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:
Mar. 04, 2014
Filed:
Dec. 03, 2008
Yoshinori Okada, Oita, JP;
Atsuhiro Miwata, Oita, JP;
Yoshinori Okada, Oita, JP;
Atsuhiro Miwata, Oita, JP;
Oki Semiconductor Co., Ltd., Tokyo, JP;
Abstract
A source driver includes a ladder circuit for outputting multilevel gradation voltages by resistance voltage division, a first decoder for selecting one gradation voltage corresponding to the inputted image data to output the selected gradation voltage, an external power supply for supplying multilevel pre-charging voltages, a second decoder for selecting one pre-charging voltage corresponding to the image data, an operational amplifier for outputting the driving voltage corresponding to the inputted gradation voltage to the source electrode, a pre-charging switch interconnected between the operational amplifier and second decoder, and a controller for controlling the pre-charging switch. The connection between the first decoder and operational amplifier is always kept during the whole sampling period including a pre-charging period, and the controller controls the pre-charging switch to be turned on during the pre-charging period and turned off after the pre-charging period has expired.