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1、產品:TFT-LCDPanelTFT-ArrayCellModule液晶DisplayTechnology:CRTvsAMLCDCRTAdvantage:LowcostperpixelandhighqualityofdisplayApplications:TV,computer,oscilloscopeandmeasuringdevicesMarket:1993:11billions1998:18billionsDisadvantage:EnvironmentalandsafetyissuesAMLCDAd
2、vantage:thin,light-weighted,andlowpowerconsumptionApplications:portable&compactsystemsandHDTVMarket:19932billions199810-15billionsDisadvantage:cost,largeupfrontinvestmentandmanufacturingdifficultiesTFT-basedActiveMatrixLCDs(AMLCD)DATADRIVERSSCANDRIVERSInan
3、AMLCDdisplay,eachpixelhasaTFT.Thegateisattachedtoahorizontalrowelectrodeandthedrainisattachedtoaverticalcolumnelectrode.ThesourceisattachedtotheLCelectrode.Thedisplayisactivatedonerowatatime,byactivatingthegatelines.Thecolumnelectrodescarrythedatavoltages.
4、WhenaTFTisturnedon,thedatalinechargesuptheLCcapacitortotheappropriatevoltage.ThentheTFTisturnedoff,sothatthechargeisheldonthecapacitoruntilthenextrefreshtime.(Typicalrefreshratesare60-70Hz)ThedatavoltageisisolatedfromtheotherrowsofthedisplaybytheTFT,sothat
5、crosstalkisverylow,evenwhenthenumberofrowsislarge.Theoveralleffectisalmostthesameasbeingabletocontrolthevoltageateachpixels.Thus,anypointonthetransmissioncurveisaccessible,leadingtogoodON/OFFcontrastandgoodgrayscalecontrol.TFT-basedActiveMatrixLCDs(AMLCD)L
6、iquidCrystalOperationLCsandwichedbetweenglassplates,whicharerubbedatrightanglestoaligntheLCmolecules.Polarizersalignedperpendicularlyoneitherside.Withnovoltageappliedacrossthepixel,theLCmoleculestwisttoaligntotherubbingoftheglassplates.Lightenteringthefirs
7、tpolarizeristwistedandcanexitthesecondpolarizer-->pixelisONWithavoltageappliedacrossthepixel,theLCmoleculesuntwisttoalignwiththeelectricfield.Lightenteringthefirstpolarizercannotexitthesecondpolarizer-->pixelisOFF.LiquidCrystalPixel:ONPolarizer1(Vertical)P
8、olarizar2(Horizontal)HorizontallyPolarizedLightOutUnpolarizedLightInLiquidCrystalNoappliedvoltage:opticalpolarizationfollowstwistofLCmoleculesLiquidCrystalPixel:OFFPolarizer1(Vertical)Polarizar2(Horizontal)No
