Research On Optimization Of Double-phase Holographic Display Based On LCoS

With the continuous development and popularization of 3D display,holographic display technology,as one of the most promising technologies to achieve real 3D display,has been applied in medical,military,entertainment and many other areas,changing people's work and life.Because of its flexibility and convenience,computer-generated holography has become a hot topic for researchers to explore holographic technology further.The research of this paper is mainly about the optimization based on double-phase hologram(DPH)algorithm which does not need iterative operation.Firstly,based on scalar diffraction theory,LCoS imaging principle and sampling theorem,the basic theory of DPH algorithm is analyzed in detail.And the experimental factors such as blazed grating phase factor,initial phase mask and the size of filter are simulated.Then,under the condition of constant initial phase,the holographic display experiment is carried out.By adding blazed grating factor and using filter,the zero-order spot is eliminated from the reconstructed image.On the basis of DPH algorithm,two methods are proposed to improve the reconstruction quality in this paper.Since the interference between macro-pixels is one of the main noise sources of DPH algorithm,in order to reduce the interference,the first method is to separate the adjacent macro pixels in the hologram and play the sub-holograms in time sequence,which can effectively improve the recovery of image details.Secondly,in order to achieve better dynamic display,a macro-pixel phase rearrangement method is proposed,which does not increase the complexity of the original algorithm.By adjusting the internal phase arrangement and initial phase information of adjacent macro-pixels,the interference of adjacent macro-pixels is effectively reduced and the quality of the whole reconstructed image is improved.Finally,taking advantage of the simple calculation and short time-consuming of DPH algorithm,the real-time dynamic display operation is realized by using the proposed macro-pixel phase rearrangement method,and also a simple operation page is designed.This proves the great application potential of DPH algorithm in dynamic display.At the end of this paper,the problems existing in the current work are summarized,and the future research direction is prospected.