Setting the corresponding projector program in accordance with the dual screen display function of Android operating system, therefore, it is only necessary to install another vehicle display to show video to passengers. Generally, Android central controller is used for projector program. The large screen is the operation interface (main screen) of projector, and video playback directly automatic output on vehicle display (secondary screen). The use experience is extremely good. In addition, since it is easy to connect with Android device, the music and video images of projector can also be downloaded via the Internet, making the application more convenient.