CHAPTER 6 Output4.ppt

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1、CHAPTER6outputFlat-panelDisplaysCRTCRTliveson:50s–VSEL;60s–VSPlasmapanels;now–VSLCD.Advantage:Availableinavarietyofsizeswithawideselectionofphosphors;Fastresponsetime;Lowcost,etc.Disadvantage:Depthneededtofocusorscanthebeam;Highpowerconsumption.CRTDisplays–BasicOperationsLeft:Basicstructure

2、ofCathode-raytube.Right:AddressingmethodofCRT–Raster.FlatPanelDisplaysFlatnessRatio:DepthtopicturediagonalDefinition:Flat;Light;Requirelesspower…Classification:Emissive:Gasdischarge;Plasmapanel;Light-emittingdiode;Vacuumfluorescence;Electroluminescence;Flatcathode-raytube;Non-emissive:Liqui

3、dcrystal;Electromechanical;Electrochromatic;Electroactivesolids;LiquidCrystalShape&Phases:LiquidCrystalDisplaysPrincipleofatwistednematic(TN)LCDSupertwistednematicLCcell:Largertwistedangle;SmallervoltagerequiredAddressingSchemesforLCDLeft:DirectAddressingRight:PassiveMatrixLCDwithrowandcolu

4、mnelectrodesTFTmatrixAddressedLCDMotivation:ToimprovetheresponsespeedCircuit&Schemes:FabricationofTFTsTFTsareMetal-Insulator-SemiconductorFieldEffectTransistors,whichareusedmoreoftenasbottom-gate.Forgate-dielectric:CdSe–aSi–PolySiA-Si:Lowmaskcount;Smallnumberofmaskalignmentsandprocessingste

5、psP-Si:Highermobility;butneedstodeveloplowtemperatureprocessing.Guest–Host(GH)DisplaysTN&STN:Lowtransmittance;Highpowerconsumption.GHDisplays:Fewerpolarizerandcolorfilters;Bright;Wideviewingangle.Host–LiquidCrystal;Guest–anisotropicdyesGuest-HostDisplaysLeft:BasicGHcell.Offstate:Polarizedwh

6、itelightisabsorbedbythedye.Remainingspectrumexitsasthecoloredlight.Onstate:Dyesaretunedbyelectricfieldandallowthelighttopassaswhitelight.Right:DoubleGHcell.Thepolarizerisreplacedbythesecondcell,inwhichtheLCmoleculeorientationisrotatedby90degreewithrespecttothefirstcell.Guest–HostDisplaysLef

7、t:ReflectiveGHD.Offstate:Dyeabsorptionyieldsadarkstate.Onstate:Smoothmetalelectrodereflectsalmost100percentoftheincominglight,whichisforwardscatteredbythefrontscatteringfilm.Right:Structureofastackedthree–layerGHD.Itgeneratescolorwithoutusingacolorfilter