CN102956284A - Transparent conductive film and touch panel using same - Google Patents
Transparent conductive film and touch panel using same Download PDFInfo
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- CN102956284A CN102956284A CN2011102549715A CN201110254971A CN102956284A CN 102956284 A CN102956284 A CN 102956284A CN 2011102549715 A CN2011102549715 A CN 2011102549715A CN 201110254971 A CN201110254971 A CN 201110254971A CN 102956284 A CN102956284 A CN 102956284A
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- nesa coating
- band
- electrically conducting
- conducting layer
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Abstract
The invention relates to a transparent conductive film which comprises a continuous transparent conducting layer and a plurality of transparent conducting strips arranged at intervals and extending along a first direction, wherein the plurality of transparent conducting strips are arranged on the surface of the transparent conducting layer and are in electric contact with the transparent conducting layer; the first direction is a low impedance direction of the transparent conductive film; and the resistivity of the transparent conductive film in the low impedance direction is smaller than that of the transparent conductive film in other directions. The invention also relates to a transparent conductive film which comprises a plurality of transparent conducting strips arranged at intervals and extend along a first direction, wherein the transparent conducting strips are electrically connected with each other through the transparent conducting layer; and the resistivity of the transparent conducting strips is smaller than that of the transparent conducting layer. In addition, the invention also relates to a touch panel which comprises at least one layer of the transparent conductive film. The transparent conductive film has impedance anisotropy, and the touch panel using the transparent conductive film can be used for realizing multipoint touch detection.
Description
Technical field
The contact panel that the present invention relates to a kind of nesa coating and use this nesa coating.
Background technology
In recent years, contact panel (Touch Panel) has been widely used in the electronic product miscellaneous, as: global positioning system (GPS), personal digital assistant (PDA), mobile phone (cellular phone) and notebook computer etc., to replace traditional input unit (as: keyboard and mouse etc.), significantly change in this design, not only promoted the man-machine interaction compatibility of these electronic installations, more because having omitted traditional input unit, and vacate more spaces, for large-scale display floater is installed, make things convenient for the user to browse data.
Nesa coating as the medium of sensing touch, is the important component of contact panel.The material of nesa coating commonly used is with tin indium oxide (ITO), tin oxide (SnO at present
2), zinc oxide (ZnO) etc. is main.Wherein, ITO because of have high light transmittance, good conductivity and easily the advantage such as etching be widely used.
Yet contact panel of the prior art only realizes that usually single-point touches detects, and the accuracy of detection of touch point is not high.
Summary of the invention
In view of this, necessaryly a kind of nesa coating is provided and uses this nesa coating can realize that multiple point touching detects and can improve the contact panel of touch point accuracy of detection.
A kind of nesa coating, comprise a continuous transparency conducting layer, and a plurality of electrically conducting transparent bands that are spaced and extend along first direction, these a plurality of electrically conducting transparent bands are arranged at this layer at transparent layer, and electrically contact with this transparency conducting layer, described first direction is the Low ESR direction of this nesa coating, and the resistivity of this nesa coating on described Low ESR direction is much smaller than this nesa coating resistivity in the other direction.
A kind of nesa coating, this nesa coating comprise and a plurality ofly be spaced and along the electrically conducting transparent band that first direction extends, mutually be electrically connected by a transparency conducting layer, and this electrically conducting transparent band is in the resistivity of the first direction resistivity less than this transparency conducting layer.
A kind of contact panel comprises at least above-mentioned nesa coating of one deck, a substrate and a plurality of electrode, and this nesa coating is arranged at this substrate surface, and these a plurality of electrodes are electrically connected with this nesa coating respectively.
Compared to prior art, nesa coating of the present invention has impedance anisotropy, so that the resistance of conducting film differs greatly at different directions between touch point and each different electrode of distance, thereby the changing value of the sensing signal that reads from those electrodes before and after touching also differs greatly, and utilizes the changing value size of the sensing signal that this characteristic can be directly reads according to electrode to determine the position coordinates of one or more touch points.And because the impedance anisotropy of this nesa coating changes obviously the signal value of the one or more electrodes corresponding with the touch point before and after touching, can change the accuracy of detection that obvious signal value improves the touch point position coordinates according to this.
Description of drawings
The plan structure schematic diagram of the nesa coating that Fig. 1 provides for the embodiment of the invention.
The structural representation of the nesa coating that comprises discontinuous electrically conducting transparent band that Fig. 2 provides for the embodiment of the invention.
The structural representation of the nesa coating that comprises wavy electrically conducting transparent band that Fig. 3 provides for the embodiment of the invention.
The structural representation of the nesa coating of the electrically conducting transparent band of the change width that Fig. 4 provides for the embodiment of the invention.
The structural representation of the nesa coating of the transparency conducting layer that Fig. 5 makes for the mixed slurry by carbon nano-tube and transparent conductive polymer that the embodiment of the invention provides.
The transparency conducting layer that Fig. 6 provides for the embodiment of the invention is the structural representation of the nesa coating of carbon nano-tube membrane.
The plan structure schematic diagram of the contact panel that Fig. 7 provides for the embodiment of the invention.
The side-looking structural representation of the contact panel that Fig. 8 provides for the embodiment of the invention.
The change in voltage curve at place, touch point in the contact panel that Fig. 9 provides for the embodiment of the invention.
The main element symbol description
| Nesa coating | 10 |
| Transparency conducting |
12 |
| The electrically conducting |
14 |
| |
100 |
| |
102 |
| The |
104 |
| The |
106 |
| The first side | 112 |
| The second side | 114 |
Following embodiment further specifies the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Describe the nesa coating of the embodiment of the invention and the contact panel that uses this nesa coating in detail below with reference to accompanying drawing.
See also Fig. 1, the embodiment of the invention provides a kind of nesa coating 10, this nesa coating 10 comprises at least one continuous transparency conducting layer 12, and a plurality of electrically conducting transparent bands 14 are spaced and extend along first direction, these a plurality of electrically conducting transparent bands 14 are arranged at this transparency conducting layer 12 surfaces, and electrically contact with this transparency conducting layer 12, described first direction is the Low ESR direction D of this nesa coating 10, and the resistivity of this nesa coating 10 on described Low ESR direction D is much smaller than this nesa coating 10 resistivity in the other direction.
This nesa coating 10 all can conduct electricity in all directions, and has a direction that impedance is minimum, i.e. Low ESR direction D.This Low ESR direction D is parallel to nesa coating 10 surfaces.Resistivity on described Low ESR direction is less compared to the resistivity of direction that other are parallel to nesa coating 10 surfaces.Because this nesa coating 10 resistivity in different directions is different, thereby makes this nesa coating 10 have impedance anisotropy.In described nesa coating 10, be electrically connected by described transparency conducting layer 12 between described a plurality of electrically conducting transparent bands 14.This transparency conducting layer 12 is preferably impedance isotropism conductive layer, and namely the resistivity of this transparency conducting layer 12 on all directions that are parallel to nesa coating 10 surfaces is identical.Preferably, this transparency conducting layer 12 is even continuous layer structure.In addition, the resistivity of this transparency conducting layer 12 is greater than the resistivity of these electrically conducting transparent band 14 length bearing of trends.The resistivity of the electrically conducting transparent band 14 that this extends along first direction can be 1:100 to 1:1000 with the ratio of the resistivity of this transparency conducting layer 14.Preferably, this ratio can be 1:100 to 1:400.This transparency conducting layer 12 also can be an impedance anisotropy conductive layer, as by the carbon nano-tube membrane that pulls a carbon nano pipe array and obtain.To having minimum resistivity, and this minimum specific resistance is greater than the resistivity of these electrically conducting transparent band 14 length bearing of trends at least one party who is parallel to these transparency conducting layer 12 surfaces for the anisotropic transparency conducting layer 12 of this impedance.This transparency conducting layer 12 can be one or more layers.The number of plies of described transparency conducting layer 12 also can be required according to this nesa coating 10 the light transmittance adjustment.
This electrically conducting transparent band 14 can be anisotropic for impedance isotropism or impedance.This electrically conducting transparent band 14 can be continuous or discontinuous.The described end of a described electrically conducting transparent band 14 along described Low ESR direction D from this transparency conducting layer 12 that refer to continuously extends to the other end.The Low ESR direction of the bearing of trend of this electrically conducting transparent band 14 and described nesa coating 10 is same direction.This continuous electrically conducting transparent band 14 can be more than or equal to the length of this transparency conducting layer 12 at described Low ESR direction D in the length of bearing of trend.See also Fig. 2, describedly discontinuously refer to that a described electrically conducting transparent band 14 extends to the other end by interval on a plurality of bearing of trends and the end of electrically conducting transparent band along described Low ESR direction D from this transparency conducting layer 12 that substantially be in a straight line.These a plurality of spaced electrically conducting transparent bands can further improve the light transmittance of this nesa coating 10.
The material of this transparency conducting layer 12 and described a plurality of electrically conducting transparent bands 14 is transparent conductive material.The material of this transparency conducting layer 12 and electrically conducting transparent band 14 can be identical or different, only need to guarantee this nesa coating 10 in the resistivity of described Low ESR direction D less than the resistivity on other directions.Preferably, the material of described transparency conducting layer 12 and electrically conducting transparent band 14 is different, the transparent conductive material that described transparency conducting layer 12 optional usefulness have higher electric resistivity, and described electrically conducting transparent band 14 can be chosen the transparent conductive material with low resistivity.
Described transparent conductive material can be the combination of metal oxide, metal nitride, metal fluoride, conducting polymer, carbonaceous material or those materials with transparent and electrically conductive performance etc.Described metal oxide can be tin oxide (SnO
2), zinc oxide (ZnO), cadmium oxide (CdO), indium oxide (In
2O
3) etc. pure metal oxides, or tin indium oxide (In
2O
3: Sn, ITO), indium zinc oxide (ZnO:In, IZO), zinc oxide sow (ZnO:Ga, GZO), zinc oxide aluminum (ZnO:Al, AZO) or titanium oxide tantalum (TiO
2: the metal oxide that Ta) etc. mixes, or In
2O
3-ZnO, CdIn
2O
4, Cd
2SnO
4, Zn
2SnO
4Deng mixed-metal oxides.Described metal nitride can be titanium nitride (TiN) etc.Described metal fluoride can be the tin oxide (SnO that fluorine mixes
2: F) etc.Described conducting polymer can be poly-ethyl bis ether thiophene (poly (and 3,4-ethylenedioxythiophen), PEDOT) or the synthetic (PEDOT-PSS) of PEDOT and Polystyrene Sulronate (polystyrene sulfonate, PSS) etc.Described carbonaceous material can be Graphene or carbon nano tube transparent conducting film etc., this transparency conducting layer 12 and a plurality of electrically conducting transparent band 14 can be graphene sheet layer and/or carbon nano tube transparent conducting film etc., and this carbon nano tube transparent conducting film can be the composite transparent conductive film of pure nano-carbon tube nesa coating or carbon nano-tube and other transparent materials.
The preparation method of this nesa coating 10 does not limit, as long as pass through at this uniform resistivity and the higher transparency conducting layer 12 electrically conducting transparent bands 14 of surface by adding low-resistivity and extending along specific direction, the resistivity of these nesa coating 10 integral body is changed with direction, and have described Low ESR direction D and get final product.Transparency conducting layer 12 and electrically conducting transparent band 14 as described in making respectively such as the material that can adopt different conductivity.See also Fig. 5, in the embodiment of the invention, this transparency conducting layer 12 is the nesa coating that carbon nano-tube and transparent conductive polymer are compounded to form.Such as the carbon nano tube transparent conducting film that the mixed slurry of carbon nano-tube and transparent conductive polymer (such as PEDOT-PSS) forms, the unordered even distribution of the carbon nano-tube in this carbon nano tube transparent conducting film, the material of this electrically conducting transparent band 14 is tin indium oxide.See also Fig. 6, in another embodiment of the present invention, this transparency conducting layer 12 is a carbon nano-tube membrane, and this carbon nano-tube membrane obtains by pulling a carbon nano pipe array, and the most of carbon nano-tube in this carbon nano-tube membrane join end to end and extend in the same direction.The material of described electrically conducting transparent band 14 is tin indium oxide, and this carbon nano-tube membrane can directly be layed in these a plurality of indium tin oxide transparent conduction bands 14 surfaces and form described nesa coating 10.
The shape of these a plurality of electrically conducting transparent bands 14 is not limit, and only need guarantee the resistivity on this nesa coating 10 is along the resistivity on the described Low ESR direction D much smaller than other directions.The shape of this electrically conducting transparent band 14 can be vertical bar band, a few font band, zigzag band, stairstepping band, zigzag band, arc band or wavy band etc.See also Fig. 3, in the embodiment of the invention, described electrically conducting transparent band 14 can be wavy band, and the end of this wavy band along described Low ESR direction D from described transparency conducting layer 12 extends to the other end.The band that can be wide band or change width of this electrically conducting transparent band 14.See also Fig. 4, in the embodiment of the invention, this electrically conducting transparent band 14 is the conduction band of change width, because the change width of this electrically conducting transparent band 14, make this nesa coating 10 in the change in resistance of described Low ESR direction D, thereby can further increase the impedance anisotropy of this nesa coating 10.
Can be spacing equidistant or that change between these a plurality of electrically conducting transparent bands 14.When this nesa coating 10 was applied in the contact panel, the distance between adjacent two described electrically conducting transparent bands 14 was to be difficult for being visually principle.In the embodiment of the invention, spaced set between these a plurality of electrically conducting transparent bands 14, the distance W between adjacent two described electrically conducting transparent bands 14 can be less than or equal to 50 microns, and in the embodiment of the invention, this distance W is 30 microns.
In addition, need to prove that the distance between the described electrically conducting transparent band 14 is not limited to above-mentioned scope, can determine according to field and mode that described nesa coating 10 is used.As when this nesa coating 10 is applied to large touch panel, described distance can change according to the size of this contact panel is corresponding.
The quantity of these a plurality of electrically conducting transparent bands 14 can be determined according to the concrete application mode of this nesa coating 10.As, when this nesa coating 10 was applied in the contact panel as the transparency conducting layer of sensing touch, the quantity of this electrically conducting transparent band 14 can be determined according to the quantity of the electrode that is electrically connected with this electrically conducting transparent band 14.
This nesa coating 10 can prepare by the following method:
S1 forms described a plurality of electrically conducting transparent band 14 that is spaced and extends along equidirectional; And
S2 forms described transparency conducting layer 12 on these a plurality of electrically conducting transparent bands 14 surfaces, to form this nesa coating 10.
In above-mentioned steps S1, can directly form separately described a plurality of surface that is spaced and again this electrically conducting transparent band 14 is covered a substrate along the electrically conducting transparent band 14 that equidirectional extends, also can provide first a substrate, then form described a plurality of electrically conducting transparent bands 14 at this substrate.Form described a plurality of electrically conducting transparent band 14 at a substrate surface in the embodiment of the invention, specifically may further comprise the steps:
S11 is arranged at described substrate surface with a transparent conductive material with low-resistivity and forms a film;
S12, this film of patterning form a plurality of electrically conducting transparent bands 14 that are spaced and extend along equidirectional.
In above-mentioned steps S11, this transparent conductive material can form described film at described substrate surface by methods such as vacuum vapour deposition, sputtering method, ion plating method, vacuum plasma CVD method, spray pyrolysis (spray pyrolysis) method, hot CVD method or sol-gal processes.In the embodiment of the invention, the tin indium oxide evaporation is formed indium tin oxide films in described substrate surface.
In above-mentioned steps S12, the method for this patterning can be concavo-convex transfer printing, wet etch method, dry ecthing method, laser patterning method, scrape division or adhesive tape removes method etc.Adopt the method for the described indium tin oxide films of laser ablation to form the described electrically conducting transparent band 14 that is spaced and arranges along equidirectional in the embodiment of the invention.
In above-mentioned steps S2, may be separately formed described transparency conducting layer 12 and again this transparency conducting layer 12 is covered described electrically conducting transparent band 14, or directly form described transparency conducting layer 12 on described electrically conducting transparent band 14 surfaces.In the embodiment of the invention, then described transparency conducting layer 12 directly is coated on described transparent electrically conducting transparent band 14 surfaces and forms by carbon nano-tube and transparent conductive polymer PEDOT-PSS are mixed the formation coating liquid.In another embodiment of the present invention, described transparency conducting layer 12 forms separately, and this transparency conducting layer 12 is described carbon nano-tube membrane.
Be appreciated that in said method described step S1 and S2 are interchangeable, namely also can form first described a plurality of electrically conducting transparent band 14, form described transparency conducting layer 12 on these a plurality of electrically conducting transparent bands 14 surfaces again, to obtain described nesa coating 10.
Embodiment 1
See also Fig. 5, the transparent conductive material tin indium oxide is sputtered in transparency carrier pet sheet face forms film, utilize the method for laser ablation to form wide straight banded a plurality of electrically conducting transparent bands 14 at this film surface according to Low ESR direction D.The mixed liquor of preparation carbon nanotube powder and transparent conductive polymer PEDOT-PSS, this mixed liquor is coated on these a plurality of electrically conducting transparent bands 14 surfaces forms a uniform coating, dry this coating of processing obtains described transparency conducting layer 12, thereby forms described nesa coating 10.
Embodiment 2
See also Fig. 6, the generation type of described electrically conducting transparent band 14 is identical with embodiment 1, difference is, described transparency conducting layer 12 obtains by the following method: provide one to surpass the in-line arrangement carbon nano pipe array, from this array, pull and obtain aforementioned carbon nano-tube membrane as described transparency conducting layer 12, most of carbon nano-tube in this carbon nano-tube membrane join end to end and extend along equidirectional, and this carbon nano-tube membrane is a self supporting structure.Because this carbon nano-tube membrane itself has viscosity, therefore, this carbon nano-tube membrane is directly adhered to described a plurality of electrically conducting transparent band 14 surfaces form described nesa coating 10.Wherein, the bearing of trend of the carbon nano-tube in the carbon nano-tube membrane is substantially vertical with the bearing of trend of described indium tin oxide transparent conduction band 14.
Described nesa coating 10 can be applicable to be used in the contact panel sensing touch, the embodiment of the invention further provides a kind of contact panel, comprise at least described nesa coating 10 of one deck, a substrate and a plurality of electrode, this nesa coating 10 is arranged at this substrate surface, the mutual space isolation of these a plurality of electrodes, and be electrically connected with this nesa coating 10 respectively.This nesa coating 10 is arranged at the zone that this contact panel is used for the sensing position of touch.
Described contact panel can be resistance-type or capacitance type touch-control panel.Use this contact panel that is used for the nesa coating 10 of sensing position of touch and can realize multiple point touching, and because this nesa coating 10 has impedance anisotropy, no matter be electric resistance touch-control panel or capacitance type touch-control panel, when using touch control object to touch this contact panel, the a plurality of electrodes adjacent with the touch point counter electrode change obvious signal value before and after all can detecting and touching, and utilize those to change the accuracy of detection that obvious signal value is easier to detect the position coordinates of touch point and can improves the touch point position coordinates.The mutual space of these a plurality of electrodes isolates, and is electrically connected with at least one end of described electrically conducting transparent band 14 bearing of trends.Describe with capacitance type touch-control panel in the embodiment of the invention.
See also Fig. 7 and Fig. 8, the embodiment of the invention is applied to a surface capacitance type touch panel 100 with single transparency conducting layer with this nesa coating 10, this contact panel 100 comprises a substrate 102, be arranged at the described single-layer and transparent conducting film 10 on this substrate 102, and a plurality of the first electrode 104 and a plurality of the second electrode 106.This nesa coating 10 has two sides, these two sides are vertical with described Low ESR direction D, these a plurality of first electrodes 104 and a plurality of the second electrode 106 are arranged at respectively described two sides of this nesa coating 10, and are electrically connected with this conducting film 10 respectively.The described side that defines 104 settings of described a plurality of the first electrode is first side 112, and the described side that defines 106 settings of described a plurality of the second electrode is second side 114.Preferably, these a plurality of first electrodes 104 are corresponding one by one with these a plurality of second electrodes 106.
In one embodiment, the quantity of the electrically conducting transparent band 14 of this nesa coating 10 and described the first electrode 104 and identical with the quantity of the second electrode 106 corresponding to this first electrode 104.The two ends that this every electrically conducting transparent band 14 length direction extend are electrically connected with described the first electrode 104 and the second electrode 106 corresponding with it respectively.Described the first electrode 104 and the second electrode 106 are both as providing the drive electrode that drives signal for this contact panel 100, again as the sensing electrode that reads induced signal after touching.This driving and sensing all can be realized by a control circuit (not shown).
When the user touches this contact panel 100 with finger or other conductor, can form a coupling capacitance between the finger that contacts with this contact panel or other conductor and the described nesa coating 10, thereby cause voltage that the electrode place reads or the variation of current signal, come detected touch point according to the variation of this signal.Be further detected touch point, the embodiment of the invention defines a high impedance direction H, and this high impedance direction H is substantially vertical with described Low ESR direction D.Because this nesa coating 10 has impedance anisotropy, utilize the variation difference of the induced signal that this nesa coating 10 senses at Low ESR direction D and high impedance direction H, this contact panel 100 can realize that the multiple point touching of single transparency conducting layer detects.
The detection of described touch point can realize by the following method:
B1 provides respectively first electrode 104 and second electrode 106 of driving voltage to described contact panel 100;
B2 adopts the touch conductor to touch this contact panel 100, and the electric capacity of touch location is changed;
B3 measures and reads the first electrode 104 of described contact panel 100 and the induced signal of the second electrode 106 places output, and
B4 analyzes above-mentioned induced signal, to determine the position, touch point.
In above-mentioned steps B3, described induced signal can be the changing value of electric current, voltage, electric capacity or those parameters.The changing value curve of the voltage that this induced signal reads for described the first electrode 104 before and after touching and the second electrode 106 places in the embodiment of the invention.
In above-mentioned steps B4, can obtain the position coordinates of this touch point by the variation of the described induced signal that reads before and after touching.The embodiment of the invention provides a kind of method of determining this touch point position coordinates based on above-mentioned contact panel 100, and the method further comprises the steps:
B41 determines the position coordinates of this touch point on high impedance direction H by the voltage change curve of this first electrode 104 or the second electrode 106, and
B42 determines the position coordinates of this touch point on Low ESR direction D in conjunction with the voltage swing curve of this first electrode 104 and the second electrode 106.
See also Fig. 9, Fig. 9 is the magnitude of voltage change curve schematic diagram that described each first electrode 104 of the embodiment of the invention and the second electrode 106 places read.So that describe, at first the parameter among this figure and numbering are described: P, Q are that two fingers touch the touch point that this contact panel 100 produces simultaneously, and the coordinate of wherein establishing touch point P is (x
p, y
p), the coordinate of touch point Q is (x
q, y
q).Herein, this y
pAnd y
qBe the touch point to the distance of described first side 112.These a plurality of the first electrode 104 number consecutivelies are M
1, M
2, M
3, M
4, M
5, M
6, M
7, M
8These a plurality of the second electrode 106 number consecutivelies are N
1, N
2, N
3, N
4, N
5, N
6, N
7, N
8These a plurality of first electrodes 104 are followed successively by X at the coordinate of high impedance direction H
1, X
2, X
3, X
4, X
5, X
6, X
7, X
8And because described a plurality of the second electrodes 106 are relative one by one with described a plurality of the first electrodes 104, therefore, this second electrode 106 respect to one another is also identical at the coordinate of high impedance direction H with the first electrode 104, and namely these a plurality of second electrodes 106 also are X at the coordinate of high impedance direction H
1, X
2, X
3, X
4, X
5, X
6, X
7, X
8Below when describing each first electrode 104 or each the second electrode 106, will substitute with its numbering separately respectively.In addition, Δ V
1iM for described the first electrode 104
iVoltage change before and after the touch that the electrode place reads, n=1,2 ... 8; Correspondingly, Δ V
2iN for described the second electrode 106
iThe changing value of voltage before and after the touch that the electrode place reads.
(1) determines that this touch point P and Q are at the position coordinates of high impedance direction H
This touch point P and Q can obtain by the magnitude of voltage change curve of this first electrode 104 or the second electrode 106 at the position coordinates of high impedance direction H.The embodiment of the invention is take the magnitude of voltage change curve of this first electrode 104 as example: as can be seen from Figure 9, in the magnitude of voltage change curve of this first electrode 104, the M relative with touch point P
3And the electrode M relative with touch point Q
6The voltage change Δ V that reads out
13And Δ V
16Maximum is in the crest location of the magnitude of voltage change curve of whole the first electrode 104.And and M
3Adjacent M
2And M
4Two value Δ V that read
12With Δ V
14Be worth close and less than M
3The value Δ V that reads out
13, similarly, with M
6Two value Δ V that adjacent M5 and M7 read
15With Δ V
17Close and less than M
6The value Δ V that reads out
16And the Δ V that other first electrodes 104 far away apart from the distance of these two touch point P, Q read
1iBe worth less, this mainly be because this touch point P over against M
3, touch point Q is over against M
6Therefore, can directly judge this touch point I according to this wave mode is x at the coordinate of high impedance direction H
p=X
3, x
q=X
6In addition, when described touch point during not over against described the first electrode 104, this touch point P can utilize and this variation Δ V greatly at the coordinate of high impedance direction H
13The coordinate of left and right sides adjacent electrode or all electrodes with and voltage change calculate, can be such as this formula:
Similarly, touch point Q at the coordinate of high impedance direction H is
Be appreciated that and also can calculate with other formula this touch point P and the position coordinates of Q on high impedance direction H.
(2) determine this touch point P and the Q coordinate on Low ESR direction D
Because the nesa coating 10 of this contact panel 100 is the impedance anisotropic membrane, therefore, the sensing voltage value at the electrode place of close this touch point P or Q changes greatly on conductive path.Namely on Low ESR direction D, the touch point is the closer to electrode, and the voltage change that reads from this electrode is larger.Take touch point P as example, as can be seen from Figure 9, this touch point P is to the first electrode M
3Distance with respect to this touch point P to the second electrode N
3Close together, the first electrode M
3The voltage change that the place senses is with respect to the second electrode N
3The voltage change that the place senses is larger.Therefore, can according to this touch point P the size of the voltage change that reads of corresponding the first electrode 104 or the second electrode 106 places judge that this touch point is at the position coordinates of Low ESR direction D.The ratio of the voltage change that also can read according to one or more the first electrodes 104 corresponding to described touch point P and one or more the second electrodes 106 places in addition, obtains this touch point P to the first side 112 of described contact panel 100 or the distance of second side.As
Or
, wherein L is that described first side 112 is to the vertical range of described second side 114.Be appreciated that and also can calculate with other formula this touch point P and the position coordinates of Q on high impedance direction H.
Only take the detection of two touch points as example, also can detect more touch point according to said method in the embodiment of the invention.
Compared to prior art, because nesa coating provided by the invention has impedance anisotropy, so that the resistance of nesa coating differs greatly at different directions between touch point and each different electrode of distance, thereby the changing value of the sensing signal that reads from those electrodes before and after touching also differs greatly, and utilizes the changing value size of the sensing signal that this characteristic can be directly reads according to electrode to determine the position coordinates of one or more touch points.And because the impedance anisotropy of this nesa coating changes obviously the signal value of the one or more electrodes corresponding with the touch point before and after touching, can improve the accuracy of detection of touch point position coordinates according to the obvious signal value of these a plurality of variations.
In addition, those skilled in the art also can do other variation in spirit of the present invention, and certainly, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (19)
1. nesa coating, it is characterized in that, this nesa coating comprises a continuous transparency conducting layer, and a plurality of electrically conducting transparent bands that are spaced and extend along first direction, these a plurality of electrically conducting transparent bands are arranged at this layer at transparent layer, and electrically contact with this transparency conducting layer, described first direction is the Low ESR direction of this nesa coating, the resistivity of this nesa coating on described Low ESR direction is less than this nesa coating resistivity in the other direction.
2. nesa coating as claimed in claim 1 is characterized in that, described transparency conducting layer is impedance isotropism conducting film, and described electrically conducting transparent band is 1:100 to 1:1000 at the ratio of the resistivity of described first direction and the resistivity of transparency conducting layer.
3. nesa coating as claimed in claim 1 is characterized in that, described electrically conducting transparent band in the length of first direction more than or equal to the length of described transparency conducting layer on described first direction.
4. nesa coating as claimed in claim 1 is characterized in that, continuously, the end of each described electrically conducting transparent band along described first direction from this transparency conducting layer extends to the other end to described electrically conducting transparent band on first direction.
5. nesa coating as claimed in claim 1 is characterized in that, described electrically conducting transparent band is discontinuous on first direction.
6. nesa coating as claimed in claim 1, it is characterized in that the material of described transparency conducting layer and electrically conducting transparent band is metal oxide, metal nitride, metal fluoride, conducting polymer, Graphene or the carbon nano tube transparent conducting film that comprises a plurality of carbon nano-tube.
7. nesa coating as claimed in claim 6, it is characterized in that at least a in the material of described nesa coating is that tin oxide, zinc oxide, cadmium oxide, indium oxide, tin indium oxide, indium zinc oxide, zinc oxide are sowed, zinc oxide aluminum, titanium oxide tantalum, titanium nitride fluorine mix tin oxide, poly-ethyl bis ether thiophene and the poly-ethyl bis ether thiophene-Polystyrene Sulronate.
8. nesa coating as claimed in claim 1 is characterized in that, the material of described transparency conducting layer and electrically conducting transparent band is different.
9. nesa coating as claimed in claim 8, it is characterized in that, the material of described transparency conducting layer is the combination of conducting polymer, carbon nano-tube, Graphene or those materials, and the material of described electrically conducting transparent band is the combination of metal oxide, metal nitride, metal fluoride or those materials.
10. nesa coating as claimed in claim 9 is characterized in that, described transparency conducting layer is the composite membrane of carbon nano-tube and the poly-ethyl bis ether thiophene-Polystyrene Sulronate of transparent conductive polymer, and the material of described electrically conducting transparent band is tin indium oxide.
11. nesa coating as claimed in claim 9, it is characterized in that, described transparency conducting layer is the carbon nano-tube membrane, and the material of described electrically conducting transparent band is tin indium oxide, and the bearing of trend of carbon nano-tube is perpendicular to described Low ESR direction in the described carbon nano-tube membrane.
12. nesa coating as claimed in claim 1 is characterized in that, described electrically conducting transparent band be shaped as vertical bar band, a few font band, in a zigzag band, stairstepping band, zigzag band, arc band or wavy band.
13. nesa coating as claimed in claim 12 is characterized in that, the conduction band that described electrically conducting transparent band is wide or change width.
14. nesa coating as claimed in claim 1 is characterized in that, described transparency conducting layer is self supporting structure.
15. nesa coating, it is characterized in that, this nesa coating comprises and a plurality ofly is spaced and along the electrically conducting transparent band that first direction extends, mutually is electrically connected by a continuous transparency conducting layer, and this electrically conducting transparent band is in the resistivity of the first direction resistivity less than this transparency conducting layer.
16. contact panel, it is characterized in that, comprise at least each described nesa coating, a substrate and a plurality of electrode in one deck such as the claim 1 to 15, this nesa coating is arranged at this substrate surface, and these a plurality of electrodes are electrically connected with this nesa coating respectively.
17. contact panel as claimed in claim 16 is characterized in that, described contact panel is electric resistance touch-control panel or capacitance type touch-control panel.
18. contact panel as claimed in claim 16 is characterized in that, described a plurality of electrodes are electrically connected with at least one end of the electrically conducting transparent band bearing of trend of described nesa coating respectively.
19. contact panel as claimed in claim 16 is characterized in that, the distance between the adjacent described electrically conducting transparent band is less than or equal to 50 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102549715A CN102956284A (en) | 2011-08-31 | 2011-08-31 | Transparent conductive film and touch panel using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102549715A CN102956284A (en) | 2011-08-31 | 2011-08-31 | Transparent conductive film and touch panel using same |
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| CN102956284A true CN102956284A (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102549715A Pending CN102956284A (en) | 2011-08-31 | 2011-08-31 | Transparent conductive film and touch panel using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109976591A (en) * | 2017-12-28 | 2019-07-05 | 盈天实业(深圳)有限公司 | Touch sensing and its preparation method and application |
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| CN1849615A (en) * | 2003-07-15 | 2006-10-18 | 伊罗接触***公司 | Touch sensor with non-uniform resistive band |
| CN101901069A (en) * | 2009-05-26 | 2010-12-01 | 群康科技(深圳)有限公司 | Multipoint touch screen and driving method thereof |
| CN102016768A (en) * | 2008-02-28 | 2011-04-13 | 3M创新有限公司 | Touch screen sensor having varying sheet resistance |
| CN102033669A (en) * | 2009-09-24 | 2011-04-27 | 群康科技(深圳)有限公司 | Capacitance-type touch panel |
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| CN1849615A (en) * | 2003-07-15 | 2006-10-18 | 伊罗接触***公司 | Touch sensor with non-uniform resistive band |
| CN102016768A (en) * | 2008-02-28 | 2011-04-13 | 3M创新有限公司 | Touch screen sensor having varying sheet resistance |
| CN101901069A (en) * | 2009-05-26 | 2010-12-01 | 群康科技(深圳)有限公司 | Multipoint touch screen and driving method thereof |
| CN102033669A (en) * | 2009-09-24 | 2011-04-27 | 群康科技(深圳)有限公司 | Capacitance-type touch panel |
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| CN109976591A (en) * | 2017-12-28 | 2019-07-05 | 盈天实业(深圳)有限公司 | Touch sensing and its preparation method and application |
| CN109976591B (en) * | 2017-12-28 | 2022-11-18 | 盈天实业(深圳)有限公司 | Touch sensor and preparation method and application thereof |
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Application publication date: 20130306 |