Low color shift polarizer assembly, and back light units and liquid crystal displays containing the same
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United States of America Patent
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Nov 8, 2011
Grant Date -
Nov 5, 2009
app pub date -
Apr 30, 2009
filing date -
May 1, 2008
priority date (Note) -
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Abstract
A low color shift polarizer assembly is provided, comprising a cholesteric liquid crystal film with a plurality of very tiny grooves which are irregularly dispersed on a surface of the cholesteric liquid crystal film. The selective reflective wavelength range of the cholesteric liquid crystal film has a long wavelength boundary ≧700 nm and a short wavelength boundary ≦420 nm. A quarter wavelength retardation plate can be disposed on the cholesteric liquid crystal film to build up the final low color shift polarizer assembly. The polarizer assembly can be combined with a backlight unit and further with a liquid crystal display to provide low color shift at large viewing angles and high brightness.
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