JP2018045155A - Display body, device attached with display device, and display body manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display body and device with the display body that can improve clearness of a hue to be visually recognized, and to provide a display body manufacturing method.SOLUTION: A display body comprises: a concavity/convexity structure layer 12 that has a front surface and a rear surface, is a dielectric body equipped with a plurality of convexity parts 12b protruding toward the front surface from a surface along the rear surface, and located in a two-dimensional lattice shape having a sub wavelength cycle when viewed from a direction opposing the front surface; a metal layer 13 that is located on a front surface side with respect to the concavity/convexity structure layer 12 to contact with the concavity/convexity structure layer 12, and has a shape following a front surface shape of the concavity/convexity structure layer 12; and a multilayer film layer 14 that generates multilayer film interference, and is located on a front surface side with respect to the metal layer 13 to cover a structure body composed of the concavity/convexity structure layer 12 and the metal layer 13.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display body, a device with a display body, and a method for manufacturing the display body.

  The display body exhibits a structural color using light interference by a diffraction grating or a multilayer film (see, for example, Patent Document 1). For example, it is difficult to counterfeit an article by providing it on an article that is required to be counterfeited, such as authentication documents such as passports and licenses, and securities such as gift certificates and checks. Increase sex. Moreover, the display body improves the designability of an article by being provided in an article around us.

Japanese Patent No. 5124272

In order to further increase the difficulty of counterfeiting and the design of an article, a plurality of display bodies exhibiting different hues may be incorporated into one article, or a plurality of areas exhibiting different hues may be incorporated into one display body. Has been tried. In order to further enhance the difficulty and design of counterfeiting in such attempts, the difference between hues that are different from each other is clear, that is, the hue that each display body bears, or the hue that each area bears. It is desirable that is clear.
It is an object of the present invention to provide a display body, a device with a display body, and a method for manufacturing the display body, which can increase the visibility of a visually recognized hue.

  A display body that solves the above problem is a display body that has a front surface and a back surface, and is a plurality of convex portions that protrude from the surface along the back surface toward the front surface, as viewed from the direction facing the front surface. A concavo-convex structure layer, which is a dielectric having the plurality of convex portions located in a two-dimensional lattice shape having a sub-wavelength period, and is in contact with the concavo-convex structure layer located on the surface side with respect to the concavo-convex structure layer, A metal layer having a shape that follows the surface shape of the concavo-convex structure layer; and a multilayer film layer that causes multi-layer interference, wherein the concavo-convex structure layer and the metal layer are located on the surface side of the metal layer. And the multilayer film layer covering the structure composed of:

  According to the above configuration, when light is irradiated from the outside of the display body toward the surface of the display body, light in a predetermined wavelength region is strengthened by interference in the multilayer film layer and emitted to the surface side of the display body. The In the structure composed of the metal layer and the concavo-convex structure layer, the light transmitted through the multilayer layer becomes a surface plasmon due to the combination of light and collective vibration of electrons, that is, the plasmon resonance phenomenon. It passes through the body or through the structure from a locally thinned portion of the metal layer located on the uneven structure layer. In addition, the surface plasmon which permeate | transmitted the said structure is reconverted into light, when it inject | emits to a back surface side. Therefore, the light transmitted through the multilayer film layer can be suppressed from being emitted to the surface side of the display body. Therefore, on the surface side of the display body, it is possible to suppress the emission of light in a wavelength region different from the light in the wavelength region strengthened by the multilayer film layer, so that it is visually recognized when the display body is viewed from the surface side. Hue clarity is enhanced.

  In the display body, an area including the concavo-convex structure layer, the metal layer, and the multilayer film layer is a display area, and the display area includes a first display area and a second display area when viewed from a direction facing the surface. In surface reflection observation in which white light is irradiated from the outside of the display body toward the surface to observe the display body from the surface side, the first display area and the second display area May be configured to exhibit colors of different hues.

According to the above configuration, the first display area and the second display area exhibit colors of different hues in the surface reflection observation. And since each of the first display area and the second display area has enhanced visibility, the difference between the hue of the first display area and the hue of the second display area becomes clear, The visibility of the image expressed by these areas is improved. Therefore, the forgery difficulty and the design are improved in the article including the display body.
In the display body, the period of the protrusions in the first display area and the period of the protrusions in the second display area may be different from each other.

  According to the above configuration, the hue of the first display area and the hue of the second display area are changed using the difference in the period of the convex portions. According to such a configuration, compared with a configuration in which the hue of the first display region is different from the hue of the second display region only by the layer configuration such as the number of layers, the material, and the film thickness of the multilayer film layer, High degree of freedom in hue adjustment. Further, according to the above configuration, the multilayer configuration of the multilayer film layer in the two regions is compared with the configuration in which the hue of the first display region and the hue of the second display region are different only by the layer configuration of the multilayer film layer. It is also possible to reduce the difference. Since it is easier to form convex portions having different periods in the two regions compared to stacking multilayer film layers having different layer configurations in the two regions, according to the above configuration, The manufacturing process can be simplified.

  In the display body, the region including the concavo-convex structure layer, the metal layer, and the multilayer layer is a display region, and the display body further includes an auxiliary region including a metal layer as a region different from the display region. In the surface reflection observation in which white light is irradiated from the outside of the display body toward the surface to observe the display body from the surface side, the auxiliary region may be configured to exhibit a metallic luster. Good.

According to the above configuration, in the surface reflection observation, the display area and the auxiliary area appear to have different textures. Therefore, a variety of expressions can be made by the display area and the auxiliary area, and the forgery difficulty and the design are enhanced in the article including the display body.
In the display, the metal layer included in the display area and the metal layer included in the auxiliary area may be one continuous layer.

According to the above configuration, the metal layer provided in the display region and the metal layer provided in the auxiliary region are one continuous layer, so that the display body is compared with the configuration in which these layers are separate layers. It is possible to reduce the number of layers included in.
The device with a display body that solves the above problems includes the display body and a solar cell that is positioned on the back surface side of the display body.

  According to the above configuration, when the display body is observed from the surface side in a state where sunlight is irradiated from the outside of the device with the display body toward the surface of the display body, an image with enhanced hue is visually recognized. The And the light of the predetermined wavelength which permeate | transmitted the structure which consists of a metal layer and an uneven structure body layer, and was inject | emitted on the back surface side of the display body is utilized for the electric power generation by a solar cell. Therefore, since the area for forming an image on the display body can be used as an area for transmitting light to the solar cell, it is possible to improve both the design of the device with the display body and the power generation efficiency of the solar cell. It is.

  A device with a display body that solves the above problems is arranged at a position facing the display body and a part of the back surface of the display body, and configured to emit light toward the back surface of the display body. A light emitting structure.

  According to the above configuration, a part of the light emitted from the light emitting structure passes through the display body and is emitted to the surface side. Therefore, when the display body is observed from the surface side in a state where light is irradiated from the outside of the device with the display body toward the surface of the display body, the hue of the portion of the display body that does not overlap with the light emitting structure is determined. An image with enhanced sharpness is visually recognized, and in the portion of the display that overlaps with the light emitting structure, a color different from that of the portion that does not overlap with the light emitting structure is visually recognized. An image corresponding to the shape of the can be seen. Therefore, more various images can be expressed, and the forgery difficulty and design of the display-equipped device are enhanced.

The manufacturing method of the display body which solves the above-mentioned subject forms a plurality of convex parts which consist of the above-mentioned resin by pressing the intaglio to the resin coated on the surface of the base material and hardens the above-mentioned resin. A first step of forming a concavo-convex structure layer comprising the plurality of convex portions located in a two-dimensional lattice shape having a sub-wavelength period when viewed from a direction facing the surface of the substrate; and a surface shape of the concavo-convex structure layer A second step of forming a metal layer having a shape to follow on the concavo-convex structure layer; and a multilayer film layer that causes multilayer film interference on the structure including the concavo-convex structure layer and the metal layer. Forming a third step.
According to the said manufacturing method, the uneven structure layer which has a fine unevenness | corrugation can be formed suitably.

In the manufacturing method, in the display body, a region including the concavo-convex structure layer, the metal layer, and the multilayer film layer is a display region, and the display region is two regions having different periods of the convex portions. A first display area and a second display area may be included, and in the first step, the convex part of the first display area and the convex part of the second display area may be formed simultaneously.
According to the said manufacturing method, a display body can be manufactured efficiently compared with the manufacturing method which forms the convex part of a 1st display area, and the convex part of a 2nd display area in another process.

  ADVANTAGE OF THE INVENTION According to this invention, the clearness of the hue visually recognized can be improved in a display body.

The top view which shows the planar structure in one Embodiment of a display body. The figure which shows the cross-sectional structure in the display area of a display body, and the planar structure of an uneven structure layer. Sectional drawing which shows the cross-sectional structure in the auxiliary | assistant area | region of a display body. The effect | action figure which shows the effect | action of the display body of 1st Embodiment by the reflection observation by the surface side. The action figure which shows the effect | action of the display body of 2nd Embodiment by the reflection observation by the surface side, and the transmission observation by the back surface side. The effect | action figure which shows the effect | action of the display body of 2nd Embodiment by the transmission observation by the surface side, and the reflection observation by the back surface side. The figure which shows an example of the articles | goods provided with the display body of 2nd Embodiment. The figure which shows typically the structure of the device with a display body of 3rd Embodiment. The top view which shows an example of the planar structure of the display body with which the device with a display body of 3rd Embodiment is provided. The effect | action figure which shows the effect | action of the device with a display body of 3rd Embodiment. The figure which shows typically the structure of the device with a display body of 4th Embodiment. The top view which shows an example of the planar structure of the device with a display body of 4th Embodiment. The effect | action figure which shows the effect | action of the device with a display body of 4th Embodiment.

  Embodiments of a display body, a device with a display body, and a method for manufacturing the display body will be described with reference to the drawings. In the following, the first to fourth embodiments will be described. In these embodiments, since the basic structure of the display body is common, first, the basic structure of the display body and the manufacturing method thereof will be described. .

[Display structure]
As shown in FIG. 1, the display body 10 includes a front surface 10F and a back surface 10R that is a surface opposite to the front surface 10F, and the display body 10 has a display area when viewed from the direction facing the front surface 10F. 20 and the auxiliary area 30 are included. The display area 20 includes two types of areas, a first display area 20A and a second display area 20B, and the surface 10F is divided into a first display area 20A, a second display area 20B, and an auxiliary area 30. It is partitioned. The display area 20 exhibits a structural color, and the hue exhibited by the first display area 20A and the hue exhibited by the second display area 20B are different from each other when the surface 10F is irradiated with white light. The auxiliary region 30 exhibits a color having a metallic luster.

  For example, characters, symbols, figures, patterns, pictures, and the like are expressed by the first display area 20A and the second display area 20B, and the background is expressed by the auxiliary area 30. As an example, in the configuration shown in FIG. 1, the design of the earth is represented by the first display area 20 </ b> A that exhibits a green color and the second display area 20 </ b> B that exhibits a blue color, and the background is represented by the auxiliary area 30 that exhibits a silver color. Is expressed.

The structure of the display area 20 will be described with reference to FIG.
As shown in FIG. 2, in the display region 20, the display body 10 includes a base material 11, an uneven structure layer 12, a metal layer 13, and a multilayer film layer 14. The base material 11, the concavo-convex structure layer 12, the metal layer 13, and the multilayer film layer 14 are arranged in this order, and the side where the multilayer film layer 14 is located with respect to the base material 11 is the surface side of the display body 10, The side where the base material 11 is located with respect to the multilayer film layer 14 is the back side of the display body 10. FIG. 2 shows the planar structure of the concavo-convex structure layer 12 as viewed from the direction facing the surface 10F of the display body 10 along with the cross-sectional structure of the display region 20.

The base material 11 has a plate shape, and the surface located on the surface side of the display body 10 among the surfaces of the base material 11 is the surface of the base material 11. The substrate 11 is transparent to light in the visible region and transmits light in the visible region. The wavelength of light in the visible region is from 400 nm to 800 nm. The substrate 11 is a dielectric, and examples of the material of the substrate 11 include synthetic quartz, resins such as PET (polyethylene terephthalate), PC (polycarbonate), and PEN (polyethylene naphthalate). The refractive index of the base material 11 is higher than that of the air layer and is, for example, 1.2 or more and 1.7 or less. The base material 11 may be comprised from one layer, and may be comprised from the some layer.
The plasmon structure layer 15, which is a structure composed of the concavo-convex structure layer 12 and the metal layer 13, transmits incident light by plasmon resonance or the like.

  The concavo-convex structure layer 12 includes a flat portion 12a extending along the surface of the substrate 11, and a plurality of convex portions 12b protruding from the flat portion 12a to the surface side of the display body 10. That is, the convex part 12b protrudes from the surface which spreads along the back surface 10R of the display body 10 toward the front surface 10F. The concavo-convex structure layer 12 is a dielectric that is transparent to light in the visible region, and is made of, for example, an ultraviolet curable resin, a thermosetting resin, or a thermoplastic resin. The refractive index of the uneven structure layer 12 is higher than that of the air layer.

  The convex portion 12 b has a quadrangular pyramid shape, that is, a shape in which the top of the quadrangular pyramid is a plane, and the width of the convex portion 12 b in the direction along the surface of the substrate 11 is the width of the display body 10. It gradually decreases in the direction from the back surface 10R toward the front surface 10F.

  The length from the proximal end to the distal end of the convex portion 12b, that is, the length of the convex portion 12b in the extending direction of the convex portion 12b is the convex portion height H, and one side of the square constituting the base portion of the convex portion 12b The length is the protrusion width D. In view of easily obtaining the processing accuracy of the convex portion 12b, the aspect ratio Ar (Ar = H / D), which is the ratio of the convex portion height H to the convex portion width D, is preferably 3 or less. More preferably, it is 2 or less.

  The plurality of convex portions 12b are arranged in a square array, which is an example of a two-dimensional lattice, when viewed from the direction facing the surface 10F of the display body 10. The square array is an array in which the center of the convex portion 12b is located at each vertex of the square SQ whose one side is the structural period P. That is, the structure period P is the distance between the centers of the two adjacent protrusions 12b, and the structure period P is the distance between the protrusions W that is the distance between the two adjacent protrusions 12b. It is the total with the convex part width D. The structural period P is a length equal to or shorter than the wavelength in the visible region, that is, the structural period P is a sub-wavelength period. From the viewpoint of easily obtaining the processing accuracy of the convex portion 12b, the structural period P is preferably not less than 100 nm and not more than 400 nm, and more preferably not less than 200 nm and not more than 400 nm.

  The area Sa of the entire region where the plurality of convex portions 12b are arranged is the area of the concavo-convex structure layer 12 as viewed from the direction facing the surface 10F of the display body 10, that is, exposed between the convex portions 12b. This is the sum of the area of the flat part 12a and the area of the square that forms the base of each convex part 12b. From the viewpoint of easily obtaining the processing accuracy of the convex portion 12b, the volume ratio Vr that is the ratio of the individual volumes of the plurality of convex portions 12b to the volume represented by the area Sa × the convex portion height H is: 0.05 or more and 0.5 or less is preferable. In other words, the volume ratio Vr is a ratio of the convex portion 12b occupying per unit volume of the space where the concavo-convex structure is formed on the flat portion 12a. The distance W between the protrusions may be determined in consideration of the desired volume ratio Vr, the structure period P, and the shape of the protrusion 12b.

  The metal layer 13 is positioned on the surface side of the display body 10 with respect to the concavo-convex structure layer 12 and covers the entire surface of the concavo-convex structure layer 12. The metal layer 13 has a shape that follows the surface shape of the concavo-convex structure layer 12. That is, the surface of the metal layer 13 has unevenness following the unevenness of the uneven structure layer 12. The period and height of the concavo-convex structure in the metal layer 13 are the period and height of the concavo-convex structure in the concavo-convex structure layer 12, that is, the structural period P, the inter-convex distance W, the convex part height H, and the convex part width D. It depends on the shape of the included convex part 12b.

  The metal layer 13 is made of a metal material, and the refractive index of the metal layer 13 is lower than that of the air layer. From the standpoint that plasmon resonance is likely to occur, the metal layer 13 is made of a metal material having a negative real part of the complex dielectric constant at a wavelength in the visible region, and the film thickness of the metal layer 13 is 10 nm. The thickness is preferably 200 nm or more. Examples of the material of the metal layer 13 include aluminum, gold, silver, tantalum, and indium.

  Note that, in the concavo-convex structure layer 12, the area of the flat portion 12 a exposed from between the convex portions 12 b in the concavo-convex structure layer 12 is a square area constituting the base of each convex portion 12 b when viewed from the direction facing the surface 10 F of the display body 10. It is preferable to be larger than the total. In this case, in the region immediately above the flat portion 12a, that is, in the region including the portion of the metal layer 13 laminated on the flat portion 12a and the base of the convex portion 12b, the metal layer 13 is structurally and optically It is a sea component, and the base of the convex portion 12b is an island component that is structurally and optically distributed in the sea component.

  The multilayer film layer 14 has a structure in which a plurality of thin films 14a are stacked, and causes multilayer film interference. That is, when the multilayer film 14 receives incident light from the surface side of the display body 10, the multilayer film layer 14 strongly returns light in a specific wavelength region as a result of interference of light reflected by each thin film 14a. Thereby, the structural color of a specific hue is visually recognized in the display area 20 when viewed from the front surface side of the display body 10.

  The multilayer film layer 14 has a shape that repeats undulations according to the unevenness of the metal layer 13, in other words, a curved portion that swells toward the surface side of the display body 10 extends in the arrangement direction of the protrusions 12 b in the uneven structure layer 12. It has a shape that continues along. For example, the portion of the multilayer film 14 that is closest to the back surface 10 </ b> R of the display body 10, that is, the end portion of the curved portion, extends into the region between the convex portions 12 b in the concavo-convex structure layer 12. The degree of curvature of each thin film 14 a varies depending on the position of the thin film 14 a in the multilayer film layer 14.

The thin film 14a is made of a material that is transparent to light in the visible region, and the refractive indexes of the plurality of thin films 14a are different from each other. Examples of the material of the thin film 14a include TiO ₂ (titanium oxide), SiO ₂ (silicon oxide), Al ₂ O ₃ (aluminum oxide), Nb ₂ O ₅ (niobium oxide), Ta ₂ O ₅ (tantalum oxide), Inorganic substances such as HfO ₂ (hafnium oxide), ZnS (zinc sulfide), and ZrO ₂ (zirconium oxide), and polymer compounds such as nylon and polyester can be used.

  The number of thin films 14a included in the multilayer film layer 14 and the material and film thickness of each thin film 14a depend on the hue that the display area 20 wants to visually recognize when the reflected light is viewed from the surface side of the display body 10, It is set so that light in a wavelength region corresponding to this hue is intensified and reflected from the multilayer film layer 14.

  In addition, since the length of the optical path of light passing through the thin film 14a varies depending on the degree of curvature of the thin film 14a, the wavelength of light that is strengthened by interference in the multilayer film layer 14 also varies. Therefore, the display body is also changed by changing the shape of the convex portion 12b including the convex portion 12b including the structural period P and the convex portion distance W in the concave-convex structure layer 12 and the convex portion height H and the convex portion width D. When the reflected light is viewed from the front surface side, the hue of the color visually recognized in the display area 20 can be changed.

  For example, when the shape of the convex part 12b is constant, the larger the structural period P, the larger the distance W between the convex parts, and the larger the multilayer film layer 14 located in the region between the convex parts 12b. As a result, since the length of the optical path of the light passing through the thin film 14a is increased, light having a longer wavelength is strengthened and reflected from the multilayer film layer 14.

  That is, the configuration of each thin film 14a in the multilayer film layer 14 and the arrangement and shape of the protrusions 12b in the concavo-convex structure layer 12 are visually recognized as colors displayed in the display region 20 when the reflected light is viewed from the surface side of the display body 10. Depending on the desired hue, light in the wavelength region corresponding to this hue is intensified and adjusted so as to be reflected from the multilayer film layer 14. The first display area 20A and the second display area 20B are different from each other in the configuration of each thin film 14a in the multilayer film layer 14 and the arrangement and shape of the protrusions 12b in the concavo-convex structure layer 12. Therefore, when the reflected light is viewed from the surface side of the display body 10, different hues are exhibited.

  In particular, the formation of the convex portions 12b having different structural periods P in the two regions 20A and 20B means that the two regions 20A and 20B are multilayer films having different layer configurations such as the number, material, and film thickness of the thin film 14a. Since it is easier than forming the layer 14, it is preferable that the hue of the first display area 20 </ b> A and the hue of the second display area 20 </ b> B are made different depending on the difference in the structural period P. That is, it is preferable that the multilayer film layer 14 in the first display region 20A and the multilayer film layer 14 in the second display region 20B are one multilayer structure having the same layer configuration and continuous with each other.

The structure of the auxiliary region 30 will be described with reference to FIG.
As shown in FIG. 3, the auxiliary region 30 includes a base material 11 and a metal layer 13, and the flat metal layer 13 is located on the surface of the base material 11. The base material 11 is a single continuous structure in the display area 20 and the auxiliary area 30, and the metal layer 13 is a single layer continuous in the display area 20 and the auxiliary area 30. Thereby, when receiving incident light from the surface side of the display body 10, the auxiliary region 30 appears to have a metallic luster with a color corresponding to the material of the metal layer 13 when viewed from the surface side.

[Manufacturing method of display body]
A method for manufacturing the display body 10 will be described.
First, a method for manufacturing the display area 20 will be described. First, the uneven structure layer 12 is formed on the surface of the substrate 11. Examples of the method for forming the convex portion 12b in the concavo-convex structure layer 12 include a photolithographic method using a light or charged particle beam, a nanoimprint method, and a plasma etching method. Among these, the nanoimprint method is suitable for forming the uneven structure layer 12 having fine unevenness.

  When the nanoimprint method is used, for example, a polyethylene terephthalate sheet is used as the base material 11, and an ultraviolet curable resin is applied to the surface of the base material 11. Next, a synthetic quartz mold, which is an intaglio plate having concave portions having a shape and arrangement following the convex portion 12b, is pressed against the surface of the coating film made of an ultraviolet curable resin, and the coating film and the synthetic quartz mold are irradiated with ultraviolet rays. . Subsequently, the synthetic quartz mold is released from the cured ultraviolet curable resin. Thereby, the convex part 12b is formed and the uneven structure layer 12 is shape | molded. Note that a thermosetting resin may be used instead of the ultraviolet curable resin, and in this case, the irradiation of the ultraviolet light may be changed to heat. In addition, a thermoplastic resin may be used instead of the ultraviolet curable resin, and in this case, the irradiation with ultraviolet light may be changed to heating and cooling.

  When the first display area 20A and the second display area 20B are different in the arrangement and shape of the convex portions 12b in the concavo-convex structure layer 12, the portion corresponding to the first display area 20A and the second display area 20B By changing the arrangement and shape of the concave portions in the synthetic quartz mold with the corresponding portions, the concave-convex structure layer 12 in the first display region 20A and the concave-convex structure layer 12 in the second display region 20B can be formed simultaneously.

  Next, the metal layer 13 is formed on the surface of the uneven structure layer 12. Examples of the method for forming the metal layer 13 include a vacuum deposition method and a sputtering method. Furthermore, the multilayer film layer 14 is formed by sequentially forming the thin film 14 a on the surface of the metal layer 13. Examples of the method for forming the thin film 14a include a vacuum deposition method and a sputtering method. Thereby, the laminated structure of the display area 20 is formed.

  The auxiliary region 30 can be manufactured by not performing the formation process of the concavo-convex structure layer 12 and the formation process of the multilayer film layer 14 in the manufacturing process of the display region 20. That is, the metal layer 13 is formed on the surface of the substrate 11 in the auxiliary region 30 simultaneously with the formation of the metal layer 13 in the display region 20.

[Modifications of display body]
The structure of the display area 20 in the display body 10 may be changed as follows.
The base material 11 and the concavo-convex structure layer 12 may be integrated. Further, the concavo-convex structure layer 12 may not include the flat portion 12 a and the convex portion 12 b may protrude from the surface of the base material 11.
The convex portion 12b is not limited to a quadrangular pyramid shape, and may be a rectangular parallelepiped shape, a truncated cone shape, or a cylindrical shape. That is, the width of the convex portion 12b in the direction along the surface of the substrate 11 may be constant, or the shape of the convex portion 12b viewed from the direction facing the surface 10F of the display body 10 may be circular. Good. Furthermore, the convex portion 12b may have a shape that does not have a flat surface at the tip, such as a pyramid shape or a cone shape.

  The arrangement of the convex portions 12b viewed from the direction facing the surface 10F of the display body 10 is not limited to a square arrangement, and may be a two-dimensional lattice shape. The square array is an array in which convex portions 12b are arranged along each of two orthogonal directions in the two-dimensional plane. The two-dimensional lattice-like array includes 90 degrees in the two-dimensional plane in addition to the square array. An array in which the convex portions 12b are arranged along each of two directions intersecting at different angles is included.

The metal layer 13 does not cover the entire surface of the concavo-convex structure layer 12, and may be located, for example, on the flat part 12a exposed between the convex parts 12b and on the top part of the convex parts 12b. In short, the metal layer 13 only needs to have a shape in which the shape of the entire layer follows the surface shape of the uneven structure layer 12, in other words, the metal layer 13 protrudes toward the surface side. What is necessary is just to have the shape where the part is scattered in the two-dimensional lattice shape along arrangement | positioning of the convex part 12b.
In short, the concavo-convex structure layer 12 and the metal layer 13 only need to have a structure in which the plasmon structure layer 15 made of these layers transmits incident light by plasmon resonance or the like. The reason why the incident light is transmitted is mainly due to the occurrence of plasmon resonance. The reason for the transmission is that, in addition to the plasmon resonance, the incident light is transmitted through the structure from a locally thinned portion of the metal layer 13. It is also included.

(First embodiment)
The first embodiment will be described with reference to FIG. 1st Embodiment is embodiment of a display body, and the display body 10 of 1st Embodiment is a mode in which light injects into the display body 10 mainly from the surface side, and the display body 10 is observed only from the surface side. Used. For example, the display body 10 is affixed to an opaque surface of an article that hardly reflects light. The display body 10 may be used for the purpose of increasing the difficulty of counterfeiting the article, may be used for the purpose of improving the designability of the article, or may be used for these purposes.

  For the purpose of increasing the difficulty of counterfeiting goods, the display 10 is used for authentication documents such as passports and licenses, securities such as gift certificates and checks, cards such as credit cards and cash cards, banknotes, etc. Is pasted.

  In addition, for the purpose of improving the design of the article, the display body 10 is, for example, a decorative article that can be worn, an article that is carried by the user, an article that is stationary such as furniture or home appliances, a wall or a door. It is attached to the structure etc.

[Action of display body]
With reference to FIG. 4, the image visually recognized when the display area 20 is observed from the direction facing the surface 10F of the display body 10 will be described. In FIG. 4, for ease of understanding, the plasmon structure layer 15 composed of the concavo-convex structure layer 12 and the metal layer 13 is schematically represented as one flat layer, and the multilayer film layer 14 is represented as It is schematically represented as one flat layer.

  When the white light I1 is irradiated from the outside of the display body 10 toward the surface 10F of the display body 10, in the multilayer film layer 14, the light I2 in a predetermined wavelength region reflected by each thin film 14a is strengthened by interference. Thus, the light I2 is emitted to the surface side of the display body 10.

  The multilayer film layer 14 transmits the light I3 in a part of the wavelength range included in the white light I1, and this light I3 enters the plasmon structure layer 15. The concavo-convex structure in the plasmon structure layer 15 is a structure in which a metal thin film is laminated on a dielectric, and the period of the concavo-convex structure is a sub-wavelength period equal to or less than the wavelength in the visible region. Therefore, in the plasmon structure layer 15 that has received the light I3, the generation of the first-order diffracted light is suppressed, and the plasmon resonance in which the light E1 in a specific wavelength region included in the light I3 and the collective vibration of the electrons are coupled. Arise. The plasmon structure layer 15 transmits part of the wavelength band light included in the light I3 as surface plasmon and converts it into light I4 emitted from the plasmon structure layer 15. The wavelength region of the light I4 is determined by the period of the uneven structure, that is, the structure period P. The light emitted from the plasmon structure layer 15 includes light transmitted through the plasmon structure layer 15 by, for example, passing through the structure from a locally thinned portion of the metal layer 13. However, in the light emitted to the back side of the display body 10, the light I4 is dominant.

  As described above, the light I <b> 2 reflected by the multilayer film layer 14 is emitted on the surface side of the display body 10. Therefore, according to the surface reflection observation in which the surface 10F is observed from the surface side of the display body 10 in the state where the white light I1 is irradiated from the outside of the display body 10 toward the surface 10F, the wavelength range of the light I2 is observed. The corresponding hue, that is, the color of the hue corresponding to the wavelength region strengthened by the multilayer film layer 14 is visually recognized in the display region 20. The color corresponding to the wavelength range of the light I2 is different from white and black.

  In the above configuration, since the display body 10 includes the plasmon structure layer 15, the light transmitted through the multilayer film layer 14 is reflected inside the display body 10, for example, at the interface between the base material 11 and the upper layer thereof. By doing so, it is possible to suppress the emission to the surface side of the display body 10. Therefore, since light in a wavelength region different from the light region I2 in the wavelength region intensified by the multilayer film layer 14 is suppressed from being emitted to the surface side of the display body 10, the hue visually recognized in the display region 20 is clear. Is increased.

  As described above, since the wavelength region strengthened by the multilayer film layer 14 in the first display region 20A is different from the wavelength region strengthened by the multilayer film layer 14 in the second display region 20B, in the surface reflection observation, The first display area 20A and the second display area 20B appear to have different hue colors. And since each of the first display area 20 </ b> A and the second display area 20 </ b> B has a sharp hue that is visually recognized, the difference between the hue of the first display area 20 </ b> A and the hue of the second display area 20 </ b> B. Becomes clear, and the visibility of an image such as a pattern expressed by these regions is improved.

  In addition, when the auxiliary region 30 is observed from the direction facing the surface 10F of the display body 10, when the white light I1 is irradiated from the outside of the display body 10 toward the surface 10F, depending on the material of the metal layer 13 The light in the wavelength band is rebounded by the collective movement of free electrons in the metal layer 13. Therefore, the auxiliary region 30 appears to have a metallic luster with a hue corresponding to the wavelength range of the bounced light.

  Accordingly, since the display area 20 and the auxiliary area 30 appear to have different textures, the display body 10 can express various images by the display area 20 and the auxiliary area 30. Note that the light applied to the surface 10F of the display body 10 when observing the display region 20 and the auxiliary region 30 may not be white light.

As described above, according to the first embodiment, the effects listed below can be obtained.
(1) Since the display body 10 includes the plasmon structure layer 15, light transmitted through the multilayer film layer 14 is emitted to the surface side of the display body 10 due to reflection inside the display body 10. Is suppressed. Therefore, since light in a wavelength region different from the light region I2 in the wavelength region intensified by the multilayer film layer 14 is suppressed from being emitted to the surface side of the display body 10, the hue visually recognized in the display region 20 is clear. Is increased.

  (2) The display area 20 includes a first display area 20A and a second display area 20B in which colors of different hues are visually recognized by surface reflection observation. And since each of the first display area 20 </ b> A and the second display area 20 </ b> B has a sharp hue that is visually recognized, the difference between the hue of the first display area 20 </ b> A and the hue of the second display area 20 </ b> B. Becomes clear and the visibility of the image represented by these regions is enhanced. Therefore, in the article provided with the display body 10, the forgery difficulty and the design are further enhanced.

  (3) In the configuration in which the structural period P of the protrusions 12b in the first display area 20A and the structural period P of the protrusions 12b in the second display area 20B are different from each other, the number of layers, the material, and the film thickness of the multilayer film layer 14 Compared to a configuration in which the hue of the first display region 20A and the hue of the second display region 20B are different only by the layer configuration such as the above, the degree of freedom in adjusting the hue in the two regions 20A and 20B is high. Further, in the above configuration, the multilayer film layers in the two regions 20A and 20B are compared with the configuration in which the hue of the first display region 20A and the hue of the second display region 20B are different only by the layer configuration of the multilayer film layer 14. It is also possible to reduce the difference in the 14 layer configurations. Forming the convex portions 12b having different structural periods P in the two regions 20A and 20B is easier than stacking the multilayer film layers 14 having different layer structures in the two regions 20A and 20B. According to the above configuration, the manufacturing process of the display body 10 can be simplified.

  Among them, the multilayer film layer 14 in the first display region 20A and the multilayer film layer 14 in the second display region 20B are one continuous multilayer structure having the same layer configuration, and due to the difference in the structural period P, In the configuration in which the hue of the first display area 20A and the hue of the second display area 20B are different, the display body 10 is particularly easy to manufacture.

  (4) In the configuration in which the display body 10 includes the display area 20 and the auxiliary area 30, the display area 20 and the auxiliary area 30 appear to have different textures in the surface reflection observation. Therefore, the display area 20 and the auxiliary area 30 can be used in various expressions, and the forgery difficulty and the design are further enhanced in the article including the display body 10.

  (5) Since the metal layer 13 included in the display region 20 and the metal layer 13 included in the auxiliary region 30 are one continuous layer, the display body 10 is compared with a configuration in which these layers are separate layers. Is easy to manufacture.

  (6) According to the manufacturing method of forming the plurality of convex portions 12b by pressing the intaglio to the resin coated on the surface of the substrate 11 and curing the resin, thereby forming the concavo-convex structure layer 12 The uneven structure layer 12 having unevenness can be suitably formed.

  (7) When manufacturing the display body 10 in which the structural period P of the convex part 12b in the first display area 20A and the structural period P of the convex part 12b in the second display area 20B are different from each other, According to the manufacturing method in which the convex portion 12b and the convex portion 12b of the second display region 20B are simultaneously formed using the intaglio, the convex portion 12b of the first display region 20A and the convex portion 12b of the second display region 20B are formed. Compared with the manufacturing method formed in another process, the display body 10 can be manufactured efficiently.

(Second Embodiment)
The second embodiment will be described with reference to FIGS. 2nd Embodiment is embodiment of a display body, and the display body 10 of 2nd Embodiment is used in the aspect by which the display body 10 is observed from both the surface side and a back surface side. For example, the display body 10 is attached to the article so that both the front surface and the back surface of the display body 10 are in contact with an air layer or a transparent member. The display body 10 may be used for the purpose of increasing the difficulty of counterfeiting the article, or may be used for the purpose of improving the designability of the article.

[Function of display body: surface reflection observation, back surface transmission observation]
With reference to FIG. 5, when light is incident on the display body 10 from the front surface side, an image that is visually recognized when the display area 20 of the display body 10 is observed from each of the front surface side and the back surface side will be described. . In FIG. 5, for ease of understanding, the plasmon structure layer 15 composed of the concavo-convex structure layer 12 and the metal layer 13 is schematically represented as one flat layer, and the multilayer film layer 14 is represented as It is schematically represented as one flat layer.

  When the white light I1 is emitted from the outside of the display body 10 toward the surface 10F, the surface side of the display body 10 has a wavelength region intensified by the multilayer film layer 14 as in the first embodiment. Light I2 is emitted. Therefore, when the display region 20 is observed from the surface side, the hue color corresponding to the wavelength region of the light I2 is visually recognized in the display region 20.

  As described in the first embodiment, since the display body 10 includes the plasmon structure layer 15, the light transmitted through the multilayer film layer 14 is reflected by the reflection inside the display body 10 or the like. Therefore, the clearness of the hue of the display area 20 as viewed from the surface side is enhanced.

  On the other hand, a part of the wavelength band light E1 included in the light I3 transmitted through the multilayer film layer 14 is consumed by plasmon resonance in the plasmon structure layer 15, and a part of the wavelength band light I4 included in the light I3 is consumed. The light passes through the plasmon structure layer 15 and the base material 11 and is emitted to the back surface side of the display body 10.

  Therefore, when the display area 20 is observed from the back side of the display body 10, the hue color corresponding to the wavelength range of the light I4 is visually recognized in the display area 20. The color corresponding to the wavelength range of the light I4 is white, black, and a color different from the color corresponding to the wavelength range of the light I2. As described above, since the wavelength range of the light I4 emitted from the plasmon structure layer 15 is determined by the structural period P in the concavo-convex structure layer 12, changing the structural period P results in the back surface side of the display body 10. The wavelength range of the light I4 can be changed.

  When the auxiliary region 30 is observed from the surface side of the display body 10, the auxiliary region 30 appears to have a metallic luster with a hue corresponding to the material of the metal layer 13, as in the first embodiment. Further, when the auxiliary region 30 is observed from the back side of the display body 10, the intensity of light transmitted through the auxiliary region 30 out of the light I1 irradiated from the outside of the display body 10 toward the front surface 10F is very small. The auxiliary area 30 is visually recognized as a dark color close to black.

  As described above, according to the surface reflection observation in which the surface 10F is observed from the surface side of the display body 10 in the state where the white light I1 is irradiated from the outside of the display body 10 toward the surface 10F, the first implementation is performed. An image similar to the form is observed.

  On the other hand, according to the back surface transmission observation in which the back surface 10R is observed from the back surface side of the display body in the state where the white light I1 is irradiated from the outside of the display body 10 toward the front surface 10F, A color with a hue different from that of the reflection observation is visually recognized. Further, the first display area 20A and the second display area 20B are visually recognized by the first display area 20A and the second display area 20B in the back surface transmission observation by making the structural period P in the concavo-convex structure layer 12 different. The hue of the color to be made can be made different. According to such a configuration, an image such as a pattern composed of the first display area 20A and the second display area 20B, and further, the first display area 20A, the second display area 20B, and the auxiliary area also by back-surface transmission observation. An image such as a pattern composed of 30 is observed.

  The results of the surface reflection observation and the back surface transmission observation show the same tendency even when the amount of external light directed toward the front surface 10F is higher than the amount of external light directed toward the back surface 10R. Moreover, the light irradiated to the surface 10F of the display body 10 may not be white light.

[Function of display body: surface transmission observation, back surface reflection observation]
With reference to FIG. 6, an image that is visually recognized when the display area 20 of the display body 10 is observed from each of the front surface side and the back surface side when light is incident on the display body 10 from the back surface side will be described. . In FIG. 6, for easy understanding, the plasmon structure layer 15 composed of the concavo-convex structure layer 12 and the metal layer 13 is schematically represented as one flat layer, and the multilayer film layer 14 is represented as It is schematically represented as one flat layer.

  As shown in FIG. 6, when the white light I1 is irradiated from the outside of the display body 10 toward the back surface 10R, the light I1 enters the base material 11 from the air layer and from the base material 11 to the plasmon structure layer 15. to go into.

  Here, the region immediately above the flat portion 12a in the plasmon structure layer 15 is composed of a base portion of the convex portion 12b and a portion of the metal layer 13 laminated on the flat portion 12a between the convex portions 12b. The refractive index of this region is approximated to the averaged size by the refractive index of the base portion of these convex portions 12b and the refractive index of the metal layer 13 between the convex portions 12b. If the volume of the space between the convex portions 12b is larger than the volume of the plurality of convex portions 12b, the refractive index of the region immediately above the flat portion 12a is controlled by the metal layer 13 that is a sea component. And is sufficiently lower than the refractive index of the air layer. Therefore, the light I1 incident on the base material 11 has a lower refractive index than the air layer from the base material 11 having a higher refractive index than the air layer and the flat portion 12a of the concavo-convex structure layer 12. Fresnel reflection is likely to occur at these boundaries.

  On the other hand, when the light I <b> 1 enters the plasmon structure layer 15, plasmon resonance occurs in the plasmon structure layer 15. As a result, the light I5 in a part of the wavelength region included in the light I1 is emitted as reflected light on the back side of the display body 10, and the light E2 in a part of the wavelength region included in the light I1 is consumed by plasmon resonance. The light I6 in a part of the wavelength range included in the light I1 passes through the plasmon structure layer 15. Further, the light I7 in the wavelength region included in the light I6 passes through the multilayer film layer 14 and is emitted to the surface side of the display body 10.

  The wavelength range of the lights I5 and I6 can be adjusted by the structural period P in the concavo-convex structure layer 12. By changing the structural period P, the wavelength range of the light I7 emitted to the surface side of the display body 10 can be changed. . The wavelength range of the light I7 can also be adjusted by the configuration of the thin film 14a in the multilayer film layer 14.

  As described above, according to the surface transmission observation in which the surface 10F is observed from the surface side of the display body in the state where the white light I1 is irradiated from the outside of the display body 10 toward the back surface 10R, the display region 20 Thus, the color of the hue corresponding to the wavelength range of the light I7 is visually recognized. The color corresponding to the wavelength region of the light I7 is different from white and black.

  Further, according to the back surface reflection observation in which the back surface 10R is observed from the back surface side of the display body in a state where the white light I1 is irradiated from the outside of the display body 10 toward the back surface 10R, The hue color corresponding to the wavelength range of I5 is visually recognized. The color according to the wavelength range of the light I5 is white, black, and a color different from the color according to the wavelength range of the light I7. In other words, the display area 20 appears to have a different hue color or to have a different saturation or lightness in the surface transmission observation and the back reflection observation.

  Furthermore, the first display region 20A and the second display region 20B are visually recognized by the first display region 20A and the second display region 20B in the surface transmission observation by making the structural period P in the concavo-convex structure layer 12 different. It is possible to make the hues of the colors to be different, and also in the back surface reflection observation, the hues of the colors visually recognized in the first display area 20A and the second display area 20B can be made different. According to such a configuration, an image such as a pattern composed of the first display region 20A and the second display region 20B is observed in both the front surface transmission observation and the back surface reflection observation.

  Moreover, in the surface transmission observation about the auxiliary region 30, the auxiliary region 30 is visually recognized as a dark color close to black, as in the rear surface transmission observation. In the back surface reflection observation for the auxiliary region 30, the auxiliary region 30 appears to have a metallic luster with a hue corresponding to the material of the metal layer 13, as in the front surface reflection observation. Therefore, an image such as a picture composed of the display area 20 and the auxiliary area 30 is observed in both the front surface transmission observation and the back surface reflection observation.

  Note that the results of the surface transmission observation and the back surface reflection observation show the same tendency even when the amount of external light directed toward the back surface 10R is greater than the amount of external light directed toward the front surface 10F. Moreover, the light irradiated to the back surface 10R of the display body 10 may not be white light.

  In addition, since the reflection of the light I5 and the absorption of the light E2 occur in the plasmon structure layer 15, the display body 10 is irradiated toward the back surface 10R as compared with the configuration in which the plasmon structure layer 15 is not provided. The light transmitted through the display body 10 in the light I1 decreases. Therefore, when the light I1 is irradiated on the front surface 10F and the back surface 10R of the display body 10, the presence of the plasmon structure layer 15 causes the multi-layer film layer 14 in the light I1 irradiated on the front surface 10F. Light other than the reflected light is suppressed from returning to the front surface side, and light included in the light I1 irradiated to the back surface 10R is prevented from passing through the display body 10 and exiting to the front surface side. This also enhances the clearness of the hue visually recognized in the display area 20 during the surface reflection observation.

  FIG. 7 shows the display body 10 attached to the lens of the glasses 90 as a specific example of the display body 10 of the second embodiment. For example, when the front surface 10F of the display body 10 is directed outward and external light hits the spectacles 90, an image obtained by surface reflection observation is visually recognized from the outside of the spectacles 90, and the back surface is transmitted from the inside of the spectacles. The image by observation is visually recognized. The display area 20 of the display body 10 may cover the entire surface of the lens. If the external light is strong, the spectacle outside the spectacles 90 can be visually recognized from the wearer of the spectacles 90 while having a hue corresponding to the wavelength of the light emitted from the back surface 10R of the display body 10.

  As another example, the display body 10 may be attached to a window. When the surface 10F of the display 10 is directed to the outside, for example, in the state in which outside light hits the window during the daytime, an image by surface reflection observation is visually recognized from the outside of the window, and backside transmission observation is performed from the inside of the window. The image by is visually recognized. On the other hand, for example, in a state where the room is lit at night, an image by front surface observation is visually recognized from the outside of the window, and an image by back surface reflection observation is visually recognized from the inside of the window.

As described above, according to the second embodiment, in addition to the effects (1) to (7) of the first embodiment, the following effects can be obtained.
(8) When light is irradiated from the outside of the display body 10 toward the front surface 10F, colors of different hues are visually recognized in the display area 20 by the front surface reflection observation and the rear surface transmission observation. In addition, when light is irradiated from the outside of the display body 10 toward the back surface 10R, colors of different hues are visually recognized in the display region 20 in the front surface transmission observation and the back surface reflection observation. Thus, since the hue of the image visually recognized is different between the case where the display body 10 is observed from the front surface side and the case where the display body 10 is observed from the back surface side, it is difficult to counterfeit or design the article provided with the display body 10. Is further enhanced. Further, the front and back of the display body 10 can be easily identified.

  Furthermore, various images can be expressed by combining the difference in hue between the first display area 20A and the second display area 20B in each observation, the difference in color between the display area 20 and the auxiliary area 30, and the like. In the article provided with the display body 10, the forgery difficulty and the design are further enhanced.

(Third embodiment)
A third embodiment will be described with reference to FIGS. The third embodiment is an embodiment of a device with a display body.
As shown in FIG. 8, the device 100 with a display body includes a display body 10 and a solar cell 50. In the solar cell 50, the light receiving region in the solar cell 50 is disposed at a position facing the back surface 10 </ b> R of the display body 10. For example, the back surface 10 </ b> R of the display body 10 and the light receiving region of the solar cell 50 are in contact with each other. The solar cell 50 generates electric power from the energy of light incident on the light receiving region.

  For example, the display-equipped device 100 is embodied as a timepiece driven by a solar battery, and at this time, the display 10 is used as a dial to enhance the design of the article. For example, as shown in FIG. 9, on the surface 10F of the display body 10, the first display area 20A, the second display area 20B, and the auxiliary area 30 are a pattern for decoration, numbers and characters for time display, and the like. And so on. Some of the numbers, characters, and patterns may be formed by a configuration different from that of the display area 20 and the auxiliary area 30, for example, by applying a resin or metal to the surface 10F.

  Note that the display-equipped device 100 is not limited to a watch, and may be any device that is driven by a solar cell. For example, the solar cell may be driven by a display device or the like. In short, the device 100 with a display body should just have the structure in which the solar cell 50 is located in the back surface side with respect to the display body 10. FIG. Further, the solar cell 50 may face a part of the back surface 10 </ b> R of the display body 10 as long as it faces at least the display area 20.

[Operation of device with display]
With reference to FIG. 10, the aspect of the light traveling on the display-equipped device 100 will be described. In FIG. 10, for ease of understanding, the plasmon structure body layer 15 including the concavo-convex structure layer 12 and the metal layer 13 is schematically illustrated as one flat layer in the display region 20 of the display body 10. The multilayer film layer 14 is schematically represented as one flat layer.

  As shown in FIG. 10, when sunlight I1 is irradiated from the outside of the display-equipped device 100 toward the surface 10F of the display body 10, the display area 20 of the display body 10 is irradiated as in the first embodiment. The light I2 in the wavelength region strengthened by the multilayer film layer 14 is emitted on the surface side. Therefore, when viewed from the surface side of the display body 10, the hue color corresponding to the wavelength region of the light I <b> 2 is visually recognized in the display region 20.

  As described in the first embodiment, since the display body 10 includes the plasmon structure layer 15, the light transmitted through the multilayer film layer 14 is reflected by the reflection inside the display body 10 or the like. Therefore, the clearness of the hue of the display area 20 as viewed from the surface side is enhanced.

  On the other hand, a part of the wavelength band light E1 included in the light I3 transmitted through the multilayer film layer 14 is consumed by plasmon resonance in the plasmon structure layer 15, and a part of the wavelength band light I4 included in the light I3 is consumed. The light passes through the plasmon structure layer 15 and the base material 11 and is emitted to the back surface side of the display body 10. Then, the emitted light I4 enters the light receiving region of the solar cell 50. Thereby, the solar cell 50 generates electric power from the energy of the incident light I4.

  As described above, since the wavelength range of the light I4 emitted from the plasmon structure layer 15 is determined by the structural period P in the concavo-convex structure layer 12, changing the structural period P results in the back surface side of the display body 10. The wavelength range of the light I4 can be changed. Therefore, by adjusting the structural period P, the wavelength region of the light I4 is adjusted to a wavelength region that is efficiently absorbed by the solar cell 50, and the display region 20 exhibits a wavelength region that does not contribute to photoelectric conversion in the solar cell 50. It can also be.

  When the auxiliary region 30 is observed from the surface side of the display body 10, the auxiliary region 30 appears to have a metallic luster with a hue corresponding to the material of the metal layer 13, as in the first embodiment.

  As described above, when the surface 10F is observed from the surface side of the display body 10 in the state where the light I1 is irradiated from the outside of the device 100 with the display body toward the surface 10F of the display body 10, the first embodiment will be described. An image similar to the surface reflection observation is observed. The light I <b> 4 emitted from the back side of the display body 10 is used for power generation by the solar cell 50.

  If you want to add a design to the dial of the watch to enhance its design, if you form the image with a material that does not transmit light, you will be able to express a variety of images because the freedom of material selection will increase. A hole for allowing light to enter the solar cell must be formed in a part of the dial. Increasing the size of these holes increases the amount of light incident on the solar cell and increases the power generation efficiency, but decreases the designability. On the other hand, reducing the size of the hole increases the design but reduces the amount of light incident on the solar cell. As a result, power generation efficiency decreases.

  On the other hand, in the configuration in which the device with a display unit 100 according to the third embodiment is embodied as a watch driven by a solar cell, the display region 20 is used as a region for forming an image, and light is applied to the solar cell. It can also be used as a passing area. Therefore, it is possible to improve both the design properties and the power generation efficiency of the solar cell.

As mentioned above, according to 3rd Embodiment, in addition to the effect of (1)-(7) of 1st Embodiment, the following effects are acquired.
(9) When the surface 10F is observed from the surface side of the display body 10 in a state where light is irradiated from the outside of the display body-equipped device 100 toward the surface 10F of the display body 10, the hue of the hue in the display region 20 is observed. An image with enhanced clarity is visible. Then, light having a predetermined wavelength that is transmitted through the display region 20 and emitted from the back surface side of the display body 10 is used for power generation by the solar cell 50. Therefore, since the display area 20 can be used as an area for forming an image and also used as an area for transmitting light to the solar cell 50, the design of the device with display 100 can be improved and power generation by the solar cell 50. It is possible to achieve both efficiency.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. The fourth embodiment is an embodiment of a device with a display body.
As shown in FIG. 11, the device with a display body 110 includes the display body 10 and a light emission structure 60 configured to emit light. The light emitting structure 60 is a structure that emits light irradiated to the light emitting structure 60 by reflection, or a structure that emits light by light emission of the light emitting structure 60 itself. For example, the light emission structure 60 is a structure that looks white under white light.

  The light emitting structure 60 is disposed at a position facing a part of the back surface 10R of the display body 10, and the light emitting structure 60 and the back surface 10R are separated from each other. That is, when viewed from the direction facing the surface 10 </ b> F of the display body 10, the surface 10 </ b> F includes a region overlapping the light emission structure 60 and a region not overlapping the light emission structure 60. Specifically, the light emission structure 60 is disposed at a position facing a part of the display area 20.

  For example, as shown in FIG. 12, the device 110 with a display body is embodied as a watch in which the display body 10 is a dial and the light emitting structure 60 is a component such as a gear disposed below the dial. Is done. The display-equipped device 110 is not limited to the timepiece, and may have a configuration in which the light emitting structure 60 is disposed on the back surface side with respect to the display body 10.

[Operation of device with display]
With reference to FIG. 13, a description will be given of how light travels on the display-equipped device 110. In FIG. 13, for easy understanding, the plasmon structure layer 15 including the concavo-convex structure layer 12 and the metal layer 13 is schematically illustrated as one flat layer in the display region 20 of the display body 10. The multilayer film layer 14 is schematically represented as one flat layer.

  As shown in FIG. 13, when white light I <b> 1 is irradiated from the outside of the display-equipped device 110 toward the front surface 10 </ b> F of the display body 10, a light emission structure is formed on the back surface side of the display body 10 in the display region 20. In the portion where the body 60 is not disposed, the light I2 in the wavelength region enhanced by the multilayer film layer 14 is emitted to the surface side of the display body 10 as in the first embodiment. Accordingly, when viewed from the surface side of the display body 10, the color of the hue corresponding to the wavelength range of the light I <b> 2 is visually recognized in a portion of the display area 20 that does not overlap with the light emitting structure 60.

  As described in the first embodiment, since the display body 10 includes the plasmon structure layer 15, the light transmitted through the multilayer film layer 14 is reflected by the reflection inside the display body 10 or the like. Therefore, the clearness of the hue that is visually recognized in a portion that does not overlap the light emitting structure 60 in the display region 20 is enhanced.

On the other hand, a part of the wavelength band light E1 included in the light I3 transmitted through the multilayer film layer 14 is consumed by plasmon resonance in the plasmon structure layer 15, and a part of the wavelength band light I4 included in the light I3 is consumed. The light passes through the plasmon structure layer 15 and the base material 11 and is emitted to the back surface side of the display body 10. Then, in a portion where the light emitting structure 60 is located on the back side of the display body 10, light I8 is emitted from the light emitting structure 60 toward the back surface 10 </ b> R of the display body 10. When the light emitting structure 60 is a structure that emits the light emitted to the light emitting structure 60 by reflection, the light I8 is reflected by the light emitting structure 60 from the light I4 emitted from the display body 10. The light may be light, or may be light reflected by the light emitting structure 60 from the light emitted to the light emitting structure 60 from a light source provided in the vicinity of the light emitting structure 60. When the light emitting structure 60 is a structure that emits light by its own light emission, the light I8 is light generated by the light emission of the light emitting structure 60.
When the light I8 is irradiated toward the back surface 10R of the display body 10, the light I8 enters the base material 11 and enters the plasmon structure layer 15 from the base material 11.

  When the light I8 is incident on the plasmon structure layer 15, the light I9 in a part of the wavelength region included in the light I8 is emitted as reflected light to the back side of the display body 10 as in the surface transmission observation of the second embodiment. The light E3 in a part of the wavelength region included in the light I8 is consumed by plasmon resonance, and the light I10 in a part of the wavelength region included in the light I8 passes through the plasmon structure layer 15. Further, the light I11 in the wavelength region included in the light I10 passes through the multilayer film layer 14 and is emitted to the surface side of the display body 10.

  The wavelength range of the lights I9 and I10 can be adjusted by the structural period P in the concavo-convex structure layer 12. By changing the structural period P, the wavelength range of the light I11 emitted to the surface side of the display body 10 can be changed. . The wavelength range of the light I11 can also be adjusted by the configuration of the thin film 14a in the multilayer film layer 14.

  Therefore, when viewed from the front surface side of the display body 10, the color of the hue corresponding to the wavelength range of the light I <b> 2 and the light I <b> 11 is visually recognized in the portion of the display area 20 that overlaps the light emitting structure 60. .

  As a result, when the surface 10F is observed from the surface side of the display body 10 in a state in which the white light I1 is irradiated from the outside of the display-equipped device 100 toward the surface 10F of the display body 10, the display area 20 Thus, the portion overlapping with the light emitting structure 60 and the portion not overlapping with the light emitting structure 60 appear to have different hue colors, or appear to have different saturation and lightness colors. Therefore, an image corresponding to the shape of the light emitting structure 60 is visually recognized, and further, a difference in hue between the first display area 20A and the second display area 20B, a difference in color between the display area 20 and the auxiliary area 30, and the like. Various combinations of images can be used to express various images.

  In addition, the image of the image is displayed so that an image corresponding to the shape of the light emitting structure 60 can be seen or not seen by turning on and off the light irradiation to the light emitting structure 60 and turning on and off the light emission of the light emitting structure 60. The visibility can be adjusted. This also makes it possible to express more diverse images.

As mentioned above, according to 4th Embodiment, in addition to the effect of (1)-(7) of 1st Embodiment, the following effects are acquired.
(10) A part of the light emitted from the light emitting structure 60 passes through the display area 20 of the display body 10 and is emitted to the surface side. Accordingly, when the surface 10F is observed from the surface side of the display body 10 in a state where light is irradiated from the outside of the device with display body 100 toward the surface 10F of the display body 10, a light emission structure is formed in the display region 20. A portion overlapping with the body 60 and a portion not overlapping with the light emitting structure 60 appear to be different colors. Therefore, an image corresponding to the shape of the light emitting structure 60 is visually recognized, and more various images can be expressed, and the forgery difficulty and design of the display-equipped device 110 are further enhanced.

[Modification]
Each of the above embodiments may be modified as follows.
The display area 20 includes the third display area. In the third display area, the structure period P of the uneven structure layer 12 is not constant, and is, for example, 1/10 of the average value of the structure period P in the third display area. The center position of the convex portion 12b viewed from the direction facing the surface 10F may be determined so that the structure period P is distributed with a certain predetermined standard deviation. According to such a configuration, the third display area exhibits different hues in a very small area, and as a whole, in the surface reflection observation, the third display area is visually recognized as a color in which these hues are mixed. Therefore, the third display area can be configured to be visually recognized as a color close to white, and the degree of freedom with respect to the colors of the image formed in the display area 20 is increased.

  The display area 20 may include three or more areas that exhibit different hues. Further, the display area 20 may be an area exhibiting one kind of hue, and even in this case, the display body 10 has the display area 20 with enhanced hue clarity, so It is possible to improve the difficulty of counterfeiting the article and improve the design by combining the combination with a decoration attached to the article.

  The auxiliary region 30 may be a region where the metallic luster is visually recognized when the reflected light is viewed from the surface side of the display body 10, for example, between the metal layer 13 and the base material 11, A flat resin layer continuous with the flat portion 12a may be provided. Alternatively, the auxiliary region 30 may include a metal layer that is a layer different from the metal layer 13 in the display region 20.

  The display body 10 does not need to include the auxiliary region 30 and may be configured only by the display region 20. In addition to the display region 20, for example, the display body 10 includes a base material 11 and a resin layer for surface reflection observation. And may have a region that looks like a color corresponding to the material of the resin layer.

  -3rd Embodiment and 4th Embodiment may be combined. That is, the device with a display body may include the display body 10 and the solar cell 50 and the light emitting structure 60 disposed on the back surface side of the display body.

  D: convex width, H: convex height, I1 to I11, E1 to E3 ... light, P ... structural period, W ... distance between convex parts, 10 ... display body, 10F ... front surface, 10R ... back surface, 11 ... Substrate, 12 ... Uneven structure layer, 12a ... Flat part, 12b ... Convex part, 13 ... Metal layer, 14 ... Multilayer film layer, 14a ... Thin film, 15 ... Plasmon structure layer, 20 ... Display area, 20A ... First Display region, 20B ... second display region, 30 ... auxiliary region, 50 ... solar cell, 60 ... light emitting structure, 100, 110 ... device with display.

Claims (9)

A display body having a front surface and a back surface,
A plurality of protrusions protruding from the surface along the back surface toward the front surface, the plurality of protrusions positioned in a two-dimensional lattice shape having a sub-wavelength period when viewed from a direction facing the surface. An uneven structure layer that is a dielectric,
A metal layer located on the surface side of the concavo-convex structure layer in contact with the concavo-convex structure layer and having a shape following the surface shape of the concavo-convex structure layer;
A multilayer film layer for causing multilayer film interference, the multilayer film layer covering the structure composed of the concavo-convex structure layer and the metal layer located on the surface side with respect to the metal layer;
A display body comprising An area including the uneven structure layer, the metal layer, and the multilayer film layer is a display area,
The display area includes a first display area and a second display area as viewed from the direction facing the surface, and irradiates white light from the outside of the display body toward the surface to illuminate the display body. The display body according to claim 1, wherein in the surface reflection observation observed from the front side, the first display area and the second display area are configured to exhibit colors of different hues. The display body according to claim 2, wherein a period of the protrusions in the first display area and a period of the protrusions in the second display area are different from each other. An area including the uneven structure layer, the metal layer, and the multilayer film layer is a display area,
The display body further includes an auxiliary region including a metal layer as a region different from the display region,
2. In surface reflection observation in which white light is irradiated from the outside of the display body toward the surface to observe the display body from the surface side, the auxiliary region is configured to exhibit a metallic luster. The display body as described in any one of -3. The display body according to claim 4, wherein the metal layer included in the display area and the metal layer included in the auxiliary area are one continuous layer. The display body according to any one of claims 1 to 5,
A solar cell located on the back side of the display body;
A device with a display body. The display body according to any one of claims 1 to 5,
A light emitting structure that is disposed at a position facing a part of the back surface of the display body and configured to emit light toward the back surface of the display body;
A device with a display body. A plurality of convex portions made of the resin are formed by pressing the intaglio on the resin coated on the surface of the base material and curing the resin, thereby forming a sub-view as viewed from the direction facing the surface of the base material. A first step of forming a concavo-convex structure layer comprising the plurality of convex portions located in a two-dimensional lattice shape having a wavelength period;
Forming a metal layer having a shape following the surface shape of the concavo-convex structure layer on the concavo-convex structure layer;
A third step of forming a multilayer film layer that causes multilayer film interference on the structure including the uneven structure layer and the metal layer;
A method of manufacturing a display body including In the display body, a region including the concavo-convex structure layer, the metal layer, and the multilayer film layer is a display region, and the display region is a first display region that is two regions having different periods of the convex portions. And a second display area,
The manufacturing method of the display body according to claim 8, wherein in the first step, the convex portion of the first display region and the convex portion of the second display region are simultaneously formed.