A light-emitting device is provided, which is capable of correcting variation in luminance among pixels due to variation in electrical characteristics, such as threshold voltage or mobility, among driving transistors in a period where image display is performed. The light-emitting device includes a pixel; a first circuit configured to generate a signal including information about a value of current extracted from the pixel; and a second circuit configured to correct an image signal in accordance with the signal. The pixel includes a light-emitting element; a transistor whose drain current has a value determined in accordance with the image signal; a first switch configured to control supply of the drain current to the light-emitting element; and a second switch configured to control extraction of the drain current from the pixel and control the supply of the drain current to the light-emitting element.