1, the light source is different:
Laser and ordinary light, sunlight is different, it has a good direction, pure color, energy and other physical characteristics. In the clinical application of laser medicine, there is a strong laser and weak laser distinction.
LED light source is a new type of light source in the laser family, belonging to the category of "weak laser", which is considered to be one of the most ideal medical light sources for human beings in the future.
2, different impact on the organization:
Laser irradiation of biological tissues, if directly caused by the irreversible damage to the biological tissues, the laser light at the surface is called a strong laser; if it does not directly cause irreversible damage, it is called a weak laser.
LED light source itself does not contain mercury, lead and other harmful substances, no infrared and ultraviolet pollution, will not produce in the use of the outside world of pollution. LED science called light-emitting diode, referred to as the LED, is able to convert electrical energy into visible light of the solid-state semiconductor device, which can be directly converted into electrical energy into light energy.
The unit board is one of the core components of the LED display, the unit board is good or bad, directly affecting the display effect. The unit board consists of LED module, driver chip and PCB circuit board, LED module, in fact, by many LED light-emitting points with resin or plastic encapsulation up the array.
Expanded information:
From the physics point of view to understand: LED lights when the current through the wafer N-type semiconductor electrons and P-type semiconductor holes in the light-emitting layer of intense collision compound to produce photons, in the form of photons of energy (i.e., everyone sees the light).
Laser as a kind of light, and other luminous as in nature, is produced by the atom (or molecules, ions, etc.) jump, and is caused by spontaneous radiation. The difference is that ordinary light sources are produced by spontaneous radiation from beginning to end, and thus contain components of different frequencies (or different wavelengths, different colors) that propagate in all directions.
Lasers, on the other hand, depend on spontaneous radiation only for a very short time initially, and thereafter the process is entirely determined by excited radiation. It is for this reason that lasers have a very pure color, almost divergence-free directionality, and extremely high luminous intensity. And it is these amazing properties that give lasers an incredible and compelling array of applications in a variety of fields.
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