A protecting module for protecting a liquid crystal display module of a portable electronic device. The protecting module includes an electrical field shielding plate and a rubber gasket. The electrical field shielding plate defines a holding portion to receive the liquid crystal display module. The holding portion includes a bottom wall and a plurality of connected sidewalls extending from the bottom wall. The rubber gasket defines a slot to receive the bottom wall and the plurality of connected sidewalls. The liquid crystal display is received into the holding portion and resists against the rubber gasket.