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Projection device with a folded optical path and wire-grid polarizer

  • US 7,789,515 B2
  • Filed: 05/17/2007
  • Issued: 09/07/2010
  • Est. Priority Date: 05/17/2007
  • Status: Expired due to Fees
First Claim
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1. A projection display device for displaying an image, comprising:

  • a) a screen having a front defined by where the image is viewed and a rear;

    b) a mirror opposing the rear of the screen and oriented at an acute angle with respect to the screen;

    c) a retarder disposed between the screen and the mirror;

    d) a wire-grid polarizer substantially contiguous with the screen and having an array of parallel conductive nano-wires with a period less than 200 nm; and

    e) an image projection engine oriented to direct a polarized image beam containing an image towards the wire-grid polarizer with the image beam having a linear polarization and an optical axis; and

    f) the polarized image beam of the linear polarization propagating in a plane oriented;

    i) to contain a nano-wire of the array and ii) with an incidence angle with respect to the array greater than 45 degrees and iii) not within a plane of incidence with respect to the array.

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