An OLED display device includes a substrate including red, green, and blue pixel areas, a first electrode at each of the red pixel area, the green pixel area, and the blue pixel area on the substrate, a hole transport layer on the first electrode, a light emission portion on the hole transport layer, the light emission portion including a red light emitting layer at the red pixel area, a green light emitting layer at the green pixel area, and a blue light emitting layer at the blue pixel area, a first charge generation layer and a first resonance auxiliary layer between the hole transport layer and the blue light emitting layer, a second resonance auxiliary layer between the hole transport layer and the red light emitting layer, an electron transport layer on the light emission portion, and a second electrode on the electron transport layer.