TFT LCD驱动原理

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TFTTFT--LCDLCDPartIPartI ©ChiMeiOptoelectronicsPage2PDD1/PD2(1/2)(1/2)    TFT-LCDV-Tcurve ( )pixeladdressing,refreshrate,frametime,linetimeDC,imagesticking,imageretentionflicker(specialtestpattern)polarityinversion©ChiMeiOptoelectronicsPage3PDD1/PD2(2/2)(2/2)TFT-LCDTCONDatadriverScandriverDC/DCGAMMA©ChiMeiOptoelectronicsPage4PDD1/PD2                !!!!####$$$$%%%%&&&&'()'()'()'()*+,*+,*+,*+,----./012./012./012./0123333/4567/4567/4567/4567566566566566898898898898::::;=;=;=;=?@A?@A?@A?@A/4567/4567/4567/4567B7566B7566B7566B7566 CDECDECDECDE::::pixeldot(sub-pixel)©ChiMeiOptoelectronicsPage5PDD1/PD2F#GHF#GHF#GHF#GHF%GIF%GIF%GIF%GIQ:F#F%GF#F%GF#F%GF#F%G?Q:JFJ#FJ%GJFJ#FJ%GJFJ#FJ%GJFJ#FJ%G?!#:$%&        (1/2)(1/2)©ChiMeiOptoelectronicsPage6PDD1/PD2TFTPolarizerCFPolarizerPCBLightGuide: LCcell ColorFilter        (2/2)(2/2)Q:LCDKLMNKLMNKLMNKLMNO(O(O(O(?Q:LCDKLPQ(RSKLPQ(RSKLPQ(RSKLPQ(RS?©ChiMeiOptoelectronicsPage7PDD1/PD2RedGreenBlueWhiteGrayScale08162432404856636bit,    26x26x26=262,1448bit,    28x28x28=16,777,216ColorDepthColorDepth(1/2)(1/2)TUO(RSTUO(RSTUO(RSTUO(RSVWXNYVWXNYVWXNYVWXNY©ChiMeiOptoelectronicsPage8PDD1/PD2 ColorDepthColorDepth(2/2)(2/2)©ChiMeiOptoelectronicsPage9PDD1/PD2    LCDLCD90TN©ChiMeiOptoelectronicsPage10PDD1/PD2  904VTN4V0V2.3V1.7V2.1V1.9VZ[\T]^_`aPQ(bcdefZ[\T]^_`aPQ(bcdefZ[\T]^_`aPQ(bcdefZ[\T]^_`aPQ(bcdef©ChiMeiOptoelectronicsPage11PDD1/PD2       (%)ghiabc(hdghiabc(hdghiabc(hdghiabc(hdghjabc(hkghjabc(hkghjabc(hkghjabc(hk904VTNV-Tcurve!(V)VV--TCurveTCurve(1/2)(1/2)lmlmlmlmn]^ogjiXZPQbc(deapqPn]^ogjiXZPQbc(deapqPn]^ogjiXZPQbc(deapqPn]^ogjiXZPQbc(deapqPQ#%(rstuQ#%(rstuQ#%(rstuQ#%(rstu©ChiMeiOptoelectronicsPage12PDD1/PD2VV--TCurveTCurve(2/2)(2/2)©ChiMeiOptoelectronicsPage13PDD1/PD2pixeldot(sub-pixel)LCDLCD            nnnnvwxyvwxyvwxyvwxyz{z{z{z{vwgvwgvwgvwg©ChiMeiOptoelectronicsPage14PDD1/PD2TFTLCDPixelEquivalentCircuitGSDDatalineScanlineVstVcomClcCstCgdVgVsVdVlc+-Vlc|}~€ ‚|}~€ ‚|}~€ ‚|}~€ ‚    !#$%&'()*+,,©ChiMeiOptoelectronicsPage15PDD1/PD2TFTSwitchTFTSwitch©ChiMeiOptoelectronicsPage16PDD1/PD2ONOFFOFFOFF(1/2)(1/2)ƒ„…† ‡ˆ‰Š‹ŒaŽgfƒ„…† ‡ˆ‰Š‹ŒaŽgfƒ„…† ‡ˆ‰Š‹ŒaŽgfƒ„…† ‡ˆ‰Š‹ŒaŽgf‘† ‡’“}”•gf‘† ‡’“}”•gf‘† ‡’“}”•gf‘† ‡’“}”•gf©ChiMeiOptoelectronicsPage17PDD1/PD2ONOFFOFFOFF16.7ms20us16.7ms16.7ms(2/2)(2/2)–—‹Œ† ‡ag˜l™}a”Zš˜™}f–—‹Œ† ‡ag˜l™}a”Zš˜™}f–—‹Œ† ‡ag˜l™}a”Zš˜™}f–—‹Œ† ‡ag˜l™}a”Zš˜™}f„…†›‡a‰ŠœŽ‹Œf‘†›‡’ž“gf„…†›‡a‰ŠœŽ‹Œf‘†›‡’ž“gf„…†›‡a‰ŠœŽ‹Œf‘†›‡’ž“gf„…†›‡a‰ŠœŽ‹Œf‘†›‡’ž“gfŸ ¡¢aX£¤ ¥¦fŸ ¡¢aX£¤ ¥¦fŸ ¡¢aX£¤ ¥¦fŸ ¡¢aX£¤ ¥¦f©ChiMeiOptoelectronicsPage18PDD1/PD2AddressingAddressingGateChargePixelElectrodeStorageCapacitor©ChiMeiOptoelectronicsPage19PDD1/PD2ScanDriverOutputScanDriverOutput----:§¨u§¨u§¨u§¨u1280x800;60HzrefreshrateFrameTime=(1/60)s=16.7msLineTime=16.7ms/(800+23)=20.1us©ChiMeiOptoelectronicsPage20PDD1/PD2Vcom(CF)--++++++----Vpixel(TFT)0V4V+4VVcom(CF)++++----Vpixel(TFT)0V3V+3V-.!]^©ªZ«¬­®¯°]^©ªZ«¬­®¯°]^©ªZ«¬­®¯°]^©ªZ«¬­®¯°±²³Ž´ µ¶±²³Ž´ µ¶±²³Ž´ µ¶±²³Ž´ µ¶,]^·¸X¹º€»¼]^·¸X¹º€»¼]^·¸X¹º€»¼]^·¸X¹º€»¼….©ChiMeiOptoelectronicsPage21PDD1/PD2Switchtofullgrayscale128after12hoursatroomtemp.IdealcaseSurfacetypeLineshape!#$%#&!#$%#&!#$%#&!#$%#&'('('('(ImageStickingImageSticking©ChiMeiOptoelectronicsPage22PDD1/PD2switchtofullwhiteswitchtofullwhiteImageRetentionImageRetentionTwotypesoftheimageretentioncases.Theremightbeothertypeimageretentioncases.©ChiMeiOptoelectronicsPage23PDD1/PD2+~ACdrivingRDC++---+-Externalelectricfield+++---+-InternalelectricfieldITOPIITOPIDCDCTheResidualDCdrivestheionsoftheLC.TheionsattachonthePIanddonotreleasewhenthevoltageisoff.Thepreviousima

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