Patent ID: 8519962

Claim:
A mobile terminal comprising: a main body comprising a wireless communication module; a wireless keypad configured to operate in a tactile manner in order to input information via the main body; and a driving unit configured to control the wireless keypad using power of the main body, wherein the driving unit comprises: a first electrode located in the main body and a second electrode located in the wireless keypad; an electric field formation unit located in the main body and configured to apply voltage to the first electrode to generate an electric field between the first and second electrodes; and a controller located in the main body and configured to detect information related to a touch applied to the wireless keypad based on a change in the electric field between the first and second electrodes generated by the touch, wherein the wireless keypad comprises a touch pad having a plurality of conductive patterns connected to the second electrode for detecting the touch, and wherein each of the plurality of conductive patterns is connected to one of a plurality of resistors each having a different length such that each of the plurality of conductive patterns has a different impedance value.