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:
Nov. 16, 2010
Filed:
Jan. 05, 2009
Masahiko Hayakawa, Kanagawa, JP;
Yu Yamazaki, Kanagawa, JP;
Yukari Ando, Gifu, JP;
Keisuke Miyagawa, Kanagawa, JP;
Jun Koyama, Kanagawa, JP;
Mitsuaki Osame, Kanagawa, JP;
Aya Anzai, Kanagawa, JP;
Shunpei Yamazaki, Tokyo, JP;
Satoshi Seo, Kanagawa, JP;
Hiroko Abe, Tokyo, JP;
Masahiko Hayakawa, Kanagawa, JP;
Yu Yamazaki, Kanagawa, JP;
Yukari Ando, Gifu, JP;
Keisuke Miyagawa, Kanagawa, JP;
Jun Koyama, Kanagawa, JP;
Mitsuaki Osame, Kanagawa, JP;
Aya Anzai, Kanagawa, JP;
Shunpei Yamazaki, Tokyo, JP;
Satoshi Seo, Kanagawa, JP;
Hiroko Abe, Tokyo, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
A display device where the influence of variations in current of the light emitting element due to changes in ambient temperature and changes with time can be suppressed. The display device of the invention has a light emitting element, a driving transistor connected in series to the light emitting element, a monitoring light emitting element, a limiter transistor connected in series to the monitoring light emitting element, a constant current source for supplying a constant current to the monitoring light emitting element, and a circuit for outputting a potential equal to an inputted potential. A first electrode of the light emitting element is connected to an output terminal of the circuit through the driving transistor, and a first electrode of the monitoring light emitting element is connected to an input terminal of the circuit through the limiter transistor. The channel length Land the channel width Wof the driving transistor, and the channel length Land the channel width Wof the limiter transistor satisfy L/W:L/W=1:2 to 1:10.