Title

Photostability of liquid crystals and alignment layers

Authors

Authors

C. H. Wen; S. Gauza;S. T. Wu

Comments

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Abbreviated Journal Title

J. Soc. Inf. Disp.

Keywords

liquid crystals; photostability; lifetime; alignment layers; inorganic; SiO2; LCD projector; DISPERSIONS; Engineering, Electrical & Electronic; Materials Science, ; Multidisciplinary; Optics; Physics, Applied

Abstract

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 (gimel = 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.

Journal Title

Journal of the Society for Information Display

Volume

13

Issue/Number

9

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

805

Last Page

811

WOS Identifier

WOS:000236283000016

ISSN

1071-0922

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