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Compact optical system for use in virtual display applications

  • US 6,222,677 B1
  • Filed: 11/10/1999
  • Issued: 04/24/2001
  • Est. Priority Date: 04/12/1999
  • Status: Active Grant
First Claim
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1. A compact optical system for directing an image signal for viewing by a user, the image signal being generated in accordance with a microdisplay, the system comprising:

  • a first prism positioned proximate to the microdisplay;

    a quarter wave plate positioned proximate to the first prism;

    a reflective lens positioned proximate to the quarter wave plate; and

    a second prism positioned proximate to the first prism;

    wherein the first prism, the quarter wave plate, the reflective lens, and the second prism are arranged such that the image signal enters the first prism, reflects at an air gap between the first prism and the quarter wave plate, reflects at a boundary between the first prism and the second prism, passes through the quarter wave plate a first time, reflects at the reflective lens, passes through the quarter wave plate a second time, passes through the boundary between the first prism and the second prism, and exits the second prism for viewing by the user.

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