Optical multilayer

Details Optical multilayer Optical multilayer

2007-05-01

2007-05-01

Dye, Rena (Department: 1774)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S001100, C428S001310, C428S001330, C428S001550, C428S220000, C349S002000, C349S096000, C349S127000

Reexamination Certificate

active

10694547

ABSTRACT:
Disclosed is an optical multilayer comprising a polymeric substrate having a non-zero out-of plane birefringence and an amorphous polymeric overlayer that comprises an amorphous polymer having a Tg value above 160° C. and having the sign of its out-of-plane birefringence opposite to that of the polymeric substrate so as to provide a total out-of-plane phase retardation of said optical multilayer of between −30 nm and 30 nm for wavelengths of light between 400 and 700 nm.

REFERENCES:
patent: 6261649 (2001-07-01), Takagi et al.
patent: 6937310 (2005-08-01), Elman et al.
patent: 2003/0174399 (2003-09-01), Kusumoto et al.
patent: 1 118 885 (2001-07-01), None
Fuming Li, et al, “Polyimide Films as Negative Birefringent Compensators for Normally White Twisted Nematic Liquid Crystal Displays”, POLYMER, vol. 37, No. 23, 1996, pp. 5321-5325.

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