Patent ID: 7528808

Claim:
A pixel circuit comprising: a first transistor electrically connected to a power supply line, a gate of the first transistor being supplied with a first control signal, the first transistor being a first conductive type; a second transistor electrically connected to a light emitting device, a gate of the second transistor being supplied with the first control signal, the second transistor being the first conductive type; a drive transistor positioned between the first and second transistors, the drive transistor supplying a power to the light emitting device from the power supply line when the first transistor and the second transistor are turned on by a first level of the first control signal; a third transistor electrically connected to a first node between the first transistor and the drive transistor, a gate of the third transistor being supplied with the first control signal, the third transistor being a second conductive type; and a fourth transistor electrically connected to a second node between the second transistor and the drive transistor, the fourth transistor electrically connected to a voltage supply line, a gate of the fourth transistor being supplied with the first control signal, the fourth transistor being the second conductive type, the drive transistor being set in a diode-connected state when the third transistor and the fourth transistor are turned on by a second level of the first control signal.