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:
Mar. 25, 2025
Filed:
May. 08, 2024
Sharp Display Technology Corporation, Kameyama, JP;
Satsuki Hagihara, Kameyama, JP;
Kazuhiko Negoro, Kameyama, JP;
Mayumi Hori, Kameyama, JP;
Kenichi Iwamoto, Kameyama, JP;
Sharp Display Technology Corporation, Kameyama, JP;
Abstract
A backlight apparatus includes an LED substrate having a principal surface over which a plurality of light-emitting elements that emit excitation light are arrayed, a phosphor layer containing a phosphor that emits fluorescence upon receiving the excitation light, a wavelength-selective reflecting layer disposed between the phosphor layer and the LED substrate, and a louver film disposed between the wavelength-selective reflecting layer and the LED substrate and having a plurality of louvers. The wavelength-selective reflecting layer has different transmittances according to wavelengths and/or angles of incidence of light falling thereon. The louver film blocks the fluorescence and the excitation light falling thereon at an angle greater than or equal to a first angle and smaller than 90 degrees with respect to a direction normal to a film surface of the louver film.