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:
Jul. 24, 2012
Filed:
Mar. 29, 2007
Xiaoliang Joe Zheng, Akron, OH (US);
Frank W. Harris, Boca Raton, FL (US);
Ted Calvin Germroth, Kingsport, TN (US);
Jiaokai Alexander Jing, Uniontown, OH (US);
Dong Zhang, Uniontown, OH (US);
Thauming Kuo, Kingsport, TN (US);
Brian Michael King, Jonesborough, TN (US);
Xiaoliang Joe Zheng, Akron, OH (US);
Frank W. Harris, Boca Raton, FL (US);
Ted Calvin Germroth, Kingsport, TN (US);
Jiaokai Alexander Jing, Uniontown, OH (US);
Dong Zhang, Uniontown, OH (US);
Thauming Kuo, Kingsport, TN (US);
Brian Michael King, Jonesborough, TN (US);
Akron Polymer Systems, Akron, OH (US);
Abstract
A method for controlling positive birefringence in an optical compensation film (positive C-plate) having high positive birefringence throughout the wavelength range 400 nm<λ<800 nm is provided. The method includes selecting polymers with optically anisotropic subunits (OASUs) that exhibit the buttressing effect, wherein the OASUs may be disks, mesogens or aromatic rings substituted with birefringence enhancing substituents. The method further includes processing the polymer by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. These optical compensation films may be used in LCDs, particularly IPS-LCDs.