JP2007244795A - Electronic shelf label system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ESL (Electronic Shelf Label) system capable of using up batteries without leaving a large amount of residual power. <P>SOLUTION: This ESL system displays price information related to the prices of articles on a bistable display 21. This ESL system includes first and second batteries 51 and 52 supplying a power for changing a display to the display 21, a changeover control means 26 and 50 changing over the power supply to the display 21 from the first battery 51 to the second battery 52 when the residual power of the first battery 51 becomes smaller than a prescribed threshold, and a display control means 20 setting mutually different display contents between a first state supplying the power from the first battery 51 to the display 21 and a second state supplying the power from the second battery 52 to the display 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic shelf label system that displays information such as the price of a product in the vicinity of the sales floor of the product.

In recent years, proposals have been made to adopt an electronic shelf label system (hereinafter referred to as an ESL system) in a sales floor. In such an ESL system, each electronic shelf label installed in the sales floor communicates with the management device at the headquarters via wireless communication means and the like, and display contents are set. Each electronic shelf label is driven by a battery for each electronic shelf label. For this reason, when the remaining battery capacity is reduced, an alarm is displayed (Patent Documents 1 and 2).
JP 2001-250166 A JP 2001-195660 A

  However, in the inventions of Patent Documents 1 and 2, when the battery is completely exhausted, the alarm display itself disappears, so that it is not possible to know whether the electronic shelf label is out of order or the battery is exhausted.

  On the other hand, it is conceivable to employ a so-called bistable display as the electronic shelf label. The bistable display device can change the display content by applying a voltage equal to or higher than a predetermined threshold, and can stably maintain the display content without applying power. Examples of the bistable display include electronic paper such as a cholesteric liquid crystal display.

  According to such a display, display contents can be maintained semi-permanently even when the battery runs out. However, since the display contents cannot be rewritten after the battery is depleted, the information becomes obsolete over time (for example, price). In this case, there is a risk of loss of trust or confusion in the sales floor.

  Therefore, as shown in FIG. 8A, when a threshold value Va having a value slightly larger than the rewritable voltage Vb of the display is set, and the remaining power VD of the battery becomes smaller than the threshold value Va. It is conceivable to rewrite the display indicating that the battery is dead.

  By the way, in the case of a bistable display, since many elements are inverted at the time of rewriting, the power consumption at the time of rewriting increases rapidly. On the other hand, in order to reduce the size and weight of the battery, a battery having a small capacity such as a button-type battery is generally used. Therefore, when the power consumption is large, the voltage drops rapidly. For example, as shown in FIG. 8A, the voltage temporarily decreases by Vd1 during the rewriting of the display, and the voltage gradually recovers after the rewriting is completed.

Moreover, as a characteristic of the battery, the internal impedance tends to increase as the battery temperature decreases. Therefore, when the display is rewritten at a low temperature such as at night in winter, as shown in FIG. 8B, the battery voltage VD is greatly reduced by the voltage Vd2 by rewriting the display. In some cases, the voltage may be lower than the rewritable voltage Vb. In this case, the display device may not be rewritten. The degree of decrease in the voltage VD varies due to product differences among manufacturers and individual differences among batteries, and the power consumption increases as the number of elements of the display increases.
Considering these various factors, the threshold value Va needs to be set to a larger value with a margin than the rewritable voltage Vb.

  However, the battery voltage rises as shown by the curve VDu in FIG. 8B when the rewriting is completed and no load is applied. Therefore, when the threshold value Va is set to a large value, the remaining capacity is reduced without using up the battery. It is uneconomical because it will be replaced with a large amount. In addition, since the frequency of battery replacement increases, not only the purchase cost of the battery but also the labor cost for battery replacement is significantly increased. In particular, large stores and the like use an enormous number of electronic shelf labels, so a great increase in cost is inevitable.

  Accordingly, an object of the present invention is to provide an ESL system that can be used up without much remaining battery power remaining.

  In order to achieve the above object, the ESL system of the present invention supplies power for changing the display to the display in the ESL system in which price information related to the price of the product is displayed on the bistable display. Switching to switch the power supply from the first battery to the second battery when the remaining power of the first and second batteries and the first battery become smaller than a predetermined threshold. Control means, and display control means for setting different display contents in a first state in which power is supplied from the first battery to the display and in a second state in which power is supplied from the second battery to the display. I have.

  According to the present invention, when the remaining power of the first battery becomes smaller than a predetermined threshold, the power supply to the display is switched from the first battery to the second battery. It can be made as small as possible. As a result, the remaining power of the first battery can be used without much remaining, so that the battery replacement time is extended and the replacement frequency is reduced. Therefore, the purchase cost of the battery and the labor cost for battery replacement can be greatly reduced.

  On the other hand, as described above, the display content of the bistable display device remains without being erased when no voltage is applied. Therefore, it is possible to easily know the replacement time of the first battery by displaying different display contents on the display in the first state and the second state. In addition, it is possible to rewrite the display content of the display by power supply from the second battery.

  In the present invention, it is preferable that the remaining power before use of the first battery is larger than the remaining power before use of the second battery. This is because power is always supplied from the first battery to the display, and thus the power consumption of the first battery is large.

  In the present invention, the remaining power of the second battery at the time of switching from the first battery to the second battery is greater than that of the first battery, and the power of the second battery at the time of switching. The remaining capacity is larger than the predetermined threshold value, and the display of the display can be rewritten by the second battery.

In the present invention, in the first state, the price information and product information related to the product different from the price information are displayed on the display, and in the second state, the price information of the display is erased. It is preferable to perform display according to the second state.
According to this aspect, by eliminating the price information in the second state, there is no possibility of causing unnecessary confusion to the customer. Further, as a display content corresponding to the second state, for example, by displaying that the remaining power of the first battery is small, it is possible to immediately know the necessity of battery replacement.

In the present invention, after the power supply to the display device is switched from the first battery to the second battery to delete the price information of the display device, the display according to the second state is performed. It is preferable to further include prohibiting means for prohibiting rewriting of the display on the display.
In this way, after the display according to the second state is performed, it is impossible to cause a situation where the remaining capacity of the second battery is insufficient in order to rewrite the display again. The remaining capacity can be remarkably reduced, which is economical.

  In a preferred embodiment of the present invention, the switching control means detects the remaining power capacity of the first battery, determines whether the detected remaining power capacity is smaller than the threshold value, and determines the remaining power capacity. It is preferable to include a confirmation unit that outputs a switching signal when is smaller than the threshold value, and a switching unit that switches the power supply from the first battery to the second battery by the switching signal from the confirmation unit.

Hereinafter, an ESL system according to a first embodiment of the present invention will be described with reference to the drawings.
System configuration:
First, an outline of the present ESL system and a store management system including the ESL system will be described.
The store management system shown in FIG. 1 is a system that performs a series of data processing such as merchandise management and sales aggregation employed in a store such as a supermarket. This store management system has a store controller 3, a POS system 4, an ESL system 10 and the like connected to a LAN (Ethernet) 2 provided in the store.

  The store controller 3 is also called a store automation server, and is connected to the LAN 2 as a central control device for the entire store management system. In the store controller 3, there is a product master file 3a composed of product information such as the product name and product price of each product and the company code (product code) given to each product. Based on the product master file 3a, the store controller 3 performs management related to each operation in the store, such as product price management, inventory management, injection warehouse management, and sales management. When the store is one store of the supermarket chain, the merchandise master file 3a is normally sent from the headquarters of the chain to the store controller 3 of each store.

  The POS system 4 mainly includes a POS server 5 and a plurality of electronic cash registers (hereinafter referred to as ECR) 6 which are POS terminals. However, depending on the system configuration, the store controller 3 may have the function of the POS server 5 and the installation of the POS server 5 may be omitted.

  Each ECR 6 is arranged at a cash register where the shopper actually pays for the product, and is connected to the POS server 5. The ECR 6 reads a company code (bar code) attached to a product with a scanner (not shown) and displays information related to the company code. The ECR 6 performs departmental registration, display on a display unit, and print output by a printer, and transmits the registered data to the POS server 5. The POS server 5 accumulates the registration data from each ECR 6 in the aggregation file, manages the sales information of the product based on the aggregation file, and transmits it to the store controller 3.

  As shown in FIG. 1, the ESL system 10 mainly includes an ESL server 11 (an example of a control device of the headquarters), a base station 12 that is a repeater, a plurality of transceivers 13 that are transceivers, and each transceiver 13. A plurality of electronic shelf labels (hereinafter referred to as ESL) 14 are arranged for each.

  The ESL server 11 is installed in the headquarters (back room) in the store and is a control device that controls the ESL system 10. The ESL server 11 is wirelessly connected to each ESL 14 via the base station 12 and the transceiver 13.

  The transceiver 13 is a wireless communication device that has both a function of transmitting to the ESL 14 and a function of receiving a feedback signal from the ESL 14. The transceiver 13 transmits, to the ESL server 11, product information (described later) held by the ESL server 11 by radio using infrared rays and the like, and receives a feedback signal from each ESL 14 and transmits it to the ESL server 11.

  The ESL 14 is arranged in the vicinity of each commodity displayed on the sales floor in the store, and replaces the conventional paper price tag. That is, each ESL 14 displays price information related to the price of a product and product information related to a product different from the price information, as will be described later. The size and shape of each ESL 14 can be selected to some extent according to the sales floor and the product.

  As shown in FIG. 2A, the ESL server 11 includes a CPU 41, a ROM 42, a RAM 43, and an HDD (hard disk; storage unit) 44. The ESL server 11 is connected to a display unit 45, an operation input unit (keyboard) 46, a scanner 47, and the like through an interface (not shown).

  When the ESL system 10 is started up, a product information file 48 is created in the HDD 44 of the ESL server 11. As shown in FIG. 2B, the product information file 48 includes a company code unique to the product, an ESL code unique to each ESL 14, the product name, the normal price of the product, and the sale price of the product at the time of sale. The sale period of the product, the selection number of the display contents (layout) of the ESL 14 and the rewrite prohibition flag are stored in association with each other for each product. The product information file 48 is created based on information obtained from the product master file 3 a of the store controller 3 and information obtained from the actual sales price data of the POS server 5.

  The product information file 48 is updated based on the update information every time the product master file 3a of the store controller 3 in FIG. 1 is updated. That is, when the sale period is reached, or when the sale period ends and the product information is updated in the product master file 3a, the product information file 48 of the ESL server 11 is automatically updated accordingly. When the information of the product information file 48 is updated, the ESL server 11 transmits the change of the product information to each corresponding ESL 14 via the base station 12 and the transceiver 13. The ESL server 11 transmits the change of the product information only to the ESL 14 whose value in the rewrite prohibition flag column of the product information file 48 is “0” (rewritable).

  As will be described later, the ESL 14 that has received the product information performs display based on the product information. As for the display contents of the ESL 14, for a product for which a normal price and a special sale price are set, the display for the normal price in FIG. 3B and the display for the special sale price in FIG. Settings are registered, and display contents can be set by designating “display content selection No.” in the product information file 48. Therefore, the display content and layout other than the price can be easily changed by a simple operation between the sales at the normal price and the sales at the sale price.

As will be described later, when the ESL server 11 of FIG. 1 receives the rewrite prohibition signal from the ESL 14, the rewrite prohibition flag field of the ESL code of the product information file 48 corresponding to the ESL14 of FIG. “1” is stored, and the transmission of the change of the product information is prohibited only to the ESL 14.
Accordingly, the CPU 41 of the ESL server 11 and the rewrite prohibition flag storage unit of the product information file 48 in FIG. 1 constitute prohibiting means for prohibiting rewriting of the display of the bistable display 21 of the ESL 14.

ESL14:
Next, the ESL 14 that is a main part of the present invention will be described in detail.
As shown in FIG. 3A, each ESL 14 includes a CPU (an example of display control means) 20, a bistable display 21, a wireless receiver 22, a wireless transmitter 23, a transmitter / receiver circuit 24, a memory 25, a battery. A monitoring circuit (an example of confirmation means) 26, a switching unit 50, a first battery 51, a second battery 52, and the like are included. The ESL 14 is operated by electric power supplied from the first battery 51 in a normal time.

  The ESL 14 includes a display function, a reception function, a comparison function, a transmission function, and the like, and the CPU 20 controls these functions. The memory 25 stores an ESL code unique to each ESL 14. The CPU 20 compares the ESL code included in the product information from the transceiver 13 received by the wireless receiving unit 22 with the ESL code set in itself, and the price information and product information received when the two match. Is updated and displayed on the bistable display 21. In this case, previously displayed product information is cleared, and new product information is stored in the memory 25. In addition, after receiving the product information from the transceiver 13 and updating the display, the ESL 14 transmits a feedback signal indicating that the processing is normally completed from the wireless transmission unit 23 to the transceiver 13 (FIG. 1).

Bistable display 21:
The bistable display 21 is configured by using a bistable device such as electronic paper using cholesteric liquid crystal. Therefore, the bistable display 21 does not require power for maintaining the display of characters and figures once drawn on the screen, and thus can be operated with low power consumption.

As shown in FIG. 4 (a), the bistable display 21 is based on the product information received from the ESL server 11 (FIG. 2), and the price information related to the price of the product and the products other than the price information. Display product information.
As the price information, for example, first to third price information 31 to 33 are displayed. As the first price information 31, the actual sale price (sale price) of the product is displayed. As the second price information 32, the normal price of the product is displayed. As the third price information 33, characters “normal price” indicating that the display of the second price information 32 is a normal price are displayed.

As product information other than the price information, for example, first to third product information 34 to 36 are displayed. As the first product information 34, a limited number of products is displayed. As the second product information 35, a product name is displayed. As the third product information 36, a POP advertisement is displayed for a product such as a special sale.
In addition, as other product information, in the case of a product whose price is determined by weight or number, the unit price for each weight or number of products may be displayed.

Battery monitoring circuit 26:
The battery monitoring circuit 26 in FIG. 3A is provided for each ESL 14 and checks the remaining power capacity of the first battery 51 of each ESL 14. The battery monitoring circuit 26 detects the remaining power capacity of the first battery 51 at predetermined intervals, and when the remaining power capacity of the first battery 51 is sufficient, that is, the remaining power capacity is the threshold value shown in FIG. When it is larger than Vc, the result is not transmitted to the CPU 20. The threshold value Vc can activate, for example, the CPU 20, the wireless reception unit 22, the wireless transmission unit 23, the transmission / reception circuit 24, the memory 25, and the battery monitoring circuit 26, that is, other than the bistable display 21. The voltage is set.
In addition, about the confirmation method of the electric power remaining capacity of a battery, the method currently disclosed by the paragraphs (0015)-(0026) of the said patent document 1, FIG. 2, and patent document 2 is employable, for example.

Switching control means:
The battery monitoring circuit 26 transmits a switching signal to the CPU 20 and the switching unit 50 when the remaining power of the first battery 51 becomes smaller than a predetermined threshold value Vc. When the switching unit 50 receives the switching signal from the battery monitoring circuit 26, the switching unit 50 switches the power supply to the bistable display 21 from the first battery 51 to the second battery 52.
Therefore, the battery monitoring circuit 26 and the switching unit 50 constitute switching control means for switching the supply of power to the bistable display 21 from the first battery 51 to the second battery 52.

  On the other hand, when receiving the switching signal from the battery monitoring circuit 26, the CPU 20 rewrites the display of the bistable display 21 with the electric power of the second battery 52 as shown in FIGS. The first to third price information 31 to 33 are deleted. At the same time, the CPU 20 of the ESL 14 in FIG. 3 transmits to the ESL server 11 an ESL code of the ESL 14 and a rewrite prohibition signal that prohibits rewriting of the bistable display 21 of the ESL 14.

Battery 51, 52:
The remaining power before the first battery 51 is used is larger than the remaining power before the second battery 52 is used. Further, the remaining power of the second battery 52 at the time of switching from the first battery 51 to the second battery 52 is set larger than that of the first battery 51 and larger than the predetermined threshold Vc, The display of the bistable display 21 is set to a rewritable electric energy. In other words, the remaining power before use of the second battery 52 is set to a capacity that allows the display of the bistable display 21 to be rewritten at least once.

Operation of ESL14:
During normal operation;
When the information in the product information file 48 in FIG. 2B is updated, the CPU 41 of the ESL server 11 shown in FIG. 2A sets the value of the rewrite prohibition flag in the product information file 48 corresponding to each corresponding ESL 14. The updated product information is transmitted only to the ESL 14 that is “0” (rewriteable).
The ESL 14 whose rewrite prohibition flag is “0” is in the first state (state in which battery replacement is unnecessary) that is operated by power supply from the first battery 51 in FIG. Based on the information, the first to third price information 31 to 33 and the first to third product information 34 to 36 shown in FIG. 4A are displayed on the bistable display 21.

When the remaining power capacity gradually decreases;
As shown in FIG. 7A, as a result of the confirmation by the battery monitoring circuit 26, the remaining power of the first battery 51 is more than the threshold value Vc due to power consumption other than the rewriting or natural discharge of the first battery 51. 3 is also transmitted, the battery monitoring circuit 26 in FIG. 3A transmits a switching signal to the CPU 20 and the switching unit 50.
When the switching unit 50 receives the switching signal from the battery monitoring circuit 26, the switching unit 50 switches the power supply to the bistable display 21 from the first battery 51 to the second battery 52. Thereby, ESL14 will be in the 2nd state (state which needs battery exchange).

  The CPU 20 erases the first to third price information 31 to 33 as shown in FIG. Thereby, even if the remaining power of the first battery 51 is reduced and the bistable display 21 cannot be rewritten by the first battery 51, the price information is displayed on the bistable display 21. So there is no risk of providing incorrect price information to consumers.

  At this time, the CPU 20 erases the first to third price information 31 to 33 and transfers a part of the first to third product information 34 to 36 to the bistable display 21. Leave it displayed. As a result, it is possible to notify store employees and system managers that the battery has run out rather than a failure of the ESL 14, and the contents of the product (for example, the product name or production) Presents consumers and producers). In particular, by continuing to display information on products other than the price of the product, such as the origin, producer name, pesticide-free, reduced pesticide, organic farming, etc. This can be communicated to the consumer.

On the other hand, the CPU 20 of the ESL 14 transmits a rewrite prohibition signal together with its own ESL code to the ESL server 11 of FIG.
When the ESL server 11 receives the ESL code and the rewrite prohibition signal, the ESL server 11 sets the value of the rewrite prohibition flag corresponding to the ESL code in the product information file 48 in FIG. 2B to “1” (rewrite prohibition), and The transmission of the product information to the ESL 14 is prohibited, and thereby the rewriting of the display on the bistable display 21 of the ESL is prohibited.

  The ESL server 11 searches the product information file 48 of FIG. 2A for product information corresponding to the ESL code that has received the rewrite prohibition signal, and uses the ESL code as shown in FIG. The product information that is included is displayed as a list on the display unit 45. Thereby, the ESL14 that has run out of battery can be grasped at the headquarters.

If the voltage is insufficient when the rewrite signal is received;
When new product information is received from the ESL server 11, the CPU 20 of the ESL 14 tries to rewrite the display content of the bistable display 21 with the new product information. However, due to the power consumption at the time of such rewriting, FIG. As shown in b), when the remaining power VD of the first battery 51 becomes smaller than the threshold value Vc, the battery monitoring circuit 26 transmits a switching signal to the CPU 20 and the switching unit 50.

When the switching unit 50 receives the switching signal from the battery monitoring circuit 26, the switching unit 50 switches the power supply to the bistable display 21 from the first battery 51 to the second battery 52. That is, the first state is switched to the second state.
On the other hand, as shown in FIG. 4B, the CPU 20 erases the first to third price information 31 to 33, and wirelessly sends a rewrite prohibition signal and its own ESL code to the ESL server shown in FIG. 11 to send.

When the ESL server 11 receives the ESL code and the rewrite prohibition signal, the ESL server 11 sets the value of the rewrite prohibition flag corresponding to the ESL code in the product information file 48 in FIG. 2B to “1” (rewrite prohibition), and Transmission of product information to the ESL 14 is prohibited.
The ESL server 11 searches the product information file 48 of FIG. 2A for product information corresponding to the ESL code that has received the rewrite prohibition signal, and includes the ESL code as shown in FIG. 2C. The product information is displayed as a list on the display 45.

Battery replacement;
When an employee performs a predetermined operation on the ESL 14 after exchanging the batteries 51 and 52 of the ESL 14 in which the remaining power capacity is reduced as shown in FIG. 3A, the ESL 14 is connected to the ESL server 11 shown in FIG. The rewritable signal and the ESL code are transmitted to.

  When the CPU 41 of the ESL server 11 receives the rewritable signal and the ESL code, the CPU 41 of the ESL server 11 changes the rewrite prohibition flag corresponding to the ESL code in the product information file 48 of FIG. 2B from “1” (rewrite prohibition) to “0” ( The product information corresponding to the ESL code is transmitted to the ESL 14.

When receiving the product information, the CPU 20 of the ESL 14 in FIG. 3A rewrites the display content of the bistable display 21 according to the product information. That is, the display content of FIG. 4B corresponding to the second state is rewritten to the display content of FIG. 4A corresponding to the first state.
The CPU 41 of the ESL server 11 deletes the ESL code and the product name from the battery exhausted ESL display screen shown in FIG.

In addition, when CPU20 of FIG. 3 receives the switching signal from the battery monitoring circuit 26, while deleting the said price information 31-33, you may make it perform the display according to the said condition. For example, as shown in FIG. 4 (c), if the mark 37 indicating battery exhaustion is displayed instead of the price information 31 to 33, it is clearly understood that the battery is exhausted rather than a failure of the ESL14. .
Further, instead of the mark 37, a text message such as “Please replace the battery” may be displayed, or a picture or pattern that the consumer does not feel uncomfortable to see may be displayed.

  By the way, in the case of a chain having a plurality of stores, the ESL server 11 is installed not in the headquarters in each store but in a chain headquarters that brings together a plurality of stores, or higher-level control that supervises the ESL server 11 in each store The device may be installed at the chain headquarters. Therefore, the “headquarter control device” in the present invention may be either a control device installed in the headquarters in each store or a control device installed in the chain headquarters. A list may be displayed on a display connected to the control device. Further, the rewrite prohibition flag may be stored for each ESL, not for each product.

  Various forms are conceivable as the batteries 51 and 52. For example, a capacitor charged by the first battery 51 may be used as the second battery 52 as shown in FIG. Further, as shown in FIG. 6, a first battery 51 that supplies power only when the bistable display 21 is rewritten and a battery 52 for a circuit other than the bistable display 21 are provided at all times. Another circuit battery 52 may be used as the second battery.

  The present invention can be applied to an ESL system mainly employed in sales stores such as supermarkets and convenience stores.

It is a schematic block diagram of the store management system containing the ESL system of Example 1 of this invention. (A) is a schematic block diagram which shows the control apparatus of the same ESL system, (b) is a chart which shows the memory content of a merchandise information file, (c) is a conceptual diagram which shows the display screen which displays a list of battery-run ESL. . (A) is a schematic block diagram which shows ESL, (b) is a front view which shows the display screen for normal prices of ESL in a 1st state. (A) is a front view which shows the display screen for sale prices in the 1st state, (b) And (c) is a front view which shows the display screen in the 2nd state which needs battery replacement. It is a schematic block diagram of ESL14 which shows a modification. It is a schematic block diagram of ESL14 which shows a modification. It is a characteristic view which shows the voltage drop of a battery and the timing of electric power remaining capacity confirmation. It is a characteristic view which shows the voltage drop of the conventional battery, and the timing of electric power remaining capacity confirmation.

Explanation of symbols

11: ESL server (head office controller)
14: ESL (electronic shelf label)
20: CPU (display control means)
21: Bistable display 26: Battery monitoring circuit (a part of confirmation means and switching control means)
29: Battery 31-33: Price information 34-36: Product information 45: Head office indicator 50: Switching section (part of switching control means)
51: First battery 52: Second battery Vc: Predetermined threshold

Claims (6)

In an electronic shelf label system that displays price information on the price of goods on a bistable display,
First and second batteries for supplying power for changing the display to the display;
Switching control means for switching the supply of power to the display from the first battery to the second battery when the remaining power of the first battery becomes smaller than a predetermined threshold;
An electronic shelf comprising display control means for setting different display contents in a first state in which power is supplied from the first battery to the display and in a second state in which power is supplied from the second battery to the display Tag system.   2. The electronic shelf label system according to claim 1, wherein a remaining power before use of the first battery is larger than a remaining power before use of the second battery.   3. The second battery according to claim 1 or 2, wherein a remaining power of the second battery at the time of switching from the first battery to the second battery is larger than that of the first battery, and the second battery at the time of switching. The electronic shelf label system is characterized in that the remaining power of the display is larger than the predetermined threshold value, and the display of the display can be rewritten by the second battery. In any one of Claims 1-3, in the said 1st state, the said price information and the merchandise information regarding goods different from this price information are displayed on the said indicator,
In the second state, the price information of the display is erased, and the electronic shelf label system is configured to display according to the second state.   In Claim 4, after switching the electric power feeding to the said display device from the said 1st battery to the said 2nd battery and deleting the price information of the said display device, and performing the display according to the said 2nd state Is an electronic shelf label system further comprising prohibition means for prohibiting rewriting of the display of the display.   The switching control means according to any one of claims 1 to 5, wherein the switching control means detects a remaining power capacity of the first battery and determines whether or not the detected remaining power capacity is smaller than the threshold value. An electronic shelf label including a confirmation unit that outputs a switching signal when the remaining power capacity is smaller than the threshold, and a switching unit that switches the power supply from the first battery to the second battery by the switching signal from the confirmation unit. system.