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Fundamental Study of Ferroelectric Liquid Crystals for their Practical Use in Fast Displays

Research Project

Project/Area Number 60460067
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理計測・光学
Research InstitutionTokyo Institute of Technology

Principal Investigator

FUKUDA Atsuo  Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (10013484)

Co-Investigator(Kenkyū-buntansha) TAKEZOE Hideo  Tokyo Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10108194)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1986: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1985: ¥5,800,000 (Direct Cost: ¥5,800,000)
KeywordsFerroelectric liquid crystals / Fast displays / 表面安定化状態
Research Abstract

The structure of SSFLC states and the switching processes among them have been studied. Observation of the switching processes using stroboscopic micrographs was very useful for clarifying the structure. In most cases where Sm A exists as a high temperature phase, directors in the upper half of a cell and those in the lower half rotate on a cone in the opposite sense; hence the director in the middle which cannot move continuously because of the symmetry requirement make a sudden jump, forming a disclination loop. Occurrence of the switching process characterized by the internal disclination formation inevitably requires selective pretilting of the C-directors at the bounding surfaces. The simpler switching process originally proposed by Clark and Lagerwall, where all directors move in the same sense, is rather exceptional, though sometimes occurs.
Taking account of the high resolution X ray diffraction study by Clark et al., the real cause of the C-director selective pretilting must be the bending or kinking of the smectic layers. There are two ways in which the layers kink, i.e. <<< and >>>. Zigzag defect lines so far considered by us as dislocations decorated by disclinations are now identified as the misarrangement of the layer kinks, such as <<<*>>>*<<<. This identification successfully explains the characteristic features played by the zigzag lines during the switching processes.
Polarized transmittance spectra of the SSFLC states have been obtained by combining a spectrometer with a polarizing microscope. Based on the layer bending or the C-director selective pretilting, we can nearly reproduce the spectra using the 4 x 4 matrix method. Experiments concerning the tilt angle described in the research proposal has not been performed, but instead a noble method has been proposed for measuring the viscosity constants. Preliminary studies have also been done in a case where Sm A does not exist as a high temperature phase.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] T.Tsuchiya;H.Takezoe;A.Fukuda: Jpn.J.Appl.Phys.25-1. L27-L29 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Shingu;T.Tsuchiya;Y.Ouchi;H.Takezoe;A.Fukuda: Jpn.J.Appl.Phys.25-3. L206-L208 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H.Takezoe;Y.Ouchi;K.Ishikawa;A.Fukuda: Mol.Cryst.& Liq.Cryst.139. 27-46 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Hatano;K.Yamamoto;H.Takezoe;A.Fukuda: Jpn.J.Appl.Phys.25-12. 1762-1767 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Ouchi;H.Takezoe;A.Fukuda: Jpn.J.Appl.Phys.26-1. 1-14 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Ouchi;H.Takano;H.Takezoe;A.Fukuda: Jpn.J.Appl.Phys.26-1. L21-L24 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Kimura;S.Nishiyama;Y.Ouchi;H.Takezoe;A.Fukuda: Jpn.J.Appl.Phys.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Ouchi;S.Kimura;T.Tsuchiya;H.Takezoe;A.Fukuda: 11th International Liquid Crystal Conference (June 30-July 4,1986,Berkeley,CA USA).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M.Kuwahara,T.Shingu,T.Tsuchiya,Y.Ouchi,H.Takezoe and A.Fukuda: 11th International Liquid Crystal Conference June 30-July 4,1986,Berkley.CA USA).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y.Ouchi,H.Takano,H.Takezoe and A.Fukuda: 7th Liquid Crystal Conference of Socialist Countries,August 31-September 4,1987,Pardubice,Czechoslovakia.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H.Takezoe,Y.Ouci and A.Fukuda: (7th Liquid Crystal Conference of Socialist Countries,August 31-September 4,1987,Pardubice,Czechoslovakia).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Kimura,S.Nishiyama,Y.Ouchi,H.Takezoe and A.Fukuda: 7th Liquid Crystal Conference of Socialist Countries,August 31-September 4,1987,Pardubice,Czechoslovakia.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Tsuchiya, H. Takezoe and A. Fukuda:"Importance of Controlling Material Constants to Realize Bistable Uniform States in Surface Stabilized Ferroelectric Liquid Crystal Cells" Jpn. J. Appl. Phys.25-1. L27-L29 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Shingu, T. Tsuchiya, Y. Ouchi, H. Takezoe and A. Fukuda: "Molecular Selective Pre-tilt on Glass Surfaces and Color Difference between Two Twisted States in Surface Stabilized Ferroelectric Liquid Crystal Cells" Jpn. J. Appl. Phys.25-3. L206-L208 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H. Takezoe, Y. Ouchi, K. Ishikawa and A. Fukuda: "Molecular Orientation Structure of Surface Stabilized States and their Switching Processes in Ferroelectric Liquid Crystals" Mol. Cryst. & Liq. Cryst.139. 27-46 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Hatano, K. Yamamoto, H. Takezoe and A. Fukuda: "Alignment Controls and Switching Characteristic in a Ferroelectric Liquid Crystal with the Phase Sequence of N*-SC*" Jpn. J. Appl. Phys.25-12. 1762-1767 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Ouchi, H. Takezoe and A. Fukuda: "Switching Process in Ferroelectric Liquid Crystals; Disclination Dynamics of the Sruface Stabilized States (Invited Paper)" Jpn. J. Appl. Phys.26-1. 1-14 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Ouchi, H. Takano, H. Takezoe and A. Fukuda: "Two Kinds of Switching Processes in Surface Stabilized Ferroelectric Liquid Crystals" Jpn. J. Appl. Phys.26-1. L21-L24 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Kimura, S. Nishiyama, Y. Ouchi, H. Takezoe and A. Fukuda: "Viscosity Measurement in Ferroelectric Liquid Crystals Using a Polarization Switching Current" Jpn. J. Appl. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Ouchi, S. Kimura, T. Tsuchiya, H. Takezoe and A. Fukuda: "Dynamical Behavior of Surface Stabilized Ferroelectric Liquid Crystals ( <theta> -028-FE)" 11th International Liquid Crystal Conference (June 30 - July 4, 1986, Berkeley, CA USA).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M. Kuwahara, T. Shingu, T. Tsuchiya, Y. Ouchi, H. Takezoe and A. Fukuda: "A. Model of Surface Stabilized States in Ferroelectric Liquid Crystal Cells" 11th International Liquid Crystal Conference (June 30 - July 4, 1986, Berkley. CA USA).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Y. Ouchi, H. Takano, H. Takezoe and A. Fukuda: "Two Kinds of Zig-Zag Lines and Interaction with Disclinations in Surface Stabilized Ferroelectric Liquid Crystal Cells" 7th Liquid Crystal Conference of Socialist Countries, August 31 - September 4, 1987, Pardubice, Czechoslovakia.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H. Takezoe, Y. Ouchi and A. Fukuda: "Switching Processes in Surface Stabilized Ferroelectric Liquid Crystals (Invited Paper)" 7th Liquid Crystal Conference of Socialist Countries, August 31 - September 4, 1987, Pardubice, Czechoslovakia.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S. Kimura, S. Nishiyama, Y. Ouchi, H. Takezoe and A. Fukuda: "Viscosity Measurement in Ferroelectric Liquid Crystals Using a Polarization Switching Current" 7th Liquid Crystal Conference of Socialist Countries, August 31 - September 4, 1987, Pardubice, Czechoslovakia.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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