JP2010183151A - Display terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display terminal determining whether it operates as a master unit or a slave unit in accordance with a situation. <P>SOLUTION: When synchronization start processing is executed, a display terminal of a communicable master unit is retrieved (S21). Whether the display terminal of a master unit exists is determined (S22). When it is determined that the display terminal of a master unit exists (S22: YES), slave unit operation processing which is processing for causing itself to operate as a slave unit is executed (S23), and the synchronization start processing is finished. When it is determined the display terminal of a master unit does not exist (S22: NO), master unit operation processing which is processing for causing itself to operate as a master unit is executed (S24). Then, the synchronization start processing is finished. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display terminal, and more particularly to a display terminal that determines whether to become a parent device or a child device depending on the situation.

  2. Description of the Related Art Conventionally, portable devices have been known in which one of a plurality of terminals is used as a parent device and the other terminals are used as child devices, and characters and images displayed on the parent device are similarly displayed on the child devices (eg, patent Reference 1). In the portable device described in Patent Document 1, the parent device and the child device are connected to each other with a connection cable, and characters and image information displayed on the parent device are transmitted to the child device. The slave unit receives character and image information received from the master unit. Thereby, the same image as the image displayed on the parent device can be displayed in synchronization with the child device.

JP-A-6-110416

  However, in the portable device described above, since the control means for controlling various hardware such as the external storage device is different between the parent device and the child device, the parent device and the child device are determined in advance. There was a problem.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a display terminal that determines whether to become a parent device or a child device depending on the situation.

  To achieve the above object, in the display terminal according to the first aspect of the present invention, display means, storage means for storing display data to be displayed on the display means, and display control for causing the display means to display the display data. A display terminal comprising: a communication means for performing wireless communication with another display terminal; and start of synchronization of display contents displayed on the display means between the other display terminal A first instruction means for instructing, a first instruction determining means for determining whether or not an instruction is given by the first instruction means, and when it is judged that an instruction is given by the first instruction judging means, It is determined whether or not another display terminal that operates in the operation mode of the master mode indicating that the display terminal is the display terminal that transmits the display data to the display terminal is within the communication range of the communication unit. First judging means to When it is determined by the first determining means that there is no other display terminal in the parent device mode, its own operation mode is set to the parent device mode, and the other display terminal in the parent device mode is set. Mode setting means for setting its own operation mode to a handset mode indicating that it is the display terminal on the side receiving the display data from the other display terminal, and the mode setting Communication state setting means for setting the communication state of itself to a standby state, which is a state of waiting for the start of communication with the display terminal in the slave mode, Identification information transmitting means for transmitting identification information for identifying itself via the communication means to the display terminal in the parent device mode when the slave mode is set by the mode setting means; and the communication Condition In the standby state, the second determination means for determining whether or not the identification information transmitted by the identification information transmission means has been received, and the second determination means in the master mode If it is determined that the identification information has been received from the display terminal in the slave mode, the display data displayed on the display means is stored in the slave mode specified by the received identification information. The first transmission means for transmitting to the display terminal, and the display transmitted from the first transmission means of the display terminal in another base mode when set to the slave mode by the mode setting means First display means for receiving data, wherein the display control means causes the display means to display the display data received by the first reception means in the slave mode. The

  In addition to the configuration of the invention described in claim 1, the display terminal of the invention according to claim 2 has the identification information from the display terminal in the slave device mode by the second determination means in the master device mode. Information for specifying the display data displayed on the display terminal in the handset mode on the display terminal in the handset mode specified by the received identification information. Second transmission means for transmitting certain specific information, and information for requesting the display terminal in the parent device mode to receive the display data to be displayed on the display terminal in the child device mode in the parent device mode. Second receiving means for receiving request information from the display terminal in the slave mode, and the first transmitting means displays the request information on the display means when the second receiving means receives the request information. Is The display data are, and transmits to the display terminal of the handset mode that sent the request information.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect of the present invention, a storage control means for storing the display data received by the first receiving means in the storage means, In the slave mode, the specific information transmitted by the second transmitter is received by the third receiver for receiving from the display terminal in the master mode and the specific information received by the third receiver. Storage determination means for determining whether or not the specified display data is stored in the storage means, and the display data specified by the specific information by the storage determination means is stored in the storage means. If it is determined that the request information is not present, the third transmission means for transmitting the request information to the display terminal in the parent device mode, and the display control means, in the child device mode, the storage determining means, Is stored in the storage means, the display data stored in the storage means is displayed on the display means, and the display data is stored in the storage means by the storage determination means. If it is determined that the display data is not displayed, the display data received by the first receiving means is displayed on the display means.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the display terminal receives the display data from the display terminal in the master mode in the slave mode. A second instruction means for instructing to perform the operation and a second instruction determination means for determining whether or not an instruction has been given by the second instruction means, and the identification information transmitting means is provided by the mode setting means. When the slave mode is set and it is determined that the second instruction determination unit has instructed, the identification information is transmitted to the display terminal in the master mode.

  In addition to the configuration of the invention according to any one of claims 1 to 4, the display terminal of the invention according to claim 5 is the display of the slave mode specified by the identification information in the master mode. Third instruction means for instructing the terminal to transmit the display data displayed on the display means, and third instruction determination means for determining whether or not an instruction is given by the third instruction means In the master mode, the first transmission means determines that the second determination means has received the identification information from the display terminal in the slave mode, and the third instruction determination means gives an instruction. If it is determined, the display data displayed on the display means is transmitted to the display terminal in the slave mode specified by the received identification information.

  In addition to the configuration of the invention according to any one of claims 1 to 5, the display terminal of the invention according to claim 6 has its own display device at a predetermined timing when the communication state is the standby state. The first communication for changing the communication state from the standby state to a standby end state in which the standby state is ended and communication with the display terminal in the slave mode is not newly started. State change means is provided.

  According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect of the present invention, the predetermined timing is the display terminal in which the display data is the slave mode in the first transmission means. It is the timing which was transmitted to.

  According to an eighth aspect of the present invention, in addition to the configuration of the sixth aspect of the invention, a predetermined time has elapsed since the communication state was set to the standby state by the communication state setting means. Time determining means for determining whether or not the predetermined time is the timing at which the predetermined time has been determined by the time determining means.

  In addition to the configuration of the invention according to any one of claims 1 to 8, the display terminal of the invention according to claim 9 is instructed again by the first instruction determination means in the slave mode. When it is determined, it comprises mode change means for changing its own operation mode to a normal mode indicating that the display terminal does not communicate with the display terminal in the master mode.

  According to a tenth aspect of the present invention, in addition to the configuration of the invention according to any of the sixth to eighth aspects, the communication state is changed to the standby end state by the first communication state changing means. After that, when it is determined again that the first instruction determination unit has instructed, the second communication state changing unit changes the own communication state to the standby state.

  In the display terminal according to the first aspect of the present invention, if communication with another display terminal for which the control operation is accepted by the first judging means is impossible, the operation mode is transferred to other display terminals. Set to the master mode that is the sending side. Then, the communication state is set to a standby state that is a state of waiting for the start of communication with the display terminal in the slave mode. Further, if communication with another display terminal for which a control operation is accepted is possible, its own operation mode is set to a slave mode that is a side that receives data from the other display terminal. In the standby state, if it is determined by the second determination means that communication with the display terminal in the slave mode is possible, the data displayed on the display means is transmitted to the display terminal in the slave mode. In the slave mode display terminal to which the data has been transmitted, the first receiving means receives the data and displays the received data on the display means. As a result, whether to operate in the parent device mode or the child device mode can be easily determined at the timing when the control operation is accepted, and the data displayed on the display terminal operating in the parent device mode Can be displayed on a display terminal operating in the slave mode. Further, since the control operation is common to the display terminal in the parent device mode and the display terminal in the child device mode, the user does not need to learn a plurality of operations.

  In the display terminal of the invention according to claim 2, in addition to the effect of the invention of claim 1, the display terminal in the parent device mode specifies specific information for specifying the display data displayed on the display unit. Transmit by two transmission means. The request information is received by the second receiving means from the display terminal in the slave mode. When the request information is received, the display data displayed on the display unit is transmitted to the slave mode display terminal that transmitted the request information. Thereby, the display terminal in the parent device mode transmits the display data only to the display terminal in the child device mode that transmitted the request information. As a result, data is not unnecessarily transmitted to the display terminal in the slave mode.

  Further, in the display terminal of the invention according to claim 3, in addition to the effect of the invention of claim 2, the display terminal in the slave unit mode is specified by the memory determination means transmitted from the display terminal in the master unit mode. It is determined whether data specified by the information is stored. If it is determined that the data is not stored, request information for requesting reception of data is transmitted to the display terminal in the master mode. When it is determined that the data specified by the specific information is not stored by the storage determination unit, the display control unit displays the data transmitted from the display terminal in the master mode on the display unit, and displays the data in the storage determination unit. If it is determined that the data specified by the specific information is stored, the stored data is displayed on the display means. Thereby, when the data specified by specific information is memorize | stored in the display terminal of the subunit | mobile_unit mode, the display terminal of the main | base station mode can prevent transmitting unnecessary data. As a result, the display speed of data can be improved on the display terminal in the slave mode.

  In addition, in the display terminal of the invention according to claim 4, in addition to the effect of the invention of any one of claims 1 to 3, an instruction to receive display data from the display terminal in the master unit mode is given in the slave unit mode. A second instruction determination is made to determine whether or not Then, when an instruction is given in the second instruction determination, the identification information transmitting means transmits identification information for identifying itself to the display terminal in the master mode. Thereby, the user who uses the display terminal in the slave unit mode can decide to receive data from the display terminal in the master unit mode. As a result, it is possible to prevent display data from being received and displayed from the display terminal in the parent device mode in a situation unintended by the user using the display device in the child device mode.

  Further, in the display terminal of the invention according to claim 5, in addition to the effect of the invention of any one of claims 1 to 4, the display terminal of the slave unit mode specified by the received identification information is displayed in the display terminal of the master unit mode. Third instruction determining means for determining whether or not an instruction to transmit the display data displayed on the display unit has been given to the display terminal. When it is determined that the instruction is given by the third instruction determination means, the display data is transmitted to the display terminal in the slave mode specified by the received identification information. Thereby, the user who uses the display terminal of the parent device can select the display terminal of the child device with which communication is performed. As a result, it is possible to prevent display data from being transmitted to a display terminal in an unintended handset mode.

  Further, in the display terminal of the invention according to claim 6, in addition to the effect of the invention of any one of claims 1 to 5, when the communication state of the display terminal operating in the parent device mode is a standby state, a predetermined The second communication state changing means for changing to the standby end state at the timing is provided. Thereby, in the display terminal in the parent device mode, when a predetermined timing comes, communication connection with the display terminal in another child device mode is not accepted. As a result, it is possible to prevent communication with the display terminal in the slave mode more than necessary.

  In the display terminal of the invention according to claim 7, in addition to the effect of the invention of claim 6, the predetermined timing is a timing at which data is transmitted to the display terminal in the slave mode by the first transmission means. is there. Thereby, data is transmitted only from the display terminal in the parent device mode to the display terminal in the child device mode to which data is first transmitted. As a result, one-to-one communication between the display terminal in the parent device mode and the display terminal in the child device mode is possible, and data can be transmitted only to the display terminal in the specific child device mode.

  Further, in the display terminal of the invention according to claim 8, in addition to the effect of the invention of claim 6, has a predetermined time elapsed since the communication state was changed to the standby state by the first communication state changing means? Time judging means for judging whether or not is provided. The predetermined timing is the timing at which the predetermined time has been determined by the time determination means. Thus, until a predetermined time elapses, the display terminal in the parent device mode can communicate with the plurality of display devices in the child device mode and can transmit data.

  In the display terminal according to the ninth aspect of the invention, in addition to the effect of the invention according to any one of the first to eighth aspects, the control operation is received again by the operation receiving means at the display terminal in the slave mode. If it is, change its mode to the normal mode. Thereby, the communication connection with the display terminal in the parent device mode can be easily canceled by performing the control operation on the display terminal in the child device mode. Further, since the operation for connecting to the display terminal in the parent device mode and the operation for releasing the connection are the same operation, the user of the display terminal in the child device mode does not need to learn a plurality of operations.

  Further, in the display terminal of the invention according to claim 10, in addition to the effect of the invention according to any of claims 6 to 8, after the communication state is changed to the standby end state by the second communication state change unit, When the control operation is accepted again by the operation accepting means, a third communication state changing means for changing its own communication state to a standby state is provided. As a result, when a control operation is performed on the display terminal in the parent device mode in a state in which communication with another display terminal is not accepted, communication with another display terminal is accepted. As a result, in a state where a meeting or the like is being performed, even if communication with a display terminal in another slave mode is not accepted, by performing a control operation on the display terminal in the master mode, Communication between another display terminal used by a person who is late for the meeting and the display terminal in the master mode becomes possible. Then, it is possible to transmit data to be displayed on the display terminal used by the delayed person.

It is a figure which shows one specific example of the connection form of the display terminal. 3 is a plan view of the display terminal 100. FIG. 3 is a block diagram showing an electrical configuration of the display terminal 100. FIG. 3 is a schematic diagram showing a configuration of an EEPROM 104 of the display terminal 100. FIG. This is a main process of the display terminal 100. 4 is a flowchart of a synchronization start process subroutine executed by the display terminal 100. 5 is a flowchart of a sub-unit operation process subroutine executed by display terminal 100. 4 is a flowchart of a communication connection processing subroutine executed by the display terminal 100. 4 is a flowchart of a sub-unit operation processing subroutine executed by the display terminal 100. It is a flowchart of the subroutine of the communication connection process performed with the display terminal 100 of a 1st modification. It is a flowchart of the subroutine of the communication connection process performed with the display terminal 100 of a 2nd modification. It is a flowchart of the subroutine of the subunit | mobile_unit operation | movement process performed with the display terminal 100 of a 2nd modification. It is a flowchart of the subroutine of the communication connection process performed with the display terminal 100 of a 3rd modification. It is a flowchart of the subroutine of the communication connection process performed with the display terminal 100 of a 4th modification. It is a flowchart of the main process performed with the display terminal 100 of a 5th modification. It is a flowchart of the subroutine of the synchronous control process performed with the display terminal 100 of a 5th modification. It is a flowchart of the subroutine of the subunit | mobile_unit operation | movement process performed with the display terminal 100 of a 6th modification. It is a top view of the display terminal 100 of the 7th modification.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. The drawings to be referred to are used for explaining the technical features that can be adopted by the present invention, and the configuration of the apparatus and the flowcharts of various processes described are not intended to be limited thereto. This is just an illustrative example.

  First, the configuration of the display terminal 100 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating a specific example of a connection form of the display terminal 100. FIG. 2 is a plan view of the display terminal 100. FIG. 3 is a block diagram showing an electrical configuration of the display terminal 100. FIG. 4 is a schematic diagram showing the configuration of the EEPROM 104 of the display terminal 100. As an example, the display terminal 100 can be a PDA, an electronic book, a mobile phone, or the like.

  First, the connection form of the display terminal 100 will be described with reference to FIG. In the display terminal 100, a plurality of display terminals 100 can communicate with each other via the network 1, and the single display terminal 100 performs communication as a parent device that is a data transmission side. Then, the other display terminal 100 communicates as a slave unit that receives data from the display terminal 100 of the master unit. Here, the communication is assumed to be one-way communication from the display terminal 100 of the parent device to the display terminal 100 of the child device. Note that there is no problem even if there are a plurality of display terminals 100 of the slave units. As a communication method, it is only necessary to be able to communicate in a small area such as a small conference room. For example, infrared communication, Bluetooth (registered trademark), Zigbee (registered trademark), or the like can be used. In this embodiment, it is assumed that wireless communication based on Bluetooth capable of communication within a predetermined distance is performed.

  Next, the external appearance of the display terminal 100 will be described with reference to FIG. Here, in FIG. 2, the upper side of the paper surface is “upper side” of the display terminal 100, the lower side of the paper surface is “lower”, the right side of the paper surface is “right side”, and the left side of the paper surface is “left side”. Also, the front side of the page is the “front side” of the display terminal 100, and the back side of the page is the “back side” of the display terminal 100.

  As shown in FIG. 2, the display terminal 100 is formed in a substantially rectangular shape in plan view. A display unit 107 and an input unit 108 are provided on the front side of the display terminal 100. The display unit 107 is formed in a rectangular shape in plan view in which the vertical direction is longer than the horizontal direction, and is provided on the left side of the front side center. The display unit 107 includes a display element that can form a desired image. A conventionally known display element can be used as the display element. For example, a liquid crystal display element, an organic EL element, and an electrophoretic display element can be used.

  The input unit 108 includes a synchronization button 121, a determination button 122, and a cross button 123, and is provided on the right side of the front side center. And the input from a user is received. The synchronization button 121 is a button for controlling communication between the display terminals 100, and the determination button 122 is a button used for determining a desired operation or displaying a menu screen. It is. The cross button 123 is a button used when selecting an item on the menu screen.

  Next, the electrical configuration of the display terminal 100 will be described with reference to the block diagram of FIG. As shown in FIG. 3, the display terminal 100 includes a CPU 101 that controls the display terminal 100. A ROM 102, a RAM 103, an EEPROM 104, a counter 105, a display control unit 106, an input unit 108, a timing device 109, a power supply control unit 110, and a wireless communication control unit 112 are connected to the CPU 101 via a bus 120. A display unit 107 is connected via the display control unit 106. A battery 111 attached to the display terminal 100 is connected via the power control unit 110. In addition, a wireless communication unit 113 that communicates with other display terminals 100 is connected via the wireless communication control unit 112.

  The ROM 102 stores a program for operating the display terminal 100, and the RAM 103 temporarily stores various variables. The EEPROM 104 is a nonvolatile memory. The counter 105 measures time as a timer function. The display control unit 106 controls the display of images, text, and the like displayed on the display unit 107. The input unit 108 receives input from the user. In the time measuring device 109, time is measured as an internal clock. In addition, the power control unit 110 controls the battery 111 connected to the display terminal 100. The wireless communication control unit 112 controls the wireless communication unit 113 that performs communication with other display terminals 100.

  Next, the configuration of the EEPROM 104 will be described with reference to FIG. The EEPROM 104 is provided with various storage areas such as a data storage area 1101, a program storage area 1102, and a program related information storage area 1103.

  Data to be displayed on the display unit 107 of the display terminal 100 is stored in the data storage area 1101. The program storage area 1102 stores various programs executed on the display terminal 100. The program related information storage area 1103 stores information such as settings, initial values, and data necessary for program execution.

  Next, each process of the display terminal 100 will be described with reference to FIGS. FIG. 5 shows main processing of the display terminal 100. FIG. 6 is a flowchart of a subroutine of synchronization start processing executed on the display terminal 100. FIG. 7 is a flowchart of a sub-unit operation process subroutine executed on the display terminal 100. FIG. 8 is a flowchart of a communication connection processing subroutine executed by the display terminal 100. FIG. 9 is a flowchart of a sub-unit operation processing subroutine executed by the display terminal 100.

  First, the main process of the display terminal 100 will be described with reference to FIG. The main process of the display terminal 100 shown in FIG. 5 is a process executed when the power of the display terminal 100 is turned on. In addition, when the display terminal 100 is turned off, it is automatically terminated. Further, other processes executed in the display terminal 100 are executed in other processes. Description of other processing is omitted.

  When the main process of the display terminal 100 is executed, an initial setting process is performed (S11). In this initial setting process, various variables secured in the area of the RAM 103 when the main process is activated are initialized. Then, it is determined whether or not the synchronization button 121 has been pressed by the user (S12). This determination process is determined based on the value of the synchronization button flag (not shown) stored in the RAM 103. The value of the synchronization button flag becomes “1” when the synchronization button 121 is pressed. In the initial setting process (S11), the synchronization button flag is initialized to “0”.

  If it is determined that the synchronization button 121 has been pressed (S12: YES), that is, if the value of the synchronization button flag is “1”, a synchronization start process for communicating with other terminals is performed (S16). Details of the synchronization start process will be described later. Here, immediately after it is determined that the synchronization button 121 has been pressed, the value of the synchronization button flag is initialized to “0”. Then, the process proceeds to S12.

  When it is determined that the synchronization button 121 is not pressed (S12: NO), that is, when the value of the synchronization button flag is “0”, it is determined whether or not the display terminal 100 functions as a parent device. (S13). This determination process is determined based on the value of the operation mode flag (not shown) stored in the RAM 103. The operation mode flag is a flag indicating the operation mode of the display terminal 100. If the operation mode flag is not in communication with other display terminals 100, the operation mode is the normal mode and the value is “0”. If the display terminal 100 is operating as a parent device, the operation mode is the parent device mode, and the value is “1”. If the display terminal 100 is operating as a slave, the operation mode is the master mode and the value is “2”. In the initial setting process (S11), the operation mode flag is initialized to “0” in the normal mode.

  When it is determined that the display terminal 100 is not operating as a master unit (S13: NO), that is, when the value of the operation mode flag stored in the RAM 103 is not “1”, the process proceeds to S12, and the synchronization button is again displayed. It is determined whether or not 121 has been pressed (S12). That is, the determination process of S12 and S13 is repeated until the synchronization button 121 is pressed.

  If it is determined that the display terminal 100 is operating as a parent device (S13: YES), that is, if the value of the operation mode flag stored in the RAM 103 is “1”, whether or not the communication state is a standby state is determined. Determination is made (S14). This standby state is a state where the display terminal 100 of the parent device is waiting for communication connection from the display terminal 100 of the child device. This determination process is determined based on the value of a communication status flag (not shown) stored in the RAM 103. The communication state flag is a flag indicating the communication state of the display terminal 100 of the parent device. If the communication state flag is in a state of waiting for communication connection from the display terminal 100 of the child device, the communication state is a standby state, Becomes “1”. If the communication status flag is in the standby end state, the communication connection from the display terminal 100 of the slave unit is not accepted, and the value is “0”. In the initial setting process (S11), the communication state flag is initialized to “0”, which is a standby end state.

  When it is determined that the communication state is not the standby state (S14: NO), that is, when the value of the communication state flag stored in the RAM 103 is “0” that is the standby end state, the process proceeds to S12.

  When it is determined that the communication state is the standby state (S14: YES), that is, when the value of the communication state flag stored in the RAM 103 is “1” that is the standby state, the display terminal 100 of the slave unit A communication connection process, which is a process for connecting to, is performed (S15). Then, the process proceeds to S12. Details of this communication connection processing will be described later.

  Next, the synchronization start process will be described with reference to FIG. This process is a process executed in S16 of the main process in FIG. When the synchronization start processing is executed, the display terminal 100 of the parent device capable of communication is searched for within a predetermined time within a predetermined distance (S21). Here, the communicable parent display terminal 100 is the display terminal 100 operating in the parent device mode and the communication terminal is the display terminal 100 in the standby state. Further, the predetermined distance means a distance at which the wireless communication unit 113 of the display terminal 100 can communicate with the wireless communication unit 113 of another display terminal 100. Note that the predetermined time may be a time that allows confirmation of communication, and is set to 5 seconds as an example.

  Then, it is determined whether or not there is a parent display terminal 100 in a standby state within a certain time (S22). This determination means is determined based on the information of the operation mode flag and the communication status flag returned from the other display terminal 100 when another display terminal 100 is found within a predetermined time.

  When it is determined that there is a display terminal 100 of the master unit in the standby state (S22: YES), that is, the returned operation mode flag is “1” indicating the master unit mode, and the communication state is in the standby state. In the case of “1” indicating that the slave unit is “1”, a slave unit operation process that is a process for operating itself as a slave unit is executed (S23). Details of the slave unit operation process will be described later. Then, the synchronization start process ends.

  When it is determined that the display terminal 100 of the parent device does not exist (S22: NO), that is, the operation mode flag has not been received within a certain time, or the returned operation mode flag is other than “1”. Or, if the communication status flag is “0” indicating that it is in the standby end state, a base unit operation process that is a process for operating itself as a base unit is executed (S24). Details of this master unit operation process will be described later. Then, the synchronization start process ends.

  Next, with reference to FIG. 7, the master unit operation process will be described. This process is a process executed in S24 of the synchronization start process in FIG. When the base unit operation process is executed, the operation mode of the display terminal 100 is set to the base unit mode (S31). That is, the operation mode flag of the RAM 103 is set to “1” which is the master mode. Then, the communication state of the display terminal 100 is set to the standby state (S32). That is, “1” is set to the value of the communication state flag stored in the RAM 103. Then, a communication connection process for performing communication connection with the display terminal 100 of the slave unit is performed (S33).

  Next, communication connection processing will be described with reference to FIG. This process is a process executed in the main process (see FIG. 5: S15) or the parent device operation process (see FIG. 7: S33). When the communication connection process is executed, the timer starts counting (S41). The count start process is performed using a first counter that is a timer counter. This first counter is counted up based on a signal from the time measuring device 109 connected to the CPU 101.

  Next, the mobile device waits for connection with the display terminal 100 of the slave unit (S42). Here, a signal for connecting to the display terminal 100 of the slave unit is transmitted to the periphery of the display terminal 100 of the master unit. It is assumed that the transmitted signal includes a terminal ID for identifying the display terminal 100 of the parent device. Then, it is determined whether or not a terminal ID for identifying the display terminal 100 of the slave unit has been received from the display terminal 100 of the slave unit (S43). The terminal ID is information for identifying the display terminal 100 that is returned from the display terminal 100 of the slave unit in response to a signal transmitted from the display terminal 100 of the master unit. Here, as an example, the terminal ID is a Mac address of the display terminal 100. The terminal ID only needs to identify the display terminal 100 and may be a unique IP address.

  When it is determined that the terminal ID has been received from the display terminal 100 of the slave unit (S43: YES), the display unit of the display terminal 100 of the master unit is compared with the display terminal 100 of the slave unit specified by the received terminal ID The data displayed at 107 and the page information of the displayed data are transmitted (S46). Then, the communication connection process ends.

  When it is determined that the terminal ID has not been received from the display terminal 100 of the slave unit (S43: NO), it is determined whether or not a timeout has occurred (S44). This determination processing for determining whether or not the timeout has occurred is determined by whether or not the count value of the first counter has elapsed for a certain time. This fixed time is the maximum time that can be waited for the display terminal 100 of the child device to connect, and is, for example, 5 minutes.

  When it is determined that the time-out has not occurred (S44: NO), that is, when it is determined that the value of the first counter has not passed the fixed time of 5 minutes, the process proceeds to S42.

  When it is determined that a time-out has occurred (S44: YES), that is, when it is determined that the value of the first counter has exceeded a fixed time of 5 minutes, a time-out display is displayed on the display unit 107 (S45). ), The master unit operation process is terminated. Here, as an example, the time-out display is “The slave could not be connected”.

  Next, the slave unit operation process will be described with reference to FIG. This process is a process executed in S23 of the synchronization start process in FIG. When the slave unit operation process is executed, the operation mode is set to the slave unit mode in order to operate the display terminal 100 as a slave unit (S51). That is, the operation mode flag of the RAM 103 is set to “2” which is the slave mode.

  Then, its own terminal ID is transmitted to the retrieved display terminal 100 of the parent device (S52). Then, the data for display on its own display unit 107 and the page information of the data are received from the display terminal 100 of the parent device (S53). These pieces of information are data transmitted from the display terminal 100 of the parent device in S46 of FIG. The received data is stored in the data storage area 1101 of the EEPROM 104. Next, data is displayed on the display unit 107 based on the received information (S54). Here, the data displayed on the display unit 107 is a page specified by the received page information. Then, the slave unit operation process ends.

  As described above, according to the present embodiment, when the synchronization button 121 is pressed, a search is performed as to whether or not the display terminal 100 that operates in the parent device mode exists around. When the parent display terminal 100 does not exist in the vicinity, it operates as the parent display terminal 100. Then, when the display terminal 100 of the slave unit is connected, the display of the slave unit that has connected the data displayed on the display unit 107 is displayed. It transmits to the terminal 100. Further, when there is a display terminal 100 of the parent device around, it operates as the display terminal 100 of the child device. Then, the data displayed on the display terminal 100 of the parent device is received from the display terminal 100 of the parent device and displayed on the display unit 107 of itself. As a result, whether to operate as a parent device or a child device can be easily determined at the timing when the synchronization button 121 is instructed, and the data displayed on the display terminal 100 of the parent device is determined as the child device. It can be displayed on the display terminal 100 in the mode. Further, since the synchronization button 121 is common to the parent display terminal 100 and the child display terminal 100, the user does not need to learn a plurality of operations.

  Here, the EEPROM 104 corresponds to “storage means”, the display unit 107 corresponds to “display means”, and the synchronization button 121 corresponds to “first instruction means”. The wireless communication unit 113 corresponds to “communication means” and the terminal ID corresponds to “identification information”.

  Further, the CPU 101 that executes S54 in FIG. 9 corresponds to “display control means”, and the CPU 101 that executes S12 in FIG. 5 corresponds to “first instruction determination means”. The CPU 101 that executes S21 of FIG. 6 corresponds to “first determination means”, and the CPU 101 that executes the processing of S31 of FIG. 7 and S51 of FIG. 9 corresponds to “mode setting means”. The CPU 101 that executes S32 in FIG. 7 corresponds to “communication state setting means”, and the CPU 101 that executes S52 in FIG. 9 corresponds to “identification information transmitting means”. The CPU 101 that executes S43 in FIG. 8 corresponds to the “second determination unit”, the CPU 101 that executes S46 in FIG. 8 corresponds to the “first transmission unit”, and the CPU 101 that executes S53 in FIG. Corresponds to “receiving means”.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible. Hereinafter, modified examples will be described.

  In the display terminal 100 of the above-described embodiment, when it is determined in the communication connection process of FIG. 8 that the terminal ID is received from the display terminal 100 of the slave unit (S43: YES), the display terminal 100 is specified by the received terminal ID. Although the data displayed by itself is transmitted to the display terminal 100 of the slave unit, the present invention is not limited to this. For example, an instruction as to whether or not to transmit the displayed data to the display terminal 100 of the slave unit may be received from the user of the display terminal 100 of the base unit.

  Hereinafter, the communication connection process of the display terminal 100 according to the first modification will be described with reference to FIG. FIG. 10 is a flowchart of a communication connection processing subroutine executed by the display terminal 100 according to the first modification. Since other processes in the display terminal 100 of the first modification are the same as those in the above-described embodiment, the description thereof is omitted. Further, the processing of S61 to S65 in FIG. 10 is the same as the processing of S41 to S45 in FIG.

  When the communication connection process of the display terminal 100 of the first modification is executed and it is determined that the terminal ID is received from the display terminal 100 of the slave (S63: YES), the slave of the slave specified by the received terminal ID It is determined whether or not an instruction to transmit data to the display terminal 100 has been issued by the user of the parent display terminal 100 (S66). Here, a message is displayed on the display unit 107, and it is determined whether or not the enter button 122 is pressed. As an example of the displayed message, “Do you want to send the displayed data to the display terminal (00-AA-BB-CC-DD-EE)?” Is displayed.

  When an instruction to transmit data is given by the user of the display terminal 100 of the parent device (S66: YES), that is, when the determination button 122 is pressed, the display terminal of the child device specified by the received terminal ID The data displayed on the display unit 107 of the display terminal 100 of the parent device and the page information of the displayed data are transmitted to 100 (S67). Then, the communication connection process ends.

  Further, when the instruction to transmit data is not made by the user of the display terminal 100 of the parent device (S66: NO), that is, when the determination button 122 is not pressed and the cancel button (not shown) is pressed, The process of S67 is not performed, and the communication connection process is terminated.

  As described above, in the first modification, when communication is performed from the display terminal 100 of the slave unit in the display terminal 100 of the master unit, the user of the display terminal 100 of the master unit is the slave unit that has communicated. Whether or not to communicate with the display terminal 100 can be selected. When the determination button 122 is instructed, the data displayed on the display terminal 100 of the parent device is transmitted to the display terminal 100 of the child device. In addition, when a cancel button (not shown) is instructed, data is not transmitted. As a result, it is possible to prevent data transmission to the display terminal 100 of the unintended child device.

  In the first modification described above, the determination button 122 corresponds to “third instruction means”. The CPU 101 that executes S66 in FIG. 10 corresponds to the “third instruction determination unit”, and the CPU 101 that executes S67 in FIG. 10 corresponds to the “first transmission unit”.

  In the display terminal 100 of the above-described embodiment, the display terminal 100 of the slave unit always receives data to be displayed on the display terminal 100 of the slave unit from the display terminal 100 of the master unit. do not do. For example, if the display terminal 100 of the slave unit stores data to be displayed on the display unit 107 in advance, the data may not be received from the display terminal 100 of the master unit.

  Hereinafter, with reference to FIG.11 and FIG.12, the communication connection process of the display terminal 100 of a 2nd modification and a subunit | mobile_unit operation | movement process are demonstrated. FIG. 11 is a flowchart of a communication connection processing subroutine executed by the display terminal 100 according to the second modification. FIG. 12 is a flowchart of a sub-unit operation processing subroutine executed by the display terminal 100 according to the second modification. Since other processes in the display terminal 100 of the second modification are the same as those in the above-described embodiment, the description thereof is omitted.

  First, the communication connection process of the display terminal 100 according to the second modification will be described with reference to FIG. This communication connection process is a process executed in the main process (see FIG. 5: S15) or the master unit operation process (see FIG. 7: S33), as in the above-described embodiment. Here, the processes of S41 to S45 of the communication connection process (see FIG. 8) of the above-described embodiment and the processes of S73 to S77 of the communication connection process of the second modification shown in FIG. Is omitted.

  As shown in FIG. 11, when it is determined that the terminal ID is received from the display terminal 100 of the slave unit (S75: YES), it is displayed on the display unit 107 with respect to the display terminal 100 of the connected slave unit. The file name of the data and page information are transmitted (S78). Here, the page information is a page number of data displayed on the display unit 107.

  Then, it is determined whether or not the request information is received within a predetermined time from the display terminal 100 of the slave unit (S79). This request information is information for requesting data to be displayed on the display unit 107 from the display terminal 100 of the child device to the display terminal 100 of the parent device. Note that the process of determining whether or not this request information has been received is performed within a certain time. The measurement of the fixed time is performed using a third counter that is a timer counter. This third counter is counted up based on a signal from the time measuring device 109 connected to the CPU 101. This fixed time is the maximum time until the request information is received, and is set to 5 seconds as an example.

  If it is determined that the request information has not been received within a certain time (S79: NO), the communication connection process is terminated. When the request information is received within a certain time (S79: YES), the data displayed on the display unit 107 of the parent device is transmitted to the display terminal 100 of the child device specified by the received terminal ID. (S80). Then, the communication connection process ends.

  Next, with reference to FIG. 12, the slave unit operation process of the display terminal 100 of the second modification will be described. This slave unit operation process is a process executed in the synchronization start process (see S23 in FIG. 6), as in the above-described embodiment.

  When the slave unit operation process of the display terminal 100 of the second modification is executed, the operation mode is set to the slave unit mode in order to operate the display terminal 100 as a slave unit (S91). That is, the operation mode flag of the RAM 103 is set to “2” which is the slave mode.

  Then, its own terminal ID is transmitted to the retrieved display terminal 100 of the parent device (S92). Then, the file name of the data to be displayed on the display unit 107 and the page information of the data to be displayed on the display unit 107 are received from the display terminal 100 of the parent device (S93). These pieces of information are information transmitted from the display terminal 100 of the parent device in S78 of FIG.

  Next, it is searched whether the data having the same file name as the received file name is stored in the data storage area 1101 of the EEPROM 104 (S94), and it is determined whether it is stored in the data storage area 1101 (S95). .

  When it is determined that the received file name data is stored in the data storage area 1101 (S95: YES), that is, the data having the same file name as the received file name is stored in the data storage area 1101 of the EEPROM 104. If it is, data having the same file name as the received file name is acquired from the data storage area 1101. In the acquired data, the page specified by the page information received in S93 is displayed on the display unit 107 (S99). Then, the slave unit operation process ends.

  If it is determined that the received file name data is not stored in the data storage area 1101 (S95: NO), that is, the data having the same file name as the received file name is stored in the data storage area 1101 of the EEPROM 104. If not stored, the request information is transmitted to the display terminal 100 of the connected master unit (S96). This request information is information for requesting data to be displayed on the display unit 107 from the display unit 100 of the slave unit to the display terminal 100 of the master unit, and is received by the display terminal 100 of the master unit. It is determined whether or not (see FIG. 11: S79).

  Next, data to be displayed on the display unit 107 is received from the display terminal 100 of the parent device that has received the request signal (S97). This data is transmitted from the parent terminal display terminal 100 in S80 of FIG. The received data is stored in the data storage area 1101 of the EEPROM (S98). In the received data, the page specified by the page information received in S93 is displayed on the display unit 107 (S99), and the slave unit operation process ends.

  As described above, in the second modification, the file name of the data displayed on the display unit 107 and the page information are transmitted from the display terminal 100 of the parent device to the display terminal 100 of the connected child device. Is done. When receiving the file name and page information, the display terminal 100 of the slave unit searches whether data having the same file name as the received file name is stored in the data storage area 1101 of the EEPROM 104, and the data storage area 1101. It is determined whether or not the file is stored. When it is determined that the received file name data is stored in the data storage area 1101, the data stored in the data storage area 1101 is displayed on the display unit 107. If it is determined that the data is not stored in the data storage area 1101, request information is transmitted to the display terminal 100 of the parent device. When the request information is received at the display terminal 100 of the parent device, the data displayed on the display terminal 100 of the parent device is transmitted to the display terminal 100 of the child device that transmitted the request information. The slave display terminal 100 that has transmitted the request information receives data from the master display terminal 100. Accordingly, the display terminal 100 of the parent device transmits data only to the display terminal 100 of the child device that transmitted the request information. As a result, data is not unnecessarily transmitted to the display terminal 100 of the slave unit. In addition, when data is stored in the display terminal 100 in the slave mode, the data display speed can be improved.

  In the second modification described above, the file name corresponds to “specific information”. The CPU 101 that executes S78 in FIG. 11 corresponds to the “second transmission unit”, and the CPU 101 that executes S79: YES in FIG. 11 corresponds to the “second reception unit”. The CPU 81 that executes S80 in FIG. 11 corresponds to the “first transmission unit”, and the CPU 101 that executes S98 in FIG. 12 corresponds to the “storage control unit”. The CPU 101 that executes S93 in FIG. 12 corresponds to the “third receiving unit”, and the CPU 101 that executes S95 in FIG. 12 corresponds to the “storage determination unit”. The CPU 101 that executes S96 in FIG. 12 corresponds to the “third transmission unit”, and the CPU 101 that executes S99 in FIG. 12 corresponds to the “display control unit”.

  In the display terminal 100 according to the above-described embodiment, a plurality of the display terminals 100 of the slave units can be connected to and communicate with the display terminal 100 of the master unit, but the present invention is not limited to this. For example, if one display terminal 100 of the child device is connected to the display terminal 100 of the parent device, the display terminal 100 of another child device may not be connected.

  Hereinafter, the communication connection process of the display terminal 100 according to the third modification will be described with reference to FIG. FIG. 13 is a flowchart of a communication connection processing subroutine executed by the display terminal 100 according to the third modification. Since other processes in the display terminal 100 of the third modification are the same as those in the above-described embodiment, the description thereof is omitted.

  With reference to FIG. 13, the communication connection process of the display terminal 100 of the third modification will be described. This communication connection process is a process executed in the main process (see FIG. 5: S15) or the master unit operation process (see FIG. 7: S33), as in the above-described embodiment. Here, the processes of S73 to S80 of the communication connection process (see FIG. 11) of the second modification described above and the processes of S103 to S110 of the communication connection process of the third modification shown in FIG. Description is omitted.

  As shown in FIG. 13, when the data displayed on the display unit 107 of the master unit is transmitted to the display terminal 100 of the slave unit that has transmitted the request information (S110), processing for canceling the standby state is performed. (S111). Here, the value of the communication state flag stored in the RAM 103 is updated from “1” in the standby state to “0” in the standby end state. As a result, the display terminal 100 of the parent device does not accept communication connections from the display terminals 100 of other child devices.

  As described above, in the third modification, the display device 100 of the parent device transmits the data displayed on its display unit 107 to the display terminal 100 of the child device that is connected first. The own communication state is changed from the standby state to the standby end state. Thereby, the display terminal 100 of the parent device enters a state where it does not accept communication from the display terminals 100 of other child devices. As a result, one-to-one communication between the display terminal 100 of the parent device and the display terminal 100 of the child device becomes possible, and data can be transmitted only to the display terminal 100 of the specific child device.

  In the third modification described above, the CPU 101 that executes S111 in FIG. 13 corresponds to the “first communication state changing unit”.

  In the display terminal 100 according to the above-described embodiment, a plurality of slave terminal display terminals 100 can connect to and communicate with the master terminal display terminal 100 without time restrictions. It is not limited to this. For example, a predetermined time may be set in advance, and the display terminal 100 of the slave unit may be connected to the display terminal 100 of the master unit within the predetermined time.

  Hereinafter, the communication connection process of the display terminal 100 according to the fourth modification will be described with reference to FIG. FIG. 14 is a flowchart of a communication connection processing subroutine executed by the display terminal 100 according to the fourth modification. This communication connection process is a process executed in the main process (see FIG. 5: S15) or the master unit operation process (see FIG. 7: S33), as in the above-described embodiment. Since other processes in the display terminal 100 according to the fourth modification are the same as those in the above-described embodiment, the description thereof is omitted.

  As shown in FIG. 14, when the communication connection process is executed, the timer starts counting (S123). This count start process is performed using a fourth counter which is a timer counter. The fourth counter is counted up based on a signal from the timing device 109 connected to the CPU 101.

  Next, it is in a state of waiting for connection with the display terminal 100 operating in the slave mode (S124). Here, a signal for connecting to the display terminal 100 of the slave unit is transmitted to the periphery of the display terminal 100 of the master unit. It is assumed that the transmitted signal includes a terminal ID for identifying the display terminal 100 of the parent device. Then, it is determined whether or not a terminal ID for identifying the display terminal 100 of the slave unit has been received from the display terminal 100 of the slave unit (S125).

  When it is determined that the terminal ID is received from the display terminal 100 of the slave unit (S125: YES), the display unit of the display terminal 100 of the master unit is compared with the display terminal 100 of the slave unit specified by the received terminal ID The data displayed at 107 and the page information of the displayed data are transmitted (S126). Then, it is determined whether the request information has been received (S127). This request information is information for requesting data to be displayed on the display unit 107 from the display terminal 100 of the child device to the display terminal 100 of the parent device. Note that the process of determining whether or not this request information has been received is performed within a certain time. The measurement of the certain time is performed using a fifth counter that is a timer counter. The fifth counter is counted up based on a signal from the time measuring device 109 connected to the CPU 101. This fixed time is the maximum time until the request information is received, and is set to 5 seconds as an example.

  When the request information is received within a predetermined time (S127: YES), the data displayed on the display unit 107 of the parent device is transmitted to the display terminal 100 of the child device that transmitted the request information (S128). Then, it is determined whether or not a timeout has occurred (S129). This determination process of whether or not a timeout has occurred is determined by whether or not the count value of the fourth counter started in S123 has passed a predetermined time. The predetermined time here is the maximum waiting time for accepting the connection of the display terminal 100 of the slave unit, and is 5 minutes as an example.

  If the request information is not received within a certain time (S127: NO), that is, if the request information is not received within 5 seconds, the process proceeds to S129.

  If it is determined that the time-out has not occurred (S129: NO), that is, if it is determined that the value of the fourth counter has not exceeded the predetermined time of 5 minutes, the process proceeds to S124 again, and the slave unit The display terminal 100 waits for communication connection.

  If it is determined that a time-out has occurred (S129: YES), that is, if it is determined that the value of the fourth counter has exceeded a predetermined time of 5 minutes, processing for canceling the standby state is performed (S130). Here, the value of the communication state flag stored in the RAM 103 is updated from “1” in the standby state to “0” in the standby end state. As a result, communication connection from the display terminal 100 of another child device is not accepted. Then, the communication connection process ends.

  As described above, in the fourth modification, the display terminal 100 of the parent device receives the terminal ID from the display terminal 100 of the child device for a predetermined time. When the request information is received from the display terminal 100 of the slave unit that has transmitted the terminal ID, the data displayed on the display unit 107 of the display terminal 100 of the master unit is transmitted to the display terminal 100 of the slave unit. Thereby, until a predetermined time elapses, the display terminal 100 of the parent device can communicate with the display terminals 100 of the plurality of child devices, and can transmit the displayed data.

  In the fourth modification described above, the CPU 101 that executes S129 in FIG. 14 corresponds to “time determination means”, and the CPU 101 that executes S130 in FIG. 14 corresponds to “first communication state change means”.

  In the display terminal 100 according to the above-described embodiment, once the communication connection between the display terminal 100 of the parent device and the display terminal 100 of the child device is performed, the communication is continued, but the present invention is not limited to this. For example, the communication state may be canceled if the synchronization button 121 is pressed again during communication.

  Hereinafter, the synchronization control process of the display terminal 100 according to the fifth modification will be described with reference to FIGS. 15 and 16. FIG. 15 is a flowchart of main processing executed by the display terminal 100 according to the fifth modification. FIG. 16 is a flowchart of a subroutine of a synchronization control process executed on the display terminal 100 according to the fifth modification.

  With reference to FIG. 15, the main process of the display terminal 100 of the fifth modification will be described. This main process is a process executed when the power of the display terminal 100 is turned on, as in the above-described embodiment. In addition, when the display terminal 100 is turned off, it is automatically terminated. In addition, other processes executed in the display terminal 100 are assumed to be executed in other processes, and descriptions of the other processes are omitted. Here, the processing of S11 to S15 of the main processing (see FIG. 5) of the above-described embodiment and the processing of S141 to S145 of the main processing of the fifth modification shown in FIG. To do.

  As shown in FIG. 15, when the main process of the fifth modification is executed and it is determined that the synchronization button 121 is pressed (S142: YES), it is determined whether or not communication with other display terminals 100 is being performed. (S146). This determination process is determined based on whether the operation mode is the display terminal 100 in the parent device mode or the child device mode. That is, it is determined whether or not the value of the operation mode flag stored in the operation mode flag storage area in the RAM 103 is “1” or “2”.

  If it is determined that communication is being performed with another display terminal 100 (S146: YES), that is, the value of the operation mode flag stored in the operation mode flag storage area in the RAM 103 is “1” or “2”. If there is, a synchronization control process for controlling communication connection with the other display terminal 100 is performed (S147). Details of this synchronization control processing will be described later. Then, the process proceeds to S142, and it is determined again whether or not the synchronization button 121 has been pressed.

  When it is determined that communication with another display terminal 100 is not made (S146: NO), that is, when the value of the operation mode flag stored in the operation mode flag storage area in the RAM 103 is “0”, A synchronization start process for communicating with the display terminal 100 is performed (S148). Since this synchronization start process is the same as that of the above-described embodiment, the description thereof is omitted. Then, the process proceeds to S142, and it is determined again whether or not the synchronization button 121 has been pressed.

  Next, the synchronization control process will be described with reference to FIG. This process is a process executed in S147 of the main process in FIG. When the synchronization control process is executed, it is determined whether or not the display terminal 100 is the parent device (S151). This determination process is determined based on whether or not the operation mode flag stored in the RAM 103 is the master mode. That is, it is determined whether or not the value of the operation mode flag is “1”.

  When the display terminal 100 is not the parent device (S151: NO), that is, when the operation mode flag is the child device mode and the value is “2”, the communication synchronization state with the display device 100 of the parent device is released. (S160). Here, the value of the operation mode flag becomes a normal mode that is a normal state in which communication is not performed, and the value becomes “0”. Then, the synchronization control process ends.

  When the display terminal 100 is the parent device (S151: YES), that is, when the operation mode flag is the parent device mode and the value is “1”, the communication state is the communication with the display terminal 100 in the child device mode. Is in a standby state, which is a state of waiting for the start of (S152). That is, the value of the communication status flag stored in the RAM 103 is set to “1”.

  Next, the timer count is started (S153). This count start process is performed using a sixth counter which is a timer counter. The sixth counter is counted up based on a signal from the time measuring device 109 connected to the CPU 101.

  Next, the mobile device waits for connection with the display terminal 100 of the slave (S154). Here, a signal for connecting to the display terminal 100 of the slave unit is transmitted to the periphery of the display terminal 100 of the master unit. It is assumed that the transmitted signal includes a terminal ID for identifying the display terminal 100 of the parent device. Then, it is determined whether or not a terminal ID for identifying the display terminal 100 of the slave unit has been received from the display terminal 100 of the slave unit (S155).

  When it is determined that the terminal ID has been received from the display terminal 100 of the slave unit (S155: YES), the display unit of the display terminal 100 of the master unit is compared with the display terminal 100 of the slave unit specified by the received terminal ID The data displayed in 107 and the page information of the displayed data are transmitted (S156). And it is judged whether the display terminal 100 of the predetermined number of subunit | mobile_units was connected (S157). This determination is made based on whether or not the value of the slave unit connection variable (not shown) stored in the RAM 103 is a predetermined number or more. The slave unit connection variable is initialized to “0” at the same time when the timer starts counting in S153. And when it is judged that the display terminal 100 of the subunit | mobile_unit was connected (S155: YES), it counts up. Here, the predetermined number of values is, for example, “5”.

  When it is determined that the predetermined number of handset display terminals 100 are not connected (S157: NO), that is, the value of the handset connection variable stored in the RAM 103 is smaller than “5”, which is the predetermined number. If so, it is determined whether or not a timeout has occurred (S158). This determination processing for determining whether or not the timeout has occurred is determined by whether or not the count value of the sixth counter has elapsed for a certain time. This fixed time is the maximum time that can be waited for the display terminal 100 of the child device to connect, and is, for example, 5 minutes.

  If it is determined that the terminal ID is not received from the display terminal 100 of the slave unit (S155: NO), the process proceeds to S158.

  When it is determined that the time-out has not occurred (S158: NO), that is, when it is determined that the value of the sixth counter has not passed the fixed time of 5 minutes, the process proceeds to S154.

  When it is determined that a time-out has occurred (S158: YES), that is, when it is determined that the value of the sixth counter has passed a fixed time of 5 minutes, a state of accepting communication of the display terminal 100 of another child device A process for canceling the standby state is performed (S159). Here, the value of the communication state flag stored in the RAM 103 is updated from “1” in the standby state to “0” in the standby end state. As a result, communication connection from the display terminal 100 of another child device is not accepted. Then, the synchronization control process ends.

  Further, when it is determined that the display terminals 100 of a predetermined number of slave units have been connected (S157: YES), that is, when the value of the slave unit connection variable stored in the RAM 103 is a predetermined number “5” or more, The process proceeds to S159.

  As described above, in the fifth modification, when the synchronization button 121 is pressed again in the display terminal 100 of the slave unit communicating with the display terminal 100 of the master unit, its own operation mode is the display of the master unit. The normal mode in which communication with the terminal 100 is not performed. As a result, communication with the display terminal 100 in the master mode can be easily canceled. Further, since the operation for connecting to the display terminal 100 of the parent device and the operation for releasing the connection are the same operation, the user of the display terminal 100 of the child device does not need to learn a plurality of operations.

  Further, when the synchronization button 121 is pressed again in the standby end state where the communication with the display terminal 100 of the other slave unit is not accepted in the display terminal 100 of the master unit, the communication with the display terminal 100 of the other slave unit is performed. It will be in the standby state to accept. As a result, the synchronization button 121 is instructed on the display terminal 100 of the parent device even if the communication with the display terminal 100 of the other child device is not accepted once in a state where a meeting or the like is being performed. In this way, communication with the display terminal 100 of another child device used by a person who is late for the conference becomes possible. And the data to display can be transmitted with respect to the display terminal 100 of the subunit | mobile_unit used by the late person.

  In the fifth modification described above, the CPU 101 that executes S160 in FIG. 16 corresponds to the “mode changing unit”, and the CPU 101 that executes S152 in FIG. 16 corresponds to the “second communication state changing unit”.

  In the display terminal 100 of the above-described embodiment, when the operation mode is set to the slave mode, the display terminal 100 transmits its own terminal ID to the searched display terminal 100 of the master unit, and the master unit However, the present invention is not limited to this. For example, the user may operate as a slave unit, receive data from the display terminal 100 of the master unit, and confirm that the user using the display terminal 100 displays the data.

  Hereinafter, with reference to FIG. 17, the slave unit operation process of the display terminal 100 according to the sixth modification will be described. FIG. 17 is a flowchart of a sub-unit operation processing subroutine executed by the display terminal 100 according to the sixth modification. Note that other processes in the display terminal 100 of the sixth modification are the same as those in the above-described embodiment, and thus the description thereof is omitted. Further, the processing of S52 to S54 of the slave unit operation processing (see FIG. 9) of the above-described embodiment and the processing of S163 to S165 of the slave unit operation processing of the sixth modified example shown in FIG. Description is omitted.

  As shown in FIG. 17, when the slave unit operation process of the sixth modification is executed, the operation mode is set to the slave unit mode in order to operate the display terminal 100 as a slave unit (S161). That is, the operation mode flag of the RAM 103 is set to “2” which is the slave mode.

  Then, it is determined whether or not an instruction to receive data from the retrieved display device 100 of the parent device has been issued by the user (S162). Here, the message is displayed on the display unit 107 of the display terminal 100 of the slave unit. Then, it is determined whether or not the enter button 122 has been pressed. As an example, the message is “Can I receive and display data from the parent device?”.

  When it is determined that an instruction to receive data from the display terminal 100 of the parent device has been issued by the user (S162: YES), that is, when it is determined that the enter button 122 has been pressed, the process proceeds to S163.

  In addition, when an instruction to receive data is not given by the user of the display terminal 100 of the slave unit (S162: NO), that is, when the determination button 122 is not pressed and the cancel button (not shown) is pressed, The processes of S163 to S165 are not performed, and the slave unit operation process is terminated.

  As described above, in the sixth modification, it is determined whether or not an instruction to receive data from the display terminal 100 of the parent device is issued from the user in the display terminal 100 of the child device. The terminal ID is transmitted to the parent display terminal 100 only when an instruction to receive data from the parent display terminal 100 is given by the user. Thereby, the user who uses the display terminal 100 of the child device can decide to receive data from the display terminal 100 of the parent device. As a result, in a situation not intended by the user using the display device 100 of the slave unit, the display terminal 100 of the slave unit receives data from the display terminal 100 of the master unit, and the received data is displayed on the display unit 107. Can be prevented.

  In the above-described sixth modification, the determination button 122 corresponds to “second instruction unit”. The CPU 101 that executes S162 in FIG. 17 corresponds to the “second instruction determination unit”, and the CPU 101 that executes S163 in FIG. 17 corresponds to the “identification information transmission unit”.

  In the display terminal 100 of the above-described embodiment, the communication between the display terminals 100 is controlled by pressing the synchronization button 121, but the present invention is not limited to this. For example, communication between display terminals 100 may be controlled from a menu screen.

Hereinafter, with reference to FIG. 18, the display terminal 100 of the seventh modification will be described. FIG.
It is a top view of the display terminal 100 of the 7th modification. Here, in FIG. 18, the upper side of the drawing is the “upper side” of the display terminal 100, the lower side of the drawing is “lower”, the right side of the drawing is “right”, and the left side of the drawing is “left”. Also, the front side of the page is the “front side” of the display terminal 100, and the back side of the page is the “back side” of the display terminal 100.

  As shown in FIG. 18, the display terminal 100 is formed in a substantially rectangular shape in plan view, as in the above-described embodiment. A display unit 107 and an input unit 108 are provided on the front side of the display terminal 100, but the input unit 108 has a feature that the synchronization button 121 described above is not provided.

  Here, when the determination button 122 is pressed, the menu screen 130 is displayed, and an operation for controlling communication between the parent device and the child device is displayed. For example, in the display terminal 100 shown in FIG. 18, the button on the right side of the cross button 123 is a button for controlling communication between the display terminals 100. Thereby, it is not necessary to provide the synchronization button of the above-described embodiment, and communication between the display terminals 100 can be controlled only by the cross button 123 used in a normal operation.

  Moreover, you may make it control communication between the display terminals 100 by another operation | movement. For example, an acceleration sensor may be built in the display terminal 100, and the user may control communication between the display terminals 100 by swinging the display terminal 100 left and right by a predetermined angle.

  Further, in the display terminal 100 according to the above-described embodiment, when there is no parent display terminal 100 in a standby state within a certain period of time, a parent device operation process for operating itself as the parent display terminal 100 (see FIG. 7). ) Is performed. Then, the own operation mode is set to the master mode (S31), and the communication connection process (S33) is executed. However, the present invention is not limited to this. For example, immediately after the base unit operation process is executed, a display screen (not shown) for instructing the user whether or not his display terminal 100 may function as the base unit is displayed on the display unit 107. You may make it.

  When the user of the display terminal 100 gives an instruction that his / her display terminal 100 may function as a parent device, the processing of S31 to S33 is executed, and the display terminal 100 of his / her own displays the parent device. If it is instructed that the function does not function, the processes of S31 to S33 may be prevented from being executed. Thereby, when own display terminal 100 functions as a parent machine, it is possible to confirm whether or not the user's own display terminal 100 may function as a parent machine. As a result, the display terminal 100 of its own functions as a parent device, and it is possible to prevent unintended data transmission to the display terminal 100 of the child device.

1 Network 100 Display terminal 101 CPU
102 ROM
103 RAM
104 EEPROM
105 counter 106 display control unit 107 display unit 108 input unit 109 timing device 113 wireless communication unit 121 synchronization button 122 decision button 1101 data storage area

Claims (10)

A display terminal comprising: display means; storage means for storing display data to be displayed on the display means; and display control means for causing the display data to be displayed on the display means,
Communication means for performing wireless communication with other display terminals;
First instruction means for instructing start of synchronization of display contents displayed on the display means with the other display terminals;
First instruction determination means for determining whether or not an instruction is given by the first instruction means;
When it is determined that the instruction has been given by the first instruction determination unit, the other terminal that operates in the operation mode of the master mode indicating that the display terminal is the side that transmits the display data to the other display terminal. First determination means for determining whether or not the display terminal is within a communication range of the communication means;
When it is determined by the first determination means that there is no other display terminal in the parent device mode, its own operation mode is set to the parent device mode, and the other display terminal in the parent device mode is set. Mode setting means for setting its own operation mode to a handset mode indicating that the display terminal is the display terminal that receives the display data from the other display terminals,
Communication state setting means for setting its own communication state to a standby state in which it waits for the start of communication with the display terminal in the slave mode when the mode setting means sets the master mode When,
Identification information transmitting means for transmitting identification information for identifying itself via the communication means to the display terminal in the parent device mode when the slave mode is set by the mode setting means;
Second determination means for determining whether or not the identification information transmitted by the identification information transmission means is received when the communication state is the standby state;
In the master unit mode, when the second determination unit determines that the identification information is received from the display terminal in the slave unit mode, the display data displayed on the display unit is received. First transmission means for transmitting to the display terminal in the slave mode specified by the identification information;
A first receiving means for receiving the display data transmitted from the first transmitting means of the display terminal in the other parent device mode when the slave mode is set by the mode setting means;
The display control means, wherein the display control means causes the display means to display the display data received by the first receiving means in the slave mode. In the parent device mode, when the second determination means determines that the identification information is received from the display terminal in the child device mode, the display of the child device mode specified by the received identification information Second transmission means for transmitting to the terminal specific information which is information for specifying the display data displayed on the display terminal in the slave mode;
In the parent device mode, request information that is information for requesting the display terminal in the parent device mode to receive the display data to be displayed on the display terminal in the child device mode is used as the display terminal in the child device mode. Second receiving means for receiving from,
When the request information is received by the second reception means, the first transmission means sends the display data displayed on the display means to the display terminal in the slave mode that has transmitted the request information. The display terminal according to claim 1, wherein the display terminal transmits the display terminal. Storage control means for storing the display data received by the first receiving means in the storage means;
In the slave mode, third receiving means for receiving the specific information transmitted by the second transmission means from the display terminal in the master mode;
Storage determination means for determining whether or not the display data specified by the specific information received by the third receiving means is stored in the storage means;
Third transmission for transmitting the request information to the display terminal in the master mode when the storage determining unit determines that the display data specified by the specific information is not stored in the storage unit Means,
In the slave mode, the display control unit displays the display data stored in the storage unit when the storage determination unit determines that the display data is stored in the storage unit. And when the storage determining means determines that the display data is not stored in the storage means, the display means receives the display data received by the first receiving means. The display terminal according to claim 2, wherein: In the slave mode, second instruction means for giving an instruction to receive the display data from the display terminal in the master mode;
Second instruction determination means for determining whether or not an instruction is given by the second instruction means;
The identification information transmitting means is set to the slave unit mode by the mode setting means, and when the second instruction determining means determines that an instruction has been given, the identification information is transmitted to the display terminal in the master mode. The display terminal according to claim 1, wherein the display terminal transmits the information to the display terminal. Third instruction means for giving an instruction to transmit the display data displayed on the display means to the display terminal in the slave mode specified by the identification information in the master mode;
Third instruction determining means for determining whether or not an instruction is given by the third instruction means;
In the master mode, the first transmission means determines that the second determination means has received the identification information from the display terminal in the slave mode, and is instructed by the third instruction determination means. The display data displayed on the display means is transmitted to the display terminal in the slave mode specified by the received identification information when it is determined that the display means is displayed. The display terminal in any one.   When the communication state is the standby state, the communication state of the terminal is changed from the standby state to the standby state at a predetermined timing, and communication with the display terminal in the slave mode is completed. 6. The display terminal according to claim 1, further comprising first communication state changing means for changing to a standby end state in which the start of the communication is not newly performed.   The display terminal according to claim 6, wherein the predetermined timing is a timing at which the display data is transmitted to the display terminal in the slave mode by the first transmission unit. A time determination unit that determines whether a predetermined time has elapsed since the communication state is set to the standby state by the communication state setting unit;
The display terminal according to claim 6, wherein the predetermined timing is a timing at which the predetermined time is determined by the time determination unit.   In the slave unit mode, when it is determined again that the first instruction determination unit has instructed, the display terminal does not communicate with the display terminal in the master unit mode as its own operation mode. The display terminal according to claim 1, further comprising a mode changing unit that changes the mode to a normal mode.   After the communication state is changed to the standby end state by the first communication state changing unit, if it is determined again that the first instruction determining unit has instructed, the communication state of itself is set to the standby state. The display terminal according to claim 6, further comprising second communication state changing means for changing to a state.

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