A new dual-frequency liquid crystal lens with ring-and-pie electrodes and a driving scheme to prevent disclination lines and improve recovery time

Yung Yuan Kao, Paul C.-P. Chao

Research output: Contribution to journalArticle

21 Scopus citations

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.

Original languageEnglish
Pages (from-to)5402-5415
Number of pages14
JournalSensors
Volume11
Issue number5
DOIs
StatePublished - 1 May 2011

Keywords

  • Disclination lines
  • Dual-frequency liquid crystals (dflc)
  • Ring and pie electrodes
  • Tunable lc lens

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