JP2009125995A - Card and ic card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a card and an IC card in which visible or invisible display is possible by a low-cost, simple device constitution, and which is suitable for judgement of truth or falsehood. <P>SOLUTION: The card applies an electric field to a space between confronted electrodes, mounts a plurality of display devices performing image display in accordance with the reversible change of a substance between the electrodes, connects antennas with the respective display devices, feeds electric power by electromagnetic induction or electromagnetic coupling in a non-contacted state, and displays latent image visible or invisible in accordance with whether there is the application of an electric field or not. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a new image display method and a card using the same, and more particularly to a card suitable for authenticity determination.

  In recent years, with the spread of IC cards, each individual owns a plurality of cards. In addition to bank cards and credit cards, IC cards give electronic money instead of cash, such as charging cash and purchasing things, and giving a certain percentage of points to the amount purchased at stores. , Has become a function as a point card that plays the same role as money in the store.

  When it comes to functions as electronic money and point cards, it is difficult to remember how much money or points are in the card, and a display function is required, as a conventional display means, Display using a reversible thermosensitive recording layer and display using a magnetic powder layer have been performed (for example, see Patent Document 1). However, in order to display information in the IC chip, a separate magnetic writing device or thermal recording device is required, or internal information is always displayed, which is not preferable from the viewpoint of security.

  As such electronic information browsing means, it is known to use a liquid crystal display, an LCD, an organic LED, a variable display device used in an electronic paper or a flexible display, etc. that is displayed using electricity for a card (for example, a patent) Reference 2).

However, since it is variably displayed, it has not been considered as an application for preventing counterfeiting such as security and authenticity determination. In addition, if display control is performed for each pixel of high image quality, high resolution, and full color, parts become expensive, an IC chip is required for control, an operation system, etc. are required, resulting in high cost, power consumption Consumption increased, thickness increased, and durability decreased, making it difficult to mount on cards, tags, tickets, and the like.
JP 2005-107658 A Japanese Patent Laid-Open No. 10-162111

  An object of the present invention is to provide a card and an IC card suitable for authenticity determination that can be displayed in a visible or invisible manner with a simple apparatus configuration at low cost.

  The above problem could be solved by the following configuration.

  1. Equipped with multiple display elements that display an image by applying an electric field between the opposing electrodes and reversibly changing the substance between the electrodes, connecting antennas to the display elements, respectively, and supplying electric power without contact by electromagnetic induction or electromagnetic coupling A card that is supplied and displayed in a visible or invisible manner depending on whether or not an electric field is applied.

  2. The at least one display element comprises a pair of electrodes, forms an irreversible latent image on the display element, and displays the latent image in a visible or invisible manner depending on whether or not an electric field is applied. Card as described in

  3. 3. The card according to 1 or 2, wherein a plurality of display elements have different resonance frequencies for electric field application.

  4). An IC card in which an IC capable of reading and writing by non-contact communication is mounted on the card according to any one of 1 to 3, wherein the resonance frequency of an antenna of at least one display element and reading and writing of the IC are performed. An IC card having the same frequency as a resonance frequency of an antenna to be performed.

  The card of the present invention has a plurality of display elements, the display elements are display elements that display an image by applying an electric field between opposing electrodes and reversibly changing the substance between the electrodes. By connecting individual antennas, different latent images are visualized by electromagnetic fields in a frequency band that is not known in advance, so that it is possible to further increase security.

  By providing an IC on the card, a large amount of information can be recorded, and a high-security multifunction card can be formed with a single card.

  By having a plurality of display elements and connecting individual antennas to the display elements, it is possible to form a card with high security by displaying different latent image information.

  Hereinafter, the present invention will be described in more detail.

  FIG. 1 is a sectional view showing the structure of a display element used in the card of the present invention.

  The display element 1 is composed of a pair of electrodes 2 and 3 facing each other. In other words, the display element used in the present invention preferably has an element surface made up of a pair of solid electrodes. Thereby, the simplicity and low cost of the apparatus can be achieved.

  An electrode 2 is an observation side electrode, and a transparent electrode 5 is formed on a transparent substrate 4.

  The other electrode 3 is an electrode opposed to the electrode 2, and an electrode in which the metal electrode 7 is formed on the substrate 6 can be used. The electrode 3 may be an opaque metal plate electrode together with the substrate, or may be a transparent electrode similar to the electrode 2 described above.

  A concentration change material layer 8 is held between the electrodes 2 and 3 by the electrodes 2 and 3 and the sealant 9.

  Here, the pair of solid electrodes used in the present invention means that the display element surface is formed of a pair of electrodes, and when a voltage is applied to a pair of electrodes facing each other, either electrode is a positive electrode or a negative electrode. It refers to an electrode that becomes an electrode and only a dark / light uniform image is formed on the density change material layer 8 sandwiched between both electrodes.

  In the present invention, when the solid electrode is viewed from the outside, only a dark (or light) uniform image is formed in the solid electrode during visualization, and only a light (or dark) uniform image is formed when invisible. A visible image can be displayed through a latent image described later. Therefore, as long as the above dark / light display can be achieved, the method is not particularly limited, and can be selected from known methods.

  Examples of a method for forming a uniform dark / light image by applying a voltage between opposing electrodes include, for example, cholesteric liquid crystal, bistable nematic liquid crystal, chiral nematic liquid crystal ferroelectric liquid crystal using optical anisotropy. Electrophoresis using charged particle movement, particle movement, microcapsule, electrochromic using redox precipitation, electrodeposition, and the like can be used. Considering generation of electric power and voltage in a non-contact manner, a method with low operating electric power is preferable, and electrodeposition using an electrolyte for the concentration change material layer 8 is particularly preferable.

  FIG. 2 is a schematic view of display of a display element used in the card of the present invention.

  FIG. 2A shows a configuration in which an electric field can be applied between the electrodes of the display element shown in FIG.

  In the figure, the electrode 2 is a transparent electrode, the metal electrode 7 of the electrode 3 is an opaque electrode, and a concentration changing material layer (not shown) is formed between the electrodes 2 and 3.

  In FIG. 2B, a latent image is formed on the latent image forming layer (not shown) formed on the surface of the transparent electrode 5 of the electrode 2 using an infrared laser. In this case, the density changing material layer contains a white pigment, and the latent image forming layer is also white so that the latent image is not visually recognized.

  In FIG. 2C, the light transmittance of the electrolyte layer is changed by applying an electric field, and the latent image is displayed as a visible image.

  In the card of the present invention, a plurality of display elements configured as described above are mounted, antennas are connected to the display elements, electric power is supplied in a non-contact manner by electromagnetic induction or electromagnetic coupling, and depending on whether an electric field is applied or not. Visible or invisible is displayed.

  The electric field application method used in the card of the present invention is not particularly limited as long as it can apply charges between the counter electrodes in a non-contact manner, but is preferably a method such as electromagnetic induction or electromagnetic coupling.

  As a method for generating electricity and performing communication without contact, a known method can be used. For example, standardized wavelengths such as 125-134 KHz band, 13.56 MHz band, 860-960 MHz band, 2.45 GHz band, etc. On the other hand, an antenna having a characteristic having a suitable resonance point can be used, but the vicinity of 13.56 MHz used in a non-contact IC card can also be used as a reader / writer of the IC card, which is preferable.

  The present invention has at least a device for transmitting an electromagnetic field, an antenna for supplying power to a plurality of display elements in a non-contact manner, and a power supply control circuit. A reader / writer function for reading and writing such information may also be used.

  In the present invention, it is preferable to form an irreversible latent image forming layer on the outer surface of the transparent substrate 4 of the electrode 2 on the observation side or on the transparent electrode 5 and form a latent image on the latent image forming layer. The latent image referred to in the present invention means an image that becomes visible or invisible when electric field application is turned on or off. That is, the latent image is not visible when it is normally non-displayed (off), and in order to make it visible when it is displayed (on), the reflectance of the latent image forming layer is substantially the same as the background when non-displaying. And the light transmittance at the time of display needs to be different.

  The reflectance substantially equivalent to the background means that the difference between the reflectance of the latent image forming layer and the reflectance of the background is within ± 5%, more preferably within 1%.

  With such a configuration, the latent image can be controlled to be visible or invisible only by applying or not applying an electric field, and an image can be displayed with a simple configuration.

  As a latent image forming method used in the present invention, a method of printing on the substrate surface of the observation side electrode by an ink jet method or the like, or a layer sensitive to energy such as heat, pressure and light is formed, and energy is applied to the layer. Various methods such as a method of changing the layer can be used.

  Although it is sufficient that the light transmittance is different between the portion where the latent image is formed and the portion where the latent image is not formed, a specific example of forming a latent image having the above-described reflectance on the substrate of the electrode As a method, for example, a photosensitive resin layer is formed as a latent image forming layer on the substrate surface, and the photosensitive resin layer is formed using energy rays, for example, ultraviolet rays, visible rays, infrared rays, electron beams, laser beams, and the like. A latent image can be formed by methods such as exposure, curing of the resin layer, destruction by ablation, and removal with a solvent by changing solubility.

  As a method of forming a latent image, the method of forming on the surface of the substrate has been described above. However, a method of forming on the inner surface of the substrate, that is, the surface of the transparent electrode 5 of the electrode 2 may be used.

  In the card of the present invention, it is preferable that the plurality of display elements are formed in a form pre-installed in the card. The individual display elements have different resonance frequencies and form individual latent images on the plurality of display elements. The latent image is preferably made visible or invisible depending on whether or not an electric field is applied.

  That is, as the latent image information used in the present invention, it is preferable to record individual information unique to each card, and it is preferable to record personal information as the individual information.

  Personal information includes personal information such as name, address, face image information, biometric information, such as blood type, DNA, tooth shape, fundus image, or key information. By displaying or not displaying, it is useful for identifying a card and an individual or determining authenticity.

  Visible information is preferably printed on the surface of the card of the present invention.

  Visible information includes the name of the railway company, station name, validity period, owner's name, etc. when the card is used as a commuter pass, for example, and the company or organization name when used as an identification card or employee ID card. , Address, phone number, etc., date of issue, personal name, etc.

  Moreover, it is preferable that an IC is incorporated in such a card.

  It is possible to record more information on the IC, and it is possible to form a card such as a bank card, a credit card, a driver's license, or a card that combines them.

  An example of the card of the present invention is shown in FIG.

  FIG. 3A is a schematic configuration diagram of the card of the present invention. The card 10 of the present invention has a plurality of display elements 12 and 13, and individual antennas 14 and 15 are connected to the individual display elements. The resonance frequencies of the antennas 14 and 15 are as shown in FIG. 16 and 17 have different frequencies.

  By having a plurality of display elements having different resonance frequencies, a plurality of information can be used for different purposes, and by combining a plurality of information, it can be used for one purpose with a higher security level. it can.

  Next, FIG. 4 shows a schematic configuration in which the card of the present invention is used for an IC card.

  In the card 30 shown in FIG. 4A, two display elements 12 and 13 are incorporated, and further, an IC 20 and an antenna 21 are incorporated.

  FIG. 4B shows an example in which the resonance frequency 22 of the antenna connected to the IC matches the resonance frequency 16 of the antenna 14 of the display element 12, but these resonance frequencies are different from each other. It may be.

  If the resonance frequency is the same when held over a reader / writer or the like, the data recorded in the IC is displayed on the terminal, and the latent image formed on the display element 12 is visualized. Further, when it is held over a reader / writer having another resonance frequency, only the latent image formed on the display element 17 is visualized.

  FIG. 5 shows an example in which the card of the present invention is used for a non-contact type IC card.

  FIG. 5A shows a schematic configuration of a card having two display elements 32 and 33 and an IC 34.

  FIG. 5B shows a plan view of the card, and FIG. 5B shows a cross-sectional view thereof. Between the upper and lower substrates 51 and 52, the display elements 32 and 33, the IC 34, the antenna 53 connected thereto, and the like are fixed by the adhesive layer 40.

  Individual information X and Y are recorded in the display elements 32 and 33, respectively.

  FIG.5 (c) is a top view of the said card | curd, (c ') is sectional drawing. Face image information 35 and other individual information 36 are printed on the card surface.

  By holding the card thus formed over the display device, various information can be displayed according to the resonance frequency.

  By adopting such a configuration, for example, in addition to the identification card A that performs authentication using the latent image information X of the IC chip and the display element 32, the face image information 35 on the card surface, the individual information 36, and the display element It can be used as an employee ID card B for identification based on 33 latent image information Y.

  Depending on the security level, the card surface print information, IC chip information, and latent image information of the display elements 32 and 33 can be used separately or in combination.

The structure sectional drawing of the display element used for the card | curd of this invention is shown. It is a display schematic diagram of the display element used for the card | curd of this invention. It is a figure which shows an example of the card | curd of this invention. The schematic structure which used the card | curd of this invention for the IC card is shown. The example which used the card | curd of this invention for the non-contact-type IC card is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display element 2,3 Electrode 4 Transparent substrate 5 Transparent electrode 6,51,52 Board | substrate 7 Metal electrode 8 Electrolyte layer 10,30 Card 12,13,32,33 Display element 14,15,53 Antenna 16,17,22 Resonance Frequency 20,34 IC
21 Antenna 35 Face image information 36 Individual information 40 Adhesive layer

Claims (4)

Equipped with multiple display elements that display an image by applying an electric field between the opposing electrodes and reversibly changing the substance between the electrodes, connecting antennas to the display elements, respectively, and supplying electric power without contact by electromagnetic induction or electromagnetic coupling A card that is supplied and displayed in a visible or invisible manner depending on whether or not an electric field is applied. The at least one display element is composed of a pair of electrodes, forms an irreversible latent image on the display element, and displays the latent image in a visible or invisible manner depending on whether or not an electric field is applied. 1. The card according to 1. The card according to claim 1, wherein a plurality of display elements have different electric field application resonance frequencies. An IC card comprising an IC capable of reading and writing by non-contact communication on the card according to any one of claims 1 to 3, wherein the resonant frequency of an antenna of at least one display element, and reading and writing of the IC An IC card characterized by having the same frequency as the resonance frequency of the antenna that performs the above.

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