In a flat panel display (FPD), a conductive heat proof plate is inserted between the back surface of a display panel, on which printed circuit boards (PCBs) and signal lines are formed, and signal lines. A back frame positioned on the back surface of the display panel is provided to cover the printed circuit boards and the signal lines. A shield can is formed in the internal surface region of the back frame corresponding to the printed circuit board on which a timing controller is mounted. The shield can is electrically coupled to the heat proof plate to improve resistance against the electromagnetic compatibility of a large flat panel display and to improve a thermal characteristic.