四路电压驱动液晶可变光阑的器件性能  

Properties of four voltage driven liquid crystal variable diaphragm

作　　者：周心晨 谭奇璞 李光勇 尹伊 陈晓西 ZHOU Xin-cheng;TANG Qi-pu;LI Guang-yong;YIN Yi;CHEN Xiao-xi(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学光电科学与工程学院,四川成都611731

出　　处：《液晶与显示》2022年第8期1079-1085,共7页Chinese Journal of Liquid Crystals and Displays

基　　金：四川省科技厅项目(No.2020yj0327)。

摘　　要：为了实现适用性更好的尺寸、椭圆率和中心可变的光阑,本文设计了一种基于四路电压驱动的液晶器件的可变光阑,通过数值计算和实验测试对液晶器件有效光阑区域的特性进行研究。通过数值计算仿真器件分布特性,得到器件不同工作状态的电压条件及光阑中心移动方法的仿真结果;通过光路搭建测试器件的光阑特性,达到了圆形光阑和椭圆光阑分布的效果;对比了移动电场后器件中心的变化与仿真结果。测试结果表明:通过改变电压的幅值和相位的方式可以控制液晶光阑的工作状态。在上下基板电极频率不同、初始相位差不同的条件下基本实现了不同椭圆率的光阑效果。在有效区域内,中心平移测量实际值与仿真结果的平均误差为3.33%。器件基本满足不同孔径通光和场景内移动光阑中心的需求。A novel low-voltage driven liquid crystal diaphragm driven by four-channel voltage is designed and prepared to realize the elliptical ratio,scale and center variable diaphragm with better applicability.The characteristics of the circular effective diaphragm region of the liquid crystal device are tested by experi⁃ment and numerical simulation software.Firstly,through numerical calculation and simulation of the distri⁃bution characteristics of the device,the simulation results of the voltage conditions of the device in different working states and the method of moving the center of the diaphragm are obtained.Then,the diaphragm characteristics of the device are tested through the optical path to achieve the distribution effect of the cir⁃cular diaphragm and the elliptical diaphragm.Finally,the change of the optical axis of the device after mov⁃ing the electric field is compared with the simulation results.The test results show that the working state of the liquid crystal diaphragm can be controlled by changing the amplitude and phase of the voltage.Under the conditions of different frequency of upper and lower substrate electrodes and different initial phase differ⁃ence,the elliptical aperture transmission function is basically realized.In the effective region,the average error between the actual value of center translation measurement and the simulation result is 3.33%.The device basically meets the requirements of different aperture pass and moving aperture center in the scene.

关 键 词：电场仿真 液晶可变光阑 电场移动 

分 类 号：O753.2[理学—晶体学]