Organic light emitting display device reliably compensating threshold voltage of a driving transistor and method of driving the same
AssigneeSamsung Display Co., Ltd.
InventorsCheol Min Kim, Dong Won Lee, Jae Keun Lim
Life of this patent
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Abstract
Provided herein may be an organic light emitting display device including: pixels coupled both to power source lines and scan lines that are formed on respective horizontal lines, and to data lines formed on respective vertical lines; a scan driver configured to supply scan signals to the scan lines; a first power source driver configured to supply first power sources to the power source lines; and a data driver configured to supply data signals to the data lines. The first power source driver may control light emitting operations of the pixels by successively stopping the supply of the first power sources to the power source lines.
Claims17
An organic light emitting display device comprising:
- a plurality of pixels, the plurality of pixels in a plurality of pixel rows coupled to a plurality of power source lines and to a plurality of scan lines, and the plurality of pixels in a plurality of pixel columns coupled to a plurality of data lines;
- a scan driver configured to supply scan signals to the scan lines;
- a first power source driver configured to supply first power sources to the power source lines;
- and
- a data driver configured to supply data signals to the data lines,
- wherein a one-frame period includes a first period, a second period, a third period, and a fourth period,
- wherein, in the first, second, and third periods, the scan driver is configured to simultaneously supply the plurality of pixels through the scan lines with the scan signals having a gate-on voltage to turn on a transistor, and, in the second period, the first power source driver is configured to simultaneously supply the first power sources to the plurality of pixels through the power source lines,
- wherein, in the fourth period, the scan driver is configured to successively supply the scan lines with the scan signals having the gate-on voltage to turn on the transistor, and the first power source driver is configured to control light emitting operations of the plurality of pixels by successively stopping the supply of the first power sources to the plurality of pixels through the power source lines,
- wherein, at a start point of the first period, the scan signals are simultaneously varied from a gate-off voltage to the gate-on voltage,
- wherein, in the first, second, and third periods, each of the scan signals is turned on,
- wherein, in the first period, the first power sources are not supplied to the power source lines,
- wherein at a start point of the second period, voltage levels of power sources supplied to the plurality of pixels through the power lines simultaneously change from a first voltage level to a second voltage level, and
- wherein, in the second and third periods, the first power sources supplied to the plurality of pixels through the power source lines are maintained to have the second voltage level.
A method of driving an organic light emitting display device comprising a plurality of pixels each of which includes an organic light emitting diode, a driving transistor, and a storage capacitor, wherein a one-frame period during which the plurality of pixels are driven is divided into a first period, a second period, a third period, and a fourth period,
- the method comprising:
- simultaneously initializing the plurality of pixels by a scan driver simultaneously supplying scan signals to the pixels during the first, second, and third periods, each of the scan signals having a gate-on voltage to turn on a transistor;
- simultaneously compensating for a threshold voltage of the driving transistor of each of the plurality of pixels by a first power source driver simultaneously supplying first power sources to the plurality of pixels through power source lines during the second period;
- fixing, during the third period, a voltage stored to the storage capacitor;
- and
- during the fourth period, storing a voltage corresponding to image data to the plurality of pixels and successively emitting light from the plurality of pixels by the scan driver successively supplying the pixels with the scan signals each having the gate-on voltage to turn on the transistor and by the first power source driver successively stopping the supply of the first power sources to the plurality of pixels through the power source lines,
- wherein, at a start point of the first period, the scan signals are simultaneously varied from a gate-off voltage to the gate-on voltage,
- wherein, in the first, second, and third periods, each of the scan signals is turned on,
- wherein, in the first period, the first power sources are not supplied to the power source lines,
- wherein at a start point of the second period, voltage levels of power sources supplied to the plurality of pixels through the power lines simultaneously change from a first voltage level to a second voltage level, and
- wherein, in the second and third periods, the first power sources supplied to the plurality of pixels through the power source lines are maintained to have the second voltage level.
Dependencies are inferred from the claim text.