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29.4: Homeotropic Alignment by Single Oblique Evaporation of SiO 2 and Its Application to High Resolution Microdisplays
Author(s) -
Lu Minhua,
Yang K. H.,
Nakasogi T.,
Chey S. J.
Publication year - 2000
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 - 10.1889/1.1832977
Subject(s) - homeotropic alignment , van der waals force , evaporation , anisotropy , resolution (logic) , materials science , liquid crystal , oblique case , optics , dielectric , condensed matter physics , layer (electronics) , molecular physics , optoelectronics , nanotechnology , chemistry , physics , thermodynamics , molecule , linguistics , organic chemistry , philosophy , artificial intelligence , computer science
We have discovered that single evaporation of SiO 2 can align liquid crytstal either homogeneously or homeotropically depending on the dielectric anisotropy of liquid crystal being positive or negative, respectively. Van der Waals potential taking into account the anisotropy of LC polarizabilities have been used to explain the alignment mechanism The order electricity model proposed by Monkade and Barbero et al. have been extended to qualitatively explain the generation of the pretilt angles. The observed surface morphology of the evaporated SiO 2 layer as revealed by the AFM and SEM images is consistent in support of the alignment model. We have applied our alignment method to fabricate a tilted homeotropic microdisplay with a resolution of 1024 by 1280. Its electro‐optical properties are also reported.