Patent ID: 6986580

Claim:
A method of calibrating a polarized light projector system including a latent color projector adapted to project light including visual information, the method comprising: arranging a pair of polarizers such that transmission of the projected light through the pair of polarizers is substantially inhibited; placing a first retarder between the pair of polarizers; rotating the first retarder to a position that provides substantially the brightest throughput through the pair of polarizers; placing a second retarder between the pair of polarizers and behind the first retarder; rotating the second retarder to a position that provides substantially the least throughput through the pair of polarizers; fixing the angular relationship between the first and second retarders forming a retarder laminate; inserting the retarder laminate between the polarizer closest to the latent color projector and a birefringent rotary tool; rotating the retarder laminate until a color spectrum appears on the rotary tool; and locking the retarder laminate in this orientation relative to the polarizer closest to the latent color projector.