FPC is a kind of printed circuit board, which is called flexible circuit board, and we call it FPC soft board. FPC generally uses PI as the base material, which can be bent and flexed arbitrarily. PCB is a so-called rigid circuit board, which is usually called a hard board. PCB generally uses FR4 as the base material, and it cannot be bent or flexed. FPC flexible circuit boards are used in links that require repeated flexing and some small parts. PCB rigid circuit boards are often used in places that do not require bending and have relatively strong strength.

FPC flexible circuit board is not only a circuit board that can be flexed, but also an important design method for the integrated circuit structure. This structure can be used with other electronic product designs to build a variety of different applications. For PCB rigid circuit boards, unless the circuit is made into a three-dimensional form by means of grouting glue, otherwise the circuit board is generally flat. Therefore, the design of electronic products should make full use of the three-dimensional space, FPC flexible circuit board is a good solution. The common space extension scheme for PCB rigid circuit boards is to use slots and interface cards. FPC flexible circuit boards can be made with similar structures as long as they are designed by transition, and they are more flexible in directional design.

FPC flexible circuit boards can be connected by terminals, but soft and hard boards can be used to avoid these connection mechanisms. Using one piece to connect FPC can connect two pieces of hard boards into a set of parallel circuit systems, or can be turned into any Angle to adapt to the shape design of different products. A single FPC can use layout to configure a lot of hard boards and connect them. This approach reduces connector and terminal interference, which can improve signal quality and product reliability.