快速测试液晶器件扭曲角和光延迟的新方法  

Novel Fast Measurement Method of Twist Angle and Optical Retardation of Liquid Crystal Display

作　　者：黄霞[1] 荆海[1] 付国柱[1] 孔祥建[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所北方液晶工程研究开发中心

出　　处：《液晶与显示》2007年第4期428-432,共5页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金资助项目(No.60576056)

摘　　要：提出了一种测试扭曲角和光延迟的新方法。该方法属于单波长测试法,具有3个特点:利用具有特殊摩擦方向(一个基板平行摩擦,另一基板环形摩擦)的液晶盒(CH-LC)作为偏振转换器件;利用扇形可变光阑和光探测器,一次性测得偏振方向从0到任意角度连续变化的线偏光通过被测液晶盒后的光强和;采用求光强比的方法消除了由于测试中仪器的吸收对光强的影响。扭曲角和光延迟作为拟合参数利用琼斯矩阵推导出的拟合方程用matlab进行曲线拟合求参数得到。实验证明采用该方法测得结果准确,操作简单快速,实验设备经济。A novel method is proposed to measure twist angle and optical retardation of liquid crystal display in this paper. The new method which is one of single-wavelength methods has three characteristics. using circularly and homogeneously aligned LC cell （CH-LC） as a unique polarization-converting devicel using variable sector diaphragm and photodetector to detect the total intensity of transmitted light whose polarization direction is continuously changed from 0 °to any angle; introducing a method of measuring the total intensity ratio of the transmitted light to eliminate the influence of absorption by the polarize,analyzer,CH-LC, liquid crystal display and so on. The twist angle（φ）and optical retardation （△nd） can be derived by using Jones matrix analysis and a curve fitting where φ and And are fitting parameters. Experiment proved the result is accurate, the process of operation is fast, the devices are economical.

关 键 词：液晶器件 扭曲角 光延迟 

分 类 号：TN27[电子电信—物理电子学]