US 12,219,795 B2
Display substrate, preparation method thereof, and display device
Qing Wang, Beijing (CN); Kuanta Huang, Beijing (CN); Xiaochuan Chen, Beijing (CN); and Dacheng Zhang, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/258,433
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Mar. 27, 2020, PCT No. PCT/CN2020/081838
§ 371(c)(1), (2) Date Jan. 6, 2021,
PCT Pub. No. WO2021/189474, PCT Pub. Date Sep. 30, 2021.
Prior Publication US 2022/0140282 A1, May 5, 2022
Int. Cl. H10K 50/844 (2023.01); H10K 59/38 (2023.01); H10K 71/00 (2023.01)
CPC H10K 50/844 (2023.02) [H10K 59/38 (2023.02); H10K 71/00 (2023.02)] 20 Claims
OG exemplary drawing
 
1. A display substrate, comprising:
a base substrate, a light-emitting element disposed on the base substrate, and an encapsulation layer disposed on the light-emitting element, wherein:
the display substrate further comprises a driving circuit connected with the light-emitting element and configured to drive the light-emitting element, the driving circuit comprises a driving transistor which comprises an active layer located inside the base substrate;
the encapsulation layer comprises a first gradient layer and a second gradient layer stacked along a direction away from the base substrate;
in a direction perpendicular to the base substrate and from a layer where the base substrate is located to a layer where an uppermost layer of the display substrate is located, a content of oxygen element in the first gradient layer of the encapsulation layer gradually decreases;
in the direction perpendicular to the base substrate and from the layer where the base substrate is located to the layer where the uppermost layer of the display substrate is located, a content of carbon element in the second gradient layer of the encapsulation layer gradually increases; and
the encapsulation layer comprising the first gradient layer and the second gradient layer is formed with a structure of material functional gradient change.