Image display device and method for manufacturing image display device

Abstract

Provided are: an image display device with which it is possible to make visibility of a boundary between a light-shielding layer 6 and an image display area 3 more seamless when a display is turned off, and to maintain luminance of the image display area 3 when the display is turned on; and a method for manufacturing the image display device.　An 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 a peripheral edge 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 and the image panel 4. The adhesive layer 5 is provided with 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, is provided surrounding the transparent adhesive layer 7, and has a higher transmittance for light having a wavelength of 550 nm than the light-shielding layer 6 and a lower transmittance for light having a wavelength of 550 nm than the transparent adhesive layer 7.

Description

Image display device and method for manufacturing the same

[0001] This application claims priority from Japanese Patent Application No. 2024-155356, filed in Japan on September 9, 2024, and is incorporated herein by reference.

[0002] In recent years, there has been an increasing demand for a more luxurious interior space in vehicles. For example, there is a demand for displays (image panels) to blend seamlessly with the surrounding instrument panel when the display is not lit, i.e., when the display is not in operation.

[0003] FIG. 10 is a plan view showing an example of a conventional image display device 100. In the image display device 100, a boundary 104 between a light-shielding layer 102 of a cover panel 101 (top cover) and an image display area 103 of an image panel is easily visible, and a sense of unity is not created. As such, there is a demand for making the visibility of the boundary 104 more seamless when the display is off. In addition to making the visibility of the boundary 104 more seamless when the display is off, there is also a demand for maintaining the brightness of the image display area 103 when the display is on (when the display is operating).

[0004] Patent document 1 describes a vehicle display device that can display display areas displayed on different display units with a good sense of seamlessness, in which a cover glass is provided at a position along the boundary between the first display area and the second display area, and has a gradation 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 areas when the display is turned on, but does not make the boundary between the light-shielding layer and the image display area seamlessly visible when the display is turned off.

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

[0007] However, the technology described in Patent Document 2 uses a light-blocking printed layer in the gradation area to perform the gradation process, which raises concerns that unless it is used in combination with a light-reducing (smoke) overcoat resin with low transmittance, diffused reflections may prevent the seamless effect from being achieved. Also, because the gradation area and the overcoat layer in the image display area are integrated, there is a concern that the brightness of the image may be significantly reduced when the display is turned on.

[0008] JP 2024-048141 A JP 2019-086378 A

[0009] The present technology has been proposed in consideration of the current situation, 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 seamlessly visible when the display is off, while maintaining the brightness of the image display area when the display is on.

[0010] The image display device according to the present technology includes 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 bonds the light-shielding layer side of the cover panel to the image panel, and the adhesive layer includes 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, the colored layer having a higher transmittance for light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance for light with a wavelength of 550 nm than the transparent adhesive layer.

[0011] A method for manufacturing an image display device according to the present technology includes the steps of: Step A: applying a composition for a colored layer to a peripheral portion of a non-display region of an image panel having an image display region and a non-display region, or to a peripheral portion of a light-shielding layer provided at a position corresponding to the periphery of the non-display region of a cover panel, and curing the composition to form a colored layer; Step B: applying a composition for a transparent adhesive layer to an inner peripheral portion of the colored layer, and curing the composition to form a transparent adhesive layer; and Step C: 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 region, 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 for light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance for light with a wavelength of 550 nm than the transparent adhesive layer.

[0012] This technology makes the boundary between the light-blocking layer and the image display area seamlessly visible when the display is off, and can maintain the brightness of the image display area when the display is on.

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

[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 region 3 and a non-display region 9, an adhesive layer 5 bonding the light-shielding layer 6 side of the cover panel 2 to the image panel 4, and a light-shielding layer 6 provided at a position corresponding to the periphery of the non-display region 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 the transparent adhesive layer 7 and the colored layer 8. The first adhesive layer 7 is provided at a position corresponding to the image display region 3. The colored layer 8 is provided at a position corresponding to the non-display region 9, is in contact with the light-shielding layer 6 and the transparent adhesive layer 7, and is provided around the transparent adhesive layer 7. The colored layer 8 has a higher transmittance for light with a wavelength of 550 nm than the light-shielding layer 6 and a lower transmittance for light with a wavelength of 550 nm than 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 when the light-shielding layer 6 and the transparent adhesive layer 7 are adjacent to each other, the image display device 1 has a more gradation formed from the light-shielding layer 6 to the transparent adhesive layer 7. As a result, for example, when a user views the image display device 1 from viewing direction D in FIG. 2 with the display of the image display device 1 turned off, the boundary between the light-shielding layer 6 and the image display region 3 becomes less visible. In such an image display device 1, the colored layer 8 can make the visibility of the boundary between the light-shielding layer 6 and the image display region 3 in viewing direction D with the display turned off more seamless. Whether the visibility of the boundary between the light-shielding layer 6 and the image display region 3 with the display turned off is seamless can be evaluated by the method described in the examples below.

[0016] Whether the visibility of the boundary between the light-shielding layer 6 and the image display area 3 when the display is off is seamless can be determined, for example, by referring to the color difference ΔE of the colored layer 8 when the light-shielding layer 6 is used as a reference. For example, if the color difference ΔE is less than 1.9, the visibility of the boundary between the light-shielding layer 6 and the image display area 3 when the display is off tends to be seamless. The color difference ΔE can be measured by the method described in the examples below.

[0017] 2 , the image display device 1 is provided with the transparent adhesive layer 7 at a position corresponding to the image display region 3, and therefore the brightness of the image display region 3 can be maintained when the display is turned on. Therefore, the image display device 1 does not require measures to improve brightness by increasing the current of, for example, a backlight or an OLED (Organic Light Emitting Diode), and can suppress a decrease in the lifespan of the backlight or OLED and an increase in power consumption.

[0018] In this way, the image display device 1 can make the boundary between the light-shielding layer 6 and the image display area 3 more seamlessly visible when the display is off, and can maintain the brightness of the image display area 3 when the display is on.

[0019] [Cover Panel] The cover panel 2 is optically transparent and is laminated to the image panel 4 via the 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 may be any material that is light-transmitting enough to make the image formed on the image panel 4 visible, and examples thereof include glass and resin materials such as acrylic resin, polyethylene terephthalate, polyethylene naphthalate, and polycarbonate. These materials may be subjected to hard coating treatment, anti-reflection treatment, etc. on one or both sides. Furthermore, for example, if the image panel 4 is a touch panel, part of the components of the touch panel may be used as the cover panel 2.

[0021] Furthermore, in order to improve the brightness and contrast of the displayed image, the cover panel 2 is provided with a black frame-shaped light-shielding layer 6, known as a black matrix, 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 paint colored black or the like by screen printing or the like, and then drying and curing it. The thickness of the light-shielding layer 6 can be, for example, 5 to 100 μm. It is preferable that 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 is set appropriately depending on 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 surface shape, such as a concavely curved shape in one direction, a convexly curved shape, a paraboloid of revolution, a hyperbolic paraboloid, or other quadratic surface shape, and may further have a flat portion in part of the curved shape or quadratic surface shape. The dimensional characteristics such as the shape and thickness of the cover panel 2, and physical properties such as elasticity, can be determined appropriately depending on 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 the image panel 4 include image display members such as a liquid crystal display panel, an organic EL display panel, a plasma display panel, and a touch panel. 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 image panel 4 on the cover panel 2 side is not particularly limited, and is preferably flat, for example. A polarizing plate may also be disposed 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, approximately 1 to 3 mm.

[0024] [Adhesive Layer] The adhesive layer 5 bonds 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 includes a transparent adhesive layer 7 and a colored layer 8.

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

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

[0027] The transparent adhesive layer 7 is formed by curing a composition 11 for a transparent adhesive layer, for example, a photocurable composition (photocurable resin composition). The composition 11 for a 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 composition 11 for a transparent adhesive layer preferably has a viscosity of 1 mPa·s or more at 25°C, and may be 10 mPa·s or more, or may be 1 to 30 mPa·s, or may be 3 to 20 mPa·s.

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

[0029] Component (A) is a film-forming component for the optically transparent adhesive layer 7, and may be an acrylic oligomer or an acrylic polymer. Examples of acrylic oligomers include (meth)acrylate oligomers having a polyisoprene, polyurethane, polybutadiene, or the like skeleton. In this specification, the term "(meth)acrylate" encompasses acrylate and methacrylate. Examples of (meth)acrylate oligomers having a polyisoprene skeleton include esters of maleic anhydride adducts of polyisoprene polymers and 2-hydroxyethyl methacrylate (UC102 (molecular weight in polystyrene equivalent: 17,000), UC203 (molecular weight in polystyrene equivalent: 35,000), and 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 Allnex Corporation, and UA-1, manufactured by Light Chemical Co., Ltd.). Examples of acrylic polymers include (meth)acrylate polymers that do not have a (meth)acroyl group. For example, these include (meth)acrylate polymers that do not have a (meth)acroyl group and have a hydroxyl value of 120 mg KOH / g or more, more preferably 170 mg KOH / g or more. By using such a base component, for example, plasticity can be imparted to the cured product, and good film-forming properties (film-forming retention) and adhesive properties can be ensured.

[0030] The hydroxyl value of a (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 1 g of the polymer. Therefore, a larger hydroxyl value indicates a larger number of hydroxyl groups. By setting the hydroxyl value of the (meth)acrylate polymer of component (A) to, for example, 120 mg KOH / g or more, it is possible to prevent a decrease in the crosslink density of the cured product of the photocurable resin composition, and to prevent a decrease in the modulus of elasticity, particularly at high temperatures. Furthermore, the hydroxyl value of the (meth)acrylate polymer is preferably, for example, 400 mg KOH / g or less, more preferably 350 mg KOH / g or less, from the viewpoint of preventing the crosslink density of the cured product of the composition 11 for the transparent adhesive layer from becoming too high and losing flexibility. Furthermore, by using a (meth)acrylate polymer of component (A) that does not have a (meth)acroyl group, it is possible to prevent excessive incorporation of the (meth)acroyl group into the main chain of the polymer chain formed from the (meth)acrylate monomers of components (B) and (C).

[0031] When a (meth)acrylate polymer is contained as component (A), if the weight-average molecular weight Mn of the (meth)acrylate polymer is too small, the number of molecules without hydroxyl groups increases, tending to increase the risk of bleeding, etc., so it is preferably 5,000 or more, more preferably 100,000 or more. Furthermore, if the weight-average molecular weight Mn of the (meth)acrylate polymer of component (A) is too large, it tends to increase viscosity and cause ejection defects, 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) (based on standard polystyrene molecular weight).

[0032] Furthermore, if the dispersity (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 more, and if it is too high, undesirable polymer components with relatively low molecular weights will be mixed in, so it is preferably 10 or less.

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

[0034] The hydroxyl group-containing (meth)acrylate monomer, which is a monomer unit constituting the (meth)acrylate polymer of component (A), is a (meth)acrylate having one or more hydroxyl groups in the molecule, and specific examples thereof 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, and cyclohexyldimethanol mono(meth)acrylate. Among these, 2-hydroxyethyl (meth)acrylate is preferred in terms of polarity control and cost.

[0035] Examples of the hydroxyl group-free (meth)acrylate monomer that can constitute the (meth)acrylate polymer of component (A) are preferably, for example, straight-chain or branched monofunctional (meth)acrylic acid alkyl esters in which the alkyl group has 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, and tridecyl (meth)acrylate.

[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 viewpoints of availability and feasibility of achieving the effects of the invention. Isobornyl acrylate may be further copolymerized.

[0037] When the composition 11 for the transparent adhesive layer contains component (A), the content of component (A) in the composition 11 for the transparent adhesive layer can be changed depending on the amounts of the other components (B), (C), and (D). For example, the composition 11 for the transparent adhesive layer does not need to contain component (A). Furthermore, when the composition 11 for the transparent adhesive layer contains component (A), the content of component (A) in the composition 11 for the transparent adhesive layer can be, for example, 1% by mass or more, or even 10% by mass or more. Furthermore, the content of component (A) in the composition 11 for the transparent adhesive layer can be 55% by mass or less, or even 45% by mass or less.

[0038] The transparent adhesive layer composition 11 preferably contains, as component (B), a hydroxyl-containing monofunctional (meth)acrylate monomer as a polymerization component. The presence of a hydroxyl group enhances affinity with a hydroxyl-containing (meth)acrylate polymer when component (A) contains a hydroxyl-containing (meth)acrylate polymer, and also improves reliability in high-temperature, high-humidity environments. In this case, although multiple hydroxyl groups may be present in the monomer molecule, it is preferred that one hydroxyl group be present in the monomer molecule.

[0039] Specific examples of the hydroxyl group-containing monofunctional (meth)acrylate monomer of component (B) include the same monomers as the hydroxyl group-containing (meth)acrylate monomers that can constitute the (meth)acrylate polymer of component (A), of which 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 the hydroxyl group-containing monofunctional (meth)acrylate monomer of component (B) is preferably 1% by mass or more, more preferably 5% by mass or more, since if it is too small, the reliability tends to be insufficient in high-temperature, high-humidity environments; if it is too large, the polarity balance of the resin before or after curing is disrupted, and the composition tends to become opaque, so it is preferably 30% by mass or less, more preferably 25% by mass or less.

[0041] The transparent adhesive layer composition 11 preferably contains a non-hydroxyl group-containing monofunctional (meth)acrylate monomer as a polymerization component as component (C). The reason why a non-hydroxyl group-containing monomer is preferred is that the adhesiveness and viscosity of the cured product (transparent adhesive layer 7) of the transparent adhesive layer composition 11 can be set within better ranges, and the performance of the transparent adhesive layer 7 can be further improved.

[0042] Specific examples of the non-hydroxyl group-containing monofunctional (meth)acrylate monomer of component (C) include the same monomers as the non-hydroxyl group-containing (meth)acrylate monomers that can constitute the (meth)acrylate polymer of component (A). For example, at least one selected from isobornyl acrylate, isostearyl (meth)acrylate, phenoxy polyethylene glycol acrylate, and ethyl carbitol (meth)acrylate is preferred, and these may also be used in combination.

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

[0044] A known photoradical polymerization initiator can be used as the photopolymerization initiator, component (D), in the transparent adhesive layer composition 11. In particular, it is preferable that component (D) contains a hydrogen abstraction photopolymerization initiator, and the hydrogen abstraction photopolymerization initiator may be used in combination with another photopolymerization initiator (for example, an intramolecular cleavage photopolymerization initiator).

[0045] As the hydrogen abstraction photopolymerization initiator, known hydrogen abstraction photopolymerization initiators can be used, for example, diaryl ketones such as benphenone, and phenyl glyoxylates such as methyl benzoyl formate, etc. A preferred example is methyl benzoyl formate, which is non-yellowing and has a 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, since if it is too small, insufficient crosslinking tends to occur; if it is too large, it tends to cause a deterioration in 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) in order to improve the reaction rate and maintain the high-temperature elastic modulus. Specific examples of polyfunctional (meth)acrylate monomers include bifunctional or higher 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 may have other functional groups such as hydroxyl groups as long as they do not impair the effects of the present technology. Among these, a preferred specific example of the 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 content of component (E) in the composition 11 for the transparent adhesive layer is preferably 0.05% or more, more preferably 0.1% or more, since if the content is too small, the composition tends to have a low crosslinking density, and if the content is too large, the composition tends to become brittle, so the content is preferably 5% by mass or less, more preferably 3% by mass or less.

[0048] In addition to the above-described components (A) to (D), the composition 11 for the transparent adhesive layer may contain various additives within a range that does not impair the effects of the present technology. For example, as a plasticizer (liquid plasticizing component) for reducing cure shrinkage, polybutadiene-based plasticizers, polyisoprene-based plasticizers, phthalate ester-based plasticizers, adipate ester-based plasticizers, polyisoprene-based plasticizers, polyether-based plasticizers, and the like may be used. Furthermore, as a tackifier for improving tackiness, terpene-based resins, rosin resins, petroleum resins, and the like may be used. Furthermore, as a chain transfer agent for adjusting the molecular weight of the cured product, 2-mercaptoethanol, lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-ethylhexyl thioglycolate, 2,3-dimethylcapto-1-propanol, α-methylstyrene dimer, and the like may be used. If necessary, general additives such as adhesion improvers such as silane coupling agents, antioxidants, leveling agents (surface conditioners), and ultraviolet 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 mass% for component (A), 1 to 30 mass% for component (B), 30 to 90 mass% for component (C), and 0.1 to 10 mass% for component (D). The content of each component in the composition 11 for the transparent adhesive layer can also be, for example, 10 to 25 mass% for component (B), 65 to 75 mass% for component (C), 1 to 5 mass% for component (D), 0.05 to 3 mass% for component (E), and 5 mass% or less for other components.

[0050] [Colored Layer] The colored layer 8 is provided in a position corresponding to the non-display region 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 FIG. 2 , the colored layer 8 covers a portion of the surface of the light-shielding layer 6 facing the image panel 4 at a position corresponding to the non-display region 9 and is formed between the image panel 4 and the cover panel 2. The colored layer 8 is preferably formed in an area other than the image display region 3. The width of the colored layer 8 visible when the image display device 1 is viewed from the viewing direction D in FIG. 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 order to avoid affecting the brightness of the image display region 3 when the display is turned on, and is preferably not too small in order to ensure more seamless visibility of the boundary between the light-shielding layer 6 and the image display region 3 when the display is turned off. For example, the width between the boundary 10 and the boundary 12 can be about 1 to 3 mm.

[0051] From the viewpoint of achieving more seamless visibility of the boundary between the light-shielding layer 6 and the image display region 3 when the display is off, the colored layer 8 is not particularly limited as long as it has a higher transmittance for light with a wavelength of 550 nm than the light-shielding layer 6 and a lower transmittance for light with a wavelength of 550 nm than the transparent adhesive layer 7. For example, the colored layer 8 preferably has a transmittance for light with a wavelength of 550 nm of 60% or less, but may also have a transmittance of 56% or less, 50% or less, 34% or less, 20% or less, 15 to 60%, 15 to 56%, 20 to 60%, 20 to 50%, or 15 to 20%. For example, when the colored layer 8 has a transmittance for light with a wavelength of 550 nm of 60% or less, the visibility of the boundary between the light-shielding layer 6 and the image display region 3 when the display is off can be more seamless. Furthermore, the colored layer 8 is not particularly limited in terms of the lower limit of the transmittance of light with a wavelength of 550 nm, and may be, for example, 1% or more, 5% or more, or 10% or more. However, 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, formed by curing a composition 13 for the colored layer. The composition 13 for the colored layer is, for example, a photocurable composition (photocurable resin composition). The composition 13 for the colored layer is obtained by adding a colorant, for example, a black pigment, to the above-described composition 11 for the transparent adhesive layer. The composition 13 for the colored layer can have the same configuration as the composition 11 for the transparent adhesive layer, except that it contains a colorant. The content of the black pigment, an example of a colorant, in the 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 but less than 0.85% by mass, or may be 0.19 to 0.80% by mass.

[0053] The optimum value of the transmittance of the colored layer 8 for light with a wavelength of 550 nm differs depending on the color of the light-shielding layer 6 and the color of the image display area 3 when the display is off. Because the color of the light-shielding layer 6 and the color of the image display area 3 when the display is off differ depending on the materials used and the design, it is preferable that the optimum value of the transmittance of the colored layer 8 for light with a wavelength of 550 nm can be easily adjusted. 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 (e.g., the content of the colorant) of the composition 13 for the colored layer or the thickness of the colored layer 8.

[0054] 3 is a cross-sectional view showing an example of an image display device 20 according to the present technology. The image display device 20 has a similar configuration to the image display device 1, except that the thickness of the colored layer 8 at a position corresponding to the non-display region 9 (the length of the colored layer 8 in the viewing direction D) 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 a position corresponding to the non-display region 9. In this way, the image display device 20 has the colored layer 8 and the transparent adhesive layer 7 laminated together at a position corresponding to the non-display region 9. As in the image display device 20, the transmittance of the colored layer 8 for 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 so that the thickness of the colored layer 8 at a 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 so that the thickness of the colored layer 8 at a 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] 4 is a cross-sectional view showing an example of an image display device 30 according to the present technology. The image display device 30 has a configuration similar to that of the image display device 1, except that the thickness of the colored layer 8 at a position corresponding to the non-display region 9 is formed so as to continuously decrease, starting from the boundary 10, from the light-shielding layer 6 side toward the transparent resin layer 7 side (the image display region 3 side). By continuously changing the thickness of the colored layer 8 at a position corresponding to the non-display region 9 as in the image display device 30, the transmittance of the adhesive layer 5 for light with a wavelength of 550 nm on the light-shielding layer 6 side can be made smaller than the transmittance of the adhesive layer 5 for light with a wavelength of 550 nm on the transparent resin layer 7 side, and a more gradation is formed from the light-shielding layer 6 to the transparent adhesive layer 7, thereby making the visibility of the boundary between the light-shielding layer 6 and the image display region 3 more seamless when the display is not lit. The thickness of colored layer 8 at a position corresponding to non-display area 9 may be formed so as to continuously decrease from the light-shielding layer 6 side toward the transparent resin layer 7 side, starting from the area between boundary 10 and boundary 12 (for example, the center between boundary 10 and boundary 12) in image display device 1. Furthermore, the thickness of colored layer 8 at a position corresponding to non-display area 9 may be formed so as to decrease continuously and in stages 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 with each other on the cover panel 2 side. In the image display device 30, the width of the transparent adhesive layer 7 is larger 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] In the image display device 1, the thickness of the colored layer 8 at a position corresponding to the non-display region 9 may be formed so as to gradually decrease from the light-shielding layer 6 side toward the transparent adhesive layer 7 side. FIG. 5 is a cross-sectional view showing an example of an image display device 40 according to the present technology. FIG. 6 is a cross-sectional view showing an example of an image display device 40A according to the present 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 a position corresponding to the non-display region 9 is formed so as to gradually decrease 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 region 9 as in the image display devices 40 and 40A, the transmittance of the adhesive layer 5 for light with a wavelength of 550 nm on the light-shielding layer 6 side can be made smaller than the transmittance of the adhesive layer 5 for light with a wavelength of 550 nm on the transparent resin layer 7 side, and a more gradual gradation is formed from the light-shielding layer 6 to the transparent adhesive layer 7, thereby making the visibility of the boundary between the light-shielding layer 6 and the image display region 3 more seamless when the display is not lit.

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

[0060] The image display device according to the present embodiment can achieve more seamless visibility of the boundary between the light-shielding layer 6 and the image display area 3 when the display is off, and therefore can be suitably used, for example, as a vehicle instrument panel 41 incorporated in a black housing 42. Furthermore, by using the image display device according to the present embodiment in the vehicle instrument panel 41, the design of the interior space can be improved in various vehicle models, including next-generation vehicle models equipped with OLEDs that provide high image quality and are adaptable to curved surfaces. Furthermore, the image display device according to the present embodiment can maintain the brightness of the image display area 3 when the display is on, and therefore can be suitably used, for example, as a vehicle instrument panel 41 for electric vehicles, in which power consumption is important.

[0061] 9 is a perspective view for explaining an example of a method for manufacturing an image display device according to the present technology. The method for manufacturing an image display device according to the present embodiment includes, for example, the following steps A, B, and C.

[0062] Step A: A composition 13 for a colored layer is applied to the peripheral portion of the light-shielding layer 6 provided 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 cured to form a colored layer 8. Step B: A composition 11 for a transparent adhesive layer is applied to the inner peripheral portion of the colored layer 8, and cured to form a transparent adhesive layer 7. Step C: The light-shielding layer 6 side of the cover panel 2 and the image panel 4 are bonded together.

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

[0064] The inkjet device 43 is, for example, a discharge device that applies a so-called inkjet method, which has one or more discharge heads with a plurality of discharge holes arranged in a predetermined pattern, and ejects fine droplets from the discharge holes to deposit them on the cover panel 2. The inkjet device 43 is capable of applying the composition 13 for the colored layer with higher accuracy in position and size than, for example, a die coater or dispenser. Furthermore, the inkjet device 43 makes it easy to apply the composition 13 for the colored layer in a desired thickness and in a desired pattern, and also has a high application speed.

[0065] The coating thickness of the color layer composition film 44 can be appropriately set depending on the surface conditions of the cover panel 2 and the image panel 4, the required film properties of the adhesive layer 5, and the like. The inkjet device 43 has a discharge head with multiple discharge holes disposed opposite the surface of the cover panel 2, and discharges the color layer composition 13 while moving relative to the cover panel 2. The inkjet device 43 may be provided with multiple discharge heads to adjust the discharge width and projection force. The multiple discharge heads may be arranged in parallel or in a staggered pattern. The color layer composition 13 preferably has a low viscosity that allows it to be discharged by the inkjet device 43.

[0066] When the color layer composition 13 is a photocurable composition, it can be cured by light irradiation. The light irradiation conditions for the color layer composition 13 are preferably set so that the curing rate is at least sufficient to maintain the applied shape of the color layer composition 13. The light source 45 can be any known light source, such as an LED, a UV lamp, a mercury lamp, a metal halide lamp, or a xenon lamp.

[0067] Here, the curing rate is a value defined as the ratio (consumption rate) of the amount of (meth)acryloyl groups present after light irradiation to the amount of (meth)acryloyl groups present in the color layer composition 13 before light irradiation. The larger the value of this curing rate, the more curing has progressed. Specifically, the curing rate is determined by the difference between the baseline and the FT-IR measurement chart of the color layer composition 13 before light irradiation, i.e., the difference between the baseline and the FT-IR measurement chart of the color layer composition 13 at 1640 to 1620 cm. －１ and the absorption peak height (X) of 1640 to 1620 cm from the baseline in the FT-IR measurement chart of composition 13 for the colored layer after light irradiation. －１ and the absorption peak height (Y) of the cured product can be calculated by substituting the above values ​​into the following formula A: Formula A: Cure rate (%) = [(X - Y) / X] x 100

[0068] The conditions for light irradiation in step A, such as the type of light source, output, illuminance, and integrated light amount, are not particularly limited. For example, the curing rate may be limited to a level at which the applied shape of the color layer composition 13 is maintained (so-called provisional curing), or the composition may be completely cured (so-called full curing). Provisional curing refers to a curing rate of the color layer composition 13 after light irradiation of about 40 to 50%. Full curing refers to a curing rate of the color layer composition 13 after light irradiation of 90% or more, or may be 95% or more, or 99% or less.

[0069] In step A, if the desired thickness cannot be obtained by one application using the inkjet device 43, the composition 13 for the color layer may be applied multiple times. In this case, the composition 13 for the color layer may be irradiated with light after the application of the composition 13 for the color layer is performed multiple times.

[0070] Furthermore, in step A, the application of the color layer composition 13 followed by light irradiation may be repeated multiple times. This allows sufficient curing even when a color layer composition 13 with low light transmittance is used, and a color layer 8 with low transmittance to light with a wavelength of 550 nm (e.g., a color layer 8 with a transmittance of less than 15% to light with a wavelength of 550 nm) can be obtained.

[0071] [Step B] In step B (ST2 in FIG. 9 ), it is preferable to apply a composition 11 for a transparent adhesive layer to the inner periphery of the colored layer 8, and then flatten and harden the surface of the composition 11 for a transparent adhesive layer to form the transparent adhesive layer 7. In step B, it is preferable to apply the composition 11 for a transparent adhesive layer using an inkjet device 43 to form a composition film 46 for a transparent adhesive layer. If the composition 11 for a transparent adhesive layer is a photocurable composition, it can be hardened by light irradiation. The method for hardening the composition 11 for a transparent adhesive layer can be the same as that for the composition 13 for a colored layer in step A. In step B, light irradiation after application of the composition 11 for a transparent adhesive layer may be repeated multiple times.

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

[0073] In the method for producing 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 more effectively achieving the effects of the present technology, it is preferable that the manufacturing method of the image display device 1 includes, in step A, applying a photocurable composition 13 for the colored layer using an inkjet device 43 and curing the photocurable composition 13 for the colored layer by light irradiation, and, in step B, applying a photocurable composition 11 for the transparent adhesive layer using the inkjet device 43 and curing the photocurable composition 11 for the transparent adhesive layer by light irradiation.

[0075] The manufacturing method of the image display device 1 described above is premised on applying the composition 13 for the color layer and the composition 11 for the transparent adhesive layer to the surface of the cover panel 2, but is not limited to this example. For example, the composition 13 for the color 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 portion of the non-display area 9), and then the cover panel 2 may be attached.

[0076] In the manufacturing method of the image display device 20 shown in Figure 3, for example, in step A, the colored layer 8 is formed so that the thickness of the colored layer 8 is smaller than that of the image display device 1, and in step B, a composition 11 for a transparent adhesive layer is applied to the inner peripheral portion of the colored layer 8, and then the composition 11 for a 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, and the surface of the composition 11 for a transparent adhesive layer is flattened and cured to form the transparent adhesive layer 7.

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

[0078] In the manufacturing method of the image display device 40, 40A shown in Figures 5 and 6, for example, in step A, a composition 13 for the colored layer is applied to the peripheral portion of the light-shielding layer 6 of the cover panel 2, and a colored layer 8 is formed so that the thickness at the position corresponding to the non-display area 9 gradually decreases 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 peripheral portion of the colored layer 8, and then the surface of the composition 11 for the transparent adhesive layer is flattened and cured, thereby forming the transparent adhesive layer 7.

[0079] In addition, in steps A and B, the colored layer 8 and the transparent adhesive layer 7 may be formed so that the composition 13 for the colored layer and the composition 11 for the transparent adhesive layer are partially mixed in their applied areas.

[0080] Examples of the present technology will be described below. However, the present technology is not limited to these examples. In these examples, an image display device for evaluation having a configuration similar to that of the image display device 1 shown in FIG. 2 was fabricated, and the transmittance of the colored layer 8 of the image display device for evaluation 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. "Resin viscosity" in Table 1 is the viscosity of composition 13 for the colored layer and composition 11 for the transparent adhesive layer at 25°C, and is a value measured using a rheometer (HaakeRheoSress600, Thermo Fisher Scientific; measurement conditions: cone rotor, φ=35 mm, rotor angle 2°, shear rate 120 (1 / s)). In Table 1, the numerical value for the 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]

[0083] The image display device for evaluation was produced by the following method. First, a color layer composition 13 was applied using an inkjet device 43 to the inner periphery of the second adhesive layer on the surface of the cover panel 2 (member name: glass (143 mm × 293 mm) on the side on which the light-shielding layer 6 (black print, outer dimensions 143 mm × 293 mm, inner diameter 103 mm × 253 mm) was formed, to form a color layer composition film 44. Using a UV lamp (manufactured by HOYA Corporation, UV irradiator: H-40AH4), light was irradiated under conditions such that the color layer composition film 44 had a cure rate of 40%. This formed a color layer 8 on the periphery of the cover panel 2.

[0084] A composition 11 for a transparent adhesive layer was applied to the inner periphery of the colored layer 8 using an inkjet device 43 to form a composition film 46 for a transparent adhesive layer. A UV lamp was used to irradiate the composition film 46 for a transparent adhesive layer under conditions such that the cure rate of the composition film 46 for a transparent adhesive layer was 40%. In this way, a transparent adhesive layer 7 was formed.

[0085] The cover panel 2 on which the colored layer 8 and the transparent adhesive layer 7 were formed was then bonded to the image panel 4 (component name: liquid crystal display) so that the cure rate was 90% or higher, thereby obtaining an image display device for evaluation. Furthermore, by varying the content of the pigment dispersion liquid in the colored layer composition 13 within a range of 0.10 to 0.85 mass % and the resin thickness within a range of 50 to 200 μm, image display devices for evaluation with different transmittances of the colored layer 8 for light with a wavelength of 550 nm were obtained, as shown in Table 2.

[0086] [Transmittance] The transmittance of the colored layer 8 for light with a wavelength of 550 nm was measured from the cover panel 2 side of the image display device for evaluation using an ultraviolet-visible spectrophotometer (UV-2600, manufactured by Shimadzu Corporation). The results are shown in Table 2. In Table 2, the "transmittance" of the "transparent adhesive layer" is the measurement result of the transmittance of the transparent adhesive layer 7 for light with a wavelength of 550 nm, which was measured in the same manner as for the colored layer 8. Note that in the image display device for evaluation, the transmittance of the light-shielding layer 6 for light with a wavelength of 550 nm, measured in the same manner as for the colored layer 8, was 0%.

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

[0088] When there was no seamless effect, it was evaluated as "×" (NG), when the seamless effect was poor 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 practice, 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, "-" indicates that the colored layer 8 was not obtained (did not harden) (NG). In Table 2, the "seamless effect" of the "transparent adhesive layer" indicates the seamless effect at the boundary between the light-shielding layer 6 and the transparent adhesive layer 7 when the display is not lit, assuming that the light-shielding layer 6 and the transparent adhesive layer 7 are adjacent to each other.

[0090] [Color difference ΔE] The color difference ΔE of the colored layer 8 or the transparent adhesive layer 7 was measured when the light-shielding layer 6 was used as a reference. A UV-visible-near-infrared spectrophotometer (ARSV-LS901, manufactured by JASCO Corporation) was used to measure the color difference ΔE. The measurement was performed by orienting the measurement light so that it entered from the cover panel 2 side and setting the image display device for evaluation so that it matched the point to be measured. The measurement mode was reflectance measurement mode, the measurement temperature was 25°C, and the color L ＊ , a ＊ , b＊ The color difference ΔE was calculated from the following formula 1. The results are shown in Table 2.

[0091]

[0092] In formula 1, L １ ＊ , a １ ＊ , b １ ＊ indicates the measurement result of the light-shielding layer 6 portion, and L ２ ＊ , a ２ ＊ , b ２ ＊ indicates the measurement results for the colored layer 8 or the transparent adhesive layer 7 portion.

[0093]

[0094] The results shown in Table 2 reveal that when the display is off, the colored layer 8 has a transmittance of 60% or less for light with a wavelength of 550 nm, thereby enabling more seamless visibility of the boundary between the light-shielding layer 6 and the image display area 3. In particular, it was found that the colored layer 8 preferably has a transmittance of 15 to 60% for light with a wavelength of 550 nm, more preferably 15 to 56%, and even more preferably about 15%.

[0095] It was found that the colored layer 8 had a smaller color difference ΔE than the transparent adhesive layer 7, and that the color difference ΔE tended to decrease as the transmittance of the colored layer 8 to light with a wavelength of 550 nm decreased. It was also found that a color difference ΔE of less than 1.9 tended to result in a good seamless effect.

[0096] It was also found that by providing the 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 turned on.

[0097] In this way, it was found that the image display device according to the present technology can make the boundary between the light-shielding layer 6 and the image display area 3 seamlessly visible when the display is off, while maintaining the brightness of the image display area 3 when the display is on.

[0098] DESCRIPTION OF SYMBOLS 1 Image display device, 2 Cover panel, 3 Image display area, 4 Image panel, 5 Adhesive layer, 6 Light-shielding layer, 7 Transparent adhesive layer, 8 Colored layer, 9 Non-display area, 10 Boundary between light-shielding layer and image display area, 11 Composition for transparent adhesive layer, 12 Boundary between colored layer and transparent adhesive layer, 13 Composition for colored layer, 20 Image display device, 30 Image display device, 40 Image display device, 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 device, 101 Cover panel, 102 Light-shielding layer, 103 Image display area, 104 Boundary between light-shielding layer and image display area

Claims

1. An image display device comprising: 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 bonding 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 in contact with the light-shielding layer and the transparent adhesive layer, provided around the transparent adhesive layer, the colored layer having a higher transmittance for light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance for light with a wavelength of 550 nm than the transparent adhesive layer.

2. An image display device as described in claim 1, wherein 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, and 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. An image display device as described in claim 1 or 2, wherein the colored layer is formed so that the 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 colored layer has a lower transmittance for light with a wavelength of 550 nm on the side of the light-shielding layer than on the side of the transparent adhesive layer.

7. A method for manufacturing an image display device, comprising: Step A of applying and curing a composition for a colored layer to the peripheral portion of a non-display area of ​​an image panel having an image display area and a non-display area, or to the peripheral portion of a light-shielding layer provided at a position corresponding to the peripheral edge of the non-display area of ​​a cover panel, thereby forming a colored layer; Step B of applying and curing a composition for a transparent adhesive layer to the inner peripheral portion of the colored layer, thereby forming a transparent adhesive layer; and Step C 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 for light with a wavelength of 550 nm than the light-shielding layer and a lower transmittance for light with a wavelength of 550 nm than the transparent adhesive layer.

8. A method for manufacturing an image display device according to claim 7, wherein 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, and 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 method for manufacturing an image display device according to claim 10, wherein the composition for the colored layer and the composition for the transparent adhesive layer are photocurable compositions, and in step A, the composition for the colored layer is cured by light irradiation, and in step B, the composition for the transparent adhesive layer is cured by light irradiation.

12. A vehicle instrument panel in which the image display device according to claim 1 or 2 is incorporated in a black housing.

Images