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A new method to evaluate the readability of head up display

By researching about PJND (Perceptible Just Noticeable Difference) theory, this paper established an evaluation method of head up display readability based on PJND, combined with the characteristic of head up display. By simulation, this paper got some disciplinary results that how the chromaticity of background, interferences (specular reflection, diffuse reflection and glare) impacts the readability of head up display. Simulation result shows that, the differences between background chromaticity and object chromaticity bigger, head up display needs a lower luminance contrast; when the environment luminance is constant and the interferences increase, we need a bigger luminance contrast to satisfy the readability; when the environment luminance and luminance contrast are all constant, to satisfy the readability, the maximum of the interference is limited.