Head-up display device

Abstract

Light emitting devices are aligned along one alignment direction. A first diffusion plate diffuses the illumination light from each of the light emitting devices. A condensing unit exerts a condensing action on the illumination light diffused with the first diffusion plate in a vertical direction perpendicular to the alignment direction. An image forming unit has an illumination target surface illuminated with the illumination light, which is condensed with the condensing unit, and allows a part of the illumination light incident on the illumination target surface to pass therethrough to form the image and to emit display light of the image as a light flux. A second diffusion plate is located on an optical path between the condensing unit and the image forming unit to again diffuse the illumination light condensed with the condensing unit and to cause the diffused illumination light to incident on the illumination target surface.