An active matrix substrate is provided. The active matrix substrate includes a substrate, scan lines, data lines, and pixel units. The scan lines, data lines, and pixel units are all disposed over the substrate. The pixel unit includes an active component, a pixel electrode, and an auxiliary electrode. The active components are electrically connected with the scan lines and data lines. The pixel electrode has openings extended from the edge of the pixel electrode to the interior of the pixel electrode. The auxiliary electrode is electrically connected with the pixel electrode controlled by a previous scan line and includes a body portion and extending portions disposed in the openings. The pixel electrode is electrically connected with the auxiliary electrode of a pixel unit controlled by a next scan line.