Touch sensor with adhesive layer and image display device

Abstract

To provide a touch sensor with an adhesive layer, when being applied to an image display device to display in black and white, having excellent contrast between a black display and a white display and excellent performance of suppressing a decrease in brightness of the white display, and an image display device having the touch sensor with the adhesive layer.SOLUTION: A touch sensor with an adhesive layer includes a touch sensor and an adhesive layer disposed on one surface side of the touch sensor, where the adhesive layer contains a visible-light absorbing material, and the adhesive layer has an internal absorbance Aa calculated by a test X of 0.03 or less and a parameter X of 20 m-1 or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a touch sensor with an adhesive layer and an image display device. [Background technology]

[0002] Conventionally, touch sensors that detect a so-called touch operation, in which a finger or a stylus pen is brought into contact with or in proximity to a screen, have been used in various electronic devices, including portable information devices such as tablet computers and smartphones. Such touch sensors are usually formed on the surface of a substrate and have detection electrodes that detect the touch operation.

[0003] For example, Patent Document 1 discloses a conductive film having a substrate and conductor wiring provided on at least one surface of the substrate, where the conductor wiring has a metal layer and a visibility suppression layer, and the visibility suppression layer has a transparent layer, a chromium-containing layer, and a transparent layer in this order, as well as a touch panel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-182285 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been an increase in the number of image display devices using image display elements that have a high contrast, each having a touch sensor stacked thereon. The present inventors have studied the display performance of an image display device having a touch sensor with reference to the technology disclosed in Patent Document 1, and have found that, compared to an image display device without a touch sensor, when performing black-and-white display in which white and black are simultaneously displayed, the luminance of a black display area adjacent to a white display area tends to increase, and the contrast tends to decrease.

[0006] In view of the above circumstances, an object of the present invention is to provide a touch sensor with an adhesive layer that, when applied to an image display device to display black and white, has excellent contrast between black and white displays and is excellent in performance in suppressing a decrease in brightness of the white display.Another object of the present invention is to provide an image display device having the above touch sensor with an adhesive layer. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above problems and have completed the present invention. That is, they have found that the above problems can be solved by the following configuration.

[0008] [1] A touch sensor with an adhesive layer, comprising a touch sensor and an adhesive layer disposed on one surface side of the touch sensor, wherein the adhesive layer contains a visible light absorbing material, and the adhesive layer has an internal absorbance A calculated by Test X described later. a is 0.03 or less, and the parameter X is 20m -1 This completes the touch sensor with an adhesive layer. [2] The touch sensor with an adhesive layer according to [1], wherein the thickness of the adhesive layer is 300 μm or less. [3] The touch sensor with an adhesive layer according to [1] or [2], wherein the visible light absorbing material is a black pigment, and the content of the black pigment is 5 to 200 ppm by mass relative to the total mass of the adhesive layer. [4] The touch sensor with an adhesive layer according to any one of [1] to [3], wherein the thickness of the adhesive layer is 300 μm or less, the visible light absorbing material is a black pigment, and the content of the black pigment is 5 to 200 ppm by mass with respect to the total mass of the adhesive layer. [5] A touch panel having a touch sensor with an adhesive layer according to any one of [1] to [4]. [6] An image display device comprising an image display element and the touch sensor with the adhesive layer according to any one of [1] to [4]. [7] The image display device according to [6], wherein the image display element is an organic electroluminescence display element. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a touch sensor with an adhesive layer that, when applied to an image display device to display black and white, has excellent contrast between black and white displays and is excellent in performance in suppressing a decrease in brightness of the white display.Furthermore, according to the present invention, it is possible to provide an image display device having the above touch sensor with an adhesive layer. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view schematically illustrating an example of an image display device having a touch sensor with a pressure-sensitive adhesive layer of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the touch sensor with a pressure-sensitive adhesive layer and the image display device of the present invention will be described in detail with reference to the drawings. The following description of the components is based on a typical embodiment of the present invention, and the present invention is not limited to such an embodiment. In addition, the drawings are provided for illustrative purposes only, and the scale of each component may be changed from the actual scale to facilitate visibility or explanation. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits. In this specification, when two or more types of a component are present, the "content" of that component means the total content of those two or more components. Regarding angles, "perpendicular" or "perpendicular" means a range of 90°±5°, and "parallel" means a range of 0°±5°. Similarly, unless otherwise specified, angles expressed as specific numerical values ​​mean that the difference from the exact angle is within 5 degrees. The difference between the above-mentioned perpendicular, perpendicular, and parallel angles and the above-mentioned angles and the exact angle is preferably within 4 degrees, and more preferably within 3 degrees.

[0012] The terms "polymer," "macromolecule," and "polymer" each refer to a compound having a weight-average molecular weight of 2000 or more. Here, the weight-average molecular weight is defined as a polystyrene-equivalent value measured using gel permeation chromatography (GPC) under the following conditions: Equipment: Tosoh Corporation HLC-8320GPC Column: Tosoh TSK-GEL G3000PWXL Column temperature: 35℃ ·Flow rate: 0.5mL / min Calibration curve: Poly sodium acrylate standard manufactured by Sowa Scientific Co., Ltd. Eluent: A mixture of sodium dihydrogen phosphate dodecahydrate / disodium hydrogen phosphate dihydrate (34.5g / 46.2g) diluted to 5000g with purified water.

[0013] The term "main surface" refers to the surface with the largest area in a film-, sheet- or plate-like member. "Visible light" means light in the wavelength range of 380 to 780 nm. The term "transparent" means that the light transmittance in the visible light wavelength range is 40% or more, preferably 60% or more, more preferably 80% or more, and even more preferably 90% or more. The light transmittance is measured using a known transmittance measuring device in accordance with "Plastics - Determination of total luminous transmittance and total luminous reflectance" as defined in JIS K 7375:2008.

[0014] In this specification, the term "acrylic resin" is used to mean either or both of a polymer and a copolymer containing units derived from at least one monomer selected from the group consisting of acrylates and methacrylates.

[0015] [Touch sensor with adhesive layer] The touch sensor with an adhesive layer of the present invention includes a touch sensor and an adhesive layer disposed on one surface side of the touch sensor. Hereinafter, the touch sensor with an adhesive layer of the present invention will be described in detail with reference to the drawings.

[0016] FIG. 1 is a schematic cross-sectional view showing an example of an image display device having a touch sensor with an adhesive layer of the present invention. 1 includes an image display element 30, a touch sensor 20 with an adhesive layer of the present invention, and a protective layer 40 stacked in this order in the stacking direction. The touch sensor 20 with an adhesive layer of the present invention includes a touch sensor 10, an adhesive layer 4 arranged on a surface 10b of the touch sensor 10 facing the image display element 30, and an adhesive layer 5 arranged on a surface 10a of the touch sensor 10 facing the protective layer 40. The touch sensor 10 also has a substrate 1, a detection electrode 11 arranged on one surface of the substrate 1, and a detection electrode 12 arranged on the other surface of the substrate 1. As shown in the figure, an adhesive layer 5 is arranged on a surface 10a of the touch sensor 10 so as to cover the detection electrode 11, and an adhesive layer 4 is arranged on a surface 10b of the touch sensor 10 so as to cover the detection electrode 12. In the image display device 100, an image (not shown) displayed on the display surface 30a of the image display element 30 is visible through the touch sensor 20 with an adhesive layer and the protective layer 40. The surface 40a of the protective layer 40 opposite to the touch sensor 10 is the touch surface of the image display device 100 and serves as the operation surface.

[0017] The touch sensor with an adhesive layer of the present invention comprises a touch sensor and an adhesive layer disposed on one surface side of the touch sensor, the adhesive layer containing a visible light absorbing material, and an internal absorbance A calculated by Test X described below. ais 0.03 or less, and the parameter X is 20m -1 and a pressure-sensitive adhesive layer as described above.

[0018] The mechanism by which the adhesive layer-equipped touch sensor of the present invention exhibits excellent contrast between black and white displays and excellent performance in suppressing a decrease in brightness of the white display when applied to an image display device to display black and white images is not entirely clear, but the inventors speculate as follows. The present inventors have thoroughly investigated the problem of the decrease in contrast in an image display device having a touch sensor laminated on an image display element, and first found that the increase in brightness of the black display and the decrease in contrast are not due to reflection of external light, because an increase in brightness of the black display is observed even in a dark room where no external light is present. Further investigation led them to deduce that the cause of the increase in brightness of the black display is that part of the light emitted from the white display area is scattered or reflected inside the adhesive layer used to laminate the touch sensor on the image display element, transmitted or propagated toward the black display area adjacent to the white display area, and reaches the position where the viewer views the area, resulting in an increase in brightness of the black display. Based on this presumed mechanism, we found that by adding a visible light absorbing material to the adhesive layer placed on the surface of the touch sensor and reducing the light that passes through or propagates inside the adhesive layer, it is possible to significantly suppress the increase in brightness of the black display displayed adjacent to the white display, thereby improving the contrast between the black display and the white display. Furthermore, in the touch sensor of the present invention, the internal absorbance A of the adhesive layer measured by a predetermined test method a and parameter X are each set within a predetermined range. This makes it possible to suppress the reduction in light emitted from the image display element in the white display area and improve contrast without substantially impairing the brightness of the white display, and it is therefore presumed that this will enable the realization of display characteristics that are comparable to those of image display devices that do not have touch sensors.

[0019] In this specification, the expression "the effects of the present invention are excellent" means that when a touch sensor with an adhesive layer is applied to an image display device to display black and white, at least one of the contrast between the black display and the white display and the ability to suppress a decrease in the brightness of the white display is excellent.

[0020] Each of the components of the touch sensor with an adhesive layer of the present invention will be described in more detail. Hereinafter, a pressure-sensitive adhesive layer disposed on one surface side of a touch sensor, which contains a visible light absorbing material and has an internal absorbance A a is 0.03 or less, and the parameter X is 20m -1 The pressure-sensitive adhesive layer described above is also referred to as a "specific pressure-sensitive adhesive layer."

[0021] <Specific adhesive layer> The specific adhesive layer has an internal absorbance A calculated by the following test X. a is 0.03 or less, and the parameter X is 20m -1 That's all. Test X: The visible light reflectance ρ of the support white board is obtained by the method described in JIS R 3106: 2019. Similarly, the visible light reflectance ρ of the laminate obtained by laminating the support white board and the adhesive layer is measured by irradiating the measurement light onto the adhesive layer side of the laminate by the method described in JIS R 3106: 2019. x The visible light reflectance ρ0 and the visible light reflectance ρ x The internal absorbance A of the adhesive layer is calculated from the following equation (1): a Calculate the calculated internal absorbance A a and the thickness of the adhesive layer D a (m) using the following equation (2) to calculate the parameter X(m -1 ) is calculated. Formula (1) A a = -log 10 {(ρ x / ρ0) 0.5} Equation (2) X = A a / D a The support white plate may be a commercially available standard white plate (perfect diffuser plate) for measuring total light spectral reflectance. More specifically, for example, a barium sulfate plate or a Spectralon standard reflector plate may be used. If necessary, a support white plate may be used that is formed by combining a support substrate having a light transmittance of 93% or more with the standard white plate. When a transparent support is combined with the standard white plate, the transparent support is laminated on the standard white plate, and measurement light is directed toward the transparent support side to measure the visible light reflectance ρ0.

[0022] Here, the ratio of the optical intensity of the outgoing light to the optical intensity of the incident light when visible light is incident on the adhesive layer is called the internal transmittance T a Then, the internal absorbance A of the adhesive layer a is expressed by the following formula (3). Formula (3) A a = -log 10 (T a ) In addition, from the measurement method of test X, the internal transmittance T a , the visible light reflectance ρ of the laminate x , and the visible light reflectance ρ0 of the supporting white plate can be considered to satisfy the relationship of the following formula (4). Equation (4) ρ x = T a ×ρ0×T a The above formula (1) is established from the above formulas (3) and (4). In this way, the visible light reflectance ρ of the laminate can be calculated using formula (1). x and the visible light reflectance ρ0 of the supporting white board to the internal absorbance A of the adhesive layer a can be obtained.

[0023] The visible light reflectance ρ of the above supporting white board and the visible light reflectance ρ of the laminate x is obtained by following the measurement and calculation methods for visible light reflectance described in JIS R 3106:2019. A more specific method for carrying out test X will be described in the Examples below.

[0024] The internal absorbance A of the above adhesive layera represents the degree of attenuation of light inside the adhesive layer, and the reflection on both main surfaces of the adhesive layer is the internal absorbance A a and parameter X. The internal absorbance A a and parameter X within the above ranges, it is estimated that it is possible to suppress an increase in the brightness of the black display due to the transmission and propagation of light inside the adhesive layer while maintaining the brightness of the white display transmitted along the lamination direction of the touch sensor with the adhesive layer, thereby improving the contrast between the black display and the white display.

[0025] The internal absorbance A a is preferably 0.0004 to 0.0300, more preferably 0.0010 to 0.0050, in that the effects of the present invention are more excellent. Internal absorbance A a can be adjusted by, for example, the type and content of the visible light absorbing material added to the specific pressure-sensitive adhesive layer, the type of pressure-sensitive adhesive constituting the specific pressure-sensitive adhesive layer, the thickness of the specific pressure-sensitive adhesive layer, etc.

[0026] The parameter X is 20 to 3000 m, which is the point at which the effect of the present invention is more excellent. -1 is preferable, 60 to 1000 m -1 is more preferred. The parameter X can be adjusted, for example, by the type and content of the visible light absorbing material added to the specific pressure-sensitive adhesive layer, the type of pressure-sensitive adhesive constituting the specific pressure-sensitive adhesive layer, the thickness of the specific pressure-sensitive adhesive layer, and the like.

[0027] The specific pressure-sensitive adhesive layer is not particularly limited in terms of its constituent components, as long as it contains a visible light absorbing material and has the function of fixing the touch sensor to other members. The specific pressure-sensitive adhesive layer is preferably transparent and electrically insulating.

[0028] The specific pressure-sensitive adhesive layer preferably has a relative dielectric constant at a frequency of 100 kHz of 4.0 or less, more preferably 3.5 or less, and even more preferably 3.0 or less. The lower limit is not particularly limited, and may be, for example, 2.0 or more. When the specific pressure-sensitive adhesive layer has a relative dielectric constant of 4.0 or less, the layer exhibits superior performance in blocking the effects of electromagnetic noise from components such as image display devices. The relative dielectric constant is determined in accordance with JIS K 6911:2006.

[0029] (visible light absorber) The visible light absorbing material contained in the specific pressure-sensitive adhesive layer may be any substance having absorption wavelength characteristics that absorb visible light (wavelength 380 to 780 nm), and for example, a substance having a maximum absorption wavelength of 380 to 780 nm can be used.

[0030] Examples of visible light absorbers include dyes and pigments, preferably pigments, and more preferably black pigments. Examples of materials constituting the visible light absorbers include carbon materials, organic materials, inorganic oxides, inorganic nitrides, and inorganic oxynitrides. Examples of black pigments include carbon black, graphite, aniline black, cyanine black, black iron oxide, chromium oxide, manganese oxide, titanium nitride, and titanium oxynitride, with titanium nitride or titanium oxynitride being preferred.

[0031] As the pigment, a particulate pigment can be used, and the shape thereof is not particularly limited. To prevent the display function of the display from being impaired by light scattering, the average primary particle size of the pigment is preferably 500 nm or less, more preferably 200 nm or less, and even more preferably 100 nm or less. There is no particular lower limit, but a value of 10 nm or more is preferred. The average primary particle size of a pigment is obtained by measuring the equivalent sphere diameter of 100 objects and calculating the arithmetic mean. The equivalent sphere diameter refers to the diameter of a spherical particle with the same volume. However, when using commercially available pigments, the catalog value is used as the average primary particle size.

[0032] The visible light absorbing material may be used alone or in combination of two or more. The content of the visible light absorbing material (preferably a black pigment) is preferably 0.1 to 500 ppm by mass, more preferably 5 to 200 ppm by mass, relative to the total mass of the specific pressure-sensitive adhesive layer, in terms of achieving better effects of the present invention.

[0033] The specific pressure-sensitive adhesive layer preferably contains a pressure-sensitive adhesive. Examples of adhesives used in the specific adhesive layer include optically clear adhesives (OCA: Optical Clear Adhesives) and optically clear resins (OCR: Optical Clear Resins) such as UV (Ultra Violet) curable resins. Examples of OCA and OCR include (meth)acrylic resins, urethane acrylate resins, urethane resins, rubber resins, epoxy resins, epoxy acrylate resins, oxetane resins, silicone resins, silicone acrylic resins, polyester resins, polyether resins (such as polyvinyl ether), polyamide resins, fluorine-containing resins, vinyl acetate / vinyl chloride copolymers, and modified polyolefins. The above resins may be used alone or in combination of two or more. Among these, (meth)acrylic resins are preferred in terms of weather resistance and cost.

[0034] The content of the adhesive in the specific adhesive layer is preferably 85% by mass or more, more preferably 90% by mass or more, based on the total mass of the specific adhesive layer. The upper limit is not particularly limited and may be, for example, 99% by mass or less. The content of the adhesive in the specific adhesive layer may be the remainder of the visible light absorber and any additives.

[0035] The specific pressure-sensitive adhesive layer may contain any additives within the range that does not impair the function as a pressure-sensitive adhesive layer or the effects of the present invention. Additives include crosslinkers, UV absorbers, plasticizers, antistatic agents and corrosion inhibitors.

[0036] Thickness of specific adhesive layer D aIn terms of achieving better effects of the present invention, the thickness is preferably 500 μm or less, more preferably 300 μm or less, even more preferably 150 μm or less, and particularly preferably 100 μm or less. The lower limit is not particularly limited, and may be, for example, 10 μm or more. Adhesive layer thickness D a The thickness D of the adhesive layer can be measured using a linear gauge (for example, manufactured by Mitutoyo Corporation). a The method for measuring this will be described in detail in the Examples below.

[0037] The specific pressure-sensitive adhesive layer can be formed by any of various known methods. Examples of methods for forming the specific adhesive layer include a method (application method) in which an adhesive composition containing a visible light absorber and an adhesive is applied to the surface on which the detection electrode of the touch sensor is arranged to form the specific adhesive layer, and a method (transfer method) in which the specific adhesive layer is formed on a temporary support using the above-mentioned adhesive composition, and then the specific adhesive layer is transferred to the surface on which the detection electrode of the touch sensor is arranged. Among these, the transfer method is preferred in that the yield of touch sensors with an adhesive layer can be increased by separately producing and inspecting the touch sensor and the specific adhesive layer and using only non-defective products. The coating film of the pressure-sensitive adhesive composition formed on the surface of the touch sensor or the temporary support may be subjected to a drying treatment, if necessary. Known methods can be used for both the method of applying the pressure-sensitive adhesive composition and the drying treatment of the coating film.

[0038] The PSA composition used to form the PSA layer contains, for example, a PSA and a visible light absorbing material. The PSA composition may further contain the additives described above. The PSA composition may also contain coating aids such as a solvent, a surfactant, and a thickener. The pressure-sensitive adhesive composition preferably further contains a solvent. Examples of the solvent include water and organic solvents, and a solvent capable of dissolving or dispersing the pressure-sensitive adhesive and components such as the visible light absorbing material is appropriately selected. When the PSA composition contains a solvent, the solid content of the PSA composition is preferably 5 to 60 mass %, more preferably 10 to 50 mass %. The "solid content" of the PSA composition refers to the components constituting the PSA layer formed using the PSA composition, and when the PSA composition contains a solvent, it refers to all components excluding the solvent. Liquid components that form the PSA layer are also considered to be solids.

[0039] <Touch sensor> The touch sensor is not particularly limited as long as it functions as a sensor that detects a touch operation, and examples thereof include a conductive substrate having a substrate and a detection electrode disposed on at least one surface of the substrate. A specific example of a touch sensor is a touch sensor 10 having a substrate 1, a detection electrode 11 arranged on one surface of the substrate 1, and a detection electrode 12 arranged on the other surface of the substrate 1, as shown in Figure 1. The touch sensor is not limited to the embodiment shown in Fig. 1. For example, the sensing electrodes may be disposed on only one surface of the substrate.

[0040] (base material) The substrate is a member having a function of supporting the detection electrode. The substrate is not particularly limited, but a resin substrate is preferred. Examples of materials that can be used to form the substrate include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), diacetate resins, triacetate resins, acrylic resins, polycarbonate resins, triacetyl cellulose, polystyrene, polyolefins, polyurethane resins, polyvinyl chloride, polyimide resins, and polyamide resins. As the substrate, a film made of polyester resin is preferred in terms of ease of production, and polyethylene terephthalate, polyethylene-2,6-naphthalate, or poly(1,4-cyclohexylene dimethylene terephthalate) is more preferred in terms of the balance between mechanical properties and cost. The substrate may be a single layer of the above resin, or a composite film composed of a plurality of resin layers.

[0041] In addition to the above resin, the substrate may further contain additives such as a light stabilizer, an antioxidant, an ultraviolet absorber, a flame retardant, a lubricant (fine particles), a nucleating agent (crystallization agent), and a crystallization inhibitor. The substrate may further include a visible light absorbing material.

[0042] The substrate may have an undercoat layer on at least one of its two main surfaces, i.e., the substrate may have a multi-layer structure consisting of a support and an undercoat layer. When the substrate has a multilayer structure consisting of a support and an undercoat layer, the undercoat layer is preferably disposed on the surface of the substrate on which the detection electrode is provided. The undercoat layer may be disposed on both sides of the support. As the support forming a multilayer structure with the undercoat layer, the materials listed above as the base material can be used. Examples of materials that form the undercoat layer include a binder resin and a surfactant.

[0043] The thickness of the substrate is, for example, 400 μm or less, preferably 150 μm or less, more preferably 110 μm or less, even more preferably 60 μm or less, particularly preferably 40 μm or less, and more preferably 10 μm or more in terms of superior strength of the touch sensor. When the substrate has the above-mentioned undercoat layer, the thickness of the substrate also includes the thickness of the undercoat layer. The thickness of the substrate can be measured using a linear gauge (for example, manufactured by Mitutoyo Corporation). The method for measuring the thickness of the substrate will be described in detail in the Examples below.

[0044] (detection electrode) The detection electrode is made up of a plurality of thin conductive wires, and functions as a sensor electrode for detecting a touch operation. The touch sensor preferably has a plurality of detection electrodes extending along a first in-plane direction on one surface of the substrate, and a plurality of detection electrodes extending along a second in-plane direction perpendicular to the first in-plane direction on the other surface of the substrate. Only one detection electrode may be disposed on one surface of the substrate. Alternatively, only one detection electrode may be disposed on one surface of the substrate.

[0045] The detection electrode may have a predetermined pattern formed by conductive thin wires. The pattern to be formed is not particularly limited, but a mesh-like shape (mesh pattern) is more preferable. The mesh-like shape refers to a shape including a plurality of openings (grids) formed by intersecting conductive thin wires. The shape of the mesh pattern of the detection electrode may be a triangle such as an equilateral triangle, an isosceles triangle, or a right-angled triangle; a quadrangle such as a square, a rectangle, a rhombus, a parallelogram, or a trapezoid; a regular n-gon such as a regular hexagon or a regular octagon; a circle; an ellipse; or a star, or other geometric shape. The shape of one side of the opening may be straight, curved, or arc-shaped. For example, when the shape is arc-shaped, two opposing sides may be arc-shaped outwardly convex, and the other two opposing sides may be arc-shaped inwardly convex. Each side may also be wavy, consisting of a series of arcs converging outward and inward. Of course, each side may be sine-curved. The mesh pattern is not particularly limited and may be a random or regular pattern, or may be a regular mesh pattern in which multiple congruent shapes are repeatedly arranged.

[0046] The mesh pattern of the detection electrode is preferably a regular mesh pattern having openings of the same shape, such as diamond or square. From the viewpoint of visibility, the length L of one side of the opening is preferably 5 to 1500 μm, more preferably 10 to 1000 μm. When the length L of one side of the opening is within the above range, it is possible to maintain good transparency, and when the touch sensor with the adhesive layer is attached to the display surface of an image display device, the displayed image can be viewed without any sense of incongruity. The aperture ratio of the mesh pattern of the detection electrode is preferably 90% or more, more preferably 95% or more, in terms of visible light transmittance. There is no particular upper limit, but it can be less than 100%. The aperture ratio corresponds to the area ratio of the openings, excluding the conductive thin wires, in the region where the detection electrode is provided, to the entire region where the detection electrode is provided. The mesh pattern of the detection electrode can be observed and measured using an optical microscope.

[0047] The width of the conductive thin wire constituting the detection electrode is preferably 10 μm or less, more preferably 5 μm or less, from the viewpoint of superior visibility. There is no particular lower limit, but the width is preferably 0.1 μm or more, more preferably 0.5 μm or more, from the viewpoint of superior conductive properties of the conductive thin wire. The height of the conductive thin wires is not particularly limited, but is, for example, 0.1 to 10 μm, and preferably 0.3 to 5 μm. The line width and height of the conductive thin wire are obtained by using a scanning electron microscope to select any five locations on the conductive thin wire and calculating the arithmetic mean of the values ​​corresponding to the measured line width and height.

[0048] The conductive thin wires preferably contain a metal. As the metal, silver (metallic silver), copper (metallic copper), gold (metallic gold), nickel (metallic nickel), palladium (metallic palladium), or a mixture of two or more of these is preferred because of its superior conductivity, with silver, copper, or a mixture thereof being more preferred, and silver being even more preferred. The conductive thin wire may contain only silver as the metal, and it is preferred that the metal be composed entirely of silver. By using silver as the metal, the occurrence of breakage failures in the conductive thin wire is reduced. The form of the metal in the conductive thin wire is not limited, and examples include a particulate form and a form in which the metal is dispersed in layers within the conductive thin wire.

[0049] The conductive thin wire may be a conductive thin wire containing metallic silver and a polymer binder such as gelatin and acrylic-styrene latex, which is suitable for forming a mesh pattern. When the conductive thin wire contains a polymer binder, the metal particles may be present in a dispersed state in the polymer, or the metal particles may be aggregated in the polymer and present as aggregates. The type of polymer is not particularly limited, and known polymers can be used. The conductive thin wires may be thin metal wires made of aluminum, copper, silver, molybdenum, titanium, or alloys thereof, or may have a laminated structure of these metals, such as molybdenum / copper / molybdenum or molybdenum / aluminum / molybdenum. The conductive thin wires may include metal oxide particles, metal pastes such as silver paste and copper paste, and metal nanowire particles such as silver nanowires and copper nanowires.

[0050] On the surface of the substrate, other members than the detection electrode may be disposed. Examples of other components include an electrode connection terminal formed at one end of the detection electrode, peripheral wiring electrically connected to the electrode connection terminal, and an external connection terminal electrically connected to the peripheral wiring and an external device. These components have the function of transmitting the electrical signal detected by the detection electrode to the external device. Furthermore, a dummy electrode may be disposed on the surface of the base material as another member.

[0051] (Touch sensor manufacturing method) The method for manufacturing the touch sensor is not particularly limited as long as it is a method that can form the above-mentioned detection electrode on the surface of the substrate manufactured by the above-mentioned method. Examples of methods that can be used to form the detection electrode include sputtering, plating, silver halide coating, and printing.

[0052] A method for forming a detection electrode by sputtering will be described. First, a copper foil layer is formed by sputtering, and then copper wiring is formed from the copper foil layer by photolithography, thereby forming the detection electrode. Instead of sputtering, the copper foil layer can also be formed by so-called vapor deposition. The copper foil layer can be formed using sputtered copper foil, vapor-deposited copper foil, or electrolytic copper foil. More specifically, the process for forming copper wiring described in JP 2014-029614 A can be used.

[0053] A method for forming a detection electrode by plating is described below. For example, a metal plating film is formed on an electroless plating base layer by electroless plating. This metal plating film can be used as the detection electrode. In this case, the detection electrode is formed by forming a pattern of a catalyst ink containing at least metal fine particles on a substrate, and then immersing the substrate in an electroless plating bath to form a metal plating film. More specifically, the method for manufacturing a metal-coated substrate described in JP 2014-159620 A can be used.

[0054] The detection electrode is formed by forming a pattern of a resin composition having functional groups capable of interacting with at least a metal catalyst precursor on a substrate, applying a catalyst or catalyst precursor, and immersing the substrate in an electroless plating bath to form a metal plating film. More specifically, the method for producing a metal-coated substrate described in JP 2012-144761 A can be applied.

[0055] A method for forming a detection electrode using a silver salt method will be described. First, a silver salt emulsion layer containing silver halide is exposed to light using an exposure pattern corresponding to the pattern of the detection electrode, and then developed to form the detection electrode. More specifically, the methods for manufacturing thin metal wires described in JP 2012-006377 A, JP 2014-112512 A, JP 2014-209332 A, JP 2015-022397 A, JP 2016-192200 A, and WO 2016 / 157585 A can be used.

[0056] A method for forming the detection electrode by printing will be described. First, a conductive paste containing conductive powder is applied to a substrate in the same pattern as the detection electrode, and then the substrate is subjected to a heat treatment to form the detection electrode. The pattern formation using the conductive paste is performed by, for example, an inkjet method or a screen printing method. More specifically, the conductive paste described in JP 2011-028985 A can be used as the conductive paste.

[0057] The touch sensor with an adhesive layer of the present invention may have a specific adhesive layer arranged on one surface of the touch sensor, and a layer other than the specific adhesive layer may be arranged on the surface opposite to the specific adhesive layer. The other layer may be, for example, a pressure-sensitive adhesive layer other than the specific pressure-sensitive adhesive layer, and a pressure-sensitive adhesive layer that does not contain a visible light absorbing material is preferred. That is, an embodiment having, in this order, the specific pressure-sensitive adhesive layer, a touch sensor, and a pressure-sensitive adhesive layer that does not contain a visible light absorbing material is one of preferred embodiments of the touch sensor with a pressure-sensitive adhesive layer. The material and thickness constituting the pressure-sensitive adhesive layer not containing a visible light absorbing material may be the same as those of the specific pressure-sensitive adhesive layer, including preferred embodiments, except that the pressure-sensitive adhesive layer does not contain a visible light absorbing material.

[0058] The method for producing the touch sensor with an adhesive layer of the present invention includes forming a specific adhesive layer on one surface of the touch sensor according to the above-mentioned method for forming a specific adhesive layer. The touch sensor with an adhesive layer of the present invention may also be produced by other methods.

[0059] The touch sensor with an adhesive layer of the present invention may be used in the form of a laminate in which another member, such as a release sheet, is attached to the specific adhesive layer during handling and transportation. The release sheet functions as a protective sheet to prevent scratches on the conductive member during transportation of the laminate. Furthermore, the touch sensor with an adhesive layer may be handled in the form of a composite having, for example, the touch sensor with an adhesive layer and a protective layer disposed in contact with the specific adhesive layer.

[0060] [Touch panel] The touch panel of the present invention has the pressure-sensitive adhesive layer-attached touch sensor of the present invention, and can be suitably used as a capacitance-type touch panel. The configuration of the touch panel of the present invention is not particularly limited except that it includes the touch sensor with the adhesive layer of the present invention, and reference can be made to the configuration described in "New Touch Panel Practical Lectures," a special edition of Monthly Display, edited by Yuji Mitani and Yoshio Itakura (Techno Times Co., Ltd., 2011). The touch panel of the present invention can also be configured as disclosed in "Latest Touch Panel Technology" (Techno Times Co., Ltd., July 6, 2009), "Touch Panel Technology and Development," edited by Yuji Mitani (CMC Publishing Co., Ltd., December 2004), FPD International 2009 Forum T-11 Lecture Textbook, and Cypress Semiconductor Corporation Application Note AN2292. The touch panel may be either an external type or a display-integrated type. An example of an external type is a film sensor. Examples of a display-integrated type include an on-cell type (e.g., FIG. 19 in JP 2013-168125 A) and other configurations (e.g., FIG. 6 in JP 2013-164871 A). The use of the touch panel of the present invention is not particularly limited, but it is preferable to combine it with an image display element to form an image display device.

[0061] [Image display device] The image display device of the present invention comprises an image display element and the pressure-sensitive adhesive layer-attached touch sensor of the present invention. The image display device can be used as a touch panel (capacitive touch panel) by the image display device and the touch sensor. An example of the configuration of the image display device of the present invention is an image display device 100 shown in Figure 1, which has an image display element 30, a touch sensor 20 with an adhesive layer, and a protective layer 40 in this order. In the image display device, it is preferable that the pressure-sensitive adhesive layer disposed on the surface of the touch sensor facing the image display element is a specific pressure-sensitive adhesive layer. In other words, it is preferable that the image display device has the image display element, the specific pressure-sensitive adhesive layer, and the touch sensor disposed in this order.

[0062] The image display element can be an element having a display surface for displaying images, etc., and examples thereof include a liquid crystal display element, an organic electroluminescent display element (OLED), a cathode ray tube (CRT) image display device, a vacuum fluorescent display (VFD), a plasma display panel (PDP), a surface-emitting diode (SED), a field emission display (FED), and electronic paper. As the image display element, an image display element having a form appropriate for the application is used as appropriate. In terms of enabling the image display device to be made thinner, an image display element having a panel form such as a liquid crystal display panel or an organic electroluminescence display panel is preferred.

[0063] As shown in FIG. 1, the image display device may further have a protective layer on the viewing side of the touch sensor (the side opposite to the image display element). In this case, the surface on the viewing side of the protective layer is the touch surface and the operation surface of the image display device. That is, the surface on the viewing side of the protective layer serves as the operation surface for input operations. The touch surface means a surface that detects contact with a finger, a stylus pen, or the like. The surface on the viewing side of the protective layer is the viewing surface for an image displayed on the display surface of the image display element. Since the surface of the protective layer is the touch surface, a hard coat layer may be provided on the surface as needed. In addition, it is preferable to subject the surface of the protective layer to treatments that impart various functions, such as anti-scratch treatment, anti-glare treatment, anti-fouling treatment, anti-fogging treatment, and anti-reflection treatment.

[0064] The configuration of the protective layer is not particularly limited, but is preferably transparent so that the image displayed on the display surface of the image display element can be seen. Examples of the protective layer include a plastic film, a plastic plate, and a glass plate. The thickness of the protective layer is preferably selected appropriately depending on the intended use. A protective layer made of glass is called a cover glass. Examples of raw materials for the above-mentioned plastic films and plastic plates include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefins such as polyethylene (PE), polypropylene (PP), polystyrene and EVA (polyethylene vinyl acetate copolymer), vinyl resins, polycarbonate (PC), polyamide, polyimide, acrylic resin, triacetyl cellulose (TAC), cycloolefin resin (COP), polyvinylidene fluoride (PVDF), polyarylate (PAR), polyethersulfone (PES), polymeric acrylic resin, fluorene derivatives, and polymers such as crystalline COP. Furthermore, a polarizing plate, a circular polarizing plate, or the like may be used as the protective layer.

[0065] In terms of weight reduction and contrast improvement, the protective layer is preferably thin. Specifically, the thickness of the protective layer is preferably 1 mm or less, more preferably 0.5 mm or less, and even more preferably 0.3 mm or less. The lower limit is not particularly limited, and may be, for example, 0.1 mm or more. The refractive index of the protective layer is preferably 1.40 to 1.70, and the difference in refractive index between the protective layer and other members is preferably 0.1 or less.

[0066] The present invention is basically configured as described above. The present invention is not limited to the above-described embodiment, and various improvements and modifications may be made without departing from the spirit and scope of the present invention. [Example]

[0067] The present invention will be described in more detail below with reference to examples. The materials, amounts used, ratios, treatment details, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the following examples.

[0068] [Example 1] [Preparation of Pressure-Sensitive Adhesive Composition 1] Butyl acrylate (BA) and 2-hydroxyethyl acrylate (2HEA) were mixed in a mass ratio of 75:25 in ethyl acetate, and AIBN (azobisisobutyronitrile) was dissolved therein as a radical polymerization initiator to obtain a solution. The resulting solution was heated to 60°C to cause random copolymerization, resulting in an acrylic polymer. The obtained acrylic polymer was mixed with an isocyanate-based crosslinking agent (Coronate (registered trademark) L manufactured by Tosoh Corporation, a 75% ethyl acetate solution of trimethylolpropane / tolylene diisocyanate trimer adduct), a visible light absorber (UF-8 manufactured by Mitsubishi Materials Electronic Chemicals Co., Ltd., titanium oxynitride, average primary particle size = 20 nm), an ultraviolet absorber 1 (Tinuvin (registered trademark) 477 manufactured by BASF Japan Ltd., a hydroxyphenyltriazine-based compound), an ultraviolet absorber 2 (Tinuvin 384-2 manufactured by BASF Japan Ltd., a benzotriazole-based compound), and a solvent (ethyl acetate) to obtain a pressure-sensitive adhesive composition 1 having a solids concentration of 31% by mass. With respect to the total mass of the solid content of the adhesive composition 1, the content of the crosslinker was 0.6 mass%, the content of the visible light absorber was 26 mass ppm, the total content of the ultraviolet absorber was 1.00 mass%, and the remainder was acrylic polymer.

[0069] [Preparation of Touch Sensor with Adhesive Layer] The adhesive composition 1 was applied to the release-treated surface of a release sheet (a heavy separator film manufactured by Mitsubishi Chemical Corporation, a release-treated polyethylene terephthalate film) to a thickness of D after drying. a The coating was then dried at 100°C for 5 minutes to remove the solvent, thereby forming a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer. A touch sensor produced according to the method described in Example 1 of JP-A No. 2022-161790 was attached to the surface of this adhesive sheet on which the adhesive layer was formed, thereby obtaining a touch sensor 1 with an adhesive layer of Example 1.

[0070] [Example 2] PSA composition 2 was prepared in the same manner as PSA composition 1 in Example 1, except that the amount of the visible light absorber added was adjusted so that the content of the visible light absorber relative to the total mass of the solid content was 16.5 mass ppm. a A touch sensor 2 with an adhesive layer of Example 2 was obtained in the same manner as in Example 1, except that the adhesive composition 2 was applied so that the thickness became 50 μm.

[0071] [Example 3] Except for adjusting the amount of the visible light absorbent added so that the content of the visible light absorbent relative to the total mass of the solid content was 15 ppm by mass, adhesive composition 3 was prepared in the same manner as the preparation method for adhesive composition 1 of Example 1. Except for using adhesive composition 3 instead of adhesive composition 1, a touch sensor 3 with an adhesive layer of Example 3 was obtained in the same manner as Example 1.

[0072] [Example 4] Except for adjusting the amount of the visible light absorbent added so that the content of the visible light absorbent relative to the total mass of the solid content was 150 ppm by mass, adhesive composition 4 was prepared in the same manner as the preparation method for adhesive composition 1 of Example 1. Except for using adhesive composition 4 instead of adhesive composition 1, an adhesive layer-equipped touch sensor 4 of Example 4 was obtained in the same manner as Example 1.

[0073] [Example 5] PSA composition 5 was prepared in the same manner as PSA composition 1 in Example 1, except that the amount of the visible light absorber added was adjusted so that the content of the visible light absorber relative to the total mass of the solid content was 34 ppm by mass. a A touch sensor 5 with an adhesive layer of Example 5 was obtained in the same manner as in Example 1, except that the adhesive composition 5 was applied so that the thickness became 250 μm.

[0074] [Example 6] Except for adjusting the amount of the visible light absorbent added so that the content of the visible light absorbent relative to the total mass of the solid content was 96 ppm by mass, adhesive composition 6 was prepared in the same manner as the preparation method of adhesive composition 5 of Example 5. Except for using adhesive composition 6 instead of adhesive composition 5, an adhesive layer-equipped touch sensor 6 of Example 6 was obtained in the same manner as Example 5.

[0075] [Example 7] PSA composition 7 was prepared in the same manner as PSA composition 1 in Example 1, except that the amount of the visible light absorber added was adjusted so that the content of the visible light absorber relative to the total mass of the solid content was 36 mass ppm. a A touch sensor 7 with an adhesive layer of Example 7 was obtained in the same manner as in Example 1, except that the adhesive composition 7 was applied so that the thickness became 400 μm.

[0076] [Comparative Example 1] Except for not adding a visible light absorbing material, a pressure-sensitive adhesive composition C1 was prepared in the same manner as the preparation method of the pressure-sensitive adhesive composition 1 in Example 1. Except for using the pressure-sensitive adhesive composition C1 instead of the pressure-sensitive adhesive composition 1, a touch sensor C1 with a pressure-sensitive adhesive layer of Comparative Example 1 was obtained in the same manner as in Example 1.

[0077] Comparative Example 2 Except for adjusting the amount of the visible light absorbent added so that the content of the visible light absorbent relative to the total mass of the solid content was 4 ppm by mass, a pressure-sensitive adhesive composition C2 was prepared in the same manner as the preparation method for the pressure-sensitive adhesive composition 1 in Example 1. Except for using the pressure-sensitive adhesive composition C2 instead of the pressure-sensitive adhesive composition 1, a touch sensor C2 with a pressure-sensitive adhesive layer of Comparative Example 2 was obtained in the same manner as in Example 1.

[0078] Comparative Example 3 Except for adjusting the amount of the visible light absorbent added so that the content of the visible light absorbent relative to the total mass of the solid content was 250 ppm by mass, a pressure-sensitive adhesive composition C3 was prepared in the same manner as the preparation method for the pressure-sensitive adhesive composition 1 in Example 1. Except for using the pressure-sensitive adhesive composition C3 instead of the pressure-sensitive adhesive composition 1, a touch sensor C3 with a pressure-sensitive adhesive layer of Comparative Example 3 was obtained in the same manner as in Example 1.

[0079] Comparative Example 4 A pressure-sensitive adhesive composition C4 was prepared in the same manner as the preparation method for pressure-sensitive adhesive composition 5 in Example 5, except that the amount of the visible light absorber added was adjusted so that the content of the visible light absorber relative to the total mass of the solid content was 150 ppm by mass. A touch sensor C4 with a pressure-sensitive adhesive layer of Comparative Example 4 was obtained in the same manner as in Example 5, except that pressure-sensitive adhesive composition C4 was used instead of pressure-sensitive adhesive composition 5.

[0080] Comparative Example 5 A pressure-sensitive adhesive composition C5 was prepared in the same manner as the preparation method for pressure-sensitive adhesive composition 7 of Example 7, except that the amount of the visible light absorbent added was adjusted so that the content of the visible light absorbent relative to the total mass of the solid content was 12 ppm by mass. A touch sensor C5 with a pressure-sensitive adhesive layer of Comparative Example 5 was obtained in the same manner as Example 7, except that pressure-sensitive adhesive composition C5 was used instead of pressure-sensitive adhesive composition 7.

[0081] [Measurement of thickness of substrate and adhesive layer] The thickness of the substrate and the adhesive layer was measured using a linear gauge (Mitutoyo Corporation, separate type gauge head high precision linear gauge "LGH-1010C-B-EH" and linear gauge counter "EH-10S") according to the following procedure. Support substrate 1 and support substrate 2 were prepared, each made of triacetyl cellulose (TAC) film (manufactured by Fujifilm Corporation, thickness 40 μm). Nine measurement positions were arbitrarily selected on one of the support substrates, and the thickness was measured. Next, the thickness of the other support substrate was measured at nine measurement positions that coincided in the thickness direction with the measurement positions selected on the other support substrate. The pressure-sensitive adhesive layer of each pressure-sensitive adhesive sheet was bonded between supporting substrate 1 and supporting substrate 2 to prepare a composite member for thickness measurement. The thickness of the obtained composite member was measured at the nine measurement positions described above, and the thickness of supporting substrate 1 and supporting substrate 2 at each measurement position was subtracted from the thickness of each of the nine positions of the composite member. The arithmetic mean value of the obtained differences at the nine points was determined as the thickness of the substrate D a It was decided.

[0082] [Measurement of optical performance of adhesive layer] The optical performance of the adhesive layer formed in each example was measured using a spectrophotometer with an integrating sphere unit (manufactured by JASCO Corporation, ultraviolet-visible spectrophotometer "V-660", integrating sphere unit "ISV-722") according to the following procedure.

[0083] A laminate was prepared by laminating a support substrate made of triacetyl cellulose (TAC) film (manufactured by Fujifilm Corporation, thickness 40 μm) and a Spectralon standard reflector (manufactured by JASCO Corporation, case-attached standard white plate 6916-H422A) to prepare a support white plate. The prepared support white plate was placed in the reflectance measurement sample holder of the integrating sphere unit so that the measurement light was incident on the support substrate, and the visible light reflectance ρ0 of the support white plate was obtained according to the method described in JIS R 3106:2019.

[0084] <2> Measurement of sample substrate The adhesive layer of the adhesive sheet prepared in each Example and Comparative Example was transferred to the support substrate used in measuring the visible light reflectance ρ0 to prepare a composite member. Furthermore, the obtained composite member and the Spectralon standard reflector were laminated in the order of the Spectralon standard reflector, support substrate, and adhesive layer to prepare a laminate. The prepared laminate was placed in the reflectance measurement sample holder of the integrating sphere unit so that the measurement light was incident on the surface on the adhesive layer side, and measurements and calculations were carried out in the same manner as above to obtain the visible light reflectance ρ0 of the laminate. x obtained.

[0085] The visible light reflectance ρ0 of the obtained support white board and the visible light reflectance ρ of the laminate x From the above, the internal absorbance A of the adhesive layer is calculated by the following formula (1).a The calculated internal absorbance A a and the thickness of the adhesive layer D a (m), the parameter X(m -1 ) was calculated. Formula (1) A a = -log 10 {(ρ x / ρ0) 0.5} Equation (2) X = A a / D a Table 1 below shows the internal absorbance A of each adhesive layer. a and parameter X.

[0086] The relative dielectric constants of the pressure-sensitive adhesive layers provided in Examples 1 to 7 were measured at a frequency of 100 kHz, and the relative dielectric constants were found to be within a range of 2.5 to 3.0.

[0087] [evaluation] (Fabrication of evaluation touch panel) In order to eliminate the influence of individual differences between display elements and to strictly compare samples, a simulated touch panel was fabricated by the following method.

[0088] - Fabrication of composite materials - The following components, each including a touch sensor with an adhesive layer obtained in each of the Examples and Comparative Examples, were bonded together to prepare a composite member in which the components were arranged in the following order. Glass substrate (thickness 0.4 mm) Transparent adhesive layer (3M Japan 8146-3, thickness 75 μm) Touch sensor with adhesive layer TAC film (manufactured by Fujifilm Corporation, thickness 40 μm) The touch sensor with the adhesive layer is arranged so that the adhesive layer is in contact with the TAC film.

[0089] -Creating a mock panel- A simulated panel was prepared by dropping 0.7 mL of matching oil (Newton's ring prevention agent "HM-30" manufactured by Koyo Chemical Industry Co., Ltd.) onto the display surface of a 14-inch organic EL panel (manufactured by Samsung Display Co., Ltd., model number "ATNA40CU03"), and then placing the composite member on top of the oil so that the TAC film faced the organic EL panel and so as to prevent air from entering. Furthermore, after confirming that the evaluation values ​​for the simulated panel roughly match those for actual touch panel products (for example, a touch panel having a component configuration with glass, a transparent adhesive layer, a touch sensor, a transparent adhesive layer, and an organic EL panel in that order), and that there was no difference in the evaluation order, the above evaluation method was adopted as an evaluation method for the implemented form.

[0090] -Measurement of black display brightness- A simulated panel was placed in a windowless darkroom with the display surface facing vertically upward. An 80mm x 80mm square image of black ((R, G, B) = (0, 0, 0)) was displayed in the center of the screen of the simulated panel, and a white image ((R, G, B) = (255, 255, 255)) was displayed all around the black image. A cylinder (60mm diameter, 350mm length) made by rolling up black cardboard was placed vertically in the center of the screen of the simulated panel so that the center of the black image on the simulated panel and the central axis of the cylinder were approximately aligned. A spectroradiometer (CS-3000HDR, manufactured by Konica Minolta, Inc.) was attached to the end of the cylinder, and the luminance of the image displayed by the simulated panel was measured under the following measurement conditions. This was taken as the black display luminance. (Luminance meter measurement conditions) Speed ​​mode: FAST Dark Setting: Standard Aperture angle: 1deg

[0091] -Measurement of white display brightness- The brightness was measured in the same manner as for measuring the black display brightness, except that the image displayed on the simulated panel was an entirely white image ((R, G, B) = (255, 255, 255)), and this was taken as the white display brightness. In addition, when the brightness was measured in the same manner as above, except that an image in which the black and white of the image displayed in the measurement of the black display brightness was inverted, the brightness value obtained was the same as the white display brightness measured when a white image was displayed on the entire screen.

[0092] The measurement results of the black display luminance and white display luminance of the touch sensors with the adhesive layer produced in each of the Examples and Comparative Examples are shown in Table 1 below. When measuring the OLED panel alone without laminating the composite material, the black display luminance is 0.2 mCd / m 2 , White display brightness = 441 Cd / m 2 The contrast ratio (ratio of white display brightness to black display brightness) was 2.21 million.

[0093] (Contrast evaluation) From the measurement results of the black display luminance and the white display luminance obtained above, the contrast between the black display and the white display when black and white display was performed was evaluated. Specifically, the ratio of the measured value of the white display luminance to the measured value of the black display luminance was calculated as the contrast ratio, and the contrast of each touch sensor was evaluated from the obtained contrast ratio based on the following criteria.

[0094] -Contrast evaluation criteria- "A": Contrast ratio of 900,000 or more. "B": Contrast ratio is between 600,000 and 900,000. "C": Contrast ratio is between 300,000 and 600,000. "D": Contrast ratio is less than 300,000.

[0095] (Evaluation of white display brightness) From the measurement results of the white display luminance obtained above, the performance of the touch sensor in suppressing a decrease in the white display luminance was evaluated. Specifically, the loss rate of white display luminance due to the touch sensor was calculated using the formula below from the measurement results of the white display luminance of each simulated panel and the measurement results of the white display luminance when the organic EL panel was used alone, and the performance of each touch sensor in suppressing the decrease in white display luminance was evaluated from the obtained loss rate based on the following criteria. White display brightness loss rate (%) = (1 - simulated panel white display brightness / OLED panel white display brightness) x 100

[0096] -Evaluation criteria for suppressing the decrease in white display brightness- "A": White display brightness loss rate is 2% or less. "B": White display brightness loss rate is more than 2% and less than 4%. "C": White display brightness loss rate is over 4% and 6% or less. "D": White display brightness loss rate exceeds 6%.

[0097] Table 1 shows the properties of the pressure-sensitive adhesive layer, the brightness measurement results, and the evaluation results for each example. The criteria for determining whether a touch sensor can achieve a high-brightness, high-contrast touch panel are as follows: if all ratings are A to C, it is at an acceptable level; if all ratings are A or B, it is at a good level; and if all ratings are A, it is at an excellent level.

[0098] [Table 1]

[0099] [Table 2]

[0100] From the results in Table 1, it was confirmed that the touch sensors with adhesive layers of the present invention in Examples 1 to 7 have excellent contrast between black and white displays when applied to a display device to display black and white, and also have excellent performance in suppressing a decrease in brightness of the white display. On the other hand, if the parameter X is 20m -1 The touch sensors with adhesive layers of Comparative Examples 1, 2 and 5, which had a white display brightness of less than 100%, maintained a high level, but the improvement in contrast was insufficient. In addition, the internal absorbance A a The touch sensors with the adhesive layer of Comparative Examples 3 and 4, in which the difference was greater than 0.03, had a large loss in white display brightness and were insufficient in terms of performance in suppressing brightness reduction.

[0101] From the comparison between Examples 2 and 3 and the comparison between Examples 4 and 6, the internal absorbance A a Even if the thickness of the specific adhesive layer D a It was confirmed that the thinner the film, the better the contrast between black and white display when black and white display was performed. From these comparisons, it was confirmed that when the thickness of the specific adhesive layer is 300 μm or less, the contrast between the black display and the white display when black and white display is performed can be improved while suppressing a decrease in the brightness of the white display, and further, when the thickness of the specific adhesive layer is 100 μm or less, the above contrast can be further improved while suppressing a decrease in the brightness of the white display. [Explanation of symbols]

[0102] 1 Base material 4,5 Adhesive layer 10 Touch Sensor 10a,10b,40a surface 11,12 Detection electrode 20 Touch sensor with adhesive layer 30 Image display element 30a Display surface 40 protective layer 100 Image display device

Claims

1. A touch sensor; an adhesive layer disposed on one surface side of the touch sensor, the pressure-sensitive adhesive layer contains a visible light absorbing material, The pressure-sensitive adhesive layer has an internal absorbance A calculated by the following test X. ａ is 0.03 or less, and the parameter X is 20m －１ This completes the touch sensor with an adhesive layer. Test X: Visible light reflectance ρ of the supporting white plate measured by the method described in JIS R 3106:2019 ０ According to the method described in JIS R 3106:2019, a measurement light is incident on the adhesive side of the laminate formed by laminating the support white board and the adhesive, and the visible light reflectance ρ ｘ get. The visible light reflectance ρ ０ and the visible light reflectance ρ ｘ The internal absorbance A of the pressure-sensitive adhesive layer is calculated from the following formula (1): ａ The calculated internal absorbance A ａ and the thickness D of the pressure-sensitive adhesive layer ａ (m) to obtain the parameter X(m －１ ) is calculated. formula (1) A ａ = -log １０ {(r) ｘ / r ０ ) ０．５ } Formula (2) X = A ａ / D ａ

2. The touch sensor with an adhesive layer according to claim 1 , wherein the adhesive layer has a thickness of 300 μm or less.

3. the visible light absorbing material is a black pigment, 2. The touch sensor with an adhesive layer according to claim 1, wherein the content of the black pigment is 5 to 200 ppm by mass with respect to the total mass of the adhesive layer.

4. The thickness of the pressure-sensitive adhesive layer is 300 μm or less, the visible light absorbing material is a black pigment, 2. The touch sensor with an adhesive layer according to claim 1, wherein the content of the black pigment is 5 to 200 ppm by mass with respect to the total mass of the adhesive layer.

5. A touch panel comprising the touch sensor with the adhesive layer according to any one of claims 1 to 4.

6. an image display element; An image display device comprising the touch sensor with the adhesive layer according to any one of claims 1 to 4.

7. 7. The image display device according to claim 6, wherein the image display element is an organic electroluminescence display element.

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