Display device

Patent metadata

Field	Value
Publication number	US-10916722-B2
Application number	US-201916507954-A
Country	US
Kind code	B2
Filing date	Jul 10, 2019
Priority date	Sep 17, 2018
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A display device includes first and second light emitting regions; first and second pixel electrodes in the first and second light emitting regions, respectively; a first organic layer in the first light emitting region, including first and second light emitting layers; a second organic layer in the second light emitting region, including a third light emitting layer; a common electrode on the first and second organic layers; a wavelength conversion pattern on the common electrode, overlapping the first organic layer, and wavelength-converting light of a first color into light of a second color, different from the first color; and a light transmitting pattern on the common electrode, overlapping the second organic layer. The third light emitting layer and one of the first and second light emitting layers emit light of the first color, and another one of the first and second light emitting layers emits light of the second color.

First claim

What is claimed is:

1. A display device, comprising:
a first light emitting region and a second light emitting region;
a first pixel electrode in the first light emitting region;
a second pixel electrode in the second light emitting region;
a first organic layer in the first light emitting region, the first organic layer including a first light emitting layer on the first pixel electrode and a second light emitting layer on the first light emitting layer;
a second organic layer in the second light emitting region, the second organic layer including a third light emitting layer on the second pixel electrode;
a common electrode on the first organic layer and the second organic layer;
a first wavelength conversion pattern on the common electrode, overlapping the first organic layer, and wavelength-converting light of a first color into light of a second color, different from the first color; and
a light transmitting pattern on the common electrode and overlapping the second organic layer, wherein
the third light emitting layer emits light of the first color,
one of the first light emitting layer and the second light emitting layer emits light of the first color,
another one of the first light emitting layer and the second light emitting layer emits light of the second color,
the first organic layer does not emit light of a third color having a longer peak wavelength than light of the first color and light of the second color,
the second organic layer further includes a fifth light emitting layer on the third light emitting layer and a sixth light emitting layer on fifth light emitting layer,
any one of the fifth light emitting layer and the sixth light emitting layer emits light of the first color, and
another one of the fifth light emitting layer and the sixth light emitting layer emits light of the second color.

2. The display device as claimed in claim 1 , wherein:
light of the first color has a peak wavelength in a range of 440 nm to 470 nm,
light of the second color has a peak wavelength in a range of 510 nm to 550 nm, and
light of the third color has a peak wavelength in a range of 610 nm to 670 nm.

3. The display device as claimed in claim 1 , wherein:
the first organic layer further includes a fourth light emitting layer between the second light emitting layer and the common electrode,
any one of the first light emitting layer, the second light emitting layer, and the fourth light emitting layer emits light of the second color, and
other two of the first light emitting layer, the second light emitting layer, and the fourth light emitting layer emit light of the first color.

4. The display device as claimed in claim 1 , wherein the second organic layer further includes a fifth light emitting layer between the third light emitting layer and the common electrode, and emitting light of the first color.

5. The display device as claimed in claim 1 , further comprising:
a first color filter on the first wavelength conversion pattern, overlapping the first organic layer, transmitting light of the second color and blocking light of the first color.

6. The display device as claimed in claim 5 , further comprising:
a second color filter on the light transmitting pattern, overlapping the second organic layer, transmitting the light of the first color, and blocking light of the second color and light of the third color.

7. The display device as claimed in claim 6 , further comprising:
a blocking member on a non-light emitting region between the first light emitting region and the second light emitting region, the blocking member overlapping a portion of the first color filter and of the second color filter.

8. The display device as claimed in claim 5 , further comprising:
a first low refractive index layer between the first wavelength conversion pattern and the first color filter, the first low refractive index layer having a lower refractive index than the first wavelength conversion pattern.

9. The display device as claimed in claim 8 , further comprising:
a second low refractive index layer between the first wavelength conversion pattern and the common electrode, the second low refractive index layer having a lower refractive index than the first wavelength conversion pattern.

10. The display device as claimed in claim 1 , wherein the light transmitting pattern includes:
a base resin, and
scatterers in the base resin.

11. The display device as claimed in claim 10 , wherein the light transmitting pattern transmits light of the first color, and blocks light of the second color and light of the third color.

12. The display device as claimed in claim 1 , further comprising:
an insulation layer on the common electrode;
a substrate on the insulation layer; and
a filler between the insulation layer and the substrate, the filler including an organic material.

13. A display device, comprising:
a first light emitting region and a second light emitting region;
a first pixel electrode in the first light emitting region;
a second pixel electrode in the second light emitting region;
a first organic layer in the first light emitting region, the first organic layer including a first light emitting layer on the first pixel electrode and a second light emitting layer on the first light emitting layer;
a second organic layer in the second light emitting region, the second organic layer including a third light emitting layer on the second pixel electrode;
a common electrode on the first organic layer and the second organic layer;
a first wavelength conversion pattern on the common electrode, overlapping the first organic layer, and wavelength-converting light of a first color into light of a second color, different from the first color;
a light transmitting pattern on the common electrode and overlapping the second organic layer;
an insulation layer on the common electrode;
a substrate on the insulation layer; and
a filler between the insulation layer and the substrate, the filler including an organic material, wherein
the third light emitting layer emits light of the first color,
one of the first light emitting layer and the second light emitting layer emits light of the first color,
another one of the first light emitting layer and the second light emitting layer emits light of the second color,
the first organic layer does not emit light of a third color having a longer peak wavelength than light of the first color and light of the second color, and
the first wavelength conversion pattern and the light transmitting pattern are between the substrate and the filler.

14. A display device, comprising:
a first light emitting region and a second light emitting region;
a first pixel electrode in the first light emitting region;
a second pixel electrode in the second light emitting region;
a first organic layer in the first light emitting region, the first organic layer including a first light emitting layer on the first pixel electrode and a second light emitting layer on the first light emitting layer;
a second organic layer in the second light emitting region, the second organic layer including a third light emitting layer on the second pixel electrode;
a common electrode on the first organic layer and the second organic layer;
a first wavelength conversion pattern on the common electrode, overlapping the first organic layer, and wavelength-converting light of a first color into light of a second color, different from the first color;
a light transmitting pattern on the common electrode and overlapping the second organic layer;
an insulation layer on the common electrode;
a

Assignees

• Samsung Display Co Ltd

Inventors

• Park Kyoung Won
• Kim Sung Woon
• Kim Soo Dong
• Kim Jin Won
• Nam Min Ki

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K50/19 Primary

  Tandem OLEDs · CPC title

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/877

  comprising scattering means · CPC title

• H10K50/13

  comprising stacked EL layers within one EL unit · CPC title