DOI QR코드

DOI QR Code

유전율 이방성이 양인 액정을 이용한 Fringe-Field Driven 수평 배향셀의 위상지연값 연구

Study on Retardation Value of Fringe-Field Driven Homogeneously Aligned Nematic Liquid Crystal Cell using Liquid Crystals with Positive Dielectric Anisotropy

  • 발행 : 2004.03.01

초록

We have studied the optimal phase retardation value of a homogeneously aligned liquid crystal (LC) driven by fringe-field when using the LC with positive dielectric anisotropy. In general, the transmittance of a homogeneous aligned LC cell under crossed polarizer is maximum when a twist angle of LC by in-plane rotation is 45$^{\circ}$ with polarizer and the cell retardation becomes λ/2. However, the device using the LC with positive dielectric anisotropy does not follow this since the degree of rotation of the LC is dependent on electrode position and in addition the LCs tilt up along the fringe-field. At the center of common and pixel electrode, the LC is most twisted around a middle position of a cell whereas at the edge position of pixel electrode, the LC is most twisted near bottom surface of a cell. Consequently, the optimal phase retardation of the device becomes much larger than λ/2 and the transmittance can be described using the combination of the in-plane switching and twisted nematic mode.

키워드

참고문헌

  1. 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
  2. SID'95 Digest No-rub multi-domain method N.Koma;Y.Baba;K.Matsuoka
  3. Jpn. J. Appl. Phys. v.36 no.11 Quantitative analysis of cell gap margin for uniform optical properties M.Oh-E;K.Kondo https://doi.org/10.1143/JJAP.36.6798
  4. Jpn. J. Appl. Phys v.40 no.1 Electroptical study of an in-plane switching mode using a uniaxial medium model T.Satake;T.Nishioka;T.Saito;T.Kurata https://doi.org/10.1143/JJAP.40.195
  5. IDW'99 A high quality AM-LCD using fringe-field switching technology S.H.Lee;H.Y.Kim;S.L.Lee
  6. 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 https://doi.org/10.1143/JJAP.39.L527
  7. SID'01 digest paper Ultra-FFS TFT-LCD with super image quality and fast response time S.H.Lee;S.M.Lee;H.Y.Kim;J.M.Kim;S.H.Hong;Y.H.Jeong;C.H.Park;Y.J.Choi;J.Y.Lee;J.W.Koh;H.S.Park
  8. 전기전자재료학회논문지 v.15 no.1 유전율 이방성이 음인 액정을 이용한 이중 도메인 FFS 모드의 전기광학 특성 김향율;고재완;노정동;서대식;이승희
  9. 전기전자재료학회논문지 v.16 no.2 1매의 편광판으로 구성된 반사형 Fringe-Field Switching Mode의 전기 광학 특성 정태봉;박지혁;이종문;김용배;이승희
  10. 전기전자재료학회논문지 v.16 no.3 Fringe-Field Switching (FFS) 모드에서 액정의 유전율 이방성에 따른 동력학 안정성에 관한 연구 김미숙;김향율;이승희
  11. Appl. Phys. Lett. v.57 Extended Jones matrix representation for twisted namatic liquid crystal display at oblique incidence A.Lien https://doi.org/10.1063/1.103781