There is provided a light emitting device capable of preventing light emission of an OLED caused due to an off current of a driver TFT and suppressing a reduction in a contrast, to thereby display a beautiful image. A wiring which is kept at a predetermined potential (hereinafter referred to as a discharge line) is provided to make the off current flow into the discharge line rather than into the OLED. A TFT such as is turned on when the driver TFT is tuned off (hereinafter referred to as a discharging TFT) is provided in each pixel. With respect to the source region and the drain region of the discharging TFT, one is connected with a pixel electrode and the other is connected with the discharge line. According to the above structure, when the driver TFT is turned off, the discharging TFT is turned on. Thus, the off current in the driver TFT actively flows into the discharge line rather than into the OLED.