However, due to the special nature of the car system, the car display system often has other functions in addition to playing programs, such as automatically displaying the view behind the car when backing up to facilitate backing up. In addition, it may also come with other additional functions such as small speakers and small lighting. As the space inside the car is relatively small, when the car is driving the environment around the car changes a lot, so the car display device may also come with automatic backlight adjustment, anti-glare, automatic angle adjustment and other functions to adapt to the special characteristics of the car.