Patent Publication Number: US-10318222-B2

Title: Apparatus and method for screen display control in electronic device

Description:
PRIORITY 
     This application claims priority under 35 U.S.C. § 119(a) to a Korean Patent Application filed in the Korean Intellectual Property Office on Nov. 18, 2014 and assigned Serial No. 10-2014-0161107, the entire disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     1) Field of the Disclosure 
     The present disclosure relates to an apparatus and method for controlling a display of a screen in an environment that supports multitasking. 
     2) Description of the Related Art 
     Due to the growth of various technologies, a variety of electronic devices have become increasingly popular these days while their functionality has expanded for the user. For example, a smart phone now performs various functions, such as gaming, multimedia, camera, Internet access, scheduling, messaging, navigation, and the like, as well as voice call functionality. Normally, a smart phone may have a touch screen. Using this touch screen, a smart phone detects a user input and visually displays a screen in response to the user input. 
     In order to meet users&#39; diversified demands, a multitasking function for simultaneously operating a plurality of applications is frequently used. An electronic device that supports a multitasking function may display running applications on a single screen. When two or more applications are executed in a multitasking environment, an electronic device may display respective application execution screens on a split screen. For example, one application execution screen may be displayed on an upper part of the split screen, and the other may be displayed on a lower part of the split screen. 
     When a user who has a large-sized electronic device holds the electronic device with one hand, the user may often have difficulty in manipulating an application displayed on the upper part of the split screen by using his or her thumb only. Certain applications displayed out of reach from the thumb may be not easy to manipulate. Further, when any event for executing a new application occurs, the use of running applications may be limited. 
     SUMMARY 
     Accordingly, an aspect of the present disclosure provides an apparatus and method for controlling a screen display so that an application execution screen displayed on a relatively distant first area can be displayed on a relatively near second area when it is required to manipulate the application execution screen on the first area. 
     According to an aspect of the present disclosure, an apparatus and method for controlling a screen display so that an item for controlling an application execution screen displayed on the first area can be displayed on the second area which allows one-handed manipulation of the user interface. 
     According to an aspect of the present disclosure, an apparatus for controlling a screen display in an electronic device includes a display panel configured to display respective application execution screens on first and second areas of a screen wherein the first and second areas are distinct from each other; and a control unit configured to control the display panel to display a second application execution screen on the first area and to display a third application execution screen on the second area when an event for executing a third application is detected while a first application execution screen is displayed on the first area and the second application execution screen is displayed on the second area, and configured to control the display panel to display the first application execution screen on the first area and to display the second application execution screen on the second area when execution of the third application is terminated. 
     According to an aspect of the present disclosure, a method for controlling a screen display in an electronic device includes operations of displaying first and second application execution screens on first and second areas of a screen, respectively, wherein the first and second areas are distinct from each other; detecting an event for executing a third application; displaying the second application execution screen on the first area and also displaying a third application execution screen on the second area in response to the detected event; and displaying the first application execution screen on the first area and also displaying the second application execution screen on the second area when execution of the third application is terminated. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a diagram illustrating a split screen of an electronic device according to an embodiment of the present disclosure; 
         FIG. 2  is a block diagram illustrating major elements of an electronic device according to an embodiment of the present disclosure; 
         FIG. 3  is a flowchart illustrating a process of controlling a display of application execution screens according to an embodiment of the present disclosure; 
         FIG. 4  shows display screenshots illustrating a process of controlling a display of application execution screens according to an embodiment of the present disclosure; 
         FIG. 5  is a flowchart illustrating a process of controlling a display of application execution screens according to another embodiment of the present disclosure; 
         FIGS. 6 to 9  show display screenshots illustrating a process of controlling a display of application execution screens according to embodiments of the present disclosure; and 
         FIG. 10  is a flowchart illustrating a process of controlling a display of application execution screens according to another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, various embodiments will be described with reference to the accompanying drawings. This disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, the disclosed embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The principles and features of this invention may be employed in varied and numerous embodiments without departing from the scope of the invention. 
     Furthermore, well known or widely used techniques, elements, structures, and processes may not be described or illustrated in detail to avoid obscuring the essence of the present disclosure. Although the drawings represent particular embodiments, the drawings are not necessarily to scale and certain features may be exaggerated or omitted in order to better illustrate and explain the present disclosure. Throughout the drawings, the same or similar reference numerals denote corresponding features consistently. 
     Unless defined differently, all terms used herein, which include technical terminologies or scientific terminologies, have the same meaning as that understood by a person skilled in the art to which the present invention belongs. Singular forms are intended to include plural forms unless the context clearly indicates otherwise. 
     The terms such as “comprise”, “include”, and/or “have” may be construed to denote a certain characteristic, number, step, operation, constituent element, component or a combination thereof, but are not to be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof. The expression “or” includes any and all combinations of the associated listed words. For example, the expression “A or B” may include A, may include B, or may include both A and B. 
     In various embodiments disclosed herein, expressions including ordinal numbers, such as “first” and “second,” etc., may modify various elements. However, such elements are not limited by the above expressions. For example, the above expressions do not limit the sequence and/or importance of the elements. The above expressions are used merely for the purpose to distinguish an element from the other elements. For example, a first user device and a second user device indicate different user devices although both of them, the first user device and the second user device, are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be also referred to as a first element without departing from the scope of the present disclosure. 
       FIG. 1  is a diagram illustrating a split screen of an electronic device according to an embodiment of the present disclosure. 
     Referring to  FIG. 1 , the electronic device  100  that supports a multitasking environment may logically divide the entire area of a touch screen  130  into two or more areas. For example, the electronic device  100  may divide the area of the touch screen  130  lengthwise or widthwise, and the dividing of the screen may be adjusted when the orientation of the electronic device  100  is rotated 90°. 
     In an embodiment of the present disclosure, the electronic device  100  may display the first application execution screen on the first area  130   a  located at an upper part of the logically divided screen  130 , and also display the second application execution screen on the second area  130   b  located at a lower part of the logically divided screen  130 . Of course, the reverse is also possible. 
     In another embodiment of the present disclosure, the electronic device  100  may display the first application execution screen on the first area located at a left part of the logically divided screen  130 , and also display the second application execution screen on the second area located at a right part of the logically divided screen  130 . Of course, in this case as well, the reverse is also possible. 
     Hereinafter, it will be defined that ‘the first area’ refers to a region located at the upper part of the logically divided screen and also ‘the second area’ refers to a region located at the lower part of the logically divided screen. The first and second areas are distinct from each other, and the dimensions thereof are not fixed. This definition is an example only and not to be considered as a limitation of the present disclosure. For example, although the second area  130   b  is shown as being greater than the first area  130   a , this is merely an example. Alternatively, the second area  130   b  may be smaller than or of the same size as the first area  130   a.    
     An application displayed on the first area  130   a  may be one of a specific application selected by a user, a predefined default application (e.g., defined at manufacture), a recently executed application, or a frequently executed application, and may be displayed in the form of a widget, a shortcut, an icon, or the like. If multiple applications are displayed on the first area  130   a , each individual application execution screen may be displayed one by one in response to a user input (e.g., a drag) in a widthwise or lengthwise direction. The same may be applied to the second area  130   b.    
     The first and second areas  130   a  and  130   b  may be formed by different touch screens which are physically distinct from each other. Namely, two touch screens may be logically unified and respectively form the first and second areas  130   a  and  130   b . Although embodiments disclosed herein employ a split screen in which a physically single touch screen is logically divided into two screen areas, this is merely a particular embodiment and is not to be considered a limitation. 
     The electronic device  100  may activate or deactivate a screen split function for displaying respective application execution screens on logically divided areas of the screen in a multitasking environment. In response to a user&#39;s request, the electronic device  100  may turn on or off the screen split function. 
     In an embodiment of the present disclosure, if the screen split function is activated, the electronic device  100  may display the first application execution screen on the first area and also display the second application execution screen on the second area. Subsequently, if an event for executing the third application occurs, the electronic device  100  may display the second application execution screen on the first area and also display the third application execution screen on the second area. In this case, the attribute of the third application may be set to display an application execution screen on the second area. This attribute of the third application may be set by a user. Additionally or alternatively, such an attribute may be set by a developer during the development of an application or by a manufacturer during the manufacture of the electronic device. 
     In an embodiment of the present disclosure, the attribute of the third application may be set differently according to application types by, e.g., a user. For example, the attribute of a call application may be set to display a call application execution screen on the second area. Also, the attribute of a music application may be set to display at least one item for controlling the music application on the second area. In such cases, if an event for executing the third application occurs, the electronic device may determine whether to display the third application execution screen on the second area or to display the control item for the third application on the second area, depending on application types, i.e., based on the attribute of the third application. 
     In another embodiment of the present disclosure, the attribute of the third application may be set equally regardless of application types by, e.g., a user. For example, all attributes of a call application and a music application may be set to display a corresponding application execution screen on the second area or to display at least one item for controlling a corresponding application on the second area. 
     The electronic device  100  may display application execution screens on the first and second areas  130   a  and  130   b  at the same layer. 
     In another embodiment of the present disclosure, if the screen split function is activated, the electronic device  100  may display the first application execution screen on the first area and also display the second application execution screen on the second area. Then, if an event for executing the third application occurs, the electronic device  100  may display the third application execution screen on the first area while maintaining a display of the second application execution screen on the second area. Further, the electronic device  100  may display at least one item for controlling the third application on the second area. In this case, the attribute of the third application may be set to display a control item on the second area. The at least one item for controlling the third application may be displayed, for example, in the form of a button at an upper layer on a currently displayed application execution screen. 
     In case different application execution screens are displayed respectively on the first and second areas  130   a  and  130   b  of the touch screen  130 , the electronic device  100  may control each individual application to be executed independently. In response to a user input on each of the first and second areas  130   a  and  130   b , the electronic device  100  may display a corresponding application execution screen on a corresponding area. In some cases, applications executed on the first and second areas  130   a  and  130   b  may be controlled in conjunction with each other. 
     In an embodiment of the present disclosure, a message application may be executed on the first area  130   a , and a gallery application may be executed on the second area  130   b . In this case, the electronic device  100  may support a function to attach a photo arranged in a gallery application execution screen to a message displayed in a message application execution screen. 
     In another embodiment of the present disclosure, while different application execution screens are displayed on the first and second areas  130   a  and  130   b , the electronic device  100  may receive a user input for maximizing an application execution screen displayed on the first or second screen  130   a  or  130   b . For example, the first area  130   a  may contain a maximization button  102  displayed thereon, and a user may select this button  102  to maximize the application execution screen displayed on the first screen  130   a . In response to this input, the electronic device  100  may display this application execution screen on a full screen  101 . 
     If the screen split function is deactivated, the electronic device  100  may display a selected application execution screen on the full screen  101  of the touch screen  130 . 
       FIG. 2  is a block diagram illustrating major elements of an electronic device according to an embodiment of the present disclosure. 
     Referring to  FIG. 2 , the electronic device  100  may include a wireless communication unit  110 , a memory unit  120 , a touch screen  130 , and a control unit  140 . 
     The wireless communication unit  110  may include one or more modules for performing wireless communication between the electronic device  100  and a wireless communication system or network having other electronic devices. For example, the wireless communication unit  110  may include a mobile communication module, a wireless local area network (WLAN) module, various types of short range communication modules, a location computation module, a broadcast receiving module, and the like. 
     The wireless communication unit  110  may receive an incoming call or message while respective applications are executed on the first and second areas. In an embodiment of the present disclosure, the reception of a call or message may be considered an event for executing the third application. 
     The memory unit  120  may store programs and applications required for the electronic device  100  or selected by a user. Further, the memory unit  120  may store various types of data created during the operation of the electronic device  100  or received from any external entity through the wireless communication unit  110 . 
     In an embodiment of the present disclosure, the memory unit  120  may store setting information about whether to use a screen split function, information about applications to be disposed on the first area, attribute information about applications, and the like. Specifically, the setting information about whether to use a screen split function may be certain information which is set by a user to respectively display two or more application execution screens on logically divided screen areas in a multitasking environment. The information about applications to be disposed on the first area may be certain information about an application to be displayed on the first application execution screen when the screen split function is activated. This information may be set by a user. For example, the information about applications to be disposed on the first area may be in the form of a widget, an application, a gadget, and the like, and may be set by a user. The attribute information about applications may be set during development of the application, during manufacture of the electronic device, as one of user defined settings, or the like. This application attribute information may be information indicating a display location of an application execution screen. If the application attribute information is set to display an application execution screen on another area, the electronic device  100  may display a relatively distant application execution screen on a relatively near area (e.g., the second area). If the application attribute information is set to display an item for controlling the third application execution screen, the electronic device  100  may display, on a relatively near area (e.g., the second area), an item for controlling an application execution screen displayed on a relatively distant area (e.g., the first area). The term “relatively distant execution screen” means an application execution screen, i.e., one of screens  130   a  and  130   b , that is not close to the user&#39;s fingers for manipulation while the user holds the electronic device  100 , while the term “relatively near area” refers to an application execution screen that is close to the user&#39;s fingers for manipulation while the user holds the device. 
     The touch screen  130  may include a touch panel  131  and a display panel  132 . The touch panel  131  may detect a touch input or a hover input on the surface of the touch screen  130 . The touch panel  131  may create detection information in response to a user input and then deliver the created detection information to the control unit  140 . 
     In an embodiment of the present disclosure, the touch panel  131  may detect a touch input on each of the logically divided first and second areas. 
     The display panel  132  may be formed of a liquid crystal display (LCD), an active matrix organic light emitted diode (AMOLED), a flexible display, a transparent display, or the like. 
     The display panel  132  may display application execution screens on the logically divided first and second areas, respectively, under the control of the control unit  140 . 
     Additionally, the display panel  132  may display, on the second area, at least one item for controlling an application displayed on the first area under the control of the control unit  140 . 
     The control unit  140  may control the entire operation of the electronic device  100 . The control unit  140  may recognize the activation of a screen split function. When the screen split function is activated, the control unit  140  controls the display panel  132  to display the first application execution screen on the first area and also display the second application execution screen on the second area. In addition, the control unit  140  detects the occurrence of an event for executing the third application. This event may occur in order to execute a new application while respective application execution screens are displayed on the divided screen areas. For example, the third application execution event may be a call reception, a message reception, a notification reception, a music playback, a camera activation, and the like. In an embodiment of the present disclosure, in response to the third application execution event, the control unit  140  may control the display panel  132  to display the second application execution screen on the first area and also display the third application execution screen on the second area. 
     In another embodiment of the present disclosure, when the third application execution event is received, the control unit  140  may control the display panel  132  to display at least one item for controlling the third application execution screen on the second application execution screen. This control item may be a button for controlling the third application displayed on the first area. 
     If the execution of the third application is terminated while the third application execution screen and/or the control item of the third application are displayed in response to the third application execution event, the control unit  140  may control the display panel  132  to display a state before the third application execution event is detected. The control unit  140  may control the display panel  132  to display the first application execution screen on the first area and also display the second application execution screen on the second area. 
     In another embodiment of the present invention, when the execution of the third application is terminated, the control unit  140  may control the display panel  132  to remove the at least one item for controlling the third application from the second area. At this time, the control unit  140  may further control the display panel  132  to remove the third application execution screen from the first area and instead display the first application execution screen on the first area. 
       FIG. 3  is a flowchart illustrating a process of controlling a display of application execution screens according to an embodiment of the present disclosure.  FIG. 4  shows screenshots illustrating a process of controlling a display of application execution screens according to an embodiment of the present disclosure. 
     In step  301 , the control unit  140  recognizes that a screen split function is activated. The screen split function may be set by a user to display respective application execution screens on logically divided areas of the screen in a multitasking environment. 
     In step  303 , as shown in screenshot  410  of  FIG. 4 , the control unit  140  controls the display panel  132  to display the first application execution screen on the first area  401  of the touch screen  130  and also display the second application execution screen on the second area  402 . The first application execution screen may be executed by a user. An application executed in the first application execution screen may always maintain an executed state, and this function may be set by a user. In the first application execution screen, one of a specific application selected by a user, a predefined default application, a recently executed application, and a frequently executed application may be displayed in the form of a widget, a shortcut, an icon, and the like. A display form may be not limited to these examples. 
     When a notification application is executed in the first application execution screen as shown in screenshot  410  of  FIG. 4 , the control unit  140  controls the display panel  132  to display a notification application execution screen in the form of widget. The first application execution screen may be displayed at the same layer as the second application execution screen is displayed. 
     In step  305 , the control unit  140  determines whether an event for executing a third application occurs. This third application execution event may occur in order to execute a new application while respective application execution screens are displayed on the first and second areas  401  and  402 . For example, the third application execution event may be a call reception, a message reception, a notification reception, a music playback, a camera activation, and the like. 
     If the third application execution event does not occur, the control unit  140  controls the display panel  132  to maintain a current screen display. The first and second application execution screens may still be displayed on the first and second areas,  401  and  402 , respectively. 
     If the third application execution event occurs, in step  307  the control unit  140  controls the display panel  132  to display a screen based on the attribute of an application corresponding to the third application execution event. 
     Specifically, the control unit  140  may control the display panel  132  to display the third application execution screen executed in response to the third application execution event on the first area  401  and also display the second application execution screen on the second area  402 . Subsequently, based on the attribute of the third application, the control unit  140  may control the display panel  132  to display the third application execution screen on the second area  402  and also display the second application execution screen on the first area  401 , as shown in screenshot  420  of  FIG. 4 . At this time, the first application execution screen and the third application execution screen may be seen as if having exchanged locations. The attribute of an application executed in response to the third application execution event may be information about a display location of an application execution screen. This attribute may be set during development of the application, during manufacture of the electronic device, as one of user defined settings, and the like. 
     In an embodiment of the present disclosure, the control unit  140  controls the display panel  132  to display a message application execution screen as the second application execution screen on the first area  401  according to the attribute of the third application executed in response to the third application execution event. Also, the control unit  140  may control the display panel  132  to display a call application execution screen as the third application execution screen on the second area  402 . For example, the attribute of a call application as the third application may be set to move an application execution screen. 
     In step  309 , the control unit  140  determines whether the execution of the third application is terminated. For example, the end of a call, the completed reception of a message, the termination of a music playback, the deactivation of a camera, and the like may be considered as the termination of the third application. As shown in screenshot  430  of  FIG. 4 , the control unit  140  recognizes the termination of the third application when an incoming call is ended. 
     The control unit  140  may perform step  307  until the execution of the third application is terminated. Namely, if the execution of the third application is not terminated, the control unit  140  may control the display panel  132  to display the third application execution screen on the second area  402  and also display the second application execution screen on the first area  401 . 
     When the execution of the third application is terminated, the control unit  140  controls the display panel  132  to display the first application execution screen on the first area  401  and also display the second application execution screen on the second area  402  in step  311 , as shown in screenshot  440  of  FIG. 4 . 
     In an embodiment of the present application, when a call application (i.e., the third application) is terminated as shown in screenshot  440  of  FIG. 4 , the control unit  140  may control the display panel  132  to display a notification widget execution screen on the first area  401  and also display a message application execution screen on the second area  402 . The notification widget execution screen displayed on the first area  401  may correspond to the first application executed before the execution of the third application, as in screenshot  410  of  FIG. 4 . 
       FIG. 5  is a flowchart illustrating a process of controlling a display of application execution screens according to another embodiment of the present disclosure.  FIGS. 6 to 9  shows screenshots illustrating a process of controlling a display of application execution screens according to embodiments of the present disclosure. 
     Referring to  FIGS. 5 and 6 , in step  501 , the control unit  140  recognizes that a screen split function is activated. The screen split function may be set by a user to display respective application execution screens on logically divided areas of the screen in a multitasking environment. 
     When the screen split function is activated, in step  503  the control unit  140  controls the display panel  132  to display the first application execution screen on the first area  601  and also display the second application execution screen on the second area  602  as shown in screenshot  610  of  FIG. 6 . In the first application execution screen, one of a specific application selected by a user, a predefined default application, a recently executed application, and a frequently executed application may be displayed in the form of a widget, a shortcut, an icon, and the like. 
     As shown in screenshot  610  of  FIG. 6 , the control unit  140  controls the display panel  132  to display a notification application execution screen as the first application execution screen in the form of widget on the first area  601 . The control unit  140  controls the display panel  132  to display a message application execution screen as the second application execution screen on the second area  602 . 
     In step  505 , the control unit  140  determines whether an event for executing the third application occurs. This third application execution event may occur in order to execute a new application while respective application execution screens are displayed on the first and second areas  601  and  602 . For example, the third application execution event may be a call reception, a message reception, a notification reception, a music playback, a camera activation, and the like. 
     If the third application execution event occurs, in step  507  the control unit  140  controls the display panel  132  to display a screen based on the attribute of an application corresponding to the third application execution event. 
     Specifically, the control unit  140  controls the display panel  132  to display the third application execution screen executed in response to the third application execution event on the first area  601 . Then, based on the attribute of the third application, the control unit  140  controls the display panel  132  to display at least one item for controlling the third application execution screen overlapping onto the second area  602 . At this time, the attribute of the third application may be set by a user to display at least one item for controlling the third application execution screen on the second area  602 . This item may control the third application executed in response to the third application execution event and may be displayed as, e.g., a button, an icon, and the like. 
     In an embodiment of the present disclosure, if the control unit  140  is set to display an item  603  for controlling the third application execution screen overlapping onto the second area  602 , the control unit  140  controls the display panel  132  to display this control item  603  on the second area  602  as shown in screenshot  620  of  FIG. 6 . For example, the item  603  for controlling the third application execution screen may be a call accept button  603   a  and a call reject button  603   b . Through these control items  603 , the control unit  140  may control an application executed in response to the third application execution event. For example, when the call accept button  603   a  is selected, a call is connected. A user may determine a display location of the control item  603  and whether to use the control item  603 . The control item  603  may be displayed at an upper layer in relation to the first and second application execution screens. The control item  603  may also be displayed in the form of a floating button. 
     In step  509 , the control unit  140  determines whether the execution of the third application is terminated. If an end call button  603   c  is selected as shown in screenshot  630  of  FIG. 6 , the control unit  140  determines that the execution of the third application is terminated. For example, the end of a call may be recognized as the termination of the third application. 
     The control unit  140  controls the display panel  132  to display the item  603  for controlling the third application execution screen on the second application execution screen until the execution of the third application is terminated. 
     Meanwhile, when the execution of the third application is terminated, the control unit  140  controls the display panel  132  to remove the control item  603  from the screen in step  511  as shown in screenshot  640 . Further, the control unit  140  may control the display panel  132  to display the first application execution screen on the first area  601  and also display the second application execution screen on the second area  602 , as in screenshot  610  of  FIG. 6 . 
       FIGS. 7 to 9  are based on the assumption that the third application has an attribute set to display an item for controlling the third application execution screen. 
     Referring to  FIG. 7 , as shown in screenshot  710 , the control unit  140  controls the display panel  132  to display the first application execution screen  701  and the second application execution screen  702  on a split screen of the touch screen  130 . For example, the first application execution screen  701  may be displayed on an upper part of the touch screen  130 , and the second application execution screen  702  may be displayed on a lower part of the touch screen  130 . When a screen split function is activated, the control unit  140  may execute respective applications and also control the display panel  132  to display the corresponding application execution screens  701  and  702 . For example, as shown, a bank application and a message application may be executed in the first and second application execution screens  701  and  702 , respectively, in screenshot  710 . Alternatively, any other application such as a game application, a gallery application, and the like may be executed. Different applications executed in the first and second application execution screens  701  and  702  may be executed and controlled separately and independently. 
     While the first and second application execution screens  701  and  702  are displayed separately, the control unit  140  may receive an event for executing the third application. This event may occur in order to execute a new application while respective application execution screens are displayed on the divided screen areas. For example, the third application execution event may be a call reception, a message reception, a notification reception, a music playback, a camera activation, and the like. In response to the third application execution event, the control unit  140  may control the display panel  132  to display the third application execution screen corresponding to the third application execution event. At this time, the control unit  140  may change one of currently displayed application execution screens to the third application execution screen. For example, the control unit  140  may control the display panel  132  to display the third application execution screen instead of the first application execution screen. 
     The control unit  140  may determine whether the attribute of the third application is set to display the first and second application execution screens to other areas or to display at least one item for controlling the third application execution screen. 
     In an embodiment of the present disclosure, the third application may be an alarm application as shown in screenshot  720  of  FIG. 7 . If the alarm application has an attribute to display an item  703  for controlling an alarm application execution screen on the second area, the control unit  140  controls the display panel  132  to display the control item  703  on the second area  702  as shown in screenshot  720 . The control item  703  may be formed of a first button  703   a  and a second button  703   b  and may be displayed at an upper layer in relation to the displayed application execution screens, as shown in screenshot  730  of  FIG. 7 . 
     The control unit  140  determines whether the execution of the alarm application (i.e., the third application) is terminated. For example, when the control item  703  is selected, the control unit  140  may recognize that the execution of the alarm application is terminated. Subsequently, the control unit  140  controls the display panel  132  to remove the control item  703  from the screen. Further, as shown in screenshot  740 , the control unit  140  may control the display panel  132  to remove the alarm application execution screen (i.e., the third application execution screen) from the first area  701  and return to the display of the bank application execution screen (i.e., the first application execution screen) on the first area  701 , as in screenshot  710  of  FIG. 7 . 
     Referring to  FIG. 8 , the control unit  140  may divide the touch screen  130  logically and then control the display panel  132  to display the first application execution screen on the first area  801  and also display the second application execution screen on the second area  802 . 
     In an embodiment of the present disclosure, as shown in screenshot  810 , the control unit  140  controls the display panel  132  to display a notification application execution screen as the first application execution screen on the first area  801  and also displays a message application execution screen as the second application execution screen on the second area  802 . 
     The control unit  140  may receive an event for executing the third application. For example, the third application may be a camera application. The control unit  140  may identify the attribute of the third application. Then, based on the identified attribute, the control unit  140  determines a display location of the third application execution screen and whether to display an item for controlling the third application execution screen. 
     As shown in screenshot  820 , the control unit  140  controls the display panel  132  to display at least one item  803  for controlling the third application execution screen on the second area  802 . For example, this control item  803  may include a reverse button  803   a , a shutter button  803   b , and a flash button  803   c . In addition, the control unit  140  may control the display panel  132  to display the existing message application execution screen on the second area  802  and also display a camera application execution screen corresponding to the third application execution event on the first area  801 . For example, the camera application execution screen as the third application execution screen may be a preview image screen. 
     As shown in screenshot  830 , the control unit  140  detects the termination of the execution of the third application. For example, when the shutter button  803   b  is the control item selected, the control unit  140  recognizes that the execution of the third application is terminated. 
     In response to a selection of the shutter button  803   b , the control unit  140  stores a captured image in the memory unit  120  and also controls the display panel  132  to display the notification application execution screen which was displayed before the execution of the third application, on the first area  801 . 
     As shown in screenshot  840 , the control unit  140  controls the display panel  132  to remove the control item  803  from the second area  802  and also display the notification application execution screen on the first area  801 , as in screenshot  801  of  FIG. 8 . 
     Referring to  FIG. 9 , when the screen split function is activated, the control unit  140  controls the display panel  132  to display the first application execution screen on the first area  901  and also display the second application execution screen on the second area  902 , as shown in screenshot  910 . 
     As shown in screenshot  910 , the control unit  140  controls the display panel  132  to display a notification application execution screen on the first area  801  and also display a message application execution screen on the second area  802 . 
     The control unit  140  may detect an event for executing the third application while respective applications are executed in the first and second areas  901  and  902 . For example, the third application may be a music application, and the third application execution event may be a press of a button equipped in an earphone of the electronic device  100 . In response to this event, the third application execution screen is displayed on the first area  901 , as shown in screenshot  920 . 
     The control unit  140  may identify the attribute of the third application. Then, based on the identified attribute, the control unit  140  may determine a display location of the third application execution screen and whether to display an item  903  for controlling the third application execution screen. 
     As shown in screenshot  920 , the control unit  140  controls the display panel  132  to display at least one item  903  for controlling the third application execution screen on the second area  902 . For example, this control item  903  may include the first option button  903   a , the second option button  903   b , and the third option button  903   c , which for a music application, may include a reverse button, a playback/pause button, and a forward button, respectively. 
     In addition, the control unit  140  controls the display panel  132  to display the existing message application execution screen on the second area  902  and also display the music application execution screen corresponding to the third application execution event on the first area  901 . 
     Additionally, as shown in screenshot  930 , the control unit  140  determines whether the execution of the third application is terminated. For example, when the third option button  903   c  is the control item selected, the control unit  140  recognizes that the execution of the third application is terminated. 
     In response to a selection of the third option button  903   c , the control unit  140  may start to play the next music selection and also control the display panel  132  to display the first application execution screen which was displayed before the execution of the third application, on the first area  901 . 
     Further, as shown in screenshot  940 , the control unit  140  controls the display panel  132  to remove the control item  903  displayed in an overlapping form on the second area  902  and also displays the notification application execution screen on the first area  901 , as in screenshot  910 . 
     According to the embodiments discussed above, the electronic device  100  may change application execution screens displayed on divided screen areas and/or display a control item for an application displayed on the upper screen area on the lower screen area, depending on the attribute of the third application executed in response to a corresponding event. This is merely an example, and is not to be considered as a limitation. 
       FIG. 10  is a flowchart illustrating a process of controlling a display of application execution screens according to another embodiment of the present disclosure. 
     Referring to  FIG. 10 , in step  1001 , the control unit  140  recognizes that the screen split function is activated. The screen split function may be set by a user to display respective application execution screens on logically divided areas of the screen in a multitasking environment. 
     In step  1003 , the control unit  140  controls the display panel  132  to display the first application execution screen on the first area and also display the second application execution screen on the second area. 
     In step  1005 , the control unit  140  determines whether an event occurs for executing the third application to be newly displayed on the first area. For example, this event may be the arrival of an incoming call. 
     If the event for executing the third application occurs in step  1005 , the control unit  140  determines the attribute of the third application executed in response to the event, in step  1007 . The attribute of the third application may be set by a user so as to determine whether to move an application execution screen or to display a control item for an application, or both. Additionally or alternatively, the attribute of the third application may be set during development of the application, during manufacture of the electronic device, and the like. 
     In step  1009 , the control unit  140  determines whether the attribute of the third application is set to display the third application execution screen on any other area (e.g., the second area). 
     If the attribute of the third application is set to display the third application execution screen on any other area in step  1009 , the control unit  140  performs, in step  1011 , the steps  307  to  311  discussed above and as shown in  FIG. 3 . The control unit  140  may control the display panel  132  to display the third application execution screen, prearranged to be displayed on the first area, on the second area. Herein, the repetition of the same as described with reference to  FIG. 3  will be avoided. 
     If the attribute of the third application is set to display at least one control item for the third application execution screen in step  1009 , rather than displaying the third application execution screen itself, the control unit  140  performs, in step  1013 , the steps  507  to  511  discussed above and as shown in  FIG. 5 . The control unit  140  may control the display panel  132  to display the at least one control item for the third application execution screen displayed on the first area, on the second area. Herein, the repetition of the same as described with reference to  FIG. 5  will be avoided. 
     When different application execution screens are displayed on a split screen in a multitasking environment, an execution screen of a newly executed application may replace one of currently displayed screens and further move toward a user manipulable location. The split screen may have logically or physically divided screen areas. In some cases, only a control item for a newly executed application may be displayed at a user manipulable location. Such display schemes may allow a user to conduct easy and convenient one-handed manipulation. 
     Additionally, since only an application execution screen of a newly executed application or a control item is moved with other applications still being executed, a user can continue to conveniently use the existing applications. 
     While the present invention disclosure has been particularly shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the scope of the present disclosure should not be defined as being limited to these embodiments, but should be defined by the appended claims and equivalents thereof.