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. 11, 2012
Filed:
Oct. 08, 2009
Munehiro Azami, Kanagawa, JP;
Shou Nagao, Kanagawa, JP;
Yoshifumi Tanada, Kanagawa, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Abstract
A drive circuit of a display device, which comprise only single conductive TFTs and in which amplitude of an output signal is normal, is provided. A pulse is inputted to TFTsandso that the TFTs would turn ON and then potential of a node á rises. When the potential of the node á reaches (VDD−VthN), the node á became in a floating state. Accordingly, a TFTthen turns ON, and potential of an output node rises as a clock signal reaches the level H. On the other hand, potential of a gate electrode of the TFTfurther rises due to an operation of capacitanceas the potential of the output node rises, so that the potential of the output node would be higher than (VDD+VthN). Thus, the potential of the output node rises to VDD without voltage drop caused by a threshold of the TFT. An output at the subsequent stage is then inputted to TFTsandto turn the TFTsandON, while the potential of the node á drops down to turn the TFTOFF. A TFTturns ON at the same time so that the potential of the output node would reach the level L.