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:
Sep. 25, 2012
Filed:
Jul. 26, 2011
Masahiko Hayakawa, Kanagawa, JP;
Yu Kojima, 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;
Hajime Kimura, Kanagawa, JP;
Masahiko Hayakawa, Kanagawa, JP;
Yu Kojima, 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;
Hajime Kimura, Kanagawa, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
The brightness of a light emitting element varies when changes in ambient temperature or changes with time occur. In view of this, the invention provides a display device where the influence of variations in the current value of the light emitting element due to changes in ambient temperature and changes with time can be suppressed. The display device of the invention includes a monitoring element that is driven with a constant current, and a voltage applied to the monitoring element is detected and inputted to a light emitting element. In other words, the monitoring element is driven with a low current, and a voltage applied to the monitoring element is inputted to the light emitting element such that the light emitting element is driven with a constant current.