Patent ID: 9478594
Filing Date: 2016-10-25
CPC Classification: H01L

Claim Text:
1. A method of manufacturing an organic electroluminescent display device, comprising the steps of: forming a first insulating layer on a substrate having a rectangular display area and a frame area which surrounds an outer periphery of the display area; forming a first patterning layer on the first insulating layer; forming a second patterning layer on the first patterning layer; forming a trench portion by removing a part of the second patterning layer in the frame area and undercutting a part of the first patterning layer in the frame area; and forming an electrode layer on the second patterning layer and in the trench portion, wherein in the step of forming the trench portion, an end of the first patterning layer exposed within the trench portion is etched to an outside more than an end of the second patterning layer exposed within the trench portion in a plan view, and an overhang structure is formed by the first patterning layer and the second patterning layer, in the step of forming the electrode layer, the electrode layer is formed on the first patterning layer and within the trench portion, and the electrode layer which is formed on the first patterning layer is isolated from the electrode layer which is formed within the trench portion, a plurality of the display areas is arrayed in a matrix on the substrate, the trench portion is formed along an outer periphery of the display area in the plan view, and the frame area is cut along the trench portion after the electrode layer is formed to divide the substrate into a plurality of pieces.