A rigid circuit board is a type of circuit board with a fixed shape and size, usually made of glass fiber cloth based (FR-4) material. Due to its high strength and good electrical performance, rigid circuit boards are widely used in scenarios that require high stability and reliability, such as motherboards for electronic products such as computers, mobile phones, televisions, etc. Rigid circuit boards have good mechanical strength and can fix various electronic components, ensuring the stability and reliability of the circuit.

　　The advantages of rigid circuit boards are high stability and low cost, which are suitable for most general electronic devices. Its rigid structure can provide good resistance to vibration and impact, which helps improve the stability and reliability of electronic products in use. In addition, the manufacturing process of rigid circuit boards is mature, with relatively low costs, suitable for large-scale production, and is also a mainstream choice in the field of electronic product manufacturing.

　　Flexible circuit board is a type of circuit board made of flexible substrates that can be bent, folded, and twisted. Common flexible substrates include polyimide (PI), polyurea (PUR), etc. Due to its excellent flexibility and plasticity, flexible circuit boards are widely used in scenarios with high requirements for shape and weight, such as wearable devices, foldable screen phones, etc.

　　The advantages of flexible circuit boards are strong shape variability and light weight, which are suitable for the design requirements of special shapes and compact spaces. Due to the flexibility of flexible circuit boards to bend and fold, they can adapt to the design requirements of different shapes and complex layouts, making electronic products more lightweight and flexible. In addition, the weight of flexible circuit boards is relatively light, which helps to reduce the overall product weight and improve the convenience of carrying and using.