A display device comprising: a pixel portion (1701, 602) comprising a switching thin film transistor (605, 201), a current control thin film transistor (608, 202) and a driving circuit (1702, 1703, 603, 604)over a substrate (1700,601); an interlayer insulating film over the switching thin film transistor and the current control thin film transistor; a first electrode over the interlayer insulating film; a light emitting layer comprising an organic material formed over the first electrode; a second electrode over the light emitting layer comprising the organic material the first electrode, the light emitting layer and the second electrode forming an electroluminescent element (610,203) and a housing material opposed to the substrate by an adhesive, thereby forming an airtight space between the substrate and the housing material, wherein the pixel portion (1701, 602) and at least a part of the driving circuit (1702, 1703) are located in a region surrounded by the adhesive, wherein the source of the current control thin film transistor (608, 202) is connected to a current supply line (609, 212), the drain of the switching thin film transistor (605, 201) is electrically connected to the gate of the current control thin film transistor (608, 202), and the electroluminescent element (610,203) is electrically connected to the drain of the current control thin film transistor (608, 202), characterized in that the switching thin film transistor comprises an active layer in which two or more channel regions (17a, 17b) connected in series are formed, and wherein a multi-gate structure is used for the current control thin film transistor, and wherein the driving circuit comprises a third thin film transistor (1700, 601). a pixel portion (1701, 602) comprising a switching thin film transistor (605, 201), a current control thin film transistor (608, 202) and a driving circuit (1702, 1703, 603, 604)over a substrate (1700,601); an interlayer insulating film over the switching thin film transistor and the current control thin film transistor; a first electrode over the interlayer insulating film; a light emitting layer comprising an organic material formed over the first electrode; a second electrode over the light emitting layer comprising the organic material the first electrode, the light emitting layer and the second electrode forming an electroluminescent element (610,203) and a housing material opposed to the substrate by an adhesive, thereby forming an airtight space between the substrate and the housing material, wherein the pixel portion (1701, 602) and at least a part of the driving circuit (1702, 1703) are located in a region surrounded by the adhesive, wherein the source of the current control thin film transistor (608, 202) is connected to a current supply line (609, 212), the drain of the switching thin film transistor (605, 201) is electrically connected to the gate of the current control thin film transistor (608, 202), and the electroluminescent element (610,203) is electrically connected to the drain of the current control thin film transistor (608, 202), characterized in that the switching thin film transistor comprises an active layer in which two or more channel regions (17a, 17b) connected in series are formed, and wherein a multi-gate structure is used for the current control thin film transistor, and wherein the driving circuit comprises a third thin film transistor (1700, 601).