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


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.


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


  1. Jpn. J. Appl. Phys. v.36 no.11 Quantitative analysis of cell gap margin for uniform optical properties M.Oh-E;K.Kondo
  2. Appl. Phys. Lett. v.57 Extended Jones matrix repressentation for twisted nematic liquid crystal display at oblique incidence A.Lien
  3. SID`95 Digest No-rub multi-domain TFT-LCD using surrounding electrode method N.Koma;Y.Baba;K.Matsuoka
  4. Journal of the SID An overview of product issues in wide viewing TFT-LCDs S.H.Lee;S.H.Hong;J.M.Kim;H.Y.Kim;J.Y.Lee
  5. Asia Display`98 High transmittance, wide-viewing-angle nematic liquid crystal display controlled by fringe-field switching S.H.Lee;S.L.Lee;H.Y.Kim
  6. 전기전자재료학회논문지 v.15 no.2 IPS셀의 전압보유율 및 잔류DC특성 연구 김향율;서대식;남상희
  7. Jpn. J. Appl. Phys. v.39 Electro-optic characteristic of fringe-field switching mode depending on rubbing direction S.H.Hong;I.C.Park;H.Y.Kim;S.H.Lee
  8. 전기전자재료학회논문지 v.15 no.2 수직배향층에서의 네마틱액정의 프리틸트각 발생 서대식;김형규;이승희
  9. 전기전자재료학회논문지 v.15 no.1 유전율 이방성이 음인 액정을 이용한 이중 도메인 FFS 모드의 전기광학 특성 김향율;고재완;노정동;서대식;이승희
  10. SID`01 Digest Ultra-FFS TFT-LCD with super image quality, fast response time, and strong pressure-resistant characteristics S.H.Lee;H.Y.Kim;S.M.Lee;S.H.Hong;J.M.Kim;J.W.Koh;J.Y.Lee;H.S.Park