"In the present embodiment, an element structure when a light-emitting element is formed in a pixel portion of a panel will be explained with reference to FIGS. 12A through 12C. FIG. 12A is a diagram showing a sectional structure of a light-emitting element in a pixel portion, and FIGS. 12B and 12C are diagrams showing an element structure of the light-emitting element." . . . .