Most of the Navigation devices, such as Garmin, use screens of different types.
But we want to make the simplest possible display to show the direction, distance or when to turn. There is no need for complex symbols or extra information that just distracts from the road.
The LED display has probed to be extremely good for this. Without having to interpret symbols or numbers, you can understand your situation extremely fast, and keep your attention on the road. It is a very intuitive way of providing information.