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The basic study on new high picture quality reflective-type color liquid crystal display

Research Project

Project/Area Number 12650352
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 電子デバイス・機器工学
Research InstitutionKanazawa Institute of Technology

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) SAKAMOTO Yasutada  Kanazawa Institute of Technology, Engineering, Professor, 工学部, 教授 (50148152)
KOTANI Yukeo  Kanazawa Institute of Technology, Engineering, Professor, 工学部, 教授 (50170262)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsLCD / Reflective-type / TN-LCD / STN-LCD / Achromatic-LCD / Color-LCD / Retardation film / Quarter-wave plate / 位相差板 / 無彩色表示 / カラー表示 / DSTN-LCD
Research Abstract

High-quality, lightweight, reflective color LCDs with low power consumption are important devices for highly functional and portable information terminals. Though various reflective LCDs have been proposed, only reflective color LCDs using a single-polarizer TN-LCD and STN-LCD are presently being used in practical applications. However, the quality of the reflective LCDs must be improved. To achieve this, we proposed some new reflective LCDs like the following and numerically analyzed the electro-optical properties of the LCDs.
1. Single-polarizer DSTN-LCD and FDSTN-LCD with a quarter-wave plate
2. Single-polarizer DTN-LCD and FSTN-LCD with a quarter-wave plate
3. Single-polarizer MDTN-LCD with a retardation film
We found that the display mode (1) exhibits a high contrast ratio of infinity in theory and high luminous reflectance of 48 %, independent of the duty ratio, and display modes (2) and (3) exhibit a very high contrast ratio and a high luminous reflectance of 50 % through optimum deign of the device parameters. In addition, the consumption of the reflective color TN-LCD is several times larger than that of the reflective color STN-LCD. It is thus desirable to reduce the TN-LCD's power consumption while maintaining its high image quality. In order to confirm the possibility to reduce power consumption, we analyzed the relationship between the electro-optical properties of some new reflective LCDs like the following and the on-voltage of a TFT-LCD.
1. Single-polarizer DTN-LCD and FSTN-LCD with a quarter-wave plate
2. Single-polarizer DTN-LCD and FSTN-LCD with a retardation film
3. Single-polarizer TN-LCD with retardation film of the two sheets
We found that the LCDs exhibit an achromatic image of high luminous reflectance of about 50 % and a very high contrast ratio, even if the on- voltage is reduced to 2V. The power consumption can thus be decreased to about 1/6 to 1/7 that ofa current reflective 5V TFT-LCD in the on- state.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Ichiro Fukuda: "Electro-Optical Properties of a Single-Palariger Reflective DTN-LCD and FDTN-LCD with a Retardation Film"The 18th International iguial Crystal Conference Abstracts. 123 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ichiro Fukuda: "New-Reflective LCDs : Single-Palariger Double-Layed STN-LCD and Film STN-LCD with a Quarter-Wave Plate"Proceedongs of the Seventh International Pisplay Workshops. 325-328 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasutada Sakamoto: "A Photo Cathode Display reduced the number of TFT"Proceedongs of the Seventh International Pisplay Workshops. 561-564 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ichiro Fakuda: "New Reflective LCDs Using a Siagle-Polarizer Double-tayecl TN-LCD and Film TN-LCD with a Iuater-Wave Plate"Proceedings of the zith International Pisplay Researchcob in corianction with 8th International Pidplay Worlshops. 269-272 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yasutada Sakamoto: "A Three-dimentional Display Using Maltiple Liguid Cryatal Sureens"Proceedings of International Workshop on Advancel Image Technology. 57-59 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Fukuda,I., Nakane,N., Hazama,M., Kotani,Y., Uchida,M.: "ELECTRO-OPTICAL PROPERTIES OF A SINGLE-POLARIZER REFLECTIVE DTK-LCD AND FDTN-LCD WITH A RETARDATION FILM"The 18th International Liquid Crystal Conference )ILCC2000) Abstracts. 123 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Fukuda,I., Hazama,M., Koshida,Y., Nakane,N.: "New Reflective LCDs: Single-Polarizer, Double-Layered STN-LCD and Film STN-LCD with a Quarter-Wave Plate"Proceedings of The Seventh International Display Workshops )IDW' 00). 325-328 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Fukuda,I., Koshida,Y., Izoe,T., Sakamoto,Y.: "New Reflective LCDs usig a Single-Polarizer Double-Layered TN-LCD and Fihn TN-LCD with a Quarter-Wave Plate"Proceedings of Asia Display/International Display Workshops )IDW' 01). 269-272 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ichiro Fukuda: "New Reflective LCDs Using a Single-Polarizer Double-Layered TN-LCD and Film TN-LCD with a Quarter Wave Plate"Proceedings of the 21th International Display Research Conf. in conjunction with 8th International Display Workshops. 269-272 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yasutada Sakamoto: "A Three-dimentional Dislay Using Maltiple Liquid Crystal Screens"Proceedings of International Workshop on Advanced Image Technology. 57-59 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Ichiro Fukulla: "Electro-Optical Properties of a Single-Polerizer Reflective DTN-LCD and FDTN-LCD with a Retardation Film"The 18th International Liquid Crystal Conference Abstracts. 123 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ichiro Fukuda: "New Reflective LCDs : Single-Polarizer Duuble Layered STN-LCD and Film STN-LCD with a Quater-Wave Plate"Proceedings of The Seventh International Display Workshops. 325-328 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yasumasa Sakamoto: "A Photo Cathode Display reduced the number of TFT"Proceedings of The Seventh International Display Workshops. 561-564 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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