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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsT. Yoshizawa
Pages715-722
Number of pages8
Volume4902
DOIs
Publication statusPublished - 2002
Externally publishedYes
EventOptomechatronic Systems III - Stuttgart, Germany
Duration: 2002 Nov 122002 Nov 14

Other

OtherOptomechatronic Systems III
CountryGermany
CityStuttgart
Period02/11/1202/11/14

Fingerprint

Liquid crystal displays
discrimination
liquid crystals
evaluation
CCD cameras
Luminance
Inspection
Hardware
luminance
nonuniformity
quantitative analysis
inspection
hardware
Sensory analysis

Keywords

  • Human perception
  • Liquid crystal display
  • Mura
  • Quantitative evaluation
  • Sensory analysis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Mori, Y., Yoshitake, R., Tamura, T., Yoshizawa, T., & Tsuji, S. (2002). Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation. In T. Yoshizawa (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4902, pp. 715-722) https://doi.org/10.1117/12.467711

Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation. / Mori, Yumi; Yoshitake, Ryoji; Tamura, Tohru; Yoshizawa, Toru; Tsuji, Satoshi.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / T. Yoshizawa. Vol. 4902 2002. p. 715-722.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mori, Y, Yoshitake, R, Tamura, T, Yoshizawa, T & Tsuji, S 2002, Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation. in T Yoshizawa (ed.), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4902, pp. 715-722, Optomechatronic Systems III, Stuttgart, Germany, 02/11/12. https://doi.org/10.1117/12.467711
Mori Y, Yoshitake R, Tamura T, Yoshizawa T, Tsuji S. Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation. In Yoshizawa T, editor, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4902. 2002. p. 715-722 https://doi.org/10.1117/12.467711
Mori, Yumi ; Yoshitake, Ryoji ; Tamura, Tohru ; Yoshizawa, Toru ; Tsuji, Satoshi. / Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation. Proceedings of SPIE - The International Society for Optical Engineering. editor / T. Yoshizawa. Vol. 4902 2002. pp. 715-722
@inproceedings{c6f92c863ce248beb2b7f5c6fa9d574a,
title = "Evaluation and discrimination method of {"}mura{"} in liquid crystal displays by just noticeable difference observation",
abstract = "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.",
keywords = "Human perception, Liquid crystal display, Mura, Quantitative evaluation, Sensory analysis",
author = "Yumi Mori and Ryoji Yoshitake and Tohru Tamura and Toru Yoshizawa and Satoshi Tsuji",
year = "2002",
doi = "10.1117/12.467711",
language = "English",
volume = "4902",
pages = "715--722",
editor = "T. Yoshizawa",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Evaluation and discrimination method of "mura" in liquid crystal displays by just noticeable difference observation

AU - Mori, Yumi

AU - Yoshitake, Ryoji

AU - Tamura, Tohru

AU - Yoshizawa, Toru

AU - Tsuji, Satoshi

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

KW - Human perception

KW - Liquid crystal display

KW - Mura

KW - Quantitative evaluation

KW - Sensory analysis

UR - http://www.scopus.com/inward/record.url?scp=0036984286&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036984286&partnerID=8YFLogxK

U2 - 10.1117/12.467711

DO - 10.1117/12.467711

M3 - Conference contribution

VL - 4902

SP - 715

EP - 722

BT - Proceedings of SPIE - The International Society for Optical Engineering

A2 - Yoshizawa, T.

ER -