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. 20, 2015
Filed:
Aug. 02, 2004
Keisuke Miyagawa, Kanagawa, JP;
Keisuke Miyagawa, Kanagawa, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
A driving method of a light emitting device, in which when an N-type driving TFT is connected to an anode of a light emitting element or a P-type driving TFT is connected to a cathode thereof, the driving TFT operates in a saturation region and an image can be displayed with a desired gray scale level depending on a video signal. In addition, a light emitting device adopting the driving method is provided. According to the invention, when a potential having image data is supplied to a gate of a driving TFT depending on a video signal, a reverse bias voltage is applied to the driving TFT and a light emitting element which are connected in series with each other. Meanwhile, when a pixel displays an image depending on the video signal, a forward bias voltage is applied to the driving TFT and the light emitting element.