TFT-LCD Panel产品及生产流程介绍-英文版(ppt 32页).ppt

,產品:TFT-LCDPanel,TFT-Array,Cell,Module,液晶,DisplayTechnology:CRTvsAMLCD,CRTAdvantage:LowcostperpixelandhighqualityofdisplayApplications:TV,computer,oscilloscopeandmeasuringdevicesMarket:1993:11billions1998:18billionsDisadvantage:Environmentalandsafetyissues,AMLCDAdvantage:thin,light-weighted,andlowpowerconsumptionApplications:portable&compactsystemsandHDTVMarket:19932billions199810-15billionsDisadvantage:cost,largeupfrontinvestmentandmanufacturingdifficulties,TFT-basedActiveMatrixLCDs(AMLCD),InanAMLCDdisplay,eachpixelhasaTFT.Thegateisattachedtoahorizontalrowelectrodeandthedrainisattachedtoaverticalcolumnelectrode.ThesourceisattachedtotheLCelectrode.Thedisplayisactivatedonerowatatime,byactivatingthegatelines.Thecolumnelectrodescarrythedatavoltages.WhenaTFTisturnedon,thedatalinechargesuptheLCcapacitortotheappropriatevoltage.ThentheTFTisturnedoff,sothatthechargeisheldonthecapacitoruntilthenextrefreshtime.(Typicalrefreshratesare60-70Hz)ThedatavoltageisisolatedfromtheotherrowsofthedisplaybytheTFT,sothatcrosstalkisverylow,evenwhenthenumberofrowsislarge.Theoveralleffectisalmostthesameasbeingabletocontrolthevoltageateachpixels.Thus,anypointonthetransmissioncurveisaccessible,leadingtogoodON/OFFcontrastandgoodgrayscalecontrol.,TFT-basedActiveMatrixLCDs(AMLCD),LiquidCrystalOperation,LCsandwichedbetweenglassplates,whicharerubbedatrightanglestoaligntheLCmolecules.Polarizersalignedperpendicularlyoneitherside.Withnovoltageappliedacrossthepixel,theLCmoleculestwisttoaligntotherubbingoftheglassplates.Lightenteringthefirstpolarizeristwistedandcanexitthesecondpolarizer-pixelisONWithavoltageappliedacrossthepixel,theLCmoleculesuntwisttoalignwiththeelectricfield.Lightenteringthefirstpolarizercannotexitthesecondpolarizer-pixelisOFF.,LiquidCrystalPixel:ON,Polarizer1(Vertical),Polarizar2(Horizontal),HorizontallyPolarizedLightOut,UnpolarizedLightIn,LiquidCrystal,Noappliedvoltage:opticalpolarizationfollowstwistofLCmolecules,LiquidCrystalPixel:OFF,Polarizer1(Vertical),Polarizar2(Horizontal),NoLightOut,UnpolarizedLightIn,LiquidCrystal,appliedvoltage:LCmoleculestoisotropic.,QualitativeComparison,Crystalline,Polysilicon,Amorphous,Relativesizes,TFT-LCDPixelTopView,GatemetalDatametalITO,CSstoragecapa