The principle of LED advertising screen
Author:Dong Haiying Time:2021-09-07 14:41 Browse(391)
Henry, 1907
In 1907, Henry Joseph round first observed electroluminescence in silicon carbide. The first commercial diode was produced in 1960. LED is the abbreviation of light emitting diode (LED). Its basic structure is an electroluminescent semiconductor material, which is placed on a bracket with leads, and then sealed with epoxy resin to protect the internal core wire, so the LED has good seismic performance
the core part of LED is a wafer composed of p-type semiconductor and n-type semiconductor. There is a transition layer between p-type semiconductor and n-type semiconductor, which is called p-n junction. In some semiconductor PN junctions, when the injected minority carriers are combined with the majority carriers, the excess energy will be released in the form of light, thus the electric energy can be directly converted into light energy. When the reverse voltage is applied to the PN junction, it is difficult to inject a few carriers, so it does not emit light. The use of injection electroluminescence principle of the production of LED called light-emitting diode, commonly known as LED. When it is in the positive working state (that is, the positive voltage is applied at both ends), when the current flows from the LED anode to the cathode, the semiconductor crystal will emit different colors of light from ultraviolet to infrared, and the intensity of light is related to the current.

The principle of LED advertising screen

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