Organic light-emitting diode display device

Patent metadata

Field	Value
Publication number	US-10170521-B2
Application number	US-201615363915-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Dec 30, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

An organic light-emitting diode display device according to an embodiment includes a substrate on which red, green and blue sub-pixel regions are defined, first electrodes in the red, green and blue sub-pixel regions, respectively, and first, second and third light-emitting layers on the first electrodes in the red, green and blue sub-pixel regions, respectively. The organic light-emitting diode display device further includes a second electrode on the first, second and third light-emitting layers, and red, green and blue color filters disposed on the second electrode and corresponding to the red, green and blue sub-pixel regions, respectively, wherein a thickness of the first light-emitting layer is smaller than a thickness of the second light emitting layer.

First claim

What is claimed is:

1. An organic light-emitting diode display device comprising:
a substrate on which red, green and blue sub-pixel regions are defined;
a first electrode in the red, green and blue sub-pixel regions, respectively;
first, second and third light-emitting layers on the first electrode in the red, green and blue sub-pixel regions, respectively;
a second electrode on the first, second and third light-emitting layers; and
red, green and blue color filters on the second electrode and corresponding to the red, green and blue sub-pixel regions, respectively,
wherein a thickness of the first light-emitting layer is smaller than a thickness of the second light emitting layer, and
wherein a thickness of the third light-emitting layer is smaller than the thickness of the first light-emitting layer.

2. The display device of claim 1 , wherein the third light-emitting layer includes a blue light-emitting material.

3. The display device of claim 1 , wherein each of the first and second light-emitting layers includes a yellow light-emitting material.

4. The display device of claim 3 , wherein the yellow light-emitting material has a first emission peak within a wavelength range of 530 nm to 555 nm and a second emission peak within a wavelength range of 590 nm to 620 nm.

5. The display device of claim 3 , wherein the yellow light-emitting material includes 4,4′-N,N′-dicarbazole-biphenyl (CBP) and also includes bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2′]iridium(acetylactonate)[(t-bt)2Ir(acac)] as a dopant.

6. The display device of claim 1 , wherein each of the first and second light-emitting layers includes a hole auxiliary layer, a light-emitting material layer and an electron auxiliary layer, and
wherein a thickness of the hole auxiliary layer of the first light-emitting layer is smaller than a thickness of the hole auxiliary layer of the second light-emitting layer.

7. The display device of claim 6 , wherein the thickness of the hole auxiliary layer of the first light-emitting layer corresponds to a second order cavity condition, and the thickness of the hole auxiliary layer of the second light-emitting layer corresponds to a third order cavity condition.

8. The display device of claim 6 , wherein the thickness of the hole auxiliary layer of the first light-emitting layer is 250 nm to 280 nm, and the thickness of the hole auxiliary layer of the second light-emitting layer is 310 nm to 330 nm.

9. The display device of claim 2 , wherein the third light-emitting layer includes a hole auxiliary layer, a light-emitting material layer and an electron auxiliary layer, and
wherein a thickness of the hole auxiliary layer of the third light-emitting layer is smaller than the thickness of the hole auxiliary layer of the first light-emitting layer.

10. The display device of claim 9 , wherein the thickness of the hole auxiliary layer of the third light-emitting layer is 30 nm to 70 nm.

11. The display device of claim 1 , wherein a bank layer of an insulating material is disposed on the first electrode, the bank layer has an opening exposing the first electrode, and covers edges of the first electrode, each of the first, second and third light-emitting layers is formed on the first electrode exposed by the opening of the bank layer.

12. The display device of claim 11 , wherein the bank layer has a single-layered structure or a double-layered structure.

13. The display device of claim 11 , wherein the bank layer includes a first bank and a second bank on the first bank, and the first bank has a wider width than the second bank.

14. The display device of claim 13 , wherein the first bank is formed of an inorganic insulating material or organic insulating material having a hydrophilic property, and the second bank is formed of an organic insulating material having a hydrophobic property.

15. An organic light-emitting diode display device comprising:
a substrate on which red, green and blue sub-pixel regions are defined;
a first electrode in each of the red, green and blue sub-pixel regions;
first, second and third light-emitting layers on the first electrodes in the red, green and blue sub-pixel regions, respectively, each of the first and second light-emitting layers including a yellow light-emitting material having a first emission peak and a second emission peak different from the first emission peak;
a second electrode on the first, second and third light-emitting layers; and
red, green and blue color filters on the second electrode and corresponding to the red, green and blue sub-pixel regions, respectively.

16. The display device of claim 15 , wherein the third light-emitting layer includes a blue light-emitting material, a thickness of the first light-emitting layer is smaller than a thickness of the second light emitting layer, and a thickness of the third light-emitting layer is smaller than the thickness of the first light-emitting layer.

17. The display device of claim 15 , wherein the yellow light-emitting material has the first emission peak within a wavelength range of 530 nm to 555 nm and the second emission peak within a wavelength range of 590 nm to 620 nm.

18. The display device of claim 15 , wherein the yellow light-emitting material includes 4,4′-N,N′-dicarbazole-biphenyl (CBP) and also includes bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2′]iridium(acetylactonate)[(t-bt)2Ir(acac)] as a dopant.

19. The display device of claim 15 , wherein each of the first and second light-emitting layers includes a hole auxiliary layer, a light-emitting material layer and an electron auxiliary layer, and
wherein a thickness of the hole auxiliary layer of the first light-emitting layer is smaller than a thickness of the hole auxiliary layer of the second light-emitting layer.

20. An organic light-emitting diode display device comprising:
a substrate on which red, green and blue sub-pixel regions are defined;
a first electrode in the red, green and blue sub-pixel regions, respectively;
first, second and third light-emitting layers on the first electrode in the red, green and blue sub-pixel regions, respectively;
a second electrode on the first, second and third light-emitting layers; and
red, green and blue color filters on the second electrode and corresponding to the red, green and blue sub-pixel regions, respectively,
wherein a thickness of the first light-emitting layer is smaller than a thickness of the second light emitting layer, and
wherein each of the first and second light-emitting layers includes a yellow light-emitting material.

Assignees

• Lg Display Co Ltd

Inventors

• Jung Nack-Youn
• Baek Heume-Il
• Joo Myung-O
• Choi Jeong-Mook
• Jo Yun-Joo

Classifications

• H01L27/3246

  Electricity · mapped topic

• H01L27/3211

  Electricity · mapped topic

• H01L27/322

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• G02F2001/136222

  Physics · mapped topic