Patent ID: 8502241

Claim:
A light-emitting device comprising: a pixel including a signal line, a first line, a second line, a light-emitting element, a first transistor, a second transistor and a third transistor over a substrate, wherein one of source and drain of the first transistor is connected to the light-emitting element, a gate of the first transistor is connected to one of source and drain of the second transistor, and one of source and drain of the third transistor, wherein the other of source and drain of the second transistor is connected to the signal line, a gate of the second transistor is connected to the first line, wherein a gate of the third transistor is connected to the second line, wherein a channel length L of the first transistor is larger than a channel width W of the first transistor, and wherein a semiconductor including a channel of the first transistor has an S-shape.