TFTLCD基本原理課件

TFT-LCD基本原理與設(shè)計(jì)

課程大綱TFT-LCD簡介液晶的光電特性TFTLCDsA/C架構(gòu)

TFTLCDs模組架構(gòu)TFT-LCD驅(qū)動(dòng)原理DrivingmethodDrivingwaveform電容效應(yīng)TFT-LCD設(shè)計(jì)主動(dòng)矩陣式液晶顯示器

AM-LCDsMonitorSystemLCDTimingControllerLCDPanelDataDriverScanDriverRGBDigitalDataGMA1~GMA181818PowerSupplyCircuitBacklightPowerSupplyBacklightR[5:0]G[5:0]B[5:0]HsVsCLKDE+5VGNDData&ScanDriverPowerSupplyDataDriversControlSignalsPCInterfacePCRGBHsVsTFT-LCDModulePCGMA1~GMA184A/DInterfaceorDigitalInterfaceScanControlSignals主動(dòng)矩陣式液晶顯示器

AM-LCDsPanelStructure主動(dòng)矩陣式液晶顯示器

AM-LCDsPanelStructure主動(dòng)矩陣式液晶顯示器

AM-LCDsPanelStructureClcTFTSubstrateColorFilterSubstrateRGBClcClcRBG主動(dòng)矩陣式液晶顯示器

AM-LCDsPanelStructureTNModeLCDsFieldON入射光偏光板液晶分子玻璃基板出射光之極化狀態(tài)解偏板出射光未加電場(chǎng)OFF狀態(tài)TN&STN電光轉(zhuǎn)移曲線V-TCurve100%90%10%VnsSTNVsSTNVsTNVnsTNVIn-Plane-SwitchModeLCDs偏光板解偏板液晶分子作用電極玻璃基板入射光作用電場(chǎng)方向出射光之極化狀態(tài)未加電場(chǎng)“OFF”狀態(tài)施加電場(chǎng)“ON”狀態(tài)出射光ComparisonofLCModesStronglydependentonviewingangle低驅(qū)動(dòng)電壓視角窄小Off(White)On(Black)Slightlydependentonviewingangle廣視角液晶反應(yīng)速度慢Off(Black)On(White)畫面對(duì)比低畫面品質(zhì)差Slightlydependentonviewingangle畫面對(duì)比高廣視角Off(Black)On(White)液晶反應(yīng)速度快彩色畫面顯像佳TNIPSVA主動(dòng)矩陣式液晶顯示器

AM-LCDsPanelStructureTFT-LCDModuleTTLLVDSPanelLinkSingalControllerDC/DCDirverICinvertorTFT-LCDBLX-PCDYPCBGammaGen.ComponentEMITFTLCDs等效電路RowDriversColumnDriver1H1HClcCsCsCsCsCsCsCsCsCsClcClcClcClcClcClcClcClcTimingChartofTFTLCDsFrameTimeGate123N1HL1L2L3DATATFTLCDsDrivingMethodColumnInversionDotInversionRowInversionFrameInversionACModulationAddressingofTFTLCDsV0V1V2V62V63V63V62V2V1V0CommonWaveformGraylevelVoltage1Frame/1LineTFTLCDs的電光效應(yīng)

DirectAddressingTFTLCDs的電光效應(yīng)

ACAddressingCsonCommon與CsonGate液晶畫素TFTGateLineDataLineCsCs液晶畫素TFTCommonCommonGateLineDataLineCsCsCsonCommonCsonGateTFTLCDsDrivingWaveform

CsonCommon(一)TFTLCD驅(qū)動(dòng)波形(CsonCommon,Common=DCBias)二階驅(qū)動(dòng)方式的效應(yīng)CsClcCgdCsdCgsVctCh(N-1)Ch(N)Vs垂直影像訊號(hào)水平掃描訊號(hào)Vg水平掃描訊號(hào)VgVshVslVstVthVth正極性驅(qū)動(dòng)負(fù)極性驅(qū)動(dòng)負(fù)極性驅(qū)動(dòng)正極性驅(qū)動(dòng)資料驅(qū)動(dòng)晶片輸出訊號(hào)電位液晶畫素電位Vct=Vst-ΔVpΔVpBlack(+)White(+)White(+)Black(+)Black(-)Black(-)White(-)White(-)TFT補(bǔ)償驅(qū)動(dòng)法Ch(N-1)Ch(N)Vst=Vct影像訊號(hào)波形Vs水平脈波掃描波形VgeVgeVghl3LevelAddressingTFT-LCDModule設(shè)計(jì)(一)訂定TFT-LCDModuleSpec--Resolution/Power/Dimension.VideoSignalFormat/ScanLinePeriod(Hs)/FramePeriod(Vs)TFT的ION/IOFF電流ION必須于一條水平掃描線時(shí)間將影像電壓充入液晶電容(Clc)IOFF必須使充入液晶電容中的影像電容維持一個(gè)Frame的時(shí)間直流漂移(DCOffset)當(dāng)ScanLine上GatePule關(guān)閉時(shí),透過離散電容(Cgd,Cgs,Cds),對(duì)畫素電極(PixelElectrode)所造成的Feedthrough效應(yīng).TFT-LCDModule設(shè)計(jì)(二)水平掃描脈線的RC時(shí)間常數(shù)高解析度時(shí),必須降低RC時(shí)間常數(shù),以利液晶電容之充放電.液晶的電光轉(zhuǎn)移特性曲線(V-TCurve)必須量測(cè)LCDPanel正確之V-TCurve,以利GammaCorrection選擇適合的驅(qū)動(dòng)方式(CsonGateorCOM)考慮F