An array substrate provided. Since arranging a second metal layer into a grid structure, the grid structure and a constant voltage signal trace disposed on a third metal layer are connected in parallel, and a storage capacitor is used as a connection point for the grid structure. The grid structure ensures a high pixel density and also reduces voltage drop, thereby improving brightness uniformity. Moreover, in the manufacturing process, the grid structure and the second metal layer can be formed simultaneously, thereby eliminating a need for additional processes and saving cost.