Embodiments of the present disclosure provide an OLED array substrate, a method for fabricating an OLED array substrate, an OLED pixel circuit, an OLED array substrate including the OLED pixel circuit, and a display device including the OLED array substrate. The OLED array substrate includes a substrate, an OLED arranged on the substrate, and a photosensor positioned between the OLED and the substrate. The photosensor includes a first electrode, a photosensitive layer, and a second electrode sequentially arranged from bottom to top. The OLED includes an anode, an organic light-emitting layer, and a cathode sequentially arranged from bottom to top. The anode includes a first portion and a second portion.