Patent ID: 8344972

Claim:
A light emitting device comprising: a first TFT comprising a gate, a first terminal and a second terminal; a second TFT comprising a gate, a first terminal and a second terminal, wherein one of the first terminal and the second terminal of the second TFT is electrically connected to one of the first terminal and the second terminal of the first TFT; a third TFT comprising a gate, a first terminal and a second terminal, wherein one of the first terminal and the second terminal of the third TFT is electrically connected to the other of the first terminal and the second terminal of the second TFT; and an electrode of an EL element, the electrode being electrically connected to the other of the first terminal and the second terminal of the third TFT, wherein the other of the first terminal and the second terminal of the second TFT is electrically connected to the gate of the second TFT, and wherein the gate of the first TFT is electrically connected to the gate of the third TFT.