The strength of rubbing worked on polyimide films for aligning nematic and chiral smectic liquid crystals: controlling pretilt angles and some electrooptic performances of LCDs

The degree of work done on polyimide films in the rubbing process with a nylon fabric was detected and evaluated in terms of induced birefringence. Strong and weak rubbing (effecting two extremes) gave rise to the optical retardation of 1 degree and 0.1 degree, respectively, with a resolution of 0.1...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 27; no. 5; pp. 827 - 829
Main Authors KUNIYASU, S, FUKURO, H, MAEDA, S, NAKAYA, K, NITTA, M, OZAKI, N, KOBAYASHI, S
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 01.05.1988
Subjects
Applied sciences
Electronics
Exact sciences and technology
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Polyimide
Wall
Stabilization
Optical bistability
Liquid crystals
Surface
Processing control
Alignment
Ferroelectric materials
Friction
Nematic state
Measurement method
Deformation birefringence
Cell
Acoustooptical modulator
Induced conformation
Display
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Summary:The degree of work done on polyimide films in the rubbing process with a nylon fabric was detected and evaluated in terms of induced birefringence. Strong and weak rubbing (effecting two extremes) gave rise to the optical retardation of 1 degree and 0.1 degree, respectively, with a resolution of 0.1 degree. Generation of a pretilt angle of up to 10 degrees (even up to 30 degrees) for nematic liquid crystals was achieved by performing weak rubbing in a specially synthesized polyimide which was successfully used to fabricate supertwisted nematic liquid crystal displays. Fairly good bistability in a ferroelectric liquid crystal device was obtained by weak rubbing.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.27.827