KR20220107954A - Optical laminate and display device - Google Patents

Abstract

Provided is an optical laminate. The optical laminate has a first optical member, an adhesive layer, and a second optical member in this order. The first optical member includes a front surface plate and a coloring plate. The second optical member includes a polarizer. An area of the first optical member viewed in a lamination direction is bigger than an area of the second optical member viewed in a lamination direction.

Description

Optical laminate and display device {OPTICAL LAMINATE AND DISPLAY DEVICE}

The present invention relates to an optical laminate and a display device.

Japanese Patent Application Laid-Open No. 2018-027995 discloses a flexible image display device having a pressure-sensitive adhesive layer having excellent stress relaxation properties.

When the image display device including an adhesive layer was bent, there existed a problem that floatation and peeling were easy to generate|occur|produce between an adhesive layer and a to-be-adhered member. An object of this invention is to provide the optical laminated body by which peeling in an adhesive layer is suppressed even if it bends, and the display device containing the said optical laminated body.

The present invention provides an optical laminate and a display device exemplified below.

[1] A first optical member, an adhesive layer, and a second optical member are provided in this order,

The first optical member includes a front plate and a colored layer,

The second optical member includes a polarizer,

The optical laminated body whose area when the said 1st optical member is seen from the lamination direction is larger than the area when the said 2nd optical member is seen from the lamination direction.

[2] The optical laminate according to [1], wherein the ratio of the area when the first optical member is viewed in the lamination direction to the area when the second optical member is viewed in the lamination direction is 98.0% or more and 99.9% or less. .

[3] The difference between the area when the first optical member is viewed in the lamination direction and the area when the second optical member is viewed in the lamination direction is 100 mm 2 or more and 500 mm 2 or less, as described in [1] or [2]. optical laminate.

[4] The area when the pressure-sensitive adhesive layer is viewed from the lamination direction is equal to or less than the area when the first optical member is viewed from the lamination direction, and is greater than or equal to the area when the second optical member is viewed from the lamination direction, [ The optical laminate according to any one of 1] to [3].

[5] The optical laminate according to any one of [1] to [4], wherein the second optical member further includes a retardation layer.

[6] The optical laminate according to any one of [1] to [5], wherein the front plate contains a polyethylene terephthalate film.

[7] The optical laminate according to any one of [1] to [6], wherein the first optical member constitutes an outermost surface of the display device when the optical laminate is used for a display device.

[8] The optical laminate according to any one of [1] to [7], wherein the second optical member is in contact with an image display element when the optical laminate is used for a display device.

[9] A display device comprising the optical laminate according to any one of [1] to [8].

[10] The display device according to [9], wherein the first optical member is bent with the first optical member outward, and the bending axis is movable.

ADVANTAGE OF THE INVENTION According to this invention, when it bend|folds, the optical laminated body by which peeling in an adhesive layer was suppressed, and the display apparatus containing this are provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows typically an example of the optical laminated body which concerns on this invention.
2 is a schematic cross-sectional view schematically showing an example of a display device according to the present invention.
3 is a schematic cross-sectional view schematically showing an example of a display device according to the present invention.
4 is a schematic cross-sectional view schematically showing an example of a display device according to the present invention.
5 is a schematic cross-sectional view schematically showing an example of a display device according to the present invention.
6 is a schematic cross-sectional view schematically illustrating an example of a display device according to the present invention.
7 is a schematic cross-sectional view schematically showing an example of a display device according to the present invention.
8 is a schematic cross-sectional view schematically illustrating an example of a display device according to the present invention.
It is a schematic sectional drawing which shows typically the optical laminated body produced in the Example.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of the optical laminated body which concerns on this invention is described referring drawings, this invention is not limited to the following embodiment. In all the drawings below, the scales are appropriately adjusted for easy understanding of each component, and the scale of each component shown in the drawings does not necessarily coincide with the scale of the actual component.

<Optical laminate>

The optical laminated body of this invention is demonstrated, referring FIG. The optical laminated body 100 which concerns on this invention is equipped with the 1st optical member 10, the adhesive layer 31, and the 2nd optical member 20 in this order. The optical laminated body 100 may be equipped with the other optical members 50 and 60 other than the 1st optical member 10 and the 2nd optical member 20. The first optical member 10 includes a front plate 11 and a colored layer 12 . The 2nd optical member 20 contains the polarizer 21, and may also contain the retardation layer 23 and the bonding layer 25 further. Hereinafter, in all the figures, the part corresponding to the 1st optical member 10 and the 2nd optical member 20 is surrounded by a thick frame.

The area when the 1st optical member 10 is seen from the lamination direction is larger than the area when the 2nd optical member is seen from the lamination direction. In the optical laminate 100 , the ratio of the area when the second optical member 20 is viewed from the lamination direction to the area when the first optical member 10 is viewed from the lamination direction is preferably 98.0 % or more and 99.9% or less, and may be 98.5% or more, 99.0% or more, or 99.5% or more. The difference between the area when the first optical member 10 is viewed from the lamination direction and the area when the second optical member 20 is viewed from the lamination direction is preferably 100 mm 2 or more and 500 mm 2 or less, and 100 mm 2 or more and 300 mm2 or less may be sufficient. In this specification, the area when the optical member is seen from the lamination direction is the maximum value of the area when the optical member is planarly viewed. Hereinafter, the area when an optical member is seen from a lamination|stacking direction is also simply called "area" of an optical member.

When the optical laminated body 100 is bent, the repulsive force which bends the edge part of an optical laminated body to the opposite side to a bending direction will arise. When this repulsive force is large, when the optical laminate 100 is put into the display device 200 to suppress the warpage of the end, the adhesive layer 31 included in the optical laminate 100 causes cohesive failure, or the adhesive layer An interface breakage may be caused between the adhesive layer and the adherend member, and peeling may occur in the pressure-sensitive adhesive layer or between the pressure-sensitive adhesive layer and the adherend member. In particular, when the end of the optical laminate 100 is further bent in the opposite direction to the bending, that is, when the optical laminate 100 is bent with the same side inside in two or more places, peeling from the pressure-sensitive adhesive layer occurs more easier to do When the bending axis of the optical laminated body 100 is movable, the peeling which arose at the edge part of the optical laminated body 100 tends to propagate to the inside of the optical laminated body 100 .

By making the area of the 1st optical member 10 larger than the area of the 2nd optical member 20, the optical laminated body 100 which concerns on this invention can suppress peeling in the adhesive layer at the time of a bending|flexion. Although the reason this inhibitory effect is acquired is not certain, it is estimated as follows. That is, it is thought that peeling between a 1st optical member and a 2nd optical member originates in the stress which arises in the edge part at the time of bending|flexion of an optical laminated body. In addition, it is estimated that the stress which arises in the edge part at the time of bending|flexion of an optical laminated body is large, so that the sum total of the adhesive force between each layer is large. In addition, when the first optical member is bent in the outside state, when the area of the first optical member is larger than the area of the second optical member, the stress generated in the end portion is particularly small, so that the first optical member and the second optical member It is thought that peeling is hard to produce between 2 optical members. This suppression effect is more remarkable when the edge part of the optical laminated body 100 is being fixed in a display apparatus. The optical laminated body 100 which concerns on this invention can suppress generation|occurrence|production of peeling in an adhesive layer especially even if it makes the 1st optical member 10 outward and repeatedly bends the optical laminated body 100 especially. Even if the optical laminated body 100 which concerns on this invention turns the 1st optical member 10 side outward and bends, and slides so that a bending axis|shaft may move, it is hard to produce peeling in an adhesive layer.

When the optical laminated body 100 is seen from the cross section of the lamination|stacking direction, it is preferable that the edge part of the 2nd optical member 20 is located inside rather than the edge part of the 1st optical member 10. As shown in FIG. When the optical laminated body 100 is seen from the cross section of the lamination|stacking direction, a part of the edge part of the 2nd optical member 20 may correspond with the edge part of the 1st optical member 10. As shown in FIG. The edge part of the 2nd optical member 20 may be located inside the edge part of the 1st optical member 10 100 micrometers or more, and may be located 500 micrometers or more inside.

2 to 4 , the optical laminate 100 and the display device 200 according to the present invention are illustrated. The optical laminated body 100 shown in FIG. 2 is the 1st optical member 10, the other optical member 50, the adhesive layer 31, the other optical member 60, and the 2nd optical member 20 ) in this order. The optical laminated body 100 shown in FIG. 3 is the 1st optical member 10, the other optical member 50, the adhesive layer 31, the other optical member 60, the adhesive layer 32, , the other optical member 70 and the second optical member 20 are included in this order. The optical laminated body 100 shown in FIG. 4 has the 1st optical member 10, the other optical member 50, the adhesive layer 31, the other optical member 60, the adhesive layer 32, , another optical member 70 , the pressure-sensitive adhesive layer 33 , another optical member 80 , and the second optical member 20 in this order. In the optical laminated body 100 shown in FIGS. 2-4, the 1st optical member 10 contains the front plate 11 and the coloring layer 12, The 2nd optical member 20 is a polarizer ( 21), the retardation layer 23 and the bonding layer 25 are included. The optical laminated body 100 is laminated|stacked on the image display element 40 via the bonding layer 25, and comprises the display apparatus 200. As shown in FIG.

The area of the image display element 40 may be the same as the area of the 2nd optical member 20, may be different, and may be larger than the area of the 2nd optical member 20. The area of the other optical members 50 , 60 , and 70 may be the same as or different from the area of the first optical member 10 or the area of the second optical member 20 , respectively, and the area of the first optical member 10 . Below, more than the area of the 2nd optical member 20 may be sufficient.

The area of the pressure-sensitive adhesive layer 31 may be the same as or different from the area of the first optical member 10 or the area of the second optical member 20, but is preferably less than or equal to the area of the first optical member 10, Moreover, it is more than the area of the 2nd optical member 20. At this time, peeling in the adhesive layer when the optical laminated body 100 is bent is more easily suppressed.

When a plurality of pressure-sensitive adhesive layers exist between the first optical member 10 and the second optical member 20 , the area of at least one pressure-sensitive adhesive layer is equal to or less than the area of the first optical member 10 , and the second optical member It is preferable that it is more than the area of (20). The area of all the adhesive layers may be less than the area of the 1st optical member 10, and more than the area of the 2nd optical member 20 may be sufficient. The example of the optical laminated body 100 which has the some adhesive layer 31 and 32 between the 1st optical member 10 and the 2nd optical member 20 is shown in FIGS. 5-8. In the optical laminate 100 shown in FIG. 5 , the pressure-sensitive adhesive layer 31 is equal to the area of the first optical member 10 , and the pressure-sensitive adhesive layer 32 is larger than the area of the first optical member 10 . It is small and larger than the area of the second optical member 10 . In the optical laminated body 100 shown in FIG. 6, the adhesive layer 31 is smaller than the area of the 1st optical member 10, and is larger than the area of the 2nd optical member 10, The adhesive layer 32 is , equal to the area of the first optical member 10 . In the optical laminated body 100 shown in FIG. 7, the adhesive layer 31 and the adhesive layer 32 are both smaller than the area of the 1st optical member 10, and larger than the area of the 2nd optical member 10. , the area of the pressure-sensitive adhesive layer 31 is larger than the area of the pressure-sensitive adhesive layer 32 . In the optical laminated body 100 shown in FIG. 8, the adhesive layer 31 and the adhesive layer 32 are both smaller than the area of the 1st optical member 10, and larger than the area of the 2nd optical member 10. , the area of the pressure-sensitive adhesive layer 31 is smaller than the area of the pressure-sensitive adhesive layer 32 .

In the present specification, the bending includes a bending form in which a curved surface is formed in the bending portion. In the bending form, the bending radius of the bent inner surface is not particularly limited. Further, the bending includes a refraction form in which the refraction angle of the inner surface is greater than 0° and less than 180°, and a folding form in which the bending radius of the inner surface is close to zero or the refraction angle of the inner surface is 0°.

The optical laminate 100 may have a rectangular shape, for example, in a plan view, preferably a rectangular shape having a long side and a short side, and more preferably a rectangle. When the shape in the plan view of the optical laminated body 100 is a rectangle, the length of the long side may be 10 mm or more and 1400 mm or less, for example, Preferably they are 50 mm or more and 600 mm or less. The length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less. As for each layer which comprises the optical laminated body 100, each part may be R-processed, an edge part may be notch-processed, or punching process may be carried out. In the present specification, planar view means viewing in the thickness direction of the layer.

The thickness of the optical laminate 100 is not particularly limited because it varies depending on the functions required for the optical laminate, the use of the optical laminate, etc., but is, for example, 20 µm or more and 500 µm or less, preferably 50 µm or more and 300 µm or more. It is micrometer or less, More preferably, they are 70 micrometers or more and 200 micrometers or less.

The optical laminate 100 can be used, for example, in a display device or the like. The display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescence display device. The optical laminated body 100 in which peeling from an adhesive layer does not arise even if it bends is suitable for a flexible display (a slide-type screen expansion display is included).

(first optical member)

The first optical member 10 includes a front plate 11 and a colored layer 12 . The 1st optical member 10 can comprise the outermost surface of the optical laminated body 100 . The first optical member 10 may be a layer from the colored layer 12 to the outermost surface of the optical laminate 100 , or another optical member from the colored layer 12 to the outermost surface of the optical laminate 100 . may include The first optical member 10 can constitute the outermost surface of the display device 200 when the optical laminate 100 is used for the display device 200 . The first optical member 10 may be a viewing side when the optical laminate 100 is used for a display device.

The thickness of the 1st optical member 10 is 30 micrometers or more and 300 micrometers or less, for example, Preferably they are 25 micrometers or more and 200 micrometers or less, More preferably, they are 30 micrometers or more and 150 micrometers or less, 150 micrometers or less, 100 Micrometer or less, 90 micrometer or less, or 75 micrometer or less may be sufficient. When the thickness of the 1st optical member 10 is too small, the function which protects the surface of the optical laminated body 100 may become inadequate. When the thickness of the 1st optical member 10 is too large, the bending|flexion of the optical laminated body 100 may become difficult.

(front panel)

The front plate is not limited in material and thickness as long as it is a plate-like body capable of transmitting light, and may be composed of only one layer or may be composed of two or more layers. Examples of the front plate include a glass plate body (a glass plate, a glass film, etc.), a resin plate body (resin plate, a resin sheet, a resin film, etc.), and a laminate of a glass plate body and a resin plate body. The front plate may be a layer constituting the outermost layer on the viewer side of the display device.

The thickness of the front plate may be, for example, 20 µm or more and 200 µm or less, preferably 30 µm or more and 200 µm or less, and more preferably 40 µm or more and 100 µm or less. In this invention, the thickness of each layer can be measured according to the thickness measuring method demonstrated in the Example mentioned later.

As a resin film, if it is a resin film which can transmit light, it will not be limited. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly(meth)acrylic, Polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, poly and films formed of polymers such as methyl (meth)acrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymer|macromolecule can be used individually or in mixture of 2 or more types. From the viewpoint of having excellent flexibility, high strength and high transparency, the front plate preferably includes a polyethylene terephthalate film, a polyimide film, a polyamide film or a polyamideimide peel.

When a front plate is a resin film, the film which has a hard-coat layer in at least one surface of a resin film may be sufficient as a front plate. The hard-coat layer may be formed in one surface of a resin film, and may be formed in both surfaces. When the display device mentioned later is a display device of a touch panel system, since the surface of a front plate becomes a touch surface, the resin film which has a hard-coat layer is used preferably. By providing a hard-coat layer, it can be set as the resin film which improved hardness and scratch resistance. A hard-coat layer is a hardened layer of ultraviolet curable resin, for example. Examples of the ultraviolet curable resin include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard-coat layer may contain the additive in order to improve intensity|strength. The additive is not limited, and inorganic fine particles, organic fine particles, or a mixture thereof may be mentioned.

As the glass plate, tempered glass for a display is preferably used. The thickness of the glass plate may be, for example, 20 µm or more and 200 µm or less, and may be 20 µm or more and 100 µm or less. By using the glass plate, the front plate can have excellent mechanical strength and surface hardness.

The front plate may not only have a function of protecting the front surface of a display apparatus, but may have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, etc.

(colored layer)

The colored layer may have a shielding property in order to shield an electrode, a wiring, or the like, or to suppress light leakage from a display unit provided in a display device.

The shape and color of a colored layer are not limited, For example, it can select suitably according to the use and design of the display apparatus using an optical laminated body. The colored layer may be provided so that it may be arrange|positioned partially in the planar view of an optical laminated body, for example, may be provided so that it may be arrange|positioned at the periphery in the planar view of a laminated body.

A single layer structure may be sufficient as a colored layer, and a multilayer structure may be sufficient as it. When the colored layer has a multilayer structure, at least one of the two or more layers is a colorant-containing layer containing a colorant, and the remaining layers may or may not contain a colorant. As a color of a coloring agent, black, red, white, dark blue, silver, gold, etc. are illustrated.

The thickness of the colored layer may be, for example, 0.1 µm or more and 5 µm or less, preferably 0.5 µm or more and 4 µm or less, more preferably 1 µm or more and 3 µm or less, still more preferably 1 µm or more and 2 µm or less. is below. The thickness is the maximum thickness of the colored layer. When the thickness of the colored layer is too large and the colored layer is partially formed in the planar view of the optical laminate, there is a tendency for a step to easily occur on the surface of the laminate. On the other hand, when the thickness of a colored layer is too small, there exists a tendency for sufficient light-shielding property to become difficult to be obtained.

The optical density of the colored layer may be, for example, 1.2 or more, 1.5 or more, 1.8 or more, and 2.0 or more, preferably 2.5 or more, 3.0 or more, or 3.5 or more, more preferably 4 or more, and still more preferably 5 or more. More than that. Although the upper limit of the optical density of a colored layer is not specifically limited, For example, 10 or less may be sufficient and 7 or less may be sufficient. The optical density is measured as follows. A colored layer is formed on the glass substrate. This sample is set in an optical density meter (for example, product name manufactured by X-rite: 361T), the upper light source located on the colored layer side of the sample is turned on, and the colored layer of the sample is focused. After turning off the upper light source, the light source for measurement located on the base material side of a sample is turned on, and optical density is measured using the colored layer as a measurement area.

When the colored layer is formed in the peripheral portion of the optical laminate in plan view, the width of the colored layer can be, for example, 0.5 mm or more, 3 mm or more, 5 mm or more, and usually It is 80 mm or less, 60 mm or less may be sufficient, 50 mm or less may be sufficient, 30 mm or less may be sufficient, and 20 mm or less may be sufficient as it.

The colored layer can be formed by a printing method using ink or paint, a vapor deposition method using a powder of a metal pigment, a photolithography method using a composition for forming a colored layer, or the like. The photolithography method is preferable from a viewpoint of making the thickness of a colored layer small and raising an optical density.

When the colored layer is formed by photolithography, an active energy ray-curable resin composition for forming a colored layer is applied on a support, a coating film of the photosensitive resin composition is exposed, then developed, and then baked can be done As an exposure light source, a mercury vapor arc, a carbon arc, a Xe arc, etc. which emit light with a wavelength of 250 nm or more and 450 nm or less can be used. A glass plate etc. can be used as a support body. In order to facilitate peeling of the colored layer from the glass plate, a separation layer may be formed on the glass plate, and a colored layer may be formed on the separation layer.

The active energy ray-curable composition for forming a colored layer may contain, for example, a binder resin, a colorant, a solvent, and optional additives. When the composition for colored layer formation is an active energy ray hardening type, the composition for colored layer formation contains an active energy ray polymeric compound further. If necessary, a photoinitiator, a photosensitizer, or the like may be further contained.

Examples of the binder resin include chlorinated polyolefins (eg, chlorinated polyethylene, chlorinated polypropylene), polyester-based resins, urethane-based resins, (meth)acrylic-based resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose-based resins. have. Binder resin may be used independently and may use 2 or more types together. Binder resin may be thermally polymerizable resin, or photopolymerizable resin may be sufficient as it.

The colorant may be black in order to easily increase the shielding effect of the color layer. The composition for forming a colored layer preferably contains carbon black. Examples of the colorant other than carbon black include inorganic pigments such as titanium white, zinc oxide, iron black, bengala, chrome vermillion, ultramarine blue, cobalt blue, yellow wax, and titanium yellow; organic pigments or dyes such as phthalocyanine blue, indanthrone blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, and aniline black; metal pigments composed of flaky flakes such as aluminum and brass; and pearlescent pigments (pearl pigments) composed of flaky flakes such as titanium dioxide-coated mica and basic lead carbonate. It is preferable that 50 mass parts or more and 200 mass parts or less of a coloring agent are contained with respect to 100 mass parts of binder resins.

The colored layer may have a tapered portion so as to increase in thickness in the direction from the end of the colored layer toward the inside of the colored layer. When a colored layer has a taper part, when bonding an adhesive layer and a colored member together, there exists a tendency for it to become easy to suppress the bite of a bubble. When the colored layer is formed by the above-described photolithography method, it tends to be easy to provide a tapered portion in the end region of the colored layer.

The colored layer may constitute a colored member further including at least one of a separation layer and a protective layer. When the colored member includes a separation layer and a protective layer, for example, the protective layer, the colored layer, and the separation layer may be included in this order, and the colored layer, the protective layer, and the separation layer may be included in this order. When the colored member includes a separation layer and a protective layer, the colored layer may be laminated on the viewing side rather than the separation layer, and the separation layer may be laminated on the viewing side rather than the colored layer. The coloring member is preferably laminated so as to be a separation layer, a colored layer, or a protective layer from the viewing side, or laminated so as to become a protective layer, a colored layer, or a separation layer, or laminated so as to become a colored layer, a protective layer, and a separation layer. The first optical member 10 may further include, in addition to the colored layer, at least one of a separation layer and a protective layer positioned on the viewing side rather than the colored layer. The separation layer and the protective layer positioned on the image display element side rather than the colored layer do not need to be included in the first optical member 10 .

The thickness of the coloring member may be, for example, 0.1 µm or more and 10 µm or less, preferably 1 µm or more and 7 µm or less, and more preferably 1 µm or more and 6 µm or less.

(separation layer)

A separation layer has a function for making it easy to isolate|separate the support body used in the manufacturing process of a colored layer, and a colored layer. The separation layer may be, for example, an inorganic material layer or an organic material layer. The separation layer can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. As a material for forming the inorganic substance layer, for example, silicon oxide is exemplified. As a material which forms an organic substance layer, a (meth)acrylic-type resin composition, an epoxy-type resin composition, a polyimide-type resin composition, etc. are mentioned, for example. The colored layer and separation layer isolate|separated from a support body can transcribe the separation layer side to another optical member through a bonding layer. The thickness of the separation layer may be, for example, 0.01 µm or more and 1 µm or less, and preferably 0.05 µm or more and 0.5 µm or less. A separation layer may consist of two or more layers.

(protective layer)

The protective layer protects the colored layer and has a function of flattening the level difference caused by the colored layer. The protective layer may be an organic layer or an inorganic layer. As materials for the inorganic layer and the organic layer, the same materials as those shown in the description of the separation layer can be used. These layers can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. The thickness of the protective layer may be, for example, 0.1 µm or more and 10 µm or less, and preferably 0.5 µm or more and 5 µm or less.

(Protection film)

The first optical member 10 may further include a protection film. A protection film has a function to protect surfaces, such as the optical laminated body 100, and can be a laminated body of a resin film and an adhesive layer normally. A thermoplastic resin may be sufficient as resin which comprises a resin film. A protection film is peeled and removed for every adhesive layer, after the optical laminated body provided with a protection film is bonded to an image display element, for example. A resin film, For example, Polyolefin resins, such as a polyethylene-type resin, a polypropylene-type resin, and a cyclic polyolefin-type resin; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate-based resin; It can be comprised with (meth)acrylic-type resin etc. (meth)acryl represents at least 1 sort(s) chosen from the group which consists of acryl and methacryl. The same applies to other terms to which "(meta)" is assigned.

The thickness of the protection film may be, for example, 5 µm or more and 200 µm or less, preferably 10 µm or more and 180 µm or less, more preferably 20 µm or more and 150 µm or less, and still more preferably 30 µm or more and 120 µm or less. is below. When thickness is less than 5 micrometers, protection of an optical laminated body may become inadequate, and it is disadvantageous also from the point of handleability. It is disadvantageous in terms of cost or the rework property of a protection film that thickness exceeds 200 micrometers.

(second optical member)

The second optical member 20 includes a polarizer 21 . The 2nd optical member 20 can comprise the outermost surface of the 1st optical member 10 of the optical laminated body 100 and the opposite side. The second optical member 20 can contact the image display element 40 when the optical laminate 100 is used for the display device 200 . The second optical member 20 may be from the polarizer 21 to the layer in contact with the image display element 40 , and may include other optical members from the polarizer 21 to the layer in contact with the image display element 40 . .

The thickness of the 2nd optical member 20 is 30 micrometers or more and 300 micrometers or less, for example, Preferably they are 25 micrometers or more and 200 micrometers or less, More preferably, they are 30 micrometers or more and 150 micrometers or less, 150 micrometers or less, 100 Micrometer or less, 90 micrometer or less, or 75 micrometer or less may be sufficient.

It is preferable that the thickness of the 2nd optical member 20 is smaller than the thickness of the 1st optical member 10. By setting it as such a relationship, it becomes easy to also prevent generation|occurrence|production of the crack which may arise when an optical laminated body is bent.

(polarizer)

The polarizer may be a linear polarizer. The polarizer includes a stretched film or stretched layer to which a dichroic dye is adsorbed, or a cured product of a polymerizable liquid crystal compound and a dichroic dye, and a liquid crystal in which the dichroic dye is dispersed and oriented in the cured product of the polymerizable liquid crystal compound layers, and the like. The polarizer which is a liquid crystal layer is preferable since there is no restriction|limiting in a bending direction compared with the stretched film or stretched layer which made the dichroic dye adsorb|suck.

(1) Polarizer as a stretched film or stretched layer

A polarizer, which is a stretched film to which a dichroic dye is adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, and dyeing a polyvinyl alcohol-based resin film with a dichroic dye such as iodine, thereby adsorbing the dichroic dye. It can manufacture through a process, the process of treating the polyvinyl alcohol-type resin film to which the dichroic dye has adsorbed with the aqueous boric acid solution, and the process of washing with water after the process with the aqueous boric acid solution.

The thickness of a polarizer is 30 micrometers or less normally, Preferably it is 18 micrometers or less, More preferably, it is 15 micrometers or less. Making the thickness of the polarizer thin is advantageous for thinning the optical laminate 100 . The thickness of a polarizer may be 1 micrometer or more normally, for example, 5 micrometers or more may be sufficient.

Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate-type resin. As polyvinyl acetate-type resin, the copolymer of vinyl acetate and other monomer copolymerizable to it other than polyvinyl acetate which is a homopolymer of vinyl acetate is used. As another monomer copolymerizable with vinyl acetate, an unsaturated carboxylic acid type compound, an olefin type compound, a vinyl ether type compound, an unsaturated sulfone type compound, and the (meth)acrylamide type compound which has an ammonium group are mentioned, for example.

The saponification degree of polyvinyl alcohol-type resin is 85 mol% or more and 100 mol% or less normally, Preferably they are 98 mol% or more. The polyvinyl alcohol-type resin may be modified|denatured, for example, polyvinyl formal and polyvinyl acetal modified|denatured with aldehydes can also be used. The polymerization degree of polyvinyl alcohol-type resin is 1000 or more and 10000 or less normally, Preferably they are 1500 or more and 5000 or less.

The polarizer as the stretched layer to which the dichroic dye is adsorbed is usually a process of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a process of uniaxially stretching the obtained laminated film, poly of the uniaxially stretched laminated film By dyeing the vinyl alcohol-based resin layer with a dichroic dye, the dichroic dye is adsorbed to form a polarizer; the film to which the dichroic dye is adsorbed is treated with an aqueous boric acid solution; It can be manufactured through You may use the base film used in order to form a polarizer as a protective film of a polarizer. You may peel and remove a base film from a polarizer as needed. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film mentioned later.

The polarizer which is a stretched film or a stretched layer may be knitted into the optical laminated body in the form by which the thermoplastic resin film is pasted by the single side|surface or both surfaces. This thermoplastic resin film can function as a protective film for polarizers or retardation film. A thermoplastic resin film, For example, Polyolefin resins, such as chain|strand polyolefin resin (polypropylene resin etc.) and cyclic polyolefin resin (norbornene type resin etc.); Cellulose resins, such as a triacetyl cellulose; polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate-based resin; (meth)acrylic resin; Alternatively, it may be a film made of a mixture thereof or the like. A thermoplastic resin film can be bonded together to a polarizer using the bonding layer mentioned later, for example. The protective film (thermoplastic resin film) of the polarizer located on the visual recognition side rather than the polarizer does not need to be contained in a 2nd optical member.

The thickness of a thermoplastic resin film is 100 micrometers or less normally from a viewpoint of thinning, Preferably it is 80 micrometers or less, More preferably, it is 60 micrometers or less, It is 5 micrometers or more normally, Preferably it is 10 micrometers or more.

The hard-coat layer may be formed on the thermoplastic resin film. The hard-coat layer may be formed in one surface of a thermoplastic resin film, and may be formed in both surfaces. By providing a hard-coat layer, it can be set as the thermoplastic resin film which improved hardness and scratch resistance. A hard-coat layer can be carried out similarly to the hard-coat layer formed in the resin film mentioned above, and can be formed.

(2) a polarizer as a liquid crystal layer

The polymerizable liquid crystal compound used to form the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. A polymerizable reactive group is a group which participates in a polymerization reaction, and it is preferable that it is a photopolymerizable reactive group. The photopolymerization reactive group refers to a group capable of participating in a polymerization reaction by an active radical or an acid generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. . Among these, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group and oxetanyl group are preferable, and acryloyloxy group is more preferable. The kind of polymerizable liquid crystal compound is not specifically limited, A rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and these mixtures can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and a nematic liquid crystal or a smectic liquid crystal may be sufficient as a phase-ordered structure.

As a dichroic dye used for the polarizer which is a liquid crystal layer, it is preferable to have an absorption maximum wavelength (λMAX) in the range of 300-700 nm. As such a dichroic dye, although an acridine dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye, an anthraquinone dye, etc. are mentioned, for example, Especially, an azo dye is preferable. As an azo dye, a monoazo dye, a bisazo dye, a trisazo dye, a tetrakis azo dye, a stilbenazo dye, etc. are mentioned, Preferably they are a bisazo dye and a trisazo dye. Although a dichroic dye may be individual or may combine 2 or more types, it is preferable to combine 3 or more types. In particular, it is more preferable to combine three or more types of azo compounds. A part of the dichroic dye may have a reactive group, and may have liquid crystallinity.

The polarizer, which is a liquid crystal layer, can be formed, for example, by applying a composition for forming a polarizer including a polymerizable liquid crystal compound and a dichroic dye on an alignment film formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound. have. On a base film, you may form a polarizer by apply|coating the composition for polarizer formation, forming a coating film, and extending|stretching this coating film with a base film. You may use the base film used in order to form a polarizer as a protective film of a polarizer. The material and thickness of the base film may be the same as the material and thickness of the above-described thermoplastic resin film.

As a composition for forming a polarizer comprising a polymerizable liquid crystal compound and a dichroic dye, and a method for manufacturing a polarizer using the composition, Japanese Patent Application Laid-Open Nos. 2013-37353, 2013-33249, and Japanese Patent Application Laid-Open No. 2017 -83843 and the like can be exemplified. In addition to the polymerizable liquid crystal compound and the dichroic dye, the composition for polarizer formation may further contain additives, such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, antioxidant, a plasticizer, and a sensitizer. These components may use only 1 type, respectively, and may use them in combination of 2 or more type.

The polymerization initiator which the composition for polarizer formation may contain is a compound which can start the polymerization reaction of a polymeric liquid crystal compound, From the point which can start a polymerization reaction under more low-temperature conditions, a photoinitiator is preferable. Specifically, a photoinitiator capable of generating an active radical or an acid by the action of light is exemplified, and among these, a photoinitiator capable of generating a radical by the action of light is preferable. To [ content of a polymerization initiator / 100 weight part of total amounts of a polymeric liquid crystal compound ], Preferably they are 1 mass part or more and 10 mass parts or less, More preferably, they are 3 mass parts or more and 8 mass parts or less. If it exists in this range, reaction of a polymeric group will fully advance and it will be easy to stabilize the orientation state of a liquid crystal compound.

The thickness of the polarizer which is a liquid crystal layer is 10 micrometers or less normally, Preferably they are 0.5 micrometer or more and 8 micrometers or less, More preferably, they are 1 micrometer or more and 5 micrometers or less.

The polarizer which is a liquid crystal layer may be knitted together by the optical laminated body in the form by which the above-mentioned thermoplastic resin film is pasted on the single side|surface or both surfaces. This thermoplastic resin film can function as a protective film for polarizers or retardation film.

The polarizer which is a liquid crystal layer may have an overcoat layer on the single side|surface or both surfaces for the purpose of protection of a polarizer etc. The overcoat layer can be formed, for example, by applying a composition for forming an overcoat layer on the polarizer. The composition constituting the overcoat layer preferably contains, for example, a photocurable resin, a water-soluble polymer, or the like. It is preferable that the composition which comprises an overcoat layer contains a (meth)acrylic-type resin, polyvinyl alcohol-type resin, etc.

(retardation layer)

The polarizer may further include a retardation layer to constitute a circularly polarizing plate (including an elliptically polarizing plate). A circular polarizing plate arranged so that the absorption axis of the linear polarizer and the slow axis of the retardation layer are at a predetermined angle can exhibit an antireflection function. The 2nd optical member 20 may further contain the phase difference layer 23 located in the image display element side rather than a polarizer.

The number of retardation layers may be one, or two or more layers may be sufficient as them. The retardation layer may have an overcoat layer which protects the surface, the base film etc. which support the retardation layer. The retardation layer may include a λ/4 layer, and may include at least either a λ/2 layer or a positive C layer. When the retardation layer contains the λ/2 layer, the λ/2 layer and the λ/4 layer are laminated in order from the linear polarizer side. When the retardation layer contains the positive C layer, the λ/4 layer and the positive C layer may be sequentially laminated from the linear polarizer side, or the positive C layer and the λ/4 layer may be laminated sequentially from the linear polarizer side. The thickness of the retardation layer is, for example, 0.1 µm or more and 10 µm or less, preferably 0.5 µm or more and 8 µm or less, and more preferably 1 µm or more and 6 µm or less.

The retardation layer may be formed from the above-described thermoplastic resin film, or may be formed from a layer in which a polymerizable liquid crystal compound is cured. The retardation layer may further include an alignment film. The retardation layer may have a bonding layer for bonding the λ/4 layer, the λ/2 layer, and the positive C layer.

When the retardation layer is formed by curing the polymerizable liquid crystal compound, the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing it. You may form an orientation film between a base film and an application layer. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film. When forming a retardation layer with the layer formed by hardening|curing a polymeric liquid crystal compound, the retardation layer may be knitted together in the optical laminated body in the form which has an orientation film and a base film. A retardation layer can be bonded together to the surface on the opposite side to the visual recognition side of a linear polarizer via the bonding layer mentioned later.

(touch sensor panel)

The second optical member 20 may further include a touch sensor panel. As the touch sensor panel, a detection method is not limited as long as it is a sensor capable of detecting a touched position, and a touch sensor panel such as a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic method, an electromagnetic inductive coupling method, or a surface acoustic wave method This is exemplified. Since it is low cost, the touch sensor panel of a resistive film type or a capacitive coupling type is used preferably.

An example of a resistive touch sensor panel includes a pair of substrates disposed opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent conductive film provided as a resistive film on the entire inner surface of each substrate; It is constituted by a touch position detection circuit. In a display device provided with a resistive touch sensor panel, when the surface of the front plate is touched, the opposing resistive films are short-circuited, and a current flows through the resistive film. The touch position detection circuit detects a change in voltage at this time, and the touched position is detected.

An example of the touch sensor panel of the capacitive coupling method is comprised by the board|substrate, the transparent electrode for position detection provided on the front surface of the board|substrate, and a touch position detection circuit. In a display device provided with a capacitive coupling type touch sensor panel, when the surface of the front plate is touched, the transparent electrode is grounded through the human body's capacitance at the touched point. The touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.

(Adhesive layer)

The pressure-sensitive adhesive layer is laminated between the first optical member 10 and the second optical member 20 . The adhesive layer may be the layer which bonds the 1st optical member 10 and the 2nd optical member 20 together, and the 1st optical member 10 and another optical member, another optical member and the 2nd optical member 20, Or the layer which bonds other optical members together may be sufficient. Although the adhesive layer may consist of two or more layers, Preferably it is one layer.

The pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing (meth)acrylic resin, rubber-based resin, urethane-based resin, ester-based resin, silicone-based resin, and polyvinyl ether-based resin as a main component (base polymer). Especially, the adhesive composition which uses as a base polymer (meth)acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. is preferable. An active energy ray hardening type or a thermosetting type may be sufficient as an adhesive composition.

As the (meth)acrylic resin used in the pressure-sensitive adhesive composition, (meth)acrylic acid ester, such as (meth)butyl acrylate, (meth)ethyl acrylate, (meth)acrylate isooctyl, (meth)acrylic acid 2-ethylhexyl, or The polymer or copolymer which uses 2 or more types as a monomer is used preferably. It is preferable to copolymerize a polar monomer with a base polymer. As the polar monomer, (meth)acrylic acid compound, (meth)acrylic acid 2-hydroxypropyl compound, (meth)acrylic acid hydroxyethyl compound, (meth)acrylamide compound, N,N-dimethylaminoethyl (meth)acrylate compound and monomers having a carboxy group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as a glycidyl (meth)acrylate compound.

It is preferable that the weight average molecular weights (Mw) of (meth)acrylic-type resin are 600,000 or more and 1.5 million or less, for example. If the weight average molecular weight (Mw) is within such a range, the durability and surface tension of the pressure-sensitive adhesive layer are improved, and the adhesive force is easily maintained. A weight average molecular weight (Mw) can be measured according to the measuring method demonstrated in the column of the Example mentioned later.

Although the adhesive composition may contain only the said base polymer, normally, it further contains a crosslinking agent. Examples of the crosslinking agent include a metal ion having a divalent or higher valence, a metal ion forming a carboxylate metal salt with a carboxyl group, a polyamine compound forming an amide bond with a carboxyl group, a polyepoxy compound forming an ester bond with a carboxyl group, or A polyisocyanate compound which forms an amide bond between a polyol and a carboxy group is illustrated. The crosslinking agent is preferably a polyisocyanate compound.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays or electron beams, has adhesiveness even before active energy ray irradiation, and can adhere to an adherend such as a film, and can be irradiated with active energy rays It has the property of being able to adjust the adhesion by being cured by It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curable type. The pressure-sensitive adhesive composition may further contain an active energy ray polymerizable compound in addition to the base polymer and the crosslinking agent. You may contain a photoinitiator, a photosensitizer, etc. as needed.

As an active energy ray polymeric compound, For example, the (meth)acrylate monomer which has at least 1 piece(s) acryloyloxy group in a molecule|numerator; (meth)acrylic compounds such as (meth)acryloyloxy group-containing compounds such as (meth)acrylate oligomers obtained by reacting two or more functional group-containing compounds and having at least two (meth)acryloyloxy groups in the molecule can be heard The pressure-sensitive adhesive composition may contain 0.1 parts by mass or more of the active energy ray polymerizable compound with respect to 100 parts by mass of the solid content of the pressure-sensitive adhesive composition, and may contain 10 parts by mass or less, 5 parts by mass or less, or 2 parts by mass or less.

As a photoinitiator, benzophenone, benzyl dimethyl ketal, 1-hydroxycyclohexyl ketone etc. are mentioned, for example. A photoinitiator may contain 1 type or 2 or more types. When an adhesive composition contains a photoinitiator, 0.01 mass part or more and 3.0 mass parts or less may be sufficient as the total content with respect to 100 mass parts of solid content of an adhesive composition, for example.

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders and other inorganic powders, etc.), antioxidants, ultraviolet rays It may contain additives such as absorbents, dyes, pigments, colorants, defoamers, corrosion inhibitors, and photopolymerization initiators.

An adhesive layer can be formed by apply|coating the organic solvent dilution liquid of the said adhesive composition on a base material, and drying it. An adhesive layer can also be formed using the adhesive sheet formed using the adhesive composition. When an active energy ray hardening-type adhesive composition is used, it can be set as the adhesive layer which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

Although the thickness of an adhesive layer is not specifically limited, For example, it is preferable that they are 1 micrometer or more and 100 micrometers or less, It is more preferable that they are 3 micrometers or more and 50 micrometers or less, 20 micrometers or more may be sufficient.

Optical laminate WHEREIN: It is preferable that the thickness of the adhesive layer arrange|positioned most at the 1st optical member side is more than the thickness of the adhesive layer arrange|positioned most at the image display element 40 side. Thus, by setting the thickness of an adhesive layer, it becomes easy to prevent generation|occurrence|production of the crack which may arise when an optical laminated body is bent. For example, in the optical laminated body 100 shown in FIG. 3, when the bonding layer 25 is an adhesive layer, it is preferable that the thickness of the adhesive layer 31 is more than the thickness of the bonding layer 25, FIG. 4 In the optical laminated body 100 shown to WHEREIN: It is preferable that the thickness of the adhesive layer 31 is more than the thickness of the bonding layer 25.

(Other optical members)

The optical laminate 100 may include other optical members. The optical member constituting the optical laminate 100 may be a component used in a normal display device. As another optical member, an impact-resistant film, a protective film, a protective layer, a base film, a bonding layer, etc. are mentioned, for example.

(impact resistant film)

An impact-resistant film is a film for protecting a colored layer, a polarizing plate, etc. from the impact from the outside. The impact-resistant film may include a thermoplastic resin, for example, a polyolefin-based resin such as a polyethylene-based resin, a polypropylene-based resin, or a cyclic polyolefin-based resin; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate-based resin; It can be comprised with (meth)acrylic-type resin etc. An impact-resistant film may be comprised by a single layer, and may be comprised by multilayer. The impact-resistant film may be the same as the resin film used for the front plate.

The thickness of the impact resistant film may be, for example, 5 µm or more and 100 µm or less, preferably 10 µm or more and 90 µm or less, and more preferably 20 µm or more and 80 µm or less. When thickness is less than 5 micrometers, protection of a colored layer and a polarizer may become inadequate, and it is disadvantageous also from the point of handleability. It is preferable to make thickness into 100 micrometers or less from a viewpoint of improving a flexibility.

(bonding layer)

The optical laminated body 100 can contain the bonding layer for bonding two layers together. A bonding layer is a layer comprised from an adhesive or an adhesive agent. In this specification, when a bonding layer is a layer comprised from an adhesive layer, the said bonding layer does not exist between a 1st optical member and a 2nd optical member.

When the bonding layer is a layer composed of an adhesive, the pressure-sensitive adhesive composition used as the material of the bonding layer can use the above-mentioned pressure-sensitive adhesive composition for pressure-sensitive adhesive layers, and other pressure-sensitive adhesives, for example, different from the material of the above-mentioned pressure-sensitive adhesive layer (meta) Acrylic adhesive, styrene adhesive, silicone adhesive, rubber adhesive, urethane adhesive, polyester adhesive, epoxy copolymer adhesive, etc. can also be used.

As an adhesive agent used as the material of a bonding layer, it can form, for example combining 1 type, or 2 or more types among a water-system adhesive agent, an active energy ray hardening-type adhesive agent, etc. Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution, a water-based two-part type urethane-based emulsion adhesive, and the like. The active energy ray-curable adhesive is an adhesive that is cured by irradiating active energy rays such as ultraviolet rays, for example, an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, a binder resin, and a photoreactive crosslinking agent and adhesives containing Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers and photocurable urethane monomers, and oligomers derived from these monomers. As said photoinitiator, the compound containing the substance which irradiates active energy rays, such as an ultraviolet-ray, generates active species, such as a neutral radical, an anion radical, and a cationic radical, is mentioned.

Although the thickness of a bonding layer is not specifically limited, When using the layer comprised with an adhesive as a bonding layer, it is preferable that it is 10 micrometers or more, 15 micrometers or more may be sufficient, 20 micrometers or more may be sufficient, and it is 200 micrometers or less normally, 100 micrometers or less It may be, and 50 micrometers or less may be sufficient as it. When using a bonding layer as a bonding layer, the thickness of the bonding layer is preferably 0.1 µm or more, may be 0.5 µm or more, preferably 10 µm or less, and may be 5 µm or less.

The two opposing surfaces bonded together through a bonding layer may perform corona treatment, a plasma treatment, a flame treatment, etc. beforehand, and may have a primer layer etc.

(Method for producing optical laminate)

The optical laminate 100 is a method including a step of bonding the layers constituting the optical laminate 100 through a pressure-sensitive adhesive layer or a bonding layer using an apparatus such as a known laminator, roll, or cell bonding machine. can be manufactured according to When bonding layers through an adhesive layer or a bonding layer, it is preferable to perform surface activation processing, such as a corona treatment, with respect to one or both of bonding surfaces for the purpose of adjusting adhesive force. The conditions of a corona treatment can be set suitably, and conditions may differ from one surface of a bonding surface and another surface.

<Display device>

The display device 200 according to the present invention includes the optical laminate 100 . The display apparatus 200 is not specifically limited, For example, image display apparatuses, such as an organic electroluminescent display device, an inorganic electroluminescent display device, a liquid crystal display device, and an electroluminescent display device, are mentioned. The display device may have a touch panel function. The optical laminate 100 is suitable for a display device having flexibility that can be bent or bent. In the display device, the optical laminate 100 is disposed on the viewing side of the display device with the first optical member 10 facing the outside (the side opposite to the image display element 40 side). The display device is bendable with the first optical member 10 outward. The display device is bendable with the first optical member 10 turned outward, and preferably the bending axis is movable.

The display device according to the present invention can be used as mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signs, measuring instruments and instruments, office equipment, medical equipment, computer equipment, and the like. Since the display device according to the present invention has excellent flexibility, it is suitable for a flexible display (including a slide-type screen expansion display) or the like.

(Example)

[thickness of layer]

It measured using the contact-type film thickness measuring apparatus ("MS-5C" by Nikon Corporation). However, the retardation layer and the alignment film were measured using a laser microscope (LEXT, manufactured by Olympus Corporation).

[Bending Test]

The presence or absence of peeling at the time of bending the test laminated body containing an optical laminated body was measured. The test laminate was bent with a bending radius of 4R so that the front plate side turned outward, and was fixed for 10 days. Then, it was observed whether peeling had arisen between the layers in an optical laminated body.

<Example 1>

(front panel)

A film in which a hard coat layer having a thickness of 10 µm was formed on one side (visible side) of a 50 µm-thick polyethylene terephthalate film (manufactured by Toray Industries, Inc.) was used. The hard-coat layer was a layer formed from the composition containing the dendrimer compound which has a polyfunctional acryl group at the terminal.

(no coloring)

A composition for forming an active energy ray-curable colored layer containing carbon black (“CR-BK0951L” manufactured by Samsung SDI) was prepared. An acrylic resin was coated on a glass plate (support) to form a separation layer (thickness: 3.0 µm). On the separation layer, the colored layer was patterned by a photolithography method to have a thickness of 1.4 µm after drying using the above-mentioned composition for forming a colored layer, and the colored layer was partially formed. Next, on the surface on the side of the formed colored layer, the composition of Example 1 in Japanese Patent Application Laid-Open No. 2016-014877 was coated to form a protective layer (thickness: 2.0 µm). In this way, a colored member having a layer structure of a separation layer/colored layer/protective layer was formed on the support. At the time of preparation of an optical laminated body, the support body was peeled. The photolithography method includes a process for applying a composition for forming a colored layer, an exposure process, a developing process, and a thermosetting process.

(impact resistant film)

A 40-micrometer-thick polyamideimide film was prepared as an impact-resistant film.

(Circular Polarizer)

A photo-alignment film was formed on a triacetyl cellulose (TAC) film (KC2UA, manufactured by KONICA MINOLTA, Inc., thickness of 25 µm). A composition containing a dichroic dye and a polymerizable liquid crystal compound was applied on a photo-alignment film, oriented and cured to obtain a polarizer layer having a thickness of 2.0 µm. On this polarizer layer, 3 parts of a composition for forming an overcoat layer (water 100 parts, polyvinyl alcohol resin powder (KL318, manufactured by KURARAY CO., LTD, average degree of polymerization 18000)), polyamide epoxy resin as a crosslinking agent (SR650 (30), (product of Sumika Chemtex Company, Limited) mixed with 1.5 parts) was applied by a bar coating method, and dried at a temperature of 80° C. for 3 minutes to form an overcoat layer. The thickness of the overcoat layer was 1.0 μm. Thus, a linear polarizing plate having a layer structure of TAC film/photo-alignment film/polarizer layer/overcoat layer was obtained.

As for the retardation layer, the λ/4 layer, the bonding layer, the positive C layer, and the base film were laminated in this order, and the thickness excluding the base film was 7 µm. This bonding layer consisted of an adhesive bond layer, and thickness was 2 micrometers. The λ/4 layer had a layer in which the liquid crystal compound was cured and an alignment film, and had a thickness of 2 µm. The positive C layer had a layer in which the liquid crystal compound was cured and an alignment film, and had a thickness of 3 µm. As the base film, a polyethylene terephthalate film having a thickness of 100 µm was used.

The overcoat layer side of the linear polarizing plate and the λ/4 layer side of the retardation layer were bonded through a bonding layer to obtain a circularly polarizing plate. This bonding layer consisted of an adhesive, and thickness was 25 micrometers. The angle between the absorption axis of the linear polarizer layer and the slow axis of the retardation layer was 45°.

(Production of optical laminate)

The optical laminated body which has the structure of front plate / adhesive layer / coloring member (separation layer / colored layer / protective layer) / adhesive layer / impact-resistant film / adhesive layer / circularly polarizing plate / bonding layer was produced. The adhesive layer was a layer made of a UV curable adhesive, and had a thickness of 1.5 µm. The bonding layer and the adhesive layer were an acrylic adhesive layer, and thickness was 25 micrometers. This optical laminate was bonded to a plastic plate instead of the image display element 40 to obtain a test laminate.

The obtained optical laminated body 100 is shown in FIG. The optical laminate 100 includes a first optical member 10 , another optical member 50 , an adhesive layer 31 , another optical member 60 , an adhesive layer 32 , and another optical member. 70 and the second optical member 20 are included in this order. The 1st optical member 10 contains the front plate 11, the bonding layer 121, the separation layer 122, and the colored layer 12 in this order. The second optical member 20 includes a polarizer 21 , an overcoat layer 211 , a bonding layer 22 , an alignment film 231 , a first retardation layer 23 , a bonding layer 232 , and , the second retardation layer 24 , the alignment film 241 , and the bonding layer 25 are included in this order. The other optical member 50 is a protective layer of the coloring member. The other optical member 60 is an impact resistant film. The other optical member 70 includes a protective film 71 of the polarizer and an alignment film 711 . The thickness of the 1st optical member 10 was 65.9 micrometers, and the thickness of the 2nd optical member was 60 micrometers.

In the optical laminate 100 of Example 1, the area of the 1st optical member 10, the area of the 2nd optical member 20, and the area of the plastic plate are shown in Table 1, respectively. In Example 1, the area of the 1st optical member 10 was larger than the area of the 2nd optical member 20. As shown in FIG. The area of the plastic plate was smaller than the area of the second optical member 20 . The area of the optical member between the 1st optical member 10 and the 2nd optical member 20 was equal to the area of the 1st optical member 10 . The area of the pressure-sensitive adhesive layer 31 was the same as the area of the first optical member 10 . The area of the pressure-sensitive adhesive layer 32 was 165.80 × 126.89 mm 2 , smaller than the area of the first optical member 10 , and larger than the area of the second optical member 20 .

<Example 2>

An optical laminate was produced in the same manner as in Example 1, except that the area of the first optical member 10, the second optical member 20, and the area of the plastic plate were set to the values shown in Table 1. In Example 2, the area of the 1st optical member 10 was larger than the area of the 2nd optical member 20. As shown in FIG. The area of the plastic plate was equal to the area of the second optical member 20 . The area of the pressure-sensitive adhesive layer 31 was the same as the area of the first optical member 10 . The area of the pressure-sensitive adhesive layer 32 was 165.80 × 126.89 mm 2 , smaller than the area of the first optical member 10 , and larger than the area of the second optical member 20 .

<Comparative Example 1>

An optical laminate was produced in the same manner as in Example 1, except that the area of the first optical member 10, the second optical member 20, and the area of the plastic plate were set to the values shown in Table 1. In the comparative example 1, the area of the 1st optical member 10 and the area of the 2nd optical member 20 were the same.

<Comparative Example 2>

Except having made the area of the 1st optical member 10, the 2nd optical member 20, and the area of a plastic plate into the value shown in Table 1, and having set the thickness of the 2nd optical member to 90 micrometers, An optical laminate was produced in the same manner as in Example 1. In the comparative example 2, the area of the 1st optical member 10 and the area of the 2nd optical member 20 were the same.

[Table 1]

About the optical laminated body of an Example and a comparative example, the result of having done the bending test is shown in Table 1. As for the optical laminated body of Example 1 and Example 2, peeling was not seen in an adhesive layer, but the floatation in an adhesive layer was also suppressed.

100: optical laminate 200: display device
10: first optical member 11: front plate
111: hard coating layer 12: colored layer
121: bonding layer 122: separation layer
20: second optical member 21: polarizer
211: overcoat layer 22, 232, 25: bonding layer
23, 24: retardation layer 231, 241: alignment layer
31, 32, 33: adhesive layer 40: image display element
50, 60, 70: another optical member 71: protective film
711: alignment layer

Claims (10)

A 1st optical member, an adhesive layer, and a 2nd optical member are provided in this order,
The first optical member includes a front plate and a colored layer,
The second optical member includes a polarizer,
The optical laminated body whose area when the said 1st optical member is seen from the lamination direction is larger than the area when the said 2nd optical member is seen from the lamination direction. According to claim 1,
The optical laminated body whose ratio of the area when the said 2nd optical member is seen from the lamination direction with respect to the area when the said 1st optical member is seen from the lamination direction is 98.0 % or more and 99.9 % or less. 3. The method of claim 1 or 2,
The difference between the area when the said 1st optical member is seen from the lamination direction, and the area when the said 2nd optical member is seen from the lamination direction is 100 mm<2> or more and 500 mm<2> The optical laminated body. 3. The method of claim 1 or 2,
An area when the pressure-sensitive adhesive layer is viewed from the lamination direction is equal to or less than the area when the first optical member is viewed from the lamination direction, and is larger than or equal to the area when the second optical member is viewed from the lamination direction. 3. The method of claim 1 or 2,
The second optical member further comprises a retardation layer, the optical laminate. 3. The method of claim 1 or 2,
The front plate comprises a polyethylene terephthalate film, an optical laminate. 3. The method of claim 1 or 2,
The said 1st optical member comprises the outermost surface of the said display apparatus, when the said optical laminated body is used for a display apparatus, The optical laminated body. 3. The method of claim 1 or 2,
The said 2nd optical member is an optical laminated body in contact with an image display element, when the said optical laminated body is used for a display apparatus. A display device comprising the optical laminate according to claim 1 or 2. 10. The method of claim 9,
The display device is bendable with the first optical member outward, and the bend axis is movable.

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