Leather-textured light-emitting display device

Abstract

This leather-textured light-emitting display device includes: a leather-textured sheet that is a laminate of a colored resin layer that forms an outer surface layer, and a fibrous base material; a light-emitting part that is provided below the leather-like sheet; and a light-blocking part that is provided in one of the layers between the colored resin layer and the light-emitting part, and that partially restricts light transmission. The leather-textured light-emitting display device exhibits light-emitting display in which the luminance Ya of a non-light-emitting display region corresponding to the light-blocking part as measured from the surface of the colored resin layer is at most 200 cd / m2, the luminance Yb of a light-emitting display region corresponding to a portion excluding the light-blocking part as measured from a surface of the colored resin layer is 100-2,000 cd / m2, and Yb / Ya is at least 2.0.

Description

Leather-like light-emitting display device

[0001] The present invention relates to a light-emitting display device having a leather-like appearance for emitting light to display characters, figures, patterns, etc.

[0002] In recent years, with the diversification of consumer tastes, there has been a demand for materials with novel designs for decorating the surfaces of articles. In response to this background, a light-emitting display device has been proposed in which a lighting device, such as a backlight or a liquid crystal panel equipped with a backlight, is placed on the back of a colored sheet, and light is emitted and transmitted, thereby making letters, figures, patterns, etc. appear on the surface of the sheet.

[0003] The following Patent Document 1 discloses synthetic leather in which a surface layer made of polyurethane resin is laminated on raw cloth, and the visible light transmittance in the wavelength range of 380 to 780 nm is 0.10 to 11.90%.

[0004] Patent Document 1 discloses that a black synthetic leather is obtained by laminating a surface layer colored black with a black pigment (manufactured by DIC Corporation under the trade name "Dilac L-1770") onto a black polyester knitted fabric, and that the synthetic leather has a visible light transmittance of 0.17 to 0.20% in the wavelength range of 380 to 780 nm.

[0005] Furthermore, Patent Document 1 discloses that a white synthetic leather is obtained by laminating a surface layer colored white with a white pigment (manufactured by DIC Corporation under the trade name "Dailac L-1781") onto a white polyester knitted fabric, and the resulting synthetic leather has a visible light transmittance of 10.87 to 11.90% in the wavelength range of 380 to 780 nm.

[0006] Furthermore, Patent Document 2 below discloses a light-transmitting artificial leather sheet using a transparent or translucent elastomer sheet. This artificial leather sheet has a smoke print layer on the back or front surface of the elastomer sheet, and the outermost layer on the back surface of the elastomer sheet has a mask print layer for making letters, figures, patterns, or a design combination thereof stand out, and the patent document discloses a leather-like light-emitting display device that employs a light-transmitting artificial leather sheet in which the surface of the elastomer sheet is provided with leather-patterned irregularities.

[0007] JP 2013-177714 A JP 2014-173203 A

[0008] To provide a leather-like light-emitting display device that has a leather-like appearance with high concealment so that the internal structure of fibers or the like is not easily visible on the surface, and that, when a light source is turned on, can illuminate characters, figures, patterns, etc. on the surface of a leather-like colored resin layer with excellent visibility and high contrast, thereby combining a leather-like appearance, concealment of the internal structure, and highly visible light-emitting display properties.

[0009] One aspect of the present invention is a leather-look sheet that is a laminate of a colored resin layer and a fiber substrate that form an outer surface layer, a light-emitting portion disposed in a lower layer of the leather-look sheet, and a light-shielding portion that partially restricts light transmission and is interposed in any layer between the colored resin layer and the light-emitting portion, and the luminance Ya of a non-light-emitting display area corresponding to the light-shielding portion measured from the surface of the colored resin layer is 200 cd / m ２ or less, and the luminance Yb ​​of the light-emitting display area corresponding to the portion excluding the light-shielding portion is 100 to 2,000 cd / m ２ The leather-like light-emitting display device exhibits a light-emitting display in which Yb / Ya is 2.0 or more. The luminance is the brightness of light emitted per unit area (cd / m ２ With this configuration, the display device has a leather-like appearance in which the internal structure of the material, such as fibers, is not easily visible on the surface, and when the light source is turned on, characters, figures, patterns, etc., can be made to appear on the surface of the colored resin layer of the leather-like sheet with excellent visibility and high contrast, resulting in a leather-like appearance, a display device that combines the ability to conceal the internal structure, and a highly visible light-emitting display.

[0010] In addition, the leather-finish light-emitting display device has a luminance L of the light-emitting display area measured under conditions using a D65 light source from the surface of the colored resin layer with the light-emitting section turned off. * The value is preferably 5 or more and 15 or less. * When the value is within this range, the contrast when lit becomes clearer, and it is easy to adjust the value so as to achieve both the ability to conceal the internal structure and high visibility.

[0011] Furthermore, when the colored resin layer has an average light transmittance of 15% or more over the entire visible light wavelength range of 380 to 780 nm and an average light transmittance of 50% or more over the wavelength range of 680 to 780 nm, the contrast of the luminescent display becomes clearer and it is easy to adjust the light transmittance to achieve both hiding power and high visibility. Note that the average light transmittance values ​​are all arithmetic means.

[0012] Furthermore, it is preferable that the colored resin layer contains polyurethane and a first colorant dispersed in the polyurethane, and that the average dispersed particle diameter of the first colorant is 400 nm or less, and further that the colorant is miscible (compatible) with the polyurethane at the molecular level, since this makes it easier to obtain a colored resin layer that maintains high light transmittance even when colored a dark color.

[0013] Furthermore, it is preferable that the light-shielding portion is a printed layer, since it is easy to clearly form a light-shielding portion with excellent light-shielding properties that provides excellent contrast.

[0014] Furthermore, it is preferable that the light-shielding portion contains carbon black, since the light-shielding portion exhibits high light-shielding properties, and thus higher contrast is likely to be obtained.

[0015] Furthermore, it is preferable that the fiber substrate is a fiber structure containing fibers having an average fiber diameter of 1.0 to 10.0 μm, since this makes it easier to obtain higher contrast.

[0016] The light emitting part has a brightness of 500 to 40,000 cd / m ２ A surface light emitting device having a light emission intensity in the range of is preferable in terms of ease of adjustment to the luminance Ya and luminance Yb ​​as described above.

[0017] According to the present invention, a leather-like light-emitting display device can be obtained that has a leather-like appearance with high concealment properties, making it difficult for the internal structure, such as fibers, to show through to the surface, and that, when the light source is turned on, can illuminate letters, figures, patterns, etc., on the surface of the colored resin layer of the leather-like sheet with excellent visibility and high contrast, thereby combining a leather-like appearance with the concealment properties of the internal structure and highly visible light-emitting display properties.

[0018] FIG. 1 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 100 according to an embodiment. FIG. 2 is a schematic top view of the leather-patterned light-emitting display device 100 according to an embodiment. FIG. 3 is a schematic top view of a light source module including a surface-mounted substrate 53 on which a large number of LED devices 52 are surface-mounted, housed in a surface-emitting light source 50 according to an embodiment. FIG. 4 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 110 according to another embodiment. FIG. 5 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 120 according to another embodiment. FIG. 6 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 130 according to another embodiment. FIG. 7 shows the light transmittance spectra of the colored resin sheets (colored resin layers) obtained in Example 5 and Comparative Example 6 in the visible light region of wavelengths from 380 to 780 nm.

[0019] An embodiment of a leather-pattern light-emitting display device according to the present invention will be described in detail with reference to the drawings. Fig. 1 shows a partially enlarged schematic cross-sectional view of a leather-pattern light-emitting display device 100, which is a representative example of the leather-pattern light-emitting display device of this embodiment. Fig. 2 is a schematic top view of the leather-pattern light-emitting display device 100, where (a) shows the light-emitting unit when it is turned off and (b) shows the light-emitting unit when it is turned on. Fig. 3 is a schematic top view of a light source module including a surface-mounted substrate 53 on which multiple LED devices 52 are surface-mounted, housed in a surface-emitting light source 50, which is the light-emitting unit of this embodiment.

[0020] In Fig. 1, reference numeral 1 denotes a colored resin layer forming an outer surface layer, 2 denotes a fiber substrate, and 10 denotes a leather-look sheet that is a laminate of the colored resin layer 1 and the fiber substrate 2. Reference numeral 50 denotes a surface-emitting light source (light-emitting portion) that provides surface illumination by light emitted from a number of LED devices 52. Reference numeral 3 denotes a light-shielding portion that is interposed in any layer between the colored resin layer 1 and the surface-emitting light source 50 and partially restricts light transmission.

[0021] The surface-emitting light source 50 comprises a housing (not shown), a light source module consisting of a surface-mounted substrate 53 on which a number of LED devices 52 housed in the housing are surface-mounted, and a light-transmitting lighting cover 51 that covers the light source module.

[0022] The LED device 52 may be, without particular limitation, a blue LED device including a blue LED chip, a white LED device that combines a blue LED chip with a phosphor to emit white or warm white light, a green LED device that includes only a green LED chip, a red LED device that includes only a red LED chip, a near-ultraviolet LED device that combines a near-ultraviolet LED chip with a phosphor to emit light, a full-color LED device that includes LED chips that emit red, green, or blue light, and changes the intensity of the light of each color by changing the amount of current flowing through each LED chip, and changes the emitted color by changing the mixing ratio of the three colors, etc. Note that the light-emitting unit may include, instead of an LED device, an HID lamp (High Intensity Discharge lamp), a fluorescent lamp, a halogen lamp, an incandescent lamp, or the like as a light source.

[0023] The lighting cover 51 is a light-transmitting molded body formed into a shape suited to the intended use. The lighting cover 51 is preferably formed so that the light-emitting surface thereof contains a textured surface, inorganic particles such as silica, or organic or inorganic pigments that function as color filters, thereby diffusing the light emitted from the numerous LED devices 52, which are point light sources, and providing surface emission with uniform brightness.

[0024] The type of transparent resin used as the main component of the light-transmitting molded body is not particularly limited, but examples include acrylic resins, methacrylic resins, ABS resins, polyolefin resins, polycarbonate resins, and silicone resins. The light-transmitting molded body includes transparent, translucent, and colored transparent molded bodies. It is preferable that the average light transmittance of the light-emitting surface of the lighting cover across the entire visible light range of wavelengths from 380 to 780 nm is 5% or more, more preferably 50% or more, particularly 85% or more, and even more preferably 95% or more.

[0025] 3, the surface-emitting light source 50 includes a number of LED devices 52 and a surface-mounting substrate 53 on which the number of LED devices 52 are mounted. The number of LED devices 52 mounted on the surface-mounting substrate 53 is appropriately selected depending on the light-emitting intensity of each LED device and the desired brightness of the leather-like light-emitting display device so that the brightness can be adjusted as described below. When power is supplied to the LED devices 52, the surface-emitting light source 50 causes the light-emitting surface of the lighting cover 51 to emit light.

[0026] A current control unit such as an LED driver (not shown) is mounted on the surface mount board 53. The LED driver may be any known LED driver equipped with a constant current circuit that controls the current value supplied to each LED device 52, a PWM control circuit that controls brightness by pulse control, or the like, without any particular limitations. The type of such LED driver is appropriately selected depending on the desired brightness of the leather-like light-emitting display device.

[0027] The luminous intensity of the surface emitting light source is set to 200 cd / m2, which will be described in detail later, when the luminance Ya of the non-luminous display area corresponding to the light-shielding portion is 200 cd / m2. ２ or less, and the luminance Yb ​​of the light-emitting display area corresponding to the light-transmitting portion excluding the light-shielding portion is 100 to 2,000 cd / m ２ The light emitting intensity of the surface emitting light source is, for example, 500 to 40,000 cd / m ２ It is preferable that the range is from the viewpoint of facilitating adjustment to the luminance Ya and the luminance Yb ​​as described above. Furthermore, the surface-emitting light source may have a function for adjusting the luminance as long as the above-described luminance relationship can be obtained.

[0028] 1, the leather-finish light-emitting display device 100 is formed by adhering the fiber substrate 2 of the leather-finish sheet 10 to the light-emitting surface of the lighting cover 51 of the surface-emitting light source 50 via an adhesive layer 60. A light-shielding portion 3 that partially restricts light transmission is interposed in any layer between the colored resin layer 1 and the surface-emitting light source 50.

[0029] The light-shielding portion 3 is formed by printing characters, figures, patterns, etc. corresponding to the light-emitting display area on the fiber substrate 2 using ink containing a pigment such as a black pigment, with the characters, figures, patterns, etc. printed in white on the fiber substrate 2. The formation of the light-shielding portion is not limited to printing on such a fiber substrate. For example, the light-shielding portion may be formed by adhering a transparent resin sheet printed with the light-shielding portion to the fiber substrate or the light-emitting surface of the light-emitting portion, as described below. The light-shielding portion may also be printed directly on the light-emitting surface. Furthermore, the method is not limited to printing, and the light-shielding portion may be formed by transferring a sticker. Forming the light-shielding portion by printing is particularly preferred because it is easy to clearly form a light-shielding portion that provides high contrast, and the design can be easily changed, resulting in excellent productivity.

[0030] Examples of printing methods used for printing the light-shielding portion include screen printing, gravure printing, inkjet printing, etc. Among these, screen printing is preferred because it can form the light-shielding portion stably at a relatively low cost and is therefore excellent in terms of printing mass productivity.

[0031] Examples of inks used for printing include pigment inks containing highly opaque pigments such as carbon black or titanium oxide and binders such as acrylic resins, and dye inks containing dark dyes. The light-shielding portion preferably contains carbon black, as this exhibits high light-shielding properties due to its large dispersed particle diameter and provides excellent contrast.

[0032] The light-shielding portion formed in this manner is not particularly limited as long as a leather-like light-emitting display device exhibiting the above-mentioned luminance Ya and luminance Yb ​​can be obtained, but it is preferably a film having an average light transmittance of 0.05% or less, and more preferably 0.02% or less, over the entire visible light wavelength range of 380 to 780 nm. The thickness of the light-shielding portion is also not particularly limited, but is preferably about 5 to 80 μm, and more preferably about 20 to 50 μm.

[0033] The position of the light-shielding portion is not particularly limited as long as it is formed so as to be interposed in any layer between the colored resin layer and the light-emitting portion. For example, Fig. 4 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 110 according to another embodiment. In the leather-patterned light-emitting display device 110, the light-shielding portion 3 is printed on the light-emitting surface of the lighting cover 51 constituting the surface-emitting light source 50.

[0034] 5 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 120 according to yet another embodiment. In the leather-patterned light-emitting display device 120, the light-shielding portion 3 is printed on one surface of a transparent resin layer (transparent resin sheet) 40. The transparent resin layer 40 on which the light-shielding portion 3 is printed is adhered to the fiber substrate 2 via an adhesive layer 60 and to the light-emitting surface of the light cover 51 via an adhesive layer 61. The transparent resin layer 40 may have light-diffusing properties.

[0035] 6 is a partially enlarged schematic cross-sectional view of a leather-patterned light-emitting display device 130 according to yet another embodiment. The leather-patterned light-emitting display device 130 includes a leather-patterned sheet 10 similar to that of the leather-patterned light-emitting display device 100. The leather-patterned sheet 10 includes a light-shielding portion 3 on a fiber substrate 2, on which characters, figures, patterns, etc. are partially printed in white, corresponding to the light-emitting display area. The leather-patterned light-emitting display device 130 was manufactured using this leather-patterned sheet 10 by in-mold decorative molding using injection molding, as described below.

[0036] The surface resin layer 1 is placed facing the cavity surface of the mold, and the leather-look sheet 10 with the light-shielding portion 3 printed thereon is placed in the injection mold. Then, a molten light-transmitting resin is filled into the clamped injection mold and cooled to form a light-transmitting resin molded body laminated and integrated with the leather-look sheet 10 with the light-shielding portion 3 formed thereon. In this manner, a light-transmitting leather-look cover 70 is produced, in which the leather-look sheet 10 including the light-shielding portion 3 is laminated and integrated with a transparent resin layer (light-transmitting resin molded body) 65 as shown in FIG. 6 . The light-transmitting leather-look cover 70 is fixed to the surface of the lighting cover 51 constituting the surface-emitting light source 50 by adhesive bonding or clamps, screws, or the like, to obtain a leather-look light-emitting display device 130. The transparent resin layer 65 may also have light-diffusing properties.

[0037] Fig. 2 is a schematic top view of the leather-patterned light-emitting display device 100. Fig. 2(a) shows an image when the surface-emitting light source 50 is turned off, and Fig. 2(b) shows an image when the surface-emitting light source 50 is turned on. Referring to Fig. 2, the leather-patterned light-emitting display device 100 comprises a light-emitting display region L, which is an unprinted region having outlines of the numbers 1 to 5, and a non-light-emitting display region NL, which is an area corresponding to the light-shielding portion 3 on which the outlines of the numbers 1 to 5 are printed in white.

[0038] In the leather-finish light-emitting display device 100, when the surface-emitting light source 50 is turned off, as shown in Fig. 2(a), it is difficult to see from the surface the internal structure such as the internal fibers and the letters, figures, and patterns formed by the light-emitting display area L. On the other hand, when the surface-emitting light source 50 is turned on, as shown in Fig. 2(b), the light-shielding portion 3 partially restricts the transmission of light, so that light is transmitted only to the light-emitting display area L corresponding to the portion excluding the light-shielding portion 3, and the numbers 1 to 5 appear with high contrast on the surface of the colored resin layer 1.

[0039] In addition, the leather-finish light-emitting display device 100 has a luminance Ya of 200 cd / m ２ or less, and the luminance Yb ​​of the light-emitting display area L corresponding to the portion excluding the light-shielding portion 3 is 100 to 2,000 cd / m ２ and Yb / Ya is adjusted to be 2.0 or more. By adjusting the luminance in this manner, the leather-like appearance is presented with high concealment, in which the internal structure of the fibers or the like is less likely to show through to the surface, and when the light source is turned on, letters, figures, patterns, etc. can be made to appear with high contrast on the surface of the colored resin layer of the leather-like sheet, thereby providing a leather-like appearance and high visibility.

[0040] In such a leather-like light-emitting display device, the luminance Ya is 200 cd / m ２ or less, and the luminance Yb ​​is 100 to 2,000 cd / m ２ and the Yb / Ya is adjusted to be 2.0 or more, and preferably the luminance Ya is 150 cd / m ２ or less, and the luminance Yb ​​is 200 to 1500 cd / m ２and the Yb / Ya is adjusted to be 2.5 or more, and more preferably, the luminance Ya is adjusted to be 120 cd / m ２ or less, and the luminance Yb ​​is 140 to 450 cd / m ２ and the Yb / Ya ratio is adjusted to be 3.0 or more.

[0041] The luminance Ya of the non-light-emitting display area is 200 cd / m ２ If it is larger, the internal structure becomes more visible from the surface when the light is turned off.

[0042] Furthermore, the luminance Yb ​​of the light-emitting display area is 100 cd / m ２ If it is less than this, the brightness of the light-emitting display area will be too low, making it difficult to see characters, figures, and patterns, especially fine patterns, and visibility will decrease when the environmental illuminance is high.

[0043] In addition, the luminance Yb ​​of the light-emitting display area is 2,000 cd / m ２ If the brightness exceeds 100%, the brightness is too high and fine patterns become blurred and difficult to see.

[0044] Furthermore, if Yb / Ya is less than 2.0, the luminance Yb ​​of the luminous display area is too low compared to the luminance Ya of the non-luminous display area, and the contrast of the luminous display area relative to the non-luminous display area becomes low.

[0045] In addition, the leather-finish light-emitting display device has a luminance L of the light-emitting display area measured under conditions using a D65 light source from the surface of the colored resin layer with the light-emitting section turned off. * The value is preferably 5 or more and 15 or less. * When the value is within this range, the contrast when lit becomes clearer, and it is easy to adjust the value to obtain a luminous display that is excellent in both concealment properties for concealing the internal structure and visibility.

[0046] The leather-look sheet used in this embodiment includes a fiber substrate and a colored resin layer that forms an outer surface layer laminated on the fiber substrate. The colored resin layer is a layer that forms the outer surface layer and is made of a light-transmitting resin in which a colorant is dispersed, and is adjusted to transmit light when turned on and to conceal the internal structure from the surface of the leather-look light-emitting display device.

[0047] The resin that constitutes the main component of the colored resin layer is not particularly limited as long as it is a light-transmitting resin with sufficient light transmittance, but various resins with an average light transmittance of 60% or more, or even 70% or more, across the entire visible light wavelength range of 380 to 780 nm are preferably used. Specific examples of such light-transmitting resins include polyurethane, acrylic elastomers, silicone elastomers, polyamide elastomers, polyester elastomers, polystyrene elastomers, and polyolefin elastomers, which have traditionally been used to produce grain-finish leather-look sheets. Among these, polyurethane is particularly preferred because it is easy to obtain a leather-look sheet that has an excellent balance of light transmittance and a leather-look feel.

[0048] Specific examples of polyurethane include polycarbonate polyurethane, polyether polyurethane, polyester polyurethane, polycarbonate / polyether polyurethane, polyester / polyether polyurethane, etc. Among these, polycarbonate polyurethane is particularly preferred because of its excellent durability and heat resistance.

[0049] As the color pigment dispersed in the light-transmitting resin, it is preferable to use pigments or dyes with excellent dispersibility, particularly pigments or dyes that increase the transmittance of light in the 680 to 780 nm range. Specific examples of such pigments include reactive special pigments, such as Milliken's Vivitint and Reactint, in which a polymer segment such as a polyol is bonded to a chromophore and the segment has a reactive functional group at its end; disperse-type perylene black and aniline black; organic pigments such as Pigment Yellow 73 and Pigment Red 5; polymeric dyes with a reactive polymerization group; disperse dyes; and basic dyes. Among these, reactive special pigments, such as Vivitint and Reactint, in which a polymer segment such as a polyol is bonded to a chromophore, are particularly preferred.

[0050] The polymer segment in the reactive special pigment contributes to improved compatibility with the colored resin layer. In particular, when the resin that constitutes the main component of the colored resin layer is polyurethane and the polymer segment is polyol, the high molecular weight polyol unit, which is the soft segment of the polyurethane, and the polyol polymer segment show good compatibility, thereby particularly improving dispersibility in the colored resin layer. Furthermore, by reacting the reactive polymer group of the reactive special pigment with the molecules of the resin that forms the colored resin layer, the dispersibility of the colored pigment can also be further improved.

[0051] In a colored resin layer, normally, increasing the light transmittance reduces the dark color, and increasing the dark color tends to reduce the light transmittance. In this embodiment, by adjusting the type of colored pigment, the dispersion state, and the surface emission intensity of the surface-emitting light source, the leather-like appearance of the light-emitting display device is adjusted so that the light emitted from the light-emitting unit is sufficiently transmitted when it is turned on, while the internal structure, such as fibers, is not easily visible through the surface.

[0052] The average dispersed particle diameter of the colorant is preferably 400 nm or less, and more preferably 300 nm or less, and it is particularly preferable that the colorant is mixed (compatible) with the colored resin sheet at the molecular level so that the outline shape of the colorant particles cannot be clearly identified. If the average dispersed particle diameter of the colorant is too large, the colorant particles tend to scatter or reflect light of long wavelengths, making it difficult to maintain the average visible light transmittance in the red region of wavelengths 680 to 780 nm at 50% or more, as described below.

[0053] In addition, the colored resin layer or the colored resin sheet for forming the colored resin layer is preferably a resin having a brightness L * Dark or deep colors with a value of 5 or more and 15 or less, or lightness L * A moderately dark color with a value of more than 15 and not more than 35 is preferred because it makes the contrast clearer when lit and is easy to adjust so as to easily obtain a luminescent display with better hiding power and visibility.

[0054] Also, the brightness L * A dark colored resin sheet having a value of 5 or more and 15 or less, or a lightness L* When a medium-dark colored resin sheet having a value of more than 15 and not more than 35 is used, the average visible light transmittance in the red region of wavelengths from 680 to 780 nm is preferably 50% or more, and even more preferably 55 to 65%. When the average visible light transmittance in the red region of wavelengths from 680 to 780 nm of the colored resin sheet is 50% or more, a large amount of light in the red region of wavelengths from 680 to 780 nm, which does not easily brighten the emitted color, can be transmitted, and the average light transmittance in the entire visible light region can be maintained high.

[0055] Also, the brightness L * When a dark colored resin sheet having a lightness L value of 5 or more and 15 or less is used, the average light transmittance in the entire visible light region of wavelengths from 380 to 780 nm is preferably 15% or more, and more preferably 15 to 26%. For example, referring to FIG. 7, the colored resin sheet used in Example 3 below, which contains 10% by mass of VIVITINT BLACK 856, has a lightness L * The colored resin sheet has a lightness L of 7.9 and an average light transmittance of 20.5% in the entire visible light region of 380 to 780 nm. On the other hand, the colored resin sheet used in Comparative Example 3 (described later) containing 2.0% by mass of carbon black shown in FIG. 7 has a lightness L * The value was 10.0, and the average light transmittance over the entire visible light range of 380 to 780 nm wavelength was 4.8%, making it a dark colored resin sheet.

[0056] Also, the brightness L * In the case of a medium dark color with a value of more than 15 and not more than 35, it is preferable that the average light transmittance is 25% or more, and more preferably 25 to 35%, in the entire visible light region of wavelengths from 380 to 780 nm. For example, the colored resin sheet obtained in Example 4 below, which contains 5% by mass of dispersion-type perylene black, has a lightness L * The average light transmittance in the entire visible light region of wavelengths from 380 to 780 nm was 25.2%, making it a medium-dark colored resin sheet.

[0057] The thickness of the colored resin layer or the colored resin sheet for forming the colored resin layer and the content of the colorant are determined based on the desired surface brightness L* The thickness of the colored resin layer and the colorant content are adjusted according to the value. An example of the thickness of the colored resin layer and the colorant content is a combination of a colored resin layer thickness of 30 to 90 μm and a colorant content of 1 to 20 parts by mass per 100 parts by mass of resin. For example, to obtain a black color, it is preferable to add approximately 7.5 to 15.0 parts by mass of black pigment per 100 parts by mass of resin, and to obtain a dark brown color, it is preferable to add 1.0 to 5.0 parts by mass of black pigment and approximately 2.5 to 7.5 parts by mass of red pigment per 100 parts by mass of resin. If the pigment content is too high, light transmittance decreases.

[0058] The colored resin layer may have a single layer structure made of a resin composition with a uniform blending composition, or may have a laminate structure made of a plurality of layers made of resin compositions with different blending compositions.

[0059] The fiber substrate is not particularly limited, but is preferably a nonwoven fabric. Nonwoven fabrics have randomly entangled fibers, making the fiber pattern less visible when light is transmitted through them, resulting in excellent brightness uniformity of the luminescent display. On the other hand, if the fiber substrate is a knitted or woven fabric in which the fibers are oriented in a specific direction, the fiber structure is projected onto the transmitted light when light is transmitted through the nonwoven fabric, which tends to reduce the brightness uniformity of the luminescent display.

[0060] As the resin forming the fiber of the fiber substrate, a thermoplastic resin having optical transparency is preferably used. Specific examples of such thermoplastic resins include polyester resins such as polyethylene terephthalate (PET) or modified polyester resins such as modified PET obtained by copolymerizing a trace amount of monomer units with these; polyamide resins such as polyamide 66; various acrylic resins; and thermoplastic resins having fiber-forming ability such as olefin resins such as polyethylene and polypropylene. These may be used alone or in combination of two or more.

[0061] The fiber form, such as the fiber diameter, cross-sectional shape, and fiber length, of the fibers forming the fiber substrate can be appropriately selected. As a fiber form, a nonwoven fabric made of fibers having an average fiber diameter of 1.0 to 10.0 μm, preferably 1.5 to 9.0 μm, and more preferably 2.0 to 8.0 μm, is preferred because it is highly flexible and can improve light transmittance by densifying the nonwoven fabric and reducing the porosity. If the average fiber diameter of the nonwoven fabric exceeds 10.0 μm, the shadow of the entangled fibers is likely to be cast on the transmitted light, which may reduce the uniformity of the brightness of the luminescent display. The average fiber diameter can be calculated by taking a scanning electron microscope (SEM) photograph of the cross section of the leather-like sheet at 3000x magnification, randomly selecting 10 fiber cross sections, measuring the fiber diameter, and averaging the fiber diameters.

[0062] The resin used in the production of the fiber substrate may contain various additives, such as color inhibitors, heat resistance agents, flame retardants, lubricants, stain resistant agents, fluorescent brighteners, matting agents, gloss improvers, antistatic agents, fragrances, deodorizers, catalysts, antibacterial agents, anti-mite agents, inorganic particles, etc., as needed, provided that the purpose and effects of the present invention are not impaired.

[0063] The resin used to produce the nonwoven fabric is preferably an uncolored or white fiber that does not substantially contain a coloring agent that colors the fiber, since this makes it easier to obtain a leather-like sheet with high light transmittance. The term "uncolored or white fiber" refers to a fiber that does not contain any coloring agent such as a color pigment or dye mixed into the raw material before spinning.

[0064] Furthermore, the fiber substrate preferably contains a polymeric elastomer, preferably a light-transmitting, uncolored polymeric elastomer, in its internal voids. Specific examples of such polymeric elastomers include polyurethane-based elastomers, acrylic-based elastomers, polyamide-based elastomers, polyester-based elastomers, polystyrene-based elastomers, and polyolefin-based elastomers. Among these, polyurethane-based elastomers and acrylic-based elastomers are preferred, particularly the combination of polyurethane-based elastomers and acrylic-based elastomers, because they provide an excellent balance between light transmittance and mechanical properties. Furthermore, the polymeric elastomer is preferably a non-foamed material in order to maintain high light transmittance.

[0065] When the fiber substrate is an entangled nonwoven fabric of ultrafine fibers made of island components obtained by removing the sea component from an entangled sheet of islands-in-sea composite fibers, it is preferable to also impart a polymeric elastomer to the voids in the fiber bundles formed by removing the sea component, since the interface between the ultrafine fibers and air is replaced by the interface between the ultrafine fibers and the polymeric elastomer, thereby reducing the refractive index difference and further improving light transmittance.

[0066] When the fibrous substrate contains a polymeric elastomer, the content of the polymeric elastomer in the fibrous substrate is preferably 1 to 50% by mass, more preferably 5 to 30% by mass.

[0067] Furthermore, when the fiber substrate contains a polymeric elastomer, it is preferable that the void ratio in the fiber substrate is 70% by volume or less, more preferably 60% by volume or less, and particularly preferably 50% by volume or less, in order to exhibit high light transmittance.

[0068] The thickness of the fiber substrate is preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.6 mm, since this makes it easier to obtain a leather-like sheet that maintains high light transmittance.

[0069] A leather-look sheet is manufactured, for example, as follows. First, a colored resin sheet that will become the colored resin layer is formed on a support substrate such as release paper, and then an adhesive layer is formed on the surface of the colored resin sheet. The adhesive layer is then attached to a fiber substrate and, if necessary, pressed to adhere. The leather-look sheet is then obtained by peeling the release paper from the colored resin layer. As an adhesive for forming the adhesive layer, two-component curing polyurethane resin adhesives, hot-melt polyurethane resin adhesives, and the like, which have traditionally been used as adhesives in the manufacture of leather-look sheets, are preferably used. The thickness of the adhesive layer is not particularly limited, but is preferably, for example, 10 to 300 μm. The amount of adhesive is not limited, but, for example, a thickness of 50 to 100 g / m2 is preferred. ２ It is preferable that the amount is about the same.

[0070] The thickness of the leather-like sheet obtained in this manner is not particularly limited, but is preferably, for example, 0.02 to 10 mm, more preferably 0.05 to 5 mm, from the viewpoint of maintaining sufficient light transmittance. The apparent density of the leather-like sheet is 0.03 to 1.5 g / cm. 3 , and further 0.06 to 1.2 g / cm 3 It is preferable that:

[0071] The leather-finish sheet preferably has an average light transmittance of 2% or more, more preferably 2 to 20%, and even more preferably 2 to 10% over the entire visible light wavelength range of 380 to 780 nm. If the average light transmittance over the entire visible light wavelength range of 380 to 780 nm is less than 2%, the light transmittance is so low that letters, figures, and patterns formed by light tend to be difficult to clearly display on the surface of the colored resin layer.

[0072] The surface of the leather-like seat, L * a * b * Lightness L in the color system * The value is preferably 40 or less, more preferably 25 or less.

[0073] Furthermore, the leather-finish sheet of this embodiment preferably has an average light transmittance of 5% or more, more preferably 7 to 15%, in the red wavelength region of 680 to 780 nm. By having an average light transmittance of 5% or more in the red wavelength region of 680 to 780 nm of the leather-finish sheet, a large amount of light in the red region, which is difficult to brighten the luminous color, is transmitted, and the surface brightness L ＊ Dark colors with a value of 15 or less, or lightness L * Even in the case of a medium dark color with a value of more than 15 and not more than 35, it is easy to maintain light transmittance such that the average light transmittance is, for example, 2% or more in the entire visible light wavelength range of 380 to 780 nm.

[0074] In addition, the surface of the leather-like seat is lighter than * Value is 15 or less, and brightness L *It is particularly preferred that the value is 5 or more and 15 or less, and that the average light transmittance of the leather-finish sheet is 2% or more in the entire visible light region of wavelengths from 380 to 780 nm. In the case of such a leather-finish sheet, it is preferred from the viewpoint of achieving a particularly excellent balance between light transmittance and opacity, which makes transmitted light clearer in dark colors.

[0075] Such a leather-like light-emitting display device is preferably used as a light-emitting display device for home appliances, lighting equipment, office automation equipment, instrument panels for vehicles, aircraft, ships, etc. In particular, it is preferably used as a light-emitting display device that has a luxurious feel due to the texture and feel of the leather-like appearance and can realize a variety of designs, including those for the surroundings.

[0076] The present invention will be described in more detail below with reference to examples, although the scope of the present invention is not limited to these examples in any way.

[0077] First, the evaluation methods for the leather-like sheets manufactured as described below will be summarized below.

[0078] (Average Dispersed Particle Diameter and Dispersibility of Colorant) A leather-look sheet was embedded in epoxy resin. The colored resin sheet of the leather-look sheet embedded in epoxy resin was then sliced ​​in the cross-sectional direction with an ultramicrotome to create a test specimen. The test specimen was then photographed with a transmission electron microscope (Hitachi, Ltd., "H-800NA" model, 10,000-100,000x magnification) to calculate the average particle diameter of the colorant particles within a 10 μm square field of view. The average particle diameter was determined by taking the distance between the longest part of the particle as the particle diameter and arithmetically averaging the particle diameters of the particles within the field of view. The average particle diameter obtained at 10 locations was arithmetically averaged to obtain the average dispersed particle diameter of the colorant. Furthermore, cases where the colorant dissolved and its outline could not be identified were rated as A, cases where the average dispersed particle diameter was less than 400 nm as B, and cases where the average dispersed particle diameter was 400 nm or greater as C.

[0079] (Measurement of light transmittance of colored resin sheet) The light transmittance of the coating of the colored resin sheet peeled from the release paper in the wavelength range of 380 to 780 nm was measured using a spectrophotometer (Hitachi U-3010 Spectrophotometer). The arithmetic mean value of the light transmittance in the entire visible light wavelength range of 380 to 780 nm and the arithmetic mean value of the light transmittance in the entire red light wavelength range of 680 to 780 nm were then calculated. As an example, Figure 7 shows the spectra showing the light transmittance in the visible light wavelength range of 380 to 780 nm for the colored sheets obtained in Example 3 and Comparative Example 3.

[0080] (Measurement of light transmittance of leather-look sheet) The light transmittance of the leather-look sheet in the wavelength range of 380 to 780 nm was measured using a spectrophotometer (Hitachi U-3010 Spectrophotometer). The arithmetic mean value of the light transmittance in the entire visible light wavelength range of 380 to 780 nm and the arithmetic mean value of the light transmittance in the entire red light wavelength range of 680 to 780 nm were calculated.

[0081] (Lightness L * The chromaticity of the surface of the colored resin sheet or the colored resin layer of the leather-like sheet was measured using a spectrophotometer (CM-3610d, manufactured by Konica Minolta, D65 light source). Specifically, a standard white plate (aluminum oxide plate) was placed on the opposite side of the surface of the colored resin sheet or leather-like sheet, set in the spectrophotometer, and color measurement was performed. From the colorimetric values, L * a * b * Lightness L in the color system * The value was calculated.

[0082] (Apparent density of leather-like sheet) Thickness (mm) and basis weight (g / cm) according to JIS L 1913 ２ ) and from these values, the apparent density (g / cm 3 ) was calculated.

[0083] (Average fiber diameter of fibers forming the fiber substrate of the leather-look sheet) The average fiber diameter was measured by taking a scanning electron microscope (SEM) photograph of the cross section in the thickness direction of the leather-look sheet at 3000x magnification, and randomly selecting 10 fiber cross sections to measure the fiber diameter. The diameter of the circumscribed circle of the selected fiber cross section was taken as the fiber diameter of that fiber. The average value of the obtained 10 fiber diameters was calculated and used as the average fiber diameter.

[0084] (Porosity of fiber substrate of leather-look sheet) A scanning electron microscope (SEM) photograph of a cross section in the thickness direction of the leather-look sheet was taken at 300x magnification, and the true thickness in the thickness direction was measured. The porosity of the fiber substrate was calculated from the basis weight of the fiber substrate and the density of the raw material used in the substrate using the following formula: Porosity of fiber substrate (volume %) = (1 - (basis weight / raw material density) / (thickness / true thickness)) x 100

[0085] Example 1 (Production of Leather-Like Sheet) A water-soluble thermoplastic polyvinyl alcohol resin was used as the sea component, and PET modified with 6 mol% isophthalic acid was used as the island component. Using a melt conjugate spinning die with 25 islands per fiber and a sea component / island component ratio of 25 / 75 (mass ratio), islands-in-sea filaments were extruded from the die at 260°C. The ejector pressure was adjusted to a spinning speed of 3700 m / min, and islands-in-sea conjugate long fibers with an average fineness of 2.1 dtex were collected on a net. The islands-in-sea conjugate long fibers collected on the net were lightly pressed with a metal roll having a surface temperature of 42°C to suppress surface fuzzing and were then peeled from the net. The sheet peeled from the net was then passed through a checkered metal roll and a back roll having a surface temperature of 75°C for hot pressing, resulting in a sheet with a basis weight of 31 g / m2, where the ultrafine fibers on the surface were pre-fused. ２ A long fiber web of 1000 .mu.m was obtained.

[0086] The obtained long fiber web was then cross-wrapped to pile up eight sheets, which were then sprayed with a needle breakage prevention oil. Then, using a 6-barb needle with a distance from the needle tip to the barb of 3.2 mm, the web was punched alternately from both sides at a needle depth of 8.3 mm at 3,300 punches / cm. ２ By needle punching at a punch density of 320 g / m ２ An entangled filament web of 1000 .mu.m was obtained.

[0087] The long fiber web was then immersed in hot water at 70° C. for 14 seconds at a winding line speed of 10 m / min to cause thermal shrinkage, thereby obtaining a densified entangled web.

[0088] Next, the densified entangled web was impregnated with polyurethane as follows. A polyurethane emulsion (solid concentration 30%) mainly composed of polycarbonate / ether-based polyurethane was impregnated into the densified entangled web. The web was then dried in a drying oven at 150°C. The polyurethane-impregnated entangled web thus obtained was repeatedly subjected to dip-nip treatment in hot water at 95°C to dissolve and remove the modified PVA, thereby obtaining a nonwoven fabric of ultrafine fibers in which fiber bundles containing 25 ultrafine long fibers with an average fineness of 0.1 dtex were three-dimensionally entangled. The nonwoven fabric was then sliced ​​and buffed to obtain an apparent density of 0.50 g / cm. 3 Thus, a nonwoven fabric substrate of ultrafine fibers having a thickness of 0.35 mm and an average fiber diameter of 3.0 μm was prepared.

[0089] The nonwoven fabric substrate was then impregnated with an acrylic elastomer emulsion (RYUDYE-WBINDER 11KS-EN, manufactured by DIC Corporation, solid content 30% by mass) at a pickup rate of 100%. The resulting material was then dried in a dryer at 100°C for 10 minutes to obtain a fibrous substrate. The ratio of active ingredients in the fibrous substrate calculated from the pickup rate was ultrafine fiber / polyurethane / acrylic elastomer = 90 / 10 / 20 (mass ratio). The porosity of the fibrous substrate was 44%.

[0090] A resin solution for forming a colored resin layer was prepared by dispersing a black pigment (VIVITINT BLACK 856, manufactured by Milliken) in a 30% by weight polyurethane DMF solution containing non-yellowing polycarbonate-based polyurethane. The resin solution contained 7.5% by weight of black pigment relative to the solid content of the non-yellowing polycarbonate-based polyurethane. The prepared resin solution was applied to release paper and then dried at 120°C for 2 minutes to form a 60 μm thick black colored resin sheet. The resulting colored resin sheet was peeled off from the release paper.

[0091] Next, a resin liquid for forming an adhesive layer was applied to the surface of the colored resin sheet formed on the release paper, and then dried for 2 minutes at 120° C. to form an adhesive layer with a thickness of 50 μm. The resin liquid for forming the adhesive layer was a 30 mass % DMF solution of polycarbonate-based polyurethane.

[0092] The adhesive layer formed on the release paper was placed in contact with one side of the fiber substrate and pressed with a heated roll set at a surface temperature of 75°C. After aging at 50°C for 3 days, the release paper was peeled off to obtain a leather-like sheet with a black colored resin layer. The leather-like sheet thus obtained had a thickness of 0.31 mm and an apparent density of 1.07 g / cm. 3 , basis weight 333g / m ２ It was.

[0093] (Production of Leather-Patterned Light-Emitting Display Device) Using the obtained leather-patterned sheet, a leather-patterned light-emitting display device was produced and evaluated as follows.

[0094] In a 100 mm x 100 mm square area on one side of the fiber substrate of the obtained leather-like sheet, numbers 1 to 9 were printed in 40 pt (14.11 mm) font in white, forming a light-shielding area, using a screen printing block with black ink. The film thickness of the light-shielding area was approximately 20 μm.

[0095] A leather-look sheet with a light-shielding area formed in a square area of ​​100 mm x 100 mm was set in the mold of an injection molding machine, and transparent polycarbonate resin was injection molded to a thickness of 1 mm on the surface on the same side as the light-shielding area to obtain a light-transmitting leather-look cover with a light-shielding area.

[0096] On the other hand, a surface emitting light source having a square light emitting surface of 100 mm x 100 mm and containing a number of white LED devices was prepared. ２ It has an adjustable range of luminous surface brightness.

[0097] The light-transmitting leather-look cover was then fixed to the light-emitting surface of the surface-emitting light source with screws at all four corners so that the light-emitting surface was in close contact with the cover. A leather-look light-emitting display device was thus manufactured. The leather-look light-emitting display device was then evaluated according to the following evaluation methods.

[0098] (Lighting area brightness L * The chromaticity of the light-emitting area on the surface of the colored resin sheet of the leather-like light-emitting display device was measured using a spectrophotometer (CM-25cG, manufactured by Konica Minolta). Specifically, with the surface-emitting light source turned off, the color of the surface of the colored resin sheet in the area corresponding to the light-emitting display unit was measured, and the brightness L * The value was calculated.

[0099] (Measurement of Brightness) The light-emitting surface of the surface-emitting light source of the leather-finish light-emitting display device was illuminated. By turning on the surface-emitting light source, numbers printed as outlined in white were illuminated and displayed so as to stand out in the light-emitting display area, which is the light-transmitting portion corresponding to the surface of the leather-finish light-emitting display device except for the light-shielding portion. In the illuminated display state, the brightness of the light-emitting surface of the light-emitting display device was measured in a darkroom from a distance of 70 cm perpendicular to the light-emitting surface using a spectroradiometer (a two-dimensional spectroradiometer SR-5000HS manufactured by Topcon Technohouse Corporation). The brightness data for each pixel was then averaged for the non-light-emitting display area corresponding to the light-shielding portion and the light-emitting display area corresponding to the light-transmitting portion, and these were designated as brightness Ya and brightness Yb, respectively.

[0100] (Evaluation of leather-like light-emitting display devices) Ten car users were asked to judge the visibility based on the following criteria. The judgment was then determined by majority vote. A: When the surface-emitting light source was turned on, the numbers in the light-emitting display area were displayed with high contrast compared to the non-light-emitting display area, and all numbers were clearly recognizable at a glance. Furthermore, when the light was turned off, the internal structure was not visible through the surface. B: When the surface-emitting light source was turned on, the numbers in the light-emitting display area were displayed with high contrast compared to the non-light-emitting display area, and all numbers were clearly recognizable at a glance. However, when the light was turned off, the internal structure was visible through the surface. C: When the surface-emitting light source was turned on, the numbers in the light-emitting display area were displayed with low contrast compared to the non-light-emitting display area, and it was difficult to clearly recognize the numbers at a glance. On the other hand, when the light was turned off, it was not possible to see the internal structure through the surface. D: When the surface-emitting light source was turned on, the numbers in the light-emitting display area were displayed with high contrast compared to the non-light-emitting display area, but the brightness was too high, making it difficult to recognize details. Also, when the light was turned off, the internal structure was visible through the surface.

[0101] The results are shown in Table 1 below.

[0102]

[0103] Example 2 A leather-look sheet and a leather-look light-emitting display device were manufactured and evaluated in the same manner as in Example 1, except that the luminance of the surface-emitting light source was changed as shown in Table 1. The results are shown in Table 1.

[0104] [Example 3] A leather-look sheet and a leather-look light-emitting display device were produced and evaluated in the same manner as in Example 1, except that the blending ratio of the colorant in the colored resin sheet was changed as shown in Table 1. The results are shown in Table 1.

[0105] [Example 4] A leather-look sheet and a leather-look light-emitting display device were produced and evaluated in the same manner as in Example 1, except that VIVITINT BLACK 856 was changed to dispersion-type perylene black. The results are shown in Table 1.

[0106] Example 5 A leather-look sheet and a leather-look light-emitting display device were produced and evaluated in the same manner as in Example 1, except that the luminance of the surface-emitting light source was changed as shown in Table 1. The results are shown in Table 1.

[0107] Comparative Example 1 A leather-look sheet and a leather-look light-emitting display device were produced and evaluated in the same manner as in Example 1, except that the fiber substrate was changed from a PET nonwoven fabric to a PET knitted fabric. The results are shown in Table 1.

[0108] [Comparative Example 2] A leather-like sheet was produced and evaluated in the same manner as in Example 1, except that the average fiber diameter of the fibers constituting the PET nonwoven fabric of the fibrous substrate was changed from 3.0 μm to 13.6 μm. The results are shown in Table 1.

[0109] Comparative Example 3 A resin solution for forming a colored resin sheet was prepared by dispersing a black pigment (carbon black, Dilac L-1770, manufactured by DIC Corporation) in a 30% by mass polyurethane DMF solution containing non-yellowing polycarbonate-based polyurethane. The resin solution contained 2.0% by mass of carbon black relative to the solid content of the non-yellowing polycarbonate-based polyurethane. A 60 μm-thick colored resin sheet was then formed in the same manner as in Example 1, and a leather-look sheet and a leather-look light-emitting display device were also produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0110] Comparative Example 4 A leather-look sheet and a leather-look light-emitting display device were manufactured and evaluated in the same manner as in Example 1, except that the leather-look sheet was replaced with only a colored resin sheet. The results are shown in Table 1.

[0111] Comparative Example 5 A leather-look sheet and a leather-look light-emitting display device were manufactured and evaluated in the same manner as in Comparative Example 4, except that the luminance of the surface-emitting light source was changed as shown in Table 1. The results are shown in Table 1.

[0112] Referring to Table 1, the luminance Ya of the non-light-emitting display area is 200 cd / m ２ or less, and the luminance Yb ​​of the light-emitting display area is 100 to 2,000 cd / m ２The leather-like light-emitting display devices obtained in Examples 1 to 5, which showed a light-emitting display with a Yb / Ya ratio of 2.0 or more, were all rated A in the visibility evaluation. ２ The comparative examples 1 and 2 were judged as B. The luminance Ya of the non-light-emitting display area was 200 cd / m ２ or less, and the luminance Yb ​​of the light-emitting display area is 100 to 2,000 cd / m ２ However, the leather-like light-emitting display device obtained in Comparative Example 3, which showed a light-emitting display with a Yb / Ya ratio of less than 2.0, was judged as C. In addition, the leather-like light-emitting display device obtained in Comparative Example 3, which did not contain a fiber substrate and had a luminance Ya of 200 cd / m ２ The luminance Yb ​​of the light-emitting display area also exceeds 2,000 cd / m ２ The leather-like light-emitting display device obtained in Comparative Example 4, which showed a light-emitting display in which the luminance Ya of the non-light-emitting display area was 200 cd / m or more, was rated D. ２ or less, and the luminance Yb ​​of the light-emitting display area is 100 to 2,000 cd / m ２ The leather-like light-emitting display device obtained in Comparative Example 5, which exhibited a light-emitting display in which Yb / Ya was 2.0 or more, was also evaluated as B.

[0113] REFERENCE SIGNS LIST 1 Colored resin layer 2 Fiber substrate 3 Light-shielding portion 10 Leather-look sheet 40 Transparent resin layer 50 Surface-emitting light source 51 Lighting cover 52 LED device 53 Surface-mount substrate 60, 61 Adhesive layer 65 Transparent resin layer 70 Light-transmitting leather-look cover 100, 110, 120 Leather-look light-emitting display device L Light-emitting display area NL Non-light-emitting display area

Claims

1. A leather-like sheet which is a laminate of a colored resin layer forming an outer surface layer and a fiber base material, a light-emitting portion disposed under the leather-like sheet, and a light-shielding portion that partially restricts light transmission and is interposed in any layer between the colored resin layer and the light-emitting portion, The luminance Ya of the non-light-emitting display region corresponding to the light-shielding portion, measured from the surface of the colored resin layer, is 200 cd / m ２ or less, and the luminance Yb of the light-emitting display region corresponding to the portion excluding the light-shielding portion is 100 to 2,000 cd / m ２ A leather-like light-emitting display device that exhibits a light-emitting display, where Yb / Ya is 2.0 or more.

2. The lightness L of the light-emitting display region, measured from the surface of the colored resin layer under the condition of using a D65 light source with the light-emitting portion turned off, * The leather-like light-emitting display device according to claim 1, wherein the value is 5 or more and 15 or less.

3. The colored resin layer has an average light transmittance value of 15% or more in the entire visible light region of wavelengths 380 to 780 nm, and an average light transmittance value of 50% or more in the region of wavelengths 680 to 780 nm. The leather-like light-emitting display device according to claim 1.

4. The colored resin layer includes polyurethane and a first colorant dispersed in the polyurethane, and the average dispersed particle diameter of the first colorant is 400 nm or less. The leather-like light-emitting display device according to claim 2.

5. The leather-like light-emitting display device according to claim 4, wherein the first colorant is miscible with the polyurethane at the molecular level.

6. The leather-like light-emitting display device according to claim 4, wherein the first colorant is a pigment in which a polymer segment is bonded to a chromophore.

7. The leather-like light-emitting display device according to claim 1, wherein the light-shielding portion is a printed layer.

8. The leather-like light-emitting display device according to claim 1, wherein the light-shielding portion contains carbon black.

9. The leather-like light-emitting display device according to any one of claims 1 to 8, wherein the fiber substrate is a fiber structure containing fibers having an average fiber diameter of 1.0 to 10.0 μm.

10. The light-emitting portion is a surface light-emitting device having a light-emitting intensity in the range of 500 to 40,000 cd / m ２ The leather-like light-emitting display device according to any one of claims 1 to 8.