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* /dθ, to be an appropriate metric to aid the conventional viewing angle definition (CR≥10). We empirically determined the threshold for defining the color viewing angles of TFT-LCDs, CV A = {θ||dS* /dθ| ≤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.
© 2006 IEEE
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