The present invention discloses an array substrate and a display device. The array substrate comprises a data line and a gate line arranged crossly, a thin film transistor being arranged in vicinity of a cross position of the data line and the gate line, the thin film transistor comprising a gate and a source, the gate being connected with the gate line, the source being connected with the data line, an orthographic projection of the source on a base substrate of the array substrate partly overlapping with an orthographic projection of the gate on the base substrate of the array substrate. The array substrate provided by the present invention can reduce the parasitic capacitance generated between the source and the gate of the thin film transistor, thereby being capable of reducing delay of the gate line signal so as to improve the display quality.