2D03 ポリイミド主鎖にアゾ基を持つ光配向膜 : (II) 無偏光斜入射光照射とレシチン添加によるプレチルト発生とデバイス特性

概要

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Director tilting of liquid crystal (LC) molecules on photosensitive alignment layers has been investigated. The layers, polyimides with photoisomerizable groups in their main chains, were irradiated with unpolarized near-UV (UPUV) light at oblique incidence. The irradiated film was found to align LC molecules homogeneously with a negligible pretilt angle. It was found that the pretilt angle can be generated successfully by introducing surfactant lecithin and decreasing the incidence angle of the UPUV light. The LC alignment and electrooptical properties of the LC cells with the photoalignment layers were demonstrated to be suitable for twisted nemafic (TN) LC, vertical alignment (VA) LC, and surface-stabilized ferroelectric LC (SSFLC) devices.
1999-09-28