Embodiments of the present invention provide an array substrate and a fabrication method thereof, and a display device, the array substrate comprises gate lines, data lines, and pixel units defined by the gate lines and the data lines crossing with each other, and each pixel unit comprises a first TFT, whose gate is electrically connected with the gate line, wherein each pixel unit further comprises an auxiliary turn-on structure for forming a turn-on voltage at a channel of the first TFT when the first TFT is switched into conduction. In the embodiments of the present invention, a dual-drive voltage for the first TFT is formed by the auxiliary turn-on structure together with the gate of the first TFT, so that when the turn-on voltage provided by the gate lines is relatively low, the channel of the first TFT can also be turned on, therefore lowering power consumption.