Abstract
In this work, synthesis of a photo-crosslinkable polyimide (polyimide (PI)-chalcone(Chal)-biphenyl (BP)) based polymer and electro-optical (EO) performances of photoaligned twisted nematic (TN) - liquid crystal displays (LCDs) using the two kinds of the photodimerization method with obliquely polarized UV exposure on a photopolymer were investigated. High pretilt angle of the NLC was measured by polarized UV exposure using the conventional photodimerization method on the PI-Chal-BP surface for 3 min. The high pretilt angle of the NLC generated in NLC is attributable to the biphenyl moieties and the photodimerized chalcone group of the photopolymer. The NLC pretilt angle using the conventional photodimerization method was higher than that of a in-situ photodimerization method. Additionally, good voltage-transmittance (V-T) curves and response time for the photoaligned TN-LCD were observed by UV exposure on the PI-Chal-BP surface for 3 min using conventional photodimerization method. However, EO characteristics of the photoaligned TN-LCD on the PI-Chal-BP surface for 1 min using the in-situ photodimerization method were achieved.
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