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Proceedings Paper

Visibility of hue, saturation, and luminance deviations in LEDs
Author(s): Pieter J. H. Seuntiëns; Ingrid M. L. C. Vogels; Eva B. Kraaijenbrink
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Paper Abstract

It is well known that LEDs have problems with color consistency and color stability over time. Two perception experiments were conducted in order to determine guidelines for the color and luminance deviations between LEDs that are allowed. The first experiment determined the visibility threshold of hue, saturation, and luminance deviations of one LED in an array of LEDs and the second experiment measured the visibility threshold of hue, saturation, and luminance gratings for different spatial frequencies. The results of the first experiment show that people are most sensitive for color deviations between LEDs when a white color is generated. The visibility threshold for white was 0.004 &Dgr;u'v' for a deviation in the hue of the LED primaries, 0.007 &Dgr;u'v' for a deviation in the saturation of the LED primaries and 0.006 &Dgr;u'v' for a deviation in the luminance of the LED primaries. The second experiment showed that the visibility of hue gratings is independent of spatial frequency in the range of 0.4 to 1.2 cycles/degree. However, for saturation and luminance gratings there was a significant effect of spatial frequency on the visibility threshold. Both experiments show that observers are more sensitive to hue than to saturation deviations.

Paper Details

Date Published: 14 March 2007
PDF: 12 pages
Proc. SPIE 6492, Human Vision and Electronic Imaging XII, 64920U (14 March 2007); doi: 10.1117/12.699045
Show Author Affiliations
Pieter J. H. Seuntiëns, Philips Research (Netherlands)
Ingrid M. L. C. Vogels, Philips Research (Netherlands)
Eva B. Kraaijenbrink, Philips Research (Netherlands)

Published in SPIE Proceedings Vol. 6492:
Human Vision and Electronic Imaging XII
Bernice E. Rogowitz; Thrasyvoulos N. Pappas; Scott J. Daly, Editor(s)

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