Surface mount is also called SMT. The SMT packaged lamp is welded to the surface of the PCB board through a welding process. The lamp pins do not need to pass through the PCB board. The module made by this process is called a surface mount module. The advantages are: good display effect. The pixel density is high and suitable for indoor viewing; the disadvantage is that the brightness is not high enough and the lamp itself does not dissipate heat well enough.