CN102819338A - Production method of touch panel - Google Patents
Production method of touch panel Download PDFInfo
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- CN102819338A CN102819338A CN2011101540709A CN201110154070A CN102819338A CN 102819338 A CN102819338 A CN 102819338A CN 2011101540709 A CN2011101540709 A CN 2011101540709A CN 201110154070 A CN201110154070 A CN 201110154070A CN 102819338 A CN102819338 A CN 102819338A
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Abstract
The invention relates to a touch panel which is provided with a touch area and a wiring area. The touch panel comprises an insulating substrate having a surface, an adhesive layer, a transparent conductive layer, at least one electrode and a conductive circuit. The adhesive layer is arranged on the surface of the insulating substrate. The transparent conductive layer comprises a carbon nanotube layer and is fixed on the surface of the insulating substrate through the adhesive layer. The electrodes are electrically connected with the transparent conductive layer. The conductive circuit is electrically connected with the electrodes. The adhesive layer and the transparent conductive layer are only disposed at the touch area. The electrodes and the conductive circuit are only disposed on the surface of the insulating substrate in the wiring area. The invention further relates to a production method of the touch panel.
Description
Technical field
The present invention relates to a kind of touch panel and preparation method thereof, relate in particular to a kind of touch panel based on CNT and preparation method thereof.
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 ITO layer is after constantly bending, and the resistance of its bending place increases to some extent, and it has machinery and the imperfect shortcoming of chemical durability as transparency conducting layer, and has the phenomenon that resistance is inhomogeneous and the resistance value scope is less.Thereby cause existing touch-screen to have shortcomings such as the low and accuracy of durable, sensitivity is relatively poor.
Summary of the invention
In view of this, necessaryly provide that a kind of durability is good, accuracy is high, highly sensitive, and touch screen panel with low cost and preparation method thereof.
A kind of touch panel, this touch panel definition has two zones: a touch area and cabling zone, this touch panel comprises: a dielectric base has a surface; One adhesive-layer, this adhesive-layer are arranged at the said surface of said dielectric base; One transparency conducting layer, this transparency conducting layer comprise a carbon nanotube layer and are fixed in the surface of dielectric base through said adhesive-layer; At least one electrode, this at least one electrode is electrically connected with said transparency conducting layer; And a conducting wire, this conducting wire is connected with said at least one electrode electricity; Wherein, said adhesive-layer and transparency conducting layer only are arranged at the touch area, and said at least one electrode and conducting wire only are arranged at the surface that said dielectric base is positioned at the cabling zone.
A kind of preparation method of touch panel, it may further comprise the steps: a dielectric base is provided, and a touch area and cabling zone are set in a surface of this dielectric base; The surface that is positioned at the cabling zone in said dielectric base forms one first mask layer; The surface that is positioned at the touch area in said dielectric base forms an adhesive-layer; Form a carbon nanotube layer at said first mask layer and adhesive-layer surface; Solidify said adhesive-layer; Remove the carbon nanotube layer that is positioned at the cabling zone through removing first mask layer; And in cabling zone formation electrode and conducting wire.
A kind of preparation method of touch panel, it may further comprise the steps: a dielectric base is provided, and a surface of this dielectric base comprises a plurality of target areas, and a touch-control target area and a cabling target area are set in each target area; The surface that is positioned at the cabling target area in said dielectric base forms one first mask layer; The surface that is positioned at each touch-control target area in said dielectric base forms an adhesive-layer; Form a carbon nanotube layer at said first mask layer and adhesive-layer surface; Solidify the adhesive-layer of each touch-control target area; Remove the carbon nanotube layer that is positioned at the cabling target area through removing first mask layer, thereby obtain the transparency conducting layer that a plurality of intervals are provided with; Form electrode and conducting wire in each cabling target area; And cutting obtains a plurality of touch panels.
Compared with prior art; Touch panel that the embodiment of the invention provides and preparation method thereof 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, remove carbon nanotube layer and the adhesive-layer that is positioned at the cabling zone through the method for setting and lift off mask layer, can improve the efficient of touch panel.
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.
Fig. 3 is the stereoscan photograph of the transparency conducting layer in the touch panel of Fig. 1.
Fig. 4 prepares the process chart of touch panel for the embodiment of the invention adopts etching method.
Fig. 5 prepares the process chart of touch panel for the embodiment of the invention adopts mask means.
Fig. 6 once prepares the process chart of a plurality of touch panels for the embodiment of the invention.
Fig. 7 is the vertical view of step 1 of the process chart of Fig. 6.
Fig. 8 is the vertical view of step 2 of the process chart of Fig. 6.
Fig. 9 is the vertical view of step 3 of the process chart of Fig. 6.
Figure 10 is the vertical view of step 4 of the process chart of Fig. 6.
Figure 11 is the vertical view of step 6 of the process chart of Fig. 6.
Figure 12 is the vertical view of step 7 of the process chart of Fig. 6.
The main element symbol description
| |
10 |
| The |
10A |
| The |
10B |
| |
12 |
| The |
120 |
| The |
122 |
| The touch- |
124 |
| Adhesive- |
13 |
| Transparency conducting |
14 |
| Laser | 15 |
| Electrode | 16 |
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17 |
| The conducting |
18 |
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19 |
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.
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 adhesive-layers 13, 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 setting area of conducting wire 18 in the said touch panel 10.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.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 adhesive-layer 13 is arranged at a surface of dielectric base 12, and only is arranged at touch area 10A.Said transparency conducting layer 14 is arranged at a surface of adhesive-layer 13, and promptly said transparency conducting layer 14 also only is arranged at touch area 10A.Said electrode 16 all is arranged at the surface of dielectric base 12 with conducting wire 18, and only is arranged at cabling zone 10B.Be appreciated that; Because adhesive-layer 13 only is arranged at the surface that dielectric base 12 is positioned at touch area 10A; And electrode 16 only is arranged at the surface that dielectric base 12 is positioned at cabling zone 10B with conducting wire 18; So electrode 16 can have bigger thickness with conducting wire 18, and can not influence the surface smoothness of touch panel 10.If electrode 16 is arranged at adhesive-layer 13 surfaces with conducting wire 18,, then have following problem because the thickness of transparency conducting layer 14 can be very little.If the thickness of electrode 16 and conducting wire 18 is too little, then the electric conductivity of electrode 16 and conducting wire 18 is too poor, and fracture easily.If the thickness of electrode 16 and conducting wire 18 is too big, then the surface smoothness of touch panel 10 is too poor, and an optical clear glue-line (OCA Layer) and a cover plate (Cover Lens) are set when being unfavorable for the subsequent preparation touch-screen.And, adopt the thickness of touch-screen of this touch panel 10 also bigger.Preferably, said electrode 16 is identical with the thickness of conducting wire 18.The thickness of said adhesive-layer 13 and transparency conducting layer 14 and the thickness that equals said electrode 16 or conducting wire 18.Because transparency conducting layer 14 of the present invention only is arranged at touch area 10A; And conducting wire 18 only is arranged 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 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).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.Said conducting wire 18 comprises a plurality of leads.
The material of said electrode 16 and conducting wire 18 can be other conductive materials such as metal, electrocondution slurry or ITO, can conduct electricity with conducting wire 18 as long as guarantee this electrode 16.Said electrode 16 can pass through the etching conductive film with conducting wire 18, like metallic film or indium tin oxide films preparation, also can prepare through method methods such as serigraphys.The thickness of said electrode 16 and conducting wire 18 is 1 micron ~ 500 microns.Preferably, the thickness of said electrode 16 and conducting wire 18 is 1 micron ~ 2 microns.In the present embodiment, it is 1.5 microns the conductive paste bed of material that said electrode 16 and conducting wire 18 are thickness, and said electrode 16 is integrally formed through serigraphy electrocondution slurry (or title conductive silver paste) 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%.
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. 3, 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.In the present embodiment, said transparency conducting layer 14 is the carbon nano-tube film that a thickness is about 100 nanometers.
Said adhesive-layer 13 is transparent.The effect of said adhesive-layer 13 is in order to make said carbon nanotube layer adhere to the surface of said dielectric base 12 better.Said carbon nanotube layer is fixed in dielectric base 12 surfaces through said adhesive-layer 13, and partly is embedded in the said adhesive-layer 13, and part is exposed to outside the adhesive-layer 13.In the present embodiment, the most of CNT part surfaces in the said carbon nanotube layer are embedded in the adhesive-layer 13, and part surface is exposed to outside the adhesive-layer 13.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 micron ~ 500 microns; 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.
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; The 4th; Because adhesive-layer only is arranged at the surface that dielectric base is positioned at the touch area; And electrode and conducting wire only are arranged at the surface that dielectric base is positioned at the cabling zone; So electrode can have the thickness identical with adhesive-layer with the conducting wire, and can not influence the surface smoothness of touch panel 10.
See also Fig. 4, the embodiment of the invention 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 a touch area 10A and cabling zone 10B are set in a surface of this dielectric base 12.
In the present embodiment, said dielectric base 12 is a glass plate.
Step 2 forms an adhesive-layer 13 on the surface of said dielectric base 12.
Said adhesive-layer 13 can be formed on the whole surface of dielectric base 12 through spraying, roller coating, brushing or method of printing.In the present embodiment, the method through roller coating forms thickness on dielectric base 12 surfaces and is about 1.5 microns UV glue-line.
Step 3 forms a carbon nanotube layer 19 on said adhesive-layer 13 surfaces, and solidifies said adhesive-layer 13.
The structure of said carbon nanotube layer 19 is identical with the structure of the carbon nanotube layer of foregoing description.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.Be appreciated that through parallel no gap a plurality of carbon nano-tube films being set can be spliced into large-area carbon nanotube layer 19.
Said carbon nanotube layer 19 can partly or entirely soak in the adhesive-layer 13, and combines with adhesive-layer 13 through cohesive force.Preferably, the CNT in the said carbon nanotube layer 19 partly soaks in the adhesive-layer 13, and part is exposed to outside the adhesive-layer 13.
Further, soak in the adhesive-layer 13, can also comprise the step of this carbon nanotube layer 19 of extruding in order to make carbon nanotube layer 19.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.
The method of said curing adhesive-layer 13 is relevant with adhesive-layer 13 materials, need select according to the material of adhesive-layer 13.In the present embodiment, the method through UV-irradiation makes the UV adhesive curing.The time of said UV-irradiation is 2 seconds ~ 30 seconds.
Step 4 is removed carbon nanotube layer 19 that is positioned at cabling zone 10B and the adhesive-layer 13 that is positioned at cabling zone 10B.
Said removal is positioned at the carbon nanotube layer 19 of cabling zone 10B and the method for the adhesive-layer 13 that is positioned at cabling zone 10B can be laser ablation, particle beams etching or beamwriter lithography etc.In the present embodiment,, be positioned at the carbon nanotube layer 19 and adhesive-layer 13 of cabling zone 10B, remove the carbon nanotube layer 19 and adhesive-layer 13 that is positioned at touch area 10A thereby only keep with removal through computer control laser 15 mobile routes.Wherein, protecting touch area 10A stays the carbon nanotube layer 19 that removes as transparency conducting layer 14.
Said electrode 16 can pass through method preparations such as silk screen print method, chemical vapor deposition, magnetron sputtering with conducting wire 18.Said electrode 16 only is formed at the surface that dielectric base 12 is positioned at cabling zone 10B with conducting wire 18.Preferably, said electrode 16 is identical with the thickness of conducting wire 18, and this thickness thickness of equaling said adhesive-layer 13 and transparency conducting layer 14 with.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; Owing to can the surface smoothness of dielectric base 12 be damaged in the laser process constantly; Therefore, can also comprise before the said step 5 that one makes dielectric base 12 be positioned at the step of the flattening surface of cabling zone 10B, be beneficial to follow-up serigraphy electrocondution slurry.The step of said planarization can realize through mechanical grinding or the method that insulating gel is set.
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.Touch panel 10 provided by the invention also can be used for 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.
See also Fig. 5, the embodiment of the invention 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 a touch area 10A and cabling zone 10B are set in a surface of this dielectric base 12.
In the present embodiment, said dielectric base 12 is a PET film.
Step 2, the surface that is positioned at cabling zone 10B in said dielectric base 12 forms one first mask layer 17.
Said first mask layer 17 is a self supporting structure, and promptly this first mask layer 17 can be peeled off from dielectric base 12 surperficial one.Preferably, the material of said first mask layer 17 is a macromolecular material.Said macromolecular 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.Be appreciated that the material that forms said first mask layer 17 is not limited to the above-mentioned material of enumerating, as long as can make first mask layer 17 become self supporting structure.In the present embodiment, said first mask layer 17 is that a thickness is about 1.5 microns PET film.
Step 3 forms an adhesive-layer 13 on the surface that said dielectric base 12 is positioned at touch area 10A.
Said adhesive-layer 13 can be formed on the surface that dielectric base 12 is positioned at touch area 10A through spraying, brushing or method of printing.In the present embodiment, form the UV glue-line that a thickness is about 1.5 microns on the surface that said dielectric base 12 is positioned at touch area 10A through the method that sprays.
Be appreciated that before the touch area of said dielectric base 12 10A forms adhesive-layer 13, can form one second mask layer (figure does not show) on first mask layer, 17 surfaces earlier.And then formation adhesive-layer 13.At last, remove second mask layer.This method can guarantee that viscose glue can not be retained in first mask layer, 17 surfaces.Said second mask layer is identical with the structure and material of first mask layer 17.Preferably, said second mask layer is identical with the size and the shape of first mask layer 17, and the thickness of said second mask layer is less than the thickness of first mask layer 17.
Step 4 forms a carbon nanotube layer 19 on said first mask layer 17 and 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 first mask layer 17 and adhesive-layer 13 surfaces.
The said carbon nanotube layer 19 that is arranged in adhesive-layer 13 surfaces can partly soak into adhesive-layer 13, and combines with adhesive-layer 13 through cohesive force.Preferably, the CNT in the said carbon nanotube layer 19 partly soaks in the adhesive-layer 13, and part is exposed to outside the adhesive-layer 13.And the carbon nanotube layer 19 that is positioned at first mask layer, 17 surfaces combines with first mask layer 17 through Van der Waals force.
Step 5 is solidified said adhesive-layer 13.
The method of said curing adhesive-layer 13 is relevant with adhesive-layer 13 materials, need select according to the material of adhesive-layer 13.Because carbon nanotube layer 19 soaks in the adhesive-layer 13, so the carbon nanotube layer 19 on adhesive-layer 13 surfaces can be fixed in the process that adhesive-layer 13 solidifies in this step.In the present embodiment, the method through UV-irradiation makes the UV adhesive curing.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 6 is removed the carbon nanotube layer 19 that is positioned at cabling zone 10B through removing first mask layer 17, thereby is obtained a transparency conducting layer 14.
Because said first mask layer 17 is a self supporting structure, can peel off from dielectric base 12 surperficial one, so in this step, can be directly with whole first mask layer 17 from dielectric base 12 sur-face peelings.Combine with first mask layer 17 through Van der Waals force owing to be positioned at the carbon nanotube layer 19 of cabling zone 10B, so this part carbon nanotube layer 19 is along with first mask layer 17 is removed together.The carbon nanotube layer 19 that is positioned at touch area 10A then is fixed on dielectric base 12 surfaces by adhesive-layer 13 and forms transparency conducting layer 14.Remove the efficient that the carbon nanotube layer 19 that is positioned at cabling zone 10B can improve touch panel 10 through the method for peeling off first mask layer 17.And first mask layer of peeling off 17 can be reused, thereby reduces the cost of preparation touch panel 10.
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.
See also Fig. 6, the embodiment of the invention further provides a kind of method that once prepares a plurality of touch panels 10, and it may further comprise the steps:
Step 1 provides a dielectric base 12, and a surface of this dielectric base 12 comprises a plurality of target areas 120, and a touch-control target area 124 and a cabling target area 122 are set in each target area 120.
Please further consult Fig. 7, the shape of said a plurality of target areas 120 and size can be selected according to actual needs.Said touch-control target area 124 for said dielectric base 12 surfaces with the corresponding zone of touch area 10A of the touch panel 10 that will prepare.The corresponding zone of the regional 10B of cabling of the touch panel 10 that said cabling target area 122 will prepare for said dielectric base 12 surfaces and institute.In the present embodiment, said dielectric base 12 is the structure of a plane, and this dielectric base 12 is flexible material PET.Present embodiment is divided into dielectric base 12 the identical target area 120 of 9 parts of sizes of 3 row, 3 row.Said touch-control target area 124 is the central area of target area 120, and said cabling target area 122 is around touch-control target area 124.The shape of said touch-control target area 124 and area identical with the shape of target area 120 is less than the area of target area 120, and said cabling target area 122 is other zone beyond the touch-control target area 124.
Step 2 forms one first mask layer 17 on the surface that said dielectric base 12 is positioned at cabling target area 122.
Please further consult Fig. 8, in the present embodiment, said first mask layer 17 all covers the cabling target area 122 of dielectric base 12.Said first mask layer 17 is that a thickness is about 1.5 microns PET film.
Step 3 forms an adhesive-layer 13 on the surface that said dielectric base 12 is positioned at each touch-control target area 124.
Please further consult Fig. 9, said adhesive-layer 13 can be formed on the surface that dielectric base 12 is positioned at touch-control target area 124 through spraying, brushing or method of printing.In the present embodiment, form thickness through the method for brushing and be about 1.5 microns UV glue-line.Be appreciated that before forming adhesive-layer 13, can form one second mask layers on first mask layer, 17 surfaces earlier, wait and remove second mask layer again after forming adhesive-layer 13, to guarantee that first mask layer, 17 surfaces do not have viscose glue and keep.
Step 4 forms a carbon nanotube layer 19 on said first mask layer 17 and adhesive-layer 13 surfaces.
Please further consult Figure 10, said carbon nanotube layer 19 is with whole first mask layer 17 and adhesive-layer 13 surface coverage.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 first mask layer 17 and adhesive-layer 13 surfaces.Be appreciated that owing to, once prepare a plurality of touch panels 10, so the width of the single carbon nano-tube film of from carbon nano pipe array, pulling out maybe be less than the width of dielectric base 12 through big plate processing procedure.Therefore, also can the parallel no gap of a plurality of carbon nano-tube films be provided with to be combined into a carbon nanotube layer 19 that area is bigger.Preferably, the splicing line of adjacent two carbon nano-tube films is overlapped with the middle cut line of adjacent two row or two row target areas 120.
Step 5 is solidified the adhesive-layer 13 of each touch-control target area 124.
In the present embodiment, the method through UV-irradiation makes the UV adhesive curing.The time of said UV-irradiation is 2 seconds ~ 30 seconds.In this step, the carbon nanotube layer 19 that is positioned at touch-control target area 124 is fixing by adhesive-layer 13.
Step 6 is removed the carbon nanotube layer 19 that is positioned at cabling target area 122 through removing first mask layer 17, thereby obtains the transparency conducting layer 14 that a plurality of intervals are provided with.
Because said first mask layer 17 is a self supporting structure, so in this step, can directly whole first mask layer 17 be peeled off from dielectric base 12 surperficial one.Please further consult Figure 11, a plurality of transparency conducting layers 14 are arranged at intervals at the touch-control target area 124 on dielectric base 12 surfaces.
Step 7 forms electrode 16 and conducting wire 18 in each cabling target area 122.
Please further consult Figure 12, 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, all electrodes 16 once form through the serigraphy electrocondution slurry with conducting wire 18, and the electrode 16 of same cabling target area 122 is integrally formed with conducting wire 18.
Step 8, cutting obtains a plurality of touch panels 10.
Said cutting obtains the step of a plurality of touch panels 10 can pass through methods realizations such as cut, machine cuts.In the present embodiment, through machine cuts each target area 120 of dielectric base 12 is separated, thereby obtain a plurality of touch panels 10.Particularly; Cut said dielectric base 12 along the middle cut line of two row or two row target areas 120 perpendicular to dielectric base 12 thickness directions earlier; 120 middle lines of cut cut said dielectric base 12 perpendicular to dielectric base 12 thickness directions along two adjacent target areas again, so can obtain a plurality of touch panels 10.
The touch-screen that the embodiment of the invention provides has the following advantages: the first, because carbon nanotube layer is simpler than the preparation technology of ITO layer, thereby reduced preparation cost.The second, remove the carbon nanotube layer and the adhesive-layer that are positioned at the cabling zone, make the electrode that is formed at the cabling zone can have the thickness identical, and can not influence the surface smoothness of touch panel with adhesive-layer with the conducting wire.The 3rd, remove carbon nanotube layer and the adhesive-layer that is positioned at the cabling zone through the method for setting and lift off mask layer, can improve the efficient of touch panel.The 4th, through big plate processing procedure, once prepare a plurality of touch panels, simplified technological process, improved preparation efficiency, reduced preparation cost.
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 (15)
1. touch panel, this touch panel definition has two zones: a touch area is regional with a cabling, and this touch panel comprises:
One dielectric base has a surface;
One adhesive-layer, this adhesive-layer are arranged at the said surface of said dielectric base;
One transparency conducting layer, this transparency conducting layer comprise a carbon nanotube layer and are fixed in the surface of dielectric base through said adhesive-layer;
At least one electrode, this at least one electrode is electrically connected with said transparency conducting layer; And
One conducting wire, this conducting wire is connected with said at least one electrode electricity;
It is characterized in that said adhesive-layer and transparency conducting layer only are arranged at the touch area, said at least one electrode and conducting wire only are arranged at the surface that said dielectric base is positioned at the cabling zone.
2. touch panel as claimed in claim 1 is characterized in that, the thickness of said at least one electrode and conducting wire is identical, and this thickness thickness of equaling said adhesive-layer and transparency conducting layer with.
3. touch panel as claimed in claim 1 is characterized in that said carbon nanotube layer is made up of some CNTs, and these some CNTs extend along a fixed-direction preferred orientation.
4. touch panel as claimed in claim 3 is characterized in that, the most of CNT part surfaces in the said carbon nanotube layer are embedded in the adhesive-layer, and part surface is exposed to outside the adhesive-layer.
5. touch panel as claimed in claim 1 is characterized in that, the material of said at least one electrode and conducting wire is metal, electrocondution slurry or ITO.
6. touch panel as claimed in claim 1 is characterized in that, the material of said adhesive-layer is thermoplastic or UV glue.
7. the preparation method of a touch panel, it may further comprise the steps:
One dielectric base is provided, and a touch area and cabling zone are set in a surface of this dielectric base;
The surface that is positioned at the cabling zone in said dielectric base forms one first mask layer;
The surface that is positioned at the touch area in said dielectric base forms an adhesive-layer;
Form a carbon nanotube layer at said first mask layer and adhesive-layer surface;
Solidify said adhesive-layer;
Remove the carbon nanotube layer that is positioned at the cabling zone through removing first mask layer; And
Form electrode and conducting wire in the cabling zone.
8. the preparation method of touch panel as claimed in claim 7 is characterized in that, said first mask layer is a self supporting structure, and the material of said first mask layer is a macromolecular material.
9. the preparation method of touch panel as claimed in claim 7 is characterized in that, the method for said formation carbon nanotube layer is print process, sedimentation or direct method of laying.
10. the preparation method of touch panel as claimed in claim 7 is characterized in that, behind the said formation carbon nanotube layer, the CNT that is arranged in the carbon nanotube layer on adhesive-layer surface partly soaks into adhesive-layer, and part is exposed to outside the adhesive-layer.
11. the preparation method of touch panel as claimed in claim 7 is characterized in that, said adhesive-layer is the UV glue-line, and the method for said curing adhesive-layer is a UV-irradiation.
12. the preparation method of touch panel as claimed in claim 7 is characterized in that, said electrode and conducting wire are integrally formed through the serigraphy electrocondution slurry, and said electrode and conducting wire directly are formed at the surface that dielectric base is positioned at the cabling zone.
13. the preparation method of touch panel as claimed in claim 12 is characterized in that, the thickness of said electrode and conducting wire is identical, and the thickness of electrode and the conducting wire thickness that equals said adhesive-layer and carbon nanotube layer with.
14. the preparation method of a touch panel, it may further comprise the steps:
One dielectric base is provided, and a surface of this dielectric base comprises a plurality of target areas, and a touch-control target area and a cabling target area are set in each target area;
The surface that is positioned at the cabling target area in said dielectric base forms one first mask layer;
The surface that is positioned at each touch-control target area in said dielectric base forms an adhesive-layer;
Form a carbon nanotube layer at said first mask layer and adhesive-layer surface;
Solidify the adhesive-layer of each touch-control target area;
Remove the carbon nanotube layer that is positioned at the cabling target area through removing first mask layer, thereby obtain the transparency conducting layer that a plurality of intervals are provided with;
Form electrode and conducting wire in each cabling target area; And
Cutting obtains a plurality of touch panels.
15. the preparation method of touch panel as claimed in claim 14 is characterized in that, the method that said cutting obtains a plurality of touch panels is laser cutting method or machine cuts method.
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| CN2011101540709A CN102819338A (en) | 2011-06-09 | 2011-06-09 | Production method of touch panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101540709A CN102819338A (en) | 2011-06-09 | 2011-06-09 | Production method of touch panel |
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| CN108089778A (en) * | 2013-09-02 | 2018-05-29 | 安溪钟泰专利技术转移有限公司 | A kind of touch-screen |
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Application publication date: 20121212 |