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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,*
Received: 23 April 2011; in revised form: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

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(5):5402-5415.

Chicago/Turabian Style

Kao, Yung-Yuan; Chao, Paul C.-P. 2011. "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 11, no. 5: 5402-5415.



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