Title

Ultraviolet Stability Of Liquid Crystal Alignment Layers And Mixtures

Abstract

The UV stability of empty liquid crystal (LC) cells incorporating commercial polyimide (PI) and silicon-dioxide (SiO 2) 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 (λ∼365 nm) illumination at intensity I∼350 mW/cm 2. Two commercial TFT-grade LC mixtures (low birefringence MLC-9200-000 and high birefringence TL-216) exhibit a longer lifetime in SiO 2 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 SiO 2 layers, high optical density UV filter, longer cutoff-wavelength blue filter, and low birefringence LC materials should be considered.

Publication Date

8-22-2005

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

5740

Number of Pages

67-75

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.588655

Socpus ID

23744464499 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/23744464499

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