Pixel circuit and display device including the same

A pixel circuit comprising:

• a driving element including a first electrode connected to a first node to which a pixel driving voltage is applied, a gate electrode connected to a second node, and a third electrode connected to a third node, the driving element configured to supply an electric current;
• a light emitting element configured to receive the electric current supplied by the driving element, the light emitting element including an anode electrode connected to the third node, and a cathode electrode to which a pixel ground voltage is applied;
• a first switch element configured to supply a data voltage to the second node in response to a scan pulse;
• a second switch element configured to supply a first initialization voltage to the third node in response to a first initialization pulse, the first initialization voltage set to a negative voltage that is less than the pixel ground voltage supply voltage;
• a third switch element configured to supply a second initialization voltage that is greater than the first initialization voltage to the second node in response to a second initialization pulse;
• a fourth switch element configured to supply to the third node a reference voltage set to a voltage greater than the pixel ground voltage supply voltage and less than the second initialization voltage responsive to a sensing pulse;
• and
• a capacitor connected between the second node and the third node.

A display device comprising:

• a display panel including a plurality of data lines, a plurality of gate lines crossing the data lines, a plurality of power lines, and a plurality of pixel circuits connected to the plurality of data lines, the plurality of gate lines, and the plurality of power lines;
• a data driver configured to supply a data voltage of pixel data to the plurality of data lines;
• and
• a gate driver configured to supply a gate signal to the plurality of gate lines,
• wherein the gate signal includes a first initialization pulse, a second initialization pulse, and a scan pulse, and
• wherein each of the plurality of pixel circuits includes:
• a driving element including a first electrode connected to a first node to which a pixel driving voltage is applied, a gate electrode connected to a second node, and a third electrode connected to a third node, the driving element configured to supply an electric current;
• a light emitting element configured to receive the electric current, the light emitting element including an anode electrode connected to the third node, and a cathode electrode to which a pixel ground voltage supply voltage is applied;
• a first switch element configured to supply the data voltage to the second node in response to the scan pulse;
• a second switch element configured to supply a first initialization voltage to the third node in response to the first initialization pulse, the first initialization voltage set to a negative voltage that is less than the pixel ground voltage supply voltage;
• a third switch element configured to supply a second initialization voltage that is greater than the first initialization voltage to the second node in response to the second initialization pulse;
• and
• a capacitor connected between the second node and the third node,
• wherein a driving period of the pixel circuit includes an initialization stage, a sensing stage, an addressing stage, a boosting stage, and a light emitting stage,
• wherein the first switch element to the third switch element are turned on according to a gate-on voltage, and turned off according to a gate-off voltage,
• wherein the first initialization pulse is generated as the gate-on voltage in the initialization stage, and as the gate-off voltage in the sensing stage, the addressing stage, the boosting stage, and the light emitting stage,
• wherein the second initialization pulse is generated as the gate-on voltage in the initialization stage and the sensing stage, and as the gate-off voltage in the addressing stage, the boosting stage, and the light emitting stage, and
• wherein the scan pulse is generated as the gate-on voltage in the addressing stage, and as the gate-off voltage in the initialization stage, the sensing stage, the boosting stage, and the light emitting stage.