Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Liquid crystal alignment and pretilt angle generation using oblique UV light irradiation on polymer surface

경사진 자외선조사를 이용한 셀의 프리틸트각의 입사각도 의존성

  • 서대식 (숭실대학교 공과대학 전기공학과) ;
  • 한정민 (숭실대학교 공과대학 전기공학과) ;
  • 박두석 (숭실대학교 공과대학 전기공학과) ;
  • 박태규 (숭실대학교 공과대학 전기공학과) ;
  • 황율연 (한국전지 LCD 사업부 개발 그룹)
  • Published : 1998.06.01
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Abstract

In this study, we investigated the generation of pretilt angle for nematic liquid crystal (NLC) in a cell with oblique non-polarized ultraviolet (UV) light irradiation on polyimide (PI) surfaces. It was found that the monodomain alignment of the NLC is obtained in a cell with an angle of incidence of 70∼85$^{\circ}$on PI surface. We consider that the monodomain alignment of NLC is attributed to anisotropic dispersion force effect due to Photo-depolymerization of polymer on PI surfaces. Also, pretilt angle of NLC is generated about 3$^{\circ}$ with an angle of incidence of 70∼75$^{\circ}$. It is considered that the pretilt angle generation in NLC is attributed to interaction between the LC molecules and the polymer surfaces.

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