Patent ID: 7046240

Claim:
A light emitting device having a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a light emitting element, a power supply line, and a signal line, wherein a source of the first transistor and a source of the second transistor are both connected to the power supply line, wherein the first transistor and the second transistor are connected to each other at their gates, wherein the third transistor has a source and a drain one of which is connected to the signal line and the other of which is connected to a drain of the first transistor, wherein the fourth transistor has a source and a drain one of which is connected to the drain of the first transistor or to the signal line and the other of which is connected to the gates of the first and second transistors, wherein the fifth transistor has a source and a drain one of which is connected to a drain of the first transistor and the other of which is connected to a drain of the second transistor, and wherein the drain of the second transistor is connected to a pixel electrode of the light emitting element.