Patent ID: 11903234
Assignee: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. The preparation method of claim 16, wherein forming the first barrier wall comprises:
sequentially forming a third metal material layer, a first metal material layer and a second metal material layer on a first side of a base substrate;
performing a first etching process on the third metal material layer, the first metal material layer and the second metal material layer to form the electrode pattern and an initial barrier wall; and
performing a second etching process on the initial barrier wall to form the first barrier wall, wherein a wet etching method is adopted in the second etching process, and an etching rate produced by an etching solution used in the second etching process on the first metal material layer is larger than an etching rate produced by the etching solution on the second metal material layer and is larger than an etching rate produced by the etching solution on the third metal material layer, so that the recess is formed.