Array substrate having an isolation pillar in a hole border area, preparation method thereof and display device

Abstract

The present disclosure provides an array substrate, a preparation method thereof, and a display device. The array substrate has an opening area and a hole border area. A method of preparation of the array substrate includes: forming a source-drain metal layer on a side of the base substrate, wherein the source-drain metal layer is formed with a first isolation pillar surrounding the opening area in the hole border area, and the first isolation pillar includes a first metal layer and a second metal layer located on a side of the first metal layer away from the base substrate; forming a planarization layer covering at least a lateral surface of each first metal layer; forming a pixel electrode layer; forming a protective layer covering the pixel electrode layer, the protective layer exposing the hole border area; removing a part of the planarization layer located in the hole border area; partially etching the first metal layer from the lateral surface to form a third metal layer; removing the protective layer; forming an organic light emitting layer and a common electrode layer in sequence. The preparation method of the array substrate can improve the yield of the array substrate.