Organic light emitting display device and driving method thereof
AssigneeSamsung Display Co., Ltd.
InventorsSang-Hyun Lee, Jong-Woon Kim
Life of this patent
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Abstract
An organic light emitting display device is disclosed. One inventive aspect includes a plurality of pixels provided at a region sectioned by scan lines and data lines and an initialization power unit. The plurality of pixels are configured to control the amount of a current flowing from a first power source to a second power source through an organic light emitting diode in response to a data signal. The initialization power unit supplies initialization power to a driving transistor within each pixel circuit. The initialization power unit further controls the voltage of the initialization power supply to maintain a substantially constant voltage difference between the second power source and the initialization power.
Claims24
An organic light emitting display device, comprising:
- a plurality of pixels formed in a region defined by intersections of a plurality of scan lines and a plurality of data lines, the pixels being configured to control an amount of current flowing from a first power source to a second power source through an organic light emitting diode in response to at least a data signal;
- and
- an initialization power generator configured to supply an initialization power to a driving transistor of one of the plurality of pixels, wherein the initialization power generator is configured to control a voltage of the initialization power to maintain a constant voltage difference between the second power source and the initialization power, and wherein a voltage of the second power source and the voltage of the initialization power are different,
- wherein one of the plurality of the pixels further comprises a first transistor electrically connected between the organic light emitting diode and the initialization power voltage, the first transistor being configured such that leakage current flowing therethrough is independent of changes in the load to the pixels.
A method of driving an organic light emitting display device comprising a pixel configured to control an amount of a current flowing from a first power source to a second power source through an organic light emitting diode, the method comprising:
- generating an initialization power to maintain a constant voltage difference between the second power source and the initialization power, wherein the pixel comprises a first transistor electrically connected between the organic light emitting diode and the initialization power voltage, and wherein a voltage of the second power source and the voltage of the initialization power are different;
- supplying a voltage of the initialization power to a driving transistor of the pixel before a data signal is supplied;
- and
- supplying a leakage voltage through the first transistor, wherein the leakage current is independent of changes in the load to the pixel.
An organic light emitting display device, comprising:
- pixels formed in a region defined by intersections of a plurality of scan lines and a plurality of data lines, the pixels being configured to control an amount of a current flowing from a first power source to a second power source through an organic light emitting diode in response to at least one data signal;
- and
- an initialization power generator configured to supply at least one initialization power source to at least one of the pixels, wherein the initialization power generator is configured to control a voltage of the at least one initialization power source to maintain a constant voltage difference between the second power source and the at least one initialization power source, and wherein the voltage of the initialization power source is lower than a voltage of the second power source, and
- wherein a first pixel of the pixels comprises a first transistor electrically connected between a first electrode of the organic light emitting diode and the at least one initialization power source, the first transistor being turned on in response to a scan signal supplied to a first scan line from among the scan lines to provide the at least one initialization power source to the first electrode of the organic light emitting diode, the first transistor providing a path through which a leakage current flows from the first electrode of the organic light emitting diode to the at least one initialization power source when the scan signal is not supplied to the first scan line.
An organic light emitting display device, comprising:
- pixels formed in a region defined by intersections of a plurality of scan lines and a plurality of data lines, the pixels being configured to control an amount of a current flowing from a first power source to a second power source through an organic light emitting diode in response to at least one data signal;
- and
- an initialization power generator configured to supply at least one initialization power source to at least one of the pixels, the initialization power generator controlling a voltage of the at least one initialization power source so that a voltage difference between the at least one initialization power source and the second power source is substantially constant,
- wherein the voltage of the initialization power source is lower than the voltage of the second power source, and
- wherein a first pixel of the pixels comprises a first transistor electrically connected between a first electrode of the organic light emitting diode and the at least one initialization power source, the first transistor being turned on in response to a scan signal supplied to a first scan line from among the scan lines to provide the at least one initialization power source to the first electrode of the organic light emitting diode, the first transistor providing a path through which a leakage current flows from the first electrode of the organic light emitting diode to the at least one initialization power source when the scan signal is not supplied to the first scan line.
Dependencies are inferred from the claim text.