CN104049826A - Carbon nano-tube capacitive touch screen and manufacturing method thereof - Google Patents
Carbon nano-tube capacitive touch screen and manufacturing method thereof Download PDFInfo
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- CN104049826A CN104049826A CN201410295246.6A CN201410295246A CN104049826A CN 104049826 A CN104049826 A CN 104049826A CN 201410295246 A CN201410295246 A CN 201410295246A CN 104049826 A CN104049826 A CN 104049826A
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Abstract
The invention relates to a carbon nano-tube capacitive touch screen and a manufacturing method of the carbon nano-tube capacitive touch screen. The carbon nano-tube capacitive touch screen structurally comprises a cover plate layer, an OCA optical adhesive layer and a transparent carbon nano-tube conductive film layer, a circuit layer is further arranged on the lower surface of the transparent carbon nano-tube conductive film layer, and an electrode layer is arranged on the periphery of the circuit layer and used for leading out the circuit layer. In the work process, a low-voltage alternating-current electric field is formed in the transparent carbon nano-tube conductive film layer, when a user touches the surface of the carbon nano-tube capacitive touch screen with one finger, a coupling capacitor will be formed between the finger and the transparent carbon nano-tube conductive film layer, a certain amount of charges will be transferred to the human body, in order to compensate charge loss, the charges are supplemented from the four corners of the carbon nano-tube capacitive touch screen, the amount of the charges supplemented in all the directions are in proportion to the distance of a touch point, and therefore the position of the touch 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 CNT and structure and the technological method for processing formulated.
Background technology
As everyone knows, CNT is by the curling seamless hollow tubular structure forming of CNT lamella.Have excellent electric property, high strength and pliability, stable chemical property and visible ray and near infrared light are not had to the characteristics such as obvious characteristic absorption, the film consisting of it is a kind of super flexibility " transparent " conductor.In addition, this film also have that cost is low, environmental friendliness, resourceful advantage.Current result of study proved carbon nanotube film have can be comparable with ITO transparent conductivity, also be considered to be hopeful most to replace resource shortage, fragility ITO, become one of material of nesa coating of new generation, not only can meet the growing demands of industry to nesa coating such as touch-screen, demonstration, solar cell, and to promoting the development of flexible device of new generation to have great importance.
Different according to the number of plies, CNT can be divided into single wall, double-walled and multiple-wall carbon nanotube.These CNTs can be in CVD growth course direct formation of film at surface, then transfer to and on transparent base, form transparent conductive film; Also can be distributed to equably in a certain solvent and form dispersion liquid, then this dispersion liquid be adopted and filter transfer method, lift the techniques such as dip coating, spraying process, spin-coating method, electrophoretic deposition, layer assembly method and in transparent substrates, be deposited as film.In addition, these CNTs can also with the compound transparent conductive films of making such as CNT or conducting polymer.In concrete enforcement, generally by following mode, manufacture.
Production method one:
Adopt Single Walled Carbon Nanotube transparent conductive film as transparency electrode.Film transmittance is between 80 ~ 90%, and surface resistance is at 70 ~ 200 ohm.sq
-1between.
Production method two:
Adopt double-walled carbon nano-tube transparent conductive film as transparency electrode.Film transmittance is between 85 ~ 90%, and surface resistance is at 50 ~ 150 ohm.sq
-1between.
Production method three:
Adopt multi-walled carbon nano-tubes transparent conductive film as transparency electrode.Film transmittance is between 85 ~ 90%, and surface resistance is at 250 ~ 300 ohm.sq
-1between.
Production method four:
Adopt the compound transparent conductive film of Single Walled Carbon Nanotube and poly-3,4-ethylene dioxythiophene/poly styrene sulfonate (PEDOT:PSS) as transparency electrode.Film transmittance is between 80 ~ 90%, and surface resistance is at 100 ~ 300 ohm.sq
-1between.
Production method five:
Adopt the compound transparent conductive film of Single Walled Carbon Nanotube and two layers of CNT as transparency electrode.Film transmittance is between 85 ~ 90%, and surface resistance is at 180 ~ 250 ohm.sq
-1between.
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, and 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 a kind of as in new material of CNT, it has the advantage can not be substituted equally making aspect touch-screen.Following CNT and existing ITO conductive material are compared, CNT has excellent electric property, high strength and pliability, stable chemical property and visible ray and near infrared light is not had to the characteristics such as obvious characteristic absorption, also have that cost is low, environmental friendliness, resourceful advantage, these advantages all will show that CNT also 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 CNT is as " transparent " conductor of a kind of super flexibility, can overcome the shortcoming of traditional material.
Summary of the invention
The invention provides a kind of CNT capacitive touch screen and preparation method thereof, it utilizes nano carbon tube material to be made into CNT capacitive touch screen, compare with traditional material, be easier to observe and check, adopting Petting Area to add periphery cabling with CNT starches as wire with silver, 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 CNT capacitive touch screen, comprise cover layer, OCA optics glue-line and CNT transparent conductive film layer, wherein, this OCA optics glue-line is arranged between this cover layer and this CNT transparent conductive film layer, this cover layer is made by PC material, on this CNT transparent conductive film layer lower surface, be also provided with line layer, in this line layer surrounding, be provided with electrode layer, this electrode layer is formed by silver-colored pulp material printing, this electrode layer is in order to draw this line layer, during work, in this CNT transparent conductive film layer, form a low-voltage AC electric field, when this CNT capacitance touch screen surfaces of user's finger touch, finger can form a coupling capacitance with this CNT transparent 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 CNT capacitive touch screen, the quantity of electric charge that all directions are supplementary and the distance of touch point are proportional, can extrapolate the position of touch point thus.
A method for making for CNT capacitive touch screen, comprises the steps:
The first step: CNT transparent conductive film is cut to blanking, CNT transparent conductive film is cut into the required size of typesetting.
Second step: to having divided the CNT transparent conductive film cutting to shrink aging in the first step, CNT transparent conductive film after cutting is fixed on glass with high temperature resistant adhesive tape, temperature in case to be baked reaches 80 while spending, advancing baking box to carry out high temperature CNT transparent conductive film shrinks aging, baking temperature is controlled at 135 degree, baking time is controlled at 50 minutes, after baking, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 80 degree, just CNT transparent conductive film is taken out from baking box, complete aging to the shrink of CNT transparent conductive film after, the work that each piece CNT transparent conductive film is measured to sheet resistance, measure 5 sheet resistance values in four angles and the centre position of each piece CNT transparent conductive film, it is certified products that resistance fluctuation range be take interior at positive and negative 50 Ω.
The 3rd step: clean having completed the CNT transparent conductive film that shrinks aging 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, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 50 degree, just CNT transparent conductive film is taken out from baking box.
The 4th step: adopt the principle of laser-induced thermal etching to remove unwanted CNT current-carrying part, the CNT transparent 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, importing has woven after job sequence, laser etching machine first catches the target of every mould and locates, then the CNT 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 measurement etching area and whether have impedance, without resistance, illustrate that etching is clean, with multimeter, measure two half adjacent triangular pattern again and have no resistance, without resistance explanation interchannel, there is no short circuit, function is normal.
The 5th step: carry out printed silver slurry to having completed the CNT transparent conductive film after laser-induced thermal etching in the 4th step, silver slurry is printed on both sides and the upside of CNT transparent conductive film, in carrying out 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, advance baking box to toast the CNT transparent conductive film that is printed with silver slurry, after baking completes, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 80 degree, just CNT transparent 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, reduce channel impedance, subsequent handling binds together with FPC again, after having toasted, silver slurry carries out hundred lattice tests, with blade, on silver slurry, draw the oblique line of multiple tracks miter angle, be combined into the lines grid of 45 degree, by 3M810 test adhesive tape, be bonded at above grid again, after being firmly bulldozed, with miter angle, at the uniform velocity tear up test tape again, silver slurry in lattice does not come off, the adhesion of explanation silver slurry on CNT is qualified, with multimeter, get to 20K Ω, measure the impedance of single line channel, as channel impedance≤20K Ω, in the time of ring earth resistance≤200 Ω, be certified products.
The 6th step: the CNT transparent 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 CNT transparent conductive film is placed up, aimed at pairs of bit line and carry out again the work of laser profile.
The 7th step: CNT transparent 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, and ACF must paste the place of windowing at FPC Copper Foil between two parties, then the position of lifting one's head at circuit by FPC precompressed, carry out again localization tool, adjust flatness and the position of thermal head, finally by pulse hot press, carry out pressing, after hot pressing completes, sealing on the junction point of FPC and circuit, is used for fixing FPC.
The 8th step: will bind the CNT transparent conductive film of FPC in the 7th step, by SIU development board, be connected to computer, whether by developing software, entering engineering debug pattern, to go to detect the data of each passage normal again, then the test of ruling, and 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 in order to increase ink light-proofness and to fill up some little pin holes, baking temperature 70 is spent 30 minutes duration, 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, according to typesetting design, with blanking machine, hold size successfully, blanking machine air pressure reaches in the situation of nominal operation pressure 5bar ± 1 can carry out work, tension force is controlled within the scope of 0.7 ~ 0.85N, method fluting borehole by OCA layer with laser, the binding position of FPC and camera hole site are available, 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, 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.
The 14 step: by the 13 step cut the PC cover plate of profile and the 8th step after tested qualified CNT transparent conductive film with 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 CNT transparent 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, defoamer temperature 40 degree, air pressure 5kg, 40 minutes time are set, after de-bubble, check steam bubble has not whether removal and CNT conductive layer have layering completely.
The 16 step: the CNT product except good bubble in the 15 step is carried out to outward appearance wiping and check, 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, by SIU development board, be connected to computer, more whether by developing software, detect the data of each passage normal, and the test of ruling, see whether lines show normal.
The 17 step: complete again CNT 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 CNT, make the effect of complete machine more perfect, when user's finger touch is during with the touch screen surface of CNT, between finger and CNT 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, CNT capacitive touch screen touch sensitivity is high, rule more smooth, user's experience sense is stronger.
Beneficial effect of the present invention is: the method by the transparent conductive film with CNT by laser-induced thermal etching processes circuit pack, by binding FPC by the connection of the inside to mainboard end, on CNT surface, paste one deck OCA again, finally cover plate is pasted on nano carbon tube material, be combined into a slice capacitive touch screen.This touch-screen controls to realize touch function by touch-control IC and complete machine mainboard.CNT capacitive touch screen is arranged on above display screen, for detection of the position touching, when capacitance plate touches, just by touch-control IC, resolved the position coordinates of contact, 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 " CNT ".For it, have excellent electric property, high strength and pliability, stable chemical property and visible ray and near infrared light are not had to the characteristics such as obvious characteristic absorption, 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 CNT capacitive touch screen of high stability, can also experience some aspects that CNT capacitive touch screen is better than now conventional ITO touch-screen: 1, CNT capacitive touch screen of the present invention has adopted CNT as main composition material, compare 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, CNT capacitive touch screen of the present invention has adopted CNT 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, CNT capacitive touch screen of the present invention has adopted CNT as main composition material, because CNT has very high deflection degree, has so just greatly reduced as ITO material because bending the situation that excessively causes dysfunction.
Accompanying drawing explanation
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 whole composition diagram of the present invention.
Fig. 5 is that the present invention detects CNT sheet resistance value schematic diagram.
Fig. 6 is laser-induced thermal etching CNT area schematic of the present invention.
Fig. 7 is screen printed electrode layer of the present invention and CNT overlap joint schematic diagram.
Fig. 8 is CNT 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 CNT capacitive touch screen 100, it comprises cover layer 10, OCA optics glue-line 20 and CNT transparent conductive film layer 30, wherein, this OCA optics glue-line 20 is arranged between this cover layer 10 and this CNT transparent conductive film layer 30, and this cover layer 10 is made by PC material.
On these CNT transparent conductive film layer 30 lower surfaces, be also provided with line layer 40.
In these line layer 40 surroundings, be provided with electrode layer 50, 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.
During work, at low-voltage AC electric field of the interior formation of this CNT transparent conductive film layer 30, when this CNT capacitance touch screen surfaces of user's finger touch, finger and this 30, CNT transparent conductive film layer 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 CNT 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.
Any make of the base material 31 of this CNT transparent conductive film layer 30 in PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethylmethacrylate), glass.
The thickness of the base material 31 of this CNT transparent 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 CNT transparent conductive film layer 30 is 80 ~ 97.7%, and sheet resistance value is 30 ~ 400 Ω, and in concrete enforcement, the number of plies difference of this CNT transparent conductive film layer 30 can be divided into single wall, double-walled and multiple-wall carbon nanotube.
In concrete enforcement, this CNT 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 CNT capacitive touch screen, it comprises the steps:
The first step: CNT transparent conductive film is cut to blanking.
CNT transparent 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, guarantee 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: to having divided the CNT transparent conductive film cutting to shrink aging in the first step.
CNT transparent 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 CNT transparent conductive film aging, baking temperature is controlled at 135 degree, and baking time is controlled at 50 minutes.
After baking, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 80 degree, just CNT transparent conductive film is taken out from baking box, by this cooling method, can guarantee its flatness, 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 CNT transparent conductive film after, the work that each piece CNT transparent 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 CNT transparent conductive film, it is certified products that resistance fluctuation range be take interior at positive and negative 50 Ω.
The 3rd step: clean having completed the CNT transparent conductive film that shrinks aging in second step with air pressure gun, republish black ink target, in the process of printing, silk-screen half tone is 350 orders, black ink half tone thickness 8 ~ 10 μ, black ink half tone tension force 21 ~ 25N, grenadine angle 22.5 degree, 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, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 50 degree, just CNT transparent conductive film was taken out from baking box.
With black ink, substitute silver slurry, one can reduce costs, because silver paste printing ink is more expensive than black ink, 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 CNT current-carrying part.
Characteristic according to CNT can adopt the principle of laser-induced thermal etching to remove unwanted CNT current-carrying part, thereby substituted traditional soda acid etching, with acid-proof ink or with etching paste, make ITO figure, 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 CNT transparent 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, importing has woven after job sequence, laser machine first catches the target of every mould and locates, then the CNT of every mould is carried out to etching, unwanted current-carrying part is fallen in laser-induced thermal etching, simultaneously by the Etching of touch-screen active region out (Fig. 6 empty place is the CNT current-carrying part 61 that will remain, and filling part is the part 62 that laser-induced thermal etching is fallen).
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.
Whether have impedance, illustrate that etching is clean, then have no resistance by two half adjacent triangular pattern of multimeter measurement there is no short circuit without resistance explanation interchannel without resistance if after laser-induced thermal etching completes, utilizing multimeter to get to 200M Ω measurement etching area, function is normal.
The 5th step: as shown in Figure 7, carry out printed silver slurry to having completed the CNT transparent conductive film after laser-induced thermal etching in the 4th step, silver slurry 71 is printed on both sides and the upside of CNT transparent conductive film.
In carrying out 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 degree, baking temperature is controlled at 130 degree baking 40 minutes.
As shown in Figure 7, in carrying out 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, and advances baking box to toast the CNT transparent conductive film that is printed with silver slurry.
After baking completes, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 80 degree, just CNT transparent 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, with blade, on silver slurry, draw the oblique line of multiple tracks miter angle, be combined into the lines grid of 45 degree, by 3M810 test adhesive tape, be bonded at above grid again, after being firmly bulldozed, with miter angle, at the uniform velocity tear up test tape again, the silver slurry in lattice does not come off, and the adhesion of explanation silver slurry on CNT is qualified.
With multimeter, getting to 20K Ω, measure the impedance of single line channel, as channel impedance≤20K Ω, is certified products in the time of ring earth resistance≤200 Ω.
The 6th step: as shown in Figure 8, the CNT transparent 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 CNT transparent conductive film is placed up, aimed at pairs of bit line and carry out again the work of laser profile.
When carrying out the work of laser profile, laser power is 20.8W, speed 15mm/s, PPI 400, DPI 1000.Guarantee that circuit profile can not have yellow limit and want level and smooth.
The 7th step: CNT transparent conductive film and the FPC of radium-shine good required circuit profile in the 6th step are bound.
First, 18 μ are thick, 1.2mm is wide ACF pastes at FPC pressing golden finger place, and ACF must paste the place of windowing at FPC Copper Foil between two parties.
The position of lifting one's head at circuit by FPC precompressed then, then carry out localization tool, adjust flatness and the position of thermal head, finally by pulse hot press, carry out pressing.
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 CNT transparent 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 the quality that " X " carrys out 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 degree, 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 degree, 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 in 0.7 ~ 0.85 scope.
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 with tapping and plugging machine, accomplish fluently pilot hole, set CNC cutting parameter speed of feed 120%, the speed of mainshaft 100%, tool selection Φ 1.0*0.65*90 degree, by slide calliper rule and Quadratic Finite Element, check size whether to meet the requirements after cutting profile.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 CNT transparent conductive film with 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 CNT transparent 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.Defoamer temperature 40 degree, air pressure 5kg, 40 minutes time are set.
After de-bubble, check steam bubble has not whether removal and CNT conductive layer have layering completely.
Therefore the CNT conductive layer that invention adopts is comprised of double-walled, 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 CNT product except good bubble in the 15 step is carried out to outward appearance wiping and check.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, by SIU development board, be connected to computer, more whether by developing software, detect the data of each passage normal, and the test of rule, see whether lines demonstration is normal.
The 17 step: again CNT 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 CNT, make the effect of complete machine more perfect.When user's finger touch is during with the touch screen surface of CNT, can a coupling capacitance of formation between finger and CNT 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.CNT capacitive touch screen touch sensitivity is high, line is more smooth, user's experience sense is stronger.
Claims (10)
1. a CNT capacitive touch screen, is characterized in that, comprises cover layer, OCA optics glue-line and CNT transparent conductive film layer, wherein, this OCA optics glue-line is arranged between this cover layer and this CNT transparent conductive film layer, and this cover layer is made by PC material
On this CNT transparent conductive film layer lower surface, be also provided with line layer, in this line layer surrounding, be provided with electrode layer, this electrode layer is formed by silver-colored pulp material printing, and this electrode layer is in order to this line layer is drawn,
During work, in this CNT transparent conductive film layer, form a low-voltage AC electric field, when this CNT capacitance touch screen surfaces of user's finger touch, finger can form a coupling capacitance with this CNT transparent 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 CNT 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 CNT capacitive touch screen as claimed in claim 1, is characterized in that: any make of the base material of this CNT transparent conductive film layer in PET, PC, PMMA, glass.
3. a kind of CNT capacitive touch screen as claimed in claim 1, is characterized in that: the base material thickness of this CNT transparent 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 CNT capacitive touch screen as claimed in claim 1, its feature exists: the transmittance of this CNT transparent conductive film layer is 80 ~ 97.7%, and sheet resistance value is 30 ~ 400 Ω.
5. a method for making for CNT capacitive touch screen, is characterized in that, comprises the steps:
The first step: CNT transparent conductive film is cut to blanking, CNT transparent conductive film is cut into the required size of typesetting,
Second step: aging to having divided the CNT transparent conductive film cutting to shrink in the first step,
CNT transparent conductive film after cutting is fixed on glass with high temperature resistant adhesive tape, temperature in case to be baked reaches 80 while spending, and advances baking box to carry out high temperature CNT transparent conductive film and shrinks agingly, and baking temperature is controlled at 135 degree, baking time is controlled at 50 minutes
After baking, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 80 degree, just CNT transparent conductive film is taken out from baking box,
Complete aging to the shrink of CNT transparent conductive film after, the work that each piece CNT transparent conductive film is measured to sheet resistance, measure 5 sheet resistance values in four angles and the centre position of each piece CNT transparent conductive film, it is certified products that resistance fluctuation range be take interior at positive and negative 50 Ω
The 3rd step: clean having completed the CNT transparent conductive film that shrinks aging 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, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 50 degree, just CNT transparent conductive film is taken out from baking box,
The 4th step: adopt the principle of laser-induced thermal etching to remove unwanted CNT current-carrying part,
The CNT transparent 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, importing has woven after job sequence, laser etching machine first catches the target of every mould and locates, and then the CNT 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
Whether have impedance, illustrate that etching is clean, then have no resistance by two half adjacent triangular pattern of multimeter measurement there is no short circuit without resistance explanation interchannel without resistance if after laser-induced thermal etching completes, utilizing multimeter to get to 200M Ω measurement etching area, function is normal,
The 5th step: carry out printed silver slurry to having completed the CNT transparent conductive film after laser-induced thermal etching in the 4th step, silver slurry is printed on both sides and the upside of CNT transparent conductive film,
In carrying out 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, and advances baking box to toast the CNT transparent conductive film that is printed with silver slurry,
After baking completes, CNT transparent conductive film was lowered the temperature after 5 ~ 10 minutes in baking box, after CNT transparent conductive film surface temperature is lower than 80 degree, just CNT transparent 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, with blade, on silver slurry, draw the oblique line of multiple tracks miter angle, be combined into the lines grid of 45 degree, by test adhesive tape, be bonded at above grid 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 CNT base material is qualified
With multimeter, getting to 20K Ω, measure the impedance of single line channel, as channel impedance≤20K Ω, is certified products in the time of ring earth resistance≤200 Ω,
The 6th step: the CNT transparent 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 CNT transparent conductive film is placed up, aimed at pairs of bit line and carry out again the work of laser profile
The 7th step: CNT transparent 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 position of lifting one's head at circuit by FPC precompressed then, then carry out localization tool, adjust flatness and the position of thermal head, finally by pulse hot press, carry out pressing,
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 CNT transparent conductive film of FPC in the 7th step, by SIU development board, be connected to computer, more whether by developing software, entering engineering debug pattern, to go to detect the data of each passage normal,
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,
According to typesetting design, with blanking machine, hold size successfully, 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 CNT transparent conductive film with chip mounter, carry out small pieces laminating,
First radium-shine good localization tool before laminating, guarantees aligning accuracy, first puts the 8th step qualified CNT transparent 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,
Defoamer temperature 40 degree, air pressure 5kg, 40 minutes time are set,
After de-bubble, check steam bubble has not removal and CNT conductive layer completely whether to have layering,
The 16 step: the CNT product except good bubble in the 15 step is carried out to outward appearance wiping and check, 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, by SIU development board, is connected to computer, 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 CNT 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 CNT, make the effect of complete machine more perfect, when user's finger touch is during with the touch screen surface of CNT, between finger and CNT 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, CNT 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 CNT capacitive touch screen as claimed in claim 5, its feature exists: in the 3rd step printing process in, silk-screen half tone is 350 orders, black ink half tone thickness 8 ~ 10 μ, black ink half tone tension force 21 ~ 25N, grenadine angle 22.5 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
In the 5th step in carrying out 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 degree, 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 CNT 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, when carrying out the work of laser profile, laser power is 20.8W, speed 15mm/s, PPI 400, DPI 1000, guarantees 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 CNT 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, 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 CNT 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 degree, 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 degree, 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 CNT 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 with tapping and plugging machine, accomplish fluently pilot hole, 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, by slide calliper rule and Quadratic Finite Element check size, whether meet the requirements, soft flocks, the dirt pits on clean face version surrounding and surface.
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| CN105930015A (en) * | 2016-04-13 | 2016-09-07 | 苏州触动电子科技有限公司 | Novel capacitance touch panel manufacture method |
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| CN113703612B (en) * | 2021-08-30 | 2023-09-22 | 业成科技（成都）有限公司 | Touch button and touch device |
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| CN114076732B (en) * | 2021-09-24 | 2024-01-30 | 杭州天丰光电科技股份有限公司 | Incoming material detection process of hidden screen colorful touch film |
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| Publication number | Publication date |
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| CN204087182U (en) | 2015-01-07 |
| CN104049826B (en) | 2017-07-28 |
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