| CPC G09G 3/3283 (2013.01) [G09G 2320/02 (2013.01); G09G 2330/021 (2013.01)] | 11 Claims |
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1. A display device, comprising:
a light emitting diode; and
a pixel driving circuit for driving the light emitting diode,
wherein the pixel driving circuit includes:
a driving transistor for applying a driving current to the light emitting diode;
a first transistor for applying a first reference voltage to a gate electrode of the driving transistor;
a second transistor for applying a data voltage to the gate electrode of the driving transistor;
a third transistor for applying a second reference voltage to a source electrode of the driving transistor;
a fourth transistor which is connected between the second transistor and the driving transistor to transmit the data voltage to the gate electrode of the driving transistor; and
a storage capacitor connected to the gate electrode and the source electrode of the driving transistor,
wherein the first transistor, the second transistor and the fourth transistor are controlled by different scan signals,
wherein the first transistor is for being controlled by a first scan signal and is connected between a first reference voltage line for supplying the first reference voltage and the gate electrode of the driving transistor, the second transistor is for being controlled by a fourth scan signal and is connected between a data line for supplying the data voltage and the fourth transistor, the third transistor is for being controlled by a third scan signal and is connected between a second reference voltage line for supplying the second reference voltage and the source electrode of the driving transistor, and the fourth transistor is for being controlled by a second scan signal and is connected between the second transistor and the gate electrode of the driving transistor, and
wherein in a first period in which the light emitting diode and the driving transistor are initialized, the first scan signal and the third scan signal are gate on voltages and the second scan signal and the fourth scan signal are gate off voltages, in a second period in which a threshold voltage of the driving transistor is sensed, a part of the first scan signal and the fourth scan signal is a gate on voltage and the second scan signal and the third scan signal are gate off voltages, in a third period in which the data voltage is applied and a mobility of the driving transistor is sensed, the second scan signal and the fourth scan signal are gate on voltages and the first scan signal and the third scan signal are gate off voltages, and in a fourth period in which the light emitting diode emits light, a part of the second scan signal is a gate on voltage and the first scan signal, the third scan signal, and the fourth scan signal are gate off voltages.
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