照射UV光の偏光方向に対する液晶分子配向方向が異なる二種類の配向材の混合光配向材を用いる双安定界面の形成

概要

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A mixture of two kinds of photo-alignment materials, PMI-15 (JSR) and PI-A (Nissan Chemical Ind.) were used to obtain bistable anchoring properties as an alignment material. It was confirmed that PMI-15 and PI-A make align LC molecules parallel and perpendicular, respectively, to the polarization direction of exposed UV light. It was experimentally confirmed that the mixture of those two materials makes LC molecules align parallel or perpendicular to the polarization direction of UV light according as the expose energy of UV light. Using the two step irradiation method of a polarized UV light through the micro stripe photo mask, the patterns with a period of 5μm were formed by stripes of alternating parallel and orthogonal alignments to the polarization direction of UV light. Using the counter substrate on which a vertical alignment material was coated, the sample cell was prepared. It was confirmed that the LC molecules were aligned in directions of ±30deg. with respect to the polarization direction of UV light.
2010-04-30