| 摘要 |
The long residual image characteristic of a conventional photo-orientation film material is insufficient. A liquid crystal display device comprises substrates, a liquid crystal layer, an electrode group to apply an electric field to the liquid crystal layer, and orientation control films placed between the substrates and the liquid crystal layer. Each of the orientation control films comprises a polyimide and a polyimide precursor, as materials of the polyimide and the polyimide precursor, at least one kind of first diamines, at least one kind of second diamines, and a cyclobutane tetracarboxylic dianhydride derivative are contained, and an orientation restraining force is granted by the irradiation of nearly linearly polarized light. |
| 主权项 |
1. A liquid crystal display device comprising substrates, a liquid crystal layer, an electrode group to apply an electric field to said liquid crystal layer, and orientation control films placed between said substrates and said liquid crystal layer, wherein:
each of said orientation control films comprises a polyimide and a polyimide precursor; as the materials of said polyimide and said polyimide precursor, at least one kind of diamines selected from the chemical compound group shown by the following chemical formula (1), at least one kind of diamines selected from the chemical compound group shown by the following chemical formula (2), and a cyclobutane tetracarboxylic dianhydride derivative are contained; and an orientation restraining force is granted by the irradiation of nearly linearly polarized light.
H2N-A1-NH2 (1) Here, A1 represents a divalent circular substituent.
H2N-A2Zn-A2-NH2 (2) Here, A2 individually represents a divalent circular substituent or a single bond, Z individually represents a bond group selected from the group of —(CH2)—, —(NH)—, —O—, —S—, —SiO2—, and —CO—, and n represents an integer of 1 or more. |
