CN114664180A - Composite structure, flexible screen assembly and foldable terminal - Google Patents

Composite structure, flexible screen assembly and foldable terminal Download PDF

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Publication number
CN114664180A
CN114664180A CN202011573085.4A CN202011573085A CN114664180A CN 114664180 A CN114664180 A CN 114664180A CN 202011573085 A CN202011573085 A CN 202011573085A CN 114664180 A CN114664180 A CN 114664180A
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CN
China
Prior art keywords
fiber
flexible screen
ebonite
composite structure
composite
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Pending
Application number
CN202011573085.4A
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Chinese (zh)
Inventor
秦圆
姚威威
陈泰萌
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202011573085.4A priority Critical patent/CN114664180A/en
Publication of CN114664180A publication Critical patent/CN114664180A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
    • H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H04M1/0268—Details of the structure or mounting of specific components for a display module assembly including a flexible display panel

Abstract

The embodiment of the application provides a composite construction, including first support piece, the second support piece that sets up side by side, and set up first support piece with between the second support piece, and with first support piece with the connecting piece of can buckling that the second support piece is connected, first support piece with the material of second support piece includes ebonite fibre combined material, ebonite fibre combined material includes at least one deck fibre layer, and the solidification is in ebonite material on the fibre layer. This composite construction can be used to support flexible screen, and wherein first support piece and second support piece adopt ebonite fibre combined material, not only have high strength, and the quality is light moreover, can realize the product lightweight when providing good rigid support for flexible screen, is favorable to improving the product competitiveness at collapsible terminal. The embodiment of the application also provides a foldable terminal comprising the composite structure.

Description

Composite structure, flexible screen assembly and foldable terminal
Technical Field
The embodiment of the application relates to the technical field of flexible screens, in particular to a composite structure, a flexible screen assembly and a foldable terminal.
Background
With the development of flexible display technology, flexible screens are increasingly applied to terminal equipment, and in order to maintain the flatness and rigidity of the screen of the flexible screen of the foldable terminal, a metal layer is generally arranged below the screen to serve as a screen lower supporting structural member. The metal layer is mainly made of stainless steel and titanium alloy. Stainless steel is a widely used material, but the weight of the stainless steel is heavy, which is not beneficial to reducing the weight of the foldable terminal; the titanium alloy is relatively light, but the cost of the titanium alloy is far higher than that of stainless steel, and the rigidity and the strength of the titanium alloy are lower than those of the stainless steel, so that the bending reliability risk is higher than that of the stainless steel, and the titanium alloy is not widely applied at present. In order to overcome the defects of the stainless steel or titanium alloy screen supporting structural member, it is necessary to provide a flexible screen supporting structure which can simultaneously realize high structural strength, light weight and low cost.
Disclosure of Invention
In view of this, the embodiment of the present application provides a composite structure, which has high strength and light weight compared to metal materials such as stainless steel by using a ebonite fiber composite material as a main material, and which can be used for supporting a flexible screen, and has high weight reduction benefit and low cost while providing good rigid support for the flexible screen, and is beneficial to improving the product competitiveness of a foldable terminal.
Specifically, the first aspect of the embodiment of the present application provides a composite structure, including first support piece, the second support piece that sets up side by side, and set up first support piece with between the second support piece, and with the first support piece with the connector that can buckle that the second support piece is connected, first support piece with the material of second support piece includes ebonite fiber composite, ebonite fiber composite includes at least one deck fibre layer, and solidifies ebonite material on the fibre layer. The first supporting piece and the second supporting piece are made of hard rubber fiber composite materials, namely fiber-reinforced hard rubber materials, so that the flexible screen support device is light in weight and high in strength, can provide good rigid support for the flexible screen, has high weight reduction benefit, is low in material cost, and is favorable for improving the product competitiveness of the foldable terminal.
In the embodiment of the application, the fiber layer comprises fiber unidirectional cloth and/or fiber woven cloth. That is, the fiber weaving manner of each fiber layer may be a unidirectional weaving manner or a multidirectional weaving manner.
In an embodiment of the present application, the hard rubber material includes a hard resin and/or a hard rubber. The support member for supporting the flexible screen body needs to have high rigidity, and the rigidity requirement can be met by selecting hard resin and/or hard rubber.
In the embodiment of the present application, the hard glue material comprises one or more of epoxy resin, phenolic resin, amino resin, unsaturated polyester, silicon ether resin, polyolefin, polyamide, polyformaldehyde, polycarbonate, polyphenyl ether and polysulfone.
In the embodiment of the application, the fiber layer comprises one or more of glass fiber, carbon fiber, aramid fiber, alumina fiber, ultra-high molecular weight polyethylene fiber and poly-p-phenylene benzobisoxazole fiber.
In the embodiment of the application, the mass content of the fiber in the ebonite fiber composite material is 10-80%. The increase in fiber content can increase the strength of the ebonite fiber composite.
In the embodiment of the application, the ebonite fiber composite material comprises a plurality of fiber layers, and the fiber layers and the ebonite material form a composite laminated body in which fibers and ebonite are alternately laminated; or a plurality of fiber layers are stacked to form a fiber lamination body, and the hard glue material is solidified on the fiber lamination body.
In the embodiment of the application, the material of the bendable connecting piece comprises one or more of an organic flexible material, a soft rubber fiber composite material and a bendable metal material. The three materials can realize the bending performance of the bendable connecting piece so as to match the folding and unfolding of the flexible screen, wherein the soft rubber fiber composite material and the organic flexible material can further obtain the weight reduction benefit.
In the embodiment of the present application, the organic flexible material includes one or more of fluororubber, silicone rubber, thermoplastic elastomer, polyvinyl chloride, polyimide, polyethylene terephthalate, cyclic olefin polymer, liquid crystal polymer, and polydimethylsiloxane.
In the embodiment of the application, the soft glue fiber composite material comprises at least one fiber layer and a soft glue material solidified on the fiber layer; the soft rubber material comprises one or more of fluororubber, silicon rubber and thermoplastic elastomer.
In the embodiment of the application, the mass content of the fibers in the soft rubber fiber composite material is 10 to 80 percent.
In the embodiment of the application, the soft glue fiber composite material comprises a plurality of fiber layers, and the fiber layers and the soft glue material form a composite laminated body in which fibers and soft glue are alternately laminated; or a plurality of fiber layers are laminated to form a fiber laminated body, and the soft glue material is solidified on the fiber laminated body.
In the embodiment of the application, the bendable metal material comprises one or more of stainless steel, titanium alloy and aluminum alloy. Specifically, in order to achieve the bendability well, porous stainless steel, porous titanium alloy, and porous aluminum alloy may be used.
In the embodiment of the application, when the bendable connecting piece is a soft rubber fiber composite material, the composite structure comprises a fiber layer which continuously exists in the first supporting piece, the second supporting piece and the bendable connecting piece and is integrally woven. The composite structure may be a composite structure comprising one or more integrally woven fibrous layers.
In an embodiment of the application, the thickness of the composite structure is 0.1mm to 2 mm. The thickness of the composite structure can be designed according to the performance of the material and the actual application requirement of the product.
In the embodiment of the application, the first supporting piece, the bendable connecting piece and the second supporting piece are combined together in a hot pressing, gluing, welding or embedding mode.
The composite construction that this application embodiment first aspect provided has high strength, high rigidity, light weight concurrently, low-cost characteristics, has the performance of can buckling simultaneously, can be applied to in collapsible terminal product, when satisfying demands such as intensity, rigidity, realizes the product lightweight, promotes collapsible terminal product's competitiveness.
A second aspect of an embodiment of the present application provides a terminal including the composite structure according to the first aspect of the embodiment of the present application. The composite structure can be used as an under-screen support structure and can also be used as other functional components.
A third aspect of embodiments of the present application provides a flexible screen assembly, including a flexible screen and a flexible screen support structure, where the flexible screen support structure is made of the composite structure according to the first aspect of embodiments of the present application. Through adopting above-mentioned composite construction as flexible screen bearing structure, can realize the product lightweight when satisfying flexible screen bearing structure's intensity, rigidity and can buckle the performance, subtract heavy more stainless steel flexible screen bearing structure and exceed 60%, with low costs moreover.
An embodiment of the present application further provides a foldable terminal, including the flexible screen assembly according to the third aspect of the embodiment of the present application. The flexible screen comprises a bending area and non-bending areas arranged on two sides of the bending area, the flexible screen supporting structure is arranged on the outer surface of the flexible screen, a first supporting piece and a second supporting piece of the flexible screen supporting structure are respectively corresponding to the non-bending areas arranged on two sides of the flexible screen, and the bendable connecting pieces are corresponding to the bending areas of the flexible screen. The foldable terminal that this application embodiment provided, flexible screen bearing structure intensity is high, can provide sufficient rigidity for the flexible screen and support, and the quality is light moreover, and is with low costs, can promote product competitiveness, promotes user experience.
Drawings
Fig. 1 is a schematic structural diagram of a foldable terminal provided in an embodiment of the present application;
FIG. 2 is a schematic view of a flexible screen support structure provided by an embodiment of the present application;
FIG. 3 is a side view in the Y direction of the flexible screen support structure of the embodiment of the present application of FIG. 2;
FIG. 4 is a schematic structural diagram of a ebonite fiber composite material according to an embodiment of the present application;
FIG. 5 is a schematic structural view of a multi-directional fiber weave according to an embodiment of the present application;
FIG. 6 is a schematic structural view of a stiff gum fiber composite in another embodiment of the present application;
FIG. 7 is a schematic structural view of a stiff gum fiber composite in another embodiment of the present application;
FIG. 8 is a schematic view of a multi-angle folding of a fiber layer by a plurality of fiber braiding layers according to an embodiment of the present application;
FIG. 9 is a schematic structural view of a flexible screen support structure including an integrally woven fabric layer according to an embodiment of the present application;
FIGS. 10A-10E are schematic views illustrating the connection between a first supporting member and a bendable connecting member, the first supporting member and the bendable connecting member being made of a stiff viscose composite material according to an embodiment of the present application;
FIG. 11 is a flow chart of a process for preparing a ebonite fiber composite material provided by embodiments of the present application;
fig. 12 is a flow chart of a process for preparing a ebonite fiber composite material according to another embodiment of the present disclosure.
Detailed Description
The following description will be made with reference to the drawings in the embodiments of the present application.
The embodiment of the application provides a foldable terminal, which can be a mobile phone, a tablet computer, a notebook computer, a game book, an electronic book, a vehicle-mounted computer, a display, a wearable device and other terminal products. Referring to fig. 1, the foldable terminal 10 includes a flexible screen 200 and a flexible screen support structure 100 attached to a side of the flexible screen 200 facing away from a display surface. The flexible screen 200 includes a bending region 201 and non-bending regions 202 located at two sides of the bending region 201, and the non-bending regions 202 are planar. The flexible screen 200 has a bendable characteristic, and can be bent in the bending area 201 to realize folding and unfolding of the flexible screen 200. The flexible panel 200 may be an Active Matrix Organic Light Emitting Diode (AMOLED) display panel having a flexible resin material such as polyethylene terephthalate (PET) as a base.
The flexible screen supporting structure 100 provided by the embodiment of the present application is made of a composite structure, referring to fig. 2 and 3, the composite structure includes a first supporting member 101, a bendable connecting member 103 and a second supporting member 102, which are arranged side by side, the bendable connecting member 103 is arranged between the first supporting member 101 and the second supporting member 102, and two opposite sides of the bendable connecting member 103 are respectively connected with the first supporting member 101 and the second supporting member 102. The first support 101, the bendable connecting element 103, and the second support 102 are arranged side by side along a first direction (X direction in fig. 2). The material of the first support 101 and the second support 102 comprises a hard viscose composite material. Specifically, the first support 101 and the second support 102 are stiff glue fiber composite plates in a flat plate shape.
Referring to fig. 1, the flexible screen support structure 100 is attached to a side of the flexible screen 200 away from the display surface, and is used for bearing and supporting the flexible screen 200 of the foldable terminal, wherein the first support member 101 and the second support member 102 of the flexible screen support structure 100 correspond to a non-bending region 202 of the flexible screen 200, and the bendable connecting member 103 corresponds to a bending region 201 of the flexible screen 200. When the foldable terminal 10 is folded, the bending region 201 of the flexible screen 200 is bent together with the foldable connection member 103 supporting the bending region 201. When the foldable terminal 10 is unfolded, the bending region 201 of the flexible screen 200 is unfolded together with the foldable connector 103 supporting the bending region 201. When the included angle between the first supporting member 101 and the second supporting member 102 is smaller than 180 °, the flexible screen 200 is in the bent state, and when the included angle between the first supporting member 101 and the second supporting member 102 is equal to 180 °, the flexible screen 200 is in the unfolded state. The flexible screen support structure 100 may support the flexible screen 200 during the folding or unfolding process of the flexible screen 200, ensure the flatness of the flexible screen 200, and protect the non-display surface of the flexible screen 200.
In the embodiment of the present application, the flexible screen support structure 100 may be adhered to a surface of the flexible screen 200 facing away from the display surface by an adhesive. That is, the first supporting member 101, the second supporting member 102 and the bendable connecting member 103 may be bonded to the flexible screen 200 by adhesives, and different areas of the flexible screen supporting structure 100 may be tightly and firmly attached to the flexible screen 200 by the same adhesives or different adhesives. In the present embodiment, the length and width dimensions (i.e., the X-direction and Y-direction dimensions in fig. 2) of the flexible screen support structure 100 are identical or substantially identical to the length and width dimensions of the flexible screen 200.
According to the flexible screen supporting structure 100 provided by the embodiment of the application, the first supporting piece 101 and the second supporting piece 102 are made of the ebonite fiber composite material, the ebonite fiber composite material has high strength, the mass is light relative to metal materials such as stainless steel, high weight reduction benefits can be achieved when good rigid supporting is provided for the flexible screen, and the product competitiveness of the foldable terminal can be improved.
Referring to fig. 4, a ebonite fiber composite material 110 of the present application includes a fiber layer 111, and an ebonite material 112 cured on the fiber layer 111. In the present embodiment, the hard rubber material 112 includes hard resin and/or hard rubber. In the application, the concrete types of the hard resin and the hard rubber are not particularly limited, the application requirements of the electronic equipment can be met, and the hard resin and the hard rubber are matched with fibers to provide enough rigid support for the flexible screen. Specifically, the hardcoat material 112 includes, but is not limited to, one or more of epoxy, phenolic, amino, unsaturated polyester, silicone, polyolefin, polyamide, polyoxymethylene, polycarbonate, polyphenylene oxide, polysulfone. It will be appreciated that in order to minimise the overall weight of the flexible screen support structure, a relatively low mass of hard-gel material may be selected whilst satisfying the mechanical support. The stiff glue material 112 may be impregnated and cured on the fiber layer 111 by a solution impregnation method or a hot melt method in combination with a hot press process.
In the embodiment of the present application, the fibers in the fiber layer 111 are continuous fibers, and may specifically include, but are not limited to, one or more of glass fibers, carbon fibers, aramid fibers, aluminum oxide fibers, ultra-high molecular weight polyethylene fibers, and poly-p-phenylene benzobisoxazole fibers. Wherein, the ultra-high molecular weight polyethylene fiber is the fiber spun by polyethylene with molecular weight of more than 100 ten thousand. The fiber layer 111 may be formed by weaving one kind of fiber, or may be formed by mixing two or more kinds of fibers. Wherein the hybrid weaving can integrate the performance advantages of various fibers.
In the embodiment of the application, the mass content of the fiber in the ebonite fiber composite material can be 10-80%. Specifically, the mass content of the fibers in the ebonite fiber composite material may be, for example, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%. The fiber content in the hard rubber fiber composite material can be adjusted according to the specific rigid support requirement and in combination with the mechanical properties of the selected hard resin or hard rubber and the like. Generally, the higher the content of the fibers, the lighter the overall weight of the ebonite fiber composite material is, and the more weight is reduced. In some embodiments, the ebonite fiber composite has a fiber mass content of 30% to 70% for a combination of rigid support properties and weight reduction requirements.
In the present embodiment, the fiber weaving manner of each fiber layer 111 may be a unidirectional weaving manner or a multidirectional weaving manner. That is, the fiber layer 111 may be a fiber unidirectional fabric or a fiber woven fabric. A fibrous unidirectional fabric, i.e. a fabric woven uniaxially, refers to a woven fabric having a large number of woven yarns in one direction (usually the warp direction, but also the weft direction) and only a small number and usually fine yarns in the other direction, resulting in a fabric having virtually all of the strength of the fabric in one direction. The fiber woven fabric is a woven fabric in which fibers are multi-axially woven, a plurality of directions have a large number of woven yarns, and the strength of the final fabric is distributed in a plurality of axial directions. For example, the warp and weft double-axial weaving, namely 0 °/90 ° weaving means that the fiber distribution of the fiber cloth is biaxial, the angles of the two axial directions are 0 ° and 90 °, respectively, and the included angle of the fibers in the two axial directions is 90 °. For another example, 45 ° weaving (i.e., +45 °/-45 °) means that the fiber distribution of the fiber cloth is biaxial, the angles of the two axial directions are +45 ° and-45 °, respectively, and the included angle of the fibers in the two axial directions is 90 °.
In the embodiment of the present application, the specific knitting form of the fiber multi-directional knitting is not limited. Specifically, the multidirectional weaving pattern may be a plain weave as shown in fig. 5 (a), a twill weave as shown in fig. 5 (b), a satin weave as shown in fig. 5 (c), or the like. In fig. 5, (a), (b), and (c) show biaxial knitting of 0 °/90 ° each.
In the present embodiment, the ebonite fiber composite material may include only one fiber layer 111, or may include a plurality of (two or more) fiber layers 111. For example, the fiber layer 111 in the stiff fiber composite of fig. 4 is one layer, and the fiber layer 111 in the stiff fiber composite of fig. 6 and 7 is three layers. When the fiber layer 111 is a single layer, the single fiber layer 111 is usually a multi-direction woven fiber layer in order to satisfy the strength requirement. When the fiber layer 111 is a plurality of layers, the mechanical strength of the ebonite fiber composite material is enhanced, and the strength of the ebonite fiber composite material in all directions is improved. The multiple fiber layers 111 can be laminated at different angles (multi-angle), and each fiber layer 111 can be woven in one direction or in multiple directions. In some embodiments, the plurality of fiber layers 111 may be a plurality of fiber unidirectional fabrics stacked at different angles, i.e., each fiber layer 111 is a fiber unidirectional fabric. In the present embodiment, the stacking direction of the plurality of fiber layers 111 may be any angle within the range of 0 ° to 90 °. The multi-layer fiber layers are overlapped at different angles, so that fibers are distributed in multiple directions to form a fiber network, the mechanical strength requirements of the hard rubber fiber composite material in different directions are met, and rigid support is provided for the flexible screen better. As shown in fig. 8, fig. 8 is a schematic diagram of four layers of fiber unidirectional cloth being laminated at different angles, and the four layers of fiber unidirectional cloth are laminated at 0 °, +45 °, 90 °, -45 °, respectively. Therefore, the fibers can be continuously distributed in a plurality of directions, the strength of the ebonite fiber composite material in each direction is improved, and the overall mechanical property of the ebonite fiber composite material is improved. In the present application, the 0 ° direction is the X direction in fig. 2, that is, the direction in which the first supporting member 101, the bendable connecting member 103, and the second supporting member 103 are arranged side by side.
In some embodiments of the present application, as shown in fig. 6, multiple layers of fiber layers 111 and a stiff glue material form a composite laminate with alternating layers of fiber and stiff glue. The fibrous materials of each fibrous layer 111 may or may not be the same. The materials of each hard glue layer can be the same or different. Wherein, due to different manufacturing processes, for example, the solution impregnation method is usually used to impregnate the two sides of each fiber layer 111 with the hard glue material, when multiple fiber layers are stacked, if different fiber layers are impregnated with different hard glue materials, the hard glue layer in the middle of the stacked body may comprise two different hard glue materials. Wherein, different fiber layers are selectively impregnated with the same ebonite material, which is more favorable for forming strong binding force. In other embodiments of the present application, as shown in fig. 7, the multiple fiber layers 111 may be stacked in contact with each other, and then impregnated with the stiff glue material, that is, the stiff glue fiber composite material includes a fiber stack 11 formed by stacking multiple fiber layers, and the stiff glue material impregnated and cured on the fiber stack 11.
In the embodiment of the present application, the material of the bendable connecting element 103 may include one or more of a soft rubber fiber composite material, a bendable metal material, and an organic flexible material. The bendable connecting element 103 made of the above materials can have good bendable performance, so that the first supporting element 101 and the second supporting element 102 can be folded or unfolded relatively.
In one embodiment, the bendable connector 103 is a soft rubber fiber composite material, specifically a soft rubber fiber composite board, and two sides of the soft rubber fiber composite board are respectively connected to the first supporting member 101 and the second supporting member 102 formed by hard rubber fiber composite boards. At this time, the flexible screen support structure 100 is a composite plate structure of hard rubber fiber composite material-soft rubber fiber composite material-hard rubber fiber composite material, the middle area adopts soft rubber fiber composite material to realize flexible and bendable function, and the hard rubber fiber composite material is adopted on two sides to provide screen lower support for the flexible screen. In the embodiment of the application, the soft glue fiber composite material comprises at least one fiber layer and a soft glue material which is soaked and solidified on the fiber layer. In the embodiment of the application, the selection of the fibers in the soft glue fiber composite material, the specific structure of the fiber layer, the structure of the soft glue fiber composite material, the preparation method and the like can refer to the related description of the hard glue fiber composite material, and the description is omitted here. The utility model provides a difference of flexible glue fibre combined material and ebonite fibre combined material lies in, and flexible glue fibre combined material selects flexible glue material and fibre complex, and ebonite fibre combined material selects ebonite material and fibre complex, and the softness of flexible glue fibre combined material can be buckled, can cooperate the bending of the bending zone of flexible screen as the connecting piece of can buckling, and ebonite fibre combined material rigidity is strong, can powerfully support the non-bending zone of flexible screen. The soft rubber material may include, but is not limited to, one or more of fluororubber, silicone rubber, and thermoplastic elastomer. The thermoplastic elastomer, i.e., the elastomer or the synthetic rubber, may specifically include, but is not limited to, one or more of Thermoplastic Polyurethane (TPU), thermoplastic polyester elastomer (TPEE), styrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer (POE), polyether ester-based thermoplastic elastomer, and polyamide-based thermoplastic elastomer.
In the embodiment of the application, the mass content of the fibers in the soft rubber fiber composite material is 10 to 80 percent. Specifically, the mass content of the fibers in the soft gel fiber composite material may be, for example, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%. The fiber content in the soft rubber fiber composite material can be adjusted according to the specific bending performance requirement and the rigid support requirement and by combining the performance of the selected soft rubber material. Generally, the more the content of the fiber is, the more the overall strength of the soft rubber fiber composite material is increased, the bendability is reduced, and the weight is relatively reduced. In some embodiments, the soft gel fiber composite may have a fiber mass content of 10% to 50% in combination with bendability, rigid support properties, and weight reduction requirements.
In the embodiment of the present application, in the flexible screen support structure 100, the fiber layers of the first support member 101 and the second support member 102 and the fiber layer of the bendable connecting member 103 may be independent from each other in design, or may be integrally woven. The materials of the fiber layers can be the same or different; the number of the fiber layers can be the same or different; the fiber layer combination modes can be the same or different; the fiber content may be the same or different. The fiber content in the ebonite fiber composite material and the soft glue fiber composite material can be selected according to specific conditions, and the fiber content in the soft glue fiber composite material is lower than that in the ebonite fiber composite material in general.
In some embodiments of the present application, as shown in fig. 9, when the bendable connector 103 is a soft gel fiber composite, the flexible screen support structure 100 may include an integrally woven fiber layer 111 continuously existing in the first support 101, the second support 102 and the bendable connector 103. The flexible screen support structure 100 may be a structure including one or more integrally woven fabric layers. As shown in fig. 9, comprises two integrally woven fabric layers. The integrally woven fabric layer can simplify the manufacturing process and ensure the reliable connection of the first support member 101, the second support member 102 and the bendable connecting member 103.
In the embodiment of the application, when the soft glue fiber composite material comprises a plurality of fiber layers, the fiber and soft glue fiber composite material can be a composite laminated body formed by alternately laminating fibers and soft glue through the plurality of fiber layers and the soft glue material; or a fiber laminated body is formed by laminating a plurality of fiber layers, and the soft rubber material is soaked and solidified on the fiber laminated body.
In the embodiment of the present application, the bendable connecting element 103 may be formed by a single layer of woven fiber fabric, or may be formed by a plurality of layers of unidirectional fiber fabric stacked at multiple angles.
In the embodiment of the present application, the specific preparation method of the flexible screen support structure 100 having the structure of the ebonite fiber composite material-soft rubber fiber composite material-ebonite fiber composite material is not limited, and for example, the flexible screen support structure may be prepared by the following two methods:
the first method is as follows:
step 101: taking a plurality of fiber layers, and overlapping the plurality of fiber layers at multiple angles to form a fiber overlapped body;
wherein, the multilayer fiber layer is usually multilayer fiber unidirectional cloth, and the lamination direction of the multilayer fiber layer can be any angle within the range of 0-90 degrees.
Step 102: and (3) dipping hard glue materials on two sides of the fiber laminated body by adopting a solvent dipping method or a hot melting method, dipping soft glue materials in the middle, and performing hot pressing to obtain the flexible screen supporting structure 100. The flexible screen support structure 100 prepared in this manner comprises an integrally woven fabric layer continuously present in a first support 101, a second support 102 and a bendable connector 103.
The second method comprises the following steps:
step 201: taking a fiber layer, and impregnating hard glue materials on two side surfaces of the fiber layer by adopting a solvent impregnation method or a hot melting method to form a hard glue fiber single-layer prepreg; carrying out multi-angle multi-layer superposition on the single-layer prepreg of the ebonite fiber to obtain a laminated prepreg of the ebonite fiber;
step 202: taking a fiber layer, and impregnating soft rubber materials on two side surfaces of the fiber layer by adopting a solvent impregnation method or a hot melting method to form a soft rubber fiber single-layer prepreg; carrying out multi-angle multi-layer lamination on the single-layer prepreg of the soft rubber fiber, and then carrying out hot pressing to obtain a soft rubber fiber composite board; in the step, a single-layer fiber layer with the target thickness can be directly selected, and multilayer superposition is not adopted. The fiber layer to be laminated in multiple layers is usually a fiber unidirectional fabric, and when a single fiber layer is directly selected, it is usually a fiber woven fabric.
Step 203: and arranging the hard adhesive fiber laminated prepreg, the soft adhesive fiber composite board and the hard adhesive fiber laminated prepreg side by side, and then performing hot press bonding to obtain the flexible screen support structure 100.
In this embodiment, the flexible screen support structure 100 is a composite board of ebonite fiber composite-soft gel fiber composite-ebonite fiber composite. The flexible screen support structure 100 is a flat plate-like or sheet-like structure as a whole.
When the two materials are arranged side by side, the hard glue fiber laminated prepregs on the two sides and the middle soft glue fiber composite board can be partially crossed and connected in order to enable the hard glue fiber composite material and the soft glue fiber composite material to form better combination at the splicing position. Specifically, the widths of the single-layer prepregs positioned in the middle of the laminated ebonite material are narrowed, that is, the single-layer prepregs are retracted by a certain width, an embedding space is reserved, the middle soft rubber fiber composite plate is partially embedded in the embedding space, and the preparation of the ebonite fiber composite material-soft rubber fiber composite material-ebonite fiber composite material without segment difference is realized after lamination. The ebonite fiber laminated prepreg forms an ebonite fiber composite board after hot pressing, namely the ebonite fiber composite material.
In other embodiments of this application, also can carry out multi-angle multilayer coincide with flexible glue fibre single layer preimpregnation material, obtain flexible glue fibre stromatolite preimpregnation material, then arrange rigid glue fibre stromatolite preimpregnation material, flexible glue fibre stromatolite preimpregnation material, rigid glue fibre stromatolite preimpregnation material side by side, later carry out hot pressing, obtain flexible screen bearing structure. In other some embodiments of this application, also can carry out multi-angle multilayer coincide with ebonite fibre individual layer preimpregnation material, obtain ebonite fibre stromatolite preimpregnation material, then carry out the hot pressfitting and obtain ebonite fibre composite sheet, arrange ebonite fibre composite sheet, flexible glue fibre composite sheet, ebonite fibre composite sheet side by side again, later carry out the hot pressfitting, obtain flexible screen bearing structure.
FIG. 11 is a flow chart of a process for preparing a ebonite fiber composite material using a solvent impregnation method; FIG. 12 is a flow chart of a process for preparing a ebonite fiber composite material using a hot melt process.
In this application embodiment, ebonite fiber composite and flexible glue fiber composite can adopt above-mentioned hot pressing mode to splice and combine, also can adopt other modes that can realize good combination such as bonding, melting to combine, or laser welding to splice and combine.
In another embodiment of the present application, the bendable connecting element 103 is a bendable metal connecting element, and two sides of the bendable metal connecting element are respectively connected to the first supporting element 101 and the second supporting element 102 formed by the hard rubber fiber composite board. The bendable metal connecting piece can be made of metal materials such as stainless steel, titanium alloy, aluminum alloy and the like. The bendable metal connector 103 may be combined with the first supporting member 101 and the second supporting member 102 by thermal compression, gluing, welding, embedding, or may be connected by a connecting mechanism.
In the embodiment of the present application, the specific preparation method of the flexible screen support structure 100 having the structure composition of ebonite fiber composite material-metal material-ebonite fiber composite material is not limited, and for example, the flexible screen support structure can be prepared by the following steps:
step 301: taking a fiber layer, and impregnating hard glue materials on two side surfaces of the fiber layer by adopting a solvent impregnation method or a hot melting method to form a hard glue fiber single-layer prepreg; carrying out multi-angle multi-layer superposition on the single-layer prepreg of the ebonite fiber to obtain a laminated prepreg of the ebonite fiber;
step 302: and (3) taking a metal sheet with a target thickness, arranging the hard adhesive fiber laminated prepreg, the metal sheet and the hard adhesive fiber laminated prepreg side by side, and then performing hot pressing to obtain the flexible screen supporting structure 100.
In this embodiment, the flexible screen support structure 100 is a composite plate of a ebonite fiber composite-metal material-ebonite fiber composite. The flexible screen support structure 100 is a flat plate-like or sheet-like structure as a whole.
In order to enable the ebonite fiber composite material and the metal sheet to form good combination at the splicing position, when the two materials are arranged side by side, the ebonite fiber laminated prepregs on the two sides and the middle metal sheet can be partially crossed and connected. Specifically, the widths of the single-layer prepregs positioned in the middle of the laminated prepreg of the ebonite can be narrowed, that is, the single-layer prepregs are retracted to a certain width, an embedding space is reserved, two ends of the middle metal sheet are reduced by a certain thickness to form an embedding part matched with the embedding space (a step surface is formed due to the surface reduction), the embedding part is embedded in the embedding space of the laminated prepreg of the ebonite, and the preparation of the ebonite composite material-metal material-ebonite composite material composite plate without segment difference can be realized after hot pressing. The embedded parts at the two ends of the metal sheet can form holes through etching, so that the combination of the hard rubber fiber composite material and the metal sheet is enhanced. Before hot pressing, plasma treatment can be carried out on the surface of the metal sheet, so that the surface roughness is improved, and the bonding of the hard rubber fiber composite material and the metal sheet is enhanced.
In the embodiments of the present application, the metal sheet as the bendable connecting member is required to have good bendability, and is usually a porous metal sheet, and the porous holes extend longitudinally (i.e., in the Y direction).
In the embodiment of the application, the hard rubber fiber composite material and the metal material can be spliced and combined by the hot pressing method, or can be spliced and combined by other methods capable of realizing good combination, such as bonding, fusion bonding, laser welding and the like.
In another embodiment of the present application, the bendable connecting element 103 is an organic flexible material membrane, and two sides of the organic flexible material membrane are respectively connected to the first supporting element 101 and the second supporting element 102 which are made of hard glue fiber composite boards, and specifically, the two sides of the organic flexible material membrane can be combined together in a hot pressing manner, a bonding manner, a welding manner, and an embedding manner, and can also be connected through a connecting mechanism. The organic flexible material membrane can realize the flexible and bendable function. The organic flexible material may include one or more of fluoro-rubber, silicone rubber, thermoplastic elastomer, polyvinyl chloride (PVC), Polyimide (PI), polyethylene terephthalate (PET), cyclo-olefin polymer (COP), Liquid Crystal Polymer (LCP), Polydimethylsiloxane (PDMS). The thermoplastic elastomer is an elastomer or a synthetic rubber, and the thermoplastic elastomer may specifically include one or more of Thermoplastic Polyurethane (TPU), thermoplastic polyester elastomer (TPEE), styrene thermoplastic elastomer, polyolefin thermoplastic elastomer (POE), polyether ester thermoplastic elastomer, and polyamide thermoplastic elastomer.
In the embodiment of the present application, the specific preparation method of the flexible screen support structure 100 having a structure composed of a ebonite fiber composite material-organic flexible material-ebonite fiber composite material is not limited, and for example, the flexible screen support structure can be prepared by the following steps:
step 301: taking a fiber layer, and impregnating hard glue materials on two side surfaces of the fiber layer by adopting a solvent impregnation method or a hot melting method to form a hard glue fiber single-layer prepreg; carrying out multi-angle multi-layer superposition on the single-layer prepreg of the ebonite fiber to obtain a laminated prepreg of the ebonite fiber;
step 302: taking an organic flexible material membrane with a target thickness, arranging the ebonite fiber laminated prepreg, the organic flexible material membrane and the ebonite fiber laminated prepreg side by side, and then performing hot pressing to obtain the flexible screen support structure 100.
In this embodiment, the flexible screen support structure 100 is a composite plate of a ebonite fiber composite-organic flexible material-ebonite fiber composite. The flexible screen support structure 100 is a flat plate-like or sheet-like structure as a whole.
In this embodiment, the structure of the joint between the hard rubber fiber composite plate 101 and the organic flexible material membrane 103 is not limited to the joint mode. The wire connection may be a wire connection as shown in fig. 10A, a tooth connection as shown in fig. 10B, 10C, and 10D, that is, a fitting connection, or a connection mechanism 104, for example, a snap connection, as shown in fig. 10E, for connecting both. The specific tooth shape of the tooth combination is not limited, and the tooth may be formed on the hard rubber fiber composite board 101 or on the organic flexible material membrane 103.
In the embodiment of the present application, the thickness of the flexible screen support structure 100 is 0.1mm to 2 mm. Specifically, it can be designed according to the actual requirements of the foldable terminal, and the larger the thickness is, the greater the support strength is. In some embodiments, the flexible screen support structure 100 has a thickness of 0.15mm to 0.2 mm. In other embodiments, the flexible screen support structure 100 has a thickness of 0.25mm to 0.8 mm. In other embodiments, the flexible screen support structure 100 has a thickness of 1mm to 2 mm. The flexible screen support structure 100 has a small thickness, which is beneficial to weight reduction and total thickness reduction of the foldable terminal, and can improve user experience.
The examples of the present application are further illustrated below in various examples.
Example 1
The flexible screen support structure of this embodiment is an epoxy resin continuous carbon fiber-polyurethane (TPU) continuous carbon fiber-epoxy resin continuous carbon fiber composite board, and taking a certain model of a folding mobile phone as an example, the design scheme of the flexible screen support structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.15mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the epoxy resin continuous carbon fiber composite plate, the polyurethane continuous carbon fiber composite plate and the epoxy resin continuous carbon fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting carbon fiber unidirectional cloth with the thickness of 0.02mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating according to a superposition angle of 0 degree/90 degrees/0 degree/90 degrees/0 degree to form an epoxy resin carbon fiber laminated prepreg with the thickness of 0.15 mm;
(2) the thickness of the carbon fiber cloth woven at 45 degrees is 0.1mm, the width of the carbon fiber cloth is 30mm, and the TPU continuous carbon fiber composite board with the thickness of 0.15mm is formed after the TPU is soaked.
(3) Sequentially arranging three materials of epoxy resin continuous carbon fiber laminated prepreg, polyurethane continuous carbon fiber composite board and epoxy resin continuous carbon fiber laminated prepreg side by side, wherein the polyurethane continuous carbon fiber composite board is crossed and connected with the epoxy resin continuous carbon fiber laminated prepreg parts on two sides; and (3) heating the hot press to 150 ℃, keeping the die gap at 0.15mm, and pressing for 30min at 150 ℃ to obtain the epoxy resin continuous carbon fiber-polyurethane (TPU) continuous carbon fiber-epoxy resin continuous carbon fiber composite board with the thickness of 0.15 mm.
(4) And (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is of the same size and is made of stainless steel materials, the flexible screen supporting structure prepared by the embodiment has the advantage that the weight is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, and the cracking problem does not occur. And in the bending process, the carbon fiber in the bending area can be stretched and deformed, because the carbon fiber is woven in the bending area at an angle of 45 degrees, the carbon fiber can be deformed in the bending process, and the displacement difference between the folding state and the unfolding state is absorbed.
Example 2
The flexible screen support structure of this embodiment is an epoxy resin continuous carbon fiber-TPU continuous carbon fiber-epoxy resin continuous carbon fiber composite board, and taking a certain model of a folding mobile phone as an example, the design scheme of the flexible screen support structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.15mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the epoxy resin continuous carbon fiber composite plate, the TPU continuous carbon fiber composite plate and the epoxy resin continuous carbon fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting carbon fiber unidirectional cloth with the thickness of 0.02mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating according to a superposition angle of 0 degree/90 degrees/0 degree/90 degrees/0 degree to form an epoxy resin carbon fiber laminated prepreg with the thickness of 0.15 mm;
(2) the TPU continuous carbon fiber composite board is formed by weaving 0 degree/90 degree carbon fiber cloth with the thickness of 0.1mm and the width of 30mm and infiltrating TPU.
(3) Sequentially arranging three plates of epoxy resin continuous carbon fiber laminated prepreg, TPU continuous carbon fiber composite plate and epoxy resin continuous carbon fiber laminated prepreg side by side, wherein the polyurethane continuous carbon fiber composite plate is crossed and connected with the epoxy resin continuous carbon fiber laminated prepreg parts on two sides; and (3) heating the hot press to 150 ℃, keeping the die gap at 0.15mm, and pressing at 150 ℃ for 30min to obtain the epoxy resin continuous carbon fiber-TPU continuous carbon fiber-epoxy resin continuous carbon fiber composite board with the thickness of 0.15 mm.
(4) And (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is made of stainless steel materials and has the same size, the weight of the flexible screen supporting structure prepared by the embodiment is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test. Compared with the first embodiment, the bending area of the flexible screen support structure of the present embodiment has continuous carbon fibers in the 0 ° direction, so that it is relatively difficult to absorb the displacement difference of flattening and bending.
Example 3
The flexible screen support structure of this embodiment is epoxy continuous carbon fiber-Polyimide (PI) -epoxy continuous carbon fiber composite sheet, and to take the folding cell-phone of a certain model as an example, the design scheme of the flexible screen support structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.15mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the epoxy resin continuous carbon fiber composite plate, the PI film and the epoxy resin continuous carbon fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting carbon fiber unidirectional cloth with the thickness of 0.03mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.05mm, and then laminating according to a superposition angle of 0 degree/90 degrees/0 degree to form an epoxy resin carbon fiber laminated prepreg with the thickness of 0.15 mm;
(2) preparing a piece of PI film with the width of 25mm and the thickness of 0.15 mm;
(3) arranging the epoxy resin carbon fiber laminated prepreg, the PI film and the epoxy resin carbon fiber laminated prepreg in parallel, wherein the PI film and the epoxy resin carbon fiber laminated prepreg are staggered by 2-5 mm;
(4) heating the hot press to 200 ℃, keeping the die gap at 0.15mm, and pressing at 200 ℃ for 20min to obtain an epoxy resin continuous carbon fiber-PI film-epoxy resin continuous carbon fiber composite plate with the thickness of 0.15 mm;
(5) and (5) trimming the composite board obtained in the step (4), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is of the same size and is made of stainless steel materials, the flexible screen supporting structure prepared by the embodiment has the advantage that the weight is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test. The flexible screen supporting structure of this embodiment, because the district of buckling is pure PI material, no fibre exists, compares flexible glue fibre combined material bendability better, nevertheless lacks the fibre network, and support intensity is slightly weak.
Example 4
The flexible screen support structure of this embodiment is a phenolic resin continuous glass fiber-TPU continuous glass fiber-phenolic resin continuous glass fiber composite board, and taking a certain model of a folding mobile phone as an example, the design scheme of the flexible screen support structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.2mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the phenolic resin continuous glass fiber composite plate, the TPU continuous glass fiber and the phenolic resin continuous glass fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting glass fiber unidirectional cloth with the thickness of 0.02mm, soaking phenolic resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating according to a superposition angle of 0 degree/90 degrees/0 degrees/90 degrees/0 degrees to form a phenolic resin glass fiber laminated prepreg with the thickness of 0.2 mm;
(2) the TPU continuous glass fiber composite board is formed by adopting 45-degree woven glass fiber cloth with the thickness of 0.15mm and the width of 30mm and soaking TPU.
(3) Sequentially arranging three plates of phenolic resin continuous glass fiber laminated prepreg, polyurethane continuous glass fiber composite plate and phenolic resin continuous glass fiber laminated prepreg side by side, wherein the polyurethane continuous glass fiber composite plate is crossed and connected with the phenolic resin continuous glass fiber laminated prepreg parts on two sides; and (3) heating the hot press to 150 ℃, keeping the die gap at 0.2mm, and pressing at 150 ℃ for 30min to obtain the phenolic resin continuous glass fiber-TPU continuous glass fiber-phenolic resin continuous glass fiber composite board with the thickness of 0.2 mm.
(4) And (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is made of stainless steel materials and has the same size, the weight of the flexible screen supporting structure prepared by the embodiment is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test.
Example 5
The flexible screen support structure of this embodiment is an epoxy resin continuous glass fiber-silicone rubber continuous glass fiber-epoxy resin continuous glass fiber composite board, and taking a certain model of a folding mobile phone as an example, the design scheme of the flexible screen support structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.2mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the epoxy resin continuous glass fiber composite plate, the silicone rubber continuous glass fiber and the epoxy resin continuous glass fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting glass fiber unidirectional cloth with the thickness of 0.02mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating according to a superposition angle of 0 degree/90 degrees/0 degrees/90 degrees/0 degrees to form an epoxy resin glass fiber laminated prepreg with the thickness of 0.2 mm;
(2) the glass fiber cloth woven at an angle of 45 degrees is adopted, the thickness is 0.15mm, the width is 30mm, and the silicon rubber continuous glass fiber composite board with the thickness of 0.2mm is formed after silicon rubber is soaked.
(3) Sequentially arranging three plates of epoxy resin continuous glass fiber laminated prepreg, silicone rubber continuous glass fiber composite plate and epoxy resin continuous glass fiber laminated prepreg side by side, wherein the silicone rubber continuous glass fiber composite plate is crossed and connected with the epoxy resin continuous glass fiber laminated prepreg parts on two sides; and (3) heating the hot press to 150 ℃, keeping the die gap at 0.2mm, and pressing at 150 ℃ for 30min to obtain the epoxy resin continuous glass fiber-silicone rubber continuous glass fiber-epoxy resin continuous glass fiber composite board with the thickness of 0.2 mm.
(4) And (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is made of stainless steel materials and has the same size, the weight of the flexible screen supporting structure prepared by the embodiment is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test.
Example 6
The flexible screen support structure of this embodiment is a phenolic resin continuous glass fiber-silicone rubber continuous glass fiber-phenolic resin continuous glass fiber composite board, and taking a certain model of a folding mobile phone as an example, the design scheme of the flexible screen support structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.2mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the phenolic resin continuous glass fiber composite plate, the silicone rubber continuous glass fiber and the phenolic resin continuous glass fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting glass fiber unidirectional cloth with the thickness of 0.02mm, soaking phenolic resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating according to a superposition angle of 0 °/-45 °/+45 °/0 °/0 °/+45 °/-45 °/0 ° to form a phenolic resin glass fiber laminated prepreg with the thickness of 0.2 mm;
(2) the TPU continuous glass fiber composite board with the thickness of 0.2mm is formed by soaking 45-degree woven glass fiber cloth with the thickness of 0.15mm and the width of 30mm in silicon rubber.
(3) Sequentially arranging three plates of phenolic resin continuous glass fiber laminated prepreg, silicone rubber continuous glass fiber composite plate and phenolic resin continuous glass fiber laminated prepreg side by side, wherein the silicone rubber continuous glass fiber composite plate is crossed and connected with the phenolic resin continuous glass fiber laminated prepreg parts on two sides; and (3) heating the hot press to 150 ℃, keeping the die gap at 0.2mm, and pressing at 150 ℃ for 30min to obtain the phenolic resin continuous glass fiber-silicone rubber continuous glass fiber-phenolic resin continuous glass fiber composite board with the thickness of 0.2 mm.
(4) And (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is made of stainless steel materials and has the same size, the weight of the flexible screen supporting structure prepared by the embodiment is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test.
Example 7
The flexible screen supporting structure of this embodiment is a composite board of epoxy resin continuous aramid fiber-polyurethane (TPU) continuous aramid fiber-epoxy resin continuous aramid fiber, and takes a certain model of folding mobile phone as an example, and the design scheme of the flexible screen supporting structure of this embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.15mm, and the width that flexible region can buckle the connecting piece is 20mm, and both sides support piece's width is 63 mm. The three plates of the epoxy resin continuous aramid fiber composite plate, the polyurethane continuous aramid fiber composite plate and the epoxy resin continuous aramid fiber composite plate are sequentially arranged side by side and combined together to form the flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting aramid fiber unidirectional cloth with the thickness of 0.02mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating according to a laminating angle of 0 °/+45 °/-45 °/+45 °/0 ° to form an epoxy resin aramid fiber laminated prepreg with the thickness of 0.15 mm;
(2) the TPU continuous aramid fiber composite board is formed by adopting 45-degree woven aramid fiber cloth, wherein the thickness of the aramid fiber cloth is 0.1mm, the width of the aramid fiber cloth is 30mm, and the TPU continuous aramid fiber composite board with the thickness of 0.15mm is formed after the TPU is soaked.
(3) Sequentially arranging three plates of epoxy resin continuous aramid fiber laminated prepreg, polyurethane continuous aramid fiber composite plate and epoxy resin continuous aramid fiber laminated prepreg side by side, wherein the polyurethane continuous aramid fiber composite plate and the epoxy resin continuous aramid fiber laminated prepreg parts on two sides are connected in a cross mode; and heating the hot press to 150 ℃, keeping the die gap at 0.15mm, and pressing for 30min at 150 ℃ to obtain the epoxy resin continuous aramid fiber-polyurethane (TPU) continuous aramid fiber-epoxy resin continuous aramid fiber composite board with the thickness of 0.15 mm.
(4) And (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is made of stainless steel materials and has the same size, the weight of the flexible screen supporting structure prepared by the embodiment is reduced by more than 75%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test.
Example 8
The flexible screen support structure of this embodiment is an epoxy continuous carbon fiber-stainless steel-epoxy continuous carbon fiber composite board. Taking a certain model of folding mobile phone as an example, the design scheme of the flexible screen support structure of the embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.15mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the epoxy resin continuous carbon fiber composite plate, the stainless steel sheet and the epoxy resin continuous carbon fiber composite plate are sequentially arranged side by side and combined together, and the two sides of the stainless steel sheet are respectively embedded into the epoxy resin continuous carbon fiber composite plate structures on the two sides to form a flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting carbon fiber unidirectional cloth with the thickness of 0.02mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating the single-layer prepreg according to a superposition angle of 0 degree/90 degrees/0 degrees/90 degrees/0 degrees to form an epoxy resin carbon fiber laminated prepreg with the thickness of 0.15 mm;
(2) preparing a porous stainless steel sheet with the width of 30mm and the thickness of 0.15mm, wherein the middle porous region (as a flexible bendable region) is 20mm, and the left side and the right side of the sheet are descended to form a step structure with the thickness of 0.05mm and the width of 5mm as an embedding part (holes can be punched on the embedding part);
(3) arranging the epoxy resin carbon fiber laminated prepreg, the porous stainless steel sheet and the epoxy resin carbon fiber laminated prepreg in sequence side by side, wherein the two sides of the porous stainless steel sheet and the epoxy resin carbon fiber laminated prepreg respectively have a bonding area with the width of 5 mm; heating the hot press to 150 ℃, keeping the die gap at 0.15mm, and pressing at 150 ℃ for 30min to obtain an epoxy resin continuous carbon fiber-stainless steel-epoxy resin continuous carbon fiber composite plate with the thickness of 0.15 mm;
(4) and (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is made of stainless steel materials and has the same size, the weight of the flexible screen supporting structure prepared by the embodiment is reduced by more than 62%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test.
Example 9
The flexible screen support structure of this embodiment is an epoxy continuous glass fiber-titanium alloy-epoxy continuous glass fiber composite board. Taking a certain model of folding mobile phone as an example, the design scheme of the flexible screen support structure of the embodiment is as follows: the overall dimension of flexible screen bearing structure is 161mm 146mm, and thickness is 0.15mm, and the width that the connecting piece can be buckled in flexible bendable region is 20mm, and the width of both sides support piece is 63 mm. The three plates of the epoxy resin continuous carbon fiber composite plate, the titanium alloy sheet and the epoxy resin continuous carbon fiber composite plate are sequentially arranged side by side and combined together, and two sides of the titanium alloy sheet are respectively embedded into the epoxy resin continuous carbon fiber composite plate structures on two sides to form a flexible screen supporting structure.
The preparation process of the flexible screen support structure of the embodiment is as follows:
(1) selecting carbon fiber unidirectional cloth with the thickness of 0.02mm, soaking epoxy resin on the surfaces of two sides to obtain a single-layer prepreg with the thickness of 0.025mm, and then laminating the single-layer prepreg according to a superposition angle of 0 degree/90 degrees/0 degrees/90 degrees/0 degrees to form an epoxy resin carbon fiber laminated prepreg with the thickness of 0.15 mm;
(2) preparing a porous titanium alloy sheet with the width of 30mm and the thickness of 0.15mm, wherein the middle porous region (as a flexible bendable region) is 20mm, the left side and the right side of the porous titanium alloy sheet are descended, and a step structure with the thickness of 0.05mm and the width of 5mm is formed to be used as an embedding part (holes can be punched on the embedding part);
(3) sequentially arranging the epoxy resin carbon fiber laminated prepreg, the porous titanium alloy sheet and the epoxy resin carbon fiber laminated prepreg side by side, wherein the two sides of the porous titanium alloy sheet and the epoxy resin carbon fiber laminated prepreg respectively have a bonding area with the width of 5 mm; heating the hot press to 150 ℃, keeping the die gap at 0.15mm, and pressing at 150 ℃ for 30min to obtain an epoxy resin continuous carbon fiber-titanium alloy-epoxy resin continuous carbon fiber composite plate with the thickness of 0.15 mm;
(4) and (4) trimming the composite board obtained in the step (3), and cutting into required overall dimension.
Compared with the flexible screen supporting structure which is of the same size and is made of stainless steel materials, the flexible screen supporting structure prepared by the embodiment has the advantage that the weight is reduced by more than 70%. Meanwhile, the flexible screen supporting structure prepared by the embodiment is subjected to bending test for 20 ten thousand times, the cracking problem is avoided, and better flatness can be still kept after the test.
According to the flexible screen supporting structure, the composite material of the organic material and the fiber is used as the main material, so that compared with the existing flexible screen supporting structure made of all metal materials such as stainless steel, the weight is greatly reduced, and good rigid support can be provided for the flexible screen; meanwhile, the bending area can be made of metal materials, and can also be made of organic flexible materials and soft rubber fiber composite materials, so that the bending reliability is guaranteed, the total weight of the supporting structure is further reduced, the weight of a folding terminal product is reduced, the product competitiveness is improved, and the user experience is improved; in addition, the flexible screen supporting structure is low in manufacturing cost.

Claims (20)

1. The utility model provides a composite construction, its characterized in that, is in including first support piece, the second support piece that sets up side by side, and set up first support piece with between the second support piece, and with first support piece with the connector of can buckling that the second support piece is connected, first support piece with the material of second support piece includes ebonite fibre combined material, ebonite fibre combined material includes at least one deck fibre layer, and the solidification is in ebonite material on the fibre layer.
2. The composite structure of claim 1 wherein said fibrous layer comprises a unidirectional cloth of fibers and/or a woven cloth of fibers.
3. The composite structure of claim 1, wherein the ebonite material comprises a hard resin and/or a hard rubber.
4. The composite structure of claim 3, wherein the hardcoat material comprises one or more of an epoxy, a phenolic, an amino resin, an unsaturated polyester, a silyl ether resin, a polyolefin, a polyamide, a polyoxymethylene, a polycarbonate, a polyphenylene oxide, a polysulfone.
5. The composite structure of claim 1, wherein the fibrous layer comprises one or more of glass fibers, carbon fibers, aramid fibers, alumina fibers, ultra high molecular weight polyethylene fibers, and poly-p-phenylene benzobisoxazole fibers.
6. The composite structure of claim 1, wherein the mass content of fibers in the ebonite fiber composite is between 10% and 80%.
7. The composite structure according to any one of claims 1 to 6, wherein the ebonite fiber composite comprises a plurality of said fiber layers forming a composite laminate with alternating layers of fiber and ebonite with the ebonite material; or a plurality of fiber layers are stacked to form a fiber stacking body, and the hard glue material is solidified on the fiber stacking body.
8. The composite structure of any of claims 1-7, wherein the bendable connector comprises one or more of an organic flexible material, a soft gel fiber composite material, and a bendable metal material.
9. The composite structure of claim 8, wherein the organic flexible material comprises one or more of a fluoroelastomer, a silicone rubber, a thermoplastic elastomer, a polyvinyl chloride, a polyimide, a polyethylene terephthalate, a cyclic olefin polymer, a liquid crystal polymer, a polydimethylsiloxane.
10. The composite structure of claim 8 wherein said soft gel fiber composite comprises at least one layer of said fiber layer, and a soft gel material cured on said fiber layer; the soft rubber material comprises one or more of fluororubber, silicon rubber and thermoplastic elastomer.
11. The composite structure of claim 8 or 10, wherein the mass content of the fibers in the soft gel fiber composite material is 10% to 80%.
12. The composite structure of claim 8, wherein the soft gel fiber composite comprises a plurality of fiber layers that form a composite laminate with fibers and soft gels alternately stacked with the soft gel material; or a plurality of fiber layers are laminated to form a fiber laminated body, and the soft glue material is solidified on the fiber laminated body.
13. The composite structure of claim 8 wherein said bendable metallic material comprises one or more of stainless steel, titanium alloy and aluminum alloy.
14. The composite structure of claim 8 wherein when the bendable connector is a soft gel fiber composite, the composite structure includes an integrally woven fiber layer continuously present in the first support member, the second support member and the bendable connector.
15. The composite structure according to any one of claims 1 to 14, wherein the composite structure has a thickness of from 0.1mm to 2 mm.
16. The composite structure according to any one of claims 1 to 15, wherein the first support member, the bendable connecting member, and the second support member are bonded together by heat pressing, gluing, welding, or fitting.
17. A terminal, characterized in that the terminal comprises a composite structure according to any one of claims 1-16.
18. A flexible screen assembly comprising a flexible screen and a flexible screen support structure, the flexible screen support structure being formed from a composite structure according to any one of claims 1 to 16.
19. A foldable terminal, characterized in that the foldable terminal comprises a flexible screen assembly according to claim 18.
20. The foldable terminal of claim 19, wherein the flexible screen comprises a bending region and non-bending regions at both sides of the bending region, and the flexible screen support structure is disposed at an outer surface of the flexible screen, wherein the first support member and the second support member correspond to the non-bending regions at both sides of the flexible screen, respectively, and the bendable connector corresponds to the bending region of the flexible screen.
CN202011573085.4A 2020-12-24 2020-12-24 Composite structure, flexible screen assembly and foldable terminal Pending CN114664180A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115116338A (en) * 2022-07-25 2022-09-27 湖北长江新型显示产业创新中心有限公司 Support piece, display module and display device
CN117153042A (en) * 2023-01-13 2023-12-01 荣耀终端有限公司 Folding screen device and method for manufacturing fiber composite board
WO2024016672A1 (en) * 2022-07-20 2024-01-25 武汉华星光电半导体显示技术有限公司 Display module and terminal device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024016672A1 (en) * 2022-07-20 2024-01-25 武汉华星光电半导体显示技术有限公司 Display module and terminal device
CN115116338A (en) * 2022-07-25 2022-09-27 湖北长江新型显示产业创新中心有限公司 Support piece, display module and display device
CN117153042A (en) * 2023-01-13 2023-12-01 荣耀终端有限公司 Folding screen device and method for manufacturing fiber composite board

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