Patent ID: 8077126

Claim:
A display device comprising a plurality of pixels, each pixel comprising: 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 first transistor to transmit a driving current that corresponds to a voltage between the control terminal and the second terminal to the light emitting element, the second terminal being connected to the first terminal of the light emitting element; at least one second transistor to transmit a black voltage that corresponds to a black gray to the control terminal of the first transistor in a first period and a second period, and to transmit a gray voltage that corresponds to an input image signal to the control terminal of the first transistor in a third period; a third transistor connected between the first terminal of the light emitting element and a voltage supply line, to transmit a reference voltage, the third transistor being on in the first period and off in the second period; and a capacitor connected between the control terminal and the second terminal of the first transistor to store a control voltage based on a threshold voltage of the first transistor in the second period and then to store a voltage based on the control voltage and the gray voltage in the third period.