Pixel, organic light emitting display using the same, and associated methods
First Claim
1. A pixel, comprising:
- 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, wherein 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, anda 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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Accused Products
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.
69 Citations
25 Claims
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1. A pixel, comprising:
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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, wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A display, comprising;
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a scan driver coupled to scan lines and light emitting control lines; a data driver coupled to data lines; and a plurality of pixels coupled to the scan lines, the data lines, and the light emitting control lines, wherein each of the pixels includes; 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 including; 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of driving a display having seventh and eighth transistors coupled in series between an anode electrode of an organic light emitting diode and a first power source, and first feedback and second feedback capacitors coupled in series between a fourth node, which is a node common to the seventh and eighth transistors, and a gate electrode of a driving transistor, the method including:
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initializing a voltage of the gate electrode of the driving transistor with a voltage of an initialization power source; charging a voltage corresponding to a threshold voltage of the driving transistor and a data signal in a storage capacitor by diode-connecting the driving transistor; supplying a current corresponding to the voltage charged in the storage capacitor to the organic light emitting diode; applying a voltage applied to the organic light emitting diode to the fourth node; maintaining a fifth node, which is common to the first and second feedback capacitors, at a constant voltage while charging the voltage in the storage capacitor and supplying the voltage applied to the organic light emitting diode to the fourth node; and controlling the voltage of the gate electrode of the driving transistor by setting the fifth node to a floating stat and, at the same time, raising the voltage of the fourth node to the voltage of the first power source. - View Dependent Claims (23, 24, 25)
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Specification