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Sensors 2011, 11(5), 5402-5415; doi:10.3390/s110505402
Article

A New Dual-Frequency Liquid Crystal Lens with Ring-and-Pie Electrodes and a Driving Scheme to Prevent Disclination Lines and Improve Recovery Time

1
 and
1,2,*
1 Department of Electrical Engineering, National Chaio Tung University, Hsinchu, 30010, Taiwan 2 Institute of Imaging and Biophotonics, National Chaio Tung University, Tainan, 30010, Taiwan
* Author to whom correspondence should be addressed.
Received: 23 April 2011 / Revised: 13 May 2011 / Accepted: 15 May 2011 / Published: 18 May 2011
(This article belongs to the Section Physical Sensors)
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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.
Keywords: Dual-Frequency Liquid Crystals (DFLC); tunable LC lens; disclination lines; ring and pie electrodes Dual-Frequency Liquid Crystals (DFLC); tunable LC lens; disclination lines; ring and pie electrodes
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Kao, Y.-Y.; Chao, P.-P. A New Dual-Frequency Liquid Crystal Lens with Ring-and-Pie Electrodes and a Driving Scheme to Prevent Disclination Lines and Improve Recovery Time. Sensors 2011, 11, 5402-5415.

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