In the laser process, some metal traces will form overlapping parts. When two metal traces with overlapping parts need to be short-circuited, they are usually connected by the overlapping part of the laser signal line and the functional trace. However, in the laser of the prior art, the laser quality is often poor, which leads to the problem that two metal wires are not connected or even disconnected.

Laser is the light excited by atoms, which was first discovered by Einstein in 19 16.