CN104049826B - Carbon nanotube capacitive touch screen and manufacturing method thereof - Google Patents
Carbon nanotube capacitive touch screen and manufacturing method thereof Download PDFInfo
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- CN104049826B CN104049826B CN201410295246.6A CN201410295246A CN104049826B CN 104049826 B CN104049826 B CN 104049826B CN 201410295246 A CN201410295246 A CN 201410295246A CN 104049826 B CN104049826 B CN 104049826B
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Abstract
The invention relates to a carbon nanotube capacitive touch screen and a manufacturing method thereof, the structure of the carbon nanotube capacitive touch screen comprises a cover plate layer, an OCA optical adhesive layer and a carbon nanotube transparent conductive film layer, a circuit layer is arranged on the lower surface of the carbon nanotube transparent conductive film layer, an electrode layer is arranged around the circuit layer, the electrode layer is used to lead out the circuit layer, when working, a low voltage AC electric field is formed in the carbon nanotube transparent conductive film layer, when a user touches the surface of the carbon nanotube capacitive touch screen with a finger, a coupling capacitor is formed between the finger and the carbon nanotube transparent conductive film layer, and a certain amount of charges are transferred to a human body, in order to recover the charge loss, the charge is replenished from the four corners of the carbon nanotube capacitive touch screen, and the amount of the replenished charge in each direction is proportional to the distance between the touch points, so that 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 composition for CNT
The structure and processing technology of formulation.
Background technology
It is well known that CNT is the seamless hollow tubular structure crimped by CNT lamella.With excellent
Electric property, high intensity and pliability, stable chemical property and there is no obvious characteristic suction to visible ray and near infrared light
The characteristics such as receipts, are a kind of super flexible " transparent " conductors by its film constituted.In addition, the film also has, cost is low, environment
Friendly, resourceful advantage.Current result of study, which is proved carbon nanotube film, to be had and can be led with comparable transparent of ITO
Electrically, also it is considered as most to be hopeful one of substitution resource shortage, fragility ITO, the material as nesa coating of new generation, no
Growing demand of the industries such as touch-screen, display, solar cell to nesa coating can be only met, and to promoting
The development of flexible device of new generation has 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
Direct formation of film at surface during CVD growth, is then transferred on transparent base and forms transparent conductive film；It can also be evenly dispersed into
Dispersion liquid is formed in a certain solvent, then by the dispersion liquid using filtering transfer method, lifting dip coating, spraying process, spin-coating method, electricity
The techniques such as swimming sedimentation, layer assembly method are deposited into film on a transparent substrate.In addition, these CNTs can also be with nanometer
Carbon pipe or conducting polymer etc. are compound to be made transparent conductive film.Typically carried out when specific implementation by such a way
Manufacture.
Production method one：
Transparency electrode is used as using single-walled carbon nanotube transparent conductive film.Film light transmittance is between 80 ~ 90%, surface
Resistance is in 70 ~ 200 ohm.sq-1Between.
Production method two：
Transparency electrode is used as using double-walled carbon nano-tube transparent conductive film.Film light transmittance is between 85 ~ 90%, surface
Resistance is in 50 ~ 150 ohm.sq-1Between.
Production method three：
Transparency electrode is used as using multi-walled carbon nanotube transparent conductive film.Film light transmittance is between 85 ~ 90%, surface
Resistance is in 250 ~ 300 ohm.sq-1Between.
Production method four：
Using single-walled carbon nanotube and poly- 3,4-ethylene dioxythiophene/poly styrene sulfonate（PEDOT:PSS）Compound
Transparent conductive film is used as transparency electrode.Film light transmittance is between 80 ~ 90%, and sheet resistance is in 100 ~ 300 ohm.sq-1It
Between.
Production method five：
Transparency electrode is used as using single-walled carbon nanotube and two layers of compound transparent conductive film of CNT.Film printing opacity
Rate is between 85 ~ 90%, and sheet resistance is in 180 ~ 250 ohm.sq-1Between.
As constantly advancing for modern multimedia information technology, and amusement, query facility are continuously increased, touch
The application of screen is more and more extensive.And capacitive touch screen only needs to touch, signal can be just produced without pressure, in production
After only need to the relatively low, capacitive technologies once or completely without screen calibration, in light loss and system power dissipation it is wear-resistant,
Long lifespan, maintenance cost low plurality of advantages when user uses.And CNT is as one kind in new material, it is making
It is same in terms of touch-screen that there is the advantage that can not be substituted.Following CNT is compared with existing ITO conductive materials,
CNT has excellent electric property, high intensity and pliability, stable chemical property and to visible ray and near-infrared
The light characteristic such as do not have obvious characteristic to absorb, also with cost is low, environment-friendly, resourceful advantage, these advantages are all by table
Bright CNT also turns into a kind of new material substituted in tradition ITO conductive materials at last.
What is generally used at present is transparent conductive film material the disadvantage is that, the film of outer layer easily scratches and stabs and cause
Touch screen function is not normal；ITO conductive layer is easily changed its characteristic by the change of external condition, and CNT is super as one kind
Flexible " transparent " conductor, can overcome the shortcoming of traditional material.
The content of the invention
The invention provides a kind of CNT capacitive touch screen and preparation method thereof, it utilizes nano carbon tube material system
CNT capacitive touch screen is made, compared with traditional material, it is easier to observation and inspection, using Petting Area CNT
Plus periphery cabling silver paste is as wire, the impedance of passage can be reduced, effect is touched more preferably, and this is for the main of the present invention
Purpose.
The technical solution used in the present invention is：A kind of CNT capacitive touch screen, including cover layer, OCA optics
Glue-line and CNT transparent conductive film layer, wherein, the OCA optical cement layers are arranged on the cover layer and the CNT is saturating
Between bright conductive membrane layer, the cover layer is made up of PC materials, is also set on the CNT transparent conductive film layer lower surface
Line layer is equipped with, the line layer surrounding is provided with electrode layer, the electrode layer is formed by the printing of silver paste material, and the electrode layer is used to
The line layer is drawn, during work, in the CNT transparent conductive film layer formed a low-voltage AC electric field, when with
When family finger touches the CNT capacitance touch screen surfaces, it can be formed between finger and the CNT transparent conductive film layer
One coupled capacitor, has a certain amount of electric charge transfer to human body this moment, in order to which recovery charge loses, and electric charge is from the CNT
The corner of capacitive touch screen, which is supplemented in, to be come, and the quantity of electric charge of all directions supplement and the distance of touch point are proportional, thus, it is possible to push away
Calculate the position of touch point.
A kind of preparation method of CNT capacitive touch screen, comprises the following steps：
The first step：Cutting blanking is carried out to CNT transparent conductive film, CNT transparent conductive film is cut
Into the size needed for typesetting.
Second step：Shrink aging is carried out to the CNT transparent conductive film cut in the first step, will be through undue
CNT transparent conductive film after cutting is fixed on glass with High temperature-resistanadhesive adhesive tape, and the temperature in case to be baked reaches 80 degree
When, promote baking box to carry out high temperature shrink aging CNT transparent conductive film, baking temperature is controlled at 135 degree, baking
Time control was at 50 minutes, after baking is finished, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, when receiving
Rice carbon pipe transparent conductive film surface temperature is less than after 80 degree, just takes out CNT transparent conductive film from baking box,
After completing to the shrink aging of CNT transparent conductive film, each piece of CNT transparent conductive film is measured
The work of sheet resistance, measures four angles of each piece of CNT transparent conductive film and 5 sheet resistance values in centre position, resistance
Fluctuation range is certified products within positive and negative 50 Ω.
3rd step：The CNT transparent conductive film that shrink aging is completed in second step is cleaned with air pressure gun,
Black ink target is republished, printing baking temperature continues 10 minutes in the case of 70 degree, after the completion of printing baking, nanometer
After carbon pipe transparent conductive film cools 5 ~ 10 minutes in baking box, when CNT transparent conductive film surface temperature is less than 50 degree
Afterwards, just CNT transparent conductive film is taken out from baking box.
4th step：Unwanted CNT current-carrying part is removed using the principle of laser-induced thermal etching, will have been printed in the 3rd step
The CNT transparent conductive film of good black target is put on laser-induced thermal etching platform, opens air draught, to inhale flat material, is imported
Weave after procedure, laser etching machine first catches the target of every mould to position, then the CNT of every mould is lost
Carve, unwanted current-carrying part is fallen in laser-induced thermal etching, while the Etching of touch-screen active region is come out, after the completion of laser-induced thermal etching
Get to whether 200M Ω measurement etching areas have impedance using universal meter, no resistance explanation has been etched totally, then is surveyed with universal meter
Two half adjacent triangular patterns of amount have no resistance, and no resistance illustrates interchannel without short circuit, and function is normal.
5th step：Printing silver paste is carried out to completing the CNT transparent conductive film after laser-induced thermal etching in the 4th step,
Silver paste is printed on the both sides and upside of CNT transparent conductive film, during printing silver paste is carried out, baking temperature
Control is toasted 40 minutes at 130 degree, when case temperature to be baked reaches 80 degree, the CNT electrically conducting transparent for being printed with silver paste is thin
Film promotes baking box to be toasted, after the completion of baking, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box,
After CNT transparent conductive film surface temperature is less than 80 degree, just CNT transparent conductive film is taken from baking box
Go out, the printing silver paste of this step is the reduction channel impedance in order to which the circuit inside touch-screen active region is extracted by silver paste,
Subsequent handling is bound together with FPC again, carries out hundred lattice tests after the completion of silver paste baking, multiple tracks 45 is drawn on silver paste with blade
The oblique line at angle is spent, 45 degree of lines grid is combined into, then is bonded at 3M810 tests adhesive tape above grid, after being firmly bulldozed, then with
The silver paste that 45 degree of angles are at the uniform velocity torn up in test tape, lattice is not fallen off, that is, illustrates that adhesive force of the silver paste on CNT is qualified
, get to 20K Ω with universal meter, measure the impedance of single line channel, as channel impedance≤20K Ω, the ring ground Ω of resistance≤200
When be certified products.
6th step：The CNT transparent conductive film of silver paste out of the press in 5th step is subjected to laser circuit profile
Work, first on laser machine platform place glassine paper simultaneously fixed with double faced adhesive tape, first with the radium-shine contraposition of 3.8 ~ 5.0W low-power
Line and circuit profile, then, open air draught, then CNT transparent conductive film is placed, and alignment is carried out again to bit line
The work of laser profile.
7th step：The CNT transparent conductive film of radium-shine good required circuit profile in 6th step is tied up with FPC
It is fixed, first, ACF is covered at FPC pressing golden fingers, ACF must be covered at the windowing of FPC copper foils between two parties, then that FPC is pre-
The position of lifting one's head of circuit is pressed in, then carries out localization tool, flatness and the position of thermal head are adjusted, finally by pulse hot press
Pressed, after the completion of hot pressing, the sealing on the junction point of FPC and circuit, for fixing FPC.
8th step：FPC CNT transparent conductive film will be bound in 7th step, be connected to by SIU development boards
Computer, then go the data for detecting each passage whether normal by developing software into engineering debugging mode, then carry out line survey
Examination, sees whether lines show normally.
9th step：PC cover plate materials are made, first, the diaphragm of PC printing surfaces are torn, in its printing surface process black oil
Ink, touch viewing area and key icon required for producing, 10 minutes duration of 70 degree of baking temperature.
Tenth step：Many one layer of black inks are printed on PC cover plates in the 9th step, its purpose is to increase ink to hide
Photosensitiveness and fill up some small pin holes, 30 minutes duration of 70 degree of baking temperature, after having toasted by hundred lattice of the 5th step test into
Row test ink adhesive force is qualified with the ink adhesion for ensuring printed.
11st step：Optical clear glue-line is made, size is held successfully with blanking machine according to typesetting design, blanking machine air pressure reaches volume
Determine to be operated in the case of operating pressure 5bar ± 1, tension force is in the range of 0.7 ~ 0.85N, by OCA layer laser
Radium-shine method fluting borehole, FPC binding position and shooting head bore position are empty out, to reduce difference in height and increase printing opacity
Rate, when progress OCA is radium-shine, it is easily release face-down, opens air draught, OCA is put in board centre position, radium-shine complete
Heel row removes waste material, and is cleaned.
12nd step：The PC cover plates that the radium-shine good OCA layers of 11st step and the tenth step are printed carry out putting up conjunction greatly, people
Work to being fitted behind good position with laminating machine, during laminating control laminating speed 20 ~ 25m/min, pressure 0.1 ~
0.2kg, laminating process will control cleanliness factor, in order to avoid cause cosmetic damage.
13rd step：The work that the PC cover plates got togather cut profile and dig listening bore is puted up to big in the 12nd step.
14th step：13rd step is cut the PC cover plates of profile and the 8th step qualified CNT is transparent after tested and is led
Conductive film carries out small pieces laminating with chip mounter, first radium-shine good localization tool before laminating a, it is ensured that air draught on aligning accuracy, chip mounter
First put the PC for putting the 13rd step on the 8th step qualified CNT transparent conductive film after tested, another air-suction table well on platform well
Cover plate, tears the mould release membrance on OCA layers, is then fitted, laminating parameter setting atmospheric pressure value 0.45Bar, pace
1000mm/s, return speed 200mm/s, flip-flop transition 10*100ms.
15th step：The product that 14th step is posted carries out deaeration, will insert in electrostatic box, and deliver to per flake products
De-bubble in deaeration machine, sets 40 degree of deaeration machine temperature, air pressure 5kg, 40 minutes time, checks steam bubble either with or without going completely after de-bubble
Remove and CNT conductive layer is either with or without layering.
16th step：The CNT product steeped to being removed in the 15th step carries out outward appearance wiping and inspection, wipes dirty
And stain, check outward appearance whether there is scratches, stabs, bad, the outward appearance non-defective unit such as the acute tooth of ink penetration, steam bubble, debris, stain, white point
Function detection is carried out again, by the method for testing of the 8th step, computer is connected to by SIU development boards, then go inspection by developing software
Whether the data for surveying each passage are normal, and carry out line test, see that lines are displayed whether normally.
17th step：Complete CNT capacitive touch screen to be attached in mobile phone complete machine again after the 16th step to see reality
Using effect, and the optimization of IC configuration parameters is carried out, the IC configuration parameters of a suitable CNT are debugged again, make complete machine
Effect is more perfect, when user's finger touches the touch screen surface with CNT, finger and CNT conductor interlayer
A coupled capacitor can be formed, a certain amount of electric charge transfer is just had to human body, in order to recover these loss of charge, electric charge is from screen
The corner of curtain, which is supplemented in, to be come, and the quantity of electric charge of all directions supplement and the distance of touch point are proportional, and thus touch-control IC can be extrapolated
The position of touch point, CNT capacitive touch screen touch sensitivity is high, more smooth, Consumer's Experience sense of ruling is stronger.
Beneficial effects of the present invention are：Transparent conductive film with CNT is processed by the method for laser-induced thermal etching
Go out circuit pack, paste one layer of OCA by binding FPC by the connection of the inside to mainboard end, then on CNT surface, most
Cover plate is covered in above nano carbon tube material afterwards, a piece of capacitive touch screen is combined into.The touch-screen is by touch-control IC and complete machine
Mainboard controls to realize touch function.CNT capacitive touch screen is arranged on above display screen, for detecting the position touched
Put, when capacitance plate is touched, the position coordinates of contact just parsed by touch-control IC, processor obtains the initial data touched,
Interference is removed, pressure spot is calculated, sets up touch area, calculate accurate coordinates.
Present invention employs novel conductive material " CNT ".Have for it excellent electric property, high intensity and
Pliability, stable chemical property and the characteristic such as do not have obvious characteristic to absorb to visible ray and near infrared light, are lost using laser
Periphery silver paste makes circuit pack to the method at quarter using the technique of silk-screen printing simultaneously.With high transmission rate, stability is high, make
Make environmental protection, touch the features such as accurate, Consumer's Experience sense is strong.
The technology of the present invention is mainly directed towards the new material of touch-screen industry and the importing of manufacture craft, and it can provide height
The CNT capacitive touch screen of stability, can also experience CNT capacitive touch screen better than existing frequently-used
Some aspects of ITO touch-screens：1st, CNT capacitive touch screen of the invention employs CNT as main composition
Material, compared with traditional ITO touch-screens, cost is substantially reduced, in the case where indium tin is fewer and fewer, certainly will have novel-section
Expect to substitute traditional ITO.2nd, CNT capacitive touch screen of the invention employs CNT as main composition material
Material, with very high light transmittance.The image so shown by touch-screen can be more true to nature, and color also can be truer.3、
The CNT capacitive touch screen of the present invention employs CNT as main composition material, because CNT is with very high
Deflection degree, be so considerably reduced as ITO materials because bending excessively and caused by dysfunction situation.
Brief description of the drawings
Fig. 1 is railway superstructures schematic diagram of the invention.
Fig. 2 is layer structure schematic diagram of the invention.
Fig. 3 is overall structure diagram of the invention.
Fig. 4 schemes for the overall composition of the present invention.
Fig. 5 is present invention detection CNT sheet resistance value schematic diagram.
Fig. 6 is laser-induced thermal etching CNT area schematic of the present invention.
Fig. 7 is that screen printed electrode of the present invention layer overlaps schematic diagram with CNT.
Fig. 8 is CNT circuit appearance schematic diagram of the present invention.
Fig. 9 is the conspectus after present invention binding FPC.
Figure 10 is FPC tensile tests (vertical direction) schematic diagram of the present invention.
Figure 11 is FPC tensile tests (horizontal direction) schematic diagram of the present invention.
Figure 12 is cover plate silk-screen schematic diagram of the present invention.
Figure 13 is schematic diagram after cover plate of the present invention is fitted with OCA layers.
Figure 14 is schematic diagram after cover plate of the present invention is fitted with circuit.
Embodiment
As shown in Fig. 1 to 14, a kind of CNT capacitive touch screen 100, it includes cover layer 10, OCA optical cement layers
20 and CNT transparent conductive film layer 30, wherein, the OCA optical cement layers 20 are arranged on the cover layer 10 and the nano-sized carbon
Between pipe transparent conductive film layer 30, the cover layer 10 is made up of PC materials.
Line layer 40 is additionally provided with the lower surface of CNT transparent conductive film layer 30.
The surrounding of line layer 40 is provided with electrode layer 50, the electrode layer 50 is formed by the printing of silver paste material, the electrode layer
50 the line layer 40 to be drawn.
During work, a low-voltage AC electric field is formed in the CNT transparent conductive film layer 30, when user's hand
When referring to the touch CNT capacitance touch screen surfaces, one can be formed between finger and the CNT transparent conductive film layer 30
Individual coupled capacitor, has a certain amount of electric charge transfer to human body, in order to which recovery charge loses, electric charge is electric from the CNT this moment
The corner of appearance formula touch-screen, which is supplemented in, to be come, and the quantity of electric charge of all directions supplement and the distance of touch point are proportional, thus, it is possible to calculate
Go out the position of touch point.
When specific implementation, the electrode layer 50 and supports 1.8V ~ 3.3V interfaces by 2.8V ~ 3.3V power voltage supply
Level.
The base material 31 of the CNT transparent conductive film layer 30 is by PET (polyethylene terephthalate), PC (poly- carbon
Acid esters), PMMA (polymethyl methacrylate), any one of glass is made.
The thickness of the base material 31 of the CNT transparent conductive film layer 30 is 0.125mm, 0.175mm, 0.188mm；
0.38mm、0.5mm、0.65mm；0.5mm、0.65mm；Any one of 0.55mm, 0.7mm, 1.1mm thickness.
The light transmittance of the CNT transparent conductive film layer 30 is 80 ~ 97.7%, and sheet resistance value is 30 ~ 400 Ω, specific
The number of plies difference of the CNT transparent conductive film layer 30 can be divided into single wall, double-walled and many wall nano-sized carbons when implementation
Pipe.
When specific implementation, the CNT capacitive touch screen of the invention supports standard I2C communication interfaces.
As shown in Fig. 1 to 14, a kind of preparation method of CNT capacitive touch screen, it comprises the following steps：
The first step：Cutting blanking is carried out to CNT transparent conductive film.
The size that CNT transparent conductive film is cut into needed for typesetting, should be noted that during cutting
Problem, one is that typesetting utilization rate is maximized, and two be that the size of cutting is uniformly conducive to the processing and manufacturing of back segment process, it is ensured that is made
Precision, reduces the registering error of silk-screen printing.
The air pressure of blanking machine is cut during cutting needs the operating pressure reached to be 5bar ± 1, cuts blanking machine
Tension force in the range of 0.65 ~ 0.75N.
It is that blanking is cut using blanking machine or laser machine blanking is used when specific implementation, can be according to next
Web is wide to be determined.Purpose is to ensure that the uniqueness of size.
Laser power is 20.8W, speed 15mm/s, PPI 400, DPI if laser machine blanking is used
1000。
Second step：Shrink aging is carried out to the CNT transparent conductive film cut in the first step.
CNT transparent conductive film after cutting is fixed on glass with High temperature-resistanadhesive adhesive tape, in case to be baked
Temperature when reaching 80 degree, promote baking box to carry out high temperature shrink aging, baking temperature control CNT transparent conductive film
System is at 135 degree, and baking time was controlled at 50 minutes.
After baking is finished, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, when CNT is transparent
Conductive film surface temperature is less than after 80 degree, and just CNT transparent conductive film is taken out from baking box, passes through this cooling
Mode ensure that its flatness, while ensuring to have undesirable effect it during the processing of back segment process, such as size distortion, side
Genesis is stuck up, resistance is fluctuated.
As shown in figure 5, after the shrink aging to CNT transparent conductive film is completed, to each piece of CNT
Transparent conductive film measures the work of sheet resistance, measures four angles and the interposition of each piece of CNT transparent conductive film
The 5 sheet resistance values put（1 in Fig. 5,2,3,4,5 points of positions）, resistance fluctuation range is certified products within positive and negative 50 Ω.
3rd step：The CNT transparent conductive film that shrink aging is completed in second step is cleaned with air pressure gun,
Black ink target is republished, during printing, silk-screen half tone is 350 mesh, the μ of black ink half tone thickness 8 ~ 10, black
21 ~ 25N of ink half tone tension force, 22.5 degree of grenadine angle, printing baking temperature continue 10 minutes in the case of 70 degree.
Printing is using 80 degree of scraper, 15 ~ 20 degree of scraper angle, 0 ~ 15 degree of scraper gradient, 2 ~ 3kg of scraper pressure, scraper
3 ~ 8m/min of speed, from version height 3 ~ 4mm.
After the completion of printing baking, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, work as nano-sized carbon
Pipe transparent conductive film surface temperature is less than after 50 degree, just takes out CNT transparent conductive film from baking box.
Substitute silver paste with black ink, one can reduce cost because silver paste printing ink is more expensive than black ink, two be because
Black target is easier to catch by the CCD camera lenses of laser equipment, and laser-induced thermal etching precision is high.
4th step：Unwanted CNT current-carrying part is removed using the principle of laser-induced thermal etching.
Characteristic according to CNT can remove unwanted CNT current-carrying part using the principle of laser-induced thermal etching,
So as to instead of traditional soda acid etching, ITO pattern is either made using acid-proof ink or using etching paste, and laser loses
Scribe that journey is more environmentally friendly, equipment simpler, auxiliary material is more saved, process simpler, more convenient operation.
As shown in fig. 6, the CNT transparent conductive film of black target out of the press in the 3rd step is put into laser-induced thermal etching
On platform, air draught is opened, to inhale flat material, importing has been woven after procedure, and laser machine first catches the target of every mould to determine
Position, is then etched, unwanted current-carrying part is fallen in laser-induced thermal etching to the CNT of every mould, while by touch-screen active region
Etching come out（Blank space is the CNT current-carrying part 61 to be remained in Fig. 6, and filling part is divided into laser-induced thermal etching
The part 62 fallen）.
During laser-induced thermal etching, laser parameter setting waveform 3, power 65W, speed 2000mm/s, frequency 250kHZ,
A sky 400us, the 400us that writes rapidly, the 30us that transfers, open the us of laser -30, close laser 200us, engraving number of times twice.
Get to whether 200M Ω measurement etching areas have impedance using universal meter after the completion of laser-induced thermal etching, no resistance explanation is
Etching is clean, then has no resistance with two half adjacent triangular patterns of universal meter measurement, and no resistance illustrates that interchannel is not short
Road, function is normal.
5th step：As shown in fig. 7, being carried out to completing the CNT transparent conductive film after laser-induced thermal etching in the 4th step
Silver paste is printed, silver paste 71 is printed on the both sides and upside of CNT transparent conductive film.
During printing silver paste is carried out, the mesh of silk-screen half tone 350, the μ of silver paste half tone thickness 8 ~ 10, the μ of line footpath 27, silver paste net
21 ~ 25N of version tension force, 30 degree of grenadine angle, baking temperature control are toasted 40 minutes at 130 degree.
As shown in fig. 7, during printing silver paste is carried out, it is oblique using 80 degree of scrapers, 20 ~ 25 degree of scraper angle, scraper
Degree 0 ~ 15 degree, 2 ~ 3kg of scraper pressure, 2 ~ 5m/min of scraper speed, from version highly 3 ~ 4mm, when case temperature to be baked reaches 80 degree,
Baking box is promoted to be toasted the CNT transparent conductive film for being printed with silver paste.
After the completion of baking, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, when CNT is saturating
Bright conductive film surface temperature is less than after 80 degree, just takes out CNT transparent conductive film from baking box.
The printing silver paste of this step is the reduction passage in order to which the circuit inside touch-screen active region is extracted by silver paste
Impedance, subsequent handling is bound together with FPC again.
Hundred lattice tests are carried out after the completion of silver paste baking, the oblique line at 45 degree of angles of multiple tracks is drawn on silver paste with blade, is combined into
45 degree of lines grid, then be bonded at 3M810 tests adhesive tape above grid, after being firmly bulldozed, then with 45 degree of angles at the uniform velocity tear up survey
The silver paste tried in adhesive tape, lattice is not fallen off, that is, illustrates that adhesive force of the silver paste on CNT is qualified.
Get to 20K Ω with universal meter, measure the impedance of single line channel, as channel impedance≤20K Ω, ring resistance≤
It is certified products when 200 Ω.
6th step：As shown in figure 8, the CNT transparent conductive film of silver paste out of the press in the 5th step is carried out into laser radium
The work of ray road profile.
Glassine paper is first placed on laser machine platform and is fixed with double faced adhesive tape, first with the radium-shine contraposition of 3.8 ~ 5.0W low-power
Line and circuit profile, then, open air draught, then CNT transparent conductive film is placed, and alignment is carried out again to bit line
The work of laser profile.
Carry out laser profile work when, laser power be 20.8W, speed 15mm/s, PPI 400,
DPI 1000.Ensure that circuit profile there can not be yellow side and smooth.
7th step：The CNT transparent conductive film of radium-shine good required circuit profile in 6th step is tied up with FPC
It is fixed.
First, the ACF that 18 μ are thick, 1.2mm is wide is covered at FPC pressing golden fingers, ACF must be covered in FPC copper foils between two parties
Windowing at.
Then by FPC precompressed in the position of lifting one's head of circuit, then localization tool is carried out, adjust flatness and the position of thermal head
Put, pressed finally by pulse hot press.
Pulse hot press parameter list is：
| Starting temperature Degree | Release temperature Degree | One section of temperature Degree | Two sections of temperature Degree | During heating Between 1 | During heating Between 2 | When holding temperature Between 1 | When holding temperature Between 2 | Air pressure Value 1 | Air pressure Value 2 |
| 100 degree | 100 degree | 160 degree | 165 degree | 1 second | 1 second | 2 seconds | 10 seconds | 0.7Pa | 1 Pa |
After the completion of hot pressing, the sealing on the junction point of FPC and circuit, for fixing FPC（See Fig. 9）.
Pulling force is tested with FPC tension testers：It is not peelable that vertical 90 ° of directions apply 500 gram forces（See Figure 10）；Level
It is not peelable that 180 ° of directions apply 1000 gram forces（See Figure 11）For certified products.
8th step：FPC CNT transparent conductive film will be bound in 7th step, be connected to by SIU development boards
Computer, then go the data for detecting each passage whether normal by developing software into engineering debugging mode.
Line test is carried out again, sees whether lines show normally.
Can typically draw " mouth " it is square, then draw " X " to detect the quality of circuit.
9th step：Makrolon, English name Polycarbonate, abbreviation PC, the present invention is used as cover plate material using PC
Material.
As shown in figure 12, PC cover plate materials are made, first, the diaphragm of PC printing surfaces are torn, print black in its printing surface
Color ink 84, touch viewing area 81, key icon 82 required for producing, camera form 83.
During process black ink, the mesh of silk-screen half tone 350, the μ of half tone thickness 8 ~ 10,21 ~ 25N of half tone tension force, net
45 degree of yarn angle, 70 degree of baking temperature continues 10 minutes.
Printing is using 80 degree of scrapers, 15 ~ 20 degree of scraper angle, 0 ~ 15 degree of scraper gradient, 2 ~ 3kg of scraper pressure, scraper speed
Spend 3 ~ 8m/min, from 3 ~ 4mm of version height.
Tenth step：Many one layer of black inks are printed on PC cover plates in the 9th step, its purpose is to increase ink to hide
Photosensitiveness and fill up some small pin holes.
During printing, the mesh of silk-screen half tone 350, the μ of half tone thickness 8 ~ 10,21 ~ 25N of half tone tension force, grenadine angle 45
Degree, 30 minutes duration of 70 degree of baking temperature.
Printing is using 80 degree of scrapers, 15 ~ 20 degree of scraper angle, 0 ~ 15 degree of scraper gradient, 2 ~ 3kg of scraper pressure, scraper speed
Spend 3 ~ 8m/min, from 3 ~ 4mm of version height.
Test ink adhesive force is carried out by the hundred lattice test of the 5th step after having toasted, to ensure printed ink adhesion
It is qualified.
11st step：Make optical clear glue-line.
OCA also known as Optical transparent adhesive, it holds size successfully with blanking machine according to typesetting design, and blanking machine air pressure reaches nominal operation
It can be operated in the case of pressure 5bar ± 1, tension force is in the range of 0.7 ~ 0.85.
Again by the method fluting borehole of the laser of OCA layers 20, FPC binding position and shooting head bore position are empty out
Come, to reduce difference in height and increase light transmittance.
Carry out OCA it is radium-shine when, it is easily release to open air draught down, and OCA is put in board centre position,
Laser power is 20W, speed 13mm/s, PPI 400, DPI 1000.Radium-shine complete heel row removes waste material, and is cleaned.
12nd step：The PC cover plates that the radium-shine good OCA layers of 11st step and the tenth step are printed carry out putting up conjunction greatly, people
Work behind good position with laminating machine to being fitted.
20 ~ 25m/min of control laminating speed, 0.1 ~ 0.2kg of pressure during laminating.Laminating process will be controlled clean
Cleanliness, in order to avoid cause cosmetic damage.
13rd step：The work that the PC cover plates got togather cut profile and dig listening bore is puted up to big in the 12nd step.
Carry out cutting profile using CNC numerical control machining centers when specific implementation and dig listening bore.
When specific works, positioning hole is accomplished fluently with puncher first, setting CNC cutting parameters feed speed 120%,
The speed of mainshaft 100%, tool selection Φ 1.0*0.65*90 degree, cut after profile and to examine whether size meets with slide calliper rule and Quadratic Finite Element
It is required that.Clean surface version surrounding and soft flocks, the dirt pits on surface（See Figure 13）.
14th step：13rd step is cut the PC cover plates of profile and the 8th step qualified CNT is transparent after tested and is led
Conductive film carries out small pieces laminating with chip mounter.
First radium-shine good localization tool before laminating, it is ensured that aligning accuracy.First put the 8th step warp on chip mounter on an air-suction table well
Put the PC cover plates of the 13rd step on the CNT transparent conductive film of test passes, another air-suction table well, tear on OCA layers
Mould release membrance, is then fitted.
Fit parameter setting atmospheric pressure value 0.45Bar, pace 1000mm/s, return speed 200mm/s, flip-flop transition
10*100ms (see Figure 14).
15th step：The product that 14th step is posted carries out deaeration.
It will be inserted per flake products in electrostatic box, and deliver to de-bubble in deaeration machine.Set 40 degree of deaeration machine temperature, air pressure 5kg,
40 minutes time.
Check steam bubble either with or without complete removal and CNT conductive layer either with or without layering after de-bubble.
Therefore the CNT conductive layer that invention is used is made up of double-walled, and in order to prevent it to be layered, deaeration temperature can not be too
Height, pressure can not be too strong, and the time can relative extension.
16th step：The CNT product steeped to being removed in the 15th step carries out outward appearance wiping and inspection.Wipe dirty
And stain, check outward appearance whether there is scratches, stabs, the acute tooth of ink penetration, steam bubble, debris, stain, white point etc. it is bad.Outward appearance non-defective unit
Function detection is carried out again.By the method for testing of the 8th step, computer is connected to by SIU development boards, then inspection is gone by developing software
Whether the data for surveying each passage are normal, and carry out line test, see that lines are displayed whether normally.
17th step：Complete CNT capacitive touch screen to be attached in mobile phone complete machine again after the 16th step to see reality
Using effect.And the optimization of IC configuration parameters is carried out, the IC configuration parameters of a suitable CNT are debugged again, make complete machine
Effect is more perfect.When user's finger touches the touch screen surface with CNT, finger and CNT conductor interlayer
A coupled capacitor can be formed, a certain amount of electric charge transfer is just had to human body.In order to recover these loss of charge, electric charge is from screen
The corner of curtain, which is supplemented in, to be come, and the quantity of electric charge of all directions supplement and the distance of touch point are proportional, and thus touch-control IC can be extrapolated
The position of touch point.CNT capacitive touch screen touch sensitivity is high, more smooth, Consumer's Experience sense of ruling is stronger.
Claims (1)
1. a kind of preparation method of CNT capacitive touch screen, it is characterised in that comprise the following steps：
The first step：Cutting blanking is carried out to CNT transparent conductive film, CNT transparent conductive film cut in a row
Size needed for version,
Second step：Shrink aging is carried out to the CNT transparent conductive film cut in the first step,
CNT transparent conductive film after cutting is fixed on glass with High temperature-resistanadhesive adhesive tape, the temperature in case to be baked
When degree reaches 80 degree, baking box is promoted to carry out high temperature shrink aging CNT transparent conductive film, baking temperature control exists
135 degree, baking time was controlled at 50 minutes,
After baking is finished, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, when CNT electrically conducting transparent
Film surface temperature is less than after 80 degree, just takes out CNT transparent conductive film from baking box,
After the shrink aging to CNT transparent conductive film is completed, each piece of CNT transparent conductive film is entered
The work of row measurement sheet resistance, measures four angles of each piece of CNT transparent conductive film and 5 sheet resistances in centre position
Value, resistance fluctuation range is certified products within positive and negative 50 Ω,
3rd step：The CNT transparent conductive film that shrink aging is completed in second step is cleaned with air pressure gun, then printed
Brush black ink target, the printing substitutes silver paste with black ink, and printing baking temperature continues 10 points in the case of 70 degree
Clock,
After the completion of printing baking, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, when CNT is saturating
Bright conductive film surface temperature is less than after 50 degree, just takes out CNT transparent conductive film from baking box,
4th step：Unwanted CNT current-carrying part is removed using the principle of laser-induced thermal etching,
The CNT transparent conductive film of black target out of the press in 3rd step is put on laser-induced thermal etching platform, opens and inhales
Wind, to inhale flat material, importing has been woven after procedure, and laser etching machine first catches the target of every mould to position, then right
CNT per mould is etched, and unwanted current-carrying part is fallen in laser-induced thermal etching, while the figure of touch-screen active region is lost
Carve and,
Get to whether 200M Ω measurement etching areas have impedance using universal meter after the completion of laser-induced thermal etching, no resistance explanation has been etched
Totally, then measuring two half adjacent triangular patterns with universal meter has no resistance, and no resistance illustrates interchannel without short circuit, work(
Can be normal,
5th step：Printing silver paste, silver paste are carried out to completing the CNT transparent conductive film after laser-induced thermal etching in the 4th step
The both sides and upside of CNT transparent conductive film are printed on,
During printing silver paste is carried out, baking temperature control is toasted 40 minutes at 130 degree,
When case temperature to be baked reaches 80 degree, baking box is promoted to be dried the CNT transparent conductive film for being printed with silver paste
It is roasting,
After the completion of baking, after CNT transparent conductive film cools 5 ~ 10 minutes in baking box, led when CNT is transparent
Film surface temperature is less than after 80 degree, just takes out CNT transparent conductive film from baking box,
The printing silver paste of this step is the reduction passage resistance in order to which the circuit inside touch-screen active region is extracted by silver paste
Anti-, subsequent handling is bound together with FPC again,
Hundred lattice tests are carried out after the completion of silver paste baking, the oblique line at 45 degree of angles of multiple tracks is drawn on silver paste with blade, is combined into 45 degree
Lines grid, then be bonded at test adhesive tape above grid, after being firmly bulldozed, then with 45 degree of angles at the uniform velocity tear up test tape, lattice
In silver paste do not fall off, that is, illustrate adhesive force of the silver paste on CNT base material be it is qualified,
Get to 20K Ω with universal meter, measure the impedance of single line channel, as channel impedance≤20K Ω, ring ground resistance≤200
It is certified products when Ω,
6th step：The CNT transparent conductive film of silver paste out of the press in 5th step is carried out to the work of laser circuit profile
Make,
First glassine paper is placed on laser machine platform simultaneously to be fixed with double faced adhesive tape, first with 3.8 ~ 5.0W low-power it is radium-shine to bit line and
Circuit profile, then, opens air draught, then CNT transparent conductive film is placed, and alignment carries out laser again to bit line
The work of radium-shine profile,
7th step：The CNT transparent conductive film of radium-shine good required circuit profile in 6th step is bound with FPC,
First, ACF is covered at FPC pressing golden fingers, ACF must be covered at the windowing of FPC copper foils between two parties,
Then by FPC precompressed in the position of lifting one's head of circuit, then localization tool is carried out, adjust flatness and the position of thermal head, most
Pressed afterwards by pulse hot press,
After the completion of hot pressing, the sealing on the junction point of FPC and circuit, for fixing FPC,
8th step：FPC CNT transparent conductive film will be bound in 7th step, computer is connected to by SIU development boards,
Go the data for detecting each passage whether normal by developing software into engineering debugging mode again,
Line test is carried out again, sees whether lines show normally,
9th step：PC cover plate materials are made, first, the diaphragm of PC printing surfaces are torn, in its printing surface process black ink, system
Touch viewing area and key icon required for making, 10 minutes duration of 70 degree of baking temperature,
Tenth step：Many one layer of black inks are printed on PC cover plates in the 9th step, its purpose is to increase ink light-proofness
And fill up some small pin holes, 30 minutes duration of 70 degree of baking temperature,
Test ink adhesive force is carried out by the hundred lattice test of the 5th step after having toasted, to ensure that printed ink adhesion is closed
Lattice,
11st step：Optical clear glue-line is made,
Size is held successfully with blanking machine according to typesetting design, and blanking machine air pressure can in the case of reaching nominal operation pressure 5bar ± 1
Be operated, tension force in the range of 0.7 ~ 0.85N,
By the method fluting borehole of OCA layer lasers, FPC binding position and shooting head bore position are empty out, to subtract
Few difference in height and increase light transmittance,
Carry out OCA it is radium-shine when, it is easily release to open air draught down, and OCA is put in board centre position, radium-shine
Complete heel row removes waste material, and is cleaned,
12nd step：The PC cover plates that the radium-shine good OCA layers of 11st step and the tenth step are printed carry out putting up conjunction greatly, artificial right
Fitted behind good position with laminating machine,
20 ~ 25m/min of control laminating speed, 0.1 ~ 0.2kg of pressure during laminating, laminating process will control cleaning
Degree, in order to avoid cosmetic damage is caused,
13rd step：The work that the PC cover plates got togather cut profile and dig listening bore is puted up to big in the 12nd step,
14th step：13rd step is cut into the PC cover plates of profile and the 8th step, and qualified CNT electrically conducting transparent is thin after tested
Film carries out small pieces laminating with chip mounter,
First radium-shine good localization tool before laminating, it is ensured that first put the 8th step well after tested on an air-suction table on aligning accuracy, chip mounter
Put the PC cover plates of the 13rd step on qualified CNT transparent conductive film, another air-suction table well, tear release on OCA layers
Film, is then fitted,
Fit parameter setting atmospheric pressure value 0.45Bar, pace 1000mm/s, return speed 200mm/s, flip-flop transition 10*
100ms,
15th step：The product that 14th step is posted carries out deaeration,
It will be inserted per flake products in electrostatic box, and deliver to de-bubble in deaeration machine,
40 degree of deaeration machine temperature, air pressure 5kg, 40 minutes time are set,
Check that steam bubble is removed and CNT conductive layer is either with or without layering either with or without complete after de-bubble,
16th step：The CNT product steeped to being removed in the 15th step carries out outward appearance wiping and inspection, wipes dirty and dirt
Point, check outward appearance whether there is scratches, stabs, the acute tooth of ink penetration, steam bubble, debris, stain, white point etc. it is bad, outward appearance non-defective unit enters again
Row Function detection, by the method for testing of the 8th step, is connected to computer, then go detection every by developing software by SIU development boards
Whether the data of individual passage are normal, and carry out line test, see that lines are displayed whether normally,
17th step：Complete CNT capacitive touch screen to be attached in mobile phone complete machine again after the 16th step to see actual use
Effect, and the optimization of IC configuration parameters is carried out, the IC configuration parameters of a suitable CNT are debugged again, make the effect of complete machine
More perfect, when user's finger touches the touch screen surface with CNT, finger can shape with CNT conductor interlayer
Into a coupled capacitor, a certain amount of electric charge transfer is just had to human body, and in order to recover these loss of charge, electric charge is from screen
Corner, which is supplemented in, to be come, and the quantity of electric charge of all directions supplement and the distance of touch point are proportional, and thus touch-control IC can extrapolate touch
The position of point, CNT capacitive touch screen touch sensitivity is high, more smooth, Consumer's Experience sense of ruling is stronger,
In 3rd step during printing, silk-screen half tone is 350 mesh, the μ of black ink half tone thickness 8 ~ 10, black ink half tone
22.5 degree of 21 ~ 25N of tension force, grenadine angle, printing using 80 degree scraper, 15 ~ 20 degree of scraper angle, 0 ~ 15 degree of scraper gradient,
2 ~ 3kg of scraper pressure, 3 ~ 8m/min of scraper speed, from version height 3 ~ 4mm,
In 5th step during printing silver paste is carried out, the mesh of silk-screen half tone 350, the μ of silver paste half tone thickness 8 ~ 10, the μ of line footpath 27, silver
Half tone tension force 21 ~ 25N, 30 degree of grenadine angle are starched, using 80 degree of scrapers, 20 ~ 25 degree of scraper angle, 0 ~ 15 degree of scraper gradient, is scraped
2 ~ 3kg of knife pressure, 2 ~ 5m/min of scraper speed, from version height 3 ~ 4mm,
In 4th step during laser-induced thermal etching, laser parameter setting waveform 3, power 65W, speed 2000mm/s, frequency
250kHZ, a sky 400us, the 400us that writes rapidly, the 30us that transfers, open the us of laser -30, close laser 200us, engraving number of times twice,
In 6th step when the work of laser profile is carried out, laser power is 20.8W, speed 15mm/s, PPI
400th, DPI 1000, it is ensured that circuit profile can not have yellow side and smooth,
In 11st step laser power be 20W, speed 13mm/s, PPI 400, DPI 1000,
ACF in 7th step is wide for 18 μ thickness, 1.2mm, and pulling force is tested with FPC tension testers：Vertical 90 ° of directions apply 500 grams
Power is not peelable, and it is certified products that 180 ° of directions of level, which apply 1000 gram forces not peelable,
In 9th step during process black ink, the mesh of silk-screen half tone 350, the μ of half tone thickness 8 ~ 10, half tone tension force 21 ~
45 degree of 25N, grenadine angle, 70 degree of baking temperature continues 10 minutes, and printing is using 80 degree of scrapers, 15 ~ 20 degree of scraper angle, scrapers
0 ~ 15 degree of gradient, 2 ~ 3kg of scraper pressure, 3 ~ 8m/min of scraper speed, from version height 3 ~ 4mm,
In tenth step during printing, the mesh of silk-screen half tone 350, the μ of half tone thickness 8 ~ 10,21 ~ 25N of half tone tension force, grenadine angle
45 degree of degree, printing is using 80 degree of scrapers, 15 ~ 20 degree of scraper angle, 0 ~ 15 degree of scraper gradient, 2 ~ 3kg of scraper pressure, scraper speeds
3 ~ 8m/min, from version height 3 ~ 4mm,
Carry out cutting profile using CNC numerical control machining centers in 13rd step and dig listening bore, accomplish fluently positioning hole with puncher first,
CNC cutting parameters feed speed 120%, the speed of mainshaft 100%, tool selection Φ 1.0*0.65*90 degree are set, cuts and is used after profile
Slide calliper rule and Quadratic Finite Element examine whether size meets the requirements, soft flocks, the dirt pits on clean surface version surrounding and surface.
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| CN110750171A (en) * | 2019-09-27 | 2020-02-04 | 盈天实业(深圳)有限公司 | Touch sensor, preparation method thereof and touch display screen |
| CN113703612B (en) * | 2021-08-30 | 2023-09-22 | 业成科技（成都）有限公司 | Touch button and touch device |
| 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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| CN102129336A (en) * | 2011-02-28 | 2011-07-20 | 中国科学院苏州纳米技术与纳米仿生研究所 | Capacitor touch pad based on carbon nanotube film |
| CN102823012A (en) * | 2010-03-04 | 2012-12-12 | 格尔德殿工业公司 | Electronic devices including transparent conductive coatings including carbon nanotubes and nanowire composites, and methods of making the same |
| CN103164101A (en) * | 2013-04-03 | 2013-06-19 | 格林精密部件（惠州）有限公司 | Capacitance touch screen based on grapheme sensors |
| CN103455230A (en) * | 2013-09-26 | 2013-12-18 | 无锡宇宁光电科技有限公司 | Grapheme conductive film applied capacitive screen and manufacturing method thereof |
| CN103777834A (en) * | 2014-01-27 | 2014-05-07 | 无锡力合光电传感技术有限公司 | Single-chip capacitor touch screen based on organic glass pane and preparation method of single-chip capacitor touch screen |
-
2014
- 2014-06-26 CN CN201410295246.6A patent/CN104049826B/en not_active Expired - Fee Related
- 2014-09-23 CN CN201420547736.6U patent/CN204087182U/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102823012A (en) * | 2010-03-04 | 2012-12-12 | 格尔德殿工业公司 | Electronic devices including transparent conductive coatings including carbon nanotubes and nanowire composites, and methods of making the same |
| CN102129336A (en) * | 2011-02-28 | 2011-07-20 | 中国科学院苏州纳米技术与纳米仿生研究所 | Capacitor touch pad based on carbon nanotube film |
| CN103164101A (en) * | 2013-04-03 | 2013-06-19 | 格林精密部件（惠州）有限公司 | Capacitance touch screen based on grapheme sensors |
| CN103455230A (en) * | 2013-09-26 | 2013-12-18 | 无锡宇宁光电科技有限公司 | Grapheme conductive film applied capacitive screen and manufacturing method thereof |
| CN103777834A (en) * | 2014-01-27 | 2014-05-07 | 无锡力合光电传感技术有限公司 | Single-chip capacitor touch screen based on organic glass pane and preparation method of single-chip capacitor touch screen |
Also Published As
| Publication number | Publication date |
|---|---|
| CN204087182U (en) | 2015-01-07 |
| CN104049826A (en) | 2014-09-17 |
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