Compact image projector having a mirror for reflecting a beam received from a polarization beam splitter back to the polarization beam splitter

  • US 7,750,286 B2
  • Filed: 06/19/2007
  • Issued: 07/06/2010
  • Est. Priority Date: 06/19/2007
  • Status: Active Grant
First Claim
Patent Images

1. A device, comprising:

  • a spatial light modulator (SLM);

    a polarization beam splitter (PBS) optically coupled to the SLM;

    a mirror optically coupled to the PBS; and

    first and second quarter-wave plates, wherein;

    the PBS is adapted to direct an input beam to the mirror;

    the mirror is adapted to reflect the beam received from the PBS back to the PBS, wherein the first quarter-wave plate imparts on the reflected beam a first polarization that causes the PBS to direct said reflected beam to the SLM; and

    the SLM is adapted to spatially modulate the beam received from the PBS and direct a resulting spatially modulated beam back to the PBS, wherein the second quarter-wave plate imparts on said spatially modulated beam a second polarization that causes the PBS to direct said spatially modulated beam to an output port to form an output beam.

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