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Liquid crystal alignment on patterned-alignment films
Jais Bin Lias,Thet Naing Oo,Tomohiro Yazawa,Munehiro Kimura,Tadashi Akahanea 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.2
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 0.5μm. 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.
Alignment film abrasion caused by rubbing
Hirokazu Kamada,Ikuo Ihara,Hong Dae Kim,Tadachika Nakayama,Munehiro Kimura,Tadashi Akahanea 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.4
The alignment film abrasion caused by the rubbing process was quantitatively evaluated via atomic-force microscopy (AFM). First, a patterned alignment film structure, which was molded through the imprint method, was artificially formed. Then, the surface topography of the alignment film was evaluated via AFM after rubbing, and the degree of abrasion of the alignment film was estimated by subtracting the value after rubbing from the value before rubbing. It was recognized that the degree of abrasion increased with an increase in the rubbing strength. The relationship between the number of rubbing cycles and the degree of abrasion of the alignment film was also estimated.