[dannyr]

"Current devices in the car cannot cover the centre of your view with some graphics."

Have you seen the Glass videos? The screen is on the top right of your view.

[viraptor]

Ok, not the complete centre. The display I've seen in all videos takes up around 1/9th of the image - I'm not sure how it translates to normal field of view. But imagine that 1/9th of your view starts flickering - that would be rather annoying and noticeable, right?