Display device

Abstract

To provide a display apparatus.SOLUTION: A display apparatus includes: a first subpixel, a second subpixel and a third subpixel which emit different color lights from each other. The display apparatus includes: a first organic light-emitting diode, a second organic light-emitting diode and a third organic light-emitting diode which are arranged on a substrate and correspond to the first subpixel, the second subpixel and the third subpixel, respectively; a first intermediate layer commonly included in the first organic light-emitting diode and the second organic light-emitting diode, the first intermediate layer including a first emission layer and a first hole transport layer; a second intermediate layer included in the third organic light-emitting diode, the second intermediate layer including a second emission layer and a second hole transport layer; and a first color converting layer, a second color converting layer, and a third color converting layer which are arranged to correspond to the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode, respectively. The first emission layer and the second emission layer emit different color lights from each other, and a hole mobility of the first hole transport layer is different from a hole mobility of the second hole transport layer.SELECTED DRAWING: Figure 4

Claims

1. In a display device including a first subpixel, a second subpixel, and a third subpixel that produce different colors from each other, Arranged on a substrate, the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode correspond to the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively. The first organic light-emitting diode and the second organic light-emitting diode are both provided with a first intermediate layer which includes a first light-emitting layer and a first hole transport layer, The third organic light-emitting diode comprises a second intermediate layer including a second light-emitting layer and a second hole transport layer, A first color conversion layer, a second color conversion layer, and a third color conversion layer are arranged to correspond to the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode, respectively. Includes, The first light-emitting layer emits a different color from the second light-emitting layer. The hole mobility of the first hole transport layer is greater than the hole mobility of the second hole transport layer. A common hole transport layer is not provided that is continuous with the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode. A display device in which no common light-emitting layer is arranged continuous with the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode.

2. The display apparatus according to claim 1, wherein the first hole transport layer is provided by doping an oxide onto an organic host, and the second hole transport layer is provided by doping the host with a p-type organic dopant.

3. The display device according to claim 2, wherein the dielectric constant of the oxide is 3 or more and 60 or less.

4. The oxide is HfOx, ZrOx, LaOx, La ２ O ３ , LaAlOx, TaOx, AlOx, Al ２ O ３ , SiO ２ , ZrSiO ４ , HfSiO ４ , SrO, Y ２ O ３ , CaO, BaO, BaZrO, MgO, TiO ２ The display device according to claim 2, comprising any one of them.

5. The display apparatus according to claim 2, wherein the doping concentration of the oxide is 0.5% or more and 30% or less.

6. The display device according to claim 2, wherein the p-type organic dopant is a cyano group-containing compound, and the doping concentration of the p-type organic dopant is 0.5% or more and 25% or less.

7. The display device according to claim 1, wherein the first hole transport layer comprises an organic host doped with an oxide at a first doping concentration, and the second hole transport layer comprises an organic host doped with the oxide at a second doping concentration, the first doping concentration being different from the second doping concentration.

8. The display apparatus according to claim 1, further comprising a bank disposed on the substrate and disposed between the first light-emitting layer and the second light-emitting layer.

9. The display apparatus according to claim 8, wherein the bank is positioned on top of the pixel defining film that defines the light-emitting regions of the first to third organic light-emitting diodes and is positioned to surround the third organic light-emitting diode.

10. The display apparatus according to claim 1, wherein the first intermediate layer further includes a first-first light-emitting layer disposed on top of the first light-emitting layer, and the second intermediate layer further includes a second-first light-emitting layer disposed on top of the second light-emitting layer.

11. The display apparatus according to claim 10, wherein the first-1 light-emitting layer is formed of the same material as the first light-emitting layer.

12. The display apparatus according to claim 1, wherein the first light-emitting layer emits green light, the second light-emitting layer emits blue light, the first hole transport layer is doped with a p-type organic dopant, and the second hole transport layer is doped with an oxide.

13. In a display device including a first subpixel, a second subpixel, and a third subpixel that produce different colors from each other, Arranged on a substrate, the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode correspond to the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively. The first organic light-emitting diode and the second organic light-emitting diode are both provided with a first intermediate layer which includes a first light-emitting layer and a first hole transport layer, The third organic light-emitting diode comprises a second intermediate layer including a second light-emitting layer and a second hole transport layer, The substrate includes a bank arranged to surround at least a portion of the second intermediate layer, The first light-emitting layer emits a different color from the second light-emitting layer. The hole mobility of the first hole transport layer is greater than the hole mobility of the second hole transport layer. A common hole transport layer is not provided that is continuous with the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode. A display device in which no common light-emitting layer is arranged continuous with the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode.

14. The display apparatus according to claim 13, wherein the first light-emitting layer emits green light and the second light-emitting layer emits blue light.

15. The display apparatus according to claim 14, wherein the first hole transport layer is provided by doping an oxide onto an organic host, and the second hole transport layer is provided by doping the host with a p-type organic dopant.

16. The aforementioned oxides are HfOx, ZrOx, LaOx, La ２ O ３ , LaAlOx, TaOx, AlOx, Al ２ O ３ SiO ２ ZrSiO ４ , HfSiO ４ SrO, Y ２ O ３ , CaO, BaO, BaZrO, MgO, TiO ２ The display device according to claim 15, comprising any one of the above.

17. The display device according to claim 15, wherein the p-type organic dopant is a cyano group-containing compound, and the doping concentration of the p-type organic dopant is 0.5% or more and 25% or less.

18. The display apparatus according to claim 13, wherein the first intermediate layer further includes a first-first light-emitting layer disposed on top of the first light-emitting layer, and the second intermediate layer further includes a second-first light-emitting layer disposed on top of the second light-emitting layer.

19. The display apparatus according to claim 18, wherein the first-1 light-emitting layer is formed of the same material as the first light-emitting layer.

20. A first sub-pixel containing a first organic light-emitting diode and emitting a first color, and a second sub-pixel containing a second organic light-emitting diode and emitting a second color, It includes a third organic light-emitting diode and a third sub-pixel that emits a third color, The first organic light-emitting diode and the second organic light-emitting diode emit light having a first wavelength, and the third organic light-emitting diode emits light having a second wavelength different from the first wavelength. The first organic light-emitting diode and the second organic light-emitting diode include a first hole transport layer that is commonly applied, and the third organic light-emitting diode includes a second hole transport layer having a hole mobility smaller than that of the first hole transport layer. A common hole transport layer is not provided that is continuous with the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode. A display device in which no common light-emitting layer is arranged continuous with the first organic light-emitting diode, the second organic light-emitting diode, and the third organic light-emitting diode.

21. The first organic light-emitting diode and the second organic light-emitting diode each include a first light-emitting layer that emits light of the first wavelength. The display apparatus according to claim 20, wherein the third organic light-emitting diode includes a second light-emitting layer that emits light of the second wavelength.

22. The first sub-pixel includes a first color conversion layer that converts light of the first wavelength into light of the first color, The second sub-pixel includes a second color conversion layer that converts light of the first wavelength into light of a second color different from the first color. The display apparatus according to claim 20, wherein the third sub-pixel includes a transmission window that transmits light of the third color having the second wavelength.

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