Patent ID: 8195252

Claim:
An input device for a mobile terminal, the input device comprising: a rotatable scroll key providing rotational information based on movement of the scroll key; a sensing device for sensing a position of a user's finger on the scroll key along a longitudinal direction of a rotational axis of the scroll key and providing sensing information based on the sensed position of the user's finger along the longitudinal direction of the rotational axis of the scroll key; and a controller for receiving the rotational information and sensing information, and controlling the mobile terminal based on the received rotational information and sensing information, wherein the sensing device comprises at least one sensing unit sending a signal to the controller when the user's finger is located at a predetermined position of the scroll key, wherein the controller moves a display cursor or output screen of the mobile terminal in one of a first direction, and a second direction opposite to the first direction, according to a rotational direction of the scroll key, when the controller receives the rotational information but not the sensing information, and wherein the controller moves the display cursor or output screen of the mobile terminal in a direction different from the first and second directions according to the rotational direction of the scroll key, when the sensing device senses the user's finger at the predetermined position of the scroll key while the scroll key is rotated, and the controller receives the rotational information and the sensing information.