Provided are an array substrate, a manufacturing method therefor, a display panel and a display device. The array substrate includes: a photosensitive member and a thin film transistor that are located on a base substrate, the photosensitive member including a photosensitive layer; the thin film transistor is located at a side of the photosensitive member that is far from the base substrate. In the described array substrate, the photosensitive member is formed first, and then the thin film transistor is formed on the photosensitive member, which prevents the element hydrogen from influencing the thin film transistor when forming the photosensitive member, while source and drain layer patterns of the thin film transistor may be formed by means of one-time pattern processing, thus simplifying the manufacturing process.