lcd 驱动ic原理简介

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1、LCD驅動IC原理簡介DavidTsaiOutlineIntroductionofLCDDrivingTheoryTN/STNLCDDriverAM-LCDGateDriverAM-LCDSourceDriverAM-LCDDriverDesignConsiderationLC&LCDTypeLiquidCrystalSemecticLCNematicLCCholestericLCDiskLCLiquidCrystalDisplayTwistNematic(TN)SuperTwistNematic(S

2、TN)Double-layerSTN(DSTN)FilmSTN(FSTN)InPlaneSwitch(IPS)VerticalAlignment(VA)Multi-domainVA(MVA)LCDDrivingTheory–TNtypeTN&STNV-TTransferCurveStaticDrivingMethodUsedinTNStaticDrivingExampleSTNLCDDrivingDiagramSTNLCDDrivingWaveformDiagramColumn1暗亮亮Limitati

3、ononSTNLCDResolution=>SelectionRatio=>N=>SRMultiplexAddressingMethodPulseAmplitude電位皆為正製程較容易MultiplexAddressingBlockFrameRateControl--TemporalDitheringFrameRateControl–SpatialDitheringFrameRateControl–PWM變快,難做CrosstalkofSTNLCD(1)--StripeShadowingsegment

4、common*Pixel=common-segment*commonsegmentCrosstalkofSTNLCD(2)--BlockShadowingScopeofSTNDriverAll-in-OneLCDDriverChipLowPowerConsumptionforMobilePhoneApplicationProgrammableVoltageforDifferentTypePanelandSystemApplication4.StableReferenceOutputforDiffere

5、ntTemperatureCoefficientsPowerManagementofSTNDriverTFTLCDOperationArchitecture產生timingVideoSignalTimingSpecificationVideoSignalTimingSpecificationTFTLCDPixelSchematic--CsonCommonClc:TFTLCDPixelSchematic--CsonGateGatePulseTransmissionDelayLCDGateDriverBl

6、ockDiagram--2-levelDI/OCLOCK256/263Outputenable2-LevelGateDriverTimingDiagramStartpulseWhenOE=HOUT=LWhenXAO=LOUT=HLCDGateDriverBlockDiagram--3-levelYV1YV2YV33-LevelGateDriverTimingDiagramGateCellCross-coupling--CsonCommonGateCellCross-coupling--CsonGate

7、TFTLCDDrivingMethodComparisonofPowerConsumptionDirectDrivingACModulationDrivingLCDSourceDriverBlockDiagram極性Gama電壓R10toR17/R20toR27G10toG17/G20toG27B10toB17/B20toB27SourceDriverTimingDiagramHorizontalCrosstalk(1)HorizontalCrosstalk(2)Frame/LineInversion

8、ChargingPath亮暗V大V中V小Column/DotInversionChargingPathVcancelVcancelVcancelComparisonofAddressingMethodSourceDriverStructure--DigitalSourceDriverConsiderationPerformanceRequirement:OutputAccuracy(6bits?8bits?ormore?)PowerConsumption