A hologram of a virtual object or an object which actually exists is formed and a solid image is displayed. 3-dimensional information of the object to be displayed is divided into regions in the depth direction. Depth images are formed as 2-dimensional images where are seen from a plurality of ...http://www.google.com/patents/US5852504?utm_source=gb-gplus-sharePatent US5852504 - Stereoscopic display method of hologram and its forming method and its stereoscopic display apparatus 
