CN114127590A - Optical laminate and method for producing same - Google Patents
Optical laminate and method for producing same Download PDFInfo
- Publication number
- CN114127590A CN114127590A CN202080051283.6A CN202080051283A CN114127590A CN 114127590 A CN114127590 A CN 114127590A CN 202080051283 A CN202080051283 A CN 202080051283A CN 114127590 A CN114127590 A CN 114127590A
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- Prior art keywords
- layer
- optical laminate
- colored layer
- panel
- optical
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
The invention aims to provide an optical laminate which is provided with a coloring layer, inhibits air bubbles from mixing and inhibits height difference of a visual recognition side surface. The present invention provides an optical laminate comprising a front plate, a bonding layer, and a back plate in this order from a visual recognition side to a display side, and further comprising a colored layer provided on a part of a surface of the front plate on the display side and a shielding layer provided on a part of a surface of the back plate on the display side, wherein the colored layer and the shielding layer overlap in at least a part of a region in a plane direction orthogonal to a lamination direction.
Description
Technical Field
The present invention relates to an optical laminate, a method for producing the same, and an image display device.
Background
As various image display devices such as liquid crystal display devices and organic electroluminescence display devices, there is known a configuration in which a front panel is provided on a viewing side of a display panel in order to protect the display panel. When the display panel is a touch panel, the front panel also functions as a touch surface.
Jp 2014-238533 a (patent document 1) describes that a front panel is provided on a visual recognition side of a display panel of an image display device, and a printed layer is provided as a colored layer on a peripheral portion of a surface of the front panel on the display panel side.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open No. 2014-238533
Disclosure of Invention
The present inventors have found the following problems: since the surface on which the colored layer is formed has a level difference corresponding to the height of the colored layer, when the optical layered body is formed by stacking with another layer, air bubbles are generated or a level difference is generated on the visual recognition side surface of the obtained optical layered body.
The invention aims to provide an optical laminate having a colored layer, which suppresses deterioration in visibility due to bubbles and suppresses a step on a visual recognition side surface, and a method for manufacturing the optical laminate. Another object of the present invention is to provide an image display device including the optical laminate.
The invention provides an optical laminate, an image display device and a method for manufacturing the optical laminate.
[ 1] an optical laminate comprising a front plate, a bonding layer, and a back plate in this order from a viewing side to a display side, further comprising:
a colored layer provided on a part of the surface of the front panel on the display side, and
a shielding layer provided on a part of a surface of the rear panel on the display side;
the colored layer and the shielding layer overlap each other in at least a part of a region in a plane direction orthogonal to the lamination direction.
The optical laminate according to [ 1], wherein the blocking layer contains a black pigment.
[ 3 ] the optical laminate according to [ 1] or [ 2 ] に, wherein the optical laminate is divided into a display region and a non-display region in a plane direction orthogonal to the lamination direction,
the optical density of the non-display region is 3 or more.
The optical laminate according to [ 4 ] or [ 3 ], wherein the shielding layer is provided in the non-display region.
The optical laminate according to any one of [ 1] to [ 4 ], wherein the front sheet is a resin film.
The optical laminate according to any one of [ 1] to [ 5 ], wherein the back sheet has a polarizing plate.
An image display device comprising the optical laminate according to any one of [ 1] to [ 6 ], wherein the front panel is disposed on a front surface.
[ 8 ] A method for producing the optical laminate according to any one of [ 1] to [ 6 ], comprising:
forming the colored layer on a part of a display-side surface of the front panel to obtain a front panel with a colored layer;
forming the shielding layer on a part of a surface of the rear panel on the display side to obtain a rear panel with a shielding layer;
and a step of laminating the front plate with the colored layer, the adhesive layer, and the back plate with the shielding layer to obtain the optical laminate.
A method for producing the optical laminate according to claim 1, comprising:
forming the colored layer on a part of a display-side surface of the front panel to obtain a front panel with a colored layer;
a step of laminating the front plate with the colored layer, the adhesive layer, and the back plate to obtain an optical laminate precursor;
and forming the shielding layer on a part of a surface of the back plate of the optical laminate precursor on the display side.
According to the present invention, it is possible to provide an optical laminate having a colored layer, suppressing deterioration of visibility due to bubbles, and suppressing a difference in level of a visual recognition side surface, an image display device having the optical laminate, and a method for manufacturing the optical laminate.
Drawings
Fig. 1 is a schematic cross-sectional view of an optical stack according to an embodiment of the present invention.
Fig. 2 is a schematic sectional view of an image display device according to an embodiment of the present invention.
Fig. 3 is a plan view of the optical layered body viewed from the front panel side.
Figure 4 is a schematic cross-sectional view of an optical stack according to other embodiments of the present invention.
Fig. 5 is a diagram showing an example of a curved form in the case where the image display device is a flexible display.
Fig. 6 is a schematic cross-sectional view of an image display device according to a first embodiment of the present invention.
Fig. 7 is a schematic sectional view of an image display device according to a second embodiment of the present invention.
Fig. 8 is a schematic sectional view of an image display device according to a third embodiment of the present invention.
Fig. 9 is a schematic cross-sectional view of an image display device according to a fourth embodiment of the present invention.
Fig. 10 is a sectional view schematically showing an example of the method for producing an optical laminate according to the present invention.
Fig. 11 is a sectional view schematically showing another example of the method for producing an optical laminate according to the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the drawings below, the scale of each component shown in the drawings is not necessarily the same as the scale of the actual component, and the scale is appropriately adjusted for easy understanding of each component.
[ optical layered body ]
Fig. 1 is a schematic cross-sectional view of an optical stack according to an embodiment of the present invention. The optical laminate 100 of the present embodiment includes a front panel 10, a bonding layer (first bonding layer) 20, and a back panel 30 in this order from the viewing side to the display side. The optical laminate 100 includes a colored layer 40 and a shielding layer 50 different from the colored layer 40. For convenience, the terms of the colored layer and the shielding layer are used, but the colored layer may have a shielding function and the shielding layer may have a coloring function. The coloring layer and the shielding layer may be formed of different materials or may be formed of the same material. The colored layer 40 is provided on a part of the surface of the front panel 10 on the display side. The shielding layer 50 is provided on a part of the display-side surface of the back panel 30. In the optical laminate 100 of the present embodiment, since the adhesive layer 20 and the back surface plate 30 are provided at least between the colored layer 40 and the shielding layer 50, the step on the surface on the viewing side of the optical laminate 100 can be suppressed.
The coloring layer 40 and the shielding layer 50 overlap each other in at least a part of the area in the plane direction orthogonal to the lamination direction. Fig. 1 shows a state in which the coloring layer 40 and the shielding layer 50 are overlapped over the entire area in a plane direction orthogonal to the lamination direction.
The optical stack 100 may further stack an optical sheet not shown in fig. 1. Examples of the optical sheet include a front optical sheet stacked at a position between the back sheet 30 and the front sheet 10, and a rear optical sheet stacked at a position opposite to the front sheet 10 with respect to the back sheet 30. The optical laminate 100 can be divided into a display region X and a non-display region Y in a plane direction orthogonal to the lamination direction, and the region where the shielding layer 50 is provided is usually the non-display region Y. For example, a region having an optical density of 3 or more may be set as the non-display region Y, and a region having an optical density of less than 3 may be set as the display region X. The optical density of the non-display region Y is preferably 3 or more, and more preferably 3.2 or more. When the optical density of the non-display region Y is within the above numerical range, elements such as wiring disposed in the non-display region Y are sufficiently shielded, and the visibility of the image in the display region X is improved. The optical density of the non-display region B may be 10 or less, or may be 7 or less. The optical density can be measured, for example, using 361T manufactured by X-Rite.
[ image display apparatus ]
Fig. 2 is a schematic sectional view of an image display device according to an embodiment of the present invention. The image display device 300 of the present embodiment includes the optical laminate 100 disposed on the front surface, the display laminate 200 including the display unit, and the second adhesive layer 21 interposed between the optical laminate 100 and the display laminate 200. The optical laminate 100 has the same structure as the optical laminate 100 shown in fig. 1.
Fig. 3 is a plan view of the image display device 300 viewed from the front panel 10 side. The shape and color of the colored layer 40 are visually recognized through the front panel 10, and therefore affect the design of the image display device 300. In the present embodiment, the visually recognizable surface of the colored layer 40 is smooth by being in contact with the surface of the front panel 10, and therefore contributes to improvement in design. The colored layer 40 may be formed at a position overlapping with the shielding layer 50 in at least a part of the area in the plane direction orthogonal to the lamination direction, and the arrangement position in the plane direction is not limited. As in the image display device 300 shown in fig. 2 and 3, the colored layer 40 is disposed in the peripheral portion, whereby light leakage can be suppressed, and the colored layer can be visually recognized as a frame, whereby the design can be improved. The colored layer 40 can also contribute to an increase in the optical density of the non-display region Y.
The shielding layer 50 is preferably disposed in the non-display region Y, and contributes to an increase in optical density of the non-display region Y.
In this embodiment, the optical density of the non-display region Y can be adjusted mainly by the shielding layer 50 and can be further adjusted by the coloring layer 40. Therefore, the thickness of the colored layer 40 is adjusted so that bubbles do not occur at the interface when the colored layers are stacked, and the thickness of the shielding layer 50 is preferably adjusted so that the optical density of the non-display region Y becomes a desired value. The thickness of the shielding layer 50 is also preferably adjusted so that no air bubbles are generated at the interface during lamination, but the shielding layer 50 is located farther from the visual recognition side than the colored layer 40, and therefore air bubbles generated in the vicinity thereof are difficult to be visually recognized. Further, by adjusting the width of the colored layer 40 (particularly, the position of the end face on the display region side), bubbles generated in the vicinity of the shielding layer 50 can be prevented from being visually recognized. In the shielding layer 50, the optical density of the non-display region Y can be adjusted by the amount of the black pigment blended other than the thickness.
The thickness of the shielding layer 50 is preferably 1 μm to 13 μm, and more preferably 2 μm to 10 μm.
The thickness of the colored layer 40 is preferably 13 μm or less, more preferably 10 μm or less, and further preferably 8 μm or less. When the thickness of the colored layer 40 is within the above numerical range, bubbles generated at the interface during lamination can be suppressed, and a step generated on the visual recognition side surface of the optical laminate after lamination can be suppressed. The thickness of the colored layer 40 is preferably 1 μm or more, and more preferably 2 μm or more. When the thickness of the colored layer 40 is 1 μm or more, the colored layer 40 is easily visually recognized, and contributes to improvement of design and improvement of optical density of the non-display region Y.
The total thickness of the colored layer 40 and the shielding layer 50 is preferably 20 μm or less, more preferably 15 μm or less, and still more preferably 12 μm or less. When the amount is within the above range, the height difference on the surface on the viewing side of the optical layered body can be suppressed from becoming conspicuous.
In fig. 1 and 2, the colored layer 40 and the shielding layer 50 are illustrated as having uniform thicknesses and rectangular cross-sectional shapes, but the colored layer 40 and the shielding layer 50 may have non-uniform thicknesses, and for example, the end surface on the display region side may have a cross-sectional shape having a tapered portion with a thickness decreasing toward the inside. The angle of the tapered portion is, for example, 15 ° to 85 °. By having the tapered portion, the biting of air which is likely to occur at the time of lamination can be suppressed. When the thicknesses of the colored layer 40 and the shielding layer 50 are not uniform, the numerical range described above as the thicknesses of the colored layer 40 and the shielding layer 50 is the maximum thickness of the colored layer 40 and the shielding layer 50.
Fig. 1 and 2 show an embodiment in which the coloring layer 40 and the shielding layer 50 have the same width, but the coloring layer 40 and the shielding layer 50 may overlap in a partial region. Fig. 4 is a schematic cross-sectional view of an optical laminate 100' according to another embodiment in which the relationship between the width of the colored layer 40 and the width of the shielding layer 50 is different from that of the optical laminate 100 shown in fig. 1. In the optical laminate 100', the width of the colored layer 40 is wider inward than the width of the shielding layer 50, and the inner end surface 40a of the colored layer 40 has a tapered portion whose thickness is reduced inward.
In the optical layered body 100', since the width of the colored layer 40 is wider inward than the width of the shielding layer 50, the inner end surface 50a of the shielding layer 50 is less likely to be visually recognized, and even when air bubbles are mixed in the vicinity of the end surface 50a of the shielding layer 50, deterioration in appearance can be suppressed.
The shape and size of the optical layered body 100, 100' in the plane direction correspond to those of the image display device 300 using the same. The shape of the image display device 300 in the plane direction is preferably a square shape, and more preferably a square shape having long sides and short sides. The square shape is preferably rectangular. When the shape of the image display device 300 in the plane direction is rectangular, the length of the long side is, for example, 50mm to 300mm, preferably 100mm to 280 mm. The length of the short side is, for example, 30mm to 250mm, preferably 60mm to 220 mm. When the optical layered body 100 has a square shape, at least one of the R process, the notch process, and the punching process may be performed.
The thickness of the optical layered body 100, 100' is preferably appropriately designed according to the functions of the front plate 10 and the back plate 30, and is not particularly limited, and is, for example, 40 μm to 300 μm, and preferably 70 μm to 200 μm.
The image display device 300 may be configured as a flexible display panel. Fig. 5(a) and 5(b) show examples of a curved form in the case where the image display device is a flexible display panel. Fig. 5(a) shows a foldable flexible display 305 having a visual recognition side surface as an inner side, and fig. 5(b) shows a rollable flexible display 306.
The image display device 300 may be configured as a touch panel type image display device. The touch panel type image display device includes a touch sensor panel, and the front panel 10 included in the optical laminate 100 constitutes a touch surface.
Hereinafter, the image display device of the present invention will be described in detail by showing specific embodiments thereof.
< first embodiment >
Fig. 6 is a schematic cross-sectional view of an image display device according to a first embodiment of the present invention. The image display device of the present embodiment is a touch panel liquid crystal display device. The liquid crystal display device 301 includes, in order from the viewing side, a front panel 10, a first adhesive layer 20, a polarizing plate 60a, a second adhesive layer 21, a touch sensor panel 70, a liquid crystal display element unit 81, a polarizing plate 60b, and a backlight unit 90. The colored layer 40 is provided on a part of the surface of the front panel 10 on the display side. The shielding layer 50 is provided on a part of the surface of the polarizing plate 60a on the display side. The liquid crystal display device 301 can be divided into a display region X and a non-display region Y in the plane direction, and in this case, the non-display region Y is usually provided with the shielding layer 50.
In the liquid crystal display device 301, a laminate including the front panel 10, the first adhesive layer 20, and the polarizing plate 60a and including the colored layer 40 and the shielding layer 50 is configured as an optical laminate 101, and the liquid crystal display device 301 is configured using the optical laminate 101. In the present embodiment, the polarizing plate 60a also functions as the back panel 30 of the optical laminate 101.
< second embodiment >
Fig. 7 is a schematic sectional view of an image display device according to a second embodiment of the present invention. The image display device of the present embodiment is a touch panel liquid crystal display device. The liquid crystal display device 302 differs from the liquid crystal display device 301 shown in fig. 6 only in the following respects: the lamination position of the polarizing plate 60a and the touch sensor panel 70 is changed, the colored layer 40 is provided on a part of the surface on the display side of the front panel 10, and the shielding layer 50 is provided on the surface on the display side of the touch sensor panel 70.
The liquid crystal display device 302 includes the front panel 10, the first adhesive layer 20, and the touch sensor panel 70, and the optical laminate 102 is a laminate including the colored layer 40 and the shielding layer 50, and the liquid crystal display device 302 is configured using the optical laminate 102. In the present embodiment, the touch sensor panel 70 also functions as the back surface plate 30 of the optical layered body 102.
< third embodiment >
Fig. 8 is a schematic sectional view of an image display device according to a third embodiment of the present invention. The image display device of the present embodiment is a touch panel type organic Electroluminescence (EL) display device. The organic EL display device 303 includes a front panel 10, a first adhesive layer 20, a polarizing plate 60c, a second adhesive layer 21, a touch sensor panel 70, and an organic EL unit 82 in this order from the viewing side. The organic EL display device 303 includes a colored layer 40 provided on a part of the surface of the front panel 10 on the display side, and a shielding layer 50 provided on a part of the surface of the polarizing plate 60c on the display side. The organic EL display device 303 can be divided into a display region X and a non-display region Y in the plane direction, and in this case, the shielding layer 50 is usually provided in the non-display region Y.
In the organic EL display device 303, the front panel 10, the first adhesive layer 20, and the polarizing plate 60c constitute an optical laminate 103, which is a laminate including the colored layer 40 and the shielding layer 50, and the organic EL display device 303 is constituted by using the optical laminate 103. In the present embodiment, the polarizing plate 60c also functions as the back panel 30 of the optical layered body 103.
< fourth embodiment >
Fig. 9 is a schematic cross-sectional view of an image display device according to a fourth embodiment of the present invention. The image display device of the present embodiment is a touch panel type organic EL display device. The organic EL display device 304 differs from the organic EL display device 303 shown in fig. 8 only in the following respects: the polarizing plate 60c and the touch sensor panel 70 are stacked, and the colored layer 40 and the shielding layer 50 are provided on the display-side surface of the front panel 10 and the display-side surface of the touch sensor panel 70, respectively.
The organic EL display device 304 is configured by the front panel 10, the first adhesive layer 20, and the touch sensor panel 70, and the optical laminate 104 is configured by a laminate including the colored layer 40 and the shielding layer 50, and the organic EL display device 304 is configured by using the optical laminate 104. In the present embodiment, the touch sensor panel 70 also functions as the back surface plate 30 of the optical layered body 104.
(display unit)
Examples of the display unit included in the image display device 300 include display units including display elements such as liquid crystal display elements, organic EL display elements, inorganic EL display elements, plasma display elements, and field emission display elements.
The image display device 300 may be used as a flexible display. In this case, the display element is preferably a liquid crystal display element, an organic EL display element, or an inorganic EL display element in view of flexibility.
(front panel)
The material and thickness of the front panel 10 are not limited as long as the front panel is a plate-shaped body capable of transmitting light, and may be a single layer or a multilayer, and examples thereof include a plate-shaped body made of glass (e.g., a glass plate, a glass film, etc.), a plate-shaped body made of resin (e.g., a resin plate, a resin sheet, a resin film, etc.), and a laminate of a plate-shaped body made of resin and a plate-shaped body made of glass. The front panel 10 may constitute the outermost surface of the image display device.
As the glass plate, tempered glass for display is preferably used. The thickness of the glass plate is, for example, 10 to 1000 μm, and 50 to 1000 μm. By using the glass plate, the front panel 10 having excellent mechanical strength and surface hardness can be configured.
The resin film is not limited as long as it is a resin film that can transmit light.
Examples of the film include films formed of polymers such as triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, levulinyl cellulose, polyester, polystyrene, polyamide, polyetherimide, polyacrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more. When the image display device 300 is a flexible display, a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide, which can be configured to have excellent flexibility, high strength, and high transparency, is preferably used.
The resin film may be a film in which a hard coat layer is provided on at least one surface of the base film to further increase the hardness. The hard coat layer may be formed on one surface of the base film or on both surfaces. When the image display device 300 is a touch panel type image display device, the surface of the front panel 10 is a touch surface, and therefore, a resin film having a hard coat layer is preferably used. By providing the hard coat layer, a resin film having improved hardness and scratch resistance can be produced. The hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coat layer may contain an additive in order to increase hardness. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof. The thickness of the resin film is, for example, 30 to 2000. mu.m.
The front panel 10 may have a function of a touch sensor, a blue light cut-off function, a viewing angle adjustment function, and the like, in addition to a function of protecting the front surface of the image display device 300.
(first adhesive layer)
The first adhesive layer 20 is a layer interposed between the front panel 10 and the back panel 30, and is an adhesive layer or an adhesive layer. The first adhesive layer 20 is preferably an adhesive layer in view of absorbing the difference in height of the colored layer 40 satisfactorily.
The pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin as a main component. Among them, preferred is an adhesive composition containing a (meth) acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance and the like. The adhesive composition may be an active energy ray-curable type or a heat-curable type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer in which 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers is preferably used. The base polymer preferably copolymerizes polar monomers. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may contain only the above-mentioned base polymer, but usually contains a crosslinking agent. Examples of the crosslinking agent include a crosslinking agent which is a metal ion having a valence of 2 or more and forms a metal carboxylate salt with a carboxyl group; a crosslinking agent which is a polyamine compound and forms an amide bond with a carboxyl group; a crosslinking agent which is a polyepoxy compound, a polyol and forms an ester bond with a carboxyl group; a crosslinking agent which is a polyisocyanate compound and forms an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition having a property of being cured by irradiation with an active energy ray such as ultraviolet ray or electron beam, having an adhesive property even before irradiation with the active energy ray so as to be capable of being closely adhered to a coated member such as a film, and having a property of being cured by irradiation with the active energy ray and being adjustable. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The adhesive composition may further contain an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, a photopolymerization initiator, a photosensitizer and the like are also contained as necessary.
The pressure-sensitive adhesive composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, a pressure-sensitive adhesive applying agent, a filler (metal powder, other inorganic powder, and the like), an antioxidant, an ultraviolet absorber, a dye, a pigment, a colorant, an antifoaming agent, an anti-corrosion agent, and a photopolymerization initiator for imparting light scattering properties.
The organic solvent diluted solution of the adhesive composition may be applied to a substrate and dried. In the case of using an active energy ray-curable pressure-sensitive adhesive composition, a cured product having a desired degree of curing can be obtained by irradiating the formed pressure-sensitive adhesive layer with an active energy ray.
The thickness of the first adhesive layer 20 is preferably larger than the thickness of the colored layer 40, for example, preferably 3 μm to 100 μm, and more preferably 5 μm to 50 μm, from the viewpoint of absorbing the difference in level of the colored layer 40.
(Back plate)
The material and thickness of back plate 30 are not limited as long as it is a plate-like body that can transmit light, and it may be a single layer or a plurality of layers. The thickness of the back plate may be 5 μm to 1000 μm, preferably 50 μm to 500 μm. The back panel may not include the display unit.
As described above, the rear plate 30 may be configured using components used in a general image display device, such as the polarizing plates 60a and 60c and the touch sensor panel 70. By using such a component, rear plate 30 is preferable because the number of components of image display device 300 can be reduced, and image display device 300 can be made thinner.
Although the case where the polarizing plates 60a and 60c and the touch sensor panel 70 are also used as the back panel 30 has been described above, the back panel 30 is not limited thereto, and may be a protective film on the viewing side of the polarizing plate or a laminate of the polarizing plate and the touch sensor panel.
As the rear panel 30, a glass plate (e.g., a glass plate, a glass film, etc.) or a resin plate (e.g., a resin plate, a resin sheet, a resin film, etc.) may be used, as in the case of the front panel 10. The above description of the front panel 10 is applied as a specific example of the glass plate-like body and the resin plate-like body.
(colored layer)
The shape and color of the colored layer 40 are not limited, and can be appropriately selected according to the use and design of the image display device. The colored layer 40 contains a colorant. The colored layer 40 may be formed of a single layer, or may be formed of a plurality of layers. When the colored layer 40 is formed of a plurality of layers, at least one of the plurality of layers is a colorant-containing layer containing a colorant, and the remaining layers may or may not contain a colorant. Examples of the color of the colorant include black, red, white, dark blue, silver, and gold. The colored layer 40 has a colorant-containing layer having high light-shielding properties, a base layer for improving adhesion, or the like below the colorant-containing layer containing a colorant. Further, a transparent protective layer may be provided to cover the colorant-containing layer.
The colorant may be appropriately selected according to the desired color. Examples of the colorant include inorganic pigments such as carbon black such as titanium dioxide, zinc oxide, and acetylene black, iron black, red iron oxide, chrome vermilion, ultramarine blue, cobalt blue, chrome yellow, and titanium yellow; organic pigments or dyes such as phthalocyanine blue, indanthrone blue, isoindolone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black, and the like; metallic pigments made of scaly foils of aluminum, brass, and the like; a pearl lustre pigment (pearl pigment) is composed of flake foils such as titanium dioxide coated mica and alkaline basic lead carbonate. In this specification, the metal contained in the plating layer is also contained in the colorant.
Each layer of the colored layer 40 can be formed by a printing method, a coating method, a plating method, a photolithography method, or the like. Colored layer 40 may be formed directly on the surface of back surface plate 30, or may be formed on another substrate and transferred to the surface. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. The printing is repeated by the printing method to obtain a colored layer 40 having a desired thickness. Examples of the ink used in the printing method include inks containing a colorant, a binder, a solvent, and an optional additive.
Examples of the binder include chlorinated polyolefins (e.g., chlorinated polyethylene and chlorinated polypropylene), polyester resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. The binder resin may be used alone or in combination of 2 or more. The binder resin may be a thermally polymerizable resin or a photopolymerizable resin.
When the colorant-containing layer is formed by a printing method, it is preferable to use an ink containing 50 to 200 parts by mass of the colorant per 100 parts by mass of the binder resin.
Specific examples of the plating method include known plating methods such as electroplating, electroless plating, hot dip plating, chemical vapor deposition, and physical vapor deposition. Examples of physical vapor deposition include evaporation systems including methods of heating and evaporating an evaporation source such as vacuum vapor deposition, molecular beam vapor deposition, and ion beam vapor deposition, and sputtering systems such as magnetron sputtering and ion beam sputtering. These methods may be combined to characterize the pattern as desired. In this specification, a layer formed by a plating method is referred to as a plating layer.
When the colored layer 40 is provided in the peripheral portion of the rear panel 30, the configuration is not limited to the configuration provided over the entire periphery of the peripheral portion, and may be provided only in a part of the peripheral portion in accordance with a desired design or the like. When the colored layer 40 is provided in the peripheral portion of the back plate 30, the width may be appropriately determined depending on the size of the display region, the desired design, and the like, and is preferably in the range of 1mm to 20mm, for example.
(polarizing plate)
Examples of the polarizing plate include a stretched film having a dichroic dye adsorbed thereon, a film obtained by coating and curing a dichroic dye thereon, and the like as a polarizer.
As the dichroic dye, specifically, iodine or a dichroic organic dye is used. The dichroic organic dye includes a dichroic direct dye composed of a bisazo compound such as c.i. direct RED 39, and a dichroic direct dye composed of a compound such as trisazo or tetrazo. Examples of the film coated with a dichroic dye used as a polarizer include a stretched film having a dichroic dye adsorbed thereon, and a film having a layer obtained by coating and curing a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal. A film obtained by applying and curing a dichroic dye is preferable because the direction of bending is not limited as compared with a stretched film having a dichroic dye adsorbed thereon.
(1) Polarizing plate having stretched film as polarizer
A polarizing plate having a stretched film having a dichroic dye adsorbed thereon as a polarizer will be described. A stretched film as a polarizer, to which a dichroic dye is adsorbed, is generally produced through the following steps: the method for producing a polyvinyl alcohol film comprises a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing a dichroic dye by dyeing the polyvinyl alcohol resin film with the dichroic dye, a step of treating the polyvinyl alcohol resin film adsorbed with the dichroic dye with an aqueous boric acid solution, and a step of washing the polyvinyl alcohol resin film after the treatment with the aqueous boric acid solution. The polarizer may be used as it is as a polarizing plate, and a transparent protective film may be bonded to one or both surfaces of the polarizer to be used as a polarizing plate. The thickness of the polarizer thus obtained is preferably 2 μm to 40 μm.
The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfone acids, and acrylamides having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually about 1000 to 10000, and preferably in the range of 1500 to 5000.
The polyvinyl alcohol resin is used as a raw film of a polarizing plate. The method for producing the polyvinyl alcohol resin is not particularly limited, and a known method can be used to produce the film. The thickness of the polyvinyl alcohol base raw sheet film may be, for example, about 10 μm to 150 μm.
The uniaxial stretching of the polyvinyl alcohol resin film may be performed before, simultaneously with or after the dyeing with the dichroic dye. In the case of uniaxial stretching after dyeing, the uniaxial stretching may be performed before boric acid treatment or may be performed during boric acid treatment. In addition, uniaxial stretching may be performed at these plural stages. In the case of uniaxial stretching, the stretching may be performed uniaxially between rolls having different peripheral speeds, or may be performed uniaxially using a heat roll. The uniaxial stretching may be dry stretching in which stretching is performed in the air, or wet stretching in which stretching is performed in a state where the polyvinyl alcohol resin film is swollen with a solvent. The draw ratio is usually about 3 to 8 times.
The material of the protective film to be bonded to one or both surfaces of the polarizer is not particularly limited, but examples thereof include films known in the art, such as a cyclic polyolefin resin film, a cellulose acetate resin film made of a resin such as triacetyl cellulose or diacetyl cellulose, a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate, a polycarbonate resin film, a (meth) acrylic resin film, and a polypropylene resin film. From the viewpoint of light thinning, the thickness of the protective film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, and usually 5 μm or more, preferably 20 μm or more. The protective film may or may not have a phase difference.
(2) Polarizing plate having polarizer made of film formed of liquid crystal layer
A polarizing plate including a film formed of a liquid crystal layer as a polarizer will be described. Examples of the dichroic dye-coated film used as a polarizer include a composition containing a dichroic dye having liquid crystallinity, a composition containing a dichroic dye and a liquid crystal compound, and a film obtained by coating and curing the composition on a substrate. The film may be used as a polarizing plate by peeling off a substrate or using the film together with a substrate, or as a polarizing plate having a protective film on one surface or both surfaces thereof. Examples of the protective film include those similar to the polarizing plate including the above-described stretched film as a polarizer.
The film obtained by applying and curing the dichroic dye is preferably thin, and if it is too thin, the strength tends to be reduced, and the processability tends to be poor. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 to 3 μm.
Specific examples of the film obtained by applying the dichroic dye include films described in japanese patent application laid-open nos. 2013-37353 and 2013-33249.
The polarizing plate may further include a retardation film. In this embodiment, the polarizing plate may be a circular polarizing plate. The retardation film may include 1 or 2 or more retardation layers. The retardation layer may be a positive A plate or a negative A plate, or a positive C plate or a negative C plate, such as a λ/4 layer or a λ/2 layer. The retardation layer may be formed of a resin film exemplified as a material of the above-described protective film, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation film may further include an alignment film or a substrate film.
(touch sensor panel)
The touch sensor panel is not limited to a detection method as long as it is a sensor capable of detecting a touched position, and examples thereof include touch sensor panels of a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. From the viewpoint of low cost, a resistive-film type or capacitive-coupling type touch sensor panel is preferably used.
An example of a resistive touch sensor panel includes a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, a transparent conductive film as a resistive film provided on the inner front surface of each substrate, and a touch position detection circuit. In an image display device provided with a resistive touch sensor panel, when the front surface of the front panel 10 is touched, the opposing resistive films are short-circuited, and a current flows through the resistive films. The touch position detection circuit detects a change in voltage at that time, and detects a touched position.
An example of a capacitive coupling type touch sensor panel includes a substrate, a position detection transparent electrode provided on the entire surface of the substrate, and a touch position detection circuit. In an image display device provided with a capacitive coupling type touch sensor panel, when the front surface of the front panel 10 is touched, the transparent electrode is grounded via the electrostatic capacitance of the human body at the touched point. The touch position detection circuit detects the grounding of the transparent electrode and detects the touched position.
In the touch sensor panel, for example, the above-described resistive film type or capacitive coupling type touch sensor panel is formed on the base layer with the separation layer interposed therebetween, and the separation layer may be separated between the base layer and the separation layer to expose the separation layer on the outermost surface.
(Barrier layer)
The width of the shielding layer 50 in the plane direction is not particularly limited, and is, for example, preferably the same as or narrower than the width of the colored layer 40 in the plane direction, and more preferably the end face on the display area side does not protrude from the end face on the display area side of the colored layer 40. The shielding layer 50 may be formed of the same material as the material exemplified as the coloring layer 40. The shielding layer 50 preferably contains a colorant. The colorant preferably contains a colorant having a high function of increasing the optical density, and for example, preferably contains a black pigment such as carbon black or iron black. The shielding layer 50 may be formed of a single layer, or may be formed of a plurality of layers.
The shielding layer 50 can be formed by a printing method, a coating method, a photolithography method, or the like. The shielding layer 50 is formed directly on the display side surface of the back panel 30, and may be formed on another substrate and transferred to the surface of the back panel 30. The above description of the colored layer 40 is applied to the printing method.
(second adhesive layer)
The second adhesive layer 21 is an adhesive layer or an adhesive layer. When the second adhesive layer 21 is provided in a position in contact with the colored layer 40 or the shielding layer 50, the adhesive layer is preferable from the viewpoint of being able to favorably absorb these height differences. The above description of the first laminate layer 20 is applied as a material of the second laminate layer 21. The thickness of the second adhesive layer 21 is preferably larger than the thickness of the mask layer 50, for example, preferably 3 to 100 μm, and more preferably 5 to 50 μm, from the viewpoint of absorbing the difference in height of the mask layer 50.
[ method for producing optical laminate ]
Fig. 10(a) and (b) are cross-sectional views schematically showing an embodiment of the method for manufacturing the optical laminate 100 of the present invention. As shown in fig. 10(a), the manufacturing method of the present embodiment includes: a step of forming a colored layer 40 on a part of the display-side surface of the front panel 10 to obtain a front panel 10' with a colored layer; and forming a shielding layer 50 on a part of the display-side surface of the rear plate 30 to obtain a rear plate 30' with a shielding layer. Next, as shown in fig. 10(b), the optical laminate 100 is manufactured through a step of laminating the front surface 10 'with the colored layer and the back surface plate 30' with the shielding layer via the adhesive layer 20 such that the surface on the display side of the front surface plate 10 'with the colored layer and the surface on the viewing side of the back surface plate 30' with the shielding layer face each other. The adhesive layer 20 may be first adhered to the display-side surface of the colored-layer-attached front panel 10 ', or may be first adhered to the viewing-side surface of the barrier-layer-attached back panel 30'. According to the manufacturing method of the present embodiment, the generation of bubbles in the adhesive layer 20 can be suppressed.
In the above-described manufacturing method, it is preferable that alignment marks be provided on the colored layer 40 and the shielding layer 50, and the front panel 10 'with the colored layer and the back panel 30' with the shielding layer be laminated so as to have a desired positional relationship while detecting the distance between the alignment marks. This stacking can improve the positional accuracy.
Fig. 11(a), (b), and (c) are cross-sectional views schematically showing another embodiment of the method for producing the optical laminate 100 of the present invention. In the manufacturing method of the present embodiment, first, as shown in fig. 11(a), a process of forming a colored layer 40 on a part of the display-side surface of the front panel 10 to obtain a front panel 10' with a colored layer is performed. Next, as shown in fig. 11(b), the optical laminate precursor 100a is obtained through a step of laminating the front plate 10 'with the colored layer and the back plate 30 via the adhesive layer 20 such that the surface on the display side of the front plate 10' with the colored layer faces the surface on the viewing side of the back plate 30. The adhesive layer 20 may be first adhered to the display-side surface of the colored-layer-attached front panel 10', or may be first adhered to the visually recognizable surface of the back panel 30. Finally, as shown in fig. 11(c), a step of forming a shielding layer 50 on a part of the surface of the back panel 30 on the display side of the optical laminate precursor 100a is performed to manufacture the optical laminate 100. According to the manufacturing method of the present embodiment, the generation of bubbles in the adhesive layer 20 can be suppressed.
The manufacturing method shown in fig. 10 or 11 may be a method of manufacturing a large-sized optical laminate and then dicing and separating the optical laminate to manufacture a single-sheet optical laminate, or may be a method of manufacturing a single-sheet optical laminate by dicing and arranging end faces. In this case, the cut surface is selected so that the colored layer 40 and the shielding layer 50 are exposed at the cut surface. According to these methods, even if bubbles are generated in the vicinity of the end surface of the colored layer 40 and the shielding layer on the non-display region side at the time of lamination, the portion where the bubbles are mixed can be cut and removed.
Use of an image display device
The image display device of the invention can be used as mobile equipment such as smart phones and tablet computers, televisions, digital photo frames, digital signage, measuring instruments, meters, office equipment, medical equipment, computer equipment and the like. According to the present invention, it is possible to suppress the generation of bubbles in the first adhesive layer 20 which is easy to visually recognize, and to suppress the step on the visually recognized side surface of the front panel 10, and therefore it is possible to provide a high-quality image display device which suppresses the generation of defects in appearance.
Examples
The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples.
< preparation of composition for Forming colorant-containing layer (Black) >
[ ink Components ]
Acetylene black 15% by mass
75% by mass of polyester
Dimethyl glutarate 2.5% by mass
Succinic acid 2% by mass
5.5% by mass of isophorone
[ curing agent ]
75% by mass of aliphatic polyisocyanate
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ method of preparation ]
10 parts by mass of a curing agent and 10 parts by mass of a solvent were added to 100 parts by mass of the ink components, and the mixture was stirred to obtain a colorant layer-containing composition (black color).
< preparation of composition for Forming coloring-agent-containing layer (white) >
[ ink Components ]
39% by mass of a polyester
Dimethyl glutarate 2.5% by mass
Succinic acid 2% by mass
6.5% by mass of isophorone
[ curing agent ]
75% by mass of aliphatic polyisocyanate
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ method of preparation ]
The curing agent 10 parts by mass and the solvent 10 parts by mass were added to 100 parts by mass of the ink components, and the mixture was stirred to obtain a colorant layer-containing composition (white).
< preparation of composition for Forming protective layer (transparent) >
[ ink component ] polyester 90% by mass
Dimethyl glutarate 2.5% by mass
Succinic acid 2% by mass
5.5% by mass of isophorone
[ curing agent ] aliphatic polyisocyanate 75% by mass
25% by mass of ethyl acetate
[ solvent ]
Isophorone
[ production method ]
The curing agent 10 parts by mass and the solvent 10 parts by mass were added to 100 parts by mass of the ink components, and the mixture was stirred to obtain a composition for forming a protective layer.
< example 1 >
(preparation of front Panel)
As the front panel 10, a window film having a thickness of 70 μm (50 μm for the base film, 10 μm for each hard coat layer, 177mm in length × 105mm in width) in which hard coats were formed on both surfaces of the base film was prepared. The base film of the window film is a polyimide resin film, and the hard coat layer is a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
(preparation of Back plate)
As the back plate 30, a circularly polarizing plate is prepared. Specifically, an alignment film composition was applied to one surface of a 25 μm thick TAC film (manufactured by konica minolta corporation), and the resultant was dried and irradiated with polarized UV light to form a photo-alignment film. A composition containing a dichroic dye and a polymerizable liquid crystal compound was applied onto the photo alignment film, dried, and then cured by ultraviolet irradiation to form a polarizer (thickness 2.5 μm). A protective layer composition comprising polyvinyl alcohol and water was applied to the surface of the polarizer opposite to the TAC film side and dried to form a protective layer (thickness: 1 μm). Thus, a linear polarizing plate was obtained.
A circularly polarizing plate was obtained by laminating a retardation film on the lambda/4 layer side described later on the protective layer of the linearly polarizing plate. The retardation film had a thickness of 15 μm and a structure in which a pressure-sensitive adhesive layer, a λ/4 layer, a pressure-sensitive adhesive layer, and a positive C layer were sequentially laminated. The adhesive layers were each 5 μm thick. The lambda/4 layer had a layer obtained by curing a liquid crystal compound and an alignment film, and had a thickness of 2 μm. The positive C layer had a layer obtained by curing a liquid crystal compound and an alignment film, and had a thickness of 3 μm. Thus, a circularly polarizing plate (177 mm in length × 105mm in width) having layers of "TAC film/optical alignment film/polarizer/protective layer/retardation film" was prepared.
(preparation of adhesive layer)
As the first adhesive layer 20, a (meth) acrylic pressure-sensitive adhesive layer (thickness 25 μm, 177mm in length by 105mm in width) was prepared.
(formation of coloring layer and shielding layer)
Next, on the display-side surface of the front panel 10, the prepared colorant-containing layer-forming composition (black) was used as an ink, and printing was performed by screen printing using a 460-mesh screen so that the applied thickness after drying was 3 μm, and the discharge amount was set to 3 μm, and a colored layer 40 composed of a black printed layer having a thickness of 3 μm and a width of 5mm was formed over the entire circumference of the peripheral portion, thereby obtaining a front panel 10' with a colored layer (fig. 10 (a)). A black printed layer (having a thickness of 3 μm) was formed on the surface of the retardation film of the circularly polarizing plate (the surface on the display side of the rear plate 30) in the same manner as the colored layer 40 to form a shielding layer 50, thereby obtaining a rear plate 30' with a shielding layer (fig. 10 (a)).
(laminating step)
The surface of the prepared front panel 10' with the color layer on the display side and one surface of the (meth) acrylic adhesive layer were subjected to corona treatment, and the corona-treated surfaces were bonded to each other. Next, the surface exposed to the (meth) acrylic pressure-sensitive adhesive layer and the surface on the viewing side of the rear panel 30' with a shielding layer were subjected to corona treatment, and the corona-treated surfaces were bonded to each other, and bonded to each other using a roll bonding machine, and cured in an autoclave, to obtain an optical laminate of example 1.
The corona treatment was carried out under the following conditions.
Frequency: 20 kHz/Voltage: 8.6 kV/power: 2.5 kW/speed: 6 m/min
< example 2 >
An optical laminate of example 2 was obtained in the same manner as in example 1, except that the colored layer and the shielding layer were formed by the following method.
(formation of coloring layer and shielding layer)
On the surface of the front panel 10 on the display side, an electron beam deposition apparatus (product name: UNIVAC2050, manufactured by UNIVAC corporation) was used and TiO was added2For formation of evaporation source
On the deposition layer of (3), In is used as a deposition source
A vapor deposition layer of thickness of (1) on which TiO is deposited2For formation of evaporation source
A vapor deposition layer of thickness of (1), on which Al is deposited2O3For formation of evaporation source
The thickness of (3) is as small as possible. Thus, a gold vapor-deposited layer (thickness < 1 μm) composed of 4 layers was formed. Then, in the colored layer formation region, the gold vapor-deposited layer in the region where the protective layer was not formed was removed by etching by forming a protective layer by screen printing using the above-prepared composition for forming a protective layer (transparent) as an ink and drying it with a 460-mesh screen, and printing the gold vapor-deposited layer with a coating thickness of 5 μm. Thus, the colored layer 40 having a layer composition (the entire thickness is more than 5 μm and less than 6 μm) of "gold vapor deposition layer (thickness < 1 μm)/protective layer (thickness 5 μm)" is formed on the entire periphery of the peripheral portion.
Next, on the surface of the retardation film of the circularly polarizing plate (the surface on the display side of the rear panel 30), the same printing as that in the formation of the shielding layer in example 1 was performed 2 times, and the shielding layer 50 having a layer structure of "black printed layer (thickness 3 μm)/black printed layer (thickness 3 μm)" (thickness of 6 μm as a whole) was formed.
< example 3 >
An optical laminate of example 3 was obtained in the same manner as in example 1, except that the coloring layer and the shielding layer were formed in the following manner.
(formation of coloring layer and shielding layer)
On the surface of the front panel 10 on the display side, the same printing as that in the case of the colored layer formation in example 1 was performed 3 times using the prepared colorant layer-containing composition (white), and the colored layer 40 having a layer structure of "white printed layer (thickness 3 μm)/white printed layer (thickness 3 μm)" (thickness 9 μm as a whole) was formed.
Next, on the surface of the retardation film of the circularly polarizing plate (the surface on the display side of the rear panel 30), the same printing as that in the formation of the shielding layer in example 1 was performed 2 times, and the shielding layer 50 having a layer structure of "black printed layer (thickness 3 μm)/black printed layer (thickness 3 μm)" (thickness of 6 μm as a whole) was formed.
< comparative example 1 >
An optical laminate of comparative example 1 was obtained in the same manner as in example 1, except that the method of forming the colored layer and the formation surface were different as follows and no shielding layer was formed.
(formation of colored layer)
On the TAC surface (the surface on the viewing side of the back sheet 30) of the circularly polarizing plate, "black printed layer (thickness 3 μm)/black printed layer (thickness 3 μm)" was formed by performing printing 2 times in the same manner as the printing in the formation of the colored layer in example 1. On the colored layer 40, the same printing as that in the formation of the colored layer in example 3 was performed, and a layer composition (entire thickness 15 μm) of "white printed layer (thickness 3 μm)/white printed layer (thickness 3 μm)" and "black printed layer (thickness 3 μm)/white printed layer (thickness 3 μm)" was formed.
[ evaluation of bubble Generation ]
The optical laminates of examples 1 to 3 and comparative example 1 were visually observed to confirm the occurrence of bubbles, and evaluated according to the following criteria. The evaluation results are shown in table 1.
A: no air bubbles were observed after the bonding,
b: a slight amount of bubbles were observed after the bonding, but no bubbles were observed after the autoclave treatment,
c: bubbles were observed only around the colored layer in the lamination layer (non-display area),
d: bubbles were observed in the periphery (non-display region) and the display region of the colored layer in the adhesive layer.
[ evaluation of height Difference ]
The optical layered bodies of examples 1 to 3 and comparative example 1 were measured for the difference between the highest height and the lowest height of the outermost surface of the front panel, and the determination was made based on the difference as follows.
A: less than 10nm, and less than 10nm,
b: more than 10nm and less than 50nm,
c: more than 50nm and less than 200nm,
d: over 200 nm.
[ measurement of optical Density ]
The optical laminates of examples 1 to 3 and comparative example 1 were each cut into 5cm × 5cm so as to include the non-display region Y, thereby preparing a measurement sample for optical density measurement. The measurement sample was set on an optical density measuring instrument (product name: 361T, manufactured by X-Rite Co., Ltd.) with the front panel facing upward, and the optical density was measured while focusing on the non-display part B of the measurement sample.
[ Table 1]
Description of the symbols
10 front panel, 20 first laminating layer, 21 second laminating layer, 30 back panel, 40 coloring layer, 50 shielding layer, 60a, 60b, 60c polarizing plate, 70 touch sensor panel, 81 liquid crystal display unit, 82 organic EL display unit, 90 backlight unit, 100', 101, 102, 103, 104 optical laminate, 200 display laminate, 300 image display device, 301, 302 liquid crystal display device, 303, 304 organic EL display device, 305, 306 flexible display.
Claims (9)
1. An optical laminate comprising a front plate, a bonding layer, and a back plate in this order from a viewing side to a display side, the optical laminate further comprising:
a colored layer provided on a part of a surface of the front panel on the display side, and
a shielding layer provided on a part of a surface of the back panel on the display side;
the colored layer and the shielding layer overlap each other in at least a partial region in a plane direction orthogonal to the lamination direction.
2. The optical stack according to claim 1, wherein said blocking layer comprises a black pigment.
3. The optical stack according to claim 1 or 2, wherein the optical stack is divided into a display region and a non-display region in a plane direction orthogonal to the stacking direction,
the optical density of the non-display region is 3 or more.
4. The optical stack according to claim 3, wherein the blocking layer is disposed in the non-display region.
5. The optical stack according to any one of claims 1 to 4, wherein the front sheet is a resin film.
6. The optical stack of any of claims 1-5, wherein the back panel comprises a polarizer.
7. An image display device comprising the optical laminate according to any one of claims 1 to 6, wherein the front panel is disposed on the front surface.
8. A method for producing an optical laminate according to any one of claims 1 to 6, comprising:
forming the colored layer on a part of a surface of the front panel on the display side to obtain a front panel with a colored layer;
forming the shielding layer on a part of a surface of the rear panel on the display side to obtain a rear panel with a shielding layer;
and a step of laminating the front plate with the colored layer, the adhesive layer, and the back plate with the shielding layer to obtain the optical laminate.
9. A method for producing an optical laminate according to any one of claims 1 to 6, comprising:
forming the colored layer on a part of a surface of the front panel on the display side to obtain a front panel with a colored layer;
a step of laminating the colored layer-attached front sheet, the adhesive layer, and the back sheet to obtain an optical laminate precursor;
and a step of forming the shielding layer on a part of the display-side surface of the back plate of the optical laminate precursor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019133692A JP2021018321A (en) | 2019-07-19 | 2019-07-19 | Optical laminate and manufacturing method thereof |
| JP2019-133692 | 2019-07-19 | ||
| PCT/JP2020/022502 WO2021014801A1 (en) | 2019-07-19 | 2020-06-08 | Optical laminate and production method for same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114127590A true CN114127590A (en) | 2022-03-01 |
Family
ID=74193365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080051283.6A Pending CN114127590A (en) | 2019-07-19 | 2020-06-08 | Optical laminate and method for producing same |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2021018321A (en) |
| KR (1) | KR20220034734A (en) |
| CN (1) | CN114127590A (en) |
| TW (1) | TW202105013A (en) |
| WO (1) | WO2021014801A1 (en) |
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| JP2008083263A (en) * | 2006-09-26 | 2008-04-10 | Nissha Printing Co Ltd | Protective plate for portable display device |
| JP2013086466A (en) * | 2011-10-21 | 2013-05-13 | Asahi Glass Co Ltd | Front plate and method of manufacturing the same |
| US20140234594A1 (en) * | 2011-10-20 | 2014-08-21 | Nissha Printing Co., Ltd. | Decorative film for display device and protective panel |
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| KR20110107546A (en) * | 2010-03-25 | 2011-10-04 | 삼성코닝정밀소재 주식회사 | Display filter and digital information display containing the same |
| JP6310647B2 (en) | 2013-06-10 | 2018-04-11 | 日東電工株式会社 | Optical member and image display device |
| JP6275861B2 (en) * | 2014-09-29 | 2018-02-07 | 富士フイルム株式会社 | Laminated body, conductive laminated body and manufacturing method thereof, touch panel sensor, touch panel, transfer film |
| JP6580315B2 (en) * | 2014-10-15 | 2019-09-25 | 日東電工株式会社 | Optical film with double-sided pressure-sensitive adhesive, method for producing image display device using the same, and curl suppression method for optical film with double-sided pressure-sensitive adhesive |
| JP6580153B2 (en) * | 2015-10-26 | 2019-09-25 | 富士フイルム株式会社 | Film sensor manufacturing method, front plate integrated sensor manufacturing method, and image display device manufacturing method |
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2019
- 2019-07-19 JP JP2019133692A patent/JP2021018321A/en active Pending
-
2020
- 2020-06-08 KR KR1020217041688A patent/KR20220034734A/en unknown
- 2020-06-08 WO PCT/JP2020/022502 patent/WO2021014801A1/en active Application Filing
- 2020-06-08 CN CN202080051283.6A patent/CN114127590A/en active Pending
- 2020-06-15 TW TW109120038A patent/TW202105013A/en unknown
Patent Citations (7)
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| JP2008083263A (en) * | 2006-09-26 | 2008-04-10 | Nissha Printing Co Ltd | Protective plate for portable display device |
| US20140234594A1 (en) * | 2011-10-20 | 2014-08-21 | Nissha Printing Co., Ltd. | Decorative film for display device and protective panel |
| JP2013086466A (en) * | 2011-10-21 | 2013-05-13 | Asahi Glass Co Ltd | Front plate and method of manufacturing the same |
| US20160026039A1 (en) * | 2013-01-16 | 2016-01-28 | Sharp Kabushiki Kaisha | Mirror display, half mirror plate, and electronic device |
| JP2016065928A (en) * | 2014-09-24 | 2016-04-28 | 日東電工株式会社 | Optical member and image display device |
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| CN107664788A (en) * | 2016-07-29 | 2018-02-06 | 住友化学株式会社 | Optical laminate |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021014801A1 (en) | 2021-01-28 |
| KR20220034734A (en) | 2022-03-18 |
| JP2021018321A (en) | 2021-02-15 |
| TW202105013A (en) | 2021-02-01 |
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