JP2008282421A - Ic card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an IC card that enables recognition of the operating status of the IC card from the appearance of the IC card. <P>SOLUTION: The IC card has a connection terminal supplied with a circuit voltage from a reader/writer, a semiconductor integrated circuit driven by the circuit voltage, a converter for generating an AC voltage or switching voltage from the circuit voltage supplied to the connection terminal, one or more inorganic electroluminescence elements excited by the output voltage of the converter to emit visible light, and a switching circuit disposed between the converter and the inorganic electroluminescence elements or between the converter and the connection terminal. The semiconductor integrated circuit generates a control signal for turning on or off the switching circuit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an IC card that transmits / receives data to / from a reader / writer and has a light emitting element.

The operation status of the IC card, for example, whether or not power is supplied to the IC card from an external device such as a reader / writer may be displayed on the display device of the external device (coupling device).
For example, a display device such as a light emitting diode (LED) or a liquid crystal (LCD) is provided in the external device, the operation status of the IC card, for example, communication with the IC card is determined, and the display device is connected to the IC card. Displays the operating status.
As a display method, for example, there are a method of turning on or blinking an LED according to the operation status of the IC card, or changing a color of lighting or blinking to green, red or the like according to the operation status of the IC card.
There is also a method of displaying characters indicating the operating status of the IC card on a display device such as a liquid crystal (LCD), a cathode ray tube (CRT), or a plasma display of an external device.
On the other hand, there is a non-contact type IC card having an LED for optical communication. In this method, communication between the IC card and the external device is performed by infrared communication in the same manner as the infrared remote controller.

It is difficult for the IC card user (card user) to know the operation status of the IC card from the appearance of the IC card, particularly the non-contact IC card. For this reason, it is necessary to look at the display device on the external device side by bringing the IC card close to the external device.
When one external device can communicate with multiple IC cards at the same time, the display device must respond to the identification number (ID number) when individually informing the operation status of the IC card to multiple card users. Displays the operating status of the IC card. At this time, the card user needs to identify his / her identification number from the display information, which is inconvenient.

In the case of an infrared communication type IC card using an LED, the purpose of mounting the LED is to communicate with the card by an infrared ray, and not to display the operation status of the IC card to the card user. Infrared rays are not visible rays. For this reason, the LED is small and it is difficult to distinguish between lighting and extinguishing.
In order to reduce the power consumption of the IC card, the LED is turned on during data communication, and the LED is turned off during non-communication. For this reason, when processing other than data communication is performed, the LED is in an off state, and it is difficult to know the operating status of the IC card.
An object of the present invention is to provide an IC card that can recognize the operation status of the IC card from the appearance of the IC card.

  The IC card of the present invention includes a connection terminal to which a circuit voltage is supplied from a reader / writer, a semiconductor integrated circuit using the circuit voltage as a drive voltage, and an AC voltage or a switching voltage from the circuit voltage supplied to the connection terminal. A converter for generating visible light, a single or a plurality of inorganic electroluminescent elements that emits visible light when excited by an output voltage of the converter, and between the converter and the inorganic electroluminescent element or between the converter and the connection terminal The semiconductor integrated circuit generates a control signal for turning on or off the switch circuit.

An inorganic electroluminescence element can be reduced in size and thickness, and can be more flexible than a liquid crystal display element using liquid crystal. Moreover, surface light emission is performed, and light emission can be seen from an oblique direction in addition to the front direction.
The IC card is thin and often bends, and the card user often sees the IC card from an oblique direction.
For this reason, the inorganic electroluminescent element is suitable for an IC card, the inorganic electroluminescent element can be easily mounted on the IC card, and the card user can easily recognize the light emission of the inorganic electroluminescent element.

  In the IC card of the present invention, since the inorganic EL element emits surface light, the IC card can emit light in a wide range, and the display of various information can be easily seen by the card user by the inorganic EL element.

  The IC card of the present invention is excited by the output of the converter that inputs the terminal voltage of the connection terminal to which the circuit voltage is supplied from the reader / writer, so that the inorganic EL element emits light. The card user can know the operation of the IC card from the appearance of the IC card. The card user can know from the light emission of the inorganic EL element that power is being received from the reader / writer.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, electroluminescence (EL) will be described.

In recent years, many organic electronic materials have been developed. Among them, there are electroluminescent display materials.
This is a material that emits light when an electric field is applied to a fluorescent material, that is, electroluminescence (EL), and a light-emitting display device using this phenomenon is called an electroluminescence element.

There are two types of EL: an intrinsic EL and a charge injection type EL.
First, intrinsic EL (inorganic EL) will be described.
Intrinsic EL emits light when a thin film of a dielectric layer in which a phosphor is dispersed in a dielectric is sandwiched between electrodes, an alternating voltage is applied and an alternating electric field is applied.
A phosphor using zinc sulfide (ZnS) is generally used, and is also called an inorganic EL because an inorganic compound is used as a light-emitting substance.

FIG. 1A is an explanatory diagram illustrating an example of an inorganic electroluminescence element (inorganic EL element).
This inorganic EL element includes a plastic substrate 1, a transparent electrode 2 laminated on the plastic substrate 1, a dielectric layer 4, an insulating layer 3 surrounding the dielectric layer 4, and a back electrode 5, and is transparent. An AC power supply 9 is connected to the electrode 2 and the back electrode 5.
The dielectric layer 4 is sandwiched between the transparent electrode 2 and the back electrode 5 via the insulating layer 3, and an AC voltage from an AC power source 9 is applied to the dielectric layer 4. A switching voltage that repeats on / off may be applied instead of the AC voltage.
The plastic substrate 1 may be composed of polyethylene terephthalate (PET), and the back electrode 5 may be composed of a transparent electrode such as an ITO electrode.

When an AC voltage or a switching voltage is applied to the inorganic EL element, a high voltage is generated at the interface between the dielectric layer (EL thin film) 4 and the insulating layer 3, and the accelerated electrons pass through the dielectric layer 4 at a high speed. That is, the impurity ions in the dielectric layer 4 emit light.
Depending on the type of impurity ions, the emission colors such as red, green and blue are different.
The dielectric layer 4 becomes a light emitting layer, and the visible light emitted from the dielectric layer 4 is transmitted through the plastic substrate 1, and the visible light can be seen through the plastic substrate 1. As an example, the inorganic EL element can be configured with a thickness of about 0.17 mm, and can consume less than 1 mA.

The inorganic EL element has the following advantages (a) to (f).
(A) It emits light by itself.
(A) Solid and long life.
(C) Light emission can be seen from an oblique direction.
(D) There is no afterimage because it responds at high speed.
(E) High contrast and easy to see.
(F) Small volume and small size.
On the other hand, the drive circuit (driver) of the inorganic EL element needs to generate an AC voltage of about 100V to 300V as an example.

Since the dielectric layer of the inorganic EL element is transparent, it is possible to construct a multicolor inorganic EL element by superimposing the three primary color EL thin films of red, green and blue. This inorganic EL element A full color display can be realized by controlling the power supply to the display.
FIG. 1B is an explanatory diagram illustrating an example of an inorganic EL element in which EL thin films of three primary colors of red, green, and blue are superimposed.
This inorganic EL element includes a plastic substrate 11, insulating layers 21 and 31, transparent electrodes 12, 22 and 32, insulating layers 13, 23 and 33, light emitting dielectric layers 14, 24 and 34, and a transparent electrode 15. , 25, 35. A transparent electrode 12 is laminated on the plastic substrate 11.
The dielectric layer 14 wrapped in the insulating layer 13 forms a blue coloring layer.
The dielectric layer 24 wrapped in the insulating layer 23 forms a green color developing layer.
The dielectric layer 34 wrapped in the insulating layer 33 forms a red color developing layer.
The dielectric layer 14 is sandwiched between the transparent electrodes 12 and 15 via the insulating layer 13, and an AC voltage from an AC power source (not shown) is applied to the dielectric layer 14.
The dielectric layer 24 is sandwiched between the transparent electrodes 22 and 25 via the insulating layer 23, and an AC voltage from an AC power source (not shown) is applied to the dielectric layer 24.
The dielectric layer 34 is sandwiched between the transparent electrodes 32 and 35 via the insulating layer 33, and an AC voltage from an AC power source (not shown) is applied to the dielectric layer 34.
Various colors can be generated and viewed through the plastic substrate 11 by changing the power supply to the inorganic EL element by combining the voltages supplied to the transparent electrodes 12, 22, 32 and the transparent electrodes 15, 25, 35. .

Next, a charge injection type EL (organic EL) will be described.
The charge injection type EL is a structure in which a direct current voltage is applied to a semiconductor thin film, holes and electrons are injected from the electrodes on both sides of the semiconductor thin film, and light is emitted, and light is emitted by a mechanism similar to a light emitting diode (LED). To do. An organic single crystal such as anthracene has been studied as a semiconductor thin film, but in recent years, a high-luminance light emitting element using the organic thin film has been found. Thus, EL using an organic thin film is called organic EL.
Organic EL also has the advantages (a) to (f) above.
FIG. 2 is an explanatory diagram illustrating an example of an organic electroluminescence element (organic EL element).
This organic EL element includes a plastic substrate 51, a transparent electrode 52 laminated on the plastic substrate 51, a hole transport layer 53 laminated on the transparent electrode 52, and a light emission formed on the hole transport layer 53. It has a layer 54, an electron transport layer 55 stacked on the light emitting layer 54, and a back electrode 56 stacked on the electron transport layer 55.
The transparent electrode 52 is connected to the anode (positive electrode) of the DC power supply 59, and the back electrode 56 is connected to the cathode (negative electrode) of the DC power supply 59.
A transparent electrode 52 such as an ITO electrode is formed on a plastic substrate 51, a hole transport layer 53 that facilitates the flow of holes and an electron transport layer 55 that facilitates the flow of electrons are sequentially formed, and a back electrode 56 such as an MgAg alloy is formed. .
The hole transport layer (hole injection transport layer) 53 receives and transports hole injection from the anode, and the electron transport layer (electron injection transport layer) 53 receives and transports electron injection from the cathode.
When a positive electrode is connected to the transparent electrode 52 and a cathode is connected to the back electrode 56 to supply a DC voltage, holes flowing from the transparent electrode 52 to the hole transport layer 53 and electrons flowing from the back electrode 56 to the electron transport layer 55 are supplied. Are recombined in the light emitting layer 54 between the hole transport layer 53 and the electron transport layer 55 to emit light.
The plastic substrate 51 is configured to transmit visible light emitted from the light emitting layer 54, and the visible light can be seen through the plastic substrate 51.

The organic EL element can be driven by a DC voltage and can be operated at a low voltage of 10 V or less.
As an EL element to be mounted on a non-contact type IC card, an organic EL element that operates at a low driving voltage is preferable for the purpose of receiving power from an external device, but an inorganic EL element should also be mounted by using a converter or the like. Is possible.
In FIG. 1 and FIG. 2, a transparent plastic substrate such as polyethylene terephthalate (PET) is used, but a glass substrate can be used instead of the plastic substrate, and it is bent when mounted on a thin IC card. Plastic is preferred because it is strong and flexible. Note that even a glass substrate can be mounted on an IC card by devising the size, mounting method, and the like. For example, the organic EL element can have a current consumption of about 2.3 mA / cm ² .
Also in the organic EL, it is possible to increase the number of colors by adopting the configuration as shown in FIGS.

The multi-color organic EL element shown in FIG. 3A has a configuration in which organic EL elements that emit red, green, and blue light are arranged and combined.
In the multicolor organic EL element of FIG. 3A, a plastic substrate 61, a transparent substrate 62 laminated on the plastic substrate 61, and hole transport layers 63R, 63G, 63B formed on the transparent substrate 62, , Light emitting layers 64R, 64G, 64B, electron transport layers 65R, 65G, 65B, and back electrodes 66R, 66G, 66B.
A light emitting layer 64R that emits red (R) light is formed between the hole transport layer 63R and the electron transport layer 65R, and a back electrode 66R is formed on the electron transport layer 65R.
A light emitting layer 64G that emits green (G) light is formed between the hole transport layer 63G and the electron transport layer 65G, and a back electrode 66G is formed to overlap the electron transport layer 65G.
A light emitting layer 64B that emits blue (B) light is formed between the hole transport layer 63B and the electron transport layer 65B, and a back electrode 66B is formed on the electron transport layer 65B so as to overlap.
Light emitted from the light emitting layers 64R, 64G, and 64B can be seen through the plastic substrate 61, and various colors can be generated using the three primary colors by combining drive voltages supplied to the back electrodes 66R, 66G, and 66B.

The multicolor organic EL element shown in FIG. 3B has a structure in which a light emitting layer that emits white light and red, green, and blue color filters are combined and combined.
The multicolor organic EL element shown in FIG. 3B includes a plastic substrate 71, color filters 77R, 77G, and 77B formed on the plastic substrate 71, and transparent layers formed on the color filters 77R, 77G, and 77B, respectively. The electrodes 72R, 72G, 72B, the hole transport layer 73 formed on the transparent electrodes 72R, 72G, 72B, the light emitting layer 74 that emits white light, the electron transport layer 75, and the back electrodes 76R, 76G, 76B. Have
A red color filter 77R is positioned between the transparent electrode 72R and the plastic substrate 71.
Between the transparent electrode 72G and the plastic substrate 71, a green color filter 77G is located.
A blue color filter 77B is located between the transparent electrode 72B and the plastic substrate 71.
Between the transparent electrode 72R and the back electrode 76R, between the transparent electrode 72G and the back electrode 76G, and between the transparent electrode 72B and the back electrode 76B, the hole transport layer 73, the light emitting layer 74, and the electron transport. Layer 75 is formed.
The light emitted from the light emitting layer 74 can be seen through the plastic substrate 71, and the power supply to the organic EL element is changed by combining the driving voltages supplied to the transparent electrodes 72R, 72G, 72B and the back electrodes 76R, 76G, 76B. By doing so, various colors can be generated using the three primary colors.

The multicolor organic EL element in FIG. 3C has a structure in which a light emitting layer emitting blue light and a red, green, and blue color conversion layer are combined and combined.
3C is formed on the plastic substrate 81, the color conversion layers 87R, 87G, and 87B formed on the plastic substrate 81, and the color conversion layers 87R, 87G, and 87B, respectively. Transparent electrodes 82R, 82G, and 82B, a hole transport layer 83 formed on the transparent electrodes 82R, 82G, and 82B, a light emitting layer 84 that emits blue light, an electron transport layer 85, and back electrodes 86R, 86G, 86B.
A red color conversion layer 87R is located between the transparent electrode 82R and the plastic substrate 81.
A green color conversion layer 87G is positioned between the transparent electrode 82G and the plastic substrate 81.
A blue color conversion layer 87B is positioned between the transparent electrode 82B and the plastic substrate 81.
Between the transparent electrode 82R and the back electrode 86R, between the transparent electrode 82G and the back electrode 86G, and between the transparent electrode 82B and the back electrode 86B, the hole transport layer 83, the light emitting layer 84, and the electron transport. Layer 85 is formed.
The light emitted from the light emitting layer 84 can be seen through the plastic substrate 81, and various colors are generated using the three primary colors by combining the driving voltages supplied to the transparent electrodes 82R, 82G, and 82B and the back electrodes 86R, 86G, and 86B. can do.

Hereinafter, an example of an IC card having an inorganic EL element will be described.
A coil (antenna coil) in the IC card receives transmission power from an external device by magnetic coupling or electromagnetic induction.
The AC electrical signal generated at both ends of the coil is input to the rectifier circuit and converted into a DC electrical signal. A smoothing capacitor may be connected to the output terminal of the rectifier circuit. As an example, the rectifier circuit is configured by a bridge circuit using a diode.
The output of the rectifier circuit is input to a constant voltage circuit (regulator), and a stabilized DC voltage (drive voltage) for driving an IC that drives an IC (semiconductor integrated circuit) in the IC card is generated. A smoothing capacitor may be connected to the output terminal of the constant voltage circuit.

Examples of the method for driving the inorganic EL element include the following (a) to (c).
(A) The output of the coil is used.
FIG. 4A is a schematic block diagram showing an example of an IC card according to the present invention, and relates to the above (a).
The IC card 200 includes a semiconductor integrated circuit (IC) 140, first and second coils 111 and 112 that convert magnetic signals from a reader / writer (not shown) into electrical signals, and outputs of the first coil 110. A rectifier circuit 120 that rectifies the voltage, a constant voltage circuit (regulator) 130 that generates a drive voltage of the semiconductor integrated circuit 140 from an output voltage of the rectifier circuit 120, and an output voltage of the second coil 112. And an inorganic electroluminescence element (inorganic EL element) 150 that emits visible light.
Further, the IC card 200 has a smoothing capacitor C1 connected to the output terminal of the rectifier circuit 120 and a smoothing capacitor C2 connected to the output terminal of the constant voltage circuit 130.
Since the inorganic EL element 150 is driven by an alternating voltage, the inorganic EL element 150 is driven by the alternating voltage generated at the coil terminal of the IC card 200. However, the operating voltage of the IC 140 is about several volts, and an AC high voltage of about 100 to 300 V is required as an example to drive the inorganic EL element 150. Therefore, the number of turns is larger than that of the first coil 111, and A second coil 112 having a ratio greater than 1 is used.
In the IC card 200, one coil 115 is provided with three terminals, so that one terminal is shared and substantially used as two coils 111 and 112.

The advantage of the IC card 200 is that a semiconductor integrated circuit for driving the inorganic EL element 150 can be eliminated. Therefore, an existing semiconductor integrated circuit can be used for the IC card 200, and the cost of the IC card 200 can be reduced.
In the IC card 200, since the output voltage of the second coil 112 becomes the drive voltage of the inorganic EL element 150, the drive voltage of the inorganic EL element 150 depends on the communication distance between the IC card 200 and the external device, that is, the power reception state of the IC card 120. Changes.
For this reason, the light emission luminance of the inorganic EL element 150 changes depending on the distance between the IC card 200 and the external device.
In the IC card 200, in order to drive the inorganic EL element 150, it is necessary to receive a high voltage from the reader / writer. For this reason, as the carrier frequency (carrier frequency) of the IC card 200, a frequency of about 100 kHz to hundreds of tens kHz is suitable. This is because the output of the reader / writer can be increased at lower frequencies due to regulations of the Radio Law.
When the second coil 112 for driving the inorganic EL element 150 is compared with a coil wound with a wire (wired coil) and a coil etched with a metal foil such as copper foil or aluminum foil (printed coil) Although depending on the diameter of the wire and the thickness of the foil, in general, the wired coil is preferable because the Q value indicating the high power receiving efficiency is large.

(B) Use the output of the transformer.
FIG. 4B is a schematic block diagram showing an example of an IC card according to the present invention, and is related to the above (b).
The IC card 300 includes a semiconductor integrated circuit (IC) 140, a coil 110 that converts a magnetic signal from a reader / writer (not shown) into an electric signal, a rectifier circuit 120 that rectifies the output voltage of the coil 110, and the rectifier. A constant voltage circuit 130 that generates a drive voltage of the semiconductor integrated circuit 140 from an output voltage of the circuit 120, a transformer 180 that receives and transforms the output voltage of the coil 110, and an output voltage of the transformer 180. And an inorganic EL element 150 that emits visible light.
The IC card 300 also has a smoothing capacitor C1 connected to the output terminal of the rectifier circuit 120 and a smoothing capacitor C2 connected to the output terminal of the constant voltage circuit 130.
When it is difficult to take out a high voltage for driving the inorganic EL element 150 from the coil 112 in the IC card 200 described above, the IC card 300 is configured to have a high voltage using the transformer 180 from the coil output voltage. It is possible to generate a voltage.
In the IC card 300, since the output voltage of the transformer 180 becomes the drive voltage of the inorganic EL element 150, the drive voltage of the inorganic EL element 150 varies depending on the communication distance between the IC card 300 and the external device, that is, the power reception state of the IC card 300. To do.
For this reason, the light emission luminance of the inorganic EL element 150 changes depending on the distance between the IC card 300 and the external device.

(C) Use the output of the converter.
FIG. 5A is a schematic block diagram showing an example of an IC card according to the present invention, and is related to the above (c).
In this IC card 400, a semiconductor integrated circuit (IC) 140, a coil 110 that converts a magnetic signal from a reader / writer (not shown) into an electric signal, a rectifier circuit 120 that rectifies the output voltage of the coil 110, and the rectifier A constant voltage circuit 130 that generates a drive voltage of the semiconductor integrated circuit 140 from an output voltage of the circuit 120, a converter 160 that generates an AC voltage or a switching voltage from the output voltage of the constant voltage circuit 130, and an output voltage of the converter 160 And an inorganic EL element 150 that emits visible light when excited by.
The IC card 400 includes a smoothing capacitor C1 connected to the output terminal of the rectifier circuit 120 and a smoothing capacitor C2 connected to the output terminal of the constant voltage circuit 130. The converter 160 is an example of a drive circuit that drives the inorganic EL element 150.
In FIG. 5A, the direct current output of the constant voltage circuit 130 is supplied to the converter 160, and the inorganic EL element 150 is driven by the output of the converter 160.
Advantages of the IC card 400 are that the drive voltage of the inorganic EL element 150 can be stabilized, and the light emission luminance of the inorganic EL element 150 can be made constant as compared with the IC cards 200 and 300. .

Examples of a method for controlling the inorganic EL element include the following (d) and (e).
(D) Control using a voltage detection circuit.
In the IC cards 200 to 400, when the IC card receives power, the inorganic EL element 150 is driven by the output of the coil 112, the transformer 180, or the converter 160.
However, the light emission of the inorganic EL element 150 does not necessarily mean that the IC 140 can be driven.
When the input voltage of the inorganic EL element 150 reaches the voltage at which the inorganic EL element 150 can emit light (light emission possible voltage) but the input voltage of the IC 140 does not reach the predetermined voltage (predetermined value) at which the IC 140 can operate, Although the IC 140 cannot be driven, the inorganic EL element 150 can emit light.
On the other hand, if the input voltage of the inorganic EL element 150 does not reach the light-emissible voltage even if the input voltage of the IC 140 reaches the predetermined voltage (predetermined value), the inorganic EL element can be driven even though the IC 140 can be driven. Element 150 is not driven. These situations are undesirable for card users.
A method for solving this will be described below.

When driving the IC 140, a voltage detection circuit that detects that the output voltage of the power supply circuit has reached the predetermined value and generates a detection signal is provided, and after the output voltage of the power supply circuit reaches the predetermined value, the IC Control is performed by supplying power to a demodulation circuit, a transmission circuit, a central processing unit (CPU), a memory, and the like in the card. In the IC cards 200 to 400, a voltage detection circuit may be included in the IC 140.
In the IC cards 200 to 400, between the inorganic EL element 150 and the second coil 112, between the inorganic EL element 150 and the transformer 180, the inorganic EL element 150 and the converter 160, or the constant voltage circuit 130 and the converter 160. Is provided with a switch circuit such as a semiconductor switch, and the switch circuit is turned on (ON) when the drive voltage of the IC 140 reaches the predetermined value using the detection signal output from the voltage detection circuit as a control signal. If not, the switch circuit is turned off.
Here, FIG. 5B is a schematic block diagram showing an example of an IC card according to the present invention, which is related to the above (d).
This IC card 500 includes a voltage detection circuit 141 that detects that the output voltage of the constant voltage circuit 130 has reached a predetermined voltage at which the IC 140 can operate, and generates a detection signal. The converter 160 and the constant voltage circuit 130 And a switch circuit SW that is controlled by the detection signal. Further, the detection signal is supplied to the IC 140. Other configurations are the same as those of the IC card 400, and description of the other configurations is omitted.
As described above, by controlling the on / off of the switch circuit SW, the inorganic EL element 150 can be configured to emit light when the IC 140 can be driven, and the card user can determine whether the IC 140 is driven. It is possible to know whether or not the inorganic EL element 150 emits light.

In FIG. 5B, the output signal of the voltage detection circuit 141 is the on / off control signal of the switch circuit SW and then the inorganic EL element 150. However, another on / off control circuit for the inorganic EL element 150 is provided. The inorganic EL element 150 may be turned on / off by another signal.
For example, in a system that collates identification data (such as a unique number or a password) stored in a memory in an IC card by communication with an external device, when the collation result indicates a match, the inorganic EL element emits light, The card user can know from the light emission of the inorganic EL element that the matching result matches from the appearance of the IC card.
Furthermore, you may make it notify a card user using the display of the display apparatus by the side of an external apparatus, or the sound of an audio device.
In this case, the IC card 500 may have a configuration in which a memory for storing identification data in advance is provided, a verification circuit is connected instead of the voltage detection circuit 141, and a signal can be transmitted and received between the verification circuit and the IC 140. .
The memory may be provided in the IC 140, may be provided in the verification circuit, and the verification circuit may be provided in the IC 140.
The collation circuit collates the identification data stored in the memory and the identification data sent from the reader / writer to generate a collation signal according to the collation result, and uses the collation signal as a control signal for the switch circuit SW And
When the inorganic EL element 150 emits light according to the output voltage of the second coil 112, a switch circuit SW is provided between the second coil 112 and the inorganic EL element 150, and a control signal of the switch circuit SW May be used as the verification signal.
When the inorganic EL element 150 emits light according to the output voltage of the transformer 180, a switch circuit SW is provided between the transformer 180 and the inorganic EL element 150, and the control signal of the switch circuit SW is used as the verification signal. It is good.
When the inorganic EL element 150 emits light according to the output voltage of the transformer 180, a switch circuit SW is provided between the transformer 180 and the inorganic EL element 150, and the control signal of the switch circuit SW is used as the verification signal. It is good.
A switch circuit SW may be provided between the converter 160 and the inorganic EL element 150, and a control signal of the switch circuit SW may be used as the verification signal. However, in order to reduce power consumption, the converter 160 and the constant voltage circuit 130 may be reduced. A switch circuit is preferably provided.

On the other hand, in a system capable of simultaneously communicating with a plurality of IC cards with one external device, a collision prevention (anti-collision) circuit for preventing communication collision is provided in the IC card, and only a specific IC card is obtained by this anti-collision processing. To enable data communication.
As a result of the anti-collision process, when the IC card is selected, the inorganic EL element is caused to emit light, and when the IC card is not selected, the card user selects which IC card is selected. Alternatively, it is possible to know whether or not the IC card is selected by turning on / off the inorganic EL element.
In this case, the IC card 500 may have a configuration in which a collision prevention circuit is connected instead of the voltage detection circuit 141, and a configuration in which signals can be transmitted and received between the collision prevention circuit and the IC 140.
The collision prevention circuit detects that the own IC card is selected by the reader / writer, generates a selection detection signal, enables the own IC card to communicate with the reader / writer, and selects other ICs that are not selected. Prevent collision with the card. The control signal of the switch circuit SW is used as the selection detection signal.
The collision prevention circuit may be provided in the IC 140.
When the inorganic EL element 150 emits light according to the output voltage of the second coil 112, a switch circuit SW is provided between the second coil 112 and the inorganic EL element 150, and a control signal of the switch circuit SW May be the selection detection signal.
When the inorganic EL element 150 emits light according to the output voltage of the transformer 180, a switch circuit SW is provided between the transformer 180 and the inorganic EL element 150, and the control signal of the switch circuit SW is selected and detected. It may be a signal.
A switch circuit SW may be provided between the converter 160 and the inorganic EL element 150, and a control signal of the switch circuit SW may be used as the selection detection signal. However, in order to reduce power consumption, the converter 160 and the constant voltage circuit 130 may be reduced. A switch circuit SW is preferably provided.

In the IC card according to the present invention, the inorganic EL element 150 is controlled to be turned on / off by controlling the inorganic EL element 150. However, in order to reduce the power consumption of the inorganic EL element 150, the lighting is not continued. You may blink.
FIG. 8A is a waveform diagram of a voltage supplied to the inorganic EL element when the inorganic EL element is turned on and blinked.
At this time, the inorganic EL element can be blinked by providing a clock signal generation circuit in the IC card and periodically turning on / off the clock signal every 100 ms to turn on / off the switch circuit. Thereby, the power consumption of the inorganic EL element can be reduced, and the communication distance between the IC card and the external device can be increased.
For example, the output signal of the voltage detection circuit, the collision prevention circuit, or the verification circuit may be modulated with a clock signal to be a control signal for the switch circuit.
The clock signal may be generated directly from the AC voltage from the coils 110, 111, 112 or 115. FIG. 8B is an explanatory diagram illustrating an example of the clock signal generation circuit.
The frequency of the magnetic signal output from a reader / writer (not shown) is a natural number multiple of the frequency of the clock signal. The coil 110 converts the magnetic signal into an electric signal to generate an alternating voltage.
The clock signal generation circuit 170 includes an extraction circuit 171 that extracts a signal having a frequency of a magnetic signal from the output voltage of the coil 110, and a frequency dividing circuit 172 that divides the output signal of the extraction circuit 171.
By generating a clock signal from the output voltage of the coil 110, the clock signal generation circuit has a simple configuration, and the output signal of the extraction circuit 171 may be used as a clock signal, or a clock signal having an appropriate frequency is generated by a frequency dividing circuit. Alternatively, the inorganic EL element can be blinked using this clock signal.
Further, the duty factor (on / off ratio) of the blinking of the clock signal or the inorganic EL element may be 1/2 (on time: off time = 1: 1) or 1/8 (on time: off time = The power consumption of the inorganic EL element may be reduced by reducing the on-time ratio as in 1: 8).

(E) The inorganic EL element is turned on and off separately.
In (d) above, the output signal of the voltage detection circuit 141, the collation circuit or the collision prevention circuit is used for on / off control of the inorganic EL element 150, but the on / off of the inorganic EL element 150 is controlled by one output signal. There is no need, and on and off may be controlled by separate output signals.
6A is a schematic block diagram showing an example of an IC card according to the present invention. As shown in FIG. 6A, an RS flip-flop (RS-FF) circuit which is an example of a latch circuit is used. Alternatively, the output may be controlled to be turned on by the output of the collision prevention circuit 143 and turned off by the output of the collation circuit 142.
This IC card 600 connects the collision prevention circuit 143 and the collation circuit 142 in place of the voltage detection circuit 141 in the IC card 500, and supplies the output signals of the collision prevention circuit 143 and the collation circuit 142 to the RS-FF circuit 144. The configuration is such that the output signal of the RS-FF circuit 144 is a control signal for the switch circuit SW, and the IC 140, the collision prevention circuit 143, and the verification circuit 142 can transmit and receive signals.
The RS-FF circuit 144 changes to the first state by the selection detection signal output from the collision prevention circuit 143, changes to the second state by the verification signal output from the verification circuit 142, and the RS-FF circuit 144. Generates an output signal corresponding to the state. Other configurations are the same as those of the IC card 500, and description of the other configurations is omitted.
In this case, when the IC card 600 is selected by the collision prevention circuit 143, the IC card 600 turns on the switch circuit SW to cause the inorganic EL element 150 to emit light, and then performs data verification in the IC card 600. When the identification data matches, it is possible to turn off the inorganic EL element 150 by turning off the switch circuit SW.
The card user can know that the IC card 600 is in a selected state when the inorganic EL element 150 is turned on, and can know that the result of data collation is coincident when the inorganic EL element 150 is turned off.

On the other hand, in a system that terminates card processing when the data collation results in a match, the card user may remove the operation of holding the IC card 600 over the external device by turning off the inorganic EL element 150. It can be judged.
This is desirable in a system in which one external device can communicate with a plurality of IC cards. This is because when a plurality of IC cards are held over one external device in a conventional system, the display device on the external device side uses an IC card unique number or identification data to identify the IC card. The card user can only know the operating status of the IC card by looking at the unique number on the display screen, but it takes time.
However, in the IC card 600, the operation status of the IC card 600 can be easily known from the display state of the inorganic EL element 150.
In the IC card 600, the configuration in which ON and OFF are controlled separately is illustrated, but output signals for controlling ON and OFF can be freely combined depending on the system to be operated.
When the inorganic EL element 150 emits light according to the output voltage of the second coil 112, a switch circuit SW is provided between the second coil 112 and the inorganic EL element 150, and a control signal of the switch circuit SW is transmitted to the RS The output signal of the FF circuit 144 may be used.
When the inorganic EL element 150 emits light according to the output voltage of the transformer 180, a switch circuit SW is provided between the transformer 180 and the inorganic EL element 150, and a control signal of the switch circuit SW is used as the RS-FF circuit. 144 may be an output signal.
A switch circuit SW may be provided between the converter 160 and the inorganic EL element 150, and a control signal of the switch circuit SW may be used as an output signal of the RS-FF circuit 144. However, in order to reduce power consumption, the converter 160 and the constant voltage circuit Preferably, a switch circuit SW is provided between the switch 130 and the switch 130.

(F) A plurality of inorganic EL elements are controlled separately.
In the IC cards 200 to 600, the case where one inorganic EL element 150 is mounted in the IC card has been described, but a plurality of inorganic EL elements may be mounted.
FIG. 6B is a schematic block diagram showing an example of an IC card according to the present invention. As shown in FIG. 6B, two inorganic EL elements 151 and 152 are mounted on the IC card, and voltage is applied. The switch circuit SW1 is turned on / off by the output of the detection circuit 141 to turn on / off the inorganic EL element 151, and the switch circuit SW2 is turned on / off by the output of the verification circuit 142 to turn on / off the inorganic EL element 152. Let
In the IC card 700, when the IC 140 is operable by the output of the voltage detection circuit 141, the inorganic EL element 151 is caused to emit light. After that, the collation circuit 142 performs collation to identify the inorganic EL element 152 when the identification data matches. Make it emit light.
Thereby, the card user can know from the light emission of the inorganic EL element 151 that the IC 140 is operable and the IC card 700 is communicable when the IC card 700 is brought close to the external device. It can be known from the light emission of the inorganic EL element 152 that the results of FIG.
The IC card 700 has a configuration in which a plurality of inorganic EL elements, switch circuits, and converters are provided, and a collation circuit 142 is provided in the IC card 500, and the first switch circuit SW1 is controlled by a detection signal from the voltage detection circuit 141. Thus, the light emission of the inorganic EL element 151 is controlled, and the second switch circuit SW2 is controlled by the collation signal from the collation circuit 142 to control the light emission of the inorganic EL element 152.
The first switch circuit SW1 is provided between the converter 161 and the constant voltage circuit 130, and the second switch circuit SW2 is provided between the converter 162 and the constant voltage circuit 130. The verification circuit 142, the voltage detection circuit 141, and the IC 140 can transmit and receive signals.
When the inorganic EL elements 151 and 152 emit light according to the output voltage of the second coil 112, a switch circuit SW1 is provided between the second coil 112 and the inorganic EL element 151, and the second coil 112 and the inorganic coil A switch circuit SW2 may be provided between the EL element 152 and the EL element 152.
In the case where the inorganic EL elements 151 and 152 emit light according to the output voltage of the transformer 180, a switch circuit SW1 is provided between the transformer 180 and the inorganic EL element 151, and between the transformer 180 and the inorganic EL element 152. May be provided with a switch circuit SW2.
The switch circuit SW1 may be provided between the converter 161 and the inorganic EL element 151, and the switch circuit SW2 may be provided between the converter 162 and the inorganic EL element 152. However, in order to reduce power consumption, the converter 161 and the constant voltage circuit 130 are connected. The switch circuit SW1 is preferably provided, and the switch circuit SW2 is preferably provided between the converter 162 and the constant voltage circuit 130.

In the IC card 700, both the inorganic EL elements 151 and 152 may be controlled by a verification signal output from the verification circuit 142.
For example, the switch circuit SW1 is controlled to be turned on when the collation result in the collation circuit 142 indicates coincidence to cause the inorganic EL element 151 to emit light, and the switch circuit SW2 is turned on when the data collation result indicates inconsistency. The inorganic EL element 152 is caused to emit light by controlling.
In this case, the card user can know the collation result of the collation circuit 142 according to which inorganic EL elements 151 and 152 emit light, and can know the operation status of the IC card 700 in more detail.

Further, the above (d) and (e) may be combined, and the IC card 500 and the IC card 600 may be combined.
For example, in the IC card 600, the inorganic EL element 150 is the second inorganic EL element 152, the switch circuit SW is the second switch circuit SW2, and the switch circuit SW2 is controlled by the output signal of the RS-FF circuit 144. Further, a voltage detection circuit 141, a first inorganic EL element 151, and a converter 161 are provided, and a first switch circuit SW1 is provided between the converter 161 and the constant voltage circuit 130 to detect the voltage of the switch circuit SW1. Control is performed by a detection signal from the circuit 141.
As an example, the inorganic EL element 151 is controlled to turn on / off the switch circuit SW1 by the detection signal to control light emission / extinction of the inorganic EL element 151.
In addition, when the result of the collision prevention process of the collision prevention circuit 143 indicates selection and a selection detection signal is generated, the inorganic EL element 152 may be caused to emit light by controlling the switch circuit SW2 to be turned on.
In addition, when the result of data collation by the collation circuit 142 indicates coincidence, and a collation signal indicating this coincidence is generated, the switch circuit SW2 may be controlled to turn off the inorganic EL element 152.
Regarding the switch circuits SW1 and SW2, when the inorganic EL elements 151 and 152 emit light according to the output voltage of the second coil 112, the switch circuit SW1 is connected between the second coil 112 and the inorganic EL element 151. The switch circuit SW <b> 2 may be provided between the second coil 112 and the inorganic EL element 152.
For the switch circuits SW1 and SW2, when the inorganic EL elements 151 and 152 emit light according to the output voltage of the transformer 180, the switch circuit SW1 is provided between the transformer 180 and the inorganic EL element 151. A switch circuit SW2 may be provided between the transformer 180 and the inorganic EL element 152.
For the switch circuits SW1 and SW2, the switch circuit SW1 may be provided between the converter 161 and the inorganic EL element 151, and the switch circuit SW2 may be provided between the converter 162 and the inorganic EL element 152. In order to reduce electric power, it is preferable to provide a switch circuit SW1 between the converter 161 and the constant voltage circuit 130 and to provide a switch circuit SW2 between the converter 162 and the constant voltage circuit 130.

  The light emission colors of the inorganic EL elements 151 and 152 may be distinguished by the arrangement of the inorganic EL elements as the same color, but it is easier for the card user to determine which inorganic EL element is different from each other. More preferable.

(G) A multicolor inorganic EL element is controlled by changing the color.
In the above (f), a plurality of inorganic EL elements are used. However, the emission color may be changed using a multicolor inorganic EL element capable of developing a plurality of colors.
For the multi-color inorganic EL element, the multi-color inorganic EL element in FIG. 1B can be referred to, and the inorganic EL element can be changed in different colors by changing the power supply to the inorganic EL element. It is possible to emit light.

The inorganic EL elements described in the above (a) to (g) can be provided in an IC card as a panel that emits surface light. The inorganic EL element can obtain a wide light emitting surface, which is convenient for the card user to immediately know the operation status of the IC card.
In an IC card, it is possible to display more detailed information such as data stored in a memory in the IC card by mounting an EL element that enables segment display or dot display.

(H) Display numbers etc. by segment display.
FIG. 7A is a schematic block diagram of a display element for segment display and its driving circuit. The segment of the display element is composed of inorganic EL elements 150a to 150g, and the inorganic EL elements 150a to 150g are driven by a drive circuit 165 to emit visible light. The display element and the drive circuit may be provided in the IC card according to the present invention.
The drive circuit 165 inputs a control signal from a microcomputer (not shown) in the IC card, and the segment display can be controlled by the microcomputer. This microcomputer may be provided in the IC 140.
As an example, the drive circuit 165 includes a converter, a decoder that specifies an inorganic EL element that emits light from the control signal, and switch circuits SWa to SWg provided between the converter and the inorganic EL elements 150a to 150g. The switch circuit connected to the inorganic EL element specified by the decoder among the switch circuits SWa to SWg is controlled to be turned on.
In this way, it is possible to display the amount of money, frequency, etc. for prepaid applications using a segment type display element made of an inorganic EL element, and also in communication information with the reader / writer or a memory in an IC card. The stored memory information can be displayed.

(I) Display characters by dot display.
FIG. 7B is a schematic block diagram of a display element that performs dot display and its drive circuit. The dots of the display element are composed of inorganic EL elements 150 _{11 to} 150 _MN arranged in a matrix. FIG. 7B illustrates a case where M = 7 and N = 16.
The inorganic EL elements 150 _{11 to} 150 _MN are driven by the drive circuit 166 and emit visible light. The drive circuit 166 inputs a control signal from a microcomputer (not shown) in the IC card, and the dot display can be controlled by the microcomputer. This microcomputer may be provided in the IC 140. The display element and the drive circuit 166 may be provided in the IC card according to the present invention.
N transparent electrodes from the drive circuit 166 are arranged corresponding to the inorganic EL elements in the column direction, and M back electrodes from the drive circuit 166 are arranged corresponding to the inorganic EL elements in the row direction.
As an example, the drive circuit 166 includes a converter 160, a first decoder that identifies a row-direction inorganic EL element that emits light from the control signal, and a second decoder that identifies a column-direction inorganic EL element that emits light from the control signal. First switch circuits SW1a to SW1g provided between the decoder and the converter and the inorganic EL element in the row direction, and second switch circuits SW2a to SW2a provided between the converter and the inorganic EL element in the column direction. A switch circuit connected to the row-direction inorganic EL element specified by the first decoder among the switch circuits SW1a to SW1g, and the switch circuit SW2g to SW2g. The switch circuit connected to the inorganic EL element in the column direction specified by the decoder 2 is turned on.
In this way, it is possible to display the amount of money, frequency, etc. for prepaid applications using a dot display element made of an inorganic EL element, and also in communication information with the reader / writer or in a memory in an IC card Stored stored information can be displayed, and characters (text) and images can be displayed.
Thereby, various information such as “OK”, “NG”, “PASS”, and “FAIL” can be displayed in dots.
Similarly to the dot type display element, a matrix type display element may be constituted by an inorganic EL element and provided in an IC card.

When information is displayed as in the above (h) to (i), it is necessary to control each segment or dot, which may increase the circuit scale and cost. In order to simplify this control, display characters such as “OK” and “NG” may be determined in advance and displayed.
In addition, an inorganic EL element that emits light over the entire surface of a certain region, and a negative character (color removal) is printed in advance on the inorganic EL element corresponding to the backlight, whereby the character is emitted when the inorganic EL element emits light. It is also possible to display the fixed information by the characters.

In the above embodiment, a non-contact IC card is assumed, but an EL element may be mounted on the contact IC card.
Many external devices of contact IC cards insert the entire IC card into the slot. However, some small (simple) reader / writers have a type in which a part of an IC card is inserted into a slot and the other part is exposed to the outside. Also, there may be an external device that is covered with a transparent casing and that allows the inserted IC card to be seen from the outside.
In such a case, by mounting the inorganic EL element on the contact IC card, the operation status of the IC card can be known from the appearance of the IC card in the same manner as the non-contact IC card.

FIG. 9A is a schematic block diagram showing an example of a contact IC card according to the present invention.
The contact IC card 950 is supplied to a connection terminal T1 to which a circuit voltage Vcc is supplied from a reader / writer (not shown), a semiconductor integrated circuit (IC) 140 using the circuit voltage Vcc as a drive voltage, and the connection terminal T1. A converter 160 that generates an alternating voltage or a switching voltage from the circuit voltage Vcc, an inorganic EL element 150 that emits visible light according to the output voltage of the converter 160, and connection terminals T2, T3, T5 to T7, Have
The inorganic EL element 150 emits light when the circuit voltage Vcc is supplied from the reader / writer.
The connection terminal T5 is connected to the IC 140 and the converter 160.
The connection terminals T2, T3, T7 are connected to the IC 140.
A circuit voltage Vcc is supplied to the connection terminal T1.
A reset signal RST is supplied to the connection terminal T2.
A clock signal CLK is supplied to the connection terminal T3.
A ground voltage (ground voltage) GND is supplied to the connection terminal T5.
The program supply voltage Vpp is supplied to the connection terminal T6.
Data is input to and output from the connection terminal T7, and input data or output data is supplied.
The contact IC card 950 has the simplest circuit configuration, and the circuit voltage Vcc is +5 V in the ISO standard.

Further, as shown in FIG. 9B, the output voltage of the converter 160 may be a drive voltage, and the light emission of the inorganic EL element 150 may be controlled from the IC.
The contact IC card 970 is supplied to a connection terminal T1 to which a circuit voltage Vcc is supplied from a reader / writer (not shown), a semiconductor integrated circuit (IC) 145 having the circuit voltage Vcc as a drive voltage, and the connection terminal T1. Converter 160 that generates an AC voltage or a switching voltage from the circuit voltage Vcc that is applied, an inorganic EL element 150 that emits visible light according to the output voltage of the converter 160, and between the converter 160 and the connection terminal T1 The switch circuit SW is provided in the IC 145, and the IC 145 generates a control signal for the switch circuit SW so that the on / off operation of the switch circuit SW can be controlled from the IC 145. A microcomputer may be provided in the IC 145.
The inorganic EL element 150 emits light when the circuit voltage Vcc is supplied from the reader / writer.
The connection terminal T5 is connected to the IC 145 and the inorganic EL element 150.
The connection terminals T2, T3, and T7 are connected to the IC 145.
A switch circuit SW may be provided between the converter 160 and the inorganic EL element 150.

Corresponding to the IC cards 500 to 700, a contact IC card having an inorganic EL element can be configured similarly.
In the IC cards 500 to 700, the coil 110, the rectifier circuit 120, the capacitor C1, and the constant voltage circuit 130 are removed, and the connection terminal T1 is adopted instead of the output terminal of the constant voltage circuit 130. The converter 160 is connected to the connection terminal T1. It is good also as a structure which inputs a terminal voltage. Further, the segment type display element of FIG. 7A and its drive circuit 165 may be provided, or the dot type display element of FIG. 7B and its drive circuit 166 may be provided.

Recently, there is an IC card called a combination card, a dual interface IC card or a 2-Way access card, which has both a contactless IC card interface and a contact IC card interface in one IC card. An EL element may be mounted on such an IC card.
FIG. 10 is a schematic block diagram showing an example of an IC card according to the present invention.
The IC card 980 includes a connection terminal T1 to which a circuit voltage is supplied from a reader / writer (not shown), a semiconductor integrated circuit (IC) 146 that inputs the circuit voltage as a drive voltage, a converter 160, and an output voltage of the converter 160. In response to the above, the inorganic EL element 150 that emits visible light, the switch circuit SW provided between the converter 160 and the connection terminal T1, and the coil 110 that converts a magnetic signal from a reader / writer (not shown) into an electric signal. A rectifier circuit 120 that converts the output voltage of the coil 110 from alternating current to direct current, a constant voltage circuit 130 that generates a driving voltage for the IC from the output voltage of the rectifier circuit 120, the constant voltage circuit 130, and the converter 160 is provided between the converter 160 and the connection terminal T1. And a switch circuit SW3 which, the switching circuit SW3, SW4 is controllable and the structure of the control signal on-off operation of the switching circuit SW by the IC146 is produced from the IC145 of. A microcomputer may be provided in the IC 146. A smoothing capacitor may be connected to the output terminal of the constant voltage circuit 130.
The converter 160 generates an AC voltage or a switching voltage from the circuit voltage supplied to the connection terminal T1 or the output voltage of the constant voltage circuit 130, and generates a drive voltage for the inorganic EL element 150.
The inorganic EL element 150 emits light when the circuit voltage Vcc is supplied from the reader / writer or when power is supplied by a magnetic signal from the reader / writer.
The connection terminal T5 is connected to the IC 146 and the converter 160.
The connection terminals T2, T3, T7 are connected to the IC 146.

The IC 146 inputs a power supply voltage generated from the output voltage of the coil 110 by the rectifier circuit 120 and the constant voltage circuit 130 or a power supply voltage supplied from the connection terminal T1 as a drive voltage.
The IC 146 includes a determination circuit that determines whether power is supplied via the coil 110 and when power is supplied via the connection terminal T1, and the switch circuit SW3 is switched according to the determination result. One of the switches SW4 is controlled to be on, and the converter 160 is operated to cause the inorganic EL element 150 to emit light.
When power is supplied from the reader / writer through the coil 110 and power is supplied through the connection terminal T1, one of the switch circuits SW3 and SW4 is controlled to be turned on. In this case, the switch circuit SW3 may be turned on.
Inorganic EL elements capable of emitting different colors may be mounted on the IC card 980, or a plurality of inorganic EL elements having different emission colors may be mounted on the IC card 980.
When the power is supplied from the reader / writer via the coil 110 and when the power is supplied via the connection terminal T1, the card user makes the power reception status inorganic by emitting light in different colors. It can be recognized from the emission color of the EL element.

FIG. 11 is a circuit diagram illustrating an example of a converter.
This converter includes a DC power supply V9, a capacitor C9 connected in parallel to the DC power supply V9, transistors Q1 to Q4, and diodes D1 to D4. Reverse diodes D1 to D4 are connected between the collectors and emitters of the transistors Q1 to Q4, respectively, to form a protection circuit against a spike voltage.
Transistors Q1 to Q4 form a bridge circuit, and an alternating voltage is applied to a load 155 such as an inorganic EL element by alternately turning on and off opposing transistors Q1 and Q3 and opposing transistors Q2 and Q4. can do.
When the transistors Q1 and Q3 and the transistors Q2 and Q4 are simply turned on / off alternately, the AC voltage applied to the load 155 is a rectangular wave, but the transistors Q1 to Q4 are turned on and off finely. By controlling, it is possible to apply a voltage close to a sine wave. Control signals SQ1 to SQ4 are supplied to the bases of the transistors Q1 to Q4. For example, the control signals SQ1 to SQ4 can be supplied from a microcomputer to control the operations of the transistor transistors Q1 to Q4.
A high voltage is generated from the DC output voltage of the rectifier circuit 120 or the constant voltage circuit 130 by a booster circuit (not shown), and the booster circuit is used as a DC power supply V9 in FIG.
The booster circuit can drive the inorganic EL element even when the output voltage of the rectifier circuit 120 or the constant voltage circuit 130 is small.
Thus, as converter 160, a DC / AC converter circuit (DC-AC converter or inverter) may be used, or a voltage converter circuit (DC-DC converter) that generates a switching voltage may be used.

Since the inorganic EL element can emit light in a wide range by surface emission, it is possible to prevent the light emitting portion from being hidden by a fingertip having an IC card. The size of the inorganic EL element mounted on the IC card is larger than the area where one finger, for example, the fingertip of the thumb or forefinger touches one side of the IC card when the IC card is picked up and held by the fingertip of one hand, for example. May be the light emitting area.
The above embodiment is an example of the present invention, and the present invention is not limited to the above embodiment.

It is explanatory drawing which illustrates and illustrates an inorganic electroluminescent element (inorganic EL element). It is explanatory drawing which illustrates and demonstrates an organic electroluminescent element (organic EL element). It is explanatory drawing which illustrates and illustrates a multicolor organic EL element. 1 is a schematic block diagram illustrating an IC card according to the present invention. 1 is a schematic block diagram illustrating an IC card according to the present invention. 1 is a schematic block diagram illustrating an IC card according to the present invention. It is a schematic block diagram which illustrates a display element and its drive circuit. It is explanatory drawing explaining the drive voltage waveform of the inorganic EL element in the case of making an inorganic EL element light and blinking, and the circuit which produces | generates the clock signal of a blink period. 1 is a schematic block diagram illustrating an IC card according to the present invention. 1 is a schematic block diagram illustrating an IC card according to the present invention. It is a circuit diagram which shows an example of a converter.

Explanation of symbols

1, 11, 51, 61, 71, 81 ... plastic substrate, 2, 12, 22, 32, 52, 62, 72R, 72G, 72B, 82R, 82G, 82B ... transparent electrode, 15, 25, 35 ... transparent electrode 3, 13, 21, 23, 31, 33 ... insulating layer, 4, 14, 24, 34 ... dielectric layer, 5, 56, 66R, 66G, 66B, 76R, 76G, 76B, 86R, 86G, 86B ... back surface Electrode, 9 ... AC power source, 53, 63R, 63G, 63B, 73, 83 ... Hole transport layer (hole injection transport layer), 54, 64R, 64G, 64B, 74, 84 ... Light emitting layer, 55, 65R, 65G, 65B, 75, 85 ... electron transport layer (electron injection transport layer), 59 ... DC power supply, 110, 115 ... coil, 111 ... coil (first coil), 112 ... coil (second coil), 120 ... Rectifier circuit, 30 ... constant voltage circuit, 140,145,146 ... semiconductor integrated circuit (IC), 141 ... voltage detection circuit, 142 ... matching circuit, 143 ... collision prevention circuit, 144 ... RS-FF circuit, 150,150A～150g, 0.99 _{11 to} 150 _MN , 151, 152 ... inorganic electroluminescence element (inorganic EL element), 155 ... load, 160 ... converter, 165, 166 ... drive circuit, 170 ... clock signal generation circuit, 171 ... extraction circuit, 172 ... frequency division Circuit, 180 ... transformer, 200, 300, 400, 500, 600, 700, 950, 970, 980 ... IC card, C1, C2, C3, C9 ... capacitor, D1-D4 ... diode, GND ... ground voltage (grounding) Voltage), Q1-Q4 ... transistor, SW ... switch circuit, SW1 ... switch circuit (first switch) Switch circuit), SW2... Switch circuit (second switch circuit), T1 to T3, T5 to T7... Connection terminal, V9.

Claims (5)

A connection terminal to which a circuit voltage is supplied from the reader / writer;
A semiconductor integrated circuit using the circuit voltage as a driving voltage;
A converter that generates an alternating voltage or a switching voltage from the circuit voltage supplied to the connection terminal;
A single or a plurality of inorganic electroluminescent elements that emit visible light when excited by the output voltage of the converter;
A switch circuit provided between the converter and the inorganic electroluminescence element or between the converter and the connection terminal;
The semiconductor integrated circuit generates an IC card that generates a control signal for turning on or off the switch circuit. The IC card has a display element for segmentally displaying communication information with the reader / writer or storage information stored in a memory in the IC card,
The IC card according to claim 1, wherein each segment is configured by the inorganic electroluminescence element. The IC card has a display element that displays dots of communication information with the reader / writer or stored information stored in a memory in the IC card,
The IC card according to claim 1, wherein each dot is configured by the inorganic electroluminescence element. The IC card has a display element that displays a matrix display of communication information with the reader / writer or stored information stored in a memory in the IC card,
The IC card according to claim 1, wherein the display element is configured by the inorganic electroluminescence element. The inorganic electroluminescence element is
A plastic substrate,
A transparent electrode formed on the plastic substrate;
A back electrode;
An insulating layer and a dielectric layer formed between the back electrode and the transparent electrode,
The IC card according to claim 1, wherein the dielectric layer that emits visible light is sandwiched between the back electrode and the transparent electrode via the insulating layer.

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