CN102819341A - Production method of touch panels - Google Patents
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- CN102819341A CN102819341A CN2011101540766A CN201110154076A CN102819341A CN 102819341 A CN102819341 A CN 102819341A CN 2011101540766 A CN2011101540766 A CN 2011101540766A CN 201110154076 A CN201110154076 A CN 201110154076A CN 102819341 A CN102819341 A CN 102819341A
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Abstract
The invention relates to a production method of touch panels. The production method includes the steps of providing an insulating substrate provided with a touch area and a wiring area on one surface; forming an adhesive layer on the surface of the insulating substrate; solidifying the adhesive layer in the wiring area; forming a carbon nanotube layer on the surface of the adhesive layer; solidifying the adhesive layer in the touch area to fix the carbon nanotube layer in the touch area; removing the carbon nanotube layer in the wiring area to form a transparent conductive layer; and forming electrodes and conductive circuits.
Description
Technical field
The present invention relates to a kind of preparation method of touch panel, relate in particular to a kind of preparation method of the touch panel based on CNT.
Background technology
In recent years, be accompanied by the high performance and the diversified development of various electronic equipments such as mobile phone and touch navigation system, the electronic equipment that the touch-screen of light transmission is installed in the front of display devices such as liquid crystal progressively increases.The user of such electronic equipment is through touch-screen, on one side the displaying contents of the display device that is positioned at the touch-screen back side is carried out visual confirmation, utilize finger or pointer etc. to push touch-screen on one side and operate.Thus, various functions that can operating electronic equipment.
Different according to the principle of work of touch-screen and transmission medium, existing touch-screen is divided into four types, is respectively resistance-type, condenser type, infrared-type and surface acoustic wave type.Wherein the application of capacitive touch screen and resistive touch screen is more extensive.
Condenser type of the prior art and resistive touch screen generally include at least one indium tin oxide layer as transparency conducting layer (ITO layer).Yet the ITO layer adopts prepared such as ion beam sputtering or vapor deposition usually as transparency conducting layer, in the process of preparation, needs higher vacuum environment and need be heated to 200 ℃ ~ 300 ℃, therefore, makes that the preparation cost of ITO layer is higher.In addition, the method for removing part ITO layer is generally laser ablation, and this method not only preparation cost is higher, and preparation efficiency is lower.
Summary of the invention
In view of this, necessaryly provide a kind of preparation cost low, and the preparation method of the high touch panel of efficient.
A kind of preparation method of touch panel, this method may further comprise the steps: a dielectric base is provided, and two zones of definition are gone up on a surface of this dielectric base: a touch area and cabling zone; Form an adhesive-layer on the surface of said dielectric base; Solidify the adhesive-layer that is positioned at said cabling zone; Form a carbon nanotube layer on the adhesive-layer surface; Solidify the adhesive-layer that is positioned at said touch area, fix with the carbon nanotube layer that will be positioned at the touch area; The carbon nanotube layer that removal is positioned at the cabling zone obtains a transparency conducting layer; And formation electrode and conducting wire.
A kind of preparation method of touch panel, this method may further comprise the steps: a dielectric base is provided, and two zones of definition are gone up on a surface of this dielectric base: a touch area and cabling zone; Form an adhesive-layer on the surface of said dielectric base; Solidify the adhesive-layer that is positioned at said cabling zone; Form a carbon nanotube layer on the adhesive-layer surface; Solidify the adhesive-layer that is positioned at said touch area, fix with the carbon nanotube layer that will be positioned at the touch area; Form electrode and conducting wire; And remove the carbon nanotube layer be positioned at the cabling zone and obtain a transparency conducting layer.
Compared with prior art; The touch-screen that the embodiment of the invention provides has the following advantages: because present embodiment makes the adhesive-layer that is positioned at the cabling zone solidify earlier; The back forms carbon nanotube layer; So greatly reduce the difficulty of the carbon nanotube layer of removing the cabling zone, thereby reduced preparation cost, improved preparation efficiency.
Description of drawings
The vertical view of the touch panel that Fig. 1 provides for the embodiment of the invention.
Fig. 2 is the sectional view of the touch panel II-II along the line of Fig. 1.
The cabling zone of the touch panel that Fig. 3 to Fig. 6 provides for the embodiment of the invention and the location diagram of touch area.
Fig. 7 is the stereoscan photograph of the transparency conducting layer in the touch panel of Fig. 1.
Preparation technology's process flow diagram of the touch panel that Fig. 8 provides for the embodiment of the invention.
The STRUCTURE DECOMPOSITION figure of the touch-screen that Fig. 9 provides for the embodiment of the invention.
Figure 10 is the sectional view of the touch-screen X-X along the line of Fig. 9.
The touch point positioning system of the touch-screen that Figure 11 provides for first embodiment of the invention.
Figure 12 is first transparency conducting layer and the merging synoptic diagram of second transparency conducting layer among Figure 11.
The main element symbol description
| |
10 |
| The |
10A, 20A |
| The |
10B, 20B |
| |
12 |
| Adhesive- |
13 |
| Transparency conducting |
14 |
| Mask | 15 |
| Electrode | 16 |
| The conducting |
18 |
| Carbon nanotube layer | 19 |
| Touch- |
20 |
| Second |
220 |
| First conducting |
221 |
| First |
222 |
| |
223 |
| Second |
224 |
| |
225 |
| First |
226 |
| Second conducting |
227 |
| The 3rd |
228 |
| |
22 |
| |
24 |
| |
26 |
Following embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
To combine accompanying drawing and specific embodiment below, touch panel provided by the invention and preparation method thereof is done further to specify.The embodiment of the invention at first provides a kind of touch panel.
See also Fig. 1 and Fig. 2, the embodiment of the invention provides a kind of touch panel 10, and this touch panel 10 comprises a dielectric base 12, one transparency conducting layers 14, at least one electrode 16 and a conducting wire 18.
Said touch panel 10 definition have two zones: a touch area 10A and cabling zone 10B.Said touch area 10A is the zone that said touch panel 10 can be realized touch controllable function by touching, and said cabling zone 10B is the zone that said touch panel 10 interior conducting wires and electrode are provided with.Said cabling zone 10B is touch panel 10 submarginal zones than small size, and it can be positioned at least one side of touch area 10A.Said touch area 10A is the larger area zone that comprises touch panel 10 central areas.Said cabling zone 10B is usually located at the periphery of said touch area 10A.The position relation of said touch area 10A and cabling zone 10B is not limit, and can select as required.Below provide when said touch panel 10 is rectangle several kinds of positions relations of touch area 10A and cabling zone 10B.
As shown in Figure 1, said cabling zone 10B can be the annular region near touch panel 10 edges, said touch area 10A be cabling zone 10B around the zone; As shown in Figure 3, said cabling zone 10B can be the strip region near touch panel 10 one side, and said touch area 10A is the zone beyond the 10B of cabling zone; As shown in Figure 4, said cabling zone 10B can be for respectively near the parallel strip zone on touch panel 10 relative both sides, and said touch area 10A is the zone between the 10B of cabling zone; As shown in Figure 5, said cabling zone 10B can be the L shaped strip region near touch panel 10 adjacent both sides, and said touch area 10A is the zone beyond the 10B of cabling zone; As shown in Figure 6, said cabling zone 10B can be the U-shaped strip region near three adjacent limits of touch panel 10, and said touch area 10A is the zone beyond the 10B of cabling zone.In the present embodiment, said touch area 10A is the central area of touch panel 10, and said cabling zone 10B is around touch area 10A.Identical and the area of the shape of the shape of said touch area 10A and touch panel 10 is less than the area of touch panel 10, and said cabling zone 10B is other zone beyond the 10A of touch area.
Said transparency conducting layer 14, electrode 16 and conducting wire 18 are arranged at a surface of dielectric base 12 respectively.Wherein, said transparency conducting layer 14 only is arranged at the surface that dielectric base 12 is positioned at touch area 10A.Said conducting wire 18 only is arranged at the surface that dielectric base 12 is positioned at cabling zone 10B.Said electrode 16 is arranged at said transparency conducting layer 14 at least one sides, and is electrically connected respectively with conducting wire 18 and transparency conducting layer 14.Said conducting wire 18 is electrically connected this transparency conducting layer 14 with an external circuits (figure does not show).Because transparency conducting layer 14 of the present invention only is arranged at the surface that dielectric base 12 is positioned at touch area 10A; And conducting wire 18 only is arranged at the surface that dielectric base 12 is positioned at cabling zone 10B; That is, transparency conducting layer 14 and conducting wire 18 not have the part that overlaps, so when pointer or finger touches arrive the regional 10B of cabling; Can between conducting wire 18 and transparency conducting layer 14, not produce the capacitance interference signal, thus the accuracy that has further improved touch-screen.
Said dielectric base 12 is the structure of a curved face type or plane.This dielectric base 12 has suitable transparency, and mainly plays a part to support.This dielectric base 12 is formed by hard materials such as glass, quartz, adamas or plastics or flexible material.Particularly; Said flexible material may be selected to be polycarbonate (PC), polymethylmethacrylate (PMMA), tygon (PE), polyimide (PI) or polyethylene terephthalate polyester materials such as (PET), or materials such as polyethersulfone (PES), cellulose esters, PVC (PVC), benzocyclobutene (BCB) or acryl resin.In the present embodiment, said dielectric base 12 is the structure of a plane, and this dielectric base 12 is flexible polycarbonate (PC).Be appreciated that the material that forms said dielectric base 12 is not limited to the above-mentioned material of enumerating,, and have suitable transparency and get final product as long as can make dielectric base 12 play the effect of support.
Said transparency conducting layer 14 comprises a carbon nanotube layer.Said carbon nanotube layer is made up of some CNTs, and the bearing of trend of most of CNTs is basically parallel to the surface of this carbon nanotube layer in this carbon nanotube layer.The thickness of said carbon nanotube layer is not limit, and can select as required; The thickness of said carbon nanotube layer is 0.5 nanometer ~ 100 micron; Preferably, the thickness of this carbon nanotube layer is 100 nanometers ~ 200 nanometers.Because the even carbon nanotube in the said carbon nanotube layer distributes and has good flexible, makes this carbon nanotube layer have good flexible, can bending fold become arbitrary shape and be difficult for breaking.In the present embodiment, said transparency conducting layer 14 is merely a carbon nanotube layer.
CNT in the said carbon nanotube layer comprises one or more in SWCN, double-walled carbon nano-tube and the multi-walled carbon nano-tubes.The diameter of said SWCN is 0.5 nanometer ~ 50 nanometers, and the diameter of double-walled carbon nano-tube is 1.0 nanometers ~ 50 nanometers, and the diameter of multi-walled carbon nano-tubes is 1.5 nanometers ~ 50 nanometers.The length of said CNT is greater than 50 microns.Preferably, the length of this CNT is preferably 200 microns ~ 900 microns.
Unordered or the orderly arrangement of CNT in the said carbon nanotube layer.So-called lack of alignment is meant that the orientation of CNT is random.The so-called arrangement in order is meant that the orientation of CNT is regular.Particularly, when carbon nanotube layer comprised the CNT of lack of alignment, CNT twined each other or isotropy is arranged; When carbon nanotube layer comprised orderly carbon nanotubes arranged, CNT was arranged of preferred orient along a direction or a plurality of directions.So-called " preferred orientation " is meant that the most of CNTs in the said carbon nanotube layer have bigger orientation probability on a direction or several direction; That is, the axially basic of the most of CNTs in this carbon nanotube layer extended along same direction or several direction.Have the gap between the adjacent CNT among the said carbon nanotube layer, thereby in carbon nanotube layer, form a plurality of gaps.
Said carbon nanotube layer comprises at least one carbon nano-tube film.When said carbon nanotube layer comprised a plurality of carbon nano-tube film, this carbon nano-tube film can be provided with or range upon range of setting by substantially parallel no gap coplane.See also Fig. 7, the self supporting structure that said carbon nano-tube film is made up of some CNTs.Said some CNTs are arranged of preferred orient along same direction.The whole bearing of trend of most of CNTs basically in the same direction in this carbon nano-tube film.And the whole bearing of trend of said most of CNTs is basically parallel to the surface of carbon nano-tube film.Further, most CNTs are to join end to end through Van der Waals (Van Der Waals) power in the said carbon nano-tube film.Particularly, each CNT joins end to end through Van der Waals force with adjacent CNT on bearing of trend in the most of CNTs that extend basically in the same direction in the said carbon nano-tube film.Certainly, have the CNT of minority random alignment in the said carbon nano-tube film, these CNTs can not arranged the overall orientation of most of CNTs in the carbon nano-tube film and constitute obviously influence.Said carbon nano-tube film does not need large-area supported; And as long as the relative both sides power of providing support can be unsettled on the whole and keep self membranaceous state; When being about to this carbon nano-tube film and placing on two supporters that (or being fixed in) be provided with at interval, the carbon nano-tube film between two supporters can the membranaceous state of unsettled maintenance self.
Particularly, the most CNTs that extend basically in the same direction in the said carbon nano-tube film, and nisi linearity, bending that can be suitable; Perhaps be not fully according to arranging on the bearing of trend, can be suitable depart from bearing of trend.Therefore, can not get rid of between the CNT arranged side by side in the most CNTs that extend basically in the same direction of carbon nano-tube film and possibly have the part contact.
Particularly, said carbon nano-tube film comprise a plurality of continuously and the CNT fragment that aligns.These a plurality of CNT fragments join end to end through Van der Waals force.Each CNT fragment comprises a plurality of CNTs that are parallel to each other, and these a plurality of CNTs that are parallel to each other are combined closely through Van der Waals force.This CNT fragment has length, thickness, homogeneity and shape arbitrarily.CNT in this carbon nano-tube film is arranged of preferred orient along same direction.
Said carbon nano-tube film can be through directly pulling acquisition from carbon nano pipe array.Be appreciated that through a plurality of carbon nano-tube films are parallel and do not have that the gap coplane is laid or/and range upon range of laying, can prepare the carbon nanotube layer of different area and thickness.The thickness of each carbon nano-tube film can be 0.5 nanometer ~ 100 micron.When carbon nanotube layer comprised the carbon nano-tube film of a plurality of range upon range of settings, the orientation of the CNT in the adjacent carbon nano-tube film formed an angle, 0≤α≤90.
Said carbon nano-tube film can be through directly pulling acquisition from carbon nano pipe array.Particularly, at first on the substrate of quartz or wafer or other material, grow carbon nano pipe array, for example use chemical gaseous phase Shen to amass (Chemical Vapor Deposition, CVD) method; Then, with stretching technique CNT is pulled out from carbon nano pipe array one by one and formed.These CNTs are able to by Van der Waals force join end to end, and form the conductive elongate structure that tool certain orientation property and almost parallel are arranged.Formed carbon nano-tube film can be in the minimum electrical impedance of the direction tool that stretches, and perpendicular to the maximum electrical impedance of draw direction tool, thereby possess electrical impedance anisotropy.
Said carbon nano-tube film can directly be layed in the surface of dielectric base 12, also can be fixed in said dielectric base 12 surfaces through an adhesive-layer 13.The effect of said adhesive-layer 13 is in order to make said carbon nano-tube film adhere to the surface of said dielectric base 12 better.Said adhesive-layer 13 is transparent, and the material of this adhesive-layer 13 is for having low-melting thermoplastic or UV (Ultraviolet Rays) glue, like PVC or PMMA etc.The thickness of said adhesive-layer 13 is 1 nanometer ~ 500 micron; Preferably, the thickness of said adhesive-layer 13 is 1 micron ~ 2 microns.In the present embodiment, the material of said adhesive-layer 13 is a UV glue, and the thickness of this adhesive-layer 13 is about 1.5 microns.
Said electrode 16 can be arranged at the surface that dielectric base 12 is positioned at cabling zone 10B; Also can be arranged at the surface that dielectric base 12 is positioned at touch area 10A; Can also partly be arranged at dielectric base 12 and be positioned at the surface of cabling zone 10B, part is arranged at the surface that dielectric base 12 is positioned at touch area 10A.Said electrode 16 that the position is set is relevant with the touch point detection method with the touch-control principle of the touch-screen that adopts this touch panel 10; The number of said electrode 16 is relevant with touch-control resolution with the area of this touch panel 10, can select according to the practical application situation.When the area of touch panel 10 is big more, when resolution requirement was high more, the number of said electrode 16 was many more.Vice versa.In the present embodiment, said touch panel 10 comprises six electrodes 16, and these six electrodes 16 are arranged at intervals at transparency conducting layer 14 1 sides.The material of said electrode 16 is other conductive materials such as metal, CNT, electrocondution slurry or ITO, can conduct electricity as long as guarantee this electrode 16.Said electrode 16 can pass through the etching conductive film, like metallic film or indium tin oxide films preparation, and also can be through the silk screen print method preparation.
Said conducting wire 18 comprises a plurality of leads, and its material can be other conductive materials such as metal, CNT, electrocondution slurry or ITO.The etching conductive film can be passed through in said conducting wire 18, like metallic film or indium tin oxide films preparation, and also can be through the silk screen print method preparation.In the present embodiment, said electrode 16 is conductive silver slurry with conducting wire 18, and this electrode 16 and conducting wire 18 form through silk screen print method simultaneously.
See also Fig. 8, the embodiment of the invention further provides a kind of preparation method of touch panel 10, and it may further comprise the steps:
Step 1 provides a dielectric base 12, and forms an adhesive-layer 13 on a surface of this dielectric base 12.Wherein, touch area 10A and the 10B definition of cabling zone according to above-mentioned Fig. 3 touch panel 10 extremely shown in Figure 6 has touch area 10A and cabling zone 10B on the said surface of said dielectric base 12.
The material of said adhesive-layer 13 is not limit, so long as under a certain condition, can realize local solidification viscose glue can, like thermoplastic, hot-setting adhesive or UV glue etc.The method of said formation one adhesive-layer 13 can be spin-coating method, spraying process, brushing etc.In the present embodiment, said dielectric base 12 is a PET film.Said adhesive-layer 13 is that a thickness is about 1.5 microns UV glue-line, and it is formed at PET film one surface through the method that applies.
Step 2 is solidified the adhesive-layer 13 that is positioned at cabling zone 10B.
It is relevant with the material of adhesive-layer 13 that said curing is positioned at the method for adhesive-layer 13 of cabling zone 10B.Said thermoplastic can pass through local cooling curing, and said hot-setting adhesive can solidify through spot heating, and said UV glue can solidify through local ultraviolet lighting.
In the present embodiment, the method that said curing is positioned at the adhesive-layer 13 of cabling zone 10B may further comprise the steps:
The UV glue-line that at first, will be positioned at touch area 10A through a mask 15 blocks;
Secondly, adopt UV-irradiation to be positioned at the UV glue-line of cabling zone 10B, so that be positioned at the UV curable adhesive layer of cabling zone 10B;
Then, remove mask 15.
The said mask 15 unsettled surfaces that are arranged at said adhesive-layer 13 away from dielectric base 12.The time of said UV-irradiation is 2 seconds ~ 30 seconds.In the present embodiment, the time of said UV-irradiation is 4 seconds.
Step 3 forms a carbon nanotube layer 19 on adhesive-layer 13 surfaces.
Said carbon nanotube layer 19 can be formed at adhesive-layer 13 surfaces through methods such as printing, deposition or direct layings.In the present embodiment, said carbon nanotube layer 19 is one to have the carbon nano-tube film of self-supporting effect, and it can directly be layed in whole adhesive-layer 13 surfaces.After carbon nanotube layer 19 is formed at adhesive-layer 13 surfaces; Because being positioned at the part of cabling zone 10B, adhesive-layer 13 has cured; Only be formed at adhesive-layer 13 surfaces so be positioned at the carbon nanotube layer 19 of cabling zone 10B, and combine with the adhesive-layer 13 of curing through Van der Waals force.Therefore, the said carbon nanotube layer 19 that is positioned at cabling zone 10B is fainter with the adhesion of adhesive-layer 13.Because it is still uncured that adhesive-layer 13 is positioned at the part of touch area 10A, can partly or entirely soak into adhesive-layer 13 so be arranged in 19 of the carbon nanotube layers of touch area 10A, and combine with adhesive-layer 13 through cohesive force.Therefore, the said carbon nanotube layer that is positioned at touch area 10A 19 is more firm with the adhesion of adhesive-layer 13.Preferably, the said CNT that is arranged in the carbon nanotube layer 19 of touch area 10A partly soaks into adhesive-layer 13, and part is exposed to outside the adhesive-layer 13.
Further, soak into adhesive-layer 13, can also comprise the step of this carbon nanotube layer 19 of extruding in order to make the carbon nanotube layer 19 that is arranged in touch area 10A.In the present embodiment, adopt a PET film to be layed in carbon nanotube layer 19 surfaces, this carbon nanotube layer 19 of extruding gently.
Step 4 is solidified the adhesive-layer 13 that is positioned at touch area 10A, and is fixing with the carbon nanotube layer 19 that will be positioned at touch area 10A.
The method of adhesive-layer 13 that said curing is positioned at touch area 10A is identical with step 2, need select according to the material of adhesive-layer 13.Said curing is positioned at that the step of adhesive-layer 13 of touch area 10A is actual to be cured for the uncured portion that adhesive-layer 13 is positioned at touch area 10A.Soak into adhesive-layer 13 owing to be arranged in the carbon nanotube layer 19 of touch area 10A, can be fixed in the process that adhesive-layer 13 solidifies so be arranged in the carbon nanotube layer 19 of touch area 10A in this step.And the adhesive-layer 13 that is positioned at cabling zone 10B has cured, can be unfixing by adhesive-layer 13 so be positioned at the carbon nanotube layer 19 of cabling zone 10B.In the present embodiment, the method through UV-irradiation makes the UV adhesive curing that is positioned at touch area 10A.
Step 5 is removed the carbon nanotube layer 19 that is positioned at cabling zone 10B and is obtained a transparency conducting layer 14.
Said removal is positioned at the method for the carbon nanotube layer 19 of cabling zone 10B and can peels off or peel off through cleaning roller for boning through adhesive tape.Said cleaning roller surface has certain viscosity, can carbon nanotube layer 19 clung and peel off.Because being positioned at the carbon nanotube layer 19 of cabling zone 10B only combines with adhesive-layer 13 through Van der Waals force; With adhesive-layer 13 surface combination power a little less than, so roll and can easily the carbon nanotube layer 19 of this cabling zone 10B be removed through adhesive tape bonding or cleaning roller.In the present embodiment, will be positioned at carbon nanotube layer 19 removals of cabling zone 10B through the method for adhesive tape bonding.Because present embodiment makes the adhesive-layer 13 that is positioned at cabling zone 10B solidify earlier, the back forms carbon nanotube layer 19, so greatly reduce the difficulty of the carbon nanotube layer 19 of removing cabling zone 10B.Certainly, remove the carbon nanotube layer 19 that is positioned at cabling zone 10B and can also take other modes, such as laser ablation, particle beams etching or beamwriter lithography etc.
Step 6 forms electrode 16 and conducting wire 18.
Said electrode 16 can pass through method preparations such as silk screen print method, chemical vapor deposition, magnetron sputtering with conducting wire 18.In the present embodiment, said electrode 16 is integrally formed through the serigraphy electrocondution slurry with conducting wire 18.The composition of this electrocondution slurry comprises metal powder, glass powder with low melting point and cementing agent.Wherein, this metal powder is preferably silver powder, and this cementing agent is preferably terpinol or ethyl cellulose.In this electrocondution slurry, the weight ratio of metal powder is 50% ~ 90%, and the weight ratio of glass powder with low melting point is 2% ~ 10%, and the weight ratio of cementing agent is 8% ~ 40%.
Be appreciated that step 5 and the order of step 6 in the present embodiment can exchange, promptly form electrode 16 and conducting wire 18 earlier, and then remove the carbon nanotube layer 19 that is positioned at cabling zone 10B.In this method, conducting wire 18 is formed at carbon nanotube layer 19 surfaces that are positioned at cabling zone 10B.Owing to form electrode 16 and conducting wire 18 earlier, be preferably laser ablation, particle beams etching or beamwriter lithography etc. so remove the method for the carbon nanotube layer 19 that is positioned at cabling zone 10B in this method.Owing to form electrode 16 and conducting wire 18 earlier, and then remove the carbon nanotube layer 19 that is positioned at cabling zone 10B, so kept the part CNT between the electrode 16 of the touch panel 10 of this method preparation and conducting wire 18 and the adhesive-layer 13.Required contraposition mask (mark) when the conducting wire 18 that is appreciated that said serigraphy can be used as laser ablation.
Be appreciated that; Surface through at the touch panel 10 of present embodiment preparation is provided with an optical clear glue-line (OCA Layer) and a cover plate (Cover Lens), can obtain a touch-screen thereby cover above-mentioned transparency conducting layer 14, electrode 16 and conducting wire 18.
The present invention further provides a kind of touch-screen that adopts the touch panel of said structure.Touch panel provided by the invention is applicable to the touch-screen of various employing structure of transparent conductive layer such as condenser type single-point touches screen, condenser type multi-point touch panel, resistance-type single-point touches screen, resistance-type multi-point touch panel.The embodiment of the invention is that example specifies with the condenser type multi-point touch panel only.
See also Fig. 9 and Figure 10; The embodiment of the invention provides a kind of capacitive touch screen 20, and this touch-screen 20 comprises one first dielectric base 226, one second dielectric base 220, one first transparency conducting layer 222, one second transparency conducting layer 224, a plurality of first electrode 223, a plurality of second electrode 225, one first conducting wire 221, one second conducting wire 227 and one the 3rd dielectric base 228.
Said touch-screen 20 definition have two zones: a touch area 20A and cabling zone 20B.In the present embodiment, said touch-screen 20 is a rectangle, said cabling zone 20B be said touch-screen 20 near the L shaped strip region in the edge on adjacent both sides, said touch area 20A is other zone beyond the 20B of cabling zone.
Said first dielectric base 226, second transparency conducting layer 224, second dielectric base 220, first transparency conducting layer 222 and the 3rd dielectric base 228 from bottom to top are cascading.In this manual, " on " D score only refers to relative orientation.In the present embodiment, " on " referring to the direction of touch-screen 20 near the touching surface, D score refers to the direction of touch-screen 20 away from the touching surface.Said second transparency conducting layer 224 is than the touching surface of first transparency conducting layer 222 away from touch-screen 20.Said first transparency conducting layer 222 and second transparency conducting layer 224 are arranged at second dielectric base, 220 two opposite surfaces respectively.Said first dielectric base 226 is arranged at said second transparency conducting layer, 224 lower surfaces, and second transparency conducting layer 224 is covered.Said the 3rd dielectric base 228 is arranged at said first transparency conducting layer, 222 upper surfaces, and said first transparency conducting layer 222 is covered.Further consult Figure 11 and Figure 12, said a plurality of first electrodes 223 are provided with at interval and are electrically connected with said first transparency conducting layer 222.Said a plurality of second electrode 225 is provided with at interval and is electrically connected with said second transparency conducting layer 224.Said first conducting wire 221 is electrically connected a plurality of first electrodes 223 with a sensing (Sensing) circuit 22.Said second conducting wire 227 drives (Driving) circuit 24 with a plurality of second electrodes 225 and and is electrically connected.Yet,, also can insert other extra layer between above-mentioned each layer according to the demand of various functions.
Said first transparency conducting layer 222 and second transparency conducting layer 224 only are arranged at the surface that second dielectric base 220 is positioned at touch area 20A.Said first transparency conducting layer 222 and second transparency conducting layer 224 are the conducting film of tool electrical impedance anisotropy, for example carbon nano-tube film, or through the carbon nano-tube film of etching or lasser cutting.Through under the situation of lasser cutting, on the carbon nano-tube film plural laser cut line will be arranged at carbon nano-tube film, such processing can't influence the electrical impedance anisotropy that carbon nano-tube film originally just had.In the present embodiment, first transparency conducting layer 222 is the indium tin oxide layer of patterning, and second transparency conducting layer 224 is the carbon nano-tube film without etching or lasser cutting.
Said first transparency conducting layer 222 and the second transparency conducting layer tool electrical impedance anisotropy.Said first transparency conducting layer 222 is in the electrical impedance of the electrical impedance that is parallel to a first direction on the conductive layer surface less than other direction, that is, said first transparency conducting layer 222 is minimum in the electrical impedance of this first direction.Said second transparency conducting layer 224 is in the electrical impedance of the electrical impedance that is parallel to a second direction on the conductive layer surface less than other direction, that is, said second transparency conducting layer 224 is minimum in the electrical impedance of this second direction.Said first direction is perpendicular to said second direction.Said a plurality of first electrode 223 is arranged at intervals at the side that first transparency conducting layer 222 is parallel to second direction.Said a plurality of second electrode 225 is arranged at intervals at the side that second transparency conducting layer 224 is parallel to first direction.In the present embodiment, said first direction is a directions X, and said second direction is the Y direction.Said a plurality of first electrode 223 is provided with at interval and arranges along the Y direction, and said a plurality of second electrodes 225 are provided with at interval and arrange along directions X.
Said first conducting wire 221 and second conducting wire 227 only are arranged at cabling zone 10B.Said first conducting wire 221 is conductive silver slurry with a plurality of first electrodes 223, and forms simultaneously through silk screen print method.Said second conducting wire 227 also is conductive silver slurry with the material of a plurality of second electrodes 225, and forms simultaneously through silk screen print method.
Said first dielectric base 226, second dielectric base 220 and the 3rd dielectric base 228 are the structure of a curved face type or plane.This said first dielectric base 226 is equivalent to infrabasal plate, mainly plays a part to support.This second dielectric base 220 mainly plays insulation and isolates.The 3rd dielectric base 228 is equivalent to upper substrate, can improve the permanance of touch-screen 20 and experience with touching.The material of this first dielectric base 226, second dielectric base 220 and the 3rd dielectric base 228 is identical with the material of above-mentioned dielectric base 12.In the present embodiment, this first dielectric base 226, second dielectric base 220 and the 3rd dielectric base 228 are a polyester film.Said the 3rd dielectric base 228 can be fitted fixing through an optical clear glue-line (figure does not show) and first transparency conducting layer 222.The material of said optical clear glue-line is an acryl etc.
Figure 11 shows the touch points positioning system of the touch-screen 20 of the embodiment of the invention, wherein, first transparency conducting layer 222 along first direction for example the electrical impedance of X-direction or y direction be minimum with respect to the electrical impedance on other direction; Second transparency conducting layer 224 along second direction for example the electrical impedance of Y direction or X direction be minimum with respect to the electrical impedance on other direction.Each first electrode 223 is connected to a sensing circuit 22 through first conducting wire 221 respectively, and it is in order to read the induced electricity signal of each first electrode 223.Each second electrode 225 is connected to one drive circuit 24 through second conducting wire 227 respectively, and its electric signal of importing same pulse waveform or other waveform one by one or simultaneously is to each second electrode 225.In other words, first electrode 223 at this as sensing electric signal contact mat, second electrode 225 at this as driving the electric signal contact mat.Sensing circuit 22 and driving circuit 24 are by 26 controls of a controller.
Figure 12 shows the merging synoptic diagram of first transparency conducting layer 222 and second transparency conducting layer 224 among Figure 11.In the synoptic diagram of Figure 11 and Figure 12, shown 13 first electrodes 223, and seven second electrodes 225.Touch points positioning system by Figure 11 and touch-screen 20 shown in Figure 12; When pointer or finger touches during to touch-screen 20; Second capacitor C, 2 values that produce between first capacitor C, 1 value that is produced between first transparency conducting layer 222 and second transparency conducting layer 224 and first transparency conducting layer 222 and pointer or the finger; Will cause the sensing electric signal of all first electrodes 223 to have specific characteristic, thereby the touching surface that can judge touch-screen 20 by this position coordinates for example X axle or the coordinate of transverse axis and the coordinate of the Y axle or the longitudinal axis of going up touch points.
The touch-screen that the embodiment of the invention provides has the following advantages: first; CNT has excellent mechanical characteristic makes carbon nanotube layer have good toughness and physical strength; And anti-bending so adopt carbon nanotube layer as transparency conducting layer, can improve the durability of touch-screen accordingly; And then the durability of the display device of this touch-screen is used in raising; The second, because carbon nanotube layer comprises a plurality of equally distributed CNTs, so this carbon nanotube layer also has uniform resistance and distributes, and therefore, adopts this carbon nanotube layer can improve the sensitivity and the degree of accuracy of touch-screen accordingly as transparency conducting layer; The 3rd; Because carbon nanotube layer only is arranged at the surface that dielectric base is positioned at the touch area, and the conducting wire only is arranged at the surface that dielectric base is positioned at the cabling zone, promptly; Carbon nanotube layer and conducting wire do not have the part of overlapping; So, can between conducting wire and carbon nanotube layer, not produce the capacitance interference signal, thereby accuracy that has improved touch-screen when pointer or finger touches during to the cabling zone.
In addition, those skilled in the art can also do other and change in spirit of the present invention, and these all should be included in the present invention's scope required for protection according to the variation that the present invention's spirit is done.
Claims (12)
1. the preparation method of a touch panel, this method may further comprise the steps:
One dielectric base is provided, and two zones of definition are gone up on a surface of this dielectric base: a touch area and cabling zone;
Form an adhesive-layer on the surface of said dielectric base;
Solidify the adhesive-layer that is positioned at said cabling zone;
Form a carbon nanotube layer on the adhesive-layer surface;
Solidify the adhesive-layer that is positioned at said touch area, fix with the carbon nanotube layer that will be positioned at the touch area;
The carbon nanotube layer that removal is positioned at the cabling zone obtains a transparency conducting layer; And
Form electrode and conducting wire.
2. the preparation method of touch panel as claimed in claim 1 is characterized in that, the material of said adhesive-layer is a thermoplastic, and the method that said curing is positioned at the adhesive-layer in cabling zone is local cooling method.
3. the preparation method of touch panel as claimed in claim 1 is characterized in that, the material of said adhesive-layer is a hot-setting adhesive, and the method that said curing is positioned at the adhesive-layer in cabling zone is the spot heating method.
4. the preparation method of touch panel as claimed in claim 1 is characterized in that, the material of said adhesive-layer is a UV glue, and the method that said curing is positioned at the adhesive-layer in cabling zone is local uv irradiation method.
5. the preparation method of touch panel as claimed in claim 4 is characterized in that, the method that said curing is positioned at the adhesive-layer in cabling zone may further comprise the steps:
The UV glue-line that will be positioned at the touch area through a mask blocks;
Adopt UV-irradiation to be positioned at the UV glue-line in cabling zone; And
Remove mask.
6. the preparation method of touch panel as claimed in claim 1 is characterized in that, said carbon nanotube layer forms through the method for printing, deposition or directly laying.
7. the preparation method of touch panel as claimed in claim 1; It is characterized in that; Said surface at adhesive-layer forms after the step of a carbon nanotube layer; The carbon nanotube layer that is positioned at the cabling zone only is formed at the adhesive-layer surface of curing, and the carbon nanotube layer that is arranged in the touch area partly or entirely soaks into uncured adhesive-layer.
8. the preparation method of touch panel as claimed in claim 1; It is characterized in that; Said surface at adhesive-layer forms after the step of a carbon nanotube layer, further comprises this carbon nanotube layer of extruding, thereby makes the carbon nanotube layer that is arranged in the touch area soak into the step of adhesive-layer.
9. the preparation method of touch panel as claimed in claim 1 is characterized in that, said removal is positioned at the method for the carbon nanotube layer in cabling zone and peels off or peel off through cleaning roller for boning through adhesive tape.
10. the preparation method of touch panel as claimed in claim 1 is characterized in that, said electrode and conducting wire are through silk screen print method, chemical vapour deposition technique or magnetron sputtering method preparation.
11. the preparation method of a touch panel, this method may further comprise the steps:
One dielectric base is provided, and two zones of definition are gone up on a surface of this dielectric base: a touch area and cabling zone;
Form an adhesive-layer on the surface of said dielectric base;
Solidify the adhesive-layer that is positioned at said cabling zone;
Form a carbon nanotube layer on the adhesive-layer surface;
Solidify the adhesive-layer that is positioned at said touch area, fix with the carbon nanotube layer that will be positioned at the touch area;
Form electrode and conducting wire; And
The carbon nanotube layer that removal is positioned at the cabling zone obtains a transparency conducting layer.
12. the preparation method of touch panel as claimed in claim 11 is characterized in that, the method that said removal is positioned at the carbon nanotube layer in cabling zone is laser ablation method, particle beams etching method or beamwriter lithography method.
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