Decorative sheet, decorative member, and display system

Abstract

A decorative sheet (20) has a first surface (20a) and a second surface (20b). The decorative sheet (20) includes a design layer (25) having a design (D) that can be observed from the first surface (20a). The L* value of the decorative sheet (20) expressed using the L*a*b* color system is 25.0-45.0 in a measurement with an SCI method using reflected light when the first surface (20a) is the incident surface.

Description

Decorative sheet, decorative member and display system

[0001] The present disclosure relates to a decorative sheet, a decorative member, and a display system.

[0002] As disclosed in WO 2020 / 040195 A1, a display system for displaying an image is known. The display system includes a light-emitting device and a decorative sheet overlaid on the light-emitting device. The display system displays an image using light emitted from the light-emitting device. The display system displays a design using the decorative sheet.

[0003] In a display system illuminated by external light, the visibility of the image deteriorates. The inventors of the present invention confirmed that the visibility of the image deteriorated depending on the type of design expressed by the decorative sheet.

[0004] The present disclosure aims to improve the visibility of images in a display system.

[0005] A first decorative sheet according to an embodiment of the present disclosure is a decorative sheet including a first surface and a second surface, and is provided with a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The value is 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

[0006] A second decorative sheet according to an embodiment of the present disclosure is a decorative sheet including a first surface and a second surface, and is provided with a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

[0007] A first decorative member according to an embodiment of the present disclosure includes, from a first surface to a second surface, a decorative sheet and a thermoplastic resin portion superimposed on the decorative sheet, in this order, the decorative sheet including a design layer having a design observable from the first surface;＊ a ＊ b ＊ L in color system ＊ The value is 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

[0008] A second decorative member according to an embodiment of the present disclosure includes, from a first surface to a second surface, a decorative sheet and a thermoplastic resin portion superimposed on the decorative sheet, in this order, the decorative sheet including a design layer having a design observable from the first surface; ＊ a ＊ b ＊ L in color system ＊ The value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

[0009] A first display system according to an embodiment of the present disclosure includes: a light-emitting device; and a decorative sheet that is overlaid on a light-emitting surface of the light-emitting device and forms a display surface, the decorative sheet including a design layer having a design that can be observed from the display surface; ＊ a ＊ b ＊ L in color system ＊ The value is 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the display surface as the incident surface.

[0010] A second display system according to an embodiment of the present disclosure includes: a light-emitting device; and a decorative sheet that is overlaid on a light-emitting surface of the light-emitting device and forms a display surface, the decorative sheet including a design layer having a design that can be observed from the display surface; ＊ a ＊ b ＊ L in color system ＊ The value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the display surface as the incident surface.

[0011] According to the present disclosure, it is possible to improve the visibility of images in a display system.

[0012] FIG. 1 is an exploded perspective view of a display system for explaining one embodiment. FIG. 2 is a cross-sectional view of the display system of FIG. 1. FIG. 3 is a plan view of a pattern mask included in the display system of FIG. 1. FIG. 4 is a plan view of the display system of FIG. 1 in a display state. FIG. 5 is an enlarged plan view of a decorative sheet included in the display system of FIG. 1 when observed from the first surface. FIG. 6 is an enlarged view of the display system of FIG. 2. FIG. 7 is a diagram for explaining a method for determining the area of ​​a high-brightness reflective region. FIG. 8 is a diagram for explaining a lens device. FIG. 9 is a diagram for explaining measurement conditions for a high-brightness reflective region. FIG. 10 is a diagram for explaining a method for determining the variation in pixel values ​​in a grayscale image obtained by capturing an image of the first surface of a decorative sheet. FIG. 11 is a graph showing the distribution of pixel values ​​in the grayscale image of FIG. 10. FIG. 12 is a diagram for explaining a method for determining the area of ​​a high-brightness display region. FIG. 13 is a diagram showing an example of a high-brightness display region. FIG. 14 is a cross-sectional view of a modified decorative sheet. FIG. 15 is a cross-sectional view of another modified decorative sheet. FIG. 16 is a perspective view of a modified display system. Fig. 17 is a plan view of the display system of Fig. 16 in a display state. Fig. 18 is a cross-sectional view of the display system of Fig. 17. Fig. 19 is a cross-sectional view of another modified display system. Fig. 20 is an enlarged plan view of yet another modified decorative sheet when observed from the first surface. Fig. 21 is a modified decorative member shown in Fig. 16.

[0013] An embodiment of the present disclosure relates to the following [1] to

[40] .

[0014] [1] A decorative sheet including a first surface and a second surface, comprising a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative sheet has a value of 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

[0015] [2] L ＊ a ＊ b ＊ L in color system ＊The decorative sheet according to [1], wherein the value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

[0016] [3] The design includes a pattern, and L is measured by the SCI method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊ The decorative sheet of [1] or [2], wherein the difference between the maximum and minimum values ​​of 10 measured values ​​is 0.4 or more and 11.0 or less.

[0017] [4] L measured by an SCI method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊ The decorative sheet of [1] or [2], wherein the difference between the maximum and minimum values ​​of 10 measured values ​​for the total light transmittance is 0.1 or more and 9.0 or less, and the difference between the maximum and minimum values ​​of 25 measured values ​​for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

[0018] [5] A decorative sheet including a first surface and a second surface, comprising a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative sheet has a value of 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

[0019] [6] L measured by an SCE method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊ The decorative sheet of [5], wherein the difference between the maximum and minimum values ​​of ten measured values ​​is 0.5 or more and 11.0 or less.

[0020] [7] L measured by the SCE method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊The decorative sheet according to [5], wherein the difference between the maximum and minimum values ​​of 10 measured values ​​for the total light transmittance is 0.1 or more and 9.0 or less, and the difference between the maximum and minimum values ​​of 25 measured values ​​for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

[0021] [8] The L measured by the SCI method using reflected light with the first surface as the incident surface, relative to the total light transmittance [%] ＊ a ＊ b ＊ L in color system ＊ The decorative sheet according to any one of [1] to [7], wherein the ratio of the values ​​is 1.5 or less.

[0022] [9] L measured by the SCE method using reflected light with the first surface as the incident surface, relative to the total light transmittance [%] ＊ a ＊ b ＊ L in color system ＊ The decorative sheet according to any one of [1] to [8], wherein the ratio of the values ​​is 1.0 or less.

[0023]

[10] The decorative sheet according to any one of [1] to [9], wherein the area ratio of the high brightness reflective region is 35% or less.

[0024]

[11] L measured by the SCE method using reflected light with the first surface as the incident surface, relative to the total light transmittance [%] ＊ a ＊ b ＊ L in color system ＊ The decorative sheet according to any one of [1] to

[11] , wherein the ratio of the values ​​is 0.1 or more and 1.0 or less.

[0025]

[12] The decorative sheet of any one of [1] to

[11] , wherein the decorative sheet is overlaid on a display device including a light-emitting device and a pattern mask from the second surface, the pattern mask includes an opening region through which light emitted from the light-emitting device can pass, an area of ​​a high-brightness display region in a state in which a first light is irradiated onto the first surface and a second light is irradiated onto the second surface is 0.5 to 2.5 times the area of ​​the opening region, the first light is light incident on the first surface at an incident angle of 21.75°, and the second light is the light emitted from the display device.

[0026]

[13] The decorative sheet according to any one of [1] to

[12] , comprising a pattern mask layer that forms the second surface and has a visible light blocking property, and including a recess that opens to the second surface.

[0027]

[14] The decorative sheet according to any one of [1] to

[13] , having a total light transmittance of 10% or more and 50% or less.

[0028]

[15] The decorative sheet according to any one of [1] to

[14] , wherein the design includes a pattern, and in a 256-level grayscale image obtained by capturing an image of the first surface while irradiating the first surface with light at an incident angle of 21.75°, the variation in pixel values ​​is 15 or more and 65 or less.

[0029]

[16] The decorative sheet according to any one of [1] to

[15] , which includes a plurality of non-decorative portions that do not form a design, and the plurality of non-decorative portions are regularly arranged two-dimensionally in a plan view.

[0030]

[17] The decorative sheet according to any one of [1] to

[15] , including, in a plan view, a first portion in which non-decorative portions that do not form a design are regularly arranged two-dimensionally, and a second portion that does not include the non-decorative portions.

[0031]

[18] A decorative member comprising: a decorative sheet according to any one of [1] to

[17] ; and a thermoplastic resin part superimposed on the decorative sheet.

[0032]

[19] A decorative sheet and a thermoplastic resin part superimposed on the decorative sheet are provided in this order from a first surface to a second surface, the decorative sheet including a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative member has a value of 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

[0033]

[20] L ＊ a ＊ b ＊ L in color system ＊The decorative member of

[19] , wherein the value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as an incident surface.

[0034]

[21] The design includes a pattern, and L is measured by the SCI method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊ The decorative member according to

[19] or

[20] , wherein the difference between the maximum and minimum values ​​of ten measured values ​​is 0.4 or more and 11.0 or less.

[0035]

[22] L measured by an SCI method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊ The decorative member of

[19] or

[20] , wherein the difference between the maximum and minimum values ​​of 10 measured values ​​for the total light transmittance is 0.1 or more and 9.0 or less, and the difference between the maximum and minimum values ​​of 25 measured values ​​for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

[0036]

[23] A decorative sheet and a thermoplastic resin part superimposed on the decorative sheet are provided in this order from a first surface to a second surface, the decorative sheet including a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative member has a value of 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

[0037]

[24] The design includes a pattern, and L is measured by the SCE method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊ The decorative member according to

[23] , wherein the difference between the maximum and minimum values ​​of ten measured values ​​is 0.5 or more and 11.0 or less.

[0038]

[25] L measured by an SCE method at 10 different points on the first surface using reflected light with the first surface as an incident surface. ＊The decorative member of

[23] or

[24] , wherein the difference between the maximum and minimum values ​​of 10 measured values ​​for the total light transmittance is 0.1 or more and 9.0 or less, and the difference between the maximum and minimum values ​​of 25 measured values ​​for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

[0039]

[26] The decorative member according to any one of

[18] to

[25] , having a total light transmittance of 7% or more and 50% or less.

[0040]

[27] The decorative member according to any one of

[18] to

[26] , wherein the decorative sheet includes a plurality of non-decorative portions that do not form a design, and the plurality of non-decorative portions are regularly arranged two-dimensionally in a plan view.

[0041]

[28] The decorative member according to any one of

[18] to

[26] , which includes, in a plan view, a first portion in which non-decorative portions that do not form a design of the decorative sheet are regularly arranged two-dimensionally, and a second portion in which the decorative sheet does not include the non-decorative portions.

[0042]

[29] A display system comprising: a light-emitting device; and a decorative sheet according to any one of [1] to

[17] or a decorative member according to any one of

[17] to

[28] superimposed on the light-emitting device.

[0043]

[30] A light-emitting device, and a decorative sheet according to any one of [1] to

[17] superimposed on the light-emitting surface of the light-emitting device from the second surface side, ＊ a ＊ b ＊ L in color system ＊ The display system has a value of 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the light-emitting surface as the incident surface.

[0044]

[31] A light-emitting device, and a decorative sheet according to any one of [1] to

[17] superimposed on the light-emitting surface of the light-emitting device from the second surface side, ＊ a ＊ b ＊ L in color system ＊The display system has a value of 0.2 or more and 25.0 or less when measured by the SCE method using reflected light with the light-emitting surface as the incident surface.

[0045]

[32] A light-emitting device, and a decorative sheet that is overlaid on a light-emitting surface of the light-emitting device and forms a display surface, the decorative sheet having a design layer that has a design that can be observed from the display surface, L ＊ a ＊ b ＊ L in color system ＊ The value is 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the display surface as the incident surface.

[0046]

[33] L ＊ a ＊ b ＊ L in color system ＊ The display system of

[32] , wherein the value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the display surface as the incident surface.

[0047]

[34] The display system of any of

[29] to

[33] , further comprising: a pattern mask disposed between the light-emitting device and the decorative sheet, the pattern mask having an opening region through which light can pass; the decorative sheet is overlaid on the light-emitting device from the second surface; an area of ​​a high-brightness display region in a state in which a first light is irradiated onto the first surface and a second light is irradiated onto the second surface is 0.5 to 2.5 times the area of ​​the opening region; the first light is light that is incident on the first surface at an incident angle of 21.75°; and the second light is light that is emitted from the light-emitting device and passes through the opening region.

[0048]

[35] The display system of any one of

[29] to

[34] , further comprising a joint that joins the decorative sheet and the light-emitting device, wherein the decorative sheet includes an adjacent layer adjacent to the joint, the adjacent layer including one or more of acrylic, polyethylene terephthalate, polycarbonate, polypropylene, and triacetyl cellulose, and the joint including one or more of an optically transparent resin and glycerin.

[0049]

[36] The display system of any one of

[29] to

[35] , further comprising a joint that joins the decorative sheet and the light emitting device, the joint being adjacent to the light emitting surface of the light emitting device, the light emitting surface of the light emitting device including one or more of alkali-free glass, soda glass, acrylic, and polycarbonate, and the joint including one or more of an optically transparent resin and glycerin.

[0050]

[37] A first area capable of displaying an image and the design, wherein the L is measured by the SCI method at 10 different points on the first area using reflected light with the first area as the incident surface. ＊ The display system of any one of

[29] to

[36] , wherein the difference between the maximum and minimum values ​​of 10 measured values ​​for the total light transmittance is 0.1 or more and 9.0 or less, and the difference between the maximum and minimum values ​​of 25 measured values ​​for the total light transmittance of the decorative sheet, measured at 25 different locations, is 1% or more and 30% or less of the average value of the 25 measured values.

[0051]

[38] A second region other than the first region is included, and L is measured by an SCI method at 10 different points on the first region using reflected light with the first region as an incident surface. ＊ The display system of

[37] , wherein the difference between the maximum and minimum values ​​of the 10 measured values ​​is greater than or equal to 0.1 and less than or equal to 9.0.

[0052]

[39] A method for measuring the L value of a first area that can display an image and the design, the L value being measured by the SCE method at 10 different points on the first area using reflected light with the first area as the incident surface. ＊ The display system of any one of

[29] to

[36] , wherein the difference between the maximum and minimum values ​​of 10 measured values ​​for the total light transmittance is 0.1 or more and 9.0 or less, and the difference between the maximum and minimum values ​​of 25 measured values ​​for the total light transmittance of the decorative sheet, measured at 25 different locations, is 1% or more and 30% or less of the average value of the 25 measured values.

[0053]

[40] A second region other than the first region is included, and L is measured by an SCE method at 10 different points on the first region using reflected light with the first region as an incident surface. ＊The display system of

[39] , wherein the difference between the maximum and minimum values ​​of the 10 measured values ​​is greater than or equal to 0.1 and less than or equal to 9.0.

[0054] An embodiment will be described below with reference to the drawings. In the drawings, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of clarity and ease of understanding. Note that components shown in some drawings may be omitted in other drawings.

[0055] Terms such as "orthogonal" and "same" for specifying shapes and geometric conditions, as well as their degrees, and numerical values ​​such as angles are not limited to their strict meanings. These terms should be interpreted to include a range of degrees within which similar functions can be expected.

[0056] Directions common to the drawings are indicated by arrows with the same reference numerals in each drawing. In each direction, the tip of the arrow is the first side. In each direction, the side opposite the first side, i.e., the base of the arrow, is the second side. An arrow pointing from the front to the back of the paper in a direction perpendicular to the paper surface is indicated by a symbol with an X in a circle, as shown in FIG. 2, for example. An arrow pointing from the back to the front of the paper in a direction perpendicular to the paper surface is indicated by a symbol with a dot in a circle, as shown in FIG. 3, for example.

[0057] A plurality of candidates for the lower limit value of a certain parameter and a plurality of candidates for the upper limit value of the parameter may be listed. A candidate numerical range for the parameter is a combination of one of the plurality of candidates for the lower limit value and one of the plurality of candidates for the upper limit value. As an example, B1, B2, and B3 are listed as a plurality of candidates for the lower limit value of parameter A. B1, B2, and B3 are mutually different numerical values. C1, C2, and C3 are listed as a plurality of candidates for the upper limit value of parameter A. C1, C2, and C3 are mutually different numerical values. In this example, the candidates for the numerical range of parameter A are B1 or more and C1 or less, B1 or more and C2 or less, B1 or more and C3 or less, B2 or more and C1 or less, B2 or more and C2 or less, B2 or more and C3 or less, B3 or more and C1 or less, B3 or more and C2 or less, and B3 or more and C3 or less.

[0058] 1 to 6 are diagrams illustrating one embodiment. FIG. 1 is an exploded perspective view of a display system 1. The display system 1 shown in FIG. 1 includes a light-emitting device 10 and a decorative sheet 20 that overlaps the light-emitting device 10 in a first direction D1. The illustrated display system 1 also includes a pattern mask 15 that is positioned between the light-emitting device 10 and the decorative sheet 20 in the first direction D1. A display device 16 may be configured by the light-emitting device 10 and the pattern mask 15.

[0059] As shown in Fig. 4, the display system 1 is capable of displaying an image IM and a design D. The display system 1 displays the image IM using light emitted from a light-emitting device 10. In the illustrated display system 1, the display device 16 displays the image IM in a lit state in which the light-emitting device 10 is emitting light. The display system 1 also displays the design D using a decorative sheet 20. The illustrated display system 1 has a display surface 1a that displays the image IM and the design D.

[0060] The display system 1 shown in Fig. 4 has a first area A1 capable of displaying an image IM and a design D, and a second area A2 other than the first area A1. In the first area A1, the image IM is displayed when the light-emitting device 10 is in a lit state. In the first area A1, the design D is displayed when the light-emitting device 10 is in an off state where it has stopped emitting light. In the second area A2, the design D is displayed regardless of the state of the light-emitting device 10.

[0061] The display system 1 can be applied to various applications. The display system 1 may be applied to a mobile object. The mobile object is a movable device or equipment. The mobile object may include a vehicle such as an automobile. The mobile object may be an unmanned machine such as a drone.

[0062] The light-emitting device 10 can be in a lit state or an extinguished state. The state of the light-emitting device 10 may be controlled by an external control device (not shown). The light-emitting device 10 may include a light-emitting element such as a cold cathode fluorescent lamp or a light-emitting diode (LED). The light-emitting device 10 may include a surface light source device that emits light in a planar form. The light-emitting device 10 may be a communication device such as a mobile phone, a smartphone, a tablet, or a router. The light-emitting device 10 may be an image receiving device such as a television or a display.

[0063] 1 functions as a surface light source device and is capable of emitting light in a plane perpendicular to the first direction D1 when turned on. In other words, the illustrated light emitting device 10 has a light emitting surface 11 extending in a plane perpendicular to the first direction D1. The light emitting surface 11 has a longitudinal direction in a second direction D2 perpendicular to the first direction D1. The light emitting surface 11 has a width direction in a third direction D3 perpendicular to both the first direction D1 and the second direction D2.

[0064] In the display system 1 shown in FIG. 1 , a pattern mask 15 is disposed on the light-emitting surface 11 of the surface light source device. The pattern mask 15 shapes the light emitted from the light-emitting device 10. FIG. 3 shows an example of the pattern mask 15. The pattern mask 15 has a thickness direction in a first direction D1, a longitudinal direction in a second direction D2, and a width direction in a third direction D3. The thickness of the pattern mask 15 may be 1.0 μm or more, or 3.0 μm or more. The thickness of the pattern mask 15 may be 10 μm or less, or 5.0 μm or less. The illustrated pattern mask 15 has a transmissive region 151 and a light-blocking region 152.

[0065] The pattern mask 15 is capable of transmitting light from the light-emitting device 10 emitted from the light-emitting surface 11 in the transmissive region 151. The transmissive region 151 has the same shape as the image to be displayed by the display system 1. The transmissive region 151 shown in FIG. 3 has the shape of the alphabet "E," "C," or "O." The illustrated transmissive region 151 forms a string of characters using the three letters "E," "C," and "O." In other words, the illustrated display system 1 is intended to display the string "ECO" as an image. The transmissive region 151 is not limited to the illustrated example, and may have the shape of a figure, mark, pictogram, or the like depending on the image to be displayed.

[0066] 6 constitutes a gap AG between the light-emitting device 10 and the decorative sheet 20. Therefore, in the illustrated display system 1, a gap AG is provided between the light-emitting device 10 and the decorative sheet 20. Unlike the illustration, in the display system 1, a gap AG does not necessarily have to be provided between the light-emitting device 10 and the decorative sheet 20.

[0067] The pattern mask 15 has visible light blocking properties in the light-blocking region 152. In the display device 16 shown in FIG. 2 , light emitted from the light-emitting device 10 through the light-emitting surface 11 can be absorbed in the light-blocking region 152. The pattern mask 15 may include a binder resin and light-absorbing particles dispersed in the binder resin in the light-blocking region 152. The light-absorbing particles may include a black pigment such as carbon black or titanium black. The pattern mask 15 may include an optical interference pigment instead of the light-absorbing particles in the light-blocking region 152. The optical interference pigment may be, for example, an aluminum pigment or titanium dioxide-coated mica. The light-blocking region 152 may be formed by printing.

[0068] "Visible light blocking" means that the visible light transmittance is 1% or less, preferably 0.2% or less. The visible light transmittance is specified as the average value of the total light transmittance at each wavelength when measured in 1 nm increments within a wavelength range of 380 nm to 780 nm using a haze meter conforming to JIS K 7361-1:1997. When no particular transmission direction is specified, the angle of incidence when measuring the visible light transmittance is taken to be 0°. The angle of incidence is the angle between the normal to the incident surface and the traveling direction of the incident light, and is a value less than 90°.

[0069] A D65 light source is used to measure total luminous transmittance. Prior to measuring total luminous transmittance, the light source is turned on for 15 minutes. When measuring total luminous transmittance, the angle of incidence of light emitted from the D65 light source on the object to be measured is 0°. The test environment for measuring total luminous transmittance is a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The object to be measured for total luminous transmittance is placed in the test environment for 16 hours before starting the test. Other measurement conditions for measuring total luminous transmittance are in accordance with JIS K 7361-1:1997. Note that "total luminous transmittance" is a percentage value in the unit %.

[0070] The pattern mask 15 shown in FIG. 3 has an opening region 15X. The opening region 15X has the same shape as the transmission region 151. That is, light emitted from the light-emitting device 10 can transmit through the opening region 15X. The opening region 15X may be formed by removing the light-shielding region 152. The light-shielding region 152 may be removed by various methods, such as laser etching. When the light-shielding region 152 is formed by printing, the composition forming the light-shielding region 152 does not need to be printed in the portion where the opening region 15X is to be formed. That is, the pattern mask 15 may be formed by pattern printing. Light emitted from the light-emitting device 10 can be blocked in regions of the pattern mask 15 other than the opening region 15X. As a result, as shown in FIG. 4, a display system 1 including the light-emitting device 10 in a lit state can display an image having the same shape as the opening region 15X.

[0071] In the display system 1 shown in Figures 1 and 2, the decorative sheet 20 overlaps the display device 16 from a first side in a first direction D1. In the illustrated display system 1, the first direction D1 is the stacking direction of the light-emitting device 10 and the decorative sheet 20, or the display device 16 and the decorative sheet 20. The illustrated decorative sheet 20 has a thickness direction in the first direction D1. The decorative sheet 20 extends in a direction perpendicular to the first direction D1. The decorative sheet 20 has a longitudinal direction in a second direction D2 and a width direction in a third direction D3.

[0072] The decorative sheet 20 shown in Figures 2 and 4 has a first surface 20a and a second surface 20b that face each other in the thickness direction of the decorative sheet 20. The illustrated display system 1 can be observed from the first surface 20a of the decorative sheet 20. The illustrated first surface 20a can form the display surface 1a of the display system 1. The illustrated decorative sheet 20 is overlaid on the display device 16 from the second surface 20b. The illustrated decorative sheet 20 is overlaid on the light-emitting device 10 from the second surface 20b.

[0073] The decorative sheet 20 displays a design D. The design D is observable from the first surface 20a. By displaying the design D on the decorative sheet 20, the light-emitting device 10 or the display device 16 can be concealed when the display system 1 is observed from the stacking direction. When the illustrated display system 1 is observed from the first side in the first direction D1, the light-emitting device 10 and the pattern mask 15 can be concealed by the decorative sheet 20.

[0074] The decorative sheet 20 is capable of transmitting light emitted from the light emitting device 10. The decorative sheet 20 shown in Fig. 2 is capable of transmitting light incident from the second surface 20b. The decorative sheet 20 has a total light transmittance sufficient to transmit light emitted from the light emitting device 10. The decorative sheet 20 shown in Figs. 1 and 2 is capable of transmitting light emitted from the light emitting device 10 and shaped by the pattern mask 15. The light transmitted through the decorative sheet 20 can be observed when the illustrated display system 1 is observed from a first side in a first direction D1, as shown in Fig. 4.

[0075] From the viewpoint of stably concealing the light emitting device 10 or the display device 16, a lower limit may be set for the thickness of the decorative sheet 20. The decorative sheet 20 may have a thickness of 12 μm or more, or may have a thickness of 50 μm or more. From the viewpoint of stably displaying the light emitted from the light emitting device 10, an upper limit may be set for the thickness of the decorative sheet 20. The decorative sheet 20 may have a thickness of 1000 μm or less, or may have a thickness of 500 μm or less.

[0076] From the viewpoint of stably concealing the light-emitting device 10 or the display device 16, an upper limit may be set for the total light transmittance of the decorative sheet 20. The total light transmittance of the decorative sheet 20 may be 50% or less, or 30% or less. Furthermore, if the total light transmittance exceeds 50%, as the proportion of transmitted light increases, the light reflected by the design layer decreases, making the design less visible, and thus the design may be degraded. From the viewpoint of stably displaying the light emitted from the light-emitting device 10, a lower limit may be set for the total light transmittance of the decorative sheet 20. The total light transmittance of the decorative sheet 20 may be 8% or more, 10% or more, 13% or more, 18% or more, or 20% or more. The total light transmittance of the decorative sheet 20 is measured by the method described above. If the total light transmittance is 5% or less, the light output of the light-emitting device 10 needs to be increased to make the light emitted from the light-emitting device 10 more visible, which results in the drawback of increased power consumption.

[0077] 5 and 6 includes decorative portions 21 that form the design D and non-decorative portions 22 that do not form the design D. The illustrated decorative sheet has a plurality of non-decorative portions 22. In the display system 1 shown in FIG. 1 and other figures, the dimensions of each non-decorative portion 22 are significantly smaller than the dimensions of the display surface 1a in a direction non-parallel to the first direction D1. As a result, the display system 1 is observed as if the design D formed by the decorative portions 21 is displayed on the entire display surface 1a.

[0078] The decorative sheet 20 may transmit visible light in the non-decorative portion 22 to an extent that the non-decorative portion 22 can be distinguished from the decorative portion 21. The decorative sheet 20 may be transparent in the non-decorative portion 22. The decorative sheet 20 may not be transparent in the non-decorative portion 22. The illustrated decorative sheet 20 is capable of transmitting light emitted from the display device 16 in the non-decorative portion 22.

[0079] When a component of the display system 1 is "transparent," the visible light transmittance of the component is 50.0% or more. When a component of the display system 1 is "transparent," the visible light transmittance of the component may be 80.0% or more, or may be 90.0% or more. The visible light transmittance of the component of the display system 1 is measured by the method described above.

[0080] 5 includes a first portion 20X including a plurality of regularly arranged non-decorative portions 22. The "arrangement" of the plurality of non-decorative portions 22 means that the plurality of non-decorative portions 22 are arranged at intervals in a direction perpendicular to the stacking direction of the decorative sheet 20.

[0081] The non-decorative portions 22 may be regularly arranged two-dimensionally in the first portion 20X. The non-decorative portions 22 being "two-dimensionally arranged" means that the non-decorative portions 22 are arranged in two directions that are non-parallel to each other.

[0082] The decorative sheet 20 in Fig. 5 includes only a first portion 20X. In other words, in the illustrated decorative sheet 20, a plurality of non-decorative portions 22 are regularly arranged two-dimensionally throughout the entire decorative sheet 20. Unlike the illustrated example, the decorative sheet 20 may include a first portion 20X and a second portion 20Y that does not include a non-decorative portion 22.

[0083] The illustrated first portion 20X of the decorative sheet 20 is disposed in the first area A1 of the display system 1. The first portion 20X of the decorative sheet 20 may be disposed in the second area A2 of the display system 1. In place of the first portion 20X of the decorative sheet 20, the second portion 20Y may be disposed in the second area A2 of the display system 1.

[0084] In the decorative sheet 20 shown in FIG. 6 , the plurality of non-decorative portions 22 are regularly arranged two-dimensionally in the second direction D2 and the third direction D3. The illustrated non-decorative portions 22 are arranged in a grid pattern in the second direction D2 and the third direction D3. The illustrated non-decorative portions 22 have a circular shape when observed from the first direction D1. The shape of the non-decorative portions 22 is not limited to a circular shape. The non-decorative portions 22 may have an elliptical shape or a polygonal shape. Unlike the illustrated example, the regularly arranged non-decorative portions 22 may be connected to each other. In the first portion 20X, the plurality of non-decorative portions 22 do not have to be arranged two-dimensionally. As an example, each of the plurality of non-decorative portions 22 may be arranged between linearly extending decorative portions 21 in the first portion 20X. The non-decorative portions 22 arranged between the decorative portions 21 may also extend linearly.

[0085] 6 includes a base layer 23, a bonding layer 26, and a surface layer 27 in this order from the second surface 20b to the first surface 20a in the non-decorative portion 22. The decorative sheet 20 includes a base layer 23, a light-shielding layer 24, a design layer 25, a bonding layer 26, and a surface layer 27 in this order from the second surface 20b to the first surface 20a in the decorative portion 21. The light-shielding layer 24 and the design layer 25 may be removed in the non-decorative portion 22.

[0086] 6 are stacked in a first direction D1, which is the direction in which the layers of the decorative sheet 20 are stacked.

[0087] In the decorative sheet 20 shown in Fig. 6, the base layer 23 is located closest to the second side in the first direction D1. The base layer 23 forms the second surface 20b of the decorative sheet 20. The base layer 23 supports the layers of the decorative sheet 20 other than the base layer 23. The base layer 23 may be colored. The base layer 23 may be transparent.

[0088] A lower limit may be set for the thickness of the base layer 23 from the viewpoint of stably supporting other components of the decorative sheet 20. The thickness of the base layer 23 may be 12 μm or more, or 50 μm or more. From the viewpoint of suppressing the thickness of the decorative sheet 20 and stably displaying the light emitted from the light-emitting device 10, the thickness of the base layer 23 may be 1000 μm or less, or 500 μm or less.

[0089] The substrate layer 23 shown in Fig. 6 is a sheet extending in the second direction D2 and the third direction D3. The substrate layer 23 is capable of transmitting light emitted from the display device 16. The substrate layer 23 may be a resin sheet. The substrate layer 23 may include a thermoplastic resin as a material. The thermoplastic resin included in the substrate layer 23 may include one or more of acrylic, polyolefin resins such as PET (polyethylene terephthalate), polypropylene, and polyethylene, polycarbonate, ABS (acrylonitrile-butadiene-styrene copolymer synthetic resin), polypropylene, and triacetyl cellulose.

[0090] In the decorative sheet 20 shown in Fig. 6, the light-shielding layer 24 is located in the decorative portion 21. The light-shielding layer 24 is not located in the non-decorative portion 22. The light-shielding layer 24 is located between the base layer 23 and the design layer 25 in the first direction D1. The light-shielding layer 24 has a thickness direction in the first direction D1.

[0091] The light-shielding layer 24 has a visible light-shielding property. By having a visible light-shielding property, the light-shielding layer 24 can absorb light that is incident on the decorative sheet 20 from the second surface 20b. The light-shielding layer 24 can absorb light emitted from the light-emitting device 10. The light-shielding layer 24 may include a binder resin and light-absorbing particles dispersed in the binder resin. The light-absorbing particles may include a black pigment such as carbon black or titanium black. The light-shielding layer 24 may include an optical interference pigment instead of the light-absorbing particles. The optical interference pigment may be, for example, an aluminum pigment.

[0092] From the viewpoint of ensuring sufficient visible light blocking properties, a lower limit may be set for the thickness of the light-blocking layer 24. The thickness of the light-blocking layer 24 may be 1 μm or more, or 5 μm or more. From the viewpoint of suppressing the thickness of the decorative sheet 20 and stably displaying the light emitted from the light-emitting device 10, an upper limit may be set for the thickness of the light-blocking layer 24. The thickness of the light-blocking layer 24 may be 20 μm or less, or 10 μm or less.

[0093] 6, the design layer 25 is located in the decorative portion 21. The design layer 25 is not located in the non-decorative portion 22. The design layer 25 is located between the light-shielding layer 24 and the bonding layer 26 in the first direction D1.

[0094] The design layer 25 has a design D. The design D may include a pattern P, as shown in Figures 1 and 3. The pattern P emphasizes the design D. By emphasizing the design D, the added value of the decorative sheet 20 can be improved and the range of application of the decorative sheet 20 can be expanded.

[0095] The pattern P may include a wood grain pattern or a stone grain pattern. The pattern P may include a geometric pattern formed by a pattern. The design D may include one or more of a figure, a design, a color, a picture, a photograph, a character, a mark, a pictogram, letters, numbers, or other images. The design D may not include the pattern P. As an example, the design D may display only a single color.

[0096] The design layer 25 may be formed by applying ink to the sheet that forms the base layer 23. The ink may be colored any of cyan (C), magenta (M), yellow (Y), black (K), white, and silver. The ink may be applied to the sheet by various methods such as gravure printing, screen printing, offset printing, and inkjet printing. Specific methods for forming the design layer 25 in the decorative sheet 20 will be described later.

[0097] Ink colored cyan (C) may be described as cyan ink. Ink colored magenta (M) may be described as magenta ink. Ink colored yellow (Y) may be described as yellow ink. Ink colored black (K) may be described as black ink. Ink colored white may be described as white ink. Ink colored silver may be described as silver ink.

[0098] The cyan ink may contain a phthalocyanine pigment. The magenta ink may contain one or more of a quinacridone pigment and a monoazo pigment. The yellow ink may contain one or more of an azo pigment, a benzimidazolone pigment, and an isoindolinone. The black ink may contain carbon black. The white ink may contain titanium dioxide. The silver ink may contain an aluminum pigment.

[0099] When design D includes multiple colors, multiple inks displaying different colors may be arranged according to design D in design layer 25. When design D includes pattern P, design layer 25 may be formed by applying multiple types of inks displaying different colors onto a sheet. When design D includes only a single color, design layer 25 may be formed by applying a single ink to a uniform thickness onto a sheet.

[0100] The design layer 25 may include a binder resin and a colorant dispersed within the binder resin. The colorant may be a dye, a pigment, or a combination of a dye and a pigment. When the ink used to form the design layer 25 is colored any of cyan (C), magenta (M), yellow (Y), and black (K), the dye may be an organic dye. When the ink used to form the design layer 25 is colored any of cyan (C), magenta (M), yellow (Y), and black (K), the pigment may be an organic pigment or an inorganic pigment.

[0101] The pigment contained in the design layer 25 may include one or more of a phthalocyanine pigment, a quinacridone pigment, a monoazo pigment, an azo pigment, a benzimidazolone pigment, carbon black, and an aluminum pigment.

[0102] The pigment contained as a colorant in the design layer 25 may be an interference pigment. An interference pigment is a pigment that displays a color through the interference of reflected light in the pigment. When the design layer 25 contains an interference pigment as a colorant, the design layer 25 may display any of the colors red (R), green (G), and blue (B), or a combination of these colors. An interference pigment for displaying red (R) may be described as a red interference pigment. An interference pigment for displaying green (G) may be described as a green interference pigment. An interference pigment for displaying blue (B) may be described as a blue interference pigment. The interference pigment may include an aluminum pigment or titanium dioxide-coated mica. In the design layer 25, the interference pigment may be used alone. In the design layer 25, the interference pigment may be used in combination with the above-mentioned organic pigments or inorganic pigments.

[0103] The design D can be composed of a combination of multiple different colors. The decorative sheet 20 can display different colors depending on the position because the design layer 25 has the design D. In particular, when the design layer 25 has a pattern P as the design D, it can display different colors depending on the position. As a result, the amount of reflected light on the first surface 20a of the decorative sheet 20 can change depending on the design D. In addition, the amount of transmitted light through the decorative sheet 20 can change depending on the design D.

[0104] The design layer 25 may be formed by printing. The design layer 25 may be formed by transfer. From the viewpoint of stably displaying the design D, a lower limit may be set for the thickness of the design layer 25. From the viewpoint of suppressing the thickness of the decorative sheet 20 and stably displaying the light emitted from the light emitting device 10, an upper limit may be set for the thickness of the design layer 25. The thickness of the design layer 25 may be 1 μm or more and 30 μm or less.

[0105] 6, the decorative sheet 20 may have an uneven surface 30. The uneven surface 30 shown in the figure includes a plurality of convex portions 31 aligned in the second direction D2. The convex portions 31 shown in the figure are located in the decorative portion 21. The convex portions 31 shown in the figure are formed by a light-shielding layer 24 and a design layer 25. The light-shielding layer 24 and the design layer 25 protrude further toward the first side in the first direction D1 than the base layer 23, thereby forming the convex portions 31.

[0106] 6 , the bonding layer 26 is located between the base layer 23 and the surface layer 27 in the first direction D1. In the decorative portion 21 of the illustrated decorative sheet 20, the bonding layer 26 is located between the design layer 25 and the surface layer 27 in the first direction D1. The bonding layer 26 improves adhesion between different layers of the decorative sheet 20.

[0107] The bonding layer 26 may be a sheet. The bonding layer 26 shown in Fig. 6 is a sheet having a first surface 26a and a second surface 26b opposite the first surface 26a. The illustrated bonding layer 26 is in contact with the surface layer 27 at the first surface 26a. The illustrated bonding layer 26 is in contact with one or more of the light-shielding layer 24, the design layer 25, and the base material layer 23 at the second surface 26b.

[0108] The bonding layer 26 may include an adhesive material. The adhesive material included in the bonding layer 26 may be any of an acrylic adhesive material, a rubber adhesive material, a urethane adhesive material, and a silicone adhesive material. The bonding layer 26 may also include a thermal adhesive material. Examples of the thermal adhesive material include acrylic resin.

[0109] The bonding layer 26 may include an optically transparent resin. The optically transparent resin is a transparent material. The bonding layer 26 may include an optically clear resin (OCR) or an optically clear adhesive (OCA) as the optically transparent resin. When evaluating the combination with a display, glycerin may be used instead of OCA. Glycerin has a refractive index close to that of OCA and is highly reworkable, allowing for efficient evaluation.

[0110] 6 overlaps the uneven surface 30 of the decorative sheet 20 from the first direction D1. The illustrated bonding layer 26 contacts the uneven surface 30 from the second surface 26b. The bonding layer 26 may reduce the height difference of the uneven surface 30. In other words, the bonding layer 26 may fill the height difference of the uneven surface 30. In the illustrated bonding layer 26, the height difference on the first surface 26a opposite to the surface contacting the uneven surface 30 is smaller than the height difference on the second surface 26b.

[0111] The bonding layer 26 shown in Fig. 6 is capable of transmitting light emitted from the display device 16. From the viewpoint of displaying a clear image using light from the display device 16, the bonding layer 26 may be transparent. The visible light transmittance of the bonding layer 26 may be 80% or more, 90% or more, 95% or more, or 99% or more. The visible light transmittance of the bonding layer 26 is measured by the method described above.

[0112] 6, the surface layer 27 forms the first surface 20a of the decorative sheet 20. That is, the surface layer 27 forms the outer surface of the display system 1. The surface layer 27 may be a sheet.

[0113] The surface layer 27 may contain a thermoplastic resin as a material. The thermoplastic resin contained in the surface layer 27 may include one or more of acrylic, PET (polyethylene terephthalate), polyolefin resins such as polypropylene and polyethylene, polycarbonate, ABS (acrylonitrile-butadiene-styrene copolymer synthetic resin), polyvinyl chloride (PVC), polyvinylidene chloride (PVDF), polyetherimide (PEI), polyimide (PI), and polytetrafluoroethylene (PTFE). The sheet constituting the surface layer 27 may be used as the sheet constituting the base layer 23. The sheet constituting the base layer 23 may be used as the sheet constituting the surface layer 27. The surface layer 27 may be transparent.

[0114] A lower limit may be set for the thickness of the surface layer 27. The thickness of the surface layer 27 may be 8 μm or more, or 25 μm or more. An upper limit may be set for the thickness of the surface layer 27. The thickness of the surface layer 27 may be 3000 μm or less, or 500 μm or less.

[0115] An example of a method for manufacturing the decorative sheet 20 shown in FIG. 6 will be described.

[0116] A sheet forming the base layer 23 is prepared. A light-shielding layer 24 is provided on one surface of this sheet. In providing the light-shielding layer 24, a resin composition containing the binder resin and light-absorbing particles described above may be applied to one surface of the sheet. The applied resin composition may be dried to form the light-shielding layer 24.

[0117] Next, the design layer 25 is provided on the light-shielding layer 24. The design layer 25 may be formed as a printed layer by printing a resin composition containing the above-mentioned binder resin and colorant on the light-shielding layer 24. The design layer 25 may be transferred onto the light-shielding layer 24 as a transfer layer.

[0118] The non-decorative portion 22 is formed in a laminate including a base layer 23, a light-shielding layer 24, and a design layer 25. The light-shielding layer 24 and the design layer 25 may be removed in the portion forming the non-decorative portion 22. The light-shielding layer 24 and the design layer 25 may be removed by various methods such as laser etching and sandblasting. By partially removing the light-shielding layer 24 and the design layer 25, an uneven surface 30 is formed.

[0119] The laser etching may be performed by a laser emitted from a laser irradiation device. The plurality of non-decorative portions 22 may be formed on the laminate by moving the laser irradiation position. The laser irradiation position may be moved by moving the laminate relative to the laser irradiation device. The laser irradiation position may be moved by moving the laser irradiation device relative to the laminate.

[0120] A bonding layer 26 is overlaid on a laminate including a base layer 23, a light-shielding layer 24, and a design layer 25. The bonding layer 26 is overlaid on the uneven surface 30 of the laminate. The laminate including the base layer 23, the light-shielding layer 24, the design layer 25, and the bonding layer 26 may be placed in an autoclave. As a result of pressurizing the laminate in the autoclave, the uneven surface 30 may be filled with the bonding layer 26.

[0121] The surface layer 27 is overlaid on the bonding layer 26. The surface layer 27 may be bonded to the bonding layer 26. In this manner, the decorative sheet 20 shown in Fig. 6 is produced.

[0122] The operation of the illustrated display system 1 will now be described.

[0123] When the light emitting device 10 is turned on, it emits light from its light emitting surface 11. The light emitted from the light emitting surface 11 is directed toward the pattern mask 15. Light emitted from the light emitting device 10 and reaching the transmissive region 151 is transmitted through the pattern mask 15. Light emitted from the light emitting device 10 and reaching the light-shielding region 152 is absorbed by the pattern mask 15. In this way, the pattern mask 15 shapes the light emitted from the light emitting device 10. The light transmitted through the pattern mask 15 is directed toward the decorative sheet 20.

[0124] Light that has passed through the pattern mask 15 enters the decorative sheet 20 from the second surface 20b. In the decorative sheet 20 shown in Fig. 6, light that reaches the non-decorative portion 22 passes through the decorative sheet 20. Specifically, light that has reached the non-decorative portion 22 passes from the second surface 20b through the base material layer 23, the bonding layer 26, and the surface layer 27, reaches the first surface 20a, and is emitted from the first surface 20a, i.e., the display surface 1a of the display system 1. In the decorative sheet 20 shown in Fig. 6, light that has reached the decorative portion 21 is absorbed by the light-shielding layer 24.

[0125] The light emitted from the display surface 1a increases the brightness in the first region A1 of the display system 1. The light emitted from the display surface 1a makes the brightness in the first region A1 greater than the brightness in the second region A2. As the brightness in the first region A1 becomes greater than the brightness in the second region A2, an image IM becomes observable in the first region A1. In the illustrated display system 1, the character string "ECO" becomes observable as the image IM in the first region A1.

[0126] The decorative sheet 20 in FIG. 6 overlaps the transmissive region 151 of the pattern mask 15 in the first portion 20X. In other words, the decorative sheet 20 includes a portion of the non-decorative portion 22 that overlaps with the transmissive region 151 of the pattern mask 15. The dimensions of the non-decorative portion 22 are significantly smaller than the dimensions of the transmissive region 151 in a direction non-parallel to the first direction D1. The transmissive region 151 overlaps with many non-decorative portions 22 in the first direction D1. As a result, light transmitted through the pattern mask 15 reaches many non-decorative portions 22 and is emitted from many non-decorative portions 22. In the first region A1, the display system 1 can emit light having a shape similar to that of the transmissive region 151 from the display surface 1a as an image IM. Specifically, as shown in FIGS. 3 and 4 , the display system 1 can display an image IM having the shape of the character string "ECO," similar to the transmissive region 151.

[0127] The decorative sheet 20 in Fig. 6 also includes a portion of the decorative portion 21 that overlaps with the transmissive region 151 of the pattern mask 15. As a result, in the display system 1 in Fig. 4, when the light-emitting device 10 is in a lit state, both the image IM and the design D can be observed in the first region A1.

[0128] When the light-emitting device 10 is in an off state, it stops emitting light from the light-emitting surface 11. In the display system 1 including the light-emitting device 10 in an off state, the design D is displayed in both the first area A1 and the second area A2. The design D can conceal the display device 16. The design D allows the display system 1 to be installed while ensuring harmony and uniformity with the surrounding environment.

[0129] In order to clearly display the design D, in the light-emitting device 10 in the turned-off state, L ＊ An upper limit may be set for the value. ＊ a ＊ b ＊ L in color system ＊ The value may be 45.0 or less, 40.0 or less, or 37.0 or less when measured by the SCI method using reflected light with the light emitting surface 11 as the incident surface. ＊ a ＊ b ＊L in color system ＊ The value may be 20.0 or less, 15.0 or less, 5.0 or less, or 4.0 or less, when measured by the SCE method using reflected light with the light emitting surface 11 as the incident surface. ＊ By providing such a lower limit for the value, the design D can be stably displayed regardless of the total light transmittance of the decorative sheet 20, as shown by the results of the following experiment.

[0130] First, decorative sheets according to Samples 1 to 4 were prepared. Each sample included a design layer and a base layer, in this order from the first surface to the second surface. Each sample included a decorative portion and a non-decorative portion. In each sample, the design layer had a third wood grain pattern, as described below, as a design. The total light transmittance of the decorative sheet according to Sample 1 was 20%. The total light transmittance of the decorative sheet according to Sample 2 was 30%. The total light transmittance of the decorative sheet according to Sample 3 was 40%. The total light transmittance of the decorative sheet according to Sample 4 was 50%. That is, the total light transmittance of the decorative sheets increased in the following order: Sample 4, Sample 3, Sample 2, and Sample 1. The diameters of the non-decorative portions of the decorative sheets according to Samples 1 to 4 were different from one another.

[0131] Next, a black sheet was placed on the second surface of each sample. The black sheet was placed between the support surface and the decorative sheet. The support surface supported the decorative sheet and the black sheet. ＊ The value was 28.0 when measured by the SCI method. ＊ In this state, the L value was 14.0 when measured by the SCE method. ＊ The value was measured. ＊ The values ​​were measured by the SCI method and the SCE method, respectively.

[0132] Next, a white sheet was placed on the second surface of each sample in place of the black sheet. The white sheet was placed between the supporting surface and the decorative sheet. The supporting surface supported the decorative sheet and the white sheet. ＊The value was 94.0 when measured by the SCI method. ＊ In this state, the L value was 93.4 when measured by the SCE method. ＊ The value was measured. ＊ The values ​​were measured by the SCI method and the SCE method, respectively.

[0133] L of each sample, black sheet and white sheet ＊ The values ​​were measured using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. ＊ In measuring the values, the measurement wavelength range of the spectrophotometer was 400 nm to 700 nm, and the measurement wavelength interval was 10 nm. The measurement mode of the spectrophotometer was "I+E (SCI+SCE)" in the spectrophotometer. The L values ​​of each sample, black sheet, and white sheet were measured in the spectrophotometer. ＊ The color system used for measuring the value is L ＊ a ＊ b ＊ The L of each sample, black sheet, and white sheet was measured using a spectrophotometer. ＊ The color difference formula when measuring the value is delta E ＊ The L of each sample, black sheet and white sheet was ＊ In measuring the values, the viewing angle of the spectrophotometer was 10°. ＊ In measuring the values, the observation light source of the spectrophotometer was the D65 light source. ＊ In measuring the values, the measurement diameter of the spectrophotometer was 8 mm, and the illumination diameter of the spectrophotometer was 11 mm.

[0134] L using the SCI method for each sample ＊ The results of the measurement of the L value are shown in Table 1 below. ＊The measurement results of the values ​​are shown in Table 2 below. "Black sheet (SCI)" in Table 1 and "Black sheet (SCE)" in Table 2 respectively refer to the measurement results when a black sheet is placed on each sample. "White sheet (SCI)" in Table 1 and "White sheet (SCE)" in Table 2 respectively refer to the measurement results when a white sheet is placed on each sample.

[0135]

[0136]

[0137] As shown in Table 1, when the measurement results are arranged in the order of Sample 1, Sample 2, Sample 3, and Sample 4, the numerical value in the "Black Sheet (SCI)" column is suppressed from increasing compared to the numerical value in the "White Sheet (SCI)" column. As shown in Table 2, when the measurement results are arranged in the order of Sample 1, Sample 2, Sample 3, and Sample 4, the numerical value in the "Black Sheet (SCE)" column is suppressed from increasing compared to the numerical value in the "White Sheet (SCE)" column. In other words, in the decorative sheet superimposed on the black sheet, the increase in L ＊ Therefore, the light emitting device 10 disposed on the second surface 20b side is ＊ When the above-mentioned condition regarding the upper limit of the value is satisfied, the display system 1 can stably display the design D regardless of the total light transmittance of the decorative sheet 20 .

[0138] In the light-emitting device 10 in the off state, L ＊ The lower limit of the value is not particularly limited. ＊ a ＊ b ＊ L in color system ＊ The value may be 25.0 or more, 26.0 or more, or 30.0 or more when measured by the SCI method using reflected light with the light emitting surface 11 as the incident surface. ＊ a ＊ b ＊ L in color system ＊ The value may be 0.2 or more, 0.8 or more, or 1.0 or more when measured by the SCE method using reflected light with the light emitting surface 11 as the incident surface.

[0139] A display system including a light-emitting device and a decorative sheet overlaid on the light-emitting device may be irradiated with external light depending on the installation environment. In the display system, the external light may be irradiated onto a display surface that displays an image and a design. On the display surface, the external light may be irradiated onto both a first region that displays an image and a second region other than the first region. The external light irradiated onto the display surface may be reflected by the display surface formed by the decorative sheet, regardless of whether it is the first region or the second region. The external light irradiated onto the display surface may be reflected at the interface between the decorative sheet and the light-emitting device, regardless of whether it is the first region or the second region, and may be re-emitted from the display surface. Therefore, the external light increases the luminance on the display surface of the display system, regardless of whether it is the first region or the second region. As a result, the increase in luminance in both the first region and the second region may reduce the contrast between the first region and the second region in a display system illuminated by external light, which may deteriorate the visibility of the image.

[0140] The design of the decorative sheet can affect the visibility of the image in the display system. ＊ a ＊ b ＊ L in color system ＊ Therefore, the inventors of the present invention have found that when the L value of the decorative sheet is below a predetermined threshold, the increase in luminance on the display surface is suppressed. ＊ It was found that the upper limit of the L value of the decorative sheet can be set. ＊ The value is measured by reflected light with the surface on which the decorative sheet is observed as the incident surface. "Reflected light with the surface on which the decorative sheet is observed as the incident surface" includes light that enters the decorative sheet from the surface on which the decorative sheet is observed, is reflected inside the decorative sheet, and is emitted from the surface.

[0141] In the decorative sheet 20 shown in FIGS. ＊ a ＊ b ＊ L in color system ＊ The upper limit of the value is set. ＊The value is measured by reflected light with the first surface 20a as the incident surface. "Reflected light with the first surface 20a as the incident surface" includes light that enters the interior of the decorative sheet 20 from the first surface 20a, is reflected within the decorative sheet 20, and is emitted from the first surface 20a. The light that enters the interior of the illustrated decorative sheet 20 may be reflected at the interface between the design layer 25 and the bonding layer 26. The light reflected at the interface between the design layer 25 and the bonding layer 26 may be emitted from the first surface 20a as "reflected light with the first surface 20a as the incident surface."

[0142] L of the decorative sheet 20 ＊ a ＊ b ＊ L in color system ＊ The value may be measured by the SCI method. ＊ The value may be 45.0 or less, 43.0 or less, 40.0 or less, 39.0 or less, 35.0 or less, 34.0 or less, 30.0 or less, 29.0 or less, 28.0 or less, or 27.0 or less. ＊ The lower limit of the L value is not particularly limited. ＊ The value may be 25.0 or more. The "SCI method" is a measurement method that includes the component of reflected light that is specularly reflected from the decorative sheet 20 in the measurement target.

[0143] L of the decorative sheet 20 ＊ a ＊ b ＊ L in color system ＊ The value may be measured by the SCE method. ＊ The value may be 29.5 or less, 27.0 or less, 21.0 or less, 18.0 or less, 11.0 or less, 10.0 or less, or 6.5 or less. ＊ There is no particular limitation on the lower limit of the L ＊The value may be 5.0 or more. The "SCE method" is a measurement method in which the component of light reflected by the decorative sheet 20 as a specular reflection is excluded from the measurement target.

[0144] L of the decorative sheet 20 ＊ The value is measured using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. ＊ In measuring the L value, the measurement wavelength range of the spectrophotometer is 400 nm to 700 nm, and the measurement wavelength interval is 10 nm. The measurement mode of the spectrophotometer is the specular reflection light processing mode "I+E (SCI+SCE)". ＊ The color system used for measuring the value is L ＊ a ＊ b ＊ The L of the decorative sheet 20 is measured using a spectrophotometer. ＊ The color difference formula when measuring the value is delta E ＊ ab. L of the decorative sheet 20 ＊ In measuring the L value, the viewing angle of the spectrophotometer is 10°. ＊ In measuring the L value, the observation light source of the spectrophotometer is a D65 light source. ＊ In measuring the L value, the measurement diameter of the spectrophotometer is 8 mm. ＊ In measuring the values, the illumination diameter of the spectrophotometer is set to 11 mm.

[0145] L of the decorative sheet 20 ＊ The value is measured using the decorative sheet 20 attached from the second surface 20b to the outer peripheral surface of a black cylinder (a zero calibration box attached to the CM-700d manufactured by Konica Minolta, Inc.). ＊ The L value of the decorative sheet 20 is measured by pressing the above-mentioned spectrophotometer perpendicularly against the first surface 20a of the decorative sheet 20 in this state from the normal direction of the outer peripheral surface at the measurement position. ＊ The value is determined as the average value of measurements taken at five different locations on the first surface 20a.

[0146] L of the decorative sheet 20 ＊The value may be adjusted by adjusting the color material contained in the design layer 25. ＊ The value may be adjusted by adjusting the thickness of the design layer 25. ＊ The value may be adjusted by adjusting the design D of the design layer 25. For example, when the design D includes a pattern P, the L ＊ Depending on the value, a pattern P included in the design D may be selected.

[0147] Furthermore, the L measured by the reflected light with the first surface 20a as the incident surface is ＊ Instead of the value, L ＊ In the decorative sheet 20, the ratio of the L measured by the SCI method to the total light transmittance may be set to an upper limit. ＊ In the decorative sheet 20, the ratio of the L measured by the SCE method to the total light transmittance may be set to an upper limit. ＊ An upper limit may be set on the ratio of the values.

[0148] In the decorative sheet 20, the L measured by the SCI method using reflected light with the first surface 20a as the incident surface with respect to the total light transmittance. ＊ The ratio of the L value to the total light transmittance may be 1.5 or less, 1.3 or less, 1.1 or less, or 0.9 or less. ＊ The ratio of the values ​​may be 0.5 or more, 0.6 or more, 0.7 or more, or 0.8 or more.

[0149] In the decorative sheet 20, the L measured by the SCE method using reflected light with the first surface 20a as the incident surface with respect to the total light transmittance. ＊ The ratio of the values ​​may be 1.0 or less, 0.9 or less, 0.8 or less, 0.6 or less, or 0.4 or less. In the decorative sheet 20, the ratio of the L measured by the SCE method using reflected light with the first surface 20a as the incident surface to the total light transmittance is ＊ The ratio of the values ​​may be 0.1 or more, 0.2 or more, 0.3 or more, or 0.4 or more.

[0150] In the display system 1 in Fig. 4, when the light emitting device 10 is in a lighted state, both the image IM and the design D can be observed in the first area A1. As described above, the design D is configured by a combination of a plurality of different colors, so that the amount of light reflected on the first surface 20a of the decorative sheet 20 can change depending on the design D. Specifically, the L ＊ The measured value of the L value may vary depending on the measurement position when measured by the SCI method using reflected light with the first surface 20a as the incident surface. ＊ The measured value of the value may vary depending on the measurement position when measured by the SCE method using reflected light with the first surface 20a as the incident surface.

[0151] 4, in the portion located in the first area A1 of the first surface 20a, the amount of reflected light described above changes depending on the design D, so that the design D can be observed to be more prominent than the image IM. In the illustrated display system 1, the image quality of the image IM can be degraded because the design D is observed to be more prominent in the first area A1.

[0152] Furthermore, since the design layer 25 is configured as a combination of multiple different colors, the amount of light transmitted through the decorative sheet 20 can change depending on the design D. Specifically, the measured value of the total light transmittance of the decorative sheet 20 can change depending on the measurement position. For example, the measured value of the total light transmittance of the decorative sheet 20 can decrease at a measurement position where the design layer 25 displays a dark color.

[0153] 4, in the portion located in the first area A1 of the first surface 20a, the amount of transmitted light varies depending on the design D, so that the design D can be observed to be more prominent than the image IM. In the illustrated display system 1, the image quality of the image IM can be degraded by the design D being observed to be more prominent in the first area A1.

[0154] The present inventors have found that when the combination of conditions (A) and (C) or the combination of conditions (B) and (C) is satisfied, it is possible to prevent the design D from being conspicuously observed in the first area A1. The conditions (A), (B), and (C) are as follows: L in the conditions (A) and (B) ＊ The "maximum" and "minimum" values ​​are respectively ＊ a ＊ b ＊ L in color system ＊ These are the maximum and minimum values ​​among the 10 measured values. ＊ a ＊ b ＊ L in color system ＊ The ten measured values ​​for the (A):L value are measured at ten different points on the first surface 20a of the decorative sheet 20. ＊ The difference between the maximum and minimum values ​​of the L value is 9.0 or less when measured by the SCI method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface. ＊ (C): The difference between the maximum and minimum values ​​of the total light transmittance is 9.0 or less when measured by the SCE method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface. (D): The difference between the maximum and minimum values ​​of 25 measured values ​​of the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value.

[0155] When the combination of conditions (A) and (C) or the combination of conditions (B) and (C) is satisfied, the decorative sheet 20 suppresses changes in the amount of reflected light and the amount of transmitted light on the first surface 20a. In the display system 1 including this decorative sheet 20, changes in the amount of reflected light and the amount of transmitted light by the decorative sheet 20 are suppressed in both the first region A1 and the second region A2. The display system 1 can suppress the design D from being observed to be more noticeable than the image IM, at least in the first region A1. Therefore, the decorative sheet 20 that satisfies the combination of conditions (A) and (C) or the combination of conditions (B) and (C) can suppress deterioration in the image quality of the image IM in the display system 1 and further improve the visibility of the image IM.

[0156] L＊ The difference between the maximum and minimum values ​​of the L value may be 6.0 or less, 5.9 or less, 4.8 or less, 3.8 or less, 3.7 or less, or 2.4 or less, when measured by the SCI method using reflected light with the first surface 20a as the incident surface. ＊ The difference between the maximum and minimum values ​​of the value may be 6.2 or less, 6.1 or less, 5.9 or less, 5.8 or less, 3.9 or less, or 2.9 or less, when measured using the SCE method with reflected light from the first surface 20a as the incident surface.

[0157] In the 25 measured values ​​of the total light transmittance of the decorative sheet 20, the difference between the maximum and minimum values ​​may be 21% or less of the average value, 20% or less, 18% or less, 17% or less, or 11% or less.

[0158] When the design D in the decorative sheet 20 includes a pattern P, in order to clearly display the pattern P, ＊ A lower limit may be set for the difference between the maximum and minimum values. When considering the clear display of the pattern P, ＊ The difference between the maximum and minimum values ​​of the L value is preferably 0.4 or more when measured by the SCI method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface. ＊ The difference between the maximum and minimum values ​​is preferably 0.5 or more when measured by the SCE method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface.

[0159] However, L ＊ The difference between the maximum and minimum values ​​of the L value may be less than 0.4 when measured by the SCI method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface, when clear display of the pattern P is not taken into consideration. ＊ The difference between the maximum and minimum values ​​of the L value may be 0.1 or more when measured by the SCI method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface. ＊The difference between the maximum and minimum values ​​of the L value may be less than 0.5 when measured by the SCE method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface, when clear display of the pattern P is not taken into consideration. ＊ The difference between the maximum and minimum values ​​of the value may be 0.1 or more when measured by the SCE method using reflected light with the first surface 20a of the decorative sheet 20 as the incident surface.

[0160] There is no particular limitation on the lower limit of the difference between the maximum and minimum values ​​of multiple measured values ​​of the total light transmittance of the decorative sheet 20. The difference between the maximum and minimum values ​​of 25 measured values ​​of the total light transmittance of the decorative sheet 20 may be 1% or more of the average value, 3% or more, 5% or more, or 6% or more.

[0161] In the following, L ＊ This section explains how to determine the difference between the maximum and minimum values ​​of a value. ＊ To determine the difference between the maximum and minimum values, L ＊ Ten measurements of the value are used.

[0162] L ＊ The value is measured by the method described above. ＊ The measured value is the L measured by the SCI method. ＊ It is used to calculate the variation in the value. ＊ The measured value is the L measured by the SCE method. ＊ Used to calculate the variation in values. L including the equipment used, measurement wavelength range, measurement wavelength interval, measurement mode, color system, color difference formula, viewing angle, observation light source, measurement diameter and illumination diameter ＊ The conditions for measuring the values ​​are as described above.

[0163] When the design D on the first surface 20a of the decorative sheet 20 is composed of a combination of a plurality of different colors, L ＊ The 10 measurements for the value include 5 measurements in the area displaying the dark color and 5 measurements in the area displaying the light color. ＊The maximum value is the maximum value among the five measured values ​​in the part that displays the light color. ＊ The minimum value is the minimum value among the five measured values ​​in the portion displaying the dark color. When the design D in the decorative sheet 20 includes the pattern P, the design D is composed of a combination of a plurality of different colors.

[0164] A "dark color" is a color with a relatively low brightness. A dark color may be a chromatic color or an achromatic color. Examples of dark colors include black, dark gray, navy blue, brown, yellowish brown, dark green, dark purple, and crimson. A "light color" is a color with a relatively high brightness. A light color may be a chromatic color or an achromatic color. Examples of light colors include white, light gray, beige, ivory, and silver.

[0165] Specifically, the portions displaying dark colors and the portions displaying light colors are identified by the following method. First, a grayscale image of the first surface 20a is acquired. The grayscale image of the first surface 20a has 256 gradations. The resolution of the grayscale image of the first surface 20a is 200 dpi. The dimensions of the first surface 20a shown by the grayscale image are 10 cm square. When the decorative sheet 20 includes a decorative portion 21 and a non-decorative portion 22, the grayscale image of the first surface 20a is acquired with a black sheet superimposed on the second surface 20b side.

[0166] The grayscale image of the first surface 20a for identifying the portions displaying dark or light colors differs from the grayscale image of the first surface 20a for identifying the high-brightness reflective regions HL described below.

[0167] Next, the pixel value of each pixel is determined in the grayscale image of the first surface 20a. The pixel value of each pixel is determined by importing the grayscale image of the first surface 20a into "Image J." "Image J" is public domain software for image processing. Each pixel has a pixel value between 0 and 255 depending on the color. Each pixel has a color of black, gray, or white depending on the pixel value. The pixel value of a portion of the grayscale image that displays a dark color is relatively low. The pixel value of a portion of the grayscale image that displays a light color is relatively high.

[0168] The portion displaying a dark color is identified based on the highest pixel value, the lowest pixel value, and the gradation difference between the highest and lowest pixel values ​​in the grayscale image. The same is true for the portion displaying a light color. The portion of the first surface 20a displaying a dark color is an area including pixels having a pixel value equal to or less than the sum of the lowest pixel value and 10% of the gradation difference. The portion of the first surface 20a displaying a light color is an area including pixels having a pixel value equal to or greater than the difference between the highest pixel value and the gradation difference. If 10% of the gradation difference is not an integer, the decimal point is truncated.

[0169] As an example, assume a grayscale image in which the lowest pixel value is 3 and the highest pixel value is 250. In this grayscale image, the grayscale difference is 247, and 10% of the grayscale difference is 24.7. In this grayscale image, the sum of the lowest pixel value and 10% of the grayscale difference is 27. Therefore, the portion of the first surface 20a that displays a dark color is the portion that includes pixels having a pixel value of 27 or less. Also, in this grayscale image, the difference between the highest pixel value and 10% of the grayscale difference is 226. Therefore, the portion of the first surface 20a that displays a light color is the portion that includes pixels having a pixel value of 226 or more.

[0170] In identifying the areas that display a dark color and the areas that display a light color, it is visually confirmed that there is little change in color within a circular area having a diameter of 8 mm. ＊ is the measuring diameter of the spectrophotometer used to measure the value.

[0171] L ＊ The difference between the maximum and minimum values ​​for the value may be adjusted by adjusting the coloring material contained in the design layer 25. As one example, the concentration of the coloring material contained in the ink forming the design layer 25 may be adjusted. As another example, when forming the design layer 25, the simultaneous use of an ink forming a portion displaying a light color and an ink forming a portion displaying a dark color may be avoided. As yet another example, an ink displaying one of a light color and a dark color may conceal an ink displaying the other of the light color and the dark color.

[0172] L ＊ The difference between the maximum and minimum values ​​for the value may be adjusted by adjusting the design D of the design layer 25. As an example, if the design D includes a pattern P, ＊ A pattern P to be included in the design D may be selected based on the difference between the maximum and minimum values.

[0173] The 25 measurement values ​​for the total light transmittance of the decorative sheet 20 are measured at 25 different locations on the decorative sheet 20. The 25 measurement locations for the total light transmittance include a portion of the decorative sheet 20 that displays a dark color and a portion of the decorative sheet 20 that displays a light color.

[0174] The measured value of the total light transmittance is obtained under the above-mentioned measurement conditions using a haze meter conforming to JIS K 7361-1: 1997. When the measured value of the total light transmittance is obtained, the measurement diameter of the haze meter is 14 mm.

[0175] The method for identifying the portions displaying a dark or light color is as described above. However, in identifying the portions displaying a dark or light color, it is visually confirmed that the color change is small within a circular area having a diameter of 14 mm. 14 mm is the measurement diameter of the haze meter described above.

[0176] The combination of conditions (A) and (C) or the combination of conditions (B) and (C) may be satisfied in the portion of the decorative sheet 20 located in the first area A1 from the viewpoint of suppressing deterioration of the image quality of the image IM. In the display system 1, the determination of conditions (A)-(C) may be performed only in the first area A1. In this case, the L for determining conditions (A) and (B) may be ＊ A plurality of measured values ​​relating to the total light transmittance for determining the condition (C) are obtained in the first region A1 of the display system 1. Similarly, in the decorative sheet 20, the determination of the conditions (A) to (C) may be performed only in the portion located in the first region A1. In this case, the L for determining the conditions (A) and (B) is obtained in the first region A1 of the display system 1. ＊ The plurality of measured values ​​for the total light transmittance are obtained in a portion of the first surface 20a located in the first region A1. The plurality of measured values ​​for the total light transmittance for determining condition (C) are obtained in a portion of the decorative sheet 20 located in the first region A1.

[0177] However, it can be difficult to predict the portion of the decorative sheet located in the first region of the display system after fabrication of the decorative sheet and before fabrication of the display system. In particular, when the decorative sheet is applied to various display systems, the portion located in the first region of the decorative sheet varies among the multiple display systems, making this prediction particularly difficult. Therefore, the decorative sheet 20 may satisfy the combination of conditions (A) and (C) or the combination of conditions (B) and (C) in both the portion located in the first region A1 and the portion located in the second region A2. Such a decorative sheet 20 can stably suppress degradation of the image quality of the image IM in the display system 1, regardless of the position where it overlaps with the light-emitting device 10. From a similar perspective, the display system 1 may satisfy the combination of conditions (A) and (C) or the combination of conditions (B) and (C) in both the first region A1 and the second region A2.

[0178] From the viewpoint of improving the visibility of the image IM displayed by the display system 1, an upper limit may be set for the proportion of the area of ​​the high-brightness reflective regions HL in the decorative sheet 20. The proportion of the high-brightness reflective regions HL may be 35% or less, 31% or less, 29% or less, 24% or less, 15% or less, or 5% or less. The proportion of the high-brightness reflective regions HL may be 1% or more, or 1.4% or more.

[0179] The "area ratio of the high brightness reflective regions HL" in the decorative sheet 20 is determined using a grayscale image captured indoors of the first surface 20a of the decorative sheet 20, as will be described below.

[0180] An optical microscope having an imaging device is prepared. The imaging device includes a camera device and a lens device attached to the camera device. The lens device used is a VH-Z20R manufactured by Keyence Corporation. The camera device used is a camera device capable of generating an image using this lens device.

[0181] As shown in FIGS. 7 and 8 , a lens device 90 is used, which includes an objective lens 91 facing the stage of the optical microscope and a circumferential illumination unit 92 surrounding the objective lens 91. The illumination unit 92 can illuminate the stage using one-sided illumination. As shown in FIG. 8 , during one-sided illumination, a portion of the illumination unit 92 having a circumference of ¼ of the entire circumference is lit, and a portion having a circumference of ¾ of the total length is unlit. In the circumferential illumination unit 92 shown in FIG. 8 , a first portion 92a having a circumference of ¼ of the entire circumference is lit, and a second portion 92b, a third portion 92c, and a fourth portion 92d are unlit. The combined circumference of the second portion 92b, the third portion 92c, and the fourth portion 92d is ¾ of the entire circumference.

[0182] Prior to imaging the decorative sheet 20, the luminance of the decorative sheet 20 in the imaging environment is measured. A standard white plate is placed on the stage of an optical microscope. The standard white plate is placed on the stage of the optical microscope so that the center of gravity of the standard white plate faces the objective lens of the lens device. The standard white plate placed on the stage is illuminated by an illumination unit. The illumination unit irradiates the standard white plate with light using the one-sided illumination described above. The angle of incidence of the light irradiated from the illumination unit onto the standard white plate is 21.75°. The luminance of the standard white plate in this state is measured using a luminance meter (CS-100A manufactured by Konica Minolta, Inc.). The luminance meter includes a lens. The measurement angle of the luminance meter is 45°. The "measurement angle of the luminance meter" is the angle between the normal direction of the surface of the standard white plate facing the objective lens 91 and the line segment connecting the center of gravity of the standard white plate and the optical axis of the lens of the luminance meter. The distance between the center of gravity of the standard white board and the luminance meter is 30 cm.

[0183] Before capturing an image of the decorative sheet 20, it is confirmed that the brightness in the capturing environment is stable. Specifically, the brightness measured by the above-mentioned method is 10,000 cd / m for one minute. ２ ~30000cd / m ２ Make sure it is located in the range.

[0184] Next, an image of the first surface 20a is captured using an imaging device. The imaging device captures an image of a portion of the first surface 20a. The portion of the first surface 20a being captured has a length of 6.1 mm in the longitudinal direction and a length of 4.6 mm in the width direction. As shown in FIG. 7, the decorative sheet 20 is placed on the stage 100 of an optical microscope. When capturing an image of the first surface 20a, the magnification of the objective lens 91 is set to 50x. As shown in FIG. 7, the decorative sheet 20 is placed on the stage 100 of the optical microscope so that the first surface 20a faces the objective lens 91. The distance between the objective lens 91 and the first surface 20a is set to 29.0 mm. The decorative sheet 20 placed on the stage 100 is illuminated by an illumination unit 92. The diameter of the illumination unit 92 is set to 27.5 mm. The illumination unit 92 irradiates the decorative sheet 20 with light using the one-sided illumination described above. The incident angle θ of the light irradiated onto the decorative sheet 20 from the lighting unit 92 is set to 21.75°. In this state, the imaging device captures a grayscale image of the first surface 20a.

[0185] The grayscale image on the first surface 20a has 256 gradations. The grayscale image on the first surface 20a includes a plurality of pixels. In the grayscale image on the first surface 20a, 1600 pixels are arranged in the longitudinal direction. In the grayscale image on the first surface 20a, 1200 pixels are arranged in the width direction. In the grayscale image on the first surface 20a, one pixel is 3.8 μm ２ It has an area of

[0186] In the grayscale image of the first surface 20a having 256 gradations, each pixel has a pixel value between 0 and 255. Each pixel has a color of black, gray, or white depending on the pixel value. Each pixel has a pixel value between 0 and 255 depending on the brightness of the portion of the first surface 20a corresponding to that pixel. The larger the pixel value of a pixel in the grayscale image of the first surface 20a, the brighter the color of that pixel. Therefore, the greater the brightness of a portion of the first surface 20a, the larger the pixel value of the pixel corresponding to that portion. In the grayscale image of the first surface 20a, the pixel value of the pixel corresponding to the brightest portion of the first surface 20a is the maximum value, i.e., 255.

[0187] A high-brightness reflective region HL is identified in the grayscale image of the first surface 20a. The high-brightness reflective region HL in the grayscale image is a region that includes pixels in the grayscale image that have a pixel value between 129 and 255. Therefore, the "proportion of the high-brightness reflective region HL" is the proportion of pixels that have a pixel value between 129 and 255 to all pixels in the grayscale image of the first surface 20a.

[0188] Fig. 9 is an image showing an example of the high-brightness reflective region HL of the decorative sheet 20. Fig. 9 is an image obtained by binarizing the grayscale image of the first surface 20a. The white portions in Fig. 9 indicate the high-brightness reflective regions HL. That is, the pixels corresponding to the white portions in Fig. 9 have pixel values ​​ranging from 129 to 255. The pixels corresponding to the black portions in Fig. 13 have pixel values ​​ranging from 0 to 128.

[0189] When the design D in the decorative sheet 20 includes a pattern P, conditions may be set regarding the luminance distribution on the first surface 20a of the decorative sheet 20 in order to clearly display the pattern P. The present inventors discovered that the luminance distribution on the first surface 20a of the decorative sheet 20 can be quantified from a grayscale image of the first surface 20a. Furthermore, the present inventors discovered that the decorative sheet 20 can clearly display the pattern P as the design D when the pixel value variation in the grayscale image of the first surface 20a is 15 or more. In the grayscale image of the first surface 20a, the pixel value variation may be 25 or more, or 27 or more. Hereinafter, the pixel value variation in the grayscale image of the first surface 20a will also be simply referred to as "pixel value variation." When such a lower limit is set for the pixel value variation, it becomes easy to distinguish between brightly displayed and darkly displayed portions of the pattern P.

[0190] The variation in pixel values ​​changes depending on the pattern P that the decorative sheet 20 displays as the design D. The decorative sheet 20 to be applied to the application target may be selected depending on the variation in pixel values. The decorative sheet 20 selected depending on the variation in pixel values ​​can clearly display the pattern P as the design D.

[0191] However, if the above-described variation in pixel values ​​becomes excessively large, the visibility of the image IM may be deteriorated due to the above-described mechanism in the display system 1 including the decorative sheet 20. From the viewpoint of suppressing deterioration in the visibility of the image IM in the display system 1, a lower limit for the variation in pixel values ​​may be set in the decorative sheet 20. Specifically, the variation in pixel values ​​in the grayscale image obtained by capturing the first surface 20a may be 65 or less. If the variation in pixel values ​​is 65 or less, deterioration in the visibility of the image IM in the display system 1 can be suppressed, as will be shown in the examples described later.

[0192] The variation in pixel values ​​is not limited from the viewpoint of visibility of the image IM as long as it is 65 or less. The variation in pixel values ​​may be 60 or less, 50 or less, 47 or less, or 40 or less.

[0193] The variation in pixel values ​​is identified by the following method. First, a grayscale image used to identify the variation in pixel values ​​is obtained by the above-described method, similar to the grayscale image used to identify the high-brightness reflective region HL. The grayscale image used to identify the variation in pixel values ​​may be the same as the grayscale image used to identify the high-brightness reflective region HL described above.

[0194] Next, pixel values ​​of pixels overlapping with lines drawn on the grayscale image of the first surface 20a are obtained at 10° intervals. Specifically, as shown in Fig. 10, pixel values ​​of pixels overlapping with the first line LN1 to the eighteenth line LN18 that overlap with each other at the convergence point CT are obtained. Fig. 10 shows the grayscale image of the first surface 20a and the first line LN1 to the eighteenth line LN18 drawn on the grayscale image.

[0195] The first line LN1 to the eighteenth line LN18 overlap the first surface 20a in the first direction D1. The first line LN1 to the eighteenth line LN18 extend linearly from one end to the other. The convergence point CT is located between the first end and the other end of the first line LN1 to the eighteenth line LN18. Therefore, as shown in FIG. 10, the first line LN1 to the eighteenth line LN18 appear as a collection of lines extending radially from the convergence point CT. The aforementioned "Image J" is used to acquire pixel values. In FIG. 10, the first line LN1 to the eighteenth line LN18 are aligned in the circumferential direction around the convergence point CT. Each line has a dimension of 3.8 mm. In FIG. 10, the angle between two adjacent lines in the circumferential direction is 10°. In other words, the following angles in FIG. 10 are 10°: Angle between first line LN1 and second line LN2 Angle between second line LN2 and third line LN3 Angle between third line LN3 and fourth line LN4 Angle between fourth line LN4 and fifth line LN5 Angle between fifth line LN5 and sixth line LN6 Angle between sixth line LN6 and seventh line LN7 Angle between seventh line LN7 and eighth line LN8 Angle between eighth line LN8 and ninth line LN9 Angle between ninth line LN9 and tenth line LN10 Angle between tenth line LN10 and eleventh line LN11 Angle between eleventh line LN11 and twelfth line LN12 Angle between twelfth line LN12 and thirteenth line LN13 Angle between thirteenth line LN13 and fourteenth line LN14 Angle between fourteenth line LN14 and fifteenth line LN15 Angle between fifteenth line LN15 and sixteenth line LN16 Angle between the 16th line LN16 and the 17th line LN17 Angle between the 17th line LN17 and the 18th line LN18 Angle between the 18th line LN18 and the 1st line LN1

[0196] Next, the standard deviation of pixel values ​​of pixels overlapping each line in the grayscale image (1200 pixels horizontally and 1600 pixels vertically) of the first surface 20a is calculated. The standard deviation of pixel values ​​is calculated from the distribution of pixel values ​​of 1000 pixels, 500 pixels before and after each pixel overlapping each line, centered around the convergence point CT. FIG. 11 shows a graph of the distribution of pixel values ​​of pixels overlapping the tenth line LN10. In the graph of FIG. 11, the horizontal axis represents the pixel position, and the vertical axis represents the pixel value. The horizontal axis of FIG. 11 represents the number of pixels. The values ​​on the horizontal axis represent the number of pixels when counting from one end of the line position. In FIG. 11, pixels with relatively large values ​​on the vertical axis can be observed as bright. In FIG. 11, pixels with relatively small values ​​on the vertical axis can be observed as dark. When calculating the standard deviation of pixel values ​​from the distribution of pixel values ​​exemplified in FIG. 11, spreadsheet software "Microsoft Excel" manufactured by Microsoft Corporation is used.

[0197] Using the above method, the standard deviation of the pixel values ​​of the pixels overlapping each line is obtained. Specifically, 18 standard deviations of the pixel values ​​are obtained, such as the first line LN1 to the eighteenth line LN18 illustrated in Figure 10. The variation in pixel values ​​is the maximum value of the 18 standard deviations obtained.

[0198] 1 to 6, an upper limit value for the high-brightness display region HI, which will be described below, may be set. In the illustrated display system 1, the area of ​​the high-brightness display region HI may be 4.0 times or less, 2.5 times or less, or 1.1 times or less the area of ​​the opening region 15X. The area of ​​the high-brightness display region HI may be 0.5 times or more, or 0.9 times or more the area of ​​the opening region 15X.

[0199] In the display system 1, the area of ​​the high-brightness display region HI is determined in a state in which a first light L1 and a second light L2 are irradiated onto the decorative sheet 20, which is placed on the display device 16 from the second surface 20b, as shown in Fig. 12. The first light L1 is light that simulates external light irradiated onto the display system 1. As shown in Fig. 12, the first light L1 is light that is incident on the first surface 20a of the decorative sheet 20 at an incident angle of 21.75°. The second light L2 is light that is emitted from the display device 16. To determine the area of ​​the high-brightness display region HI, a grayscale image captured of the first surface 20a of the decorative sheet 20 in a state in which the first light L1 and the second light L2 are irradiated is used.

[0200] An optical microscope having an imaging device is prepared. The imaging device includes a camera device and a lens device attached to the camera device. The lens device used is the VH-Z20R manufactured by Keyence Corporation described above. The camera device used is a camera device capable of generating a captured image using this lens device. The lens device includes the objective lens 91 described above and an illumination unit 92. The illumination unit 92 irradiates the first surface 20a of the decorative sheet 20 with first light L1.

[0201] Prior to imaging the decorative sheet 20, the luminance in the imaging environment irradiated with the first light L1 is measured. A standard white plate is placed on the stage of an optical microscope. The standard white plate is placed on the stage of the optical microscope so that the center of gravity of the standard white plate faces the objective lens 91 of the lens device. The standard white plate placed on the stage is illuminated by the illumination unit 92 of the lens device. The illumination unit 92 irradiates the center of gravity of the standard white plate using the one-sided illumination described above. The angle of incidence of the light irradiated from the illumination unit 92 onto the standard white plate is 21.75°. The luminance at the center of gravity of the standard white plate in this state is measured using a luminance meter (CS-100A manufactured by Konica Minolta, Inc.). The luminance meter includes a lens. The measurement angle of the luminance meter is 45°. The distance between the center of gravity of the standard white plate and the luminance meter is 30 cm.

[0202] Prior to imaging the decorative sheet 20, the brightness in the imaging environment is stable, i.e., the brightness measured by the above-described method is 10,000 cd / m for one minute. ２~30000cd / m ２ Make sure it is located in the range.

[0203] The first surface 20a is imaged using an imaging device. The imaging device captures a portion of the first surface 20a. The portion of the first surface 20a being imaged has a length of 15.24 mm in the longitudinal direction and a length of 11.40 mm in the width direction. When imaging the first surface 20a, the magnification of the objective lens 91 is 20x. As shown in FIG. 12 , the display system 1 is placed on the stage of an optical microscope so that the first surface 20a of the decorative sheet 20 faces the objective lens 91 of the lens device. The illustrated display system 1 includes a light-emitting device 10, a pattern mask 15, and a decorative sheet 20. In the display system 1, the light-emitting device 10 is capable of emitting light from its light-emitting surface 11 toward the second surface 20b. The light emitted from the light-emitting surface 11 toward the decorative sheet 20 is shaped by the pattern mask 15. The light shaped by the pattern mask 15 and emitted toward the second surface 20b is used by the display device 16 as second light L2.

[0204] In the display system 1, as shown in Fig. 12, a light-adjusting filter F may be disposed between the pattern mask 15 and the decorative sheet 20 to adjust the amount of second light L2 incident on the decorative sheet 20. An ND filter manufactured by Fujifilm Corporation is used as the light-adjusting filter F. When adjusting the amount of second light L2, a luminance meter is directed toward the first area A1 of the display system 1. The measurement angle of the luminance meter is 45°. The distance between the first area A1 and the luminance meter is 30 cm.

[0205] Prior to capturing an image of the decorative sheet 20, the amount of the second light L2 is adjusted. In the state shown in Fig. 12 , the luminance in the first area A1 of the display system 1 is adjusted as the amount of the second light L2. The luminance in the first area A1 of the display system 1 is adjusted by the above-mentioned light modulation filter F. The amount of the second light L2 is adjusted in a state in which the first light L1 is not irradiated from the illumination unit 92 of the lens device. The amount of the second light L2 is adjusted so that the ratio between the luminance of the first light L1 measured at the center of gravity of the above-mentioned standard white board and the luminance measured in the first area A1 of the display system 1 becomes 45,000:1,000.

[0206] The above-mentioned ratio (45,000:1,000) between the luminance of the first light L1 and the luminance of the second light L2 simulates a state in which the display system 1 displays an image IM in a room where external light streams in during the day. Therefore, by irradiating the decorative sheet 20 with the first light L1 and the second light L2 having the above-mentioned ratio, it is possible to reproduce the display system 1 that displays an image IM in a room where external light streams in during the day.

[0207] The first surface 20a of the decorative sheet 20 is imaged in a state where the first light L1 and the second light L2 are irradiated onto the decorative sheet 20. By imaging the first surface 20a, a grayscale image of the first surface 20a is obtained in a state where the first light L1 is irradiated onto the first surface 20a of the decorative sheet 20 and the second light L2 is irradiated onto the second surface 20b of the decorative sheet 20. The grayscale image of the first surface 20a has 256 gradations. The grayscale image of the first surface 20a includes a plurality of pixels. In the grayscale image of the first surface 20a, 1600 pixels are arranged in the longitudinal direction. In the grayscale image of the first surface 20a, 1200 pixels are arranged in the width direction. In the grayscale image of the first surface 20a, one pixel has a resolution of 9.5 μm. ２ It has an area of

[0208] In the grayscale image of the first surface 20a having 256 gradations, each pixel has a pixel value between 0 and 255. Each pixel has a color of black, gray, or white depending on the pixel value. Each pixel has a pixel value between 0 and 255 depending on the brightness of the portion of the first surface 20a corresponding to that pixel. The larger the pixel value of a pixel in the grayscale image of the first surface 20a, the brighter the color of that pixel. Therefore, the greater the brightness of a portion of the first surface 20a, the larger the pixel value of the pixel corresponding to that portion. In the grayscale image of the first surface 20a, the pixel value of the pixel corresponding to the brightest portion of the first surface 20a is the maximum value, i.e., 255.

[0209] In the grayscale image on the first surface 20a, a high-brightness display region HI is identified. The high-brightness display region HI of the grayscale image is a region that includes pixels having a pixel value between 129 and 255 in the grayscale image.

[0210] Fig. 13 is an image showing an example of the high-brightness display region HI of the decorative sheet 20. Fig. 13 is an image obtained by binarizing the grayscale image of the first surface 20a. The white portions in Fig. 13 indicate the high-brightness display region HI. That is, the pixels corresponding to the white portions in Fig. 13 have pixel values ​​ranging from 129 to 255. The pixels corresponding to the black portions in Fig. 13 have pixel values ​​ranging from 0 to 128.

[0211] In the display system 1 shown in Figures 1 to 6, a lower limit is set as described above for the ratio of the area of ​​the high-brightness display region HI to the area of ​​the opening region 15X of the pattern mask 15. In the illustrated display system 1, expansion of the high-brightness display region HI is suppressed when the first light L1 and the second light L2 are irradiated onto the decorative sheet 20. In other words, in the illustrated display system 1, expansion of the high-brightness display region HI is suppressed when a state in which an image IM is displayed indoors with daytime external light streaming in is reproduced. Therefore, even when daytime external light streams into the display system 1, the display system 1 can clearly display the image IM.

[0212] In the embodiment described above, the decorative sheet 20 has a first surface 20a and a second surface 20b. The decorative sheet 20 includes a design layer 25 having a design D that can be observed from the first surface 20a. ＊ a ＊ b ＊ L in color system ＊ The value is 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

[0213] In the embodiment described above, the decorative sheet 20 has a first surface 20a and a second surface 20b. The decorative sheet 20 includes a design layer 25 having a design D that can be observed from the first surface 20a. ＊ a ＊ b ＊ L in color system ＊ The value is 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

[0214] According to this embodiment, it is possible to suppress an increase in luminance due to reflected light from the first surface 20 a serving as the incident surface in the decorative sheet 20. Therefore, in the display system 1 including the decorative sheet 20 according to this embodiment, it is possible to improve the visibility of the image IM.

[0215] Although one embodiment has been described with reference to specific examples, the above-described specific examples do not limit the present invention. The above-described embodiment can be implemented with various other specific examples, and various omissions, substitutions, changes, additions, etc. can be made without departing from the spirit of the present invention.

[0216] In the above-described display system 1, the display device 16 displays the image IM. The display device 16 includes the light-emitting device 10 and the pattern mask 15 that overlaps the light-emitting surface 11 of the light-emitting device 10. In the display system 1, the light-emitting device 10 may display the image IM.

[0217] The image IM displayed by the above-described display system 1 is a character string. The image IM is not limited to a character string, and may include one or more of a figure, a design, a color, a picture, a photograph, a character, a mark, and a pictogram. The image IM may be a still image or a moving image.

[0218] The display system 1 described above is ＊ a ＊ b ＊ L in color system ＊ In place of the decorative sheet 20, the display system 1 configured in the same manner as in FIG. ＊ a ＊ b ＊ L in color system ＊ In the display system 1 including the light-emitting device 10 and the decorative sheet 20, the L ＊ The value may be 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the display surface 1a as the incident surface. ＊ The L value may be 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the display surface 1a as the incident surface. ＊ The value is the L ＊ It is measured by the same method as that for measuring the value.

[0219] An example of the modification will be described below with reference to the drawings. In the following description and the drawings used in the following description, parts that can be configured similarly to the above-described specific example will be designated by the same reference numerals as those used for the corresponding parts in the above-described specific example, and duplicated descriptions will be omitted.

[0220] The decorative sheet 20 described above includes a light-shielding layer 24 that has visible light-shielding properties. In the decorative sheet 20 described above, the light-shielding layer 24 and the design layer 25 are disposed in the decorative portion 21. However, this is not limiting, and as shown in Fig. 14, the light-shielding layer 24 may be omitted from the decorative sheet 20. As shown in Fig. 14, the design layer 25 may be disposed in the decorative portion 21, and the light-shielding layer 24 may not be disposed.

[0221] The decorative sheet 20 described above includes the non-decorative portion 22 that does not form the design D. However, the decorative sheet 20 is not limited to this, and may not include the non-decorative portion 22, as shown in Fig. 14. The decorative sheet 20 may include only the decorative portion 21.

[0222] In the above-described display system 1, the light emitted from the light-emitting device 10 is shaped by the pattern mask 15. The light shaped by the pattern mask 15 forms the image IM. However, the present invention is not limited to this, and the light emitted from the light-emitting device 10 may be shaped by the decorative sheet 20. The light shaped by the decorative sheet 20 may form the image IM.

[0223] The second surface 20b of the decorative sheet 20 shown in FIG. 14 is formed by a pattern mask layer 28. The pattern mask layer 28 shapes light incident on the second surface 20b of the decorative sheet 20. The illustrated pattern mask layer 28 has visible light blocking properties. Similar to the light-blocking layer 24 described above, the pattern mask layer 28 may include a binder resin and light-absorbing particles dispersed in the binder resin. The light-absorbing particles may include a black pigment such as carbon black or titanium black. The pattern mask layer 28 may include an optical interference pigment instead of the light-absorbing particles. The optical interference pigment may be, for example, an aluminum pigment.

[0224] The decorative sheet 20 shown in Fig. 14 includes recesses 20r that open to the second surface 20b. In particular, the recesses 20r shown penetrate the pattern mask layer 28. The recesses 20r shown do not penetrate the design layer 25. As described above, the decorative sheet 20 shown in Fig. 14 does not include the light-shielding layer 24. As a result, the decorative sheet 20 shown transmits visible light to an extent that the recesses 20r can be distinguished from portions other than the recesses 20r.

[0225] 14 may be superimposed on the light-emitting device 10 to form a display system 1. In such a display system 1, the decorative sheet 20 transmits light emitted from the light-emitting device 10 at the recesses 20r. In the display system 1, the area of ​​the decorative sheet 20 that overlaps with the recesses 20r becomes a first area A1 in which the image IM and the design D can be displayed. In the display system 1, the area of ​​the decorative sheet 20 that overlaps with the portion other than the recesses 20r becomes a second area A2.

[0226] 14 shows a decorative sheet 20 that does not include a light-shielding layer 24 but includes a pattern mask layer 28, but the decorative sheet 20 may include both the light-shielding layer 24 and the pattern mask layer 28, as shown in FIG. 15. In other words, even in a decorative sheet 20 that includes a pattern mask layer 28, the light-shielding layer 24 may be disposed in the decorative portion 21. In such a decorative sheet 20, the recess 20r may be overlapped by the decorative portion 21 or by the non-decorative portion 22. In such a decorative sheet 20, the overlapping portion where the non-decorative portion 22 and the recess 20r overlap transmits visible light to an extent that it can be distinguished from the portion other than the overlapping portion.

[0227] The decorative sheet 20 described above includes the bonding layer 26. The decorative sheet 20 does not need to include the bonding layer 26. In a decorative sheet 20 in which the bonding layer 26 is omitted, the surface layer 27 may be in contact with the light-shielding layer 24, the design layer 25, and the base layer 23.

[0228] As shown in Figures 16 to 18, the display system 1 may include a light-emitting device 10 and a decorative member 40 overlaid on the light-emitting device 10. The illustrated decorative member 40 includes a decorative sheet 20 and a thermoplastic resin portion 45 bonded to the decorative sheet 20. As shown in Figure 18, the decorative member 40 has a first surface 40a and a second surface 40b. The first surface 40a of the decorative member 40 forms the first surface 20a of the decorative sheet 20. In other words, the first surface 20a of the decorative sheet 20 forms the outer surface of the decorative member 40. The second surface 40b of the decorative member 40 is formed by the thermoplastic resin portion 45. The decorative sheet 20 is bonded to the thermoplastic resin portion 45 at the second surface 20b.

[0229] The decorative member 40 may have a three-dimensional shape as shown in Fig. 16. The illustrated decorative member 40 is bent in the first direction D1 at both ends in the second direction D2. The bent portions of the decorative member 40 extend in the third direction D3.

[0230] 16 , the decorative member 40 does not have to have a three-dimensional shape. As an example, the decorative member 40 may include a decorative sheet 20 and a plate-shaped thermoplastic resin part 45 joined to the decorative sheet 20.

[0231] 17 , the decorative member 40 displays the design D of the decorative sheet 20. The illustrated decorative member 40 displays a pattern P as the design D. Specifically, the decorative member 40 displays a wood grain pattern as the pattern P. By displaying the design D by the decorative member 40, the light-emitting device 10 can be concealed when the display system 1 is observed. When the illustrated display system 1 is observed from the first side in the first direction D1, the light-emitting device 10 can be concealed by the decorative member 40.

[0232] From the viewpoint of stably concealing the light emitting device 10, an upper limit may be set for the total light transmittance of the decorative member 40. The total light transmittance of the decorative member 40 may be 50% or less, or 30% or less. From the viewpoint of stably displaying the light emitted from the light emitting device 10, a lower limit may be set for the total light transmittance of the decorative member 40. The total light transmittance of the decorative member 40 may be 7% or more, 10% or more, 13% or more, 18% or more, or 20% or more. The total light transmittance of the decorative member 40 is measured by the method described above.

[0233] 18 has a decorative portion 41 and a non-decorative portion 42. In FIG. 18, the decorative portion 41 is a portion that overlaps with the decorative portion 21 of the decorative sheet 20. The non-decorative portion 42 is a portion that overlaps with the non-decorative portion 22 of the decorative sheet 20.

[0234] The non-decorative portion 42 may be formed by joining the decorative sheet 20 including the non-decorative portion 22 to the thermoplastic resin portion 45. In other words, the non-decorative portion 42 may be formed by joining the decorative sheet 20, on which the non-decorative portion 22 has already been formed, to the thermoplastic resin portion 45.

[0235] The non-decorative portion 42 may be formed by forming the non-decorative portion 22 on the decorative sheet 20 in a state where it is bonded to the thermoplastic resin portion 45. The non-decorative portion 42 may be formed by removing the light-shielding layer 24 and the design layer 25 from the decorative sheet 20 in a state where it is bonded to the thermoplastic resin portion 45. As described above, the light-shielding layer 24 and the design layer 25 may be removed by various methods such as laser etching and sandblasting.

[0236] The decorative member 40 in Fig. 18 includes a first portion 40X including a plurality of regularly arranged non-decorative portions 42 and a second portion 40Y that does not include any non-decorative portions 42. The plurality of non-decorative portions 42 may be regularly arranged two-dimensionally in the first portion 40X. Unlike the illustration, the decorative member 40 does not need to include the second portion 40Y. The decorative member 40 may include only the first portion 40X.

[0237] 16 , light emitted from the light-emitting device 10 toward the decorative member 40 can pass through the non-decorative portion 42. The light emitted from the light-emitting device 10 toward the decorative member 40 can be absorbed in the decorative portion 41. The light emitted from the light-emitting device 10 toward the decorative member 40 can be absorbed in the decorative portion 41 by the light-shielding layer 24 of the decorative sheet 20.

[0238] 17 displays an image IM by transmitting light emitted from the light-emitting device 10 through the non-decorated portion 42 of the decorative member 40. The illustrated display system 1 displays patterns of a cross, a triangle, and a square as the image IM.

[0239] The decorative sheet 20 in Fig. 18 includes a first portion 20X and a second portion 20Y. In the display system 1 in Fig. 18, the first portion 20X of the decorative sheet 20 is disposed in a first region A1 of the display system 1. The second portion 20Y of the decorative sheet 20 is disposed in a second region A2 of the display system 1. Therefore, the illustrated decorative sheet 20 does not include a non-decorative portion 22 in the second region A2 of the display system 1. The illustrated decorative member 40 does not include a non-decorative portion 42 in the second region A2 of the display system 1.

[0240] 16, the thermoplastic resin part 45 includes a portion located between the light emitting device 10 and the decorative sheet 20. The thermoplastic resin part 45 is capable of transmitting light emitted from the light emitting device 10. The thermoplastic resin part 45 may be transparent.

[0241] The thermoplastic resin portion 45 may be produced by welding an injected resin to the decorative sheet 20. The thermoplastic resin portion 45 may be produced by solidifying an injected resin injected into a cavity formed in an injection molding device.

[0242] The decorative sheet 20 is accommodated in a cavity when the thermoplastic resin part 45 is produced using an injection molding device. The decorative sheet 20 may be molded in the cavity. Molding of the decorative sheet 20 in the cavity may be performed by any of simultaneous injection molding and decoration, blow molding, and gas injection molding.

[0243] The decorative sheet 20 may be preformed before being bonded to the thermoplastic resin part 45. The decorative sheet 20 may be preformed into a three-dimensional shape. The method for preforming the decorative sheet 20 may be any of vacuum forming, pressure forming, and bending forming.

[0244] The decorative sheet 20 may include a backer layer 29. The backer layer 29 has a function of maintaining the decorative sheet 20 in its preformed shape. The decorative sheet 20 may be maintained in a three-dimensional shape. In the decorative sheet 20, the base layer 23 may function as the backer layer 29, as shown in FIG. 18 .

[0245] The decoration member 40 may be movable relative to the light-emitting device 10. The decoration member 40 shown in Fig. 16 is movable in a first direction D1 relative to the light-emitting device 10. The movement of the decoration member 40 relative to the light-emitting device 10 may be detected by an external control device (not shown). That is, the decoration member 40 may function as a button.

[0246] From the viewpoint of improving the visibility of the image in the display system 1, the decorative member 40 is ＊ Conditions on the value may be met, i.e., L ＊ a ＊ b ＊ L in color system ＊ The value may be 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface 40a of the decorative member 40 as the incident surface. ＊ a ＊ b ＊ L in color system ＊ The value may be 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface 40a of the decorative member 40 as the incident surface. However, the decorative member 40 is required to have the above-mentioned L ＊ The decorative sheet 20 may also include a decorative sheet 20 that satisfies a condition regarding the value.

[0247] In order to prevent the design D from being conspicuously observed in the first area A1 of the display system 1, the decorative member 40 may satisfy a combination of the above-mentioned conditions (A) and (C), or a combination of conditions (B) and (C).

[0248] 19 , the display system 1 may include a joint 17 located between the light-emitting device 10 and the decorative sheet 20. The joint 17 may contact the light-emitting surface 11 of the light-emitting device 10 and the second surface 20b of the decorative sheet 20. By arranging the joint 17 in this manner, it is not necessary to provide a gap AG between the light-emitting device 10 and the decorative sheet 20 in the display system 1.

[0249] The joint 17 in Fig. 19 is in contact with the base material layer 23 of the decorative sheet 20. The base material layer 23 is adjacent to the joint 17. The decorative sheet 20 in Fig. 19 includes an adjacent layer 200 adjacent to the joint 17. The illustrated adjacent layer 200 constitutes the second surface 20b of the decorative sheet 20. In the decorative sheet 20 in Fig. 19, the adjacent layer 200 is constituted by the base material layer 23. The adjacent layer 200 may be constituted by a layer other than the base material layer 23.

[0250] In the display system 1 of FIG. 19 , the refractive index difference between the adjacent layer 200 and the joint 17 may be smaller than the refractive index difference between the adjacent layer 200 and the gap AG. The materials of the adjacent layer 200 and the joint 17 may be selected to reduce the refractive index difference therebetween. The material of the adjacent layer 200 may be selected from acrylic, PET (polyethylene terephthalate), polycarbonate, polypropylene, and triacetyl cellulose. The adjacent layer 200 may include one or more of these materials. The material of the joint 17 may be selected from optically transparent resins such as OCR and OCA, and glycerin. The joint 17 may include one or more of these materials.

[0251] By reducing the refractive index difference between the adjacent layer 200 and the bonding portion 17, the decorative sheet 20 can suppress reflection of light incident from the first surface 20a at the second surface 20b. The display system 1 can suppress reflection of external light irradiated onto the display surface 1a at the second surface 20b of the decorative sheet 20. This reduces the amount of reflected external light emitted from the display surface 1a of the display system 1. Therefore, the illustrated display system 1 can suppress an increase in brightness on the display surface 1a due to external light. As a result, the illustrated display system 1 can more effectively improve the visibility of the image IM.

[0252] In the display system 1 of FIG. 19 , the refractive index difference between the joint 17 and the light-emitting surface 11 may be smaller than the refractive index difference between the gap AG and the light-emitting surface 11. The material of the light-emitting surface 11 and the material of the joint 17 may be selected to reduce the refractive index difference therebetween. In the light-emitting device 10, the material of the light-emitting surface 11 may be selected from alkali-free glass, soda glass, polycarbonate, and acrylic. The light-emitting device 10 may include one or more of these materials in the light-emitting surface 11. The material of the joint 17 may be selected from the materials described above.

[0253] By reducing the difference in refractive index between the light-emitting surface 11 and the joint 17, the display system 1 can suppress reflection of external light irradiated onto the display surface 1a from the light-emitting surface 11. This reduces the amount of reflected external light emitted from the display surface 1a of the display system 1. Therefore, the illustrated display system 1 can suppress an increase in brightness on the display surface 1a due to external light. As a result, the illustrated display system 1 can more effectively improve the visibility of the image IM.

[0254] 19 , the surface layer 27 may overlap the uneven surface 30 of the decorative sheet 20 from the first direction D1. The surface layer 27 may reduce the height difference of the uneven surface 30. In other words, the surface layer 27 may fill in the height difference of the uneven surface 30.

[0255] The surface layer 27 may contain a cured resin. By containing the cured resin, the scratch resistance of the surface layer 27 can be improved. The surface layer 27 containing the cured resin may be referred to as a hard coat layer.

[0256] The cured resin is a cured product of a thermosetting resin composition or a cured product of an ionizing radiation curable resin composition. The thermosetting resin composition contains a thermosetting resin. The thermosetting resin is usually a resin that crosslinks when heated. The thermosetting resin composition is cured by crosslinking the thermosetting resin. The thermosetting resin composition may further contain a curing agent. The curing agent may function as a catalyst to promote curing of the thermosetting resin and may react with the thermosetting resin. The thermosetting resin may crosslink by reacting with the curing agent. The curing agent may be contained in the cured product of the thermosetting resin composition. In the thermosetting resin composition, the thermosetting resin may be referred to as the main component.

[0257] The thermosetting resin contained in the thermosetting resin composition may include one or more of a phenolic resin, a urea resin, a diallyl phthalate resin, a melamine resin, a guanamine resin, an unsaturated polyester resin, a polyurethane resin, an epoxy resin, an aminoalkyd resin, a melamine-urea co-condensation resin, and a silicone resin. The curing agent contained in the thermosetting resin composition may be an isocyanate compound. The isocyanate compound is a compound containing an isocyanate group. The isocyanate compound may be a polyisocyanate containing a plurality of isocyanate groups.

[0258] The ionizing radiation curable resin composition contains an ionizing radiation curable resin. The ionizing radiation curable resin is a resin that crosslinks upon irradiation with ionizing radiation. Ionizing radiation refers to electromagnetic waves or charged particle beams that have an energy quantum capable of polymerizing or crosslinking molecules. The electromagnetic waves may be any of ultraviolet rays (UV), X-rays, and gamma rays. The charged particle beam may be any of electron beams (EB), alpha rays, and ion beams. Among ionizing radiation curable resins, resins that crosslink upon irradiation with ultraviolet rays may be referred to as ultraviolet curable resins. Among ionizing radiation curable resins, resins that crosslink upon irradiation with electron beams may be referred to as electron beam curable resins. The ionizing radiation curable resin composition may contain an initiator for initiating crosslinking of the ionizing radiation curable resin.

[0259] In the ionizing radiation-curable resin composition contained in the ionizing radiation-curable resin composition, the ionizing radiation-curable resin may contain a functional group having an ethylenic double bond, such as a (meth)acryloyl group, an acrylic group, a vinyl group, or an allyl group. The ionizing radiation-curable resin may contain one or more of an epoxy group and an oxetanyl group. The ionizing radiation-curable resin may contain an ethylenically unsaturated bond group. The ionizing radiation-curable resin may contain a siloxane bond.

[0260] The surface layer 27 may include a plurality of diffusing materials 270. The diffusing materials 270 diffuse light within the surface layer 27. The plurality of diffusing materials 270 may be dispersed within the surface layer 27. The decorative sheet 20 may have a matte texture on the first surface 20a due to the surface layer 27 including the diffusing materials 270. The diffusing materials 270 may be inorganic particles such as silica particles, or organic particles such as urethane particles.

[0261] As shown in Fig. 20 , the decorative sheet 20 may include linearly extending decorative portions 21 and linearly extending non-decorative portions 22. In the decorative sheet 20 of Fig. 20 , the decorative portions 21 and non-decorative portions 22 are alternately arranged in an arrangement direction DNA. In Fig. 20 , the arrangement direction DNA is a direction perpendicular to the first direction D1 and extends between the second direction D2 and the third direction D3 in a circumferential direction centered on the first direction D1. The arrangement direction DNA is a direction perpendicular to the boundary between the decorative portions 21 and the non-decorative portions 22.

[0262] Fig. 20 shows pitches PTX and PTY of multiple non-decorative portions 22. In Fig. 20, the pitches PTX and PTY are the minimum pitch PM. In the non-decorative portions 22, the minimum pitch PM may be greater than the maximum width LM. In the decorative sheet 20 of Fig. 20, the minimum pitch PM of the non-decorative portions 22 is greater than the maximum width LM of the non-decorative portions 22.

[0263] The decorative member 40 may have a curved shape on the first surface 40a, as shown in Fig. 21. The illustrated decorative member 40 has a three-dimensional shape and a curved shape on the first surface 40a. The illustrated decorative member 40 has a shape that is convex toward the first side in the first direction D1 at the central portion in the second direction D2 and the central portion in the third direction D3. The decorative member 40 is curved about at least two axes, an axis parallel to the second direction D2 and an axis parallel to the third direction D3.

[0264] An embodiment of the present disclosure will be described in more detail with reference to examples, but the present disclosure is not limited to the following examples.

[0265] Decorative sheets according to Examples 1 to 27, a decorative member according to Example 28, display systems according to Examples 29 to 32, and decorative sheets according to Comparative Examples 1 to 6 were produced. The decorative member according to Example 28 included a decorative sheet and a thermoplastic resin part superimposed on the decorative sheet. The display systems according to Examples 29 to 32 included a light-emitting device and a decorative sheet superimposed on the light-emitting surface of the light-emitting device. The display systems according to Examples 29 to 32 included the decorative sheet according to Example 18 described below. In the display systems according to Examples 29 to 32, the decorative sheet was superimposed on the light-emitting device from the second surface side. Each decorative sheet was produced by the method described above. The produced decorative sheet had a first surface and a second surface opposite the first surface. In the decorative member according to Example 28, the thermoplastic resin part was superimposed on the second surface of the decorative sheet. In the display systems according to Examples 29 to 32, the decorative sheet was superimposed on the light-emitting surface of the light-emitting device from the second surface side.

[0266] The decorative sheets of Examples 1 to 11, 13 to 24, 26, and 27, the decorative sheet included in the decorative member of Example 28, and the decorative sheets of Comparative Examples 1 to 3 had decorative portions that formed a design and non-decorative portions that did not form a design.

[0267] The decorative sheets according to Examples 1 to 11 and 20 to 24 included a base layer, a bonding layer, and a surface layer in this order from the second surface to the first surface in the non-decorated portion. The decorative sheets according to Examples 1 to 11 and 20 to 24 included a base layer, a light-shielding layer, a design layer, a bonding layer, and a surface layer in this order from the second surface to the first surface in the decorated portion.

[0268] The decorative sheets according to Examples 13 and 14 included a base layer and a surface layer in this order from the second surface to the first surface in the non-decorated portion. The decorative sheets according to Examples 13 and 14 included a base layer, a light-shielding layer, a design layer, and a surface layer in this order from the second surface to the first surface in the decorated portion.

[0269] The decorative sheets according to Examples 15 to 19, 26, and 27, the decorative sheet included in the decorative member according to Example 28, and the decorative sheets according to Comparative Examples 4 and 6 included a base material layer in the non-decorated portion from the second surface to the first surface. The decorative sheets according to Examples 15 to 19, 26, and 27, the decorative sheet included in the decorative member according to Example 28, and the decorative sheets according to Comparative Examples 4 and 6 included a base material layer, a light-shielding layer, and a design layer in this order in the decorated portion from the second surface to the first surface.

[0270] The decorative sheets of Examples 12 and 25 and Comparative Example 5 included only decorative portions forming a design. The decorative sheets of Examples 12 and 25 and Comparative Example 5 did not include non-decorative portions. Each decorative sheet included a design layer and a base layer, in this order, from the second surface to the first surface.

[0271] Example 1 A 125 μm-thick film ("SD015NAH" manufactured by Kaneka Corporation) was used as the substrate layer. A coating film was formed by applying a resin composition to one side of the substrate layer. The resin composition contained a resin (acrylic resin and vinyl chloride-vinyl acetate copolymer) constituting the binder resin of the light-shielding layer, light-absorbing particles (carbon black), and a solvent (methyl ethyl ketone (MEK), ethyl acetate, butyl acetate, normal propyl acetate, methyl isobutyl ketone (MIBK), and isobutyl acetate). The resin composition was dried to obtain a light-shielding layer. The light-shielding layer had a thickness of 4.0 μm. Ink was printed on the light-shielding layer. The ink contained coloring materials (inorganic pigment and photoluminescent pigment). A design layer was obtained by drying the ink. The design layer had a first geometric pattern as a design. The design layer had a thickness of 4.0 μm. The decorative layer and the light-shielding layer were removed by laser etching from the non-decorative portions. The non-decorative portions were arranged in a two-dimensional pattern. Each non-decorative portion had a circular shape with a diameter of 60 μm.

[0272] The base layer was exposed in the areas where the design layer and the light-shielding layer had been removed. An adhesive layer was overlaid on the base layer, the design layer, and the light-shielding layer. The adhesive layer was an acrylic adhesive ("CS9862UAS" manufactured by Nitto Denko Corporation) with a thickness of 50 μm. A surface layer was overlaid on the adhesive layer. An acrylic resin film ("SD015NAH" manufactured by Kaneka Corporation) with a thickness of 125 μm was used as the surface layer. In this manner, the decorative sheet of Example 1 was obtained.

[0273] Example 2 The decorative sheet according to Example 2 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 2, the design layer had a second geometric pattern as the design.

[0274] Example 3 The decorative sheet according to Example 3 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 3, the design layer had a third geometric pattern as the design.

[0275] Example 4 The decorative sheet according to Example 4 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 4, the design layer had a fourth geometric pattern as the design.

[0276] Example 5 The decorative sheet according to Example 5 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 5, the design layer had a fifth geometric pattern as the design.

[0277] Example 6 The decorative sheet according to Example 6 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 6, the design layer had a sixth geometric pattern as the design.

[0278] Example 7 The decorative sheet according to Example 7 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 7, the design layer had a seventh geometric pattern as the design.

[0279] Example 8 The decorative sheet according to Example 8 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 8, the design layer had a ninth geometric pattern as the design.

[0280] Example 9 The decorative sheet according to Example 9 had the same configuration as the decorative sheet according to Example 8, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 9, the non-decorative portions had a diameter of 54 μm.

[0281] Example 10 The decorative sheet according to Example 10 had the same configuration as the decorative sheet according to Example 8, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 10, the non-decorative portions had a diameter of 93 μm.

[0282] Example 11 The decorative sheet according to Example 11 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer and the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 11, the design layer had a first wood grain pattern as the design. In the decorative sheet according to Example 11, the non-decorative portions had a diameter of 58 μm.

[0283] Example 12 As described above, the decorative sheet according to Example 12 did not include a non-decorative portion. A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the substrate layer. Ink was screen-printed onto the substrate layer. The ink contained a binder resin and a colorant. The binder resin was a urethane-based resin. The colorant contained a red interference pigment, a green interference pigment, and a blue interference pigment. Each of the red interference pigment, green interference pigment, and blue interference pigment was titanium dioxide-coated mica. A design layer was obtained by drying the ink. The design layer had a second wood grain pattern. The thickness of the design layer was 20 μm. In this manner, the decorative sheet according to Example 12 was obtained.

[0284] Example 13 In the decorative sheet according to Example 13, the base layer, design layer, and light-shielding layer had the same configurations as those of the decorative sheet according to Example 8. The decorative sheet according to Example 13 differed from the decorative sheet according to Example 8 in the configuration of the surface layer. In the decorative sheet according to Example 13, the surface layer was formed from an ionizing radiation curable resin composition. The ionizing radiation curable resin composition contained an ionizing radiation curable resin and a plurality of diffusing materials. The ionizing radiation curable resin was an electron beam curable resin. The electron beam curable resin was urethane acrylate. The diffusing material was urethane particles. The particle size of the urethane particles was 2 μm.

[0285] When producing the decorative sheet according to Example 13, an ionizing radiation curable resin composition was printed by gravure coating so as to be in contact with the base layer, the design layer, and the light-shielding layer. The weight of the printed ionizing radiation curable resin composition was 11 g / m ２The ionizing radiation curable resin composition was irradiated with an electron beam at an acceleration voltage of 165 kV and an exposure dose of 50 kGy (5 Mrad), thereby curing the ionizing radiation curable resin. In this manner, a surface layer was formed. The thickness of the surface layer was 9 μm in the decorated portion. The thickness of the surface layer was 14 μm in the non-decorated portion. The decorative sheet of Example 13 had a matte texture when observed from the first surface.

[0286] Example 14 The decorative sheet according to Example 14 had the same configuration as the decorative sheet according to Example 13, except for the configuration of the diffusing material contained in the ionizing radiation curable resin composition. The particle size of the urethane particles was 5 μm. The decorative sheet according to Example 14 had a matte texture when observed from the first surface.

[0287] Example 15 A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the substrate layer. The same resin composition as in Example 1 was applied to one surface of the substrate layer to form a coating film, thereby obtaining a light-shielding layer. The light-shielding layer had a thickness of 4.0 μm.

[0288] Ink was printed on the light-shielding layer. The ink was printed by gravure printing for each color. Silver ink was gravure-printed on the light-shielding layer. The silver ink contained 5 parts by mass of aluminum pigment as a luster pigment. A linear design was formed on the light-shielding layer by gravure printing of the silver ink. After gravure printing of the silver ink, cyan ink, magenta ink, yellow ink, and black ink were gravure-printed on the light-shielding layer. A portion of the above-mentioned linear design was concealed by any of the cyan ink, magenta ink, yellow ink, and black ink. A design layer was obtained by drying the ink. The thickness of the design layer was 4.0 μm. In this manner, a laminate was obtained having, from the second surface to the first surface, a base layer, a light-shielding layer, and a design layer in this order.

[0289] In the portions that would become non-decorative areas, the design layer and the light-shielding layer were removed by laser etching. During the laser etching, the laminate was moved relative to the laser irradiation device. The laminate was moved roll-to-roll relative to the laser irradiation device. That is, the laminate was moved relative to the laser irradiation device by being wound from one roll to another. The laser was irradiated from the second surface side of the laminate. The design layer and the light-shielding layer were removed in the portions that would become non-decorative areas by the laser that had passed through the base layer.

[0290] A decorative sheet according to Example 15 was obtained by forming a plurality of non-decorative portions. In the decorative sheet according to Example 15, the plurality of non-decorative portions were arranged two-dimensionally. Each of the plurality of non-decorative portions had a circular shape with a diameter of 56 μm. The minimum value of the center-to-center distance between two adjacent non-decorative portions was 120 μm. In the decorative sheet according to Example 15, the design layer had a third wood grain pattern as a design. The third wood grain pattern had a silver linear design.

[0291] Example 16 The decorative sheet according to Example 16 had the same configuration as the decorative sheet according to Example 15, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 16, the non-decorative portions had a diameter of 58 μm.

[0292] Example 17 The decorative sheet according to Example 17 had the same configuration as the decorative sheet according to Example 15, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 17, the non-decorative portions had a diameter of 60 μm.

[0293] Example 18 The decorative sheet according to Example 18 had the same configuration as the decorative sheet according to Example 15, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 18, the non-decorative portions had a diameter of 76 μm.

[0294] Example 19 The decorative sheet according to Example 19 had the same configuration as the decorative sheet according to Example 15, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 19, the non-decorative portions had a diameter of 93 μm.

[0295] Example 20 The decorative sheet according to Example 20 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Example 20, the design layer had an eighth geometric pattern as a design. In the decorative sheet according to Example 20, the non-decorative portion had a diameter of 59 μm.

[0296] Example 21 The decorative sheet according to Example 21 had the same configuration as the decorative sheet according to Example 1, except for the shapes of the decorative and non-decorative portions formed by laser etching and the design of the design layer. As described with reference to FIG. 20 , the decorative sheet according to Example 21 included linearly extending decorative portions and linearly extending non-decorative portions. In the decorative sheet according to Example 21, the decorative and non-decorative portions were alternately arranged in the arrangement direction. In the decorative sheet according to Example 21, the pitch between two adjacent non-decorative portions in the arrangement direction was 70 μm. The dimension of the non-decorative portions in the arrangement direction was 35 μm. In the decorative sheet according to Example 21, the design layer had a first pebbled pattern as a design.

[0297] Example 22 The decorative sheet according to Example 22 had the same configuration as the decorative sheet according to Example 21, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 22, the pitch between two adjacent non-decorative portions in the arrangement direction was 58 μm.

[0298] Example 23 The decorative sheet according to Example 23 had the same configuration as the decorative sheet according to Example 1, except for the diameter of the non-decorative portions formed by laser etching and the design of the design layer. In the decorative sheet according to Example 23, the non-decorative portions had a diameter of 68 μm. In the decorative sheet according to Example 23, the design layer had a second pebbles pattern as a design.

[0299] Example 24 The decorative sheet according to Example 24 had the same configuration as the decorative sheet according to Example 23, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Example 24, the non-decorative portions had a diameter of 58 μm.

[0300] Example 25 As described above, the decorative sheet according to Example 25 did not include a non-decorative portion. A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the base layer. Ink was printed on the base layer. The ink contained coloring materials (inorganic pigment, organic pigment, and luster pigment). A design layer was obtained by drying the ink. The design layer had a fourth wood grain pattern. The thickness of the design layer was 10 μm. A surface layer was superimposed on the design layer. A film made of acrylic resin having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the surface layer. In this manner, the decorative sheet according to Example 25 was obtained.

[0301] Example 26 The decorative sheet according to Example 26 had the same configuration as the decorative sheet according to Example 15, except for the laser etching method, the diameter of the non-decorative portion, and the minimum center-to-center distance between two adjacent non-decorative portions. In producing the decorative sheet according to Example 26, a laser marker ("MD-X2000" manufactured by Keyence Corporation) was used for laser etching. In the laser etching, the non-decorative portion was formed by moving the laser marker while the laminate was fixed. The laminate had a flat plate-like shape. In the decorative sheet according to Example 26, the non-decorative portion had a diameter of 55 μm. In the decorative sheet according to Example 26, the minimum center-to-center distance between two adjacent non-decorative portions was 90 μm.

[0302] Example 27 The decorative sheet according to Example 27 had the same configuration as the decorative sheet according to Example 26, except for the shape of the non-decorative portion. In the decorative sheet according to Example 27, the non-decorative portion had an elliptical shape. The long axis of the elliptical shape was 63 μm. The short axis of the elliptical shape was 50 μm.

[0303] Example 28 A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the substrate layer. The same resin composition as in Example 1 was applied to one surface of the substrate layer to form a coating film, thereby obtaining a light-shielding layer. The light-shielding layer had a thickness of 4.0 μm.

[0304] Ink was printed on the light-shielding layer. The ink was printed by gravure printing for each color. The ink contained a photoluminescent pigment or an organic pigment as a colorant. Silver ink was printed on the light-shielding layer. The silver ink contained 5 parts by mass of aluminum pigment as a colorant. A linear design was formed on the light-shielding layer by printing the silver ink. After printing the silver ink, cyan ink, magenta ink, yellow ink, and black ink were printed on the light-shielding layer. A portion of the above-mentioned linear design was concealed by any of the cyan ink, magenta ink, yellow ink, and black ink. A design layer was obtained by drying the ink. The design layer had a third wood grain pattern as a design. The thickness of the design layer was 4.0 μm. In this way, a laminate was obtained having, from the second surface to the first surface, a base layer, a light-shielding layer, and a design layer in this order.

[0305] The laminate was placed in an injection molding device. The injection molding device included a first mold and a second mold. A cavity was formed between the first mold and the second mold. A gate was provided in the second mold. The laminate was placed in the cavity. In the cavity, a first surface of the laminate faced the first mold. The surface of the first mold facing the cavity had a curved shape. In the cavity, a second surface of the laminate faced the second mold. In the cavity, an injection resin was injected toward the second surface of the laminate. The injection resin was supplied from a resin supply device into the cavity through the gate. The injection resin injected into the cavity pressed the laminate toward the first mold. A thermoplastic resin portion bonded to the decorative sheet was formed by solidifying the injection resin. The injection resin was polycarbonate.

[0306] The laminate and thermoplastic resin portion were removed from the cavity. The design layer and light-shielding layer were removed by laser etching in the non-decorative portions of the decorative member. A laser marker (MD-X2000 manufactured by Keyence Corporation) was used for the laser etching. In the laser etching, the non-decorative portions were formed by moving the laser marker while the laminate was fixed. In this manner, the decorative member of Example 28 was produced. In the decorative member of Example 28, the non-decorative portions were arranged two-dimensionally. Each non-decorative portion had a circular shape with a diameter of 50 μm. The minimum center-to-center distance between two adjacent non-decorative portions was 90 μm. The decorative member of Example 28 had a curved shape on the first surface. The curved shape on the first surface was the same as the curved shape of the first mold.

[0307] Example 29 The decorative sheet according to Example 18 was placed on the light-emitting surface of a light-emitting device ("FW279S" manufactured by Shenzhen Feelworld Technology Co., Ltd.) from the second surface side. By placing the decorative sheet and the light-emitting device together, a display system according to Example 29 was obtained. In the display system according to Example 29, a gap was provided between the second surface and the light-emitting surface.

[0308] Example 30 The display system according to Example 30 included a joint between the light-emitting device and the decorative sheet. The joint joined the decorative sheet and the light-emitting device. When the decorative sheet and the light-emitting device were joined by the joint, it was confirmed with the naked eye that no air bubbles were observed on the display surface. The thickness of the joint layer was 0.1 mm. The joint was made of first-class glycerin (manufactured by Junsei Chemical Co., Ltd.). In other respects, the display system according to Example 30 had the same configuration as the display system according to Example 29.

[0309] Example 31 The decorative sheet according to Example 18 was placed on the light-emitting surface of a light-emitting device ("E2011Ht" manufactured by Dell Technologies Inc.) from the second surface side. By placing the decorative sheet and the light-emitting device together, a display system according to Example 31 was obtained. In the display system according to Example 31, a gap was provided between the second surface and the light-emitting surface.

[0310] Example 32 The display system according to Example 32 included a joint between the light-emitting device and the decorative sheet. The joint joined the decorative sheet and the light-emitting device. When the decorative sheet and the light-emitting device were joined by the joint, it was confirmed with the naked eye that no air bubbles were observed on the display surface. The thickness of the joint layer was 0.1 mm. The joint was made of first-class glycerin (manufactured by Junsei Chemical Co., Ltd.). In other respects, the display system according to Example 32 had the same configuration as the display system according to Example 31.

[0311] <Comparative Example 1> The decorative sheet according to Comparative Example 1 had the same configuration as the decorative sheet according to Example 1, except for the design of the design layer. In the decorative sheet according to Comparative Example 1, the design layer had a 10th geometric pattern as the design.

[0312] <Comparative Example 2> The decorative sheet according to Comparative Example 2 had the same configuration as the decorative sheet according to Comparative Example 1, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Comparative Example 2, the non-decorative portions had a diameter of 64 μm.

[0313] <Comparative Example 3> The decorative sheet according to Comparative Example 3 had the same configuration as the decorative sheet according to Comparative Example 1, except for the diameter of the non-decorative portions formed by laser etching. In the decorative sheet according to Comparative Example 3, the non-decorative portions had a diameter of 54 μm.

[0314] Comparative Example 4 A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the substrate layer. The same resin composition as in Example 1 was applied to one surface of the substrate layer to form a coating film, thereby obtaining a light-shielding layer. The light-shielding layer had a thickness of 4.0 μm.

[0315] Ink was printed on the light-shielding layer. The ink was printed by color by gravure printing. The ink contained a photoluminescent pigment or an organic pigment as a colorant. White ink was printed on the light-shielding layer as a background color. The white ink contained titanium dioxide as a colorant. After printing the white ink, cyan ink, magenta ink, yellow ink, and black ink were gravure printed on the light-shielding layer. A design layer was obtained by drying the ink. The thickness of the design layer was 4.0 μm. In this way, a laminate was obtained having, from the second surface to the first surface, a base layer, a light-shielding layer, and a design layer in this order.

[0316] In the portions that would become non-decorative areas, the design layer and the light-shielding layer were removed by laser etching. During the laser etching, the laminate was moved relative to the laser irradiation device. The laminate was moved roll-to-roll relative to the laser irradiation device. That is, the laminate was moved relative to the laser irradiation device by being wound from one roll to another. The laser was irradiated from the second surface side of the laminate. The design layer and the light-shielding layer were removed in the portions that would become non-decorative areas by the laser that had passed through the base layer.

[0317] A decorative sheet according to Comparative Example 4 was obtained by forming a plurality of non-decorative portions. In the decorative sheet according to Comparative Example 4, the plurality of non-decorative portions were arranged two-dimensionally. Each of the plurality of non-decorative portions had a circular shape with a diameter of 59 μm. The minimum center-to-center distance between two adjacent non-decorative portions was 120 μm. In the decorative sheet according to Comparative Example 4, the design layer had a fifth wood grain pattern as a design.

[0318] Comparative Example 5 A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the base layer. A design layer was formed uniformly over the entire surface by gravure coating silver ink on one side of the base layer. The silver ink contained aluminum pigment as a luster pigment. The aluminum pigment was contained in an amount of 15 parts by weight per 100 parts by weight of binder resin. The design layer had a thickness of 4.0 μm. In the decorative sheet according to Comparative Example 5, the design layer was monochromatic. The design in the design layer of the decorative sheet according to Comparative Example 5 did not include a pattern.

[0319] Comparative Example 6 A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the substrate layer. The same resin composition as in Example 1 was applied to one surface of the substrate layer to form a coating film, thereby obtaining a light-shielding layer. The light-shielding layer had a thickness of 4.0 μm.

[0320] The ink was gravure printed onto the light-shielding layer. The inks were printed by gravure printing for each color. The inks included silver ink, cyan ink, magenta ink, yellow ink, black ink, and white ink. Of the silver ink, cyan ink, magenta ink, yellow ink, black ink, and white ink, the ink contained the most silver ink. The silver ink contained aluminum pigment as a luster pigment. The aluminum pigment was contained in an amount of 15 parts by weight per 100 parts by weight of binder resin. The cyan ink, magenta ink, yellow ink, black ink, and white ink did not include any overlapping portion with the silver ink. A design layer was obtained by drying the ink. The thickness of the design layer was 4.0 μm. In this manner, a laminate was obtained having, from the second surface to the first surface, a base layer, a light-shielding layer, and a design layer in this order.

[0321] In the non-decorative areas, the design layer and the light-shielding layer were removed by laser etching. During the laser etching, the laminate was moved relative to a laser irradiation device. During the laser etching, the laminate had a roll-like shape. The laser was irradiated from the second surface side of the laminate. The design layer and the light-shielding layer were removed in the non-decorative areas by the laser that had passed through the base layer.

[0322] A decorative sheet according to Comparative Example 6 was obtained by forming a plurality of non-decorative portions. In the decorative sheet according to Comparative Example 6, the plurality of non-decorative portions were arranged two-dimensionally. Each of the plurality of non-decorative portions had a circular shape with a diameter of 58 μm. The minimum center-to-center distance between two adjacent non-decorative portions was 120 μm. In the decorative sheet according to Comparative Example 6, the design layer had an eleventh geometric pattern as a design.

[0323] The measurement results, calculation results, and evaluation results of the decorative sheets according to Examples 1 to 7 are shown in Table 3. The measurement results, calculation results, and evaluation results of the decorative sheets according to Examples 8 to 14 are shown in Table 4. The measurement results, calculation results, and evaluation results of the decorative sheets according to Comparative Examples 1 to 3 are shown in Table 5. The measurement results, calculation results, and evaluation results of the decorative sheets according to Examples 15 to 21 are shown in Table 6. The measurement results, calculation results, and evaluation results of the decorative sheets according to Examples 22 to 27 and the decorative member according to Example 28 are shown in Table 7. The measurement results, calculation results, and evaluation results of the decorative sheets according to Comparative Examples 4 to 6 are shown in Tables 5 and 8.

[0324] <Total Light Transmittance> The total light transmittance was measured for each example and comparative example. A haze meter (HM-150N) manufactured by Murakami Color Research Laboratory was used to measure the total light transmittance in accordance with JIS K 7361-1:1997. The measurement results are shown in the "Total Light Transmittance [%]" column in Tables 3 to 8 below.

[0325] <L by SCI method ＊ For the decorative sheets and decorative members according to each example and each comparative example, the L value was measured by the reflected light with the first surface as the incident surface. ＊ a ＊ b ＊L in color system ＊ The value was measured by the SCI method. ＊ The values ​​were measured by the above-mentioned method using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in the "SCI L" column in Tables 3 to 8 below. ＊ The values ​​are shown in the "Value" column.

[0326] <L by SCE method ＊ For the decorative sheets and decorative members according to each example and each comparative example, the L value was measured by the reflected light with the first surface as the incident surface. ＊ a ＊ b ＊ L in color system ＊ The value was measured by the SCE method. ＊ The values ​​were measured by the above-mentioned method using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in the "SCE L" column in Tables 3 to 8 below. ＊ The values ​​are shown in the "Value" column.

[0327] <L in SCI method for total light transmittance ＊ Ratio of the above-mentioned L measured by the SCI method to the total light transmittance measured for the decorative sheet and decorative member according to each Example and Comparative Example. ＊ The ratio of the values ​​was calculated, and the calculation results are shown in the column "SCI / Transmittance" in Tables 3 to 8 below.

[0328] <L in SCE method for total light transmittance ＊ Ratio of the above-mentioned L measured by the SCE method to the total light transmittance measured for the decorative sheet and decorative member according to each Example and Comparative Example. ＊ The ratio of the values ​​was calculated, and the calculation results are shown in the column "SCE / Transmittance" in Tables 3 to 8 below.

[0329] <High-brightness reflective area> The proportion of high-brightness reflective area was calculated by the method described above for the decorative sheets according to Examples 1 to 10 and Comparative Examples 1 to 3. The calculation results are shown in the "High-brightness reflective area" column in Tables 3 to 5 below. Note that the notation "-" in the "High-brightness reflective area" column for the decorative sheets according to Examples 11 to 14 and Comparative Examples 4 to 6 means that the proportion of high-brightness reflective area was not calculated for these decorative sheets.

[0330] <High-brightness display area> A commercially available surface light source device and a pattern mask were prepared. The pattern mask had an opening area. The opening area displayed the character string "ECO." The area of ​​the opening area corresponding to the character "E" was 2,600,000 μm. ２ In the open region, the area of ​​the open region corresponding to the letter "C" was 3,000,000 μm ２ The area of ​​the opening region corresponding to the letter "O" was 4,100,000 μm ２ A pattern mask was placed on the light-emitting surface of the surface light source device to form a display device.

[0331] An optical microscope (Keyence Corporation, "VHX-2000") was prepared. The optical microscope included an imaging device. The imaging device included a lens device (Keyence Corporation, VH-Z20R). The lens device included an objective lens and an illumination unit capable of the above-mentioned one-way illumination. A standard white plate was placed on the stage of the optical microscope. The white plate included in the white calibration cap of the Konica Minolta Inc. spectrophotometer "CM-700d" was used as the standard white plate. The standard white plate was placed on the stage so that its center of gravity faced the objective lens. The distance between the objective lens and the standard white plate was 300 mm. Light was irradiated onto the standard white plate placed on the stage from the illumination unit of the lens device using the above-mentioned one-way illumination. The angle of incidence of light irradiated from the illumination unit onto the standard white plate was 21.75°. A luminance meter (CS-100A manufactured by Konica Minolta, Inc.) was aimed at the center of gravity of the standard white board in this state, and the luminance was measured. The measured luminance was 10,000 cd / m for 1 minute. ２ ~30000cd / m ２It was confirmed that the luminance meter was positioned in the range of 100°. The measurement angle of the luminance meter was 45°. The distance between the center of gravity of the standard white board and the luminance meter was 30 cm.

[0332] The decorative sheets according to Examples 1 to 10 and Comparative Examples 1 to 3 were overlaid on a display device. A display system was formed including the decorative sheets according to Examples 1 to 10 and Comparative Examples 1 to 3. The display system was placed on the stage of an optical microscope. On the stage, the display system was positioned so that the character string "ECO" on the pattern mask could be imaged by the imaging device. The distance between the objective lens and the display surface was 30 mm.

[0333] In the display system, a light-adjusting filter ("ND filter" manufactured by Fujifilm Corporation) was placed on the display device. The surface light source device was turned on. The above-mentioned luminance meter was aimed at the first region of the display system, and the luminance was measured. The measurement angle of the luminance meter was 45°. The distance between the first region of the display system and the luminance meter was 30 cm. The amount of light from the display device was adjusted by the light-adjusting filter so that the ratio of the luminance measured in the first region of the display system to the luminance measured at the center of gravity of the standard white board was 45,000:1,000.

[0334] In a display system including the decorative sheets of Examples 1 to 10 and Comparative Examples 1 to 3, the illumination unit of the lens device was turned on, and the display surface of the display system was illuminated by one-sided illumination. A first light was irradiated from the illumination unit onto the first surface of the decorative sheet. The surface light source device was turned on. A second light was irradiated from the surface light source device onto the second surface of the decorative sheet. In this state, the opening region was imaged to obtain a grayscale image of the display surface. From the obtained grayscale image, the area of ​​the high-brightness display region was calculated using the method described above. The area of ​​the calculated high-brightness display region was calculated to determine how many times larger it was than the area of ​​the above-mentioned opening region. The calculation results are shown in the "High-brightness display region" column of Tables 3 to 5. Note that the notation "-" in the "High-brightness display region" column for the decorative sheets of Examples 11 to 14 and Comparative Examples 4 to 6 means that the proportion of the area of ​​the high-brightness display region was not calculated for these decorative sheets.

[0335] <Pixel Value Variation of Grayscale Images> An optical microscope (Keyence Corporation, "VHX-2000") was prepared. The optical microscope included an imaging device. The imaging device included a lens device (Keyence Corporation, VH-Z20R). The lens device included an objective lens and an illumination unit capable of the above-mentioned one-way illumination. A standard white plate was placed on the stage of the optical microscope. The white plate included in the white calibration cap of the Konica Minolta Inc. spectrophotometer "CM-700d" was used as the standard white plate. The standard white plate was placed on the stage so that its center of gravity faced the objective lens. The distance between the objective lens and the standard white plate was 300 mm. Light was irradiated onto the standard white plate placed on the stage from the illumination unit of the lens device using the above-mentioned one-way illumination. The angle of incidence of light irradiated onto the standard white plate from the illumination unit was 21.75°. A luminance meter (CS-100A manufactured by Konica Minolta, Inc.) was aimed at the center of gravity of the standard white board in this state, and the luminance was measured. The measured luminance was 10,000 cd / m for 1 minute. ２ ~30000cd / m ２ It was confirmed that the luminance meter was positioned in the range of 100°. The measurement angle of the luminance meter was 45°. The distance between the center of gravity of the standard white board and the luminance meter was 30 cm.

[0336] The decorative sheets according to Examples 1 to 14 and Comparative Examples 1 to 6 were placed on the stage of an optical microscope with the second surface facing up. A grayscale image of the first surface of the decorative sheet placed on the stage was acquired using an imaging device. The settings of the imaging device were as follows: Shutter speed: Auto Gain: Preset 6 dB Brightness adjustment: MAX

[0337] The variation in pixel value was calculated from the grayscale image by the method described above for the decorative sheets according to Examples 1 to 14 and Comparative Examples 1 to 6. The calculation results are shown in the "Pixel Value Variation" column in Tables 3 to 5 below.

[0338] <L by SCI method ＊ Variation in L＊ The difference between the maximum and minimum values ​​for the value was determined from the measurements made by the SCI method. The determination method is as described above. The determination results are shown in the "SCI L" column in Tables 6 to 8 below. ＊ The values ​​are shown in the "Value Variation" column.

[0339] <L by SCE method ＊ Variation in L ＊ The difference between the maximum and minimum values ​​for the value was determined from the measurements made by the SCE method. The determination method is as described above. The determination results are shown in the "SCE L" columns in Tables 6 to 8 below. ＊ The values ​​are shown in the "Value Variation" column.

[0340] <Variation in Total Light Transmittance> For the decorative sheets according to Examples 15 to 27, the decorative member according to Example 28, and the decorative sheets according to Comparative Examples 4 to 6, 25 measured values ​​for total light transmittance were obtained using the method described above. From the maximum, minimum, and average values ​​of the 25 measured values ​​for total light transmittance, the percentage of the difference between the maximum and minimum values ​​relative to the average value was calculated. The calculation results are shown in the "Transmittance Variation [%]" column in Tables 6 to 8 below.

[0341] <L of display surface by SCI method> ＊ For the display systems according to Examples 29 to 32, the L ＊ a ＊ b ＊ L in color system ＊ The value was measured by the SCI method. ＊ The values ​​were measured by the above-mentioned method using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in the "SCI L" column in Table 9 below. ＊ The value is shown in the "Display Surface" column.

[0342] <L of display surface by SCE system ＊ For the display systems according to Examples 29 to 32, the L ＊ a＊ b ＊ L in color system ＊ The value was measured by the SCE method. ＊ The values ​​were measured by the above-mentioned method using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in Table 9 below under "SCE L ＊ The value is shown in the "Display Surface" column.

[0343] <L of light-emitting surface by SCI method ＊ For the light-emitting devices of the display systems according to Examples 29 to 32, the L ＊ a ＊ b ＊ L in color system ＊ The value was measured by the SCI method. ＊ The values ​​were measured by the above-mentioned method using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in the "SCI L" column in Table 9 below. ＊ The value is shown in the "Light Emitting Surface" column.

[0344] <L of light-emitting surface by SCE method ＊ For the light-emitting devices of the display systems according to Examples 29 to 32, the L ＊ a ＊ b ＊ L in color system ＊ The value was measured by the SCE method. ＊ The values ​​were measured by the above-mentioned method using a spectrophotometer (CM-700d manufactured by Konica Minolta, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in Table 9 below under "SCE L ＊ The value is shown in the "Light Emitting Surface" column.

[0345] <Evaluation 1> The lighting unit of the lens device was turned on, and the display surface of the display system was illuminated by one-sided lighting. In this state, an imaging device was used to obtain grayscale images of the display surface of the display system including the decorative sheets of each Example and Comparative Example. The obtained grayscale images were observed by 10 observers, and the visibility of the images was evaluated based on the following evaluation criteria. The evaluation results of Evaluation 1 are shown in the "Evaluation 1" column of Tables 3 to 5.

[0346] <Evaluation Criteria for Evaluation 1> AA: Eight or more observers were able to observe the character string "ECO". A: Six to seven observers were able to observe the character string "ECO". B: Five observers were able to observe the character string "ECO". C: Four or fewer observers were able to observe the character string "ECO".

[0347] <Evaluation 2> The decorative sheets according to Examples 1 to 27, the decorative member according to Example 28, and the decorative sheets according to Comparative Examples 1 to 6 were placed with the second side facing up onto a support surface illuminated with an illuminance of 750 lx. In this state, the first side of each decorative sheet or the first side of the decorative member was observed, and the design was evaluated based on the following evaluation criteria. The evaluation results of Evaluation 2 are shown in the "Evaluation 2" column of Tables 6 to 8.

[0348] <Evaluation Criteria for Evaluation 2> AA: Six or more observers recognized the pattern. A: Four to five observers recognized the pattern. B: One to three observers recognized the pattern. C: None of the observers recognized the pattern.

[0349] <Evaluation 3> A commercially available surface light source device and a pattern mask were prepared. The pattern mask had an opening region. The opening region displayed the character string "ECO." The area of ​​the opening region corresponding to the letter "E" was 2,600,000 μm. ２ In the open region, the area of ​​the open region corresponding to the letter "C" was 3,000,000 μm ２ The area of ​​the opening region corresponding to the letter "O" was 4,100,000 μm ２ A pattern mask was placed on the light-emitting surface of the surface light source device to form a display device.

[0350] An optical microscope (Keyence Corporation, "VHX-2000") was prepared. The optical microscope included an imaging device. The imaging device included a lens device (Keyence Corporation, VH-Z20R). The lens device included an objective lens and an illumination unit capable of the above-mentioned one-way illumination. A standard white plate was placed on the stage of the optical microscope. The white plate included in the white calibration cap of the Konica Minolta Inc. spectrophotometer "CM-700d" was used as the standard white plate. The standard white plate was placed on the stage so that its center of gravity faced the objective lens. The distance between the objective lens and the standard white plate was 300 mm. Light was irradiated onto the standard white plate placed on the stage from the illumination unit of the lens device using the above-mentioned one-way illumination. The angle of incidence of light irradiated from the illumination unit onto the standard white plate was 21.75°. A luminance meter (CS-100A manufactured by Konica Minolta, Inc.) was aimed at the center of gravity of the standard white board in this state, and the luminance was measured. The measured luminance was 10,000 cd / m for 1 minute. ２ ~30000cd / m ２ It was confirmed that the luminance meter was positioned in the range of 100°. The measurement angle of the luminance meter was 45°. The distance between the center of gravity of the standard white board and the luminance meter was 30 cm.

[0351] The decorative sheets according to Examples 15 to 27, the decorative member according to Example 28, and the decorative sheets according to Comparative Examples 4 to 6 were layered on a display device. This resulted in a display system including the decorative sheets according to Examples 15 to 27 and Comparative Examples 4 to 6, or the decorative member according to Example 26. The display system was placed on the stage of an optical microscope. On the stage, the display system was positioned so that the character string "ECO" on the pattern mask could be imaged by the imaging device. The distance between the objective lens and the display surface was 30 mm.

[0352] In the display system, a light-adjusting filter ("ND filter" manufactured by Fujifilm Corporation) was placed on the display device. The surface light source device was turned on. The above-mentioned luminance meter was aimed at the first region of the display system, and the luminance was measured. The measurement angle of the luminance meter was 45°. The distance between the first region of the display system and the luminance meter was 30 cm. The amount of light from the display device was adjusted by the light-adjusting filter so that the ratio of the luminance measured in the first region of the display system to the luminance measured at the center of gravity of the standard white board was 45,000:1,000.

[0353] The illumination unit of the lens device was turned on, and the display surface of the display system was illuminated by one-sided illumination. In this state, a grayscale image of the display surface of the display system was obtained using an imaging device. The obtained grayscale images were observed by 10 observers, and the image quality was evaluated based on the following evaluation criteria. The evaluation results for Evaluation 3 are shown in the "Evaluation 3" column of Tables 6 to 8.

[0354] <Evaluation Criteria for Evaluation 3> AA: None of the observers recognized any hard-to-see parts in the character string "ECO". A: The number of observers who recognized any hard-to-see parts in the character string "ECO" was between 1 and 4. B: The number of observers who recognized any hard-to-see parts in the character string "ECO" was 5. C: The number of observers who recognized any hard-to-see parts in the character string "ECO" was 6 or more.

[0355] <Evaluation 4> In the display systems according to Examples 29 to 32, the light-emitting devices were turned on. The light-emitting devices in the turned-on state displayed the character string "ECO" in the center of the light-emitting surface. The font for the character string "ECO" was Arial in bold. The size of the character string "ECO" was 40 pt. The color of the character string "ECO" was black. The light-emitting surface was white except for the part displaying the character string "ECO". The display systems including the light-emitting devices in the turned-on state were observed by 10 observers, and the visibility of the image was evaluated based on the following evaluation criteria. The evaluation results for Evaluation 4 are shown in the "Evaluation 4" column of Table 9.

[0356] <Evaluation criteria for evaluation 4> AA: Eight or more observers were able to observe the character string "ECO". A: Six to seven observers were able to observe the character string "ECO". B: Five observers were able to observe the character string "ECO". C: Four or fewer observers were able to observe the character string "ECO".

[0357]

[0358]

[0359]

[0360]

[0361]

[0362]

[0363]

Claims

1. A decorative sheet including a first surface and a second surface, comprising a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative sheet has a value of 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

2. The design includes a pattern, and the L is measured by the SCI method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ The decorative sheet according to claim 1 , wherein the difference between the maximum and minimum values of ten measured values is 0.4 or more and 11.0 or less.

3. L measured by the SCI method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ 2. The decorative sheet according to claim 1, wherein a difference between the maximum and minimum values of 10 measured values for the total light transmittance is 0.1 or more and 9.0 or less, and a difference between the maximum and minimum values of 25 measured values for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

4. A decorative sheet including a first surface and a second surface, comprising a design layer having a design observable from the first surface, L ＊ a ＊ b ＊ L in color system ＊ The decorative sheet has a value of 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

5. The design includes a pattern, and the L is measured by the SCE method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ The decorative sheet according to claim 4 , wherein the difference between the maximum and minimum values of ten measured values is 0.5 or more and 11.0 or less.

6. L measured by the SCE method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ 5. The decorative sheet according to claim 4, wherein a difference between the maximum and minimum values of 10 measured values for the total light transmittance is 0.1 or more and 9.0 or less, and a difference between the maximum and minimum values of 25 measured values for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

7. The total light transmittance [%] of the L measured by the SCI method using reflected light with the first surface as the incident surface. ＊ a ＊ b ＊ L in color system ＊ The decorative sheet according to claim 1 or 4, wherein the ratio of the values is 0.5 or more and 1.5 or less.

8. The L measured by the SCE method using reflected light with the first surface as the incident surface, relative to the total light transmittance [%] ＊ a ＊ b ＊ L in color system ＊ The decorative sheet according to claim 1 or 4, wherein the ratio of the values is 0.1 or more and 1.0 or less.

9. A decorative sheet according to claim 1 or 4, wherein the area ratio of the high-brightness reflective regions is 35% or less, and the high-brightness reflective regions are regions having pixel values ranging from 129 to 255 in a 256-level grayscale image obtained by capturing an image of the first surface while irradiating the first surface with light at an incident angle of 21.75°.

10. The decorative sheet according to claim 1 or 4, wherein the decorative sheet is overlaid on a display device including a light-emitting device and a pattern mask from the second surface, the pattern mask including an opening region through which light emitted from the light-emitting device can pass, the area of the high-brightness display region when a first light is irradiated onto the first surface and a second light is irradiated onto the second surface is between 0.5 and 2.5 times the area of the opening region, the first light is light that is incident on the first surface at an incident angle of 21.75°, and the second light is light emitted from the display device, and the high-brightness display region is a region having a pixel value between 129 and 255 in a 256-level grayscale image captured of the first surface when the first light is irradiated onto the first surface and the second light is irradiated onto the second surface.

11. A decorative sheet according to claim 1 or 4, comprising a pattern mask layer that forms the second surface and has visible light blocking properties, and that includes recesses that open into the second surface.

12. The decorative sheet according to claim 1 or 4, having a total light transmittance of 8% or more and 50% or less.

13. A decorative sheet according to claim 1 or 4, wherein the design includes a pattern, and in a 256-level grayscale image of the first surface captured with light irradiated onto the first surface at an incident angle of 21.75°, the variation in pixel values is between 15 and 65.

14. A decorative sheet according to claim 1 or 4, comprising a plurality of non-decorative portions that do not form a design, the plurality of non-decorative portions being regularly arranged two-dimensionally in a plan view.

15. A decorative sheet as described in claim 1 or 4, which, in a plan view, includes a first portion in which non-decorative portions that do not form a design are regularly arranged two-dimensionally, and a second portion that does not include the non-decorative portions.

16. A decorative member comprising: a decorative sheet according to any one of claims 1 to 15; and a thermoplastic resin part superimposed on the second surface of the decorative sheet.

17. A decorative sheet and a thermoplastic resin part superimposed on the decorative sheet are provided in this order from the first surface to the second surface, and the decorative sheet includes a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative member has a value of 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the first surface as the incident surface.

18. The design includes a pattern, and the L is measured by the SCI method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ 18. The decorative member according to claim 17, wherein the difference between the maximum and minimum values of ten measured values is 0.4 or more and 11.0 or less.

19. L measured by the SCI method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ 18. The decorative member according to claim 17, wherein a difference between the maximum and minimum values of 10 measured values for the total light transmittance is 0.1 or more and 9.0 or less, and a difference between the maximum and minimum values of 25 measured values for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

20. A decorative sheet and a thermoplastic resin part superimposed on the decorative sheet are provided in this order from the first surface to the second surface, and the decorative sheet includes a design layer having a design observable from the first surface, ＊ a ＊ b ＊ L in color system ＊ The decorative member has a value of 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the first surface as the incident surface.

21. The design includes a pattern, and the L is measured by the SCE method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ 21. The decorative member according to claim 20, wherein the difference between the maximum and minimum values of ten measured values is 0.5 or more and 11.0 or less.

22. L measured by the SCE method at 10 different points on the first surface using reflected light with the first surface as the incident surface. ＊ 21. The decorative member according to claim 20, wherein a difference between the maximum and minimum values of 10 measured values for the total light transmittance is 0.1 or more and 9.0 or less, and a difference between the maximum and minimum values of 25 measured values for the total light transmittance measured at 25 different locations is 1% or more and 30% or less of the average value of the 25 measured values.

23. A decorative member according to claim 17 or 20, having a total light transmittance of 7% or more and 50% or less.

24. A decorative member according to claim 17 or 20, wherein the decorative sheet includes a plurality of non-decorative portions that do not form a design, and the plurality of non-decorative portions are regularly arranged two-dimensionally in a plan view.

25. A decorative member as described in claim 17 or 20, which, in a plan view, comprises a first portion in which non-decorative portions that do not form a design are regularly arranged two-dimensionally, and a second portion in which the decorative sheet does not include the non-decorative portions.

26. A display system comprising: a light-emitting device; and a decorative sheet according to any one of claims 1 to 15, which is superimposed on the light-emitting surface of the light-emitting device from the second surface side.

27. A decorative sheet according to claim 1, which is provided with a light-emitting device and is placed on the light-emitting surface of the light-emitting device from the second surface side, ＊ a ＊ b ＊ L in color system ＊ The display system has a value of 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the light-emitting surface as the incident surface.

28. A decorative sheet according to claim 3, which is provided on a light-emitting surface of the light-emitting device from the second surface side, ＊ a ＊ b ＊ L in color system ＊ The display system has a value of 0.2 or more and 25.0 or less when measured by the SCE method using reflected light with the light-emitting surface as the incident surface.

29. A display device comprising: a light-emitting device; and a decorative sheet that is overlaid on a light-emitting surface of the light-emitting device and forms a display surface, the decorative sheet having a design layer that has a design that can be observed from the display surface; ＊ a ＊ b ＊ L in color system ＊ The value is 25.0 or more and 45.0 or less when measured by the SCI method using reflected light with the display surface as the incident surface.

30. A display device comprising: a light-emitting device; and a decorative sheet that is overlaid on a light-emitting surface of the light-emitting device and forms a display surface, the decorative sheet having a design layer that has a design that can be observed from the display surface; ＊ a ＊ b ＊ L in color system ＊ The display system has a value of 6.0 or more and 29.5 or less when measured by the SCE method using reflected light with the display surface as the incident surface.

31. The display system of claim 27 or 28, further comprising a pattern mask disposed between the light-emitting device and the decorative sheet, the pattern mask having an opening region through which light can pass, the decorative sheet being overlaid on the light-emitting device from the second surface, the area of the high-brightness display region when the first light is irradiated onto the first surface and the second light is irradiated onto the second surface is between 0.5 and 2.5 times the area of the opening region, the first light is light that is incident on the first surface at an incident angle of 21.75°, and the second light is light that is emitted from the light-emitting device and passes through the opening region, and the high-brightness display region is a region having a pixel value between 129 and 255 in a 256-level grayscale image captured of the first surface when the first light is irradiated onto the first surface and the second light is irradiated onto the second surface.

Images