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Cell Gap Dependent Electrode-Optic Characteristics of Fringe-Field Switching Mode using a Liquid Crystal with Negative Dielectric Anisotropy

유전율 이방성의 음인 액정을 이용한 Fringe-Field Switching mode의 cell gap 변화에 따른 전기광학 특성

  • 정송희 (전북대학교 신소재공학부) ;
  • 김향율 (전북대학교 신소재공학부, BOE-HYDIS, TECHNOLOGY CO., LTD) ;
  • 이종문 (전북대학교 신소재공학부) ;
  • 이승희 (전북대학교 신소재공학부)
  • Published : 2003.10.01

Abstract

The FFS (fringe-field switching) mode was known to exhibit both a wide viewing angle and high transmittance, especially when using a liquid crystal with negative dielectric anisotropy. We have studied cell gap-dependent electrode-optic characteristics of the FFS mode using the LC with negative dielectric anisotropy. In case of a small cell gap of 2 ${\mu}$m, the transmittance at the center of pixel and common electrodes is relatively low because effect of surface anchoring that holds the LC to the initial state is larger than that in a large cell gap of 4 .urn such that the LCs in those regions cannot rotate enough. However, in case of a large cell gap of 4 .urn, the effect of surface anchoring becomes relatively small so that the LCs at the center of pixel and common electrode can be twisted enough by applied voltage, giving rise to high transmittance. Therefore, we can conclude that the light efficiency is dependent on the cell gap.

Keywords

Fringe-field switching;Liquid crystal;Cell gap;Electro-optic characteristics;Transmittance

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