Patent ID: 8310764

Claim:
An image display device comprising: a point light source; a diffusing member comprising a diffusing surface in which recesses and protrusions are formed in one direction with a plurality of pitches, for diffusing light traveling from the light source by the diffusing surface in the one direction and emitting the diffused light; a display element comprising a plurality of pixels and a light-shielding section formed around the plurality of pixels, for displaying an image by modulating light traveling from the diffusing member with the plurality of pixels; and an ocular optical system for guiding light of an image traveling from the display element to an optical pupil, to make an observer observe a virtual image of the image at the optical pupil, wherein the image display device satisfies the following conditional expression (1), where Hw is an aperture width of the pixels of the display element in a diffusing direction of the diffusing member, Kw is a maximum pitch of the recesses and protrusions in the diffusing direction of the diffusing member, f is a focal length of the ocular optical system, and δ is a distance from a display surface of the display element to the diffusing surface of the diffusing member: Hw/f ≦tan 1′≦ Kw /( f +δ) (1).