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:
Jan. 13, 2009
Filed:
Apr. 21, 2004
Masaki Aoki, Osaka, JP;
Yumi Kondo, Osaka, JP;
Kazuhiko Sugimoto, Kyoto, JP;
Hiroshi Setoguchi, Osaka, JP;
Junichi Hibino, Kyoto, JP;
Yoshinori Tanaka, Osaka, JP;
Teppei Hosokawa, Osaka, JP;
Masaki Aoki, Osaka, JP;
Yumi Kondo, Osaka, JP;
Kazuhiko Sugimoto, Kyoto, JP;
Hiroshi Setoguchi, Osaka, JP;
Junichi Hibino, Kyoto, JP;
Yoshinori Tanaka, Osaka, JP;
Teppei Hosokawa, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Disclosed here is a plasma display unit that employs phosphors having an amount of charge controlled close to zero, by which degradation in luminance, color temperature, and charge characteristics can be minimized. A phosphor bearing positive or negative charge is coated with a compound for controlling the amount of charge of the phosphor through a strong chemical bonding, whereby the amount of charge of a phosphor can be suppressed within ±0.01 μC/g. Controlling the amount of charge of phosphors close to zero can keep impurity gases away from the phosphor particle when the panel is in operation, suppressing problems critical to driving a plasma display unit, such as luminance degradation of phosphors, improper alignment of color in panel operation, luminance degradation when the panel displays all white.