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:
Nov. 12, 2013
Filed:
Nov. 29, 2007
In-hwan Kim, Seoul, KR;
Seung-chan Byun, Incheon, KR;
Jin-hyoung Kim, Gyeonggi-do, KR;
LG Display Co., Ltd., Seoul, KR;
Abstract
The present invention relates to a method for properly controlling the drive current when driving an Active Matrix OLED (AMOLED) in order to prevent the brightness from being changed due to temperature changes in a panel or the performance deterioration of the OLED. The present invention comprises: an OLED (organic light emitting diode) panel that displays an image; pixel driving circuit including: a drive current control unit that outputs a current control signal corresponding to a detected current supplied to the OLED panel; and a comparator that compares the current control signal with a power supply voltage and outputs a bias voltage; and a transistor that receives the power supply voltage and that supplies a drive current to the OLED panel corresponding to the bias voltage.