Image display element and drawing body

Abstract

[Problem] An image display element comprising: a display layer that displays first to nth (n being an integer of at least 2) images; a shading pattern layer provided facing the display layer and having shaded sections and light-transmissive sections that are alternately disposed; and a transparent layer provided between the display layer and the shading pattern layer. The display layer includes pigments and has first to nth images formed by the pigments. Each of the first to nth images is divided into separate sections in accordance with the arrangement pattern for the light-transmissive section and an image viewed via the shading pattern layer changes in accordance with the angle the shading pattern layer is viewed.

Description

[Technical field]

[0001] The present disclosure relates to an image display element and a drawing body. [Background technology]

[0002] In recent years, image display elements have been used in important documents and cards to make counterfeiting difficult and to easily determine whether they are genuine or counterfeit. As such image display elements, hologram elements and display elements in which a lenticular lens is formed on the display image area have been proposed. In addition, a parallax barrier type variable display element using a striped light blocking pattern has also been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-134718 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, in recent years, there has been a demand for image display elements that make it difficult to counterfeit documents, cards, and the like and that enable easy determination of their authenticity.

[0005] An object of the present disclosure is to provide an image display element and a drawing body that are difficult to counterfeit and whose authenticity can be easily determined. [Means for solving the problem]

[0006] In order to solve the above problems, the first disclosure is: A first layer, a second layer, and a third layer, a display layer for displaying first to nth (n is an integer of 2 or more) images; a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; A transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with The first layer, the second layer and the third layer contain pigments that exhibit different colors from each other. wherein the dyes form first to nth images; Each of the first to n-th images is divided into discrete parts corresponding to an arrangement pattern of the light-transmitting parts; This is an image display element in which an image seen through a light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed.

[0008] No. 2 The disclosure of A display layer; a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; A first transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with The display layer is a first display layer for displaying a first image; a second display layer disposed opposite the first display layer and configured to display a second image; a second transparent layer provided between the first display layer and the second display layer; Equipped with At least one of the first display layer and the second display layer includes a first layer, a second layer, and a third layer; the first layer, the second layer and the third layer contain pigments exhibiting different colors from each other; First display layer and Second Display Layer To Each R First image and A second image is formed, When the first display layer includes a first layer, a second layer, and a third layer, a first image is formed by a dye, When the second display layer includes the first layer, the second layer, and the third layer, a second image is formed by a dye, the first image and the second image are each divided at intervals in accordance with an arrangement pattern of the light-transmitting portions; This is an image display element in which an image seen through a light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed.

[0009] No. 3 The disclosure of A first layer, a second layer, and a third layer A first recording layer; a second recording layer provided opposite to the first recording layer; a transparent layer provided between the first recording layer and the second recording layer; Equipped with the first recording layer has display sections for displaying first to nth images (where n is an integer of 2 or more); The first layer, the second layer and the third layer are different colors from each other. a dye is included, and first to nth images are formed by the dye; the second recording layer is provided opposite the display section and includes a light-shielding pattern section having light-shielding sections and light-transmitting sections arranged alternately; Each of the first to n-th images is divided into discrete parts corresponding to an arrangement pattern of the light-transmitting parts; The image seen through the light-shielding pattern portion changes depending on the angle at which the light-shielding pattern portion is viewed. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an exploded perspective view showing an example of the configuration of an image display element according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of the configuration of the image display element according to the first embodiment of the present disclosure. [Diagram 3] FIG. 3 is a plan view showing an example of the configuration of the display layer. [Figure 4] 4A and 4B are cross-sectional views for explaining an example of a method for manufacturing the image display element according to the first embodiment of the present disclosure. [Diagram 5] FIG. 5 is a cross-sectional view showing an example of the configuration of an image display element according to the second embodiment of the present disclosure. [Figure 6] FIG. 6 is a cross-sectional view for explaining the principle of multi-color display of the display layer. [Figure 7] 7A and 7B are cross-sectional views for explaining an example of a method for manufacturing an image display element according to the second embodiment of the present disclosure. [Figure 8] FIG. 8 is a cross-sectional view showing an example of the configuration of an image display element according to the third embodiment of the present disclosure. [Figure 9] FIG. 9 is a cross-sectional view showing an example of the configuration of an image display element according to the fourth embodiment of the present disclosure. [Figure 10] Fig. 10A is a plan view showing an example of the configuration of a first display layer, and Fig. 10B is a plan view showing an example of the configuration of a second display layer. [Figure 11] 11A and 11B are cross-sectional views for explaining an example of a manufacturing method of an image display element according to the fourth embodiment of the present disclosure. [Figure 12] FIG. 12 is a cross-sectional view showing an example of the configuration of an image display element according to a fifth embodiment of the present disclosure. [Figure 13] FIG. 13 is a cross-sectional view showing an example of the configuration of an image display element according to the sixth embodiment of the present disclosure. [Figure 14] Fig. 14A is a plan view showing an example of the configuration of a light-shielding pattern layer, and Fig. 14B is a plan view showing an example of the configuration of a display layer. [Figure 15] 15A and 15B are plan views showing modified examples of the light-shielding pattern layer. [Figure 16] 16A and 16B are plan views showing modified examples of the light-shielding pattern layer. [Figure 17] Fig. 17A is a plan view showing an example of a configuration of a card according to a seventh embodiment of the present disclosure, and Fig. 17B is a cross-sectional view taken along line XVIIB-XVIIB in Fig. 17A. [Figure 18] FIG. 18 is a cross-sectional view showing an example of a configuration of a card according to an eighth embodiment of the present disclosure. [Figure 19] FIG. 19 is a cross-sectional view showing an example of the configuration of an image display element according to the first modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present disclosure will be described in the following order with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals. 1 First embodiment (example of image display element) 2. Second embodiment (example of image display element) 3. Third embodiment (example of image display element) 4. Fourth embodiment (example of image display element) 5. Fifth embodiment (example of image display element) 6 Sixth embodiment (example of image display element) 7 Seventh embodiment (example of card) 8 Eighth embodiment (example of card) 9. Variations

[0013] <1 First embodiment> [Image display element configuration] FIG. 1 is an exploded perspective view showing an example of the configuration of an image display element 10 according to the first embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing an example of the configuration of an image display element 10 according to the first embodiment of the present disclosure. The image display element 10 includes a display layer 11, a light-shielding pattern layer 12, and a transparent layer 13. The light-shielding pattern layer 12 is provided opposite to the display layer 11. The transparent layer 13 is provided between the display layer 11 and the light-shielding pattern layer 12. The image display element 10 has a film or plate shape, and a first surface on the side on which the light-shielding pattern layer 12 is provided becomes a display surface S1 of a display image, and a second surface on the side on which the display layer 11 is provided becomes a back surface S2. Hereinafter, a direction perpendicular to the display surface S1 is referred to as a "vertical direction", and a diagonal direction of a specified angle ±θ based on this perpendicular direction is referred to as a "diagonal direction of a specified angle ±θ".

[0014] (display layer) FIG. 3 is a plan view showing an example of the configuration of the display layer 11. The display layer 11 displays a first image 111 and a second image 112. The first image 111 and the second image 112 have, for example, the same hue. The first image 111 and the second image 112 are each divided into discrete image elements 111A and image elements 112A corresponding to the arrangement pattern of the light-transmitting portion 12TR of the light-shielding pattern layer 12. The image elements 111A of the first image 111 and the image elements 112A of the second image 112 are repeatedly arranged in the order of the image elements 111A of the first image 111 and the image elements 112A of the second image 112. That is, the image elements 111A of the first image 111 and the image elements 112A of the second image 112 are alternately arranged. The image elements 111A and the image elements 112A have an approximately strip-like shape. The arrangement patterns of the image elements 111A and 112A are similar to the arrangement pattern of the light-transmitting portions 12TR of the light-shielding pattern layer 12 (that is, the stripe-shaped arrangement pattern).

[0015] The display layer 11 has a flat surface. As described later, the display layer 11 is formed by irradiating a recording layer having a substantially constant thickness with laser light, and therefore the display layer 11 has a flat surface.

[0016] The display layer 11 contains a dye, and the first image 111 and the second image 112 are formed by this dye. The display layer 11 is preferably made of a material that allows stable recording and can control the coloring state. Specifically, the display layer 11 preferably contains an electron-donating dye and an electron-accepting substance. A color reaction occurs between the electron-donating dye and the electron-accepting substance due to an external stimulus (irradiation with laser light), and the irradiated part develops color. This forms the first image 111 and the second image 112. The display layer 11 preferably contains a photothermal conversion material or a polymer material, and more preferably contains both of these materials. In addition to the above materials, the display layer 11 may contain various additives such as a sensitizer and an ultraviolet absorbing material. The thickness of the display layer 11 is, for example, 1 μm or more and 10 μm or less.

[0017] The reaction between the electron donor dye and the electron acceptor substance is, for example, reversible. When the electron donor dye becomes colored, the first image 111 and the second image 112 are formed, and when the electron donor dye becomes colorless, the first image 111 and the second image 112 are erased.

[0018] Examples of the electron-donating dye include leuco dyes. Examples of the leuco dye include existing dyes for thermal paper. Specifically, one example is a compound represented by the following formula (1) that contains a group having electron-donating properties in the molecule.

[0019] [ka]

[0020] The electron-accepting substance is a color-developing / decolorizing agent for the electron-donating dye. The electron-accepting substance is, for example, a substance for making a colorless electron-donating dye develop color or for decolorizing an electron-donating dye exhibiting a predetermined color. Examples of the color-developing / decolorizing agent include a compound having a salicylic acid skeleton shown in the following formula (2) and containing an electron-accepting group in the molecule.

[0021] [ka] (X is any one of -NHCO-, -CONH-, -NHCONH-, -CONHCO-, -NHNHCO-, -CONHNH-, -CONHNHCO-, -NHCOCONH-, -NHCONHCO-, -CONHCONH-, -NHNHCONH-, -NHCONHNH-, -CONHNHCONH-, -NHCONHNHCO-, and -CONHNHCONH-. R is a linear hydrocarbon group having 25 to 34 carbon atoms.)

[0022] The photothermal conversion material absorbs light in a predetermined wavelength range in the near-infrared region to generate heat. As the photothermal conversion material, it is preferable to use a near-infrared absorbing dye that has an absorption peak in the wavelength range of 700 nm to 2000 nm and has almost no absorption in the visible region. Specifically, for example, a compound having a phthalocyanine skeleton (phthalocyanine dye), a compound having a squarylium skeleton (squarylium dye), and for example, an inorganic compound can be mentioned. For example, the inorganic compound can be a metal complex such as a dithio complex, a diimonium salt, an aminium salt, an inorganic compound, and the like. For example, the inorganic compound can be graphite, carbon black, metal powder particles, tricobalt tetroxide, iron oxide, chromium oxide, copper oxide, titanium black, ITO (indium tin oxide), and other metal oxides, metal nitrides such as niobium nitride, metal carbides such as tantalum carbide, metal sulfides, and various magnetic powders. In addition, a compound having a cyanine skeleton (cyanine dye) having excellent light resistance and heat resistance can be used. Here, excellent light resistance means that the compound does not decompose when irradiated with a laser beam. Excellent heat resistance means that the maximum absorption peak value of the absorption spectrum does not change by 20% or more when the compound is formed into a film together with a polymer material and stored at 150°C for 30 minutes. Examples of such compounds having a cyanine skeleton include those having at least one of a counter ion of SbF6, PF6, BF4, ClO4, CF3SO3, and (CF3SO3)2N and a methine chain containing a 5-membered ring or a 6-membered ring in the molecule. It is preferable that the compound having a cyanine skeleton used in the image display element 10 according to the first embodiment has both one of the counter ions and a cyclic structure such as a 5-membered ring or a 6-membered ring in the methine chain, but sufficient light resistance and heat resistance are ensured if the compound has at least one of the counter ions and a cyclic structure such as a 5-membered ring or a 6-membered ring in the methine chain.

[0023] The polymeric material preferably has a function as a binder. The polymeric material is preferably one in which the electron donating dye, the color developing / reducing agent, and the photothermal conversion material are easily dispersed uniformly. Examples of the polymeric material include at least one of thermosetting resins and thermoplastic resins. Specifically, examples of the polymeric material include at least one selected from the group consisting of polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethyl cellulose, polystyrene, styrene-based copolymer, phenoxy resin, polyester, aromatic polyester, polyurethane, polycarbonate, polyacrylic acid ester, polymethacrylic acid ester, acrylic acid-based copolymer, maleic acid-based polymer, polyvinyl alcohol, modified polyvinyl alcohol, hydroxyethyl cellulose, carboxymethyl cellulose, and starch.

[0024] (Light-shielding pattern layer) The light-shielding pattern layer 12 partially shields the display layer 11 from light with a light-shielding pattern, and changes the image displayed by the display layer 11 depending on the angle at which the display surface S1 is viewed (i.e., the angle at which the light-shielding pattern layer 12 is viewed). The light-shielding pattern layer 12 has light-shielding portions 12BK and light-transmitting portions 12TR that are alternately arranged. The light-shielding portions 12BK and the light-transmitting portions 12TR have a substantially stripe-like shape. The light-shielding portions 12BK and the light-transmitting portions 12TR are arranged in a regular arrangement pattern. In the first embodiment, a case will be described where the regular arrangement pattern of the light-shielding portions 12BK and the light-transmitting portions 12TR is a stripe-like arrangement pattern.

[0025] The light-shielding pattern layer 12 has a flat surface. As described later, the light-shielding pattern layer 12 is formed by irradiating a recording layer having a substantially constant thickness with a laser beam, and therefore the light-shielding pattern layer 12 has a flat surface.

[0026] The light shielding portion 12BK is for blocking light incident on the display surface S1 and light reflected by the display layer 11, etc. The light shielding portion 12BK is provided facing the image element 112A. In the first embodiment, an example will be described in which the light shielding portion 12BK and the image element 112A overlap substantially entirely in the thickness direction of the image display element 10, but the light shielding portion 12BK and the image element 112A may overlap partially in the thickness direction of the image display element 10. The color of the light shielding portion 12BK is, for example, black, but is not limited to black as long as it is capable of blocking light.

[0027] The light-transmitting portion 12TR is for transmitting light incident on the display surface S1 and light reflected by the display layer 11, etc. The light-transmitting portion 12TR is provided opposite the image element 111A. In the first embodiment, an example in which the light-transmitting portion 12TR and the image element 111A overlap substantially entirely in the thickness direction of the image display element 10 will be described, but the light-transmitting portion 12TR and the image element 111A may overlap partially in the thickness direction of the image display element 10.

[0028] When viewing display surface S1 from a vertical direction, image element 111A (i.e., first image 111) is seen through light-transmitting portion 12TR (see viewpoint 2 in FIG. 2). When viewing display surface S1 from an oblique direction at a specified angle ±θ, image element 112A (i.e., second image 112) is seen through light-transmitting portion 12TR (see viewpoints 1 and 3 in FIG. 2).

[0029] Image element 111A has approximately the same width as light-transmitting portion 12TR. Here, "approximately the same width" means that the ratio (W2:W3) of width W2 of light-transmitting portion 12TR to width W3 of image element 111A is in the range of 1:0.9 to 1:1.1. In this specification, the symbol "to" indicating a numerical range is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit.

[0030] Image element 112A has substantially the same width as light-transmitting portion 12TR. Here, "substantially the same width" means that the ratio (W2:W4) of width W2 of light-transmitting portion 12TR to width W4 of image element 112A is in the range of 1:0.9 to 1:1.1.

[0031] The ratio (W1:W2) of the width W1 of the light-shielding portion 12BK to the width W2 of the light-transmitting portion 12TR is preferably about 1:1, specifically 1:0.9 to 1:1.1 The thickness of the light-shielding pattern layer 12 is, for example, 1 μm or more and 50 μm or less.

[0032] The light-shielding pattern layer 12 contains a dye, and the light-shielding portion 12BK is formed by this dye. The light-shielding pattern layer 12 is preferably composed of a material that allows stable recording and can control the coloring state. Specifically, the light-shielding pattern layer 12 preferably contains an electron-donating dye and an electron-accepting substance. A color reaction occurs between the electron-donating dye and the electron-accepting substance due to an external stimulus (irradiation with laser light), and the irradiated portion develops color. This forms the light-shielding portion 12BK. The light-shielding pattern layer 12 preferably contains a photothermal conversion material or a polymer material, and more preferably contains both of these materials. The photothermal conversion material contained in the display layer 11 and the photothermal conversion material contained in the light-shielding pattern layer 12 preferably have different absorption wavelengths. This makes it possible to selectively develop or reduce color in a desired layer of the display layer 11 and the light-shielding pattern layer 12 by laser light. In addition to the above materials, the light-shielding pattern layer 12 may contain various additives such as a sensitizer and an ultraviolet absorbing material. The thickness of the light-shielding pattern layer 12 is, for example, not less than 1 μm and not more than 50 μm.

[0033] The reaction between the electron donor dye and the electron acceptor material is, for example, reversible. When the electron donor dye becomes colored, the light shielding portion 12BK is formed, and when the electron donor dye becomes colorless, the light shielding portion 12BK is erased. The light shielding portion 12BK contains the electron donor dye in a colored state. On the other hand, the light transmitting portion 12TR contains the electron donor dye in a colorless state.

[0034] The electron donating dye, the electron accepting substance, the light-to-heat conversion material, and the polymer material may each be exemplified by the same materials as those used for the display layer 11 .

[0035] (transparent layer) The transparent layer 13 separates the display layer 11 and the light-shielding pattern layer 12, and supports the display layer 11 and the light-shielding pattern layer 12. The transparent layer 13 is, for example, a transparent film. The thickness of the transparent layer 13 is, for example, 50 μm or more and 600 μm or less. The transparent layer 13 is configured to be capable of transmitting light that has passed through the light-transmitting portion 12TR and light that has been reflected by the display layer 11, etc. The transparent layer 13 is transparent, for example, in the near-infrared range and the visible range.

[0036] The transparent layer 13 includes, for example, glass or a polymer resin. Examples of the polymer resin include At least one selected from the group consisting of triacetyl cellulose (TAC), polyester (TPEE), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyamide (PA), aramid, polyethylene (PE), polyacrylate, polyethersulfone, polysulfone, polypropylene (PP), diacetyl cellulose, polyvinyl chloride, acrylic resin (PMMA), polycarbonate (PC), epoxy resin, urea resin, urethane resin, melamine resin, and cycloolefin polymer (COP) can be used.

[0037] [Manufacturing method of image display element] Hereinafter, an example of a method for manufacturing the image display element 10 according to the first embodiment of the present disclosure will be described with reference to FIGS. 4A and 4B.

[0038] (Laminate Forming Process) The laminate 10A shown in FIG. 4A is formed as follows. First, a polymeric material is dissolved in a solvent (e.g., methyl ethyl ketone). Next, an electron donating dye, an electron accepting substance, and a photothermal conversion material are added to this solution and dispersed. This results in a coating material for forming a recording layer. Next, this coating material for forming a recording layer is applied to the first surface of the transparent layer 13 to a thickness of, for example, 3 μm, and dried at, for example, 70° C. This forms a first recording layer 11A.

[0039] Next, in the same manner as in the formation process of the first recording layer, a second recording layer 12A is formed on the second surface of the transparent layer 13. This forms a laminate 10A. However, as the photothermal conversion material, a material different from that used in the formation process of the first recording layer 11A is used. As the electron donor dye and the electron acceptor, a material different from that used in the formation process of the first recording layer 11A may be used, or the same material may be used.

[0040] The laminate 10A may be formed by a method other than the above coating. For example, the first recording layer 11A and the second recording layer 12A may be formed in advance on separate substrates, and then these may be bonded to the first surface and the second surface of the transparent layer 13 via an adhesive layer, respectively.

[0041] (Image and light-shielding part drawing process) For example, as shown in FIG. 4B, near-infrared laser light L1 and near-infrared laser light L2, whose wavelength and output are adjusted, are irradiated to desired positions of the first recording layer 11A and the second recording layer 12A, respectively, by a semiconductor laser or the like. As a result, the photothermal conversion materials contained in the first recording layer 11A and the second recording layer 12A generate heat, and a color reaction (coloring reaction) occurs between the electron donor dye and the electron acceptor substance, causing the irradiated portions to develop color. As a result, the first image 111 and the second image 112 are formed on the first recording layer 11A, and the display layer 11 is obtained. Also, the light-shielding portion 12BK and the light-transmitting portion 12TR are formed on the second recording layer 12A, and the light-shielding pattern layer 12 is obtained.

[0042] As shown in FIG. 4B, it is preferable to irradiate the first recording layer 11A and the second recording layer 12A with the laser light L1 and the laser light L2 while aligning their optical axes. By controlling the irradiation of the laser light L1 and the laser light L2 in this way, it becomes unnecessary to align the optical axes of the laser light L1 and the laser light L2 when drawing the first recording layer 11A and the second recording layer 12A. In addition, it is also possible to suppress misalignment of the light-shielding portion 12BK, the light-transmitting portion 12TR, the image element 111A, and the image element 112A. Since the transparent layer 13 is thin, the focal positions of the laser light L1 and the laser light L2 may be approximately the same.

[0043] However, the method of irradiating the laser light L1 and the laser light L2 is not limited to the above example. For example, the optical axes of the laser light L1 and the laser light L2 may be shifted so that the laser light L1 and the laser light L2 are irradiated onto the first recording layer 11A and the second recording layer 12A, respectively. Alternatively, the laser light L1 and the laser light L2 may be obliquely incident on the first recording layer 11A and the second recording layer 12A.

[0044] It is also possible to rewrite the image on the display layer 11 and the light-shielding pattern on the light-shielding pattern layer 12. When decolorizing the image on the display layer 11 and the light-shielding pattern on the light-shielding pattern layer 12, the display layer 11 and the light-shielding pattern layer 12 are irradiated with near-infrared laser light with energy sufficient to reach the decolorization temperature. As a result, the photothermal conversion material contained in the display layer 11 and the light-shielding pattern layer 12 generates heat, and a decolorization reaction occurs between the electron-donating dye and the electron-accepting substance, causing the image on the display layer 11 and the light-shielding pattern on the light-shielding pattern layer 12 to lose their color, and the records are erased. In addition, when erasing all the records formed on the display layer 11 and the light-shielding pattern layer 12 at once, the image display element 10 is heated to a temperature sufficient to decolorize, for example, 120°C. As a result, the image recorded on the display layer 11 and the light-shielding pattern recorded on the light-shielding pattern layer 12 are erased at once. Thereafter, by performing the above-mentioned operation, repeated recording on the display layer 11 and the light-shielding pattern layer 12 is possible.

[0045] The colored and decolored states are maintained unless the coloring and decoloring reactions caused by the above-mentioned irradiation with near-infrared rays or heating are carried out.

[0046] [Effects] As described above, in the image display element 10 according to the first embodiment, the first image 111 and the second image 112 are divided into discrete image elements 111A and image elements 112A, respectively, in accordance with the arrangement pattern of the light-transmitting portions 12TR. This allows the image seen through the light-shielding pattern layer 12 to change depending on the angle at which the display surface S1 (i.e., the light-shielding pattern layer 12) is seen. Specifically, when the display surface S1 is seen from the vertical direction, the image elements 111A (i.e., the first image 111) are seen from the light-transmitting portions 12TR (see viewpoint 2 in FIG. 2). When the display surface S1 is seen from an oblique direction at a specified angle ±θ, the image elements 112A (i.e., the second image 112) are seen from the light-transmitting portions 12TR (see viewpoints 1 and 3 in FIG. 2). This makes it difficult to counterfeit the image display element 10, and makes it easy to determine whether the image display element 10 is genuine or not.

[0047] The display layer 11 and the light-shielding pattern layer 12 can be formed by irradiating the first recording layer 11A and the second recording layer 12A with the laser light L1 and the laser light L2, respectively. Therefore, since there is no need to prepare a plate as in the case of a hologram, the cost can be kept low even when only a small number of image display elements 10 are produced. In addition, since a lenticular lens is not used, the image display element 10 can be produced at low cost. In addition, the concave-convex period of the lenticular lens is, for example, about 100 lines / inch, but in the method for producing the image display element 10 according to the first embodiment, a stripe pattern can be drawn at, for example, 350 lines / inch. Therefore, the resolution of the displayed image can be increased, for example, by more than twice.

[0048] In display elements with a lenticular lens formed on the display image portion and parallax barrier type variable display elements, the display surface has minute irregularities due to the lenticular lens or printing ink. Therefore, when other layers such as a protective film are bonded to the surface of such devices, small air bubbles are likely to be trapped at the interface, and the air bubbles may remain at the interface after bonding. When documents or cards equipped with image display elements with air bubbles remaining at the interface are placed under reduced pressure such as in an airplane, the volume of the air bubbles may expand, making the air bubbles more noticeable, or the protective film may peel off. In contrast, in the image display element 10 according to the first embodiment, the light-shielding pattern layer 12 is formed by irradiating the second recording layer 12A, which has a flat surface, with the laser light L2, so that the light-shielding pattern layer 12 having a flat surface can be formed. Therefore, when another layer such as a protective film is bonded to the display surface S1 of the image display element 10, air bubbles are unlikely to enter the interface between the image display element 10 and the other layer, so that it is possible to suppress air bubbles from remaining at the interface after bonding.

[0049] In a display element with a lenticular lens formed on the display image area, precise alignment of the lenticular lens's concave and convex period with the printed image area is required. Parallax barrier type variable display elements also require precise alignment of multiple printed materials to be superimposed. In contrast, in the image display element 10 of the first embodiment, the display layer 11 and the light-shielding pattern layer 12 can be formed by irradiating the first recording layer 11A and the second recording layer 12A with laser light L1 and laser light L2, respectively, so that precise alignment as in the above-mentioned display element is not required when forming the display layer 11 and the light-shielding pattern layer 12.

[0050] <2. Second embodiment> 5 is a cross-sectional view showing an example of a configuration of an image display element 20 according to a second embodiment of the present disclosure. The image display element 20 differs from the image display element 10 according to the first embodiment in that the image display element 20 includes a display layer 21 that displays a first image 111 and a second image 112 in multiple colors (e.g., full color) instead of the display layer 11 (see FIGS. 1 and 2) that displays a first image 111 and a second image 112 in a single color.

[0051] The display layer 21 includes a first layer 22, a second layer 23, a third layer 24, a heat insulating layer 25, and a heat insulating layer 26. The second layer 23 is provided on the first layer 22, and the third layer 24 is provided on the second layer 23. The heat insulating layer 25 is provided between the first layer 22 and the second layer 23, and the heat insulating layer 26 is provided between the second layer 23 and the third layer 24.

[0052] The first layer 22, the second layer 23, and the third layer 24 contain pigments that exhibit different colors from one another, and the pigments contained in these layers form a first image 111 and a second image 112. The first layer 22 contains, for example, a pigment that develops a yellow color. The second layer 23 contains, for example, a pigment that develops a cyan color. The third layer 23 contains, for example, a pigment that develops a magenta color.

[0053] The first layer 22 has, for example, a coloring portion 22A containing a pigment in a colored state and a non-coloring portion 22B containing a pigment in a decolored state. The second layer 23 has, for example, a coloring portion 23A containing a pigment in a colored state and a non-coloring portion 23B containing a pigment in a decolored state. The third layer 24 has, for example, a coloring portion 24A containing a pigment in a colored state and a non-coloring portion 24B containing a pigment in a decolored state. The non-coloring portion 22B, the non-coloring portion 23B, and the non-coloring portion 24B are transparent.

[0054] The first layer 22, the second layer 23, and the third layer 24 are preferably each made of a material capable of stable recording and controlling the color development state. Specifically, the first layer 22, the second layer 23, and the third layer 24 contain, for example, electron donor dyes exhibiting different hues from each other and electron acceptor substances corresponding to the electron donor dyes. The first layer 22, the second layer 23, and the third layer 24 preferably contain a photothermal conversion material or a polymer resin that absorbs light in different wavelength ranges from each other to generate heat, and more preferably contain both of these materials.

[0055] As described above, the electron-accepting substance is for example used to make a colorless electron-donating dye develop a color or to reduce the color of an electron-donating dye exhibiting a predetermined color. The electron-accepting substance is selected from compounds having a salicylic acid skeleton shown in the above formula (2) and containing an electron-accepting group in the molecule. As described above, the photothermal conversion material is selected from compounds having a phthalocyanine skeleton (phthalocyanine dyes), compounds having a squarylium skeleton (squarylium dyes), inorganic compounds, and the like. In addition, as in the first embodiment, a compound having a cyanine skeleton (cyanine dyes) having excellent light resistance and heat resistance may be used.

[0056] Specifically, the first layer 22 includes, for example, an electron donor dye that exhibits a yellow color in the colored state, a corresponding electron acceptor substance, a photothermal conversion material that absorbs infrared rays with a wavelength of λ1 to generate heat, and a polymer resin. The second layer 23 includes, for example, an electron donor dye that exhibits a cyan color in the colored state, a corresponding electron acceptor substance, a photothermal conversion material that absorbs infrared rays with a wavelength of λ2 to generate heat, and a polymer resin. The third layer 24 includes, for example, an electron donor dye that exhibits a magenta color in the colored state, a corresponding electron acceptor substance, a photothermal conversion material that absorbs infrared rays with a wavelength of λ3 to generate heat, and a polymer resin. This provides the display layer 21 that can display multiple colors.

[0057] It is preferable to select a combination of photothermal conversion materials that have a narrow light absorption band in the wavelength range of 700 nm to 2000 nm and do not overlap with each other, for example. This makes it possible to selectively develop or reduce color in a desired layer among the first layer 22, the second layer 23, and the third layer 24.

[0058] The thickness of each of the first layer 22, the second layer 23, and the third layer 24 is preferably, for example, 1 μm or more and 20 μm or less, and more preferably, for example, 2 μm or more and 15 μm or less. If the thickness of each of the layers 22, 23, and 24 is less than 1 μm, there is a risk that sufficient color development density cannot be obtained. Also, if the thickness of each of the layers 22, 23, and 24 exceeds 20 μm, the amount of heat used by each of the layers 22, 23, and 24 increases, and there is a risk that the color development property will deteriorate.

[0059] Similarly to the display layer 11, the first layer 22, the second layer 23 and the third layer 24 may contain various additives, such as a sensitizer and an ultraviolet absorbing material, in addition to the above materials.

[0060] The heat insulating layer 25 provides thermal insulation between the first layer 22 and the second layer 23. The heat insulating layer 26 provides thermal insulation between the second layer 23 and the third layer 24. The heat insulating layer 25 and the heat insulating layer 26 are transparent. Specifically, for example, the heat insulating layer 25 and the heat insulating layer 26 are transparent in the near infrared region and the visible region.

[0061] The heat insulating layer 25 and the heat insulating layer 26 include, for example, a general polymeric material having light transmissivity. Specific examples of the material of the heat insulating layer 25 and the heat insulating layer 26 include at least one selected from the group consisting of polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethyl cellulose, polystyrene, styrene-based copolymer, phenoxy resin, polyester, aromatic polyester, polyurethane, polycarbonate, polyacrylic acid ester, polymethacrylic acid ester, acrylic acid-based copolymer, maleic acid-based polymer, polyvinyl alcohol, modified polyvinyl alcohol, hydroxyethyl cellulose, carboxymethyl cellulose, and starch. The heat insulating layer 25 and the heat insulating layer 26 may include various additives such as ultraviolet absorbing agents.

[0062] The heat insulating layer 25 and the heat insulating layer 26 may contain an inorganic material having translucency. For example, if the heat insulating layer 25 and the heat insulating layer 26 contain porous silica, alumina, titania, carbon, or a composite of these, the thermal conductivity is low and the heat insulating effect is high, which is preferable. The heat insulating layer 25 and the heat insulating layer 26 can be formed by, for example, a sol-gel method.

[0063] The thickness of the heat insulating layer 25 and the heat insulating layer 26 is preferably, for example, 3 to 100 μm, and more preferably, for example, 5 to 50 μm. If the thickness of the heat insulating layer 25 and the heat insulating layer 26 is too thin, a sufficient heat insulating effect cannot be obtained, and if the thickness is too thick, the thermal conductivity deteriorates when the entire display layer 21 is uniformly heated, and the light transmittance decreases.

[0064] 6 is a cross-sectional view for explaining the principle of multi-color display of the display layer 21. Here, the principle of multi-color display will be explained by taking as an example a case where the first layer 22, the second layer 23, and the third layer 24 contain a dye that produces a yellow color, a dye that produces a cyan color, and a dye that produces a magenta color, respectively.

[0065] A green colored colored portion 111B is formed in the first image 111 by a portion where the yellow colored colored portion 22A, the cyan colored colored portion 23A, and the non-colored portion 24B overlap in the thickness direction of the display layer 21. A red colored colored portion 112B is formed in the first image 111 by a portion where the yellow colored colored portion 22A, the non-colored portion 23B, and the magenta colored colored portion 23A overlap in the thickness direction of the display layer 21.

[0066] The image display element 20 may include a light-shielding pattern layer having a configuration similar to that of the display layer 21, instead of the light-shielding pattern layer 12. In this case, the light-shielding portion 12BK is formed by the pigments contained in the first layer 22, the second layer 23, and the third layer 24.

[0067] [Manufacturing method of image display element] Hereinafter, an example of a method for manufacturing the image display element 20 according to the second embodiment of the present disclosure will be described with reference to FIGS. 7A and 7B.

[0068] (Laminate Forming Process) 7A, a laminate 20A is obtained by forming a first recording layer 21A and a second recording layer 12A on the first and second main surfaces, respectively, of a transparent layer 13. In this case, the first recording layer 21A is formed by laminating a third layer 24, a heat insulating layer 26, a second layer 23, a heat insulating layer 25, and a first layer 22 in this order on the first main surface of the transparent layer 13.

[0069] (Image and light-shielding part drawing process) Next, as shown in FIG. 7B, near-infrared laser beams L1 to L4 with adjusted wavelengths and outputs are irradiated to desired positions of the first layer 22, the second layer 23, the third layer 24, and the second recording layer 12A, respectively, using, for example, a semiconductor laser. As a result, the photothermal conversion materials contained in the first layer 22, the second layer 23, the third layer 24, and the second recording layer 12A generate heat, and a color reaction (coloring reaction) occurs between the electron donor dye and the electron acceptor substance, causing the irradiated portions to develop color. As a result, the coloring portion 22A and the non-coloring portion 22B are formed in the first layer 22, the coloring portion 23A and the non-coloring portion 23B are formed in the second layer 23, and the coloring portion 24A and the non-coloring portion 24B are formed in the third layer 24. Thus, the display layer 21 that displays the first image 111 and the second image 112 is obtained. Furthermore, a light-shielding portion 12BK and a light-transmitting portion 12TR are formed in the second recording layer 12A, and a light-shielding pattern layer 12 is obtained.

[0070] As shown in FIG. 7B, it is preferable to irradiate the first layer 22, the second layer 23, the third layer 24, and the second recording layer 12A with the laser beams L1 to L4 while aligning their optical axes. By controlling the irradiation of the laser beams L1 to L4 in this way, it is not necessary to align the optical axes of the laser beams L1 to L4 when drawing the first layer 22, the second layer 23, the third layer 24, and the second recording layer 12A. In addition, it is also possible to suppress misalignment of the light-shielding portion 12BK, the light-transmitting portion 12TR, the image element 111A, and the image element 112A. Since the heat insulating layer 25 and the heat insulating layer 26 are thin, the focal positions of the laser beams L1 to L3 may be approximately the same. Furthermore, since the transparent layer 13 is thin, the focal positions of the laser beams L3 and L4 may be approximately the same.

[0071] [Actions and Effects] As described above, the image display element 20 according to the second embodiment includes the first layer 22, the second layer 23, and the third layer 24. The first layer 22, the second layer 23, and the third layer 24 contain pigments that exhibit different colors, and the first image 111 and the second image 112 are formed by the pigments contained in these layers. This makes it possible to display the first image 111 in multiple colors (for example, full color) and the second image 112 in multiple colors (for example, full color). It is also possible to display the first image 111 and the second image 112 having different hues. For example, it is possible to display the first image 111 having red and the second image 112 having green.

[0072] <3. Third embodiment> 8 is a cross-sectional view showing an example of a configuration of an image display element 30 according to a third embodiment of the present disclosure. The image display element 30 differs from the image display element 20 according to the second embodiment in that the image display element 30 includes a single-layer display layer 31 that displays a first image 111 and a second image 112 in multiple colors (for example, full color) instead of the three-layer display layer 21 (see FIG. 5) that displays a first image 111 and a second image 112 in multiple colors (for example, full color).

[0073] The display layer 31 includes three types of microcapsules 31C, 31M, and 31Y that exhibit different colors in a color-developed state, and a polymer resin. The first image 111 and the second image 112 are formed by these three types of microcapsules 31C, 31M, and 31Y. Each of the microcapsules 31C, 31M, and 31Y includes, for example, an electron-donating dye that exhibits a different color (for example, cyan (C), magenta (M), and yellow (Y)), an electron-accepting substance corresponding to each electron-donating dye, a photothermal conversion material that absorbs light in different wavelength ranges and generates heat, and a capsule wall. The electron-donating dye, the electron-accepting substance, and the photothermal conversion material are contained in the capsule wall. As the material of the capsule wall, for example, it is preferable to use the material that constitutes the heat insulating layer 25 and the heat insulating layer 26.

[0074] 8, the image display element 30 may include a light-shielding pattern layer 32 having a similar configuration to the display layer 31, instead of the light-shielding pattern layer 12 in the first embodiment. That is, the image display element 30 may include a light-shielding pattern layer 32 containing three types of microcapsules 31C, 31M, and 31Y and a polymer resin. In this case, the light-shielding portion 12BK is formed by these three types of microcapsules 31C, 31M, and 31Y.

[0075] [Effects] As described above, in the image display element 30 according to the third embodiment, the display layer 31 includes three types of microcapsules 31C, 31M, and 31Y that exhibit different colors in a colored state, and a polymer resin. The first image 111 and the second image 112 are formed by these three types of microcapsules 31C, 31M, and 31Y (specifically, the pigments contained in these three types of microcapsules 31C, 31M, and 31Y, respectively). This allows the first image 111 of multiple colors (for example, full color) and the second image 112 of multiple colors (for example, full color) to be displayed by the display layer 31 with a single layer structure. In addition, the first image 111 and the second image 112 having different hues from each other can also be displayed by the display layer 31 with a single layer structure. For example, the first image 111 having red and the second image 112 having green can be displayed by the display layer 31 with a single layer structure.

[0076] <4. Fourth embodiment> [Image display element configuration] 9 is a cross-sectional view showing an example of a configuration of an image display element 40 according to a fourth embodiment of the present disclosure. The image display element 40 differs from the image display element 10 according to the first embodiment in that the image display element 40 includes a display layer 44 instead of the display layer 11 (see FIGS. 1 and 2). The display layer 44 includes a first display layer 41, a second display layer 42, and a transparent layer 43. The second display layer 42 is provided facing the first display layer 41. The transparent layer 43 is provided between the first display layer 41 and the second display layer 42. In the image display element 40 according to the fourth embodiment, the transparent layer 13 is an example of a first transparent layer, and the transparent layer 43 is an example of a second transparent layer.

[0077] (First display layer, second display layer) 10A is a plan view showing an example of the configuration of the first display layer 41. The first display layer 41 displays a first image 411. The first image 411 is divided into discrete image elements 411A in accordance with the arrangement pattern of the light-transmitting portions 12TR. Separation portions 412A are provided between the discretely divided image elements 411A. In other words, the image elements 411A and the separation portions 412A are alternately arranged in the in-plane direction of the first display layer 41.

[0078] The first display layer 41 contains a pigment, and the pigment forms a first image 411. The separated portion 412A may be transparent or may be colored. Except for the above, the first display layer 41 is similar to the display layer 11 in the first embodiment, the display layer 21 in the second embodiment, or the display layer 31 in the third embodiment.

[0079] 10B is a plan view showing an example of the configuration of the second display layer 42. The second display layer 42 displays a second image 421. The second image 421 is divided into discrete image elements 421A in accordance with the arrangement pattern of the light-transmitting portions 12TR. Separation portions 422A are provided between the discretely divided image elements 421A. In other words, the image elements 421A and the separation portions 422A are alternately arranged in the in-plane direction of the second display layer 42.

[0080] The second display layer 42 contains a pigment, and the pigment forms a second image 421. The pigment contained in the separated portion 422A is in a decolorized state, and the separated portion 422A has transparency. In other respects, the second display layer 42 is similar to the display layer 11 in the first embodiment, the display layer 21 in the second embodiment, or the display layer 31 in the third embodiment.

[0081] The image element 411A, the separation portion 422A, and the light-transmitting portion TR overlap in the thickness direction of the image display element 40. The separation portion 412A, the image element 421A, and the light-shielding portion BK overlap in the thickness direction of the image display element 40. The image element 411A has a width substantially similar to that of the light-transmitting portion 12TR. Here, "substantially the same width" means that the ratio (W2:W5) of the width W2 of the light-transmitting portion 12TR to the width W5 of the image element 411A is in the range of 1:0.9 to 1:1.1. The separation portion 412A has a width substantially similar to that of the light-transmitting portion 12TR. Here, "substantially the same width" means that the ratio (W2:W6) of the width W2 of the light-transmitting portion 12TR to the width W6 of the separation portion 412A is in the range of 1:0.9 to 1:1.1. The image element 421A has a width substantially similar to that of the light-transmitting portion 12TR. Here, "substantially the same width" means that the ratio (W2:W7) of width W2 of light-transmitting portion 12TR to width W7 of image element 421A is in the range of 1:0.9 to 1:1.1. Separated portion 422A has substantially the same width as light-transmitting portion 12TR. Here, "substantially the same width" means that the ratio (W2:W8) of width W2 of light-transmitting portion 12TR to width W8 of separated portion 422A is in the range of 1:0.9 to 1:1.1.

[0082] (transparent layer) The transparent layer 43 is for separating the first display layer 41 and the second display layer 42. The transparent layer 43 is, for example, a transparent film. The thickness of the transparent layer 43 is, for example, 50 μm or more and 600 μm or less. The transparent layer 43 is configured to be capable of transmitting light that has passed through the separating portion 422A and light that has been reflected by the first display layer 41, etc. Examples of materials for the transparent layer 43 include the same materials as those for the transparent layer 13.

[0083] [Manufacturing method of image display element] Hereinafter, an example of a method for manufacturing the image display element 40 according to the fourth embodiment of the present disclosure will be described with reference to FIGS. 11A and 11B.

[0084] (Laminate Forming Process) The laminate 10A shown in Fig. 11A is formed as follows. First, a first recording layer 41A and a second recording layer 42A are formed on the first and second main surfaces of a transparent layer 43, respectively. Then, a transparent layer 13 and a third recording layer 43A are formed on the second recording layer 42A. This forms a laminate 40A.

[0085] (Image and light-shielding part drawing process) For example, as shown in FIG. 11B, near-infrared laser beams L1, L2, and L3 with adjusted wavelength and output are irradiated to desired positions of the first, second, and third recording layers 41A, 42A, and 43A, respectively, using a semiconductor laser or the like. As a result, the photothermal conversion materials contained in the first, second, and third recording layers 41A, 42A, and 43A, respectively, generate heat, and a color reaction (coloring reaction) occurs between the electron donor dye and the electron acceptor substance, causing the irradiated portions to develop color. As a result, a first image 411 is formed on the first recording layer 41A, and a first display layer 41 is obtained. Also, a second image 422 is formed on the second recording layer 42A, and a second display layer 42 is obtained. Also, a light-shielding portion 12BK and a light-transmitting portion 12TR are formed on the third recording layer 43A, and a light-shielding pattern layer 12 is obtained.

[0086] As shown in Fig. 11B, it is preferable to irradiate the near-infrared laser beams L1, L2, and L3 to the first, second, and third recording layers 41A, 42A, and 43A, respectively, while aligning the optical axes of the near-infrared laser beams L1, L2, and L3. Since the transparent layer 43 is thin, the focal positions of the laser beams L1 and L2 may be approximately the same. Also, since the transparent layer 13 is thin, the focal positions of the laser beams L2 and L3 may be approximately the same.

[0087] [Effects] As described above, in the image display element 40 according to the fourth embodiment, the display layer 44 includes the first display layer 41 that displays the first image 411, the second display layer 42 that is provided opposite the first display layer 41 and displays the second image 422, and the transparent layer 43 that is provided between the first display layer 41 and the second display layer 42. The first image 411 and the second image 422 are each divided at intervals in accordance with the arrangement pattern of the light-transmitting portion 12TR. As a result, the image seen through the light-shielding pattern layer 12 changes depending on the angle at which the display surface S1 (i.e., the light-shielding pattern layer 12) is viewed. Specifically, when the display surface S1 is viewed from the vertical direction, the image element 411A (i.e., the first image 411) is seen through the separation portion 422A from the light-transmitting portion 12TR (see viewpoint 2 in FIG. 9). When viewing display surface S1 from an oblique direction at a specified angle ±θ, image element 421A (that is, second image 421) is visible from light-transmitting portion 12TR (see viewpoints 1 and 3 in FIG. 9).

[0088] <5. Fifth embodiment> [Image display element configuration] 12 is a cross-sectional view showing an example of a configuration of an image display element 50 according to a fifth embodiment of the present disclosure. The image display element 50 differs from the image display element 10 according to the first embodiment in that the image display element 50 further includes a back surface layer 51 provided on the display layer 11.

[0089] The back surface layer 51 is, for example, a background layer, a reflective layer, or a laminate of these layers. The background layer is for adding a background to the first image 111 and the second image 112 and displaying them. Examples of the background layer include a pattern, a picture, a character, or a combination of two or more of them. The reflective layer is for reflecting light transmitted through the display layer 11. Examples of the reflective layer include a metal reflective layer or a white reflective layer.

[0090] [Effects] In the image display element 50 according to the fifth embodiment of the present disclosure, when the back surface layer 51 is a background layer, the first image 111 and the second image 112 can be displayed with a background added thereto. On the other hand, when the back surface layer 51 is a reflective layer, the first image 111 and the second image 112 can be brightened. Therefore, a clearer image display is possible.

[0091] <6 Sixth embodiment> [Image display element configuration] 13 is a cross-sectional view showing an example of a configuration of an image display element 60 according to a sixth embodiment of the present disclosure. The image display element 60 differs from the image display element 10 according to the first embodiment in that the image display element 60 includes a display layer 61 and a light-shielding pattern layer 62 instead of the display layer 11 and the light-shielding pattern layer 12 (see FIGS. 1 and 2).

[0092] (Light-shielding pattern layer) 14A is a plan view showing an example of the configuration of the light-shielding pattern layer 62. The light-shielding pattern layer 62 has rectangular light-shielding portions 62BK and light-transmitting portions 62TR, which are arranged in a checkered arrangement pattern. In detail, the light-shielding pattern layer 62 has a plurality of rows in which the light-shielding portions 62BK and light-transmitting portions 62TR are arranged alternately. The light-shielding portions 62BK and light-transmitting portions 62TR of adjacent rows are arranged side by side. However, the light-shielding portions 62BK and light-transmitting portions 62TR of adjacent rows may be arranged in a shifted manner.

[0093] In addition, Figure 14A shows an example in which the number of rows in which the light-shielding portions 62BK and the light-transmitting portions 62TR are arranged alternately is three, but the number of rows is not limited to this, and as shown in Figure 15A, the number of rows may be four or more, or may be two.

[0094] Also, while FIG. 14A shows an example in which adjacent columns have the same width, adjacent columns may have different widths as shown in FIG. 15B.

[0095] Furthermore, the shapes of the light-shielding portion 62BK and the light-transmitting portion 62TR are not limited to a rectangular shape, and may be wavy or the like as shown in FIGS. 16A and 16B.

[0096] (display layer) 14B is a plan view showing an example of the configuration of the display layer 61. The display layer 61 has a first image and a second image. The first image and the second image are divided into discrete image elements 611A and image elements 612A, respectively, in accordance with the arrangement pattern of the light-transmitting portions 62TR. The image elements 611A and the image elements 612A have a rectangular shape having approximately the same size as the light-transmitting portions 62TR.

[0097] The arrangement patterns of the image elements 611A and the image elements 612B are similar to the arrangement pattern of the light-transmitting portions 62TR of the light-shielding pattern layer 62 (i.e., the arrangement pattern of a checkerboard). That is, the display layer 61 has a plurality of columns in which the image elements 611A and the image elements 612A are arranged alternately. The image elements 611A and the image elements 612A of the adjacent columns are arranged side by side. However, the image elements 611A and the image elements 612A of the adjacent columns may be arranged in a shifted manner.

[0098] [Effects] As described above, in the image display element 60 according to the sixth embodiment, the light-shielding portions 62BK and the light-transmitting portions 62TR of the light-shielding pattern layer 62 are arranged in a checkered arrangement pattern. Also, the first image and the second image of the display layer 61 are divided into discrete image elements 611A and image elements 612A, respectively, in accordance with the arrangement pattern of the light-transmitting portions 62TR. Therefore, the image display element 60 can be made more difficult to counterfeit than the image display element 10 according to the first embodiment.

[0099] <7 Seventh embodiment> Fig. 17A is a plan view showing an example of the configuration of a card 70 according to a seventh embodiment of the present disclosure. Fig. 17B is a cross-sectional view taken along line XVIIB-XVIIB in Fig. 17A. The card 70 includes a support base 71, a first recording layer 72 provided on the support base 71, a transparent layer 73 provided on the first recording layer 72, a second recording layer 74 provided on the transparent layer 73, and a protective layer 75 provided on the second recording layer 74.

[0100] Card 70 is an example of a representation object, and specifically, for example, an identification card such as an employee ID card or a student ID card. In Fig. 17A and Fig. 17B, an example is shown in which card 70 is an employee ID card. However, card 70 is not limited to an identification card such as an employee ID card or a student ID card, and may be a credit card, a qualification certificate (for example, a driver's license), an insurance card, a patient registration card, a membership card, or the like. Furthermore, the representation object is not limited to a card, and may be a document such as a passport.

[0101] (Support base) The supporting substrate 71 is for supporting each of the first recording layer 72, the transparent layer 73, the second recording layer 74, and the protective layer 75. The supporting substrate 71 includes, for example, a polymer resin. The supporting substrate may or may not be transparent.

[0102] (First recording layer) The first recording layer 72 includes, for example, the same material as the display layer 11 in the first embodiment. The first recording layer 72 includes a display portion 72A, a photograph 72B, and a background portion 72C. The display portion 72A, the photograph 72B, and the background portion 72C are arranged in the in-plane direction of the support substrate 71. The display portion 72A has a configuration similar to that of the display layer 11 in the first embodiment. That is, the display portion 72A displays a first image 111 and a second image 112 (see FIG. 3). The photograph 72B is formed by a dye contained in the first recording layer 72. Specifically, the photograph 72B is formed by a color reaction between an electron donor dye and an electron acceptor substance contained in the first recording layer 72. The background portion 72C is a portion that becomes the background of the card 70. Examples of the background include a design, a picture, or a combination thereof. The background portion 72C is formed by a dye contained in the first recording layer 72. Specifically, the background portion 72C is formed by a color reaction between an electron donating dye and an electron accepting substance contained in the first recording layer 72.

[0103] However, photograph 72B may be formed by sandwiching a separately formed printed matter or the like between supporting base 71 and transparent layer 73, or may be printed separately on supporting base 71. Similarly, background portion 72C may be formed by sandwiching a separately formed printed matter or the like between supporting base 71 and transparent layer 73, or may be printed separately on supporting base 71.

[0104] The display portion 72A, the photograph 72B, and the background portion 72C have flat surfaces. As described later, the display portion 72A, the photograph 72B, and the background portion 72C are formed by irradiating the unrecorded first recording layer 72 with laser light, so that the display portion 72A, the photograph 72B, and the background portion 72C have flat surfaces.

[0105] (Second recording layer) The second recording layer 74 is provided facing the first recording layer 72. The second recording layer 74 contains, for example, the same material as the light-shielding pattern layer 12 in the first embodiment. The second recording layer 74 includes a light-shielding pattern section 74A and a character drawing section 74B. The light-shielding pattern section 74A is provided facing the display section 72A. The light-shielding pattern section 74A has a configuration similar to that of the light-shielding pattern layer 12 in the first embodiment. That is, the light-shielding pattern section 74A has a light-shielding section 12BK and a light-transmitting section 12TR that are alternately arranged (see FIG. 1 and FIG. 2). The characters included in the character drawing section 74B are formed by a dye included in the second recording layer 74. Specifically, the characters included in the character drawing section 74B are formed by a color reaction between an electron-donating dye and an electron-accepting substance included in the second recording layer 74. However, the characters included in the character drawing section 74B may be formed by printing or the like on the transparent layer 73.

[0106] The light-shielding pattern portion 74A and the character drawing portion 74B have flat surfaces. As described later, the light-shielding pattern portion 74A and the character drawing portion 74B are formed by irradiating the unrecorded second recording layer 74 with a laser beam, and therefore the light-shielding pattern portion 74A and the character drawing portion 74B have flat surfaces.

[0107] (transparent layer) The transparent layer 73 is provided between the first recording layer 72 and the second recording layer 74. The transparent layer 73 is similar to the transparent layer 13 in the first embodiment.

[0108] (protective layer) The protective layer 75 protects the surface of the second recording layer 74. The protective layer 75 is, for example, a transparent film or coating layer.

[0109] (Image display element) An image display element 76 is configured by the display section 72A, a light-shielding pattern section 74A provided opposite the display section 72A, and a transparent layer 73 provided between the display section 72A and the light-shielding pattern section 74A.

[0110] [Manufacturing method of image display element] An example of a method for manufacturing the card 70 according to the seventh embodiment of the present disclosure will now be described.

[0111] (Lamination process) First, a paint for forming a recording layer is applied onto a support substrate 71 and dried at, for example, 70°C. As a result, a first recording layer 72 in an unrecorded state is formed. Next, a film is laminated onto the first recording layer 72, or a resin is applied and cured to form a transparent layer 73. Next, a paint for forming a recording layer is applied onto the transparent layer 73 and dried at, for example, 70°C. As a result, a second recording layer 74 in an unrecorded state is formed. As a result, an unrecorded card 70 is obtained.

[0112] The first recording layer 72 and the second recording layer 74 may be formed by a method other than the above coating. For example, the first recording layer 72 and the second recording layer 74 may be formed in advance on separate substrates, and then bonded to the supporting substrate 71 and the transparent layer 73 via adhesive layers, respectively.

[0113] (Drawing process) Next, in the same manner as in the manufacturing method of the image display element 10 according to the first embodiment (see FIG. 4B), near-infrared laser light L1 and near-infrared laser light L2, whose wavelength and output have been adjusted, are irradiated to desired positions of the first recording layer 72 and the second recording layer 74, respectively, by, for example, a semiconductor laser. As a result, the photothermal conversion materials contained in the first recording layer 72 and the second recording layer 74 generate heat, and a color reaction (coloring reaction) occurs between the electron donor dye and the electron acceptor substance, causing the irradiated portions to develop color. As a result, the display portion 72A, the photograph 72B, and the background portion 72C are formed in the first recording layer 72. Also, the light-shielding pattern portion 74A and the character drawing portion 74B are formed in the second recording layer 74. 17B, ​​the photograph 72B and the background portion 72C are formed on the first recording layer 72, and the character drawing portion 74B is formed on the second recording layer 74, but the layers on which the photograph 72B, the character drawing portion 74B, and the background portion 72C are formed do not need to be specified, and they may be formed on the first recording layer 72 or the second recording layer 74. That is, the first recording layer 72 may have at least one of the photograph 72B, the character drawing portion 74B, and the background portion 72C (design, etc.) formed by a dye, and the second recording layer 74 may have at least one of the photograph 72B, the character drawing portion 74B, and the background portion 72C (design, etc.) formed by a dye.

[0114] It is also possible to rewrite the display section 72A, the photograph 72B and the background section 72C formed on the first recording layer 72, and the light-shielding pattern section 74A and the character drawing section 74B formed on the second recording layer 74.

[0115] (Protective layer forming process) Next, a transparent film is attached onto the second recording layer 74 via an adhesive layer, or a resin is applied and cured to form the protective layer 75. The protective layer 75 may be formed before the drawing step. In that case, the laser light for drawing on the first recording layer 72 and the second recording layer 74 is irradiated through the protective layer 75.

[0116] [Effects] As described above, the card 70 according to the seventh embodiment includes the image display element 76, making it difficult to counterfeit the card 70 and enabling easy determination of whether the card 70 is genuine or counterfeit.

[0117] The card 70 includes a first recording layer 72, a second recording layer 74 provided opposite the first recording layer 72, and a transparent layer 73 provided between the first recording layer 72 and the second recording layer 74. This allows the display section 72A, the photograph 72B, the background section 72C, the light-shielding pattern section 74A, and the character drawing section 74B to be formed by irradiating the first recording layer 72 and the second recording layer 74 with laser light L1 and laser light L2, respectively. Therefore, the display section 72A, the photograph 72B, the background section 72C, the light-shielding pattern section 74A, and the character drawing section 74B can be formed simultaneously with the formation of the image display element 76. Thus, the card 70 can be easily produced.

[0118] The light-shielding pattern portion 74A and the character drawing portion 74B have flat surfaces because they are formed by irradiating the second recording layer 74, which has a flat surface, with the laser light L2. Therefore, when a film is laminated onto the second recording layer 74 to form the protective layer 75, it is possible to prevent air bubbles from being trapped at the interfaces between the light-shielding pattern portion 74A and the character drawing portion 74B and the protective layer 75. Therefore, it is possible to prevent air bubbles from remaining at the interfaces after lamination.

[0119] <8 Eighth embodiment> FIG. 18 is a plan view showing an example of the configuration of a card 80 according to an eighth embodiment of the present disclosure. The card 80 comprises a supporting base 81 , an image display element 82 and an adhesive layer 83 provided on the supporting base 81 , and a protective layer 84 attached to the supporting base 81 via the adhesive layer 83 .

[0120] (Support base) The supporting base 81 is for supporting the image display element 82. The supporting base 81 includes, for example, a polymer resin. At least one of characters, a photograph, and a background (for example, a design, a picture, characters, or a combination thereof, etc.) may be provided on the supporting base 81 by printing or the like.

[0121] (adhesive layer) The adhesive layer 83 is provided so as to surround the image display element 82, and bonds the support substrate 81 and the protective layer 84. In this specification, pressure sensitive adhesion is defined as a type of adhesion. According to this definition, the adhesive layer is considered to be a type of adhesive layer 83.

[0122] (Image display element) The image display element 82 is any one of the image display elements 10 to 60 according to the first to sixth embodiments.

[0123] (protective layer) The protective layer 84 is for protecting the image display element 82, printing, and the like provided on the supporting substrate 81. The protective layer 84 is, for example, a film having transparency.

[0124] [Effects] As described above, the card 80 according to the eighth embodiment includes the image display element 82, making it difficult to counterfeit the card 80 and enabling easy determination of whether the card 80 is genuine or counterfeit.

[0125] <8 Variation> [Variation 1] In the first embodiment, an example in which the display layer 11 displays the first image 111 and the second image 112 has been described. However, as shown in FIG. 19, the display layer 11 may display the first to n-th images (where n is an integer of 2 or more). In this case, the display layer 11 contains a dye, and the first to n-th images are formed by the dye. More specifically, the display layer 11 contains an electron donor dye and an electron acceptor material, and the first to n-th images are formed by a color reaction between the electron donor dye and the electron acceptor material. The first to n-th images are each divided into discrete image elements 111-11n corresponding to the arrangement pattern of the light transmitting portions 12TR. The image elements 111-11n of the first to n-th images are repeatedly arranged in the in-plane direction of the display layer 11 in the order of the image elements 111-11n of the first to n-th images. It is preferable that the ratio (W1:W2) of the width W1 of the light-shielding portion 12BK to the width W2 of the light-transmitting portion 12TR is about (n-1):1, specifically, (n-1):0.9 to (n-1):1.1. Each of the image elements 111-11n has substantially the same width as the light-transmitting portion 12TR. Here, "substantially the same width" means that the ratio (W2:W3) of the width W2 of the light-transmitting portion 12TR to the width W3 of each image element 111-11n is in the range of 1:0.9 to 1:1.1.

[0126] Similarly, in the second to sixth embodiments, the display layers 11, 21, 31, 44, 61 may display the first to nth images (where n is an integer of 2 or more). Similarly, in the seventh embodiment, the first recording layer 72 may display the first to nth images (where n is an integer of 2 or more).

[0127] [Variation 2] In the first to sixth embodiments, the reaction between the electron donor dye and the electron acceptor substance contained in the display layer 11, 21, 31, 44, 61 and the light-shielding pattern layer 12, 32, 62 is reversible, but the reaction between the electron donor dye and the electron acceptor substance may be irreversible. Similarly, the reaction between the electron donor dye and the electron acceptor substance contained in the first recording layer 72 and the second recording layer 74 in the seventh embodiment may be irreversible. When the reaction is irreversible as described above, a developer is used as the electron acceptor substance instead of a developer / reducer. When the reaction is irreversible as described above, it becomes difficult to rewrite the image, and security can be improved.

[0128] [Variation 3] In the first embodiment, an example has been described in which both the display layer 11 and the light-shielding pattern layer 12 contain a pigment, but at least one of the display layer 11 and the light-shielding pattern layer 12 may contain a pigment.

[0129] Of the display layer 11 and the light-shielding pattern layer 12, when the display layer 11 contains a dye, the first image 111 and the second image 112 are formed by this dye.

[0130] Of the display layer 11 and the light-shielding pattern layer 12, in the case where the light-shielding pattern layer 12 contains a dye, the light-shielding portion 12BK is formed by the dye.

[0131] Of the display layer 11 and the light-shielding pattern layer 12, when the display layer 11 does not contain a pigment, the first image 111 and the second image 112 may be formed with printing ink.

[0132] In the case where the light-shielding pattern layer 12 does not contain a pigment, the light-shielding portion 12BK may be formed of a printing ink containing a pigment such as carbon black, or may be formed of a color resist. The light-transmitting portion 12TR may be formed of a transparent resin, or may be formed as a space.

[0133] In the second to sixth embodiments, the display layers 11, 21, 31, 44, 61 and the light-shielding pattern layers 12, 32, 62 may have the same configuration as in the above-mentioned modified example 3. In the seventh embodiment, the first recording layer 72 and the second recording layer 74 may have the same configuration as in the above-mentioned modified example 3.

[0134] [Variation 4] In the first embodiment, an example in which both the display layer 11 and the light-shielding pattern layer 12 contain an electron-donating dye and an electron-accepting substance has been described, but at least one of the display layer 11 and the light-shielding pattern layer 12 may contain an electron-donating dye and an electron-accepting substance. In this case, the layer containing the electron-donating dye and the electron-accepting substance preferably contains a photothermal conversion material or a polymer material, and more preferably contains both of these materials.

[0135] When the display layer 11 of the light-shielding pattern layer 12 contains an electron-donating dye and an electron-accepting substance, a first image 111 and a second image 112 are formed by a reaction between the electron-donating dye and the electron-accepting substance.

[0136] When the light-shielding pattern layer 12 out of the display layer 11 and the light-shielding pattern layer 12 contains an electron-donating dye and an electron-accepting substance, a light-shielding portion 12BK is formed by a reaction between the electron-donating dye and the electron-accepting substance.

[0137] Of the display layer 11 and the light-shielding pattern layer 12, when the display layer 11 does not contain an electron-donating dye and an electron-accepting substance, the first image 111 and the second image 112 may be formed with printing ink.

[0138] In the case where the light-shielding pattern layer 12 does not contain an electron-donating dye or an electron-accepting substance, the light-shielding portion 12BK may be formed of a printing ink containing a pigment such as carbon black, or may be formed of a color resist. The light-transmitting portion 12TR may be formed of a transparent resin, or may be formed as a space.

[0139] In the second to sixth embodiments, the display layers 11, 21, 31, 44, 61 and the light-shielding pattern layers 12, 32, 62 may have the same configuration as in the above-mentioned modified example 4. In the seventh embodiment, the first recording layer 72 and the second recording layer 74 may have the same configuration as in the above-mentioned modified example 4.

[0140] [Variation 5] The configuration of the first recording layer 72 and the second recording layer 74 described in the seventh embodiment is an example, and the configuration of the first recording layer 72 and the second recording layer 74 is not limited to this example. For example, the configuration of the first recording layer 72 and the second recording layer 74 may be the configuration described below.

[0141] In the seventh embodiment, the first recording layer 72 may have a three-layer structure similar to the display layer 21 in the second embodiment. In this case, the display portion 72A, the photograph 72B, and the background portion 72C are formed by the dyes contained in the first layer 22, the second layer 23, and the third layer 24. More specifically, they are formed by a color reaction between the electron-donating dye and the electron-accepting substance contained in the first layer 22, the second layer 23, and the third layer 24.

[0142] In the seventh embodiment, the second recording layer 74 may have a three-layer structure similar to the display layer 21 in the second embodiment. In this case, the light-shielding pattern portion 74A and the character drawing portion 74B are formed by the dyes contained in the first layer 22, the second layer 23, and the third layer 24. More specifically, they are formed by a color reaction between the electron-donating dye and the electron-accepting substance contained in the first layer 22, the second layer 23, and the third layer 24.

[0143] In the seventh embodiment, the first recording layer 72 may have a configuration similar to that of the display layer 31 in the third embodiment. In this case, the display portion 72A, the photograph 72B, and the background portion 72C are formed by three types of microcapsules 31C, 31M, and 31Y (specifically, the dyes contained in these three types of microcapsules 31C, 31M, and 31Y, respectively).

[0144] In the seventh embodiment, the second recording layer 74 may have a configuration similar to that of the display layer 31 in the third embodiment. In this case, the light-shielding pattern portion 74A and the character drawing portion 74B are formed by three types of microcapsules 31C, 31M, and 31Y (specifically, the dyes contained in these three types of microcapsules 31C, 31M, and 31Y, respectively).

[0145] In the seventh embodiment, the first recording layer 72 may have a configuration similar to that of the display layer 44 in the fourth embodiment. In this case, the display portion 72A, the photograph 72B, and the background portion 72C are formed by the dyes contained in the first display layer 41 and the second display layer 42. More specifically, they are formed by a color reaction between an electron-donating dye and an electron-accepting substance contained in the first display layer 41 and the second display layer 42.

[0146] In the seventh embodiment, the display section 72A may have a configuration similar to that of the display layer 61 in the sixth embodiment, and the light-shielding pattern section 74A may have a configuration similar to that of the light-shielding pattern layer 62 in the sixth embodiment.

[0147] [Variation 6] In the above first embodiment, the display layer 11 and the light-shielding pattern layer 12 are described as including a single (one type) electron-donating dye, but the configuration of the display layer 11 and the light-shielding pattern layer 12 is not limited to this. The display layer 11 and the light-shielding pattern layer 12 may include a plurality of types of electron-donating dyes that exhibit different colors. In this way, the display layer 11 and the light-shielding pattern layer 12 include a plurality of types of electron-donating dyes, and thus it becomes possible to reproduce various colors including the Japan colors CMY. For example, the color cyan can be reproduced by mixing a blue electron-donating dye and a green electron-donating dye in a predetermined ratio. The color magenta can be reproduced by mixing a red electron-donating dye and an orange electron-donating dye in a predetermined ratio.

[0148] Similarly, in the second, fourth to sixth embodiments, the display layers 11, 21, 44, 61 and the light-shielding pattern layers 12, 62 may contain multiple types of electron-donating dyes that exhibit different colors. In the third embodiment, the microcapsules 31C, 31M, 31Y may each contain multiple types of electron-donating dyes. In the seventh embodiment, the first recording layer 72 and the second recording layer 74 may each contain multiple types of electron-donating dyes that exhibit different colors.

[0149] [Variation 7] In the first embodiment, an example has been described in which, when the display surface S1 is viewed from the vertical direction, the image element 111A (i.e., the first image 111 (see viewpoint 2 in FIG. 2)) is seen from the light-transmitting portion 12TR, and, when the display surface S1 is viewed from an oblique direction of a specified angle ±θ, the image element 112A (i.e., the second image 112 (see viewpoints 1 and 3 in FIG. 2)) is seen from the light-transmitting portion 12TR. However, the configuration of the image display element is not limited to this. For example, when the display surface S1 is viewed from an oblique direction of a first specified angle ±θ1, the image element 111A (i.e., the first image 111) may be seen from the light-transmitting portion 12TR, and, when the display surface S1 is viewed from an oblique direction of a second specified angle ±θ2 different from the first specified angle ±θ1, the image element 112A (i.e., the second image 112) may be seen from the light-transmitting portion 12TR. Such a configuration may also be adopted in the second to eighth embodiments.

[0150] Although the embodiments and modified examples of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments and modified examples, and various modifications based on the technical ideas of the present disclosure are possible.

[0151] For example, the configurations, methods, steps, shapes, materials, and values ​​given in the above-mentioned embodiments and modifications are merely examples, and different configurations, methods, steps, shapes, materials, and values ​​may be used as necessary. The configurations, methods, steps, shapes, materials, and values ​​of the above-mentioned embodiments and modifications can be combined with each other without departing from the spirit of this disclosure.

[0152] In the numerical ranges described in stages in the above-mentioned embodiments and modifications, the upper or lower limit of a numerical range in a certain stage may be replaced with the upper or lower limit of a numerical range in another stage. The materials exemplified in the above-mentioned embodiments and modifications may be used alone or in combination of two or more, unless otherwise specified.

[0153] The present disclosure may also employ the following configuration. (1) a display layer for displaying first to nth (n is an integer of 2 or more) images; a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; a transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with the display layer contains a dye, and the first to nth images are formed by the dye; each of the first to n-th images is divided at intervals in accordance with an arrangement pattern of the light-transmitting portions; An image display element in which an image seen through the light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed. (2) The image display element according to (1), wherein the light-shielding pattern layer contains a dye, and the light-shielding portion is formed by the dye. (3) The image display element according to (2), wherein the light-shielding pattern layer has a flat surface. (4) the pigment contained in the light-shielding portion is in a colored state, The image display element according to (2) or (3), wherein the dye contained in the light-transmitting portion is in a decolorized state. (5) the dye contained in the display layer and the dye contained in the light-shielding pattern layer are electron-donating dyes, The image display element according to any one of (2) to (4), wherein the display layer and the light-shielding pattern layer further contain an electron-accepting substance. (6) 6. The image display element according to claim 5, wherein the reaction between the electron-donating dye and the electron-accepting substance is reversible. (7) the display layer and the light-shielding pattern layer each contain a photothermal conversion material; The image display element according to (5) or (6), wherein the photothermal conversion material contained in the display layer and the photothermal conversion material contained in the light-shielding pattern layer have absorption wavelengths different from each other. (8) The image display element according to any one of (1) to (7), wherein a ratio (W1:W2) of a width W1 of the light-shielding portion to a width W2 of the light-transmitting portion is approximately (n-1):1. (9) each of the first to n-th images is divided into discrete image elements in accordance with an arrangement pattern of the light-transmitting portions; An image display element described in any of (1) to (8), wherein the image elements of the first to nth images are repeatedly arranged in the in-plane direction of the display layer in the order of the image elements of the first to nth images. (10) The image display element according to any one of (1) to (9), wherein the light blocking portion is arranged in a striped pattern. (11) the display layer includes a first layer, a second layer, and a third layer; The image display element according to any one of (1) to (10), wherein the first layer, the second layer, and the third layer contain dyes exhibiting different colors from each other. (12) a display layer for displaying first to nth (n is an integer of 2 or more) images; a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; a transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with At least one of the display layer and the light-shielding pattern layer contains a pigment, When the display layer contains the dye, the first to nth images are formed by the dye, When the light-shielding pattern layer contains the dye, the light-shielding portion is formed by the dye, each of the first to n-th images is divided at intervals in accordance with an arrangement pattern of the light-transmitting portions; An image display element in which an image seen through the light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed. (13) A display layer; a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; a first transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with The display layer is a first display layer for displaying a first image; a second display layer disposed opposite the first display layer and configured to display a second image; a second transparent layer provided between the first display layer and the second display layer; Equipped with the first display layer and the second display layer each contain a dye, and the first image and the second image are formed by the dye; the first image and the second image are each divided at intervals in accordance with an arrangement pattern of the light-transmitting portions, An image display element in which an image seen through the light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed. (14) A drawing body comprising an image display element according to any one of (1) to (13). (15) A first recording layer; a second recording layer provided opposite to the first recording layer; a transparent layer provided between the first recording layer and the second recording layer; Equipped with the first recording layer includes display sections for displaying first to nth (n is an integer of 2 or more) images; the first recording layer contains a dye, and the first to nth images are formed by the dye; the second recording layer is provided opposite to the display section and includes a light-shielding pattern section having light-shielding sections and light-transmitting sections alternately arranged; each of the first to n-th images is divided at intervals in accordance with an arrangement pattern of the light-transmitting portions; A drawing body in which an image seen through the light-shielding pattern portion changes depending on an angle at which the light-shielding pattern portion is viewed. (16) The image body according to (15), wherein the first recording layer has at least one of a photograph, a letter, and a design formed by the dye. (17) The image forming body according to (15) or (16), wherein the second recording layer contains a dye, and the light-shielding portion is formed by the dye. (18) The image body according to (17), wherein the second recording layer has at least one of a photograph, a letter, and a design formed by the dye contained in the second recording layer. (19) A first recording layer; a second recording layer provided opposite to the first recording layer; a transparent layer provided between the first recording layer and the second recording layer; Equipped with the first recording layer includes display sections for displaying first to nth (n is an integer of 2 or more) images; the second recording layer is provided opposite to the display section and includes a light-shielding pattern section having light-shielding sections and light-transmitting sections alternately arranged; At least one of the first recording layer and the second recording layer contains a dye, When the first recording layer contains the dye, the first to nth images are formed by the dye, When the second recording layer contains the dye, the light-shielding portion is formed by the dye, each of the first to n-th images is divided at intervals in accordance with an arrangement pattern of the light-transmitting portions; A drawing body in which an image seen through the light-shielding pattern portion changes depending on an angle at which the light-shielding pattern portion is viewed. [Explanation of symbols]

[0154] 10, 20, 30, 40, 50, 60, 76, 82 Image display element 10A, 20A, 40A laminate 11, 21, 31, 44, 61 display layer 111~11n Image elements 11A, 21A, 41A 1st recording layer 12, 32, 62 Light-shielding pattern layer 12A, 42A Second recording layer 12BK, 62BK light shielding area 12TR, 62TR transparent section 13 Transparent layer 22 First Layer 23 Second Layer 24 The Third Layer 25, 26 Thermal insulation layer 22A, 23A, 24A, 111B, 112B Coloring section 22B, 23B, 24B Non-colored area 43A 3rd recording layer 51 Back layer 70, 80 cards 71, 81 Supporting base 72 First recording layer 72A Display section 72A 72B Photo 72C Background section 73 Transparent layer 74 Second recording layer 74A Light shielding pattern section 74B Character drawing section 75, 84 protective layer 83 Adhesive layer 111 First Image 111A, 411A, 611A Image Elements 112 Second Image 112A, 412A, 612A Image Elements 412A, 422A Separation section S1 display surface S2 back L1, L2, L3, L4 laser light

Claims

1. A display layer including a first layer, a second layer, and a third layer, and displaying first to nth images (where n is an integer of 2 or more); a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; a transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with the first layer, the second layer and the third layer contain dyes exhibiting colors different from one another, and the first to n-th images are formed by the dyes; the first to n-th images are each divided at intervals in accordance with an arrangement pattern of the light-transmitting portions, An image display element in which an image seen through the light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed.

2. The image display element according to claim 1 , wherein the light-shielding pattern layer contains a dye, and the light-shielding portion is formed by the dye.

3. The image display element according to claim 2 , wherein the light-shielding pattern layer has a flat surface.

4. the pigment contained in the light-shielding portion is in a colored state, The image display element according to claim 2 , wherein the dye contained in the light transmitting portion is in a decolorized state.

5. The dye contained in each of the first layer, the second layer, the third layer and the light-shielding pattern layer is an electron-donating dye, The image display element according to claim 2 , wherein each of the first layer, the second layer, the third layer and the light-shielding pattern layer further contains an electron-accepting material.

6. 6. The image display device according to claim 5, wherein the reaction between the electron-donating dye and the electron-accepting substance is reversible.

7. The first layer, the second layer, the third layer and the light-shielding pattern layer each contain a photothermal conversion material, The image display element according to claim 5 , wherein the photothermal conversion materials contained in the first layer, the second layer, the third layer and the light-shielding pattern layer have absorption wavelengths different from each other.

8. 2. The image display element according to claim 1, wherein a ratio (W1:W2) of a width W1 of the light-shielding portion to a width W2 of the light-transmitting portion is approximately (n-1):

1.

9. each of the first to n-th images is divided into discrete image elements in accordance with an arrangement pattern of the light-transmitting portions; 2 . The image display device according to claim 1 , wherein the image elements of the first to nth images are repeatedly arranged in an in-plane direction of the display layer in the order of the image elements of the first to nth images.

10. 2. The image display device according to claim 1, wherein the light blocking portions are arranged in a striped pattern.

11. A display layer; a light-shielding pattern layer provided opposite the display layer and having light-shielding portions and light-transmitting portions alternately arranged; a first transparent layer provided between the display layer and the light-shielding pattern layer; Equipped with The display layer is a first display layer that displays a first image; a second display layer disposed opposite the first display layer and configured to display a second image; a second transparent layer provided between the first display layer and the second display layer; Equipped with At least one of the first display layer and the second display layer includes a first layer, a second layer, and a third layer; the first layer, the second layer, and the third layer contain pigments exhibiting different colors from one another; the first image and the second image are displayed on the first display layer and the second display layer, respectively; When the first display layer includes the first layer, the second layer, and the third layer, the first image is formed by the dye, When the second display layer includes the first layer, the second layer, and the third layer, the second image is formed by the dye, the first image and the second image are each divided at intervals in accordance with an arrangement pattern of the light-transmitting portions, An image display element in which an image seen through the light-shielding pattern layer changes depending on the angle at which the light-shielding pattern layer is viewed.

12. A drawing body comprising the image display element according to claim 1 .

13. A first recording layer including a first layer, a second layer, and a third layer; a second recording layer provided opposite to the first recording layer; a transparent layer provided between the first recording layer and the second recording layer; Equipped with the first recording layer includes display sections for displaying first to nth (n is an integer of 2 or more) images, the first layer, the second layer and the third layer contain dyes exhibiting colors different from one another, and the first to n-th images are formed by the dyes; the second recording layer is provided opposite to the display section and includes a light-shielding pattern section having light-shielding sections and light-transmitting sections alternately arranged; the first to n-th images are each divided at intervals in accordance with an arrangement pattern of the light-transmitting portions, A drawing body in which an image seen through the light-shielding pattern portion changes depending on an angle at which the light-shielding pattern portion is viewed.

14. The image body according to claim 13 , wherein the first recording layer comprises at least one of a photograph, a character, and a design formed by the dye.

15. The image forming body according to claim 13 , wherein the second recording layer contains a dye, and the light-shielding portion is formed by the dye.

16. The image body according to claim 15 , wherein the second recording layer has at least one of a photograph, a character, and a design formed by the dye contained in the second recording layer.

Images