A liquid crystal display is disclosed. The liquid crystal display includes a liquid crystal display panel on which a plurality of data lines and a plurality of gate lines are positioned to cross one another and a plurality of liquid crystal cells driven according to a voltage difference between a data voltage and a common voltage are positioned in a matrix format, a side printed circuit board (PCB) connected to the side of the liquid crystal display panel, and a DC to DC converter that is mounted on the side PCB to produce a driving voltage of the liquid crystal display panel.