JP2012118613A - Information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely display information without wasting a battery part in an information display device in which the battery part is embedded and non-contact communication is possible.SOLUTION: The information display device comprises an antenna 31 for performing the non-contact communication; a display unit 37 that displays information by being powered on and that keeps displaying the information when power supply is stopped after that; and a CPU 35 that causes the display unit 37 to display information received through the antenna 31 by supplying power of a battery 34 to the display unit 37. The CPU 35 supplies the power of the battery 34 to the display unit 37 only when the information, which is received through the antenna 31, to be displayed on the display unit 37 is updated.

Description

  The present invention relates to an information display device capable of non-contact communication.

  In recent years, with the progress of the information-oriented society, information is recorded on a card, and information management and settlement using the card are performed. Cards used for such information management and settlement include IC cards with built-in IC chips and magnetic cards on which information is written by magnetism, and information is written and read using a dedicated device. Is called.

  Further, in the IC card, a contact type IC card that performs writing and reading of information by contacting a dedicated device, and a non-contact type IC that can perform writing and reading of information only by being brought close to the dedicated device. There is a card. These IC cards are higher in security than magnetic cards, have a large amount of writable information, and can use a single card for multiple purposes. Therefore, the popularity of the IC card is increasing. . Among them, in the non-contact type IC card, when writing or reading information, it is not necessary to take out the card and insert it into a dedicated device, so that it is convenient for handling. Devices for reading information are rapidly spreading.

  In recent years, an information display function added to such a non-contact type IC card has been considered, for example, disclosed in Patent Document 1. The IC card information display disclosed in Patent Document 1 has been supplied with electric power from the reader / writer by non-contact communication by being close to the reader / writer, and the display element is driven by this electric power and transmitted from the reader / writer. Information and information written in the memory can be displayed.

  However, when information is displayed by the power supplied from the reader / writer by non-contact communication, especially in the case of performing non-contact communication using a microwave band or UHF band (ultra-high frequency band) of several hundred megahertz or more. Since the power supplied from the reader / writer by non-contact communication is small, it is difficult to obtain the power necessary to display the information by driving the display element, making it difficult to display the information accurately. End up.

  Here, in a configuration in which an information display function is added to a non-contact type IC card, Patent Document 2 discloses a non-contact IC card with a display having a built-in battery unit. The non-contact IC card with a display disclosed in Patent Document 2 includes a power supply unit including an antenna and a battery unit for performing non-contact communication with a reader / writer, and an IC is provided from the power supply unit. Power is supplied to the card unit and the display unit. By incorporating the battery portion in this way, it is possible to obtain power necessary for displaying information.

JP 2004-21288 A JP 2001-5927 A

  However, as described above, in the case where power is supplied to the IC card unit or the display unit from the power supply unit including the antenna and the battery unit for performing contactless communication, only when information is displayed on the display unit. First, even when non-contact communication is performed with the reader / writer in the IC card unit, power is supplied from the battery unit to the IC card unit, so the weakness of non-contact communication with the reader / writer is weak. Even when only a small amount of electric power is required, the battery unit is consumed, and there is a problem in that the battery unit is wasted.

  The present invention has been made in view of the problems of the conventional technology as described above, and in an information display device that incorporates a battery unit and enables non-contact communication, the battery unit is wasted. An object of the present invention is to provide an information display device that can display information reliably.

In order to achieve the above object, the present invention provides:
A battery unit, an antenna for performing contactless communication, a display unit that displays information when power is supplied, and then continues to display the information when power supply is stopped; and In an information display device comprising a central control unit that displays information received via the antenna on the display unit by supplying power to the display unit,
The central control unit supplies power of the battery unit to the display unit only when information to be displayed on the display unit received via the antenna is updated.

  In the present invention configured as described above, contactless communication is performed between the reader / writer and the antenna when the reader / writer transmits information to be displayed on the display unit. At this time, the power of the battery unit is not supplied to the display unit. When the information to be displayed on the display unit is transmitted from the reader / writer and received by the antenna, and the received information is updated, the power of the battery unit is controlled by the control of the central control unit. Information supplied and received via the antenna is displayed on the display unit by the power. When the received information is not updated, the power of the battery unit is not supplied to the display unit under the control of the central control unit, and the displayed information is displayed as it is on the display unit.

  In this way, when the information to be displayed on the display unit received via the antenna is updated, the power of the battery unit is supplied to the display unit and the updated information is displayed. Otherwise, the battery unit Since the information displayed on the display unit is displayed as it is without being supplied to the display unit, when the information to be displayed on the display unit is updated, the information is displayed on the display unit. Even when sufficient power is supplied to the display unit and information is reliably displayed, the battery unit is not wasted.

  In addition, in the case of having a communication control unit having a memory for storing information to be displayed on the display unit received via the antenna, power due to non-contact communication via the antenna is unstable. Rather than transmitting the information received and stored in the memory to the central control unit, when the information received via the antenna is stored in the memory, a signal indicating that is transmitted from the communication control unit to the central control unit. When the central control unit receives the signal from the communication control unit, the central control unit checks whether the information stored in the memory is updated, and supplies the battery unit power to the display unit only when the information is updated. It is possible to do.

  In addition, if the central control unit is in a sleep state that only receives a signal from the communication control unit, and if the signal is received from the communication control unit, the central control unit can be switched from the sleep state to the active state. Until the unit confirms whether or not the information stored in the memory is updated, the sleep state is established, so that the consumption of the battery unit can be further reduced.

  As described above, in the present invention, when the information to be displayed on the display unit received via the antenna is updated, the power of the battery unit is supplied to the display unit, and the updated information is displayed. In this case, since the power of the battery unit is not supplied to the display unit, the information displayed on the display unit is displayed as it is, so when the information to be displayed on the display unit is updated, the information is displayed. Sufficient power for display on the display unit is supplied to the display unit, so that information can be displayed reliably without wasting the battery unit.

It is a figure which shows one Embodiment of the information display apparatus of this invention, (a) is a surface view, (b) is AA 'sectional drawing shown to (a), (c) is the base in a variable display part. It is a figure which shows the structure on a base material. It is a functional block diagram of the information display apparatus shown in FIG. It is a figure which shows the utilization form of the information display apparatus shown in FIG. 4 is a flowchart for explaining an operation when the information display device shown in FIG. 1 is used as shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1A and 1B are diagrams showing an embodiment of an information display device of the present invention, in which FIG. 1A is a front view, FIG. 1B is a cross-sectional view taken along line AA ′ shown in FIG. FIG. 3 is a diagram showing a configuration on a base substrate 11 in the display unit 2.

  In this embodiment, as shown in FIG. 1, an information display layer 12 is sandwiched between a base substrate 11 and a transparent conductive film substrate 15. On the surface of the base substrate 11 facing the information display layer 12, a plurality of display electrodes 21a to 21g, wirings 22a to 22g connected thereto, and conductors 24a and 24b are formed, and a communication control unit and The UHF chip 23 is mounted. A mask layer 16 is laminated on the surface of the transparent conductive film substrate 15 opposite to the information display layer 12, and a print layer 17 is formed on a part of the mask layer 16. The fixed display unit 3 is configured to display arbitrary information such as “after event” and “day”.

  The base substrate 11 is made of, for example, PET, and the display electrodes 21a to 21g and the wiring 22a are formed on the surface facing the information display layer 12 by screen printing using, for example, a conductive paste such as silver paste or carbon paste or conductive ink. To 22 g and conductor portions 24 a and 24 b are formed. The display electrodes 21a to 21g are formed on the base substrate 11 in a pattern according to displayed information. In the present embodiment, numbers are displayed using the display electrodes 21a to 21g, and a voltage is selectively applied to the display electrodes 21a to 21g to display numbers "0" to "9". Thus, the variable display unit 2 is configured. The wirings 22a to 22g are connected to the display electrodes 21a to 21g on the surface of the base substrate 11 where the display electrodes 21a to 21g are formed, and are drawn out of the variable display unit 2 from the other ends. Is connected to a driver (not shown) for selectively applying a voltage to the display electrodes 21a to 21g. A voltage is selectively applied to the display electrodes 21a to 21g via these wirings 22a to 22g. Each of the conductor portions 24a and 24b has an isosceles triangle shape, and is formed on the base substrate 11 so that the vertices of the isosceles triangle face each other through a gap. The UHF chip 23 is mounted so as to be connected.

  The transparent conductive film substrate 15 is configured by forming a transparent electrode (for example, ITO) 13 on one surface of a transparent substrate 14 made of glass, a transparent film, or the like, and the display electrodes 21a to 21g and the transparent electrode 13 are formed. The information display layer 12 is sandwiched between the display electrodes 21 a to 21 g and the transparent electrode 13.

  The information display layer 12 displays information according to the potential difference between the display electrodes 21a to 21g and the transparent electrode 13, and in the state of displaying information, the display electrodes 21a to 21g and the transparent electrode 13 are displayed. Even if there is no potential difference between the two, the currently displayed information is continuously displayed. For this reason, a predetermined voltage is applied to the transparent electrode 13 and a voltage is selectively applied to the display electrodes 21a to 21g, whereby numbers “0” to “9” are displayed on the variable display unit 2. Will be. Examples of the information display layer 12 include an electrophoretic type, an electronic powder type, and an electrochromic type, and a microcapsule type electrophoretic type is most preferable.

  Below, the function of the information display apparatus 1 comprised as mentioned above is demonstrated.

  FIG. 2 is a functional block diagram of the information display device 1 shown in FIG.

  As shown in FIG. 2, the information display device 1 shown in FIG. 1 includes an antenna 31 composed of two conductor portions 24a and 24b formed on a base substrate 11, and display electrodes 21a to 21g and the display electrodes. A display unit 37 includes a driver (not shown) for applying a voltage to 21a to 21g and the information display layer 12. In addition, the shape of the conductor parts 24a and 24b constituting the antenna 31 is not limited to the isosceles triangle as shown in FIG.

  The UHF chip 23 connected to the antenna 31 composed of the conductor portions 24 a and 24 b has a memory 33 and stores information received via the antenna 31 in the memory 33.

  A CPU 35 serving as a central control unit is connected to the UHF chip 23. The CPU 35 controls the display on the display unit 37 based on a built-in program and information received via the antenna 31, and is driven by the battery 34 which is a battery unit. Further, a booster circuit 36 is connected to the CPU 35, and the power of the battery 34 is boosted by the booster circuit 36 and supplied to the display unit 37.

  Below, operation | movement of the information display apparatus 1 comprised as mentioned above is demonstrated.

  FIG. 3 is a diagram showing a usage form of the information display device 1 shown in FIG. 1, and FIG. 4 explains an operation when the information display device 1 shown in FIG. 1 is used as shown in FIG. It is a flowchart for doing.

  The information display device 1 shown in FIG. 1 is used to display information transmitted from the reader / writer 4 by approaching the reader / writer 4 connected to the personal computer 5, for example, as shown in FIG. The

  When the reader / writer 4 comes close to the information display device 1, the antenna 31 of the information display device 1 resonates with the radio wave from the reader / writer 4 to generate an electromotive force in the antenna 31 and the UHF chip 23 is activated. An ID transmission request is transmitted (step S1). This ID transmission request is for the reader / writer 4 to recognize the information display device 1 and requests transmission of an ID given in advance to the UHF chip 23 of the information display device 1.

  When the ID transmission request transmitted from the reader / writer 4 is received by the UHF chip 23 (step S2), the ID assigned in advance in the UHF chip 23 is transmitted via the antenna 31 (step S3).

  When the ID transmitted from the UHF chip 23 is received by the reader / writer 4 (step S4), information to be displayed on the display unit 37 of the information display device 1 corresponding to this ID is transmitted from the personal computer 5 via the reader / writer 4. Is transmitted (step S5).

  Information to be displayed on the display unit 37 transmitted from the reader / writer 4 is received by the UHF chip 23 via the antenna 31 (step S6) and stored in the memory 33 in the UHF chip 23 (step S7).

  Then, in the UHF chip 23, a pulse signal indicating that the information to be displayed on the display unit 37 has been received from the reader / writer 4 is transmitted to the CPU 35 (step S8). In the storage area of the memory 33 in the UHF chip 23, an area for storing information to be displayed on the display unit 37 transmitted from the reader / writer 4 is provided, and information is stored in that area. Then, a pulse signal is transmitted from the UHF chip 23.

  When the pulse signal transmitted from the UHF chip 23 is received by the CPU 35 (step S9), the CPU 35 is activated (step S10). The CPU 35 is normally activated by the power of the battery 34, but is in a sleep state in which only the pulse signal transmitted from the UHF chip 23 is received, and receives the pulse signal transmitted from the UHF chip 23. It will be in a starting state by this. Thereby, consumption of the battery 34 can be reduced.

  When the CPU 35 is activated, the information stored in the memory 33 of the UHF chip 23 is read by the CPU 35 (step S11), and it is confirmed whether the information to be displayed on the display unit 37 has been updated (step S12). Here, since the electromotive force generated in the antenna 31 by the radio wave from the reader / writer 4 is unstable, it is not preferable to transmit the information stored in the memory 33 of the UHF chip 23 to the CPU 35 using the power. . Therefore, as described above, the information received from the reader / writer 4 via the antenna 31 and stored in the memory 33 should not be transmitted to the CPU 35, but first displayed on the display unit 37 transmitted from the reader / writer 4. When the information is stored in the memory 33, a signal indicating that is transmitted from the UHF chip 23 to the CPU 35, and then the CPU 35 confirms whether the information stored in the memory 33 has been read and updated. Will be.

  The UHF chip 23 transmits a pulse signal when information to be displayed on the display unit 37 transmitted from the reader / writer 4 is stored in the memory 33, but when the information to be displayed on the display unit 37 does not change, that is, When the information to be displayed on the display unit 37 transmitted from the reader / writer 4 is the same, as described above, after the information is displayed, the display electrode 21a is not supplied with power after the information is displayed. Even if a potential difference does not occur between ˜21 g and the transparent electrode 13, since the currently displayed information is continuously displayed, the CPU 35 does not need to control the display of the display unit 37.

  Therefore, the CPU 35 normally does not supply the power of the battery 34 to the display unit 37, and supplies the power of the battery 34 to the display unit 37 only when information to be displayed on the display unit 37 is updated. To do.

  When the information to be displayed on the display unit 37 is updated, first, the booster circuit 36 is activated under the control of the CPU 35 (step S13), and the power of the battery 34 is boosted to correspond to the information read from the memory 33. Is supplied to the display unit 37. Then, according to the clock signal transmitted from the CPU 35 to the display unit 37, a predetermined voltage is applied to the display electrodes 21 a to 21 g and the transparent electrode 13 by using the power supplied via the booster circuit 36 in the driver in the display unit 37. By being applied, a potential difference is generated between the display electrodes 21a to 21g and the transparent electrode 13 (step S14), and information transmitted from the reader / writer 4 is displayed on the display unit 37 (step S15). ). Thereby, when information is not displayed on the display part 37, information is newly displayed, and when information is displayed on the display part 37, the displayed information is updated.

  After the CPU 35 newly displays information on the display unit 37 or updates the information displayed on the display unit 37 as described above, the CPU 35 returns to the sleep state again (step S16). The sleep state remains until the above-described pulse signal is received from the UHF chip 23.

  Thus, in this embodiment, when information to be displayed on the display unit 37 received via the antenna 31 is updated, the power of the battery 34 is supplied to the display unit 37 and the updated information is displayed. In other cases, since the power of the battery 34 is not supplied to the display unit 37 and the information displayed on the display unit 37 is displayed as it is, the information to be displayed on the display unit 37 is updated. The battery 34 is not wasted while the power is supplied to the display unit 37 and the information is reliably displayed to display the information on the display unit 37.

  In this embodiment, the UHF band antenna 31 is described as an example of the antenna. However, the antenna used in the present invention may be any non-contact communication antenna. In particular, in a device that performs non-contact communication using a microwave band or UHF band (ultra-high frequency band) of several hundred megahertz or more, the power supplied from the reader / writer by non-contact communication is small. In order to display information, it is difficult to obtain sufficient power by itself, and another power source is required. Therefore, in the case of having the antenna as described above, the built-in battery 34 plays a major role of displaying information on the display unit 37. By adopting a configuration in which power is not used other than displaying information on the display unit 37, a significant effect that is not possible in the past can be obtained.

DESCRIPTION OF SYMBOLS 1 Information display apparatus 2 Variable display part 3 Fixed display part 4 Reader / writer 5 Personal computer 11 Base base material 12 Information display layer 13 Transparent electrode 14 Transparent substrate 15 Transparent conductive film substrate 16 Mask layer 17 Print layer 21a-21g Display electrode 22a-22g Wiring 23 UHF chips 24a, 24b Conductor 31 Antenna 33 Memory 34 Battery 35 CPU
36 Booster 37 Display

Claims (3)

A battery unit, an antenna for performing contactless communication, a display unit that displays information when power is supplied, and then continues to display the information when power supply is stopped; and In an information display device comprising a central control unit that displays information received via the antenna on the display unit by supplying power to the display unit,
The central control unit supplies the power of the battery unit to the display unit only when information to be displayed on the display unit received via the antenna is updated. The information display device according to claim 1,
A memory for storing information to be displayed on the display unit received via the antenna is provided, and when the information received via the antenna is stored in the memory, a signal indicating that is sent to the central control unit Having a communication control unit to transmit,
When the central control unit receives the signal from the communication control unit, the central control unit checks whether the information stored in the memory is updated, and only when the information is updated, the power of the battery unit is An information display device supplied to the display unit. The information display device according to claim 2,
The central control unit is an information display device that is in a sleep state in which only the signal is received from the communication control unit, and is activated from the sleep state when the signal is received from the communication control unit.

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