resin, phenolic resin, polytetrafluoroethylene resin, polycarbonate resin, polyurethane resin, polyetheretherketone resin, polyetherimide resin and polyamide resin.

[0067] When the lightweight layer includes a lightweight composite layer, and the lightweight composite layer includes the second resin layer and lightweight fiber strips dispersed in the second resin layer, the lightweight fiber strips are placed side by side.

[0068] When the lightweight layer includes the first lightweight fiber web, due to its porous hollow structure, the first lightweight fiber web has a lower density than the first resin layer and the lightweight composite layer, which is beneficial to further reduce the weight of the composite board. Moreover, at this time, the sacrifice of bending strength and bending modulus is smaller.

[0069] Optionally, the number of layers of the first lightweight fiber web in the lightweight layer may be one layer or multiple layers.

[0070] Optionally, the number of layers of the first resin layer in the lightweight layer may be one layer or multiple layers.

[0071] Optionally, the lightweight composite layer includes a second resin layer and lightweight fiber strips dispersed in the second resin layer, and the number of lightweight composite layers in the lightweight layer is at least two.

[0072] Optionally, the lightweight layer includes a first lightweight composite layer and a second lightweight composite layer, and the first lightweight composite layer and the second lightweight composite layer are stacked and adjacent to each other;

[0073] The first lightweight composite layer includes a second resin layer and first lightweight fiber strips dispersed in the second resin layer, wherein the number of the first lightweight fiber strips is a plurality, and the plurality of first lightweight fiber strips are placed side by side;

[0074] The second lightweight composite layer includes a second resin layer and second lightweight fiber strips dispersed in the second resin layer, the number of the second lightweight fiber strips is multiple, and the multiple second lightweight fiber strips are placed side by side;

[0075] The extending direction of the first light fiber strip is perpendicular to the extending direction of the second light fiber strip.

[0076] The first lightweight composite layer and the second lightweight composite layer are stacked and arranged adjacent to each other, which is helpful to ensure uniform stress.

[0077] Optionally, the lightweight composite layer includes a second resin layer and a second lightweight fiber web dispersed in the second resin layer. The number of layers of the lightweight composite layer in the lightweight layer may be one layer or multiple layers.

[0078] It is understandable that the carbon fiber resin composite layer can be prepared by compression molding or injection molding. When the light layer is the first resin layer or the light composite layer, it can also be prepared by compression molding or injection molding.

[0079] Taking the carbon fiber resin composite layer as an example, since the injection molding process uses chopped carbon fibers, the chopped carbon fibers are mixed in the resin and then injected into the mold. After cooling and demolding, the flexural strength and flexural modulus of the obtained carbon fiber resin composite layer are usually lower than the flexural strength and flexural modulus of the carbon fiber resin composite layer formed by the molding process. For example, the flexural strength of the carbon fiber resin composite layer produced by the injection molding process is 20% to 40% of the flexural strength of the carbon fiber resin composite layer produced by the molding process. Therefore, it is preferred to use the molding process to produce the carbon fiber resin composite layer. However, in products and areas where the requirements for flexural strength and flexural modulus are not so strict, the injection molding process can also be used to produce the carbon fiber resin composite layer. Similarly, when it is preferred to produce a lightweight composite layer by the molding process, the injection molding process can also be used to produce a lightweight composite layer in products and areas where the requirements for flexural strength and flexural modulus are not so strict.

[0080] Optionally, the thickness of the light layer in the composite board accounts for 20% to 70%. For example, the thickness of the light layer in the composite board accounts for, but is not limited to, 20%, 30%, 40%, 50%, 60%, or 70%.

[0081] Alternatively, the composite panel may be prepared by compression molding.

[0082] Optionally, the method for preparing the composite plate comprises the following steps:

[0083] Stacking multiple carbon fiber resin composite layers and lightweight layers in a mold so that the lightweight layer is located between any two carbon fiber resin composite layers;

[0084] Temperature and pressure are applied to form a composite board.

[0085] Alternatively, the temperature may be 100°C to 150°C.

[0086] Optionally, before stacking multiple layers of carbon fiber resin composite layers and lightweight layers in the mold, the method further includes cutting the carbon fiber resin composite layers and lightweight layers according to the size of the mold.

[0087] Optionally, after molding, cooling and demoulding steps are also included.

[0088] The composite board of this embodiment can be applied to a flexible support board, for example, as a support board under the display module. It can also be applied to a housing, for example, as a laptop housing, a mobile phone housing. It can also be applied to structural parts of electronic equipment, for example, as a molded shaft inclined plate, an IC support sheet, a motherboard bracket, a battery compartment, etc.

[0089] A second aspect of the present application provides a display module. In one embodiment, the display module includes a flexible display screen and the above-mentioned composite board, and the composite board and the flexible display screen are stacked.

[0090] Optionally, the composite plate is located on a non-display surface side of the flexible display screen.

[0091] The display module of this embodiment has the advantages of the above-mentioned composite board, which will not be described in detail here.

[0092] A third aspect of the present application provides a shell. In one embodiment, the shell includes the above-mentioned composite plate.

[0093] The shell of this embodiment has the advantages of the above-mentioned composite plate, which will not be described in detail here.

[0094] A fourth aspect of the present invention provides an electronic device. In one embodiment, the electronic device includes a housing and a display module disposed on the housing;

[0095] The display module is as described above; and / or, the housing is as described above.

[0096] The electronic device of this embodiment has the advantages of the above-mentioned composite board, which will not be described in detail here.

[0097] In one example, the electronic device is a flexible electronic device, comprising a first housing, a second housing and the above-mentioned display module;

[0098] The first shell is rotatably connected to the second shell to be unfolded or folded;

[0099] The display module is arranged on the first shell and the second shell, and is located on the same side of the first shell and the second shell when the first shell and the second shell are unfolded.

[0100] The display module is as described above; and / or, the first shell and the second shell are independently as described above.

[0101] The electronic device of this example has the advantages of the above-mentioned composite board, which will not be described in detail here.

[0102] In this embodiment, the electronic device can be any of various types of computer system devices that are mobile or portable and perform wireless communication. Specifically, the electronic device can be a mobile phone or smart phone (e.g., a phone based on iPhone TM, a phone based on Android TM), a portable game device (e.g., Nintendo DS TM, PlayStationPortable TM, Gameboy Advance TM, iPhone TM), a laptop, a PDA, a portable Internet device, a music player, and a data storage device, other handheld devices, and devices such as headphones, etc. The electronic device can also be other wearable devices that need to be charged (e.g., a head-mounted device (HMD) such as an electronic bracelet, an electronic necklace, an electronic device, or a smart watch).

[0103] The following is further described in conjunction with specific embodiments and comparative examples. The raw materials involved in the following specific embodiments and comparative examples, unless otherwise specified, can all be commercially available, the instruments used, unless otherwise specified, can all be commercially available, and the processes involved, unless otherwise specified, are all routinely selected by those skilled in the art.

[0104] Example 1

[0105] This embodiment provides a composite board. Figure 1 , including a carbon fiber resin composite layer 11, a light layer 10 and a carbon fiber resin composite layer 12 stacked in sequence, the material, thickness and density of the carbon fiber resin composite layer 11, the light layer 10 and the carbon fiber resin composite layer 12 are shown in Table 1, and the density of the composite board of this embodiment is shown in Table 1, referring to the standard ASTM D3039, the sample length is 250mm, the width is 25mm, a universal mechanical tensile machine is used, clamped by a clamp, and the stretching rate is 1.3mm / min. The flexural strength and flexural modulus during the stretching process are recorded by the equipment, and the results are shown in Table 1.

[0106] Example 2

[0107] This embodiment provides a composite board. Figure 2 , including a carbon fiber resin composite layer 21, a carbon fiber resin composite layer 22, a light layer 20, a carbon fiber resin composite layer 23 and a carbon fiber resin composite layer 24 stacked in sequence, the material, thickness and density of the carbon fiber resin composite layer 21, the carbon fiber resin composite layer 22, the light layer 20, the carbon fiber resin composite layer 23 and the carbon fiber resin composite layer 24 are shown in Table 1, and the density of the composite plate of this embodiment is shown in Table 1, the standard is ASTM D3039, the sample length is 250mm, the width is 25mm, a universal mechanical tensile machine is used, the clamp is clamped, and the stretching rate is 1.3mm / min. The flexural strength and flexural modulus during the stretching process are recorded by the equipment, and the results are shown in Table 1.

[0108] Example 3

[0109] This embodiment provides a composite board. Figure 1 , including a carbon fiber resin composite layer 11, a light layer 10 and a carbon fiber resin composite layer 12 stacked in sequence, the material, thickness and density of the carbon fiber resin composite layer 11, the light layer 10 and the carbon fiber resin composite layer 12 are shown in Table 1, the density of the composite board of this embodiment is shown in Table 1, the standard is ASTM D3039, the sample length is 250mm, the width is 25mm, a universal mechanical tensile machine is used, clamped by a clamp, and the stretching rate is 1.3mm / min. The flexural strength and flexural modulus during the stretching process are recorded by the equipment, and the results are shown in Table 1.

[0110] Comparative Example 1

[0111] This comparative example provides a composite board, see Figure 3 , including sequentially stacking carbon fiber resin composite layer 31, carbon fiber resin composite layer 31 and carbon fiber resin composite layer 33, the material, thickness and density of each carbon fiber resin composite layer are shown in Table 1, the density of the composite board of this comparative example is shown in Table 1, standard ASTM D3039, sample length 250mm, width 25mm, using a universal mechanical tensile machine, clamped by a clamp, and the stretching rate is 1.3mm / min. The flexural strength and flexural modulus during the stretching process are recorded by the equipment, and the results are shown in Table 1.

[0112] Comparative Example 2

[0113] This comparative example provides a composite board, see Figure 4 , including sequentially stacking carbon fiber resin composite layer 41, carbon fiber resin composite layer 42, carbon fiber resin composite layer 43, carbon fiber resin composite layer 44, carbon fiber resin composite layer 45 and carbon fiber resin composite layer 46, the material, thickness and density of each carbon fiber resin composite layer are shown in Table 1, the density of the composite board of this comparative example is shown in Table 1, standard ASTM D3039, sample length 250mm, width 25mm, using a universal mechanical tensile machine, clamped by a clamp, and the stretching rate is 1.3mm / min. The flexural strength and flexural modulus during the stretching process are recorded by the equipment, and the results are shown in Table 1.

[0114] Table 1

[0115]

[0116] As can be seen from Table 1, compared with Comparative Example 1, the density of Example 1 and Example 3 is lower, and at the same time, the flexural strength and flexural modulus can retain 60-80% of that of Comparative Example 1. Compared with Comparative Example 2, the density of Example 2 is lower, and at the same time, the flexural strength and flexural modulus can retain more than 60% of that of Comparative Example 2.

[0117] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A composite board, characterized in that: Includes carbon fiber resin composite layer and lightweight layer; The carbon fiber resin composite layer has multiple layers, the multiple carbon fiber resin composite layers and the light layer are stacked, and the light layer is located between any two carbon fiber resin composite layers; The density of the two outermost carbon fiber resin composite layers of the composite plate is greater than the density of the lightweight layer.

2. The composite panel according to claim 1, characterized in that: The light layer has one layer, and the carbon fiber resin composite layers on both sides of the light layer have the same number of layers.

3. The composite panel according to claim 2, characterized in that: The carbon fiber resin composite layers on both sides of the lightweight layer are symmetrically arranged.

4. The composite panel according to any one of claims 1 to 3, characterized in that: The lightweight layer meets the following conditions: (1) The density of the lightweight layer does not exceed 1.3 g / cm 3 ; (2) The shear strength between the lightweight layer and the carbon fiber resin composite layer in contact therewith is not less than 50 MPa.

5. The composite panel according to claim 4, characterized in that: The lightweight layer includes one or more layers of a first lightweight fiber web, a first resin layer, and a lightweight composite layer. The lightweight composite layer includes a second resin layer and lightweight fiber strips or a second lightweight fiber web dispersed in the second resin layer.

6. The composite panel according to claim 5, characterized in that: The material of the first lightweight fiber web is selected from one or more of polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyacrylonitrile and polyvinyl chloride; and / or The materials of the first resin layer and the second resin layer are independently selected from one or more of epoxy resin, bismaleimide resin, polyimide resin, phenolic resin, polytetrafluoroethylene resin, polycarbonate resin, polyurethane resin, polyetheretherketone resin, polyetherimide resin and polyamide resin; and / or The materials of the light fiber strips and the second light fiber web are independently selected from one or more of glass fiber, aramid fiber, poly(p-phenylene benzobisoxazole) fiber, basalt fiber, Dyneema fiber and polyimide fiber.

7. The composite panel according to any one of claims 1 to 3, 5 to 6, characterized in that: Each of the carbon fiber resin composite layers independently includes a third resin layer and a carbon fiber mesh or carbon fiber strips dispersed in the third resin layer.

8. The composite panel according to claim 7, characterized in that: The material of the third resin layer is selected from one or more of epoxy resin, bismaleimide resin, polyimide resin, phenolic resin, polytetrafluoroethylene resin, polycarbonate resin, polyurethane resin, polyetheretherketone resin, polyetherimide resin and polyamide resin.

9. The composite panel according to claim 7, characterized in that: The lightweight layer has one layer, and the composite plate includes a first carbon fiber resin composite layer and a second carbon fiber resin composite layer that are adjacent and located on the same side of the lightweight layer; The first carbon fiber resin composite layer includes a third resin layer and first carbon fiber strips dispersed in the third resin layer, the number of the first carbon fiber strips is multiple, and the multiple first carbon fiber strips are placed side by side; The second carbon fiber resin composite layer includes a third resin layer and second carbon fiber strips dispersed in the third resin layer, the number of the second carbon fiber strips is multiple, and the multiple second carbon fiber strips are placed side by side; An extending direction of the first carbon fiber strips is perpendicular to an extending direction of the second carbon fiber strips.

10. The composite panel according to any one of claims 1 to 3, 5 to 6, 8 to 9, characterized in that: The thickness of the lightweight layer in the composite board accounts for 20% to 70%.

11. A display module, characterized in that: It comprises a flexible display screen and the composite board according to any one of claims 1 to 10, wherein the composite board and the flexible display screen are stacked.

12. A housing, characterized in that: The composite board comprises the composite board according to any one of claims 1 to 10.

13. An electronic device, characterized in that: It comprises a housing and a display module arranged on the housing; The display module is as described in claim 11; and / or, the shell is as described in claim 12.

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