TFT LCD驱动原理

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1、TTFFTT--LLCCDD

PPaarrttII
(1/2)

TFT-LCD


V-Tcurve
()
pixel

addressing,refreshrate,frametime,linetime

DC,imagesticking,imageretention
flicker(specialtestpattern)
polarityinversionPDD1/PD2©ChiMeiOptoelectronicsPage2(2/2)
TFT-LCD


2、

TCON
Datadriver
Scandriver
DC/DC
GAMMAPDD1/PD2©ChiMeiOptoelectronicsPage3


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3、ChiMeiOptoelectronicsPage5(2/2)
Q:LCDKLMNO(?ColorFilter
Q:LCDKLPQ(RS?Polarizer
LCcellCFPolarizer
TFTPCBLightGuide:PDD1/PD2©ChiMeiOptoelectronicsPage6CCoolloorrDDeepptthh(1/2)
TUO(RSVWXNYGrayScale0816243240485663RedGreenBlueWhite
6bit,26x26x26=262,144
8bit,2

4、8x28x28=16,777,216PDD1/PD2©ChiMeiOptoelectronicsPage7CCoolloorrDDeepptthh(2/2)
PDD1/PD2©ChiMeiOptoelectronicsPage8LLCCDD
90TN





PDD1/PD2©ChiMeiOptoelectronicsPage9


904VTN
Z
[T]^_`aPQ(bcdef










5、4V2.3V2.1V1.9V1.7V0VPDD1/PD2©ChiMeiOptoelectronicsPage10VV--TTCCuurrvvee(1/2)
904VTN

ghiabc(hd
(
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)



V-Tcurve!









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gjiXZPQbc(deapqPQ#%(rstuPDD1/PD2©ChiMeiOptoelectronicsPage11VV-

6、-TTCCuurrvvee(2/2)PDD1/PD2©ChiMeiOptoelectronicsPage12LLCCDD


nvwxyz{vw
gpixeldot(sub-pixel)PDD1/PD2©ChiMeiOptoelectronicsPage13TFTLCDPixelEquivalentCircuit

Vlc

7、}~•€•‚
!"
Dataline
#$%&'()*+,,ScanlineVgGCgdVsVd+SDCstClcVlc-VstVcomPDD1/PD2©ChiMeiOptoelec

8、tronicsPage14TTFFTTSSwwiittcchhPDD1/PD2©ChiMeiOptoelectronicsPage15(1/2)ONOFFOFFOFF
ƒ„…†‡ˆ‰Š‹Œa•Ž•
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gfPDD1/PD2©ChiMeiOptoelectronicsPage16(2/2)OFF16.7msON20usOFF16.7msOFF16.7ms