The invention relates to a touch pad user interface input device in a mobile terminal, and especially to the embodiment, where the touch pad UI is arranged into the back side of the mobile terminal in use so that a user can see the display side of the mobile terminal in the field of vision, support the...http://www.google.de/patents/US20040263484?utm_source=gb-gplus-sharePatent US20040263484 - Multifunctional UI input device for moblie terminals
