CN101661360B - Capacitive touch screen and manufacturing method thereof - Google Patents
Capacitive touch screen and manufacturing method thereof Download PDFInfo
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- CN101661360B CN101661360B CN2009101827881A CN200910182788A CN101661360B CN 101661360 B CN101661360 B CN 101661360B CN 2009101827881 A CN2009101827881 A CN 2009101827881A CN 200910182788 A CN200910182788 A CN 200910182788A CN 101661360 B CN101661360 B CN 101661360B
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Abstract
The invention provides a capacitive touch screen and a manufacturing method thereof, the capacitive touch screen comprises a transparent substrate, at least one transparent electrode conductive layer is arranged on the substrate, a metal wiring is arranged on each electrode of each transparent electrode conductive layer for leading out, and an insulating film layer is printed on the surface of each metal wiring. The capacitive touch screen has the beneficial effects that the manufacturing technology is simple, the cost is very low, the capacitive touch screen can effectively prevent the phenomena of voltage tilting and electric erosion, and the safety is very high.
Description
Technical field
The present invention relates to a kind of be used for man-machine between mutual input media, specifically, relate to a kind of capacitive touch screen.
Background technology
The capacitor induction type touch-screen is to utilize the induction by current of human body to carry out work.When finger touch was on metal level, because people's bulk electric field, user and touch screen surface formed with a coupling capacitor, and for high-frequency current, electric capacity is direct conductor, so finger siphons away a very little electric current from contact point.This electric current divides the electrode on from touch-screen four jiaos and flows out, and the electric current of these four electrodes of flowing through is directly proportional with the distance of pointing four jiaos, and controller passes through the accurate Calculation to these four current ratios, draws touch point position.
Existing capacitive touch screen normally is provided with one or more transparency electrode conductive layers as workplace on a transparent insulating layer.When being provided with a transparency electrode conductive layer, on a plane of transparent insulating layer, a transparency electrode conductive layer is set; When being provided with two transparency electrode conductive layers, can on two planes of transparent insulating layer, a transparency electrode conductive layer be set respectively, also two transparency electrode conductive layers that are not conducted each other can be set on a plane of transparent insulating layer.As shown in Figure 1, transparent insulating layer 1 is generally glass or glued membrane, and the transparency electrode conductive layer is made up of a plurality of electrodes 2, and the graphics shape of electrode 2 is designed to polygonal shapes such as rectangle, regular hexagon, rhombus more.The electrode that shows among Fig. 1 is the X electrode.Each electrode 2 all can have a wiring 3 to connect, and the other end of this wiring is a portion of terminal 4, is used to connect other electrical equipments.In order to reduce the cloth line resistance, metal is generally adopted in the wiring of prior art.Because used metal material, therefore might produce voltage ramp and galvanic corrosion phenomenon.
About producing the situation of voltage ramp: in order to detect the position of capacitive touch screen, drive for the sub-making alive of every butt with the mode of single scanning, give a wiring making alive occasion, because other wiring does not have making alive and can cause voltage ramp; In addition, the ground connection wiring is a ground connection, and the electricity volt is 0V, and other alive occasions that connect up often also the voltage ramp phenomenon can take place.
About the galvanic corrosion phenomenon: there is moisture content in wiring portion or because during the temperature variation dewfall, can adsorb the ionic substance (Na+) in the dust aloft of swimming, so moisture content turns to polar material.With this state, the wiring portion making alive owing to voltage ramp produces ionization tendency, becomes metallic ion by low metal, so moisture content turns to the polarity solvent, will make the metal line broken string, is the galvanic corrosion phenomenon, and this can cause touch-screen insufficiency.
In view of above-mentioned technical matters, the general method that adopts is evaporation one deck dielectric film (SiO on metal line
2Film etc.), owing to this step must just can be finished in vacuum tank, so the manufacturing process complexity, cost is also very high, and the organic membrane that evaporation goes out is not exquisite, and thickness also must be very thick.The another kind of method that prior art adopts (is commonly called as OCA) for a PET film that has sticker is pasted on the metal line, because sticker just adheres to the surface of glass, enter water vapor easily from PET film surface, the possibility that galvanic corrosion takes place in long security test is higher, so this method only is applicable to the occasion that security is lower.
Summary of the invention
The objective of the invention is to solve above-mentioned technical matters, provide a kind of manufacturing process the simple and very low capacitive touch screen of cost.
Purpose of the present invention is achieved through the following technical solutions:
A kind of capacitive touch screen comprises transparent base, and described base material is provided with at least one transparency electrode conductive layer, all has a metal line to draw on the electrode of described transparency electrode conductive layer, and described surface of metal wiring is printed with an insulating film layer.
The material of described insulating film layer is for comprising epoxy system, carbolic acid system, and propylene system, the hybrid resin of vinyl, its concentration is 40%.Described insulating film layer thickness is 20 μ m.
The present invention has also disclosed a kind of method for making of capacitive touch screen, comprises the steps:
A) select a transparent base for use, at this substrate surface plating nesa coating, described nesa coating is the ITO film;
B) etching nesa coating makes it to form one group of electrode of arranging mutually;
C) at described substrate surface metal-coated membrane;
D) etching metal film makes it to form one group of metal line that should be connected with electrode pair;
E) at described surface of metal wiring printing one deck dielectric film;
F) adopt the solid operation of heating process and the UV light described dielectric film that hardens, under 150 ℃ drying condition, dry 5～15 minutes.
Further, after described step b finishes, use the glass baseplate scrubber to clean the surface of glass baseplate immediately.
Again further, the typography of described step e comprises the steps:
A) adopt the examination printingout to regulate the position of printing screen plate, degree of regulation reaches ± 0.05mm till;
B) put into printing ink on the printing screen plate of printing machine, adjust the height that ink knife was scraped and comforted to glue, the mesh number scope of described printing screen plate is 150～620;
C) print speed printing speed of setting printing machine, scope is 50～300 mm/second.
Further, can also increase the operation of an exposure and flushing among described step e and the step f, described insulation thickness through step e printing is 4 μ m, under 90 ℃ drying condition, after dry 3 minutes, use the exposure half tone to carry out exposure, then unnecessary metal line is removed in flushing.
Beneficial effect of the present invention is mainly reflected in: manufacturing process is simple, cost is very low, and can prevent the generation of voltage ramp and galvanic corrosion phenomenon effectively, and security is very high.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: the structural representation of capacitive touch screen of the present invention.
Fig. 2: the manufacture craft process flow diagram of capacitive touch screen of the present invention.
Embodiment
The present invention has disclosed a kind of capacitive touch screen, as shown in Figure 1, comprises a transparent base 1, generally adopts glass.Described base material 1 is provided with at least one transparency electrode conductive layer, all has a metal line 3 to draw on the electrode 2 of described transparency electrode conductive layer, and the one end is a portion of terminal 4.In order to prevent the generation of voltage ramp and galvanic corrosion phenomenon, described metal line 3 surface printings have an insulating film layer 5.The material of described insulating film layer is by comprising epoxy system, carbolic acid system, and propylene system, the hybrid resin of vinyl, bubble disappear agent and solvent composition, its proportion is 40: 2: 58.Described insulating film layer thickness is generally 20 μ m.
The present invention has also disclosed a kind of method for making of capacitive touch screen, as shown in Figure 2, comprises the steps:
A) select a glass baseplate for use, at this glass baseplate surface plating nesa coating, described nesa coating is the ITO film;
B) etching nesa coating makes it to form one group of electrode of arranging mutually;
C) at described substrate surface metal-coated membrane;
D) etching metal film makes it to form one group of metal line that should be connected with electrode pair;
E) at described surface of metal wiring printing one deck dielectric film;
F) adopt the solid operation of heating process and the UV light described dielectric film that hardens, under 150 ℃ drying condition, dry 5～15 minutes.
After described step b finishes, use the glass baseplate scrubber to clean the surface of glass baseplate immediately, it is bad to prevent that printing from producing.
The typography of described step e mainly comprises the steps:
A) adopt the examination printingout to regulate the position of printing screen plate, degree of regulation reaches ± 0.05mm till;
B) put into printing ink on the printing screen plate of printing machine, adjust the height that ink knife was scraped and comforted to glue, the mesh number scope of described printing screen plate is 150～620;
C) print speed printing speed of setting printing machine, scope is 50～300 mm/second, according to the viscosity difference needs adjustment a little sometimes of print paste.
Dielectric film technology through printing is simple, and cost is also very low, the printing continuously in specification time of the precision of confirming thickness, position; And thickness is also thin than the dielectric film that prior art is made, and water vapor also can't enter this dielectric film, so also roughly the same, as follows with the effect of prior art under some concrete test conditions of the capacitive touch screen made of this method:
1) places the insulation resistance of testing [Ω cm] under 80 ℃ 90% the condition
| Initial stage | 240hr | 500hr | 1000hr | |
| The SiO2 film | 10^13 | 10^8 | 10^8 | 10^8 |
| 0CA | 10^13 | 10^8 | 10^8 | 10^8 |
| This example | 10^13 | 10^8 | 10^8 | 10^8 |
The relation of insulation resistance value is used and is represented between RH80 ℃ of 90% following standing time of condition and terminal, and the comparison of printing process of the present invention and additive method does not almost have what difference (measurement after the test back is placed 12 hours under the no energising situation).
2) energizing test [Ω cm] under 60 ℃ 90% the condition
| Initial stage | 240hr | 500hr | 1000hr | |
| The SiO2 film | Do not have | Do not have | Do not have | Do not have |
| 0CA | Do not have | Do not have | Do not have | Do not have |
| This example | Do not have | Do not have | Do not have | Do not have |
Find out that from last table the galvanic corrosion phenomenon does not take place capacitive touch screen of the present invention too in the energizing test of RH60 ℃ 90%, therefore can use relievedly fully.
The main range of application of above-mentioned preferred embodiment is 0.1 millimeter at the minimum diameter of metal line, and minimum spacing is 0.1 millimeter.
But when the minimum diameter of metal line is 0.01 millimeter, when minimum spacing is 0.01 millimeter, just need between the step e of first embodiment and step f, increase the operation of an exposure and flushing, its operation is roughly, and the insulation thickness that prints through step e is 4 μ m, under 90 ℃ drying condition, after dry 3 minutes, use the exposure half tone to carry out exposure, then unnecessary metal line (video picture) is removed in flushing.Present embodiment need use exposure machine and developing device.
The method that the present invention mainly adopts mode of printing to make dielectric film prevents the generation of galvanic corrosion phenomenon.Certainly, the metal line of every layer electrode all needs printing.For example, be respectively equipped with X electrode and Y electrode in the both sides of glass baseplate, then need all adopt printing process of the present invention in the both sides of glass baseplate.If X electrode and Y electrode then only need single treatment just passable when the occasion of same one side.
The present invention also has multiple implementation.All employings are equal to replacement or equivalent transformation and all technical schemes of forming, all drop within the scope of protection of present invention.
Claims (4)
1. the method for making of a capacitive touch screen, it is characterized in that: described capacitive touch screen comprises transparent base, described base material is provided with at least one transparency electrode conductive layer, all there is a metal line to draw on the electrode of described transparency electrode conductive layer, described surface of metal wiring is printed with an insulating film layer, the material of described insulating film layer comprises that massfraction is 40% hybrid resin, and described hybrid resin comprises epoxy system, carbolic acid system, propylene system and vinyl
The method for making of described capacitive touch screen comprises the steps,
A) select a transparent base for use, at this substrate surface plating nesa coating;
B) etching nesa coating makes it to form one group of electrode of arranging mutually;
C) at described substrate surface metal-coated membrane;
D) etching metal film makes it to form one group of metal line that should be connected with electrode pair;
E) at described surface of metal wiring printing one deck dielectric film;
F) adopt the solid operation of heating process and the UV light described dielectric film that hardens, under 150 ℃ drying condition, dry 5～15 minutes;
The typography of described step e) comprises the steps,
I) adopt the examination printingout to regulate the position of printing screen plate, degree of regulation reaches ± 0.05mm till;
II) put into printing ink on the printing screen plate of printing machine, adjust the height that ink knife was scraped and comforted to glue, the mesh number scope of described printing screen plate is 150～620;
III) print speed printing speed of setting printing machine, scope is 50～300 mm/second.
2. the method for making of capacitive touch screen according to claim 1, it is characterized in that: described nesa coating is the ITO film.
3. the method for making of capacitive touch screen according to claim 2 is characterized in that: after described step b finishes, use the glass baseplate scrubber to clean the surface of glass baseplate immediately.
4. the method for making of capacitive touch screen according to claim 1, it is characterized in that: the operation that can also increase an exposure and flushing among described step e and the step f, described insulation thickness through step e printing is 4 μ m, under 90 ℃ drying condition, after dry 3 minutes, use the exposure half tone to carry out exposure, then unnecessary metal line is removed in flushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101827881A CN101661360B (en) | 2009-09-07 | 2009-09-07 | Capacitive touch screen and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101827881A CN101661360B (en) | 2009-09-07 | 2009-09-07 | Capacitive touch screen and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN101661360A CN101661360A (en) | 2010-03-03 |
| CN101661360B true CN101661360B (en) | 2011-12-07 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101066932B1 (en) * | 2010-03-12 | 2011-09-23 | 박준영 | Method of preparing pad for touch panel and pad for touch panel prepared thereby |
| TWI398802B (en) * | 2010-07-28 | 2013-06-11 | Wei Chuan Chen | Manufacturing method of touch panel |
| CN101968697B (en) * | 2010-08-13 | 2015-12-16 | 牧东光电（苏州）有限公司 | The method of manufacture grid pattern type contact panel |
| CN102446039B (en) * | 2010-09-30 | 2015-08-12 | 陈维钏 | Contact panel manufacture method |
| CN102063235A (en) * | 2010-12-28 | 2011-05-18 | 苏州超联光电有限公司 | Capacitive screen assembly and preparation method thereof |
| CN102402359A (en) * | 2011-12-27 | 2012-04-04 | 天津美泰真空技术有限公司 | Capacitive touch screen |
| CN102689534B (en) * | 2012-06-11 | 2015-06-17 | 中建材浚鑫科技股份有限公司 | Silk-screen printing method for positive electrode of solar battery |
| CN103660511B (en) * | 2012-09-05 | 2016-08-03 | 欧卫国 | The applying method of capacitive touch screen |
| CN102955634A (en) * | 2012-10-12 | 2013-03-06 | 华映视讯（吴江）有限公司 | Touch panel and driving method thereof |
| CN103123562B (en) * | 2013-02-22 | 2016-09-07 | 城步新鼎盛电子科技有限公司 | A kind of touch-screen and preparation method thereof |
| CN103186305B (en) * | 2013-03-11 | 2016-02-24 | 城步新鼎盛电子科技有限公司 | A kind of capacitive touch screen and preparation method thereof |
| CN104199584A (en) * | 2014-09-11 | 2014-12-10 | 苏州胜利精密制造科技股份有限公司 | Novel-structured capacitive touch screen and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107767Y (en) * | 2007-11-27 | 2008-08-27 | 胜华科技股份有限公司 | Structure of capacitance type touching control panel joint zone |
| CN101270256A (en) * | 2007-03-23 | 2008-09-24 | 上海宝庆通用电工有限公司 | Water-soluble insulating varnish and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270256A (en) * | 2007-03-23 | 2008-09-24 | 上海宝庆通用电工有限公司 | Water-soluble insulating varnish and preparation method thereof |
| CN201107767Y (en) * | 2007-11-27 | 2008-08-27 | 胜华科技股份有限公司 | Structure of capacitance type touching control panel joint zone |
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