Investigation of electro-optical characteristics of photo-aligned TN-LCDs on PCEMA surfaces

Jeoung-Yeon Hwang Dept. of Electrical and Computer Engineering, College Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea

Dae-Shik Seo Dept. of Electrical and Computer Engineering, College Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul 120-749, Korea

Obom Kwon Dept. of Industrial Chemistry, Hanyang University, 17 Hangdang-dong, Seongdong-ku, Seoul 133-791, Korea

Dong Hack Suh Dept. of Industrial Chemistry, Hanyang University, 17 Hangdang-dong, Seongdong-ku, Seoul 133-791, Korea

Eun-Joo Hahn Dept. of Physics, The University of Suwon, Kyungki 445-743, Korea

Abstract

In this work, a novel photo-alignment material, poly(cinnamolyethyl methacrylate) (PCEMA), was synthesized by photo-dimerization. We investigated the electro-optical characteristics of twisted nematic (TN)-liquid crystal displays (LCDs) photo-aligned with linearly polarized UV light irradiation at normal direction on the PCEMA surfaces. Excellent voltagetransmittance characteristics were observed. The threshold voltage of the photo-aligned TN-LCD decreases with increasing UV irradiation time. Additionally, response times are almost the same as for a rubbing-aligned TN-LCD.

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Investigation of electro-optical characteristics of photo-aligned TN-LCDs on PCEMA surfaces

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Investigation of electro-optical characteristics of photo-aligned TN-LCDs on PCEMA surfaces

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