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 Jan 1
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

Fingerprint

Liquid Crystals
Crystal orientation
Liquid crystals
Polyimides
Irradiation
Nematic liquid crystals
Polymers
Infrared radiation
Ultraviolet Rays

All Science Journal Classification (ASJC) codes

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

Cite this

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, .
Seo, Dae Shik ; Hwang, Lyul Yeon. / Photo-alignment techniques for liquid crystal alignment on treated orientation films. Paper presented at Proceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2), Seoul, Korea, .3 p.
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Seo, DS & Hwang, LY 1997, 'Photo-alignment techniques for liquid crystal alignment on treated orientation films' Paper presented at Proceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2), Seoul, Korea, 97/5/25 - 97/5/30, pp. 949-951.

Photo-alignment techniques for liquid crystal alignment on treated orientation films. / Seo, Dae Shik; Hwang, Lyul Yeon.

1997. 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, .

Research output: Contribution to conferencePaper

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N2 - 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.

AB - 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.

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