Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kazunori Kitagawa0
Tomohiro Yamada0
Takuya Hamada0
Hitoshi Toki0
Masahiro Kato0
Date of Patent
April 17, 2007
0Patent Application Number
106716260
Date Filed
September 29, 2003
0Patent Primary Examiner
Patent 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 K3PO4, P2O5 and Na2SiO3, 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.
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