Frankly speaking, the design of rigid-flex board is much more complicated than other traditional PCB design so that there are plenty of aspects that we should pay attention to, such as rigid-flex transitional areas, related routing, vias design, etc.

In other words, the rigid-flex PCB design has to follow the requirements of corresponding design rules like:

1. The location of vias

2. The design of pads and vias

3. Routing design

4. Copper laying design

PS: Rigid-flex PCB tends to be used in certain products with special requirements, which is of great help to save product internal space, reduce finished product volume and improve product performance.