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US 9,437,167 B2Granted
Organic light-emitting display device having a high aperture raatio and driving method thereof
AssigneeLG Display Co., Ltd.
InventorsHunKi Shin, BumSik Kim
Life of this patent
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Abstract
Disclosed is an organic light-emitting display device and operating method thereof that may include an organic light-emitting diode, a first transistor controlled by a sensing signal and connected to a data line, a second transistor controlled by a scanning signal and connected to the data line, and a driving transistor having first to third nodes, wherein a reference voltage is applied to the first node through the first transistor, a data voltage is applied to the second node through the second transistor, and the third node is connected to a driving voltage line.
Claims8
An organic light-emitting display device comprising:
- a display panel including a plurality of data lines, a plurality of first gate lines and a plurality of second gate lines, which define a plurality of pixels;
- a data driver supplying a data signal through at least one of the plurality of data lines;
- a first gate driver supplying a sensing signal through at least one of the plurality of first gate lines that cross the plurality of data lines in the display panel;
- a second gate driver supplying a scanning signal through at least one of the plurality of second gate lines that are substantially parallel with the plurality of first gate lines in the display panel;
- and
- a timing controller controlling driving timings of the data driver, the first gate driver and the second gate driver,
- wherein one of the plurality of pixels includes an organic light-emitting diode, a driving transistor having a first node, a second node and a third node, a first transistor controlled by the sensing signal and connected between the respective data line and the first node of the driving transistor, a second transistor controlled by the scanning signal and connected between the respective data line and the second node of the driving transistor, and a storage capacitor connected between the first and second nodes of the driving transistor;
- and
- a sensing unit sensing a threshold voltage or a mobility of the driving transistor,
- wherein the sensing unit is connected to a driving voltage line connected to the third node of the driving transistor, the sensing unit comprises:
- an analog-to-digital converter measuring a voltage of a sensing node connected to the driving voltage line, and
- a switch switching a connection between a precharge voltage supply node and the sensing node and switching a connection between a connection node of the analog-to-digital converter and the sensing node.
9 more elements
A driving method of an organic light-emitting display device, the method comprising driving the organic light-emitting display device in an emission mode and a sensing mode, wherein:
- in the emission mode, the driving method comprising:
- turning on a first transistor connected between a data line and a first node of the driving transistor and applying a reference voltage through the data line to the first node of the driving transistor;
- subsequently turning off the first transistor to float a voltage of the first node of the driving transistor, and applying a data voltage through the data line to a second node of the driving transistor through a second transistor connected between the data line and the second node of the driving transistor;
- subsequently turning off the second transistor to allow a current to flow through an organic light-emitting diode connected to a third node of the driving transistor;
- and
- in the sensing mode, the driving method comprising:
- turning on a precharge switch coupled to a sensing node which is connected to the third node of the driving transistor to apply a precharge voltage to the sensing node, and turning on the second transistor and applying a data voltage to the second node of the driving transistor;
- subsequently turning off the precharge switch, and turning on the first transistor and applying the data voltage to the first node, so that a voltage of the sensing node increase;
- subsequently turning off the first transistor when the voltage increase of the sensing node stops and turning on a sampling switch coupled to the sensing node to sense the voltage of the sensing node;
- and
- subsequently determining the threshold voltage of the driving transistor from the sensed voltage of the sensing node.
8 more elements
A driving method of an organic light-emitting display device, the method comprising driving the organic light-emitting display device in an emission mode and a sensing mode, wherein:
- in the emission mode, the driving method comprising:
- turning on a first transistor connected between a data line and a first node of the driving transistor and applying a reference voltage through the data line to the first node of the driving transistor;
- subsequently turning off the first transistor to float a voltage of the first node of the driving transistor, and applying a data voltage through the data line to a second node of the driving transistor through a second transistor connected between the data line and the second node of the driving transistor;
- subsequently turning off the second transistor to allow a current to flow through an organic light-emitting diode connected to a third node of the driving transistor;
- and
- in the sensing mode, the driving method comprising:
- turning on a precharge switch coupled to a sensing node which is connected to the third node of the driving transistor to apply a precharge voltage to the sensing node, and turning on the first and second transistors to apply a data voltage to the first and second nodes of the driving transistor;
- subsequently turning off the second transistor;
- subsequently turning off the precharge switch, so that a voltage of the sensing node increase;
- subsequently turning off the first transistor, so that the voltage increase of the sensing node stops, and turning on a sampling switch coupled to the sensing node to sense the voltage of the sensing node;
- and
- subsequently determining the mobility of the driving transistor from the sensed voltage of the sensing node.
9 more elements
Dependencies are inferred from the claim text.