Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
  • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
  • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
  • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
  • H04N21/4316—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
  • H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
  • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
  • H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/47—End-user applications
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/47—End-user applications
  • H04N21/485—End-user interface for client configuration
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2340/00—Aspects of display data processing
  • G09G2340/12—Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
  • G09G2340/125—Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels wherein one of the images is motion video
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
  • H04N21/4433—Implementing client middleware, e.g. Multimedia Home Platform [MHP]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
  • H04N21/4438—Window management, e.g. event handling following interaction with the user interface

Definitions

• Apparatuses and methods consistent with the present invention relate to configuring multiple screens, and more particularly, to dynamically configuring multiple screens which provide multiple contents on a single physical display device and an apparatus for providing the multiple screens.
• TVs digital televisions
• digital set-top boxes provide only one content element on a single physical display device or simultaneously display a main screen and a sub-screen on a single physical display device.
• Content sources include a broadcast service such as a satellite broadcaster, a terrestrial broadcaster, or a cable broadcaster, a storage medium such as digital versatile discs (DVDs), or an external device connected to an input terminal.
• a broadcast service such as a satellite broadcaster, a terrestrial broadcaster, or a cable broadcaster
• a storage medium such as digital versatile discs (DVDs)
• DVDs digital versatile discs
• MHP Mobile Multimedia Subsystem
• ACAP Advanced Common Application
• OCAP Open Cable Application Platform
• HAVi Interoperability-based user interface
• the present invention provides an apparatus and method for dynamically configuring multiple screens which provide a plurality of contents on a physical display device.
• the present invention provides an overlay screen that is disposed at the outmost side of the display screen.
• an apparatus for providing multiple screens including a digital signal processing module which receives video information, audio information, or data information and restoring a service based on the video information, the audio information or the data information, a service processing module generating a plurality of display screens, logical screens and an overlay screen for displaying the restored service, and an output module mapping the plurality of logical screens generated by the service processing module to different locations on a display screen and allowing the overlay screen to overlay the display screen.
• an apparatus for providing multiple screens including a service processing module generating a display screen, a logical screen, and an overlay screen displaying a service and associating the produced logical screen and the overlay screen with the service, and an output module mapping the produced logical screen to a certain area on the produced display screen and allowing the overlay screen to overlay the display screen.
• an apparatus for providing multiple screens including a digital signal processing module receiving video information, audio information, or data information and restoring a service, a service processing module generating a display screen, logical screens, and an overlay screen for displaying the restored service, and an output module displaying the logical screens generated by the service processing module on an arbitrary area of a display screen and disposing the overlay screen so as to overlay the display screen.
• a method of dynamically configuring multiple screens includes receiving video in- formation, audio information, or data information and restoring a service, generating a display screen, logical screens and an overlay screen for displaying the restored service, mapping the logical screens to different locations on a display screen, and overlaying the overlay screen on the display screen.
• a method of dynamically configuring multiple screens includes generating a display screen, logical screens, and an overlay screen displaying a service, and mapping the logical screens to arbitrary areas on the display screen and overlaying the overlay screen on the display screen.
• FIGS. IA to IF are diagrams illustrating arrangements of a main screen and a sub- screen on a physical display device of according to a related art
• FlG. 2 is a diagram illustrating the relationship between a logical screen, an overlay screen, and a display screen according to an exemplary embodiment of the present invention
• FIGS. 3 A to 3E are diagrams illustrating a configuration of a screen including a mapper according to an exemplary embodiment of the present invention
• FIGS. 4 A to 4C are diagrams illustrating a method of independently overlaying various graphic contents on a display screen according to an exemplary embodiment of the present invention
• FIGS. IA to IF are diagrams illustrating arrangements of a main screen and a sub- screen on a physical display device of according to a related art
• FlG. 2 is a diagram illustrating the relationship between a logical screen, an overlay screen, and a display screen according to an exemplary embodiment of the present invention
• FIGS. 3 A to 3E are diagrams illustrating a configuration of
• FIGS. 5 A to 5C are diagrams illustrating a method of using a plurality of graphic surfaces for one overlay screen according to an exemplary embodiment of the present invention
• FIGS. 6 A and 6B are diagrams illustrating applied examples of an overlay screen according to an exemplary embodiment of the present invention
• FlG. 7 is a block diagram illustrating service sources according to an exemplary embodiment of the present invention
• FIGS. 8 A and 8B are diagrams illustrating a non-abstract service and an abstract service according to an exemplary embodiment of the present invention
• FIGS. 9 A and 9B are diagrams illustrating attribute information and interfaces of a logical screen, and an overlay screen
• FlG FlG.
• FIGS. 1 IA and 1 IB are diagrams each illustrating an attribute 'Display_Area' of a logical screen according to exemplary embodiments of the present invention
• FlG. 12 is a diagram illustrating a method of mapping three services to a display screen according to an exemplary embodiment of the present invention
• FlG. 13 is a block diagram illustrating a configuration of an apparatus for providing multiple screens according to an exemplary embodiment of the present invention
• FlG. 14 is a flowchart illustrating a method of dynamically configuring multiple screens according to an exemplary embodiment of the present invention
• FlG. 15 is a diagram illustrating a software architecture for providing multiple screens according to an exemplary embodiment of the present invention.
• FlG. 16 is a diagram illustrating the relationships among modules constituting an application programming interface (API) layer according to an exemplary embodiment of the present invention
• FlG. 17 is a flowchart illustrating a method of displaying a plurality of services that are displayed on logical screens and an overlay screens on a display screen by the modules illustrated in FlG. 16 according to an exemplary embodiment of the present invention.
• FlG. 18 is a flowchart illustrating a method of exchanging services displayed on logical screens between the modules illustrated in FlG. 16 according to an exemplary embodiment of the present invention.
• These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks.
• the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that are executed on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
• Each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of the order. For example, two blocks illustrated in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
• the term 'service' indicates a group of multimedia contents displayed together, i.e., a group of service components.
• Service components are elements of a service and include a video component, an audio component, and a data component.
• a data component is an application in a service.
• the application is classified into an unbound application and a service bound application. Since the unbound application has a high priority, the resource is smoothly allocated.
• a monitor application corresponds to a specific unbound application that has the highest priority.
• the service bound application is associated to a transport stream, and allows a lower priority than that of the unbound application.
• the service bound application does not function as a critical system. When a competition for resources occurs, the service bound application has a larger possibility of abandoning the resource allocation than the unbound application.
• the service bound application includes a conjunction type that operates in conjunction with a stream that is being transported and a non- conjunction type that operates independently from the stream.
• the term 'service context' indicates an object which can control the executing of a service and includes various resources, devices, and execution state information needed for providing a service.
• the term 'physical display device' indicates a physical device which actually displays the content of a service, an output port which outputs the content of a service or a storage medium which stores a service.
• the term 'display screen' indicates a screen actually displayed on a physical display device.
• An arbitrary service may be directly set in the display screen, and the display screen may be displayed on a physical display device.
• at least one logical screen which is mapped to a certain area of the display screen may be displayed on the physical display device.
• the term 'logical screen' indicates a space in which an arbitrary service is displayed.
• a logical screen is a virtual screen before being mapped to a display screen and thus is not displayed on a physical display device.
• the logical screen and the display screen may be a combination of a background still image, a video raster, and a graphic raster.
• the graphic raster may be a combination of text, lines, colors, and images or a mixture of video frames.
• the term 'overlay screen' indicates a space in which subtitles and various functions including volume selection and mute selection) are displayed and the overlay screen overlaps the display screen.
• the overlay screen is disposed at the outmost side of the display screen.
• a plurality of overlay screens can be displayed on the display screen to overlap different locations on the display screen.
• the overlay screens display data component of services transmitted from a terrestrial broadcast, a cable broadcast, a personal video recorder (PVR).
• PVR personal video recorder
• the overlay screen stores the transmitted data component in a storage medium and then maps to the display screen.
• the overlay screen overlays the display screen on the basis of discrimination information of the overlay screens or an attribute 'z-Order' that determines the order of arranging the overlay screens on a z-axis of the display screen.
• the discrimination information of the overlay screen indicates that a screen is an overlay screen.
• the value of the attribute 'z-Order' of the overlay screen is larger than those of logical screens that are applicable to be mapped to the display screen.
• a screen having the discrimination information of the overlay screen is set to be absolutely positioned at the foremost of the display screen.
• One or more overlay screens may be provided. In this case, the order of the overlay screens on the z-axis is determined on the basis of an attribute value of 'z-Order' of the overlay screen.
• the overlay screen is suitable for displaying the unbound application, rather than the service bound application, because the unbound application is easily displayed on the entire display screen regardless of the configuration of the display screen.
• EPG electronic program guide
• 'main service' indicates a service that is selected as a main service through a menu displayed on the physical display device or a remote controller by a user or through an API by an application, and the screen on which the main service is displayed is referred to as a 'main screen'.
• 'Picture-in-Picture service' indicates a service that is selected as a sub-service in the main service through a menu displayed on a physical display device or a remote controller by a user via an API by an application, and the PiP service may be displayed on a picture-in-picture screen (PiP screen) or a main screen.
• the PiP screen includes a screen that occupies a part of another screen as illustrated in FIGS. IA to ID and a screen that is simultaneously displayed with another screen without overlapping the other screen as illustrated in FIGS. IE to IF.
• FIG. 2 is a diagram illustrating the relationship between a logical screen, an overlay screen, and a display screen according to an exemplary embodiment of the present invention.
• a service may be displayed using logical screens 210, 212, and
• the logical screens 210, 212, and 214 are mapped to display screens 220, 222, and 224 through a mapping block 230.
• the overlay screen 216 overlaps the entire display screens 220, 222, 224 separately from the mapping block 230.
• the overlay screen 216 must overlap a display screen to which a plurality of logical screens are mapped. Further, a plurality of overlay screens may overlap the display screen.
• the logical screens 210 and 212 and the overlay screen 216 are mapped to the display screen 220 and overlap the display screen 220, the logical screens 212 and 214 are mapped to the display screen 222, and the logical screens 210, 212, and 214 and the overlay screen 216 are mapped to the display screen 224 and overlap the display screen 224.
• At least one logical screen which displays a service is mapped to an arbitrary area of a display screen by the mapping block 230.
• the overlay screen 216 may overlap an arbitrary location of the display screen separately from the mapping block 230.
• the mapping block 230 is a group of various pieces of information needed for mapping a logical screen to a display screen.
• the various pieces of information include coordinate information of a predetermined area on a display screen to which each of a plurality of logical screens is mapped, discrimination information of the logical screens and the display screen, and information specifying in what order the logical screens are displayed on the display screen.
• the mapping block 230 can change the size of the logical screen so to be allocated in an arbitrary area of the display screen. That is, the mapping block 230 can perform scaling of the logical screen and allocating of the position thereof, and FIGS. 3 A to 3E are diagrams illustrating a configuration of the screen including a mapper as the mapping block.
• the main screen including a combination of a background still image B, a video raster V, and a graphic raster G is mapped to the entire display screen by a mapper with a normal size.
• the PiP screen including only video components is mapped to the entire display screen by the mapper with a reduced size.
• the mapped PiP screen is displayed on the main screen, which is determined depending on a Z value.
• the reference character Z refers to z-order value which will be described later.
• the overlay screen may be combined with the display screen.
• the overlay screen is a specific screen disposed at the outmost side, and may be used when providing a caption function.
• the PiP screen may have only a video component as illustrated in FIG. 3 A, or may have a combination of the background still image B, the video raster V, and the graphic rater G as illustrated in FIG. 3B.
• the main screen including the combination of the background still image B, the video raster V, and the graphic rater G is mapped to the entire display screen by the mapper with a normal size.
• Two PiP screens #1 and #2 having only video component is mapped to an arbitrary area of the display screen by the mapper with a reduced size.
• the mapped PiP screen is disposed on the main screen and the Z value can be constantly maintained.
• the overlay screen may be combined with the display screen.
• the configuration of the screen may have a plurality of PiP screens including only video components as illustrated in FIG. 3C or a plurality of PiP screens including a combination of the background still image B, the video raster V, and the graphic rater G as shown in FIG. 3D.
• FIG. 3E Picture-outside-picture (POP) screens are illustrated in FIG. 3E. It can be understood that the conventional PiP screen is displayed inside the main screen and the POP screen is displayed outside the main screen.
• the plurality of PiP screens #1 and #2 including a combination of the background still image B, the video raster V, and the graphic rater G are mapped to arbitrary areas of the display screen by the mapper with a reduced size. In this case, the Z value of the mapped POP screens #1 and #2 may be constantly maintained. Further, the overlay screen may be combined with the display screen.
• the mapping block 230 may be realized by interfaces or functions prepared by various computer program languages to be executed and create or change the relationship between the logical screen and the display screen by using the above information as parameters.
• mapping block 230 may be realized by a hardware which has a mapping function between a logical screen and a display screen.
• services provided by various service sources may be displayed on a display screen, and the display screen may be displayed on a physical display device, as illustrated in FIGS. 4A to 4C.
• FIGS. 4 A to 4C are diagrams illustrating a method of independently overlaying various graphic contents on a display screen according to an exemplary embodiment of the present invention, that is, a method of overlaying a plurality of overlay screens on the display screen.
• the graphic content of the service must be directly connected to the graphic surface included in the respective overlay screen.
• a main screen configured by a combination of a background still image B, a video raster V, and a graphic raster G is mapped to the entire display screen without changing the size.
• a PiP screen configured by a combination of the background still image B, the video raster V, and the graphic raster G is mapped to an arbitrary location of the display screen with a reduced size.
• the mapped PiP screen is disposed on the main screen, which is determined by a z- value.
• the character 'z' refers to a value of z-order.
• overlay screens only having graphic component overlay the display screen. In this case, the z- value of the overlay is maximum, and thus the overlay screen overlaps an outermost side of the display screen screens. In this case, a mapper is not used for the overlay screens.
• a main screen configured by a combination of a background still image B, a video raster V, and a graphic raster G is mapped to the entire display screen without changing the size.
• a PiP screen configured by a combination of the background still image B, the video raster V, and the graphic raster G is mapped to an arbitrary location of the display screen with a reduced size.
• two overlay screens #1, #2 only having graphic component overlay the display screen. In this case, z-values of the overlay screens may be same or different from each other.
• a main screen configured by a combination of a background still image B, a video raster V, and a graphic raster G is mapped to the entire display screen without changing the size.
• a PiP screen configured by a combination of the background still image B, the video raster V, and the graphic raster G is mapped to an arbitrary location of the display screen with a reduced size.
• a plurality of overlay screens #1, and #N only having graphic component overlay the display screen. In this case, z- values of the overlay screens may be same or different from each other.
• FIGS. 5 A to 5C are diagrams illustrating a method of using a plurality of graphic surfaces for one overlay screen according to an exemplary embodiment of the present invention.
• a service context with one overlay screen, it is possible to display graphic contents of the service associated with the overlay screen.
• FIG. 5 A is a diagram illustrating a single plane overlay screen.
• the single graphic surface is used for closed captioning or for jointly using the closed captioning and another function (for example, volume selection, mute selection, a user interface for setting function).
• another function for example, volume selection, mute selection, a user interface for setting function.
• This renewal can be reduced by updating subsets (for example, the subsets in the changed area) of the visual pixels.
• the latent renewal and these optimizing methods cause complex coding and increased debugging. Further, operation and memory cycles are increased. In contrast, a minimum hardware resource is needed in the setting. For example, the hardware compositor or multiple graphic surfaces are not needed.
• FIG. 5B illustrates a dual plane overlay screen.
• a compositor and a second graphic surface are added to separate the function from the other functions that are jointly used in a user interface for closed captioning and a second graphic surface (Gs).
• the added graphic surface is jointly used in an application environment including a native environment embodying an equipment setting function. However, this is independent of the PiP and PoP setting.
• An unbound application may preferably be used to display the overlay screen separately from a graphic of the current service bound application.
• the co-operation is performed by requesting the renewal of the function by a mutual exclusion basis or for the displaying timing.
• the previous setting of the overlay screen is generalized by providing a distinct graphic surface for closed captioning and the respective application environment.
• FIG. 5C illustrates N plane overlay screen.
• the abovementioned generalization provides the simplest system architecture during requesting a basic resource, that is, an exclusive graphic surface for the respective environment.
• the shape and the resolution of the overlay screen are expected to be constantly maintained and conformed to the shape of the entire display device.
• the exclusive graphic surface in the overlay screen is preferably used by the unbound application, not by the service bound application. It is because the exclusive graphic surface is independent of the PiP and POP setting, and the exclusive graphic surface can use the entire display graphic having a constant resolution separately from the graphic of the service bound application.
• the above use supplies a visual mark for a user that makes the application of the screen be in focus for the shake of unreserved input event dispatch, permits outline drawing without any limitations by an application, and provides a title for the PiP and POP screen.
• FIGS. 6A and 6B are diagrams illustrating an applied example of an overlay screen according to an exemplary embodiment of the present invention.
• in focus screen refers a screen including an application that obtains an event when a user transfers an input event by using an interface such as a remote controller.
• the overlay screen can be used to indicate a border of the screen or a title of the service displayed on the screen.
• FIG. 7 is a diagram illustrating examples of service sources according to an exemplary embodiment of the present invention.
• service sources which provide broadcast services such as a terrestrial broadcaster 320 and a cable broadcaster 330, service sources which provide services stored in a storage medium such as a PVR 340, and service sources (not illustrated in FIG. 7) which provide services via a wired network or a wireless network.
• a broadcast receiver 310 receives services from the service sources and produces logical screens and overlay screens displaying each of the received services.
• an arbitrary service is directly set on the display screen to be displayed on a physical display device using a predefined method or a method set by a user or an application. Otherwise, at least one logical screen that is mapped to an arbitrary area on the display screen and the overlay screen that overlaps the display screen is displayed on a physical display device 350.
• services provided by the terrestrial broadcaster 320, the cable broadcaster 330, and the PVR are displayed on the physical display device 350.
• the terrestrial broadcaster 320, the cable broadcaster 330, and the PVR 340 are illustrated in FIG. 7 as being service sources, but the present invention is not limited to it. Any type of multimedia content source which provides multimedia contents that can be displayed together can be a service source according to an exemplary embodiment of the present invention.
• Services according to an exemplary embodiment of the present invention can be classified into abstract services and non-abstract services, as illustrated in FIGS. 8 A and 8B.
• the abstract services are not services provided by broadcast signals transmitted in real time but services independent of broadcast channels.
• the abstract services include only data components, i.e., application, without video components and audio components. Examples of the abstract services include services having unbound applications based on the OCAP standard.
• both abstract services and non-abstract services are independent.
• abstract services may be directly set on the physical display device not through logical screens and non-abstract services may be displayed on the logical screens and the overlay screen.
• the logical screens may be mapped to the display screen in which the abstract services are set. Thereafter, the display screen may be output through the physical display device.
• the abstract services can be displayed on the display screen independently of the non-abstract services.
• the abstract services and non-abstract services may be mapped to different logical screens. Thereafter, the logical screens may be mapped to a single display screen. In other words, the abstract services can be displayed on the display screen independently of non-abstract services.
• the logical screen, the overlay screen, and the display screen may be categorized as being different objects.
• a screen may serve as a logic screen, an overlay screen, or a display screen according to attribute information of one screen object.
• a screen object is a logical screen or a display screen or an overlay screen depends on the 'type' information among screen object attributes.
• Attribute information of the screen object includes a plurality of attributes 'z-
• FIG. 9A and 9B illustrates attribute information of a screen object and interfaces for processing the attributes of the screen.
• An attribute 'Type' 510 is for determining a screen type - a logical screen or a display screen.
• An attribute 'z-Order' 520 is for determining in an order in which a plurality of logical screens and overlay screens are arranged along the z-axis.
• the overlay screen may not include the attribute 'z-Order' 520.
• FIG. 10 illustrates different configurations of logical screens on a physical display device for different combinations of the values of attributes 'z-Order' of the logical screens and the overlay screen.
• first and second logical screens 620 and 630 are respectively mapped to predetermined areas of a display screen 610 and the overlay screen 640 overlays the display screen 610.
• the first logical screen 620 is displayed on the display screen 610
• the second logical screen 630 is displayed on the first logical screen 620
• the overlay screen 640 is displayed on the second logical screen 630.
• the display screen 610, the first logical screen 620, the second logical screen 630, and the overlay screen are sequentially arranged in the direction of the z- axis.
• an attribute 'z-Order' of the first logical screen 620 may be set to a value of 1
• an attribute 'z-Order' of the second logical screen 630 may be set to a value of 2
• an attribute 'z-Order' of the overlay screen 640 may be set to a value of 3.
• the attributes 'z-Order' of the first and second logical screens 620 and 630 and the overlay screen 640 may be set to any numbers or characters as long as they can represent a certain order in which the first and second logical screens 620 and 630 and the overlay screen 640 are to be arranged along the z-axis.
• An attribute 'Display_Area' 530 is information regarding a display screen area of a logical screen, as to be illustrated in FIGS. 1 IA and 1 IB.
• FlG. 1 IA illustrates that a logical screen 710 is mapped to an entire area of the display screen 720
• FlG. 1 IB illustrates that a logical screen 730 is mapped to a partial area of the display screen 740.
• the attribute 'Display_Area' may include information specifying the two- dimensional coordinates of a predetermined portion of a display screen to which the logical screen is to be mapped or may include information specifying a predetermined location on the display screen and an offset value indicating how much the logical screen deviates from the predetermined location on the display screen.
• An attribute 'Visibility' 540 determines whether a logical screen is to be visibly or invisibly displayed on a display screen. It is possible to make a logical screen appear on or disappear from a display screen by altering the value of the attribute 'Visibility' 530.
• An attribute 'Associated_Display_Screen' 550 is information regarding display screens associated with a logical screen.
• a logical screen which is not associated with any display screens may not be displayed on a physical display device nor be transmitted to external output devices.
• An attribute 'Associated_Service_Contexts' 560 is information regarding service contexts connected to a logical screen, an overlay screen, or a display screen. Services set in such service contexts may be displayed on a logical screen, an overlay screen, or a display screen.
• An attribute 'OutputPort' 570 is information regarding devices by which a display screen is to be output, and such devices include display screens, wired/wireless communication media, and various storage media.
• An attribute 'Overlay-Information' 580 includes discrimination information of overlay screen indicating that a screen is an overlay screen, and positional information indicating that the overlay screen overlays an arbitrary location of the display screen. The overlay screen can be positioned at the foremost of the display screen through the attribute 'Overlay-Information'.
• the interfaces may include an interface 'SET' for setting attribute values or connecting a logical screen to a display screen, an interface 'ADD' for adding attribute values or connecting a logical screen to a service, an interface 'GET' for identifying attribute values, and an interface 'REMOVE' for deleting attribute values.
• These interfaces may include processes, functions, procedures, or methods that perform their functions, respectively.
• a method 'getDisplayScreen(void)' returns a display screen associated with the current screen.
• the method 'getDisplayScreen(void)' returns the associated display screen.
• the method 'getDisplayScreen(void)' returns reference information regarding the current screen.
• the method 'getDisplayScreen(void)' returns a value of 'NULL'.
• IUegalStateException' provides a function for mapping the current logical screen to a predetermined area of the associated display screen.
• An instance that is provided as a parameter is of a class 'HScreenRectangle' of a package 'org.havi.ui', and has two-dimensional position information.
• the execution of the methods 'SecurityException' and 'IUegalStateException' may be conducted as an exceptional operation for the method 'setDis- playScreen(HScreen screen)'.
• the method 'IUegalStateException' may be executed when the current screen is a logical screen or when a portion of a display screen associated with a current logical screen cannot change due to the characteristics of a host platform.
• a method 'getOutputArea(void)' returns regional information of a current screen as HScreenRectangle information. If the current screen corresponds to a display screen, the method 'getOutputArea(void)' returns HScreenRectangle information having the same value as HScreenRectangle (0,0,1,1). If the current screen is a logical screen, the method 'getOutputArea(void)' returns information regarding an area on a display screen occupied by the current screen. If the current screen is a logical screen but is not associated with any display screen, the method 'getOutputArea(void)' returns a value 'NULL'.
• FlG. 12 is a diagram illustrating a process that three services are set on three logical screens to be mapped to a single display screen.
• a first service includes all the three service components, i.e., video, audio, and data components, a second service includes only video and audio components, and a third service includes only data component.
• the present invention does not impose any restrictions on service components, and the first and second services illustrated in FlG. 12 are exemplary.
• the first, second and third services are displayed on a physical display device in almost the same manner as in the related art.
• the logical screen displays services by being mapped to the display screen, but the overlay screen displays services without being mapped.
• FlG. 13 is a block diagram of an apparatus for providing multiple screens according to an exemplary embodiment of the present invention.
• an apparatus 900 for providing multiple screens includes a digital signal processing module 940, a service processing module 950, an output module 960, and a user/application interface module 965.
• the apparatus 900 includes a broadcast signal reception module 910, a storage medium 920, and an external input module 930 as service sources, and includes a physical display device 970, a storage medium 980, and an external output module 990 as service output media.
• a module means, but is not limited to, a software or hardware component, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), which performs certain tasks.
• a module may advantageously be configured to reside on the addressable storage medium and configured to execute on one or more processors.
• a module may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
• the functionality provided for in the components and modules may be combined into fewer components and modules or further separated into additional components and modules.
• the digital signal processing module 940 receives various information of a service such as a multimedia content, e.g., video information, audio information, or data information, from the broadcast signal reception module 910, the storage medium 920, or the external input module 930.
• a multimedia content e.g., video information, audio information, or data information
• the broadcast signal reception module 910 receives a satellite, terrestrial, or cable broadcast signal and transmits the received broadcast signal
• the storage medium 920 stores video information, audio information, or data information of a service
• the external input module 930 receives video information, audio information, or data information of a service from an external device such as a network interface module connected to a network.
• the digital signal processing module 940 restores a plurality of services using received service components.
• the restored services include abstract or non-abstract services.
• the phrase 'a plurality of services' refers to two or more services transmitted by the broadcast signal reception module 910 or two or more services respectively transmitted by the broadcast signal reception module 910 and the storage medium 920.
• the digital signal processing module 940 may restore services according to selection by a user or an application with the aid of the user/application interface module 965.
• the user or the application may select the connection between an arbitrary service and a screen.
• the service processing module 950 produces a logical screen, an overlay screen, and a display screen to display a service restored by the digital signal processing module 940.
• the output module 960 maps a plurality of logical screens produced by the service processing module 950 to the display screen and overlays the overlay screen on the display screen.
• the mapping of the logical screens to the display screen or overlapping of the overlay screen on the display screen may be conducted using a predefined method or a method set by the user with the aid of the user/application interface module 965.
• a service restored by the digital signal processing module 940 may not be processed by the service module 950. Instead, a service restored by the digital signal processing module 940 may be directly mapped to a certain portion of a display screen produced by the output module 960.
• a display screen provided by the output module 960 may be displayed on the physical display device 970 or may be stored in the storage medium 980.
• Examples of the storage medium 980 include computer readable floppy discs, hard discs, CD-ROM. DVD, DVD-ROM, BD (Blu-ray Disc), and semiconductor memories.
• a display screen provided by the output module 960 may be transmitted to an external device connected to a network via the external output module 990.
• the output module 960 may include a plurality of output ports via which a display screen can be provided.
• a display screen can be provided via an output port set in advance as a default or an output port chosen by the user with the aid of the user/application interface module 965.
• the user or the application can choose one of a plurality of services or restore desired services using the user/application interface module 965. Also, the user can choose one of a plurality of display screens using the user/application interface module 965.
• FIG. 14 is a flowchart illustrating a method of dynamically configuring multiple screens according to an exemplary embodiment of the present invention.
• video information, audio information, and data information constituting a multimedia content are transmitted in a predetermined format, for example, an MPEG stream format.
• an apparatus for providing a service such as a multimedia content service receives video information, audio information, and data information and restores a service based on the video information, the audio information, and the data information.
• the service restored in operation SlOlO may be selected or previously determined by a user or an application.
• the user may use a menu displayed on the display device or a remote controller to select the connections between an arbitrary screen and a screen.
• the application may select the connections using an API.
• data information includes application information regarding application for a service, and these application information includes signal information indicating whether the application can be executed on a PiP screen.
• application information examples include an application information table (AIT) based on the MHP standard and an extended application information table (XAIT) based on the OCAP standard.
• the signal information may be added to the application information.
• the restored service is set such that it can be displayed on a logical screen or an overlay screen.
• the logical screen is mapped to a display screen and the overlay screen overlays the display screen.
• the display screen is provided to the user using a display screen, a storage medium, or a network.
• the restored service is illustrated in FIG. 14 as being displayed on a physical display device via a logical screen. However, the restored service may be directly displayed on a physical display device without passing through the logical screen.
• the PiP service is realized in two modes. In the first mode, only video component for PiP service selected on the main screen is provided without creating a separate logical screen for PiP service, that is, PiP screen.
• FIG. 14 illustrates a method of mapping and overlaying only one service to a display screen for simplicity. However, a plurality of services may be mapped to or overlay a display screen with or without passing through a plurality of logical screens or overlay screens. [147] When a display screen is provided to the user in this manner, the user can perform a plurality of services.
• FIG. 15 is a diagram illustrating a software architecture for providing multiple screens according to an exemplary embodiment of the present invention. [149] Referring to FlG. 15, a software architecture 1100 includes a device driver layer
• the device driver layer 1110 receives service components from various multimedia content sources and decodes the received service components. Examples of the received service components include video information, audio information, and data information.
• the API layer 1120 generates a logical screen, an overlay screen, and a display screen and maps a service, the logical screen, the overlay screen, and the display screen to one another.
• the application layer 1130 provides a user interface so that a user can dynamically configure the logical screen and the overlay screen which display a service or transmits a user command to the API layer 1120 so that the API layer 1120 can execute the user command.
• the user enables the device driver layer 1110 with the aid of the application layer
• the user can enable the device driver layer
• the device driver layer 1110 may include a plurality of output ports which can provide a display screen.
• API layer 1120 may include the plurality of output ports.
• the API layer 1120 may include a plurality of software modules, e.g., a multiscreen manager module ' MultiScreenManager ' 1210, a multiscreen context module ' Multi-
• ScreenContext' 1230 a multiscreen context listener module ' MultiScreenCon- textListener' 1250, and a multiscreen context event module ' MultiScreenContextEvent'
• the multiscreen manager module 1210 manages the multiscreen context module
• the multiscreen context module 1230 is an interface object associated with a screen object 1220 and determines whether the screen object 1220 is to become a logical screen, an overlay screen, and a display screen according to an interface operation performed by the multiscreen context module 1230.
• Various attributes such as the attributes 510 through 570 illustrated in FIGS. 9 A and 9B may be set in the multiscreen context module 1230.
• the multiscreen context module 1230 can provide the functions 'SET', 'ADD', 'GET', and 'REMOVE' described above with reference to FIGS. 9A and 9B.
• the multiscreen context event module 1240 serves as an event class announcing that the attribute information of the screen object 1220 has been changed
• the multiscreen context listener module 1250 serves as a listener interface object which can be realized in a predetermined application class which attempts to receive an event prompted by the multiscreen context event module 1240.
• An application 1260 is a module which is driven on the application layer 1130.
• the application 1260 allows the user to choose a desired service and to freely arrange a plurality of logical screens or overlay screens on a display screen.
• the application 1260 transmits various commands which allow the user to dynamically configure and manage logical screens or overlay screens to the multiscreen manager module 1210, and the multiscreen manager module 1210 controls operations corresponding to the various commands to be executed through the multiscreen context module 1230.
• the multiscreen context module 1230 is associated with the screen object 1220 and manages the attribute information of the screen object 1220 illustrated in FIGS. 9 A and 9B.
• the multiscreen context module 1230 may include a variety of functions or methods.
• the multiscreen manager module 1210 may be performed so as to receive various service components supplied from various sources of a device driver layer 1110 to display on the logical screens, the overlays screen, or the display screen. These functions may be performed by an additional module (not illustrated).
• FIG. 17 is a flowchart illustrating a method of displaying a plurality of services displayed on logical screens and overlay screens by the modules illustrated in FIG. 16 on a display screen according to an exemplary embodiment of the present invention.
• the multiscreen manager module 1210 produces a display screen and a number of logical screens, corresponding to the number of services to be performed, and overlay screens.
• the multiscreen manager module 1210 connects the logical screens and the overlay screen to respective corresponding services received from the device driver layer 1110.
• the multiscreen manager module 1210 may call a method 'addServiceContext' for each of the logical screens and a method 'addServiceContext' of overlay screen by setting service context objects of the received services as parameters for the logical screens and the overlay screen.
• the method 'addServiceContext' connects a logical screen and an overlay screen to a service and may be provided by the multiscreen context module 1230.
• a method 'addServiceContext' may be represented by a format 'voidaddSer- viceContext(javax.tv.service.selection.ServiceContext context, booleasshowCC) throws java.lang.SecurityException, java-langJUegalStateException'.
• a parameter 'showCC is a boolean type parameter for determining a use of the overlay screen. If the parameter 'showCC is true, the method 'addServiceContext' displays subtitles through the overlay screen. If the parameter 'showCC is false, the method 'addServiceContext' conducts an application through the overlay screen.
• the multiscreen manager module 1210 connects the logical screens and the overlay screen to the display screen.
• the multiscreen manager module 1210 may call a method 'setDisplayScreen' for each of the logical screens by setting a display screen object to which the logical screens are connected as a parameter.
• the method 'setDisplayScreen' connects a logical screen to a display screen and may be provided by the multiscreen context module 1230.
• the overlay screen can call the method 'setOverlaylnformation' of the overlay screen object.
• the method 'setOverlaylnformation' functions as a method for notifying that the screen is an overlay screen, and is supplied from the multiscreen context module 1230.
• a method 'setDisplayScreen' may be set to 'public void setDisplayScreen (HScreen screen) throws SecurityException, Illegal StateException', and this method allows an instance 'HScreen' that is provided as a parameter to be associated with the current logical screen.
• the instance 'HScreen' is preferably a display screen.
• a parameter of the method 'setDisplayScreen(HScreen screen)' may include a value of 'NULL'. In this case, when the method 'setDisplayScreen(HScreen screen)' is executed without exception handling, the current logical screen is no longer associated with the display screen.
• the method 'IllegalStateException' may be executed when a current screen is a logical screen or when a portion of a display screen associated with a current logical screen cannot change due to the characteristics of a host platform.
• operation S 1340 when the logical screens and the overlay screen are connected to the service and a plurality of logical screens and the overlay screen is connect to a single display screen, areas on the display screen to which the logical screens and the overlay screen are to be respectively mapped are determined. At this time, a predetermined method provided by the multiscreen context module 1230 can be called to determine an area on the display screen where the logical screens and the overlay screen are to be displayed.
• FlG. 18 is a flowchart illustrating a method of exchanging services displayed on logical screens between the modules illustrated in FlG. 16 according to an exemplary embodiment of the present invention.
• the multiscreen manager module 1210 temporarily terminates a service to be exchanged between two logical screens.
• service information regarding a service connected to logical services is exchanged between the logical services, thereby obtaining the effect of exchanging a main screen and a sub-screen.
• service information regarding a service connected to logical services is exchanged between the logical services, thereby obtaining the effect of exchanging a main screen and a sub-screen.
• operation S1430 occurrence of an event in which the connection between the service and the two logical screens has been changed is generated. Thereafter, in operation S 1440, the multiscreen context event module 1240 transmits the event to the multiscreen context listener module 1250, and a service newly connected to the two logical screens begins to be performed.

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