US 12,342,711 B2
Display substrate and mask plate assembly
Yongjie Song, Beijing (CN); Fengli Ji, Beijing (CN); Chang Luo, Beijing (CN); Jianpeng Wu, Beijing (CN); Yi Ma, Beijing (CN); Xiaoyu Yang, Beijing (CN); and Sen Du, Beijing (CN)
Assigned to Chengdu BOE Optoelectronics Technology Co., Ltd., Sichuan (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/295,602
Filed by CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD., Sichuan (CN); and BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
PCT Filed Aug. 18, 2020, PCT No. PCT/CN2020/109811
§ 371(c)(1), (2) Date May 20, 2021,
PCT Pub. No. WO2021/032087, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 201910763581.7 (CN), filed on Aug. 19, 2019.
Prior Publication US 2022/0020829 A1, Jan. 20, 2022
Int. Cl. H01L 27/32 (2006.01); H10K 50/80 (2023.01); H10K 59/122 (2023.01); H10K 71/00 (2023.01); H10K 71/16 (2023.01); H10K 101/00 (2023.01)
CPC H10K 71/166 (2023.02) [H10K 50/80 (2023.02); H10K 59/122 (2023.02); H10K 71/00 (2023.02); H10K 2101/00 (2023.02)] 8 Claims
OG exemplary drawing
 
1. A display substrate, comprising:
a base substrate; and
a pixel defining layer, a functional layer, a cathode layer and a covering layer which are sequentially stacked in a direction away from the base substrate,
wherein a size of the orthographic projection of the functional layer on the base substrate is determined by a size of a display area and a first minimum distance, the first minimum distance is a minimum distance between a boundary of the display area and a boundary of the functional layer in a direction from the display area to a non-display area and is determined by a first shadow width of the functional layer extending from the display area to the non-display area, and the first shadow width is a maximum value of a width of a shadow area of the functional layer in a preset area,
wherein the first minimum distance is determined by a formula d=√a2+b2+c, a is an alignment accuracy, b is a position accuracy of a mask plate, c is the first shadow width, and d is the first minimum distance, thereby preventing pixels at an edge of the display area from being affected by the shadow area on the functional layer,
wherein a size of an orthogonal projection of the pixel defining layer on the base substrate is determined by the size of the display area, the first minimum distance and a second minimum distance, the second minimum distance is a minimum distance between the boundary of the functional layer and a boundary of the pixel defining layer in a direction from the display area to the non-display area and is determined by a second shadow width of the functional layer, the pixel defining layer extends from the display area to the non-display area, and the second shadow width is a maximum value of a width of a shadow area of the functional layer outside the preset area, and
wherein the second minimum distance is determined by a formula f=√a2+b2+e, a is an alignment accuracy, b is a position accuracy of a mask plate, e is the second shadow width, and f is the second minimum distance, thereby avoiding a non-uniform display brightness caused by the boundary of the functional layer exceeding the boundary of the pixel defining layer.