US 12,225,779 B2
Display substrate, method for forming the same and display device each having part of pixel definition layer arranged in groove in planarization layer
Linlin Wang, Beijing (CN); and Ying Cui, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/765,397
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Apr. 15, 2021, PCT No. PCT/CN2021/087439
§ 371(c)(1), (2) Date Mar. 30, 2022,
PCT Pub. No. WO2021/238482, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 202010465889.6 (CN), filed on May 28, 2020.
Prior Publication US 2022/0376007 A1, Nov. 24, 2022
Int. Cl. H10K 59/122 (2023.01); H10K 59/12 (2023.01)
CPC H10K 59/122 (2023.02) [H10K 59/1201 (2023.02)] 18 Claims
OG exemplary drawing
 
1. A display substrate comprising a base substrate, a thin film transistor array layer located on the base substrate, a planarization layer covering the thin film transistor array layer, and a first electrode and a pixel definition layer located on the planarization layer, the pixel definition layer defining a plurality of pixel openings, each pixel opening comprising a first edge and a second edge adjacent to each other, the pixel definition layer comprising a first pixel definition layer parallel to the first edge and a second pixel definition layer parallel to the second edge in a display region of the display substrate, wherein a surface of the first pixel definition layer away from the base substrate is located at a level lower than a surface of the second pixel definition layer away from the base substrate, a groove parallel to the first edge is arranged in a surface of the planarization layer away from the base substrate, at least a part of the first pixel definition layer is arranged in the groove, the pixel definition layer further comprises a third pixel definition layer surrounding the display region, and a surface of the third pixel definition layer away from the base substrate is located at a level not lower than the surface of the second pixel definition layer away from the base substrate;
wherein the display substrate comprises a plurality of first electrodes separate from each other, and an orthogonal projection of a gap between adjacent first electrodes onto the base substrate is within an orthogonal projection of a groove bottom of the groove onto the base substrate.