Pretilt angle measurable by using the conventional crystal rotation method is limited to about 0°–20° and 70°–90°. We propose a method by which we can measure the pretilt angle by using the crystal rotation method even if the pretilt angle is between 20° and 70°. In this method, the determination of a pretilt angle is achieved by finding the rotation angles where transmittances are maximum and minimum in the periodic transmittance characteristics obtained with the variation of rotation angle.

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The photosensitive PI film composing of DOCDNDAP-Chalcone [5-2,5-dioxotetrahydro~ryl]-3-methyl-3-cyclohexene-l ,Zdicarboxylic anhydride/l,4-diaminophenoV4-n-propyl-4-(3-propylene hydroxide) chalcone] induces orientation of liquid crystal alignment perpendicular to the polarization direction. The pretilt angle of liquid crystal was about 1". It will be applied to the ferroelectric liquid crystal display.