Abstract:
A mobile terminal and method for supporting a lock function operation. The method for operation of a lock function in a mobile terminal includes: receiving an input event in a locked state; and performing an unlock operation by deactivating the lock function and applying tentative lock deactivation for a given time according to the received input event.

Description:
PRIORITY 
       [0001]    This application claims the benefit under 35 U.S.C. §119 (a) of a Korean patent application filed on Aug. 27, 2012 in the Korean Intellectual Property Office and assigned Serial No. 10-2012-0093924, the entire disclosure of which is hereby incorporated by reference. 
       TECHNICAL FIELD 
       [0002]    The present application relates to a lock function for a mobile terminal and, more particularly, to a mobile terminal and lock function operation method for the same that support extended user operability. 
       BACKGROUND 
       [0003]    Mobile terminals supporting communication have entered into widespread use due to small sizes thereof enabling ease of portability. Factors such as increased touchscreen sizes, advanced hardware and software support and diversification of digital content have dramatically accelerated popularization of mobile terminals. 
         [0004]    A mobile terminal may use a touch panel as an input device. When a touch event is generated by the touch panel, the mobile terminal performs a user function corresponding to the touch event. The touch panel cannot determine whether generation of a touch event is intended by the user or not. That is, a touch event that is not intended by the user may be generated according to placement of the mobile terminal or surroundings thereof. To address this problem, the mobile terminal supports a lock function so as to prevent unintended activation of the touch panel or user function. A lock screen is a representative example of such a lock function. The lock screen may correspond to a protective layer that prevents unintended activation of a menu icon, widget icon or user function presented on the touchscreen. 
         [0005]    An existing lock screen feature provides a lock screen and an unlock function for unlocking the lock screen with a valid unlock key. Such a lock screen feature tends to lock the mobile terminal in a rigid manner without regard to user intention, and the user is inconvenienced by having to repeatedly enter the unlock key. The user may not use a lock function to avoid such inconvenience. However, as not using a lock function may pose a security risk, the user may have to use such a lock function while enduring inconvenience. 
       SUMMARY 
       [0006]    The present disclosure provides a mobile terminal and method for operation of a lock function wherein the lock function can be executed adaptively according to user intention in such a way as to extend user operability. 
         [0007]    In accordance certain embodiments of the present disclosure, there is provided a method for operation of a lock function in a mobile terminal, including: receiving an input event in a locked state; and performing an unlock operation by deactivating the lock function and applying tentative lock deactivation for a given time according to the received input event. 
         [0008]    In accordance certain embodiments of the present disclosure, there is provided a mobile terminal supporting operation of a lock function, including: an input device configured to generate an input event to form a received input; and a control unit configured to control an operation to deactivate the lock function and apply tentative lock deactivation for a given time according to a received input event. 
         [0009]    Before undertaking the DETAILED DESCRIPTION OF THE INVENTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    The features and advantages of the present disclosure will be more apparent from the following detailed description in conjunction with the accompanying drawings, in which: 
           [0011]      FIG. 1  illustrates a block diagram of a mobile terminal supporting lock function operation according to embodiments of the present disclosure; 
           [0012]      FIG. 2  illustrates a configuration of a control unit in the mobile terminal of  FIG. 1 ; 
           [0013]      FIG. 3  illustrates a flowchart of a lock function operation method according to embodiments of the present disclosure; 
           [0014]      FIG. 4  illustrates a flowchart of a lock function operation method according to embodiments of the present disclosure; 
           [0015]      FIG. 5  illustrates screen representations for a first example of lock function operation according to embodiments of the present disclosure; 
           [0016]      FIG. 6  illustrates screen representations for a second example of lock function operation according to embodiments of the present disclosure; 
           [0017]      FIG. 7  illustrates screen representations for a third example of lock function operation according to embodiments of the present disclosure; and 
           [0018]      FIG. 8  illustrates screen representations for a fourth example of lock function operation according to embodiments of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0019]    Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. Detailed descriptions of well-known functions and structures incorporated herein may be omitted to avoid obscuring the subject matter of the present disclosure. Detailed descriptions of components having substantially the same configurations and functions may also be omitted. In the drawings, some elements are exaggerated, omitted or only outlined in brief, and thus may be not drawn to scale. Hence, the present disclosure is not limited by relative sizes of objects and intervals between objects in the drawings. 
         [0020]      FIG. 1  illustrates a block diagram of a mobile terminal  100  supporting lock function operation according to embodiments of the present disclosure. 
         [0021]    Referring to  FIG. 1 , the mobile terminal  100  may include a communication unit  110 , an input unit  120 , an audio processing unit  130 , a display unit  140 , a storage unit  150 , and a control unit  160 . Here, the input unit  120  and the display unit  140  may act as an input device for the mobile terminal  100 . 
         [0022]    The mobile terminal  100  having the above configuration provides a lock function, activation which may be delayed according to user lock and unlock settings. Hence, the user is not inconvenienced by unexpected or unintended locking of the mobile terminal  100  during use. As activation of the lock function is delayed for a preset time when the risk of unlocking is low, security of the mobile terminal  100  is not compromised. This tentative lock deactivation is adjustable by the user, increasing usability of the mobile terminal  100 . 
         [0023]    The communication unit  110  supports communication functions of the mobile terminal  100 , and may establish a communication channel to another mobile terminal or to a web server providing specific services through a communication network. When the mobile terminal  100  does not support communication, the communication unit  110  may be omitted. The communication unit  110  may include a mobile communication module to support mobile communication. The communication unit  110  may establish a communication channel for a voice call, a data call and a video call to a mobile communication system, and send and receive call signals through the communication channel. As call or message related functions supported by the communication unit  110  have priority over the lock function, they may be executed while the lock function is activated. For example, although the lock function is activated, a call connection request or a message may be received by the communication unit  110  and a notification may be output. 
         [0024]    The input unit  120  may generate various input signals needed for operation of the mobile terminal  100 . The input unit  120  may be composed of various input device such as a keyboard, keypad, and key button. The input unit  120  generating input signals may also be composed of a touch panel  143  and a touch map output on a display panel  141 . The input unit  120  may generate an input signal for activating the lock function and an input signal for deactivating the lock function. The input unit  120  may generate an input signal for setting a tentative deactivation time according to user control. 
         [0025]    The audio processing unit  130  may output various audio data generated in the course of using the mobile terminal  100 , output audio data generated by playback of audio files stored in the storage unit  150 , output audio data received from the outside, and collect audio data. To this end, the audio processing unit  130  may include a speaker SPK and a microphone MIC. In particular, the audio processing unit  130  outputs various sound effects in relation to usage of the lock function of the present disclosure. For example, the audio processing unit  130  may output a sound effect when lock settings are configured, the lock function is activated, or the lock function is deactivated. When a tentative lock deactivation time has been set or is set during an unlock process, the audio processing unit  130  may output a sound notification indicating the tentative lock deactivation time. Output of a sound effect or sound notification may be skipped according to user settings. 
         [0026]    The display unit  140  outputs various screens related to usage of the mobile terminal  100 , such as an idle screen and a menu screen. The display unit  140  may include a display panel  141  and a touch panel  143 . The touch panel  143  may be implemented using capacitance-based technology and generate a touch event corresponding to a change in capacitance caused by an object such as a finger. The touch panel  143  may also be implemented using electromagnetic induction technology and generate a touch event corresponding to a change in inductance caused by an object such as a touch pen. The display panel  141  may output various screens related to usage and user functions of the mobile terminal  100 . 
         [0027]    In particular, the di splay panel  141  may output various screens related to application of the lock function. For example, the display panel  141  may output a pattern screen having a variety of patterns constituting the lock screen and output a PIN entry screen. The user may enter an unlock key using the pattern screen or the PIN entry screen. Here, the user may enter a preset unlock pattern or a preset unlock code on the lock screen. The user may also generate a preset input signal. The user may generate one or more of an input signal for unlocking and an input signal for tentative lock deactivation through the display unit  140  acting as an input device. 
         [0028]    The storage unit  150  may store an operating system for operation of the mobile terminal  100  and store data, application programs and algorithms for realizing user functions. In particular, the storage unit  150  may store a locking program  151  supporting the lock function of the present disclosure, an unlock key  153  for unlocking, and a setting key  155  for tentative lock deactivation. 
         [0029]    The locking program  151  may include a variety of routines to support the lock function of the present disclosure. For example, the locking program  151  may include a routine for checking lock activation conditions, a routine for activating the lock function when a lock activation condition is satisfied, a routine for outputting a lock screen in response to an input event, and a routine for deactivating the lock function in response to a preset event. In particular, the locking program  151  may include a routine for deactivating the lock function in response to a preset input event and tentatively deactivating the lock function for a preset time, and a routine for deactivating the lock function in response to a preset input event and tentatively deactivating the lock function for a time indicated by the input event. The locking program  151  may include a routine for deactivating the lock function and a routine for deactivating the lock function and tentatively deactivating the lock function for a preset time, according to input event type. 
         [0030]    The unlock key  153  is information for unlocking. The unlock key  153  may be one or more of a PIN code and a pattern, which are set by the user in advance to deactivate the lock function. When the lock function is disabled, the unlock key  153  may be removed from the storage unit  150 . The unlock key  153  may be changed to a different pattern or number according to user control. 
         [0031]    The setting key  155  may be information for tentatively deactivating the lock function. For example, the setting key  155  may specify a tentative deactivation time. In this case, the user may adjust the time to deactivate the lock function by changing the setting key  155 . The setting key  155  may serve as an unlock key for tentatively deactivating the lock function. In this case, the setting key  155  may be a pattern or PIN code identical to or different from the unlock key  153 . The user may deactivate the lock function by generating an input event corresponding to the unlock key  153 , and may tentatively deactivate the lock function by generating an input event corresponding to the setting key  155 . The setting key  155  may serve as a variable key for setting a tentative deactivation time. In particular, the setting key  155  may correspond to a preset input event generated after entry of the unlock key  153 . Here, the tentative deactivation time for the lock function may be changed according to such an input event. 
         [0032]    The control unit  160  is configured to control signal flow and information collection and output operations necessary for realizing the lock function of the present disclosure. To this end, the control unit  160  may have a configuration as shown in  FIG. 2 . 
         [0033]      FIG. 2  illustrates a configuration of the control unit  160  in the mobile terminal  100 . 
         [0034]    Referring to  FIG. 2 , the control unit  160  may include a lock operation manager  161 , a timer  163 , and a function handler  165 . 
         [0035]    The lock operation manager  161  supports activation and deactivation of the lock function of the present disclosure. In particular, the lock operation manager  161  may tentatively deactivate the lock function according to the setting key  155 , so that the mobile terminal  100  may be normally used. Specifically, the lock operation manager  161  may configure settings so that the lock function is activated according to preset locking conditions. Here, the locking conditions may include initial input after the mobile terminal  100  is powered on, no input for a preset time or more, and generation of an input signal requesting lock activation. When at least one locking condition is satisfied, the lock operation manager  161  may force the mobile terminal  100  to transition to the locked state. Thereafter, when an input event for unlocking is generated from the input unit  120 , the lock operation manager  161  may control the display unit  140  to display a preset lock screen. Here, the lock screen is a screen selected by the user or provided by default for unlocking. The lock screen may take different forms according to user-defined attributes of the lock function. For example, when the user has selected a pattern for locking and unlocking operation, the lock screen may provide a means to enter a specific pattern. When the user has selected a PIN code for locking and unlocking operation, the lock screen may provide a means to enter a specific PIN code. 
         [0036]    When an input event is received from the display unit  140  or input unit  120  after output of the lock screen, the lock operation manager  161  may check whether the received input event corresponds to the unlock key  153 . To this end, the lock operation manager  161  may compare the received input event with the unlock key  153  stored in the storage unit  150 . When the received input event matches the unlock key  153 , the lock operation manager  161  may deactivate the lock function, remove the lock screen from the display unit  140 , and control the display unit  140  to output a preset screen such as a menu screen according to scheduling information or output a user application screen having been active immediately before activation of the lock function. 
         [0037]    On the other hand, when an input event matches the setting key  155 , the lock operation manager  161  may tentatively deactivate the lock function. Here, tentative deactivation may be realized in various ways according to design of the setting key  155 . For example, when the setting key  155  is preset information for tentative lock deactivation, the lock operation manager  161  may control the display unit  140  to output a pattern entry screen or PIN entry screen for unlocking. When a received input event matches the setting key  155 , the lock operation manager  161  may apply tentative lock deactivation. In this process, the lock operation manager  161  starts the timer  163  and tentatively deactivates the lock function until the timer  163  expires. Upon expiration of the timer  163 , the lock operation manager  161  may cancel tentative lock deactivation and activate the lock function according to preset conditions. 
         [0038]    When the setting key  155  is set so as to apply tentative lock deactivation for a time indicated by an input event, the lock operation manager  161  may apply tentative lock deactivation for a time indicated by an input signal generated from the input unit  120  or display unit  140 . Here, the lock operation manager  161  may adjust the tentative deactivation time according to a received input event. That is, the lock operation manager  161  may change the time value of the timer  163  according to an input event. 
         [0039]    The lock operation manager  161  may use the unlock key  153  and the setting key  155  in sequence for operation control. That is, when an input event for unlocking is generated during activation of the lock function, the lock operation manager  161  may use the input event to perform unlocking operation and use the next input event to set a tentative lock deactivation time. For example, to unlock using a pattern, the user may perform a sequence of drag gestures to enter a specific pattern and perform another drag gesture. Then, the lock operation manager  161  may deactivate the lock function and remove the lock screen from the display unit  140  according to the result of matching of the drag gestures with the unlock key  153  and apply tentative lock deactivation for a time indicated by the next drag gesture. To this end, the lock operation manager  161  may track a touch event such as drag in real time and assign a time value to a particular touch event in advance. 
         [0040]    In addition, the lock operation manager  161  may support power saving mode operation. For example, when no input event is generated for a preset time, the lock operation manager  161  may force the mobile terminal  100  to enter a dimming mode, during which supply of power to the display unit  140  is minimized. When no input event is generated for a preset time in the dimming mode, the lock operation manager  161  may force the mobile terminal  100  to enter a turn-off mode, during which supply of power to the display unit  140  is blocked. Here, unlike a related art technique, while tentative lock deactivation is being applied, the lock operation manager  161  may sustain the lock function in a deactivated state even when the display unit  140  is turned off. When an input signal for use of the mobile terminal  100  is generated within the tentative lock deactivation time, the lock operation manager  161  may resume supply of power to the display unit  140  without output of the lock screen. 
         [0041]    The timer  163  is started for tentative lock deactivation under control of the lock operation manager  161 . When the time set by default or an input event expires, the timer  163  stops and may send an expiration event to the lock operation manager  161 . The time value of the timer  163  may be pre-specified by the user for tentative lock deactivation. For example, the user may set the time value to one hour, two hours, or three hours. The user may set the time value to one hour, one hour and thirty minutes, one hour and forty-five minutes or the like through input of the setting key  155 . The timer  163  may be forcibly stopped according to user request and tentative lock deactivation may be cancelled accordingly. The time value of the timer  163  may be increased according to user request. After the time of the timer  163  is set to one hour, when the timer  163  has 10 minutes left after running 50 minutes, the user may generate an input event to reset the time of the timer  163  to one hour or to add 30 minutes to the remaining time. 
         [0042]    The function handler  165  is configured to execute a user function supported by the mobile terminal  100  according to user manipulation, preset scheduling information or external input and output data produced by the user function. When the lock function is activated, the function handler  165  may control an operation to temporarily suspend or continue execution of an activated user function according to the type of the user function. For example, the function handler  165  may place the call handling function in a ready state even when the lock function is activated, activate the call handling function to generate a ringtone when a call connection request is received from the outside, and control an operation to establish a call connection during lock activation when an input signal accepting the call connection request is entered. When the call handling function is executed to place a call, the function handler  165  may deactivate the lock function. When the lock function is activated in a state in which a web connection is established through the communication unit  110 , the function handler  165  may discontinue the web connection to release allocated radio resources. That is, the function handler  165  may control the communication unit  110  to release the web connection. Thereafter, when an input signal for unlocking is generated, the function handler  165  may re-establish a connection to the previous website on the basis of web log information. 
         [0043]    As described above, application of tentative lock deactivation may deactivate the lock function for a preset time according to user settings or user request. Hence, the user need not perform an unnecessary unlock operation. In addition, the lock function is deactivated for a given time. In the case that the mobile terminal  100  is lost or remains at a specific position for a long time, the lock function is automatically activated, contributing to information security. 
         [0044]      FIG. 3  illustrates a flowchart of a lock function operation method according to embodiments of the present disclosure. 
         [0045]    Referring to  FIG. 3 , in the lock function operation method, the control unit  160  of the mobile terminal  100  outputs a lock screen on the display unit  140  and remains in a wait state ( 301 ). That is, the user may configure settings for lock activation in advance. Thereafter, the user may turn on the mobile terminal  100  or manipulate the mobile terminal  100  so that a locking condition is satisfied. While the lock function is activated, the user may manipulate the mobile terminal  100 . For example, the user may press a “home” key or “power” key of the mobile terminal  100 . 
         [0046]    The lock screen output on the display unit  140  at step  301  may be a lock screen having a preset pattern or a PIN entry region. Hence, the user may enter a specific pattern or a PIN code through the lock screen. The control unit  160  checks whether the input information matches the preset unlock key  153  ( 303 ). Here, the unlock key  153  may be a preset pattern or PIN code. When the input information does not match the preset unlock key  153 , the control unit  160  returns to step  301 . 
         [0047]    When the input information matches the preset unlock key  153 , the control unit  160  checks whether a setting value for tentative lock deactivation is input ( 305 ). Here, the control unit  160  may control the display unit  140  to output a screen for setting tentative lock deactivation. For example, the control unit  160  may display a lock screen having a value entry region on the display unit  140 . When an input value does not match the preset setting key  155 , the control unit  160  may deactivate the lock function and perform a requested operation ( 307 ). That is, the control unit  160  does not apply tentative lock deactivation and may perform an operation according to user manipulation. For example, the control unit  160  may perform an operation such as file playback, file search, call handling, web access, broadcast reception, or camera manipulation according to user control or preset scheduling information. 
         [0048]    When an input value matches the preset setting key  155 , the control unit  160  starts the timer  163 , applies tentative lock deactivation, and performs an operation according to user control or preset scheduling information ( 309 ). Here, the control unit  160  may apply tentative lock deactivation in different ways according to properties of the setting key  155 . For example, in the case that the setting key  155  has a property similar to the unlock key  153  (the setting key  155  is used for tentative lock deactivation), when input information matches the setting key  155 , the control unit  160  may apply tentative lock deactivation for a preset time. While tentative lock deactivation is applied, although the power saving mode is entered, the control unit  160  may not display a lock screen for locking. 
         [0049]    In the case that the setting key  155  is used not only for tentative lock deactivation but also as a time value specifying a duration in which tentative lock deactivation is effective, the control unit  160  may apply tentative lock deactivation according to input information. For example, when no input is received after the input signal matching the unlock key  153  is received, the control unit  160  may proceed to step  307  (tentative lock deactivation is not applied). When a new input signal is received after the input signal matching the unlock key  153  is received, the control unit  160  may apply tentative lock deactivation for a time indicated by the new input signal. For example, when the user enters a PIN code matching the unlock key  153  and enters a value ‘2’ in sequence, the control unit  160  may regard the input value ‘2’ as an input signal for tentative lock deactivation and as a time value (two hours) for the timer  163 . That is, tentative lock deactivation will be applied for two hours. 
         [0050]    The control unit  160  checks whether the timer  163  has expired ( 311 ). When the timer  163  has not expired, the control unit  160  returns to step  309  and performs a requested operation while tentative lock deactivation is being applied. When the timer  163  has expired, the control unit  160  checks whether a locking condition is satisfied ( 313 ). When no locking condition is satisfied, the control unit  160  proceeds to step  307 , and may perform a requested operation and monitor the locking conditions. Here, a locking condition may correspond to absence of input for a preset time or more, or to generation of an input signal requesting lock activation. When a locking condition is satisfied, the control unit  160  activates the lock function and returns to step  301 . 
         [0051]      FIG. 4  illustrates a flowchart of a lock function operation method according to embodiments of the present disclosure. 
         [0052]    Referring to  FIG. 4 , in the lock function operation method, the control unit  160  of the mobile terminal  100  outputs a lock screen on the display unit  140  and remains in a wait state ( 401 ). Here, the lock screen enables entry of unlock information. 
         [0053]    The control unit  160  receives input information through the input unit  120  or display unit  140  and checks the input information ( 403 ). When the input information does not match the unlock key  153  or setting key  155  (erroneous case), the control unit  160  returns to step  401 . When the input information matches the preset unlock key  153 , the control unit  160  may deactivate the lock function and perform an operation according to user control or preset scheduling information ( 405 ). 
         [0054]    When the input information matches the preset setting key  155 , the control unit  160  starts the timer  163 , applies tentative lock deactivation, and performs an operation according to user control or preset scheduling information ( 407 ). 
         [0055]    The control unit  160  checks whether the timer  163  has expired ( 409 ). When the timer  163  has not expired, the control unit  160  returns to step  407  and performs a requested operation while tentative lock deactivation is being applied. When the timer  163  has expired, the control unit  160  checks whether a locking condition is satisfied ( 411 ). When no locking condition is satisfied, the control unit  160  proceeds to step  405 , and may perform a requested operation and monitor satisfaction of a locking condition. When a locking condition is satisfied, the control unit  160  activates the lock function and returns to step  401 . 
         [0056]    As described above, when a lock screen is output on the display unit  140 , the mobile terminal  100  may perform unlocking or may perform unlocking and apply tentative lock deactivation according to input information. To this end, the user may configure settings for the unlock key  153  (for unlocking) and the setting key  155  (for unlocking, tentative lock deactivation and deactivation time). 
         [0057]      FIG. 5  illustrates screen representations for a first example of lock function operation according to embodiments of the present disclosure. 
         [0058]    Referring to  FIG. 5 , to manipulate the mobile terminal  100  whose lock function is activated, the user may generate an input signal by entering, for example, a “home” key. Then, the control unit  160  may control the display unit  140  to output a lock screen indicating lock activation as indicated by reference numeral  501 . Here, the lock screen may include a pattern according to user lock settings. For entry of a specific pattern, the lock screen is depicted as having nine points as a pattern. However, the present disclosure is not limited thereto. The display unit  140  may output a lock screen with a variety of patterns according to user selection. 
         [0059]    The user may generate an input signal matching the preset unlock key  153  through the input unit  120  or display unit  140  as indicated by reference numeral  503 . When the input information matches the unlock key  153 , the control unit  160  may deactivate the lock function and output a lock screen having a pattern for tentative lock deactivation as indicated by reference numeral  505 . That is, the lock screen having the pattern indicated by reference numeral  505  serves to determine whether to apply tentative lock deactivation. When the user enters a pattern not matching the preset setting key  155  as indicated by reference numeral  507 , the control unit  160  does not apply tentative lock deactivation and may perform a user requested operation with the lock deactivated as indicated by reference numeral  509 . 
         [0060]    In a state indicated by reference numeral  505 , when the user enters a pattern matching the preset setting key  155  as indicated by reference numeral  511 , the control unit  160  may apply tentative lock deactivation as indicated by reference numeral  513 . Here, to indicate application of tentative lock deactivation, one or more of an unlock indicator  40  and an unlock icon  50  may be output on the display unit  140 . The unlock icon  50  may have a different shape or image according to the tentative lock deactivation time. The user may check the unlock icon  50  to identify a duration of tentative lock deactivation. 
         [0061]    In addition, the user may select the unlock icon  50  to increase the tentative lock deactivation time or to cancel tentative lock deactivation. To this end, the control unit  160  may output a screen enabling adjustment of the tentative lock deactivation time on the display unit  140 . 
         [0062]    In  FIG. 5 , the unlock key  153  and the setting key  155  have been described as having the same pattern. However, the present disclosure is not limited thereto. That is, the unlock key  153  and the setting key  155  may have the same pattern or different patterns according to user settings. The screen indicated by reference numeral  505  may be a screen enabling entry of a number specifying a tentative deactivation time. 
         [0063]      FIG. 6  illustrates screen representations for a second example of lock function operation according to embodiments of the present disclosure. 
         [0064]    Referring to  FIG. 6 , the control unit  160  of the mobile terminal  100  may control the display unit  140  to output a lock screen as indicated by reference numeral  601  (similar to the state indicated by reference numeral  501 ). When the user enters input information, the control unit  160  may perform different operations according to the input information. That is, when a pattern entered by the user matches the unlock key  153  as indicated by reference numeral  603 , the control unit  160  may deactivate the lock function. As indicated by reference numeral  605 , the control unit  160  may control the display unit  140  to output a screen as a result of deactivation of the lock function. Here, the screen indicated by reference numeral  605  may be a screen associated with an application executed before activation of the lock function. 
         [0065]    When a pattern entered by the user matches the setting key  155  as indicated by reference numeral  607 , the control unit  160  may deactivate the lock function and apply tentative lock deactivation. As indicated by reference numeral  609 , the control unit  160  may output a screen on the display unit  140  as a result of deactivation of the lock function and present an indication to application of tentative lock deactivation. One or more of an unlock indicator  40  and an unlock icon  50  may be output on the display unit  140 . Here, to indicate application of tentative lock deactivation, the display unit  140  is described as outputting the unlock indicator  40  and the unlock icon  50 . However, the present disclosure is not limited thereto. That is, when input information entered by the user matches the setting key  155 , the control unit  160  may output a notification or popup window indicating application of tentative lock deactivation for a pre set time. Here, the tentative deactivation time may also be output for a preset time. 
         [0066]      FIG. 7  illustrates screen representations for a third example of lock function operation according to embodiments of the present disclosure. 
         [0067]    Referring to  FIG. 7 , with activation of the lock function, the control unit  160  may output a lock screen having a pattern on the display unit  140  as indicated by reference numeral  701 . Here, the display unit  140  displays a lock screen having nine points as a pattern. 
         [0068]    The user may enter a pattern matching the preset unlock key  153  as indicated by reference numeral  703 . Specifically, the user may enter a specific pattern by making a drag gesture involving first point (upper left), second point (upper center), third point (center), fourth point (lower center) and fifth point (lower right) in sequence. The touch panel  143  generates a drag event involving first to fifth points and sends the drag event to the control unit  160 . Upon reception of the drag event, the control unit  160  checks whether the drag event matches the unlock key  153 . When the drag event matches the unlock key  153 , the control unit  160  may control an operation to deactivate the lock function (unlock). Here, the control unit  160  may check occurrence of an end-of-drag event (i.e. touch release). When an end-of-drag event occurs, the control unit  160  may regard this as completion of the drag gesture and perform the unlock operation. 
         [0069]    In a state indicated by reference numeral  703 , the user may make an additional touch gesture. For example, the user may enter a drag gesture involving fifth point, fourth point and third point in sequence as indicated by reference numeral  705 . In the case that an additional touch event occurs continuously or discontinuously after occurrence of a touch event matching the unlock key  153 , the control unit  160  may regard the additional touch event as an input signal corresponding to the setting key  155 . When one point corresponds to one hour, the control unit  160  may set the tentative lock deactivation time to two hours according to the additional touch event involving two points (fourth point and third point). Here, the time per point may be set by the user or preset by the developer. 
         [0070]    The user may generate a touch event by making a touch gesture involving touch-down, drag and touch-release. For example, as indicated by reference numeral  705 , the user may generate a touch event by making a drag gesture from first point to fifth point and back from fifth point to third point as a single action. Then, the control unit  160  checks whether the touch event carries touch information matching the unlock key  153  and additional touch information. When the touch event carries touch information matching the unlock key  153 , the control unit  160  may deactivate the lock function. When the touch event carries both touch information matching the unlock key  153  and additional touch information, the control unit  160  may deactivate the lock function, apply tentative lock deactivation, and run the timer  163  for a time corresponding to the additional touch information. 
         [0071]      FIG. 8  illustrates screen representations for a fourth example of lock function operation according to embodiments of the present disclosure. 
         [0072]    Referring to  FIG. 8 , with activation of the lock function, the control unit  160  may output a lock screen enabling PIN code entry on the display unit  140  as indicated by reference numeral  801 . Here, the lock screen is depicted as including a number output region  810  accommodating 8 digits and a number entry region  820 . However, the present disclosure is not limited thereto. That is, the number output region  810  may be set to accommodate more than 8 digits with or without separation between digits according to user settings. 
         [0073]    The user may enter a PIN code using the number entry region  820  and the control unit  160  may display the PIN code in the number output region  810  as indicated by reference numeral  803 . Here, the control unit  160  may replace the entered number with special characters for security purposes. When a PIN code is entered, the control unit  160  may check whether the input PIN code matches the preset unlock key  153 . For example, when “2759” is entered as a PIN code, the control unit  160  may check whether “2759” matches the unlock key  153 . In particular, when the user enters the ‘OK’ or ‘enter’ key to finish key entry after inputting a PIN code (e.g. “2759”) matching the unlock key  153 , the control unit  160  may deactivate the lock function (unlocking) as indicated by reference numeral  805 . Here, the control unit  160  may control the display unit  140  to output a screen according to preset scheduling information or a screen associated with an application executed before activation of the lock function. 
         [0074]    As indicated by reference numeral  807 , the user may enter a number in addition to the PIN code. For example, the user may enter “0090” in addition to “2759”. When the user enters the ‘enter’ key or the like to complete key entry, the control unit  160  may check whether the input information contains data matching the unlock key  153  and additional data. When additional data is present, the control unit  160  may regard the additional data as a signal for tentative lock deactivation. Hence, the control unit  160  may deactivate the lock function and notify the user of application of tentative lock deactivation as indicated by reference numeral  809 . Here, to notify application of tentative lock deactivation, the control unit  160  outputs an unlock indicator  40  and an unlock icon  50  on the display unit  140 . Alternatively, as described before, the control unit  160  may output a notification or popup window indicating application of tentative lock deactivation for a preset time. 
         [0075]    As described above, the mobile terminal supporting lock function operation of the present disclosure may apply tentative lock deactivation so as to deactivate a process realizing the lock function for a time given by default or set by the user. Hence, embodiments of the present disclosure may alleviate user inconvenience due to repeated unlocking and sustain security by activating the lock function after a given time. This improves user operability with regard to the lock function. In addition, the mobile terminal may provide a separate menu for setting options for tentative lock deactivation, so that tentative lock deactivation may be applied according to user settings without regard to the time of unlocking. To this end, the mobile terminal may provide a menu having options for selecting the tentative deactivation time such as one hour, two hours or user specified time, tentatively deactivate the lock function according to user selection, and activate the lock function after expiration of the timer to perform normal locking operation. Hence, the user may tentatively deactivate the lock function through menu selection if needed during usage of the mobile terminal. 
         [0076]    If necessary, the mobile terminal  100  may further include various components. That is, the mobile terminal  100  serving as a communication device may further include a local-area communication module for local area communication, a data communication interface based on wired and wireless communication, an Internet communication module for Internet access, and a digital broadcast reception module for playing digital broadcasts. With the digital convergence trend, it should be apparent to those skilled in the art that the mobile terminal  100  may further include a unit comparable to the above-described units, and one unit of the mobile terminal  100  may be removed or replaced with another unit. 
         [0077]    The mobile terminal  100  of the present disclosure may be any information and communication appliance or multimedia appliance, such as a mobile communication terminal based on communication protocols supporting various communication systems, a portable multimedia player (PMP), a digital broadcast receiver, a personal digital assistant (PDA), a music player like an MP3 player, a portable game console, a smartphone, a laptop computer, or a handheld computer. 
         [0078]    In a feature of the present disclosure, the lock function operation method enables the mobile terminal to delay or adjust the point in time at which the lock function is activated according to user settings without increased security risk. Hence, the user may operate the mobile terminal in a more convenient manner without repeated lock manipulation. 
         [0079]    Hereinabove, exemplary embodiments of the present disclosure have been described with reference to the accompanying drawings. Specific terms or words used in the description should be construed in accordance with the spirit of the present disclosure without limiting the subject matter thereof. It should be understood that many variations and modifications of the basic inventive concept described herein will still fall within the spirit and scope of the present disclosure as defined in the appended claims.