Printed materials, display devices, and structures

Abstract

To provide printed materials, display devices, and structures that allow for easy printing of the image portion while preventing a decrease in visibility. [Solution] A printed material 1 according to one embodiment comprises a transparent substrate 2 having an easy-adhesion treatment applied to at least one side, a pattern printing layer 5 facing the easily-adhesion treated side of the transparent substrate 2, and a surface protection layer 7 located on the opposite side of the pattern printing layer 5 from the transparent substrate 2 and made of a transparent resin material. The pattern printing layer 5 has a transparent portion 5b that transmits light L along the thickness direction D1 of the pattern printing layer 5, and the surface protection layer 7 covers the surface portion 2b of the transparent substrate 2 exposed in the transparent portion 5b, and the pattern printing layer 5.

Description

Technical Field

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[0001] The present disclosure relates to printed matter, display devices, and structures.

Background Art

[0002] Patent Document 1 describes a decorative sheet and a display device. The decorative sheet has a base material portion, a pattern portion provided on the base material portion, and a plurality of transmission portions that are non-formation portions of the pattern portion. The aperture ratio of the decorative sheet by the transmission portions is 5% or more and 50% or less. The transmission portions are formed such that the distance between adjacent transmission portions is 40 μm or more and 140 μm or less. The transmission portions are formed of a transparent resin having a refractive index within ±0.2 of the refractive index of the base material portion. The transmission portions function as a transparent protective film for protecting the pattern portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in printed matter, there are cases where a pattern portion cannot be easily printed on a transparent base material. As the above-described method for forming the transmission portions, fine hole drilling by laser processing is adopted, and in some cases, the transmission portions are formed by the laser light cutting the pattern portion. However, in laser processing, it may be difficult to form the transmission portions by cutting only the pattern portion, and there is a possibility that the surface of the base material may be damaged by the laser light. If the surface of the base material is damaged, there is a concern that the visibility of the image may be reduced due to the refraction of light by the damage. Furthermore, when providing a protective film for protecting the pattern portion, it is assumed that the transparency is reduced by the protective film and the visibility is reduced.

[0005] The purpose of this disclosure is to provide printed materials, display devices, and structures that allow for easy printing of image-printed areas and prevent a decrease in visibility. [Means for solving the problem]

[0006] (1) The printed material relating to this disclosure is light-transmitting. The printed material comprises a transparent substrate having an easy-adhesion treatment on at least one side, a pattern printing layer facing the easily-adhesion treated side of the transparent substrate, and a surface protection layer located on the opposite side of the pattern printing layer from the transparent substrate and composed of a transparent resin material. The pattern printing layer has a light-transmitting portion along the thickness direction of the pattern printing layer, and the surface protection layer covers the surface portion of the transparent substrate exposed in the light-transmitting portion and the pattern printing layer.

[0007] This printed material comprises a transparent substrate, a pattern printing layer, and a surface protection layer, with the transparent substrate being treated for easy adhesion. Therefore, the pattern printing layer can be easily printed onto the transparent substrate. The pattern printing layer has light-transmitting portions along its thickness, and the surface portion of the transparent substrate is exposed in these portions. The surface protection layer covers the surface portion exposed in the light-transmitting portions and the pattern printing layer. Therefore, even if the surface portion of the transparent substrate is scratched by laser light when the pattern printing layer is irradiated with laser light and a light-transmitting portion is formed in the pattern printing layer, the surface protection layer is formed on the surface portion of the transparent substrate, suppressing the refraction of light due to the scratch. Therefore, a decrease in image visibility can be suppressed. Furthermore, since the surface protection layer is made of a transparent resin material, a decrease in transparency due to the surface protection layer can be prevented, thereby improving visibility.

[0008] (2) In (1) above, when T1 is the transmittance of visible light passing through the transparent substrate and T2 is the transmittance of visible light passing through the transparent substrate and the surface protective layer, T1 ≤ T2 may be satisfied. In this case, the transmittance of visible light can be increased by forming the surface protective layer, which contributes to further improvement of visibility.

[0009] (3) In (1) or (2) above, the thickness of the surface protective layer may be 5 μm or more and 100 μm or less. In this case, a surface protective layer thickness of 5 μm or more ensures that the pattern printing layer is reliably covered by the surface protective layer. A surface protective layer thickness of 100 μm or less prevents the occurrence of distortion and warping in the printed material.

[0010] (4) In any of (1) to (3) above, the surface protective layer may be made of an acrylic resin. In this case, the transparency can be further enhanced by making the surface protective layer of a highly transparent acrylic resin.

[0011] (5) The display device relating to this disclosure comprises the aforementioned printed material and a light source. Since this display device comprises the aforementioned printed material, it produces the same effects as described above.

[0012] (6) The structure relating to this disclosure comprises the aforementioned printed material and a solar panel facing the side of the transparent substrate of the printed material that is opposite to the pattern printing layer. Since this structure comprises the aforementioned printed material, it provides the same effects as described above. Furthermore, since this structure comprises a solar panel, it can generate electricity using transmitted light that passes through the printed material. [Effects of the Invention]

[0013] According to this disclosure, the image printing area can be easily printed while preventing a decrease in visibility. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a schematic diagram showing the layer structure of the display device and printed material according to the embodiment. [Figure 2] Figure 2 is a schematic plan view showing a printed material according to an embodiment. [Figure 3] Figure 3 shows the steps of the manufacturing method for printed materials according to an embodiment. [Figure 4]Figure 4 is a schematic diagram showing a structure according to the embodiment. [Modes for carrying out the invention]

[0015] The embodiments of the printed materials, display devices, and structures relating to this disclosure will be described below with reference to the drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. For the sake of ease of understanding, some parts of the drawings may be simplified or exaggerated, and the dimensional ratios, etc., are not limited to those shown in the drawings.

[0016] Figure 1 is a schematic cross-sectional view showing the display device 20 according to this embodiment. As shown in Figure 1, the display device 20 comprises a printed material 1 and a light source 21. The display device 20 is, for example, a display device with a panel equipped with a decorative sheet. The printed material 1 is a decorative sheet for representing a pattern. The printed material 1 comprises, for example, a transparent substrate 2, an opaque solid layer 3, and a pattern printing layer 5.

[0017] The printed material 1 is placed in front of the light source 21 (on the near side, between the viewer and the light source 21). The printed material 1 transmits light L from the light source 21. The printed material 1 has, for example, total light transmittance. When the power to the light source 21 is ON (the light source 21 is emitting light L), the viewer can see the light from the light source 21 that has passed through the printed material 1. When the power to the light source 21 is OFF (the light source 21 is not emitting light), the viewer can see the image represented by the printed material 1.

[0018] The light source 21 is, for example, a display device. In this case, the light source 21 is a display constituted by a dot matrix method, a liquid crystal method, a plasma method, or an organic EL. For example, the total light transmittance of the printed matter 1 is 30% or more and 70% or less. The visible light transmittance of the printed matter 1 may be 10% or more and 70% or less. When the visible light transmittance of the printed matter 1 is 10% or more, the light from the light source 21 can be easily passed through the printed matter 1. The transmittance is, for example, a value measured using a spectrophotometer (as an example, spectrophotometer UV-2100 manufactured by Shimadzu Corporation).

[0019] The transparent base material 2 is a base material having visible light transmittance. The transparent base material 2 is constituted by a resin having transmittance. The transparent base material 2 is, for example, transparent or translucent. The resin having transmittance is, for example, polystyrene, AS, ABS, polyvinyl chloride, acrylic, polyethylene, polypropylene, polycarbonate, polyacrylonitrile, or nylon. The transparent base material 2 may be a transferable base material. The transparent base material 2 may be a glass base material. The thickness of the transparent base material 2 is, for example, 25 μm or more and 250 μm or less. When the transparent base material 2 is a glass substrate, the thickness of the transparent base material 2 is, for example, 1 mm or more and 10 mm or less.

[0020] The transparent base material 2 may be constituted by polyethylene terephthalate (PET). When the transparent base material 2 is constituted by PET, for example, due to crystallization accompanying biaxial stretching, there may be a problem that it is difficult to attach the pattern printing layer 5 to the transparent base material 2. Therefore, the transparent base material 2 is subjected to an easy adhesion treatment on at least one side. The easy adhesion treatment is a treatment for enhancing the adhesion of the pattern printing layer 5 to the transparent base material 2. By the easy adhesion treatment, the pattern printing layer 5 can be easily printed on the transparent base material 2. The transparent base material 2 may be an easy adhesion PET film.

[0021] The transparent substrate 2 may have an easy - adhesion layer which is a layer formed by subjecting to an easy - adhesion treatment. The easy - adhesion layer contains, for example, an amorphous linear saturated polyester resin. The amorphous linear saturated polyester resin is, for example, linear and thermoplastic. The amorphous linear saturated polyester resin may contain a copolymer composed of terephthalic acid, isophthalic acid, ethylene glycol, neopentyl glycol, or a combination thereof.

[0022] The transparent substrate 2 may be produced by stretching a uniaxially stretched PET film. In this case, for example, it is stretched at a temperature of 78 °C or higher and 100 °C or lower, and the stretching ratio is 2 times or more and 4 times or less. For example, a composition containing an organic titanate and a fixing polymer, which becomes an easy - adhesion layer, is laminated on one or both sides of the uniaxially stretched PET film. At this time, the composition is laminated on the uniaxially stretched PET film by a melt - extrusion method or a solution - coating method. Then, the transparent substrate 2 may be produced by stretching the uniaxially stretched film in a direction perpendicular to the stretching direction. For example, by laminating and stretching the composition on the PET film, the transparent substrate 2 provided with an easy - adhesion layer is produced.

[0023] A concealing solid layer 3 is provided on the transparent substrate 2. The concealing solid layer 3 contacts, for example, the surface of the transparent substrate 2 subjected to the easy - adhesion treatment. The concealing solid layer 3 is a layer that conceals the light source 21 and determines the hue of the pattern when the power of the light source 21 is OFF. The concealing solid layer 3 contains at least one of an inorganic pigment and an organic pigment. As an example, the thickness of the concealing solid layer 3 is 2 μm. The concealing solid layer 3 is, for example, one used in a normal transfer method. The concealing solid layer 3 has concealability. That is, the concealing solid layer 3 has a concealing function.

[0024] The opaque solid layer 3 includes at least one of an acrylic material, a chlorinated rubber material, a vinyl chloride material, a vinyl acetate material, a vinyl chloride-vinyl acetate copolymer material, a urethane material, and a polyester material. The opaque solid layer 3 may be composed of, for example, at least one of a solid ink layer and a vapor-deposited layer. The opaque solid layer 3 may have a structure in which the vapor-deposited layer is sandwiched between a pair of solid ink layers.

[0025] The pattern printing layer 5 is formed, for example, on the side opposite to the transparent substrate 2 in the opaque solid layer 3. The pattern printing layer 5 faces the surface of the transparent substrate 2 that has been treated for easy adhesion. The pattern printing layer 5 is the layer that expresses the pattern of the printed material 1. That is, the pattern printing layer 5 is the layer on which the pattern expressed by the printed material 1 is formed. The pattern on the pattern printing layer 5 is the pattern that appears on the surface of the printed material 1 when the power to the light source 21 is OFF, and is, for example, a wood grain pattern, a stone pattern, or an abstract pattern.

[0026] The pattern printing layer 5 is applied to the opacity solid layer 3 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. The pattern printing layer 5 may contain, for example, interference pigments. The thickness of the pattern printing layer 5 is, for example, 2 μm. The pattern printing layer 5 may contain a curing agent. In this case, the heat resistance and adhesion of the pattern printing layer 5 can be improved.

[0027] Figure 2 is a plan view of the printed material 1 as seen along the thickness direction D1. As shown in Figures 1 and 2, the pattern printing layer 5 has a translucent portion 5b that transmits light from the light source 21 along the thickness direction D1 of the pattern printing layer 5. The printed material 1 has a surface protection layer 7, which is applied to the translucent portion 5b. The surface protection layer 7 is located on the opposite side of the pattern printing layer 5 from the transparent substrate 2. For example, the thickness of the surface protection layer 7 is 5 μm or more and 100 μm or less.

[0028] The surface protection layer 7 is made of a transparent resin material. The surface protection layer 7 is made of an acrylic resin. The surface protection layer 7 is made of a material that mainly contains acrylic resin. Examples of acrylic resins include polymethyl methacrylate resin (PMMA). One type of acrylic resin may be used alone, or two or more types may be used in combination.

[0029] For example, the surface protection layer 7 is applied to the pattern printing layer 5 so as to fill the transparent portion 5b and cover the surface 5c of the pattern printing layer 5 opposite to the transparent substrate 2. In Figure 2, to avoid complexity, parts other than the surface protection layer 7 that fills the transparent portion 5b (the resin covering surface 5c) are omitted from the illustration. The surface protection layer 7 is, for example, a transparent resin that is viscous when applied and hardens over time. The surface protection layer 7 may be in liquid form when applied, or it may be applied so that the liquid surface protection layer 7 is embedded in the transparent portion 5b.

[0030] For example, the pattern printing layer 5 has a plurality of transparent portions 5b arranged along the in-plane direction of the pattern printing layer 5. The in-plane direction of the pattern printing layer 5 includes, for example, a first direction D2 and a second direction D3 that intersects (for example, orthogonal to) the thickness direction D1 and the first direction D2. The plurality of transparent portions 5b are arranged at equal intervals along the in-plane direction of the pattern printing layer 5. For example, the plurality of transparent portions 5b are arranged in a grid. For example, the transparent portions 5b are circular in shape. However, the shape of the transparent portions 5b may be other than circular, for example, an oval shape including an ellipse, a polygon including a triangular, square, or hexagon, or a fan shape. Thus, the shape of the transparent portions 5b is not particularly limited.

[0031] The ratio of the area of ​​the transparent portion 5b to the area of ​​the pattern printing layer 5 as viewed along the thickness direction D1 (aperture ratio) is, for example, 10% or more and 70% or less. An aperture ratio of 10% or more allows light L from the light source 21 to pass through the pattern printing layer 5, so the image from the light source 21 can be clearly displayed when the light source 21 is powered on. An aperture ratio of 70% or less allows light from the opposite side of the light source 21 to be reflected by the pattern printing layer 5, so the pattern on the pattern printing layer 5 can be clearly displayed when the light source 21 is powered off.

[0032] The transparent portion 5b is open in the pattern printing layer 5. The transparent portion 5b penetrates the pattern printing layer 5 in the thickness direction D1. For example, the transparent portion 5b penetrates both the opaque solid layer 3 and the pattern printing layer 5 in the thickness direction D1. For example, the transparent portion 5b is formed by irradiation with laser light. The transparent portion 5b is formed by micro-hole drilling using laser light irradiation. Micro-hole drilling enables precise processing, allowing for hole drilling to depths of tens to hundreds of micrometers.

[0033] In micro-hole drilling using laser light irradiation, it is difficult to remove only the pattern printing layer 5 (or only the pattern printing layer 5 and the opaque solid layer 3), and the surface portion 2b of the transparent substrate 2 may also be removed. In this case, the surface portion 2b may be scratched. The surface portion 2b of the transparent substrate 2 is the part of the transparent substrate 2 that is exposed in the transparent portion 5b. If the surface portion 2b is scratched, the light L from the light source 21 that passes through the transparent portion 5b may be refracted at the scratch. When the light L from the light source 21 is refracted at the scratch, diffuse reflection of light may occur, which may cause a cloudy appearance in the image from the light source 21 and reduce the visibility of the image.

[0034] In this embodiment, a surface protection layer 7 is formed on the surface portion 2b of the transparent substrate 2 that is exposed in the transparent portion 5b. The surface protection layer 7 covers the surface portion 2b of the transparent substrate 2 that is exposed in the transparent portion 5b, and the pattern printing layer 5. The surface protection layer 7 is formed to fill the transparent portion 5b and to cover the surface 5c of the pattern printing layer 5 that is opposite to the transparent substrate 2. The surface protection layer 7 is formed, for example, by coating to cover scratches formed on the surface portion 2b of the transparent substrate 2.

[0035] The surface protection layer 7 is made of a material whose refractive index is close to that of the transparent substrate 2. In this case, the surface protection layer 7 is formed to cover scratches formed on the surface portion 2b, thereby reducing the refraction of light at these scratches. As a result, diffuse reflection of light L from the light source 21 is suppressed, reducing the cloudiness of the image. Consequently, the visibility of the image due to illumination by light L from the light source 21 can be improved.

[0036] For example, if T1 is the transmittance of visible light passing through the transparent substrate 2, and T2 is the transmittance of visible light passing through the transparent substrate 2 and the surface protective layer 7, then T1 ≤ T2 is satisfied. In this case, the transmittance of visible light is higher compared to when the surface protective layer 7 is not formed, due to the formation of the surface protective layer 7 on the transparent substrate 2. For example, the surface protective layer 7 is composed of an acrylic resin that increases the transmittance of visible light in the transparent substrate 2.

[0037] Next, an example of the steps for manufacturing a printed material according to the embodiment will be described. Below, the method for manufacturing the printed material 1 described above will be explained. First, as shown in Figure 3, the opacity solid layer 3 and the pattern printing layer 5 are laminated onto the transparent substrate 2 (step of laminating the pattern printing layer). In this embodiment, the transparent substrate 2, the opacity solid layer 3, and the pattern printing layer 5 are laminated in this order.

[0038] Next, the pattern printing layer 5 is irradiated with laser light to form a transparent portion 5b in the pattern printing layer 5 (step for forming a transparent portion). At this time, a transparent portion 5b that transmits light L from the light source 21 is formed in the pattern printing layer 5 by laser processing along the thickness direction D1 of the pattern printing layer 5. For example, the transparent portion 5b is formed by irradiating the pattern printing layer 5 with ultraviolet laser light and erasing the pattern printing layer 5. As an example, the pattern printing layer 5 is irradiated with ultraviolet laser light in a spiral shape to form a circular transparent portion 5b.

[0039] After forming the transparent portion 5b, a transparent resin material that will become the surface protective layer 7 is applied to the surface portion 2b of the transparent substrate 2 exposed in the transparent portion 5b (step of applying transparent resin material). At this time, the transparent resin material is applied to fill the transparent portion 5b with the transparent resin material and to cover the surface 5c of the pattern printing layer 5, thereby forming the surface protective layer 7. After these steps, the series of steps for manufacturing the printed material 1 is completed.

[0040] Next, a structure 100 according to the embodiment will be described with reference to Figure 4. The structure 100 is equipped with a solar panel 101 instead of a light source 21. In the structure 100, the printed material 1 and the solar panel 101 are arranged along the thickness direction D1 of the printed material 1. The solar panel 101 is positioned opposite the transparent substrate 2 of the printed material 1. Sunlight H is irradiated onto the printed material 1, and the printed material 1 transmits the sunlight H. The sunlight H that has passed through the printed material 1 is irradiated onto the solar panel 101. The sunlight H that has passed through the surface protective layer 7 filled in the transparent portion 5b and the transparent substrate 2 is irradiated onto the solar panel 101.

[0041] Next, the effects and benefits obtained from the printed material 1, display device 20, and structure 100 according to this embodiment will be explained. The printed material 1 comprises a transparent substrate 2, a pattern printing layer 5, and a surface protection layer 7, and the transparent substrate 2 is treated for easy adhesion. Therefore, the pattern printing layer 5 can be easily printed onto the transparent substrate 2. The pattern printing layer 5 has a transparent portion 5b that transmits light along the thickness direction D1 of the pattern printing layer 5, and the surface portion 2b of the transparent substrate 2 is exposed in the transparent portion 5b. The surface protection layer 7 covers the surface portion 2b exposed in the transparent portion 5b and the pattern printing layer 5. Therefore, even if the surface portion 2b of the transparent substrate 2 is scratched by the laser light when the pattern printing layer 5 is irradiated with laser light and the transparent portion 5b is formed in the pattern printing layer 5, the refraction of light due to the scratch can be suppressed because the surface protection layer 7 is formed on the surface portion 2b of the transparent substrate 2. Therefore, a decrease in the visibility of the image can be suppressed. In addition, the formation of the scratch has the effect of improving the adhesion of the surface protection layer 7, which is made of transparent resin, to the transparent substrate 2. Furthermore, since the surface protective layer 7 is made of a transparent resin material, the transparency is prevented from decreasing by the surface protective layer 7, thereby improving visibility.

[0042] As mentioned above, when T1 is the transmittance of visible light passing through the transparent substrate 2 and T2 is the transmittance of visible light passing through the transparent substrate 2 and the surface protective layer 7, T1 ≤ T2 may be satisfied. In this case, the transmittance of visible light can be increased by forming the surface protective layer 7, which contributes to further improvement of visibility.

[0043] As mentioned above, the thickness of the surface protective layer 7 may be 5 μm or more and 100 μm or less. In this case, if the thickness of the surface protective layer 7 is 5 μm or more, the surface protective layer 7 can reliably cover the pattern printing layer 5. If the thickness of the surface protective layer 7 is 100 μm or less, the occurrence of distortion and warping in the printed material 1 can be prevented.

[0044] As mentioned above, the surface protective layer 7 may be made of an acrylic resin. In this case, the transparency can be further enhanced by making the surface protective layer 7 of a highly transparent acrylic resin.

[0045] The display device 20 comprises the aforementioned printed material 1 and a light source 21. Since the display device 20 comprises the aforementioned printed material 1, it produces the same effects as described above. The structure 100 comprises the aforementioned printed material 1 and a solar panel 101 facing the side of the transparent substrate 2 of the printed material 1 that is opposite to the pattern printing layer 5. Since the structure 100 comprises the aforementioned printed material 1, it produces the same effects as described above. Furthermore, since the structure 100 comprises a solar panel 101, it can display the pattern of the pattern printing layer 5 and generate electricity using sunlight H that passes through the printed material 1.

[0046] Next, examples of printed materials relating to this disclosure will be described. However, the present invention is not limited to the following examples. In the experiments relating to the examples, transparency was evaluated for printed materials relating to Examples 1 and 2, and comparative examples 1 and 2. (Example 1) A transparent PET substrate 2 with a thickness of 50 μm that had been treated for easy adhesion was coated with a bar coater to reduce its thickness to 30 μm, and an acrylic resin was applied to this transparent substrate 2 as a surface protective layer 7. (Example 2) A transparent PET substrate 2 with a thickness of 50 μm that had been treated for easy adhesion was coated to a thickness of 30 μm using a bar coater. After scratching the surface portion 2b of the transparent substrate 2 with sandpaper, an acrylic resin was applied to the transparent substrate 2 as a surface protective layer 7. (Comparative Example 1) A transparent PET substrate 2 with a thickness of 50 μm that has been treated for easy adhesion was coated with a bar coater to reduce its thickness to 30 μm, and the structure does not have a surface protective layer 7. (Comparative Example 2) A transparent PET substrate 2 with a thickness of 50 μm that has been treated for easy adhesion was coated to a thickness of 30 μm using a bar coater, and the surface portion 2b of the transparent substrate 2 was scratched with sandpaper, resulting in a configuration without a surface protective layer 7.

[0047] For each of the printed materials described in Examples 1 and 2, and for each of the printed materials described in Comparative Examples 1 and 2, the transmittance was measured at 2nm intervals between wavelengths of 360nm and 830nm using a Shimadzu UV3600i PLUS. The same portion of each printed material was measured three times, and the average value was calculated. The results are shown in Table 1 below. [Table 1]

[0048] As shown in Table 1, in a comparison between Example 1 and Comparative Example 1, where the surface portion 2b was not scratched, it was found that Example 1, which had the surface protective layer 7, obtained a higher transmittance. In a comparison between Example 2 and Comparative Example 2, where the surface portion 2b was scratched, it was also found that Example 2, which had the surface protective layer 7, obtained a higher transmittance.

[0049] The print materials according to Example 1 and Comparative Example 1 were evaluated for their legibility. In the legibility evaluation, a video was displayed on a smartphone, and each print material was superimposed on the video. Five observers a-e were asked to visually evaluate the video's legibility. The straight-line distance from the smartphone to each observer's eye was set at 30 cm. Based on the evaluation results, observers a-e were asked to select from the following A, B, and C. A: I feel that it looks almost the same whether there is a printed document or not. B: When there is printed material, it feels slightly harder to see than when there isn't. C: I feel that the image is significantly harder to see when there is a printed document compared to when there isn't. [Table 2] As shown in Table 2, it was found that in Example 1, which has a surface protective layer 7 made of acrylic resin, visibility can be improved compared to Comparative Example 1, which does not have a surface protective layer 7.

[0050] Scratch resistance tests and stain resistance tests were performed on the printed materials according to Example 3 and Comparative Example 3 below. (Example 3) A transparent PET substrate 2 with a thickness of 50 μm, which had been treated for easy adhesion, was printed with an opaque solid layer 3 and a pattern printing layer 5 on one side. Then, multiple transparent areas 5b with a diameter of 80 μm were formed by laser processing. The spacing between the transparent areas 5b was 150 μm. Furthermore, a surface protection layer 7, which is an acrylic resin-based coating agent, was coated onto the pattern printing layer 5 and the surface portion 2b of the transparent substrate 2. The thickness of the surface protection layer 7 was 30 μm. (Comparative Example 3) A transparent PET substrate 2 with a thickness of 50 μm, which had been treated for easy adhesion, was printed with an opaque solid layer 3 and a pattern printing layer 5 on one side. Then, multiple transparent areas 5b with a diameter of 80 μm were formed by laser processing. The spacing between the transparent areas 5b was 150 μm. This differs from Example 3 in that a surface protective layer 7 was not coated.

[0051] In the scratch resistance test, sandpaper was attached to the friction element of the Japan Society for the Promotion of Science (JSPS) abrasion testing machine using double-sided tape, and each printed material of Example 3 and Comparative Example 3 was rubbed back and forth five times with the sandpaper. After that, the pattern printing layer 5 was visually observed, and either A or B below was selected. A: Visual inspection revealed absolutely no effect on the pattern printing layer 5. B: Visual inspection revealed that the image printing layer 5 was affected, resulting in defects such as chipping or missing parts in the image.

[0052] In the stain resistance test, black marker, blue ink, red crayon, coffee, and soy sauce were used as stain sources. Lines approximately 5 mm wide were drawn on the pattern printing layer 5 of each printed material with the black marker and red crayon. Blue ink, coffee, and soy sauce were dropped onto the pattern printing layer 5 of each printed material and covered with a watch glass. Each stain source was left for 24 hours, after which the stain source was removed using 99% ethyl alcohol or distilled water and a neutral detergent. The degree of removal was visually observed, and one of the following A, B, or C was selected. A: The sources of contamination have been almost completely removed, and there are no defects such as pattern fading or blurring in the printed material. B: Some of the contamination source remains. Or, there are defects in the printed material such as pattern fading or blurring. C: The source of contamination has not been removed.

[0053] The results of the scratch resistance and stain resistance tests described above are shown in Table 3 below. [Table 3] As shown in Table 3, the printed material according to Example 3, which has a surface protective layer 7, was found to have higher scratch resistance and higher stain resistance compared to the printed material according to Comparative Example 3, which does not have a surface protective layer 7. From the above, it was found that printed materials with a surface protective layer 7 can have improved scratch resistance and stain resistance.

[0054] The embodiments and examples of the printed materials, display devices, and structures relating to this disclosure have been described above. However, the printed materials, display devices, and structures relating to this disclosure are not limited to the embodiments or examples described above, and may be further modified without departing from the gist of the claims. That is, the shape, size, material, number, and arrangement of each part of the printed materials, display devices, and structures relating to this disclosure can be appropriately changed within the scope of the gist described above. [Explanation of Symbols]

[0055] 1...Printed material, 2...Transparent substrate, 2b...Surface portion, 3...Opaque solid layer, 5...Pattern printing layer, 5b...Transparent portion, 5c...Surface, 7...Surface protective layer, 20...Display device, 21...Light source, 100...Structure, 101...Solar panel, D1...Thickness direction, D2...First direction, D3...Second direction, H...Sunlight, L...Light.

Claims

1. A light-transmitting printed material, A transparent substrate having an easy-adhesion treatment applied to at least one side, A pattern printing layer facing the surface of the transparent substrate that has been treated with the easy-adhesion process, Located on the opposite side of the pattern printing layer from the transparent substrate, the surface protective layer is made of a transparent resin material, Equipped with, The pattern printing layer has a light-transmitting portion along the thickness direction of the pattern printing layer, The surface protective layer covers the surface portion of the transparent substrate exposed in the transparent portion, and the pattern printing layer. printed matter.

2. When the transmittance of visible light passing through the transparent substrate is T1, and the transmittance of visible light passing through the transparent substrate and the surface protective layer is T2, T1 ≤ T2 satisfies the following conditions. The printed material according to claim 1.

3. The thickness of the surface protective layer is 5 μm or more and 100 μm or less. The printed material according to claim 1.

4. The aforementioned surface protective layer is composed of an acrylic resin. The printed material according to claim 1.

5. A printed document according to any one of claims 1 to 4, A light source that transmits light to the aforementioned printed material, Equipped with, Display device.

6. A printed document according to any one of claims 1 to 4, A solar panel facing the side of the transparent substrate of the printed material that is opposite to the pattern printing layer, Equipped with, structure.

Images