The size of the screen on your car's new DVD player is truly limitless. You can go as big as you want as long as it doesn't block your view of the front or back of the car or detract from the overall aesthetics of your vehicle.
A wide 13-inch screen is ideal for vans and SUVs, but the same cannot be said for a small compact sedan. The amount of space available on the console would also restrict in-dash systems.