The present invention provides a liquid crystal display device which can simplify patterning steps of signal wirings and electrodes during manufacture and can enhance the reliability by preventing the electrolytic corrosion of terminal portions or the like. A battery pack is disposed in the battery pack compartment. The particles formed by the abrading operation may be deposited into at least some of the pores of the substrate to form a support structure for the direct depositing of a catalyst onto the abraded surface.