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Virtual screen display device

  • US 6,292,305 B1
  • Filed: 08/24/1998
  • Issued: 09/18/2001
  • Est. Priority Date: 08/25/1997
  • Status: Expired due to Term
First Claim
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1. A virtual screen display apparatus comprising:

  • a display arranged to generate display information and having an effective diagonal length DLC;

    an optical projecting element arranged to receive the display information from the display and to project and form an image, the optical projecting element having an effective F number which is defined by Fe=S1/PuD wherein S1 is a distance between the display and a principal point of the optical projecting element and PuD is a diameter of an exit pupil of the optical projecting element; and

    a field optical element arranged to form an in-space image in a position of a virtual screen and to direct a divergent light flux from the virtual screen to a view region where the image is viewable to an observer;

    wherein a diameter of a range in which the image is viewable to the observer in the view region is ERD and a diagonal length of the virtual screen is VSD and a distance between the virtual screen and the view region is VSP, and the following equation is satisfied;

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