Array Substrate and Manufacturing Method Thereof, Display Panel and Display Device

A manufacturing method of an array substrate, the array substrate including a plurality of pixel units, each of which includes:

• a thin film transistor (TFT) area provided with a thin film transistor including a gate, a gate insulation layer, a source, a drain and an active area;
• and a display area provided with a pixel electrode, wherein the manufacturing method of an array substrate includes steps of:
• forming a pattern including the gate on a substrate through a patterning process, and forming the gate insulation layer;
• forming patterns including the active area and an etching stop area provided on the active area through a patterning process, on the substrate subjected to the above step;
• forming a transparent conductive layer film, and forming patterns including the source and the drain from the transparent conductive layer film through a patterning process;
• and
• forming a pattern including the pixel electrode from the transparent conductive layer film through a patterning process.