JP2014178850A - Electronic shelf label system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic shelf label system that suppresses wasteful power consumption, and curbs battery consumption.SOLUTION: An electronic shelf label system comprises: an electronic shelf label that indicates commercial article information and is disposed in association with a commercial article; a server that stores association information between the commercial article information and the electronic shelf label; and a communication device that transmits an infrared-ray signal including the commercial article information to the association information. An electronic shelf label includes a detection part that detects a voltage of a capacitor, and a charge process part that performs charge of the capacitor on the basis of a voltage detected by the detection part. When the voltage of the capacitor of the electronic shelf label in an active mode capable of receiving the infrared-ray is lower than a predetermined threshold value, the charge of the capacitor is performed.

Description

  The present invention relates to an electronic shelf label system.

  In recent years, electronic shelf label systems have been adopted in stores such as supermarkets and convenience stores. In the electronic shelf label system, information (product information) about a plurality of products handled is centrally managed by a server. The server is arranged in the store backyard. The merchandise information is displayed on the electronic shelf label. Electronic shelf labels are provided at store sales floors. The electronic shelf label is arranged in association with each of a plurality of products at the sales floor. The electronic shelf label is a display device that is driven by a battery and a capacitor as disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-516430. The capacitor stores the power supplied by the battery. In the electronic shelf label system, when the product information managed by the server is updated, a command (update command) including product information from the server to the electronic shelf label is reflected in order to reflect the update on the electronic shelf label. Sent. When receiving the update command, the electronic shelf label updates the display content of the electronic shelf label based on the update command.

  By the way, in the electronic shelf label system as shown in Patent Document 1, generally, when the product information is updated by the server, the server sends an update command including the updated product information to the electronic shelf label. Then, a wake-up signal is transmitted to the electronic shelf label. Thereafter, the server transmits an update command to the electronic shelf label with the device ID of the electronic shelf label to be updated. The electronic shelf label is switched between a sleep mode and an active mode at a predetermined time interval (for example, every second) in order to suppress power consumption. When the electronic shelf label receives a wake-up signal from the server when the active mode is set, the electronic shelf label waits in the active mode until an update command is transmitted from the server. When the electronic shelf label receives an update command with the same device ID as its own device ID from the server, the electronic shelf label transmits a response signal indicating that the update command has been received to the server. Switch to On the other hand, if the electronic shelf label does not receive a wakeup signal in the active mode, or after receiving the wakeup signal, the electronic shelf label must receive an update command with the same device ID as its own device ID. After that, the mode is switched to the sleep mode.

  Here, since the electronic shelf label proposed in Patent Document 1 stores electric power necessary for transmission of the response signal, charging of the capacitor is started at the timing when the wake-up signal from the server is detected. That is, even when the electronic shelf label does not transmit a response signal to the server for some reason, the capacitor charging process is started. As a result, wasteful current consumption occurs in the electronic shelf label.

  An object of the present invention is to provide an electronic shelf label system that suppresses wasteful current consumption and suppresses battery consumption.

  An electronic shelf label system according to the present invention includes an electronic shelf label, a server, and a communication device. The electronic shelf label is arranged in association with the product. The electronic shelf label displays product information related to the associated product. The server stores association information between product information and electronic shelf labels. The communication device transmits an infrared signal including product information to the electronic shelf label based on the association information of the server. The electronic shelf label includes a reception unit, a transmission unit, a battery, a capacitor, a detection unit, and a charging process execution unit. The receiving unit receives an infrared signal transmitted from the communication device. When the infrared signal is received by the reception unit, the transmission unit transmits a response signal toward the server. The battery is a power source. The capacitor stores electric power supplied from the battery. The detection unit detects the voltage of the capacitor. The charging process execution unit performs the capacitor charging process based on the capacitor voltage detected by the detection unit.

  In the electronic shelf label system according to the present invention, the capacitor charging process is performed based on the capacitor voltage detected by the detector. Thereby, consumption of the battery can be suppressed.

  The detection unit detects the voltage of the capacitor at the first predetermined time interval, and the charging process execution unit performs the capacitor charging process when the voltage of the capacitor detected by the detection unit is lower than a predetermined threshold. It is preferable to carry out. Thereby, useless charging processing can be suppressed.

  Moreover, it is preferable that a charge process execution part performs the charge process of a capacitor | condenser further, after the response signal toward a server is transmitted by the response signal transmission part. As a result, even when the voltage of the capacitor is reduced by the voltage detection timing and the voltage is insufficient when the response signal is transmitted, the response signal can be transmitted to the infrared signal transmitted from the server thereafter. .

  Moreover, it is preferable that an electronic shelf label further has a mode setting part. The mode setting unit alternately sets the active mode and the sleep mode. The mode setting unit sets the active mode at the second predetermined time interval. The second predetermined time interval is a time interval shorter than the first predetermined time interval. The active mode is a mode in which an infrared signal can be received. The sleep mode is a mode in which an infrared signal cannot be received. The charging process execution unit performs the capacitor charging process after the active mode is set by the mode setting unit and when the voltage of the capacitor lower than the predetermined threshold is detected by the detection unit. Is preferred. As a result, when the active mode is set, the charging process can be performed only for the capacitors that require the charging process. As a result, wasteful current consumption can be suppressed.

  Moreover, it is preferable that a charge process execution part performs a capacitor | condenser charge process according to the timing when an active mode is set by the mode setting part. Thereby, power consumption can be suppressed more effectively.

  The electronic shelf label system according to the present invention can suppress wasteful current consumption and suppress battery consumption.

It is a figure which shows the electronic shelf label system which concerns on one Embodiment of this invention. It is a block diagram which shows schematic structure of an ESL server. It is a figure which shows the example of a goods master table. It is a figure which shows the example of an ESL master table. It is a figure which shows the external appearance of ESL. It is a block diagram which shows schematic structure of ESL. It is a figure which shows the flow of a voltage detection process. It is a figure which shows the flow of a command reception process. It is a figure which shows the flow of a voltage detection timer process.

  Hereinafter, an electronic shelf label system 1 according to an embodiment of the present invention will be described with reference to the drawings.

(1) Overall Configuration FIG. 1 shows an electronic shelf label system 1 according to the present invention. The electronic shelf label system 1 is a system that collectively manages data relating to product ordering, production, sales, price, and the like in stores such as supermarkets and convenience stores.

  As shown in FIG. 1, an electronic shelf label system 1 mainly includes a plurality of ESL (electronic shelf labels) 40, 40,..., An ESL server (server) 10, a base station (communication device) 20, It comprises a plurality of transceivers (communication devices) 30, 30,. The numbers of ESLs 40, base stations 20, and transceivers 30 included in the electronic shelf label system 1 are not limited to the numbers shown in FIG.

  The ESL 40 is a display device that is arranged in association with each of a plurality of products handled in a store. ESL40 is arrange | positioned in the vicinity of the matched goods among the several goods displayed at the sales floor of a store, and displays the merchandise information which concerns on the matched goods (refer FIG. 5).

  The ESL server 10 is a general computer that centrally manages information on a plurality of products handled in a store. The ESL server 10 is disposed in a store backyard or the like. Further, the ESL server 10 manages display contents of the plurality of ESLs 40. Specifically, when the product information to be managed is updated, the ESL server 10 generates a command to be transmitted to the ESL 40 in order to update the product information to be displayed on the ESL 40. The command is a signal that instructs the ESL 40 to execute various processes. The command includes information necessary for processing to be executed by the ESL 40. For example, the information included in the command includes product information (for example, image information) to be displayed on the ESL 40 screen. In addition, an identifier of an ESL (target ESL) that is a target for executing the command is added to the command. The ESL 40 and the ESL server 10 exchange signals via the base station 20 and the transceiver 30.

  The base station 20 has a function of relaying between the ESL server 10 and the transceiver 30. The base station 20 is connected to the ESL server 10 and the transceiver 30 via a dedicated communication cable 2. The transceiver 30 is a transceiver. Specifically, the transceiver 30 has both a transmission function to the ESL 40 and a reception function of a response signal sent from the ESL 40. More specifically, the transceiver 30 transmits a signal transmitted from the ESL server 10 to each ESL 40 by radio using infrared rays or the like. That is, the transceiver 30 transmits an infrared signal including product information to the ESL 40. Further, the transceiver 30 receives a response signal sent from the ESL 40 and sends it to the ESL server 10. For example, the transceiver 30 is attached to each section in the store (for example, the ceiling) at a certain interval. Each transceiver 30 forms a communication area. The transceiver 30 transmits a wake-up signal to the ESL 40 before transmitting the command generated in the ESL server 10 to the ESL 40.

  When a command is generated in the ESL server 10, the ESL server 10 transmits the command to the ESL 40 via the base station 20 and the transceiver 30. When each ESL 40 detects a command transmitted from the ESL server 10, the ESL 40 compares an identifier added to the command (additional identifier) with a unique identifier (unique identifier) that each ESL 40 has. Each ESL 40 receives a command when the additional identifier and the unique identifier are the same, and updates the product information displayed on the screen based on the command. That is, the ESL 40 updates or changes the display content in accordance with the command sent from the ESL server 10.

  Hereinafter, the configurations of the ESL server 10 and the ESL 40 will be described in detail.

(2) ESL server As described above, the ESL server 10 centrally manages product information on a plurality of products handled in a store. That is, the ESL server 10 stores various types of information related to all products handled in the store. As described above, the ESL server 10 is installed in a store backyard or the like. The ESL server 10 is a device in which software for controlling the electronic shelf label system 1 is installed in a computer such as a workstation or a personal computer. The ESL server 10 generates a command for instructing display of merchandise information or updating of merchandise information, and transmits the command to all ESLs 40 in the store or one of the ESLs 40.

  As shown in FIG. 2, the ESL server 10 mainly includes a communication unit 11, a display unit 12, an input unit 13, an output unit 14, and a control device 15.

(2-1) Communication Unit The communication unit 11 is a communication interface for enabling communication with the base station 20. The command sent from the communication unit 11 to the base station 20 further reaches the ESL 40 via the transceiver 30.

(2-2) Display unit The display unit 12 includes a liquid crystal display.

(2-3) Input unit The input unit 13 includes a mouse and a keyboard.

(2-4) Output unit The output unit 14 is a printer. The output unit 14 outputs a summary result of various data in the ESL server 10.

(2-5) Control Device The control device 15 includes a CPU, a ROM, a RAM, and a hard disk, and functions as the storage unit 51 and the control unit 52.

(2-5-1) Storage Unit The storage unit 51 stores a control program to be executed by the control unit 52 described later. As shown in FIG. 2, the storage unit 51 mainly stores a product master table 51a and an ESL master table 51b.

(A) Product Master Table The product master table 51 a stores information (product information) related to products handled by the electronic shelf label system 1. The product information is basic information about the product (for example, the name of the product to be handled, the product code, etc.). Image information to be displayed on the ESL 40 is created based on the product information stored in the product master table 51a.

  Specifically, FIG. 3 shows an example of product information stored in the product master table 51a. In the product master table 51a, for example, various information such as product name, product ID, unit price (normal unit price / reduction price), price (normal price / reduction price), expiration date, place of origin, and raw materials / additives are stored in association with each other. Has been.

(B) ESL Master Table The ESL master table 51b stores basic information regarding all the ESLs 40 arranged in the electronic shelf label system 1. The basic information is basic information related to the ESL 40 and is information input in advance by the operator. In the basic information, as shown in FIG. 4, a device ID, a product ID, a product name, and the like are stored. Here, the device ID is an identifier unique to each ESL 40. In other words, the device ID is a hardware ID unique to each of all the ESLs 40. The product ID and the product name are the ID and name of the product associated with the ESL 40. That is, in the ESL master table 51b, the device ID of the ESL 40, the product ID, and the product name are stored in association with each other. In other words, the ESL master table 51b stores association information between product information and ESL. Although not shown, other information (for example, performance of each ESL 40) may be stored in the ESL master table 51b.

(2-5-2) Control Unit The control unit 52 performs various controls based on programs and various information stored in the storage unit 51. Further, as shown in FIG. 2, the control unit 52 functions as an information reception unit 52a, a command generation unit 52b, an information transmission unit 52c, and a response signal reception unit 52d.

(A) Information receiving unit The information receiving unit 52a receives various information input via the input unit 13. The various information received by the information receiving unit 52a includes, for example, product information (new information / update information), basic information of the ESL 40, and the like. Various types of information received by the information receiving unit 52a are stored in the storage unit 51.

(B) Command Generation Unit The command generation unit 52b generates a command to be transmitted to the ESL 40 based on a command input from the operator via the input unit 13 or a program stored in the storage unit 51. To do. The command generated by the command generation unit 52b includes an update command. The update command is a command for instructing update of display contents of the ESL 40. The update command includes product information (image information or the like) to be displayed on the ESL 40 screen.

(C) Information transmission unit The information transmission unit 52c transmits the command generated by the command generation unit 52b to the ESL 40. Based on the association information stored in the ESL master table 51b, the information transmission unit 52c transmits a command with an identifier (device ID) unique to the destination ESL 40. Specifically, the information transmission unit 52c transmits a command following the device ID of the ESL 40 that is a target for executing the command.

  The information transmission unit 52c retransmits a command when a response signal is not received within a predetermined time by a response signal reception unit 52d described later. The command retransmission is repeated a predetermined number of times.

(D) Response signal receiving unit The response signal receiving unit 52d receives a response signal transmitted from the ESL 40. Specifically, the response signal receiving unit 52 d receives the response signal transmitted from the ESL 40 via the transceiver 30 and the base station 20.

  The response signal receiving unit 52d waits to receive a response signal sent from the ESL 40 for a predetermined time (for example, 1 second) after the command to the ESL 40 is transmitted by the information transmitting unit 52c. When the response signal receiving unit 52d receives a response signal within a predetermined time, the response signal receiving unit 52d stores that fact in the storage unit 51. On the other hand, if the response signal receiving unit 52d does not receive the response signal within a predetermined time, the response signal receiving unit 52d instructs the information transmitting unit 52c to retransmit the command. If the response signal is not received even though the information transmission unit 52c has retransmitted the command a predetermined number of times, the response signal reception unit 52d stores this in the storage unit 51.

(3) ESL
ESL40 is a terminal for displaying merchandise information, as shown in FIG. As described above, the ESL 40 is arranged in association with each of a plurality of products handled at the store, and displays product information related to the associated products. ESL40 is arrange | positioned in the vicinity of the matched goods. The product information displayed on the ESL 40 includes a product name, a unit price, a price, a barcode, and the like as shown in FIG.

  As shown in FIG. 6, the ESL 40 mainly includes a communication unit (reception unit / transmission unit) 41, a display unit 42, a battery 43, a capacitor 44, and a control device 45.

(3-1) Communication Unit The communication unit 41 enables communication with the transceiver 30 and an external terminal (for example, a mobile terminal (not shown)). Specifically, the communication unit 41 functions as a receiving unit that receives infrared rays transmitted from the transceiver 30 and transmission of infrared rays transmitted from an external terminal in accordance with transmission of a command by the ESL server 10.

  The communication unit 41 also functions as a transmission unit that transmits infrared rays related to the response signal to the ESL server 10. Here, the response signal is a signal for notifying reception of a command sent from the ESL server 10, and is transmitted by a response signal transmission unit 45b described later. That is, the response signal transmitted by the response signal transmission unit 45 b is sent to the transceiver 30 via the communication unit 41.

  In addition, the communication part 41 is provided in the frame 40a of ESL40, as shown in FIG.

(3-2) Display part The display part 42 comprises the screen which displays the information regarding goods. The display unit 42 is made of dot matrix type electronic paper. That is, the display unit 42 is a non-volatile display unit including a plurality of pixels arranged in a matrix. The display unit 42 does not require driving power to maintain display contents.

  The display unit 42 displays the product information based on the command sent from the ESL server 10. Further, the content displayed on the display unit 42 is updated based on the command.

(3-3) Battery and Capacitor The battery 43 is a power source of the ESL 40. The battery 43 is provided inside the frame body 40a. The capacitor 44 stores the power supplied from the battery 43. The capacitor 44 stores power boosted by a booster circuit provided in the control device 45 described later. The electric power stored in the capacitor 44 is used when a response signal is transmitted by a response signal transmission unit 45b described later.

(3-4) Control Device The control device 45 includes a CPU, a ROM, and a RAM. The control device 45 is provided with a booster circuit, a charging circuit, etc. (not shown). In addition to a program for managing the screen of the ESL 40, the control device 45 stores an identifier (device ID) unique to each ESL 40, image information, and the like. Here, the image information stored in the control device 45 is image information included in the most recently received command. When a new command is received, the image information stored in the control device 45 is overwritten by the image information included in the new command.

  Based on the program stored in the ROM, the control device 45 includes an information receiving unit 45a, a response signal transmitting unit 45b, a display content updating unit 45c, a mode setting unit 45d, a detection flag setting unit 45e, a first timer unit 45f, a first timer unit 45f, 2 functions as a timer unit 45g, a voltage detection unit (detection unit) 45h, and a charging process execution unit 45i.

(3-4-1) Information Receiving Unit The information receiving unit 45a receives a command transmitted from the ESL server 10 via the communication unit 41. Specifically, the information receiving unit 45a detects an infrared signal (wake-up signal) sent from the transceiver 30. When the wakeup signal is detected by the information receiving unit 45a, the ESL 40 stands by in the active mode. Thereafter, the information receiving unit 45a compares the identifier (addition identifier) added to the infrared signal (command) sent from the transceiver 30 with the identifier (unique identifier) unique to each ESL 40 stored in the control device 45. . Here, only when the additional identifier matches the unique identifier, the information receiving unit 45a receives a command. Thereafter, the information receiving unit 45a stores information included in the command.

(3-4-2) Response Signal Transmitter The response signal transmitter 45b transmits a response signal (Ack) to the ESL server 10 when a command is received by the information receiver 45a. The response signal is a signal indicating that a command has been received. The response signal transmitted by the response signal transmission unit 45 b is transmitted to the transceiver 30 by infrared rays via the communication unit 41, and then transmitted to the ESL server 10 via the transceiver 30.

(3-4-3) Display Content Update Unit The display content update unit 45c updates (changes) the content displayed on the display unit (screen) 42 based on the command received by the information receiving unit 45a. Specifically, the display content update unit 45c updates the display content based on the stored image information. That is, the display content update unit 45c clears the old image information previously displayed on the screen based on the new image information.

(3-4-4) Mode setting unit The mode setting unit 45d switches the operation mode. Here, the operation mode includes an active mode and a sleep mode. The mode setting unit 45d alternately sets the active mode and the sleep mode. The mode setting unit 45d switches between the sleep mode and the active mode at a predetermined time interval.

  Here, the active mode is a mode in which a command from the ESL server 10 can be received. That is, when the active mode is set by the mode setting unit 45d, the ESL 40 can receive an infrared signal transmitted from the transceiver 30. The sleep mode is a mode in which a command from the ESL server 10 cannot be received. That is, when the sleep mode is set by the mode setting unit 45d, the ESL 40 cannot receive the infrared signal transmitted from the transceiver 30. The ESL 40 is in the active mode when receiving a command from the ESL server 10 and when updating the display content according to the command, and stands by in the sleep mode otherwise.

  Specifically, the mode setting unit 45d switches the operation mode so that the active mode is set at a predetermined time interval (second predetermined time interval) (for example, approximately every 1 second). Specifically, the mode setting unit 45d sets the next active mode after a second predetermined time (for example, about 1 second) has elapsed from the timing when the active mode was previously set. The mode setting unit 45d switches the operation mode to the sleep mode after continuing the active mode for a third predetermined time (for example, about 1 millisecond). Note that the predetermined time interval (second predetermined time interval) at which the operation mode is switched by the mode setting unit 45d is the time interval (first predetermined time) at which the detection flag is set by the detection flag setting unit 45e described later. Time interval shorter than (interval).

(3-4-5) Detection flag setting unit The detection flag setting unit 45e sets a detection flag. The detection flag is a flag used for causing a voltage detection unit 45h described later to execute a voltage detection process. Specifically, the detection flag setting unit 45e executes a process of setting a detection flag at a predetermined time interval (first predetermined time) (for example, every hour). The voltage detection unit 45h described later executes a voltage detection process at a timing when the detection flag is set by the detection flag setting unit 45e and set to the active mode by the mode setting unit 45d described above. The detection flag setting unit 45e lowers the detection flag after the voltage detection processing is executed by the voltage detection unit 45h.

(3-4-6) First timer unit The first timer unit 45f counts a predetermined time in order to obtain timing for switching the operation mode by the mode setting unit 45d. In other words, the first timer unit 45f is set to obtain timings for switching the sleep mode to the active mode and timings for switching the active mode to the sleep mode.

  Specifically, the first timer unit 45f starts counting the second predetermined time at the timing when the active mode is set. Here, the second predetermined time is, for example, about 1 second as described above. The first timer unit 45f starts counting the third predetermined time at the timing when the active mode is set. Here, as described above, the third predetermined time is, for example, about 1 millisecond.

  The first timer unit 45f stops counting the third predetermined time when the information reception unit 45a detects the wakeup signal. Specifically, the first timer unit 45f until the information receiving unit 45a determines that the additional identifier and the unique identifier are different, or until the command is executed when it is determined that the additional identifier and the unique identifier match. Then, the counting of the third predetermined time is stopped. Thereafter, the first timer unit 45f resets the count of the third predetermined time, and starts counting the third predetermined time at the timing when the next active mode is set.

(3-4-7) Second Timer Unit The second timer unit 45g has a predetermined time (a predetermined time) so that the detection flag is set by the detection flag setting unit 45e at a predetermined time interval (first predetermined time interval). 1st predetermined time) is counted. In other words, the second timer unit 45g is set to obtain a timing for setting a detection flag (that is, a voltage detection timing). The second timer unit 45g starts counting a predetermined time (first predetermined time) at the timing when the flag is cleared by the detection flag setting unit 45e. Here, the predetermined time is, for example, one hour.

(3-4-8) Voltage Detection Unit The voltage detection unit 45h detects the voltage of the capacitor 44 at the first predetermined time interval. Specifically, the voltage detection unit 45h detects the voltage of the capacitor 44 when the detection flag is set by the detection flag setting unit 45e and the active mode is set by the mode setting unit 45d described above. In other words, if the detection flag is set when the voltage detection unit 45h is set to the active mode, the voltage detection process is performed.

  The voltage detection unit 45h determines whether the detected voltage of the capacitor 44 is lower than a predetermined threshold value. Here, the predetermined threshold value is an arbitrary value and is a voltage value at which the response signal can be transmitted once. That is, the predetermined threshold value may be different for each ESL 40. A comparison result between the voltage of the capacitor 44 and a predetermined threshold value by the voltage detection unit 45 h is stored in the control device 45.

(3-4-9) Charging Process Execution Unit The charging process execution unit 45i performs the charging process for the capacitor 44 in accordance with the timing when the active mode is set by the mode setting unit 45d. In other words, the charging process execution unit 45i performs the charging process of the capacitor 44 when the active mode is set by the mode setting unit 45d. The charging process execution unit 45i temporarily switches the charging circuit switch from OFF to ON.

  The charging process includes a post-response charging process and a pre-response charging process. The post-response charging process is a charging process executed after transmitting a response signal. The pre-response charging process is a charging process that is executed before a response signal is transmitted.

  Based on the voltage of the capacitor 44 detected by the voltage detection unit 45h, the charging process execution unit 45i executes a post-response charging process, or a post-response charging process and a pre-response charging process. In other words, the charging process execution unit 45i executes the pre-response charging process in addition to the post-response charging process based on the comparison result between the voltage of the capacitor 44 and the predetermined threshold value by the voltage detection unit 45h.

  Specifically, the charging process execution unit 45i determines that the voltage of the capacitor 44 detected by the voltage detection unit 45h is equal to or higher than a predetermined threshold when the detection flag is not set or even when the detection flag is set. In this case, only the post-response charging process is executed. That is, the charging process execution unit 45i executes the charging process after transmitting the response signal.

  On the other hand, when the detection flag is set and the voltage of the capacitor 44 detected by the voltage detection unit 45h is lower than a predetermined threshold, the charging process execution unit 45i responds in addition to the post-response charging process. Perform pre-charge processing. Specifically, when the voltage detection unit 45h detects a voltage of a capacitor lower than a predetermined threshold when the mode setting unit 45d sets the active mode, the charging process execution unit 45i displays the response signal transmission unit 45b. Is executed before the response signal directed to the ESL server 10 is transmitted, and then the response signal directed to the ESL server 10 is transmitted by the response signal transmitting unit 45b, The capacitor 44 is charged (after-response charging).

(4) Processing in ESL Next, the flow of processing in the ESL 40 will be described with reference to FIGS. FIG. 7 shows the flow of voltage detection processing. FIG. 8 shows the flow of command reception processing. FIG. 9 shows the flow of the voltage detection timer process.

(4-1) Voltage Detection Processing First, the flow of voltage detection processing will be described with reference to FIG.

  In step S11, it is determined whether or not a predetermined time (second predetermined time) has elapsed since the previous active mode was set. Here, the predetermined time is 1 second from the timing when the previous active mode is set. In step S11, the process waits until a predetermined time elapses, and then proceeds to step S12.

  In step S12, the active mode is set by the mode setting unit 45d. In other words, in step S12, the operation mode is switched from the sleep mode to the active mode by the mode setting unit 45d. As a result, the ESL 40 is switched to a state in which the infrared signal transmitted from the transceiver 30 can be received. Thereafter, the process proceeds to step S13.

  In step S13, it is determined whether or not a detection flag is set. That is, in step S13, it is determined whether or not a voltage detection detection flag is set. If the detection flag is not set in step S13, the process proceeds to step S17. On the other hand, if the detection flag is set in step S13, the process proceeds to step S14.

  In step S14, it is determined whether the voltage of the capacitor 44 is equal to or higher than a predetermined threshold value. In step S14, when the voltage of the capacitor 44 is equal to or higher than the predetermined threshold value, the process proceeds to step S17. On the other hand, when the voltage of the capacitor 44 is lower than the predetermined threshold in step S14, the process proceeds to step S15.

  In step S15, a pre-response charging process is performed. That is, in step S15, the charging process execution unit 45i temporarily switches the charging circuit switch from OFF to ON. The power of the battery 43 is boosted by a booster circuit and stored in the capacitor 44. Thereafter, the process proceeds to step S16.

  In step S16, the detection flag is cleared. In other words, the detection flag is lowered in step S16. Thereafter, the process proceeds to step S17.

  In step S17, command reception processing is executed (see FIG. 8). Thereafter, the process proceeds to step S18.

  In step S18, it is determined whether or not a predetermined time (third predetermined time) has elapsed. Here, the predetermined time is 1 millisecond from the timing when the active mode is set. If the predetermined time has not elapsed in step S18, the process returns to step S17. On the other hand, if the predetermined time has elapsed in step S18, the process proceeds to step S19.

  In step S19, the sleep mode is set by the mode setting unit 45d. That is, the operation mode is switched from the active mode to the sleep mode by the mode setting unit 45d. Thereby, ESL40 is switched to the state which cannot receive the infrared signal sent from the transceiver 30. FIG. Then, it returns to step S11.

(4-2) Flow of Command Acceptance Processing Next, the flow of command acceptance processing will be described with reference to FIG.

  First, in step S21, it is determined whether or not there is a command (transmission command) transmitted from the ESL server 10. Specifically, in step S21, it is determined whether there is an infrared signal transmitted from the transceiver 30. If there is no transmission command in step S21, the process ends. On the other hand, if there is a transmission command in step S21, the process proceeds to step S22.

  In step S22, it is determined whether or not the transmission command is addressed to itself. Specifically, in step S22, it is determined whether or not the device ID added to the command matches the own device ID. If the device ID added to the command is different from its own device ID in step S22, the process ends. On the other hand, if the device ID added to the command matches the own device ID in step S22, the process proceeds to step S23.

  In step S23, a command is accepted. That is, a command is received and stored by the information receiving unit 45a. The display content update unit 45c updates the display content based on the command. Thereafter, the process proceeds to step S24.

  In step S24, a response signal is transmitted by the response signal transmitter 45b. The response signal is sent from the communication unit 41 to the ESL server 10 via the transceiver 30 and the base station 20. Thereafter, the process proceeds to step S25.

  In step S25, the post-response charging process is executed by the charging process execution unit 45i. That is, the charging process execution unit 45i temporarily switches the charging circuit switch from OFF to ON. The power of the battery 43 is boosted by a booster circuit and stored in the capacitor 44.

(4-3) Flow of Voltage Detection Timer Process Next, the flow of the voltage detection timer process will be described with reference to FIG.

  First, in step S31, it is determined whether or not a predetermined time (first predetermined time) counted by the second timer unit 45g has elapsed. Specifically, in step S31, the process waits until a predetermined time (specifically, 1 hour) elapses. When the predetermined time elapses, the process proceeds to step S32.

  In step S32, a detection flag is set by the detection flag setting unit 45e. In other words, in step S32, the detection flag setting unit 45e sets a detection flag. Thereafter, the process proceeds to step S33.

  In step S33, the second timer unit 45g is stopped. Thereafter, the process proceeds to step S34.

  In step S34, it is determined whether or not the detection flag is cleared. In step S34, if the detection flag is not cleared, the process waits until the detection flag is cleared. If the detection flag is cleared, the process proceeds to step S35.

  In step S35, counting by the second timer unit 45g is started. Then, it returns to step S31.

(5) Features (5-1)
In the electronic shelf label system 1 according to the above embodiment, the electric power supplied from the battery 43 is stored in the capacitor 44. The voltage of the capacitor 44 is detected by the voltage detector 45h. The charging process is performed based on the voltage of the capacitor 44 detected by the voltage detection unit 45h.

  In the conventional electronic shelf label system, the ESL stores electric power necessary for transmitting the response signal, and therefore, charging is performed before transmitting the response signal. Specifically, the ESL started charging the capacitor at the timing when the wakeup signal from the ESL server was detected. That is, all ESLs that have detected the wake-up signal have started the charging process. As a result, even when the ESL does not transmit a response signal to the ESL server, the capacitor is charged. In other words, the ESL that is not the target to which the command is transmitted has started the charging process even though it is not necessary to transmit the response signal. As a result, useless current consumption occurs in the ESL.

  However, in the electronic shelf label system 1 according to the above embodiment, the charging process of the capacitor 44 is performed based on the voltage of the capacitor 44 detected by the voltage detection unit 45h. That is, even when the ESL 40 detects the wakeup signal, the ESL 40 performs the charging process of the capacitor 44 in consideration of the voltage of the capacitor 44 detected by the voltage detection unit 45h. Thereby, useless current consumption can be suppressed and consumption of the battery can be suppressed.

(5-2)
Further, in the electronic shelf label system 1 according to the above-described embodiment, the voltage of the capacitor 44 is detected at the first predetermined time interval by the voltage detection unit 45h. Moreover, it is preferable that the charge process execution part 45i performs the charge process of the capacitor | condenser 44, when the voltage of the capacitor | condenser 44 detected by the voltage detection part 45h is lower than a predetermined threshold value. Here, the predetermined threshold value is a voltage value at which the response signal can be transmitted once.

  In the conventional electronic shelf label system, the charging process is executed regardless of the voltage of the capacitor. However, if a voltage that can transmit the response signal remains, it is not necessary to perform the charging process before transmitting the response signal. In the electronic shelf label system 1 according to the above embodiment, the ESL 40 executes the charging process before transmitting the response signal only when the charging process is really necessary (pre-response charging process). Thereby, useless charging processing can be suppressed.

(5-3)
Furthermore, in the electronic shelf label system 1 according to the above embodiment, the charging process execution unit 45i further performs the charging process of the capacitor 44 after the response signal is transmitted to the ESL server 10 by the response signal transmission unit 45b. .

  When the voltage of the capacitor 44 is reduced by the voltage detection timing and the voltage required for response signal transmission cannot be secured, even if response signal transmission processing is executed by the response signal transmission unit 45b, The response signal does not reach the transceiver 30. If the response signal does not reach the transceiver 30, the ESL server 10 retries command transmission. Therefore, the command is transmitted again from the ESL server 10 via the transceiver 30. The ESL 40 according to the above-described embodiment is configured to execute a charging process (post-response charging process) after executing a response signal transmission process. As a result, when the command is retransmitted from the ESL server 10, the capacitor 44 is charged, and a response signal can be transmitted in response to the retransmitted command. As a result, the ESL server 10 can confirm the receipt of the command by the ESL 40 at an early stage.

(5-4)
In the electronic shelf label system 1 according to the embodiment, the active mode and the sleep mode of the ESL 40 are alternately set by the mode setting unit 45d. The mode setting unit 45d switches between the active mode and the sleep mode so that the active mode is set at the second predetermined time interval. The second predetermined time interval is a time interval shorter than the first predetermined time interval. The active mode is a mode in which an infrared signal can be received. The sleep mode is a mode in which an infrared signal cannot be received. In addition, the charging process execution unit 45i is the capacitor 44 after the active mode is set by the mode setting unit 45d and when the voltage of the capacitor 44 lower than a predetermined threshold is detected by the voltage detection unit 45h. The charging process (pre-response charging process) is performed.

  Since the ESL 40 is driven by the power supplied by the battery, if the active mode is always set, the battery is consumed significantly. On the other hand, since the ESL 40 also accepts input of commands from an operator using a portable terminal (remote controller) or the like, if the sleep mode is set for a long time, the responsiveness is poor. Therefore, the ESL 40 switches between the active mode and the sleep mode so that the active mode is set at the second predetermined time interval (approximately one second interval). Here, in the above embodiment, the charging process of the capacitor 44 is executed when the voltage detected by the voltage detection unit 45h is lower than a predetermined threshold value in the active mode.

  Thereby, since a charging process can be performed at the timing of active mode, energy-saving efficiency can be improved. In addition, since the charging process can be performed only on the capacitors that require the charging process, wasteful current consumption can be suppressed.

(5-5)
Further, in the electronic shelf label system 1 according to the above-described embodiment, the charging process execution unit 45i performs the charging process of the capacitor 44 in accordance with the timing when the active mode is set by the mode setting unit 45d. Thereby, power consumption can be suppressed more effectively.

(6) Modification (6-1) Modification A
In the electronic shelf label system 1 according to the above embodiment, in order to suppress the consumption of the battery 43, the charging process of the capacitor 44 is executed after transmitting the response signal, and further, the first predetermined time interval (for example, 1 When the voltage of the capacitor 44 is lower than a predetermined threshold at every hour), the capacitor 44 is charged.

  Here, in order to suppress the consumption of the battery 43, the following configuration may be provided instead of the configuration of the electronic shelf label system 1 according to the embodiment.

  In the ESL server, when transmitting a command to the ESL 40, the information transmission unit 52c transmits a device ID list and transmission timing prior to the command. The device ID list is a list indicating the device ID of the ESL 40 that is a command transmission target. The transmission timing indicates the timing at which a command is transmitted for all ESLs 40 listed in the device ID list.

  Specifically, the ESL server continuously transmits a timer signal for notifying the transmission timing of the device ID list for one second before transmitting data such as the device ID list. The ESL 40 checks the infrared rays related to the timer signal sent from the transceiver 30 every second. The ESL 40 detects infrared rays and receives a timer signal. Thereafter, the mode setting unit 45d sets the sleep mode. The mode setting unit 45d switches the operation mode to the active mode in accordance with the transmission timing of the device ID list indicated by the timer signal, and receives the device ID list.

  Here, if the received device ID list includes its own ID, the capacitor 44 is charged in advance in accordance with the transmission timing for the own ID. Thereafter, a command is received by the information receiving unit 45a, and a response signal is transmitted by the response signal transmitting unit 45b and a display update by the display content updating unit 45c is executed. On the other hand, if the received device ID list does not include its own ID, it waits in the sleep mode until the entire communication is completed.

  Thereby, the charging process of the capacitor 44 is performed at a timing when only the ESL whose display contents are to be updated is necessary. This can also prevent wasteful battery consumption.

(6-2) Modification B
Moreover, in order to suppress useless battery consumption, the following configuration may be employed instead of the configuration described in the above embodiment and Modification A.

  The ESL 40 executes a charging process for the capacitor 44 in response to the charging command sent from the ESL server 10. The charge command is a command for instructing a charging process. The ESL 40 that has received the charging command executes the charging process both at the timing before the response signal transmission and after the response signal transmission.

  Specifically, the ESL server 10 transmits a charge command for instructing charging of the capacitor 44 to the ESL 40 that is a command transmission target at an arbitrary timing prior to an update command for instructing update of display contents. The device ID of the ESL 40 to be commanded is added to the charging command. The ESL 40 receives the charge command to which the same device ID as the self device ID is added, and executes the charging process. In addition, after receiving the update command, the ESL 40 performs further charging processing.

  Thus, even when a plurality of commands are transmitted to the same ESL during one wakeup, only one command is required to prompt charging of the capacitor 44.

  Conventionally, the ESL generally performs a charging process on the capacitor 44 even when communication is performed so as not to return a response signal with an external device. For example, when a command such as a back screen display from a portable terminal is received, the charging process is performed even though a response signal is not transmitted to the portable terminal. However, the charging process for the capacitor 44 may be performed only when the process for transmitting the response signal is performed. Thereby, battery consumption can be further reduced.

(6-3) Modification C
The electronic shelf label system 1 according to the above embodiment may be used together with other systems. For example, the other system is a POS system. The POS system is a system that collects and analyzes information related to the sale of products at the time of sale. The POS system mainly includes a plurality of registers and a POS server. The register pays for the goods. In the POS server, information related to products settled in a plurality of registers is collected. By using it together with the electronic shelf label system 1 and the POS system, it is possible to comprehensively manage product information such as product prices and product information such as the number of products sold and the number of stocks.

(6-4) Modification D
In addition, the ESL 40 according to the above embodiment may further include input means (for example, a switch, a button, etc.). The input means is attached to the frame body 40a and can be directly input by an operator.

(6-5) Modification E
In ESL40 concerning the above-mentioned embodiment, control device 45 is constituted by CPU, ROM, and RAM, and functions as a plurality of functional parts 45a-45i based on a program memorized by ROM.

  Here, the control apparatus 45 is not restricted to what is comprised by CPU, ROM, and RAM. For example, the control device 45 may be configured by an ASIC. That is, the control device 45 may have any configuration as long as it functions like the control device 45 described above.

(6-6) Modification F
In ESL40 which concerns on the said embodiment, the timing which switches an operation mode was obtained based on the time counted by the 1st timer part 45f. Specifically, the first timer unit 45f counts the second predetermined time and the third predetermined time, and the mode setting unit 45d performs the second predetermined time from the timing when the active mode is set first. The operation mode was switched so that the next active mode was set after the elapse of time, and the sleep mode was set at a third predetermined time after the active mode was set. Further, the second predetermined time was about 1 second and the third predetermined time was about 1 millisecond.

  Here, the second predetermined time and the third predetermined time are arbitrary times and may be appropriately changed by the operator. In addition, the second predetermined time and the third predetermined time may be counted by different timer units.

1 Electronic shelf label system 10,110 ESL server (server)
DESCRIPTION OF SYMBOLS 11 Communication part 12 Display part 13 Input part 14 Output part 15 Control apparatus 20 Base station 30 Transceiver (communication apparatus)
40 ESL (electronic shelf label)
41 Communication unit (receiver / transmitter)
42 display unit 43 battery 44 capacitor 45 control device 45a information receiving unit 45b response signal transmission unit 45c display content update unit 45d mode setting unit 45e detection flag setting unit 45f first timer unit 45g second timer unit 45h voltage detection unit (detection unit) )
45i charge processing execution part

Special table 2002-516430 gazette

  The present invention relates to an electronic shelf label system.

  In recent years, electronic shelf label systems have been adopted in stores such as supermarkets and convenience stores. In the electronic shelf label system, information (product information) about a plurality of products handled is centrally managed by a server. The server is arranged in the store backyard. The merchandise information is displayed on the electronic shelf label. Electronic shelf labels are provided at store sales floors. The electronic shelf label is arranged in association with each of a plurality of products at the sales floor. The electronic shelf label is a display device that is driven by a battery and a capacitor as disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-516430. The capacitor stores the power supplied by the battery. In the electronic shelf label system, when the product information managed by the server is updated, a command (update command) including product information from the server to the electronic shelf label is reflected in order to reflect the update on the electronic shelf label. Sent. When receiving the update command, the electronic shelf label updates the display content of the electronic shelf label based on the update command.

  By the way, in the electronic shelf label system as shown in Patent Document 1, generally, when the product information is updated by the server, the server sends an update command including the updated product information to the electronic shelf label. Then, a wake-up signal is transmitted to the electronic shelf label. Thereafter, the server transmits an update command to the electronic shelf label with the device ID of the electronic shelf label to be updated. The electronic shelf label is switched between a sleep mode and an active mode at a predetermined time interval (for example, every second) in order to suppress power consumption. When the electronic shelf label receives a wake-up signal from the server when the active mode is set, the electronic shelf label waits in the active mode until an update command is transmitted from the server. When the electronic shelf label receives an update command with the same device ID as its own device ID from the server, the electronic shelf label transmits a response signal indicating that the update command has been received to the server. Switch to On the other hand, if the electronic shelf label does not receive a wakeup signal in the active mode, or after receiving the wakeup signal, the electronic shelf label must receive an update command with the same device ID as its own device ID. After that, the mode is switched to the sleep mode.

  Here, since the electronic shelf label proposed in Patent Document 1 stores electric power necessary for transmission of the response signal, charging of the capacitor is started at the timing when the wake-up signal from the server is detected. That is, even when the electronic shelf label does not transmit a response signal to the server for some reason, the capacitor charging process is started. As a result, wasteful current consumption occurs in the electronic shelf label.

  An object of the present invention is to provide an electronic shelf label system that suppresses wasteful current consumption and suppresses battery consumption.

  An electronic shelf label system according to the present invention includes an electronic shelf label, a server, and a communication device. The electronic shelf label is arranged in association with the product. The electronic shelf label displays product information related to the associated product. The server stores association information between product information and electronic shelf labels. The communication device transmits an infrared signal including product information to the electronic shelf label based on the association information of the server. The electronic shelf label includes a reception unit, a transmission unit, a battery, a capacitor, a detection unit, and a charging process execution unit. The receiving unit receives an infrared signal transmitted from the communication device. When the infrared signal is received by the reception unit, the transmission unit transmits a response signal toward the server. The battery is a power source. The capacitor stores electric power supplied from the battery. The detection unit detects the voltage of the capacitor. The charging process execution unit performs the capacitor charging process based on the capacitor voltage detected by the detection unit.

  In the electronic shelf label system according to the present invention, the capacitor charging process is performed based on the capacitor voltage detected by the detector. Thereby, consumption of the battery can be suppressed.

  The detection unit detects the voltage of the capacitor at the first predetermined time interval, and the charging process execution unit performs the capacitor charging process when the voltage of the capacitor detected by the detection unit is lower than a predetermined threshold. It is preferable to carry out. Thereby, useless charging processing can be suppressed.

The charging process execution unit, after the response signal to the server by the Send section is transmitted, further, it is preferable to perform the charging process of the capacitor. As a result, even when the voltage of the capacitor is reduced by the voltage detection timing and the voltage is insufficient when the response signal is transmitted, the response signal can be transmitted to the infrared signal transmitted from the server thereafter. .

  Moreover, it is preferable that an electronic shelf label further has a mode setting part. The mode setting unit alternately sets the active mode and the sleep mode. The mode setting unit sets the active mode at the second predetermined time interval. The second predetermined time interval is a time interval shorter than the first predetermined time interval. The active mode is a mode in which an infrared signal can be received. The sleep mode is a mode in which an infrared signal cannot be received. The charging process execution unit performs the capacitor charging process after the active mode is set by the mode setting unit and when the voltage of the capacitor lower than the predetermined threshold is detected by the detection unit. Is preferred. As a result, when the active mode is set, the charging process can be performed only for the capacitors that require the charging process. As a result, wasteful current consumption can be suppressed.

  Moreover, it is preferable that a charge process execution part performs a capacitor | condenser charge process according to the timing when an active mode is set by the mode setting part. Thereby, power consumption can be suppressed more effectively.

  The electronic shelf label system according to the present invention can suppress wasteful current consumption and suppress battery consumption.

It is a figure which shows the electronic shelf label system which concerns on one Embodiment of this invention. It is a block diagram which shows schematic structure of an ESL server. It is a figure which shows the example of a goods master table. It is a figure which shows the example of an ESL master table. It is a figure which shows the external appearance of ESL. It is a block diagram which shows schematic structure of ESL. It is a figure which shows the flow of a voltage detection process. It is a figure which shows the flow of a command reception process. It is a figure which shows the flow of a voltage detection timer process.

  Hereinafter, an electronic shelf label system 1 according to an embodiment of the present invention will be described with reference to the drawings.

(1) Overall Configuration FIG. 1 shows an electronic shelf label system 1 according to the present invention. The electronic shelf label system 1 is a system that collectively manages data relating to product ordering, production, sales, price, and the like in stores such as supermarkets and convenience stores.

  As shown in FIG. 1, an electronic shelf label system 1 mainly includes a plurality of ESL (electronic shelf labels) 40, 40,..., An ESL server (server) 10, a base station (communication device) 20, It comprises a plurality of transceivers (communication devices) 30, 30,. The numbers of ESLs 40, base stations 20, and transceivers 30 included in the electronic shelf label system 1 are not limited to the numbers shown in FIG.

  The ESL 40 is a display device that is arranged in association with each of a plurality of products handled in a store. ESL40 is arrange | positioned in the vicinity of the matched goods among the several goods displayed at the sales floor of a store, and displays the merchandise information which concerns on the matched goods (refer FIG. 5).

  The ESL server 10 is a general computer that centrally manages information on a plurality of products handled in a store. The ESL server 10 is disposed in a store backyard or the like. Further, the ESL server 10 manages display contents of the plurality of ESLs 40. Specifically, when the product information to be managed is updated, the ESL server 10 generates a command to be transmitted to the ESL 40 in order to update the product information to be displayed on the ESL 40. The command is a signal that instructs the ESL 40 to execute various processes. The command includes information necessary for processing to be executed by the ESL 40. For example, the information included in the command includes product information (for example, image information) to be displayed on the ESL 40 screen. In addition, an identifier of an ESL (target ESL) that is a target for executing the command is added to the command. The ESL 40 and the ESL server 10 exchange signals via the base station 20 and the transceiver 30.

  The base station 20 has a function of relaying between the ESL server 10 and the transceiver 30. The base station 20 is connected to the ESL server 10 and the transceiver 30 via a dedicated communication cable 2. The transceiver 30 is a transceiver. Specifically, the transceiver 30 has both a transmission function to the ESL 40 and a reception function of a response signal sent from the ESL 40. More specifically, the transceiver 30 transmits a signal transmitted from the ESL server 10 to each ESL 40 by radio using infrared rays or the like. That is, the transceiver 30 transmits an infrared signal including product information to the ESL 40. Further, the transceiver 30 receives a response signal sent from the ESL 40 and sends it to the ESL server 10. For example, the transceiver 30 is attached to each section in the store (for example, the ceiling) at a certain interval. Each transceiver 30 forms a communication area. The transceiver 30 transmits a wake-up signal to the ESL 40 before transmitting the command generated in the ESL server 10 to the ESL 40.

  When a command is generated in the ESL server 10, the ESL server 10 transmits the command to the ESL 40 via the base station 20 and the transceiver 30. When each ESL 40 detects a command transmitted from the ESL server 10, the ESL 40 compares an identifier added to the command (additional identifier) with a unique identifier (unique identifier) that each ESL 40 has. Each ESL 40 receives a command when the additional identifier and the unique identifier are the same, and updates the product information displayed on the screen based on the command. That is, the ESL 40 updates or changes the display content in accordance with the command sent from the ESL server 10.

  Hereinafter, the configurations of the ESL server 10 and the ESL 40 will be described in detail.

(2) ESL server As described above, the ESL server 10 centrally manages product information on a plurality of products handled in a store. That is, the ESL server 10 stores various types of information related to all products handled in the store. As described above, the ESL server 10 is installed in a store backyard or the like. The ESL server 10 is a device in which software for controlling the electronic shelf label system 1 is installed in a computer such as a workstation or a personal computer. The ESL server 10 generates a command for instructing display of merchandise information or updating of merchandise information, and transmits the command to all ESLs 40 in the store or one of the ESLs 40.

  As shown in FIG. 2, the ESL server 10 mainly includes a communication unit 11, a display unit 12, an input unit 13, an output unit 14, and a control device 15.

(2-1) Communication Unit The communication unit 11 is a communication interface for enabling communication with the base station 20. The command sent from the communication unit 11 to the base station 20 further reaches the ESL 40 via the transceiver 30.

(2-2) Display unit The display unit 12 includes a liquid crystal display.

(2-3) Input unit The input unit 13 includes a mouse and a keyboard.

(2-4) Output unit The output unit 14 is a printer. The output unit 14 outputs a summary result of various data in the ESL server 10.

(2-5) Control Device The control device 15 includes a CPU, a ROM, a RAM, and a hard disk, and functions as the storage unit 51 and the control unit 52.

(2-5-1) Storage Unit The storage unit 51 stores a control program to be executed by the control unit 52 described later. As shown in FIG. 2, the storage unit 51 mainly stores a product master table 51a and an ESL master table 51b.

(A) Product Master Table The product master table 51 a stores information (product information) related to products handled by the electronic shelf label system 1. The product information is basic information about the product (for example, the name of the product to be handled, the product code, etc.). Image information to be displayed on the ESL 40 is created based on the product information stored in the product master table 51a.

  Specifically, FIG. 3 shows an example of product information stored in the product master table 51a. In the product master table 51a, for example, various information such as product name, product ID, unit price (normal unit price / reduction price), price (normal price / reduction price), expiration date, place of origin, and raw materials / additives are stored in association with each other. Has been.

(B) ESL Master Table The ESL master table 51b stores basic information regarding all the ESLs 40 arranged in the electronic shelf label system 1. The basic information is basic information related to the ESL 40 and is information input in advance by the operator. In the basic information, as shown in FIG. 4, a device ID, a product ID, a product name, and the like are stored. Here, the device ID is an identifier unique to each ESL 40. In other words, the device ID is a hardware ID unique to each of all the ESLs 40. The product ID and the product name are the ID and name of the product associated with the ESL 40. That is, in the ESL master table 51b, the device ID of the ESL 40, the product ID, and the product name are stored in association with each other. In other words, the ESL master table 51b stores association information between product information and ESL. Although not shown, other information (for example, performance of each ESL 40) may be stored in the ESL master table 51b.

(2-5-2) Control Unit The control unit 52 performs various controls based on programs and various information stored in the storage unit 51. Further, as shown in FIG. 2, the control unit 52 functions as an information reception unit 52a, a command generation unit 52b, an information transmission unit 52c, and a response signal reception unit 52d.

(A) Information receiving unit The information receiving unit 52a receives various information input via the input unit 13. The various information received by the information receiving unit 52a includes, for example, product information (new information / update information), basic information of the ESL 40, and the like. Various types of information received by the information receiving unit 52a are stored in the storage unit 51.

(B) Command Generation Unit The command generation unit 52b generates a command to be transmitted to the ESL 40 based on a command input from the operator via the input unit 13 or a program stored in the storage unit 51. To do. The command generated by the command generation unit 52b includes an update command. The update command is a command for instructing update of display contents of the ESL 40. The update command includes product information (image information or the like) to be displayed on the ESL 40 screen.

(C) Information transmission unit The information transmission unit 52c transmits the command generated by the command generation unit 52b to the ESL 40. Based on the association information stored in the ESL master table 51b, the information transmission unit 52c transmits a command with an identifier (device ID) unique to the destination ESL 40. Specifically, the information transmission unit 52c transmits a command following the device ID of the ESL 40 that is a target for executing the command.

  The information transmission unit 52c retransmits a command when a response signal is not received within a predetermined time by a response signal reception unit 52d described later. The command retransmission is repeated a predetermined number of times.

(D) Response signal receiving unit The response signal receiving unit 52d receives a response signal transmitted from the ESL 40. Specifically, the response signal receiving unit 52 d receives the response signal transmitted from the ESL 40 via the transceiver 30 and the base station 20.

  The response signal receiving unit 52d waits to receive a response signal sent from the ESL 40 for a predetermined time (for example, 1 second) after the command to the ESL 40 is transmitted by the information transmitting unit 52c. When the response signal receiving unit 52d receives a response signal within a predetermined time, the response signal receiving unit 52d stores that fact in the storage unit 51. On the other hand, if the response signal receiving unit 52d does not receive the response signal within a predetermined time, the response signal receiving unit 52d instructs the information transmitting unit 52c to retransmit the command. If the response signal is not received even though the information transmission unit 52c has retransmitted the command a predetermined number of times, the response signal reception unit 52d stores this in the storage unit 51.

(3) ESL
ESL40 is a terminal for displaying merchandise information, as shown in FIG. As described above, the ESL 40 is arranged in association with each of a plurality of products handled at the store, and displays product information related to the associated products. ESL40 is arrange | positioned in the vicinity of the matched goods. The product information displayed on the ESL 40 includes a product name, a unit price, a price, a barcode, and the like as shown in FIG.

As shown in FIG. 6, the ESL 40 mainly includes a communication unit (reception unit) 41, a display unit 42, a battery 43, a capacitor 44, and a control device 45.

(3-1) Communication Unit The communication unit 41 enables communication with the transceiver 30 and an external terminal (for example, a mobile terminal (not shown)). Specifically, the communication unit 41 functions as a receiving unit that receives infrared rays transmitted from the transceiver 30 and transmission of infrared rays transmitted from an external terminal in accordance with transmission of a command by the ESL server 10.

  The communication unit 41 also functions as a transmission unit that transmits infrared rays related to the response signal to the ESL server 10. Here, the response signal is a signal for notifying reception of a command sent from the ESL server 10, and is transmitted by a response signal transmission unit 45b described later. That is, the response signal transmitted by the response signal transmission unit 45 b is sent to the transceiver 30 via the communication unit 41.

  In addition, the communication part 41 is provided in the frame 40a of ESL40, as shown in FIG.

(3-2) Display part The display part 42 comprises the screen which displays the information regarding goods. The display unit 42 is made of dot matrix type electronic paper. That is, the display unit 42 is a non-volatile display unit including a plurality of pixels arranged in a matrix. The display unit 42 does not require driving power to maintain display contents.

  The display unit 42 displays the product information based on the command sent from the ESL server 10. Further, the content displayed on the display unit 42 is updated based on the command.

(3-3) Battery and Capacitor The battery 43 is a power source of the ESL 40. The battery 43 is provided inside the frame body 40a. The capacitor 44 stores the power supplied from the battery 43. The capacitor 44 stores power boosted by a booster circuit provided in the control device 45 described later. The electric power stored in the capacitor 44 is used when a response signal is transmitted by a response signal transmission unit 45b described later.

(3-4) Control Device The control device 45 includes a CPU, a ROM, and a RAM. The control device 45 is provided with a booster circuit, a charging circuit, etc. (not shown). In addition to a program for managing the screen of the ESL 40, the control device 45 stores an identifier (device ID) unique to each ESL 40, image information, and the like. Here, the image information stored in the control device 45 is image information included in the most recently received command. When a new command is received, the image information stored in the control device 45 is overwritten by the image information included in the new command.

Based on the program stored in the ROM, the control device 45 includes an information reception unit 45a, a response signal transmission unit (transmission unit) 45b, a display content update unit 45c, a mode setting unit 45d, a detection flag setting unit 45e, and a first timer. Unit 45f, second timer unit 45g, voltage detection unit (detection unit) 45h, and charging process execution unit 45i.

(3-4-1) Information Receiving Unit The information receiving unit 45a receives a command transmitted from the ESL server 10 via the communication unit 41. Specifically, the information receiving unit 45a detects an infrared signal (wake-up signal) sent from the transceiver 30. When the wakeup signal is detected by the information receiving unit 45a, the ESL 40 stands by in the active mode. Thereafter, the information receiving unit 45a compares the identifier (addition identifier) added to the infrared signal (command) sent from the transceiver 30 with the identifier (unique identifier) unique to each ESL 40 stored in the control device 45. . Here, only when the additional identifier matches the unique identifier, the information receiving unit 45a receives a command. Thereafter, the information receiving unit 45a stores information included in the command.

(3-4-2) Response Signal Transmitter The response signal transmitter 45b transmits a response signal (Ack) to the ESL server 10 when a command is received by the information receiver 45a. The response signal is a signal indicating that a command has been received. The response signal transmitted by the response signal transmission unit 45 b is transmitted to the transceiver 30 by infrared rays via the communication unit 41, and then transmitted to the ESL server 10 via the transceiver 30.

(3-4-3) Display Content Update Unit The display content update unit 45c updates (changes) the content displayed on the display unit (screen) 42 based on the command received by the information receiving unit 45a. Specifically, the display content update unit 45c updates the display content based on the stored image information. That is, the display content update unit 45c clears the old image information previously displayed on the screen based on the new image information.

(3-4-4) Mode setting unit The mode setting unit 45d switches the operation mode. Here, the operation mode includes an active mode and a sleep mode. The mode setting unit 45d alternately sets the active mode and the sleep mode. The mode setting unit 45d switches between the sleep mode and the active mode at a predetermined time interval.

Here, the active mode is a mode in which a command from the ESL server 10 can be received. That is, when it is set active mode by the mode setting unit 45d, ESL40 is capable of receiving an infrared signal transmitted from the transceiver 30. The sleep mode is a mode in which a command from the ESL server 10 cannot be received. That is, when the sleep mode is set by the mode setting unit 45d, the ESL 40 cannot receive the infrared signal transmitted from the transceiver 30. The ESL 40 is in the active mode when receiving a command from the ESL server 10 and when updating the display content according to the command, and stands by in the sleep mode otherwise.

  Specifically, the mode setting unit 45d switches the operation mode so that the active mode is set at a predetermined time interval (second predetermined time interval) (for example, approximately every 1 second). Specifically, the mode setting unit 45d sets the next active mode after a second predetermined time (for example, about 1 second) has elapsed from the timing when the active mode was previously set. The mode setting unit 45d switches the operation mode to the sleep mode after continuing the active mode for a third predetermined time (for example, about 1 millisecond). Note that the predetermined time interval (second predetermined time interval) at which the operation mode is switched by the mode setting unit 45d is the time interval (first predetermined time) at which the detection flag is set by the detection flag setting unit 45e described later. Time interval shorter than (interval).

(3-4-5) Detection flag setting unit The detection flag setting unit 45e sets a detection flag. The detection flag is a flag used for causing a voltage detection unit 45h described later to execute a voltage detection process. Specifically, the detection flag setting unit 45e executes a process of setting a detection flag at a predetermined time interval (first predetermined time) (for example, every hour). The voltage detection unit 45h described later executes a voltage detection process at a timing when the detection flag is set by the detection flag setting unit 45e and set to the active mode by the mode setting unit 45d described above. The detection flag setting unit 45e lowers the detection flag after the voltage detection processing is executed by the voltage detection unit 45h.

(3-4-6) First timer unit The first timer unit 45f counts a predetermined time in order to obtain timing for switching the operation mode by the mode setting unit 45d. In other words, the first timer unit 45f is set to obtain timings for switching the sleep mode to the active mode and timings for switching the active mode to the sleep mode.

  Specifically, the first timer unit 45f starts counting the second predetermined time at the timing when the active mode is set. Here, the second predetermined time is, for example, about 1 second as described above. The first timer unit 45f starts counting the third predetermined time at the timing when the active mode is set. Here, as described above, the third predetermined time is, for example, about 1 millisecond.

  The first timer unit 45f stops counting the third predetermined time when the information reception unit 45a detects the wakeup signal. Specifically, the first timer unit 45f until the information receiving unit 45a determines that the additional identifier and the unique identifier are different, or until the command is executed when it is determined that the additional identifier and the unique identifier match. Then, the counting of the third predetermined time is stopped. Thereafter, the first timer unit 45f resets the count of the third predetermined time, and starts counting the third predetermined time at the timing when the next active mode is set.

(3-4-7) Second Timer Unit The second timer unit 45g has a predetermined time (a predetermined time) so that the detection flag is set by the detection flag setting unit 45e at a predetermined time interval (first predetermined time interval). 1st predetermined time) is counted. In other words, the second timer unit 45g is set to obtain a timing for setting a detection flag (that is, a voltage detection timing). The second timer unit 45g starts counting a predetermined time (first predetermined time) at the timing when the flag is cleared by the detection flag setting unit 45e. Here, the predetermined time is, for example, one hour.

(3-4-8) Voltage Detection Unit The voltage detection unit 45h detects the voltage of the capacitor 44 at the first predetermined time interval. Specifically, the voltage detection unit 45h detects the voltage of the capacitor 44 when the detection flag is set by the detection flag setting unit 45e and the active mode is set by the mode setting unit 45d described above. In other words, if the detection flag is set when the voltage detection unit 45h is set to the active mode, the voltage detection process is performed.

  The voltage detection unit 45h determines whether the detected voltage of the capacitor 44 is lower than a predetermined threshold value. Here, the predetermined threshold value is an arbitrary value and is a voltage value at which the response signal can be transmitted once. That is, the predetermined threshold value may be different for each ESL 40. A comparison result between the voltage of the capacitor 44 and a predetermined threshold value by the voltage detection unit 45 h is stored in the control device 45.

(3-4-9) Charging Process Execution Unit The charging process execution unit 45i performs the charging process for the capacitor 44 in accordance with the timing when the active mode is set by the mode setting unit 45d. In other words, the charging process execution unit 45i performs the charging process of the capacitor 44 when the active mode is set by the mode setting unit 45d. The charging process execution unit 45i temporarily switches the charging circuit switch from OFF to ON.

  The charging process includes a post-response charging process and a pre-response charging process. The post-response charging process is a charging process executed after transmitting a response signal. The pre-response charging process is a charging process that is executed before a response signal is transmitted.

  Based on the voltage of the capacitor 44 detected by the voltage detection unit 45h, the charging process execution unit 45i executes a post-response charging process, or a post-response charging process and a pre-response charging process. In other words, the charging process execution unit 45i executes the pre-response charging process in addition to the post-response charging process based on the comparison result between the voltage of the capacitor 44 and the predetermined threshold value by the voltage detection unit 45h.

  Specifically, the charging process execution unit 45i determines that the voltage of the capacitor 44 detected by the voltage detection unit 45h is equal to or higher than a predetermined threshold when the detection flag is not set or even when the detection flag is set. In this case, only the post-response charging process is executed. That is, the charging process execution unit 45i executes the charging process after transmitting the response signal.

  On the other hand, when the detection flag is set and the voltage of the capacitor 44 detected by the voltage detection unit 45h is lower than a predetermined threshold, the charging process execution unit 45i responds in addition to the post-response charging process. Perform pre-charge processing. Specifically, when the voltage detection unit 45h detects a voltage of a capacitor lower than a predetermined threshold when the mode setting unit 45d sets the active mode, the charging process execution unit 45i displays the response signal transmission unit 45b. Is executed before the response signal directed to the ESL server 10 is transmitted, and then the response signal directed to the ESL server 10 is transmitted by the response signal transmitting unit 45b, The capacitor 44 is charged (after-response charging).

(4) Processing in ESL Next, the flow of processing in the ESL 40 will be described with reference to FIGS. FIG. 7 shows the flow of voltage detection processing. FIG. 8 shows the flow of command reception processing. FIG. 9 shows the flow of the voltage detection timer process.

(4-1) Voltage Detection Processing First, the flow of voltage detection processing will be described with reference to FIG.

  In step S11, it is determined whether or not a predetermined time (second predetermined time) has elapsed since the previous active mode was set. Here, the predetermined time is 1 second from the timing when the previous active mode is set. In step S11, the process waits until a predetermined time has elapsed, and then proceeds to step S12.

  In step S12, the active mode is set by the mode setting unit 45d. In other words, in step S12, the operation mode is switched from the sleep mode to the active mode by the mode setting unit 45d. As a result, the ESL 40 is switched to a state in which the infrared signal transmitted from the transceiver 30 can be received. Thereafter, the process proceeds to step S13.

  In step S13, it is determined whether or not a detection flag is set. That is, in step S13, it is determined whether or not a voltage detection detection flag is set. If the detection flag is not set in step S13, the process proceeds to step S17. On the other hand, if the detection flag is set in step S13, the process proceeds to step S14.

  In step S14, it is determined whether the voltage of the capacitor 44 is equal to or higher than a predetermined threshold value. In step S14, when the voltage of the capacitor 44 is equal to or higher than the predetermined threshold value, the process proceeds to step S17. On the other hand, when the voltage of the capacitor 44 is lower than the predetermined threshold in step S14, the process proceeds to step S15.

  In step S15, a pre-response charging process is performed. That is, in step S15, the charging process execution unit 45i temporarily switches the charging circuit switch from OFF to ON. The power of the battery 43 is boosted by a booster circuit and stored in the capacitor 44. Thereafter, the process proceeds to step S16.

  In step S16, the detection flag is cleared. In other words, the detection flag is lowered in step S16. Thereafter, the process proceeds to step S17.

  In step S17, command reception processing is executed (see FIG. 8). Thereafter, the process proceeds to step S18.

  In step S18, it is determined whether or not a predetermined time (third predetermined time) has elapsed. Here, the predetermined time is 1 millisecond from the timing when the active mode is set. If the predetermined time has not elapsed in step S18, the process returns to step S17. On the other hand, if the predetermined time has elapsed in step S18, the process proceeds to step S19.

  In step S19, the sleep mode is set by the mode setting unit 45d. That is, the operation mode is switched from the active mode to the sleep mode by the mode setting unit 45d. Thereby, ESL40 is switched to the state which cannot receive the infrared signal sent from the transceiver 30. FIG. Then, it returns to step S11.

(4-2) Flow of Command Acceptance Processing Next, the flow of command acceptance processing will be described with reference to FIG.

  First, in step S21, it is determined whether or not there is a command (transmission command) transmitted from the ESL server 10. Specifically, in step S21, it is determined whether there is an infrared signal transmitted from the transceiver 30. If there is no transmission command in step S21, the process ends. On the other hand, if there is a transmission command in step S21, the process proceeds to step S22.

  In step S22, it is determined whether or not the transmission command is addressed to itself. Specifically, in step S22, it is determined whether or not the device ID added to the command matches the own device ID. If the device ID added to the command is different from its own device ID in step S22, the process ends. On the other hand, if the device ID added to the command matches the own device ID in step S22, the process proceeds to step S23.

  In step S23, a command is accepted. That is, a command is received and stored by the information receiving unit 45a. The display content update unit 45c updates the display content based on the command. Thereafter, the process proceeds to step S24.

  In step S24, a response signal is transmitted by the response signal transmitter 45b. The response signal is sent from the communication unit 41 to the ESL server 10 via the transceiver 30 and the base station 20. Thereafter, the process proceeds to step S25.

  In step S25, the post-response charging process is executed by the charging process execution unit 45i. That is, the charging process execution unit 45i temporarily switches the charging circuit switch from OFF to ON. The power of the battery 43 is boosted by a booster circuit and stored in the capacitor 44.

(4-3) Flow of Voltage Detection Timer Process Next, the flow of the voltage detection timer process will be described with reference to FIG.

  First, in step S31, it is determined whether or not a predetermined time (first predetermined time) counted by the second timer unit 45g has elapsed. Specifically, in step S31, the process waits until a predetermined time (specifically, 1 hour) elapses. When the predetermined time elapses, the process proceeds to step S32.

  In step S32, a detection flag is set by the detection flag setting unit 45e. In other words, in step S32, the detection flag setting unit 45e sets a detection flag. Thereafter, the process proceeds to step S33.

  In step S33, the second timer unit 45g is stopped. Thereafter, the process proceeds to step S34.

  In step S34, it is determined whether or not the detection flag is cleared. In step S34, if the detection flag is not cleared, the process waits until the detection flag is cleared. If the detection flag is cleared, the process proceeds to step S35.

  In step S35, counting by the second timer unit 45g is started. Then, it returns to step S31.

(5) Features (5-1)
In the electronic shelf label system 1 according to the above embodiment, the electric power supplied from the battery 43 is stored in the capacitor 44. The voltage of the capacitor 44 is detected by the voltage detector 45h. The charging process is performed based on the voltage of the capacitor 44 detected by the voltage detection unit 45h.

  In the conventional electronic shelf label system, the ESL stores electric power necessary for transmitting the response signal, and therefore, charging is performed before transmitting the response signal. Specifically, the ESL started charging the capacitor at the timing when the wakeup signal from the ESL server was detected. That is, all ESLs that have detected the wake-up signal have started the charging process. As a result, even when the ESL does not transmit a response signal to the ESL server, the capacitor is charged. In other words, the ESL that is not the target to which the command is transmitted has started the charging process even though it is not necessary to transmit the response signal. As a result, useless current consumption occurs in the ESL.

  However, in the electronic shelf label system 1 according to the above embodiment, the charging process of the capacitor 44 is performed based on the voltage of the capacitor 44 detected by the voltage detection unit 45h. That is, even when the ESL 40 detects the wakeup signal, the ESL 40 performs the charging process of the capacitor 44 in consideration of the voltage of the capacitor 44 detected by the voltage detection unit 45h. Thereby, useless current consumption can be suppressed and consumption of the battery can be suppressed.

(5-2)
Further, in the electronic shelf label system 1 according to the above-described embodiment, the voltage of the capacitor 44 is detected at the first predetermined time interval by the voltage detection unit 45h. Moreover, it is preferable that the charge process execution part 45i performs the charge process of the capacitor | condenser 44, when the voltage of the capacitor | condenser 44 detected by the voltage detection part 45h is lower than a predetermined threshold value. Here, the predetermined threshold value is a voltage value at which the response signal can be transmitted once.

  In the conventional electronic shelf label system, the charging process is executed regardless of the voltage of the capacitor. However, if a voltage that can transmit the response signal remains, it is not necessary to perform the charging process before transmitting the response signal. In the electronic shelf label system 1 according to the above embodiment, the ESL 40 executes the charging process before transmitting the response signal only when the charging process is really necessary (pre-response charging process). Thereby, useless charging processing can be suppressed.

(5-3)
Furthermore, in the electronic shelf label system 1 according to the above embodiment, the charging process execution unit 45i further performs the charging process of the capacitor 44 after the response signal is transmitted to the ESL server 10 by the response signal transmission unit 45b. .

  When the voltage of the capacitor 44 is reduced by the voltage detection timing and the voltage required for response signal transmission cannot be secured, even if response signal transmission processing is executed by the response signal transmission unit 45b, The response signal does not reach the transceiver 30. If the response signal does not reach the transceiver 30, the ESL server 10 retries command transmission. Therefore, the command is transmitted again from the ESL server 10 via the transceiver 30. The ESL 40 according to the above-described embodiment is configured to execute a charging process (post-response charging process) after executing a response signal transmission process. As a result, when the command is retransmitted from the ESL server 10, the capacitor 44 is charged, and a response signal can be transmitted in response to the retransmitted command. As a result, the ESL server 10 can confirm the receipt of the command by the ESL 40 at an early stage.

(5-4)
In the electronic shelf label system 1 according to the embodiment, the active mode and the sleep mode of the ESL 40 are alternately set by the mode setting unit 45d. The mode setting unit 45d switches between the active mode and the sleep mode so that the active mode is set at the second predetermined time interval. The second predetermined time interval is a time interval shorter than the first predetermined time interval. The active mode is a mode in which an infrared signal can be received. The sleep mode is a mode in which an infrared signal cannot be received. In addition, the charging process execution unit 45i is the capacitor 44 after the active mode is set by the mode setting unit 45d and when the voltage of the capacitor 44 lower than a predetermined threshold is detected by the voltage detection unit 45h. The charging process (pre-response charging process) is performed.

  Since the ESL 40 is driven by the power supplied by the battery, if the active mode is always set, the battery is consumed significantly. On the other hand, since the ESL 40 also accepts input of commands from an operator using a portable terminal (remote controller) or the like, if the sleep mode is set for a long time, the responsiveness is poor. Therefore, the ESL 40 switches between the active mode and the sleep mode so that the active mode is set at the second predetermined time interval (approximately one second interval). Here, in the above embodiment, the charging process of the capacitor 44 is executed when the voltage detected by the voltage detection unit 45h is lower than a predetermined threshold value in the active mode.

  Thereby, since a charging process can be performed at the timing of active mode, energy-saving efficiency can be improved. In addition, since the charging process can be performed only on the capacitors that require the charging process, wasteful current consumption can be suppressed.

(5-5)
Further, in the electronic shelf label system 1 according to the above-described embodiment, the charging process execution unit 45i performs the charging process of the capacitor 44 in accordance with the timing when the active mode is set by the mode setting unit 45d. Thereby, power consumption can be suppressed more effectively.

(6) Modification (6-1) Modification A
In the electronic shelf label system 1 according to the above embodiment, in order to suppress the consumption of the battery 43, the charging process of the capacitor 44 is executed after transmitting the response signal, and further, the first predetermined time interval (for example, 1 When the voltage of the capacitor 44 is lower than a predetermined threshold at every hour), the capacitor 44 is charged.

  Here, in order to suppress the consumption of the battery 43, the following configuration may be provided instead of the configuration of the electronic shelf label system 1 according to the embodiment.

  In the ESL server, when transmitting a command to the ESL 40, the information transmission unit 52c transmits a device ID list and transmission timing prior to the command. The device ID list is a list indicating the device ID of the ESL 40 that is a command transmission target. The transmission timing indicates the timing at which a command is transmitted for all ESLs 40 listed in the device ID list.

  Specifically, the ESL server continuously transmits a timer signal for notifying the transmission timing of the device ID list for one second before transmitting data such as the device ID list. The ESL 40 checks the infrared rays related to the timer signal sent from the transceiver 30 every second. The ESL 40 detects infrared rays and receives a timer signal. Thereafter, the mode setting unit 45d sets the sleep mode. The mode setting unit 45d switches the operation mode to the active mode in accordance with the transmission timing of the device ID list indicated by the timer signal, and receives the device ID list.

  Here, if the received device ID list includes its own ID, the capacitor 44 is charged in advance in accordance with the transmission timing for the own ID. Thereafter, a command is received by the information receiving unit 45a, and a response signal is transmitted by the response signal transmitting unit 45b and a display update by the display content updating unit 45c is executed. On the other hand, if the received device ID list does not include its own ID, it waits in the sleep mode until the entire communication is completed.

  Thereby, the charging process of the capacitor 44 is performed at a timing when only the ESL whose display contents are to be updated is necessary. This can also prevent wasteful battery consumption.

(6-2) Modification B
Moreover, in order to suppress useless battery consumption, the following configuration may be employed instead of the configuration described in the above embodiment and Modification A.

  The ESL 40 executes a charging process for the capacitor 44 in response to the charging command sent from the ESL server 10. The charge command is a command for instructing a charging process. The ESL 40 that has received the charging command executes the charging process both at the timing before the response signal transmission and after the response signal transmission.

  Specifically, the ESL server 10 transmits a charge command for instructing charging of the capacitor 44 to the ESL 40 that is a command transmission target at an arbitrary timing prior to an update command for instructing update of display contents. The device ID of the ESL 40 to be commanded is added to the charging command. The ESL 40 receives the charge command to which the same device ID as the self device ID is added, and executes the charging process. In addition, after receiving the update command, the ESL 40 performs further charging processing.

  Thus, even when a plurality of commands are transmitted to the same ESL during one wakeup, only one command is required to prompt charging of the capacitor 44.

  Conventionally, the ESL generally performs a charging process on the capacitor 44 even when communication is performed so as not to return a response signal with an external device. For example, when a command such as a back screen display from a portable terminal is received, the charging process is performed even though a response signal is not transmitted to the portable terminal. However, the charging process for the capacitor 44 may be performed only when the process for transmitting the response signal is performed. Thereby, battery consumption can be further reduced.

(6-3) Modification C
The electronic shelf label system 1 according to the above embodiment may be used together with other systems. For example, the other system is a POS system. The POS system is a system that collects and analyzes information related to the sale of products at the time of sale. The POS system mainly includes a plurality of registers and a POS server. The register pays for the goods. In the POS server, information related to products settled in a plurality of registers is collected. By using it together with the electronic shelf label system 1 and the POS system, it is possible to comprehensively manage product information such as product prices and product information such as the number of products sold and the number of stocks.

(6-4) Modification D
In addition, the ESL 40 according to the above embodiment may further include input means (for example, a switch, a button, etc.). The input means is attached to the frame body 40a and can be directly input by an operator.

(6-5) Modification E
In ESL40 concerning the above-mentioned embodiment, control device 45 is constituted by CPU, ROM, and RAM, and functions as a plurality of functional parts 45a-45i based on a program memorized by ROM.

  Here, the control apparatus 45 is not restricted to what is comprised by CPU, ROM, and RAM. For example, the control device 45 may be configured by an ASIC. That is, the control device 45 may have any configuration as long as it functions like the control device 45 described above.

(6-6) Modification F
In ESL40 which concerns on the said embodiment, the timing which switches an operation mode was obtained based on the time counted by the 1st timer part 45f. Specifically, the first timer unit 45f counts the second predetermined time and the third predetermined time, and the mode setting unit 45d performs the second predetermined time from the timing when the active mode is set first. The operation mode was switched so that the next active mode was set after the elapse of time, and the sleep mode was set at a third predetermined time after the active mode was set. Further, the second predetermined time was about 1 second and the third predetermined time was about 1 millisecond.

  Here, the second predetermined time and the third predetermined time are arbitrary times and may be appropriately changed by the operator. In addition, the second predetermined time and the third predetermined time may be counted by different timer units.

1 Electronic shelf label system 10,110 ESL server (server)
DESCRIPTION OF SYMBOLS 11 Communication part 12 Display part 13 Input part 14 Output part 15 Control apparatus 20 Base station 30 Transceiver (communication apparatus)
40 ESL (electronic shelf label)
41 Communication unit (receiving unit)
42 display unit 43 battery 44 capacitor 45 control device 45a information receiving unit 45b response signal transmitting unit (transmitting unit)
45c Display content update unit 45d Mode setting unit 45e Detection flag setting unit 45f First timer unit 45g Second timer unit 45h Voltage detection unit (detection unit)
45i charge processing execution part

Special table 2002-516430 gazette

Claims (5)

An electronic shelf label that is arranged in association with a product and displays product information related to the product,
A server that stores association information between the product information and the electronic shelf label;
A communication device that transmits an infrared signal including the product information to the electronic shelf label based on the association information of the server;
With
The electronic shelf label
A receiving unit for receiving the infrared signal transmitted from the communication device;
When the infrared signal is received by the receiver, a transmitter that transmits a response signal to the server;
A battery as a power source;
A capacitor for storing electric power supplied from the battery;
A detector for detecting the voltage of the capacitor;
Based on the voltage of the capacitor detected by the detection unit, a charging process execution unit that performs a charging process of the capacitor;
Having
Electronic shelf label system. The detection unit detects the voltage of the capacitor at a first predetermined time interval,
The charging process execution unit performs the capacitor charging process when the voltage of the capacitor detected by the detection unit is lower than a predetermined threshold.
The electronic shelf label system according to claim 1. The charging process execution unit further performs a charging process of the capacitor after a response signal directed to the server is transmitted by the response signal transmission unit.
The electronic shelf label system according to claim 1 or 2. The electronic shelf label
A mode setting unit that alternately sets an active mode in which the infrared signal can be received and a sleep mode in which the infrared signal cannot be received;
The mode setting unit sets the active mode at a second predetermined time interval that is a time interval shorter than the first predetermined time interval,
The charging process execution unit is after the active mode is set by the mode setting unit and when the voltage of the capacitor lower than the predetermined threshold is detected by the detection unit. Charging process,
The electronic shelf label system according to any one of claims 1 to 3. The charging process execution unit performs the capacitor charging process in accordance with the timing when the active mode is set by the mode setting unit.
The electronic shelf label system according to claim 4.

Images