Organic light emitting diode display

An organic light emitting diode display, comprising:

• a first electrode arranged on a substrate;
• an organic emission layer arranged on the first electrode;
• and
• a second electrode arranged on the organic emission layer, wherein the first electrode includes a first layer, a second layer and a third layer stacked sequentially on the organic emission layer, the second layer has a higher work function than that of the third layer, wherein the first layer has a higher work function than the second layer, and wherein the second layer is thinner than each of the first layer and the third layer, wherein the first electrode further comprises a fourth layer arranged on the third layer, the first layer includes indium tin oxide (ITO), the second layer comprises a material selected from a group consisting of silver (Ag), molybdenum (Mo), tungsten (W), nickel (Ni) and platinum (Pt), the third layer includes aluminum (Al), and the fourth layer includes a different conductive material than that of the third layer.

An organic light emitting diode display, comprising:

• a first electrode arranged on a substrate;
• an organic emission layer arranged on the first electrode;
• and
• a second electrode arranged on the organic emission layer,
• wherein the first electrode includes a first layer, a second layer, a third layer and a fourth layer stacked sequentially on the organic emission layer, wherein the second layer has a work function in between the work function of the third layer and the work function of the first layer, wherein the third layer comprises aluminum (Al) and the second layer comprises a material selected from a group consisting of silver (Ag), molybdenum (Mo), tungsten (W), nickel (Ni) and platinum (Pt).