Patent ID: 7222975

Claim:
A dual lamp illumination system, adapted for a projection display system, comprising: a first illumination module and a second illumination module, each comprising a light source, and an elliptically-shaped housing having an interior reflective coating, the light sources each generating an optical beam comprising converging optical rays, the optical beams each having an angular distribution range of [−P, +Q] degrees, P, Q being real numbers, wherein each of the first illumination module and the second illumination module further comprises a beam expander, for reducing the angular distribution range of the optical beams generated by the light sources of the first illumination module and the second illumination module; a beam deflecting unit, positioned on the paths of the optical beams of the first illumination module and the second illumination module, wherein the first illumination module and the second illumination module face different sides of the beam deflecting unit, the beam deflecting unit reflects at least one of the optical beams from the first illumination module and the second illumination module and couples the optical beams from the first illumination module and the second illumination module to form a multiplexed beam which converges at a focal point; and a light homogenizer, for homogenizing the multiplexed beam.