An array substrate and a display device are disclosed in the present application, the substrate includes a plurality of pixel units, one pixel unit at least comprises a first sub-pixel unit; a pixel electrode at least comprises a first pixel sub-electrode, the first pixel sub-electrode is arranged in the first sub-pixel unit, and comprises a plurality of branch electrodes; wherein the first sub-pixel unit at least comprises a first electrode sub-region and a second electrode sub-region, widths of the branch electrodes in the first electrode sub-region and the second electrode sub-region are different.