Lenovo is coming up with a new tablet for this Holidays 2014 with a built in projector on the new Yoga tablet 2 Pro.
You can project everywhere and anything of what you have on the tablet display. It would be very good for business presentations.
The video below by CNET shows an Android OS on the tablet and it has a 13 inch display.
The built in pico projector is located in its rounded kickstand hinge.