CN110843266A - Composite front panel and method of manufacturing the same - Google Patents
Composite front panel and method of manufacturing the same Download PDFInfo
- Publication number
- CN110843266A CN110843266A CN201910738834.5A CN201910738834A CN110843266A CN 110843266 A CN110843266 A CN 110843266A CN 201910738834 A CN201910738834 A CN 201910738834A CN 110843266 A CN110843266 A CN 110843266A
- Authority
- CN
- China
- Prior art keywords
- layer
- front panel
- composite front
- thickness
- resin layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
- B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
- B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
- B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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- Electroluminescent Light Sources (AREA)
Abstract
The invention relates to a composite front panel and a method of manufacturing the same. The invention provides a novel composite front panel, which has flexibility and is provided with a coloring layer on the display side surface. A composite front panel used by being disposed on the front surface side of an image display device includes a 1 st resin layer and a coloring layer provided locally, a viewing-side surface is a plane constituted by a viewing-side surface of the 1 st resin layer, and a display-side surface is a plane constituted by a display-side surface of the 1 st resin layer and a display-side surface of the coloring layer.
Description
Technical Field
The present invention relates to a composite front panel and a method for manufacturing the same, and further relates to an optical laminate and an image display device.
Background
As various image display devices such as a liquid crystal display device and an organic electroluminescence display device, a configuration is known in which a front panel is provided on a viewing side of a display panel for the purpose of protecting the display panel. When the display panel is a touch panel, the front panel can also function as a touch surface.
Japanese patent application laid-open No. 2014-238533 (patent document 1) describes that a printed layer is provided as a colored layer on a peripheral edge portion of a display side surface (a surface on the opposite side to the viewing side surface) of a front panel provided on the viewing side of a display panel of an image display device. It is described that with such a configuration, an image display device without using a frame (bezel) can be realized.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-238533
Disclosure of Invention
Problems to be solved by the invention
In recent years, there has been an increasing demand for flexible image display devices. The flexible image display device can be provided on a surface other than a flat surface or a folded surface, and can be folded or formed into a roll shape when carried, thereby improving portability.
Patent document 1 describes that a flexible resin film can be used as the front panel. That is, a composite front panel in which a colored layer is provided on the display-side surface of a resin film is disclosed.
The invention aims to provide a novel composite front panel and a manufacturing method thereof, wherein the composite front panel has flexibility and is provided with a coloring layer on the display side surface. Specifically, an object is to provide a composite front panel that is less likely to generate air bubbles when the composite front panel is bonded to another member.
Means for solving the problems
The invention provides a composite front panel, an optical laminate, an image display device, and a method for manufacturing the composite front panel.
[ 1] composite front panel used by being disposed on the front surface side of an image display device,
the composite front panel comprises a 1 st resin layer and a coloring layer provided locally,
the viewing-side surface is a plane constituted by the viewing-side surface of the aforementioned 1 st resin layer,
the display side surface is a plane constituted by the display side surface of the aforementioned 1 st resin layer and the display side surface of the aforementioned colored layer.
[ 2] the composite front panel according to [ 1], wherein the colored layer contains a binder resin.
[ 3] the composite front panel according to [ 1] or [ 2], wherein the thickness ratio T1 (%) calculated from the following formula (1) satisfies the relationship of the following formula (2a) when the thickness of the 1 st resin layer is a (μm) and the thickness of the colored layer is b (μm).
T1＝b/a×100 (1)
5≤T1≤42 (2a)
[ 4] an optical laminate comprising: the composite front panel according to any one of [ 1] to [ 3 ]; and a shielding layer laminated on the display side surface of the composite front panel at a position corresponding to the colored layer.
[ 5] the optical laminate according to [ 4], wherein the thickness of the shielding layer is 12 μm or less.
[ 6] the optical laminate according to [ 4] or [ 5], wherein a thickness ratio T2 (%) calculated from the following formula (3) satisfies the following formula (4a) when the thickness of the 1 st resin layer is a (μm), the thickness of the colored layer is b (μm), and the thickness of the shielding layer is c (μm).
T2＝(b+c)/a×100 (3)
T2≥30 (4a)
[ 7] an optical laminate comprising:
the composite front panel according to any one of [ 1] to [ 3 ]; and
at least one of a 2 nd resin layer laminated on the viewing side surface of the composite front panel and a 3 rd resin layer laminated on the display side surface of the composite front panel.
[ 8] the optical laminate according to [ 7], which comprises the 3 rd resin layer laminated on the display-side surface of the composite front plate via an adhesive layer,
the thickness of the adhesive layer is 2 to 25 μm.
An image display device according to any one of [ 1] to [ 3] which is disposed on a front surface side.
The method for manufacturing a composite front panel according to any one of [ 10] to [ 1] to [ 3], comprising:
a step of forming the colored layer locally on the base film;
a step of forming the 1 st resin layer by applying a resin layer forming composition on the base film so as to cover the viewing side surface of the colored layer and drying the composition; and
and a step of peeling off the base film.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a novel composite front panel having flexibility and a colored layer on the display-side surface can be provided. Specifically, the present invention can provide a composite front panel that is less likely to generate air bubbles when the composite front panel is bonded to another member.
Drawings
FIG. 1 is a schematic cross-sectional view showing one embodiment of a composite front panel according to the present invention.
FIG. 2 is a schematic cross-sectional view showing an example of a method for manufacturing a composite front panel.
FIG. 3 is a schematic cross-sectional view showing embodiment 1 of the optical laminate of the present invention.
FIG. 4 is a schematic cross-sectional view showing embodiment 2 of the optical laminate of the present invention.
FIG. 5 is a schematic cross-sectional view showing embodiment 3 of the optical laminate of the present invention.
Fig. 6 is a schematic cross-sectional view showing an example of the image display device 300.
Fig. 7 is a top view of the image display device 300 viewed from the viewing side.
Fig. 8 shows an example of a curved form when the image display device is a flexible display.
Fig. 9 is a schematic cross-sectional view showing an image display device 1 according to an embodiment of the present invention.
Fig. 10 is a schematic cross-sectional view showing an image display device according to embodiment 2 of the present invention.
FIG. 11 is a schematic cross-sectional view showing an image display device 3 according to an embodiment of the present invention.
FIG. 12 is a schematic cross-sectional view showing an image display device according to embodiment 4 of the present invention.
FIG. 13 is a schematic cross-sectional view showing an example of an optical laminate having a shielding layer according to the present invention.
Fig. 14 is a schematic cross-sectional view showing a modification of the optical laminate according to embodiment 1.
Fig. 15 is a schematic cross-sectional view showing a modification of the optical laminate according to embodiment 2.
Fig. 16 is a schematic cross-sectional view showing a modification of the optical laminate according to embodiment 3.
Description of the reference numerals
10 1 st resin layer, 20 colored layer, 25 shielding layer, 30 nd 2 nd resin layer, 40 rd 3 rd resin layer, 50, 51 laminating layer, 60a, 60B, 60c polarizing plate, 70 touch sensor panel, 81 liquid crystal display unit, 82 organic EL display unit, 90 backlight unit, 100 composite front panel, 100' composite front panel sheet, 100a viewing side surface, 100B display side surface, 110 base material film, 201, 202, 203 optical laminate, 300 image display device, 301, 302 liquid crystal display device, 303, 304 organic EL display device, 305, 306 flexible display, 400 display laminate, 501, 502, 503 optical laminate, a display region, B non-display region.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings below, the scale of each component shown in the drawings is appropriately adjusted to facilitate understanding of each component, and the scale of each component does not necessarily coincide with the scale of the actual component. The same reference numerals denote the same components, and unless otherwise specified, the description of the components with the same reference numerals is common.
[ composite front Panel ]
< constitution >
Fig. 1 is a schematic cross-sectional view showing one embodiment of a composite front panel according to the present invention. The composite front panel 100 shown in fig. 1 includes a 1 st resin layer 10 and a colored layer 20 provided locally. The composite front panel 100 has a display region a and a non-display region B, and the colored layer 20 is provided in a region corresponding to the non-display region B.
The viewing-side surface 100a of the composite front panel 100 is a plane constituted by the viewing-side surface 10a of the 1 st resin layer 10. The display-side surface 100b of the composite front panel 100 is a plane constituted by the display-side surface 10b of the resin layer 10 and the display-side surface 20b of the colored layer 20.
The composite front panel 100 may be a front panel having a function of protecting the front surface of the image display device, and also having a function as a touch sensor, a blue light blocking function, a viewing angle adjusting function, and the like.
The thickness of the composite front panel 100 is, for example, 20 μm or more and 1000 μm or less, preferably 30 μm or more and 500 μm or less, and preferably 30 μm or more and 100 μm or less. The thickness of the colored layer 20 is, for example, 80% or less, 60% or less, or 50% or less of the thickness of the composite front panel 100.
In the composite front panel 100, when the thickness of the 1 st resin layer 10 is a (μm) and the thickness of the colored layer 20 is b (μm), the thickness ratio T1 (%) calculated by the following expression (1) preferably satisfies the relationship of the following expression (2 a). The thickness of the 1 st resin layer 10 refers to the thickness of the thickest part of the 1 st resin layer 10, and thus coincides with the thickness of the composite front panel 100.
T1＝b/a×100 (1)
5≤T1≤42 (2a)
If the thickness ratio T1 exceeds 42%, it may be difficult to maintain the flatness of the viewing-side surface of the composite front panel 100, and a concave step may occur in the display region a on the viewing-side surface. If the thickness ratio T1 is less than 5%, it may be difficult to obtain a sufficient optical density. The thickness ratio T1 preferably satisfies the relationship of the following expression (2 b).
7.5≤T1≤30 (2b)
Although the composite front panel 100 includes the colored layer 20 exposed on the display side surface 100b, the display side surface 100b is formed in a flat surface, and therefore, damage to the colored layer 20 can be suppressed. Further, by making the display-side surface 100b flat, it is possible to suppress the mixing of air bubbles generated by a difference in level between the colored layer and the resin layer when bonding with another layer.
< production method >
Fig. 2(a) to (d) are schematic sectional views showing an example of a method for manufacturing the composite front panel 100. First, a base film 110 is prepared (fig. 2a), and a colored layer 20 is formed in a local region on the base film 110 (fig. 2 b). Next, a resin layer forming composition is applied so as to cover the viewing side surface 20a of the color layer 20, and the resin layer forming composition is dried or cured, thereby forming a resin layer 10 (fig. 2 (c)). Next, the base film 110 is peeled off to expose the display-side surface 20b of the colored layer 20 and the display-side surface 10b of the resin layer 10, thereby obtaining a composite front sheet 100' (fig. 2 (d)). Next, the composite front panel sheet 100' is cut as necessary, and unnecessary portions are cut away to obtain the composite front panel 100.
The base film 110 is not particularly limited as long as it is not deformed during the formation of the colored layer 20 and the resin layer 10 and can be separated from the composite front sheet 100'. As a material for forming the base film 110, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture blocking property, isotropy, stretchability, and the like can be used.
Examples of such thermoplastic resins include polyolefin resins such as chain polyolefin resins and cyclic polyolefin resins (norbornene resins), polyester resins, (meth) acrylic resins, cellulose ester resins such as cellulose triacetate and cellulose diacetate, polycarbonate resins, polyvinyl alcohol resins, polyvinyl acetate resins, polyarylate resins, polystyrene resins, polyether sulfone resins, polysulfone resins, polyamide resins, polyimide resins, and mixtures thereof. In addition, a copolymer obtained by copolymerizing monomers of the above resin may be used as a material for forming the base film. Among these, polyolefin resins such as polypropylene and polyester resins such as amorphous polyethylene terephthalate are preferable.
The thickness of the base film 110 is preferably 1 to 500. mu.m, more preferably 1 to 300. mu.m, still more preferably 5 to 200. mu.m, and particularly preferably 5 to 150. mu.m, from the viewpoint of strength and handling properties.
(colored layer)
The shape and color of the colored layer 20 are not limited, and can be appropriately selected according to the application and design. Examples of the colored layer 20 include a layer colored in black, red, white, navy blue, silver, gold, or the like. The colored layer 20 may be formed of a single layer or a plurality of layers. When the colored layer 20 is formed of a plurality of layers, one color or a plurality of colors may be used as the color of the colored layer 20.
When the colored layer 20 is an organic layer containing a binder resin or the like, the thickness is likely to be thicker than that of an inorganic layer containing a metal layer in order to achieve a certain optical density. When the coloring layer is thick, a level difference is easily generated on the viewing-side surface of the resin layer. According to one embodiment of the present invention, even when the colored layer is formed of an organic layer, the height difference can be reduced by controlling the thickness ratio.
The colored layer 20 can be formed on the base film by a printing method using ink or paint, a vapor deposition method using powder of a metallic pigment, a method of forming a colored layer 20 containing a metallic pigment in advance and bonding the same, or the like. In addition, these methods may be combined. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by a printing method may be repeated to obtain a colored layer 20 having a desired thickness. The ink or paint for forming the colored layer 20 contains, for example, a binder resin, a colorant, a solvent, and an optional additive.
Examples of the binder resin 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 2 or more kinds may be used in combination. The binder resin may be a thermally polymerizable resin or a photopolymerizable resin. When the colored layer contains a binder resin, the colored layer 20 can contribute to improvement in adhesion to the resin layer 10.
The colorant may be appropriately selected depending on the desired coloring. Examples of the colorant include inorganic pigments such as titanium white, zinc oxide, carbon black, iron black, red iron oxide, molybdenum chrome red (chrome), ultramarine blue, cobalt blue, chrome yellow, and titanium yellow; organic pigments or dyes such as phthalocyanine blue, indanthrene blue (indhrome blue), isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red (polyazoled), pyrene red, aniline black, and the like; metallic pigments made of scaly foils of aluminum, brass, and the like; a pearl lustre pigment (pearl pigment) formed of a scaly foil such as mica or basic lead carbonate coated with titanium dioxide. The colorant is preferably contained in an amount of 50 to 200 parts by mass with respect to 100 parts by mass of the binder resin.
The thickness of the colored layer 20 is not particularly limited as long as it is not exposed on the viewing-side surface 100a of the composite front panel 100. From the viewpoint of enhancing the shielding effect of the colored layer 20, the thickness is preferably 1 μm to 50 μm, more preferably 3 μm to 30 μm, and may be 3 μm to 20 μm. When the colored layer 20 is black, a higher shading effect can be obtained than other colors even if the colored layer is thin.
The colored layer 20 preferably has an optical density of 2.0 or more, and more preferably 2.5 or more, as measured by the method described in the examples described later.
The viewing side surface 20a of the colored layer 20 is not limited to the shape substantially parallel to the display side surface 20b as shown in fig. 1. In order to provide design, the inclined surface or the serrated surface may be formed. In addition, from the viewpoint of improving the bondability to the resin layer 10, the surface may be roughened.
The colored layer is preferably a layer that does not dissolve or swell due to the solvent contained in the resin layer-forming composition.
When the colored layer 20 is provided on the peripheral edge portion of the composite front panel 100, the colored layer is not limited to the embodiment of being provided on the entire periphery of the peripheral edge portion, and may be provided only on a part of the peripheral edge portion depending on a desired design or the like. The width of the colored layer 20 can be appropriately determined depending on the size of the display area, desired design, and the like, and can be, for example, in the range of 1mm to 20 mm.
(1 st resin layer)
The polymer material contained in the 1 st resin layer 10 is not particularly limited as long as it transmits light. For example, the resin composition may contain 1 or 2 or more kinds of polymer materials alone among polymer materials such as triacetylcellulose, acetylcellulose butyrate (acetylcellulose butyrate), ethylene-vinyl acetate copolymer, propionylcellulose, butyrylcellulose, acetylpropionylcellulose, polyester, polystyrene, polyamide, polyetherimide, polyacrylic polymer (polyacrylic), polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinylacetal, polyetherketone, polyetheretherketone, polyethersulfone, polymethylmethacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyamideimide, and the like. Among them, a resin layer containing a polymer material such as polyimide, polyamide, polyamideimide or the like, which can constitute a resin layer having excellent flexibility and high strength and high transparency, is preferable.
The resin layer-forming composition contains a precursor of a polymer material or a polymer material, and a solvent capable of dissolving or dispersing the precursor or the polymer material. The solvent is preferably selected so as not to swell or dissolve the colored layer. From such a viewpoint, examples of the solvent include N, N-dimethylacetamide (DMAc), N-Dimethylformamide (DMF), dimethyl sulfoxide (DMSO), γ -butyrolactone (GBL), N-methylpyrrolidone (NMP), ethyl acetate, Methyl Ethyl Ketone (MEK), tetrahydrofuran, 1, 4-dioxane, acetone, cyclopentanone, dimethyl sulfoxide, xylene, and a combination thereof. The resin layer-forming composition may contain additives known in the art, such as a polymerization initiator, a polymerization initiation aid, a leveling agent, an antioxidant, and a light stabilizer, as necessary.
The coating method of the resin-forming composition can be performed by a conventionally known coating method. Examples of the conventionally known coating method include a roll coating method such as a wire bar coating method, a reverse coating method, and a gravure coating method, a die coating method, a comma coating method, a lip coating method, a screen coating method, a fountain coating method, a dip coating method, and a spray coating method.
[ optical layered body ]
One embodiment of the optical laminate of the present invention includes: the composite front panel 100 described above; and a shielding layer laminated on the display-side surface of the composite front panel at a position corresponding to the colored layer 20.
Fig. 13 is a cross-sectional view showing an example of an optical laminate having a shielding layer. The optical laminate 501 shown in fig. 13 has the composite front panel 100 shown in fig. 1, and further has a shielding layer 25 laminated on the display-side surface 100b thereof at a position corresponding to the colored layer 20. By having the shielding layer 25, the optical density of the non-display region B can be increased. The optical density of the non-display region B having the shielding layer 25 is preferably 3.0 or more.
The thickness of the shielding layer 25 is preferably 12 μm or less, and more preferably 6 μm or less, in order to suppress the incorporation of bubbles due to the protrusion of the shielding layer 25 from the display-side surface of the composite front panel 100 when the shielding layer is bonded to another layer. The thickness of the shielding layer 25 may be 1 μm or more, for example.
In the optical laminate having the shielding layer 25, when the thickness of the 1 st resin layer 10 is a (μm), the thickness of the colored layer 20 is B (μm), and the thickness of the shielding layer 25 is c (μm), the thickness ratio T2 (%) calculated by the following formula (3) preferably satisfies the relationship of the following formula (4a) from the viewpoint of increasing the optical density of the non-display region B.
T2＝(b+c)/a×100 (3)
T2≥30 (4a)
In the optical laminate configured by using the composite front panel satisfying the following formula (2c), the above formula (4a) is necessarily satisfied, but even when the following formula (2c) is not satisfied and the following formula (2d) is satisfied, the optical laminate satisfying the above formula (4a) can be configured by adjusting the thickness of the shielding layer 25. One preferable embodiment of the optical laminate having the shielding layer 25 includes an optical laminate having the composite front panel 100 satisfying the following formula (2d) and the shielding layer 25 and satisfying the above formula (4 a).
T1≥30 (2c)
T1＜30 (2d)
In the optical laminate having the shielding layer 25, the thickness ratio T2 (%) preferably satisfies the relationship of the following formula (4 b).
T2≤50 (4b)
One embodiment of the optical laminate of the present invention includes, in addition to the composite front panel 100 described above, at least one of a 2 nd resin layer laminated on the viewing-side surface 100a of the composite front panel 100 and a 3 rd resin layer laminated on the display-side surface 100b of the composite front panel 100. The 2 nd resin layer is, for example, a hard coat layer. The 3 rd resin layer is, for example, a hard coat layer, a protective film, or the like. The protective film may be laminated via a bonding layer.
< embodiment 1>
Fig. 3 is a schematic cross-sectional view showing embodiment 1 of the optical laminate of the present invention.
The optical laminate 201 shown in fig. 3 has the composite front panel 100, and also has the 2 nd resin layer 30 laminated on the viewing-side surface 100a thereof. Fig. 14 shows an optical laminate 502 as a modification of the optical laminate 201 according to embodiment 1. The optical stack 502 differs from the optical stack 201 only in that it has the shielding layer 25.
< embodiment 2>
Fig. 4 is a schematic cross-sectional view showing embodiment 2 of the optical laminate of the present invention.
The optical stack 202 shown in fig. 4 has the composite front panel 100, and has the adhesive layer 50 and the 3 rd resin layer 40 laminated on the display side surface 100b thereof. Fig. 15 shows an optical laminate 503 as a modification of the optical laminate 202 according to embodiment 2. The optical stack 503 differs from the optical stack 202 only in that it has the shielding layer 25.
< embodiment 3>
Fig. 5 is a schematic cross-sectional view showing embodiment 3 of the optical laminate of the present invention. The optical laminate 203 shown in fig. 5 has the composite front panel 100, and has the 2 nd resin layer 30 laminated on the viewing side surface 100a thereof, and the laminating layer 50 and the 3 rd resin layer 40 laminated on the display side surface 100b thereof. Fig. 16 shows an optical laminate 504 as a modification of the optical laminate 203 according to embodiment 3. The optical stack 504 differs from the optical stack 203 only in that it has the shielding layer 25.
(No. 2 resin layer)
The 2 nd resin layer 30 laminated on the viewing side surface 100a of the composite front panel 100 is, for example, a hard coat layer. In the case where the optical laminate is used, for example, on the front surface of a touch panel type image display device, the 2 nd resin layer 30 serves as a touch surface, and therefore, the 2 nd resin layer 30 having high hardness and scratch resistance is preferably used. 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. For the hard coating, additives may be included in order to improve strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof.
(3 rd resin layer)
The 3 rd resin layer 40 laminated on the display side surface 100b of the composite front panel 100 is, for example, a hard coat layer, a protective film, or the like. The 3 rd resin layer 40 is preferably a resin layer having high hardness and scratch resistance, from the viewpoint of preventing damage during transportation, storage, and the like. The hard coat layer can be applied to the description in the 2 nd resin layer.
As the protective film, those generally used in the art can be used. The material of the protective film is not particularly limited, and 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 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 30 μm or more, preferably 40 μm or more. The protective film may or may not have a phase difference.
(laminating layer)
The laminating layer 50 is a layer which is laminated between the composite front panel 100 and the 3 rd resin layer, and is an adhesive layer or an adhesive layer, and an adhesive layer can be preferably used.
Since the colored layer 20 is contained in the composite front panel 100, the adhesive layer 50 does not need to absorb the thickness of the colored layer 20, and can be made thin. The thickness of the adhesive layer is, for example, 2 to 100. mu.m, 2 to 25 μm, or 2 to 20 μm.
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, a pressure-sensitive adhesive composition containing a (meth) acrylic resin excellent in transparency, weather resistance, heat resistance and the like as a base polymer is preferable. The adhesive composition may be an active energy ray-curable type or a thermosetting type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer containing 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 as monomers can be preferably used. The base polymer is preferably copolymerized with a polar monomer. 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 comprise only the above-mentioned base polymer, but usually also 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 as a polyepoxy compound, a polyol, forming an ester bond between them and a carboxyl group; a crosslinking agent which is a polyisocyanate compound and forms an amide bond between the polyisocyanate compound and 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 an ultraviolet ray or an electron ray, and having a property of being capable of adhering to an adherend such as a film by having an adhesive property even before irradiation with an active energy ray, and being cured by irradiation with an active energy ray to adjust the adhesion force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The active energy ray-curable adhesive composition contains an active energy ray-polymerizable compound in addition to a base polymer and a crosslinking agent. Further, a photopolymerization initiator, a photosensitizer and the like may be contained as necessary.
The binder composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, adhesion-imparting agents, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosive agents, and photopolymerization initiators for imparting light scattering properties.
The adhesive composition can be formed by applying a diluted solution of the above adhesive composition in an organic solvent to a substrate and drying the applied solution. 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 pressure-sensitive adhesive layer thus formed with active energy rays.
(Shielding layer)
The shielding layer 25 is provided so as to correspond to the colored layer 20, and the width of the shielding layer 25 in the surface direction is preferably substantially the same as the width of the colored layer 20 in the surface direction. The masking layer 25 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 25 may be formed of a single layer or a plurality of layers.
The shielding layer 25 can be formed by a printing method, a coating method, or the like. The shielding layer 25 may be formed directly on the display-side surface of the composite front panel 100, or may be formed by transferring a shielding layer formed on another substrate to the display-side surface. The above description of the colored layer 20 can be applied to the printing method.
[ image display apparatus ]
An image display device of the present invention includes: the composite front panel 100 or the optical laminate described above disposed on the front surface; and a display laminate comprising the display panel. The composite front plate, the optical laminate, and the display laminate may be laminated via a bonding layer.
Fig. 6 is a schematic cross-sectional view showing an example of the image display device 300. The image display device 300 has the composite front panel 100 on the viewing side, and has the adhesive layer 51 and the display laminate 400 laminated on the display-side surface of the composite front panel 100. The adhesive layer 51 can be applied to the description of the adhesive layer 50 in the optical laminate described above.
Fig. 7 is a top view of the image display device 300 viewed from the viewing side. The colored layer 20 is visually recognized in the non-display region B of the peripheral portion. The colored layer 20 can shield the wiring and the like disposed in the non-display region B. The colored layer 20 may be provided so as to correspond to the non-display region B, and the arrangement position in the plane is not limited, but the colored layer is arranged at the peripheral edge portion, whereby light leakage can be suppressed, and the colored layer is visually recognized like a frame, so that design can be improved.
The shape and size of the composite front panel 100 in the image display device 300 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 composite front panel 100 has a square shape, at least one of the R-process, the notch process, and the punching process may be performed.
The image display device 300 may be constructed in the form of a flexible display panel. Fig. 8 shows an example of a curved form when the image display device is a flexible display. Fig. 8(a) shows a flexible display 305 configured to be foldable with the viewing-side surface as the inner side, and fig. 8(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 a composite front panel 100 provided on a front surface constitutes a touch surface. In the touch sensor panel type image display device, a hard coat layer is preferably laminated on the viewing side surface of the composite front panel 100.
< embodiment 1>
Fig. 9 is a schematic cross-sectional view showing an image display device 1 according to an 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, the composite front panel 100, the adhesive layer 51, the polarizing plate 60a, the touch sensor panel 70, the liquid crystal display element unit 81, the polarizing plate 60b, and the backlight unit 90. The liquid crystal display device 301 has a display region a and a non-display region B, and has a colored layer 20 corresponding to the non-display region B in the composite front panel 100.
< embodiment 2>
Fig. 10 is a schematic cross-sectional view showing an image display device according to embodiment 2 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 is different from the liquid crystal display device 301 shown in fig. 9 only in that the lamination position of the polarizing plate 60a and the touch sensor panel 70 is switched.
< embodiment 3>
Fig. 11 is a schematic cross-sectional view showing an image display device according to embodiment 3 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 the composite front panel 100, the adhesive layer 51, the polarizing plate 60c, the touch sensor panel 70, and the organic EL unit 82 in this order from the viewing side. The organic EL display device 303 has a display region a and a non-display region B, and has a colored layer 20 corresponding to the non-display region in the composite front panel 100.
< embodiment 4>
Fig. 12 is a schematic cross-sectional view showing an image display device according to embodiment 4 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 is different from the organic EL display device 303 shown in fig. 11 only in that the lamination position of the polarizing plate 60c and the touch sensor panel 70 is switched.
(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 type 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.
(polarizing plate)
Examples of the polarizing plate include a stretched film in which a dye having absorption anisotropy is adsorbed, a film including a polarizer obtained by coating and curing a dye having absorption anisotropy, and the like. Examples of the dye having absorption anisotropy include dichroic dyes. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. The dichroic organic dye includes a dichroic direct dye formed of a disazo compound such as c.i. direct red (DIRECT RED)39, and a dichroic direct dye formed of a compound such as a trisazo compound or a tetrazo compound. Examples of the film to be used as a polarizer, to which a dye having absorption anisotropy is applied, include a stretched film to which a dye having absorption anisotropy is adsorbed, and a film having a layer obtained by applying a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal and curing the composition. A film obtained by applying and curing a dye having absorption anisotropy is preferable to a stretched film having an absorbed dye having absorption anisotropy because there is no limitation in the bending direction.
The polarizing plate may include a retardation film and a brightness enhancement film depending on the kind of the image display device. When applied to an organic EL display device, the polarizing plate may be a circular polarizing plate having a film formed of a λ/4 plate and a positive C plate, or a film formed of a λ/4 plate and a λ/2 plate as a retardation film. The retardation film may be formed of a material for forming a protective film described later or a composition containing a polymerizable liquid crystal compound.
(1) Polarizing plate having stretched film as polarizer
A polarizing plate having a polarizing plate as a polarizer, the polarizing plate being a stretched film having a dye having absorption anisotropy adsorbed thereon, will be described. A stretched film as a polarizer, to which a dye having absorption anisotropy is adsorbed, is generally produced through the following steps: a step of uniaxially stretching a polyvinyl alcohol resin film; a step of dyeing a polyvinyl alcohol resin film with a dichroic dye to thereby adsorb the dichroic dye; and a step of treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution; and a step of washing with water after the treatment with the boric acid aqueous solution. Such a polarizer may be used as it is as a polarizing plate, or a product obtained by laminating a transparent protective film on one or both surfaces thereof may be used as a polarizing plate. The thickness of the polarizer obtained in the above manner 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 may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic 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 1,000 to 10,000, and preferably 1,500 to 5,000.
The film obtained by forming such a polyvinyl alcohol resin film can be used as a blank film for a polarizing plate. The method for forming the polyvinyl alcohol resin film is not particularly limited, and a known method can be used for forming the film. The thickness of the polyvinyl alcohol base film may be, for example, about 10 μm to 150 μm.
The uniaxial stretching of the polyvinyl alcohol-based resin film may be performed before, simultaneously with, or after the dyeing with the dichroic dye. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before or during the boric acid treatment. In addition, the uniaxial stretching may be performed in the above-described plurality of stages. In the case of uniaxial stretching, the stretching may be carried out uniaxially between rolls having different peripheral speeds, or may be carried out uniaxially using a hot 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 attached to one surface or both surfaces of the polarizer is not particularly limited, and examples thereof include films known in the art, such as a cyclic polyolefin resin film, an 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 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 formed 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 a film used as a polarizer and coated with a dye having absorption anisotropy include a film obtained by applying a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound to a substrate and curing the composition. The film may be used as a polarizing plate after peeling off the substrate or together with the substrate, or may be used as a polarizing plate having a protective film on one or both surfaces thereof. Examples of the protective film include those similar to the polarizing plate having the stretched film as the polarizer.
A thinner film obtained by applying and curing a dye having absorption anisotropy is preferable, but if it is too thin, the strength tends to be lowered and the processability tends to be deteriorated. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less.
Specific examples of the film coated with the dye having absorption anisotropy include films described in japanese patent application laid-open nos. 2013-37353 and 2013-33249.
(touch sensor panel)
The touch sensor panel is not limited to any 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 touch sensor panel of a resistive film type or a capacitive coupling type is preferably used.
An example of a resistive touch sensor panel includes a pair of substrates arranged to face each other, an insulating spacer interposed between the pair of substrates, a transparent conductive film provided as a resistive film on an 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 surface of the composite front panel 100 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, thereby detecting 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 surface of the composite front panel 100 is touched, the transparent electrode is grounded at the touched point via the capacitance of the human body. The touch position detection circuit detects the grounding of the transparent electrode, thereby detecting the touched position.
[ use of image display device ]
The image display device according to the present invention can be used as a mobile device such as a smart phone or a tablet computer, a television, a digital photo frame, an electronic billboard, a measuring instrument, an office device, a medical device, a computer device, or the like. The bending direction of the image display device may be bending with the composite front panel 100 as the inner side, or bending with the composite front panel 100 as the outer side. According to the present invention, the degree of freedom in design is increased as compared with the case where the colored layer 20 is disposed so as to protrude from the surface of the composite front panel 100, and air biting during lamination can be prevented.
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 ingredients >
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 an aliphatic polyisocyanate
25% by mass of ethyl acetate
< solvent >
Isophorone
< preparation 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 colorant layer-containing composition (black color).
[ preparation of composition for Forming protective layer (transparent) ]
< ink ingredients >
90% 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 an aliphatic polyisocyanate
25% by mass of ethyl acetate
< solvent >
Isophorone
< preparation 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.
[ preparation of adhesive layer ]
A (meth) acrylic pressure-sensitive adhesive layer (thickness: 25 μm) was prepared.
[ preparation of resin composition for Forming the 2 nd resin layer ]
An ultraviolet-curable acrylic resin composition was prepared.
[ preparation of the 3 rd resin layer ]
A TAC film (thickness 25 μm) was prepared.
[ examples 1 to 5]
< example 1>
(preparation of composite front Panel)
The composite front panel of example 1 was produced according to the steps shown in fig. 2(a) to (d). Specifically, a PET film (125 μm thick, RF series manufactured by SKC HASS) having a size of 210cm × 279cm was prepared as the base film 110. On the surface of the base film 110, printing was performed 2 times with a coating thickness after drying being a discharge amount of 6 μm by screen printing using the colorant-containing layer forming composition (black) prepared above as an ink, using a 460-mesh screen, and then printing was performed 1 time with a coating thickness after drying being a discharge amount of 3 μm. In this manner, the colored layer 20 formed of a black printed layer 15 μm thick and 25mm wide was formed over the entire periphery of the peripheral edge portion (fig. 2 (b)).
The surface of the base film 110 on which the colored layer 20 was formed was coated with a resin composition (containing a polyimide resin) for forming the 1 st resin layer so that the thickness after drying was 50 μm, and was prebaked at 80 ℃ for 30 minutes. Thereafter, the base film 110 was peeled off to expose the display-side surface 20b of the colored layer 20 and the display-side surface 10b of the resin layer 10, and post-baked at 200 ℃ for 30 minutes to obtain a composite front panel 100 (fig. 2 (d)).
< example 2>
The composite front panel of example 2 was produced, which is different from the composite front panel 100 produced in example 1 only in that the thickness of the colored layer 20 after drying was 18 μm and the thickness of the 1 st resin layer after drying was 70 μm. In example 1, the colored layer 20 was formed in a step of printing 2 times with a discharge amount of 6 μm in the coating thickness after drying and then printing 1 time with a discharge amount of 3 μm in the coating thickness after drying, and in example 2, printing 3 times with a discharge amount of 6 μm in the coating thickness after drying was performed.
< example 3>
The composite front panel of example 3 was produced, which is different from the composite front panel 100 produced in example 1 only in that the thickness of the colored layer 20 after drying was 3 μm and the thickness of the 1 st resin layer after drying was 40 μm. In example 1, the colored layer 20 was formed in a step of printing 2 times with a discharge amount of 6 μm in the coating thickness after drying and then printing 1 time with a discharge amount of 3 μm in the coating thickness after drying, and in example 3, only printing 1 time with a discharge amount of 3 μm in the coating thickness after drying was performed.
< example 4>
The composite front panel of example 4 was produced, which is different from the composite front panel 100 produced in example 1 only in that the thickness of the colored layer 20 after drying was 2.5 μm. In example 1, the colored layer 20 was formed in a step of printing 2 times with a discharge amount of 6 μm in the coating thickness after drying and then printing 1 time with a discharge amount of 3 μm in the coating thickness after drying, and in example 4, only printing 1 time with a discharge amount of 2.5 μm in the coating thickness after drying was performed.
< example 5>
The composite front panel of example 5 was produced, which is different from the composite front panel 100 produced in example 1 only in that the thickness of the colored layer 20 after drying was 21 μm. In example 1, the step of printing 2 times with the discharge amount of the coating thickness after drying to 6 μm and then printing 1 time with the discharge amount of the coating thickness after drying to 3 μm was performed, and in example 5, the step of printing 3 times with the discharge amount of the coating thickness after drying to 6 μm and then printing 1 time with the discharge amount of the coating thickness after drying to 3 μm was performed.
[ evaluation ]
< air bubbles during bonding >
The display-side surfaces of the composite front panels of examples 1 to 5 were in the same horizontal plane, and therefore, no air bubbles were generated when they were bonded to other members via the adhesive layer.
< difference in level of concavity of viewing-side surface >
The composite front panels of examples 1 to 5 were observed on the viewing side surface with an interferometer microscope (Bruker GT), and the height of the difference in height between the display region and the non-display region in which the colored layer was formed (the difference between the maximum height and the minimum height) was measured. No difference in height was observed in the composite front panels of examples 1 to 4. That is, the height of the step is 0 (zero) μm. On the other hand, in the composite front panel of example 5, a step formed by the non-display region protruding from the display region was observed, and the height of the step was 4.6 μm. The evaluation results are shown in table 1.
< measurement of optical Density >
The composite front panels of examples 1 to 5 were each prepared by cutting out a region (non-display region) on which the colored layer 20 was formed in a size of 117mm × 154mm, and then prepared as a sample for measuring optical density. The sample was set in an optical density measuring instrument (product name: 361T, manufactured by X-rite Co., Ltd.), the light source on the upper part of the viewing side surface of the sample was turned on to focus on the colored layer of the sample, the light source on the upper part was turned off, the light source on the lower part of the display side surface of the sample was turned on, and the optical density was measured using the colored layer as a measurement region. The measurement results are shown in table 1.
[ Table 1]
[ test examples 1 to 6]
< test example 1>
(production of optical layered body)
The display side surface of the composite front panel of example 1 and the surface of the 3 rd resin layer on the side to be bonded were subjected to corona treatment. Then, the layers were laminated so as to become "composite front panel/pressure-sensitive adhesive layer/3 rd resin layer of example 1", laminated using a roll bonding machine, and cured in an autoclave, to obtain an optical laminate of test example 1 (the configuration thereof is the same as that of the optical laminate 202 shown in fig. 4).
< test example 2>
An optical laminate similar to the optical laminate 202 of test example 1 was produced, and then a resin composition for forming the 2 nd resin layer was applied to the viewing-side surface of the optical laminate 202 and cured by irradiation with ultraviolet rays to form a 2 nd resin layer having a thickness of 10 μm, thereby obtaining an optical laminate of test example 2 having a configuration similar to that of the optical laminate 203 shown in fig. 5 and formed of the "2 nd resin layer/the composite front panel/pressure-sensitive adhesive layer/3 rd resin layer of example 1".
< test example 3>
An optical laminate 501 having a configuration shown in fig. 13 was obtained by printing 1 time with a 460-mesh screen using a colorant-containing layer-forming composition (black) as an ink so that the ink has the same width as the colored layer 20 on the display-side surface of the composite front panel of example 1, and the coating thickness after drying was 3 μm in discharge amount by screen printing, and forming a shielding layer 25 formed of a black printed layer having a thickness of 3 μm and a width of 25mm over the entire circumference of the peripheral edge portion.
The surface of the obtained optical laminate 501 on the display side and the surface of the 3 rd resin layer on the side to be bonded were subjected to corona treatment. Then, the layers were laminated so as to be "optical laminate 501/pressure-sensitive adhesive layer/3 rd resin layer", and were bonded using a roll bonding machine, followed by curing in an autoclave, whereby optical laminate 503 shown in fig. 15 was obtained.
The resin composition for forming the 2 nd resin layer was applied to the viewing side surface of the obtained optical laminate 503 and cured by irradiation with ultraviolet rays to form the 2 nd resin layer having a thickness of 10 μm, thereby obtaining an optical laminate of test example 3 having a configuration similar to that of the optical laminate 504 shown in fig. 16 and including the "2 nd resin layer/optical laminate 501/pressure-sensitive adhesive layer/3 rd resin layer".
< test example 4>
A front panel different from the composite front panel 100 produced in example 1 only in that the colored layer 20 is not provided was produced. Specifically, without performing the step of forming the colored layer 20, the resin composition (containing a polyimide resin) for forming the 1 st resin layer was applied to the surface of the base film 110 so that the thickness after drying became 50 μm, and was prebaked at 80 ℃ for 30 minutes. Thereafter, the base film 110 was peeled off to expose the display side surface 10b of the resin layer 10, and post-baked at 200 ℃ for 30 minutes to obtain a front panel used in test example 4.
On the display side surface of the front panel, using a colorant-containing layer-forming composition (black) as an ink, printing was performed 2 times with a discharge amount of 6 μm after drying by screen printing using a 460-mesh screen, and then printing was performed 1 time with a discharge amount of 3 μm after drying, to form a shielding layer 25 formed of a black printed layer having a thickness of 15 μm and a width of 25mm over the entire circumference of the peripheral edge portion, thereby obtaining an optical laminate.
The surface of the obtained optical laminate on the display side and the surface of the 3 rd resin layer on the side to be bonded were subjected to corona treatment. Then, the layers were laminated so as to be "front panel (having shielding layer formed)/adhesive layer/3 rd resin layer", and were bonded using a roll bonding machine, followed by curing in an autoclave to obtain an optical laminate.
The resin composition for forming the 2 nd resin layer was applied to the viewing side surface of the obtained optical laminate, and cured by ultraviolet irradiation to form the 2 nd resin layer having a thickness of 10 μm, thereby obtaining the optical laminate of test example 3 formed of "the 2 nd resin layer/the front panel (with the shielding layer formed)/the adhesive layer/the 3 rd resin layer". The optical laminate of test example 3 had no colored layer.
< test example 5>
It differs from the optical laminate of test example 2 only in the thickness of the colored layer in the composite front panel. Specifically, in contrast to test example 2 in which the optical laminate was produced using the composite front panel 100 of example 1, test example 5 in which the optical laminate was produced using the composite front panel 100 of example 5.
< test example 6>
This is different from the optical laminate of test example 3 in the thickness of the 1 st resin layer 10 and the thickness of the colored layer 20 in the composite front panel, and in the thickness of the shielding layer 25. Specifically, in test example 3, the optical laminate was produced using the composite front plate 100 of example 1, whereas in test example 6, a composite front plate in which the thickness of the 1 st resin layer 10 was 60 μm and the thickness of the colored layer 20 was 12 μm was used. In the production of the composite front plate, the colored layer 20 was formed by printing 2 times so that the coating thickness after drying became a discharge amount of 6 μm.
An optical laminate 501 having a configuration shown in fig. 13 was obtained by printing 1 time with a 460-mesh screen using a colorant-containing layer-forming composition (black) as an ink so that the ink had the same width as the colored layer 20 on the display-side surface of the composite front panel and the discharge amount of 6 μm after drying, and forming a shielding layer 25 formed of a black printed layer having a thickness of 6 μm and a width of 25mm over the entire circumference of the peripheral edge portion, using a screen of 6 mesh.
The surface of the obtained optical laminate 501 on the display side and the surface of the 3 rd resin layer on the side to be bonded were subjected to corona treatment. Then, the layers were laminated so as to be "optical laminate 501/pressure-sensitive adhesive layer/3 rd resin layer", and were bonded using a roll bonding machine, followed by curing in an autoclave, whereby optical laminate 503 shown in fig. 15 was obtained.
The resin composition for forming the 2 nd resin layer was applied to the viewing side surface of the obtained optical laminate 503 and cured by irradiation with ultraviolet rays to form the 2 nd resin layer having a thickness of 10 μm, thereby obtaining an optical laminate of test example 6 having a configuration similar to that of the optical laminate 504 shown in fig. 16 and including the "2 nd resin layer/optical laminate 501/pressure-sensitive adhesive layer/3 rd resin layer".
[ evaluation ]
< air bubbles on the surface of adhesive layer >
The surfaces of the pressure-sensitive adhesive layers on the composite front panel side were observed with an optical microscope (manufactured by Olympus) for the optical laminates of test examples 1 to 6, and the generation of bubbles was evaluated based on the following criteria. The evaluation results are shown in table 2.
A: no bubbles were observed and,
b: bubbles were observed only in the periphery of the colored layer (non-display region),
c: bubbles were observed in the periphery (non-display region) and other regions (display regions) of the colored layer.
< difference in level of concavity of viewing-side surface >
The optical layered bodies of test examples 1 to 6 were observed on the viewing side surface with an interferometer microscope (Bruker GT), and the height of the difference in height between the display region and the non-display region in which the colored layer was formed (the difference between the maximum height and the minimum height) was measured. No difference in height was observed in the optical laminates of test examples 1 to 3. That is, the height of the step is 0 (zero) μm. The evaluation results are shown in table 2.
< measurement of optical Density >
From the optical layered bodies of test examples 1 to 6, the area (non-display area) where the colored layer 20 was formed was cut out in a size of 117mm × 154mm, and samples for optical density measurement were prepared. The sample was set in an optical density measuring instrument (product name: 361T, manufactured by X-rite Co., Ltd.), the light source on the upper part of the viewing side surface of the sample was turned on to be focused on the colored layer (the composite layer formed of the colored layer and the shielding layer in the case where the shielding layer was formed), the light source on the upper part was turned off, the light source on the lower part located on the display side surface of the sample was turned on, and the optical density was measured with the colored layer (the composite layer formed of the colored layer and the shielding layer in the case where the shielding layer was formed) as a measurement region. The measurement results are shown in table 2.
[ Table 2]
Claims (10)
1. A composite front panel used by being disposed on a front surface side of the image display device,
the composite front panel comprises a 1 st resin layer and a coloring layer provided locally,
the viewing side surface is a plane constituted by the viewing side surface of the 1 st resin layer,
the display side surface is a plane constituted by the display side surface of the 1 st resin layer and the display side surface of the colored layer.
2. A composite front panel as claimed in claim 1, wherein the coloured layer comprises a binder resin.
3. The composite front panel according to claim 1 or 2, wherein a thickness ratio T1 (%) calculated from the following formula (1) satisfies a relationship of the following formula (2a) when the thickness of the 1 st resin layer is a (μm) and the thickness of the colored layer is b (μm),
T1＝b/a×100 (1)
5≤T1≤42 (2a)。
4. an optical laminate comprising: a composite front panel as claimed in any one of claims 1 to 3; and a shielding layer laminated on the display side surface of the composite front panel at a position corresponding to the colored layer.
5. The optical stack according to claim 4, wherein the thickness of the masking layer is 12 μm or less.
6. The optical laminate according to claim 4 or 5, wherein when the thickness of the 1 st resin layer is a (μm), the thickness of the colored layer is b (μm), and the thickness of the shielding layer is c (μm), the optical laminate satisfies a relationship represented by the following formula (4a) in a thickness ratio T2 (%) calculated by the following formula (3),
T2＝(b+c)/a×100 (3)
T2≥30 (4a)。
7. an optical laminate comprising:
a composite front panel as claimed in any one of claims 1 to 3; and
at least one of a 2 nd resin layer laminated on the viewing side surface of the composite front panel and a 3 rd resin layer laminated on the display side surface of the composite front panel.
8. The optical laminate according to claim 7, which comprises the 3 rd resin layer laminated on the display-side surface of the composite front panel via an adhesive layer,
the thickness of the adhesive layer is 2-25 μm.
9. An image display device comprising the composite front panel according to any one of claims 1 to 3 disposed on a front surface side.
10. A method of manufacturing a composite front panel according to any one of claims 1 to 3, comprising the steps of:
a step of forming the colored layer locally on a base film;
a step of forming the 1 st resin layer by applying a resin layer forming composition on the base film so as to cover the viewing side surface of the colored layer and drying the composition; and
and a step of peeling the base film.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-154197 | 2018-08-20 | ||
| JP2018154197 | 2018-08-20 | ||
| JP2019014328A JP2020030395A (en) | 2018-08-20 | 2019-01-30 | Composite front plate and method for manufacturing the same |
| JP2019-014328 | 2019-01-30 |
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| CN110843266A true CN110843266A (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2013086466A (en) * | 2011-10-21 | 2013-05-13 | Asahi Glass Co Ltd | Front plate and method of manufacturing the same |
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| CN104025169A (en) * | 2011-10-20 | 2014-09-03 | 日本写真印刷株式会社 | Decorative film for display device and protective panel |
| US20170364029A1 (en) * | 2016-06-15 | 2017-12-21 | Samsung Display Co., Ltd. | Display device |
| CN107531037A (en) * | 2015-03-31 | 2018-01-02 | 三菱化学株式会社 | Laminated body |
| WO2018043627A1 (en) * | 2016-09-01 | 2018-03-08 | 大日本印刷株式会社 | Optical film and image display device |
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| CN104025169A (en) * | 2011-10-20 | 2014-09-03 | 日本写真印刷株式会社 | 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 |
| JP2013178332A (en) * | 2012-02-28 | 2013-09-09 | Toppan Printing Co Ltd | Decorative scattering prevention film for image display panel, and image display panel |
| CN107531037A (en) * | 2015-03-31 | 2018-01-02 | 三菱化学株式会社 | Laminated body |
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