Decorative sheet and display system

Abstract

To achieve improvement in the visibility of an image within a display system.SOLUTION: 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 in the L*a*b* color system is 25.0 or more and 45.0 or less in a measurement by the SCI method using reflected light with the first surface 20a as the incident surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] As disclosed in Patent Document 1, 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 040195 Summary of the Invention [Problem to be solved by the invention]

[0004] In a display system illuminated by external light, the visibility of an image deteriorates. The inventors of the present invention have confirmed that the visibility of an image deteriorates depending on the type of design expressed by the decorative sheet. The present disclosure aims to improve the visibility of an image in a display system. [Means for solving the problem]

[0005] A first decorative sheet according to an embodiment of the present disclosure includes: A decorative sheet including a first surface and a second surface, a design layer having a design observable from the first surface; L * a * b * L in color space * 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] The second decorative sheet according to an embodiment of the present disclosure includes: A decorative sheet including a first surface and a second surface, a design layer having a design observable from the first surface; L * a * b * L in color space * 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. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to improve the visibility of images in a display system. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an exploded perspective view of a display system for explaining an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the display system of FIG. [Figure 3] FIG. 3 is a plan view of a pattern mask included in the display system of FIG. [Figure 4] FIG. 4 is a plan view of the display system of FIG. 1 in a display state. [Figure 5] FIG. 5 is an enlarged plan view of the decorative sheet included in the display system of FIG. 1, as viewed from the first surface. [Figure 6] FIG. 6 is an enlarged view of the display system of FIG. [Figure 7] FIG. 7 is a diagram for explaining a method for identifying the area of a high-brightness reflective region. [Figure 8] FIG. 8 is a diagram illustrating the lens device. [Figure 9] FIG. 9 is a diagram for explaining the measurement conditions for the high-brightness reflective area. [Figure 10] FIG. 10 is a diagram for explaining a method for specifying the area of a high-brightness display region. [Figure 11] FIG. 11 is a diagram showing an example of a high-brightness display area. [Figure 12] FIG. 12 is a cross-sectional view of a modified example of the decorative sheet. [Figure 13] FIG. 13 is a cross-sectional view of another modified example of the decorative sheet. [Figure 14] FIG. 14 is a perspective view of a modified example of the display system. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present disclosure relates to the following [1] to

[11] .

[0010] [1] A decorative sheet including a first surface and a second surface, a design layer having a design observable from the first surface; L * a * b * L in color space * 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.

[0011] [2] A decorative sheet including a first surface and a second surface, a design layer having a design observable from the first surface; L * a * b * L in color space * 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.

[0012] [3] The total light transmittance [%] is measured by the SCI method using reflected light from the first surface as the incident surface. * a * b * L in color space * The decorative sheet of [1] or [2], wherein the ratio of the values is 1.5 or less.

[0013] [4] 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 space * The decorative sheet according to any one of [1] to [3], in which the ratio of the values is 1.0 or less.

[0014] [5] A decorative sheet according to any one of [1] to [4], in which the area ratio of high brightness reflective regions is 35% or less.

[0015] [6] The decorative sheet is placed on the second surface of a display device including a light-emitting device and a pattern mask, the pattern mask includes an opening region through which light emitted from the light emitting device can pass; an area of the high-brightness display region in a state in which the first light is irradiated onto the first surface and the 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°; The decorative sheet according to any one of [1] to [5], wherein the second light is the light emitted from the display device.

[0016] [7] A pattern mask layer is provided which forms the second surface and has a visible light blocking property, The decorative sheet according to any one of [1] to [6], which includes a recessed portion that opens on the second surface.

[0017] [8] The decorative sheet according to any one of [1] to [7], which has a total light transmittance of 10% or more and 50% or less.

[0018] [9] A decorative sheet according to any one of [1] to [8]. a thermoplastic resin portion overlaid on the decorative sheet.

[0019]

[10] a light-emitting device; A display system comprising: a decorative sheet according to any one of [1] to [8] or a decorative member according to [9], overlaid on the light-emitting device.

[0020]

[11] A pattern mask is disposed between the light-emitting device and the decorative sheet and has an opening region through which light can pass, the decorative sheet is placed on the light emitting device from the second surface, an area of the high-brightness display region in a state in which the first light is irradiated onto the first surface and the 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°; The display system of

[10] , wherein the second light is light emitted from the light-emitting device and passed through the opening area.

[0021] 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.

[0022] 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.

[0023] Directions common to the drawings are indicated by arrows with the same symbol 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 Figure 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 Figure 3, for example.

[0024] When multiple upper limit candidates and multiple lower limit candidates are listed for a certain parameter, the numerical range of the parameter may be constructed by combining any one upper limit candidate with any one lower limit candidate. For example, it may be written as follows: "Parameter C may be B1 or more, B2 or more, or B3 or more. Parameter B may be B4 or less, B5 or less, or B6 or less." In this example, the numerical range of parameter B may be B1 or more and B4 or less, B1 or more and B5 or less, B1 or more and B6 or less, B2 or more and B4 or less, B2 or more and B5 or less, B2 or more and B6 or less, B3 or more and B4 or less, B3 or more and B5 or less, or B3 or more and B6 or less.

[0025] 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. The light-emitting device 10 and the pattern mask 15 may form a display device 16.

[0026] 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.

[0027] 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 unlit 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.

[0028] 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.

[0029] The light emitting device 10 can be in a light-on state or a light-off 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 emitter such as a cold cathode fluorescent lamp or a light emitting diode (LED). The light emitting device 10 may also include a surface light source device that emits light in a planar form.

[0030] 1 functions as a surface light source device and is capable of emitting light in a plane perpendicular to a first direction D1 when turned on. In other words, the illustrated light emitting device 10 has a light emitting surface 11 that extends 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.

[0031] 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 length 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-shielding region 152.

[0032] The pattern mask 15 allows light from the light-emitting device 10 emitted from the light-emitting surface 11 to pass through 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 three letters, "E," "C," and "O." That is, 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.

[0033] The pattern mask 15 has a visible light blocking property in the light-blocking region 152. In the display device 16 shown in FIG. 2, light of the light-emitting device 10 emitted from 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 an aluminum pigment, for example. The light-blocking region 152 may be formed by printing.

[0034] "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 incident angle when measuring the visible light transmittance is taken as 0°. The incident angle 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°.

[0035] 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 the 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 the start of the test. Other measurement conditions for measuring total luminous transmittance follow JIS K 7361-1:1997. Note that "total luminous transmittance" is a percentage value in the unit %.

[0036] 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.

[0037] In the display system 1 shown in FIGS. 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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. 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 10% or more, or 20% or more. The total light transmittance of the decorative sheet 20 is measured by the method described above.

[0043] 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.

[0044] The decorative sheet 20 may transmit visible light in the non-decorative portion 22 to an extent that it 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.

[0045] When the decorative sheet 20 or a component of the decorative sheet 20 is "transparent," the visible light transmittance of the decorative sheet 20 or that component is 50% or more. When the decorative sheet 20 or a certain component of the decorative sheet 20 is "transparent," the visible light transmittance of the decorative sheet 20 or that component may be 80% or more, or even 90% or more. The visible light transmittance of the decorative sheet 20 or that component is measured by the method described above.

[0046] In the decorative sheet 20 shown in FIG. 6, the non-decorative portions 22 are regularly two-dimensionally arranged in the second direction D2 and the third direction D3. The illustrated non-decorative portions 22 are arranged in a lattice array 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 also have a polygonal shape. Unlike the illustrated example, the regularly arranged non-decorative portions 22 may be connected to each other. The non-decorative portions 22 do not have to be arranged two-dimensionally. The non-decorative portions 22 may also be arranged between linearly extending decorative portions 21.

[0047] 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.

[0048] 6 are stacked in a first direction D1. In the illustrated decorative sheet 20, the first direction D1 is the stacking direction of the layers of the decorative sheet 20.

[0049] 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.

[0050] 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.

[0051] The base layer 23 shown in FIG. 6 is a sheet extending in the second direction D2 and the third direction D3. The base layer 23 is capable of transmitting light emitted from the display device 16. The base layer 23 may be a resin sheet. The base layer 23 may contain a thermoplastic resin as a material. The thermoplastic resin contained in the base layer 23 may include one or more of acrylic, PET (polyethylene terephthalate), polyolefin resin such as polypropylene or polyethylene, polycarbonate, and ABS (acrylonitrile-butadiene-styrene copolymer synthetic resin).

[0052] 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.

[0053] 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 contain a binder resin and light-absorbing particles dispersed in the binder resin. The light-absorbing particles may contain a black pigment such as carbon black or titanium black. The light-shielding layer 24 may contain an optical interference pigment instead of the light-absorbing particles. The optical interference pigment may be, for example, an aluminum pigment.

[0054] 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.

[0055] 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.

[0056] The design layer 25 has a design D. The design D may include a pattern. The pattern may include a wood grain or marble design. The pattern may include a geometric design formed by a pattern. The design D may include one or more of figures, designs, colors, pictures, photographs, characters, marks, pictograms, letters, numbers, and other images.

[0057] The design layer 25 may include a binder resin and a color material dispersed in the binder resin. The color material may be a dye, a pigment, or a combination of a dye and a pigment.

[0058] 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.

[0059] 6, the decorative sheet 20 may have an uneven surface 30. The uneven surface 30 shown in the figure includes a plurality of protrusions 31 aligned in the second direction D2. The protrusions 31 shown in the figure are located in the decorative portion 21. The protrusions 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 protrusions 31.

[0060] 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 decorative sheet 20 shown in the figure, 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In the decorative sheet 20 shown in FIG. 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. The surface layer 27 may contain a thermoplastic resin as its material. The thermoplastic resin contained in the surface layer 27 may include one or more of acrylic, PET (polyethylene terephthalate), polyolefin resin such as polypropylene or polyethylene, polycarbonate, ABS (acrylonitrile-butadiene-styrene copolymer synthetic resin), polyvinyl chloride (PVC), polyvinylidene chloride (PVDF), polyetherimide (PEI), and polyimide (PI). 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.

[0065] 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.

[0066] An example of a method for manufacturing the decorative sheet 20 shown in FIG. 6 will be described.

[0067] 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.

[0068] 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.

[0069] 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 where the non-decorative portion 22 will be formed. 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.

[0070] An adhesive layer 26 is overlaid on a laminate including a base material layer 23, a light-shielding layer 24, and a design layer 25. The adhesive layer 26 is overlaid on the uneven surface 30 of the laminate. The laminate including the base material layer 23, the light-shielding layer 24, the design layer 25, and the adhesive 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 adhesive layer 26.

[0071] 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.

[0072] The operation of the illustrated display system 1 will now be described.

[0073] When the light emitting device 10 is lit, it emits light from its light emitting surface 11. The light emitted from the light emitting surface 11 travels toward the pattern mask 15. The light emitted from the light emitting device 10 and reaching the transmissive region 151 passes through the pattern mask 15. The 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 that has passed through the pattern mask 15 travels toward the decorative sheet 20.

[0074] 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.

[0075] 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.

[0076] In an off state, the light-emitting device 10 stops emitting light from the light-emitting surface 11. In a display system 1 including the light-emitting device 10 in an off state, design D is displayed in both the first area A1 and the second area A2. Design D can conceal the display device 16. Design D allows the display system 1 to be installed while ensuring harmony and uniformity with the surrounding environment.

[0077] 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 images.

[0078] The design of the decorative sheet can affect the visibility of the image in the display system. * a * b * L in color space * 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.

[0079] In the decorative sheet 20 shown in FIGS. * a * b * L in color space * 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."

[0080] Decorative sheet 20L * a * b * L in color space * The value may be measured by the SCI method. In the measurement by the SCI method, the L * 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 equal to or greater than 25.0. The "SCI method" is a measurement method that includes the component of light reflected by the decorative sheet 20 as a specular reflection.

[0081] Decorative sheet 20L * a * b * L in color space * 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 value. *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 specular reflection is excluded from the measurement target.

[0082] Decorative sheet 20L * The L value of the decorative sheet 20 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 values 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 D65 light source. * In measuring the L value, the measurement diameter of the spectrophotometer is 6 mm. * When measuring the values, the illumination diameter of the spectrophotometer is 11 mm.

[0083] Decorative sheet 20L * 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.

[0084] Decorative sheet 20L * The value may be adjusted by adjusting the color material contained in 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, the L * Depending on the value, a pattern included in design D may be selected.

[0085] In addition, L measured by reflected light with the first surface 20a as the incident surface * 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.

[0086] In the decorative sheet 20, the ratio of the total light transmittance to the total light transmittance measured by the SCI method using reflected light with the first surface 20a as the incident surface is * The ratio of the values may be 1.5 or less, 1.3 or less, 1.1 or less, or 0.9 or less. In the decorative sheet 20, the ratio of the L measured by the SCI 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 0.5 or more, 0.6 or more, 0.7 or more, or 0.8 or more.

[0087] 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 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.

[0088] 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.

[0089] The "proportion of the area of the high brightness reflective regions HL" in the decorative sheet 20 is determined using a grayscale image of the first surface 20a of the decorative sheet 20 captured indoors, as will be described below.

[0090] 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.

[0091] 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 by one-sided illumination. As shown in FIG. 8 , during one-sided illumination, a portion of the illumination unit 92 that is 1 / 4 of the circumference is lit, and a portion of the illumination unit 92 that is 3 / 4 of the circumference is unlit. In the circumferential illumination unit 92 shown in FIG. 8 , a first portion 92a that is 1 / 4 of the 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 3 / 4 of the circumference.

[0092] 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 shall be 30 cm.

[0093] 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 10000 cd / m for 1 minute. 2 ~30,000 cd / m 2 Make sure it is located in the range.

[0094] 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.

[0095] 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

[0096] 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 higher the pixel value of a pixel in the grayscale image of the first surface 20a, the brighter the color of that pixel. Therefore, the higher the brightness of a portion of the first surface 20a, the higher 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.

[0097] 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 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.

[0098] 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 parts in Fig. 9 indicate the high-brightness reflective region HL. That is, the pixels corresponding to the white parts in Fig. 9 have pixel values ranging from 129 to 255. The pixels corresponding to the black parts in Fig. 11 have pixel values ranging from 0 to 128.

[0099] 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.

[0100] 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. 10. The first light L1 is light that simulates external light irradiated onto the display system 1. As shown in FIG. 10, 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.

[0101] 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. A camera device capable of generating a captured image using this lens device is used as the camera device. The lens device includes the objective lens 91 and an illumination unit 92 described above. The illumination unit 92 irradiates the first surface 20a of the decorative sheet 20 with a first light L1.

[0102] Prior to capturing an image of the decorative sheet 20, the luminance in the imaging environment illuminated 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.

[0103] 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 10000 cd / m for 1 minute. 2 ~30,000 cd / m 2 Make sure it is located in the range.

[0104] An imaging device is used to image the first surface 20a. 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. 10, 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.

[0105] In the display system 1, as shown in FIG. 10, a light control 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 control 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.

[0106] 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. 10 , 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 dimming filter F. The amount of the first light L2 is adjusted in a state where 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.

[0107] The above-mentioned ratio (45000:1000) 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 is streaming 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 is streaming in during the day.

[0108] 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 an area of 9.5 μm. 2 It has an area of

[0109] 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 higher the pixel value of a pixel in the grayscale image of the first surface 20a, the brighter the color of that pixel. Therefore, the higher the brightness of a portion of the first surface 20a, the higher 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.

[0110] 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.

[0111] FIG. 11 is an image showing an example of the high-brightness display region HI of the decorative sheet 20. FIG. 11 is an image obtained by binarizing the grayscale image of the first surface 20a. The white portions in FIG. 11 indicate the high-brightness display region HI. That is, the pixels corresponding to the white portions in FIG. 11 have pixel values ranging from 129 to 255. The pixels corresponding to the black portions in FIG. 11 have pixel values ranging from 0 to 128.

[0112] 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, when the first light L1 and the second light L2 are irradiated onto the decorative sheet 20, the expansion of the high-brightness display region HI is suppressed. In other words, in the illustrated display system 1, when a state in which an image IM is displayed indoors with daytime external light streaming in is reproduced, the expansion of the high-brightness display region HI is suppressed. Therefore, even when daytime external light streams into the display system 1, the display system 1 can clearly display the image IM.

[0113] 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 space * 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.

[0114] 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 space *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.

[0115] According to this embodiment, it is possible to suppress an increase in brightness due to reflected light with the first surface 20a 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.

[0116] 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.

[0117] 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.

[0118] The decorative sheet 20 described above includes a light-shielding layer 24 that blocks visible light. 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. 12, the light-shielding layer 24 may be omitted from the decorative sheet 20. As shown in Fig. 12, the design layer 25 may be disposed in the decorative portion 21, and the light-shielding layer 24 may not be disposed.

[0119] 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.

[0120] 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.

[0121] The second surface 20b of the decorative sheet 20 shown in FIG. 12 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 contain a binder resin and light-absorbing particles dispersed in the binder resin. The light-absorbing particles may contain a black pigment such as carbon black or titanium black. The pattern mask layer 28 may contain an optical interference pigment instead of the light-absorbing particles. The optical interference pigment may be, for example, an aluminum pigment.

[0122] The decorative sheet 20 shown in Fig. 12 includes recesses 20r that open to the second surface 20b. In particular, the recesses 20r shown in the figure penetrate the pattern mask layer 28. The recesses 20r shown in the figure do not penetrate the design layer 25. As described above, the decorative sheet 20 shown in Fig. 12 does not include the light-shielding layer 24. As a result, the decorative sheet 20 shown in the figure transmits visible light to an extent that the recesses 20r can be distinguished from portions other than the recesses 20r.

[0123] The display system 1 may be configured by overlaying the decorative sheet 20 shown in Fig. 12 on the light emitting device 10. 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 overlapping 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 overlapping with the portion other than the recesses 20r becomes a second area A2.

[0124] 12 shows a decorative sheet 20 that does not include a light-shielding layer 24 but includes a patterned mask layer 28, but the decorative sheet 20 may include both the light-shielding layer 24 and the patterned mask layer 28, as shown in FIG. 13. In other words, even in a decorative sheet 20 that includes a patterned 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.

[0125] 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.

[0126] 14, 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 part 41 bonded to the decorative sheet 20. The first surface 20a of the decorative sheet 20 forms the outer surface of the decorative member 40.

[0127] 14, the thermoplastic resin part 41 includes a portion located between the light emitting device 10 and the decorative sheet 20. The thermoplastic resin part 41 is capable of transmitting light emitted from the light emitting device 10. The thermoplastic resin part 41 may be produced by welding an injected resin to the decorative sheet 20. The thermoplastic resin part 41 may also be produced by solidifying an injected resin injected into a cavity formed in an injection molding machine.

[0128] The decorative member 40 may have a three-dimensional shape as shown in Fig. 14. The decorative member 40 shown in the figure 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.

[0129] The decoration member 40 may be movable relative to the light emitting device 10. The decoration member 40 shown in Fig. 14 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. [Example]

[0130] 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.

[0131] Decorative sheets according to Examples 1 to 15 and Comparative Examples 1 to 3 were produced. Each decorative sheet was produced by the method described above. The produced decorative sheets had a first surface and a second surface opposite to the first surface. The produced decorative sheets had a decorative portion forming a design and a non-decorative portion not forming a design. In the non-decorative portion of the produced decorative sheets, from the second surface to the first surface, a base layer, a bonding layer, and a surface layer were formed in this order. In the decorative portion of the produced decorative sheets, from the second surface to the first surface, a base layer, a light-shielding layer, a design layer, a bonding layer, and a surface layer were formed in this order.

[0132] Example 1 A 125 μm-thick film ("SD015NAH" manufactured by Kaneka Corporation) was used as the base layer. A coating film was formed by applying a resin composition to one side of the base 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 pigments and photoluminescent pigments). The ink was dried to obtain a design layer. 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 in the non-decorative areas. The non-decorative areas were arranged in a two-dimensional pattern. Each non-decorative area had a circular shape with a diameter of 60 μm.

[0133] 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, design layer, and 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, a decorative sheet according to Example 1 was obtained.

[0134] <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.

[0135] 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.

[0136] 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.

[0137] <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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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-decorated portion formed by laser etching. In the decorative sheet according to Example 10, the non-decorated portion had a diameter of 93 μm.

[0143] <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 the 10th geometric pattern as the design.

[0144] <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-decorated portion formed by laser etching. In the decorative sheet according to Comparative Example 2, the non-decorated portion had a diameter of 64 μm.

[0145] <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-decorated portion formed by laser etching. In the decorative sheet according to Comparative Example 3, the non-decorated portion had a diameter of 54 μm.

[0146] The measurement results, calculation results and evaluation results of the decorative sheets according to Examples 1 to 6 are shown in Table 1. The measurement results, calculation results and evaluation results of the decorative sheets according to Examples 7 to 12 are shown in Table 2. The measurement results, calculation results and evaluation results of the decorative sheets according to Examples 13 to 15 and the decorative sheets according to Comparative Examples 1 to 3 are shown in Table 3.

[0147] <Total light transmittance> For each example and each comparative example, the total light transmittance was measured. For the measurement of the total light transmittance, a haze meter (HM-150N) manufactured by Murakami Color Technology Laboratory, Ltd., conforming to JIS K 7361-1:1997 was used. The measurement results are shown in the column of "Total light transmittance [%]" in Tables 1 to 3 below.

[0148] <L value by SCI method> * <value> For each example and each comparative example, the L value in the L*a*b* color system of the reflected light with the first surface as the incident surface was measured by the SCI method. The L value was measured by the method described above using a spectrophotometer (CM-700d manufactured by Konica Minolta Co., Ltd.) conforming to JIS Z 8722:2009. The measurement results are shown in the columns of "SCI L value" in Tables 1 to 3 below. * a * b * L value in the L*a*b* color system * value was measured by the SCI method. The L value was measured by the method described above using a spectrophotometer (CM-700d manufactured by Konica Minolta Co., Ltd.) conforming to JIS Z 8722:2009. The measurement results are shown in the columns of "SCI L value" in Tables 1 to 3 below. * value. *

[0149] <L value by the SCE method> * value> For each example and each comparative example, the L value in the L*a*b* color system of the reflected light with the first surface as the incident surface was measured by the SCE method. The L value was measured by the method described above using a spectrophotometer (CM-700d manufactured by Konica Minolta Co., Ltd.) conforming to JIS Z 8722:2009. The measurement results are shown in the columns of "SCE L value" in Tables 1 to 3 below. * a * b * L value in the L*a*b* color system * value was measured by the SCE method. The L value was measured by the method described above using a spectrophotometer (CM-700d manufactured by Konica Minolta Co., Ltd.) conforming to JIS Z 8722:2009. The measurement results are shown in the columns of "SCE L value" in Tables 1 to 3 below. * value. *

[0150] <Ratio of the L value by the SCI method to the total light transmittance> * value ratio> For each example and each comparative example, the ratio of the above-mentioned L value measured by the SCI method to the measured total light transmittance was calculated. The calculation results are shown in the columns of "SCI / Transmittance" in Tables 1 to 3 below. *

[0151] <Ratio of the L value by the SCE method to the total light transmittance> * value ratio> For each example and each comparative example, the ratio of the above-mentioned L value measured by the SCE method to the measured total light transmittance was calculated. The calculation results are shown in the columns of "SCE / Transmittance" in Tables 1 to 3 below. *

[0152] <High-brightness reflection region> ​​​​The proportion of high-brightness reflective area was calculated for each example and comparative example by the method described above. The calculation results are shown in the "high-brightness reflective area" column in Tables 1 to 3 below.

[0153] <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 letter "E" was 2,600,000 μm. 2 The area of the opening corresponding to the letter "C" is 3,000,000 μm 2 The area of the opening 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.

[0154] 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°. In this state, a luminance meter (Konica Minolta CS-100A) was aimed at the center of gravity of the standard white board, and the luminance was measured. The measured luminance was 10,000 cd / m for 1 minute. 2 ~30,000 cd / m 2 It was confirmed that the luminance meter was positioned within the range of 45°. 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.

[0155] The decorative sheets according to each example and comparative example were overlaid on a display device. A display system including the decorative sheets according to each example and comparative example was formed. 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.

[0156] 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 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.

[0157] In a display system including each example and each comparative example, the lighting unit of the lens device was turned on, and the display surface of the display system was illuminated by one-sided lighting. A first light was irradiated from the lighting unit onto a 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 a second surface of the decorative sheet. In this state, the opening region was imaged, and a grayscale image of the display surface was obtained. 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 in Tables 1 to 3.

[0158] <Evaluation> 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 are shown in the "Evaluation" column of Tables 1 to 3. <Evaluation criteria> AA: More than eight observers were able to see the string "ECO." A: The number of observers who were able to observe the string "ECO" was between 6 and 7. B: Five observers were able to observe the string "ECO." C: Fewer than four observers were able to observe the string "ECO."

[0159] [Table 1]

[0160] [Table 2]

[0161] [Table 3] [Explanation of symbols]

[0162] 1: display system, 1a: display surface, 10: light-emitting device, 11: light-emitting surface, 15: pattern mask, 15X: opening area, 16: display device, 20: decorative sheet, 20a: first surface, 20b: second surface, 20r: recess, 25: design layer, 28: pattern mask layer, 40: decorative member, D: design, IM: image, L1: first light, L2: second light

Claims

1. A decorative sheet including a first surface and a second surface, 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 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. A decorative sheet including a first surface and a second surface, 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.

3. 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 claim 1 or 2, wherein the ratio of the values is 1.5 or less.

4. 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 2, wherein the ratio of the values is 1.0 or less.

5. 3. The decorative sheet according to claim 1, wherein the ratio of the area of the high-brightness reflective region to the total area is 35% or less.

6. the decorative sheet is placed on the second surface of the display device including the light-emitting device and the pattern mask; the pattern mask includes an opening region through which light emitted from the light emitting device can pass; an area of the high-brightness display region in a state in which the first light is irradiated onto the first surface and the 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°; The decorative sheet according to claim 1 , wherein the second light is the light emitted from the display device.

7. a pattern mask layer that forms the second surface and has a visible light blocking property; The decorative sheet according to claim 1 , further comprising a recess that opens onto the second surface.

8. The decorative sheet according to claim 1 or 2, which has a total light transmittance of 10% or more and 50% or less.

9. The decorative sheet according to claim 1 or 2; a thermoplastic resin portion overlaid on the decorative sheet.

10. a light-emitting device; A display system comprising: the decorative sheet according to claim 1 or 2 superimposed on the light-emitting device.

11. a pattern mask disposed between the light-emitting device and the decorative sheet and having an opening region through which light can pass; the decorative sheet is placed on the light-emitting device from the second surface, an area of the high-brightness display region in a state in which the first light is irradiated onto the first surface and the 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°; The display system of claim 10 , wherein the second light is light emitted from the light-emitting device and passed through the aperture region.

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