Understand from the perspective of physics: when the current passes through the wafer, the electrons in the N-type semiconductor and the holes in the P-type semiconductor violently collide and recombine in the light-emitting layer to generate photons, which emit energy in the form of photons (that is, the light that everyone sees) .

led

LEDs are also called light-emitting diodes, which are small and fragile, making them inconvenient for direct use. So the designer added a protective case to it and sealed it inside, thus forming an easy-to-use LED lamp bead.

After connecting many LED lamp beads together, various LED lamps can be formed.