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Effects of Ultraviolet-Light on Polyimide Films for Liquid Crystal Alignment

Published online by Cambridge University Press:  10 February 2011

Shaoqin Gong ,
Jerzy Kanicki ,
Lan Ma  and
John Z. Z. Zhong
Shaoqin Gong
Affiliation:
Center for Display Technology and Manufacturing, The University of Michigan, Ann Arbor, MI 48109 Department of Materials Science and Engineering, The University of Michigan, Ann Arbor
Jerzy Kanicki
Affiliation:
Center for Display Technology and Manufacturing, The University of Michigan, Ann Arbor, MI 48109
Lan Ma
Affiliation:
OIS Optical Imaging Systems, INC., 47050 Five Mile Road, Northville, MI 48167
John Z. Z. Zhong
Affiliation:
OIS Optical Imaging Systems, INC., 47050 Five Mile Road, Northville, MI 48167
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Abstract

UV-light effects on the polyimide films have been studied by characterizing the film property changes and by measuring the liquid crystal pretilt angle. Infrared, UV-visible and X-ray photoelectron spectroscopy measurements indicate that bond-breaking and oxidation occur during broadband UV-illumination of the film in the air. Free radicals are formed during UV-illumination as evidenced by the analysis of electron spin resonance spectra. Surface tension and polarity are increased after UV-illumination based on the contact angle measurements. While the pretilt angle on the rubbed polyimide film is decreased after nonpolarized UV-illumination, polarized UV-light generates a relatively small pretilt angle on a nonrubbed surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 508: Symposium B – Flat Panel Display Materials - 1998 , January 1998 , 229
Copyright
Copyright © Materials Research Society 1998

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