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. 03, 2018
Filed:
Jul. 21, 2016
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Yasuhisa Inada, Osaka, JP;
Taku Hirasawa, Kyoto, JP;
Mitsuru Nitta, Kyoto, JP;
Akira Hashiya, Osaka, JP;
Takeyuki Yamaki, Nara, JP;
Abstract
A light-emitting device includes a photoluminescent layer and a light-transmissive layer located on the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a submicron structure having at least projections or recesses arranged perpendicular to the thickness direction of the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a light emitting surface. The first light has a wavelength λin air. A distance Dbetween adjacent projections or recesses and a refractive index nof the photoluminescent layer for the first light satisfy λ/n<D<λ. A thickness of the photoluminescent layer, the refractive index n, and the distance Dare set to limit a directional angle of the first light emitted from the light emitting surface.