Retardation film, polarizing element, liquid crystal panel,...

Details Retardation film, polarizing element, liquid crystal panel,... Retardation film, polarizing element, liquid crystal panel,...

2006-02-01

2009-12-01

Sample, David R (Department: 1794)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With viewing layer of specified composition

C349S118000

Reexamination Certificate

active

07625612

ABSTRACT:
There is provided a retardation film including a stretched film of a polymer film having an absolute value of photoelastic coefficient (m2/N) of 50×10−12or less measured by using light of a wavelength of 550 nm at 23° C., which satisfies the following expressions (1) and (2):in-line-formulae description="In-line Formulae" end="lead"?Re[450]<Re[550]<Re[650]  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Rth[550]<Re[550]  (2).in-line-formulae description="In-line Formulae" end="tail"?In the expressions (1) and (2): Re[450], Re[550], and Re[650] respectively represent in-plane retardation values measured by using light of wavelengths of 450 nm, 550 nm, and 650 nm at 23° C.; and Rth[550] represents a thickness direction retardation value measured by using light of a wavelength of 550 nm at 23° C.

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Machine translation of Higuchi et al. (JP 2005-091900).
Chinese Office Action dated Apr. 6, 2007, Application No. 2006100032934.

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