Patent ID: 9620560
Date: 2017-04-11
CPC Classifications: H01L,H05B

Claim:
1. An electroluminescence (EL) display device comprising: a substrate; a plurality of pixel electrodes located on the substrate with intervals therebetween; wiring located on the substrate in at least one of the intervals between the pixel electrodes; a hole injection layer located on or above at least the pixel electrodes and the wiring; banks located above the substrate with openings therebetween, the openings corresponding to the pixel electrodes and the wiring, at least a portion of at least one of the banks being above a portion of the hole injection layer, the portion of the at least one of the banks and the portion of the hole injection layer overlapping with each other in a plan view; a plurality of light-emitting layer portions, each located in one of the openings on or above a corresponding one of the pixel electrodes in electrical connection therewith; an intermediate layer located at least in one of the openings on or above the wiring; a common electrode located on or above the light-emitting layer portions, and in electrical connection with the light emitting layer portions and the wiring, the intermediate layer and the hole injection layer being between the common electrode and the wiring; and a protective layer located on or above the common electrode, and preventing oxidization of the common electrode, wherein the common electrode is made of alkali metal or alkaline earth metal, and the intermediate layer is made of a base material and one of an alkali metal or alkaline earth metal for having a lower oxidization potential than the common electrode to prevent voltage drop in the common electrode.