Department of Electrical Engineering, National Chaio Tung University, Hsinchu, 30010, Taiwan.
Sensors (Basel). 2011;11(5):5402-15. doi: 10.3390/s110505402. Epub 2011 May 18.
A new liquid crystal lens design is proposed to improve the recovery time with a ring-and-pie electrode pattern through a suitable driving scheme and using dual-frequency liquid crystals (DFLC) MLC-2048. Compared with the conventional single hole-type liquid crystal lens, this new structure of the DFLC lens is composed of only two ITO glasses, one of which is designed with the ring-and-pie pattern. For this device, one can control the orientation of liquid crystal directors via a three-stage switching procedure on the particularly-designed ring-and-pie electrode pattern. This aims to eliminate the disclination lines, and using different drive frequencies to reduce the recovery time to be less than 5 seconds. The proposed DFLC lens is shown effective in reducing recovery time, and then serves well as a potential device in places of the conventional lenses with fixed focus lengths and the conventional LC lens with a single circular-hole electrode pattern.
提出了一种新的液晶透镜设计，通过合适的驱动方案和使用双频液晶（DFLC）MLC-2048，利用环形和扇形电极图案改善恢复时间。与传统的单孔型液晶透镜相比，这种新型的 DFLC 透镜结构仅由两块 ITO 玻璃组成，其中一块设计为环形和扇形图案。对于该器件，可以通过在特别设计的环形和扇形电极图案上进行三级切换程序来控制液晶指向矢的方向。这旨在消除螺旋线，并使用不同的驱动频率将恢复时间减少到 5 秒以内。所提出的 DFLC 透镜在减少恢复时间方面非常有效，因此可以作为具有固定焦距的传统透镜和具有单个圆形电极图案的传统 LC 透镜的替代品。
