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

Generation of high pretilt angle in nematic liquid crystal by using photo-alignment techniques on polyimide surfaces

광배향 기술을 이용한 액정의 고프리틸트각 발생

  • 한정민 (숭실대학교 공과대학 전기공학과) ;
  • 황율연 (숭실대학교 공과대학 전기공학과) ;
  • 이창훈 (숭실대학교 공과대학 전기공학과) ;
  • 서대식 (숭실대학교 공과대학 전기공학과)
  • Published : 1997.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

We investigated the generation of pretilt angle for nematic liquid crystal (NLC) in a cell with slanted non-polarized ultraviolet (UV) light irradiation on mixtured polyimide (PI) surfaces. It was found that the monodomain alignment of NLC is obtained in a cell with an angle of incidence of 75∼85 degrees 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 Pl surfaces. We successfully observed that the pretilt angle of NLC is generated above 5 degree with an angle of incidence of 75∼85 degree. It is considered that the pretilt angle generation in NLC is attributed to interaction between the LC molecules and the Polymer surfaces.

Keywords