Polarization gratings in mesogenic films
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United States of America Patent
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Apr 6, 2010
Grant Date -
Nov 13, 2008
app pub date -
Feb 28, 2006
filing date -
Mar 1, 2005
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Abstract
A polarization grating comprising a polarization sensitive photo-alignment layer (2) and a liquid crystal composition (3) arranged on said photo-alignment layer is provided. An alignment pattern, corresponding to the polarization pattern of a hologram, is recorded in the photo-alignment layer, and the liquid crystal composition is aligned on the photo-alignment layer. As the origin for the alignment of the liquid crystal composition is a polarization hologram recorded in a photo-alignment layer, an essentially defect-free pattern can be obtained with this approach.
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