《LCD驱动原理介绍》PPT课件

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1、crosstalkCrosstalkisthedifferentvisiblecontrastoftheOFFsegmentsCrosstalkappearswhentheelectro-opticalstateofindividualpixelsareaffectedbytheelectro-opticalstatesofotherpixels7/15/20211crosstalkCrosstalkeffectsarecorrelatedtothenonidealdisplaycomponents:thenonzerosheetresistanceoftheITO-electrodesth

2、eoutputimpedanceoftherowandcolumndriversactingincombinationwiththepixelcapacitanceentailsadistortionoftheaddressingwaveform7/15/20212crosstalkmin.frequencyhorizontalcrosstalkVertical+horizontalcrosstalkmax.frequency7/15/20213crosstalkColumnallofforonColumncheckerboard7/15/20214Crosstalkverticalcro

3、sstalkVerticalcrosstalk(ghosting)isgeneratedbythenonidealfrequencyresponseoftheLCDandtheimagedependentfrequencycontentofthecolumnsignalatlowfrequenciesthenecessaryvoltagetoachievea50%transmission(V50)decreaseattributedtoioniceffectsintheLClayertheeffectivepixelvoltagebecomeshighbecausethewaveformisc

4、hangedonlyslightlyandthewaveformdistortionissmallthepixelisdarkcrosstalk7/15/20215CrosstalkverticalcrosstalkVerticalcrosstalk(ghosting)isgeneratedbythenonidealfrequencyresponseoftheLCDandtheimagedependentfrequencycontentofthecolumnsignalathighfrequenciesthenecessaryV50increasesduetothelow-passfilt

5、eringofthepanel,causedbytheITOsheetresistanceandthecapacitanceofthepixelandthefrequencedependencyoftheeffectivepixelvoltagebecomeslowbecausedistorsionoccursinthecolumnoutputwaveformduetothedriverand/orpanelimpedancethepixelisbright7/15/20216ReductionofCrosstalkhomogenizethefrequencycontentofthec

6、olumnwaveformimproveddrivingschemes-IAP-MLApatterndependentcorrectionoftheoutputvoltageofthedriverreducespacechargedensityreduceRCproductofthewholepanel(cellgap)lowdV/dfoftheLCmixturesufficiente-ocurveandselectionofanoptimumVop7/15/20217STN面板之dv/df特性7/15/20218What’sMsignal(noM)Checkerboardwave

7、formAllon/offwaveform7/15/20219What’sMsignal(M=1)在驅動波形中每(M+1)次就變換一次極性CheckerboardwaveformAllon/offwaveform7/15/202110What’sMsignal(032)032無設定Msignal時COMwaveform032設定M=6al時COMwaveform7/15/202111What’sM