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

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지

Liquid crystal alignment and pretilt angle generation in the cell using linearly polarized UV light Irradiation on polymer surface

고분자막에 직선편광된 자외선 조사를 이용한 셀의 액정배향과 프리틸트각의 발생

  • 서대식 (숭실대학교 공과대학 전기공학과) ;
  • 이정호 (숭실대학교 공과대학 전기공학과) ;
  • 이창훈 (숭실대학교 공과대학 전기공학과)
  • Published : 1998.06.01
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Abstract

The liquid crystal (LC) alignment and pretilt angle generation using photo-alignment method were investigated in this study. We obtained that the monodomain alignment of nematic(N) LC increases with increasing irradiation time in a cell with linearly polarized ultraviolet (LPUV) light irradiation on polyimide (Pl) surfaces. We consider that the monodomain alignment is able to be anisotropic dispersion force due to photo-depolymerization of polymer with LPUV light irradiation on Pl surface. Also, we observed that the uniform alignment of NLC is obtained in a cell with normally LPUV light irradiated on Pl surface at 30 min. and then oblique LPUV is secondly irradiated on Pl surfaces rotated by 90$^{\circ}$. The pretilt angle of NLC is generated about 1.5$^{\circ}$ with oblique angle 60$^{\circ}$.

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