Display device

Patent metadata

Field	Value
Publication number	US-10818820-B2
Application number	US-201916352706-A
Country	US
Kind code	B2
Filing date	Mar 13, 2019
Priority date	Apr 13, 2018
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A display device includes: a substrate including a display region and a non-display region; a plurality of pixels provided in the display region, the plurality of pixels including first to third sub-pixels each having a light emitting region configured to light; a first light emitting element that is provided in each of the first and second sub-pixels and emits first color light, and a second light emitting element that is provided in the third sub-pixel and emits second color light; and a color conversion layer corresponding to each of the first and second sub-pixels, the color conversion layer converting the first color light into light of a set color for each corresponding sub-pixel.

First claim

What is claimed is:

1. A display device comprising:
a substrate comprising a display region and a non-display region;
a plurality of pixels provided in the display region, the plurality of pixels comprising first to third sub-pixels each having a light emitting region configured to emit light;
a first light emitting element that is provided in each of the first and second sub-pixels and is configured to emit a first color light, and a second light emitting element that is provided in the third sub-pixel and is configured to emit a second color light different from the first color light; and
a color conversion layer disposed on the first and second light emitting elements, the color conversion layer being configured to convert the first color light into light of a set color for each corresponding sub-pixel.

2. The display device of claim 1 , wherein the first color light comprises a first blue-based light and the second color light comprises a second blue-based light different from the first blue-based light, and the first blue-based light has a wavelength shorter than that of the second blue-based light.

3. The display device of claim 2 , wherein the color conversion layer comprises:
a first color conversion pattern corresponding to the first sub-pixel, the first color conversion pattern being configured to convert the first color light into red light;
a second color conversion pattern corresponding to the second sub-pixel, the second color conversion pattern being configured to convert the first color light into green light; and
a light blocking pattern provided between the first color conversion pattern and the second color conversion pattern.

4. The display device of claim 3 , wherein the first color conversion pattern comprises a red quantum dot, and the second color conversion pattern comprises a green quantum dot.

5. The display device of claim 3 , wherein the color conversion layer further comprises a third color conversion pattern that corresponds to the third sub-pixel and is configured to allow the second color light to be transmitted therethrough.

6. The display device of claim 5 , wherein the third color conversion pattern comprises any one of a transparent layer and a blue color filter.

7. The display device of claim 3 , further comprising an anti-reflection layer provided on the color conversion layer.

8. The display device of claim 7 , wherein the anti-reflection layer comprises any one selected from a color filter layer and a polarizing film.

9. The display device of claim 2 , wherein each of the first light emitting element and the second light emitting element comprises:
a first conductive semiconductor layer doped with a first conductivity dopant;
a second conductive semiconductor layer doped with a second conductivity dopant; and
an active layer provided between the first conductive semiconductor layer and the second conductive semiconductor layer.

10. The display device of claim 9 , wherein each of the first light emitting element and the second light emitting element comprises a light emitting diode having a cylindrical column shape or polygonal column shape having a micro or nano scale.

11. The display device of claim 10 , wherein each of the first light emitting element and the second light emitting element is disposed on the substrate, and has a first end portion and a second end portion in a length direction.

12. The display device of claim 11 , further comprising:
a first electrode disposed on the substrate, the first electrode being adjacent to the first end portion of each of the first and second light emitting elements;
a second electrode disposed on the same plane as the first electrode, the second electrode being adjacent to the second end portion of each of the first and second light emitting elements;
a first contact electrode electrically coupling the first electrode and the first end portion of each of the first and second light emitting elements; and
a second contact electrode electrically coupling the second electrode and the second end portion of each of the first and second light emitting elements.

13. The display device of claim 2 , wherein each of the first to third sub-pixels comprises at least one transistor disposed on the substrate to be coupled to a corresponding light emitting element.

14. The display device of claim 1 , further comprising a planarization layer disposed on the color conversion layer to cover the color conversion layer.

15. A display device comprising:
a substrate comprising a display region and a non-display region;
a plurality of pixels provided in the display region, the plurality of pixels comprising first to third sub-pixels each having a light emitting region configured to emit light;
a light emitting element provided in each of the first to third sub-pixels, the light emitting device being configured to emit light; and
a color conversion layer disposed on the light emitting element, the color conversion layer being configured to convert the light into light of a set color,
wherein the light emitting element comprises a first light emitting element configured to emit a first color light and a second light emitting element configured to emit a second color light different from the first color light,
wherein the first and second light emitting elements are mixed and provided in each of the first to third sub-pixels.

16. The display device of claim 15 , wherein the first color light comprises a first blue-based light and the second color light comprises a second blue-based light different from the first blue-based light, and the first blue-based light has a wavelength shorter than that of the second blue-based light.

17. The display device of claim 16 , wherein the first light emitting element and the second light emitting element have different threshold voltages.

18. The display device of claim 16 , wherein the color conversion layer comprises:
a first color conversion pattern provided in the first sub-pixel, the first color conversion pattern being configured to convert the first and second color light into red light:
a second color conversion pattern provided in the second sub-pixel, the second color conversion pattern being configured to convert the first and second color light into green light; and
a light blocking pattern provided between the first color conversion pattern and the second color conversion pattern.

19. The display device of claim 18 , wherein the first color conversion pattern comprises a red quantum dot, and the second color conversion pattern comprises a green quantum dot.

20. The display device of claim 15 , wherein, when viewed on a plane, the first and second light emitting elements are alternately disposed along one direction of the substrate in a corresponding sub-pixel.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Dong Uk

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10K50/818

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

• H10K59/80518

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

• H10H20/819

  characterised by their shape, e.g. curved or truncated substrates · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title