Light emitting base plate and fabricating method thereof, and displaying device

Patent metadata

Field	Value
Publication number	US-12317650-B2
Application number	US-202117308285-A
Country	US
Kind code	B2
Filing date	May 5, 2021
Priority date	Oct 20, 2020
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

A light emitting base plate and a fabricating method thereof, and a displaying device. In the present disclosure, a light shielding layer is provided on a substrate, a driving functional layer is provided on the light shielding layer, and a light-emitting-device layer and a light absorbing layer are provided on the driving functional layer; the light-emitting-device layer includes a plurality of light emitting devices, and the light absorbing layer includes light absorbing structures each of which surrounds sides of one of the light emitting devices; and the light absorbing structures are configured for blocking light rays exiting from the sides of the light emitting devices.

First claim

The invention claimed is:

1. A light emitting base plate, comprising:
a substrate;
a light shielding layer, provided on the substrate;
a driving functional layer, provided on the light shielding layer;
a light-emitting-device layer, provided on the driving functional layer, wherein the light-emitting-device layer comprises a plurality of light emitting devices; and
a light absorbing layer, provided on the driving functional layer, wherein the light absorbing layer comprises light absorbing structures each of which surrounds sides of one of the plurality of light emitting devices, wherein the sides of the one of the plurality of light emitting devices refer to surfaces of the one of the plurality of light emitting devices that are in a first direction perpendicular to a top surface of the substrate, wherein a material of the light absorbing structures is an organic material, and the organic material allows light rays to transmit with a transmittance less than a preset value;
wherein the light absorbing structures are configured for blocking light rays exiting from sides of the plurality of light emitting devices;
wherein the driving functional layer comprises a first passivation layer, a first electrically conductive layer, a second passivation layer, a second electrically conductive layer and a third electrically conductive layer that are provided sequentially on the light shielding layer; and
the second electrically conductive layer is connected to the first electrically conductive layer via a first via hole penetrating the second passivation layer, and the third electrically conductive layer comprises a first electrically conductive structure and a second electrically conductive structure;
wherein the first electrically conductive layer comprises a plurality of first electrically conductive lead wires that are distributed in a second direction, the second electrically conductive layer comprises a plurality of second electrically conductive lead wires that are distributed in a third direction, the first second direction and the third direction are parallel to the top surface of the substrate and have a preset included angle, and the preset included angle is not 0.

2. The light emitting base plate according to claim 1 , wherein each of the plurality of light emitting devices comprises an anode lead and a cathode lead; and
the anode lead is connected to the first electrically conductive structure, and the cathode lead is connected to the second electrically conductive structure.

3. The light emitting base plate according to claim 2 , wherein the driving functional layer further comprises a third passivation layer provided on a side of the third electrically conductive layer that is further away from the substrate; and
the third passivation layer is provided with a second via hole exposing the first electrically conductive structure, and a third via hole exposing the second electrically conductive structure.

4. The light emitting base plate according to claim 3 , wherein the anode lead is connected to the first electrically conductive structure via the second via hole penetrating the third passivation layer, and the cathode lead is connected to the second electrically conductive structure via the third via hole penetrating the third passivation layer.

5. The light emitting base plate according to claim 1 , wherein all of an orthographic projection of the first electrically conductive layer on the substrate, an orthographic projection of the second electrically conductive layer on the substrate and an orthographic projection of each of the plurality of light emitting devices on the substrate are located within an orthographic projection of the light shielding layer on the substrate.

6. A method for fabricating a light emitting base plate, comprising:
forming a light shielding layer on a substrate;
forming a driving functional layer on the light shielding layer; and
forming a light-emitting-device layer and a light absorbing layer on the driving functional layer;
wherein the light-emitting-device layer comprises a plurality of light emitting devices, and the light absorbing layer comprises light absorbing structures each of which surrounds sides of one of the plurality of light emitting devices, wherein the sides of the one of the plurality of light emitting devices refer to surfaces of the one of the plurality of light emitting devices that are in a first direction perpendicular to a top surface of the substrate, wherein a material of the light absorbing structures is an organic material, and the organic material allows light rays to transmit with a transmittance less than a preset value; and
the light absorbing structures are configured for blocking light rays exiting from sides of the plurality of light emitting devices;
wherein the step of forming the driving functional layer on the light shielding layer comprises:
forming sequentially a first passivation layer, a first electrically conductive layer, a second passivation layer, a second electrically conductive layer and a third electrically conductive layer on the light shielding layer;
wherein the second electrically conductive layer is connected to the first electrically conductive layer via a first via hole penetrating the second passivation layer, and the third electrically conductive layer comprises a first electrically conductive structure and a second electrically conductive structure;
wherein the first electrically conductive layer comprises a plurality of first electrically conductive lead wires that are distributed in a second direction, the second electrically conductive layer comprises a plurality of second electrically conductive lead wires that are distributed in a third direction, the second direction and the third direction are parallel to the top surface of the substrate and have a preset included angle, and the preset included angle is not 0.

7. The method according to claim 6 , wherein the step of forming the driving functional layer on the light shielding layer further comprises:
forming a flat layer on the light shielding layer before the step of forming sequentially the first passivation layer, the first electrically conductive layer, the second passivation layer, the second electrically conductive layer and the third electrically conductive layer on the light shielding layer;
wherein the flat layer covers the light shielding layer and the substrate.

8. A displaying device, comprising:
a display panel and a light emitting base plate, wherein the light emitting base comprises:
a substrate;
a light shielding layer, provided on the substrate;
a driving functional layer, provided on the light shielding layer;
a light-emitting-device layer, provided on the driving functional layer, wherein the light-emitting-device layer comprises a plurality of light emitting devices; and
a light absorbing layer, provided on the driving functional layer, wherein the light absorbing layer comprises light absorbing structures each of which surrounds sides of one of the plurality of light emitting devices, wherein the sides of the one of the plurality of light emitting devices refer to surfaces of the one of the plurality of light emitting devices that are in a first direction perpendicular to a top surface of the substrate, wherein a material of the light absorbing structures is an organic material, and the organic material allows light rays to transmit with a transmittance less than a preset value;
wherein the light absorbing structures are configured for blocking light rays exiting from sides of the plurality of light emitting devices;
wherein the driving functional layer comprises a first passivation layer, a first electrically conductive layer, a second passivation layer, a sec

Assignees

• Boe Technology Group Co Ltd

Inventors

• Li Shipei
• Zhao Ying
• He Wei
• Liang Zhiwei

Classifications

• H10H20/0364

  of interconnections · CPC title

• H10H20/034

  of coatings · CPC title

• H10H29/142

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10H20/8312

  extending at least partially through the bodies · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title