Patent ID: 8477085

Claim:
A semiconductor device comprising: a signal line; a capacitor line; a power supply line; a first scan line; a second scan line; and a first pixel and a second pixel, each of the first pixel and the second pixel comprising: a load; a first transistor; a second transistor; and a capacitor comprising a third transistor comprising: a semiconductor layer electrically connected to a first electrode of the capacitor, a gate electrode electrically connected to a second electrode of the capacitor, and a gate insulating film interposed between the semiconductor layer and the gate electrode, wherein a first terminal of the first transistor of each of the first pixel and the second pixel is electrically connected to the signal line and the power supply line, wherein a second terminal of the first transistor of each of the first pixel and the second pixel is electrically connected to the load of the corresponding one of the first pixel and the second pixel, wherein a first terminal of the second transistor of each of the first pixel and the second pixel is electrically connected to a gate of the first transistor of the corresponding one of the first pixel and the second pixel, wherein a second terminal of the second transistor of each of the first pixel and the second pixel is electrically connected to the second terminal of the first transistor of the corresponding one of the first pixel and the second pixel, wherein a gate of the second transistor of the first pixel is electrically connected to the first scan line, wherein a gate of the second transistor of the second pixel is electrically connected to the second scan line, wherein the first electrode of the capacitor of each of the first pixel and the second pixel is electrically connected to the gate of the first transistor of the corresponding one of the first pixel and the second pixel, wherein the second electrode of the capacitor of each of the first pixel and the second pixel is electrically connected to the capacitor line, wherein each of the first transistor, the second transistor, and the third transistor of each of the first pixel and the second pixel is a p-channel transistor, and wherein a potential of the first electrode of the capacitor of each of the first pixel and the second pixel is higher than a potential of the capacitor line.