DIRECTIONAL REFLECTION TYPE SCREEN AND IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To expand the horizontal appreciation range of an image display device and to suppress a jump of an image. SOLUTION: The directional reflection type screen has a combined mirror group 1 of mirrors arranged on a substrate and a semicylindrical type lens group 2 which diffuses and reflects light beams along the ridges of the combined mirror group 1 so that the ridges of the combined mirror group 1 and the lens lines of the semicylindrical type lens group 2 are not orthogonal. The image display device is equipped with the directional reflection screen and an image projecting means which projects an image on the directional reflection type screen.