TFT-LCD驱动原理简介.ppt

驅動原理簡介 系統設計 * G1 G2 G3 Gm Gm-2 Gm-1 S1 S2 S3 Sn-2 Sn-1 Sn Circuit Plate Why does LC inversion ? TFT CF Vs Vcom TFT CF Vs Vcom + _ + _ Vcom Vsh Vsl Vsh Vsl Vcom Frame Inversion ? Line Inversion ? Column Inversion ? Dot Inversion Driving Method Driving method comparison Only DC Vcom High None Good Good Vertical and Horizontal Best Dot Only DC Vcom Low None Very good Poor Vertical Good Horizontal Better Column AC Vcom DC Vcom lowest High Bad Good Vertical Poor Horizontal Good Row AC Vcom DC Vcom Low Low Good Poor Vertical And Horizontal Poor Frame Signal Driver power Vcom Power Total Power Crosstalk Flicker Inversion Frame N Columns Frame N+1 Columns 1 2 3 4 5 1 2 3 4 5 Lines + － + － + + － + － + + － + － + － + － + － － + － + － Column Inversion Dot Inversion Line Inversion Frame Inversion 1 2 3 4 5 1 2 3 4 5 Lines + － + － + + － + － + + － + － + － + － + － － + － + － Driving Method Dot Inversion + - - + - + + - Vg Vs Vcom Vp 1 2 3 4 B A A1 A3 A2 A4 B1 B3 B2 B4 Feed-through Voltage Cs Vgh Vgl Gate Vs Cgd Clc Vcom Vp 電荷守恒定理 LVDS Timing Controller Gamma Generator DC-DC Converter V COM Driver User Connector Source Driver TFT-LCD Panel Gate Driver G1 G2 G3 G1050 D1 D2 D3 D4200 Source Controller PCB Control Signal VCOM Gamma DVDD AVDD Von / Voff Video Signal FPC Connector EEPROM I2C SXGA+ Block Diagram 1)Source driver a. P01(SD- LH165415) Feature: 1)6 bit digital input(262,144 colors) R(0,0,0,0,0,0,)-(1,1,1,1,1,1) G(0,0,0,0,0,0,)-(1,1,1,1,1,1) B(0,0,0,0,0,0,)-(1,1,1,1,1,1) 2)Single port input 3)11 reference voltages 4)Mode select: 309/300 output 5)Shift clock frequency: 55MHz(Max.) 6)Line inversion b. P03(LH168A05) Feature: 1)6 bit digital input(262,144 colors) 2)Dual port input 3)10 reference voltages 4)384 output 5)Shift clock frequency: 55MHz(Max.) 6)Line inversion 2)Gate driver a. P01(LH169402) Feature: 1)256 output 2)Output si