JP2021167887A - Decorative sheet and display device with decorative sheet - Google Patents

Abstract

To provide a decorative sheet which can be manufactured within a short time at low cost.SOLUTION: A decorative sheet 20 comprises: a light-transmitting base material 21 having a first surface 21a facing one side and a second surface 21b facing the other side; and a light-shielding layer 51 and a design layer 23 sequentially laminated from the other surface to the one side. The design layer 23 has at least one element design layer 25. The light-shielding layer 51 and each element design layer 25 include a plurality of dots 53, 26 respectively having the same color.SELECTED DRAWING: Figure 1

Description

The present invention relates to a decorative sheet and a display device with a decorative sheet.

Conventionally, in a video display device such as a liquid crystal display device or an organic EL display device, the display surface is usually visually recognized as black when no video is displayed. Further, a light transmitting portion having a desired shape is formed, and the irradiation light from the backlight arranged on the back surface transmits the light transmitting portion, so that the light transmitting portion is distinguished from the surroundings, and a figure, a character, a pattern, etc. Even in the fixed display device visually recognized as, the display surface is visually recognized as black when the region other than the light transmitting portion has black color and the backlight does not emit light. When the area other than the light transmitting part of the fixed display device has a color other than black, the light transmitting part is distinguished from the surroundings and visually recognized as a figure or character even when the backlight is not emitting light. Can be done.

In various fields such as automobiles, furniture, and housing building materials, the design of members that can be seen by observers is regarded as important. In fields where such design is required, video display devices and fixed display devices are expected not only to have a function of displaying images, figures, characters, patterns, etc., but also to harmonize the design with the surrounding environment. Is also required. In order to impart a design that is in harmony with the surrounding environment to these display devices, it is conceivable to arrange a decorative sheet having a design that is in harmony with the surrounding environment on the observer side of the display surface of the display device. In the area of the decorative sheet facing the display surface of the display device, a large number of minute holes or the like are formed so that the images, figures, characters, patterns, etc. displayed on the display device can be visually recognized through the decorative sheet. A light transmitting portion is provided.

In Patent Document 1, a release layer portion of a fine pattern of a negative image is lifted off from a substrate, and a positive laminated fine pattern composed of a first colored layer, a concealing layer, and a second colored layer is formed on the substrate and lifted off. A decorative display panel having a see-through portion formed in a portion thereof is disclosed. Patent Document 2 describes a light-shielding material for windows provided with a fine halftone dot-like light-shielding portion having a desired shape formed by laminating a first colored layer, a base concealing layer, and a second colored layer on a transparent base material in this order. It is disclosed. Further, Patent Document 3 describes an instrument dial that illuminates from the back surface of the character substrate, and the character substrate has a light transmittance on the light transmitting plate in an overbright region where light source light is transmitted excessively brightly. A dial for an instrument is disclosed in which a first printing layer having a low value is formed, and a net dot printing layer is formed on the translucent plate including the upper surface of the first printing layer.

Japanese Unexamined Patent Publication No. 64-9777 Jikkenhei 2-112895 Japanese Unexamined Patent Publication No. 3-231118

As an example of a method for manufacturing such a decorative sheet, a design layer having a predetermined design is formed on a light-transmitting base material by printing or the like, and then a large number of fine particles serving as a light transmitting portion are formed on the design layer. It is conceivable to manufacture a decorative sheet having a design layer having a light transmitting portion by providing the holes by laser processing. However, in this method, since all the fine holes are formed by laser processing, there is a problem that it takes time to manufacture the decorative sheet and the processing cost also increases.

The present invention has been made in consideration of such a point, and an object of the present invention is to provide a decorative sheet and a display device with a decorative sheet that can be manufactured in a short time and at low cost.

The decorative sheet of the present invention
A base material having light transmission and having a first surface facing one side and a second surface facing the other side,
A light-shielding layer and a design layer laminated in order from the other side to the one side are provided.
The design layer has at least one elemental design layer.
The light-shielding layer and each element design layer include a plurality of halftone dots having the same color.

In the decorative sheet of the present invention
The halftone dots of each element design layer may be arranged on the one side of the halftone dots of the light-shielding layer.

In the decorative sheet of the present invention
A light reflecting layer including a plurality of halftone dots having the same color may be provided between the light-shielding layer and the design layer.

In the decorative sheet of the present invention
The halftone dots of the light reflecting layer are arranged on the one side of the halftone dots of the light shielding layer.
The halftone dots of each element design layer may be arranged on the one side of the halftone dots of the light reflection layer.

In the decorative sheet of the present invention
The sheet resistance may be 1 × 10 ⁶ Ω / □ or more.

The display device with a decorative sheet of the present invention
A display device with a display surface and
It has the above-mentioned decorative sheet provided facing the display surface.

In the display device with a decorative sheet of the present invention
The display device may be a dot matrix type display.

According to the present invention, it is possible to provide a decorative sheet and a display device with a decorative sheet that can be manufactured in a short time and at low cost.

FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a perspective view schematically showing a display device with a decorative sheet in which a decorative sheet is incorporated. FIG. 2 is a partial cross-sectional view showing a cross section of the decorative sheet. FIG. 3 is a partial plan view showing the first element design layer of the design layer of the decorative sheet. FIG. 4 is a partial plan view showing the second element design layer of the design layer of the decorative sheet. FIG. 5 is a partial plan view showing a third element design layer of the design layer of the decorative sheet. FIG. 6 is a partial plan view showing the fourth element design layer of the design layer of the decorative sheet. FIG. 7 is a partial plan view showing a design layer formed by superimposing each element design layer of FIGS. 3 to 6. FIG. 8 is a partial plan view showing a light-shielding layer of the decorative sheet. FIG. 9 is a partial plan view showing the light reflecting layer of the decorative sheet. FIG. 10 is a diagram for explaining a method of calculating the halftone dot ratio. FIG. 11 is a diagram for explaining a method of calculating the halftone dot ratio. FIG. 12 is a diagram for explaining an example of a method for adjusting the maximum halftone dot ratio. FIG. 13 is a diagram for explaining another example of the method of adjusting the maximum halftone dot ratio. FIG. 14 is a partial cross-sectional view schematically showing the state of reflection of light incident from the front surface of the decorative sheet when the black plate is arranged on the back side of the decorative sheet. FIG. 15 is a partial cross-sectional view schematically showing how the light emitted from the D65 light source passes through the decorative sheet. FIG. 16 is a partial cross-sectional view showing one step of an example of a method for manufacturing a decorative sheet. FIG. 17 is a partial cross-sectional view showing one step of an example of a method for manufacturing a decorative sheet. FIG. 18 is a partial cross-sectional view showing one step of an example of a method for manufacturing a decorative sheet. FIG. 19 is a partial cross-sectional view showing one step of an example of a method for manufacturing a decorative sheet. FIG. 20 is a partial cross-sectional view showing one step of an example of a method for manufacturing a decorative sheet. FIG. 21 is a partial cross-sectional view showing one step of an example of a method for manufacturing a decorative sheet. FIG. 22 is a partial cross-sectional view showing a modified example of the decorative sheet. FIG. 23 is a partial cross-sectional view showing another modified example of the decorative sheet.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, the aspect ratio, and the like are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension. The embodiments shown below are examples of the embodiments of the present invention, and the present invention should not be construed as being limited to these embodiments.

In the present specification, the terms "board", "sheet", and "film" are not distinguished from each other based solely on the difference in designation. For example, "sheet" is a concept that also includes members that can be called "plates" or "films".

Further, the "plate surface (sheet surface, film surface)" is a plate-like member (sheet-like) that is a target when the target plate-like (sheet-like, film-like) member is viewed as a whole and from a broad perspective. A surface that coincides with the direction in which the member (member, film-like member) extends. Further, the normal direction used for the plate-shaped (sheet-shaped, film-shaped) member refers to the direction in which the normal line extends with respect to the plate surface (sheet surface, film surface) of the member.

As used herein, the term "planar view" refers to a state in which symmetrical plate-shaped (sheet-shaped, film-shaped) members are viewed from the normal direction of the members. For example, when a plate-shaped member "has a rectangular shape in a plan view", the member has a rectangular shape when the member is viewed from the normal direction with respect to the plate surface. Means that.

In addition, as used herein, terms such as "parallel," "orthogonal," "identical," and lengths, angles, and physical properties that specify the shape, geometric conditions, and physical properties and their degree. Unless there is a statement that it should be interpreted strictly, it is interpreted that the value of is included in the range where the same function can be expected without being bound by its strict meaning. Should be.

In the following embodiment, a decorative sheet arranged and used on the observer side of the display surface of a video display device such as a liquid crystal display device or an organic EL display device will be described as an example. However, without being limited to such an application, the decorative sheet of the present invention may be used as a decorative sheet arranged and used on the observer side of the display surface of the fixed display device, or the like. It may be used for various purposes. In the fixed display device, for example, a light transmitting portion having a desired shape is formed on the observer side of the backlight, and the irradiation light from the backlight is transmitted through the light transmitting portion so that the light transmitting portion is transmitted from the surroundings. It is a display device that can be distinguished and visually recognized as a pattern such as a figure or a character.

1 to 23 are diagrams for explaining one embodiment according to the present invention. Of these, FIG. 1 is a perspective view schematically showing a display device 10 with a decorative sheet in which the decorative sheet 20 is incorporated, and FIG. 2 is a partial cross-sectional view showing a cross section of the decorative sheet 20.

The display device 10 with a decorative sheet of the present embodiment includes a display device 15 and a decorative sheet 20 arranged so as to face the display surface 17 of the display device 15. The display device 15 of the present embodiment is, for example, a dot matrix type display. Examples of the dot matrix type display include a liquid crystal display (LCD), an organic EL display (OLED), a micro LED display, and a quantum dot (QD) display. The display surface 17 includes a display area 17A on which an image such as a moving image or a still image is displayed, and a non-display area 17B on which the image is not displayed. In the example shown in FIG. 1, in the plan view of the display surface 17, the display area 17A has a rectangular contour, and the non-display area 17B has a frame shape surrounding the display area 17A. Decorative sheet equipped display device 10 has a light emitting surface 10a for emitting the image light L _i that may be visible to the observer 5 through the decorating sheet 20 is emitted from the display device 15. In the illustrated example, the decorative sheet 20 constitutes the light emitting surface 10a. Not limited to this, a transparent protective layer or the like may be further provided on the observer 5 side of the decorative sheet 20, and the protective layer or the like may form the light emitting surface 10a of the display device 10 with the decorative sheet.

The decorative sheet 20 is a member that is arranged on the observer 5 side of the display device 15 and is used to impart design to the display device 15. In particular, the decorative sheet 20 is used to impart a design property in harmony with the surrounding environment to the display device 15. In the example shown in FIG. 1, the decorative sheet 20 is arranged so as to cover the display area 17A and the non-display area 17B of the display surface 17. Not limited to this, the decorative sheet 20 may be arranged so as to cover only the display area 17A of the display surface 17. The decorative sheet 20 is given a predetermined design when observed from the observer 5 side, and when the image light _Li is not emitted from the display device 15, the design is visually recognized by the observer 5. NS. Further, the decorative sheet 20 includes a light transmitting portion 27 will be described later, the light transmitting portion 27 transmits the display device 15 side image light L _i emitted from the display device 15 to the observer 5 side .. Thus, when image light L _i is emitted from the display device 15, and exits through the light transmitting portion 27 of the image light L _i is the decorating sheet 20 from the exit surface 10a, is visible to the observer 5 NS. Therefore, the decorative sheet 20 functions so that the display device 10 with the decorative sheet has a different appearance to _{the observer 5 depending on whether the image light Li is emitted from the display device 15 or not.}

The decorative sheet 20 includes a light-transmitting base material 21, a light-shielding layer 51 laminated on the base material 21, and a design layer 23. The decorative sheet 20 has a first surface 20a facing the observer side (one side) and a second surface 20b facing the side opposite to the first surface 20a (the other side, the display device 15 side). .. In the illustrated example, the first surface 20a of the decorative sheet 20 forms the light emitting surface 10a of the display device 10 with the decorative sheet. In the example shown in FIG. 2, the light-shielding layer 51 and the design layer 23 are laminated in order from the other side to one side. Further, in the illustrated example, the decorative sheet 20 has a light-reflecting layer 55 arranged between the light-shielding layer 51 and the design layer 23, and a base material 21, a light-shielding layer 51, a light-reflecting layer 55, and a design layer 23. Further has a coating layer 28 that covers the surface from one side.

The base material 21 is a member that supports the design layer 23. The base material 21 has a first surface 21a facing the observer 5 side and a second surface 21b facing the side opposite to the first surface 21a (display device 15 side). In the example shown in FIG. 2, a light-shielding layer 51, a light-reflecting layer 55, and a design layer 23 are provided on the first surface 21a of the base material 21. In the illustrated example, so as not to interfere with passage of the image light L _i emitted from the display device 15, the substrate 21 is configured as a transparent substrate. Such a base material 21 preferably has a visible light transmittance of 80% or more, and more preferably 84% or more. In the present specification, the visible light transmittance is measured with a spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation, JIS K0115 compliant product) in the measurement wavelength range of 380 nm to 780 nm. It is specified as the average value of the transmittance at each wavelength.

Further, the base material 21 preferably has a light reflectance of 20% or less in the visible light region, and more preferably 16% or less. The light reflectance can be measured using a spectrophotometer "CM-700d" manufactured by Konica Minolta.

The base material 21 may be composed of, for example, a glass or resin plate, sheet or film. As the resin film, various resin films used as a base material of an optical member can be preferably used. As an example, acrylic resin, ABS resin, polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, cyclic polyolefin and the like can be used as the material of the base material 21. The base material 21 may be composed of one layer of resin film or may be composed of two or more layers of resin film. As an example, the thickness of the base material 21 can be 50 μm or more and 500 μm or less. In the illustrated example, the second surface 21b of the base material 21 constitutes the second surface 20b of the decorative sheet 20.

The design layer 23 has a function of displaying a design to be visually recognized by the observer 5 when the _{image light Li is not emitted from the display device 15.} Examples of this design include patterns such as pictures, photographs, figures, patterns, marks, characters, and colors. In particular, as a design that can be harmonized with the environment around the place where the display device 15 is installed, it is possible to use a wood grain or marble pattern. Further, the design layer 23 may display a pattern of a single color as a design.

The design layer 23 has at least one elemental design layer 25. One element design layer 25 displays a monochromatic element design. In the present embodiment, each element design layer 25 includes a plurality of halftone dots 26 having the same color. In each element design layer 25, the element design is represented by a set of halftone dots 26. When the design layer 23 includes a plurality of element design layers 25, each element design layer 25 displays element designs having different colors from each other. In this case, the design to be displayed by the design layer 23 is formed by overlapping the plurality of element design layers 25. In other words, each element design is a design in which the design to be displayed by the design layer 23 is decomposed for each color. The design layer 23 of the present embodiment includes four elemental design layers 25 (251 to 254). The first element design layer 251 displays a black (BK) element design, the second element design layer 252 displays a blue (C) element design, and the third element design layer 253 displays a red (M) element design. Is displayed, and the fourth element design layer 254 displays a yellow (Y) element design. That is, the first element design layer 251 is composed of a set of halftone dots 26 having black color, the second element design layer 252 is composed of a set of halftone dots 26 having blue color, and the third element design layer 253 has red color. The fourth element design layer 254 is composed of a set of halftone dots 26 having a yellow color. The specific configuration of the element design layer 25, that is, the number of the element design layers 25, the color displayed by each element design layer 25, the order in which the plurality of element design layers 25 are superposed, and the like can be arbitrarily determined. ..

FIG. 3 is a partial plan view showing the first element design layer 251 (25), FIG. 4 is a partial plan view showing the second element design layer 252 (25), and FIG. 5 is a third element design. It is a partial plan view which shows the layer 253 (25), and FIG. 6 is a partial plan view which shows the 4th element design layer 254 (25). In each element design layer 25, the halftone dots 26 are composed of fine dot-shaped colored regions. In the illustrated example, the halftone dots 26 have a circular contour shape in a plan view. The diameter of the halftone dots 26 can be, for example, 72 μm or more and 365 μm or less, preferably 72 μm or more and 270 μm or less. Within one element design layer 25, each halftone dot 26 can have the same or different areas (diameters) from each other. Such halftone dots 26 can be formed by using, for example, a printing technique such as screen printing or a photolithography technique.

The halftone dots 26 are arranged using, for example, an AM screen. When the AM screen is used, the plurality of halftone dots 26 are regularly arranged along a predetermined arrangement direction. In particular, the plurality of halftone dots 26 are arranged on each intersection of a predetermined virtual grid. In this case, the shade in the element design displayed by the element design layer 25 is represented by the size of the area (diameter) of the halftone dots 26. In the examples shown in FIGS. 3 to 7, each halftone dot 26 is regularly arranged using an AM screen. The resolution of the halftone dots 26 in the element design layer 25 can be, for example, 70 dpi or more and 150 dpi or less. As described above, the area (diameter) of the halftone dots 26 actually changes according to the shade in the element design displayed by the element design layer 25, but in FIGS. 3 to 7, each halftone is shown in FIGS. 3 to 7 in order to facilitate understanding. The points 26 are shown to have the same area (diameter) as each other.

When an AM screen is used for arranging the halftone dots 26, when a plurality of element design layers 25 are laminated by aligning the arrangement directions of the halftone dots 26, when a slight misalignment occurs between the element design layers 25, this is achieved. Moire due to misalignment can occur. Therefore, it is preferable to stack the plurality of element design layers 25 so that the arrangement directions of the halftone dots 26 among the plurality of element design layers 25 are different from each other. Figure 3 in the example shown in Figure 7, the arrangement direction _{D 1} of the dot 26 of the first element design layer 251 as a reference, the sequence of dot 26 of the second element design layer 252～ fourth element design layer 254 The first element design layers 251 to the fourth element design layers 254 are laminated so that the directions D _{2 to} D _{4 have a predetermined angle θ. In the illustrated example, the arrangement direction D 2} of the net points 26 of the second element design layer 252 has an angle θ of 15 degrees counterclockwise with respect to the arrangement direction D _{1, and the arrangement direction D 2 of the third element design layer 253.} The arrangement direction D ₃ of the net points 26 has an angle θ of 45 degrees counterclockwise with respect to the arrangement direction D _{1 , and the arrangement direction D 4} of the net points 26 of the fourth element design layer 254 is the arrangement direction D. _It has an angle θ of 75 degrees counterclockwise with respect to 1.

FIG. 7 shows a partial plan view of the design layer 23 formed by superimposing the first element design layer 251 to the fourth element design layer 254. In FIG. 7, the first element design layer 251 to the fourth element design layer 254 are overlapped in this order from the base material 21 side (display device 15 side), and viewed from the fourth element design layer 254 side (observer 5 side). It is a figure shown by. In the illustrated example, the _{element design layers 251 to 254 are arranged so that the arrangement directions D 1 to} D ₄ of the halftone dots 26 have a predetermined angle with each other. Therefore, between the element design layers 251 to 254. Even if a slight misalignment occurs, it is possible to prevent moire caused by this misalignment.

FIG. 8 is a partial plan view showing the light shielding layer 51. The light-shielding layer 51 is a layer that suppresses the light incident from the display device 15 side (other side) from being transmitted to the observer 5 side (one side). The light-shielding layer 51 absorbs or reflects at least a part of the light incident from the display device 15 side, thereby suppressing the light from being transmitted to the observer 5 side. The visible light transmittance of such a light-shielding layer 51 is preferably 1% or less, and more preferably 0.5% or less. The light-shielding layer 51 can be, for example, a layer colored in black or gray, or a layer having a large thickness to reduce the visible light transmittance. When the light-shielding layer 51 is a layer having a large thickness and thus having a reduced visible light transmittance, the light-shielding layer 51 may have any color. Such a light-shielding layer 51 can be formed on the base material 21 by using a printing technique such as screen printing or a photolithography technique.

The light-shielding layer 51 includes a plurality of halftone dots 53 having the same color. That is, the light-shielding layer 51 is composed of a set of a large number of halftone dots 53. In the present embodiment, the light-shielding layer 51 has a pattern corresponding to the pattern of the halftone dots 26 of the design layer 23. Specifically, the pattern of the light-shielding layer 51 corresponds to the pattern in which the halftone dots 26 of all the element design layers 25 are overlapped, as shown in FIG. Preferably, the light-shielding layer 51 has the same pattern as the pattern in which the halftone dots 26 of all the element design layers 25 are overlapped. As a result, the halftone dots 26 of each element design layer 25 are arranged on the observer 5 side (one side) of the corresponding halftone dots 53 of the light-shielding layer 51.

Since the decorative sheet 20 has such a light-shielding layer 51, the light incident on the decorative sheet 20 from the display device 15 side is incident on the design layer 23 (element design layer 25). Can be suppressed. Therefore, the light incident on the decorative sheet 20 from the display device 15 side is emitted from the design layer 23 to the observer 5 side by passing through the plurality of halftone dots 26 overlapping along the normal direction of the design layer 23. It is possible to effectively suppress the occurrence of color mixing in the light.

FIG. 9 is a partial plan view showing the light reflecting layer 55. The light reflecting layer 55 is a layer that reflects the light incident on the decorative sheet 20 from the observer 5 side toward the observer 5. The light reflectance of the light reflecting layer 55 is preferably 25% or more, and more preferably 30% or more. The light reflecting layer 55 can be, for example, a layer colored in white. Such a light reflecting layer 55 can be formed on the base material 21 by using a printing technique such as screen printing or a photolithography technique.

The light reflecting layer 55 includes a plurality of halftone dots 57 having the same color. That is, the light reflecting layer 55 is composed of a set of a large number of halftone dots 57. In the present embodiment, the light reflecting layer 55 has a pattern corresponding to the pattern of the halftone dots 53 of the light shielding layer 51 shown in FIG. Preferably, the light reflecting layer 55 has the same pattern as the pattern of the halftone dots 53 of the light shielding layer 51. As a result, the halftone dots 57 of the light reflecting layer 55 are arranged on the observer 5 side (one side) of the corresponding halftone dots 53 of the light shielding layer 51.

Further, in the present embodiment, the light reflecting layer 55 has a pattern corresponding to the pattern of the halftone dots 26 of the design layer 23. Specifically, the pattern of the light reflecting layer 55 corresponds to the pattern in which the halftone dots 26 of all the element design layers 25 are overlapped, as shown in FIG. Preferably, the light reflecting layer 55 has the same pattern as the pattern in which the halftone dots 26 of all the element design layers 25 are overlapped. As a result, the halftone dots 26 of each element design layer 25 are arranged on the observer 5 side (one side) of the corresponding halftone dots 57 of the light reflecting layer 55.

Since the decorative sheet 20 has such a light reflecting layer 55, the light reflected on the decorative sheet 20 from the observer 5 side and transmitted through the halftone dots 26 is reflected by the light reflecting layer 55. , The halftone dot 26 can be passed through and returned to the observer 5 side. Therefore, each halftone dot 26 can be satisfactorily colored, and the contrast of the design displayed by the design layer 23 when the _{image light Li is not emitted from the display device 15 can be effectively improved.}

With the above-described configuration, in the example shown in FIG. 2, the decorative sheet 20 has a light-shielding layer 51 and a light-reflecting layer 55 laminated on the first surface 21a of the base material 21 in order from the other side to one side. And has a design layer 23.

The coating layer 28 functions as a protective layer that covers and protects the base material 21, the light-shielding layer 51, the light-reflecting layer 55, and the design layer 23 from the observer 5 side. In the illustrated example, the surface of the covering layer 28 facing the observer 5 constitutes the first surface 20a of the decorative sheet 20. In the example shown in FIG. 2, so as not to interfere with passage of the image light L _i emitted from the display device 15, the coating layer 28 is configured as a transparent member. Such a coating layer 28 preferably has a visible light transmittance of 80% or more, and more preferably 84% or more. In the coating layer 28, a glass or resin film is attached or a fluid resin material is applied onto the base material 21 (first surface 21a), the light-shielding layer 51, the light-reflecting layer 55, and the design layer 23. It can be formed by curing it. As the resin material on which the coating layer 28 can be formed, various resin materials used as optical members can be preferably used. As an example, as the material of the coating layer 28, the same resin material as the resin material constituting the base material 21 can be used.

Next, the halftone dots 26, 53, 57 included in the element design layer 25, the light-shielding layer 51, and the light-reflecting layer 55 will be described in more detail. In the decorative sheet 20 of the present embodiment, the number X of the element design layers 25 included in the design layer 23 and the maximum halftone dot ratio Y (%) in each element design layer 25 (251 to 254) are as follows. Meet the relationship.
Y ≤ 95.7 x X ^(-0.243) ... (Equation 1)
Note that X is a natural number. For example, when the number X of the element design layers 25 included in the design layer 23 is 4, the maximum halftone dot ratio Y in each element design layer 25 is about 68.3% or less.

In the present specification, the halftone dot ratio of a certain layer (for example, the element design layer 25) is occupied by the portion of the halftone dots 26 located in the predetermined area of the layer in the plan view of the layer. Refers to the percentage of the area. The maximum halftone dot ratio is the largest halftone dot ratio among the halftone dot ratios in each region of the layer. Therefore, for example, when the maximum halftone dot ratio in the element design layer 25 is 60%, the halftone dot ratio is 60% or less in all the regions in the element design layer 25. In other words, when the maximum halftone dot ratio in the element design layer 25 is 60% or less, there is no region in the element design layer 25 in which the halftone dot ratio exceeds 60%.

As the number X of the elemental design layers 25 included in the design layer 23 increases, the coverage of the design layer 23 by the halftone dots 26 increases. As described later, when image light L _i is emitted from the display device 15, to ensure that the image light L _i is well visible from the observer 5, a plurality of elements the design layer 25 is superimposed The coverage of the design layer 23 after being formed by the halftone dots 26 is preferably 95% or less. In the present embodiment, as the number X of the element design layers 25 included in the design layer 23 increases, the maximum halftone dot ratio Y in one element design layer 25 decreases. In particular, when the number X of the element design layers 25 and the maximum halftone dot ratio Y in each element design layer 25 satisfy the above equation 1, the design layer 23 after the plurality of element design layers 25 are superposed. The coverage by the halftone dots 26 does not greatly exceed 95%. Therefore, a sufficient area of the light transmitting portion 27 in the design layer 23 can be secured.

Table 1 shows the decorative sheet 20 when the number X of the element design layers 25 included in the design layer 23 and the maximum halftone dot ratio Y in each element design layer 25 are changed for the plurality of samples of the decorative sheet 20. The following is a summary of the evaluations of. In Table 1, the "sample number" is a serial number assigned to each sample. The "number X of element design layers" is the number X of the element design layers 25 included in the design layer 23 of each sample. The "maximum halftone dot ratio Y (%)" is the maximum halftone dot ratio Y (%) in each element design layer 25. The “coverage (%)” is the coverage (%) of the halftone dots 26 in the design layer 23. The "transmittance (%)" is the visible light transmittance (%) of the light transmitted through each sample. "Evaluation" is an evaluation for each sample. Visually evaluate the visible light transmittance and the color reflectance of the decorative sheet 20 of the display device 10 with a decorative sheet (referred to simply as "display device" in Table 1) in which the decorative sheet 20 of each sample is incorporated. went.

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

According to the study by the present inventors, as shown in Table 1, two types of element design layers 25 having different colors and arrangements of halftone dots 26 and a maximum halftone dot ratio Y of 80% are superposed. in the case of forming the design layer 23 (X = 2), adjacent coverage of about 95% of the halftone dots 26 in the design layer 23, required to visually recognize the observer 5 image light L _i from the display device 15 The transmittance could be secured. Similarly, the element design layers 25 having maximum halftone dot ratios of 75%, 70%, 65%, and 60%, respectively, have 3 types (X = 3), 4 types (X = 4), and 5 types (X =), respectively. When 5) and 6 types (X = 6) were superposed, the coverage of the halftone dots 26 in the design layer 23 was about 95%. As a matter of course, when there is only one type of element design layer 25 (X = 1), the covering ratio is 95% when the maximum halftone dot ratio Y is 95%. The above equation 1 is obtained as an approximate equation based on these data.

An example of a method of calculating the halftone dot ratio in each element design layer 25 will be described. 10 and 11 are diagrams for explaining a method of calculating the halftone dot ratio. In particular, FIG. 10 is a diagram for explaining a method of calculating the halftone dot ratio when the arrangement pitch a of the halftone dots 26 is equal to or larger than the diameter b of the halftone dots 26, and FIG. 11 is a diagram for explaining the arrangement pitch of the halftone dots 26. It is a figure for demonstrating the calculation method of the halftone dot ratio when a is smaller than the diameter b of the halftone dot 26. Here, consider a unit section 50 having the centers of the four halftone dots 26 as vertices. As shown in FIGS. 10 and 11, the unit compartment 50 has a square contour having a side length of a. Therefore, the area of the unit section 50 is ^{a 2.}

In the example shown in FIG. 10, the area of the area covered by the halftone dots 26 having the diameter b in the unit compartment 50 is π × (b / 2) ² . Therefore, the halftone dot ratio in this case can be expressed by the following equation.
(Halftone dot ratio) = (π × b ² ) / (4 × a ² ) ・ ・ ・ (Equation 2)

In the example shown in FIG. 11, one side of the unit section 50 is designated as A. Let P be the point where the contours of the two halftone dots 26 centered on both ends of the side A intersect with each other. Let γ (rad) be the angle between the straight line B connecting one end O of the side A and the point P and the side A. Area of the region covered by the dot 26 has a diameter b in a unit compartment 50, π × (b / 2) of two adjacent ^two dot 26 How to have overlapped portion 4 times the area S ₁ of Obtained by subtracting the area. The area S ₁ is obtained as follows.
S ₁ = (π × (b / 2) ² × arccos (a / b) / (2 × π) − (1/2) × (a / 2) × (b / 2) × sinγ) × 2
Therefore,
S ₁ = (b / 4) × (b × arccos (a / b) -a × sinγ)
The halftone dot ratio can be expressed by the following formula.
(Halftone dot ratio) = (π × (b / 2) ² -4 × S ₁ ) / a ²
Finally, the halftone dot ratio can be expressed by the following formula.
(Halftone dot ratio) = (b ² / a ² ) x ((π / 4) -arccos (a / b)) + (b / a) x sinγ ... (Equation 3)

The arrangement pitch a of the halftone dots 26 and the diameter b of the halftone dots 26 can be measured using a digital microscope “VH-5500” manufactured by KEYENCE CORPORATION.

FIG. 12 is a diagram for explaining an example of the method for adjusting the maximum halftone dot ratio, and FIG. 13 is a diagram for explaining another example of the method for adjusting the maximum halftone dot ratio. Here, an example will be described in which the number X of the element design layers 25 included in the design layer 23 is 4, and the maximum halftone dot ratio Y of each element design layer 25 is 60%. In FIGS. 12 and 13, the halftone dot ratio of each part of the halftone dot image before the adjustment of the maximum halftone dot ratio is taken on the horizontal axis, and the halftone dot ratio of each part of the halftone dot image after the adjustment of the maximum halftone dot ratio is vertical. I'm on the axis. Further, in FIGS. 12 and 13, the halftone dot ratio of the halftone dot image before the adjustment of the maximum halftone dot ratio is shown by a broken line, and the halftone dot ratio of the halftone dot image after the adjustment of the maximum halftone dot ratio is shown by a solid line. .. In order to set the maximum halftone dot ratio Y of each element design layer 25 to 60%, for example, a predetermined color image forming a design to be displayed by the design layer 23 is superimposed to obtain the color image. , Black (BK), blue (C), red (M), and yellow (Y) are separated into four-color images, and the halftone dot ratio in the image is 0% to 100%. After converting to a halftone dot image, as shown in FIG. 12, the elements of each element design layer 25 are adjusted so that the halftone dot ratio of the portion where the halftone dot ratio exceeds 60% is adjusted to 60%. It is possible to create a halftone dot image that forms a design.

Further, as another example, black (BK), blue (C), and red (M) such that a predetermined color image forming a design to be displayed by the design layer 23 is superimposed to obtain the color image. The image is decomposed into four colors of yellow (Y) and yellow (Y), and the image of each color is converted into a mesh dot image such that the mesh dot ratio in the image is 0% to 100%, and then shown in FIG. As described above, the net point ratio of the entire net point image is reduced so that the net point ratio of the portion where the net point ratio was 100% before the adjustment becomes 60%, and the net point ratio of the entire net point image after the adjustment is reduced. May be converted into a net dot image such that is 0% or more and 60% or less to create a net dot image forming the element design of each element design layer 25.

When the light-shielding layer 51, the light-reflecting layer 55, and the design layer 23 (elemental design layer 25) are superposed, the decorative sheet 20 does not have halftone dots 26, 53, 57 along the normal direction. A region (light transmitting portion 27) is formed. As a result, the light incident from the second surface 20b of the decorative sheet 20 passes through the light transmitting portion 27 and is emitted from the first surface 20a. In the decorative sheet 20 of the present embodiment, the number X of the element design layers 25 included in the design layer 23 and the maximum halftone dot ratio Y (%) in each element design layer 25 (251 to 254) are the above-mentioned formulas. By satisfying 1), a sufficient area of the light transmitting portion 27 can be secured. Therefore, it is possible to output from the display device 15, a sufficient amount of the image light L _i emitted toward the observer 5 side through the light transmitting portion 27. That is, when the image light L _i is emitted from the display device 15, the image light L _i is well visible from the observer 5.

Further, the halftone dots 26, 53, 57 are formed on the base material 21 by using a printing technique such as screen printing or a photolithography technique. Therefore, in order to provide the light transmitting portion 27, it is not necessary to use laser processing which requires a large processing time and processing cost. This makes it possible to manufacture the decorative sheet 20 in a short time and at low cost.

Further, by configuring the design to be displayed by the design layer 23 with halftone dots 26, the degree of freedom in arranging each color represented by the halftone dots 26 is increased, and the reproducibility of colors and shades can be improved. Further, since the light transmitting portion 27 has a random shape and arrangement, a video display device having a large number of regularly arranged pixels, such as a liquid crystal display device and an organic EL display device, as the display device 15, in particular, is used. When the display device 15 and the decorative sheet 20 are overlapped with each other, it is possible to effectively suppress the occurrence of moire.

In the present embodiment, the number X of the element design layers 25 included in the design layer 23 and the maximum halftone dot ratio Y (%) in each element design layer 25 (251 to 254) are related to the above equation 1. In addition, the following relationships may be further satisfied.
51.2 × X ^(−0.382) ≦ Y ・ ・ ・ (Equation 4)
Note that X is a natural number. For example, when the number X of the element design layers 25 included in the design layer 23 is 4, the maximum halftone dot ratio Y in each element design layer 25 is about 30.1% or more. When the maximum halftone dot ratio Y satisfies Equation 4, the area of the light transmitting portion 27 can be sufficiently secured, and the light reflectance in the design layer 23 can be sufficiently secured. As a result, when the image light _Li is not emitted from the display device 15, the design given to the design layer 23 of the decorative sheet 20 is satisfactorily visually recognized by the observer 5.

According to the study by the present inventors, as shown in Table 1, two types of element design layers 25 having different colors and arrangements of halftone dots 26 and a maximum halftone dot ratio Y of 40% are superposed. When the design layer 23 was formed (X = 2), the coverage of the halftone dots 26 in the design layer 23 was about 50%, and the observer 5 was able to observe a clear design. Similarly, the element design layer 25 having a maximum halftone dot ratio Y of 35%, 30%, 28%, and 25%, respectively, has 3 types (X = 3), 4 types (X = 4), and 5 types (X), respectively. = 5), 6 types (X = 6) were superposed, and the coverage of the halftone dots 26 in the design layer 23 was about 50%. Further, as a matter of course, when there is only one type of element design layer 25 (X = 1), the coverage ratio is 50% when the maximum halftone dot ratio Y is 50%. The above equation 4 is obtained as an approximate equation based on these data.

As shown in FIG. 7, the coverage by the halftone dots 26 in the design layer 23 after the plurality of element design layers 25 are superposed is preferably 50% or more and 95% or less. Further, the maximum halftone dot ratio in the light-shielding layer 51 and the light-reflecting layer 55 is also preferably (numerical value 1)% or less. In this case, the area of the light transmitting portion 27 in the decorative sheet 20 can be further sufficiently secured. Therefore, it is possible to output from the display device 15, further to secure a sufficient amount of the image light L _i emitted toward the observer 5 side through the light transmitting portion 27. That is, when the image light L _i is emitted from the display device 15, the image light L _i is better visible from the observer 5.

In the present embodiment, the design layer 23 is formed by superimposing the four element design layers 25 of the first element design layer 251 to the fourth element design layer 254, but the element design layer 25 forming the design layer 23 The number X is not limited to this. The design layer 23 may be formed by superimposing one, two, three, or five or more element design layers 25. However, from the viewpoint of sufficiently securing the area of the light transmitting portion 27, the number X of the element design layers 25 forming the design layer 23 is preferably 6 or less, and more preferably 5 or less.

Each element design layer 25 preferably has a thickness of 2 μm or more and 15 μm or less. When the thickness of the element design layer 25 is 2 μm or more, sufficient light reflectance can be secured at the halftone dots 26 included in the element design layer 25. Therefore, when the image light _Li is not emitted from the display device 15, the design given to the design layer 23 of the decorative sheet 20 is well visible to the observer 5. Further, since the thickness of the element design layer 25 is 2 μm or more, when a plurality of halftone dots 26 overlap along the normal direction of the design layer 23, the halftone dots 26 are displayed more than the halftone dots 26. It is possible to absorb the light emitted from the other halftone dots 26 located on the device 15 side, thereby suppressing the occurrence of color mixing due to the plurality of halftone dots 26 overlapping in the normal direction. Further, when the thickness of the element design layer 25 is 15 μm or less, the element design layer 25 can be printed at one time by using screen printing or photolithography technology, so that it is not necessary to print a plurality of times. The printing process can be simplified, and the element design displayed by the element design layer 25 can be prevented from becoming unclear due to the printing position shift between a plurality of times of printing. Further, each element design layer 25 preferably has a thickness of 5 μm or more and 15 μm or less, and further preferably 9 μm or more and 15 μm or less.

FIG. 14 schematically shows a state of reflection of light incident from the front surface (first surface) 20a of the decorative sheet 20 when the black plate 30 is arranged on the back surface (second surface) 20b side of the decorative sheet 20. Shown in. ^{At this time, in the L *} a ^* b ^* color system of the light incident from the front surface 20a of the decorative sheet 20 and reflected by the black plate 30 when the black plate 30 is arranged on the back surface 20b side of the decorative sheet 20. L ^* of the value _{^{L * 1, a * a *}} 1 a value of, ^{b *} of the value and ^b _{* 1,} the decorative sheet 20 of the incident from the front surface 20a design layer 23 and the light design layer is reflected by the 23 ^a _* 2, the values of ^{L _* L *} 2, ^{a *} values in the light of the ^L * ^a * ^{b *} color system that has been transmitted through the design layer 23 again reflected by the light reflecting layer 55 passes through the ^{b *} When the value of is b ^* ₂ , the color difference ΔE ^* ab defined by the following equation is preferably 0.7 or more in the SCI method and 0.7 or more in the SCE method.
ΔE ^* ab = ((L ^* _1- L ^* ₂ ) ² + (a ^* _1- a ^* ₂ ) ² + (b ^* _1- b ^* ₂ ) ² ) ^1/2 ... (Equation 5)

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

The values of L * 1 and L * 2 can be obtained as follows. First, the visible light transmittance of the entire design layer 23 is measured using a spectrocolorimeter "CM-700d" manufactured by Konica Minolta. Next, a square region having a side length of 1 mm is set at a portion of the design layer 23 having the lowest visible light transmittance. After that, using the above-mentioned spectrocolorimeter "CM-700d", the illumination diameter (diameter) is set to 11 mm, the measurement diameter (diameter) is set to 8 mm, and L * 1 , a * is set in the light transmitting portion 27 in the square region. 1, and b * 1 were measured, in the area where halftone 26 square area is present to measure the L * 2, a * 2, and b * 2 values.

The SCI (Special Component) method is a method of measuring color including specular reflected light, and the SCE (Specular Component Expert) method is a method of measuring color excluding specular reflected light. In the above-mentioned spectrophotometer CM-700d, it is possible to switch between the SCI method and the SCE method by setting.

By measured in SCI mode Delta] E ^* ab and SCE type measured Delta] E ^* ab in is both 0.7 or more, when the image light _{L i} from the display device 15 is not emitted, the decorative sheet 20 The contrast of the design displayed by the design layer 23 of the above can be effectively improved. ^{Further, it is more preferable that both the ΔE *} ab measured in the SCI method and the ΔE ^* ab measured in the SCE method are 1.0 or more, and in the ΔE ^* ab and the SCE method measured in the SCI method. It is more preferable that both measured ΔE ^{* abs are 1.5 or more.}

The visible light transmittance of the light transmitted through the decorative sheet 20 along the normal direction of the base material 21 is preferably 5% or more and 55% or less. When the visible light transmittance is 5% or more, it can be emitted from the display device 15, a sufficient amount of the image light L _i emitted toward the observer 5 side through the decorating sheet 20 .. That is, when the image light L _i is emitted from the display device 15, the image light L _i is well visible from the observer 5. Further, when the visible light transmittance is 55% or less, the density of the design displayed by the design layer 23 can be sufficiently secured. That is, when the image light _Li is not emitted from the display device 15, the visibility of the design displayed by the design layer 23 of the decorative sheet 20 can be effectively improved. The visible light transmittance of the light transmitted through the decorative sheet 20 along the normal direction of the base material 21 is more preferably 10% or more and 35% or less, and more preferably 15% or more and 25% or less. More preferred.

FIG. 15 schematically shows how the light emitted from the D65 light source 40 passes through the decorative sheet 20. At this time, the value of ^{a *} and ^a _* 3, ^{b *} of the value and ^b _{* 3} in ^{the L} * ^a * ^{b *} color system of the light emitted from the D65 light source 40, the substrate 21 is emitted from the D65 light source 40 the values of ^{a _* a *} 4, ^{b *} of the values is taken as ^b _{* 4} in the light of the ^L * ^a * ^{b *} color system that has been transmitted through the decorating sheet 20 along the normal ^{direction, a} _{* 3} , B ^* ₃ , a ^* ₄ and b ^* ₄ preferably satisfy the following relationship.
((A ^* _3- a ^* ₄ ) ² + (b ^* _3- b ^* ₄ ) ² ) ^1/2 ≤ 7 ... (Equation 6)
The value of ((a ^* _3- a ^* ₄ ) ² + (b ^* _3- b ^* ₄ ) ² ) ^1/2 is more preferably 5 or less, and further preferably 4 or less.

The D65 light source 40 is a CIE standard light source D65. The values of a ^* ₃ , b ^* ₃ , a ^* ₄ and b ^* ₄ can be measured using "UV-3100PC" (JIS K 0115 compliant product) manufactured by Shimadzu Corporation.

When a ^* ₃ , b ^* ₃ , a ^* ₄ and b ^* ₄ satisfy Equation 6, the change in the color of the light transmitted through the decorative sheet 20 can be reduced. Therefore, it is possible to effectively prevent the color of the image light L _i which has passed through the decorative sheet 20 is emitted from the display device 15 is changed.

When the display device 15 includes a touch panel, the sheet resistance of the decorative sheet 20 ^{is preferably 1 × 10 6} Ω / □ or more. If the sheet resistance of the decorative sheet 20 is small, the touch panel may not be able to appropriately detect the approach of a conductor such as an operator's finger via the decorative sheet 20. On the other hand, when the sheet resistance of the decorative sheet 20 is 1 × 10 ⁶ Ω / □ or more, the approach of the conductor via the decorative sheet 20 can be appropriately detected by the touch panel. When the display device 15 is a display of the dot matrix type, the sheet resistance of the decorative sheet 20, and more preferably 1 × 10 ⁸ Ω / □ or more. The sheet resistance of the decorative sheet 20 can be measured using, for example, a resistivity meter (High Leicester UP MCP-HT450) manufactured by Mitsubishi Chemical Analytech Co., Ltd.

As an example, the decorative sheet 20 described above can be manufactured as follows. 16 to 21 are partial cross-sectional views showing one step of an example of a method for manufacturing the decorative sheet 20. Hereinafter, an example in which the light-shielding layer 51, the light-reflecting layer 55, and each element design layer 25 are printed by using a photolithography technique will be described. Not limited to this, the light-shielding layer 51, the light-reflecting layer 55, and each element design layer 25 may be formed by using another method such as a screen printing method. Further, the light-shielding layer 51, the light-reflecting layer 55, and each element design layer 25 may be formed by the same method or different methods from each other.

(Shading layer forming process)
As shown in FIG. 16, a light-shielding layer 51 is formed on the first surface 21a of the base material 21. The light-shielding layer 51 is formed so as to include a plurality of halftone dots 53 having the same color. First, a light-shielding layer-sensitive photosensitive layer containing a colored material having black or gray and a positive-type or negative-type photosensitive material is formed on the first surface 21a of the base material 21. As the photosensitive layer for the light-shielding layer, for example, a film-like member containing a colored material and a photosensitive material is attached on the first surface 21a, or a material having a fluidity by mixing the colored material and the photosensitive material is used as the first. It can be formed by applying it on the surface 21a. Next, the photosensitive layer for the light-shielding layer is exposed through a photomask having a light-shielding pattern having a shape corresponding to the pattern shape of the light-shielding layer 51 to be formed (see FIG. 8). At this time, when a positive photosensitive material is used as the photosensitive material, a photomask having a light-shielding pattern having the same shape as the pattern shape of the light-shielding layer 51 to be formed is used. When a negative photosensitive material is used as the photosensitive material, a photomask having a light-shielding pattern having a shape obtained by reversing the pattern shape of the light-shielding layer 51 to be formed is used. The relationship between the type of photosensitive material (positive type, negative type) and the shape of the light-shielding pattern of the photomask is the same in the light-reflecting layer forming step and the design layer forming step described later.

In the present embodiment, the pattern shape of the light-shielding layer 51 to be formed is determined according to the pattern shape of the halftone dots 26 of the design layer 23 to be formed later. In particular, the pattern shape of the light-shielding layer 51 to be formed corresponds to the pattern shape in which the halftone dots 26 of all the element design layers 25 are overlapped, as shown in FIG. Preferably, the pattern shape of the light-shielding layer 51 to be formed is the same as the pattern shape in which the halftone dots 26 of all the element design layers 25 are overlapped.

Then, the photosensitive layer for the light-shielding layer is developed using a developing solution. When a positive type photosensitive material is used as the photosensitive material, the exposed portion of the light-shielding layer photosensitive layer is dissolved, and when a negative type photosensitive material is used as the photosensitive material, the light-shielding layer is used. The unexposed portion of the photosensitive layer is dissolved. As a result, the light-shielding layer 51 is formed from the light-shielding layer for the light-shielding layer.

(Light reflective layer forming process)
Next, as shown in FIG. 17, a light reflecting layer 55 is formed on the light shielding layer 51. That is, the light reflecting layer 55 is provided on the side (one side, the observer 5 side) opposite to the base material 21 with respect to the light shielding layer 51. The light reflecting layer 55 is formed so as to include a plurality of halftone dots 57 having the same color. First, a photosensitive layer for a light reflecting layer containing a colored material having white color and a photosensitive material is formed on the light-shielding layer 51 and on the first surface 21a exposed from the light-shielding layer 51. In the photosensitive layer for the light reflecting layer, for example, a film-like member containing a colored material and a photosensitive material is attached on the light-shielding layer 51 and the first surface 21a, or the colored material and the photosensitive material are mixed and fluidized. Can be formed by applying a material having a light-shielding layer 51 onto the light-shielding layer 51 and the first surface 21a. Next, the photosensitive layer for the light reflecting layer is exposed through a photomask having a light-shielding pattern corresponding to the pattern shape (see FIG. 9) of the light reflecting layer 55 to be formed. Then, the photosensitive layer for the light reflecting layer is developed using a developing solution. As a result, the light reflecting layer 55 is formed from the photosensitive layer for the light reflecting layer.

In the present embodiment, the pattern shape of the light reflecting layer 55 to be formed is determined according to the pattern shape of the halftone dots 26 of the design layer 23 to be formed later. As described above, the pattern shape of the light-shielding layer 51 is also determined according to the pattern shape of the halftone dots 26 of the design layer 23 to be formed later. Therefore, the pattern shape of the light reflecting layer 55 to be formed can be the same as the pattern shape of the light shielding layer 51. In this case, it is possible to use the same photomask as the photomask used in the light-shielding layer forming step in the light-reflecting layer forming step. That is, the light-shielding layer 51 formed by arranging the photomask used in the light-shielding layer forming step at the same position as during the exposure in the light-shielding layer forming step and exposing the photosensitive layer for the light-reflecting layer. The pattern shape and the pattern shape of the light reflecting layer 55 can be accurately matched. If the decorative sheet 20 is not provided with the light reflecting layer 55, the light reflecting layer forming step is omitted.

(Design layer forming process)
Next, as shown in FIGS. 18 to 21, the design layer 23 is formed. In the present embodiment, an example in which the design layer 23 is formed on the light reflecting layer 55 will be described. That is, the design layer 23 is provided on the side (one side, the observer 5 side) opposite to the base material 21 and the light shielding layer 51 with respect to the light reflecting layer 55. If the light reflection layer forming step is omitted, the design layer 23 is formed on the light shielding layer 51. The design layer 23 of the present embodiment includes four element design layers 25 of the first element design layer 251 (25) to the fourth element design layer 254 (25). In the design layer forming step, a first element design layer 251 forming step (see FIG. 18), a second element design layer 252 forming step (see FIG. 19), and a third element design layer 253 forming step (see FIG. 20). And the step of forming the fourth element design layer 254 (see FIG. 21) is performed in this order.

Each element design layer 25 is formed so as to include a plurality of halftone dots 26 having the same color. First, an element design layer photosensitive layer containing a colored material and a photosensitive material is formed. In the present embodiment, the colored material for forming the first element design layer 251 has black (BK), and the colored material for forming the second element design layer 252 has blue (C). The colored material for forming the third element design layer 253 has a red color (M), and the colored material for forming the fourth element design layer 254 has a yellow color (Y). The element design layer photosensitive layer is, for example, a film-like member containing a colored material and a photosensitive material is attached on a surface on which the element design layer 25 is to be formed, or a colored material and a photosensitive material are mixed and fluidized. It can be formed by applying a material having. Next, the photosensitive layer of the element design layer is exposed through a photomask having a light-shielding pattern corresponding to the pattern shape of the element design layer 25 to be formed (see FIGS. 3 to 6). Then, the element design layer photosensitive layer is developed using a developing solution. As a result, the element design layer 25 is formed from the element design layer photosensitive layer. By repeating this for the first element design layer 251 to the fourth element design layer 254, the design layer 23 is formed on the light reflecting layer 55.

(Coating layer forming process)
A glass or resin film is attached to the base material 21, the light-shielding layer 51, the light-reflecting layer 55, and the design layer 23, or a fluid resin material is applied and cured to cure the glass or resin film. Alternatively, the coating layer 28 is formed from the cured resin material. From the above, the decorative sheet 20 shown in FIG. 2 can be manufactured.

The decorative sheet 20 of the present embodiment has a light-transmitting base material 21 having a first surface 21a facing one side and a second surface 21b facing the other side, and faces one side from the other side. The light-shielding layer 51 and the design layer 23 are laminated in this order, the design layer 23 has at least one element design layer 25, and the light-shielding layer 51 and each element design layer 25 have the same color. Includes a plurality of net points 53 and 26.

The display device 10 with a decorative sheet of the present embodiment has a display device 15 having a display surface 17 and the above-mentioned decorative sheet 20 provided facing the display surface 17.

According to the decorative sheet 20 and the display device 10 with the decorative sheet, it is not necessary to use laser processing, which requires a large processing time and processing cost, in order to provide the light transmitting portion 27. This makes it possible to manufacture the decorative sheet 20 in a short time and at low cost.

Further, since the decorative sheet 20 has the light-shielding layer 51, it is possible to prevent light incident on the decorative sheet 20 from the other side from being incident on the design layer 23 (element design layer 25). Can be done. Therefore, the light incident on the decorative sheet 20 from the other side is mixed with the light emitted from the design layer 23 to one side by passing through the plurality of halftone dots 26 overlapping along the normal direction of the design layer 23. Can be effectively suppressed.

Further, by configuring the design to be displayed by the design layer 23 with halftone dots 26, the degree of freedom in arranging each color represented by the halftone dots 26 is increased, and the reproducibility of colors and shades can be improved. Further, since the light transmitting portion 27 has a random shape and arrangement, a video display device having a large number of regularly arranged pixels, such as a liquid crystal display device and an organic EL display device, as the display device 15, in particular, is used. When the display device 15 and the decorative sheet 20 are overlapped with each other, it is possible to effectively suppress the occurrence of moire.

In the decorative sheet 20 of the present embodiment, the halftone dots 26 of each element design layer 25 are arranged on one side of the halftone dots 53 of the light-shielding layer 51.

According to such a decorative sheet 20, in the plan view of the decorative sheet 20, the halftone dots 26 of each element design layer 25 are arranged at the same positions as the halftone dots 53 of the light-shielding layer 51, so that the light-shielding layer 51 The area of the non-formed region can be increased. Therefore, a sufficient area of the light transmitting portion 27 can be secured. Therefore, it is possible to output from the display device 15, a sufficient amount of the image light L _i emitted toward the observer 5 side through the light transmitting portion 27. That is, when the image light L _i is emitted from the display device 15, the image light L _i is well visible from the observer 5.

In the decorative sheet 20 of the present embodiment, a light reflecting layer 55 including a plurality of halftone dots 57 having the same color is provided between the light shielding layer 51 and the design layer 23.

According to such a decorative sheet 20, the light incident on the decorative sheet 20 from one side and transmitted through the halftone dots 26 is reflected by the light reflecting layer 55, and the light reflecting layer 55 transmits the halftone dots 26 to one side. Can be returned. Therefore, each halftone dot 26 can be satisfactorily colored, and the contrast of the design displayed by the design layer 23 when the _{image light Li is not emitted from the display device 15 can be effectively improved.}

In the decorative sheet 20 of the present embodiment, the halftone dots 57 of the light reflecting layer 55 are arranged on one side of the halftone dots 53 of the light shielding layer 51, and the halftone dots 26 of each element design layer 25 are the light reflecting layer 55. It is arranged on one side of the halftone dot 57.

According to such a decorative sheet 20, in the plan view of the decorative sheet 20, the halftone dots 26 of each element design layer 25, the halftone dots 57 of the light reflection layer 55, and the halftone dots 53 of the light-shielding layer 51 are the same as each other. Since it is arranged at the position, the area of the non-formed region of the light-shielding layer 51 and the light-reflecting layer 55 can be increased. Therefore, a sufficient area of the light transmitting portion 27 can be secured. Therefore, it is possible to output from the display device 15, a sufficient amount of the image light L _i emitted toward the observer 5 side through the light transmitting portion 27. That is, when the image light L _i is emitted from the display device 15, the image light L _i is well visible from the observer 5.

The decorative sheet 20 of the present embodiment has a sheet resistance of 1 × 10 ⁶ Ω / □ or more.

According to such a decorative sheet 20, when the display device 15 is provided with a touch panel, the touch panel can appropriately detect the approach of the conductor through the decorative sheet 20.

In the display device 10 with a decorative sheet of the present embodiment, the display device 15 is a dot matrix type display.

According to such a display device 10 with a decorative sheet, it is possible to impart designability to the dot matrix type display.

Various changes can be made to the above-described embodiments. Hereinafter, a modified example will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same codes as those used for the corresponding parts in the above-described embodiment will be used for the parts that can be configured in the same manner as in the above-described embodiment. Duplicate explanations will be omitted. Further, when it is clear that the action and effect obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

As a modification of the decorative sheet 20, the light-shielding layer 51 and the light-reflecting layer 55 may be provided on the other side of the base material 21. FIG. 22 is a partial cross-sectional view showing a modified example of the decorative sheet 20. The decorative sheet 20 has a design layer 23 laminated on one side of the base material 21 and a light-shielding layer 51 laminated on the other side of the base material 21. In the illustrated example, the light reflecting layer 55 is provided between the base material 21 and the light shielding layer 51. That is, the design layer 23 is provided on the first surface 21a of the base material 21, and the light reflecting layer 55 and the light-shielding layer 51 are provided on the second surface 21b of the base material 21 in order from one side (base material 21 side). ing.

FIG. 23 is a partial cross-sectional view showing another modification of the decorative sheet 20. In this modification, the design layer 23, the light reflection layer 55, and the light-shielding layer 51 are provided on the other side of the base material 21, and the first surface 21a of the base material 21 is the first surface 20a of the decorative sheet 20. The light emitting surface 10a of the display device 10 with a decorative sheet is formed. In the decorative sheet 20 of this modification, the design layer 23 is first formed on the second surface 21b of the base material 21, and then the light reflecting layer 55 and the light shielding layer 51 are formed on the other side of the design layer 23 in this order. As a result, it can be manufactured. When forming the plurality of element design layers 25 constituting the design layer 23 in this modification, the element design layers 25 that should be located closest to the observer 5 are formed on the second surface 21b in order. As an example, by forming the fourth element design layer 254, the third element design layer 253, the second element design layer 252, and the first element design layer 251 on the second surface 21b in this order, the element design layers 251 to 254 The design layer 23 including the above can be formed.

According to this modification, the base material 21 can be used as a protective layer for the design layer 23, the light reflection layer 55, and the light shielding layer 51, so that the coating layer 28 can be omitted. Therefore, the decorative sheet 20 can be made thinner and lighter. In addition, the manufacturing process of the decorative sheet 20 can be simplified.

Not limited to this, the purpose is to protect the design layer 23, the light reflection layer 55, and the light-shielding layer 51 from contact with the display device 15, and to bring the members arranged on the back surface side of the light-shielding layer 51 into contact with each other. A coating layer 28 may be provided so as to cover the second surface 21b of the base material 21, the design layer 23, the light reflecting layer 55, and the light shielding layer 51 from the display device 15 side. Such a coating layer 28 preferably has a high visible light transmittance.

As another variation, the value of ^{a *} and ^a _* 3, ^{b *} of the value and ^b _{* 3} in the light of the ^L * ^a * ^{b *} color system emerging from the D65 light source 40, light shielding emitted from D65 light source 40 the values of ^{a *} a layer 51 in the light of the ^L * ^a * ^{b *} color system transmitted along the normal direction of ^a _* 5, ^{b *} values when the _{^{b * 5, a * 3,}} b ^{It is preferable that *} ₃ , a ^* ₅ and b ^* ₅ satisfy the following relationship.
((A ^* _3- a ^* ₅ ) ² + (b ^* _3- b ^* ₅ ) ² ) ^1/2 ≤ 7 ... (Equation 7)

When a ^* ₃ , b ^* ₃ , a ^* ₅ and b ^* ₅ satisfy Equation 7, the change in the tint of the light transmitted through the light-shielding layer 51 can be reduced. Therefore, it is possible to effectively prevent the color of the image light L _i which has passed through the decorative sheet 20 is emitted from the display device 15 is changed. The value of ((a ^* _3- a ^* ₅ ) ² + (b ^* _3- b ^* ₅ ) ² ) ^1/2 is more preferably 5 or less, and further preferably 4 or less.

As still another modification, the value of a * and a * 3, b * of the value and b * 3 in the light of the L * a * b * color system emerging from the D65 light source 40, is emitted from the D65 light source 40 when the value of a * in the light of the L * a * b * color system transmitted along the light reflective layer 55 in the normal direction a * 6, b * of the values was b * 6, a * 3 , B * 3 , a * 6 and b * 6 preferably satisfy the following relationship.
((A * 3- a * 6 ) 2 + (b * 3- b * 6 ) 2 ) 1/2 ≤ 7 ... (Equation 8)

When a ^* ₃ , b ^* ₃ , a ^* ₆ and b ^* ₆ satisfy Equation 8, the change in the tint of the light transmitted through the light reflecting layer 55 can be reduced. Therefore, it is possible to effectively prevent the color of the image light L _i which has passed through the decorative sheet 20 is emitted from the display device 15 is changed. The value of ((a ^* _3- a ^* ₆ ) ² + (b ^* _3- b ^* ₆ ) ² ) ^1/2 is more preferably 5 or less, and further preferably 4 or less.

Although some modifications to the above-described embodiments have been described above, it is naturally possible to apply a plurality of modifications in combination as appropriate.

5 Observer 10 Display device with decorative sheet 10a Emitting surface 15 Display device 17 Display surface 17A Display area 17B Non-display area 20 Decorative sheet 20a First surface 20b Second surface 21 Base material 21a First surface 21b Second surface 23 Design layer 25 Element Design layer 26 Halftone dots 27 Light transmission part 28 Coating layer 30 Black plate 40 D65 Light source 51 Light-shielding layer 53 Halftone dots 55 Light reflection layer 57 Halftone dots

Claims (7)

A base material having light transmission and having a first surface facing one side and a second surface facing the other side,
A light-shielding layer and a design layer laminated in order from the other side to the one side are provided.
The design layer has at least one elemental design layer.
The light-shielding layer and each element design layer are decorative sheets containing a plurality of halftone dots having the same color. The decorative sheet according to claim 1, wherein the halftone dots of each element design layer are arranged on the one side of the halftone dots of the light-shielding layer. The decorative sheet according to claim 1 or 2, wherein a light reflecting layer including a plurality of halftone dots having the same color is provided between the light-shielding layer and the design layer. The halftone dots of the light reflecting layer are arranged on the one side of the halftone dots of the light shielding layer.
The decorative sheet according to claim 3, wherein the halftone dots of each element design layer are arranged on the one side of the halftone dots of the light reflecting layer. The decorative sheet according to any one of claims 1 to 4, wherein the sheet resistance is 1 × 10 ^{6 Ω / □ or more.} A display device with a display surface and
A display device with a decorative sheet, comprising the decorative sheet according to any one of claims 1 to 5, which is provided facing the display surface. The display device is a dot matrix type display.
The display device with a decorative sheet according to claim 6.

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