Patent ID: 8283679

Claim:
A semiconductor device comprising: a first substrate provided with a first circuit including a first semiconductor element and a light-emitting element; and a second substrate provided with a second circuit including a second semiconductor element and a light-receiving element, wherein the light-emitting element which comprises an electroluminescent layer interposed between a pair of electrodes is formed over an insulating film, in which laser light is oscillated upon applying current to the electroluminescent layer; wherein the electroluminescent layer is adjacent to a conductive film which is formed over the insulating film; wherein the laser light oscillated from the electroluminescent layer is reflected by the conductive film; and wherein a signal is transmitted between the first circuit and the second circuit by generating a light signal using the laser light oscillated in the light-emitting element and converting the light signal into an electrical signal in the light-receiving element.