Photo-alignment techniques for liquid crystal alignment on treated orientation films

Dae Shik Seo, Lyul Yeon Hwang

Research output: Contribution to conferencePaper

Abstract

We investigated the pretilt angle generation by linearly polarized ultraviolet (UV) irradiation for nematic liquid crystal (NLC) on rubbed polyimide (PI) surfaces. The pretilt angle of 4-n-penty-4-cyanobiphenyl (5CB) increased linearly with the duration of irradiation of UV light polarized parallel to the rubbing direction on rubbed PI surfaces with trifluoromethyl moieties. But, the pretilt angle of 5CB decreased linearly with the duration of UV irradiation polarized parallel to the rubbing direction on standard rubbed PI surfaces with side chains. We obtained infrared (IR) spectra demonstrating clear changes in the PI structure upon irradiation with linearly polarized UV light. Therefore, we conclude that the pretilt angle of NLC is changed by changer in the structure of polymer surface upon irradiation with linearly polarized UV light.

Original languageEnglish
Pages949-951
Number of pages3
Publication statusPublished - 1997
EventProceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2) - Seoul, Korea
Duration: 1997 May 251997 May 30

Other

OtherProceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2)
CitySeoul, Korea
Period97/5/2597/5/30

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

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    Seo, D. S., & Hwang, L. Y. (1997). Photo-alignment techniques for liquid crystal alignment on treated orientation films. 949-951. Paper presented at Proceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2), Seoul, Korea, .