Electricity controller, device for lighting discharge tube, display device and electric power control method

An electricity controller is provided which comprises a first power control means for controlling output power from power generator to a first level during a first period of start-up time for feeding, a second power control means for controlling output power from power generator to a second level lower than first level during a second period after the first period, and a third power control means for controlling output power from power generator to a third level greater than the second level and lower than the first level during a third period after the second period. A discharge tube is heated during the first period for supplying a large amount of electric power to discharge tube to elevate the tube temperature and thereby uniformly disperse mercury vapor in discharge tube . Subsequently, while the device maintains the tube at a relatively high temperature during the second period for supplying a small amount of electric power to discharge tube, it can effectively reduce and restrict the release amount of infrared ray from discharge tube in order to enable a remote controller to control a display device immediately after the indication.