. "Numeral 1 denotes an insulating substrate such as glass or the like, numeral 2 a gate insulating layer, numeral 3 an amorphous silicon layer, numeral 4 a protective insulating layer, numeral 9 a gate electrode, numeral 12 a source wiring, numeral 13 a pixel electrode, numeral 15 a source electrode, and numeral 16 a drain electrode." . . . .