Color dependence with horizontal-viewing angle and colorimetric characterization of two displays using different backlighting

José J. Castro; Antonio M. Pozo; Manuel Rubiño

doi:10.1117/12.2026171

18 November 2013 Color dependence with horizontal-viewing angle and colorimetric characterization of two displays using different backlighting

José J. Castro, Antonio M. Pozo, Manuel Rubiño

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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87854C (2013) https://doi.org/10.1117/12.2026171
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

In this work we studied the color dependence with a horizontal-viewing angle and colorimetric characterization of two liquid-crystal displays (LCD) using two different backlighting: Cold Cathode Fluorescent Lamps (CCFLs) and light-emitting diodes (LEDs). The LCDs studied had identical resolution, size, and technology (TFT – thin film transistor). The colorimetric measurements were made with the spectroradiometer SpectraScan PR-650 following the procedure recommended in the European guideline EN 61747-6. For each display, we measured at the centre of the screen the chromaticity coordinates at horizontal viewing angles of 0, 20, 40, 60 and 80 degrees for the achromatic (A), red (R), green (G) and blue (B) channels. Results showed a greater color-gamut area for the display with LED backlight, compared with the CCFL backlight, showing a greater range of colors perceptible by human vision. This color-gamut area diminished with viewing angle for both displays. Higher differences between trends for viewing angles were observed in the LED-backlight, especially for the R- and G-channels, demonstrating a higher variability of the chromaticity coordinates with viewing angle. The best additivity was reached by the LED-backlight display (a lower error percentage). LED-backlight display provided better color performance of visualization.

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José J. Castro, Antonio M. Pozo, and Manuel Rubiño "Color dependence with horizontal-viewing angle and colorimetric characterization of two displays using different backlighting", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87854C (18 November 2013); https://doi.org/10.1117/12.2026171

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KEYWORDS

LCDs

Light emitting diodes

Visualization

LED backlight

LED displays

CIE 1931 color space

Transmittance

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