Increasing the rewriting speed of optical rewritable e-paper by selecting proper liquid crystals |
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| Institution: | Geng Yu a)b),Sun Jiatong b),Anatoli Murauski b),Vladimir Chigrinov b),and Kwok Hoi Sing 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 |
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| Abstract: | The effect of interaction between liquid crystal(LC) and photoalignment material on the speed of optical rewriting process is investigated.The theoretical analysis shows that a smaller frank elastic constant K 22 of liquid crystal corresponds to a larger twist angle,which gives rise to a larger rewriting speed.Six different LC cells with the same boundary conditions(one substrate is covered with rubbed polyimide(PI) and the other with photo sensitive rewritable sulfuric dye 1(SD1)) are tested experimentally under the same illumination intensity(450 nm,80 mW/cm 2).The results demonstrate that with a suitable liquid crystal,the 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. |
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| Keywords: | azo-dye optical rewritable photoalignment rewriting speed |
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