Low color shift polarizer assembly, and back light units and...

Details Low color shift polarizer assembly, and back light units and... Low color shift polarizer assembly, and back light units and...

2009-04-30

2011-11-08

Stahl, Mike (Department: 2874)

Liquid crystal cells, elements and systems

Liquid crystal optical element

Passive liquid crystal polarizer

C349S096000, C349S098000, C349S162000

Reexamination Certificate

active

08054442

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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