The invention relates to an array substrate, an array substrate manufacturing method, and a display device, and belongs to the technical field of display. The method comprises a substrate, and the substrate is sequentially provided with a pattern, comprising grid electrodes, and a grid insulation layer. The pattern comprises a plurality of grid electrodes. The substrate equipped with the grid insulation layer is provided with a pattern comprising a semiconductor layer. The substrate provided with the pattern comprising the semiconductor layer is provided with a source electrode pattern and a drain electrode pattern. The pattern comprising the semiconductor layer is connected with the source electrode pattern and the drain electrode pattern. The distance between a first connection point and a second connection point on the pattern comprising the semiconductor layer is greater than the length of any side of the grid electrode. According to the invention, the resistance between the source electrode and the drain electrode is increased through the increase of the distance between the source electrode and the drain electrode, thereby reducing an off-state current, solving a problem that a conventional off-state current at a low updating frequency in related technologies cannot maintain a voltage applied to a liquid crystal display pixel, and achieving an effect of maintaining the voltage applied to the liquid crystal display pixel under the condition of low updating frequency.