Patent ID: 6739723
Filing Date: 2004-05-25
Classification: H04N

Abstract:
A projection display system, comprising:a light source emitting a randomly polarized light; a tunnel integrator having an input end and an output end, the input end comprising and input aperture and a reflective inside surface coated with a quarter wave retarder, the randomly polarized light from the light source arriving at the input end of the tunnel integrator, entering the tunnel integrator through the input aperture, and outputting the tunnel integrator at the output end as uniform beam of light; a plurality of dichroic filters coupled to the output end of the tunnel integrator, each of the plurality of dichroic filter disposed to transmit light of one of at least three primary color components; and a four-sided prism coupled in the optical path of the tunnel integrator and the plurality of dichroic filter; wherein the four-sided prism is rotated for scrolling colored light of in each of the at least three primary color components generated by the plurality of dichroic filters.