CN103279239A - Grapheme capacitive touch screen - Google Patents
Grapheme capacitive touch screen Download PDFInfo
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- CN103279239A CN103279239A CN2013101982690A CN201310198269A CN103279239A CN 103279239 A CN103279239 A CN 103279239A CN 2013101982690 A CN2013101982690 A CN 2013101982690A CN 201310198269 A CN201310198269 A CN 201310198269A CN 103279239 A CN103279239 A CN 103279239A
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Abstract
The invention relates to the field of touch screens of the electronic information technology, in particular to a grapheme capacitive touch screen. The grapheme capacitive touch screen comprises a transparent film layer I and a transparent film layer II. A grapheme layer I and a grapheme layer II are arranged on the surface of the transparent film layer I and the surface of the transparent film layer II respectively. The grapheme layer II is adhered to the surface of the transparent film layer I. A voltage source is arranged on the grapheme layer I or the grapheme layer II. Sense lines are arranged on the grapheme layer I or the grapheme layer II. ITO materials are replaced by grapheme materials which are used for manufacturing the capacitive touch screen. The grapheme capacitive touch screen has the advantages of being foldable, high in sensitivity, light, thin, high in light penetrating rate, high in electricity conducting rate, low in cost, green and friendly to environment.
Description
Technical field
The present invention relates to a kind of electronic information technology touch-screen field, particularly a kind of capacitive touch screen.
Background technology
Touch-screen is called contact panel again, is simple, convenient, the most natural present a kind of man-machine interaction mode.Touch screen is the induction type liquid crystal indicator that can receive input signals such as contact, when having contacted the graphic button on the screen, haptic feedback system on the screen can drive various hookup mechanisms according to the formula of programming in advance, smooth screen touch-control is experienced and button interfaces design allows touch-screen replace the partial function of mouse-keyboard gradually, and produces lively visual and sound effects by liquid crystal display picture.
Present several touch screen technologies of development generally are divided into four big classes at present according to its principle of work: resistive touch screen, capacitive touch screen, infrared-type touch-screen and surface acoustic wave touch screen, widespread use be resistive touch screen and capacitive touch screen.Touch-screen in the market, main composition material are the ITO transparent conductive material.Along with the application of touch screen technology on panel computer and smart mobile phone is increasingly mature, Zhu Dao ITO touch screen technology faces the test of bottleneck day by day in the market.Major defect is as follows: color is yellow partially, conductivity is lower, easily crisp, unstable chemcial property, poisonous, rise day by day because of the very rare price of indium.
Graphene is made of the monoatomic layer flat film of hexangle type lattice with the sp2 hybrid orbital carbon atom, as a kind of novel semiconductor material, the advantages such as novel electrode that have high transmission rate, high conductivity, low cost, high stability, environmental protection and can prepare at various substrates.
Summary of the invention
Purpose of the present invention just provides a kind of Graphene capacitive touch screen, and it can replace the ITO capacitive touch screen, has the advantage of collapsible, high sensitivity, frivolous, high transmission rate, high conductivity, low cost, environmental protection.
The objective of the invention is to realize by such technical scheme, it includes transparent thin film layer I and transparent thin film layer II, be respectively arranged with graphene layer I and graphene layer II on the surface of transparent thin film layer I and transparent thin film layer II, the graphene layer II is bonded in the surface of transparent thin film layer I, graphene layer I or graphene layer II are provided with voltage source, and graphene layer II or graphene layer I are provided with sense line.
Further, all data plate has the electrical isolation circuit on graphene layer I and graphene layer II, the electrical isolation circuit is divided into a plurality of conductive area with graphene layer, the position of the conductive area transverse intersection of the conductive area of graphene layer I and graphene layer II is sensing node, is provided with voltage source or sense line in each conductive area.
Further, described graphene layer I is split into many mutual equidistant and parallel horizontal strip conductive area, and the graphene layer II is split into many mutually equidistantly and the longitudinal strip conductive area of equality.
Further, described graphene layer I and graphene layer II include a plurality of quadrilateral conduction units that are made of Graphene, the conduction unit of graphene layer I and graphene layer II is multiple lines and multiple rows and equidistantly arranges, the conduction unit of graphene layer I is positioned on the electrical isolation circuit of graphene layer II, the same biographies of graphene layer I are led between the unit and are connected by Graphene, each row interconnects the conductive area that conduction unit has constituted a graphene layer I, connect by Graphene between the same delegation conduction unit of graphene layer II, the interconnective conduction unit of each row has constituted the conductive area of a graphene layer II.
Further, described touch-screen also includes the capacitance sensing circuit, sensing node is coupled to the capacitance sensing circuit, the capacitance sensing circuit includes multiplexer, analog to digital converter and digital signal processor, and multiplexer is used for receiving and storing the signal of each sensing node, and by output channel release signal successively, analog to digital converter is converted to digital signal with the signal that multiplexer discharges, digital signal processor receives the digital signal of analog to digital converter conversion, and filtering noise, calculates touch coordinate.
Further, all scribble protection glue in graphene layer I and graphene layer II surface.
Further, described graphene layer I and graphene layer II all adopt pure Graphene, doped graphene or with the Graphene of metal grill.
Further, described graphene layer I and the equal earthing of graphene layer II shifting process are transferred to respectively on transparent thin film layer I and the transparent thin film layer II.
Owing to adopted technique scheme, the present invention to have following advantage:
The present invention adopts grapheme material to replace the ITO material, be used for to make capacitive touch screen, has the advantage of collapsible, high sensitivity, frivolous, high transmission rate, high conductivity, low cost, environmental protection.Between graphene layer I and the graphene layer II layer of transparent film is arranged, formed sensing node between two of transverse intersection between two-layer, make between the two-layer graphene layer and constituted capacitance structure, the static electricity on human body is by siphoning away the electric current of capacitance stores, the electric current that siphons away flows into the capacitance sensing circuit from sense line, handles to calculate the touch point position coordinate.Graphene layer I and graphene layer II include a plurality of conductive area respectively, and the conductive area of isolating can independently be used for touch sensing work mutually, so the touch-screen of producing has function of multi-spot touch.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can obtain instruction from the practice of the present invention.Target of the present invention and other advantages can realize and obtain by following instructions and claims.
Description of drawings
Description of drawings of the present invention is as follows.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
A kind of Graphene capacitive touch screen, as shown in Figure 1, include transparent thin film layer I and transparent thin film layer II, be respectively arranged with graphene layer I and graphene layer II on the surface of transparent thin film layer I and transparent thin film layer II, the graphene layer II is bonded in the surface of transparent thin film layer I, graphene layer I or graphene layer II are provided with voltage source, and graphene layer II or graphene layer I are provided with sense line.
All data plate has the electrical isolation circuit on graphene layer I and graphene layer II, the electrical isolation circuit is divided into a plurality of conductive area with graphene layer, the position of the conductive area transverse intersection of the conductive area of graphene layer I and graphene layer II is sensing node, is provided with voltage source or sense line in each conductive area.
As shown in Figure 2, graphene layer I and graphene layer II include a plurality of quadrilateral conduction units that are made of Graphene, the conduction unit of graphene layer I and graphene layer II is multiple lines and multiple rows and equidistantly arranges, the conduction unit of graphene layer I is positioned on the electrical isolation circuit of graphene layer II, the same biographies of graphene layer I are led between the unit and are connected by Graphene, each row interconnects the conductive area that conduction unit has constituted a graphene layer I, connect by Graphene between the same delegation conduction unit of graphene layer II, the interconnective conduction unit of each row has constituted the conductive area of a graphene layer II.
Carry out excision forming with pure Graphene, doped graphene or with the flexible transparent conductive film of metal grill, adopt photoetching and silk-screen technology that two-layer graphene layer is carved many electrical isolation circuits respectively, circuit on the different layers is orthogonal basically, thereby forms a plurality of electrical isolation electrodes and the electrode trace of graphene layer.Although graphene layer I and graphene layer II lay respectively on the different layers, the conductor wire crosscut that Graphene constitutes, intersection or crossing, thus forming a capacitive coupling node, each capacitive coupling node has independent track, is coupled to the electric capacity supervisory circuit.
At last, form the Graphene capacitive touch screen with adopting bonding coat to be attached together encapsulation between each layer respectively, the graphene layer of this touch-screen is moulded to one group of space split circuit on two different layers, voltage source is on the graphene layer I, and sense line is on the graphene layer II, thereby the transversal conductive area of passing of sense line constitutes the capacitance sensing node, sense line is connected to the capacitance sensing circuit, conductive area of the each driving of voltage source, because capacitive coupling, electric current on the conductive area is sent to each capacitance sensing node of sense line, the capacitance variations that on each capacitance sensing node of capacitance sensing circuit supervision, occurs, the position of variation and the amplitude of these variations occur, be used for identification multiple point touching event.
Described touch-screen also includes the capacitance sensing circuit, sensing node is coupled to the capacitance sensing circuit, the capacitance sensing circuit includes multiplexer, analog to digital converter and digital signal processor, multiplexer is used for receiving and storing the signal of each sensing node, and by output channel release signal successively, analog to digital converter is converted to digital signal with the signal that multiplexer discharges, and digital signal processor receives the digital signal of analog to digital converter conversion, and filtering noise, calculate touch coordinate.
The present invention adopts grapheme material to replace the ITO material, be used for to make capacitive touch screen, has the advantage of collapsible, high sensitivity, frivolous, high transmission rate, high conductivity, low cost, environmental protection.Between graphene layer I and the graphene layer II layer of transparent film is arranged, formed sensing node between two of transverse intersection between two-layer, make between the two-layer graphene layer and constituted capacitance structure, the static electricity on human body is by siphoning away the electric current of capacitance stores, the electric current that siphons away flows into the capacitance sensing circuit from sense line, handles to calculate the touch point position coordinate.Graphene layer I and graphene layer II include a plurality of conductive area respectively, and the conductive area of isolating can independently be used for touch sensing work mutually, so the touch-screen of producing has function of multi-spot touch.
Described graphene layer I and graphene layer II all adopt pure Graphene, doped graphene or have the Graphene of metal grill.
Pure Graphene:
Adopt chemical vapour deposition technique, under the condition of gaseous carbon sources and protection gas at the substrate Graphene of growing; To be grown in suprabasil Graphene and transfer on the flexible and transparent film, obtain the Graphene flexible transparent conductive film, by a bonding coat Graphene and flexible and transparent film will be attached together.
Doped graphene:
Adopt chemical vapour deposition technique, under the condition of gaseous carbon sources and protection gas at the substrate Graphene of growing; To be grown in suprabasil Graphene and transfer on the flexible and transparent film,, by a bonding coat Graphene and flexible and transparent film are attached together, obtain the Graphene flexible transparent conductive film.The Graphene flexible transparent conductive film is soaked doping or carries out the metal nanoparticle doping in the solution that contains chemical doping reagent, obtain the doped graphene flexible transparent conductive film.
Graphene with metal grill:
Adopt technology such as photoetching, etching to make the metal grill structure in the transparent insulation substrate; adopt chemical vapour deposition technique; under the condition of gaseous carbon sources and protection gas at the substrate Graphene of growing; and Graphene is transferred to flexible and transparent film substrate with metal grill, by a bonding coat Graphene and flexible and transparent film are attached together.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. Graphene capacitive touch screen, it is characterized in that: described touch-screen includes transparent thin film layer I and transparent thin film layer II, be respectively arranged with graphene layer I and graphene layer II on the surface of transparent thin film layer I and transparent thin film layer II, the graphene layer II is bonded in the surface of transparent thin film layer I, graphene layer I or graphene layer II are provided with voltage source, and graphene layer II or graphene layer I are provided with sense line.
2. Graphene capacitive touch screen as claimed in claim 1, it is characterized in that: all data plate has the electrical isolation circuit on graphene layer I and graphene layer II, the electrical isolation circuit is divided into a plurality of conductive area with graphene layer, the position of the conductive area transverse intersection of the conductive area of graphene layer I and graphene layer II is sensing node, is provided with voltage source or sense line in each conductive area.
3. Graphene capacitive touch screen as claimed in claim 2, it is characterized in that: described graphene layer I is split into many mutual equidistant and parallel horizontal strip conductive area, and the graphene layer II is split into many mutually equidistantly and the longitudinal strip conductive area of equality.
4. Graphene capacitive touch screen as claimed in claim 2, it is characterized in that: described graphene layer I and graphene layer II include a plurality of quadrilateral conduction units that are made of Graphene, the conduction unit of graphene layer I and graphene layer II is multiple lines and multiple rows and equidistantly arranges, the conduction unit of graphene layer I is positioned on the electrical isolation circuit of graphene layer II, the same biographies of graphene layer I are led between the unit and are connected by Graphene, each row interconnects the conductive area that conduction unit has constituted a graphene layer I, connect by Graphene between the same delegation conduction unit of graphene layer II, the interconnective conduction unit of each row has constituted the conductive area of a graphene layer II.
5. Graphene capacitive touch screen as claimed in claim 2, it is characterized in that: described touch-screen also includes the capacitance sensing circuit, sensing node is coupled to the capacitance sensing circuit, the capacitance sensing circuit includes multiplexer, analog to digital converter and digital signal processor, multiplexer is used for receiving and storing the signal of each sensing node, and by output channel release signal successively, analog to digital converter is converted to digital signal with the signal that multiplexer discharges, digital signal processor receives the digital signal of analog to digital converter conversion, and filtering noise, calculate touch coordinate.
6. Graphene capacitive touch screen as claimed in claim 1 is characterized in that: all scribble protection glue in graphene layer I and graphene layer II surface.
7. Graphene capacitive touch screen as claimed in claim 1 is characterized in that: described graphene layer I and graphene layer II all adopt pure Graphene, doped graphene or with the Graphene of metal grill.
8. Graphene capacitive touch screen as claimed in claim 1, it is characterized in that: described graphene layer I and the equal earthing of graphene layer II shifting process are transferred to respectively on transparent thin film layer I and the transparent thin film layer II.
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Cited By (9)
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| CN103984457A (en) * | 2014-05-06 | 2014-08-13 | 无锡格菲电子薄膜科技有限公司 | Double-layer capacitive touch screen and preparation method thereof |
| CN104020919A (en) * | 2014-05-20 | 2014-09-03 | 深圳市航泰光电有限公司 | Graphene capacitive type touch screen and production and manufacturing method thereof |
| CN104375709A (en) * | 2014-12-03 | 2015-02-25 | 京东方科技集团股份有限公司 | Touch electrode, touch electrode manufacturing method, touch screen and display device |
| CN104965616A (en) * | 2015-06-29 | 2015-10-07 | 重庆墨希科技有限公司 | Preparation method for graphene touch screen |
| CN103838448B (en) * | 2014-02-18 | 2016-08-31 | 中国科学院重庆绿色智能技术研究院 | A kind of integrated OLED touch-screen display based on Graphene |
| CN106325630A (en) * | 2015-07-08 | 2017-01-11 | 江苏吉创光电有限公司 | Graphene multi-point touching capacitive touch screen |
| CN106484205A (en) * | 2016-12-27 | 2017-03-08 | 无锡格菲电子薄膜科技有限公司 | A kind of mutual capacitance touchscreens functional sheet and preparation method thereof |
| CN106775168A (en) * | 2017-01-18 | 2017-05-31 | 刘肖俊 | A kind of high sensitivity grapheme capacitive touch screen |
| WO2018039939A1 (en) * | 2016-08-30 | 2018-03-08 | 华为技术有限公司 | Capacitive pressure sensor and fabrication method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018039939A1 (en) * | 2016-08-30 | 2018-03-08 | 华为技术有限公司 | Capacitive pressure sensor and fabrication method thereof |
| CN108291845A (en) * | 2016-08-30 | 2018-07-17 | 华为技术有限公司 | Capacitance pressure transducer, and preparation method thereof |
| CN106484205A (en) * | 2016-12-27 | 2017-03-08 | 无锡格菲电子薄膜科技有限公司 | A kind of mutual capacitance touchscreens functional sheet and preparation method thereof |
| CN106484205B (en) * | 2016-12-27 | 2024-01-26 | 常州第六元素半导体有限公司 | Mutual capacitance touch screen functional sheet and preparation method thereof |
| CN106775168A (en) * | 2017-01-18 | 2017-05-31 | 刘肖俊 | A kind of high sensitivity grapheme capacitive touch screen |
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