Patent ID: 7999269

Claim:
A light emitting apparatus comprising: a light emitting element formed on a surface of a substrate; a light receiving element formed on an area other than an area overlapping the light emitting element on the surface of the substrate, the light receiving element detecting light emitted from the light emitting element, the light receiving element including a light receiving layer having a first single layer and a second single layer; a first detection electrode conducting electricity to the first single layer is formed above the first single layer; and a second detection electrode conducting electricity to the second single layer is formed above the second single layer, wherein the light receiving element is capable of generating a current corresponding to an amount of light emitted by the light emitting element, the first single layer of the light receiving layer is formed of one of a p-type semiconductor material or an n-type semiconductor material, the second single layer of the light receiving layer is formed of an other one of the p-type semiconductor material or the n-type semiconductor material, and an area of the first single layer overlapped by the first detection electrode is smaller than an area of the second single layer overlapped by the second detection electrode.