Abstract
A photo‐stable azo dye photoalignment surface for liquid crystal is proposed and demonstrated. The alignment surface has a structure of stacking a thin photo‐polymerisable liquid crystal polymer on top of an azo dye photoalignment layer. The liquid crystal polymer acts as a passivation layer for the azo dye alignment layer. The alignment direction of the azo dye cannot be rewritten once the liquid crystal polymer is polymerized. Hence, the synthetic alignment surface is robust, highly reproducible and has excellent stability. In addition, measurement results show the alignment properties of this synthetic alignment surface are comparable to conventional polyimide. As a result, the proposed alignment layer is suitable for in plane switching liquid crystal display which requires high anchoring energy and very small residual direct current.
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