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Electro-Optic Characteristics of the Dual Domain Fringe-Field Switching(FFS) Mode using the Liquid Crystal with Negative Dielectric Anisotropy

유전율 이방성이 음인 액정을 이용한 이중 도메인 FFS 모드의 전기광학 특성

  • 김향율 (Hydis, Cell 공정기술그룹) ;
  • 고재완 (Hydis, Cell 공정기술그룹) ;
  • 노정동 (Hydis, Cell 공정기술그룹) ;
  • 서대식 (연세대학교 전기전자공학과) ;
  • 이승희 (전북대학교 신소재공학부)
  • Published : 2002.08.01

Abstract

The fringe-field switching (FFS) mode was known to exhibit both a wide viewing angle and high transmittance, especially when using the liquid crystal (LC) with negative dielectric anisotropy. In the device, the LC director rotates almost in-plane. However, in the bright state the device shows bluish and yellowish color along parallel and perpendicular to the LC director at off-normal directions since the LC director rotates only in one direction. Such a problem was greatly improved using a wedge shape of only pixel electrodes. In this way two different field directions exist in a pixel, enabling the LC director to rotate in two opposite directions. Consequently, owing to dual domain effect when using the LC with negative dielectric anisotropy, the viewing angle characteristics are greatly improved.

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