Information display system having transparent holographic optical element
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United States of America Patent
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Mar 1, 1994
Grant Date -
N/A
app pub date -
Sep 27, 1991
filing date -
Sep 27, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An information display system has a display screen which is substantially transparent to a selected band of wavelengths of light and can be mounted on a window. A projector projects an image of light of the wavelengths to which the display screen responds onto the screen to reflect or transmit the selected wavelengths of light from the screen. The screen is formed as a holographic optical element which reflects the light such that an observer is able to see the projected image from the display screen only if his eyes are within a predetermined area, while observers outside of the area see only a substantially transparent display screen on the window.
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