液晶TFTLCD Gamma Tuning校正原理与步骤--...

奇景ICGamma TuningMobile Driver IC Gamma Tuning
FAE: Brad Chen 2006/02/15

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Gamma Tuning
1. VCOM Setting & Feed through Compensation 2. Gamma Resistor String 3. Gamma Measurement 4. Gamma Tuning 5. Summary

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1. VCOM Setting & Feed through Compensation
A. VCOMHπ(4V). B. VCOMLаFeed-through(Vgd). Feed-through , аCellDriver ICрVgd.

VCOMH

Driver IC Output Vgd Real Cell level

Real LC voltage

VCOML

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C. Vgam1outGamma. 4.3~4.8V (VRH= 0010~0101) Vci1(REGP) =Vci, 2.65~2.7V (Vci-0.15).
VRH3 VRH2 VRH1 VRH0 VGAM1OUT

0 0 0 0

0 0 1 1

1 1 0 0

0 1 0 1

REGP x 1.55 (2.7*1.55=4.19V) REGP x 1.65 (2.7*1.65=4.45V) REGP x 1.75 (2.7*1.75=4.72V) REGP x 1.80(2.7*1.8=4.88V)

VCOMH

Vgam1outGamma

D10

D0D63
Negative

D0D63
Positive

VCOML

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D. VCOMH3.6V~4.1V, (VCM4-0=10100~11011) VCOMH Step=0.02*Vgam1out,80~90mV.
R/