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1、JapaneseJournalofAppliedPhysicsVol.43,No.4A,2004,pp.1416–1420#2004TheJapanSocietyofAppliedPhysicsANovelDrivingMethodforFastSwitchingofaCellforDisplayofMovingPicturesSeoHernLEE1,Jin-WooKANG1,Gi-DongLEE1,Tae-HoonYOON1;2andJaeChangKIM1;21DepartmentofElectronicsEngineering,PusanNationalUniversity,
2、Pusan609-735,Korea2ResearchInstituteofComputer,InformationandCommunication,PusanNationalUniversity,Pusan609-735,Korea(ReceivedJune24,2003;acceptedDecember12,2003;publishedApril9,2004)Weproposeanoveldrivingmethodwhichisveryefficientforthedisplayofmovingpicturesonacell.Intheproposeddrivingmethod,ea
3、chscanpulseisdividedintotwopartsforfastswitchingunliketheconventionalactivematrixdrivingmethodthatusesonescanpulseforeachframe.Byoverdrivingorunderdrivingthecellusinganappropriatedatavoltageduringthefirstscantimeandapplyingadesireddatavoltagetothecellduringthesecondscantime,wecanachievefastswitc
4、hingbetweenallgraylevelswithinthetimebetweenthefirstandsecondscanpulse.[DOI:10.1143/JJAP.43.1416]KEYWORDS:fastswitching,doublescanmethod,cell,overdrive,underdrive,graylevel,liquidcrystal1.IntroductionScanline(VS)Recently,therehasbeenanincreasingdemandforTSDdisplayingmovingpicturesusingthin-film-t
5、ransistorliquidDataline(VD)crystaldisplays(TFT-LCDs).FastresponseisthemostimportantprerequisiteforthedisplayofmovingpicturesTsTsusingtheTFT-LCDs.Theresponsetimesofconventionaltwistednematic(TN)andsupertwistednematic(STN)liquid-crystalmaterialsusedinmostdirect-viewLCDsaretooslowtosupportthem.Toob
6、tainfastresponsetime,variousattemptssuchasthemethodusinglowcell-gapTNLCDwithhighopticalanisotropyandlowviscosity,1)ferroelectricliquidcrystaldevices(FLCDs)withsponta-neouspolarization,2)andthenewdrivingschemebasedonoverdriveaddressing3–7)havebeenproposed.However,the+VD-VDmethodusinglowcell-gapTN
7、givespooryieldduringthe1framepracticalmanufacturingprocess.ThemethodusingFLCDshassomedifficultiesinachievingreliableandgoodqualityFig.1.Scanpulseoftheproposeddrivingmethod.Tsisdeterminedbythealignmentwithoutdefects.8)Itisdifficu
