Dual domain effects on a homogeneously aligned nematic liquid crystal cell driven by a fringe-field

Hyang Yul Kim, Gye Rok Jeon, Dae-Shik Seo, Myong Hoon Lee, Seung Hee Lee

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The fringe-field switching (FFS) mode is known to exhibit both a wide viewing angle and high transmittance, owing to the approximated in-plane rotation of the liquid crystal (LC) director. However, in the bright state, the device shows bluish and yellowish color parallel and perpendicular to the LC director at off-normal directions since the LC director rotates only in one direction. The degree of color shift becomes even stronger when the retardation value of the cell is high. This problem was greatly improved using a wedge shape of only pixel electrodes. These wedged shaped pixel electrodes allow two different field directions to exist in a pixel, enabling the LC director to rotate in two opposite directions. Consequently, owing to the dual domain effect with unidirectional rubbing, the color shift dependence on the viewing angle is greatly reduced.

Original languageEnglish
Pages (from-to)2944-2948
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number5 A
Publication statusPublished - 2002 May 1

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Nematic liquid crystals
Liquid crystals
liquid crystals
Pixels
pixels
Color
cells
color
Electrodes
electrodes
shift
wedges
transmittance

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "The fringe-field switching (FFS) mode is known to exhibit both a wide viewing angle and high transmittance, owing to the approximated in-plane rotation of the liquid crystal (LC) director. However, in the bright state, the device shows bluish and yellowish color parallel and perpendicular to the LC director at off-normal directions since the LC director rotates only in one direction. The degree of color shift becomes even stronger when the retardation value of the cell is high. This problem was greatly improved using a wedge shape of only pixel electrodes. These wedged shaped pixel electrodes allow two different field directions to exist in a pixel, enabling the LC director to rotate in two opposite directions. Consequently, owing to the dual domain effect with unidirectional rubbing, the color shift dependence on the viewing angle is greatly reduced.",
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Dual domain effects on a homogeneously aligned nematic liquid crystal cell driven by a fringe-field. / Kim, Hyang Yul; Jeon, Gye Rok; Seo, Dae-Shik; Lee, Myong Hoon; Lee, Seung Hee.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 5 A, 01.05.2002, p. 2944-2948.

Research output: Contribution to journalArticle

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