US 12,356,822 B2
Oled display panel having multiple light-emitting layers and a pixel definition layer provided with openings, and preparation method therefor, and display apparatus
Haidong Wu, Beijing (CN); Xiaobo Du, Beijing (CN); Xiaojin Zhang, Beijing (CN); and Guanyin Wen, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/771,824
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Jul. 7, 2021, PCT No. PCT/CN2021/104911
§ 371(c)(1), (2) Date Apr. 26, 2022,
PCT Pub. No. WO2022/042059, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 202010874949.X (CN), filed on Aug. 27, 2020.
Prior Publication US 2022/0376001 A1, Nov. 24, 2022
Int. Cl. H10K 59/35 (2023.01); H10K 50/18 (2023.01); H10K 59/12 (2023.01); H10K 71/00 (2023.01)
CPC H10K 59/35 (2023.02) [H10K 59/12 (2023.02); H10K 71/00 (2023.02); H10K 50/181 (2023.02); H10K 59/1201 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An OLED display panel, comprising a display region, wherein the display region comprises a first sub-pixel, a second sub-pixel, and a third sub-pixel displaying different colors respectively;
the display region comprises a driving structure layer, a first electrode layer, a pixel definition layer, an organic function layer and a second electrode layer sequentially stacked on a base substrate, wherein the first electrode layer includes multiple first electrodes, and the first electrodes are connected with a pixel drive circuit in the driving structure layer, the pixel definition layer is provided with a first opening, a second opening and a third opening for defining the first sub-pixel, the second sub-pixel and the third sub-pixel respectively, wherein each of the openings exposes a surface of a first electrode of a sub-pixel defined by the opening facing away from the base substrate;
the organic function layer comprises a first light-emitting layer located in the first sub-pixel, a second light-emitting layer located in the second sub-pixel, and a third light-emitting layer covering the display region and having an integrated structure;
an orthographic projection of the first light-emitting layer on the base substrate contains an orthographic projection of the first opening on the base substrate and does not overlap with an orthographic projection of the second opening and the third opening on the base substrate; an orthographic projection of the second light-emitting layer on the base substrate contains an orthographic projection of the second opening on the base substrate and does not overlap with an orthographic projection of the first opening and the third opening on the base substrate; and
the third light-emitting layer is disposed on surfaces of the first light-emitting layer and the second light-emitting layer facing away from the base substrate,
wherein a buffer layer is disposed only in the first sub-pixel, a material of the buffer layer is a material whose hole mobility is higher than electron mobility, and a microcavity length of a microcavity structure of the first sub-pixel is adjusted by adjusting a thickness of the buffer layer and a thickness of the first light-emitting layer, thus obtaining optical and electrical characteristics required by the first sub-pixel.