JP2019099678A - Coating material for image display body and image display body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the degree of freedom in setting a total light transmittance and a haze of an image display body. An image display body forming paint is a paint for forming an image display body. The image display body is an object for displaying an image. The image display body includes a light scattering layer. The light scattering layer scatters the light when it is incident. The light scattering layer contains zirconia particles, a transmission layer forming material, and graphite particles. The transmissive layer forming material forms a transmissive layer through which light can be transmitted. It is desirable that the transparent layer forming material is a film-forming transparent resin. The film-forming transparent resin forms a transparent film as a transparent layer when the solvent is vaporized. The mass% of the zirconia particles with respect to the mass sum is 20% or more. The mass% of the graphite particles with respect to the mass sum is 0.2% or more. [Selection diagram] Fig. 1

Description

  The present invention relates to a paint for forming an image display body and an image display body.

  Patent Document 1 discloses a transparent screen film. The film for transparent screen contains a resin layer and inorganic particles. The inorganic particles are contained in the resin layer at least partially in an aggregated state. The primary particles of the inorganic particles have a median size of 0.1 to 50 nanometers and a maximum particle size of 10 to 500 nanometers. The content of the inorganic particles is 0.015 to 1.2% by mass with respect to the resin. The inorganic particles are metal particles. According to the transparent screen film disclosed in Patent Document 1, it is possible to clearly project and display product information, an advertisement, and the like on a transparent partition or the like without impairing the transmission visibility.

JP, 2015-212800, A

  However, the transparent screen film disclosed in Patent Document 1 has a problem that it is difficult to set the total light transmittance and the haze separately.

  Often it is preferred that the total light transmission of the transparent screen be high. The height of the total light transmittance is to indicate the degree of transparency in the transparent screen. However, a transparent screen with high total light transmittance is not always desirable. For example, when it is intended to represent an image by reflection of light projected onto the screen, it is preferable that the total light transmittance of the screen be somewhat low. This is because when the total light transmittance is low to some extent, the image becomes clearer than when it is high.

  On the other hand, when not only trying to express an image by light reflection but also using light transmitted through the screen, if the total light transmittance is too low, the purpose of using light transmitted through the screen can not be achieved. . In this case, raising the haze may make it easier to see the image appearing on the screen. However, for example, in the case where the total light transmittance decreases as the haze is increased, if the haze is increased, the purpose of utilizing the light transmitted through the screen can not be achieved. An example of using light transmitted through the screen is to introduce light into the room through the screen.

  If it is difficult to set the total light transmittance and the haze individually, one of the settings will naturally determine the other. If one of the settings is determined according to the setting of the other, if at least one of the total light transmittance and the haze thus set does not reach the level required by the user, the screen is displayed for the user It will be unsatisfactory for you.

  It is desirable not only to improve the freedom of setting the total light transmittance and the haze on the screen, but also to solve the problems that the user can directly feel. For example, in order to make the image appearing on the screen more visible and to use the light transmitted through the screen, it is desirable to solve the problems described below. The first problem is that, among the images appearing on the front and back of the screen, the viewer of the image represented by the light transmitted through the screen may feel the light dazzled. The second point is that the images appearing on the front and back of the screen may be blurred.

  The present invention solves such a problem. The object of the present invention is to provide a paint for forming an image display which can be used in the manufacture of an image display to improve the freedom of setting of the total light transmittance and the haze of the image display and the image display. It is in.

  Another object of the present invention is to provide a paint for forming an image display which is hard to feel transmitted light and which can make the image appear sharper, and an image display thereof.

  As a result of intensive studies on the above problems, the present inventors have found that the image display body is provided with a permeable layer containing zirconia particles, and the permeable layer contains graphite particles in addition to the zirconia particles, It has been found that the degree of freedom of setting the total light transmittance and the haze of the transmission layer and thus of the image display can be improved, and the present invention has been completed. That is, the present invention is as follows.

  In order to solve the above problems, according to one aspect of the present invention, a paint for forming an image display body includes zirconia particles, a solvent, a transmission layer forming material, and graphite particles. The transmission layer forming material forms a transmission layer through which light can be transmitted when the solvent is vaporized.

  Moreover, the mass% of the zirconia particle with respect to the mass sum mentioned above is 20% or more. The mass sum is the sum of the mass of the zirconia particles, the mass of the graphite particles, and the mass of the permeable layer-forming material. In this case, the mass% of the graphite particles to the mass sum is 0.2% or more. In this case, the sum of the mass% of the graphite particles to the mass sum and the mass% of the zirconia particles to the mass sum is less than 100%.

  The transmission layer forming material forms a transmission layer through which light can be transmitted when the solvent is vaporized. The zirconia particles and the graphite particles are held in the permeable layer by the material for forming the permeable layer. The zirconia particles and the graphite particles have different degrees of influence on the total light transmittance and the haze in the transmission layer. Thus, one of the differences in the total light transmittance and the haze which appears when one of the mass% of the zirconia particles and the mass% of the graphite particles is different is the mass% of the zirconia particles and the mass% of the graphite particles. It can cancel out by the other being different. As a result, it is possible to improve the degree of freedom in setting the total light transmittance and the haze of the image display body in which the transmission layer and thus the transmission layer function as a light scattering layer.

  When the mass percentage of the zirconia particles with respect to the mass sum is 20% or more, when the image display body is formed, it becomes difficult to feel glare when viewing the image appearing on the back surface. Since the mass% of the graphite particles to the mass sum is 0.2% or more, when the image display body is formed, the image appearing on the front and the back becomes clear.

  Moreover, it is preferable that the mass% of the graphite particle with respect to the mass sum mentioned above is 0.2% or more and 1.64% or less.

  When the mass percentage of the graphite particles to the mass sum is 0.2% or more and 1.64% or less, the image appearing on the front surface and the back surface when the image display body is formed is variously compared with the case where it is not so It becomes visible at an angle.

  Alternatively, it is preferable that the mass% of the graphite particles with respect to the above-described mass sum is 0.21% or more and 0.41% or less.

  When the mass percentage of the graphite particles with respect to the mass sum is 0.21% or more and 0.41% or less, when the image display body according to the present invention is formed, it appears on the front and back as compared with the other case. The image will be clear.

  Alternatively, it is desirable that the mass% of the zirconia particles with respect to the above-mentioned mass sum is 25% or more.

  Alternatively, it is desirable that the mass% of the graphite particles with respect to the above-mentioned mass sum is 0.83% or more.

  According to another aspect of the present invention, the image display comprises a light scattering layer. The light scattering layer scatters the light when it is incident. The image display body is an object for displaying an image. The light scattering layer contains zirconia particles, a material for forming a transmission layer, and graphite particles. The transmission layer forming material forms a transmission layer through which light can be transmitted.

  Moreover, the mass% of the zirconia particle mentioned above with respect to mass sum is 20% or more. The mass sum is the sum of the mass of the zirconia particles, the mass of the graphite particles, and the mass of the permeable layer-forming material. In this case, the mass% of the graphite particles to the mass sum is 0.2% or more. In this case, the sum of the mass% of the graphite particles to the mass sum, the mass% of the zirconia particles to the mass sum, and the mass% of the transmission layer-forming material to the mass sum is less than 100%.

  One of the differences in the total light transmittance and the haze, which is caused by the difference between the mass% of the zirconia particles and the mass% of the graphite particles, is the other of the mass% of the zirconia particles and the mass% of the graphite particles. It is possible to cancel out. As a result, it is possible to improve the degree of freedom in setting the total light transmittance and the haze of the image display body in which the transmission layer and thus the transmission layer function as a light scattering layer.

  With the mass% of the zirconia particles to the mass sum being at least 20% and the mass% of the graphite particles to the mass sum being at least 0.2%, the image appearing on the front and back of the image display body becomes sharp .

  Moreover, it is desirable that the total light transmittance of the image display body mentioned above is 60% or less. In this case, the haze of the image display body is desirably 97% or more. As a result, both the image formed by the light reflected from the image display of the present invention and the image formed by the light transmitted through the image display of the present invention become bright. In addition, the possibility of the light transmitted through the image display body of the present invention becoming dazzling can be further suppressed.

  Further, it is desirable that the luminance ratio of the reflected light be 0.2 or more. The luminance ratio of the reflected light is a quotient calculated by dividing the luminance of the smaller reflected light of the two types of reflected light to be described next by the luminance of the larger reflected light. The luminance of the first type of reflected light is the luminance of the reflected light in the incident direction side as viewed from the normal direction of the image display body and in a direction inclined by 60 ° with respect to the normal direction. The luminance of the second type of reflected light is the luminance of the reflected light in the direction opposite to the incident direction as viewed from the normal direction and in a direction inclined by 60 ° with respect to the normal direction. These reflected lights are reflected lights of the light irradiated from the incident direction. The incident direction is a direction inclined 45 ° with respect to the normal direction. When the luminance ratio of reflected light is 0.2 or more, it is desirable that the luminance ratio of transmitted light is 0.5 or more. The luminance ratio of the transmitted light is a quotient calculated by dividing the luminance of the smaller one of the luminances of the two types of light described next by the luminance of the larger light. The luminance of the first type of light is the luminance of light transmitted through the image display body in a direction inclined 120 ° with respect to the normal direction as viewed from the origin when the normal direction viewed from the origin is 0 °. The origin is a point where light irradiated to the image display body from the normal direction of the image display body penetrates the image display body. The luminance of the second type of light is the luminance of light transmitted through the image display body in a direction inclined by 150 ° with respect to the normal direction as viewed from the origin. Thus, an image formed by light reflected from the image display body and an image formed by light transmitted through the image display body can be viewed from various directions.

  According to the present invention, the freedom of setting the total light transmittance and the haze of the image display body can be improved. Further, according to the present invention, it is difficult to feel the transmitted light glare, and the image can be more clearly shown.

It is a figure which shows the influence of the mass% of a graphite particle on the total light transmittance in the Example and comparative example concerning one embodiment of this invention. It is a figure which shows the influence of the mass% of a zirconia particle on the total light transmittance in the comparative example concerning one embodiment of this invention. It is a figure which shows the influence of the thickness of a light-scattering layer on the total light transmittance in the comparative example concerning one embodiment of this invention. It is a figure which shows the influence of the mass% of a zirconia particle on a haze in the comparative example concerning one embodiment of this invention. It is a figure which shows the definition of the brightness | luminance of reflected light, and the brightness | luminance of transmitted light.

[Description of nature of image display body]
Embodiments of the present invention will be described in detail below. There is known an image display which scatters light projected from a projector and forms an image by the light. Such an image display can be used, for example, as a screen for video display. In the image display body according to the present embodiment, the user can view the image formed by the light reflected therefrom, and the user can view the image formed by the light transmitted therethrough. It is desirable that the image display body according to the present embodiment satisfies the following requirements. The requirements are that the total light transmittance is 60% or less and the haze is 97% or more.

  When the total light transmittance in the image display of the present embodiment is too high, the image formed by the light reflected from the image display becomes too dark. When the total light transmittance of the image display body of the present embodiment is 60% or less, the light formed by the light reflected from the image display body of the present embodiment is also the light transmitted through the image display body of the present embodiment The image formed by is also brighter. When the total light transmittance in the image display body of the present embodiment is 60% or less and the amount of light absorbed by the image display body is large, although the brightness of the image is suppressed, the image is sharper It becomes.

  If the haze in the image display body of the present embodiment is too low, a person who looks at the light transmitted through the image display body feels the light glare. When the haze in the image display body of the present embodiment is 97% or more, the possibility of the light transmitted through the image display body of the present embodiment being dazzling can be suppressed.

  It is more desirable that the image display body of the present embodiment satisfies the following requirements in addition to the requirements described above. The requirement is that the luminance ratio of the reflected light is 0.2 or more and the luminance ratio of the transmitted light is 0.5 or more.

  If the luminance ratio of the reflected light in the image display body of the present embodiment is too low, the range in which the image formed by the light reflected from the image display body can be viewed becomes too narrow. When the luminance ratio of reflected light in the image display body of the present embodiment is 0.2 or more, images formed by light reflected from the image display body of the present embodiment can be viewed from various directions.

  If the luminance ratio of the transmitted light in the image display of this embodiment is too low, the range in which the image formed by the light reflected from the image display can be viewed becomes too narrow. When the luminance ratio of transmitted light in the image display body of the present embodiment is 0.5 or more, images formed by light transmitted through the image display body of the present embodiment can be viewed from various directions.

[Description of structure of image display body]
The image display body according to the present embodiment includes a light scattering layer. The light scattering layer scatters the light when it is incident. In the present embodiment, the light scattering layer is plate-like. The image display body according to the present embodiment may include any layer in addition to the light scattering layer. However, the layer enables the user to view the image formed by the light reflected from the image display body according to the present embodiment and the user to view the image formed by the light transmitted through the layer. is there. Of course, the image display body according to the present embodiment may consist of only the light scattering layer. Moreover, the specific form of the image display body concerning this embodiment is not specifically limited. For example, it may be a known screen. For example, it may be a building material that can be installed instead of the known flat glass. For example, it may be a plate-like object that is neither a well-known screen nor a building material that can be installed instead of well-known plate glass. It may be a pillared acrylic resin.

  The thickness of the light scattering layer according to the present embodiment is desirably 1 micrometer or more and 200 micrometers or less. The thickness is more preferably 2 micrometers or more and 100 micrometers or less. The thickness is more preferably 5 micrometers or more and 50 micrometers or less. By setting the thickness to 1 micrometer or more, a constant scattered light intensity can be secured. By setting the thickness to 200 micrometers or less, the blur of the image can be suppressed.

(Description of the components of the light scattering layer)
The material of the light scattering layer contains zirconia particles, a transmission layer forming material, and graphite particles.

The size and shape of the zirconia particles are not particularly limited. For example, the average particle diameter of the zirconia particles used in the present embodiment may be 5 nanometers or more and 400 nanometers or less. The shape of the zirconia particles used in the present embodiment may be spherical. In addition, it is desirable that the BET value of this zirconia particle is 50 m ² per gram or more. It is desirable that the BET value is 50 m ² per gram or more because the particle size distribution of the secondary particle size can be easily controlled. Quality control becomes easy when the reproducibility of the particle size distribution of the secondary particle size is obtained. It is more preferable that the BET value of the zirconia particles is 150 m ² per gram or more. On the other hand, it is desirable that the BET value of this zirconia particle is 1000 m ² per gram or less. It is because it is easy to keep the crystallinity of the zirconia good. It is further desirable that the BET value of this zirconia particle is 300 m ² per gram or less. The large BET value of the zirconia particles corresponds to the small particle diameter of the zirconia particles. Incidentally, it is desirable that the zirconia particles be produced by supercritical hydrothermal synthesis.

  The permeable layer forming material is a material that forms the permeable layer. Light can be transmitted through the transmission layer. The zirconia particles and the graphite particles are retained in the permeable layer by being contained in the permeable layer forming material. The type of permeable layer forming material is not particularly limited. The transmission layer forming material is preferably a synthetic resin that does not disturb the transmission of light as much as possible. Among the above-mentioned synthetic resins, it is more preferable that the material for the permeable layer is one that maintains fluidity by the solvent and solidifies when the solvent is vaporized. Examples of such synthetic resins include polyester resins, polyethylene terephthalate, acrylic resins, polycarbonates, polystyrenes and vinyl resins.

  The size and shape of the graphite particles are also not particularly limited. For example, the average diameter of the graphite particles used in the present embodiment may be 5 micrometers or more and 100 micrometers or less. However, when the shape of the graphite particles according to the present embodiment is flaky, it is preferable that the thickness thereof is not less than the thickness of one layer of graphite atoms and not more than 100 nanometers. More preferably, the shape of the graphite particles used in the present embodiment is a flaky shape having a thickness of 10 nm to 30 nm. When the graphite particles are flaky, the aspect ratio is preferably as high as possible.

  The concentration of zirconia particles in the light scattering layer and the concentration of graphite particles in the light scattering layer can be arbitrarily set as long as the following three requirements are satisfied. The first requirement is that the mass percentage of the zirconia particles to the mass sum is 20% or more. The second requirement is that the mass percentage of the graphite particles to the mass sum is 0.2% or more. The third requirement is a requirement that the sum of the mass% of the zirconia particles to the mass sum and the mass% of the graphite particles to the mass sum be less than 100%. When the concentration of the zirconia particles in the light scattering layer and the concentration of the graphite particles in the light scattering layer are low, the haze is lowered accordingly. When the haze is low, a person facing the image display body according to the present embodiment can clearly see an image of an object on the other side of the image display body according to the present embodiment. The mass% of the zirconia particles relative to the mass sum is desirably 25% or more. More preferably, the mass% of the zirconia particles to the mass sum is 40% or more.

  The thickness of the light scattering layer is desirably 1 micrometer or more and 200 micrometers or less. The thickness is more preferably 2 micrometers or more and 100 micrometers or less. The thickness is more preferably 5 micrometers or more and 50 micrometers or less. By setting the thickness to 1 micrometer or more, a constant scattered light intensity can be secured. By setting the thickness to 200 micrometers or less, the blur of the image can be suppressed.

  The image display body according to the present embodiment may include components different from the components described above. Examples include well-known pigments, polymeric dispersants, surfactants and the like. For example, by adding an inorganic material such as calcium carbonate, barium sulfate, titanium oxide, or zinc oxide, the dispersibility of zirconia can be increased, or a smooth appearance can be achieved by including a large number of pigment particles. . By including the pigment, the image display body according to the present embodiment has various colors.

[Description of paint]
The image display body according to the present embodiment can also be formed, for example, by applying the paint for forming an image display body according to the present embodiment on the surface of a known inorganic material of a glass plate or a transparent resin material. When the paint for forming an image display body is dried on the surface of the glass plate, the glass plate covered with the paint for forming an image display body becomes an image display body according to the present embodiment. The paint for forming an image display body according to the present embodiment contains zirconia particles, graphite particles, a solvent, and a transmission layer forming material.

  The solvent according to the present embodiment is a component of the paint for forming an image display which maintains the fluidity of the paint for forming an image display until it is applied, and which evaporates after being applied. In the paint according to the present embodiment, the components of the solvent are not particularly limited. The solvent may be a mixture or a pure substance. However, the solvent can disperse zirconia particles and graphite particles in the solvent. It is desirable that the solvent be well mixed with the liquid containing the synthetic resin. Examples of such solvents are methyl ethyl ketone and propylene glycol monomethyl ether.

  The description of the zirconia particles, the graphite particles, and the permeable layer-forming material is as described above, and thus the description is not repeated here.

[Description of manufacturing method]
The manufacturing method of the image display body concerning this embodiment is not specifically limited. One example is to apply the paint for forming an image display body according to the present embodiment to the surface of a known glass plate, as described above. Another example is molding a mixture of zirconia particles, graphite particles and a transparent synthetic resin (which is a molten state), which is a material for forming a permeable layer, into a plate.

  The method for producing the paint for forming an image display body according to the present embodiment is also not particularly limited. One example is that zirconia particles, graphite particles, and film forming transparent resin are separately dispersed in a solvent, and the zirconia particles dispersed in the solvent, the graphite particles, and the film forming transparent resin are mixed. There is a way.

[Description of use and usage method]
The paint for forming an image display body according to the present embodiment is used for manufacturing the image display body according to the present embodiment. The image display body according to the present embodiment is used to project at least one of a still image and a moving image. The specific method of use is the same as the well-known screen conventionally used. In addition, the image display body concerning this embodiment is well applicable to the use which utilizes the image formed by transmitted light also to the use which utilizes the image formed by reflected light.

  The invention according to the present embodiment will be specifically described below with reference to examples. However, the invention according to the present embodiment is not limited to these examples.

Example 1
(1) Preparation of paint (A) Preparation of zirconia particle dispersion The operator prepared the zirconia particle dispersion according to the present example in accordance with the following procedure. First, the worker mixed Zirconeo (registered trademark), which is zirconia particles manufactured by ITEC Corporation, in methyl ethyl ketone. BET value of mixed zirconia particles was ² per gram 242m. The zirconia particles were produced by supercritical hydrothermal synthesis. The crystal phase of the zirconia particles analyzed by X-ray diffraction was predominantly tetragonal. As a result, the refractive index of this zirconia particle was slightly higher than the refractive index of monoclinic zirconia. When analyzed by X-ray diffraction, the width of the peak of the X-ray intensity was wide when the angle between the sample surface and the X-ray was about 30 degrees. The half width of this peak directly read from the measured value was as large as 3.8 °. As a result, the peak of the X-ray generated by the irradiation of the X-ray to the monoclinic crystal was buried in the peak generated by the irradiation of the X-ray to the other crystal. This means that the crystallite diameter of the sample is small. Incidentally, if the width of the X-ray intensity peak is 0.5 ° or more, quality control in the production of the zirconia particle dispersion can be easily performed. When the width of the X-ray intensity peak is 10 ° or less, the light scattering properties of zirconia can be maintained. The mass% of the zirconia particles in the zirconia particle-containing methyl ethyl ketone was 30 mass%. Next, the worker charged the zirconia particle-containing methyl ethyl ketone with known beads for particle grinding. Next, the worker stirred the methyl ethyl ketone containing zirconia particles with a magnetic stirrer. The zirconia particles were thereby broken up by the beads. During stirring of the zirconia particle-containing methyl ethyl ketone, the particle diameter of the zirconia particle was repeatedly measured by a particle size measuring device (Manufacturer: Otsuka Electronics Co., Ltd., model number: FPAR-1000). The measurement method was dynamic light scattering (DLS). The operation of crushing the zirconia particles was continued until the average particle size of the zirconia particles was 400 nm. After the work, the beads were removed. The bead-free methyl ethyl ketone containing zirconia particles is the zirconia particle dispersion according to this example.

(B) Preparation of Graphite Particle Dispersion The operator prepared the graphite particle dispersion according to the present example in accordance with the following procedure. First, a worker mixed iGurafen (registered trademark), which is a graphite particle manufactured by ITEC Corporation, in methyl ethyl ketone. BET value of entrained graphite particles was ² per gram 27m. Incidentally, the BET value of graphite represents the degree of exfoliation of graphite. The larger the BET value, the thinner the graphite. When the BET value of graphite is 2.5 m ² per gram or more, the light reflection / absorption surface per unit weight increases. As a result, the characteristics of the screen including this are improved. More preferably, the BET value of graphite is 5 m ² per gram or more. If the BET value is 250 m ² per gram or less, the oil absorption amount is suppressed to facilitate dispersion in the paint, or multiple reflection is suppressed to maintain light reflection characteristics. More preferably, the BET value is 125 or less m ² per gram. The mass% of the graphite particles in the graphite particle-containing methyl ethyl ketone was 5% by mass. Next, the worker put the methyl ethyl ketone containing graphite particles in a jet mill (Manufacturer: Sugino Machine Co., Ltd., model number: Starburst HJP-25008). The graphite particles were broken up in the jet mill. The work of crushing the graphite particles was continued until the average particle size of the graphite particles was 5 micrometers. The graphite particle-containing methyl ethyl ketone is a graphite particle dispersion according to this example. In addition, when the Raman spectrum of this graphite particle was measured, the peak height of D band was 12% of the peak height of G band. This indicates that there are few crystal defects in the graphite particles, which is advantageous for light reflection characteristics. The smaller the ratio of the peak height of D band to the peak height of G band, the better. It is particularly desirable for this ratio to be less than 30%, and even more desirable to be less than 15%.

(C) Mixing First, the worker is a zirconia particle dispersion, a graphite particle dispersion, and a toluene solution of acrylic rubber (hereinafter referred to as "acrylic rubber liquid") so that the following two requirements are satisfied. The mixture was mixed with Toupe Co., Ltd. The first requirement is that the mass% of the zirconia particles is 49.9 mass% with respect to the sum of the mass of the zirconia particles, the mass of the graphite particles and the mass of the acrylic rubber. The second requirement is that the mass percentage of graphite particles to the sum of zirconia particles, graphite particles and acrylic rubber is 0.21 mass%. The liquid obtained by this mixing is the paint according to this example. The mass% of the acrylic rubber in the acrylic rubber liquid was 30 mass%.

(2) Preparation of Image Display First, an operator dropped isopropyl alcohol on a flat glass having the same size as a postcard. Next, the worker put a polyethylene terephthalate film on the flat glass. The polyethylene terephthalate film was Lumirror (registered trademark) T60 manufactured by Toray Industries, Inc. Next, the operator pushed out the air bubbles sandwiched between the flat glass and the polyethylene terephthalate film. When the air bubbles were pushed out, the workers applied commercially available tapes to one end and the other end of the flat glass and the polyethylene terephthalate film. Thereby, flat glass and a polyethylene terephthalate film were bonded together. The thickness of this tape was 40 micrometers. The thickness of the light scattering layer, which will be described later, is adjusted according to how many sheets of this tape are stacked. Next, the workers bonded the remaining edges of the flat glass and the polyethylene terephthalate film in the same manner. Thereby, the square edges of the flat glass and the polyethylene terephthalate film were laminated. Next, the worker dropped the paint according to this example onto a polyethylene terephthalate film to which the edges of four sides were laminated. When the paint was dripped, the worker used a straight metal cylindrical rod to spread the paint on the area of the polyethylene terephthalate film surrounded by the tape. The amount of paint was such as to be as high as the overlying tape when spread over the overlying taped area. Next, the worker dried the coated polyethylene terephthalate film and flat glass in a drying oven. The temperature in the drying oven was 120 degrees Celsius. Thereby, the paint became a light scattering layer. The thickness of the light scattering layer was 19.9 micrometers. The image display body according to this example was completed because the paint became a light scattering layer.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measures total light transmittance and haze of the image display body according to the present embodiment by using a haze meter NDH7000 of Nippon Denshoku Kogyo Co., Ltd. did. The total light transmittance measured was 35.22%. The measured haze was 99.12%.

(B) Measurement of Luminance Ratio of Reflected Light The operator measures the next luminance of the image display body according to the present embodiment by using a variable angle photometer GC-500L manufactured by Nippon Denshoku Kogyo Co., Ltd. did. The first of the luminances is a direction inclined by 60 ° as viewed from the normal direction side and from the normal direction as viewed from the normal direction of the reflected light of the light irradiated from the incident direction (see FIG. Brightness in the direction marked “−60 °”. The “incident direction” is a direction inclined 45 ° with respect to the normal direction (the direction described as “light incident (front) −45 °” in FIG. 5). The “normal direction” is the normal direction of the image display body according to the present embodiment (the direction described as “light incident (rear) normal direction 0 °” in FIG. 5). That is, the “normal direction” is a direction orthogonal to the surface of the image display body according to the present embodiment. The second luminance is a direction opposite to the incident direction as viewed from the normal direction of the reflected light and a direction inclined by 60 ° with respect to the normal direction (“60 °” in FIG. 5 Direction)). When these luminances were measured, the worker calculated the quotient by dividing the smaller one of the luminances by the larger one. The calculated quotient is the luminance ratio of the reflected light in the present embodiment. The ratio obtained as a result of the measurement was 0.570.

(C) Measurement of luminance ratio of transmitted light The operator measures the next luminance of the image display body according to the present embodiment by using a variable-angle photometer GC-500L manufactured by Nippon Denshoku Kogyo Co., Ltd. did. The first one of the luminances is a point which is described next as the origin, and when the normal direction described above when viewed from the origin is 0 °, a direction inclined 120 ° with respect to the normal direction It is the luminance described next (in the direction marked “120 °” in FIG. 5). The origin is a point where the light irradiated to the image display body from the normal direction penetrates the image display body. The luminance is the luminance of light transmitted through the image display body. The intersection of the two lines described next in FIG. 5 corresponds to the origin. The first line is a line drawn between a portion marked “light incident (rear) normal direction 0 °” and a portion marked “parallel light transmission 180 °”. The second line is a thick line following the description of "film ± 90 ° direction". The second luminance is a direction inclined by 150 ° with respect to the normal direction when the above-mentioned normal direction viewed from the above-mentioned origin is 0 ° (described as “150 °” in FIG. In the following directions): The luminance is the luminance of light passing through the image display body. When these luminances were measured, the worker calculated the quotient by dividing the smaller one of the luminances by the larger one. The calculated quotient is the luminance ratio of the transmitted light in the present embodiment. The ratio obtained as a result of the measurement was 0.682.

(D) Calculation of Parallel Ray Transmittance The operator calculated the parallel ray transmittance by substituting a value into the equation described below. The parallel light transmittance obtained as a result of calculation was 0.31%.
[Parallel light transmittance] = (100%-[haze]) × [total light transmittance]

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

Example 2
(1) Preparation of paint The preparation procedure of the paint is the same as in Example 1.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 13.3 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 47.24%. The measured haze was 98.35%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.571.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.590.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.78%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. When looking at the image appearing on the back of the image display body according to this example, the operator did not feel glare.

[Example 3]
(1) Preparation of paint In the same manner as in Example 1, the operator prepared the zirconia particle dispersion and the graphite particle dispersion. When they were adjusted, the workers mixed the zirconia particle dispersion, the graphite particle dispersion, and the acrylic rubber liquid so that the following two requirements were satisfied. The first requirement is that the mass% of the zirconia particles is 49.8 mass% with respect to the sum of the mass of the zirconia particles, the mass of the graphite particles and the mass of the acrylic rubber. The second requirement is that the mass percentage of graphite particles to the sum of zirconia particles, graphite particles and acrylic rubber is 0.41 mass%. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present example.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 19.6 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 22.84%. The measured haze was 98.73%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.452.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.632.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.29%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

Example 4
(1) Preparation of paint The preparation procedure of the paint is the same as in Example 3.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 13.1 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 34.35%. The measured haze was 97.99%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.466.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.546.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.69%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. When looking at the image appearing on the back of the image display body according to this example, the operator did not feel glare.

[Example 5]
(1) Preparation of paint In the same manner as in Example 1, the operator prepared the zirconia particle dispersion and the graphite particle dispersion. When they were adjusted, the workers mixed the zirconia particle dispersion, the graphite particle dispersion, and the acrylic rubber liquid so that the following two requirements were satisfied. The first requirement is that the mass percentage of the zirconia particles is 49.6 mass% with respect to the sum of the mass of the zirconia particles, the mass of the graphite particles and the mass of the acrylic rubber. The second requirement is that the mass% of the graphite particles to the sum of the zirconia particles, the graphite particles and the acrylic rubber is 0.83 mass%. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present example.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 19.2 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 15.48%. The measured haze was 98.64%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.340.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.644.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.21%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. However, the range in which the image can be seen on the front side is slightly narrow, and the image on the back side is slightly dark. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

[Example 6]
(1) Preparation of paint The preparation procedure of the paint is the same as in Example 5.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 12.8 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 24.08%. The measured haze was 98.17%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.355.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.562.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.44%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. However, the area where the image can be seen on the front side was slightly narrow. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

[Example 7]
(1) Preparation of paint In the same manner as in Example 1, the operator prepared the zirconia particle dispersion and the graphite particle dispersion. When they were adjusted, the workers mixed the zirconia particle dispersion, the graphite particle dispersion, and the acrylic rubber liquid so that the following two requirements were satisfied. The first requirement is that the mass% of the zirconia particles is 49.2 mass% with respect to the sum of the mass of the zirconia particles, the mass of the graphite particles and the mass of the acrylic rubber. The second requirement is that the mass percentage of the graphite particles with respect to the sum of the zirconia particles, the graphite particles and the acrylic rubber is 1.64 mass%. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present example.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 18.2 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 12.98%. The measured haze was 98.46%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.375.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.582.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.20%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. However, the range in which the image can be seen on the front side is slightly narrow, and the image on the back side is slightly dark. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

[Example 8]
(1) Preparation of paint The preparation procedure of the paint is the same as in Example 7.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 12.2 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 9.65%. The measured haze was 97.93%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.280.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.509.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.20%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. As a result of the projection, images appeared on the front and back of the image display body according to the present embodiment. The image on the back was clear. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to the present embodiment. However, the range where the image can be seen was a little narrow, and the image on the back side was a little dark. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

[Example 9]
(1) Preparation of paint In the same manner as in Example 1, the operator prepared the zirconia particle dispersion and the graphite particle dispersion. When they were adjusted, the workers mixed the zirconia particle dispersion, the graphite particle dispersion, and the acrylic rubber liquid so that the following two requirements were satisfied. The first requirement is that the mass% of the zirconia particles is 48.4 mass% with respect to the sum of the mass of the zirconia particles, the mass of the graphite particles and the mass of the acrylic rubber. The second requirement is that the mass% of the graphite particles to the sum of the zirconia particles, the graphite particles and the acrylic rubber is 3.23 mass%. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present example.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 16.7 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 10.11%. The measured haze was 98.44%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.228.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.618.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to this example in the same manner as Example 1. The parallel light transmittance obtained as a result of calculation was 0.17%.

(4) Video of Image Display Body The operator projects a moving image on the image display body according to the present embodiment. By the projection, clear images appeared on the front and back of the image display body according to the present embodiment. Those images could be seen well on the back and front as well from the direction inclined with respect to the normal direction of the image display body according to this example. However, the range in which the image can be seen on the front side is slightly narrow, and the image on the back side is slightly dark. When looking at the image appearing on the back of the image display body according to the present embodiment, the operator felt no glare at all.

Comparative Example 1
(1) Preparation of paint In the same manner as in Example 1, the operator prepared a graphite particle dispersion. Once adjusted, the workers mixed the graphite particle dispersion and the acrylic rubber liquid so that the following requirements were met. The requirement is that the mass% of the graphite particles to the sum of the mass of the graphite particles and the mass of the acrylic rubber is 4.00 mass%. The zirconia particle dispersion was not mixed in the mixed solution. Therefore, the mixed solution contains no zirconia particles. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present comparative example.

(2) Production of Image Display Body An operator produced an image display body according to the present example in the same manner as in Example 1. The thickness of the light scattering layer was 25.1 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured the total light transmittance and haze of the image display body according to the present example in the same manner as in Example 1. The total light transmittance measured was 1.8%. The measured haze was 76.67%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to this example. The luminance ratio of the measured reflected light was 0.015.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the worker measured the luminance ratio of transmitted light of the image display body according to the present example. The luminance ratio of the measured transmitted light was 0.787.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 0.42%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. The range in which the image appearing on the front side among those images was visible was narrower than those in Examples 1 to 9 described above. The image on the front side was dark as compared with Examples 1 to 9 described above. The image on the back side was particularly dark as compared to Examples 1 to 9 described above. When looking at the image appearing on the back of the image display body according to this comparative example, the operator felt no glare at all.

Comparative Example 2
(1) Preparation of paint The preparation procedure of the paint is the same as that of Comparative Example 1.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 16.7 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 4.7%. The measured haze was 68.72%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.031.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.962.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 1.47%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. The range in which the image appearing on the front side among those images was visible was narrower than those in Examples 1 to 9 described above. The image on the front side was dark as compared with Examples 1 to 9 described above. The image on the back side was particularly dark as compared to Examples 1 to 9 described above. When looking at the image appearing on the back of the image display body according to this comparative example, the operator felt a slight glare.

Comparative Example 3
(1) Preparation of paint In the same manner as Example 1, the operator prepared a zirconia particle dispersion. Once it was adjusted, the workers mixed the zirconia particle dispersion and the acrylic rubber liquid so that the following requirements were met. The requirement is that the mass% of the zirconia particles is 50.0 mass% with respect to the sum of the mass of the zirconia particles and the mass of the acrylic rubber. The graphite particle dispersion was not mixed in the mixed solution. Therefore, the mixed solution contains no graphite particles. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present comparative example.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 20.2 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 60.16%. The measured haze was 98.67%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.823.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.656.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 0.8%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the front image was not as sharp as the rear image. When looking at the image appearing on the back of the image display body according to this comparative example, the operator did not feel glare.

Comparative Example 4
(1) Preparation of paint The preparation procedure of the paint is the same as in Comparative Example 3.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 13.4 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 66.33%. The measured haze was 97.09%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.862.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.576.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 1.93%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the front image was not as sharp as the rear image. When looking at the image appearing on the back of the image display body according to this comparative example, the operator felt a slight glare.

Comparative Example 5
(1) Preparation of paint The preparation procedure of the paint is the same as in Comparative Example 3.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 6.7 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 71.7%. The measured haze was 94.64%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.598.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.498.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 3.84%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. The range in which the image appearing on the back side among those images was visible was narrower than those in Examples 1 to 9 described above. Among the images, the front image was not as sharp as the rear image. When looking at the image appearing on the back of the image display body according to this comparative example, the operator felt glare.

Comparative Example 6
(1) Preparation of paint In the same manner as Example 1, the operator prepared a zirconia particle dispersion. Once it was adjusted, the workers mixed the zirconia particle dispersion and the acrylic rubber liquid so that the following requirements were met. The requirement is that the mass% of the zirconia particles with respect to the sum of the mass of the zirconia particles and the mass of the acrylic rubber is 33.3 mass%. The graphite particle dispersion was not mixed in the mixed solution. Therefore, the mixed solution contains no graphite particles. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present comparative example.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 24.1 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 62.32%. The measured haze was 99.09%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.887.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.697.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 0.57%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the front image was not as sharp as the rear image. When looking at the image appearing on the back of the image display body according to this comparative example, the operator did not feel glare.

Comparative Example 7
(1) Preparation of paint The preparation procedure of the paint is the same as in Comparative Example 6.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 16.1 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 63.73%. The measured haze was 99.01%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.952.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.659.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 0.63%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the front image was not as sharp as the rear image. When looking at the image appearing on the back of the image display body according to this comparative example, the operator did not feel glare.

Comparative Example 8
(1) Preparation of paint The preparation procedure of the paint is the same as in Comparative Example 6.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 8.0 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 71.94%. The measured haze was 97.78%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.679.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.458.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 1.60%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. The range in which the image appearing on the back side among those images was visible was narrower than those in Examples 1 to 9 described above. Among the images, the front image was not as sharp as the rear image. When looking at the image appearing on the back of the image display body according to this comparative example, the operator felt a slight glare.

Comparative Example 9
(1) Preparation of paint In the same manner as Example 1, the operator prepared a zirconia particle dispersion. Once it was adjusted, the workers mixed the zirconia particle dispersion and the acrylic rubber liquid so that the following requirements were met. The requirement is that the mass% of the zirconia particles is 20.0 mass% with respect to the sum of the mass of the zirconia particles and the mass of the acrylic rubber. The graphite particle dispersion was not mixed in the mixed solution. Therefore, the mixed solution contains no graphite particles. The other points are the same as in the first embodiment. The liquid thus mixed is the paint according to the present comparative example.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 27.1 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 80.08%. The measured haze was 71.68%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.473.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.576.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 22.68%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the image on the back side was not as sharp as the image on the front side. When looking at the image appearing on the back of the image display body according to this comparative example, the worker felt a strong glare.

Comparative Example 10
(1) Preparation of paint The preparation procedure of the paint is the same as in Comparative Example 9.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 18.1 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 81.67%. The measured haze was 71.72%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.452.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.511.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 23.1%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the image on the back side was not as sharp as the image on the front side. When looking at the image appearing on the back of the image display body according to this comparative example, the worker felt a strong glare.

Comparative Example 11
(1) Preparation of paint The preparation procedure of the paint is the same as in Comparative Example 9.

(2) Production of Image Display Body An operator produced an image display body according to the present comparative example in the same manner as in Example 1. The thickness of the light scattering layer was 9.0 micrometers.

(3) Measurement (A) Measurement of total light transmittance and haze The operator measured total light transmittance and haze of the image display body according to the present comparative example in the same manner as Example 1. The total light transmittance measured was 83.6%. The measured haze was 69.38%.

(B) Measurement of Luminance Ratio of Reflected Light In the same manner as in Example 1, the worker measured the luminance ratio of the reflected light of the image display body according to the present comparative example. The luminance ratio of the measured reflected light was 0.409.

(C) Measurement of Luminance Ratio of Transmitted Light In the same manner as in Example 1, the operator measured the luminance ratio of the transmitted light of the image display body according to the present comparative example. The luminance ratio of the measured transmitted light was 0.511.

(D) Calculation of Parallel Light Transmittance The operator calculated the parallel light transmittance according to the present comparative example in the same manner as in Example 1. The parallel light transmittance obtained as a result of calculation was 25.6%.

(4) Video of Image Display Body The operator projected a moving image on the image display body according to the present comparative example. As a result of the projection, images appeared on the front and back of the image display body according to this comparative example. Among the images, the image on the back side was not as sharp as the image on the front side. When looking at the image appearing on the back of the image display body according to this comparative example, the worker felt a strong glare.

[Description of the effect of the image display body according to the embodiment]
FIG. 1 is a view showing the influence of mass% of graphite particles on the total light transmittance in Examples and Comparative Examples of the present embodiment. In FIG. 1, the total light transmittance changes according to the mass% of the graphite particles. The influence of the mass percentage of the graphite particles on the total light transmittance is large.

  FIG. 2 is a view showing the influence of the mass% of the zirconia particles on the total light transmittance in the comparative example. The comparative example whose total light transmittance is shown in FIG. 2 does not contain any graphite particles. In FIG. 2, the total light transmittance changes according to the mass% of the zirconia particles. However, the effect of the% by mass of the zirconia particles on the total light transmittance is smaller than that of the% by mass of the graphite particles.

  FIG. 3 is a view showing the influence of the thickness of the light scattering layer on the total light transmittance in the comparative example. The comparative example whose total light transmittance is shown in FIG. 3 does not contain any graphite particles. In FIG. 3, the marks of the comparative example having the same mass% of zirconia particles are connected by a line. In FIG. 3, the total light transmittance changes in accordance with the thickness of the light scattering layer. However, the effect of the thickness of the light scattering layer on the total light transmittance is smaller than that of the mass% of the graphite particles. The effect of the thickness of the light scattering layer on the total light transmittance is smaller than that of the mass percentage of the zirconia particles.

  According to FIGS. 1 to 3, the mass% of the graphite particles has a large effect on the total light transmittance as compared to the mass% of the zirconia particles and the thickness of the light scattering layer. Since the mass% of the graphite particles has a large effect on the total light transmittance, the total light transmittance can be improved by including the graphite particles in addition to the zirconia particles, as compared to the case where only the zirconia particles are included in the light scattering layer. The setting of is easy.

  FIG. 4 is a view showing the influence of the mass% of the zirconia particles on the haze in the comparative example. The comparative examples of which the haze is shown in FIG. 4 do not contain any graphite particles. According to FIG. 4, the% by mass of the zirconia particles affects the haze. That is, by including zirconia particles in the light scattering layer, it becomes possible to set the haze. Thereby, the degree of freedom in setting of the total light transmittance and the haze of the image display body can be improved by including the graphite particles in addition to the zirconia particles.

  Further, according to the example of the present embodiment, the mass percentage of the zirconia particles to the mass sum is 20% or more, and the mass percentage of the graphite particles to the mass sum is 0.2% or more. It became difficult to feel glare when looking at the image appearing on the back. Also, the images appearing on the front and back of the image display were sharp.

Claims (8)

Zirconia particles,
Solvent,
A transmission layer forming material that forms a transmission layer through which light can be transmitted when the solvent vaporizes;
Containing graphite particles,
The mass% of the zirconia particles is 20% or more based on the mass sum which is the sum of the mass of the zirconia particles, the mass of the graphite particles, and the mass of the permeable layer-forming material,
The mass% of the graphite particles with respect to the mass sum is 0.2% or more,
A paint for forming an image display body, wherein the sum of the mass% of the zirconia particles to the mass sum and the mass% of the graphite particles to the mass sum is less than 100%.   The paint for forming an image display body according to claim 1, wherein a mass% of the graphite particles to the mass sum is 0.2% or more and 1.64% or less.   The paint for forming an image display body according to claim 2, wherein a mass% of the graphite particles to the mass sum is 0.2% or more and 0.41% or less.   The paint for forming an image display body according to claim 1, wherein a mass% of the zirconia particles with respect to the mass sum is 25% or more.   The paint for forming an image display body according to claim 1, wherein a mass% of the graphite particles to the mass sum is 0.83% or more. An image display body, which is an object for displaying an image, comprising a light scattering layer that scatters the light when it is incident,
The light scattering layer is
Zirconia particles,
A transmission layer forming material for forming a transmission layer capable of transmitting the light
Containing graphite particles,
The mass% of the zirconia particles is 20% or more based on the mass sum which is the sum of the mass of the zirconia particles, the mass of the graphite particles, and the mass of the permeable layer-forming material,
The mass% of the graphite particles with respect to the mass sum is 0.2% or more,
The image display is characterized in that the sum of the mass% of the zirconia particles to the mass sum, the mass% of the graphite particles to the mass sum, and the mass% of the transmission layer forming material to the mass sum is 100% or less body. The total light transmittance of the image display body is 60% or less,
The image display body according to claim 6, wherein the haze of the image display body is 97% or more. The reflected light of the light emitted from the incident direction, which is a direction inclined 45 ° with respect to the normal direction of the image display, is the incident direction side seen from the normal direction and 60 relative to the normal direction. The smaller of the luminance of the reflected light in the direction inclined by ° and the luminance of the reflected light in the direction opposite to the incident direction when viewed from the normal direction and inclined by 60 ° with respect to the normal direction The luminance ratio of the reflected light which is a quotient calculated by dividing the luminance of the reflected light by the luminance of the larger reflected light is 0.2 or more.
When the light irradiated to the image display body from the normal direction of the image display body penetrates the image display body as an origin, and the normal direction viewed from the origin is 0 ° The brightness of the light transmitted through the image display body in a direction inclined 120 ° with respect to the normal direction as viewed from the origin and the image display body in a direction inclined 150 ° with respect to the normal direction as viewed from the origin The luminance ratio of the transmitted light, which is a quotient calculated by dividing the luminance of the smaller one of the luminance of the light transmitted through the light by the luminance of the larger one, is 0.5 or more The image display body of Claim 6 characterized by the above-mentioned.

Images