Patent ID: 7773082

Claim:
A display device comprising: a scanning line; a first signal line; a second signal line; a third signal line; a pixel comprising: a first transistor having a first gate electrode connected to the scanning line, and a first semiconductor film connected to the first signal line; and a first light emitting element connected to the first semiconductor film; a monitoring element comprising: a second transistor having a second gate electrode connected to the scanning line, and a second semiconductor film connected to the second signal line; and a second light emitting element connected to the second semiconductor film; and a dummy pixel comprising: a third transistor having a third gate electrode connected to the scanning line, and a third semiconductor film connected to the third signal line; and a third light emitting element, wherein the third light emitting element is not connected to the third semiconductor film, wherein the first signal line is connected to an FPC, and wherein the second signal line is connected to a power source voltage controller.