An electroluminescent display apparatus includes a substrate including a display area and a non-display area which surrounds the display area, a crack detecting unit on the substrate in the non-display area, an interlayer insulating layer disposed so as to cover the crack detecting unit, a power supply electrode which is located on the interlayer insulating layer and is disposed between the crack detecting unit and the display area, a protective layer disposed so as to cover the power supply electrode; a planarizing layer which is located on the protective layer and is disposed so as to overlap the crack detecting unit, and an alignment reference unit which is located on the planarizing layer and overlaps the crack detecting unit.