The invention relates to the technical field of thin film transistor preparation methods, and discloses an array substrate, a display panel and a display device. The array substrate comprises a substrate and a driving transistor formed on the substrate. the driving transistor comprises a shielding metal layer, a grid metal layer, an insulating layer and a source-drain metal layer which are sequentially formed on the substrate, the grid metal layer is located between the shielding metal layer and the source-drain metal layer, a hollow structure is arranged at the position, used for being matched with the grid metal layer to form a capacitor, of the source-drain metal layer, and the orthographic projection of the hollow structure on the substrate is located in the orthographic projection ofthe grid metal layer on the substrate. According to the array substrate, the source-drain metal layer is provided with the hollow structure, and the source-drain metal layer and the gate metal layer can form a shading structure, so that the illumination stability of the thin film transistor is ensured, and the detection and analysis of the gate metal layer are also facilitated.