An array substrate, a touch screen panel and a display device are provided. The array substrate includes a plurality of gate lines, a plurality of data lines, a plurality of touch sensing units, and each touch sensing unit comprises a touch scanning line, a touch sensing line, a first transistor and a sensing electrode, the touch scanning line is connected with a gate electrode and a drain electrode of the first transistor and the sensing electrode is connected with a source electrode of the first transistor; the touch sensing line and the sensing electrode are provided in different layers, spaced apart by an insulating layer and have an overlapping region. This array substrate decreases areas of non-display regions on the array substrate, increases aperture ratio of the touch screen panel and in turn enhances brightness of the display device.