Brewster angle microscope imaging of surface inhomogeneity in liquid crystal alignment polyimide layers

Byoungchoo Park, J. W. Wu, Chi Sup Jung

Research output: Contribution to journalArticlepeer-review

Abstract

The surface structure of the polyimide alignment layer has been probed by various tools, but a direct visualization of the treated layer surface over a sizable area is lacking. We demonstrate Brewster angle microscope imaging of the micro-grooves formed on a rubbed polyimide alignment layer, compared with the flat surface image of a photo-aligned polyimide surface. Textures of cholesteric liquid crystal on these alignment layers showed that the rubbing causes a nonuniform orientational alignment of liquid crystals, in contrast to a uniform orientation in the photo-aligned cell. This tool enables early detection of surface defects in alignment layers, which would significantly reduce the failure in liquid crystal display fabrication.

Original languageEnglish
Pages (from-to)L691-L694
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume40
Issue number7 A
DOIs
StatePublished - 1 Jul 2001

Keywords

  • Alignment layer
  • Brewster angle microscopy
  • Liquid crystals
  • Photo-alignment
  • Rubbing

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