| 摘要 |
PROBLEM TO BE SOLVED: To provide an alignment film having excellent alignment stability of a liquid crystal and a high voltage holding ratio by application of linearly polarized light to a polyamic acid having a specific structure and then imidization under heat. SOLUTION: The photo-alignment film is obtained by: applying a polyamic acid solution on a substrate, where the polyamic acid contains, in its main chain, at least a group having unsaturated groups having 1 to 3 carbon-carbon double bonds or 1 to 4 triple bonds; vaporizing a solvent from a film formed; applying linearly polarized light to the film after the vaporization of the solvent; and then heating the film to imidize the polyamic acid. COPYRIGHT: (C)2008,JPO&INPIT
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