Decorative sheet, display device with decorative sheet, and article with decorative sheet

Abstract

A decorative sheet (20) comprises a substrate (21) having light transmission properties, and a design layer (23) stacked on the substrate (21), wherein the design layer (23) has at least one design element layer (25), each design element layer (25) includes a plurality of dots (26) having the same color, and the number (X) of the design element layers (25) included in the design layer (23) and the maximum dot ratio (Y) (%) in each design element layer (25) satisfy the following relationship.　Y ≤ 99.499 × X(-0.229)

Description

[Technical field]

[0001] The present disclosure relates to a decorative sheet, a display device equipped with a decorative sheet, and an article equipped with a decorative sheet. [Background technology]

[0002] In image display devices such as liquid crystal display devices and organic EL display devices, a display surface having a black color is usually viewed when no image is displayed. Also, a fixed display device having a light-transmitting portion having a desired shape is known. In this fixed display device, light from a backlight arranged on the back side of the light-transmitting portion passes through the light-transmitting portion, and the light-transmitting portion is distinguished from the surrounding members and viewed. As a result, the light-transmitting portion is viewed as a figure, a character, a pattern, or the like. In this fixed display device, too, a display surface having a black color is viewed when the area other than the light-transmitting portion is black and the backlight does not emit light. When the area other than the light-transmitting portion of the fixed display device has a color other than black, the light-transmitting portion is distinguished from the surroundings and viewed as a figure, a character, or the like even when the backlight does not emit light.

[0003] In fields such as automobiles, furniture, and housing construction materials, it is important to improve the design of components that are visually recognized by an observer. In such fields where design improvement is required, image display devices or fixed display devices are required not only to display images, figures, characters, patterns, etc., but also to have a design that harmonizes with the surrounding environment. By disposing a decorative sheet having a design that harmonizes with the surrounding environment on the observer side of the display surface of the display device, it is possible to give these display devices a design that harmonizes with the surrounding environment. A light-transmitting portion composed of a large number of fine holes, etc. is provided in the area of ​​the decorative sheet facing the display surface of the display device. As a result, the images, figures, characters, patterns, etc. displayed on the display device are visually recognized through the decorative sheet.

[0004] JPS64-9777A discloses a decorative display panel having a see-through portion. In this document, a peeling layer portion of a negative image fine pattern is lifted off from a substrate, thereby forming a positive laminated fine pattern consisting of a first colored layer, a concealing layer, and a second colored layer on the substrate, and a see-through portion is formed in the lifted-off portion. JPH2-112895A discloses a window light-shielding material having a fine halftone dot-like light-shielding portion of a desired shape. In this document, a first colored layer, a base concealing layer, and a second colored layer are laminated in this order on a transparent substrate, thereby forming a light-shielding portion. JPH2-112895A discloses an instrument dial that is illuminated from the back side of a character substrate. In this document, the instrument dial has a first printing layer and a halftone dot printing layer. The first printing layer has a small light transmittance. The first printing layer is formed on a transparent plate in an area where a lot of light passes through. The halftone dot printing layer is also formed on the upper surface of the first printing layer.

[0005] For example, a decorative sheet can be manufactured by forming a design layer on a light-transmitting base material and then providing a large number of fine holes in the design layer. The design layer has a predetermined design. The design layer can be formed by printing or the like. The holes are provided by laser processing. The decorative sheet has a light-transmitting portion consisting of holes. In this manufacturing method, all of the holes are formed by laser processing. Therefore, it takes a long time to manufacture the decorative sheet. Furthermore, in this manufacturing method, the processing costs of the decorative sheet are high. DISCLOSURE OF THEINVENTION

[0006] An object of the present disclosure is to provide a decorative sheet, a display device with a decorative sheet, and an article with a decorative sheet that can be manufactured in a short time and at low cost.

[0007] The decorative sheet of the present disclosure is The present invention comprises a light-transmitting substrate and a design layer laminated on the substrate, The design layer has at least one element design layer, Each element design layer includes a plurality of halftone dots having the same color, The number X of the element design layers included in the design layer and the maximum dot rate Y (%) in each element design layer satisfy the following relationship. Y ≦ 99.499 × X (-0.229)

[0008] In the decorative sheet of the present disclosure, The number X of element design layers and the maximum dot rate Y (%) may satisfy the following relationship. 51.2×X (-0.382) ≦ Y

[0009] In the decorative sheet of the present disclosure, The coverage rate of the halftone dots in the design layer may be 50% or more and 99.5% or less.

[0010] In the decorative sheet of the present disclosure, Each element design layer may have a thickness of 2 μm or more and 15 μm or less.

[0011] In the decorative sheet of the present disclosure, When a black plate is placed on the back side of the decorative sheet, the L of light incident from the front side of the decorative sheet and reflected by the black plate is * a * b * L in color space * The value of L * 1, a * The value of a * 1, b * The value of b * 1, and L of light incident from the front surface of the decorative sheet and reflected by the design layer is * a * b * L in color space * The value of L * 2, a * The value of a * 2, b * The value of b * 2, the color difference ΔE is defined by the following formula: * ΔE measured by the SCI method for ab * ΔE measured in ab and SCE methods * Both ab may be 0.7 or more. ΔE * ab=((L * 1-L *2) 2 +(a * 1-a * 2) 2 +(b * 1-b * 2) 2 ) 1 / 2

[0012] In the decorative sheet of the present disclosure, The transmittance of visible light passing through the decorative sheet in the normal direction of the base material may be 0.5% or more and 55% or less.

[0013] In the decorative sheet of the present disclosure, L of light emitted from a D65 light source * a * b * a in color system * The value of a * 3, b * The value of b * 3, and the L of the light emitted from the D65 light source and transmitted through the decorative sheet along the normal direction of the base material. * a * b * a in color system * The value of a * 4, b * The value of b * When set to 4, a * 3, b * 3. a * 4 and b * 4 may satisfy the following relationship: ((a * 3-a * 4) 2 +(b * 3-b * 4) 2 ) 1 / 2 <= 7

[0014] In the decorative sheet of the present disclosure, Sheet resistance is 1×10 6 Ω / □ or more is also acceptable.

[0015] The display device with a decorative sheet according to the present disclosure includes: A display device having a display surface; and the decorative sheet provided facing the display surface.

[0016] In the display device with a decorative sheet according to the present disclosure, The display device may be a dot matrix display.

[0017] The article with the decorative sheet of the present disclosure is The decorative sheet described above, and a resin portion disposed on the opposite side of the base material with respect to the design layer.

[0018] In the article with a decorative sheet according to the present disclosure, The decorative sheet may further include a light source disposed between the decorative sheet and the resin portion.

[0019] In the article with a decorative sheet according to the present disclosure, The light source may be an LED.

[0020] The article with the decorative sheet of the present disclosure is The decorative sheet described above, and a conductive pattern laminated on the decorative sheet.

[0021] [Effects of the invention] According to the present disclosure, it is possible to provide a decorative sheet, a display device with a decorative sheet, and an article with a decorative sheet, which can be manufactured in a short time and at low cost. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram for explaining the first embodiment of the present disclosure, and is a perspective view that generally illustrates a display device with a decorative sheet in which a decorative sheet is incorporated. [Diagram 2] FIG. 2 is a partial cross-sectional view showing a cross section of the decorative sheet. [Diagram 3] FIG. 3 is a partial plan view showing a first element design layer of the design layer of the decorative sheet. [Figure 4] FIG. 4 is a partial plan view showing the second element design layer of the design layer. [Diagram 5] FIG. 5 is a partial plan view showing the third element design layer of the design layer. [Figure 6] FIG. 6 is a partial plan view showing a fourth element design layer of the design layer. [Figure 7] FIG. 7 is a partial plan view showing a design layer formed by superimposing the element design layers of FIGS. [Figure 8] FIG. 8 is a diagram for explaining a method of calculating the halftone dot rate. [Figure 9] FIG. 9 is a diagram for explaining a method of calculating the halftone dot rate. [Figure 10] FIG. 10 is a diagram for explaining an example of a method for adjusting the maximum dot rate. [Figure 11] FIG. 11 is a diagram for explaining another example of the method for adjusting the maximum dot rate. [Figure 12] FIG. 12 is a partial cross-sectional view that shows a schematic view of how light incident from the front surface of the decorative sheet is reflected when a black plate is placed on the rear surface side of the decorative sheet. [Figure 13] FIG. 13 is a partial cross-sectional view that shows a schematic view of how light emitted from a D65 light source passes through a decorative sheet. [Figure 14] FIG. 14 is a partial cross-sectional view showing a modified example of the decorative sheet. [Figure 15] FIG. 15 is a partial cross-sectional view showing another modified example of the decorative sheet. [Figure 16] FIG. 16 is a diagram for explaining the second embodiment of the present disclosure, and is a cross-sectional view showing an example of an electronic device with a decorative sheet in which a decorative sheet is incorporated. [Figure 17] FIG. 17 is a plan view showing the electronic device with the decorative sheet of FIG. [Figure 18] FIG. 18 is a plan view showing the electronic device with the decorative sheet of FIG. [Figure 19] FIG. 19 is a diagram for explaining an example of a method for manufacturing a display device with a decorative sheet for an electronic device with a decorative sheet. [Figure 20] FIG. 20 is a plan view showing the decorative sheet of the display device with the decorative sheet of FIG. [Figure 21] FIG. 21 is a diagram for explaining an example of a method for manufacturing a display device equipped with a decorative sheet. [Figure 22] FIG. 22 is a plan view showing a pattern layer of a display device with a decorative sheet. [Figure 23] FIG. 23 is a diagram illustrating an example of a method for manufacturing a display device equipped with a decorative sheet. [Figure 24] FIG. 24 is a diagram illustrating an example of a method for manufacturing a display device equipped with a decorative sheet. [Diagram 25] FIG. 25 is a diagram illustrating an example of a method for manufacturing a display device equipped with a decorative sheet. [Figure 26] FIG. 26 is a diagram illustrating an example of a method for manufacturing a display device equipped with a decorative sheet. [Figure 27] FIG. 27 is a diagram illustrating an example of a method for manufacturing a display device equipped with a decorative sheet. [Figure 28] FIG. 28 is a cross-sectional view showing a modified example of a display device with a decorative sheet. [Figure 29] FIG. 29 is a cross-sectional view showing another modified example of a display device with a decorative sheet. [Diagram 30] FIG. 30 is a cross-sectional view showing still another modified example of a display device with a decorative sheet. [Diagram 31] FIG. 31 is a plan view showing the display device with the decorative sheet of FIG. [Diagram 32] FIG. 32 is a plan view showing an example of a conductive pattern in an article with a decorative sheet. [Diagram 33] FIG. 33 is a plan view showing another example of the conductive pattern. [Diagram 34] FIG. 34 is a plan view showing still another example of the conductive pattern. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings attached to this specification, the scale and the aspect ratio are changed and exaggerated from those of the actual objects in order to make the drawings easier to understand. Note that the embodiments shown below are examples of the embodiments of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to these embodiments.

[0024] In this specification, the terms "plate," "sheet," and "film" are not distinguished from one another solely based on differences in name. For example, "sheet" includes members called "plate" or "film."

[0025] Additionally, the term "plate surface (sheet surface, film surface)" refers to a surface that coincides with the extension direction of the target plate-like (sheet-like, film-like) member when the target plate-like (sheet-like, film-like) member is viewed overall and in a global perspective. Additionally, the normal direction used for a plate-like (sheet-like, film-like) member refers to the direction in which the normal to the plate surface (sheet surface, film surface) of the member extends.

[0026] In this specification, "planar view" refers to a state in which a symmetrical plate-like (sheet-like, film-like) member is viewed from the normal direction of the member. For example, when a certain plate-like member "has a rectangular shape in a planar view," it means that the member has a rectangular shape when viewed from the normal direction to the plate surface.

[0027] Terms used in this specification that specify shapes, geometric conditions, and physical characteristics and their degrees, such as "parallel," "orthogonal," and "same," as well as ranges of lengths, angles, and values ​​of physical characteristics, are not strictly limited to the ranges, but include ranges within which similar functions can be expected, unless otherwise specified to be interpreted strictly.

[0028] First embodiment In the first embodiment, a decorative sheet that is disposed on the observer side of the display surface of a video display device such as a liquid crystal display device and an organic EL display device will be described as an example. However, without being limited to such applications, the decorative sheet of the present disclosure may be used as a decorative sheet that is disposed on the observer side of the display surface of a fixed display device, or may be used for various other purposes. The fixed display device has a light-transmitting portion disposed on the observer side of the backlight. The light-transmitting portion has a desired shape. In the fixed display device, light from the backlight passes through the light-transmitting portion. As a result, the light-transmitting portion is distinguished from the surroundings and is visually recognized as a pattern such as a figure or a character.

[0029] 1 to 15 are diagrams illustrating a first embodiment according to the present disclosure. Fig. 1 is a perspective view that shows a schematic view of a display device 10 with a decorative sheet 20 incorporated therein. Fig. 2 is a partial cross-sectional view showing a cross section of the decorative sheet 20.

[0030] The display device 10 with a decorative sheet of this embodiment includes a display device 15 and a decorative sheet 20. The decorative sheet 20 is disposed facing the display surface 17 of the display device 15. The display device 15 of this embodiment is, for example, a dot-matrix display. The dot-matrix display is, for example, a liquid crystal display (LCD), an organic electroluminescence display (OLED), a micro LED display, a quantum dot (QD) display, or the like. The display surface 17 includes a display area 17A and a non-display area 17B. The display area 17A is an area where images such as moving images and still images are displayed. The non-display area 17B is an area where no images are displayed. In the example shown in FIG. 1, in a plan view of the display surface 17, the display area 17A has a rectangular outline. The non-display area 17B has a frame-like shape surrounding the display area 17A. The display device 10 with a decorative sheet has a light-emitting surface 10a. The light exit surface 10a is a surface through which image light L , which is emitted from the display device 15 and passes through the decorative sheet 20 to be visually recognized by the observer 5, is emitted. iIn the illustrated example, the decorative sheet 20 constitutes the light exit surface 10a. However, this is not limited thereto, and a transparent protective layer or the like may be further provided on the viewer 5 side of the decorative sheet 20, and the protective layer or the like may constitute the light exit surface 10a of the display device 10 with the decorative sheet.

[0031] The decorative sheet 20 is disposed on the viewer 5 side of the display device 15. The decorative sheet 20 imparts design to the display device 15. In particular, the decorative sheet 20 imparts design to the display device 15 that harmonizes with the surrounding environment. In the example shown in FIG. 1, the decorative sheet 20 is disposed so as to cover the display area 17A and the non-display area 17B of the display surface 17. However, the decorative sheet 20 may be disposed so as to cover only the display area 17A of the display surface 17. The decorative sheet 20 is provided with a predetermined design that is observed from the viewer 5 side. When the image light L from the display device 15 is incident on the display surface 17A, the decorative sheet 20 is provided with a predetermined design that is observed from the viewer 5 side. i When the image light L emitted from the display device 15 is not emitted, the design is visually recognized by the observer 5. The decorative sheet 20 also has a light-transmitting portion 27, which will be described later. The light-transmitting portion 27 transmits the image light L emitted from the display device 15. i The image light L is transmitted from the display device 15 to the observer 5. i When the image light L is emitted, i passes through the light transmitting portion 27 of the decorative sheet 20 and is emitted from the light exit surface 10a. i is visually recognized by the observer 5. Therefore, the image light L i The display device 10 with the decorative sheet has different appearances depending on whether the light is emitted or not.

[0032] The decorative sheet 20 includes a base material 21 and a design layer 23. The base material 21 is light-transmitting. The design layer 23 is laminated on the base material 21. In the example shown in FIG. 2, the decorative sheet 20 includes a covering layer 28. The covering layer 28 covers the base material 21 and the design layer 23 from the viewer 5 side. The decorative sheet 20 includes a first surface 20a and a second surface 20b. The first surface 20a faces the viewer side. The second surface 20b faces the opposite side to the first surface 20a (the display device 15 side). In the illustrated example, the first surface 20a of the decorative sheet 20 is the light-emitting surface 10a of the display device 10 with the decorative sheet.

[0033] The substrate 21 is a member that supports the design layer 23. The substrate 21 has a first surface 21a and a second surface 21b. The first surface 21a faces the viewer 5. The second surface 21b faces the opposite side to the first surface 21a (the display device 15 side). In the example shown in FIG. 2, the design layer 23 is provided on the first surface 21a of the substrate 21. In the illustrated example, the image light L emitted from the display device 15 is i The substrate 21 is a transparent substrate so as not to impede the transmission of light. The substrate 21 preferably has a transmittance of 80% or more in visible light. The substrate 21 more preferably has a transmittance of 84% or more in visible light. In this specification, the transmittance of visible light is the average value of the transmittance at each wavelength when an integrating sphere unit "ISN-723" is attached to a spectrophotometer "V-670" manufactured by JASCO Corporation and the light transmittance in all directions is measured using this spectrophotometer in a wavelength range of 380 nm to 780 nm.

[0034] The substrate 21 preferably has a light reflectance of 20% or less in the visible light range. More preferably, the substrate 21 has a light reflectance of 16% or less in the visible light range. The light reflectance may be measured using a spectrophotometer "CM-700d" manufactured by Konica Minolta.

[0035] The substrate 21 may be a plate, sheet or film made of, for example, glass or resin. As the resin film, various resin films used as substrates for optical members may be suitably used. For example, acrylic resin, ABS resin, polymethylmethacrylate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, and cyclic polyolefin may be used as the material of the substrate 21. The substrate 21 may have one layer of resin film. The substrate 21 may have two or more layers of resin film. The thickness of the substrate 21 may be, for example, 50 μm or more and 500 μm or less. In the illustrated example, the second surface 21b of the substrate 21 is the second surface 20b of the decorative sheet 20.

[0036] The covering layer 28 covers and protects the base material 21 and the design layer 23 from the viewer 5 side. In the illustrated example, the surface of the covering layer 28 facing the viewer 5 side is the first surface 20a of the decorative sheet 20. In the example shown in FIG. 2, the image light L i The covering layer 28 is a transparent member so as not to impede the transmission of light. The covering layer 28 preferably has a transmittance of 80% or more in visible light. The covering layer 28 more preferably has a transmittance of 84% or more in visible light. The covering layer 28 may be formed by adhering a glass or resin film onto the substrate 21 (first surface 21a) and the design layer 23. The covering layer 28 may also be formed by applying and curing a resin material having fluidity. As the resin material for forming the covering layer 28, various resin materials used as optical members may be suitably used. As an example, the material for the covering layer 28 may be the same resin material as the resin material constituting the substrate 21.

[0037] The design layer 23 is configured to receive the image light L from the display device 15. i The design layer 23 displays a design that is visually recognized by the observer 5 when no light is emitted. The design is, for example, a picture, a photograph, a figure, a pattern, a mark, a character, a color, or other pattern. The design may be a design that can be harmonized with the surrounding environment of the place where the display device 15 is installed. As such a design, a pattern having an appearance similar to that of wood or marble may be used. The design layer 23 may also have a monochromatic color pattern.

[0038] The design layer 23 has at least one element design layer 25. One element design layer 25 displays a single-color element design. In this embodiment, each element design layer 25 includes multiple halftone dots 26 having the same color. In each element design layer 25, the element design is displayed as a collection of halftone dots 26. When the design layer 23 includes multiple element design layers 25, each element design layer 25 displays an element design having a different color from each other. In this case, the multiple element design layers 25 are superimposed to form a design to be displayed by the design layer 23. In other words, each element design is a design in which the design to be displayed by the design layer 23 is decomposed by color. The design layer 23 of this embodiment includes four element design layers 25 (251 to 254). The first element design layer 251 displays an element design having black (BK). The second element design layer 252 displays an element design having blue (C). The third element design layer 253 displays an element design having a red color (M). The fourth element design layer 254 displays an element design having a yellow color (Y). That is, the first element design layer 251 is composed of a collection of halftone dots 26 having a black color. The second element design layer 252 is composed of a collection of halftone dots 26 having a blue color. The third element design layer 253 is composed of a collection of halftone dots 26 having a red color. The fourth element design layer 254 is composed of a collection of halftone dots 26 having a yellow color. The specific configuration of the element design layers 25 is determined arbitrarily. The specific configuration is, for example, the number of element design layers 25, the color displayed by each element design layer 25, and the order in which multiple element design layers 25 are superimposed.

[0039] FIG. 3 is a partial plan view showing the first element design layer 251 (25). FIG. 4 is a partial plan view showing the second element design layer 252 (25). FIG. 5 is a partial plan view showing the third element design layer 253 (25). FIG. 6 is a partial plan view showing the fourth element design layer 254 (25). In each element design layer 25, the halftone dots 26 are composed of fine dot-like colored areas. In the illustrated example, the halftone dots 26 have a contour having a circular shape in a plan view. The diameter of the halftone dots 26 may be, for example, 72 μm or more and 365 μm or less. Preferably, the diameter of the halftone dots 26 may be 72 μm or more and 270 μm or less. In one element design layer 25, each halftone dot 26 may have the same area (diameter) or different areas (diameters). Such halftone dots 26 can be formed on the base material 21 using a printing technique such as screen printing.

[0040] The halftone dots 26 are arranged, for example, using an AM screen. When an AM screen is used, the multiple halftone dots 26 are arranged regularly along a predetermined arrangement direction. For example, the multiple halftone dots 26 are arranged on each intersection of a predetermined virtual lattice. In this case, the shading in the element design displayed by the element design layer 25 is expressed by the size of the area (diameter) of the halftone dots 26. In the example shown in Figures 3 to 7, each halftone dot 26 is arranged regularly using an AM screen. The resolution of the halftone dots 26 in the element design layer 25 may be, for example, 70 dpi or more and 150 dpi or less. As described above, the area (diameter) of the halftone dots 26 actually changes depending on the shading in the element design displayed by the element design layer 25. In Figures 3 to 7, for ease of understanding, each halftone dot 26 is shown to have the same area (diameter).

[0041] When an AM screen is used to arrange the dots 26 and multiple element design layers 25 are laminated with the dots 26 aligned in the same direction, a slight positional shift may occur between the element design layers 25, resulting in moire. Therefore, multiple element design layers 25 may be laminated with the dots 26 arranged in different directions between the element design layers 25. The arrangement direction D1 of the dots 26 in the first element design layer 251 is used as a reference. In the example shown in Figures 3 to 7, the first element design layer 251 to the fourth element design layer 254 are laminated so that the arrangement directions D2 to D4 of the dots 26 in the second element design layer 252 to the fourth element design layer 254 and the arrangement direction D1 have a predetermined angle θ. In the illustrated example, the arrangement direction D2 of the dots 26 in the second element design layer 252 has an angle θ of 15 degrees counterclockwise with respect to the arrangement direction D1. The arrangement direction D3 of the dots 26 of the third element design layer 253 has an angle θ of 45 degrees counterclockwise with respect to the arrangement direction D1. The arrangement direction D4 of the dots 26 of the fourth element design layer 254 has an angle θ of 75 degrees counterclockwise with respect to the arrangement direction D1.

[0042] FIG. 7 shows a partial plan view of the design layer 23 formed by overlapping the first element design layer 251 to the fourth element design layer 254. FIG. 7 shows the first element design layer 251 to the fourth element design layer 254 overlapped in order on the substrate 21, as viewed from the fourth element design layer 254 side (observer 5 side). In the illustrated example, the element design layers 251 to 254 are arranged so that the arrangement directions D1 to D4 of the halftone dots 26 have a predetermined angle with each other. Therefore, even if a slight positional deviation occurs between the element design layers 251 to 254, the occurrence of moire caused by this positional deviation is suppressed.

[0043] In the decorative sheet 20 of this embodiment, the number X of element design layers 25 included in the design layer 23 and the maximum dot rate Y (%) in each element design layer 25 (251 to 254) satisfy the following relationship. Y ≦ 99.499 × X (-0.229) ...(Formula 1) X is a natural number. For example, when the number X of the element design layers 25 included in the design layer 23 is 4, the maximum dot rate Y in each element design layer 25 is about 72.4% or less.

[0044] In this specification, the dot ratio of a layer (e.g., element design layer 25) is the ratio of the area occupied by the dots 26 located in a specific area of ​​the layer in a plan view of the layer, expressed as a percentage. The maximum dot ratio Y is the largest dot ratio among the dot ratios of each area of ​​the layer. Therefore, for example, when the maximum dot ratio Y in the element design layer 25 is 60%, the dot ratio in all areas in the element design layer 25 is 60% or less. In other words, when the maximum dot ratio Y in the element design layer 25 is 60%, there is no area in the element design layer 25 with a dot ratio exceeding 60%.

[0045] In addition, the maximum dot rate Y in each element design layer 25 satisfies the above formula 1 means that the maximum dot rate Y in all element design layers 25 satisfies the above formula 1. The case where the design layer 23 includes the first element design layer 251 to the fourth element design layer 254 will be described below. In this case, the number X of element design layers 25 included in the design layer 23 is 4. In this case, the maximum dot rate Y in the first element design layer 251, the maximum dot rate Y in the second element design layer 252, the maximum dot rate Y in the third element design layer 253, and the maximum dot rate Y in the fourth element design layer 254 all satisfy the above formula 1.

[0046] The largest of the maximum dot rate Y in the first element design layer 251, the maximum dot rate Y in the second element design layer 252, the maximum dot rate Y in the third element design layer 253, and the maximum dot rate Y in the fourth element design layer 254 is defined as Y max That is, the largest maximum dot rate Y among the maximum dot rates Y in all element design layers 25 is set as Y max Let Y max satisfies the following formula 1-2, the maximum dot rate Y in each element design layer 25 satisfies the above formula 1. Y max ≦ 99.499×X (-0.229) ...(Formula 1-2)

[0047] In other words, the maximum dot rate Y in each element design layer 25 satisfies the above formula 1 when the maximum dot rate Y in each element design layer 25 is the largest max This is the same as satisfying the above formula 1-2.

[0048] Preferably, the number X of element design layers 25 included in the design layer 23 and the maximum dot rate Y (%) in each element design layer 25 (251 to 254) satisfy the following relationship. Y ≦ 95.7 × X (-0.243) ...(Formula 1-3) For example, when the number X of element design layers 25 included in the design layer 23 is 4, the maximum dot rate Y in each element design layer 25 is approximately 68.3% or less.

[0049] In addition, preferably, the maximum dot rate Y is the largest among the maximum dot rates Y in all the element design layers 25. max satisfies the following relationship: Y max ≦ 95.7×X (-0.243) ...(Formula 1-4)

[0050] When the number X of element design layers 25 included in the design layer 23 is large, the coverage rate of the halftone dots 26 in the entire design layer 23 is large. The coverage rate of the halftone dots 26 in the entire design layer 23 after the multiple element design layers 25 are superimposed may be 99.5% or less. As a result, the image light L emitted from the display device 15 i is visually recognized well by the observer 5. In this embodiment, when the number X of the element design layers 25 included in the design layer 23 is large, the maximum dot rate Y in one element design layer 25 is small. For example, when the number X of the element design layers 25 and the maximum dot rate Y in each element design layer 25 satisfy the above formula 1, or when the maximum dot rate Y is the largest of the maximum dot rates Y max When the above formula 1-2 is satisfied, the coverage of the dots 26 in the design layer 23 after the element design layers 25 are superimposed does not greatly exceed 99.5%. Therefore, the area of ​​the light transmitting portion 27 in the design layer 23 can be sufficiently secured.

[0051] Preferably, the coverage of the dots 26 in the entire design layer 23 after the multiple element design layers 25 are superimposed may be 95% or less. i is more clearly visible to the observer 5. For example, when the number X of the element design layers 25 and the maximum dot rate Y in each element design layer 25 satisfy the above formula 1-3, or when the maximum dot rate Y is the largest of the maximum dot rates Y max When the above formula 1-4 is satisfied, the coverage rate of the dots 26 in the design layer 23 after the element design layers 25 are superimposed does not greatly exceed 95%. Therefore, the area of ​​the light transmitting portion 27 in the design layer 23 can be further sufficiently secured.

[0052] The visible light transmittance of the halftone dots 26 may be 0% or more and 30% or less. Preferably, the visible light transmittance of the halftone dots 26 may be 10% or more and 25% or less. Here, the visible light transmittance of the halftone dots 26 is the transmittance of one layer of halftone dots 26. In this way, the visible light transmittance of the halftone dots 26 is relatively small. In this case, the maximum halftone dot rate Y in each element design layer 25 satisfies the above formula 1, or the maximum halftone dot rate Y, which is the largest among the maximum halftone dot rates Y, is set to 0% or more and 30% or less. max By satisfying the above formula 1-2, it is possible to ensure a sufficient area of ​​the light transmitting portion 27. As a result, the image light L emitted from the display device 15 and transmitted to the viewer 5 side through the light transmitting portion 27 can be i A sufficient amount of water can be secured.

[0053] Table 1 shows the evaluation of the decorative sheet 20 when the number X of element design layers 25 included in the design layer 23 and the maximum dot rate Y in each element design layer 25 are changed for multiple samples of the decorative sheet 20. In Table 1, "sample number" is a serial number given to each sample. "Number of element design layers X" is the number X of element design layers 25 included in the design layer 23 of each sample. "Maximum dot rate Y (%)" is the maximum dot rate Y (%) in each element design layer 25. "Coverage rate (%)" is the coverage rate (%) of the dots 26 in the design layer 23. "Transmittance (%)" is the transmittance (%) of visible light transmitted through each sample. "Evaluation" is the evaluation of each sample. The visible light transmittance of the display device 10 with the decorative sheet (simply referred to as "display device" in Table 1) in which the decorative sheet 20 of each sample was incorporated and the color reflectance of the decorative sheet 20 were evaluated visually.

[0054] Each element design layer 25 constituting the design layer 23 has a different color. The color of the first element design layer 25 is yellow. The color of the second element design layer 25 is blue. The color of the third element design layer 25 is red. The color of the fourth element design layer 25 is brown. The color of the fifth element design layer 25 is skin color. The color of the sixth element design layer 25 is black. Therefore, for example, in samples 9 to 12 in which the "number of element design layers X" is 3, the design layer 23 has an element design layer 25 having a yellow color, an element design layer 25 having a blue color, and an element design layer 25 having a red color. The thickness of each element design layer 25 is 15 μm.

[0055] [Table 1]

[0056] The details of the evaluation in the "Evaluation" column of Table 1 are as follows: A+: Both the transmittance of the display device and the color transmittance of the decorative sheet are very favorable. A: Both the transmittance of the display device and the transmittance of the color of the decorative sheet are preferable. B: The transmittance of the display device is somewhat poor, but overall is favorable. The pattern layer is not visible through the decorative sheet. C: The color reflectance of the decorative sheet is somewhat poor, but is acceptable for practical use. D: Poor transmittance.

[0057] According to the study by the inventors of the present invention, as shown in Table 1, when the design layer 23 includes two element design layers 25 (X=2) in which the colors and arrangements of the dots 26 are different from each other and the maximum dot ratio Y is 83.5%, the coverage of the dots 26 in the design layer 23 is about 99.4%. i The necessary transmittance was ensured to allow the observer 5 to visually recognize the dots 26. Similarly, when the design layer 23 includes one element design layer 25 (X=1) having a maximum dot rate Y of 99.5%, the coverage of the dots 26 in the design layer 23 is 99.4%. When the design layer 23 includes three element design layers 25 (X=3) having a maximum dot rate Y of 78.5%, the coverage of the dots 26 in the design layer 23 is approximately 99.4%. When the design layer 23 includes four element design layers 25 (X=4) having a maximum dot rate Y of 74%, the coverage of the dots 26 in the design layer 23 is approximately 99.4%. When the design layer 23 includes five element design layers 25 (X=5) having a maximum dot rate Y of 68.5%, the coverage of the dots 26 in the design layer 23 is approximately 99.4%. When the design layer 23 includes six element design layers 25 (X=6) having a maximum dot ratio Y of 65%, the coverage of the dots 26 in the design layer 23 is approximately 99.4%. The above formula 1 is an approximation based on these data.

[0058] In addition, when the design layer 23 includes two element design layers 25 (X=2) in which the colors and arrangements of the dots 26 are different from each other and the maximum dot ratio Y is 80%, the coverage of the dots 26 in the design layer 23 is about 95%. iThe transmittance required for allowing the observer 5 to visually recognize the dots 26 was sufficiently secured. Similarly, when the design layer 23 includes one element design layer 25 (X=1) having a maximum dot rate Y of 95%, the coverage of the dots 26 in the design layer 23 is 95%. When the design layer 23 includes three element design layers 25 (X=3) having a maximum dot rate Y of 75%, the coverage of the dots 26 in the design layer 23 is approximately 95%. When the design layer 23 includes four element design layers 25 (X=4) having a maximum dot rate Y of 70%, the coverage of the dots 26 in the design layer 23 is approximately 95%. When the design layer 23 includes five element design layers 25 (X=5) having a maximum dot rate Y of 65%, the coverage of the dots 26 in the design layer 23 is approximately 95%. When the design layer 23 includes six element design layers 25 (X=6) having a maximum dot ratio Y of 60%, the coverage of the dots 26 in the design layer 23 is approximately 95%. The above formulas 1-3 are approximations based on these data.

[0059] The maximum dot ratio Y in the element design layer 25 is measured as follows. The element design layer 25 is photographed using a Keyence digital microscope "VH-5500." In the photographed image, the coverage of the dots 26 in a square area with a side length of 1 mm is calculated. The coverage of the dots 26 calculated in the area with the largest coverage by the dots 26 is the maximum dot ratio Y in the element design layer 25.

[0060] An example of a method for calculating the dot rate in each element design layer 25 will be described. Figs. 8 and 9 are diagrams for explaining the method for calculating the dot rate. Fig. 8 is a diagram for explaining a method for calculating the dot rate when the arrangement pitch a of the dots 26 is equal to or greater than the diameter b of the dots 26, and Fig. 9 is a diagram for explaining a method for calculating the dot rate when the arrangement pitch a of the dots 26 is smaller than the diameter b of the dots 26. Consider now a unit section 50 whose vertex is the center of four dots 26. As shown in Figs. 8 and 9, the unit section 50 has a square outline. The length of one side of the unit section 50 is a. Therefore, the area of ​​the unit section 50 is a 2 It is.

[0061] In the example shown in FIG. 8, the area of ​​the region covered by the halftone dot 26 having a diameter b in the unit block 50 is π×(b / 2) 2 Therefore, the halftone dot ratio in this case can be expressed by the following formula: (Dot ratio) = (π × b 2 ) / (4×a 2 )...(Formula 2)

[0062] In the example shown in FIG. 9, A is one side of the unit block 50. P is the point where the contours of two halftone dots 26, each having a center at both ends of side A, intersect with each other. γ (rad) is the angle between side A and a straight line B connecting one end O of side A to point P. The area of ​​the region covered by halftone dots 26 having a diameter b within the unit block 50 is calculated as π×(b / 2) 2 The area S1 can be calculated by subtracting four times the area S1 of the overlapping portion of two adjacent halftone dots 26 from the area S1. The area S1 can be calculated as follows. S1 = (π × (b / 2) 2 ×arccos(a / b) / (2×π)-(1 / 2)×(a / 2)×(b / 2)×sinγ)×2 Therefore, S1=(b / 4)×(b×arccos(a / b)-a×sinγ) The dot ratio can be expressed by the following formula: (Dot ratio) = (π × (b / 2) 2 -4×S1) / a 2 Finally, the dot ratio can be expressed by the following formula: (Dot ratio)=(b 2 / a 2 )×((π / 4)-arccos(a / b))+(b / a)×sinγ...(Equation 3)

[0063] The arrangement pitch a of the dots 26 and the diameter b of the dots 26 can be measured using a digital microscope "VH-5500" manufactured by Keyence Corporation.

[0064] FIG. 10 is a diagram for explaining an example of a method for adjusting the maximum dot rate Y. FIG. 11 is a diagram for explaining another example of a method for adjusting the maximum dot rate Y. Here, an example will be described in which the number X of element design layers 25 included in the design layer 23 is 4, and the maximum dot rate Y of each element design layer 25 is 60%. In FIG. 10 and FIG. 11, the dot rate of each part of the dot image before the adjustment of the maximum dot rate Y is the horizontal axis. The dot rate of each part of the dot image after the adjustment of the maximum dot rate Y is the vertical axis. In addition, in FIG. 10 and FIG. 11, the dot rate of the dot image before the adjustment of the maximum dot rate Y is shown by a dashed line, and the dot rate of the dot image after the adjustment of the maximum dot rate Y is shown by a solid line. In order to make the maximum dot rate Y of each element design layer 25 60%, for example, the following may be performed. First, a predetermined color image that is to be the design displayed by the design layer 23 is decomposed into four-color images. The four-color images are superimposed to become the color image. The four color images include a black (BK) image, a blue (C) image, a red (M) image, and a yellow (Y) image. Next, each color image is converted into a halftone image so that the halftone dot rate in the image is 0% to 100%. After that, as shown in FIG. 10, the halftone dot rate of the part exceeding 60% is adjusted to 60%. This allows the creation of a halftone dot image that constitutes the element design of each element design layer 25.

[0065] As another example, a halftone image forming an element design of each element design layer 25 may be created as follows. First, a predetermined color image to be the design displayed by the design layer 23 is decomposed into four-color images. The four-color images are superimposed to form the color image. The four-color images include a black (BK) image, a blue (C) image, a red (M) image, and a yellow (Y) image. Next, each color image is converted into a halftone image so that the halftone rate in the image is 0% to 100%. After that, as shown in FIG. 11, the halftone rate of the entire halftone image is reduced so that the halftone rate of the part that was 100% before the adjustment becomes 60%. As a result, each color halftone image is converted into a halftone image such that the halftone rate of the entire halftone image is 0% to 60%.

[0066] When the design layer 23 has multiple element design layers 25 superimposed on each other, the design layer 23 has an area (light-transmitting portion 27) where no halftone dots 26 exist along the normal direction. As a result, light incident from the second surface 20b of the decorative sheet 20 passes through the light-transmitting portion 27 in the design layer 23 and exits from the first surface 20a. In the decorative sheet 20 of this embodiment, the number X of element design layers 25 included in the design layer 23 and the maximum halftone dot rate Y (%) in each element design layer 25 (251 to 254) satisfy the above-mentioned formula 1. As a result, the area of ​​the light-transmitting portion 27 in the design layer 23 can be sufficiently secured. Therefore, the image light L exiting from the display device 15 and exiting toward the viewer 5 side through the light-transmitting portion 27 of the design layer 23 is 100%. i That is, the amount of image light L from the display device 15 can be sufficiently secured. i When the image light L i is clearly visible to the observer 5.

[0067] Moreover, the halftone dots 26 are formed on the base material 21 using a printing technique such as screen printing. Therefore, there is no need to use laser processing, which requires a long processing time and high processing costs, to provide the light-transmitting portion 27 in the design layer 23. Furthermore, by forming the design displayed by the design layer 23 with the halftone dots 26, there is no need to align each element design layer 25 with high precision. This allows the decorative sheet 20 to be manufactured in a short time and at low cost.

[0068] Furthermore, by forming the design displayed by the design layer 23 with halftone dots 26, the degree of freedom in arranging each color represented by the halftone dots 26 is increased. Furthermore, by forming the design displayed by the design layer 23 with halftone dots 26, the reproducibility of colors and shades is increased. Also, the light-transmitting portions 27 have a random shape and arrangement. Therefore, when an image display device having a large number of regularly arranged pixels is used as the display device 15 and the display device 15 and the decorative sheet 20 are superimposed, the occurrence of moire can be effectively suppressed. Such an image display device is, for example, a liquid crystal display device or an organic EL display device.

[0069] In this embodiment, the number X of element design layers 25 included in the design layer 23 and the maximum dot rate Y (%) in each element design layer 25 (251 to 254) may further satisfy the following relationship in addition to the relationship of formula 1 above. 51.2×X (-0.382) ≦ Y (Equation 4) X is a natural number. For example, when the number X of element design layers 25 included in the design layer 23 is 4, the maximum dot rate Y in each element design layer 25 is about 30.1% or more. When the maximum dot rate Y satisfies the formula 4, the area of ​​the light transmitting portion 27 can be sufficiently secured while the light reflectance in the design layer 23 can be sufficiently secured. As a result, the image light L from the display device 15 can be sufficiently secured. i When the light is not emitted, the design of the design layer 23 of the decorative sheet 20 is clearly visible to the observer 5.

[0070] According to the study of the present inventors, as shown in Table 1, when the design layer 23 includes two element design layers 25 (X=2) in which the color and arrangement of the dots 26 are different from each other and the maximum dot rate Y is 40%, the coverage of the dots 26 in the design layer 23 is approximately 50%. In this case, the observer 5 can observe a clear design. Similarly, when the design layer 23 includes one element design layer 25 (X=1) having a maximum dot rate Y of 50%, the coverage of the dots 26 in the design layer 23 is 50%. When the design layer 23 includes three element design layers 25 (X=3) having a maximum dot rate Y of 35%, the coverage of the dots 26 in the design layer 23 is approximately 50%. When the design layer 23 includes four element design layers 25 (X=4) having a maximum dot rate Y of 30%, the coverage of the dots 26 in the design layer 23 is approximately 50%. When the design layer 23 includes five element design layers 25 (X=5) having a maximum dot rate Y of 28%, the coverage of the dots 26 in the design layer 23 is approximately 50%. When the design layer 23 includes six element design layers 25 (X=6) having a maximum dot rate Y of 25%, the coverage of the dots 26 in the design layer 23 is approximately 50%. The above formula 4 is an approximation based on these data.

[0071] As shown in FIG. 7, the coverage of the halftone dots 26 in the design layer 23 having a plurality of overlapping element design layers 25 may be 50% or more and 99.5% or less. In this case, the area of ​​the light transmitting portion 27 in the design layer 23 can be further sufficiently secured. Therefore, the image light L emitted from the display device 15 and emitted toward the viewer 5 through the light transmitting portion 27 of the design layer 23 can be reduced by 50%. i That is, the amount of light from the display device 15 to the image light L can be more sufficiently secured. i When the image light L is emitted, i is more clearly visible to observer 5.

[0072] In this embodiment, the design layer 23 includes four element design layers 25 superimposed on each other. The number X of element design layers 25 included in the design layer 23 is not limited to this. The design layer 23 may include one element design layer 25. The design layer 23 may also include two, three, or five or more element design layers 25 superimposed on each other. The number X of element design layers 25 forming the design layer 23 may be six or less. The number X of element design layers 25 forming the design layer 23 may be five or less. In this case, the area of ​​the light transmitting portion 27 in the design layer 23 can be sufficiently secured.

[0073] Each element design layer 25 may have a thickness of 2 μm or more and 15 μm or less. When the thickness of the element design layer 25 is 2 μm or more, sufficient light reflectance can be ensured in the halftone dots 26 included in the element design layer 25. Therefore, the image light L from the display device 15 iWhen the light is not emitted, the design of the design layer 23 of the decorative sheet 20 is well visually recognized by the observer 5. In addition, when the thickness of the element design layer 25 is 2 μm or more, when multiple halftone dots 26 overlap in the normal direction of the design layer 23, the halftone dots 26 can absorb the light emitted from other halftone dots 26 located on the display device 15 side from the halftone dots 26. This can prevent color mixing caused by multiple halftone dots 26 overlapping in the normal direction. In addition, when the thickness of the element design layer 25 is 15 μm or less, the element design layer 25 can be printed at once using screen printing. This eliminates the need to print multiple times. Therefore, the printing process can be simplified. In addition, it is possible to prevent the position of the print from shifting between multiple printings. This makes the element design displayed by the element design layer 25 clearer. In addition, each element design layer 25 may have a thickness of 5 μm or more and 15 μm or less. Each element design layer 25 may have a thickness of 9 μm or more and 15 μm or less.

[0074] FIG. 12 shows a schematic diagram of how light incident on the front surface (first surface) 20a of the decorative sheet 20 is reflected when a black plate 30 is placed on the back surface (second surface) 20b of the decorative sheet 20. * 1, a * 1 and b * 1 is the L of light incident from the front surface 20a of the decorative sheet 20 and reflected by the black plate 30 when the black plate 30 is disposed on the back surface 20b side of the decorative sheet 20. * a * b * L in color space * The value of a * The value of b * The value of L * 2, a * 2 and b * 2 are the L of light incident on the front surface 20a of the decorative sheet 20 and reflected by the design layer 23. * a * b * L in color space * The value of a * The value of b * The color difference ΔE is defined by the following formula: *ab may be 0.7 or more in the SCI method and 0.7 or more in the SCE method. ΔE * ab=((L * 1-L * 2) 2 +(a * 1-a * 2) 2 +(b * 1-b * 2) 2 ) 1 / 2 ...(Formula 5)

[0075] The black plate 30 is a black plate with a light transmittance of 0%. The black plate 30 may be, for example, a black acrylic plate. The black plate 30 may be attached to the second surface 20b of the decorative sheet 20 using an optical adhesive. As the optical adhesive, for example, a transparent adhesive sheet known as OCA (Optical Clear Adhesive) may be used.

[0076] L * 1 and L * The value of L2 is obtained as follows. First, a spectrophotometer "CM-700d" manufactured by Konica Minolta is used to measure the visible light transmittance of the entire design layer 23. Next, a square region with a side length of 1 mm is set in the location of the design layer 23 with the lowest visible light transmittance. After that, using the above-mentioned spectrophotometer "CM-700d," the illumination diameter (diameter) is set to 11 mm, the measurement diameter (diameter) is set to 8 mm, and the L2 value is measured in the light transmitting portion 27 within the square region. * 1, a * 1, and b * 1 is measured in the area where the halftone dot 26 exists in the square area. * 2, a * 2, and b * Measure the value of 2.

[0077] The SCI (Specular Component Include) method is a method for measuring color including specular reflected light. The SCE (Specular Component Exclude) method is a method for measuring color excluding specular reflected light. The above-mentioned spectrophotometer CM-700d can be set to switch between the SCI and SCE methods.

[0078] ΔE measured using the SCI method * ΔE measured in ab and SCE methods * Since ab is 0.7 or more, the image light L i In the case where the light is not emitted, the contrast of the design displayed by the design layer 23 of the decorative sheet 20 is effectively improved. * ΔE measured in ab and SCE methods * Both a and b may be 1.0 or more. ΔE measured by the SCI method * ΔE measured in ab and SCE methods * Both ab may be 1.5 or more.

[0079] The transmittance of visible light passing through the decorative sheet 20 in the normal direction of the base material 21 may be 0.5% or more and 55% or less. When the transmittance of visible light is 0.5% or more, the image light L emitted from the display device 15 and passing through the decorative sheet 20 toward the viewer 5 side is i That is, the amount of image light L from the display device 15 can be sufficiently secured. i When the image light L i The image light L from the display device 15 is clearly visible to the observer 5. In addition, if the transmittance of visible light is 55% or less, the density of the design displayed by the design layer 23 can be sufficiently ensured. iWhen no visible light is emitted, the visibility of the design displayed by the design layer 23 of the decorative sheet 20 is effectively improved. The transmittance of visible light transmitted through the decorative sheet 20 in the normal direction to the base material 21 may be 5% or more and 55% or less. Preferably, the transmittance of visible light transmitted through the decorative sheet 20 in the normal direction to the base material 21 may be 10% or more and 35% or less. More preferably, the transmittance of visible light transmitted through the decorative sheet 20 in the normal direction to the base material 21 may be 15% or more and 25% or less.

[0080] FIG. 13 shows a schematic diagram of light emitted from a D65 light source 40 passing through the decorative sheet 20. * 3 and b * 3 are the L of light emitted from the D65 light source 40, * a * b * a in color system * The value of b * The value of a * 4 and b * 4 are the L of light emitted from the D65 light source 40 and transmitted through the decorative sheet 20 along the normal direction of the substrate 21. * a * b * a in color system * The value of b * The value of a * 3, b * 3. a * 4 and b * 4 may satisfy the following relationship: ((a * 3-a * 4) 2 +(b * 3-b * 4) 2 ) 1 / 2 ≦ 7 (Formula 6) In addition, ((a * 3-a * 4) 2 +(b * 3-b * 4) 2 ) 1 / 2 The value of may be 5 or less. * 3-a * 4) 2 +(b* 3-b * 4) 2 ) 1 / 2 The value of may be 4 or less.

[0081] D65 Illuminant 40 is the CIE standard illuminant D65. * 3, b * 3. a * 4 and b * The value of 4 is obtained by attaching an integrating sphere unit "ISN-723" to a spectrophotometer "V-670" manufactured by JASCO Corporation and measuring the light transmittance in all directions.

[0082] a * 3, b * 3. a * 4 and b * By satisfying the formula 6, the change in color of the light transmitted through the decorative sheet 20 can be reduced. i This effectively prevents the color from changing.

[0083] When the display device 15 is equipped with a touch panel, the sheet resistance of the decorative sheet 20 is 1×10 6 If the sheet resistance of the decorative sheet 20 is small, there is a risk that the touch panel will not be able to properly detect the approach of a conductor such as an operator's finger through the decorative sheet 20. In contrast, if the sheet resistance of the decorative sheet 20 is 1×10 6 If the sheet resistance is Ω / □ or more, the approach of a conductor can be appropriately detected by a touch panel through the decorative sheet 20. When the display device 15 is a dot matrix display, the sheet resistance of the decorative sheet 20 is 1×10 8 The sheet resistance of the decorative sheet 20 may be equal to or greater than Ω / □. The sheet resistance of the decorative sheet 20 can be measured using, for example, a resistivity meter (Hirester UP MCP-HT450) manufactured by Mitsubishi Chemical Analytech Co., Ltd.

[0084] The decorative sheet 20 described above can be manufactured as follows, for example. First, the first element design layer 251, the second element design layer 252, the third element design layer 253, and the fourth element design layer 254 are printed in this order on the first surface 21a of the base material 21 by screen printing. The element design layers 251 to 254 all include dots 26. At this time, the element design layers 251 to 254 are arranged so that the arrangement direction D1 of the dots 26 in the first element design layer 251, the arrangement direction D2 of the dots 26 in the second element design layer 252, the arrangement direction D3 of the dots 26 in the third element design layer 253, and the arrangement direction D4 of the dots 26 in the fourth element design layer 254 have a predetermined angle with each other. Then, the covering layer 28 is formed on the base material 21 and the design layer 23. The covering layer 28 may be formed of glass, a resin film, or a hardened resin material. The covering layer 28 may be formed by adhering a glass or resin film onto the base material 21 and the design layer 23. The covering layer 28 may also be formed by applying a resin material having fluidity onto the base material 21 and the design layer 23 and curing the applied material.

[0085] The decorative sheet 20 of this embodiment comprises a light-transmitting base material 21 and a design layer 23 laminated to the base material 21, and the design layer 23 has at least one element design layer 25, each element design layer 25 including a plurality of halftone dots 26 having the same color, and the number X of element design layers 25 included in the design layer 23 and the maximum halftone dot rate Y (%) in each element design layer 25 satisfy the following relationship: Y ≦ 99.499 × X (-0.229) ...(Formula 1)

[0086] The display device 10 with a decorative sheet of this embodiment includes a display device 15 having a display surface 17 and the above-mentioned decorative sheet 20 provided opposite the display surface 17.

[0087] According to such a decorative sheet 20 and a display device 10 with a decorative sheet, the design layer 23 having a plurality of overlapping element design layers 25 can have a sufficient area of ​​the light transmitting portion 27. Therefore, the image light L emitted from the display device 15 and emitted toward the viewer 5 through the light transmitting portion 27 of the design layer 23 can be sufficiently large.i That is, the image light L from the display device 15 can be sufficiently i When the image light L i is clearly visible to the observer 5.

[0088] Moreover, with such a decorative sheet 20 and the display device 10 with the decorative sheet, there is no need to use laser processing, which requires a long processing time and costs, to provide the light-transmitting portion 27 in the design layer 23. Moreover, by forming the design displayed by the design layer 23 with halftone dots 26, there is no need to align each element design layer 25 with high precision. This allows the decorative sheet 20 to be manufactured in a short time and at low cost.

[0089] Furthermore, by forming the design displayed by the design layer 23 with halftone dots 26, the degree of freedom in arranging each color represented by the halftone dots 26 is increased. Furthermore, by forming the design displayed by the design layer 23 with halftone dots 26, the reproducibility of colors and shades is increased. Also, the light-transmitting portions 27 have a random shape and arrangement. Therefore, when an image display device having a large number of regularly arranged pixels is used as the display device 15 and the display device 15 and the decorative sheet 20 are superimposed, the occurrence of moire can be effectively suppressed. Such an image display device is, for example, a liquid crystal display device or an organic EL display device.

[0090] In the decorative sheet 20 of this embodiment, the number X of the element design layers 25 and the maximum dot rate Y (%) satisfy the following relationship. 51.2×X (-0.382) ≦ Y (Equation 4)

[0091] Such a decorative sheet 20 can ensure a sufficient area of ​​the light transmitting portion 27 while ensuring a sufficient light reflectance in the design layer 23. As a result, when the image light Li is not emitted from the display device 15, the design of the design layer 23 of the decorative sheet 20 can be clearly seen by the observer 5.

[0092] In the decorative sheet 20 of this embodiment, the coverage of the design layer 23 by the dots 26 is 50% or more and 99.5% or less.

[0093] According to such a decorative sheet 20, the area of ​​the light transmitting portion 27 in the design layer 23 can be further sufficiently secured. Therefore, the image light L emitted from the display device 15 and emitted toward the viewer 5 through the light transmitting portion 27 of the design layer 23 can be reduced. i That is, the amount of image light L from the display device 15 can be more sufficiently secured. i When the image light L is emitted, i is more clearly visible to observer 5.

[0094] In the decorative sheet 20 of this embodiment, each element design layer 25 has a thickness of 2 μm or more and 15 μm or less.

[0095] According to such a decorative sheet 20, since the thickness of the element design layer 25 is 2 μm or more, sufficient light reflectance can be ensured in the halftone dots 26 included in the element design layer 25. Therefore, the image light L from the display device 15 i When no light is emitted, the design of the design layer 23 of the decorative sheet 20 is clearly visible to the observer 5. In addition, when the thickness of the element design layer 25 is 2 μm or more, when multiple halftone dots 26 overlap in the normal direction of the design layer 23, the halftone dots 26 can absorb the light emitted from other halftone dots 26 located closer to the display device 15 than the halftone dots 26. This can prevent color mixing caused by multiple halftone dots 26 overlapping in the normal direction. In addition, when the thickness of the element design layer 25 is 15 μm or less, the element design layer 25 can be printed at once using screen printing. This eliminates the need to print multiple times. Therefore, the printing process can be simplified. In addition, it is possible to prevent the position of the print from shifting between multiple printings. This makes the element design displayed by the element design layer 25 clearer.

[0096] In the decorative sheet 20 of this embodiment, when a black plate 30 is disposed on the back surface 20b side of the decorative sheet 20, the L of light incident from the front surface 20a of the decorative sheet 20 and reflected by the black plate 30 is * a* b * L in color space * The value of L * 1, a * The value of a * 1, b * The value of b * 1, and L of light incident on the front surface 20a of the decorative sheet 20 and reflected by the design layer 23 is * a * b * L in color space * The value of L * 2, a * The value of a * 2, b * The value of b * 2, the color difference ΔE is defined by the following formula: * ΔE measured by the SCI method for ab * ΔE measured in ab and SCE methods * Both ab are 0.7 or more. ΔE * ab=((L * 1-L * 2) 2 +(a * 1-a * 2) 2 +(b * 1-b * 2) 2 ) 1 / 2 ...(Formula 5)

[0097] According to such a decorative sheet 20, the image light L i When no light is emitted, the contrast of the design displayed by the design layer 23 of the decorative sheet 20 is effectively improved.

[0098] In the decorative sheet 20 of this embodiment, the transmittance of visible light passing through the decorative sheet 20 in the normal direction of the base material 21 is 0.5% or more and 55% or less.

[0099] When the transmittance of visible light passing through the decorative sheet 20 along the normal direction of the substrate 21 is 0.5% or more, the image light L emitted from the display device 15 and passing through the decorative sheet 20 toward the viewer 5 is iThat is, the amount of image light L from the display device 15 can be sufficiently secured. i When the image light L is emitted, i The image light L from the display device 15 is clearly visible to the observer 5. In addition, if the visible light transmittance is 55% or less, the density of the design displayed by the design layer 23 can be sufficiently ensured. i When the light is not emitted, the visibility of the design displayed by the design layer 23 of the decorative sheet 20 is effectively improved.

[0100] In the decorative sheet 20 of this embodiment, the L of light emitted from the D65 light source 40 * a * b * a in color system * The value of a * 3, b * The value of b * 3, and L of light emitted from the D65 light source 40 and transmitted through the decorative sheet 20 along the normal direction of the substrate 21. * a * b * a in color system * The value of a * 4, b * The value of b * When set to 4, a * 3, b * 3. a * 4 and b * 4 satisfies the following relationship. ((a * 3-a * 4) 2 +(b * 3-b * 4) 2 ) 1 / 2 ≦ 7 (Formula 6)

[0101] According to such a decorative sheet 20, it is possible to reduce the change in color of the light transmitted through the decorative sheet 20. Therefore, the image light L emitted from the display device 15 and transmitted through the decorative sheet 20 i This effectively prevents the color from changing.

[0102] The decorative sheet 20 of this embodiment has a sheet resistance of 1×10 6 It is Ω / □ or more.

[0103] According to such a decorative sheet 20, when the display device 15 includes a touch panel, the approach of a conductor can be appropriately detected by the touch panel through the decorative sheet 20.

[0104] In the display device 10 with a decorative sheet of this embodiment, the display device 15 is a dot matrix display.

[0105] According to such a display device 10 with a decorative sheet, the design of the dot matrix display is improved.

[0106] Various modifications may be made to the above-described embodiment. Below, the modified example will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used in the above-described embodiment are used for parts that can be configured similarly to the above-described embodiment. Furthermore, descriptions that overlap with the description of the above-described embodiment will be omitted. Furthermore, if it is clear that the effects obtained in the above-described embodiment can also be obtained in the modified example, the description will be omitted.

[0107] FIG. 14 is a partial cross-sectional view showing a modified example of the decorative sheet 20. In this modified example, the design layer 23 is provided on the second surface 21b of the base material 21. The first surface 21a of the base material 21 constitutes the first surface 20a of the decorative sheet 20 and the light output surface 10a of the display device 10 with the decorative sheet. When forming the multiple element design layers 25 constituting the design layer 23 in this modified example, they are formed on the second surface 21b in order from the element design layer 25 that should be located closest to the viewer 5. As an example, the fourth element design layer 254, the third element design layer 253, the second element design layer 252, and the first element design layer 251 are formed on the second surface 21b in this order. As a result, the design layer 23 including the element design layers 251 to 254 is formed.

[0108] According to this modification, the base material 21 can be used as a protective layer for the design layer 23. This makes it possible to omit the covering layer 28. This allows the decorative sheet 20 to be made thinner and lighter. In addition, the manufacturing process for the decorative sheet 20 can be simplified.

[0109] However, without being limited thereto, a covering layer 28 may be provided so as to cover the second surface 21b of the base material 21 and the design layer 23 from the display device 15 side. This makes it possible to protect the design layer 23 from contact with the display device 15. Also, a member arranged on the rear side of the design layer 23 can come into contact with the covering layer 28. Such a covering layer 28 may have a high transmittance of visible light. The material of the covering layer 28 may be resin. In this case, the decorative sheet 20 and the covering layer (resin portion) 28 constitute an article with a decorative sheet. The resin portion 28 is arranged on the opposite side of the base material 21 from the design layer 23.

[0110] In the above embodiment, an example in which the substrate 21 is configured as a transparent substrate has been described. As another modified example, the substrate 21 may include a low light-transmitting substrate. The low light-transmitting substrate has a transmittance of 1% or more and less than 80% in visible light. The substrate 21 may be a single-layer substrate made of a low light-transmitting substrate. The substrate 21 may be a substrate in which at least a substrate made of a low light-transmitting substrate and a substrate made of a transparent substrate are laminated. The light reflectance of the low light-transmitting substrate may be more than 20% and not more than 60%. For example, a white film substrate may be used as the low light-transmitting substrate.

[0111] According to this modified example, the contrast of the design displayed by the design layer 23 is improved.

[0112] In this modification, the L of the light emitted from the D65 light source 40 is * a * b * a in color system * The value of a * 3, b * The value of b * 3, and the L of light emitted from a D65 light source 40 and transmitted through a low light transmittance substrate along the normal direction. * a * b *a in color system * The value of a * 5, b * The value of b * When set to 5, a * 3, b * 3. a * 5 and b * 5 may satisfy the following relationship: ((a * 3-a * 5) 2 +(b * 3-b * 5) 2 ) 1 / 2 ≦ 7 (Formula 7)

[0113] a * 3, b * 3. a * 5 and b * By satisfying the formula 7, the change in color of the light transmitted through the low light transmittance substrate can be reduced. i It is possible to effectively suppress the change in color of ((a * 3-a * 5) 2 +(b * 3-b * 5) 2 ) 1 / 2 The value of may be 5 or less. * 3-a * 5) 2 +(b * 3-b * 5) 2 ) 1 / 2 The value of may be 4 or less.

[0114] FIG. 15 is a partial cross-sectional view showing yet another modified example of the decorative sheet. The decorative sheet 20 of this modified example includes a base material 21, a design layer 23, and a covering layer 28. The base material 21 includes a main body layer 22 and a partial light-shielding layer 29 laminated on the main body layer 22. In the example shown in FIG. 15, the partial light-shielding layer 29 is laminated on the display device side of the main body layer 22. The main body layer 22 may be a single-layer member made of a transparent member. The main body layer 22 may be a single-layer member made of a low light-transmitting member. The main body layer 22 may be a member in which at least a member made of a low light-transmitting member and a member made of a transparent member are laminated. The design layer 23 is laminated on the first surface 21a of the base material 21. The covering layer 28 covers the base material 21 and the design layer 23 from the viewer 5 side.

[0115] The partial light-shielding layer 29 blocks a part of the light incident from the display device 15. The partial light-shielding layer 29 may be a layer colored gray. The partial light-shielding layer 29 may be a layer colored white. When a layer colored gray is used as the partial light-shielding layer 29, the light-shielding performance is improved. Furthermore, when a layer colored white is used as the partial light-shielding layer 29, the contrast of reflected light is improved. The visible light transmittance of the partial light-shielding layer 29 may be 30% or more and 85% or less. Preferably, the visible light transmittance of the partial light-shielding layer 29 may be 30% or more and 70% or less. Furthermore, the partial light-shielding layer 29 may be a layer having a layer colored gray and a layer colored white stacked on each other. In this case, the layer colored gray may be disposed on the viewer side or the display device side with respect to the layer colored white.

[0116] The partial light-shielding layer 29 may be laminated on the viewer side of the main body layer 22. That is, the partial light-shielding layer 29 may be disposed between the main body layer 22 and the design layer .

[0117] In this modification, the L of the light emitted from the D65 light source 40 is * a * b * a in color system * The value of a * 3, b * The value of b *3, and L of light emitted from the D65 light source 40 and transmitted through the partial light blocking layer 29 along the normal direction. * a * b * a in color system * The value of a * 6, b * The value of b * When set to 6, a * 3, b * 3. a * 6 and b * 6 may satisfy the following relationship: ((a * 3-a * 6) 2 +(b * 3-b * 6) 2 ) 1 / 2 ≦ 7 (Formula 8)

[0118] a * 3, b * 3. a * 6 and b * By satisfying the formula 8, the change in color of the light transmitted through the partial light-shielding layer 29 can be reduced. i This effectively prevents the color tone from changing. * 3-a * 6) 2 +(b * 3-b * 6) 2 ) 1 / 2 The value of may be 5 or less. * 3-a * 6) 2 +(b * 3-b * 6) 2 ) 1 / 2 The value of may be 4 or less.

[0119] In this modified example, when the substrate 21 includes a low light transmittance substrate, * 3, b * 3. a * 5 and b * 5 may satisfy Equation 7.

[0120] Second embodiment Next, a second embodiment will be described. In the following description and the drawings used in the following description, the same reference numerals as those used in the first embodiment are used for parts that can be configured similarly to the first embodiment. Further, descriptions that overlap with those in the first embodiment will be omitted. Further, when it is clear that the effects and advantages obtained in the first embodiment can also be obtained in the second embodiment, the descriptions will be omitted.

[0121] Fig. 16 is a diagram for explaining a second embodiment of the present disclosure, and is a cross-sectional view showing an electronic device 100 with a decorative sheet in which a decorative sheet 20 is incorporated. Fig. 17 is a plan view showing the electronic device 100 with a decorative sheet. Fig. 18 is a plan view showing the electronic device 100 with a decorative sheet.

[0122] The electronic device 100 with the decorative sheet includes a display device 10 with the decorative sheet, a touch panel 70, and a control unit 75. The display device 10 with the decorative sheet includes a decorative sheet 20 and a display device 15. The display device 15 includes a pattern layer 60, a light diffusion layer 62, wiring 63, a light source 64, a sealant 66, and a resin part 68. The touch panel 70 can detect the approach of an external conductor to the touch panel 70. The external conductor may be, for example, a human finger. The specific configuration of the touch panel 70 is not particularly limited. For example, the touch panel 70 may be a capacitive coupling type touch panel. The control unit 75 may control the operation of the light source 64 in response to the ON / OFF of the power supply and the detection of the approach of the external conductor by the touch panel 70. As shown in FIG. 16, the control unit 75 is connected to the wiring 63 and the touch panel 70. The control unit 75 may be a semiconductor element such as a CPU.

[0123] The decorative sheet 20 has a base material 21 and a design layer 23. The design layer 23 is provided on the second surface 21b of the base material 21. The design layer 23 may include two element design layers 25. That is, the design layer 23 may include a first element design layer 251 and a second element design layer 252. The first element design layer 251 and the second element design layer 252 each have a design composed of halftone dots 26. In this embodiment, the color of the first element design layer 251 and the color of the second element design layer 252 are different from each other. In the example shown in FIG. 17, the second element design layer 252 has a design showing the letters "ABC". The second element design layer 252 is distinguished from the first element design layer 251, so that the letters "ABC" are visible. The design displayed by the second element design layer 252 (the letters "ABC") may be positioned in a position that does not overlap with the opening 61a (described below) of the pattern layer 60 in a plan view of the decorative sheet 20. The design layer 23 may display any design. In other words, the design possessed by the second element design layer 252 is not limited to the above-mentioned "ABC."

[0124] The pattern layer 60 is a member that transmits light in a predetermined pattern. The pattern layer 60 has openings 61a and light-shielding portions 61b. The openings 61a are through-holes that penetrate from the light source 64 side to the decorative sheet 20 side. The openings 61a have a predetermined pattern. The pattern layer 60 transmits light in the pattern of the openings 61a. In this embodiment, the pattern of the openings 61a includes a circular pattern and a pattern that displays the character "Power" arranged inside the circle (see FIG. 22). The pattern of the openings 61a is not limited to this. The light-shielding portions 61b have light-shielding properties. The visible light transmittance of the light-shielding portions 61b may be 0% or more and 30% or less. Preferably, the visible light transmittance of the light-shielding portions 61b may be 0% or more and 20% or less. More preferably, the visible light transmittance of the light-shielding portions 61b may be 0% or more and 10% or less.

[0125] The light diffusion layer 62 is a member that diffuses light emitted from the light source 64. The light diffusion layer 62 is disposed in an area that overlaps at least the opening 61a of the pattern layer 60 in a plan view. By diffusing the light emitted from the light source 64 by the light diffusion layer 62, it is possible to suppress the amount of light passing through the opening 61a of the pattern layer 60 from varying within the opening 61a. In the example shown in FIG. 16, the light diffusion layer 62 is disposed on the opposite side of the decorative sheet 20 with respect to the pattern layer 60. This is not limiting, and the light diffusion layer 62 may be disposed on the decorative sheet 20 side with respect to the pattern layer 60. That is, the light diffusion layer 62 may be disposed between the decorative sheet 20 and the pattern layer 60. The light diffusion layer 62 may also be disposed on both the decorative sheet 20 side and the opposite side of the decorative sheet 20 with respect to the pattern layer 60.

[0126] The wiring 63 is a part of the wiring that connects the light source 64 and the control unit 75. When the light source 64 has two electrodes, the wiring 63 includes a first wiring connected to one electrode of the light source 64 and a second wiring connected to the other electrode of the light source 64. The wiring 63 is formed of a material having electrical conductivity. For example, the wiring 63 may be formed by printing a paste containing metal particles. The metal constituting the metal particles may be a metal such as gold, silver, or copper.

[0127] The light source 64 may be, for example, a light-emitting element such as an LED (light-emitting diode). Without being limited thereto, the light source 64 may be another light-emitting member. The light source 64 may be disposed between the decorative sheet 20 and the resin part 68. The operation of the light source 64 is controlled by the control unit 75. The operation of the light source 64 may include emitting and stopping light, and increasing and decreasing the amount of light emitted from the light source 64. The light source 64 may include one light-emitting element. The light source 64 may include two or more light-emitting elements. The two or more light-emitting elements may emit light having different colors from each other. One light-emitting element may emit two or more lights having different colors from each other.

[0128] The sealing material 66 is a member that seals the light source 64. The sealing material 66 protects the light source 64. The sealing material 66 also holds the light source 64 in contact with the wiring 63. The sealing material 66 may be formed of a resin having optical transparency.

[0129] The resin part 68 is a member that holds the decorative sheet 20. The shape of the decorative sheet 20 is maintained by the resin part 68. The resin part 68 is disposed on the opposite side of the base material 21 with respect to the design layer 23. The resin part 68 may be a thermoplastic resin. The thermoplastic resin is not particularly limited, but may be, for example, acrylonitrile-butadiene-styrene resin (hereinafter sometimes referred to as "ABS resin"), acrylic resin; polyolefin resin such as polypropylene or polyethylene; polycarbonate resin; vinyl chloride resin; polyethylene terephthalate (PET) resin, acrylonitrile-butadiene-styrene resin; acrylonitrile-styrene-acrylic ester resin, or the like. The resin part 68 may be formed by injection molding. For example, the resin part 68 may be formed by so-called insert injection molding, in which the decorative sheet 20 is disposed inside a mold and a thermoplastic resin is injected into the mold.

[0130] In this embodiment, the decorative sheet 20 and the resin part 68 constitute the article 80 with the decorative sheet. In this embodiment, the resin part 68 holds the decorative sheet 20 via the pattern layer 60 and the light diffusion layer 62. Therefore, the article 80 with the decorative sheet may include at least one of the pattern layer 60 and the light diffusion layer 62 arranged between the decorative sheet 20 and the resin part 68. The article 80 with the decorative sheet may include at least one of the wiring 63, the light source 64, and the sealing material 66. The article 80 with the decorative sheet may also be a display device 10 with the decorative sheet. That is, the article 80 with the decorative sheet may include the decorative sheet 20 and the display device 15. In this case, the display device 15 may include the resin part 68.

[0131] Next, an example of the operation of the electronic device 100 with the decorative sheet will be described. Fig. 17 and Fig. 18 are diagrams showing the electronic device 100 with the decorative sheet as seen from the observer side. When the power supply of the electronic device 100 with the decorative sheet is OFF, the design layer 23 is visible to the observer as shown in Fig. 17. That is, the second element design layer 252 is distinguished from the first element design layer 251, and the characters "ABC" are therefore visible. At this time, the light source 64 does not emit light. Therefore, the pattern of the opening 61a of the pattern layer 60 is not visible to the observer.

[0132] When the power supply of the electronic device 100 with the decorative sheet is turned on, the control unit 75 supplies power to the light source 64 via the wiring 63. This causes the light source 64 to emit light. The light emitted from the light source 64 enters the light diffusion layer 62, is diffused by the light diffusion layer 62, and then is emitted toward the pattern layer 60. Of the light that enters the pattern layer 60, the light that enters the light shielding portion 61b is absorbed or reflected by the light shielding portion 61b. Therefore, this light does not pass through the pattern layer 60. Of the light that enters the pattern layer 60, the light that enters the opening 61a passes through the opening 61a and is emitted toward the design layer 23. This light passes through the design layer 23 and is visually recognized by the observer. Therefore, as shown in FIG. 18, the pattern of the opening 61a of the pattern layer 60 is visually recognized by the observer together with the design layer 23. In the example shown in Figs. 16 to 18, the design (letters "ABC") displayed by the second element design layer 252 is positioned at a position that does not overlap with the opening 61a of the pattern layer 60 in a plan view of the decorative sheet 20. As a result, the design displayed by the second element design layer 252 and the pattern of the opening 61a of the pattern layer 60 do not overlap with each other and are viewed simultaneously. The light source 64 may emit light having a first color. For example, the first color may be red. At this time, the pattern of the opening 61a of the pattern layer 60 is viewed by the viewer as a pattern of the first color (red).

[0133] When the touch panel 70 detects the approach of an external conductor to the touch panel 70, the control unit 75 may control the light source 64 to change the color of the light emitted by the light source 64. The control unit 75 may control the light source 64 to emit light having a second color different from the first color. For example, the second color may be green. At this time, the pattern of the openings 61a of the pattern layer 60 is visually recognized by the observer. At this time, the pattern of the openings 61a of the pattern layer 60 is visually recognized by the observer as a pattern of the second color (green). The external conductor may be, for example, a human finger.

[0134] When the electronic device 100 with the decorative sheet is powered off, the control unit 75 stops the supply of power to the light source 64. That is, the light source 64 stops emitting light. As a result, the pattern of the openings 61a of the pattern layer 60 becomes invisible to the observer.

[0135] Next, an example of a method for manufacturing the display device 10 with the decorative sheet and the article 80 with the decorative sheet will be described with reference to FIGS.

[0136] First, as shown in Fig. 19, the design layer 23 is disposed on the second surface 21b of the substrate 21. The design layer 23 may include a first element design layer 251 and a second element design layer 252. The first element design layer 251 including the dots 26 may be formed on the second surface 21b of the substrate 21 by screen printing. Thereafter, the second element design layer 252 including the dots 26 may be formed on the second surface 21b of the substrate 21 by screen printing. In this way, the decorative sheet 20 having the substrate 21 and the design layer 23 can be produced.

[0137] 20 is a plan view showing the decorative sheet 20 of FIG. 19. The color of the dots 26 included in the first element design layer 251 and the color of the dots 26 included in the second element design layer 252 are different from each other. This allows the second element design layer 252 to be distinguished from the first element design layer 251. In the example shown in FIG. 20, the second element design layer 252 has a design showing the letters "ABC". Therefore, the second element design layer 252 is distinguished from the first element design layer 251, and the letters "ABC" are therefore visible.

[0138] Next, as shown in FIG. 21, a pattern layer 60 is formed on the design layer 23 on the side opposite to the substrate 21. The pattern layer 60 may be formed by screen printing. The pattern layer 60 has an opening 61a and a light-shielding portion 61b. The opening 61a is a through hole penetrating from the light source 64 side to the decorative sheet 20 side. FIG. 22 is a plan view showing the pattern layer 60 as viewed from the observer side. In the example shown in FIG. 22, the pattern of the opening 61a includes a circle pattern and a pattern displaying the character "Power" arranged inside the circle.

[0139] Next, a light diffusion layer 62 is formed on the pattern layer 60 on the side opposite to the decorative sheet 20 (see FIG. 23). The light diffusion layer 62 may be formed by attaching a film having a function of diffusing transmitted light to the pattern layer 60. The light diffusion layer 62 may also be formed by screen printing.

[0140] Next, as shown in Fig. 24, wiring 63 is formed on the light diffusion layer 62 on the side opposite to the pattern layer 60. For example, the wiring 63 may be formed by screen printing a silver paste. Then, the light source 64 is disposed (see Fig. 25). At this time, the electrode of the light source 64 is connected to the wiring 63.

[0141] Next, a sealant 66 is provided so as to cover the light source 64 (see FIG. 26). The sealant 66 may be formed by discharging a resin material having fluidity using a dispenser or the like. The resin material may have optical transparency. The sealant 66 may be provided so as to cover the entire light source 64 and a part of the wiring 63.

[0142] Next, the resin part 68 is provided. The resin part 68 covers the sealing material 66 and the light diffusion layer 62. The resin part 68 may be a thermoplastic resin. The resin part 68 may be formed by injection molding. For example, the resin part 68 may be formed by so-called insert injection molding, in which the decorative sheet 20 is placed inside a mold and a thermoplastic resin is injected into the mold.

[0143] In this manner, the display device 10 with the decorative sheet and the article 80 with the decorative sheet shown in FIG. 27 can be manufactured. The display device 10 with the decorative sheet shown in FIG. 27 includes the decorative sheet 20 and the display device 15. The display device 15 may include a pattern layer 60, a light diffusion layer 62, wiring 63, a light source 64, a sealant 66, and a resin part 68. The article 80 with the decorative sheet shown in FIG. 27 includes the decorative sheet 20 and a resin part 68 arranged on the opposite side of the base material 21 with respect to the design layer 23 of the decorative sheet 20. The article 80 with the decorative sheet may include at least one of the pattern layer 60 and the light diffusion layer 62 arranged between the decorative sheet 20 and the resin part 68. The article 80 with the decorative sheet may include at least one of the wiring 63, the light source 64, and the sealant 66.

[0144] FIG. 28 is a cross-sectional view showing a modified example of the display device 10 with the decorative sheet and the product 80 with the decorative sheet of the second embodiment. The decorative sheet 20 includes a base material 21, a design layer 23, and a partial light-shielding layer 29. In this modified example, the partial light-shielding layer 29 is disposed on the opposite side of the design layer 23 to the base material 21. In other words, the partial light-shielding layer 29 is disposed on the display device 15 side with respect to the design layer 23. The partial light-shielding layer 29 blocks a part of the light incident from the display device 15. The partial light-shielding layer 29 may be a layer colored gray or black. When a layer colored gray or black is used as the partial light-shielding layer 29, the light-shielding performance is improved. The partial light-shielding layer 29 may be a layer colored white. When a layer colored white is used as the partial light-shielding layer 29, the contrast of reflected light is improved. The visible light transmittance of the partial light-shielding layer 29 may be 30% or more and 85% or less.

[0145] 29 is a cross-sectional view showing another modified example of the display device 10 with the decorative sheet and the article 80 with the decorative sheet of the second embodiment. The decorative sheet 20 includes a base material 21, a design layer 23, and a partial light-shielding layer 29. In this modified example, the partial light-shielding layer 29 includes a first layer 291 and a second layer 292. The second layer 292 is disposed on the opposite side of the first layer 291 to the design layer 23. The first layer 291 may be a layer colored white. The second layer 292 may be a layer colored gray or black. In this case, the first layer 291 improves the contrast of reflected light, and the second layer 292 improves the light-shielding performance.

[0146] The partial light-shielding layer 29 in the example shown in FIG. 28 and the first layer 291 and the second layer 292 in the example shown in FIG. 29 may be layers in which ink is printed on the entire surface of the display device 15 side of the base material 21 and the design layer 23, so-called solid printed layers. Also, the partial light-shielding layer 29 in the example shown in FIG. 28 and the first layer 291 and the second layer 292 in the example shown in FIG. 29 may be layers formed of a large number of printed halftone dots. When the partial light-shielding layer 29, the first layer 291, and the second layer 292 are layers including halftone dots, the visible light transmittance of the halftone dots may be 50% or more and 90% or less. Preferably, the visible light transmittance of the halftone dots may be 60% or more and 80% or less. Here, the visible light transmittance of the halftone dots is the transmittance of one layer of halftone dots. The visible light transmittance of the halftone dots that may be included in the partial light-shielding layer 29, the first layer 291, and the second layer 292 is greater than the visible light transmittance of the halftone dots 26 included in the design layer 23. Therefore, the halftone dots that may be included in the partial light-shielding layer 29, the first layer 291, and the second layer 292 and the halftone dots 26 included in the design layer 23 can be distinguished from each other by the visible light transmittance.

[0147] FIG. 30 is a cross-sectional view showing yet another modified example of the display device 10 with the decorative sheet and the product 80 with the decorative sheet of the second embodiment. FIG. 31 is a plan view showing the display device 10 with the decorative sheet of this modified example. The decorative sheet 20 includes a base material 21, a design layer 23, and an additional design layer 90. The design layer 23 of this modified example includes a first element design layer 251. The additional design layer 90 is disposed between the base material 21 and the design layer 23. The additional design layer 90 has a design configured with a predetermined pattern. In the example shown in FIG. 31, the additional design layer 90 has a design showing the letters "DEF". The additional design layer 90 is a layer in which ink is printed over the entire predetermined pattern, a so-called solid printed layer. Therefore, the additional design layer 90 is not an element design layer 25 including halftone dots 26.

[0148] The color of the first element design layer 251 and the color of the additional design layer 90 are different from each other. In the example shown in FIG. 31, the additional design layer 90 is distinguished from the first element design layer 251, and the letters "DEF" are visible. The design displayed by the additional design layer 90 (the letters "DEF") may be positioned so as not to overlap with the opening 61a of the pattern layer 60 in a planar view of the decorative sheet 20. The additional design layer 90 may display any design. In other words, the design possessed by the additional design layer 90 is not limited to the above-mentioned "DEF".

[0149] As another modification, the decorative sheet 20 may include a light transmittance adjusting layer. The light transmittance adjusting layer adjusts the transmittance of light passing through the decorative sheet 20. The light transmittance adjusting layer adjusts the transmittance of light passing through the openings 61a of the pattern layer 60. The light transmittance adjusting layer may be disposed between the substrate 21 and the design layer 23. The light transmittance adjusting layer is disposed so as to include a position overlapping with the openings 61a of the pattern layer 60 in a plan view of the decorative sheet 20. The light transmittance adjusting layer is a layer in which ink is printed over the entirety of a predetermined pattern, that is, a so-called solid printed layer. Therefore, the light transmittance adjusting layer is not the element design layer 25 including the halftone dots 26. The visible light transmittance of the light transmittance adjusting layer may be 50% or more and 90% or less. The visible light transmittance of the light transmittance adjusting layer may be 60% or more and 80% or less.

[0150] As yet another modified example, the article 80 with a decorative sheet may have a decorative sheet 20 and a conductive pattern 72. The conductive pattern 72 is laminated on the decorative sheet 20. The conductive pattern 72 may be laminated directly on the decorative sheet 20. The conductive pattern 72 may be laminated on the decorative sheet 20 via another member. The conductive pattern 72 is made of, for example, a metal material having a predetermined pattern. This conductive pattern 72 may be a part of a touch panel. The touch panel is, for example, a capacitive coupling type touch panel. In this case, the conductive pattern 72 may be at least a part of a detection electrode 71. The detection electrode 71 detects the approach of an external conductor to the touch panel. The external conductor is, for example, a human finger.

[0151] Fig. 32 is a plan view showing an example of the conductive pattern 72 in an article 80 with a decorative sheet. Fig. 33 is a plan view showing another example of the conductive pattern 72. Fig. 34 is a plan view showing yet another example of the conductive pattern 72. All of Figs. 32 to 34 show the conductive pattern 72 as viewed from the opposite side to the viewer.

[0152] The conductive pattern 72 is disposed, for example, on the opposite side of the decorative sheet 20 with respect to the pattern layer 60. In the example shown in FIG. 32, the conductive pattern 72 has a ring-shaped portion 72a. The ring-shaped portion 72a has a shape obtained by cutting out a part of a circle. The portions of the conductive pattern 72 extending from both ends of the ring-shaped portion 72a are connected to a control unit 75. The ring-shaped portion 72a constitutes at least a part of the detection electrode 71.

[0153] At least a part of the conductive pattern 72 may be disposed in a region corresponding to the opening 61a of the pattern layer 60 in a plan view. The annular portion 72a is disposed, for example, concentrically with the circular outline of the opening 61a of the pattern layer 60 in a plan view. However, it is preferable that the annular portion 72a is disposed so as not to overlap with the opening 61a of the pattern layer 60 in a plan view. This can suppress the annular portion 72a from blocking light passing through the opening 61a. The annular portion 72a may be disposed outside the circular outline of the opening 61a in a plan view. The annular portion 72a may be disposed inside the circular outline of the opening 61a in a plan view. The conductive pattern 72 is formed, for example, by printing a silver paste or a copper paste.

[0154] A transparent conductive film 73 may be laminated on the conductive pattern 72. The transparent conductive film 73 is in contact with the conductive pattern 72. The transparent conductive film 73 is disposed on the opposite side of the decorative sheet 20 with respect to the conductive pattern 72. The transparent conductive film 73 may have a circular outline. The transparent conductive film 73 may cover the entire annular portion 72a. The transparent conductive film 73 may include any of ITO, PEDOT:PSS, nano Ag ink, and carbon nanotubes. ITO is indium tin oxide. PEDOT:PSS is poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonic acid). The transparent conductive film 73 may be formed by printing. The transparent conductive film 73 is a part of the detection electrode 71. By laminating the transparent conductive film 73 on the conductive pattern 72, the area of ​​the detection electrode 71 can be sufficiently secured.

[0155] 33, a light source 64 is disposed inside the annular portion 72a. A wiring 63 is connected to the light source 64. One end of the wiring 63 is connected to the light source 64. The other end of the wiring 63 is connected to the control unit 75.

[0156] In the example shown in FIG. 34, a transparent conductive film 73 is laminated on a conductive pattern 72. Furthermore, wiring 63 is laminated on the transparent conductive film 73. A light source 64 is connected to the wiring 63. The wiring 63 and the light source 64 are disposed on the opposite side of the decorative sheet 20 with respect to the transparent conductive film 73. An insulating film is disposed between the transparent conductive film 73 and the wiring 63. The insulating film is formed of, for example, a resin. Illustration of the insulating film is omitted in FIG. 34.

[0157] 33 and 34, the light source 64 is controlled by the control unit 75 in response to the approach of an external conductor to the detection electrode 71. The specific operation of the light source 64 may be the same as that of the example described with reference to FIG.

[0158] A number of modified examples of the above-described embodiment have been described. The above-described multiple modified examples may be combined as appropriate.

Claims

1. A decorative sheet comprising a light-transmitting substrate and a design layer laminated on the substrate, The design layer has at least two element design layers, Each element design layer includes a plurality of halftone dots having the same color, The coverage of the dots in the design layer is 50% or more and 99.5% or less, The at least two element design layers include a first element design layer and a second element design layer laminated on the first element design layer, The arrangement direction of the halftone dots of the first element design layer and the arrangement direction of the halftone dots of the second element design layer have a predetermined angle (excluding 0 degrees), The number X of the element design layers included in the design layer and the maximum dot rate Y (%) in each element design layer satisfy the following relationship: Y ≦ 99.499×X （－０．２２９） When a black plate is placed on the back side of the decorative sheet, the L* value in the L*a*b* color system of light incident on the front side of the decorative sheet and reflected by the black plate is L*1, the a* value is a*1, and the b* value is b*1, and the L* value in the L*a*b* color system of light incident on the front side of the decorative sheet and reflected by the design layer is L*2, the a* value is a*2, and the b* value is b*2, with respect to the color difference ΔE*ab defined by the following formula, both ΔE*ab measured using the SCI method and ΔE*ab measured using the SCE method are 0.7 or more. ΔE * ab = ((L * 1 - L * 2) 2 + (a * 1 - a * 2) 2 + (b * 1 - b * 2) 2) 1 / 2

2. A decorative sheet comprising a light-transmitting substrate and a design layer laminated on the substrate, The design layer has at least two element design layers, Each element design layer includes a plurality of halftone dots having the same color, The coverage of the dots in the design layer is 50% or more and 99.5% or less, The at least two element design layers include a first element design layer and a second element design layer laminated on the first element design layer, The arrangement direction of the halftone dots of the first element design layer and the arrangement direction of the halftone dots of the second element design layer have a predetermined angle (excluding 0 degrees), The number X of the element design layers included in the design layer and the maximum dot rate Y (%) in each element design layer satisfy the following relationship: Y ≦ 99.499×X (-0.229) A decorative sheet, wherein the transmittance of visible light passing through the decorative sheet in the normal direction of the base material is 0.5% or more and 55% or less.

3. A decorative sheet comprising a light-transmitting substrate and a design layer laminated on the substrate, The design layer has at least two element design layers, Each element design layer includes a plurality of halftone dots having the same color, The coverage of the dots in the design layer is 50% or more and 99.5% or less, The at least two element design layers include a first element design layer and a second element design layer laminated on the first element design layer, The arrangement direction of the halftone dots of the first element design layer and the arrangement direction of the halftone dots of the second element design layer have a predetermined angle (excluding 0 degrees), The number X of the element design layers included in the design layer and the maximum dot rate Y (%) in each element design layer satisfy the following relationship: Y ≦ 99.499×X (-0.229) A decorative sheet in which a*3, b*3 in the L*a*b* color system of light emitted from a D65 light source, a*4 in the L*a*b* color system of light emitted from the D65 light source and transmitted through the decorative sheet along the normal direction of the substrate, and a*3, b*3, a*4 and b*4 satisfy the following relationship: ((a * 3 - a * 4) 2 + (b * 3 - b * 4) 2 ) 1 / 2 ≦ 7

4. A decorative sheet comprising a light-transmitting substrate and a design layer laminated on the substrate, The design layer has at least two element design layers, Each element design layer includes a plurality of halftone dots having the same color, The coverage of the dots in the design layer is 50% or more and 99.5% or less, The at least two element design layers include a first element design layer and a second element design layer laminated on the first element design layer, The arrangement direction of the halftone dots of the first element design layer and the arrangement direction of the halftone dots of the second element design layer have a predetermined angle (excluding 0 degrees), The number X of the element design layers included in the design layer and the maximum dot rate Y (%) in each element design layer satisfy the following relationship: Y ≦ 99.499×X (-0.229) A decorative sheet having a sheet resistance of 1×10 6 Ω / □ or more.

5. The decorative sheet according to any one of claims 1 to 4, wherein the number X of the element design layers and the maximum dot rate Y (%) satisfy the following relationship: 51.2×X （－０．３８２） ≦ Y

6. The decorative sheet according to any one of claims 1 to 5, wherein each element design layer has a thickness of 2 µm or more and 15 µm or less.

7. A display device having a display surface; A display device with a decorative sheet, comprising: the decorative sheet according to any one of claims 1 to 6, which is provided facing the display surface.

8. The display device is a dot matrix display. A display device with the decorative sheet according to claim 7 .

9. The decorative sheet according to any one of claims 1 to 6, An article with a decorative sheet, comprising: a resin portion arranged on the opposite side of the substrate with respect to the design layer.

10. The article with the decorative sheet according to claim 9 , further comprising a light source disposed between the decorative sheet and the resin part.

11. The article with a decorative sheet according to claim 10 , wherein the light source is an LED.

12. A decorative sheet comprising a light-transmitting substrate and a design layer laminated on the substrate, The design layer has at least two element design layers, Each element design layer includes a plurality of halftone dots having the same color, The coverage of the dots in the design layer is 50% or more and 99.5% or less, The at least two element design layers include a first element design layer and a second element design layer laminated on the first element design layer, The arrangement direction of the halftone dots of the first element design layer and the arrangement direction of the halftone dots of the second element design layer have a predetermined angle (excluding 0 degrees), A decorative sheet in which the number X of the element design layers included in the design layer and the maximum dot rate Y (%) in each element design layer satisfy the following relationship; Y ≦ 99.499×X (-0.229) An article with a decorative sheet, comprising: a conductive pattern laminated on the decorative sheet.

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