hello gentlemen, I had already posted a similar question before but now I have updates, so what I want to create is a projector that can project images to a single person and not to others. So the only question I have to solve as yakoov told me, was to use a collimated beam, on the internet I found various technologies such as the "virtual retina display", which seems to be right for me, I think the problem is very simple to solve but I can't solve it on my own, also I discovered a technology that could do for me like the "laser direct projector mems", so you know what to do?