A hidden image security device and method
A safety device and safety technology, applied in decorative art, special patterns, patterns characterized by light projection effects, etc., can solve problems such as difficulty in producing relief structures and formation of liquid crystal layers
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[0081] For purposes of the following discussion, the drawings should be considered illustrative and not to scale unless otherwise indicated. The figures show a simplified depiction of the described embodiments.
[0082] A "polarization filter" as used herein may be selected from: a structured polarizer as described in AU 2011100315; a liquid crystal polarizer as described in AU 2012100299; or any other suitable polarizer. An "integrating polarizer" is a polarizer that is formed as part of the security device, such as for example on one side of the security device.
[0083] "Incident light" is light from a light source incident on one side of the substrate, and is generally considered to be unpolarized white light (eg, like originating from an incandescent or fluorescent light source), unless otherwise stated.
[0084] A "visual effect" is an image, pattern, or other visually identifiable effect. Visual effects can be hidden visual effects that are only visible under certain ...
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