中国物理B ›› 2012, Vol. 21 ›› Issue (8): 80701-080701.doi: 10.1088/1674-1056/21/8/080701

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Increasing rewriting speed of optical rewritable e-paper by selecting proper liquid crystals

耿煜a b, 孙嘉瞳b, Anatoli Murauskib, Vladimir Chigrinovb, 郭海成b   

  1. a Center for Display Research, Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;
    b Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
  • 收稿日期:2011-11-15 修回日期:2012-01-06 出版日期:2012-07-01 发布日期:2012-07-01
  • 基金资助:
    Project supported by the Science Foundation of Hong Kong University of Science and Technology (HKUST) (Grant Nos. CERG 612208, CERG RPC07/08.EG01, CERG 612208/614408, CERG 612409, and CERG 612310).

Increasing rewriting speed of optical rewritable e-paper by selecting proper liquid crystals

Geng Yu (耿煜)a b, Sun Jiatong (孙嘉瞳)b, Anatoli Murauskib, Vladimir Chigrinovb, Kwok Hoi Sing (郭海成 )b   

  1. a Center for Display Research, Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;
    b Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
  • Received:2011-11-15 Revised:2012-01-06 Online:2012-07-01 Published:2012-07-01
  • Contact: Geng Yu E-mail:ygeng@ust.hk
  • Supported by:
    Project supported by the Science Foundation of Hong Kong University of Science and Technology (HKUST) (Grant Nos. CERG 612208, CERG RPC07/08.EG01, CERG 612208/614408, CERG 612409, and CERG 612310).

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摘要： Effect of interaction between liquid crystal (LC) and photoalignment material on speed of optical rewriting process is investigated. The theoretical analysis shows that smaller frank elastic constant K22 of liquid crystal corresponds to larger twist angle, which gives rise to larger rewriting speed. Six different LC cells with the same boundary conditions (one substrate is covered with rubbed polyimide (PI) and other with photo sensitive rewritable sulfuric dye 1(SD1)) are tested experimentally under the same illumination intensity (450 nm, 80 mW/cm2). The results demonstrate that with suitable liquid crystal, LC optical rewriting speed for e-paper application can be obviously improved. For two well known LC materials E7 (K22 is larger) and 5CB (K22 is smaller), they require 11 s and 6 s corresponding to change alignment direction for generating image information.

关键词: azo-dye, optical rewritable, photoalignment, rewriting speed

Abstract: Effect of interaction between liquid crystal (LC) and photoalignment material on speed of optical rewriting process is investigated. The theoretical analysis shows that smaller frank elastic constant K22 of liquid crystal corresponds to larger twist angle, which gives rise to larger rewriting speed. Six different LC cells with the same boundary conditions (one substrate is covered with rubbed polyimide (PI) and other with photo sensitive rewritable sulfuric dye 1(SD1)) are tested experimentally under the same illumination intensity (450 nm, 80 mW/cm2). The results demonstrate that with suitable liquid crystal, LC optical rewriting speed for e-paper application can be obviously improved. For two well known LC materials E7 (K22 is larger) and 5CB (K22 is smaller), they require 11 s and 6 s corresponding to change alignment direction for generating image information.

Key words: azo-dye, optical rewritable, photoalignment, rewriting speed

中图分类号:  (Display and recording equipment, oscilloscopes, TV cameras, etc.)

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