CN102819341B - The preparation method of touch panel - Google Patents
The preparation method of touch panel Download PDFInfo
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- CN102819341B CN102819341B CN201110154076.6A CN201110154076A CN102819341B CN 102819341 B CN102819341 B CN 102819341B CN 201110154076 A CN201110154076 A CN 201110154076A CN 102819341 B CN102819341 B CN 102819341B
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Abstract
The present invention relates to a kind of preparation method of touch panel, the method comprises the following steps: provide a dielectric base, and one of this dielectric base defines two regions on the surface: a touch area and a routing region; An adhesive-layer is formed on the surface of described dielectric base; Solidification is positioned at the adhesive-layer of described routing region; A carbon nanotube layer is formed on adhesive-layer surface; Solidification is positioned at the adhesive-layer of described touch area, to be fixed by the carbon nanotube layer being positioned at touch area; Remove the carbon nanotube layer being positioned at routing region and obtain a transparency conducting layer; And form electrode and conducting wire.
Description
Technical field
The present invention relates to a kind of preparation method of touch panel, particularly relate to a kind of preparation method of the touch panel based on carbon nano-tube.
Background technology
In recent years, along with high performance and the diversified development of the various electronic equipments such as mobile phone and touch navigation system, the electronic equipment installing the touch-screen of light transmission before the display devices such as liquid crystal progressively increases.The user of such electronic equipment, by touch-screen, carries out visual confirmation to the displaying contents of the display device being positioned at the touch-screen back side, while utilize the pressing touch-screens such as finger or pointer to operate.Thus, can the various functions of operating electronic equipment.
According to the principle of work of touch-screen and the difference of 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 comparison of capacitive touch screen and resistive touch screen is 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).But ITO layer adopts the technique such as ion beam sputtering or evaporation to prepare as transparency conducting layer usually, in the process of preparation, need higher vacuum environment and need to be heated to 200 DEG C ~ 300 DEG C, therefore, making the preparation cost of ITO layer higher.In addition, the method removing part ITO layer is generally laser ablation, and the 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 efficiency.
A preparation method for touch panel, the method comprises the following steps: provide a dielectric base, and one of this dielectric base defines two regions on the surface: a touch area and a routing region; An adhesive-layer is formed on the surface of described dielectric base; Solidification is positioned at the adhesive-layer of described routing region; A carbon nanotube layer is formed on adhesive-layer surface; Solidification is positioned at the adhesive-layer of described touch area, to be fixed by the carbon nanotube layer being positioned at touch area; Remove the carbon nanotube layer being positioned at routing region and obtain a transparency conducting layer; And form electrode and conducting wire.
A preparation method for touch panel, the method comprises the following steps: provide a dielectric base, and one of this dielectric base defines two regions on the surface: a touch area and a routing region; An adhesive-layer is formed on the surface of described dielectric base; Solidification is positioned at the adhesive-layer of described routing region; A carbon nanotube layer is formed on adhesive-layer surface; Solidification is positioned at the adhesive-layer of described touch area, to be fixed by the carbon nanotube layer being positioned at touch area; Form electrode and conducting wire; And remove the carbon nanotube layer being positioned at routing region and obtain a transparency conducting layer.
Compared with prior art, the touch-screen that the embodiment of the present invention provides has the following advantages: because the present embodiment first makes the adhesive-layer solidification being positioned at routing region, rear formation carbon nanotube layer, so greatly reduce the difficulty of the carbon nanotube layer removing routing region, thus reduce preparation cost, improve preparation efficiency.
Accompanying drawing explanation
The vertical view of the touch panel that Fig. 1 provides for the embodiment of the present invention.
Fig. 2 is the sectional view of the touch panel II-II along the line of Fig. 1.
The routing region of the touch panel that Fig. 3 to Fig. 6 provides for the embodiment of the present 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 present invention.
The STRUCTURE DECOMPOSITION figure of the touch-screen that Fig. 9 provides for the embodiment of the present 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 the merging schematic diagram of the first transparency conducting layer in Figure 11 and the second transparency conducting layer.
Main element symbol description
| Touch panel | 10 |
| Touch area | 10A, 20A |
| Routing region | 10B, 20B |
| Dielectric base | 12 |
| Adhesive-layer | 13 |
| Transparency conducting layer | 14 |
| Mask | 15 |
| Electrode | 16 |
| Conducting wire | 18 |
| Carbon nanotube layer | 19 |
| Touch-screen | 20 |
| Second dielectric base | 220 |
| First conducting wire | 221 |
| First transparency conducting layer | 222 |
| First electrode | 223 |
| Second transparency conducting layer | 224 |
| Second electrode | 225 |
| First dielectric base | 226 |
| Second conducting wire | 227 |
| 3rd dielectric base | 228 |
| Sensing circuit | 22 |
| Driving circuit | 24 |
| Controller | 26 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments, touch panel provided by the invention and preparation method thereof is described in further detail.First the embodiment of the present invention provides a kind of touch panel.
Refer to Fig. 1 and Fig. 2, the embodiment of the present invention provides a kind of touch panel 10, and this touch panel 10 comprises dielectric base 12, transparency conducting layer 14, at least one electrode 16 and a conducting wire 18.
Described touch panel 10 definition has two regions: an a touch area 10A and routing region 10B.Described touch area 10A is the region that described touch panel 10 touchedly can realize touch controllable function, and described routing region 10B is the region that in described touch panel 10, conducting wire and electrode are arranged.Described routing region 10B is the submarginal region compared with small size of touch panel 10, and it can be positioned at least side of touch area 10A.Described touch area 10A is the region of the larger area comprising touch panel 10 central area.Described routing region 10B is usually located at the periphery of described touch area 10A.The position relationship of described touch area 10A and routing region 10B is not limit, and can select as required.Below provide when described touch panel 10 is for rectangle, several position relationships of touch area 10A and routing region 10B.
As shown in Figure 1, described routing region 10B can be the annular region near touch panel 10 edge, described touch area 10A be routing region 10B around region; As shown in Figure 3, described routing region 10B can be the strip region near touch panel 10, and described touch area 10A is the region beyond the 10B of routing region; As shown in Figure 4, described routing region 10B can be that described touch area 10A is the region between the 10B of routing region respectively near the parallel strip region on the relative both sides of touch panel 10; As shown in Figure 5, described routing region 10B can be the L shape strip region near the adjacent both sides of touch panel 10, and described touch area 10A is the region beyond the 10B of routing region; As shown in Figure 6, described routing region 10B can be the U-shaped strip region near three adjacent limits of touch panel 10, and described touch area 10A is the region beyond the 10B of routing region.In the present embodiment, described touch area 10A is the central area of touch panel 10, and described routing region 10B is around touch area 10A.The shape of described touch area 10A and area identical with the shape of touch panel 10 is less than the area of touch panel 10, and described routing region 10B is other region beyond the 10A of touch area.
Described transparency conducting layer 14, electrode 16 and conducting wire 18 are arranged at a surface of dielectric base 12 respectively.Wherein, described transparency conducting layer 14 is only arranged at the surface that dielectric base 12 is positioned at touch area 10A.Described conducting wire 18 is only arranged at the surface that dielectric base 12 is positioned at routing region 10B.Described electrode 16 is arranged at least one side of described transparency conducting layer 14, and is electrically connected respectively with conducting wire 18 and transparency conducting layer 14.This transparency conducting layer 14 is electrically connected with an external circuits (not shown) by described conducting wire 18.Because transparency conducting layer 14 of the present invention is only arranged at the surface that dielectric base 12 is positioned at touch area 10A, and conducting wire 18 is only arranged at the surface that dielectric base 12 is positioned at routing region 10B, namely, transparency conducting layer 14 and conducting wire 18 do not have overlapping part, so when pointer or finger touch routing region 10B, capacitance interference signal can not be produced between conducting wire 18 and transparency conducting layer 14, thus further increase the accuracy of touch-screen.
Described 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 the hard materials such as glass, quartz, adamas or plastics or flexible material.Particularly, described flexible material may be selected to be the polyester materials such as polycarbonate (PC), polymethylmethacrylate (PMMA), tygon (PE), polyimide (PI) or polyethylene terephthalate (PET), or the material such as polyethersulfone (PES), cellulose esters, Polyvinylchloride (PVC), benzocyclobutene (BCB) or acryl resin.In the present embodiment, described dielectric base 12 is the structure of a plane, and this dielectric base 12 is flexible polycarbonate (PC).Be appreciated that the material forming described dielectric base 12 is not limited to the above-mentioned material enumerated, as long as dielectric base 12 can be made to play the effect of support, and there is suitable transparency.
Described transparency conducting layer 14 comprises a carbon nanotube layer.Described carbon nanotube layer is made up of some carbon nano-tube, and in this carbon nanotube layer, the bearing of trend of most of carbon nano-tube is basically parallel to the surface of this carbon nanotube layer.The thickness of described carbon nanotube layer is not limit, and can select as required; The thickness of described carbon nanotube layer is 0.5 nanometer ~ 100 micron; Preferably, the thickness of this carbon nanotube layer is 100 nanometer ~ 200 nanometers.Distribute due to the even carbon nanotube in described carbon nanotube layer and there is good pliability, making this carbon nanotube layer have good pliability, arbitrary shape can be become and not easily break by bending fold.In the present embodiment, described transparency conducting layer 14 is only a carbon nanotube layer.
Carbon nano-tube in described carbon nanotube layer comprise in Single Walled Carbon Nanotube, double-walled carbon nano-tube and multi-walled carbon nano-tubes one or more.The diameter of described Single Walled Carbon Nanotube is 0.5 nanometer ~ 50 nanometer, and the diameter of double-walled carbon nano-tube is 1.0 nanometer ~ 50 nanometers, and the diameter of multi-walled carbon nano-tubes is 1.5 nanometer ~ 50 nanometers.The length of described carbon nano-tube is greater than 50 microns.Preferably, the length of this carbon nano-tube is preferably 200 microns ~ 900 microns.
Unordered or the ordered arrangement of carbon nano-tube in described carbon nanotube layer.So-called lack of alignment refers to that the orientation of carbon nano-tube is random.So-called ordered arrangement refers to that the orientation of carbon nano-tube is regular.Particularly, when carbon nanotube layer comprises the carbon nano-tube of lack of alignment, carbon nano-tube is wound around or isotropy arrangement mutually; When carbon nanotube layer comprises the carbon nano-tube of ordered arrangement, carbon nano-tube is arranged of preferred orient along a direction or multiple directions.So-called " preferred orientation " refers to that the most of carbon nano-tube in described carbon nanotube layer have larger orientation probability on a direction or several direction; That is, the most of carbon nano-tube in this carbon nanotube layer axially substantially in the same direction or several direction extend.Between adjacent carbon nano-tube among described carbon nanotube layer, there is gap, thus in carbon nanotube layer, form multiple gap.
Described carbon nanotube layer comprises at least one carbon nano-tube film.When described carbon nanotube layer comprises multiple carbon nano-tube film, this carbon nano-tube film can the coplanar setting of substantially parallel gapless or stacked setting.Refer to Fig. 7, the self supporting structure that described carbon nano-tube film is made up of some carbon nano-tube.Described some carbon nano-tube are arranged of preferred orient in the same direction.In this carbon nano-tube film, the overall bearing of trend of most of carbon nano-tube substantially in the same direction.And the overall bearing of trend of described most of carbon nano-tube is basically parallel to the surface of carbon nano-tube film.Further, in described carbon nano-tube film, most carbon nano-tube is joined end to end by Van der Waals (VanDerWaals) power.Particularly, in the most of carbon nano-tube extended substantially in the same direction in described carbon nano-tube film, each carbon nano-tube and carbon nano-tube adjacent are in the direction of extension joined end to end by Van der Waals force.Certainly, there is the carbon nano-tube of minority random alignment in described carbon nano-tube film, these carbon nano-tube can not form obviously impact to the overall orientation arrangement of carbon nano-tube most of in carbon nano-tube film.Described carbon nano-tube film does not need large-area carrier supported, as long as and relatively both sides provide support power can be unsettled on the whole and keep self membranaceous state, when being placed on (or being fixed on) spaced two supporters by this carbon nano-tube film, the carbon nano-tube film between two supporters can the membranaceous state of unsettled maintenance self.
Particularly, the most carbon nano-tube extended substantially in the same direction in described carbon nano-tube film, and nisi linearity, can be suitable bend; Or and non-fully arranges according on bearing of trend, can be suitable depart from bearing of trend.Therefore, can not get rid of between carbon nano-tube arranged side by side in the most carbon nano-tube extended substantially in the same direction of carbon nano-tube film and may there is part contact.
Particularly, described carbon nano-tube film comprise multiple continuously and the carbon nano-tube fragment aligned.The plurality of carbon nano-tube fragment is joined end to end by Van der Waals force.Each carbon nano-tube fragment comprises multiple carbon nano-tube be parallel to each other, and the plurality of carbon nano-tube be parallel to each other is combined closely by Van der Waals force.This carbon nano-tube fragment has arbitrary length, thickness, homogeneity and shape.Carbon nano-tube in this carbon nano-tube film is arranged of preferred orient in the same direction.
Described carbon nano-tube film obtains by directly pulling from carbon nano pipe array.Be appreciated that by by parallel for multiple carbon nano-tube film and the coplanar laying of gapless or/and stacked laying, the carbon nanotube layer of different area and thickness can be prepared.The thickness of each carbon nano-tube film can be 0.5 nanometer ~ 100 micron.When carbon nanotube layer comprises the carbon nano-tube film of multiple stacked setting, the orientation shape of the carbon nano-tube in adjacent carbon nano-tube film has angle α, 0≤α≤90.
Described carbon nano-tube film obtains by directly pulling from carbon nano pipe array.Particularly, first on the substrate of quartz or wafer or other material, grow carbon nano pipe array, such as, use long-pending (ChemicalVaporDeposition, the CVD) method in chemical gaseous phase Shen; Then, with stretching technique, carbon nano-tube pulled out one by one from carbon nano pipe array and formed.These carbon nano-tube are joined end to end by Van der Waals force, form tool certain orientation and the conductive elongate structure of almost parallel arrangement.The minimum electrical impedance of direction tool that the carbon nano-tube film formed can stretch, and perpendicular to the maximum electrical impedance of draw direction tool, thus possess electrical impedance anisotropy.
Described carbon nano-tube film directly can be layed in the surface of dielectric base 12, also can be fixed on described dielectric base 12 surface by an adhesive-layer 13.The effect of described adhesive-layer 13 is the surfaces in order to make described carbon nano-tube film adhere to described dielectric base 12 better.Described adhesive-layer 13 is transparent, and the material of this adhesive-layer 13 is thermoplastic or the UV(UltravioletRays with low melting point) glue, as PVC or PMMA etc.The thickness of described adhesive-layer 13 is 1 nanometer ~ 500 micron; Preferably, the thickness of described adhesive-layer 13 is 1 micron ~ 2 microns.In the present embodiment, the material of described adhesive-layer 13 is UV glue, and the thickness of this adhesive-layer 13 is about 1.5 microns.
Described electrode 16 can be arranged at the surface that dielectric base 12 is positioned at routing region 10B, also the surface that dielectric base 12 is positioned at touch area 10A can be arranged at, partly can also be arranged at the surface that dielectric base 12 is positioned at routing region 10B, part is arranged at the surface that dielectric base 12 is positioned at touch area 10A.The setting position of described electrode 16 is relevant with touch point detection method with the touch-control principle of the touch-screen adopting this touch panel 10, the number of described electrode 16 is relevant with touch-control resolution with the area of this touch panel 10, can select according to practical application situation.When the area of touch panel 10 is larger, when resolution requirement is higher, the number of described electrode 16 is more.Vice versa.In the present embodiment, described touch panel 10 comprises six electrodes 16, and these six electrodes 16 are arranged at intervals at transparency conducting layer 14 side.The material of described electrode 16 is other conductive materials such as metal, carbon nano-tube, electrocondution slurry or ITO, as long as guarantee that this electrode 16 can conduct electricity.Described electrode 16 can pass through etching conductive film, as metallic film or indium tin oxide films preparation, also can be prepared by silk screen print method.
Described conducting wire 18 comprises multiple wire, and its material can be other conductive materials such as metal, carbon nano-tube, electrocondution slurry or ITO.Etching conductive film can be passed through in described conducting wire 18, as metallic film or indium tin oxide films preparation, also can be prepared by silk screen print method.In the present embodiment, described electrode 16 and conducting wire 18 are conductive silver slurry, and this electrode 16 and conducting wire 18 are formed by silk screen print method simultaneously.
Refer to Fig. 8, the embodiment of the present invention provides a kind of preparation method of touch panel 10 further, and it comprises the following steps:
Step one, provides a dielectric base 12, and forms an adhesive-layer 13 on a surface of this dielectric base 12.Wherein, the touch area 10A of the touch panel 10 on the described surface of described dielectric base 12 according to above-mentioned Fig. 3 to Fig. 6 and routing region 10B definition has touch area 10A and routing region 10B.
The material of described adhesive-layer 13 is not limit, as long as can realize under a certain condition local solidification viscose glue can, as thermoplastic, hot-setting adhesive or UV glue etc.The method of described formation one adhesive-layer 13 can be spin-coating method, spraying process, brushing etc.In the present embodiment, described dielectric base 12 is a PET film.Described adhesive-layer 13 is the UV glue-line that a thickness is about 1.5 microns, and it is formed at PET film one surface by the method for coating.
Step 2, solidification is positioned at the adhesive-layer 13 of routing region 10B.
The method that described solidification is positioned at the adhesive-layer 13 of routing region 10B is relevant with the material of adhesive-layer 13.Described thermoplastic can be solidified by Local cooling, and described hot-setting adhesive can be solidified by spot heating, and described UV glue can by local ultraviolet lighting solidification.
In the present embodiment, the method that described solidification is positioned at the adhesive-layer 13 of routing region 10B comprises the following steps:
First, by a mask 15, the UV glue-line being positioned at touch area 10A is blocked;
Secondly, UV-irradiation is adopted to be positioned at the UV glue-line of routing region 10B, to make the UV curable adhesive layer being positioned at routing region 10B;
Then, mask 15 is removed.
Described mask 15 is unsettled is arranged at the surface of described adhesive-layer 13 away from dielectric base 12.The time of described UV-irradiation is 2 seconds ~ 30 seconds.In the present embodiment, the time of described UV-irradiation is 4 seconds.
Step 3, forms a carbon nanotube layer 19 on adhesive-layer 13 surface.
Described carbon nanotube layer 19 can be formed at adhesive-layer 13 surface by methods such as printing, deposition or direct layings.In the present embodiment, described carbon nanotube layer 19 is a carbon nano-tube film with self-supporting effect, and it directly can be layed in whole adhesive-layer 13 surface.After carbon nanotube layer 19 is formed at adhesive-layer 13 surface, the part being positioned at routing region 10B due to adhesive-layer 13 has cured, so the carbon nanotube layer 19 being positioned at routing region 10B is only formed at adhesive-layer 13 surface, and be combined with the adhesive-layer 13 of solidification by Van der Waals force.Therefore, the carbon nanotube layer 19 being positioned at routing region 10B described in is fainter with the adhesion of adhesive-layer 13.The part being positioned at touch area 10A due to adhesive-layer 13 is not yet solidified, so the carbon nanotube layer 19 being arranged in touch area 10A can partly or entirely infiltrate adhesive-layer 13, and is combined with adhesive-layer 13 by cohesive force.Therefore, the carbon nanotube layer 19 being positioned at touch area 10A described in is more firm with the adhesion of adhesive-layer 13.Preferably, described in be arranged in the carbon nanotube layer 19 of touch area 10A carbon nanotube portion infiltrate adhesive-layer 13, part is exposed to outside adhesive-layer 13.
Further, in order to make the carbon nanotube layer 19 being arranged in touch area 10A infiltrate adhesive-layer 13, the step of this carbon nanotube layer 19 of an extruding can also be comprised.In the present embodiment, a PET film is adopted to be layed in carbon nanotube layer 19 surface, this carbon nanotube layer 19 of extruding gently.
Step 4, solidification is positioned at the adhesive-layer 13 of touch area 10A, to be fixed by the carbon nanotube layer 19 being positioned at touch area 10A.
The Methods and steps two that described solidification is positioned at the adhesive-layer 13 of touch area 10A is identical, needs the Material selec-tion according to adhesive-layer 13.The actual uncured portion for adhesive-layer 13 being positioned at touch area 10A of step that described solidification is positioned at the adhesive-layer 13 of touch area 10A is cured.Because the carbon nanotube layer 19 being arranged in touch area 10A infiltrates adhesive-layer 13, so the process that the carbon nanotube layer 19 being arranged in touch area 10A in this step can solidify at adhesive-layer 13 is fixed.And the adhesive-layer 13 being positioned at routing region 10B has cured, so the carbon nanotube layer 19 being positioned at routing region 10B can not be fixed by adhesive-layer 13.In the present embodiment, make by the method for UV-irradiation the UV adhesive curing being positioned at touch area 10A.
Step 5, removes the carbon nanotube layer 19 being positioned at routing region 10B and obtains a transparency conducting layer 14.
The method that described removal is positioned at the carbon nanotube layer 19 of routing region 10B can be peeled off for being bondd by adhesive tape or be peeled off by cleaning roller.Described cleaning roller surface has certain viscosity, carbon nanotube layer 19 can be clung and peel off.Because the carbon nanotube layer 19 being positioned at routing region 10B is combined with adhesive-layer 13 by means of only Van der Waals force, more weak with adhesive-layer 13 surface conjunction power, thus bondd by adhesive tape or cleaning roller roll can easily the carbon nanotube layer 19 of this routing region 10B be removed.In the present embodiment, the carbon nanotube layer 19 being positioned at routing region 10B is removed by the method bondd by adhesive tape.Because the present embodiment first makes the adhesive-layer 13 being positioned at routing region 10B solidify, rear formation carbon nanotube layer 19, so the difficulty greatly reducing the carbon nanotube layer 19 removing routing region 10B.Certainly, remove the carbon nanotube layer 19 being positioned at routing region 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.
The method preparations such as silk screen print method, chemical vapor deposition, magnetron sputtering can be passed through in described electrode 16 and conducting wire 18.In the present embodiment, described electrode 16 and conducting wire 18 are integrally formed by Screen-printed conductive slurry.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 the order of step 5 in the present embodiment and step 6 can be exchanged, namely first form electrode 16 and conducting wire 18, and then remove the carbon nanotube layer 19 being positioned at routing region 10B.In the method, conducting wire 18 is formed at carbon nanotube layer 19 surface being positioned at routing region 10B.Owing to first forming electrode 16 and conducting wire 18, in this way in remove the method being positioned at the carbon nanotube layer 19 of routing region 10B and be preferably laser ablation, particle beams etching or beamwriter lithography etc.Owing to first forming electrode 16 and conducting wire 18, and then remove and be positioned at the carbon nanotube layer 19 of routing region 10B, the electrode 16 of the touch panel 10 prepared in this way and remain part carbon nano-tube between conducting wire 18 and adhesive-layer 13.Contraposition mask (mark) required when being appreciated that the conducting wire 18 of described serigraphy can be used as laser ablation.
Be appreciated that, an optical clear glue-line (OCALayer) and a cover plate (CoverLens) are set by the surface of the touch panel 10 prepared at the present embodiment, thus cover above-mentioned transparency conducting layer 14, electrode 16 and conducting wire 18 and can obtain a touch-screen.
The present invention further provides a kind of touch-screen adopting the touch panel of said structure.Touch panel provided by the invention is applicable to the touch-screen of the various employing structure of transparent conductive layer such as condenser type single-point touch-screen, capacitive multi-point touch screen, resistance-type single-point touch-screen, resistance-type multi touch screen.The embodiment of the present invention is only specifically described for capacitive multi-point touch screen.
Refer to Fig. 9 and Figure 10, the embodiment of the present invention provides a kind of capacitive touch screen 20, and this touch-screen 20 comprises one first dielectric base 226,1 second dielectric base 220,1 first transparency conducting layer 222,1 second transparency conducting layer 224, multiple first electrode 223, multiple second conducting wire, electrode 225,1 first conducting wire 221,1 second 227 and one the 3rd dielectric base 228.
Described touch-screen 20 definition has two regions: an a touch area 20A and routing region 20B.In the present embodiment, described touch-screen 20 is a rectangle, and described routing region 20B is the edge L shape strip region of described touch-screen 20 near adjacent both sides, and described touch area 20A is other region beyond the 20B of routing region.
Described first dielectric base 226, second transparency conducting layer 224, second dielectric base 220, first transparency conducting layer 222 and the 3rd dielectric base 228 are from bottom to top 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 touching surface, D score refers to the direction of touch-screen 20 away from touching surface.Described second transparency conducting layer 224 is compared with the touching surface of the first transparency conducting layer 222 away from touch-screen 20.Described first transparency conducting layer 222 and the second transparency conducting layer 224 are arranged at two relative surfaces of the second dielectric base 220 respectively.Described first dielectric base 226 is arranged at described second transparency conducting layer 224 lower surface, and is covered by the second transparency conducting layer 224.Described 3rd dielectric base 228 is arranged at described first transparency conducting layer 222 upper surface, and is covered by described first transparency conducting layer 222.Consult Figure 11 and Figure 12 further, described multiple first electrode 223 interval arranges and is electrically connected with described first transparency conducting layer 222.Described multiple second electrode 225 interval arranges and is electrically connected with described second transparency conducting layer 224.Multiple first electrode 223 is sensed (Sensing) circuit 22 with one and is electrically connected by described first conducting wire 221.Multiple second electrode 225 drives (Driving) circuit 24 to be electrically connected with one by described second conducting wire 227.But, according to the demand of various function, between above-mentioned each layer, other extra layer also can be inserted.
Described first transparency conducting layer 222 and the second transparency conducting layer 224 are only arranged at the surface that the second dielectric base 220 is positioned at touch area 20A.Described first transparency conducting layer 222 and the second transparency conducting layer 224 are the conducting film of tool electrical impedance anisotropy, such as carbon nano-tube film or through etching or the carbon nano-tube film of lasser cutting.When carbon nano-tube film through lasser cutting, carbon nano-tube film will have plural laser cut line, and such process can't affect the electrical impedance anisotropy that carbon nano-tube film originally just had.In the present embodiment, the first transparency conducting layer 222 is the indium tin oxide layer of patterning, and the second transparency conducting layer 224 is the carbon nano-tube film without etching or lasser cutting.
Described first transparency conducting layer 222 and the second transparency conducting layer tool electrical impedance anisotropy.Described first transparency conducting layer 222 is less than the electrical impedance in other direction in the electrical impedance being parallel to a first direction on conductive layer surface, that is, described first transparency conducting layer 222 is minimum in the electrical impedance of this first direction.Described second transparency conducting layer 224 is less than the electrical impedance in other direction in the electrical impedance being parallel to a second direction on conductive layer surface, that is, described second transparency conducting layer 224 is minimum in the electrical impedance of this second direction.Described first direction is perpendicular to described second direction.Described multiple first electrode 223 is arranged at intervals at the side that the first transparency conducting layer 222 is parallel to second direction.Described multiple second electrode 225 is arranged at intervals at the side that the second transparency conducting layer 224 is parallel to first direction.In the present embodiment, described first direction is X-direction, and described second direction is Y-direction.Described multiple first electrode 223 interval is arranged and along Y-direction arrangement, described multiple second electrode 225 interval arranges and arranges in X direction.
Described first conducting wire 221 and the second conducting wire 227 are only arranged at routing region 10B.Described first conducting wire 221 is conductive silver slurry with multiple first electrode 223, and is formed by silk screen print method simultaneously.Described second conducting wire 227 is also conductive silver slurry with the material of multiple second electrode 225, and is formed by silk screen print method simultaneously.
Described first dielectric base 226, second dielectric base 220 and the 3rd dielectric base 228 are the structure of a curved face type or plane.Described in this, the first dielectric base 226 is equivalent to infrabasal plate, mainly plays a part to support.This second dielectric base 220 mainly plays insulation isolation.3rd dielectric base 228 is equivalent to upper substrate, can improve the permanance of touch-screen 20 and touch impression.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.Described 3rd dielectric base 228 can be fitted fixing by an optical clear glue-line (not shown) and the first transparency conducting layer 222.The material of described optical clear glue-line is acryl etc.
Figure 11 shows the touch points positioning system of the touch-screen 20 of the embodiment of the present invention, and wherein, the first transparency conducting layer 222 is minimum along the electrical impedance of first direction such as X-direction or y direction relative to the electrical impedance on other direction; Second transparency conducting layer 224 is minimum along the electrical impedance of second direction such as Y direction or X direction relative to the electrical impedance on other direction.Each first electrode 223 is connected to a sensing circuit 22 respectively by the first conducting wire 221, and it is in order to read the induced electricity signal of each the first electrode 223.Each second electrode 225 is connected to one drive circuit 24 respectively by the second conducting wire 227, and its electric signal inputting same pulse waveform or other waveform one by one or is simultaneously to each the second electrode 225.In other words, the first electrode 223 is in this as sensing electric signal contact pad, and the second electrode 225 is in this as driving electric signal contact pad.Sensing circuit 22 and driving circuit 24 controlled by a controller 26.
Figure 12 shows the merging schematic diagram of the first transparency conducting layer 222 and the second transparency conducting layer 224 in Figure 11.In the schematic diagram of Figure 11 and Figure 12, show 13 the first electrodes 223, and seven the second electrodes 225.By the touch points positioning system of Figure 11 and Figure 12 shownschematically touch-screen 20, when pointer or finger touch touch-screen 20, between the first electric capacity C1 value produced between first transparency conducting layer 222 and the second transparency conducting layer 224 and the first transparency conducting layer 222 and pointer or finger produce the second electric capacity C2 value, the sensing electric signal of all first electrodes 223 will be caused to have specific feature, and the touching that thus can judge touch-screen 20 is by this coordinate of position coordinates such as X-axis or transverse axis of touch points and the coordinate of Y-axis or the longitudinal axis on the surface.
The touch-screen that the embodiment of the present invention provides has the following advantages: first, carbon nano-tube has excellent mechanical characteristic and makes carbon nanotube layer have good toughness and physical strength, and resistance to bending, therefore adopt carbon nanotube layer as transparency conducting layer, the durability of touch-screen can be improved accordingly; And then improve the durability of the display device using this touch-screen; The second, because carbon nanotube layer comprises multiple equally distributed carbon nano-tube, therefore this carbon nanotube layer also has the distribution of uniform resistance, therefore, adopts this carbon nanotube layer can improve sensitivity and the degree of accuracy of touch-screen accordingly as transparency conducting layer; 3rd, because carbon nanotube layer is only arranged at the surface that dielectric base is positioned at touch area, and conducting wire is only arranged at the surface that dielectric base is positioned at routing region, namely, carbon nanotube layer and conducting wire do not have overlapping part, so when pointer or finger touch routing region, capacitance interference signal can not be produced between conducting wire and carbon nanotube layer, thus improve the accuracy of touch-screen.
In addition, those skilled in the art can also do other changes in spirit of the present invention, and these changes done according to the present invention's spirit all should be included in the present invention's scope required for protection.
Claims (12)
1. a preparation method for touch panel, the method comprises the following steps:
There is provided a dielectric base, one of this dielectric base defines two regions on the surface: a touch area and a routing region;
An adhesive-layer is formed on the surface of described dielectric base;
Solidification is positioned at the adhesive-layer of described routing region;
A carbon nanotube layer is formed on adhesive-layer surface;
Solidification is positioned at the adhesive-layer of described touch area, to be fixed by the carbon nanotube layer being positioned at touch area;
Remove the carbon nanotube layer being positioned at routing region and obtain a transparency conducting layer; And
Form electrode and conducting wire, it is characterized in that, first in the carbon nanotube layer table surface forming electrode and the conducting wire that are positioned at routing region, and then the carbon nanotube layer removed in routing region make electrode and reserve part carbon nano-tube between conducting wire and adhesive-layer.
2. the preparation method of touch panel as claimed in claim 1, it is characterized in that, the material of described adhesive-layer is thermoplastic, and the method that described solidification is positioned at the adhesive-layer of routing region is Local cooling method.
3. the preparation method of touch panel as claimed in claim 1, it is characterized in that, the material of described adhesive-layer is hot-setting adhesive, and the method that described solidification is positioned at the adhesive-layer of routing region is Local heating method.
4. the preparation method of touch panel as claimed in claim 1, it is characterized in that, the material of described adhesive-layer is UV glue, and described solidification is positioned at the method for the adhesive-layer of routing region for local uv irradiation method.
5. the preparation method of touch panel as claimed in claim 4, it is characterized in that, the method that described solidification is positioned at the adhesive-layer of routing region comprises the following steps:
By a mask, the UV glue-line being positioned at touch area is blocked;
UV-irradiation is adopted to be positioned at the UV glue-line of routing region; And
Remove mask.
6. the preparation method of touch panel as claimed in claim 1, is characterized in that, described carbon nanotube layer is formed by the method for printing, depositing or directly laying.
7. the preparation method of touch panel as claimed in claim 1, it is characterized in that, after the described surface at adhesive-layer forms the step of a carbon nanotube layer, the carbon nanotube layer being positioned at routing region is only formed at the adhesive-layer surface of solidification, and the carbon nanotube layer being arranged in touch area partly or entirely infiltrates uncured adhesive-layer.
8. the preparation method of touch panel as claimed in claim 1, it is characterized in that, after the described surface at adhesive-layer forms the step of a carbon nanotube layer, comprise this carbon nanotube layer of an extruding further, thus make the carbon nanotube layer being arranged in touch area infiltrate the step of adhesive-layer.
9. the preparation method of touch panel as claimed in claim 1, is characterized in that, described removal is positioned at the method for the carbon nanotube layer of routing region for being peeled off by adhesive tape bonding or peeled off by cleaning roller.
10. the preparation method of touch panel as claimed in claim 1, is characterized in that, described electrode and conducting wire are by the preparation of silk screen print method, chemical vapour deposition technique or magnetron sputtering method.
The preparation method of 11. 1 kinds of touch panels, the method comprises the following steps:
There is provided a dielectric base, one of this dielectric base defines two regions on the surface: a touch area and a routing region;
An adhesive-layer is formed on the surface of described dielectric base;
Solidification is positioned at the adhesive-layer of described routing region;
A carbon nanotube layer is formed on adhesive-layer surface;
Solidification is positioned at the adhesive-layer of described touch area, to be fixed by the carbon nanotube layer being positioned at touch area;
Form electrode and conducting wire; And
Remove the carbon nanotube layer being positioned at routing region and obtain a transparency conducting layer, it is characterized in that, first form electrode and conducting wire in the carbon nanotube layer surface screen-printed being positioned at routing region, then remove the carbon nanotube layer in routing region with described electrode and conducting wire for contraposition mask etching and make electrode and reserve part carbon nano-tube between conducting wire and adhesive-layer.
The preparation method of 12. touch panels as claimed in claim 11, is characterized in that, the method that described removal is positioned at the carbon nanotube layer of routing region is laser ablation method, particle beams etching method or E-beam lithography.
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| US9920207B2 (en) | 2012-06-22 | 2018-03-20 | C3Nano Inc. | Metal nanostructured networks and transparent conductive material |
| US10029916B2 (en) | 2012-06-22 | 2018-07-24 | C3Nano Inc. | Metal nanowire networks and transparent conductive material |
| CN103970314B (en) * | 2013-01-28 | 2017-04-19 | 宸鸿科技(厦门)有限公司 | Touch panel and manufacturing method thereof |
| US11274223B2 (en) | 2013-11-22 | 2022-03-15 | C3 Nano, Inc. | Transparent conductive coatings based on metal nanowires and polymer binders, solution processing thereof, and patterning approaches |
| CN104978058B (en) * | 2014-04-04 | 2019-05-07 | 宝宸（厦门）光学科技有限公司 | Circuit element and its manufacturing method |
| US9183968B1 (en) | 2014-07-31 | 2015-11-10 | C3Nano Inc. | Metal nanowire inks for the formation of transparent conductive films with fused networks |
| CN110922916B (en) * | 2019-12-11 | 2021-12-24 | 京东方科技集团股份有限公司 | Optical adhesive layer and preparation method thereof, display device and preparation method thereof, and terminal equipment |
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| CN101292362A (en) * | 2005-08-12 | 2008-10-22 | 凯博瑞奥斯技术公司 | Nanowires-based transparent conductors |
| CN101464759A (en) * | 2007-12-21 | 2009-06-24 | 清华大学 | Production method of touch screen |
| CN101943963A (en) * | 2009-07-08 | 2011-01-12 | 群康科技(深圳)有限公司 | Conducting plate and touch screen using same |
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| CN102576582A (en) * | 2009-06-30 | 2012-07-11 | Dic株式会社 | Method for forming pattern for transparent conductive layer |
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