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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10634836 B1

PDFFull Text
Date of Patent:
Apr. 28, 2020

Filed:

Apr. 28, 2015

Circular polarizer for organic el display device having laminated half wavelength plate and quarter wavelength plate, and organic el display device

Applicant:

Nitto Denko Corporation, Ibaraki-shi, Osaka, JP;

Inventors:

Kentarou Takeda, Ibaraki, JP;

Hironori Yaginuma, Ibaraki, JP;

Kazuki Uwada, Ibaraki, JP;

Tadashi Kojima, Ibaraki, JP;

Nao Murakami, Ibaraki, JP;

Assignee:

NITTO DENKO CORPORATION, Ibaraki-shi, Osaka, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

Ryan S Dunning

Int. Cl.
CPC ...
G02B 5/30 (2006.01); H01L 51/52 (2006.01); B32B 27/00 (2006.01); B32B 27/36 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 7/03 (2019.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/28 (2006.01); B32B 7/06 (2019.01); H05B 33/12 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); B32B 7/03 (2019.01); B32B 7/06 (2013.01); B32B 7/12 (2013.01); B32B 27/00 (2013.01); B32B 27/08 (2013.01); B32B 27/286 (2013.01); B32B 27/302 (2013.01); B32B 27/306 (2013.01); B32B 27/308 (2013.01); B32B 27/325 (2013.01); B32B 27/36 (2013.01); B32B 27/365 (2013.01); G02B 5/30 (2013.01); G02B 5/305 (2013.01); H01L 51/5281 (2013.01); B32B 2250/05 (2013.01); B32B 2307/418 (2013.01); B32B 2307/42 (2013.01); B32B 2307/514 (2013.01); B32B 2457/206 (2013.01); H05B 33/12 (2013.01);
Abstract

There is provided a circularly polarizing plate for an organic EL display apparatus that is excellent in productivity, is prevented from warping, and can achieve an excellent tint. An elongated circularly polarizing plate for an organic EL display apparatus according to an embodiment of the present invention includes in the following order: an elongated polarizer having an absorption axis in a longitudinal direction thereof; an elongated first retardation layer functioning as a λ/2 plate; and an elongated second retardation layer functioning as a λ/4 plate. An angle formed between the absorption axis of the elongated polarizer and a slow axis of the elongated first retardation layer is front 15° to 30°; and the absorption axis of the elongated polarizer and a slow axis of the elongated second retardation layer are substantially perpendicular to each other.

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