Patent ID: 7352133

Claim:
An active matrix light emitting device comprising: a pixel portion in which a light emitting element is provided in a pixel, the pixel portion comprising: a source line; a power source line; a gate line; and a first TFT having a first gate electrode, a first source region and a first drain region; a second TFT having a second gate electrode, a second source region and a second drain region; a gate line driving circuit connected to the gate line; and a source line driving circuit connected to the source line, wherein the first gate electrode is connected to the gate line, wherein one of the first source region and the first drain region is connected to the source line, wherein the other of the first source region and the first drain region is connected to the second gate electrode, wherein one of the second source region and the second drain region is connected to the power source line, wherein the other of the second source region and the second drain region is connected to the light emitting element, and wherein an electric potential of the power source line is the same as one of a higher electric potential and a lower electric potential of a video signal when the second TFT is turned off.