Photostability of liquid crystals and alignment layers

— Photostability of liquid‐crystal (LC) materials and surface alignment layers was evaluated using a UV lamp and a blue laser beam. Both organic polyimide (PI) and inorganic silicon‐dioxide (SiO2) alignment layers were studied under nitrogen environment. Two commercial TFT‐grade LC mixtures (low‐bir...

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Bibliographic Details
Published in:Journal of the Society for Information Display 2005-09, Vol.13 (9), p.805-811
Main Authors: Wen, Chien-Hui, Gauza, Sebastian, Wu, Shin-Tson
Format: Article
Language:English
Subjects:
alignment layers
inorganic SiO2
LCD projector
lifetime
Liquid crystals
photostability
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Summary:— Photostability of liquid‐crystal (LC) materials and surface alignment layers was evaluated using a UV lamp and a blue laser beam. Both organic polyimide (PI) and inorganic silicon‐dioxide (SiO2) alignment layers were studied under nitrogen environment. Two commercial TFT‐grade LC mixtures (low‐birefringence MLC‐9200‐000 and high‐birefringence TL‐216) were used for comparisons. Results indicate that SiO2 alignment layers are much more robust than PI layers, and low birefringence LCs are more stable than the high‐birefringence ones. At the He‐Cd laser wavelength (λ = 442 nm), both LC mixtures and SiO2 alignment layers are hardly damaged. To lengthen the lifetime of an LCD projector, inorganic SiO2 alignment layers, high‐optical‐density UV filter, long cutoff‐wavelength blue filter, and short‐conjugation (low birefringence) LC materials should be considered.
ISSN:1071-0922
1938-3657
DOI:10.1889/1.2080522