Holographic Video Display System Based On LCOS

3D Display plays a important role in the current social life, while the holographic display will be the most promising technology to achieve true 3D display。Holographic display provides all the information of the object wave, with excellent depth and parallax and all implicative details which are physically and psychologically needed for 3D understanding.In 1947, Dr. Dennis Gabor introduced the holography and he opening up a new area of optical so fundamental that he eventually won, in 1971, the Nobel Prize in Physics. In 1966, Brown and Lohmann, who propose computer-generated holography, made a calculation of the world's first hologram. The generation of computational hologram is completed in computer, which overcame the defects of optical holography which can not realize real time display, display the objects that do not physically exist and needs strict restricted condition. Therefore holographic display based on computational holography is considered as the popular 3-D display technology in the future. In recent years,1994, MIT Media Lab's use AOM achieve the first dynamic three-dimensional holographic display system in the world,2007, based on LCOS TechnologiesGmbH developed a three-dimensional video holographic display system.Spatial light modulator is a crucial device for holographic display, which can modulate incident light according to the input signal. Due to its high efficiency of light use and diffraction in phase-only modulation, SLM has gained great interests. Liquid crystal spatial light modulator especially the liquid crystal on silicon technology-LCOS that has developed in recent years, has so many advantages, high diffraction efficiency, high fill factor, high resolution, and near phase-only modulation is achievable. Liquid crystal spatial light modulator, especially the liquid crystal on silicon technology-LCOS that has developed in recent years, has merits such as high diffraction efficiency, high fill factor, high resolution, and making near phase-only modulation achievable.In this paper, we introduce the classification of SLM first and emphasize the development and current situation.The liquid crystal panel that is made into LCOS panel has been researched, and we use the Jones Matrix to analyze the process of light modulation in the LCOS panel. An improved FDTD algorithm is introduced, to simulate the propagation of light through LCOS. In addition, the phase modulate range and reflex reflectivity of the three five systems company's latest LCOS panel were measured by specific experiment. Based on two different LCOS panels, we built holographic video display systems, and holographs were generated with phase-only encoding,and resulted well. Finally, the results of two holographic video display systems were compared, and, we will give the result that which kind of LCOS panel is suitable for holographic video display systems.