DISPLAY DEVICE USING LIGHT GUIDE, ROAD SIGN INCLUDING THE DISPLAY DEVICE AND METHOD FOR MANUFACTURING ROAD SIGN

摘要

PROBLEM TO BE SOLVED: To provide a light guide which contributes to power saving while reducing difference in brightness depending on a place of a principal plane even when light sources are not arranged near the respective apexes where the principal plane curves, and to also provide a display device which can reduce power consumption while maintaining the difference in brightness depending on the place of the principal plane small without arranging the light sources near the respective apexes where the principal plane curves, and a road sign including the display device by using the light guide.SOLUTION: The light guide can contribute to power saving while reducing difference in brightness (uneven brightness) on the whole principal plane even when a light source unit is not provided to a curve part 30a since area ratio of a first diffusion dot 32a and a second diffusion dot 32b occupied in a second diffusion area is larger than area ratio of the first diffusion dot 32a occupied in a first diffusion area.