JP2000215278A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent such actions of radio tapping and data forgery. SOLUTION: A display unit 1 displays a message to the user of a non-contact IC card 10. A transmission/reception/reflection detection circuit 4 supplies power to the card 10 and executes communication with a radio wave or electromagnetic guidance through loop antennas 3. A supply power control circuit 5 detects the position of the card 10 and controls the power supplied to the card 10 so that the power becomes minimal so far as the communication is assured. Thus radio wave more than necessary is not radiated to outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for realizing an interface with a non-contact IC card.

[0002]

2. Description of the Related Art Conventionally, magnetic cards, which have been widely used as data carriers, are widely used at present because they can be manufactured at low cost and data can be read and written relatively easily. However, the data volume was small, data was tampered with, and counterfeit products appeared, which became a social problem. Contact-type IC cards have a large data capacity and are also excellent in terms of security. However, once a card is read into a card reader / writer and magnetically and electrically communicated, the reader / writer has moving parts and wear and tear. There are many parts, and a great deal of labor is required for daily maintenance.

Therefore, non-contact IC cards have been used as highly convenient and secure data carriers. A non-contact IC card has a large data capacity and internal IC processing is as fast as a contact IC card. Also,
Since it has a unique identification number (ID number) and performs encryption processing by an internal IC, it is also excellent in security. In addition, since a contact portion is not required for reading and writing data, there is an advantage that it is resistant to breakdown and wear, and ordinary maintenance is simple. Therefore, telephone cards, buses,
Applications in various fields, such as train tickets and highway toll collection, are being studied.

Incidentally, conventional magnetic cards and contact ICs
In the case of a card, the card has been used by inserting the card into an insertion slot of a card reader / writer. On the other hand, in the non-contact IC card, since a mechanism such as an insertion slot is not provided in the card reader / writer, it is important to have a user interface for teaching a user how to use the card. Currently, the most commonly used user interface is an image display device (CRT, liquid crystal display, etc.), a keyboard, a mouse, a touch panel, and the like.

[0005]

As described above, in the conventional contact-type IC card, since a movable portion is required for a card reader / writer for realizing a user interface, it is difficult to reduce the size and the installation area and cost are reduced. There was a problem that it increased. In addition, there is a problem that a great deal of labor is required for daily maintenance due to the presence of worn parts such as movable parts and electrodes. Further, in the non-contact IC card, since the interrogator communicates with the non-contact IC card by radio waves or electromagnetic induction, there is a problem that there is a risk of information leakage to the outside. An object of the present invention is to provide an image display device having a communication function with a non-contact IC card and capable of preventing acts such as wireless eavesdropping and data falsification. With the goal.

[0006]

The image display device of the present invention has a display means (1) for displaying a message to a user of the non-contact IC card (10). A plurality of loop antennas (3, 3a, 3b, 3c) are provided near or inside the display means, and non-contact is performed by transmitting / receiving radio waves (radiated electromagnetic fields) or electromagnetic induction (induced electromagnetic fields) via the loop antennas. Transmitting / receiving means (4) for supplying power to and communicating with the IC card, and supplying power for detecting the position of the non-contact IC card and controlling the power supplied to the card so as to have a minimum communicable power. Control means (5). Thus, by providing the plurality of loop antennas and the supply power control means, the position of the non-contact IC card is detected, and the minimum communicable power is supplied to the non-contact IC card. Is not irradiated. As a result, acts such as wireless eavesdropping and data falsification can be prevented. In addition, by integrating the image display device and the communication mechanism for the non-contact IC card, the description of the method of use is simplified, and the user can perform two-way communication while looking at the screen of the display means. Improvement can be achieved.

The loop antenna is made of a conductive thin wire, a conductive paint or a transparent conductive paint. Further, the display means is a liquid crystal display device, and the loop antenna is made of a transparent conductive paint disposed in a multilayer substrate of the liquid crystal display device. One example of the configuration of the image display device includes an input unit (8) for a user of the non-contact IC card to input information, a message output to the display unit, input / output of information via a transmission / reception unit, or Means (7) for providing a service to the user of the contactless IC card by inputting information from the input means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram of an image display device according to a first embodiment of the present invention. The image display device according to the present embodiment constantly transmits a display 1 for displaying a message to the user of the non-contact IC card 10 and a radio wave (interrogation radio wave) for prompting the non-contact IC card 10 to respond. The interrogator 2 emitting the light, the control device 7 for performing a process for providing a service to the user of the non-contact IC card 10, and the input device 8 for the user of the non-contact IC card 10 to input information And

Non-contact IC card 1 according to the present embodiment
Numeral 0 includes a power supply circuit (not shown) for converting received radio waves into electric power, and is operated by this electric power. The interrogator 2 transmits information and power to the non-contact IC card 10 via the loop antenna 3 and a planar loop antenna 3 which is a rectangular antenna disposed on the display screen of the display 1, and , A transmission / reception / reflection detection circuit 4 for receiving information from the card 10 and a position of the non-contact IC card 10 to control the supply power to the card 10 so that the minimum power for communication is obtained. And a data processing circuit 6 for controlling the entire interrogator 2 and exchanging information with the control device 7.

On the display screen of the display 1, four loop antennas 3 are regularly arranged. Each loop antenna 3 is formed of a very thin conductive wire so as not to impair the visibility of an image displayed on the display 1. The surfaces of the display 1 and the loop antenna 3 are covered with transparent glass (not shown).

Next, the operation of such an image display device will be described. FIG. 2 is a flowchart for explaining the operation of the image display device of FIG. The transmission / reception / reflection detection circuit 4 in the interrogator 2 generates a radio frequency signal of a specific frequency for prompting the non-contact IC card 10 to respond, and supplies this to the loop antenna 3. As a result, radio waves (interrogation radio waves) having such an intensity that the non-contact IC card 10 can be recognized when the non-contact IC card 10 comes close are constantly and uniformly emitted from the four loop antennas 3 (step 101 in FIG. 2).

The supply power control circuit 5 includes a loop antenna 3
And the coupling state between the antenna 3 (not shown) of the card 10 and the antenna 3 detected by the transmission / reception / reflection detection circuit 4,
Alternatively, it is determined whether or not the non-contact IC card 10 is nearby based on whether or not there is a signal response from the card 10 (step 102). When determining that the non-contact IC card 10 is nearby, the supply power control circuit 5 monitors the reflection when radio waves are radiated from each loop antenna 3 via the loop antenna 3 and the transmission / reception / reflection detection circuit 4, and The position of the contact IC card 10 is estimated (step 103).

When the non-contact IC card 10 is located at one of the center positions of the four loop antennas 3 and when the non-contact IC card 10 is moved away from the center position, the mutual inductance changes and the reflection state of the radio wave changes. By comparing the state of this reflection among the four loop antennas 3, the position of the non-contact IC card 10 can be roughly specified.

The supply power control circuit 5 interrupts the supply of power to the loop antenna 3 distant from the non-contact IC card 10 based on the estimated position of the non-contact IC card 10, for example. The power to be supplied to each loop antenna 3 is controlled so that the minimum power that can communicate with the loop antenna 10 is obtained. Thus, it is possible to prevent eavesdropping of information and data falsification from outside, and it is possible to perform communication in accordance with the regulations of the Radio Law.

After controlling the supplied power, the data processing circuit 6
Data communication with the non-contact IC card 10 is started (step 105). First, the interrogator 2 and the non-contact IC card 10
Are performed (step 106). That is,
The data processing circuit 6 outputs the identification information (ID number) assigned in advance to the interrogator 2 to the transmission / reception / reflection detection circuit 4. The transmission / reception / reflection detection circuit 4 modulates the radio frequency signal based on the identification information and supplies the modulated signal to the loop antenna 3.

Radio waves radiated from the loop antenna 3 of the interrogator 2 are received by the antenna of the non-contact IC card 10,
The signal is demodulated by the transmitting / receiving circuit (not shown) of the IC card 10 into the original identification information. The control circuit (not shown) of the IC card 10 that has received the identification information of the interrogator 2 determines that the identification information is a legitimate communication partner if the identification information is a registered number.
The identification information (ID number) previously assigned to the IC card 10 is passed to the transmission / reception circuit.

The transmission / reception circuit of the IC card 10 controls whether the resonance circuit including the antenna of the IC card is brought into a resonance state according to the identification information received from the control circuit. The resonance and non-resonance are detected by the loop antenna 3 of the interrogator 2 and the transmission / reception / reflection detection circuit 4 demodulates, whereby the identification information of the non-contact IC card 10 can be obtained. When the identification information of the non-contact IC card 10 is a registered number, the data processing circuit 6 recognizes that the non-contact IC card 10 is a legitimate communication partner. Thus, mutual authentication between the interrogator 2 and the non-contact IC card 10 is performed.

Next, the data processing circuit 6 assigns a convenient management number (for example, a short number such as No. 1 or No. 2) for simplifying the processing to the non-contact IC card 10 and stores it in its own memory. At the same time, the management number is transmitted to the IC card 10 in the same manner as the identification information described above.
The control circuit of the IC card 10 that has received the management number writes the management number into a memory (not shown) (step 107). This management number is used in the subsequent communication and data processing.

Next, the control device 7 which is a higher-level device of the interrogator 2 displays a message on the screen of the display device 1 to start providing a service (step 108). At this time, when personal authentication is required, the control device 7 causes the display 1 to display a message prompting the user to input a personal identification number. The user holding the non-contact IC card 10 operates the input device 8 in response to the message and inputs a password.

If the password received from the input device 8 is a registered number, the control device 7 determines that the user is an authorized user and provides a predetermined service. The service is provided by outputting a message to the display 1, communicating with the non-contact IC card 10 via the loop antenna 3, the transmission / reception / reflection detection circuit 4, and the data processing circuit 6, and inputting information from the input device 8. Yes (step 109).
The service provision ends with the above operation (step 11).
0).

[Embodiment 2] FIG. 3 is an external view of an image display apparatus according to a second embodiment of the present invention.
3A is an external view of the operation panel of the image display device as viewed from above, and FIG. 3B is an external view of the image display device as viewed from the side. Also in the present embodiment, the configuration as an image display device is almost the same as that of the first embodiment. Therefore, even if the configuration is not shown in FIG. 3, the same configuration as that of the first embodiment will be described using the same reference numerals as those in FIG.

The loop antenna 3a according to the present embodiment
Are made of a transparent electrode (transparent conductive paint). The installation mode of the loop antenna 3a is the same as that of the first embodiment. As shown in FIG. 3A, a message “Please hold the non-contact IC” is displayed on the screen of the display 1.

In response to this message, the user places the non-contact IC card 10 on the screen of the display 1 as shown in FIG.
The control device 7 identifies the user and determines the level of the service that can be provided by holding the card 10 over the card 10 or placing the card 10 on the screen. Thereby, the user can receive necessary services.

Although a series of operation methods are different from those of the conventional contact type IC card, the operation can be performed while looking at the screen of the display 1 and the position where the non-contact type IC card 10 is placed can be visually displayed. Because the usage method is simple such as
There is almost no need for beginners to learn how to use. Further, by exchanging information between the non-contact IC card 10 and the present apparatus, it is possible to provide added value to the card 10 and to keep the card 10 on the screen during the use period. It also makes it easy to enter usage information and specific information written in the.

[Embodiment 3] FIG. 4 is an external view of an image display apparatus according to a third embodiment of the present invention, and the same components as those in FIG. 1 are denoted by the same reference numerals. In the first and second embodiments, the loop antennas 3 and 3a are arranged on the display screen of the display 1, but in the present embodiment, the conductors are provided in the housing 9 of the image display device on which the display 1 is mounted. A loop antenna 3b made of In this case, the housing 9 is made of a non-metal.

Non-contact I with the loop antenna 3b in the housing 9
By shifting the positional relationship between the C cards 10 to some extent in the vertical direction from the same plane, the power transmission efficiency from the interrogator 2 can be increased.

[Fourth Embodiment] FIG. 5 is a sectional view of a display device of an image display device according to a fourth embodiment of the present invention. In the present embodiment, a liquid crystal display device is used as the display 1. The liquid crystal display device includes a liquid crystal 11, a glass substrate 1
2. Display element (not shown) (thin film transistor: TFT)
, A polarizing filter 14, a backlight 15, and a circuit board 16.

In this embodiment, the transparent electrode 13 used for driving the liquid crystal in the multilayer substrate of the liquid crystal display device is used.
By forming the loop antenna 3c with the same transparent electrode between them, integral molding with the liquid crystal display device becomes possible. In the case of the liquid crystal display device, most of the liquid crystal display device is made of non-metal, so even if a loop antenna is arranged near the back surface of the liquid crystal display device, the display is not disturbed by a weak magnetic field generated by the loop antenna. Non-contact IC card 1
Communication with 0 is possible.

The present invention is not limited to the above embodiment, but includes all modifications included in the gist of the present invention. For example, the input device 8 may be a touch panel arranged on the display screen of the display 1.

[0030]

According to the present invention, the communication function with the non-contact IC card can be realized by providing the loop antenna and the transmitting / receiving means. As a result, the moving parts and the worn parts such as electrodes, which are required in the conventional card reader / writer of the contact type IC card, become unnecessary, so that the size of the image display device can be reduced, the reliability is high, and the maintenance and management can be performed. The effect is easy and the cost can be reduced. In addition, by providing a plurality of loop antennas and a supply power control unit, it is possible to prevent an act such as wireless eavesdropping or data falsification, and to improve a security function. In addition, by integrating the image display device and the communication mechanism for the non-contact IC card, the description of the method of use is simplified, and the user can perform two-way communication while looking at the screen of the display means. Improvement can be achieved. For example, the usage method and the place where the non-contact IC card is placed can be specified by a message displayed on the display means, and a user interface that can be easily used even by a beginner can be realized.

Further, by forming the loop antenna with a conductive thin wire, a conductive paint or a transparent conductive paint, a loop antenna for communication with a non-contact IC card can be realized without impairing the display function of the display means. it can.

Further, by forming a loop antenna made of a transparent conductive paint in a multilayer substrate of a liquid crystal display device as a display means, it is possible to realize an integral formation with the liquid crystal display device.

Further, by providing the input means and the service providing means, the user of the non-contact IC card can easily perform authentication, service enjoyment, log management, etc. on the screen of the display means. .

[Brief description of the drawings]

FIG. 1 is a block diagram of an image display device according to a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the image display device of FIG. 1;

FIG. 3 is an external view of an image display device according to a second embodiment of the present invention.

FIG. 4 is an external view of an image display device according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a display device of an image display device according to a fourth embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 display, 2 interrogator, 3 3a, 3b, 3c loop antenna, 4 transmission / reception / reflection detection circuit, 5 supply power control circuit, 6 data processing circuit, 7 control device, 8 input Apparatus, 9 housing, 10 contactless IC card, 11 liquid crystal, 12 glass substrate, 13 transparent electrode, 14 polarizing filter, 15 backlight, 16 circuit board.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Nakajima 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Toshiho Dobashi 3--19, Nishishinjuku, Shinjuku-ku, Tokyo No. 2 Inside Nippon Telegraph and Telephone Corporation (72) Inventor Shigeru Date 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term within Nippon Telegraph and Telephone Corporation 5B058 CA15 CA22 KA01 KA06 KA32 KA33 5K012 AB05 AC06 AC08 AC10 AE13 BA03 5K067 AA34 BB32 DD52 EE35 FF02 FF23 KK05

Claims (4)

[Claims] 1. An image display device for realizing an interface with a non-contact IC card, a display means for displaying a message to a user of the non-contact IC card, and a display provided near or inside the display means. A plurality of loop antennas; transmitting and receiving means for transmitting and receiving electric power to the non-contact IC card by transmitting and receiving radio waves or electromagnetic induction via the loop antenna; and detecting a position of the non-contact IC card to minimize communication. And a supply power control means for controlling the supply power to the card so as to obtain the power of the image display device. 2. The image display device according to claim 1, wherein said loop antenna is made of a conductive thin wire, a conductive paint, or a transparent conductive paint. 3. The image display device according to claim 1, wherein said display means is a liquid crystal display device, and said loop antenna is made of a transparent conductive paint disposed in a multilayer substrate of said liquid crystal display device. An image display device characterized by the above-mentioned. 4. The image display device according to claim 1, wherein an input means for a user of the non-contact IC card to input information, a message output to the display means, and an input / output of information via a transmission / reception means. Alternatively, by inputting information from the input means,
Means for providing a service to a user of the non-contact IC card.