Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)
- Volume 13 Issue 11
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- Pages.950-953
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- 2000
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- 1226-7945(pISSN)
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- 2288-3258(eISSN)
Control of Pretilt Angle by UV exposure during Imidization of Polyimide for Homeotropic Alignment
수직 배향용 폴리미이드의 소성시에 UV 조사를 이용한 프리틸트각 제어
Abstract
Aligning capabilities of nematic liquid crystal(NLC) using an in-situ photo-alignment method with obliquely polarized UV exposure on a polyimide (PI) surface for homeotropic alignment were studied. The high angle for NLC can be measured by obliquely UV exposure of 30°on the PI surface for 10∼20 min. The pretilt angle of NLC generated using the in-situ photo-alignment was higher than that of a conventional photo-alignment method. Finally, we suggest that the control of pretilt angle in NLC with obliquely polarized UV exposure during imidization of the polymer for homeotropic alignment is promising method to generate high pretilt angle.
Keywords
- Nematic liquid crysial;
- polymide;
- In-situ photo-alignment method;
- pretilt angle;
- conventional photo-alignment method