Polarising liquid crystal device for security documents
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United States of America Patent
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Issued Date -
Jun 1, 2006
app pub date -
Jun 12, 2003
filing date -
Jun 18, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A polarizing liquid crystal device comprises a substrate, at least one photo-alignment layer which is uniformly aligned with a polarized light source and a nematic liquid crystal later applied to the photo-alignment later. A latent image which is viewable under cross-polarizers is formed by the photo-alignment layer and the liquid crystal later without the aid of a mask by a variable printing or laser writing process.
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