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1、In-Cell触摸屏原理2010.3.15Introductionoftouchpanel1.Resistivetouchpanel1.1traditionalresistivetouchpanel(directlyglueonLCDmodule)a.4/5/6/8-wireresistivetouchpanelb.digitalresistivetouchpanel(touchswitches,matrix)1.2integrateresistivetouchpanelintoLCDcell(betweentopandbottomglasses)2.Capacitivetouchpanel2
2、.1capacitancechangedbydeformationoftopglass2.2capacitancechangedbyinducedcurrenittrorfinger2.2.1surfacecapacitivetouchpanel2.2.2projectivecapacitivetouchpanel2.2.2.1detectselfcapacitance2.2.2.2detectmutualcapacitance3.Othertouchpanel(Infrared,SAW,Electromagnetic,Optical.)Resistivetouchpanel基本原理=用s唰岫
3、胁触摸时,两层ITO互相接目-触,从而在两层ITO之间形成电际通路应Plsiocfin根据上下基板材料,可_分为flmonglass,glasslLonglass,flmonfilm等结构。一1.14-wireresistivetouchpanel在两电极上加5V直流电在ITO均匀电阻平面上形成均匀稳恒电流抨在另一面的ITC电极上测量电压1根据测得电压值(0-5V)确定触摸点的位置用同样方法测量Y坐标1.1_4-wireresistivetouchpanelLowlifetime(around1milliontimes)Lowtransmissivity(75%-85%)Notresistsc
4、ratchLowestcostEasydetectcircuitWorkswithanystylus1.2Incellresistivetouchpanel-SamSUng(1)*“Basicprinciple:Whenpressed,thesensorswitchison(conductivecolumnspacercontactsensorelectrode)FromplanviewattouchpointcommonelectrodecontacttwosensinglinesperpendicularwitheachotherrespectivelyManCSColorfilergla
5、ss3目一L0|东仪留余界余人余人人eCa)eTFTaSensorSwtchgaSS(ConductveCS)*2.Capacitivetouchpane|2.1capacitancechangedbydeformationoftopglass2.2capacitancechangedbyinducedcurrentfromfinger2.2.1surfacecapacitiyetouchpahiei2.2.2projectivecapacitivetouchpanel2.2.2.1detectselfcapacitance2.2.2.2detectmutualcapacitance2.1Ca
6、pacitivetouchpanel(压力式)ThisintegratetypehassomePisdifferentstructures,includes:“二“CellgapchangetypeSamsungfiledapatent(US20080048994).AUOhasmadeademo.LCalignmentchangetypeSamsungfiledpatent(US20050094038)verysarly;butSamsungsdemoappliedanotherdetectcircuit(SID0724.3),andEpsonmadeademossxoorrmmmcrma(
7、SID0855.2)basedonSamsungsstructurebyusingLTPS,IPSandactivematrixSensorsothatimprovedtheperformance.Cellgapchangetype(1)Samsungspatent(US20080048994)onlyposedabasicprincipleitslayerstructureanddetaileddetectmethodisnotshowninthepatentThoughAUOhasmadeademo,thereareveryfewopenmaterialsofitsdetectprincipleTheyusethesameprinciple:detectthecapacitancechangebetweencommonelectrodeandsenseelectrodebycellgapdeformation.Therearemanywaystodetectcapacitancechange,whichwaySamsungandAUOusedisunknown.“AUO积LG的压力式内婿触摸牺棵品E河UAUo
