Patent ID: 8330681

Claim:
A semiconductor device comprising: a pixel comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; an electroluminescence element; a source signal line; a first gate signal line; a second gate signal line; a first electric power source line; and a second electric power source line, wherein a gate of the first transistor is directly connected to the first gate signal line, wherein one of a source and a drain of the first transistor is directly connected to the source signal line, wherein the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor, wherein a gate of the third transistor is electrically connected to the other of the source and the drain of the first transistor, wherein the gate of the third transistor is directly connected to the one of the source and the drain of the second transistor, wherein one of a source and a drain of the third transistor is directly connected to the first electric power source line, wherein the other of the source and the drain of the third transistor is electrically connected to the electroluminescence element, wherein a gate of the fourth transistor is directly connected to the second gate signal line, wherein one of a source and a drain of the fourth transistor is directly connected to the second electric power source line, wherein the other of the source and the drain of the fourth 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 other of the source and the drain of the fourth transistor, wherein the source signal line, the first electric power source line, and the second electric power source line intersect with the first gate signal line.