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Liquid Crystals Volume 37, 2010 - Issue 9
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Original Articles

A chemically modulated polystyrene surface for homogeneously aligned liquid crystals using various ion beam exposure angles

Jeong-Hwan Kim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
,
Hong-Gyu Park Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
,
Young-Gu Gang Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
,
Ji-Hun Lim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
,
Jeong-Yeon Hwang Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
,
Chul-Ho Ok Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
,
Dae-Shik Seo Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, KoreaCorrespondence[email protected]
,
Jeong-Min Han Department of Electronics, Seoul University, Seoul, Republic of Korea
,
Sung-Ho Kim LG Components R&D Center, Sa3-dong, Sangrok-gu, Ansan-si, Gyeonggi-do, Korea
&
Tae-Kyu Park LG Components R&D Center, Sa3-dong, Sangrok-gu, Ansan-si, Gyeonggi-do, Korea
 show all
Pages 1133-1138 | Received 11 Feb 2010, Accepted 23 Apr 2010, Published online: 09 Sep 2010
 
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Abstract

In this study, transparent polystyrene (PS) was replaced with conventional polyimide material. As a non-contact process, an ion beam (IB) bombardment process was applied to align the homogeneous liquid crystal (LC) material on the PS surfaces. Confirming the atomic force microscopy and X-ray photoelectron spectroscopy analysis, the chemical compositional changes of the IB-irradiated PS surfaces were determined as a function of the IB exposure angle although there was no effect of modulation of the physical geographic characteristics on IB-irradiated PS surfaces. Using this analysis, the optimal IB bombardment condition was determined at the IB exposure angle of 45°. Finally, the electro-optical properties of an LC cell suggest the use of PS in conventional LC alignment materials.

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