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Redistributing parallax images by light directing element such as grating is one of the most important methods to achieve 3D display.This paper gives an introduction of how parallax barrier works to realize 3D display.The mathematical model of beams out of multi-period of barrier has been built to explore the roles played by barrier and width of sub pixel.Software to simulate the optical field in front of the 3D display has been developed.Both property of view zone and brightness of the display should be considered in order to get better 3D result.This study shows that the slit ratio for parallax barrier should between 0.2 and 0.3.In the process of prototype making the scale was set to 0.25.Particular bright backlight module was applied to compensating the lower brightness caused by lower scale and the display got a satisfactory result.The result has directive meaning for design of 3D display based on parallax barrier.

As the magnification chrometism caused from different wavelengths of color lasers in the optoelectric reconstruction based on a spatial light modulator effects on the quality of reconstructed images,this paper focuses on the reason that the magnification chromatism arises.In order to remove the magnification chromatism,it proposes a method to sample the three color objects with disparity in the process of hologram computing to improve the image quality.A full color electro-holographic system based on a time shearing method is established and holograms computed by the Iterative Fourier Transform Algorithm(IFTA) are reconstructed.The experiment indicates that the magnification chromatism 33.6% for red and 12.5% for blue can be both removed,which shows that the method proposed is verified by experiment results.