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Proceedings Paper

Optical birefringent film by photoreactive high- and low-molecular liquid crystal composites
Author(s): Nobuhiro Kawatsuki; Takeya Sakai; Ann Ming Xing; Takako Hasegawa; Tohei Yamamoto
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Paper Abstract

New optical birefringent film for liquid crystal display (LCD) is described using composite materials consisting of photo-cross-linkable polymer liquid crystal (PLC) and photoreactive bifunctional monomers. The alignment of mesogenic groups in both PLC and monomers was achieved by irradiation with linearly polarized ultraviolet (LPUV) light and subsequent annealing. Axis-selective photo-cross-linking reaction of the mesogenic group in the PLC occurred by exposure with LPUV light, although the induced birefringence was very small. The annealing process generates a thermal reorientation of monomers in a direction parallel to the photo-cross-linked mesogenic groups, resulting in a reversion of the orientation direction and thermal enhancement of the alignment of the film. Since the orientation direction is parallel to the polarization direction of LPUV light, three-dimensional orientation can be feasible by oblique irradiation with LPUV light, and the angle of the molecular orientation is controlled by changing the exposure angle. By the use of this optical birefringent film, the improvement of the viewing characteristics of twisted-nematic (TN) LCD is demonstrated.

Paper Details

Date Published: 11 December 2001
PDF: 8 pages
Proc. SPIE 4463, Liquid Crystals V, (11 December 2001); doi: 10.1117/12.449940
Show Author Affiliations
Nobuhiro Kawatsuki, Himeji Institute of Technology (Japan)
Takeya Sakai, Hayashi Telempu Co., Ltd. (Japan)
Ann Ming Xing, Himeji Institute of Technology (Japan)
Takako Hasegawa, Himeji Institute of Technology (Japan)
Tohei Yamamoto, Himeji Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 4463:
Liquid Crystals V
Iam-Choon Khoo, Editor(s)

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