The RC controller with integrated screen, such as the DJI RC, does not have a connection for an external smart device to display the live image on a larger screen. The image is displayed directly on the controller's integrated screen. If you want to use a larger display, you could consider connecting the drone to a mobile device via the DJI Fly app, but this is not possible directly with the DJI RC controller as it does not require a connection for a mobile device.