A kind of flexible base board and the manufacture method of touch screenTechnical field
The present invention relates to touch screen technology field, particularly relate to the manufacturer of a kind of flexible base board and touch screenMethod.
Background technology
Touch screen is a kind of input equipment significantly improving man machine operation interface, have directly perceived, simply, advantage efficiently.Touch screen has been obtained for being widely applied in many electronic products, such as mobile phone, PDA, multimedia, public information inquiry systemSystem etc..As a example by GFF structure condenser type touch screen, its basic structure is emission layer, OCA, receiving layer, OCA and cover-plate glass；ItsMiddle emission layer and receiving layer are the nesa coating of patterning.Traditional CTP(OGS/TOL and GFF etc.) structure touch screenNesa coating is all to use ITO plated film, is made by modes such as laser ablation, silk screen printing, gold-tinted etchings.
But, universal along with curved surface and Flexible Displays product, ITO, due to the fragility of self, limits touch screen to softThe direction of propertyization development, uses different transparent electrode materials to become a popular problem to replace ITO.Wherein nano silver wireIn addition to there is the electric conductivity that silver is excellent, due to the dimensional effect of Nano grade, there is the light transmission of excellence, flexible resistance, becomeFor curved surface and the leading role of flexible screen.But, use nanometer silver as conducting membrane material at present, mainly made by gold-tinted etchingBecome, but gold-tinted etching have to use etching solution, and different conducting membrane material has higher requirement to etching solution, loses simultaneouslyCarve more difficult recovery after liquid uses and easily cause the wasting of resources and environmental pollution；And laser-induced thermal etching is relative to gold-tinted etching and screen printingFor brush, the most simple and environmentally-friendly, laser-induced thermal etching is mainly used in having on certain thickness substrate (about 50 μm and more than), rightPolymer film substrate in slimming makes nesa coating, especially laser etch process is proposed requirements at the higher level；At presentNot yet occur that the polymer film substrate being specifically designed for slimming produces the electrically conducting transparent of patterning by laser etch processThe method of film.
Summary of the invention
The technical problem to be solved there is provided the manufacture method of the flexible base board of a kind of touch screen, utilizesAnti-transfer techniques, shifts on macromolecule membrane completely by the nanometer silver pattern conductive film that laser etch process makes, it is to avoidDirect Laser etched pattern on macromolecule membrane base material, causes and damages substrate crack, affects the quality of touch screen and goodRate；Flexible base board has high adhesion, slimming, the characteristic of resistance to bending.
Present invention also offers the manufacture method of a kind of touch screen, use the technology that laser etch process and reversion move, realExisting high adhesion, slimming, the double-layer nanometer silver touch screen of resistance to bending make, for follow-up abnormity, curved surface or flexible productDevelopment provides bigger probability.
The technical problem to be solved is achieved by the following technical programs:
The manufacture method of a kind of flexible base board, comprises the following steps:
Step 1, solidifying to form a conducting film on the rigid substrate, the formation material of described conducting film is nano-silver thread and/or receivesRice Argent grain；
Step 2, described conducting film frame print conductive silver paste；
Step 3, conducting film and conductive silver paste are carried out pattern conductive film and the cabling that laser-induced thermal etching obtains presetting；
Step 4, it is positioned at above described first pattern conductive film on described rigid substrates, forms a macromolecule membrane；
Step 5, peel off described rigid substrates, obtain flexible base board.
Further, described high molecular film material is polyimides.
Further, the thickness of described macromolecule membrane is 2 ~ 10 μm.
Further, described conducting film conductor planes resistance is 50 ~ 80 Ω/, transmitance > 90%.
Further, the solidification temperature of described conducting film is 120 ~ 160 DEG C, and hardening time is 10 ~ 60min.
A kind of manufacture method of touch screen, including following operation:
A, make upper sensor by above-mentioned manufacture method, there is the first pattern conductive film；
B, make lower sensor by above-mentioned manufacture method, there is the second pattern conductive film；
C, fit relative with lower sensor for described upper sensor, bind wiring board, obtain touch screen.
Further, described upper sensor is fitted by adhesive-layer is relative with lower sensor, and described adhesive-layer is that OCA is solidState transparent optical cement, LOCA liquid clear optical cement or OCR optical clear resin.
Further, described adhesive-layer thickness is 20 ~ 75 μm.
Further, the pattern of described first pattern conductive film and the second pattern conductive film is identical or different.
There is advantages that
The manufacture method of flexible base board of the present invention is coated with one layer of nano-silver conductive material the most on the rigid substrate, and silk-screen silver is starched,By laser etch process, nanometer silver transparent conductive film and silver slurry are realized the making of pattern conductive film and cabling, at this baseBe coated with a floor height molecular material on plinth, after solidification, macromolecule membrane peeled off glass substrate, then the patterning nanometer silver madeConducting film is thus completely transferred on macromolecule membrane, obtains nanometer silver flexible base board；Laser etch process and reversion is used to moveTechnology, solve and directly use laser-induced thermal etching fabricating patterned nano-silver conductive film the most right on slimming macromolecule membraneMacromolecule membrane causes the problem of fracture damage, has filled up the skill of nano-silver conductive film laser-induced thermal etching on slimming macromolecule membraneArt is blank, realizes the making of the nanometer silver flexible base board of high adhesion, slimming, resistance to bending, for follow-up abnormity, curved surface simultaneouslyOr the development of flexible product provides bigger probability.
Figure of description
Fig. 1 is the structural representation of inventive touch screen.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be described in detail, and embodiment is only the preferred embodiment of the present invention,It it not limitation of the invention.
In prior art, laser-induced thermal etching is for gold-tinted etching and silk screen printing, the most simple and environmentally-friendly, and laserEtching is mainly used in having on certain thickness substrate, and the polymer film substrate for slimming makes nesa coating,Especially laser etch process is proposed requirements at the higher level；Not yet occur that the polymer film substrate being specifically designed for slimming leads at presentCross the method that laser etch process produces the nesa coating of patterning.
The manufacture method of flexible base board of the present invention is coated with one layer of nano-silver conductive material, silk-screen silver the most on the rigid substrateSlurry, realizes the making of pattern conductive film and cabling by laser etch process to nanometer silver transparent conductive film and silver slurry,Be coated with a floor height molecular material on the basis of this, after solidification, macromolecule membrane peeled off glass substrate, then the patterning made is receivedRice silver conductive film is thus completely transferred on macromolecule membrane, obtains nanometer silver flexible base board.Use laser etch process with anti-The technology of transfer, it is achieved high adhesion, slimming, the making of nanometer silver flexible base board of resistance to bending, for follow-up abnormity, curved surfaceOr the development of flexible product provides bigger probability.
Embodiment 1
Present embodiments providing the manufacture method of a kind of flexible base board, it comprises the following steps:
Step 1, solidifying to form a conducting film on the rigid substrate, the formation material of described conducting film is nano-silver thread and/or receivesRice Argent grain；
After solidification, described conducting film conductor planes resistance is preferably 50 ~ 80 Ω/, transmitance > 90%.The solidification of described conducting filmTemperature is 120 ~ 160 DEG C, and hardening time is 10 ~ 60min, it is preferable that solidification temperature is 150 DEG C, and hardening time is 30min.
Described rigid substrates is tempering or non-tempering substrate, and the present invention is preferably glass substrate.
Step 2, described conducting film frame print conductive silver paste；
Step 3, conducting film and conductive silver paste are carried out pattern conductive film and the cabling that laser-induced thermal etching obtains presetting simultaneously；
In etching process, different laser instrument, etching precision and parameter are different, can regulate according to practical situation.Preferably,In laser etching method of the present invention, the etching precision of laser instrument is ± 5 μm, and working region is 500*500mm, operating rateBeing 2500 ~ 3000 mm/s, the alternating voltage of work is 220V ± 10%, and operating frequency is 50HZ.
Step 4, it is positioned at above described first pattern conductive film on described rigid substrates, forms a macromolecule membrane；
The macromolecular material used is finer and close, insulation, the high temperature resistant and macromolecular material of acid and alkali-resistance, and the present invention is preferredFor polyimides, it is thinner than glass or PET；The macromolecule membrane thickness solidifying to form is preferably 2 ~ 10 μm.
Step 5, peel off described rigid substrates, obtain flexible base board.
Stripping process, can manually or machine particularly as follows: attach one layer of UV glue (thickness is about 100um) on macromolecule membraneDevice is peeled off from described rigid substrates has the first pattern conductive film and the macromolecule membrane of cabling, afterwards its conducting surface and viscose glueAfter laminating closes, exposure, the most peelable UV glue, obtain nanometer silver flexible base board.
Prepare it is noted that the step that printing conductive silver paste etching forms cabling also can be realized by other etching modes；Printing conductive silver paste also can carry out printing etching after obtaining flexible base board again and form cabling.
Flexible base board is carried out the test in terms of adhesion, resistance to bending.Adhesion aspect, existing flexible base board is mainly receivedThe rice silver film, is i.e. coated with one layer of nano-silver conductive material in PET base material, but need to cover one layer of over coat again, with protectionNano-silver layer does not comes off, because exposed nano-silver layer is easy to wiping；And the nano-silver conductive made by the mode of the present inventionFilm, nanometer silver is directly to penetrate in macromolecule (PI) film substrate, it is not necessary to protective layer also can obtain adhering well to power, hundred latticeTest adhesion reaches 5B grade.Resistance to bending aspect, contrasts the ITO film, and because of the fragility of ITO self, crooked process radius reaches 3mmTime, once bending resistance produces significant change；And the flexible base board crooked process radius of the present invention reaches 3mm, survey after 100,000 bendingsExamination resistance is without significant change.
The present embodiment uses the technology that laser etch process and reversion move, it is achieved high adhesion, slimming, the receiving of resistance to bendingThe making of rice silver flexible base board, develops the probability providing bigger for follow-up abnormity, curved surface or flexible product.
Embodiment 2
The invention provides the manufacture method of a kind of touch screen, it includes following operation:
A, make upper sensor by the manufacture method of embodiment 1, specifically include following steps:
Step A1, solidifying to form a conducting film on the rigid substrate, the formation material of described conducting film is nano-silver thread and/or receivesRice Argent grain.
After solidification, described conducting film conductor planes resistance is preferably 50 ~ 80 Ω/, transmitance > 90%.Described conducting filmSolidification temperature is 120 ~ 160 DEG C, and hardening time is 10 ~ 60min, it is preferable that solidification temperature is 150 DEG C, and hardening time is30min。
Described rigid substrates is tempering or non-tempering substrate, and the present invention is preferably glass substrate.
Step A2, described conducting film frame print conductive silver paste.
Step A3, simultaneously conducting film and conductive silver paste are carried out the first pattern conductive film that laser-induced thermal etching obtains presetting andCabling, this cabling electrically connects with described first pattern conductive film.
In etching process, different laser instrument, etching precision and parameter are different, can regulate according to practical situation.ExcellentSelection of land, in laser etching method of the present invention, the etching precision of laser instrument is ± 5 μm, and working region is 500*500mm, workBeing 2500 ~ 3000 mm/s as speed, the alternating voltage of work is 220V ± 10%, and operating frequency is 50HZ.
Step A4, it is positioned at above described first pattern conductive film on described rigid substrates, forms a macromolecule membrane.
The macromolecular material used is finer and close, insulation, high temperature resistant and the macromolecular material of acid and alkali-resistance, the present inventionBeing preferably polyimides, it is thinner than glass or PET；The macromolecule membrane thickness solidifying to form is preferably 2 ~ 10 μm.
Step A5, peel off described rigid substrates, obtain sensor.
Stripping process, can manually or machine particularly as follows: attach one layer of UV glue (thickness is about 100um) on macromolecule membraneDevice is peeled off from described rigid substrates has the first pattern conductive film and the macromolecule membrane of cabling, afterwards its conducting surface and viscose glueAfter laminating closes, exposure, the most peelable UV glue, obtain upper sensor.
B, make lower sensor by the manufacture method of embodiment 1, specifically include following steps:
Step B1, solidifying to form a conducting film on the rigid substrate, the formation material of described conducting film is nano-silver thread and/or receivesRice Argent grain.
After solidification, described conducting film conductor planes resistance is preferably 50 ~ 80 Ω/, transmitance > 90%.Described conducting filmSolidification temperature is 120 ~ 160 DEG C, and hardening time is 10 ~ 60min, it is preferable that solidification temperature is 150 DEG C, and hardening time is30min。
Described rigid substrates is tempering or non-tempering substrate, and the present invention is preferably glass substrate.
Step B2, described conducting film frame print conductive silver paste.
Step B3, conducting film and conductive silver paste are carried out the second pattern conductive film that laser-induced thermal etching obtains presetting and walksLine, this cabling electrically connects with described second pattern conductive film.
In etching process, different laser instrument, etching precision and parameter are different, can regulate according to practical situation.ExcellentSelection of land, in laser etching method of the present invention, the etching precision of laser instrument is ± 5 μm, and working region is 500*500mm, workBeing 2500 ~ 3000 mm/s as speed, the alternating voltage of work is 220V ± 10%, and operating frequency is 50HZ.
Step B4, it is positioned at above described second pattern conductive film on described rigid substrates, forms a macromolecule membrane.
The macromolecular material used is finer and close, insulation, high temperature resistant and the macromolecular material of acid and alkali-resistance, the present inventionBeing preferably polyimides, it is thinner than glass or PET；The macromolecule membrane thickness solidifying to form is preferably 2 ~ 10 μm.
Step B5, peel off described rigid substrates, obtain lower sensor.
Stripping process, can manually or machine particularly as follows: attach one layer of UV glue (thickness is about 100um) on macromolecule membraneDevice is peeled off from described rigid substrates has the second pattern conductive film and the macromolecule membrane of cabling, afterwards its conducting surface and viscose glueAfter laminating closes, exposure, the most peelable UV glue, obtain lower sensor.
C, binding operation, comprise the following steps:
Step C1, the nonconductive surface of described upper sensor is pasted towards the conducting surface of described lower sensor relatively by adhesive-layerClose, obtain thin film sensor；
Described adhesive-layer is OCA solid transparent optical cement, LOCA liquid clear optical cement or OCR optical clear resin.ThisBright preferably OCA solid transparent optical cement, thickness is preferably 20 ~ 75 μm.
Step C2, conducting resinl ACF is fitted in FPC flexible circuit board；
Step C3, finally wiring board is bound on thin film sensor, obtains touch screen.
It should be noted that the pattern of described first pattern conductive film and the second pattern conductive film can be identical or notWith.The pattern of described first pattern conductive film and the second pattern conductive film is not particularly limited, the most not by the present inventionBe the improvement of the present invention, fall within prior art, and those skilled in the art easily according to different touch screen structures forProperty design correspondence described first pattern conductive film and the pattern of the second pattern conductive film, e.g., described first patternChange the driving layer that conducting film can be mutual capacitance type touch screen；Described second pattern conductive film can be mutual capacitance type touch screenInductive layer；It is not described in detail in this.
Prepare it is noted that can fit with the cover sheet of pre-set dimension with shape before or after binding wiring board, shapeBecome touch screen.This cover sheet can be safety glass or the plastic cover plate that surface configuration has BM film, but is not limited to this, isOutermost protective layer in screen, when the surface of cover sheet (standard shape or abnormally-structured) in curved surface, due to thin filmSensor is flexible, therefore, it is possible to well fit with the cover sheet that surface is curved surface, is so not protected cover plateThe restriction of geomery.
This method uses the technology that laser etch process and reversion move, and solves and directly adopts on slimming macromolecule membraneThe problem that macromolecule membrane easily causes fracture damage with laser-induced thermal etching fabricating patterned nano-silver conductive film, has filled up slimChange the technological gap of nano-silver conductive film laser-induced thermal etching on macromolecule membrane, realize high adhesion, slimming, resistance to bending simultaneouslyDouble-layer nanometer silver touch screen makes, and follow-up abnormity, curved surface or flexible product is developed to the probability providing bigger.
Embodiment 3
As it is shown in figure 1, which show the structural representation of a kind of touch screen of the present invention, the manufacture by embodiment 2 of this touch screenMethod prepares.A kind of touch screen, the lower sensor including the laminating corresponding with described upper sensor of upper sensor is uploaded with describedSensor and the wiring board of lower sensor conducting；Wherein, described upper sensor includes macromolecule membrane, is formed at through laser-induced thermal etchingFirst pattern conductive film of described macromolecule membrane and the cabling electrically connected with this first pattern conductive film；Described lower sensingDevice include macromolecule membrane, through laser-induced thermal etching be formed at described macromolecule membrane the second pattern conductive film and with this secondThe cabling of pattern conductive film electrical connection.
Further, the formation material of described first pattern conductive film and the second pattern conductive film is nano-silver threadAnd/or nano-Ag particles.The pattern of described first pattern conductive film and the second pattern conductive film may be the same or different.SolidificationAfter, described conducting film conductor planes resistance is preferably 50 ~ 80 Ω/, transmitance > 90%.The solidification temperature of described conducting film is120 ~ 160 DEG C, hardening time is 10 ~ 60min, it is preferable that solidification temperature is 150 DEG C, and hardening time is 30min.
Further, described high molecular film material is preferably polyimides, and thickness range is 2 ~ 10 μm.
Further, described upper sensor is fitted by adhesive-layer is relative with lower sensor, and described adhesive-layer is that OCA is solidState transparent optical cement, LOCA liquid clear optical cement or OCR optical clear resin；Thickness range is 20 ~ 75 μm.
In etching process, different laser instrument, etching precision and parameter are different, can regulate according to practical situation.ExcellentSelection of land, in laser etching method of the present invention, the etching precision of laser instrument is ± 5 μm, and working region is 500*500mm, workBeing 2500 ~ 3000 mm/s as speed, the alternating voltage of work is 220V ± 10%, and operating frequency is 50HZ.
Prepare it is noted that can fit with the cover sheet of pre-set dimension with shape before or after binding wiring board, shapeBecome touch screen.This cover sheet can be safety glass or the plastic cover plate that surface configuration has BM film, but is not limited to this, isOutermost protective layer in screen, when the surface of cover sheet (standard shape or abnormally-structured) in curved surface, due to thin filmSensor is flexible, therefore, it is possible to well fit with the cover sheet that surface is curved surface, is so not protected cover plateThe restriction of geomery.
The technology that this touch screen moves by using laser etch process and reversion, it is achieved high adhesion, slimming, resistance to bendingDouble-layer nanometer silver touch screen make, solve and directly use laser-induced thermal etching fabricating patterned to receive on slimming macromolecule membraneMacromolecule membrane is easily caused the problem of fracture damage by rice silver conductive film, has filled up nanometer silver on slimming macromolecule membrane and has ledThe technological gap of electrolemma laser-induced thermal etching, this touch screen provides bigger for the development of follow-up abnormity, curved surface or flexible product simultaneouslyProbability.
Embodiment described above only have expressed embodiments of the present invention, and it describes more concrete and detailed, but can notTherefore the restriction to the scope of the claims of the present invention it is interpreted as, as long as using the skill that the form of equivalent or equivalent transformation is obtainedArt scheme, all should fall within the scope and spirit of the invention.