KR20200021418A - Composite front plate and method for producing the same - Google Patents

Abstract

The present invention provides a novel composite front plate which is a composite front plate having flexibility and having a colored layer on a display side surface. The composite front plate is used by being arranged on a front surface side of an image display apparatus and has a first resin layer and a colored layer which is partially installed. In the composite front plate, a visibility side surface is a plane made of a visibility side surface of the first resin layer and a display side surface is a plane made of a display side surface of the first resin layer and a display side surface of the colored layer.

Description

Composite front panel and its manufacturing method {COMPOSITE FRONT PLATE AND METHOD FOR PRODUCING THE SAME}

TECHNICAL FIELD This invention relates to a composite front plate and its manufacturing method. Furthermore, it also relates to an optical laminated body and an image display apparatus.

As various image display apparatuses, such as a liquid crystal display device and an organic electroluminescent display device, the structure provided with the front plate on the visual side of a display panel for the purpose of protecting a display panel is known. 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) is colored in the circumferential edge of the display side surface (the surface on the opposite side to the viewer side surface) of the front plate provided on the viewer side of the display panel of the image display device. It is described to provide a printing layer as a layer. It is described that such an arrangement can realize an image display device not using a bezel.

Japanese Patent Application Laid-Open No. 2014-238533

In recent years, expectations for flexible image display devices have increased. The flexible image display device can be mounted on a non-planar surface or a folded surface, and can be folded or rolled up when carrying to improve portability.

Patent Literature 1 describes that a resin film having flexibility can be used as the front plate. That is, the composite front plate in which the colored layer is provided in the display side surface of a resin film is disclosed.

An object of the present invention is to provide a novel composite front plate and a method for producing the same as a composite front plate having flexibility and having a colored layer on the display side surface. Specifically, an object of the present invention is to provide a composite front plate which is less likely to generate bubbles when bonding the composite front plate to another member.

This invention provides the composite front plate, optical laminated body, image display apparatus, and the manufacturing method of a composite front plate which are shown below.

[1] A composite front panel disposed and used on the front side of an image display device,

It has a 1st resin layer and the colored layer provided in a part,

The viewing side surface is a plane constituted by the viewing side surface of the first resin layer,

The display side surface is a flat front plate comprised from the display side surface of the said 1st resin layer, and the display side surface of the said colored layer.

[2] The composite front plate according to [1], wherein the colored layer contains a binder resin.

[3] When the thickness of the first resin layer is a (μm) and the thickness of the colored layer is b (μm), the thickness ratio T1 (%) calculated by the following formula (1) is represented by the following formula (2a): The composite front plate as described in [1] or [2] which satisfy | fills the relationship of.

T1 = b / a × 100 (1)

5≤T1≤42 (2a)

[4] An optical laminate having a composite front plate according to any one of [1] to [3] and a shielding layer laminated at a position corresponding to the colored layer on the display side surface of the composite front plate.

[5] The optical laminate according to [4], wherein the shielding layer has a thickness of 12 µm or less.

[6] In the optical laminate, when the thickness of the first 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 following formula ( The optical laminated body as described in [4] or [5] which thickness ratio T2 (%) computed by 3) satisfy | fills the relationship of following formula (4a).

T2 = (b + c) / a × 100 (3)

T2≥30 (4a)

[7] the composite front plate according to any one of [1] to [3],

The optical laminated body which has at least one of the 2nd resin layer laminated | stacked on the said viewer side surface of the said composite front plate, and the 3rd resin layer laminated | stacked on the said display side surface of the said composite front plate.

[8] the third resin layer laminated on the display side surface of the composite front plate via an adhesive layer;

The optical laminated body as described in [7] whose thickness of the said adhesive layer is 2 micrometers-25 micrometers.

[9] An image display device having the composite front plate according to any one of [1] to [3], which is disposed on the front side.

[10] The method for producing a composite front plate according to any one of [1] to [3].

Forming the colored layer on a portion of the base film;

Applying the composition for resin layer formation so that it may cover the visual side of the said colored layer on the said base film, it is made to dry, and forms said 1st resin layer,

The manufacturing method which has a process of peeling the said base film.

According to this invention, the novel composite front plate which has flexibility and has a colored layer on the display side surface can be provided. Specifically, the present invention can provide a composite front plate in which bubbles are less likely to occur when bonding the composite front plate to another member.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows one form of the composite front plate of this invention.
2 is a schematic cross-sectional view showing an example of a method for producing a composite front plate.
It is a schematic sectional drawing which shows 1st Embodiment of the optical laminated body of this invention.
It is a schematic sectional drawing which shows 2nd Embodiment of the optical laminated body of this invention.
It is a schematic sectional drawing which shows 3rd Embodiment of the optical laminated body of this invention.
6 is a schematic cross-sectional view showing an example of the image display device 300.
7 is a top view of the image display device 300 as seen from the viewer side.
8 shows an example of a bent aspect when the image display device is a flexible display.
9 is a schematic cross-sectional view showing the first embodiment of the image display device of the present invention.
10 is a schematic cross-sectional view showing the second embodiment of the image display device of the present invention.
11 is a schematic cross-sectional view showing the third embodiment of the image display device of the present invention.
12 is a schematic cross-sectional view showing the fourth embodiment of the image display device of the present invention.
It is a schematic sectional drawing which shows an example of the optical laminated body which has a shielding layer of this invention.
It is a schematic sectional drawing which shows the modification of the optical laminated body of 1st Embodiment.
It is a schematic sectional drawing which shows the modification of the optical laminated body of 2nd Embodiment.
It is a schematic sectional drawing which shows the modification of the optical laminated body of 3rd Embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings. In all the following drawings, in order to make each component easy to understand, the scale is adjusted suitably and the scale of each component shown in drawing, and the scale of an actual component do not necessarily correspond. The same reference numerals refer to the same components, and unless otherwise noted, the description of the same reference numerals is common.

Composite Front Panel

<Configuration>

1 is a schematic cross-sectional view showing one embodiment of the composite front plate of the present invention. The composite front plate 100 shown in FIG. 1 has the 1st resin layer 10 and the coloring layer 20 provided in one part. The composite front plate 100 has a display area A and a non-display area B, and the colored layer 20 is provided in an area corresponding to the non-display area B. FIG.

The viewing side surface 100a of the composite front plate 100 is a plane constituted by the viewing side surface 10a of the first resin layer 10. The display side surface 100b of the composite front plate 100 is a plane composed of 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 have a function of protecting the entire surface of the image display device, and may further have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like.

The thickness of the composite front plate 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 80% or less, 60% or less, or 50% or less of the thickness of the composite front plate 100, for example.

When the thickness of the 1st resin layer 10 is a (micrometer) and the thickness of the colored layer 20 is b (micrometer), the composite front plate 100 calculates the thickness ratio T1 calculated by following formula (1). It is preferable that (%) satisfy | fills the relationship of following formula (2a). The thickness of the 1st resin layer 10 means the thickness of the thickest part in the 1st resin layer 10, and therefore corresponds with the thickness of the composite front plate 100. FIG.

T1 = b / a × 100 (1)

5≤T1≤42 (2a)

When thickness ratio T1 exceeds 42%, it may be difficult to maintain flatness of the visual side surface of the composite front plate 100, and a concave step may occur in the display area A of the visual side surface. . Moreover, when thickness ratio T1 is less than 5%, it may be difficult to obtain sufficient optical density. As for thickness ratio T1, it is more preferable to satisfy | fill the relationship of following formula (2b).

7.5≤T1≤30 (2b)

Although the composite front plate 100 is provided with the colored layer 20 which exposes to the display side surface 100b, since the display side surface 100b is planar, the damage of the colored layer 20 is suppressed. can do. Moreover, since the display side surface 100b is planar, it can suppress that the bubble resulting from the level difference of a colored layer and a resin layer mixes at the time of joining with another layer.

<Production method>

2 (a) to 2 (d) are schematic cross-sectional views showing an example of the manufacturing method of the composite front plate 100. First, the base film 110 is prepared (FIG. 2 (a)), and the colored layer 20 is formed in one area | region on the base film 110 (FIG. 2 (b)). Next, the composition for resin layer formation is apply | coated so that the visual recognition side surface 20a of the colored layer 20 may be apply | coated, and the resin layer 10 is formed by drying or hardening the composition for resin layer formation (FIG. 2 (c). )). Next, the base film 110 is peeled off, and the display side surface 20b of the colored layer 20 and the display side surface 10b of the resin layer 10 are exposed to expose the composite front plate sheet 100 '. (Fig. 2 (d)). Next, as needed, the composite front plate sheet 100 'is cut | disconnected, the unnecessary part is cut | disconnected, and the composite front plate 100 is obtained.

The base film 110 is not particularly limited as long as the base film 110 can be separated from the composite front plate sheet 100 ′ without being modified in formation of the colored layer 20 and the resin layer 10. As the material for forming the base film 110, for example, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, stretchability, and the like is used.

As such a thermoplastic resin, For example, polyolefin resin, such as linear polyolefin resin and cyclic polyolefin resin (norbornene resin), polyester resin, (meth) acrylic resin, cellulose triacetate, cellulose diacetate Cellulose ester resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl acetate resin, polyarylate resin, polystyrene resin, polyether sulfone resin, polysulfone resin, polyamide type Resin, polyimide resin, or a mixture thereof. Moreover, you may use the copolymer which copolymerized the monomer of the said resin as a formation material of a base film. Among these, polyester resins, such as polyolefin resins, such as a polypropylene, and an amorphous polyethylene terephthalate, are preferable.

1-500 micrometers is preferable, as for the thickness of the base film 110 from a point of strength and handleability, 1-300 micrometers is more preferable, 5-200 micrometers is still more preferable, 5-150 micrometers is especially preferable.

(Color layer)

The shape and color of the colored layer 20 are not limited, and can be appropriately selected depending on the use and the design. As the colored layer 20, the layer colored by colors, such as black, red, white, dark blue, silver, and gold, can be illustrated. The colored layer 20 may be formed by a single layer or may be formed by a plurality of layers. When the colored layer 20 is formed from a some layer, as the color of the colored layer 20, one type of color may be employ | adopted and a some color may be employ | adopted.

When the colored layer 20 is an organic layer containing binder resin etc., in order to achieve a certain optical density, it exists in the tendency for thickness to become thick compared with the inorganic layer containing a metal layer. When the colored layer is thick, a step is likely to occur on the visual side of the resin layer. According to one Embodiment of this invention, even if a colored layer consists of an organic layer, it is possible to make a step small by controlling thickness ratio.

Formation of the colored layer 20 on the base film may be performed by printing a method using an ink or a paint, a vapor deposition method using a powder of a metal pigment, forming a colored layer 20 containing a metal pigment in advance, and bonding the same. It can form by a method. Moreover, you may combine these methods. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by the printing method may be repeated to obtain a colored layer 20 having a desired thickness. The ink or paint used for forming the colored layer 20 contains, for example, a binder resin, a colorant, a solvent, and optional additives.

Examples of the binder resins include chlorinated polyolefins (eg, chlorinated polyethylene and chlorinated polypropylene), polyester resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. . Binder resin may be used independently and may use 2 or more types together. The binder resin may be a thermopolymerizable resin or a photopolymerizable resin. When a colored layer contains binder resin, it can contribute to the adhesive improvement to the resin layer 10 of the colored layer 20. FIG.

 The colorant may be appropriately selected depending on the desired coloring. As a coloring agent, For example, Inorganic pigments, such as a titanium bag, zincation, carbon black, iron black, bengalla, chrome vermilion, ultramarine blue, cobalt blue, sulfur lead, titanium yellow; Organic pigments or dyes such as phthalocyanine blue, indanthrene blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, and aniline black; Metal pigments composed of flaky flakes such as aluminum and brass; And pearlescent pigments (pearl pigments) composed of flaky flakes such as titanium dioxide coated mica and basic lead carbonate. It is preferable that a coloring agent is contained 50-200 mass parts with respect to 100 mass parts of binder resins.

The thickness of the colored layer 20 is not particularly limited as long as it is a thickness that is not exposed to the visual side 100a of the composite front plate 100. From a viewpoint of improving the shielding effect of the colored layer 20, it is preferable that it is 1 micrometer-50 micrometers, It is more preferable that it is 3 micrometers-30 micrometers, 3 micrometers-20 micrometers may be sufficient. When the colored layer 20 is black, even if it is thin, a high shielding effect can be acquired compared with another color.

It is preferable that the optical density measured by the method as described in the Example mentioned later of the colored layer 20 is 2.0 or more, and it is more preferable that it is 2.5 or more.

The visual side 20a of the colored layer 20 is not limited to the shape which is substantially parallel to the display side surface 20b as shown in FIG. In order to impart design, the surface may be inclined or jagged. Moreover, it is good also as a rough surface from a viewpoint of improving the adhesiveness with the resin layer 10. FIG.

It is preferable that a colored layer does not melt | dissolve or swell with the solvent which the composition for resin layer formation contains.

When the colored layer 20 is provided at the peripheral edge of the composite front plate 100, the colored layer 20 is not limited to the form provided at the entire circumference of the peripheral edge portion, and is provided only at a portion of the peripheral edge portion depending on a desired design or the like. You may also. The width of the colored layer 20 can be appropriately determined according to the size of the display area, the desired design, and the like, and can be, for example, in the range of 1 mm to 20 mm.

(1st resin layer)

The polymer material included in the first resin layer 10 is not particularly limited as long as it can transmit light. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, polyacryl, polyimide , Polyether sulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, polymethyl meta Polymer materials, such as an acrylate, a polyethylene terephthalate, a polybutylene terephthalate, a polyethylene naphthalate, a polycarbonate, and a polyamideimide, can be used individually or in combination of 2 or more types. Among them, a resin layer containing a polymer material such as polyimide, polyamide, polyamideimide and the like, which has excellent flexibility and can form a resin layer having high strength and high transparency, is suitable.

The composition for resin layer formation contains the precursor of a polymeric material or a polymeric material, and the solvent which can melt | dissolve or disperse these. The solvent may be selected so as not to swell or dissolve the colored layer. In view of this, as the solvent, N, N-dimethylacetamide (DMAc), N, N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), γ-butyrolactone (GBL), N-methyl Pyrrolidone (NMP), ethyl acetate, methyl ethyl ketone (MEK), tetrahydrofuran, 1,4-dioxane, acetone, cyclopentanone, dimethyl sulfoxide, xylene and combinations thereof. The composition for resin layer formation may contain additives known in the art, such as a polymerization initiator, a polymerization start aid, a leveling agent, an antioxidant, and a light stabilizer, as necessary.

The coating method of the composition for resin layer formation is performed using a conventionally well-known coating method. As a conventionally well-known coating method, for example, a roll coating method such as a wire bar coating method, a reverse coating, 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 dipping method, Spray method etc. are mentioned.

[Optical laminate]

One aspect of the optical laminated body of this invention has the composite front plate 100 mentioned above and the shielding layer laminated | stacked in the position corresponding to the colored layer 20 on the display side surface of a composite front plate.

It is sectional drawing which shows an example of the optical laminated body which has a shielding layer. The optical laminated body 501 shown in FIG. 13 has the composite front plate 100 shown in FIG. 1, and is shielded layer 25 laminated | stacked in the position corresponding to the colored layer 20 on the display side surface 100b. Have additional. By having the shielding layer 25, the optical density of the non-display area B can be improved. It is preferable that the optical density of the non-display area B which has the shielding layer 25 is 3.0 or more.

The thickness of the shielding layer 25 is 12 µm in order to suppress the mixing of bubbles due to the shielding layer 25 protruding from the display side surface of the composite front plate 100 at the time of bonding with another layer. It is preferable that it is the following, and it is more preferable that it is 6 micrometers or less. The thickness of the shielding layer 25 can be 1 micrometer or more, for example.

In the optical laminated body which has the shielding layer 25, the thickness of the 1st resin layer 10 is a (micrometer), the thickness of the colored layer 20 is b (micrometer), and the thickness of the shielding layer 25 is c In terms of (μm), from the viewpoint of improving the optical density of the non-display area B, it is preferable that the thickness ratio T2 (%) calculated by the following formula (3) satisfies the relationship of the following formula (4a). .

T2 = (b + c) / a × 100 (3)

T2≥30 (4a)

In addition, in the optical laminated body comprised using the composite front plate which satisfy | fills following formula (2c), although said formula (4a) does not necessarily satisfy, it does not satisfy following formula (2c), but satisfy | fills following formula (2d) Also in this case, the optical laminated body which satisfy | fills said Formula (4a) can be comprised by adjusting the thickness of the shielding layer 25. FIG. As one preferable aspect of the optical laminated body which has the shielding layer 25, it has the composite front plate 100 which satisfy | fills following formula (2d), and the shielding layer 25, and also satisfy | fills said Formula (4a). An optical laminated body is mentioned.

T1≥30 (2c)

T1 <30 (2d)

In the optical laminated body which has the shielding layer 25, it is preferable that thickness ratio T2 (%) satisfy | fills the relationship of following formula (4b).

T2≤50 (4b)

One aspect of the optical laminated body of this invention is the 2nd resin layer laminated | stacked on the visual side surface 100a of the composite front plate 100, and the composite front plate 100 in addition to the composite front plate 100 mentioned above. At least one of the third resin layers laminated on the display side surface 100b. The second resin layer is, for example, a hard coat layer. The third resin layer is, for example, a hard coat layer or a protective film. A protective film can be laminated | stacked through the bonding layer.

<1st embodiment>

3 is a schematic cross-sectional view showing the first embodiment of the optical laminate of the present invention. The optical laminated body 201 shown in FIG. 3 has the composite front plate 100, and further has the 2nd resin layer 30 laminated | stacked on the visual side surface 100a. 14 shows an optical laminate 502 which is a modification of the optical laminate 201 of the first embodiment. The optical laminated body 502 differs from the optical laminated body 201 only in the point which has the shielding layer 25. FIG.

<2nd embodiment>

4 is a schematic cross-sectional view showing a second embodiment of the optical laminate of the present invention. The optical laminated body 202 shown in FIG. 4 has the composite front plate 100, and has the bonding layer 50 and the 3rd resin layer 40 laminated | stacked on the display side surface 100b. 15 shows an optical laminate 503 that is a modification of the optical laminate 202 of the second embodiment. The optical laminated body 503 differs from the optical laminated body 202 only in the point which has the shielding layer 25. FIG.

<Third embodiment>

5 is a schematic cross-sectional view showing a third embodiment of the optical laminate of the present invention. The optical laminated body 203 shown in FIG. 5 has the composite front plate 100, and is laminated | stacked on the 2nd resin layer 30 laminated | stacked on the viewing side surface 100a, and the display side surface 100b. The bonding layer 50 and the third resin layer 40 are provided. FIG. 16 shows an optical laminate 504 as a modification of the optical laminate 203 of the third embodiment. The optical laminated body 504 differs from the optical laminated body 203 only in the point which has the shielding layer 25. FIG.

(2nd resin layer)

The 2nd resin layer 30 laminated | stacked on the visual side surface 100a of the composite front plate 100 is a hard-coat layer, for example. When an optical laminated body is used for the whole surface of the touchscreen system image display apparatus, for example, since the 2nd resin layer 30 turns into a touch surface, the 2nd resin layer 30 with high hardness and scratch resistance is high. Is preferably used. The hard coat layer is, for example, a cured layer of ultraviolet curable resin. As ultraviolet curing resin, acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin, etc. are mentioned, for example. The hard coat layer may contain the additive in order to improve strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles or mixtures thereof.

(Third resin layer)

The 3rd resin layer 40 laminated | stacked on the display side surface 100b of the composite front plate 100 is a hard-coat layer, a protective film, etc., for example. From the viewpoint of preventing damage in transportation, storage and the like, the third resin layer 40 is preferably one having high hardness and high scratch resistance. The description in a 2nd resin layer is applied to a hard-coat layer.

As a protective film, the protective film normally used in the technical field can be used. Although it does not specifically limit as a material of a protective film, For example, a cyclic polyolefin type resin film, triacetyl cellulose, diacetyl cellulose, etc. Cellulose acetate resin film made of resin, polyester terephthalate, polyethylene naphthalate, polyester resin film made of resin such as polybutylene terephthalate, polycarbonate resin film, (meth) acrylic resin film, polypropylene resin Films known in the art, such as a film, are mentioned. 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, and preferably 40 µm or more. Even if the protective film has a phase difference, it is not necessary to have it.

(Bonding layer)

The bonding layer 50 is a layer which bonds together through the composite front plate 100 and a 3rd resin layer, is an adhesive layer or an adhesive bond layer, and an adhesive layer is used suitably.

Since the colored layer 20 is inherent in the composite front plate 100, the bonding layer 50 does not need to absorb the thickness of the colored layer 20, and can be made thin. The thickness of a bonding layer is 2 micrometers-100 micrometers, for example, and can be 2 micrometers-25 micrometers, and 2 micrometers-20 micrometers.

An adhesive layer can be comprised by the adhesive composition which has resin, such as (meth) acrylic-type, rubber type, urethane type, ester type, silicone type, and polyvinyl ether type as a main component. Especially, the adhesive composition which uses (meth) acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is suitable. An active energy ray hardening type and a thermosetting type may be sufficient as an adhesive composition.

 As a (meth) acrylic-type resin (base polymer) used for an adhesive composition, it is (for example, butyl (meth) acrylate, ethyl (meth) acrylate, isococtane (meth) acrylate, and 2-ethylhexyl (meth) acrylate. The polymer or copolymer which uses 1 type, or 2 or more types of a meta) acrylic acid ester as a monomer is used suitably. It is preferable to copolymerize a polar monomer to a base polymer. As a polar monomer, for example, (meth) acrylic acid, (meth) acrylic acid 2-hydroxypropyl, (meth) acrylic acid hydroxyethyl, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate And monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as glycidyl (meth) acrylate.

Although the adhesive composition may contain only the said base polymer, it usually contains a crosslinking agent further. As a crosslinking agent, it is a divalent or more metal ion which forms a carboxylic acid metal salt between carboxyl groups; As a polyamine compound, forming an amide bond between carboxyl groups; As a polyepoxy compound or polyol, forming an ester bond between carboxyl groups; As a polyisocyanate compound, what forms an amide bond between carboxyl groups is illustrated. Especially, a polyisocyanate compound is preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays or electron beams, and has adhesiveness even before active energy ray irradiation, and can be brought into close contact with adherends such as a film. It is an adhesive composition which has a property which can harden | cure by and adjust adhesive force. It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curing type. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray polymerizable compound in addition to the base polymer and the crosslinking agent. If necessary, a photopolymerization initiator, a photosensitizer, or the like may also be included.

The pressure-sensitive adhesive composition is composed of fine particles, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powders and other inorganic powders, etc.), antioxidants, and ultraviolet absorbers for imparting light scattering properties. And additives such as dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, and photopolymerization initiators.

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

(Shielding layer)

The shielding layer 25 is provided so as to correspond to the colored layer 20, and it is preferable that the width of the shielding layer 25 in the surface direction is substantially the same as the width of the colored layer 20 in the surface direction. The shielding layer 25 contains a colorant. It is preferable that a coloring agent contains the coloring agent with a high function of an optical density improvement, and it is preferable to contain black pigments, such as carbon black and iron black, for example. The shielding layer 25 may be formed by a single layer or may be formed by a plurality of layers.

The shielding layer 25 can be formed by methods, such as a printing method and a coating method. The shielding layer 25 may be formed directly on the display side surface of the composite front plate 100, or may be formed by transferring onto the display side surface what is formed on another substrate. Regarding the printing method, the above description about the colored layer 20 is applied.

[Image display device]

The image display device of the present invention includes the composite front plate 100 or the optical stack described above, and a display stack including a display panel. A composite front plate or an optical laminated body and a display laminated body can be laminated | stacked through the bonding layer.

6 is a schematic cross-sectional view showing an example of the image display device 300. The image display device 300 has a composite front plate 100 on the viewing side, and has a bonding layer 51 and a display laminate 400 stacked on the display side surface of the composite front plate 100. Description of the bonding layer 50 in the above-mentioned optical laminated body is applied to the bonding layer 51.

7 is a top view of the image display device 300 viewed from the viewer's side. In the non-display area B of the peripheral portion, the colored layer 20 is visually recognized. According to the coloring layer 20, the wiring etc. which are arrange | positioned at the non-display area B can be shielded. If the colored layer 20 is provided so as to correspond to the non-display area B, the in-plane arrangement position is not limited. However, by disposing the colored layer 20 in the peripheral portion, light leakage can be suppressed and visually recognized like a picture frame. Therefore, the design can be improved.

In the image display apparatus 300, the shape and size of the surface direction of the composite front plate 100 correspond to the shape and size of the surface direction of the image display device 300 in which it is used. The shape in the plane direction of the image display device 300 is preferably a rectangular shape, more preferably a rectangular shape having a long side and a short side. This rectangular shape is preferably rectangular. When the shape of the plane direction of the image display apparatus 300 is rectangular, the length of a long side is 50 mm-300 mm, for example, Preferably it is 100 mm-280 mm. The length of a short side is 30 mm-250 mm, for example, Preferably it is 60 mm-220 mm. When the composite front plate 100 has a rectangular shape, at least one kind of processing consisting of R processing, notch processing and punching processing may be performed.

The image display device 300 can be configured as a flexible display panel. 8 shows an example of a bent aspect when the image display device is a flexible display. FIG. 8A is a flexible display 305 configured to be foldable with the viewing side surface inward, and FIG. 8B is a flexible display 306 which can be wound.

The image display device 300 can be configured as a touch panel type image display device. A touch panel type image display apparatus is provided with a touch sensor panel, and the composite front plate 100 provided in the front surface comprises a touch surface. In the image display apparatus of a touch sensor panel system, the structure in which the hard-coat layer is laminated | stacked on the visual recognition side surface of the composite front plate 100 is preferable.

<1st embodiment>

9 is a schematic cross-sectional view showing the first embodiment of the image display device of the present invention. The image display device of this embodiment is a liquid crystal display device of a touch panel method. The liquid crystal display device 301 has the composite front plate 100, the bonding layer 51, the polarizing plate 60a, the touch sensor panel 70, the liquid crystal display element unit 81, and the polarizing plate 60b in order from the viewing side. ) And a backlight unit 90. The liquid crystal display device 301 has a display area A and a non-display area B, and includes the colored layer 20 corresponding to the non-display area B in the composite front panel 100.

<2nd embodiment>

10 is a schematic cross-sectional view showing the second embodiment of the image display device of the present invention. The image display device of this embodiment is a liquid crystal display device of a touch panel method. The liquid crystal display device 302 differs from the liquid crystal display device 301 shown in FIG. 9 only in that the stacking positions of the polarizing plate 60a and the touch sensor panel 70 are changed.

<Third embodiment>

11 is a schematic cross-sectional view showing the third embodiment of the image display device of the present invention. The image display device of this embodiment is an organic electroluminescence (EL) display device of a touch panel method. The organic EL display device 303 includes a composite front plate 100, a bonding layer 51, a polarizing plate 60c, a touch sensor panel 70, and an organic EL unit 82 in order from the viewing side. The organic EL display device 303 has a display area A and a non-display area B, and includes a colored layer 20 corresponding to the non-display area in the composite front panel 100.

<4th embodiment>

12 is a schematic cross-sectional view showing the fourth embodiment of the image display device of the present invention. The image display device of this embodiment is an organic EL display device of a touch panel method. The organic EL display device 304 differs from the organic EL display device 303 illustrated in FIG. 11 only in that the stacked positions of the polarizing plate 60c and the touch sensor panel 70 are changed.

(Display unit)

As a display unit contained in the image display apparatus 300, the display unit containing display elements, such as a liquid crystal display element, an organic electroluminescence display element, an inorganic electroluminescence display element, a plasma display element, a field emission display element, is mentioned, for example. Can be.

The image display device 300 can be used as a flexible display. In this case, since a display element can be made flexible, it is preferable that a display element is a liquid crystal display element, an organic electroluminescence display element, and an inorganic EL display element.

(Polarizing plate)

As a polarizing plate, the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy, or the film which contains as a polarizer the film which apply | coated and hardened the pigment | dye which has absorption anisotropy is mentioned. As a pigment | dye which has absorption anisotropy, a dichroic dye is mentioned, for example. As a dichroic dye, iodine and a dichroic organic dye are used specifically ,. Dichroic organic dyes include C.I. The dichroic direct dye which consists of compounds, such as a dichroic dye which consists of disazo compounds, such as DIRECT RED 39, and a tris azo, tetrakis azo, is contained. As a film which apply | coated the pigment | dye which has absorption anisotropy used as a polarizer, the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy, or the composition containing the dichroic dye which has liquid crystallinity, or a dichroic dye and a polymeric liquid crystal The film etc. which have a layer obtained by apply | coating and hardening the containing composition are mentioned. Since the film which apply | coated and hardened the pigment | dye which has absorption anisotropy is cured compared with the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy, it is preferable.

Depending on the kind of image display apparatus, a polarizing plate may contain retardation film and a brightness improving film. When applied to an organic EL display device, the polarizing plate may be a circular polarizing plate having a film composed of a λ / 4 plate and a positive C plate or a film composed of a λ / 4 plate and a λ / 2 plate as a retardation film. The retardation film may be formed of a material containing a protective film described later or a composition containing a polymerizable liquid crystal compound.

(1) Polarizing Plate Having Stretched Film as Polarizer

The polarizing plate equipped with the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy as a polarizer is demonstrated. The stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy which is a polarizer adsorbs the dichroic dye normally by uniaxially stretching a polyvinyl alcohol-type resin film, and dyeing a polyvinyl alcohol-type resin film with a dichroic dye. It is manufactured through the process of making it, and the process of processing the polyvinyl alcohol-type resin film which the dichroic dye adsorb | sucked with the boric acid aqueous solution, and the process of washing with water after the process by aqueous boric acid solution. Such a polarizer may be used as a polarizing plate as it is, and what bonded together the transparent protective film on the single side | surface or both surfaces may be used as a polarizing plate. The thickness of the polarizer thus obtained is preferably 2 µm to 40 µm.

Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate type resin. As polyvinyl acetate type resin, the copolymer of vinyl acetate and the other monomer copolymerizable with it besides the polyvinyl acetate which is a homopolymer of vinyl acetate is used. As another monomer copolymerizable with vinyl acetate, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamide which has an ammonium group, etc. are mentioned, for example.

The saponification degree of polyvinyl alcohol-type resin is about 85-100 mol% normally, Preferably it is 98 mol% or more. The polyvinyl alcohol-based resin may be modified. For example, polyvinyl formal and polyvinyl acetal modified with aldehydes can also be used. The polymerization degree of polyvinyl alcohol-type resin is about 1,000-10,000 normally, Preferably it is the range of 1,500-5,000.

What formed such a polyvinyl alcohol-type resin into a film is used as a raw film of a polarizing plate. The method of forming a polyvinyl alcohol-type resin into a film is not specifically limited, It can form into a film by a well-known method. The film thickness of a polyvinyl alcohol-type raw film can be about 10 micrometers-150 micrometers, for example.

 Uniaxial stretching of a polyvinyl alcohol-type resin film can be performed before dyeing with a dichroic dye, simultaneously with dyeing, or after dyeing. When uniaxial stretching is performed after dyeing, this uniaxial stretching may be performed before boric acid treatment, or may be performed during boric acid treatment. Moreover, it is also possible to uniaxially stretch in these several steps. In uniaxial stretching, you may extend | stretch uniaxially between the rolls from which a circumferential speed differs, and you may extend | stretch uniaxially using a thermal roll. Moreover, uniaxial stretching may be dry stretching which extends | stretches in air | atmosphere, and wet extending | stretching may be performed in the state which swelled the polyvinyl alcohol-type resin film using a solvent. A draw ratio is about 3 to 8 times normally.

Although it does not specifically limit as a material of the protective film bonded to one or both surfaces of a polarizer, For example, a cellulose acetate resin film which consists of resins, such as a cyclic polyolefin resin film, a triacetyl cellulose, and a diacetyl cellulose, polyethylene Films known in the art, such as polyester resin films, polycarbonate resin films, (meth) acrylic resin films, and polypropylene resin films, which are made of resins such as terephthalate, polyethylene naphthalate, and polybutylene terephthalate Can be mentioned. 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, and preferably 20 µm or more. Even if the protective film has a phase difference, it is not necessary to have it.

(2) A polarizing plate comprising a film formed of a liquid crystal layer as a polarizer

The polarizing plate which comprises the film formed from the liquid crystal layer as a polarizer is demonstrated. As a film which apply | coated the pigment | dye which has absorption anisotropy used as a polarizer, the film obtained by apply | coating and hardening the composition containing the dichroic dye which has liquid crystallinity, or the composition containing a dichroic dye and a liquid crystal compound to a base material, etc. Can be mentioned. The said film may peel off a base material, or may be used as a polarizing plate with a base material, or may be used as a polarizing plate in the structure which has a protective film in the single side | surface or both surfaces. As said protective film, the thing similar to the polarizing plate which equips said stretched film as a polarizer is mentioned.

Although the thinner the film obtained by apply | coating and hardening the pigment | dye which has absorption anisotropy, it is more thin, but it exists in the tendency for intensity | strength to fall and inferior to workability. The thickness of the said film is 20 micrometers or less normally, Preferably it is 5 micrometers or less, More preferably, they are 0.5 micrometer or more and 3 micrometers or less.

As a film obtained by apply | coating the pigment | dye which has the said absorption anisotropy, the film of Unexamined-Japanese-Patent No. 2013-37353, Unexamined-Japanese-Patent No. 2013-33249, etc. are mentioned specifically ,.

(Touch sensor panel)

As the touch sensor panel, as long as the sensor can detect the touched position, the detection method is not limited, and the touch such as the resistive film method, the capacitive coupling method, the optical sensor method, the ultrasonic method, the electromagnetic inductive coupling method, the surface acoustic wave method, and the like can be used. A sensor panel is illustrated. In terms of low cost, a resistive film type touch panel or a capacitive touch type touch sensor panel is suitably used.

Examples of the resistive touch sensor panel include a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, a transparent conductive film provided as a resistive film on the entire surface inside 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 plate 100 is touched, the opposing resistive film is short-circuited and a current flows through the resistive film. The touch position detection circuit detects a change in voltage at this time, and the touched position is detected.

An example of the capacitive coupling type touch sensor panel is comprised by a board | substrate, the transparent electrode for position detection provided in the whole surface of a board | substrate, and a touch position detection circuit. In the image display device provided with the capacitive touch sensor panel, when the surface of the composite front panel 100 is touched, the transparent electrode is grounded through the human body's capacitance at the touched point. The touch position detection circuit detects the ground of the transparent electrode, and the touched position is detected.

[Use of Image Display Device]

The image display device according to the present invention can be used as a mobile device such as a smartphone or a tablet, a TV, a digital photo frame, an electronic signage, a measuring instrument or instruments, an office device, a medical device, a computer device, or the like. The bending direction of the image display device may be a bend with the composite front plate 100 inward or a bend with the composite front plate 100 outward. According to this invention, compared with the case where the colored layer 20 protrudes and is arrange | positioned on the surface of the composite front plate 100, design freedom becomes high and it can prevent air drying at the time of lamination | stacking.

Example

Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited by these examples.

[Preparation of Composition (Color) for Coloring Agent-Containing Layer Formation]

<Ink component>

Acetylene black 15 mass%

75 mass% of polyester

Glutaric acid dimethyl ester 2.5% by mass

Succinic acid 2 mass%

Isophorone 5.5 mass%

<Hardener>

75% by mass of aliphatic polyisocyanate

25% by mass of ethyl acetate

<Solvent>

Isophorone

<Preparation method>

10 mass parts of hardening | curing agents and 10 mass parts of solvent were added with respect to 100 mass parts of ink components, and it stirred, and obtained the composition for colorant containing layer formation (black).

[Preparation of Composition (Transparent) for Protective Layer Formation]

<Ink component>

90 mass% of polyester

Glutaric acid dimethyl ester 2.5% by mass

Succinic acid 2 mass%

Isophorone 5.5 mass%

<Hardener>

75% by mass of aliphatic polyisocyanate

25% by mass of ethyl acetate

<Solvent>

Isophorone

<Preparation method>

10 mass parts of hardening | curing agents and 10 mass parts of solvent were added with respect to 100 mass parts of ink components, and it stirred, and obtained the composition for protective layer formation.

[Preparation of Adhesive Layer]

A (meth) acrylic adhesive layer (thickness 25 micrometers) was prepared.

[Preparation of Resin Composition for Forming Second Resin Layer]

An ultraviolet curing acrylic resin composition was prepared.

[Preparation of Third Resin Layer]

TAC film (25 micrometers in thickness) was prepared.

EXAMPLES 1-5

<Example 1>

(Production of composite front panel)

In the order shown in FIG.2 (a)-(d), the composite front plate of Example 1 was produced. Specifically, first, as a base film 110, a PET film (125 μm in thickness, RF Series manufactured by SKC HASS) having a size of 210 cm × 279 cm was prepared. On the surface of the base film 110, screen printing using the colorant-containing layer forming composition (black) prepared above as an ink, using a screen of 460 mesh, prints the discharge amount of which the coating thickness after drying becomes 6 µm twice. After performing, printing of the discharge amount which becomes 3 micrometers of application | coating thicknesses after drying was performed once. In this way, the colored layer 20 which consists of a black printing layer of thickness 15micrometer and width 25mm was formed in the perimeter of the periphery part (FIG. 2 (b)).

On the surface in which the colored layer 20 of the base film 110 is formed, the resin composition for 1st resin layer formation (containing polyimide resin) is apply | coated so that thickness after drying may be 50 micrometers, and it is 30 minutes at 80 degreeC. Prebaked. Then, the base film 110 is peeled off, the display side surface 20b of the colored layer 20 and the display side surface 10b of the resin layer 10 are exposed, and post-baked at 200 degreeC for 30 minutes, The composite front plate 100 was obtained (FIG. 2 (d)).

<Example 2>

Example 2 differs from the composite front plate 100 produced in Example 1 only in that the thickness after drying of the colored layer 20 becomes 18 µm and the thickness after drying of the first resin layer becomes 70 µm. The composite front panel was made. Regarding the formation of the colored layer 20, in Example 1, after printing the discharge amount of which the coating thickness after drying became 6 micrometers twice, the printing of the discharge amount which the coating thickness after drying became 3 micrometers was performed once. In Example 2, printing of the discharge amount whose coating thickness after drying becomes 6 micrometers was performed 3 times.

<Example 3>

Example 3 which differs from the composite front plate 100 produced in Example 1 only so that the thickness after drying of the colored layer 20 may become 3 micrometers, and the thickness after drying of a 1st resin layer becomes 40 micrometers. The composite front panel was made. Regarding the formation of the colored layer 20, in Example 1, after printing the discharge amount of which the coating thickness after drying became 6 micrometers twice, the printing of the discharge amount which the coating thickness after drying became 3 micrometers was performed once. In Example 3, printing of the discharge amount which the application | coating thickness after drying becomes 3 micrometers was performed only once.

<Example 4>

The composite front plate of Example 4 was produced from the composite front plate 100 produced in Example 1 except that the thickness of the colored layer 20 after drying was 2.5 μm. Regarding the formation of the colored layer 20, in Example 1, after printing the discharge amount of which the coating thickness after drying became 6 micrometers twice, the printing of the discharge amount which the coating thickness after drying became 3 micrometers was performed once. In Example 4, printing of the discharge amount which the application | coating thickness after drying becomes 2.5 micrometers was performed only once.

<Example 5>

The composite front plate of Example 5 was produced from the composite front plate 100 produced in Example 1 except that the thickness after drying of the colored layer 20 was 21 μm. Regarding the formation of the colored layer 20, in Example 1, after printing the discharge amount of which the coating thickness after drying becomes 6 micrometers twice, the printing of the discharge amount which the coating thickness after drying becomes 3 micrometers was performed once. In Example 5, after printing the discharge amount which the coating thickness after drying becomes 6 micrometers three times, the printing of the discharge amount which the coating thickness after drying becomes 3 micrometers was performed once.

[evaluation]

<Bubble at the time of bonding>

In the composite front plates of Examples 1 to 5, the surface on the display side coincides with each other, so that bubbles are not generated when the composite front plates are bonded to other members via an adhesive layer.

<Concave step of visual recognition side surface>

For the composite front plates of Examples 1 to 5, the viewing side surface was observed with an interferometer microscope (Bruker, Contour GT), and the height (maximum height and minimum height of the step between the display area and the non-display area where the colored layer was formed). Difference). In the composite front plates of Examples 1 to 4, no step was observed. That is, the height of the step was 0 (zero) µm. On the other hand, in the composite front plate of Example 5, the step | step which raised the non-display area compared with the display area was observed, and the height of the step | step was 4.6 micrometers. Table 1 shows the results of the evaluation.

<Measurement of Optical Density>

About the composite front plate of Examples 1-5, the area | region (non-display area) in which the colored layer 20 is formed was cut out to the magnitude | size of 117 mm x 154 mm, and it was set as the sample for optical density measurement. After setting this sample in the optical density measuring instrument (product name: 361T, the X-rite company), lighting the light source of the upper part of the visual side of a sample, focusing on the colored layer of a sample, and turning off the light source of the upper part, The lower light source located on the display side surface of the sample was turned on, and the optical density was measured using the colored layer as a measurement area. Table 1 shows the measurement results.

TABLE 1

[Test Examples 1-6]

<Test Example 1>

(Production of Optical Laminate)

The corona treatment was performed to the display side surface of the composite front plate of Example 1, and the surface of the side which a 3rd resin layer bonds. And each layer is laminated | stacked so that it may become "a composite front plate / adhesive layer / 3rd resin layer of Example 1", it bonds using a roll bonding machine, it cures in an autoclave, and the optical laminated body 202 shown in FIG. The optical laminated body of the test example 1 of the structure similar to the above was obtained.

<Test Example 2>

The same optical laminated body as the optical laminated body 202 of the test example 1 was produced, and after that, the resin composition for forming a second resin layer was applied to the visual side of the optical laminated body 202 and cured by ultraviolet irradiation. The same structure as the optical laminated body 203 shown in FIG. 5 which forms the 2nd resin layer of thickness 10micrometer, and consists of "a composite front plate / adhesive layer / 3rd resin layer of 2nd resin layer / Example 1". The optical laminated body of the test example 2 was obtained.

<Test Example 3>

460 mesh screen using the composition for color-containing layer formation (black) as ink so that it may become the same width as the colored layer 20 in the position corresponding to the colored layer 20 on the display side surface of the composite front plate of Example 1 By screen printing, printing of the discharge amount which the application | coating thickness after drying becomes 3 micrometers is performed once, and the shielding layer 25 which consists of a black printing layer of thickness 3 micrometers and width 25mm is formed in the perimeter of the periphery part. The optical laminated body 501 of the structure shown in FIG. 13 was obtained.

Corona treatment was performed to the display side surface of the obtained optical laminated body 501 and the surface of the side which a 3rd resin layer bonds. And each layer is laminated so that it may become an "optical laminated body 501 / adhesive layer / 3rd resin layer", it bonds using a roll bonding machine, it hardens in an autoclave, and the optical laminated body 503 shown in FIG. Got it.

The resin composition for forming a second resin layer is coated on the visual side of the obtained optical laminated body 503, cured by irradiating with ultraviolet rays, and a second resin layer having a thickness of 10 µm is formed to form a "second resin layer / optical laminate. (501) / adhesive layer / third resin layer ", the optical laminated body of the test example 3 of the structure similar to the optical laminated body 504 shown in FIG.

<Test Example 4>

The front plate which produced only the point which does not have the colored layer 20 from the composite front plate 100 produced in Example 1 was produced. Specifically, the thickness after drying the resin composition for forming a first resin layer (containing polyimide resin) on the surface of the base film 110 without performing the step of forming the colored layer 20 is 50 μm. It applied and prebaked at 80 degreeC for 30 minutes. Then, the base film 110 was peeled off, the display side surface 10b of the resin layer 10 was exposed, and it post-baked at 200 degreeC for 30 minutes, and the front plate used for the test example 4 was obtained.

On the display side surface of such a front plate, screen printing using the 460 mesh screen using the composition for colorant containing layer formation (black) as ink, prints the discharge amount which becomes 6 micrometers of coating thickness after drying, and the After the drying, the coating thickness after drying was printed once, and a printing amount of 3 μm was formed once, and a shielding layer 25 made of a black printed layer having a thickness of 15 μm and a width of 25 mm was formed on the entire circumference of the peripheral portion to obtain an optical laminate. .

Corona treatment was performed to the display side surface of the obtained optical laminated body and the surface of the side which a 3rd resin layer bonds. And each layer was laminated | stacked so that it might become "a front plate (the shielding layer is formed) / adhesive layer / 3rd resin layer", it was bonded together using a roll bonding machine, it cured in an autoclave, and the optical laminated body was obtained.

The resin composition for forming a second resin layer was applied to the visual side of the obtained optical laminate, cured by irradiating with ultraviolet rays to form a second resin layer having a thickness of 10 μm, and the second resin layer / front plate (shielding layer was Formed) / adhesive layer / third resin layer ”to obtain an optical laminate of Test Example 4. The optical laminated body of the test example 4 is a structure which does not have a colored layer.

<Test Example 5>

Only the thickness of the colored layer in a composite front plate differs from the optical laminated body of the test example 2. Specifically, in Test Example 2, the optical laminated body was produced using the composite front plate 100 of Example 1, whereas in Test Example 5, the optical laminated body was used using the composite front plate 100 of Example 5. Made.

<Test Example 6>

The thickness of the 1st resin layer 10 in the composite front plate, and the thickness of the colored layer 20 differ from the optical laminated body of the test example 3, and the thickness of the shielding layer 25 differs. Specifically, in Test Example 3, the optical laminated body was produced using the composite front plate 100 of Example 1, whereas in Test Example 6, the thickness of the first resin layer 10 was 60 μm, and the colored layer was used. The composite front plate whose thickness of (20) is 12 micrometers was used. At the time of preparation of a composite front plate, the colored layer 20 was formed by performing the printing of the discharge amount which will be 6 micrometers in coating thickness after drying twice.

A screen using a 460 mesh screen using a colorant-containing composition for forming a layer (black) as an ink at a position corresponding to the colored layer 20 on the display side surface of the composite front plate to have the same width as the colored layer 20. By printing, printing of the discharge amount which the application | coating thickness after drying becomes 6 micrometers is performed once, and the shielding layer 25 which consists of a black printing layer of thickness 6 micrometers and width 25mm is formed in the perimeter of the periphery part, and FIG. The optical laminated body 501 of the structure shown to was obtained.

Corona treatment was performed to the display side surface of the obtained optical laminated body 501 and the surface of the side which a 3rd resin layer bonds. And each layer is laminated | stacked so that it may become an "optical laminated body 501 / adhesive layer / 3rd resin layer", it bonds using a roll bonding machine, it hardens in an autoclave, and the optical laminated body 503 shown in FIG. Got it.

The resin composition for forming a second resin layer is coated on the visual side of the obtained optical laminated body 503, cured by irradiating with ultraviolet rays, and a second resin layer having a thickness of 10 µm is formed to form a "second resin layer / optical laminate. (501) / adhesive layer / third resin layer ", the optical laminated body of the test example 6 of the structure similar to the optical laminated body 504 shown in FIG.

[evaluation]

<Bubble on the adhesive layer surface>

About the optical laminated body of the test examples 1-6, the surface of the composite front plate side of an adhesive layer was observed with the optical microscope (made by Olympus), and the generation | occurrence | production of air bubbles was evaluated by the following references | standards. Table 2 shows the results of the evaluation.

A: No bubbles were observed,

B: Bubbles were observed only around the colored layer (non-display area).

C: Bubbles were observed around the colored layer (non-display area) and in other areas (display area).

<Concave step of visual recognition side surface>

About the optical laminated body of the test examples 1-6, the visual side surface was observed with the interferometer microscope (Bruker, Contour GT), and the height (maximum height and minimum height of the level | step difference between a display area and the non-display area in which the colored layer was formed) Difference). In the optical laminated body of the test examples 1-3, the level | step difference was not observed. That is, the height of the step was 0 (zero) µm. Table 2 shows the results of the evaluation.

<Measurement of Optical Density>

The area | region (non-display area) in which the colored layer 20 is formed from the optical laminated body of the test examples 1-6 was cut out to the magnitude | size of 117 mm x 154 mm, and it was set as the sample for optical density measurement. This sample is set in an optical density measuring instrument (product name: 361T, manufactured by X-rite), and the light source on the upper surface of the sample is turned on to light up the colored layer of the sample (if the shielding layer is formed, the colored layer and shielding). After focusing on a composite layer made of a layer, turning off the light source on the upper side, the lower light source located on the display side surface of the sample is turned on, and the colored layer (in case the shielding layer is formed, the colored layer and the shielding layer). Optical layer) was measured using a composite layer formed of the same as the measurement region. Table 2 shows the measurement results.

TABLE 2

10: first resin layer 20: colored layer
25: shielding layer 30: second resin layer
40: third resin layer 50, 51: bonding layer
60a, 60b, 60c: polarizer 70: touch sensor panel
81: liquid crystal display unit 82: organic EL display unit
90: backlight unit 100: composite front panel
100 ': composite faceplate sheet 100a: viewer side surface
100b: display side surface 110: base film
201, 202, and 203: optical laminate 300: image display
301 and 302: liquid crystal display device 303 and 304: organic EL display device
305 and 306: flexible display 400: display stack
501, 502, and 503: optical laminate A: display area
B: non-display area

Claims (10)

A composite front plate used by being disposed on the front side of an image display device,
It has a 1st resin layer and the colored layer provided in a part,
The visibility side surface is a plane comprised by the visibility side surface of the said 1st resin layer,
The display side surface is a flat front plate comprised from the display side surface of the said 1st resin layer, and the display side surface of the said colored layer. The method of claim 1,
The colored layer is a composite front plate containing a binder resin. The method according to claim 1 or 2,
When the thickness of the said 1st resin layer is a (micrometer) and the thickness of the said colored layer is b (micrometer), the thickness ratio T1 (%) computed by following formula (1) shows the relationship of following formula (2a) Satisfied composite faceplate.
T1 = b / a × 100 (1)
5≤T1≤42 (2a) The optical laminated body which has a composite front plate as described in any one of Claims 1-3, and the shielding layer laminated | stacked in the position corresponding to the said colored layer on the said display side surface of the said composite front plate. The method of claim 4, wherein
The optical laminated body whose thickness of the said shielding layer is 12 micrometers or less. The method according to claim 4 or 5,
The said optical laminated body is a following formula (3), when the thickness of the said 1st resin layer is a (micrometer), the thickness of the said colored layer is b (micrometer), and the thickness of the said shielding layer is c (micrometer). The optical laminated body in which the calculated thickness ratio T2 (%) satisfies the relationship of the following formula (4a).
T2 = (b + c) / a × 100 (3)
T2≥30 (4a) The composite front plate according to any one of claims 1 to 3,
The optical laminated body which has at least one of the 2nd resin layer laminated | stacked on the said viewer side surface of the said composite front plate, and the 3rd resin layer laminated | stacked on the said display side surface of the said composite front plate. The method of claim 7, wherein
The said 3rd resin layer laminated | stacked on the said display side surface of the said composite front plate via the adhesive layer,
The optical laminated body whose thickness of the said adhesive layer is 2 micrometers-25 micrometers. An image display device having the composite front plate according to any one of claims 1 to 3 disposed on the front side. As a manufacturing method of the composite front plate as described in any one of Claims 1-3,
Forming the colored layer on a part of the base film;
Applying the composition for resin layer forming, drying, and forming the said 1st resin layer on the said base film so that the visual recognition side surface of the said colored layer may be covered,
The manufacturing method which has a process of peeling the said base film.

Images