Helmet mounted area of interest (HMAoI) for the display for advanced research and training (DART)

• US 5,320,534 A
• Filed: 08/10/1992
• Issued: 06/14/1994
• Est. Priority Date: 11/05/1990
• Status: Expired due to Fees

• Current Assignee: United States Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Thomas, Melvin L.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Cheng, Joe H.
• Application Number:
  US07/927,574
• Time in Patent Office: 673 Days
• Field of Search: 434/21, 434/24, 434/29, 434/30, 434/35, 434/38, 434/43, 434/44, 434/219, 434/220, 434/307, 434/322, 434/336, 434/350, 434/365, 434/372, 273/85 G, 273/434, 273/DIG. 28, 358/93, 358/104, 358/183, 358/226, 358/229, 358/241, 358/254, 364/424.06, 364/578, 340/705, 345/7-9
• US Class Current: 434/44
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G09B 9/302 the image being transformed by computer processing, e.g. updating the image to correspond to the changing point of view
• CPC Class Codes: G09B 9/307 by helmet-mounted projector or display G09B9/36 takes precedence; optical parts of head-up displays G02B27/01
• CPC Class Codes: G09B 9/32 by projected image G09B9/307, G09B9/36 take precedence
• CPC Class Codes: G09B 9/326 the image being transformed by optical means

Abstract

The Display for Advanced Research and Training (DART), a wrap-around display system for presenting out-the-window visual imagery in a flight simulator, is substantially improved by adding a helmet mounted display of modest field-of-view that displays only an area-of-interest view (HMAoI) The HMAoI display displays a modest field-of-view, high resolution image, according to the head position of a simulator pilot as determined by a helmet mounted position indicator, that replaces the lower resolution view provided by the DART for the same image. The corresponding DART image is not displayed to prevent displaying a confusing view. The remaining DART display provides a peripheral view for a simulator pilot. The imagery provided through the HMAoI may be a two part image comprising a very high resolution central image surrounded by a lower, but still higher than the DART, resolution image.

Claims

1. A compact visual display system for use as part of a vehicle simulator operated by an intended simulator pilot having a design eyepoint comprising:

(a) a plurality of flat rear-projection screens, wherein each screen has the shape of a pentagon, wherein the screens are joined along their edges to make a partial enclosure having the outside shape of a partial dodecahedron, and wherein each rear-projection screen is positioned less that about 3.5 feet across an optically unmodified space from the design eyepoint for the intended simulator pilot;

(b) a plurality of first video projectors for projecting beams of video images, each first video projector mounted outside the partial dodecahedron enclosure and aimed to project its video beam toward a respective rear-projection screen;

(c) a helmet mounted display for wear by the intended simulator pilot, wherein the helmet mounted display focuses its display at the same distance from the design eyepoint as one of the rear-projection screens;

(d) at least one second video projector for projecting a beam of video images through the helmet mounted display to the design eyepoint of the intended simulator pilot;

(e) means for determining the head position of the intended simulator pilot; and

(f) means for generating a plurality of video images for transmitting to the first and second video projectors, wherein the video image generating means provides appropriate images to the second video projector according to the determined head position of the intended simulator pilot, wherein the video image generating means provides an image to the second video projector of higher resolution than shown on the rear-position screens, and wherein the video image generating means modifies the video images sent to the first video projectors to remove on any rear-projection screen the video images being sent to the first video projector.

2. The compact visual display system according to claim 1, wherein the video image generating means blends the video images sent to the first and second video projectors so that the video images sent to the second video projectors blends inconspicuously with the not removed images sent to the first video projectors.

3. A compact visual display system for use as part of a vehicle simulator operated by an intended simulator pilot having a design eyepoint, comprising:

(a) a plurality of flat rear-projection screens, wherein each screen has the shape of a pentagon, wherein the screens are joined along their edges to make a partial enclosure having the outside shape of a partial dodecahedron, and wherein each rear-projection screen is positioned less than about 3.5 feet across an optically unmodified space from the design eyepoint for the intended simulator pilot;

(b) a plurality of first video projectors for projecting beams of video images, each first video projector mounted outside the partial dodecahedron enclosure and aimed to project its video beam toward a respective rear-projection screen;

(c) a helmet mounted display for wear by the intended simulator pilot, wherein the helmet mounted display focuses its display at the same distance from the design eyepoint as one of the rear-projection screens;

(d) at least one second video projector for projecting a beam of video images through the helmet mounted display to the design eyepoint of the intended simulator pilot;

(e) means for determining the head position of the intended simulator pilot; and

,

(f) means for generating a plurality of video images for transmitting to the first and second video projectors, wherein the video image generating means provides appropriate images to the second video projector according to the determined head position of the intended simulator pilot, and wherein the video image generating means modifies the video images sent to the first video projectors to remove on any rear-projection screen the video images being sent to the first video projectors;

(g) wherein the video image generating means provides two images to the second video projector, a first image of higher resolution that the images sent to the first video projectors and a second image of even higher resolution.

4. The compact visual display system according to claim 3, wherein the first image surrounds the second image.

5. A visual display system for use as part of a vehicle simulator operated by an intended simulator pilot having a design eyepoint comprising:

(a) a projection visual display system having at least one projection screen optically positioned at a first distance from the design eyepoint for the intended simulator pilot; and

(b) a helmet mounted display for wear by the intended simulator pilot, wherein the helmet mounted display focuses its display at the first distance form the design eyepoint;

(c) means for determining the head position of the intended simulator pilot;

(d) means for providing to the helmet mounted display appropriate video images according to the determined head position of the intended simulator pilot, wherein the video image providing means provides an image to the helmet mounted display of higher resolution than shown on the projection screens;

(e) means for removing from the video images shown on the projection screen the video images provided to the helmet mounted display.

6. The visual display system according to claim 5, wherein the video images provided to the helmet mounted display are blended with the not removed images shown on the projection screens.

7. A visual display system for use as part of a vehicle simulator operated by an intended simulator pilot having a design eyepoint, comprising:

(a) a projection visual display system having at least one projection screen optically positioned at a first distance from the design eyepoint for the intended simulator pilot;

(b) a helmet mounted display for wear by the intended simulator pilot, wherein the helmet mounted display focuses its display at the first distance from the design eyepoint;

(c) means for determining the head position of the intended simulator pilot;

(d) means for providing to the helmet mounted display appropriate video images according to the determined head position of the intended simulator pilot;

(e) means for removing from the video images shown on the projection screen the video images provided to the helmet mounted display;

(f) wherein the video image providing means for the helmet mounted display provides two images to the helmet provided display, a first image of higher resolution than shown on the projection screens and a second image of even higher resolution.

8. The visual display system according to claim 7, wherein the first image surrounds the second image.