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. 04, 2017
Filed:
Aug. 07, 2014
Sumitomo Chemical Company, Limited, Chuo-ku, Tokyo, JP;
Nobuyuki Hatanaka, Osaka, JP;
Akira Yokota, Osaka, JP;
Tadahiro Kobayashi, Osaka, JP;
Mitsutaka Sase, Niihama, JP;
Yoshifumi Komatsu, Niihama, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Chuo-ku, Tokyo, JP;
Abstract
To provide an optical film excellent in suppression of light leakage in black display. An optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer has an optical property represented by the formula (3), the second phase difference layer has a thickness of 0.2 μm to 2.0 μm, and further, the optical film has optical properties represented by the formulae (1) and (2):(450)/(550)≦1.00  (1)1.00≦(650)/(550)  (2)nx≈ny<nz  (3).