Organic light-emitting display device

Patent metadata

Field	Value
Publication number	US-10256438-B2
Application number	US-201615338869-A
Country	US
Kind code	B2
Filing date	Oct 31, 2016
Priority date	Oct 31, 2015
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

An organic light-emitting display (OLED) device is disclosed that includes: a red organic light-emitting diode comprising a red organic emission layer; a green organic light-emitting diode comprising a green organic emission layer; and a blue organic light-emitting diode comprising a blue organic emission layer. The difference between a peak of a photoluminescence spectrum of the red organic emission layer and a peak of an electroluminescence spectrum of the red organic light-emitting diode is less than 2 nm, the difference between a peak of a PL spectrum of the green organic emission layer and a peak of an EL spectrum of the green organic light-emitting diode is less than 2 nm, and the difference between a peak of a PL spectrum of the blue organic emission layer and a peak of an EL spectrum of the blue organic light-emitting diode is 4 nm or greater.

First claim

What is claimed is:

1. An organic light-emitting display (OLED) device, comprising:
a red organic light-emitting diode having a first optical distance;
a green organic light-emitting diode having a second optical distance that is shorter than the first optical distance; and
a blue organic light-emitting diode having a third optical distance that is shorter than the second optical distance;
wherein a color viewing angle distance of blue light (blue Δu′v′@0° to 60°) is greater than a color viewing angle distance of red light (red Δu′v′@0° to 60°) and a color viewing angle distance of green light (green Δu′v′@0° to 60°), respectively, and
wherein a color viewing angle distance of white light (white Δu′v′@0° to 60°) is less than the color viewing angle distance of blue light (blue Δu′v′@0° to 60°).

2. The OLED device of claim 1 , wherein the color viewing angle distance of white light (white Δu′v′@0° to 60°) is 0.032 or less, and the color viewing angle distance of blue light (blue Δu′v′@0° to 60°) is greater than 0.032.

3. The OLED device of claim 2 , wherein a difference (ΔLB) between a peak of a photoluminescence (PL) spectrum of a blue organic emission layer (B_PLλ max ) and a peak of an electroluminescence (EL) spectrum of the blue organic light-emitting diode (B_ELλ max ) is greater than a difference (ΔLG) between a peak of a photoluminescence (PL) spectrum of a green organic emission layer (G_PLλ max ) and a peak of an electroluminescence (EL) spectrum of the green organic light-emitting diode (G_ELλ max ).

4. The OLED device of claim 3 , wherein the difference (ΔLB) between the peak of the photoluminescence (PL) spectrum of the blue organic emission layer (B_PLλ max ) and the peak of an electroluminescence (EL) spectrum of the blue organic light-emitting diode (B_ELλ max ) is greater than a difference (ΔLR) between a peak of a photoluminescence (PL) spectrum of a red organic emission layer (R_PLλ max ) and a peak of an electroluminescence (EL) spectrum of the red organic light-emitting diode (R_ELλ max ).

5. The OLED device of claim 4 ,
wherein the difference (ΔLB) between the peak of the photoluminescence (PL) spectrum of the blue organic emission layer (B_PLλ max ) and the peak of the electroluminescence (EL) spectrum of the blue organic light-emitting diode (B_ELλ max ) is between 4 nm and 8 nm,
wherein the difference (ΔLG) between the peak of the photoluminescence (PL) spectrum of the green organic emission layer (G_PLλ max ) and the peak of the electroluminescence (EL) spectrum of the green organic light-emitting diode (G_ELλ max ) is less than 2 nm, and
wherein the difference (ΔLR) between the peak of the photoluminescence (PL) spectrum of the red organic emission layer (R_PLλ max ) and the peak of the electroluminescence (EL) spectrum of the red organic light-emitting diode (R_ELλ max ) is less than 2 nm.

6. The OLED device of claim 1 , wherein the OLED device is configured to reduce the color viewing angle distance of white light (white Δu′v′@0° to 60°) by increasing the color viewing angle distance of blue light (blue Δu′v′@0° to 60°) to be larger than the color viewing angle distance of white light (white Δu′v′@0° to 60°).

7. The OLED device of claim 6 , wherein the color viewing angle distance of blue light (blue Δu′v′@0° to 60°) is determined to be the largest among the color viewing angle distances of red light (red Δu′v′@0° to 60°), green light (green Δu′v′@0° to) 60°, blue light (blue Δu′v′@0° to 60°), and white light (white Δu′v′@0° to 60°).

8. The OLED device of claim 1 , wherein the third optical distance is adjusted by more than 40 Å from a half of the peak of the photoluminescence (PL) spectrum of the blue organic emission layer (B_PLλ max ) of the blue organic light-emitting diode.

9. The OLED device of claim 8 , wherein the difference (ΔLB) between the peak of the photoluminescence (PL) spectrum of the blue organic emission layer (B_PLλ max ) and the peak of an electroluminescence (EL) spectrum of the blue organic light-emitting diode (B_ELλ max ) is more than 4 nm.

10. The OLED device of claim 3 , further comprising:
a common hole transport layer with respect to the red, green and blue organic light-emitting diodes, a red hole transport layer between the common hole transport layer and the red organic emission layer, and a green hole transport layer between the common hole transport layer and the green organic emission layer,
wherein the first optical distance is adjusted by a thickness of the common hole transport layer and a thickness of the red hole transport layer,
wherein the difference (ΔLR) between the peak of the photoluminescence (PL) spectrum of the red organic emission layer (R_PLλ max ) and the peak of the electroluminescence (EL) spectrum of the red organic light-emitting diode (R_ELλ max ) is less than 2 nm,
wherein the second optical distance is adjusted by the thickness of the common hole transport layer and a thickness of the green hole transport layer,
wherein the difference (ΔLG) between the peak of the photoluminescence (PL) spectrum of the green organic emission layer (G_PLλ max ) and the peak of the electroluminescence (EL) spectrum of the green organic light-emitting diode (G_ELλ max ) is less than 2 nm, and
wherein the third optical distance is adjusted by the thickness of the common hole transport layer,
wherein the difference (ΔLB) between the peak of the photoluminescence (PL) spectrum of the blue organic emission layer (B_PLλ max ) and the peak of the electroluminescence (EL) spectrum of the blue organic light-emitting diode (B_ELλ max ) is between 4 nm and 8 nm.

11. An organic light-emitting display (OLED) device, comprising:
a red organic light-emitting diode having a first optical distance comprising:
a first anode electrode;
a red organic emission layer on the first anode electrode; and
a cathode electrode on the red organic emission layer;

a green organic light-emitting diode having a second optical distance shorter than the first optical distance comprising:
a second anode electrode;
a green organic emission layer on the second anode electrode; and
the cathode electrode on the green organic emission layer; and

a blue organic light-emitting diode having a third optical distance shorter than the second optical distance comprising:
a third anode electrode;
a blue organic emission layer on the third anode electrode; and
the cathode electrode on the blue organic emission layer;

wherein the first optical distance is a distance between a top surface of the first anode electrode and a bottom surface of the cathode electrode, the first optical distance is determined by a half of a value of a photoluminescence (PL) spectrum of the red organic emission layer (R_PLλ max ),
wherein the second optical distance is a distance between a top surface of the second anode electrode and the bottom surface of the cathode electrode, the second optical distance is determined by a half of a value of a PL spectrum of the green organic emission layer (G_PLλ max ), and
wherein the third optical distance is a distance between a top surface of the third anode electrode and the bottom surface of the cathode electrode, the third optical distance is adjusted more than 40 Å from a half of a value of a peak of a PL spectrum of the blue organic emission layer (B_PLλ max ),
wherein a difference (ΔLB) between the peak of the PL spectrum of the blue organic emission layer (B_PLλ max ) and a peak of an EL spectrum of the blue organic light-emitting diode (B_ELλ max ) is between 4 nm and 8 nm.

12. The OLED device of claim 11 , wherein a color viewing angle distance of blue light (blue Δu′v′@0° to 60°) is greater than a

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kwanghyun
• Park Jinho

Classifications

• H01L51/5253

  Electricity · mapped topic

• H01L51/5072

  Electricity · mapped topic

• H01L51/5218

  Electricity · mapped topic

• H01L51/5234

  Electricity · mapped topic

• H01L51/5265 Primary

  Electricity · mapped topic