Method, system, and mobile communication terminal for performing specific function when mobile communication terminal is activated

1. A mobile communication terminal comprising:

a display unit; and

an activation button configured to switch from an inactive state, which is an OFF state of the display unit, to an active state, which is an ON state of the display unit; and

a user identification unit configured to operate a user identification function,

wherein the user identification function is performed simultaneously with switching from the inactive state of the display unit to the active state of the display unit by pressing the activation button,

wherein the user identification function includes a fingerprint recognition.

2. The mobile communication terminal according to claim 1 , wherein the activation button internally includes a sub-display unit.

3. The mobile communication terminal according to claim 1 , wherein the user identification function differs according to the number of presses or a press time of the activation button.

4. The mobile communication terminal according to claim 3 , further comprising a predetermined clock circuit or timer to measure a period of time for which the activation button is pressed for determining whether the activation button is pressed for a short time or a long time,

wherein the activation button is determined as being pressed for a long time when the period of time is equal or more than threshold time.

5. The mobile communication terminal according to claim 4 , wherein the user identification function is performed if the activation button is pressed for a long time.

6. The mobile communication terminal according to claim 3 , further comprising a predetermined clock circuit or timer to calculate the cumulative number of continuous presses of the activation button for determining whether the activation button is pressed once or multiple times,

wherein the number of presses is determined as being pressed multiple times when the activation button is re-pressed within a threshold time after a first press.

7. The mobile communication terminal according to claim 6 , wherein the user identification function is performed if the activation button is pressed multiple times.

8. The mobile communication terminal according to claim 1 , wherein, the fingerprint recognition is performed by comparing a fingerprint acquired by the activation button to pre-stored fingerprint information of a user.

9. A method of performing a user identification for a mobile communication terminal, the method comprising:

sensing whether or not an activation button has been pressed to switch from an inactive state, which is an OFF state of a display unit, to an active state, which is an ON state of the display unit; and

performing a user identification process by a fingerprint recognition simultaneously with switching from the inactive state of the display unit to the active state of the display unit if the pressing of the activation button is sensed.

10. The method of claim 9 , wherein the performing of the user identification process differs according to the number of presses or a press time of the activation button.

11. The method of claim 10 , further comprising measuring a period of time for which the activation button is pressed to determine whether the activation button is pressed for a short time or a long time,

wherein the activation button is determined as being pressed for the long time when the period of time is equal or longer than a threshold time, and the activation button is determined as being pressed for the short time when the period of time is shorter than the threshold time.

12. The method of claim 11 , wherein the performing of the user identification process is performed if the activation button is pressed for the long time.

13. The method of claim 10 , further comprising calculating the cumulative number of continuous presses of the activation button to determine whether the activation button is pressed once or multiple times,

wherein the number of presses is determined as being pressed multiple times when the activation button is re-pressed within a threshold time after a first press.

14. The method of claim 13 , wherein the performing of the user identification process is performed if the activation button is pressed multiple times.

15. The method of claim 9 , wherein the performing of the user identification process comprises comparing a fingerprint acquired by the activation button to pre-stored fingerprint information of a user.