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:
Jan. 28, 2025
Filed:
May. 28, 2020
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Seiichi Isojima, Okayama, JP;
Takashi Kuroda, Moriya, JP;
DAI NIPPON PRINTING CO., LTD., Tokyo, JP;
Abstract
An optical plastic film can suppress rainbow unevenness when viewed with naked eyes and blackout when viewed with polarized sunglasses without high in-plane retardation. The film has an average of in-plane retardations of 600 nm or less and satisfies: when a sample with a size of 50 mm in length×50 mm in width is cut out of the film, slow axis directions are measured at a total of five points including four points 10 mm advanced from the four corners of the sample toward the center and the center of the sample, and angles formed by any one side of the sample with the slow axis directions at the measurement points are respectively defined as D1 to D5, the difference between the maximum value and the minimum value of D1 to D5 is 5.0 degrees or more.