A wheelchair motorizing apparatus employs an articulated tread drive in combination with front support wheels and rear drive wheels. Car support rollers are arranged beneath an underside of an elevator car in the area of points of the underside of the elevator car located opposite each other and are connected to the elevator car. If the link port is not terminated, the link supply power may be reduced to a value that does not preserve logic states of a plurality of link port elements, and, if the link port is terminated, the link supply power may be maintained substantially at Vcc. When the detected temperature is determined to be low, a scanning direction in which a voltage is applied to the scan electrodes is controlled such that the plasma panel is scanned from both ends to the center. The heat-dissipated plate is disposed on the first protrusion and is brought into contact with the driver IC package.