Patent ID: 8558764

Claim:
A method of driving a light emitting device comprising: a first TFT, a second TFT, a third TFT, a fourth TFT, a capacitor, and an EL element, wherein a gate of the first TFT is directly connected to a first line, wherein a gate of the second TFT is directly connected to the first line, wherein one of a source and a drain of the third TFT is directly connected to one of a source and a drain of the first TFT, wherein one of a source and a drain of the fourth TFT is directly connected to the one of the source and the drain of the third TFT, wherein a gate of the fourth TFT is directly connected to a second line, wherein the other of the source and the drain of the first TFT is directly connected to a third line, wherein one of a source and a drain of the second TFT is directly connected to the one of the source and the drain of the third TFT, wherein the other of the source and the drain of the second TFT is directly connected to a first electrode of the capacitor, wherein a gate of the third TFT is directly connected to the first electrode of the capacitor, wherein the other of the source and the drain of the third TFT is directly connected to a second electrode of the capacitor, wherein the other of the source and the drain of the third TFT is directly connected to a fourth line, and wherein the other of the source and the drain of the fourth TFT is directly connected to the EL element, the method comprising the steps of: selecting the first line such that the first TFT and the second TFT are in ON state; and selecting the second line such that the fourth TFT is in ON state, wherein the second line is selected multiple times in one frame period.