CSD-A New Unified Threshold Metric of Evaluating LCD Viewing Angle by Color Saturation Degradation

Szu Fen F. Chen, Wei-Chung Cheng, Han-Ping Shieh

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Lower luminance contrast ratio and chromatic changes affect the visual performance (i.e. color shift) of a thin-film transistor liquid-crystal device (TFT-LCD) at large viewing angles. The de facto method of defining viewing angle, contrast ratio of luminance, fails to represent the substantial visual performance viewed at a larger angle. We found the degradation of color saturation, dS*/d theta, to be an appropriate metric to aid the conventional viewing angle definition (CR >= 0). We empirically determined the threshold for defining the color viewing angles of TFT-LCDs, CVA = {theta parallel to dS*/d theta vertical bar <= 0.03} which reflects the variation not only in chromaticity but also in luminance. The proposed metric was evaluated by psychophysical experiments, whose results validate the efficacy of the proposed metric.
Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalJournal of Display Technology
Volume2
Issue number2
DOIs
StatePublished - Jun 2006

Keywords

  • Color saturation degradation (CSD) metric; contrast ratio metric; just-noticeable difference (JND); liquid-crystal device (LCD) viewing angle evaluation; psychophysical evaluation

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