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DIFFRACTIVE BEAM EXPANDER AND A VIRTUAL DISPLAY BASED ON A DIFFRACTIVE BEAM EXPANDER

  • US 20100214659A1
  • Filed: 06/04/2007
  • Published: 08/26/2010
  • Est. Priority Date: 06/04/2007
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a substantially planar waveguiding substrate;

    an input grating to provide an in-coupled beam propagating within said substrate by diffracting light of an input beam into said substrate;

    a first deflecting grating portion to provide a first deflected beam by diffracting a part of said in-coupled beam such that the difference between the azimuth angle of said first deflected beam and the azimuth angle of said in-coupled beam is negative, said first deflecting grating portion comprising substantially linear diffractive features;

    a second deflecting grating portion to provide a second deflected beam by diffracting a part of said in-coupled beam such that the difference between the azimuth angle of said second deflected beam and the azimuth angle of said in-coupled beam is positive, said second deflecting grating portion comprising substantially linear diffractive features, the diffractive features of said second deflecting grating portion having a different orientation than the diffractive features of said first deflecting grating portion;

    a first restoring grating portion to provide a first restored beam by diffracting light of said first deflected beam;

    a second restoring grating portion to provide a second restored beam, said second restored beam being substantially parallel to said first restored beam; and

    an output grating to provide an out-coupled beam by diffracting light of said first restored beam and said second restored beam out of said substrate, said output beam being substantially parallel to said input beam.

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