LCD-驱动IC原理简介.ppt

TFT LCD Driving Method Comparison 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 * 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 (STN) 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 Limitation on STN LCD Resolution = Selection Ratio = N = SR Multiplex Addressing Method Pulse Amplitude 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-segment * 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 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 / 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 Ce