Liquid crystal display device comprising an alignment film having a volume resistivity on one side that is greater than a volume resistivity on another side

摘要

A method for fabricating a liquid crystal display device including a TFT substrate having an alignment film formed thereon, an opposing substrate, and a liquid crystal layer sandwiched therebetween. The alignment film on the TFT substrate includes a photolytic polymer made from a first precursor including cyclobutane, and a non-photolytic polymer made from a second precursor. The method includes the steps of depositing a mixture material including the first precursor and the second precursor in which the second precursor settles more on an upper surface of the TFT substrate than the first precursor, imidizing the mixture material, and irradiating the mixture material with ultraviolet light for photo-alignment, and after irradiating, heating the mixture material to form the alignment film.

主权项

1. A liquid crystal display device comprising:
a TFT substrate in which an alignment film is formed over a pixel including a pixel electrode and a TFT; an opposing substrate which faces the TFT substrate and in which an alignment film is formed, liquid crystals sandwiched between the alignment film of the TFT substrate and the alignment film of the opposing substrate; wherein a first alignment film, either the alignment film of the TFT substrate or the alignment film of the opposing substrate, comprising a first polyimide produced via polyamide acid ester containing cyclobutane as a precursor and a second polyimide produced via polyamide acid as a precursor, a volume resistivity of the second side is larger than a volume resistivity of the first side, a photo-alignment process is applied to the first alignment film, a first side of the first alignment film is adjacent to the liquid crystals, a second side of the first alignment film is closer to one of the TFT substrate and the counter substrate than the first side, wherein the first side contains more the first polyimide than the second side contains, the second side contains more the second polyimide than the first side contains.