Next, an electroluminescent display device (hereinafter also referred to as an EL display device) will be described with reference to FIGS. 10A and 10B in addition to the liquid crystal display device shown in FIGS. 9A and 9B. FIG. 10A is a plane view of a pixel of the EL display device and includes a selection transistor 1001 which connects to the signal line 812 and a display control transistor