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Improvement in device performance from a mixture of a liquid crystal and photosensitive acrylic prepolymer with the photoinduced vertical alignment method

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Author(s): Czung-Yu Ho, Fa-Hsin Lin, Yu-Tai Tao and Jiunn-Yih Lee

Journal: Science and Technology of Advanced Materials
ISSN 1468-6996

Volume: 12;
Issue: 6;
Start page: 065002;
Date: 2011;
Original page

ABSTRACT
In a multicomponent nematic liquid crystal (NLC) mixture of a liquid crystal (negative-type NLC) and a photosensitive acrylic prepolymer, photopolymerization upon UV irradiation induces the separation of the LC and photosensitive acrylic prepolymer layers, thereby leading to a vertical arrangement of LC molecules. In this study, we propose a simple vertical alignment method for LC molecules, by adding a chiral smectic A (SmA*) liquid crystal having homeotropic texture characteristics to an NLC mixture solution. Measurements of electro-optical properties revealed that the addition of the SmA* LC not only strengthened the anchoring force of the copolymer alignment film surface, but also significantly enhanced the contrast ratio (~73%), response time and grayscale switching performance of the device.

Tango Jona
Tangokurs Rapperswil-Jona

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