Unified evaluation method of white uniformity for electronic displays

A unified method that evaluates uniformity grade for both luminance and color components has been developed. Conventional methods evaluate only luminance or color components. The S-CIELAB color system is introduced to realize the visual perceptual functions. The spatial filters are defined by contrast sensitivity functions, and the mura (non-uniform region) index E is defined to evaluate the unified white uniformity grade quantitatively. The 49 pseudo-test samples, which contain luminance variations and color variations, are tested. The experimental results showed strong relations between human sensory evaluation scores and the mura index E values.