Research on Color, Luminance and Line Width of HUD Symbols.

Head-up displays (HUDs) can improve pilots’ flight performance and efficiency. The pilot’s cognitive performance is affected by the physical characteristics of HUD, such as character color, luminance, line width, and word height. Through experimental means, by taking contrast sensitivity as a measurement method, and the reaction time as the indicators. We made a comparison of the color and luminance of foreground characters in different sky background samples. The experiment showed that HUD has a better cognitive performance of the character color HSB value (120° 99% 33%) during the daytime, the modulation contrast between foreground luminance and background luminance should be greater than 0.5. The character height of HUD should be greater than 5.84 mrad, and the stroke line width should be greater than 0.73 mrad, which provides a scientific reference for the color design of the HUD interface.