Patent ID: 8576362

Claim:
A liquid crystal display device comprising: a pair of substrates; a liquid crystal layer comprising liquid crystal molecules; and an alignment film, the liquid crystal layer being interposed between the pair of substrates, the alignment film being arranged on a liquid crystal layer side-surface of at least one of the pair of substrates, wherein the alignment film is obtainable by providing a film with an alignment treatment by photoirradiation, the alignment film being formed from an alignment film material, the alignment film material including a copolymer containing a first constitutional unit and a second constitutional unit, wherein a structure of the first constitutional unit is different than a structure of the second constitutional unit before and after the photoirradiation; the first constitutional unit exhibiting a property of controlling alignment of the liquid crystal molecules by photoirradiation, and the second constitutional unit exhibiting the property of controlling alignment of the liquid crystal molecules regardless of photoirradiation.