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Chemically modulated polystyrene surface using various ion beam exposure time for liquid crystal alignment of high brightness mobile display  

Cho, Myung-Hyun (서일대학교 전기과)
Lee, Ho-Young (초당대학교 정보통신공학과)
Publication Information
Journal of Satellite, Information and Communications / v.9, no.3, 2014 , pp. 22-26 More about this Journal
Abstract
This paper introduces homogeneous liquid crystal (LC) orientations on chemically modulated polystyrene (PS) surfaces using various ion beam (IB) exposure time. Transparent PS was replaced with conventional polyimde material. Especially, PS has higher transparent property than conventional polyimide thin film and it means PS is more suitable material for producing high brightness mobile LCD. As a non-contact process, IB bombardment process induced LC orientation in the direction parallel to the IB process. Through x-ray photoelectron spectroscopy, it was shown that the chemical compositional changes of the IB-irradiated PS surfaces were determined as a function of IB exposure time. Using this analysis, the optimal IB bombardment condition was determined at IB exposure time of up to 15 s. Moreover, thermal stability on IB-irradiated PS surfaces were carried out which showed that a relatively high IB exposure time induced a thermally stable LC alignment property. And it has a highly potential of mobile high transparent mobile LCD such as smart phone display and mobile information device.
Keywords
Liquid Crystal Orientation; Ion Beam; Polystyrene; X-ray Photoelectron Spectroscopy; Pretilt Angle;
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