Patent ID: 8552943
Filing Date: 2013-10-08
Classification: G09G

Abstract:
1. A pixel circuit comprising: a light emitting device comprising a first electrode and a second electrode; a first transistor comprising a first electrode and a second electrode and for outputting a drive current according to a voltage applied to a gate electrode of the first transistor; a first capacitor comprising a first terminal and a second terminal coupled to the gate electrode of the first transistor; a second transistor for transferring a data signal to the first terminal of the first capacitor in response to a scan control signal applied to a gate electrode of the second transistor; a third transistor for diode-connecting the first transistor in response to the scan control signal applied to a gate electrode of the third transistor; a fourth transistor for applying the first power voltage to the first electrode of the first transistor in response to an emission control signal; and a fifth transistor for applying a sustain voltage to the first terminal of the first capacitor in response to the emission control signal, wherein the first transistor and the second to fifth transistors are N-type transistors, wherein the scan control signal and the emission control signal are driven in a first period, a second period, a third period, and a fourth period, in the first period, the scan control signal is at a first level, and the emission control signal is at the first level; in the second period, the data signal having an effective level is applied to the pixel circuit, the scan control signal is at the first level, and the emission control signal is at a second level; in the third period, the data signal is at the second level, and the emission control signal is at the second level, and in the fourth period, the scan control signal is at the second level, and the emission control signal is at the first level, and wherein the first level is a level at which the first transistor and the second to fifth transistors are turned on, and the second level is a level at which the first transistor and the second to fifth transistors are turned off.