An array substrate, a display device and a control method thereof are disclosed. The array substrate includes a plurality of gate lines and a plurality of data lines which are intercrossed to define pixels arranged in an array. The gate lines include n gate line groups and n+1 main gate lines; each gate line group includes a first gate line and a second gate line which are adjacent to each other; the first gate line is provided corresponding to a first transistor, and the second gate line is provided corresponding to a second transistor and a switching element; both the first gate line and the second gate line in the ith gate line group are connected with the ith main gate line; a gate electrode of the first transistor is connected with the first gate line, a source electrode connected with a corresponding data line, a drain electrode connected with a pixel electrode; a gate electrode of the second transistor is connected with one end of the switching element in a pixel unit, a source electrode connected with a corresponding data line, a drain electrode connected with a pixel electrode; and the other end of the switching element is connected with a main gate line in the (i+1)th row and configured to control on/off operation of the second transistor.