Gesture based unlocking of a mobile terminal

A method of controlling a mobile terminal with a touch screen, the method comprising:

• displaying a uniform image of a first enclosure and an unlock image of a second enclosure bounded by the uniform image of the first enclosure on the touch screen in response to detection of a contact on the touch screen while the mobile terminal is in a lock state;
• enlarging the unlock image of the second enclosure in accordance with movement of the contact away from an initial position of the contact while the contact on the touch screen is maintained throughout the movement;
• and
• unlocking the mobile terminal in response to a release of the contact when the unlock image of the second enclosure is enlarged to reach or exceed a boundary of the uniform image of the first enclosure.

A computer-readable medium storing instructions that, when executed by a computer comprising a touch screen, cause the computer to:

• display a uniform image of a first enclosure and an unlock image of a second enclosure bounded by the uniform image of the first enclosure on the touch screen in response to detection of a contact on the touch screen while the computer is in a lock state;
• enlarge the unlock image of the second enclosure in accordance with movement of the contact away from an initial position of the contact while the contact on the touch screen is maintained throughout the movement;
• and
• unlock the computer in response to a release of the contact when the unlock image of the second enclosure is enlarged to reach or exceeds a boundary of the uniform image of the first enclosure.