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Electro-optic Characteristics of the Fringe-Field Switching Liquid Crystal Mode, Status of Applications, and Future Issues (Invited Paper)

Fringe-Field Switching (FFS) 액정 소자의 전기광학 특성, 응용 현황 및 향후 이슈

  • Lim, Young Jin (Applied Materials Institute for BIN Convergence, Department of BIN Fusion Technology and Department of Polymer-Nano Science and Technology, Chonbuk National University) ;
  • Kim, Dae Hyung (Applied Materials Institute for BIN Convergence, Department of BIN Fusion Technology and Department of Polymer-Nano Science and Technology, Chonbuk National University) ;
  • Kim, Jin-Hyun (Applied Materials Institute for BIN Convergence, Department of BIN Fusion Technology and Department of Polymer-Nano Science and Technology, Chonbuk National University) ;
  • Kim, Yong Hae (Nature-mimic I/O Interface Research Section, ETRI) ;
  • Ahn, Seon Hong (Samsung Display Co. Ltd.) ;
  • Lee, Seung Hee (Applied Materials Institute for BIN Convergence, Department of BIN Fusion Technology and Department of Polymer-Nano Science and Technology, Chonbuk National University)
  • 임영진 (전북대학교 BIN융합공학과 및 고분자나노공학과, 미래형BIN융합응용소재사업단) ;
  • 김대형 (전북대학교 BIN융합공학과 및 고분자나노공학과, 미래형BIN융합응용소재사업단) ;
  • 김진현 (전북대학교 BIN융합공학과 및 고분자나노공학과, 미래형BIN융합응용소재사업단) ;
  • 김용해 (한국전자통신연구원 자연모사 I/O 인터페이스 연구실) ;
  • 안선홍 (삼성디스플레이 OLED 개발실) ;
  • 이승희 (전북대학교 BIN융합공학과 및 고분자나노공학과, 미래형BIN융합응용소재사업단)
  • Received : 2014.11.12
  • Accepted : 2014.12.04
  • Published : 2014.12.25

Abstract

Recently, the fringe-field switching (FFS) mode in liquid crystal displays has been used mainly for high image quality and high-resolution liquid crystal displays (LCDs). In this review paper, the fundamental switching principle of the FFS mode, with its excellence over other LC modes in electro-optic performance, will be described. In addition, the development history, present technical issues, and future of the FFS LCD will be discussed.

현재 Fringe-field switching(FFS) 액정 모드는 고화질 및 고정세 액정 디스플레이에 주로 적용되고 있다. 본 총설에서는 FFS모드의 어떠한 동작원리가 기존에 다른 액정모드 보다 왜 우수한 전기광학 특성을 갖는지에 대한 상세 한 설명과 더불어 FFS모드의 역사적 발전 현황, 기술의 현 주 이슈 및 향후 발전방향을 기술한다.

Keywords

References

  1. M. Schadt and W. Helfrich, "Voltage-dependent optical activity of a twisted nematic liquid crystal," Appl. Phys. Lett. 18, 127-129 (1971). https://doi.org/10.1063/1.1653593
  2. S. H. Lee, S. S. Bhattacharyya, H. S. Jin, and K. U. Jeong, "Devices and materials for high performance mobile liquid crystal displays," J. Mater. Chem. 22, 11893-11903 (2012). https://doi.org/10.1039/c2jm30635b
  3. H. S. Kwok, S. Naemura, and H. L. Ong, "Progress in liquid crystal science and technology: In honor of Shunsuke Kobayashi's 80th birthday," Series on Liquid Crystal 4 (World Scientific Pub Co. Inc., Washington, D.C., 2013).
  4. S.-T. Wu and D.-K. Yang, "Reflective liquid crystal display," Series in Display Technology (John Wiley and Sons, 2001), Chapter 4.
  5. R. Kiefer, B. Weber, F. Windscheid, and G. Baur, "In-plane switching of nematic liquid crystals," in Proc. The 12th International Display Research Conference and Japan Displays'92 (1992), pp. 547-550.
  6. M. Oh-e, M. Ohta, S. Aratani, and K. Kondo, "Principles and characteristics of electro-optical behavior with in-plane switching mode," in Proc. of the 15th International Display Research Conference and Asia Display (Society for Information Display, Hamamatsu, Japan, 1995), pp. 577-580.
  7. M. Oh-e and K. Kondo, "Electro-optical characteristics and switching behavior of the in-plane switching mode," Appl. Phys. Lett. 67, 3895-3897 (1995). https://doi.org/10.1063/1.115309
  8. N. Koma, Y. Yaba, and K. Matsuoka, "No-rub multi-domain TFT-LCD using surrounding-electrode method," SID Symp. Digest Tech. Pap. 26, 869-872 (1995).
  9. Y. Koike, S. Kataoka, T. Sasaki, H. Tsuda, A. Takeda, and K. Ohmuro, "A vertical aligned LCD providing super-high image quality," in Proc. of the 4th International Display Workshops (Society for Information Display, Nagoya, Japan, 1997), pp. 159-162.
  10. S. H. Lee, S. L. Lee, and H. Y. Kim, "Wide-viewing-angle nematic liquid crystal display controlled by fringe-field switching," in Proc. The 18th International Display Research Conference and Asia Display (Society for Information Display, Seoul, Korea, Sep 28-Oct 1, 1998), pp. 371-374.
  11. 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. 73, 2881-2883 (1998). https://doi.org/10.1063/1.122617
  12. S. H. Lee, S. L. Lee, H. Y. Kim, and T. Y. Eom, "A novel wide-viewing-angle technology: Ultra-trans view™," SID Symp. Digest Tech. Pap. 30, 202-205 (1999).
  13. S. H. Lee, S. M. Lee, H. Y. Kim, J. M. Kim, S. H. Hong, J. H. Jeong, C. H. Park, Y. J. Choi, J. Y. Lee, J. W. Koh, and H. S. Park, "18.1" ultra-FFS TFT-LCD with super image quality and fast response time," SID Symp. Dig. Tech. Pap. 32, 484-487 (2001).
  14. S. H. Lee, H. Y. Kim, S. M. Lee, S. H. Hong, J. M. Kim, J. W. Koh, J. Y. Lee, and H. S. Park, "Ultra-FFS TFT-LCD with super image quality, fast response time and strong pressure-resistant characteristics," J. Soc. Inf. Display 10/2, 117-122 (2002). https://doi.org/10.1889/1.1827852
  15. S. H. Lee, S. S. Bhattacharyya, H. S. Jin, and K. U. Jeong, "Devices and materials for high-performance mobile liquid crystal displays," J. Mater. Chem. 22, 11893-11903 (2012). https://doi.org/10.1039/c2jm30635b
  16. D. H. Kim, Y. J. Lim, D. E. Kim, S. H. Ahn, and S. H. Lee, "Past, present, and future of fringe-field switching-liquid crystal display," J. Inf. Disp. 15, 99-106 (2014). https://doi.org/10.1080/15980316.2014.914982
  17. T. Satake, T. Nishioka, T. Saito, and T. Kurata, "Electrooptical study of an in-plane switching mode using a uniaxial medium model," Jpn. J. Appl. Phys. 40, 195-199 (2001). https://doi.org/10.1143/JJAP.40.195
  18. I. H. Yu, I. S. Song, J. Y. Lee, and S. H. Lee, "Intensifying the density of horizontal electric field to improve light efficiency in a fringe - field switching liquid crystal display," J. Phys. D: Appl. Phys. 39, 2367-2372 (2006). https://doi.org/10.1088/0022-3727/39/11/009
  19. H. Y. Kim, S. H. Hong, J. M. Rhee, and S. H. Lee, "Analysis of cell gap-dependent driving voltage in a fringe field-driven homogeneously aligned nematic liquid crystal display," Liq. Cryst. 30, 1285-1292 (2003). https://doi.org/10.1080/02678290310001605893
  20. S. J. Kim, H. Y. Kim, S. H. Lee, Y. K. Lee, K. C. Park, and J. Jang, "Cell gap-dependent transmittance characteristic in a fringe field-driven homogeneously aligned liquid crystal cell with positive dielectric anisotropy," Jpn. J. Appl. Phys. 44, 6581-6586 (2005). https://doi.org/10.1143/JJAP.44.6581
  21. S. H. Lee, "Fundamentals of FFS/IPS mode and its application," Display Week, Society for Information Display, Seminars, M4 (2013).
  22. S. H. Jung, H. Y. Kim, J.-H. Kim, S.-H. Nam, and S. H. Lee, "Analysis of optimal phase retardation of a fringe field-driven homogeneously aligned nematic liquid crystal cell," Jpn. J. Appl. Phys. 43, 1028-1031 (2004). https://doi.org/10.1143/JJAP.43.1028
  23. D. H. Kim, I. W. Jang, Y. J. Lim, I. S. Yoo, G. H. Kim, Y. H. Kim, and S. H, Lee, "Studies on electro-optic characteristics of fringe field switching (FFS) mode depending on sign of dielectric anisotropy," J. Kor. Soc. Imag. Sci. Tech. 20, 1-11 (2014). https://doi.org/10.14226/KSIST.2014.20.1.01
  24. J. W. Ryu, J. Y. Lee, H. Y. Kim, J. W. Park, G. D. Lee, and S. H. Lee, "Effect of magnitude of dielectric anisotropy of a liquid crystal on light efficiency in the fringe-field switching nematic liquid crystal cell," Liq. Cryst. 35, 407-411 (2008). https://doi.org/10.1080/02678290801919659
  25. J. H. Jung, K. S. Ha, A. K. Srivastava, H. K. Lee, S. E. Lee, and S. H. Lee, "Light efficiency of the dependence of fringe-field switching mode on the of the dielectric anisotropy of liquid crystal for various values of the cell gap and the rubbing angle," J. Korean Phys. Soc. 56, 548-553 (2010). https://doi.org/10.3938/jkps.56.548
  26. S. W. Kang, I. W. Jang, D. H. Kim, Y. J. Lim, and S. H. Lee, "Enhancing transmittance of fringe-field switching liquid crystal device by controlling perpendicular component of dielectric constant of liquid crystal," Jpn. J. Appl. Phys. 53, 010304 (2014). https://doi.org/10.7567/JJAP.53.010304
  27. 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. 39, L527-L530 (2000). https://doi.org/10.1143/JJAP.39.L527
  28. S. H. Jung, H. Y. Kim, M. H. Lee, J. M. Rhee, and S. H. Lee, "Cell gap-dependent transmission characteristics of a fringe-electric field driven homogeneously aligned liquid crystal cell for a liquid crystal with negative dielectric anisotropy," Liq. Cryst. 32, 267-275 (2005). https://doi.org/10.1080/02678290412331329233
  29. S. J. Kim, H. Y. Kim, S. H. Lee, Y. K. Lee, K. C. Park, and J. Jang, "Cell gap-dependent transmittance characteristic in a fringe field-driven homogeneously aligned liquid crystal cell with positive dielectric anisotropy," Jpn. J. Appl. Phys. 44, 6581-6586 (2005). https://doi.org/10.1143/JJAP.44.6581
  30. S. H. Lee, S. L. Lee, H. Y. Kim, and T. Y. Eom, "Analysis of light efficiency in homogeneously aligned nematic liquid crystal display with interdigital electrodes," J. Korean Phys. Soc. 35, S1111-S1114 (1999).
  31. H. J. Yun, M. H. Jo, I. W. Jang, S. H. Lee, S. H. Ahn, and H. J. Hur, "Achieving high light efficiency and fast response time in fringe field switching mode using a liquid crystal with negative dielectric anisotropy," Liq. Cryst. 39, 1141-1148 (2012). https://doi.org/10.1080/02678292.2012.700078
  32. T. Tsukada, TFT/LCD Liquid-Crystal Displays Adddressed by Thin-Film Transistors (CRC Press, London, 1996).
  33. K. H. Lee, H. Y. Kim, S. H. Song, K. H. Kim, Y. C. Chung, S. J. Jang, C. H. Kim, S. K. Lee, and Y. J. Lim, "Super-high performance of 12.1-in. XGA tablet PC and 15-in. UXGA panel with advanced pixel concept," SID Symp. Digest Tech. Pap. 35, 1102-1105 (2004).
  34. K. Ono, I. Mori, Y. Tomioka, and Y. Satou, "High performance IPS technology for LCD-TVs:AS-IPS2," in Proc. The 11th International Display Workshops (Society for Information Display, Niigata, Japan, Dec. 8-10, 2004), pp. 295-298.
  35. K. Kondo, "Recent advancements and future possibilities of IPS-TFT-LCDs," SID Symp. Digest Tech. Pap. 36, 978-981 (2005).
  36. D. H. Lim, H. Y. Lee, J. P. Kim, K. J. Lee, H. J. Yun, K. Y. Han, and H. Jeong, "High performance mobile application with the high aperture ratio FFS (HFFS) technology," in Proc. The 13th International Display Workshops (Society for Information Display, Takamatsu, Japan, Dec. 6, 2006), pp. 807-808.
  37. K. Ono and I. Hiyama, "The latest IPS pixel structure suitable for high resolution LCDs," in Proc. The 19th International Display Workshops in Conjunction with Asia Display (Society for Information Display, Kyoto, Japan, Dec. 4-7, 2012), pp. 933-936.
  38. K. Ono and H. Matsukawa, "High performance IPS technology suitable for high resolution LCDs," in Proc. The 20th International Display Workshops (Society for Information Display, Sapporo, Japan, Dec. 4-6, 2013), pp. 24-25.
  39. Y. Liao, X. Shao, Y. Du, Y. Song, W. Hu, Z. Zhang, Y. Chen, Y. Wang, Q. Ma, D. Yoon, D. Wang, J. Yuan, H. Wu, Z. Guo, Z. Hao, J. Zhang, and J, Lv, "Development of a 120Hz 110inch ultra definition a-Si TFT LCD TV panel," in Proc. The 13th International Meeting on Information Display (Society for Information Display, Daegu, Korea, Aug. 26-29, 2013), pp. 8-11.
  40. D. Wang, "Trends in mainland China's display industry and BOE's role," Display Week, Society for Information Display, Keynote 1 (2014).
  41. H. J. Ahn, C. Lim, D. Kim, J. Lee, H. Park, S. Lee, J. Woo, W. Shin, and M. Jun, "UV aligned IPS-LCD for high resolution smart displays," SID Symp. Digest Tech. Pap. 43, 1432-1435 (2012).
  42. H. Matsukawa, Y. Shimano, M. Suefuji, Y. Umeda, and K. Mimura, "The World's first photo-aligned IPS-LCDs for a TV use," in Proc. The 19th International Display Workshops in Conjunction with Asia Display (Society for Information Display, Kyoto, Japan, Dec. 4-7, 2012), pp. 1581-1584.
  43. T. Tsuruma, Y. Goto, A. Higashi, M. Watanabe, H. Yamaguchi, and T. Tomooka, "Novel image sticking model in the fringe field switching mode based on the flexoelectric effect," in Proc. The 31st International Display Research Conference and Eurodisplay Display (Society for Information Display, Arcachon, France, Sep. 19-22, 2011), pp. 15-18.
  44. I. H. Jeong, I. W. Jang, D. H. Kim, J. S. Han, B. V. Kumar, S, H. Lee, S. H. Ahn, S. H. Cho, and C. Yi, "Investigation on flexoelectric effect in the fringe field switching mode," SID Symp. Digest Tech. Pap. 44, 1368-1371 (2013).
  45. S. H. Lee, "Fundamentals of FFS and IPS mode LCDs," Display Week, Society for Information Display, Seminars, M11 (2014).