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http://dx.doi.org/10.1080/15980316.2011.567826

Liquid crystal alignment on patterned-alignment films  

Lias, Jais Bin (Department of Electrical Engineering, Faculty of Engineering, Nagaoka University of Technology)
Oo, Thet Naing (Institute for Materials Chemistry and Engineering, Kyushu University)
Yazawa, Tomohiro (Department of Electrical Engineering, Faculty of Engineering, Nagaoka University of Technology)
Kimura, Munehiro (Department of Electrical Engineering, Faculty of Engineering, Nagaoka University of Technology)
Akahane, Tadashi (Department of Electrical Engineering, Faculty of Engineering, Nagaoka University of Technology)
Publication Information
Journal of Information Display / v.12, no.2, 2011 , pp. 101-107 More about this Journal
Abstract
To come up with a bistable liquid crystal (LC) device using unpolarized UV light, single-step laser patterning on a photoalignment layer using a photomask was proposed to achieve an equilibrium configuration of LC molecules in contact with a periodically patterned substrate. The patterns were formed by stripes of alternating random planar and homeotropic anchoring on a submicrometer scale in the order of $0.5{\mu}m$. Two possible configurations of bistable LC cells that can be obtained by combining a micropatterned surface formed with alternating random-planar- and homeotropic-alignment with planar- or homeotropic-alignment surfaces were proposed. The alignment properties of the two proposed models were investigated, along with the microscopic switching behavior of micropatterned nematic LC cells.
Keywords
bistable liquid crystal; random planar alignment; unpolarized UV light; switching behavior;
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