There are significant differences in usage between rigid circuit boards and flexible circuit boards. Rigid circuit boards are suitable for scenarios with high requirements for stability and reliability, while flexible circuit boards are suitable for scenarios with high requirements for shape and weight. Rigid circuit boards have a fixed shape and size, which can provide good stability and mechanical strength, making them suitable for most general electronic devices. Flexible circuit boards can be bent and folded according to design requirements, with strong shape variability, making them suitable for products with special shapes and lightweight designs.

　　With the continuous development and innovation of electronic products, the application prospects of rigid circuit boards and flexible circuit boards in different fields are becoming increasingly broad. Rigid circuit boards still dominate traditional large electronic devices, but the application of flexible circuit boards in wearable devices, foldable screens, and other fields is becoming increasingly important. In the future, with further breakthroughs and innovations in technology, there may be more cross applications and hybrid applications between rigid circuit boards and flexible circuit boards to meet the needs of different scenarios.

　　By elaborating on the different uses of rigid circuit boards and flexible circuit boards, we can see that they have different application fields and characteristics in electronic products. Rigid circuit boards are suitable for scenarios with high requirements for stability and reliability, while flexible circuit boards are suitable for scenarios with high requirements for shape and weight. However, with the continuous progress of technology, the application boundary between the two may become blurred, and more innovation and development will bring new possibilities to electronic products.