Optical birefringent film by photoreactive high- and low-molecular liquid crystal composites

Nobuhiro Kawatsuki; Takeya Sakai; Ann Ming Xing; Takako Hasegawa; Tohei Yamamoto

doi:10.1117/12.449940

11 December 2001 Optical birefringent film by photoreactive high- and low-molecular liquid crystal composites

Nobuhiro Kawatsuki, Takeya Sakai, Ann Ming Xing, Takako Hasegawa, Tohei Yamamoto

Proceedings Volume 4463, Liquid Crystals V; (2001) https://doi.org/10.1117/12.449940
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Nobuhiro Kawatsuki, Takeya Sakai, Ann Ming Xing, Takako Hasegawa, and Tohei Yamamoto "Optical birefringent film by photoreactive high- and low-molecular liquid crystal composites", Proc. SPIE 4463, Liquid Crystals V, (11 December 2001); https://doi.org/10.1117/12.449940

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available