JP2022088405A - Decorative sheet, display device with decorative sheet, and display device with panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it hard to recognize difference in design between an area facing a display surface of a decorative sheet and areas other than the area facing the display surface at a low cost.

SOLUTION: A decorative sheet 50 includes: a first area 50a covering a display surface 41 of at least a display device 40; and a second area 50b adjacent to the first area 50a. The decorative sheet 50 is provided with: a pattern part 53; and a transmission part 57 to be a non-formation part of the pattern part 53 provided at least in the first area 50a. A proportion of the transmission part 57 in the first area 50a is higher than the proportion of the transmission part 57 in the second area 50b. L^* ₁ to be value of L^*, a^* ₁ to be value of a^*, and b^* ₁ to be value of b^* in an L^*a^*b^* color system in the first area 50a and L^* ₂ to be value of L^*, a^* ₂ to be value of a^*, and b^* ₂ to be value of b^* in an L^*a^*b^* color system in the second area 50b satisfy the following relation: ((L^* ₁-L^* ₂)²+(a^* ₁-a^* ₂)²+(b^* ₁-b^* ₂)²)^1/2≤3.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

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

For example, a display device for displaying image light as described in Patent Document 1 is known. Such a display device is usually observed in black when the image is not displayed. On the other hand, in surface members such as automobiles, furniture, and housing building materials, designability is very important. At present, display devices applied in various fields are expected not only to have a function of simply displaying an image, but also to be in harmony with the surrounding environment in terms of design.

In order to give the display device a design, it was considered to provide a decorative sheet facing the display surface of the display device. The decorative sheet can impart a design that can be harmonized with the surrounding environment of the display device. Further, a transmission portion such as a hole is provided in the region facing the display surface of the decorative sheet so that the image light of the display device can pass through the decorative sheet.

Japanese Unexamined Patent Publication No. 9-114003

By the way, when the decorative sheet is provided with the transparent portion, the design cannot be displayed in the portion where the transparent portion is provided, so that the design of the decorative sheet is thinly observed. If the transmissive portion is provided only in the area facing the display surface of the decorative sheet, the design of the decorative sheet is thinly observed only in the area facing the display surface. That is, there is a difference in design between the area facing the display surface of the decorative sheet and the area other than the area facing the display surface of the decorative sheet. Due to this difference in design, the design of the decorative sheet may be deteriorated, and the harmony of the design with the surrounding environment may be disturbed.

In order to eliminate the difference in design between the area facing the display surface of the decorative sheet and the area other than the area facing the display surface, not only the area facing the display surface of the decorative sheet but also the display surface It is conceivable to provide a transmissive portion in a region other than the facing region. That is, it was considered to provide a transparent portion uniformly over the entire decorative sheet. However, since the processing step of providing the transmissive portion is costly, it is not preferable to provide the transmissive portion on the entire decorative sheet.

The present invention has been made in consideration of such a point, and has a design property between the area facing the display surface of the decorative sheet and the area other than the area facing the display surface at low cost. The purpose is to make it difficult to recognize the difference.

The decorative sheet of the present invention is a decorative sheet including at least a first region covering the display surface of the display device and a second region adjacent to the first region.
It is provided with a pattern portion and a transmission portion which is a non-forming portion of the pattern portion provided at least in the first region.
The proportion of the transmissive portion in the first region is higher than the proportion of the transmissive portion in the second region.
L ^* a ^* b ^* in the first region, L ^* ₁ which is the value of L ^* in the color system, a ^{* 1 which is the value of a *, b *} ₁ ^{which is} _the value of b ^* , and the second region. L ^* a ^* b ^* L ^* ₂ , which is the value of L ^* in the color system, a ^* ₂ , which is the value of a ^* , and b ^* ₂ , which is the value of b ^* , satisfy the following relationship.
((L ^* ₁ -L ^* ₂ ) ² + (a ^* ₁ -a ^* ₂ ) ² + (b ^* ₁ -b ^* ₂ ) ² ) ^1/2 ≤ 3

In the decorative sheet of the present invention, the ratio of the transmissive portion in the first region may be 10% or more and 50% or less.

The decorative sheet of the present invention may further include a shielding portion that covers the pattern portion at least in the first region.

In the decorative sheet of the present invention, the thickness of the shielding portion in the first region may be thicker than the thickness of the shielding portion in the second region.

In the decorative sheet of the present invention, the density of the pigment contained in the pattern portion in the first region may be higher than the density of the pigment contained in the pattern portion in the second region.

In the decorative sheet of the present invention, the thickness of the pattern portion in the first region may be thicker than the thickness of the pattern portion in the second region.

In the decorative sheet of the present invention, the area ratio of the halftone dots of the pattern portion in the first region may be larger than the area ratio of the halftone dots of the pattern portion in the second region.

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

In the display device with a decorative sheet of the present invention, the transmissive portions may be arranged in a direction non-parallel to the arrangement direction of the pixels of the display device.

According to the present invention, it is possible to make it difficult to recognize the difference in design between the area facing the display surface of the decorative sheet and the area other than the area facing the display surface at low cost.

FIG. 1 is an exploded perspective view schematically showing each element of a display device with a panel. FIG. 2 is a cross-sectional view of a display device with a panel. FIG. 3 is a front view of the display device with a panel. FIG. 4 is a cross-sectional view of the decorative sheet, and is an enlarged view showing a pattern portion in the first region and a pattern portion in the second region, respectively. FIG. 5 is a plan view showing halftone dots of the pattern portion in the first region. FIG. 6 is a plan view showing halftone dots of the pattern portion in the second region. FIG. 7 is an enlarged front view showing the decorative sheet in the first region. FIG. 8 is a modification of the display device with a panel of FIG. FIG. 9 is a front view of a conventional display device with a panel corresponding to FIG.

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 and the aspect ratios are appropriately changed and exaggerated from those of the actual product for the convenience of illustration and comprehension.

In addition, in this specification, the terms "layer", "sheet" and "film" are not distinguished from each other based only on the difference in designation. For example, the term "sheet" is a concept that also includes members that may be called layers or films.

In addition, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle, etc., which specify the shape and geometric conditions and their degrees as used in the present specification, are strictly referred to. Without being bound by the meaning, we will interpret it including the range where similar functions can be expected.

FIG. 1 is an exploded perspective view schematically showing a display device 10 with a panel according to an embodiment of the present invention. As shown in FIG. 1, the display device 10 with a panel includes a display device 20 with a decorative sheet and a panel member 30. The display device 20 with a decorative sheet has a display device 40 having a display surface 41 and a decorative sheet 50 provided facing the display surface 41. Further, the display device 10 with a panel includes a display device 40 and a panel 15 provided facing the display surface 41 of the display device 40, and the panel 15 includes a panel member 30 and a decorative sheet 50. I'm out. In the illustrated example, the display device 10 with a panel is shown in a flat plate shape, but the display device 10 with a panel is curved by bending each component of the display device 10 with a panel described later. It may be in shape.

The display device 40 is a device that emits image light, and has a display surface 41 capable of emitting image light. As the display device 40, any display device such as a liquid crystal display, a plasma display, or an organic EL display can be used. The display surface 41 of such a display device 40 is typically a glass surface. Further, the pixels px of the display device 40 are arranged along the first direction d1 shown in FIG. 1 and the second direction d2 orthogonal to the first direction d1.

The panel member 30 is arranged between the display device 40 and the decorative sheet 50. Further, the panel member 30 has an opening 37. In the observation from the normal direction to the display surface 41, the display surface 41 is located in the opening 37. Further, as will be described later, the decorative sheet 50 includes a transmitting portion 57 capable of transmitting visible light. Therefore, the image light emitted from the display surface 41 of the display device 40 can pass through the panel member 30 through the opening 37, and can also pass through the decorative sheet 50. When the image light passes through the panel member 30 and the decorative sheet 50, the image light is emitted from the display device 10 with a panel, and an outside observer can observe the image formed by the image light.

The specific mode of the image light referred to here is not particularly limited, and the image light may include light in general regardless of the specific type and content. Image light can typically be composed of light that represents specific information, but the image is represented by light that has any other aspect, such as light that represents an irregular pattern or light that does not represent any specific information. Light may be configured. For example, the image light may be light that is transmitted through a printed transparent film or the like to display an image, or light that displays a bright or dark image by a light-shielding object.

In the example shown in FIGS. 1 and 2, the panel member 30 is provided around the display device 40 when the display device 10 with a panel is observed from the front. Conversely, the display device 40 is installed in the area where the panel member 30 is provided, and the display device 40 forms the display device 10 with a panel together with the panel member 30 and the decorative sheet 50. The panel member 30 is, for example, a plate-shaped member having a thickness of 0.01 mm or more and 5 mm or less. The panel member 30 may be a flat member, a curved member, or a member including a flat portion and a curved portion.

As shown in FIG. 2, the panel member 30 includes a base material layer 31 and a design layer 35 provided on the base material layer 31. The base material layer 31 is an element of the panel member 30, a member capable of appropriately supporting the design layer 35 in the present embodiment. The design layer 35 is a member for imparting design to the panel member 30, and is typically a dark color such as black. Such a design layer 35 is formed of, for example, a resin containing a black pigment. Examples of the black pigment include carbon black and titanium black. The design layer 35 may be provided with an arbitrary design property such as wood grain or marble depending on the environment in which the panel member 30 is provided.

Further, as shown in FIG. 1, the panel member 30 has a rectangular shape having a rectangular opening 37. However, the present invention is not limited to this, and the panel member 30 may have an L-shaped shape, a U-shaped shape, or the like, with a part removed from the rectangle. Even with such a shape, the image light emitted from the display surface 41 is generated by the panel member because the display surface 41 is located in the portion of the panel member 30 excluded from the rectangle when observed from the normal direction to the display surface 41. 30 can be transmitted. Further, the panel member 30 is not limited to a rectangular shape, and may have an arbitrary shape such as a circular shape. Further, the shape of the opening 37 may be any shape.

Next, the decorative sheet 50 will be described. The decorative sheet 50 imparts design to the display device 40. As shown in FIGS. 2 and 3, the decorative sheet 50 includes at least a first region 50a covering the display surface 41 of the display device 40 and a second region 50b covering the panel member 30. .. The first region 50a and the second region 50b are adjacent to each other. In the illustrated example, the second region 50b surrounds the first region 50a in a circumferential manner. Further, in the illustrated example, the first region 50a is a region facing the display surface 41a of the display device 40. However, the present invention is not limited to this example, and the first region 50a may be wider than the region facing the display surface 41a.

The decorative sheet 50 has a base material portion 51, a pattern portion 53 and a shielding portion 55 provided on the base material portion 51, and a transmission portion 57 which is a non-forming portion of the pattern portion 53 and the shielding portion 55. is doing. Further, the decorative sheet 50 is a value of L ^* a ^* b ^* in the first region 50a ^* , a value of L ^* ₁ in the color system, and a value of a ^* ₁ , b ^* in the color system ^{. *} ₁ and L ^* a ^* b ^* in the second region 50b, L ^* ₂ , which is the value of L ^* in the color system, a ^* ₂ , which is the value of a ^* , and b ^* ₂ , which is the value of b ^* , It meets the following relationships.
((L ^* ₁ -L ^* ₂ ) ² + (a ^* ₁ -a ^* ₂ ) ² + (b ^* ₁ -b ^* ₂ ) ² ) ^1/2 ≤ 3

The value of L ^* , the value of a ^{*, and the value of b * in} the L ^* a ^* b ^* color system can be measured using a colorimeter or a spectrocolorimeter. For the L ^* value, a ^* value, and b ^* value of the decorative sheet 50, for example, a spectrocolorimeter (“CM-700d” manufactured by Konica Minolta) is used at any 50 points of the decorative sheet 50. Therefore, it can be defined as the average value of the L ^* value, the a ^* value, and the b ^* value measured from the reflected light of the decorative sheet 50 under the condition of the measurement diameter Φ8 mm.

The base material portion 51 appropriately supports the pattern portion 53 and the shielding portion 55 provided on the base material portion 51. The base material portion 51 is a transparent film-like member. The base material portion 51 may be any material as long as it can transmit visible light and can appropriately support the pattern portion 53 and the shielding portion 55. For example, polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, etc. Examples thereof include polycarbonate, polystyrene, and cyclic polyolefin. Further, the base material portion 51 preferably has a thickness of 10 μm or more and 500 μm or less in consideration of visible light transmission and appropriate supportability of the pattern portion 53 and the shielding portion 55.

The pattern unit 53 displays the pattern displayed by the decorative sheet 50. The pattern unit 53 can display a pattern such as a figure, a pattern, a design, a color, a picture, a photograph, a character, a mark, a character or a number as a design. In particular, as a design that can be harmonized with the surrounding environment in which the display device 10 with a panel is provided, a wood grain or marble-like pattern or geometric pattern can be exemplified. Further, the pattern portion 53 may display a pattern of a single color as a design. In order to display such a pattern, the pattern portion 53 contains a pigment. The pigment may be a pigment of any color, for example carbon black, which is a black pigment. In FIG. 2, the cross-sectional shape of the pattern portion 53 is rectangular, but the cross-sectional shape is not limited to this, and may be a trapezoidal shape or the like.

In FIG. 4, the pattern portion 53 in the first region 50a and the second region 50b is shown in an enlarged manner, respectively. As shown in FIG. 4, the thickness Ha of the pattern portion 53a in the first region 50a is thicker than the thickness Hb of the pattern portion 53b in the second region 50b. Therefore, the design portion 53a in the first region 50a can display the design darker than the design portion 53b in the second region 50b. Here, the thickness of the pattern portion 53 is the length of the pattern portion 53 along the normal direction of the base material portion 51 that supports the pattern portion 53. As a specific example, the thickness Ha of the pattern portion 53a in the first region 50a is 1 μm or more and 20 μm or less, and the thickness Hb of the pattern portion 53b in the second region 50b is 0.5 μm or more and 20 μm or less.

Further, the concentration of the pigment contained in the pattern portion 53a in the first region 50a is higher than the concentration of the pigment contained in the pattern portion 53b in the second region 50b. The higher the concentration of the pigment, the deeper the color can be exhibited. Therefore, the design portion 53a in the first region 50a can display the design darker than the design portion 53b in the second region 50b. Here, the concentration of the pigment contained in the pattern portion 53 means a value represented by a percentage of the amount of the pigment in the total solid content of the pattern portion 53 including the pigment and the binder resin. As a specific example, the amount of the pigment in the total solid content of the pattern portion 53a in the first region 50a is 3% by mass or more and 40% by mass or less, and the amount of the pigment in the total solid content of the pattern portion 53b in the second region 50b. The amount is 1% by mass or more and 38% by mass or less.

Further, as shown in FIGS. 5 and 6, when the design displayed by the pattern portion 53 is represented by halftone dots 60, the area ratio of the halftone dots 60a of the pattern portion 53a in the first region 50a is the second. It is larger than the area ratio of the halftone dots 60b of the pattern portion 53b in the region 50b. Here, the area ratio of halftone dots is the ratio of the area where halftone dots are formed per unit area, and the unit can be% as an example. In FIGS. 5 and 6, each halftone dot 60 is represented by a circle. The larger the area ratio of the halftone dots 60, the darker the design represented by the halftone dots can be displayed. Therefore, the design portion 53a in the first region 50a can display the design darker than the design portion 53b in the second region 50b. As a specific example, the area ratio of the halftone dots 60a of the pattern portion 53a in the first region 50a is 50% or more and 99.5% or less, and the area ratio of the halftone dots 60b of the pattern portion 53b in the second region 50b is 55. % Or more and 99.9% or less. The size of each halftone dot 60 is, for example, 1 μm ² or more and 40,000 μm ² or less.

The shielding portion 55 is arranged between the pattern portion 53 and the base material portion 51, and covers the pattern portion 53 from the side of the base material portion 51. In FIGS. 2 and 4, the shielding portion 55a arranged between the pattern portion 53a and the base material portion 51 in the first region 50a and the shielding portion 55a arranged between the pattern portion 53b and the base material portion 51 in the second region 50b are arranged. The shielded portion 55b and the like are shown. However, the shielding portion 55 may be provided only in the first region 50a and may not be provided in the second region 50b. In other words, the shielding portion 55 is provided at least in the first region 50a. Preferably, the shielding portion 55 is provided only at a position facing the pattern portion 53. The shielding unit 55 has a function of absorbing light so that the image light from the display device 40 does not enter the pattern unit 53. The shielding portion 55 may contain, for example, light absorbing particles in the binder resin. Examples of the light absorbing particles include black pigments such as carbon black and titanium black. Further, in the example shown in FIG. 4, the thickness Ta of the shielding portion 55a in the first region 50a is thicker than the thickness Tb of the shielding portion 55b in the second region 50b. When the thick shielding portion 55 covers the pattern portion 53, the design of the pattern portion 53 can be displayed darkly. Therefore, the design portion 53a in the first region 50a can display the design darker than the design portion 53b in the second region 50b. As a specific example, the thickness Ta of the shielding portion 55a in the first region 50a is 1 μm or more and 20 μm or less, and the thickness Tb of the shielding portion 55b in the second region 50b is 0.5 μm or more and 20 μm or less.

The transmitting portion 57 is a non-forming portion of the pattern portion 53 when observed from the front of the decorative sheet 50, and can transmit the image light from the display device 40. The transmission portion 57 may be a hole or a void as in the illustrated example, but may be formed of, for example, a transparent resin. Further, the transparent portion 57 formed of the transparent resin may cover the pattern portion 53 and the shielding portion 55. Such a transparent portion 57 can function as a transparent protective film that protects the pattern portion 53 and the shielding portion 55.

In addition, transparency means the transmittance at each wavelength when measured within the measurement wavelength range of 380 nm to 780 nm using a spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation, JIS K 0115 compliant product). It means that the visible light transmittance specified as the average value of is 80% or more.

In the example shown in FIG. 2, the transmission portion 57 is provided only in the first region 50a. However, the transmission portion 57 may be provided in the second region 50b. The proportion of the transmissive portion 57 in the first region 50a is higher than the proportion of the transmissive portion 57 in the second region 50b. Here, the ratio of the transmissive portion is the ratio of the area where the transmissive portion is formed per unit area. The ratio of the transmissive portion 57 in the specific first region 50a is 50% or less so that the observer can clearly observe the design of the decorative sheet 50 in the image non-display state of the display device 40. preferable. Further, the ratio of the transmissive portion 57 in the first region 50a is preferably 10% or more in order to transmit the image light in the image display state of the display device 40.

It is preferable that the transmission unit 57 is arranged in a direction non-parallel to the arrangement direction of the pixels px of the display device 40 described above. In the present embodiment, as shown in FIG. 7, the transmission portion 57 has a third direction d3 inclined by 30 ° with respect to the first direction d1 which is the arrangement direction of the pixels and a 30 ° with respect to the second direction d2. They are arranged along each of the inclined fourth directions d4. Further, the transmission portion 57 is, for example, a circle having a diameter D of 50 μm or more and 200 μm or less. Further, the distance P between the arranged transmission portions 57 is 75 μm or more and 500 μm or less.

Next, the operation of the display device 10 with a panel according to the present embodiment will be described.

When the image is displayed on the display surface 41 of the display device 40, the image light passes through the opening 37 of the panel member 30 and the transmission portion 57 of the decorative sheet 50, and is observed by an outside observer. When the ratio of the transmitting portion 57 in the first region 50a covering the display surface 41 of the display device 40 is 10% or more, the observer can observe the image light having sufficient brightness.

Further, the pattern portion 53a in the first region 50a is covered from the side of the display device 40 by the shielding portion 55a. Therefore, the shielding portion 55a prevents the image light from incident on the pattern portion 53a. Therefore, it is possible to prevent the image light from passing through the pattern portion 53a and observing the design represented by the pattern portion 53a and the image light in a mixed manner. That is, it is possible to effectively prevent the color reproducibility of the image from being deteriorated due to the absorption of visible light in a specific wavelength range by the pattern portion 53a. Further, when the shielding portion 55a is provided only in the region facing the pattern portion 53a, it is possible to prevent the shielding portion 55a from obstructing the image light transmitted through the transmitting portion 57. That is, the image light can be efficiently used to display the image brightly.

Further, as shown in FIG. 7, the transmission portions 57 are arranged in a direction non-parallel to the arrangement direction of the pixels px of the display device 40. Therefore, the periodic structure of the array of pixels px of the display device 40 and the periodic structure of the array of the transmission unit 57 are less likely to interfere with each other, and it is possible to effectively suppress the observation of interference fringes together with the image. From the viewpoint of making the interference fringes inconspicuous, it is preferable to incline the arrangement directions d3 and d4 of the transmission portion 57 at an angle of 15 ° or more and 75 ° or less with respect to the arrangement directions d1 and d2 of the pixels px.

On the other hand, in a state where the image is not displayed on the display surface 41 of the display device 40, the design of the decorative sheet 50 is observed by the observer. In particular, when the visible light transmittance of the decorative sheet 50 is 50% or less, the observer can clearly observe the design of the decorative sheet 50. In particular, when the shielding portion 55 is provided only at a position facing the pattern portion 53, the shielding portion 55 is not observed by the observer, and the shielding portion 55 prevents the design of the decorative sheet 50 from being impaired. To.

By the way, as described above, in the display device 110 with a panel having the conventional decorative sheet 150 shown in FIG. 9, the transmissive portion is provided only in the region facing the display surface of the decorative sheet 150, that is, the first region 150a. Then, the design of the decorative sheet 150 becomes thinner in the first region 150a. Therefore, there is a difference in design between the first region 150a and the second region 150b.

On the other hand, in the display device 10 with a panel having the decorative sheet 50 of the present embodiment, the values of L ^* ₁ and a ^* , which are the values of L ^* a ^* b ^* in the color system, in the first region 50a ^. There are a ^* ₁ , b ^* values b ^* ₁ , and L ^* a ^* b ^* L ^* values in the second region 50b, L ^* ₂ , a ^* ₂ values ^. , B ^* ₂ , which is the value of b ^* , satisfies the following relationship.
((L ^* ₁ -L ^* ₂ ) ² + (a ^* ₁ -a ^* ₂ ) ² + (b ^* ₁ -b ^* ₂ ) ² ) ^1/2 ≤ 3
When this relationship is satisfied, the color difference between the first region 50a and the second region 50b is hardly recognized by the observer. That is, it is possible to make it difficult to recognize the difference in design between the region of the decorative sheet 50 facing the display surface 41 and the region other than the region facing the display surface 41.

Even in the display device 10 with a panel having the decorative sheet 50 of the present embodiment, since the transmission portion 57 is provided only in the first region 50a, the transmission portion 57 is provided in the first region 50a and the second region 50b. If the design is similarly configured except for the above, the design will be displayed lighter overall in the first region 50a as compared with the second region 50b, and the above-mentioned relationship will not be satisfied. Therefore, in order to satisfy the above-mentioned relationship, a device is made so that the design portion 53a in the first region 50a can display the design darker than the design portion 53b in the second region 50b.

For example, the thickness Ta of the shielding portion 55a in the first region 50a is thicker than the thickness Tb of the shielding portion 55b in the second region 50b, and the density of the pigment contained in the pattern portion 53a in the first region 50a is the second region. In 50b, the density is higher than the density of the pigment contained in the pattern portion 53b, the thickness Ha of the pattern portion 53a in the first region 50a is thicker than the thickness Hb of the pattern portion 53b in the second region 50b, and the first region 50a. The area ratio of the halftone dots 60a of the pattern portion 53a in the second region 50b is larger than the area ratio of the halftone dots 60b of the pattern portion 53b in the second region 50b. The part 53a can display the design darker than the pattern part 53b in the second area 50b. In this way, the above relationship can be satisfied. These can be carried out at a lower cost as compared with forming the transmission portion 57 in the second region 50b as well as in the first region 50a. However, the conditions for satisfying the above relationship are not limited to these.

For example, the transmission portion 57 is formed as follows. First, the pattern portion 53 and the shielding portion 55 are provided on the entire surface of the base material portion 51. Next, the laser is irradiated to the position on the base material portion 51 where the transmission portion 57 should be formed. The pattern portion 53 and the shielding portion 55 at the position where the laser is irradiated are removed. The positions of the removed pattern portion 53 and the shielding portion 55 become the transmission portion 57. In such a method of forming the transmission portion 57, the cost is increased in proportion to the area to be irradiated with the laser. Therefore, forming the transmissive portion 57 only in the first region 50a is lower in cost than forming the transmissive portion 57 in the first region 50a and the second region 50b.

Alternatively, the transmission portion 57 may be formed as follows. First, the pattern portion 53 and the shielding portion 55 are provided on the entire surface of the base material portion 51. Next, the photoresist is applied to the side where the pattern portion 53 and the shielding portion 55 are provided. After that, a photomask having a hole at a position where the transmission portion 57 should be formed is provided on the photoresist. Ultraviolet rays are irradiated through the photomask. When irradiated with ultraviolet light, the photoresist dissolves in the developer. That is, the photoresist is dissolved in the developing step at the position where the transmissive portion 57 should be formed. Next, it is immersed in an etching solution to remove the pattern portion 53 and the shielding portion 55 at the position where the photoresist is removed. The positions of the removed pattern portion 53 and the shielding portion 55 become the transmission portion 57. In such a method of forming the transmissive portion 57, the cost is proportional to the size of the photomask used and the size of the ultraviolet irradiation device. Therefore, forming the transmissive portion 57 only in the first region 50a is lower in cost than forming the transmissive portion 57 in the first region 50a and the second region 50b.

The method for forming the transmission portion 57 described above is an example, and the transmission portion 57 may be formed by another method.

As described above, the decorative sheet 50 of the present embodiment includes a first region 50a that covers at least the display surface 41 of the display device 40, and a second region 50b that is adjacent to the first region 50a. The pattern portion 53 and the transmission portion 57 which is a non-forming portion of the pattern portion 53 provided at least in the first region 50a are provided, and the ratio of the transmission portion 57 in the first region 50a is the second region. It is higher than the ratio of the transmissive part 57 in 50b, and is the value of L ^* a ^* b ^* in the _{first region 50a, which is the value of L * in the color system, and the value of a * 1} ^{, which is} _the value of a ^{* .} A certain b ^* ₁ and L ^* a ^* b ^* in the second region 50b L ^* ₂ which is the value of L ^* in the color system, a ^{* 2 which is the value of a *, b *} ₂ ^{which is} _the value of b ^* However, the following relationship is satisfied.
((L ^* ₁ -L ^* ₂ ) ² + (a ^* ₁ -a ^* ₂ ) ² + (b ^* ₁ -b ^* ₂ ) ² ) ^1/2 ≤ 3
According to such a decorative sheet 50, by satisfying the above-mentioned relationship, the color difference between the first region 50a facing the display surface 41 and the second region 50b adjacent to the first region 50a can be reduced. It is hardly recognized by the observer. Also, the above relationships can be met at low cost. That is, at low cost, it is possible to make it difficult to recognize the difference in design between the region facing the display surface 41 of the decorative sheet 50 and the region other than the region facing the display surface 41.

It is possible to make various changes to the above-described embodiment.

For example, in the above-described embodiment, the decorative sheet 50 has a base material portion 51. However, the base material portion 51 may be removed from the decorative sheet 50 by peeling it off in the manufacturing process or the like. In this case, the transmission portion 57 may be formed as a through hole of the decorative sheet 50.

Further, in the above-described embodiment, as shown in FIG. 2, the pattern portion 53 of the decorative sheet 50 is arranged on the side where the display device 10 with a panel is observed. However, as shown in FIG. 8, the base material portion 51 of the decorative sheet 50 may be arranged on the side where the display device 10 with a panel is observed. When the base material portion 51 of the decorative sheet 50 is arranged on the side where the display device 10 with a panel is observed, it is less likely that foreign matter adheres to the transmission portion 57 and obstructs the image light.

The above-mentioned display device 10 with a panel is used for an interior member or an exterior member of a moving body such as a vehicle such as an automobile or a railroad, an aircraft, a ship, or a spacecraft. As a specific example, the display device 10 with a panel is used for a center console of an automobile or a door trim. Alternatively, the display device 10 with a panel may be incorporated and used in an interior member or an exterior member of a building, an electronic device, furniture, or an electric appliance.

10 Display device with panel 20 Display device with decorative sheet 30 Panel member 31 Base material layer 35 Design layer 37 Opening 40 Display device 41 Display surface 50 Decorative sheet 50a First area 50b Second area 51 Base material part 53 Picture part 55 Shielding part 57 Transmissive part 60 Halftone dots

Claims (1)

A decorative sheet including at least a first region covering a display surface of a display device and a second region adjacent to the first region.
It is provided with a pattern portion and a transmission portion which is a non-forming portion of the pattern portion provided at least in the first region.
The proportion of the transmissive portion in the first region is higher than the proportion of the transmissive portion in the second region.
L ^* a ^* b ^* in the first region, L ^* ₁ which is the value of L ^* in the color system, a ^{* 1 which is the value of a *, b *} ₁ ^{which is} _the value of b ^* , and the second region. L ^* a ^* b ^* L ^* ₂ , which is the value of L ^* in the color system, a * ₂ , which is the value of a ^* , and b ^* ₂ , which is the value of b ^* , satisfy the following relationship ^. Sheet.
((L ^* ₁ -L ^* ₂ ) ² + (a ^* ₁ -a ^* ₂ ) ² + (b ^* ₁ -b ^* ₂ ) ² ) ^1/2 ≤ 3

Images