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Optical apparatus with flipped compound prism structures

  • US 7,545,569 B2
  • Filed: 11/08/2006
  • Issued: 06/09/2009
  • Est. Priority Date: 01/13/2006
  • Status: Active Grant
First Claim
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1. An optical apparatus comprising:

  • a) a light guide;

    b) an optical member comprising a body of optically transmissive material and having a textured major surface with an everted configuration or an inverted configuration;

    the optical member being oriented such that the textured major surface receives light from said light guide and then said light passes through said body;

    the textured surface comprising a first plurality of non-intersecting elongate features with a predetermined pitch and a second plurality of non-intersecting elongate features with a predetermined pitch;

    the pluralities being angled with respect to each other by less than about 90° and

    intersecting each other so as to form total internal reflection structures;

    c) a spatial light modulator with rows or columns of pixels for receiving light from the optical member at a major surface;

    d) adjacent first and second elongate features of the first plurality and adjacent first and second elongate features of the second plurality forming a projection extending away from said body and reaching an apex line for an everted configuration of the body or forming a projection extending towards said body and reaching an apex line for an inverted configuration of the body; and

    e) the apex line being shorter than either the pitch of the first plurality and the pitch of the second plurality.

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