Array substrate, manufacturing method thereof and display device

A manufacturing method of an array substrate, comprising:

• forming a pixel electrode, a gate electrode, a first metal connection layer, a gate insulating layer, an active layer and a first leading wire hole through a first patterning process;
• forming a source electrode, a drain electrode, a second metal connection layer and an insulating protection layer through a second patterning process, and the drain electrode being connected with the pixel electrode through the first metal connection layer provided in the first leading wire hole;
• and
• forming through a third patterning process a common electrode which is connected with a common electrode line through the second metal connection layer provided in a second leading wire hole.

A manufacturing method of an array substrate, comprising:

• forming a common electrode, a gate electrode, a common electrode line, a gate insulating layer and an active layer through a first patterning process;
• forming a source electrode, a drain electrode and an insulating protection layer through a second patterning process, and the insulating protection layer being provided with an insulating protection layer through hole;
• and
• forming through a third patterning process a pixel electrode which is connected with the drain electrode through the insulating protection layer through hole.