Spatial-domain computer generated holographic three-dimensional display

Three-dimensional (3D) display has been made great progress in recent years due to the development of the fields on optical information and computer science technologies. Holography enables to provide accurate depth cues of 3D objects and has attracted much attention. Computer generated hologram (CGH) is one of the exceptional way to utilize vivid 3D scene of both virtual and real objects. However, time-consuming holographic computation and ultra-narrow viewing angle are two main disadvantages. The provement on the computer Fraunhofer formulism in Fresnel region is reviewed. Spatial-domain Fraunhofer CGH algorithm, a method, which is used to generate hologram of polygon-based 3D model is systematically introduced. Based on this method, the problems on occlusion, shading, and texture are solved. Also a 4f optical system by time division multiplexing and spatial tiling technique is reviewed. This method can be used in the computation of other complicated 3D scenes with large amounts of data, which is helpful to the development of holographic display.