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

doi:10.1088/1674-1056/21/8/080701

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

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