梯形凸起电极液晶变焦透镜

摘要

Tunable liquid crystal (LC) lenses are expected to have potential applications in image pro-cessing,optical communication,machine vision and 2D/3D switchable display due to their advantages of compact structure,low power consumption,good stability,and simple fabrication.However,the high operating voltage of tunable liquid crystal lens has been a significant technical barrier to practical applications and commercialization.In this paper,we propose a tunable liquid crystal lens with raised trapezoidal electrodes and simulate the distribution of electric field and the liquid crystal molecules using software of TechWiz LCD 3D.In addition,we compare and analyze the influence of cell gap, electrode height,trapezoidal angles and electrode width and spacing ratio on operating voltage of tuna -ble liquid crystal lens.Simulation results show that the operating voltage of liquid crystal lens can be less than 10 V when the cell gap is 10 μm.Tunable liquid crystal lens with raised trapezoidal electrode has lower operating voltage than that with planar electrode under the condition of the same focal length range and the operating voltage is reduced by 35.8％.Furthermore,the operating voltage of tunable liquid crystal lens with raised trapezoidal electrodes can be the lowest,when the electrode height takes up 40％ of the cell gap,the angle of trapezoidal electrode is 60°,electrode width and spacing ratio is 100 : 50.%液晶变焦透镜由于其结构紧凑,低功耗,性能稳定,易于制备等特点,在图像处理,光通信,机器视觉,可切换2D/3D显示等方面应用广泛,但是工作电压高阻碍了其实际应用和商业化.本文提出了一种梯形凸起电极结构的液晶变焦透镜,用TechWiz LCD 3D软件模拟了此种结构的电场和液晶分子分布,对比分析了液晶盒厚、电极高度、电极梯角和电极宽度与间隔比对液晶透镜工作电压的影响.模拟结果显示,当液晶盒厚为10μm时,液晶透镜的驱动电压可以降低到10V以内;在焦距变化范围相同的情况下,梯形凸起电极液晶透镜比传统的平面电极液晶透镜的工作电压降低了35.8％.对于梯形凸起电极结构的液晶变焦透镜,当电极高度占液晶盒厚40％,电极梯角选为60°,电极宽度与间隔比为100:50时,其工作电压最低.