Patent ID: 9740016
Date: 2017-08-22
CPC Classifications: G02B,H04N

Claim:
1. A polarization conversion system for transmitting polarization encoded imagery to a projection screen, comprising: a first projection lens; a second projection lens; a polarization beam splitter operable to receive image light from an image source, operable to transmit image light of a first polarization state toward the first projection lens on a first image light path, and operable to reflect image light of a second polarization state toward a second image light path; a reflecting element located on the second image light path operable to reflect the image light of the second image light path toward the second projection lens; and a polarization switch located on at least one of the first image light path and the second image light path, the polarization switch operable to selectively alternate the polarization of image light passing therethrough between a first output state of polarization and a second output state of polarization so that the image light passing therethrough has sequentially alternating polarizations; wherein the first projection lens is operable to project the image light of the first image light path onto the projection screen as a first diverging light beam between the first projection lens and the projection screen; wherein the second projection lens is operable to project the image light of the second path image light onto the projection screen as a second diverging light beam between the second projection lens and the projection screen; wherein the first and second projection lenses are further operable to direct the first diverging light beam and the second diverging light beam to superimpose and substantially overlap with each other on the projection screen; wherein the polarization conversion system is positioned between the image source and the projection screen; and wherein the polarization switch operates such that the first and second diverging light beams have the same state of polarization as they simultaneously reach the projection screen.