Patent ID: 7714816

Claim:
A display device comprising: a current source; a monitor pixel region comprising: a first wiring; a second wiring; a first light-emitting element; and a first transistor; a display portion including a pixel, a source driver, and a gate driver, the pixel comprising: a second transistor; and a second light-emitting element electrically connected to one of a source and a drain of the second transistor; and a first sampling circuit electrically connected to the first wiring and the other of the source and the drain or the second transistor, wherein one of a source and a drain of the first transistor is electrically connected to the current source through the first wiring, wherein the other of the source and the drain of the first transistor is connected to a gate of the first transistor, and wherein the other of the source and the drain of the first transistor and the gate of the first transistor are electrically connected to the second wiring and one electrode of the first light-emitting element.