Having only a screen without a corresponding system is also inappropriate. The current mainstream mobile systems are Android and iOS, both of which can achieve many functions. But the core of these systems is optimized for mobile phones and other devices, and directly applied to cars, which is definitely too complex. The system required for cars needs to be simple and stable. Both are indispensable, simplicity can reduce the user's thinking process. In high-speed driving, an overly complex system is obviously meaningless. Stability is the foundation of the system, otherwise, if the system suddenly restarts or crashes while driving, the driver is also very dangerous.