LCoS伽马校正电路的研究  

Research of LCoS Gamma Correction Circuit

作　　者：刘会刚[1] 耿卫东[1] 高丕涛[1] 刘艳艳[1] 杨树茂[1] 

机构地区：[1]南开大学光电子薄膜器件与技术研究所光电信息技术科学教育部重点实验室,天津300071

出　　处：《半导体光电》2009年第6期958-961,965,共5页Semiconductor Optoelectronics

基　　金：天津市自然科学基金资助项目(033600711);天津市科委攻关项目(033187011)

摘　　要：提出了一种应用于硅上液晶(LCoS)的伽马校正电路。双梯电阻数模转换器是伽马校正电路的一个重要组成部分。双梯电阻数模转换器由粗分电阻级和细分电阻级组成,其最大优点是占用版图面积小。提出的10位双梯电阻数模转换器仅由80个电阻、2个4-16译码器、1个2-4译码器和一些开关组成,供电电压是5 V。该数模转换器由0.35μm CMOS工艺实现。后仿真结果表明,数模转换器的微分非线性和积分非线性分别小于±0.5 LSB和±0.4 LSB。最后,对伽马校正电路进行了仿真,给出了伽马校正电路输出的液晶伽马校正曲线,仿真结果表明伽马校正电路能够满足LCoS显示系统的要求。One gamma correction circuit for liquid crystal on silicon （LCoS） is proposed. Dual ladder resistor DAC （Digital to Analog Converter） is one of main components of the gamma correction circuit. Dual ladder resistor DAC consists of coarse resistor stage and fine resistor stage, The most advantage of the DAC is that its layout area is small. In this paper, the proposed 10-bit dual ladder resistor DAC only requires eighty resistors, two 4-to-16 decoders, one 2-to-4 decoder and some switches with a supply voltage of 5 V. This DAC is implemented by 0.35 m CMOS technology. The post simulation results that its differential non-linearity （DNL） and integral non-linearity （INL） are less than 0. 5 LSB and 0.4 LSB, respectively. Meanwhile, the gamma correct circuit was simulated, and the gamma correction curve of liquid crystal is given. Simulation results show that the gamma correction circuit can meet the requirements of LCoS display system.

关 键 词：硅基液晶显示器 伽马校正 双梯电阻数模转换器 译码器 

分 类 号：TN36[电子电信—物理电子学]