Display device

Patent metadata

Field	Value
Publication number	US-11139348-B2
Application number	US-201916674050-A
Country	US
Kind code	B2
Filing date	Nov 5, 2019
Priority date	Nov 27, 2018
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

A display device is provided. The display device includes a substrate; a light-emitting layer providing first light having a first wavelength; and a light converter disposed on the light-emitting layer, wherein the plurality of pixels include first, second, third, and fourth pixels which includes first and second subpixels, the light converter includes a first wavelength conversion layer and a second wavelength conversion layer disposed in the first pixel and the second pixel, respectively, a light-transmitting layer disposed in the third pixel, and a third wavelength conversion layer disposed in the first subpixel, the first wavelength conversion layer and the second wave length conversion layer include a first wavelength conversion material and a second wavelength conversion material which convert the first light into light having different wavelength, respectively, the third wavelength conversion layer includes the first and second wavelength conversion materials.

First claim

What is claimed is:

1. A display device comprising:
a substrate including a plurality of pixel regions on which a plurality of pixels are disposed;
a light-emitting layer disposed on the substrate and providing first light having a first wavelength; and
a light converter disposed on the light-emitting layer and receiving the first light,
wherein
the plurality of pixels include first, second, third, and fourth pixels,
the fourth pixel includes first and second subpixels,
the light converter includes a first wavelength conversion layer which is disposed in the first pixel, a second wavelength conversion layer which is disposed in the second pixel, a light-transmitting layer which is disposed in the third pixel, a third wavelength conversion layer which is disposed in the first subpixel, and a color filter layer which is disposed in the third pixel and the second subpixel, and includes a color filter transmitting the first light therethrough,
the first wavelength conversion layer includes a first wavelength conversion material which converts the first light into second light having a second wavelength that is longer than the first wavelength,
the second wavelength conversion layer includes a second wavelength conversion material which converts the first light into third light having a third wavelength that is longer than the first wavelength, and
the third wavelength conversion layer includes the first and second wavelength conversion materials.

2. The display device of claim 1 , wherein
the color filter layer further includes a first color filter which transmits the second light therethrough and a second color filter which transmits the third light therethrough,
the first color filter is disposed in the first pixel, and
the second color filter is disposed in the second pixel.

3. The display device of claim 2 , wherein the color filter disposed in the third pixel and the second subpixel are connected to each other to form single color filter.

4. The display device of claim 3 , wherein
the light converter further includes a black matrix which is disposed at boundaries between the plurality of pixels except a boundary between the third pixel and the second subpixel.

5. The display device of claim 2 , further comprising:
a light-transmitting resin disposed in the first subpixel, on the color filter.

6. The display device of claim 5 , wherein the light-transmitting resin includes scatterers.

7. The display device of claim 6 , wherein the light-transmitting resin includes a blue colorant.

8. The display device of claim 5 , further comprising:
a light-reflecting layer disposed in the second subpixel, on the color filter,
wherein the light-reflecting layer includes an organic material or a metal.

9. The display device of claim 2 , wherein the fourth pixel is configured to realize neutral black reflection for external light.

10. The display device of claim 2 , wherein the plurality of pixels are configured to realize neutral black reflection for external light.

11. The display device of claim 1 , wherein
the first light is blue light,
the second light is red light,
the third light is green light, and
light transmitted through the first subpixel includes a blue-light component, a red-light component, and a green-light component.

12. The display device of claim 11 , wherein the light-emitting layer is disposed in the first pixel, the second pixel, the third pixel, and the first subpixel.

13. The display device of claim 12 , wherein the light-emitting layer is not disposed in the second subpixel.

14. The display device of claim 13 , wherein
an intensity of the blue-light component of the light transmitted through the first subpixel is less than intensities of the red-light component and the green-light component of the light transmitted through the first subpixel.

15. The display device of claim 12 , wherein the light-emitting layer is further disposed in the second subpixel.

16. The display device of claim 15 , wherein
light transmitted through the second subpixel is blue light, and
an intensity of the blue-light component of the light transmitted through the second subpixel is greater than an intensity of the blue-light component of the light transmitted through the first subpixel.

17. The display device of claim 16 , wherein portions of the light-emitting layer disposed in the first and second subpixels are connected to each other.

18. The display device of claim 1 , wherein a content of the second wavelength conversion material in the third wavelength conversion layer is greater than a content of the first wavelength conversion material in the third wavelength conversion layer.

19. The display device of claim 1 , wherein
the third wavelength conversion layer includes a first wavelength conversion material layer which includes the first wavelength conversion material and a second wavelength conversion material layer which is disposed on the first wavelength conversion material layer and includes the second wavelength conversion material, and
the first wavelength conversion material layer is disposed closer to the light-emitting layer than the second wavelength conversion material layer.

20. A display device comprising:
a first pixel;
a second pixel;
a third pixel; and
a fourth pixel,
wherein
the first, second, third, and fourth pixels are sequentially arranged adjacent to one another in a first direction,
the fourth pixel includes first and second subpixels arranged in a second direction which is perpendicular to the first direction,
one of the first and second pixels is a red pixel including a red color filter and the other pixel is a green pixel including a green color filter,
the third pixel is a blue pixel including a blue color filter,
each of the first pixel, the second pixel, the third pixel, and the first subpixel includes a light-emitting layer emitting blue light,
one of the first and second pixels includes a first wavelength conversion layer which includes a first wavelength conversion material that converts the blue light into red light and the other pixel includes a second wavelength conversion layer which includes a second wavelength conversion material that converts the blue light into green light,
the first subpixel includes a third wavelength conversion layer, which includes the first and second wavelength conversion materials, and
the second subpixel includes the blue color filter.

21. The display device of claim 20 , wherein the first subpixel emits the red light, the green light and the blue light.

22. The display device of claim 21 , wherein the blue color filter of the second subpixel does not overlap with the light-emitting layer.

23. The display device of claim 20 , wherein the second subpixel includes the light-emitting layer.

24. The display device of claim 23 , wherein mixed light of light emitted from the first subpixel and light emitted from the second subpixel is white light.

25. A display device comprising:
a substrate including a plurality of pixel regions on which a plurality of pixels are disposed;
a light-emitting layer disposed on the substrate and providing first light having a first wavelength; and
a light converter disposed on the light-emitting layer and receiving the first light,
wherein
the plurality of pixels include first, second, third, and fourth pixels,
the light converter includes a first wavelength conversio

Assignees

• Samsung Display Co Ltd

Inventors

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

Classifications

• H10K59/878

  comprising reflective means · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/351 Primary

  comprising more than three subpixels, e.g. red-green-blue-white [RGBW] · CPC title

• H01L51/5271

  Electricity · mapped topic