Liquid crystal display device and driving method thereof

A liquid crystal display (LCD) device, comprising:

• a liquid crystal display panel, comprising multiple gate lines, multiple data lines and multiple pixels having a common electrode, the data lines intersecting with and electronically isolated from the gate lines;
• a gate driving circuit to successively send gate-scanning signals to the gate lines, respectively;
• a common voltage generating circuit to send a common voltage to the common electrode;
• and
• a data driving circuit to send a gray level voltage signal to the data lines while one of the gate lines is being scanned, the gray level voltage signal comprising multiple voltage levels sent to the data lines, respectively;
• wherein the common voltage comprises at least two square waves comprising at least two non-identical periods, wherein each of the at least square waves corresponds to a frame period and has a substantially constant period.