CN102479015A - Capacitive touch screen - Google Patents
Capacitive touch screen Download PDFInfo
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- CN102479015A CN102479015A CN2010105738945A CN201010573894A CN102479015A CN 102479015 A CN102479015 A CN 102479015A CN 2010105738945 A CN2010105738945 A CN 2010105738945A CN 201010573894 A CN201010573894 A CN 201010573894A CN 102479015 A CN102479015 A CN 102479015A
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- carbon nanotube
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Abstract
The present invention relates to a capacitive touch screen, comprising: a cover plate, a carbon nanotube layer, at least one first driving electrode and at least one second driving electrode. The cover plate is provided with a first surface and a second surface which are opposite, and the first surface is a touch surface. The carbon nanotube layer is adhered to the second surface of the cover plate through an adhesive layer. The carbon nanotube layer has a conductive anisotropy to define a low resistance direction. The carbon nanotube layer has opposite first and second side edges. The low impedance direction is from the first side to the second side. The at least one first driving electrode is arranged on the first side edge of the carbon nano tube layer. The at least one second driving electrode is arranged on the second side edge of the carbon nano tube layer. The at least one first driving electrode and the at least one second driving electrode are electrically connected with the carbon nanotube layer. The at least one first driving electrode and the at least one second driving electrode are connected with a driving circuit and a sensing circuit.
Description
Technical field
The present invention relates to a kind of capacitive touch screen.
Background technology
In recent years, be accompanied by the high performance and the diversified development of various electronic equipments such as mobile phone and touch navigation system, the electronic equipment that the touch-screen of light transmission is installed in the front of display devices such as liquid crystal progressively increases.The user of such electronic equipment is through touch-screen, on one side the displaying contents of the display device that is positioned at the touch-screen back side is carried out visual confirmation, utilize modes such as finger or pen to push touch-screen on one side and operate.Thus, various functions that can operating electronic equipment.
Different according to the principle of work of touch-screen and transmission medium, existing touch-screen is divided into four types, is respectively resistance-type, condenser type, infrared-type and surface acoustic wave type.Wherein capacitive touch screen is higher because of accuracy, antijamming capability is strong uses comparatively extensively (Japanese plum basis, Wang Qingdi, Ji Jianhua, photoelectron technology, Vol.15, P62 (1995)).
Existing capacitive touch screen generally comprises an insulated substrate, is formed on the transparency conducting layer of this insulated substrate upper surface at least, and a plurality of metal electrodes that are formed on this transparency conducting layer edge.When touch objects such as finger touch on touch screen surface; Because people's bulk electric field; Form a coupling capacitance between the transparency conducting layer in touch objects such as finger and the touch-screen, through metal electrode and external circuits this coupling capacitance is carried out sensing, thereby draw touch point position.U.S. Patent No. application on the 11st May in 2006 US2006/0097991A1 has also disclosed a kind of multiple spot capacitive touch screen; Its upper and lower surfaces at a substrate all forms parallel bar shaped transparency conducting layer; And make the bar shaped transparency conducting layer of this upper and lower surfaces arranged in a crossed manner each other; Form sense wire and sweep trace, thereby realize multimetering.Transparency conducting layer in the above-mentioned capacitive touch screen adopts indium tin oxide (ITO) layer usually.The ITO layer mainly adopts method preparations such as sputter or vapor deposition, and processing procedure is complicated.This kind touch-screen is because the upper and lower surfaces of substrate is provided with bar paten ITO layer, so its complex structure.
Summary of the invention
In view of this, necessaryly provide a kind of simple in structure, the touch-screen of thinner thickness.
A kind of capacitive touch screen, it comprises: a cover plate, a carbon nanotube layer, at least one first drive electrode and at least one second drive electrode.This cover plate has opposite first and second surface, and said first surface is a touch-control surface.Said carbon nanotube layer adheres to the second surface of cover plate through an adhesive layer.Said carbon nanotube layer has conduction anisotropy to define a Low ESR direction.Carbon nanotube layer has relative first side and second side.Said Low ESR direction is to point to the second side by the first side.Said at least one first drive electrode is arranged at the first side of carbon nanotube layer.Said at least one second drive electrode is arranged at the second side of carbon nanotube layer.Said at least one first drive electrode and said at least one second drive electrode all are electrically connected with this carbon nanotube layer.Said at least one first drive electrode and said at least one second drive electrode all are connected with an one drive circuit and a sensing circuit.
Compared with prior art; Capacitive touch screen provided by the invention has the following advantages: one of which, only a transparency conducting layer need be set in the surface of cover plate; Utilize the special conduction anisotropy of carbon nanotube layer; Can make this touch-screen realize single touch point touch-control or multiple touch points touch-control, a plurality of transparency conducting layers need not be set, also need not the patterned transparency conducting layer.And carbon nanotube layer can be set directly on the cover plate, and is simple in structure, can significantly reduce the thickness of conventional touch screen, realizes the application of ultra-thin touch-screen.Its two because carbon nanotube layer is directly from carbon nano pipe array, to extract and be laid immediately on the cover plate, the simple environmental protection of method helps this touch-screen is imported large-scale production.
Description of drawings
Fig. 1 is the vertical view of the capacitive touch screen that provides of first embodiment of the invention.
Fig. 2 is the cut-open view along line ∏-∏ shown in Figure 1.
Fig. 3 is the structural representation of the capacitive touch screen that provides of second embodiment of the invention.
The main element symbol description
10 capacitive touch screens
11 cover plates
12 adhesive layers
13 carbon nanotube layers
14a first drive electrode
14b second drive electrode
20 display devices
30 decorative layers
100 touch control display apparatus
The first surface of 111 cover plates
The second surface of 112 cover plates
The first side of 131 carbon nanotube layers
The second side of 132 carbon nanotube layers
150 driving circuits
152 charging circuits
154 first switches
160 sensing circuits
162 memory circuits
164 read circuit
166 second switches
Embodiment
Below will be described with reference to the accompanying drawings the capacitive touch screen of the embodiment of the invention.
See also Fig. 1 and Fig. 2, first embodiment of the invention provides a kind of capacitive touch screen 10, and this capacitive touch screen 10 comprises a cover plate 11 (Cover Glass), a transparency conducting layer, at least one first drive electrode 14a and at least one second drive electrode 14b.Said cover plate 11 have a first surface 111 and with first surface 111 opposing second surface 112.Said first surface 111 is a touch-control surface.Said transparency conducting layer is a carbon nanotube layer 13.Said carbon nanotube layer 13 directly adheres to the second surface 112 of cover plate 11 through an adhesive layer 12.Said carbon nanotube layer 13 has conduction anisotropy to define a Low ESR direction D.Carbon nanotube layer 13 has relative first side 131 and second side 132, and said Low ESR direction D is by 131 sensing second sides 132, first side.Said at least one first drive electrode 14a is arranged at first side 131, and is electrically connected with carbon nanotube layer 13.Said at least one second drive electrode 14b is arranged at second side 132, and is electrically connected with carbon nanotube layer 13.
Said cover plate 11 is the transparency carrier of a curved face type or plane.This cover plate 11 is formed by hard materials such as glass, quartz, adamas, polycarbonate, polyethylene terephthalate (PET) or plastics or flexible material.Said cover plate 11 mainly plays a part to support.In the present embodiment, cover plate 11 is a rectangle glass.
Said carbon nanotube layer 13 comprises a plurality of CNTs that are parallel to each other and axially are arranged of preferred orient along same direction.Said carbon nanotube layer 13 can be one deck carbon nano-tube film or a plurality of range upon range of carbon nano-tube film each other.When said carbon nanotube layer 13 was a plurality of each other range upon range of carbon nano-tube film, the CNT orientation in adjacent two carbon nano-tube films was identical.The direction that most of CNT in the carbon nano-tube film extends along CNT joins end to end and is axially basic along same direction preferred orientation extension.Further, this carbon nano-tube film comprises the carbon nano-tube bundle that the same direction in a plurality of edges is arranged of preferred orient, and this carbon nano-tube bundle has basic equal lengths and is arranged in continuous carbon nano tube film end to end.
Because said CNT has good electrical conductivity along the axial direction that is parallel to CNT; Therefore; The resistivity that is parallel to the axial direction of CNT wherein of carbon nanotube layer 13 is much smaller than other directions, and this direction is defined as Low ESR direction D.In the present embodiment, said first side 131 and second side 132 are perpendicular to Low ESR direction D.Carbon nanotube layer 13 perpendicular to the resistivity of the axial direction of CNT much larger than other directions, so this direction can be defined as a high impedance direction H further.In addition; Basically in the same direction each CNT joins end to end through Van der Waals force with adjacent CNT on bearing of trend in the most of CNTs that extend in the said carbon nano-tube film; And the CNT that also has the minority random alignment in the said carbon nano-tube film; The CNT of these random alignment can be in contact with one another with other adjacent CNTs; Thereby make this carbon nano-tube film still have electric conductivity at high impedance direction H, just bigger at the resistance of this high impedance direction H compared to this carbon nano-tube film of other directions, conductivity is lower.
In the present embodiment, the shape of carbon nanotube layer 13 is corresponding with the second surface 112 of said cover plate 11 with size.Said carbon nanotube layer 13 directly adheres to the second surface 112 of cover plate 11 through adhesive layer 12.
The shape that is appreciated that said carbon nanotube layer 13 can be selected according to the shape of the touch area of capacitive touch screen 10.In the present embodiment, the touch area of capacitive touch screen 10 is a rectangle, and the shape of said carbon nanotube layer 13 also is a rectangle.
The preparation method of the carbon nano-tube film in the embodiment of the invention in the carbon nanotube layer 13 mainly may further comprise the steps:
Step 1: a carbon nano pipe array is provided, and preferably, this array is ultra in-line arrangement carbon nano pipe array.
In the present embodiment; The preparation method of ultra in-line arrangement carbon nano pipe array adopts chemical vapour deposition technique, and its concrete steps comprise: a smooth substrate (a) is provided, and this substrate can be selected P type or N type silicon base for use; Or select for use the silicon base that is formed with oxide layer, present embodiment to be preferably and adopt 4 inches silicon base; (b) evenly form a catalyst layer at substrate surface, this catalyst layer material can be selected one of alloy of iron (Fe), cobalt (Co), nickel (Ni) or its combination in any for use; (c) the above-mentioned substrate that is formed with catalyst layer was annealed in 700 ℃ to 900 ℃ air about 30 minutes to 90 minutes; (d) substrate that will handle places reacting furnace, under the blanket gas environment, is heated to 500 ℃ to 740 ℃, feeds carbon-source gas then and reacts about 5 minutes to 30 minutes, and growth obtains ultra in-line arrangement carbon nano pipe array, and it highly is 200 microns to 400 microns.Should ultra in-line arrangement carbon nano-pipe array classify as a plurality of parallel and perpendicular to the pure nano-carbon tube array of the CNT formation of substrate grown.Through above-mentioned control growth conditions, do not contain impurity basically in this ultra in-line arrangement carbon nano pipe array, like agraphitic carbon or residual catalyst metal particles etc.CNT in this carbon nano pipe array closely contacts the formation array through Van der Waals force each other.
Carbon source gas can be selected the more active hydrocarbons of chemical property such as acetylene for use in the present embodiment, and blanket gas can be selected nitrogen, ammonia or inert gas for use.
Step 2: adopt a stretching tool from carbon nano pipe array, to pull and obtain a carbon nano-tube film.It specifically may further comprise the steps: (a) a plurality of CNT segments of selected certain width from above-mentioned carbon nano pipe array, present embodiment are preferably and adopt the adhesive tape contact carbon nano pipe array with certain width to select a plurality of CNT segments of certain width; (b) be basically perpendicular to these a plurality of CNT segments of carbon nano pipe array direction of growth stretching with the certain speed edge, to form a continuous carbon nano tube film.
In above-mentioned drawing process; These a plurality of CNT segments are when tension lower edge draw direction breaks away from substrate gradually; Because Van der Waals force effect; Should selected a plurality of CNT segments be drawn out continuously end to end with other CNT segments respectively, thereby form a carbon nano-tube film.
This carbon nano-tube film is the carbon nano-tube film with certain width that a plurality of carbon nano-tube bundles of being arranged of preferred orient join end to end and form.The bearing of trend of CNT is basically parallel to the draw direction of carbon nano-tube film in this carbon nano-tube film.Directly the method for stretching acquisition carbon nano-tube film is simply quick, the suitable industrial applications of carrying out.
In the present embodiment, the width of this carbon nano-tube film is relevant with the size of the substrate that carbon nano pipe array is grown, and the length of this carbon nano-tube film is not limit, and can make according to the actual requirements.Adopt 4 inches the ultra in-line arrangement carbon nano pipe array of substrate grown in the present embodiment, the width of this carbon nano-tube film can be 1 centimetre to 10 centimetres, and the thickness of this carbon nano-tube film is 0.01 micron to 100 microns.
Be appreciated that because the CNT in the ultra in-line arrangement carbon nano pipe array of present embodiment is very pure, and because the specific surface area of CNT itself is very big, so this carbon nano-tube film itself has stronger viscosity.
In addition, can with an organic solvent handle above-mentioned carbon nano-tube film.Particularly, can organic solvent be dropped in the whole carbon nano-tube film of carbon nano-tube film surface infiltration through test tube.This organic solvent is a volatile organic solvent, like ethanol, methyl alcohol, acetone, ethylene dichloride or chloroform, adopts ethanol in the present embodiment.This carbon nano-tube film is after organic solvent soaks into processing; Under the capillary effect of volatile organic solvent; Parallel CNT segment in the carbon nano-tube film can partly be gathered into carbon nano-tube bundle, and therefore, this carbon nano-tube film surface volume is than little; Inviscid, and have excellent mechanical intensity and toughness.
In addition, when this carbon nanotube layer 13 is the multilayer carbon nanotube film, can be with adhering to overlappingly on the second surface 112 of cover plate 11 according to a plurality of carbon nano-tube films of method for preparing mode along equidirectional.
Said adhesive layer 12 not only should have respectively the performance with carbon nanotube layer 13 and cover plate 11 strong bonded, also should have good transmittance and insulativity.The material of said adhesive layer 12 can be pressure sensitive adhesive, heat-sensitive glue or light-sensitive emulsion etc.Said adhesive layer 12 is formed by a pure adhesive cures.The thickness of this adhesive layer 12 should not be too thick, and is more suitable in the scope of 3 nanometer to 7 nanometers.If the thickness of adhesive layer 12 is too thick; The carbon nanotube layers 13 that then are arranged at adhesive layer 12 surface sink to the inside of adhesive layer 12 easily in the preparation process, thereby influence being electrically connected of carbon nanotube layer 13 and the first drive electrode 14a and the second drive electrode 14b.In the present embodiment, the material of this adhesive layer 12 is that ultraviolet light (UV) solidifies glue, and its coating thickness is 6 nanometers.Have the light transmission height and be easy to curing because UV solidifies glue, therefore, in the process of preparation capacitive touch screen 10, both be easy to avoid carbon nanotube layer 13 to sink to UV fully and solidified in the glue, can make carbon nanotube layer 13 and UV solidify gluing again and close firmly.In the preparation process, will be layed in the surface of cover plate 11 by the carbon nano-tube film of pulling out in the carbon nano pipe array, the surface of cover plate 11 is provided with adhesive layer 12.Carbon nano-tube film directly adheres to the surface of cover plate 11 through this adhesive layer 12.Can form carbon nanotube layer 13 through repeatedly laying carbon nano-tube film.Because carbon nanotube layer 13 directly adheres to the second surface 112 of said cover plate 11 through adhesive layer 12; Need not other carriers and reprint this carbon nanotube layer 13; Not only simplified the structure of capacitive touch screen 10; Reduce cost and thickness, also further promoted the transmittance of capacitive touch screen 10.
Said at least one first drive electrode 14a and at least one second drive electrode 14b form by conductive material, may be selected to be metal, conducting polymer, conducting resinl, metallic carbon nanotubes, indium tin oxide etc.Shape and the structure of this first drive electrode 14a or the second drive electrode 14b are not limit, and may be selected to be stratiform, strip, bulk, bar-shaped or other shape.In the present embodiment, this first drive electrode 14a and the second drive electrode 14b are the strip silver electrode.The number of the said first drive electrode 14a can be one or more.The number of the said second drive electrode 14b can be one or more.When the said first drive electrode 14a and the second drive electrode 14b are when a plurality of; Said a plurality of first drive electrode 14a is arranged in the first side along the direction that is parallel to high impedance direction H; The said a plurality of second drive electrode 14b are arranged in the spacing of these adjacent two first drive electrode 14a of second side or adjacent two second drive electrode 14b along the direction that is parallel to high impedance direction H should be moderate; If out of true when then making the position of detected touch point too greatly is preferably 1 millimeter to 5 millimeters.The length direction of this each first or second drive electrode 14a, 14b can be the high impedance direction H that is parallel to said carbon nanotube layer 13, and this length can not be oversize, oversizely also makes out of true when detecting said touch point position easily, is preferably 1 millimeter to 5 millimeters.In the present embodiment; The quantity of this first drive electrode 14a and the second drive electrode 14b is 6; The length of each the first drive electrode 14a or the second drive electrode 14b is 1 millimeter, and the spacing of these adjacent two the first drive electrode 14a or the second drive electrode 14b is 3 millimeters.These a plurality of first drive electrode 14a and these a plurality of second drive electrode 14b are oppositely arranged one by one; Perhaps interlaced setting; Be that each first drive electrode 14a is parallel with the Low ESR direction D of said carbon nanotube layer 13 with the line of one of them second drive electrode 14b, or the line of each first drive electrode 14a and any second drive electrode 14b wherein is all crossing and not parallel with the Low ESR direction D of said carbon nanotube layer 13.In the present embodiment, said a plurality of first drive electrode 14a and said a plurality of second drive electrode 14b are oppositely arranged one by one.Said each first drive electrode 14a and each second drive electrode 14b all are connected with an one drive circuit 150 and a sensing circuit 160.
Said driving circuit 150 comprises a charging circuit 152 and first switch 154 in order to control charging circuit 152.Said charging circuit 152 is connected with the said first drive electrode 14a or the second drive electrode 14b through said first switch 154.Said charging circuit 152 can be connected to a voltage source (figure does not show).Said sensing circuit 160 comprises that a memory circuit 162, reads circuit 164 and and is used for control store circuit 162 and the second switch 166 that reads circuit 164.Said memory circuit 162 is with said to read circuit 164 parallelly connected, and connects with the said first drive electrode 14a or the second drive electrode 14b through said second switch 166.Said driving circuit 150 and said sensing circuit 160 are parallel with one another.Said memory circuit 162 resistance (figure do not show) of can further connecting, this memory circuit 162 is through this resistance eutral grounding.
Selectively, in order to protect said carbon nanotube layer 13, a diaphragm 15 can be set in the surface away from cover plate 11 of said carbon nanotube layer 13.Said diaphragm 15 act as the said carbon nanotube layer 13 of temporary protection, be destroyed to avoid carbon nanotube layer 13.When said capacitive touch screen 10 is applied to specific product, peelable said diaphragm 15.When said diaphragm 15 when carbon nanotube layer 13 is peeled off, should guarantee that carbon nanotube layer 13 is not destroyed.But said diaphragm 15 is a choice structure.The material of said diaphragm 15 can be formed by hard materials such as glass, quartz, adamas or flexible materials such as plastics, resin.Particularly; When diaphragm 15 is formed by a flexible material; This material can be selected from polycarbonate (PC), polymethylmethacrylate (PMMA) or polyethylene terephthalate polyester materials such as (PET), and materials such as polyethersulfone (PES), cellulose esters, benzocyclobutene (BCB), PVC (PVC) or acryl resin.In the present embodiment, the material of this diaphragm 15 is a glass, and thickness is 2 millimeters.Be appreciated that the material that forms said diaphragm 15 is not limited to the above-mentioned material of enumerating, as long as can make diaphragm 15 play the effect of protecting carbon nanotube layer 13, all in the scope of the present invention's protection.
In the present embodiment, the principle of said capacitive touch screen 10 when using is following.The touch-control conductor can directly touch the first surface 111 formation touch points at cover plate 11.It is the coupling capacitance of C that this touch point and carbon nanotube layer 13 constitute a capacitance.The resistance value of the carbon nanotube layer 13 between this touch point and said each the first drive electrode 14a is R
1n(n=1,2,3 ... y, x, z..., n represent a plurality of first drive electrode 14a), the resistance value of the carbon nanotube layer 13 between this touch point and said each the second drive electrode 14b is R
2n(n=1,2,3...y, x, z..., n represent a plurality of second drive electrode 14b).Import a pulse signal by said driving circuit to said each first drive electrode 14a, and read the detected resistance value R of each first drive electrode 14a respectively through said sensing circuit
1nWith the product of capacitance C, i.e. R
1nThe C value, thus simulate by these a plurality of R
1nFirst curve that the C value constitutes.Judge the coordinate of said touch point on the high impedance direction H of above-mentioned carbon nanotube layer 13 through this first curve.Import a pulse signal by said driving circuit to said each second drive electrode 14b, and read the detected resistance value R of each second drive electrode 14b respectively through said sensing circuit
2nWith the product of capacitance C, i.e. R
2nThe C value, thus simulate by these a plurality of R
2nSecond curve that the C value is constituted.Judge that through this first curve the coordinate of said touch point on the high impedance direction of above-mentioned carbon nanotube layer 13 further may further comprise the steps: detect the maximal value R in this first curve
1kC, minimum value R
1xC, with minimum value R
1xThe sub-minimum R that C is adjacent
1yC and time sub-minimum R
1zC and this minimum value R
1xC, sub-minimum R
1yC and time sub-minimum R
1zC pairing coordinate Xx, Xy and Xz at high impedance direction H calculate the coordinate of said touch point in the high impedance direction through interpolation method.Judge that through this second curve and above-mentioned first curve coordinate of above-mentioned touch point on the Low ESR direction of above-mentioned carbon nanotube layer 13 further may further comprise the steps: detect minimum R in this second curve at least
2xC value and the inferior little R that is adjacent
2yThe C value, and to this R of major general
2xC value and R
2yC value sum and above-mentioned R
1xC value and R
1yC value sum is compared, and can calculate the coordinate of said touch point in the Low ESR direction.
Above-mentioned touch point can be single touch point also can be a plurality of touch points.When said touch point was a plurality of touch point, the touch point can may further comprise the steps at the coordinate of the high impedance direction H of carbon nanotube layer 13 in the time of then will judging multiple point touching: S31 detects this first curve, the detected R of the promptly different first drive electrode 14a
1nC value change curve; S32 finds a plurality of wave trough position in this first curve, detects the R of these a plurality of wave trough position at least
1nC value (minimum R
1x1C, R
1x2C ... R
1xmThe C value) reaches and these a plurality of minimum R
1x1C, R
1x2C ... R
1xmThe inferior little R that the C value is adjacent
1y1C, R
1y2... R
1ymValue is respectively with R
1xmC value and R
1ymPairing two the first drive electrode 14a of C value are at coordinate and this R of high impedance direction H
1xmC value and R
1ymThe C value is calculated through interpolation method and is obtained the coordinate of said a plurality of touch points at high impedance direction H.The coordinate of judging the pairing Low ESR direction in said touch point can comprise step: S41 following time, detects said second curve, the detected R of promptly different second drive electrodes 108
2nC value change curve; S42 finds the wave trough position in this second curve, detects the R of this wave trough position at least
2nC value (minimum R
2xThe C value) reaches and this minimum R
2xThe inferior little R that the C value is adjacent
2yThe C value, and to the major general should minimum R
2xC value and time little R
2yThe R of C value sum and above-mentioned minimum
1xC value and time little R
1yC value sum is compared
This touch point can be judged apart from the distance of first side 131 through this ratio, thereby the coordinate of said touch point can be drawn at Low ESR direction D with second side 132.
See also Fig. 3, second embodiment of the invention provides a kind of touch control display apparatus 100 of using above-mentioned capacitive touch screen 10, and this touch control display apparatus 100 comprises a touch-screen and a display device 20.Said touch-screen is the capacitive touch screen 10 of first embodiment.This display device 20 over against and be provided with near the carbon nanotube layer 13 of the capacitive touch screen 10 of first embodiment.Further, above-mentioned display device 20 and capacitive touch screen 10 a preset distance setting or integrated settings at interval.During integrated the setting, carbon nanotube layer 13 can directly be fitted through transparent insulating gel with the display surface of said display device 20 element that need not be extra is set.Said display device 20 can be in the display devices such as LCD, Field Emission Display, plasma display, electroluminescent display, vacuum fluorescent display and cathode-ray tube (CRT) a kind of.Said touch-screen 10 also can further comprise functional assembly with the touch control display apparatus 100 that display device 20 is formed, and is arranged on the first surface protection and the deckboard of said touch-screen 10 cover plates as comprising a decorative layer (Decoration Film) 30.Can comprise that for another example a polaroid or screen layer are arranged between touch-screen 10 and the display device 20 or the like.
Capacitive touch screen provided by the invention has the following advantages: one of which, only the surface that a transparency conducting layer is arranged at cover plate need be set; Utilize the special conduction anisotropy of carbon nanotube layer; Can make this touch-screen realize single touch point touch-control or multiple touch points touch-control, a plurality of transparency conducting layers need not be set.And carbon nanotube layer can be set directly on the cover plate, and is simple in structure, can significantly reduce the thickness of conventional touch screen, realizes the application of ultra-thin touch-screen.Its two because carbon nanotube layer is directly from carbon nano pipe array, to extract and be laid immediately on the cover plate, the simple environmental protection of method helps this touch-screen is imported large-scale production.
In addition, those skilled in the art also can do other variations in spirit of the present invention, and certainly, these all should be included within the present invention's scope required for protection according to the variation that the present invention's spirit is done.
Claims (11)
1. a capacitive touch screen is characterized in that, said capacitive touch screen comprises:
One cover plate, this cover plate has opposite first and second surface, and said first surface is a touch-control surface;
One carbon nanotube layer; Said carbon nanotube layer adheres to the second surface of cover plate through an adhesive layer; Said carbon nanotube layer has conduction anisotropy to define a Low ESR direction; Carbon nanotube layer has relative first side and second side, and said Low ESR direction is to point to the second side by the first side;
At least one first drive electrode is arranged at the first side of carbon nanotube layer; At least one second drive electrode is arranged at the second side of carbon nanotube layer; This at least one first drive electrode and at least one second drive electrode all are electrically connected with this carbon nanotube layer, and said at least one first drive electrode and at least one second drive electrode all are connected with an one drive circuit and a sensing circuit.
2. capacitive touch screen as claimed in claim 1 is characterized in that, the material of said adhesive layer is a kind of in pressure sensitive adhesive, heat-sensitive glue or the light-sensitive emulsion.
3. capacitive touch screen as claimed in claim 2 is characterized in that, the material of said light-sensitive emulsion is a ultraviolet cured adhesive.
4. capacitive touch screen as claimed in claim 1 is characterized in that, the thickness of said adhesive layer is 3 nanometer to 7 nanometers.
5. capacitive touch screen as claimed in claim 4 is characterized in that, the thickness of said adhesive layer is 6 nanometers.
6. capacitive touch screen as claimed in claim 1 is characterized in that, said carbon nanotube layer comprises a plurality of CNTs that are parallel to each other and axially are arranged of preferred orient along same direction.
7. capacitive touch screen as claimed in claim 6 is characterized in that, said carbon nanotube layer is one deck carbon nano-tube film at least.
8. capacitive touch screen as claimed in claim 7 is characterized in that, the thickness of said carbon nano-tube film is 0.01 to 100 micron.
9. capacitive touch screen as claimed in claim 1; It is characterized in that; Said at least one first drive electrode is a plurality of first drive electrodes; These a plurality of first drive electrode arrangement are in the first side of carbon nanotube layer, and said at least one second drive electrode is a plurality of second drive electrodes, and these a plurality of second drive electrode arrangement are in the second side of carbon nanotube layer.
10. capacitive touch screen as claimed in claim 9; It is characterized in that; The direction perpendicular to the Low ESR direction of said carbon nanotube layer is defined as the high impedance direction; Said a plurality of first drive electrode is arranged in the first side along the direction that is parallel to the high impedance direction, and said a plurality of second drive electrodes are arranged in the second side along the direction that is parallel to the high impedance direction.
11., it is characterized in that said a plurality of first drive electrodes and a plurality of second drive electrode are for be oppositely arranged one by one like claim 9 or 10 described capacitive touch screens.
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| CN201010573894.5A CN102479015B (en) | 2010-11-26 | 2010-11-26 | Capacitive touch screen |
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| CN102479015B CN102479015B (en) | 2015-04-08 |
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| CN102479015B (en) | 2015-04-08 |
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