| abstract |
A liquid crystal alignment agent is provided. The liquid crystal alignment agent contains diamines showed in the formula (I), polyamide acids, or derivatives thereof. The polyamide acids are synthesized by reacting a mixture of the diamines and other diamines with dicarboxylic anhydrides. The liquid crystal alignment agent is used in the formation of a liquid crystal alignment film of a liquid crystal display device having various display driving methods. The liquid crystal display device using the liquid crystal alignment film has high voltage retention rate and long-term light reliability, and restrains residual direct current. In formula (I), A1 is single bond, -O-, -COO-, -CO-, -CONH-, or alkylene groups having 1 to 6 carbons; R is hydrogen or alkyl groups having 1 to 6 carbons, independently. |