Optical element, condensing backlight system and liquid...

Liquid crystal cells – elements and systems – Liquid crystal optical element – Passive liquid crystal polarizer

Reexamination Certificate

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C349S196000

Reexamination Certificate

active

07446848

ABSTRACT:
An optical element of the invention comprises at least two laminated circular-polarization-type-reflection polarizers (a) whose wavelength bands for selective reflection of polarized light overlap one another, whereinthe at least two circular-polarization-type-reflection polarizers (a) each have a side capable of selectively reflecting a relatively short wavelength in the wavelength bands for selective reflection, andthe sides of said at least two circular-polarization-type-reflection polarizers (a) capable of selectively reflecting the relatively short wavelength are arranged opposite to each other. The optical element condenses or collimates incident light from a light source and can control transmission of light at large incident angles relative to the normal direction, increase front brightness and reduce coloration.

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International Preliminary Report on Patentability of Corresponding International Application No. PCT/JP2004/005381 mailed May 4, 2006.
Office Action mailed Aug. 29, 2008 in Corresponding Japanese Patent Application No. 2003-179408.

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