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Proceedings Paper

Ultraviolet stability of liquid crystal alignment layers and mixtures
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Paper Abstract

The UV stability of empty liquid crystal (LC) cells incorporating commercial polyimide (PI) and silicon-dioxide (SiO2) alignment layers under nitrogen environment and the vacuum-filled LC cells were studied. Experimental results show that the molecular alignment of PI cells is degraded after 10 hours of UV (l~365 nm) illumination at intensity I~350 mW/cm2. Two commercial TFT-grade LC mixtures (low birefringence MLC-9200-000 and high birefringence TL-216) exhibit a longer lifetime in SiO2 cells than in PI cells. Moreover, MLC-9200-000 has a much longer lifetime than TL-216. To lengthen the lifetime of a LCD projector, UV transparent PI layers or inorganic SiO2 layers, high optical density UV filter, longer cutoff-wavelength blue filter, and low birefringence LC materials should be considered.

Paper Details

Date Published: 10 April 2005
PDF: 9 pages
Proc. SPIE 5740, Projection Displays XI, (10 April 2005); doi: 10.1117/12.588655
Show Author Affiliations
Chien-Hui Wen, College of Optics and Photonics/Univ. of Central Florida (United States)
Sebastian Gauza, College of Optics and Photonics/Univ. of Central Florida (United States)
Shin-Tson Wu, College of Optics and Photonics/Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 5740:
Projection Displays XI
Ming H. Wu, Editor(s)

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