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.:
Date of Patent:
Oct. 25, 2005
Filed:
Jul. 22, 2003
Satoru Kawahara, Ibaraki, JP;
Naoki Takahashi, Ibaraki, JP;
Hironori Motomura, Ibaraki, JP;
Ikuo Kawamoto, Ibaraki, JP;
Satoru Kawahara, Ibaraki, JP;
Naoki Takahashi, Ibaraki, JP;
Hironori Motomura, Ibaraki, JP;
Ikuo Kawamoto, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki, JP;
Abstract
An optical film in which a function of a brightness enhancement film is maintained and variations in brightness and chromaticity within a film plane are suppressed is provided. An optical film is a laminate of an absorptive dichroic polarizing plate and a brightness enhancement film. A maximum chromaticity difference Δxy(max) of in-plane transmitted light is 0.008 or smaller after the optical film is attached to a glass plate and allowed to stand at 70° C. for 120 hours. The brightness enhancement film includes a layer having a circularly polarized light separating function, and a quarter wavelength plate. The quarter wavelength plate is a film showing an in-plane retardation (Δnd) satisfying Δnd(450 nm)/Δnd(550 nm)<1.02 or a film containing a polymer having a photoelastic coefficient of 40×10m/N or smaller.