《tft lcd驱动原理》由会员分享，可在线阅读，更多相关《tft lcd驱动原理（50页珍藏版）》请在金锄头文库上搜索。
1、TFTTFT- -LCDLCD?Part IPart I? ? Chi Mei OptoelectronicsPage2PDD1/PD2?(1/2)(1/2)?TFT-LCD?V-T curve ?(?)?pixel?addressing, refresh rate, frame time, line time ?DC?, image sticking, image retention?flicker (special test pattern)?polarity inversion Chi Mei OptoelectronicsPage3PDD1/PD2?(2/2)(2/2)?TFT-LCD
2、?TCON?Data driver?Scan driver?DC/DC?GAMMA Chi Mei OptoelectronicsPage4PDD1/PD2? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?! ? “! ? “! ? “! ? “ #? ? ? ?$ ? “$ ? “$ ? “$ ? “ %? ? ? ? ?A?A?A?A/ 4 5 6 7/ 4 5 6 7/ 4 5 6 7/ 4 5 6 7 B 7 5 6 6B 7 5 6 6B 7 5 6 6B 7 5 6 6 ?C D EC D EC D EC
3、D E : : : :? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?pixeldot (sub-pixel) Chi Mei OptoelectronicsPage5PDD1/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?!“#:$%60Hz refresh rate Frame Time = (1/60) s =16.7ms Line Time = 16.7ms/(800+23) = 20.1us Chi Mei Optoelect
4、ronicsPage20PDD1/PD2?Vcom (CF?)- -+- - - -Vpixel (TFT?)0V4V+4VVcom (CF?)+- - - -Vpixel (TFT?)0V3V+3V?-.!?“Zfifl?“Zfifl?“Zfifl?“Zfifl?,X”?X”?X”?X”?. Chi Mei OptoelectronicsPage21PDD1/PD2Switch to full grayscale 128 after 12 hours at room temp.Ideal caseSurface typeLine shape? ? ? ? ? ! “ # $ % # & ?
5、? ? ? ? ! “ # $ % # & ? ? ? ? ? ! “ # $ % # & ? ? ? ? ? ! “ # $ % # & ? (Image StickingImage Sticking Chi Mei OptoelectronicsPage22PDD1/PD2switch to full whiteswitch to full whiteImage RetentionImage Retention?Two types of the image retention cases. There might be other type image retention cases. C
6、hi Mei OptoelectronicsPage23PDD1/PD2+AC drivingRDC+-+-External electric field+-+-Internal electric fieldITOPIITOPIDC DC ?The Residual DC drives the ions of the LC. ?The ions attach on the PI and do not release when the voltage is off .?The previous image appears due to the internal electric field es
7、tablished by the ions. Chi Mei OptoelectronicsPage24PDD1/PD2DC DC VcomVcomVcom (CF?)- - - -+- - - -Vpixel (TFT?)Vcom+- - - -+- - - -Vpixelv?fl?v?fl?v?fl?v?fl?Vpixel Vcom?fl?fl?fl?fl?Vpixel Vcom?fl?fl?fl?fl?Vpixel Vcom? Chi Mei OptoelectronicsPage26PDD1/PD2Inversion DrivingInversion Driving?Frame inv
8、ersionodd frameeven frame+- Chi Mei OptoelectronicsPage27PDD1/PD2time16.67msVcomApplied voltage shiftsFlickerFlicker?v?g?v?g?v?g?v?g? ? ?Flicker (?)?VcomVcomAa?Aa?Aa?Aa?Aa?Aa?Aa?Aa?panelpanel?VcomVcom?!? ? ? ? ? ? ? ? ? ? ! ? Chi Mei OptoelectronicsPage28PDD1/PD2+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
9、-+-+-+-+-+-+-+-+-+-+-+-+-+-Frame InversionRow InversionColumn InversionDot InversionInversion MethodsInversion Methods Chi Mei OptoelectronicsPage29PDD1/PD2Inversion ComparisonInversion Comparison Chi Mei OptoelectronicsPage30PDD1/PD2Scan/Data DrivingScan/Data DrivingVoltageTimeTimeVoltageScan line
10、Data lineVcomColumn InversionDot InversionScan line Data lineVcom Chi Mei OptoelectronicsPage31PDD1/PD2-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-SubSub- -pixel Checkerpixel Checker?Sub-pixel checker
11、pattern with dot inversion ? flicker?pattern?flicker(?) ?-K-K-K-KWindows? Chi Mei OptoelectronicsPage32PDD1/PD2+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-2 2- -line Inversionline Inversion?1/2 driving power consumption ?Minimum flicker?Avoid flicker when Windows shutdown pattern Chi Mei OptoelectronicsPage33PDD1
12、/PD2-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-SubSub- -pixel Checkerpixel Checker?2-line inversionXZ|XZ|XZ|XZ|Windows?flicker?X?A)?X?A)?X?A)?X?A)?!?X?X?X?X?pattern?2-line inversion MNMNMNMNflicker! Chi Mei OptoelectronicsPage34PDD1/PD2CrossCross- -TalkTalkVertical cross-talkHorizontal cross-talkSome speci
