Research On Full-color Holographic Display Technology Based On Multi-plane Iterative Algorithm

Holographic display technology is a very promising three-dimensional display technology,which can record the amplitude information and phase information of the object.With the development of science and technology,The method of hologram calculation has transferred from traditional optical holographic and digital hologram to computer-generated holography(CGH).Compared with the traditional method,CGH has greater flexibility.It can complete the process of the optical interference recording through modeling and encoding,and omit the process of holographic dry plate development and fixing in the traditional method.The recording object of holographic display technology is also changed from the original two-dimensional image to a three-dimensional image and a color image.This paper mainly focuses on the method of hologram calculation and reconstruction process in the full-color holographic display technology.The main research work is as follows:The basic principle of calculating holographic algorithm is described in detail,and the theory of angular spectrum diffraction algorithm is introduced.Several existing full-color holographic display schemes are analyzed,their principles and characteristics are described.A depth division multiplexing(DDM)method with dynamic compensation is proposed to realize full-color holographic display.It solves the problem that the traditional DDM method will lead to the uneven quality level of the reconstructed image in different color channels of the colorful image.The problem is usually shown as follows: the quality of the reconstructed image of the blue channel is the best,the quality of the reconstructed image of the green channel is general,and the quality of the reconstructed image of the red channel is the worst,which leads to a large color difference in the reconstructed full-color image.The optimization method proposed in this paper is to place red,green and blue channels of colorful images orderly at different positions on the same axis.When the optical wave is propagated back and forth between the three monochrome channel image plane and the hologram,the complex amplitudes of the three planes are updated iteratively according to the set order.During the iterative process,the dynamic compensation factor is added to the complex amplitude of each monochrome channel image,which can effectively balance the quality level of the reconstructed image in each monochrome channel.The calculation scheme of the hologram of full-color 3D object with DDM method based on dynamic compensation is realized.After the three-dimensional object is sliced,the images of the red,green and blue channel images of each layer of colorful object are orderly placed at different positions on the same axis,and the red,green and blue channel images are updated iteratively according to the set order.Finally,multi-plane full-color holographic reconstruction can be realized.At the same time,this method is also suitable for the field of dynamic full-color holographic display.Finally,a full-color holographic reproduction experiment system is constructed.The full-color hologram is loaded on the spatial light modulator(SLM),reconstructed by three primary colorful laser,and the results are collected by CCD.The feasibility of this method can be further verified.The full-color holographic reconstructed image is collected by CCD,and the experimental results are analyzed.The experimental results verify the feasibility of the method proposed in this study.Furthermore,photoelectric experiments are carried out to reconstruct multi-plane full-color 3D objects and dynamic full-color images.The experimental results verify the feasibility of the method proposed in this study.