液晶响应速度_1306.pptVIP

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液晶响应速度_1306.ppt

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Fast Response Liquid Crystals LCD TV :video rate (τrise+ τdecay16ms) Color-sequential display (τrise+ τdecay5ms) Small tilt angle approximation: d:cell gap r1:rotation viscosity K:elastic const. Vth:threshold voltage Vb:bias voltage V:applied voltage Response Time 1.Temperature effect 2.Material Effects Viscosity effect Elastic constant effect Birefringence effect 3.Voltage Effect Bias voltage effect Overdrive effect Undershoot 4.Surface Stabilization Effect 5.Cell Gap Effect 6.?-cell 7.Blinking backlight/Scanning backlight/Black Frame insertion/Gray frame insertion /Black data insertion/Increase frame rate How to improve response time Temperature effect These properties (table shown below) are closely related OCF3 group :Good Candidate Macroscopic properties of LC τrise τdecay?1/K Homeotropic cell:K33 Twist cell:K22 Homogeneous cell:K11 K33K11K22 for most nematics Elastic Constant Effect τ~d2,but d· ? n=constant? τ ~1/(? n)2 i.e. larger ? n for thinner cell Birefringent Effect ?n 1.Bias Voltage effect:Vb VbVth: LC molecules are already tilted to a certain degree by Vb. Thus, they quickly follow the incoming activation pulses.The higher the Vb, the faster the response time. 2.Overdrive voltage τrise~ τpulse 3.Undershoot driving scheme Shorten τdecay Voltage Effect V Time V2 V1 V3 1 →2 1 →3 V2 Overdrive–Voltage effectEx : 1→2 ? 1 → 3 → 2 In PSNLC PSCT display Polymer network ?alignment force due to the surface effect?shorten τdecay Surface Stabilization τ?d2 Ex. d=4?m, response time =30ms and how to achieve 16ms by using cell gap reduction? Cell Gap Effect Optical comparison Response time: TN MVA~IPS Ferroelectric LCD, e.g. Surface-Stabilized Ferroelectric LC (SSFLC) 1.~100?s range 2.Bistable Ideal Candidate 1. DC voltage effect: Accumulation of ions, and causes serious image sticking after prolonged operation. 2. Thin cell: Limit manufaturing yield SSFLC Problems