液晶TFTLCD Gamma Tuning校正原理与步骤Mobile Driver IC Gamma Tuning FAE: Brad Chen 2006/02/15 1 Gamma Tuning 1. VCOM Setting & Feed through Compensation 2. Gamma Resistor String 3. Gamma Measurement 4. Gamma Tuning 5. Summary 2 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 3 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 4 D. VCOMH3.6V~4.1V, (VCM4-0=10100~11011) VCOMH Step=0.02*Vgam1out,80~90mV. R/……