Abstract
The design of a back-lighting system for color LCDs using hot cathode fluorescentlamps requires consideration of the lamps' life, heat evolution and thin making. We developed a long life hot cathode fluorescent lamp whose diamiter is 10 mm. The improved cathode design, installation of getter and pre-heat operation brought about an excelent long life of more than 5000 hrs. under continuous operation and 60000-80000 cycles under flickering test. We described the practical heat design of the back-lighting system. The center-gap cored transformer of the inverter contributed to lowering the heat evolution of the system, when the inverter was packed in a chassis to keep the display system off an electro-magnetic interference. As the exhaust tip of the lamp was settled outside the lamp house, the lamp was easy to re-start at high surface temperature of the lamp above 100°C. The lamp showed good adaptability to edge-lighting of a thin back-lighting system with little increase in temperature of the illumination surface. Moreover we discussed the possibility of the possibility ofthe application of this system for a re-chargable battery driven hand-held conputer.
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