Adhesive sheets and display units

Abstract

An adhesive sheet 1 to be adhered to a member having a plurality of light emitting bodies comprises an adhesive layer 11 including at least one colored adhesive layer 111, wherein, when the brightness of transmitted light is measured by disposing, on a white light source of 300 cd / m2, a laminate obtained by adhering the adhesive layer 11 to a transparent adherend, in which a plurality of protrusions having a height of 75 µm and a width of 3 mm extend at 3 mm intervals, the adjacent protrusions forming recesses therebetween, a brightness difference obtained by subtracting the brightness (cd / m2) in the sections corresponding to the recesses from the brightness (cd / m2) in the sections corresponding to the protrusions is 5 cd / m2 or more. This adhesive sheet 1 is suitable for adhesion onto a member having a plurality of light emitting bodies.

Description

[Technical Field]

[0001] The present invention relates to a component having multiple light-emitting elements, such as an adhesive sheet attached to a display component, and a display using the adhesive sheet. [Background technology]

[0002] In recent years, liquid crystal displays (LCDs) are widely used as display devices in electronic devices such as mobile phones, smartphones, tablet devices, and game consoles. Since the display unit, which consists of an LCD panel or similar material, does not emit light itself, display devices using such a display unit are equipped with a backlight to illuminate the display unit.

[0003] Until now, the most common method for arranging the backlight source in the above-mentioned display devices has been the side-light type, where the light source is placed on the side of the light guide plate. However, recently, from the standpoint of screen brightness and contrast, direct-lit backlights, where the light source is placed directly beneath the display area, are beginning to be considered. In direct-lit backlights, in order to increase the light output and, when used as a display device, to make the light output uniform from, for example, the center and edges of the screen, there is a trend towards providing a large number of light-emitting elements, typically light-emitting diodes (LEDs), on the substrate.

[0004] In the case of using multiple light-emitting elements as the light source for a direct-lit backlight, it is desirable to seal the light-emitting elements with resin or the like, as these elements have low water resistance. For example, Patent Document 1 proposes providing an adhesive layer containing light-scattering particles on the light-emitting elements of the aforementioned backlight. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 5590582 [Overview of the project] [Problems that the invention aims to solve]

[0006] Incidentally, when there are a plurality of light emitters such as LEDs as described above, in order to suppress color mixing of the colors (R, G, B) of adjacent light emitters and color bleeding due thereto, it is conceivable to have a coloring substance (particularly a black coloring substance) between the light emitters. On the other hand, when the coloring substance is thickly present on the light emitter, there arises a problem that the visibility of the display device deteriorates.

[0007] The present invention has been made in view of such a situation, and an object thereof is to provide an adhesive sheet suitable for sticking to a member having a plurality of light emitters, and a display device using the adhesive sheet.

Means for Solving the Problems

[0008] In order to achieve the above object, first, the present invention provides an adhesive sheet to be attached to a member having a plurality of light emitters, the adhesive sheet including an adhesive layer containing at least one colored adhesive layer, and a transparent adherend having convex portions with a height of 75 μm and a width of 3 mm extending in plurality at intervals of 3 mm, and recesses between adjacent convex portions, is attached to the adhesive layer, and when the laminate is placed on a white light source of 300 cd / m 2 and the luminance of the transmitted light is measured, the luminance difference obtained by subtracting the luminance (cd / m 2 ) of the portion corresponding to the recess from the luminance (cd / m 2 ) of the portion corresponding to the convex portion is 5 cd / m 2 or more. (Invention 1)

[0009] When the adhesive sheet according to the above invention (Invention 1) is attached to a member having a plurality of light emitters (as an example, mini LEDs or micro LEDs), while suppressing a decrease in the luminance of the light emitters, an adhesive layer, particularly a colored adhesive layer, can be present between the light emitters. Thereby, for example, color mixing of adjacent light emitters and color bleeding due thereto can be suppressed, and the luminance of the light emitters can be sufficiently maintained. Particularly when the colored adhesive layer is black, the adhesive layer functions as a black matrix.

[0010] In the above invention (Invention 1), it is preferable that the total light transmittance of the adhesive layer is 1% or more and 95% or less (Invention 2).

[0011] In the above inventions (Inventions 1 and 2), it is preferable that the haze value of the adhesive layer is 0.1% or more and 80% or less (Invention 3).

[0012] In the above inventions (Inventions 1 to 3), it is preferable that the gel fraction of the adhesive constituting the adhesive layer is 10% or more and 80% or less (Invention 4).

[0013] In the above inventions (Inventions 1 to 4), it is preferable that the adhesive layer is curable by active energy rays, and that the gel fraction of the adhesive constituting the adhesive layer after curing by active energy rays is 40% or more and 95% or less (Invention 5).

[0014] In the above inventions (Inventions 1 to 5), it is preferable that the adhesive layer is a laminate of at least one colored adhesive layer and at least one colorless adhesive layer (Invention 6).

[0015] In the above inventions (Inventions 1 to 6), it is preferable that the adhesive layer is an adhesive layer for bonding one display component to another display component, and that at least one of the one display component and the other display component has the light-emitting element (Invention 7).

[0016] In the above invention (Invention 7), it is preferable that at least one of the one display element component and the other display element component has irregularities on the surface to which it is bonded by the adhesive layer (Invention 8).

[0017] In the above invention (Invention 8), it is preferable that the irregularities are caused by a plurality of light-emitting elements (Invention 9).

[0018] In the above inventions (inventions 1 to 9), it is preferable to have two release sheets and an adhesive layer sandwiched between the release sheets so as to be in contact with the release surfaces of the two release sheets (invention 10).

[0019] Secondly, the present invention provides a display body comprising one display body component, another display body component, and an adhesive layer for bonding the one display body component and the other display body component together, wherein at least one of the one display body component and the other display body component has a plurality of light-emitting elements, and the adhesive layer is formed from the adhesive layer of the adhesive sheet (Inventions 1 to 10) (Invention 11).

[0020] In the above invention (Invention 11), it is preferable that at least one of the one display element component and the other display element component has irregularities on the surface to which it is bonded by the adhesive layer (Invention 12).

[0021] In the above invention (Invention 12), it is preferable that the irregularities are caused by a plurality of light-emitting elements (Invention 13). [Effects of the Invention]

[0022] The adhesive sheet according to the present invention is suitable for attachment to a component having multiple light-emitting elements. Furthermore, the display device according to the present invention has multiple light-emitting elements in a suitable state. [Brief explanation of the drawing]

[0023] [Figure 1] This is a cross-sectional view of an adhesive sheet according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view of an adhesive sheet according to another embodiment of the present invention. [Figure 3] This is a cross-sectional view of a display body according to one embodiment of the present invention. [Figure 4] This is a cross-sectional view of a display body according to another embodiment of the present invention. [Figure 5] This is a cross-sectional view of a display body according to another embodiment of the present invention. [Modes for carrying out the invention]

[0024] Embodiments of the present invention will be described below. [Adhesive sheet] An adhesive sheet according to one embodiment of the present invention is an adhesive sheet that is attached to a member having a plurality of light-emitting elements. The "member having a plurality of light-emitting elements" will be described later. The adhesive sheet according to this embodiment comprises an adhesive layer including at least one colored adhesive layer. Note that "an adhesive layer including at least one colored adhesive layer" also includes an adhesive layer consisting of only one colored adhesive layer.

[0025] In the adhesive sheet according to this embodiment, a laminate is obtained by attaching the adhesive layer to a transparent substrate in which multiple protrusions, each 75 μm high and 3 mm wide, extend at 3 mm intervals, with recesses between adjacent protrusions. The laminate has a density of 300 cd / m². 2 When placed on a white light source and the luminance of the transmitted light is measured, the luminance (cd / m²) in the portion corresponding to the convex portion is measured. 2 ) From the above recess, the brightness (cd / m²) in the part corresponding to the recess 2 The brightness difference after subtracting ) is 5 cd / m² 2 The above is preferable. The method for measuring luminance in this specification is as shown in the test examples described later.

[0026] When the adhesive sheet satisfying the above physical properties is attached to a member having a plurality of light emitters (for example, mini LEDs or micro LEDs), it is possible to suppress a decrease in the luminance of the light emitters and to have an adhesive layer, particularly a colored adhesive layer, between the light emitters. Thereby, for example, when the plurality of light emitters are red (R), green (G), and blue (B), respectively, it is possible to suppress color mixing of the colors (R, G, B) of adjacent light emitters and color bleeding due to the same, and to sufficiently maintain the luminance of the light emitters. Particularly when the colored adhesive layer is black, the adhesive layer in the present embodiment functions as a black matrix. Note that, as described above, a large luminance difference between the portion corresponding to the convex portion and the portion corresponding to the concave portion means that the luminance of the portion corresponding to the convex portion (light emitter) is large and the luminance of the portion corresponding to the concave portion (between adjacent light emitters) is small. This is achieved by the colored adhesive layer filling the concave portions between the plurality of light emitters and the colored adhesive layer not existing or thinly existing on the upper surface (light emitting surface) of each light emitter (convex portion) (the property of reaching this state may be hereinafter referred to as "concavo-convex embedding property"). Thereby, the above-described functions and effects are exhibited. As described above, the adhesive sheet according to the present embodiment is suitable for attachment to a member having a plurality of light emitters.

[0027] From the viewpoint of the above functions and effects, the above luminance difference is preferably 5 cd / m 2 or more, more preferably 7 cd / m 2 or more, particularly preferably 10 cd / m 2 or more, and even more preferably 15 cd / m 2 or more.

[0028] On the other hand, from the viewpoint of suppressing luminance unevenness, the above luminance difference is preferably 250 cd / m 2 or less, more preferably 200 cd / m 2 or less, particularly preferably 150 cd / m 2 or less, and even more preferably 100 cd / m 2 or less.

[0029] The brightness in the portion corresponding to the above-mentioned protrusion is 30 cd / m². 2 Preferably, it is 50 cd / m² or higher. 2 It is more preferable that it be greater than or equal to 60 cd / m². 2 Preferably, it is 70 cd / m² or higher, and more preferably 70 cd / m² 2 It is preferable that the above conditions are met. This makes it easier to satisfy the above-mentioned brightness difference and allows the brightness of the light-emitting element to be more sufficient. The upper limit of the brightness in the portion corresponding to the above-mentioned protrusion is not particularly limited, but 2000 cd / m² is preferable. 2 Preferably, it is 1500 cd / m². 2 It is more preferable that the following conditions are met, and especially 1000 cd / m². 2 Preferably the following, and moreover 500 cd / m² 2 Preferably, it is 200 cd / m². 2 The following is most preferable:

[0030] The brightness in the area corresponding to the above-mentioned recess is 1800 cd / m². 2 Preferably, it is 1300 cd / m². 2 It is more preferable that the following conditions are met, particularly 800 cd / m² 2 Preferably the following, and moreover 300 cd / m² 2 Preferably, it is 150 cd / m². 2 The following is most preferable. This makes it easier to satisfy the above-mentioned brightness difference and effectively suppresses the mixing of the light-emitting material's colors (R, G, B) and the resulting color bleeding. The lower limit of brightness in the portion corresponding to the above-mentioned recess is not particularly limited, but is 0.1 cd / m². 2 Preferably, it is 1 cd / m² or higher. 2 It is more preferable that it be greater than or equal to 10 cd / m², and especially 10 cd / m². 2 Preferably, it is 30 cd / m² or higher, and more preferably 30 cd / m² 2 Preferably, it is 50 cd / m² or higher. 2 The above is the most preferable.

[0031] In this embodiment, the total light transmittance of the adhesive layer is preferably 1% or more and 95% or less. This makes it easier to satisfy the above physical properties. From this viewpoint, the total light transmittance is more preferably 5 to 90%, particularly preferably 10 to 80%, even more preferably 16 to 75%, and most preferably 22 to 57%. Here, a lower total light transmittance of the adhesive layer tends to result in a larger brightness difference as described above. The total light transmittance in this specification is a value measured in accordance with JIS K7361-1:1997.

[0032] In this embodiment, the haze value of the adhesive layer is preferably 0.1% or more and 80% or less. This makes it easier to satisfy the above physical properties. From this viewpoint, the haze value is more preferably 0.3 to 60%, particularly preferably 0.5 to 30%, even more preferably 1 to 15%, and most preferably 1.2 to 8%. The haze values ​​in this specification are those measured in accordance with JIS K7136:2000.

[0033] In this embodiment, the chromaticity a* of the adhesive layer, as defined by the CIE1976L*a*b* color system, is preferably -20 to 20, more preferably -15 to 15, particularly preferably -10 to 10, even more preferably -5 to 5, most preferably -1 to 1, and most preferably -0.3 to 0.3. Having the chromaticity a* within this range enhances the black matrix effect of the adhesive layer, more effectively suppressing the mixing of colors (R, G, B) of adjacent light-emitting elements and the resulting color bleeding. The method for measuring chromaticity a* in this specification is as shown in the test examples described later.

[0034] In this embodiment, the chromaticity b* of the adhesive layer, as defined by the CIE1976L*a*b* color system, is preferably -20 to 20, more preferably -15 to 15, particularly preferably -10 to 10, and even more preferably -5 to 5. Having the chromaticity b* within this range enhances the black matrix effect of the adhesive layer, more effectively suppressing the mixing of colors (R, G, B) of adjacent light-emitting elements and the resulting color bleeding. The method for measuring chromaticity b* in this specification is as shown in the test examples described later.

[0035] The above physical properties can be achieved by appropriately selecting and setting the type and amount of colorant contained in the adhesive constituting the colored adhesive layer, the thickness of the colored adhesive layer, and the storage modulus and gel fraction of the adhesive layer.

[0036] Figure 1 shows a specific configuration as an example of an adhesive sheet according to one embodiment of the present invention. As shown in Figure 1, the adhesive sheet 1A is composed of two release sheets 12a and 12b and an adhesive layer 11 consisting of a colored adhesive layer 111 sandwiched between the two release sheets 12a and 12b so as to be in contact with the release surfaces of the two release sheets 12a and 12b. In this specification, the release surface of a release sheet refers to the surface of the release sheet that has release properties, and includes both surfaces that have undergone a release treatment and surfaces that exhibit release properties even without a release treatment.

[0037] Furthermore, Figure 2 shows a specific configuration as an example of an adhesive sheet according to another embodiment of the present invention. As shown in Figure 2, the adhesive sheet 1B is composed of two release sheets 12a and 12b and an adhesive layer 11 sandwiched between the two release sheets 12a and 12b so as to be in contact with the release surfaces of the two release sheets 12a and 12b. In this embodiment, the adhesive layer 11 is a laminate of one colored adhesive layer 111 and one colorless adhesive layer 112. However, the present invention is not limited thereto, and there may be multiple layers of both the colored adhesive layer 111 and the colorless adhesive layer 112.

[0038] In the adhesive sheet 1B according to this embodiment, the layer that is attached to the member having multiple light-emitting elements may be a colored adhesive layer 111 or a colorless adhesive layer 112. From the viewpoint of ease of satisfying the aforementioned physical properties, it is more preferable that the layer that first comes into contact with the member having multiple light-emitting elements during attachment is the colored adhesive layer 111.

[0039] 1. Each element 1-1. Adhesive layer The colored adhesive layer 111 is preferably composed of an adhesive containing a coloring agent. On the other hand, the colorless adhesive layer 112 is preferably composed of an adhesive that does not contain a coloring agent, and is also preferably colorless and transparent. Note that "does not contain a coloring agent" means "substantially does not contain a coloring agent," and includes not only cases where no coloring agent is contained at all, but also cases where a coloring agent is contained in an amount that does not impair the effects in this embodiment. The amount is preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, even more preferably 0.001% by mass or less, and most preferably 0% by mass.

[0040] The type of adhesive constituting the colored adhesive layer 111 and the colorless adhesive layer 112 of the adhesive sheets 1A and 1B according to this embodiment is not particularly limited and may be any of the following: acrylic adhesive, polyester adhesive, polyurethane adhesive, rubber adhesive, silicone adhesive, etc. Furthermore, the adhesive may be emulsion type, solvent type, or solvent-free type, and may be crosslinked type or non-crosslinked type. Among these, acrylic adhesives are preferred because they have excellent adhesive properties, optical properties, etc.

[0041] Furthermore, the acrylic adhesive may be curable by active energy rays or not. A crosslinked type of acrylic adhesive is preferred, and a thermally crosslinked type is even more preferred.

[0042] The adhesives constituting the colored adhesive layer 111 and the colorless adhesive layer 112 may be of the same type or of different types. For example, one may be an acrylic adhesive that is curable by active energy rays, and the other may be an acrylic adhesive that is not curable by active energy rays. Even if both are acrylic adhesives that are curable by active energy rays or acrylic adhesives that are not curable by active energy rays, the composition of the adhesives and the monomer composition of the main polymer may be different.

[0043] The adhesive constituting the colored adhesive layer 111 and the adhesive constituting the colorless adhesive layer 112 are preferably obtained by crosslinking an adhesive composition (hereinafter sometimes referred to as "adhesive composition P") containing a (meth)acrylic acid ester polymer (A) and a crosslinking agent (B). In the case of the colored adhesive layer 111, it is preferable that the adhesive composition P further contains a coloring agent (C). Furthermore, if the above adhesive is an active energy ray curable adhesive, it is preferable that the adhesive composition P further contains an active energy ray curable component (D).

[0044] The adhesive obtained from such adhesive composition P can exhibit desired optical properties, adhesive strength, and surface-filling ability. In this specification, (meth)acrylic acid means both acrylic acid and methacrylic acid. The same applies to other similar terms. Furthermore, the concept of "polymer" is also included in the concept of "polymer."

[0045] Furthermore, even after the adhesive layer 11 is cured by irradiation with active energy rays, the aforementioned physical properties are still easily satisfied.

[0046] (1) Components of the adhesive composition (1-1)(meth)acrylic acid ester polymer (A) In this embodiment, the (meth)acrylic acid ester polymer (A) preferably contains a reactive group-containing monomer as a monomer unit constituting the polymer, which has a reactive group in its molecule that reacts with the crosslinking agent (B). The reactive group derived from this reactive group-containing monomer reacts with the crosslinking agent (B) to form a crosslinked structure (three-dimensional network structure), and an adhesive having the desired cohesive force is obtained.

[0047] Preferred examples of the reactive group-containing monomers include monomers having a hydroxyl group in the molecule (hydroxyl group-containing monomers), monomers having a carboxyl group in the molecule (carboxyl group-containing monomers), and monomers having an amino group in the molecule (amino group-containing monomers). Among these, hydroxyl group-containing monomers or carboxyl group-containing monomers that exhibit excellent reactivity with the crosslinking agent (B) are preferred, and hydroxyl group-containing monomers are particularly preferred.

[0048] Examples of hydroxyl group-containing monomers include hydroxyalkyl (meth)acrylate esters such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. Among these, hydroxyalkyl (meth)acrylate esters having a hydroxyalkyl group with 1 to 4 carbon atoms are preferred in terms of the reactivity of the hydroxyl group in the resulting (meth)acrylate polymer (A) with the crosslinking agent (B), copolymerizability with other monomers, and the tendency for good dispersibility of the colorant (C). Specifically, for example, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred, and 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate are particularly preferred. These may be used alone or in combination of two or more.

[0049] Examples of carboxyl group-containing monomers include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid. Among these, acrylic acid is preferred in terms of the reactivity of the carboxyl group in the resulting (meth)acrylic acid ester polymer (A) with the crosslinking agent (B) and copolymerizability with other monomers. These may be used individually or in combination of two or more.

[0050] Examples of amino group-containing monomers include aminoethyl (meth)acrylate and n-butylaminoethyl (meth)acrylate. These may be used individually or in combination of two or more. Note that nitrogen atom-containing monomers, as described later, are excluded from this list of amino group-containing monomers.

[0051] The (meth)acrylic acid ester polymer (A) preferably contains 0.1 to 50% by mass of reactive group-containing monomers as monomer units constituting the polymer, more preferably 1 to 40% by mass, particularly preferably 5 to 35% by mass, even more preferably 8 to 30% by mass, most preferably 16 to 28% by mass, and most preferably 22 to 26% by mass. When reactive group-containing monomers are contained within the above ranges, a good crosslinking structure is formed in the resulting adhesive, the desired cohesive force is obtained, and the desired physical properties such as gel fraction, storage modulus, and adhesive strength are easily satisfied. In particular, it is easier to exhibit the desired surface-filling ability and easier to satisfy the brightness difference values ​​mentioned above.

[0052] Furthermore, it is preferable that the (meth)acrylic acid ester polymer (A) does not contain carboxyl group-containing monomers as monomer units constituting the polymer. Since carboxyl groups are acidic components, by not containing carboxyl group-containing monomers, it is possible to suppress problems caused by acid (corrosion, changes in resistance, etc.) even when the object to which the adhesive is applied has transparent conductive films such as tin-doped indium oxide (ITO) or metal films present. However, it is permissible to include a predetermined amount of carboxyl group-containing monomers to the extent that such problems do not occur. Specifically, it is permissible to include carboxyl group-containing monomers as monomer units in the (meth)acrylic acid ester polymer (A) in an amount of 0.1% by mass or less, preferably 0.01% by mass or less, and more preferably 0.001% by mass or less.

[0053] The (meth)acrylic acid ester polymer (A) preferably contains an alkyl (meth)acrylic acid ester as a monomer unit constituting the polymer. This allows for good tackiness. The alkyl group may be linear or branched.

[0054] From the viewpoint of adhesiveness, alkyl (meth)acrylate esters with 1 to 20 carbon atoms in the alkyl group are preferred. Examples of alkyl (meth)acrylate esters with 1 to 20 carbon atoms in the alkyl group include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-decyl (meth)acrylate, n-dodecyl (meth)acrylate, myristyl (meth)acrylate, palmityl (meth)acrylate, and stearyl (meth)acrylate. In particular, from the viewpoint of further improving adhesiveness, (meth)acrylic acid esters with 1 to 8 carbon atoms in the alkyl group are preferred, methyl (meth)acrylate, n-butyl (meth)acrylate, or 2-ethylhexyl (meth)acrylate are especially preferred, and methyl methacrylate, n-butyl acrylate, or 2-ethylhexyl acrylate are even more preferred. These may be used individually or in combination of two or more.

[0055] The (meth)acrylic acid ester polymer (A) preferably contains 30 to 99% by mass of alkyl (meth)acrylate as a monomer unit constituting the polymer, more preferably 35 to 90% by mass, particularly preferably 40 to 80% by mass, even more preferably 45 to 70% by mass, and most preferably 50 to 60% by mass. When the content of alkyl (meth)acrylate is within the above range, the resulting adhesive can exhibit suitable tackiness and moderate flexibility, thereby exhibiting the desired ability to fill in irregularities and making it easier to satisfy the brightness difference value described above. In addition, other monomer components such as monomers containing reactive functional groups can be introduced into the (meth)acrylic acid ester polymer (A) in suitable amounts.

[0056] The above (meth)acrylic acid ester polymer (A) preferably contains monomers having an alicyclic structure within the molecule (alicyclic structure-containing monomers) as monomer units constituting the polymer. Since alicyclic structure-containing monomers are bulky, it is presumed that their presence in the polymer widens the spacing between polymers, making the resulting adhesive highly flexible. As a result, the adhesive has excellent ability to fill in irregularities and is more likely to satisfy the brightness difference value mentioned above.

[0057] In monomers containing an alicyclic structure, the carbon rings of the alicyclic structure may be saturated or may have some unsaturated bonds. Furthermore, the alicyclic structure may be monocyclic or polycyclic, such as bicyclic or tricyclic structures. From the viewpoint of appropriately controlling the distance between the resulting (meth)acrylic acid ester polymers (A) and imparting high stress relaxation properties with adhesives, the alicyclic structure is preferably a polycyclic alicyclic structure (polycyclic structure). Furthermore, considering the compatibility between the (meth)acrylic acid ester polymer (A) and other components, the polycyclic structure is particularly preferably bicyclic to tetracyclic. Also, from the viewpoint of imparting stress relaxation properties and compatibility, similar to the above, the number of carbon atoms in the alicyclic structure (referring to the total number of carbon atoms in the ring-forming portion, and the total number of carbon atoms if multiple rings exist independently) is preferably 5 to 15, and particularly preferably 7 to 10.

[0058] Examples of monomers containing the alicyclic structure mentioned above include cyclohexyl (meth)acrylate, dicyclopentanyl (meth)acrylate, adamantyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyl (meth)acrylate, and dicyclopentenyloxyethyl (meth)acrylate. Among these, dicyclopentanyl (meth)acrylate (10 carbon atoms in the alicyclic structure), adamantyl (10 carbon atoms in the alicyclic structure), or isobornyl (7 carbon atoms in the alicyclic structure) are preferred because they exhibit superior surface-filling properties. Isobornyl (meth)acrylate is particularly preferred, and isobornyl acrylate is even more preferred. These may be used individually or in combination of two or more.

[0059] When the (meth)acrylic acid ester polymer (A) contains an alicyclic structure-containing monomer as a monomer unit constituting the polymer, it is preferable that the alicyclic structure-containing monomer be present in an amount of 1 to 40% by mass, more preferably 2 to 30% by mass, particularly preferably 3 to 25% by mass, even more preferably 5 to 20% by mass, and most preferably 10 to 16% by mass. When the content of the alicyclic structure-containing monomer is within the above range, the resulting adhesive is more likely to satisfy desired physical properties such as gel fraction, storage modulus, and adhesive strength. In particular, it is easier to exhibit desired surface-filling properties and to satisfy the brightness difference values ​​mentioned above.

[0060] Furthermore, the (meth)acrylic acid ester polymer (A) may also preferably contain a nitrogen atom-containing monomer as a monomer unit constituting the polymer. By including a nitrogen atom-containing monomer as a constituent unit in the polymer, a predetermined polarity can be imparted to the adhesive, making it highly compatible with adherends that have a certain degree of polarity, such as glass. From the viewpoint of giving the (meth)acrylic acid ester polymer (A) appropriate rigidity, a monomer having a nitrogen-containing heterocycle is preferred as the nitrogen atom-containing monomer. Also, from the viewpoint of increasing the degree of freedom of the nitrogen atom-containing monomer-derived portion in the higher-order structure of the adhesive, it is preferable that the nitrogen atom-containing monomer does not contain any reactive unsaturated double bond groups other than the one polymerizable group used for polymerization to form the (meth)acrylic acid ester polymer (A).

[0061] Examples of monomers having a nitrogen-containing heterocycle include N-(meth)acryloylmorpholine, N-vinyl-2-pyrrolidone, N-(meth)acryloylpyrrolidone, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, N-(meth)acryloylaziridine, aziridinylethyl (meth)acrylate, 2-vinylpyridine, 4-vinylpyridine, 2-vinylpyrazine, 1-vinylimidazole, N-vinylcarbazole, and N-vinylphthalimide. Among these, N-(meth)acryloylmorpholine is preferred because it exhibits superior adhesive strength, and N-acryloylmorpholine is particularly preferred. These may be used individually or in combination of two or more.

[0062] When the (meth)acrylic acid ester polymer (A) contains nitrogen atom-containing monomers as monomer units constituting the polymer, it is preferable that the nitrogen atom-containing monomers are present in an amount of 0.5 to 25% by mass, more preferably 1 to 20% by mass, particularly preferably 2 to 15% by mass, even more preferably 3 to 10% by mass, and most preferably 4 to 8% by mass. When the nitrogen atom-containing monomer content is within the above range, the resulting adhesive can fully exhibit excellent adhesion to glass.

[0063] The (meth)acrylic acid ester polymer (A) may optionally contain other monomers as monomer units constituting the polymer. Among the other monomers, monomers that do not contain reactive functional groups are preferred in order not to inhibit the aforementioned effects of the reactive functional group-containing monomers. Examples of such monomers include (meth)acrylic acid alkoxyalkyl esters such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate, vinyl acetate, and styrene. These may be used individually or in combination of two or more.

[0064] The (meth)acrylic acid ester polymer (A) is preferably a linear polymer. Being a linear polymer makes it easier for molecular chains to intertwine, which can improve cohesive strength and make it easier to obtain an adhesive with excellent ability to fill in uneven surfaces.

[0065] The (meth)acrylic acid ester polymer (A) is preferably a solution polymer obtained by a solution polymerization method. Being a solution polymer makes it easier to obtain a high molecular weight polymer, which can be expected to improve cohesive strength, making it easier to obtain an adhesive with excellent surface filling properties, and consequently easier to satisfy the brightness difference value mentioned above. In addition, the colorant (C) disperses well, and the resulting adhesive is more likely to satisfy the optical properties mentioned above.

[0066] The polymerization mode of the (meth)acrylic acid ester polymer (A) may be a random copolymer or a block copolymer.

[0067] The weight-average molecular weight of the (meth)acrylic acid ester polymer (A) is preferably 100,000 to 2,000,000, more preferably 200,000 to 1,200,000, particularly preferably 300,000 to 1,000,000, even more preferably 400,000 to 800,000, and most preferably 500,000 to 700,000. When the weight-average molecular weight of the (meth)acrylic acid ester polymer (A) is within the above range, the gel fraction and storage modulus of the resulting adhesive tend to be favorable, and the ability to fill in irregularities is improved. In addition, the colorant (C) disperses well, and the resulting adhesive tends to satisfy the optical properties described above. The weight-average molecular weight in this specification is the value on a standard polystyrene basis measured by gel permeation chromatography (GPC).

[0068] In addition, in the adhesive composition P, the (meth)acrylic acid ester polymer (A) may be used alone or in combination of two or more types.

[0069] (1-2) Crosslinking agent (B) The crosslinking agent (B) crosslinks the (meth)acrylic acid ester polymer (A) upon heating of the adhesive composition P, enabling the formation of a good three-dimensional network structure. This improves the cohesive strength of the resulting adhesive, resulting in excellent surface filling properties.

[0070] The crosslinking agent (B) can be any agent that reacts with the reactive groups of the (meth)acrylic acid ester polymer (A). Examples include isocyanate crosslinking agents, epoxy crosslinking agents, amine crosslinking agents, melamine crosslinking agents, aziridine crosslinking agents, hydrazine crosslinking agents, aldehyde crosslinking agents, oxazoline crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal salt crosslinking agents, and ammonium salt crosslinking agents. Among these, if the reactive group of the (meth)acrylic acid ester polymer (A) is a hydroxyl group, it is preferable to use an isocyanate crosslinking agent that has excellent reactivity with hydroxyl groups. The crosslinking agent (B) can be used alone or in combination of two or more types.

[0071] The isocyanate-based crosslinking agent contains at least a polyisocyanate compound. Examples of polyisocyanate compounds include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate; and their biuret and isocyanurate forms, as well as adducts which are reaction products with low molecular weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Among these, trimethylolpropane-modified aromatic polyisocyanates, particularly trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate, are preferred from the viewpoint of reactivity with hydroxyl groups.

[0072] The content of the crosslinking agent (B) in the adhesive composition P is preferably 0.01 to 5 parts by mass, more preferably 0.03 to 3 parts by mass, particularly preferably 0.05 to 1 part by mass, even more preferably 0.1 to 0.5 parts by mass, and most preferably 0.12 to 0.2 parts by mass, per 100 parts by mass of the (meth)acrylic acid ester polymer (A). When the content of the crosslinking agent (B) is within the above range, the resulting adhesive tends to have desirable gel fraction, storage modulus, and adhesive strength, resulting in superior unevenness filling ability, and consequently making it easier to satisfy the brightness difference value mentioned above.

[0073] (1-3) Coloring agent (C) As the colorant (C), it is preferable to select a material that easily satisfies the aforementioned physical properties and has a desired color system. To exhibit the function of the black matrix, it is preferable to use a black colorant. The colorant (C) may be a pigment or a dye, but from the viewpoint of the function of the black matrix, it is preferable to use a pigment. The pigment may be an inorganic pigment or an organic pigment, but since the colored adhesive layer 111 in this embodiment is close to a light-emitting element that easily generates heat, it is preferable to use an inorganic pigment from the viewpoint of heat resistance and durability.

[0074] As black colorants, for example, black inorganic pigments such as carbon black, copper oxide, iron(II,III) oxide, manganese dioxide, and activated carbon can be preferably used. Among these, carbon black is preferred because it is easier to achieve the brightness difference mentioned above. These inorganic pigments may be subjected to surface treatments such as organic treatment or silicone treatment. The above colorants (C) can be mixed as appropriate depending on the purpose.

[0075] The above-mentioned black coloring agent preferably has an average haze of 0.5 to 50%, more preferably 1 to 40%, particularly preferably 1.5 to 30%, even more preferably 2 to 20%, and most preferably 3 to 10% when the coloring agent is diluted 10,000 times with ethyl acetate.

[0076] The above-mentioned black coloring agent preferably has a difference of 0.1 to 30 points, more preferably 1 to 20 points, particularly preferably 2 to 10 points or less, and even more preferably 5 to 8 points or less, between the haze value at a wavelength of 780 nm and the haze value at a wavelength of 380 nm of a solution obtained by diluting the coloring agent 10,000 times with ethyl acetate. By using an appropriate amount of such a black coloring agent, the optical properties of the resulting colored adhesive layer 111 become desirable, and therefore, the optical properties of the resulting adhesive layer 11 tend to be desirable. In addition, the function of the black matrix is ​​exhibited more effectively.

[0077] The haze value at a wavelength of 780 nm of the solution obtained by diluting the above black coloring agent 10,000 times with ethyl acetate is preferably 0.1 to 50%, particularly preferably 1 to 30%, even more preferably 1.5 to 20%, and most preferably 2 to 10%. Furthermore, the haze value at a wavelength of 380 nm of the solution obtained by diluting the above black coloring agent 10,000 times with ethyl acetate is preferably 1 to 60%, particularly preferably 5 to 40%, even more preferably 8 to 30%, and most preferably 10 to 20%. This makes it easier to satisfy the above-mentioned difference between average haze and haze value.

[0078] Furthermore, the standard deviation of the haze value of the solution obtained by diluting the above black coloring agent 10,000 times with ethyl acetate at each wavelength in the wavelength range of 380 nm to 780 nm at 5 nm intervals (i.e., 380 nm, 385 nm, 390 nm, ..., 775 nm, 780 nm) is preferably 0 to 10, more preferably 0.5 to 5, and particularly preferably 1 to 3. This results in favorable optical properties of the resulting colored adhesive layer 111, and therefore the resulting adhesive layer 11 is more likely to have favorable optical properties, and consequently, the above-mentioned brightness difference is more easily satisfied.

[0079] In the colored adhesive layer 111, the content of colorant (C) relative to 100 parts by mass of (meth)acrylic acid ester polymer (A) is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, particularly preferably 0.5 to 2 parts by mass, and even more preferably 0.8 to 1.2 parts by mass. By having the content of colorant (C) within the above range, it is easier to satisfy the optical properties described above, and consequently, the brightness difference described above. Furthermore, by having the lower limit of the content of colorant (C) as described above, it is possible to obtain the desired degree of coloring (especially the function of a black matrix in the case of a black colorant).

[0080] (1-4) Active energy ray curing component (D) When the adhesive constituting the colored adhesive layer 111 or the colorless adhesive layer 112 is an active energy ray curable adhesive, it is preferable that the adhesive composition P contains an active energy ray curable component (D). In an adhesive cured by active energy rays using an adhesive formed by crosslinking the adhesive composition P, it is presumed that the active energy ray curable components (D) polymerize with each other, and the polymerized active energy ray curable components (D) become entangled in the crosslinked structure (three-dimensional network structure) of the (meth)acrylic acid ester polymer (A). An adhesive having such a higher-order structure exhibits excellent durability and is particularly excellent in filling in uneven surfaces.

[0081] The active energy ray curable component (D) is not particularly limited as long as it is curable by irradiation with active energy rays and produces the above-mentioned effects, and may be a monomer, oligomer, or polymer, or a mixture thereof. Among these, polyfunctional acrylate monomers that have superior surface-filling properties are preferred.

[0082] Examples of polyfunctional acrylate monomers include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, tricyclodecanedimethanol(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphate di(meth)acrylate, di(acryloxyethyl) isocyanurate, allylated cyclohexyl di(meth)acrylate, ethoxylated bisphenol A diacrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluore Examples include two-functional types such as trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide-modified trimethylolpropane tri(meth)acrylate, tris(acryloxyethyl) isocyanurate, and ε-caprolactone-modified tris-(2-(meth)acryloxyethyl) isocyanurate; four-functional types such as diglycerin tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; five-functional types such as propionic acid-modified dipentaerythritol penta(meth)acrylate; and six-functional types such as dipentaerythritol hexa(meth)acrylate and caprolactone-modified dipentaerythritol hexa(meth)acrylate. These may be used individually or in combination of two or more types. Furthermore, from the viewpoint of compatibility with (meth)acrylic acid ester polymer (A), the polyfunctional acrylate monomer is preferably one with a molecular weight of less than 1000.

[0083] Among the above, from the viewpoint of the ability of the resulting adhesive to fill in unevenness, polyfunctional acrylate monomers containing an isocyanurate structure in the molecule, such as di(acryloxyethyl)isocyanurate, tris(acryloxyethyl)isocyanurate, and ε-caprolactone-modified tris-(2-(meth)acryloxyethyl)isocyanurate, or polyfunctional acrylate monomers containing a cyclic structure (especially a cycloalkane structure) in the molecule, such as tricyclodecanedimethanol(meth)acrylate, are preferred. More preferably, polyfunctional acrylate monomers that are trifunctional or more and contain an isocyanurate structure in the molecule, or polyfunctional acrylate monomers that are bifunctional or more and contain a polycyclic structure (especially a polycyclic cycloalkane structure) in the molecule are preferred. ε-caprolactone-modified tris-(2-(meth)acryloxyethyl)isocyanurate is particularly preferred, and ε-caprolactone-modified tris-(2-acryloxyethyl)isocyanurate is even more preferred.

[0084] The content of the active energy ray curable component (D) in the adhesive composition P is preferably 0.5 to 40 parts by mass, more preferably 1 to 30 parts by mass, particularly preferably 3 to 20 parts by mass, and even more preferably 5 to 15 parts by mass, per 100 parts by mass of the (meth)acrylic acid ester polymer (A). By having the active energy ray curable component (D) content within the above range, the tackiness, gel fraction, storage modulus, etc. of the adhesive after active energy ray curing can be optimized, resulting in better unevenness filling properties and, consequently, easier satisfaction of the brightness difference described above. Note that as the content of the active energy ray curable component (D) increases, the adhesive layer (especially the colored adhesive layer) becomes more easily deformed, and as a result, the brightness difference described above tends to increase. However, as mentioned above, a lower total light transmittance of the adhesive layer tends to result in a larger brightness difference, and the trend of the brightness difference may change depending on this trade-off.

[0085] (1-5) Photopolymerization initiator (E) When ultraviolet light is used as the active energy ray to cure the adhesive composition P, it is preferable that the adhesive composition P further contains a photopolymerization initiator (E). By including a photopolymerization initiator (E), the active energy ray-curable component (D) can be polymerized efficiently, and the polymerization curing time and the amount of active energy ray irradiation can be reduced.

[0086] Examples of photopolymerization initiators (E) include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)ketone, benzophenone, p-phenylbenzophenone, 4,4 Examples include '-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiary-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoic acid ester, oligo[2-hydroxy-2-methyl-1[4-(1-methylvinyl)phenyl]propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, etc. These may be used individually or in combination of two or more.

[0087] Among the above, phosphine oxide-based photopolymerization initiators are preferred because they are easily cleaved and reliably cure the adhesive even when irradiated with ultraviolet light through an ultraviolet shielding material such as a plastic plate containing an ultraviolet absorber. Specifically, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide are preferred.

[0088] The content of the photopolymerization initiator (E) in the adhesive composition P is preferably 0.5 to 40 parts by mass, more preferably 1 to 30 parts by mass, particularly preferably 3 to 20 parts by mass, and even more preferably 5 to 15 parts by mass, per 100 parts by mass of the active energy ray curable component (D). This allows for optimal values ​​of the adhesive strength, gel fraction, and storage modulus of the adhesive after active energy ray curing, resulting in superior surface filling properties and, consequently, easier satisfaction of the brightness difference mentioned above.

[0089] (1-6) Various additives The adhesive composition P may optionally contain various additives commonly used in acrylic adhesives, such as silane coupling agents, rust inhibitors, ultraviolet absorbers, antistatic agents, tackifiers, antioxidants, light stabilizers, softeners, and refractive index modifiers. The polymerization solvent and diluent solvent described later are not included in the additives constituting the adhesive composition P.

[0090] The adhesive composition P preferably contains a silane coupling agent. This improves adhesion to the adherend, whether it is plastic or glass, and provides superior unevenness-filling properties.

[0091] As a silane coupling agent, an organosilicon compound having at least one alkoxysilyl group in its molecule is preferred, which has good compatibility with the (meth)acrylic acid ester polymer (A) and is light-transmitting.

[0092] Examples of such silane coupling agents include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane; silicon compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; and mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethoxymethylsilane. Examples include amino group-containing silicon compounds such as 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane; 3-chloropropyltrimethoxysilane; 3-isocyanatetopropyltriethoxysilane; or condensates of at least one of these with alkyl group-containing silicon compounds such as methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, and ethyltrimethoxysilane. These may be used individually or in combination of two or more.

[0093] The content of the silane coupling agent in the adhesive composition P is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 1.0 parts by mass, particularly preferably 0.1 to 0.5 parts by mass, and even more preferably 0.2 to 0.3 parts by mass, per 100 parts by mass of the (meth)acrylic acid ester polymer (A). This makes it possible to improve the ability to fill in irregularities, and consequently tends to make it easier to satisfy the brightness difference mentioned above.

[0094] (2) Preparation of adhesive composition The adhesive composition P can be produced by manufacturing a (meth)acrylic acid ester polymer (A), mixing the obtained (meth)acrylic acid ester polymer (A) with a crosslinking agent (B), and optionally adding an active energy ray curable component (D), a photopolymerization initiator (E), additives, etc. In the case of a colored adhesive layer 111, a colorant (C) is further added.

[0095] (Meth)acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer using a conventional radical polymerization method. Polymerization of (meth)acrylic acid ester polymer (A) is preferably carried out by solution polymerization using a polymerization initiator if desired. However, the present invention is not limited thereto, and polymerization may also be carried out without a solvent. Examples of polymerization solvents include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc., and two or more types may be used in combination.

[0096] Examples of polymerization initiators include azo compounds and organic peroxides, and two or more may be used in combination. Examples of azo compounds include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane1-carbonitride), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), dimethyl2,2'-azobis(2-methylpropionate), 4,4'-azobis(4-cyanovaleric acid), 2,2'-azobis(2-hydroxymethylpropionitrile), and 2,2'-azobis[2-(2-imidazolin-2-yl)propane].

[0097] Examples of organic peroxides include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di(2-ethoxyethyl) peroxydicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, and diacetyl peroxide.

[0098] Furthermore, in the polymerization process described above, the weight-average molecular weight of the resulting polymer can be adjusted by incorporating a chain transfer agent such as 2-mercaptoethanol.

[0099] Once the (meth)acrylic acid ester polymer (A) is obtained, a crosslinking agent (B), and optionally a diluent, a colorant (C), an active energy ray curable component (D), a photopolymerization initiator (E), and other additives are added to the solution of the (meth)acrylic acid ester polymer (A), and thoroughly mixed to obtain a solvent-diluted adhesive composition P (coating solution). If any of the above components are used in solid form, or if precipitation occurs when mixed with other components in an undiluted state, that component may be dissolved or diluted in a diluent beforehand before mixing with the other components.

[0100] Examples of the diluent solvents used include aliphatic hydrocarbons such as hexane, heptane, and cyclohexane; aromatic hydrocarbons such as toluene and xylene; halogenated hydrocarbons such as methylene chloride and ethylene chloride; alcohols such as methanol, ethanol, propanol, butanol, and 1-methoxy-2-propanol; ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone, and cyclohexanone; esters such as ethyl acetate and butyl acetate; and cellosolve solvents such as ethyl cellosolve.

[0101] The concentration and viscosity of the coating solution prepared in this manner are not particularly limited, as long as they are within the range of coating, and can be appropriately selected depending on the situation. For example, the adhesive composition P is diluted to a concentration of 10 to 60% by mass. Note that the addition of a diluent is not a necessary condition when obtaining the coating solution; if the adhesive composition P has a viscosity suitable for coating, a diluent may not be added. In this case, the adhesive composition P becomes a coating solution in which the polymerization solvent of the (meth)acrylic acid ester polymer (A) is used directly as the diluent.

[0102] (3) Formation of the adhesive layer In this embodiment, the colored adhesive layer 111 and the colorless adhesive layer 112 are preferably made of an adhesive obtained by crosslinking the adhesive composition P (coating layer). Crosslinking of the adhesive composition P can usually be performed by heat treatment. This heat treatment can also be combined with the drying treatment used to volatilize the diluent solvent, etc., from the coating layer of the adhesive composition P applied to the desired object.

[0103] The heating temperature for the heat treatment is preferably 50 to 150°C, and more preferably 70 to 120°C. The heating time is preferably 10 seconds to 10 minutes, and more preferably 50 seconds to 2 minutes.

[0104] After heat treatment, a curing period of 1 to 2 weeks at room temperature (e.g., 23°C, 50% RH) may be allowed if necessary. If a curing period is required, the adhesive will be formed after the curing period has elapsed; if a curing period is not required, the adhesive will be formed after the heat treatment is completed.

[0105] The above heat treatment (and curing) sufficiently crosslinks the (meth)acrylic acid ester polymer (A) via the crosslinking agent (B).

[0106] The adhesive layer 11 in the adhesive sheet 1B shown in Figure 2 can be obtained by laminating a colored adhesive layer 111 and a colorless adhesive layer 112. The timing of lamination may be before or after curing each adhesive layer. However, in order to improve the adhesion between the colored adhesive layer 111 and the colorless adhesive layer 112, it is preferable to laminate them before curing each adhesive layer.

[0107] (4) Physical properties of adhesives The adhesive in this embodiment preferably has the following physical properties. (4-1) Gel fraction The gel fraction of the adhesive (overall) constituting the adhesive layer 11 is preferably 10% or more and 80% or less. This allows the adhesive to exhibit good cohesive force, resulting in improved ability to fill in irregularities, and consequently, a tendency to more easily satisfy the brightness difference described above. Furthermore, good adhesive strength is achieved, resulting in superior adhesion to the adherend. The method for measuring the gel fraction of the adhesive is as shown in the test example described later.

[0108] From the above viewpoint, the gel fraction (overall) of the adhesive is more preferably 20-75%, particularly preferably 30-70%, and even more preferably 40-60%.

[0109] When the above adhesive is curable by active energy rays, the gel fraction (overall) of the adhesive after curing by active energy rays is preferably 40% or more and 95% or less. This results in better surface filling ability, and consequently, tends to make it easier to satisfy the brightness difference mentioned above. In addition, good adhesive strength is achieved, resulting in better adhesion to the substrate.

[0110] From the above viewpoint, the gel fraction (overall) of the adhesive after curing with active energy rays is more preferably 40-95%, particularly preferably 50-85%, and even more preferably 60-80%.

[0111] The gel fraction of the adhesive (colored adhesive) constituting the colored adhesive layer 111 is preferably 2-80%, more preferably 5-70%, particularly preferably 8-60%, and even more preferably 10-50%. This allows the colored adhesive to exhibit good cohesive force, resulting in excellent unevenness filling properties, and consequently, a tendency to more easily satisfy the brightness difference mentioned above. Furthermore, good adhesive strength is more easily achieved.

[0112] When the above-mentioned colored adhesive is curable by active energy rays, the gel fraction of the colored adhesive after curing by active energy rays is preferably 25-95%, more preferably 30-85%, particularly preferably 35-80%, and even more preferably 40-70%. This results in better ability to fill in uneven surfaces, and consequently tends to make it easier to satisfy the brightness difference mentioned above. In addition, good adhesive strength is more easily achieved.

[0113] The gel fraction of the adhesive (colorless adhesive) constituting the colorless adhesive layer 112 is preferably 25-90%, more preferably 30-80%, particularly preferably 35-75%, and even more preferably 40-70%. This allows the colorless adhesive to exhibit good cohesive force, resulting in excellent ability to fill in uneven surfaces. Furthermore, good adhesive strength is easily achieved.

[0114] When the above colorless adhesive is curable by active energy rays, the gel fraction of the colorless adhesive after curing by active energy rays is preferably 45-98%, more preferably 50-90%, particularly preferably 55-85%, and even more preferably 60-80%. This results in superior ability to fill in uneven surfaces and facilitates the development of good adhesive strength.

[0115] (4-2) Storage modulus The storage modulus of the adhesive constituting the adhesive layer 11 at 23°C is preferably 0.001 MPa or more and 1 MPa or less. Having the storage modulus within this range results in superior unevenness filling properties, which in turn tends to make it easier to satisfy the brightness difference mentioned above, and also facilitates the development of good adhesive strength. In this specification, the storage modulus is the value measured by the torsional shear method at a measurement frequency of 1 Hz, in accordance with JIS K7244-6. Specifically, this is as shown in the test examples described later.

[0116] From the above viewpoint, the storage modulus is more preferably 0.005 to 0.3 MPa, particularly preferably 0.01 to 0.2 MPa, and even more preferably 0.04 to 0.15 MPa.

[0117] If the adhesive constituting any of the layers of the adhesive layer 11 is an active energy ray curable adhesive, the storage modulus of the adhesive constituting the adhesive layer 11 (as a whole) at 23°C after active energy ray curing is preferably 0.001 MPa or more and 2 MPa or less. Having the above storage modulus within this range results in superior ability to fill in irregularities, which in turn tends to make it easier to satisfy the brightness difference mentioned above, and also makes it easier to achieve good adhesive strength.

[0118] From the above viewpoint, the storage modulus after active energy ray curing is preferably 0.005 to 1.2 MPa, more preferably 0.01 to 0.8 MPa, and when the content of the active energy ray curable component (D) in the above-mentioned adhesive composition P is 20 parts by mass or less per 100 parts by mass of (meth)acrylic acid ester polymer (A), it is preferably 0.1 to 0.6 MPa, particularly preferably 0.15 to 0.42 MPa, and even more preferably 0.3 to 0.41 MPa.

[0119] (5) Thickness of the adhesive layer As shown in Figure 1, when the adhesive layer 11 consists only of a colored adhesive layer 111, the thickness of the colored adhesive layer 111 (adhesive layer 11) is preferably 10 to 1000 μm, more preferably 50 to 600 μm, particularly preferably 100 to 400 μm, and even more preferably 200 to 300 μm. When the thickness of the colored adhesive layer 111 (adhesive layer 11) is within the above range, the aforementioned physical properties are more easily satisfied in relation to the content of the colorant (C), and the desired degree of coloring and desired adhesive strength are more easily obtained. The colored adhesive layer 111 may be formed as a single layer or as multiple layers laminated together.

[0120] On the other hand, as shown in Figure 2, when the adhesive layer 11 includes a colored adhesive layer 111 and a colorless adhesive layer 112, the thickness of the colored adhesive layer 111 is preferably 2 to 200 μm, more preferably 5 to 100 μm, particularly preferably 8 to 60 μm, and even more preferably 10 to 30 μm. When the thickness of the colored adhesive layer 111 is within the above range, the aforementioned physical properties are more easily satisfied in relation to the content of the colorant (C), and the desired degree of coloring and desired adhesive strength are more easily obtained.

[0121] On the other hand, the thickness of the colorless adhesive layer 112 is preferably 10 to 1000 μm, more preferably 50 to 600 μm, particularly preferably 100 to 400 μm, and even more preferably 150 to 300 μm. When the thickness of the colorless adhesive layer 112 is within the above range, the aforementioned physical properties are more easily satisfied, and the desired adhesive strength is more easily obtained. The colorless adhesive layer 112 may be formed as a single layer, or it may be formed by laminating multiple layers.

[0122] When the adhesive layer 11 includes a colored adhesive layer 111 and a colorless adhesive layer 112, as shown in Figure 2 (adhesive sheet 1B), the thickness of the adhesive layer 11 is preferably 10 to 1200 μm, more preferably 25 to 800 μm, particularly preferably 50 to 600 μm, even more preferably 100 to 400 μm, and most preferably 150 to 300 μm. When the lower limit of the thickness of the adhesive layer 11 is as described above, it becomes easier to obtain the desired adhesive strength and excellent unevenness filling properties, and consequently, it tends to be easier to satisfy the brightness difference described above. Furthermore, when the upper limit of the thickness of the adhesive layer 11 is as described above, the processability is good, and appearance defects such as indentations are less likely to occur.

[0123] 1-2. Release sheet The release sheets 12a and 12b protect the adhesive layer 11 until the adhesive sheets 1A and 1B are used, and are peeled off when the adhesive sheets 1A and 1B (adhesive layer 11) are used. In the adhesive sheets 1A and 1B according to this embodiment, one or both of the release sheets 12a and 12b are not necessarily required.

[0124] Examples of release sheets 12a and 12b include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate film, polybutylene terephthalate film, polyurethane film, ethylene vinyl acetate film, ionomer resin film, ethylene-(meth)acrylic acid copolymer film, ethylene-(meth)acrylic acid ester copolymer film, polystyrene film, polycarbonate film, polyimide film, fluororesin film, etc. Crosslinked films of these may also be used. Furthermore, laminated films of these may also be used.

[0125] It is preferable that the release surfaces of the above-mentioned release sheets 12a and 12b (especially the surfaces in contact with the adhesive layer 11) are subjected to a release treatment. Examples of release agents used in the release treatment include alkyd, silicone, fluorine, unsaturated polyester, polyolefin, and wax-based release agents. It is preferable that the release sheet that peels off first from the adhesive layer 11 of the release sheets 12a and 12b be a light-peel type release sheet with low peeling force, and the release sheet that peels off later be a heavy-peel type release sheet with high peeling force.

[0126] There are no particular restrictions on the thickness of the release sheets 12a and 12b, but they are usually around 20 to 200 μm.

[0127] 2. Physical properties The adhesive strength of the adhesive layer 11 (or any of the colored adhesive layer 111 and the colorless adhesive layer 112 if present) to the soda-lime glass is preferably 1 to 80 N / 25 mm, more preferably 5 to 60 N / 25 mm, particularly preferably 10 to 50 N / 25 mm, and even more preferably 20 to 45 N / 25 mm. When the lower limit of the adhesive strength is set as described above, the ability to embed uneven surfaces is improved. Furthermore, when the upper limit of the adhesive strength is set as described above, good reworkability is obtained, and if a bonding error occurs, the display component, especially the expensive display component, can be reused.

[0128] If the adhesive constituting any of the layers of the adhesive layer 11 is an active energy ray curable adhesive, the adhesive strength of the adhesive layer 11 after active energy ray curing is preferably 5 to 100 N / 25 mm, more preferably 10 to 80 N / 25 mm, particularly preferably 15 to 75 N / 25 mm, and even more preferably 20 to 50 N / 25 mm. When the lower limit of the adhesive strength is as described above, the ability to embed uneven surfaces is improved. Furthermore, when the upper limit of the adhesive strength is as described above, good reworkability is obtained, and if a bonding error occurs, the display component, especially expensive display component, can be reused.

[0129] Herein, the adhesive strength referred to herein basically means the adhesive strength measured by the 180-degree peel method in accordance with JIS Z0237:2009. The measurement sample shall be 25 mm wide and 100 mm long, and the measurement sample shall be attached to the substrate, pressurized at 0.5 MPa and 50°C for 20 minutes, then left for 24 hours under normal pressure, 23°C, and 50% RH conditions, and measured at a peeling speed of 300 mm / min. Furthermore, the adhesive strength after active energy ray curing shall be the adhesive strength when the substrate is cured with active energy rays after being attached.

[0130] 3. Manufacturing of adhesive sheets As an example of manufacturing the adhesive sheet 1A according to the embodiment shown in Figure 1, a coating solution of the adhesive composition P for the colored adhesive layer 111 is applied to the release surface of one release sheet 12a (or 12b), and the adhesive composition P is crosslinked by heat treatment to form a coating layer. Then, the release surface of the other release sheet 12b (or 12a) is placed on top of the coating layer. Here, multiple release sheets with coating layers may be made and the coating layers may be laminated in any desired number. If a curing period is required, a curing period is allowed, or if a curing period is not required, the coating layer becomes the adhesive layer 11 as is. This gives the adhesive sheet 1A. The conditions for heat treatment and curing are as described above.

[0131] As an example of manufacturing the adhesive sheet 1B according to the embodiment shown in Figure 2, a coating solution of adhesive composition P for forming a colorless adhesive layer 112 is applied to the release surface of one release sheet 12a, and heat treatment is performed to crosslink the adhesive composition P and form a coating layer to obtain a release sheet 12a with a coating layer. Similarly, a coating solution of adhesive composition P for forming a colored adhesive layer 111 is applied to the release surface of the other release sheet 12b, and heat treatment is performed to crosslink the adhesive composition P and form a coating layer to obtain a release sheet 12b with a coating layer. Then, the release sheet 12a with the coating layer and the release sheet 12b with the coating layer are bonded together so that both coating layers are in contact with each other. Here, multiple release sheets with coating layers may be made, and the coating layers may be bonded together in a desired number and desired lamination order. If a curing period is required, a curing period is allowed, or if a curing period is not required, the laminated coating layers become the adhesive layer 11. This results in the adhesive sheet 1B having an adhesive layer 11 which is a laminate of a colored adhesive layer 111 and a colorless adhesive layer 112.

[0132] Furthermore, the coating layer for forming the colorless adhesive layer 112 and the coating layer for forming the colored adhesive layer 111 may each be sandwiched between two release sheets, and when bonding each coating layer, one of the release sheets may be peeled off.

[0133] Methods for applying the coating solution of the above-mentioned adhesive composition P include, for example, bar coating, knife coating, roll coating, blade coating, die coating, and gravure coating.

[0134] 4.Applications The adhesive sheet according to this embodiment is attached to a component having multiple light-emitting elements, and is preferably used to bond the component having multiple light-emitting elements to another component. Preferred types of light-emitting elements will be described later. Examples of products equipped with a "component having multiple light-emitting elements" include displays described later, as well as lights and the like.

[0135] The adhesive sheet according to this embodiment may be attached so as to be in direct contact with the light-emitting elements in a member having multiple light-emitting elements, or it may be attached via other elements. For example, the adhesive sheet according to this embodiment may be attached to a sealing resin that seals multiple light-emitting elements. The sealing resin preferably has irregularities corresponding to the multiple light-emitting elements, but the present invention is not limited thereto.

[0136] [Display body] A display body according to one embodiment of the present invention comprises one display body component, another display body component, and an adhesive layer for bonding these display body components together, wherein the adhesive layer is formed from the adhesive layer of the adhesive sheet according to the above embodiment.

[0137] At least one of the display component and the other display component has a plurality of light-emitting elements. Furthermore, at least one of the display component and the other display component may have irregularities on the adhesive layer side due to the plurality of light-emitting elements.

[0138] Both the display element component and the other display element component may be made of rigid material. According to the adhesive sheet of the embodiment described above, rigid materials can be bonded together well. In this specification, "rigid material" refers to a material whose structure can be bent at an angle of less than 90° without irreversible deformation. This angle is preferably less than 60°, more preferably less than 45°, particularly preferably less than 10°, and even more preferably less than 5°. The bendable angle (bending angle) refers to the angle at which the rigid material rises from the horizontal surface when it is placed on a horizontal surface, one end is fixed, and the opposite end is raised. The rigid material may consist of a single layer or a single material, or it may consist of multiple layers or multiple materials.

[0139] Hereinafter, an embodiment of the display body of the present invention will be described with reference to the drawings. As shown in Figures 3 to 5, the display units 2A, 2B, and 2B' according to the embodiment of the present invention are configured to include a backlight 30, an adhesive layer 11 laminated on the backlight 30, a diffusion member 41 laminated on the adhesive layer 11, and a liquid crystal panel 42 laminated on the diffusion member 41. The backlight 30 is configured to include one or more substrates 31 and a plurality of light-emitting elements 32 provided on the substrates 31. The backlight 30 has irregularities due to the plurality of light-emitting elements 32.

[0140] The adhesive layer 11 in the display unit 2A shown in Figure 3 consists of a colored adhesive layer 111, which fills in the irregularities (especially the recesses) caused by the light-emitting element 32. This adhesive layer 11 in the display unit 2A is the same adhesive layer 11 as the adhesive sheet 1A shown in Figure 1.

[0141] The adhesive layer 11 in the display unit 2B shown in Figure 4 is a laminate of a colorless adhesive layer 112 and a colored adhesive layer 111, with the colored adhesive layer 111 positioned so as to be in contact with the substrate 31 of the backlight 30, and the colored adhesive layer 111 filling in the irregularities (especially the recesses) caused by the light-emitting element 32. This adhesive layer 11 in the display unit 2B is the same adhesive layer 11 as the adhesive sheet 1B shown in Figure 2. In this embodiment, the colored adhesive layer 111 and the colorless adhesive layer 112 may also fill in the recesses caused by the irregularities of the light-emitting element 32.

[0142] The adhesive layer 11 in the display unit 2B' shown in Figure 5 is a laminate of a colored adhesive layer 111 and a colorless adhesive layer 112, with the colorless adhesive layer 112 positioned in contact with the substrate 31 of the backlight 30, and the colorless adhesive layer 112 and the colored adhesive layer 111 filling in the irregularities (especially recesses) caused by the light-emitting element 32. This adhesive layer 11 in the display unit 2B' is the same adhesive layer 11 as the adhesive sheet 1B shown in Figure 2.

[0143] Here, the backlight 30 in the above-mentioned display bodies 2A, 2B, and 2B' corresponds to the first display body component, and the laminate including the diffusion member 41 and the liquid crystal panel 42 corresponds to the second display body component.

[0144] The substrate 31 for the backlight 30 is not particularly limited, and any substrate commonly used for backlights can be used. This substrate 31 is usually a printed circuit board (PCB).

[0145] The substrate 31 may be integrally formed so that multiple light-emitting elements 32 are mounted together, or each substrate 31 may be formed separately so that one light-emitting element 32 is mounted on each substrate 31. If formed separately, each substrate 31 is usually fixed to a frame, support, housing, etc. In this embodiment, as shown in Figures 3 to 5, it is preferable that the substrate 31 is integrally formed so that multiple light-emitting elements 32 are mounted together.

[0146] A reflective layer may be formed on the side of the substrate 31 facing the adhesive layer 11, or a reflective member may be provided. This effectively improves the brightness provided by the backlight 30. Known materials can be used for the reflective layer and reflective member.

[0147] Examples of the types of light-emitting elements 32 include light-emitting diodes (LEDs), laser diodes (LDs), organic electroluminescent light-emitting elements, and inorganic electroluminescent light-emitting elements. Among these, LEDs are preferred from the viewpoint of their ability to fill in irregularities by the adhesive layer 11, and mini-LEDs or micro-LEDs are particularly preferred. The light-emitting elements 32 may be independent of each color, such as a red (R) light-emitting element, a green (G) light-emitting element, and a blue (B) light-emitting element, or red (R), green (G), and blue (B) may be combined into a single light-emitting element 32.

[0148] The thickness of the light-emitting element 32 is preferably 10 μm or more, more preferably 30 μm or more, particularly preferably 50 μm or more, and even more preferably 80 μm or more. Furthermore, the thickness of the light-emitting element 32 is preferably 300 μm or less, particularly preferably 150 μm or less, and even more preferably 100 μm or less.

[0149] Furthermore, the width of the gap between adjacent light-emitting elements 32 is preferably 0.01 mm or more, particularly preferably 0.1 mm or more, and even more preferably 0.5 mm or more. In addition, the width of the above gap is preferably 100 mm or less, more preferably 10 mm or less, particularly preferably 4 mm or less, and even more preferably 2 mm or less.

[0150] The shape of the light-emitting body 32 is not particularly limited, but is usually rectangular, hemispherical, etc. The size of the light-emitting body 32 is also not particularly limited, but from the viewpoint of embedding into uneven surfaces, the side or diameter in plan view is preferably 0.01 to 100 mm, more preferably 0.1 to 10 mm, particularly preferably 0.2 to 5 mm, and even more preferably 0.5 to 2 mm.

[0151] The diffusion member 41 is a member that diffuses the light emitted from the backlight 30, and this diffusion member 41 can effectively suppress the occurrence of brightness unevenness. The diffusion member 41 can be a known type, for example, a diffusion plate, a diffusion film, or a combination thereof. The liquid crystal panel 42 can also be a known type.

[0152] Furthermore, a desired optical element may be provided between the adhesive layer 11 and the diffusion member 41, between the diffusion member 41 and the liquid crystal panel 42, or on the surface of the liquid crystal panel 42 opposite to the diffusion member 41. Examples of such optical elements include brightness-enhancing films, contrast-enhancing films, viewing angle compensation films, transparent conductive films, liquid crystal polymer films, semi-transparent reflective films, and shatterproof films.

[0153] To manufacture the display unit 2A according to the embodiment shown in Figure 3, for example, one release sheet 12a of the adhesive sheet 1A shown in Figure 1 is peeled off, and the exposed adhesive layer 11 (colored adhesive layer 111) is bonded to the side of the backlight 30 where the light-emitting element 32 is located. Next, the other release sheet 12b is peeled off from the adhesive layer 11 of the adhesive sheet 1A, and the exposed adhesive layer 11 (colored adhesive layer 111) is bonded to the diffusion member 41.

[0154] To manufacture the display unit 2B according to the embodiment shown in Figure 4, for example, one release sheet 12b of the adhesive sheet 1B shown in Figure 2 is peeled off, and the exposed colored adhesive layer 111 is bonded to the side of the backlight 30 where the light-emitting element 32 is located. Next, the other release sheet 12a is peeled off from the adhesive layer 11 of the adhesive sheet 1B, and the exposed colorless adhesive layer 112 is bonded to the diffusion member 41.

[0155] To manufacture the display body 2B' according to the embodiment shown in Figure 5, for example, one release sheet 12a of the adhesive sheet 1B shown in Figure 2 is peeled off, and the exposed colorless adhesive layer 112 is bonded to the side of the backlight 30 where the light-emitting element 32 is located. Next, the other release sheet 12b is peeled off from the adhesive layer 11 of the adhesive sheet 1B, and the exposed colored adhesive layer 111 is bonded to the diffusion member 41.

[0156] In either case, if the adhesive layer 11 (colored adhesive layer 111 and / or colorless adhesive layer 112) is curable by active energy rays, the adhesive layer 11 is irradiated with active energy rays. This causes the energy-ray curable component (C) in the adhesive layer 11 to polymerize, and the adhesive layer 11 hardens. The irradiation of the adhesive layer 11 with energy rays is usually performed through either the first display component 21 or the second display component 22.

[0157] Active energy rays refer to electromagnetic waves or charged particle beams that possess energy quanta, specifically including ultraviolet rays and electron beams. Among active energy rays, ultraviolet rays are particularly preferred because they are easy to handle.

[0158] Ultraviolet irradiation can be performed using high-pressure mercury lamps, fusion H lamps, xenon lamps, etc., with an illuminance of 50 to 1000 mW / cm². 2 It is preferable that the level be around 100-500 mW / cm². 2 It is preferable that the light intensity be around 50 to 10,000 mJ / cm². 2 Preferably, the concentration is 200-7000 mJ / cm². 2It is more preferable that the concentration be 500-3000 mJ / cm². 2 It is particularly preferable that this is the case. On the other hand, electron beam irradiation can be performed by an electron beam accelerator or the like, and the electron beam irradiation dose is preferably about 10 to 1000 krad.

[0159] Subsequently, the diffusion member 41 and the liquid crystal panel 42 are bonded together using a desired adhesive sheet. Alternatively, as another example, the bonding order of the backlight 30 and the diffusion member 41 may be reversed.

[0160] In the display units 2A, 2B, and 2B' according to this embodiment, the adhesive layer 11 has the aforementioned optical properties, so that the adhesive layer 11 can suppress a decrease in the brightness of the light-emitting elements 32 while allowing the colored adhesive layer 111 to exist between the light-emitting elements 32 (in the recesses of the unevenness caused by the light-emitting elements 32). This effectively suppresses the mixing of colors (R, G, B) of adjacent light-emitting elements 32 and the resulting color bleeding, while maintaining sufficient brightness of the light-emitting elements 32. In particular, when the colored adhesive layer 111 is black, the function as a black matrix is ​​more effectively exhibited, resulting in superior display performance for the display units 2A, 2B, and 2B'.

[0161] The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit it. Accordingly, each element disclosed in the above embodiments is intended to include all design modifications and equivalents that fall within the technical scope of the present invention.

[0162] For example, either or both of the release sheets 12a and 12b in the adhesive sheets 1A and 1B may be omitted, and a desired optical component may be laminated in place of the release sheets 12a and / or 12b. Furthermore, the adhesive layer 11 may consist of a colorless adhesive layer 112, a colored adhesive layer 111, and a colorless adhesive layer 112 laminated in that order.

[0163] Furthermore, multiple light-emitting elements 32 may be sealed in another sealing resin, and an adhesive layer 11 may be attached to the sealing resin.

[0164] In this specification, when "X~Y" (where X and Y are any numbers) is written, unless otherwise specified, it includes the meaning of "greater than or equal to X and less than or equal to Y," as well as "preferably greater than X" or "preferably less than Y." Similarly, when "greater than or equal to X" (where X is any number) is written, unless otherwise specified, it includes the meaning of "preferably greater than X," and when "less than or equal to Y" (where Y is any number) is written, unless otherwise specified, it also includes the meaning of "preferably less than Y." [Examples]

[0165] The present invention will be described in more detail below with reference to examples, but the scope of the present invention is not limited to these examples.

[0166] [Example 1] 1. Preparation of (meth)acrylic acid ester polymers (Meth)acrylic acid ester polymer (A) was prepared by copolymerizing 27.5 parts by mass of n-butyl acrylate, 27.5 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of isobornyl acrylate, 5 parts by mass of N-acryloylmorpholine, and 25 parts by mass of 2-hydroxyethyl acrylate by solution polymerization. The molecular weight of this (meth)acrylic acid ester polymer (A) was measured by the method described later and found to be a weight-average molecular weight (Mw) of 500,000.

[0167] 2. Preparation of adhesive composition 100 parts by mass (solid content equivalent; the same applies hereinafter) of the (meth)acrylic acid ester polymer (A) obtained in step 1 above, 0.15 parts by mass of trimethylolpropane-modified tolylene diisocyanate (manufactured by Mitsui Chemicals, product name "Takenate D101E") as a crosslinking agent (B), 1.00 part by mass of carbon black-based black pigment (C1) as a coloring agent (C), and 0.25 parts by mass of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent were mixed, stirred thoroughly, and diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

[0168] Here, Table 1 shows the respective formulations (solid content equivalent) of the adhesive composition when (meth)acrylic acid ester polymer (A) is present in 100 parts by mass (solid content equivalent). Details of the abbreviations and other terms listed in Table 1 are as follows. [Coloring agent (C)] C1~C2: Carbon black-based black pigments having the physical properties shown in Table 2.

[0169] 3. Preparation of colored adhesive sheets The adhesive composition coating solution obtained in step 2 above was applied with a knife coater to the peeled surface of a heavy-peel type release sheet (Lintec Corporation, product name "SP-PET752150"), in which one side of a polyethylene terephthalate film was peeled with a silicone-based release agent, and then heated at 90°C for 1 minute to form a coating layer (thickness: 25 μm).

[0170] Next, the coating layer on the heavy-peel release sheet obtained above and a light-peel release sheet (Lintec Corporation, product name "SP-PET381031"), which was obtained by peeling one side of a polyethylene terephthalate film with a silicone-based release agent, were bonded together so that the peeled surface of the light-peel release sheet was in contact with the coating layer, thereby producing a colored adhesive sheet consisting of a heavy-peel release sheet / colored adhesive layer (a) (thickness: 25 μm) / light-peel release sheet.

[0171] The thickness of the colored adhesive layer and the colorless adhesive layer described later were measured in accordance with JIS K7130 using a constant-pressure thickness measuring instrument (TECLOCK Co., Ltd., product name "PG-02") (the same applies hereinafter).

[0172] 4. Preparation of colorless adhesive sheets 100 parts by mass of the (meth)acrylic acid ester polymer (A) obtained in step 1 above, 0.15 parts by mass of trimethylolpropane-modified tolylene diisocyanate (manufactured by Mitsui Chemicals, product name "Takenate D101E") as a crosslinking agent (B), 8 parts by mass of ε-caprolactone-modified tris-(2-acryloxyethyl) isocyanurate (manufactured by Shin Nakamura Chemical Co., Ltd., product name "NK Ester A-9300-1CL") as an active energy ray curable component (D), 0.8 parts by mass of 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide as a photopolymerization initiator (E), and 0.25 parts by mass of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent were mixed, stirred thoroughly, and diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

[0173] The coating solution of the adhesive composition was applied to the release surface of a heavy-peel release sheet (Lintec Corporation, product name "SP-PET752150") using a knife coater, in the same manner as in step 3 above, and then heated at 90°C for 1 minute to form a coating layer (thickness: 50 μm). The coating layer and a light-peel release sheet (Lintec Corporation, product name "SP-PET381031") were bonded together so that the release surface of the light-peel release sheet was in contact with the coating layer, thereby producing a colorless adhesive sheet (50) consisting of a heavy-peel release sheet / colorless adhesive layer (thickness: 50 μm) / light-peel release sheet.

[0174] Furthermore, two adhesive sheets were prepared by peeling off the light-peel release liner of a colorless adhesive sheet (50) to expose the colorless adhesive layer (thickness: 50 μm). By bonding the colorless adhesive layers together, a colorless adhesive sheet (100) consisting of a heavy-peel release liner / colorless adhesive layer (thickness: 100 μm) / heavy-peel release liner was produced. In addition, two adhesive sheets were prepared by peeling off one of the heavy-peel release liners of a colorless adhesive sheet (100) to expose the colorless adhesive layer (thickness: 100 μm). By bonding the colorless adhesive layers together, a colorless adhesive sheet (200 μm) consisting of a heavy-peel release liner / colorless adhesive layer (thickness: 200 μm) / heavy-peel release liner was produced.

[0175] 5. Manufacturing of adhesive sheets In step 3 above, the light-peel release sheet was peeled off from the colored adhesive sheet to expose the colored adhesive layer. Also, in step 4 above, one of the heavy-peel release sheets was peeled off from the colorless adhesive sheet (200) to expose the colorless adhesive layer. The exposed colored adhesive layer and the colorless adhesive layer were bonded together and then cured for 7 days under conditions of 23°C and 50% RH. In this way, a laminate consisting of a heavy-peel release sheet / colored adhesive layer (25 μm) / colorless adhesive layer (200 μm) / heavy-peel release sheet was manufactured.

[0176] Next, the double-peel release sheet on the colorless adhesive layer side was peeled off from the laminate, and the exposed colorless adhesive layer was laminated to the easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100 μm) having an easy-adhesion layer, thereby producing an adhesive sheet consisting of PET film (100 μm) / colorless adhesive layer (second layer; 200 μm) / colored adhesive layer (first layer; 25 μm) / double-peel release sheet. Of the first and second layers, the first layer is assumed to be the layer that first comes into contact with the adherend.

[0177] [Examples 2-10, 12] A colored adhesive sheet was prepared in the same manner as in Example 1, except that the amount of crosslinking agent (B), the type and amount of colorant (C), the amounts of active energy ray curable component (D) and photopolymerization initiator (E), and the thickness of the colored adhesive layer were changed as shown in Table 1. Then, using this colored adhesive sheet, an adhesive sheet was manufactured in the same manner as in Example 1.

[0178] Furthermore, ε-caprolactone-modified tris-(2-acryloxyethyl) isocyanurate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NK Ester A-9300-1CL") was used as the active energy ray-curable component (D), and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide was used as the photopolymerization initiator (E). The amount of photopolymerization initiator (E) was 10 parts by mass per 100 parts by mass of the active energy ray-curable component (D).

[0179] [Example 11] A colored adhesive sheet was prepared in the same manner as in Example 1, except that the type and amount of colorant (C), the amount of active energy ray curable component (D) and photopolymerization initiator (E), and the thickness of the colored adhesive layer were changed as shown in Table 1. The colored adhesive layer was made 250 μm thick by laminating multiple colored adhesive layers.

[0180] Next, the light-peel release sheet was peeled off the colored adhesive sheet, and the exposed colored adhesive sheet was laminated to the easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100 μm) having an easy-adhesion layer. In this way, an adhesive sheet consisting of a PET film (100 μm) / colored adhesive layer (250 μm) / heavy-peel release sheet was manufactured.

[0181] [Example 13] A laminate was manufactured in the same manner as in Example 9. Next, the double-peel release sheet on the colored adhesive layer side was peeled off from the laminate, and the exposed colored adhesive layer was bonded to the easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100 μm) having an easy-adhesion layer. In this way, an adhesive sheet consisting of a PET film (100 μm) / colored adhesive layer (first layer; 25 μm) / colorless adhesive layer (second layer; 200 μm) / double-peel release sheet was manufactured.

[0182] [Comparative Example 1] The colored adhesive layer of a colored adhesive sheet, prepared in the same manner as in Example 1, was irradiated with active energy rays (ultraviolet light; UV) through a light-peel release sheet under the following conditions to cure the colored adhesive layer.

[0183] <Activated energy ray irradiation conditions> • Use of high-pressure mercury lamps ·Illuminance 200mW / cm 2 ,Light intensity 2000mJ / cm 2 • The UV irradiance / light intensity meter used is the "UVPF-A1" manufactured by iGraphics Co., Ltd.

[0184] Using the colored adhesive sheet having the colored adhesive layer after curing described above, an adhesive sheet was manufactured in the same manner as in Example 13. Specifically, an adhesive sheet consisting of a PET film (100 μm) / a colored adhesive layer after curing (second layer; 25 μm) / a colorless adhesive layer (first layer; 200 μm) / a double-peel release sheet was manufactured.

[0185] [Comparative Example 2] One of the double-peel release sheets was peeled off from the colorless adhesive sheet (100) prepared in step 4 above, exposing the colorless adhesive layer. The exposed colorless adhesive layer was laminated to the easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100 μm) having an easy-adhesion layer, thereby creating a laminate consisting of PET film (100 μm) / colorless adhesive layer (100 μm) / double-peel release sheet.

[0186] Next, the double-peel release sheet was peeled off the laminate, and the exposed colorless adhesive layer was bonded to a black-colored PET film (manufactured by Mitsubishi Chemical Corporation, product name "DIAFOIL Z945E25[U07-901], thickness 25 μm, hereinafter referred to as "colored PET film") to create a laminate consisting of PET film (100 μm) / colorless adhesive layer (100 μm) / colored PET film (25 μm). Furthermore, one of the double-peel release sheets was peeled off from the colorless adhesive sheet (100) prepared in step 4 above, and the exposed colorless adhesive layer was bonded to the colored PET film of the laminate. After that, it was cured for 7 days under conditions of 23°C and 50% RH. In this way, an adhesive sheet consisting of a PET film (100 μm), a colorless adhesive layer (100 μm), a colored PET film (25 μm), a colorless adhesive layer (100 μm), and a double-peel release sheet was manufactured.

[0187] [Comparative Example 3] A colorless adhesive sheet (250) was produced by laminating a colorless adhesive layer (50 μm) exposed by peeling off the light-peel release sheet of the colorless adhesive sheet (50) produced in step 4 above with a colorless adhesive layer (200 μm) exposed by peeling off one of the heavy-peel release sheets of the colorless adhesive sheet (200) produced in step 4 above. This resulted in the production of a colorless adhesive sheet (250 μm) consisting of a heavy-peel release sheet / colorless adhesive layer (250 μm) / heavy-peel release sheet. The heavy-peel release sheet was peeled off from this colorless adhesive sheet (250), and the exposed colorless adhesive layer was laminated to one side of a colored PET film (manufactured by Mitsubishi Chemical Corporation, product name "DIAFOIL Z945E25 [U07-901], thickness 25 μm). In this way, an adhesive sheet consisting of a colored PET film (25 μm) / colorless adhesive layer (250 μm) / heavy-peel release sheet was produced.

[0188] [Comparative Example 4] In the same manner as in Comparative Example 3, the double-peel release sheet was peeled from the colorless adhesive sheet (250), and the exposed colorless adhesive sheet was laminated to the easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100 μm) having an easy-adhesion layer. In this way, an adhesive sheet consisting of a PET film (100 μm) / colorless adhesive layer (250 μm) / double-peel release sheet was manufactured.

[0189] The weight-average molecular weight (Mw) mentioned above is the weight-average molecular weight in polystyrene terms, measured using gel permeation chromatography (GPC) under the following conditions (GPC measurement). <Measurement conditions> • GPC measuring device: Tosoh Corporation, HLC-8020 • GPC column (passes through in the following order): Manufactured by Tosoh Corporation TSK Guard Column HXL-H TSK gel GMHXL (x2) TSK gel G2000HXL • Measurement solvent: tetrahydrofuran ·Measurement temperature: 40℃

[0190] [Test Example 1] (Measurement of gel fraction) The colored adhesive sheets, colorless adhesive sheets, and adhesive sheets prepared in the examples and comparative examples were cut to a size of 80 mm x 80 mm. Each adhesive layer was wrapped in a polyester mesh (mesh size 200), and the mass was weighed using a precision balance. The mass of the mesh alone was subtracted to calculate the mass of the adhesive only. This mass is denoted as M1.

[0191] Next, the adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23°C) for 24 hours. The adhesive was then removed and air-dried for 24 hours at 23°C and 50% relative humidity, followed by 12 hours of drying in an oven at 80°C. After drying, its mass was measured using a precision balance, and the mass of the adhesive alone was calculated by subtracting the mass of the mesh alone. This mass was denoted as M2. The gel fraction (%) is expressed as (M2 / M1) × 100. This allowed for the derivation of the gel fraction of the adhesive (before UV exposure). The results are shown in Table 3.

[0192] Furthermore, the colored adhesive sheets, colorless adhesive sheets, and adhesive layers of the adhesive sheets prepared in the examples and comparative examples were irradiated with active energy rays (ultraviolet light; UV) under the following conditions to cure the adhesive layers. The gel fraction (after UV) of the adhesive in the cured adhesive layer was derived in the same manner as described above. The results are shown in Table 3.

[0193] <Activated energy ray irradiation conditions> • Use of high-pressure mercury lamps ·Illuminance 200mW / cm 2 ,Light intensity 2000mJ / cm 2 • The UV irradiance / light intensity meter used is the "UVPF-A1" manufactured by iGraphics Co., Ltd.

[0194] [Test Example 2] (Measurement of Storage Modulus) The release sheets were peeled off from the adhesive sheets manufactured in the examples and comparative examples, and multiple layers of adhesive were laminated to a thickness of 3 mm. From the resulting laminate of adhesive layers, a cylindrical body with a diameter of 8 mm (height 3 mm) was punched out and used as a sample.

[0195] For the above samples, the storage modulus (before UV exposure; MPa) at 23°C was measured using the torsional shear method with a viscoelasticity measuring device (Physica, product name "MCR300") in accordance with JIS K7244-6, under the following conditions. The results are shown in Table 3. Measurement frequency: 1Hz Measurement temperature: 23℃

[0196] Furthermore, the same sample as described above was irradiated with active energy rays (ultraviolet light; UV) under the same conditions as in Test Example 1 to cure the adhesive, thereby obtaining a sample after active energy ray irradiation. The storage modulus (after UV; MPa) at 23°C was measured for the obtained sample after active energy ray irradiation in the same manner as for the sample before active energy ray irradiation. The results are shown in Table 3.

[0197] [Test Example 3] (Measurement of total light transmittance) The adhesive layers of the adhesive sheets manufactured in the examples and comparative examples were bonded to glass to serve as measurement samples. After background measurements were performed on the glass, the total light transmittance (%) of the measurement samples was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH-7000") in accordance with JIS K7361-1:1997. The results are shown in Table 3.

[0198] [Test Example 4] (Measurement of haze value) The haze value (%) of the adhesive layer of the adhesive sheets manufactured in the examples and comparative examples was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH-7000") in accordance with JIS K7136:2000. The results are shown in Table 3.

[0199] [Test Example 5] (Measurement of L*a*b*) For the adhesive layers of the adhesive sheets manufactured in the examples and comparative examples, the chromaticity a* and chromaticity b* defined by the CIE1976L*a*b* color system were measured in transmitted light using a simultaneous photometric spectrophotometer (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SQ2000"). The results are shown in Table 3.

[0200] [Test Example 6] (Measurement of Adhesion) The adhesive sheets produced in the examples and comparative examples were cut to a width of 25 mm and a length of 100 mm to serve as samples. Under conditions of 23°C and 50% RH, the heavy-peel release sheet was peeled from the samples, and the exposed adhesive layer was attached to soda-lime glass (manufactured by Nippon Sheet Glass Co., Ltd.). The samples were then subjected to pressure of 0.5 MPa and 50°C for 20 minutes in an autoclave manufactured by Kurihara Seisakusho Co., Ltd. After leaving the samples for 24 hours under conditions of 23°C and 50% RH, the adhesive strength (before UV testing; N / 25 mm) was measured using a tensile testing machine (manufactured by Orientec Co., Ltd., product name "Tensilon") at a peeling speed of 300 mm / min and a peeling angle of 180 degrees. Measurements under conditions other than those described herein were performed in accordance with JIS Z0237:2009. The results are shown in Table 3.

[0201] Furthermore, the adhesive sheets produced in the examples and comparative examples were attached to soda-lime glass in the same manner as described above, autoclaved, and left for 24 hours under conditions of 23°C and 50% RH. Then, the adhesive layer was cured by irradiating it with active energy rays through a PET film (colored PET film in Comparative Example 3) under the same conditions as in Test Example 1. The adhesive strength (after UV; N / 25mm) of the cured adhesive layer was measured in the same manner as described above. The results are shown in Table 3.

[0202] [Test Example 7] (Evaluation of unevenness embedding ability / Brightness measurement) A 50 μm thick PET film was laminated with a 25 μm adhesive, and then cut into strips 700 mm long and 3 mm wide. Multiple such strips were prepared. The cut adhesive-backed PET films were attached to a 1.1 mm thick soda-lime glass (700 mm x 700 mm) at 3 mm intervals, parallel to each other. In this way, a transparent substrate (700 mm x 700 mm) was obtained in which multiple protrusions, each 75 μm high and 3 mm wide, extended at 3 mm intervals, with recesses between adjacent protrusions.

[0203] The release liner was peeled off the adhesive sheets produced in the examples and comparative examples, and the exposed adhesive layer was applied to the uneven surface of the transparent substrate. The sheets were then autoclaved at 50°C and 0.5 MPa for 30 minutes, and then left at atmospheric pressure, 23°C, and 50% RH for 24 hours to be used as samples.

[0204] For reference, see Figure 4 for the sample configurations of Examples 1-10 and 12, Figure 3 for the sample configuration of Example 11, and Figure 5 for the sample configuration of Example 13.

[0205] The obtained sample was 300 cd / m² 2 Placed on a white light source, the luminance (cd / m²) in the portion of the transparent substrate corresponding to the convex part is measured by transmitted light. 2 The brightness (cd / m²) was measured and the average value of three locations was calculated. Similarly, the brightness (cd / m²) in the part corresponding to the recess of the transparent substrate was measured. 2 The brightness was measured at three locations, and the average value was calculated. The brightness in the convex and concave areas was measured at a position 0.5 mm from the boundary line. A Konica Minolta PROMATRIC IP-PMY16 imaging luminance meter was used to measure the brightness.

[0206] The average value of luminance (cd / m²) in the portion corresponding to the convex part obtained above 2 ) From this, the average brightness (cd / m²) in the part corresponding to the recess 2 The brightness difference was calculated by subtracting ( ). The results for each are shown in Table 3.

[0207] Furthermore, the ability to embed uneven surfaces was evaluated for each sample based on the following criteria. The results are shown in Table 3. ○...No bubbles, lifting, or peeling were observed at the interface between the transparent substrate and the adhesive layer, and the recesses were completely filled by the adhesive layer, indicating good unevenness filling ability. ×... Bubbles, lifting, and peeling were observed at the interface between the transparent substrate and the adhesive layer, and the recesses were not completely filled by the adhesive layer, resulting in poor unevenness filling performance.

[0208] [Test Example 8] (Evaluation of Black Matrix Formation Performance) In Test Example 7, the luminance difference was 10 cd / m². 2 Those meeting the above criteria, and also demonstrating excellent (〇) ability to embed uneven surfaces, were judged to have particularly superior (◎) black matrix formation performance, with a brightness difference of 7 cd / m². 2 More than 10cd / m 2 If the value is less than 5 cd / m² and the ability to embed unevenness is rated as 〇, it is judged to have excellent black matrix formation performance (〇), and the brightness difference is 5 cd / m². 2 More than 7cd / m 2 If the value was less than 5 cd / m² and the ability to embed unevenness was rated as 〇, it was judged to have poor black matrix formation performance (△), and the brightness difference was 5 cd / m². 2 Samples that were less than [a certain value] or had a negative result for unevenness embedding were judged to lack black matrix formation performance (×). The results are shown in Table 3.

[0209] [Table 1]

[0210] [Table 2]

[0211] [Table 3]

[0212] Table 3 shows that the adhesive sheets manufactured in the examples exhibited excellent black matrix formation performance and are therefore suitable for attachment to components having multiple light-emitting elements. [Industrial applicability]

[0213] The adhesive sheet of the present invention is suitably used to form a black matrix by being attached to a component having multiple light-emitting elements (particularly mini-LEDs or micro-LEDs). [Explanation of symbols]

[0214] 1A, 1B... Adhesive sheets 11…Adhesive layer 111…Colored adhesive layer 112…Colorless adhesive layer 12a, 12b… Release sheets 2A,2B,2B'...Display body 30... Backlight 31... Circuit board 32... Luminous body 41…Diffusion member 42… LCD panel

Claims

1. An adhesive sheet to be attached to a component having multiple light-emitting elements, It comprises an adhesive layer including at least one colored adhesive layer, A laminate obtained by applying the adhesive layer to a transparent substrate having multiple protrusions, each 75 μm high and 3 mm wide, extending at 3 mm intervals, with recesses between adjacent protrusions, is subjected to a density of 300 cd / m². ２ When placed on a white light source and the luminance of the transmitted light is measured, the luminance (cd / m²) in the portion corresponding to the convex portion is measured. ２ ) from the brightness (cd / m²) in the portion corresponding to the recess ２ The brightness difference after subtracting ) is 5 cd / m² ２ That's all. An adhesive sheet characterized by the following features.

2. The adhesive sheet according to claim 1, characterized in that the total light transmittance of the adhesive layer is 1% or more and 95% or less.

3. The adhesive sheet according to claim 1, characterized in that the haze value of the adhesive layer is 0.1% or more and 80% or less.

4. The adhesive sheet according to claim 1, characterized in that the gel fraction of the adhesive constituting the adhesive layer is 10% or more and 80% or less.

5. The adhesive sheet according to claim 1, characterized in that the adhesive layer is curable by active energy rays, and the gel fraction of the adhesive constituting the adhesive layer after curing by active energy rays is 40% or more and 95% or less.

6. The adhesive sheet according to claim 1, characterized in that the adhesive layer is a laminate of at least one colored adhesive layer and at least one colorless adhesive layer.

7. The adhesive layer is an adhesive layer for bonding one display component to another display component. At least one of the first display component and the other display component has the light-emitting element. The adhesive sheet according to feature 1.

8. The adhesive sheet according to claim 7, characterized in that at least one of the one display component and the other display component has irregularities on the side to which it is bonded by the adhesive layer.

9. The adhesive sheet according to claim 8, characterized in that the aforementioned irregularities are irregularities caused by a plurality of light-emitting elements.

10. Two release sheets, The adhesive layer sandwiched between the two release sheets so as to be in contact with the release surfaces of the two release sheets, The adhesive sheet according to claim 1, characterized by comprising the above.

11. One display component, Other display component members, An adhesive layer that bonds the first display component and the other display component to each other. A display body equipped with, At least one of the one display component and the other display component has a plurality of light-emitting elements. The adhesive layer is formed from the adhesive layer of the adhesive sheet described in any one of claims 1 to 10. A display unit characterized by the following features.

12. The display body according to claim 11, characterized in that at least one of the one display body component and the other display body component has irregularities on the surface to which it is bonded by the adhesive layer.

13. The display body according to claim 12, characterized in that the aforementioned irregularities are irregularities caused by a plurality of light-emitting elements.

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