Waveguide virtual image display

• US 5,224,198 A
• Filed: 09/30/1991
• Issued: 06/29/1993
• Est. Priority Date: 09/30/1991
• Status: Expired due to Term

• Current Assignee: Ryo Holdings, LLC (Intellectual Ventures LLC)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Jachimowicz, Karen E., Richard, Fred V., Nelson, Ronald J.
• Primary Examiner(s): Healy, Brian
• Assistant Examiner(s): BARNS, STEPHEN
• Application Number:
  US07/767,180
• Time in Patent Office: 638 Days
• Field of Search: 359/13, 359/15, 359/572, 359/566, 359/630, 385/133, 385/146, 385/147
• US Class Current: 385/133
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/006 to produce indicia, symbols, texts or the like
• CPC Class Codes: G02C 9/00 Attaching auxiliary optical parts auxiliary optical parts per se G02C7/08 - G02C7/16
• CPC Class Codes: G09F 13/0422 Reflectors
• CPC Class Codes: G09F 13/14 Arrangements of reflectors therein
• CPC Class Codes: G09F 2013/145 curved reflectors
• CPC Class Codes: G09F 2013/1813 provided with a coating showing a pattern of dots of variable density
• CPC Class Codes: G09F 2013/1818 provided with a coating of variable thickness

Abstract

A waveguide virtual image display including image generation apparatus providing a real image at an inlet of an optical waveguide. The real image being reflected a plurality of times within the optical waveguide by diffractive optical elements that magnify and filter the real image and produce a virtual image at a viewing aperture. The display is mounted on an eyeglasses frame for hands-free viewing.

Claims

1. A waveguide virtual image display having a viewing aperture, the display comprising:

image generation apparatus for providing a real image;

an optical waveguide formed of optical quality plastic having an inlet positioned adjacent the apparatus for receiving a real image provided thereby and an outlet spaced from the inlet and defining the viewing aperture, the optical waveguide defining an optical path therethrough from the inlet to the outlet and constructed to transmit an image from the inlet to the outlet; and

optical means positioned along the optical waveguide at predetermined areas in the optical path for magnifying a real image supplied at the inlet and providing a magnified virtual image at the outlet, the optical means including a diffractive optical element formed of a soft photopolymer film positioned at a surface of the optical waveguide.

2. A waveguide virtual image display as claimed in claim 1 wherein the optical means includes a lens formed integrally with the optical waveguide as a portion of a side of the optical waveguide.

3. A waveguide virtual image display having a viewing aperture, the display comprising:

image generation apparatus for providing a real image;

an optical waveguide having a real image inlet positioned adjacent the semiconductor apparatus for receiving a real image provided by the semiconductor apparatus and a virtual image outlet spaced from the real image inlet and defining the viewing aperture, the optical waveguide including a plurality of sides with the inlet positioned to direct incoming light waves angularly toward a first of the plurality of sides, resulting in a plurality of reflections between the plurality of sides, and defining an optical path through the optical waveguide from the real image inlet to the virtual image outlet, the reflections defining predetermined areas along the waveguide; and

optical means positioned along the optical waveguide at at least some of the predetermined areas in the optical path for magnifying a real image supplied at the real image inlet and providing a magnified virtual image at the virtual image outlet, the optical means including a plurality of diffractive optical elements.

4. A waveguide virtual image display as claimed in claim 3 wherein the plurality of diffractive optical elements includes diffractive lenses.

5. A waveguide virtual image display as claimed in claim 3 wherein the plurality of diffractive optical elements includes an aberration correction element.

6. A waveguide virtual image display as claimed in claim 3 wherein the plurality of diffractive optical elements includes diffractive Fourier lenses for diffracting unwanted portions of the reflected image onto areas adjacent the predetermined areas and light absorption means positioned at areas adjacent the predetermined areas for absorbing the unwanted portions.

7. A waveguide virtual image display as claimed in claim 3 wherein the image generation apparatus includes a semiconductor chip.

8. A waveguide virtual image display having a viewing aperture, the display comprising:

image generation apparatus for providing a real image;

an optical waveguide having an inlet positioned adjacent the apparatus for receiving a real image provided thereby and an outlet spaced from the inlet and defining the viewing aperture, the optical waveguide defining an optical path therethrough from the inlet to the outlet and constructed to transmit an image from the inlet to the outlet; and

optical means positioned along the optical waveguide at predetermined areas in the optical path for magnifying a real image supplied at the inlet and providing a magnified virtual image at the outlet, the optical means including a diffractive optical element.

9. A waveguide virtual image display as claimed in claim 8 wherein the diffractive optical element includes a diffractive lens.

10. A waveguide virtual image display as claimed in claim 8 wherein the diffractive optical element includes a diffractive filter.

11. A waveguide virtual image display as claimed in claim 8 wherein the apparatus providing the real image is formed in a semiconductor chip.

12. A waveguide virtual image display having a viewing aperture, the display comprising:

image generation apparatus for providing a real image;

an optical waveguide having a real image inlet positioned adjacent the semiconductor apparatus for receiving a real image provided by the semiconductor apparatus and a virtual image outlet spaced from the real image inlet and defining the viewing aperture, the optical waveguide including a plurality of sides with the inlet positioned to direct incoming light waves angularly toward a first of the plurality of sides, resulting in a plurality of reflections between the plurality of sides, and defining an optical path through the optical waveguide from the real image inlet to the virtual image outlet, the reflections defining predetermined areas along the waveguide; and

optical means positioned along the optical waveguide at at least some of the predetermined areas in the optical path for magnifying a real image supplied at the real image inlet and providing a magnified virtual image at the virtual image outlet, the optical means including a refractive optical element and a diffractive optical element.