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The basic study on improved performance of transflective liquid crystal displays

Research Project

Project/Area Number 17560321
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionKanazawa Institute of Technology

Principal Investigator

FUKUDA Ichiro  Kanazawa Institute of Technology, College of Engineering, Professor, 工学部, 教授 (10064445)

Co-Investigator(Kenkyū-buntansha) SAKAMOTO Yasutada  Kanazawa Institute of Technology, College of Engineering, Professor, 工学部, 教授 (50148152)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsLCD / Transflective / Homogeneous-mode / Retardation film / Achromatic-LCD / Low power consumption / Wide viewing angle
Research Abstract

High-quality color liquid-crystal displays (LCDs) that are light weight and low in power consumption are important devices in highly functional information terminals. Transflective LCDs are the general preference for mobile applications because the combination of backlighting and reflection of ambient light creates high visibility under any intensity of ambient illumination. Low power consumption without recharging the battery is a key requirement for extended use of mobile devices. Therefore, it is advantageous to reduce the TFT-LCD's power consumption in the panel while maintaining its superior image quality.
To confirm the possibility of reducing power consumption of a transflective homogeneous-cell with two retardation films, we numerically analyzed the relationship between device parameters, including the birefringence dispersion of the retardation film, Δn_R(λ), and the electro-optical properties of the LCD.
We found that the optimized LCD produces an achromatic high-quality image with wide viewing angles, even when the on-voltage is reduced to 2.0V. The power consumption in the panel can thus be decreased to about one-fourth that of a current transflective TFT-LCD operating at 4.0V in the on-state. In addition, we studied the feasibility of enhancing the performance of the LCD using previous calculations. We further reduced the power consumption of the LCD by raising the off-state voltage from 0V to 0.5V, which did not affect the display characteristics. We also realized considerable improvement in the optical properties of the viewing angle by incorporating a two-domain structure. In addition, we found that we could easily produce the LCD using present technology. We confirmed by calculation that the electro-optical properties of the LCD were not affected, even if the cell-gap changed to ±2% from the designed value.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (10 results)

All 2006 2005

All Journal Article (10 results)

  • [Journal Article] Improved Performance of Homogeneous-Mode Transflective LCDs with Low Driving Voltage and Wide Viewing Angles2006

    • Author(s)
      Y.Sakurai
    • Journal Title

      Proceedings of The 13^<th> International Display Workshops

      Pages: 185-188

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Optimization of Viewing-Angle Optical Properties in an OCB-LCD Compensated with Hybrid-Aligned Discotic Liquid-Crystal Films and C-plates2006

    • Author(s)
      I.Fukuda
    • Journal Title

      Proceedings of The 13^<th> International Display Workshops

      Pages: 133-136

    • NAID

      10018500016

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Improved Performance of Homogeneous-Mode Transflective LCDs with Low Driving Voltage and Wide Viewing Angles2006

    • Author(s)
      Y.Sakurai, T.Onishi, Y.Sakamoto, I.Fukuda
    • Journal Title

      Proc. of the 13^<th> International Display Workshops

      Pages: 185-188

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Optimization of Viewing-Angle Optical Properties in an OCB-LCD Compensated with Hybrid-Aligned Discotic Liquid-Crystal Films and C-plates2006

    • Author(s)
      I.Fukuda, T.Nakata, Y.Sakamoto, T.Ishinabe, T.Uchida
    • Journal Title

      Proc. of the 13^<th> International Display Workshops

      Pages: 133-136

    • NAID

      10018500016

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Improved Performance of Homogeneous-Mode Transflective LCDs with Low Driving Voltage and Wide Viewing Angels2006

    • Author(s)
      Y.Sakurai
    • Journal Title

      Proceedings of The 13^th International Display Workshops

      Pages: 185-188

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Optimization of Viewing-Angle Optical Properties in an OCB-LCD Compensated with Hybrid-Aligned Discotic Liquid-Crystal Films and C-plates2006

    • Author(s)
      I.Fukuda
    • Journal Title

      Proceedings of The 13^th International Display Workshops

      Pages: 133-136

    • NAID

      10018500016

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Transflective LCD with Wide Viewing Angle and Low Driving Voltage2005

    • Author(s)
      I.Fukuda
    • Journal Title

      Proceedings of The 12^<th> International Display Workshops in conjunction with Asia Display 2005

      Pages: 107-110

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Effects of Various Parameters of Discotic Compensation Films on Viewing Angle Properties in OCB-LCD2005

    • Author(s)
      I.Fukuda
    • Journal Title

      Proceedings of The 12^<th> International Display Workshops in conjunction with Asia Display 2005

      Pages: 185-188

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Transflective LCD with Wide Viewing Angle and Low Driving Voltage2005

    • Author(s)
      I.Fukuda, Y.Sakurai, N.Nakata, Y.Sakamoto
    • Journal Title

      Proc. of the 12^<th> International Display Workshops

      Pages: 107-110

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of Various Parameters of Discotic Compensation Films on Viewing Angle Properties in OCB-LCD2005

    • Author(s)
      I.Fukuda, N.Nakata Y.Sakurai, Y.Sakamoto
    • Journal Title

      Proc. of the 12^<th> International Display Workshops

      Pages: 185-188

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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