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:
Feb. 27, 2007
Filed:
Oct. 25, 2004
Masao Karube, Fukaya, JP;
Masao Karube, Fukaya, JP;
Toshiba Matsushita Display Technology Co., Ltd., Tokyo, JP;
Abstract
In order to restrict variations of an output voltage of a DC—DC conversion circuit using TFTs, in a boost-type, a second n-ch TFT Nand a second p-ch TFT Pare newly provided. With regard to the second n-ch TFT N, a gate thereof is connected to a second capacitor C, a source thereof is connected to a first reference voltage source YVDD, and a drain thereof is connected to a first capacitor C. With regard to the second p-ch TFT P, a gate thereof is connected to the second capacitor C, a source thereof is connected to a third capacitor C, and a drain thereof is connected to the first capacitor C. Thus, a voltage at the first capacitor Cstops being influenced by the variations of a threshold voltage between a source and drain of a first diode D