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Enhancement of Brightness and Contrast in Fluorescent Liquid Crystal Display Using Sensitizing Effect

Research Project

Project/Area Number 14550032
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionAkita University

Principal Investigator

YAMAGUCHI Rumiko  AKITA UNIVERSITY, Faculty of Engineering and Resource Science, Research Associate, 工学資源学部, 助手 (30170799)

Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsLiquid CRystal / Fluorescence / Emissive display / Guest host effect / Sensitizing effect / ネマティック液晶 / 蛍光 / 増感効果 / 表示素子 / 二色性
Research Abstract

Emissive liquid crystal display (LCD) in which a dichroic phosphor is dissolved as a guest material have been reported. Brightness and contrast of the LCDsare enhanced has been demonstrated by using sensitizing effect.
(1)The remarkable increase of the green fluorescence intensity from the coumarin-6 in the LC host can be obtained by adding the blue fluorescent dichroic dye or the fluorescent LC as a sensitizer. Applying the sensitization to the emissive type LCD of which color is switched from green to blue, the luminance of the green fluorescence and the color switching property are improved. The color switching between blue to red in the LCD assembled with the blue LED and the red fluorescent LC cell is also improved by adding the sensitizer. These results indicate that the light utilization of the excitation back light is also increased by using the sensitizing effect.
(2)The increase of the green and red fluorescence intensity of dichroic dyes in the LC host can be obtained by the sensitizing effect. Relations between absorption and emission dichroic ratios are measured in the fluorescent LC cell with and without the sensitizer. When the voltage is applied to the cell, the fluorescence intensity which is excited by the polarized UV light parallel to the LC direction decreases and becomes lower than that excited by the polarized UV light perpendicular to the LC direction. Moreover, it is clarified that both the brightness and the contrast can be enhanced, if the dichroic ratio of the sensitizer is higher than that of the emitter.
(3)Liquid crystal displays emitting white fluorescence are successfully demonstrated by mixing two or three fluorescent dyes in the homogeneous, TN and homeotropic alignment LC cell. The white fluorescence intensity changes by applying the voltage while the color maintains white. The steepness is improved by using TN orientation. The contrast ratio of 13.3 in the homeotropic alignment LC cell is the highest in three types of LC cell.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (21 results)

All 2005 2004 2003 2002 Other

All Journal Article (14 results) Publications (7 results)

  • [Journal Article] Sensitization effects of fluorescent dichroic dyes in a nematic liquid crystal and fluorescence colors2005

    • Author(s)
      R.Yamagushi, et al.
    • Journal Title

      Mol.Cryst.Liq.Cryst. (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sensitization effects of fluorescent dichroic dyes in a nematic liquid crystal and their fluorescent colors2005

    • Author(s)
      R.Yamaguchi et al.
    • Journal Title

      Mol.Cryst.Liq.Cryst. (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Sensitization effects of fluorescent dichroic dyes in a nematic liquid crystal and fluorescence colors2004

    • Author(s)
      R.Yamaguchi, et al.
    • Journal Title

      20th International Liquid Crystal Conference Book of Abstracts

      Pages: 208-208

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] White Fluorescent Display Properties in Liquid Crystal Cells Using Dichroic Dyes.2004

    • Author(s)
      R.Yamaguchi, et al.
    • Journal Title

      Proceedings of the 11th International Display Workshop IDW '04

      Pages: 113-116

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 蛍光液晶素子における偏光発光の電気光学特性2004

    • Author(s)
      山口留美子 他
    • Journal Title

      日本液晶学会討論会

      Pages: 405-406

    • NAID

      130005043611

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sensitized Fluorescence of Dichroic Dye in Emissive Type Liquid Crystal Displays2004

    • Author(s)
      R.Yamaguchi
    • Journal Title

      Mol.Cryst.Liq.Cryst. Vol.410

      Pages: 495-504

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sensitization effects of fluorescent dichroic dyes in nematic liquid crysta2004

    • Author(s)
      R.Yamaguchi
    • Journal Title

      Mol.Cryst.Liq.Cryst. Vol.422

      Pages: 105-114

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] White Fluorescent Display Properties in Liquid Crystal Cells Using Dichroic Dyes2004

    • Author(s)
      R.Yamaguchi
    • Journal Title

      Proceedings of the 11th International Display Workshop IDW '04

      Pages: 113-116

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sensitization effects of fluorescent dichroic dyes in a nematic liquid crystal and their fluorescent colors2004

    • Author(s)
      R.Yamaguchi et al.
    • Journal Title

      20th International Liquic Crystal Conference Book of abstracts

      Pages: 208-208

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 蛍光液晶素子における偏光発光の電気光学特性2004

    • Author(s)
      山口 留美子 他
    • Journal Title

      2004年日本液晶学会討論会講演予稿集

      Pages: 450-451

    • NAID

      130005043611

    • Related Report
      2004 Annual Research Report
  • [Journal Article] White Fluorescent Display Properties in Liquid Crystal Cells Using Dichroic Dyes2004

    • Author(s)
      R.Yamaguchi et al.
    • Journal Title

      Proceedings of the 11th International Display Workshops

      Pages: 113-116

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Sensitizing Effect and Dichroic Ratio of Fluorescent Nematic Liquid Crystals2003

    • Author(s)
      R.Yamaguchi
    • Journal Title

      Proceedings of the 10th International Display Workshop IDW '03

      Pages: 177-120

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Improvement of Fluorescent Liquid Crystal Displays by Sensitizing Effect2002

    • Author(s)
      R.Yamaguchi
    • Journal Title

      Proceedings of the 9th International Display Workshop IDW'02

      Pages: 173-176

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sensitization effects of fluorescent dichroic dyes in a nematic liquid crystal and fluorescence colors

    • Author(s)
      R.Yamaguchi
    • Journal Title

      Mol.Cryst.Liq.Cryst. (in printing)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Rumiko Yamaguchi et al.: "Sensitized Fluorescence of Dichroic Dye in Emissive Type Liquid Crystal Displays"Molecular Crystals and Liquid Crystals. (印刷中). (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 山口 留美子他: "ネマティック液晶中における2色性色素の蛍光増感効果"日本液晶学会討論会講演予稿集. 215-216 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Rumiko Yamaguchi et al.: "Improvement in Fluorescent Liquid Crystal Displays by Sensitization effect"Proceedings of the 9th International Display Workshops. 173-176 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Rumiko Yamaguchi et al.: "Sensitizing effect of fluorescent dichroic dye in nematic liquid crystal"Abstracts of 10th International Topical Meeting on Optics Liquid Crystals. 58 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Rumiko Yamaguchi: "Sensitized Fluorescence of Dichroic Dye in Emissive Type Liquid Crystal Displays"Molecular Crystals and Liquid Crystals. (印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 山口 留美子: "ネマティック液晶中における2色性色素の蛍光増感効果"日本液晶学会討論会 講演予稿集. 215-216 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Rumiko Yamaguchi: "Improvement in Fluorescent Liquid Crystal Displays by Sensitization effect"Proceedings of the 9th International Display Workshops. 173-176 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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