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Substrate Guided Relay with Image Compensation

  • US 20120281721A1
  • Filed: 05/02/2011
  • Published: 11/08/2012
  • Est. Priority Date: 05/02/2011
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a substrate guided relay that transmits light to an output coupler, where light emerging from the output coupler has a varying brightness as a function of position;

    at least one laser light source;

    a resonant scanning mirror that reflects a light beam from the at least one laser light source and sinusoidally scans the light beam in at least one dimension, wherein the light beam scans more slowly and results in greater perceived brightness at larger angular displacements of the scanning mirror; and

    a brightness compensation circuit to alter drive values that drive the at least one laser light source, the brightness compensation circuit including compensation for both the varying brightness as a function of position as well as the greater perceived brightness at larger angular displacements of the scanning mirror.

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