But what you probably haven't seen is this euro cent-sized projector created by crafty German engineers at the Fraunhofer Institute for Applied Optics and Precision Engineeringin Jena.
Its 25 people include a PhD in Electrical Engineering who is an expert on fiber optics, an aerospace engineer, and a computer scientist with a string of entrepreneurial successes in his wake.
The hinge technology will have to be an engineering marvel, and making the folding crease of the screen invisible will pose problems in materials, optics, and touch technologies.