High performance projection display with two light valves

摘要

The projection display comprises two reflective liquid crystal light valves positioned and aligned relative to each other on two adjacent surfaces of a polarizing beam splitter cube. Illumination is introduced through a third face of the cube, and a projection lens images the two light valves through a fourth surface of the polarizing beam splitter cube. Colour-sequential and alternating polarization states are provided by a colour filter wheel or cage containing individual facets of dichroic or colour glass filters, such that as the wheel or cage rotates, the filters change and produce sequential red, green and blue outputs. In addition, the polarization of adjacent colours is alternated by adding a polarizing film onto each colour filter.