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Substrate-guided imaging lens

  • US 8,000,020 B2
  • Filed: 02/08/2007
  • Issued: 08/16/2011
  • Est. Priority Date: 02/14/2006
  • Status: Active Grant
First Claim
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1. An optical system comprising:

  • a first light-transmitting substrate having at least one major surface and edges;

    a display light source;

    a coupling optical element carried by said substrate, such that light waves from said display source are coupled by said coupling optical element into said substrate by total internal reflection;

    at least one polarizing beam-splitter carried by said substrate, at least one reflecting optical element, and at least one retardation plate;

    wherein said retardation plate is located between at least a portion of the major surface of the substrate and said reflecting optical element and wherein said polarizing beam-splitter reflects light waves which are coupled inside the substrate into said reflecting optical element;

    a second light-transmitting substrate having at least two major surfaces parallel to each other and two edges;

    a second optical element for coupling light into said substrate by internal reflection; and

    at least one partially reflecting surface located in said substrate, which surface is non-parallel to the major surfaces of said second substrate, wherein said second substrate is positioned adjacent to said first substrate.

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