An organic light emitting display device including a substrate, a semiconductor device disposed on the substrate, an insulation layer including an inclined structure disposed on the semiconductor device, a first electrode disposed on the insulation layer, a pixel defining layer disposed on the insulation layer and the first electrode, the pixel defining layer having a pixel opening exposing the first electrode positioned on the inclined structure, an organic light emitting layer disposed on the exposed first electrode and the pixel defining layer, and a second electrode disposed on the organic light emitting layer and the pixel defining layer. Light generated from the organic light emitting layer may be directed in different directions by the inclined structure.