A display panel, an array substrate and a method of forming the same are disclosed. The array substrate includes a plurality of pixel regions, each of the pixel regions includes a pixel electrode and at least one oxide film transistor. An input terminal of the pixel electrode is connected with an output terminal of the oxide film transistor, a control terminal of the oxide film transistor is connected with a scan line, an end of the scan line is connected with a drive circuit, and the oxide film transistor further includes a gate insulation layer disposed on a gate thereof. A thickness of the gate insulation layer is inversely proportional to a length of the scan line, which is connected with the corresponding gate, from a connection point with the drive circuit to a connection point with the gate.