a substrate including a display area and a non-display area;

a black pixel defining layer disposed in the display area;

a light emitting element disposed in the display area;

an encapsulation layer covering the light emitting element; and

a dam disposed in the non-display area and surrounding the display area, wherein the dam includes a plurality of organic layers, the plurality of organic layers including an organic layer having an upper surface facing the encapsulation layer, and the upper surface of the organic layer includes a portion which decreases and then increases in height toward an edge defining a side surface of the organic layer, which connects with the upper surface of the organic layer, and

wherein the dam includes a first organic layer and a second organic layer, an entirety of the second organic layer directly covers and is directly in contact with an upper surface and an outermost side surface of the first organic layer, the second organic layer consists of a single layer, and the second organic layer includes a same material as a material of the black pixel defining layer,

wherein the second organic layer includes a first portion adjacent to the edge and a second portion disposed inside the first portion, and

wherein a height of the first portion from a surface of the substrate is greater than a height of the second portion from the surface of the substrate by a height difference in a range from 0.3 μm to 0.5 μm.