Today’s invention is a screen mounted on the underside of a car’s bonnet.
Once the bonnet is opened, the screen has projected onto it movies of detailed maintenance procedures with descriptive overlays (and even, using motion detecting cameras, clickable links to sources of parts etc).
Movies could be shown of factory experts actually undertaking particularly difficult tasks (and engine compartment cameras might be used to create films of events in the service history of a given vehicle).
This screen could also be used for providing entertainment to the passengers during rest stops.
Used in an armoured limousine with forward facing cameras, the screen could be flipped up when the vehicle was under attack and driven forwards using realtime images of the road ahead.