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Liquid Crystals Volume 37, 2009 - Issue 1
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Original Articles

Directional behaviour of liquid crystals on homogeneous polyimide surfaces induced by polarised ultraviolet exposure and rubbing

Hyun-Jae Na Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, Korea
,
Won-Kyu Lee Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, Korea
,
Ji-Hun Lim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, Korea
,
Byoung-Yong Kim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, Korea
,
Young-Hwan Kim Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, Korea
,
Chul-Ho Ok Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, Korea
,
Dae-Shik Seo Information Display Device Laboratory, School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodamun-ku, Seoul, 120-749, KoreaCorrespondence[email protected]
,
Sang-Do Lee 5th Floor, Doosan Technical Center, 39-3, Sungbok-Dong, Suji-Gu, Yongin-Si, Gyeonggi-Do, Korea, 448-795
,
Jae-Hoon Lee 5th Floor, Doosan Technical Center, 39-3, Sungbok-Dong, Suji-Gu, Yongin-Si, Gyeonggi-Do, Korea, 448-795
&
Jong-Gyu La 5th Floor, Doosan Technical Center, 39-3, Sungbok-Dong, Suji-Gu, Yongin-Si, Gyeonggi-Do, Korea, 448-795
 show all
Pages 109-114 | Received 31 Jul 2009, Accepted 06 Oct 2009, Published online: 12 Jan 2010
 
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Abstract

We studied liquid crystal (LCs) alignment effects on homogeneous polyimide (PI) surfaces induced by polarised UV (PUV) exposure and rubbing in different directions. We found that the LC orientation is not affected by PUV exposure times of less than 90 min after rubbing, and that PUV exposure times over 90 min after rubbing resulted in LC orientations that were more closely aligned with the direction of PUV exposure than the direction of rubbing. Short-term PUV exposure affects the variation of the pretilt angle of the PI and LC. In addition, as PUV exposure time increases, it can convert the LC alignment direction from the rubbing direction to the PUV direction.

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