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:
Jul. 03, 2012
Filed:
Mar. 30, 2007
Gyu-hyeong Cho, Chungcheongnam-do, KR;
Young-suk Son, Hwaseong-si, KR;
Sang-kyung Kim, Daejeon-si, KR;
Jin-yong Jeon, Daegu, KR;
Gun-ho Lee, Gyeonggi-do, KR;
Gyu-Hyeong Cho, Chungcheongnam-do, KR;
Young-Suk Son, Hwaseong-si, KR;
Sang-Kyung Kim, Daejeon-si, KR;
Jin-Yong Jeon, Daegu, KR;
Gun-Ho Lee, Gyeonggi-do, KR;
Korea Advanced Institute of Science and Technology, Daejeon-si, KR;
Abstract
Disclosed herein is an Active Matrix Organic Light-Emitting-Diode (AMOLED) drive circuit using transient current feedback. The AMOLED drive circuit includes a current Digital-to-Analog Converter (DAC), a data line drive transistor, a constant current source, a variable current source, a differential amplifier, and a transient charging current control unit. The DAC generates current corresponding to input digital data. The data line drive transistor is configured such that the drain terminal thereof is connected to the output node of the current DAC. The constant current source is connected between the source terminal of the data line drive transistor and a ground. The variable current source is connected between both the output node of the current DAC and the drain terminal of the drive transistor, and a voltage source. The differential amplifier is configured to input the output voltage thereof to the gate terminal of the drive transistor. The transient charging current control unit is configured to increase or decrease the bias current of the variable current source depending on variation in the voltage of the output node of the current DAC.