Display for advanced research and training (DART) for use in a flight simulator and the like

• US 5,137,450 A
• Filed: 11/05/1990
• Issued: 08/11/1992
• Est. Priority Date: 11/05/1990
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: The United States of America As Represented By The Secretary of Agriculture
• Inventors: Thomas, Melvin L.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Cheng, Joe H.
• Application Number:
  US07/609,295
• Time in Patent Office: 645 Days
• Field of Search: 434/23, 434/24, 434/29, 434/30, 434/35, 434/38, 434/43, 434/44, 434/219, 434/220, 434/322, 434/336, 434/350, 434/365, 434/372, 273/434, 273/85 G, 273/DIG. 28, 358/93, 358/104, 358/229, 358/241, 358/254, 364/578
• 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

A wrap-around display system for presenting out-the-window visual imagery in a flight simulator is disclosed. Eight identically pentagon-shaped translucent rear-projection screens are joined together at their edges to form a partial dodecahedron. Each video projector is mounted outside the partial dodecahedron to direct, through a mounted mirror-folded beam path, an appropriate simulator image to the rear of a pentagon screen. A simulator pilot views the simulated image from inside the partial dodecahedron. Also disclosed is an apparatus for switching eight video signals among six video channels by monitoring simulator head movement to switch video signals to the screen, or window, then being viewed. Further disclosed is an apparatus for providing geometrically correct separate images to two simulator crewmembers. Each field of an interlaced raster display is a display for a separate crewmember design eye-point. Two liquid crystal controlled glasses are worn one each by each crewmember. The glasses lens are separately switched on and off in synchronization with the two video fields so that each crewmember sees the geometrically correct view for his or her design eye-point.

Claims

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

(a) a plurality of flat rear-projections 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 a design eye-point for the intended simulator pilot; and

,

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

2. The compact visual display system according to claim 1, further comprising a plurality of mirrors positioned one each between each projector and a corresponding rear-projection screen, wherein the video beam path for each video projector to a rear-projection screen will be folded so that the video projectors can be positioned closer to the partial dodecahedron enclosure than otherwise.

3. The compact visual display system according to claim 1, further comprising:

(a) means for generating a plurality of video images for transmitting to the video projectors, one video image for one projector, the video image generating means including means for transmitting video images over video channels to the video projectors, wherein there are fewer video channels than video images;

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

,

(c) means for switching transmission of video images among available video channels according to the determined head position of the intended simulator pilot.

4. The compact visual display system according to claim 1, further comprising:

(a) means for generating video images simulating a view about the simulator vehicle form said design eye-point, wherein the video image generating means further includes means for generating alternating video images simulating views about the simulator vehicle from the design eye-point of an intended simulator pilot positioned at correspondingly alternating positions inside the partial dodecahedron enclosure, and wherein the video image generating means further includes means for producing an interlaced video signal comprising alternating interlaced video fields, each pair of alternating fields maiking a video frame, for transmitting to a video projector, wherein each alternating field displays a corresponding alternating video image from the video image generating means;

(b) eyewear means for wear by an intended simulator pilot, wherein the eyewear means include means for rapidly switching transmission through the eyewear means on and off; and

,

(c) means for controlling at least one of the video image generating means and the eyewear means to synchronize the eyewear means with one of the alternating fields so that the intended simulator pilot will see only one of the alternating generated video images simulating views about the simulator vehicle form alternating design eye-points.

5. The compact visual display system according to claim 1, further comprising means for generating a plurality of video images for transmitting to the video projectors, one video image for one projector, wherein one of the video images includes an image of a heads-up display.