Display device and driving method thereof

A display device comprising:

• a light emitting element;
• a driving transistor having a first terminal connected to a driving voltage, a second terminal connected to the light emitting element, and a control terminal;
• a capacitor connected to the control terminal of the driving transistor and stores a control voltage depending on a common voltage, a data voltage and a threshold voltage of the driving transistor;
• a first switching element connected between the first terminal and the control terminal of the driving transistor for electrically connecting the control terminal and the first terminal of the driving transistor in response to a scanning signal;
• a second switching element operating in response to the scanning signal and connected between the capacitor and the data voltage;
• a third switching element operating in response to the scanning signal and connected between the second terminal of the driving transistor and the common voltage;
• a fourth switching element operating in response to an emission signal and connected between the driving voltage and the first terminal of the driving transistor;
• and
• a fifth switching element operating in response to the emission signal and connected between the capacitor and the second terminal of the driving transistor.

A method of driving a display device including a light emitting element, a driving transistor having a control terminal, a first terminal, and a second terminal connected to the light emitting element, and a capacitor connected to the control terminal of the driving transistor, the method comprising:

• connecting the control terminal and the first terminal of the driving transistor;
• connecting the second terminal of the driving transistor to a common voltage;
• connecting the capacitor to a data voltage;
• connecting the capacitor between the control terminal and the second terminal of the driving transistor;
• connecting the first terminal of the driving transistor to a driving voltage;
• and
• applying a first voltage depending on the common voltage, the data voltage and a threshold voltage of the driving transistor to the capacitor.

A display device comprising:

• a light emitting element;
• a driving transistor supplying a driving current to the light emitting element;
• and
• a data line providing a data voltage,
• wherein a cathode of the light emitting element and an output terminal of the driving transistor are connected to a common voltage during a charging period,
• the light emitting does not emit light during the charging period, and
• the output current of the light emitting element during an emission period after the charging period is ½ k (Vss−Vdata)2, where k is a constant, Vss is the common voltage, and Vdata is the data voltage,
• wherein a change in threshold voltage of the driving transistor does not substantially affect an output current of the light emitting element during an emission period.