Information display system, information display device, and information display method

Abstract

To provide an information display system, an information display device, and an information display method capable of attaining predetermined high functionality.SOLUTION: An information display system includes a non-volatile display device that is powered by a wireless tag and rewrites display on the basis of a first signal transmitted from the wireless tag, a reader device that wirelessly supplies power to the wireless tag and transmits a second signal to the wireless tag, and the wireless tag that supplies power to the non-volatile display device on the basis of power wirelessly supplied from the reader device, obtains measurement information related to measurement performed by an external measurement device on the basis of the second signal transmitted from the reader device, and transmits a first signal corresponding to the measurement information to the non-volatile display device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an information display system, an information display device, and an information display method, and more particularly to an information display system, an information display device, and an information display method for displaying information obtained outside a display unit on the display unit. [Background technology]

[0002] Display devices (electronic paper) that utilize electrophoresis have existed for some time. The technology described in Patent Document 1 is related to such electronic paper, and includes an RFID tag and a display unit. The RFID tag includes a loop antenna and an integrated circuit. The RFID tag is driven by power generated by receiving electromagnetic waves from the outside using the loop antenna. That is, the RFID tag drives its own integrated circuit by power wirelessly supplied from the outside. The integrated circuit controls the display unit of the electronic paper, and changes the screen displayed on the display unit based on that control. That is, the RFID tag's integrated circuit operates based on power wirelessly supplied from the outside, and displays an initial screen on the display unit based on that operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-156618 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for more advanced functions, and there have been cases where it has been desirable to use integrated circuits arranged in electronic paper to perform various calculations and display the results of those calculations on a display unit. However, when attempting to improve the functionality of electronic paper as described above, the power supplied wirelessly to the electronic paper is insufficient to perform various calculations and rewrite the display based on the results of those calculations, making it impossible to improve the functionality of the electronic paper.

[0005] An object of the present invention is to provide an information display system, an information display device, and an information display method that can achieve a predetermined high level of functionality with relatively low power consumption. [Means for solving the problem]

[0006] One embodiment of an information display system includes a non-volatile display device that is powered by a wireless tag and rewrites a display based on a first signal transmitted from the wireless tag, a reader device that wirelessly supplies power to the wireless tag and transmits a second signal to the wireless tag, and a wireless tag that powers the non-volatile display device based on the power wirelessly supplied from the reader device, and acquires measurement information related to measurement performed by an external measuring device based on the second signal transmitted from the reader device, and transmits a first signal corresponding to the measurement information to the non-volatile display device.

[0007] An information display device of one embodiment includes a non-volatile display device that is powered by a wireless tag and rewrites a display based on a first signal transmitted from the wireless tag, and a wireless tag that powers the non-volatile display device based on power wirelessly supplied from an external device, acquires measurement information related to measurement performed by an external measurement device, and transmits a first signal corresponding to the measurement information to the non-volatile display device.

[0008] In one embodiment of the information display method, the method is performed in an information display system including a non-volatile display device, a reader device, and a wireless tag, and includes the steps of: the non-volatile display device being powered by the wireless tag and rewriting the display based on a first signal transmitted from the wireless tag; the reader device wirelessly powering the wireless tag and transmitting a second signal to the wireless tag; and the wireless tag powering the non-volatile display device based on the power wirelessly supplied from the reader device, acquiring measurement information related to measurement performed in an external measurement device based on the second signal transmitted from the reader device, and transmitting a first signal corresponding to the measurement information to the non-volatile display device. Effect of the Invention

[0009] One embodiment of the information display system comprises a non-volatile display device that is powered by a wireless tag and rewrites the display based on a first signal transmitted from the wireless tag, a reader device that wirelessly supplies power to the wireless tag and transmits a second signal to the wireless tag, and a wireless tag that transmits power wirelessly from the reader device to the non-volatile display device and acquires measurement information related to measurement performed by an external measuring device based on the second signal and transmits a first signal including the measurement information to the non-volatile display device, thereby achieving a certain level of high functionality with relatively low power consumption. The information display device and the information display method according to the embodiment can achieve the same effects as those of the information display system according to the embodiment described above. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating an information display system according to an embodiment. [Diagram 2] 1 is a block diagram illustrating a wireless tag according to an embodiment. [Diagram 3] FIG. 2 is a block diagram for explaining an external measurement device according to an embodiment. [Figure 4] FIG. 2 is a diagram for explaining a first specific example of an external measuring device. [Diagram 5] FIG. 13 is a diagram for explaining a third specific example of an external measuring device. [Figure 6] 1 is a first timing chart for explaining an information display method according to an embodiment. [Figure 7] 11 is a second timing chart for explaining an information display method according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, one embodiment of the present invention will be described. In this specification, the term "information" is used, but the term "information" can be replaced with "data" and the term "data" can be replaced with "information".

[0012] [Outline of Information Display System 1] First, an overview of an information display system 1 according to an embodiment will be described. FIG. 1 is a diagram illustrating an information display system 1 according to an embodiment.

[0013] The information display system 1 includes a non-volatile display device 100, a reader device 200, an external measuring device 300, and a wireless tag 400. An information display device may be configured by the reader device 200 and the wireless tag 400. Also, an information display device may be configured by the reader device 200, the external measuring device 300, and the wireless tag 400.

[0014] The nonvolatile display device 100 may be, for example, electronic paper. Such a nonvolatile display device 100 is supplied with power from a wireless tag 400 and receives a first signal transmitted from the wireless tag 400. The nonvolatile display device 100 rewrites the display on the display unit 101 based on the first signal. Here, the first signal may be a high-frequency signal. In this case, the nonvolatile display device 100 may be wirelessly powered based on, for example, the high-frequency electromagnetic waves of the first signal.

[0015] The reader device 200 may be, for example, a laptop, a tablet, or a smartphone. The reader device 200 wirelessly supplies power to the wireless tag 400. The reader device 200 also transmits a second signal including information for instructing the wireless tag 400 to rewrite an image displayed on the nonvolatile display device 100. The reader device 200 may transmit, as the second signal, a signal including information for instructing the nonvolatile display device 100 to display a measurement result of a physical quantity measured by the external measuring device 300 and a calculation result related to the physical quantity, to the wireless tag 400.

[0016] The external measuring device 300, for example, measures and calculates a predetermined physical quantity, and transmits a fourth signal to the wireless tag 400, the fourth signal including information for displaying the measurement results and calculation results on the non-volatile display device 100, i.e., information (measurement information) instructing the display unit 101 of the non-volatile display device 100 to be rewritten based on the calculation results. The external measuring device 300 may transmit the measurement information (fourth signal) including the measurement result and the calculation result to the wireless tag 400 at a predetermined timing, for example. The predetermined timing may be, for example, a timing at every predetermined period, or a timing at which a third signal corresponding to the second signal is received from the wireless tag 400.

[0017] The wireless tag 400 functions as, for example, a signal hub. When the wireless tag 400 receives the second signal from the reader device 200, the wireless tag 400 transmits the first signal including the results of the measurement and calculation performed by the external measuring device 300 (measurement information) to the nonvolatile display device 100. In this case, for example, if the wireless tag 400 receives measurement information in advance transmitted from the external measuring device 300, when it receives the second signal from the reader device 200, it may include the measurement information in a first signal and transmit it to the non-volatile display device 100. Alternatively, for example, when the wireless tag 400 receives a second signal from the reader device 200, the wireless tag 400 may transmit the second signal as a third signal to the external measurement device 300. When the wireless tag 400 receives a fourth signal including measurement information from the external measurement device 300, the wireless tag 400 transmits the fourth signal to the nonvolatile display device 100 as a first signal. Furthermore, when the wireless tag 400 is wirelessly powered by the reader device 200, the wireless tag 400 supplies the power to the non-volatile display device 100. An example of the wireless tag 400 may be an RFID tag or the like.

[0018] [Details of Information Display System 1] Next, the information display system 1 according to an embodiment will be described in detail.

[0019] [Non-volatile display device 100] The nonvolatile display device 100 is powered by the wireless tag 400 and rewrites the display based on a first signal transmitted from the wireless tag 400. The nonvolatile display device 100 may be, for example, electronic paper that uses various methods including an electrophoretic method, etc. By using, for example, electronic paper, the nonvolatile display device 100 consumes no power (or consumes relatively minimal power) during display on the display unit 101, and also makes it possible to relatively reduce power consumption when rewriting the display on the display unit 101. When nonvolatile display device 100 receives power from wireless tag 400, and receives a first signal for rewriting the display on display unit 101 transmitted from wireless tag 400, nonvolatile display device 100 rewrites the image, etc. displayed on display unit 101 based on the first signal. After that, even if the power supply is stopped, nonvolatile display device 100 maintains the image, etc. displayed on display unit 101 and continues the display. The nonvolatile display device 100 may receive power wirelessly from the wireless tag 400, for example, or may receive power from the wireless tag 400 via a wired connection.

[0020] [Reader device 200] The reader device 200 wirelessly supplies power to the wireless tag 400 and transmits a second signal to the wireless tag 400 .

[0021] The second signal may include, for example, when the wireless tag 400 stores measurement information transmitted from the external measuring device 300, information instructing the wireless tag 400 to transmit a first signal based on the measurement information to the non-volatile display device 100.

[0022] Alternatively, the second signal may include information instructing the external measuring device 300 to measure and calculate a predetermined physical quantity via the wireless tag 400 and to transmit the calculation result (fourth signal) to the wireless tag 400. Alternatively, the second signal may include information instructing the external measuring device 300 to transmit the measurement and calculation result (fourth signal) of the predetermined physical quantity stored in the storage unit 312 (see FIG. 3 ) described later to the wireless tag 400 via the wireless tag 400. The fourth signal will be described later. In this case, the second signal may include information instructing the wireless tag 400 to transmit the first signal corresponding to the calculation result (fourth signal) to the non-volatile display device 100 when the calculation result (fourth signal) is obtained from the external measuring device 300. In other words, the reader device 200 may transmit to the wireless tag 400 a second signal including information instructing the external measuring device 300 to perform a measurement calculation and information instructing the non-volatile display device 100 to rewrite the display based on the measurement information transmitted from the external measuring device 300.

[0023] The reader device 200 may be configured to output a high-frequency electromagnetic wave as wireless power supply, for example. In this case, the wireless tag 400 may be configured to receive the high-frequency wave and obtain power by induced electromotive force, for example. The reader device 200 may, for example, include the second signal in a high-frequency electromagnetic wave for wireless power supply and transmit it to the wireless tag 400, or may transmit the high-frequency electromagnetic wave and the second signal separately to the wireless tag 400.

[0024] [Radio tag 400] FIG. 2 is a block diagram for explaining the wireless tag 400 according to an embodiment.

[0025] The wireless tag 400 may have a function as a signal hub, that is, a function of receiving a signal transmitted from one device and transmitting the signal to another device. The wireless tag 400 may be, for example, a passive type.

[0026] Such a wireless tag 400 includes a communication unit 402 , a storage unit 403 and a control unit 401 .

[0027] The communication unit 402 communicates with devices external to the wireless tag 400. That is, the communication unit 402 transmits and receives information (signals) with the reader device 200, the external measuring device 300, and the nonvolatile display device 100. The communication unit 402 may include a coil (not shown) so that wireless power supply from the reader device 200 is possible.

[0028] The storage unit 403 stores, for example, various information and programs. The storage unit 403 may store, for example, measurement information transmitted from the external measurement device 300. The storage unit 403 may store, for example, instructions (information) transmitted from the reader device 200.

[0029] The control unit 401 controls the entire wireless tag 400, including the communication unit 402 and the storage unit 403. The control unit 401 may be configured, for example, by an arithmetic processing device.

[0030] The wireless tag 400 as described above transmits power wirelessly supplied from the reader device 200 to the nonvolatile display device 100. As described above, as an example, the wireless tag 400 may be configured to receive high frequency waves from the reader device 200 and obtain power by induced electromotive force. The wireless tag 400 supplies the power to the nonvolatile display device 100. When the wireless tag 400 is wirelessly powered from the reader device 200, it can supply power to the nonvolatile display device 100 based on the power wirelessly supplied from the reader device 200 using various methods using wireless or wired communication. As an example, when the wireless tag 400 wirelessly supplies power to the nonvolatile display device 100, it may wirelessly supply power to the nonvolatile display device 100 using high frequency electromagnetic waves. Note that as an example, when the wireless tag 400 transmits a first signal to the nonvolatile display device 100, the wireless tag 400 may transmit the first signal as a high frequency signal to supply power (wirelessly) to the nonvolatile display device 100 by the high frequency of the first signal.

[0031] The wireless tag 400 acquires measurement information (fourth signal) related to the measurement performed by the external measuring device 300 based on the second signal transmitted from the reader device 200, and transmits a first signal including the measurement information to the nonvolatile display device 100. That is, the control unit 401 controls the communication unit 402 to transmit the first signal to the nonvolatile display device 100.

[0032] For example, when a predetermined physical quantity is measured (calculated) in the external measuring device 300, the wireless tag 400 may receive measurement information (fourth signal) based on the measurement (calculation) from the external storage device in advance. For example, the wireless tag 400 is wirelessly powered from the external measuring device 300, and can store the measurement information in the storage unit 403 under the control of the control unit 401. For example, when the wireless tag 400 receives a second signal transmitted from the reader device 200, the wireless tag 400 may transmit a first signal including the measurement information to be stored in the storage unit 403 to the non-volatile display device 100.

[0033] Alternatively, as an example, the wireless tag 400 may transmit a third signal to the external measuring device 300 based on the second signal. The wireless tag 400 may transmit, as the third signal, a signal including information on instructions to the external measuring device 300, such as measurement of a predetermined physical quantity, a predetermined calculation based on the measurement, and transmission of the result of the calculation (creation of characters and images (display information) to be displayed on the nonvolatile display device 100 based on the calculation result). That is, when the wireless tag 400 receives the second signal transmitted from the reader device 200, it transmits a third signal corresponding to the second signal to the external measuring device 300.

[0034] In this case, the wireless tag 400 may transmit, for example, the second signal as it is to the external measuring device 300. That is, in this embodiment, the "second signal" is rephrased as the "third signal," but the second signal transmitted from the reader device 200 may be transmitted as it is to the external measuring device 300 (for convenience, the "second signal" may be rephrased as the "third signal"). Alternatively, the wireless tag 400 may perform processing such as adding or deleting predetermined information on the second signal transmitted from the reader device 200, and then transmit the resulting signal to the reader device 200 as a third signal.

[0035] The wireless tag 400 may acquire measurement information (fourth signal) transmitted from the external measuring device 300 in response to the third signal. When the wireless tag 400 receives the measurement information (fourth signal) transmitted from the external measuring device 300, the wireless tag 400 transmits a first signal corresponding to the measurement information (fourth signal) to the nonvolatile display device 100.

[0036] In this case, the wireless tag 400 may transmit, for example, the fourth signal as it is to the nonvolatile display device 100. That is, in this embodiment, the "fourth signal" is rephrased as the "first signal," but the fourth signal transmitted from the external measuring device 300 may be transmitted as it is to the nonvolatile display device 100 (for convenience, the "fourth signal" may be rephrased as the "first signal").

[0037] Alternatively, the wireless tag 400 may perform processing such as adding or deleting predetermined information on the fourth signal transmitted from the external measuring device 300, and then transmit the fourth signal as a first signal to the nonvolatile display device 100. In this case, the wireless tag 400 may add information instructing the nonvolatile display device 100 to rewrite the display on the fourth signal (a signal including information on the calculation result in the external measuring device 300), and transmit the fourth signal as a first signal to the nonvolatile display device 100.

[0038] That is, the first signal may include, for example, information indicating the result of a measurement calculation performed in the external measurement device 300 and information instructing the non-volatile display device 100 to rewrite the display content in accordance with the result of the measurement calculation.

[0039] For example, when the wireless tag 400 transmits a high-frequency electromagnetic wave to the nonvolatile display device 100 as in the above-mentioned example, the wireless tag 400 may include the first signal in the electromagnetic wave. Alternatively, the wireless tag 400 may transmit the first signal to the nonvolatile display device 100 as a high-frequency signal (electromagnetic wave). This enables the nonvolatile display device 100 to wirelessly supply power based on the first signal.

[0040] [External measuring device 300] FIG. 3 is a block diagram for explaining an external measurement device 300 according to an embodiment.

[0041] The external measuring device 300 includes a communication unit 311, a storage unit 312, a measuring unit 313, a measurement control unit 302, a calculation unit 303, and a communication control unit 304. The measuring unit 313 and the measurement control unit 302 function as a weight measuring unit 320. The measurement control unit 302, the calculation unit 303, and the communication control unit 304 may be realized as one function of a control unit 301 (e.g., an arithmetic processing device, etc.) of the external measuring device 300. The external measuring device 300 includes a power supply 330, and is capable of performing various operations (processing) using the power supply 330. The power supply 330 may be, for example, a primary battery, a secondary battery, a commercial power supply, or the like.

[0042] The communication unit 311 communicates with the wireless tag 400 under the control of the communication control unit 304. The communication unit 311 receives, for example, a third signal from the wireless tag 400. In addition, the communication unit 311 transmits, for example, a fourth signal to the wireless tag 400.

[0043] The storage unit 312 stores, for example, various information, programs, etc. The storage unit 312 may store, for example, the results of weight measurement by the weight measurement unit 320. The storage unit 312 may store, for example, the results of calculation by the calculation unit 303. The storage unit 312 may store, for example, reference weight information used for calculation in the calculation unit 303.

[0044] The weight measuring unit 320 measures the weight of a measurement object placed in a predetermined area. Examples of the predetermined area may be various areas including a shelf and a space capable of containing a fluid. The measurement object may be various objects such as inventory goods and ingredients provided in a restaurant or the like, goods sold in various stores including a restaurant, fixtures such as tableware used in a restaurant, and various fluids used in a store.

[0045] Such a weight measuring unit 320 includes a measuring unit 313 and a measurement control unit 302 . The measuring unit 313 is disposed in a predetermined area and measures the weight of a measurement object. The measuring unit 313 may include, for example, a weight measuring sensor. The measurement control unit 302 controls the measuring unit 313. The measurement control unit 302 may control the measuring unit 313 to perform weight measurement at a predetermined timing, for example. Examples of the predetermined timing may include various timings such as the timing when the external measuring device 300 receives a third signal, a preset timing, and timing at every predetermined time. The measurement control unit 302 may store the results of the weight measurement in the storage unit 312.

[0046] The calculation unit 303 performs a predetermined calculation based on the weight measured by the weight measuring unit 320, and obtains a numerical value related to the measurement object as a calculation result. That is, the calculation unit 303 performs a predetermined calculation, for example, when the weight is measured by the weight measuring unit 320. For example, as the predetermined calculation, the calculation unit 303 may perform a calculation to calculate the number of measurement objects arranged in a predetermined area, or may perform a calculation to obtain the amount of change in the measurement object. The calculation unit 303 can acquire the quantity of the measurement objects based on, for example, the reference weight information stored in the storage unit 312 and the weight measured by the weight measurement unit 320. In this case, the reference weight information may be information on the weight per reference quantity (for example, one piece) of the measurement objects. Alternatively, the calculation unit 303 can acquire the amount of change in the weight of the measurement object before and after in time, based on, for example, the reference weight information stored in the storage unit 312 and the weight measured by the weight measurement unit 320. In this case, the reference weight information may be, for example, the weight of the measurement object before in time (for example, before the weight changes). Alternatively, for example, when weight measurement is performed at predetermined time intervals by weight measurement unit 320, calculation unit 303 may calculate the amount of change in the measurement object based on the weight measured by weight measurement unit 320 at the latest timing (T) and the weight (measurement result) stored in storage unit 312 based on measurements by weight measurement unit 320 at past timings (T-1, T-2, or T-3, ...). In this case, calculation unit 303 may calculate the amount of change in the quantity of the measurement object based on information on the weight per reference quantity of the measurement object (reference weight information) as described above, for example. The calculation unit 303 may, for example, store the calculation results in a storage unit.

[0047] The communication control unit 304 can transmit, for example, the calculation result by the calculation unit 303 to the wireless tag 400 as measurement information (fourth signal) at a predetermined timing. The communication control unit 304 may transmit the measurement information (fourth signal) to the wireless tag 400, for example, at a preset timing or at predetermined time intervals. Here, as an example, when weight measurement is performed by the weight measurement unit 320 at a predetermined timing and then calculation is performed by the calculation unit 303, the communication control unit 304 may transmit the result of the calculation as measurement information to the wireless tag 400 at a predetermined timing. Alternatively, as an example, when weight measurement is performed by weight measurement unit 320 at a predetermined timing, and then calculation is performed by calculation unit 303, and the result of the calculation is stored in memory unit 312, the communication control unit 304 may transmit the calculation result stored in memory unit 312 to the wireless tag 400 at a predetermined timing as measurement information.

[0048] Alternatively, when the communication control unit 304 receives the third signal from the wireless tag 400, for example, the communication control unit 304 may transmit the measurement information (fourth signal) to the wireless tag 400. When the communication control unit 304 receives the third signal transmitted by the wireless tag 400 via the communication unit 311, it controls the communication unit 311 to obtain a numerical value related to the object to be measured calculated by the calculation unit 303 based on the third signal, and to include the obtained result in measurement information (fourth signal) and transmit it to the wireless tag 400. That is, as an example, when communication control unit 304 receives the third signal transmitted from wireless tag 400 by communication unit 311, it instructs weight measurement unit 320 to perform weight measurement and instructs calculation unit 303 to perform calculation based on the result of the weight measurement. In this case, communication control unit 304 acquires the result of the calculation by calculation unit 303, for example. Alternatively, as an example, when the communication control unit 304 receives the third signal transmitted from the wireless tag 400 by the communication unit 311, the communication control unit 304 may acquire the calculation result of the calculation unit 303 stored in the storage unit 312. In this case, for example, when a calculation is performed by the calculation unit 303 based on weight measurement performed by the weight measurement unit 320 at predetermined time intervals and the result of the calculation is stored in the storage unit 312, the communication control unit 304 may acquire the most recent calculation result from the storage unit 312.

[0049] The communication control unit 304 controls the communication unit 311 to, for example, include the acquired calculation result as measurement information in a fourth signal and transmit the fourth signal to the wireless tag 400. Note that the communication control unit 304 may also control the communication unit 311 to transmit the measurement information (the fourth signal) to the wireless tag 400 as information (display information) in a form that allows characters, symbols, images, etc. based on the measurement information to be displayed on the non-volatile display device 100.

[0050] [Specific example of external measurement device 300] Next, a specific example of the external measuring device 300 described above will be described.

[0051] [First concrete example] FIG. 4 is a diagram for explaining a first specific example of the external measuring device 300. As shown in FIG.

[0052] As a first specific example, the external measuring device 300 may measure the weight of food and drink 500 placed on a shelf 510. The food and drink 500 may be, for example, an inventory of goods and ingredients provided at a restaurant or the like, and goods and other articles sold at various stores including restaurants. The shelf 510 refers to a place where the above-mentioned food and drink 500 (articles) are placed, and is not limited to a "shelf" itself. That is, the "shelf" in this case refers to an example of any area.

[0053] Weight measurement unit 320 may measure the weight of the stock of food and drink 500 placed on shelf 510 as the measurement object placed in a predetermined area. Measurement unit 313 constituting weight measurement unit 320 is installed, for example, on the underside of shelf 510 (horizontally extending board 511) and measures the weight of food and drink 500 placed on shelf 510.

[0054] The calculation section 303 may calculate the quantity of the food or drink 500 as a numerical value related to the measurement object, based on the weight measured by the weight measurement section 320 and a preset reference weight (reference weight information) of the food or drink 500. The reference weight information may be set for each food or drink 500. That is, the reference weight information may be information regarding the weight of a reference quantity (for example, one piece) of food or drink 500 according to the type of food or drink 500. Calculation unit 303 calculates the quantity of food and drink 500 stored on shelf 510 (on each plate 511) based on such reference weight information.

[0055] The communication control unit 304 may control the communication unit 311 to include the quantity of food and drink 500 calculated by the calculation unit 303 in the measurement information and transmit the same. That is, the communication control unit 304 may, for example, include the quantity of food and drink 500 calculated by the calculation unit 303 in the measurement information (fourth signal) and transmit the fourth signal to the wireless tag 400.

[0056] When nonvolatile display device 100 acquires the first signal corresponding to the fourth signal via wireless tag 400, it displays the quantity of food and beverage 500 on display unit 101. This enables an employee of the restaurant to check, for example, the number of food and beverage 500 in stock.

[0057] [Second concrete example] As a second specific example, the external measuring device 300 may measure the weight of fixtures arranged on a shelf. The fixtures may be, for example, tableware used in a restaurant. The shelf refers to a place where the above-mentioned fixtures (tableware) are placed (stored), and is not limited to a "shelf" itself. That is, the "shelf" in this case refers to an example of any area.

[0058] In this case, the weight measuring unit 320 may measure the weight of the inventory of fixtures used in the restaurant as the measurement target arranged in the predetermined area. For example, when a predetermined area is set for each type of fixture, the measuring unit 313 may be arranged for each of a plurality of predetermined areas (for each board that constitutes a shelf and is hung horizontally). The predetermined area may be, for example, an area for storing fixtures before use. In other words, the predetermined area may be, for example, an area for storing tableware before serving to customers.

[0059] The calculation unit 303 may calculate the quantity of fixtures based on the weight measured by the weight measurement unit 320 and a preset reference weight (reference weight information) of the fixtures, and may generate warning information regarding a quantity warning when the quantity of fixtures falls below a preset threshold quantity. The reference weight information may be set for each type of fixture, for example. That is, the reference weight information may be information on the weight per reference quantity (for example, one piece) of fixture according to the type of fixture. The threshold value is for notifying (warning) that the number of fixtures stored in a predetermined area is decreasing, for example. The threshold value may be set for each predetermined area (for each type of fixture), for example. The calculation unit 303 calculates the quantity of fixtures (tableware) stored in each specified area based on such reference weight information. Furthermore, the calculation unit 303 may calculate (determine) whether the quantity of fixtures will be equal to or less than a threshold based on the quantity of fixtures and a threshold. The calculation unit 303 may perform a calculation (determination) based on the threshold for each specified area. When the calculation unit 303 calculates (determines) that the quantity of fixtures will be equal to or less than the threshold, it generates warning information. The warning information may be, for example, information for warning that the quantity of fixtures stored in a specified area is low (below the threshold).

[0060] The communication control unit 304 may control the communication unit 311 to include the quantity of fixtures as a numerical value related to the measurement object and warning information in the measurement information and transmit the same. That is, the communication control unit 304 may, for example, include the quantity of fixtures calculated by the calculation unit 303 in the measurement information (fourth signal) and transmit the fourth signal to the wireless tag 400. Alternatively, when warning information is generated by the calculation unit 303, the communication control unit 304 may, for example, include the quantity of fixtures and warning information in the measurement information (fourth signal) and transmit the fourth signal to the wireless tag 400.

[0061] When the nonvolatile display device 100 acquires the first signal corresponding to the fourth signal via the wireless tag 400, it displays the number of fixtures and warning information (that the number of fixtures is low) on the display unit 101. This enables the restaurant staff to, for example, clean the fixtures and replenish them in a specified area.

[0062] [Third Specific Example] FIG. 5 is a diagram for explaining a third specific example of the external measuring device 300. As shown in FIG.

[0063] As a third specific example, the external measuring device 300 may be a kitchen appliance 600 used in a kitchen of a restaurant, and may measure the weight of an object placed in the space of the kitchen appliance 600. In this case, the external measuring device 300 may estimate the state of the kitchen appliance 600 according to the weight measurement result.

[0064] That is, the external measurement device 300 may be equipped with a kitchen apparatus 600 having at least two spaces, a first space 601 and a second space 602, with the first space 601 and the second space 602 being connected via a flow path 603. The kitchen apparatus 600 may be, for example, an apparatus used for cooking, such as a rice-washing cooker. An example of a rice-washing cooker includes a rice storage tank (first space 601) and a rice-washing tank (second space 602). The rice-washing cooker, for example, supplies rice stored in the rice storage tank to the rice-washing tank, and washes the rice using water in the rice-washing tank.

[0065] The kitchen apparatus 600 is not limited to a rice washing cooker, and may be a kitchen apparatus having various flow paths. The fluid 610 may be, for example, a liquid, a granular solid, a powder, or a mixture thereof. The liquid may be, for example, water, oil, cooking water, a liquid containing a food to be cooked, or a cleaning liquid. The granular solid may be, for example, white rice, currant, wheat, or other grains. The powder may be, for example, a grain powder (such as flour), or a seasoning such as salt or sugar.

[0066] A predetermined amount or any amount of the fluid 610 may be supplied to the first space 601. When a predetermined amount of the fluid 610 is supplied to the first space 601, the weight of the fluid 610 in the first space 601 may be, for example, a weight that can be known in advance, that is, a weight that can be set in the external measuring device 300 as reference weight information.

[0067] The fluid 610 in the first space 601 is supplied to the second space 602 via the flow path 603. In this case, for example, an opening / closing valve (not shown) may be provided in the flow path 603. The opening / closing valve can supply a predetermined amount of the fluid 610 from the first space 601 to the second space 602 by being in an "open" state. In this case, the above-mentioned predetermined amount may be an amount (weight) that can be known in advance, that is, a weight that can be set in the external measuring device 300 as reference weight information.

[0068] The weight measuring unit 320 may measure the weight of a measurement object placed in the second space 602 as the predetermined area. That is, the weight measuring unit 320 measures the weight of the fluid 610 supplied to the second space 602.

[0069] The calculation unit 303 may calculate the amount of change in weight based on the weight corresponding to the measurement object inserted into the first space 601 and the weight of the measurement object placed in the second space 602 measured by the weight measurement unit 320 when the measurement object inserted into the first space 601 moves to the second space 602 via the flow path 603, and may obtain an inferred result that there is leakage of the measurement object if the amount of change indicates a decrease.

[0070] The weight corresponding to the measurement object inserted into the first space 601 may be, for example, the weight of a predetermined amount of fluid 610 when a predetermined amount of fluid 610 is supplied to the first space 601. Alternatively, the weight corresponding to the measurement object inserted into the first space 601 may be, for example, the weight of a predetermined amount of fluid 610 based on adjustment by an open / close valve when a predetermined amount of fluid 610 is supplied from the first space 601 to the second space 602 by control of an open / close valve disposed in the flow path 603. That is, the weight corresponding to the measurement object inserted into the first space 601 may be a reference weight recorded in the reference weight information.

[0071] The calculation unit 303 calculates the amount of change in the weight of the fluid 610 based on the reference weight information and the weight of the fluid 610 in the second space 602 measured by the weight measurement unit 320. Here, for example, if there is leakage of the fluid 610 in the second space 602 or the like, the weight of the fluid 610 in the second space 602 is less than the weight of the predetermined amount of the fluid 610 described above. For example, the calculation unit 303 may estimate that there is leakage of the fluid 610 in the second space 602 or the like when the weight of the fluid 610 in the second space 602 has decreased based on the weight of the predetermined amount of the fluid 610 recorded in the reference weight information. Similarly, the calculation unit 303 may estimate that there is no leakage of the fluid 610 in the second space 602 or the like when the weight of the fluid 610 in the second space 602 does not decrease based on the weight of the predetermined amount of the fluid 610 recorded in the reference weight information.

[0072] The communication control unit 304 may control the communication unit 311 to include at least one of the amount of change in weight and the estimation result in the measurement information and transmit the information. That is, the communication control unit 304 may, for example, include the amount of change in weight calculated by the calculation unit 303 in the measurement information (fourth signal) and transmit the fourth signal to the wireless tag 400. Alternatively, the communication control unit 304 may, for example, include the amount of change in weight calculated by the calculation unit 303 and the estimation result that there is leakage in the fluid 610 (or there is no leakage) in the measurement information (fourth signal) and transmit the fourth signal to the wireless tag 400. Alternatively, the communication control unit 304 may, for example, include the estimation result by the calculation unit 303 regarding the presence or absence of leakage of the fluid 610 in the measurement information (fourth signal) and transmit the fourth signal to the wireless tag 400.

[0073] When the nonvolatile display device 100 acquires the first signal corresponding to the fourth signal via the wireless tag 400, it displays at least one of the amount of change in weight of the fluid 610 and the estimation result on the display unit 101. This allows an employee of the restaurant to know, for example, whether or not there is a malfunction in the kitchen device 600.

[0074] [Information display method] Next, an information display method according to an embodiment will be described. First, the first information display method will be described. FIG. 6 is a first timing chart for explaining an information display method according to an embodiment.

[0075] In step ST101, the reader device 200 instructs the nonvolatile display device 100 to display the results of the measurement and calculation performed by the external measuring device 300.

[0076] In step ST102, the reader device 200 wirelessly supplies power to the wireless tag 400 in response to step ST101.

[0077] In step ST103, in response to step ST101, the reader device 200 transmits a second signal to the wireless tag 400. The second signal may include, for example, at least information instructing the nonvolatile display device 100 to transmit a first signal based on measurement information, which will be described later.

[0078] In step ST104, the wireless tag 400 instructs the external measuring device 300 to transmit the results of the measurement performed by the external measuring device 300 and the results of the calculation based on the measurement, in response to the second signal transmitted in step ST103.

[0079] In step ST105, in response to step ST104, the wireless tag 400 transmits a third signal to the external measuring device 300. The third signal may include, for example, information instructing the external measuring device 300 to transmit the result of measurement in the external measuring device 300 and the result of a calculation based on the measurement.

[0080] In step ST106, the external measuring device 300 acquires the results of measurement and calculation regarding a predetermined physical quantity (for example, weight, etc.), that is, a numerical value regarding the measurement object, based on the third signal transmitted in step ST105.

[0081] In step ST107, the external measuring device 300 transmits to the wireless tag 400 the measurement information (fourth signal) including the results of the measurement and calculation (values ​​related to the measurement object) acquired in step ST106.

[0082] In step ST108, the wireless tag 400 supplies power to the nonvolatile display device 100 in response to the wireless power supply in step ST102.

[0083] In step ST109, when the wireless tag 400 acquires the measurement information (fourth signal) in response to step ST107, the wireless tag 400 transmits to the nonvolatile display device 100 a first signal including the measurement information.

[0084] In step ST110, the nonvolatile display device 100 rewrites the display based on the power supply from the wireless tag 400 in step ST108 and the first signal transmitted in step ST109. That is, the nonvolatile display device 100 performs display based on the measurement information.

[0085] Next, the second information display method will be described. FIG. 7 is a second timing chart illustrating the information display method according to an embodiment.

[0086] In step ST201, the external measuring device 300 measures a predetermined physical quantity (e.g., weight, etc.) at a predetermined timing and performs a calculation based on the measurement result. That is, the external measuring device 300 acquires a numerical value related to the measurement target. The predetermined timing may be, for example, every predetermined time, or a preset timing, etc.

[0087] In step ST202, the external measuring device 300 wirelessly supplies power (or supplies power via a wire) to the wireless tag 400 in response to the measurement and calculation in step ST201.

[0088] In step ST203, the external measuring device 300 transmits measurement information to the wireless tag 400 in response to the measurement and calculation in step ST201.

[0089] In step ST204, the wireless tag 400 stores in the storage unit 403 the measurement information transmitted in step ST203.

[0090] In step ST205, the reader device 200 instructs the nonvolatile display device 100 to display the results of the measurement and calculation performed by the external measuring device 300.

[0091] In step ST206, the reader device 200 wirelessly supplies power to the wireless tag 400 in response to step ST205.

[0092] In step ST207, in response to step ST205, the reader device 200 transmits a second signal to the wireless tag 400. The second signal may include, for example, at least information instructing the nonvolatile display device 100 to transmit a first signal based on the measurement information.

[0093] In step ST208, the wireless tag 400 supplies power to the nonvolatile display device 100 in response to the wireless power supply in step ST206.

[0094] In step ST209, upon receiving the second signal in step ST207, the wireless tag 400 reads out the measurement information stored in the storage unit 403, and transmits a first signal including the measurement information to the nonvolatile display device 100.

[0095] In step ST210, the nonvolatile display device 100 rewrites the display based on the power supply from the wireless tag 400 in step ST208 and the first signal transmitted in step ST209. That is, the nonvolatile display device 100 performs display based on the measurement information.

[0096] Each of the above-mentioned units of the external measuring device 300 may be realized as a function of a processing unit of a computer, etc. That is, the measurement control unit 302 (weight measurement unit 320), the calculation unit 303, and the communication control unit 304 (control unit 301) of the external measuring device 300 may be realized as a measurement control function (weight measurement function), a calculation function, and a communication control function (control function) by the processing unit of a computer, etc. The external measurement program can cause a computer to realize each of the above-mentioned functions. The external measurement program may be recorded in a non-transitory computer-readable recording medium, such as an external memory or an optical disk. As described above, each unit of the external measuring device 300 may be realized by an arithmetic processing device of a computer, etc. The arithmetic processing device, etc., is composed of, for example, an integrated circuit, etc. Therefore, each unit of the external measuring device 300 may be realized as a circuit constituting the arithmetic processing device, etc. That is, the measurement control unit 302 (weight measurement unit 320), the calculation unit 303, and the communication control unit 304 (control unit 301) of the external measuring device 300 may be realized as a measurement control circuit (weight measurement circuit), a calculation circuit, and a communication control circuit (control circuit) constituting the arithmetic processing device, etc. of a computer. The communication unit 311, the storage unit 312, and the measurement unit 313 of the external measurement device 300 may be realized as a communication function, a storage function, and a measurement function including the functions of an arithmetic processing device, etc. The communication unit 311, the storage unit 312, and the measurement unit 313 of the external measurement device 300 may be realized as a communication circuit, a storage circuit, and a measurement circuit by being configured with, for example, an integrated circuit, etc. The communication unit 311, the storage unit 312, and the measurement unit 313 of the external measurement device 300 may be realized as a communication device, a storage device, and a measurement device by being configured with, for example, a plurality of devices.

[0097] [Aspects and Effects of the Present Embodiment] Next, an aspect of this embodiment and the effects of each aspect will be described.

[0098] (Aspect 1) One embodiment of an information display system includes a non-volatile display device that is powered by a wireless tag and rewrites a display based on a first signal transmitted from the wireless tag, a reader device that wirelessly supplies power to the wireless tag and transmits a second signal to the wireless tag, and a wireless tag that powers the non-volatile display device based on the power wirelessly supplied from the reader device, and acquires measurement information related to measurement performed by an external measuring device based on the second signal transmitted from the reader device, and transmits a first signal corresponding to the measurement information to the non-volatile display device. This allows the information display system to use the wireless tag to send and receive information (signals) between the non-volatile display device, the external measuring device, and the non-volatile display device. Also, the information display system can rewrite the content displayed on the non-volatile display device by using power supplied from the wireless tag. Thus, the information display system can display characters, symbols, images, etc. based on the measurement information output from the external measuring device on the non-volatile display device, achieving high display functionality with relatively low power consumption.

[0099] (Aspect 2) In one embodiment of the information display system, the reader device may transmit to the wireless tag a second signal including information instructing the wireless tag to perform measurement calculations on the external measuring device and information instructing the wireless tag to rewrite the display of the non-volatile display device based on the measurement information transmitted from the external measuring device. This allows the information display system to utilize the wireless tag as a signal hub, and to display the measurement results from the external measurement device on the non-volatile display device at a relatively low cost.

[0100] (Aspect 3) In one embodiment of the information display system, the wireless tag may transmit a third signal including information instructing the external measuring device to perform measurement calculations based on the second signal, and may also acquire measurement information transmitted from the external measuring device in response to the third signal. This allows the information display system to use the wireless tag as a signal hub and to obtain the measurement results of an external measurement device.

[0101] (Aspect 4) In one embodiment of the information display system, the external measuring device may include a communication unit that communicates with the wireless tag, a weight measurement unit that measures the weight of a measurement object placed in a specified area, a calculation unit that performs a specified calculation based on the weight measured by the weight measurement unit and obtains a numerical value related to the measurement object as a calculation result, and a communication control unit that controls the communication unit to obtain the numerical value related to the measurement object calculated by the calculation unit and include the result of the calculation in measurement information and transmit it to the wireless tag. This enables the information display system to obtain the weight-related measurement results from the external measuring device and display them on the non-volatile display device. In this aspect, when the communication control unit receives the third signal transmitted by the wireless tag via the communication unit, the communication control unit may control the communication unit to acquire a numerical value related to the object to be measured calculated by the calculation unit based on the third signal, and to include the acquired result in measurement information and transmit it to the wireless tag.

[0102] (Aspect 5) In one embodiment of the information display system, the weight measuring unit measures the weight of the inventory of food and beverages placed on a shelf as measurement objects arranged in a specified area, the calculation unit calculates the quantity of the food and beverages as numerical values ​​related to the measurement objects based on the weight measured by the weight measuring unit and a predetermined reference weight of the food and beverages, and the communication control unit controls the communication unit to include the quantity of the food and beverages calculated by the calculation unit in the measurement information and transmit it. This enables the information display system to, for example, manage food and drink inventory, and assist the work of restaurant employees.

[0103] (Aspect 6) In one embodiment of the information display system, a weight measurement unit measures the weight of the inventory of fixtures used in the restaurant as measurement objects arranged in a specified area, a calculation unit calculates the quantity of fixtures based on the weight measured by the weight measurement unit and a predetermined reference weight of the fixtures, and generates warning information regarding a quantity warning when the quantity of fixtures falls below a predetermined threshold quantity, and a communication control unit controls the communication unit to include the quantity of fixtures as a numerical value related to the measurement object and the warning information in the measurement information and send it. This allows the information display system to display a warning on the non-volatile display device that the number of fixtures arranged in a specified area is low, thereby assisting employees in their work at the restaurant.

[0104] (Aspect 7) In one embodiment of the information display system, the external measuring device is equipped with a kitchen apparatus having at least two spaces, a first space and a second space, the first space and the second space being connected via a flow path, the weight measuring unit measures the weight of a measuring object placed in the second space as a predetermined area, the calculation unit calculates an amount of change in weight based on a weight corresponding to the measuring object inserted into the first space and the weight of the measuring object placed in the second space measured by the weight measuring unit when the measuring object inserted into the first space moves to the second space via the flow path, and if the amount of change indicates a decrease, an estimation result is obtained that there is leakage of the measuring object, and the communication control unit may control the communication unit to include at least one of the amount of change in weight and the estimation result in the measurement information and transmit it. This allows the information display system to display on the non-volatile display device that there is a malfunction related to fluid leakage in the kitchen equipment, thereby assisting employees in their work at the restaurant.

[0105] (Aspect 8) An information display device of one embodiment includes a non-volatile display device that is powered by a wireless tag and rewrites a display based on a first signal transmitted from the wireless tag, and a wireless tag that powers the non-volatile display device based on power wirelessly supplied from an external device, acquires measurement information related to measurement performed by an external measurement device, and transmits a first signal corresponding to the measurement information to the non-volatile display device. This allows the information display device to use the wireless tag to send and receive information (signals) between the non-volatile display device and the external measurement device. Also, the information display device can rewrite the content displayed on the non-volatile display device by using power supplied from the wireless tag. Therefore, the information display device can display characters, symbols, images, etc. based on the measurement information output from the external measurement device on the non-volatile display device, and can achieve high display functionality with relatively low power consumption.

[0106] (Aspect 9) In one embodiment of the information display method, the method is performed in an information display system including a non-volatile display device, a reader device, and a wireless tag, and includes the steps of: the non-volatile display device being powered by the wireless tag and rewriting the display based on a first signal transmitted from the wireless tag; the reader device wirelessly powering the wireless tag and transmitting a second signal to the wireless tag; and the wireless tag powering the non-volatile display device based on the power wirelessly supplied from the reader device, acquiring measurement information related to measurement performed in an external measurement device based on the second signal transmitted from the reader device, and transmitting a first signal corresponding to the measurement information to the non-volatile display device. As a result, the information display method can achieve the same effects as the information display system of the above-described aspect.

[0107] [Variations] In the external measuring device of the above-mentioned embodiment, an example has been described in which the memory unit of the external measuring device stores reference weight information in advance, and the calculation unit calculates the amount of change in weight of the object to be measured based on the reference weight information and the weight measurement result by the weight measurement unit. As a modification of this embodiment, the external measuring device may calculate the amount of change in weight of the measurement object based on reference weight information input from outside. In this case, the external measuring device may obtain the reference weight information via the second signal and the third signal, for example, when the weight (reference weight information) of the measurement object from a previous time (for example, before the weight changes) is input to the reader device. Alternatively, the external measuring device may input the reference weight information based on the operation of an input device (not shown) of the external measuring device. [Explanation of symbols]

[0108] 1 Information display system 100 Non-volatile display device 200 Reader Device 300 External measuring device 301 Control Unit 302 Measurement control section 303 Arithmetic section 304 Communication Control Unit 311 Communications Department 312 Storage section 313 Measurement Division 320 Weight Measurement Department 330 Power supply 400 Radio Tags 401 Control section 402 Communications Department 403 Storage section

Claims

1. a non-volatile display device that is powered by a wireless tag and rewrites a display based on a first signal transmitted from the wireless tag; a reader device that wirelessly supplies power to the wireless tag and transmits a second signal to the wireless tag; the wireless tag supplies power to the non-volatile display device based on power wirelessly supplied from the reader device, and transmits a first signal corresponding to measurement information related to a measurement performed by an external measurement device to the non-volatile display device based on a second signal transmitted from the reader device; Equipped with The wireless tag acquires in advance measurement information transmitted from the external measurement device, and transmits a first signal corresponding to the previously acquired measurement information to the non-volatile display device based on a second signal transmitted from the reader device. Information display system.

2. The external measurement device acquires measurement information related to items used or provided in the restaurant or food and beverages sold in the store, The reader device transmits to the wireless tag a signal including information instructing the wireless tag to rewrite the display on the non-volatile display device with respect to measurement information related to items used or provided at the restaurant or food and drink sold at the store, which is transmitted in advance from the external measurement device to the wireless tag. The information display system according to claim 1 .

3. The wireless tag transmits a third signal including information instructing the external measurement device to perform measurement calculation of an item used or provided at the restaurant or food and drink sold at the store based on the second signal, and acquires measurement information of the item used or provided at the restaurant or food and drink sold at the store transmitted from the external measurement device in response to the third signal.

3. An information display system according to claim 1 or 2.

4. The external measurement device is A communication unit that communicates with the wireless tag; a weight measurement unit that measures the weight of items used or provided at restaurants located in a predetermined area or food and drink sold at a store; a calculation unit that performs a predetermined calculation based on the weight measured by the weight measurement unit and obtains a numerical value related to an item used or provided at a restaurant or food and drink sold at a store as a result of the calculation; a communication control unit that controls the communication unit to acquire values ​​calculated by the calculation unit regarding items used or provided at the restaurant or foods and drinks sold at the store, and to include the acquired results in measurement information and transmit the measurement information to the wireless tag; The information display system according to claim 3 .

5. The weight measurement unit measures the weight of an inventory of food and beverages arranged on a shelf as items used or provided in a restaurant arranged in a predetermined area or food and beverages sold in a store, The calculation unit calculates the quantity of food and beverages as a numerical value related to the items used or provided in the restaurant or the food and beverages sold in the store based on the weight measured by the weight measurement unit and a preset reference weight of the food and beverages, The communication control unit controls the communication unit to include the quantity of food and drink calculated by the calculation unit in measurement information and transmit the information. The information display system according to claim 4.

6. The weight measurement unit measures the weight of an inventory of fixtures used in a restaurant as items used or provided in the restaurant located in a predetermined area or food and beverages sold in the store, The calculation unit calculates the quantity of the fixtures based on the weight measured by the weight measurement unit and a preset reference weight of the fixtures, and generates warning information regarding a quantity warning when the quantity of the fixtures falls below a preset threshold quantity; The communication control unit controls the communication unit to transmit measurement information including a quantity of fixtures as a numerical value related to items used or provided in a restaurant or food and drink sold in a store, and warning information. The information display system according to claim 4.

7. The external measurement device is A kitchen device having at least two spaces, a first space and a second space, the first space and the second space being connected via a flow path; The weight measurement unit measures the weight of an item used or provided at a restaurant or food and drink sold at a store, the item being arranged in a second space as a predetermined area; the calculation unit calculates a change in weight based on a weight corresponding to an item used or provided at a restaurant or food and drink sold at a store that is inserted into the first space and a weight of the item or food and drink placed in the second space measured by the weight measurement unit when the item or food and drink inserted into the first space moves to the second space through the flow path, and obtains an inference that there is a leakage of the item or food and drink when the change in weight indicates a decrease; The communication control unit controls the communication unit to include at least one of the amount of change in weight and the estimation result in the measurement information and transmit the information. The information display system according to claim 4.

8. An information display method performed in an information display system including a non-volatile display device, a reader device, and a wireless tag, comprising: a step of acquiring in advance measurement information related to an item used or provided at a restaurant or food and drink sold at a store, the measurement information being measured by an external measurement device using the wireless tag; The reader device wirelessly supplies power to the wireless tag and transmits a second signal to the wireless tag; The wireless tag supplies power to the non-volatile display device based on power wirelessly supplied from the reader device, and transmits a first signal corresponding to the measurement information acquired in advance to the non-volatile display device based on a second signal transmitted from the reader device; the nonvolatile display device being powered by the wireless tag and rewriting a display based on a first signal transmitted from the wireless tag; A method of displaying information.

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