JP2000194811A - Ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IC card capable of recognizing the operation condition of the IC card from the appearance of the IC card. SOLUTION: This IC card 400 is provided with a semiconductor integrated circuit(IC) 140, a coil 110 for converting magnetic signals from a reader-writer to electric signals, a rectifier circuit 120 for rectifying the output voltage of the coil 110, a constant voltage circuit 130 for generating the driving voltage of the IC 140 from the output voltage of the rectifier circuit 120, a converter 160 for generating an AC voltage or a switching voltage from the output voltage of the constant voltage circuit 130, an inorganic electroluminescence element (inorganic EL element) 150 for being excited by the output voltage of the converter 160 and emitting visible light and smoothing capacitors C1 and C2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an IC card for transmitting and receiving data to and from a reader / writer, and to an IC card having a light emitting element.

[0002]

2. Description of the Related Art The operation status of an IC card, for example, whether power is supplied to the IC card from an external device such as a reader / writer or the like is sometimes displayed on a display device of an external device (coupling device). For example, a light emitting diode (L
A display device such as an ED) or a liquid crystal (LCD) is provided, and the external device determines that the IC card is operating, for example, communicating with the IC card, and displays the operating status of the IC card on the display device. As a display method, for example, there is a method of turning on or blinking an LED according to the operation status of the IC card, or changing the color of the lighting or blinking to green, red, or the like according to the operation status of the IC card. In addition, there is a method of displaying characters indicating the operation status of an 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 IC card having an LED for optical communication. In this method, communication between an IC card and an external device is performed by infrared communication, similarly to an infrared remote controller.

[0003]

It is difficult for a user of an IC card (card user) to know the operation status of the IC card from the external appearance of the IC card, especially the non-contact type IC card. Therefore, it is necessary to bring the IC card close to the external device and see the display device on the external device side. When one external device can communicate with a plurality of IC cards simultaneously,
When notifying the operation status of the IC card to a plurality of card users individually, the display device uses an identification number (ID number).
Is displayed according to the operation status of the IC card. At this time,
The card user needs to identify his or her identification number from the displayed 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 perform infrared communication between the card and an external device.
It is not a display of the operating status of the C card. Also, infrared is not visible light. For this reason, the LED is small and it is difficult to distinguish between on and off. Also, in order to reduce the power consumption of the IC card, the LED is turned on during data communication,
During non-communication, the LED is turned off. Therefore, when processing other than data communication is being performed, the LED is in the light-off state, and it is difficult to know the operation status of the IC card. An object of the present invention is to provide an IC card capable of recognizing the operation status of the IC card from the external appearance of the IC card.

[0005]

A first IC card according to the present invention has an inorganic electroluminescent element which emits visible light when excited by an externally supplied voltage.

A second IC card according to the present invention has a coil for converting a magnetic signal from a reader / writer into an electric signal, and an inorganic electroluminescent element which emits visible light when excited by an output voltage of the coil.

A third IC card according to the present invention is a semiconductor integrated circuit, a coil for converting a magnetic signal from a reader / writer into an electric signal, a rectifying circuit for rectifying an output voltage of the coil, and an output of the rectifying circuit. A constant voltage circuit that generates a drive voltage for the semiconductor integrated circuit from a voltage; a converter that generates an AC voltage or a switching voltage from an output voltage of the constant voltage circuit; and a light source that emits visible light when excited by the output voltage of the converter. And an inorganic electroluminescent element.

A fourth IC card according to the present invention includes a connection terminal to which a circuit voltage is supplied from a reader / writer, a semiconductor integrated circuit that uses the circuit voltage as a drive voltage, and a circuit voltage that is supplied to the connection terminal. And a converter that generates an AC voltage or a switching voltage from the converter, and a single or a plurality of inorganic electroluminescent elements that emit visible light when excited by an output voltage of the converter.

The inorganic electroluminescence element can be reduced in size and thickness, and can have more flexibility than a liquid crystal display element using a liquid crystal. Also,
Surface light emission is performed, and light emission can be viewed not only from the front but also from an oblique direction. IC cards are thin and often bent, and card users often look at IC cards from oblique directions. For this reason, the inorganic electroluminescence element is suitable for an IC card, the inorganic electroluminescence element can be easily mounted on the IC card, and the card user can easily recognize the light emission of the inorganic electroluminescence element.

[0010]

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, and among them, there is an electroluminescent display material. This is a material that emits light when an electric field is applied to a fluorescent substance, that is, emits electroluminescence (EL). A light emitting display device utilizing this phenomenon is called an electroluminescent element.

EL is roughly classified into two types: intrinsic EL and charge injection type EL. First, an intrinsic EL (inorganic EL) will be described. The 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, and an alternating voltage is applied to apply an alternating electric field. A phosphor using zinc sulfide (ZnS) as a phosphor 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 for explaining 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, and a dielectric layer 4.
And an insulating layer 3 surrounding the dielectric layer 4 and a back electrode 5. The transparent electrode 2 and the back electrode 5 have an AC power supply 9.
Is connected. The transparent electrode 2 and the back electrode 5 sandwich the dielectric layer 4 with the insulating layer 3 interposed therebetween, and apply an AC voltage from an AC power supply 9 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 made 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 accelerated electrons pass through the dielectric layer 4 at a high speed. The phosphor (ie, impurity ions in the dielectric layer 4) emits light. Red, depending on the type of impurity ions
Light emission colors such as green and blue are different. The dielectric layer 4 becomes a light emitting layer,
The visible light emitted from the dielectric layer 4 is transmitted through the plastic substrate 1 so that the visible light can be seen through the plastic substrate 1. The inorganic EL element can be configured with a thickness of about 0.17 mm as an example.
The current consumption can be less than 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 even from an oblique direction. (D) There is no afterimage because of high-speed response. (E) High contrast and easy to see. (F) The volume is small and small. On the other hand, the drive circuit (driver) of the inorganic EL element needs to generate an AC voltage of about 100 V to 300 V as an example.

Since the dielectric layer of the inorganic EL element is transparent, it is possible to form a multicolor inorganic EL element by stacking three primary color EL thin films of red, green and blue. By controlling power supply to the inorganic EL element, a full-color display can be realized.
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 overlaid. This inorganic EL element includes a plastic substrate 11, insulating layers 21, 31, transparent electrodes 12, 22, 32, insulating layers 13, 23, 33, and dielectric layers 14, 24, 3 that emit light.
4 and transparent electrodes 15, 25 and 35. A transparent electrode 12 is laminated on a 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 coloring layer. The dielectric layer 34 wrapped in the insulating layer 33 forms a red coloring layer. An AC voltage from an AC power supply (not shown) is applied to the dielectric layer 14 with the dielectric layer 14 interposed between the transparent electrodes 12 and 15 via the insulating layer 13.
The dielectric layer 2 is formed by the transparent electrodes 22 and 25 via the insulating layer 23.
4, an AC voltage from an AC power supply (not shown) is applied to the dielectric layer 2.
4 is applied. 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 supply (not shown) is applied to the dielectric layer 34. Transparent electrodes 12, 22, 32 and transparent electrode 1
By changing the power supply to the inorganic EL element by combining the voltages supplied to 5, 25, and 35, various colors can be generated and viewed through the plastic substrate 11.

Next, a charge injection type EL (organic EL) will be described. The charge injection type EL has a configuration in which a DC voltage is applied to a semiconductor thin film, holes and electrons are injected from electrodes on both sides of the semiconductor thin film to emit light, and light is emitted by a mechanism similar to a light emitting diode (LED). I do. As a semiconductor thin film, an organic single crystal such as anthracene has been studied. In recent years, a high-luminance light-emitting element using an organic thin film has been found. An EL using an organic thin film is an organic EL
Called. Regarding the organic EL, the above (a) to (f)
There are advantages. FIG. 2 is an explanatory diagram illustrating an example of an organic electroluminescence element (organic EL element).
This organic EL device 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 hole transport layer 5.
3, a light emitting layer 54 formed on the light emitting layer 3, an electron transport layer 55 laminated on the light emitting layer 54, and a back electrode 56 laminated on the electron transport layer 55. DC power supply 5
Nine anodes (positive poles) are connected, and a back electrode 56 is connected to a negative pole (negative pole) of a 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, in which holes easily flow, and an electron transport layer 55, in which electrons easily flow, are sequentially formed. A back electrode 56 such as an MgAg alloy is formed. . The hole transport layer (hole injection / transport layer) 53 receives and transports holes from the anode, and the electron transport layer (electron injection / transport layer) 53 receives and transports electrons from the cathode. When a DC voltage is supplied by connecting an anode to the transparent electrode 52 and connecting a cathode to the back electrode 56, holes flowing from the transparent electrode 52 into the hole transport layer 53 and the back electrode 5
The electrons flowing from 6 into the electron transport layer 55 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 transmits visible light emitted from the light emitting layer 54, and the visible light can be seen through the plastic substrate 51.

The organic EL device can be driven by a DC voltage and can operate at a low voltage of 10 V or less. As the EL element mounted on the non-contact type IC card, an organic EL element which operates at a low driving voltage is preferable for the purpose of receiving power from an external device.
The element can be mounted by using a converter or the like. Although a transparent plastic substrate such as polyethylene terephthalate (PET) is used in FIGS. 1 and 2, a glass substrate can be used instead of the plastic substrate. Plastic is preferred because it is strong and flexible. Note that even a glass substrate can be mounted on an IC card by devising its size and mounting method. The organic EL element is, for example, 2.
A current consumption of about 3 mA / cm ² can be achieved. Also in the organic EL, it is possible to achieve multiple colors by adopting a configuration as shown in FIGS.

In the multicolor organic EL device shown in FIG.
In this configuration, organic EL elements that emit red, green, and blue light are arranged and combined. In the multicolor organic EL device shown in FIG.
A plastic substrate 61; a transparent substrate 62 laminated on the plastic substrate 61; hole transport layers 63R, 63G, 63B formed on the transparent substrate 62;
64G, 64B and electron transport layers 65R, 65G, 65B
And back electrodes 66R, 66G, and 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.
A back electrode 66R is formed overlapping 5R. 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 on the electron transport layer 65G so as to overlap.
Blue (B) between the hole transport layer 63B and the electron transport layer 65B
A light emitting layer 64B that emits a color is formed, 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, 64B can be seen through the plastic substrate 61, and the back electrode 6
Various colors can be generated using the three primary colors by combining drive voltages supplied to 6R, 66G, and 66B.

The multicolor organic EL device shown in FIG. 3B has a structure in which a light emitting layer that emits white light is combined with red, green, and blue color filters. The multicolor organic EL element shown in FIG. 3B includes a plastic substrate 71 and a color filter 77R formed on the plastic substrate 71.
77G, 77B and color filters 77R, 77G, 7
7B, the transparent electrodes 72R, 72G,
72B, a hole transport layer 73 formed on the transparent electrodes 72R, 72G, and 72B, and a light emitting layer 74 that emits white light.
It has an electron transport layer 75 and back electrodes 76R, 76G, 76B. A red color filter 77R is located between the transparent electrode 72R and the plastic substrate 71. A green color filter 77G is located between the transparent electrode 72G and the plastic substrate 71. Transparent electrode 72B
A blue color filter 77B is located between the color filter and the plastic substrate 71. Transparent electrode 72R and back electrode 7
6R, between the transparent electrode 72G and the back electrode 76G, and between the transparent electrode 72B and the back electrode 76B, a hole transport layer 73, a light emitting layer 74, and an electron transport layer 75 are formed. ing. Light emission from the light emitting layer 74 can be seen through the plastic substrate 71 and the transparent electrodes 72R, 72
By changing the power supply to the organic EL element by combining drive voltages supplied to the G and 72B and the back electrodes 76R, 76G and 76B, various colors can be generated using the three primary colors.

The multicolor organic EL device shown in FIG. 3C has a structure in which a light emitting layer that emits blue light and color conversion layers for red, green, and blue are combined and combined. The multicolor organic EL element shown in FIG. 3C includes a plastic substrate 81 and color conversion layers 87R, 87G, and 87B formed on the plastic substrate 81.
Transparent electrodes 82R, 82G, 82B formed on the color conversion layers 87R, 87G, 87B, respectively;
Hole transport layer 83 formed on 2R, 82G, 82B
A light emitting layer 84 that emits blue light, an electron transport layer 85,
It has back electrodes 86R, 86G, and 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 located between the transparent electrode 82G and the plastic substrate 81. A blue color conversion layer 87B is located between the transparent electrode 82B and the plastic substrate 81. Transparent electrode 82
R 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, between the hole transport layer 83, the light emitting layer 84, and the electron transport layer 85. Are formed. Light emission from the light emitting layer 84 can be seen through the plastic substrate 81, and the transparent electrodes 82R, 82G, 82B and the back electrodes 86R, 86G, 8
Various colors can be generated using the three primary colors by a combination of the driving voltages supplied to the first and second driving voltages.

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, electromagnetic induction, or the like. An AC electric signal generated at both ends of the coil is input to a rectifier circuit and converted into a DC electric signal. A smoothing capacitor may be connected to the output terminal of the rectifier circuit. The rectifier circuit is configured as a bridge circuit using a diode as an example. The output of the rectifier circuit is input to the constant voltage circuit (regulator) and the IC
A stabilized DC voltage (drive voltage) for driving an IC (semiconductor integrated circuit) in the 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). This IC
The card 200 includes a semiconductor integrated circuit (IC) 140, first and second coils 111 and 112 for converting a magnetic signal from a reader / writer (not shown) into an electric signal, and the first and second coils 111 and 112.
Rectifier circuit 120 for rectifying the output voltage of the coil 110
A constant voltage circuit (regulator) 130 for generating a drive voltage for the semiconductor integrated circuit 140 from the output voltage of the rectifier circuit 120; and an inorganic electroluminescent device that emits visible light when excited by the output voltage of the second coil 112. A luminescence element (inorganic EL element) 150. Further, the IC card 200 includes a smoothing capacitor C1 connected to the output terminal of the rectifier circuit 120 and a constant voltage circuit 13.
0, and a smoothing capacitor C2 connected to the output terminal. Since the inorganic EL element 150 is driven by an AC voltage, the inorganic EL element 150 is driven by an AC voltage generated at a coil terminal of the IC card 200. However, IC
The operating voltage of 140 is about several volts, and driving the inorganic EL element 150 requires, for example, an AC high voltage of about 100 to 300 V. Therefore, the number of turns is larger than that of the first coil 111, and the transformation ratio is higher. A second coil 112 larger than one is used. In the IC card 200, three terminals are provided for one coil 115, so that one terminal is shared and substantially used as two coils 111 and 112.

The advantage of this IC card 200 is that the inorganic EL
The semiconductor integrated circuit for driving the element 150 can be omitted. Therefore, the IC card 200 can use an existing semiconductor integrated circuit, and the IC card 200
00 can be reduced in cost. IC card 200
Then, the output voltage of the second coil 112 is
Since the driving voltage is 50, the driving voltage of the inorganic EL element 150 changes depending on the communication distance between the IC card 200 and the external device, that is, the power receiving state of the IC card 120. Therefore, the emission luminance of the inorganic EL element 150 changes depending on the distance between the IC card 200 and the external device. IC card 20
At 0, it is necessary to receive a high voltage from the reader / writer in order to drive the inorganic EL element 150. For this reason,
As a carrier frequency (carrier frequency) of the IC card 200, a frequency of about 100 kHz to about several hundreds kHz is suitable. This is because the output of the reader / writer can be increased at a lower frequency according to the regulations of the Radio Law. Second coil 11 for driving inorganic EL element 150
As for No. 2, when a coil (wired coil) wound with a wire is compared with a coil (print coil) etched with a metal foil such as a copper foil or an aluminum foil, the coil depends on the diameter of the wire and the thickness of the foil. However, generally, 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 the IC card according to the present invention, which is related to the above (b). This IC
The card 300 includes a semiconductor integrated circuit (IC) 140, a coil 110 for converting a magnetic signal from a reader / writer (not shown) into an electric signal, a rectifier circuit 120 for rectifying an output voltage of the coil 110, and a rectifier circuit 120. , A constant voltage circuit 130 for generating a drive voltage for the semiconductor integrated circuit 140 from the output voltage, a transformer 180 for inputting and transforming the output voltage of the coil 110, and a visible voltage excited by the output voltage of the transformer 180. Inorganic EL element 1 that emits light
50. The IC card 300 includes a smoothing capacitor C1 connected to an output terminal of the rectifier circuit 120.
And a smoothing capacitor C2 connected to the output terminal of the constant voltage circuit 130. In the above-described IC card 200, a high voltage for driving the inorganic EL element 150 is applied to the coil 112.
When it is difficult to remove the transformer 1 from the coil output voltage, it is difficult to remove the transformer 1 from the coil output voltage.
It is possible to generate a high voltage using 80. IC
In the card 300, the output voltage of the transformer 180 is an inorganic EL
Since the drive voltage of the element 150 is used, the drive voltage of the inorganic EL element 150 changes depending on the communication distance between the IC card 300 and the external device, that is, the power receiving state of the IC card 300. Therefore, the 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 relates to the above (c). This IC
The card 400 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 an output voltage of the coil 110, and a driving voltage of the semiconductor integrated circuit 140 from the output voltage of the rectifier circuit 120 A constant voltage circuit 130, a converter 160 that generates an AC voltage or a switching voltage from an output voltage of the constant voltage circuit 130, and an inorganic EL element 150 that emits visible light when excited by the output voltage of the converter 160. Have. The IC card 400 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. Converter 160 is an inorganic EL element 1
5 is an example of a driving circuit for driving the driving circuit 50; In FIG. 5A, the DC output of the constant voltage circuit 130 is supplied to the converter 160, and the output of the converter 160 is used to output the inorganic EL element 1
50 is driven. The advantage of this IC card 400 is that the driving voltage of the inorganic EL element 150 can be stabilized, and the inorganic EL element
There is a point that the light emission luminance of the element 150 can be kept constant.

As an example of a method for controlling the inorganic EL element,
There are 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 coil 112, the transformer 180, or the converter 16
The inorganic EL element 150 is driven by the output of 0. However, the emission of the inorganic EL element 150 depends on the IC 140
Does not necessarily mean that can be driven. When the input voltage of the inorganic EL element 150 is
Even if it reaches a voltage at which light emission is possible (light emission possible voltage) of 0, I
When the input voltage of C140 does not reach a predetermined voltage (predetermined value) at which IC 140 can operate, inorganic EL element 150 can emit light even though IC 140 cannot be driven. Conversely, if the input voltage of the inorganic EL element 150 does not reach the voltage capable of emitting light even though the input voltage of the IC 140 has reached the predetermined voltage (predetermined value), the inorganic EL element may 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 the IC 140 is driven, a voltage detection circuit is provided for detecting that the output voltage of the power supply circuit has reached the predetermined value and generating a detection signal, and when the output voltage of the power supply circuit has reached the predetermined value. From the demodulation circuit in the IC card,
Power is supplied to a transmission circuit, a central processing unit (CPU), a memory, and the like, and control is performed so as to be operable. IC card 20
In the case of 0 to 400, the voltage detection circuit may be included in the IC 140. In the IC cards 200 to 400, the inorganic E element is disposed between the inorganic EL element 150 and the second coil 112.
Between the L element 150 and the transformer 180, the inorganic EL element 15
0 and a switching circuit such as a semiconductor switch is provided between the converter 160 or the constant voltage circuit 130 and the converter 160, and the detection signal output from the voltage detection circuit is used as a control signal when the driving voltage of the IC 140 reaches the predetermined value. Then, the switch circuit is turned on (ON), and when the predetermined value is not reached, the switch circuit is turned off (OFF). Here, FIG. 5B is a schematic block diagram showing an example of the IC card according to the present invention, and relates to the above (d). In this IC card 500, the output voltage of the constant voltage circuit 130 is
A voltage detection circuit 141 that detects that the IC 140 has reached a predetermined operable voltage and generates a detection signal, and is provided between the converter 160 and the constant voltage circuit 130;
And a switch circuit SW controlled by the detection signal. Further, the detection signal is supplied to the IC 140. Other configurations are the same as the IC card 400,
The description of the other components is omitted. In this way, by controlling the ON / OFF of the switch circuit SW, the IC 140
Can be driven so that the inorganic EL element 150 emits light.
Can be known from the presence or absence of light emission of the inorganic EL element 150.

In FIG. 5B, the voltage detection circuit 14
1 was used as the on / off control signal for the switch circuit SW and, thus, the inorganic EL element 150.
50 other on / off control circuits may be provided to turn on / off the inorganic EL element 150 by another signal. For example,
In a system in which identification data (a unique number, a password, etc.) stored in a memory in an IC card is collated by communicating with an external device, when the collation result indicates a match, the inorganic EL element emits light to use the card. Who
It can be seen from the emission of the inorganic EL element, and hence from the appearance of the IC card, that the collation results match. Further, the card user may be notified using the display of the display device on the external device side or the sound of the sound device.
In this case, the IC card 500 may be provided with a memory in which the identification data is stored in advance, and a configuration in which a matching circuit is connected instead of the voltage detection circuit 141, so that a signal can be transmitted and received between the matching circuit and the IC 140. . The memory may be provided in the IC 140 or in the matching circuit, and the matching circuit may be provided in the IC 140. The collation circuit collates the identification data stored in the memory with the identification data sent from the reader / writer to generate a collation signal according to a collation result, and outputs a collation signal to a control signal of the switch circuit SW. And When the inorganic EL element 150 emits light according to the output voltage of the second coil 112, the second coil 11
A switch circuit SW may be provided between the second and inorganic EL elements 150, and a control signal of the switch circuit SW may be used as the collation signal. When the inorganic EL element 150 emits light in accordance with the output voltage of the transformer 180, a switch circuit SW is provided between the transformer 180 and the inorganic EL element 150,
The control signal of the switch circuit SW may be used as the collation signal. Also, depending on the output voltage of the transformer 180, the inorganic E
When the L element 150 emits light, a switch circuit SW may be provided between the transformer 180 and the inorganic EL element 150, and a control signal of the switch circuit SW may be used as the collation signal. A switch circuit SW is 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 collation signal. However, in order to reduce power consumption, a switch circuit SW is provided between the converter 160 and the constant voltage circuit 130. Preferably, a switch circuit is provided.

On the other hand, in a system in which a single external device can simultaneously communicate with a plurality of IC cards, a collision prevention (anti-collision) circuit for preventing communication collision is provided in the IC card. Control is performed so that only the IC card can perform data communication. And
As a result of the anti-collision processing, when the IC card is selected, the inorganic EL element emits light, and when the IC card is not selected, the light is turned off, so that the card user can determine which IC card is selected, or Whether or not the user's own IC card is selected can be known by turning on / off the inorganic EL element. In this case, the IC card 500 has a configuration in which a collision prevention circuit is connected instead of the voltage detection circuit 141.
A configuration in which signals can be transmitted and received even between 0 and 0 may be adopted. The collision prevention circuit detects that the own IC card is selected by the reader / writer, generates a selection detection signal, and enables the own IC card to communicate with the reader / writer, and allows other ICs not selected to be selected. Prevent collision with cards. The control signal of the switch circuit SW is defined as the selection detection signal. The collision prevention circuit may be provided in the IC 140. When the inorganic EL element 150 emits light in accordance with the output voltage of the second coil 112, the second
A switch circuit SW may be provided between the coil 112 and the inorganic EL element 150, and a control signal of the switch circuit SW may be used as the selection detection signal. When the inorganic EL element 150 emits light in accordance with 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 detected by the selection detection. It may be a signal. A switch circuit SW is 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, but between the converter 160 and the constant voltage circuit 130 to reduce power consumption. It is preferable to provide a switch circuit SW.

Further, in the IC card according to the present invention, the inorganic EL element 150 is turned on / off by controlling on / off, but the lighting is continuously performed in order to reduce the power consumption of the inorganic EL element 150. Instead of blinking.
FIG. 8A is a waveform diagram of a voltage supplied to the inorganic EL element when the inorganic EL element is turned on and when the inorganic EL element is turned on and off. At this time, the inorganic EL element can be turned on and off by providing a clock signal generation circuit in the IC card and periodically turning on / off the clock signal every 100 ms, for example, 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, an output signal of the voltage detection circuit, the collision prevention circuit or the verification circuit may be modulated with a clock signal to be used as a control signal of the switch circuit. The clock signal is supplied to the coils 110, 111, 1
It may be generated directly from the AC voltage from 12 or 115. FIG. 8B is an explanatory diagram illustrating an example of a clock signal generation circuit. The frequency of the magnetic signal output from the 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 AC voltage. Clock signal generation circuit 1
70, an extraction circuit 171 for extracting a signal of a frequency of a magnetic signal from an output voltage of the coil 110;
And a frequency dividing circuit 172 for dividing the frequency of one output signal. 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 of an appropriate frequency may be generated by a frequency dividing circuit. Alternatively, the inorganic EL element can be turned on and off using this clock signal. Further, the duty factor (on / off ratio) of 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 ratio of the on-time as in 1: 8).

(E) ON and OFF of the inorganic EL element are separately controlled. In the above (d), 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 control of the inorganic EL element 150 is controlled by one output signal. It is not necessary, and ON and OFF may be controlled by separate output signals. FIG.
FIG. 6A is a schematic block diagram showing an example of an IC card according to the present invention. As shown in FIG. 6A, a collision is detected by using an RS flip-flop (RS-FF) circuit which is an example of a latch circuit. It is also possible to adopt a configuration in which the circuit is controlled to be turned on by the output of the prevention circuit 143 and controlled to be turned off by the output of the matching circuit 142. This IC card 600 is the IC card 50
0, instead of the voltage detection circuit 141, the collision prevention circuit 1
43 and the matching circuit 142, and the collision prevention circuit 14
3 and the output signal of the matching circuit 142 are supplied to the RS-FF circuit 144.
4 is used as a control signal for the switch circuit SW,
140, the collision prevention circuit 143, and the collation circuit 142 are configured to be able to transmit and receive signals. The RS-FF circuit 144 changes to the first state according to the selection detection signal output from the collision prevention circuit 143, and changes to the second state according to the verification signal output from the verification circuit 142.
Generates an output signal corresponding to the state. Another configuration is I
This is the same as the C card 500, and the description of the other components 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 collation in the IC card 600. When the identification data matches, the inorganic EL element 150 can be turned off by turning off the switch circuit SW. The card user can know that the IC card 600 is in the selected state by turning on the inorganic EL element 150, and can know that the result of the data collation is the same by turning off the inorganic EL element 150.

On the other hand, in the system in which the card processing is terminated when the data collation results in a match, the card user removes the operation of holding the IC card 600 over an external device by turning off the inorganic EL element 150. Can be determined to be acceptable. This is desirable in a system in which one external device can communicate with a plurality of IC cards. Because, in the conventional system, when a plurality of IC cards are held over one external device, the display device of the external device is
The only way to identify the IC card is to display the unique number or identification data of the IC card.
You can know the operating status of the C card, but it takes time. However, in the IC card 600, the inorganic E
The operating state of the IC card 600 can be easily known from the display state of the L element 150. In the IC card 600, a configuration in which ON and OFF are separately controlled has been exemplified.
Output signals for controlling ON and OFF can be freely combined depending on the system to be operated. Second
Of the inorganic EL element 150 according to the output voltage of the coil 112 of FIG.
, A switch circuit SW may be 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 an output signal of the RS-FF circuit 144. When the inorganic EL element 150 emits light in accordance with 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 transmitted to the RS-FF circuit. 1
44 may be used as the output signal. A switch circuit SW is provided between the converter 160 and the inorganic EL element 150, and a control signal of the switch circuit SW is transmitted to the RS-FF circuit 14.
4, but it is preferable to provide a switch circuit SW between the converter 160 and the constant voltage circuit 130 in order to reduce power consumption.

(F) A plurality of inorganic EL elements are separately controlled. In the IC cards 200 to 600, one is stored in the IC card.
Although the case of mounting the inorganic EL elements 150 has been described,
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 a voltage is applied. Detection circuit 1
The switch 41 is turned on / off by the output of 41 to turn on / off the inorganic EL element 151, and the matching circuit 1
The on / off control of the switch circuit SW2 is performed by the output of 42 to cause the inorganic EL element 152 to emit / turn off the light. In the IC card 700, the output of the voltage detection circuit 141
When the 40 is operable, the inorganic EL element 151 emits light, and then the collation circuit 142 performs collation, and when the identification data matches, the inorganic EL element 152 emits light.
Thus, when the card user brings the IC card 700 close to the external device, the IC 140 can operate and
The fact that the C card 700 can communicate is indicated by the inorganic EL element 1
It is possible to know from the light emission of the IC card 700 from the light emission of the inorganic EL element 152 that it is possible to know from the light emission of the IC card 700 that the data collation result indicates a match. The IC card 700 is different from the IC card 500 in that a plurality of inorganic EL elements, switch circuits, and converters are provided, and a matching circuit 142 is provided.
1 to control the light emission of the inorganic EL element 151, and to switch the second switch circuit SW2 to the matching circuit 1
The inorganic EL element 152 is controlled by a collation signal from
This is a configuration for controlling the emission of light. First switch circuit SW
1 is provided between the converter 161 and the constant voltage circuit 130, and the second switch circuit SW2 is connected to the converter 1
It is provided between 62 and the constant voltage circuit 130. The matching 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 A switch circuit SW2 may be provided between the switching element SW2 and the EL element 152. When the inorganic EL elements 151 and 152 emit light in accordance with the output voltage of the transformer 180, a switch circuit SW1 is provided between the transformer 180 and the inorganic EL element 151, and the switch circuit SW1 is provided between the transformer 180 and the inorganic EL element 152. May be provided with a switch circuit SW2. A switch circuit SW1 may be provided between the converter 161 and the inorganic EL element 151, and a switch circuit SW2 may be provided between the converter 162 and the inorganic EL element 152. However, between the converter 161 and the constant voltage circuit 130 to reduce power consumption. Switch circuit SW
1, and a switch circuit SW2 is preferably provided between the converter 162 and the constant voltage circuit 130.

In the IC card 700, both of the inorganic EL elements 151 and 152 may be controlled by a collation signal output from the collation circuit 142. For example, the matching circuit 14
2, the switch circuit SW1 is turned on to cause the inorganic EL element 151 to emit light when the result of the data collation in step 2 indicates a match, and the switch circuit SW2 is turned on when the result of the data collation indicates a mismatch. The EL element 152 emits light. In this case, the card user can know the collation result of the collation circuit 142 based on which of the inorganic EL elements 151 and 152 emits light, and can know the operation status of the IC card 700 in more detail.

Also, a configuration may be adopted in which the above (d) and the above (e) are combined, and the IC card 500 and the IC card 600 are combined. For example, in the IC card 600, the inorganic EL element 150 is replaced with the second inorganic EL element 15
2 and the switch circuit SW is replaced with the second switch circuit SW2.
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. Then, as an example, the on / off of the switch circuit SW1 is controlled by the detection signal of the inorganic EL element 151, and the light emission / extinguishing of the inorganic EL element 151 is controlled. Also,
When the result of the collision prevention processing of the collision prevention circuit 143 indicates the selection and the selection detection signal is generated, the switch circuit S
W2 may be turned on to cause the inorganic EL element 152 to emit light. Further, when the result of the data collation by the collation circuit 142 indicates a match, and a collation signal indicating the match is generated, the switch circuit SW2 may be turned off to turn off the inorganic EL element 152. The switch circuit SW1,
Regarding SW2, 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 EL element
A switch circuit SW2 may be provided between the element 152. The switch circuits SW1 and SW2 are connected to the inorganic EL element 15 according to the output voltage of the transformer 180.
1 and 152, the transformer 180 and the inorganic E
A switch circuit SW1 is provided between the L element 151 and the switch circuit S1 between the transformer 180 and the inorganic EL element 152.
W2 may be provided. Also, the switch circuits SW1, SW1
For SW2, converter 161 and inorganic EL element 1
51, a switch circuit SW1 is provided.
Switch circuit SW2 between the organic EL element 62 and the inorganic EL element 152.
May be provided, but converter 1 is used to reduce power consumption.
It is preferable that a switch circuit SW1 is provided between 61 and the constant voltage circuit 130, and a switch circuit SW2 is provided between the converter 162 and the constant voltage circuit 130.

The emission colors of the inorganic EL elements 151 and 152 may be distinguished from each other by the arrangement of the inorganic EL elements as the same color. However, if the colors are different from each other, the card user determines which inorganic EL element is used. This is more preferable.

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

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

(H) Numbers and the like are displayed by segment display. FIG. 7A is a schematic block diagram of a display element for performing segment display and its driving circuit. The segment of this display element is composed of inorganic EL elements 150a to 150g,
The L elements 150a to 150g are driven by the drive circuit 165 and emit visible light. The display element and the driving circuit may be provided in the IC card according to the present invention. The driving circuit 165 receives 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 to emit light from the control signal, and switch circuits SWa to SWg provided between the converter and the inorganic EL elements 150a to 150g. Then, 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, frequency, and the like for prepaid use by using the segment-type display element made of the inorganic EL element, and to store the communication information with the reader / writer and the memory in the IC card. It is possible to display the stored information.

(I) Characters are displayed by dot display. FIG. 7B is a schematic block diagram of a display element for displaying dots and a driving circuit thereof. The dots of this display element are inorganic EL elements 150 _{11 to} 150 _MN arranged in a matrix.
Consists of 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. IC
Microcomputer (microcomputer) not shown in the card
Is input to the drive circuit 166, and dot display can be controlled by the microcomputer. This microcomputer may be provided in the IC 140. The display element and the driving 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.
The M back electrodes from 66 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 specifies a row-direction inorganic EL element to emit light from the control signal, and a second decoder that specifies a column-direction inorganic EL element to emit light from the control signal. First switch circuits SW1a to SW1 provided between the decoder and the converter and the inorganic EL elements in the row direction;
g, and second switch circuits SW2a to SW2g provided between the converter and the inorganic EL elements in the column direction, and among the switch circuits SW1a to SW1g in the row direction specified by the first decoder. The switch circuit connected to the inorganic EL element is controlled to be turned on, and the switch circuit SW
A switch circuit connected to the inorganic EL element in the column direction specified by the second decoder among 2a to SW2g is controlled to be turned on. Thus, the inorganic EL
It is possible to display the amount of money for prepaid use, frequency, etc. using a dot-type display element composed of elements, and it is also possible to display communication information with the reader / writer and storage information stored in a memory in an IC card. It is possible to display characters (text) and images. Thereby, “OK”, “NG”, “PAS”
Various information such as "S" and "FAIL" can be displayed in dots. In the same manner as the dot type display element, the matrix type display element may be constituted by an inorganic EL element and provided in the IC card.

In the case of displaying information as described in (h) to (i) above, it is necessary to control each segment or dot, which may lead to an increase in the circuit scale and the cost. To make this control simple,
Display characters such as "K" and "NG" may be determined in advance, and the characters may be displayed. In addition, the inorganic EL element which 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, so that the character is emitted when the inorganic EL element emits light. , And the fixed information can be displayed by the characters.

In the above embodiment, a non-contact type IC card is assumed, but an EL element may be mounted on the contact type IC card. Many external devices of the contact type IC card insert the entire IC card into the slot. However, some small (simplified) 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. An external device covered with a transparent housing,
There may be an external device of a type in which the inserted IC card is visible from the outside. In such a case, by mounting the inorganic EL element on the contact type IC card, the operating state of the IC card can be known from the external appearance of the IC card, similarly to the non-contact type IC card.

FIG. 9A is a schematic block diagram showing an example of a contact type IC card according to the present invention. This contact type I
The C 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 driving voltage, and the connection terminal T1. Converter 1 for generating an AC voltage or a switching voltage from the circuit voltage Vcc
60, an inorganic EL element 150 that emits visible light according to the output voltage of the converter 160, and connection terminals T2, T
3, T5 to T7. 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. Connection terminals T2, T3
T7 is connected to the IC 140. The circuit voltage Vcc is supplied to the connection terminal T1. The reset signal RST is supplied to the connection terminal T2. The clock signal CLK is supplied to the connection terminal T3. The ground voltage (ground voltage) GND is supplied to the connection terminal T5. The connection terminal T6 is supplied with the program supply voltage Vpp. Data is input / output to / from the connection terminal T7, and input data or output data is supplied. The contact type IC card 950 has the simplest circuit configuration, and the circuit voltage Vcc is +5 V according to the ISO standard.

As shown in FIG. 9B, the output voltage of the converter 160 may be used as a drive voltage, and the emission of the inorganic EL element 150 may be controlled from an IC.
The contact type IC card 970 includes a connection terminal T1 to which a circuit voltage Vcc is supplied from a reader / writer (not shown), and a semiconductor integrated circuit (IC) 1 using the circuit voltage Vcc as a driving voltage.
45, a converter 160 for generating an AC voltage or a switching voltage from the circuit voltage Vcc supplied to the connection terminal T1, an inorganic EL element 150 for emitting visible light according to an output voltage of the converter 160, and the converter A switching circuit provided between the switching circuit and the connection terminal; and a control signal for the switching circuit is generated by the IC to control on / off operation of the switching circuit from the IC. It is. 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. Connection terminal T5
Are connected to the IC 145 and the inorganic EL element 150. The connection terminals T2, T3, T7 are connected to the IC 145. The converter 160 and the inorganic EL device 1
A switching circuit SW may be provided between the switching circuit SW and the switching circuit 50.

Corresponding to the IC cards 500 to 700, a contact type IC card having an inorganic EL element can have the same configuration. In the IC cards 500 to 700, the coil 110, the rectifier circuit 120, and the capacitor C
1 and the constant voltage circuit 130 are removed, and the constant voltage circuit 1 is removed.
The connection terminal T1 may be used instead of the output terminal 30 and the converter 160 may be configured to input the terminal voltage of the connection terminal T1. Further, a segment type display element shown in FIG. 7A and a driving circuit 165 thereof may be provided.
And a driving circuit 166 for the dot type display element.

Recently, there is an IC card called a combination card, a dual interface IC card, a 2-way access card, or the like, in which one IC card has an interface of both a non-contact type IC card and a contact type 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. This IC card 980
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 a visible light according to an output voltage of the converter 160. A light emitting inorganic EL element 150; a switch circuit SW provided between the converter 160 and the connection terminal T1; a coil 110 for converting a magnetic signal from a reader / writer (not shown) into an electric signal; A rectifier circuit 120 for converting an output voltage from an alternating current to a direct current, a constant voltage circuit 130 for generating a drive voltage for the IC from the output voltage of the rectifier circuit 120, the constant voltage circuit 130 and the converter 16
0, and a switch circuit SW3 provided between the converter 160 and the connection terminal T1. The switch circuit SW3
The control signal of SW4 is generated by the IC 146 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 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 from the reader / writer by a magnetic signal. The connection terminal T5 is connected to the IC 146 and the converter 160. Connection terminals T2, T3, T7 are IC
146.

The power supply voltage generated by the rectifier circuit 120 and the constant voltage circuit 130 from the output voltage of the coil 110 or the power supply voltage supplied from the connection terminal T1 is input to the IC 146 as a drive voltage. The IC 146 has a discriminating circuit for discriminating between the case where power is supplied via the coil 110 and the case where power is supplied via the connection terminal T1. One of the switches SW4 is turned 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 via the coil 110 and power is supplied via the connection terminal T1, one of the switch circuits SW3 and SW4 is controlled to be turned on. 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 emitting different 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 can change the power receiving state to an inorganic color by emitting light in different colors. It can be recognized from the emission color of the EL element.

FIG. 11 is a circuit diagram showing an example of the converter. This converter has 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.
Between the collector and the emitter of the transistors Q1 to Q4,
The reverse diodes D1 to D4 are respectively connected to form a protection circuit against spike voltage. The transistors Q1 to Q4 form a bridge circuit, and the opposing transistors Q1 and Q3 and the opposing transistor Q
By alternately turning on / off 2 and Q4, an AC voltage can be applied to the load 155 such as an inorganic EL element. 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 has a rectangular waveform, but the on / off of the transistors Q1 to Q4 is finely adjusted. By controlling, it is possible to apply a voltage close to a sine wave. Control signals SQ1 to SQ are provided at the bases of the transistors Q1 to Q4.
Q4 is supplied, for example, control signals SQ1 to
SQ4 is supplied and the transistors Q1-Q4
Can be controlled. A high voltage is generated from a 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 a DC power supply V9 in FIG. The rectifier circuit 12 is provided by the booster circuit.
Even when the output voltage of the constant voltage circuit 130 is zero or low, the inorganic EL element can be driven. As described above, a DC / AC conversion circuit (DC-AC converter or inverter) may be used as converter 160, and a voltage conversion circuit (DC
-DC converter).

Since the inorganic EL element can emit light over a wide area by surface emission, it is possible to prevent the light emitting portion from being hidden by the fingertip holding the IC card. The size of the inorganic EL element mounted on the IC card is, for example, larger than an area where one finger, for example, a finger of a thumb or a forefinger touches one surface of the IC card when the IC card is picked and held with one finger. 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.

[0051]

According to the IC card of the present invention, the inorganic EL element emits light from the surface, so that the IC card can emit light over a wide range, and the inorganic EL element makes it easy for the card user to display various information. .

Since the first IC card of the present invention has an inorganic EL element which emits light when excited by an externally supplied voltage, the inorganic EL element can emit light during power reception or communication from a reader / writer. The operation of the IC card can be displayed by the inorganic EL element, and the card user can know the operation of the IC card from the appearance of the IC card.

In the second IC card of the present invention, the inorganic EL element emits light when excited by the output voltage of the coil.
The operation of the IC card can be displayed by the inorganic EL element with a simple circuit configuration, and the card user can know the operation of the IC card from the appearance of the IC card. Further, the magnitude of the power received from the reader / writer can be known from the emission luminance of the inorganic EL element.

In the third IC card of the present invention, since the inorganic EL element emits light when excited by the output of the converter that inputs the output voltage of the constant voltage circuit, the operation of the IC card can be displayed by the inorganic EL element. The card user can know the operation of the IC card from the external appearance of the IC card. In addition, the communicable distance with the reader / writer can be known from the presence / absence of light emission of the inorganic EL element, and the luminous brightness of the inorganic EL element can be kept constant within a communicable range. It is possible to make the display even easier to see.

In the fourth IC card of the present invention, the inorganic EL element emits light when excited by the output of the converter which inputs the terminal voltage of the connection terminal to which the circuit voltage is supplied from the reader / writer. The operation of the card can be displayed, and 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.

[Brief description of the drawings]

FIG. 1 shows an inorganic electroluminescence device (inorganic EL).
FIG. 4 is an explanatory diagram illustrating an example of a device.

FIG. 2 shows an organic electroluminescence device (organic EL)
FIG. 4 is an explanatory diagram illustrating an example of a device.

FIG. 3 is an explanatory view illustrating and explaining a multicolor organic EL element.

FIG. 4 is a schematic block diagram illustrating an IC card according to the present invention.

FIG. 5 is a schematic block diagram illustrating an IC card according to the present invention.

FIG. 6 is a schematic block diagram illustrating an IC card according to the present invention.

FIG. 7 is a schematic block diagram illustrating a display element and a driving circuit thereof.

FIG. 8 is an explanatory diagram illustrating a drive voltage waveform of the inorganic EL element when the inorganic EL element is turned on and turned on and off, and a circuit that generates a clock signal having a blinking cycle.

FIG. 9 is a schematic block diagram illustrating an IC card according to the present invention.

FIG. 10 is a schematic block diagram illustrating an IC card according to the present invention.

FIG. 11 is a circuit diagram illustrating an example of a converter.

[Explanation of symbols]

1, 11, 51, 61, 71, 81: plastic substrate, 2, 12, 22, 32, 52, 62, 72R, 72
G, 72B, 82R, 82G, 82B ... transparent electrode, 1
5, 25, 35 ... transparent electrode, 3, 13, 21, 23, 3
1,33 ... insulating layer, 4,14,24,34 ... dielectric layer,
5,56,66R, 66G, 66B, 76R, 76G,
76B, 86R, 86G, 86B: back electrode, 9: AC power supply, 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, 130: constant voltage circuit, 14
0, 145, 146... Semiconductor integrated circuit (IC), 141
... voltage detection circuit, 142 ... collation circuit, 143 ... collision prevention circuit, 144 ... RS-FF circuit, 150, 150a-1
50 g, 150 _{11 to} 150 _MN , 151, 152 ... inorganic electroluminescent element (inorganic EL element), 155
.., Load, 160, converter, 165, 166, drive circuit, 170, clock signal generation circuit, 171, extraction circuit, 172, frequency divider circuit, 180, transformer, 200, 30
0,400,500,600,700,950,97
0,980: IC card, C1, C2, C3, C9: capacitor, D1 to D4: diode, GND: ground voltage (ground voltage), Q1 to Q4: transistor, SW ...
Switch circuit, SW1 switch circuit (first switch circuit), SW2 switch circuit (second switch circuit), T1 to T3, T5 to T7 connection terminals, V9 DC power supply.

Claims (18)

[Claims] 1. An IC card having an inorganic electroluminescent element that emits visible light when excited by an externally supplied voltage. 2. An IC card comprising: a coil for converting a magnetic signal from a reader / writer into an electric signal; and an inorganic electroluminescent element which emits visible light when excited by an output voltage of the coil. 3. The IC card according to claim 2, further comprising a transformer that receives an output voltage of the coil and transforms the voltage, wherein the inorganic electroluminescence element emits visible light when excited by the output voltage of the transformer. . 4. A semiconductor integrated circuit, a coil for converting a magnetic signal from a reader / writer into an electric signal, a rectifying circuit for rectifying an output voltage of the coil, and driving the semiconductor integrated circuit from an output voltage of the rectifying circuit. A constant voltage circuit that generates a voltage; a converter that generates an AC voltage or a switching voltage from an output voltage of the constant voltage circuit; and the inorganic electroluminescence element that emits visible light when excited by an output voltage of the converter. IC card. 5. A voltage detection circuit for detecting that an output voltage of the constant voltage circuit has reached a predetermined voltage at which the semiconductor integrated circuit can operate, and generating a detection signal; 5. The IC card according to claim 4, further comprising a switch circuit provided between the luminescence element or between the converter and the constant voltage circuit and controlled by the detection signal. 6. A memory storing identification data in advance, and comparing the identification data stored in the memory with the identification data sent from the reader / writer to generate a matching signal according to a matching result. The IC card according to claim 4, further comprising: a matching circuit; and a switch circuit provided between the converter and the inorganic electroluminescence element or between the converter and the constant voltage circuit and controlled by the matching signal. 7. Detecting that the own IC card is selected by the reader / writer, generating a selection detection signal, and enabling the own IC card to communicate with the reader / writer,
A collision prevention circuit for preventing a communication collision with another IC card that is not selected; and a collision prevention circuit provided between the converter and the inorganic electroluminescence element or between the converter and the constant voltage circuit. 5. The IC card according to claim 4, further comprising a controlled switch circuit. 8. A memory that stores identification data in advance, and compares the identification data stored in the memory with the identification data sent from the reader / writer to generate a matching signal according to a matching result. A matching circuit, detecting that the own IC card is selected by the reader / writer, generating a selection detection signal, and enabling the own IC card to communicate with the reader / writer, and communicating with another IC card not selected. A collision prevention circuit that prevents collision, a latch circuit that changes to a first state according to the selection detection signal, and changes to a second state according to the comparison signal, between the converter and the inorganic electroluminescent element or And a switch circuit provided between the converter and the constant voltage circuit and controlled by an output signal of the latch circuit. 4. The IC card according to 4. 9. The inorganic electroluminescent element comprises first and second inorganic electroluminescent elements, and an output voltage of the constant voltage circuit has reached a predetermined voltage at which the semiconductor integrated circuit can operate. A voltage detection circuit that generates a detection signal by detecting the identification data; a memory that stores the identification data in advance; and a comparison between the identification data stored in the memory and the identification data sent from the reader / writer. A matching circuit that generates a matching signal according to a result; and a matching circuit that is provided between the converter and the first inorganic electroluminescent element or between the converter and the constant voltage circuit and controlled by the detection signal. 1
A switching circuit provided between the converter and the second inorganic electroluminescent element or between the converter and the constant voltage circuit, and controlled by the comparison signal.
The IC card according to claim 4, further comprising: a switch circuit. 10. When the output voltage of the constant voltage circuit has reached the predetermined voltage, the first inorganic electroluminescent element is caused to emit light, and when the comparison result of the comparison circuit indicates that the identification data matches. 10. The IC card according to claim 9, wherein the second inorganic electroluminescence element emits light. 11. The inorganic electroluminescent element includes first and second inorganic electroluminescent elements, and an output voltage of the constant voltage circuit has reached a predetermined voltage at which the semiconductor integrated circuit can operate. A voltage detection circuit that generates a detection signal by detecting the identification data; a memory that stores the identification data in advance; and a comparison between the identification data stored in the memory and the identification data sent from the reader / writer. A matching circuit for generating a matching signal according to the result; and detecting that the own IC card is selected by the reader / writer, generating a selection detection signal, and enabling the own IC card to communicate with the reader / writer. A collision prevention circuit for preventing a communication collision with another IC card which has not been performed, the converter and the first inorganic electroluminescent device. The or between the converter and Ssensu element provided between the constant voltage circuit, the controlled by the detection signal 1
A switch circuit provided between the converter and the second inorganic electroluminescent element or between the converter and the constant voltage circuit, and controlled by the comparison signal and the selection detection signal. An IC card having a switch circuit, wherein when the selection detection signal is generated by the collision prevention circuit, the second inorganic electroluminescence element emits light, and the collation result of the collation circuit matches identification data. 5. The IC card according to claim 4, wherein the second inorganic electroluminescence element is turned off in the case of the following. 12. The light emission color of the first and second inorganic electroluminescence elements is different from each other.
2. The IC card according to claim 1. 13. A connection terminal to which a circuit voltage is supplied from a reader / writer; a semiconductor integrated circuit that uses the circuit voltage as a drive voltage; and an AC voltage or a switching voltage generated from the circuit voltage supplied to the connection terminal. An IC card comprising: a converter that emits visible light when excited by an output voltage of the converter; and an inorganic electroluminescence element that emits visible light. 14. The IC card has a switch circuit provided between the converter and the inorganic electroluminescent element or between the converter and the connection terminal, wherein the semiconductor integrated circuit includes the switch circuit. The IC card according to claim 13, wherein the control signal is generated as follows. 15. The IC card has a display element for displaying a segment of communication information with the reader / writer or storage information stored in a memory in the IC card, and each segment is formed by the inorganic electroluminescence element. 15. The IC card according to claim 1, wherein the IC card is configured. 16. The IC card has a display element for displaying dots of communication information with the reader / writer or storage information stored in a memory of the IC card, and each dot is formed by the inorganic electroluminescence element. 15. The IC card according to claim 1, wherein the IC card is configured. 17. The IC card has a display element for displaying communication information with the reader / writer or storage information stored in a memory in the IC card in a matrix, wherein the display element is the inorganic electroluminescence element. 15. The IC card according to claim 1, wherein the IC card is constituted by: 18. The inorganic electroluminescence element, comprising: a plastic substrate; a transparent electrode formed on the plastic substrate; a back electrode; an insulating layer formed between the back electrode and the transparent electrode; The IC card according to claim 1, wherein the dielectric layer that emits the visible light is sandwiched between the back electrode and the transparent electrode via the insulating layer.