Electro-optical characteristics of photoaligned TN cell using UV alignment on the a-C:H thin film

Jeoung Yeon Hwang, Hyung Ku Kang, Chang Joon Park, Dae Shik Seo, Sung Hoon Lim, Kyu Chang Park, Jin Jang

Research output: Contribution to journalArticle

Abstract

We studied the nematic liquid crystal (NLC) alignment capability by the UV alignment method on a a-C:H thin-film surface, and investigated electro-optical performances of the UV aligned twisted nematic (TN)- liquid crystal display (LCD) with the UV exposure on a-C:H thin film surface. A good LC alignment by UV irradiation on a a-C:H thin-film surface at a layer thickness of 200A° was achieved. Also, a good LC alignment by the UV alignment method on the a-C:H thin film surface was observed at an annealing temperature of 180°C. However, the alignment defect of the NLC was observed at an annealing temperature above 200°C. Monodomain alignment of the UV aligned TN-LCD can be observed. The best electro-optical (EO) characteristics of the UV aligned TN-LCD in the photoaligned TN-LCDs was observed with oblique ion beam exposure on the a-C:H thin film surface for 1 min.

Original languageEnglish
Pages (from-to)151/[479]-161/[489]
JournalMolecular Crystals and Liquid Crystals
Volume434
DOIs
Publication statusPublished - 2005 Jan 1

All Science Journal Classification (ASJC) codes

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

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