JP2016212267A - Transmissive screen and manufacturing method of the same, and display system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmissive screen that can display images by projecting light, the transmissive screen having high transmissivity, and excellent in color reproducibility and long-term stability in a high-temperature and high-humidity environment.SOLUTION: There is provided a transmissive screen comprising at least two color material layers, where the at least two color material layers are made to include a color material that scatters light beams having different wavelengths from each other in a surface plasmon resonance mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmissive screen, a manufacturing method thereof, and a display system using the same.

  2. Description of the Related Art Conventionally, various screens have been used as projection surfaces for enlarged images for presentations such as exhibitions, academic conferences, and conferences using projectors (projection display devices), and for viewing videos in home theaters and the like.

  2. Description of the Related Art In recent years, it has been performed to display an image by projecting light onto a screen using a projector for various uses. Here, a transparent screen (transmission type screen) for making the background of the screen visible is also being developed, and it is expected to be applied to various uses in the future. is there.

  This transmissive screen has a configuration in which metal nanoparticles that scatter projected light are dispersed in a transparent resin as a color material. As such a technique, for example, Patent Document 1 discloses a high-refractive-index nanoparticle / nanocomposite in which high-refractive-index nanoparticles are dispersed in a dispersion medium, and a high-concentration material containing the same or similar material as the dispersion medium. A technique using a transparent light diffuser containing a high refractive index nanoparticle composite, characterized in that the average size of the refractive index nanoparticle composite is 40 to 4000 nm, as a transmissive screen is disclosed. Patent Document 2 discloses a technique relating to a transmission screen using core-shell structured nanoparticles as a coloring material.

JP 2014-153708 A US Patent Application Publication No. 2014/0185282

  However, according to the study of the present inventor, since the transmittance of the transmission screen described in Patent Document 1 is not sufficient, it is difficult to sufficiently recognize the background of the screen. It turned out that there was a problem that the use was limited. The present inventor has also found that there is room for improvement in terms of color reproducibility in the transmissive screen described in Patent Document 2. Furthermore, the transmissive screens described in any of the patent documents are not sufficiently stable for a long period of time, and there is a problem that the transmittance is lowered particularly when exposed to a high temperature and high humidity environment for a long period of time. It was.

  The present invention has been made in view of the above circumstances, and in a transmissive screen capable of displaying an image by projecting light, has high transparency, excellent color reproducibility, and long-term operation in a high-temperature and high-humidity environment. The object is to provide a product having excellent stability.

  The present inventor has intensively studied to solve the above problems. As a result, the above problem can be solved by forming a transmissive screen by laminating two or more color material layers containing color materials that respectively surface plasmon resonance scatter light of different wavelengths. The headline and the present invention have been completed.

  That is, according to one aspect of the present invention, the transmissive screen has at least two color material layers, and the at least two color material layers each color-diffuse light having different wavelengths to surface plasmon resonance scattering. A transmissive screen is provided.

  According to the present invention, a transmissive screen capable of displaying an image by projecting light has high transparency, excellent color reproducibility, and excellent long-term stability in a high temperature and high humidity environment. Is done.

It is a perspective view which shows the outline | summary of the projection system which concerns on one Embodiment of the display system provided by this invention. It is sectional drawing along the II-II line | wire shown in FIG.

  According to an aspect of the present invention, there is provided a transmissive screen having at least two color material layers, each of the at least two color material layers including a color material for surface plasmon resonance scattering of light having different wavelengths. A transmissive screen is provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited only to the following embodiment. In addition, the dimensional ratios in the drawings are exaggerated and may be different from the actual dimensional ratios. Further, in this specification, “X to Y” indicating a range means “X or more and Y or less”.

  FIG. 1 is a perspective view showing an outline of a projection system according to an embodiment of a display system provided by the present invention. 2 is a cross-sectional view taken along the line II-II shown in FIG.

  As shown in FIG. 1, the projection system 10 includes a projector 100 that is a light source and a transmissive screen 200. The transmissive screen 200 displays an image by scattering the projection light projected from the proximity projection type projector (projection type display device) 100 disposed obliquely below the front side of the front side. Presents a visual shape. Thus, the projection system 10 has a configuration in which the projector 100 is added to the transmissive screen 200.

  The transmissive screen 200 includes a base material 210, and the color material layer 220 is disposed on one surface of the base material 210 (the back surface on the light incident side from the projector 100). The color material layer 220 has a configuration in which three layers of a blue scattering layer 222, a green scattering layer 224, and a red scattering layer 226 are stacked from the light incident side of the projector 100. As shown in FIG. 2, the blue scattering layer 222 includes a blue scattering color material 222B dispersed in a binder resin (not shown). The green scattering layer 224 includes a green scattering color material 224G dispersed in a binder resin (not shown). Further, the red scattering layer 226 is formed by dispersing a red scattering color material 226R in a binder resin (not shown). In the embodiment shown in FIG. 2, the blue scattering color material 222B is a silver nanoparticle made of silver alone, and the green scattering color material 224G and the red scattering color material 226R are made of silver alone on the surface of a core made of silica particles. It is a core-shell metal nanoparticle formed by forming a shell. And these color materials have the maximum peak wavelength of surface plasmon resonance scattering intensity in the region where the blue scattering color material 222B is 420 to 500 nm (that is, blue light is surface plasmon resonance scattered), and the green scattering color material 224G has a maximum peak wavelength of surface plasmon resonance scattering intensity in the region of 500 to 600 nm (that is, surface light plasmon resonance scattering of green light), and red scattering colorant 226R has surface plasmon resonance scattering in the region of 600 to 720 nm. It has a maximum peak wavelength of intensity (ie, surface plasmon resonance scattering of red light). In order to exhibit such an optical function, the particle size of each color material is designed to satisfy the relationship of blue scattering color material 222B <green scattering color material 224G <red scattering color material 226R. Hereinafter, each component of the display system according to the present invention will be described in detail.

≪Light source≫
The light source projects projection light corresponding to an image to be displayed on the transmissive screen 200. As such a light source, a solid light emitting element such as an LED (Light Emitting Diode), a semiconductor laser, or the like can be used in addition to a lamp light source such as a projector.

≪Transparent type screen≫
The transmission screen has at least two color material layers. This color material layer is preferably disposed on a substrate as shown in FIG.

(Base material)
The base material is an optional component and is made of a material capable of supporting the color material layer. When a substrate is used, a transmission type screen is usually produced by forming a color material layer on the substrate. Examples of the constituent material of the substrate include a glass plate or a resin film. Examples of the resin film that can be used as the substrate include a transparent resin film. Examples of the transparent resin film include polyolefin films (polyethylene, polypropylene, etc.), polyester films (polyethylene terephthalate, polyethylene naphthalate, etc.), polyvinyl chloride films, cellulose ester films (triacetyl cellulose, etc.), preferably polyester films. is there. Although it does not specifically limit as a constituent material of a polyester film, It is preferable that it is polyester which has the film formation property which has a dicarboxylic acid component and a diol component as main structural components. The main constituent dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenylsulfone dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenylethanedicarboxylic acid, Examples thereof include cyclohexane dicarboxylic acid, diphenyl dicarboxylic acid, diphenyl thioether dicarboxylic acid, diphenyl ketone dicarboxylic acid, and phenylindane dicarboxylic acid. Examples of the diol component include ethylene glycol, propylene glycol, tetramethylene glycol, cyclohexanedimethanol, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyethoxyphenyl) propane, bis ( 4-hydroxyphenyl) sulfone, bisphenol fluorange hydroxyethyl ether, diethylene glycol, neopentyl glycol, hydroquinone, cyclohexanediol and the like. Among the polyesters having these as main components, from the viewpoint of transparency, mechanical strength, dimensional stability, etc., as dicarboxylic acid components, terephthalic acid and 2,6-naphthalenedicarboxylic acid, diol components as ethylene glycol and 1, Polyester having 4-cyclohexanedimethanol as a main constituent is preferred. Of these, polyesters mainly composed of polyethylene terephthalate and polyethylene naphthalate, copolymerized polyesters composed of terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, and mixtures of two or more of these polyesters are mainly used. Polyester as a constituent component is preferable. In addition, you may use the resin film which is not transparent as a base material. The thickness of the substrate is not particularly limited, but is usually 10 to 500 μm.

(Color material layer)
The transmission screen according to the present invention has at least two color material layers, and each color material layer is characterized in that it includes a color material that scatters light of different wavelengths by surface plasmon resonance. When the color material layer includes the color material, the transmission screen can scatter the projection light projected from a light source such as a projector and display an image.

  “Surface plasmon resonance scattering” is a natural frequency of surface electrons in which light enters a nano-sized particle and the frequency of the photon of the incident light periodically oscillates against the restoring force of the nucleus of the constituent atoms of the particle. This is a collective oscillation phenomenon of electrons in a solid or liquid that is induced when resonating with.

  As described above, when the color material layer includes the color material, the transmission screen scatters the projection light projected from a light source such as a projector and displays an image. From this, the color material layer usually scatters visible light. In other words, at least one of the color materials included in the color material layer emits light (visible light) having a wavelength of 380 to 740 nm on the surface. It is preferably one that scatters plasmon resonance. In a more preferred embodiment, it is preferable that the color material layer includes a total of three types of color materials that perform surface plasmon resonance scattering of the three primary colors of light (blue, green, and red). With such a configuration, a full-color image can be displayed on the transmissive screen. In such a configuration, each of the three kinds of color materials is preferably included in a different color material layer. In this case, the number of color material layers is three or more. The upper limit of the number of the color material layers is not particularly limited, but from the viewpoint of suppressing visibility and contrast deterioration due to light reflection at the interface between the color material layers, the color material layer. The number of layers is preferably 6 layers or less, and more preferably 3 layers or less. When a base material is used, the number of color material layers arranged on one surface of the base material is particularly preferably three layers. In this case, as shown in FIG. Most preferably, each of these is contained in a different color material layer. That is, in a preferred embodiment of the transmission screen according to the present invention, the color material layer includes a red scattering layer including a red scattering color material having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 600 to 720 nm, and 500 to Blue color including a green scattering layer including a green scattering color material having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 600 nm, and a blue scattering color material including a maximum peak wavelength of surface plasmon resonance scattering intensity to a region of 420 to 500 nm It has at least three layers with a scattering layer, and more preferably consists of these three layers.

-Coloring material There is no particular limitation on the specific configuration of the coloring material contained in the coloring material layer, and a configuration capable of causing the surface plasmon resonance scattering phenomenon as described above for light having a desired wavelength. What is necessary is just to have. The structure of such a color material itself is conventionally known, and known knowledge such as Chia Wei Hsu et al., Nature Communications, 5, Article number: 3152 can be appropriately referred to in addition to Patent Document 2.

  The constituent material of the color material is not particularly limited, but preferably includes metal nanoparticles. In other words, the color material layer preferably includes different metal nanoparticles as the color material. In the present invention, the “metal nanoparticle” refers to a particle containing a single metal and having a particle size of nanometer order. Although there is no restriction | limiting in particular as a metal simple substance contained in a metal nanoparticle, Preferably silver, gold | metal | money, or copper is mentioned, From a viewpoint that scattering can fully be produced with respect to the wide wavelength of visible light region, it is silver. Is particularly preferred.

The wavelength of light at which the color material causes surface plasmon resonance scattering depends mainly on the particle size of the color material (or the thickness of the shell layer when the color material is a core-shell particle and only the shell layer scatters). Determined. Therefore, the particle diameter of the color material such as metal nanoparticles may be determined according to which wavelength of light is scattered by each color material. In this case, the average particle size of the blue scattering colorant (R _B), average particle sizes of (R _G) and the red scatter colorant of the green scattering colorant (R _R) is, R B _<R it is preferably configured to satisfy the relation _{G <R R.} Specifically, for example, the average particle diameter of the blue scattering color material having the maximum peak wavelength of the surface plasmon resonance scattering intensity in the region of 420 to 500 nm is preferably 50 to 70 nm, more preferably 55 to 65 nm. . Moreover, the average particle diameter of the green scattering color material having the maximum peak wavelength of the surface plasmon resonance scattering intensity in the region of 500 to 600 nm is preferably 65 to 83 nm, and more preferably 70 to 80 nm. Furthermore, the average particle diameter of the red scattering colorant having the maximum peak wavelength of the surface plasmon resonance scattering intensity in the region of 600 to 720 nm is preferably 83 to 110 nm, more preferably 85 to 95 nm. In the present invention, the value of the “average particle diameter” of the colorant such as metal nanoparticles is a value measured by the method described in the column of Examples (measurement of particle size distribution by dynamic light scattering method) described later. Shall be adopted.

  When configuring the metal nanoparticles having the above-mentioned preferable average particle size, it is easy to configure the color material (metal nanoparticles) from a single metal for the blue scattering color material having a relatively small average particle size. That is, in a preferred embodiment of the present invention, the blue scattering color material is a nanoparticle made of a metal simple substance, and particularly preferably a nanoparticle made of a silver simple substance. On the other hand, for green and red scattering colorants having a relatively large average particle size, general visible light scattering increases and transparency cannot be maintained. It is difficult to construct a single unit. For this reason, it is preferable to use metal nanoparticles having a core-shell structure as the green scattering color material and the red scattering color material. Here, there is no particular limitation on the configuration of the metal nanoparticles having a core-shell structure, and conventionally known knowledge can be referred to as appropriate, but the metal nanoparticles such as a shell in the case where the metal nanoparticles have a core-shell structure. The constituent material of the surface is preferably composed of the above-described simple substance of silver, gold or copper, and more preferably composed of a simple substance of silver. In addition, the concept of “the constituent material of the surface of the metal nanoparticle” includes the metal simple substance in the case where the metal nanoparticle is made of the metal simple substance.

  Here, there is no restriction | limiting in particular about the manufacturing method of a metal nanoparticle, A conventionally well-known knowledge can be referred suitably. As a method for producing metal nanoparticles, there are a liquid phase method and a gas phase method. Examples of the liquid phase method include a precipitation method, a coprecipitation method, a sol-gel method, a uniform precipitation method, and a reduction method. In addition, reverse micelle method, supercritical hydrothermal synthesis method and the like are also excellent methods for producing metal nanoparticles (for example, JP 2002-322468, JP 2005-239775, JP 10-310770, JP (See Kai 2000-104058). In particular, when producing metal nanoparticles by a liquid phase method, a reduction method (that is, a production method having a step of reducing a precursor compound of the metal nanoparticles by a reduction reaction in a dispersion solvent) is particularly preferable. . In this reduction method, the reduction reaction of the precursor compound is preferably performed in the presence of a surfactant. On the other hand, the vapor phase method for producing metal nanoparticles includes an aerosol method in which high-pressure gas is injected to produce powder, and a thermal decomposition method in which powder is produced by pyrolysis using a metal compound and a gas reducing agent. The evaporation raw material can be divided into evaporation / condensation methods in which the raw material for evaporation is heated and evaporated to produce powder. In the present invention, a vapor phase method may be used as necessary.

  When the metal nanoparticles have a core-shell structure, for example, as a method for producing such metal nanoparticles, first of all, after preparing fine particles to be a core, in the presence of this core, the method described above is applied. A possible method (preferably a liquid phase method, more preferably a reduction method) is a method of forming a shell made of a metal on the surface of the core. Here, there is no restriction | limiting in particular in the form of microparticles | fine-particles used as a core, Inorganic particles, such as a metal oxide, can be used. In some cases, metal fine particles may be used as the core. Examples of such inorganic particles include hollow particles and solid particles. Preferably, solid particles are used. The inorganic particles forming the core are not particularly limited, and examples thereof include silica, tin oxide (including antimony-doped tin oxide), titanium oxide, zinc oxide, calcium carbonate, alumina, magnesium hydroxide, barium titanate. And silicon nitride.

  Further, as the inorganic particles, for example, the colloidal inorganic particles can be used, and examples of such colloidal inorganic particles include colloidal silica. Examples of colloidal silica include fine particles of silicon dioxide (anhydrous silicic acid), as described in, for example, JP-A Nos. 53-12732, 57-9051, and 57-51653. Examples thereof include colloids having an average particle size of 5 nm to 1 μm, preferably 10 to 100 nm.

  Colloidal silica may be produced by a conventionally known method, or is commercially available. Colloidal silica can be obtained by heating and aging a silica sol obtained by metathesis using an acid of sodium silicate or the like and passing through an ion exchange resin layer.

  The primary particle size and the shell thickness of such a core (inorganic particle) may be appropriately set in consideration of a desired value of the particle size of the finally obtained core-shell metal nanoparticles. When the color material is a metal nanoparticle having a core-shell structure, a surface plasmon resonance scattering phenomenon for displaying an image on a transmission screen occurs on the surface of the shell. It is preferable that the core has as little influence as possible on the color developed by this scattering phenomenon. From such a viewpoint, the core is preferably transparent, and specifically, the total line transmittance of the core is preferably 90% or more.

  In addition, although there is no restriction | limiting in particular about content of the color material in a color material layer, Preferably it is 10-60 mass% with respect to the total amount of 100 mass% of a color material layer, More preferably, it is 20-50 mass%. . When the content of the color material is 10% by mass or more, it is possible to scatter a sufficient amount of light. On the other hand, if the content of the color material is 60% by mass or less, a sufficiently large distance between the color materials is secured, and the scattering peak is broadened due to this distance being too close (resonance between the color materials). The shift of the color to the long wavelength side) and the resulting decrease in the contrast of the display image can be prevented.

-Binder resin As mentioned above, although a color material layer contains a color material, in order to disperse | distribute this color material in a color material layer, it is preferable that a color material layer contains binder resin. In the present invention, it is not necessary to use an organic solvent, and it is preferable from the viewpoint of environmental conservation. Therefore, the binder resin is preferably composed of a water-soluble polymer. However, the present invention is not limited to such a form, and an inorganic polymer, a resin such as a conventionally known acrylic resin or polyester resin, a cured resin composition mainly composed of a polyfunctional acrylic compound, or the like is used as a binder resin. May be.

  In the present invention, the “water-soluble polymer” means a G2 glass filter (maximum pores 40 to 50 μm) when dissolved in water at a concentration of 0.5 mass% at the temperature at which the water-soluble polymer is most dissolved. The mass of the insoluble matter that is filtered off when filtered through is within 50% by mass of the added water-soluble polymer. Among such water-soluble polymers, polyvinyl alcohols, gelatin, celluloses, thickening polysaccharides, and polymers having reactive functional groups are preferable, and polyvinyl alcohols are particularly preferable. These water-soluble polymers may be used alone or in combination of two or more. The water-soluble polymer may be a synthetic product or a commercial product.

  Hereinafter, these water-soluble polymers will be described.

  The polyvinyl alcohols used as the binder resin in the present invention include, in addition to ordinary polyvinyl alcohol obtained by hydrolysis of polyvinyl acetate, polyvinyl alcohol having a terminal cation modified, an anion modified polyvinyl alcohol having an anionic group, and the like. Modified polyvinyl alcohol is also included. Here, polyvinyl alcohol obtained by hydrolyzing vinyl acetate preferably has an average polymerization degree of 1000 or more, and particularly preferably has an average polymerization degree of 1500 to 10,000. The saponification degree is preferably 70 to 100%, particularly preferably 80 to 99.5%. The “degree of saponification” is the ratio of hydroxyl groups (hydroxy groups) to the total number of acetyloxy groups (derived from the starting vinyl acetate) and hydroxyl groups (hydroxy groups) in polyvinyl alcohols. Furthermore, 1000-200000 are preferable and, as for the weight average molecular weight of polyvinyl alcohol, 3000-40000 are more preferable. If the weight average molecular weight is 1000 or more, sufficient film formability can be obtained. On the other hand, if the weight average molecular weight is 200000 or less, problems such as an increase in viscosity are unlikely to occur. In addition, the value measured by HPLC method shall be employ | adopted as a value of the weight average molecular weight of polyvinyl alcohol.

  The transmission type screen according to the present invention has at least two colorant layers, and among these at least two colorant layers, adjacent colorant layers are bonded with polyvinyl alcohols having different saponification degrees. It is preferable to include as resin.

  Here, the polyvinyl alcohols for comparing the difference in the saponification degree in the adjacent color material layers are those in the case where each color material layer includes a plurality of polyvinyl alcohols (different in saponification degree and polymerization degree). And polyvinyl alcohols with the highest content. Here, when the term “polyvinyl alcohol having the highest content in the colorant layer” is used, it is assumed that polyvinyl alcohols having a difference in saponification degree of 3 mol% or less are the same polyvinyl alcohol, and the degree of polymerization is calculated. To do. However, low-polymerization degree polyvinyl alcohols having a polymerization degree of 1000 or less are different polyvinyl alcohols (even if polyvinyl alcohols having a saponification degree difference of 3 mol% or less exist, they are not regarded as the same polyvinyl alcohols). Specifically, polyvinyl alcohols having a saponification degree of 90 mol%, a saponification degree of 91 mol%, and a saponification degree of 93 mol% are contained in the same colorant layer by 10 mass%, 40 mass%, and 50 mass%, respectively. In some cases, these three polyvinyl alcohols are the same polyvinyl alcohol. Further, the above-mentioned “polyvinyl alcohol having a difference in saponification degree of 3 mol% or less” is sufficient if it is within 3 mol% when attention is paid to any polyvinyl alcohol, for example, 90, 91, 92, 94 When mol% polyvinyl alcohol is included, when paying attention to 91 mol% polyvinyl alcohol, since all the polyvinyl alcohols are within 3 mol%, the same polyvinyl alcohol is obtained.

  Here, in the case where a plurality of polyvinyl alcohols having the highest content are present in the same content, any combination of the polyvinyl alcohols only needs to satisfy the above-mentioned regulations, and all The combination does not have to satisfy the above definition.

  On the other hand, examples of water-soluble polymers other than polyvinyl alcohols that can be used as a binder resin in the present invention include gelatin, polyethylene oxide, polyvinyl pyrrolidone, polyacrylic acid, polyacrylamide, polyurethane, dextran, dextrin, carrageenan (κ, ι, λ, etc.), agar, pullulan, water-soluble polyvinyl butyral, hydroxyethyl cellulose, carboxymethyl cellulose and the like.

  In addition, although there is no restriction | limiting in particular about content of the binder resin in a color material layer, Preferably it is 40-90 mass% with respect to the total amount of 100 mass% of a color material layer, More preferably, it is 50-80 mass%. . If the content of the binder resin is 40% by mass or more, a sufficiently large distance between the color materials is ensured, and the scattering peak is broadened (resonance between the color materials) due to this distance being too close. This can prevent a decrease in contrast of the display image. On the other hand, if the content of the binder resin is 90% by mass or less, a sufficient amount of coloring material can be contained, and a sufficient amount of light can be scattered.

  As described above, the color material (metal nanoparticles) and the binder resin have been described as the components of the color material layer. However, the color material layer may further include other components as long as the effect of the present invention is not adversely affected. Examples of other components that can be included in the color material layer include single metal particles, metal oxide particles, and organic pigment fine particles. In addition, content of these other components in a color material layer becomes like this. Preferably it is 0-5 mass%, More preferably, it is 0-3 mass%, More preferably, it is 0-1 mass%.

  The thickness of each color material layer is not particularly limited. For example, when three types of scattering color materials are used, if the color material layer is a single layer, all the scattered color materials having different particle diameters are uniformly distributed. It is difficult to disperse in a color material layer composed of In particular, when a color material layer is formed by application of a coating liquid containing a color material and a binder resin as will be described later, since the drying occurs gradually from the portion in contact with air in the drying process of the coating film, The material tends to be unevenly distributed in the non-dry portion. As a result, when the thickness of the color material layer is increased, there is a problem that the transparency of the screen is lowered or the color reproducibility is deteriorated. Thus, when the color material layer is a single layer, there is a limit to increasing the thickness, and there is a problem that a transmission type screen cannot be formed using a sufficient amount of the scattering color material. On the other hand, two or more (preferably three or more) color material layers are provided as in the present invention, and each scattering color material is allocated and added to each color material layer. The deterioration of dispersibility in the case of only the layer can be prevented. For this reason, it is possible to increase the thickness of each color material layer. As a result, a sufficient amount of scattering color material can be added to each color material layer, and there is an advantage that sufficient scattering intensity can be obtained. From such a viewpoint, the thickness of each color material layer is preferably 100 to 3000 μm, and more preferably 500 to 2000 μm.

  There are no particular restrictions on the arrangement of the color material layers, and the color material layers of two or more layers (preferably three or more layers) can be arranged in any order. For example, when the transmissive screen according to the present invention has a base material, each of the color material layers of two or more layers (preferably three or more layers) may be disposed only on one surface of the base material, or both of the base materials It may be arranged on the surface. Here, in a preferred embodiment in which each color material layer is disposed only on one surface of the substrate, as shown in FIGS. 1 and 2, a red scattering layer, a green scattering layer, a blue scattering layer, Are preferably arranged in this order. In this case, it is more preferable that the display system is configured such that the projection light from the light source is projected from the blue scattering layer side. Here, the red scattering color material contained in the red scattering layer slightly scatters light having a wavelength corresponding to blue, but the above configuration results in scattering of blue wavelength light by the red scattering color material. Therefore, it is possible to prevent a decrease in contrast of the displayed image. On the other hand, when each color material layer is disposed on both surfaces of the substrate, the total number of color material layers disposed on both surfaces of the substrate may be two or more, and three or more layers. Preferably there is. For the same reason as described above, the blue scattering color material and the red scattering color material are preferably contained in different color material layers.

  There are no particular limitations on the method of forming each color material layer, and any method such as a sequential coating method or a simultaneous multilayer coating method can be used as long as it is a method capable of forming at least two color material layers. For example, in the case of using a base material, a coating can be formed by coating each color material layer coating solution for forming each color material layer simultaneously on one or both surfaces of the base material, followed by drying. It is preferable to laminate each color material layer coating solution by an aqueous simultaneous multilayer coating method. On the other hand, when not using a base material, a laminated body can be similarly formed in one surface of a process film (film peeled and removed after formation of a laminated body). That is, according to another aspect of the present invention, there is provided a method for manufacturing a transmission screen according to the present invention, wherein at least a coating liquid containing a coloring material is applied on the surface of a base material or a process film by simultaneous multilayer coating. A manufacturing method including a step of forming two colorant layers is provided.

  Examples of the coating method include a roll coating method, a rod bar coating method, an air knife coating method, a spray coating method, a curtain coating method, or US Pat. Nos. 2,761,419 and 2,761,791. A slide bead coating method using an hopper, an extrusion coating method, or the like is preferably used. Among these, it is particularly preferable to use the slide bead coating method in order to perform the aqueous simultaneous multilayer coating.

  The solvent for preparing the coating material for the color material layer is not particularly limited, but an aqueous solvent (aqueous medium) is preferable, and water is more preferable. In the present invention, an aqueous solvent is preferably used in order to mainly use a water-soluble polymer, preferably polyvinyl alcohol, as the resin binder. Compared to the case where an organic solvent is used, the aqueous solvent does not require a large-scale production facility, so that it is preferable in terms of productivity and also in terms of environmental conservation. However, a small amount of an organic solvent such as an alcohol solvent may be added to the aqueous solvent. When using a mixed solvent of water and a small amount of an organic solvent, the content of water in the mixed solvent is preferably 80 to 99.9% by mass, based on 100% by mass of the entire mixed solvent, and 90 to 99%. More preferably, it is 5 mass%.

  The method for preparing the coating liquid for the color material layer is not particularly limited. For example, a color material (such as metal nanoparticles that are each scattered color material), a water-soluble polymer, and other components that are added as necessary are added. And a method of stirring and mixing. At this time, the order of addition of the respective components is not particularly limited, and the respective components may be sequentially added and mixed while stirring, or may be added and mixed at one time while stirring. The density | concentration of each component in a coating liquid is prepared so that each component may become above-mentioned desired content rate after drying of a coating film.

  When the slide bead coating method is used, the temperature of each color material layer coating solution for simultaneous multilayer coating is preferably 25 to 60 ° C, more preferably 30 to 45 ° C. Moreover, when using a curtain application | coating system, the temperature range of 25-60 degreeC is preferable, and the temperature range of 30-45 degreeC is more preferable.

  The viscosity of each color material layer coating solution when performing simultaneous multilayer coating is not particularly limited. However, when the slide bead coating method is used, the range of 5 to 160 mPa · s is preferable and the range of 60 to 140 mPa · s is more preferable in the preferable temperature range of the coating solution. Moreover, when using a curtain application | coating system, in the preferable temperature range of said coating liquid, the range of 5-1200 mPa * s is preferable, More preferably, it is the range of 25-500 mPa * s. If it is the range of such a viscosity, simultaneous multilayer coating can be performed efficiently.

  Moreover, as a viscosity at 15 degreeC of a coating liquid, 100 mPa * s or more is preferable, 100-30000 mPa * s is more preferable, More preferably, it is 2500-30000 mPa * s.

  The conditions for the coating and drying method are not particularly limited. For example, in the case of the sequential coating method, first, any one of the coating liquids for the color material layer heated to 30 to 60 ° C. is coated on the substrate or the process film. After forming a layer by drying, the color material layer precursor is formed by applying and drying on this layer in sequence using another color material layer coating solution. When drying, it is preferable to dry the formed coating film at 30 ° C. or higher. For example, it is preferable to dry in the range of 5-50 ° C. wet bulb temperature and 5-100 ° C. (preferably 10-50 ° C.) film surface temperature. For example, warm air of 40-60 ° C. is blown for 1-5 seconds. dry. As a drying method, warm air drying, infrared drying, and microwave drying are used. Further, drying in a multi-stage process is preferable to drying in a single process, and it is more preferable to set the temperature of the constant rate drying section <the temperature of the rate-decreasing drying section. In this case, the temperature range of the constant rate drying part is preferably 30 to 60 ° C., and the temperature range of the decreasing rate drying part is preferably 50 to 100 ° C.

  Moreover, the conditions of the application | coating and drying method in the case of performing simultaneous multilayer application | coating are heating the color material layer coating liquid to 25-60 degreeC, and simultaneous multilayer of the color material layer coating liquid on a base material or a process film. After coating, it is preferable that the temperature of the formed coating film is preferably cooled (set) to 1 to 15 ° C. and then dried at 10 ° C. or higher. More preferable drying conditions are a wet bulb temperature of 5 to 50 ° C. and a film surface temperature of 10 to 50 ° C. For example, it is dried by blowing warm air of 80 ° C. for 1 to 5 seconds. Moreover, as a cooling method immediately after application | coating, it is preferable to carry out by a horizontal set system from a viewpoint of the uniformity improvement of the formed coating film.

  Here, the term “set” means that the viscosity of the coating composition is increased by means such as applying cold air to the coating film to lower the temperature, the fluidity of the substances in each layer and in each layer is reduced, or gelation is performed. It means the process to do. A state in which the cold air is applied to the coating film from the surface and the finger is pressed against the surface of the coating film is defined as a set completion state.

  The time (setting time) from the time of application to the completion of setting by applying cold air is preferably within 5 minutes, and more preferably within 2 minutes. Further, the lower limit time is not particularly limited, but it is preferable to take 45 seconds or more. The temperature of the cold air is preferably 0 to 25 ° C, and more preferably 5 to 10 ° C. The time for which the coating film is exposed to cold air is preferably 10 to 360 seconds, more preferably 10 to 300 seconds, and still more preferably 10 to 120 seconds, although it depends on the transport speed of the coating film.

  The transmissive screen according to the present invention has high transparency (transmittance) despite including two or more color material layers. Specifically, the total line transmittance of the transmission screen according to the present invention is preferably 73% or more, more preferably 75% or more, still more preferably 78% or more, and even more preferably 80% or more. Yes, particularly preferably 82% or more. In addition, the value measured by the method as described in the column of the Example mentioned later shall be employ | adopted as a value of the total line transmittance of a transmissive screen.

  Further, it is preferable that the reflection of light between two or more colorant layers is suppressed because the visibility of the displayed image is increased. From this viewpoint, the reflectance of visible light (wavelength 340 to 700 nm) at the interface between two or more colorant layers is preferably 5% or less, and more preferably 1% or less. In addition, this reflectance is calculated | required by optical simulation (FTG Software Associates Film DESIGN Version 2.23.3700).

  As described above, according to the present invention, a transmissive screen having high transparency, excellent color reproducibility, and excellent long-term stability in a high temperature and high humidity environment, and a display system using the same are provided. Can be done. The mechanism by which such an effect is manifested is assumed as follows. That is, in order to maintain the transparency (transmittance) of the transmission screen high, the color material needs to be included in the color material layer in a highly dispersed state. When a plurality of color materials having different diameters are included in the color material layer composed of the single layer, the dispersion state is biased due to the difference in particle size. On the other hand, by providing two or more color material layers as in the configuration according to the present invention, it becomes easy to make each color material exist in a highly dispersed state in each color material layer, and the transparency (transmission of the screen) Rate) is thought to be maintained high. Moreover, since the thickness of the color material layer can be made relatively large as described above, it is possible to include a relatively large amount of color material in the color material layer, resulting in excellent color reproducibility. It is believed that a transmissive screen can be achieved.

  The present invention will be specifically described using the following examples and comparative examples. However, the technical scope of the present invention is not limited to the following examples. Unless otherwise specified, “%” and “part” mean “% by mass” and “part by mass”, respectively. Unless otherwise specified, each operation was performed at room temperature (25 ° C.).

≪Preparation and preparation of coloring materials (metal nanoparticles) ≫
(Preparation of blue scattering color material)
As a blue scattering color material, 0.02 mg / mL aqueous dispersion of silver nanoparticles manufactured by Aldrich was prepared. In addition, the average particle diameter of the silver nanoparticles (blue scattering color material) was 60 nm, and D90 was 64 nm. The maximum peak wavelength of the surface plasmon resonance scattering intensity was 450 nm. The average particle diameter of the silver nanoparticles (blue scattering colorant) and the value of D90 are values obtained from the measurement of the particle size distribution using a particle size measuring apparatus (Malvern Instruments, Zetasizer Nano S) by a dynamic light scattering method. (Hereinafter, the same applies to all average particle diameters).

(Preparation of green scattering colorant)
Metal nanoparticles having a core-shell structure were prepared by the following method.

  First, colloidal silica (manufactured by Nissan Chemical Industries, Snowtex (registered trademark) AK-L, average particle diameter of silica particles: 45 nm, silica concentration: 20% by mass) was used as the core particles.

When this colloidal silica is diluted with ethylene glycol to give a silica particle concentration of 1% by mass and heated to 170 ° C., an ethylene glycol solution of silver nitrate (silver nitrate concentration: 1.0 × 10 ⁻¹ mol / L), An ethylene glycol solution (PVP concentration: 5.0 × 10 ⁻¹ mol / L) of polyvinyl pyrrolidone (PVP) was added at a constant flow rate using a double jet method. At this time, the shape of the reacted particles is measured every 10 minutes, and when the average particle size reaches about 75 nm, the particles are taken out, and the metal nanoparticles having a core-shell structure (silica core + silver shell) (green scattering colorant) It was. When the particle size distribution of the metal nanoparticles was measured, the average particle size was 75.3 nm and D90 was 82 nm. Moreover, it was 16 nm when the shell thickness was confirmed by SEM. The maximum peak wavelength of the surface plasmon resonance scattering intensity of the metal nanoparticles (green scattering color material) was 533 nm.

(Preparation of red scattering colorant)
Colloidal silica (manufactured by Nissan Chemical Industries, Snowtex (registered trademark) AK-YL, average particle diameter of silica particles: 70 nm, silica concentration: 10% by mass) was used as the core particles. Except that the addition of silver nitrate ethylene glycol solution and polyvinyl pyrrolidone (PVP) ethylene glycol solution was performed until the average particle size of the particles reached about 90 nm, and the particles were taken out, the same as the preparation of the green scattering colorant described above. A red scattering color material was prepared by the method described above. When the particle size distribution of the metal nanoparticles was measured, the average particle size was 90.2 nm and D90 was 102 nm. Moreover, it was 11 nm when the shell thickness was confirmed by SEM. The maximum peak wavelength of the surface plasmon resonance scattering intensity of the metal nanoparticles (green scattering color material) was 645 nm.

≪Preparation of coating material for color material layer≫
Using the color material prepared and prepared above, each color material layer coating solution was prepared by the following method.

(Preparation of coating liquid L1 for blue scattering layer)
To the blue scattering color material (silver nanoparticles) prepared above, 2 parts by weight, 3 parts by weight of 5% by weight aqueous solution of polyvinyl alcohol (PVA-103, polymerization degree 300, saponification degree 98.5 mol%, manufactured by Kuraray Co., Ltd.) After adding 10 parts by weight of an aqueous boric acid solution, while heating to 45 ° C. and stirring, a 5% by weight aqueous solution of polyvinyl alcohol (PVA-103, polymerization degree 300, saponification degree 98.5 mol%, manufactured by Kuraray) 20 The coating solution L1 for blue scattering layers was prepared by adding 1 part by mass of 1 part by mass aqueous solution of 1 part by mass of a surfactant and a surfactant (Rapisol A30, manufactured by NOF Corporation) and 27 parts by mass of pure water. The concentration of the color material in the obtained coating solution was 0.0004% by mass.

(Preparation of coating liquid L2 for green scattering layer)
To the green scattering color material (core-shell metal nanoparticles) prepared above, 2 parts by weight, 3 parts by weight of a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray Co., Ltd.) After adding 10 parts by weight of a 10% aqueous boric acid solution, the mixture was heated to 45 ° C. and stirred, while a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray Co., Ltd.). 20 parts by mass, 1 part by mass of a 1% by mass aqueous solution of a surfactant (Lapisol A30, manufactured by NOF Corporation) were added, and 27 parts by mass of pure water were added to prepare a coating solution L2 for green scattering layer. The concentration of the color material in the obtained coating solution was 0.0004% by mass.

(Preparation of coating liquid L3 for red scattering layer)
2 masses of 5 mass% aqueous solution of polyvinyl alcohol (JC-25, polymerization degree 2500, saponification degree 99.5 mol%, manufactured by NIPPON BI POVAL Co., Ltd.) to the red scattering colorant (core shell metal nanoparticles) prepared above. Parts of a 3% by weight aqueous boric acid solution and 10 parts by weight of a boric acid solution, respectively, and then heated to 45 ° C. while stirring, with polyvinyl alcohol (PVA-103, polymerization degree 300, saponification degree 98.5 mol%, manufactured by Kuraray). 20 parts by mass of a 5% by mass aqueous solution, 1 part by mass of a 1% by mass aqueous solution of a surfactant (Lapisol A30, manufactured by NOF Corporation) are added, and 27 parts by mass of pure water are added to prepare a coating solution L3 for a red scattering layer. did. The concentration of the color material in the obtained coating solution was 0.0004% by mass.

(Preparation of coating liquid L4 for green / red scattering layer)
Polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray Co., Ltd.) was added to the red scattering colorant (core-shell metal nanoparticles) and green scattering colorant (core-shell metal nanoparticles) prepared above. After adding 2 parts by weight of a 5% by weight aqueous solution and 10 parts by weight of a 3% by weight aqueous boric acid solution, while heating to 45 ° C. and stirring, polyvinyl alcohol (PVA-217, polymerization degree 1700, polymerization degree 300, saponification) 20 parts by weight of 5% by weight aqueous solution of 88.0 mol%, manufactured by Kuraray), 1 part by weight of 1% by weight aqueous solution of a surfactant (Rapidol A30, manufactured by NOF Corporation), and 27 parts by weight of pure water were added. Thus, a coating solution L4 for a green / red scattering layer was prepared. The concentration of the color material in the obtained coating liquid was 0.0002 mass% for each of the red scattering color material and the green scattering color material, and the total was 0.0004 mass%.

(Preparation of coating liquid L5 for green scattering layer)
2% by mass of 5% aqueous solution of polyvinyl alcohol (JC-25, degree of polymerization 2500, degree of saponification 99.5 mol%, manufactured by Nihon Acetate / Poval) on the green scattering colorant (core shell metal nanoparticles) prepared above. 1 part by weight, 10 parts by weight of a 3% by weight aqueous boric acid solution, and then heated to 45 ° C. while stirring, while stirring, polyvinyl alcohol (JC-25, polymerization degree 2500, saponification degree 99.5 mol%, 20 parts by weight of a 5% by weight aqueous solution (manufactured by Poval), 1 part by weight of a 1% by weight aqueous solution of a surfactant (Lapisol A30, manufactured by NOF Corporation), and 27 parts by weight of pure water are added to the green scattering layer. A coating liquid L5 was prepared. The concentration of the color material in the obtained coating solution was 0.0004% by mass.

(Preparation of coating liquid L6 for red scattering layer)
To the red scattering colorant (core shell metal nanoparticles) prepared above, 2 parts by weight, 3 parts by weight of a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray Co., Ltd.) After adding 10 parts by weight of a 10% aqueous boric acid solution, the mixture was heated to 45 ° C. and stirred, while a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray Co., Ltd.). 20 parts by mass, 1 part by mass of a 1% by mass aqueous solution of a surfactant (Lapisol A30, manufactured by NOF Corporation) were added, and 27 parts by mass of pure water was added to prepare a coating solution L6 for red scattering layer. The concentration of the color material in the obtained coating solution was 0.0004% by mass.

(Preparation of coating liquid L7 for green scattering layer)
To the green scattering colorant (core-shell metal nanoparticles) prepared above, 2% by weight of 5% aqueous solution of polyvinyl alcohol (JM-17 (degree of polymerization 1700, degree of saponification 96.4 mol%, manufactured by NIPPON BI POVAL)) 1 part by weight, 10 parts by weight of a 3% by weight boric acid aqueous solution, heated to 45 ° C., and stirred, while stirring, polyvinyl alcohol (JM-17 (degree of polymerization 1700, degree of saponification 96.4 mol%, 20 parts by weight of a 5% by weight aqueous solution (manufactured by Poval), 1 part by weight of a 1% by weight aqueous solution of a surfactant (Lapisol A30, manufactured by NOF Corporation), and 27 parts by weight of pure water are added to the green scattering layer. A coating liquid L7 was prepared, and the concentration of the coloring material in the obtained coating liquid was 0.0004% by mass.

(Preparation of coating liquid L8 for blue scattering layer)
To the blue scattering color material (silver nanoparticles) prepared above, 2 parts by weight, 3 parts by weight of 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray Co., Ltd.) After adding 10 parts by weight of an aqueous boric acid solution, while heating to 45 ° C. and stirring, a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, polymerization degree 1700, saponification degree 88.0 mol%, manufactured by Kuraray) 20 Part by weight, 1 part by weight of a 1% by weight aqueous solution of a surfactant (Lapisol A30, manufactured by NOF Corporation) was added, and 27 parts by weight of pure water was added to prepare a coating solution L8 for blue scattering layer. The concentration of the color material in the obtained coating solution was 0.0004% by mass.

(Preparation of coating liquid L9 for blue / green / red scattering layer)
To the blue scattering color material (silver nanoparticles), the green scattering color material (core shell metal nanoparticles) and the red scattering color material (core shell metal nanoparticles) (each color material equivalent mass) prepared above, polyvinyl alcohol (PVA-217, After adding 2 parts by weight of a 5% by weight aqueous solution having a degree of polymerization of 1700 and a degree of saponification of 88.0 mol%, manufactured by Kuraray Co., Ltd., and 10 parts by weight of a 3% by weight aqueous boric acid solution, respectively, 20 parts by weight of a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, degree of polymerization 1700, saponification degree 88.0 mol%, manufactured by Kuraray), 1% by weight aqueous solution 1 of a surfactant (Lapisol A30, manufactured by NOF Corporation) 1 Part by mass was added, and 27 parts by mass of pure water was added to prepare a coating solution L9 for blue / green / red scattering layer. The concentration of the color material in the obtained coating solution was equal to 0.0012% by mass for each color material.

(Preparation of coating liquid L10 for blue / green / red scattering layer)
To the blue scattering color material (silver nanoparticles), the green scattering color material (core shell metal nanoparticles) and the red scattering color material (core shell metal nanoparticles) (each color material equivalent mass) prepared above, polyvinyl alcohol (PVA-217, After adding 2 parts by weight of a 5% by weight aqueous solution having a degree of polymerization of 1700 and a degree of saponification of 88.0 mol%, manufactured by Kuraray Co., Ltd., and 10 parts by weight of a 3% by weight aqueous boric acid solution, respectively, 20 parts by weight of a 5% by weight aqueous solution of polyvinyl alcohol (PVA-217, degree of polymerization 1700, saponification degree 88.0 mol%, manufactured by Kuraray), 1% by weight aqueous solution 1 of a surfactant (Lapisol A30, manufactured by NOF Corporation) 1 A part by weight was added, and 18 parts by weight of pure water was added to prepare a coating solution L10 for blue / green / red scattering layer. The concentration of the color material in the obtained coating solution was equal to 0.0036% by mass for each color material.

<< Production of transmission type screen >>
(Preparation of transmissive screen 1)
As a substrate, a polyethylene terephthalate film (A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 50 μm was prepared and kept at 45 ° C.

  On one surface of the base material prepared as described above, the coating liquids L1, L2 and L3 prepared as described above were applied in this order using a slide hopper coating apparatus capable of multilayer coating. Immediately after the application, 5 ° C. cold air was blown for 5 minutes, and then 80 ° C. hot air was blown to dry the coating film to form each color material layer, whereby a transmission screen 1 was produced. The thickness of each color material layer was 1 μm.

(Preparation of transmissive screen 2)
As a substrate, a polyethylene terephthalate film (A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 50 μm was prepared and kept at 45 ° C.

  The coating liquid L1 prepared above was applied to one surface of the substrate prepared above by a spin coating method as described in JP-A-2009-86659. Immediately after the application, 5 ° C. cold air was blown for 5 minutes, and then 80 ° C. hot air was blown to dry the coating film to form a color material layer (blue scattering layer). Subsequently, the color material layer (green scattering layer) is formed by applying the coating liquid L2 prepared above in the same manner, and further the color material layer (red scattering layer) by applying the coating liquid L3 prepared above. ) To form a transmissive screen 2. The thickness of each color material layer was 1 μm.

(Preparation of transmissive screen 3)
A transmissive screen 3 was produced by the same method as the transmissive screen 1 described above, except that the coating liquids L1 and L4 prepared above were applied to one surface of the substrate so as to be arranged in this order. .

(Preparation of transmissive screen 4)
Except that the coating liquids L3, L8, and L5 prepared above were applied to one surface of the base material so as to be arranged in this order, the transmission type screen 4 was formed in the same manner as the transmission type screen 1 described above. Produced.

(Preparation of transmissive screen 5)
Except that the coating liquids L1, L5 and L3 prepared above were applied to one surface of the base material so as to be arranged in this order, the transmission type screen 5 was formed in the same manner as the transmission type screen 1 described above. Produced.

(Preparation of transmissive screen 6)
Except that the coating liquids L1, L7 and L3 prepared above were applied to one surface of the base material so as to be arranged in this order, the transmission type screen 6 was formed by the same method as the transmission type screen 1 described above. Produced.

(Preparation of transmissive screen 7)
Except that the coating liquids L1, L2, L3, L8, L5, and L6 prepared above were applied to one surface of the base material so as to be arranged in this order, the same method as the above-described transmission type screen 1 was used. A transmissive screen 7 was produced.

(Preparation of transmissive screen 8)
As a substrate, a polyethylene terephthalate film (A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 50 μm was prepared and kept at 45 ° C.

  The coating liquid L9 prepared above was applied to one surface of the base material prepared above by a spin coating method as described in JP-A-2009-86659. Immediately after application, 5 ° C. cold air is blown for 5 minutes, and then 80 ° C. warm air is blown to dry the coating film to form a color material layer (blue, green, red scattering layer). Produced. The thickness of the color material layer was 3 μm.

(Preparation of transmissive screen 9)
A transmissive screen 9 was produced in the same manner as the transmissive screen 8 described above except that the coating liquid L10 was used instead of the coating liquid L9 as the coating liquid.

≪Evaluation of transmissive screen≫
About the transmission type screens 1-9 produced above, Hitachi's spectrophotometer U-4100 is used, the total line transmittance of the screen (wavelength 340-700 nm), wavelength 450 nm (blue light), wavelength 530 nm (green light). And the scattering intensity at a wavelength of 640 nm (red light). In addition, about the value of scattering intensity [%], scattering intensity [%] was calculated from the difference with the measured value by measuring the sample which did not mix | blend particle | grains as a control sample. In addition, the transmission screens 1 to 9 produced above were placed in a high-temperature and high-humidity environment at 60 ° C. and 80% RH for 3 weeks, and the total line transmittance was measured in the same manner as described above. These results are shown in Table 1 below.

  From the results shown in Table 1, it can be seen that the transmissive screens 1 to 7 according to the present invention have a higher initial total line transmittance than the transmissive screens 8 and 9 of the comparative example. It was also confirmed that the scattering intensity for light corresponding to each of blue, green, and red was high. Furthermore, since the total line transmittance after exposure to a high-temperature and high-humidity environment is also maintained at a high value, it can be seen that the transmission screen according to the present invention is excellent in thermal stability.

  From the comparison between the transmission type screen 1 and the transmission type screen 2, the effect of the present invention is further improved in the case of being manufactured by the simultaneous multilayer coating method compared to the case of being manufactured by the sequential lamination method. It can be seen that it is remarkably played. Further, by comparing the transmission screen 1 and the transmission screen 3, it is possible to obtain a green scattering structure by stacking three color material layers each including a blue scattering color material, a green scattering color material, and a red scattering color material. It can also be seen that the scattering intensity for green and red can be increased more than that of the two-layer structure in which the coloring material and the red scattering coloring material are included in the same coloring material layer. Furthermore, when polyvinyl alcohol (PVA) is used as the resin binder contained in the color material layer, if the degree of saponification of PVA differs between adjacent color material layers, the initial and high temperature / high humidity environment exposure It can also be seen that the total line transmittance can be maintained at a higher value. This is considered to be due to the difficulty of mixing the color material (metal nanoparticles) at the interface between the color material layers containing PVA having different saponification degrees of PVA as a resin binder.

10 Projection system (display system),
100 projector (light source),
200 transmissive screen,
210 substrate,
220 color material layer,
222 blue scattering layer,
222B Blue scattering colorant,
224 green scattering layer,
224G Green scattering colorant,
226 red scattering layer,
226R Red scattering color material.

Claims (16)

A transmissive screen having at least two colorant layers,
The transmissive screen, wherein the at least two color material layers include color materials that perform surface plasmon resonance scattering of light of different wavelengths.   2. The transmissive screen according to claim 1, wherein at least one of the coloring materials is for surface plasmon resonance scattering of light having a wavelength of 380 to 740 nm.   The transmissive screen according to claim 1, wherein the color material layer includes different metal nanoparticles as color materials.   The transmissive screen according to claim 3, wherein the metal nanoparticles have a core-shell structure, and the total line transmittance of the core constituting the core-shell structure is 90% or more.   The transmissive screen according to claim 3 or 4, wherein the constituent material of the surface of the metal nanoparticles is one or more metals selected from the group consisting of silver, gold and copper. The color material layer is
A red scattering layer comprising a red scattering colorant having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 600 to 720 nm;
A green scattering layer containing a green scattering colorant having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 500 to 600 nm;
A blue scattering layer containing a blue scattering colorant having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 420 to 500 nm;
The transmissive screen according to claim 1, comprising at least three layers. The average particle diameter of the blue scattering colorant _(R B), the average particle size of the average particle size of the green scattering colorant _{(R G)} and the red scatter colorant _{(R R) is, R} B _<R G _<R The transmission screen according to claim 6, wherein the transmission screen satisfies the relationship of _R.   The transmissive screen according to claim 1, wherein the color material layer includes a binder resin.   The transmission screen according to any one of claims 1 to 8, wherein the binder resin is a polyvinyl alcohol.   The transmissive screen according to claim 9, wherein among the at least two color material layers, adjacent color material layers contain polyvinyl alcohols having different saponification degrees as binder resins.   The transmissive screen according to any one of claims 1 to 10, wherein a reflectance of visible light (wavelength of 340 to 700 nm) at an interface between the color material layers is 1% or less.   The transmissive screen according to any one of claims 1 to 11, wherein the total line transmittance (wavelength of 340 to 700 nm) is 79% or more.   The transmissive screen according to claim 1, further comprising a base material, wherein the color material layer is disposed on the base material. It is a manufacturing method of the transmission type screen according to any one of claims 1 to 13,
The manufacturing method including the process of forming the said at least 2 layer of said color material layer by carrying out simultaneous multilayer application | coating of the coating liquid containing the said color material on the surface of the said base material. The transmissive screen according to any one of claims 1 to 13, or the transmissive screen manufactured by the manufacturing method according to claim 14,
A light source that projects projection light corresponding to an image to be displayed on the transmission screen;
Display system with. The color material layer in the transmissive screen is
A red scattering layer containing a red scattering colorant having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 600 to 720 nm;
A green scattering layer containing a green scattering colorant having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 500 to 600 nm;
A blue scattering layer containing a blue scattering colorant having a maximum peak wavelength of surface plasmon resonance scattering intensity in a region of 420 to 500 nm;
Having at least three layers in this order,
The display system according to claim 15, wherein projection light from the light source is projected from the blue scattering layer side of the at least three layers.