基于聚合物突起的液晶透镜阵列  

Liquid crystal lens array based on polymer protrusion

作　　者：储繁 王琼华 CHU Fan;WANG Qiong-Hua(School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《液晶与显示》2023年第1期10-17,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61927809,No.62105012)。

摘　　要：提出了一种基于聚合物突起液晶透镜阵列。该液晶透镜阵列的周期性聚合物突起上镀有氧化铟锡透明电极,利用介电层抹平相剖面,通电状态下在液晶层内部产生沿透镜孔径呈线性变化的垂直电场,在液晶层内形成了呈中心对称的梯度折射率分布,从而使液晶层对入射光线有聚焦作用。优化后的液晶透镜阵列采用较薄的液晶层,大幅缩短了液晶透镜阵列的响应时间。所提液晶透镜阵列具有工作电压较低、电极简单、基板内部侧平面化和液晶层厚度均匀等优点。仿真结果表明,通过改变驱动电压,该液晶透镜阵列的焦距可以从无穷大连续调节到1.28 mm。A liquid crystal(LC)lens array based on polymer protrusion is proposed. The indium tin oxide(ITO)electrodes are coated on periodic polymer protrusion,a dielectric layer is used for flattening phase profile,and the vertical electric field across the LC layer varies linearly over the lens aperture,which is obtained in the voltage-on state. As a result,a centrosymmetric gradient refractive index profile within the LC layer is generated,which causes the focusing behavior. As a result of the optimization,a thin cell gap which greatly reduces the switching time of the LC lens array can be achieved in our design. The main advantages of the proposed LC lens array are in the comparatively low operating voltage,the flat substrate surface,the simple electrodes,and the uniform LC cell gap. The simulation results show that the focal length of the LC lens array can be tuned continuously from infinity to 1. 28 mm by changing the applied voltage.

关 键 词：液晶透镜 聚合物突起 介电层 短焦距 

分 类 号：O753.2[理学—晶体学] O438.1[机械工程—光学工程]