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:
Apr. 10, 2018
Filed:
Jan. 24, 2013
Akron Polymer Systems, Inc., Akron, OH (US);
Bin Wang, Kingsport, TN (US);
Thauming Kuo, Kingsport, TN (US);
Ted Germroth, Kingsport, TN (US);
Dong Zhang, Uniontown, OH (US);
Doug McWilliams, Piney Flats, TN (US);
Frank Harris, Boca Raton, FL (US);
Jiaokai Jing, Uniontown, OH (US);
Xiaoliang Zheng, Hudson, OH (US);
Akron Polymer Systems, Inc., Akron, OH (US);
Abstract
An optical compensation film is disclosed herein, which is made by uniaxially or biaxially stretching of a multilayer film including a first polymer film having a refractive index profile satisfying the equations of (n+n)/2≥nand |n−n|<0.005 and a second polymer film having a refractive index profile satisfying the equations of (n+n)/2<nand |n−n|<0.005, wherein nand nrepresent in-plane refractive indices and nthe thickness-direction refractive index of the films, and wherein said optical compensation film has a positive in-plane retardation that satisfies the relations of 0.7<R/R<1 and 1<R/R<1.25, wherein R, R, and Rare in-plane retardations at the light wavelengths of 450 nm, 550 nm, and 650 nm respectively.