Display substrate and display device

Patent metadata

Field	Value
Publication number	US-12133428-B2
Application number	US-202117753513-A
Country	US
Kind code	B2
Filing date	Mar 25, 2021
Priority date	Mar 25, 2021
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

A display substrate and a display device are provided. The display substrate includes a base substrate and a light-shielding layer. The base substrate includes a display region including repeating units, each repeating unit includes a transparent region and a pixel region, the pixel region includes sub-pixels, each sub-pixel includes a sub-pixel driving circuit and a light-emitting element, and the light-emitting element includes a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode. The light-shielding layer is located on a side of the sub-pixel driving circuit close to the base substrate, at least part of an orthographic projection of the light-shielding layer on a main surface of the base substrate overlaps with an orthographic projection of the sub-pixel driving circuit on the main surface of the base substrate, and the light-shielding layer is connected with the second electrode.

First claim

What is claimed is:

1. A display substrate, comprising:
a base substrate, comprising a display region, wherein the display region comprises a plurality of repeating units arranged in array, each of the plurality of repeating units comprises a transparent region and a pixel region which are arranged in a first direction, the pixel region comprises a plurality of sub-pixels, each of the plurality of sub-pixels comprises a sub-pixel driving circuit and a light-emitting element, the light-emitting element is located on a side of the sub-pixel driving circuit away from the base substrate, the sub-pixel driving circuit is configured to drive the light-emitting element to emit light, and the light-emitting element comprises a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; and
a light-shielding layer, provided on the base substrate and located on a side of the sub-pixel driving circuit close to the base substrate, wherein at least part of an orthographic projection of the light-shielding layer on a main surface of the base substrate overlaps with an orthographic projection of the sub-pixel driving circuit on the main surface of the base substrate, and the light-shielding layer is connected with the second electrode so as to be multiplexed as an auxiliary electrode of the second electrode wherein: the pixel region comprises an electrode overlapping region, the electrode overlapping region is located on a side of the pixel region close to the transparent region, and an orthographic projection of the electrode overlap region on the main surface of the base substrate at least partially overlaps with the orthographic projection of the light-shielding layer on the main surface of the base substrate; and the electrode overlapping region comprises a first composite hole structure and a first composite connection electrode, and the light-shielding layer is connected with the second electrode through the first composite connection electrode and the first composite hole structure.

2. The display substrate according to claim 1 , wherein
the first composite connection electrode comprises a first connection electrode and a second connection electrode, and the first composite hole structure comprises a first hole and a second hole; and
the first connection electrode is connected with the light-shielding layer through the first hole, the second connection electrode is connected with the first connection electrode through the second hole, and the second connection electrode is further connected with the second electrode.

3. The display substrate according to claim 2 , further comprising a first insulating layer, a second insulating layer, a first conductive layer, a third insulating layer, and a first electrode layer, wherein
the first insulating layer is located on a side of the light-shielding layer away from the base substrate, the second insulating layer is located on a side of the first insulating layer away from the base substrate, the first conductive layer is located on a side of the second insulating layer away from the base substrate, the third insulating layer is located on a side of the first conductive layer away from the base substrate, and the first electrode layer is located on a side of the third insulating layer away from the base substrate;
the first hole comprises a first sub-hole penetrating through the first insulating layer and a second sub-hole penetrating through the second insulating layer, the second sub-hole is nested in the first sub-hole, the first sub-hole and the second sub-hole are provided to expose the light-shielding layer, and the second hole penetrates through the third insulating layer to expose the first connection electrode;
the first conductive layer comprises the first connection electrode;
the first electrode layer comprises the second connection electrode and the first electrode of the light-emitting element; and
the first electrode of the light-emitting element and the second connection electrode are provided in the same layer and with the same material, and the first electrode of the light-emitting element and the second connection electrode are spaced apart from each other.

4. The display substrate according to claim 3 , further comprising a buffer layer, wherein
the buffer layer is located between the first insulating layer and the second insulating layer, the first hole further comprises a third sub-hole, and the third sub-hole is nested between the first sub-hole and the second sub-hole; and
the third sub-hole penetrates through the buffer layer and is provided to expose the light-shielding layer.

5. The display substrate according to claim 3 , further comprising a passivation layer, wherein
the passivation layer is located between the third insulating layer and the first conductive layer; and
the second hole further penetrates through the passivation layer.

6. The display substrate according to claim 3 , wherein
the second connection electrode comprises a first sub-electrode layer, a second sub-electrode layer, and a third sub-electrode layer which are sequentially stacked, the first sub-electrode layer is located on a side of the third sub-electrode layer close to the base substrate, and the second sub-electrode layer is located between the first sub-electrode layer and the third sub-electrode layer;
an orthographic projection of the second sub-electrode layer on the main surface of the base substrate is within an orthographic projection of the first sub-electrode layer on the main surface of the base substrate; and
an orthographic projection of the third sub-electrode layer on the main surface of the base substrate is within the orthographic projection of the first sub-electrode layer on the main surface of the base substrate, and an area of the orthographic projection of the first sub-electrode layer on the main surface of the base substrate is larger than an area of the orthographic projection of the third sub-electrode layer on the main surface of the base substrate.

7. The display substrate according to claim 6 , wherein
an area of the orthographic projection of the second sub-electrode layer on the main surface of the base substrate is smaller than the area of the orthographic projection of the first sub-electrode layer on the main surface of the base substrate and the area of the orthographic projection of the third sub-electrode layer on the main surface of the base substrate, respectively; and
cross-sections of the first sub-electrode layer, the second sub-electrode layer, and the third sub-electrode layer constitute an I-shaped, and the first sub-electrode layer is connected with the first connection electrode through the second hole.

8. The display substrate according to claim 6 , further comprising a pixel defining layer, wherein
the pixel defining layer is located on a side of the first electrode away from the base substrate; and
in the electrode overlapping region, at least part of the pixel defining layer covers a portion of the first sub-electrode layer protruding from the second sub-electrode layer.

9. The display substrate according to claim 8 , wherein
the light-emitting layer of the light-emitting element is provided on a side of the pixel defining layer away from the base substrate; and
the light-emitting layer comprises a first portion and a second portion which are located in the electrode overlapping region, the first portion covers at least part of the portion of the first sub-electrode layer protruding from the second sub-electrode layer, and the second portion is located on a side of the third sub-electrode layer away from the base substrate.

10. The display substrat

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zhang Xing
• Gao Zhan
• Lin Yicheng
• Xu Pan
• Han Ying
• Wang Guoying
• Zhang Dacheng

Classifications

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10D30/6723

  having light shields · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title