In at least one embodiment of the present invention, deterioration of display quality is prevented from occurring in a display device provided with an active matrix substrate even when a larger size or a higher resolution is employed and a drive frequency is increased. In an active matrix substrate of a liquid crystal display device, a charge sharing control signal line is disposed so as to be arranged along each gate line and charge sharing TFTs are provided for each source line in numbers equal to the number of the gate lines. The gate terminal of the charge sharing TFT is connected to the charge sharing control signal line and the source and drain terminals are connected with neighboring source lines via connection electrode portions, respectively. Each of the charge sharing control signal lines is provided with a signal which turns on the charge sharing TFT for a predetermined period of every one horizontal period.