Investigation of liquid crystal alignment and pretilt angle generation in the cell with linearly polarized UV light irradiation on polymer surface

Dae Shik Seo, Chang Hoon Lee

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

We have investigated the generation of pretilt angle in nematic liquid crystal (NLC) and electro-optical (EO) characteristics of photo-aligned TN-LCD with polarized ultraviolet (UV) light irradiated on polyimide (PI) surface. It was found that the LC alignment capability increases with increasing the UV light irradiation time. In case of the fact that the polarized UV light of oblique angle of 60° irradiated on PI surface rotated by 90° at 10 min. after being normally irradiated on PI surface at 30 min., the generated pretilt angle of NLC is about 1.5°. Also, we obtained that the pretilt angle in NLC strongly depends on oblique angle and UV light irradiation time. We considered that the pretilt angle of NLC is attributed to the interaction between the LC molecules and the polymer surface due to photo-depolymerization of polymer. Finally, we measured that the EO characteristics of photo-aligned TN-LCD is almost same in comparison to rubbing-aligned TN-LCD.

Original languageEnglish
Pages (from-to)867-880
Number of pages14
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume329
Publication statusPublished - 1999 Dec 1
EventProceedings of the 1998 17th International Liquid Crystal Conference - Strasbourg, France
Duration: 1998 Jul 191998 Jul 24

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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