Secure viewing of display units using a wavelength filter
First Claim
Patent Images
1. An apparatus for providing secure viewing of a primary image on a display by a viewer comprising:
- means for generating a mask of light of a single wavelength band between said display and said viewer that mixes with said primary image to obscure viewing of said primary image; and
viewing means for use by the viewer for separating said mask of light from said primary image to allow only the primary image to be viewed through the viewing means, so that the viewer only sees the primary image.
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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.
122 Citations
9 Claims
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1. An apparatus for providing secure viewing of a primary image on a display by a viewer comprising:
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means for generating a mask of light of a single wavelength band between said display and said viewer that mixes with said primary image to obscure viewing of said primary image; and viewing means for use by the viewer for separating said mask of light from said primary image to allow only the primary image to be viewed through the viewing means, so that the viewer only sees the primary image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification