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Optical Materials Express

Optical Materials Express

  • Editor: David Hagan
  • Vol. 4, Iss. 5 — May. 1, 2014
  • pp: 1057–1066

Surface rheology of rubbed polyimide film in liquid crystal display

Yuichi Momoi, Osamu Sato, Tomonori Koda, Akihiro Nishioka, Osamu Haba, and Koichiro Yonetake  »View Author Affiliations

Optical Materials Express, Vol. 4, Issue 5, pp. 1057-1066 (2014)

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The rheological properties of polyimide film surfaces have an important influence on contrast reduction during the in-plane switching mode of liquid crystal displays. To clarify these properties, the slight difference of deviation angles of liquid crystal directors from the rubbing direction were measured during prolonged exposure to alternating electric fields. The results indicate that the data can be well described using the Kelvin-Voigt model. The relation between the in-plane shear modulus G and the strain at the polyimide surface was also investigated based on the torque balance between the energy density of the electric field and the elastic energy density of the polyimide surface. It was found that much smaller G than bulk polyimide materials existed on the polyimide surface in liquid crystal display.

© 2014 Optical Society of America

OCIS Codes
(160.3710) Materials : Liquid crystals
(160.5470) Materials : Polymers
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Liquid Crystals

Original Manuscript: February 28, 2014
Revised Manuscript: March 21, 2014
Manuscript Accepted: March 21, 2014
Published: May 1, 2014

Virtual Issues
Optical Materials for Flat Panel Displays (2013) Optical Materials Express

Yuichi Momoi, Osamu Sato, Tomonori Koda, Akihiro Nishioka, Osamu Haba, and Koichiro Yonetake, "Surface rheology of rubbed polyimide film in liquid crystal display," Opt. Mater. Express 4, 1057-1066 (2014)

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