Optically compensatory polarizer and liquid-crystal display...

Details Optically compensatory polarizer and liquid-crystal display... Optically compensatory polarizer and liquid-crystal display...

2005-08-09

2005-08-09

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S118000, C349S119000, C349S120000

Reexamination Certificate

active

06927821

ABSTRACT:
An optically compensatory polarizer has a polarizer and an optically compensating film. The polarizer includes an absorption type polarizing element and transparent protective layers provided on opposite sides of the absorption type polarizing element, each of the transparent protective layers exhibiting an in-plane retardation of not larger than 10 nm and a thicknesswise retardation in a range of from 30 to 70 nm. The optically compensating film is laminated on one or each of opposite surfaces of the polarizer so that a slow axis of each optically compensating film crosses an absorption axis of the polarizer perpendicularly, and exhibits an in-plane retardation in a range of from 80 to 200 nm and Nz=(nx−nz)/(nx−ny) in a range of from −0.2 to 0.2 and nx and ny satisfy the relation nx>ny.

REFERENCES:
patent: 5245456 (1993-09-01), Yoshimi et al.
patent: 6320042 (2001-11-01), Michihata et al.
patent: 2003/0049459 (2003-03-01), Ishii et al.
Improvement of Polarizer and Retardation Film for LCDS Aug., 31, 1992.

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