Projection display having an angle-selective coating for enhanced image contrast, and method for enhancing image contrast

摘要

A projection display includes a light source, a spatial light modulator that receives a light from the light source, and an angle-selective coating disposed to receive the light beam from the spatial light modulator. The angle-selective coating is oriented at a non-zero inclination angle to the light beam. The angle-selective coating has a higher transmission for light that is incident upon the angle-selective coating at an incidence angle within an acceptance-angle deviation from a design incidence angle, than for light that is incident upon the angle-selective coating at an incidence angle greater than the acceptance-angle deviation from the design incidence angle. The projection display preferably includes a TIR (total internal reflection) prism disposed to reflect a light beam from the light source to the spatial light modulator, and to receive the light beam from the spatial light modulator. The angle-selective coating is preferably buried within the TIR prism.