Patent ID: 6089719
Filing Date: 2000-07-18
Classification: H04N

Abstract:
A projecting device comprising:an illumination device for emitting a polarized trichrome light which comprises red, green and blue lights of various polarizations;three modulating devices defined as first, second, and third modulating devices, each of the modulating devices being used for reflecting a polarized monochrome light to modulate it and change its polarization; anda light separating device having two dichroic mirrors arranged along a first diagonal direction and two polarization beam splitting mirrors arranged along a second diagonal direction perpendicular to the first diagonal direction;wherein the first dichroic mirror separates the polarized trichrome light into a first polarized monochrome light and a polarized dichrome light, and directs these two lights separately to the first and second polarization beam splitting mirrors, the first polarization beam splitting mirror directs the first polarized monochrome light to the first modulating device and directs the modulated light reflected from the first modulating device to the second dichroic mirror, the second polarization beam splitting mirror separates the polarized dichrome light into second and third polarized monochrome lights which are directed to the second and third modulating devices, and then directs the modulated lights reflected from the second and third modulating devices to the second dichroic mirror, and the modulated lights directed from the first and second polarization beam splitting mirrors are synthesized by the second dichroic mirror to form an output light beam.