Security document including a laserizable layer and a pattern for illuminating in order to color a grayscale image, and corresponding fabrication and reading methods
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United States of America Patent
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Oct 6, 2020
Grant Date -
Feb 22, 2018
app pub date -
Aug 18, 2017
filing date -
Aug 19, 2016
priority date (Note) -
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Abstract
A security document may include a laserizable first layer including a grayscale image formed by laserizing; a color pattern that is in alignment with the grayscale image; and a second layer arranged between the first layer and the pattern, such that the first layer is above the second layer, and the pattern is below the second layer. The second layer may be more opaque than the first layer, such that when observing the security document from the top, the grayscale image appears to be colored by the color pattern only when the bottom of the security document is being illuminated.
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