Display substrate including blue light-emitting unit with its light-emitting layer disposed at anti-node, display panel, and display apparatus

Patent metadata

Field	Value
Publication number	US-11575110-B2
Application number	US-202017041339-A
Country	US
Kind code	B2
Filing date	Feb 4, 2020
Priority date	Feb 22, 2019
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

A display substrate includes a base and blue light-emitting units disposed on the base. A blue light-emitting unit includes a first electrode, a first light-emitting layer and a second electrode that are sequentially disposed on the base. Of the first electrode and the second electrode, one electrode is configured to reflect light, and another electrode is configured to transmit light. The first light-emitting layer is configured to emit light having a spectrum whose full width at half maximum is less than or equal to 16 nm.

First claim

What is claimed is:

1. A display substrate, comprising:
a base, and
blue light-emitting units disposed on the base, wherein
a blue light-emitting unit includes a first electrode, a transmission electrode, a first light-emitting layer and a second electrode that are sequentially disposed on the base;
the first electrode is configured to reflect light, and the second electrode is configured to transmit light;
the first light-emitting layer is configured to emit light having a spectrum whose full width at half maximum is less than or equal to 16 nm; and the first light-emitting layer is disposed at a position where a second anti-node is located between a surface of the first electrode proximate to the first light-emitting layer and a surface of the second electrode proximate to the first light-emitting layer; and
a distance between the second anti-node and a surface of the transmission electrode away from the base is 1000 Å.

2. The display substrate according to claim 1 , wherein a thickness of the first light-emitting layer is 200 Å to 300 Å.

3. The display substrate according to claim 1 , wherein in a direction perpendicular to the display substrate, a distance between the surface of the first electrode proximate to the first light-emitting layer and the surface of the second electrode proximate to the first light-emitting layer is 1700 Å.

4. The display substrate according to claim 3 , wherein a thickness of the second electrode is greater than or equal to 200 Å and is less than or equal to 500 Å.

5. The display substrate according to claim 4 , wherein the second electrode includes a magnesium-silver alloy or a calcium-silver alloy.

6. The display substrate according to claim 1 , further comprising a polarizing layer disposed on a side of the blue light-emitting unit away from the base.

7. The display substrate according to claim 6 , wherein a thickness of the second electrode is greater than or equal to 300 Å and is less than or equal to 350 Å.

8. The display substrate according to claim 1 , wherein a distance between a surface of the first light-emitting layer proximate to the base and the surface of the first electrode proximate to the first light-emitting layer is greater than or equal to 250 Å and is less than or equal to 1200 Å.

9. The display substrate according to claim 1 , wherein a thickness of the first electrode is greater than or equal to 1000 Å and is less than or equal to 1500 Å.

10. The display substrate according to claim 1 , wherein the first electrode includes at least one of silver, aluminum, copper, molybdenum, chromium, and titanium.

11. The display substrate according to claim 1 , wherein the blue light-emitting unit further includes a hole injection layer and/or a hole transport layer that are disposed between the first electrode and the first light-emitting layer.

12. The display substrate according to claim 1 , wherein the blue light-emitting unit further includes:
an electron transport layer and/or an electron injection layer that are disposed between the first light-emitting layer and the second electrode.

13. The display substrate according to claim 1 , further comprising red light-emitting units and green light-emitting units, wherein
a red light-emitting unit includes a third electrode, a second light-emitting layer, and a fourth electrode that are sequentially disposed on the base;
a green light-emitting unit includes a fifth electrode, a third light-emitting layer, and a sixth electrode that are sequentially disposed on the base.

14. The display substrate according to claim 13 , wherein
the first electrode, the third electrode, and the fifth electrode are an integrated structure; or, the second electrode, the fourth electrode, and the sixth electrode are an integrated structure.

15. A display panel, comprising the display substrate according to claim 1 .

16. The display panel according to claim 15 , further comprising an encapsulating cover plate disposed opposite to the base; or, a thin film encapsulating layer disposed opposite to the base.

17. A display apparatus, comprising the display panel according to claim 15 .

18. A display substrate, comprising:
a base, and
blue light-emitting units disposed on the base, wherein
a blue light-emitting unit includes a first electrode, a transmission electrode, a first light-emitting layer and a second electrode that are sequentially disposed on the base;
the first electrode is configured to reflect light, and the second electrode is configured to transmit light;
the first light-emitting layer is configured to emit light having a spectrum whose full width at half maximum is less than or equal to 16 nm; and the first light-emitting layer is disposed at a position where a second anti-node is located between a surface of the first electrode proximate to the first light-emitting layer and a surface of the second electrode proximate to the first light-emitting layer; and
a distance between the second anti-node and a surface of the transmission electrode away from the base is 1050 Å.

19. A display panel, comprising the display substrate according to claim 18 .

20. A display apparatus, comprising the display panel according to claim 19 .

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Linlin
• Yan Guang

Classifications

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• H10K59/80518

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

• H10K50/852

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title