An organic light emitting diode display comprising: a substrate ; and a plurality of red organic light emitting diodes , green organic light emitting diodes , and blue organic light emitting diodes on the substrate, each of the plurality of red organic light emitting diodes, green organic light emitting diodes, and blue organic light emitting diodes comprising: a first electrode on the substrate, the first electrode including a reflective layer ; an organic layer on the first electrode; and a second electrode on the organic layer, wherein the organic layer comprises a light emission auxiliary layer on the first electrode, an organic light emitting layer on the light emission auxiliary layer, and a hole transport layer between the first electrode and the light emission auxiliary layer, and wherein the hole transport layer is common for the red, green and blue organic light emitting diodes, wherein a distance between an upper surface of the reflective layer of the first electrode and a lower surface of the second electrode in each of the red organic light emitting diodes corresponds to a first resonance of red light inside each of the red organic light emitting diodes, characterized in that the organic layer of each of the red organic light emitting diodes has a thickness of 90 and 110 nm, the light emission auxiliary layer of each of the red organic light emitting diodes has a thickness of 10 nm or less, and the organic layer of each of the blue organic light emitting diodes has a thickness of about 60 to 70 nm. a substrate ; and a plurality of red organic light emitting diodes , green organic light emitting diodes , and blue organic light emitting diodes on the substrate, each of the plurality of red organic light emitting diodes, green organic light emitting diodes, and blue organic light emitting diodes comprising: a first electrode on the substrate, the first electrode including a reflective layer ; an organic layer on the first electrode; and a second electrode on the organic layer, a first electrode on the substrate, the first electrode including a reflective layer ; an organic layer on the first electrode; and a second electrode on the organic layer, wherein the organic layer comprises a light emission auxiliary layer on the first electrode, an organic light emitting layer on the light emission auxiliary layer, and a hole transport layer between the first electrode and the light emission auxiliary layer, and wherein the hole transport layer is common for the red, green and blue organic light emitting diodes, wherein a distance between an upper surface of the reflective layer of the first electrode and a lower surface of the second electrode in each of the red organic light emitting diodes corresponds to a first resonance of red light inside each of the red organic light emitting diodes, characterized in that the organic layer of each of the red organic light emitting diodes has a thickness of 90 and 110 nm, the light emission auxiliary layer of each of the red organic light emitting diodes has a thickness of 10 nm or less, and the organic layer of each of the blue organic light emitting diodes has a thickness of about 60 to 70 nm. <EOS>