Display substrate and method of manufacturing the same, display panel, and display device

Patent metadata

Field	Value
Publication number	US-11985877-B2
Application number	US-202017419108-A
Country	US
Kind code	B2
Filing date	Sep 23, 2020
Priority date	Sep 24, 2019
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

A display substrate having a display area is provided. The display substrate includes a base and a plurality of light-emitting devices disposed on the base and located in the display area. Each light-emitting device includes a light-emitting portion. In at least one light-emitting device, the light-emitting portion is manufactured using an ink-jet printing process. Distances from a plurality of selected points on an edge of an orthographic projection of the light-emitting portion manufactured using the ink-jet printing process on the base to a center of the orthographic projection are equal. Using the center of the orthographic projection as a center of a circle and a distance from a selected point in the plurality of selected points to the center of the orthographic projection as a radius, the plurality of selected points are distributed on the circle at equal intervals.

First claim

What is claimed is:

1. A display substrate having a display area, the display substrate comprising:
a base; and
a plurality of light-emitting devices disposed on the base and located in the display area, each light-emitting device including a light-emitting portion; wherein
the light-emitting portion in at least one light-emitting device is a light-emitting portion that is manufactured using an ink-jet printing process, and distances from a plurality of selected points on an edge of an orthographic projection of the light-emitting portion manufactured using the ink-jet printing process on the base to a center of the orthographic projection are equal; and
the plurality of selected points are distributed on a circle at equal intervals when using the center of the orthographic projection as a center of the circle and a distance from one of the plurality of selected points to the center of the orthographic projection as a radius;
wherein the plurality of light-emitting devices include a first light-emitting device capable of emitting light of a first color, a second light-emitting device capable of emitting light of a second color, and a third light-emitting device capable of emitting light of a third color; wherein the first, second and third colors are three primary colors;
an area of a light exit surface of the first light-emitting device or the second light-emitting device is less than or equal to an area of a light exit surface of the third light-emitting device;
the first light-emitting device and the second light-emitting device are located within a range defined by an outer contour of the third light-emitting device; and orthographic projections of the first light-emitting device, the second light-emitting device and the third light-emitting device on the base do not overlap; and
an orthographic projection of a light-emitting portion on the base of at least one of the first light-emitting device and the second light-emitting device is in a shape of a circle.

2. The display substrate according to claim 1 , wherein
the light-emitting portion whose orthographic projection is in the shape of the circle is manufactured using the ink-jet printing process.

3. The display substrate according to claim 1 , wherein the first light-emitting device includes a first light-emitting portion, the second light-emitting device includes a second light-emitting portion, and the third light-emitting device includes a third light-emitting portion;
the display substrate includes a third light-emitting layer covering the display area, and a portion of the third light-emitting layer located in a region where the third light-emitting device is located forms the third light-emitting portion;
a portion of the third light-emitting layer located in a region where the first light-emitting device is located is disposed on a side of the first light-emitting portion away from the base; and
a portion of the third light-emitting layer located in a region where the second light-emitting device is located is disposed on a side of the second light-emitting portion away from the base.

4. The display substrate according to claim 3 , wherein a thickness of the third light-emitting layer is less than thicknesses of the first light-emitting portion and the second light-emitting portion.

5. The display substrate according to claim 3 , further comprising at least one first common film layer and at least one second common film layer;
the at least one first common film layer includes at least one of a hole injection layer and a hole transport layer, and the at least one second common film layer includes at least one of an electron injection layer and an electron transport layer;
each first common film layer and each second common film layer cover the display area, and the plurality of light-emitting devices share the at least one first common film layer and the at least one second common film layer;
the at least one first common film layer is located between the third light-emitting layer and the base, and the at least one second common film layer is located on a side of the third light-emitting layer away from the base;
in the first light-emitting device, the first light-emitting portion is located between the third light-emitting layer and the at least one first common film layer; and in the second light-emitting device, the second light-emitting portion is located between the third light-emitting layer and the at least one first common film layer.

6. The display substrate according to claim 1 , further comprising a pixel defining layer including a plurality of first pixel defining patterns, a plurality of second pixel defining patterns and a third pixel defining pattern; wherein
each first pixel defining pattern includes a first opening, and one first light-emitting device is located in one first opening;
each second pixel defining pattern includes a second opening, and one second light-emitting device is located in one second opening; and
the third pixel defining pattern includes a plurality of third openings, and one first pixel defining pattern and one second pixel defining pattern are disposed in one third opening; one third light-emitting device is located in a remaining region in one third opening apart from a region occupied by the first pixel defining pattern and the second pixel defining pattern.

7. The display substrate according to claim 1 , wherein an orthographic projection of an outer contour of the third light-emitting device on the base is in a shape of a rectangle or a rectangle with rounded corners.

8. The display substrate according to claim 2 , wherein in both the first light-emitting device and the second light-emitting device, the orthographic projection of the light-emitting portion on the base is in the shape of the circle or the regular polygon.

9. The display substrate according to claim 2 , wherein the first color is red, the second color is green, and the third color is blue.

10. The display substrate according to claim 9 , wherein the area of the light exit surface of the first light-emitting device is less than the area of the light exit surface of the second light-emitting device, and the area of the light exit surface of the second light-emitting device is less than the area of the light exit surface of the third light-emitting device.

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

12. A display device, comprising the display panel according to claim 11 .

13. A method of manufacturing a display substrate, the display substrate having a display area; the method comprising:
forming a plurality of light-emitting devices in a region corresponding to the display area on a base, each light-emitting device including a light-emitting portion; wherein
in at least one light-emitting device, the light-emitting portion is manufactured using an ink-jet printing process, and distances from a plurality of selected points on an edge of an orthographic projection of the light-emitting portion manufactured using the ink-jet printing process on the base to a center of the orthographic projection are equal; and
using the center of the orthographic projection as a center of a circle and a distance from one of the plurality of selected points to the center of the orthographic projection as a radius, the plurality of selected points are distributed on the circle at equal intervals;
wherein forming the plurality of light-emitting devices, includes:
forming first light-emitting devices capable of emitting light of a first color, second light-emitting devices capable of emitting light of a second color, and third light-emitting devices capable

Assignees

• Boe Technology Group Co Ltd

Inventors

• Hou Wenjun

Classifications

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/352 Primary

  the areas of the RGB subpixels being different · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/173

  comprising banks or shadow masks · CPC title

• H10K71/00

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