PRESENCE DISPLAY DEVICE

PROBLEM TO BE SOLVED: To display a video with much presence by using an infinity display system by setting a distance between a video display means and an image- formation optical means to length approximate to the focal length of a Ferns lens constituting the image-formation optical means within the focal length thereof. SOLUTION: An observer 3 views an actually taken video displayed on the video display means 1 through the Fresnel lens 2. When it is assumed that the distance between the lens 2 and the means 1 is (a) and the focal length of the lens 2 is (f), the ratio of the size X of the video on the means 1 to the size Y of the displayed video 4 is expressed as Y/X=f/(a-f). In the case of 0