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:
Oct. 28, 2014
Filed:
Feb. 29, 2012
Hajime Takeuchi, Yokohama, JP;
Ryo Sakai, Yokohama, JP;
Tsutomu Ishii, Yokohama, JP;
Yasumasa Ooya, Chigasaki, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Hajime Takeuchi, Yokohama, JP;
Ryo Sakai, Yokohama, JP;
Tsutomu Ishii, Yokohama, JP;
Yasumasa Ooya, Chigasaki, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-shi, JP;
Abstract
Certain embodiments provide a white LED for a backlight of a liquid crystal display device, which comprises an ultraviolet (or violet) light emitting element and a phosphor layer that contains a green phosphor selected from trivalent cerium- and terbium-activated rare earth borate phosphors, a blue phosphor selected from divalent europium-activated halophosphate phosphors and divalent europium-activated aluminate phosphors, and a red phosphor selected from europium-activated lanthanum oxysulfide phosphors and europium-activated yttrium oxysulfide phosphors as the contained amounts of the respective phosphors relative to the total amount of the phosphors as follows: 35-50% by weight of the green phosphor content; 50-70% by weight of the blue phosphor content; and 1-10% by weight of the red phosphor content.