Because the information content of a hologram is extraordinarily large, information reduction is essential to the realization of a practical electro-holographic display system. We have investigated a sub-sampling method to reduce the information content of an electro- holographic display. This sub-sampling, however, also causes a blurring of the displayed 3D images. We discuss both the theory of the relation between the information reduction rate and the image blur and our experimental results.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.