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:
Dec. 16, 2008
Filed:
Sep. 13, 2004
Shuuji Yano, Ibaraki, JP;
Ryouji Kinoshita, Ibaraki, JP;
Masayuki Kawai, Ibaraki, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
An optical film() of the invention comprises a polarizing plate() and plural retardation films() so that an absorption axis of the polarizing plate() is perpendicular or parallel to slow axes of the plural retardation films() and the slow axes of the plural retardation films() are parallel to one another. An Nz value expressed by Nz=(nx−nz)/(nx−ny) is in the range of from 0.15 to 0.85 and an in-plane retardation Reexpressed by Re=(nx−ny)×dis in the range of from 200 to 350 nm, where in each of the plural retardation films, a direction along with the refractive index in the film plane is maximum is defined as the X-axis, a direction perpendicular to the X-axis as the Y-axis, the thickness direction of the film as the Z-axis, and where refractive indices in each axial direction are defined as nx, ny, and nz, respectively, and the thickness of the film as d(nm). The optical film may realize an easily viewable display with high contrast ratio in a wide range.