title: Speckle suppression in holographic projection displays using temporal integration of speckle images from diffractive optical elements.
abstract: Speckles on images in holographic projection displays (HPDs) were efficiently suppressed by the temporal sum of two diffractive images generated from diffractive optical elements (DOEs). Using a modified iterative Fourier transform algorithm, we obtained pairs of phase-only DOEs that generated the diffractive images with high negative correlation coefficients of -0.827 and -0.490 in the one-dimensional and the two-dimensional simulations, respectively. The suppression ratios of the speckles in the two simulations were 0.301 and 0.457, which were 61% and 35% lower, respectively, than the sum of the two uncorrelated images. We have successfully demonstrated that the sum of two negatively correlated images from DOEs can effectively reduce the image speckles and improve the image quality in HPD systems.
authors.affiliation: Department of Electro-optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan. whsu@ntut.edu.tw
authors.forename: Wei-Feng
authors.initials: WF
authors.lastname: Hsu
authors.forename: Chuan-Feng
authors.initials: CF
authors.lastname: Yeh