JP6354343B2 - Display system - Google Patents

Description

  The present invention relates to a display system in which a display terminal displays information based on display data transmitted from a display control apparatus to the display terminal.

  A display system that includes a display control device and a display terminal, and a display system that displays information, for example, characters and images, based on display data transmitted from the display control device to the display terminal is known. Yes. In the display system, the display control device and the display terminal are connected by, for example, wireless communication, and information transmitted by the display control device is received by the display terminal through wireless communication (see, for example, Patent Document 1).

JP 2012-174013 A

  By the way, in the display system, one display data transmitted from the display control device to the display terminal is written in a plurality of continuous address spaces in the memory provided in the display terminal as viewed from the software provided in the display terminal. On the other hand, one piece of data written in this way is obtained by reading out the data written in each of a plurality of continuous address spaces in the order of addresses, so one display data transmitted by the display control device is Easily analyzed. Therefore, there is a need for a display system in which display data written on a display terminal is more difficult to analyze.

  An object of the present invention is to provide a display system in which display data can be made difficult to be analyzed in a display system in which the display terminal displays information based on display data transmitted from the display control device to the display terminal. .

  One aspect of the display system includes a display terminal including a terminal storage unit, and a display control device that transmits display data to the display terminal. The display control device divides the display data into a plurality of pieces of divided data, and randomly assigns an address in the terminal storage unit to each of the plurality of pieces of divided data so as to be different for each piece of the divided data. A data generation unit that generates transmission data including the address assigned to the divided data for each of the plurality of divided data, and the address assigned to each of the plurality of divided data is the divided data. And a device storage unit that stores the data in association with each other, and a command for causing the display terminal to restore the display data from a plurality of the divided data, and a command that is different every time a plurality of the divided data is generated. A command generating unit that generates based on the address stored in the memory, a plurality of the divided data, and the command And a transmission unit for transmitting. The display terminal includes a receiving unit that receives a plurality of the divided data and the command, the terminal storage unit that stores the divided data, and a plurality of pieces of information stored in the terminal storage unit that execute the command. A command processing unit for restoring the display data from the divided data.

  According to one aspect of the display system, the display data is divided into a plurality of divided data, and each of the plurality of divided data is an address randomly assigned by the display control device among the addresses of the terminal storage unit in the display terminal. Is remembered. Then, the display control device that stores the address assigned to each of the plurality of divided data generates a command for restoring the display data based on the address assigned by the display control device. Therefore, it is difficult to specify a plurality of pieces of divided data stored in the terminal storage unit, and even if a plurality of pieces of divided data are specified, display data can be restored simply by reading the plurality of pieces of divided data. Display data is difficult to analyze.

  In another aspect of the display system, the transmission unit includes a plurality of mutually different transmission terminals, and each of the plurality of transmission terminals is configured to transmit the transmission data by short-range wireless communication. Preferably, each of the plurality of transmitting terminals transmits the divided data different from each other.

  According to another aspect of the display system, each of the plurality of transmission terminals transmits different divided data, so that the display terminal is an image based on the display data only when the divided data is received from all the transmission terminals. Can be displayed in its entirety.

  In another aspect of the display system, the display data is first display data, the address is a first address, the divided data is first divided data, and the transmission data is first Transmission data. The data generation unit divides second data different from the first display data into a plurality of second divided data, and each of the plurality of second divided data includes the first address in the terminal storage unit. Different second addresses are randomly assigned to be different for each of the second divided data, and the second transmission data including the second divided data and the second address assigned to the second divided data are a plurality of the transmission data. Generated for each of the second divided data. It is preferable that the display terminal further includes a display unit that displays information based on the first divided data.

  According to another aspect of the display system, the terminal storage unit stores a plurality of first divided data at randomly assigned addresses, and further stores a plurality of second divided data at randomly assigned addresses. To do. Therefore, it is difficult for a falsifier who falsifies the second divided data to falsify only the second divided data, and when such a falsifier falsifies the second divided data, the first divided data is easily changed. Since the display terminal includes a display unit that displays information based on the first divided data, when the second divided data constituting the second data is falsified, the information displayed on the display terminal is Information that should be originally displayed is different. Therefore, whether or not the information displayed on the display unit based on the first divided data is the information that should be displayed is determined whether the first divided data has been changed. It is possible to detect whether or not tampering has occurred.

  In another aspect of the display system, a command transmission terminal is further provided. The command transmission terminal preferably includes a command reception unit that receives the command transmitted by the transmission unit, and a command transmission unit that transmits the command received by the command reception unit to the display terminal.

  According to another aspect of the display system, a command transmission terminal different from the display control device that generates the command transmits the command to the display terminal. Therefore, in order to display information based on the divided data stored in the display terminal on the display terminal, both the display terminal in which the divided data is stored and the command transmission terminal that transmits the command are necessary.

In another aspect of the display system, the terminal storage unit preferably stores dummy data at an address other than the address where the divided data is stored.
According to another aspect of the display system, since the terminal storage unit stores dummy data in addition to a plurality of divided data, which data among the data stored in the terminal storage unit is divided data. It becomes difficult to understand. Therefore, it becomes more difficult to restore the display data from the plurality of divided data, and as a result, the display data is hardly analyzed.

  According to the present invention, in the display system in which the display terminal displays information based on the display data transmitted from the display control apparatus to the display terminal, the display data is hardly analyzed.

1 is a system configuration diagram showing a schematic configuration of a display system in a first embodiment embodying the present invention. It is a block diagram which shows the electrical structure of the display control apparatus in 1st Embodiment. It is a data block diagram which shows typically the structure of the display data in 1st Embodiment, and the structure of transmission data. It is a block diagram which shows the electric constitution of the display terminal in 1st Embodiment. It is a memory block diagram which shows typically the several address space of the terminal memory | storage part in 1st Embodiment, and the information memorize | stored in each address space. It is a sequence chart which shows the order of the process in 1st Embodiment. It is a system block diagram which shows the typical structure of the display system in 2nd Embodiment which actualized this invention. It is a block diagram which shows the electric constitution of the command transmission terminal in 2nd Embodiment. It is a sequence chart which shows the order of the process in 2nd Embodiment. It is a sequence chart which shows a part of process in the modification of 2nd Embodiment in order. It is a sequence chart which shows a part of process in the modification of 2nd Embodiment in order. It is a system block diagram which shows the typical structure of the display system in 3rd Embodiment which actualized this invention. It is a block diagram which shows the electrical structure of the display control apparatus in 3rd Embodiment. It is a sequence chart which shows the order of the process in 3rd Embodiment. It is an effect | action figure for demonstrating the effect | action of 3rd Embodiment. It is an effect | action figure for demonstrating the effect | action of 3rd Embodiment. It is a data block diagram which shows typically each structure of 1st display data, 1st transmission data, 2nd data, and 2nd transmission data in 4th Embodiment which actualized this invention. It is a memory block diagram which shows typically the several address space of the terminal memory | storage part in 4th Embodiment, and the information memorize | stored in each address space. It is a memory block diagram which shows typically the state by which the information of the terminal memory | storage part in 4th Embodiment was tampered. It is a sequence chart which shows the order of the process in 4th Embodiment. It is an effect | action figure for demonstrating the effect | action in 4th Embodiment. It is an effect | action figure for demonstrating the effect | action in 4th Embodiment.

[First Embodiment]
A first embodiment in which the display system is embodied will be described with reference to FIGS. 1 to 6. Below, the structure of a display system, the component of a display system, and the process in a display system are demonstrated in order.

[Display system configuration]
The configuration of the display system will be described with reference to FIG.
As shown in FIG. 1, the display system 10 includes a display control device 11 and a display terminal 12. The display control device 11 transmits display data for displaying a predetermined image on the display terminal 12 to the display terminal 12, and the display terminal 12 includes a storage unit that stores the display data transmitted by the display control device 11. Yes. The display data is an example of first display data.

  In the display system 10, the display control device 11 and the display terminal 12 are connected by predetermined communication 13, for example, short-range wireless communication. The short-range wireless communication is, for example, NFC, and may be Bluetooth (registered trademark), IrDA, ZigBee (registered trademark), or the like, which is a short-range wireless communication other than NFC. Alternatively, the communication 13 is not limited to short-range wireless communication, but may be other communication such as wired communication.

  The display control device 11 is, for example, a personal computer, but may be a smartphone or the like, and may be any device that can transmit display data to the display terminal 12 by the communication 13 described above. Although the display terminal 12 is a display card, for example, a smart phone etc. may be sufficient as long as it has a memory | storage part for memorize | storing display data and can display display data.

  The information displayed on the display terminal based on the display data only needs to include at least one of characters and an image including a pattern or a figure, and these may be combined as appropriate. Further, the information may be a black and white display or a color display.

[Configuration of display control device]
The configuration of the display control apparatus will be described with reference to FIGS. In FIG. 3, the display transmission data is schematically shown for convenience of explaining the display transmission data.

  As shown in FIG. 2, the display control device 11 includes a device storage unit 21, a device control unit 22, and a transmission unit 23, and the device control unit 22 supplies electricity to each of the device storage unit 21 and the transmission unit 23. Connected.

  The device storage unit 21 stores at least data and a program that the device control unit 22 interprets and executes. The programs include, for example, a divided data generation program, an address designation program, a command generation program, and a data transmission program.

  The divided data generation program is a program for generating display divided data by dividing display data into a predetermined data size. The display division data is an example of first division data. By the divided data generation program, for example, one display data having a predetermined data size is smaller than the size of the display data itself, and one address space set in the terminal storage unit of the display terminal 12 Is divided into display-divided data of a size that can be stored in, for example, 1 byte.

  The address designating program is a program for associating each display division data with a display address which is one address in the terminal storage unit of the display terminal 12. According to the addressing program, for example, pseudorandom numbers are used, and one address is randomly associated with each of the plurality of display division data. The display address is an example of the first address, and the display address associated with each display division data is random as viewed from the software included in the display terminal 12.

  The command generation program is a program for generating a command for restoring one display data from a plurality of display division data based on an address associated with each display division data.

  The data transmission program is a program for causing the display terminal 12 to transmit the display transmission data including the display division data to which the display address is assigned to the transmission unit 23. The display transmission data is an example of first transmission data.

  The data stored in the device storage unit 21 includes display data for displaying information on the display terminal. Further, the data stored in the device storage unit 21 includes display address data in which addresses assigned to the respective display divided data are associated with each other in the order of arrangement of the display divided data in the display data. Yes. In the display address data, an address assigned to each of the plurality of divided data is associated with each divided data.

  The transmission unit 23 transmits display transmission data including one display division data and an address assigned to the display division data to the display terminal 12. The display transmission data is an example of first transmission data.

  The device control unit 22 includes a data generation unit 22a and a command generation unit 22b. The command generation unit 22b generates a command for restoring one display data from a plurality of display division data based on the command generation program and the address data. The command generation unit 22b generates a different command each time a plurality of display division data are generated, and the command generated by the command generation unit 22b is unique for each display address data.

  As shown in FIG. 3, the data generation unit 22 a generates a plurality of display transmission data 34 from one display data 31. For example, the data generation unit 22 a executes a divided data generation program and divides one display data 31 into a plurality of display divided data 32. Then, the data generation unit 22a executes an address designation program, and randomly assigns one display address 33 in the terminal storage unit to each display division data 32, whereby each of the plurality of display division data 32 is assigned. Display transmission data 34 is generated.

  At this time, the data generation unit 22 a stores the display address data in the device storage unit 21. The display address data includes a display address 33 assigned to the display divided data 32 and an arrangement order in the display data 31 of the display divided data 32 to which the display address 33 is assigned.

[Configuration of display terminal]
The configuration of the display terminal will be described with reference to FIG. 4 and FIG.
As shown in FIG. 4, the display terminal 12 includes a reception unit 41, a terminal control unit 42, a terminal storage unit 43, and a display unit 44. The terminal control unit 42 includes the reception unit 41, the terminal storage unit 43, and The display unit 44 is electrically connected. The receiving unit 41 receives a plurality of display transmission data 34 transmitted by the display control device 11 and a command for restoring the display division data 32 included in the display transmission data 34 to the display data 31.

  The terminal storage unit 43 stores at least data and a program that the terminal control unit 42 interprets and processes. Among these, the program includes, for example, a command processing program, and the command processing program executes the command received by the receiving unit 41 to restore one display data 31 from the plurality of display division data 32. It is a program for. The data includes a plurality of display division data 32 received by the receiving unit 41.

  The terminal control unit 42 includes a command processing unit 42a, and the command processing unit 42a executes a command processing program and interprets a command received from the display control device 11. Then, the command processing unit 42 a arranges the plurality of display division data 32 stored in the terminal storage unit 43 according to the arrangement order in the display data 31 and restores one display data 31.

  The display unit 44 displays predetermined information based on the display data 31 restored by the terminal control unit 42. The display unit 44 is, for example, electronic paper, but may be another display such as an organic EL display or a plasma display.

  The display terminal 12 is preferably configured so as not to have an internal power supply. In such a configuration, the display terminal 12 is configured to supply power necessary for the display terminal 12 by communication 13 with the display control device 11. That's fine.

  FIG. 5 is a diagram schematically illustrating the terminal storage unit 43, and is a diagram schematically illustrating a plurality of address spaces partitioned in the terminal storage unit 43. In FIG. 5, for convenience of explanation, each address space is hatched with dots or the like.

  As shown in FIG. 5, the display division data 32 included in each display transmission data 34 is stored in one address space of the terminal storage unit 43 according to one display address 33 assigned to the display division data 32. The In the following, the display address 33 is represented in a form in which row numbers and column numbers corresponding to the address space are arranged in order.

  For example, when the display address 33 included in the display transmission data 34 is “10”, the display division data 32 is stored in the first address space 43 a associated with “10” and included in the display transmission data 34. When the display address 33 is “32”, the display division data 32 is stored in the second address space 43b associated with “32”.

  When the display address 33 included in the display transmission data 34 is “63”, the display division data 32 is stored in the third address space 43 c associated with “63” and is included in the display transmission data 34. When the display address 33 is “92”, the display division data 32 is stored in the fourth address space 43d associated with “92”.

  When the display address 33 included in the display transmission data 34 is “A1”, the display division data 32 is stored in the fifth address space 43e associated with “A1” and included in the display transmission data 34. When the display address 33 is “D3”, the display division data 32 is stored in the sixth address space 43f associated with “D3”.

In the terminal storage unit 43, dummy data, which is data that does not constitute the display data 31, is stored in an address space in which the display division data 32 is not stored.
In the display terminal 12, for example, once the display data 31 is restored, dummy data is stored in the entire address space of the terminal storage unit 43. Alternatively, when the display terminal 12 receives a plurality of new display division data 32, dummy data is stored in the entire address space.

[Display system processing]
Processing executed by the display system will be described with reference to FIG.
As shown in FIG. 6, the display control device 11 transmits a connection request signal within a predetermined range from the display control device 11 (step S <b> 11), and the display terminal 12 is located within the predetermined range of the display control device 11. The display terminal 12 receives the connection request signal (step S12), and transmits a connection response signal corresponding to the received connection request signal (step S13). At this time, the connection response signal includes information for specifying the display terminal 12, for example, the ID of the display terminal 12.

  The display control apparatus 11 receives the connection response signal, and the display control apparatus 11 authenticates the display terminal 12 as the terminal to which the display transmission data 34 should be transmitted from the ID of the display terminal 12 (step S14). And the display control apparatus 11 produces | generates the display transmission data 34 based on the display data 31 (step S15), and transmits the display transmission data 34 to the display terminal 12 (step S16). Next, the display terminal 12 receives the display transmission data 34 (step S17), and stores the display division data 32 in the address space for each display transmission data 34 (step S18).

  The display control device 11 generates a command for restoring the display data 31 from the display division data 32 included in the display transmission data 34 following the transmission of the display transmission data 34 to the display terminal 12 (step S19). ).

  When the display control device 11 executes the command generation program to generate a command, for example, the command generation program displays on the display unit of the display control device 11 an option as to whether or not to transmit the command to the display terminal 12. Is done. Then, in the display control device 11, for example, when transmission of a command is selected by the user, the display control device 11 transmits a command for restoring display data to the display terminal 12 (step S20).

  The display terminal 12 receives the command transmitted from the display control device 11 (step S21), executes the command, and restores one display data 31 from the plurality of display division data 32 (step S22). Thereby, the display part 44 displays the information based on the display data 31 (step S23).

  In step S11 to step S23, for example, the owner of the display terminal 12 holds the display terminal 12 over the reader / writer serving as the transmission unit 23 of the display control device 11, so that the reader / writer and the display terminal 12 are connected. The distance is kept within a predetermined distance. Thereby, communication 13 by NFC is possible between the display terminal 12 and the display control device 11.

  In order to make it difficult to analyze the display data, the display terminal 12 writes the display data transmitted from the display control device 11 in an irregular address space for each data size that can be written in one address space. A configuration is also possible.

  However, in such a configuration, when the function for determining the arrangement of display data is embodied by software, the arrangement of display data divided and stored is analyzed by analysis of the software stored in the display terminal 12. End up.

  Moreover, even when embodied in hardware, analysis of the display data and analysis of the display data arranged in order may be performed by analyzing the display terminal. Furthermore, when the function for determining the arrangement of display data is implemented by hardware, it is also necessary to develop dedicated hardware for determining the arrangement of display data.

  On the other hand, according to the display system 10 described above, it is difficult to specify a plurality of display division data 32 stored in the terminal storage unit 43, and even if a plurality of display division data 32 is specified. It is difficult to restore the display data 31 by simply reading the plurality of display division data 32. Furthermore, since the display terminal 12 does not have a function of determining the arrangement of the display data 31, the arrangement of the display data 31 is not easily specified.

As described above, according to the display system of the first embodiment, the effects listed below can be obtained.
(1) The display data 31 is divided into a plurality of display division data 32, and each of the plurality of division 32 data is randomly assigned by the display control device 11 in the address of the terminal storage unit 43 in the display terminal 12. Stored in the address space. Then, the display control device 11 that stores the display addresses 33 assigned to the plurality of display division data 32 generates a command for restoring the display data 31 based on the addresses assigned by the display control device 11. Therefore, it is difficult to specify the display division data 32 stored in the terminal storage unit 43, and even if a plurality of display division data 32 is specified, simply reading the plurality of display division data 32 is not necessary. Since it is difficult to restore the display data 31, the display data 31 is difficult to analyze.

  (2) Since the terminal storage unit 43 stores dummy data in addition to the plurality of display division data 32, which data among the data stored in the terminal storage unit 43 is the display division data 32. It becomes difficult to understand. Therefore, it becomes more difficult to restore the display data 31 from the plurality of display division data 32, and as a result, the display data 31 is hardly analyzed.

The first embodiment described above can be implemented with appropriate modifications as follows.
The terminal storage unit 43 may not store dummy data. Even in such a configuration, as viewed from the software of the display terminal 12, a plurality of display division data 32 are randomly stored in a plurality of address spaces, and the plurality of display division data 32 are combined into one display data 31. If the display control device 11 generates a command for restoration, the effect according to the above (1) can be obtained.

  The display control device 11 does not have to perform authentication of the display terminal 12 based on the data included in the display control device 11. For example, the display control device 11 uses the received ID of the display terminal 12 to authenticate the display terminal 12. It may be performed by the server that has transmitted the ID to the display terminal 12 and transmitted to a server that is an external device for performing the above.

  When the communication 13 between the display control device 11 and the display terminal 12 is not NFC but a predetermined network such as the Internet, for example, when the processing from step S11 to step S23 is executed, the display control device 11 and the display terminal The distance to the terminal 12 may not be within a predetermined distance. In short, any state is acceptable as long as communication between the display control device 11 and the display terminal 12 is possible.

[Second Embodiment]
A second embodiment in which the display system is embodied will be described with reference to FIGS. The display system according to the second embodiment is different from the display system according to the first embodiment in a device that transmits a command for restoring display data to the display terminal. For this reason, in the following, such differences will be described in detail, and in the display system of the second embodiment, the same reference numerals as those of the display system of the first embodiment are assigned to the configurations common to the display system of the first embodiment. Accordingly, the description of the configuration common to the display system of the first embodiment is omitted. Moreover, below, the structure of a display system, the structure of a command transmission terminal, and the process of a display system are demonstrated in order.

[Display system configuration]
The configuration of the display system will be described with reference to FIG.
As shown in FIG. 7, the display system 10 includes a display control device 11 and a display terminal 12, and further includes a command transmission terminal 51. The command transmission terminal 51 receives the command transmitted from the display control apparatus 11 through the communication 13 described above, and transmits the received command to the display terminal 12.

  The command transmission terminal 51 is, for example, a smartphone, but may be a personal computer or the like, and is a terminal that can receive a command transmitted from the display control device 11 through the communication 13 described above and can transmit a command to the display terminal 12. I just need it.

[Configuration of command sending terminal]
The configuration of the command transmission terminal will be described with reference to FIG.
As shown in FIG. 8, the command transmission terminal 51 includes a command reception unit 61, a command control unit 62, a command storage unit 63, and a command transmission unit 64. The command control unit 62 includes a command reception unit 61, a command storage unit. The unit 63 and the command transmission unit 64 are electrically connected.

  The command receiving unit 61 receives a command transmitted from the display control device 11 and used to restore a plurality of display division data 32 stored in the terminal storage unit 43 of the display terminal 12 to one display data 31. To do. On the other hand, the command transmission unit 64 transmits the command received by the command reception unit 61 to the display terminal 12.

  The command storage unit 63 stores at least a command and a program that the command control unit 62 interprets and executes. Among these programs, for example, a transmission control program and a reception control program are included. These programs are executed by the command control unit 62 to cause the command reception unit 61 to receive a command and the command transmission unit 64 to transmit a command.

  The command control unit 62 interprets and executes the transmission control program and the reception control program, thereby causing the command reception unit 61 to receive a command and causing the command transmission unit 64 to transmit the command.

[Display system processing]
Processing executed by the display system will be described with reference to FIG.
As shown in FIG. 9, the display control device 11 transmits a connection request signal within a predetermined range from the display control device 11 (step S <b> 31), and the display terminal 12 is positioned within the predetermined range of the display control device 11. When the display terminal 12 receives the connection request signal (step S32), the display terminal 12 transmits a connection response signal corresponding to the received connection request signal (step S33). At this time, the connection response signal includes information for specifying the display terminal 12, for example, the ID of the display terminal 12.

  The display control device 11 receives the connection response signal, and the display control device 11 authenticates that the display terminal 12 is a terminal to which the display transmission data 34 should be transmitted from the ID of the display terminal 12 (step S34). And the display control apparatus 11 produces | generates the display transmission data 34 based on the display data 31 (step S35), and transmits the display transmission data 34 to the display terminal 12 (step S36). Next, the display terminal 12 receives the display transmission data 34 (step S37), and stores the display division data 32 in the address space for each display transmission data 34 (step S38).

  In step S31 to step S38, for example, the owner of the display terminal 12 holds the display terminal 12 over the reader / writer of the display control device 11, and the distance between the reader / writer and the display terminal 12 is within a predetermined distance. It keeps in.

  Further, following the transmission of the display transmission data 34 to the display terminal 12, the display control device 11 generates a command for restoring the display data 31 from the display division data 32 included in the display transmission data 34 (step S39). ).

  On the other hand, when the command transmission terminal 51 transmits a connection request signal (step S40) and the command transmission terminal 51 is located within a predetermined range of the display control device 11, the display control device 11 receives the connection request signal ( Step S41). The connection request signal transmitted from the command transmission terminal 51 includes information for specifying the command transmission terminal 51, for example, the ID of the command transmission terminal 51.

  When the command transmission terminal 51 authenticates as a terminal to which a command should be transmitted from the ID of the command transmission terminal 51, the display control device 11 transmits a connection response signal and a command to the command transmission terminal 51 (step S42). Then, the command transmission terminal 51 receives the command (step S43).

  In step S40 to step S43, for example, the owner of the command transmission terminal 51 holds the command transmission terminal 51 over the reader / writer of the display control apparatus 11, and sets the distance between the reader / writer and the command transmission terminal 51 to a predetermined value. Keep within the distance.

  The command transmission terminal 51 transmits a connection request signal (step S44), and when the display terminal 12 is located within a predetermined range of the command transmission terminal 51, the display terminal 12 receives the connection request signal (step S45). Then, the display terminal 12 transmits a connection response signal to the command transmission terminal 51 (step S46). At this time, the ID of the display terminal 12 is included in the connection response signal.

  When the command transmission terminal 51 receives the connection response signal (step S47) and the command transmission terminal 51 authenticates as the terminal to which the display terminal 12 should transmit a command from the ID of the display terminal 12, the command transmission terminal 51 displays the display terminal. The command is transmitted to 12 (step S48).

  The display terminal 12 receives the command transmitted from the command transmission terminal 51 (step S49), executes the command, and restores one display data from the plurality of display division data 32 (step S50). Thereby, the display part 44 displays the information based on the display data 31 (step S51).

  In step S44 to step S49, for example, the same person has the display terminal 12 and the command transmission terminal 51, and the owner holds the display terminal 12 over the command transmission terminal 51, so that the display terminal 12 and the command transmission terminal 51 The distance to the transmission terminal 51 is kept within a predetermined distance.

As described above, according to the display system of the second embodiment, the following effects can be obtained.
(3) A command transmission terminal 51 different from the display control device 11 that generates a command transmits a command to the display terminal 12. Therefore, in order to display information based on the display division data 32 stored in the display terminal 12 on the display terminal 12, the display terminal 12 in which the display division data 32 is stored and the command transmission terminal 51 that transmits a command are used. Both are necessary.

Note that the second embodiment described above can be implemented with appropriate modifications as follows.
When the information displayed on the display terminal 12 is information for authentication, for example, the display system 10 may execute the process shown in FIG. 10 after the process executed in step S47 described above. Good.

  That is, as shown in FIG. 10, the command transmission terminal 51 transmits a command, and the display terminal 12 restores the display data 31 by executing the received command and displays information (from step S48 to step S51). Next, the command transmission terminal 51 captures the information displayed on the display terminal 12 by, for example, a camera included in the command transmission terminal 51 (step S52), and the command transmission terminal 51 performs display control of image data corresponding to the captured image. It transmits to the apparatus 11 (step S53). Note that the command transmission terminal 51 may transmit the image data to the display control device 11 by the above-described short-range wireless communication, or may transmit the image data by another communication method.

  Then, the display control device 11 receives the image data (step S54), and performs image data authentication processing, for example, by collating with the image data stored in the display control device 11 (step S55). The display control device 11 transmits the authentication result to the command transmission terminal 51, and the command transmission terminal 51 receives the authentication result transmitted from the display control device 11 (step S56 and step S57).

  -In addition, in the modification demonstrated using FIG. 10, the display control apparatus 11 is authenticating by the information displayed on the display terminal 12. FIG. Not limited to this, an apparatus other than the display control apparatus 11, for example, the authentication server S may perform image authentication.

  For example, as shown in FIG. 11, the command transmission terminal 51 transmits a command, and the display terminal 12 restores the display data 31 by executing the received command and displays information (from step S48 to step S51). Next, the command transmission terminal 51 captures information displayed on the display terminal 12 by, for example, a camera (step S58), and the command transmission terminal 51 transmits image data corresponding to the captured image to the authentication server S ( Step S59). Note that the command transmission terminal 51 may transmit image data to the authentication server S via a predetermined communication network.

  The authentication server S receives the image data (step S60), and performs image data authentication processing, for example, by collating with the image data stored in the authentication server S (step S61). The authentication server S transmits the authentication result to the command transmission terminal 51, and the command transmission terminal 51 receives the authentication result transmitted from the authentication server S (step S62 and step S63).

  The process from step S40 to step S42 may be a process described below. That is, the command transmission terminal 51 is connected to a predetermined website via the Internet, and a website in which the ID of the command transmission terminal 51 is registered in advance. Then, the command transmission terminal 51 transmits the ID to the website, and the ID is transmitted from the website to the authentication server, whereby the authentication process of the command transmission terminal 51 is performed.

  When the command transmission terminal 51 is authenticated by the authentication server, information regarding that the command transmission terminal 51 is a terminal to which a command is to be transmitted is transmitted from the authentication server to the display control device 11. The display control device 11 stores the ID of the command transmission terminal 51 as the ID of the terminal that should transmit the command.

  When the display control device 11 stores the ID of the command transmission terminal 51, the display control device 11 notifies the authentication server that the storage of the ID is completed. Upon receiving the completion notification, the authentication server displays information such as “Please hold it over the display control device 11” or “Please make communication with the display control device 11 ready” on the above-mentioned website. Let

  Next, when the distance between the command transmission terminal 51 and the display control device 11 is within a predetermined distance, the display control device 11 authenticates the command transmission terminal 51, and the display control device 11 sends a command to the command transmission terminal 51. Send.

-The display system 10 of 2nd Embodiment can also be implemented in combination with the structure of the modification of 1st Embodiment.
[Third Embodiment]
A third embodiment in which the display system is embodied will be described with reference to FIGS. The display system of the third embodiment differs from the display system of the second embodiment in the configuration of the display control device. For this reason, in the following, such differences will be described in detail, and in the display system of the third embodiment, the same reference numerals as those of the display system of the second embodiment are assigned to the configurations common to the display system of the second embodiment. Accordingly, the description of the configuration common to the display system of the second embodiment is omitted. In the following, the configuration of the display system, the configuration of the display control device, the processing of the display system, the operation of the display system, and the use of the display system will be described in order.

[Display system configuration]
The configuration of the display system will be described with reference to FIG.
As shown in FIG. 12, the display system 10 includes a display control device 70, a display terminal 12, and a command transmission terminal 51. The display control device 70 includes one generation terminal 71 and a plurality of data transmission terminals 72. Each of the plurality of data transmission terminals 72 is an example of a transmission terminal. In FIG. 12, a configuration including four data transmission terminals 72 is illustrated, but the number of data transmission terminals 72 included in the display control device 70 may be two or more. For example, the display control device 70 The number of transmission data generated by 70 may be the same.

  The generation terminal 71 generates a plurality of display transmission data 34 and outputs each of the plurality of display transmission data 34 to different data transmission terminals 72. For example, the generation terminal 71 outputs one display division data 32 to one data transmission terminal 72. If the display division data 32 output to each data transmission terminal 72 is different from each other, a plurality of pieces of data are generated. The display division data 32 may be output. The generation terminal 71 generates a command for restoring one display data 31 from the plurality of display division data 32.

The generation terminal 71 is, for example, a personal computer, but may be another device capable of generating transmission data and a command.
Each data transmission terminal 72 is configured to transmit the display transmission data 34 by the short-range wireless communication 73, and the plurality of data transmission terminals 72 are arranged at different locations. The plurality of data transmission terminals 72 transmit different display transmission data 34, that is, different display division data 32 to the display terminal 12. Each data transmission terminal 72 is, for example, a reader / writer connected to the generation terminal 71, but may be a personal computer, a smartphone, or the like, and can transmit the display transmission data 34 to the display terminal 12 by the short-range wireless communication 73. Any terminal can be used.

The short-range wireless communication is 73, for example, NFC, but may be Bluetooth (registered trademark), IrDA, ZigBee (registered trademark), or the like.
The command transmission terminal 51 transmits the command generated by the display control device 11 to the display terminal 12 by the short-range wireless communication 73. The command transmission terminal 51 is, for example, a reader / writer connected to the generation terminal 71, but may be a smartphone or a personal computer, and is a terminal that can transmit a command to the display terminal 12 by the short-range wireless communication 73. I just need it. Note that the command transmission terminal 51 of the third embodiment differs from the command transmission terminal 51 of the second embodiment in that the command generated by the generation terminal 71 is stored in the command storage unit 63 in advance.

[Configuration of display control device]
The configuration of the display control apparatus will be described with reference to FIG.
As illustrated in FIG. 13, the display control device 70 includes a generation terminal 71 and a plurality of data transmission terminals 72, and the generation terminal 71 includes a device storage unit 81 and a device control unit 82.

  Similar to the device storage unit 21 of the first embodiment, the device storage unit 81 stores at least data and a program. The program includes a divided data generation program, an address designation program, and a command generation program. It is.

  The data includes display data and display address data, which is data in which addresses assigned to each display division data are associated with each other in the order of display division data in the display data.

  Similar to the device control unit 22 of the first embodiment, the device control unit 82 includes a data generation unit 82a and a command generation unit 82b. The data generation unit 82 a generates a plurality of display transmission data 34 from one display data 31, and the command generation unit 82 b generates a command for restoring one display data 31 from the plurality of display division data 32.

  Each of the data transmission terminals 72 includes a transmission unit 72a and a transmission terminal storage unit 72b. The transmission unit 72a transmits the display transmission data 34 to the display terminal 12 as in the transmission unit 23 of the first embodiment. In the transmission terminal storage unit 72b, display divided data 32 that is different for each data transmission terminal 72 is stored in advance.

[Display system processing]
Processing executed by the display system will be described with reference to FIG. Note that, in the plurality of data transmission terminals 72, the processes executed by the data transmission terminals 72 are common to each other. Therefore, only two data transmission terminals 72 among the four data transmission terminals 72 will be described below.

  In the display system 10, the generation terminal 71 included in the display control device 70 executes the divided data generation program and the address specification program described above to generate a plurality of display transmission data 34 from one display data 31. Then, the generation terminal 71 outputs each of the plurality of display transmission data 34 to different data transmission terminals 72. Each data transmission terminal 72 stores one of the display transmission data 34 output from the generation terminal 71 in the transmission terminal storage unit 72b.

  On the other hand, the generation terminal 71 generates a command by executing a command generation program and outputs the command to the command transmission terminal 51. The command transmission terminal 51 stores the command output from the generation terminal 71 in the command storage unit 63.

  As shown in FIG. 14, among the four data transmission terminals 72, the first data transmission terminal 72, which is one data transmission terminal 72, sends a connection request signal within a predetermined distance from the first data transmission terminal 72. Transmit (step S71). When the display terminal 12 is located within a predetermined range of the first data transmission terminal 72, the display terminal 12 receives the connection request signal (step S72) and transmits a connection response signal corresponding to the received connection request signal. (Step S73). At this time, the connection request signal includes information for specifying the display terminal 12, for example, the ID of the display terminal 12.

  The first data transmission terminal 72 receives the connection response signal, and the first data transmission terminal 72 authenticates from the ID of the display terminal 12 that the display terminal 12 is a terminal to which the display transmission data 34 should be transmitted (step) S74). Note that the first data transmission terminal 72 may authenticate the display terminal 12 based on information stored in the transmission terminal storage unit 72b, or output the ID of the display terminal 12 to the generation terminal 71, for example. Thus, the generation terminal 71 may authenticate the display terminal 12.

  The first data transmission terminal 72 transmits one display transmission data 34 stored in the transmission terminal storage unit 72b to the display terminal 12 (step S75). The display terminal 12 receives the display transmission data 34 (step S76), and stores the display division data 32 in the address space corresponding to the address included in the display transmission data 34 (step S77).

  In step S71 to step S77, for example, the owner of the display terminal 12 holds the display terminal 12 over the first data transmission terminal 72, and the distance between the first data transmission terminal 72 and the display terminal 12 is reached. Is kept within a predetermined distance.

  Then, among the four data transmission terminals 72, the second data transmission terminal 72 different from the previous data transmission terminal 72 transmits a connection request signal within a predetermined distance from the second data transmission terminal 72 (step). S78). When the display terminal 12 is located within a predetermined distance of the second data transmission terminal 72, the display terminal 12 receives the connection request signal (step S79) and transmits a connection response signal corresponding to the received connection request signal. (Step S80). At this time, as in step S73 described above, the connection response signal includes an ID for specifying the display terminal 12.

  The second data transmission terminal 72 receives the connection response signal, and the second data transmission terminal 72 authenticates from the ID of the display terminal 12 that the display terminal 12 is a terminal to which the display transmission data 34 should be transmitted (step) S81). In addition, the 2nd data transmission terminal 72 authenticates the display terminal 12 by the same method as the 1st data transmission terminal 72, for example.

  The second data transmission terminal 72 displays one display transmission data 34 stored in the transmission terminal storage unit 72b and is different from the display transmission data 34 transmitted by the first data transmission terminal 72. (Step S82). The display terminal 12 receives the display transmission data 34 (step S83), is the display address 33 included in the display transmission data 34, and is included in the display transmission data 34 transmitted by the first data transmission terminal 72. The display division data 32 is stored in an address space corresponding to an address different from the use address 33 (step S84).

  In step S78 to step S84, for example, the owner of the display terminal 12 moves from the location where the first data transmission terminal 72 is located to the location where the second data transmission terminal 72 is located, The display terminal 12 is held over the second data transmission terminal 72. As a result, the holder keeps the distance between the second data transmission terminal 72 and the display terminal 12 within a predetermined distance.

The display terminal 12 exchanges the above-described signals and data with both the third data transmission terminal 72 and the fourth data transmission terminal 72.
Next, the command transmission terminal 51 transmits a connection request signal within a predetermined distance from the command transmission terminal 51 (step S85). When the display terminal 12 is located within a predetermined distance of the command transmission terminal 51, the display terminal 12 receives the connection request signal (step S86) and transmits a connection response signal corresponding to the received connection request signal (step S86). S87). At this time, as in step S73 described above, the connection response signal includes an ID for specifying the display terminal 12.

  The command transmission terminal 51 receives the connection response signal, and the command transmission terminal 51 authenticates from the ID of the display terminal 12 that the display terminal 12 is a terminal to which a command should be transmitted (step S88). The command transmission terminal 51 authenticates the display terminal 12 by the same method as the first data transmission terminal 72, for example.

  The command transmission terminal 51 transmits the command stored in the command storage unit 63 to the display terminal 12 (step S89). The display terminal 12 receives the command (step S90), and restores one display data 31 from the plurality of display division data 32 by executing the command (step S91). Then, the display unit 44 displays an image based on the display data 31 (step S92).

  In addition, before the process of step S85 to step S92 is performed, for example, the owner of the display terminal 12 changes the location where the third data transmission terminal 72 is arranged from the location where the second data transmission terminal 72 is arranged. Move to. Then, the holder holds the display terminal 12 over the third data transmission terminal 72 and causes the display terminal 12 to store the display division data 32 included in the display transmission data 34 of the third data transmission terminal 72.

  Next, the owner moves from the place where the third data transmission terminal 72 is arranged to the place where the fourth data transmission terminal 72 is arranged. Then, the holder holds the display terminal 12 over the fourth data transmission terminal 72 and causes the display terminal 12 to store the display division data 32 included in the display transmission data 34 of the fourth data transmission terminal 72.

  Thereafter, the owner moves from the place where the fourth data transmission terminal 72 is arranged to the place where the command transmission terminal 51 is arranged. In step S85 to step S92, the owner of the display terminal 12 holds the display terminal 12 over the command transmission terminal 51 and keeps the distance between the command transmission terminal 51 and the display terminal 12 within a predetermined distance. Yes.

[Operation of display system]
The operation of the display system will be described with reference to FIGS. Hereinafter, an example in which the display data 31 is data for displaying, for example, a predetermined image will be described.

  As shown in FIG. 15, the display terminal 12 receives each of the different display transmission data 34 transmitted from the first data transmission terminal 72 to each of the fourth data transmission terminals 72, and the command transmission terminal When the command 51 to be transmitted is received, the image P is displayed on the display unit 44.

  The image P includes, for example, a first portion P1, a second portion P2, a third portion P3, and a fourth portion. The display division data 32 included in the display transmission data 34 transmitted from the first data transmission terminal 72 corresponds to the first portion P1, and the display included in the display transmission data 34 transmitted from the second data transmission terminal 72. The divided data 32 corresponds to the second portion P2. The display division data 32 included in the display transmission data 34 transmitted from the third data transmission terminal 72 corresponds to the third portion P3, and the display included in the display transmission data 34 transmitted from the fourth data transmission terminal 72. The divided data 32 corresponds to the fourth portion P4.

  Therefore, for example, a command for restoring the display data 31 is executed in the display terminal 12 in a state where the display terminal 12 has not received at least one of the display transmission data 34 transmitted by each data transmission terminal 72. Then, the display unit 44 displays the image P from which at least a part of the image P is missing. Therefore, by displaying the image P on the display terminal 12, whether the display terminal 12 has received the display transmission data 34 from all the data transmission terminals 72, and from which data transmission terminal 72 the display terminal 12 displays It is possible to detect whether the transmission data 34 has not been received.

  Such detection based on the image P may be performed by, for example, a person such as the owner of the display terminal 12, or, for example, data regarding the image P may be a server as an external device of the display control device 11 or the display system 10. May be performed by the display control device 11 or the server.

  For example, as shown in FIG. 16, when the image P displayed on the display terminal 12 has the first part P1, the second part P2, and the fourth part P4, but does not have the third part P3, It can be detected that the display terminal 12 has not received the display transmission data 34 transmitted by the third data transmission terminal 72.

Thus, the display terminal 12 can display the entire image based on the display data 31 only when the display division data 32 is received from all the data transmission terminals 72.
[Use of display system]
The display system 10 described above is applied to, for example, a stamp rally. In this case, each of the plurality of data transmission terminals 72 included in the display control device 11 is arranged at a checkpoint which is a place different from each other and where a stamp rally participant should stop.

  For example, a participant in the stamp rally has the display terminal 12 and holds the display terminal 12 over each of the plurality of data transmission terminals 72 arranged at different check points. Accordingly, the display divided data 32 for each data transmission terminal 72 is stored in the terminal storage unit 43 of the display terminal 12. Then, when the participant holds the display terminal 12 over a command transmission terminal 51 arranged at a place different from the place where each of the plurality of data transmission terminals 72 is arranged, for example, at the goal of the stamp rally, the display terminal 12, information based on the display data 31 restored from the plurality of display division data 32 is displayed. Therefore, the information displayed on the display terminal 12 makes it possible to grasp whether or not the participant has stopped at all places where the participant should stop by the stamp rally.

  Alternatively, the display system 10 is applied to process management for managing a process for manufacturing a predetermined article. For example, in the case of an article manufactured through processing in each of a plurality of processes, one data transmission terminal 72 is arranged and completed at a place where each of the processes performed until the article is manufactured is completed. The command transmission terminal 51 is arranged at the place where the article is arranged. Then, the display terminal 12 is transported to the place where each manufacturing process is performed together with the article subjected to the predetermined processing in each manufacturing process, and the display terminal 12 completes the processing for the article in each manufacturing process. Every time it is done, it may be held over the data transmission terminal 72 arranged at a place where each manufacturing process is performed.

  Thereby, the display terminal 12 stores one display division data 32 every time the manufacturing process is completed, and after all the manufacturing processes are completed, a command is transmitted and information is displayed on the display unit 44. Is done. Therefore, it is possible to grasp whether or not all of the processes of the plurality of manufacturing processes have been performed on the article based on the information displayed on the display terminal 12.

As described above, according to the display system of the third embodiment, the following effects can be obtained.
(4) Since each of the plurality of data transmission terminals 72 transmits different display division data 32, the display terminal 12 displays the display data 31 only when the display division data 32 is received from all the data transmission terminals 72. The entire image based on the can be displayed.

Note that the third embodiment described above can be implemented with appropriate modifications as follows.
Each of the plurality of data transmission terminals 72 may not include the transmission terminal storage unit 72b, and may include only the transmission unit 72a. In such a configuration, for example, the generation terminal 71 may authenticate whether or not the display terminal 12 is a terminal that should transmit the display transmission data 34 and the command. Each time the generation terminal 71 authenticates the display terminal 12, the display transmission data 34 that is different for each data transmission terminal 72 is output to the data transmission terminal 72, and the data transmission terminal 72 performs display transmission to the display terminal 12. Data 34 may be transmitted.

  A configuration in which no information is displayed on the display unit 44 even when a command is executed when a part of the display divided data 32 is not stored in the terminal storage unit 43 may be used. Even with such a configuration, it is possible to obtain the effect according to the above-described (4).

-The display system 10 of 3rd Embodiment can also be implemented in combination with each structure of the modification of 2nd Embodiment.
[Fourth Embodiment]
A fourth embodiment in which the display system is embodied will be described with reference to FIGS. 17 to 22. The display system of the fourth embodiment differs from the display system of the first embodiment in the data that the display control device transmits to the display terminal. Therefore, in the following, such differences will be described in detail. On the other hand, in the display system according to the fourth embodiment, the same reference numerals as those of the display system according to the first embodiment are assigned to the components common to the display system according to the first embodiment. Accordingly, the description of the configuration common to the display system of the first embodiment is omitted. Moreover, below, the transmission data which a display control apparatus transmits to a display terminal, the structure of a terminal memory | storage part, the process of a display system, and the effect | action of a display system are demonstrated in order.

[Transmission data]
The transmission data will be described with reference to FIG. In FIG. 17, the transmission data is schematically shown for convenience in explaining the transmission data. In the following, data and programs stored in the device storage unit 21 of the display control device 11 together with transmission data will be described.

  As shown in FIG. 17, in the display system 10 of the fourth embodiment, the device storage unit 21 of the display control device 11 stores at least data and a program, and the data includes the display data 31 in the first embodiment. In addition, detection target data 91 that is data to be detected as to whether or not data has been tampered with is included. The detection target data 91 is not data for displaying information such as an image, but is information such as an ID used for authentication of the display terminal 12 or highly confidential information, for example. That is, the display terminal 12 has a function as a portable memory for carrying, for example, authentication information, text data for forming a predetermined program, and the like. The detection target data 91 is an example of second data.

  The programs include a divided data generation program, an address designation program, a command generation program, and a data transmission program. Of these, the divided data generation program generates a plurality of display divided data 32 from the display data 31 and also divides the detection target data 91 into predetermined pieces of information to obtain one piece of detection target data. 91 is a program for generating a plurality of detection division data 92 from 91. The detection division data 92 is an example of second division data.

  According to the divided data generation program, the detection target data 91 having a predetermined size is smaller than the data size of the detection target data 91 and is stored in one address space set in the terminal storage unit 43 of the display terminal 12. It is divided into detection division data of a size that can be stored, for example, 1 byte.

  The addressing program associates each display division data 32 with one display address 33 in the terminal storage unit 43 of the display terminal 12, and each detection division data 92 has one in the terminal storage unit 43 of the display terminal 12. This is a program for associating the detection address 93 which is an address. According to the addressing program, for example, a pseudo-random number is used, and one address is randomly assigned to each of the plurality of display division data 32 and each of the plurality of detection division data 92. The display address 33 assigned to the display division data 32 and the detection address 93 assigned to the detection division data 92 are different from each other. The detection address 93 is an example of a second address, and the detection address associated with each detection division data is random as viewed from the software included in the display terminal 12.

  The data transmission program sends the display transmission data 34 including the display division data 32 to which the display address 33 is assigned and the detection transmission data 94 including the detection division data 92 to which the detection address 93 is assigned to the display terminal 12. On the other hand, it is a program for causing the transmitter 23 to transmit. The detected transmission data 94 is an example of second transmission data.

  The data generation unit 22a of the device control unit 22 executes a divided data generation program, divides one display data 31 into a plurality of display divided data 32, and a single detection target data 91 as a plurality of detection divisions. The data 92 is divided. Then, the data generation unit 22a executes an address designation program, randomly assigns one display address 33 to each display division data 32, and randomly assigns one detection address 93 to each detection division data 92. Assign to.

  Thus, the data generation unit 22a generates a plurality of display transmission data 34 including one display division data 32 and one display address 33 for each display division data 32, and one detection division data 92. And a plurality of detection transmission data 94 including one detection address 93 is generated for each detection division data 92.

  At this time, the data generation unit 22 a stores the display address data and the detection address data in the device storage unit 21. The detection address data includes a detection address 93 assigned to the detection division data 92 and an arrangement order in the detection target data 91 of the detection division data 92 to which the detection address 93 is assigned.

[Configuration of terminal storage unit]
The configuration of the terminal storage unit will be described with reference to FIGS. 18 and 19. 18 and 19 are diagrams schematically showing a plurality of address spaces partitioned in the terminal storage unit 43. In FIG. 18 and FIG. 19, hatching of dots or the like is provided in each address space for convenience of explanation. Is attached.

  As shown in FIG. 18, the display division data 32 included in each display transmission data 34 is stored in any one of the first address space 43a to the sixth address space 43f. On the other hand, when the detection target data 91 is divided into, for example, six detection division data 92, each of the plurality of detection division data 92 is one address space different from each other among the following six address spaces. Is remembered. In the following, the detection address 93 is represented in a form in which row numbers and column numbers associated with the address space are arranged in order, like the display address 33.

  For example, when the detection address 93 included in the detection transmission data 94 is “04”, the detection division data 92 is stored in the seventh address space 43g associated with “04” and included in the detection transmission data 94. When the detection address 93 is “24”, the detection division data 92 is stored in the eighth address space 43h associated with “24”.

  When the detection address 93 included in the detection transmission data 94 is “70”, the detection division data 92 is stored in the ninth address space 43 i associated with “70”, and the detection division data 92 is included in the detection transmission data 94. When the use address 93 is “B4”, the detection divided data 92 is stored in the tenth address space 43j associated with “B4”.

  When the detection address 93 included in the detection transmission data 94 is “D0”, the detection division data 92 is stored in the eleventh address space 43k associated with “D0” and included in the detection transmission data 94. When the detection address 93 is “F4”, the detection divided data 92 is stored in the twelfth address space 431 associated with “F4”.

  In the terminal storage unit 43, dummy data, which is data that does not constitute either the display data 31 or the detection target data 91, is stored in an address space in which the display division data 32 and the detection division data 92 are not stored. .

  FIG. 19 shows that after a plurality of display division data 32 and a plurality of detection division data 92 are stored in the storage area of the terminal storage unit 43, a part of the data stored in each address space is a third party. An example of the state where it was falsified by is shown typically.

  As shown in FIG. 19, in the terminal storage unit 43, the address space associated with each address from “03” to “F3” and the address associated with each address from “04” to “F4”. Data stored in the address space is altered by a third party. In this case, the tampered data includes the display division data 32 stored in the third address space 43c and the display division data 32 stored in the sixth address space 43f. The tampered data includes the detection division data 92 stored in the seventh address space 43g, the detection division data 92 stored in the eighth address space 43h, the tenth address space 43j, and the twelfth address space 43l. Stored detection division data 92 is included.

  As described above, the terminal storage unit 43 stores a plurality of display division data 32 in a randomly assigned address space and a plurality of detection division data 92 in the same randomly assigned address space. Therefore, it is difficult for a falsifier who falsifies the detection divided data 92 to falsify only the detection divided data 92, and when such a falsifier falsifies the detection divided data 92, the display divided data 32 is easily changed. . As a result, a part of the plurality of display division data 32 and a part of the plurality of detection division data 92 are falsified by third party falsification.

[Display system processing]
Processing executed by the display system will be described with reference to FIG. In the following, an example will be described in which the data described with reference to FIG. 19 among the data transmitted from the display control device 11 to the display terminal 12 is falsified by a third party.

  As illustrated in FIG. 20, the display control device 11 transmits a connection request signal within a predetermined range from the display control device 11 (step S <b> 101), and the display terminal 12 is located within the predetermined range of the display control device 11. The display terminal 12 receives the connection request signal (step S102), and transmits a connection response signal corresponding to the received connection request signal (step S103). At this time, the connection response signal includes information for specifying the display terminal 12, for example, the ID of the display terminal 12.

  The display control device 11 receives the connection response signal, and the display control device 11 authenticates the ID of the display terminal 12 from the ID of the display terminal 12 as a terminal to which the display transmission data 34 and the detection transmission data 94 are to be transmitted. (Step S104). Then, the display control device 11 generates display transmission data 34 based on the display data 31 and detection transmission data 94 based on the detection target data 91 (step S105), and displays the display transmission data 34 and the detection transmission data 94 on the display terminal. 12 (step S106). The display terminal 12 receives the display transmission data 34 and the detection transmission data 94 (step S107), stores the display division data 32 in the address space for each display transmission data 34, and stores the display divided data 32 in the address space for each detection transmission data 94. The detection division data 92 is stored (step S108).

  The display control device 11 generates a command for restoring the display data 31 from the display division data 32 included in the display transmission data 34 following the transmission of the display transmission data 34 to the display terminal 12 (step S109). ).

  In step S101 to step S108, for example, the owner of the display terminal 12 holds the display terminal 12 over the reader / writer of the display control device 11, and the distance between the reader / writer and the display terminal 12 is within a predetermined distance. It keeps in.

  Here, for example, when the display terminal 12 leaves the owner's hand and is mailed, the data stored in the display terminal 12 is falsified by the falsifier (step S110), whereby the display terminal 12 A part of the data stored in is modified (step S111).

  Next, the display control device 11 transmits a connection request signal within a predetermined range from the display control device 11 (step S112), and when the display terminal 12 is located within the predetermined range of the display control device 11, the display terminal 12 Receives the connection request signal (step S113). Then, the display terminal 12 transmits a connection response signal corresponding to the received connection request signal (step S114). At this time, for example, the ID of the display terminal 12 is included in the connection response signal as described above.

  Whether or not the display control device 11 receives the connection response signal, and the display control device 11 is the display terminal 12 that has transmitted the display transmission data 34 and the detection transmission data 94 from the ID of the display terminal 12. Is determined (step S115). When the display control device 11 determines that the display terminal 12 is a terminal that has received the display transmission data 34 and the detection transmission data 94, the display control device 11 transmits a command to the display terminal 12 (step S116). .

  The display terminal 12 receives the command transmitted from the display control device 11 (step S117), executes the command, and restores one display data 31 from the plurality of display division data 32 (step S118). Thereby, the display part 44 displays the information based on the display data 31 (step S119).

  In step S112 to step S119, for example, the owner of the display terminal 12 holds the display terminal 12 over the reader / writer of the display control apparatus 11, and the distance between the reader / writer and the display terminal 12 is within a predetermined distance. It keeps in.

[Operation of display system]
The operation of the display system will be described with reference to FIGS. 21 and 22. Hereinafter, an example in which the display data 31 is data for displaying, for example, a predetermined image will be described.

  As shown in FIG. 21, for example, the display unit 44 displays the image P based on the display data 31. For example, when the display data 31 includes six display division data 32, each display data 31 includes a first portion P1, a second portion P2, a third portion P3, a fourth portion P4, and a fifth portion in the image P. The data corresponds to one of the part P5 and the sixth part P6.

  After the display terminal 12 stores the display division data 32 and the detection division data 92, if the display division data 32 is not falsified, the image P based on the display data 31 restored from the display division data 32 is the first portion P1. To the sixth portion P6 in a state having all of the sixth portion P6.

  On the other hand, as shown in FIG. 22, when the image P displayed on the display unit 44 does not have, for example, the third part P3 and the sixth part P6, the third of the display divided data 32 is displayed. It can be detected that the data corresponding to the portion P3 and the data corresponding to the sixth portion P6 have been altered. Then, by detecting that part of the display divided data 32 has been altered, it is detected that there is a high possibility that the detected divided data 92 stored in the terminal storage unit 43 together with the display divided data 32 is falsified. can do.

  As described above, the display division data 32 is stored in the terminal storage unit 43 together with the detection division data 92, so that the image P based on the display division data 32 is displayed on the display unit 44. It becomes possible to detect the presence or absence of tampering. Therefore, it is possible to detect whether the detection divided data 92 is falsified without the detection target data 91 itself being data for displaying information or without analyzing the detection divided data 92 itself.

  Such tampering detection based on the image P may be performed by, for example, a person such as the owner of the display terminal 12. For example, data regarding the image P may be used as an external device of the display control device 11 or the display system 10. May be performed by the display control device 11 or the server.

As described above, according to the display system of the fourth embodiment, the following effects can be obtained.
(5) The terminal storage unit 43 stores a plurality of display division data 32 at randomly assigned addresses, and further stores a plurality of detection division data 92 at randomly assigned addresses. Therefore, it is difficult for a falsifier who falsifies the detection divided data 92 to falsify only the detection divided data 92. When such a falsifier falsifies the detection divided data 92, the display divided data 32 is easily changed. And since the display terminal 12 is provided with the display part 44 which displays the image based on the display division data 32, when the detection division data 92 which comprises the detection object data 91 is falsified, it is displayed on the display terminal 12. The image P is different from the image P to be originally displayed. Therefore, whether or not the display division data 32 is changed depending on whether or not the image P displayed on the display unit 44 based on the display division data 32 is the image P to be originally displayed is detected. It can be detected whether the data 92 has been tampered with.

Note that the above-described fourth embodiment can be implemented with appropriate modifications as follows.
The device storage unit 21 may not store the detection address data. In such a configuration, for example, a terminal other than the display control device 11 may store the detection address data.

  The display control device 11 may generate a command for restoring the detection target data 91 from the detection divided data 92 in addition to the command for restoring the display data 31 from the display divided data 32. In such a configuration, for example, the command processing unit 42 a interprets a command for restoring the detection target data 91, and arranges a plurality of detection division data 92 according to the arrangement order in the detection target data 91 to restore one detection target data.

  A configuration in which no information is displayed on the display unit 44 even when a command is executed when a part of the display divided data 32 is modified may be used. Even with such a configuration, it is possible to obtain the effect according to the above-described (5).

-The display system 10 of 4th Embodiment can also be implemented with each structure and combination of the modification of 1st Embodiment.
-The display system 10 of 4th Embodiment can also be implemented in combination with the structure of 2nd Embodiment. That is, the display system 10 may be configured to include the command transmission terminal 51 in addition to the display control device 11 and the display terminal 12.

-The display system 10 of 4th Embodiment can also be implemented in combination with each structure of the modification of 2nd Embodiment.
The detection target data 91 may be data for displaying a predetermined image.

  DESCRIPTION OF SYMBOLS 10 ... Display system, 11, 70 ... Display control apparatus, 12 ... Display terminal, 13 ... Communication, 21, 81 ... Device storage part, 22, 82 ... Device control part, 22a, 82a ... Data generation part, 22b, 82b ... Command generation unit, 23 ... transmission unit, 31 ... display data, 32 ... display division data, 33 ... display address, 34 ... display transmission data, 41 ... reception unit, 42 ... terminal control unit, 42a ... command processing unit, 43 Terminal storage unit 43a ... first address space 43b ... second address space 43c ... third address space 43d ... fourth address space 43e ... fifth address space 43f ... sixth address space 43g ... first 7 address space, 43h ... 8th address space, 43i ... 9th address space, 43j ... 10th address space, 43k ... 11th address space, 43l ... 12th address Space, 44 ... Display section, 51 ... Command transmission terminal, 61 ... Command reception section, 62 ... Command control section, 63 ... Command storage section, 64 ... Command transmission section, 71 ... Generation terminal, 72 ... Data transmission terminal, 73 ... Short-range wireless communication, 91 ... detection target data, 92 ... detection division data, 93 ... detection address, 94 ... detection transmission data, P ... image, P1 ... first part, P2 ... second part, P3 ... third part , P4 ... Fourth part.

Claims (4)

A display terminal comprising a terminal storage unit;
A display control device for transmitting display data to the display terminal;
A command transmission terminal, and
The display control device includes:
The display data is divided into a plurality of divided data, and an address in the terminal storage unit is randomly assigned to each of the plurality of divided data so as to be different for each of the divided data, and is assigned to the divided data and the divided data. A data generation unit that generates transmission data including the address for each of the plurality of divided data;
A device storage unit that stores the address assigned to each of the plurality of divided data in association with the divided data;
A command for generating a command for causing the display terminal to restore the display data from a plurality of the divided data based on the address stored in the device storage unit as a different command each time a plurality of the divided data is generated A generator,
A transmitter that transmits a plurality of the transmission data and the command,
The display terminal is
A receiving unit that receives a plurality of the transmission data and the command;
The terminal storage unit for storing the divided data;
A command processing unit that executes the command and restores the display data from a plurality of the divided data stored in the terminal storage unit ,
The command transmission terminal is
A command receiver for receiving the command transmitted by the transmitter;
And a command transmission unit configured to transmit the command received by the command reception unit to the display terminal . The transmission unit includes a plurality of transmission terminals different from each other, and each of the plurality of transmission terminals is configured to transmit the transmission data to the display terminal by short-range wireless communication, and is arranged at different locations. And
The display system according to claim 1, wherein each of the plurality of transmission terminals transmits the transmission data different from each other. The display data is first display data,
The address is a first address;
The divided data is first divided data,
The transmission data is first transmission data,
The data generator is
The second data different from the first display data is divided into a plurality of second divided data, and a second address different from the first address in the terminal storage unit is assigned to each of the plurality of second divided data. Randomly assigning differently for each second divided data, and second transmission data including the second divided data and the second address assigned to the second divided data, each of the plurality of second divided data Generated against
The transmitter transmits the second transmission data to the display terminal;
The receiving unit receives the second transmission data transmitted by the transmitting unit;
The terminal storage unit stores the second divided data included in the second transmission data received by the receiving unit,
The display system according to claim 1, wherein the display terminal further includes a display unit that displays information based on the first divided data. The terminal storage unit
The display system according to any one of claims 1 to 3 , wherein dummy data is stored in an address other than the address where the divided data is stored.

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