TFT-LCD驅動原理群創光電新幹班EE專業教育訓練資料OperatingPrincipleOfLCDPanelStructureDotPixelCstonGate&CstonComCstonGate&CstonComLCOperatingLCneedsACdriving!!+3V-5V+4V-2V+1V-3V+4V-5V+4V-3V+5V-4V+2V-1V+3V-4V+5V-4V→TFTOperatingVcoupling(Feed-through)PixelCgdCgsCsdCsdbCsdbTFTDrivingWaveformCsClcCgdCsdCgsVctCh(N-1)Ch(N)Vs垂直影像訊號水平掃描訊號Vg水平掃描訊號VgFrameTimeFrameTimeGate123N1HL1L2L3DATAFramerateDuty(週期):Time/次Frequency(頻率）:次/Time(F=1/T)Hz:次/SecFrameRate:Pictures/sec(60Hz,75Hz)ActualLCDFrameRate:FrameRate/2LCDDrivingBlockCsClcCgdCsdCgsVctCh(N-1)Ch(N)VsSourceLineGateLineVgVgVshVslVstVthVth正極性驅動負極性驅動負極性驅動正極性驅動資料驅動晶片輸出訊號電位液晶畫素電位Vct=Vst-ΔVpΔVpBlack(+)White(+)White(+)Black(+)Black(-)Black(-)White(-)White(-)2LevelDrivingGateDriver(2-levelNT3951C)1.U/D='H'MODE='H'(256+2CHoutput)CPVDI/OX1X2X4DO/I257123256OE4X5255567X3VGGX263X0,X264:DeletedfromnormaloutputbyOEVDDGNDVDDVEEVEEVDDVDDGNDGNDGNDXonGNDVDDGateDriver(2-levelNT3951C)XGAVESATimingSXGAVESATimingB(+)W(-)B(-)W(+)正極性負極性Vst=VctB(+)B(-)W(+)W(-)B(+)W(-)B(-)W(+)ΔVp=CgdVghl/Ct正極性負極性正極性Ct=Cs+Clc+Cgd負極性CsVge/CtCsVge/CtCsClcCgdCsdCgsVctCh(N-1)Ch(N)VsSourceLineGateLineVgVg3LevelDrivingTpdhTstTpsuPOLOddoutputsEvenoutputsNegativePositiveLDTldTwldTstVcomOutputOutputloadcondition:DIO1/2(Input)CLKLastTldsLD1K15P1K15P1K15P1K15P1K15PHigh-ZHigh-ZHigh-ZSourceDriver(NT3969A)7.6V4.31V3.29V0VTRASMISSIONVOLTAGEVcom3.8VV0V1V4V5V8V9VreferencecircuitT-VCurveDCBiasofCommonGrayscaleVoltageV0V1V2V62V63V63V62V2V1V01Frame/1LineDirectDrivingofTFT-LCDV0V1V2V62V63V63V62V2V1V0CommonWaveformGrayScaleVoltage1Frame/1LineCommonSwingDrivingofTFT-LCD-4VVpixelVCOM-4V+4V+4V△=8VVCOMVpixel+4V+5V0V+1V+4V-4V△V=3VVDataVGateVCOMCSTCLCCSTCLCC