Wouldn't that often just be easier if it were your phone, so you didn't have to carry multiple devices?
Though I haven't tried the Ubuntu Touch stuff, so maybe that is the right solution.
Pluging an HDMI or USB dongle into a display is pretty simple, I suspect pairing with your phone would be more difficult, or would require cables and such.
http://www.phonearena.com/reviews/Motorola-ATRIX-4G-Laptop-D...