TFT-LCD驅(qū)動原理PD課件

TFT-LCD驅(qū)動原理群創(chuàng)光電新幹班EE專業(yè)教育訓(xùn)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(qū)動負極性驅(qū)動負極性驅(qū)動正極性驅(qū)動資料驅(qū)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