Patent ID: 6909556
Filing Date: 2005-06-21
Classification: G02B

Abstract:
1. A kernel, comprising: a prism assembly arranged in four quadrants, comprising, an input face on the first quadrant, a first face and a second face on the second quadrant, an output face on the third quadrant, and a third and a fourth face on a fourth of the four quadrants; wherein: one of the four faces has an attached red microdisplay; one of the four faces has an attached green microdisplay; one of the four faces has an attached blue microdisplay; the prism assembly includes optical components that facilitate the division of light entering the prism assembly through the input face into component red, green and blue light beams that are individually directed to a corresponding one of the red, green, and blue microdisplays where the light beams are reflected and then directed to the output face; each quadrant comprises a pathlength matched beamsplitter arranged in a pathlength matched position in the prism assembly; and at least one of the pathlength matched bearnsplitters comprises two prisms mated together with over lapping corners, wherein an amount of overlap in the overlapping corners is directly proportional to pathlength differences through each of the prisms.