An autostereoscopic display system and a method of displaying a scene in a
stereoscopic form on a screen of the system include two or more
reconfigurable holographic optical element (HOE) stacks in the screen. The
reconfigurable HOEs may be configured to perform simple optical functions
that are commonly associated with traditional optical devices, such as
lenses, prisms and mirrors. However, the reconfigurable HOEs may also be
configured to perform sophisticated optical manipulations, such as
optimally diffusing light with respect to light intensity toward a
predefined viewing region. Each reconfigurable HOE includes a hologram
that is sandwiched between two electrode layers. The hologram is a
holographic photopolymeric film that has been combined with liquid
crystal. The hologram has an optical property that changes in response to
an applied electrical field. The reconfigurable HOE stacks are utilized to
optimally diffuse monochromatic images projected from an image generator
to one or more observers, such that the observers can view the scenes
displayed on the screen in a stereoscopic form. Each reconfigurable HOE
stack includes three reconfigurable HOEs to sequentially diffuse the
monochromatic images of the tristimulus colors. The number of
reconfigurable HOE stacks included in the screen depends on the maximum
number of observers that can be accommodated by the system. The system may
include one or more imaging devices to detect the presence of observers
and to determine their locations, so that only pertinent images are
projected and diffused by the system.