SAMSUNG-AMOLED介绍

-1-IntroductionDisplayCategoryOLEDvs.LCDAMOLEDvs.PMOLEDTopEmissionvs.BottomEmissionAMOLEDDeviceOperationofAMOLEDStructureofAMOLED-2-CRT(CathodeRaytube)LCD(LiquidCrystalDisplay)PDP(PlasmaDisplayPanel)VFD(VacuumFluorescentDisplay)FED(FieldEmissionDisplay)DLP(DigitalLightProcessing)DISPLAYSelf-emissiveLight-inducingorreflectingOLED(OrganicLightEmittingDiode)DisplaycategorybylightsourceLCoS(LiquidCrystalonSilicon)DisplayCategory(1)-3-DisplaycategorybydrivingmethodLCoS(LiquidCrystalOnSilicon)PMOLED(OrganicLightEmittingDiodes)DLP(DigitalLightProcessing)AMOLED(OrganicLightEmittingDiodes)CRT(CathodeRayTube)VFD(VacuumFluorescentDisplay)FED(FieldEmissionDisplay)PDP(PlasmaDisplayPanel)AMLCD(LiquidCrystalDisplay)a-SiTFT(a-SiThinFilmTransistor)TFD(ThinFilmDiode)P-SiTFT(p-SiThinFilmTransistor)TN(TwistedNematic)STN(SuperTwistedNematic)FLC(FerroLiquidCrystal)ActiveMatrixPMLCD(LiquidCrystalDisplay)DISPLAYPassiveMatrixDisplayCategory(2)-4-LiquidCrystalBacklightUnitColorFilterGlassPolarizerGlassGlassGlassPolarizerLCDOLEDPolarizerLightsourceBLUwithwhitelightOrganiclayersemitR,G,BcolorsColorsourceC/FmakesR,G,BcolorsfromBLU’swhitelightGraysLiquidcrystalcontrolsamountoflightAmountofcurrentcontrolsluminescenceACVoltageDCCurrentOLEDvs.LCD-5-SubstrateITOpatterningonlyCircuitonGlasswithLTPSprocessEvaporationEvaporationprocessisfundamentallythesamePMOLEDusessmallersubstrateanditsprocesseshavelowerpixeldensitythanAMOLEDCostSmallinvestmentandsimpleprocessLowmanufacturingcostIntensiveinvestmentandcomplicatedprocessHighmanufacturingcostAnodeCathodeGlassGlassAnode(ITO)CathodeGlassorMetalGlassTopEmission(A)BottomEmission(B)PMOLEDAMOLED※AorBispossible.AismoreadvancedtechnologyAMOLEDvs.PMOLED(1)-6-PMOLEDAMOLEDDrivingDrivenbyDuty-Sequentiallightemissiononselectedlineonlywhilenon-selectedlinesare“off”Luminescenceofaline(PeakLuminescence)=luminescenceofdisplayX#ofLinesDrivenbyStatic-Sequentiallight(information)refreshonselectedlineonlywhilemaintainingluminescenceofnon-selectedlinesLuminescenceofalineisthesameasluminescenceofdisplayPowerHighpowerconsumptionduetoitspeakluminescencethatrequireshighdrivingpowerLowpowerconsumptionthroughlowvoltagedrivingResolution/SizeMaximumnumberoflinespossibleisabout220,meaningmaximumresolutionofQCIF+DifficulttoincreasedisplaysizeduetohighpowerconsumptionandresolutionlimitResolutionisnotthetechnicallimitationfactor,butmaximumpixeldensityismorethan200ppi.Easytoincreasedisplaysize,butLTPSprocesslimitsthesizeAMOLEDvs.PMOLED(2)-7-DATADRIVERSCANDRIVERPMOLEDDriving-8-DATADRIVERSCANDRIVERVddAMOLEDDriving-9-Itrequiresmoreadvancedprocesstechnologyandknow-howtoproducetopemissionAMOLEDthanbottomemissionAMOLED.BottomemissionTopemissionPros•Easytodevelop•Simpleprocess•SuperiorImage(Highapertureratio)•Enhanceddisplayperformance(Lifetime,Powerconsumption)Cons•Lowapertureratio•RequiresmoreadvancedpaneltechnologyEmissionareaCircuitareaDatalineAnodeCathodeGlassGlassScanlineAnodeCathodeGlassGlasstEmissionareaScanlineBottomemissionTopemissionTopEmissionvs.BottomEmission-10-SMD’sAMOLEDTechnologyisbasedon•ColorPatterning:R,G,Bindividuallyevaporated•Emissiontype:Topemission•Backplane:LTPSEmissionareaCircuitareaScanlineDatalineGlassAnodeCathode※ConceptualImageSMD’sAMOLEDTechnology-11-ExcitonsBasicOperationMechanismOLEDdeviceconsistsofseveralfunctionalsub-layers.HolesfromAnodeandElectronsfromCathodemeetatEMLandformExcitonswhichradiatelight.ThecolorisdeterminedbytheEMLlayer.GlassAnodeHILHTLEMLHBLETLEILCathode-+-+AMOLEDDevice(1)-12-CharacteristicsofOLED•TheElectricModelofOLEDconsistsofDiode+CapacitorElectricalcharacteristicofOLEDissimilartodiodeinforwardbiasconditionTheluminanceintensitiesareproportionaltothecurrentIntensitiesSwitchingTRDrivingTRlightOLEDmaterialELCapacitorAnodeCathodeAMOLEDDevice(2)-13-0102030405060-5000500100015002000250030003500Luminance[cd/m2]CurrentDensity[mA/cm2]Currentdensityvs.LuminanceREDGREENBLUE(1)L-IcurvesLightIntensityControl(1)Theluminanceintensitiesareproportionaltothecurrentintensities(2)Thecurrentintensitiescanbecontrolledbyvoltagelevels(3)therefore,wecancontroltheluminanceintensitiesbyvoltagesettings(Voltageprogrammeddriving)234560102030405060CurrentDensity[mA/cm2]VEL[V]PixelcurrentdensityREDGREENBLUEDiodelike..(2)I-Vcurves1.52.02.53.03.54.04.55.05.56.0-5000500100015002000250030003500Luminance[cd/m2]VEL[V]LuminanceREDGREENBLUE(3)L-VcurvesAMOLEDDevice(3)-14-Basicstructure:2TR+1cap.,Id=(k/2)×(Vgs-Vth)2DrivingTRshouldbedriveninsaturationmodeforstablecurrentandluminescenceofthedeviceForlowpowerconsumption,Vtr_max&Vel_maxshouldbeminimizedSwitchingTRDrivingTRDataLine(Vdata)ScanLineCstVanodeELVcathodeVtrVelVdsIdsVtrVelOperationofAMOLED-15-AnalogLogic3:1DemuxEmissiondriverDC-DCconverter3.8V(VBattery)ELVDDELVSSVCIVCCScanDeriverOLEDmaterialELCapacitorCathode(2)Scan/Emissiondriver(1)AMOLEDpixelarray(3)DriverIC(4)DC-DCConverterAnodeVCCIODisplayDataSPI(5)FPCBStructureofAMOLED-16-FeaturesofAMOLEDWideColorGamutHighContrastImageQualityFastResponseTimeThinFormFactor-17-VividColorHighContrastBetterSu