Patent ID: 11968871
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC H

Claim 8:
9. A method for manufacturing a display substrate having a plurality of subpixel regions comprising:
forming a pixel definition layer on a base substrate, the pixel definition layer defining a plurality of subpixel openings, and each of the plurality of subpixel openings occupying one of the plurality of the subpixel regions;
forming a functional medium layer in each subpixel region and on a side of the pixel definition layer away from the base substrate, wherein
the functional medium layer comprises: a first portion covering side surfaces of each of the plurality of subpixel openings and a second portion covering a top surface of the pixel definition layer, and
in a same subpixel region, surface energy of the first portion is larger than surface energy of the second portion,
wherein forming the functional medium layer in each subpixel region and on a side of the pixel definition layer away from the base substrate comprises:
forming a lyophobic polymer layer covering a bottom of each of the plurality of subpixel openings, the side surfaces of each of the plurality of subpixel openings, and the top surface of the pixel definition layer to obtain a body material layer;
forming a lyophilic monomer material layer on a side of the body material layer away from the base substrate;
exposing the body material layer and the lyophilic monomer material layer such that:
in any one subpixel region, portions of the body material layer and the lyophilic monomer material layer at the bottom of each of the plurality of subpixel openings are not exposed, and an exposure amount of portions of the body material layer and the lyophilic monomer material layer at the side surfaces of each of the plurality of subpixel openings is greater than an exposure amount of portions of the body material layer and the lyophilic monomer material layer at the top surface of the pixel definition layer, and
a lyophilic monomer material in the lyophilic monomer material layer is photo-grafted with lyophobic polymer in an upper portion of the body material layer to form the first portion and the second portion of the functional medium layer, and a grafting ratio of the first portion is greater than a grafting ratio of the second portion; and
removing the lyophilic monomer material layer at the bottom of each of the plurality of subpixel openings.