DISPLAY DEVICE AND MOTHER BOARD FOR DISPLAY DEVICE

To suppress the decrease in reliability.SOLUTION: In one embodiment, a display device includes: an organic insulating layer disposed in a display region and a peripheral region; a lower electrode disposed on the organic insulating layer in the display region; a rib formed of an inorganic insulating material and overlapping with a peripheral part of the lower electrode; a partition wall including a lower part disposed on the rib and formed of a conductive material and an upper part disposed on the lower part and protruding from a side surface of the lower part; an organic layer disposed on the lower electrode and including a light-emitting layer; an upper electrode covering the organic layer and coming into contact with the lower part of the partition wall; and a terminal electrode disposed in the peripheral region. The organic insulating layer has a first opening exposing the terminal electrode. The rib extends to the peripheral region and has a second opening exposing the terminal electrode. In a plan view, a size of the second opening is larger than that of the first opening. The organic insulating layer exposed from the rib between the first opening and the second opening has a frame-like shape.SELECTED DRAWING: Figure 11 【課題】信頼性の低下を抑制する。【解決手段】一実施形態によれば、表示装置は、表示領域及び周辺領域に亘って配置された有機絶縁層と、前記表示領域において、前記有機絶縁層の上に配置された下電極と、無機絶縁材料で形成され、前記下電極の周縁部に重なるリブと、前記リブの上に配置され導電材料で形成された下部と、前記下部の上に配置され前記下部の側面から突出した上部と、を有する隔壁と、前記下電極の上に配置され、発光層を含む有機層と、前記有機層を覆い、前記隔壁の前記下部に接触する上電極と、前記周辺領域に配置された端子電極と、を備え、前記有機絶縁層は、前記端子電極を露出する第１開口を有し、前記リブは、前記周辺領域に延出し、前記端子電極を露出する第２開口を有し、平面視において、前記第２開口のサイズは、前記第１開口のサイズよりも大きく、前記第１開口と前記第２開口との間で前記リブから露出する前記有機絶縁層の形状は、枠状である。【選択図】図１１