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:
Apr. 17, 2007
Filed:
Sep. 29, 2003
Takuya Hamada, Chiba, JP;
Masahiro Kato, Chiba, JP;
Tomohiro Yamada, Chiba, JP;
Kazunori Kitagawa, Chiba, JP;
Hitoshi Toki, Chiba, JP;
Takuya Hamada, Chiba, JP;
Masahiro Kato, Chiba, JP;
Tomohiro Yamada, Chiba, JP;
Kazunori Kitagawa, Chiba, JP;
Hitoshi Toki, Chiba, JP;
Futaba Corporation, Chiba, JP;
Abstract
In a fluorescent display device wherein light is emitted by impinging a low speed electron beam on a phosphor layer formed on an anode, the phosphor layer comprises a compound containing W and/or a compound containing P, K and/or Na. The compound containing P, K and/or Na may be a compound selected from the group consisting of KPO, POand NaSiO, the compound being added in an amount of 0.01 to 10.00 wt % to the phosphor layer, to provide a higher luminance residual ratio and a higher high temperature exposure characteristic than those of a convention fluorescent display device.