An array substrate, a manufacturing method thereof, and a display device including the array substrate. The array substrate includes a plurality of gate line groups and a plurality of data lines disposed on a substrate, the plurality of gate line groups intersecting with the plurality of data lines to define a plurality of pixel units arranged in an array, wherein each of the plurality of gate line groups includes a first gate line and a second gate line insulated from each other, and orthographic projections of the first gate line and the second gate line of each of the plurality of gate line groups on the substrate at least partially overlap.