Ultraviolet stability of liquid crystal alignment layers and mixtures

Chien-Hui Wen; Sebastian Gauza; Shin-Tson Wu

doi:10.1117/12.588655

10 April 2005 Ultraviolet stability of liquid crystal alignment layers and mixtures

Chien-Hui Wen, Sebastian Gauza, Shin-Tson Wu

Proceedings Volume 5740, Projection Displays XI; (2005) https://doi.org/10.1117/12.588655
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

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.

Citation Download Citation

Chien-Hui Wen, Sebastian Gauza, and Shin-Tson Wu "Ultraviolet stability of liquid crystal alignment layers and mixtures", Proc. SPIE 5740, Projection Displays XI, (10 April 2005); https://doi.org/10.1117/12.588655

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