Display body

Abstract

Provided is a display technique that enables special image display. This display body (1A) comprises: a transparent material layer (2) having a first main surface (S1) and a second main surface (S2); a mask layer (3) provided on the first main surface and having light transmission portions (32) regularly arranged; and an image display layer provided on the second main surface. The image display layer includes a first layer (4B) for displaying a first color, and a second layer (4R) for displaying a second color different from the first color. The first layer includes first portions (41B) arranged, in one arrangement direction of the light transmission portions, at the same pitch as the pitch of the light transmission portions in the one arrangement direction. The second layer includes second portions (41R) arranged alternately with the first portions in the aforementioned arrangement direction. The first and second portions each include a first region which can be observed through one of the light transmission portions when observed from a normal direction perpendicular to the first main surface, and a second region which cannot be observed through any of the light transmission portions when observed from the normal direction.

Description

display body

[0001] The present invention relates to display technology.

[0002] In recent years, the performance of digital devices such as scanners, printers, and color copiers has improved, making it easy to create elaborate copies of valuable printed materials. To prevent such copying and counterfeiting, anti-counterfeiting technologies are needed. Among the aforementioned anti-counterfeiting technologies, there is a particular need for anti-counterfeiting technologies, such as watermarks and holograms, that do not require tools and allow anyone who holds a printed material to distinguish its authenticity.

[0003] One anti-counterfeiting technology that allows for tool-free authentication is the use of optically variable inks containing functional pigments (also known as optical interference pigments) that change color in response to changes in light interference conditions. Images displayed on printed layers formed using these inks change color in response to changes in the lighting direction or observation direction, allowing discriminators to determine the authenticity of printed materials by checking the color change.

[0004] Typical examples of optically variable inks include pearl ink and OVI (Optical Variable Ink), which are used on banknotes, etc. Images printed using the former change from colorless to pink, for example, as the lighting direction or viewing direction changes. Images printed using the latter change from blue-green to purple, for example, as the lighting direction or viewing direction changes.

[0005] By utilizing the color changes of these optically variable inks, even more complex color changes can be produced. For example, Patent Document 1 describes a method in which a plurality of first image lines containing an optical interference pigment are arranged regularly in the width direction, each of which has a substantially semicircular cross section perpendicular to the length direction, and a plurality of second image lines, each of which exhibits a different color from the first image lines under conditions of observation with specularly reflected light, are arranged on the first image lines so that a portion of the surface of the first image line is exposed. When the observation direction of the printed matter obtained in this manner is changed in a plane perpendicular to the length direction of the first image lines, the ratio between the intensity of specularly reflected light from the first image lines and the intensity of specularly reflected light from the second image lines changes, and the color of the image displayed by those image lines changes. This image can then undergo further color changes due to the optical interference pigment.

[0006] Japanese Patent Application Publication No. 2014-83721

[0007] An object of the present invention is to provide a display technology that enables special image display.

[0008] According to one aspect of the present invention, there is provided a display device comprising: a transparent material layer having a first main surface and a second main surface opposite the first main surface; a mask layer provided on the first main surface and having a plurality of regularly arranged light-transmitting portions; and an image display layer provided on the second main surface, wherein the image display layer includes a first layer that displays a first color and a second layer that displays a second color different from the first color, the first layer including a plurality of first portions arranged in a first arrangement direction of the plurality of light-transmitting portions at the same pitch as the pitch of the plurality of light-transmitting portions in the first arrangement direction, and the second layer including a plurality of second portions arranged alternately with the plurality of first portions in the first arrangement direction, wherein each of the plurality of first portions and the plurality of second portions includes one or more first regions that are observable through one of the plurality of light-transmitting portions when observed from a normal direction perpendicular to the first main surface, and one or more second regions that are not observable through any of the plurality of light-transmitting portions when observed from the normal direction.

[0009] According to another aspect of the present invention, there is provided a display according to the above aspect, wherein the mask layer has a light-blocking property.

[0010] According to yet another aspect of the present invention, there is provided a display device according to any of the above aspects, wherein the portion of the mask layer in which the plurality of light-transmitting portions are provided has an aperture ratio in the range of 10% to 90%.

[0011] According to yet another aspect of the present invention, there is provided a display device relating to any of the above aspects, wherein the ratio S1 / S2 of the total area S1 of the first regions for all of the plurality of first portions and the plurality of second portions to the total area S2 of the plurality of light-transmitting portions is in the range of 10% to 100%.

[0012] According to yet another aspect of the present invention, there is provided the display according to any one of the above aspects, wherein the arrangement of the plurality of first portions and the arrangement of the plurality of second portions have the same shape.

[0013] According to yet another aspect of the present invention, there is provided a display device relating to any of the above aspects, wherein each of the plurality of light-transmitting portions is strip-shaped and regularly arranged in the width direction, and each of the plurality of first portions and the plurality of second portions extends in the length direction of the plurality of light-transmitting portions.

[0014] According to yet another aspect of the present invention, there is provided a display according to the above aspect, in which the plurality of light-transmitting portions are arranged in a stripe pattern.

[0015] Alternatively, according to yet another aspect of the present invention, there is provided a display according to the above aspect, in which the plurality of light transmitting portions are arranged in a nested manner.

[0016] According to yet another aspect of the present invention, there is provided the display element according to any one of the above aspects, wherein the portion of the mask layer where the plurality of light transmitting portions are provided is in a lattice pattern.

[0017] According to yet another aspect of the present invention, there is provided a display device relating to the above aspect, wherein each of the plurality of first portions and the plurality of second portions has a shape extending in a second arrangement direction of the plurality of light-transmitting portions.

[0018] According to yet another aspect of the present invention, there is provided the display according to the above aspect, wherein each of the plurality of first portions and the plurality of second portions has one side along its length that is wavy.

[0019] According to yet another aspect of the present invention, there is provided the display element according to any one of the above aspects, wherein the portion of the mask layer where the plurality of light transmitting portions are provided is in a checkerboard pattern.

[0020] According to yet another aspect of the present invention, there is provided a display device relating to the above aspect, in which the plurality of first portions are arranged in a checkerboard pattern corresponding to the plurality of light-transmitting sections, and the plurality of first portions and the plurality of second portions are arranged alternately in each of the first arrangement direction of the plurality of light-transmitting sections and the second arrangement direction of the plurality of light-transmitting sections.

[0021] According to yet another aspect of the present invention, there is provided a display according to any one of the above aspects, further comprising a back surface layer facing the second main surface with the image display layer sandwiched therebetween.

[0022] According to yet another aspect of the present invention, there is provided the indicator according to the above aspect, wherein the back surface layer is a reflective layer or is made of ink containing a light-reflecting or light-scattering pigment.

[0023] According to yet another aspect of the present invention, a maximum value Rpf1 of reflectance measured in a wavelength range of 400 to 700 nm through the light transmitting portion for the plurality of first portions, an average value Raf1 of reflectance measured in a wavelength range of 400 to 700 nm through the light transmitting portion for the plurality of first portions, a maximum value Rpf2 of reflectance measured in a wavelength range of 400 to 700 nm through the light transmitting portion for the plurality of second portions, and a reflectance value Rpf3 of reflectance measured in a wavelength range of 400 to 700 nm through the light transmitting portion for the plurality of second portions. A display according to any of the above aspects is provided, in which an average value Raf2 of reflectance measured within a wavelength range of 400 to 700 nm through the back surface, a maximum value Rpb of reflectance measured within a wavelength range of 400 to 700 nm for the surface of the back surface layer opposite to the surface facing the second main surface, and an average value Rab of reflectance measured within a wavelength range of 400 to 700 nm for the surface of the back surface layer opposite to the surface facing the second main surface satisfy the relationships shown in the following formulas (1) to (5). Raf1≧20% ... (1) Raf2≧20% ... (2) Rab≧30% ... (3) (Rpf1−Raf1)−(Rpb−Rab)≧10% ... (4) (Rpf2−Raf2)−(Rpb−Rab)≧10% ... (5) According to yet another aspect of the present invention, there is provided a display element according to any of the above aspects, wherein the mask layer is a black layer, a white layer, or a metal layer.

[0024] According to yet another aspect of the present invention, there is provided a display element according to any of the above aspects, wherein the mask layer includes a light-shielding layer and a colored layer facing the first main surface with the light-shielding layer sandwiched therebetween.

[0025] According to yet another aspect of the present invention, there is provided a label comprising a display body according to any of the above aspects and an adhesive layer facing the second main surface with the image display layer sandwiched therebetween.

[0026] According to yet another aspect of the present invention, there is provided an article with a display member, comprising the display member according to any one of the above aspects and an article supporting the display member.

[0027] According to yet another aspect of the present invention, the article has a support surface, and the display body is supported by the article so that the second main surface faces the support surface with the image display layer sandwiched therebetween, and a color difference ΔE ＊ ａｂ The present invention provides an article with a display body according to the above aspect, wherein the value of the display body is 5 or less.

[0028] FIG. 1 is a top view of a display according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the display shown in FIG. 1 taken along line II-II. FIG. 3 is a diagram schematically illustrating a state in which an observer is observing an image displayed by the display shown in FIGS. 1 and 2 under certain observation conditions. FIG. 4 is an enlarged view of an image displayed by the display shown in FIGS. 1 and 2 under the observation conditions of FIG. 3. FIG. 5 is a diagram schematically illustrating a state in which an observer is observing an image displayed by the display shown in FIGS. 1 and 2 under other observation conditions. FIG. 6 is an enlarged view of an image displayed by the display shown in FIGS. 1 and 2 under the observation conditions of FIG. 5. FIG. 7 is a diagram schematically illustrating a state in which an observer is observing an image displayed by the display shown in FIGS. 1 and 2 under still other observation conditions. FIG. 8 is an enlarged view of an image displayed by the display shown in FIGS. 1 and 2 under the observation conditions of FIG. 7. FIG. 9 is a diagram schematically illustrating a state in which an observer is observing an image displayed by the display shown in FIGS. 1 and 2 under still other observation conditions. FIG. 10 is an enlarged view of an image displayed by the display shown in FIGS. 1 and 2 under the observation conditions of FIG. 9. FIG. 11 is a diagram schematically showing a state in which an observer observes an image displayed by the display member shown in FIGS. 1 and 2 under still another observation condition. FIG. 12 is a diagram showing an enlarged view of an image displayed by the display member shown in FIGS. 1 and 2 under the observation condition of FIG. 11. FIG. 13 is a diagram showing an enlarged view of an image displayed by a display member according to a second embodiment of the present invention under certain observation conditions. FIG. 14 is a diagram showing a structure obtained by omitting the mask layer from the display member shown in FIG. 13. FIG. 15 is a diagram showing an enlarged view of an image displayed by a display member according to a third embodiment of the present invention under certain observation conditions. FIG. 16 is a diagram showing a structure obtained by omitting the mask layer from the display member shown in FIG. 15. FIG. 17 is a diagram showing an enlarged view of an image displayed by a display member according to a fourth embodiment of the present invention under certain observation conditions. FIG. 18 is a diagram showing a structure obtained by omitting the mask layer from the display member shown in FIG. 17. FIG. 19 is a cross-sectional view of a display member according to a fifth embodiment of the present invention. FIG. 20 is a cross-sectional view of a display member according to a sixth embodiment of the present invention. FIG. 21 is a cross-sectional view of a label according to a seventh embodiment of the present invention. FIG. 22 is a cross-sectional view of an article with a display member according to an eighth embodiment of the present invention. FIG. 23 is a cross-sectional view of an article with a display member according to a ninth embodiment of the present invention.Fig. 24 is a diagram schematically showing a state in which an observer observes an image displayed by a display according to a tenth embodiment of the present invention under certain observation conditions. Fig. 25 is a cross-sectional view showing a first step in the printing method used in the examples. Fig. 26 is a cross-sectional view showing a second step in the printing method used in the examples. Fig. 27 is a cross-sectional view showing a third step in the printing method used in the examples.

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are more specific embodiments of any of the above aspects. The following items can be incorporated into each of the above aspects, either singly or in combination.

[0030] Furthermore, the embodiments shown below are merely examples of configurations for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention is not limited by the materials, shapes, structures, etc. of the components described below. Various modifications can be made to the technical idea of ​​the present invention within the technical scope defined by the claims.

[0031] In the drawings, elements having the same or similar functions are denoted by the same reference numerals, and redundant explanations will be omitted. Furthermore, the drawings are schematic, and the relationship between dimensions in one direction and dimensions in another direction, and the relationship between the dimensions of one member and the dimensions of another member, etc. may differ from the actual relationship.

[0032] <First embodiment> Fig. 1 is a top view of a display according to a first embodiment of the present invention, Fig. 2 is a cross-sectional view of the display shown in Fig. 1 taken along line II-II.

[0033] In each figure, the X direction is a direction parallel to a first main surface of a transparent material layer (described later), i.e., a direction parallel to the display surface of the display body. The Y direction is a direction parallel to the first main surface and perpendicular to the X direction, i.e., a direction parallel to the display surface and perpendicular to the X direction. The Z direction is a direction perpendicular to the X and Y directions, i.e., a thickness direction of the display body.

[0034] The display 1A shown in FIGS. 1 and 2 includes a transparent material layer 2, a mask layer 3, and an image display layer.

[0035] The transparent material layer 2 is a layer made of a material that is transparent to light in the visible range, and is preferably colorless and transparent.

[0036] The transparent material layer 2 is a substrate that supports the mask layer 3 and the image display layer. The transparent material layer 2 can be a soft substrate such as a sheet or film, or a hard substrate such as a card. The transparent material layer 2 may have a single-layer structure or a multi-layer structure.

[0037] The transparent material layer 2 may be made of an inorganic material such as glass, or an organic material such as a polymer. Examples of organic materials such as polymers include photocurable resins such as polycarbonate resin, acrylic resin, fluorine-based acrylic resin, silicone-based acrylic resin, epoxy acrylate resin, polystyrene resin, cycloolefin polymer, methylstyrene resin, fluorene resin, polyethylene terephthalate (PET), and polypropylene; thermosetting resins such as acrylonitrile-styrene copolymer resin, phenolic resin, melamine resin, urea resin, and alkyd resin; and thermoplastic resins such as polypropylene resin, polyethylene terephthalate resin, and polyacetal resin.

[0038] The thickness T of the transparent material layer 2 is preferably 30 μm or more, and more preferably 50 μm or more. If the thickness T of the transparent material layer 2 is reduced, the strength of the display member 1A decreases. Furthermore, if the thickness T of the transparent material layer 2 is reduced, the amount of change in the viewing direction required to produce a large color change in the image displayed by the display member 1A increases.

[0039] The thickness T of the transparent material layer 2 is preferably 200 μm or less, more preferably 150 μm or less, and even more preferably 100 μm or less. If the thickness T of the transparent material layer 2 is large, even a slight change in the viewing direction may cause a large color change in the image displayed by the display body 1A.

[0040] 2, the transparent material layer 2 has a first main surface S1 and a second main surface S2 that is the rear surface of the first main surface S1. Here, the first main surface S1 and the second main surface S2 are planes parallel to each other.

[0041] The mask layer 3 is provided on the first main surface S1. The mask layer 3 is made up of a plurality of mask portions 31 each extending in the Y direction and arranged in the X direction. The mask portions 31 have the same width and are spaced apart from one another at a constant pitch P Ｔ are arranged in the X direction.

[0042] The masking portions 31 make it impossible or impede the visibility of the color of the portions of the image display layer that are concealed by them. According to one example, the masking layer 3 is light-blocking. According to another example, the masking portions 31 of the masking layer 3 are opaque. The masking portions 31 may be light-absorbing, light-scattering, or light-reflective with respect to light in the visible range. The masking portions 31 preferably have a visible light transmittance of 70% or less, and more preferably 50% or less. Here, "visible light transmittance" refers to the average transmittance in the wavelength range of 400 to 700 nm. The visible light transmittance can be obtained by measuring the transmittance using an LVmicro-Z manufactured by LambdaVision.

[0043] The mask portion 31 is, for example, colorless. That is, the mask layer 3 is, for example, a colorless layer. The colorless mask layer 3 is, for example, a light-shielding layer selected from a black layer, a white layer, and a metal layer.

[0044] The mask portion 31 may be colored. That is, the mask layer 3 may be a colored layer. The color of the colored mask portion 31 or mask layer 3 is arbitrary, but is preferably a color that can be produced by mixing a first color displayed by the first layer 4B and a second color displayed by the second layer 4R.

[0045] Here, as an example, the mask portion 31 is black, that is, the mask layer 3 is black.

[0046] The height of the mask portion 31, i.e., the thickness of the mask layer 3, is, for example, in the range of 0.1 to 10 μm. Preferably, the thickness of the mask layer 3 is 0.2 μm or more. If the height of the mask portion 31 is reduced, the hiding power of the mask layer 3 may be reduced. It is difficult to form a mask portion 31 with a large height with a small width W.

[0047] The mask layer 3 has a plurality of regularly arranged light transmitting portions 32. The light transmitting portions 32 have a higher transmittance in the visible range than the mask portions 31.

[0048] Here, the light-transmitting portion 32 is an opening provided in the mask layer 3. The light-transmitting portion 32 may be a transparent portion made of a transparent material that fills the opening provided in the mask layer 3. The transparent portion is preferably colorless and transparent.

[0049] Here, the light transmitting portions 32 are each strip-shaped and are regularly arranged in the width direction. Specifically, the light transmitting portions 32 each extend in the Y direction and are arranged in the X direction. The light transmitting portions 32 have a width W Ｔ are equal to each other and have a constant pitch P Ｔ In other words, the light transmitting portions 32 are arranged in a stripe pattern.

[0050] Width W of the light transmitting portion 32 Ｔ is preferably 20 μm or more, and more preferably 25 μm or more. Ｔ When the value of θ is reduced, the influence of the image display layer on the color of the image displayed by the display 1A is reduced.

[0051] Width W of the light transmitting portion 32 Ｔ The width W is preferably 100 μm or less. Ｔ When the value of θ is increased, the amount of change in the color of the image displayed by the display 1A in response to a change in the viewing direction decreases.

[0052] The pitch P of the arrangement of the light transmitting portions 32 Ｔ is preferably 50 μm or more, and more preferably 80 μm or more. Ｔ When the width of the first portion 41B and the second portion 41R is reduced, it is also necessary to reduce the width of the first portion 41B and the second portion 41R, which will be described later.

[0053] Pitch P Ｔ The pitch P is preferably 250 μm or less. Ｔ When the width of the mask portions 31 is large, the mask portions 31 can be distinguished by visual observation, particularly when the width of the mask portions 31 is large.

[0054] The portion of the mask layer 3 where the light-transmitting portion 32 is provided preferably has an aperture ratio in the range of 10% to 90%. According to one example, the aperture ratio is preferably in the range of 40% to 70%, more preferably in the range of 50% to 60%. According to another example, the aperture ratio is preferably in the range of 70% to 90%, more preferably in the range of 80% to 85%. Increasing the aperture ratio can, for example, increase the saturation and brightness of the image displayed by the display body 1A. Furthermore, increasing the aperture ratio can improve the adhesion between the front substrate and the display body 1A when, for example, the display body 1A is sandwiched between a pair of substrates and integrated. It also makes it easier to view the image recorded on the rear substrate in the region of the mask layer 3 corresponding to the portion where the light-transmitting portion 32 is provided. However, increasing the aperture ratio may reduce color changes in the image displayed by the display body 1A due to changes in the viewing direction. Here, the aperture ratio is determined based on the width W Ｔ and Pitch P Ｔ Ratio to W Ｔ / P Ｔ is.

[0055] The image display layer is provided on the second main surface S2 and includes a first layer 4B and a second layer 4R.

[0056] The first layer 4B displays a first color. In this example, the first layer 4B displays blue.

[0057] The first layer 4B includes a plurality of first portions 41B. Each of these first portions 41B includes one or more first regions that are observable through one of the light transmitting portions 32 when observed from a normal direction perpendicular to the first main surface S1 (hereinafter referred to as the first direction), and one or more second regions that are not observable through any of the light transmitting portions 32 when observed from the first direction.

[0058] Here, the first portions 41B each extend in the Y direction and are arranged in the X direction. The first portions 41B have a first region that faces the light-transmitting portion 32 with the transparent material layer 2 sandwiched therebetween, and a second region that faces the mask portion 31 with the transparent material layer 2 sandwiched therebetween. These first and second regions each have a shape that extends in the length direction of the light-transmitting portion 32 and are arranged in the width direction of the light-transmitting portion 32.

[0059] The second layer 4R displays a second color different from the first color. Here, as an example, the second layer 4R displays red.

[0060] The second layer 4R includes a plurality of second portions 41R. Each of these second portions 41R includes one or more first regions that are observable through one of the light transmitting portions 32 when observed from the first direction, and one or more second regions that are not observable through any of the light transmitting portions 32 when observed from the first direction.

[0061] Here, the second portions 41R each extend in the Y direction and are arranged in the X direction. The second portions 41R have a first region that faces the light-transmitting portion 32 with the transparent material layer 2 sandwiched therebetween, and a second region that faces the mask portion 31 with the transparent material layer 2 sandwiched therebetween. These first and second regions each have a shape that extends in the length direction of the light-transmitting portion 32 and are arranged in the width direction of the light-transmitting portion 32.

[0062] The first portions 41B and the second portions 41R are alternately arranged in the arrangement direction (first arrangement direction) of the light transmitting portions 32. The arrangement pitch of the first portions 41B and the arrangement pitch of the second portions 41R are equal to the arrangement pitch P Ｔ The first portion 41B and the second portion 41R are arranged such that the position of the boundary region therebetween coincides with the position of the center line of the mask portion 31 and the position of the center line of the light transmitting portion 32.

[0063] The array of the first portions 41B and the array of the second portions 41R have the same shape and are positioned at the same location. Here, each of these arrays is rectangular.

[0064] The first portion 41B and the second portion 41R are spaced apart from each other. If the first portion 41B and the second portion 41R partially overlap at the light-transmitting portion 32 due to variations in their shapes or dimensions, the areas of the first portion 41B and the second portion 41R that can be viewed through the light-transmitting portion 32 deviate from the design values. This deviation results in a degradation of image quality. By adopting a structure in which the first portion 41B and the second portion 41R are spaced apart from each other, it is possible to reduce the degradation of image quality caused by the overlap. Furthermore, this configuration facilitates the entry of light from the outside into the second main surface S2, allowing the display body 1A to display a brighter image. To achieve these effects, the distance between the first portion 41B and the adjacent second portion 41R is preferably 3 μm or more, and more preferably 5 μm or more.

[0065] However, increasing these distances reduces the area of ​​the first portion 41B and the second portion 41R that can be viewed through the light-transmitting portion 32. As a result, the saturation of the image displayed by the display body 1A decreases. From this perspective, these distances are preferably 15 μm or less, and more preferably 10 μm or less.

[0066] The first portion 41B and the adjacent second portion 41R may be in contact with each other. If the first portion 41B and the second portion 41R can be formed with high shape and dimensional precision, adopting this configuration can achieve the highest image quality.

[0067] Width W of the first portion 41B Ｂ and the width W of the second portion 41R Ｒ Each of these has a pitch P Ｔ It is preferable that the pitch is 50% or less of the pitch P Ｔ It is more preferable that the width W is 45% or less. Ｂ and width W Ｒ Each of these has a pitch P Ｔ It is preferable that the pitch is 30% or more of the pitch P Ｔ If this ratio is increased, for example, the display 1A can display a highly saturated image over a wider range of viewing angles.

[0068] The ratio S1 / S2 of the total area S1 of the first regions for all of the first portion 41B and the second portion 41R to the total area S2 of the light-transmitting portions 32 is preferably in the range of 10% to 100%. According to one example, the ratio S1 / S2 is preferably in the range of 70% to 100%, more preferably in the range of 85% to 100%. According to another example, the ratio S1 / S2 is preferably in the range of 10% to 60%, more preferably in the range of 15% to 40%. Increasing the ratio S1 / S2 can increase the saturation of the image displayed by the display body 1A when viewed from the first direction, for example. On the other hand, decreasing the ratio S1 / S2 can improve the adhesion between the rear-side substrate and the display body 1A when, for example, the display body 1A is sandwiched between a pair of substrates and integrated. This also makes it easier to view the image recorded on the rear-side substrate in the region of the mask layer 3 corresponding to the light-transmitting portions 32. Here, the ratio S1 / S2 is the width W Ｔ The width W of the first region included in the first portion 41B Ｂ 1 and the width W of the first region included in the second portion 41R Ｒ Sum of 1 and W Ｂ 1+W Ｒ 1 ratio (W Ｂ 1+W Ｒ 1) / W Ｔ is.

[0069] The width W of the second region of the first portion 41B Ｂ The ratio W of the thickness T of the transparent material layer 2 to the thickness W of the transparent material layer 2 Ｂ The ratio 2 / T is preferably in the range of 0.3 to 1.4, and more preferably in the range of 0.8 to 1.0. Ｒ The ratio W of the thickness T of the transparent material layer 2 to the thickness W of the transparent material layer 2 Ｒ 2 / T, and the ratio W Ｂ It is preferable that the ratio W is within the range described above for 2 / T. Ｂ 2 / T or ratio W Ｒ When the ratio W / T is increased, the amount of change in the color of the image displayed by the display 1A in response to a change in the viewing direction decreases. Ｂ 2 / T or ratio W Ｒ If 2 / T is reduced, the range of observation angles in which the display 1A can display an image with high saturation becomes narrower.

[0070] The thickness of each layer included in the image display layer is, for example, in the range of 0.1 to 10 μm, and preferably, the thickness of these layers is 0.2 μm or more.

[0071] The mask portion 31, the first portion 41B, and the second portion 41R can be formed by, for example, printing, which can be performed using, for example, screen printing, screen offset printing, gravure printing, gravure offset printing, or flexographic printing.

[0072] For example, general-purpose color ink can be used for this printing. The ink used for this printing contains, for example, a resin and a pigment.

[0073] Examples of resins that can be used for the ink include general-purpose resins such as vinyl chloride resins, acrylic resins, polyurethane resins, polyester resins, epoxy resins, nitrocellulose resins, ethyl cellulose resins, polyamide resins, phenol resins, ketone resins, maleic acid resins, and photocurable resins.

[0074] Ink pigments include metals, oxides such as titanium dioxide, zinc oxide, and iron black, hydroxides, sulfides, selenides, cobalt aluminate, ferrocyanides, chromates, sulfates, carbonates, silicates, phosphates, and carbon. Organic pigments include carbon compounds, nitroso compounds, nitro compounds, azo compounds, lake pigments, phthalocyanine compounds, and condensed polycyclic materials.

[0075] Light-scattering particles may be used as the pigment of the ink. Examples of the material of the light-scattering particles include acrylic resin, polystyrene, styrene-acrylic copolymer or its crosslinked product, melamine-formaldehyde condensate, urethane resin, polyester, silicone resin, fluororesin, epoxy resin, and copolymers thereof. Inorganic substances may also be used for the light-scattering particles. Examples of inorganic substances that can be used for the light-scattering particles include clay compounds such as smectite, kaolinite, and talc; inorganic oxides such as silica, titania, alumina, silica-alumina, zirconia, zinc oxide, barium oxide, and strontium oxide; inorganic carbonates such as calcium carbonate, barium carbonate, magnesium carbonate, and strontium carbonate; inorganic chlorides such as barium chloride and strontium chloride; inorganic sulfates such as barium sulfate and strontium sulfate; inorganic nitrates such as barium nitrate and strontium nitrate; inorganic hydroxides such as barium hydroxide, aluminum hydroxide, and strontium hydroxide; and glass.

[0076] The ink may further contain a solvent, such as a hydrocarbon solvent such as petroleum naphtha, toluene, xylene, tetralin, or turpentine oil; an ester solvent such as n-butyl acetate or methoxybutyl acetate; a ketone solvent such as MIBK, diacetone alcohol, cyclohexanone, or isophorone; a polyhydric alcohol derivative such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, cellosolve acetate, butyl cellosolve acetate, or butyl carbitol; or a mixture thereof.

[0077] The ink may further comprise additives such as vegetable oils, surfactants, wax swells, defoamers, leveling agents, slip agents, UV absorbers, plasticizers, curing accelerators, or mixtures thereof.

[0078] The display body 1A can further include one or more protective layers. For example, the display body 1A can further include a protective layer provided on the first main surface S1 with the mask layer 3 sandwiched therebetween. Alternatively, the display body 1A can further include a protective layer provided on the second main surface S2 with the image display layer sandwiched therebetween. Alternatively, the display body 1A can further include both of these protective layers.

[0079] The protective layer is transparent to light in the visible range. The protective layer is preferably colorless and transparent. The protective layer may be a sheet or a film. For example, the protective layer may be a polymer sheet or a polymer film. The protective layer may have a single-layer structure or a multi-layer structure.

[0080] Examples of materials for the protective layer include photocurable resins such as polycarbonate resin, acrylic resin, fluorine-based acrylic resin, silicone-based acrylic resin, epoxy acrylate resin, polystyrene resin, cycloolefin polymer, methylstyrene resin, fluorene resin, polyethylene terephthalate (PET), and polypropylene; thermosetting resins such as acrylonitrile-styrene copolymer resin, phenolic resin, melamine resin, urea resin, and alkyd resin; and thermoplastic resins such as polypropylene resin, polyethylene terephthalate resin, and polyacetal resin.

[0081] The color of the image displayed by the display 1A can change depending on the viewing direction, as will be described below. Here, the surface of the display 1A facing the image display layer is illuminated with white light, and the surface of the display 1A facing the mask layer 3 is observed.

[0082] Fig. 3 is a diagram schematically illustrating a state in which an observer observes an image displayed by the display device shown in Fig. 1 and Fig. 2 under certain observation conditions. Fig. 4 is an enlarged diagram illustrating an image displayed by the display device shown in Fig. 1 and Fig. 2 under the observation conditions of Fig. 3.

[0083] Under the observation conditions shown in Fig. 3, the observation direction D, in which the observer OB observes the display body 1A, is the first direction, i.e., the Z direction. Under these observation conditions, as shown in Fig. 4, a portion of each of the first portion 41B and the second portion 41R is hidden by the mask portion 31, and the remaining portion is visible through the light-transmitting portion 32. Therefore, the color of the image displayed by the display body 1A at the position where the array of the mask portions 31 and the image display layer overlap is a mixture of the color of the mask portion 31, the color of the first portion 41B, and the color of the second portion 41R. In this case, the mask portion 31 is black, the first portion 41B is blue, and the second portion 41R is red, so the color of the image is dark purple.

[0084] Fig. 5 is a diagram schematically illustrating a state in which an observer observes an image displayed by the display device shown in Fig. 1 and Fig. 2 under another observation condition. Fig. 6 is an enlarged diagram illustrating an image displayed by the display device shown in Fig. 1 and Fig. 2 under the observation condition of Fig. 5.

[0085] Under the observation conditions shown in FIG. 5 , the observation direction D is perpendicular to the Y direction and tilted toward the positive side with respect to the Z direction. The angle that the observation direction D forms with respect to the Z direction is smaller than the angle that a second direction (described later) forms with respect to the Z direction. Under these observation conditions, as shown in FIG. 6 , the area of ​​the first portion 41B that is hidden by the mask portion 31 is smaller, and the area that is visible through the light-transmitting portion 32 is larger, compared to the observation conditions described with reference to FIGS. 3 and 4 . Also, under these observation conditions, the area of ​​the second portion 41R that is hidden by the mask portion 31 is larger, and the area that is visible through the light-transmitting portion 32 is smaller, compared to the observation conditions described with reference to FIGS. 3 and 4 . Therefore, under these observation conditions, the first portion 41B has a greater effect, and the second portion 41R has a smaller effect, on the color of the image displayed by the display body 1A at the position where the array of the mask portions 31 and the image display layer overlap, compared to the observation conditions described with reference to FIGS. 3 and 4 . In this case, the mask portion 31 is black, the first portion 41B is blue, and the second portion 41R is red, so the color of the image is dark purple with a strong bluish tinge and a weak reddish tinge.

[0086] Fig. 7 is a diagram schematically illustrating a state in which an observer observes an image displayed by the display device shown in Fig. 1 and Fig. 2 under still another observation condition. Fig. 8 is a diagram illustrating an enlarged view of an image displayed by the display device shown in Fig. 1 and Fig. 2 under the observation condition of Fig. 7.

[0087] Under the observation conditions shown in FIG. 7 , the observation direction D is the second direction. The second direction is perpendicular to the Y direction and tilted toward the positive side with respect to the Z direction. The angle between the observation direction D or the second direction and the Z direction is larger than the angle between the observation direction D and the Z direction under the observation conditions described with reference to FIG. 5 . Under these observation conditions, as shown in FIG. 8 , the second portion 41R is hidden by the mask portion 31, and only the first portion 41B is visible at the position of the light-transmitting portion 32. Therefore, the color of the image displayed by the display body 1A at the position where the array of the mask portions 31 and the image display layer overlap is a mixture of the color of the mask portion 31 and the color of the first portion 41B. Here, the mask portion 31 is black and the first portion 41B is blue, so the color of the image is dark blue.

[0088] Fig. 9 is a diagram schematically illustrating a state in which an observer observes an image displayed by the display device shown in Fig. 1 and Fig. 2 under still another observation condition. Fig. 10 is a diagram showing an enlarged view of an image displayed by the display device shown in Fig. 1 and Fig. 2 under the observation condition of Fig. 9.

[0089] Under the observation conditions shown in FIG. 9 , the observation direction D is perpendicular to the Y direction and inclined toward the negative side with respect to the Z direction. The angle that the observation direction D forms with respect to the Z direction is smaller than the angle that a third direction (described later) forms with respect to the Z direction. Under these observation conditions, the area of ​​the first portion 41B that is hidden by the mask portion 31 is larger, and the area that is visible through the light-transmitting portion 32 is smaller. Also, under these observation conditions, compared to the observation conditions described with reference to FIGS. 3 and 4 , the area of ​​the second portion 41R that is hidden by the mask portion 31 is smaller, and the area that is visible through the light-transmitting portion 32 is larger. Therefore, under these observation conditions, compared to the observation conditions described with reference to FIGS. 3 and 4 , the first portion 41B has a smaller effect, and the second portion 41R has a greater effect, on the color of the image displayed by the display body 1A at the position where the array of the mask portions 31 and the image display layer overlap. In this case, the mask portion 31 is black, the first portion 41B is blue, and the second portion 41R is red, so the color of the image is dark purple with a weak blue tint and a strong red tint.

[0090] Fig. 11 is a diagram schematically illustrating a state in which an observer observes an image displayed by the display device shown in Fig. 1 and Fig. 2 under still another observation condition. Fig. 12 is a diagram illustrating an enlarged view of an image displayed by the display device shown in Fig. 1 and Fig. 2 under the observation condition of Fig. 11.

[0091] Under the observation conditions shown in FIG. 11 , the observation direction D is the third direction. The third direction is perpendicular to the Y direction and tilted negatively with respect to the Z direction. The angle between the observation direction D or the third direction and the Z direction is larger than the angle between the observation direction D and the Z direction under the observation conditions described with reference to FIG. 9 . Under these observation conditions, as shown in FIG. 12 , the first portion 41B is hidden by the mask portion 31, and only the second portion 41R is visible at the position of the light-transmitting portion 32. Therefore, the color of the image displayed by the display body 1A at the position where the array of the mask portions 31 and the image display layer overlap is a mixture of the color of the mask portion 31 and the color of the second portion 41R. Here, the mask portion 31 is black and the second portion 41R is red, so the color of the image is dark red.

[0092] As described above, the display body 1A can change the color of the image in response to changes in the viewing direction, even if the mask layer 3 and the layers contained in the image display layer do not use optically variable ink. Therefore, there are no restrictions on the pigments that can be used, and it is possible to produce color changes that cannot be achieved with optically variable ink, for example. In this way, the technology described above for the display body 1A makes it possible to display special images.

[0093] Furthermore, when the observer OB attempts to check the color change of the image displayed by the display unit 1A, he or she typically first sets the observation direction D to a substantially normal direction and then tilts the observation direction D. A display unit having a structure similar to that of the display unit 1A except that the first portion 41B and the second portion 41R are arranged so that the center line of the first portion 41B coincides with the center line of the light-transmitting portion 32 has a gap region between the first portion 41B and the second portion 41R. Therefore, simply changing the observation direction D from a substantially normal direction to a slightly tilted direction does not change the color of the image. Therefore, with such a display unit, the color change of the displayed image in response to changes in the observation direction is discontinuous.

[0094] In contrast to this, the color of the image displayed by the display 1A changes simply by tilting the viewing direction D slightly from the normal direction. The color of this image changes continuously in response to changes in the viewing direction D.

[0095] Second Embodiment Fig. 13 is an enlarged view showing an image displayed by a display according to a second embodiment of the present invention under certain viewing conditions, and Fig. 14 is a view showing a structure obtained by omitting the mask layer from the display shown in Fig. 13.

[0096] The display 1B shown in FIG. 13 is similar to the display 1A described above, except that the mask layer 3 and the image display layer have the following structures.

[0097] That is, in the display body 1B, the portions of the mask layer 3 where the light-transmitting portions are provided, i.e., the mask portions 31 here, are lattice-shaped rather than stripe-shaped. The light-transmitting portions of the mask layer 3 are square-shaped or rectangular-shaped. The light-transmitting portions of the mask layer 3 are arranged in the X direction and the Y direction.

[0098] In addition, in the display body 1B, the image display layer has the structure shown in Fig. 14. That is, the first portions 41B each have a shape extending in the X direction and are arranged in the Y direction. One side of each of the first portions 41B along its length is wavy. Here, the first portions 41B each have a shape in which first cross portions and first connecting portions are alternately connected in the X direction and are arranged in the Y direction.

[0099] Each of the second portions 41R has a shape that extends in the X direction and is alternately arranged with the first portions 41B in the Y direction. One side of each of the second portions 41R along its length is wavy. Here, each of the second portions 41R has a shape in which second cross portions and second connecting portions are alternately connected in the X direction, and the second portions 41R are arranged with the first portions 41B in the Y direction so that the second connecting portions are located between adjacent first cross portions in the Y direction.

[0100] In the image display layer, the first portion 41B and the second portion 41R have a gap region between the first cross portion and the second cross portion that are adjacent to each other in a direction tilted with respect to the X direction. The first portion 41B and the second portion 41R are arranged such that a portion of the gap region coincides with the center of the light transmitting portion, and the remaining portion of the gap region overlaps with the position of the mask portion 31.

[0101] As described above, the image displayed by the display unit 1A at the position where the array of mask portions 31 and the image display layer overlap changes color when the observation direction is changed in a plane perpendicular to the Y direction. However, the image displayed by the display unit 1A does not change color even when the observation direction is changed in a plane perpendicular to the X direction.

[0102] In contrast, the image displayed by the display 1B at the position where the array of mask portions 31 and the image display layer overlap each other undergoes color change regardless of the viewing direction. In this way, the technology described above for the display 1B enables even more unique image displays.

[0103] Furthermore, similar to the display 1A, the color of the image displayed by the display 1B changes simply by tilting the viewing direction D slightly from the normal direction. The color of this image changes continuously in response to changes in the viewing direction D.

[0104] <Third embodiment> Fig. 15 is an enlarged view showing an image displayed by a display according to a third embodiment of the present invention under certain viewing conditions, and Fig. 16 is a view showing a structure obtained by omitting the mask layer from the display shown in Fig. 15.

[0105] A display 1C shown in FIG. 15 is similar to the display 1A described above, except that the mask layer 3 and the image display layer have the following structures.

[0106] That is, in the display body 1C, the portions of the mask layer 3 where the light-transmitting portions are provided, i.e., the mask portions 31 here, are not striped but have a checkered pattern. The light-transmitting portions of the mask layer 3 are square or rectangular.

[0107] In addition, in the display body 1C, the image display layer has the structure shown in Fig. 16. That is, the first portions 41B and the second portions 41R are each square or rectangular and are arranged alternately in the X and Y directions. The arrangement pitch of the first portions 41B in the X and Y directions is the same as the arrangement pitch of the mask portions 31 in the X and Y directions, respectively. Between the first portions 41B and the second portions 41R, there are interposed boundary regions extending in the X direction and boundary regions extending in the Y direction. The intersection of these boundary regions faces the center of the mask portion 31 of the mask layer 3 or the center of the light-transmitting portion.

[0108] The image displayed by display 1A changes color when the viewing direction is tilted in a plane perpendicular to the Y direction. In contrast, the image displayed by display 1C changes color when the viewing direction is tilted in a plane perpendicular to the Z direction and a direction obliquely intersecting the Y direction, for example, a plane perpendicular to directions that form angles of 90° with the Z direction and 45° with the Y direction.

[0109] Furthermore, display body 1A displays an image of a different color when the observation direction is tilted to the positive side within a plane perpendicular to the Y direction and when the observation direction is tilted to the negative side within this plane. In contrast, display body 1C displays an image of the same color when the observation direction is tilted to the positive side within a plane perpendicular to the Z direction and a direction obliquely intersecting the Y direction and when the observation direction is tilted to the negative side within this plane. Display body 1C also displays an image of a different color when the observation direction is tilted to the positive side within a plane perpendicular to the Z direction and a direction perpendicular to the Y direction and a direction obliquely intersecting the Z direction and the Y direction and when the observation direction is tilted to the negative side within this plane.

[0110] In this way, the technology described above for display body 1C enables even more unique image display. Furthermore, similar to display body 1A, the color of the image displayed by display body 1C changes simply by tilting the viewing direction D slightly from the normal direction. Furthermore, the color of this image changes continuously in response to changes in viewing direction D.

[0111] <Fourth embodiment> Fig. 17 is an enlarged view showing an image displayed by a display according to a fourth embodiment of the present invention under certain viewing conditions, and Fig. 18 is a view showing a structure obtained by omitting the mask layer from the display shown in Fig. 17.

[0112] A display 1D shown in FIG. 17 is similar to the display 1A described above, except that the mask layer 3 and the image display layer have the following structures.

[0113] That is, in the display body 1D, the light-transmitting portions of the mask layer 3 are each strip-shaped and are arranged regularly and nested in the width direction. More specifically, the portion of the mask layer 3 where the light-transmitting portions are provided, here the mask portion 31, is not strip-shaped but concentric.

[0114] In addition, in the display body 1D, the image display layer has the structure shown in Fig. 18. That is, the first portions 41B are each strip-shaped and are arranged regularly and nested in the width direction. More specifically, the first portions 41B are concentric. In each of the first portions 41B, the region along the outer periphery faces the light-transmitting portion of the mask layer 3, and the region along the inner periphery faces the mask portion 31 of the mask layer 3.

[0115] The second portions 41R are each strip-shaped and are arranged regularly and nested in the width direction. More specifically, the second portions 41R are concentric. The inner periphery of each second portion 41R faces the light-transmitting portion of the mask layer 3, and the outer periphery faces the mask portion 31 of the mask layer 3.

[0116] The center of the arrangement of the second portions 41R coincides with the center of the arrangement of the first portions 41B. The first portions 41B and the second portions 41R are arranged concentrically. The first portions 41B and the second portions 41R are arranged alternately from the center of the circle outward. The first portions 41B and the second portions 41R are spaced apart from each other.

[0117] When the display body 1D is observed from a first direction, which is the normal direction, each of the first portion 41B and the second portion 41R is partially hidden by the mask portion 31, and the remaining portions of the first portion 41B and the second portion 41R are visible through the light-transmitting portion. Therefore, the color of the image displayed by the display body 1D at the position where the array of the mask portions 31 and the image display layer overlap is a mixture of the color of the mask portion 31, the color of the first portion 41B, and the color of the second portion 41R. In this case, the mask portion 31 is black, the first portion 41B is blue, and the second portion 41R is red, so the color of the image is dark purple.

[0118] When the observation direction is tilted relative to the first direction, for example, when the observation direction is tilted toward the positive side in a plane perpendicular to the Y direction, for example, when the observation direction is set to a second direction tilted to the right in the figure relative to the normal direction, in the region located to the right of the center of the circle in the figure, the first portion 41B is hidden by the mask portion 31, and only the second portion 41R is visible through the light-transmitting portion. Therefore, the color of the image displayed by the display unit 1D in this region is a mixture of the color of the mask portion 31 and the color of the second portion 41R. In this case, the mask portion 31 is black and the second portion 41R is red, so the color of the image is dark red.

[0119] When the display unit 1D is observed from the second direction, in the region located to the left of the center of the circle in the figure, the second portion 41R is hidden by the mask portion 31, and only the first portion 41B is visible through the light-transmitting portion. Therefore, the color of the image displayed by the display unit 1D in this region is a mixture of the color of the mask portion 31 and the color of the first portion 41B. In this case, the mask portion 31 is black and the first portion 41B is blue, so the color of the image is dark blue.

[0120] When the display unit 1D is viewed from the second direction, the color of the image displayed by the display unit 1D in the area above or below the center of the circle in the figure is the same as the color of the image displayed by the display unit 1D when viewed from the first direction, i.e., the color of the image is dark purple.

[0121] As described above, when the image displayed by the display unit 1D at the position where the mask array and the image display layer overlap is viewed from the first direction, the image is the same color throughout. In contrast, when the viewing direction is changed to the second direction, the image displayed by the display unit 1D includes areas of different colors. In this way, the technology described above for the display unit 1D also enables special image display.

[0122] Furthermore, similar to the display 1A, the color of the image displayed by the display 1D changes simply by tilting the viewing direction D slightly from the normal direction. The color of this image changes continuously in response to changes in the viewing direction D.

[0123] Fifth Embodiment FIG. 19 is a cross-sectional view of a display according to a fifth embodiment of the present invention.

[0124] A display 1E shown in FIG. 19 is similar to the display 1A described above, except that the mask layer 3 is a laminate including a light-shielding layer 31A and a colored layer 31B.

[0125] The light-shielding layer 31A is selected from, for example, a black layer, a white layer, and a metal layer. Preferably, the light-shielding layer 31A is a white layer or a metal layer. In this case, the display body 1E displays a brighter image than when the light-shielding layer 31A is a black layer.

[0126] The colored layer 31B faces the first main surface S1 with the light-shielding layer 31A sandwiched therebetween. The color of the colored layer 31B is arbitrary. In one example, the color displayed by the colored layer 31B can be generated by mixing the first color displayed by the first layer 4B with the second color displayed by the second layer 4R. In another example, the color displayed by the colored layer 31B cannot be generated by mixing the first color displayed by the first layer 4B with the second color displayed by the second layer 4R.

[0127] Like display body 1A, display body 1E can change the color of an image in response to a change in the viewing direction, even if it does not use optically variable ink in the mask layer 3 or the layers contained in the image display layer. Also, like display body 1A, the color of the displayed image in display body 1E changes simply by tilting the viewing direction D slightly from the normal direction, and the color of this image changes continuously in response to a change in the viewing direction D. Furthermore, because display body 1E has a mask layer 3 including a light-shielding layer 31A and a colored layer 31B, it can display, for example, a brighter image or an image with higher saturation than display body 1A.

[0128] Sixth Embodiment FIG. 20 is a cross-sectional view of a display according to a sixth embodiment of the present invention.

[0129] A display 1F shown in FIG. 20 is similar to the display 1A described above, except that it further includes a back surface layer 5.

[0130] The back surface layer 5 faces the second main surface S2 with the image display layer sandwiched therebetween. Here, the back surface layer 5 is provided on the image display layer. Specifically, the back surface layer 5 includes a plurality of back surface portions 51 each extending in the Y direction and arranged in the X direction. These back surface portions 51 are provided on the first portion 41B and the second portion 41R of the image display layer.

[0131] The back surface layer 5 is, for example, a reflective layer. The reflective layer is, for example, a metal material layer. The reflective layer can also be formed from ink containing a light-reflecting or light-scattering pigment. Such a reflective layer contains a light-reflecting or light-scattering pigment and a resin.

[0132] The ink for forming the back surface layer 5 can be the same as that described above for the ink for forming the mask portion 31, the first portion 41B and the second portion 41R, except that the pigment is a light-reflecting or light-scattering pigment.

[0133] Light-reflecting or light-scattering pigments are typically made of inorganic materials. Examples of inorganic materials that can be used for light-reflecting pigments include metals or alloys such as aluminum, chromium, gold, silver, nickel, and copper. Examples of inorganic materials that can be used for light-scattering pigments include calcium carbonate, barium sulfate, aluminum hydroxide, zinc oxide, lithopone, and titanium oxide. Examples of inorganic materials that can be used for light-scattering pigments include clay compounds such as smectite, kaolinite, and talc; inorganic oxides such as silica, titania, alumina, silica-alumina, zirconia, zinc oxide, barium oxide, and strontium oxide; inorganic carbonates such as calcium carbonate, barium carbonate, magnesium carbonate, and strontium carbonate; inorganic chlorides such as barium chloride and strontium chloride; inorganic sulfates such as barium sulfate and strontium sulfate; inorganic nitrates such as barium nitrate and strontium nitrate; inorganic hydroxides such as barium hydroxide, aluminum hydroxide, and strontium hydroxide; and glass.

[0134] The display body 1F preferably satisfies the relationships shown in the following formulas (1) to (5): Raf1≧20% (1) Raf2≧20% (2) Rab≧30% (3) (Rpf1−Raf1)−(Rpb−Rab)≧10% (4) (Rpf2−Raf2)−(Rpb−Rab)≧10% (5) Here, “Rpf1” is the maximum value of the reflectance measured for the first portion 41B through the light transmitting portion 32 in the wavelength range of 400 to 700 nm. “Raf1” is the average value of the reflectance measured for the first portion 41B through the light transmitting portion 32 in the wavelength range of 400 to 700 nm. “Rpf2” is the maximum value of the reflectance measured for the second portion 41R through the light transmitting portion 32 in the wavelength range of 400 to 700 nm. "Raf2" is the average value of the reflectance measured for the second portion 41R through the light transmitting portion 32 within a wavelength range of 400 to 700 nm. "Rpb" is the maximum value of the reflectance measured for the surface of the back surface layer 5 opposite to the surface facing the second main surface S2 within a wavelength range of 400 to 700 nm. "Rab" is the average value of the reflectance measured for the surface of the back surface layer 5 opposite to the surface facing the second main surface S2 within a wavelength range of 400 to 700 nm.

[0135] These reflectances are measured using a microspectroscopic reflectance measuring device that can measure reflectance by irradiating a minute area with measuring light.

[0136] Specifically, when measuring the reflectance of the first portion 41B in the wavelength range of 400 to 700 nm through the light-transmitting portion 32, the focus is adjusted to a first region of the first portion 41B that overlaps with the light-transmitting portion 32, and the diameter of the region irradiated with the measurement light is set smaller than the width of the first region. Measurements are performed at five arbitrary locations, and the measurement results that yielded the highest and lowest average reflectances are excluded, and the remaining three measurement results are arithmetically averaged. From the results obtained by this arithmetic average, the maximum reflectance Rpf1 and average reflectance Raf1 for the first portion 41B are obtained.

[0137] When measuring the reflectance of the second portion 41R in the wavelength range of 400 to 700 nm through the light-transmitting portion 32, the focus is adjusted to a first region of the second portion 41R that overlaps with the light-transmitting portion 32, and the diameter of the region irradiated with the measurement light is set smaller than the width of the first region. Measurements are performed at five arbitrary locations, and the measurement results that yielded the highest and lowest average reflectances are excluded, and the remaining three measurement results are arithmetically averaged. From the results obtained by this arithmetic average, the maximum reflectance Rpf2 and average reflectance Raf2 for the second portion 41R are obtained.

[0138] Furthermore, when measuring the reflectance of the back surface layer 5 within the wavelength range of 400 to 700 nm, the focus is set on the back surface portion 51, and the diameter of the area irradiated with the measurement light is set smaller than the width of the back surface portion 51. Measurements are performed at any five locations, and the measurement results that yielded the highest and lowest average reflectances are excluded, and the remaining three measurement results are arithmetically averaged. From the results obtained by this arithmetic average, the maximum reflectance Rpb and average reflectance Rab for the back surface layer 5 are obtained.

[0139] A display body 1F that satisfies the relationships of formulas (1) and (2) exhibits high reflectance at the position of the first region of the first portion 41B and the second portion 41R when illuminated with white light from the front. In a display body 1F that satisfies the relationship of formula (3), the back surface layer 5 exhibits high reflectance to white light compared to a surface with low reflectance, such as a black surface. In a display body 1F that satisfies the relationships of formulas (4) and (5), the saturation of the color exhibited at the position of the first region of the first portion 41B and the second portion 41R when illuminated with white light from the front is sufficiently greater than the saturation of the color exhibited at the position of the back surface layer 5 when illuminated with white light from the back.

[0140] As described above, the thickness of each layer included in the image display layer is, for example, 10 μm or less. When such a layer is irradiated with visible light in the wavelength range of 400 to 700 nm, the layer transmits a large amount of light while reflecting only a small amount of light.

[0141] Therefore, when the back surface of the display unit 1A is illuminated with white light and the transmitted light is observed, or when the display unit 1A is placed on a white surface so that its back surface is in contact with the white surface and the front surface of the display unit 1A is illuminated with white light and the reflected light is observed, the display unit 1A displays a bright image where the array of light-transmitting portions 32 and the image display layer overlap. Bright images are easily visible. However, when the display unit 1A is placed on a low-reflectivity surface, such as a black surface, so that its back surface is in contact with the surface and the front surface of the display unit 1A is illuminated with white light and the reflected light is observed, the image displayed by the display unit 1A is dark and therefore difficult to view.

[0142] Display body 1F includes a back surface layer 5. When the front surface of display body 1F is illuminated with white light, back surface layer 5 exhibits a higher reflectivity for light transmitted through the layers included in the image display layer compared to a low-reflectivity surface such as a black surface. Therefore, even when display body 1F is placed on a low-reflectivity surface, such as a black surface, so that its back surface is in contact with this surface, and the front surface of display body 1F is illuminated with white light and the reflected light is observed, a bright image is displayed at the position where the array of light-transmitting portions 32 and the image display layer overlap. In other words, display body 1F can display easily visible images under a wider variety of conditions.

[0143] The back surface layer 5 can also be provided on the displays 1B to 1D. Similar to the display 1F, such a display can also display an image that is easily visible under a wider variety of conditions.

[0144] Seventh Embodiment FIG. 21 is a cross-sectional view of a label according to a seventh embodiment of the present invention.

[0145] The label 10 shown in Fig. 21 includes the display body 1F and an adhesive layer 11. The adhesive layer 11 is supported by the display body 1F. The adhesive layer 11 faces the second main surface S2 with the image display layer and the back surface layer 5 sandwiched therebetween. The adhesive layer 11 is made of, for example, a thermoplastic resin or a pressure-sensitive adhesive. The label 10 may further include a release sheet removably provided on the adhesive layer 11.

[0146] When the display body 1F is to be supported on another article, a label 10 including the display body 1F may be prepared and attached to the article. The label may be formed by supporting an adhesive layer 11 on any one of the display bodies 1A to 1D or on one provided with a back surface layer 5.

[0147] Eighth Embodiment Fig. 22 is a cross-sectional view of an article with a display member according to an eighth embodiment of the present invention. The article with a display member 100A shown in Fig. 22 includes a label 10 and an article 110.

[0148] The label 10 includes a display body 1 and an adhesive layer 11. The display body 1 is any one of display bodies 1A to 1E, or a display body 1F, which is formed by providing a back layer 5 thereon. The adhesive layer 11 is supported by the display body 1 so as to face the second main surface S2 with the image display layer sandwiched therebetween, or with the image display layer and the back layer 5 sandwiched therebetween. The display body 1 is attached to the article 110 via the adhesive layer 11. Here, as an example, the display body 1 is assumed to be display body 1F.

[0149] The article 110 supports the display body 1. Here, as described above, the article 110 has a support surface, and supports the display body 1 at the position of this support surface via the adhesive layer 11. The article 110 may support the display body 1 by means other than an adhesive.

[0150] Color difference ΔE between the mask layer 3 and the support surface ＊ ａｂ is preferably small, for example, 5 or less. In this case, the presence of the mask layer 3 becomes difficult to perceive, and it becomes difficult to perceive that the display body 1 is attached to the article 110. In addition, in this case, it becomes easy to perceive changes in the image displayed by the display body 1 at the position where the arrangement of the mask portions 31 and the image display layer overlap, depending on the viewing direction.

[0151] The colors of the mask layer 3 and the support surface are measured using a micro-area spectrophotometer that can measure the color of a small measurement area by magnifying it with a microscope. Specifically, when measuring the color of the mask layer 3, the focus is set on an area of ​​the mask portion 31 that has a diameter smaller than its width, and color measurement is performed on this area. This color measurement is performed on any three locations, and the obtained results are arithmetically averaged to obtain the color of the mask layer 3. The color of the support surface is also obtained using the same method as described above for the mask layer 3. From these results, the color difference ΔE ＊ ａｂ Calculate.

[0152] 23 is a cross-sectional view of an article with a display member according to a ninth embodiment of the present invention. The article with a display member 100B shown in Fig. 23 includes a display member 1 and an article made of base materials 110A and 110B.

[0153] The display body 1 is either one of the display bodies 1A to 1E, or one of these with a back layer 5 provided thereon, or the display body 1F.

[0154] An article made up of substrates 110A and 110B supports the display body 1. Specifically, the substrates 110A and 110B sandwich the display body 1 and are bonded to each other so that the substrate 110A is located on the first main surface S1 side of the display body 1 and the substrate 110B is located on the second main surface SS side of the display body 1. This article has the surface of the substrate 110A facing the substrate 110B as a support surface.

[0155] Here, the substrate 110A has a multilayer structure including layers 110A1, 110A2, and 110A3. The substrate 110A may have a two-layer structure, a multilayer structure including four or more layers, or a single-layer structure. The substrate 110A may also include an image recording layer such as a printing layer. When the substrate 110A has a multilayer structure including two or more layers, each of these layers may be made of the same material as one or more of the other layers, or may be made of a different material. The layers included in the substrate 110A may be made of, for example, resin, metal, paper, glass, ceramics, or a composite material including two or more of these. Here, as an example, the layers 110A1, 110A2, and 110A3 are each made of polycarbonate.

[0156] The layer included in the substrate 110A may be transparent or opaque. As described above, the surface of the substrate 110A facing the substrate 110B is the support surface. When the layer included in the substrate 110A is opaque, the color difference ΔE between the mask layer 3 and this support surface is ＊ ａｂ may be within the range described above in the eighth embodiment.

[0157] Here, the substrate 110B has a multilayer structure including layers 110B1 and 110B2. The layers included in the substrate 110B preferably have visible light transmittance, and more preferably are transparent, at positions corresponding to the portions of the mask layer 3 where the light-transmitting portions 32 are provided. The substrate 110B may have a multilayer structure including three or more layers, or a single-layer structure. When the substrate 110B has a multilayer structure, each of these layers may be made of the same material as one or more of the other layers, or may be made of a different material. The layers included in the substrate 110B may be made of, for example, resin, glass, or a composite material including two or more of these. Here, as an example, the layers 110B1 and 110B2 are each made of polycarbonate.

[0158] The substrates 110A and 110B can be joined together by, for example, heat fusion or via an adhesive. The layers included in the substrate 110A can also be joined together by, for example, heat fusion or via an adhesive. The layers included in the substrate 110B can also be joined together by, for example, heat fusion or via an adhesive.

[0159] In the display-equipped product 100B, it is preferable that the portion of the mask layer 3 where the light-transmitting portion 32 is provided has a large aperture ratio. Also, in the display-equipped product 100B, it is preferable that the ratio S1 / S2 is small. In this case, the adhesion between the substrate 110A and the display member 1 and the adhesion between the substrate 110B and the display member 1 are improved. When the substrate 110A includes an image recording layer such as a printing layer, by employing the above configuration, the image recorded on the substrate 110A can be easily viewed in the region of the mask layer 3 corresponding to the portion where the light-transmitting portion 32 is provided.

[0160] Tenth Embodiment FIG. 24 is a diagram schematically showing a state in which a viewer is viewing an image displayed by a display according to a tenth embodiment of the present invention under certain viewing conditions.

[0161] 24 is the same as the display 1A described in the first embodiment. In the first embodiment, when observing an image displayed by the display 1A, the display 1A is disposed so that the first main surface S1 faces the viewer OB, whereas in the present embodiment, the display 1A is disposed so that the second main surface S2 faces the viewer OB.

[0162] When the surface of the display body 1A facing the mask layer 3 is illuminated with white light and the surface of the display body 1A facing the image display layer is observed, the image displayed by the display body 1A undergoes color changes similar to those described with reference to Figures 3 to 12 by changing the observation direction D. In this way, the surfaces of the display bodies 1A to 1D may be observed either on the mask layer 3 side or on the image display layer side. The surface of the display body 1E facing the image display layer side may also be observed, but in this case, it is preferable that the light-shielding layer 31A and the colored layer 31B are arranged so that the light-shielding layer 31A faces the first main surface S1 with the colored layer 31B sandwiched therebetween.

[0163] <Modifications> The above-described display members, labels, and articles with display members can be modified in various ways.

[0164] For example, a multilayer structure may be employed for one or more of the first layer 4B, the second layer 4R, and the colored layer 31B. The layers included in this multilayer structure may be the same or different colors. The employment of a multilayer structure allows color adjustment by utilizing the color combination, number, and thickness of the layers included in the multilayer structure.

[0165] In addition, instead of adopting a structure in which the adhesive layer 11 faces the second main surface S2 with an image display layer or the like sandwiched therebetween, the label 10 may adopt a structure in which the adhesive layer 11 faces the first main surface S1 with a mask layer 3 sandwiched therebetween.

[0166] In the product 100A with a display body, the display body 1 may be supported by the product 110 so that the second main surface S2 faces the product 110 with the adhesive layer 11, the image display layer, etc. sandwiched therebetween.

[0167] In the product 100B with a display body, the substrates 110A and 110B may sandwich the display body 1 so that the substrate 110B is located on the first main surface S1 side of the display body 1 and the substrate 110A is located on the second main surface SS side of the display body 1.

[0168] <Example 1> Figure 25 is a cross-sectional view showing a first step in the printing method used in the example. Figure 26 is a cross-sectional view showing a second step in the printing method used in the example. Figure 27 is a cross-sectional view showing a third step in the printing method used in the example.

[0169] In this example, the display body 1A described with reference to Figures 1 and 2 was manufactured using the gravure offset printing apparatus shown in Figures 25 to 27. This gravure offset printing apparatus includes a printing plate 210 which is an intaglio plate, a doctor 220 which fills ink 230 into grooves 211 which are recesses in the printing plate 210, a blanket cylinder 240, a blanket 250 fixed to the surface of the blanket cylinder 240, and a printing platen 260.

[0170] The printing plate 210 used was a metal flat plate 100 mm wide and 100 mm long, with grooves 211 formed on one surface by etching. In the printing plate 210 for forming the mask layer 3 (hereinafter also referred to as the printing plate for forming the mask layer), the grooves 211 had a width of 50 μm and a pitch of 100 μm. In the printing plate 210 for forming the first layer 4B and the second layer 4R (hereinafter also referred to as the printing plate for forming the image display layer), the grooves 211 had a width of 40 μm and a pitch of 100 μm.

[0171] The blanket cylinder 240 used was made of SUS304, had a cylinder width of 220 mm, and a diameter of 300 mm.

[0172] The blanket 250 used was made mainly of silicone rubber and had a width of 200 mm and a length of 250 mm.

[0173] The blanket cylinder 240 is rotatably supported by a movable carriage (not shown). The carriage is supported on a stand. A blanket 250 fixed to the surface of the blanket cylinder 240 receives an ink pattern 231, which is formed by filling ink 230 into grooves 211 with a doctor 220 as shown in FIG. 25 , from the printing plate 210 by the blanket cylinder 240 rolling while pressing the blanket 250 against the printing plate 210 as shown in FIG. 26 . Thereafter, as shown in FIG. 27 , the blanket cylinder 240 rolls while pressing the blanket 250 against the transparent material layer 2 placed on a printing platen 260, thereby transferring the ink pattern 231 from the blanket 250 to the transparent material layer 2.

[0174] In this example, the mask layer 3, the first layer 4B and the second layer 4R were formed on the transparent material layer 2 using this gravure offset printing apparatus.

[0175] A polyethylene terephthalate substrate having a width of 150 mm, a length of 150 mm and a thickness of 0.05 mm was used as the transparent material layer 2. First, a mask layer 3 was formed on one main surface of the transparent material layer 2.

[0176] Black gravure offset printing ink was used as the ink for forming the mask layer 3. The printing plate 210 used was the printing plate for forming the mask layer described above.

[0177] The ink pattern 231 made of black ink transferred from the blanket 250 onto the transparent material layer 2 was dried by heating at about 100° C. for 30 minutes. In this way, a mask layer 3 including a mask portion 31 made of the dried ink pattern 231 was obtained.

[0178] Next, a second layer 4R was formed on the surface of the transparent material layer 2 opposite to the surface on which the mask layer 3 was formed. A magenta gravure offset printing ink was used as the ink for forming the second layer 4R. The printing plate 210 used was the printing plate for forming the image display layer described above. Except for these, the second layer 4R was formed in the same manner as described above for the mask layer 3. The second layer 4R was formed so that the position of the center line of each second portion 41R coincided with the position of the boundary between the mask portion 31 and the light-transmitting portion 32.

[0179] Next, the first layer 4B was formed on the surface of the transparent material layer 2 on which the second layer 4R was formed. A cyan gravure offset printing ink was used as the ink for forming the first layer 4B. The printing plate 210 used was the printing plate for forming the image display layer described above. Except for these, the first layer 4B was formed in the same manner as described above for the mask layer 3. Note that, prior to supplying the cyan ink to the printing plate 210, any magenta ink remaining on the printing plate 210 was removed using a cleaning liquid and a rag. The first layer 4B was formed so that the center line of each of the first portions 41B coincided with the boundary between the mask portion 31 and the light-transmitting portion 32.

[0180] In the display member 1A thus obtained, the mask portions 31 of the mask layer 3 had a width of 50 μm, a thickness of 1.0 μm, and were arranged in the width direction at a pitch of 100 μm. The first portions 41B of the first layer 4B had a width of 40 μm, a thickness of 1.1 μm, and were arranged in the width direction at the same pitch as the mask portions 31. The second portions 41R of the second layer 4R had a width of 40 μm, a thickness of 1.0 μm, and were arranged in the width direction at the same pitch as the mask portions 31.

[0181] The reflectance of this display body 1A was measured using an LVmicro-Z manufactured by LambdaVision. Here, the diameter of the measurement area was 15 μm. As a result, the maximum reflectances Rpf1 and Rpf2 were 28% and 29%, respectively, the average reflectances Raf1 and Raf2 were 8% and 7%, respectively, the maximum reflectance Rpb was 30%, and the average reflectance Rab was 10%. The values ​​calculated by substituting these values ​​into the left sides of equations (4) and (5) were 0% and 2%, respectively. In other words, this display body 1A did not satisfy any of the relationships shown in equations (1) to (5). Note that, because the display body 1A does not include a back surface layer 5, the maximum reflectance Rpb and the average reflectance Rab were determined as the arithmetic averages of the values ​​obtained for the surfaces of the first portion 41B and the second portion 41R opposite the surfaces facing the second main surface S2.

[0182] The surface of this display 1A facing the mask layer 3 was illuminated with white light, and the surface facing the image display layer was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display 1A was bright and easy to view.

[0183] The display 1A was attached to a black substrate with the image display layer facing the black substrate. The surface of the display 1A facing the mask layer 3 was illuminated with white light, and the image was observed while changing the observation direction within a plane perpendicular to the Y direction. As a result, the image displayed by the display 1A was dark and difficult to see.

[0184] In this example, the display member 1F described with reference to Fig. 20 was manufactured. The mask layer 3, the image display layer, and the back surface layer 5 were formed using the same gravure offset printing apparatus as used in Example 1.

[0185] The transparent material layer 2 used was a polyethylene terephthalate base material similar to that used in Example 1. First, a mask layer 3 was formed on one main surface of the transparent material layer 2. The mask layer 3 was formed by the same method as that used in Example 1.

[0186] Next, a second layer 4R was formed on the surface of the transparent material layer 2 opposite to the surface on which the mask layer 3 was formed. The second layer 4R was formed in the same manner as in Example 1.

[0187] Next, a portion of the back surface portion 51 included in the back surface layer 5 was formed on the second portion 41R included in the second layer 4R. A white gravure offset printing ink was used as the ink for forming these. The printing plate 210 used was the printing plate for forming the image display layer described above. Except for these, the portion of the back surface portion 51 covering the second portion 41R was formed by the same method as described above for the mask layer 3.

[0188] Next, the first layer 4B was formed on the surface of the transparent material layer 2 on which the second layer 4R and the like had been formed. The first layer 4B was formed in the same manner as in Example 1.

[0189] Next, the remainder of the back surface portion 51 included in the back surface layer 5 was formed on the first portion 41B included in the first layer 4B. The same white ink as above was used as the ink for forming these. The printing plate 210 used was the printing plate for forming the image display layer described above. Except for these, the portion of the back surface portion 51 covering the first portion 41B was formed in the same manner as described above for the mask layer 3. In this way, a back surface layer 5 consisting of the back surface portion 51 covering the first portion 41B and the second portion 41R was obtained.

[0190] In the display member 1F thus obtained, the mask portions 31 of the mask layer 3 had a width of 80 μm, a thickness of 1.3 μm, and were arranged in the width direction at a pitch of 160 μm. The laminate of the first portion 41B of the first layer 4B and the back surface portion 51 of the back surface layer 5 had a width of 70 μm, a thickness of 2.2 μm, and were arranged in the width direction at the same pitch as the mask portions 31. The laminate of the second portion 41R of the second layer 4R and the back surface portion 51 of the back surface layer 5 had a width of 70 μm, a thickness of 2.4 μm, and were arranged in the width direction at the same pitch as the mask portions 31.

[0191] The reflectance of this display 1F was measured using an LVmicro-Z manufactured by LambdaVision. Here, the diameter of the measurement area was the same as in Example 1. As a result, the maximum reflectances Rpf1 and Rpf2 were 39% and 39%, respectively, the average reflectances Raf1 and Raf2 were 23% and 22%, respectively, the maximum reflectance Rpb was 41%, and the average reflectance Rab was 36%. The values ​​calculated by substituting these values ​​into the left sides of equations (4) and (5) were 11% and 12%, respectively. In other words, this display 1F satisfied the relationships shown in equations (1) to (5).

[0192] The surface of this display 1F facing the mask layer 3 was illuminated with white light, and the surface facing the back layer 5 was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display 1F was bright and easy to view.

[0193] Furthermore, this display body 1F was attached to a black substrate with the back surface layer 5 facing the black substrate. The surface of the display body 1F facing the mask layer 3 was illuminated with white light, and the display body 1F was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display body 1F was bright and easy to view.

[0194] Next, the above-described color measurement was carried out on this display body 1F. For this color measurement, a color meter SC-50μ manufactured by Suga Test Instruments Co., Ltd. was used. Here, the diameter of the measurement range was set to 50 μm. As a result, the color difference ΔE between the mask layer 3 and the support surface, which is the surface of the black substrate, was ＊ ａｂ The value was 0.9. When the display 1F and the black substrate to which it was attached were observed with the naked eye under white light illumination, they appeared to be a single unit.

[0195] 20 was produced by the same method as in Example 2, except for the following: In this example, the back surface layer 5 was formed using a silver ink containing silver nanoparticles and a resin, instead of white ink.

[0196] In the display member 1F thus obtained, the mask portions 31 of the mask layer 3 had a width of 50 μm, a thickness of 1.0 μm, and were arranged in the width direction at a pitch of 100 μm. The laminate of the first portion 41B of the first layer 4B and the back surface portion 51 of the back surface layer 5 had a width of 40 μm, a thickness of 2.1 μm, and were arranged in the width direction at the same pitch as the mask portions 31. The laminate of the second portion 41R of the second layer 4R and the back surface portion 51 of the back surface layer 5 had a width of 40 μm, a thickness of 2.2 μm, and were arranged in the width direction at the same pitch as the mask portions 31.

[0197] The reflectance of this display body 1F was measured using an LVmicro-Z manufactured by LambdaVision. Here, the diameter of the measurement area was the same as in Example 1. As a result, the maximum reflectances Rpf1 and Rpf2 were 67% and 65%, respectively, the average reflectances Raf1 and Raf2 were 36% and 35%, respectively, the maximum reflectance Rpb was 93%, and the average reflectance Rab was 91%. The values ​​calculated by substituting these values ​​into the left sides of equations (4) and (5) were 29% and 28%, respectively. In other words, this display body 1F satisfied the relationships shown in equations (1) to (5).

[0198] The surface of this display 1F facing the mask layer 3 was illuminated with white light, and the surface facing the back layer 5 was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display 1F was bright and easy to view.

[0199] Furthermore, this display body 1F was attached to a black substrate with the back surface layer 5 facing the black substrate. The surface of the display body 1F facing the mask layer 3 was illuminated with white light, and the display body 1F was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display body 1F was bright and easy to view.

[0200] Next, the above-described color measurement was carried out on this display body 1F. For this color measurement, a color meter SC-50μ manufactured by Suga Test Instruments Co., Ltd. was used. Here, the diameter of the measurement range was the same as in Example 2. As a result, the color difference ΔE between the mask layer 3 and the support surface, which is the surface of the black substrate, was ＊ ａｂ The value was 1.1. When the display 1F and the black substrate to which it was attached were observed with the naked eye under white light illumination, they appeared to be a single unit.

[0201] 20 was manufactured by the same method as in Example 2, except for the following: In this example, the mask layer 3 was formed using silver ink containing silver nanoparticles and resin instead of black ink.

[0202] In the display member 1F thus obtained, the mask portions 31 of the mask layer 3 had a width of 80 μm, a thickness of 1.3 μm, and were arranged in the width direction at a pitch of 160 μm. The laminate of the first portion 41B of the first layer 4B and the back surface portion 51 of the back surface layer 5 had a width of 70 μm, a thickness of 2.2 μm, and were arranged in the width direction at the same pitch as the mask portions 31. The laminate of the second portion 41R of the second layer 4R and the back surface portion 51 of the back surface layer 5 had a width of 70 μm, a thickness of 2.2 μm, and were arranged in the width direction at the same pitch as the mask portions 31.

[0203] The reflectance of this display 1F was measured using an LVmicro-Z manufactured by LambdaVision. Here, the diameter of the measurement area was the same as in Example 1. As a result, the maximum reflectances Rpf1 and Rpf2 were 38% and 37%, respectively, the average reflectances Raf1 and Raf2 were 22% and 20%, respectively, the maximum reflectance Rpb was 40%, and the average reflectance Rab was 37%. The values ​​calculated by substituting these values ​​into the left sides of equations (4) and (5) were 13% and 14%, respectively. In other words, this display 1F satisfied the relationships shown in equations (1) to (5).

[0204] The surface of this display 1F facing the mask layer 3 was illuminated with white light, and the surface facing the back layer 5 was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display 1F was bright and easy to view.

[0205] Furthermore, this display member 1F was attached to a silver metal color substrate with the back layer 5 facing the silver metal color substrate. The surface of the display member 1F facing the mask layer 3 was illuminated with white light, and the display member 1F was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display member 1F was bright and easy to view.

[0206] Next, the above-described color measurement was carried out on this display body 1F. For this color measurement, a color meter SC-50μ manufactured by Suga Test Instruments Co., Ltd. was used. Here, the diameter of the measurement range was the same as in Example 2. As a result, the color difference ΔE between the mask layer 3 and the support surface, which is the surface of the silver metal color substrate, was ＊ ａｂ The value was 3.1. When the display 1F and the silver metal color substrate to which it was attached were observed with the naked eye under white light illumination, they appeared to be a single unit.

[0207] Example 5 In this example, the display 1F described with reference to FIG. 20 was manufactured by the same method as in Example 4.

[0208] This display 1F was attached to a substrate of a different metallic color from the silver metallic color, with the back layer 5 facing the metallic color substrate. The surface of the display 1F facing the mask layer 3 was then illuminated with white light, and the image was observed while changing the observation direction in a plane perpendicular to the Y direction. As a result, the color of the image changed significantly depending on the observation direction. Furthermore, the image displayed by the display 1F was bright and easy to view.

[0209] Next, the above-described color measurement was carried out on this display body 1F. For this color measurement, a color meter SC-50μ manufactured by Suga Test Instruments Co., Ltd. was used. Here, the diameter of the measurement range was the same as in Example 2. As a result, the color difference ΔE between the mask layer 3 and the support surface, which is the surface of the metal-colored substrate, was ＊ ａｂ The color difference was 12.5. When the display body 1F and the metallic color substrate to which it was attached were observed with the naked eye under white light illumination conditions, there was a large difference in color between them, and it was easy to see that the display body 1F was attached to the metallic color substrate.

[0210] 20 was produced in the same manner as in Example 2, except for the following: In this example, the back surface layer 5 was formed using black ink instead of white ink.

[0211] In the display member 1F thus obtained, the mask portions 31 of the mask layer 3 had a width of 50 μm, a thickness of 1.1 μm, and were arranged in the width direction at a pitch of 100 μm. The laminate of the first portion 41B of the first layer 4B and the back surface portion 51 of the back surface layer 5 had a width of 40 μm, a thickness of 2.3 μm, and was arranged in the width direction at the same pitch as the mask portions 31. The laminate of the second portion 41R of the second layer 4R and the back surface portion 51 of the back surface layer 5 had a width of 40 μm, a thickness of 2.2 μm, and was arranged in the width direction at the same pitch as the mask portions 31.

[0212] The reflectance of this display 1F was measured using an LVmicro-Z manufactured by LambdaVision. Here, the diameter of the measurement area was the same as in Example 1. As a result, the maximum reflectances Rpf1 and Rpf2 were 15% and 13%, respectively, the average reflectances Raf1 and Raf2 were 5% and 4%, respectively, the maximum reflectance Rpb was 4%, and the average reflectance Rab was 3%. The values ​​calculated by substituting these values ​​into the left sides of equations (4) and (5) were 9% and 8%, respectively. In other words, this display 1F did not satisfy any of the relationships shown in equations (1) to (5).

[0213] The surface of this display body 1F facing the mask layer 3 was illuminated with white light, and the surface facing the back surface layer 5 was observed while changing the observation direction within a plane perpendicular to the Y direction. As a result, the color of the image changed depending on the observation direction, but the image displayed by the display body 1F was dark and difficult to see.

[0214] This display member 1F was attached to a black substrate with the back surface layer 5 facing the black substrate. The surface of the display member 1F facing the mask layer 3 was illuminated with white light, and the image was observed while changing the observation direction within a plane perpendicular to the Y direction. As a result, the image displayed by the display member 1F was dark and difficult to view.

[0215] Next, the above-described color measurement was carried out on this display body 1F. For this color measurement, a color meter SC-50μ manufactured by Suga Test Instruments Co., Ltd. was used. Here, the diameter of the measurement range was the same as in Example 2. As a result, the color difference ΔE between the mask layer 3 and the support surface, which is the surface of the black substrate, was ＊ ａｂ The value was 1.1. When the display 1F and the black substrate to which it was attached were observed with the naked eye under white light illumination, they appeared to be a single unit.

[0216] 1...display body, 1A...display body, 1B...display body, 1C...display body, 1D...display body, 1E...display body, 1F...display body, 2...transparent material layer, 3...mask layer, 4B...first layer, 4R...second layer, 5...back surface layer, 10...label, 11...adhesive layer, 31...mask portion, 31A...light-shielding layer, 31B...colored layer, 32...light-transmitting portion, 41B...first portion, 41R...second portion, 51...back surface portion, 100A...article with display body, 100B...article with display body, 110...article, 110A...substrate, 110A1...layer, 110A2...layer, 110A3...layer, 110B...substrate, 110B1...layer, 110B2...layer, OB...observer, D...observation direction.

Claims

1. A display body comprising: a transparent material layer having a first main surface and a second main surface which is the back surface thereof; a mask layer provided on the first main surface and having a plurality of regularly arranged light transmission portions; and an image display layer provided on the second main surface, wherein the image display layer includes a first layer for displaying a first color and a second layer for displaying a second color different from the first color, the first layer includes a plurality of first portions arranged in a first arrangement direction of the plurality of light transmission portions with a pitch the same as the pitch of the plurality of light transmission portions in the first arrangement direction, the second layer includes a plurality of second portions arranged alternately with the plurality of first portions in the first arrangement direction, and each of the plurality of first portions and the plurality of second portions includes: one or more first regions that can each be observed through one of the plurality of light transmission portions when observed from a normal direction perpendicular to the first main surface; and one or more second regions that cannot be observed through any of the plurality of light transmission portions when observed from the normal direction.

2. The display body according to claim 1, wherein the mask layer is light-shielding.

3. The display body according to claim 1 or 2, wherein an aperture ratio of a portion of the mask layer where the plurality of light transmission portions are provided is in a range of 10% to 90%.

4. The display body according to any one of claims 1 to 3, wherein a ratio S1 / S2 of a total area S1 of the first regions for all of the plurality of first portions and the plurality of second portions to a total area S2 of the plurality of light transmission portions is in a range of 10% to 100%.

5. The display body according to any one of claims 1 to 4, wherein an arrangement of the plurality of first portions and an arrangement of the plurality of second portions have the same shape.

6. The display body according to any one of claims 1 to 5, wherein each of the plurality of light transmission portions is strip-shaped, regularly arranged in a width direction, and each of the plurality of first portions and the plurality of second portions extends in a length direction of the plurality of light transmission portions.

7. The display body according to claim 6, wherein the plurality of light transmission portions are arranged in a stripe shape.

8. The display body according to claim 6, wherein the plurality of light transmission portions are arranged in a nested shape.

9. The display body according to any one of claims 1 to 5, wherein a portion of the mask layer where the plurality of light transmission portions are provided is grid-shaped.

10. The display body according to claim 9, wherein each of the plurality of first portions and the plurality of second portions has a shape extending in a second arrangement direction of the plurality of light transmission portions.

11. The display according to claim 10, wherein each of the plurality of first portions and the plurality of second portions has one side along its longitudinal direction being wavy.

12. The display according to any one of claims 1 to 5, wherein the portion of the mask layer where the plurality of light transmissive portions are provided is in a checkered pattern.

13. The display according to claim 12, wherein the plurality of first portions are arranged in a checkered pattern corresponding to the plurality of light transmissive portions, and the plurality of first portions and the plurality of second portions are alternately arranged in each of the first arrangement direction of the plurality of light transmissive portions and the second arrangement direction of the plurality of light transmissive portions.

14. The display according to any one of claims 1 to 13, further comprising a back surface layer facing the second main surface with the image display layer interposed therebetween.

15. The display according to claim 14, wherein the back surface layer is a reflective layer or is made of an ink containing a light-reflective or light-scattering pigment.

16. The maximum value Rpf1 of the reflectance measured within a wavelength range of 400 to 700 nm through the light transmissive portion for the plurality of first portions, the average value Raf1 of the reflectance measured within a wavelength range of 400 to 700 nm through the light transmissive portion for the plurality of first portions, the maximum value Rpf2 of the reflectance measured within a wavelength range of 400 to 700 nm through the light transmissive portion for the plurality of second portions, the average value Raf2 of the reflectance measured within a wavelength range of 400 to 700 nm through the light transmissive portion for the plurality of second portions, the maximum value Rpb of the reflectance measured within a wavelength range of 400 to 700 nm for the surface of the back surface layer opposite to the surface facing the second main surface, and the average value Rab of the reflectance measured within a wavelength range of 400 to 700 nm for the surface of the back surface layer opposite to the surface facing the second main surface satisfy the relationships shown in the following formulas (1) to (5). Raf1 ≥ 20%... (1) Raf2 ≥ 20%... (2) Rab ≥ 30%... (3) (Rpf1 - Raf1) - (Rpb - Rab) ≥ 10%... (4) (Rpf2 - Raf2) - (Rpb - Rab) ≥ 10%... (5) The display according to claim 14 or 15.

17. The display according to any one of claims 1 to 16, wherein the mask layer is a black layer, a white layer, or a metal layer.

18. The display according to any one of claims 1 to 16, wherein the mask layer includes a light-shielding layer and a colored layer facing the first main surface with the light-shielding layer interposed therebetween.

19. A label including the display according to any one of claims 1 to 18 and an adhesive layer facing the second main surface with the image display layer interposed therebetween.

20. An article with a display including the display according to any one of claims 1 to 18 and an article supporting the display.

21. The article has a support surface, and the display body is supported by the article such that the second main surface faces the support surface with the image display layer interposed therebetween, and the color difference ΔE between the mask layer and the support surface ＊ ａｂ is 5 or less, and the article with a display body according to claim 20.

Images