Light-emitting display device, and fiber sheet with light-shielding layer for light-emitting display device

Abstract

A light-emitting display device, comprising a light-emitting component and a fiber sheet with a light-shielding layer covering the light-emitting surface of the light-emitting component, wherein the fiber sheet with the light-shielding layer comprises a fiber sheet and a light-shielding layer partially printed on at least one surface of the fiber sheet, and the arithmetic mean height Sa of the surface of the fiber sheet on which the light-shielding layer is formed is 3 to 20 μm based on ISO25178, and the apparent density is 0.5 g / cm 3 above.

Description

Technical Field

[0001] The present invention relates to a light-emitting display device that displays symbols, patterns, and images such as letters and icons by light emission from a light-emitting member. Background Art

[0002] In recent years, a light-emitting display device has been proposed, which uses a light-transmitting sheet to cover a light-emitting component. When the light-emitting component is off, it is difficult to see the existence of the light-emitting component. When the light-emitting body of the light-emitting component is lit, symbols, patterns, and images such as text and icons appear on the surface.

[0003] For example, Patent Document 1 below discloses a synthetic leather, which is formed by laminating a skin layer formed of polyurethane resin on a grey cloth, and has a visible light transmittance of 0.10 to 11.90% in a wavelength range of 380 to 780 nm. Patent Document 1 also discloses that a thick paper cut into a desired shape is pasted, sewn, hooked, or welded to the back side of the grey cloth in order to locally form a light-shielding area.

[0004] In addition, the following patent document 2 discloses a light-transmitting artificial leather sheet using a transparent or translucent elastomer sheet, characterized in that a smoke printing layer is provided on the back or surface of the elastomer sheet, a mask printing layer for embodying text, graphics or patterns, or a combination thereof is provided on the back, i.e., the outermost layer, of the elastomer sheet, and a leather pattern is provided on the surface of the elastomer sheet.

[0005] In addition, the following patent document 3 discloses a leather-like light-emitting sheet, which comprises a light-emitting component and a light-transmitting leather-like sheet comprising a fiber substrate, wherein the light-transmitting leather-like sheet is arranged in a manner to cover the light-emitting component so that the light emitted by the light-emitting component is transmitted through a light-transmitting portion formed in at least one region within the surface. Furthermore, the following is disclosed: a nonwoven fabric comprising ultrafine fibers having a fineness of 0.8 dtex or less and a polymer elastomer, and having an apparent density of 0.5 g / cm 3 The above fiber base material is dense and therefore has excellent dimensional stability, and is also preferred from the viewpoint of excellent precision processing when a thin-walled portion is formed in the region corresponding to the light-transmitting portion by cutting and thinning compared to the region corresponding to the non-light-transmitting portion. In addition, it is disclosed that a light-shielding layer is formed by applying a coating liquid containing a colorant to a fiber base material and drying it.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2013-177714

[0009] Patent Document 2: Japanese Patent Application Publication No. 2014-173203

[0010] Patent Document 3: Japanese Patent Application Publication No. 2016-081817 Summary of the invention

[0011] Problems to be solved by the invention

[0012] As disclosed in Patent Document 3, a fiber sheet with a light-shielding layer obtained by forming a local light-shielding area on a fiber sheet such as a non-woven fabric or a fabric having light transmission is preferably used to manufacture a light-emitting display device that displays characters, icons, and other signs, patterns, and images by light emission from a light-emitting component. In order to form a local light-shielding area on a fiber sheet, a method of forming a light-shielding layer by printing can be considered. According to such a method, a fiber sheet with a light-shielding layer preferably used in a light-emitting display device that displays characters, icons, and other signs, patterns, and images can be easily produced.

[0013] However, when a light-shielding layer for forming a light-shielding region is printed on a conventional fiber sheet, uneven ink loading occurs, thereby making it difficult to form a light-shielding region with less coating unevenness and high light-shielding properties.

[0014] An object of the present invention is to provide a fiber sheet with a light-shielding layer in a light-emitting display device including a fiber sheet with a light-shielding layer formed thereon, the fiber sheet having a light-shielding layer formed by printing and having high light-shielding properties and less coating unevenness.

[0015] Methods used to solve problems

[0016] One aspect of the present invention provides a light-emitting display device, comprising a light-emitting component and a fiber sheet with a light-shielding layer covering the light-emitting surface of the light-emitting component, wherein the fiber sheet with the light-shielding layer comprises a fiber sheet and a light-shielding layer formed by partially printing on at least one surface of the fiber sheet, the arithmetic mean height Sa of the surface of the fiber sheet on which the light-shielding layer is formed based on ISO25178 is 3 to 20 μm, and the apparent density of the fiber sheet is 0.5 g / cm 3 In such a light-emitting display device, when the light-emitting component configured as the backlight of the fiber sheet with the shading layer is made to emit light, the light from the light-emitting component is selectively blocked, so that the symbols, patterns, and images such as characters and icons are displayed in a luminous manner. On the other hand, when the light-emitting component does not emit light, the light-emitting component is covered and hidden by the fiber sheet. Moreover, according to the arithmetic mean height Sa of the surface formed with the shading layer of 3 to 20 μm and the apparent density of 0.5 g / cm 3 The above-mentioned fiber sheet can easily form a light-shielding layer having high light-shielding properties and little coating unevenness by printing.

[0017] In addition, when the light shielding layer is printed on the first surface of the fiber sheet located on the light-emitting surface side, even if the surface resin layer described later is formed on the second surface located on the outer surface side or the design surface subjected to the napping treatment is formed, the design surface will not be affected, and the light shielding layer can be formed on the fiber sheet. In addition, when the light shielding layer is printed on the second surface of the fiber sheet that is not located on the light-emitting surface side, even if the first surface located on the light-emitting surface side is injection molded in order to integrate the transparent resin molded body described later, the printed light shielding layer is not easy to seep out or flow due to the heat and pressure of the injection molding.

[0018] In addition, in the case of a fiber sheet with a light-shielding layer, it is preferred that the second surface of the fiber sheet not located on the light-emitting surface side has a napped surface in which the fibers of the surface layer are napped, so that the appearance of napped leather such as suede-like leather can be formed. In addition, it is preferred that the fiber sheet with a light-shielding layer having a napped surface has a light-transmitting portion having an average light transmittance of 5 to 15%, and further 7 to 12%, in the visible light wavelength range of 380 to 780 nm.

[0019] In addition, in the case of a fiber sheet with a shading layer, when the second surface of the fiber sheet that is not located on the light-emitting surface further has a light-transmitting surface resin layer, by selecting the design of the surface resin layer, it is possible to give the fiber sheet a high-end appearance with a grain leather feel, a wood feel, a stone feel, a metal feel, etc., which is preferred from this aspect.

[0020] In addition, when the fiber sheet comprises a nonwoven fabric of ultrafine fibers having a fineness of 1 dtex or less and a polymer elastic body impregnated into the nonwoven fabric in an amount of 3 to 40% by mass, it is easy to obtain an arithmetic mean height Sa of 3 to 20 μm and an apparent density of 0.5 g / cm 3 The above-mentioned fiber sheets are preferred from this perspective.

[0021] In addition, another aspect of the present invention provides a fiber sheet with a light-shielding layer, which is a fiber sheet with a light-shielding layer used in a light-emitting display device that covers the light-emitting surface of a light-emitting component and selectively transmits the light of the light-emitting component to display a mark, pattern, or image by light emission, and comprises: a fiber sheet having a first surface located on the light-emitting surface side and a second surface located on the outer surface side, and a light-shielding layer partially printed on at least one of the first surface and the second surface, the arithmetic mean height Sa of the surface of the fiber sheet on which the light-shielding layer is formed based on ISO25178 is 3 to 20 μm, and the apparent density of the fiber sheet is 0.5 g / cm 3 above.

[0022] Effects of the Invention

[0023] According to the present invention, in a light-emitting display device including a fiber sheet with a light-shielding layer on which a light-shielding layer is formed, a fiber sheet with a light-shielding layer formed by printing and having less coating unevenness and high light-shielding properties can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a light-emitting display device 10 including the fiber sheet 3 with a light-shielding layer according to the first embodiment.

[0025] Figure 2 Schematic diagram of a fiber sheet 3 with a light-shielding layer.

[0026] Figure 3 1 is a schematic diagram of a light-emitting display device 20 including a fiber sheet 13 with a light-shielding layer according to the second embodiment.

[0027] Figure 4 Schematic diagram of the fiber sheet 13 with a light-shielding layer.

[0028] Figure 5 1 is a schematic diagram of a light-emitting display device 30 including a fiber sheet 23 with a light-shielding layer according to the third embodiment.

[0029] Figure 6 Schematic diagram of the fiber sheet 23 with a light shielding layer.

[0030] Figure 7 Schematic diagram of a light-emitting display device 40 including a fiber sheet 33 with a light-shielding layer according to a fourth embodiment.

[0031] Figure 8 Schematic diagram of the fiber sheet 33 with a light shielding layer.

[0032] Fig. 9 It is a schematic diagram of the grinding process.

[0033] Explanation of symbols

[0034] 1 Fiber sheet

[0035] 2 Shading layer

[0036] 3 Fiber sheet with light-shielding layer

[0037] 4 Surface resin layer

[0038] 5 Light-emitting components

[0039] 5a Light Emitting Diode Device (LED)

[0040] 5b Circuit board

[0041] 10 Light Emitting Display Device of First Embodiment

[0042] 11 Fiber Sheet

[0043] 20 Second Embodiment Light Emitting Display Device

[0044] 30 Light Emitting Display Device of Third Embodiment

[0045] 40 Light Emitting Display Device of Fourth Embodiment

[0046] 50 Base material

[0047] 100 Grinding treatment device

[0048] 111 Delivery roller

[0049] 112 Take-up roller

[0050] 113 crimping roller

[0051] 114 Grinding Roller

[0052] 115 driving roller

[0053] 116 Polishing belt

[0054] D Translucent part

[0055] E Glow DETAILED DESCRIPTION

[0056] Embodiments of the light-emitting display device and the fiber sheet with a light-shielding layer used for manufacturing the light-emitting display device according to the present invention are described.

[0057] Figure 1 is a schematic diagram of a light-emitting display device 10 according to a first embodiment, Figure 1 (a) is a schematic top view showing the light-emitting display device 10 when emitting light, Figure 1 (b) shows Figure 1 (a) Schematic cross-sectional view of the I-I' section.

[0058] Reference Figure 1 (b) The light-emitting display device 10 includes a light-emitting member 5 and a fiber sheet 3 with a light-shielding layer covering the light-emitting surface of the light-emitting member 5. The light-emitting member 5 is a surface light-emitting device in which a plurality of light-emitting diode devices (LEDs) 5a are mounted on a circuit board 5b. Moreover, the LEDs 5a of the light-emitting member 5 emit light by being supplied with power. As the light-emitting member, an image display device such as a light-emitting display device can be used. In addition, the brightness of the light-emitting member is preferably 20 to 200 lumens, and more preferably 30 to 100 lumens, from the perspective of maintaining the shielding property of the light-shielding layer while being able to fully ensure the display performance.

[0059] Figure 2 Schematic diagram of the fiber sheet 3 with a light shielding layer constituting the light-emitting display device 10. Figure 2(a) is a schematic top view showing a fiber sheet 3 with a light-shielding layer, Figure 2 (b) indicates Figure 2 (a) is a schematic cross-sectional view of the II-II' section.

[0060] The fiber sheet 3 with a light-shielding layer includes a fiber sheet 1, which includes a fiber structure such as a nonwoven fabric, a woven fabric, or a knitted fabric. The fiber sheet 1 has a first surface L located on the light-emitting surface side of the light-emitting member 5, and a second surface S located on the outer surface side. The second surface S is a raised nap surface 1a having a suede-like appearance, which is obtained by polishing the fibers forming the surface layer of the fiber sheet 1.

[0061] like Figure 2 As shown in (a), in the fiber sheet 3 with a light shielding layer, as the partially printed light shielding layer 2, a light-transmitting portion D is formed to allow the icons of stop, play, skip one song, return one song, fast forward, and rewind, which represent the operation status of the audio device, to appear. It should be noted that the design of the printed symbols, patterns, and images such as text and icons can be freely selected according to the purpose. It should be noted that "partially" refers to a light-transmitting portion where the light shielding layer is not formed.

[0062] When the light emitted by the light emitting member 5 is irradiated onto the first surface L of the fiber sheet 1, the light is incident on the light-transmitting portion D where the light shielding layer is not formed, and passes through the fiber sheet 1 and is emitted from the second surface S. As for the light transmittance of the fiber sheet 1, the arithmetic mean value of the transmittance in the visible light wavelength range of 380 to 780 nm is preferably 0.1% or more, more preferably 1.0% or more, particularly preferably 5.0% or more, and particularly preferably 10% or more. When the arithmetic mean value of the visible light transmittance of the fiber sheet is too low, there is a tendency that the symbols, patterns, and images such as characters and icons displayed by light emission become unclear. In addition, as for the light transmittance of the light shielding layer, the arithmetic mean value of the transmittance in the visible light wavelength range of 380 to 780 nm is preferably 0.05% or less, and more preferably 0.02% or less.

[0063] As described above, in the fiber sheet 3 with a light-shielding layer, a black light-shielding layer 2 is formed by printing on the portion other than the mark of the icon indicating the operating state of the audio device, i.e., the light-transmitting portion D. The light-shielding layer 2 is formed by printing on the surface of the fiber sheet 1 an ink such as a pigment ink containing a pigment with high shielding properties such as carbon black and titanium oxide and a binder, or a dye ink containing a dark dye with light-shielding properties. In addition, in the fiber sheet 3 with a light-shielding layer, the arithmetic mean height Sa of the surface of the fiber sheet 1 on which the light-shielding layer 2 is formed is 3 to 20 μm. In addition, the apparent density of the fiber sheet 1 is 0.5 g / cm 3 above.

[0064] In addition, refer to Figure 1(b) In the light-emitting display device 10, when current is applied to the LED 5a of the light-emitting member 5 so that the light-emitting surface emits light, light is incident from the first surface of the fiber sheet 3 with the light-shielding layer, which is located on the light-emitting surface side, and the light enters the light-transmitting portion D of the fiber sheet 1 where the light-shielding layer 2 is not formed, passes through the fiber sheet 1, and is emitted from the area of ​​the second surface S as the outer surface side that is opposite to the area of ​​the first surface where the light-shielding layer 2 is not formed, as shown by arrow E. As a result, as shown in FIG. Figure 1 As shown in (a), by the emitted light, an icon indicating the operating state of the audio device appears on the second surface of the outer surface side of the fiber sheet with the light shielding layer 3. It should be noted that when the LED 5a of the light emitting member 5 is turned off, the icon is not easy to identify, and the light emitting member 5 is also not easy to identify from the outside.

[0065] The fiber sheet with a light-shielding layer may further include a light-transmitting surface resin layer on a second surface of the fiber sheet that is not located on the light-emitting surface side, that is, a surface that becomes the outer surface side of the light-emitting display device. Figure 3 1 is a schematic diagram of a light-emitting display device 20 as a second embodiment of such a light-emitting display device. Figure 3 (a) is a schematic top view showing the light-emitting display device 20 when emitting light, Figure 3 (b) Yes Figure 3 (a) is a schematic cross-sectional view of the III-III' section.

[0066] Reference Figure 3 (b) The light-emitting display device 20 includes a light-emitting member 5 and a fiber sheet 13 with a light-shielding layer covering the light-emitting surface of the light-emitting member 5. The light-emitting member 5 is the same as the light-emitting member 5 of the first embodiment. Figure 4 Schematic diagram of the fiber sheet 13 with a light shielding layer constituting the light-emitting display device 20. Figure 4 (a) shows a schematic top view of a fiber sheet 13 with a light-shielding layer, Figure 4 (b) shows Figure 4 (a) is a schematic cross-sectional view of the IV-IV' section.

[0067] The light-emitting display device 20 of the second embodiment has the same structure as the light-emitting display device 10 of the first embodiment, except that a fiber sheet 13 with a shading layer formed by laminating a light-transmitting surface resin layer 4 on the second surface of the fiber sheet 11 is used to replace the fiber sheet 3 with a shading layer whose second surface not located on the light-emitting surface side is a suede-like upright hair surface.

[0068] Furthermore, the fiber sheet with a light-shielding layer may include a light-shielding layer on a second surface of the fiber sheet that is not located on the light-emitting surface side, that is, a surface that becomes the outer surface side of the light-emitting display device. Figure 51 is a schematic diagram of a light-emitting display device 30 according to the third embodiment. Figure 5 (a) is a schematic top view showing the light-emitting display device 30 when emitting light, Figure 5 (b) Yes Figure 5 (a) Schematic cross-sectional view of the V-V' section.

[0069] Reference Figure 5 (b) The light-emitting display device 30 of the third embodiment includes a light-emitting member 5 and a fiber sheet 23 with a light-shielding layer covering the light-emitting surface of the light-emitting member 5. The light-emitting member 5 is the same as the light-emitting member 5 of the first embodiment. Figure 6 Schematic diagram of the fiber sheet 23 with a light shielding layer constituting the light emitting display device 30. Figure 6 (a) is a schematic top view of a fiber sheet 23 with a light-shielding layer. Figure 6 (b) shows Figure 6 (a) is a schematic cross-sectional view of the VI-VI' section.

[0070] The light-emitting display device 30 of the third embodiment has the same structure as the light-emitting display device 20 of the second embodiment, except that a fiber sheet 23 with a shading layer is used in which a shading layer 12 is formed on the second surface of the fiber sheet 11 which is not on the light-emitting surface side, instead of forming the shading layer 2 on the first surface of the fiber sheet 11 which is on the light-emitting surface side.

[0071] According to the use Figure 5 and Figure 6 In the light-emitting display device 30 of the third embodiment, in which the light-shielding layer 12 is formed on the second surface of the fiber sheet 11 which is not located on the light-emitting surface side, the light-shielding layer 12 is formed at a position close to the outer surface of the fiber sheet 11, so the outline of the light E becomes clear. It should be noted that according to the light-emitting display device 10 and the light-emitting display device 20 of the first embodiment and the second embodiment, since the light incident from the light-shielding layer 2 is diffused inside the fiber sheet 1 or 11, there is a tendency that the outline of the light E is slightly unclear compared with the light-emitting display device 30 of the third embodiment.

[0072] The light-emitting display device 40 of the fourth embodiment has the same structure as the light-emitting display device 20 of the second embodiment, except that a fiber sheet 33 with a shading layer is used, in which a shading layer 2 is formed on the first surface of the fiber sheet 11 on the side of the light-emitting surface, and a shading layer 12 is also formed on the second surface of the fiber sheet 11 that is not on the side of the light-emitting surface.

[0073] Used Figure 7 and Figure 8The light-emitting display device 40 of the fourth embodiment, in which the light-shielding layer 12 is formed on both the first surface of the fiber sheet 11 located on the light-emitting surface side and the second surface not located on the light-emitting surface side, realizes the following light emission. The light-shielding layer 2 improves the directivity of the incident light on the first surface. In addition, as in the light-emitting display device 30 of the third embodiment, by forming the light-shielding layer 12 on the second surface close to the outer surface, the outline of the light E is clearer than that of the light-emitting display device 30. In addition, when the light-shielding layer on the first surface and the light-shielding layer on the second surface are designed to be different from each other, a design with a higher degree of freedom can be achieved.

[0074] The basic configurations of the light emitting display devices according to the first to fourth embodiments have been described above in their entirety. Next, the fiber sheet with a light shielding layer, which is a feature of the light emitting display device according to each embodiment, will be described in detail along with its manufacturing method.

[0075] The fiber sheet used for manufacturing the fiber sheet with the light-shielding layer comprises a fiber structure such as a non-woven fabric, a woven fabric, or a knitted fabric, and a polymer elastomer is impregnated into the gaps of the fiber structure as required. Among the fiber structures, a non-woven fabric is preferred, and a non-woven fabric of ultrafine fibers with a fineness of less than 1 dtex is particularly preferred. The non-woven fabric of ultrafine fibers is easy to increase the fiber density, increase the apparent density, and easily reduce the uneven density of the fibers, making the surface smooth. The following is a detailed description of the case of using a fiber substrate containing a non-woven fabric of ultrafine fibers as a representative example.

[0076] The nonwoven fabric of ultrafine fibers is obtained by entangling ultrafine fiber-generating type fibers such as island-type (matrix-microdomain) composite fibers and performing an ultrafine fiberization treatment. It should be noted that in the present embodiment, the case of using island-type composite fibers is described in detail. It should be noted that ultrafine fiber-generating type fibers other than island-type composite fibers can also be used to replace the island-type composite fibers. In addition, ultrafine fibers can also be spun without using ultrafine fiber-generating type fibers. As specific examples of ultrafine fiber-generating type fibers other than island-type composite fibers, there can be cited peelable split type fibers, petal type fibers, etc. The peelable split type fibers are formed by lightly bonding a plurality of ultrafine fibers immediately after spinning, and can be untied by mechanical operation to form a plurality of ultrafine fibers. The petal type fibers are formed by alternately aggregating a plurality of resins into petal shapes in the melt spinning process.

[0077] In the manufacture of ultrafine fiber nonwoven fabrics, first, a thermoplastic resin that constitutes a sea component (matrix component) of the island-in-sea type composite fiber and a thermoplastic resin that constitutes an island component (micro-region component) of the island-in-sea type composite fiber, which can be selectively removed, are melt-spun and stretched to produce an island-in-sea type composite fiber, wherein the island component of the island-in-sea type composite fiber is a resin component that forms the ultrafine fibers.

[0078] As the thermoplastic resin of the sea component, a thermoplastic resin having different solubility in a solvent or decomposition in a decomposing agent from the resin of the island component can be selected. Specific examples of the thermoplastic resin constituting the sea component include water-soluble polyvinyl alcohol resins, polyethylene, polypropylene, polystyrene, ethylene-propylene resins, ethylene-vinyl acetate resins, styrene-ethylene resins, styrene-acrylic resins, and the like.

[0079] As the resin component that forms the island component and forms the ultrafine fiber, that is, the thermoplastic resin, there is no particular limitation as long as it is a resin that can form the island-type composite fiber and the ultrafine fiber. Specifically, for example, aromatic polyesters such as polyethylene terephthalate (PET), isophthalic acid-modified PET, sulfoisophthalic acid-modified PET, polybutylene terephthalate, and polyhexamethylene terephthalate; aliphatic polyesters such as polylactic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, and polyhydroxybutyrate-polyhydroxyvalerate resins; polyamides such as polyamide 6, polyamide 66, polyamide 10, polyamide 11, polyamide 12, and polyamide 6-12; polyolefins such as polypropylene, polyethylene, polybutene, polymethylpentene, and chlorinated polyolefins, etc. These can be used alone or in combination of two or more.

[0080] As a method for manufacturing an ultrafine fiber nonwoven fabric, for example, a method of melt-spinning sea-island type composite fibers to manufacture a web, subjecting the web to an entanglement treatment, and then selectively removing the sea component from the sea-island type composite fibers to form ultrafine fibers can be cited. As a method for manufacturing a web, a method of forming a long fiber web by capturing long fiber sea-island type composite fibers spun by a spunbond method or the like on a web without cutting them, a method of forming a short fiber web by cutting long fibers into short fibers, etc. Among them, a long fiber web is particularly preferred from the perspective of easily increasing the fiber density, increasing the apparent density, and easily reducing the uneven density of the fibers to make the surface smooth. In addition, in order to impart morphological stability, the formed web may also be subjected to a fusion treatment.

[0081] It should be noted that long fibers do not refer to short fibers that are intentionally cut after spinning, but to continuous fibers. More specifically, for example, they refer to fibers that are not intentionally cut into short fibers with a fiber length of about 3 to 80 mm. The fiber length of the island-in-the-sea composite fiber before ultrafine fiberization is preferably 100 mm or more, which is technically possible to manufacture, and as long as it is not inevitably cut during the manufacturing process, it can also reach a fiber length of several meters, hundreds of meters, thousands of meters or longer. It should be noted that due to the needle punching and surface polishing during the entangling process described later, sometimes a part of the long fiber is inevitably cut to form short fibers during the manufacturing process.

[0082] In any process until the sea component of the island-in-sea composite fiber is removed to form ultrafine fibers, the island-in-sea composite fiber can be made dense by performing fiber shrinkage treatment such as entanglement treatment and heat shrinkage treatment using water vapor. As an example of the entanglement treatment, there can be mentioned a method of stacking about 5 to 100 webs and performing needle punching or high-pressure water jet treatment.

[0083] The sea component of the sea-island composite fiber is dissolved or decomposed at an appropriate stage after forming the web, and is extracted and removed. By such decomposition and removal or dissolution and removal, the sea-island composite fiber is ultrafinely fibrous, forming a nonwoven fabric of ultrafine fibers in the form of fiber bundles. The apparent density of the nonwoven fabric of ultrafine fibers in the form of fiber bundles can also be further increased by heat shrinking treatment, heating rollers or heating presses.

[0084] The fineness of the ultrafine fibers is not particularly limited, but is preferably 1 dtex or less, more preferably 0.01 to 0.6 dtex, and particularly preferably 0.02 to 0.5 dtex, from the perspective of easily increasing the fiber density of the ultrafine fibers and thus increasing the apparent density, thereby making it easier for the ink used to print the light-shielding layer to penetrate into the fiber sheet through capillary phenomena.

[0085] In order to impart shape stability and a sense of fullness, a polymer elastic body may be contained in the gaps between fibers of a fiber structure such as a nonwoven fabric as required. The type of polymer elastic body is not particularly limited. Specific examples thereof include various polyurethanes such as polycarbonate polyurethane, polyester polyurethane, and polyether polyurethane; acrylic elastomer; polyurethane acrylic composite elastomer; polyvinyl chloride; synthetic rubber, etc. Among them, polyurethane is preferred in terms of excellent adhesion and mechanical properties.

[0086] As a method for imparting a polymer elastomer to a fiber structure such as a nonwoven fabric, there can be cited a method of impregnating a fiber structure with a solution or emulsion of a polymer elastomer and then coagulating the polymer elastomer. As a method for impregnating a fiber structure with a solution or emulsion of a polymer elastomer, it is preferred to adopt an immersion and clamping method in which a solution or emulsion is impregnated once or multiple times in a manner such that the fiber structure becomes a given impregnation state and then squeezed using a pressure roller or the like. In addition, as other methods, a rod coating method, a knife coating method, a roller coating method, a notched wheel coating method, a spray coating method, etc. can also be adopted.

[0087] The fiber structure can be provided with the polymeric elastic body by impregnating the fiber structure with a solution or an emulsion of the polymeric elastic body and thereby coagulating the polymeric elastic body.

[0088] The content of the polymer elastic body in the fiber sheet is preferably 3 to 40% by mass, more preferably 8 to 35% by mass, and particularly preferably 12 to 30% by mass, from the viewpoint that the apparent density of the fiber sheet becomes higher by increasing the fiber density and the ink for printing the light-shielding layer easily penetrates by capillary action.

[0089] In this way, a fiber sheet substrate can be obtained. The obtained fiber sheet substrate can be subjected to slicing treatment, grinding treatment, etc. to adjust the thickness as needed.

[0090] Then, the base material of the fiber sheet is further pressed to adjust the apparent density. Specifically, by pressing the base material of the fiber sheet at room temperature or hot pressing with heating, the voids in the base material of the fiber sheet are reduced and the fiber density of the fiber structure is increased. The pressing device is not particularly limited, and preferably a manual press or a roller press is used.

[0091] In the case of pressing, the pressing pressure is preferably 5 to 20 MPa, more preferably 8 to 15 MPa, from the perspective of maintaining the appearance quality. In addition, in the case of hot pressing, the set temperature of the heating roller is preferably 100 to 150° C., more preferably 110 to 120° C., from the perspective of maintaining the appearance quality.

[0092] The apparent density of the fiber sheet after pressing was 0.50 g / cm 3 Above, preferably 0.50 to 0.95 g / cm 3 , particularly preferably 0.50 to 0.90 g / cm 3 The apparent density of the fiber sheet after pressing is less than 0.50 g / cm 3 In the case of a thin film, the fiber density is low, so the ink used to print the light-shielding layer has less penetration in the thickness direction due to capillary phenomenon and is easily diffused in the surface direction. For this reason, it is difficult to evenly apply the ink in a manner that can form a light-shielding layer with high light-shielding properties and less uneven coating.

[0093] In order to make the surface of the fiber sheet on which the light-shielding layer is printed smooth, it is preferred that the surface of the fiber sheet on which the light-shielding layer is printed be smoothed by grinding.

[0094] As a method for grinding the surface of the printed light-shielding layer to make it smooth, the following method can be cited: a rotating grinding roller covered with sandpaper is brought into contact with the surface of the printed light-shielding layer of the base material of the fiber sheet to perform grinding. By such grinding, the surface of the printed light-shielding layer of the base material of the fiber sheet is made smooth.

[0095] Fig. 9FIG. 1 is an example of a process diagram showing a polishing process using a polishing device 100 for polishing the surface N of the printed light shielding layer of the base material 50 of the fiber sheet. Fig. 9 As shown, the polishing device 100 includes a feed roller 111 for feeding the substrate 50, a take-up roller 112 for taking up the substrate 50, a pressure roller 113, a polishing roller 114, a driving roller 115, and a polishing belt 116. The substrate 50 is conveyed in a travel direction A toward the take-up roller 112.

[0096] The polishing belt 116 is an endless belt with a sandpaper surface, and is mounted on the grinding roller 114 and the driving roller 115. A rotation drive motor that rotates a shaft (not shown) is connected to the driving roller 115, and the driving roller 115 is rotated by the rotation of the shaft, thereby rotating the polishing belt 116 mounted on the grinding roller 114 and the driving roller 115.

[0097] The grinding roller 114 and the pressure roller 113 are arranged to face each other with the substrate 50 interposed therebetween. The pressure roller 113 is a rubber roller with a smooth circumferential surface. The pressure roller 113 presses the substrate 50 in the direction D. The pressure roller 113 rotates in the rotation direction C, and the grinding roller 114 rotates in the rotation direction B.

[0098] The substrate 50 is fed from the feed roller 111 to the take-up roller 112 in the direction A while tension is applied thereto. Then, the substrate 50 is fed from the feed roller 111 and taken up by the take-up roller 112. In the process from feeding to taking up, the sandpaper of the rotating polishing belt 116 mounted on the polishing roller 114 is brought into contact with the surface N of the printed light-shielding layer of the substrate 50, thereby performing a polishing treatment.

[0099] The polishing tape 116 has, on the outer periphery, sandpaper of, for example, about #120 to #600 with fine abrasive grains adhered thereto.

[0100] The load current applied to the polishing roller 114 can be adjusted by adjusting the pressure in the direction D applied to the surface N of the printed light shielding layer of the substrate 50 between the pressure roller 113 and the polishing roller 114. When the load current is too low or too high, operation with a stable current value becomes difficult.

[0101] The rotation speed of the grinding roller 114 depends on the diameter of the grinding roller and the type of sandpaper, and is preferably 300 to 1500 rpm, and more preferably 300 to 1000 rpm. The conveying speed of the substrate 50 also depends on the diameter of the grinding roller and the type of sandpaper, and is preferably 2 to 10 m / min, and more preferably 3 to 6 m / min.

[0102] When the substrate 50 sent out from the delivery roller 111 is subjected to a grinding process, the shear force applied by the polishing belt 116 to the surface N of the printed light-shielding layer of the substrate 50 can be adjusted by changing the rotation speed and load current of the grinding roller 114 and the conveying speed of the substrate 50. When the rotation speed, current value and conveying speed of the grinding roller 114 are large, the shear force increases, and when the rotation speed, current value and conveying speed of the grinding roller 114 are small, the shear force decreases.

[0103] By the polishing treatment as described above, the surface of the printed light-shielding layer of the fiber sheet becomes smooth. For the surface of the light-shielding layer of the fiber sheet adjusted in this way, the arithmetic mean height Sa based on ISO 25178 is 3 to 20 μm, preferably 3 to 12 μm. It should be noted that the arithmetic mean height (Sa) based on ISO 25178 is a parameter representing the average of the absolute values ​​of the differences between the heights of each point and the average surface of the surface.

[0104] When the arithmetic mean height Sa of the surface of the fiber sheet forming the light shielding layer exceeds 20 μm, the surface on which the light shielding layer is printed is too fuzzy and lacks a smooth feel, and the ink is not accurately brushed onto the printed surface during printing, causing the ink to spread. As a result, the thickness of the formed light shielding layer is uneven, causing uneven light emission. In addition, when the arithmetic mean height Sa of the surface of the fiber sheet forming the light shielding layer is less than 3 μm, after the ink is applied, the anchoring effect is difficult to exert, and the fixation of the ink is reduced.

[0105] Thus, a fiber sheet for forming a light-shielding layer can be obtained. The thickness of the fiber sheet can be appropriately adjusted according to the target visible light transmittance and the application, and is preferably 0.1 to 3 mm, more preferably 0.15 to 1 mm, and particularly preferably 0.2 to 0.9 mm. When the fiber sheet is too thick, the light transmittance tends to decrease.

[0106] Then, by printing a shading layer on the surface of the obtained fiber sheet whose arithmetic mean height Sa is adjusted to 3 to 20 μm, a fiber sheet with a shading layer is obtained, which is used in a light-emitting display device that covers the light-emitting surface of the light-emitting component and selectively transmits the light of the light-emitting component to display symbols, patterns, and images such as text and icons.

[0107] The light-shielding layer is formed by printing symbols, patterns, and images such as characters and icons to be displayed by light emission using ink on the surface of the fiber sheet whose arithmetic mean height Sa is adjusted to 3 to 20 μm. Printing methods used in printing the light-shielding layer include screen printing, gravure printing, inkjet printing, etc. Among these methods, screen printing is preferred because the light-shielding layer can be stably applied by a relatively inexpensive process and the printing mass productivity is excellent.

[0108] The ink used for printing the light-shielding layer can be a pigment ink containing a pigment with high shielding properties such as carbon black and titanium oxide and a binder such as acrylic resin, or a dye ink containing a dark dye. In addition, the viscosity of the ink used for printing can be designed to a preferred range according to the printing method. In the case of screen printing, the viscosity of the coating ink after dilution with a solvent is preferably about 10 to 100 Pa·sec from the perspective of appropriate penetration into the fiber sheet.

[0109] The thickness of the light shielding layer formed in this way is preferably about 5 to 80 μm, more preferably about 20 to 50 μm.

[0110] In addition, as shown in the light-emitting display device 20 of the second embodiment and the light-emitting display device 30 of the third embodiment, a light-transmitting surface resin layer 4 may be formed on the second surface of the fiber sheet 11 .

[0111] The surface resin layer 4 is a light-transmitting resin layer for imparting a high-end design appearance such as grain leather, wood, stone, or metal. By laminating the light-transmitting surface resin layer on the second surface of the fiber sheet 11 that is not located on the light-emitting surface side and is the outer surface side, the light-emitting display device can be imparted with a high-end design appearance such as grain leather, wood, stone, or metal.

[0112] As a method for forming a surface resin layer, the following method can be cited: a method of forming a resin layer containing a light-transmitting polymer elastic body such as polyurethane on the surface of a fiber sheet by a dry surfacing method, a direct coating method, or the like. The dry surfacing method is a method in which a resin film containing a polymer elastic body is formed on a supporting substrate such as release paper, an adhesive is coated on the surface of the resin film, and the film is laminated to the surface of the fiber sheet, and pressed and bonded as needed, and the release paper is peeled off, thereby forming a light-transmitting surface resin layer. Alternatively, the direct coating method is a method in which a liquid resin or resin liquid containing a polymer elastic body is directly coated on the surface of the fiber sheet and then cured, thereby forming a surface resin layer.

[0113] As the polymer elastomer used to form the surface resin layer, polyurethane, acrylic elastomer, etc. can be used. The surface resin layer is selected from a material with light transmittance. The type of polymer elastomer used to form such a surface resin layer is not particularly limited. Specific examples thereof include: various polyurethanes such as polycarbonate polyurethane, polyester polyurethane, polyether polyurethane; acrylic elastomer; polyurethane acrylic composite elastomer; polyvinyl chloride elastomer; synthetic rubber, etc. These polymer elastomers can be used alone or in combination of two or more. Among them, polyurethane is preferred in terms of excellent mechanical properties such as wear resistance and bending resistance. The thickness of the surface resin layer is not particularly limited, for example, it is preferably about 20 to 200 μm. In addition, the surface resin layer can also be formed in a manner in which the erected hairs of the fiber sheet coexist.

[0114] The light transmittance of the surface resin layer is preferably such that the visible light transmittance of the light-transmitting portion of the fiber sheet with a light-shielding layer is 0.1% or more, further 1.0% or more, particularly 5.0% or more, and most preferably 10% or more.

[0115] The light-emitting display device described above can be appropriately modified in its structure according to the purpose and use. Specifically, for example, a transparent resin molded body can be integrated with the surface layer of the first surface of the fiber sheet on the light-emitting surface side. Specifically, in the mold cavity of the mold for in-mold molding, the second surface of the fiber sheet that is not located on the light-emitting surface side with the light-shielding layer is arranged in a manner opposite to the mold cavity surface, and the transparent resin is injected into the mold cavity to perform injection molding, thereby integrating the transparent resin molded body with light transmissivity with the first surface on the light-emitting surface side.

[0116] The light emitting device according to the above-described embodiment can form a surface for light emitting display in the interior decoration of household electrical appliances, automobiles, airplanes, ships, buildings, and the like.

[0117] Example

[0118] The present invention will be described in more detail below by way of examples. It should be noted that the scope of the present invention is not limited by these examples.

[0119] First, the evaluation method used in the present example is summarized and described below.

[0120] (Arithmetic mean height Sa)

[0121] The arithmetic mean height Sa of the printed surface of the light shielding layer of the fiber sheet was measured based on ISO 25178 using a non-contact surface roughness / shape measuring machine "Digital Microscope VHX-6000" (manufactured by KEYENCE). Specifically, the printed surface of the light shielding layer of the fiber sheet was tacked 10 times along the grain direction using a polyester brush (Etiquette Brush (registered trademark), commonly known as Seal Brush, manufactured by Nippon Seal Co., Ltd.), and a distorted fringe projection image of the 18 mm × 24 mm range of the tacked surface was taken at a magnification of 100 times using a 4 million pixel monochrome C-MOS camera using structured illumination light irradiated from a high-brightness LED. Then, the obtained image was analyzed and processed to obtain the arithmetic mean height (Sa). The measurement was performed 3 times, and the average value was used as each value.

[0122] (Apparent density)

[0123] Thickness (mm) and weight per unit area (g / m2) were measured according to JIS L 1913. 2 ), and the apparent density (g / cm 3 ).

[0124] (fineness)

[0125] For the fineness, a scanning electron microscope (SEM) photograph of a cross section of the napped artificial leather was taken at 3000 times, 10 fiber cross sections were randomly selected and the cross-sectional area was measured, the average value of the cross-sectional area was calculated, and the fineness was calculated by conversion based on the density of each resin.

[0126] (Light Transmittance)

[0127] The light transmittance of the light-transmitting portion of the fiber sheet was evaluated by measuring the transmittance in the visible light wavelength range of 380 to 780 nm using a spectrophotometer U-4100 (Hitachi High-Tech Sciences). The average value was calculated to obtain the visible light transmittance.

[0128] (Coating properties)

[0129] On the surface of each fiber sheet on which the light-shielding layer was printed, a light-shielding layer having a thickness of about 20 μm was screen-printed using black ink and a screen printing plate (T-270) in a 100 mm square. The presence or absence of uneven application of the black ink was determined by visual observation based on the following criteria.

[0130] A: Apply evenly

[0131] B: Uncoated parts / uneven coating

[0132] (Light blocking properties)

[0133] The light source was irradiated from the printed surface of the screen-printed fiber sheet with a light-shielding layer, and the degree of light transmission when viewed from the opposite side was determined by naked eye according to the following criteria. The light source was set to a circular shape with a brightness of 40 lumens and a diameter of 3.5 mm, and the distance from the sample was set to 1.0 mm.

[0134] A: It is completely opaque.

[0135] B: Transmitted to such an extent that the outline of the light source is not clear.

[0136] C: Transmitted to the extent that the outline of the light source is clear.

[0137] [Example 1]

[0138] Ethylene-modified polyvinyl alcohol as a thermoplastic resin of the sea component and isophthalic acid-modified polyethylene terephthalate with a Tg of 110°C as a thermoplastic resin of the island component are melted separately. Then, each molten resin is supplied to a composite spinning nozzle, which has a plurality of nozzle holes arranged in parallel to form a cross section of 25 island components with uniform cross-sectional areas distributed in the sea component. At this time, the supply is performed while adjusting the pressure so that the mass ratio of the sea component to the island component becomes sea component / island component=25 / 75. Then, the molten resin is ejected from the nozzle hole set to a nozzle temperature of 260°C.

[0139] Then, the molten resin ejected from the nozzle hole was sucked and stretched by a jet nozzle type suction device in which the air flow pressure was adjusted so that the average spinning speed became 3700m / min, and the island-in-the-sea composite long fibers with an average fineness of 2.1dtex were spun. The island-in-the-sea composite long fibers obtained by spinning were continuously deposited on a movable net while being sucked from the back of the net. Then, in order to suppress the burrs on the surface, the accumulated island-in-the-sea composite long fibers on the net were gently pressed with a 42°C metal roller. Then, the island-in-the-sea composite long fibers were peeled off from the net and passed between a metal roller with a lattice pattern and a back roller with a surface temperature of 75°C, thereby performing hot pressing with a linear pressure of 200N / mm. Thus, a long fiber net was obtained.

[0140] Next, after spraying an oil mixed with an antistatic agent on the surface of the obtained long fiber web, 10 long fiber webs were stacked using a stacking device to produce a stacked web, and an anti-needle breakage oil was further sprayed. Then, the stacked web was needle-punched to perform a three-dimensional entanglement treatment to obtain an entangled web.

[0141] The obtained entangled web was densified by performing a wet heat shrinkage treatment as described below. Specifically, 10% by mass of water at 18°C ​​was uniformly sprayed on the entangled web, and the web was left to stand for 3 minutes in an atmosphere of a temperature of 70°C and a relative humidity of 95% without applying tension for heat treatment, thereby causing wet heat shrinkage and increasing the apparent fiber density. Then, dry heat roll pressing was performed to further densify the entangled web.

[0142] Next, the densified entangled web was impregnated with polyurethane as follows: a polyurethane emulsion (30% solid content concentration) mainly composed of polycarbonate / ether polyurethane was impregnated into the densified entangled web. Then, the water was dried in a drying oven at 150°C to further crosslink the non-foamed polyurethane.

[0143] The obtained composite of polyurethane and entangled web was immersed in 95° C. hot water for 20 minutes to extract and remove the sea component contained in the island-in-the-sea composite long fibers, and then dried in a drying oven at 120° C. Thus, a fiber sheet substrate having a thickness of about 1.50 mm was obtained.

[0144] Then, the substrate of the fiber sheet with a thickness of about 1.50 mm is sliced ​​into two halves. Then, the surface of the substrate of the fiber sheet, which is located on the light-emitting surface side of the light-emitting component described later and on which the light-shielding layer is printed, i.e., the first surface, is polished in a flat manner using #120 sandpaper. The polishing conditions are as follows: the rotation speed of the polishing roller is set to 650±50rpm, the rotation direction is set to the opposite direction relative to the traveling direction of the fiber sheet, the conveying speed of the substrate is set to 3m / min, and the treatment is performed twice in such a way that the measured value of the thickness becomes 0.36±0.03mm, which is the target thickness. In addition, for the polishing treatment of the second surface of the light-emitting component that is not located on the light-emitting surface side and becomes the outer surface side of the light-emitting display device, it is carried out under the same conditions as the first surface except that the sandpaper is changed to #240.

[0145] Then, the mold temperature of the manual press was set to room temperature, and the surface pressure was set to 8.8 MPa, and the fiber sheet was pressed.

[0146] Fiber sheet A is a nonwoven fabric composed of ultrafine fibers with a fineness of 0.08 dtex and a polyurethane impregnated into the nonwoven fabric, with a thickness of 0.35 mm and an apparent density of 0.515 g / cm 3 The fiber sheet A has a surface on which the light shielding layer is printed, and the arithmetic mean height Sa based on ISO 25178 is 8.8 μm, and the opposite surface is formed into a suede-like napped surface with an arithmetic mean height Sa of 13.4 μm.

[0147] The results are shown in the following Table 1. The fiber sheet A is a fiber sheet that exhibits good coating properties and high light-shielding properties.

[0148]

[0149] [Example 2]

[0150] The same method as in Example 1 was carried out except that the pressing temperature was changed to 110°C instead of room temperature to produce a fiber sheet B. The fiber sheet B had a thickness of 0.23 mm and an apparent density of 0.815 g / cm2 and had a nonwoven fabric including ultrafine fibers with a fineness of 0.08 dtex and polyurethane impregnated into the nonwoven fabric. 3 The fiber sheet B has a printed light-shielding layer with a suede-like napped surface having an arithmetic mean height Sa of 5.6 μm based on ISO 25178, and the opposite surface thereof has a suede-like napped surface with an arithmetic mean height Sa of 5.2 μm. The results are shown in Table 1. The fiber sheet B is a fiber sheet having good coating properties and high light-shielding properties.

[0151] [Example 3]

[0152] The same procedure as in Example 1 was carried out except that the pressing temperature was changed to 140°C instead of room temperature to produce a fiber sheet C. The fiber sheet C had a thickness of 0.22 mm and an apparent density of 0.853 g / cm2 and had a nonwoven fabric including ultrafine fibers having a fineness of 0.08 dtex and polyurethane impregnated into the nonwoven fabric. 3 The fiber sheet C has a printed light-shielding layer with a suede-like napped surface having an arithmetic mean height Sa of 4.2 μm based on ISO 25178, and the opposite surface thereof has a suede-like napped surface with an arithmetic mean height Sa of 4.1 μm. The results are shown in Table 1. The fiber sheet C is a fiber sheet having good coating properties and high light-shielding properties.

[0153] [Example 4]

[0154] The same method as in Example 1 was followed except that the printed surface was polished with #120 sandpaper after pressing to produce a fiber sheet D. The fiber sheet D was a nonwoven fabric containing ultrafine fibers with a fineness of 0.08 dtex and a nonwoven fabric impregnated with polyurethane having a thickness of 0.36 mm and an apparent density of 0.535 g / cm 3 The fiber sheet D has a printed light-shielding layer with an arithmetic mean height Sa of 17.8 μm based on ISO 25178, and the opposite side has a suede-like napped surface with an arithmetic mean height Sa of 14.1 μm. The results are shown in Table 1. The fiber sheet D is a fiber sheet that exhibits good coating properties and high light-shielding properties.

[0155] [Example 5]

[0156] A polycarbonate-based non-yellowing polyurethane resin solution was applied to the surface of the release paper and dried at 80°C for 10 minutes to form a polyurethane film with a thickness of 30 μm. Then, a polycarbonate-based non-yellowing two-component curable polyurethane solution as an adhesive layer was further applied to the surface of the formed polyurethane film and dried at 50°C for 3 minutes to form an adhesive layer with a thickness of 70 μm. Thus, a flat resin layer with a thickness of 100 μm was formed.

[0157] Then, the surface of the fiber sheet A obtained in Example 1 having an arithmetic mean height Sa of 13.4 μm was bonded to a grain-like resin layer formed on a release paper, and heated at 80° C. for 2 minutes. Thus, a fiber sheet E of artificial leather having a grain-like resin layer having a thickness of 0.45 mm was prepared. The fiber sheet E was a nonwoven fabric impregnated with polyurethane and had an apparent density of 0.540 g / cm 3 The arithmetic mean height Sa of the surface of the printed light-shielding layer of the fiber sheet E according to ISO 25178 was 9.1 μm. The results are shown in Table 1. The fiber sheet E is a fiber sheet that exhibits good coating properties and high light-shielding properties.

[0158] [Comparative Example 1]

[0159] A fiber sheet F was produced in the same manner as in Example 1 except that the pressing treatment was not performed. The fiber sheet F had a thickness of 0.41 mm and an apparent density of 0.452 g / cm2 and had a nonwoven fabric including ultrafine fibers having a fineness of 0.08 dtex and polyurethane impregnated into the nonwoven fabric. 3 The fiber sheet F has a printed light-shielding layer with an arithmetic mean height Sa of 8.6 μm based on ISO 25178, and the opposite side thereof has a suede-like napped surface with an arithmetic mean height Sa of 12.4 μm. The results are shown in Table 1. The fiber sheet F has no uneven coating and good coating properties, but when irradiated with light from a light source, a small amount of light leakage is confirmed in the light-shielding layer, and the light-shielding property is low.

[0160] [Comparative Example 2]

[0161] The same method as in Example 1 was used except that the pressing treatment was not performed and the surface on which the light shielding layer was printed, that is, the first surface, was polished with #100 sandpaper instead of #120 sandpaper to produce a fiber sheet G. The fiber sheet G was a nonwoven fabric containing ultrafine fibers with a fineness of 0.08 dtex and a nonwoven fabric impregnated with polyurethane having a thickness of 0.41 mm and an apparent density of 0.466 g / cm 3The fiber sheet G has a surface with a printed light-shielding layer and an arithmetic mean height Sa based on ISO 25178 of 21.7 μm, and the opposite surface thereof is formed into a suede-like nap surface with an arithmetic mean height Sa of 12.7 μm. The results are shown in Table 1. The fiber sheet G has uneven coating, poor coating properties, and very little light leakage is confirmed in the light-shielding layer when irradiated with light from a light source, and the light-shielding property is also low.

[0162] [Comparative Example 3]

[0163] A fiber sheet H was produced in the same manner as in Example 1 except that the manufacturing conditions of the fiber sheet substrate were changed to include a nonwoven fabric containing ultrafine fibers having a fineness of 0.05 dtex and polyurethane impregnated into the nonwoven fabric, and that the pressing treatment was not performed, and that the surface on which the light shielding layer was printed, that is, the first surface, was polished with #100 sandpaper instead of #120 sandpaper. The fiber sheet H had a thickness of 0.41 mm and an apparent density of 0.582 g / cm 3 The fiber sheet H has a surface with a light-shielding layer printed thereon, and the arithmetic mean height Sa based on ISO 25178 is 24.2 μm, and the opposite surface is formed into a suede-like nap surface with an arithmetic mean height Sa of 12.8 μm. The results are shown in Table 1. The fiber sheet H has good light-shielding properties, but has uneven coating.

[0164] [Comparative Example 4]

[0165] The apparent density was 0.429 g / cm 3 The fiber sheet I as a grain-like artificial leather has a polyurethane resin layer with a thickness of 0.57 mm on the surface of a nonwoven fabric impregnated with polyurethane. The arithmetic mean height Sa of the surface of the printed light-shielding layer of the fiber sheet I based on ISO 25178 is 34.5 μm. The results are shown in Table 1. The fiber sheet I has uneven coating, and when irradiated with light from a light source, the boundary between the light-shielding layer and the light-transmitting part is unclear and lacks shielding properties.

[0166] [Comparative Example 5]

[0167] The same method as in Example 2 was followed except that a small amount of polyurethane was applied to the surface on which the light-shielding layer was printed, i.e., the first surface, for filling treatment to make it smooth after polishing, to produce a fiber sheet J. The fiber sheet J was a nonwoven fabric comprising ultrafine fibers having a fineness of 0.08 dtex and a nonwoven fabric impregnated with polyurethane having a thickness of 0.21 mm and an apparent density of 0.891 g / cm 3The fiber sheet J has a printed light-shielding layer with an arithmetic mean height Sa of 2.5 μm based on ISO 25178, and the opposite side thereof has a suede-like nap layer with an arithmetic mean height Sa of 4.9 μm. The results are shown in Table 1. The fiber sheet J has good light-shielding properties, but has uneven coating.

Claims

1. A light-emitting display device comprising a light-emitting member and a fiber sheet with a light-shielding layer covering a light-emitting surface of the light-emitting member, wherein: The fiber sheet with a light-shielding layer comprises a fiber sheet and a light-shielding layer partially printed on at least one side of the fiber sheet. The arithmetic mean height Sa of the surface of the fiber sheet on which the light shielding layer is formed is 3 to 20 μm based on ISO 25178, and the apparent density of the fiber sheet is 0.5 g / cm 3 above.

2. The light-emitting display device according to claim 1, wherein: The light shielding layer is printed on a first surface of the fiber sheet located on a side of the light emitting surface.

3. The light-emitting display device according to claim 1, wherein: The fiber sheet with a light-shielding layer has a napped surface in which fibers of a surface layer are napped on a second surface of the fiber sheet that is not located on the light-emitting surface side.

4. The light-emitting display device according to claim 2, wherein: The fiber sheet with a light-shielding layer has a napped surface in which fibers of a surface layer are napped on a second surface of the fiber sheet that is not located on the light-emitting surface side.

5. The light-emitting display device according to claim 1, wherein: The light shielding layer is printed on a second surface of the fiber sheet that is not located on the side of the light emitting surface.

6. The light-emitting display device according to claim 1, wherein: The light shielding layer is printed on both a first surface of the fiber sheet located on the light emitting surface side and a second surface of the fiber sheet not located on the light emitting surface side.

7. The light-emitting display device according to any one of claims 1, 2, 5 or 6, wherein: The fiber sheet with a light-shielding layer further includes a light-transmitting surface resin layer on a second surface of the fiber sheet that is not located on the light-emitting surface side.

8. The light emitting display device according to any one of claims 1 to 6, wherein: The fiber sheet includes a nonwoven fabric of ultrafine fibers having a fineness of 1 dtex or less and a polymer elastic body impregnated into the nonwoven fabric in an amount of 3 to 40% by mass.

9. The light-emitting display device according to claim 7, wherein: The fiber sheet includes a nonwoven fabric of ultrafine fibers having a fineness of 1 dtex or less and a polymer elastic body impregnated into the nonwoven fabric in an amount of 3 to 40% by mass. 10 . The light-emitting display device according to claim 1 , comprising a light-transmitting portion having an average light transmittance of 5% to 15% in a visible light wavelength range of 380 to 780 nm. 11 . The light-emitting display device according to claim 7 , comprising a light-transmitting portion having an average light transmittance of 5% to 15% in a visible light wavelength range of 380 to 780 nm. 12 . The light-emitting display device according to claim 8 , comprising a light-transmitting portion having an average light transmittance of 5% to 15% in a visible light wavelength range of 380 to 780 nm. 13 . The light-emitting display device according to claim 9 , comprising a light-transmitting portion having an average light transmittance of 5% to 15% in a visible light wavelength range of 380 to 780 nm.

14. A fiber sheet with a light-shielding layer, which is used in a light-emitting display device that covers a light-emitting surface of a light-emitting component and selectively transmits the light of the light-emitting component to display a mark, pattern, or image by light emission. It contains: A fiber sheet having a first surface located on the light emitting surface side and a second surface located on the outer surface side, and a light shielding layer partially printed on at least one of the first surface and the second surface, The surface of the fiber sheet on which the light shielding layer is formed has an arithmetic mean height Sa of 3 to 20 μm based on ISO 25178 and an apparent density of 0.5 g / cm 3 above.

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