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US 12,223,901 B2Granted
Pixel and display device including the same
AssigneeSamsung Display Co., Ltd.
InventorsDae Youn Cho, Jong Woo Park, Jun Seok Oh, Yoon Suk Choi, Young Tae Choi
Life of this patent
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Abstract
A pixel of a display device may pre-charge a light emitting element in non-emission periods immediately before emission periods by varying a voltage level of an initialization voltage. As a result, a luminance non-uniformity phenomenon that may occur as the result of a deterioration deviation of the light emitting element may be removed or reduced.
Claims16
A pixel, comprising:
- a light emitting element;
- a first transistor connected between a first node and a second node and configured to generate a driving current flowing from a first power line providing a first power voltage to a second power line providing a second power voltage through the light emitting element;
- a second transistor connected between a data line and the first node and configured to be turned on in response to a fourth scan signal supplied to a fourth scan line;
- a third transistor connected between the second node and a third node corresponding to a gate electrode of the first transistor and configured to be turned on in response to a third scan signal supplied to a third scan line;
- a fourth transistor connected between the third node and a third power line providing a third power voltage and configured to be turned on in response to a second scan signal supplied to a second scan line;
- a fifth transistor connected between the first power line and the first node and configured to be turned off in response to an emission control signal supplied to an emission control line;
- a sixth transistor connected between the second node and a fourth node corresponding to a first electrode of the light emitting element and configured to be turned off in response to the emission control signal;
- a seventh transistor connected between the fourth node and a fourth power line providing a fourth power voltage and configured to be turned on in response to a first scan signal supplied to a first scan line;
- and
- an eighth transistor connected between the first node and a fifth power line providing a fifth power voltage and configured to be turned on in response to the first scan signal,
- wherein, during one frame period, the first scan signal is supplied to the first scan line at least twice during a first non-emission period and at least once during a second non-emission period, and
- wherein, in the one frame period, a voltage level of the fourth power voltage varies,
- wherein the one frame period comprises:
- a first driving period in which the fourth scan signal is supplied to the second transistor, a data signal supplied to the data line is written, and the first scan signal is supplied to the eighth transistor;
- and
- a second driving period in which the fourth scan signal is not supplied to the second transistor and the first scan signal is supplied to the eighth transistor.
13 more elements
A display device, comprising:
- a pixel connected to first to fourth scan lines, an emission control line, a data line, and first to fifth power lines;
- a scan driver configured to supply first to fourth scan signals to the first to fourth scan lines, respectively;
- an emission driver configured to supply an emission control signal to the emission control line;
- a data driver configured to supply a data signal to the data line;
- and
- a power supply configured to supply first to fifth power voltages to the first to fifth power lines, respectively,
- wherein the pixel comprises:
- a light emitting element;
- a first transistor connected between a first node and a second node and configured to generate a driving current flowing from the first power line to the second power line through the light emitting element;
- a second transistor connected between the data line and the first node and configured to be turned on in response to the fourth scan signal;
- a third transistor connected between the second node and a third node corresponding to a gate electrode of the first transistor and configured to be turned on in response to the third scan signal;
- a fourth transistor connected between the third node and the third power line and configured to be turned on in response to the second scan signal;
- a fifth transistor connected between the first power line and the first node and configured to be turned off in response to the emission control signal;
- a sixth transistor connected between the second node and a fourth node corresponding to a first electrode of the light emitting element and configured to be turned off in response to the emission control signal;
- a seventh transistor connected between the fourth node and the fourth power line and configured to be turned on in response to the first scan signal;
- and
- an eighth transistor connected between the first node and the fifth power line and configured to be turned on in response to the first scan signal,
- wherein the scan driver supplies the first scan signal to the first scan line at least twice during a first non-emission period and at least once during a second non-emission period during one frame period,
- wherein the power supply varies a voltage level of the fourth power voltage in the one frame period,
- wherein the one frame period comprises a first driving period and a second driving period,
- wherein, in the first driving period, the scan driver supplies the first scan signal through the first scan line and supplies the fourth scan signal through the fourth scan line, and
- wherein, in the second driving period, the scan driver supplies the first scan signal through the first scan line and does not supply the fourth scan signal.
19 more elements
Dependencies are inferred from the claim text.