Patent ID: 7446742

Claim:
A light emitting device comprising: a plurality of pixels, each of the plurality of pixels comprising: a light emitting element; a first transistor for determining a current value supplied to the light emitting element; a second transistor for selecting emission or non-emission of the light emitting element according to a video signal; and a first power supply line, wherein the plurality of pixels share a second power supply line; a compensation circuit comprising: a third transistor having a gate and a drain electrically connected to each other, a fourth transistor for controlling the connection between a third power supply line and the gate and the drain of the third transistor; and a fifth transistor for controlling supply of a drain current of the third transistor to the second power supply line, wherein the first transistor and the second transistor are connected in series between the light emitting element and the first power supply line; and wherein a gate of the first transistor is connected to the second power supply line.