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. 23, 2013
Filed:
Nov. 28, 2005
Applicants:
Hajime Kimura, Atsugi, JP;
Takuya Kimishima, Atsugi, JP;
Inventors:
Hajime Kimura, Atsugi, JP;
Takuya Kimishima, Atsugi, JP;
Assignee:
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 3/038 (2006.01);
U.S. Cl.
CPC ...
Abstract
To constitute a display panel only by transistors having the same conductivity type is difficult if a p-type transistor is adopted as a driving transistor. By constituting a circuit formed in the display panel by transistors having the same conductivity type, manufacturing process can be reduced, and cost reduction can be achieved. In the invention, an n-type transistor is used as a driving transistor for driving a light emitting element, and the driving transistor and the light emitting element constitute a source follower circuit.