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
Authors: Kao, Yung-Yuan
Chao, Paul C-P.
Institute of Imaging and Biomedical Photonics
Department of Electronics Engineering and Institute of Electronics
Issue Date: 1-May-2011
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.
URI: http://dx.doi.org/10.3390/s110505402
ISSN: 1424-8220
DOI: 10.3390/s110505402
Journal: SENSORS
Volume: 11
Issue: 5
Begin Page: 5402
End Page: 5415
Appears in Collections:Articles