LCD-驱动IC原理简介

1、LCD 驅動IC原理簡介,David Tsai,Outline,Introduction of LCD Driving Theory TN/STN LCD Driver AM-LCD Gate Driver AM-LCD Source Driver AM-LCD Driver Design Consideration,LC & LCD Type,Liquid Crystal,Semectic LC Nematic LC Cholesteric LC Disk LC,Liquid Crystal Display,Twist Nematic (TN) Super Twist Nematic (ST

2、N) Double-layer STN (DSTN) Film STN (FSTN) In Plane Switch (IPS) Vertical Alignment (VA) Multi-domain VA (MVA),LCD Driving Theory TN type,TN & STN V-T Transfer Curve,Static Driving Method Used in TN,Static Driving Example,STN LCD Driving Diagram,STN LCD Driving Waveform Diagram,Column 1,暗,亮,亮,Limita

3、tion on STN LCD Resolution,= Selection Ratio,Multiplex Addressing Method,電位皆為正 製程較容易,Multiplex Addressing Block,Frame Rate Control - Temporal Dithering,Frame Rate Control Spatial Dithering,Frame Rate Control PWM,變快,難做,Crosstalk of STN LCD (1) - Stripe Shadowing,segment,common,* Pixel = common-segmen

4、t *,common,segment,Crosstalk of STN LCD (2) - Block Shadowing,Scope of STN Driver,All-in-One LCD Driver Chip Low Power Consumption for Mobile Phone Application Programmable Voltage for Different Type Panel and System Application 4. Stable Reference Output for Different Temperature Coefficients,Power

5、 Management of STN Driver,TFT LCD Operation Architecture,產生 timing,Video Signal Timing Specification,Video Signal Timing Specification,TFT LCD Pixel Schematic - Cs on Common,Clc:,TFT LCD Pixel Schematic - Cs on Gate,Gate Pulse Transmission Delay,LCD Gate Driver Block Diagram - 2-level,DI/O CLOCK 256

6、 / 263 Output enable,2-Level Gate Driver Timing Diagram,Start pulse,When OE = H OUT = L,When XAO = L OUT = H,LCD Gate Driver Block Diagram - 3-level,YV1 YV2 YV3,3-Level Gate Driver Timing Diagram,Gate Cell Cross-coupling - Cs on Common,Gate Cell Cross-coupling - Cs on Gate,TFT LCD Driving Method,Com

7、parison of Power Consumption,Direct Driving,AC Modulation Driving,LCD Source Driver Block Diagram,極性 Gama電壓,R10 to R17 / R20 to R27 G10 to G17 / G20 to G27 B10 to B17 / B20 to B27,Source Driver Timing Diagram,Horizontal Crosstalk (1),Horizontal Crosstalk (2),Frame/Line Inversion Charging Path,亮,暗,V大

8、 V中 V小,Column/Dot Inversion Charging Path,V cancel V cancel V cancel,Comparison of Addressing Method,Source Driver Structure - Digital,Source Driver Consideration,Performance Requirement : Output Accuracy (6 bits? 8 bits? or more?) Power Consumption (portable?) Die Size (Cost ! ),High Accuracy Resistor String Digital Method to Reduce Power Power Arrangement Reduce Decoder Size Output Structure to Reduce Chip Size