The present invention discloses a liquid crystal display device which can improve quality of image by reducing a leakage current by a backlight, and a fabrication method thereof. The liquid crystal display device includes: a substrate; a plurality of gate lines aligned on the substrate in a direction; gate electrodes connected to the gate lines; a plurality of data lines for defining a plurality of pixels by vertically crossing the gate lines; source electrodes and drain electrodes formed on the gate electrodes and separated from the data lines with a predetermined gap; pixel electrodes formed in the pixel regions and electrically connected to the drain electrodes; connecting patterns for electrically connecting the data lines to the source electrodes; and semiconductor layers disposed between the gate electrodes and the source/drain electrodes.