| 摘要 |
<p>A method for recovering polarization comprises the steps of: guiding light having first and second polarizations in a forward direction along a light path (27); passing the guided light having the first polarization out of the path; reflecting the light having the second polarization backwardly and forwardly along the light path; transforming the reflected light during the reflecting step to have the first polarization; and, passing the light transformed to the first polarization out of the path, enabling more of the light having the first polarization to be passed out of the path. The method can be implemented with a light integrator (20), a reflecting polarizer (30), at least one reflective surface (26) that further reflects the reflected light back toward the reflecting polarizer and a quarter wave plate (32) positioned in the light path. The method and apparatus can be used in an illumination system (10) for a liquid crystal display imager (24).</p> |
