Why emphasize PCB first in led screen?

"Crucially"important

Printed circut board(PCB)mechanically support and electrically connects components using conductive tracks,pads and other features.If we compare PCB'A function as a busy urban traffic,PCB would be the road infrastructure.It is the foundation of led display's quality,efficiency,reliablity and durability.

Attentions paid "not enough"

However when we buy led displays,many customers due diligence to pcb is not performed enough.It is also a usual way for the manufacturers who make low cost and inferior led displays,to "cut corner" with using bad quality pcbs.Their screens may seem good too at the beginning,but would not work properly just in one year or less.

A gambling

As a result of terrible price competition,to reduce cost,currently many manufacturers use 2 copper layers pcbs and with very thin copper foil.It is acceptable to big pixel pitch indoor led displays,but in the case of outdoor fixed led displays,it is gambling!

The PCBs of outdoor led displays are exposed to thermal changes of their working environment.Due to different CTE(coefficient of thermal expansion) between copper and PCB substrate(which is usually FR-4 glass epoxy),the copper expands and contracts 1/4 less than substrate,inducing cyclic fatigue in the copper on circuit traces and vias.Too thin copper on circuit traces and viaswill eventually crack and result electrical open.And it usually happens months (or even longer) after the installation,and massively!

We adopt 4 copper layer PCBs,with optimized circuit traces designed in 2 outer layers,and 2 inner layers,in addition with perfect electrical and thermal conductivity given by 1 oz copper per sq.ft,the heat transfers along and across PCB,and avoid micro fractures caused by uneven heating.The overall board thickness is 1.6mm,supporting components with high mechanical strength,and ensure perfect flatness of LEDs matrix.

PAY EXTRA ATTENTION

Here is an easy way to identify 2-layer PCB and multi-layer PCB:turn your mobile phone's flashlight on,cover the light with PCB and check if the board transmit light.

TIPS:A proper due diligence is helpful for you to get the best led signs & digital billboard.We hope it would be helpful for you to make a successful purchase!