KR20110004583A - Sink and method for transmitting display information in electronic shelf label system - Google Patents

Abstract

PURPOSE: A sink of an electronic price display system and a display information transmission method thereof are provided perform communication with searched sink and to display the display information by updating the information. CONSTITUTION: A memory(220) stores a list of terminals, which will update display information provided from a server according to control of a processor. A communication module(230) communicates with a common channel of preset frequency according to the control of the processor. The communication module searches a data transmission channel according to the control of a processor if the display information is transmitted to the terminal. The communication module transmits display information to the searched data transmission channel.

Description

Sink and method for transmitting display information in Electronic Shelf Label system

The present invention relates to a sink and display information transmission method of an electronic price display system.

Various stores including supermarkets that display and sell certain items usually display the goods on shelves, and display information such as product name and price on the front of the shelves where the goods are displayed, thereby allowing consumers to It provides a simple way to check the information.

The goods displayed on the shelf and the display information of the goods are not fixed and can be changed from time to time. Whenever the display information of the goods to be displayed is changed, the seller writes the name of the goods and the price of the goods on the paper price list. The item is attached to the front of the shelf.

However, the use of the paper price tag consumes a lot of time and manpower to replace the price tag, and also promotes dissatisfaction of customers due to mistakes in replacing the price tag, lowering the reliability of the sale of the goods, and the like. Are causing problems.

Therefore, an electronic shelf label system is being developed that can provide accurate information about the exhibited items.

In the electronic price display system, a terminal is installed at a front of a shelf on which predetermined items are displayed, and the terminal communicates with a server through a sink to receive display information such as a product name and a price of the product. Display on the display.

Therefore, according to the display information provided by the server, the terminal can display the display information such as the name and price of the exhibited goods simply and accurately.

On the other hand, the terminal is not supplied with the operating power from the outside, the battery is operated by the power supplied by the battery mounted. The power that the battery can supply is limited.

Therefore, the terminal operates in the sleep mode to minimize the power consumption of the battery, and wakes up at predetermined intervals to communicate with the sink to determine whether the display information is updated or not. When it is necessary to update, it receives the display information from the server through the sink, displays the update, and then operates again in the sleep mode.

The sink communicates with a plurality of terminals set in advance.

Therefore, when one terminal wakes up and communicates with the sink and the other terminal wakes up, the other terminal cannot communicate with the sink and cannot display the display information.

Therefore, the problem to be solved by the present invention is an electronic price display system that allows the terminal to search for the sinks that can communicate, without fixing the sink to communicate, and to update the display information by performing communication with the retrieved sink It provides a method of transmitting sink and display information.

In addition, the present invention provides a display information to be updated to the other terminal when the other terminal that needs to update the display information while the sink communicates with one terminal to update the display information. The present invention provides a method of transmitting sink and display information of an electronic price display system that notifies time information that can be provided so that another terminal can operate in a sleep mode for a time period when another terminal can receive the display information.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above may be clearly understood by those skilled in the art to which the present invention pertains. There will be.

In the sink of the electronic price display system of the present invention, a processor for controlling display and update display of the display information provided by the server, an interface unit for interfacing the processor to communicate with the server, and the server A memory for storing the list of terminals for updating the display information provided under the control of the processor; and when performing data communication with the terminal, the communication is performed through a common channel of a preset frequency under the control of the processor; And a communication module for searching for a data transmission channel and transmitting the display information to the searched data transmission channel when the display information is transmitted to the terminal.

The display information transmission method of the electronic price display system of the present invention includes the steps of the sink receiving and storing a list of a plurality of terminals for which display information should be updated from the server, and when the search message is received from the terminal, Determining whether the display information of the terminal should be updated; requesting and receiving the display information of the terminal from the sink when the display information of the terminal needs to be updated; and receiving the received information. Transmitting display information to the terminal.

The search message is received through a common channel of a preset frequency.

If there is no display information to be updated, the sink generates a response message indicating that there is no display information to be updated and transmits it to the terminal.

The transmitting of the display information may include: generating, by the sink, a response message for notifying update of display information and transmitting the response information to the terminal; and when the display information request message is received from the terminal according to the response message. Transmitting to the terminal.

In the transmission of the display information, the communication module searches for a data transmission channel to which the display information is to be transmitted, transmits the display information to the data transmission channel after transmitting the information to the terminal by including the information of the searched data transmission channel in the response message. do.

If the display information request message is not received within a preset time, the transmission operation of the display information is terminated.

In addition, the display information transmission method of the electronic price display system of the present invention comprises the steps of broadcasting a search message when the terminal wakes up, and receiving a response message transmitted by a plurality of sinks in accordance with the broadcast of the search message And transmitting a display information request message to select and update one sink when it is necessary to determine whether to update the display information through the response message, and to transmit the display information request message according to the display information request message. And receiving, by the terminal, the display information and updating the display information.

The search message, the response message and the indication information request message are transmitted on a common channel of a preset frequency.

The reception of the response message is received for a preset time.

The selection of the sink measures RSSI (Received Signal Strength Indication) when the response message is received, and selects the sink having the largest value of the measured RSSI.

The reception of the indication information is received through a data transmission channel included in the response message.

After the update display of the display information, the terminal operates in the sleep mode.

The terminal operates in the sleep mode when the response message indicates that there is no display information to update.

In addition, the sink of the electronic price display system of the present invention is a processor for controlling the display of the display information provided by the server to update the display, the interface unit for interfacing the processor to communicate with the server, and the server A memory for storing the list of terminals for updating the display information provided by the processor under control of the processor, a first communication module for performing data communication with the terminal on a common channel of a preset frequency under the control of the processor; And a second communication module for searching for a data transmission channel for transmitting display information under control of the processor, and transmitting the display information provided by the processor to the sink through the searched data transmission channel.

In addition, the display information transmission method of the electronic price display system of the present invention, the sink receives and stores a list of a plurality of terminals to be updated the display information from the server, and when the search message is received from the first terminal Determining whether the display information of the first terminal should be updated through a list; and when the display information of the first terminal needs to be updated, the sink requests display information of the first terminal from the server. Generating a response message including a waiting time for the sink to start transmitting the display information to the first terminal, and transmitting the response message to the first terminal; Transmitting the indication information to the first terminal after the elapsed time.

The search message and the response message are transmitted through a common channel of a preset frequency.

If there is no display information to be updated, the sink generates a response message indicating that there is no display information to be updated and transmits the response message to the first terminal.

The waiting time is the time required for the sink to complete the transmission of the indication information to the second terminal.

The display information is transmitted to the terminal when the display information request message is received from the first terminal according to the response message.

In the transmission of the display information, the communication module searches for a data transmission channel to which the display information is to be transmitted, transmits the display information to the data transmission channel after transmitting the information to the first terminal by including the information of the searched transmission channel in the response message. send.

If the display information request message is not received within a preset time, the transmission of the display information ends.

In addition, the display information transmission method of the electronic price display system of the present invention comprises the steps of broadcasting a search message when the terminal wakes up, and receiving a response message transmitted by a plurality of sinks in accordance with the broadcast of the search message And, when it is necessary to determine whether to update the display information through the response message and to update the display information, after operating in the sleep mode for the waiting time in the response message, the user wakes up to select one sink and requests the selected synchro display information. And transmitting, by the terminal, the display information received and updated by the terminal according to the display information request message.

The search message, the response message and the indication information request message are transmitted on a common channel of a preset frequency.

The reception of the response message is received for a preset time.

The selection of the sink selects the sink having the shortest waiting time.

When there are a plurality of sinks having the shortest waiting time, RSSI (Received Signal Strength Indication) when the response message is received is measured, and the sink having the largest RSSI value is selected.

The reception of the indication information is received through a data transmission channel included in the response message.

After the update display of the display information, the terminal operates in the sleep mode.

The terminal operates in the sleep mode when the response message indicates that there is no display information to update.

In the method for transmitting sink and display information of the electronic price display system of the present invention, the terminal does not fix terminals for communicating, and the terminal searches for the sink to communicate with the retrieved sink and updates the display information.

Therefore, the display information of the terminal can be updated and displayed in a short time.

In addition, the terminal may receive a waiting time for receiving display information from the sink and operate in the sleep mode during the waiting time, thereby extending the use time of the battery mounted in the terminal.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

1 is a view showing the overall configuration of an electronic price display system according to the present invention. Here, reference numeral 100 denotes a server. The server 100 provides display information such as a product name and a price of various displayed items.

Reference numeral 110 (110-1, 110-2, ...) denotes a plurality of sinks. The plurality of sinks 110 perform the Ethernet communication or WiFi communication with the server 100 to receive the display information and wirelessly transmit the received display information.

Reference numerals 120-1, 120-2, 120-3, ... denote plural terminals. Each of the plurality of terminals 120 is attached to a shelf or the like on which predetermined items are displayed, and communicates with one sink 110 selected from the plurality of sinks 110 to receive display information. The provided display information is displayed.

In the electronic price display system having such a configuration, each of the plurality of terminals 120 typically has a built-in battery and operates with power supplied by the battery. The power supplied by the battery is limited.

Therefore, the plurality of terminals 120 operate in a sleep mode to minimize power consumption of the battery and periodically operate in a wake-up state.

When the terminal 120 wakes up, the terminal 120 broadcasts a search message to search for a sink 110 capable of communicating with itself.

When the sink 110 capable of communication is found, the terminal 120 receives display information provided by the server 100 through the searched sink 110 and displays the received display information on the display window. After that, the operation is performed in the sleep mode again to minimize the power consumption of the battery.

2 is a view showing the configuration of an embodiment of a sink of the present invention. Here, reference numeral 200 denotes a processor. The processor 200 receives display information from the server 100 and transmits the display information to a predetermined terminal 120.

Reference numeral 210 is an interface unit. The interface unit 210 connects to the server 210 to transmit predetermined data provided by the processor 200 to the server 100, and receives predetermined data provided by the server 100. Input to the processor 200.

Reference numeral 220 is a memory. The memory 220 stores predetermined data including a list of terminals 120 to which display information provided by the server 100 needs to be updated, including an operation program of the processor 200.

Reference numeral 230 is a communication module. The communication module 230 communicates through a common channel of a preset frequency under the control of the processor 200, and transmits the display information to the terminal 120 at a predetermined frequency. Search and transmit display information to the terminal 120 through the searched data transmission channel.

In one embodiment of the sink 110 of the present invention having such a configuration, the processor 200 performs a data communication with the server 100 through the interface unit 210 to list the terminals 120 to update the display information. And stores the received list of terminals 120 in the memory 220.

The processor 200 controls the communication module 230 to perform communication on a common channel having a predetermined frequency, and then determines whether a search message is received from the terminal 120.

When a search message transmitted from the terminal 120 is received through the common channel of the communication module 230, the processor 200 may update the display information through a list stored in the memory 220. 120).

In the case where the terminal 120 needs to update display information as a result of the determination, the processor 200 requests and receives display information to be updated of the terminal 120 from the server 100 through the interface unit 210.

When the display information is received, the processor 200 controls the communication module 230 to search for a data transmission channel for transmitting the display information, and to the corresponding terminal 120 through the searched data transmission channel. Send to update.

3 is a signal flow diagram illustrating an operation of transmitting display information to a terminal by a sink according to an embodiment of the present invention. Referring to FIG. 3, the processor 200 receives a list of terminals 120 to update display information by performing data communication with the server 100 through the interface unit 210, and receives the received terminal 120. The list of these is stored in the memory 220 (S300).

The processor 200 controls the communication module 230 to operate as a common channel of a predetermined frequency (S302), and determines whether a search message for searching for the sink 110 is received from the terminal 200. Judgment (S304)

When the search message is received through the communication module 230, the processor 200 determines the corresponding terminal 120 that transmitted the search message as the received search message (S306), and in the memory 220. The stored list is searched to determine whether the display information of the terminal 120 needs to be updated (S308).

In the case where the terminal 120 does not need to update display information as a result of the determination, the processor 200 generates a response message indicating that it is not necessary to update display information, and generates the generated response message in the communication module 230. S) through the common channel of the terminal 120 to the corresponding terminal 120.

In the case where the terminal 120 needs to update display information as a result of the determination, the processor 200 performs data communication with the server 100 through the interface unit 210 to display the update to the corresponding terminal 120. Request and receive the information (S312), and control the communication module 230 to search the data transmission channel with the display information (S314).

When the search for the data transmission channel is completed, the processor 200 generates a response message including information indicating that there is display information to be updated and frequency information of the searched data transmission channel, and generates the response message. The communication module 230 transmits to the corresponding terminal 120 through the common channel (S316).

The processor 200 determines whether a request message for display information is received from the terminal 120 through a common channel of the communication module 230 (S318), and if the request message for display information is not received. It is determined whether or not the preset time elapses (S320).

If the request message for the display information is not received from the terminal 120 even after the set time elapses as a result of the determination, the processor 200 terminates the operation of updating the display information of the terminal 120.

When the request message for the display information is received from the terminal 120 through the common channel of the communication module 230 before the set time elapses, the processor 200 controls the communication module 230 to control the data. Switch to the transmission channel, and transmit the display information to the terminal 120 through the data transmission channel.

On the other hand, the terminal 120 determines whether or not the wake-up as shown in Figure 4 (S400). That is, the terminal 120 operating with the output power of the battery operates in the sleep mode to minimize the power consumption of the battery, and periodically wakes up to operate normally. Not shown) determines whether terminal 120 has been woken up.

When the terminal 120 wakes up, the terminal 120 broadcasts a search message for searching for the sink 110 (S402). As such, the search message transmitted from the terminal 120 is received by the sink 110 in step S304.

The terminal 120 determines whether a response message is received (S404). That is, as described above, in step S304, the sink 110 receives the search message, and according to the received search message, the response message transmitted in the step S310 or the response message transmitted in the step S316 is Determine whether it is received.

As a result of the determination, when the response message transmitted by the sink 110 is received, the terminal 120 stores the received response message and measures and stores RSSI (Received Signal Strength Indication) which is a reception strength of the response message ( S406). In addition, the terminal 120 determines whether a preset time has elapsed for receiving the response message (S408), and if the set time has not elapsed, the terminal 120 returns to step S404. The operation of determining whether or not a response message is received is repeatedly performed.

When the response message transmitted by the sink 110 is not received as a result of the determination, the terminal 120 determines whether a predetermined time has elapsed for receiving the response message (S408), and the set time has not elapsed. If not, the terminal 120 returns to step S404 and repeatedly determines whether a response message is received.

When the set time has elapsed in such a state, it is determined whether a received response message exists (S410), and if the received response message exists, it is determined whether the display information should be updated through the response message. (S412).

If there is no response message received or if it is not necessary to update the display information as a result of the determination, the terminal 120 operates in the sleep mode to minimize the power consumption of the battery (S422) and performs the update operation of the display information. Quit.

When there is a response message received as a result of the determination and the display information needs to be updated, the terminal 120 determines the RSSI when the response messages are received and the sink 110 corresponding to the RSSI of the greatest strength. ) To be provided with display information (S414).

When the sink 110 is selected, the terminal 120 requests display information to be updated by transmitting a display information request message to the selected sink 110 (S416), and the sink 110 establishes a data transmission channel. Receive display information transmitted through (S418). That is, as described above, the terminal 120 receives the display information transmitted through the data transmission channel in step S324 according to the display information request message received by the sink 110 in step S318.

When the display information is received, the terminal 120 updates and displays the received display information on the display window (S420), operates in the sleep mode (S422), and ends the updating operation of the display information.

According to one embodiment of the present invention, since the sink 110 includes only one communication module 230 to communicate with the terminal 120, the sink 110 may be manufactured at low cost.

5 is a view showing the configuration of another embodiment of the sink of the present invention. Where 500 is a processor. The processor 500 receives the display information from the server 100 and transmits the display information to a predetermined terminal 120.

Reference numeral 510 denotes an interface unit. The interface unit 510 is connected to the server 510 to transmit predetermined data provided by the processor 500 to the server 100, and receives predetermined data provided by the server 100. Input to the processor 500.

Reference numeral 520 is a memory. The memory 520 stores predetermined data including a list of terminals 120 to which display information provided by the server 100 needs to be updated, including an operation program of the processor 200.

Reference numeral 530 denotes a first communication module. The first communication module 530 communicates with the terminal 120 through a common channel of a predetermined frequency.

Reference numeral 540 denotes a second communication module. The second communication module 540 searches for a data transmission channel under the control of the processor 500, and displays display information provided by the processor 500 to the terminal 120 through the searched data transmission channel. send.

In another embodiment of the sink 110 having the above configuration, the processor 500 may perform a data communication with the server 100 through the interface unit 510 to receive a list of terminals 120 to which display information is to be updated. The list of received terminals 120 is stored in the memory 520.

The processor 500 determines whether a search message is received from the terminal 120 through a common channel of the first communication module 530.

When the search message transmitted from the terminal 120 is received through the first communication module 530, the processor 500 may update the display information through a list stored in the memory 520. Judge whether or not).

In the case where the terminal 120 needs to update display information as a result of the determination, the processor 500 requests and receives display information for updating the corresponding terminal 120 from the server 100 through the interface unit 510.

When the display information is received, the processor 500 controls the second communication module 540 to search for a data transmission channel for transmitting the display information, and to the corresponding terminal 120 through the searched data transmission channel. Send display information.

6 is a signal flow diagram illustrating an operation of transmitting display information to a terminal by a sink according to another embodiment of the present invention. Referring to FIG. 6, the processor 500 receives a list of terminals 120 to update display information by performing data communication with the server 100 through the interface unit 510, and receives the received terminal 120. The list of data is stored in the memory 520 (S600).

The processor 500 determines whether a search message for searching for the sink 110 is received from the terminal 500 through the common channel of the first communication module 530 (S602).

When a search message is received through the common channel of the first communication module 530, the processor 500 determines the corresponding terminal 120 that transmitted the search message as the received search message (S604). The list stored in the memory 520 is searched to determine whether the display information of the terminal 120 needs to be updated (S606). For example, the received search message is transmitted by the terminal 120-1 to determine whether the display information of the terminal 120-1 should be updated.

In the case where the terminal 120-1 does not need to update the display information as a result of the determination, the processor 500 generates a response message indicating that the display information does not need to be updated, and generates the response message. The common module of the communication module 530 transmits to the corresponding terminal 120-1 (S608).

In the case where the terminal 120-1 needs to update display information as a result of the determination, the processor 500 performs data communication with the server 100 through the interface unit 510 to transmit the data to the corresponding terminal 120-1. Request and receive display information to be updated (S610).

The processor 500 determines whether the display information is currently being transmitted to the other terminal 120 (S612).

If it is determined in step S612 that the display information is not transmitted to the other terminal 120, the processor 500 controls the second communication module 540 to search for a data transmission channel for transmitting the display information (S612). In operation S 614, a response message is generated and transmitted to the terminal 120-1 through the common channel of the first communication module 530 in operation S 616.

When the display information is transmitted to a predetermined terminal 120, for example, the terminal 120-1, the processor 500 immediately generates a response message to generate the first message. The communication module 530 transmits the data to the terminal 120-1 through the common channel (S616).

In this case, the response message includes information indicating that there is display information to be updated, frequency information of the searched data transmission channel, and information such as waiting time until transmission of the display information is transmitted. If not, the waiting time is set to '0', and when the display information is being transmitted to the terminal 120-1, the waiting time is set to the time until the transmission of the display information is completed.

In this state, the processor 500 determines whether the transmission of the display information is completed (S618), and if the display information request message is received from the terminal 120-1 when the transmission of the display information is completed. In operation S620, when the display information request message is not received, it is determined whether a preset time elapses (SS622).

If the request message for the display information is not received from the terminal 120-1 even after the set time elapses, the processor 500 terminates the operation of updating the display information of the terminal 120-1. .

When the request message for the display information is received from the terminal 120-1 through the common channel of the first communication module 530 before the set time has elapsed, the processor 500 includes the second communication module ( In operation S24, the control information 540 is transmitted to the terminal 120-1 through the data transmission channel.

On the other hand, the terminal 120 determines whether or not the wake-up as shown in Figure 7 (S700). That is, the terminal 120 operating with the output power of the battery operates in the sleep mode to minimize the power consumption of the battery, and periodically wakes up to operate normally. Not shown) determines whether terminal 120 has been woken up.

When the terminal 120 wakes up, the terminal 120 broadcasts a search message for searching for the sink 110 (S702). As such, the search message transmitted from the terminal 120 is received by the sink 110 in step S602.

The terminal 120 determines whether a response message is received from the sink 110 (S704). That is, as described above, the sink 110 receives the search message in step S602, and determines whether the response message transmitted in the step S616 is received according to the received search message.

As a result of the determination, when the response message transmitted by the sink 110 is received, the terminal 120 stores the received response message and measures and stores RSSI (Received Signal Strength Indication) which is a reception strength of the response message ( S706). In addition, the terminal 120 determines whether a preset time has elapsed to receive the response message (S708). If the set time has not elapsed, the terminal 120 returns to the step S704. The operation of determining whether or not a response message is received is repeatedly performed.

When the response message transmitted by the sink 110 is not received as a result of the determination, the terminal 120 determines whether a preset time has elapsed for reception of the response message (S708), and the set time has elapsed. If not, the terminal 120 returns to step S704 and repeatedly determines whether a response message is received.

When the set time has elapsed in such a state, it is determined whether a received response message exists (S710), and if the received response message exists, it is determined whether the display information should be updated through the response message. (S712).

If there is no response message received or if it is not necessary to update the display information as a result of the determination, the terminal 120 operates in the sleep mode to minimize the power consumption of the battery (S730) and performs the update operation of the display information. Quit.

When there is a response message received as a result of the determination and the display information needs to be updated, the terminal 120 determines whether there is a sink 110 having no waiting time in the received response message (S714). If there is no sink 110 without a waiting time, one sink 110 having the shortest waiting time is selected (S716).

When the one sink 110 is selected, the terminal 120 operates in the sleep mode for a time in which the preset threshold time is added to the standby time of the sink 110 (S718), and the time of the sleep mode has elapsed. In operation S720, it is determined whether the user wakes up.

If there is a sink 110 having no waiting time as a result of the determination in step S714, the RSSI is determined to select one sink 110 having the largest RSSI (S722).

In this state, the terminal 120 transmits a display information request message to the selected sink 110 to request display information to be updated (S724), and the display information transmitted by the sink 110 through a data transmission channel. It receives (S726). That is, as described above, the terminal 120 receives the display information transmitted through the data transmission channel in step S624 according to the display information request message received by the sink 110 in step S620.

When the display information is received, the terminal 120 updates and displays the received display information on the display window (S728), operates in the sleep mode (S730), and ends the updating operation of the display information.

According to another exemplary embodiment of the present invention, since the sink 110 includes a first communication module 530 that communicates through a common channel and a second communication module 540 that transmits display information through a data transmission channel, the sink 110 is described above. Compared to one embodiment, the manufacturing cost of the sink 110 is increased.

However, even when the sink 110 transmits the display information to one terminal 120, the sink 110 may communicate with other terminals 120 except for the terminal 120 which transmits the display information. Information such as waiting time can be informed.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. This will harm.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

The present invention relates to a method of transmitting sinks and display information in an electronic price display system.

1 is a view showing the overall configuration of an electronic price display system according to the present invention,

2 is a view showing the configuration of an embodiment of a sink of the present invention,

3 is a signal flow diagram illustrating an operation of transmitting display information to a terminal by a sink according to an embodiment of the present invention;

4 is a signal flow diagram illustrating an operation of a terminal receiving display information through a sink according to an embodiment of the present invention;

5 is a view showing the configuration of another embodiment of the sink of the present invention,

6 is a signal flow diagram illustrating an operation of transmitting display information to a terminal by a sink according to another embodiment of the present invention;

7 is a signal flow diagram illustrating an operation of a terminal receiving display information through a sink according to another embodiment of the present invention.

Claims (30)

A processor for controlling updating and displaying of display information provided by a server to a terminal; An interface unit for interfacing the processor to communicate with the server; A memory configured to store the list of terminals for updating display information provided by the server under the control of the processor; And In the case of performing data communication with the terminal, communication is performed through a common channel of a preset frequency under control of the processor, and when the display information is transmitted to the terminal, the data transmission channel is searched under the control of the processor. And a communication module for transmitting the display information to the searched data transmission channel. Receiving and storing, by the sink, a list of a plurality of terminals whose display information is to be updated from the server; Determining whether the display information of the terminal should be updated through the list when a search message is received from the terminal; When the display information of the terminal needs to be updated, the sink requesting and receiving the display information of the terminal from the server; And And transmitting the received display information to the terminal. The method of claim 2, wherein the search message; Display information transmission method of the electronic price display system received through a common channel of a predetermined frequency. 3. The method of claim 2, further comprising: when there is no display information to update; Generating a response message indicating that there is no display information to be updated by the sink and transmitting the generated response message to the terminal. The method of claim 2, wherein the transmitting of the display information comprises: Generating, by the sink, a response message notifying update of display information and transmitting the response message to the terminal; And And transmitting the display information to the terminal when the display information request message is received from the terminal according to the response message. The method of claim 5, wherein the transmission of the display information; The electronic module of the electronic price display system searches for a data transmission channel through which the communication module transmits the display information, transmits the display information to the data transmission channel after including the information on the searched data transmission channel in the response message. Display Information Transmission Method. 6. The method of claim 5, wherein the indication information request message is not received within a preset time; A display information transmission method of an electronic price display system which terminates a transmission operation of display information. Broadcasting a search message when the terminal wakes up; Receiving a response message transmitted by a plurality of sinks according to broadcasting of the search message; Transmitting a display information request message to select and update one sink when it is necessary to determine whether to update the display information through the response message; And And displaying, by the terminal, display information transmitted by the sink according to the display information request message and updating the display information. The method of claim 8, wherein the search message, the response message and the indication information request message; Display information transmission method of the electronic price display system is transmitted to a common channel of a predetermined frequency. 9. The method of claim 8, wherein receiving the response message comprises: Display information transmission method of the electronic price display system for receiving for a predetermined time. The method of claim 8, wherein the selection of the sink; Received Signal Strength Indication (RSSI) is measured when the response message is received, and the display information transmission method of the electronic price display system for selecting the sink having the largest value of the RSSI. The method of claim 8, wherein the reception of the display information; Display information transmission method of the electronic price display system for receiving on the data transmission channel included in the response message. 9. The apparatus of claim 8, further comprising: after an update display of the display information; Display information transmission method of the electronic price display system in which the terminal operates in a sleep mode. 9. The method of claim 8, further comprising: when the response message indicates that there is no indication information to update; Display information transmission method of the electronic price display system in which the terminal operates in a sleep mode. A processor for controlling updating and displaying of display information provided by a server to a terminal; An interface unit for interfacing the processor to communicate with the server; A memory configured to store the list of terminals for updating display information provided by the server under the control of the processor; A first communication module configured to perform data communication with the terminal through a common channel of a preset frequency under the control of the processor; And A second communication module for searching for a data transmission channel for transmitting display information under control of the processor, and transmitting the display information provided by the processor to the sink through the searched data transmission channel. Sink. Receiving and storing, by the sink, a list of a plurality of terminals whose display information is to be updated from the server; Determining whether the display information of the first terminal should be updated through the list when a search message is received from the first terminal; Requesting, by the sink, display information of the first terminal from the server when the display information of the first terminal needs to be updated; And Generating a response message including a waiting time for the sink to start transmitting the indication information to the first terminal and transmitting the response message to the first terminal; And And transmitting, by the sink, the display information to the first terminal after the waiting time has elapsed. 17. The method of claim 16, wherein the search message and the response message; Display information transmission method of the electronic price display system transmitted through a common channel of a predetermined frequency. 17. The apparatus of claim 16, further comprising: when there is no display information to update; And generating a response message indicating that there is no display information to be updated by the sink, and transmitting the generated response message to the first terminal. The method of claim 16, wherein the waiting time; The display information transmission method of the electronic price display system which is a time required until the sink completes the transmission of the display information to the second terminal. The method of claim 16, wherein the transmission of the display information; And transmitting the display information to the terminal when a display information request message is received from the first terminal according to the response message. The method of claim 16, wherein the transmission of the display information; The electronic price display system which searches the data transmission channel to which the communication module transmits the display information, includes the information of the searched transmission channel in the response message, transmits the information to the first terminal, and then transmits the display information to the data transmission channel. How to send display information 17. The method of claim 16, wherein the indication information request message is not received within a preset time; A display information transmission method of an electronic price display system which terminates a transmission operation of display information. Broadcasting a search message when the terminal wakes up; Receiving a response message transmitted by a plurality of sinks according to broadcasting of the search message; If it is necessary to determine whether or not to update the display information through the response message, the device operates in the sleep mode during the waiting time in the response message and then wakes up to select one sink, and then selects one selected synchro indication information request message. Transmitting; And And displaying, by the terminal, display information transmitted by the sink according to the display information request message and updating the display information. The method of claim 23, wherein the search message, the response message and the indication information request message; Display information transmission method of the electronic price display system is transmitted to a common channel of a predetermined frequency. 24. The method of claim 23, wherein receiving the response message is; Display information transmission method of the electronic price display system for receiving for a predetermined time. The method of claim 23, wherein the selection of the sink; Display information transmission method of the electronic price display system for selecting the sink having the shortest waiting time. 27. The method of claim 26, further comprising: when there are a plurality of sinks having the shortest waiting time; Received Signal Strength Indication (RSSI) is measured when the response message is received, and the display information transmission method of the electronic price display system for selecting the sink having the largest value of the RSSI. The method of claim 23, wherein the reception of the display information; Display information transmission method of the electronic price display system for receiving on the data transmission channel included in the response message. 24. The apparatus according to claim 23, further comprising: after an updated display of the display information; Display information transmission method of the electronic price display system in which the terminal operates in a sleep mode. 24. The method of claim 23, further comprising: when the response message indicates that there is no indication information to update; Display information transmission method of the electronic price display system in which the terminal operates in a sleep mode.

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