Author： Hwang J-Y. Seo D-S. Hahn E-J.
Publisher： Taylor & Francis Ltd
ISSN： 0267-8292
Source： Liquid Crystals, Vol.29, Iss.4, 2002-04, pp. : 567-572
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Abstract
The electro-optical (EO) performances of a photoaligned vertical-alignment liquid crystal display (VA-LCD) on a copoly(4-methacryloyloxychalcone-cholesteryl methacrylate) surface for homeotropic LC alignment were studied. Good thermal stability of the synthesized photo-crosslinkable copolymer was seen during thermogravimetric analysis. A good voltage-transmittance curve and fast response time achieved in the photoaligned VA-LCD with obliquely polarized UV exposure at 30° from the vertical on the photo-crosslinkable copolymer surfaces. The EO characteristics of the photoaligned VA-LCD decreased after long time UV exposure because of dissociation of the ester linkage in the chalcone structure of the photo-crosslinkable polymer.
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