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led, should focus on the ac-driven products, like lighting, television backlighting, entrance lights landscape lighting landscaping and architectural applications. manufacturers also need to actively develop related application markets, to differentiate their packaging technology and products, made their chances of survival in the market. figure ix ac led application research alliance development source: itri eol; extension?? research institute organize, 2008/11 because the ac led industry needs to actively expand the application side, the institute together with the industry in 2008 october set up "ac led application research alliance", currently only in the upstream end of the tripod element crystal electricity and access to the institute patents, packaging aspects of the first trial production from howard, and then joined the lite package together and the high base technical sophistication.led sign board
as we all know, led luminous efficiency is high, but also because of small size and by the designers preference. but only when not consider thermal management, they only really "small." although the incandescent light up to operating temperature compared to 2500 , led light source temperature is much lower. therefore, many designers finally realize that heat is a big problem. although the led also produce heat, but it is not very high, relatively speaking, so cooling of the led itself is not a problem. however, the work of driving led operating temperature of semiconductor devices to allow less than 100 . according to energy conservation, energy must be transferred to the surrounding area. led only use 100 and 25 ambient temperature of hot spots between the temperature of a small space, so only 75 kelvin. as a result, need to use a large cooling surface and powerful management.led message displays
the work environment if the temperature is high, led's life will be drastically reduced. led fence tube strength of the company will certainly be hot designers in the design of led guardrail tube to the heat and constant heat from the chip lead effectively to the atmosphere. we should think of using aluminum is a better solution, high thermal conductivity of aluminum, can effectively export the internal heat. also in the design and we should try to close aluminum pcb base, thus reducing the thermal resistance produced some potting. led message display