Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-08-30
1992-08-04
Gregory, Bernarr E.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
340702, 340765, 340784, G02F 113
Patent
active
H00010960
ABSTRACT:
A solid state sunlight readable, night vision compatible display device in which a legend, of which at least a portion is translucent, is back lit by a fluorescent coating on an electroluminescent light source. Under high ambient light conditions the fluorescent coating is energized primarily by ambient light transmitted through the legend. Under low ambient light conditions the fluorescent coating is energized primarily by light from the electroluminescent light source. A solid state shutter whose operation is coordinated with that of the light source is provided in front of the legent to prevent undesired message displays when the display device is "off".
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Lawrence E. Tannas, Flat-Panel Display and CRT, 1985, pp. 12-13 and 16-17.
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