The Hong Kong Applied Science and Technology Research Institute (ASTRI)'s portable interactive surface can carried anywhere and enables you to project a fully function from a variety of different devices such as Android devices. The surface can be as large as 20". The device received a Hong Kong ICT award for 2014. Astri also makes a headmounted display. Unfortunately the demo is somewhat buggy.
Filmed at the HKTDC Hong Kong Electronics Fair (Spring Edition) 2014