Patent ID: 7851998

Claim:
A light emitting device comprising: a substrate; an active area on the substrate, the active area including a first electrode, a light emitting layer and a second electrode; a protective cap to seal with the substrate so as to cover the first electrode, the second electrode and the light emitting layer, the protective cap including a first surface, a second surface and a connecting surface to adjoin the first surface and the second surface, wherein a first radius of curvature of a corner of the first surface is greater than a second radius of curvature of a corner where the first surface adjoins the connecting surface, and the first radius of curvature is greater than a third radius of curvature of a corner where the second surface adjoins the connecting surface, wherein the first surface, the second surface and the connecting surface substantially have a same thickness, and wherein the first radius of curvature, the second radius of curvature and the third radius of curvature are radii of curvature on a plane that is substantially parallel to a surface of the substrate on which the active area is formed.