2007•Molecular Crystals and Liquid CrystalsRequires access

The Properties of Homeotropic Alignment Materials as the Side Chain Molecular Structure in Polyimides

Jae-Cheol Park, Dong-Ju Park, Kyung-Chul Son, Yong Bae Kim

Abstract

LCD (Liquid Crystal Display) screens are today's most commonly used displays and are available in a wide range of shapes, size, levels of quality, and models. VA-LCD is good to TV applications from among other LCD modes, owing to wide viewing angle, high contrast ratio and fast switching time. To apply for VA-LCDs, we have synthesized novel homeotropic alignment materials, which all generated high pretilt angles (> 88°) with and without rubbing. They showed good homeotropic alignment state too. In addition, response time was very fast. In this paper, we discussed the synthesis and alignment properties of new homeotropic alignment materials.

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Key concepts: Homeotropic alignment, Rubbing, Liquid-crystal display, Materials science, Liquid crystal, Side chain, Contrast ratio, Viewing angle