Secure viewing of display units using an electronic shutter

Details Secure viewing of display units using an electronic shutter Secure viewing of display units using an electronic shutter

1994-11-21

1997-03-25

Hjerpe, Richard

Computer graphics processing and selective visual display system

Image superposition by optical means

345 4, 380 54, G09G 500

Patent

active

056149204

ABSTRACT:
Apparatus for masking a displayed image by merging it with a second featureless image made of short pulses of light that are introduced into a transparent screen disposed between the display and the viewer. An electronic shutter timed to match the sequence of the masking light pulses separates or blocks the masking image to permit the primary image to be viewed only by the person having the electronic shutter.

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