rode (Embodiment Mode 5); FIG. 8 is a cross-sectional view of a liquid crystal module (Embodiment Mode 6); FIGS. 9A and 9B are an equivalent circuit and a top view of a light-emitting device, respectively (Embodiment Mode 7); FIG. 10 is a cross-sectional view of a pixel in a light-emitting device (Embodiment Mode 7); FIGS. 11A to 11C are each a top view showing a structure of a display panel as ex