Patent ID: 8591035

Claim:
A display device comprising: a projection device that makes a projected light exit therefrom; a parallelizing element that converts the projected light from the projection device into a nearly parallelized light; an image projected plane which the projected light exiting from the projection device enters via the parallelizing element, the image projected plane having light reflectivity on which an image by the projected light is formed; and an imaging element provided between the parallelizing element and the image projected plane, the imaging element forming another image of an image located on one side of the element plane in a position in a space on the other side of the element plane such that the image and the other image are symmetric with respect to the element plane, wherein the imaging element makes a light which has entered the element plane almost perpendicularly from the parallelizing element travel in a straight line and forms an image by a light that has obliquely entered the element plane among diffuse lights from the image projected plane, such that a position from which the light has obliquely entered the element plane and a position in which the image is formed are symmetric with respect to the element plane, and thereby forms a real image of the image on the image projected plane.