Pixel, organic light emitting display using the same, and associated methods
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United States of America Patent
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Apr 3, 2012
Grant Date -
Jan 29, 2009
app pub date -
Apr 10, 2008
filing date -
Apr 10, 2007
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Abstract
A pixel including an organic light emitting diode, a second transistor controlling a current supplied to the organic light emitting diode, a pixel circuit configured to compensate a threshold voltage of the second transistor; and a compensating unit controlling a voltage of a gate electrode of the second transistor in order to compensate for deterioration of the organic light emitting diode. The compensating unit includes seventh and eighth transistors coupled in series between the organic light emitting diode and a first power source, the seventh and eight transistors being commonly connected to a fourth node therebetween, first and second feedback capacitors coupled in series between the fourth node and a second node, the second node being coupled to the gate electrode of the second transistor, and a ninth transistor coupled between a predetermined voltage source and a fifth node that is common to the first and second feedback capacitors.
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