An organic light emitting diode device, comprising: a first electrode; a second electrode facing the first electrode; and a light emitting member disposed between the first electrode and the second electrode, wherein the light emitting member includes at least two light emitting units including a first light emitting unit and a second light emitting unit stacked on the first light emitting unit, the first and second light emitting units (EL1, EL2) each displaying a different color, wherein the first light emitting unit includes: a first hole injection layer disposed on the first electrode, a second hole injection layer disposed directly on the first hole injection layer, a first hole transport layer disposed on the second hole injection layer, a first emission layer disposed on the first hole transport layer, and a first electron transport layer disposed on the first emission layer, the difference between the HOMO energy level of the first hole injection layer and the LUMO energy level of the second hole injection layer is 0.5 eV or less, characterised in that the second light emitting unit includes: a third hole injection layer disposed on the first electron transport layer, a second hole transport layer disposed on the third hole injection layer, a second emission layer disposed on the second hole transport layer, and a second electron transport layer disposed on the second emission layer, wherein the second hole injection layer is disposed directly on the first hole injection layer throughout the entire region of the first light emitting unit, and wherein the first hole injection layer and the second hole injection layer have different compositions. a first electrode; a second electrode facing the first electrode; and a light emitting member disposed between the first electrode and the second electrode, wherein the light emitting member includes at least two light emitting units including a first light emitting unit and a second light emitting unit stacked on the first light emitting unit, the first and second light emitting units (EL1, EL2) each displaying a different color, wherein the first light emitting unit includes: a first hole injection layer disposed on the first electrode, a second hole injection layer disposed directly on the first hole injection layer, a first hole transport layer disposed on the second hole injection layer, a first emission layer disposed on the first hole transport layer, and a first electron transport layer disposed on the first emission layer, the difference between the HOMO energy level of the first hole injection layer and the LUMO energy level of the second hole injection layer is 0.5 eV or less, characterised in that the second light emitting unit includes: a third hole injection layer disposed on the first electron transport layer, a second hole transport layer disposed on the third hole injection layer, a second emission layer disposed on the second hole transport layer, and a second electron transport layer disposed on the second emission layer, wherein the second hole injection layer is disposed directly on the first hole injection layer throughout the entire region of the first light emitting unit, and wherein the first hole injection layer and the second hole injection layer have different compositions. a first hole injection layer disposed on the first electrode, a second hole injection layer disposed directly on the first hole injection layer, a first hole transport layer disposed on the second hole injection layer, a first emission layer disposed on the first hole transport layer, and a first electron transport layer disposed on the first emission layer, the difference between the HOMO energy level of the first hole injection layer and the LUMO energy level of the second hole injection layer is 0.5 eV or less, characterised in that the second light emitting unit includes: a third hole injection layer disposed on the first electron transport layer, a second hole transport layer disposed on the third hole injection layer, a second emission layer disposed on the second hole transport layer, and a second electron transport layer disposed on the second emission layer, wherein the second hole injection layer is disposed directly on the first hole injection layer throughout the entire region of the first light emitting unit, and wherein the first hole injection layer and the second hole injection layer have different compositions. wherein the second hole injection layer is disposed directly on the first hole injection layer throughout the entire region of the first light emitting unit, and wherein the first hole injection layer and the second hole injection layer have different compositions.