Design Of Full-color Dynamic Computer-generated-hologram Algorithm And Development Of Novel Holographic Display Device

Holographic display technology has become a hot topic in the field of display because it can completely record and reconstruct the wavefront of three-dimensional(3D)objects.Traditional optical holography technology can only record the static images of 3D real scenes due to the limitation of the irretrievability of recording medium.And there are twinned images in the imaging process.With the development of computer and optoelectronic technology,computer-generated hologram(CGH)has attracted people's extensive attention and in-depth research.It can adopt a refreshable spatial light modulator instead of a holographic medium to realistically reproduce true or virtual full-color dynamic 3D scence,which can theoretically satisfy all the requirements of the human eye for stereoscopic vision.And the real-image or virtual-image can also be selected as needed for display.However,due to the limitation of current spatial light modulation devices,the quality of full-color 3D scenes that represented by CGH is far from meeting people'needs,and it is also facing the problems of slow calculation speed,complex system,and high cost.This thesis first describes the development of full-color holographic display technology.A fast and efficient multiplexing encoding algorithm is proposed to realize high-quality full-color holographic display by using one spatial light modulator.This algorithm can also be used to design the hologram based on graphene oxide materials to realize full-color 3D display.On the other hand,in order to break through the limitations of the existing spatial light modulation devices,an ultra-thin holographic display device is designed by using the phase modulation characteristics of the topological insulating material in the visible light band,which effectively expands the system's spatial bandwidth product.A full-color holographic display scheme is proposed by using curved holograms based on graphene oxide materails,which can effectively increase the viewing angle of the reconstructed 3D image.Specific research content includes:1.The mathematical foundation of CGH technology is studied in depth.Based on the basic theory of wave optics,the CGH coding methods are systematically explored,and the principle of color superposition matching in full-color holographic display is studied and analyzed.2.A full-color holographic display method based on multiplexing encoding method is proposed.Based on the multi-wavelength multiplexing holographic encoding technology,a high-quality full-color dynamic 3D display by using single spatial light modulator is achieved,reducing the size and cost of the system.The multiplexing encoding technology uses the analytical method to obtain a color hologram,avoiding the traditional iterative optimization algorithm and greatly reducing the hologram calculation time.The multiplexing coding algorithm can also be applied to the design of full-color 3D display of based on graphene oxide holograms,and a good reconstruction effect is obtained.3.An ultra-thin holographic display method based on a topological insulator material with a thickness of nanometer is proposed for the first time.Sb₂Te₃ thin film with a thickness of60 nm was deposited on a silicon substrate by atomic layer deposition.Then,a hologram with a pixel size of 2?m was fabricated by a multifocal-array laser direct writing system,effectively increasing the information density of hologram.The optical reconstruction experiment was performed and the results show that Sb₂Te₃has good optical modulation characteristics in the visible light band.4.A full-color holographic display scheme is designed by using curved holograms based on graphene oxide materail.The method of calculating the curved hologram is studied.The influence of the curvature of the curved hologram on the viewing angle and the viewing zone of the reconstructed image is analyzed.On this basis,the design parameters of the curved hologram are given,and a numerical simulation experiment is performed.The graphene oxide film was also prepared based on a flexible substrate.The processing method of the curved hologram and a practical full-color holographic display scheme are given at last.