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The LED display can directly convert electricity into light. It changes the principle of incandescent tungsten filament light and energy-saving lamps three-color powder light, and uses electric field light.
The characteristics of LED display are very obvious, long life, high luminous efficiency, no radiation and low power consumption. The spectrum of the LED display is almost all concentrated in the visible light band, and its luminous efficiency can exceed 150lm/W (2010). Comparing the LED display with ordinary incandescent lamps, spiral energy-saving lamps and T5 three-primary fluorescent lamps, the results show that the luminous efficiency of ordinary incandescent lamps is 12lm/W, the lifespan is less than 2000 hours, and the luminous efficiency of spiral energy-saving lamps is 60lm/W, The lifespan is less than 8000 hours, the T5 fluorescent lamp is 96lm/W, and the lifespan is about 10000 hours, while the luminous efficacy of the white LED display with a diameter of 5 mm can theoretically exceed 150lm/W, and the lifespan can be greater than 100000 hours. Some people also predict that the upper limit of LED life in the future will be infinite.
The heart of the LED display is a semiconductor chip,
One end of the LED display (12 sheets) chip is attached to a bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply, so that the whole chip is encapsulated by epoxy resin. The semiconductor wafer consists of two parts, one part is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, where electrons are mainly. But when the two semiconductors are connected, a P-N junction is formed between them. When the current acts on the wafer through the wire, the electrons will be pushed to the P region, where the electrons and holes recombine, and then emit energy in the form of photons, which is the principle of Jinan LED display light. The wavelength of light, which is also the color of light, is determined by the material that forms the P-N junction.
The original LED display was used as an indicator light source for instruments and meters. Later, LED displays of various light colors were widely used in traffic lights and large-area displays. Color led display and other types have produced good economic and social benefits.
