The liquid crystal display device and an alignment film material for a polymer

The present invention provides a liquid crystal display device and an alignment film material for a polymer capable of suppressing the occurrence of seizure in the AC mode. The present invention has a structure in which a liquid crystal layer is interposed containing liquid crystal molecules between a pair of substrates, a liquid crystal display device having an alignment film on the liquid crystal layer side surface of at least one of the substrates, the alignment film, orientation comprising a first constitutional unit exhibiting a property of controlling alignment of the liquid crystal molecules by light irradiation, the polymer of the second constitutional unit as essential constituent units expressing regardless the property of controlling alignment of the liquid crystal molecules in the light irradiation alignment treatment by photoirradiation film formed by using the film material is a liquid crystal display device in which has been subjected.