Light weight binocular helmet visor display

• US 5,198,928 A
• Filed: 06/26/1991
• Issued: 03/30/1993
• Est. Priority Date: 06/26/1991
• Status: Expired due to Fees

• Current Assignee: Hughes Aircraft Company (Rtx Corporation)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Chauvin, Dewey J.
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/721,724
• Time in Patent Office: 643 Days
• Field of Search: 359/73, 359/464, 359/465, 359/487, 359/488, 359/495, 359/496, 359/497, 359/630, 359/409, 353/7, 353/8, 353/20
• US Class Current: 359/465
• CPC Class Codes: G02B 2027/0132 comprising binocular systems
• CPC Class Codes: G02B 2027/0136 with a single image source for both eyes
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: H04N 13/337 using polarisation multiplexing
• CPC Class Codes: H04N 13/339 using spatial multiplexing H04N13/337 takes precedence
• CPC Class Codes: H04N 13/344 with head-mounted left-right displays

Abstract

A binocular, stereoscopic helmet visor display is described, wherein a polarization x-prism is used to separate the left eye imagery from the right eye imagery when each channel has a unique polarization. Separate image sources generate the left and right eye imagery, and the respective left and right image light is passed through polarizers so that the respective left and right image light is of opposite polarizations. The polarized left and right image light is combined through a common optical relay and passed to the x-prism which separates the polarized light, sending the "p" polarized light out one channel to one eye, and the "s" polarized light out the other channel to the other eye. Once the channels are separated, the images are projected to the observer'"'"'s eyes.

Claims

1. A binocular helmet visor display (HVD) for providing the observer with a different image for each eye, comprising:

a first image source means for producing image light which is "p" polarized;

a second image source for producing image light which is "s" polarized;

means for directing said "p" polarized and "s" polarized light onto an input face of a polarization x-prism; and

wherein said x-prism functions as a channel separator to separate said incident "p" and "s" polarized image light into respective right and left eye channels, wherein either the "p" or "s" polarized image light is directed toward the observer'"'"'s left eye, and the other of the "p" or "s" polarized image light is directed toward the observer'"'"'s right eye.

2. The HVD of claim 1 wherein said x-prism comprises four triangular prism elements, characterized in that each prism element has formed on one leg a polarization sensitive coating which predominately reflects the "s" polarization incident light and transmits the "p" polarization light, and on another leg a half wave plate is formed which converts the polarization of the light incident thereon, and wherein said four triangular elements are bonded together with their respective legs joined such that a coating is next to a half-wave plate.

3. The HVD of claim 2 wherein said coating comprises a MacNeille type dielectric coating.

4. The HVD of claim 2 wherein the legs of each triangular prism element which carry said respective coating and plate define a right angle.

5. The HVD of claim 1 wherein said first image source means comprises a first image generator and means for polarizing the light from said first generator as "p" polarized light, and wherein said second image source means comprises a second image generator and means for polarizing the light from said second generator as "s" polarized light, and wherein said means for directing comprises a right angle beamsplitter/combiner.

6. The HVD of claim 1 wherein said first image source means comprises a first image generator for generating unpolarized first image light, said second image source means comprises a second image generator for generating unpolarized second image light, and a right angle polarized beamsplitter for combining and transmitting to said x-prism only the "p" polarized light component of said first image light and only the "s" polarized light component of said second image light.

7. A binocular helmet visor display (HVD) for providing the observer with a different image for each eye, comprising:

a first image source means for producing image light which is "p" polarized;

a second image source for producing image light which is "s" polarized;

means for combining the light from said first and second image sources into a single channel and directing said combined light onto a polarization sensitive channel separator;

said channel separator comprising means for separating the polarized light, sending nearly all th e"p" polarized light to a first eye channel and sending nearly all the "s" polarized light to a second eye channel, wherein said channel separator comprises a polarization x-prism comprising four triangular prism elements, characterized in that each prism element has formed on one leg a polarization sensitive coating which predominately reflects the "s" polarization incident light and transmits the "p" polarization lgiht, and on another leg a half wave plate is formed which converts the polarization of the light incident thereon, and wherein said four triangular elements are bonded together with their respective legs joined such that a coating is next to a half-wave plate; and

means for projecting the respective light in said first eye channel toward a first one of the user'"'"'s eyes and for projecting the respective light in said second eye channel toward a second one of the user'"'"'s eyes.

8. The HVD of claim 7 wherein said coating comprises a MacNeille type dielectric coating.

9. The HVD of claim 7 wherein the legs of each triangular prism element which carry said respective coating and plate define a right angle.

10. The HVD of claim 7 wherein said first image source means comprises a first image generator and means for polarizing the light from said first generator as "p" polarized light, and wherein said second image source means comprises a second image generator and means for polarizing the light from said second generator as "s" polarized light, and wherein said means for combining comprises a right angle beamsplitter/combiner.

11. The HVD of claim 7 wherein said first image source means comprises a first image generator for generating unpolarized first image light, said second image source means comprises a second image generator for generating unpolarized second image light, and said combining means comprises a right angle polarized beamsplitter for combining and transmitting to said channel separator only the "p" polarized light component of said first image light and only the "s" polarized light component of said second image light.