Camera Hidden Digital FPC Flexible Printed Circuit Board What is Flexible PCB Flexible PCB (FPC), also called a "soft board" or flexible circuit, is a type of printed circuit board (PCB) made from flexible insulating materials, such as polyimide (PI) or polyester (PET), instead of rigid fiberglass (FR4). This unique construction allows FPCs to bend, fold, and twist without breaking, enabling compact, lightweight, and space-saving designs in modern electronics. Advantages of