Image display device and method for manufacturing an image display device

Abstract

To provide an image display device and a method for manufacturing an image display device that make the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit, and maintain the brightness of the image display area 3 when the display is lit. [Solution] The image display device 1 comprises a cover panel 2, an image panel 4 having an image display area 3 and a non-display area 9, a light-shielding layer 6 provided at a position corresponding to the periphery of the non-display area 9 of the cover panel 2, and an adhesive layer 5 that joins the light-shielding layer 6 side of the cover panel 2 to the image panel 4. The adhesive layer 5 comprises a transparent adhesive layer 7 provided at a position corresponding to the image display area 3 and a colored layer 8. The colored layer 8 is in contact with the light-shielding layer 6 and the transparent adhesive layer 7, and is provided around the transparent adhesive layer 7, with a transmittance to light with a wavelength of 550 nm higher than that of the light-shielding layer 6 and a transmittance to light with a wavelength of 550 nm lower than that of the transparent adhesive layer 7.

Description

[Technical Field]

[0001] This technology relates to an image display device and a method for manufacturing an image display device. [Background technology]

[0002] In recent years, there has been a growing demand for creating a sense of luxury in the interior space of vehicles. For example, in the case of displays (image panels), there is a demand for them to blend seamlessly with the surrounding instrument panel when the display is not lit, that is, when the display is not in operation.

[0003] Figure 10 is a plan view showing an example of a conventional image display device 100. In the image display device 100, the boundary 104 between the light-shielding layer 102 of the cover panel 101 (top cover) and the image display area 103 of the image panel is easily visible, and a sense of unity has not been achieved. Thus, there is a need to make the visibility of the boundary 104 more seamless when the display is not lit. In addition to making the visibility of the boundary 104 more seamless when the display is not lit, there is also a need to maintain the brightness of the image display area 103 when the display is lit (when the display is operating).

[0004] Patent Document 1 describes a vehicle display device that can display display areas shown on different display units with a good sense of seamlessness, wherein the cover glass is provided along the boundary between the first display area and the second display area, and has a gradient portion that gradually becomes thinner as it moves away from the boundary.

[0005] However, the technology described in Patent Document 1 enables seamless display of multiple display units when the display is lit, but does not make the visibility of the boundary between the light-shielding layer and the image display area seamless when the display is not lit.

[0006] Patent Document 2 describes a vehicle display device that can create a sense of unity between the design plate and the image display surface. This device has a gradient portion provided on the image display surface side of the substrate, between the transparent portion and the light-shielding portion, formed by changing the density per unit area of ​​multiple granular dots made of a light-shielding printing layer of the same color as the light-shielding printing layer, and an overcoat portion that covers the surface of the multiple dots with a transparent printing layer. Patent Document 2 also states that the overcoat portion may be formed of a smoke material or the like.

[0007] However, the technology described in Patent Document 2 uses a light-shielding printed layer for the gradient area, so there are concerns that it may not achieve a seamless effect due to diffuse reflection unless used in combination with a light-reducing (smoke) overcoat resin with low transmittance. In addition, because the overcoat layer for the gradient area and the image display area are integrated, there are concerns about a significant decrease in image brightness when the display is lit. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2024-048141 [Patent Document 2] Japanese Patent Publication No. 2019-086378 [Overview of the project] [Problems that the invention aims to solve]

[0009] This technology was proposed in light of the conventional situation described above, and provides an image display device and a method for manufacturing an image display device that can make the boundary between the light-shielding layer and the image display area seamless when the display is not lit, and maintain the brightness of the image display area when the display is lit. [Means for solving the problem]

[0010] The image display device according to this technology comprises a cover panel, an image panel having an image display area and a non-display area, a light-shielding layer provided at a position corresponding to the periphery of the non-display area of ​​the cover panel, and an adhesive layer that joins the light-shielding layer side of the cover panel to the image panel, wherein the adhesive layer comprises a transparent adhesive layer provided at a position corresponding to the image display area, and a colored layer that is in contact with the light-shielding layer and the transparent adhesive layer and is provided around the transparent adhesive layer, and has a transmittance to light with a wavelength of 550 nm that is higher than that of the light-shielding layer and a transmittance to light with a wavelength of 550 nm that is lower than that of the transparent adhesive layer.

[0011] A method for manufacturing an image display device according to this technology comprises the steps of: A step of forming a colored layer by applying a composition for a colored layer to the peripheral edge of the non-display area of ​​an image panel having an image display area and a non-display area, or to the peripheral edge of a light-shielding layer provided at a position corresponding to the peripheral edge of the non-display area of ​​a cover panel, and curing it; B step of forming a transparent adhesive layer by applying a composition for a transparent adhesive layer to the inner periphery of the colored layer, and curing it; and C step of bonding the light-shielding layer side of the cover panel to the image panel, wherein the transparent adhesive layer is provided at a position corresponding to the image display area, the colored layer is in contact with the light-shielding layer and the transparent adhesive layer, and is provided around the transparent adhesive layer, and has a higher transmittance to light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance to light with a wavelength of 550 nm than the transparent adhesive layer. [Effects of the Invention]

[0012] This technology seamlessly improves the visibility of the boundary between the light-shielding layer and the image display area when the display is not lit, while maintaining the brightness of the image display area when the display is lit. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a plan view showing an example of an image display device related to this technology. [Figure 2] Figure 2 is a cross-sectional view showing an example of the a-a' section in Figure 1. [Figure 3] FIG. 3 is a cross-sectional view showing an example of an image display device according to the present technology. [Figure 4] FIG. 4 is a cross-sectional view showing an example of an image display device according to the present technology. [Figure 5] FIG. 5 is a cross-sectional view showing an example of an image display device according to the present technology. [Figure 6] FIG. 6 is a cross-sectional view showing an example of an image display device according to the present technology. [Figure 7] FIG. 7 is a perspective view showing an example of a vehicle instrument panel to which an image display device according to the present technology is applied. [Figure 8] FIG. 8 is a cross-sectional view showing an example of a vehicle instrument panel to which an image display device according to the present technology is applied. [Figure 9] FIG. 9 is a perspective view for explaining an example of a method for manufacturing an image display device according to the present technology. [Figure 10] FIG. 10 is a plan view showing an example of a conventional image display device.

MODE FOR CARRYING OUT THE INVENTION

[0014] <Image display device> FIG. 1 is a plan view showing an example of an image display device according to the present technology. FIG. 2 is a cross-sectional view showing an example of the a-a' cross-section in FIG. 1. The image display device 1 includes a cover panel 2, an image panel 4 having an image display area 3 and a non-display area 9, an adhesive layer 5 that joins the light-shielding layer 6 side of the cover panel 2 and the image panel 4, and a light-shielding layer 6 provided at a position corresponding to the periphery of the non-display area 9 of the cover panel 2. The transparent adhesive layer 7 and the colored layer 8 have different transmittances for light with a wavelength of 550 nm. The adhesive layer 5 includes a transparent adhesive layer 7 and a colored layer 8. The first adhesive layer 7 is provided at a position corresponding to the image display area 3. The colored layer 8 is provided at a position corresponding to the non-display area 9, contacts the light-shielding layer 6 and the transparent adhesive layer 7, is provided around the transparent adhesive layer 7, has a transmittance for light with a wavelength of 550 nm higher than that of the light-shielding layer 6, and has a transmittance for light with a wavelength of 550 nm lower than that of the transparent adhesive layer 7.

[0015] In the image display device 1, a colored layer 8 is formed between the light-shielding layer 6 and the transparent adhesive layer 7. Therefore, compared to the case where the light-shielding layer 6 and the transparent adhesive layer 7 are adjacent, the image display device 1 has a more gradual gradient from the light-shielding layer 6 to the transparent adhesive layer 7. As a result, for example, when the display of the image display device 1 is not lit, if a user views the image display device 1 from the viewing direction D in Figure 2, it becomes difficult to see the boundary between the light-shielding layer 6 and the image display area 3. In such an image display device 1, the colored layer 8 makes the visibility of the boundary between the light-shielding layer 6 and the image display area 3 in the viewing direction D when the display is not lit more seamless. Here, whether the visibility of the boundary between the light-shielding layer 6 and the image display area 3 when the display is not lit is seamless can be evaluated by the method described in the embodiment described later.

[0016] To determine whether the visibility of the boundary between the light-shielding layer 6 and the image display area 3 is seamless when the display is not lit, one can refer to, for example, the color difference △E of the colored layer 8 relative to the light-shielding layer 6. For example, if the color difference △E is less than 1.9, the visibility of the boundary between the light-shielding layer 6 and the image display area 3 tends to be seamless when the display is not lit. The color difference △E can be measured by the method described in the embodiment described later.

[0017] Furthermore, since the image display device 1 has a transparent adhesive layer 7 at a position corresponding to the image display area 3 in the viewing direction D in Figure 2, the brightness of the image display area 3 can be maintained when the display is lit. Therefore, the image display device 1 does not require measures to improve brightness by increasing the current of, for example, the backlight or OLED (Organic Light Emitting Diode), and can suppress the reduction in the lifespan of the backlight or OLED and the increase in power consumption.

[0018] In this way, the image display device 1 makes the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit, and maintains the brightness of the image display area 3 when the display is lit.

[0019] [Cover Panel] The cover panel 2 is light-transmitting and is laminated with the image panel 4 via an adhesive layer 5 to cover and protect the display surface of the image panel 4 while ensuring the visibility of the image panel 4.

[0020] The material for the cover panel 2 only needs to have light transmittance that allows the image formed on the image panel 4 to be visible. Examples include glass, acrylic resin, polyethylene terephthalate, polyethylene naphthalate, and polycarbonate. These materials can be treated with a single-sided or double-sided hard coat, anti-reflective coating, etc. Furthermore, if the image panel 4 is a touch panel, for example, a part of the touch panel components can be used as the cover panel 2.

[0021] Furthermore, to improve the brightness and contrast of the displayed image, the cover panel 2 has a black frame-shaped light-shielding layer 6, known as a black matrix, formed at a position corresponding to the periphery of the non-display area 9 of the image panel 4. The light-shielding layer 6 is formed to a uniform thickness by, for example, applying a colored paint such as black using a screen printing method, and then drying and curing it. The thickness of the light-shielding layer 6 can be, for example, 5 to 100 μm. Preferably, the light-shielding layer 6 has a transmittance of 0% for light with a wavelength of 550 nm.

[0022] The shape of the cover panel 2 is not particularly limited and can be set appropriately according to the shape of the image display device 1, etc. For example, the cover panel 2 is a rectangular plate. The cover panel 2 may also have a curved shape, for example, a concave curved shape in one direction, a convex curved shape, a paraboloid of revolution, a hyperbolic paraboloid, or other quadratic curved shape, and may also have flat parts in part of the curved shape and the quadratic curved shape. The dimensional characteristics such as the shape and thickness of the cover panel 2, and physical properties such as elasticity can be appropriately determined according to the intended use of the image display device 1.

[0023] [Image Panel] The image panel 4 has an image display area 3 and a non-display area 9. Examples of image display elements for the image panel 4 include liquid crystal display panels, organic EL display panels, plasma display panels, and touch panels. Here, a touch panel refers to an image display / input panel that combines a display element such as a liquid crystal display panel with a position input device such as a touchpad. The surface shape of the cover panel 2 side of the image panel 4 is not particularly limited, but is preferably flat, for example. A polarizing plate may also be placed on the surface of the image panel 4. The non-display area 9 is an area where no image is displayed. The width of each non-display area 9 depends on the type of image panel 4, but can be, for example, about 1 to 3 mm.

[0024] [Adhesive layer] The adhesive layer 5 joins the cover panel 2 and the image panel 4. The adhesive layer 5 is interposed between the cover panel 2 and the image panel 4. The adhesive layer 5 comprises a transparent adhesive layer 7 and a colored layer 8.

[0025] [Transparent adhesive layer] The transparent adhesive layer 7 is light-transmitting and is provided at a position corresponding to the image display area 3, making the image displayed by the image panel 4 visible. From the viewpoint of maintaining the brightness of the image display area 3 when the display is lit, the transparent adhesive layer 7 preferably has a transmittance of 70% or more for light with a wavelength of 550 nm, it may be 80% or more, it may be more than 80%, it may be 81% or more, it may be 85% or more, it may be 90% or more, it may be 95% or more, it may be 98% or more, it may be 99% or more, and it may be 100%.

[0026] The thickness of the transparent adhesive layer 7 is not particularly limited as long as it is within the range in which the effects of this technology are achieved, and can be set appropriately depending on the application. For example, it can be 100 to 500 μm, or it may be 50 to 500 μm.

[0027] The transparent adhesive layer 7 is obtained by curing a composition 11 for the transparent adhesive layer, for example, a photocurable composition (photocurable resin composition). The composition 11 for the transparent adhesive layer is preferably liquid at 25°C. Furthermore, in order to more effectively achieve good inkjet suitability under normal inkjet ejection conditions, the viscosity of the composition 11 for the transparent adhesive layer at 25°C is preferably 1 mPa·s or more, may be 10 mPa·s or more, may be 1 to 30 mPa·s, or may be 3 to 20 mPa·s.

[0028] The composition 11 for the transparent adhesive layer can, for example, contain the following components (A), (B), (C), and (D), or contain components (B), (C), and (D).

[0029] Component (A) is a film-forming component of the light-transmitting transparent adhesive layer 7, and can be an acrylic oligomer or an acrylic polymer. Examples of acrylic oligomers include (meth)acrylate oligomers having polyisoprene, polyurethane, polybutadiene, etc. as a backbone. In this specification, "(meth)acrylate" is a term that encompasses both acrylate and methacrylate. Examples of (meth)acrylate oligomers with a polyisoprene backbone include esterified products of a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate (UC102 (polystyrene equivalent molecular weight 17,000), UC203 (polystyrene equivalent molecular weight 35,000), UC-1 (molecular weight approximately 25,000), all manufactured by Kuraray Co., Ltd.). Examples of (meth)acrylic oligomers having a polyurethane skeleton include aliphatic urethane acrylates (EBECRYL230 (molecular weight 5,000), manufactured by Daicel Ornex, UA-1, manufactured by Light Chemical Co., Ltd.). Examples of acrylic polymers include (meth)acrylate polymers that do not have (meth)acroyl groups. For example, examples include (meth)acrylate polymers that do not have (meth)acroyl groups and have a hydroxyl value of 120 mgKOH / g or more, more preferably 170 mgKOH / g or more. By using such base components, for example, it is possible to impart plasticity to the cured product while ensuring good film formation (film maintenance) and adhesion.

[0030] The hydroxyl value of (meth)acrylate polymer is the mass (mg) of KOH required to neutralize the acetic acid produced by hydrolyzing the acetyl groups after acetylating the hydroxyl groups in 1g of polymer. Therefore, a higher hydroxyl value means a greater number of hydroxyl groups. By setting the hydroxyl value of component (A), the (meth)acrylate polymer, to, for example, 120 mgKOH / g or higher, it is possible to suppress a decrease in the crosslinking density of the cured product of the photocurable resin composition, and in particular, to suppress a decrease in the elastic modulus at high temperatures. Furthermore, from the viewpoint of preventing the crosslinking density of the cured product of composition 11 for the transparent adhesive layer from becoming too high and losing flexibility, the hydroxyl value of the (meth)acrylate polymer is preferably 400 mgKOH / g or less, and more preferably 350 mgKOH / g or less. Furthermore, by using a (meth)acrylate polymer in component (A) that does not have a (meth)acroyl group, it is possible to prevent it from being excessively incorporated into the main chain of the polymerization chain composed of (meth)acrylate monomers of components (B) and (C).

[0031] When component (A) contains a (meth)acrylate polymer, if the weight-average molecular weight Mn of the (meth)acrylate polymer is too small, the number of molecules without hydroxyl groups increases, which tends to increase the risk of bleeding, etc. Therefore, it is preferably 5,000 or more, more preferably 100,000 or more. Also, if the weight-average molecular weight Mn of the (meth)acrylate polymer in component (A) is too large, it tends to lead to poor dispensing due to increased viscosity, so it is preferably 500,000 or less, more preferably 300,000 or less. In this specification, the weight-average molecular weight Mw and number-average molecular weight Mn of the polymer can be measured by gel permeation chromatography (GPC) (converted to standard polystyrene molecular weight).

[0032] Furthermore, if the dispersion (Mw / Mn) of the (meth)acrylate polymer of component (A) is too low, the polymer and unreacted monomers tend to separate easily, so it is preferably 3 or higher. If it is too high, it will result in the inclusion of undesirable, relatively low molecular weight polymer components, so it is preferably 10 or lower.

[0033] As such a component (A), a copolymer of a hydroxyl group-containing (meth)acrylate monomer and a hydroxyl group-free (meth)acrylate monomer is a preferred example. Component (A) is preferably liquid at room temperature.

[0034] The hydroxyl group-containing (meth)acrylate monomers that constitute the (meth)acrylate polymer of component (A) are (meth)acrylates having one or more hydroxyl groups in the molecule. Specifically, examples include 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxy-3-chloropropyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, ethylene glycol (meth)acrylate, polyethylene glycol (meth)acrylate, propylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, cyclohexyl dimethanol mono(meth)acrylate, etc. Among these, 2-hydroxyethyl (meth)acrylate is a preferred example in terms of polarity control and cost.

[0035] Examples of hydroxyl group-free (meth)acrylate monomers that can constitute the (meth)acrylate polymer of component (A) include, for example, monocyclic alkyl (meth)acrylates having a linear or branched alkyl group with 1 to 18 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, tridecyl (meth)acrylate, and the like.

[0036] A particularly preferred example of the (meth)acrylate polymer of component (A) is a copolymer of 2-hydroxyethyl acrylate and 2-ethylhexyl acrylate, from the viewpoint of availability and feasibility of realizing the effects of the invention. Isobornyl acrylate may be further copolymerized.

[0037] If the composition 11 for the transparent adhesive layer contains component (A), the amount of component (A) in the composition 11 for the transparent adhesive layer can be changed according to the amounts of the other components (B), (C), and (D). For example, the composition 11 for the transparent adhesive layer does not have to contain component (A). Also, if the composition 11 for the transparent adhesive layer contains component (A), the amount of component (A) in the composition 11 for the transparent adhesive layer can be, for example, 1% by mass or more, or 10% by mass or more. Also, the amount of component (A) in the composition 11 for the transparent adhesive layer can be 55% by mass or less, or 45% by mass or less.

[0038] The composition 11 for the transparent adhesive layer preferably contains a hydroxyl group-containing monotubular (meth)acrylate monomer as component (B) as a polymerization component. This is because, when component (A) contains a hydroxyl group-containing (meth)acrylate polymer, the affinity with the hydroxyl group-containing (meth)acrylate polymer is high, and reliability in high temperature and high humidity environments is further improved. In this case, there may be multiple hydroxyl groups in the monomer molecule, but it is preferable that there is one in the monomer molecule.

[0039] Specific examples of the hydroxyl group-containing monofunctional (meth)acrylate monomer of component (B) include monomers similar to the hydroxyl group-containing (meth)acrylate monomer of component (A) that can constitute the (meth)acrylate polymer. Among these, at least one selected from 4-hydroxybutyl (meth)acrylate and 2-hydroxyethyl (meth)acrylate is preferred.

[0040] In the composition 11 for the transparent adhesive layer, the content of component (B), the hydroxyl group-containing monotubular (meth)acrylate monomer, is preferably 1% by mass or more, more preferably 5% by mass or more, because if it is too low, it tends to lead to insufficient reliability in high temperature and high humidity environments. If it is too high, it tends to disrupt the polarity balance of the resin before or after curing, resulting in opacity. Therefore, it is preferably 30% by mass or less, more preferably 25% by mass or less.

[0041] The composition 11 for the transparent adhesive layer preferably contains a hydroxyl-free monotubular (meth)acrylate monomer as component (C), which is a polymerization component. The reason why a hydroxyl-free component is preferred is to set the adhesion and viscosity of the cured product (transparent adhesive layer 7) of the composition 11 for the transparent adhesive layer to a better range, and to further improve the performance of the transparent adhesive layer 7.

[0042] Specific examples of the hydroxyl group-free monofunctional (meth)acrylate monomer of component (C) include monomers similar to the hydroxyl group-free (meth)acrylate monomer of component (A) that can constitute the (meth)acrylate polymer. For example, at least one selected from isobornyl acrylate, isostearyl (meth)acrylate, phenoxypolyethylene glycol acrylate, and ethyl carbitol (meth)acrylate is preferred, and combinations thereof may also be used.

[0043] In the composition 11 for the transparent adhesive layer, if the amount of component (C) is too small, it tends to become highly viscous, so it is preferably 30% by mass or more, more preferably 65% ​​by mass or more, and if it is too large, it tends to become brittle, so it is preferably 90% by mass or less, more preferably 75% by mass or less.

[0044] The composition 11 for the transparent adhesive layer can use known photoradical polymerization initiators as component (D). In particular, component (D) preferably contains a hydrogen abstraction type photopolymerization initiator, and a hydrogen abstraction type photopolymerization initiator may be used in combination with other photopolymerization initiators (e.g., intramolecular cleavage type photopolymerization initiators).

[0045] As hydrogen abstraction type photopolymerization initiators, known hydrogen abstraction type photopolymerization initiators can be used, such as diaryl ketones like benphenone and phenylglyoxylates like methylbenzoyl formate. A preferred example is methylbenzoyl formate, which does not yellow and has high hydrogen abstraction ability.

[0046] In the composition 11 for the transparent adhesive layer, the content of component (D) is preferably 0.1% by mass or more, more preferably 1% by mass or more, because if it is too low, it tends to result in insufficient crosslinking, and if it is too high, it tends to cause deterioration of environmental reliability, so it is preferably 10% by mass or less, more preferably 5% by mass or less.

[0047] The composition 11 for the transparent adhesive layer may further contain a polyfunctional (meth)acrylate monomer as component (E) to improve the reaction rate and maintain the high-temperature modulus. Specific examples of polyfunctional (meth)acrylate monomers include two or more functional (meth)acrylates such as 1,6-hexanediol diacrylate (HDDA), 1,9-nonanediol diacrylate, 1,10-decanediol diacrylate, pentaerythritol triacrylate, and alkoxylated trimethylolpropane acrylate. These can have other functional groups such as hydroxyl groups, as long as they do not impair the effects of this technology. Among these, a preferred specific example of a polyfunctional (meth)acrylate monomer is alkoxylated trimethylolpropane acrylate (e.g., ethoxylated trimethylolpropane triacrylate). When the composition 11 for the transparent adhesive layer contains component (E), the amount of component (E) in the composition 11 for the transparent adhesive layer is preferably 0.05% or more, more preferably 0.1% or more, because if it is too little, it tends to result in a low crosslinking density, and preferably 5% by mass or less, more preferably 3% by mass or less, because if it is too much, it tends to become brittle.

[0048] In addition to the components (A) to (D) described above, the composition 11 for the transparent adhesive layer may contain various additives within a range that does not impair the effects of this technology. For example, polybutadiene-based plasticizers, polyisoprene-based plasticizers, phthalate ester-based plasticizers, adipic acid ester-based plasticizers, polyisoprene-based plasticizers, polyether-based plasticizers, etc. can be used as plasticizers (liquid plasticizers) to reduce curing shrinkage. Furthermore, terpene-based resins, rosin resins, petroleum resins, etc. can be used as tackifiers to improve tackiness. In addition, 2-mercaptoethanol, lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-ethylhexyl thioglycolate, 2,3-dimethylcapto-1-propanol, α-methylstyrene dimer, etc. may be used as chain transfer agents to adjust the molecular weight of the cured product. Furthermore, if necessary, general additives such as adhesion improvers like silane coupling agents, antioxidants, leveling agents (surface modifiers), and UV absorbers may be used.

[0049] The content of each component in the composition 11 for the transparent adhesive layer can be, for example, 1 to 55% by mass of component (A), 1 to 30% by mass of component (B), 30 to 90% by mass of component (C), and 0.1 to 10% by mass of component (D). Alternatively, the content of each component in the composition 11 for the transparent adhesive layer can be, for example, 10 to 25% by mass of component (B), 65 to 75% by mass of component (C), 1 to 5% by mass of component (D), 0.05 to 3% by mass of component (E), and 5% by mass or less of other components.

[0050] [Colored layer] The colored layer 8 is provided in a position corresponding to the non-display area 9. The second adhesive layer 8 is in contact with the light-shielding layer 6 and the transparent adhesive layer 7, and is provided around the transparent adhesive layer 7. As shown in Figure 2, for example, the colored layer 8 covers a part of the surface of the light-shielding layer 6 on the image panel 4 side in a position corresponding to the non-display area 9, and is formed between the image panel 4 and the cover panel 2. It is preferable that the colored layer 8 is formed in an area other than the image display area 3. The width of the colored layer 8 that can be seen when viewing the image display device 1 from the viewing direction D in Figure 2, specifically the width of the boundary 10 between the light-shielding layer 6 and the colored layer 8, and the boundary 12 between the colored layer 8 and the transparent adhesive layer 7, is preferably not too large in terms of not affecting the brightness of the image display area 3 when the display is lit, and preferably not too small in terms of making the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit. For example, the width between boundary 10 and boundary 12 can be approximately 1 to 3 mm.

[0051] With respect to making the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit, the colored layer 8 is not particularly limited as long as its transmittance to light at a wavelength of 550 nm is higher than that of the light-shielding layer 6 and lower than that of the transparent adhesive layer 7. For example, the colored layer 8 preferably has a transmittance of 60% or less to light at a wavelength of 550 nm, but may also be 56% or less, 50% or less, 34% or less, 20% or less, 15-60%, 15-56%, 20-60%, 20-50%, or 15-20%. For example, by having a transmittance of 60% or less to light at a wavelength of 550 nm, the visibility of the boundary between the light-shielding layer 6 and the image display area 3 when the display is not lit can be made more seamless. Furthermore, the lower limit of the transmittance of the colored layer 8 to light with a wavelength of 550 nm is not particularly limited; for example, it may be 1% or more, 5% or more, or 10% or more, but a transmittance of 15% or more tends to result in better photocurability of the composition 13 for the colored layer 8.

[0052] The colored layer 8 is, for example, a cured version of composition 13 for the colored layer. Composition 13 for the colored layer is, for example, a photocurable composition (photocurable resin composition). Composition 13 for the colored layer is the composition 11 for the transparent adhesive layer described above, with a coloring agent, such as a black pigment, added. Composition 13 for the colored layer can have the same structure as composition 11 for the transparent adhesive layer, except that it contains a coloring agent. The content of black pigment, which is an example of a coloring agent, in composition 13 for the colored layer can be, for example, 0.10 to 2.0% by mass, may be 0.19% by mass or more, may be 0.19% by mass or more and less than 0.85% by mass, or may be 0.19 to 0.80% by mass.

[0053] The optimal transmittance of the colored layer 8 for light with a wavelength of 550 nm depends on the color of the light-shielding layer 6 and the color of the image display area 3 when the display is not lit. Since the color of the light-shielding layer 6 and the color of the image display area 3 when the display is not lit vary depending on the materials used and the design, it is preferable that the optimal transmittance of the colored layer 8 for light with a wavelength of 550 nm can be easily adjusted accordingly. The transmittance of the colored layer 8 for light with a wavelength of 550 nm can be set to a desired value by adjusting, for example, the transmittance characteristics of the composition 13 for the colored layer (e.g., the amount of colorant) or the thickness of the colored layer 8.

[0054] Figure 3 is a cross-sectional view showing an example of an image display device 20 according to this technology. The image display device 20 has the same configuration as the image display device 1, except that the thickness of the colored layer 8 (length of the colored layer 8 in the viewing direction D) at the position corresponding to the non-display area 9 is smaller than that of the image display device 1, and the width of the transparent adhesive layer 7 on the image panel 4 side extends to the position corresponding to the non-display area 9. Thus, in the image display device 20, the colored layer 8 and the transparent adhesive layer 7 are laminated at the position corresponding to the non-display area 9. As in the image display device 20, the transmittance of the colored layer 8 to light with a wavelength of 550 nm can be adjusted by changing the thickness of the colored layer 8.

[0055] The image display device 1 may be formed such that the thickness of the colored layer 8 at the position corresponding to the non-display area 9 decreases from the light-shielding layer 6 side toward the transparent adhesive layer 7 side. For example, the image display device 1 may be formed such that the thickness of the colored layer 8 at the position corresponding to the non-display area 9 decreases continuously or stepwise from the light-shielding layer 6 side toward the transparent adhesive layer 7 side.

[0056] Figure 4 is a cross-sectional view showing an example of an image display device 30 according to this technology. The image display device 30 has the same configuration as the image display device 1, except that the thickness of the colored layer 8 at the position corresponding to the non-display area 9 is formed to decrease continuously from the light-shielding layer 6 side toward the transparent resin layer 7 side (image display area 3 side), starting from the boundary 10. By continuously changing the thickness of the colored layer 8 at the position corresponding to the non-display area 9, as in the image display device 30, the transmittance of light with a wavelength of 550 nm on the light-shielding layer 6 side of the adhesive layer 5 can be made smaller than the transmittance of light with a wavelength of 550 nm on the transparent resin layer 7 side, and a more gradual gradient is formed from the light-shielding layer 6 to the transparent adhesive layer 7, making the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit. Furthermore, the thickness of the colored layer 8 at the position corresponding to the non-display area 9 may be formed to continuously decrease from the light-shielding layer 6 side toward the transparent resin layer 7 side, starting from, for example, the space between boundary 10 and boundary 12 in the image display device 1 (for example, the central part between boundary 10 and boundary 12). Alternatively, the thickness of the colored layer 8 at the position corresponding to the non-display area 9 may be formed by a combination of continuously decreasing and gradually decreasing from the light-shielding layer 6 side toward the transparent adhesive layer 7 side.

[0057] In the image display device 30, for example, the light-shielding layer 6 and the transparent adhesive layer 7 are in contact on the cover panel 2 side. In the image display device 30, the width of the transparent adhesive layer 7 is greater on the cover panel 2 side than on the image panel 4 side. In the image display device 30, the width of the colored layer 8 is smaller on the cover panel 2 side than on the image panel 4 side.

[0058] The image display device 1 may be formed such that the thickness of the colored layer 8 at the position corresponding to the non-display area 9 decreases in stages from the light-shielding layer 6 side toward the transparent adhesive layer 7 side. Figure 5 is a cross-sectional view showing an example of the image display device 40 according to this technology. Figure 6 is a cross-sectional view showing an example of the image display device 40A according to this technology. The image display devices 40 and 40A have the same configuration as the image display device 1, except that the thickness of the colored layer 8 at the position corresponding to the non-display area 9 decreases in stages from the light-shielding layer 6 side toward the transparent resin layer 7 side. By gradually changing the thickness of the colored layer 8 in the non-display area 9, as in the image display devices 40 and 40A, the transmittance of light with a wavelength of 550 nm on the light-shielding layer 6 side of the adhesive layer 5 can be made smaller than the transmittance of light with a wavelength of 550 nm on the transparent resin layer 7 side, and a more gradual gradient is formed from the light-shielding layer 6 to the transparent adhesive layer 7, making the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit.

[0059] Figure 7 is a perspective view showing an example of a vehicle instrument panel 41 to which the image display device according to this embodiment (image display devices 1, 20, 30, 40, 40A) is applied. Figure 8 is a cross-sectional view showing an example of a vehicle instrument panel 41 to which the image display device according to this technology is applied.

[0060] The image display device according to this embodiment can make the visibility of the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit, and can therefore be suitably used, for example, as a vehicle instrument panel 41 incorporated within a black housing 42. Furthermore, by using the image display device according to this embodiment as a vehicle instrument panel 41, the design of the interior space can be improved in various vehicle types, including next-generation vehicles equipped with high-definition and curved-surface compatible OLEDs. In addition, since the image display device according to this embodiment can maintain the brightness of the image display area 3 when the display is lit, it can be suitably used, for example, as a vehicle instrument panel 41 in an electric vehicle where power consumption is important.

[0061] <Manufacturing method for image display devices> Figure 9 is a perspective view illustrating an example of a method for manufacturing an image display device according to this technology. The method for manufacturing an image display device according to this embodiment includes, for example, the following steps A, B, and C.

[0062] Step A: A colored layer 8 is formed by applying a colored layer composition 13 to the peripheral portion of the light-shielding layer 6 located at a position corresponding to the peripheral portion of the non-display area 9 of the cover panel 2, or to the peripheral portion of the non-display area 9 of the image panel 4, and curing it. Step B: A transparent adhesive layer 7 is formed by applying composition 11 for the transparent adhesive layer to the inner circumference of the colored layer 8 and curing it. Step C: The light-shielding layer 6 side of the cover panel 2 is bonded to the image panel 4.

[0063] [Process A] In the manufacturing method of the image display device 1, for example, in step A (ST1 in Figure 9), it is preferable to apply the composition 13 for the colored layer to the surface of the cover panel 2 on the side where the light-shielding layer 6 is formed using an inkjet device 43 to form a composition film 44 for the colored layer.

[0064] The inkjet device 43 is an ejection device that employs a so-called inkjet method, having, for example, one or more ejection heads with multiple ejection holes arranged in a predetermined pattern, and ejecting fine droplets from the ejection holes to adhere to the cover panel 2. Compared to, for example, a die coater or dispenser, the inkjet device 43 can coat the material with higher precision in position and size. In addition, the inkjet device 43 makes it easy to coat the colored layer composition 13 with a desired thickness and pattern, and also offers a fast coating speed.

[0065] The coating thickness of the colored layer composition film 44 can be appropriately set according to the surface condition of the cover panel 2 and the image panel 4, the required film properties of the adhesive layer 5, etc. The inkjet device 43 has an ejection head with multiple ejection holes that is installed facing the surface of the cover panel 2 and ejects the colored layer composition 13 while moving relative to the cover panel 2. The inkjet device 43 may adjust the ejection width and ejection force by providing multiple ejection heads. Multiple ejection heads may be arranged in parallel or in a staggered pattern. The colored layer composition 13 preferably has a low viscosity that can be ejected by the inkjet device 43.

[0066] If the composition 13 for the colored layer is a photocurable composition, it can be cured by light irradiation. The light irradiation conditions for the composition 13 for the colored layer are preferably set to a degree that allows the curing to be maintained at least to the extent that the coated shape of the composition 13 for the colored layer can be maintained. The light source 45 can be a known light source such as an LED, UV lamp, mercury lamp, metal halide lamp, or xenon lamp.

[0067] Here, the curing rate is defined as the ratio (consumption ratio) of the amount of (meth)acryloyl groups present after light irradiation to the amount of (meth)acryloyl groups present in the composition 13 for the colored layer before light irradiation. A higher curing rate indicates that curing has progressed further. Specifically, the curing rate is measured from 1640 to 1620 cm from the baseline in the FT-IR measurement chart of the composition 13 for the colored layer before light irradiation. -1 The absorption peak height (X) and the FT-IR measurement chart of composition 13 for the colored layer after light irradiation, from baseline 1640 to 1620 cm². -1 The absorption peak height (Y) can be calculated by substituting it into the following equation A. Formula A: Curing rate (%)=[(XY) / X]×100

[0068] The conditions for light irradiation in step A are not particularly limited in terms of the type of light source, output, illuminance, integrated light amount, etc. For example, the curing rate may be limited to a degree that maintains the coated shape of the colored layer composition 13 (so-called partial curing), or it may be completely cured (so-called full curing). Partial curing means, for example, that the curing rate of the colored layer composition 13 after light irradiation is about 40-50%. Full curing means, for example, that the curing rate of the colored layer composition 13 after light irradiation is 90% or more, may be 95% or more, or 99% or less.

[0069] In step A, if the desired thickness cannot be obtained with a single application by the inkjet device 43, the colored layer composition 13 may be applied multiple times. In this case, after applying the colored layer composition 13 multiple times, the colored layer composition 13 may be irradiated with light.

[0070] Furthermore, in step A, the process of applying the colored layer composition 13 and then irradiating it with light may be repeated multiple times. This makes it possible to sufficiently cure the colored layer composition 13 even when low light transmittance is used, and for example, a colored layer 8 with low transmittance to light at a wavelength of 550 nm (for example, a colored layer 8 with transmittance of less than 15% to light at a wavelength of 550 nm) can be obtained.

[0071] [Process B] In step B (ST2 in Figure 9), it is preferable to apply the composition 11 for the transparent adhesive layer to the inner circumference of the colored layer 8, and then flatten and cure the surface of the composition 11 to form the transparent adhesive layer 7. In step B, it is preferable to apply the composition 11 for the transparent adhesive layer using an inkjet device 43 to form the composition film 46 for the transparent adhesive layer. If the composition 11 for the transparent adhesive layer is a photocurable composition, it can be cured by light irradiation. The curing method for the composition 11 for the transparent adhesive layer can be the same as that for the composition 13 for the colored layer in step A. In step B, the process of applying the composition 11 for the transparent adhesive layer and then irradiating it with light may be repeated multiple times.

[0072] [Process C] In step C, the light-shielding layer side 6 of the cover panel 2 is bonded to the image panel 4. This yields the image display device 1 described above. The bonding of the cover panel 2 and the image panel 4 can be performed by applying pressure under a predetermined temperature environment (e.g., 10 to 80°C) using a known bonding device. To prevent air bubbles from forming between the cover panel 2 and the adhesive layer 5 (transparent adhesive layer 7 and colored layer 8), the bonding may be performed using a vacuum bonding method.

[0073] In the manufacturing method of the image display device 1, after step C, light irradiation may be further performed from the cover panel 2 side to fully cure the composition 13 for the colored layer and the composition 11 for the transparent adhesive layer.

[0074] From the viewpoint of achieving the effects of this technology more effectively, it is preferable that the manufacturing method of the image display device 1 involves, in step A, applying a photocurable colored layer composition 13 using an inkjet device 43 and curing the photocurable colored layer composition 13 by light irradiation, and in step B, applying a photocurable transparent adhesive layer composition 11 using an inkjet device 43 and curing the photocurable transparent adhesive layer composition 11 by light irradiation.

[0075] The manufacturing method for the image display device 1 described above assumes that the composition 13 for the colored layer and the composition 11 for the transparent adhesive layer are applied to the surface of the cover panel 2, but is not limited to this example. For example, the composition 13 for the colored layer and the composition 11 for the transparent adhesive layer may be applied to the surface of the image panel 4 (for example, the peripheral area of ​​the non-display region 9) before the cover panel 2 is bonded to it.

[0076] In the manufacturing method of the image display device 20 shown in Figure 3, for example, in step A, a colored layer 8 is formed such that the thickness of the colored layer 8 is smaller than that of the image display device 1. In step B, after applying the composition 11 for the transparent adhesive layer to the inner circumference of the colored layer 8, the composition 11 for the transparent adhesive layer is applied so that the width of the outermost transparent adhesive layer 7 extends to a position corresponding to the non-display area 9. The transparent adhesive layer 7 can then be formed by flattening and curing the surface of the composition 11 for the transparent adhesive layer.

[0077] In the manufacturing method of the image display device 30 shown in Figure 4, for example, in step A, a composition 13 for a colored layer is applied to the peripheral edge of the non-display area 9 of the image panel 4, forming a colored layer 8 such that the thickness of the colored layer 8 in the non-display area 9 decreases continuously toward the image display area 3. In step B, a composition 11 for a transparent adhesive layer is applied to the inner periphery of the colored layer 8, and then the surface of the composition 11 for the transparent adhesive layer is flattened and cured to form a transparent adhesive layer 7.

[0078] In the manufacturing method of the image display devices 40 and 40A shown in Figures 5 and 6, for example, in step A, a composition 13 for the colored layer is applied to the peripheral edge of the light-shielding layer 6 of the cover panel 2 to form a colored layer 8 such that the thickness at the position corresponding to the non-display area 9 decreases in stages from the light-shielding layer 9 side toward the transparent adhesive layer 7 side. In step B, a composition 11 for the transparent adhesive layer is applied to the inner circumference of the colored layer 8, and then the surface of the composition 11 for the transparent adhesive layer is flattened and cured to form a transparent adhesive layer 7.

[0079] Furthermore, in steps A and B, the colored layer 8 and the transparent adhesive layer 7 may be formed such that a portion of the application area of ​​the composition 13 for the colored layer and the composition 11 for the transparent adhesive layer are mixed. [Examples]

[0080] The following describes an embodiment of this technology. Note that this technology is not limited to this embodiment. In this embodiment, an evaluation image display device having a configuration similar to the image display device 1 shown in Figure 2 was fabricated, and the transmittance of the colored layer 8 to light with a wavelength of 550 nm and the visibility of the boundary 10 when the display is not lit (seamless effect) were confirmed.

[0081] For example, the following compositions were used as composition 13 for the colored layer and composition 11 for the transparent adhesive layer. In Table 1, "Resin viscosity" refers to the viscosity of composition 13 for the colored layer and composition 11 for the transparent adhesive layer at 25°C, and was measured using a rheometer (HaakeRheoSress600, Thermo Fisher Scientific; measurement conditions: cone rotor, φ=35mm, rotor angle 2°, shear rate 120 (1 / s)). In Table 1, the numerical value for pigment dispersion in the "Composition for colored layer" column represents the carbon black content (mass%) in the composition. In Table 1, numerical values ​​other than those in the resin viscosity and pigment dispersion columns represent parts by mass.

[0082] [Table 1]

[0083] The image display device for evaluation was fabricated using the following method. First, a colored layer composition 13 was applied using an inkjet device 43 to the inner circumference of the second adhesive layer on the surface of the cover panel 2 (component name: glass (143mm x 293mm)) on which the light-shielding layer 6 (black print, outer dimensions 143mm x 293mm, inner dimensions 103mm x 253mm) was formed, thereby forming a colored layer composition film 44. A UV lamp (manufactured by HOYA, UV irradiator: H-40AH4) was used to irradiate the colored layer composition film 44 under conditions that resulted in a curing rate of 40%. This formed a colored layer 8 on the periphery of the cover panel 2.

[0084] A composition 11 for the transparent adhesive layer was applied to the inner circumference of the colored layer 8 using an inkjet device 43 to form a composition film 46 for the transparent adhesive layer. The composition film 46 for the transparent adhesive layer was irradiated with light using a UV lamp under conditions that resulted in a curing rate of 40%. This formed the transparent adhesive layer 7.

[0085] Then, the cover panel 2, on which the colored layer 8 and the transparent adhesive layer 7 were formed, was bonded to the image panel 4 (component name: liquid crystal display), and an image display device for evaluation was obtained by curing it to a rate of 90% or more. In addition, by changing the content of the pigment dispersion in the composition 13 for the colored layer in the range of 0.10 to 0.85 mass%, and the resin thickness in the range of 50 to 200 μm, image display devices for evaluation with different transmittances of the colored layer 8 to light at a wavelength of 550 nm were also obtained, as shown in Table 2.

[0086] [Transmittance] The transmittance of the colored layer 8 to light at a wavelength of 550 nm was measured from the cover panel 2 side of the evaluation image display device using a UV-Vis spectrophotometer (UV-2600, manufactured by Shimadzu Corporation). The results are shown in Table 2. In Table 2, the "Transmittance" for the "Transparent Adhesive Layer" is the measurement result of the transmittance of the transparent adhesive layer 7 to light at a wavelength of 550 nm, and was measured in the same way as the colored layer 8. In the evaluation image display device, the transmittance of the light-shielding layer 6 to light at a wavelength of 550 nm, measured in the same way as the colored layer 8, was 0%.

[0087] [Seamless effect] The seamless effect of the boundary 10 in the viewing direction D when the display is not illuminated was visually evaluated when the transmittance of the colored layer 8 for light at a wavelength of 550 nm is a predetermined value shown in Table 2.

[0088] When there is no seamless effect, it was evaluated as "×" (NG), when the seamless effect was low, it was evaluated as "△" (OK), when there was a seamless effect, it was evaluated as "〇" (OK), and when the seamless effect was good, it was evaluated as "◎" (OK). In practical use, the seamless effect is preferably "◎", "〇", or "△", more preferably "◎" or "〇", and particularly preferably "◎". The results are shown in Table 2.

[0089] In Table 2, "-" means that the colored layer 8 could not be obtained (did not cure) (NG). Also, in Table 2, the "seamless effect" of the "transparent adhesive layer" is the seamless effect at the boundary between the light-shielding layer 6 and the transparent adhesive layer 7 when the display is turned off, assuming that the light-shielding layer 6 and the transparent adhesive layer 7 are adjacent to each other.

[0090] [Color difference △E] The color difference △E between the colored layer 8 or the transparent adhesive layer 7 with respect to the light-shielding layer 6 was measured. For the measurement of the color difference △E, an ultraviolet-visible-near-infrared spectrophotometer (ARSV-LS901, manufactured by JASCO Corporation) was used. The measurement was performed with the evaluation image display device set so that the measurement light entered from both sides of the cover panel 2 and was in a direction that matched the point to be measured. The measurement mode was the reflectance measurement mode, the measurement temperature was 25 °C, and the color tones L * , a * , b * were measured, and the color difference △E was calculated from the following formula 1. The results are shown in Table 2.

[0091]

Equation

[0092] In formula 1, L1 * , a1 * , b1 * represent the measurement results of the light-shielding layer 6 part, and L2 * , a2 * , b2 * represent the measurement results of the colored layer 8 or the transparent adhesive layer 7 part.

[0093] [Table 2]

[0094] The results shown in Table 2 indicate that the colored layer 8, with a transmittance of 60% or less for light with a wavelength of 550 nm, can make the boundary between the light-shielding layer 6 and the image display area 3 more seamless when the display is not lit. In particular, it was found that the colored layer 8 preferably has a transmittance of 15-60% for light with a wavelength of 550 nm, more preferably 15-56%, and even more preferably around 15%.

[0095] The colored layer 8 had a smaller color difference △E compared to the transparent adhesive layer 7, and it was found that the lower the transmittance of the colored layer 8 to light at a wavelength of 550 nm, the smaller the color difference △E tended to be. Furthermore, it was found that a color difference △E of less than 1.9 tended to result in a good seamless effect.

[0096] Furthermore, it was found that by providing a transparent adhesive layer 7 at a position corresponding to the image display area 3, the brightness of the image display area 3 can be maintained when the display is lit.

[0097] Thus, it has been found that the image display device according to this technology makes the boundary between the light-shielding layer 6 and the image display area 3 seamless when the display is not lit, and maintains the brightness of the image display area 3 when the display is lit. [Explanation of Symbols]

[0098] 1. Image display device, 2 cover panels, 3 Image display area, 4 Image Panels, 5 adhesive layer, 6 light shielding layer, 7 transparent adhesive layer, 8 colored layer, 9 hidden area, 10. Boundary between the light-shielding layer and the image display area, 11. Composition for transparent adhesive layer, 12. Boundary between the colored layer and the transparent adhesive layer, 13 Compositions for colored layers, 20 Image display devices, 30 Image display devices, 40 Image display devices, 40A Image Display Device, 41. Vehicle instrument panel, 42 Housing, 43. Inkjet device, 44 Composition film for colored layer, 45 light source, 46 Composition film for transparent adhesive layer, 100 image display devices, 101 Cover Panel, 102 Light blocking layer, 103 Image display area, 104 Boundary between light-shielding layer and image display area

Claims

1. Cover panel and, An image panel having an image display area and a hidden area, A light-shielding layer provided at a position corresponding to the periphery of the non-display area of ​​the cover panel, The cover panel comprises an adhesive layer that joins the light-shielding layer side with the image panel, The adhesive layer is A transparent adhesive layer is provided at a position corresponding to the image display area, An image display device comprising a colored layer that is in contact with the light-shielding layer and the transparent adhesive layer, and is provided around the transparent adhesive layer, the colored layer having a higher transmittance to light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance to light with a wavelength of 550 nm than the transparent adhesive layer.

2. The light-shielding layer has a transmittance of 0% for light with a wavelength of 550 nm. The colored layer has a transmittance of 60% or less for light with a wavelength of 550 nm. The image display device according to claim 1, wherein the transparent adhesive layer has a transmittance of 70% or more for light with a wavelength of 550 nm.

3. The image display device according to claim 1 or 2, wherein the transparent adhesive layer has a transmittance of more than 80% for light with a wavelength of 550 nm.

4. The image display device according to claim 1, wherein the transparent adhesive layer has a transmittance of 99% or more for light with a wavelength of 550 nm.

5. The image display device according to claim 1 or 2, wherein the colored layer is formed such that its thickness at the position corresponding to the non-display area decreases continuously or stepwise from the light-shielding layer side toward the transparent adhesive layer side.

6. The image display device according to claim 1 or 2, wherein the transmittance of the colored layer to light with a wavelength of 550 nm on the light-shielding layer side is smaller than the transmittance of the transparent adhesive layer side to light with a wavelength of 550 nm.

7. Step A involves applying a composition for a colored layer to the periphery of the non-display area of ​​an image panel having an image display area and a non-display area, or to the periphery of a light-shielding layer provided at a position corresponding to the periphery of the non-display area of ​​a cover panel, and curing it to form a colored layer. Step B involves applying a composition for a transparent adhesive layer to the inner circumference of the colored layer and curing it to form a transparent adhesive layer. The process includes step C of bonding the light-shielding layer side of the cover panel to the image panel, The transparent adhesive layer is provided at a position corresponding to the image display area, A method for manufacturing an image display device, wherein the colored layer is in contact with the light-shielding layer and the transparent adhesive layer, and is provided around the transparent adhesive layer, and has a higher transmittance to light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance to light with a wavelength of 550 nm than the transparent adhesive layer.

8. The light-shielding layer has a transmittance of 0% for light with a wavelength of 550 nm. The colored layer has a transmittance of 60% or less for light with a wavelength of 550 nm. The method for manufacturing an image display device according to claim 7, wherein the transparent adhesive layer has a transmittance of 70% or more for light with a wavelength of 550 nm.

9. The method for manufacturing an image display device according to claim 7 or 8, wherein the transparent adhesive layer has a transmittance of more than 80% for light with a wavelength of 550 nm.

10. The method for manufacturing an image display device according to claim 7 or 8, wherein in step A and step B, at least one of the composition for the colored layer and the composition for the transparent adhesive layer is applied using an inkjet device.

11. The composition for the colored layer and the composition for the transparent adhesive layer are photocurable compositions. In step A, the composition for the colored layer is cured by light irradiation. The method for manufacturing an image display device according to claim 10, wherein in step B, the composition for the transparent adhesive layer is cured by light irradiation.

12. A vehicle instrument panel comprising an image display device according to claim 1 or 2, incorporated within a black housing.

Images