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34.4: Liquid Crystal Alignment Degradation Induced by Photo‐irradiation
Author(s) -
Barna Hayley,
Lu Minhua,
Samant Mahesh,
Cai Chen,
Rosenbluth Alan
Publication year - 2001
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1832036
Subject(s) - degradation (telecommunications) , tilt (camera) , irradiation , materials science , absorption (acoustics) , crystal (programming language) , liquid crystal , wavelength , optics , optoelectronics , photochemistry , chemistry , computer science , composite material , physics , mechanical engineering , telecommunications , nuclear physics , engineering , programming language
Degradation of liquid crystal alignment has been studied by monitoring the change in pre‐tilt angle as a function of UV dosage, as well as by surface analysis methods, such as NEXAFS and surface energy measurement. The mechanism of the alignment degradation was understood for the first time at the surface chemistry level. The degradation happened in two steps. First there is oxygen absorption, followed by liquid crystal attachment. In addition, we have shown that filtering out short wavelengths is effective in prolonging the lifetime of liquid crystal displays. This work is important for improving display lifetime and quality.