Abstract: This application provides an array base plane, a method for preparing an array base plane, a display panel, and a terminal device, and relates to the field of display technologies. The array base plane has a plurality of sub-pixel regions. The array base plane includes a substrate and a first pixel definition layer disposed on the substrate. The first pixel definition layer is disposed between adjacent sub-pixel regions, and the first pixel definition layer includes a plurality of first protrusions in a direction from any one of the sub-pixel regions to a sub-pixel region adjacent to the any one sub-pixel region.