Never? At least not without some sort of ability to give different image for each of your eyes and that would probably involve some glasses and light polarization. Quite hard to achieve. That said I doubt this is as useful as video portrays. Also, this can be named "phone cooker". Can't imagine what summer sun would do to your phone exposed to direct light.
Good point. I guess the technology has been around for ages in fighter plane HUDs, but I'm not sure it can be adapted to reflect a phone screen at infinity.
In order for eyes to look at "infinity" projected image has to be collimated, or in other words make light rays as parallel as possible. Needless to say having this option in phones is useless and in addition to that, having such option for cheap is hard.
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