CN109032418A - A kind of flexible touch screen and preparation method thereof - Google Patents
A kind of flexible touch screen and preparation method thereof Download PDFInfo
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- CN109032418A CN109032418A CN201810908243.3A CN201810908243A CN109032418A CN 109032418 A CN109032418 A CN 109032418A CN 201810908243 A CN201810908243 A CN 201810908243A CN 109032418 A CN109032418 A CN 109032418A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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Abstract
The embodiment of the present invention provides a kind of flexible touch screen and preparation method thereof, flexible touch screen includes: that flexible touch screen includes: the first flexible conductive layer, polymer barrier layer and the second flexible conductive layer, wherein, first flexible conductive layer includes: first flexible substrate, the first area of the lower surface of first flexible substrate is provided with conductive metal, and the second area of first flexible substrate is provided with the graphene film with the first predetermined pattern；Polymer barrier layer is set to the lower section of the first flexible conductive layer and the top of the second flexible conductive layer, and is fitted and connected respectively with the first flexible conductive layer and the second flexible conductive layer；Second flexible conductive layer includes: second flexible substrate, and the first area of the upper surface of second flexible substrate is provided with conductive metal, and the second area of second flexible substrate is provided with the graphene film with the second predetermined pattern.In this way, can be realized flexible touch screen by flexible base board and graphene film.
Description
Technical field
The present embodiments relate to touch screen fields more particularly to a kind of flexible touch screen and preparation method thereof.
Background technique
With the development of internet and electronic equipment and universal, user can click on the touchscreen by finger,
The touch operations such as double-click, pressing, sliding, easily to be interacted with electronic equipment.
In touch screen structure, transparent conductive film is essential touch sensing unit, and effect is to generate touch-control
Signal, while guaranteeing that certain light transmittance allows users to see display object clearly.Currently, being realized usually using oxidation cigarette tin thin film
Transparent conductive film, still, oxidation cigarette tin thin film are very crisp frangible, are easy to be worn or in bending in user's use process
Cracked, the problems such as falling off, and influence the service life of touch screen.
During realizing above-mentioned touch screen by oxidation cigarette tin thin film, inventor has found that existing touch screen is non-soft
Property, there is a problem of that easy to damage, service life is shorter, durability is poor.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of flexible touch screen and preparation method thereof, main purpose is to pass through
Graphene film and flexible base board form flexible touch screen, can improve the pliability of touch screen, enable touch screen can
It folds flexible, improves the service life of touch screen.
In order to achieve the above objectives, the embodiment of the present invention mainly provides the following technical solutions:
In a first aspect, the embodiment of the present invention provides a kind of flexible touch screen, the flexible touch screen includes: that the first flexibility is led
Electric layer, polymer barrier layer and the second flexible conductive layer；Wherein, first flexible conductive layer includes: first flexible substrate,
The first area of the lower surface of the first flexible substrate is provided with conductive metal, and the second area of the first flexible substrate is set
It is equipped with the graphene film with the first predetermined pattern；The polymer barrier layer is set to first flexible conductive layer
Lower section and the top of second flexible conductive layer, and led respectively with first flexible conductive layer and second flexibility
Electric layer is fitted and connected；Second flexible conductive layer includes: second flexible substrate, and the of the upper surface of the second flexible substrate
One region is provided with conductive metal, and the second area of the second flexible substrate is provided with the graphene with the second predetermined pattern
Film.
In embodiments of the present invention, the flexible touch screen further include: the first flexible circuit board and the second flexible circuit board,
Wherein, first flexible circuit board is fitted and connected with the graphene film with the first predetermined pattern, and described second is soft
Property circuit board is fitted and connected with the graphene film with the second predetermined pattern.
In embodiments of the present invention, the flexible touch screen further include: the first flexible cover plate, the first OCA optical adhesive layer,
Two flexible cover plates and the 2nd OCA optical adhesive layer, wherein first flexible cover plate is set to the upper of the first flexible substrate
Side, and be fitted and connected by the upper surface of the first OCA optical adhesive layer and the first flexible substrate；Second flexible cover
Plate is set to the lower section of the second flexible substrate, and passes through the 2nd OCA optical adhesive layer and the second flexible substrate
Lower surface is fitted and connected.
In embodiments of the present invention, first flexible cover plate and the second flexible cover plate are by polyethylene terephthalate
One of ester, polyimides and polyethylene naphthalate material is made；The first OCA optical adhesive layer and described second
OCA optical adhesive layer with a thickness of 20~40um.
In embodiments of the present invention, the visible light transmittance of the graphene film is greater than 88%；The graphene film
Thin layer be averaged square resistance less than 400 Ω/；The polymer barrier layer by flexible high molecular polymer particle
It is formed；The first flexible substrate and second flexible substrate are by polyethylene terephthalate, polyimides and poly- naphthalene diformazan
One of sour glycol ester material is made.
Second aspect, the embodiment of the present invention provide a kind of preparation method of above-mentioned flexible touch screen, which comprises system
Standby flexible conductive layer, wherein the flexible conductive layer includes the first flexible conductive layer and the second flexible conductive layer；Polymer is hindered
Interlayer is set to the lower section of first flexible conductive layer, and is fitted and connected with first flexible conductive layer；By described second
Flexible conductive layer is set to the lower section of the polymer barrier layer, and is fitted and connected with the polymer barrier layer.
In embodiments of the present invention, described to prepare flexible conductive layer, comprising: by chemical vapour deposition technique, in metal foil
Upper growth graphene film；Flexible base board is pre-processed, wherein the flexible base board includes first flexible substrate and second
Flexible base board；Transfer technique is pressed by hot-rolling, it is flexible that the graphene film is transferred to treated from the metal foil
On the second area of substrate；By electron beam lithography, electronics is carried out to the graphene film on the flexible base board after transfer
The processing of beam lithographic patterning, forms the graphene film with predetermined pattern, wherein the graphene film packet of the predetermined pattern
Include one of graphene film and the graphene film of the second predetermined pattern of the first predetermined pattern；Pass through silk-screen printing skill
Art, by the first area of the flexible base board after the corresponding metal paste silk-screen to electron beam lithography of conductive metal, described in acquisition
Flexible conductive layer.
In embodiments of the present invention, described by chemical vapour deposition technique, it is thin to form graphene for growth on metal foil
When film, growth temperature is 800~1050 DEG C, and growth air pressure is 50Pa or less；The metal foil is rolled copper foil, and the calendering
Copper foil with a thickness of 25um；The visible light transmittance of the graphene film is greater than 88%；The thin layer of the graphene film is flat
Equal square resistance is less than 400 Ω/；Transfer technique is pressed by hot-rolling described, by the graphene film from the metal foil
On the flexible base board that is transferred to that treated second area on when, transfer pressure is 1.5~4kg/cm2, upper roll wheel and lower roll wheel
Transmission speed be 0.2~0.8m/min, transfer temperature be 115~135 DEG C；Described by electron beam lithography, to turning
When graphene film on flexible base board after shifting carries out electron beam lithography patterned process, patterning line width is 20~50um；
Described by screen printing technique, by the flexible base board after the corresponding metal paste silk-screen to electron beam lithography of conductive metal
When on first area, the metal paste is one of conductive silver paste and conductive copper paste.
In embodiments of the present invention, described that flexible base board is pre-processed, comprising: by oxygen or oxygenous etc.
Gas ions carry out plasma surface treatment to the flexible base board；Preshrunk processing is carried out to the flexible base board after surface treatment,
Wherein, preshrunk temperature is 120~140 DEG C, and when preshrunk is 10~30 minutes a length of.
In embodiments of the present invention, after the acquisition flexible conductive layer, the method also includes: it is flat by heat
Attaching process is pressed, by the stone with the first predetermined pattern on the lower surface of the first flexible circuit board and the first flexible substrate
Black alkene film hot-pressing fitting, and will there is the second predetermined pattern on the upper surface of the second flexible circuit board and second flexible substrate
Graphene film hot pressing fitting；By OCA optical cement by the upper table of first flexible cover plate and the first flexible substrate
Face is fitted and connected, and forms the first OCA optical adhesive layer；It is by OCA optical cement that second flexible cover plate and described first is soft
Property substrate lower surface be fitted and connected, and formed the 2nd OCA optical adhesive layer.
Flexible touch screen provided in an embodiment of the present invention and preparation method thereof, the flexible touch screen include: that the first flexibility is led
Electric layer, polymer barrier layer and the second flexible conductive layer, wherein first flexible conductive layer includes: first flexible substrate,
The first area of the lower surface of the first flexible substrate is provided with conductive metal, and the second area of the first flexible substrate is set
It is equipped with the graphene film with the first predetermined pattern；The polymer barrier layer is set to first flexible conductive layer
Lower section and the top of second flexible conductive layer, and led respectively with first flexible conductive layer and second flexibility
Electric layer is fitted and connected；Second flexible conductive layer includes: second flexible substrate, and the of the upper surface of the second flexible substrate
One region is provided with conductive metal, and the second area of the second flexible substrate is provided with the graphene with the second predetermined pattern
Film.In this way, due in flexible touch screen the first flexible conductive layer and the second flexible conductive layer be by flexible base board and
It is realized with graphene film flexible, so, it is possible to increase flexible, enable the foldable bendable of flexible touch screen
Song improves the service life of touch screen.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the structural schematic diagram one of the flexible touch screen in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the first flexible conductive layer in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram two of the flexible touch screen in the embodiment of the present invention.
Specific embodiment
The exemplary embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here
It is limited.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be by the scope of the present invention
It is fully disclosed to those skilled in the art.
The embodiment of the present invention provides a kind of flexible touch screen, and Fig. 1 is the structure of the flexible touch screen in the embodiment of the present invention
Schematic diagram one, shown in Figure 1, which includes: the first flexible conductive layer 10, polymer barrier layer 11 and second
Flexible conductive layer 12；
Wherein, the first flexible conductive layer 10 includes: first flexible substrate 101, and the of the lower surface of first flexible substrate 101
One region is provided with conductive metal 102, and the second area of the lower surface of first flexible substrate 101 is provided with the first default figure
The graphene film 103 of case；
Polymer barrier layer 11, be set to the first flexible conductive layer 10 lower section and the second flexible conductive layer 12 it is upper
Side, and be fitted and connected respectively with the first flexible conductive layer 10 and the second flexible conductive layer 12；
Second flexible conductive layer 12 includes: second flexible substrate 121, the firstth area of the upper surface of second flexible substrate 121
Domain is provided with conductive metal 122, and the second area of the upper surface of second flexible substrate 121 is provided with the second predetermined pattern
Graphene film 123.
Above-mentioned flexible touch screen is described in detail below.
Firstly, introducing the flexible base board in flexible conductive layer.
In the specific implementation process, in order to increase flexible, the foldability energy of touch screen, realizing has touch flexible
Shield, first flexible substrate and second flexible substrate are by with high transparency and with certain in above-mentioned flexible touch screen
Made of the flexible material of hot ability to bear, in this way, when flexible touch screen is by external force, first flexible substrate and second
Flexible base board can deformation occurs, and after deformation occurs and external force lose after stress deformation can still be maintained when shape
Shape improves the durability of touch screen so that touch screen is non-friable；And since first flexible substrate and second flexible substrate have
There is high transparency, will not influence the display effect of flexible touch screen.
In practical applications, first flexible substrate can be made of polyethylene terephthalate (referred to as PET),
It can also be by polyimides (referred to as PI), it is, of course, also possible to by other with high transparency and with certain hot ability to bear
Flexible material be made, such as polyethylene naphthalate (referred to as PEN).Similarly, similar with first flexible substrate, second
Flexible base board is also that can be made of any one flexible material in above-mentioned PET, PI, PEN, it is of course also possible to by other tools
There is high transparency and there is the flexible material of certain hot ability to bear to be made.Here, the embodiment of the present invention is flexible to being made first
Substrate and the flexible material of second flexible substrate are not specifically limited.
Secondly, introducing the graphene film and conductive metal in flexible conductive layer.
In order to guarantee the display effect of flexible touch screen, the visible light transmittance of above-mentioned graphene film is greater than 88%, example
Such as, the visible light transmittance of above-mentioned graphene film can for 89%, 89.5%, 90%, 91%, 92%, 93%, 94%,
94.5%, 96%, 97.8% etc..
In order to guarantee the touch-control effect of flexible touch screen, the thin layer of above-mentioned graphene film is averaged square resistance less than 400
Ω/, for example, the thin layer of above-mentioned graphene film is averaged square resistance can for 390 Ω/, 250 Ω/, 127 Ω/,
100 Ω/, 90 Ω/, 50 Ω/, 40 Ω/, 20 Ω/ etc..
In the specific implementation process, the number of plies of above-mentioned graphene film can be single layer, can also be with multilayer, such as two layers.
In practical applications, since the visible light transmittance of the graphene film of multilayer is lower, in order to improve graphene film
Transparency, improves the display effect of flexible touch screen, and the number of plies of above-mentioned graphene film is preferably single layer.
Since graphene film has excellent electric conductivity, there is excellent transmitance to visible light, and have fine
Flexibility and extensibility therefore realize that the transparent conductive film in touch screen structure generates touch-control using graphene film
Signal, not only performance meets the requirement of touch screen field, and has the conventional touch screens conductive layers such as oxidation cigarette tin (referred to as ITO)
Pliability not available for material can increase flexible, the foldability energy of touch screen, realize touch screen flexible.
In practical applications, the circuit pattern pair of the first predetermined pattern on graphene film and the first flexible circuit board
It answers, the second predetermined pattern on graphene film is corresponding with the circuit pattern of the second flexible circuit board.Here, the first predetermined pattern
It may be the same or different with the second predetermined pattern.
In the specific implementation process, in order to improve the electric conductivity of flexible conductive layer, stone can be assisted by conductive metal
Black alkene film conductivity.Illustratively, shown in Figure 2, in the first flexible conductive layer 10, where conductive metal 102 the
The first area of one flexible base board is located at the outside of the second area of the first flexible substrate where graphene film 103, quite
Graphene film 103 is surrounded in conductive metal 102, forms an edge sealing so that the first flexible conductive layer 10 include by
Graphene film 103 on the second area of first flexible substrate is come the of the conductive region and first flexible substrate 101 realized
Conductive metal 102 on one region is come the conductive region realized.Similarly, the second flexible conductive layer and the first flexible conductive layer class
It seemingly, also include two conductive regions.
In practical applications, which can also include such as display module, flexible circuit board soft arranging wire, interface core
These components can be connect by the components such as piece, main control chip, peripheral circuit with conductive metal.
In practical applications, above-mentioned conductive metal can be realized by copper, can also be realized by silver, it is, of course, also possible to
It is realized by other metals that can be conductive, such as nickel, here, the embodiment of the present invention is not specifically limited.
Finally, introducing polymer barrier layer.
In the specific implementation process, in order to avoid the first flexible conductive layer and the second flexible conductive layer are in contact, is prevented
One flexible conductive layer and the second flexible conductive layer contact short circuit cause flexible touch screen to damage, can in the first flexible conductive layer and
Nonconducting polymer barrier layer is set between the second flexible conductive layer, with flexible by first by transparent polymer barrier layer
Conductive layer and the barrier of the second flexible conductive layer.
Specifically, which can be formed by the particle of flexible high molecular polymer.Polymer
The material of high molecular polymer in combination layer can be the flexible materials such as PET, PI, PEN, it is of course also possible to be other polymerizations
Object.Here, the embodiment of the present invention is not specifically limited.
In other embodiments of the present invention, in order to realize touch function, referring still to shown in Fig. 1, the flexible touch screen is also
May include: the first flexible circuit board 13 and the second flexible circuit board 14, wherein the first flexible circuit board 13 with have it is first pre-
If the graphene film 103 of pattern is fitted and connected, the second flexible circuit board 14 and the graphene film with the second predetermined pattern
123 are fitted and connected.
Specifically, the first flexible circuit board (Flexible Printed Circuit, FPC) and the second flexible circuit board
It is that there is height reliability with one kind made of the flexible parent metals such as polyimides or polyester film, excellent flexible printing electricity
Road plate has the characteristics that Distribution density is high, light-weight, thickness is thin, bending is good, in this way, can increase touch screen it is flexible,
Foldability energy realizes touch screen flexible.
In addition, in practical applications, by the conductive metal on the soft arranging wire and first flexible substrate of the first flexible circuit board
Connection connects the conductive metal on the soft arranging wire and second flexible substrate of the second flexible circuit board.
Based on previous embodiment, in an alternative embodiment of the invention, Fig. 3 is the flexible touch screen in the embodiment of the present invention
Structural schematic diagram two, it is shown in Figure 3, in order to further protect flexible touch screen, so that flexible touch screen is not easy to be damaged,
The durability for improving flexible touch screen, increases the service life of flexible touch screen, which can also include: first soft
Property cover board 20, the first OCA (Optically Clear Adhesive) optical adhesive layer 21, the second flexible cover plate 22 and the 2nd OCA
Optical adhesive layer 23, wherein the first flexible cover plate 20 is set to the top of first flexible substrate 101, and passes through the first OCA optical cement
Layer 21 and the upper surface of first flexible substrate 101 are fitted and connected；Second flexible cover plate 22 is set under second flexible substrate 121
Side, and be fitted and connected by the lower surface of the 2nd OCA optical adhesive layer 23 and second flexible substrate 121.
In practical applications, it in order to protect the first flexible conductive layer and the second flexible conductive layer not to be damaged, needs to
First flexible cover plate is set outside one flexible conductive layer, and to the second flexible cover plate of setting outside the second flexible conductive layer.
In the specific implementation process, in order to increase flexible, the foldability energy of touch screen, touch screen flexible is realized,
The first flexible cover plate and the second flexible cover plate are by high transparency there is certain heat to bear energy in above-mentioned flexible touch screen
Made of the flexible material of power, in this way, when flexible touch screen is by external force, the first flexible cover plate and the second flexible cover plate
Can deformation occurs, and after deformation occurs and external force lose after stress deformation can still be maintained when shape, make
It is non-friable to obtain flexible touch screen, improves the durability of flexible touch screen；And due to the first flexible cover plate and the second flexible cover
Plate has high transparency, will not influence the display effect of flexible touch screen.
In practical applications, the first flexible cover plate can be made of PET material, can also be made of PI material, when
So, it can also be made of other flexible materials with high transparency and with certain hot ability to bear, such as PEN material.Together
Reason, similar with the first flexible cover plate, the second flexible cover plate is also can be by the flexible material of any one in above-mentioned PET, PI, PEN
Material is made, it is of course also possible to be made of other flexible materials with high transparency and with certain hot ability to bear.Here,
The embodiment of the present invention is not specifically limited the flexible material that the first flexible cover plate and the second flexible cover plate is made.
In practical applications, the first OCA optical adhesive layer is formed by transparent OCA optical cement, for soft by first
Property cover board is fitted and connected with the first flexible conductive layer；Similarly, similar with the first OCA optical adhesive layer, the 2nd OCA optical adhesive layer is also
It is formed by transparent OCA optical cement, for bonding the second flexible cover plate and the second flexible conductive layer.
In practical applications, in order to reduce the thickness of flexible touch screen while guaranteeing to be bonded effect, above-mentioned first
The thickness of OCA optical adhesive layer and the 2nd OCA optical adhesive layer can be 20~40um, for example, the first OCA optical adhesive layer and second
The thickness of OCA optical adhesive layer can be 20um, 21um, 25.5um, 28um, 31um, 32um, 37um, 39um, 40um etc..
Below with reference to the structure of above-mentioned flexible touch screen, preparation method is elaborated further.
Based on the same inventive concept, as the realization to above-mentioned flexible touch screen, the embodiment of the present invention provides a kind of flexibility
The preparation method of the preparation method of touch screen, the flexible touch screen is corresponding with foregoing soft touch screen embodiment.The flexible touch
The preparation method of screen may comprise steps of A~C:
Step A: flexible conductive layer is prepared；
Wherein, flexible conductive layer includes the first flexible conductive layer and the second flexible conductive layer.
Specifically, in order to prepare flexible touch screen, need first to prepare the first flexible conductive layer and the second flexibility respectively
Conductive layer.
Step B: polymer barrier layer is set to the lower section of the first flexible conductive layer, and is bonded with the first flexible conductive layer
Connection；
Step C: the second flexible conductive layer is set to the lower section of polymer barrier layer, and is bonded company with polymer barrier layer
It connects.
Specifically, after preparing the first flexible conductive layer and the second flexible conductive layer, in order to avoid the first flexibility is led
Electric layer and the second flexible conductive layer are in contact, and prevent the first flexible conductive layer and the second flexible conductive layer contact short circuit, cause soft
Property touch screen from being damaged, need to fit in polymer barrier layer between the first flexible conductive layer and the second flexible conductive layer, with logical
Polymer barrier layer is crossed to obstruct the first flexible conductive layer and the second flexible conductive layer.
In other embodiments of the present invention, after step, the preparation method of above-mentioned flexible touch screen can also include step
Rapid D: by hot concora crush attaching process, first will presets on the lower surface of the first flexible circuit board and first flexible substrate
The graphene film hot pressing of pattern is bonded, and will have second on the upper surface of the second flexible circuit board and second flexible substrate
The graphene film hot pressing of predetermined pattern is bonded.
In an alternative embodiment of the invention, in order to improve the durability and service life of flexible touch screen, it is necessary to protect
First flexible conductive layer and the second flexible conductive layer are not easy to be damaged, then, it is after step or after step c, above-mentioned
The preparation method of flexible touch screen can also include the following steps E~F:
First flexible cover plate: being set to the top of the first flexible conductive layer by step E, soft by first by OCA optical cement
Property cover board and the upper surface of first flexible substrate be fitted and connected, and form the first OCA optical adhesive layer；
Second flexible cover plate: being set to the lower section of the second flexible conductive layer by step F, soft by second by OCA optical cement
Property cover board and the lower surface of first flexible substrate be fitted and connected, and form the 2nd OCA optical adhesive layer.
Specifically, it in order to protect the first flexible conductive layer and the second flexible conductive layer to be not easy to be damaged, needs to first
First flexible cover plate is set outside flexible conductive layer, and to the second flexible cover plate of setting outside the second flexible conductive layer.
The technique for preparing flexible conductive layer is described in detail below.
In the specific implementation process, in order to prepare the first flexible conductive layer and the second flexible conductive layer, above-mentioned steps A is specific
It can be realized by following steps A1~A5.
Step A1: by chemical vapour deposition technique, graphene film is grown on metal foil；
In practical applications, chemical vapour deposition technique can be low-pressure chemical vapor deposition (Low Pressure
Chemical Vapor Deposition, LPCVD), Metallo-Organic Chemical Vapor deposit (Metal Organic Chemical
Vapor Deposition, MOCVD), plasma activated chemical vapour deposition (Plasma Enhanced Chemical Vapor
Deposition, PECVD), laser chemical vapor deposition (Laser Chemical Vapor Deposition, LVCD) etc..Tool
For body, in order to prepare transparency height, high-quality single-layer graphene film, it can be vapor-deposited using hot wall low pressure chemical
(LPCVD) graphene film is prepared.
In practical applications, when executing step A1 and passing through process for preparing graphenes by chemical vapour deposition film, carbon source can be with
It is realized by carbon containing hydrocarbon gas such as methane (CH4), ethylene (C2H4), acetylene (C2H2).Specifically, in order to prepare
Transparency height, high-quality single-layer graphene film out, can be used methane as carbon source.
Specifically, in order to prepare transparency height, high-quality single-layer graphene film, passing through of step A1 is being executed
When vapour deposition process prepares graphene film, growth temperature can be 800~1050 DEG C, for example, growth temperature can be 800
DEG C, 850 DEG C, 875 DEG C, 900 DEG C, 915 DEG C, 930 DEG C, 950 DEG C, 980 DEG C, 1000 DEG C, 1015 DEG C, 1050 DEG C etc..Grow air pressure
Can be 50Pa hereinafter, for example, growth air pressure can be 47Pa, 40Pa, 35Pa, 30Pa, 24Pa, 21Pa, 17Pa, 14Pa,
12Pa, 10Pa etc..The visible light transmittance of above-mentioned graphene film is greater than 88%, for example, the visible light of above-mentioned graphene film
Transmitance can be 89%, 89.5%, 90%, 91%, 92%, 93%, 94%, 94.5%, 96%, 97.8% etc..The stone
The thin layer of black alkene film is averaged square resistance less than 400 Ω/, the square resistance for example, thin layer of above-mentioned graphene film is averaged
It can be 390 Ω/, 250 Ω/, 127 Ω/, 100 Ω/, 90 Ω/, 50 Ω/, 40 Ω/, 20 Ω/ etc..
In practical applications, used when executing step A1 by process for preparing graphenes by chemical vapour deposition film
It can be copper, aluminium, tin, gold etc. for the metal foil as substrate.Specifically, higher in order to prepare visible light transmittance rate
Single-layer graphene film, it is used to be used to be realized by the lesser rolled copper foil of appearance carbon amounts as the metal foil of substrate,
And the rolled copper foil with a thickness of 25um.
Step A2: flexible base board is pre-processed；
Wherein, flexible base board includes first flexible substrate and second flexible substrate.
Specifically, when preparing the first flexible conductive layer, first flexible substrate is pre-processed；It is soft in preparation second
When property conductive layer, second flexible substrate is pre-processed.
In the specific implementation process, carrying out pretreated step to flexible base board may include: by oxygen or oxygen-containing
The plasma of gas carries out plasma surface treatment to flexible base board；Flexible base board after surface treatment is carried out at preshrunk
Reason.
Specifically, firstly, in order to improve the matching of graphene film and flexible base board, enhance the surface of flexible base board
To the adhesive force of graphene, so that graphene film is not easy to fall off with flexible base board, need first to carry out flexible base board etc.
Gas ions surface treatment.In practical applications, in order to enable the surface of flexible base board is higher to the adhesive force of graphene, Ke Yili
With oxygen or containing the plasma of oxygen, plasma surface treatment is carried out to flexible base board.
Next, in order to which flexible base board is formed, so that the size of flexible base board is not susceptible to change in the subsequent process,
The yield rate for improving flexible touch screen can be right under preset temperature after carrying out plasma surface treatment to flexible base board
Flexible base board after surface treatment carries out the preshrunk processing of preset duration, such as carries out vacuum to the flexible base board after surface treatment
Heated drying processing, this way it is possible to realize flexible base board is sufficiently carried out preshrunk aging in advance, thus, it was prepared subsequent
Cheng Zhong, it is ensured that the size of flexible base board is not susceptible to change, and improves the yield rate of flexible touch screen.Such as by the first flexible circuit
When plate is bonded with graphene film progress hot pressing, so that it may ensure that the size of first flexible substrate is not susceptible to become, so that first
The matching degree of flexible circuit board and first flexible substrate is more preferable.
In practical applications, the preshrunk temperature and preshrunk duration of preshrunk processing can be soft according to preparing by those skilled in the art
The used related process of property touch screen determines.Specifically, in order to guarantee preferably preshrunk effect, to flexible base board
Carry out preshrunk processing when, preshrunk temperature can be 120~140 DEG C, for example, preshrunk temperature can for 120 DEG C, 125 DEG C, 127 DEG C,
130 DEG C, 135 DEG C, 139 DEG C, 140 DEG C etc., preshrunk duration can be 10~30 minutes, for example, preshrunk duration can for 10 minutes,
12 minutes, 15 minutes, 19 minutes, 25 minutes, 28 minutes, 30 minutes etc..
Step A3: pressing transfer technique by hot-rolling, graphene film is transferred to treated from metal foil flexible base
On the second area of plate；
Here, according to the difference of flexible conductive layer to be prepared, the second area of flexible base board can refer to the first flexibility
The second area of the lower surface of substrate may also mean that the second area of the upper surface of second flexible substrate.
Specifically, when preparing the first flexible conductive layer, transfer technique is pressed by continuous roll-to-roll hot-rolling, by graphite
On the second area of the lower surface for first flexible substrate that alkene film is transferred to that treated from metal foil, so that the first flexible base
The conductive region realized by graphene film is formed on the second area of plate；When preparing the second flexible conductive layer, pass through hot-rolling
Transfer technique is pressed, the second area of the upper surface of graphene film is transferred to treated from metal foil second flexible substrate
On, so that forming the conductive region realized by graphene film on the second area of second flexible substrate.
Specifically, transfer technique is being pressed by hot-rolling, it is soft that graphene film is transferred to treated from metal foil
When on the second area of property substrate, transfer pressure can be 1.5~4kg/cm2, the transmission speed control of upper roll wheel and lower roll wheel
It can be 0.2~0.8m/min, transfer temperature can be 115~135 DEG C.
Step A4: by electron beam lithography, electron beam is carried out to the graphene film on the flexible base board after transfer
Lithographic patterning processing, forms the graphene film with predetermined pattern；
Wherein, the graphene film of the predetermined pattern includes the graphene film and the second default figure of the first predetermined pattern
One of graphene film of case.
Specifically, by electron beam lithography, that side with graphene film is lost on flexible substrates
It carves, the unwanted graphene in part is etched away, form the graphene film with preinstalled circuit pattern.Here, when preparation
When the first flexible conductive layer, the graphene film of predetermined pattern refers to the graphene film with the first predetermined pattern；Work as preparation
The second flexible conductive layer when, the graphene film of predetermined pattern refers to the graphene film with the second predetermined pattern.
Here, predetermined pattern can be the first predetermined pattern or the second predetermined pattern.In practical applications, the first default figure
Case is corresponding with the circuit pattern in the first flexible circuit board；Circuit pattern pair in second predetermined pattern and the second flexible circuit board
It answers.To which the first predetermined pattern can be identical with the second predetermined pattern, can also be also different.
In the specific implementation process, in order to preferably to graphene film progress patterned process, above-mentioned electron beam lithography
Technology can be electronic laser beam photoetching technique.It is of course also possible to be other photoetching techniques that can etch away graphene.
In practical applications, in order to which flexible circuit board to be bonded well with graphene film, to graphene film into
When row electron beam lithography patterned process, patterning line width can be 20~50um.
Step A5: through screen printing technique, after the corresponding metal paste silk-screen to electron beam lithography of conductive metal
On the first area of flexible base board, flexible conductive layer is obtained.
Wherein, flexible conductive layer includes the first flexible conductive layer and the second flexible conductive layer.
Here, according to the difference of flexible conductive layer to be prepared, the first area of flexible base board can refer to the first flexibility
The first area of the lower surface of substrate may also mean that the first area of the upper surface of second flexible substrate.
Specifically, it in order to improve the electric conductivity of flexible conductive layer, needs to assist graphene film by conductive metal
Electric conductivity stencils metal paste by screen printing technique on the first area of the first flexible substrate after electric lithography
Onto the first area of the lower surface of first flexible substrate, so that forming the conduction region realized by conductive metal on first area
Domain obtains the first flexible conductive layer；Similarly, it obtains the process of the second flexible conductive layer and obtains the process of the first flexible conductive layer
It is similar, by screen printing technique on the second area of the second flexible substrate after electric lithography, metal paste is stenciled
On the first area of the upper surface of second flexible substrate, so that the conductive region realized by conductive metal is formed on first area,
Obtain the second flexible conductive layer.
In practical applications, when passing through screen printing technique silk-screened conductive metal, metal paste can be conductive silver paste
One of with conductive copper paste.
As shown in the above, in embodiments of the present invention, due to the first flexible conductive layer and in flexible touch screen
Two flexible conductive layers are realized by flexible base board and with graphene film flexible, so, it is possible to increase flexible
Property, enable flexible touch screen foldable flexible, improves the service life of touch screen.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the present invention in any form.It is right
For those skilled in the art, the invention may be variously modified and varied.It is all according to the technical essence of the invention to above
Any simple modification, equivalent replacement, modification, improvement etc. made by embodiment, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of flexible touch screen, which is characterized in that the flexible touch screen includes: the first flexible conductive layer, polymer barrier
Layer and the second flexible conductive layer, wherein
First flexible conductive layer includes: first flexible substrate, and the first area of the lower surface of the first flexible substrate is set
It is equipped with conductive metal, the second area of the first flexible substrate is provided with the graphene film with the first predetermined pattern；
The polymer barrier layer, be set to first flexible conductive layer lower section and second flexible conductive layer it is upper
Side, and be fitted and connected respectively with first flexible conductive layer and second flexible conductive layer；
Second flexible conductive layer includes: second flexible substrate, and the first area of the upper surface of the second flexible substrate is set
It is equipped with conductive metal, the second area of the second flexible substrate is provided with the graphene film with the second predetermined pattern.
2. flexible touch screen according to claim 1, which is characterized in that the flexible touch screen further include: first is flexible
Circuit board and the second flexible circuit board, wherein first flexible circuit board and the graphene with the first predetermined pattern
Film adhered connection, second flexible circuit board are fitted and connected with the graphene film with the second predetermined pattern.
3. flexible touch screen according to claim 1, which is characterized in that the flexible touch screen further include: first is flexible
Cover board, the first OCA optical adhesive layer, the second flexible cover plate and the 2nd OCA optical adhesive layer, wherein
First flexible cover plate is set to the top of the first flexible substrate, and by the first OCA optical adhesive layer with
The upper surface of the first flexible substrate is fitted and connected；
Second flexible cover plate is set to the lower section of the second flexible substrate, and by the 2nd OCA optical adhesive layer with
The lower surface of the second flexible substrate is fitted and connected.
4. flexible touch screen according to claim 3, which is characterized in that first flexible cover plate and the second flexible cover plate
It is made of one of polyethylene terephthalate, polyimides and polyethylene naphthalate material；
The first OCA optical adhesive layer and the 2nd OCA optical adhesive layer with a thickness of 20~40um.
5. flexible touch screen according to any one of claims 1 to 4, which is characterized in that the graphene film it is visible
Light transmission rate is greater than 88%；The thin layer of the graphene film is averaged square resistance less than 400 Ω/；
The polymer barrier layer is formed by the particle of flexible high molecular polymer；
The first flexible substrate and second flexible substrate are by polyethylene terephthalate, polyimides and poly- naphthalenedicarboxylic acid
One of glycol ester material is made.
6. a kind of preparation method of such as flexible touch screen described in any one of claim 1 to 5, which is characterized in that the method
Include:
Prepare flexible conductive layer, wherein the flexible conductive layer includes the first flexible conductive layer and the second flexible conductive layer；
Polymer barrier layer is set to the lower section of first flexible conductive layer, and is bonded company with first flexible conductive layer
It connects；
Second flexible conductive layer is set to the lower section of the polymer barrier layer, and is bonded with the polymer barrier layer
Connection.
7. according to the method described in claim 6, it is characterized in that, described prepare flexible conductive layer, comprising:
By chemical vapour deposition technique, graphene film is grown on metal foil；
Flexible base board is pre-processed, wherein the flexible base board includes first flexible substrate and second flexible substrate；
Transfer technique is pressed by hot-rolling, the graphene film is transferred to treated from metal foil flexible base board
On second area；
By electron beam lithography, the graphene film on the flexible base board after transfer is carried out at electron beam lithography patterning
Reason forms the graphene film with predetermined pattern, wherein the graphene film of the predetermined pattern includes the first predetermined pattern
Graphene film and one of the graphene film of the second predetermined pattern；
By screen printing technique, by of the flexible base board after the corresponding metal paste silk-screen to electron beam lithography of conductive metal
On one region, the flexible conductive layer is obtained.
8. the method according to the description of claim 7 is characterized in that described by chemical vapour deposition technique, on metal foil
When growth forms graphene film, growth temperature is 800~1050 DEG C, and growth air pressure is 50Pa or less；The metal foil is pressure
Prolong copper foil, and the rolled copper foil with a thickness of 25um；The visible light transmittance of the graphene film is greater than 88%；The stone
The thin layer of black alkene film is averaged square resistance less than 400 Ω/；
Transfer technique is pressed by hot-rolling described, it is flexible that the graphene film is transferred to treated from the metal foil
When on the second area of substrate, transfer pressure is 1.5~4kg/cm2, the transmission speed of upper roll wheel and lower roll wheel is 0.2~
0.8m/min, transfer temperature are 115~135 DEG C；
Described by electron beam lithography, electron beam lithography figure is carried out to the graphene film on the flexible base board after transfer
When caseization processing, patterning line width is 20~50um；
Described by screen printing technique, by the flexible base after the corresponding metal paste silk-screen to electron beam lithography of conductive metal
When on the first area of plate, the metal paste is one of conductive silver paste and conductive copper paste.
9. the method according to the description of claim 7 is characterized in that described pre-process flexible base board, comprising:
By oxygen or oxygenous plasma, plasma surface treatment is carried out to the flexible base board；
Preshrunk processing is carried out to the flexible base board after surface treatment, wherein preshrunk temperature is 120~140 DEG C, a length of 10 when preshrunk
~30 minutes.
10. the method according to the description of claim 7 is characterized in that it is described obtain the flexible conductive layer after, the side
Method further include:
By hot concora crush attaching process, will have first on the lower surface of the first flexible circuit board and the first flexible substrate
The graphene film hot pressing of predetermined pattern is bonded, and by having on the upper surface of the second flexible circuit board and second flexible substrate
The graphene film hot pressing of second predetermined pattern is bonded；
First flexible cover plate and the upper surface of the first flexible substrate are fitted and connected by OCA optical cement, and formed
First OCA optical adhesive layer；
Second flexible cover plate and the lower surface of the first flexible substrate are fitted and connected by OCA optical cement, and formed
2nd OCA optical adhesive layer.
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Cited By (1)
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Application publication date: 20181218 |