Patent ID: 8120248

Claim:
A light-emitting device comprising: a substrate; a light-emitting element including a lower electrode, a light-emitting function layer, and an upper electrode that are formed on the substrate in that order; at least one auxiliary electrode in a strip shape extending in a first direction, disposed upon and in contact with the upper electrode, the auxiliary electrode having a cross section taken along the direction intersecting the first direction, the cross section having a shape including a tapered portion; a barrier layer covering the auxiliary electrode and the upper electrode, the barrier layer preventing at least one of water and oxygen from penetrating into the light-emitting element; a power line disposed on the substrate and setting the upper electrode and the auxiliary electrode to a predetermined potential; and a contact thin film disposed between 1)the upper electrode and auxiliary electrode, collectively and 2) the power line, the contact thin film being electrically connected to at least part of the upper electrode, the auxiliary electrode, and at least part of the power line, the contact thin film having a cross section taken along the first direction, and the contact thin film having a shape including a tapered portion, wherein the tapered portion of the cross section has an oblique side and a side adjacent to the oblique side that form an acute angle that is greater than 20° and less than 60°.