What is the light-emitting principle of led lights?
Time：
2022-05-18 10:01
Source：
The light-emitting principle of the led lamp is to digitize the input power supply and control the square wave ratio to control the internal current. Through the adjustment of the constant current power supply and the linear technology, the function of current control is realized, and multiple LED groups can be controlled by grouping. Then use the grouper control of the scissors.
The symbol of the LED light-emitting diode in the circuit is very similar to that of the diode, but on the basis of the diode, an arrow indicating light is added. In fact, its physical structure is similar to that of a diode, and there is a small chip on its lamp bead. This wafer is composed of multiple layers, the uppermost layer is a P-type semiconductor layer, and the lowermost layer is an N-type semiconductor layer.
In the middle is the light-emitting layer. If an appropriate forward voltage is applied to the PN layers, the middle light-emitting layer will generate photons visible to the human eye due to the flow of current, which is why it can emit light. At first, the LED was used as a The indicator light source of instruments and meters, and later LEDs of various light colors were widely used in traffic lights and large-area display screens, resulting in good economic and social benefits.
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