Patent ID: 7656088

Claim:
An organic electroluminescent (EL) device comprising: a substrate; a first electrode, an organic layer and a second electrode provided on the substrate to form a light-emitting region; and a cap to seal the light-emitting region, the cap having a caved surface between a first boundary point and a second boundary point, a top surface that faces away from the substrate and a bottom surface that faces the substrate, the cap having a thickness in a first direction between the top surface and the bottom surface, the bottom surface defining a second plane in a second direction, the caved surface including a top point that is a furthest point on the caved surface from the substrate, wherein the cap has the caved surface that satisfies a first condition, a second condition, and a third condition, wherein the first condition is that the caved surface has a depth in a range of 10 μm-10% of a total thickness of the cap, wherein the depth is a distance in the first direction from the second plane to the top point, and the total thickness of the cap is the thickness in the first direction between the top surface and the bottom surface, the second condition is that a distance in the second direction between the first boundary point of the caved surface and a boundary line of the light-emitting region is 70 μm-4 mm, and the third condition is that an angle between the bottom surface of the cap at the first boundary point and an inclined surface of the caved surface at the first boundary point is 1°-60°.