| 摘要 |
A light recovery system for a projection display with a reflector having a first and a second focal points. A source of electromagnetic radiation is disposed proximate to the first focal point of the reflector to emit rays of radiation that reflect from the reflector and converge substantially at the second focal point. A retro-reflector reflects at least a portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector to increase the flux intensity of the converging rays. A light pipe with an input surface and an output surface is disposed with the input surface proximate to the second focal point to collect and transmit substantially all of the radiation. A first reflector is disposed proximate to the output surface to transmit a first band of radiation while reflecting a second and third bands of radiation. A second reflector is disposed proximate to the output surface to transmit the second band of radiation while reflecting the first and third bands of radiation. A third reflector is disposed proximate to the output surface to transmit the third band of radiation while reflecting the first and second bands of radiation. In the alternative, a PBS is disposed proximate to the output surface to collect and polarize substantially all of the radiation into a radiation of a first polarization and a second polarization. Radiation of the first polarization is transmitted, while radiation of the second polarization is reflected toward the output surface. A wave plate is disposed in a path of the radiation of the second polarization.
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