Method of producing a holographic projection screen for displaying a three-dimensional color images

Abstract

A method of producing a holographic screen for projection of the three-dimensional color images is proposed, where a narrow and elongate slit-shaped diffuser is recorded on the hologram as an object to ensure the well-defined viewing zone forming in the course of the image projection. As compared with the previous art the diverging reference beam is used for the screen recording, therefore only small size optical elements are used in the recording setup. When screen is illuminated by the projector, the reconstructed real images of the diffuser are formed behind the screen for each color of the projector light spectrum. A viewing zone, wherefrom a full color image can be seen as projected on the screen, is obtained by making the length of the diffuser big enough to provide overlaps of the various color diffuser images of the projector light, diffracted on the screen. The parameters required for the recording of the holographic screen, including the position of a photoplate with respect to the diffuser, the distance from which an image is observed, the position of a reference wave point source with respect to the diffuser, and so on, are determined by consideration of the phase relationships between the reference, object, projector and reconstructed waves on the photographic plate surface.