Display substrate, manufacturing method thereof, and display device

Patent metadata

Field	Value
Publication number	US-11937481-B2
Application number	US-202015734826-A
Country	US
Kind code	B2
Filing date	Apr 9, 2020
Priority date	Apr 9, 2019
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A display substrate, a manufacturing method thereof, and a display device are provided. The display substrate includes a base substrate and a white OLED display unit on the base substrate, and further includes: an optical adjustment structure on a light emitting side of the white OLED display unit, where the optical adjustment structure is in a peripheral region of each pixel region. The optical adjustment structure is configured to absorb light in a first wavelength range or convert light in a first wavelength range into light in a second wavelength range.

First claim

What is claimed is:

1. A display substrate, comprising:
a base substrate;
a white organic light-emitting diode (OLED) display unit on the base substrate; and
an optical adjustment structure on a light emitting side of the white OLED display unit, wherein the optical adjustment structure is in a peripheral region of each pixel region, and the optical adjustment structure is configured to absorb light in a first wavelength range or convert light in a first wavelength range into light in a second wavelength range;
wherein an angle, between a line connecting a first peripheral point of the optical adjustment structure and a center of the white OLED display unit and a normal line perpendicular to the base substrate, is greater than a threshold, the threshold ranges from 45 degrees to 60 degrees, the first peripheral point is the point closest to the center of the white OLED display unit on the optical adjustment structure;
in a direction where the center of the white OLED display unit faces the optical adjustment structure, an intensity decrease rate of the light in the first wavelength range is smaller than that of the light in the second wavelength range.

2. The display substrate according to claim 1 , wherein the pixel region further comprises a central region, the peripheral region surrounds the central region, and the optical adjustment structure is symmetrical with respect to the central region.

3. The display substrate according to claim 2 , further comprising: an auxiliary structure in a same layer as the optical adjustment structure, wherein the auxiliary structure and the optical adjustment structure form a flat layer.

4. The display substrate according to claim 2 , further comprising: an auxiliary structure covering the optical adjustment structure, wherein the auxiliary structure has a flat surface.

5. The display substrate according to claim 1 , further comprising: an auxiliary structure in a same layer as the optical adjustment structure, wherein the auxiliary structure and the optical adjustment structure form a flat layer.

6. The display substrate according to claim 5 , wherein the auxiliary structure is made of a light-transmissive material.

7. The display substrate according to claim 1 , further comprising: an auxiliary structure covering the optical adjustment structure, wherein the auxiliary structure has a flat surface.

8. The display substrate according to claim 1 , wherein the optical adjustment structure is configured to absorb green light, or, convert green light into red light or blue light.

9. The display substrate according to claim 8 , wherein the optical adjustment structure comprises a red filter layer and a blue filter layer that are stacked.

10. The display substrate according to claim 1 , wherein the optical adjustment structure comprises at least one of: a photonic crystal, a color conversion structure, or a filter structure.

11. A display device, comprising the display substrate according to claim 1 .

12. A method for manufacturing a display substrate, comprising: forming an optical adjustment structure on a light emitting side of a white OLED display unit, wherein the optical adjustment structure is in a peripheral region of each pixel region, and the optical adjustment structure is configured to absorb light in a first wavelength range or convert light in a first wavelength range into light in a second wavelength range;
wherein an angle, between a line connecting a first peripheral point of the optical adjustment structure and a center of the white OLED display unit and a normal line perpendicular to the base substrate, is greater than a threshold, the threshold ranges from 45 degrees to 60 degrees, the first peripheral point is the point closest to the center of the white OLED display unit on the optical adjustment structure;
in a direction where the center of the white OLED display unit faces the optical adjustment structure, an intensity decrease rate of the light in the first wavelength range is smaller than that of the light in the second wavelength range.

13. The method for manufacturing the display substrate according to claim 12 , wherein the optical adjustment structure is symmetrical with respect to a central region of the pixel region, and the peripheral region of the pixel region surrounds the central region.

14. The method for manufacturing the display substrate according to claim 12 , further comprising: forming an auxiliary structure in a same layer as the optical adjustment structure, wherein the auxiliary structure and the optical adjustment structure form a flat layer.

15. The method for manufacturing the display substrate according to claim 14 , wherein the forming the auxiliary structure comprises forming the auxiliary structure with a light-transmissive material.

16. The method for manufacturing the display substrate according to claim 12 , further comprising: forming an auxiliary structure covering the optical adjustment structure, wherein the auxiliary structure has a flat surface.

17. The method for manufacturing the display substrate according to claim 12 , wherein the forming the optical adjustment structure comprises: forming a red filter layer and a blue filter layer that are stacked.

18. The method for manufacturing the display substrate according to claim 12 , wherein before the forming the optical adjustment structure, the method further comprises: providing a base substrate, wherein the white OLED display unit is arranged on the base substrate.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yan Guang
• Wu Changyen
• Wang Linlin
• Shen Yongqi
• You Juanjuan
• Sun Li

Classifications

• H10K59/875

  Arrangements for extracting light from the devices · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/38 Primary

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

• H10K50/865

  comprising light absorbing layers, e.g. light-blocking layers · CPC title

• H10K59/121

  characterised by the geometry or disposition of pixel elements · CPC title