Computer graphics processing and selective visual display system – Image superposition by optical means – Operator body-mounted heads-up display
Reexamination Certificate
1998-10-30
2001-06-26
Hjerpe, Richard (Department: 2774)
Computer graphics processing and selective visual display system
Image superposition by optical means
Operator body-mounted heads-up display
C345S007000, C359S630000, C359S631000
Reexamination Certificate
active
06252565
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to video displays wherein electronic video signals in standard TV format are converted into visible images for viewing by human eyes.
2. Description of Prior Art
The information gathered by state of the art sensors such as video cameras, near infra-red cameras, light intensification devices and far-infrared systems like the Forward Looking Infra-Red detector (FLIR) must be presented to the user by means of visible display. A particularly convenient holder for these displays is the head mounted type, resembling ordinary reading glasses or goggles; that leave the user's head, hands and in some cases his eyes free for other tasks. Conventional displays, whether Cathode Ray Tube (CRT), Flat Panel (including Liquid Crystal Displays, Light Emitting Diodes, etc.) or laser projectors, all produce real images on a screen which must be viewed either directly by the eye (such as the case in viewing a conventional CRT computer monitor) or through some form of magnifying eyepiece lens (such as the case of viewing a miniature video recorder display). This arrangement requires considerable space, which is at a premium in head mounted displays.
SUMMARY OF THE INVENTION
According to the invention, space is conserved for head-mounted mounted display applications by using a new concept of direct retinal imaging for relaying video signal information to a human observer. Retinal imaging is distinguished from the above mentioned conventional display technology in that the only real video image is the one formed on the retina itself, e.g., there is no intermediate real image. This is achieved by combining optical intensity modulation and a serial scanning technique which can scan a single laser beam to create a desired video raster image. The laser beam is scanned directly into the pupil of the observer's eye, and there is no other intermediate viewable image. The difficulty in this approach is the design of an optical delivery system which is consistent with the available methods of scanning and the requirements for total field of view and eye relief distance, all in a lightweight package.
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Bashore Alain L.
Eisen Alexander
Hjerpe Richard
Holford John E.
Lee Milton W.
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