An array substrate has a display area and a circuit area. The array substrate includes a metal layer, a flat layer, a first protective layer, and a conductive layer. The flat layer is on the metal layer. The first protective layer is located on the flat layer, and the first protective layer has an opening portion; the opening portion is located in the display area, and the opening portion exposesthe flat layer without exposing the metal layer. The conductive layer is located on the first protective layer and fills the opening portion to cover the flat layer exposed by the opening portion.