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:
Aug. 24, 2021
Filed:
Feb. 11, 2020
3m Innovative Properties Company, St. Paul, MN (US);
Timothy J. Nevitt, Red Wing, MN (US);
Carl A. Stover, St. Paul, MN (US);
Gilles J. Benoit, Minneapolis, MN (US);
Kristopher J. Derks, Woodbury, MN (US);
Zhaohui Yang, North Oaks, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Multilayer optical film reflective polarizers previously considered to have excessive off-axis color can provide adequate performance in an LC display in an 'on-glass' configuration, laminated to a back absorbing polarizer of the display, without any light diffusing layer or air gap in such laminate. The reflective polarizer is a tentered-one-packet (TOP) multilayer film, having only one packet of microlayers, and oriented using a standard tenter such that birefringent microlayers in the film are biaxially birefringent. The thickness profile of optical repeat units (ORUs) in the microlayer packet is tailored to avoid excessive perceived color at normal and oblique angles. Color at high oblique angles in the white state of the display is reduced by positioning thicker ORUs closer to the absorbing polarizer, and by ensuring that, with regard to a boxcar average of the ORU thickness profile, the average slope from an ORU(600) to an ORU(645) does not exceed 1.8 times the average slope from an ORU(450) to the ORU(600).