JPH11245564A - Repeatedly usable business card and method for using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a business card which avoids to waste resources and is easily renewed and can be repeatedly used and furthermore, can prevent that the latest card information can not be discriminated caused by existence of cards for the same person but different posts and titles when the cards are adjusted from occurring. SOLUTION: This business card 1 is constituted of a liq. crystal/polymer composite film in which liq. crystal particles are dispersed in a polymer matrix as a display element 4 and as writing is performed in the display element 4 by recording and displaying individual informations 6 in the display element 4, i.e., putting orientation condition of the liq. crystal in the liq. crystal/polymer composite film in disorder by the action of heat and erasing is performed by changing the orientation condition of the liq. crystal by the action of electric field to make the card repeatedly usable, wasting resources is avoided and renewal is easy. In addition, as there exists a terminal display part with a receiving function for receiving that the individual informations are changed, it is possible to surely know the changes in the individual informations of the card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reusable business card using a rewritable reversible display element having a response to an electric field or heat as a recording display medium and a method of using the same. .

[0002]

2. Description of the Related Art Hitherto, business cards have been widely used as means for clarifying their names, company names, affiliations, statuses, addresses, and the like to a first-time meeting partner. A business card is usually made by letterpress printing or offset printing of the above-mentioned necessary items and the like on a relatively thick paper to make the size and weight easy to carry. Even if the department or title changes due to a change in the personnel organization, or if only the part displayed on the business card is changed, all the business cards that have been used until then are generally discarded. .

[0003]

In the above business card, the amount of waste per person is not so large, but the amount of waste in Japan is extremely large, which is incinerated and landfilled. Considering the current situation, throwing away business cards is a waste of resources. Also, when the person who received the business card organizes many business cards, if there is a same person with different departments and titles, it is not possible to determine which is the latest business card, or write it on the business card. There are problems such as the telephone number being changed and the correct telephone number being unknown.

Accordingly, it is an object of the present invention to provide a business card which can be used repeatedly without reusing resources, and which can be repeatedly used. To provide a business card that can prevent the latest business card information from being discriminated due to the presence of different business titles and titles, and the fact that the telephone number described on the business card has been changed and the correct telephone number cannot be determined. .

[0005]

The above object is achieved by the present invention described below. That is, in a business card that can be used repeatedly, the display element is formed of a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix, and personal information is recorded and displayed on the display element. And
It is preferable to have a terminal having a function of receiving notification that personal information has been changed. Further, it is preferable that the writing and erasing of the personal information to be written into and erased from the display element in one of the heat and the electric field and the other in the other is reversible. Further, according to the present invention, in the method for using a business card which can be used repeatedly, the display element is formed of a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix, and personal information is recorded and displayed on the display element. On the display element, personal information is recorded and displayed by one of heat and electric field,
The information is erased by the other side, and recording and erasing are reversible.

Further, the method of using the business card is such that in a complex system in which a personal information system and a wireless calling system are connected by a line, the personal information system includes a personal information transmission request receiving means, a personal information storage means, and personal information. The personal information box to be stored and which wireless call number corresponds to the business card corresponding to the personal information, a storage unit for storing the corresponding information stored therein, and a notification unit to the wireless call system. The system has a wireless call request receiving unit and a wireless call unit, and the personal information transmission request receiving unit of the personal information system has changed the destination information specified in the business card corresponding to the personal information. Accepts personal information and sends it to the personal information storage means, the personal information storage means corresponding to a business card corresponding to the personal information indicated by the destination information Storing the personal information in the personal information box, and further sending the destination information to the notifying means to the wireless paging system, wherein the notifying means to the wireless paging system stores the corresponding information in the storing means of the corresponding information. By examining, the wireless call number of the business card corresponding to the personal information indicated by the destination information is extracted, and the wireless call number and information indicating that the personal information has been changed are received by the wireless call request of the wireless call system. The wireless call request receiving means sends the wireless call number and information indicating that the personal information has been changed to the wireless call means, and the wireless call means sends the wireless call request to the wireless call request. It is preferable and preferable to call a terminal having a reception function indicated by a number and to display on the terminal that the personal information has been changed.

[0007]

The business card used in the present invention is used as a display element.
Liquid crystal with liquid crystal particles dispersed in polymer matrix /
It is composed of a polymer composite film, and the personal information is recorded and displayed on the display element, that is, the alignment state of the liquid crystal of the liquid crystal / polymer composite film is disturbed by the action of heat and is written on the display element, and the action of the electric field is performed. By changing the alignment state of the liquid crystal in the above, the liquid crystal is erased and can be used repeatedly, so that waste of resources is eliminated and rewriting is easy. Further, the business card of the present invention not only has a display element but also has a terminal having a function of receiving that the personal information has been changed, so that the change of the personal information of the business card can be surely known, and the change can be made. The content can be rewritten as a business card.

[0008]

Next, the present invention will be described in more detail with reference to preferred embodiments. FIG. 1 is a schematic diagram showing an example of a business card that can be used repeatedly according to the present invention. Reference numeral 1 denotes a business card, 2 denotes a substrate, 3 denotes an electrode layer, 4 denotes a display element, and 5 denotes a protective layer. The display element 4 is composed of a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix, and personal information 6 is recorded and displayed on the display element 4. Writing and erasing of personal information 6 on the display element 4
For example, this is performed using an apparatus having a writing unit and an erasing unit.

As shown in FIG. 3, for example, a business card having such a configuration includes a writing unit 8 provided with printing means such as a thermal head 10 and an erasing unit 9 provided with, for example, an electric field applying means. And writing and erasing are performed. By repeating the operation of writing and erasing, the new creation of the business card 1, the partial correction of the display, and the update of the display can be repeatedly performed. Further, as shown in FIG. 2, the business card which can be used repeatedly comprises a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix, and a display element on which personal information 6 is recorded and displayed. 4 and a terminal 7 having a function of receiving a notification that the personal information 6 has been changed.

Next, a liquid crystal / polymer composite film (P) comprising liquid crystal particles dispersed in a polymer matrix, which can be used repeatedly,
DLC film: Polymer Dispersed Li
A reversible display element composed of a liquid crystal (quid Crystal film) will be described. The principle of writing (recording) / erasing visible information on a reversible display element composed of a PDLC film uses light transmission and light scattering in the alignment state of liquid crystal molecules by heat and an electric field (heat-electric field mode) and in a random alignment state. I do.
Therefore, the recorded information is displayed as white turbid light due to light scattering (when dichroic dye is used, colored light due to the dye).
When erasing is performed by transparency by light transmission, printing (writing) is performed by a heating means such as a thermal head that can be heated in a spot manner, and erasing is performed by, for example, PD.
This can be performed by sandwiching the LC film between the electrodes and applying an electric field equal to or higher than the threshold value of the liquid crystal alignment.

In the PDLC film, the liquid crystal is μs by applying an electric field.
ec. Since the orientation is performed in the order, it is possible to perform a high-speed rewriting process as compared with various reversible display devices in a conventional heat-heat mode, and is suitable as a reusable business card of the present invention. The number of rewrites is sufficient, the visibility is good by using a dichroic dye in combination, the display is hard to disappear in a natural environment, and the display reliability is high. Examples of the liquid crystal material used in the present invention include conventionally known nematic liquid crystals, smectic liquid crystals, discotic liquid crystals, mixed liquid crystals thereof, and polymer liquid crystals. Even after the external energy for aligning the liquid crystal is removed, it is preferable to use a smectic liquid crystal as a material having a memory property in which the alignment state of the liquid crystal is maintained and a display is stored for a long time.

As the smectic liquid crystal, any conventionally known smectic liquid crystal can be used. These smectic liquid crystals preferably have a wide temperature range exhibiting a nematic phase, and in the present invention, the use of a smectic liquid crystal material having a temperature range exhibiting a nematic phase of 1 ° C. or more makes the PDLC film transparent. Can be. A dichroic dye may be mixed in the smectic liquid crystal at a ratio of, for example, 1 to 10 parts by weight per 100 weight of the smectic liquid crystal for the purpose of improving the contrast ratio or coloring. In this case, the dichroic dye to be mixed into the liquid crystal is not particularly limited, and any of an azo type, a perelin type, an anthraquinone type and the like can be used, and a dichroic color having a color suitable for the display content of a business card can be used. Dyes are used in combination with liquid crystals and matrix materials.

As the polymer material forming the polymer matrix in which the liquid crystal particles are dispersed, any polymer material which is not compatible with the liquid crystal and which is excellent in transparency and film formation can be used. Specifically, suitable polymer materials according to the method of forming the PDLC film, for example, vinyl chloride resin, vinyl chloride resin such as vinyl chloride-vinyl acetate copolymer, vinylidene chloride resin such as vinylidene chloride, polyvinyl alcohol resin, Examples include epoxy resins, polycarbonate resins, polyester resins, polyamide resins, acrylic resins such as polyacrylates, polymethacrylates, and acrylate-methacrylate copolymers, polythiol resins, and polyurethane resins. Further, an ionizing radiation-curable resin composed of an acrylic monomer, a polymerizable prepolymer, or the like may be cured with ionizing radiation such as an ultraviolet ray or an electron beam.

As a method for dispersing the liquid crystal particles in the polymer matrix, any of the conventionally known methods such as a phase separation method and an emulsion method can be used. The method useful in the present invention is the phase separation method. . In the phase separation method, a solution containing the above components is prepared using an organic solvent capable of dissolving a polymer matrix, a liquid crystal composition, and other additives, and the solution is applied to an appropriate substrate surface. This is a method of forming a target liquid crystal / polymer composite film by evaporating, and according to this method, a PDLC film in which liquid crystal particles are uniformly dispersed in the formed film is formed.

Suitable solvents include, for example, acetone, methyl ethyl ketone, toluene, xylene, tetrahydrofuran, chloroform and the like. The solid content of these solvents is preferably in the range of about 5 to 30% by weight. . As a method of forming a PDLC film, a method of applying the liquid crystal particle dispersion on a substrate and drying the liquid is preferable. Examples of the coating method include an electrodeposition method, a screen coating, a blade coating, a knife coating, a slide coating, an intrusion coating, a foundry coating and the like. The thickness of the composite film thus obtained is preferably about 3 to 23 μm. If the film thickness is too small, light scattering (turbidity) at the time of heating becomes insufficient, and if the film thickness is too large, a large driving voltage is required for alignment of the liquid crystal.

The conductive substrate on which the PDLC film is applied is a substrate generally used for a conventionally known liquid crystal element. For example, a transparent conductive material such as ITO, SnO ₂ , and ZnO is used. PET (polyethylene terephthalate)
And an electrode substrate attached to a transparent substrate such as a polymer film. On the other hand, in the case of an opaque conductive substrate, its electrode is also required to function as a reflection plate, and thus, for example, a substrate provided with an aluminum reflection electrode is preferable. The substrate itself may be a polymer film or other.

Further, a transparent conductive material such as ITO, SnO ₂ or ZnO may be attached to a reflection plate such as a white PET film. Further, a reflection plate formed by forming a reflection layer made of Al ₂ O ₃ , TiO ₂ , ZnO or the like on a polymer film may be bonded to the surface of the transparent conductive substrate opposite to the PDLC film. After forming the liquid crystal / polymer composite film on the electrode substrate as described above, the liquid crystal / polymer composite film is formed by drying at room temperature or at a temperature that does not affect the liquid crystal particles. The thickness of the liquid crystal / polymer composite film is
Generally, it is about 3 to 23 μm, and if it is less than 3 μm, the contrast of display becomes low, and if it exceeds 23 μm, the driving voltage becomes high, which is not preferable.

The recording / display medium which is a business card of the present invention uses at least a PDLC film and means for applying an electric field perpendicularly to the film. As this means, both surfaces of the PDLC film may be sandwiched by electrodes, but from the viewpoint of applying an electric field to an arbitrary portion, only the back surface may be used as an electrode, and the front surface may be an external electrode. A polymer film is particularly suitable as the electrode substrate. As the film, a white polyethylene terephthalate (PET) film is desirable. The conductive layer is IT
In addition to a transparent conductive material such as O, a metal such as aluminum can be used. In the case of a metal electrode, a colorless PET film may be used as the film. Accordingly, the business card of the present invention comprises at least a flexible substrate serving as a support, an electrode (conductive layer), and a PDLC film, and has heat resistance, friction resistance, and scratch resistance to a thermal head or the like as a heating means if necessary. A protective layer can be appropriately provided on the PDLC film in order to impart such properties.

P formed on a transparent or reflective conductive substrate
When a protective layer is formed on the surface of the DLC film, the polymer material for forming the protective layer has excellent adhesion to the PDLC film and can form a transparent film, and has a refractive index of PDLC film. Any polymer material can be used as long as the difference is 0.05 or less as compared with the refractive index of the matrix forming polymer material. For example, a (meth) acryloyl group is contained in a molecule of a thermosetting resin, an ultraviolet curable resin, or an electron beam curable resin, specifically, polyene thiols, urethane acrylate, epoxy acrylate, silicone acrylate and the like. Known curable resins composed of monofunctional or polyfunctional monomers such as polymerizable acrylate polymers and methyl methacrylate, and the like are included.
When the protective layer film cannot be formed directly on the liquid crystal / polymer composite film, an intermediate layer may be provided between the composite film and the protective layer.

The protective layer formed on the surface of the PDLC film preferably has a smooth surface and a difference between the refractive index of the protective layer and the refractive index of the polymer matrix is 0.05 or less.
If the difference exceeds 0.05, the difference between the refractive index of the liquid crystal and the refractive index of the protective layer when a voltage is applied becomes large, so that light scattering is increased and the contrast is reduced. More preferably, it is 0.03 or less. The surface roughness (Ra) of the obtained protective layer is preferably less than 0.1 μm. When the average roughness is 0.1 μm or more, light is scattered on the surface of the protective layer, and the contrast is reduced.

As a method of forming the protective layer, for example, PDL
As a solution in which the polymer material for forming the protective layer is dissolved in a solvent that does not dissolve the C film, or as an emulsion of an appropriate medium, PDL
A film is formed by polymerization in the same manner as in the formation of the C film. After applying the monomer as described above to the PDLC film surface, the monomer is converted into a polymer by appropriate means (heating, electron irradiation, etc.), and the polymer is cured. A method of forming a monomer layer and transferring and laminating it on the composite film surface (in the case of a monomer layer, polymerizing and curing at the time of transfer or after transfer) and the like can be mentioned. The thickness of the formed protective layer is preferably in the range of 1 to 5 μm.

As for the formation of the intermediate layer, an intermediate layer composed of a resin similar to the above-mentioned polymer matrix and a thermosetting resin, an ultraviolet curable resin or an electron beam curable resin, for example, polyene-thiols, urethane acrylate, epoxy acrylate An intermediate layer made of a known curable resin or the like made of a monofunctional or polyfunctional monomer such as a polymerizable acrylate having a (meth) acryloyl group in a molecule such as a silicone acrylate may be provided.

The amount of the liquid crystal to be used is usually such that the mixing ratio (weight ratio) of the polymer matrix forming material / the liquid crystal is 65/35.
A range of ~ 35/65 is desirable. If the amount of the liquid crystal used is too small, not only is the transparency of light at the time of applying a voltage insufficient, but also a large voltage is required in order to make the film transparent, which is not preferable. If the amount is too large, not only is light scattering (turbidity) at the time of heating insufficient, but also the strength of the film is undesirably reduced.

The recording / display medium made of the PDLC film obtained as described above is used as a business card as it is, or after giving a more attractive decoration such as fitting it into an appropriate frame. FIG. 3 shows a recording display medium 1 made of a PDLC film.
FIG. 2 shows a schematic configuration diagram of an example of a writing unit 8 and an erasing unit 9 when writing and erasing (business card). The writing unit 8 is provided with a thermal head 10 facing the platen roller 11. Thermal head 10
Receives a predetermined signal and performs writing. The erasing unit 9 includes a power supply 13 for supplying a predetermined voltage to the charger 12 and an opposing roller 15 opposed to the ground roller 14 for ensuring the contact of the processing surface. The recording display medium 1 erases recorded information by applying a voltage, and records information by heating. The charger 12 is a corona charger having a tungsten wire connected to a power supply inside. Also, the ground roller 14 and the power supply 13 are grounded,
A potential difference is generated between the surface of the recording display medium 1 charged by the charger 12 and the contact surface with the ground roller 14, whereby an electric field is applied in the vertical direction of the recording display medium.

As the charger, a conventionally known corotron charger, scorotron charger and the like can be used. As the ground roller, a roller made of plastic or rubber mixed with a conductive material such as metal or conductive carbon black can be used. Particularly preferred is a roller made of an elastic material such as rubber. Both the electric field applying means (charging device) and the thermal head can be used for writing and erasing information, but by using the electric field applying means for erasing, the display is not erased by heat in a natural environment, and the display reliability is excellent. Can be displayed.

The electric field applying means of the erasing unit is not limited to the above method.
Any of electric field applying means such as a charging method described in Japanese Patent Application No. 49 and Japanese Patent Application No. 6-302701 and an electrode method described in Japanese Patent Application No. 6-30270 can be used. As the writing unit, a thermal head used in a thermal printer is used. Note that a laser heating means can be used as the heating for writing.

(Method of Using Business Card That Can Be Used Repeatably) A method of using a business card that can be used repeatedly according to the present invention will be described. The method of using a business card that can be used repeatedly is to write and record and display personal information in either the heat or the electric field on the display element of the business card and erase it on the other side. Writing and erasing of personal information is reversible. It is typical. To erase information, an electric field is applied to the entire surface of the liquid crystal / polymer composite film, and the information is written by heat. This is repeated to rewrite information. Alternatively, to erase information, apply heat to the entire composite film,
Thereafter, information is written by an electric field. Repeat this,
Rewrite information. When an electric field is applied, if the liquid crystal / polymer composite film is heated, it is expected that the disturbance of the alignment of the liquid crystal molecules will occur in a short time and sufficiently. As a method for applying an electric field, a corona charging method is particularly effective. As a method for applying heat, a method using a thermal head is preferable.

On a display element comprising a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix, personal information is recorded and displayed by heat, the information is erased by an electric field, and the personnel organization is transferred. Changes in departments and titles,
When personal information such as a postal code change or address change is changed, it is preferable to adopt the following business card usage method. As shown in FIG. 4, the personal information transmission request receiving unit 18 changes the department or title due to a change in the personnel organization,
When the postal code or address display is changed and the changed personal information is input to the destination information specified in the business card 1 corresponding to the personal information to be changed, the destination information and the personal information are transferred to the personal information. It is sent to storage means 19.

The personal information storage means 19 stores the personal information in the personal information box 20 of the business card indicated by the destination information, and sends the destination information to the notifying means 21 for the wireless calling system. The notification means 21 to the wireless call system determines which wireless call number the business card 1 indicated by the destination information has based on the contents of the corresponding information storage means 22, and determines the wireless call number and “personal information”. The message “change” is transferred to the wireless calling system 17 via the line 24.

Upon receiving the wireless call number and the message of "Personal information change" from the notifying means 21 to the wireless call system, the wireless call request receiving means 25 wirelessly sends the wireless call number and the "Personal information change" message. It is sent to the calling means 26. The wireless calling unit 26 wirelessly calls the terminal 7 having the function of receiving the business card 1 indicated by the received wireless calling number, and transmits the received “personal information change” message to the terminal 7 having the wireless receiving function. Terminal 7 having reception function
Responds to the radio signal from the radio calling means 26, rings the bell, and displays a message "Personal information change" on the terminal display unit.

The terminal 7 for displaying the message has a wireless receiving function. The display method is the same as that of a conventional liquid crystal display used for a pager or the like, or a polymer matrix of a business card of the present invention. A display element composed of a liquid crystal / polymer composite film in which liquid crystal particles are dispersed may be used.
However, when this liquid crystal / polymer composite film display element is used, an apparatus as shown in FIG. 3 is required. In this case, the display element 4 for recording and displaying personal information is a terminal having a reception function. 7 may also serve as the display unit.

The recipient of the business card 1 having the terminal 7 having a receiving function, by sounding the bell and displaying the message,
Understand that personal information on business cards has changed. Then, the details of the change of the personal information are sent to, for example, the company of the person described on the business card corresponding to the personal information, and the personal information extracting means 23 for the business card corresponding to the personal information is stored in the personal information storage means 19. Using the erased unit 9 and the writing unit 8, the changed information of the personal information is erased and written on the repeatedly usable business card 1,
Change personal information on business cards.

In the above-mentioned method of use, instead of the message "change of personal information", the changed content of the personal information itself, for example, a change in the department or title, a change in postal code or address, etc. A terminal capable of converting information into a message and rewriting and displaying changes in personal information on a display element of a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix of a business card, or having a receiving function. Can display the change of personal information.

In the method of using a business card of the present invention,
Because it is a business card that can be used repeatedly, it is easy to modify and update the personal information of the business card, and if the personal information received from the other party is taken as data in the electronic notebook or other machine It is also possible to erase the business card and rewrite it to a business card recorded and displayed with its own personal information using a writing device.

[0035]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In the following description, parts and% are based on weight unless otherwise specified. Further, the present invention is not limited to these. (Example 1) A dichroic dye (manufactured by Nippon Kogaku Dyeing Co., Ltd., G241 / G2) was added to 2 parts of a smectic liquid crystal (manufactured by Japan Energy Co., Ltd., M90054, SN transition point 100 ° C.).
06 / G472, weight ratio 4/4/3) was added. 3.0 parts of polymethyl methacrylate (PMMA, manufactured by Soken Chemical Co., M1002B, average molecular weight 300 to 550,000) and a solvent (toluene / methyl ethyl ketone / ethyl acetate)
The above liquid crystal composition was added to 30 parts of a solution consisting of 27 parts and stirred at room temperature for 10 hours to obtain a solution.

Using this solution, a liquid crystal / polymer composite film having a thickness of 4 μm was formed by applying the solution on an ITO-deposited white PET substrate and drying it. Furthermore, after applying an ultraviolet-curing resin (urethane acrylate) to the entire surface of the liquid crystal / polymer composite film, it is cured by irradiating ultraviolet rays with a high-pressure mercury lamp (output: 120 W / cm ² ) to form a protective layer having a thickness of 2 μm. The business card used in the present invention was used. A business head composed of a milky white opaque liquid crystal / polymer composite film obtained in this manner is provided with a thermal head (head resolution: 6 dots / mm, heating amount 0.4 mJ / dot) and an apparatus equipped with a corona charger as an erasing unit was used.

As a result of connecting a thermal head to a personal computer and outputting the character information input to the personal computer to a business card passing through the above device,
Vivid black characters were displayed. Next, the business card on which the characters are displayed is passed through the above display device, and when an electric field is applied by the corona charger of the erasing unit, the liquid crystal / polymer composite film becomes transparent, and the business card passing through the erasing unit becomes milky white and opaque again and is displayed. The characters have been completely erased. Display and erasing were repeated again in the same manner as above, but the above results were reproduced.

Example 2 Using the same material of the liquid crystal / polymer composite film used in Example 1, a display element was formed on an ITO-deposited white PET substrate as shown in FIG.
And dried. In addition, a terminal having a function of receiving a notification that the personal information has been changed is disposed on the board in the arrangement shown in FIG. A liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix obtained as described above is provided. The display element on which personal information is recorded and displayed, and a function of receiving a notification that personal information has been changed are provided. The same writing unit and erasing unit as in Example 1 were used to display and erase a business card with a terminal having the same terminal, and clear black characters were displayed, and the displayed characters were completely erased. . Further, the business card according to the second embodiment is provided with a terminal having a function of receiving the notification that the personal information has been changed, so that the change in the personal information of the business card can be reliably known, and the details of the change are stored in the business card. Could be rewritten.

[0039]

As described above, according to the present invention, the business card used in the present invention is composed of a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix as a display element. Is written on the display element by recording and displaying on the display element, that is, by disturbing the alignment state of the liquid crystal of the liquid crystal / polymer composite film by the action of heat, and changing the alignment state of the liquid crystal by the action of an electric field. Since the data is erased and can be used repeatedly, resources are not wasted and rewriting is easy. Further, the business card of the present invention not only has a display element but also has a terminal having a function of receiving that the personal information has been changed, so that the change of the personal information of the business card can be surely known, and the change can be made. The content can be rewritten as a business card.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of a business card that can be used repeatedly according to the present invention.

FIG. 2 is a schematic diagram showing an example of a business card that can be used repeatedly according to the present invention.

FIG. 3 is a schematic configuration diagram showing an example of a writing unit and an erasing unit when writing and erasing a business card that can be used repeatedly according to the present invention.

FIG. 4 is a block diagram showing an example of a method for using a business card that can be used repeatedly according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Business card (recording display medium) 2 Substrate 3 Electrode layer 4 Display element 5 Protective layer 6 Personal information 7 Terminal with receiving function 8 Writing unit 9 Erasing unit 10 Thermal head 11 Platen roller 12 Charger 13 Power supply 14 Installation roller 15 Opposite roller Reference Signs List 16 Personal information system 17 Wireless calling system 18 Receiving means of personal information transmission request 19 Personal information storing means 20 Personal information box 21 Notification means to wireless calling system 22 Corresponding information storage means 23 Personal information extracting means 24 Line 25 Wireless calling request Receiving means 26 wireless calling means

Claims (7)

[Claims] A display card comprising a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix, wherein personal information is recorded and displayed on the display element. . 2. The reusable business card according to claim 1, further comprising a terminal having a function of receiving a notification that the personal information has been changed. 3. The display device according to claim 1, wherein personal information is written in one of heat and electric field, and writing and erasing of personal information to be erased is reversible.
Or a business card that can be used repeatedly as described in 2. 4. The business card according to claim 1, wherein the liquid crystal is a smectic liquid crystal. 5. The reusable business card according to claim 1, wherein the liquid crystal contains a dichroic dye. 6. A method of using a repeatedly usable business card for recording and displaying personal information on a display element comprising a liquid crystal / polymer composite film in which liquid crystal particles are dispersed in a polymer matrix. The use of a business card that can be used repeatedly, wherein personal information is recorded and displayed on the display element by one of heat and an electric field, and the information is erased by the other, and recording and erasing are reversible. Method. 7. In a complex system in which a personal information system and a wireless calling system are connected by a line, the personal information system receives a personal information transmission request, a personal information storage means, and a personal information box for storing personal information. And a wireless call number corresponding to the business card corresponding to the personal information, a storage means for storing the stored correspondence information, and a notification means to the wireless call system, and the wireless call system receives a wireless call request. Means, and a wireless calling means, the personal information transmission request receiving means of the personal information system receives the destination information specified in the business card corresponding to the personal information, and changed personal information, The personal information storage means sends the personal information to the personal information box corresponding to the business card corresponding to the personal information indicated by the destination information. Information, and further sends the destination information to the notifying means to the radio paging system. The notifying means to the radio paging system checks the correspondence information in the correspondence information storage means, and The wireless call number of the business card corresponding to the indicated personal information is taken out, and the wireless call number and information indicating that the change of the personal information has been received are sent to the wireless call request receiving means of the wireless call system, The wireless call request receiving means sends the wireless call number and information indicating that the personal information has been changed to the wireless call means, and the wireless call means has a receiving function indicated by the wireless call number. 7. The repeatable name according to claim 6, wherein the terminal is called and a message indicating that personal information has been changed is displayed on the terminal. How to use.