Research On Holographic Coding And Display Of Color 3D Scene Based On LCOS

We can get the 3D information of objects intuitively by recognizing the natural world through eyes.Since the twenty-first Century,with the increasing demand for human ornamental,the ordinary two-dimensional display has long been unable to meet,and the 3D display technology has become a hot spot of research.At present,the most widely used stereoscopic display technology in commercial application can not provide all the information of the object,and the holographic 3D display technology can record all the depth information of the object completely,and it has become the research focus of research institutions.With the progress of electronic device technology,the birth of the spatial light modulator is more support for the color holographic 3D display technology.The amplitude and phase of the light wave are modulated in space.The phase spatial light modulator LCOS has the advantages of high diffraction rate,high resolution and small pixel size,and it is widely used.However,because it is a pure phase spatial light modulator,the hologram loaded on it is phase type,and the amplitude information of the object is lost,all depth information of the object can not be rebuilt,and the reconstructed image quality is not high.Building a holographic display system based on LCOS to realize high quality real color three-dimensional display is also the research weight.This paper studies the calculation method of high quality phase diagram based on the characteristics of LCOS,optimizes the algorithm of wave front recording plane,and studies the related research of color 3D display system based on LCOS.The main research work is as follows:1.The current research status of three dimensional display technology and holographic 3D display technology at home and abroad is briefly described.The algorithm of hologram in dynamic holographic display is introduced,and several methods of building the optical path of the color holographic display system based on LCOS are summarized.Some basic theories of holographic display and the encoding of phase diagram in CGH are introduced,and the 4f system for spatial filtering for holographic optoelectronic reappearance is analyzed in detail.2.The modulation characteristics of the liquid crystal spatial light modulator are analyzed.The silicon based liquid crystal spatial light modulator LCOS is introduced,and its basic principle,the pixel structure and the impulse response are analyzed.Through theoretical research,two methods based on phase hologram coding proposed in recent years are analyzed and improved.A high quality coding method,which can accurately reproduce the image of 3D object,is proposed,and the theoretical simulation and experimental proof are given.3.Based on the traditional point source method,the wave front recording algorithm(WRP)is theoretically studied.In view of the current WRP algorithm,the effective distance between the three-dimensional object and the WRP virtual plane,the optimal position of the WRP virtual plane and the optimal partition number of the three-dimensional object in the WRP layer calculation are not given.The hierarchical optimization design of the WRP algorithm is proposed.Based on the research of WRP theory,the relationship between the pixel spacing of WRP virtual plane and the distance of three dimensional object points in the effective plane of WRP plane is given.On this basis,through the numerical simulation and analysis of different three-dimensional objects with different depth of field and the same three-dimensional object with different depth of field according to the WRP method,the optimum stratification number of the three-dimensional object WRP stratified calculation is obtained,and the theoretical simulation and experimental proof are given.4.By studying the theory of matrix optics and scalar diffraction,the 3D display system based on LCOS is studied.The paraxial optical imaging system with a gated filter in the rear of LCOS is considered as an optical system with an aperture of an aperture on an equivalent lens and its focal plane.The optimal encoding of the phase diagram and the optimization of the filter window are derived in theory.The method and the related simulation experiments are given.The research work provides convenience for the practical application of such systems.