Patent ID: 7369316

Claim:
An optical system for a digital light projection system, the optical system comprising: at least one LED array, wherein each LED array comprises a plurality of LEDs; and an optical concentrator element positioned substantially adjacent to each LED array, wherein each concentrator element reflects light emitted from the plurality of LEDs within the corresponding LED array so as to provide reflected light at an output surface of each concentrator element; and an aperture element positioned substantially adjacent to the output surface of each concentrator element, wherein the aperture element includes a reflective surface and an aperture defined by the reflective surface, wherein the reflective surface faces the output surface of each concentrator element such that a first portion of the reflected light is intended for projection through the aperture without reflection by the reflective surface, while a second portion of the reflected light is reflected by the reflective surface back into the concentrator element to thereby provide light which is additionally reflected within the concentrator element, and wherein the first portion of the reflected light and the additionally reflected light is spatially combined at the output surface of each concentrator element at the aperture to thereby provide substantially uniform light which is projected through the aperture.