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Variable reflectivity notch filter and optical devices using same

  • US 8,294,993 B2
  • Filed: 07/26/2010
  • Issued: 10/23/2012
  • Est. Priority Date: 07/26/2010
  • Status: Active Grant
First Claim
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1. An image projection system having a display that is at least partially transmissive and partially reflective, the image projection system comprising:

  • a laser projection source having a controller configured to direct laser light to form an image on a display surface; and

    a reflective layer integrated with the display surface, wherein the reflective layer comprises a variable reflectivity notch filter defining a transmission curve comprising a plurality of reflective peaks centered about predetermined wavelengths of light, each reflective peak having an associated reflectivity, wherein a reflectivity of at least one peak is different from a reflectivity of at least another peak, wherein the laser projection source comprises a plurality of laser sources each configured to emit light centered at a predetermined wavelength, wherein the predetermined wavelength changes as a function of temperature across a predefined range from a minimum wavelength to a maximum wavelength, wherein the plurality of reflective peaks are configured to at least partially reflect the minimum wavelength and the maximum wavelength.

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