TW201814007A - Light diffusing and transmitting sheet capable of providing higher brightness with less power consumption - Google Patents

Abstract

The light diffusing and transmitting sheet (1) of the present invention includes a base resin (10) and composite particles (20) dispersed in the base resin (10). The composite particles (20) include a resin binder (21) and fine particles (22) encapsulated in the resin binder (21). The fine particles (22) include glass fine particles (22a).

Description

   Light diffusion transmission sheet   

The present invention relates to a light diffusion and transmission sheet.

Along with the improvement of the image quality of the liquid crystal display, in order to spatially homogenize the light emitted from the backlight device of the liquid crystal display, the demand for a light diffusion transmission sheet with high light diffusion characteristics is increasing. In addition, from the viewpoint of reducing energy consumption, the demand for a light-diffusing transmissive sheet with high brightness characteristics is also increasing.

Patent Document 1 describes a light-diffusing transmission sheet including a resin as a base material and silica composite particles dispersed in the resin. The silicon oxide composite particles contain titanium oxide fine particles having an average particle diameter of 100 nm or less. The light-diffusion transmissive sheet described in Patent Document 1 shows high total light transmittance and haze. Titanium oxide has a relatively high refractive index (for example, about 2.60).

Patent Document 2 describes an optical laminate having an internal scattering layer provided on a light-transmitting substrate. The internal scattering layer contains internal scattering particles. The average particle diameter of the internal scattering particles is 1 to 10 μm, and microparticles composed of an organic material and / or an inorganic material having an average particle diameter of 5 to 300 nm are included. Examples of the inorganic material forming the fine particles include materials having high refractive index expression properties such as titanium oxide, zinc oxide, zirconia, and aluminum oxide.

Patent Document 3 describes a transmissive screen for viewing an image projected from a projector. The transmissive screen has a light diffusing layer containing light diffusing fine particles and a xerogel. The light-diffusing fine particles are carried by a xerogel. Thereby, the xerogel voids (air having a refractive index of 1.0) exist on the surface of the light diffusing fine particles, and the relative refractive index of the light diffusing fine particles with respect to the air becomes extremely high. Therefore, effective light diffusion of the light-diffusing fine particles can be achieved. As a result, there is provided a transmissive screen that can visually recognize an image projected from a projector with a very wide viewing angle and excellent visibility from both sides of the screen. Patent Document 3 describes that as the light-diffusing fine particles, composite particles formed of organic fine particles and a small amount of inorganic fine particles (a ratio of inorganic fine particles of less than 50% by mass) may be used, or inorganic fine particles and a small amount Composite particles made of organic polymers (the ratio of organic fine particles is less than 50% by mass). For example, in the examples, optobeads 500S and optobeads 6500M, which are composite fine particles of silica and melamine resin, are used as light-diffusing fine particles.

Patent Document 4 describes a light diffusing plate including a light diffusing layer composed of a transparent substrate including a transparent resin. The light diffusion layer contains first light diffusion particles and second light diffusion particles existing inside the transparent substrate. The refractive index of the second light diffusion particles is greater than the refractive index of the first light diffusion particles. The refractive index of the first light diffusion particle is 1.4 to 1.7, and the refractive index of the second light diffusion particle is greater than 2.

Patent Document 1: Japanese Patent Application Laid-Open No. 2014-48427

Patent Document 2: Japanese Patent Application Laid-Open No. 2009-42554

Patent Document 3: Japanese Patent Application Publication No. 2013-195548

Patent Document 4: Japanese Patent Application Laid-Open No. 2008-40479

According to the technique described in Patent Document 1, there is room for improving the brightness characteristics of the light diffusion transmission sheet. Further, according to Patent Document 2, although specific materials such as titanium oxide are exemplified as inorganic materials forming fine particles, internal scattering particles which are effective for ensuring good light diffusion characteristics and improving the brightness of the optical laminate are not specifically studied. . According to Patent Document 3, only the optbeads 500S and optbeads 6500M are described as light-diffusing fine particles of composite particles. In addition, it is suggested that even if optbeads 500S is used, the brightness characteristics of the light diffusion layer are low due to the porosity of the light diffusion layer. Further, in Patent Document 4, there is no description or suggestion of dispersing composite particles in a transparent substrate.

Based on this situation, an object of the present invention is to provide a light-diffusing transmissive sheet having novel composite particles that are advantageous for achieving good light-diffusion characteristics and high-brightness characteristics.

The present invention provides a light-diffusing transmission sheet including: a base material resin; and composite particles containing a resin binder and fine particles contained in the resin binder, and the composite particles are dispersed in the base material resin; and the fine particles. Contains glass particles.

Since the microparticles contained in the resin adhesive contain glass microparticles, the composite particles are advantageous for achieving good light diffusion characteristics and high brightness characteristics. The above-mentioned light-diffusion and transmission sheet has good light-diffusion characteristics and high-brightness characteristics by including such composite particles.

1‧‧‧light diffusion transmission sheet

10‧‧‧Base resin

20‧‧‧ composite particles

21‧‧‧resin adhesive

22‧‧‧ fine particles

22a‧‧‧ glass particles

FIG. 1 is a schematic cross-sectional view of a light diffusion transmission sheet according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing the structure of a composite particle.

FIG. 3A is a light path diagram schematically showing the light of glass fine particles incident into the inside of composite particles.

FIG. 3B is a light path diagram schematically showing the light of the high-refractive index particles incident into the inside of the composite particle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description relates to an example of the present invention, and the present invention is not limited to these.

As shown in FIG. 1, the light diffusion and transmission sheet 1 of the present invention includes a base material resin 10 and composite particles 20. The composite particles 20 are dispersed in the base material resin 10. The base material resin 10 is not particularly limited, but is preferably a resin having excellent dispersibility of the composite particles 20 and having transparency to visible light, weather resistance, moisture resistance, and heat resistance. For example, as the base material resin 10, polyester polyol, linear polyester, acrylic resin, amine resin, epoxy resin, melamine resin, polysiloxane resin, urethane resin, Materials such as vinyl acetate resin, norbornene resin, and polycarbonate resin. Various thermosetting resins and various ultraviolet curing resins can also be used. To these resins, a hardening agent such as an isocyanate and various dispersants may be appropriately added. The light diffusion transmission sheet 1 may further include a substrate (not shown) such as a PET (polyethylene terephthalate) film, and the base material resin 10 in which the composite particles 20 are dispersed is formed in a layered manner on the substrate.

As shown in FIG. 2, the composite particles 20 include a resin binder 21 and fine particles 22. The fine particles 22 are enclosed in a resin adhesive 21. The fine particles 22 include glass fine particles 22a.

As shown in FIG. 3B, when high-refractive index particles PH having a higher refractive index than glass particles 22a like titanium dioxide particles exist in the interior of the composite particles instead of glass particles 22a, if light is incident on the high-refractive index particles PH, Then, most of the light may be repeatedly totally reflected inside the high-refractive-index particles PH and may be enclosed in the high-refractive-index particles PH. This situation is disadvantageous in terms of improving the brightness characteristics of the light diffusion and transmission sheet. On the other hand, as shown in FIG. 3A, if the glass fine particles 22a are contained inside the composite particles 20, there is a possibility that a part of the light is enclosed inside the glass fine particles 22a, but the refractive index of the glass is not so high. Therefore, most of the light passes through the glass fine particles 22a while properly refracting them on the surface of the glass fine particles 22a. That is, since the microparticles 22 of the composite particles 20 include glass microparticles 22a, most of the light incident on the glass microparticles 22a advances in front of the light diffusion transmission sheet 1, so the ratio of the light enclosed in the microparticles 22 decreases. As a result, the light diffusion and transmission sheet 1 has high brightness characteristics. In addition, from the viewpoint of bringing good light diffusion characteristics to the light diffusion and transmission sheet 1, glass tends to have a refractive index having an ideal relationship with the refractive index of the resin adhesive 21. Therefore, the case where the fine particles 22 include the glass fine particles 22a is advantageous for achieving both the good light diffusion characteristics and the high brightness characteristics. Accordingly, the light diffusion transmission sheet 1 has good light diffusion characteristics and high brightness characteristics.

In order to enable the composite particles 20 to be uniformly dispersed in the base material resin 10, it is preferable that the average particle diameter of the composite particles 20 is controlled to a specific range. From such a viewpoint, the average particle diameter of the composite particles 20 is, for example, 1 μm to 20 μm, more preferably 1 μm to 15 μm, and even more preferably 4 μm to 15 μm. Thereby, it is possible to prevent the spatial unevenness of the optical characteristics in the light diffusion transmission sheet 1. In addition, it is possible to reduce the light reflection loss caused by the light entering the space between the primary particles generated when the composite particles 20 are aggregated. Thereby, the brightness characteristic of the light-diffusion transmission sheet 1 can be improved. Furthermore, in the light-diffusion transmissive sheet 1, an interface where light is refracted can be sufficiently secured. Thereby, the light-diffusion characteristic of the light-diffusion transmission sheet 1 can be improved. In addition, the "average particle diameter" in this specification means the D50 of the volume basis measured by the laser diffraction method. In addition, the "average particle diameter" may be 50 or more that can be visually recognized when a cross section of the light diffusion transmission sheet 1 or a cross section of the composite particle 20 is observed with a scanning electron microscope (SEM) or a transmission electron microscope (TEM). The average value of the maximum diameter of the particles was obtained.

From the viewpoint of imparting spatially uniform light diffusion characteristics to the light diffusion and transmission sheet 1, the shape of the composite particles 20 is preferably a granular shape having an aspect ratio of 1 to 2. Here, the aspect ratio refers to a ratio (da / db) of the major axis da of the composite particles 20 to the minor axis db of the composite particles 20.

The average particle diameter of the glass fine particles 22a is, for example, 10 nm to 10 μm. The average particle diameter of the glass fine particles 22a is preferably 100 nm to 10 μm, and more preferably 100 nm to 5 μm. As a result, the glass fine particles 22 a are appropriately contained in the resin adhesive 21.

The refractive index of the glass fine particles 22a is, for example, 1.52 to 1.80. Thereby, the light diffusion transmission sheet 1 more surely has good light diffusion characteristics and high brightness characteristics. From the viewpoint that the light diffusion and transmission sheet 1 more surely has good light diffusion characteristics and high brightness characteristics, the refractive index of the glass fine particles 22a is preferably 1.54 to 1.80, and more preferably 1.55 to 1.80.

For example, the glass fine particles 22 a have a refractive index larger than that of the resin adhesive 21. The difference between the refractive index of the glass fine particles 22a and the refractive index of the resin adhesive 21 is, for example, 0.30 or less. This makes it difficult for the light incident on the glass microparticles 22a to be repeatedly totally reflected and sealed in the glass microparticles 22a, and the light diffusion transmission sheet 1 does have high brightness characteristics. The difference between the refractive index of the glass fine particles 22a and the refractive index of the resin adhesive 21 is, for example, 0.02 or more. Thereby, the light-diffusion transmissive sheet 1 more surely has good light-diffusion characteristics.

Although the glass which forms the glass microparticle 22a is not specifically limited, For example, it is the following glass.

A glass, expressed in mass%, containing the following components: 59% ≦ SiO ₂ ≦ 65%, 8% ≦ Al ₂ O ₃ ≦ 15%, 47% ≦ (SiO ₂ -Al ₂ O ₃ ) ≦ 57%, 1% ≦ MgO ≦ 5%, 20% ≦ CaO ≦ 30%, 0% <(Li ₂ O + Na ₂ O + K ₂ O) <2%, 0% ≦ TiO ₂ ≦ 5%, and does not substantially contain B ₂ O ₃ , F, ZnO, BaO, SrO, and ZrO ₂ glass. Here, the term "substantially free" means that it is not intentionally included except for the case where industrial raw materials are inevitably mixed in. Specifically, the content of the target component is less than 0.1% by mass, and is preferably less than 0.05% by mass, and more preferably less than 0.03% by mass. As such a glass, the glass described in International Publication No. 2006/068255 is exemplified. Thereby, the light diffusion transmission sheet 1 more surely has good light diffusion characteristics and high brightness characteristics.

The content rate of the composite particles 20 in the light diffusion transmission sheet 1 is, for example, 55% by mass or more, more preferably 60% by mass or more, and even more preferably 64% by mass or more. Thereby, the light diffusion and transmission sheet 1 more surely has good light diffusion characteristics and higher brightness characteristics. The content of the composite particles 20 in the light diffusion and transmission sheet 1 is, for example, 70% by mass or less, more preferably 68% by mass or less, and even more preferably 66% by mass or less. Thereby, the composite particles 20 are appropriately dispersed in the base material resin 10, and for example, the composite particles 20 can be prevented from being exposed on the surface of the light diffusion and transmission sheet 1.

The content of the fine particles 22 in the composite particles 20 is, for example, 30% to 99% by mass, more preferably 30% to 95% by mass, and even more preferably 50% to 90% by mass. The content of the resin binder 21 in the composite particles 20 is, for example, 1% to 70% by mass, more preferably 5% to 70% by mass, and even more preferably 10% to 50% by mass. Thereby, the light diffusion transmission sheet 1 more surely has good light diffusion characteristics and high brightness characteristics.

As shown in FIG. 2, the fine particles 22 may contain fine particles other than the glass fine particles 22 a. For example, the fine particles 22 further contain at least one selected from the group consisting of silica, polysiloxane, fluororesin, titanium dioxide, zinc oxide, zirconia, calcium carbonate, barium sulfate, zinc sulfide, aluminum hydroxide, and constitution pigments. Kind of particles. Thereby, the light-diffusion transmissive sheet 1 having various optical characteristics can be provided. Moreover, a specific mechanical strength can be given to the composite particle 20 as needed.

The composite particles 20 include, for example, glass fine particles 22a and silicon oxide fine particles. Thereby, the light diffusion transmission sheet 1 more surely has good light diffusion characteristics and high brightness characteristics. In this case, the average particle diameter of the silicon oxide fine particles is, for example, smaller than the average particle diameter of the glass fine particles 22a, and is, for example, 1 nm to 1 μm, more preferably 2 nm to 600 nm, and even more preferably 2 nm to 400 nm. The content of the silicon oxide fine particles in the composite particles 20 is, for example, 10% to 98% by mass, more preferably 15% to 94% by mass, and even more preferably 40% to 87% by mass. As a result, the silica particles can easily surround the glass particles 22a together with the resin adhesive 21, so the composite particles 20 have a relatively good mechanical strength. The silicon oxide fine particles have a spherical shape, for example. The composite particles 20 may contain only glass fine particles 22a and silica fine particles as the fine particles 22.

The resin adhesive 21 can contain fine particles 22 and has transparency to visible light. From the viewpoint of reducing the hardness of the composite particles 20 and reducing the possibility of damaging the member that is in contact with the light diffusion transmission sheet 1, the resin adhesive 21 is preferably selected from the group consisting of acrylic resin, polyurethane resin and nylon At least one resin in the group. Among them, the resin adhesive 21 is preferably a polyurethane resin.

Next, an example of the manufacturing method of the light-diffusion transmission sheet 1 is demonstrated. A raw material in which the resin binder 21 is dispersed, and a sol liquid containing the fine particles 22 containing at least glass fine particles 22a are prepared. If necessary, fine particles 22 (for example, silicon oxide fine particles), fluorescent dyes, fluorescent brighteners, dyes, or pigments different from the glass fine particles 22a are dispersed in the sol solution. The composite particles 20 can be obtained by spray-drying using the prepared sol solution. By adjusting the solid content in the sol solution and the spraying conditions in spray drying, aggregation of the primary particles can be suppressed, and the particle diameter of the composite particles 20 can be controlled within an appropriate range.

In addition, to the molten resin serving as the resin binder 21, microparticles 22 containing at least glass microparticles 22a are added, and microparticles 22 (for example, silicon oxide microparticles) different from glass microparticles 22a are added as needed, fluorescent dyes, fluorescent whitening agents, Dyes or pigments are kneaded together so that these additives are uniformly mixed with the molten resin. The composite particles 20 can also be obtained by pulverizing and adjusting the pieces of the resin thus obtained to a specific particle diameter. However, from the viewpoint of uniformly dispersing the fine particles 22 and the like in the resin adhesive 21 or efficiently producing the composite particles 20 having a preferable particle size and shape, it is more desirable to prepare the sol solution by spray drying Manufacture composite particle 20.

The composite particles 20 prepared as described above are uniformly dispersed in a fluid containing a raw material of the base resin 10. In this way, an ink containing the raw material of the base material resin 10 and the composite particles 20 is prepared. By applying this ink to a substrate such as a PET film and curing the ink, the light-diffusing transmission sheet 1 can be obtained.

Examples

The present invention will be described in detail using examples. However, the present invention is not limited to the following examples.

<Example>

An aqueous dispersion of glass fine particles (refractive index of glass: 1.57, average particle size of glass fine particles: 1.5 μm, concentration of glass fine particles: 5.8% by mass), 22.6 parts by weight of colloidal liquid A of silicon oxide fine particles (Nissan Chemical Industries, Ltd.) Manufactured, average particle diameter of silica fine particles: 2nm ~ 3nm, refractive index of silica fine particles: about 1.45, trade name: Snowtex XS), 18.4 parts by weight, colloidal liquid B of silica fine particles (manufactured by Japan Chemical Industry Co., Ltd., silica) Average particle size of microparticles: 7nm ~ 10nm, refractive index of silicon oxide microparticles: about 1.45, trade name: Silicadole 30S) 57.6 parts by weight, polyurethane emulsion A (manufactured by Mitsui Chemicals, trade name: Takelac W-6020, refraction of polyurethane Rate: 1.50 ~ 1.55) 17.7 parts by weight of polyurethane emulsion B (manufactured by Mitsui Chemicals, trade name: Takelac WS-6021, refractive index of polyurethane: 1.50 ~ 1.55) were mixed with 2.7 parts by weight to prepare a sol solution. The content of the glass fine particles in the solid content of the sol is 5.8% by mass, the content of the polyurethane solid content in the solid content of the sol is 20.4% by mass, and the silica particles in the solid content of the sol are Its content is 73.8% by mass.

The glass forming the glass particles is as follows: it is expressed in mass% and contains the following components, namely, 59% ≦ SiO ₂ ≦ 65%, 8% ≦ Al ₂ O ₃ ≦ 15%, 47% ≦ (SiO ₂ -Al ₂ O ₃ ) ≦ 57%, 1% ≦ MgO ≦ 5%, 20% ≦ CaO ≦ 30%, 0% <(Li ₂ O + Na ₂ O + K ₂ O) <2%, 0% ≦ TiO ₂ ≦ 5 % And contains substantially no B ₂ O ₃ , F, ZnO, BaO, SrO, and ZrO ₂ .

The sol solution prepared as described above was spray-dried using a micro-mist spray dryer (manufactured by Fujisaki Electric Corporation, product name: MDL-050) to produce the composite particles of the examples. The average particle diameter of the composite particles in the examples is 4 to 15 μm. The average particle diameter of the composite particles was measured using a laser diffraction scattering particle size distribution measuring device (manufactured by Nikkiso Co., Ltd., product name: Microtrac MT-3000II). The sample used in this measurement was prepared by mixing an appropriate amount of the dried composite particles with pure water and applying ultrasonic vibration (130 W for 1 minute) to disperse the composite particles in pure water.

The composite particles of the examples produced as described above were dispersed in an acrylic resin to prepare an ink. This ink was applied to a PET film having a thickness of 20 μm by a doctor blade method and cured to prepare samples of the examples. The thickness of the coating film in the sample of the example was 7 to 15 μm, and the content of the composite particles in the coating film of the sample of the example was 65% by mass.

<Comparative example>

8.4 parts by weight of an aqueous dispersion of titanium dioxide fine particles (refractive index: 2.71, average particle diameter of titanium dioxide fine particles: 330 nm, concentration of titanium dioxide fine particles: 20% by mass), and an aqueous dispersion of zinc oxide fine particles (refractive index: 2.0, zinc oxide) Average particle size of fine particles: 0.15 to 0.16 μm, concentration of zinc oxide fine particles: 21.7% by mass) 9.1 parts by weight, colloidal liquid A of silicon oxide fine particles (manufactured by Nissan Chemical Industries, Ltd .; average particle size of silicon oxide fine particles: 2nm to 3nm) Refractive index of silicon oxide fine particles: about 1.45, trade name: Snowtex XS) 16.6 parts by weight, colloidal liquid B of silicon oxide fine particles (manufactured by Nippon Chemical Industry Co., Ltd., average particle diameter of silicon oxide fine particles: 7nm ~ 10nm, silicon oxide fine particles Refractive index: about 1.45, trade name: Silicadole 30S) 44.3 parts by weight, polyurethane emulsion A (manufactured by Mitsui Chemicals, trade name: Takelac W-6020, refractive index of polyurethane: 1.50 ~ 1.55), 19.4 parts by weight, polyurethane emulsion B (Mitsui Chemical Co., Ltd., trade name: Takelac WS-6021, refractive index of polyurethane: 1.50 to 1.55) 2.2 parts by weight were mixed to prepare a sol solution. The content of titanium dioxide microparticles in the solid content of the sol solution is 6.3% by mass, the content of zinc oxide microparticles in the solid content of the sol solution is 7.4% by mass, and the content of silicon oxide microparticles in the solid content of the sol solution is The content was 62.1% by mass, and the content of the solid content of the polyurethane in the solid content of the sol was 24.2% by mass.

The sol solution prepared as described above was spray-dried using a micro-mist spray dryer (manufactured by Fujisaki Electric Corporation, product name: MDL-050) to prepare composite particles of a comparative example. The average particle diameter of the composite particles of the comparative example was 4 to 15 μm. The average particle diameter of the composite particles in the comparative example was measured in the same manner as in the example.

The composite particles of the comparative example were dispersed in an acrylic resin to prepare an ink. This ink was applied to a PET film having a thickness of 20 μm by a doctor blade method and cured to prepare a sample of a comparative example. The thickness of the coating film in the sample of the comparative example was 7 to 15 μm, and the content of the composite particles in the coating film of the sample of the comparative example was 65% by mass.

<Measurement of brightness characteristics>

The brightness and chromaticity y of the samples of the examples and the samples of the comparative examples were measured using a brightness measuring device (manufactured by Hi-land, product name: RISA-COLOR ONE). As a light source, a backlight device of the iPhone 5 manufactured by Apple was used. Furthermore, "iPhone" is a registered trademark of Apple Inc. The measurement position of brightness and chromaticity y is located on the opposite side of the light source of the sample, and the distance between the measurement position of brightness and chromaticity y and the sample is 100 cm. The results are shown in Table 1. When the relative value of the brightness is 100%, the value of the brightness is 10 ⁴ cd / cm ² .

<Measurement of atomization rate>

Using a spectrophotometer (manufactured by Shimadzu Corporation, product name: UV-3600) and an integrating sphere, the haze ratio of the sample of the example and the sample of the comparative example to incident light with a wavelength of 555 nm was measured. The results are shown in Table 1.

As shown in Table 1, it is suggested that the samples of Examples have higher brightness characteristics than the samples of Comparative Examples. In addition, it is suggested that the samples of the examples have a higher atomization rate than the samples of the comparative examples, and have good light diffusion characteristics.

Claims (9)

    A light diffusion and transmission sheet comprising: a base material resin; and composite particles containing a resin binder and fine particles enclosed in the resin binder, the composite particles are dispersed in the base material resin, and the fine particles include glass fine particles.         For example, the light-diffusion and transmissive sheet according to item 1 of the patent application range, wherein the average particle diameter of the composite particles is 1 μm to 20 μm.         For example, the light-diffusion and transmissive sheet according to item 1 or 2 of the patent application range, wherein the average particle diameter of the glass fine particles is 10 nm to 10 μm.         For example, the light-diffusing and transmissive sheet according to any one of claims 1 to 3, wherein the refractive index of the glass fine particles is 1.52 to 1.80.         For example, the light-diffusion and transmissive sheet according to any one of claims 1 to 4, wherein the difference between the refractive index of the glass fine particles and the refractive index of the resin adhesive is 0.30 or less.         For example, the light-diffusion and transmissive sheet according to any one of claims 1 to 5, wherein the content of the fine particles in the composite particles is 30% to 99% by mass, and the content of the resin binder in the composite particles is The content rate is 1 to 70% by mass.         For example, the light-diffusing and transmissive sheet according to any one of claims 1 to 6, wherein the fine particles further contain a material selected from the group consisting of silica, magnesium fluoride, polysiloxane, fluororesin, titanium dioxide, zinc oxide, and At least one kind of fine particles in a group consisting of zirconium, calcium carbonate, barium sulfate, zinc sulfide, aluminum hydroxide, and an extender pigment.         For example, the light-diffusion and transmissive sheet according to any one of claims 1 to 7, wherein the composite particles contain glass fine particles and silicon oxide fine particles as the fine particles.         For example, the light-diffusion and transmissive sheet according to any one of claims 1 to 8, wherein the resin adhesive includes at least one resin selected from the group consisting of acrylic resin, polyurethane resin, and nylon.