Patent ID: 8071982

Claim:
A display device comprising: a driver circuit; and a pixel comprising a light emitting element, a first transistor, a second transistor, a third transistor, a fourth transistor and a capacitor, wherein the first transistor and the second transistor are electrically connected in series between the light emitting element and a first line, wherein one of a source and a drain of the third transistor is electrically connected to a gate of the first transistor, wherein one of a source and a drain of the fourth transistor is electrically connected to the other of the source and the drain of the third transistor, wherein the other of the source and the drain of the fourth transistor is electrically connected to a current source circuit via a second line, wherein a gate of the fourth transistor is electrically connected to a third line, wherein one electrode of the capacitor is electrically connected to the gate of the first transistor, wherein the other electrode of the capacitor is electrically connected to the first line, wherein the driver circuit is configured to output signals to turn off the second transistor several times in one frame, and wherein the driver circuit is formed over a same substrate as the pixel.