A glasses-free (auto-stereoscopic) 3D display that will serve several viewers who have freedom of movement over a
large viewing region is described. This operates on the principle of employing head position tracking to provide regions
referred to as exit pupils that follow the positions ofthe viewers' eyes in order for appropriate left and right images to be
seen. A non-intrusive multi-user head tracker controls the light sources of a specially designed backlight that illuminates
a direct-view LCD.
A method of encoding computer-generated holograms, which is matched to the recently developed one-step phase retrieval (OSPR) algorithm, is described. Continuous amplitude and binary phase modulators are coupled to enable the encoding of the entire Fourier plane real axis, and an implementation using commonly available reflective and transmissive devices is described. It is shown that, if a binary phase spatial light modulator (SLM), employing high switching angle liquid crystal (LC) material, is deployed in such a coupled modulator arrangement, the resultant reconstructed images exhibit signal-to-noise ratios some 3.5 and 15 times greater than those currently achievable with continuous and binary phase modulation, respectively.