Array substrate and liquid crystal display

The utility model discloses an array substrate and a liquid crystal display. The array substrate consists of an substratum substrate; data lines and grid lines which are horizontally and longitudinally crossed are arranged on the substratum substrate; the data lines and the grid lines form sub-pixel units which are arranged in an array manner in an enclosing way; each sub-pixel unit consists of a TFT (thin film transistor) switch, a pixel electrode and a public electrode, as well as public electrode lines which are arranged at the same layer of the data lines at intervals, the public electrode lines are respectively connected with the public electrodes in all sub-pixel units. For the array substrate and the liquid crystal display, the public electrode lines and the data lines are arranged at the same layer and at intervals, so that the number of the public electrode lines is consistent with that of the data lines, the number of the public electrode lines is reduced when the product cost is reduced by increasing the grid lines and the data lines, and the aperture opening ratio of pixel units can not be reduced excessively, so that the reduction of transmissivity and the increase of driving power consumption can be avoided.