Display device

Patent metadata

Field	Value
Publication number	US-11069751-B2
Application number	US-201916668699-A
Country	US
Kind code	B2
Filing date	Oct 30, 2019
Priority date	Nov 1, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A display device including a light source including a first electrode having a light reflectance for a first light of greater than or equal to about 60%; an organic light emitting layer disposed on the first electrode and emitting the first light; and a second electrode disposed on the organic light emitting layer and having a light transmittance in a visible wavelength region of greater than or equal to about 70%, wherein the light source has a first absorption peak in a wavelength region of about 650 nanometers (nm) to about 750 nm or a second absorption peak in a wavelength region of about 550 nm to about 600 nm at a viewing angle of about 55 degrees to about 85 degrees, and a color filter layer disposed above the light source and including a quantum dot configured to convert the first light into a second light.

First claim

What is claimed is:

1. A method of forming a display device, the method comprising
forming a light source comprising
disposing an organic light emitting layer on a first electrode, the organic light emitting layer emitting a first light, the first electrode having a light reflectance for the first light of greater than or equal to about 60%
disposing a second electrode on the organic light emitting layer to form the light source, the second electrode having a light transmittance in a visible wavelength region of greater than or equal to about 70%,
wherein the light source has a first absorption peak in a wavelength region of about 650 nanometers to about 750 nanometers or a second absorption peak in a wavelength region of about 550 nanometers to about 600 nanometers at a viewing angle of about 55 degrees to about 85 degrees; and

disposing a color filter layer above the light source to form the display device, the color filter layer comprising a quantum dot configured to convert the first light into a second light.

2. A display device, comprising
a light source comprising
a first electrode having a light reflectance for a first light of greater than or equal to about 60%,
an organic light emitting layer disposed on the first electrode, the organic light emitting layer emitting the first light, and
a second electrode disposed on the organic light emitting layer, the second electrode having a light transmittance in a visible wavelength region of greater than or equal to about 70%,
wherein the light source has a first absorption peak in a wavelength region of about 650 nanometers to about 750 nanometers or a second absorption peak in a wavelength region of about 550 nanometers to about 600 nanometers at a viewing angle of about 55 degrees to about 85 degrees; and
a color filter layer disposed above the light source, the color filter layer comprising a quantum dot configured to convert the first light into a second light.

3. The display device of claim 2 , wherein
the first pixel area, the second pixel area, and the third pixel area are defined in the organic light emitting layer, and
the color filter layer comprises a first color filter, a second color filter, and a third color filter at positions which overlap with the first color filter, the second color filter, and the third pixel area, respectively.

4. The display device of claim 2 , wherein
the color filter layer further comprises a quantum dot configured to convert the first light into a third light different from the second light,
a center wavelength of the second light is less than a center wavelength of the first absorption peak, and
a center wavelength of the third light is less than a center wavelength of the second absorption peak.

5. The display device of claim 2 , wherein the first electrode comprises silver (Ag), aluminum (Al), gallium (Ga), indium (In), gold (Au), platinum (Pt), nickel (Ni), tungsten (W), chromium (Cr), molybdenum (Mo), iron (Fe), cobalt (Co), copper (Cu), palladium (Pd), titanium (Ti), indium tin oxide (ITO), or a combination thereof.

6. The display device of claim 3 , wherein the second color filter comprises the quantum dot configured to convert the first light into the second light, and
the third color filter comprises a quantum dot configured to convert the first light into a third light different from the second light.

7. The display device of claim 2 , wherein
a first pixel area, a second pixel area, and a third pixel area are defined in the organic light emitting layer, and
each of the first pixel area, the second pixel area, and the third pixel area emits the first light.

8. The display device of claim 2 , wherein the quantum dot comprises a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, a Group IV compound, a Group II-III-VI compound, a Group I-II-IV-VI compound, or a combination thereof.

9. The display device of claim 2 , wherein the light source exhibits a radiance decrease of less than or equal to about 20% at a viewing angle of greater than 0 degree and less than or equal to about 40 degrees.

10. The display device of claim 2 , wherein an effective absorption with respect to the second light of the light source is less than or equal to about 20%.

11. The display device of claim 2 , wherein the first light has a center wavelength in a wavelength region of about 440 nanometers to about 550 nanometers.

12. The display device of claim 2 , wherein a center wavelength of the second light is less than a center wavelength of the second absorption peak.

13. The display device of claim 2 , wherein a center wavelength of the second light is less than a center wavelength of the first absorption peak.

14. The display device of claim 2 , wherein the color filter layer further comprises a light scattering material.

15. The display device of claim 2 , wherein the first light is blue light and the second light is red light.

16. The display device of claim 15 , wherein the color filter layer further comprises a quantum dot configured to convert the first light into green light.

17. The display device of claim 2 , wherein the display device is disposed between the second electrode and the color filter layer and further comprises a light-focusing layer configured to focus the first light emitted from the organic light emitting layer into the color filter layer.

18. The display device of claim 17 , wherein the light-focusing layer comprises a convex lens, a micro prism, a plane lens, a Fresnel lens, a metamaterial, or a combination thereof.

19. The display device of claim 18 , wherein
a first pixel area, a second pixel area, and a third pixel area are defined in the organic light emitting layer, and
the light-focusing layer comprises a first light-focusing portion, a second light-focusing portion, and a third light-focusing portion at positions overlapping the first pixel area, the second pixel area, and the third pixel area, respectively.

20. The display device of claim 2 , wherein the display device further comprises an optical filter layer disposed on the color filter layer, the optical filter layer configured to block at least a portion of the first light.

21. The display device of claim 20 , wherein optical filter layer blocks light having a wavelength of less than or equal to about 500 nanometers.

22. The display device of claim 20 , wherein
a first pixel area, a second pixel area, and a third pixel area are defined in the organic light emitting layer, and
the optical filter layer is disposed at a position overlapping the second pixel area, a position overlapping the third pixel area, or a combination thereof.

23. The display device of claim 22 , wherein the optical filter layer is integrally formed at positions other than the position overlapping the first pixel area.

Assignees

• Samsung Electronics Co Ltd
• Samsung Display Co Ltd
• Samsung Sdi Co Ltd

Inventors

• Kim Tae Gon
• Lee Sung Hun
• Kim Ji Whan
• Jun Shin Ae
• Chung Deukseok

Classifications

• H10K59/879

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

• H10K59/878

  comprising reflective means · CPC title

• H10K59/877

  comprising scattering means · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title