Control of high pretilt angle for nematic liquid crystal on homeotropic alignment layer by in-situ photoalignment method

Yong Je Jeon, Jeong Yeon Hwang, Dae Shik Seo, Sang Hee Nam, Jeong In Han

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

Pretilt angle generation and liquid crystal (LC) aligning capabilities for a nematic (N) LC with obliquely polarized UV exposure on a homeotropic polyimide (PI) surface by an in-situ photoalignment method were studied. The high pretilt angle of 300 for NLC with obliquely polarized UV exposure on the PI surface for 20 min can be achieved. The pretilt angle generated in NLC by the in-situ photoalignment method was higher than that generated by a conventional photoalignment method on a homeotropic alignment layer. Also, we suggest that the generation of pretilt angle in NLC with obliquely polarized UV exposure during imidization of the polymer for homeotropic alignment is a promising method to generate a high pretilt angle. Lastly, the good electro-optical (EO) characteristics of the photoaligned vertical alignment (VA)-liquid crystal, display (LCD) by UV exposure on the PI surface for 10 min were observed.

Original languageEnglish
Pages (from-to)269/[1879]-275/[1885]
JournalMolecular Crystals and Liquid Crystals
Volume412
DOIs
Publication statusPublished - 2004 Dec 1
EventProceedings of the 19th International Liquid Crystal Conference, ILCC2002 - Edinburgh, United Kingdom
Duration: 2002 Jun 302002 Jul 5

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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