. . "Note that in each light-emitting element, when the optical distance between a light-emitting region and a reflecting electrode (an electrode which reflects light) is L and a desired wavelength of light is ??, a so-called micro resonator structure (a micro cavity structure) which satisfies L=(2 m???1)??/4 (note that m is a natural number not less than 1) can be employed in order to increase the col" . .