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US 11,145,254 B2Granted
Pixel having reduced luminance change and organic light emitting display device having the same
AssigneeSamsung Display Co., Ltd.
InventorHui Nam
Life of this patent
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Abstract
An organic light emitting display device includes a display panel and a display driver. Each of the pixels included in the display panel has a first switching element, a second switching element, and a third switching element that are switching elements of a first type, and the fourth switching element that is the switching element of a second type different from the first type.
Claims19
An organic light emitting display device comprising:
- a display panel comprising a plurality of pixels;
- and
- a panel driver configured to provide a first scan signal, a second scan signal, a data voltage, an initialization voltage, a first power voltage, and a second power voltage to the pixels, each of the pixels comprising:
- a first switching element having a gate electrode coupled to a first node, a first electrode coupled to a second node, and a second electrode coupled to a third node;
- a second switching element having a gate electrode to receive the first scan signal, a first electrode to receive the data voltage, and a second electrode coupled to the second node;
- a third switching element having a gate electrode to receive the first scan signal, a first electrode coupled to the first node, and a second electrode coupled to the third node;
- a fourth switching element having a gate electrode to receive the second scan signal, a first electrode coupled to the first node, and a second electrode to receive the initialization voltage;
- a storage capacitor having a first electrode to receive the first power voltage and a second electrode coupled to the first node;
- and
- an organic light emitting diode having a first electrode to receive a driving current from the first switching element and a second electrode to receive the second power voltage,
- wherein the first switching element, the second switching element, and the third switching element are switching elements of a first type, and the fourth switching element is a switching element of a second type different from the first type, and
- wherein a voltage of the first node is changed by a first level according to a change in the second scan signal from a gate-on voltage to a gate-off voltage, the voltage of the first node is changed by a second level according to a change in the first scan signal from a gate-on voltage to a gate-off voltage, and the first level and the second level offset each other.
9 more elements
A pixel of an organic light emitting display device, the pixel comprising:
- a first switching element having a gate electrode coupled to a first node, a first electrode coupled to a second node, and a second electrode coupled to a third node;
- a second switching element having a gate electrode that receives a first scan signal, a first electrode that receives a data voltage, and a second electrode coupled to the second node;
- a third switching element having a gate electrode to receive the first scan signal, a first electrode coupled to the first node, and a second electrode coupled to the third node;
- a fourth switching element having a gate electrode to receive a second scan signal, a first electrode coupled to the first node, and a second electrode to receive an initialization voltage;
- a storage capacitor having a first electrode to receive a first power voltage and a second electrode coupled to the first node;
- and
- an organic light emitting diode having a first electrode to receive a driving current provided by the first switching element and a second electrode to receive a second power voltage,
- wherein the first switching element, the second switching element, and the third switching element are switching elements of a first type, and the fourth switching element is a switching element of a second type different from the first type, and
- wherein a voltage of the first node is changed by a first level according to a change in the second scan signal from a gate-on voltage to a gate-off voltage, the voltage of the first node is changed by a second level according to a change in the first scan signal from a gate-on voltage to a gate-off voltage, and the first level and the second level offset each other.
6 more elements
An organic light emitting display device comprising:
- a display panel comprising a plurality of pixels;
- a data driver configured to generate a data voltage provided to the pixels;
- a scan driver configured to generate a first scan signal and a second scan signal provided to the pixels;
- an emission controller configured to generate an emission control signal provided to the pixels;
- and
- a timing controller configured to generate control signals that control the data driver, the scan driver, and the emission controller,
- wherein the timing controller is configured to receive image data to be displayed on the display panel, and to output a first level control signal that controls a voltage level of the first scan signal and a second level control signal that controls a voltage level of the second scan signal based on grayscale values of the image data, and
- wherein the timing controller is configured to generate the first level control signal and the second level control signal based on an average value of the grayscale values of the image data.
5 more elements
Dependencies are inferred from the claim text.