Organic electroluminescent display apparatus
An organic electroluminescent display apparatus includes: a base substrate; a first electrode; a hole transport region; a light-emitting unit; a common layer; a first resonance auxiliary layer; a second resonance auxiliary layer; an electron transport region; and a second electrode. The light-emitting unit includes a first light-emitting layer disposed on the first pixel region and a second light-emitting layer disposed on the second pixel region. The first resonance auxiliary layer and the second resonance auxiliary layer may be separated from the common layer.
1. An organic electroluminescent display apparatus comprising:
a base substrate comprising a first pixel region and a second pixel region;
a first electrode disposed on the base substrate;
a hole transport region disposed on the first electrode;
a light-emitting unit disposed on the hole transport region, and comprising a first light-emitting layer disposed on the first pixel region and a second light-emitting layer disposed on the second pixel region;
a common layer disposed between the light-emitting unit and the hole transport region;
a first resonance auxiliary layer disposed on the first pixel region, and disposed between the common layer and the hole transport region;
a second resonance auxiliary layer disposed on the second pixel region, and disposed between the second light-emitting layer and the common layer;
an electron transport region disposed on the light-emitting unit; and
a second electrode disposed on the electron transport region.
2. The organic electroluminescent display apparatus of claim 1 , wherein the light-emitting unit further comprises a third light-emitting layer disposed on a third pixel region of the base substrate, and the third light-emitting layer is configured to emit light having a wavelength different from each of a wavelength of light emitted from the first light-emitting layer and a wavelength of light emitted from the second light-emitting layer.
3. The organic electroluminescent display apparatus of claim 2 , wherein the first light-emitting layer is configured to emit red light, the second light-emitting layer is configured to emit green light, and the third light-emitting layer is configured to emit blue light.
4. The organic electroluminescent display apparatus of claim 2 , wherein the first light-emitting layer is configured to emit green light, the second light-emitting layer is configured to emit red light, and the third light-emitting layer is configured to emit blue light.
5. The organic electroluminescent display apparatus of claim 1 , wherein at least one layer selected from the first resonance auxiliary layer and the second resonance auxiliary layer comprises a p-type doped layer.
6. The organic electroluminescent display apparatus of claim 5 , wherein the p-type doped layer is disposed adjacent to the hole transport region.
7. The organic electroluminescent display apparatus of claim 5 , wherein the p-type doped layer is spaced from the light-emitting unit.
8. The organic electroluminescent display apparatus of claim 1 , wherein the common layer has a lowest unoccupied molecular orbital (LUMO) energy level higher than a LUMO energy level of a host material of the light-emitting unit, and the common layer has a highest occupied molecular orbital (HOMO) energy level lower than a HOMO energy level of the hole transport region.
9. The organic electroluminescent display apparatus of claim 1 , wherein the first resonance auxiliary layer and the second resonance auxiliary layer have different thicknesses, and a resonance distance between the first electrode and the second electrode is adjusted by the first resonance auxiliary layer, the second resonance auxiliary layer, and the common layer.