JP6355468B2 - Display device - Google Patents

Description

  The present invention relates to a display device for playing back video content.

  In recent years, electronic advertisement display devices using video display devices are increasing in place of conventional advertisements using print media. The electronic advertisement display device is called “digital signage”.

  Patent Document 1 discloses a technology (hereinafter also referred to as “Related Technology A”) for displaying content (electronic advertisement) that effectively combines advertisement information and program information. Specifically, in Related Technology A, various information and contents are acquired via a network. Also, in Related Technology A, a viewer effect index indicating a viewer's reaction is acquired using a camera, and the viewer effect index is fed back to the content distribution management center (server). Accordingly, it is possible to provide content (advertisement) that increases the viewing effect for each signage terminal.

  Patent Document 2 discloses a technique (hereinafter also referred to as “Related Technology B”) for obtaining an effect equivalent to that of digital signage even in a store or the like that is not equipped with a network device. Specifically, in Related Technology B, digital signage is simply realized by using only the display device using information such as time.

JP 2010-039726 A JP 2010-190954 A

  However, the related technologies A and B have the following problems. Specifically, in Related Technology A, a signage terminal having a communication function displays content received from a content distribution server via a network. The signage terminal incorporates a communication module in advance. Therefore, Related Technology A cannot be applied to a terminal (device) that does not have a communication function, and has a problem that versatility is low.

  Related technology B can be applied to a device that does not have a communication function. That is, the related technology B can solve the above-described problems of the related technology A. However, in the related art B, if the external memory does not store the reproduction target data, the user needs to remove the external memory from the display device and store the reproduction target data in the external memory. Therefore, there is a problem that it takes time and effort to the user.

  Accordingly, a configuration using an external memory having a function of performing wireless communication with the outside (hereinafter referred to as “configuration A”) is conceivable. In the configuration A, if the external memory does not store the reproduction target data, the external memory can acquire the reproduction target data by wireless communication. That is, in the configuration A, even when the external memory does not store the reproduction target data, it is not necessary for the user to remove the external memory from the display device. In the configuration A, since the data state of the external memory may change, it is required to manage the data state of the external memory.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a display device capable of managing the state of data in an external memory having a function of performing wireless communication.

In order to achieve the above object, a display device according to one embodiment of the present invention communicates with an external memory having a function of performing wireless communication with the outside. The external memory has a function of storing data including video content, a function of acquiring the video content from outside by wireless communication, and storing the acquired video content, and the display device includes the external memory By accessing the memory, a detection unit for detecting a data change that is a change in the state of the stored data that is the data stored in the external memory, and the video content stored in the external memory A reproduction unit for reproducing, and a control unit for performing an update process for updating management information for managing the stored data when the detection unit detects the data change, and the display device includes the display device. The display device further includes a broadcast receiving unit for receiving broadcast content, and the display device is controlled based on control data for controlling The control data indicates information related to the transmission source of the broadcast content, the external memory performs wireless communication with an external terminal, and the display device further includes a memory control unit that communicates with the external memory, The external memory operates as a Web server, the control unit generates an operation Web application that displays a list of transmission sources of the broadcast content based on the control data, and the memory control unit Based on an operation on the external terminal that displays the operation Web application that displays the transmission source list, the Web reception is stored in the external memory, and the broadcast reception unit is configured to display the transmission source list. Change the transmission source for receiving broadcast content .

  According to the present invention, the display device communicates with an external memory having a function of performing wireless communication. When the detection unit detects a data change that is a change in the state of the stored data in the external memory, the control unit performs an update process for updating the management information for managing the stored data.

  Thereby, it is possible to manage the data state of the external memory having a function of performing wireless communication.

It is a figure which shows the structure of the signage system which concerns on Embodiment 1 of this invention. 1 is a block diagram of a display device according to Embodiment 1 of the present invention. It is a figure which shows an example of a structure of signage setting data. It is a figure which shows an example of a structure of reproduction | regeneration setting data. 10 is a flowchart of data management processing N. It is a flowchart of the data management process A. It is a figure which shows an example of a structure of broadcast content setting data. 10 is a flowchart of data management processing B. It is a flowchart of the data change detection process A.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof may be omitted.

<Embodiment 1>
FIG. 1 is a diagram showing a configuration of a signage system 1000 according to Embodiment 1 of the present invention. The signage system 1000 includes an operation terminal 100 and a display device 200.

  The operation terminal 100 has a display area R1. The display area R1 is an area (screen) for displaying an image. The operation terminal 100 has a function of performing wireless communication. The wireless communication is, for example, communication according to a wireless LAN (Local Area Network) standard. The operation terminal 100 has a wireless communication mode as an operation (communication) mode. The wireless communication mode is enabled or disabled by the operation terminal 100. The operation terminal 100 in which the wireless communication mode is enabled can perform wireless communication with the outside. The operation terminal 100 is, for example, a smartphone or a tablet terminal.

  The display device 200 has a display area R2. The display area R2 is an area (screen) for displaying an image. The display device 200 has a plurality of types of sensors (not shown). The sensor is, for example, a sensor that detects the brightness around the display device 200.

  The display device 200 is configured such that the external memory M1 is detachable. The external memory M1 includes a processor (not shown) for performing various processes. The processor executes an application (program) or the like. The external memory M1 has a function of performing wireless communication with the outside. The wireless communication is, for example, communication according to a wireless LAN standard. The external memory M1 is, for example, a memory card. The form of the external memory M1 is not limited to a card, but may be another form (for example, a disk).

  The display device 200 has a memory slot (not shown). For example, the memory slot is provided on a side surface portion of the display device 200. The external memory M1 is attached to the memory slot. Hereinafter, the state of the display device 200 in which the external memory M1 is mounted in the memory slot is also referred to as “memory mounting state”. In the memory mounted state, the display device 200 communicates with the external memory M1. In the memory mounted state, the external memory M1 is not visible from the front of the display device 200.

  The external memory M1 has a function of storing data. The external memory M1 is provided with a storage area (not shown). The storage area is an area for storing data. The data is, for example, an operation Web application, video content, setting data, and the like. The operation web application is an application for operating the display device 200.

  In the present specification, the video content includes a still image and a moving image. The video content is advertising content. The video content is, for example, content for digital signage. Hereinafter, the video content for advertisement is also referred to as “signage content”. That is, signage content that is data is stored in the external memory M1.

  The external memory M1 includes a register (not shown). The register stores a numerical value. Hereinafter, the value stored in the register is also referred to as “register value”. The initial value of the register value is “0”.

  The external memory M1 has an access point function and a Web server function. The access point function is a function for realizing that the external memory M1 performs wireless communication with the operation terminal 100. Specifically, the external memory M1 has an access point mode as an operation (communication) mode. The access point mode is validated or invalidated by the external memory M1. The operation terminal 100 can perform wireless communication with the external memory M1 in which the access point mode is enabled.

  The Web server function is a function for operating the external memory M1 as a server of the operation terminal 100. The Web server function is a function for providing operation means to the operation terminal 100, for example. Specifically, the external memory M1 has a Web server mode as an operation mode. The Web server mode is a mode for performing wireless communication according to, for example, HTTP (Hypertext Transfer Protocol). That is, the external memory M1 has a function of performing wireless communication according to HTTP. The Web server mode is validated or invalidated by the external memory M1. The operation terminal 100 can perform wireless communication with the external memory M1 by regarding the external memory M1 with the Web server mode enabled as a Web server.

  The external memory M1 has a function of acquiring video content from the outside by wireless communication and storing the acquired video content, as will be described in detail later.

  The display device 200 has a normal mode and a signage mode as operation modes. The normal mode is a mode for displaying an image in the display region R2. The signage mode is a mode for playing signage content.

  Next, a detailed configuration of the display device 200 will be described. FIG. 2 is a block diagram of display device 200 according to Embodiment 1 of the present invention. Referring to FIG. 2, display device 200 includes control unit 201, memory control unit 202, setting data management unit 204, reproduction unit 205, detection unit 207, broadcast reception unit 208, and nonvolatile memory 209. And an output unit 210.

  The control unit 201 controls each unit in the display device 200. The control unit 201 is, for example, a CPU (Central Processing Unit). The memory control unit 202 communicates with the external memory M1 in the above-described memory mounting state. In other words, the memory control unit 202 accesses the external memory M1 in the above-described memory mounting state.

  The setting data management unit 204 manages the signage setting data DT1. The signage setting data DT1 is control data for controlling the display device 200. Specifically, the signage setting data DT1 is data for controlling the reproduction of the signage content on the display device 200.

  The signage setting data DT1 is stored in the nonvolatile memory 209. The signage setting data DT1 may be stored in the setting data management unit 204.

  The reproduction unit 205 reproduces the signage content according to the information indicated by the signage setting data DT1.

  FIG. 3 is a diagram illustrating an example of the configuration of the signage setting data DT1. The signage setting data DT1 includes setting data DT1a, DT1b, and DT1c. Each of the setting data DT1a, DT1b, and DT1c is data corresponding to each row of the signage setting data DT1 in FIG.

  In FIG. 3, “setting ID” is information for identifying setting data. “Item name” is the name of the item to be set. For example, the item name “power off time” is the time until the power of the display device 200 is turned off.

  In FIG. 3, “control value” is a value that specifies control related to an item to be set. In the setting data DT1a having the setting ID “1”, any one of “0” to “3” is set as a control value. In the setting data DT1b having the setting ID “2”, any one of “0” to “23” is set as a control value. In the setting data DT1c having the setting ID “3”, either “0” or “1” is set as the control value. Hereinafter, the set control value indicated by the setting data DT1a, DT1b, and DT1c is also referred to as “setting control value”.

  For example, in the setting data DT1a, when the setting control value is “2”, the display device 200 in the signage mode plays a moving image (signage content). For example, in the setting data DT1c, when the setting control value is “1”, the signage mode display device 200 drives a predetermined sensor.

  In the following, information related to a method for reproducing signage content (video content) is also referred to as “reproduction related information”. The reproduction related information is, for example, a control value indicated by the signage setting data DT1 in FIG. That is, the signage setting data DT1, which is control data, indicates reproduction related information.

  Referring to FIG. 2 again, the playback unit 205 plays back signage content (video content) based on the playback-related information, details of which will be described later.

  Although details will be described later, the detection unit 207 accesses a register of the external memory M1 in the memory mounted state in order to detect a change in the state of data stored in the external memory M1. The broadcast receiving unit 208 is a component for receiving broadcast content from the outside using an antenna or the like (not shown). Broadcast content is, for example, video content that complies with the standard of digital broadcasting.

  The setting data management unit 204 manages the reproduction setting data DT2. The reproduction setting data DT2 is control data for controlling the display device 200. Specifically, the reproduction setting data DT2 is data for controlling detailed settings in the signage content reproduction on the display device 200.

  The reproduction setting data DT2 is stored in the nonvolatile memory 209. The reproduction setting data DT2 may be stored in the setting data management unit 204.

  FIG. 4 is a diagram illustrating an example of the configuration of the reproduction setting data DT2. The reproduction setting data DT2 includes a plurality of image quality setting data and sound quality setting data. Each image quality setting data is data corresponding to a row indicating “image quality setting” in the reproduction setting data DT2. Each sound quality setting data is data corresponding to a row indicating “sound quality setting” in the reproduction setting data DT2. Hereinafter, each of the image quality setting data and the sound quality setting data is also referred to as “reproduction data”.

  In FIG. 4, “setting ID” is information for identifying data for reproduction (image quality setting data, sound quality setting data). The “setting name (major classification)” is the name of the setting target item belonging to the major classification. The setting target of the image quality setting data indicating the large classification “image quality setting” is image quality. The setting target of the sound quality setting data indicating the large classification “sound quality setting” is sound quality.

  In FIG. 4, “setting name (small classification)” is the name of the setting target item belonging to the small classification. The said small classification is a classification equivalent to the detailed setting of the item shown by said large classification. The “maximum value” is a maximum value that can be set for the item (eg, backlight) indicated by the “setting name (small classification)” corresponding to the maximum value. The “minimum value” is a minimum value that can be set for an item (eg, backlight) indicated by “setting name (small classification)” corresponding to the minimum value. The “current value” is a set value that is currently set. The setting value is a value set for the item indicated by “setting name (small classification)”.

  Note that the reproduction-related information described above is, for example, the current value indicated by the reproduction setting data DT2 in FIG. That is, the reproduction setting data DT2 that is control data indicates reproduction related information.

  Referring to FIG. 2 again, output unit 210 outputs video content. Specifically, the output unit 210 includes an audio output unit 211 and a display unit 212. The audio output unit 211 is a speaker. The display unit 212 is a display for displaying an image. The display unit 212 displays an image in the display region R2 as necessary.

  Note that all or part of the control unit 201, the memory control unit 202, the setting data management unit 204, the reproduction unit 205, the detection unit 207, and the broadcast reception unit 208 are configured by hardware such as LSI (Large Scale Integration). Also good. In addition, all or part of the control unit 201, the memory control unit 202, the setting data management unit 204, the reproduction unit 205, the detection unit 207, and the broadcast reception unit 208 are executed by a processor such as a CPU (Central Processing Unit). It may be a module of a program.

  Next, the general operation of the signage system 1000 will be described. It is assumed that the user has installed the external memory M1 in the memory slot of the display device 200. In this case, power is supplied to the external memory M1. Then, the external memory M1 validates the access point mode. Thereby, the external memory M1 functions as a Web server.

  Further, the display device 200 confirms whether or not the video content (signage content) exists in the external memory M1 at the time when the memory mounting state occurs. When the video content exists in the external memory M1, the display device 200 automatically reproduces the video content.

  Next, the operation terminal 100 validates the wireless communication mode. As a result, the operation terminal 100 can wirelessly communicate with the external memory M1 in the access point mode.

  Next, the operation terminal 100 activates a web browser and displays the web browser in the display area R1. The operation terminal 100 performs wireless communication with the external memory M1 that functions as a Web server (HTTP server). Note that the operation terminal 100 downloads an operation Web application from the external memory M1 as necessary, and displays the operation Web application on the Web browser. As described above, the operation Web application is an application for operating the display device 200.

  Next, the user operates the operation Web application displayed on the Web browser displayed on the display area R1 by the operation terminal 100. As a result, the operation terminal 100 transmits video content, control commands, and the like to be played back by the display device 200 to the display device 200. Hereinafter, the data stored in the external memory M1 is also referred to as “stored data”. The stored data is, for example, video content, signage setting data, and the like. That is, the stored data includes video content.

  The external memory M1 further stores file management information. The file management information is management information (directory entry) for managing stored data. The file management information indicates file information. The file information indicates information indicating the location of storage data, storage data creation date and update date, storage data size, and the like. Note that the video content in the external memory M1 is stored in, for example, a predetermined directory. A structure composed of directories, data (stored data), and the like is referred to as a “file system”.

  The display device 200 constantly monitors the state of data stored in the external memory M1. When the display device 200 detects a change (update) in the stored data, the display device 200 stops the reproduction of the video content. Then, the display device 200 updates the file management information, the file system, and the like in the external memory M1. Next, the display device 200 resumes playback of the video content based on the updated file management information.

  The above is a rough operation of the signage system 1000.

  Next, processing when the power of the display device 200 is turned on (hereinafter also referred to as “start-up processing”) will be described.

  Here, it is assumed that the startup process is performed in the premise N. In the premise N, the signage setting data DT1 indicates the control value of the signage mode and the like. In the premise N, it is assumed that the state of the display device 200 is a memory mounting state. Further, in the premise N, it is assumed that signage setting data DT1 is stored in the external memory M1 in advance. Note that the signage setting data DT1 may not be stored in the external memory M1.

  When the power of the display device 200 is turned on, the control unit 201 is first activated in the startup process. Then, the control unit 201 transmits a signage setting request instruction to the memory control unit 202. The signage setting request instruction is an instruction for requesting the setting data DT1a indicated by the signage setting data DT1.

  Next, the memory control unit 202 transmits the received signage setting request instruction to the external memory M1. When the external memory M1 stores the signage setting data DT1, the external memory M1 transmits the setting data DT1a indicated by the signage setting data DT1 to the control unit 201 via the memory control unit 202.

  On the other hand, when the external memory M1 does not store the signage setting data DT1, the external memory M1 transmits a non-existence notification to the control unit 201 via the memory control unit 202. The non-existence notification is a notification indicating that the external memory M1 does not store the signage setting data DT1.

  When the control unit 201 receives the non-existence notification, the control unit 201 transmits a signage setting request instruction to the setting data management unit 204. The setting data management unit 204 acquires the setting data DT1a indicated by the signage setting data DT1 stored in the nonvolatile memory 209 from the nonvolatile memory 209 in accordance with the signage setting request instruction. Then, the setting data management unit 204 transmits the setting data DT1a indicated by the signage setting data DT1 to the control unit 201.

  The control unit 201 transmits a reproduction start instruction to the reproduction unit 205 based on the control value of the setting data DT1a acquired from the external memory M1 or the setting data management unit 204. The reproduction start instruction is an instruction for starting reproduction of signage content (video content). The reproduction start instruction indicates an extension corresponding to the control value of the setting data DT1a. For example, when the control value of the setting data DT1a is “2” in FIG. 3, the signage content (video content) to be reproduced is a moving image. In this case, the reproduction start instruction indicates an extension (for example, “mpg”) that identifies the moving image.

  The playback unit 205 that has received the playback start instruction performs playback list creation processing. In the playlist creation process, the playback unit 205 performs a process for creating a playlist. The playback list is a list indicating information for specifying the video content to be played back, the order of playing back the video content to be played back, and the like. In the following, the name of signage content (video content) is also referred to as “content name” or “file name”.

  In the playlist creation process, the playback unit 205 extracts the content name (file name) of the signage content indicating the extension indicated by the playback start instruction from the external memory M1 via the control unit 201 and the memory control unit 202. . Then, the playing unit 205 creates a play list indicating the extracted content name. If there are a plurality of extracted content names, the playback unit 205 creates a playback list in which the plurality of content names are rearranged in, for example, alphabetical order.

  Then, the reproduction unit 205 reproduces signage content (video content) according to the reproduction list. Specifically, the playback unit 205 performs processing for acquiring the signage content having the first content name indicated by the playback list from the external memory M1 via the control unit 201 and the memory control unit 202. Then, the playback unit 205 plays back the acquired signage content.

  When the signage content is compressed, the playback unit 205 decodes the signage content. Then, the reproducing unit 205 transmits the image data and audio data obtained by the decoding to the output unit 210.

  In the output unit 210, the display unit 212 displays an image based on the received image data, and the audio output unit 211 outputs audio based on the received audio data.

  Next, a process (hereinafter also referred to as “data management process N”) performed by the display device 200 when the operating terminal 100 transmits signage content to the external memory M1 will be described.

  In general, when the state of data (stored data) stored in the external memory M1 changes, if the file management information is not updated so as to correspond to the change in the state of the stored data, the stored data is referred to from the outside. Can not. For example, when the signage content is further stored in the external memory M1, the file management information needs to be updated so that the stored data can be referred to based on the configuration of the stored data including the signage content in the external memory M1. is there. Therefore, the following data management process N is performed.

  Here, it is assumed that the Web server mode of the external memory M1 is enabled. That is, it is assumed that the external memory M1 operates as a Web server (HTTP server). Further, it is assumed that the operation terminal 100 downloads an operation Web application from the external memory M1 that operates as a Web server, and stores the operation Web application. Further, it is assumed that an operation web application is displayed on the web browser displayed on the display area R1 by the operation terminal 100.

  First, when the user performs the transmission operation M, the operation terminal 100 transmits the signage content to the external memory M1 using the operation Web application. The transmission operation M is an operation on the operation Web application (operation terminal 100) for transmitting signage content to the external memory M1.

  When the state of the stored data changes, the external memory M1 performs a register update process for notifying the display device 200 that the state of the stored data has changed. Hereinafter, the change in the state of stored data is also referred to as “data change”.

  Specifically, the external memory M1 performs a register update process when the reception of the signage content transmitted by the operation terminal 100 is completed and the signage content is stored. When the external memory M1 stores signage content, a data change occurs. That is, when a data change occurs, a register update process is performed.

  In the register update process, the external memory M1 changes the register value “0” to “1”. The register value “1” is a value for indicating a data change. That is, when a data change occurs, the register of the external memory M1 indicates a value for indicating the data change.

  FIG. 5 is a flowchart of the data management process N. Here, it is assumed that the data management process N is performed in the premise A1. In the premise A1, the state of the display device 200 is the memory mounting state. Under the premise A1, the reproduction unit 205 reproduces the signage content stored in the external memory M1 based on the above-described reproduction-related information. Here, it is assumed that the reproduction related information is, for example, the control value “2” indicated by the setting data DT1a. In this case, the reproduction unit 205 reproduces signage content that is a moving image. In the data management process N, first, the process of step S110 is performed.

  In step S110, a register value reference process is performed. In the register value reference process, the detection unit 207 accesses the register of the external memory M1 and refers to the register value of the register of the external memory M1.

  In step S120, the detection unit 207 determines whether or not the referenced register value is “1”. If YES in step S120, the detection unit 207 controls the external memory M1 to change the register value to “0”. When the register value is “1” (YES in step S120), a data change has occurred. Then, the process proceeds to step S130.

  On the other hand, if NO in step S120, the process of step S110 is performed again. When the register value is “0”, the register value reference process is repeated every time a fixed time elapses.

  In steps S110 and S120, the detection unit 207 performs processing for detecting a data change by accessing the external memory M1. If the register value is “1”, the detection unit 207 detects a data change. That is, the detection unit 207 detects a data change by referring to the register value of the external memory M1.

  In step S130, playback stop processing is performed. In the playback stop process, the control unit 201 transmits a playback stop instruction to the playback unit 205. The reproduction stop instruction is an instruction for stopping the signage content reproduction. The playback unit 205 stops the playback of the signage content according to the playback stop instruction.

  In step S140, the control unit 201 performs an update process N. Note that immediately before the update process N is performed, the control unit 201 cannot refer to the stored data from the outside due to a change in the state of the stored data. The outside is, for example, the control unit 201, the memory control unit 202, an application, or the like.

  The update process N is a process for updating (recreating) file management information that is management information. Specifically, the update process N updates the management information (file management information) so that the stored data can be referred to from the outside in a situation where the control unit 201 cannot refer to the stored data from the outside ( (Re-create). The update process N is a process for reconstructing the file system.

  Specifically, in the update process N, an unmount process and a mount process are performed. First, unmount processing is performed. In the unmount process, the control unit 201 controls the memory control unit 202 so that communication between the memory control unit 202 and the external memory M1 is stopped. As a result, the external memory M1 is unmounted.

  In the mounting process, the control unit 201 updates file management information, which is management information, so that stored data can be referred to from the outside via the memory control unit 202. Since the process for updating the file management information (directory entry) is a general process, detailed description will not be repeated. In short, the control unit 201 analyzes and lists the file information indicated by the file management information.

  When the detection unit 207 detects a data change in steps S120 and S140, the control unit 201 performs the update process N.

  In step S150, a playlist update process is performed. In the playlist update process, the control unit 201 updates the playlist using the content name of the signage content added to the external memory M1. For example, the control unit 201 updates the playlist by adding the content name of the added signage content to the playlist. The signage content added to the external memory M1 by the update of the playback list is also the content to be played back.

  In step S160, a reproduction process is performed. In the reproduction process, the control unit 201 controls the reproduction unit 205 so that the reproduction unit 205 reproduces the signage content for which reproduction has been stopped, based on the reproduction-related information indicated by the signage setting data DT1. As a result, the playback unit 205 plays the signage content whose playback has been stopped.

  Through steps S130, S140, and S160, the playback unit 205 stops the playback of the signage content (video content) before the update process N is performed, and the signage content whose playback is stopped after the update process N ends. Play.

  In step S170, the detection unit 207 controls the external memory M1 to change the register value to “0”. The external memory M1 changes the register value to “0” under the control of the detection unit 207. Thus, the data management process N ends.

  Next, a process for changing reproduction-related information using wireless communication (hereinafter also referred to as “setting change control process A”) will be described.

  Here, it is assumed that the setting change control process A is performed in the premise A2. In the premise A2, the signage setting data DT1 and the reproduction setting data DT2 are stored in the nonvolatile memory 209. Further, in the premise A2, the external memory M1 operates as a Web server (HTTP server). In the premise A2, the operation terminal 100 performs wireless communication with the external memory M1 that operates as a Web server. That is, the external memory M1 performs wireless communication with the operation terminal 100 that is an external terminal. In the premise A2, the above-described operation Web application is displayed on the Web browser displayed on the display area R1 by the operation terminal 100. Under the premise A2, the reproducing unit 205 reproduces the signage content stored in the external memory M1 based on the above-described reproduction related information.

  In the setting change control process A, the control unit 201 of the display device 200 transmits a setting data request instruction to the setting data management unit 204. The setting data request instruction is an instruction for requesting signage setting data DT1 and reproduction setting data DT2.

  The setting data management unit 204 reads the signage setting data DT1 and the reproduction setting data DT2 from the nonvolatile memory 209 in accordance with the setting data request instruction. Then, the setting data management unit 204 transmits the signage setting data DT1 and the reproduction setting data DT2 to the control unit 201.

  Next, an application generation process A is performed. In the application generation process A, the control unit 201 generates the operation Web application A1 using the signage setting data DT1 and the reproduction setting data DT2. Specifically, the control unit 201 generates an operation Web application A1 indicating each control value indicated by the signage setting data DT1 and each current value indicated by the reproduction setting data DT2.

  Each control value indicated by the signage setting data DT1 is information related to the reproduction of the signage content (video content). Each current value indicated by the reproduction setting data DT2 is information relating to the setting (setting at the time of reproduction) of signage content (video content).

  Note that the operation Web application A1 may indicate only each control value indicated by the signage setting data DT1 or only each current value indicated by the reproduction setting data DT2.

  That is, the operation Web application A1 is setting data indicating both or one of information related to signage content reproduction and information related to setting of the signage content.

  The operation Web application A1 is composed of HTML (Hypertext Markup Language), Java script, and the like. “Java” is a registered trademark.

  The operation Web application A1 has a function of displaying the above-described setting control value currently indicated by the signage setting data DT1. In the following, the current set control value is also referred to as “current value”. Further, the operation Web application A1 has a function of displaying each current value indicated by the reproduction setting data DT2.

  Further, when the setting control value (current value) indicated by the signage setting data DT1 is changed, the operation Web application A1 has a function of generating signage change data for changing the setting control value (current value). Have. The change data for signage indicates the setting ID of the setting data to be changed and the setting control value (control value) after the change. For example, when the control value “1” of the setting data DT1a in FIG. 3 is changed to “3”, the change data for signage indicates the setting ID “1” and the control value “3”.

  In addition, when the current value indicated by the reproduction setting data DT2 is changed, the operation Web application A1 has a function of generating reproduction change data for changing the current value. The reproduction change data indicates the setting ID of the setting data to be changed and the current value after the change. For example, when the current value “0” of the image quality setting data indicating the setting name “contrast” in FIG. 4 is changed to “5”, the reproduction change data includes the setting ID “11” and the current value “5”. Show.

  Further, the operation Web application A1 has a function of transmitting signage change data and reproduction change data to the external memory M1.

  Next, an application storage process A is performed. In the application storage process A, the control unit 201 transmits the operation Web application A1 to the memory control unit 202. The memory control unit 202 stores the operation Web application A1 in the external memory M1. The operation web application A1 is stored in the external memory M1 so that the operation terminal 100, which is an external terminal that performs wireless communication with the external memory M1, can refer to the operation web application A1 (setting data).

  Next, when the user performs an acquisition operation M, the operation terminal 100 uses the operation Web application to acquire the operation Web application A1 from the external memory M1 that operates as a Web server. The acquisition operation M is an operation for the operation Web application (operation terminal 100) for acquiring the operation Web application A1 from the external memory M1.

  Then, the operation terminal 100 displays the operation Web application A1 on the Web browser. Assume that the user performs a setting change operation M in this state. The setting change operation M includes a setting change operation Ma and a setting change operation Mb.

  The setting change operation Ma is, for example, an operation on the operation Web application A1 (operation terminal 100) for changing the setting control value (control value) that is the current value described above, which is indicated by the signage setting data DT1 in FIG. is there. It is assumed that the current value (control value) to be changed is, for example, the control value of the setting data DT1a in FIG. For example, it is assumed that the control value is changed from “1” to “3” by the setting change operation Ma.

  The setting change operation Mb is assumed to be an operation on the operation Web application A1 (operation terminal 100) for changing the current value indicated by the reproduction setting data DT2 in FIG. 4, for example. The current value to be changed is, for example, the current value of the contrast of the image quality setting data indicating the setting name “contrast” in FIG.

  When the setting change operation Ma is performed, the operation terminal 100 (operation web application A1) obtains the setting ID of the setting data indicating the changed control value and the changed setting control value (control value). The change data for signage shown is generated. Then, the operation terminal 100 transmits the change data for signage to the external memory M1 that operates as a Web server. The external memory M1 stores the received change data for signage.

  When the setting change operation Mb is performed, the operation terminal 100 (operation Web application A1) reproduces the setting ID of the setting data indicating the changed current value and the changed current value. Generate change data. Then, the operation terminal 100 transmits the reproduction change data to the external memory M1 that operates as a Web server. The external memory M1 stores the received reproduction change data.

  Further, the external memory M1 performs the above-described register update process when reception of data (signage change data, reproduction change data) transmitted from the operation terminal 100 is completed and the data is stored. Since the details of the register update processing have been described above, detailed description will not be repeated. As a result, the register value “0” is changed to “1”.

  The display device 200 performs the data management process A in FIG. 6 in parallel with the setting change control process A. In FIG. 6, the process with the same step number as the step number in FIG. 5 is performed in the same way as the process described with reference to FIG. The following description will focus on differences from the data management process N in FIG.

  Since steps S110 to S120 have been described above, detailed description will not be repeated. If the register value is “1”, the process of step S130 is performed.

  In step S130, the reproduction stop process described above is performed, and thus detailed description will not be repeated. Thereby, the reproduction of the signage content is stopped.

  In step S140, since the update process N described above is performed, detailed description will not be repeated.

  In step S150, the reproduction list update process described above is performed, and thus detailed description will not be repeated.

  In step S151A, a setting change handling process A is performed. In the setting change handling process A, the control unit 201 refers to the external memory M1 via the memory control unit 202. Then, the control unit 201 determines whether or not the external memory M1 stores at least one of signage change data and reproduction change data. When the external memory M1 does not store both the signage change data and the reproduction change data, the setting change handling process A ends.

  On the other hand, when the external memory M1 stores signage change data, signage change processing is performed. In the signage change process, the control unit 201 refers to the signage change data via the memory control unit 202. Then, the control unit 201 extracts the setting ID indicated by the signage change data and the changed setting control value.

  Then, the control unit 201 transmits a setting change instruction S1 to the setting data management unit 204. The setting change instruction S1 is an instruction for changing the control value in the signage setting data DT1. The setting change instruction S1 also indicates the extracted setting ID and the changed setting control value.

  In accordance with the setting change instruction S1, the setting data management unit 204 updates the signage setting data DT1 using the setting ID indicated by the setting change instruction S1 and the changed setting control value.

  Here, as an example, it is assumed that the setting change instruction S1 indicates the setting ID “1” and the changed setting control value “3”. In this case, the setting data management unit 204 changes the control value of the setting data DT1a of the setting ID “1” of the signage setting data DT1 to “3”.

  Also, the setting data management unit 204 notifies each unit (for example, the control unit 201 and the reproduction unit 205) of the change of the control value. Thereby, the changed item is immediately reflected in the signage content reproduction method. Next, the control unit 201 erases the change data for signage stored in the external memory M1 via the memory control unit 202.

  When the external memory M1 stores reproduction change data, reproduction change processing is performed. In the reproduction change process, the control unit 201 refers to the reproduction change data via the memory control unit 202. Then, the control unit 201 extracts the setting ID indicated by the reproduction change data and the current value after the change.

  Then, the control unit 201 transmits a setting change instruction S2 to the setting data management unit 204. The setting change instruction S2 is an instruction for changing the current value in the reproduction setting data DT2. The setting change instruction S2 also indicates the extracted setting ID and the current value after the change.

  In accordance with the setting change instruction S2, the setting data management unit 204 updates the reproduction setting data DT2 using the setting ID indicated by the setting change instruction S2 and the current value after the change.

  Here, as an example, it is assumed that the setting change instruction S2 indicates the setting ID “11” and the current value “5” after the change. In this case, the setting data management unit 204 changes the current value of the image quality setting data of the setting ID “11” of the reproduction setting data DT2 to “5”.

  The setting data management unit 204 notifies each unit (for example, the control unit 201 and the reproduction unit 205) of the change of the current value. Thereby, the changed item of the image quality and the sound quality is immediately reflected. Next, the control unit 201 erases the reproduction change data stored in the external memory M <b> 1 via the memory control unit 202.

  When the external memory M1 stores both or one of the change data for signage and the change data for reproduction, the control unit 201 uses both or one of the change data for signage and the change data for reproduction. An operation Web application is created that reflects setting data indicating both or one of the control value after the change and the current value after the change. Then, the memory control unit 202 overwrites the created operation web application on the operation web application stored in the external memory M <b> 1 according to the control of the control unit 201.

  In step S160, a reproduction process is performed as in FIG. In the reproduction process, the control unit 201 controls the reproduction unit 205 so that the reproduction unit 205 reproduces the signage content for which reproduction has been stopped, based on the reproduction-related information indicated by the signage setting data DT1. As a result, the playback unit 205 plays the signage content whose playback has been stopped.

  When the signage setting data DT1 is updated by the setting change handling process A described above, the control unit 201 controls the display device 200 according to the signage setting data DT1 that is the updated control data. That is, the control unit 201 controls the playback unit 205 so that the playback unit 205 plays back the signage content whose playback has been stopped based on the playback-related information indicated by the updated signage setting data DT1.

  Here, the signage content whose reproduction is stopped is assumed to be a still image as an example. The setting data indicating the changed control value is the setting data DT1a, and the setting control value after the change is “3”. In this case, the control unit 201 controls the playback unit 205 so that the playback unit 205 plays back the signage content (still image) whose playback has been stopped. Then, the control unit 201 further controls the playback unit 205 so that the playback unit 205 also plays back the broadcast content.

  In step S170, the above-described processing is performed, and thus detailed description will not be repeated. Then, the data management process A ends. As the data management process A ends, the setting change control process A also ends.

  By performing the setting change control process A and the data management process A described above, it is possible to change settings such as the signage content reproduction method, image quality, and sound quality. In the present embodiment, the signage content playback method, image quality, sound quality, and the like have been changed, but various settings such as initial settings of the display device may be changed.

  Next, a process for changing the channel selection of the display device 200 using the operation terminal 100 (hereinafter also referred to as “channel selection change control process B”) will be described. The channel selection change control process B is a process for changing the broadcast station that is the transmission source of the broadcast content.

  Here, it is assumed that the channel selection change control process B is performed in the premise A3. Under the assumption A3, the external memory M1 operates as a Web server (HTTP server). In the premise A3, the above-described operation Web application is displayed on the Web browser displayed on the display area R1 by the operation terminal 100. In the premise A3, the broadcast receiving unit 208 receives broadcast content from the outside.

  In the channel selection change control process B, broadcast content setting data DT3 is used. The broadcast content setting data DT3 is control data for controlling the display device 200, details of which will be described later. That is, the display device 200 is controlled based on the broadcast content setting data DT3. The broadcast content setting data DT3 is stored (managed) by the broadcast receiving unit 208. The broadcast content setting data DT3 may be stored in the nonvolatile memory 209.

  FIG. 7 is a diagram illustrating an example of the configuration of the broadcast content setting data DT3. The broadcast content setting data DT3 is composed of a plurality of broadcast setting data. Each broadcast setting data is data corresponding to a row in the matrix information indicated by the broadcast content setting data DT3.

  In FIG. 7, “channel number” is a number assigned to broadcast content. “Broadcasting station name” is the name of a broadcasting station that provides broadcast content. “TS_ID” is a transport stream ID. “TS_ID” is an ID for specifying a stream of broadcast content provided by the corresponding broadcast station. “Service ID” is an ID for specifying a broadcast service. TS_ID and service ID are information (hereinafter also referred to as “transmission source information”) related to the transmission source (broadcast station) of the broadcast content.

  In FIG. 7, the “channel selection flag” is a flag indicating whether or not a broadcast station specified by “broadcast station name” is selected as a broadcast station that is a transmission source of broadcast content. When the “channel selection flag” is “0”, it indicates that the corresponding broadcasting station is not selected. When the “channel selection flag” is “1”, it indicates that the corresponding broadcasting station is selected.

  In the broadcast content setting data DT3 of FIG. 7, for example, it is indicated that a broadcast station whose broadcast station name is “BBB TV” is selected as the broadcast station that is the transmission source of the broadcast content. In the following, the selected (selected) broadcast station is also referred to as “selected broadcast station”.

  In the channel selection change control process B, first, the control unit 201 of the display device 200 transmits a broadcast data request instruction to the broadcast receiving unit 208. The broadcast data request instruction is an instruction for requesting broadcast content setting data DT3. The broadcast receiving unit 208 transmits the broadcast content setting data DT3 to the control unit 201 in accordance with the broadcast data request instruction.

  Next, an application generation process B is performed. In the application generation process B, the control unit 201 generates an operation Web application B1 from a channel number, a broadcast station name, a TS_ID, a service ID, a channel selection flag, and the like indicated by the broadcast content setting data DT3. The operation Web application B1 is composed of HTML, Java script, and the like.

  The operation Web application B1 has a function of displaying a name of a selected broadcast station (eg, BBB television) and a channel number corresponding to the selected broadcast station. Further, the operation Web application B1 displays a list of a plurality of broadcast station names (channel names) that are selection candidates. In addition, the operation Web application B1 has a function of creating data for specifying a broadcast station selected by a user operation (hereinafter also referred to as “channel selection change data”). The selected broadcast station is a broadcast station different from the already selected broadcast station (selected broadcast station).

  The tuning change data is data (tuning change data) for changing the broadcast station that is the transmission source of the broadcast content. Although the channel selection change data will be described in detail later, it indicates information related to the broadcast content transmission source (broadcast station). The tuning change data is composed of a text file, for example. The tuning change data is control data for controlling the display device 200.

  Further, the operation Web application B1 has a function of transmitting channel selection change data to the external memory M1.

  Next, an application storage process B is performed. In the application storage process B, the control unit 201 transmits the operation Web application B1 to the memory control unit 202. The memory control unit 202 stores the operation Web application B1 in the external memory M1.

  Next, when the user performs an acquisition operation MB, the operation terminal 100 uses the operation Web application to acquire the operation Web application B1 from the external memory M1 that operates as a Web server. The acquisition operation MB is an operation for the operation Web application (operation terminal 100) for acquiring the operation Web application B1 from the external memory M1.

  Then, the operation terminal 100 displays the operation Web application B1 on the Web browser. Assume that the user performs a change operation MB in this state. The change operation MB is, for example, an operation for the operation Web application B1 (operation terminal 100) for changing the already selected broadcast station (selected broadcast station).

  When the change operation MB is performed, the operation Web application B1 (operation terminal 100) generates the above-described channel selection change data. As described above, the channel selection data is data for changing the broadcast station that is the transmission source of the broadcast content. The tuning change data indicates a TS_ID and a service ID corresponding to the broadcast station selected by the change operation MB. The TS_ID and the service ID indicated by the tuning change data that is control data are information (transmission source information) related to the transmission source (broadcast station) of the broadcast content.

  Note that the channel selection data may indicate a channel number corresponding to the broadcast station selected by the change operation MB, instead of the TS_ID and the service ID.

  Then, the operation terminal 100 transmits the channel selection data to the external memory M1 that operates as a Web server. The external memory M1 stores the received tuning change data.

  Here, as an example, it is assumed that the name of the selected broadcast station before the change operation MB is performed is “BBB television”. Further, it is assumed that a broadcast station whose name is “CCC television” is selected by the change operation MB. In this case, the tuning change data indicates TS_ID “0x3333” and service ID “0x0003”.

  Further, the external memory M1 performs the register update process described above when the reception of the data (tuning change data) transmitted from the operation terminal 100 is completed and the data is stored. Since the details of the register update processing have been described above, detailed description will not be repeated. As a result, the register value “0” is changed to “1”.

  The display device 200 performs the data management process B in FIG. 8 in parallel with the channel selection change control process B. In FIG. 8, the process with the same step number as the step number in FIG. 5 is performed in the same way as the process described with reference to FIG. The following description will focus on differences from the data management process N in FIG.

  Since steps S110 to S120 have been described above, detailed description will not be repeated. If the register value is “1”, the process of step S130 is performed.

  In step S130, the reproduction stop process described above is performed, and thus detailed description will not be repeated. Thereby, the reproduction of the signage content is stopped.

  In step S140, since the update process N described above is performed, detailed description will not be repeated.

  In step S150, the reproduction list update process described above is performed, and thus detailed description will not be repeated.

  In step S151B, a tuning change response process B is performed. In the tuning change handling process B, the control unit 201 refers to the external memory M1 via the memory control unit 202. Then, the control unit 201 determines whether or not the external memory M1 stores tuning change data. When the external memory M1 does not store tuning change data, the tuning change handling process B ends. On the other hand, when the external memory M1 stores tuning change data, tuning change processing is performed.

  In the channel selection change process, the broadcast receiving unit 208 changes the transmission source for receiving broadcast content based on the transmission source information. Specifically, in the channel selection change process, first, the control unit 201 refers to the channel selection change data via the memory control unit 202. And the control part 201 extracts TS_ID and service ID which the data for channel selection change show.

  Then, the control unit 201 transmits a channel selection change instruction to the broadcast receiving unit 208. The channel selection change instruction is an instruction for changing the selected broadcast station. The channel selection change instruction also includes the extracted TS_ID and service ID.

  The broadcast receiving unit 208 updates the broadcast content setting data DT3 using the TS_ID and the service ID indicated by the channel selection change instruction according to the channel selection change instruction.

  Here, as an example, it is assumed that the broadcast content setting data DT3 indicates various types of information in FIG. Further, it is assumed that the channel selection change instruction indicates TS_ID “0x3333” and service ID “0x0003”. In this case, the broadcast receiving unit 208 sets the channel selection flag corresponding to the channel number “2” in FIG. 7 to “0” and the channel selection flag corresponding to the channel number “3” to “1”. .

  Thereby, the transmission source of the broadcast content received by the broadcast receiving unit 208 is changed from the broadcast station whose broadcast station name is “BBB TV” to the broadcast station whose broadcast station name is “CCC TV”.

  In addition, when the external memory M1 stores tuning change data, the control unit 201 uses the information updated in the broadcast content setting data DT3 to reflect the updated information. Create an application. Then, the control unit 201 overwrites the created operation Web application on the operation Web application stored in the external memory M1 via the memory control unit 202.

  Next, the control unit 201 erases the tuning change data stored in the external memory M1 via the memory control unit 202.

  In step S160, as in FIG. 5, a reproduction process is performed, and thus detailed description will not be repeated.

  In step S170, the above-described processing is performed, and thus detailed description will not be repeated. Then, the data management process B ends. As the data management process B ends, the channel selection change control process B also ends.

  By performing the above tuning selection control process B and data management process B, the tuning of the display device 200 can be changed using the operation terminal 100. In the above description, the broadcast content is targeted. However, the operation terminal 100 is used to switch the display target of the display device 200 to video content, signage content, or the like received from the external input terminal. May be. Further, using the operation terminal 100, the display device 200 may activate a Web browser and allow the display device 200 to connect to an arbitrary URL.

  As described above, according to the present embodiment, display device 200 communicates with external memory M1 having a function of performing wireless communication. When the detection unit 207 detects a data change that is a change in the state of stored data in the external memory M1, the control unit 201 performs an update process for updating management information for managing the stored data.

  Thereby, it is possible to manage the data state of the external memory M1 having a function of performing wireless communication.

  Further, according to the present embodiment, a wireless communication function can be easily and inexpensively added to the display device 200 that does not have a wireless communication function. Thereby, the display device 200 can realize remote change of the signage content to be reproduced by wireless communication from the operation terminal 100.

  Further, according to the present embodiment, the operating terminal 100 changes (updates) the signage content that the display device 200 plays. Note that the data management process N is performed as described above. Therefore, the display device 200 can easily detect that the operation terminal 100 has changed the signage content for the display device 200 to play.

  Further, according to the present embodiment, the operation terminal 100 can control the display device 200. For example, the operation terminal 100 can control the reproduction of the signage content on the display device 200.

  Further, according to the present embodiment, the operation terminal 100 changes the setting of the display device 200. Note that the setting change control process A is performed as described above. Therefore, it is possible to cope with changes in information related to signage content reproduction, changes in information related to signage content settings, and the like.

  Further, according to the present embodiment, in steps S110 and S120, the detection unit 207 performs processing for detecting a data change by accessing the external memory M1. Therefore, it is possible to cope with changes in signage content, changes in various setting data, and the like by the operation terminal 100. Therefore, detection of change of signage content, change of various setting data, and the like by the operation terminal 100 can be automatically performed without understanding human hands.

  Further, according to the present embodiment, the above-described tuning change control process B is performed. Therefore, it is possible to cope with a change in channel selection using the operation terminal 100.

  Further, according to the present embodiment, the memory control unit 202 stores the operation Web application A1 in the external memory M1. The operation web application A1 is stored in the external memory M1 so that the operation terminal 100, which is an external terminal that performs wireless communication with the external memory M1, can refer to the operation web application A1 (setting data).

  Accordingly, the operation terminal 100 can refer to the operation Web application A1 (setting data), and the operation terminal 100 can perform reliable control on the display device 200.

  Further, according to the present embodiment, the operation Web application A1 that can be referred to by the operation terminal 100 is configured in HTML. Therefore, the operation terminal 100 can control the display device 200 using a standard Web browser without requiring a dedicated application. Under the control of the display device 200, for example, user-desired information can be displayed on the display device 200, or the display device 200 can reproduce the signage content desired by the user.

  In this embodiment, display device 200 does not need to have a wireless communication function. In order to provide the display device 200 with a wireless communication function, the display device 200 may be simply mounted with an external memory having a function of performing wireless communication.

  Therefore, at the time of initial introduction of the signage system 1000 that uses the display device 200, for example, it is possible to realize a minimum scale and inexpensive system construction. In addition, the signage system 1000 can easily be upgraded with a wireless communication function (network distribution function) in the future due to the above configuration of the display device 200. That is, in the present embodiment, a display device 200 for realizing such a signage system 1000 can be provided.

  In Related Technology A, as described above, a signage terminal having a communication function displays content received from a content distribution server via a network. Therefore, in Related Technology A, it is necessary to install a function for downloading content in a signage terminal via a network.

  Therefore, in the signage system using the related technology A, it is necessary to install a communication function in each signage terminal, and there is a problem that the cost of the signage system becomes expensive. Therefore, there are cases where a user who wants to reduce the initial cost of the signage system cannot complete the introduction of the signage system. For example, the signage system is configured so that the signage system is constructed with a small number of signage terminals on a trial basis without providing a communication function (network distribution function) for each signage terminal at the beginning of the signage system operation. is there.

  Further, as described above, the related art B can be applied to an apparatus that does not have a communication function. Therefore, the related technology B can solve the above-described problems of the related technology A. However, in the signage system using the related technology B, it is necessary to replace the signage system in the future when the signage system is configured to be able to distribute content via the network. Therefore, the signage system using the related technology B has a problem that a large amount of reinvestment is required.

  Therefore, since the present embodiment is configured as described above, it is possible to solve the above-described problems of Related Technology B.

(Other variations)
Although the display device according to the present invention has been described based on the embodiments, the present invention is not limited to these embodiments. The present invention also includes modifications made to the present embodiment by those skilled in the art without departing from the scope of the present invention. That is, in the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  For example, the display device 200 may not include all the components illustrated in FIG. That is, the display device 200 may include only the minimum components that can realize the effects of the present invention. For example, if the control unit 201 is configured to also perform processing performed by the memory control unit 202, the display device 200 may not include the memory control unit 202.

  In addition, the present invention may be realized as a data management method in which operations of characteristic components included in the display device 200 are used as steps. In the present invention, the computer may execute each step included in the data management method. Further, the present invention may be realized as a program that causes a computer to execute each step included in such a data management method. Further, the present invention may be realized as a computer-readable recording medium that stores such a program. The program may be distributed via a transmission medium such as the Internet.

  All the numerical values used in the above-mentioned embodiment are examples of numerical values for specifically explaining the present invention. That is, the present invention is not limited to the numerical values used in the above embodiments.

  The data management method according to the present invention corresponds to FIG. 5, FIG. 6, or FIG. The order of execution of each process in the data management method is an example for specifically explaining the present invention, and may be an order other than the above. Also, part of the processing in the data management method and other processing may be executed in parallel independently of each other.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  For example, in the above-described embodiment, the signage content playback is stopped immediately before the update process N. However, the signage content playback is continued immediately before the update process N (hereinafter referred to as “modified configuration A”). May also be referred to as “.”

  In the “modified configuration A”, for example, the processes in steps S130 and S160 do not have to be performed in FIG. 5, FIG. 6, or FIG.

  Further, for example, in the above embodiment, a change in the state of stored data (data change) is detected by referring to a register value. In the case of this configuration, it is necessary for the operation terminal 100 to add a special specification to the external memory M1 so that the register value of the external memory M1 can be changed. In a configuration in which a general-purpose memory card is used as the external memory M1, when data change is detected, a configuration in which the following data change detection processing A is performed (hereinafter also referred to as “modified configuration B”) may be employed.

  FIG. 9 is a flowchart of the data change detection process A. In the data change detection process A, first, the process of step S210 is performed.

  In step S210, the control unit 201 determines whether or not a predetermined time has elapsed from a predetermined timing. The fixed time is, for example, a preset time between 1 second and 60 seconds. When step S210 is performed for the first time, the predetermined timing is a timing at which the data change detection process A is disclosed. In the case where the first step S210 has already been performed, the predetermined timing is, for example, the timing at which the process of step S230 described later is completed.

  If YES in step S210, the process proceeds to step S220. On the other hand, if NO in step S210, the process of step S210 is performed again.

  In step S220, the control unit 201 performs an update process A. In the update process A, an unmount process and a mount process A are performed. First, unmount processing is performed. In the unmount process, the control unit 201 controls the memory control unit 202 so that communication between the memory control unit 202 and the external memory M1 is stopped. As a result, the external memory M1 is unmounted.

  In the mount process A, the control unit 201 analyzes and lists file information (directory entries) indicated by the file management information, which is management information, via the memory control unit 202, and reconstructs the file management information. . Thereby, the file management information is recreated (updated).

  If a change in the state of the stored data has occurred, the created (updated) file management information is different from the file management information generated (updated) when the previous step S220 was performed. . If no change in the state of the stored data has occurred, the created (updated) file management information is the same as the previous file management information created (updated). That is, the file management information may not be changed in the mount process A (update process A). That is, the file management information updated in the mount process A (update process A) may be the same as the file management information before being updated.

  Note that the mounting process A (update process A) performed in a situation where the state of the stored data has changed is the situation where the control unit 201 does not store the stored data from the outside in a situation where the stored data cannot be referred to from the outside. In this process, management information (file management information) is updated (recreated) so that data can be referred to.

  In addition, the control unit 201 transmits the created latest file management information to the detection unit 207. Then, the update process A ends.

  In the following, the file management information created (updated) by the n (natural number) -th update process A is also referred to as “file management information n”. Hereinafter, the file management information created (updated) by the (n + 1) th update process A is also referred to as “file management information (n + 1)”.

  In step S230, the detection unit 207 determines whether the file management information has changed by comparing the file management information n with the file management information (n + 1). When the process of step S230 is performed for the first time, the file management information n and the file management information (n + 1) do not exist, so the process of step S210 is performed again.

  The comparison between the file management information n and the file management information (n + 1) is, for example, a comparison between the number of files indicated by the file management information n and the number of files indicated by the file management information (n + 1). The file management information n and the file management information (n + 1) are compared by, for example, comparing the time stamp of each file indicated by the file management information n with the time stamp of each file indicated by the file management information (n + 1). is there.

  Specifically, the detection unit 207 determines whether the file management information (n + 1) is different from the file management information n. When the file management information (n + 1) is different from the file management information n, the detection unit 207 determines that the file management information has changed.

  If YES in step S230, the process proceeds to step S240. On the other hand, if NO in step S230, the process of step S210 is performed again.

  Thereby, the processes of steps S210 and S220 are repeated until it is determined as YES in step S230. Therefore, the control unit 201 periodically performs the update process A during a period in which the detection unit 207 does not detect a data change.

  In step S240, the detection unit 207 detects a data change.

  In steps S230 and S240, the detection unit 207 obtains the file management information n created (updated) by the nth update process A and the file management information (n + 1) updated by the (n + 1) th update process A. By comparing, the data change is detected.

  Through the data change detection process A described above, the detection unit 207 detects a data change.

  According to the modified configuration B (data change detection process A), the data change can be automatically detected. Therefore, detection of change of signage content, change of various setting data, and the like by the operation terminal 100 can be automatically performed without understanding human hands.

  100 operation terminal, 200 display device, 201 control unit, 202 memory control unit, 205 playback unit, 207 detection unit, 208 broadcast reception unit, 1000 signage system.

Claims (5)

A display device that communicates with an external memory having a function of performing wireless communication with the outside,
The external memory has a function of storing data including video content, a function of acquiring the video content from outside by wireless communication, and storing the acquired video content,
The display device
A detecting unit for detecting a data change that is a change in a state of stored data that is the data stored in the external memory by accessing the external memory;
A playback unit for playing back the video content stored in the external memory;
A control unit for performing an update process for updating management information for managing the stored data when the detection unit detects the data change ;
The display device is controlled based on control data for controlling the display device,
The display device further includes:
A broadcast receiving unit for receiving broadcast content;
The control data indicates information related to a transmission source of the broadcast content,
The external memory performs wireless communication with an external terminal,
The display device further includes:
A memory control unit that communicates with the external memory;
The external memory operates as a Web server,
The control unit generates an operation web application that displays a list of transmission sources of the broadcast content based on the control data,
The memory control unit stores the operation web application in the external memory,
Based on an operation on the external terminal that displays the operation Web application that displays the transmission source list acquired from the external memory, the broadcast receiving unit selects a transmission source for receiving the broadcast content. The display device to change . The control unit performs the update process of updating the management information so that the stored data can be referred to in a situation where the stored data cannot be referred to due to a change in the state of the stored data. The display device described in 1. 3. The playback unit according to claim 1, wherein the playback unit stops playback of the video content before the update process is performed, and plays back the video content that has been stopped after the update process is completed. Display device. The external memory includes a register indicating a value for indicating the data change when the data change occurs,
The detection unit, by referring to the value of the register, a display device according to any one of claims 1 to 3, detecting the data changes. The control unit periodically performs the update process during a period in which the detection unit does not detect the data change. The detection unit updates the management information updated by the n (natural number) update process. If, (n + 1) -th by comparing the management information updated by the updating process, the display device according to any one of claims 1 to 3, detecting the data changes.

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