JPH0481989A - Ic card - Google Patents

Abstract

PURPOSE:To obtain an IC card to which an application function can be adders easily by providing a first and a second key input parts. CONSTITUTION:The IC card 20 has a card base material 21 consisting of plastic, metal, etc., and on the surface of its card base material 21, a first key input part 22 and a second key input part 23, a first display part 24 and a second display part 25, and a contact part 26 are provided. Since a first and a second key input parts 22, 23 are provided, the number of pieces of keys can be increased without spoiling the operability. In such a way, an application function such as a memo function, a telephone number registering function, etc., can be added easily, and the IC card being excellent in the multi-function conversion can be realized.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention has a key input section, a power supply section, a display section, etc., each having operation keys, and the operation keys can be used to perform transaction processing, transaction history inquiry processing, and calculation. The present invention relates to the structure of an IC card that performs various processes such as processing.

(Prior art) Conventionally, as this type of IC card, for example, Japanese Patent Laid-Open No. 61
There was one described in Publication No.-5389. The configuration will be explained below using figures.

FIGS. 2(a) and 2(b) are external views showing an example of the configuration of a conventional IC card. It is a perspective view seen from the surface side.

This IC card 10 has a card base material 11, and on one surface side of the card base material 11, a key input section 12 having data input keys for various operations of the card, and a reflective display structure. A display section 13 composed of a liquid crystal display (hereinafter referred to as LCD), and a power supply section 14 composed of a solar cell.
Further, on the other surface side, a contact portion 15 is provided which functions as a means for transmitting and receiving signals with the outside.

Additionally, inside the card base material 11, there is a data storage section made of non-volatile memory etc. for storing programs and data, a control section including a central processing unit (hereinafter referred to as CPU), and a display drive for displaying data. An IC chip section 16 in the form of one chip or a plurality of chips is buried therein.

In the above configuration, when pressing a key on the key input unit 12 and applying the key force to the control unit, or when trying to contact an external device using the contact unit 15, the control unit controls the key input unit 12, the display part 13 and contact part 15
, and processes programs stored in the data storage unit. As a result, various processes are performed, such as writing data related to transactions according to the purpose of the card into the internal data storage section, and displaying data in the data storage section and data on calculation results by the control section on the display section 13. will be held.

(Problem to be Solved by the Invention) However, in the IC card with the above configuration, the key input section 12 and the display section 13 are installed only on one side of the card base material 11, so the number of keys that can be installed on one side is limited. There was a problem in that it was difficult to add application machine functions due to the limitations.

That is, conventionally, within the range of the number of keys in the key input section 12,
For example, when adding application functions such as a phone number registration function or a memo function, multiple types of key marks are printed on one key to provide multiple types of key manual functions on one key, such as function key operation, etc. The function of the key is selected by the button.

However, in this case, many types of key marks are printed on one key, making the keys difficult to see and confusing key operations, resulting in poor usability.

The present invention provides an IC card that solves the problem of the prior art, which is that it is difficult to add application functions because the number of keys that can be installed on one side is limited.

(Means for Solving the Problem) In order to solve the problem, the first invention provides a key input section for data input, a display section and display drive section for displaying data, and a display section for storing programs and data. a data storage section; a control section that controls the key input section, the display section, the display drive section, and the data storage section; the key input section, the display section;
An IC card in which a power supply unit that supplies power to a display drive unit, a data storage unit, and a control unit is provided in a card base material,
The following measures were taken.

That is, the key input section includes a first key input section disposed on one surface of the card base material and having a first lock key, and a first key input section disposed on the other surface of the card base material and having a second lock key. and a second key input section having a key input section, and the display section has a first
and a second display section disposed on the same surface as the second key input section, and when the first or second lock key is operated, the first or second key input section is A key input switching section is provided for switching between data inputs of the key input section, one of which is valid and the other is invalid.

In a second invention, in the first invention, the display section has a double-sided display structure (for example, a transmissive display structure) that displays on both surfaces of the card base material, and the first or second
A display switching section is provided for switching the display section to a display direction corresponding to the switching operation of the key input switching section based on the operation of the lock key.

A third aspect of the present invention is that in the first or second aspect, the power source section is constituted by a solar cell having light receiving sections on both surfaces of the card base material.

(Function) According to the first invention, the first and second key input sections have keys disposed on both sides of the card base material, and the first and second key input sections are configured to have keys arranged on both sides of the card base material, and the first and second key input sections are configured to perform a switching operation of the key input switching section. It serves to arrange second lock keys on both surfaces of the card base material.

The first and second display sections function to display data by key operations on the first and second key input sections. For example, the data may be displayed by simultaneously displaying the same content on the first and second display sections while the IC card is in use, or by displaying the same content on the first and second display sections at the same time. For example, there is a method of switching and displaying only the display section located on the first or second key input section side based on an operation such as pressing the first and second lock keys.

The key input switching section enables one of the first and second key input sections to permit data input from the key input section in response to operations of the first and second lock keys. , the other key input section is disabled and data input from that key input section is prohibited. That is, the key input switching section can perform a circuit design or the like to operate the first lock key (or second lock key), for example, among the first and second lock keys. Enable data input on the first key input section (or second key input section) and disable data input on the second key input section (or first key input section); By operating the lock key (or the second lock key), the data input of the first key input section (or the second key input section) is disabled, and the data input of the second key input section (or the first key input section) is disabled. The first and second key input sections are enabled/disabled by any one of the settings, such as enabling data input of the key input section (key input section).

According to the second invention, the display section functions so that the display can be checked from both surfaces of the card base material. That is, the display section is composed of, for example, a liquid crystal display (LCD), and when composed of, for example, an LCD, the LCD is
It has a liquid crystal layer and is constructed without providing a reflective plate so that the display of the liquid crystal layer can be seen from both surfaces of the card base material.

According to the third invention, the solar cell functions to supply power if light is irradiated onto either or both of the surfaces of the card base material.

Therefore, the above problem can be solved.

(Embodiment) FIG. 1 is a schematic circuit block diagram of an IC card showing a first embodiment of the present invention. 3(a) and 3(b) are schematic external views of the IC card shown in FIG. 1. FIG. 3(a) is a plan view from one front side, and FIG. 4 is a schematic functional block diagram of the control section in FIG. 1, and FIG. 5 is a circuit configuration diagram of the key input switching section and lock key in FIG. 1. In addition, Figure 3,
In FIGS. 4 and 5, common elements with those in FIG. 1 are given the same reference numerals.

This IC card 20 has a card base material 21 made of, for example, plastic, metal, etc.
1, a first key input section 22, a second key input section 23, a first display section 24, a second display section 25, and a contact section 26 are arranged.

The first key input section 22 is disposed on one surface of the card base material 21, and includes a lock key 22a for validating only data input by the first key input section 22, and a numerical value "
0'', ``1co'', ... ``9'' numeric keypad, ``Transaction'', ``
It consists of function keys such as "Query", "R", "Memo", etc. The second key input section 23 is arranged on the other surface side of the card base material 21, and the second key input section 23
Lock key 23a to enable only data entry
, and for example the alphabet 'AJ, rB, . . .
It consists of a numeric keypad such as "Z". Here, the lock keys 22a, 23a, etc. are a resistor 22a-1 and a switch 22a-2, a resistor 23a-1 and a switch 23a-2 connected in series between the power supply potential CC and the ground potential GND.
etc., and the vertical directions of the key marks are set, for example, in the same direction.

The first display section 24 and the second display section 25 are configured by, for example, an LCD with a reflective display structure, and each of the first display section 24 and the second display section 25 are
1. Here, the first display 2
4 and the second display 25 are provided at positions where they do not overlap in order to make the thickness of the card base material 21 as thin as possible.

The contact portion 26 is for electrically connecting to the external device when the IC card 20 is set in an external device having a card processing function, etc. It is placed exposed.

Furthermore, an IC chip section 30 is provided inside the card base material 21.
, and a power supply section 35 composed of, for example, a secondary battery. The IC chip section 30 includes one or more ICs.
Consists of a chip, including a data storage section 31 and a display drive section 32
, a control section 33, a key input switching section 34, and the like.

The data storage unit 31 is, for example, a read-only memory (ROM) for storing programs, an electrically rewritable programmable ROM (EEPROM) for storing data that requires security such as a password, or a programmable ROM (EEPROM) that can be read and written at any time. It consists of memory (RAM), etc.

The display drive section 32 is a circuit for driving the first display section 24 and the second display section 25, and is composed of, for example, a driver for liquid crystal display.

In terms of functional blocks, the control unit 33 includes, for example, a calculation processing unit 33-1 for calculator calculation, a transaction processing unit 33-2, a transaction history inquiry processing unit 33-3, and a telephone number processing unit, as shown in FIG. It has a memo function processing section 33-4, a memo function processing section 33-5, a mode switching processing section 33-6, and the like.

The key input switching section 34 is configured to enable one of the first key input section 22 connected via the bus C1 or the second key input section 23 connected via the bus C2 and disable the other. 3-state buffers 34 a-1 to 34 a-n and 34
It is equipped with b-1 to 34b-n. The 3-state buffers 34a-1 to 34a-n are connected to each key of the first key input unit 22 except the first lock key 22a via the bus C1, and the 3-state buffers 34b-1 to 34b-3
4b-n is the second lock key 23a via the bus C2.
are connected to each key of the second key input unit 23 except for. In addition, 3-step buffers 34a-1 and 34b
-1,3 state buffers 34a-2 and 34b-2,
. . . The outputs of the three-state buffers y34a-n and 34b-n are commonly connected, and each is connected to the control unit 33 and the like via the bus C3.

Further, the key input switching section 34 has a flip 70 tab 34c on the J- side. Flip-flop 3 on this J-
4c is an input terminal J connected to a power supply voltage CC, an input terminal connected to a ground potential GND, a clock input terminal CLK connected to the first lock key 22a by a signal line L1, and a signal line Second lock key 2 via L2
3a, a positive phase output terminal Q connected to each control input terminal of 3-state buffers 34b-1 to 34b-n via control line L3, and 3a via control line L4. State buffers 34a-1 to 34a
−n respectively, and a negative phase output terminal connected to each control input terminal.

Next, the operation when using the IC card 20 will be explained.

First, by operating the first lock key 22a or the second lock key 23a, for example, by pressing the ring, the key to be used is selected between the first key input section 22 and the second key input section 23. only one is valid, and the other that is not used is invalid. For example, when using the first key input unit 22, the first lock key 22a is pressed. Then, the first
The switch 22a-2 of the lock key 22a is turned on, and the flip-flop 34c goes to the level of the signal line L1, that is, J-.
The level of the clock input terminal CLK falls from high level to low level. As a result, the flip-flop 34c is set to J-, the positive phase output terminal Q and the signal line L
3 is at high level, the negative phase output terminal and signal line L4 are at low level, and 3-state buffers y34b-1 to 34b
-n is closed, 3-state buffers 34a-1 to 34a-
n opens. Therefore, data input from the first key input unit 22 is valid (permitted), and data input from the second key input unit 23 is invalid (prohibited).

Press the first lock key 22a to open the first key input section 2.
After enabling only 2, press the function key "Trade",
By pressing "Inquiry", "R", "Memo", etc., the mode switching processing unit 33-6 performs mode switching according to the pressed function key, and the corresponding processing unit functions. do. After that, the control unit 33
Control is performed according to each process in accordance with the program stored in the data storage unit 31.

For example, when making the IC card 20 function as a telephone directory and registering telephone numbers, first, a function key device,
Press . Then, the mode switching processing section 33-6 causes the telephone number processing section 33-4 to function. Thereby, for example, the other party's telephone number is input using the ten keys of the first key input section 22. At this time, the first display section 24 and the second
The same content,
That is, the telephone numbers of the other parties are displayed.

Next, in order to register the name of the other party with that phone number, use the numeric keys rA'', ..., ``Z'', etc. of the second key input section 23. To do this, first turn the IC card 20 over and press 2. Press the lock key 23a. Then, the switch 23a-2 is turned on, the signal line L2 becomes low level, the clear terminal CLR is cleared, and the positive phase output terminal Q
The signal line L3 is at a low level, the opposite phase output terminals and the signal line L4 are at a high level, and the 3-state buffer 34b
-1 to 34b-n are opened, and the 3-state buffer 34a-
1-34a-n close. As a result, data input from the second key input unit 23 connected to bus C2 is valid (
permission). After that, press the numeric keypad "A", ..., "Z"
'' etc. to register the other party's name (including its abbreviation).

At this time, the first display section 24 and the second display section 25 have
The display drive unit 32 displays the same content, namely the telephone number and name of the other party.

In this way, the display driving section 32 is controlled by the control section 33 to perform display on the first display section 24 and the second display section 25, and the first key input section 22 is input into the data storage section 31. Also, the telephone number and name of the other party input using the second key input section 23 are stored.

As described above, by pressing the first lock key 22a and the second lock key 23a, the key input switching section 34 is switched, and the first key input section 22 or the second key input section 23 is switched. Either one becomes valid and the other becomes invalid, and the desired telephone number registration process is performed.

Similarly, by pressing the first lock key 22a or the second lock key 23a to enable/disable the first key input section 22 or the second key input section 23, the data storage section 31 is It is possible to inquire about a list of registered telephone numbers, and to inquire and write data in various other processes performed by the control unit 30.

This first embodiment has the following advantages.

(A) In the IC card 20, the first key input section 22 and the second key input section 23 are provided on both surfaces of the card base material 21, so compared to the conventional IC card 10, the number of keys that can be installed is The number can be increased. Therefore, even when adding application functions such as a telephone number registration function or a memo function, there is no need to provide multiple types of manual key functions to one key as in the past, and the operability related to selecting the manual key function is improved. It is possible to prevent the deterioration of the key mark, eliminate the unsightly appearance of the key mark, and improve usability.

(B) Since the IC card 20 is provided with the key input switching section 34, pressing the first lock key 22a and the second lock key 23a switches the key input section 22 or the second key input section 34.
It is possible to enable one of the key input sections 23 and disable the other.

Therefore, for example, by pressing the first lock key 22a,
By disabling the second key input unit 23, even if a key in the second key input unit 23 is pressed by mistake during manual key operation in the first key input unit 22, data can be input using that key. The same applies to the case where the second lock key 23a is pressed.

Therefore, the first key input section 22 and the second key input section 2
3, while increasing the number of keys, it is possible to prevent erroneous inputs due to unused keys, and improve reliability and usability.

(c) In the IC card 20, the first lock key 2 is inserted into the first key input section 22 and the second key input section 23, respectively.
2a and a second lock key 23a are provided, and the key input switching unit 34 is switched by pressing the first lock key 22a and the second lock key 23a.

Therefore, switching control of the key input switching section 34 can be performed reliably with a simple configuration.

<D) In the IC card 20, the first display section 24 and the second
Since the display parts 25 are provided on both surfaces of the card base material 21, the display contents can be displayed on the card base material regardless of whether the first key input part 22 or the second key input part 23 is used. It can be confirmed from both sides of the material 21.

FIG. 6 is a schematic circuit block diagram of an IC card showing a second embodiment of the present invention, FIG. 7(a).

(b) is a schematic external view of the IC card in FIG. 6;
Figure (a) is a plan view seen from one surface side, Figure (b)
is a plan view seen from the other surface side, and FIG. 8 is a circuit configuration diagram of the display switching section in FIG. 6.

In the figure, common elements with those in FIGS. 1 and 5 are given the same reference numerals. 9 is a schematic partial sectional view of the display section in FIG. 6, and FIG. 10 is a schematic perspective view of the solar cell in FIG. 6.

This IC card 40 has a card base material 41 made of, for example, plastic, metal, or the like. The card base material 4
1 includes a first key input section 22 similar to the IC card 20.
, a second key input section 23, a contact section 26, and an IC chip section 30 are provided, and furthermore, a display section 42, a display switching section 43, and a solar cell 44 functioning as a power supply section, which are the characteristics of this embodiment, are arranged. It is set up.

The display unit 42 is, for example, an LCD with a transmissive display structure,
The liquid crystal layer 42-1 is sandwiched between two transparent plates 42-4 made of glass or plastic, each having a transparent electrode layer 42-2 and a polarizing plate 42-3. External periphery is peripheral sealing material 42-5
It has a hermetically sealed structure. Here, display section 4
2 is different from a normal LCD and is configured without a reflective plate, so it has a double-sided display structure (in this case, the display by the same liquid crystal layer 42-1 can be seen from both sides of each transparent plate 42-5). Transparent display structure).

The display switching section 43 receives a common signal (hereinafter referred to as COM) input from the display driving section 32 via the bus C4.

Of the segment signals (hereinafter referred to as "SEG signals"), the COM signal is directly output to the wiring line of the transparent electrode layer 42-3 via the bus C43, and the SEG signal is output to the transparent electrode layer 42-3 of the display section 42. The 3-state buffers 43a-1 to 43a-n and 43.3 have a function of performing non-inversion or inversion conversion on the other wiring columns of 43. b-1~43b
-n.

The input side of each set of 3-state buffers 43a-1 and 43b-1, 3-state buffers 43a-2 and 43b-1, . . . 3-state buffers 43a-n and 43b-nf inputs the SEG signal via bus C4. 3-state buffers 43a=1 and 43b-n, 3-state buffers y43a-2 and 43b-[n-11, . . .
The output sides of each set of 3-state buffers 43a-n and 43b-1 are connected in common and connected to each wiring of the transparent electrode layer 42-3 via a bus C5.

Furthermore, the display switching section 43 connects the flip-flop 4 to J-.
It has 3c. Flip-flop 43c on this J-
is connected to the input terminal J connected to the power supply potential VCC, to the input terminal connected to the ground potential GND, and to the first lock key 22a via the signal line L1, similar to the flip-flop 34C. a clock input terminal CLK,
A clear terminal CLR is connected to the second lock key 23a via the signal line L2, and a positive phase output is connected to each control input terminal of the 3-state buffers 43b-1 to 43b-n via the signal line L5. It has a terminal Q and opposite phase output terminals connected to respective control input terminals of three-state buffers 4.3a1 to 43a-n via signal line L6.

The solar cell 44 is composed of a solar cell that can be used on both sides, and is laminated on two metal plates 44-1 and on both sides of the metal plate 44-1, so that it can receive light from both surfaces of the card base material 41. Amorphous silicon (hereinafter referred to as a-3i) semiconductor chips 44 arranged in
-2,443. Here, for example, the metal plate 4
4-1 is a negative electrode, a-8i semiconductor layer 44-2゜4
4-3 is set as a positive electrode.

Next, the operation when using the IC card 40 will be explained.

The IC card 40 includes an A-8I semiconductor layer 44 of a power supply section 44.
When both or one of -2 and 44-3 is irradiated with light, photo-electrical conversion occurs in the a-3i semiconductor layer 44-2, 44-3, power is obtained, and each part is driven. Then, using the IC card 40, the keys of the first key input section 22 and the second key input section 23 are manually operated and the first lock key 22a is operated in the same manner as the case of the IC card 20.
Various processes such as data inquiries and writing can be performed by the switching operation of the key input switching section 34 based on the operation of the second lock key 23a.

When performing various processes using this IC card 40, the display section 4
2 displays data as follows.

For example, when manually operating keys using the first key input section 22, if the first lock key 22a is pressed, the first key input section 22 becomes valid and data input using the second key input section 23 becomes invalid. However, this first lock key 22
By pressing a, the clock input terminal CLK of the flip-flop 43c falls from high level to low level at J- of the display switching unit 43, so the positive phase output terminal Q and signal line L5 become high level, and the negative phase output terminal Mutual and signal line L
6 becomes low level, 3-state buffer y43b-
1 to 43b-n are closed, and 3-state buffer 43a-
1 to 43a-n open. As a result, each SEG signal input from the display driver 32 via the bus C4 is input to the wiring row of the transparent electrode layer 42-2 corresponding to the 3-state buffers 43a-1 to 43a-n, and the COM signal is The signal is input as is to a predetermined wiring row of the transparent electrode layer 42-2. Thereby, the display on the display section 42 is performed in the normal display direction when viewed from the first key input section 22 side, and the display can be read by light from behind.

Next, when using the second key input section 23, when the second lock key 23a is pressed, only the second key input section 23 becomes effective due to the switching operation of the key input switching section 34. At the same time, since the signal line L2 becomes low level, J
-, the flip-flop 43c is cleared, the positive phase output terminal Q becomes low level, and the negative phase output terminals become high level. Then, 3-state buffer y4.3b-1~43b
-n opens and 3-state buffers 43a-1 to 43a
-n closes. Therefore, the signal line L4 is connected via the bus C4.
The SEG signals input to 3-1 to L43-n are in the order reversed horizontally from the wiring rows connected to the 3-state buffers 43a-1 to 43a-n via the 3-state buffers 43b-1 to 43b-n. Related transparent electrode layer 42
-2 is input to the wiring column. Therefore, when the second lock key 23a is pressed, the display on the display section 42 is reversed horizontally from the normal display direction when viewed from the second key input section 23 side, that is, the display direction when the first lock key 22a is pressed. This is done in the display direction, and the display can be read by light from behind.

This second embodiment provides advantages (A) to (D) in substantially the same way as the first embodiment. Furthermore, in this embodiment, since the display section 42 is configured using an LCD with a double-sided display structure, the display area can be increased without increasing the thickness of the card base material 41. In addition, in this embodiment, solar cells 44 are placed on both surfaces of the card base material 41 to serve as light receiving sections.
Since the structure is such that the 8i semiconductor layers 44-2 and 44-3 are arranged, the first key input section 22 and the second key input section 2
Power can be supplied by the solar cell 44 no matter which one of the three is used.

Note that the present invention is not limited to the illustrated embodiment, and various modifications are possible. Examples of such modifications include the following.

(I) The configuration and usage of the IC card 20.40, etc.
Variations are possible, examples of which are as follows.

(2) The functions, arrangement, circuit configuration, operating method, etc. of the keys of the first key input section 22 and the second key input section 23 are merely examples, and may be modified.

For example, the first lock key 22a, second lock key 22b, etc. may be configured with touch switches or the like.

■ The first display section 24 and the second display section 25 may be constructed of something other than an LCD with a reflective display structure, for example, a display device with a double-sided display structure, a display device with a light emitting element, etc. You may. Furthermore, by providing a switching means controlled by the operation of the first lock key 22a and the second lock key 23a, for example, it is possible to select which of the first display section 24 and the second display section 25 is used. It may be configured such that only the display section on the key input section side is displayed, and at that time the other display section is in a non-display state.

Further, the first display section 24 and the second display section 25 may be provided back-to-back in a stacked manner if the card base material 21 is thick. In that case, the display area can be secured.

The display unit 42 may be configured using a display device with a double-sided display structure other than an LCD.

(2) The contact section 26 can be installed or changed depending on the use of the IC card 20.40.

(2) In the ICC cheerleader 130, for example, the processing functions of the control unit 33, etc. can be changed as appropriate.

■ The key input switching section 34 has a 3-state buffer y, for example.
34a-1 to 34a-n and 34b-1 to 34b-n may be constructed from other logic gates or switching elements, or the flip-flop 34c may be constructed from another flip-flop. In this case, the connection relationships, logical level settings, etc. are changed as appropriate in accordance with the change.

In addition, the positive phase output terminal Q of the flip 70 tube 34 is connected to the control input terminal of the 3-state buffers 34a-1 to 34a-n to J-, and the negative phase output terminal Q is connected to the 3-state buffer y.
By connecting to the control input terminals of 34b-1 to 34b-n, when the first lock key 22a (or second lock key 23a) is pressed, the first key input section 22 (
Alternatively, the second key input section 23) may be disabled and the second key input section 23 (or first key input section 22) may be enabled. In this case, for example, when the input operation on the first key input unit 22 is completed, the lock key 2
2a, then turn over the IC card 20 (or 40) and perform the input operation on the second key input section 23.

(2) The power supply unit 35 may be constructed of, for example, a solar cell that can be used on one side or on both sides. In addition, the solar cell 44
may be constructed in place of two ordinary solar cells arranged back to back.

Furthermore, as a power supply section of the IC card 40, a solar cell 4
4 or the like, it may be configured using a primary battery, a secondary battery, etc. other than a solar battery.

■ The display switching section 43 has a 3-state buffer 43a-1.
43a-n, 43b-1 to 43b-n, and J-, the configuration of the flip-flop 43c, etc. can be changed. Furthermore, in the first and second embodiments described above, the first key input section 2
2 and the second key input unit 23 are such that the key marks are aligned in the vertical direction, and the IC cards 20 and 40 are rotated laterally and turned over for use. The first key input section 22 and the second key input section 23 may be arranged so that the vertical directions are opposite, and the IC card 20.40 may be used by rotating it vertically and flipping it over. For example, when the IC card 40 is configured in this manner, the display switching unit 43 may invert the display content of the display unit 42 vertically by pressing the first lock key 22a and the second lock key 23a. .

That is, for example, the display switching section 43 may be configured to output the SEG signal as is, and invert the input string of the COM signal. In addition, the display switching unit 43 is set so that the display content is reversed horizontally by the inversion of the SEG signal, for example, but the display content is reversed horizontally by the COM signal, and the display content is reversed vertically by the SEG signal. It may be configured to do so.

(2) Since the J- flip-flops 34c and 43c each have the same function, it may be configured such that only one of them serves the same purpose.

(II) The functions and circuit configuration of the IC card 20.40 can be changed depending on the application, and other functions and circuit configurations can be added accordingly. Furthermore, for example, identification data such as embossing may be provided on the card base materials 21 and 41.

Further, the explanation of the operation in the above embodiment is merely an example, and the operation related to the processing functions of the IC card 20.40 can be modified in various ways.

(Effect of the invention) As explained in detail above, according to the first invention, the first
By providing the second key input section, the number of keys can be increased without impairing operability. Further, by providing first and second lock keys in the first and second key input sections, respectively, and providing the key input switching section, enabling/disabling of the first and second key input sections can be performed. Switching can be performed to prevent erroneous inputs caused by keys in unused key input sections.

Therefore, according to the first invention, it is possible to easily add application functions such as a memo function and a telephone number registration function without impairing operability, and it is possible to easily add application functions such as a memo function and a telephone number registration function.
C card can be realized.

According to the second invention, in addition to the effects of the first invention, it is possible to secure the display area of the display section without increasing the thickness of the card base material.

According to the third aspect of the invention, the power source section is configured with a solar cell, which saves the trouble of replacing batteries, but the light receiving section of the solar cell is configured to be able to receive light from both surfaces of the card base material. Since the structure is such that they are provided on both surfaces of the card base material, light can always be received and power can be supplied regardless of whether the first or second key input section is used.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an IC card showing a first embodiment of the present invention, and FIGS. 2(a) and 2(b) are external views of a conventional IC card. (b) is a perspective view seen from the surface side of the other side;
Figures (a) and (b) are external views of the IC card shown in Figure 1, where (a) is a plan view seen from one front side, and (b)
) is a plan view seen from the other surface side, FIG. 4 is a functional block diagram of the control section in FIG. 1, FIG. 5 is a circuit configuration diagram of the key input switching section and lock key in FIG. 1, and FIG. The figure is a circuit block diagram of an IC card showing a second embodiment of the present invention.
Figures (a) and (b) are external views of the IC card shown in Figure 6.
) is a plan view seen from the other surface side, FIG. 8 is a circuit configuration diagram of the display switching section in FIG. 6, FIG. 9 is a partial sectional view of the display section in FIG. 6, and FIG. It is a perspective view of the solar cell in a figure. 20.40... IC card, 21.41... Card base material, 22... First key input section, 23... Second key input section, 22a... First lock key , 23a・
...Second lock key, 24...First display section, 25
...Second display section, 30...IC chip section, 31.
...Data storage section, 32...Display drive section, 33...
Control unit, 34... Key input switching unit, 35... Power supply unit, 42... Display unit, 43... Display switching unit, 44...
・Solar cell, 44-1...Metal plate, 44-2.44-
3-=a-8i semiconductor layer.

Claims (3)

[Claims] 1. A key input section for inputting data, a display section for displaying data and its display drive section, a data storage section for storing programs and data, and control of the key input section, display section, display drive section, and data storage section. and a power supply section that supplies power to the key input section, the display section, the display driving section, the data storage section, and the control section, the card base material is provided with: a first key input section disposed on one surface of the card base material and having a first lock key; and a second key input section disposed on the other surface of the card base material and having a second lock key. The display section includes a first display section disposed on the same surface as the first key input section, and a second display section disposed on the same surface as the second key input section. and a key for switching between validating one of the data inputs of the first or second key input unit and invalidating the other by operating the first or second lock key. An IC card characterized by being provided with an input switching section. 2. 2. The IC card according to claim 1, wherein the display section has a double-sided display structure that displays on both surfaces of the card base material, and the display section is configured to display on both surfaces of the card base material based on the operation of the first or second lock key. An IC card equipped with a display switching section that switches the display direction corresponding to the switching operation of the key input switching section. 3. The IC card according to claim 1 or 2, wherein the power source section is constituted by a solar cell having light receiving sections on both surfaces of the card base material.