Liquid crystal display device

A liquid crystal display device comprising:

• scanning lines extend in a first direction and arranged in a second direction,
• video signal lines extend in the second direction and arranged in the first direction,
• pixels formed in respective regions enclosed by the scanning lines and the video signal lines,
• a pixel electrode and a thin-film transistor (TFT) formed in each of the pixels, and
• a first insulating film formed between a common electrode formed in common for a plurality of pixels and the pixel electrode, wherein
• the pixel electrode is connected to one of the video signal lines via the TFT,
• the TFT has a gate connected to one of the scanning lines,
• a constant common voltage is supplied to the common electrode,
• the scanning lines are sequentially scanned from a first scanning line in one frame,
• the one frame is divide into a refreshing period that a predetermined voltage is applied to all the scanning lines before a scanning signal is applied to the first scanning line, a blanking period to maintain data written to each pixel, and an active period to scan the scanning lines.