CN106325630A - Graphene multi-point touching capacitive touch screen - Google Patents
Graphene multi-point touching capacitive touch screen Download PDFInfo
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- CN106325630A CN106325630A CN201510394746.XA CN201510394746A CN106325630A CN 106325630 A CN106325630 A CN 106325630A CN 201510394746 A CN201510394746 A CN 201510394746A CN 106325630 A CN106325630 A CN 106325630A
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Abstract
The invention discloses a graphene multi-point touching capacitive touch screen. The graphene multi-point touching capacitive touch screen comprises a display module, an optical adhesive layer, a polarizer, a graphene transparent conductive layer, and a protective layer in sequence from bottom to top; the polarizer and the display module are bonded through the optical adhesive layer; the display module is electrically connected with the flexible circuit board of the display module; the polarizer and the graphene transparent conductive layer are bonded through a solidifiable bonding layer which is arranged on the polarizer layer. The graphene transparent conductive layer mentioned in the invention has good conductivity, high visible light transmittance and strong adhesive force; and the raw materials are simple, easy to get, low in cost and simple in technological process; and the total product yield of the touch screen manufactured through the materials is high.
Description
Technical field
The present invention relates to capacitance-type touch screen technology field, be specifically related to a kind of Graphene multi-point touch capacitive touch screen.
Background technology
Touch screen is a kind of input equipment, it is possible to conveniently realize people and computer and the reciprocal action of other portable mobile apparatus.And multiple point touching technology, a touch screen (screen, desktop, wall etc.) or Trackpad can be constituted, accept multiple points on screen simultaneously and carry out the man-machine interactive operation of computer.User can carry out single-touch by both hands, can also be to click, to double-click, to translate, to press, to roll and the different gestures such as rotation touch screens, realize indiscriminately ad. as one wishes manipulating, thus better and more comprehensively understand the correlated characteristic (word, video recording, picture, defend the information such as sheet, three-dimensional simulation) of object.
The most popular capacitive touch screen structure comprises the compositions such as (glass) substrate, transparency conductive electrode layer, edge electrodes trace layer.Transparency conducting layer required for transparency conductive electrode layer is TCO, its resistivity needing to possess the 10-4 Ω cm order of magnitude.Generally, substrate and the transparency conductive electrode lamination that is attached on substrate are referred to as transparent conductive film layer.But in actual applications, touch screen based on graphene film cannot apply such as the complex patterns such as argyle design by the way of patterning the operations such as laggard row metal bridging by electrode film layer, if using monolayer complex pattern such as caterpillar figure, laser meticulous depiction process yields is the lowest, the most long, therefore simple triangle pattern can only be used to carry out single-point touch, it is impossible to realize multi-point touch function, seriously limit the Graphene application in touch screen field.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, it is provided that a kind of Graphene multi-point touch capacitive touch screen.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of Graphene multi-point touch capacitive touch screen, it includes: the display module that from bottom to top sets gradually, optical cement layer, polaroid, Graphene transparency conducting layer, protective layer；Described polaroid is bonding with display module by optical cement layer；Described display module electrically connects with display module flexible circuit board；Being provided with curable adhesive linkage on described polarizing layer, described polaroid is bonding by curable adhesive linkage with described Graphene transparency conducting layer；Line layer is formed by silk-screened conductive slurry on described Graphene transparency conducting layer；It is provided with including transparent conducting oxide layer on described Graphene transparency conducting layer；Described line layer surrounding is provided with electrode layer, and this electrode layer is formed by silver pulp material printing, and this electrode layer is in order to draw this line layer；Described Graphene transparency conducting layer is fitted in the same direction by the first inductive layer and the second inductive layer and is formed；Described first inductive layer has the pattern extended in a first direction, and described second inductive layer has the pattern extended in a second direction.
Further technical scheme is that curable adhesive linkage includes that curing materials, described curing materials are epoxy resin, polyurethane, acrylate, methacrylate, modification acrylate, urethane acrylate, polystyrene, one or more combination of polyvinyl alcohol.
Further technical scheme be the thickness of transparent conductive oxide film layer be 50 to 200nm；The material of described transparent conductive oxide film layer is selected from AZO thin film or FTO film.
Further technical scheme be electrocondution slurry be carbon slurry or metal conductive paste.
Further technical scheme is that line layer includes capacitance sensing circuit, sensing node is coupled to capacitance sensing circuit, capacitance sensing circuit includes multiplexer, analog-digital converter and digital signal processor, multiplexer is for receiving and store the signal of each sensing node, and by an output channel release signal successively, the signal that multiplexer discharges is converted to digital signal by analog-digital converter, digital signal processor receives the digital signal of analog-digital converter conversion, and filter noise, calculate touch coordinate.
Further technical scheme be protective layer be glass or PET film or TCO.
Compared with prior art, the invention has the beneficial effects as follows: the polaroid after the present invention has electroplated Graphene circuit is composition material and the composition material of touch screen of display screen, is greatly reduced the thickness of screen assembly, is truly realized ultra-thin.Achieve the multi-point touch function of Graphene capacitance touch screen；Significantly reduce the production cost of touch screen；Avoid in the course of processing, the damage caused because of PET base material bending；And Graphene transparency conducting layer conducts electricity very well, visible light transmissivity high, adhesive force is good, and raw material is simple and easy to get, low cost, and technological process is simple, and the integral product yield of the touch screen prepared is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, in addition to mutually exclusive feature and/or step, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be by other equivalences or there is the alternative features of similar purpose replaced.I.e., unless specifically stated otherwise, an example during each feature is a series of equivalence or similar characteristics.
Below in conjunction with the accompanying drawings and the detailed description of the invention of the present invention is described in detail by embodiment.
As shown in Figure 1; according to one embodiment of present invention; the open a kind of Graphene multi-point touch capacitive touch screen of the present embodiment, concrete, it includes: be from bottom to top followed successively by display module 7, optical cement layer 6, polaroid 5, Graphene transparency conducting layer 3, protective layer 1；Concrete, protective layer is glass or PET film or TCO.The visible light transmissivity of TCO is high, is deposited on graphene film, not only serves the effect of protection Graphene transparency conducting layer, also overcomes prior art and selects the problem that PET protection Graphene transparency conducting layer visible light transmissivity is low.
Polaroid is bonding with display module by optical cement layer；Display module electrically connects with display module flexible circuit board；Being provided with curable adhesive linkage 4 on polarizing layer, polaroid is fitted by curable adhesive linkage with Graphene transparency conducting layer；Curable adhesive linkage includes curing materials, and curing materials is epoxy resin, polyurethane, acrylate, methacrylate, modification acrylate, urethane acrylate, polystyrene, one or more combination of polyvinyl alcohol.
Line layer is formed by silk-screened conductive slurry on Graphene transparency conducting layer；Using screen printing method to make Graphene electrodes, technique is simple, and cost of manufacture is relatively low, product yield is high；Concrete, line layer includes capacitance sensing circuit, sensing node is coupled to capacitance sensing circuit, capacitance sensing circuit includes multiplexer, analog-digital converter and digital signal processor, and multiplexer is for receiving and store the signal of each sensing node, and passes through an output channel release signal successively, the signal that multiplexer discharges is converted to digital signal by analog-digital converter, digital signal processor receives the digital signal of analog-digital converter conversion, and filters noise, calculates touch coordinate.The present embodiment uses grapheme material to instead of ITO material, is used for making capacitive touch screen, has collapsible, high sensitivity, frivolous, high transmission rate, high conductivity, low cost, the advantage of environmental protection.Sensing node is defined between 2 of transverse intersection between the two-layer of Graphene transparency conducting layer, make to constitute capacitance structure between two-layer graphene layer, static electricity on human body is by siphoning away the electric current of electric capacity storage, the electric current siphoned away flows into capacitance sensing circuit from sensing line, processes the position coordinates being calculated touch point.Graphene transparency conducting layer includes multiple conductive area, and what mutually isolated conductive area can be independent works for touch sensing, so the touch screen produced has the function of multi-point touch.
Further, Graphene transparency conducting layer is provided with including transparent conducting oxide layer 2；The thickness of transparent conductive oxide film layer is 50 to 200nm；The material of transparent conductive oxide film layer is selected from AZO thin film or FTO film.Grapheme material and TCO material (such as AZO, FTO material) are be combined with each other, reaches reducing TCO film layer resistivity; while keeping high transmission rate; improve the tack of transparent conductive film layer, and grapheme material is protected in time, it is to avoid the problem of Graphene destruction easy to fall off.Graphene/TCO film layer structure that the present invention provides can simultaneously laser grooving and scribing, it is possible to protect film layer entirety in time.Line layer surrounding is provided with electrode layer, and this electrode layer is formed by silver pulp material printing, and this electrode layer is in order to draw this line layer.
Further preferred embodiment is, Graphene transparency conducting layer is fitted in the same direction by the first inductive layer and the second inductive layer and formed；Described " in the same direction laminating " be meant that the first inductive layer and the second inductive layer are all to overlap with structure " metallic film/transparent graphene conductive film/substrate ".First inductive layer has the pattern extended in a first direction, and the second inductive layer has the pattern extended in a second direction.The method of Graphene pattern for transparent conductive layer is preferably: first large-area Graphene is transferred on single substrate, then by photoetching, the method for etching, etches the Graphene of required patterning.Described laser ablation uses laser direct-writing formula etching.So-called laser direct-writing, it is simply that utilize the laser beam of intensity variable that the erosion resistant being coated in substrate surface is become dose exposure, form required profile on resist layer surface after development.It achieves the multi-point touch function of Graphene capacitance touch screen；Significantly reduce the production cost of touch screen；Avoid in the course of processing, the damage caused because of PET base material bending；Avoiding the gold-tinted processing procedure of complexity, high cost, in window touch area sensing electrode pattern forming process, add reactive ion etching only with laser direct-writing etching or metal mask, processing technology is convenient and swift, efficient.
The present invention illustrates detailed process equipment and the technological process of the present invention by above-described embodiment, but the invention is not limited in above-mentioned detailed process equipment and technological process, i.e. do not mean that the present invention has to rely on above-mentioned detailed process equipment and technological process could be implemented.Person of ordinary skill in the field is it will be clearly understood that any improvement in the present invention, and the equivalence of raw material each to product of the present invention is replaced and the interpolation of auxiliary element, concrete way choice etc., within the scope of all falling within protection scope of the present invention and disclosure.
Claims (6)
1. a Graphene multi-point touch capacitive touch screen, it is characterised in that: it includes: the display module that from bottom to top sets gradually, optical cement layer, polaroid, Graphene transparency conducting layer, protective layer；Described polaroid is bonding with display module by optical cement layer；Described display module electrically connects with display module flexible circuit board；Being provided with curable adhesive linkage on described polarizing layer, described polaroid is bonding by curable adhesive linkage with described Graphene transparency conducting layer；Line layer is formed by silk-screened conductive slurry on described Graphene transparency conducting layer；It is provided with including transparent conducting oxide layer on described Graphene transparency conducting layer；Described line layer surrounding is provided with electrode layer, and this electrode layer is formed by silver pulp material printing, and this electrode layer is in order to draw this line layer；Described Graphene transparency conducting layer is fitted in the same direction by the first inductive layer and the second inductive layer and is formed；Described first inductive layer has the pattern extended in a first direction, and described second inductive layer has the pattern extended in a second direction.
Graphene multi-point touch capacitive touch screen the most according to claim 1, it is characterized in that described curable adhesive linkage includes that curing materials, described curing materials are epoxy resin, polyurethane, acrylate, methacrylate, modification acrylate, urethane acrylate, polystyrene, one or more combination of polyvinyl alcohol.
Graphene multi-point touch capacitive touch screen the most according to claim 1, it is characterised in that the thickness of described transparent conductive oxide film layer is 50 to 200nm；The material of described transparent conductive oxide film layer is selected from AZO thin film or FTO film.
Graphene multi-point touch capacitive touch screen the most according to claim 1, it is characterised in that described electrocondution slurry is carbon slurry or metal conductive paste.
Graphene multi-point touch capacitive touch screen the most according to claim 1, it is characterized in that described line layer includes capacitance sensing circuit, sensing node is coupled to capacitance sensing circuit, capacitance sensing circuit includes multiplexer, analog-digital converter and digital signal processor, multiplexer is for receiving and store the signal of each sensing node, and by an output channel release signal successively, the signal that multiplexer discharges is converted to digital signal by analog-digital converter, digital signal processor receives the digital signal of analog-digital converter conversion, and filter noise, calculate touch coordinate.
Graphene multi-point touch capacitive touch screen the most according to claim 1, it is characterised in that described protective layer is glass or PET film or TCO.
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| CN107479769A (en) * | 2017-09-26 | 2017-12-15 | 鹤山市意达电子薄膜器件有限公司 | One kind uses self-luminous touch control panel made of thin-film light emitting circuit |
| CN107765928A (en) * | 2017-04-21 | 2018-03-06 | 青岛陶知电子科技有限公司 | A kind of multi-touch display system based on graphene optical sensing technology |
| CN108490040A (en) * | 2018-02-23 | 2018-09-04 | 天智羲王管道科技有限公司 | Graphene gas is printed on one side capacitive sensing structure |
| CN109901742A (en) * | 2019-01-31 | 2019-06-18 | 深圳市骏达光电股份有限公司 | A kind of flexibility touch module and preparation method thereof |
| CN114155991A (en) * | 2021-11-05 | 2022-03-08 | 云南巨晶新材料有限公司 | Silver paste graphene composite conductive paste for transparent display screen |
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