Claims
- 1. An apparatus for displaying an image projected by an image source, comprising:
an imaging screen; a linear reflecting polarizer positioned in parallel with the imaging screen and substantially coextensive with the imaging screen; and an optical image path which reaches the linear reflecting polarizer twice on its way to the imaging screen, the linear reflecting polarizer at one time reflecting the image traveling along the optical path away from the imaging screen and at a different time transmitting the image onto the imaging screen.
- 2. The apparatus according to claim 1, further comprising:
a retarder positioned along the optical path, wherein the retarder rotates the director of the reflected image light 90° before passing the reflected image light passing through the linear reflecting polarizer.
- 3. The apparatus according to claim 2, further comprising:
a retarder positioned such that the optical path reaches the retarder twice after the image is reflected from the linear reflecting polarizer, the retarder having an effective retardation of ½ wavelength for the two passes through the retarder.
- 4. A method for displaying images in a projection display system, the method comprising:
projecting an image toward an imaging screen; reflecting the image from a linear reflecting polarizer positioned in parallel and substantially coextensive with the imaging screen; and thereafter reflecting the image back toward the imaging screen; and rotating the director of the image light 90°; and passing the image through the linear reflecting polarizer onto an imaging surface.
- 5. The method of claim 4, wherein rotating the director of the image light 90° comprises twice passing the image through a retarder, the retarder having an effective retardation of ½ wavelength for the two passes through the retarder.
Parent Case Info
[0001] This application is a continuation-in-part of U.S. application Ser. No. 08/581,108.
Continuations (2)
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Number |
Date |
Country |
Parent |
09715057 |
Nov 2000 |
US |
Child |
10043228 |
Jan 2002 |
US |
Parent |
08767967 |
Dec 1996 |
US |
Child |
09715057 |
Nov 2000 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08581108 |
Dec 1995 |
US |
Child |
08767967 |
Dec 1996 |
US |