Decorative sheet and display system

Abstract

To improve the visibility of images on a display system. 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 observable 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.

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. When the inventors of the present invention confirmed that the visibility of an image deteriorated depending on the type of design expressed by the decorative sheet, the object of the present disclosure is to improve the visibility of an image in a display system. [Means for solving the problem]

[0005] The 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. Effect of the Invention

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

[0008] [Figure 1] FIG. 1 is an exploded perspective view of a display system for explaining an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of the display system of FIG. [Diagram 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. [Diagram 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 for explaining 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 PREFERRED EMBODIMENTS

[0009] One 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 value of this decorative sheet 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.

[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 value of this decorative sheet 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.

[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 value ratio 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, as a percentage of the total light transmittance [%] * a * b * L in color space * A decorative sheet according to any one of [1] to [3], in which the value ratio is 1.0 or less.

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

[0015] [6] The decorative sheet is superimposed 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 ​​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 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 that 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 recess that opens onto the second surface.

[0017] [8] A decorative sheet according to any one of [1] to [7], having 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 decorative member comprising: 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, the pattern mask 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 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 passes through the opening area.

[0021] An embodiment will be described below with reference to the drawings. In the drawings, the scale and aspect ratios are appropriately changed and exaggerated from those of the actual objects for the convenience of illustration and understanding. Note that configurations shown in some drawings may be omitted in other drawings.

[0022] Terms such as "orthogonal" and "same" for specifying shapes and geometric conditions and their degrees, and numerical values ​​such as angles are not limited to their strict meanings. These terms are to be interpreted including a range of degrees within which similar functions can be expected.

[0023] 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 to 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.

[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 of the upper limit candidates and any one of the lower limit candidates. 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 an 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 overlapping the light emitting device 10 in a first direction D1. The illustrated display system 1 also includes a pattern mask 15 located 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] The display system 1 is capable of displaying an image IM and a design D, as shown in Fig. 4. The display system 1 displays the image IM by 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 by 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 in which 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 moving body. The moving body is a movable device or equipment. The moving body may include a vehicle such as an automobile. The moving body 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 include a surface light source device that emits light in a planar form.

[0030] The light emitting device 10 shown in Fig. 1 is capable of emitting light in a plane perpendicular to a first direction D1 as a surface light source device in a lit state. In other words, the light emitting device 10 shown has a light emitting surface 11 that spreads on 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 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 transmission region 151 and a light-shielding region 152.

[0032] The pattern mask 15 is capable of transmitting the light of the light emitting device 10 emitted from the light emitting surface 11 in the transparent region 151. The transparent region 151 has the same shape as the image to be displayed by the display system 1. The transparent region 151 shown in FIG. 3 has the shape of the alphabet "E", "C", or "O". The illustrated transparent region 151 forms a character string with three letters, "E", "C", and "O". That is, the illustrated display system 1 is intended to display the character string "ECO" as an image. The transparent region 151 is not limited to the illustrated example, and may have a shape such as a figure, a mark, or a pictogram depending on the image to be displayed.

[0033] The pattern mask 15 has visible light blocking properties in the light blocking region 152. In the display device 16 shown in FIG. 2, the 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 at 1 nm intervals within a measurement wavelength range of 380 nm to 780 nm using a haze meter conforming to JIS K 7361-1:1997. When the transmission direction is not particularly specified, the incident angle when measuring the visible light transmittance is set to 0°. The incident angle is the angle that the traveling direction of the incident light makes with respect to the normal direction to the incident surface, and is a value less than 90°.

[0035] A D65 light source is used to measure total light transmittance. Prior to measuring total light transmittance, the light source is turned on for 15 minutes. When measuring total light 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 when measuring total light transmittance is a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The object to be measured for total light transmittance is placed in the test environment for 16 hours before starting the test. Other measurement conditions when measuring total light transmittance are in accordance with JIS K 7361-1:1997. Note that "total light 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, the 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 blocking region 152. The light blocking region 152 may be removed by various methods such as laser etching. When the light blocking region 152 is formed by printing, the composition forming the light blocking region 152 may not be printed on the portion forming the opening region 15X. That is, the pattern mask 15 may be formed by pattern printing. The light emitted from the light emitting device 10 can be blocked in the region of the pattern mask 15 other than the opening region 15X. As a result, as shown in FIG. 4, the display system 1 including the light emitting device 10 in the 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 a 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 the second direction D2 and a width direction in the third direction D3.

[0038] The decorative sheet 20 shown in Fig. 2 and Fig. 4 has a first surface 20a and a second surface 20b facing 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 the 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] The decorative sheet 20 shown in Fig. 5 and Fig. 6 includes a decorative portion 21 that forms a design D, and a non-decorated portion 22 that does not form the design D. The illustrated decorative sheet is provided with a plurality of non-decorated portions 22. Note that in the display system 1 shown in Fig. 1 and other figures, the dimensions of each non-decorated 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 portion 21 is displayed on the entire display surface 1a.

[0044] The decorative sheet 20 may transmit visible light in the non-decorated portion 22 to an extent that the non-decorated portion 22 can be distinguished from the decorative portion 21. The decorative sheet 20 may be transparent in the non-decorated portion 22. The decorative sheet 20 may not be transparent in the non-decorated portion 22. The illustrated decorative sheet 20 is capable of transmitting light emitted from the display device 16 in the non-decorated 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 the 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 the component may be 80% or more, or may be 90% or more. The visible light transmittance of the decorative sheet 20 or the component of the decorative sheet 20 is measured by the method described above.

[0046] In the decorative sheet 20 shown in FIG. 6, the non-decorated portions 22 are regularly two-dimensionally arranged in the second direction D2 and the third direction D3. The illustrated non-decorated portions 22 are arranged in a lattice arrangement in the second direction D2 and the third direction D3. The illustrated non-decorated portions 22 have a circular shape when observed from the first direction D1. The shape of the non-decorated portions 22 is not limited to a circular shape. The non-decorated portions 22 may have a polygonal shape. Unlike the illustrated example, the regularly arranged non-decorated portions 22 may be connected to each other. The non-decorated portions 22 do not have to be two-dimensionally arranged. The non-decorated portions 22 may be arranged between the 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-decorated 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-decorated 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 material layer 23 is located on the second most side in the first direction D1. The base material layer 23 forms the second surface 20b of the decorative sheet 20. The base material layer 23 supports the layers of the decorative sheet 20 other than the base material layer 23. The base material layer 23 may be colored. The base material layer 23 may be transparent.

[0050] From the viewpoint of stably supporting other components of the decorative sheet 20, a lower limit may be set for the thickness of the base material layer 23. The thickness of the base material 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 material 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 sheet made of resin. The base layer 23 may contain a thermoplastic resin as a material. The thermoplastic resin contained in the base layer 23 may contain 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 decorated portion 21. The light-shielding layer 24 is not located in the non-decorated 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 the visible light-shielding property, the light-shielding layer 24 can absorb light 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 an aluminum pigment, for example.

[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 decorated portion 21. The design layer 25 is not located in the non-decorated 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 pattern. The pattern may include a geometric pattern formed by a pattern. The design D may include one or more patterns such as figures, designs, colors, pictures, photographs, characters, marks, pictograms, letters, and numbers.

[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 to 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 layer 23 at the second surface 26b.

[0062] The bonding layer 26 shown in Fig. 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 by the 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 a material. The thermoplastic resin contained in the surface layer 27 may contain 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 above-mentioned binder resin and light-absorbing particles may be applied onto 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 the base layer 23, the light-shielding layer 24, and the 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.

[0070] An adhesive layer 26 is overlaid on a laminate including the base material layer 23, the light-shielding layer 24, and the 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 the laminate being pressurized 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] In a lit state, the light emitting device 10 emits light from the 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 blocking region 152 is absorbed in the pattern mask 15. In this way, the pattern mask 15 shapes the light emitted from the light emitting device 10. The light that passes through the pattern mask 15 travels toward the decorative sheet 20.

[0074] The 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, the light that reaches the non-decorated portion 22 passes through the decorative sheet 20. Specifically, the light that has reached the non-decorated portion 22 passes from the second surface 20b through the base 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, the light that has reached the decorative portion 21 is absorbed by the light-shielding layer 24.

[0075] The luminance in the first region A1 of the display system 1 increases due to the light emitted from the display surface 1a. The luminance in the first region A1 becomes greater than the luminance in the second region A2 due to the light emitted from the display surface 1a. As the luminance in the first region A1 becomes greater than the luminance 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, the design D is displayed in both the first area A1 and the second area A2. The display device 16 can be concealed by the design D. The design D allows the display system 1 to be installed while ensuring harmony and uniformity with the surrounding environment.

[0077] Incidentally, a display system including a light-emitting device and a decorative sheet superimposed 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 to a display surface that displays an image and a design. In the display surface, the external light may be irradiated to both a first region that displays an image and a second region other than the first region. The external light irradiated to the display surface may be reflected by the display surface formed by the decorative sheet regardless of the first region and the second region. The external light irradiated to the display surface may be reflected at the interface between the decorative sheet and the light-emitting device regardless of the first region and the second region, and may be emitted again from the display surface. Therefore, the external light increases the luminance on the display surface of the display system regardless of the first region and the second region. As a result, the luminance in the first region and the luminance in the second region both increase, and thus the contrast between the first region and the second region may decrease in the display system illuminated by external light, and the visibility of the image may deteriorate.

[0078] The design of the decorative sheet can affect the visibility of the image in the display system. * a * b * L in color space * The inventors of the present invention have found that when the L value of the decorative sheet is below a predetermined threshold value, 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 having the surface on which the decorative sheet is observed as the incident surface. "Reflected light having the surface on which the decorative sheet is observed as the incident surface" includes light that enters the interior of 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 FIG. 1 to FIG. 6, L * 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 inside 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 L 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 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 the reflected light that is specularly reflected from the decorative sheet 20 in the measurement target.

[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 limit to 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 the reflected light that is a specular reflection from the decorative sheet 20 is excluded from the measurement target.

[0082] Decorative sheet 20L * 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 regular 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 for 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 value, the measurement diameter of the spectrophotometer is 8 mm. L of the decorative sheet 20 * In 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 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. As an 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, the L measured by the reflected light with the first surface 20a as the incident surface is * Instead of the value, L for the total light transmittance * 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 placed on the ratio of values.

[0086] 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 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 * 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 the L * 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 captured indoors of the first surface 20a of the decorative sheet 20, as 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. As the lens device, a VH-Z20R manufactured by Keyence Corporation is used. As the camera device, a camera device capable of generating an image using this lens device is used.

[0091] As shown in Figs. 7 and 8, a lens device 90 including an objective lens 91 facing the stage of the optical microscope and a circumferential illumination unit 92 surrounding the objective lens 91 is used as the lens device. The illumination unit 92 can illuminate the stage by one-sided illumination. As shown in Fig. 8, in the illumination unit 92 during one-sided illumination, a portion having a circumference of 1 / 4 of the entire circumference is turned on, and a portion having a circumference of 3 / 4 of the total length is turned off. In the circumferential illumination unit 92 shown in Fig. 8, a first portion 92a having a circumference of 1 / 4 of the entire circumference is turned on, and a second portion 92b, a third portion 92c, and a fourth portion 92d are turned off. The total circumference of the second portion 92b, the third portion 92c, and the fourth portion 92d is 3 / 4 of the entire 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 the lighting unit. The lighting unit irradiates light onto the standard white plate by the one-way illumination described above. The angle of incidence of the light irradiated onto the standard white plate from the lighting unit is 21.75°. The luminance of the standard white plate in this state is measured by 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 centre of gravity of the standard white board and the luminance meter shall be 30 cm.

[0093] Prior to imaging the decorative sheet 20, the luminance in the imaging environment is stable, i.e., the luminance measured by the above-mentioned method is 10,000 cd / m for one minute. 2 ~30000cd / m 2 Make sure that it is located in the range of

[0094] Next, the first surface 20a is imaged using an imaging device. The imaging device images a portion of the first surface 20a. The portion of the first surface 20a to be imaged 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 a stage 100 of an optical microscope. When the first surface 20a is imaged, the magnification of the objective lens 91 is set to 50 times. As shown in FIG. 7, the decorative sheet 20 is placed on the stage 100 of the optical microscope so that the objective lens 91 and the first surface 20a face each other. 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 light onto the decorative sheet 20 by the one-sided illumination described above. The incident angle θ of the light irradiated from the illumination unit 92 onto the decorative sheet 20 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 between black, gray, and white depending on the pixel value. Each pixel has a pixel value between 0 and 255 depending on the luminance of the portion of the first surface 20a corresponding to the pixel. The higher the pixel value of a pixel in the grayscale image of the first surface 20a, the brighter the color of the pixel. Thus, the higher the luminance 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 portion with the highest luminance of the first surface 20a is the maximum value, i.e., 255.

[0097] In the grayscale image of the first surface 20a, a high-brightness reflective region HL is identified. The high-brightness reflective region HL of the grayscale image is a region that includes pixels in the grayscale image that have a pixel value ranging from 129 to 255. Therefore, the "proportion of the high-brightness reflective region HL" is the proportion of pixels having a pixel value ranging from 129 to 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 regions 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] From the viewpoint of improving the visibility of images, an upper limit value for the high-brightness display region HI described below may be set in the display system 1 shown in Figures 1 to 6. 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 the first light L1 and the second light L2 are irradiated onto the decorative sheet 20 superimposed on the display device 16 from the second surface 20b, as shown in FIG. 10. The first light L1 is light simulating external light irradiated onto the display system 1. As shown in FIG. 10, the first light L1 is light incident on the first surface 20a of the decorative sheet 20 at an incident angle of 21.75°. The second light L2 is light 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. As the lens device, the above-mentioned VH-Z20R manufactured by Keyence Corporation is used. As the camera device, a camera device capable of generating a captured image using this lens device is used. The lens device includes the above-mentioned objective lens 91 and an illumination unit 92. The illumination unit 92 irradiates the first surface 20a of the decorative sheet 20 with the first light L1.

[0102] 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 with light by the one-way illumination described above. The angle of incidence of the light irradiated from the illumination unit 92 to the standard white plate is 21.75°. The luminance of the center of gravity of the standard white plate in this state is measured by 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 luminance in the imaging environment is stable, i.e., the luminance measured by the above-mentioned method is 10,000 cd / m for one minute. 2 ~30000cd / m 2 Make sure that it is located in the range of

[0104] 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 to be imaged has a length of 15.24 mm in the longitudinal direction and a length of 11.40 mm in the width direction. When the first surface 20a is imaged, the magnification of the objective lens 91 is 20 times. As shown in FIG. 10, the display system 1 is placed on the stage of the 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 can emit light from the 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 from the display device 16 as the 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 in order to adjust the amount of the 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 the 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 imaging of the decorative sheet 20, the amount of light 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 light of the second light L2. The luminance in the first area A1 of the display system 1 is adjusted by the above-mentioned light control filter F. The amount of light of the first 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 light 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 45000:1000.

[0107] The above-mentioned ratio (45000:1000) between the luminance of the first light L1 and the luminance of the second light L2 mimics a state in which the display system 1 displays an image IM indoors where external light shines 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 indoors where external light shines 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 a size 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 between black, gray, and white depending on the pixel value. Each pixel has a pixel value between 0 and 255 depending on the luminance of the portion of the first surface 20a corresponding to the pixel. The higher the pixel value of a pixel in the grayscale image of the first surface 20a, the brighter the color of the pixel. Thus, the higher the luminance 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 portion with the highest luminance of the first surface 20a is the maximum value, i.e., 255.

[0110] In the grayscale image on the first surface 20a, a high-luminance display region HI is identified. The high-luminance display region HI of the grayscale image is a region that includes pixels having a pixel value ranging from 129 to 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 parts in Fig. 11 indicate the high brightness display region HI. That is, the pixels corresponding to the white parts in Fig. 11 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.

[0112] In the display system 1 shown in Figs. 1 to 6, a lower limit is set as described above with respect to 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 entering is reproduced, the expansion of the high brightness display region HI is suppressed. Therefore, even in a state in which daytime external light enters 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 observable 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 observable 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 luminance 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 a specific example, the above-mentioned specific example does not limit the embodiment. The above-mentioned embodiment can be embodied in various other specific examples, and various omissions, substitutions, changes, additions, etc. can be made without departing from the spirit of the embodiment.

[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-mentioned specific example are designated by the same reference numerals as those used for the corresponding parts in the above-mentioned specific example, and duplicated descriptions will be omitted.

[0118] The decorative sheet 20 described above includes a light-shielding layer 24 having 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 limited thereto, and as shown in Fig. 12, the light-shielding layer 24 may be omitted in 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 present invention is not limited to this, and the decorative sheet 20 does not have to 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 the light incident on the second surface 20b of the decorative sheet 20. The illustrated pattern mask layer 28 has a visible light blocking property. The pattern mask layer 28 may contain a binder resin and light absorbing particles dispersed in the binder resin, similar to the above-mentioned light blocking layer 24. The light absorbing particles may contain a black pigment such as carbon black or titanium black. The pattern mask layer 28 may contain a light interference pigment instead of the light absorbing particles. The light interference pigment may be an aluminum pigment, for example.

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

[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 capable of displaying an image IM and a design D. In the display system 1, the area of ​​the decorative sheet 20 overlapping with a portion other than the recesses 20r becomes a second area A2.

[0124] 12 shows the decorative sheet 20 including the pattern mask layer 28 but not the light-shielding layer 24, the decorative sheet 20 may include both the light-shielding layer 24 and the pattern mask layer 28 as shown in FIG. 13. In other words, the light-shielding layer 24 may be disposed in the decorative portion 21 even in the decorative sheet 20 including the pattern mask layer 28. In such a decorative sheet 20, the recess 20r may be overlapped by the decorative portion 21 or the non-decorated portion 22. In such a decorative sheet 20, the overlapping portion where the non-decorated 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 the 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 decorative sheet 20 forms the outer surface of the decorative member 40 on a first surface 20a.

[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 be produced by solidifying an injected resin injected into a cavity formed in an injection molding device.

[0128] The decoration member 40 may have a three-dimensional shape as shown in Fig. 14. The illustrated decoration member 40 is curved in the first direction D1 at both ends in the second direction D2. The curved portions of the decoration 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. EXAMPLES

[0130] An embodiment of the present disclosure will be described in more detail with reference to examples. 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 above-mentioned method. The produced decorative sheet had a first surface and a second surface opposite to the first surface. The produced decorative sheet had a decorative portion forming a design and a non-decorated portion not forming a design. The produced decorative sheet 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 produced decorative sheet 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 decorative portion.

[0132] <Example 1> A film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the base layer. A coating film was formed by applying a resin composition onto 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 a coloring material (inorganic pigment and photoluminescent pigment). 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. In the non-decorated areas, the design layer and the light-shielding layer were removed by laser etching. The non-decorated areas were arranged in a two-dimensional array. Each of the non-decorated areas had a circular shape with a diameter of 60 μm.

[0133] The base layer was exposed in the area where the design layer and the light-shielding layer were 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 having a thickness of 50 μm ("CS9862UAS" manufactured by Nitto Denko Corporation). A surface layer was overlaid on the adhesive layer. An acrylic resin film having a thickness of 125 μm ("SD015NAH" manufactured by Kaneka Corporation) was used as the surface layer. In this manner, a decorative sheet according to Example 1 was obtained.

[0134] <Example 2> Except for the design of the design layer, the decorative sheet according to Example 2 had the same configuration as the decorative sheet according to Example 1. In the decorative sheet according to Example 2, the design layer had a second geometric pattern as the design.

[0135] <Example 3> Except for the design of the design layer, the decorative sheet according to Example 3 had the same configuration as the decorative sheet according to Example 1. 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 structure 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 structure 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 structure 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 structure 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 structure 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 a design.

[0141] <Example 9> The decorative sheet according to Example 9 had the same structure 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 9, the non-decorated portion 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 was measured by the SCI method using the reflected light with the first surface as the incident surface. * a * b * The L value in the L*a*b* color system * 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, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in the column of "SCI L value" in Tables 1 to 3 below. * *

[0149] <L value by SCE method> * For each example and each comparative example, the L value in the L*a*b* color system was measured by the SCE method using the reflected light with the first surface as the incident surface. * a * b * The L value in the L*a*b* color system * 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, Inc.) conforming to JIS Z 8722:2009. The measurement results are shown in the column of "SCE L value" in Tables 1 to 3 below. * *

[0150] <Ratio of L value by SCI method to total light transmittance> * 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 column of "SCI / transmittance" in Tables 1 to 3 below. *

[0151] <Ratio of L value by SCE method to total light transmittance> * 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 column of "SCE / transmittance" in Tables 1 to 3 below. *

[0152] <High-brightness reflection region> ​​​​​​​​​For each of the examples and comparative examples, the proportion of the high-brightness reflective area was calculated 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 open area. The open area displayed the character string "ECO." The area of ​​the open 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" is 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. As the standard white plate, a white plate attached to the white calibration cap of the spectrophotometer "CM-700d" manufactured by Konica Minolta, Inc. was used. The standard white plate was placed on the stage so that the center of gravity of the standard white plate faced the objective lens. The distance between the objective lens and the standard white plate was 300 mm. Light was irradiated from the illumination unit of the lens device to the standard white plate placed on the stage by the above-mentioned one-way illumination. The angle of incidence of the light irradiated from the illumination unit to 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 one minute. 2 ~30000cd / m 2 It was confirmed that the luminance meter was located in 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 of the Examples and Comparative Examples were overlaid on a display device. A display system was formed including the decorative sheets according to each of the Examples and Comparative Examples. The display system was placed on the stage of an optical microscope. On the stage, the display system was placed at a position where 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 control filter ("ND filter" manufactured by Fujifilm Corporation) was overlaid 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 control 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 45000:1000.

[0157] In a display system including each of the examples and comparative examples, the illumination section 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 section 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, an image of the opening area was captured, and a grayscale image of the display surface was obtained. From the obtained grayscale image, the area of ​​the high brightness display area was calculated by the method described above. It was calculated how many times the area of ​​the calculated high brightness display area was as compared to the area of ​​the above-mentioned opening area. The calculation results are shown in the "High Brightness Display Area" column of Tables 1 to 3.

[0158] <Evaluation> The lighting section 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 according to each of the examples and comparative examples. 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: Eight or more 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 see the string "ECO." C: Fewer than four observers were able to see 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: aperture 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 reflectance value of 25.0 or more and 45.0 or less when measured by an SCI method using reflected light with the first surface as an 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 reflectance value of 6.0 or more and 29.5 or less when measured by an SCE method using reflected light with the first surface as an incident surface.

3. The total light transmittance [%] is 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 2, wherein the ratio of the values ​​is 0.5 or more and 1.5 or less.

4. The total light transmittance [%] is measured by the SCE 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 2, wherein the ratio of the values ​​is 0.1 or more and 1.0 or less.

5. 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.

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

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

Images