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A novel patterning technique of the liquid crystal (LC) alignment by controlling the azimuthal anchoring energy is proposed. The uniformly rubbed polyvinyl cinnamate (PVCi) surface is irradiated with nonpolarized UV light to increase the anchoring energy. The uniformly rubbed polyimide (PI) surface with strong anchoring is prepared as a counter alignment substrate. When the easy axes of the two substrates are perpendicular, LC molecules twist at about 90° on the PVCi surface irradiated with UV light. On the other hand, the homogeneous orientation is observed on the surface without the UV irradiation, since the anchoring is too weak to form twisted orientation.
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Yamaguchi et al. (2002) studied this question.
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