An electroluminescent display device comprising: a low potential voltage supply line (VSSL) disposed on a non-display area of a display panel to supply a low potential voltage to the display panel; a cathode electrode overlapped with the low potential voltage supply line (VSSL) and having at least one contact portion; an auxiliary cathode electrode including a first auxiliary cathode electrode (ACATa) and a second auxiliary cathode electrode (ACATb) overlapped with the low potential voltage supply line (VSSL) and the cathode electrode to connect the low potential voltage supply line (VSSL) to the cathode electrode, and an inorganic insulation layer covering the first auxiliary cathode electrode (ACATa); an organic insulation layer disposed on the inorganic insulation layer; wherein the inorganic insulation layer and the organic insulation layer include a first opening (OP, OP1) to expose the first auxiliary cathode electrode (ACATa); wherein the second auxiliary cathode electrode (ACATb) has a rim disposed either on the organic insulation layer or on the inorganic insulation layer; wherein if the rim of the second auxiliary cathode electrode (ACATb) is disposed on the organic insulation layer of the at least one contact portion, a bank layer is disposed between the cathode electrode and the second auxiliary cathode electrode (ACATb) to cover the rim of the second auxiliary cathode electrode (ACATb), and wherein if the rim of the second auxiliary cathode electrode (ACATb) is disposed on the inorganic insulation layer of at least one of the contact portion, the cathode electrode covers and contacts the rim of the second auxiliary cathode electrode ACATb) and the inorganic insulation layer. a low potential voltage supply line (VSSL) disposed on a non-display area of a display panel to supply a low potential voltage to the display panel; a cathode electrode overlapped with the low potential voltage supply line (VSSL) and having at least one contact portion; an auxiliary cathode electrode including a first auxiliary cathode electrode (ACATa) and a second auxiliary cathode electrode (ACATb) overlapped with the low potential voltage supply line (VSSL) and the cathode electrode to connect the low potential voltage supply line (VSSL) to the cathode electrode, and an inorganic insulation layer covering the first auxiliary cathode electrode (ACATa); an organic insulation layer disposed on the inorganic insulation layer; wherein the inorganic insulation layer and the organic insulation layer include a first opening (OP, OP1) to expose the first auxiliary cathode electrode (ACATa); wherein the second auxiliary cathode electrode (ACATb) has a rim disposed either on the organic insulation layer or on the inorganic insulation layer; wherein if the rim of the second auxiliary cathode electrode (ACATb) is disposed on the organic insulation layer of the at least one contact portion, a bank layer is disposed between the cathode electrode and the second auxiliary cathode electrode (ACATb) to cover the rim of the second auxiliary cathode electrode (ACATb), and wherein if the rim of the second auxiliary cathode electrode (ACATb) is disposed on the inorganic insulation layer of at least one of the contact portion, the cathode electrode covers and contacts the rim of the second auxiliary cathode electrode ACATb) and the inorganic insulation layer.