JP2020126572A - Display driving device and wearable terminal device - Google Patents

Abstract

To provide a display driving device that does not increase cost and money in manufacturing components to be used even if the number of indicators is increased.CONSTITUTION: A display driving device includes: a rectification circuit 13 for converting a high-frequency signal into DC voltage; a radio communication circuit/control circuit 12 for demodulating the high-frequency signal; a first charging circuit for charging the DC voltage converted by the rectification circuit 13 and supplying a power supply to the radio communication circuit/control circuit 12; a first switch element conducted by the control circuit; a second charging circuit for charging the DC voltage converted by the rectification circuit after being connected to the rectification circuit by the conduction of the first switch element; and a second switch element for connecting between the second charging circuit and an indicator.SELECTED DRAWING: Figure 2

Description

The present invention relates to a display drive device and a wearable terminal device, and more particularly to a display drive device and a wearable terminal device to which a wireless tag is applied.

The wireless tag is also called an RFID tag, an IC tag, or a non-contact IC chip, and is a tool of an authentication technology that stores product information and the like in a memory inside the IC chip and reads it out wirelessly. Conventionally, the following prior art documents are known as an authentication technique using a wireless tag.

Patent Document 1 discloses an intelligent picking cart that does not need to be equipped with an information terminal. As shown in FIG. 1, this picking cart stores a plurality of cart storage units 2 for temporarily storing picked objects picked from a picking shelf 4 and a worker 8 for storing picked picked objects. A cart lamp indicator system for visually recognizing a cart storage unit to be recognized is provided. The cart lamp display system includes a plurality of cart lamp indicators 3 respectively attached to the plurality of cart storage units, and the outside of the picking cart. A cart indicator controller 5 for turning on or off a cart lamp indicator which is instructed by the control device 6 wirelessly, and a cart wiring 7 for connecting the cart lamp indicator 3 and the cart indicator controller 5. It is configured to have.

That is, according to the configuration of Patent Document 1, the cart lamp indicator 3 provided in each of the plurality of cart storage units 2 needs the cart wiring 7 for lighting or blinking.

In Patent Document 2, the RFID tag 10 is used for managing the cold insulation box 50 shown in FIG. As shown in FIG. 1, the RFID tag 10 includes a battery serving as a power source, two antennas 2 and 3, an active communication unit 4, a passive communication unit 5, and a control microcomputer 6 serving as a control unit. And an interface section 7 and a memory 8. As the battery 1, an appropriate battery such as an alkaline battery or a nickel battery can be used and serves as a power source for the entire RFID tag 10.

That is, according to Patent Document 2, an active RFID tag having a built-in battery is used.

In Patent Document 3, in a wireless tag including a light emitting diode that receives an AC transmission signal transmitted from a reader/writer as an AC reception signal, even if the AC reception signal is a weak signal, a radio that causes the light emitting diode to emit light. Tags are disclosed. According to Patent Document 3, as shown in FIG. 4 (or FIG. 9, FIG. 11), the wireless tag 201 (or 251, 261) includes a transmitting/receiving antenna 221, a chip 211 (or 215, 216), and a light emitting diode 231. The chip 211 (or 215, 216) includes a storage unit 2112, a demodulation unit 2113, a modulation unit 3114, a power supply 2115 (or 2118), a driver 2116, and a control unit 2111 (or 2117, 2115). .. As shown in FIGS. 5 and 12, the power supply 2115 is connected to the transmission/reception antenna 221, and rectifies the reception AC voltage obtained from the AC reception signal received by the transmission/reception antenna 221 into a DC voltage. ..

JP, 2010-064823, A JP, 2015-185134, A JP, 2010-002971, A

However, in the case of Patent Document 1, since wiring is required to turn on or blink a plurality of cart lamp indicators, the more indicators there are, the more costly it is to manufacture the picking cart, which is a constituent requirement to use. And there is a problem that time increases. Further, in the case of Patent Document 2, since a battery is required, there is a problem that periodic maintenance is required for battery replacement. In addition, in the case of Patent Document 3, the means for supplying power for driving the demodulation unit, the control unit, and the storage unit is unclear in FIG. 4, FIG. 9, or FIG. There is a problem that it is unclear at what timing the collation of the ID included in the ID and the ID stored in the storage unit and the driving of the display are performed.

The present invention has been made to solve such a conventional problem, and is for replacing a wireless tag and a battery without increasing the cost and time for manufacturing the constituent elements to be used even if the number of display devices increases. RFID tags that do not require regular maintenance, or RFID tags that can clarify the timing of collating IDs received from outside and IDs stored in advance and driving the display, or these An object is to provide a wireless tag in any combination.

In order to achieve the above object, a display driving device according to the present invention includes an antenna that receives a high frequency signal transmitted from an external device, a rectifier circuit that converts the high frequency signal received by the antenna into a DC voltage, and The wireless communication circuit that demodulates the modulated data included in the high-frequency signal received by the antenna is compared with the identification information included in the data demodulated by the wireless communication circuit and the own identification information stored in advance. A control circuit for determining whether or not there is a control circuit, a first charging circuit for charging the DC voltage converted by the rectification circuit and supplying power to the wireless communication circuit and the control circuit, and the control circuit A first switch element that is conducted by the control circuit when it is determined that information is collated, and a DC voltage that is converted by the rectifier circuit after being connected to the rectifier circuit due to conduction of the first switch element. A second charging circuit for charging, a second switch element for connecting between the second charging circuit and the display, and a display, wherein the control circuit is provided in the second charging circuit. When the charged DC voltage satisfies a preset condition, the second switch element is turned on to drive the display.

According to the display driving device of the present invention, since wiring is not required, cost and time do not increase in manufacturing the constituent elements to be used even if the number of display devices increases, and periodic maintenance for battery replacement is possible. Is obtained, or an effect that the timing of the collation of the ID received from the outside and the ID stored in advance inside and the drive of the display can be clarified is obtained.

1A is a plan view showing the display drive device according to the first embodiment of the present invention, in which FIG. 7A is a plan view thereof, FIG. 6B is a cross-sectional view thereof, and FIG. FIG. FIG. 3 is a block diagram showing a configuration of an electronic circuit of the display drive device in the first embodiment. 3 is a flowchart showing a display driving method executed by the control circuit of FIG. 2. It is a block diagram which shows the structure of the electronic circuit of the display drive device in the 2nd Embodiment of this invention. It is a front view which shows the goods shelf of the picking system to which the display drive device of 2nd Embodiment is applied. It is a top view of a wearable terminal unit in a 2nd embodiment of the present invention.

Hereinafter, first and second embodiments of the display driving device according to the present invention will be described with reference to FIGS. 1 to 6. In a system for managing a large number of articles, indicators such as a 7-segment LED or a single LED (light emitting diode) are used to recognize the position of a particular article. In the first and second embodiments, the display device incorporating the display drive device is applied to the article shelf of the picking system.

1A and 1B show a display 1 incorporating a display drive device according to a first embodiment of the present invention, where FIG. 1A is a plan view thereof, FIG. 1B is a sectional view thereof, and FIG. It is a front view of the article shelf 21 in the picking system. The article shelf 21 in FIG. 1C is provided with the display device 1 at each frontage 22 corresponding to the type of article.

In FIG. 1B, a display 1 having a built-in display driving device has a structure of three layers (or four layers or more). The first layer 1a on the upper surface is an antenna formed of a transparent conductive material (ITO: indium tin oxide). The second layer 1b on the intermediate surface is a 7-segment LED. The third layer 1c on the lower surface is an electronic circuit (integrated circuit) of the display driving device. The electronic circuit includes a large-capacity large-capacity capacitor. This will be described later. Although not shown in FIG. 1B, the layers are electrically connected to each other.

FIG. 2 is a block diagram showing the configuration of the electronic circuit of the display drive device incorporated in the display device 1 according to the first embodiment. In FIG. 2, the antenna 11 is formed on the first layer 1a of FIG. 1(B) as described above and is transmitted from a reader/writer device (not shown) which is an external device, at 920 MHz (or 2.45 GHz). The radio wave of the high frequency signal (RF signal) is received.

The wireless communication circuit/control circuit 12 is a main part of the display driving device. The wireless communication circuit demodulates the RF signal input from the antenna 11. The demodulated received data includes a command, a parameter, etc. following the head preamble. Since the reader/writer device generally communicates with many display driving devices, an ID for identifying each display driving device is included in the command. On the other hand, the control circuit of each display driver has a rewritable non-volatile memory that stores its own ID that identifies the display 1 of the frontage 22 of FIG. The control circuit determines whether or not the received data demodulated by the wireless communication circuit includes its own ID.

When the received data includes its own ID, the control circuit creates a response message and sends it to the reader/writer device via the wireless communication circuit. The control circuit also includes a work memory (not shown), and stores parameter data (DATA) in the work memory.

The rectifier circuit 13 is composed of, for example, a diode bridge (not shown), rectifies the RF signal input from the antenna 11 and converts it into a DC voltage. The parallel circuit of the resistor R1 and the capacitor C1 has one end connected to the reference potential VSS (eg, ground) and the other end connected to the terminal P1 of the wireless communication circuit/control circuit 12.

The DC voltage of the rectifier circuit 13 is charged into the parallel circuit of the resistor R1 and the capacitor C1 through the diode D1, and the charging voltage V1 is supplied to the terminal P1 of the wireless communication circuit/control circuit 12. Since the wireless communication circuit/control circuit 12 does not have a power source itself, this voltage V1 serves as a power source. Note that the time constant τ1 (=C1R1) of the resistor R1 and the capacitor C1 is very small, and charging is performed in an extremely short time by the preamble of the RF signal. Therefore, the modulated data of the command and parameter following the preamble is demodulated by the wireless communication circuit.

Here, the wireless communication circuit/control circuit 12, the rectifier circuit 13, and the charging circuit for the resistor R1 and the capacitor C1 constitute a conventional display driving device. The diode D1 is not an indispensable constituent element of the conventional display driving device.

The transistor Q1, which is a semiconductor switch, is off when the trigger signal TR1 of the wireless communication circuit/control circuit 12 is low level, and is on when it is high level. Further, the transistor Q2 is off when the trigger signal TR2 of the wireless communication circuit/control circuit 12 is low level and is on when it is high level. The parallel circuit of the resistor R2 and the capacitor C2 has one end connected to the reference potential VSS and the other end connected to the transistors Q1 and Q2 and the terminal P2 of the wireless communication circuit/control circuit 12.

The parallel circuit of the resistor R2 and the capacitor C2 is charged by the DC voltage of the rectifier circuit 13 when the transistor Q1 is on. As described above, the capacitor C2 has a large capacity, and the time constant τ2 (=C2R2) of the parallel circuit of the resistor R2 and the capacitor C2 is considerably larger than the time constant τ1 of the resistor R1 and the capacitor C1, and τ2>>τ1. Have a relationship. Therefore, it is charged more slowly than the parallel circuit of the resistor R1 and the capacitor C1.

The 7-segment LED display 1 shown in FIG. 1 is connected between the transistor Q2 and the reference potential VSS, and the DATA from the wireless communication circuit/control circuit 12 turns on (or blinks) each segment and Lighting is controlled.

FIG. 3 is a flowchart showing a display driving method executed by the control circuit. The control circuit executes the flowchart of FIG. 3 in accordance with a control program stored in advance in a rewritable nonvolatile program memory. The control circuit first extracts the ID from the reception data obtained from the wireless communication circuit (step S101). Next, the control circuit determines whether or not the extracted ID matches the stored own ID (step S102).

When the extracted ID and the self ID match (step S102; YES), communication processing is executed with the reader/writer device via the wireless communication circuit (step S103). For example, a response message indicating that the type of the article to be stored is designated and the number of articles to be picked is recognized is transmitted to the reader/writer device.

Next, the control circuit sets the trigger signal TR1 to a high level (ON) to turn on the transistor Q1 (step S104). As a result, the DC voltage output from the rectifier circuit 13 charges the parallel circuit of the resistor R2 and the capacitor C2. At the timing when the trigger signal TR1 is turned on, the parallel circuit of the resistor R1 and the capacitor C1 is already charged with the DC voltage from the rectifier circuit 13, and the voltage V1 is supplied to the terminal P1 of the wireless communication circuit/control circuit 12. There is.

The control circuit detects the voltage V1 and the voltage V2 of the parallel circuit of the resistor R2 and the capacitor C2 (step S105), and determines whether or not the value of the voltage V2+ΔV is the value of the voltage V1 or more (step S106). Here, ΔV is a value equal to or larger than the sum of the forward voltage of D1 and the conduction voltage of Q1, and is a variable value set in the control program. That is, in step S106, it is determined whether or not the value of V2, which is slowly charged and rises, has reached the value of V1.

When the value of V2 has reached the value of V1 (step S106; YES), the control circuit sets the trigger signal TR2 to a high level (ON) to make Q2 conductive (step S107). As a result, the voltage V2 is supplied to the display 1 of the 7-segment LED.

Next, the control circuit outputs DATA indicating the number of articles to be picked by the worker from the article rack to the display device 1 (step S108). As a result, as shown in FIG. 1C, the indicator 1(t) at the frontage 22 of the picking target lights (or blinks).

The end time of turning on (or blinking) the display 1(t) is a variable value set in the control program. Alternatively, a lighting (or blinking) time is defined by a command from the reader/writer device. When the display drive is also attached to the articles stored in the article rack, the reader/writer device can detect the completion of picking by the operator, and thus the control circuit for the end of the lighting (or blinking) time can be obtained. Can be notified.

The control circuit determines whether or not the display has ended (step S109). When the display has ended, the DATA output is stopped (step S110), and the trigger signals TR1 and TR2 are turned off (low level) (step S111). ).

The capacitor C2 may be an electric double layer capacitor. An electric double-layer capacitor (EDLC) is a capacitor in which the electric storage amount is remarkably increased by utilizing a physical phenomenon called an electric double layer. Since there is little deterioration due to charging and discharging, there is an advantage that the product life is long.

As described above, according to the first embodiment, since wiring is not required, cost and time do not increase in manufacturing the constituent elements to be used even if the number of display devices increases. In addition, there is no need for regular maintenance for battery replacement. Further, it is possible to clarify the timing of collating the ID received from the outside and the ID stored in advance inside and driving the display.

Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram showing an electronic circuit of the display driving device in the second embodiment. In the second embodiment, the display driven by the display drive device is configured by a light emitting diode (LED) instead of the display 1 of the 7-segment LED in FIG. Other configurations are the same as those in FIG. Therefore, only the parts different from the block diagram of FIG. 2 will be described.

The anode of the light emitting diode D2 is connected to the transistor Q2, and the cathode thereof is connected to the reference voltage VSS via the protection resistor R3. That is, the light emitting diode D2 is controlled to be turned on, blinked, and turned off by the trigger signal TR2 output from the control circuit. Therefore, the DATA signal line shown in FIG. 2 is not necessary. Therefore, the flowchart of the driving method executed by the control circuit is the same as the flowchart of FIG. 3 except that only the processes of step S108 and step S110 are omitted, and therefore the drawing and description thereof are omitted.

FIG. 5 is a front view of the article shelf 21 in the picking system to which the LED is applied. The article shelf 21 in FIG. 1 is provided with an LED 23 at each frontage 22 corresponding to the type of article. Then, when the trigger signal TR2 of the control circuit becomes high level (ON) (or ON/OFF) in FIG. 4, D2 lights up (or blinks), so that the picking target LED 23(t) in FIG. 5 lights up (or Flashes).

The end time of lighting (or blinking) of the LED 23(t) is a variable value set in the control program. However, the LED 23 cannot indicate the number of articles to be picked like the 7-segment LED of the first embodiment. Therefore, in the second embodiment, a terminal device that can indicate the number of articles to be picked is used as an auxiliary device.

Next, a wearable terminal device according to the second embodiment of the present invention and a wearable terminal device used for picking an article will be described. FIG. 6 is a plan view of the wearable terminal device 31 which can be worn by a worker who takes out an article from the frontage 22 of the article shelf 21 of FIG. The wearable terminal device 31 is operated by a photoelectric conversion element 32 for converting light energy into electric energy, a display device (7-segment LED) 33 for digitally displaying the number of articles designated by lighting or blinking, and an operator after finishing picking. The reset switch 34 is provided. Further, although not shown in the figure, the wearable terminal device 31 has a structure in which a wireless tag is applied, as in the display drive device of the first embodiment. That is, the electronic circuit shown in FIG. 2 is provided inside. However, the configurations and operations of the wireless communication circuit and the control circuit in the wearable terminal device 31 are different from those in the first embodiment. The configuration and operation of the wearable terminal device 31 will be described below with reference to FIG. 2 in the first embodiment.

The wearable terminal device 31 includes an antenna that receives a high-frequency signal transmitted from an external device, a rectifier circuit that converts the high-frequency signal received by the antenna into a DC voltage, and a modulated signal included in the high-frequency signal received by the antenna. Data demodulated by the wireless communication circuit, a first charging circuit for charging the DC voltage converted by the rectifier circuit to supply power to the wireless communication circuit and the control circuit, and the data demodulated by the wireless communication circuit A control circuit for determining picking information indicating the storage position of the article to be picked and the number of articles to be picked based on the identification information included in the control circuit; and a control circuit that is conducted by the control circuit when the control circuit determines the picking information. Between the first switching element, the second charging circuit that is connected to the rectifying circuit by conduction of the first switching element, and then charges the DC voltage converted by the rectifying circuit, and the second charging circuit and the indicator. And a second switch element for connecting to each other and a display. Then, the control circuit transmits a charge start command to an external device via the wireless communication circuit when or before the first switch element is made conductive, and the direct current charged in the second charge circuit is charged. When the voltage satisfies a preset condition, the second switch element is turned on to drive the display. When the external device receives the charge start command, it transmits an unmodulated or preamble-modulated radio wave.

The operator operates the reset switch 34 after the end of picking. Upon detecting the operation of the reset switch 34, the control circuit notifies the external device of the end of the picking work via the wireless communication circuit. Upon receiving this notification, the external device ends the transmission of the radio wave that has not been modulated or has been modulated with the preamble.

If a display drive is attached to the article itself, the picked article is stored in a transporting means such as a cart. Therefore, by providing the transporting means with a communication device that communicates with an external device, the picking work can be performed. It is also possible to notify the external device of the status. In this case, the reset switch 34 becomes unnecessary.

Claims (14)

An antenna for receiving a high frequency signal transmitted from an external device,
A rectifier circuit that converts a high-frequency signal received by the antenna into a DC voltage,
A wireless communication circuit for demodulating the modulated data contained in the high frequency signal received by the antenna;
A control circuit for determining whether or not the identification information included in the data demodulated by the wireless communication circuit and its own identification information stored in advance are compared with each other,
A first charging circuit for charging the DC voltage converted by the rectifying circuit to supply power to the wireless communication circuit and the control circuit;
A first switch element that is turned on by the control circuit when the control circuit determines a match between identification information;
A second charging circuit for charging the DC voltage converted by the rectifying circuit after being connected to the rectifying circuit by conduction of the first switch element;
A second switch element connecting between the second charging circuit and the display;
And an indicator,
The control circuit causes the second switch element to conduct to drive the display device when the DC voltage charged in the second charging circuit satisfies a preset condition.
A display drive device characterized by the above. The display drive device according to claim 1, wherein the antenna, the rectifier circuit, the wireless communication circuit, the control circuit, and the first charging circuit are configured by applying a wireless tag. The display driving device according to claim 1, wherein the second charging circuit has a time constant that defines a charging speed larger than a time constant of the first charging circuit. The display drive according to claim 1, wherein the first charging circuit starts charging from a head of a preamble included before data included in a high frequency signal received by the antenna. apparatus. 5. The set condition is a condition in which a DC voltage charged in the second charging circuit satisfies a rated drive voltage of the display unit, according to any one of claims 1 to 4. Display drive device. The display drive device according to claim 1, wherein the second charging circuit includes an electric double layer capacitor. 7. The control circuit conducts the second switch element during a preset period or a period until a display stop command is received from the external device, according to any one of claims 1 to 6. The display drive device according to item 1. 8. The control circuit inputs data representing display contents to the display device when the second switch element is turned on to drive the display device. The display drive device according to the item. 9. The display drive device according to claim 1, wherein the display device is a display device provided at a frontage indicating various types of articles in article storage means of a physical distribution picking system. .. The display drive device according to claim 9, wherein the display is turned on or blinks at a frontage of an article to be picked. A wearable terminal device used for picking an article,
An antenna for receiving a high frequency signal transmitted from an external device,
A rectifier circuit that converts a high-frequency signal received by the antenna into a DC voltage,
A wireless communication circuit for demodulating the modulated data contained in the high frequency signal received by the antenna;
A first charging circuit for charging the DC voltage converted by the rectifying circuit to supply power to the wireless communication circuit and the control circuit;
A control circuit that determines picking information indicating the storage position of the article to be picked and the number of articles to be picked based on the identification information included in the data demodulated by the wireless communication circuit;
A first switch element that is turned on by the control circuit when the control circuit determines the picking information;
A second charging circuit for charging the DC voltage converted by the rectifying circuit after being connected to the rectifying circuit by conduction of the first switch element;
A second switch element connecting between the second charging circuit and the display;
And an indicator,
The control circuit transmits a charge start command to the external device via the wireless communication circuit when or before the first switch element is turned on, and the second charge circuit is charged. When the direct current voltage satisfies a preset condition, the second switch element is turned on to drive the display,
A wearable terminal device characterized by the above. The wearable terminal device according to claim 11, wherein the antenna, the rectifier circuit, the wireless communication circuit, the control circuit, and the first charging circuit are configured by applying a wireless tag. The wearable terminal device according to claim 11 or 12, wherein the set condition is a condition in which the DC voltage charged in the second charging circuit satisfies a rated drive voltage of the display. 14. The display drive device according to claim 11, wherein the second charging circuit has an electric double layer capacitor.

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