2A17 PI系材料を用いた光配向法の原理解析と高プレティルト化

概要

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We have investigated and modelized mechanism of photo-induced LC alignment using PI films by measuring IR and UV absorption spectra and observing the LC alignment direction depending on the wavelength of irradiated UV light. We have been engaged in the research on generating high pretilt angles for practical use such as TN-LCD. We found that the high pretilt angle was generated by introducing "bulky repeating units" having long chain alkyl branches and the pretilt angle can be controlled by adjusting the concentration of these units. Two methods were adopted to introduce the "bulky repeating units" into the polyimide structure; one is the chemically copolymerization method and the other is only adding and mixing these units. Almost the same effect for generating the high pretilt angles was obtained for both methods although there is a significant difference in degree of the obtained pretilt angles.
日本液晶学会の論文
1996-09-30