An array substrate is provided. The array substrate comprises a substrate, a common electrode, an insulating layer, a pixel transparent electrode, and a sharing capacitor transparent electrode, wherein a separating area is disposed between the pixel transparent electrode and the sharing capacitor transparent electrode; the common electrode extends to the separating area, and is exposed on the surface of the separating area by at least one groove which is on the insulating layer. Thereby a defectiveness of a product due to an ITO (indium tin oxide) remaining on the surface of the array substrate can easily detected.