To provide an active matrix light emitting device that is capable of clear, multi-gray scale, color display. A pixel portion has a plurality of pixels each having an EL element, a switching TFT and an EL driver TFT. The EL element is composed of a pixel electrode, an opposing electrode, and an EL layer provided between the pixel electrode and the opposing electrode. The electric potential of the opposing electrode and the electric potential of the pixel electrode are controlled to obtain time division gray scale display.