Patent ID: 8059692

Claim:
A laser oscillator comprising: a light emitting element over a first layer comprising a concave portion; a second layer that is light-transmitting and that is formed to cover the light emitting element; and a third layer between the first layer and the light emitting element, wherein the light emitting element comprises: a first electrode over the first layer; a first organic electroluminescent layer over the first electrode; a second organic electroluminescent layer over the first organic electroluminescent layer; a charge generation layer between the first and second organic electroluminescent layers; and a second electrode over the second organic electroluminescent layer, wherein a first refractive index of the first layer is lower than a second refractive index of the third layer, wherein first light generated in the first organic electroluminescent layer and second light generated in the second organic electroluminescent layer are reflected at the first electrode and the second electrode, and wherein the concave portion has a curve.