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A Study on Electro-optical Characteristics of the Ion Beam Aligned FFS Cell on a Inorganic Thin Film

무기 박막을 이용한 이온빔 배향 FFS 셀의 전기광학특성에 관한 연구

  • Published : 2004.10.01

Abstract

In this paper, we intend to make fringe-field switching (FFS) mode cell by the ion beam (IB) alignment method on the a-C:H thin film, to analyze electro-optical characteristics in this cell. We studied on the suitable inorganic thin film for fringe-field switching (FFS) cell and the aligning capabilities of nematic liquid crystal (NLC) using the alignment material of a-C:H thin film as working gas at 30 W rf bias condition. A high pretilt angle of about 5 $^{\circ}C$ by ion beam (IB) exposure on the a-C:H thin film surface was measured. Consequently, the high pretilt angle and the good thermal stability of LC alignment by the IB alignment method on the a-C:H thin film surface as working gas at 30 W rf bias condition can be achieved. An excellent voltage-transmittance (V -T) and response time curve of the IE-aligned FFS-LCD was observed with oblique IB exposure on the a-C:H thin films. Also, AC V-T hysteresis characteristics of the IB-aligned FFS-LCD with IE exposure on the a-C:H thin films is almost the same as that of the rubbing-aligned FFS cell on a polyimide (PI) surface.

References

  1. D.-S. Seo, K. Muroi, and S. Kobayashi, 'Generation of pretilt angle in nematic liquid crystal, 5CB, media aligned polyimide films prepared by spin -coating and LB techniques : effect of rubbing', Mol. Cryst. Liq. Cryst., Vol. 213, p. 223, 1992 https://doi.org/10.1080/10587259208028733
  2. D.-S. Seo, N. Yoshida, S. Kobayashi, M. Nishikawa, and Y. Yabe, 'Effects of conjugation of rnesogenic core of nematic liquid crystals for polar anchoring energy and surface order parameter on rubbed polyirnide films', Jpn. J. Appl. Phys., Vol. 33, No. 8B, p. L1174, 1994 https://doi.org/10.1143/JJAP.33.L1174
  3. K. Ichimura, Y. Akita, H. Akiyama, K. Kudo, and Y. Hayashi 'Photoreactivity of polymers with regioisomeric cinnamate side chains and their ability to regulate liquid crystal alignment' Macromolecules, Vol. 30, p. 903, 1997 https://doi.org/10.1021/ma961225q
  4. M. Nishikawa, B. Taheri, and J. L. West, 'Polyimide films designed to produce high pretilt angles with a single linearly polarized UV exposure', SID '98, p. 131, 1998
  5. 황정연, 서대식, 서동학, 김향율, '광중합된 PM4Ch 표면을 이용한 액정 배향 효과', 전기전자재료학회논문지, Vol. 12, No. 10, p. 926, 1999
  6. 황정연, 서대식, 김재형, 한은주, '광중합법을 이용한 네마틱액정의 배향안전성 및 프리틸트각의 발생', 전기전자재료학회논문지, Vol. 14, No. 4, p. 336, 2001
  7. 황정연, 이윤건, 서대식, 김준영, 김태호, '3가지 종류의 치환기를 함유한 N-(phenyl) maleimide계 광폴리머 표면을 이용한 액정 배향효과에 관한 연구', 전기전자재료학회논문지, Vol. 15, No. 3, p. 264, 2002
  8. P. Chaudhari, J. Lacey, J. Doyle, E. Galligan, S. C. Alan, A. Callegari, G. Hougham, N. D. Lang, P. S. Andry, R. John, K. H. Yang, M. Lu, C. Cal, J. Speidell, S. Purushothaman, J. Ritsko, M. Samnt, J. Stohrt, Y. Nakagawa, Y. Katoh, Y. Saitoh, K. Saka, H. Satoh, S. Odahara, H. Nakano, J. Nskshski, and Y. Shiota, 'Atomic-beam alignment of material for liquid-crystal displays' Nature, Vol. 411, p. 56, 2001 https://doi.org/10.1038/35075021
  9. T. Toyooka, E. Yoda, Y. Kobori, T. Yamanashi, and H. Itoh, 'Optical design for wide-viewing-angle TN-LCD with hybrid aligned nematic compensation flims', SID 98 digest, p. 698, 1998
  10. 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. 71, No. 20, p. 2881, 1998