Display device and driving method thereof

A display device, comprising:

• a signal line to transmit a first control signal, the first control signal comprising a first switch-on voltage in a first period and a second period;
• a scan line to transmit a scan signal, the scan signal comprising a second switch-on voltage in a third period;
• a data line to transmit a gray voltage that corresponds to an input image signal in the third period;
• a light emitting element that comprises a first terminal and a second terminal, the second terminal being connected to a first driving voltage;
• a first transistor that comprises a control terminal, a first terminal, and a second terminal, the second terminal being connected to the first terminal of the light emitting element;
• a second transistor connected between the data line and the control terminal of the first transistor, the second transistor being turned on in response to the second switch-on voltage of the scan signal;
• a third transistor connected between a black voltage that corresponds to a black gray and the control terminal of the first transistor, the third transistor being turned on in response to the first switch-on voltage of the first control signal;
• a fourth transistor connected between the first terminal of the light emitting element and a reference voltage, the fourth transistor being turned on in response to a third switch-on voltage of a second control signal, the second control signal comprising the third switch-on voltage in the first period and a switch-off voltage in the second period, and
• a capacitor connected between the control terminal and the second terminal of the first transistor.

A method of driving a display device that comprises a driving transistor comprising a control terminal, a first terminal, and a second terminal, at least one switching transistor connected to the control terminal of the driving transistor, a light emitting element comprising a first terminal and a second terminal connected to a first driving voltage, and a capacitor connected between the control terminal and the second terminal of the driving transistor, the method comprising:

• applying a black voltage that corresponds to a black gray to the control terminal of the driving transistor through the at least one switching transistor in a first period and a second period;
• connecting the first terminal of the light emitting element to a reference voltage in the first period;
• separating the first terminal of the light emitting element from the reference voltage in the second period;
• and
• applying a gray voltage that corresponds to an input image signal to the control terminal of the driving transistor through the at least one switching transistor in a third period.