Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation

Yumi Mori, Ryoji Yoshitake, Tohru Tamura, Toru Yoshizawa, Satoshi Tsuji

研究成果: Conference article査読

17 被引用数 (Scopus)


Based on sensory analysis, quantitative evaluation method of the luminance non-uniformity, or "mura", of liquid crystal displays (LCDs) was investigated. We conducted a perception test by using pseudo mura and this approach led to "just noticeable differences" according to the various sizes of muras, intending to clarify the detection method and create an automated mura inspection process. The quality level of a mura can be described as a function between the mura area and the contrast, using the minimum perceivable contrast, or the "just noticeable difference" (JND) contrast, at that mura size. We developed the detection method by using a hardware system based on a commercially available CCD camera and a PC and ensured that the mura regions were distinguished from the background area even with the JND contrast. This paper describes the research in human perception and the approach to adapt the intrinsic rule of sensory analysis to the quantitative evaluation of mura.

ジャーナルProceedings of SPIE - The International Society for Optical Engineering
出版ステータスPublished - 2002 12 1
イベントOptomechatronic Systems III - Stuttgart, Germany
継続期間: 2002 11 122002 11 14

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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