Patent ID: 8207916

Claim:
A light emitting device comprising: a pixel comprising: a source signal line; a gate signal line; a first transistor; a second transistor; a first electric power source line; an electroluminescence element; a third transistor; and a second electric power source line, wherein a gate of the first transistor is electrically connected to the gate signal line, wherein one of a source and a drain of the first transistor is electrically connected to the source signal line, wherein a gate of the second transistor is electrically connected to the other of the source and the drain of the first transistor, wherein one of a source and a drain of the second transistor is directly connected to the electroluminescence element, wherein the other of the source and the drain of the second transistor is electrically connected to the first electric power source line, wherein on of a source and a drain of the third transistor is directly connected to the electroluminescence element, wherein the other of the source and the drain of the third transistor is electrically connected to the second electric power source line, and wherein the first electric power source line is arranged parallel to the second electric power source line.