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. 08, 2025
Filed:
Mar. 31, 2021
Dai Nippon Printing Co., Ltd., Tokyo-to, JP;
Marii Nishikawa, Tokyo-to, JP;
Yasuyuki Oyagi, Tokyo-to, JP;
Yukio Taniguchi, Tokyo-to, JP;
Masahiro Goto, Tokyo-to, JP;
DAI NIPPON PRINTING CO., LTD., Tokyo, JP;
Abstract
A planar light source device includes a light diffusing portion and a light reflecting portion in this order. The light diffusing portion has light transmissivity and light diffusivity. Reflectance of the light reflecting portion with respect to light of a particular wavelength entering at an angle of incidence of 0° is 80% or higher. The reflectance of the light reflecting portion with respect to at least part of light of the particular wavelength entering at an angle of incidence of which an absolute value is greater than 45° is less than 50%.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile