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  • US 7,777,819 B2
  • Filed: 10/18/2006
  • Issued: 08/17/2010
  • Est. Priority Date: 11/10/2005
  • Status: Active Grant
First Claim
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1. A method of modifying a display apparatus by replacing in the display apparatus a first reflective image generator having first mechanical or optical properties with a second reflective image generator having second mechanical or optical properties, the display apparatus including:

  • a primary relay lens arrangement having a fixed focal length;

    a visor;

    a display source arranged to image the primary relay lens arrangement;

    wherein the primary relay lens arrangement is arranged to transmit the image from the display source to the visor; and

    wherein the display source includes;

    a first image generator arranged to generate an image; and

    a first display source relay optical arrangement;

    wherein the first image generator is arranged to image the first display source relay optical arrangement; and

    the first display source relay optical arrangement has a first focal length which is selected according to the first mechanical or optical properties to transmit a correctly sized image to the primary relay lens arrangement;

    the method comprising;

    replacing the first image generator with a second different image generator; and

    replacing the first display source relay optical arrangement with a second different display source relay optical arrangement having a second different focal length which is selected according to the second different mechanical or optical properties to transmit a correctly sized image to the primary relay lens arrangement, andwherein the display apparatus further comprises a first output screen arrangement for matching a first numerical aperture of the first display source relay optical arrangement with a numerical aperture of the primary relay lens arrangement, the method comprising replacing the first output screen arrangement with a second different output screen arrangement which matches a second different numerical aperture of the second different display source relay optical arrangement with the numerical aperture of the primary relay lens arrangement.

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