Windshields of cards would become (at least) the first generation of displays when AR gets popular.
totally new experience of navigation UI. Directions can be directly "printed" on the ground. Street names would be directly "printed" on the street. No need to wait for the next intersection to see the street sign. Poor vision at night or bad weather, no problem!
Traffic signs and temporary notices can be very easily deployed and changed. The visibility of those signs are superb.
Improve safety. In combination of other technologies such as in-car radar, blocked objects can be displayed on your windshield. if you are driving behind a big trailer which almost block anything ahead of you, you can "see through" the trailer and be aware of any hazards ahead of you.
In order to project 3-D objects on the windshield, only one projector may not be enough -- you need to project (slightly) different views of the same object for two eyes so that you can cheat your eyes and brain to think that direction arrow is actually printed on the ground, not on your windshield. Probably views at a distant distance are easier because they might only need the same image.
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