Abstract: The invention discloses an array substrate and a driving method thereof, and a display device, and the array substrate includes: a common voltage generation unit, a timing control unit, a data voltage generation unit, a switch control unit and pixel units, wherein the switch control unit is connected to the common voltage generation unit, the timing control unit, the data voltage generation unit, the common voltage line and the data line, and the switch control unit is used to load a common voltage signal on the common voltage line and load a data voltage signal on the data line when a current frame of image is displayed, and load the common voltage signal on the data line and load the data voltage signal on the common voltage line when a next frame of image is displayed.

Abstract: A method and a system for improving saturation degree of a RGBW image are provided. The method comprises: a step A of dividing a screen into a plurality of screen sub-regions according to a region range in which backlight is independently and dynamically adjustable; a step B of dividing the RGBW image to be displayed into sub-areas on the basis of the screen sub-regions, the sub-areas of the RGBW image to be displayed corresponding to the screen sub-regions; a step C of determining the sub-areas having saturation degree to be adjusted in each sub-area of the RGBW image to be displayed; and a step D of reducing backlight brightness of the sub-areas having saturation degree to be adjusted by a predetermined proportion when the RGBW image to be displayed is displayed. By means of the method and the system, saturation degree of the RGBW image may be adjusted finely.