CN112469562A

CN112469562A - Flexible composite film, preparation method thereof and display device

Info

Publication number: CN112469562A
Application number: CN201880093826.3A
Authority: CN
Inventors: 甘舟; 施文杰
Original assignee: Shenzhen Royole Technologies Co Ltd
Current assignee: Shenzhen Royole Technologies Co Ltd
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2021-03-09
Also published as: WO2020006684A1

Abstract

The invention provides a flexible composite film (1), a preparation method thereof and a display device. The flexible composite film (1) comprises a flexible functional layer (10) and a thermal barrier layer (20) formed on the flexible functional layer (10), wherein the flexible functional layer (10) comprises a flexible base material (101) and a functional material (102) with heat conduction, heat dissipation and electromagnetic shielding functions. By integrating the base material (101) and the functional material (102) with the functions of heat conduction, heat dissipation and electromagnetic shielding, the thinned flexible functional layer (10) with the functions of heat conduction, heat dissipation and electromagnetic shielding is manufactured, and the manufacturing process is simple.

Description

Flexible composite film, preparation method thereof and display device

Technical Field

The invention relates to the technical field of display, in particular to a flexible composite film, a preparation method thereof and a display device.

Background

With the development of display technology, consumers have increasingly diversified and personalized demands for display modes, display effects and the like of display devices. In a conventional flexible display device, a support film and a composite film having functions of heat dissipation, electromagnetic shielding, and the like are generally provided on one side surface of a flexible substrate. However, the multiple laminated layers of the composite film and the supporting film need to be sequentially attached, so that the preparation process is complex, and the flexible display device is not easy to thin.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides a thin flexible composite film with a simple manufacturing process and a method for manufacturing the same.

In addition, the invention also provides a display device applying the flexible composite film.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

in a first aspect, the present invention provides a flexible composite film comprising a flexible functional layer including a flexible base material and a functional material having heat conducting, heat dissipating, and electromagnetic shielding functions.

In a second aspect, the present invention also provides a method for preparing a flexible composite film, comprising the following steps: and mixing and laminating the flexible base material and the functional material with the functions of heat conduction, heat dissipation and electromagnetic shielding to prepare the flexible functional layer.

In a third aspect, the present invention also provides another method for preparing a flexible composite film, comprising the steps of:

providing a flexible substrate;

preparing a functional material layer, wherein the functional material layer comprises functional materials with heat conduction, heat dissipation and electromagnetic shielding functions;

and pressing the flexible substrate and the functional material layer to obtain the flexible functional layer.

In a fourth aspect, the present invention further provides a display device, including the above flexible composite film and a display structure, where the flexible composite film and the display structure are stacked.

According to the flexible composite film, the preparation method and the display device, the substrate material and the functional material with the heat conduction, heat dissipation and electromagnetic shielding functions are integrated to prepare the thin flexible functional layer with the heat conduction, heat dissipation and electromagnetic shielding functions, and the preparation process is simple.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a flexible composite film according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a flexible functional film of the flexible composite film of fig. 1.

Fig. 3 is a schematic structural diagram of a flexible composite film according to a second embodiment of the present invention.

Fig. 4 is a schematic structural view of a first embodiment of a flexible functional film of the flexible composite film in fig. 3.

Fig. 5 is a schematic structural view of a second embodiment of a flexible functional film of the flexible composite film in fig. 3.

Fig. 6 is a schematic structural view of a third embodiment of a flexible functional film of the flexible composite film in fig. 3.

Fig. 7 is a flow chart of a method of preparing the flexible composite film of fig. 1.

Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, elements, components, and/or groups thereof. The following description is of the preferred embodiment for carrying out the invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.

Referring to fig. 1 and fig. 2, a flexible composite film according to a first embodiment of the present invention is shown. The flexible composite film 1 includes a flexible functional layer 10. The flexible functional layer 10 comprises a flexible base material 101 and a functional material 102 having heat conducting, heat dissipating and electromagnetic shielding functions.

In the present embodiment, the flexible functional layer 10 has a single-layer structure. The flexible substrate material 101 is, for example, but not limited to, one of polyethylene terephthalate (PET), Polyimide (PI), Polycarbonate (PC), Colorless transparent Polyimide (CPI), polyethylene terephthalate (PET), Polyamide (PA), Polyethersulfone (PES), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), Cyclic Olefin Copolymer (COC), Cyclic Olefin Polymer (COP), or a combination thereof. The functional material 102 is, for example, but not limited to, one of a metal material, a carbon material coated with a metal material, a fiber material coated with a metal material, or a combination thereof. The metal material is, for example, but not limited to, copper, aluminum, or nickel.

As shown in fig. 1 and fig. 2, in the present embodiment, the flexible functional layer 10 is formed by mixing and pressing a flexible substrate material 101 and a functional material 102. The functional material 102 is, for example, but not limited to, one of chopped fibers 103, micro-nano particles 104, or a combination thereof. According to the embodiment of the invention, the flexible base material 101 and the functional material 102 are mixed, so that the functional material 102 can be uniformly distributed in the flexible composite film 1, the flexible composite film 1 has the functions of heat dissipation and electromagnetic shielding, and the attaching times of all functional film layers are reduced, so that the production yield is increased. In addition, because the flexible substrate material 101 has a soft texture and the functional material 102 has a hard texture, the overall texture of the flexible composite film 1 is relatively stiff, and therefore the flexible composite film 1 still has high strength and hardness when the thickness is reduced, thereby avoiding the problems of large thickness of the flexible substrate, low bonding yield, increased material usage and the like caused by the fact that the flexible composite film 1 is bonded with the support film by adopting a multilayer composite film to improve the overall strength and hardness.

Optionally, in order to ensure that the flexible composite film 1 has high hardness and strength and good bending performance, the weight ratio of the flexible base material 101 to the functional material 102 is 1: 0.5-1: 500.

It can be understood that, because the flexible functional layer 10 is formed by mixing and pressing the flexible substrate material 101 and the functional material 102, compared with the structure of stacking multiple layers of film materials in the prior art, the overall thickness of the flexible composite film 1 is reduced, and the flexibility of the flexible composite film 1 is further improved. In addition, the materials used by the flexible composite film 1 are correspondingly reduced, so that the materials can be saved, and the production cost is reduced. In the present embodiment, the thickness of the flexible composite film 1 is approximately 55 μm to 300 μm, and the thickness of the flexible functional layer is approximately 50 μm to 300 μm.

Further, in the present embodiment, the flexible composite film 1 further includes a thermal barrier layer 20. A thermal barrier layer 20 is disposed on the flexible functional layer 10. It will be appreciated that the thermal barrier layer 20 has a bi-directional thermal insulating function. Specifically, the thermal barrier layer 20 may be formed on the flexible functional layer 10 by coating or attaching. Optionally, a hollow gap structure 201 is disposed inside the thermal barrier layer 20 to effectively block an external heat source, so as to enhance the uniform heat dissipation function of the whole flexible functional layer 10.

The periphery of the flexible functional layer 10 is divided into an area a1 with an external heat source and an area a2 without an external heat source. The area a1 of the external heat source is an area where a heat generating element such as an IC chip (Integrated Circuit) or a Central Processing Unit (CPU) is provided. Alternatively, since the display structure has a high temperature in a region near the heat generating element (e.g., IC chip) to affect the service life of the display structure, the thermal barrier layer 20 is preferably disposed in the region a1 having an external heat source around the flexible functional layer 10, so that the heat emitted from the heat generating element cannot be directly guided to the display structure, thereby avoiding a problem that the temperature of the display structure is sharply increased due to the excessively concentrated guidance of the heat emitted from the heat generating element to the display structure. The area a2 that does not have the external heat source around flexible functional layer 10 does not set up heat barrier layer 20 to the heat that heating element gived off can be derived through the flexible composite film 1 that does not set up heat barrier layer 20, consequently, the heat barrier layer 20 of this application not only can effectively obstruct external heat source, and realizes the directional heat dissipation function of flexible composite film 1.

Optionally, to avoid heat build-up on the flexible functional layer 10, the surface area of the flexible functional layer 10 is larger than the surface area of the thermal barrier layer 20. The thermal barrier layer 20 is a thin film structure. In the present embodiment, the thickness of the thermal barrier layer 20 is approximately 5 μm to 100 μm in order to reduce the overall thickness of the flexible composite film 1. Optionally, the thermal barrier layer 20 includes an oxide of a metal such as mullite, aluminum, yttrium, zirconium, or a combination thereof. In other embodiments, silicate aerogel or silica aerogel may be included in the thermal barrier layer 20.

As shown in fig. 3 to 6, a flexible composite film 1a according to a second embodiment of the present invention is provided. In the second embodiment, the structure of the flexible composite film 1a is similar to the structure of the flexible composite film 1 in the first embodiment, and therefore, the sizes, names, components, positional relationships, and the like of the elements included in the flexible composite film 1a can be referred to the flexible composite film 1, and the details thereof are not repeated. The difference is that the flexible functional layer 10a comprises a flexible substrate 11 and a functional material layer 12, and the flexible functional layer 10a is formed by laminating the flexible substrate 11 and the functional material layer 12.

In the present embodiment, the flexible substrate 11 is a plastic substrate. The flexible substrate 11 is made of a transparent material. The flexible substrate material 101 is suitable for transparent materials, and will not be described in detail herein. In order to ensure the stiffness and the bending property of the flexible composite film 1, the thickness of the flexible base material 11 is 50 μm to 300 μm, and the thickness of the functional material layer 12 is 5 μm to 100 μm. In the present embodiment, the thickness of the flexible substrate 11 accounts for 10% to 70% of the thickness of the flexible composite film 1. The thermal barrier layer 20 is arranged on the side of the flexible functional layer 10 facing away from the flexible substrate 11 and is arranged in an area a1 around the flexible functional layer 10 having an external heat source.

In the first embodiment, the functional material layer 12a is sheet-shaped. The functional material layer 12a is disposed in a stacked manner with the flexible substrate 11, that is, the functional material layer 12a covers the flexible substrate 11. In the second embodiment, the functional material layer 12b is in a grid shape. In the third embodiment, the functional material layers 12c are in a unidirectional fiber shape, that is, two adjacent functional material layers 12c are parallel. It is understood that, in order to ensure the flexible composite film 1a to have high stiffness and strength and to have good bending properties, the fiber diameters of the

functional material layers

12b, 12c are about 5 μm to 100 μm.

Fig. 7 is a flowchart illustrating a method for manufacturing a flexible composite film according to an embodiment of the present invention. The preparation method of the flexible composite film 1 comprises the following steps:

s701, preparing a flexible functional layer, wherein the flexible functional layer comprises a flexible base material and a functional material with heat conduction, heat dissipation and electromagnetic shielding functions;

and S703, forming a thermal barrier layer on the flexible functional layer.

Preparing a flexible functional layer, specifically comprising:

mixing and pressing the flexible base material and the functional material with the functions of heat conduction, heat dissipation and electromagnetic shielding.

The functional material comprises one of chopped fibers, micro-nano particles or a combination of the chopped fibers and the micro-nano particles.

Preparing a flexible functional layer, specifically comprising:

providing a flexible substrate;

preparing a functional material layer;

The functional material layer is in a sheet shape, a grid shape or a unidirectional fiber shape.

In this embodiment, the forming the thermal barrier layer on the flexible functional layer specifically includes:

preparing glue solution containing a thermal barrier layer material;

and coating the glue solution on the flexible functional layer to form a thermal barrier layer on the flexible functional layer.

Optionally, in other embodiments, the glue solution may be pre-coated on the substrate to obtain a thermal barrier film, and then the thermal barrier film is attached to the flexible functional layer. Further, in this embodiment, adopt vacuum apparatus to set the inside of thermal barrier layer to hollow void structure at the in-process of preparation thermal barrier layer to effective separation external heat source, thereby strengthen the even heat dissipation function of whole flexible functional layer.

Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention. The display device 100 includes the above-described flexible composite film 1 and the display structure 2. The flexible composite film 1 and the display structure 2 are stacked, and the display structure 2 is formed above the flexible composite film 1. The display device 100 further comprises a chassis 3, and the flexible

functional layer

10, 10a is overlapped on the chassis 3 to further increase the heat dissipation area.

The display device 100 further includes a heat generating element 4. The heating element 4 is disposed in the area a1 where the flexible

functional layer

10, 10a has a heat source, that is, the thermal barrier layer 20 is disposed between the heating element 4 and the flexible

functional layer

10, 10a, so as to prevent the heat emitted from the heating element 4 from being directly guided to the display structure 2, and further prevent the display structure 2 from being affected by the over-high temperature at the heating element 4 and the service life of the display structure 2.

In the present embodiment, the display device 100 is, for example, a flexible touch screen or a flexible display device. Examples of the flexible Display device include, but are not limited to, products or components having a Display function, such as a Liquid Crystal Display (LCD) panel, a Quantum Dot Display (QLED) panel, an electronic paper (E-paper Display, EPD), a Touch panel (Touch panel), a flexible solar cell (PV) panel, and a Radio Frequency tag (RFID).

According to the flexible composite film, the preparation method and the display device, the substrate material and the functional material with the heat conduction, heat dissipation and electromagnetic shielding functions are integrated to prepare the thin flexible functional layer with the heat conduction, heat dissipation and electromagnetic shielding functions, the preparation process is simple, and the attachment yield is improved. Further, a thermal barrier layer is prepared on the flexible functional layer, so that conduction from an external heat source to the display structure can be avoided. In addition, the flexible substrate material is combined with the functional material, so that the display device has higher hardness and strength, and the user experience is further improved.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

A flexible composite film is characterized by comprising a flexible functional layer, wherein the flexible functional layer comprises a flexible base material and a functional material with heat conduction and electromagnetic shielding functions.
The flexible composite film according to claim 1, wherein the functional material comprises one of a metal material, a carbon material coated with the metal material, a fiber material coated with the metal material, or a combination thereof.
The flexible composite film according to claim 1, wherein the flexible substrate material comprises one of polyethylene terephthalate, polyimide, colorless transparent polyimide, polycarbonate, polyethylene terephthalate, polyamide, polyphenylene ether sulfone, polyethylene naphthalate, polymethyl methacrylate, cyclic olefin copolymer, cyclic olefin polymer, or a combination thereof.
The flexible composite film according to claim 1, further comprising a thermal barrier layer disposed on the flexible functional layer.
The flexible composite film of claim 4, wherein the thermal barrier layer is disposed on a side of the flexible functional layer facing away from the flexible substrate, and wherein the thermal barrier layer is disposed in an area around the flexible functional layer having an external heat source.
The flexible composite film of claim 4 wherein the flexible functional layer has a surface area greater than a surface area of the thermal barrier layer.
The flexible composite film of claim 4 wherein the thermal barrier layer comprises an oxide of a metal.
The flexible composite film according to claim 4, wherein the thermal barrier layer has a hollow void structure provided therein.
The flexible composite film according to claim 1 wherein the flexible functional layer is formed by mixing and pressing the flexible substrate material and the functional material.
The flexible composite film according to claim 9, wherein the functional material comprises one of chopped fibers, micro-nano particles or a combination thereof.
The flexible composite film according to claim 1, wherein the flexible substrate material and the functional material are respectively formed in two layers, and the flexible functional layer is formed by laminating the flexible substrate and the functional material layer.
The flexible composite film according to claim 11, wherein the functional material layer is in a sheet, a mesh, or a unidirectional fiber form.
A preparation method of a flexible composite film comprises the following steps:

and mixing and laminating the flexible base material and the functional material with the functions of heat conduction, heat dissipation and electromagnetic shielding to prepare the flexible functional layer.
The method of claim 13, wherein the functional material comprises one of chopped fiber, micro-nano particles or a combination thereof.
The method of manufacturing a flexible composite film according to claim 13, further comprising: forming a thermal barrier layer on the flexible functional layer.
A preparation method of a flexible composite film is characterized by comprising the following steps:

providing a flexible substrate;

preparing a functional material layer, wherein the functional material layer comprises functional materials with heat conduction, heat dissipation and electromagnetic shielding functions;

and pressing the flexible substrate and the functional material layer to obtain the flexible functional layer.
The method of claim 16, wherein the functional material layer is in the form of a sheet, a mesh, or a unidirectional fiber.
The method of preparing a flexible composite film according to claim 16, wherein the method of preparing a flexible composite film further comprises: forming a thermal barrier layer on the flexible functional layer.
A display device comprising the flexible composite film according to any one of claims 1 to 12 and a display structure, the flexible composite film and the display structure being arranged in a stack, the flexible composite film comprising a flexible functional layer.
The display device of claim 19, further comprising a chassis, wherein the flexible functional layer overlaps the chassis.