Liquid crystal display device free of upper substrate electrode and driving method thereof

A liquid crystal display device free of upper substrate, comprising:

• a plurality of pixels;
• a plurality of data lines for providing data to the pixels therethrough, a specified one of the plurality of data lines being electrically coupled to a specified group of pixels selected from the plurality of pixels, wherein two adjacent pixels in the specified group are disposed oppositely relative to the specified data line;
• a plurality of gate lines for controlling timing of transferring data from the plurality of data lines to corresponding ones of the plurality of pixels;
• a plurality of common lines, electrically coupled to corresponding groups of pixels selected from the plurality of pixels, respectively;
• and
• a common voltage supply unit, electrically coupled to the plurality of common lines for independently providing a voltage level to each of the plurality of common lines, wherein the voltage level is changed from a first level to a second level before data are written into the group of pixels electrically coupled to the corresponding common line, and kept at the second level after data are written into the group of pixels electrically coupled to the corresponding common line.