Secure viewing of display units using a wavelength filter

Details Secure viewing of display units using a wavelength filter Secure viewing of display units using a wavelength filter

1994-11-21

1997-04-08

Hjerpe, Richard

Computer graphics processing and selective visual display system

Image superposition by optical means

345 4, 380 54, G09G 500

Patent

active

056192193

ABSTRACT:
Apparatus for masking a displayed image by merging it with a second featureless image made of a narrow band of wavelengths that is introduced into a transparent screen disposed between the display and the viewer. An absorption filter matched to the wavelength of the masking light separates or blocks the masking image to permit the primary image to be viewed only by the person having the filter.

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