As with most patents, there's no certainty that Ford will ever use this. While the car maker is serious about autonomous vehicles, it could just as easily resort to flat-panel displays and other less dramatic hardware. There are some safety concerns, too. Do you really want the driver to be completely oblivious to road hazards? For this to work, driverless car tech will have to advance to the point where it's truly reliable -- where you can watch a 2-hour flick without worrying that your car might plow into a bus.