An optical structure placeable between a backlight array of point light
sources and a planar display. The structure distributes light emitted by
the point light sources to uniformly illuminate the plane of the display,
without introducing significant viewing parallax. The emitted light is
partially collimated within a preferred angular viewing range, maximizing
the display's luminance when viewed from the normal direction. The
structure is highly reflective, such that a substantial portion of any
non-emitted light rays are internally reflected by the structure,
increasing the likelihood that those rays will be subsequently emitted by
the structure.