Patent ID: 7095558

Claim:
An image display device comprising: an image generation source; an optical part for projecting an image from said image generation source on a larger scale; and a rear projection type screen for displaying a projection image projected thereon from said image optical part, said rear projection type screen including: a Fresnel lens sheet disposed on said image generation source side; a diffusion sheet for diffusing image light to an image monitoring side; a total reflecting prism portion formed on the image generation source side of said Fresnel lens sheet, said total reflecting prism portion being formed in an area in which the angle of incidence of the projection image projected from said optical part on said Fresnel lens sheet is at least about 40 degrees, said total reflecting prism portion causing the incident light to be outputted as output light at a predetermined output angle by a total reflection phenomenon after a first refraction phenomenon; and a refracting prism portion formed on the image monitoring side of said Fresnel lens sheet, said refracting prism portion being formed in an area opposed to the portion where said total reflecting prism portion is not formed and outputting light at a predetermined output angle by a second refraction phenomenon.