Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지
DOI QR코드

DOI QR Code

Study on Improving Viewing Angle of Homogeneous Aligned Liquid Crystal Display using an Compensation Film

보상필름을 이용한 수평 배향된 액정 디스플레이의 시야각 향상에 관한 연구

  • 임영진 (전북대학교 고분자.나노공학과) ;
  • 김성수 (전북대학교 고분자.나노공학과) ;
  • 진미형 (전북대학교 고분자.나노공학과) ;
  • 전은정 (전북대학교 고분자.나노공학과) ;
  • 최유진 (전북대학교 고분자.나노공학과) ;
  • 이승희 (전북대학교 고분자.나노공학과)
  • Published : 2008.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

We have studied electro-optic characteristics to improve viewing angle of the in-plain switching (IPS) liquid crystal display using an compensation film. The IPS mode shows relatively large light leakage and color shift in diagonal directions in a dark state. To solve this problem, we have compensated the low contrast ratio in diagonal directions using one optimized discotic film and adjusting TAC films of polarizers. The compensated IPS mode shows wide viewing angle characteristics that region of CR 50:1 is over $60^{\circ}$ of polar angle in all directions. The optimized IPS cell exhibits much better performances than other methods do in terms of CR and color uniformity.

Keywords

References

  1. M. Oh-e and K. Kondo, "Quantitative analysis of cell gap margin for uniform optical properties using in-plane switching of liquid crystals", Jpn. J. Appl. Phys., Vol. 36, No. 11, p. 6798, 1997 https://doi.org/10.1143/JJAP.36.6798
  2. Y. Sun, Z. Zhang, H. Ma, X. Zhu, and S.- T. Wu, "Optimal rubbing angle for reflective in-plane-switching liquid crystal displays", Appl. Phys. Lett., Vol. 81, No. 26, p. 4907, 2002 https://doi.org/10.1063/1.1532534
  3. S. H. Lee, S. L. Lee, and H. Y. Kim., "Electro-optic characteristics and switching principle of a nematic liquid crystal cell controlled by fringe-field switching", Appl. Phys. Lett., Vol. 73, No. 20, p. 2881, 1998 https://doi.org/10.1063/1.122617
  4. S. H. Hong, I. C. Park, H. Y. Kim, and S. H. Lee, "Electro-optic characteristic of fringe-field switching mode depending on rubbing direction", Jpn. J. Appl. Phys., Vol. 39, No. 6A, p. L527, 2000 https://doi.org/10.1143/JJAP.39.L527
  5. 정태봉, 임영진, 안명환, 이승희, "유전율 이방성이 양인 액정을 이용한 프린지 필드 구동형 모드에서 프리틸트각 변화에 따른 전기-광학특성", 전기전자재료학회논문지, 17권, 3호, p. 311, 2004
  6. S.-I. Jun, W.-Y. Park, I.-G. Kim, J.-Y. Lee, and J.-H. Souk, "Panel Transmittance Analysis of PVA Mode and a Noble Pixel Design", SID'02 Digest, p. 208, 2002
  7. S. G. Kim, S. M. Kin, Y. S. Kim, H. K. Lee, S. H. Lee, and G.-D. Lee, "Stabilization of the liquid crystal director in the patterned vertical alignment mode through formation of pretilt angle by reactive mesogen", Appl. Phys. Lett., Vol. 90, No. 26, p. 261910, 2007 https://doi.org/10.1063/1.2752105
  8. N. Koma, T. Miyashita, T. Uchida, and N. Mitani, "Dynamic Behavior of OCB-cell with Fast Response for a Color Sequential Liquid Crystal Display", SID'00 Digest, p. 632, 2000
  9. D. Kajita, I. Hiyama, Y. Utsumi, M. Ishii, and K. One, "Optically Compensated IPS- LCD for TV Applications", SID'05 Digest, p. 1160, 2005
  10. J. Chen, K.-H. Kim, J.-J. Jyu, J. H. Souk, J. R. Kelly, and P. J. Bos, "Optimum Film Compensation Modes for TN and VA LCDs", SID'98, Digest, p. 315, 1998
  11. Y. Saitoh, S. Kimura, K. Kusafuka, and H. Shimizu, "Optically Compensated In-Plane- Switching-Mode TFT-LCD Panel", SID'98 Digest, p. 706, 1998
  12. J.-H. Lee, J.-H. Kim, C.-S. Lim, S.-O. Mun, C.-H. Oh, J. C. Kim, and G.-D. Lee, "Optical Configurations of TW-IPS LC Cell for Very Wide Viewing Angle in Large Size TV Application", SID'05 Digest, p. 642, 2005
  13. A. Lien, "Extended Jones matrix representation for twisted nematic liquid-crystal display at oblique incidence", Appl. Phys. Lett., Vol. 57, No. 26, p. 2767, 1990 https://doi.org/10.1063/1.103781
  14. S. Aratani, H. Klausmann, M. oh-e, M. Ohta, K. Ashizawa, K. Yanagawa, and K. Kondo, "Complete suppression of color shift in in-plane switching mode liquid crystal displays with a multidomain structure obtained by unidirectional rubbing", Jpn. J. Appl. Phys., Vol. 36, No. 1A/B, p. L27, 1997 https://doi.org/10.1143/JJAP.36.L27