Organic light emitting diode display device

An organic light emitting diode display device, comprising:

• a substrate;
• an overcoating layer on the substrate and including a plurality of convex portions and a plurality of concave portions;
• a first electrode on the overcoating layer;
• a light emitting layer having an electron transporting layer, a first emitting material layer, and a second emitting material layer over the first electrode, wherein the electron transporting layer is located between the second electrode and the first emitting material layer;
• and
• a second electrode on the light emitting layer,
• wherein the first emitting material layer in the plurality of convex portions is separated from the second electrode by a first distance,
• wherein the first emitting material layer in the plurality of concave portions is separated from the second electrode by a second distance different from the first distance,
• wherein at least one of the plurality of convex portions includes a bottom surface portion and a side surface portion,
• wherein the second emitting material layer is located between the first emitting material layer and the first electrode,
• wherein a distance from the second electrode to the second emitting material layer in the plurality of convex portions is determined by a following equation:
• L2=D2*cos θ, where θ=20°-60°, and
• where L2 is a distance from the second electrode to the second emitting material layer in the plurality of convex portions, D2 is a distance from the second electrode to the second emitting material layer in the plurality of concave portions, and θ is an angle of a tangential line of the side surface portion with respect to the bottom surface portion.