An array substrate includes first and second gate lines, a data line, a pixel electrode, a shield electrode, a first driving transistor, a second driving transistor and a voltage-varying transistor. The pixel electrode has first and second pixel parts spaced apart from each other. The shield electrode covers a peripheral area of the pixel electrode. Each of the first and second driving transistors is electrically connected to the first and second pixel parts, respectively. The voltage-varying transistor includes a voltage-varying drain electrode having a shield-overlapping part overlapping the shield electrode. The voltage-varying transistor is electrically connected to the second gate line and the second pixel part. The voltage-varying drain electrode of the voltage-varying transistor overlaps the shield electrode to define a voltage-decreasing capacitor. The voltage difference between the first and second pixel parts of the pixel electrode may be increased.