P‐3.6: Study on the distribution of perceived brightness level based on HK effect in three‐dimensional CIELAB color space of laser display

The current trend in display technology is towards achieving larger color gamut and higher brightness levels. However, it should be noted that visual perception of brightness intensity may differ from physical brightness intensity. The HelmholtzKohlrausch effect(H‐K effect) refers to the phenomenon where the perceived brightness of a color increases as its purity or saturation increases while keeping its luminance constant. In order to investigate the relationship between visual perception brightness and lightness, hue and color purity, an experiment was conducted using an RGB laser television as the display device. A total of 12 subjects participated in the visual perception brightness experiment. Based on the experimental results, the visual perceptual brightness for different color patterns was determined. Subsequently, a multilayer perceptron neural network was employed to depict the variation pattern of visual perception of brightness within the CIELAB color space. Finally, Fairchild's H‐K effect compensation formula was revised using nonlinear least squares method based on these experimental findings.