In this study, a photo-alignment material PM4Ch, poly(4-methacryloyloxychal
cone), was synthesized. The electro-optical characteristics of a photo-alig
ned twisted nematic liquid crystal display (TN-LCD), with linearly polarize
d UV exposure at normal direction on a PM4Ch surface, were investigated. Th
e NLC alignment was uniform. Excellent voltage-transmittance characteristic
s were obtained; a fast response time was also achieved. Reduction of d.c.
voltage decreases with increasing UV exposure time.