Array substrate and method of manufacturing the same, and display device

A method of manufacturing an array substrate, comprising steps of:

• forming a semiconductor material film, a first insulation material film and a first conductive material film successively on a base substrate, and processing the semiconductor material film, the first insulation material film and the first conductive material film through a single patterning process so as to form an active pattern, a gate insulation pattern and a gate electrode;
• forming a second insulation layer over the active pattern, the gate insulation pattern and the gate electrode, and forming a first contact hole and a second contact hole through a single patterning process, each of the first contact hole and the second contact hole penetrating through the gate insulation pattern and the second insulation layer so as to expose portions of the active pattern;
• forming a second conductive material film with portions thereof being filled into the first contact hole and the second contact hole, and forming an electrically conductive first contact structure and an electrically conductive second contact structure from portions of the second conductive material film, the first contact structure comprising a portion located in the first contact hole and contacting the corresponding exposed portion of the active pattern, the second contact structure comprising a portion located in the second contact hole and contacting the corresponding exposed portion of the active pattern;
• and
• forming a third conductive material film to directly cover the second conductive material film and the first contact structure and the second contact structure, and processing the third conductive material film and the second conductive material film through a single patterning process so as to form a pixel electrode, a source electrode and a drain electrode, the source electrode and the drain electrode being in direct contact with the first contact structure and the second contact structure respectively.