Patent ID: 7920107

Claim:
A display comprising: a pixel comprising: a current driven element emitting a light in response to a current; a capacitor holding a voltage that corresponds to the current; a first transistor supplying the current to the current driven element, the first transistor having a drain, a source, and a gate; a second transistor disposed between the first transistor and the current driven element, the second transistor enabling the current to flow between the first transistor and the current driven element, when the second transistor being turned on, wherein a gate of the second transistor is connected to a first scanning line; a third transistor having a drain, a source, and a gate; and a fourth transistor having a drain, a source, and a gate, the gate of the third transistor and the gate of the fourth transistor being connected to a second scanning line, wherein the second scanning line is different from the first scanning line, and wherein, a first length of period while the second transistor is turned on is controlled depending on a brightness of an external light, and the capacitor is connected between the gate of the first transistor and a power-supply line.