title: A new dual-frequency liquid crystal lens with ring-and-pie electrodes and a driving scheme to prevent disclination lines and improve recovery time.
abstract: 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.
authors.affiliation: Department of Electrical Engineering, National Chaio Tung University, Hsinchu, 30010, Taiwan. yungyuan.kao@gmail.com
authors.forename: Yung-Yuan
authors.initials: YY
authors.lastname: Kao
authors.forename: Paul C-P
authors.initials: PC
authors.lastname: Chao
mesh_terms: D004566:Electrodes; D004867:Equipment Design; D007909:Lenses; D050866:Liquid Crystals / Q000737:chemistry*