A liquid crystal display module includes a printed circuit board (PCB), a top case installed to cover the upper edge and side surface of the liquid crystal display module, a variable resistance lead part exposed at the front of the top case and controlling common voltage level for preventing a flicker phenomenon from being induced, a brace installed at the side surface of the top case, and at least one protrusion formed at the side surface of the top case and at the area adjacent to the variable resistance lead part.