CN104020918A - Graphene capacitance touch screen and manufacturing method thereof - Google Patents
Graphene capacitance touch screen and manufacturing method thereof Download PDFInfo
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- CN104020918A CN104020918A CN201410294608.XA CN201410294608A CN104020918A CN 104020918 A CN104020918 A CN 104020918A CN 201410294608 A CN201410294608 A CN 201410294608A CN 104020918 A CN104020918 A CN 104020918A
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Abstract
The invention relates to a graphene capacitance touch screen and a manufacturing method thereof. The touch screen is characterized by comprising a cover plate layer, an OCA optical clear adhesive layer and a graphene transparent conductive film layer, wherein a circuit layer is arranged on the lower surface of the graphene transparent conductive film layer, and an electrode layer is arranged on the periphery of the circuit layer, and is used for leading out the circuit layer. When the touch screen works, a low-voltage alternating-current electric field is formed in the graphene transparent conductive film layer, when a user finger touches the surface of the graphene capacitance touch screen, a coupling capacitor is formed between the finger and the graphene transparent conductive film layer, and a certain amount of electric charge is transferred to the human body at that time, and electric charge is supplied from four corners of the graphene capacitance touch screen to restore the electric charge loss, and the distance of the electric charge amount supplied from each direction and the touching point is proportional, so that the location of the touching point can be calculated.
Description
Technical field
The present invention relates to a kind of capacitive touch screen and preparation method thereof, particularly a kind of formation for Graphene and structure and the technological method for processing formulated.
Background technology
As everyone knows, transparent conductive film is a kind of important photoelectric material, and it is widely used in the photoelectric fields such as touch-screen, liquid crystal display, organic light-emitting diode display (OLED), solar cell.Graphene (graphene) is that AK professors Geim by Univ Manchester UK in 2004 wait a kind of novel charcoal material of finding, and it is the bi-dimensional cellular shape structure by monolayer carbon atomic building.Since being found, Graphene has just caused rapidly the extensive concern of academia and business circles, is also one of new material attracting most attention at present.The charge carrier of Graphene has zero effective mass, show the behavior that is similar to photon, these characteristics make Graphene show uncommon half-integer quantum Hall effect, room temperature quantum Hall effect etc., and for verifying that relativistic quantum mechanics phenomenon provides desirable platform.Due to the crystalline network of perfect and high-sequential, Graphene also shows thundering high crystallography quality.Under room temperature, Graphene has 100 times to the carrier mobility of silicon, shows the ballistic transport characteristic of room temperature submicron-scale.Graphene has excellent electric conductivity, and conductivity is 1.6 times of copper; Graphene all has excellent permeability near infrared, visible ray and ultraviolet light, and the light transmission of single-layer graphene reaches 97.7%; The intensity of Graphene can reach 130 GPa, is more than 100 times of steel, and has good pliability and extensibility; The thermal conductivity of Graphene can reach 5000 W/mK, is 3 times of pure diamond under room temperature, and has well thermally-stabilised and chemical stability.These excellent physical propertys make Graphene show huge potentiality in radio-frequency (RF) transistors, hypersensor, transparent conductive film, the superpower and high application aspect of leading compound substance, high performance lithium ion battery and ultracapacitor etc.According to the Lux Research prediction of 2009, the market of Graphene Related product in 2015 will reach 53,000,000,000 dollars, and be widely used in the fields such as Aero-Space, automobile, the energy, electronics, medical treatment, military affairs and telecommunications.Just because of abundant physical property, the performance of excellence and the wide application prospect of Graphene, discoverer AK Geim professor and KS professor Novoselov of Graphene have won the Nobel Prize in physics in 2010 years, and this has further excited research and the application of the whole world to Graphene to explore.
Graphene can be given full play to its structure and performance advantage as nesa coating, is most important and one of the most promising application of Graphene.Such as, than the oxide-base transparent conductive film material (tin indium oxide (ITO), aluminum zinc oxide (AZO) etc.) generally using, Graphene has outstanding advantage aspect pliability, thermal stability and chemical stability.At present, the Graphene that mainly adopts chemical oxidation stripping method and chemical vapor deposition (CVD) method to obtain is prepared transparent graphene conductive film.Due to relatively simple preparation process, and output is larger, and the Graphene that chemical oxidation stripping method makes is the preparation for transparent conductive film at the research initial stage.But, there are a large amount of faults of construction, and be difficult to control the architectural feature such as size and the number of plies of Graphene in chemical stripping Graphene second-rate.Present stage, CVD method has become the exemplary process of controlled preparation large area, high-quality graphene, and can continuous production goes out to reach the high-performance transparent graphene conductive film of the above size of hundred meter levels.At present, exploration and the application of development based on CVD transparent graphene conductive film material have become the research tendency of high-performance transparent graphene conductive film.In concrete enforcement, generally manufacture in the following way.
Production method one:
CVD Graphene on employing transparent base is as transparent conductive film.First utilize the chemical vapor deposition (CVD) method Graphene that (copper, nickel, platinum etc.) growth individual layer is dominant on metal, adopt wet chemistry method that single-layer graphene is transferred to (for example polyethylene terephthalate on transparent base, PEN, quartz or glass etc.), obtain the single-layer graphene transparent conductive film on transparent base.The surface resistance of graphene film is between 400-1000 ohm, and transmittance is between 96-97.7%.
Production method two:
Repeat the step that wet chemistry method shifts single-layer graphene, obtain multilayer (2-8 layer) transparent graphene conductive film on transparent base, the surface resistance of graphene film is between 30-400 ohm, and transmittance is between 80-95%.
Production method three:
Adopt the method for doping to carry out aftertreatment to Graphene.The surface resistance of the graphene film after doping is between 100-400 ohm, and transmittance is between 96-97.7%.
Production method four:
The surface of the single-layer graphene transparent conductive film on transparent base, utilize spin-coating method to cover layer of transparent conducting polymer composite " poly-3; 4-ethylenedioxy thiophene/poly styrene sulfonate (PEDOT:PSS) ", obtain graphene-based compound transparent electricity conductive film material.
Along with constantly advancing of modern multimedia infotech, and the continuous increase of amusement, query facility, the application of touch-screen is more and more extensive.And capacitive touch screen only needs to touch, do not need that pressure just can produce signal, only needs once or completely do not need screen calibration afterwards, lower on light loss and system power dissipation, capacitive technologies is wear-resistant, the life-span is long in production, the plurality of advantages such as when user uses maintenance cost is low.And Graphene is as the one in new material, it has the advantage can not be substituted making aspect touch-screen.Following Graphene and existing ITO conductive material are compared, the intensity that Graphene has excellent electric conductivity, all have excellent permeability, a Graphene near infrared and visible ray and ultraviolet light can reach 130 GPa and have good pliability and extensibility, have well thermally-stabilised and chemical stability simultaneously, and these advantages all will show that Graphene becomes a kind of new material substituting in conventional I TO conductive material at last.
The shortcoming of the transparent conductive film material generally using is at present, outer field film easily scratches stabs and cause touch screen function not normal; ITO conductive layer is easily subject to the variation of external condition and changes its characteristic, and Graphene is as high stability and good flexible conductive layer material, can overcome the shortcoming of traditional material.
Summary of the invention
The invention provides a kind of Graphene capacitive touch screen and preparation method thereof, it utilizes grapheme material to be made into Graphene capacitive touch screen, compared with traditional material, be easier to observe and inspection, adopt Petting Area Graphene to add periphery cabling silver slurry as wire, can reduce the impedance of passage, touch better effects if, and this be to be fundamental purpose of the present invention.
The technical solution used in the present invention is: a kind of Graphene capacitive touch screen, comprise cover layer, OCA optics glue-line and transparent graphene conductive film layer, wherein, this OCA optics glue-line is arranged between this cover layer and this transparent graphene conductive film layer, this cover layer is made up of PC material, on this transparent graphene conductive film layer lower surface, be also provided with line layer, be provided with electrode layer in this line layer surrounding, this electrode layer is formed by silver-colored pulp material printing, this electrode layer is in order to draw this line layer, when work, in this transparent graphene conductive film layer, form a low-voltage AC electric field, in the time of this Graphene capacitance touch screen surfaces of user's finger touch, finger can form a coupling capacitance with this transparent graphene conductive film interlayer, have a certain amount of electric charge this moment and transfer to human body, for recovery charge loss, electric charge supplements into from four jiaos of this Graphene capacitive touch screen, the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, can extrapolate thus the position of touch point.
A method for making for Graphene capacitive touch screen, comprises the steps:
The first step: transparent graphene conductive film is cut to blanking, transparent graphene conductive film is cut into the required size of typesetting.
Second step: aging to having divided the transparent graphene conductive film cutting to shrink in the first step.
Transparent graphene conductive film after cutting is fixed on glass with high temperature resistant adhesive tape, temperature in case to be baked reaches 80 while spending, advance baking box to carry out high temperature shrink transparent graphene conductive film aging, baking temperature is controlled at 135 degree, and baking time is controlled at 50 minutes.
After baking, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 80 degree, just transparent graphene conductive film was taken out from baking box.
Complete aging to the shrink of transparent graphene conductive film after, the work that each piece transparent graphene conductive film is measured to sheet resistance, 5 sheet resistance values measuring four angles and the centre position of each piece transparent graphene conductive film, resistance fluctuation range is certified products in positive and negative 50 Ω.
The 3rd step: clean having completed the aging transparent graphene conductive film that shrinks in second step with air pressure gun, republish black ink target, printing baking temperature continues 10 minutes in the situation that of 70 degree.
After printing has been toasted, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 50 degree, just transparent graphene conductive film was taken out from baking box.
The 4th step: adopt the principle of laser-induced thermal etching to remove unwanted graphene conductive part.
The transparent graphene conductive film of black target out of the press in the 3rd step is put on laser-induced thermal etching platform, open air draught, to inhale flat material, import and woven after job sequence, laser etching machine first catches the target of every mould and locates, then the Graphene of every mould is carried out to etching, unwanted current-carrying part is fallen in laser-induced thermal etching, out by the Etching of touch-screen active region simultaneously.
After laser-induced thermal etching completes, utilize multimeter to get to 200M Ω and measure etching area and whether have impedance, illustrate that without resistance etching is clean, then measure two half adjacent triangular pattern with multimeter and have no resistance, there is no short circuit without resistance explanation interchannel, function is normal.
The 5th step: carry out printed silver slurry to having completed the transparent graphene conductive film after laser-induced thermal etching in the 4th step, silver slurry is printed on both sides and the upside of transparent graphene conductive film.
Carrying out in the process of printed silver slurry, baking temperature is controlled at 130 degree baking 40 minutes.
Case temperature to be baked reaches 80 while spending, advances baking box to toast the transparent graphene conductive film that is printed with silver slurry.
After baking completes, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 80 degree, just transparent graphene conductive film was taken out from baking box.
The printed silver slurry of this step is to extract for the link tester of touch-screen active region the inside is crossed to silver slurry, reduces channel impedance, and subsequent handling binds together with FPC again.
After having toasted, silver slurry carries out hundred lattice tests, on silver slurry, draw the oblique line of multiple tracks miter angle with blade, be combined into the lines grid of 45 degree, be bonded at above grid by test adhesive tape again, after being firmly bulldozed, at the uniform velocity tear up test tape with miter angle again, the silver slurry in lattice does not come off, and the adhesion of explanation silver slurry on Graphene is qualified.
Getting to 20K Ω with multimeter, measure the impedance of single line channel, as channel impedance≤20K Ω, is certified products when ring earth resistance≤200 Ω.
The 6th step: the transparent graphene conductive film of silver slurry out of the press in the 5th step is carried out to the work of laser circuit profile.
First placing glass paper fixing with double faced adhesive tape on laser machine platform, first use the radium-shine pairs of bit line of 3.8 ~ 5.0W low-power and circuit profile, then, open air draught, again transparent graphene conductive film is placed up, aimed at pairs of bit line and carry out again the work of laser profile.
The 7th step: transparent graphene conductive film and the FPC of radium-shine good required circuit profile in the 6th step are bound.
First, ACF is pasted at FPC pressing golden finger place, ACF must paste the place of windowing at FPC Copper Foil between two parties.
The then position of lifting one's head at circuit by FPC precompressed, then carry out localization tool, adjust flatness and the position of thermal head, finally carry out pressing by pulse hot press.
After hot pressing completes, sealing on the junction point of FPC and circuit, is used for fixing FPC.
The 8th step: by having bound the transparent graphene conductive film of FPC in the 7th step, be connected to computer by SIU development board, more whether enter engineering debug pattern to go to detect the data of each passage normal by developing software.
The test of ruling again, sees whether lines show normally.
The 9th step: make PC cover plate materials, first, tear the diaphragm of PC printing surface, at its printing surface process black ink, produce needed touch viewing area and key icon.Baking temperature 70 is spent 10 minutes duration.
The tenth step: print many one decks black ink on the PC cover plate in the 9th step, its objective is that baking temperature 70 is spent 30 minutes duration in order to increase ink light-proofness and to fill up some little pin holes.
Test ink adhesion is carried out in the hundred lattice tests by the 5th step after having toasted, qualified to guarantee printed ink adhesion.
The 11 step: make optical clear glue-line.
Hold size according to typesetting design successfully with blanking machine, blanking machine air pressure reaches in the situation of nominal operation pressure 5bar ± 1 can carry out work, and tension force is controlled within the scope of 0.7 ~ 0.85N.
Method fluting borehole by OCA layer with laser, is available the binding position of FPC and camera hole site, to reduce difference in height and to increase transmittance.
Carry out OCA radium-shine in, it is release facing down easily, opens air draught, OCA put in board centre position to radium-shine complete rear eliminating waste material, and cleaning.
The 12 step: the PC cover plate that the radium-shine good OCA layer of the 11 step and the tenth step are printed is puted up greatly and closed, manually to fitting with laminating machine behind good position.
In the process of laminating, control laminating speed 20 ~ 25m/min, pressure 0.1 ~ 0.2kg, laminating process will be controlled cleanliness factor well, in order to avoid cause cosmetic damage.
The 13 step: the work of cutting profile and digging receiver hole putting up greatly the PC cover plate that gets togather in the 12 step.
The 14 step: by the 13 step cut the PC cover plate of profile and the 8th step after tested qualified transparent graphene conductive film chip mounter carry out small pieces laminating.
First radium-shine good localization tool before laminating, guarantee aligning accuracy, on chip mounter, on an air-suction table, first put the 8th step qualified transparent graphene conductive film after tested well, on another air-suction table, put the PC cover plate of the 13 step well, tear the release film on OCA layer, then fit.
Laminating setting parameter atmospheric pressure value 0.45Bar, pace 1000mm/s, return speed 200mm/s, flip-flop transition 10*100ms.
The 15 step: the product that the 14 step is posted carries out deaeration.
Every flake products is inserted in static box, deliver to de-bubble in defoamer, arrange that defoamer temperature 40 is spent, air pressure 5kg, 40 minutes time, after de-bubble, check that steam bubble has not remove completely and whether graphene conductive layer has layering.
The 16 step: the Graphene product that removes good bubble in the 15 step is carried out to outward appearance wiping and inspection, dirty and the stain of wiping, check outward appearance have or not scratch, stab, the acute tooth of ink penetration, steam bubble, foreign material, stain, white point etc. are bad, outward appearance non-defective unit carries out Function detection again, by the method for testing of the 8th step, be connected to computer by SIU development board, more whether detect the data of each passage by developing software normal, and the test of ruling, see whether lines show normal.
The 17 step: complete again Graphene capacitive touch screen to be installed to after the 16 step and see practical effect on mobile phone complete machine, and carry out the optimization of IC configuration parameter, again debug the IC configuration parameter of an applicable Graphene, make the effect of complete machine more perfect, when user's finger touch is during with the touch screen surface of Graphene, between finger and Graphene conductor layer, can form a coupling capacitance, just have a certain amount of electric charge and transfer to human body, in order to recover these loss of charge, electric charge supplements into from four jiaos of screen, the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, touch-control IC can extrapolate the position of touch point thus, Graphene capacitive touch screen touch sensitivity is high, rule more smooth, user's experience sense is stronger.
Beneficial effect of the present invention is: the transparent conductive film with Graphene is processed to circuit pack by the method for laser-induced thermal etching, by binding FPC by the connection of the inside to mainboard end, paste one deck OCA on Graphene surface again, finally cover plate is pasted on grapheme material, be combined into a slice capacitive touch screen.This touch-screen is realized touch function by touch-control IC and the control of complete machine mainboard.Graphene capacitive touch screen is arranged on above display screen, for detection of the position touching, in the time that capacitance plate touches, just resolved the position coordinates of contact by touch-control IC, processor obtains the raw data touching, and removes and disturbs, measuring and calculating spot pressure, sets up touch area, calculates accurate coordinates.
The present invention has adopted novel conductive material " Graphene ".Strong for its thermal stability and chemical stability, in severe situation, composition can not change, and high-flexibility and extensibility, the method that adopts laser-induced thermal etching simultaneously periphery silver slurry adopts the technique of serigraphy to make circuit pack.Have high transmission rate, stability high, make environmental protection, touch precisely, the feature such as user's experience sense is strong.
Technology of the present invention is mainly towards the new material of touch-screen industry and the importing of manufacture craft, it can provide the Graphene capacitive touch screen of high stability, can also experience some aspects that Graphene capacitive touch screen is better than now conventional ITO touch-screen: 1, Graphene capacitive touch screen of the present invention has adopted Graphene as main composition material, compared with traditional ITO touch-screen, cost obviously reduces, in indium tin situation less and less, certainly will to there is new material to substitute traditional ITO.2, Graphene capacitive touch screen of the present invention has adopted Graphene as main composition material, has very high transmittance.The image showing by touch-screen like this can be more true to nature, and color also can be truer.3, Graphene capacitive touch screen of the present invention has adopted Graphene as main composition material, because Graphene has very high deflection degree, has so just greatly reduced as ITO material because bending the situation that excessively causes dysfunction.
Brief description of the drawings
Fig. 1 is that circuit of the present invention forms schematic diagram.
Fig. 2 is layer structure schematic diagram of the present invention.
Fig. 3 is one-piece construction schematic diagram of the present invention.
Fig. 4 is overall composition diagram of the present invention.
Fig. 5 is that the present invention detects Graphene sheet resistance value schematic diagram.
Fig. 6 is laser-induced thermal etching Graphene area schematic of the present invention.
Fig. 7 is screen printed electrode layer of the present invention and Graphene overlap joint schematic diagram.
Fig. 8 is Graphene circuit profile schematic diagram of the present invention.
Fig. 9 is that the present invention binds the conspectus after FPC.
Figure 10 is FPC tensile test of the present invention (vertical direction) schematic diagram.
Figure 11 is FPC tensile test of the present invention (horizontal direction) schematic diagram.
Figure 12 is cover plate silk-screen schematic diagram of the present invention.
Figure 13 is that cover plate of the present invention and OCA laminating close rear schematic diagram.
Figure 14 is schematic diagram after cover plate of the present invention and circuit laminating.
Embodiment
As shown in Fig. 1 to 14, a kind of Graphene capacitive touch screen 100, it comprises cover layer 10, OCA optics glue-line 20 and transparent graphene conductive film layer 30, wherein, this OCA optics glue-line 20 is arranged between this cover layer 10 and this transparent graphene conductive film layer 30, and this cover layer 10 is made up of PC material.
On these transparent graphene conductive film layer 30 lower surfaces, be also provided with line layer 40.
Be provided with electrode layer 50 in these line layer 40 surroundings, this electrode layer 50 is formed by silver-colored pulp material printing, and this electrode layer 50 is in order to draw this line layer 40.
When work, at low-voltage AC electric field of the interior formation of this transparent graphene conductive film layer 30, in the time of this Graphene capacitance touch screen surfaces of user's finger touch, between finger and this transparent graphene conductive film layer 30, can form a coupling capacitance, have a certain amount of electric charge this moment and transfer to human body, for recovery charge loss, electric charge supplements into from four jiaos of this Graphene capacitive touch screen, the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, can extrapolate thus the position of touch point.
In concrete enforcement, this electrode layer 50 is by the power voltage supply of 2.8V ~ 3.3V, and supports 1.8V ~ 3.3V interface level.
The base material 31 of this transparent graphene conductive film layer 30 is by any the making in PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethylmethacrylate), glass.
The thickness of the base material 31 of this transparent graphene conductive film layer 30 is 0.125mm, 0.175mm, 0.188mm; 0.38mm, 0.5mm, 0.65mm; 0.5mm, 0.65mm; Any thickness in 0.55mm, 0.7mm, 1.1mm.
The transmittance of this transparent graphene conductive film layer 30 is 80 ~ 97.7%, and sheet resistance value is 30 ~ 400 Ω, and in concrete enforcement, the number of plies of this transparent graphene conductive film layer 30 can be that individual layer can be also multilayer.
In concrete enforcement, this Graphene capacitive touch screen of the present invention is supported standard I 2C communication interface.
As shown in Fig. 1 to 14, a kind of method for making of Graphene capacitive touch screen, it comprises the steps:
The first step: transparent graphene conductive film is cut to blanking.
Transparent graphene conductive film is cut into the required size of typesetting, the problem should be noted that in the process of cutting, the one, typesetting utilization factor maximizes, and the 2nd, the size unification of cutting is conducive to the processing and manufacturing of back segment operation, ensure to make precision, reduce the registering error of serigraphy.
In the process of cutting, cutting the operating pressure that the air pressure of blanking machine need to reach is 5bar ± 1, and the tension force of cutting blanking machine is controlled within the scope of 0.65 ~ 0.75N.
In concrete enforcement, be adopt blanking machine to cut blanking or adopt the blanking of laser machine, can decide according to supplied materials fabric width.Object is exactly to guarantee the uniqueness of size.
If adopt the blanking of laser machine, laser power is 20.8W, speed 15mm/s, PPI 400, DPI 1000.
Second step: aging to having divided the transparent graphene conductive film cutting to shrink in the first step.
Transparent graphene conductive film after cutting is fixed on glass with high temperature resistant adhesive tape, temperature in case to be baked reaches 80 while spending, advance baking box to carry out high temperature shrink transparent graphene conductive film aging, baking temperature is controlled at 135 degree, and baking time is controlled at 50 minutes.
After baking, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 80 degree, just transparent graphene conductive film is taken out from baking box, can ensure its flatness by this cooling method, guarantee that back segment operation adds simultaneously and can not cause harmful effect to it man-hour, as size distortion, edge warp, resistance fluctuation etc.
As shown in Figure 5, complete aging to the shrink of transparent graphene conductive film after, the work that each piece transparent graphene conductive film is measured to sheet resistance, 5 sheet resistance values (1,2,3,4,5 positions in Fig. 5) of measuring four angles and the centre position of each piece transparent graphene conductive film, resistance fluctuation range is certified products in positive and negative 50 Ω.
The 3rd step: clean having completed the aging transparent graphene conductive film that shrinks in second step with air pressure gun, republish black ink target, in the process of printing, silk-screen half tone is that 350 orders, black ink half tone thickness 8 ~ 10 μ, black ink half tone tension force 21 ~ 25N, grenadine angle 22.5 are spent, and printing baking temperature continues 10 minutes in the situation that of 70 degree.
Printing adopts the scrapers, scraper angle 15 ~ 20 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 3 ~ 8m/min of 80 degree, from version height 3 ~ 4mm.
After printing has been toasted, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 50 degree, just transparent graphene conductive film was taken out from baking box.
Substitute silver slurry with black ink, one can reduce costs, because silver paste printing ink is than black ink costliness, and the 2nd, because black target is more easily caught by the CCD camera lens of laser equipment, laser-induced thermal etching precision is high.
The 4th step: adopt the principle of laser-induced thermal etching to remove unwanted graphene conductive part.
Can adopt the principle of laser-induced thermal etching to remove unwanted graphene conductive part according to the characteristic of Graphene, thereby substitute traditional soda acid etching, make ITO figure with acid-proof ink or with etching paste, and the more environmental protection of laser-induced thermal etching processing procedure, equipment is simpler and easy, auxiliary material is more saved, operation is simpler, more convenient operation.
As shown in Figure 6, the transparent graphene conductive film of black target out of the press in the 3rd step is put on laser-induced thermal etching platform, open air draught, to inhale flat material, import and woven after job sequence, laser etching machine first catches the target of every mould and locates, then the Graphene of every mould is carried out to etching, unwanted current-carrying part is fallen in laser-induced thermal etching, simultaneously by out (Fig. 6 empty place is the graphene conductive part 61 that will remain, and filling part is the part 62 that laser-induced thermal etching is fallen) of the Etching of touch-screen active region.
In the process of laser-induced thermal etching, laser parameter is set waveform 3, power 65W, speed 2000mm/s, frequency 250kHZ, empty a 400us, the 400us that writes rapidly, the 30us that transfers, opens laser-30 us, closes laser 200us, is carved number of times twice.
After laser-induced thermal etching completes, utilize multimeter to get to 200M Ω and measure etching area and whether have impedance, illustrate that without resistance etching is clean, then measure two half adjacent triangular pattern with multimeter and have no resistance, there is no short circuit without resistance explanation interchannel, function is normal.
The 5th step: as shown in Figure 7, carry out printed silver slurry to having completed the transparent graphene conductive film after laser-induced thermal etching in the 4th step, silver slurry 71 is printed on both sides and the upside of transparent graphene conductive film.
Carrying out in the process of printed silver slurry, silk-screen half tone 350 orders, silver slurry half tone thickness 8 ~ 10 μ, wire diameter 27 μ, silver slurry half tone tension force 21 ~ 25N, grenadine angle 30 are spent, and baking temperature is controlled at 130 degree baking 40 minutes.
As shown in Figure 7, carrying out in the process of printed silver slurry, adopt 80 degree scrapers, scraper angle 20 ~ 25 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 2 ~ 5m/min, from version height 3 ~ 4mm, case temperature to be baked reaches 80 while spending, advances baking box to toast the transparent graphene conductive film that is printed with silver slurry.
After baking completes, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 80 degree, just transparent graphene conductive film was taken out from baking box.
The printed silver slurry of this step is to extract for the link tester of touch-screen active region the inside is crossed to silver slurry, reduces channel impedance, and subsequent handling binds together with FPC again.
After having toasted, silver slurry carries out hundred lattice tests, on silver slurry, draw the oblique line of multiple tracks miter angle with blade, be combined into the lines grid of 45 degree, be bonded at above grid by 3M810 test adhesive tape again, after being firmly bulldozed, at the uniform velocity tear up test tape with miter angle again, the silver slurry in lattice does not come off, and the adhesion of explanation silver slurry on Graphene base material is qualified.
Getting to 20K Ω with multimeter, measure the impedance of single line channel, as channel impedance≤20K Ω, is certified products when ring earth resistance≤200 Ω.
The 6th step: as shown in Figure 8, the transparent graphene conductive film of silver slurry out of the press in the 5th step is carried out to the work of laser circuit profile.
First placing glass paper fixing with double faced adhesive tape on laser machine platform, first use the radium-shine pairs of bit line of 3.8 ~ 5.0W low-power and circuit profile, then, open air draught, again transparent graphene conductive film is placed up, aimed at pairs of bit line and carry out again the work of laser profile.
In carrying out the work of laser profile, laser power is 20.8W, speed 15mm/s, PPI 400, DPI 1000.Ensure that circuit profile can not have yellow limit and want level and smooth.
The 7th step: transparent graphene conductive film and the FPC of radium-shine good required circuit profile in the 6th step are bound.
First, the ACF thick 18 μ, 1.2mm is wide is pasted at FPC pressing golden finger place, ACF must paste the place of windowing at FPC Copper Foil between two parties.
The then position of lifting one's head at circuit by FPC precompressed, then carry out localization tool, adjust flatness and the position of thermal head, finally carry out pressing by pulse hot press.
Pulse hot press parameter list is:
| Initial temperature | Release temperature | One section of temperature | Two sections of temperature | Heating-up time 1 | Heating-up time 2 | Hold the temperature time 1 | Hold the temperature time 2 | Atmospheric pressure value 1 | Atmospheric pressure value 2 |
| 100 degree | 100 degree | 160 degree | 165 degree | 1 second | 1 second | 2 seconds | 10 seconds | 0.7Pa | 1 Pa |
After hot pressing completes, sealing on the junction point of FPC and circuit, is used for fixing FPC(and sees Fig. 9).
With FPC tension tester test pulling force: vertical 90 ° of directions apply the not peelable (see figure 10) of 500 gram forces; It is certified products that 180 ° of directions of level apply 1000 gram forces not peelable (seeing Figure 11).
The 8th step: by having bound the transparent graphene conductive film of FPC in the 7th step, be connected to computer by SIU development board, more whether enter engineering debug pattern to go to detect the data of each passage normal by developing software.
The test of ruling again, sees whether lines show normally.
Generally can draw " mouth " square, then draw " X " and come the quality of detection line.
The 9th step: polycarbonate, English name Polycarbonate, is called for short PC, and the present invention adopts PC as cover plate materials.
As shown in figure 12, make PC cover plate materials, first, tear the diaphragm of PC printing surface, at its printing surface process black ink 84, produce needed touch viewing area 81, key icon 82, camera form 83.
In the process of process black ink, silk-screen half tone 350 orders, half tone thickness 8 ~ 10 μ, half tone tension force 21 ~ 25N, grenadine angle 45 are spent, and baking temperature 70 degree continue 10 minutes.
Printing adopts 80 degree scrapers, scraper angle 15 ~ 20 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 3 ~ 8m/min, from version height 3 ~ 4mm.
The tenth step: print many one decks black ink on the PC cover plate in the 9th step, its objective is in order to increase ink light-proofness and to fill up some little pin holes.
In the process of printing, silk-screen half tone 350 orders, half tone thickness 8 ~ 10 μ, half tone tension force 21 ~ 25N, grenadine angle 45 are spent, and baking temperature 70 is spent 30 minutes duration.
Printing adopts 80 degree scrapers, scraper angle 15 ~ 20 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 3 ~ 8m/min, from version height 3 ~ 4mm.
Test ink adhesion is carried out in the hundred lattice tests by the 5th step after having toasted, qualified to guarantee printed ink adhesion.
The 11 step: make optical clear glue-line.
OCA has another name called optical lens gelatin, and it holds size according to typesetting design successfully with blanking machine, and blanking machine air pressure reaches in the situation of nominal operation pressure 5bar ± 1 can carry out work, and tension force is controlled within the scope of 0.7 ~ 0.85N.
By the method fluting borehole of OCA layer 20 use laser, the binding position of FPC and camera hole site are available again, to reduce difference in height and to increase transmittance.
Carry out OCA radium-shine in, it is release facing down easily, opens air draught, and OCA is put in board centre position, laser power is 20W, speed 13mm/s, PPI 400, DPI 1000.Radium-shine complete rear eliminating waste material, and clean.
The 12 step: the PC cover plate that the radium-shine good OCA layer of the 11 step and the tenth step are printed is puted up greatly and closed, manually to fitting with laminating machine behind good position.
In the process of laminating, control laminating speed 20 ~ 25m/min, pressure 0.1 ~ 0.2kg.Laminating process will be controlled cleanliness factor well, in order to avoid cause cosmetic damage.
The 13 step: the work of cutting profile and digging receiver hole putting up greatly the PC cover plate that gets togather in the 12 step.
In concrete enforcement, adopt CNC numerical control machining center to cut profile and dig receiver hole.
In specific works, first accomplish fluently pilot hole with tapping and plugging machine, set CNC cutting parameter speed of feed 120%, the speed of mainshaft 100%, tool selection Φ 1.0*0.65*90 degree, cut after profile and check size whether to meet the requirements by slide calliper rule and Quadratic Finite Element.Soft flocks, the dirt pits (seeing Figure 13) on clean face version surrounding and surface.
The 14 step: by the 13 step cut the PC cover plate of profile and the 8th step after tested qualified transparent graphene conductive film chip mounter carry out small pieces laminating.
Before laminating, first radium-shine good localization tool, guarantees aligning accuracy.On chip mounter, on an air-suction table, first put the 8th step qualified transparent graphene conductive film after tested well, on another air-suction table, put the PC cover plate of the 13 step well, tear the release film on OCA layer, then fit.
Laminating setting parameter atmospheric pressure value 0.45Bar, pace 1000mm/s, return speed 200mm/s, 10*100ms flip-flop transition (seeing Figure 14).
The 15 step: the product that the 14 step is posted carries out deaeration.
Every flake products is inserted in static box, deliver to de-bubble in defoamer.Arrange that defoamer temperature 40 is spent, air pressure 5kg, 40 minutes time.
After de-bubble, check steam bubble has not whether removal and graphene conductive layer have layering completely.
Therefore the graphene conductive layer that invention adopts forms by 3 layers, and in order to prevent its layering, deaeration temperature can not be too high, and pressure can not be too strong, and the time can extend relatively.
The 16 step: the Graphene product that removes good bubble in the 15 step is carried out to outward appearance wiping and inspection.Dirty and the stain of wiping, check outward appearance have or not scratch, stab, the acute tooth of ink penetration, steam bubble, foreign material, stain, white point etc. are bad.Outward appearance non-defective unit carries out Function detection again.By the method for testing of the 8th step, be connected to computer by SIU development board, more whether detect the data of each passage by developing software normal, and the test of rule, see whether lines demonstration is normal.
The 17 step: again Graphene capacitive touch screen is installed on mobile phone complete machine and sees practical effect after completing the 16 step.And carry out the optimization of IC configuration parameter, and again debug the IC configuration parameter of an applicable Graphene, make the effect of complete machine more perfect.When user's finger touch is during with the touch screen surface of Graphene, can a coupling capacitance of formation between finger and Graphene conductor layer, just have a certain amount of electric charge and transfer to human body.In order to recover these loss of charge, electric charge supplements into from four jiaos of screen, and the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, and touch-control IC can extrapolate the position of touch point thus.Graphene capacitive touch screen touch sensitivity is high, line is more smooth, user's experience sense is stronger.
Claims (10)
1. a Graphene capacitive touch screen, is characterized in that, comprises cover layer, OCA optics glue-line and transparent graphene conductive film layer, wherein, this OCA optics glue-line is arranged between this cover layer and this transparent graphene conductive film layer, and this cover layer is made up of PC material
On this transparent graphene conductive film layer lower surface, be also provided with line layer, be provided with electrode layer in this line layer surrounding, this electrode layer is formed by silver-colored pulp material printing, and this electrode layer is in order to this line layer is drawn,
When work, in this transparent graphene conductive film layer, form a low-voltage AC electric field, in the time of this Graphene capacitance touch screen surfaces of user's finger touch, finger can form a coupling capacitance with this transparent graphene conductive film interlayer, have a certain amount of electric charge this moment and transfer to human body, for recovery charge loss, electric charge supplements into from four jiaos of this Graphene capacitive touch screen, the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, can extrapolate thus the position of touch point.
2. a kind of Graphene capacitive touch screen as claimed in claim 1, is characterized in that: the base material of this transparent graphene conductive film layer is by any the making in PET, PC, PMMA, glass.
3. a kind of Graphene capacitive touch screen as claimed in claim 1, is characterized in that: the base material thickness of this transparent graphene conductive film layer is 0.125mm, 0.175mm, 0.188mm; 0.38mm, 0.5mm, 0.65mm; 0.5mm, 0.65mm; Any thickness in 0.55mm, 0.7mm, 1.1mm.
4. a kind of Graphene capacitive touch screen as claimed in claim 1, its feature exists: the transmittance of this transparent graphene conductive film layer is 80 ~ 97.7%, and sheet resistance value is 30 ~ 400 Ω.
5. a method for making for Graphene capacitive touch screen, is characterized in that, comprises the steps:
The first step: transparent graphene conductive film is cut to blanking, transparent graphene conductive film is cut into the required size of typesetting,
Second step: aging to having divided the transparent graphene conductive film cutting to shrink in the first step,
Transparent graphene conductive film after cutting is fixed on glass with high temperature resistant adhesive tape, temperature in case to be baked reaches 80 while spending, advances baking box to carry out high temperature transparent graphene conductive film and shrinks agingly, and baking temperature is controlled at 135 degree, baking time is controlled at 50 minutes
After baking, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 80 degree, just transparent graphene conductive film is taken out from baking box,
Complete aging to the shrink of transparent graphene conductive film after, the work that each piece transparent graphene conductive film is measured to sheet resistance, measure 5 sheet resistance values in four angles and the centre position of each piece transparent graphene conductive film, resistance fluctuation range is certified products in positive and negative 50 Ω
The 3rd step: clean having completed the aging transparent graphene conductive film that shrinks in second step with air pressure gun, republish black ink target, printing baking temperature continues 10 minutes in the situation that of 70 degree,
After printing has been toasted, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 50 degree, just transparent graphene conductive film is taken out from baking box,
The 4th step: adopt the principle of laser-induced thermal etching to remove unwanted graphene conductive part,
The transparent graphene conductive film of black target out of the press in the 3rd step is put on laser-induced thermal etching platform, open air draught, to inhale flat material, import and woven after job sequence, laser etching machine first catches the target of every mould and locates, and then the Graphene of every mould is carried out to etching, and unwanted current-carrying part is fallen in laser-induced thermal etching, out by the Etching of touch-screen active region simultaneously
After laser-induced thermal etching completes, utilize multimeter to get to 200M Ω and measure etching area and whether have impedance, illustrate that without resistance etching is clean, then measure two half adjacent triangular pattern with multimeter and have no resistance, there is no short circuit without resistance explanation interchannel, function is normal,
The 5th step: carry out printed silver slurry to having completed the transparent graphene conductive film after laser-induced thermal etching in the 4th step, silver slurry is printed on both sides and the upside of transparent graphene conductive film,
Carrying out in the process of printed silver slurry, baking temperature is controlled at 130 degree baking 40 minutes,
Case temperature to be baked reaches 80 while spending, advances baking box to toast the transparent graphene conductive film that is printed with silver slurry,
After baking completes, transparent graphene conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after transparent graphene conductive film surface temperature is lower than 80 degree, just transparent graphene conductive film is taken out from baking box,
The printed silver slurry of this step is to extract for the link tester of touch-screen active region the inside is crossed to silver slurry, reduces channel impedance, and subsequent handling binds together with FPC again,
After having toasted, silver slurry carries out hundred lattice tests, on silver slurry, draw the oblique line of multiple tracks miter angle with blade, be combined into the lines grid of 45 degree, be bonded at above grid by test adhesive tape again, after being firmly bulldozed, more at the uniform velocity tear up test tape with miter angle, the silver slurry in lattice does not come off, the adhesion of explanation silver slurry on Graphene base material is qualified
Getting to 20K Ω with multimeter, measure the impedance of single line channel, as channel impedance≤20K Ω, is certified products when ring earth resistance≤200 Ω,
The 6th step: the transparent graphene conductive film of silver slurry out of the press in the 5th step is carried out to the work of laser circuit profile,
First placing glass paper fixing with double faced adhesive tape on laser machine platform, first uses the radium-shine pairs of bit line of 3.8 ~ 5.0W low-power and circuit profile, then, open air draught, again transparent graphene conductive film is placed up, aimed at pairs of bit line and carry out again the work of laser profile
The 7th step: transparent graphene conductive film and the FPC of radium-shine good required circuit profile in the 6th step are bound,
First, ACF is pasted at FPC pressing golden finger place, ACF must paste the place of windowing at FPC Copper Foil between two parties,
The then position of lifting one's head at circuit by FPC precompressed, then carry out localization tool, adjust flatness and the position of thermal head, finally carry out pressing by pulse hot press,
After hot pressing completes, sealing on the junction point of FPC and circuit, is used for fixing FPC,
The 8th step: by having bound the transparent graphene conductive film of FPC in the 7th step, be connected to computer by SIU development board, more whether enter engineering debug pattern to go to detect the data of each passage normal by developing software,
The test of ruling again, sees whether lines show normally,
The 9th step: make PC cover plate materials, first, tear the diaphragm of PC printing surface, at its printing surface process black ink, produce needed touch viewing area and key icon, baking temperature 70 is spent 10 minutes duration,
The tenth step: on the PC cover plate in the 9th step, print many one decks black ink, its objective is that baking temperature 70 is spent 30 minutes duration in order to increase ink light-proofness and to fill up some little pin holes,
Test ink adhesion is carried out in the hundred lattice tests by the 5th step after having toasted, qualified to guarantee printed ink adhesion,
The 11 step: make optical clear glue-line,
Hold size according to typesetting design successfully with blanking machine, blanking machine air pressure reaches in the situation of nominal operation pressure 5bar ± 1 can carry out work, and tension force is controlled within the scope of 0.7 ~ 0.85N,
Method fluting borehole by OCA layer with laser, is available the binding position of FPC and camera hole site, to reduce difference in height and to increase transmittance,
Carry out OCA radium-shine in, it is release facing down easily, opens air draught, OCA is put in board centre position, radium-shine complete rear eliminating waste material, and cleaning,
The 12 step: the PC cover plate that the radium-shine good OCA layer of the 11 step and the tenth step are printed is puted up greatly and closed, manually to fitting with laminating machine behind good position,
In the process of laminating, control laminating speed 20 ~ 25m/min, pressure 0.1 ~ 0.2kg, laminating process will be controlled cleanliness factor well, in order to avoid cause cosmetic damage,
The 13 step: the work of cutting profile and digging receiver hole putting up greatly the PC cover plate that gets togather in the 12 step,
The 14 step: by the 13 step cut the PC cover plate of profile and the 8th step after tested qualified transparent graphene conductive film chip mounter carry out small pieces laminating,
First radium-shine good localization tool before laminating, guarantees aligning accuracy, first puts the 8th step qualified transparent graphene conductive film after tested on chip mounter on an air-suction table well, on another air-suction table, put the PC cover plate of the 13 step well, tear the release film on OCA layer, then fit
Laminating setting parameter atmospheric pressure value 0.45Bar, pace 1000mm/s, return speed 200mm/s, flip-flop transition 10*100ms,
The 15 step: the product that the 14 step is posted carries out deaeration,
Every flake products is inserted in static box, delivers to de-bubble in defoamer,
Arrange that defoamer temperature 40 is spent, air pressure 5kg, 40 minutes time,
After de-bubble, check steam bubble has not removal and graphene conductive layer completely whether to have layering,
The 16 step: the Graphene product that removes good bubble in the 15 step is carried out to outward appearance wiping and inspection, dirty and the stain of wiping, check outward appearance have or not scratch, stab, the acute tooth of ink penetration, steam bubble, foreign material, stain, white point etc. are bad, outward appearance non-defective unit carries out Function detection again, by the method for testing of the 8th step, is connected to computer by SIU development board, whether the data that detect again each passage by developing software are normal, and the test of ruling, see whether lines show normal
The 17 step: complete again Graphene capacitive touch screen to be installed to after the 16 step and see practical effect on mobile phone complete machine, and carry out the optimization of IC configuration parameter, again debug the IC configuration parameter of an applicable Graphene, make the effect of complete machine more perfect, when user's finger touch is during with the touch screen surface of Graphene, between finger and Graphene conductor layer, can form a coupling capacitance, just have a certain amount of electric charge and transfer to human body, in order to recover these loss of charge, electric charge supplements into from four jiaos of screen, the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, touch-control IC can extrapolate the position of touch point thus, Graphene capacitive touch screen touch sensitivity is high, rule more smooth, user's experience sense is stronger.
6. the method for making of a kind of Graphene capacitive touch screen as claimed in claim 5, its feature exists: in the 3rd step printing process in, silk-screen half tone is that 350 orders, black ink half tone thickness 8 ~ 10 μ, black ink half tone tension force 21 ~ 25N, grenadine angle 22.5 are spent, printing adopts the scrapers, scraper angle 15 ~ 20 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 3 ~ 8m/min of 80 degree, from version height 3 ~ 4mm
In the 5th step carrying out in the process of printed silver slurry, silk-screen half tone 350 orders, silver slurry half tone thickness 8 ~ 10 μ, wire diameter 27 μ, silver slurry half tone tension force 21 ~ 25N, grenadine angle 30 are spent, and adopt 80 degree scrapers, scraper angle 20 ~ 25 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 2 ~ 5m/min, from version height 3 ~ 4mm.
7. the method for making of a kind of Graphene capacitive touch screen as claimed in claim 5, its feature exists: in the 4th step in the process of laser-induced thermal etching, laser parameter is set waveform 3, power 65W, speed 2000mm/s, frequency 250kHZ, empty a 400us, the 400us that writes rapidly, the 30us that transfers, opens laser-30 us, closes laser 200us, is carved number of times twice
In the 6th step, in carrying out the work of laser profile, laser power is 20.8W, speed 15mm/s, PPI 400, DPI 1000, ensures that circuit profile can not have yellow limit and want level and smooth,
In the 11 step, laser power is 20W, speed 13mm/s, PPI 400, DPI 1000.
8. the method for making of a kind of Graphene capacitive touch screen as claimed in claim 5, its feature exists: the ACF in the 7th step is that 18 μ are thick, 1.2mm is wide, with FPC tension tester test pulling force: it is not peelable that vertical 90 ° of directions apply 500 gram forces, and it is certified products that 180 ° of directions of level apply 1000 gram forces not peelable.
9. the method for making of a kind of Graphene capacitive touch screen as claimed in claim 5, its feature exists: in the 9th step in the process of process black ink, silk-screen half tone 350 orders, half tone thickness 8 ~ 10 μ, half tone tension force 21 ~ 25N, grenadine angle 45 are spent, baking temperature 70 degree continue 10 minutes, printing adopts 80 degree scrapers, scraper angle 15 ~ 20 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 3 ~ 8m/min, from version height 3 ~ 4mm
In the tenth step printing process in, silk-screen half tone 350 orders, half tone thickness 8 ~ 10 μ, half tone tension force 21 ~ 25N, grenadine angle 45 are spent, and printing adopts 80 degree scrapers, scraper angle 15 ~ 20 degree, scraper gradient 0 ~ 15 degree, scraper pressure 2 ~ 3kg, scraper speed 3 ~ 8m/min, from version height 3 ~ 4mm.
10. the method for making of a kind of Graphene capacitive touch screen as claimed in claim 5, its feature exists: in the 13 step, adopt CNC numerical control machining center to cut profile and dig receiver hole, first accomplish fluently pilot hole with tapping and plugging machine, set CNC cutting parameter speed of feed 120%, the speed of mainshaft 100%, tool selection Φ 1.0*0.65*90 degree, after cutting profile, check size whether to meet the requirements by slide calliper rule and Quadratic Finite Element, clean soft flocks, the dirt pits on face version surrounding and surface.
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Application publication date: 20140903 |