Display filter arrangements
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United States of America Patent
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-
Dec 7, 1993
Grant Date -
N/A
app pub date -
Jun 12, 1992
filing date -
Jun 25, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A display especially for viewing by a night-vision aid has an array of LED's which emit green light. A dichroic filter is located in front of the display and transmits radiation at the peak emission of the diodes but reflects radiation in the range to which the night-vision aid is sensitive. A bandpass filter located in front of the dichroic filter prevents transmission of longer wavelengths, and a circularly polarizing filter in front of the bandpass filter prevents transmission of radiation reflected specularly from surfaces behind it.
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