Decorative sheet and display device with decorative sheet

Abstract

To enable both sufficiently concealing a display device by a decorative sheet and making it possible to clearly observe an image displayed by the display device through the decorative sheet.SOLUTION: A decorative sheet 20 is disposed facingly to a display device 10. The decorative sheet 20 includes a design layer 30 and a dimming layer 40. The design layer 30 can transmit visible light. The dimming layer 40 is laminated on a side of the design layer 30 which faces to the display device 10. The dimming layer 40 is capable of controlling a visible light transmissivity under voltage application.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a decorative sheet and a display device with a decorative sheet having the decorative sheet. [Background technology]

[0002] Display devices that display images are widely used. When no image is displayed, such display devices are usually observed to be black. On the other hand, design is considered to be extremely important for surface components of automobiles, furniture, housing construction materials, and the like. Currently, display devices applied to such fields are expected not only to simply display images, but also to have a design that blends in with the surrounding environment.

[0003] In order to impart design to a display device, for example, as shown in Patent Document 1, it has been considered to provide a decorative sheet having a design layer in a position facing the display surface of the display device. When a decorative sheet is provided in a position facing the display surface of the display device, the surface of the decorative sheet becomes the surface of the display device with the decorative sheet. By displaying a design by the design layer on the surface of the decorative sheet, the display device with the decorative sheet can be given a design that harmonizes with the surrounding environment. Furthermore, the design layer of the decorative sheet can transmit visible light so that the image light of the display device can pass through the decorative sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-331132 Summary of the Invention [Problem to be solved by the invention]

[0005] It is desirable that the visible light transmittance of the design layer of the decorative sheet is high so that the image light from the display device can be easily observed. However, if the visible light transmittance of the design layer of the decorative sheet is high, the display device can be observed from the outside through the decorative sheet. As a result, it is difficult to both conceal the display device with the decorative sheet to provide a design and to clearly observe the image displayed by the display device through the decorative sheet.

[0006] The present invention has been made with these points in mind, and aims to make it possible to both sufficiently conceal the display device with a decorative sheet and to clearly observe the image displayed by the display device through the decorative sheet. [Means for solving the problem]

[0007] The first decorative sheet of the present invention is a decorative sheet disposed facing a display device, A design layer that is transparent to visible light; a light-controlling layer laminated on the side of the design layer facing the display device, The light-controlling layer can adjust the visible light transmittance by applying a voltage.

[0008] In the first decorative sheet of the present invention, L * a * b * The lightness L1 of the design layer in the color system is 35 or less, L when the visible light transmittance of the light-controlling layer is adjusted to the lowest * a * b * The lightness L2 of the light-modulating layer in a color system may be 35 or less.

[0009] In the first decorative sheet of the present invention, when the visible light transmittance of the light-controlling layer is adjusted to the lowest, L * a * b * The difference in lightness ΔL between the design layer and the light-control layer in the color system *may be 25 or less.

[0010] In the first decorative sheet of the present invention, when the visible light transmittance of the light-controlling layer is adjusted to the lowest, L * a * b * Color difference ΔE between the design layer and the light-control layer in the color system * ab may be 45 or less.

[0011] In the first decorative sheet of the present invention, the visible light transmittance of the decorative sheet may be 10% or less when the visible light transmittance of the light control layer is adjusted to the lowest value.

[0012] In the first decorative sheet of the present invention, the difference between the visible light transmittance of the decorative sheet when the visible light transmittance of the light-controlling layer is adjusted to the lowest and the visible light transmittance of the decorative sheet when the visible light transmittance of the light-controlling layer is adjusted to the highest may be 10% or more.

[0013] The second decorative sheet of the present invention is a decorative sheet disposed facing a display device, A design layer that is transparent to visible light; a light-controlling layer laminated on the side of the design layer facing the display device, The haze value of the light-controlling layer can be adjusted by applying a voltage.

[0014] In the second decorative sheet of the present invention, L * a * b * The lightness L1 of the design layer in the color system is 35 or more, L when the haze value of the light-controlling layer is adjusted to the highest value * a * b * The lightness L2 of the light-modulating layer in a color system may be 35 or more.

[0015] In the second decorative sheet of the present invention, when the haze value of the light-controlling layer is adjusted to the highest value, L * a* b * The difference in lightness ΔL between the design layer and the light-control layer in the color system * may be 25 or less.

[0016] In the second decorative sheet of the present invention, when the haze value of the light-controlling layer is adjusted to the highest value, L * a * b * Color difference ΔE between the design layer and the light-control layer in the color system * ab may be 45 or less.

[0017] In the second decorative sheet of the present invention, the haze value of the decorative sheet may be 70% or more when the haze value of the light-controlling layer is adjusted to the highest value.

[0018] In the second decorative sheet of the present invention, the difference between the haze value of the decorative sheet when the haze value of the light-controlling layer is adjusted to the highest and the haze value of the decorative sheet when the haze value of the light-controlling layer is adjusted to the lowest may be 60% or more.

[0019] In the first or second decorative sheet of the present invention, the design layer may have a visible light transmittance of 20% or more.

[0020] In the first or second decorative sheet of the present invention, the design layer may have a picture portion forming a picture, and a transparent portion where the picture portion is not formed.

[0021] In the first or second decorative sheet of the present invention, the design layer may have a pattern portion that forms a pattern, a shading portion that is arranged on the display device side of the pattern portion, and a transparent portion that is not formed by the pattern portion or the shading portion.

[0022] The first display device with a decorative sheet of the present invention is a display device for displaying information; and any one of the decorative sheets described above, which is arranged facing the display device.

[0023] The second display device with a decorative sheet of the present invention is a display device for displaying information; a decorative sheet disposed facing the display device; a light-controlling layer disposed between the display device and the decorative sheet, The decorative sheet has a design layer that is transparent to visible light, The light-controlling layer can adjust the visible light transmittance or haze value by applying a voltage.

[0024] In the first or second display device with a decorative sheet of the present invention, the light-controlling layer may be transparent when the display device is in a display state, and non-transparent when the display device is in a non-display state.

[0025] In the first or second display device with a decorative sheet of the present invention, the display device includes a light-emitting region and a non-light-emitting region adjacent to the light-emitting region; The light-modulating layer may cover the boundary between the light-emitting region and the non-light-emitting region. [Effects of the Invention]

[0026] According to the present invention, it is possible to both sufficiently conceal the display device with the decorative sheet and clearly display the image displayed by the display device through the decorative sheet. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is an exploded perspective view that schematically shows a display device with a decorative sheet. [Figure 2] FIG. 2 is a cross-sectional view of a display device with a decorative sheet. [Figure 3] FIG. 3 is an enlarged front view of a part of the decorative sheet. [Figure 4] FIG. 4 is a cross-sectional view showing a specific example of the light-controlling layer. [Figure 5] FIG. 5 is a cross-sectional view showing another specific example of the light-controlling layer. [Figure 6] FIG. 6 is a front view showing a display device with a decorative sheet in a state where an image is displayed on the display surface. [Figure 7] FIG. 7 is a front view showing a display device with a decorative sheet in a state where no image is displayed on the display surface. [Figure 8] FIG. 8 is a front view showing a conventional display device with a decorative sheet in a state where no image is displayed on the display surface. [Figure 9] FIG. 9 is a cross-sectional view showing a modified example of a display device with a decorative sheet. DETAILED DESCRIPTION OF THE INVENTION

[0028] An embodiment of the present invention will be described below with reference to the drawings. In the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of ease of illustration and understanding.

[0029] In this specification, the terms "layer," "sheet," and "film" are not distinguished from one another solely based on the difference in name. For example, the term "layer" is a concept that includes members that can be called sheets or films.

[0030] Furthermore, terms used in this specification that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values of lengths and angles, are not to be construed as being bound by strict meanings, but rather as including a range within which similar functions can be expected.

[0031] Fig. 1 is an exploded perspective view schematically showing a display device 1 with a decorative sheet according to one embodiment of the present invention. As shown in Fig. 1, the display device 1 with a decorative sheet includes a display device 10 having a display surface 11, and a decorative sheet 20 arranged opposite the display surface 11 of the display device 10. In the display device 1 with a decorative sheet, the decorative sheet 20 is arranged so that the side on which a light-controlling layer 40 (described later) is provided faces the display device 10. In the illustrated example, the display device 1 with a decorative sheet is shown as being flat, but the display device 1 with a decorative sheet may also be curved by curving each component of the display device 1 with a decorative sheet.

[0032] Display device 10 is a device that emits image light, and has a display surface 11 on one side from which the image light can be emitted. Display device 10 can display information using the image light. Display device 10 also includes a light-emitting region 15 that emits light and a non-light-emitting region 16 that does not emit light. Non-light-emitting region 16 is adjacent to light-emitting region 15, and particularly surrounds light-emitting region 15. When light-emitting region 15 emits light, the emitted light is emitted from display surface 11 as image light.

[0033] Any display device that displays images, such as a liquid crystal display, a plasma display, or an organic EL display, can be used as display device 10. Display surface 11 of such display device 10 is typically a glass surface. In this case, information displayed by display device 10 is formed by light-emitting region 15, and non-light-emitting region 16 is formed by an outer frame portion, such as a bezel, that surrounds light-emitting region 15.

[0034] Alternatively, the display device 10 may display an image by transmitting light through a printed transparent film or the like, or may display an image using light and dark by blocking part of the light with a light-shielding object. In this case, the display device 10 includes a light source that emits light and a predetermined pattern portion, such as a transparent film printed with a pattern corresponding to the image to be displayed or a light-shielding object shaped to match the image to be displayed. The surface of the transparent film or the non-formed portion of the light-shielding object serves as the display surface 11. Preferably, the light source is a surface light source device that emits light in a planar manner, for example, to ensure uniform intensity of light transmitted through the predetermined pattern portion. In this case, the information displayed by the display device 10 is formed by a combination of the light-emitting region 15 and the non-light-emitting region 16. That is, the display surface 11 is formed by the light-emitting region 15 and the non-light-emitting region 16.

[0035] The decorative sheet 20 is disposed facing the display surface 11 of the display device 10, and covers at least the entire display surface 11 so that the display surface 11 cannot be directly observed from the outside. The decorative sheet 20 has dimensions equal to or greater than the dimensions of the display surface 11 so that it can cover the entire display surface 11 of the display device 10. In the example shown in FIG. 1, the decorative sheet 20 is a flat member that extends overall in the same direction as the display surface 11 of the display device 10. The thickness of the decorative sheet 20 is, for example, 20 μm or more and 550 μm or less.

[0036] The decorative sheet 20 displays a design and imparts design to the display device 1 with the decorative sheet. The decorative sheet 20 has a base layer 21, a design layer 30 laminated on the base layer 21, and a light-controlling layer 40 laminated on the side of the design layer 30 facing the display device 10. In the example shown in Fig. 2, the design layer 30 is provided on one surface of the base layer 21, and the light-controlling layer 40 is provided on the other surface of the base layer 21. However, this is not limited to the example shown, and the light-controlling layer 40 may be provided separate from the base layer 21 so as to be a separate entity.

[0037] The base layer 21 appropriately supports the design layer 30 and the photochromic layer 40 laminated thereon. The base layer 21 is a transparent film-like member. The base layer 21 may be made of any material that transmits visible light and can appropriately support the design layer 30 and the photochromic layer 40, and examples of the material include polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, cyclic polyolefin, and ABS (acrylonitrile butadiene styrene copolymer). In addition, in consideration of visible light transmittance and appropriate support for the design layer 30 and the photochromic layer 40, the base layer 21 preferably has a thickness of 10 μm or more and 500 μm or less.

[0038] Here, "transparent" means that the visible light transmittance, specified as the average value of the transmittance at each wavelength, is 80% or more when measured using a spectrophotometer (Shimadzu Corporation's "UV-3100PC," compliant with JIS K 0115) within the measurement wavelength range of 380 nm to 780 nm.

[0039] The design layer 30 forms the design displayed by the decorative sheet 20. The design layer 30 can form designs such as figures, patterns, designs, colors, pictures, photographs, characters, marks, letters, and numbers. In particular, examples of designs that can harmonize with the surrounding environment in which the display device 1 with the decorative sheet is installed include wood grain and marble patterns and geometric patterns. The design formed by the design layer 30 is preferably expressed in multiple colors. However, the design formed by the design layer 30 may also be a design formed by printing a single color solidly.

[0040] In the example shown in FIG. 2 , the design layer 30 includes a pattern portion 31 that forms a design image, a light-shielding portion 33 that is located closer to the display device 10 than the pattern portion 31, and a transparent portion 35 that is a non-formation portion of the pattern portion 31 and the light-shielding portion 33. The illustrated example is not limited to this, and the light-shielding portion 33 may be omitted. The transparent portion 35 allows visible light to pass through the design layer 30. The image displayed on the display device 10 through the decorative sheet 20 is observed by an external observer as the image light passes through the transparent portion 35. However, the illustrated example is not limited to this, and the design layer 30 may be a translucent layer with a design image. That is, the design layer 30 may be capable of semi-transmitting light at each position and displaying a design formed as a pattern at each position. The visible light transmittance of the design layer 30 is preferably 20% or more, more preferably 25% or more, and even more preferably 30% or more.

[0041] The picture portion 31 forms a picture as a design formed by the design layer 30. If the picture portion 31 is sufficiently thick, the picture formed by the picture portion 31 can be made thick and clear. Here, the thickness of the picture portion 31 refers to the length of the picture portion 31 along the normal direction of the base layer 21 that supports the picture portion 31. As a specific example, the thickness of the picture portion 31 is preferably 1 μm or more and 20 μm or less. Note that the cross-sectional shape of the picture portion 31 in a cross section perpendicular to the sheet surface of the decorative sheet 20 as shown in FIG. 2 is rectangular, but it is not limited to this and may be trapezoidal, etc.

[0042] The light-shielding portion 33 is provided so as to cover the picture portion 31 from the side facing the display device 10, i.e., the side of the base layer 21 in the example shown in FIG. 2. The light-shielding portion 33 has a light-absorbing function to prevent image light from the display device 10 from entering the picture portion 31. The light-shielding portion 33 may contain, for example, light-absorbing particles in a binder resin. Examples of light-absorbing particles include black pigments such as carbon black and titanium black. Preferably, the light-shielding portion 33 is provided only in a position facing the picture portion 31 so that the light-shielding portion 33 does not prevent the image light emitted from the display device 10 from passing through the transmission portion 35. Furthermore, if the light-shielding portion 33 is sufficiently thick to cover the picture portion 31, the picture formed by the picture portion 31 can be formed thick and clearly. As a specific example, the thickness of the light-shielding portion 33 is 1 μm or more and 20 μm or less.

[0043] The transmissive portions 35 are provided to transmit the image light from the display device 10 to the design layer 30. As shown in Figures 2 and 3, the transmissive portions 35 are portions where the picture portions 31 and the light-shielding portions 33 are not formed when the decorative sheet 20 is observed from the front. In order to sufficiently transmit the image light from the display device 10, the area of the decorative sheet 20 occupied by the transmissive portions 35 is preferably 20% or more, more preferably 25% or more, and even more preferably 30% or more.

[0044] In the example shown in FIG. 3 , multiple transmissive portions 35 are spaced apart from one another. A pattern portion 31 is formed between each of the transmissive portions 35. In the illustrated example, each transmissive portion 35 is circular in front view, and the multiple transmissive portions 35 are arranged in a square lattice pattern. When each transmissive portion 35 is circular, unintended diffusion of image light passing through the transmissive portions 35 can be suppressed. Furthermore, when the transmissive portions 35 are arranged in a lattice pattern, particularly a square lattice pattern, the image light from the display device 10 can be uniformly transmitted, making it less likely that unevenness will occur in the image light. However, the transmissive portions 35 are not limited to the illustrated example and may have any shape or be arranged in any position.

[0045] 2, the transmissive portion 35 may be a hole or a void, or may be formed of, for example, a transparent resin. Furthermore, the transparent resin may be formed so as to cover not only the transmissive portion 35 but also the picture portion 31 and the light-shielding portion 33 from the side opposite to the side on which the base layer 21 is provided. Such a transparent resin can form the transmissive portion 35 and also function as a transparent protective film that protects the picture portion 31 and the light-shielding portion 33.

[0046] The transparent portions 35 are formed, for example, by irradiating a laser onto the positions where the transparent portions 35 are to be formed on the pattern portions 31 and the light-shielding portions 33 provided on the entire surface of the base layer 21, and removing the pattern portions 31 and the light-shielding portions 33 at the positions irradiated with the laser. Note that the method for forming the transparent portions 35 is an example, and the transparent portions 35 may be formed by other methods.

[0047] The photochromic layer 40 can be switched between a transparent state and a non-transparent state (hiding state). The photochromic layer 40 adjusts the state of incident light. Specifically, it adjusts the brightness of light that passes through the photochromic layer 40. Alternatively, it adjusts the diffusivity of light that passes through the photochromic layer 40. That is, the photochromic layer 40 is capable of adjusting its visible light transmittance and haze value. By adjusting the visible light transmittance of the photochromic layer 40 to a high value or adjusting the haze value to a low value, the photochromic layer 40 can be made transparent. By adjusting the visible light transmittance of the photochromic layer 40 to a low value or adjusting the haze value to a high value, the photochromic layer 40 can be made non-transparent. In addition, in the transparent state, the photochromic layer 40 can transmit image light from the display device 10 located behind it, and in the non-transparent state, it can conceal the display device 10 located behind it. Therefore, it is preferable that the photochromic layer 40 be transparent when the display device 10 is in a displaying state and non-transparent when the display device 10 is in a non-displaying state.

[0048] For example, the dimming layer 40 includes a liquid crystal layer 41 that drives liquid crystal in a VA (Vertical Alignment) mode, a TN (Twisted Nematic) mode, an IPS (In Plane Switching) mode, or an FFS (Fringe Field Switching) mode, and a pair of polarizing plates 44, so that the dimming layer 40 can adjust the visible light transmittance by applying a voltage.

[0049] FIG. 4 is a cross-sectional view showing a specific example of a light-controlling layer 40 capable of adjusting visible light transmittance. In the example shown in FIG. 4, the light-controlling layer 40 includes a liquid crystal layer 41 containing liquid crystals, a pair of alignment films 42 disposed on both sides of the liquid crystal layer 41 and exerting an alignment regulating force on the liquid crystal in the liquid crystal layer 41, a pair of electrode layers 43 disposed on both sides of the pair of alignment films 42, a pair of substrates 45 disposed on both sides of the pair of electrode layers 43, and a pair of polarizers 44 disposed in a crossed Nicol or parallel Nicol configuration on both sides of the pair of substrates 45. In the light-controlling layer 40 shown in FIG. 4, when no voltage is applied to the pair of electrode layers 43, the liquid crystal in the liquid crystal layer 41 is controlled by the alignment regulating force from the alignment films 42. On the other hand, when a voltage is applied to the pair of electrode layers 43, the liquid crystal in the liquid crystal layer 41 is controlled by the electric field formed between the pair of electrode layers 43. Therefore, the orientation of the liquid crystal in the liquid crystal layer 41 can be controlled by the presence or absence of a voltage and the magnitude of the applied voltage, and as a result, the polarization state of light passing through the liquid crystal layer 41 can be controlled. Then, by adjusting the polarization state of light that has passed through one polarizing plate 44, it is possible to control whether or not the light passes through the other polarizing plate 44. In this way, the visible light transmittance of the switchable layer 40 shown in Fig. 4 can be adjusted by whether or not a voltage is applied and the magnitude of the applied voltage.

[0050] As another example, the photochromic layer 40 may contain a polymer dispersed liquid crystal (PDLC) having liquid crystals dispersed in a polymer, or a polymer network liquid crystal (PNLC) having liquid crystals disposed in voids formed within a polymer network made of a resin formed into a three-dimensional mesh, thereby making it possible to adjust the haze value of the photochromic layer 40 by applying a voltage. Furthermore, the photochromic layer 40 may contain a chromatic dichroic dye, which allows the photochromic layer 40 to have a chromatic color when in a non-transparent state. The chromatic color exhibited by the dichroic dye in the photochromic layer 40 is preferably a color that matches the design formed by the design layer 30.

[0051] FIG. 5 is a cross-sectional view showing a specific example of a light-controlling layer 40 with an adjustable haze value. In the example shown in FIG. 5, the light-controlling layer 40 includes a liquid crystal layer 41 containing a polymer-dispersed liquid crystal, a pair of electrode layers 43 disposed on both sides of the liquid crystal layer 41, and a pair of substrates 45 disposed on both sides of the pair of electrode layers 43. The polymer-dispersed liquid crystal includes a polymer 48 made of a cured resin, a liquid crystal material 46 in a space formed in the polymer 48, and liquid crystal molecules 47 dispersed in the polymer 48. The space containing the liquid crystal material 46 is dispersed within the polymer 48. In the light-controlling layer 40 shown in FIG. 5, when no voltage is applied to the pair of electrode layers 43, the liquid crystal molecules 47 are aligned along the wall surfaces of the polymer 48 that form the space containing the liquid crystal material 46. In other words, the liquid crystal molecules 47 are not aligned. The refractive index of the liquid crystal molecules 47 in the short direction is different from the refractive index of the liquid crystal material 46. Therefore, light passing through the light-controlling layer 40 is refracted due to the difference in refractive index between the liquid crystal material 46 and the liquid crystal molecules 47. Because the interface between the liquid crystal material 46 and the liquid crystal molecules 47 is irregularly formed, light is refracted in irregular directions. In other words, light passing through the switchable layer 40 is diffused. Thus, when no voltage is applied, the switchable layer 40 is in a high-haze state, diffusing the transmitted light and making it opaque. On the other hand, when a voltage is applied, the liquid crystal molecules 47 are aligned along the direction of the electric field generated by the application of voltage in the space containing the liquid crystal material 46. In other words, the liquid crystal molecules 47 are aligned. The refractive index of the liquid crystal molecules 47 in the longitudinal direction is the same as the refractive index of the liquid crystal material 46. Therefore, light passing through the switchable layer 40 is not refracted, and therefore is not diffused. Thus, when a voltage is applied, the switchable layer 40 is in a low-haze state and is transparent. The haze value of the switchable layer 40 can be adjusted by applying or not applying a voltage and the magnitude of the applied voltage.

[0052] The visible light transmittance is specified as the average value of the transmittance at each wavelength when measured using a spectrophotometer (Shimadzu Corporation's "UV-3100PC," compliant with JIS K 0115) within the measurement wavelength range of 380 nm to 780 nm. The haze value is expressed as the ratio of the diffuse transmittance to the total light transmittance of the object, and refers to the diffusion rate of light that passes through the object. The total light transmittance is the ratio of the amount of light that passes through the object to the amount of light that enters the object. The diffuse transmittance is the ratio of the amount of light that passes through the object in directions other than the straight-through direction to the amount of light that enters the object, i.e., the amount of light that is diffused and transmitted. The total light transmittance and diffuse transmittance are measured using a haze meter (for example, Murakami Color Research Laboratory, product number: HM-150) that complies with JIS K 7361. will be .

[0053] For example, when the design formed by the design layer 30 is relatively close to black, specifically, L * a * b * When the lightness L1 of the design layer 30 in the color system is 35 or less, the lightness of the light-controlling layer 40 is preferably adjusted to a color close to black. That is, the light-controlling layer 40 is capable of adjusting the visible light transmittance by applying a voltage. In particular, the lightness L1 of the light-controlling layer 40 is preferably adjusted to a color close to black when the visible light transmittance is low. * a * b * The lightness L2 of the light-controlling layer 40 in the color system is preferably 35 or less, and more preferably 25 or less.

[0054] On the other hand, for example, when the design formed by the design layer 30 is relatively close to white, specifically, L * a * b *When the lightness L1 of the design layer 30 in the color system is 35 or more, the lightness L1 of the photochromic layer 40 can be adjusted to a color close to white, thereby adjusting the diffusivity of light to be transmitted. That is, the photochromic layer 40 can adjust the haze value by applying a voltage. In particular, the L1 can be adjusted so that the photochromic layer 40 can adjust the color close to white while maintaining a high haze value. * a * b * The lightness L2 of the light-controlling layer 40 in the color system is preferably 35 or more, and more preferably 45 or more.

[0055] In addition, L * a * b * L in color space * , a * , b * Each value is measured by the reflected light from the object using a spectrophotometer (Konica Minolta "CM-700d"), for example. do In addition, the L of the design layer 30 and the light-control layer 40 * , a * , b * Each value of L means the average value for the entire design layer 30 or the light-controlling layer 40. For example, L is measured at several random points or several equally spaced points on the design layer 30 or the light-controlling layer 40. * , a * , b * By measuring each value and taking the average, the overall average of the design layer 30 and the light-control layer 40 can be calculated. do In addition, the L of the design layer 30 and the light-control layer 40 * , a * , b * The values of L and L are measured without being affected by the decorative sheet 20 or other components of the display device 1 with the decorative sheet. * , a * , b * Each value is measured with the design layer 30 separated from the decorative sheet 20 (base layer 21), or with a portion of the design layer 30 sufficiently enlarged.

[0056] In order to prevent the photochromic layer 40 from interfering with the design formed by the design layer 30, it is preferable that the difference in brightness or color between the design layer 30 and the photochromic layer 40 is small when the photochromic layer 40 is in a non-transparent state, that is, when the visible light transmittance of the photochromic layer 40 is adjusted to the lowest or when the haze value is adjusted to the highest. Specifically, when the visible light transmittance of the photochromic layer 40 is adjusted to the lowest or when the haze value is adjusted to the highest, * a * b * The difference in lightness ΔL between the design layer 30 and the light-control layer 40 in the color system * is preferably 25 or less, more preferably 20 or less. In addition, when the visible light transmittance of the light-controlling layer 40 is adjusted to the lowest or the haze value is adjusted to the highest, L * a * b * Color difference ΔE between the design layer 30 and the light-control layer 40 in the color system * ab is preferably 45 or less, and more preferably 35 or less. * ab means L * a * b * It refers to the distance in the color space of the color system.

[0057] When the light-switching layer 40 is in a non-transparent state, it is preferable that the display device 10 is prevented from being observed through the decorative sheet 20. Specifically, if the visible light transmittance of the light-switching layer 40 is adjustable, the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the light-switching layer 40 is adjusted to its lowest is preferably 10% or less, and more preferably 5% or less. Furthermore, if the haze value of the light-switching layer 40 is adjustable, the haze value of the decorative sheet 20 when the haze value of the light-switching layer 40 is adjusted to its highest is preferably 70% or more, and more preferably 80% or more.

[0058] Furthermore, it is preferable that the image light from the display device 10 through the decorative sheet 20 when the dimming layer 40 is in a transparent state and the design formed by the design layer 30 of the decorative sheet 20 when the dimming layer 40 is in a non-transparent state are observed to be clearly different. For this reason, if the visible light transmittance of the dimming layer 40 is adjustable, it is preferable that there is a large difference between the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the dimming layer 40 is adjusted to its lowest state and the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the dimming layer 40 is adjusted to its highest state. Specifically, if the visible light transmittance of the dimming layer 40 is adjustable, the difference between the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the dimming layer 40 is adjusted to its lowest state and the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the dimming layer 40 is adjusted to its highest state is preferably 10% or more, and more preferably 15% or more. Alternatively, when the haze value of the photochromic layer 40 is adjustable, it is preferable that there is a large difference between the haze value of the decorative sheet 20 when the haze value of the photochromic layer 40 is adjusted to the lowest and the haze value of the decorative sheet 20 when the haze value of the photochromic layer 40 is adjusted to the highest. Specifically, when the haze value of the photochromic layer 40 is adjustable, the difference between the haze value of the decorative sheet 20 when the haze value of the photochromic layer 40 is adjusted to the lowest and the haze value of the decorative sheet 20 when the haze value of the photochromic layer 40 is adjusted to the highest is preferably 60% or more, and more preferably 70% or more.

[0059] The light-controlling layer 40 is provided at a position overlapping at least the transmissive portion 35 so as to act on light transmitted through the design layer 30. However, if multiple light-controlling layers 40 are provided independently on the decorative sheet 20, color differences may occur among the individual light-controlling layers 40, which may impair the appearance of the decorative sheet 20. Furthermore, providing wiring for applying voltage to multiple light-controlling layers 40 may be cumbersome. For this reason, it is preferable that one or several, for example, five or fewer, light-controlling layers 40 are provided over the entire surface of the decorative sheet 20. Furthermore, it is preferable that the light-controlling layer 40 cover the boundary 17 between the luminescent region 15 and the non-luminescent region 16 of the display device 10. In particular, when the decorative sheet 20 has multiple light-controlling layers 40, it is preferable that one light-controlling layer 40 cover the entire boundary 17 between the luminescent region 15 and the non-luminescent region 16 of the display device 10. In other words, it is preferable that the boundary between the light-controlling layers 40 does not overlap the luminescent region 15. The light-controlling layer 40 is a thin film member having a thickness of, for example, 0.2 mm to 10 mm. A wide variety of liquid crystal materials can be used as the material for the light-controlling layer 40, such as the liquid crystal compounds described in JP-A-2003-366484 and MLC2166 manufactured by Merck.

[0060] Next, the operation of the display device 1 with the decorative sheet of this embodiment will be described.

[0061] When the display device 10 displays an image on the display surface 11, the light-controlling layer 40 is in a transparent state. That is, the light-controlling layer 40 is in a state where the visible light transmittance is high or the haze value is low. The image light is transmitted through the light-controlling layer 40 of the decorative sheet 20, the base layer 21, and the transmissive portion 35 of the design layer 30. This allows the viewer to view the image, as shown in FIG. 6. That is, the display device 1 with the decorative sheet can display the image that is intended to be viewed, and an external viewer can view the image.

[0062] Furthermore, the picture portion 31 is covered from the side of the display device 10 by the light-shielding portion 33. Therefore, the light-shielding portion 33 prevents the image light from entering the picture portion 31. This prevents the image light from passing through the picture portion 31 and the picture represented by the picture portion 31 from being mixed with the image light and observed. In other words, it is possible to effectively prevent degradation of the color reproducibility of the image caused by the absorption of visible light in a specific wavelength range by the picture portion 31. Furthermore, when the light-shielding portion 33 is provided only in the area facing the picture portion 31, the light-shielding portion 33 prevents the image light from being blocked from passing through the transmission portion 35. In other words, the image light can be efficiently used to display a bright image.

[0063] When no image is displayed on the display surface 11 of the display device 10, the light-controlling layer 40 is in a non-transparent state. That is, the light-controlling layer 40 has a low visible light transmittance or a high haze value. At this time, as shown in FIG. 7 , the pattern formed by the pattern portion 31 of the decorative sheet 20 is displayed as a design. That is, the display device 1 with the decorative sheet can display a pattern that is intended to be observed. The displayed pattern prevents the display surface 11 of the display device 10 from being observed by an external observer, allowing the display device 1 with the decorative sheet to blend in with the surrounding environment in terms of design. In particular, when the light-shielding portion 33 is provided only in a position facing the pattern portion 31, the light-shielding portion 33 is not visible to the observer, preventing the light-shielding portion 33 from impairing the design of the decorative sheet 20.

[0064] As described above, it is desirable to increase the visible light transmittance of the design layer of the decorative sheet so that the image light from the display device can be easily observed when the display device is displaying an image. In a display device with a decorative sheet, increasing the visible light transmittance of the design layer increases the amount of image light that passes through the decorative sheet, making the image light from the display device more easily observable. However, in a conventional decorative sheet that does not have a dimming layer, increasing the visible light transmittance of the design layer results in the display device being observed through the decorative sheet even when the display device is not displaying an image. In other words, it is difficult to achieve both sufficient concealment of the display device by the decorative sheet and clear observation of the image displayed by the display device through the decorative sheet.

[0065] On the other hand, the decorative sheet 20 of this embodiment has a light-controlling layer 40 that can be switched between a transparent state and a non-transparent state. The light-controlling layer 40 has a visible light transmittance or haze value that can be adjusted by applying a voltage to switch between the transparent state and the non-transparent state. By making the light-controlling layer 40 transparent when the display device 10 displays an image, specifically by increasing the visible light transmittance or decreasing the haze value, an external observer can clearly observe the image from the display device 10 without being obstructed by the light-controlling layer 40. Furthermore, by making the light-controlling layer 40 non-transparent when the display device 10 does not display an image, specifically by decreasing the visible light transmittance or increasing the haze value of the light-controlling layer 40, the display device 10 can be sufficiently concealed by the light-controlling layer 40. Thus, the decorative sheet 20 of this embodiment can both sufficiently conceal the display device 10 and clearly observe the image displayed by the display device 10 through the decorative sheet 20.

[0066] In addition, when the visible light transmittance of the light-controlling layer 40 is adjusted to the lowest value, L * a * b * When the lightness L1 of the design layer 30 in the color system is 35 or less, L * a* b * The lightness L2 of the light-controlling layer 40 in the color system is 35 or less. Alternatively, when the haze value of the light-controlling layer 40 is adjusted to the highest value, L * a * b * When the lightness L1 of the design layer 30 in the color system is 35 or more, L * a * b * The lightness L2 of the photochromic layer 40 in the color space is 35 or greater. In other words, if the design formed by the design layer 30 is a dark color, the photochromic layer 40 is also a dark color. Alternatively, if the design formed by the design layer 30 is a light color, the photochromic layer 40 is also a light color. In this way, the similarity in brightness between the design layer 30 and the photochromic layer 40 makes it less likely that the photochromic layer 40 will interfere with the design formed by the design layer 30.

[0067] Furthermore, if there is a large difference in brightness between the design by the design layer 30 of the decorative sheet 20 displayed in the image non-display state of the display device 10 and the light-controlling layer 40 in the non-transparent state, the light-controlling layer 40 will stand out and may obstruct the design formed by the design layer 30. However, in this embodiment, when the light-controlling layer 40 is in the non-transparent state, that is, when the visible light transmittance is adjusted to the lowest or when the haze value is adjusted to the highest, L * a * b * The difference in lightness ΔL between the design layer 30 and the light-control layer 40 in the color system * is 25 or less. When the difference in lightness between the design layer 30 and the photochromic layer 40 is sufficiently small, the photochromic layer 40 is inconspicuous and is less likely to interfere with the design formed by the design layer 30.

[0068] Furthermore, if there is a large difference in color between the design by the design layer 30 of the decorative sheet 20 displayed when the display device 10 is in an image non-display state and the light-controlling layer 40 in a non-transparent state, the color of the design formed by the design layer 30 and the color of the light-controlling layer 40 may be mixed, which may impair the design formed by the design layer 30. However, in the non-transparent state of the light-controlling layer 40, that is, in the state where the visible light transmittance is adjusted to the lowest or the haze value is adjusted to the highest, L * a * b * Color difference ΔE between the design layer 30 and the light-control layer 40 in the color system * ab is equal to or less than 45. By making the color difference between the design layer 30 and the photochromic layer 40 sufficiently small, it becomes difficult to notice a mixture of the color of the design formed by the design layer 30 and the color of the photochromic layer 40, and the design formed by the design layer 30 can be easily observed without being impaired.

[0069] Furthermore, when the visible light transmittance of the light-switching layer 40 is adjusted to its lowest, the visible light transmittance of the decorative sheet 20 is 10% or less. Alternatively, when the haze value of the light-switching layer 40 is adjusted to its lowest, the haze value of the decorative sheet 20 is 70% or more. Because the light-switching layer 40 is sufficiently opaque, the display device 10 is difficult to observe through the decorative sheet 20 having the light-switching layer 40.

[0070] Furthermore, the difference between the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the light-switching layer 40 is adjusted to its lowest and the visible light transmittance of the decorative sheet 20 when the visible light transmittance of the light-switching layer 40 is adjusted to its highest is 10% or more. Alternatively, the difference between the haze value of the decorative sheet 20 when the haze value of the light-switching layer 40 is adjusted to its lowest and the haze value of the decorative sheet 20 when the haze value of the light-switching layer 40 is adjusted to its highest is 60% or more. In this way, because the difference between the transparent and non-transparent states of the light-switching layer 40 is large, the image light from the display device 10 passing through the decorative sheet 20 when the light-switching layer 40 is in the transparent state and the design formed by the design layer 30 of the decorative sheet 20 when the light-switching layer 40 is in the non-transparent state can be observed to be clearly different.

[0071] Furthermore, in this embodiment, the visible light transmittance of the design layer 30 is 20% or more. In conventional display devices with a decorative sheet, if the visible light transmittance of the design layer 30 is 20% or more, the design formed by the design layer becomes thin, and the display device can be observed from the outside through the decorative sheet. However, according to this embodiment, the visible light transmittance of the design layer 30 can be increased so that the image displayed on the display device 10 can be clearly observed through the decorative sheet 20 while the display device 10 is sufficiently concealed by the decorative sheet 20. Specifically, in this embodiment, the visible light transmittance of the design layer 30 can be made 20% or more. This allows more image light from the display device 10 to pass through the decorative sheet 20.

[0072] Furthermore, in the image non-display state of the display device 110 in the conventional display device with a decorative sheet shown in Fig. 8, the boundary 117 between the luminescent region 115 and the non-luminescent region 116 of the display device 110 becomes conspicuous due to differences in appearance, such as color and gloss, between the luminescent region 115 and the non-luminescent region 116. On the other hand, in the display device 1 with a decorative sheet of the present embodiment, the light-adjusting layer 40 covers the boundary 17 between the luminescent region 15 and the non-luminescent region 16. When the display device 10 is in the image non-display state, the light-adjusting layer 40 becomes opaque, making it difficult to distinguish between the luminescent region 15 and the non-luminescent region 16, which are covered by the light-adjusting layer 40. As a result, the boundary 17 between the luminescent region 15 and the non-luminescent region 16 becomes less conspicuous.

[0073] As described above, the decorative sheet 20 of the present embodiment is a decorative sheet disposed facing the display device 10 and includes a design layer 30 capable of transmitting visible light and a light-controlling layer 40 laminated on the side of the design layer 30 facing the display device 10. The light-controlling layer 40 has a visible light transmittance or haze value that can be adjusted by applying a voltage. With this decorative sheet 20, the display device 10 can be sufficiently concealed by the decorative sheet 20 by making the light-controlling layer 40 opaque when the display device 10 is not displaying an image. Furthermore, when the display device 10 displays an image, the visible light transmittance of the design layer 30 can be increased so that image light from the display device 10 is sufficiently transmitted through the decorative sheet 20. In this way, the present embodiment allows the decorative sheet 20 to both sufficiently conceal the display device 10 and clearly observe the image displayed by the display device 10 through the decorative sheet 20.

[0074] The decorative sheet 20 and the display device 1 with the decorative sheet 20 described above are used as interior or exterior components for moving objects such as automobiles, trains, airplanes, ships, and spacecraft. As a specific application example, the decorative sheet 20 and the display device 1 with the decorative sheet 20 are used in the center console or door trim of an automobile. Alternatively, the decorative sheet 20 and the display device 1 with the decorative sheet 20 may be incorporated into interior or exterior components for a building, electronic equipment, furniture, or electrical appliances.

[0075] The aspects of the present invention are not limited to the individual embodiments described above, but include various modifications that may be conceived by those skilled in the art, and the effects of the present invention are not limited to the above-described contents. In other words, various additions, modifications, and partial deletions are possible within the scope of the conceptual idea and spirit of the present invention that can be derived from the contents defined in the claims and their equivalents.

[0076] For example, as shown in FIG. 9 , the light-controlling layer 40 may be a separate component independent of the decorative sheet 20. That is, in the example shown in FIG. 9 , the display device 1 with the decorative sheet includes a display device 10 that displays information, a decorative sheet 20 that faces the display device 10, and a light-controlling layer 40 that is disposed between the display device 10 and the decorative sheet 20. Similarly to the above-described embodiment, the decorative sheet 20 has a design layer 30 that can transmit visible light, and the visible light transmittance or haze value of the light-controlling layer 40 can be adjusted by applying a voltage. In this type of display device 1 with the decorative sheet, adjusting the visible light transmittance or haze value of the light-controlling layer 40 makes it possible to both sufficiently conceal the display device 10 with the decorative sheet 20 and clearly observe an image displayed by the display device 10 through the decorative sheet 20. [Explanation of symbols]

[0077] 1 Display device with decorative sheet 10 Display device 11 Display surface 15 Light-emitting area 16 Non-luminous area 17 Boundary 20 Decorative sheet 21 Base material layer 30 Design Layer 31 Picture section 33 Light blocking section 35 Transparent part 40 Photochromic Layer

Claims

1. A decorative sheet disposed facing a display device, A design layer that is transparent to visible light; a light-controlling layer laminated on the side of the design layer facing the display device, the light-controlling layer is capable of adjusting the visible light transmittance by applying a voltage, thereby being switchable between a transparent state and a non-transparent state; the light-control layer is in the transparent state when the display device is in a display state, and in the non-transparent state when the display device is in a non-display state; The light-controlling layer includes a liquid crystal layer that drives liquid crystal in any one of a VA (Vertical Alignment) mode, a TN (Twisted Nematic) mode, an IPS (In-Plane Switching) mode, and an FFS (Fringe Field Switching) mode, and a pair of polarizers; L ＊ a ＊ b ＊ The lightness L1 of the design layer in the color system is 35 or less, L when the visible light transmittance of the light-controlling layer is adjusted to the lowest ＊ a ＊ b ＊ The decorative sheet, wherein the lightness L2 of the light-controlling layer in a color space is 35 or less.

2. When the visible light transmittance of the light-controlling layer is adjusted to the lowest value, L ＊ a ＊ b ＊ The difference in lightness ΔL between the design layer and the light-control layer in the color system ＊ The decorative sheet according to claim 1 , wherein the value of the saturation coefficient is 25 or less.

3. When the visible light transmittance of the light-controlling layer is adjusted to the lowest value, L ＊ a ＊ b ＊ Color difference ΔE between the design layer and the light-control layer in the color system ＊ The decorative sheet according to claim 1 or 2, wherein ab is 45 or less.

4. 4. The decorative sheet according to claim 1, wherein the visible light transmittance of the decorative sheet is 10% or less when the visible light transmittance of the light-controlling layer is adjusted to the lowest value.

5. 5. The decorative sheet according to claim 1, wherein a difference between the visible light transmittance of the decorative sheet when the visible light transmittance of the light-controlling layer is adjusted to the lowest and the visible light transmittance of the decorative sheet when the visible light transmittance of the light-controlling layer is adjusted to the highest is 10% or more.

6. A decorative sheet disposed facing a display device, A design layer that is transparent to visible light; a light-controlling layer laminated on the side of the design layer facing the display device, the light-controlling layer is capable of adjusting a haze value by applying a voltage, thereby being switchable between a transparent state and a non-transparent state; the light-control layer is in the transparent state when the display device is in a display state, and in the non-transparent state when the display device is in a non-display state; the light-controlling layer includes a polymer dispersed liquid crystal (PDLC) having liquid crystal dispersed in a polymer, or a polymer network liquid crystal (PNLC) having liquid crystal disposed in voids formed inside a polymer network made of a resin formed in a three-dimensional mesh shape, L ＊ a ＊ b ＊ The lightness L1 of the design layer in the color system is 35 or more, The haze value of the light-modulating layer is adjusted to the highest value. ＊ a ＊ b ＊ The decorative sheet, wherein the lightness L2 of the light-controlling layer in a color space is 35 or more.

7. When the haze value of the light-modulating layer is adjusted to the highest value, L ＊ a ＊ b ＊ The difference in lightness ΔL between the design layer and the light-control layer in the color system ＊ The decorative sheet according to claim 6, wherein the value of the saturation coefficient is 25 or less.

8. When the haze value of the light-modulating layer is adjusted to the highest value, L ＊ a ＊ b ＊ Color difference ΔE between the design layer and the light-control layer in the color system ＊ The decorative sheet according to claim 6 or 7, wherein ab is 45 or less.

9. 9. The decorative sheet according to claim 6, wherein the haze value of the decorative sheet is 70% or more when the haze value of the light-controlling layer is adjusted to the highest value.

10. 10. The decorative sheet according to claim 6, wherein a difference between the haze value of the decorative sheet when the haze value of the light-controlling layer is adjusted to the highest and the haze value of the decorative sheet when the haze value of the light-controlling layer is adjusted to the lowest is 60% or more.

11. The decorative sheet according to claim 1 , wherein the design layer has a visible light transmittance of 20% or more.

12. 12. The decorative sheet according to claim 1, wherein the design layer has a pattern portion that forms a pattern, a light-shielding portion that is arranged on the display device side of the pattern portion, and a transparent portion that is a non-forming portion of the pattern portion and the light-shielding portion.

13. a display device for displaying information; A display device with a decorative sheet, comprising: the decorative sheet according to claim 1 , which is disposed facing the display device.

14. a display device for displaying information; a decorative sheet disposed facing the display device; a light-controlling layer disposed between the display device and the decorative sheet, The decorative sheet has a design layer that is transparent to visible light, the light-controlling layer is capable of adjusting the visible light transmittance by applying a voltage, thereby being switchable between a transparent state and a non-transparent state; The light-controlling layer includes a liquid crystal layer that drives liquid crystal in any one of a VA (Vertical Alignment) mode, a TN (Twisted Nematic) mode, an IPS (In-Plane Switching) mode, and an FFS (Fringe Field Switching) mode, and a pair of polarizers; L ＊ a ＊ b ＊ The lightness L1 of the design layer in the color system is 35 or more, When the visible light transmittance of the light-controlling layer is adjusted to the lowest value or the haze value is adjusted to the highest value, ＊ a ＊ b ＊ The lightness L2 of the light-modulating layer in the color system is 35 or more, The display device with a decorative sheet, wherein the light-controlling layer is in the transparent state when the display device is in a display state, and is in the non-transparent state when the display device is in a non-display state.

15. a display device for displaying information; a decorative sheet disposed facing the display device; a light-controlling layer disposed between the display device and the decorative sheet, The decorative sheet has a design layer that is transparent to visible light, the light-controlling layer can be switched between a transparent state and a non-transparent state by adjusting the haze value through application of a voltage; the light-controlling layer includes a polymer dispersed liquid crystal (PDLC) having liquid crystal dispersed in a polymer, or a polymer network liquid crystal (PNLC) having liquid crystal disposed in voids formed inside a polymer network made of a resin formed in a three-dimensional mesh shape, L ＊ a ＊ b ＊ The lightness L1 of the design layer in the color system is 35 or more, When the visible light transmittance of the light-controlling layer is adjusted to the lowest value or the haze value is adjusted to the highest value, ＊ a ＊ b ＊ The lightness L2 of the light-modulating layer in the color system is 35 or more, The display device with a decorative sheet, wherein the light-controlling layer is in the transparent state when the display device is in a display state, and is in the non-transparent state when the display device is in a non-display state.

16. the display device includes a light-emitting region and a non-light-emitting region adjacent to the light-emitting region; The display device with a decorative sheet according to claim 14 , wherein the light-controlling layer covers a boundary between the light-emitting region and the non-light-emitting region.

Images