US 12,721,000 B2Granted

Display substrate and preparation method therefor

AssigneesBeijing BOE Technology Development Co., Ltd., Boe Technology Group Co., Ltd.

InventorsDacheng Zhang, Pan Li

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Abstract

A display substrate and a manufacturing method thereof are provided. The display substrate includes a base substrate, a first metal layer, a first insulating layer, a first electrode layer, a light-emitting material layer, a carbon-containing structural layer and a second electrode layer. The first metal layer includes an auxiliary electrode pattern; the first electrode layer and the light-emitting material layer include a via hole; the second electrode layer is electrically connected to the auxiliary electrode pattern through the carbon-containing structural layer. A distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is respectively denoted by d1 and d2, and an average carbon-oxygen ratio of the carbon-containing structural layer is respectively denoted by c1 and c2, near a middle portion and near an edge of the via hole; and d1<d2 and c1>c2.

Claims19

Dependent claims

A display substrate, comprising:

a base substrate;
a first metal layer, disposed on the base substrate and comprising at least one auxiliary electrode pattern;
a first insulating layer, disposed on a side, away from the base substrate, of the first metal layer and comprising at least one first via hole exposing a portion of the at least one auxiliary electrode pattern;
a first electrode layer, disposed on a side, away from the base substrate, of the first insulating layer;
a light-emitting material layer, disposed on a side, away from the base substrate, of the first electrode layer, wherein the first electrode layer and the light-emitting material layer comprise at least one second via hole which exposes a portion of the at least one auxiliary electrode pattern and is communicated with the at least one first via hole;
a carbon-containing structural layer, at least partially disposed in the at least one second via hole;
and
a second electrode layer, disposed on a side, from the base substrate, of the light-emitting material layer and the carbon-containing structural layer, wherein the second electrode layer is electrically connected to the at least one auxiliary electrode pattern through the carbon-containing structural layer;
near a middle portion of the second via hole, a distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is denoted by d1, and an average carbon-oxygen ratio of the carbon-containing structural layer is denoted by c1;
near an edge of the second via hole, a distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is denoted by d2, and an average carbon-oxygen ratio of the carbon-containing structural layer is denoted by c2;
and d1<d2 and c1>c2 wherein;
c1*d1>c2*d2.

9 more elements

A display substrate, comprising:

a base substrate;
a first metal layer, disposed on the base substrate and comprising at least one auxiliary electrode pattern;
a first insulating layer, disposed on a side, away from the base substrate, of the first metal layer and comprising at least one first via hole exposing a portion of the at least one auxiliary electrode pattern:
a first electrode layer, disposed on a side, away from the base substrate, of the first insulating layer;
a light-emitting material layer, disposed on a side, away from the base substrate, of the first electrode layer, wherein the first electrode layer and the light-emitting material layer comprise at least one second via hole which exposes a portion of the at least one auxiliary electrode pattern and is communicated with the at least one first via hole;
a carbon-containing structural layer, at least partially disposed in the at least one second via hole;
and
a second electrode layer, disposed on a side, from the base substrate, of the light-emitting material layer and the carbon-containing structural layer, wherein the second electrode layer is electrically connected to the at least one auxiliary electrode pattern through the carbon-containing structural layer:
near a middle portion of the second via hole, a distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is denoted by d1, and an average carbon-oxygen ratio of the carbon-containing structural layer is denoted by c1;
near an edge of the second via hole, a distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is denoted by d2, and an average carbon-oxygen ratio of the carbon-containing structural layer is denoted by c2;
and d1<d2 and
wherein an orthographic projection of the first via hole on the base substrate is located within an orthographic projection of the auxiliary electrode pattern on the base substrate, and an orthographic projection of the second via hole on the base substrate is located within the orthographic projection of the first via hole on the base substrate.

9 more elements

A display substrate, comprising:

a base substrate;
a first metal layer, disposed on the base substrate and comprising at least one auxiliary electrode pattern;
a first insulating layer, disposed on a side, away from the base substrate, of the first metal layer and comprising at least one first via hole exposing a portion of the at least one auxiliary electrode pattern;
a first electrode layer, disposed on a side, away from the base substrate, of the first insulating layer;
a light-emitting material layer, disposed on a side, away from the base substrate, of the first electrode layer, wherein the first electrode layer and the light-emitting material layer comprise at least one second via hole which exposes a portion of the at least one auxiliary electrode pattern and is communicated with the at least one first via hole;
a carbon-containing structural layer, at least partially disposed in the at least one second via hole;
and
a second electrode layer, disposed on a side, from the base substrate, of the light-emitting material layer and the carbon-containing structural layer, wherein the second electrode layer is electrically connected to the at least one auxiliary electrode pattern through the carbon-containing structural layer;
near a middle portion of the second via hole, a distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is denoted by d1, and an average carbon-oxygen ratio of the carbon-containing structural layer is denoted by c1;
near an edge of the second via hole, a distance between a surface, close to the base substrate, of the first metal layer and a surface, away from the base substrate, of the second electrode layer is denoted by d2, and an average carbon-oxygen ratio of the carbon-containing structural layer is denoted by c2;
and d1<d2 and c1>c2;
wherein
the auxiliary electrode pattern comprises a first slope portion at the edge of the second via hole, and the inter-layer insulating layer comprises a second slope portion at the edge of the second via hole;
and
a length of the first slope portion is less than a length of the second slope portion.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/546,721Filed 4 Jul 2022
Priority: CN 202110776580.39 Jul 2021
Published: US 2024/0172525 A123 May 2024
Granted: 25 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H10K 59/122
Active-matrix OLED [AMOLED] displays: pixel-defining structures or layers, e.g. banks
H10K 59/80522
Cathodes: combined with auxiliary electrodes
H10K 50/824
Cathodes: combined with auxiliary electrodes
H10K 59/1201
Active-matrix OLED [AMOLED] displays: manufacture or treatment