Decorative sheet, display device with decorative sheet, sheet article, and method for manufacturing decorative sheet

Abstract

To provide a decorative sheet, a display device with a decorative sheet, a sheet article, and a method for manufacturing a decorative sheet. [Solution] The decorative sheet 20 has a decorative layer. The decorative layer has holes arranged in multiple directions. The average value and standard deviation of the arrangement pitch of the holes arranged in a first arrangement direction, which is the smallest among the multiple directions, and the average value and standard deviation of the arrangement pitch of the holes arranged in a second arrangement direction, which is the second smallest among the multiple directions, satisfy specific conditions.

Description

[Technical Field]

[0001] This disclosure relates to decorative sheets, display devices with decorative sheets, sheet articles, and methods for manufacturing decorative sheets. [Background technology]

[0002] A decorative sheet is known that is placed on top of a display device. The decorative sheet disclosed in JP2001-331132A has a decorative layer. The decorative layer is provided with numerous micropores through which image light from the display device can pass. The decorative sheet disclosed in JP2001-331132A conceals the display device when it is not displaying anything and also adds aesthetic appeal. At the same time, the image displayed by the display device can be observed through the decorative sheet.

[0003] However, when observing the image on the display device through the decorative sheet, a striped pattern was sometimes observed. That is, when the display device was set to display, a striped pattern was sometimes observed. This striped pattern has no relation to the design displayed by the decorative sheet, nor to the image displayed by the display device. The striped pattern consists of multiple lines arranged at a pitch observable to the naked eye. Each line extends linearly in a direction intersecting the direction of arrangement. [Disclosure of the Invention]

[0004] This disclosure aims to suppress the occurrence of striped patterns.

[0005] A decorative sheet according to one embodiment is It is equipped with a decorative layer that displays the design, The decorative layer is provided with holes arranged in multiple directions. The average value A of the arrangement pitch of the holes arranged in the first arrangement direction, which has the smallest average value of the arrangement pitch of the holes among the multiple directions. A1 It is between 40 μm and 400 μm. The standard deviation σ of the arrangement pitch of the holes arranged in the first arrangement direction A1 Three times that is less than 20 μm, The aforementioned standard deviation σ A1 (μm) The above average value A A1 The ratio to (μm) is 0.0060 or greater. The average value A of the arrangement pitch of the holes arranged in the second arrangement direction, which is the second smallest average value of the arrangement pitch of the holes among the multiple directions. A2 It is between 40 μm and 400 μm. The standard deviation σ of the arrangement pitch of the holes arranged in the second arrangement direction A2 Three times that is less than 20 μm, The aforementioned standard deviation σ A2 (μm) The above average value A A2 The ratio to (μm) is 0.0060 or greater.

[0006] According to this disclosure, the occurrence of striped patterns can be suppressed. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a diagram illustrating one embodiment, and is a schematic exploded perspective view showing an example of a display device with a decorative sheet. [Figure 2] Figure 2 is a cross-sectional view of the display device with decorative sheet shown in Figure 1. [Figure 3A] Figure 3A shows an example of an application of the decorative sheet-equipped display device shown in Figure 1. [Figure 3B] Figure 3B shows an example of an application of the decorative sheet-equipped display device shown in Figure 1. [Figure 3C] Figure 3C shows an example of an application of the decorative sheet-equipped display device shown in Figure 1. [Figure 4] Figure 4 is a front view showing the display device with the decorative sheet shown in Figure 1, and it shows the display device in the display state. [Figure 5] Figure 5 is a plan view showing an example of the pixel arrangement of a display device included in the decorative sheet display device shown in Figure 1. [Figure 6A] Figure 6A is a cross-sectional view showing an example of a decorative sheet included in the display device with a decorative sheet shown in Figure 1. [Figure 6B]Figure 6B is a cross-sectional view showing another example of a decorative sheet included in the display device with decorative sheet shown in Figure 1. [Figure 6C] Figure 6C is a cross-sectional view showing another example of a decorative sheet included in the display device with decorative sheet shown in Figure 1. [Figure 7] Figure 7 is an enlarged plan view showing a decorative sheet that may be included in the display device with a decorative sheet shown in Figure 1, and shows the arrangement of holes provided in the decorative sheet. [Figure 8] Figure 8 shows an example of a method for manufacturing a decorative sheet that may be included in the display device with a decorative sheet shown in Figure 1. [Figure 9] Figure 9 shows an example of a method for manufacturing a decorative sheet that may be included in the display device with a decorative sheet shown in Figure 1. [Figure 10] Figure 10 shows the sheet articles used in the manufacture of the decorative sheet shown in Figure 1. [Figure 11] Figure 11 shows a modified example of a laser irradiation device used in the manufacturing of the decorative sheet shown in Figure 1. [Figure 12] Figure 12 is a cross-sectional view showing another example of a decorative sheet. [Figure 13] Figure 13 is a schematic top view showing a manufacturing apparatus for decorative sheets. [Figure 14A] Figure 14A is a cross-sectional view showing another example of a decorative sheet. [Figure 14B] Figure 14B is a cross-sectional view showing another example of a decorative sheet. [Figure 14C] Figure 14C is a cross-sectional view showing another example of a decorative sheet. [Figure 15A] Figure 15A is a cross-sectional view showing another example of a decorative sheet. [Figure 15B] Figure 15B is a cross-sectional view showing another example of a decorative sheet. [Figure 15C] Figure 15C is a cross-sectional view showing another example of a decorative sheet. [Figure 15D] Figure 15D is a cross-sectional view showing another example of a decorative sheet. [Figure 16]FIG. 16 is a diagram showing a modified example of the arrangement of a laser irradiation device used for manufacturing the decorative sheet of FIG. 1. [Figure 17] FIG. 17 is a cross-sectional view showing another example of the decorative sheet.

DETAILED DESCRIPTION OF THE INVENTION

[0008] A decorative sheet according to an embodiment includes a decorative layer for displaying a design, holes are provided in the decorative layer and arranged in a plurality of directions, an average value A of the arrangement pitches of the holes arranged in a first arrangement direction in which the average value of the arrangement pitches of the holes among the plurality of directions is the smallest A1 is 40 μm or more and 400 μm or less, a standard deviation σ of the arrangement pitches of the holes arranged in the first arrangement direction A1 tripled is 20 μm or less, the standard deviation σ A1 (μm) of the average value A A1 (μm) ratio to is 0.0060 or more, an average value A of the arrangement pitches of the holes arranged in a second arrangement direction in which the average value of the arrangement pitches of the holes among the plurality of directions is the second smallest A2 is 40 μm or more and 400 μm or less, a standard deviation σ of the arrangement pitches of the holes arranged in the second arrangement direction A2 tripled is 20 μm or less, the standard deviation σ A2 (μm) of the average value A A2 (μm) ratio to is 0.0060 or more. That is, in the decorative sheet according to an embodiment, the following conditions are satisfied. 40 μm ≤ A A1 ≤ 400 μm 40 μm ≤ A A2 ≤ 400 μm 3 × σ A1 ≤ 20 μm 3 × σ A2 ≤ 20 μm 0.0060 ≤ σ A1 / A A1 0.0060≦σ A2 / A A2

[0009] In a decorative sheet according to one embodiment, the average value A of the diameter of the holes provided in the decorative layer D Standard deviation σ of the hole diameter relative to (μm) D The ratio of (μm) may be 0.080 or less. In other words, the following conditions may be met. σ D / A D ≤0.080

[0010] In a decorative sheet according to one embodiment, the average value A of the arrangement pitch of the holes arranged in the first arrangement direction. A1 (μm) and the standard deviation σ A1 (μm) and the average value A of the arrangement pitch of the holes arranged in the second arrangement direction. A2 (μm) and the standard deviation σ A2 (μm) and may satisfy the following conditions. |σ A1 / A A1 -σ A2 / A A2 |≦0.0010

[0011] In a decorative sheet according to one embodiment, the decorative layer may include a design layer for displaying a design and a light-shielding layer laminated with the design layer.

[0012] In a decorative sheet according to one embodiment, the decorative layer may further include a white layer located between the design layer and the light-shielding layer.

[0013] A decorative sheet according to one embodiment is The substrate further comprises the decorative layer laminated with the aforementioned decorative layer, The light-shielding layer is located between the substrate and the design layer. The width of the hole at its base end, which is close to the substrate, may be narrower than the width of the hole at its tip, which is further away from the substrate.

[0014] In a decorative sheet according to one embodiment, the average value A of the diameter of the holes provided in the decorative layer D The particle size may be between 20 μm and 200 μm.

[0015] In a decorative sheet according to one embodiment, the opening ratio of the decorative layer may be 5% or more and 50% or less.

[0016] In one embodiment of the decorative sheet, the total light transmittance may be 3% or more and 40% or less.

[0017] In a decorative sheet according to one embodiment, the thickness of the decorative layer may be 1 μm or more and 20 μm or less.

[0018] A decorative sheet according to one embodiment may further comprise a transparent substrate laminated with the decorative layer.

[0019] In a decorative sheet according to one embodiment, the decorative layer may include one or more materials selected from wood, natural fibers, natural leather, natural stone, synthetic fibers, synthetic leather, and artificial stone.

[0020] A display device with a decorative sheet according to one embodiment is: Display device and The device comprises the display device and one of the decorative sheets described above according to this disclosure, which is arranged in overlapping position with the display device.

[0021] In a display device with a decorative sheet according to one embodiment, the array pitch of pixels that display the same color included in the display device may be 40 μm or more and 500 μm or less.

[0022] A sheet article according to one embodiment comprises any of the decorative sheets described above in this disclosure.

[0023] In a sheet article according to one embodiment, The first arrangement direction of the decorative sheet may be inclined with respect to the longitudinal direction of the sheet article. The second arrangement direction of the decorative sheet may be inclined with respect to the longitudinal direction of the sheet article.

[0024] A sheet article according to one embodiment is It is wound around the winding axis, The first arrangement direction of the decorative sheet may be inclined with respect to the winding axis. The second arrangement direction of the decorative sheet may be inclined with respect to the winding axis.

[0025] A method for manufacturing a decorative sheet according to one embodiment is: A process for creating a laminate including a base decorative layer on which a design has been formed, The process includes the step of intermittently irradiating the laminate with laser light from multiple irradiation ports while moving the laminate relative to a laser irradiation device having multiple irradiation ports, thereby forming holes in the base decorative layer, In the step of forming the holes, the laminate is moved relative to the laser irradiation device in a direction nonparallel to the arrangement direction of the plurality of irradiation ports, and at least one of the relative movement speed of the laminate with respect to the laser irradiation device and the irradiation time interval of the laser light from the irradiation ports is varied.

[0026] In the step of forming the holes in the method for manufacturing a decorative sheet according to one embodiment, the laminate may be moved relative to the laser irradiation device in a direction inclined with respect to the arrangement direction of the plurality of irradiation ports.

[0027] In a method for manufacturing a decorative sheet according to one embodiment, The holes in the manufactured decorative sheet are arranged in multiple directions. The first alignment direction in which the average value of the hole alignment pitch is smallest among the aforementioned multiple directions may be non-parallel to the inclined direction.

[0028] In a method for manufacturing a decorative sheet according to one embodiment, the second arrangement direction in which the average value of the arrangement pitch of the holes among the plurality of directions is the second smallest may be non-parallel to the inclined direction.

[0029] In a method for manufacturing a decorative sheet according to one embodiment, the arrangement pitch of the holes in the manufactured decorative sheet in a direction parallel to the relative movement direction of the laminate with respect to the laser irradiation device may be longer than the arrangement pitch of the irradiation ports.

[0030] In a method for manufacturing a decorative sheet according to one embodiment, the relative movement speed of the laminate with respect to the laser irradiation device and the time interval of irradiation of the laser light from the irradiation port may be varied in parallel for at least a portion of the period.

[0031] In the step of forming the holes in the method for manufacturing a decorative sheet according to one embodiment, the laser light that has passed through the film material may be irradiated onto the base decorative layer.

[0032] In a method for manufacturing a decorative sheet according to one embodiment, the absorption rate of the laser light of the base decorative layer may be 3% or more.

[0033] In a method for manufacturing a decorative sheet according to one embodiment, the absorption rate of the laser light of the film material may be lower than the absorption rate of the laser light of the base decorative layer.

[0034] In a method for manufacturing a decorative sheet according to one embodiment, The base decorative layer includes the base design layer and the base light-shielding layer. The base light-shielding layer is located between the film material and the base design layer. The absorption rate of the laser light in the base light-shielding layer may be 3% or more.

[0035] In a method for manufacturing a decorative sheet according to one embodiment, The base decorative layer includes the base design layer and the base light-shielding layer. The base light-shielding layer is located between the film material and the base design layer. The absorption rate of the laser light of the film material may be lower than the absorption rate of the laser light of the base light-shielding layer.

[0036] In a method for manufacturing a decorative sheet according to one embodiment, The base decorative layer includes the base design layer and the base light-shielding layer. The base light-shielding layer is located between the film material and the base design layer. The base light-shielding layer may be in contact with the film material.

[0037] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that, for the sake of illustration and ease of understanding, the scale and aspect ratios of the drawings attached to this specification have been appropriately altered and exaggerated from those of the actual objects.

[0038] In this specification, terms such as "parallel," "perpendicular," and "identical," as well as values ​​for length and angle, which specify shapes, geometric conditions, and their degrees, shall not be limited to their strict meanings, but shall be interpreted to include a range that can be expected to function similarly.

[0039] In this specification, terms such as "sheet," "film," and "plate" are not distinguished from each other solely on the basis of differences in name. For example, a "decorative sheet" cannot be distinguished from components such as decorative films or decorative plates solely on the basis of differences in name.

[0040] In this specification, if multiple candidate upper limits and multiple candidate lower limits are given for a certain parameter, the numerical range of that parameter may be constructed by combining any one candidate upper limit and any one candidate lower limit. For example, consider the case where it is stated that "Parameter B is, for example, A1 or greater, and may be A2 or greater, and may be A3 or greater. Parameter B is, for example, A4 or less, and may be A5 or less, and may be A6 or less." In this case, the numerical range of parameter B may be A1 or greater and A4 or less, A1 or greater and A5 or less, A1 or greater and A6 or less, A2 or greater and A4 or less, A2 or greater and A5 or less, A2 or greater and A6 or less, A3 or greater and A4 or less, A3 or greater and A5 or less, and A3 or greater and A6 or less.

[0041] To clarify directional relationships between drawings, some drawings use arrows with common symbols to indicate common directions. The tip of the arrow represents one side of each direction. Additionally, arrows pointing from the drawing plane towards the viewer, along the direction perpendicular to the drawing plane, are indicated by a symbol consisting of a dot inside a circle, as shown in Figure 2, for example.

[0042] Figures 1 to 17 illustrate one embodiment. Of these, Figures 1 and 2 are schematic exploded perspective views and cross cross views showing one specific example of a decorative sheet-equipped display device 1. As shown in Figures 1 and 2, the decorative sheet-equipped display device 1 comprises a display device 10 and a decorative sheet 20 superimposed on the display device 10. In this decorative sheet-equipped display device 1, when the display device 10 is in a non-display state, the decorative sheet conceals the display device 10 and further expresses the design (see Figure 1). On the other hand, when the display device 10 is displaying an image, the image can be observed through the decorative sheet 20 (Figure 4). Furthermore, the decorative sheet 20 in this embodiment is designed to suppress the striped pattern that occurs on the decorative sheet when the display device 10 is in a display state. More specifically, the decorative layer 30 of the decorative sheet 20 is provided with holes 22 for allowing image light to pass through, and the arrangement of the holes 22 is designed.

[0043] An embodiment will be described below with reference to the illustrated example.

[0044] As shown in Figures 1 and 2, the decorative sheet-equipped display device 1 comprises a display device 10 and a decorative sheet 20. The display device 10 has a display surface 11. The decorative sheet 20 covers the display surface 11. The decorative sheet-equipped display device 1 can express designs using the decorative sheet 20. With this decorative sheet 20, the display device 10 can be installed in harmony with the surrounding environment.

[0045] In the illustrated example, the display surface 11 has a rectangular shape in plan view. The rectangular display surface 11 extends in a first direction D1 and a second direction D2. The display device 10 and the decorative sheet 20 are stacked in a third direction D3 which is normal to the display surface 11 and perpendicular to both the first direction D1 and the second direction D2.

[0046] The decorative sheet display device 1 shown in Figures 1 and 2 is shown in a flat shape. However, the decorative sheet display device 1 may be curved by curving each component of the decorative sheet display device 1. For example, only the decorative sheet 20 may be curved. Alternatively, the decorative sheet 20 and at least the display surface 11 of the display device 10 may be curved.

[0047] The decorative sheet display device 1 is applicable to a variety of uses. The decorative sheet display device 1 can be applied to the interior of mobile objects as movable devices. Examples of mobile objects include automobiles, ships, and airplanes. In one specific example shown in Figure 3A, the decorative sheet display device 1 is applied to the center console of an automobile. In the example in Figure 3A, the decorative sheet display device 1 can constitute a car navigation system, stereo, communication terminal, etc. The decorative sheet display device 1 can also be applied to the interior of buildings, such as walls, doors, ceilings, and partitions. Furthermore, the decorative sheet display device 1 can be applied to various devices such as furniture and home appliances. In the example shown in Figure 3B, the decorative sheet display device 1 is applied to a desk. In the example shown in Figure 3C, the decorative sheet display device 1 is applied to a refrigerator.

[0048] The display device 10 employs a dot matrix system. The display device 10 has multiple pixels that form each dot. The display device 10 forms a desired image on the display surface 11 by controlling the light emission state of each pixel. Examples of the display device 10 include liquid crystal displays and electroluminescent displays, also known as EL displays.

[0049] In the example shown in Figure 2, the display device 10 includes a surface light source device 12 and a display panel 15. The surface light source device 12 is a device that emits light in a planar manner. The surface light source device 12 has a light-emitting surface 13. The light-emitting surface 13, like the display surface 11, has a rectangular shape in a planar view. The light-emitting surface 13 has edges that extend along both the first direction D1 and the second direction D2. The surface light source device 12 is not particularly limited, and various types, such as edge-lit or direct-lit devices, may be used. The display panel 15 is stacked with the surface light source device 12 in the third direction D3. The display panel 15 is, for example, a liquid crystal display panel. The display panel 15 may form an image by controlling the transmission of planar light from the surface light source device 12 on a pixel-by-pixel basis.

[0050] Figure 5 shows an example of a pixel arrangement in the display device 10. The illustrated display device 10 includes a first pixel 16A, a second pixel 16B, and a third pixel 16C that emit different colors from each other. The multiple first pixels 16A are arranged in a first pixel arrangement direction DP1 and a second pixel arrangement direction DP2 that are non-parallel to each other. In particular, in the illustrated example, the first pixel arrangement direction DP1 and the second pixel arrangement direction DP2 are perpendicular. The multiple first pixels 16A are arranged in the first pixel arrangement direction DP1 with a first pixel arrangement pitch P P1 They are arranged in the second pixel array direction DP2 and the second pixel array pitch P P2 They are arranged in this way.

[0051] Similarly, multiple second pixels 16B are arranged in the first pixel array direction DP1 and at the first pixel array pitch P P1 They are arranged in the following order. Multiple second pixels 16B are arranged in the second pixel arrangement direction DP2 with a second pixel arrangement pitch P P2 They are arranged in the first pixel array direction DP1 and the first pixel array pitch P P1 They are arranged in the second pixel array direction DP2 and the second pixel array pitch P P2 They are arranged in this way.

[0052] The first pixel 16A, the second pixel 16B, and the third pixel 16C are arranged alternately in the first pixel arrangement direction DP1. Multiple first pixels 16A are arranged consecutively in the second pixel arrangement direction DP2. Multiple second pixels 16B are arranged consecutively in the second pixel arrangement direction DP2. Multiple third pixels 16C are arranged consecutively in the second pixel arrangement direction DP2. A unit pixel is formed by one first pixel 16A, one second pixel 16B, and one third pixel 16C arranged consecutively in the first pixel arrangement direction DP1. Figure 5 illustrates a single unit pixel by enclosing it with a dotted line.

[0053] For example, the first pixel 16A emits red image light. The second pixel 16B emits green image light. The third pixel 16C emits blue image light. In the illustrated example, the first pixel arrangement direction DP1 is parallel to the first direction D1. The second pixel arrangement direction DP2 is parallel to the second direction D2.

[0054] The pixel arrangement in the display device 10 is not limited to the illustrated example, and various configurations may be adopted. The pixel arrangement pitch of the display device 10 to which the decorative sheet 20 is applied may be, for example, 40 μm to 500 μm. Within this range, the occurrence of striped patterns can be effectively suppressed when combined with the decorative sheet 20 according to this embodiment, which employs the hole arrangement described later. Also, the pixel arrangement pitch of the display device 10 that can be used in a mobile device, as shown in Figures 3A to 3C, may be, for example, 40 μm to 200 μm. The pixel arrangement pitch of the display device 10 that can be used in home appliances, furniture, etc., may be, for example, 120 μm to 300 μm. A display device 10 having such a pixel arrangement can more effectively suppress the occurrence of striped patterns when combined with the decorative sheet 20 according to this embodiment, which employs the hole arrangement described later. Note that the pixel arrangement pitch refers to the so-called sub-pixel arrangement pitch P. P1 ,P P2 In other words, the pixel array pitch is the array pitch between pixels of the same color among the multiple pixels included in a display device.

[0055] As shown in Figures 1 and 2, the decorative sheet-equipped display device 1 may further include a panel member 18. The illustrated display panel 15 is located between the display device 10 and the decorative sheet 20 in a third direction D3. The panel member 18 is provided with a transparent region 18a. The transparent region 18a may be an opening or a transparent portion provided in the panel member 18. The transparent region 18a is placed on top of the display surface 11 of the display device 10. Image light from the display device 10 passes through the transparent region 18a and heads toward the decorative sheet 20. The panel member 18 may, for example, be configured as a panel material, wall material, casing, etc., at the location where the display device 10 is installed. The decorative sheet 20 may be bonded to the panel member 18.

[0056] In the examples shown in Figures 1 and 2, the display surface 11 is located across the entire transparent region 18a of the panel member 18. The decorative sheet 20 covers at least the entire transparent region 18a of the panel member 18. The illustrated decorative sheet 20 extends across the entire panel member 18. However, the illustrated examples are not limited to this, and the decorative sheet 20 may cover the entire transparent region 18a, or it may cover only a portion of the area of ​​the panel member 18 other than the transparent region 18a. The decorative sheet 20 may also cover only the entire transparent region 18a.

[0057] Unlike the illustrated example, the panel member 18 may be positioned on the opposite side of the display device 10 in the third direction D3 with respect to the decorative sheet 20. That is, the decorative sheet 20 may be positioned between the panel member 18 and the display device 10 in the third direction D3. Furthermore, the panel member 18 may be omitted.

[0058] In this specification, "transparent" means that the visible light transmittance is 50% or more, preferably 80% or more. Unless otherwise specified, visible light transmittance refers to the light transmittance in the visible light range and is determined as the average value of the transmittance at each wavelength when measured at an incident angle of 0° every 1 nm within the measurement wavelength range of 380 nm to 780 nm using a spectrophotometer (Shimadzu Corporation "UV-3100PC", compliant with JIS K 0115).

[0059] Next, the decorative sheet 20 will be described. The decorative sheet 20 has a design and adds aesthetic appeal to the display device 1 with the decorative sheet. The decorative sheet 20 is also configured to allow image light from the display device 10 to pass through. The decorative sheet 20 has a decorative layer 30 that displays the design expressed by the decorative sheet 20. That is, the decorative layer 30 is decorated. Holes 22 are provided in the decorative layer 30 so that image light can pass through.

[0060] The decorative sheet 20 covers at least the entire display surface 11 so that the display surface 11 is not directly observed from the outside. In the illustrated example, the decorative sheet 20 is located on the observer side of the display device 1 with the decorative sheet in the third direction D3. The decorative sheet 20 as a whole is a flat plate-shaped member that extends in the same direction as the display surface 11 of the display device 10. The thickness of the decorative sheet 20 may be, for example, 20 μm or more and 550 μm or less.

[0061] The illustrated decorative sheet 20 has a rectangular shape in plan view. Plan view means observation from a third direction D3. The decorative sheet 20 includes a first end side 20a and a second end side 20b that extend parallel to each other as long sides. The decorative sheet 20 further includes a third end side 20c and a fourth end side 20d that extend parallel to each other as short sides. As shown in Figure 1, the first end side 20a and the second end side 20b extend linearly in the first direction D1. The third end side 20c and the fourth end side 20d extend linearly in the second direction D2 which is perpendicular to the first direction D1.

[0062] Figure 6A shows a specific example of a decorative sheet 20. This decorative sheet 20 further has a base material 25 that supports the decorative layer 30. The base material 25 is in the form of a sheet. The base material 25 is laminated with the decorative layer 30 in a third direction D3. In the example shown in Figure 6A, the base material 25 is located between the decorative layer 30 and the display device 10 in the third direction D3. The base material 25 may be transparent. Image light is transmitted through the base material 25. A resin film can be used as the base material 25. Examples of materials for the base material 25 include polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, cyclic polyolefin, and ABS (acrylonitrile butadiene styrene copolymer). The thickness of the base material 25 is, for example, 10 μm to 500 μm, taking into consideration visible light transmittance and appropriate support for the decorative layer 30.

[0063] The decorative layer 30 will now be described. The decorative layer 30 is given a design. The decorative layer 30 displays the design. As shown in Figure 6A, the decorative layer 30 may have a design layer 32 and a light-shielding layer 34 laminated in the third direction D3. The light-shielding layer 34 is closer to the display device 10 in the third direction D3 than the design layer 32. The light-shielding layer 34 is located between the design layer 32 and the display device 10 in the third direction D3. In the illustrated example, the hole 22 penetrates both the design layer 32 and the light-shielding layer 34.

[0064] The design layer 32 has a design formed on it that is displayed on the decorative sheet 20. The design layer 32 may have designs such as figures, patterns, designs, colors, pictures, photographs, characters, marks, pictograms, letters, and numbers. The design layer 32 can also have a design expression that displays a background. For example, the design layer 32 may display wood grain or marble patterns, metallic textures, or geometric patterns as designs that can harmonize the decorative sheet with the surrounding environment on which the decorative sheet-equipped display device 1 is installed. The design layer 32 may be formed by printing. For example, the design layer 32 may be a printed layer formed by printing on the light-shielding layer 34. The design layer 32 may also be formed by transfer. The design layer 32 may be a transferred layer transferred on the light-shielding layer 34. The thickness of the design layer 32 may be, for example, 1 μm or more and 20 μm or less.

[0065] The light-shielding layer 34 is a dark-colored layer. The light-shielding layer 34 can display a design as a dark-colored layer. The light-shielding layer 34 is a layer having a lower visible light transmittance than the design layer 32. The visible light transmittance of the light-shielding layer 34 is lower than the visible light transmittance of the design layer 32. The light-shielding layer 34 may have light-shielding properties. The light-shielding properties may be controlled by the thickness of the light-shielding layer 34. The light-shielding layer 34 covers the design layer 32 from the display device 10. The light-shielding layer 34 suppresses the incidence of image light from the display device 10 onto the design layer 32. With the light-shielding layer 34, it is possible to suppress the transmission of image light through the design layer 32 when displaying an image. The light-shielding layer 34 includes, for example, a binder resin and light-absorbing particles dispersed in the binder resin. Examples of light-absorbing particles include black pigments such as carbon black and titanium black. The light-shielding layer 34 has sufficient thickness, allowing the design formed by the design layer 32 to be displayed clearly and vividly. The thickness of the light-shielding layer 34 may be between 1 μm and 20 μm.

[0066] Unlike the illustrated example, the decorative sheet 20 may further have a base layer between the decorative layer 30 and the light-shielding layer 34. The base layer can be composed of layers of various colors. That is, by providing a base layer, the color of the design layer 32 can be selected without being restricted by the light-shielding layer 34. For example, the base layer may be a white layer. Since a white base layer has scattering reflectivity, the design can be clearly displayed by the design layer 32.

[0067] As described above, the decorative layer 30 is provided with holes 22 that allow image light to pass through. The decorative layer 30 includes a decorative portion 30A that forms the design and a transparent portion 30B that is an unformed portion of the decorative portion 30A. The decorative portion 30A is formed by the region of the decorative layer 30 that does not have holes 22. The transparent portion 30B is formed by the region of the decorative layer 30 that has holes 22. In other words, the decorative portion 30A is the part where the design layer 32 is formed. The transparent portion 30B is the unformed portion of the decorative layer 30 that is part of the decorative portion 30A. The transparent portion 30B is the unformed portion of the design layer 32 that is part of the decorative layer 30. The transparent portion 30B is the part of the decorative sheet 20 through which image light from the display device 10 passes. Therefore, the transparent portion 30B has high visible light transmittance.

[0068] As shown in the examples in Figures 6A to 6C, the hole 22 that allows image light to pass through may be a through-hole formed in the decorative layer 30. In the examples shown in Figures 6A to 6C, the decorative layer 30 includes a design layer 32 and a light-shielding layer 34. The hole 22 penetrates both the design layer 32 and the light-shielding layer 34. As will be described later, the hole 22 that allows image light to pass through does not have to be a through-hole that penetrates the entire thickness of the decorative layer 30.

[0069] In the example shown in Figure 6A, the hole 22 forming the transparent portion 30B opens on the side opposite to the display device 10. The transparent portion 30B shown in Figure 6A is a void. However, this is not the only example. In the example shown in Figure 6B, the decorative sheet 20 further has a cover layer 36 that covers the decorative layer 30 from the side opposite to the base material 25 in the third direction D3. The cover layer 36 is transparent and transmits image light. The illustrated cover layer 36 covers the decorative layer 30 and also fills the hole 22. In the example in Figure 6B, the transparent portion 30B is formed by the cover layer 36 inside the hole 22. This cover layer 36 protects the decorative portion 30A and can prevent foreign matter such as dust from entering the hole 22.

[0070] The cover layer 36 is preferably formed from a material with a small refractive index difference from the substrate 25. By reducing the refractive index difference between the cover layer 36 and the substrate 25, refraction at the interface between the cover layer 36 and the substrate 25 can be suppressed. This suppresses distortion of the image displayed by the display device 10. As an example, a resin material having a refractive index of 1.33 to 1.77 can be used for the cover layer 36. In this example, an acrylic resin having a refractive index of 1.53 to 1.57 can be used for the substrate 25. Examples of materials for the cover layer 36 include polymethyl methacrylate resin, fluororesin, silicone resin, polypropylene, urethane resin, polyethylene, nylon, polyvinyl chloride, epoxy, polycarbonate, and polystyrene.

[0071] As shown in Figure 6C, the decorative layer 30 may be positioned between the substrate 25 and the display device 10 in the third direction D3. In the decorative sheet 20 shown in Figure 6C, the design layer 32 and the light-shielding layer 34 are formed on the substrate 25 in this order. The decorative sheet 20 shown in Figure 6C further has a cover layer 36 that covers the decorative layer 30 from the surface adjacent to the display device 10. However, the cover layer 36 can be omitted from the decorative sheet 20 shown in Figure 6C.

[0072] Figure 7 is a partial plan view showing the decorative sheet 20. As shown in Figure 7, the decorative sheet 20 in plan view can be divided into a decorative portion 30A and a transparent portion 30B. In the illustrated example, the position, shape, and area of ​​the hole 22 determine the position, shape, and area of ​​the transparent portion 30B, respectively. The shape of the hole 22 in plan view is not particularly limited. For example, examples of the shape of the hole 22 in plan view include circular shapes, elliptical shapes and other shapes with curved contours, polygonal shapes such as triangular shapes, quadrilateral shapes, pentagonal shapes, hexagonal shapes, and octagonal shapes, and polygonal shapes with chamfered corners. However, in order to ensure the isotropy of the optical properties, the shape of the hole in plan view is preferably circular. In the example shown in Figure 7, the shape of the hole 22 in plan view is circular.

[0073] The ratio of the area occupied by the holes 22 to the area of ​​the decorative layer 30 in a plan view is defined as the aperture ratio of the decorative layer 30. The contour of the holes 22 in a plan view is identified as the contour of the portion that allows visible light transmission and contributes to the observation of the image. The contour of the holes 22 formed as through holes is the contour of the portion that penetrates the decorative layer 30 in projection toward the third direction D3. The area of ​​each hole 22 formed as a through hole is the area of ​​the portion that penetrates the decorative layer 30 in projection toward the third direction D3. That is, the area of ​​each hole 22 is the area of ​​the region that penetrates the decorative layer 30 over the entire thickness in the third direction D3, and where light traveling toward the third direction D3 can pass through the decorative layer 30 without being incident on the decorative portion 30A. The area of ​​each hole 22 defined in this way is the region that enables observation of the display device when observed from the third direction D3. The aperture ratio is determined using a digital microscope VHX-6000 manufactured by Keyence Corporation. Specifically, with light shining from the back side, an image is taken in transmission mode, and the areas through which light passes are identified as holes. If the holes are arranged in a circular or near-circular shape with a certain periodicity, the aperture ratio can be determined using the average diameter of the circles and the period of the holes.

[0074] The lower limit of the aperture ratio of the decorative layer 30 is preferably determined so that the image can be observed clearly when the display device 10 is displaying an image. The aperture ratio of the decorative layer 30 is preferably 5% or more, more preferably 10% or more, and even more preferably 15% or more. The upper limit of the aperture ratio of the decorative layer 30 is preferably determined so that the design of the decorative layer 30 can be observed clearly when the display device 10 is not displaying an image. The aperture ratio of the decorative layer 30 is preferably 50% or less, more preferably 45% or less, and even more preferably 40% or less.

[0075] The lower limit of the total light transmittance of the decorative sheet is preferably determined so that the image can be observed clearly when the display device 10 is displaying an image. The total light transmittance of the decorative sheet is preferably 3% or more, more preferably 5% or more, and even more preferably 10% or more. The upper limit of the total light transmittance of the decorative sheet is preferably determined so that the design of the decorative layer 30 can be observed clearly when the display device 10 is not displaying an image. The total light transmittance of the decorative sheet is preferably 40% or less, more preferably 35% or less, and even more preferably 30% or less. The total light transmittance of the decorative sheet can be set to a preferred range by appropriately setting the diameter and pitch of the holes and the transmittance of the base material 25. The total light transmittance of the decorative sheet shall be the value measured using a haze meter HM-150N (Murakami Color Technology Research Institute Co., Ltd.) in accordance with JIS K 7136:2000.

[0076] In this embodiment, the holes 22 are arranged in multiple arrangement directions. The arrangement pitch P of the holes 22 arranged in the first arrangement direction DA1. A1 The average value is A A1 (μm) The arrangement pitch P of the holes 22 arranged in the first arrangement direction DA1 A1 The standard deviation of σ A1 (μm) The arrangement pitch P of the holes 22 arranged in the second arrangement direction DA2. A2 The average value is A A2 (μm) The arrangement pitch P of the holes 22 arranged in the second arrangement direction DA2 A2 The standard deviation of σ A2 (μm) The first alignment direction DA1 is the direction in which the average value of the alignment pitch in that direction is smallest among the multiple alignment directions of the holes 22. The second alignment direction DA2 is the direction in which the average value of the alignment pitch in that direction is the second smallest among the multiple alignment directions of the holes 22. In this embodiment, the following conditions (A) to (F) are satisfied. 40≦A A1 ≤400 ···(A) 40≦A A2 ≤400 ···(B) 3 × σ A1 ≤20 ···(C) 3 × σA2 ≤20 ···(D) 0.0060≦σ A1 / A A1 ...(E) 0.0060≦σ A2 / A A2 ...(F)

[0077] The following describes the arrangement pitch P of multiple holes 22 arranged in the first arrangement direction DA1. A1 "First array pitch P A1 This is called the first array pitch P. A1 Average value A A1 "1st pitch average value A" A1 It is called "the first array pitch P A1 Standard deviation σ A1 The first pitch standard deviation σ A1 This is called ". Similarly, the arrangement pitch P of the multiple holes 22 arranged in the second arrangement direction DA2 A2 "Second array pitch P A2 It is called "the second array pitch P A2 Average value A A2 "2nd pitch average value A" A2 It is called " and the second array pitch P A2 Standard deviation σ A2 The second pitch standard deviation σ A2 They call it that.

[0078] Under conditions (A) and (B), the first pitch average value A is... A1 and the second pitch average value A A2 It specifies the upper and lower limits. 1st pitch average value A A1 and the second pitch average value A A2 The lower limit is determined such that the design of the decorative layer 30 can be observed clearly when the display device 10 is not displaying an image, and the image can be observed clearly when the display device 10 is displaying an image. First pitch average value A A1 and the second pitch average value A A2 The upper limit is determined so that the image can be observed clearly when the display device 10 is displaying the image. Second pitch average value A A2 This is the first pitch average value A A1It is preferably at most twice, more preferably at most 1.5 times, the first pitch average value A A1 and the second pitch average value A A2 The upper limit is more preferably 300 μm or less, still more preferably 200 μm or less.

[0079] The first pitch average value A A1 is preferably smaller than the pixel pitch of the display device 10 along the first array direction DA1. By setting the first pitch average value A A1 in this way with respect to the pixel pitch, light from all the pixels arranged in the first array direction DA1 passes through any one of the holes 22. The first pitch average value A A1 is preferably within the range of 60% or more and 90% or less with respect to the pixel pitch of the display device 10 along the first array direction DA1. By setting the first pitch average value A A1 within this range with respect to the pixel pitch, moiré caused by the pixel arrangement and the hole 22 arrangement can be made less noticeable.

[0080] The second pitch average value A A2 is preferably smaller than the pixel pitch of the display device 10 along the second array direction DA2. By setting the second pitch average value A A2 in this way with respect to the pixel pitch, light from all the pixels arranged in the second array direction DA2 passes through any one of the holes 22. The second pitch average value A A2 is preferably within the range of 60% or more and 90% or less with respect to the pixel pitch of the display device 10 along the second array direction DA2. By setting the second pitch average value A A2 within this range with respect to the pixel pitch, moiré caused by the pixel arrangement and the hole 22 arrangement can be made less noticeable.

[0081] In conditions (C) and (D), the upper limits of the first pitch standard deviation σ A1 and the second pitch standard deviation σ A2 are defined respectively. The first pitch standard deviation σ A1 and the second pitch standard deviation σ A2The upper limit is determined so as to sufficiently suppress the unevenness of the design displayed when the display device 10 is not displaying an image. First pitch standard deviation σ A1 and the second pitch standard deviation σ A2 Three times the value (3 × σ) A1 , 3 × σ A2 The upper limit of ) is more preferably 10 μm or less, even more preferably 7 μm or less, and even more preferably 5 μm or less.

[0082] First pitch standard deviation σ A1 and the second pitch standard deviation σ A2 The lower limit can be determined such that the occurrence of stripes can be sufficiently suppressed when the display device 10 is displaying an image. For example, the first pitch standard deviation σ A1 and the second pitch standard deviation σ A2 The lower limit is 3 times (3 × σ) A1 , 3 × σ A2 ) is preferably 1.0 μm or more, more preferably 2.0 μm or more, and even more preferably 3.0 μm or more. However, after diligent research by the inventors of this invention, the striped pattern has a first pitch standard deviation σ A1 and the second pitch standard deviation σ A2 The parameters defined by conditions (E) and (F) showed a stronger correlation than those defined by the parameters

[0083] Under conditions (E) and (F), the first pitch standard deviation σ is... A1 Average value A of the first pitch A1 The ratio value to and the second pitch standard deviation σ A2 The average value of the second pitch A A2 This specifies the lower limit of the ratio value for σ. The ratio value "σ" specified by condition (E) A1 / A A1 " and the value of the ratio specified by condition (F) "σ A2 / A A2 The lower limit of "σ" is determined so that the occurrence of stripes can be sufficiently suppressed when the display device 10 is displaying an image. The value of these ratios "σ" A1 / A A1" and the ratio value "σ A2 / A A2 The lower limit of " is more preferably 0.0080 or higher, and even more preferably 0.020 or higher.

[0084] These ratio values ​​"σ A1 / A A1 " and the ratio value "σ A2 / A A2 The upper limit of "σ" can be determined so as to sufficiently suppress the unevenness of the design displayed when the display device 10 is not displaying an image. For example, the ratio value "σ" A1 / A A1 " and the ratio value "σ A2 / A A2 The upper limit of " is preferably 0.070 or less, more preferably 0.040 or less, and even more preferably 0.020 or less. However, after careful consideration by the inventors, it was found that the unevenness of the design is due to the ratio value "σ A1 / A A1 " and the ratio value "σ A2 / A A2 Rather than ", the "3σ" of conditions (C) and (D) A1 " and "3σ A2 The latter showed a stronger correlation. Therefore, setting conditions (C) and (D) is effective in suppressing inconsistencies.

[0085] In order to determine conditions (A) to (F), it is necessary to identify the alignment direction of the holes 22. The alignment direction of the holes 22 is determined by observing the decorative sheet 20 in an area containing approximately 30 to 500 holes 22, for example, by using a microscope and magnifying it to 100 to 1000 times. In the example schematically shown in Figure 7, the holes 22 are arranged along the first alignment direction DA1, the second alignment direction DA2, and the third alignment direction DA3, respectively. In the example shown in Figure 7, the first alignment direction DA1, the second alignment direction DA2, and the third alignment direction DA3 are inclined at approximately 60° relative to each other.

[0086] If conditions (C) and (D) are met, the arrangement direction of the holes 22 can usually be determined by observing the decorative sheet 20 in a range containing approximately 30 to 500 holes 22 after magnifying it 100 to 1000 times. Alternatively, the arrangement direction may be determined as follows: First, in the magnified observation of the decorative sheet 20, a first reference hole is set located approximately in the center of the observation range, and the direction connecting the first reference hole and the second reference hole observed to be closest to it is defined as the arrangement direction. In the magnified observation of the decorative sheet, the direction connecting one or more holes other than the second reference hole located around the first reference hole and the first reference hole is also defined as the arrangement direction. In this case, as one or more holes, approximately 2 to 4 points can be selected from the second reference hole and the next nearest holes in the same arrangement direction, using the first reference hole as a reference, and the direction in which the pitch is smallest can be defined as the arrangement direction.

[0087] The arrangement pitch of holes 22 arranged along a specific arrangement direction refers to the distance between the centers of two adjacent holes 22 in that particular arrangement direction. The center of a hole 22 is the centroid of the hole 22 in plan view. For holes 22 that are circular in plan view as shown in Figure 7, the distance between the centers of the circles is the arrangement pitch.

[0088] Furthermore, if the plan view shape of the hole 22 is a circle or approximately a circle, the center of the circle formed by the hole 22 is determined as follows. First, three points located on the outer contour of the hole 22 that are judged to be separated from each other by a central angle of approximately 120° are identified. These three points may be identified manually by the measurer or automatically by the measuring device. Next, a circle passing through the identified three points is determined, for example, by image processing. The center of the determined circle is treated as the center of the hole 22. A digital microscope VHX-6000 manufactured by Keyence Corporation is used to identify such a circle.

[0089] Furthermore, in determining the center of the hole 22 and measuring the arrangement pitch of the holes 22, the shape of each hole 22 as a through hole is determined as the portion that penetrates the decorative layer 30 in projection toward the third direction D3, similar to the determination of the aperture ratio described above. When determining the aperture ratio as described above, the area of ​​the circular hole 22 is determined after determining the center and diameter of the circle as explained here.

[0090] The mean value and standard deviation of the arrangement pitch of holes 22 are determined based on a finite number of arrangement pitch measurements for two adjacent holes 22 in a specific arrangement direction of arbitrary choice. Specifically, the mean value of the arrangement pitch A is determined based on 30 arrangement pitch measurements for holes 22 arranged in a specific arrangement direction. A1 ,A A2 and the standard deviation of the array pitch σ A1 ,σ A2 The conditions are identified. When determining whether conditions (G) and (H), described later, are satisfied, the measurement points will be 30, just as when determining whether conditions (A) to (F) are satisfied.

[0091] For each arrangement direction, the average value of the arrangement pitch of the arranged holes 22 is determined, thereby identifying the first arrangement direction DA1 with the shortest average arrangement pitch and the second arrangement direction DA2 with the second shortest average arrangement pitch. Figure 7 shows the first arrangement direction DA1 with the shortest average arrangement pitch, the second arrangement direction DA2 with the second shortest average arrangement pitch, and the third arrangement direction DA3 with the third shortest average arrangement pitch. Typically, the angle between the first arrangement direction DA1 and the second arrangement direction DA2 is 45° or more, and tends to be 60° or more. From the viewpoint of preventing uneven distribution of holes in the planar area, it is preferable that the angle between the first arrangement direction DA1 and the second arrangement direction DA2 be between 60° and 90°.

[0092] In the example shown in Figure 7, the first to third array directions DA1, DA2, and DA3 are all inclined with respect to the first direction D1 and the second direction D2. In the illustrated example, the first pixel array direction DP1, which is the array direction of pixels in the display device 10, is parallel to the first direction D1 (see Figure 5). Similarly, the second pixel array direction DP2, which is the array direction of pixels in the display device 10, is parallel to the second direction D2. That is, in the example shown in Figure 7, the first to third array directions DA1, DA2, and DA3 with respect to the holes 22 are inclined with respect to the pixel array directions DP1 and DP2 with respect to the pixels. By inclining the array directions of pixels 16A, 16B, and 16C with respect to the array direction of holes 22, the occurrence of striped patterns can be suppressed.

[0093] Next, an example of a manufacturing method for the decorative sheet 20 having the above configuration will be described.

[0094] First, a film material 25A (see Figure 8) is prepared to form the base material 25. As the film material 25A, a transparent resin film material used for the base material 25 described above can be used. A base decorative layer 30C is formed on this film material 25A to form the decorative layer 30. In the specific example described above, the decorative layer 30 includes a design layer 32 and a light-shielding layer 34. When manufacturing this decorative sheet 20, as will be explained below, the base decorative layer 30C may include a base design layer 32A used to form the design layer 32 and a base light-shielding layer 34A used to form the light-shielding layer 34.

[0095] First, an ink that will form a light-shielding layer 34 is applied to the film material 25A. Next, the ink on the film material 25A is dried and solidified. As a result, a base light-shielding layer 34A is formed on the film material 25A. Unlike the light-shielding layer 34, the resulting base light-shielding layer 34A does not have holes 22 formed in it. A coating device such as a printing press is used to form the base light-shielding layer 34A.

[0096] Subsequently, a base design layer 32A is formed on the base light-shielding layer 34A by printing, transfer, or other means. Unlike the design layer 32, the base design layer 32A is formed as a layer without holes 22. Through the above procedure, as shown in Figure 8, a laminate 31 is obtained by laminating the base light-shielding layer 34A and the base design layer 32A on the film material 25A in this order. A coating device such as a printing press or a transfer device is used to form the base design layer 32A.

[0097] Next, holes 22 are formed in the base decorative layer 30C. The illustrated base decorative layer 30C includes a base design layer 32A and a base light-shielding layer 34A. In this example, holes 22 may be formed in the base design layer 32A and the base light-shielding layer 34A. As an example, as shown in Figure 9, holes 22 can be formed by irradiating the laminate 31 at the location where holes 22 are to be formed with laser light, and removing the base design layer 32A and the base light-shielding layer 34A in the irradiated area. As shown in Figure 9, laser light may be irradiated onto the surface of the laminate 31 adjacent to the film material 25A. The laser light that has passed through the film material 25A is irradiated onto the base decorative layer 30C. The laser light passes through the film material 25A and is efficiently absorbed by the base light-shielding layer 34A. As a result, the base light-shielding layer 34A melts and evaporates together with the adjacent base design layer 32A. Holes 22 are formed by the irradiation of laser light. A design layer 32 is obtained from a base design layer 32A in which holes 22 are formed. A light-shielding layer 34 is obtained from a base light-shielding layer 34A in which holes 22 are formed. In this way, a decorative sheet 20 having a decorative layer 30 on a substrate 25 made of film material 25A is obtained.

[0098] The laser light absorption rate of the film material 25A and the substrate 25 obtained from the film material 25A may be smaller than the laser light absorption rate of the base decorative layer 30C and the decorative layer 30 obtained from the base decorative layer 30C. In the illustrated example, the laser light absorption rate of the film material 25A and the substrate 25 obtained from the film material 25A may be smaller than the laser light absorption rate of the base light-shielding layer 34A and the light-shielding layer 34 obtained from the base light-shielding layer 34A. The laser light absorption rate of the base decorative layer 30C and the decorative layer 30 obtained from the base decorative layer 30C may be 3% or more, 5% or more, or 10% or more. The laser light absorption rate of the base light-shielding layer 34A and the light-shielding layer 34 obtained from the base light-shielding layer 34A may be 3% or more, 5% or more, or 10% or more. According to these examples, holes 22 can be formed efficiently and stably by irradiating the base decorative layer 30C with laser light transmitted through the film material 25A.

[0099] In the illustrated example, the decorative layer 30 has a design layer 32 and a light-shielding layer 34. The light-shielding layer 34 is located between the design layer 32 and the substrate 25. The light-shielding layer 34 is in contact with the substrate 25. The base decorative layer 30C has a base design layer 32A and a base light-shielding layer 34A. The base light-shielding layer 34A is located between the base design layer 32A and the film material 25A. The base light-shielding layer 34A is in contact with the film material 25A. According to this example, holes 22 can be efficiently and stably formed in the base decorative layer 30C by laser light transmitted through the film material 25A.

[0100] As shown in Figure 12, the decorative layer 30 obtained from the base decorative layer 30C by irradiating the film material 25A with laser light has a width along the alignment direction of the holes 22 (for example, the first alignment direction DA1 or the second alignment direction DA2) that is narrower at the base end 22A, which is closer to the substrate 25 along the third direction D3, than at the tip end 22B, which is further away from the substrate 25 along the third direction D3. As shown in Figure 17, the width of the holes 22 in the light-shielding layer 34 may be narrower than the width of the holes 22 in the design layer 32. The width along the alignment direction of the holes 22 (for example, the first alignment direction DA1 or the second alignment direction DA2) may be gradually narrowed from the tip end 22B, which is further away from the substrate 25 along the third direction D3, towards the base end 22A, which is closer to the substrate 25 along the third direction D3. In such examples, the decorative layer 30, for example, the light-shielding layer 34, can easily absorb the ambient light that enters the holes 22. This allows images and designs to be displayed with high contrast.

[0101] Considering production efficiency, it is preferable to produce a long laminate 31 and form holes 22 by irradiating the long laminate 31 with laser light. That is, it is preferable in terms of production efficiency to produce a long sheet article 50 including the decorative layer 30 and the base material 25 using a so-called roll-to-roll method, as shown in Figure 10. The sheet article 50 shown in Figure 10 is a sheet-like member that extends elongated in the longitudinal direction LD. The sheet article 50 can be wound around a winding axis RA that is not parallel to the longitudinal direction LD and treated as a winding body 50R. In the illustrated example, the winding axis RA is perpendicular to the longitudinal direction LD. Decorative sheets 20 are obtained by unwinding the sheet article 50 from the winding body 50R and cutting the unwinded sheet article 50. That is, individual decorative sheets 20 are obtained by cutting the decorative sheets 20, which are connected to other parts of the sheet article 50 without seams, from the sheet article 50.

[0102] Considering the yield of the sheet articles 50, it is preferable to cut the sheet articles 50 along a cutting line CL that is perpendicular to the longitudinal direction LD and along the width direction WD. It is also conceivable that the vicinity of the pair of width-direction edges 51 extending in the longitudinal direction of the sheet articles 50 may be damaged during handling such as storage and transportation of the sheet articles 50 or the winding body 50R. Therefore, as shown in Figure 10, each decorative sheet 20 may be cut out from the sheet article 50 so that the decorative sheet 20 does not include the width-direction edges 51. In the example shown in Figure 10, the long sides of the decorative sheet 20, the first edge 20a and the second edge 20b, are parallel to the longitudinal direction LD of the sheet article 50. The short sides of the decorative sheet 20, the third edge 20c and the fourth edge 20d, are parallel to the width direction WD of the sheet article 50. The method of cutting out the decorative sheets 20 from the sheet article 50 shown in Figure 10 can be expected to yield a high yield.

[0103] As shown in Figure 10, when taking multiple decorative sheets 20 from a sheet article 50, the laser irradiation device 100 shown in Figure 11 can be used. The laser irradiation device 100 shown in Figure 11 has multiple irradiation ports 100a. The multiple irradiation ports 100a are arranged in the arrangement direction DX. In the illustrated example, the spacing between the multiple irradiation ports 100a along the arrangement direction DX is constant. The laser irradiation device 100 of Figure 11 can simultaneously form multiple holes 22 in a facing laminate 31. By moving the laminate 31 relative to this laser irradiation device 100 and intermittently irradiating it with laser light from the irradiation ports 100a of the laser irradiation device 100, holes 22 can be formed in the laminate 31.

[0104] In the laser irradiation device 100 shown in Figure 11, laser light does not have to be emitted simultaneously from multiple irradiation ports 100a. The irradiation timing of the laser light from the multiple irradiation ports 100a may be different. Laser light may be irradiated sequentially from each of the multiple irradiation ports 100a with staggered timings. The irradiation ports 100a that emit laser light may change sequentially along the arrangement direction DX. That is, the irradiation ports 100a that emit laser light may change sequentially from an irradiation port 100a located on the first side in the arrangement direction DX to an irradiation port 100a located on the second side opposite to the first side. The laser light emission period may be the same, partially the same, or completely different between two or more irradiation ports 100a that are part of the multiple irradiation ports 100a.

[0105] In the manufacturing of the sheet article 50, the arrangement direction DX of the irradiation port 100a may be inclined with respect to both the width direction WD and the longitudinal direction LD of the laminate 31 that will form the sheet article 50. Furthermore, the laminate 31 may be moved relative to the laser irradiation device 100 not only in the longitudinal direction LD but also in the width direction WD. With these arrangements and transports, as shown in Figure 10, the holes 22 formed in the sheet article 50 can be arranged in arrangement directions DA1, DA2, and DA3 that are inclined with respect to both the longitudinal direction LD and the width direction WD of the sheet article 50. That is, in the decorative sheet 20 included in the sheet article 50, the first arrangement direction DA1 of the holes 22 may be inclined with respect to the longitudinal direction LD of the sheet article 50. In the decorative sheet 20 included in the sheet article 50, the second arrangement direction DA2 of the holes 22 may also be inclined with respect to the longitudinal direction LD of the sheet article 50. In other words, the first arrangement direction DA1 and the second arrangement direction DA2 can be neither perpendicular to the longitudinal direction LD nor parallel to the longitudinal direction LD. In the decorative sheet 20 contained in the winding body 50R, the first arrangement direction DA1 of the holes 22 may be inclined with respect to the winding axis RA of the winding body 50R. In the decorative sheet 20 contained in the winding body 50R, the second arrangement direction DA2 of the holes 22 may also be inclined with respect to the winding axis RA of the winding body 50R. When such a decorative sheet 20 is cut with a high yield from the winding body 50R or sheet article 50 as shown in Figure 10, it becomes easier to incline the first arrangement direction DA1 and the second arrangement direction DA2 with respect to the pixel arrangement directions DP1 and DP2 when combined with the display device 10 shown in Figure 5. Therefore, the resulting decorative sheet 20 can sufficiently suppress the occurrence of stripe patterns when combined with a general display device 10.

[0106] In the manufacturing of the decorative sheet 20 shown in Figure 6C, an ink that will form a cover layer 36 is applied to the prepared decorative layer 30. Next, the cover layer 36 can be created on the decorative layer 30 by drying and solidifying the ink applied to the decorative layer 30.

[0107] Incidentally, the decorative sheet 20 and sheet article 50 according to this embodiment satisfy the above-mentioned conditions (A) to (F). Furthermore, the decorative sheet 20 and sheet article 50 may also satisfy conditions (G) and (H) described later. On the other hand, conventional decorative sheets and sheet articles do not satisfy all of conditions (A) to (F). Conventional decorative sheets 20 and sheet article 50, in which holes are uniformly arranged, have little variation in the arrangement of holes, and conditions (E) and (F) are not satisfied. Also, conventional decorative sheets and sheet articles in which holes are irregularly arranged do not satisfy conditions (C) and (D). In decorative sheets and sheet articles with irregularly arranged holes, the variation in the arrangement of holes becomes too large in relation to conditions (C) and (D).

[0108] In response to this, the inventors of this case confirmed that they could stably produce decorative sheets 20 and sheet articles 50 that satisfy all of conditions (A) to (F) using the decorative sheet manufacturing apparatus 80 and laser irradiation apparatus 100 shown in Figures 11 and 13. Specifically, holes 22 are sequentially formed in the laminate 31 by moving the laminate 31 relative to the laser irradiation apparatus 100. At this time, the laminate 31 is moved relative to the laser irradiation apparatus 100 in a direction nonparallel to the arrangement direction DX of the irradiation port 100a, that is, in a direction inclined with respect to the arrangement direction DX or in a direction DM perpendicular to the arrangement direction DX, and laser light is intermittently emitted from the irradiation port 100a. In addition, at least one of the relative movement speed of the laminate 31 with respect to the laser irradiation apparatus 100 and the time interval in which laser light is emitted from the irradiation port 100a is varied.

[0109] By combining such fluctuations in relative movement speed and irradiation time intervals with a laser irradiation device 100 having multiple irradiation ports 100a arranged at regular intervals, it is possible to produce a decorative sheet 20 and a sheet article 50 that satisfy conditions (A) to (F), and even conditions (G) and (H). In order to satisfy conditions (A) to (F), and even conditions (G) and (H) for the decorative sheet 20, it is also effective to slightly stagger the spacing between the multiple irradiation ports 100a so that it is uneven.

[0110] Furthermore, variation in the irradiation time interval of laser light from the irradiation port 100a means that at least one of the time interval from the start of laser light irradiation from the irradiation port 100a to the start of the next laser light irradiation, and the time interval from the stop of laser light irradiation from the irradiation port 100a to the start of the next laser light irradiation, varies.

[0111] The variation in relative movement speed and the variation in irradiation time interval may be carried out in parallel, in parallel for only a portion of the period, or in completely separate periods. By carrying out the variation in relative movement speed and the variation in irradiation time interval in parallel, the regularity of the arrangement of the holes 22 can be weakened. This makes it easier to produce the decorated sheet 20 and sheet article 50 that satisfy conditions (A) to (F), and even conditions (G) and (H).

[0112] The laminate 31 may be moved relative to the laser irradiation device 100 in a direction inclined with respect to the arrangement direction DX of the irradiation port 100a, and laser light may be intermittently emitted from the irradiation port 100a. In this example, the regularity of the arrangement of the holes 22 can be weakened. This makes it easier to manufacture the decorated sheet 20 and sheet article 50 that satisfy conditions (A) to (F), and even conditions (G) and (H).

[0113] Furthermore, the arrangement pitch of the holes 22 in the direction parallel to the relative movement direction DM of the laminate 31 with respect to the laser irradiation device 100 may be different from the arrangement pitch of the irradiation port 100a. In this example as well, at least one of the first arrangement direction DA1 and the second arrangement direction DA2 is likely to be non-parallel to both the arrangement direction DX of the irradiation port 100a and the relative movement direction DM of the laminate 31 with respect to the laser irradiation device 100.

[0114] Furthermore, the arrangement pitch of the holes 22 in the direction parallel to the relative movement direction DM of the laminate 31 with respect to the laser irradiation device 100 may be greater than the arrangement pitch of the irradiation port 100a. In this example, both the first arrangement direction DA1 and the second arrangement direction DA2 are easily tilted with respect to the relative movement direction DM of the laminate 31 with respect to the laser irradiation device 100. In this example, the decorative sheet 20 cut with high yield as shown in Figure 10 is easily tilted with respect to the pixel arrangement directions DP1 and DP2 in the first arrangement direction DA1 and the second arrangement direction DA2 when combined with the display device 10 shown in Figure 5. Therefore, the resulting decorative sheet 20 can sufficiently suppress the occurrence of stripe patterns when combined with a general display device 10.

[0115] An example of a manufacturing apparatus for decorative sheets that forms holes by laser irradiation is a manufacturing apparatus for decorative sheets that includes, for example, a transport unit that transports a laminate including a film material and a base decorative layer on which a design is formed; a laser irradiation device having a plurality of irradiation ports that intermittently irradiates the laminate transported by the transport unit with laser light from the plurality of irradiation ports to form holes in the base decorative layer; and a control unit that controls the transport unit and the laser irradiation device, wherein the plurality of irradiation ports are arranged in a direction non-parallel to the relative movement direction of the laminate transported by the transport unit with respect to the laser irradiation device, and the control unit varies at least one of the relative movement speed of the laminate with respect to the laser irradiation device and the irradiation time interval of the laser light from the irradiation ports.

[0116] In the above, the laser irradiation device may be arranged so that the laser light transmitted through the film material is irradiated onto the base decorative layer.

[0117] Figure 13 shows an example of a decorative sheet manufacturing apparatus 80. The manufacturing apparatus 80 includes a transport unit 85, a laser irradiation device 100, and a control unit 90. The decorative sheet manufacturing apparatus 80 may also include a coating device and a transfer device for forming the base decorative layer 30C of the laminate 31.

[0118] The transport unit 85 transports the laminate 31, which includes the film material 25A and the base decorative layer 30C. The transport unit 85 may also include a drive roller 86 for winding up the laminate 31 and a driven roller 87 for unwinding the laminate. The transport unit 85 may transport the laminate 31 in a direction DM that is not parallel to the arrangement direction DX of the multiple irradiation ports 100a of the laser irradiation device 100, for example, in a direction inclined to the arrangement direction DX or in a direction DM perpendicular to the arrangement direction DX.

[0119] The control unit 90 may be electrically connected to the transport unit 85 and the laser irradiation device 100. The control unit 90 may control the transport unit 85 and the laser irradiation device 100. The transport unit 85 may vary the relative movement speed of the laminate 31 with respect to the laser irradiation device 100 through control from the control unit 90. The laser irradiation device 100 may vary the irradiation time interval of the laser light through control from the control unit 90.

[0120] The control unit 90 may be a computer having a processing unit such as a CPU (processor) and a storage unit such as RAM. The storage unit may store a computer program that defines the processing procedure of the manufacturing apparatus 80. The processing unit may realize the above-mentioned fluctuations in the relative movement speed of the stacked material and the fluctuations in the irradiation time interval of the laser light by executing the program stored in the storage unit.

[0121] Next, the operation of the decorative sheet-equipped display device 1 will be explained.

[0122] When the display device 10 is in a non-display state and the display surface 11 is not emitting light, the decorative sheet 20 covering the display surface 11 is visible, as shown in Figure 1. The decorative sheet 20 can conceal the display device, which is normally visible as black when it is not displaying light. In the decorative sheet 20 shown in Figure 6A, the design layer 32 of the decorative layer 30 is directly visible. In the decorative sheet 20 shown in Figure 6B, the design layer 32 of the decorative layer 30 is visible through the transparent cover layer 36. In the example shown in Figure 6C, the design layer 32 of the decorative layer 30 is visible through the transparent substrate 25. The design layer 32 forms an excellent design through the rich expressive power of printing, etc. The design expression of the decorative sheet 20 using the decorative layer 30 allows the display device 10 to be installed while ensuring harmony and unity with the surrounding environment. Recently, the range of applications for the display device 10 has been rapidly expanding. By using the decorative sheet 20, the display device 10 can be applied to the interior of automobiles, the interior of buildings, furniture, home appliances, etc., where design is important.

[0123] When the display device 10 is in the display state, image light is emitted from the display surface 11. The image light emitted from the display surface 11 passes through the base material 25 of the decorative sheet 20 and heads toward the decorative layer 30. The image light that enters the transparent portion 30B of the decorative layer 30 passes through the decorative layer 30 and is emitted from the decorative sheet 20 toward the observer. The image light that has passed through the decorative sheet 20 forms an image displayed on the display surface 11, as shown in Figure 4. In the example shown in Figure 4, the letter "D" is displayed.

[0124] Image light directed towards the decorative portion 30A of the decorative layer 30 is absorbed by the light-shielding layer 34, which is closer to the display device 10 than the design layer 32. In other words, image light from the display surface 11 does not pass through the decorative portion 30A. Therefore, image light does not illuminate the design layer 32 from the back side. This prevents the image displayed on the display surface 11 from mixing with the design formed on the decorative portion 30A of the decorative sheet 20. It also prevents the design of the design layer 32 from being conspicuous when an image is displayed on the display surface 11. As a result, when the display device 10 is in the display state, the image displayed on the display surface 11 can be clearly observed.

[0125] When the display device 10 was displaying an image, a striped pattern was sometimes observed on the decorative sheet 20. This striped pattern had no relation to the design displayed on the decorative sheet, nor to the image displayed on the display device. The striped pattern extended over a relatively large area of ​​several centimeters to more than ten centimeters. The striped pattern contained multiple lines arranged at a pitch observable to the naked eye. Each line extended linearly in a direction intersecting the direction of arrangement. The pattern of the striped pattern changed depending on the combination of the decorative sheet and the display device. The inventors diligently investigated this problem and hypothesized that the striped pattern was observed as a moiré pattern caused by interference between the regularity of the arrangement of holes 22 in the decorative layer 30 and the regularity of the arrangement of pixels in the display device 10. As a solution, by satisfying conditions (A) to (F) regarding the arrangement of holes 22, the occurrence of the striped pattern could be sufficiently suppressed, as demonstrated in the embodiments described later. 40≦A A1 ≤400 ···(A) 40≦A A2 ≤400 ···(B) 3 × σ A1 ≤20 ···(C) 3 × σ A2 ≤20 ···(D) 0.0060≦σ A1 / A A1 ...(E) 0.0060≦σ A2 / A A2 ...(F)

[0126] In this embodiment, the holes 22 are arranged in multiple directions. Conditions (A), (C), and (E) "A A1 "The arrangement pitch P of the holes 22 arranged in the first arrangement direction DA1, which has the smallest arrangement pitch of the holes 22 among multiple arrangement directions. A1 This is the average value (μm). A1 " is the arrangement pitch P of the holes 22 arranged in the first arrangement direction DA1. A1 Standard deviation σ P1 (μm). "A" in conditions (B), (D), and (F) A2"The arrangement pitch P of the holes 22 arranged in the second arrangement direction DA2, which is the second smallest arrangement direction among multiple arrangement directions. A2 This is the average value (μm). A2 " is the arrangement pitch P of the holes 22 arranged in the second arrangement direction DA2. A2 This is the standard deviation (μm).

[0127] The array pitch P defined in conditions (A) and (B) A1 ,P A2 Average value A A1 ,A A2 According to this, in combination with the preferred range of aperture ratio of the decorative layer 30 described above, the decorative sheet 20 effectively functions to suppress stripe patterns. That is, when the display device 10 is in the display state, the decorative sheet 20 transmits image light to the extent that the image can be observed. The observer can observe the image displayed on the display surface 11 through the decorative sheet 20. When the display device 10 is in the non-display state, the decorative sheet 20 hides the display surface 11. The observer can observe the design expressed by the decorative layer 30.

[0128] The array pitch P defined in conditions (A) and (B) A1 ,P A2 Average value A A1 ,A A2 If this is adopted, the arrangement pitch P of the holes 22 A1 ,P A2 In combination with the pixel array pitch of a typical display device 10, for example, an array pitch of 40 μm to 500 μm, a striped pattern may occur. As shown in Figures 3A to 3C, the pixel array pitch of a display device 10 that can be used in a mobile device, for example, 40 μm to 200 μm, and the pixel array pitch of a display device 10 that can be used in home appliances, furniture, etc., for example, an array pitch of 120 μm to 300 μm, and the array pitch P of the hole 22 A1 ,P A2 In combination with this, a striped pattern may occur.

[0129] Conditions (E) and (F) weaken the regularity of the arrangement of the holes 22. According to the provisions of conditions (E) and (F), the regularity of the arrangement of the holes 22 will be disrupted beyond the errors that occur in general manufacturing methods when forming holes at a constant pitch. As specified in conditions (E) and (F), "σ A1 / A A1 " and "σ A2 / A A2 If both values ​​of "" are 0.0060 or higher, the occurrence of striped patterns caused by the regularity of the arrangement of holes 22 and the regularity of the arrangement of the image can be sufficiently suppressed.

[0130] Furthermore, the "σ" specified in conditions (E) and (F) A1 / A A1 " and "σ A2 / A A2 It is more preferable that the values ​​of " are both 0.0080 or higher, and even more preferable that they be 0.020 or higher. As already mentioned, tilting the arrangement directions DA1 and DA2 of the holes 22 with respect to the arrangement directions DP1 and DP2 of the pixels is effective in suppressing the stripe pattern. A1 / A A1 " and "σ A2 / A A2 In the decorative sheet 20 in which both values ​​of "σ" were set to 0.0080 or higher, the occurrence of striped patterns could be suppressed by adjusting the arrangement directions DA1 and DA2 of the holes 22 with respect to the arrangement directions DP1 and DP2 of the pixels. Furthermore, "σ A1 / A A1 " and "σ A2 / A A2 With the decorative sheet 20 in which both values ​​of "" were set to 0.020 or higher, the stripe pattern could be sufficiently suppressed even when the arrangement directions DA1 and DA2 of the holes 22 were parallel to the arrangement directions DP1 and DP2 of the pixels.

[0131] Considering the intended use of the decorative sheet 20, the aperture ratio of the decorative sheet 20 is set to be very small. The occurrence of moiré patterns due to such a low aperture ratio in the decorative sheet 20 is therefore surprising. Furthermore, as a method for dealing with moiré patterns, the standard deviation σ A1 ,σ A2 Instead, the standard deviation σ A1 ,σ A2Average pitch A A1 ,A A2 The ratio values ​​are being adjusted. The discovery of such problems and the proposal of solutions are remarkable, exceeding what could be predicted from the current state of technology.

[0132] Conditions (E) and (F) weaken the regularity of the arrangement of the holes 22. If the arrangement of the holes 22 is irregular, inconsistencies will occur in the design displayed by the decorative layer 30 of the decorative sheet 20. Conditions (C) and (D) limit the degree to which the regularity of the arrangement of the holes 22 is weakened. As specified in conditions (C) and (D), "3 × σ A1 " and "3×σ A2 If both values ​​are 20 or less, the occurrence of design inconsistencies can be suppressed.

[0133] The arrangement of holes 22 in multiple alignment directions means that the holes 22 are arranged in two dimensions. When holes 22 are arranged in two dimensions, it can also be said that the holes 22 are arranged in three or more directions. For example, in the example shown in Figure 7, it can be said that the holes 22 are also arranged in directions parallel to the axis ALX and axis LAY. However, whether or not stripes or design irregularities occur is strongly influenced by the arrangement in the direction with the shorter alignment pitch. Therefore, in this embodiment, by adjusting the arrangement of holes 22 in the first alignment direction DA1 and the second alignment direction DA2, stripes and design irregularities can be sufficiently suppressed.

[0134] In addition to the conditions (A) to (F) regarding the arrangement of holes A described above, it is preferable that condition (G) is also satisfied. Condition (G) is the first pitch average value A A1 , 2nd pitch average value A A2 , 1st pitch standard deviation σ A1 and the second pitch standard deviation σ A2 These are the conditions related to this. |σ A1 / A A1 -σ A2 / A A2 |≦0.0010 ···(G) When condition G is met, adjusting the tilt angle of the pixels in the hole arrangement direction relative to the arrangement direction becomes more effective in suppressing the occurrence of striped patterns. Furthermore, when the upper limit (G) is met, the angular range of orientation of the decorative sheet 20 relative to the display device 10 that can suppress the occurrence of striped patterns, i.e., the range of tilt angles of the pixels in the hole arrangement direction relative to the arrangement direction, can be widened. A1 / A A1 -σ A2 / A A2 This effect was made more pronounced when the value of | was 0.00070 or less.

[0135] "|σ A1 / A A1 -σ A2 / A A2 There is no specific lower limit for "|" and it can be 0 or greater.

[0136] The opening area of ​​the holes 22 can be appropriately set within a range that satisfies the above-mentioned conditions for the opening ratio and the above-mentioned conditions for the arrangement pitch of the holes 22. However, if the area of ​​the holes 22 changes significantly, the transmittance of the decorative layer 30 will change locally. Therefore, the average value A of the diameter of the holes 22 D (μm) and the standard deviation σ of the diameter of hole 22 D It is preferable that (μm) satisfies the following condition (H). σ D / A D ≤0.080 ···Condition (H) Under condition (H), the standard deviation of the hole diameter is σ D1 Average value of hole diameter A D This specifies the upper limit of the ratio value. The upper limit of condition (H) is determined so as to sufficiently suppress variations in transmittance within the decorative sheet 20 surfaces and reduce unevenness in the brightness of the image displayed by the display device 10. In other words, condition (H) suppresses unevenness in the brightness of the image by limiting the magnitude of the variation in the area of ​​the holes 22. Ratio value "σ D / A D The upper limit of " is more preferably 0.050 μm or less, and even more preferably 0.030 or less. Standard deviation of hole diameter σ D1The smaller the value, the less likely it is that brightness unevenness will occur in the image, which is desirable. Therefore, the ratio value "σ D / A D The lower limit of the value is 0 or greater. The diameter of hole 22 is determined by identifying the circle that makes up hole 22 in the same way as the method for identifying the center of the circular hole 22 described above, and using the value of the diameter of the identified circle. That is, the identification of the circle and the identification of the circle's diameter are performed using a digital microscope VHX-6000 manufactured by Keyence Corporation.

[0137] In the embodiment described above, the decorative sheet 20 includes a decorative layer 30. The decorative layer 30 is provided with holes 22 arranged in multiple arrangement directions. The arrangement pitch P of the holes 22 arranged in the first arrangement direction DA1, which has the smallest average value of the arrangement pitch of the holes 22 among the multiple arrangement directions, is A1 Average value A A1 (μm) and standard deviation σ A1 (μm) and the arrangement pitch P of the holes 22 arranged in the second arrangement direction DA2, where the average value of the arrangement pitch of the holes 22 among multiple arrangement directions is the second smallest. A2 Average value A A2 (μm) and standard deviation σ A2 (μm) satisfies conditions (A) to (F). According to this embodiment, when observing the image displayed by the decorative sheet display device 1, the occurrence of striped patterns can be suppressed. 40≦A A1 ≤400 ···(A) 40≦A A2 ≤400 ···(B) 3 × σ A1 ≤20 ···(C) 3 × σ A2 ≤20 ···(D) 0.0060≦σ A1 / A A1 ...(E) 0.0060≦σ A2 / A A2 ...(F)

[0138] In one specific example of the above-described embodiment, the arrangement pitch P of the holes 22 arranged in the first arrangement direction DA1 A1 Average value AA1 (μm) and standard deviation σ A1 (μm) and the arrangement pitch P of the holes 22 arranged in the second arrangement direction DA2. A2 Average value A A2 (μm) and standard deviation σ A2 (μm) satisfies condition (G). According to this specific example, the angular range in which the occurrence of stripe patterns in the orientation of the decorative sheet 20 relative to the display device 10 can be suppressed can be widened. |σ A1 / A A1 -σ A2 / A A2 |≦0.0010 ···(G)

[0139] Furthermore, in one specific example of the above-described embodiment, the average value A of the diameter of the hole 22 D (μm) and the standard deviation σ of the diameter of hole 22 D (μm) satisfies the above-mentioned condition (H). According to this specific example, in-plane variation in the brightness of the image displayed on the decorative sheet 20 can be suppressed. σ D / A D ≤0.080 ···Condition (H)

[0140] Although one embodiment has been described with reference to the illustrated example, the illustrated example is not intended to limit the embodiment to that one embodiment. The above-described embodiment can be implemented in various other examples, and various omissions, substitutions, modifications, and additions can be made without departing from its essence.

[0141] An example of modification will be described below with reference to the drawings. In the following explanation and the drawings used therein, parts that can be configured in the same way as in the specific example described above will be given the same reference numerals as those used for the corresponding parts in the specific example described above, and redundant explanations will be omitted.

[0142] For example, in the specific example described above, the decorative layer 30 included the design layer 32 and the light-shielding layer 34. The decorative layer 30 may include only one of the design layer 32 and the light-shielding layer 34. The decorative layer 30 may include other layers in addition to the design layer 32 and the light-shielding layer 34.

[0143] In the examples shown in Figures 14A to 14C, the hole 22 was a through-hole penetrating the decorative layer 30. As shown in Figures 14A to 14C, the hole 22 extended along the entire length of the third direction D3 in the thickness direction of the decorative layer 30, in the illustrated example. That is, the hole 22 was a hole penetrating the decorative layer 30. As shown in Figures 14A to 14C, the hole 22 may extend along a portion of the third direction D3 in the thickness direction of the decorative layer 30, in the illustrated example. That is, the hole 22 may be a bottomed hole. The hole 22 is a portion that allows the transmission of image light. The image light transmitted through the hole 22 makes it possible to observe the image. The length of the hole 22 along the thickness direction should be sufficient to allow the observation of the image. The length of the hole 22 along the thickness direction, and the ratio of the length of the hole 22 along the thickness direction to the total thickness of the decorative layer 30, may be adjusted according to the visible light transmittance of the design layer 32, etc.

[0144] In the examples shown in Figures 14A to 14C, the decorative layer 30 includes a design layer 32 and a light-shielding layer 34. The hole 22 may extend only a portion of the thickness direction of at least one of the design layer 32 and the light-shielding layer 34. In the example shown in Figure 14A, the hole 22 penetrates the entire thickness of the design layer 32 and extends only a portion of the thickness of the light-shielding layer 34. In the examples shown in Figures 14B and 14C, the hole 22 is not provided in the design layer 32. In the examples shown in Figures 14B and 14C, a design layer 32 having sufficient visible light transmittance may be used. The visible light transmittance of the design layer 32 may be 5% or more, 10% or more, 15% or more, or 20% or more. In the example shown in Figure 14B, the hole 22 penetrates the light-shielding layer 34. In the example shown in Figure 14C, the hole 22 extends over only a portion of the thickness of the light-shielding layer 34.

[0145] As shown in the examples in Figures 15A to 15D, the design layer 32 and the light-shielding layer 34 may be separated in the direction D3 normal to the decorative layer 30. In this example, the hole 22 may extend over only a portion of the thickness of the design layer 32. In this example, the hole 22 may extend over only a portion of the thickness of the light-shielding layer 34. In the examples shown in Figures 15A and 15B, the hole 22 is formed in both the design layer 32 and the light-shielding layer 34. In the examples shown in Figures 15C and 15D, the hole 22 is not formed in the design layer 32, but only in the light-shielding layer 34. In the examples shown in Figures 15C and 15D, the hole 22 extends over only a portion of the thickness of the light-shielding layer 34.

[0146] In the examples shown in Figures 9 and 11, the film material 25A of the laminate 31 was located between the base decorative layer 30C of the laminate 31 and the irradiation port 100a of the laser irradiation device 100 in the lamination direction of the laminate 31, in the third direction D3 in the illustrated examples. The film material 25A was closer to the irradiation port 100a of the laser irradiation device 100 than to the base decorative layer 30C. In this example, laser light transmitted through the film material 25A is irradiated onto the base decorative layer 30C. The arrangement of the laser irradiation device 100 is not limited to the examples in Figures 9 and 11. As shown in Figure 16, the base decorative layer 30C of the laminate 31 may be located between the film material 25A of the laminate 31 and the irradiation port 100a of the laser irradiation device 100 in the lamination direction of the laminate 31, in the third direction D3 in the illustrated examples. The base decorative layer 30C may be closer to the irradiation port 100a of the laser irradiation device 100 than the film material 25A. The laser light from the laser irradiation device 100 may be irradiated onto the base decorative layer 30C without incident on the film material 25A.

[0147] In the specific example described above, the decorative sheet 20 included a base material 25 and a decorative layer 30. As shown in Figure 17, the decorative sheet 20 may also include one or more of the following as the decorative layer 30: wood, natural fibers, natural leather, natural stone, synthetic fibers, synthetic leather, and artificial stone. That is, the decorative layer 30 may include one or more of the following: wood, natural fibers, natural leather, natural stone, synthetic fibers, synthetic leather, and artificial stone. In the example shown in Figure 17, the decorative layer 30 of the decorative sheet 20 includes a thin sheet made of one of the following: wood, natural fibers, natural leather, natural stone, synthetic fibers, synthetic leather, and artificial stone. The decorative layer 30 is provided with holes 22, which can produce the effects described above. This decorative sheet 20 functions as a decorative material.

[0148] In the illustrated example, the display device 10 is shown to have multiple pixels 16A, 16B, and 16C for displaying different colors, but it is not limited to this example. The display device 10 may have only pixels for displaying a single color. Also, the pixel arrangement shown in Figure 5 is just one example, and various pixel arrangements can be used. [Examples]

[0149] The above-described embodiment will be explained in more detail below using examples, but the above-described embodiment is not limited to this example.

[0150] The decorative sheets according to Examples 1 to 7 and the decorative sheets according to Comparative Examples 1 to 4 were manufactured as follows.

[0151] <Comparative Example 1> A metallic decorative sheet was fabricated by patterning a chromium layer using a laser drawing method. A transparent quartz glass with a thickness of 2.3 mm was used as the substrate to support the chromium layer. The thickness of the chromium layer was 105 nm. Holes (holes penetrating the decorative layer) were formed in the chromium layer on the quartz glass using a laser drawing method. The arrangement of the holes was a so-called honeycomb arrangement. That is, holes were formed in three arrangement directions inclined at 60° to each other, with a constant arrangement pitch that was the same in each direction. The decorative sheet according to Comparative Example 1 was fabricated using the same manufacturing method and conditions as the photomask.

[0152] <Comparative Example 2> A decorative sheet with a black decorative layer was fabricated by patterning a positive-type black resist film using dry etching with photolithography technology. For pattern exposure of the positive-type black resist film, the decorative sheet fabricated in Comparative Example 1 was used as a mask after the evaluation described later was completed. A transparent acrylic film with a thickness of 75 μm was used as the substrate to support the resist film. The thickness of the resist film was 5 μm.

[0153] <Examples 1-7, Comparative Examples 3 and 4> Decorative sheets according to Examples 1-7 and Comparative Examples 3 and 4 were fabricated with reference to Figures 8-11. Specifically, the laminate was moved relative to a laser irradiation device, and laser light was sequentially irradiated onto the laminate to form holes, thereby fabricating the decorative sheets. The direction of relative movement of the laminate with respect to the laser irradiation device was inclined with respect to the arrangement direction of the irradiation ports of the laser irradiation device. That is, the relative movement direction was at an angle greater than 0° and less than 90° with respect to the arrangement direction of the irradiation ports. More specifically, the relative movement direction was at an angle of approximately 60° with respect to the arrangement direction of the irradiation ports. At least one of the relative movement speed of the laminate with respect to the laser irradiation device and the irradiation time interval of the laser light from the laser irradiation device was varied. By changing the degree of variation among the decorative sheets according to Examples 1-7 and Comparative Examples 3 and 4, the degree of variation in the holes in each decorative sheet was changed.

[0154] A transparent acrylic film with a thickness of 75 μm was used as the substrate supporting the decorative layer 30. The decorative layer had the same configuration as shown in Figure 6A. The decorative layer had a light-shielding layer and a design layer on the substrate 25 in that order. The total thickness of the light-shielding layer and the design layer was 5 μm.

[0155] <Measurements for each example> For each of the decorative sheets according to Examples 1-7 and Comparative Examples 1-4, the hole arrangement pitch P is determined in the first arrangement direction DA1 where the hole arrangement pitch is smallest. A1 Average value A A1 (μm) and standard deviation σ A1 (μm) was measured. These measurement results are shown in Table 1. Table 1 also shows the "3×σ" defined in the above conditions (C) and (E). A1 The value of (μm) and "σ A1 / A A1 The value of " is also listed.

[0156] [Table 1]

[0157] Similarly, for each of the decorative sheets according to Examples 1-7 and Comparative Examples 1-4, the hole arrangement pitch P is the second smallest hole arrangement pitch when the holes are arranged in the second arrangement direction DA2. A2 Average value A A2 (μm) and standard deviation σ A2 (μm) was measured. These measurement results are shown in Table 2. The "3×σ" defined in the above conditions (D) and (F) A2 The value of (μm) and "σ A2 / A A2 The values ​​for "[ ]" are also listed in Table 2. Furthermore, Table 2 also lists the angle θ(°) formed by the first array direction DA1 and the second array direction DA2.

[0158] [Table 2]

[0159] <Rating 1> The decorative sheets according to each example were placed on the display surface of a display device that was showing a full white display, and whether moiré patterns occurred was observed. The display device used was a commercially available 8-inch liquid crystal display with 1280 pixels horizontally and 720 pixels vertically (177 mm vertically, 99 mm horizontally, and a pixel pitch of 138 μm both vertically and horizontally). The same display device was used in Examples 1 to 7 and Comparative Examples 1 to 4. With the hole arrangement direction parallel to the pixel arrangement direction, the presence or absence of moiré patterns was evaluated. The evaluation results were described in the "Evaluation 1" column of Table 3. An "×" was marked when moiré patterns were observed to an unacceptable extent for a commercial product. An "AA" was marked when no moiré patterns were observed even when carefully observed at a viewing distance of 20 cm. An "A" was marked when moiré patterns were faintly observed but were acceptable when observed at a distance of 50 cm assuming use as a commercial product.

[0160] <Evaluation 2> The hole arrangement direction was adjusted with respect to the pixel arrangement direction, and the decorative sheet was positioned with respect to the display device in the direction where moiré patterns were least observed. Otherwise, the presence or absence of moiré patterns was evaluated in the same manner as in Evaluation 1. The evaluation results were described in the "Evaluation 2" column of Table 3. An "×" was marked when moiré patterns were observed to an unacceptable extent for a commercial product. An "AA" was marked when no moiré patterns were observed even when carefully observed at a viewing distance of 20 cm. An "A" was marked when moiré patterns were faintly observed but were acceptable when observed at a distance of 50 cm assuming use as a commercial product.

[0161] <Evaluation 3> With the display device in the non-display state, the decorative layer of the decorative sheet was observed from various directions to evaluate the presence or absence of unevenness in the color tone, texture, etc. of the decorative layer. The evaluation results were described in the column of "Evaluation 3" in Table 3. An "×" was marked when unevenness that was unacceptable for a commercial product was confirmed. An "AA" was marked when no unevenness was confirmed even when carefully observed at a viewing distance of 20 cm. An "A" was marked when unevenness was faintly observed but was acceptable when observed at a distance of 50 cm assuming use as a commercial product.

[0162] "3 × σ" A1 " and "3×σ A2 The larger of the two values ​​was entered in the "3 × σ" column of Table 3. A1 / A A1 " and "σ A2 / A A2 The smaller of the two values ​​was entered in the "σ / A" column of the table. A1 / A A1 -σ A2 / A A2 The value of "|" was entered in the "(G) Value" column of Table 3. Whether or not conditions (C) to (G) were met was entered in the "Condition" column of Table 3. If the condition was met, "OK" was entered in the condition column, and if the condition was not met, "NG" was entered in the condition column.

[0163] Furthermore, in the samples where the upper limit of condition (G) was met, the angular range of orientation of the decorative sheet relative to the display device that could suppress the occurrence of striped patterns was wide.

[0164] [Table 3]

[0165] <Rating 4> The decorative sheets for each example were placed on the display surface of the display device used in Evaluation 1, and the unevenness of brightness was evaluated. The display device was set to display all white. The evaluation results are recorded in the "Evaluation 4" column of Table 4. "×" is written when an unacceptable level of unevenness in brightness for a real product was observed. "AA" is written when no unevenness in brightness was observed at all, even upon careful observation. "A" is written when a slight unevenness in brightness was observed, but it was at an acceptable level for a real product.

[0166] For each of the decorative sheets according to Examples 1-7 and Comparative Examples 1-4, the average value of the hole diameter A D (μm) and standard deviation σ DThe (μm) measurement was performed. These measurement results are shown in Table 4. Whether or not condition (H) was met was indicated in the "Condition" column of Table 4. If the condition was met, "OK" was written in the condition column; if the condition was not met, "NG" was written in the condition column.

[0167] [Table 4]

[0168] <Rating 5> The decorative sheets for each example were placed on the display surface of the display device used in Evaluation 1, and the clarity of the displayed image was evaluated by observing the image displayed by the display device from various directions. The clarity of the display device was checked with various displayed images in the display state. The evaluation results are recorded in the "Evaluation 5" column of Table 5. "×" is written when the displayed image on the display device was observed to be too dark to be acceptable for a real product. "AA" is written when the displayed image was observed to be very clear. "A" is written when the displayed image was observed to be clear enough to be acceptable for a real product. "△" is written when the displayed image could be observed to be clear enough to be acceptable for a real product by adjusting the backlight of the liquid crystal display display device.

[0169] <Rating 6> With the display device turned off, the decorative layer of the decorative sheet was observed from various directions to evaluate the clarity of the design of the decorative layer. The evaluation results are recorded in the "Evaluation 6" column of Table 5. An "×" is written if the design was too unclear to be acceptable for a real product when observed from an observation distance of 50 cm. An "AA" is written if the design was clear even when carefully observed from an observation distance of 20 cm. An "A" is written if the design was clear enough to be acceptable for a real product when observed from an observation distance of 50 cm. An "A" is written if the design was unclear in part when observed from an observation distance of 50 cm.

[0170] For evaluations 5 and 6, the decorative sheets related to Reference Examples 1 to 4 were also included in the evaluation. Reference Examples 1 to 4 were manufactured in the same manner as Examples 1 to 7 and Comparative Examples 3 and 4. During the manufacturing of the decorative sheets related to Reference Examples 1 to 4, at least one of the relative movement speed of the laminate with respect to the laser irradiation device and the time interval of laser light irradiation from the laser irradiation device was varied. By changing the degree of variation among the decorative sheets related to Reference Examples 1 to 4, Examples 1 to 7, and Comparative Examples 3 and 4, the degree of hole variation in each decorative sheet was changed.

[0171] For each of the decorative sheets according to Examples 1-7, Comparative Examples 1-4, and Reference Examples 1-4, the total light transmittance (%) and aperture ratio (%) in the visible light range were measured using the measurement method described above. These measurement results are shown in Table 5.

[0172] [Table 5] [Explanation of Symbols]

[0173] 1: Display device with decorative sheet, 10: Display device, 12: Surface light source device, 20: Decorative sheet, 22: Hole, 25: Substrate, 25A: Film material, 30: Decorative layer, 30A: Decorative part, 30B: Transparent part, 31: Laminate, 32: Design layer, 32A: Base design layer, 34: Light-shielding layer, 34A: Base light-shielding layer, 50: Sheet article, 50R: Winding body, 51: Width direction edge, 80: Decorative sheet manufacturing device, 85: Conveying unit, 90: Control unit, 100: Laser irradiation device

Claims

[Claim 1] A step of producing a laminate including a base decorative layer on which a design is formed; and a step of intermittently irradiating the laminate with laser light from a laser irradiation device having a plurality of irradiation ports while moving the laminate relative to the laser irradiation device, thereby forming holes in the base decorative layer. A method for manufacturing a decorative sheet, wherein in the step of forming the holes, the laminate is moved relative to the laser irradiation device in a direction non-parallel to an arrangement direction of the plurality of irradiation ports.

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