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报过了用于高预倾角液晶显示器的定向膜材料的研究，这类定向膜材料由侧链含长烷基链的聚酰亚胺组成，该材料对向列相液晶有很好的定向能力。液晶显示器的预倾角随烷基链长度的增加而线性增加，并能达到５°以上的预倾角。
Reported the use of oriented film materials for high pretilt liquid crystal displays. Such oriented film materials consist of polyimide with long alkyl chains on the side chains, which have good directional properties for nematic liquid crystals . The pretilt angle of the LCD increases linearly with the increase of the length of the alkyl chain, and can reach a pretilt angle of more than 5 °.