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:
Feb. 27, 2018
Filed:
Jul. 12, 2013
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Takeshi Morinaka, Yokohama, JP;
Kazunori Mukunoki, Yokohama, JP;
Toshiaki Hattori, Yokohama, JP;
Yusuke Kurita, Yokohama, JP;
Naoko Yamada, Yokohama, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A light extraction film for EL elements enables a surface light emitting body to have a good balance between suppression of emission angle dependence of the wavelength of emitted light and improvement of light extraction efficiency and luminance in the normal direction. A surface light emitting body has improved light extraction efficiency and luminance in the normal direction, while being suppressed in emission angle dependence of the wavelength of emitted light. A light extraction film for EL elements comprises a recessed and projected structure having a plurality of spherical projections, each containing a resin and fine particles added into the resin. The content of the fine particles in the spherical projections is 22-55% by mass, and the average maximum diameter (A) of the bottom portions of the spherical projections and the volume average particle diameter (P) of the fine particles satisfy the following mathematical formula (1).≧5  (1)