Patent ID: 7857457

Claim:
A projection system, comprising: an illumination system; a projection unit comprising at least one image-forming device; a projection lens unit; and a screen, the illumination system further comprising: at least a first source of incoherent light capable of generating light in a first wavelength range; a body containing a first fluorescent material that emits light in a second wavelength range, different from the first wavelength range, when illuminated by light in the first wavelength range; and at least a second fluorescent material receiving at least some of the light of at least one of the first and the second wavelength ranges, said second fluorescent material generating light of a third wavelength range, the body having an extraction area, at least some of the light of at least one of the second wavelength and the third wavelength being internally reflected within the body to the extraction area; wherein light in at least one of the second wavelength range and the third wavelength range illuminates the at least one image-forming device, image light from the at least one image forming device being projected by the projection lens unit to the screen.