LUMINANCE CONTRAST STUDY OF LED TRAFFIC SIGNS

摘要

This study investigates the legibility and visual comfort of LED traffic signs in relations to the luminance of green background and the luminance contrast. The contrast is defined as the ratio of green-background luminance to white-text luminance. The results show that the luminance contrast is a significant factor for both the legibility and visual comfort, while the green-background luminance is not. Mathematical models of legibility and visual comfort are constructed as functions of luminance contrast and green-background luminance. Operating suggestions for LED traffic signs are drawn from the models to provide satisfactory legibility and visual comfort.