WO2014061478A1

WO2014061478A1 - Adhesive layer-equipped transparent surface material and display device

Info

Publication number: WO2014061478A1
Application number: PCT/JP2013/077142
Authority: WO
Inventors: 新山　聡
Original assignee: 旭硝子株式会社
Priority date: 2012-10-15
Filing date: 2013-10-04
Publication date: 2014-04-24
Also published as: TW201418038A; JPWO2014061478A1

Abstract

Provided is an adhesive layer-equipped transparent surface material that is suitable for protecting a display panel comprising a liquid crystal layer that is provided between transparent substrates and a transparent conductive layer that is provided on the surface of the viewing side of the transparent substrate that is more to the viewing side than the liquid crystal layer. The adhesive layer-equipped transparent surface material comprises a transparent surface material (10), an adhesive layer (14) that is formed on one surface of the transparent surface material (10), and a peelable protective film (16) that covers the surface of the adhesive layer (14) that is the opposite side from the transparent surface material (10) side, and is characterized in that the surface resistance value of the surface of the protective film (16) that is the opposite side from the adhesive layer (14) side is 1×10² to 1×10⁸Ω/□.

Description

Transparent surface material with adhesive layer and display device

The present invention relates to a transparent surface material with an adhesive layer that can be suitably used for protecting a display panel of a display device, and a display device including the transparent surface material.

As a method of protecting a display panel such as a liquid crystal display device with a transparent surface material (protective plate), the adhesive layer displays a transparent surface material with an adhesive layer in which an adhesive layer is formed on the surface of the transparent surface material, and the display panel. A method of bonding so as to be in contact with the panel is known (see Patent Document 1).
Usually, the size (area) of the transparent surface material is the same as or larger than that of the display panel so that the transparent surface material (protection plate) can protect the entire surface of the display panel.

In the liquid crystal display device, a liquid crystal layer is sandwiched between two opposing transparent substrates. An electrode for applying an electric field to the liquid crystal layer, wiring for driving the electrode, and the like are formed on one of the opposing transparent substrates, and a color filter is formed on the other transparent substrate.
There is a liquid crystal display device that does not require a liquid crystal driving electrode such as a common electrode on a transparent substrate on the color filter side, such as a horizontal electric field type (IPS type) liquid crystal display device. In such a liquid crystal display device, the transparent substrate on the color filter side is charged, and an unnecessary electric field may be generated. In order to reduce the influence of unnecessary electric fields on the liquid crystal, a transparent conductive layer such as ITO is formed on the surface of the transparent substrate on the viewing side (that is, on a surface different from the liquid crystal layer side), and the display panel A polarizing plate that is larger than the display surface and slightly smaller than the transparent substrate is pasted, and the transparent conductive layer in a region where the polarizing plate is not pasted is connected to, for example, a liquid crystal display via a conductive connecting member. A structure for electrically grounding a metal frame or the like of the apparatus is provided (for example, see Patent Document 2).

International Publication No. 2011/148990 Japanese Unexamined Patent Publication No. 2011-123231

In a horizontal electric field type (IPS type) liquid crystal display device, when a transparent surface material with an adhesive layer is bonded to a display panel, the transparent surface material is on the polarizing plate side of the viewing side of the transparent substrate on the color filter side. Will be stacked. Then, the transparent conductive material that is the same size as or larger than the display panel covers the entire surface of the transparent conductive layer exposed from the bonding region of the polarizing plate for grounding. It is difficult to provide a structure for grounding. Moreover, in the liquid crystal display device of the structure by which a transparent surface material is bonded, many things do not use a metal frame for the display surface side of a liquid crystal panel.

The present invention has been made in view of the above circumstances, and is a display panel in which a liquid crystal layer is provided between transparent substrates, and the transparent conductive layer is formed on the viewing side surface of the transparent substrate closer to the viewing side than the liquid crystal layer. An object of the present invention is to provide a transparent surface material with an adhesive layer suitable for protecting a display panel provided with the above, and a display device provided with the transparent surface material with an adhesive layer.

The transparent surface material with an adhesive layer of the present invention covers the transparent surface material, the adhesive layer formed on one surface of the transparent surface material, and the surface of the adhesive layer opposite to the transparent surface material side. A peelable protective film, and the protective film has a surface resistance value of at least a part of the surface opposite to the adhesive layer side of 1 × 10 ² to 1 × 10 ⁸ Ω / □. It is characterized by.

The transparent surface material has a light shielding portion formed at a peripheral edge portion of at least one surface and a light transmitting portion surrounded by the light shielding portion, and the protective film is from a normal direction of the transparent surface material. Accordingly, it is preferable that the frame-shaped remaining portion and the peeling portion surrounded by the remaining portion be separated or separable by a cut formed in the protective film at a portion overlapping the light shielding portion.
Here, the remaining part of the protective film preferably has a surface resistance value of 1 × 10 ² to 1 × 10 ⁸ Ω / □ on the surface opposite to the adhesive layer side. The protective film may have a surface resistance value of 1 × 10 ² to 1 × 10 ⁸ Ω / □ on the entire surface on the side opposite to the adhesive layer side.
The protective film comprises a laminate having one or more layers of a support material and a slightly adhesive layer, and the slightly adhesive layer is located on the outermost layer opposite to the adhesive layer side of the protective film, It is preferable that a conductive layer is provided between the support material closest to the slightly adhesive layer and the slightly adhesive layer. More preferably, the slightly adhesive layer itself has conductivity.
It is preferable that the transparent surface material is a protective plate of a display device.

A display device according to the present invention includes a display panel in which a liquid crystal layer is provided between a pair of transparent substrates, and a transparent surface material bonded via a pressure-sensitive adhesive layer on a surface on the viewing side of the display panel. Because
The outer periphery of the transparent surface material coincides with the outer periphery of the display panel or is located outside the outer periphery of the display panel, the display panel has a transparent conductive layer on the surface on the viewing side, and the transparent surface material However, it is made of the above-mentioned transparent surface material with an adhesive layer, and the remaining portion of the protective film is left, and the adhesive layer is bonded to the display panel so that the peeled portion is peeled off. It is characterized by being.
The transparent conductive layer on the viewing side surface of the display panel and the remaining portion having a surface resistance value of 1 × 10 ² to 1 × 10 ⁸ Ω / □ of the protective film are electrically connected. It is preferable. This display device is particularly suitable for a horizontal electric field type liquid crystal display panel such as an IPS mode.

According to the present invention, a part of the protective film of the transparent surface material with the adhesive layer is left, the other part is peeled off, and the remaining protective film and the display panel are bonded to the display panel of the display device. By electrically connecting the transparent conductive layer for grounding provided on the ground, a configuration for grounding the transparent conductive layer can be easily realized.

It is sectional drawing which shows an example of the transparent surface material with the adhesion layer of this invention. It is sectional drawing which shows typically the 1st example of the protective film used for the transparent surface material with the adhesion layer of FIG. It is sectional drawing which shows the 2nd example of a protective film typically. It is sectional drawing which shows the 3rd example of a protective film typically. It is a top view explaining the manufacturing process goods obtained in the step of the manufacturing process (a) of the transparent surface material with an adhesion layer. It is sectional drawing explaining the manufacturing process goods obtained at the step of the manufacturing process (a) of the transparent surface material with an adhesion layer. It is a top view explaining the manufacturing process (b) of a transparent surface material with an adhesion layer. It is sectional drawing explaining the manufacturing process (b) of a transparent surface material with an adhesion layer. It is sectional drawing explaining the manufacturing process (c) of a transparent surface material with an adhesion layer. It is sectional drawing which shows the example of the display apparatus using the transparent surface material with the adhesion layer of FIG. It is sectional drawing explaining the process (process S2) of bonding the display panel and the transparent surface material with the adhesion layer from which the peeling part of the protective film was peeled.

In this specification, “transparent” in the “transparent surface material” means that the surface material and the display surface of the display panel are bonded to each other without a gap through an adhesive layer, and then the whole or part of the display image of the display panel. Means a state that can be visually recognized through the face material without receiving optical distortion. Therefore, even if part of the light incident on the face material from the display panel is absorbed and reflected by the face material, or the visible material has a low visible ray transmittance due to a change in optical phase, the surface If the display image on the display panel can be viewed through the material without optical distortion, it can be said to be “transparent”. “(Meth) acrylate” means acrylate or methacrylate.

<Transparent surface material with adhesive layer>
FIG. 1 is a cross-sectional view showing an example of a transparent surface material with an adhesive layer of the present invention.
The transparent surface material 1 with an adhesive layer includes a protective plate (that is, a transparent surface material) 10, a light-shielding printing portion (that is, a light-shielding portion) 12 formed in a frame shape on the periphery of the surface of the protection plate 10, and light-shielding printing. It has the adhesion layer 14 formed in the surface of the protection board 10 in the side in which the part 12 was formed, and the peelable protective film (so-called protection material) 16 which covers the surface of the adhesion layer 14. FIG. In the protective plate 10, a region surrounded by the light shielding printing portion 12 where the light shielding printing portion 12 is not formed is a light transmitting portion 13 that transmits light.
The protective film 16 protects the surface of the pressure-sensitive adhesive layer 14, and normally maintains the shape of the pressure-sensitive adhesive layer 14 until just before the transparent surface material 1 with the pressure-sensitive adhesive layer is bonded to the display panel.
The protective film 16 is surrounded by a frame-like remaining portion 16b at the peripheral portion and the remaining portion 16b by a notch 16c formed in the portion of the protective film 16 that overlaps the light-shielding printed portion 12 when viewed from the normal direction of the protective plate 10. The separation part 16a is separated or separable.
The transparent surface material 1 with an adhesive layer can manufacture a display apparatus by peeling the peeling part 16a of the protective film 16, and bonding with a display panel.
The adhesive layer 14 may be formed on both surfaces of the transparent face material 1, and in that case, the surface of any adhesive layer 14 is covered with a protective film 16 that can be peeled off.

(Protective plate)
The protection plate 10 is provided on the image display surface side (viewing side) of the display panel described later to protect the display panel. Examples of the protective plate 10 include a glass plate or a transparent resin plate. The glass plate is not only highly transparent with respect to light emitted from and reflected from the display panel, but also has light resistance, low birefringence, high planar accuracy, surface scratch resistance, and high mechanical strength. Is most preferred. A glass plate is also preferred from the viewpoint of sufficiently transmitting light for curing the photocurable resin composition in the production process described later.

As a material of the glass plate, a glass material such as soda lime glass can be mentioned, and a high transmission glass (also referred to as white plate glass) having a lower iron content and less bluishness is more preferable. In order to improve safety, tempered glass may be used as the protective plate 10. In particular, when a thin glass plate is used, it is preferable to use a chemically strengthened glass plate. Examples of the material of the transparent resin plate include highly transparent resin materials (such as polycarbonate and polymethyl methacrylate).

The protective plate 10 may be subjected to a surface treatment in order to improve the interfacial adhesive force with the adhesive layer 14. Examples of the surface treatment include a method of treating the surface of the protective plate 10 with a silane coupling agent, a method of forming a silicon oxide thin film by an oxidation flame using a frame burner, and the like.

The protective plate 10 may be provided with an antireflection layer on the surface opposite to the side on which the adhesive layer 14 is formed in order to increase the contrast of the display image. Further, depending on the purpose, a part or the whole of the protective plate 10 is colored, or a part or the whole of the surface of the protective plate 10 is polished to form a glass to scatter light, or a part of the surface of the protective plate 10 is scattered. Alternatively, the transmitted light may be refracted or reflected by forming fine unevenness on the whole. Further, a colored film, a light scattering film, a photorefractive film, a light reflecting film, or the like may be attached to a part of or the entire surface of the protective plate 10.

The shape of the protection plate 10 is often rectangular in order to match the outer shape of the display device, but each corner of the rectangle is curved, the entire protection plate is configured by a curve, or an asymmetric shape. You may make it easy to arrange | position to the housing of a display apparatus, improving designability.
The size of the protective plate 10 may be equal to or larger than that of the display panel, and may be appropriately set according to the outer shape of the display device. In the case of a glass plate, the thickness of the protective plate 10 is preferably 0.5 to 25 mm from the viewpoint of mechanical strength and transparency. For applications such as television receivers and PC displays used indoors, 1 to 6 mm is preferable from the viewpoint of reducing the weight of the display device, and for public display applications installed outdoors, 3 to 20 mm is preferable. When chemically strengthened glass is used, the thickness of the glass plate is preferably about 0.5 to 1.5 mm in terms of strength. In the case of a transparent resin plate, 2 to 10 mm is preferable.

(Shading printing part)
The light-shielding printing part (light-shielding part) 12 hides the wiring members and the like connected to the display panel so that areas other than the image display area of the display panel to be described later cannot be seen from the protective plate 10 side. The light-shielding printing unit 12 can be formed on the surface of the protective plate 10 on which the adhesive layer 14 is formed or on the opposite surface. In terms of reducing the parallax between the light-shielding printing unit 12 and the image display area, it is preferable to form the surface on the side where the adhesive layer 14 is formed. When the protective plate 10 is a glass plate, it is preferable to use a ceramic printing ink containing a black pigment for the light shielding printing portion 12 because of high light shielding properties. An organic ink containing a white pigment can also be used depending on the design of the casing in which the display panel is provided.
When the display panel wiring member or the like is not visible from the display panel viewing side or is concealed by another member such as a housing of the display device, the light shielding printing portion is not formed on the protective plate 10. In some cases.

(Adhesive layer)
The adhesive layer 14 includes a layered portion 18 that extends along the surface of the protective plate 10 and a weir-shaped portion 20 that surrounds the layered portion 18 in a form in contact with the periphery of the layered portion 18. By having the weir-like portion 20 in the pressure-sensitive adhesive layer 14, it is possible to prevent the peripheral portion of the layer-like portion 18 from spreading outward and to reduce the thickness of the peripheral portion, and to keep the entire thickness of the layer-like portion 18 uniform. it can. By making the entire thickness of the layered portion 18 uniform, it is preferable to easily suppress a void from remaining at the interface in bonding with another face material (that is, an object to be bonded).

In the adhesive layer 14, the thickness of the weir 20 is thicker than the thickness of the layer 18. Even if the surface of the layer-shaped portion 18 is not flat and the thickness of the layer-shaped portion 18 is not constant, the thickness of the weir-shaped portion 20 is at least part of the region where the weir-shaped portion 20 is adjacent to the layer-shaped portion 18. The thickness is preferably larger than the thickness of the layered portion 18.

(Layered part)
The layered portion 18 is a layer made of a transparent resin obtained by curing a liquid curable resin composition for forming a layered portion (hereinafter referred to as a first composition).

The shear modulus at 25 ° C. of the layered portion 18 is preferably 10 ³ to 10 ⁷ Pa, and more preferably 10 ⁴ to 10 ⁶ Pa. Furthermore, 10 ⁴ to 10 ⁵ Pa is particularly preferable in order to eliminate the void at the time of bonding in a shorter time. If the shear modulus is 10 ³ Pa or more, the shape of the layered portion 18 can be maintained. Moreover, even when the thickness of the layered portion 18 is relatively thick, the thickness can be maintained uniformly throughout the layered portion 18, and when the transparent surface material 1 with the adhesive layer and the display panel are bonded, a display is performed. It is difficult for voids to occur at the interface between the panel and the adhesive layer 14. Moreover, when the shear modulus is 10 ⁴ Pa or more, it is easy to suppress deformation of the layered portion when a protective film described later is peeled off. If the shear modulus is 10 ⁷ Pa or less, the layered portion 18 can exhibit good adhesion when bonded to a display panel. Moreover, since the molecular mobility of the resin material forming the layered portion 18 is relatively high, after bonding the display panel and the transparent surface material 1 with the adhesive layer in a reduced-pressure atmosphere, this is returned to the atmospheric pressure atmosphere. The volume of the void is likely to decrease due to the pressure difference between the pressure in the void (pressure in a state of reduced pressure) and the pressure applied to the layered portion 18 (that is, atmospheric pressure), and the volume has decreased. The gas in the gap is easily dissolved in the layered portion 18 and absorbed.

The thickness of the layered portion 18 is preferably 0.03 to 2 mm, and more preferably 0.1 to 0.8 mm. If the thickness of the layered portion 18 is 0.03 mm or more, the layered portion 18 can effectively buffer an impact caused by an external force from the protective plate 10 side, and the display panel can be protected. Moreover, in the manufacturing method of the display apparatus of this embodiment, even if the foreign material which does not exceed the thickness of the layered part 18 mixes between the display panel and the transparent surface material 1 with the adhesion layer, the thickness of the layered part 18 is reduced. There is little influence on the light transmission performance without much change. If the thickness of the layered portion 18 is 2 mm or less, it is difficult for voids to remain in the layered portion 18, and the entire thickness of the display device does not become unnecessarily thick. Examples of a method for adjusting the thickness of the layered portion 18 include a method of adjusting the thickness of the weir-shaped portion 20 and adjusting the supply amount of the liquid first composition supplied to the surface of the protective plate 10. .

(Weir)
The weir-like portion 20 is a portion made of a transparent resin obtained by applying and curing a liquid curable resin composition for forming a weir-like portion (hereinafter referred to as a second composition). Since the area outside the image display area of the display panel is relatively narrow, the width of the weir 20 is preferably narrow. The width of the weir 20 is preferably 0.5 to 2 mm, and more preferably 0.8 to 1.6 mm. Further, the thickness of the dam-like portion 20 is substantially equal to the average thickness of the layer-like portion excluding the region where the dam-like portion and the layer-like portion are close to each other, or, as described above, 0.0. The thickness is preferably 005 to 0.05 mm, more preferably 0.01 to 0.03 mm.

The shear elastic modulus at 25 ° C. of the weir-shaped portion 20 is preferably larger than the shear elastic modulus at 25 ° C. of the layered portion 18. If the shear elastic modulus of the weir-like part 20 is larger than the shear elastic modulus of the layered part 18, the display panel is attached to the peripheral part of the adhesive layer 14 when the display panel and the transparent surface material 1 with the adhesive layer are bonded. Even if voids remain at the interface between the adhesive layer 14 and the adhesive layer 14, the voids are not easily opened to the outside, and are easily formed as independent voids. Therefore, after pasting the display panel and the transparent surface material 1 with the adhesive layer in a reduced pressure atmosphere, when the pressure is returned to the atmospheric pressure atmosphere, the pressure in the gap (that is, the pressure in the reduced pressure state). ) And the pressure applied to the pressure-sensitive adhesive layer 14 (that is, atmospheric pressure), the volume of the void is reduced and the void is likely to disappear.
Further, the thickness of the dam-like portion is determined in at least a part of the region where the dam-like portion 20 is adjacent to the layer-like portion 18 by making the shear modulus of the dam-like portion 20 larger than the shear elastic modulus of the layer-like portion 18. It becomes easy to manufacture the transparent surface material 1 with the adhesion layer which is larger than the thickness of the layered portion.

As will be described later, by providing a protective film 16 having a high gas barrier property on the transparent face material 1 with an adhesive layer, outside air (for example, oxygen, nitrogen, water vapor, etc.) permeates the protective film 16 during storage and adheres. Mixing and dissolution in the layer 14 can be suppressed.

(Protective film)
(First example)
FIG. 2 is a cross-sectional view schematically showing a protective film 16 </ b> A that is a first example of the protective film 16. The illustration of the cut 16c is omitted (hereinafter the same applies to FIGS. 3 and 4).
The protective film 16A includes a first support material 3, a barrier layer (that is, a gas barrier layer) 4 formed over the entire upper surface 3a, a second support material 5 laminated on the upper surface 4a of the barrier layer 4, and a second The third support member 7 laminated on the upper surface 5a of the support member 5 via the adhesive layer 6, the conductive layer 9 formed on the upper surface 7a of the third support member 7, and the upper surface 9a of the conductive layer 9 were formed. A slightly adhesive layer 8.

The first support material 3 is used by bringing the lower surface 3b into contact with the adhesive layer 14, and is preferably a film made of a resin such as polyethylene, polypropylene, or a fluorine resin. In particular, use of a polyolefin-based resin (polyethylene, polypropylene, etc.) is preferable because peeling from the adhesive layer 14 becomes easy.
The preferred thickness of the first support member 3 varies depending on the material, but when a relatively flexible film such as polyethylene or polypropylene is used, it is preferably 0.02 to 0.2 mm. When the thickness is 0.02 mm or more, excessive deformation of the protective film 16A can be suppressed when the protective film 16A is peeled from the adhesive layer 14. If the thickness of 16 A of protective films is 0.2 mm or less, the protective film 16 will bend easily at the time of peeling, and the operation to peel can be made easy.
It is preferable that the first support material 3 has a self-adhesive layer on its upper surface, which can be easily bonded to the barrier layer 4 formed on the second support material 5.

On the lower surface 3b of the first support material 3, when the adhesive layer 14 is easily peeled off, or when bonded to the display panel, voids formed at the interface between the display panel and the adhesive layer are rapidly disappeared. Therefore, the surface may be roughened. At this time, the lower surface 3b preferably has a rough surface structure with a ten-point average roughness Rz defined by the standard of JIS B0601 (2001) of 2.0 to 20 μm.
The ten-point average roughness Rz of the lower surface 3b is more preferably 2.0 to 10 μm, and further preferably 2.0 to 6 μm. Since the lower surface 3b has a rough surface structure having Rz in the above-described range, the upper surface of the adhesive layer 14 on the protective film 16 side can be easily formed into a rough surface structure following the rough surface structure of the lower surface 3b. The arithmetic average roughness Ra of the lower surface 3b is preferably 0.2 to 1.0 μm.
By bonding another layer capable of forming a rough surface structure to the lower surface 3b of the first support member 3, the rough surface structure can be provided on the surface opposite to the slightly adhesive layer 8 of the protective film 16A. For example, it is preferable to form a rough surface structure on the lower surface 3b of the first support material 3 made of polypropylene by a polymer blend layer made of polypropylene and polyethylene, both of which are polyolefin-based, because peeling from the adhesive layer 14 is easy.
Further, a back layer can be provided on the lower surface 3b to facilitate peeling from the adhesive layer. For the back layer, it is preferable to use a film having relatively low adhesion, such as polyethylene, polypropylene, and fluorine resin. In order to facilitate peeling, a release agent such as silicone may be applied to the lower surface 3b or the back layer as long as the adhesive layer 14 is not adversely affected.

The barrier layer 4 (that is, the gas barrier layer) is a layer that prevents gas (for example, oxygen gas, nitrogen gas, water vapor, etc.) from the outside from passing through the protective film 16 and mixing into the adhesive layer 14. It is preferably made of a gas permeable material. The gas permeability can be used as a measure by measuring “oxygen permeability” according to the standard of JIS K 7126. The “oxygen permeability” of the protective film 16 on which the barrier layer 4 is formed is preferably 100 cc / m ² · day · atm or less.
Thus, after the transparent surface material 1 with the adhesive layer is manufactured and before it is used, that is, after the transparent surface material with the adhesive layer is manufactured, the display of the display device is manufactured for manufacturing the display device. It is possible to prevent outside air from passing through the protective film 16 and being mixed into the adhesive layer 14 until the panel is bonded to the transparent surface material with the adhesive layer.

The material of the barrier layer 4 is not particularly limited as long as a predetermined oxygen permeability can be obtained. For example, inorganic compounds such as oxides, nitrides, sulfides, carbides, clay-based materials, inorganic compounds, or composites of clay and resin The body is preferred.
Specifically, clay crystals of silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), silicon nitride, silicon oxynitride, aluminum oxynitride, magnesium oxide, zinc oxide, indium oxide, tin oxide, and layered silicate In particular, silicon oxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) are preferable.

When the barrier layer 4 has a thickness of 0.01 μm or more (preferably 0.02 to 2 μm), the gas barrier property can be improved, which is preferable.

The second support material 5 and the third support material 7 are preferably films made of a polyester resin excellent in gas barrier properties, particularly polyethylene terephthalate (hereinafter referred to as PET). As the polyester resin, polyethylene naphthalate (PEN) can be used in addition to PET.
In addition, polyamide resins such as nylon-6 and nylon-66 can be used. Polyvinyl alcohol may also be used.

The thickness of the second support material 5 and the third support material 7 is preferably 5 to 50 μm when a film made of polyester resin such as PET is used. If this thickness is 5 μm or more, the gas barrier property can be improved, and if it is 50 μm or less, the protective film 16 is easily bent at the time of peeling, and the peeling operation can be facilitated.

For the adhesive layer 6 (which may be an adhesive layer), acrylic, rubber, silicone, urethane adhesives and adhesives can be used.

The conductive layer 9 may be any layer as long as it can provide a desired surface resistance to the surface of the protective film 16 opposite to the adhesive layer 14 side. Examples of the material for forming the conductive layer 9 include metals such as gold and nickel; metal oxides such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide) and tin oxide; conductive polymers and organometallic complexes. An organic conductive material etc. are mentioned. When the short-wavelength visible light or ultraviolet light is used in forming the adhesive layer 14, the conductive layer 9 preferably has transparency to the wavelength. In particular, metal oxides such as ITO and tin oxide are preferable.
The method for forming the conductive layer 9 is not particularly limited, and the conductive layer 9 can be formed on the surface of the third support material 7 by vapor deposition, sputtering, plasma CVD, sol-gel method, wet method, or the like.

The slight adhesion layer 8 is a film that attaches the protective film 16A to a support surface material 10 described later in a peelable manner, and for example, an acrylic or styrene adhesive material, ethylene vinyl acetate resin, or the like can be used.
The adhesive strength of the adhesive surface of the slightly adhesive layer 8 is preferably 0.02 to 0.2 N, preferably 0.04 to 0 in a 25 mm wide specimen in a 180 ° peel test with a peel speed of 300 mm / min. More preferred is 1N. When the adhesive strength is 0.02 N or more, it is possible to adhere to the support surface material 10, and when it is 0.2 N or less, it is easy to peel the protective film 16 from the support surface material 10.
The support surface material 10 is used to hold the protective film 16A in the process of overlaying and adhering the protective film 16A to the adhesive layer 14 in the display device manufacturing method described later.

The slightly adhesive layer 8 has a surface resistance value on the surface opposite to the adhesive layer 14 side of the protective film 16, that is, the surface on the slightly adhesive layer 8 side, in a state where the slightly adhesive layer 8 exists on the conductive layer 9. It is sufficient that the desired value is obtained and a desired adhesive strength is obtained. The slight adhesion layer 8 may be provided uniformly on the entire surface of the protective film 16A or may be provided partially. In terms of easily increasing the surface resistance value on the surface on the side of the slightly adhesive layer 8, it is preferable to partially provide the slightly adhesive layer 8, for example, in the form of dots.
For example, when the uniform fine adhesive layer 8 is provided on the entire surface of the protective film 16A, the thickness is preferably 0.1 to 10 μm, more preferably 0.5 to 5 μm, although it depends on the material.
Further, it is more preferable that the slightly adhesive layer has conductivity, and in that case, a thicker slightly adhesive layer may be used.

The protective film 16 has a surface resistance value of 1 × 10 ² to 1 × 10 ⁸ Ω / □ on the surface opposite to the adhesive layer 14 side.
When the surface resistance value is less than or equal to the upper limit of the above range, when the peeled portion 16a of the protective film 16 is peeled and then bonded to a display panel having a transparent conductive layer for grounding, the transparent conductive material for grounding is used. The layer and the remaining portion 16b of the protective film 16 can be electrically connected. By doing so, a configuration for grounding can be realized. If the surface resistance value is lower than the above range, it is necessary to increase the thickness of the conductive layer, and the second support material 5 may be deformed by heat during the formation of the conductive layer.
The surface resistance value is more preferably 1 × 10 ³ to 1 × 10 ⁶ Ω / □.
In the present specification, the surface resistance value is a value obtained by measurement by a four-terminal method.
Moreover, in this invention, at least one part of the surface of the remaining part except the peeling part of the protective film of a protective film should just be in the range of the said surface resistance value, and the conductive layer is formed in the said part Is preferred. The entire surface of the remaining portion 16b is preferably in the range of the resistance value, and the entire surface of the protective film 16 may be in the range of the resistance value.

As will be described later, when the pressure-sensitive adhesive layer 14 is made of a photocurable composition and the photocurable resin composition is cured by irradiating visible light or ultraviolet light having a short wavelength through the protective film 16, the protective film 16. Needs to be sufficiently transparent to the irradiation light.
For example, the transmittance of ultraviolet rays (wavelength 360 nm) is preferably 30% or more.
The thickness of the protective film 16 is not specifically limited, It can be set as the sum total of the preferable thickness of each layer. It is preferable that the total thickness of layers such as a polarizing plate existing on the viewer side of the transparent conductive layer for grounding in the display panel to be bonded to the transparent surface material 1 with the adhesive layer is not exceeded.

In this embodiment, the pressure-sensitive adhesive layer 14 is made of a photocurable composition. However, when a thermosetting composition or the like is used for the pressure-sensitive adhesive layer 14, it is not necessary to irradiate light through the protective film 16. A low protective material (for example, one having a foil material made of metal such as aluminum) may be used.

The protective film 16A can be produced, for example, by the following method.
On the second support material 5 on which the barrier layer 4 is formed, the third support material 7 on which the conductive layer 9 is formed is laminated via the adhesive layer 6 by a technique such as dry lamination or wet lamination. Next, the first support material 3 is laminated on the laminate by the self-adhesive layer formed on the upper surface 3 a of the first support material 3 or heat fusion, and the fine adhesion layer 8 is formed on the upper surface 9 a of the conductive layer 9. Thus, the protective film 16A shown in FIG. 2 is obtained.
The formation method of the barrier layer 4 is not particularly limited, and the barrier layer 4 may be formed on the surface of the second support material 5 (or the first support material 3) by a wet method such as vapor deposition, sputtering method, plasma CVD method, sol-gel method, or the like. it can.

(Second example)
FIG. 3 is a cross-sectional view schematically showing a protective film 16 </ b> B that is a second example of the protective film 16. In the following description, parts common to the protective film 16A of the first example are denoted by the same reference numerals and description thereof is omitted.
The protective film 16B is formed on the first support member 3, the barrier layer 4 formed on the upper surface 3a thereof, the second support member 5 laminated on the upper surface 4a of the barrier layer 4, and the upper surface 5a of the second support member 5. The conductive layer 9 is formed, and the slightly adhesive layer 8 is formed on the upper surface 9 a of the conductive layer 9.
The protective film 16B can be produced, for example, by the following method.
A second support material 5 having a barrier layer 4 formed on one surface and a conductive layer 9 formed on the other surface is first bonded by a self-adhesive layer formed on the upper surface 3a of the first support material 3 or heat fusion. By laminating the barrier layer 4 so as to contact the upper surface 3a of the support material 3 and forming the slightly adhesive layer 8 on the upper surface 9a of the conductive layer 9, a protective film 16B is obtained.

(Third example)
FIG. 4 is a cross-sectional view schematically showing a protective film 16 </ b> C that is a third example of the protective film 16.
The protective film 16 </ b> C includes the first support material 3, the conductive layer 9 formed on the upper surface 3 a, and the slightly adhesive layer 8 formed on the upper surface 9 a of the conductive layer 9.
The protective film 16C can be produced, for example, by the following method.
The protective film 16C is obtained by forming the slightly adhesive layer 8 on the upper surface 9a of the conductive layer 9 formed on the upper surface 3a of the first support material 3.
In the first to third examples, the case where the entire surface of the protective film opposite to the surface facing the adhesive layer has a surface resistance value of 1 × 10 ² to 1 × 10 ⁸ Ω / □ has been described. In the invention, only a protective film having a conductive layer formed so that only the peripheral edge portion, that is, the remaining portion has such a surface resistance value may be used.

[Method for producing transparent surface material with adhesive layer]
The method for producing a transparent surface material with an adhesive layer of the present embodiment is a method having the following steps (a) to (f) in this order.
(A) A step of forming a weir-like portion by applying the second composition to the peripheral portion of the surface of the transparent face material.
(B) The process of supplying a liquid 1st composition to the area | region enclosed by the weir-like part.
(C) In a reduced pressure atmosphere of 1 kPa or less, a support surface material on which a protective film is attached is stacked on the first composition so that the protective film is in contact with the first composition, The process of obtaining the laminated body by which the uncured layered part which consists of a 1st composition was sealed with the protective film and the dam-like part.
(D) A step of curing the uncured layered portion in a state where the laminate is placed under a pressure atmosphere of 50 kPa or more to form an adhesive layer having the layered portion and the weir-shaped portion.
(E) The process of peeling a support surface material from a protective film.
(F) Before the step (c) or after the step (e), a cut is formed in the protective film, and the protective film is separated into a remaining portion of the peripheral portion and a peeling portion surrounded by the remaining portion, or The process of making it separable.

Hereinafter, step (a) to step (f) will be described in detail.
(Process (a))
First, the second composition is applied to the peripheral portion of the surface of the transparent face material to form a weir-like portion.
The application is performed using a printing machine, a dispenser, or the like. The weir-like portion may be in an uncured state or may be in a cured or semi-cured state. When the second composition is a photocurable composition, the weir-shaped portion is cured by light irradiation. For example, the photocurable resin composition is cured by irradiating ultraviolet light or short wavelength visible light from a light source (ultraviolet lamp, high pressure mercury lamp, UV-LED, etc.).

The viscosity of the second composition is preferably 500 to 3,000 Pa · s, more preferably 800 to 2,500 Pa · s, and still more preferably 1,000 to 2,000 Pa · s. If the viscosity is 500 Pa · s or more, the shape of the uncured weir can be maintained for a relatively long time, and the height of the uncured weir can be sufficiently maintained. If the viscosity is 3,000 Pa · s or less, an uncured weir can be formed by coating.
In addition, even when the viscosity of the second composition forming the weir-like portion is less than 500 Pa · s, if the second composition is a photocurable composition, light is applied immediately after the application. The viscosity of the second composition after the light irradiation may be set to the above-described preferable range. From the viewpoint of ease of application, the viscosity at the time of application of the second composition is preferably 500 Pa · s or less, and more preferably 200 Pa · s or less.
In addition, the viscosity of a 2nd composition and the 1st composition mentioned later in this specification says what was measured using the E-type viscosity meter at 25 degreeC.

The second composition may be a photocurable resin composition or a thermosetting resin composition. As the second composition, it can be cured at a low temperature and has a high curing rate, and the second composition having a low viscosity can be increased in viscosity by light irradiation immediately after coating, so that the curable compound and the photopolymerization initiator ( A photocurable resin composition containing C) is preferred.

As the second composition, the oligomer (A) having a curable group and having a number average molecular weight of 30,000 to 100,000 is used as the curable compound because the viscosity is easily adjusted to the above range. Including one or more kinds and one or more kinds of monomers (B) having a curable group and a molecular weight of 125 to 600, and the ratio of the monomers (B) is such that the oligomer (A) and the monomer (B) Of the total (100% by mass) is preferably 15 to 50% by mass. When the viscosity is adjusted to the above range by light irradiation immediately after coating, the proportion of the monomer (B) is 30 to 70 in the total (100% by mass) of the oligomer (A) and the monomer (B). What is mass% is preferable.

Examples of the curable group of the oligomer (A) include addition polymerizable unsaturated groups (acryloyloxy group, methacryloyloxy group, etc.) or combinations of unsaturated groups and thiol groups.
A group selected from an acryloyloxy group and a methacryloyloxy group is preferable from the viewpoint that a curing rate is high and a highly transparent weir-like part is obtained.
The oligomer (A) preferably has an average of 1.8 to 4 curable groups per molecule from the viewpoint of curability of the photocurable resin composition for forming the weir-like portion and mechanical properties of the weir-like portion. . Examples of the oligomer (A) include urethane oligomers having a urethane bond, poly (meth) acrylates of polyoxyalkylene polyols, poly (meth) acrylates of polyester polyols, and the like. The urethane oligomer (A1) is preferable from the viewpoint that the mechanical properties, the adhesiveness to the transparent surface material or the display panel can be adjusted widely.

Examples of the curable group of the monomer (B) include addition polymerizable unsaturated groups (acryloyloxy group, methacryloyloxy group and the like), a combination of an unsaturated group and a thiol group, and the like. A group selected from an acryloyloxy group and a methacryloyloxy group is preferable from the viewpoint that a curing rate is high and a highly transparent weir-like part is obtained.
The monomer (B) preferably contains a monomer (B3) having a hydroxyl group from the viewpoint of adhesion between the transparent surface material or the display panel and the weir-like part and solubility of various additives described later. Examples of the monomer (B3) having a hydroxyl group include a hydroxy acrylate having a hydroxyalkyl group having 1 to 2 hydroxyl groups and 3 to 8 carbon atoms, or hydroxy methacrylate (2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4- Hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 4-hydroxybutyl methacrylate, 6-hydroxyhexyl methacrylate, etc.), preferably 4-hydroxybutyl acrylate or 2-hydroxybutyl Methacrylate is particularly preferred. Monomer (B) may be used alone or in combination of two or more.

Examples of the photopolymerization initiator (C) include acetophenone series, ketal series, benzoin or benzoin ether series, phosphine oxide series, benzophenone series, thioxanthone series, and quinone series. By using two or more kinds of photopolymerization initiators (C) having different absorption wavelength ranges in combination, the curing time can be further increased, or the surface curability of the weir-like portion can be increased. When adjusting the viscosity of the second resin composition to the above-mentioned preferable range by light irradiation immediately after coating, it is particularly preferable to use two or more photopolymerization initiators (C) having different absorption wavelength ranges.

(Process (b))
After the step (a), the liquid first composition is supplied to a region surrounded by the weir-shaped portion.
The supply amount of the first composition is such that a space formed by the weir-shaped portion, the transparent surface material, and the protective film is filled with the first composition, and the space between the transparent surface material and the protective film is a predetermined interval ( That is, the amount is set in advance so that the layered portion has a predetermined thickness. At this time, it is preferable to consider in advance volume reduction due to cure shrinkage of the first composition. Therefore, the amount is preferably such that the thickness of the supplied liquid first composition is slightly larger than the predetermined thickness of the layered portion formed by curing.
Examples of the supply method include a method in which a transparent surface material is placed flat and is supplied in a dot shape, a linear shape, or a planar shape by a supply means such as a dispenser or a die coater.

The viscosity of the first composition is preferably 0.05 to 50 Pa · s, more preferably 1 to 20 Pa · s. When the viscosity is 0.05 Pa · s or more, the proportion of the monomer (B ′) described later can be suppressed, and the decrease in physical properties of the layered portion can be suppressed. Moreover, since the component having a low boiling point is reduced, volatilization in a reduced-pressure atmosphere described later is suppressed, which is preferable. If the viscosity is 50 Pa · s or less, voids hardly remain in the layered portion.
The viscosity of the first composition is measured using an E-type viscometer at 25 ° C.

The first composition may be a photocurable resin composition or a thermosetting resin composition. As the first composition, a photocurable resin composition containing a curable compound and a photopolymerization initiator (C ′) is preferable because it can be cured at a low temperature and has a high curing rate.

As the photocurable resin composition for forming a layered portion, the curable compound has a curable group and has a number average molecular weight of 1,000 to 100,000 because the viscosity is easily adjusted to the above range. Including at least one oligomer (A ′) and at least one monomer (B ′) having a curable group and a molecular weight of 125 to 600, the proportion of the monomer (B ′) being an oligomer Of the total (100% by mass) of (A ′) and the monomer (B ′), those of 40 to 80% by mass are preferable.

Examples of the curable group of the oligomer (A ′) include addition polymerizable unsaturated groups (acryloyloxy group, methacryloyloxy group, etc.), or a combination of an unsaturated group and a thiol group. And the group chosen from an acryloyloxy group and a methacryloyloxy group from the point from which a highly transparent layered part is obtained is preferable.

Examples of the curable group of the monomer (B ′) include addition-polymerizable unsaturated groups (acryloyloxy group, methacryloyloxy group, etc.) or combinations of unsaturated groups and thiol groups. And the group chosen from an acryloyloxy group and a methacryloyloxy group from the point from which a highly transparent layered part is obtained is preferable.
The monomer (B ′) is preferably one having 1 to 3 curable groups per molecule from the viewpoint of curability of the photocurable resin composition for forming a layered portion and mechanical properties of the layered portion.

Examples of the photopolymerization initiator (C ′) include acetophenone series, ketal series, benzoin or benzoin ether series, phosphine oxide series, benzophenone series, thioxanthone series, and quinone series.

(Process (c))
After the step (b), the transparent surface material supplied with the first composition is put into a decompression device, and the transparent surface material is placed so that the surface of the first composition is on the fixed support disk in the decompression device. Lay flat.
A movement support mechanism that can move in the vertical direction is provided in the upper part of the decompression device, and a support surface material (for example, a glass plate) is attached to the movement support mechanism. A protective film is adhered to the lower surface of the support surface material by the slightly adhesive layer 8.
The supporting face material is placed at a position above the transparent face material and not in contact with the first composition. That is, the first composition on the transparent face material and the protective film on the surface of the support face material are opposed to each other without being brought into contact with each other.

After placing the transparent face material and the support face material at predetermined positions, the inside of the pressure reducing device is depressurized to obtain a predetermined reduced pressure atmosphere. After the inside of the decompression device becomes a predetermined decompressed atmosphere, the support surface material supported by the moving support mechanism is moved downward, and the protective film is adhered on the first composition on the transparent surface material. The supporting surface materials are overlapped so that the protective film is in contact with the first composition.

By the overlapping, the first composition is sealed in the space surrounded by the surface of the transparent surface material, the surface of the protective film adhered to the support surface material, and the weir-like portion.
At the time of superposition, the first composition is expanded by the weight of the support surface material, the pressure from the moving support mechanism, etc., the first composition fills the space, and an uncured layered portion is formed. . Thereafter, when exposed to a high pressure atmosphere in the step (d), an uncured layered portion with few or no voids is formed.

The reduced pressure atmosphere at the time of superposition is 1 kPa or less, preferably 10 to 300 Pa, more preferably 15 to 100 Pa. If the reduced-pressure atmosphere is extremely low pressure, each component (curable compound, photopolymerization initiator, polymerization inhibitor, chain transfer agent, light stabilizer, etc.) contained in the first composition may be adversely affected. For example, if the reduced-pressure atmosphere is extremely low pressure, each component may be vaporized, and it may take time to provide the reduced-pressure atmosphere.

The time from when the transparent surface material and the support surface material are overlapped to the time when the reduced pressure atmosphere is released is not particularly limited, and the reduced pressure atmosphere may be released immediately after sealing the first composition. After sealing the object, the reduced pressure state may be maintained for a predetermined time.

(Process (d))
After releasing the reduced pressure atmosphere in the step (c), the laminate is placed in a pressure atmosphere having an atmospheric pressure of 50 kPa or more.
When the laminated body is placed in a pressure atmosphere of 50 kPa or more, the transparent surface material and the support surface material are pressed in a direction in close contact with the increased pressure. Therefore, if there is a void in the sealed space in the laminate, the uncured layered portion flows in the void, and the entire sealed space is uniformly filled with the uncured layered portion.

The time from when the laminate is placed in a pressure atmosphere of 50 kPa or more to the start of curing of the uncured layered portion (hereinafter referred to as high pressure holding time) is not particularly limited. When the process from taking out the laminated body from the decompression device to the curing device and starting the curing is performed under an atmospheric pressure atmosphere, the time required for the process becomes the high pressure holding time. Therefore, if there are no voids already in the sealed space of the laminate when placed in an atmospheric pressure atmosphere, or if the voids disappear during the process, the uncured layered part can be cured immediately. it can. When it takes time for the voids to disappear, the laminate is held in an atmosphere at a pressure of 50 kPa or more until the voids disappear. In addition, since there is usually no problem even if the high pressure holding time is increased, the high pressure holding time may be increased due to other necessity in the process. The high-pressure holding time may be a long time of one day or longer, but is preferably within 6 hours from the viewpoint of production efficiency, more preferably within 1 hour, and particularly within 10 minutes from the viewpoint of further increasing production efficiency. preferable.

Next, an uncured layered portion and an uncured or semi-cured weir-shaped portion are cured to form an adhesive layer having the layered portion and the weir-shaped portion. At this time, the uncured or semi-cured weir-shaped portion may be cured simultaneously with the curing of the uncured layered portion, or may be cured in advance before the uncured layered portion is cured.

When the uncured layered portion and the uncured or semi-cured weir-shaped portion are made of a photocurable composition, they are cured by irradiation with light. For example, the photocurable resin composition is cured by irradiating ultraviolet light or short wavelength visible light from a light source (ultraviolet lamp, high pressure mercury lamp, UV-LED, etc.). When a light-shielding printing part is formed on the peripheral edge of the transparent surface material, or a transparent resin film on which an antireflection layer is provided on the transparent surface material and an antireflection layer is formed, or the antireflection film and its transparent When an adhesive layer or the like provided between the face material does not transmit ultraviolet rays, light is irradiated from the support face material side.

(Process (e))
By peeling the supporting face material from the protective film, an adhesive layer having sufficient adhesive strength was previously formed on the transparent face material, and the generation of voids at the interface between the transparent face material and the adhesive layer was sufficiently suppressed. A transparent surface material with an adhesive layer is obtained.

(Process (f))
Before step (c) or after step (e), a cut is formed in the protective film with a cutter knife or the like, and the protective film is separated into a remaining portion at the peripheral edge and a peeling portion surrounded by the remaining portion, or Make it separable. When a cut is formed in the protective film before the step (c) and the remaining portion and the peeled portion are separated, in the step (c), it becomes difficult to attach the protective film to the support surface material, or protection. From the point that it becomes difficult to align the notch of the protective film to a predetermined position when the first composition on the support surface material and the transparent surface material (protective plate) to which the film is attached is overlaid, After the step (e), it is preferable to form a cut in the protective film to separate the remaining portion and the peeled portion. At this time, the blade of the cutter knife may reach the adhesive layer under the protective film, but when the cutter knife reaches the light shielding part (light shielding printing part) beyond the adhesive layer, the light shielding part is formed from the transparent surface material side. Therefore, the cutter knife is preferably not in contact with the light-shielding part.
In addition, after the step (e), when the protective film protrudes from the peripheral edge of the transparent surface material, the extra protective film may be cut and removed by a cutter knife or the like as necessary.

〔Concrete example〕
Hereinafter, the manufacturing method of the transparent surface material 1 with the adhesion layer of FIG. 1 is demonstrated concretely using drawing.

(Process (a))
As shown in FIG. 5 and FIG. 6, a weir-like portion-forming photocurable resin composition is applied by a dispenser (not shown) or the like along the light-shielding printing portion 12 at the peripheral portion of the protective plate 10 (transparent surface material). Thus, an uncured weir 22 is formed.

(Process (b))
Next, as shown in FIG. 7 and FIG. 8, a layered portion-forming photocurable resin composition 26 is supplied to a rectangular region 24 surrounded by the uncured weir-shaped portion 22 of the protective plate 10. The supply amount of the photocurable resin composition for forming a layered portion 26 is such that the space sealed by the uncured weir-like portion 22, the protective plate 10 and the protective film 16 (see FIG. 9) is photocurable for forming the layered portion. The amount is set in advance so as to be filled with the resin composition 26.

As shown in FIGS. 7 and 8, the layered portion forming photocurable resin composition 26 is supplied by placing the protective plate 10 flat on the lower surface plate 28 and using a dispenser 30 that moves in the horizontal direction. It is carried out by supplying the curable resin composition 26 in the form of a line, a band or a dot.
The dispenser 30 is horizontally movable in the entire range of the region 24 by a known horizontal movement mechanism including a pair of feed screws 32 and a feed screw 34 orthogonal to the feed screw 32. Instead of the dispenser 30, a die coater may be used.

(Process (c))
Next, as shown in FIG. 9, the protective plate 10 and the support surface material 36 to which the protective film 16 is attached are carried into the decompression device 38. An upper surface plate 42 having a plurality of suction pads 40 is disposed in the upper portion of the decompression device 38, and a lower surface plate 44 is disposed in the lower portion. The upper surface plate 42 can be moved in the vertical direction by an air cylinder 46.
The support surface material 36 is attached to the suction pad 40 with the surface to which the protective film 16 is attached facing down. The protective plate 10 is fixed on the lower surface plate 44 with the surface to which the layered portion forming photocurable resin composition 26 is supplied facing up.

Then, the air in the decompression device 38 is sucked by the vacuum pump 48. After the atmospheric pressure in the pressure reducing device 38 reaches a reduced pressure atmosphere of, for example, 15 to 100 Pa, the protective plate 10 waiting underneath while the support surface material 36 is sucked and held by the suction pad 40 of the upper surface plate 42. Then, the air cylinder 46 is moved downward. And the protection board 10 and the support surface material 36 with which the protective film 16 was stuck are piled up through the uncured weir-like part 22. FIG. In this way, a laminate in which the uncured layered portion made of the layer-shaped portion-forming photocurable resin composition 26 is sealed with the protective plate 10, the protective film 16, and the uncured weir-shaped portion 22 is formed, and the reduced pressure atmosphere The laminate is held for a predetermined time under.

(Process (d))
Next, after the inside of the decompression device 38 is, for example, an atmospheric pressure atmosphere, the stacked body is taken out from the decompression device 38. When the laminate is placed in an atmospheric pressure atmosphere, the surface of the laminate on the side of the protective plate 10 and the surface on the side of the support surface 36 are pressed by the atmospheric pressure, and the uncured layered portion in the sealed space becomes the protective plate 10. Pressurized with the support surface material 36. By this pressure, the uncured layered portion in the sealed space flows, and the entire sealed space is uniformly filled with the uncured layered portion.

Next, light (ultraviolet light or visible light having a short wavelength) is irradiated from the support surface material 36 side to the weir-like portion 22 and the uncured layered portion, the uncured layered portion inside the laminate is cured, and the layered portion and An adhesive layer having a weir-like portion is formed.

(Process (e))
Subsequently, the transparent surface material 1 with the adhesion layer is obtained by peeling the support surface material 36 from the protective film 16.

(Process (f))
Next, in a state where the blade of the cutter knife (not shown) is pressed against the portion of the protective film 16 that overlaps the light shielding printing portion 12 when viewed from the normal direction of the protective film 16, the cutter knife is moved in the surface direction along the light shielding printing portion 12. By moving, the cut 16c is formed, and the protective film 16 is separated into the remaining portion 16b at the peripheral portion and the peeling portion 16a surrounded by the remaining portion 16b, or can be separated.

[Display device]
FIG. 10 is a cross-sectional view illustrating an example of the display device of the present invention.
The display device 2 includes a display panel 50 and a protective plate 10 (transparent surface material) having an area larger than that of the display panel 50 bonded to the surface on the viewing side of the display panel 50 via the adhesive layer 14. . The protective plate 10 (transparent surface material) is bonded to the display panel 50 so that the adhesive layer 14 is in contact with the display panel 50 after peeling only the peeling portion 16a of the protective film 16 from the transparent surface material 1 with the adhesive layer. It is a thing.

(Display panel)
As shown in FIG. 10, in the display panel 50 of this embodiment, a transparent substrate 52 provided with a color filter and a transparent substrate 54 provided with a TFT are bonded with a liquid crystal layer 56 interposed therebetween, and this is a pair of polarizing plates 58. It is pinched by. The transparent substrate 52 side on which the color filter is provided for the liquid crystal layer 56 is the viewing side. A polarizing plate 58 is provided on the viewing side of the transparent substrate 52 provided with the color filter, and a grounding transparent conductive layer 59 is provided between the polarizing plate 58 and the transparent substrate 52. The polarizing plate 58 is slightly smaller than the transparent conductive layer 59, and the transparent conductive layer 59 is exposed at the peripheral edge of the transparent substrate 52 on the color filter side. In addition, a flexible printed wiring board 60 (FPC) on which a driving IC for operating the display panel 50 is mounted is provided in connection with the display panel 50.
The shape of the display panel 50 is a rectangle. The dimensions of the protection plate 10 and the display panel 50 may be substantially equal, or the protection plate 10 may be made slightly larger than the display panel 50 in view of the relationship with other housings that house the display device.

In the display device 2, a polarizing plate 58 in which the layered portion 18 of the adhesive layer 14 exposed by peeling only the peeling portion 16 a of the protective film 16 from the transparent face material 1 with the adhesive layer is the outermost layer of the display panel 50. It is in close contact with. The size of the peeling portion 16 a is the same as the polarizing plate 58 or slightly larger than the polarizing plate 58.
There is a remaining portion 16b of the protective film 16 around the layered portion 18 that is in close contact with the polarizing plate 58, and the remaining portion 16b faces the transparent conductive layer 59 exposed outside the polarizing plate 58. is doing. In the example of this embodiment, the protective film 16 is thinner than the thickness of the polarizing plate 58, and the remaining portion 16 b of the protective film 16 is not in contact with the transparent conductive layer 59 exposed outside the polarizing plate 58. Therefore, a conductive member 61 that electrically connects them is provided. The conductive member 61 may be provided at two or more locations.
As the material of the conductive member 61, for example, an easily deformable material such as conductive rubber or conductive sponge is preferably used. When the pressure-sensitive adhesive layer 14 can be easily deformed, a plate-like or particulate conductive member may be used, or a conductive adhesive may be used partially or entirely.
In addition, in the state which bonded the transparent surface material 1 with the adhesion layer which peeled the peeling part of the protective film, and the display panel 50, when the remaining part 16b of the protective film 16 and the transparent conductive layer 59 contact, it is a conductive member. 61 may not be provided.

Specifically, the display device 2 is
A display panel 50;
The area is larger than that of the display panel 50, and a frame-shaped light-shielding printing portion 12 is formed at the periphery, is surrounded by the light-shielding printing portion (light-shielding portion) 12, and has almost the same size as the image display area of the display panel 50. A protective plate 10 having a light transmitting portion 13 and laminated so as to cover the outer peripheral portion of the display panel;
An adhesive layer 14 sandwiched between the protective plate 10 and the display panel 50;
A remaining portion 16b of the protective film 16 that covers the surface of the adhesive layer 14 at the peripheral edge of the protective plate 10 that is not bonded to the display panel via the adhesive layer 14;
A flexible printed wiring board 60 (FPC) mounted with a driving IC for operating the display panel 50 connected to the display panel 50;
A conductive member 61 for electrically connecting the transparent conductive layer 59 for grounding provided on the display panel and the remaining portion 16b of the protective film 16;
Have

The display panel in the present invention is not limited to the illustrated liquid crystal panel.
The liquid crystal panel is a liquid crystal panel in which a liquid crystal layer is provided between a pair of transparent substrates, and of the pair of transparent substrates, the ground transparent on the surface on the viewing side of the transparent substrate closer to the viewing side than the liquid crystal layer There is no particular limitation as long as the conductive layer is provided. In general, optical films such as a polarizing plate and a retardation plate are laminated on the viewing side of the grounding transparent conductive layer, and these optical films are the outermost layers.
Moreover, as a display panel other than the liquid crystal panel, any display panel may be used as long as it has a configuration in which a transparent conductive layer for grounding is provided on the viewing side, and examples thereof include a display panel for electronic paper.

A surface treatment may be performed on the bonding surface of the display panel 50 with the layered portion 18 in order to improve the interfacial adhesive force with the weir-shaped portion 20. The surface treatment may be performed only on the peripheral edge or on the entire surface of the face material. Examples of the surface treatment method include a treatment method using an adhesion primer or the like which can be processed at a low temperature.
The thickness of the display panel 50 is about 0.4 to 4 mm in the case of a liquid crystal panel operated by TFT, and is often about 0.2 to 3 mm in the case of an EL panel.

[Manufacturing method of display device]
In order to manufacture a display device, after peeling off the peeling portion of the protective film (protective material) from the transparent surface material with the adhesive layer of the present embodiment, the adhesive layer is the display panel. Laminate and touch to touch.
The manufacturing method of the display device may be a method including steps S1 and S2 described below.

(Step S1: Protective film peeling step)
In this process, the peeling part of a protective film is peeled from the transparent surface material with the adhesion layer by which the adhesion layer was covered with the protective film. Hereinafter, the transparent surface material with the pressure-sensitive adhesive layer from which the peeling portion of the protective film has been peeled is referred to as a transparent surface material with the peeled pressure-sensitive adhesive layer. The peeling of the peeling portion of the protective film may be performed in the air or may be performed in a reduced pressure atmosphere. After peeling the peeled portion, until the transparent surface material with the peeled adhesive layer is transferred to the inside of the vacuum container used in Step S2, the transparent surface material with the peeled adhesive layer is not exposed to the atmosphere, and is in a reduced pressure atmosphere. If it can be stored, it is preferable to carry out peeling of the peeling portion in a reduced pressure atmosphere. However, it is often difficult to actually remove the protective film in a reduced pressure atmosphere due to production facilities and the like. In that case, there is no particular problem even if the peeling portion is peeled off in the air. In the point that it is not necessary to prepare a decompression container in the protective film peeling step, it is preferable to carry out peeling of the protective film peeling portion in the atmosphere. It is preferable to perform step S2 promptly after peeling of the peeling portion.

(Process S2: Pasting process)
In this process, as shown in FIG. 11, in a bonding apparatus, the display panel and the peeled adhesive layer-attached transparent surface material are bonded together so that the pressure-sensitive adhesive layer is in contact with the display panel. At this time, in the decompression container of the pasting apparatus, it is preferable to paste the display panel and the peeled transparent surface material with the adhesive layer in a reduced pressure atmosphere. By pasting in a reduced pressure atmosphere, voids are less likely to occur at the interface between the display panel and the adhesive layer. Inside the decompression vessel, after maintaining the decompressed atmosphere for a predetermined time, the decompressed atmosphere is released to normal pressure. The reduced-pressure atmosphere at the time of pasting is 1 kPa or less. Further, the reduced pressure atmosphere is preferably 10 to 500 Pa, more preferably 15 to 200 Pa.

The time from when the display panel and the peeled adhesive layer-attached transparent surface material are overlapped to the release of the reduced-pressure atmosphere is preferably a short time from the viewpoint of production efficiency. For example, it is preferably within 1 minute, and more preferably within 10 seconds.
After the display panel and the peeled adhesive layer-attached transparent face material are bonded, the adhesive layer that is not fully cured is irradiated with light again or heated to accelerate the curing of the adhesive layer. The cured state may be stabilized.

When the transparent face material with the adhesive layer has flexibility, the transparent face material with the peeled adhesive layer is curved so that the surface side where the adhesive layer of the transparent face material with the peeled adhesive layer is formed becomes convex Then, the transparent surface material with a peeled adhesive layer may be bonded by a method of gradually overlapping the display panel from one end side to the other end side. According to this method, since the gas existing in the space between the peeled adhesive layer-attached transparent surface material and the display panel is pushed out from one end side to the other end side, the display panel, the adhesive layer, It becomes difficult to generate voids at the interface.

(Function and effect)
In the display device of the present embodiment, the peeled portion 16a of the protective film 16 is peeled off from the transparent surface material 1 with the pressure-sensitive adhesive layer so that the pressure-sensitive adhesive layer 14 is in contact with the display panel 50. Yes. If the transparent surface material 10 is slightly larger than the display panel 50, the peripheral portion of the transparent surface material 10 is not bonded to the display panel 50 via the adhesive layer 14. In the peripheral part of the display panel 50 and the transparent face material 10, the remaining part 16 b of the protective film 16 exists on the surface of the adhesive layer 14. Since the surface resistance value of the protective film 16 on the surface opposite to the adhesive layer side is 1 × 10 ² to 1 × 10 ⁸ Ω / □, the protective film 16 is provided on the remaining portion 16b of the protective film 16 and the display panel 50. A configuration for grounding the transparent conductive layer 59 can be easily realized by electrically connecting the grounding transparent conductive layer 59 and grounding the remaining portion 16b.

The transparent surface material with an adhesive layer has a light-shielding portion formed on the peripheral edge of at least one surface and a light-transmitting portion surrounded by the light-shielding portion, and the protective film is normal to the transparent surface material The remaining part of the protective film is separated into the remaining part of the peripheral part and the peeling part surrounded by the remaining part by the notch formed in the protective film in the part overlapping the light shielding part when viewed from the direction. And the boundary part between the remaining part and the display panel is concealed and cannot be seen from the viewing side.

Moreover, the interface of a display panel and an adhesion layer is laminated | stacked so that an adhesion layer may contact | connect a display panel in a pressure-reduced atmosphere of 1 kPa or less so that an adhesion layer may contact | connect a display panel. Even if voids remain, when the pressure is returned to atmospheric pressure, the pressure difference between the pressure in the voids (pressure in a state of reduced pressure) and the pressure applied to the adhesive layer (that is, atmospheric pressure) As a result, the volume of the voids is reduced, and the micronized voids are absorbed by the adhesive layer and disappear. Moreover, since the transparent surface material with an adhesive layer of the present invention is used, the generation of voids at the interface between the transparent surface material and the adhesive layer is sufficiently suppressed.

The technical scope of the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.
The protective film having a conductive layer is composed of a laminate having one or more layers of a support material and a slightly adhesive layer, and the slightly adhesive layer forms the outermost layer opposite to the adhesive layer side of the protective film, What is necessary is just the structure by which the conductive layer is provided between the support material nearest to a slightly adhesion layer, and a slight adhesion layer.
Moreover, in the said embodiment, although the surface resistance was provided to the protective film by providing the conductive layer 9 in the protective film 16, instead of providing the conductive layer 9, for example, the support material closest to the slightly adhesive layer 8 is made conductive. A polymer may be used, or the support material may contain conductive particles or the like.

In the said embodiment, although the peripheral part of the protective film 16 was made into the residual part 16b, in the state which bonded the transparent surface material 10 to the display panel 50, it is in the position close | similar to the transparent conductive layer 59 provided in the display panel 50. It is sufficient that a part of the protective film 16 remains, and the position and shape of the remaining portion 16b are not limited. In order to make it difficult to see from the viewing side, it is preferable to provide the remaining part of the protective film 16 at the peripheral part. Further, when the transparent surface material 10 and the adhesive layer 14 are slightly larger than the display panel 50, if the entire peripheral portion of the protective film 16 is the remaining portion 16b, the peripheral portion of the adhesive layer 14 not bonded to the display panel 50 is used. It is preferable in that it can be protected by the protective film 16 and that the pieces are easily prevented from falling off when the peripheral edge of the transparent face material is cracked.
Moreover, the transparent surface material with an adhesion layer does not need to be provided with a cut in the protective film in advance. In that case, what is necessary is just to form a notch | lamination before bonding the transparent surface material with an adhesion layer to a display panel.
In the said embodiment, although the magnitude | size of the transparent surface material 10 is larger than the display panel 50, in the state which bonded both, the transparent conductive layer 59 provided in the display panel 50 and the remaining part of the protective film 16 are electric. In other words, the transparent surface material 10 and the display panel 50 may have the same size.

In the said embodiment, although the transparent surface material with the adhesion layer was bonded to the display panel as a protective plate of a display apparatus, coordinate input devices, such as a touch panel, are previously formed in the bonding surface with the display panel of a transparent surface material. Or another transparent surface material such as a touch panel may be pasted in advance. When forming a pressure-sensitive adhesive layer to be bonded to the display panel on a transparent surface material to which a coordinate input device such as a touch panel has been applied in advance, the surface of the transparent surface material facing the display surface of the display panel Then, an adhesive layer covered with a protective film 16 provided with the conductive layer 9 is formed.
In the manufacturing method of the above embodiment, the gas content of the adhesive layer is reduced by placing the adhesive layer in a reduced-pressure atmosphere in the production process of the transparent surface material with the adhesive layer, but the adhesive layer is reduced by being placed under reduced pressure. The step of reducing the gas content may be at any time as long as it is before the step of bonding the transparent surface material with the adhesive layer to the object to be bonded.

According to the present invention, a part of the protective film of the transparent surface material with the adhesive layer is left, the other part is peeled off, and the remaining protective film and the display panel are bonded to the display panel of the display device. By electrically connecting the transparent conductive layer for grounding provided on the transparent conductive layer, it is possible to easily realize a configuration for grounding the transparent conductive layer. It is suitable for a display device including a display panel in which a transparent conductive layer for grounding is provided on the viewing side from the liquid crystal layer, such as an (IPS type) liquid crystal display device.
The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2012-227976 filed on October 15, 2012 are incorporated herein as the disclosure of the present invention. .

1 Transparent surface material with adhesive layer,
2 display devices,
10 Protection plate (transparent surface material),
3 first support material,
4 barrier layers,
8 Slightly adhesive layer,
9 conductive layer,
12 Shading part (shading printing part),
13 Translucent part,
14 Adhesive layer,
16 Protective film,
16a peeling part,
16b remaining part,
16c notch,
18 Layered part,
20 Weir-shaped part,
50 display panel,
58 Polarizing plate,
59 transparent conductive layer,
61 conductive members,

Claims

Transparent face material,
An adhesive layer formed on one surface of the transparent face material;
A peelable protective film that covers the surface of the adhesive layer opposite to the transparent face material side,
The transparent film with an adhesive layer, wherein the protective film has a surface resistance value of 1 × 10 2 to 1 × 10 8 Ω / □ on at least a part of the surface opposite to the adhesive layer side.
The transparent face material has a light shielding part formed at a peripheral edge part of at least one surface, and a light transmitting part surrounded by the light shielding part,
The protective film has a frame-like residual portion and a peeling portion surrounded by the residual portion by a cut formed in the protective film at a portion overlapping the light shielding portion when viewed from the normal direction of the transparent surface material. The transparent surface material with an adhesive layer according to claim 1, which is separable or separable.
3. The transparent surface material with an adhesive layer according to claim 2, wherein the remaining portion has a surface resistance value of 1 × 10 2 to 1 × 10 8 Ω / □ on the surface opposite to the adhesive layer side.
The pressure-sensitive adhesive layer according to any one of claims 1 to 3, wherein the protective film has a surface resistance value of 1 × 10 2 to 1 × 10 8 Ω / □ on the entire surface opposite to the pressure-sensitive adhesive layer side. With transparent face material.
The protective film comprises a laminate having one or more layers of a support material and a slightly adhesive layer,
The slightly adhesive layer is located on the outermost layer opposite to the adhesive layer side of the protective film,
The transparent surface material with an adhesive layer according to any one of claims 1 to 4, wherein a conductive layer is provided between the support material closest to the slightly adhesive layer and the slightly adhesive layer.
The transparent surface material with an adhesive layer according to any one of claims 1 to 5, wherein the transparent surface material is a protective plate of a display device.
A display panel in which a liquid crystal layer is provided between a pair of transparent substrates;
A transparent surface material bonded via a pressure-sensitive adhesive layer on the viewing side surface of the display panel;
A display device comprising:
The outer periphery of the transparent face material is coincident with the outer periphery of the display panel or located outside the outer periphery of the display panel,
The display panel has a transparent conductive layer on the surface on the viewing side,
The transparent surface material comprises the transparent surface material with an adhesive layer according to any one of claims 2 to 4,
The display device, wherein the remaining portion of the protective film is left and the adhesive layer is bonded to the display panel in a state where the peeling portion is peeled off.
The transparent conductive layer on the viewing side surface of the display panel and the remaining portion having a surface resistance value of 1 × 10 2 to 1 × 10 8 Ω / □ of the protective film are electrically connected. The display device according to claim 7.
The display device according to claim 7 or 8, wherein the display device is a horizontal electric field type liquid crystal display panel.