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Chin. Phys. B, 2012, Vol. 21(8): 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

Geng Yu (耿煜)a b, Sun Jiatong (孙嘉瞳)b, Anatoli Murauskib, Vladimir Chigrinovb, Kwok Hoi Sing (郭海成 )b
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
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.
Keywords:  azo-dye      optical rewritable      photoalignment      rewriting speed  
Received:  15 November 2011      Revised:  06 January 2012      Accepted manuscript online: 
PACS:  07.07.Hj (Display and recording equipment, oscilloscopes, TV cameras, etc.)  
Fund: 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).
Corresponding Authors:  Geng Yu     E-mail:  ygeng@ust.hk

Cite this article: 

Geng Yu (耿煜), Sun Jiatong (孙嘉瞳), Anatoli Murauski, Vladimir Chigrinov, Kwok Hoi Sing (郭海成 ) Increasing rewriting speed of optical rewritable e-paper by selecting proper liquid crystals 2012 Chin. Phys. B 21 080701

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