A projection-type color image display system uses a reflective liquid
crystal (LC) light modulator (24) and a polarizing beam-splitter (22) for
separating the incoming and reflected light. Light from the source arrives
on a first axis (28) and is reflected outward, with the imposed image,
along a second axis (30) through a projection lens (26). In order to
produce a high contrast image, a pre-polarizer (36, 42, 48) and/or
post-polarizer (44, 50) are used to restore the selectivity and,
consequently, optical system contrast for the wide "cone of acceptance" of
light rays which are common in projection systems. In order to improve the
system contrast, the pre- and/or post-polarizer is arranged along the
first and second axis, respectively, with its polarizer absorbing axis
extending parallel to the normal n of the reflective surface (34, 46) of
the PBS.