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Wide field of view head-up display system

  • US 7,777,960 B2
  • Filed: 04/15/2009
  • Issued: 08/17/2010
  • Est. Priority Date: 09/10/2007
  • Status: Active Grant
First Claim
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1. A system for providing a head-up display, comprising:

  • a laser-projection source;

    a scanner configured to receive light from the laser-projection source and deliver scanned light to a projection surface as a projected image; and

    a control circuit coupled to the scanner and configured to control scanning of the light received from the laser-projection source to form the projected image;

    wherein the projection surface comprises an buried numerical aperture expander comprising;

    an exit pupil expander; and

    a reflective layer disposed on said exit pupil expander;

    wherein the exit pupil expander and the reflective layer are disposed within an envelope, the exit pupil expander and the envelope having substantially similar coefficients of refraction;

    wherein some of the light impinging on the exit pupil expander may be at least partially reflected by the reflective layer and expanded into a larger output numerical aperture, and some of the light impinging on the exit pupil expander is at least partially transmitted without substantial distortion through said reflective layer;

    wherein the projection surface comprises an optical relay disposed along a sub-region of the projection surface, wherein the optical relay comprises;

    a diffractive optical element having an at least partially reflective coating and having a first index of refraction; and

    a filler medium having a second index of refraction and being disposed adjacent to the diffractive optical element;

    wherein the optical relay is at least partially transparent.

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