LCD驱动原理介绍2课件

crosstalkCrosstalkisthedifferentvisiblecontrastoftheOFFsegmentsCrosstalkappearswhentheelectro-opticalstateofindividualpixelsareaffectedbytheelectro-opticalstatesofotherpixels2/6/20231crosstalkCrosstalkeffectsarecorrelatedtothenonidealdisplaycomponents:thenonzerosheetresistanceoftheITO-electrodes

theoutputimpedanceoftherowandcolumndrivers

actingincombinationwiththepixelcapacitance

entailsadistortionoftheaddressingwaveform2/6/20232crosstalkmin.frequencyhorizontalcrosstalkVertical+horizontalcrosstalkmax.frequency2/6/20233Crosstalk

verticalcrosstalkVerticalcrosstalk(ghosting)isgeneratedbythenonidealfrequencyresponseoftheLCDandtheimagedependentfrequencycontentofthecolumnsignalatlowfrequenciesthenecessaryvoltagetoachievea50%transmission(V50)decreaseattributedtoioniceffectsintheLClayertheeffectivepixelvoltagebecomeshighbecausethewaveformischangedonlyslightlyandthewaveformdistortionissmall

thepixelisdarkcrosstalk2/6/20235Crosstalk

verticalcrosstalkVerticalcrosstalk(ghosting)isgeneratedbythenonidealfrequencyresponseoftheLCDandtheimagedependentfrequencycontentofthecolumnsignalathighfrequenciesthenecessaryV50increasesduetothelow-passfilteringofthepanel,causedbytheITOsheetresistanceandthecapacitanceof

thepixelandthefrequencedependencyoftheeffectivepixelvoltagebecomeslowbecausedistorsionoccursinthecolumnoutputwaveformduetothedriverand/orpanelimpedancethepixelisbright2/6/20236ReductionofCrosstalkhomogenizethefrequencycontentofthecolumnwaveformimproveddrivingschemes-IAP-MLApatterndependentcorrectionoftheoutputvoltageofthedriverreducespacechargedensityreduceRCproductofthewholepanel(cellgap)lowdV/dfoftheLCmixturesufficiente-ocurveandselectionofanoptimumVop2/6/20237What’sMsignal(noM)CheckerboardwaveformAllon/offwaveform2/6/20239What’sMsignal

(M=1)在驅動波形中每(M+1)次就變換一次極性CheckerboardwaveformAllon/offwaveform2/6/202310What’sMsignal(032)032無設定Msignal時COMwaveform032設定M=6al時COMwaveform2/6/202311What’sMsignal(032)032設定M=6時A點合成waveform032設定M=6時B點合成waveform2/6/202313What’sMsignalHowtocalculteMfrequency?當無設定Msigna