Patent ID: 7573193
Filing Date: 2009-08-11
Classification: H01L

Abstract:
1. An optical device comprising: a substrate; a light-emitting element configured to emit light and having a front electrode, a back electrode, and a photo-active layer, the back electrode being located above the substrate, the front electrode being located above the back electrode, and the photo-active layer being interposed between the front electrode and the back electrode and including an emitting layer; a light transmitting insulating layer located above the light-emitting element; a reflecting layer interposed between the light transmitting insulating layer and the substrate and spaced apart from the light-emitting element; and a diffraction grating interposed between the light transmitting insulating layer and the reflecting layer and facing the light-emitting element, wherein the diffraction grating has a grating constant such that a first-order diffracted light emerges from the light transmitting insulating layer, the first-order diffracted light being generated when a light component having a highest intensity of light which is emitted from the light-emitting element and propagates in an in-plane direction while causing multiple reflection in a region between the light transmitting insulating layer and the reflecting layer enters the diffraction grating.