WO2017212989A1

WO2017212989A1 - Layered film, method for manufacturing layered film provided with mark, and method for manufacturing image display device

Info

Publication number: WO2017212989A1
Application number: PCT/JP2017/020187
Authority: WO
Inventors: 幹士藤井
Original assignee: 住友化学株式会社
Priority date: 2016-06-06
Filing date: 2017-05-31
Publication date: 2017-12-14

Abstract

Provided are a layered film whereby the precision of positional alignment between an image display panel and a polarizing plate can be further enhanced, and a method for manufacturing an image display device. A layered film 100 is provided with a polarizing plate 10 and a temporary protective film 8 provided on one side of the polarizing plate 10. The layered film 100 is provided with a peripheral region 100P extending a fixed width from the end surface of the layered film, and a central region 100C toward the inside from the peripheral region 100P. The fixed width is determined so as to satisfy the expression SC/(SP + SC) ≤ 0.7, where SP is the surface area of the peripheral region 100P and SC is the surface area of the central region 100C. The central region 100C has a mark M.

Description

LAMINATED FILM, MARKING LAMINATED FILM MANUFACTURING METHOD, AND IMAGE DISPLAY DEVICE

The present invention relates to a laminated film, a method for producing a marked laminated film, and a method for producing an image display device.

Conventionally, a polarizing film and a laminated film in which a temporary protective film is provided on one surface of the polarizing plate are known. When the laminated film is bonded to an image display panel such as a liquid crystal panel, it is necessary to accurately align the optical axis (transmission axis or absorption axis) of the polarizing plate of the laminated film with respect to the image display panel. .

In order to contribute to this alignment, it is known to mark the end of the polarizing plate or mark the end of the protective film.

WO2007 / 108244 publication JP 2005-266284 A

However, in the conventional method, the alignment accuracy between the image display panel and the polarizing plate is not sufficient.

The present invention has been made in view of the above problems, and can further improve the alignment accuracy between the image display panel and the polarizing plate, a laminated film, a method for producing a marked laminated film, and an image display device. It aims at providing the manufacturing method of.

The laminated film according to the present invention includes a polarizing plate and a temporary protective film provided on one surface of the polarizing plate. The laminated film includes a peripheral region having a constant width from an end surface of the laminated film, and a central region inside the peripheral region. When the area of the peripheral region is SP and the area of the central region is SC, the constant width is determined so as to satisfy SC / (SP + SC) ≦ 0.7. The central region has a mark.

According to the present invention, since the mark is provided in the central region, even if the peripheral region of the polarizing plate is curled when the polarizing plate is attached to the image display panel, the mark is not affected by the curl. The polarizing plate and the image display panel can be aligned with high accuracy.

Here, the mark may be a through-hole penetrating the laminated film.

The mark is provided on the surface of the temporary protective film, a dent provided on the surface of the temporary protective film, a through hole provided in the temporary protective film, a dyed portion provided on the temporary protective film, and a surface of the temporary protective film. And at least one selected from the group consisting of colored layers.

Also, the shape of the mark may be at least one selected from the group consisting of a line, a cross, an arrow, an ellipse, and a polygon.

Also, the outer shape of the laminated film can be a circle or a regular polygon.

The manufacturing method of the laminated film with a mark concerning this invention has the process of providing a mark in a laminated film provided with the polarizing plate and the temporary protective film provided in the one surface of the said polarizing plate.
The laminated film includes a peripheral region having a constant width from an end surface of the laminated film, and a central region inside the peripheral region. When the area of the peripheral region is SP and the area of the central region is SC, the constant width is determined so as to satisfy SC / (SP + SC) ≦ 0.7. In the step of providing the mark, the mark is Provided in the central area.

The method of manufacturing an image display device according to the present invention includes the step of aligning the optical axis of the laminated film with respect to the image display panel with reference to the mark,
Bonding the aligned laminated film to the image display panel.

According to the present invention, there are provided a laminated film and a method for manufacturing an image display device, which can further improve the accuracy of alignment between the image display panel and the polarizing plate.

1A is a cross-sectional view of a laminated film according to an embodiment, and FIG. 1B is a top view of FIG. 2A and 2B are cross-sectional views of a laminated film according to another embodiment. 3A to 3E are top views showing other examples of the mark shape of the laminated film. FIGS. 4A to 4E are top views of laminated films according to other embodiments, respectively. FIG. 5A is a top view of the image display device, and FIG. 5B is a schematic cross-sectional view of the image display device. FIG. 6 is a schematic top view of a laminated film according to a comparative example and an example.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted. The dimensional ratios in the drawings do not necessarily match the actual ones, and in particular, the thickness is exaggerated.

As shown in FIG. 1A, a laminated film 100 according to this embodiment includes a polarizing plate 10, a temporary protective film 8 bonded to one surface of the polarizing plate 10 with an adhesive layer 7, and a polarizing plate. It has a separate film 9 bonded to the other surface of the plate 10 with an adhesive layer 7.

(Polarizer)
The polarizing plate 10 includes a polarizer 2 and a protective film 3 bonded to both surfaces of the polarizer 2 with an adhesive layer 5.

(Polarizer)
As the material of the polarizer 2, a known material that has been conventionally used in the production of polarizing plates can be used. For example, polyvinyl alcohol resin, polyvinyl acetate resin, ethylene / vinyl acetate (EVA) resin, polyamide Examples thereof include resins and polyester resins. Of these, polyvinyl alcohol resins are preferred. Usually, as a starting material for manufacturing the polarizer 2, for example, an unstretched film of a polyvinyl alcohol-based resin film having a thickness of 5 to 100 μm, preferably 10 to 80 μm, is used. The polarizer 2 is obtained by subjecting this unstretched film to a dyeing process, a boric acid process, a stretching process, and the like.

The thickness of the polarizer 2 is preferably 3 to 20 μm, more preferably 5 to 18 μm, still more preferably 7 to 16 μm.

(Protective film)
The protective film 3 is a film that prevents the main surface and end of the polarizer 2 from cracking and scratching.

The protective film 3 is preferably composed of various transparent resin films known in the field of polarizing plates. For example, cellulose resin whose typical example is triacetyl cellulose, polyolefin resin whose typical example is polypropylene resin, cyclic olefin resin whose typical example is norbornene resin, acrylic whose typical example is polymethyl methacrylate resin Examples thereof include polyester resins and polyester resins having polyethylene terephthalate resins as representative examples. Among these, cellulose resin is representative.

Here, that the protective film is “transparent” means that the total light transmittance measured in accordance with JIS K 7361 is 70% or more.

The

protective films

3 and 3 may be made of the same kind of material as each other, or may be made of another kind of material.

The protective film 3 may be a film having no optical function, or may be a film having an optical function such as a retardation film or a brightness enhancement film.

The thickness of the protective film 3 is preferably 5 to 30 μm, more preferably 7 to 27 μm, and still more preferably 9 to 25 μm.

(Adhesive layer)
As the adhesive of the adhesive layer 5, various adhesives conventionally used for manufacturing a polarizing plate can be used. For example, an epoxy resin that does not contain an aromatic ring in the molecule is preferable from the viewpoint of weather resistance, refractive index, cationic polymerizability, and the like. Moreover, what hardens | cures by irradiation of an active energy ray (an ultraviolet ray or a heat ray) is preferable.

As the epoxy resin, for example, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin and the like are preferable. For epoxy resins, polymerization initiators (for example, photocationic polymerization initiators for polymerization by ultraviolet irradiation, thermal cationic polymerization initiators for polymerization by heat ray irradiation), and other additives (sensitizers, etc.) Can be added to prepare an epoxy resin composition for coating.

Also, as the adhesive, acrylic resins such as acrylamide, acrylate, urethane acrylate, and epoxy acrylate, and polyvinyl alcohol-based aqueous adhesives can be used.

The thickness of the polarizing plate 10 is preferably 20 to 100 μm, more preferably 25 to 90 μm, and still more preferably 30 to 80 μm.

The polarizing plate 10 can further include another optical layer laminated on the protective film 3. As another optical layer, a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light having the opposite properties; a film with an antiglare function having an uneven surface; a film with a surface antireflection function; surface A reflective film having a reflective function; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.

(Temporary protective film)
The temporary protective film 8 is a film that can be peeled off from the polarizing plate 10 together with the pressure-sensitive adhesive layer 7. When the laminated film 100 is handled at the time of application to an image display element, the temporary protective film 8 It is a film for protecting the surface from damage, abrasion and the like.
After the temporary protective film 8 is laminated on the protective film 3, it can remain bonded to the protective film 3 until the polarizing plate 10 is used. When the temporary protective film 8 is peeled from the protective film 3 before the polarizing plate 10 is used, the pressure-sensitive adhesive layer 7 is peeled from the polarizing plate 10 side together with the temporary protective film 8 in a state of being attached to the temporary protective film 8 side. The

The material of the temporary protective film 8 is preferably a polyester resin such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, or polybutylene terephthalate, and the same material as the protective film 3 may be used. Any other plastic film having the required strength and optical suitability, for example, polyolefin film, polyacetate film, polycarbonate film, polyphenylene sulfide film, polyamide film, polyvinyl chloride film, ethylene-acetic acid A vinyl copolymer film, various liquid crystal polymer films, etc. can be used.

The thickness of the temporary protective film 8 is preferably 5 to 70 μm, more preferably 10 to 60 μm, and still more preferably 15 to 50 μm.

(Adhesive layer)
The pressure-sensitive adhesive layer 7 can be composed of acrylic resin, silicone resin, polyester, polyurethane, polyether, or the like.

The thickness of the pressure-sensitive adhesive layer 7 is preferably 2 to 40 μm, and more preferably 4 to 25 μm.

Examples of the method of providing the pressure-sensitive adhesive layer 7 include various pressure-sensitive adhesives such as an acrylic one-component or two-component adhesive, a rubber-based adhesive, and a silicone-based adhesive on the temporary protective film 8. There is a method in which the pressure-sensitive adhesive layer 7 is formed and then laminated on the protective film 3. Usually, a temporary protective film is provided with a pressure-sensitive adhesive layer, and a temporary protective film laminate in which a pressure-sensitive adhesive layer is further provided with a release film is once wound up into a roll, and immediately before bonding with the protective film 3. The release film is peeled off from the temporary protective film laminate and bonded to the protective film 3.
Alternatively, the adhesive film 7 may be provided by applying a solution containing the above-described resin or any additive component to the protective film 3 of the polarizing plate 10, and then the temporary protective film 8 may be bonded.

(Separate film)
The separate film 9 is a peelable film that is stuck for the purpose of protecting the pressure-sensitive adhesive layer 7 or preventing adhesion of foreign matters, and is peeled off when the laminated film 100 is used to expose the pressure-sensitive adhesive layer 7. The separate film 9 can be made of, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Among these, a stretched film of polyethylene terephthalate is preferable.

The pressure-sensitive adhesive layer 7 on which the separate film 9 is laminated is a layer that functions when the polarizing plate 10 is attached to another article (for example, a liquid crystal cell or a touch panel). As the material for the pressure-sensitive adhesive layer 7, the same material as that used when the temporary protective film 8 is laminated can be used.

The separation film 9 may be subjected to a release treatment with a silicone resin or the like on the surface in contact with the pressure-sensitive adhesive layer 7 so that it can be easily peeled off when the laminated film 100 is used. When the separate film 9 is peeled off, the pressure-sensitive adhesive layer 7 remains on the polarizing plate 10 side.

The thickness of the separate film 9 is preferably 5 to 70 μm, more preferably 10 to 60 μm, and still more preferably 15 to 50 μm.

As shown in FIG. 1A, the outer shape of the laminated film 100 is circular when viewed from the lamination direction. Such a shape can be easily obtained by cutting out a wide film with a laser or a blade.

(mark)
When viewed from the thickness direction of the laminated film 100, the laminated film 100 includes a peripheral region 100P having a constant width from the end surface of the laminated film 100, and a central region 100C inside the peripheral region 100P. Here, when the area of the peripheral region 100P is SP and the area of the central region 100C is SC, the constant width is determined so as to satisfy SC / (SP + SC) ≦ 0.7. Here, SC / (SP + SC) ≦ 0.6 is preferable, SC / (SP + SC) ≦ 0.5 is more preferable, SC / (SP + SC) ≦ 0.4 is further preferable, and SC / (SP + SC) ≦ 0.3. Is particularly preferred.

In this embodiment, the center region 100C has a mark M. Specifically, the mark M is a colored layer 20 provided on the surface of the temporary protective film 8. The colored layer 20 can be formed by a printing apparatus such as an ink jet printer. The colored layer can contain colored components such as resins and pigments and dyes.

The mark M is not limited to the colored layer 20. Other aspects of the mark M are shown in FIGS. In FIG. 2A, the mark M is a recess 21 provided in the temporary protective film 8. Such a recess 21 can be easily formed by a laser, a blade or the like. In FIG. 2A, the depth of the recess 21 is a depth at which the pressure-sensitive adhesive layer 7 is not exposed. However, the pressure-sensitive adhesive layer 7 may be exposed, that is, a through-hole, as indicated by a dotted line in FIG. Furthermore, a through-hole penetrating the temporary protective film 8 and the pressure-sensitive adhesive layer 7 may be used so that the protective film 3 is exposed through the temporary protective film 8 and the pressure-sensitive adhesive layer 7. In FIG. 2B, the mark M is a through hole 22 that penetrates the entire laminated film 100. In addition to this, the mark M may be, for example, a dyed portion provided on the temporary protective film 8.

The shape of the mark M is a cross in which the length of one line is longer than the length of the other line in FIG. The shape of the mark M is not limited to a cross. For example, the line shape shown in FIG. 3A may be used, the arrow shape may be used as shown in FIG. 3B, the ellipse may be used as shown in FIG. As shown in (d) of FIG. 3, it may be a triangle (excluding a regular triangle) or a rhombus (excluding a square) as shown in (e) of FIG. Other polygons (excluding regular polygons) may be used. Each polygon is preferably not a regular polygon, but if it is a regular polygon, a plurality of polygons may be provided.

The length of the long axis (longest axis) of the mark M can be set to 0.1 to 10 mm, for example. The length of the short axis (the axis in the shortest direction) of the mark M can be set to 0.1 to 7 mm, for example.

The mark M represents the direction of the light absorption axis or light transmission axis (optical axis) of the polarizer 2 of the polarizing plate 10. For example, the direction of the major axis of the mark M is parallel to the light absorption axis or light transmission axis (for example, the vertical direction in FIGS. 1B and 4A to 4E), etc. The position of the optical axis of the polarizer is based on the direction of the mark M (the direction of the long axis, etc.) by providing the mark M so that the direction of the major axis is at a constant angle with the optical axis of the polarizer. Can be easily determined. Further, the position of the mark M is detected by providing the mark M at a fixed position with respect to the laminated film, for example, by providing the mark M so that the center of gravity of the mark M overlaps the center of gravity of the laminated film 100. By doing so, the position in the in-plane direction of the laminated film (polarizing plate 10) can be detected.

Still another example of the mark M of the laminated film 100 will be described. The laminated film 100 shown in FIG. 4A is provided with a through hole h having a circular cross section at the center, and the mark M is provided at two edges on both sides of the through hole h. In this form, only both ends of the line (a) are arranged.

Next, another example of the outer shape of the laminated film 100 will be described. The outer shape of the laminated film 100 is a regular polygon such as a square (see (b) in FIG. 4), a regular hexagon (see (c) in FIG. 4), and a regular octagon (see (d) in FIG. 4). However, it may be a barrel shape (see FIG. 4E). For example, if it is a regular polygon or a circle, the direction of the optical axis cannot be determined from the outer shape, so the effect of the present invention is particularly high.

In any aspect, the mark M is provided in the central region 100C. It is sufficient that at least a part of the mark M is provided in the central region 100C, but it is preferable that all of the marks M exist in the central region 100C.

Here, the laminated film after peeling the separate film 9 from the laminated film 100 is referred to as a laminated film 90.

<Method for Manufacturing Image Display Device>
Then, with reference to (a) and (b) of FIG. 5, the manufacturing method of the image display apparatus using the above-mentioned laminated film 100 is demonstrated.

First, the image display panel 50 is prepared. An example of an image display panel that requires the attachment of a polarizing plate is a liquid crystal panel, but may be an organic EL panel or the like.

Next, the remaining laminated film 90 obtained by peeling the separate film 9 from the laminated film 100 is pasted on the surface of the image display panel 50. At this time, it is necessary to attach the laminated film 90 at a predetermined position on the surface of the image display panel 50 with the optical axis of the polarizing plate 10 in a predetermined direction.

In the present embodiment, a pair of marks LCM1 indicating a preferable direction of the optical axis is provided on the surface of the image display panel 50, and a pair of marks LCM2 indicating a preferable direction of the optical axis is provided on the back surface of the image display panel 50. Is provided.

In this embodiment, first, the separate film 9 is peeled from the laminated film 100 to form a laminated film 90. Next, based on the shape of the mark M, the rotation direction of the laminated film 90 is adjusted to a predetermined direction. Specifically, for example, the laminated film 90 may be rotated so that the major axis direction of the mark M and the direction connecting the pair of marks LCM1 of the image display panel are parallel to each other. Further, based on the position of the mark M, the position in the in-plane direction of the laminated film 90 is adjusted to a predetermined position with respect to the image display panel 50. Specifically, for example, the laminated film 90 may be moved so that the position of the mark M is between the pair of marks LCM1. Thus, after aligning the rotation position and in-plane position of the laminated film 90 with respect to the image display panel 50, the laminated film 90 is placed on the surface of the image display panel 50 via the adhesive layer 7. Paste.

The pasting process including the positioning process includes a camera for photographing the mark, an image processing device for recognizing the shape and position of the mark based on the photographed image, and a necessary rotation amount and necessary movement amount based on the processing result. It can be realized by a positioning device including a movement control device that calculates the value and a robot hand that moves the laminated film 90. Image processing and movement control can be computer processing.

Subsequently, the separate film 9 is peeled from another laminated film 100 to form another laminated film 90, and based on the mark M of the laminated film 90 and the pair of marks LCM2 on the back side of the image display panel 50. Similarly, the laminated film 90 is attached to the back surface of the image display panel 50.

Thereby, the optical axes and positions of the pair of

laminated films

90 and 90 attached to the image display panel 50 are adjusted to a desired position. For example, it can arrange | position so that the optical axis of the polarizer of a pair of laminated film may mutually orthogonally cross.

<Action>
In the laminated film 100 (90) including the polarizer, the peripheral region is easily curled. Therefore, if the mark M is provided in the peripheral area of the laminated film 100 (90), the position of the mark M is displaced due to the curl, and the alignment accuracy with the image display panel may be lowered.

However, according to the present embodiment, the mark M is provided in the central region 100C of the laminated film 100 (90). Therefore, when referring to the mark M with a camera, visual observation, or the like, it is possible to reduce a deviation in recognition of the position of the mark M. Therefore, the rotational position of the laminated film 90 and the position in the in-plane direction can be adjusted with respect to the image display panel 50 with high accuracy.

As an example of the layer structure of the laminated film 100 in which the peripheral region is easily curled, when the thickness of the laminated film is thin (particularly 200 μm or less) and the rigidity is low, the

protective films

3 and 3 are made of different materials (for example, one is triacetyl). When the cellulose-based resin such as cellulose and the other is a cyclic olefin-based resin), when any one of the protective films 3 is not provided, and the moisture permeability of any layer constituting the laminated film 100 is high (for example, 250 g / m ² · 24 h or more). Also, the peripheral region is easily curled when the outer shape of the laminated film 100 has acute corners. Since the laminated film 100 having such a layer configuration and / or outer shape is easily curled in the peripheral region, the effect of the present invention is particularly high.

The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the said embodiment, although the adhesive layer 7 and the separate film 9 are provided in the opposite side to the temporary protective film 8 of the polarizing plate 10, it can implement even without these. For example, an adhesive may be provided on the image display panel side when being attached to the image display panel, and the protective film of the laminated film 100 may be directly attached to the adhesive.

It is also possible not to have the adhesive layer 7 between the temporary protective film 8 and the protective film 3.

(Comparative Examples 1 to 3, Examples 1 and 2)
As shown in FIG. 6, a rectangular laminated film 100 of 120 mm × 70 mm was prepared. The laminated film 100 had a total thickness of 270 μm and the following configuration.

Temporary protective film 8 (polyethylene terephthalate) / adhesive layer 7 (acrylic resin) / protective film 3 (triacetyl cellulose) / adhesive layer 5 (epoxy resin) / polarizer 2 (iodine dyed stretched PVA) / adhesive layer 5 (epoxy resin) / protective film 3 (triacetyl cellulose) / adhesive layer 7 (acrylic resin) / separate film 9 (polyethylene terephthalate)

When this laminated film 100 was placed on a flat surface, the end portion was lifted from the flat surface by curling, and the most lifted portion was about 6 mm from the flat surface (about 5% with respect to the long side).

The laminated film 100 is provided with a cross mark M (vertical bar length 0.5 mm, horizontal bar length 0.5 mm, vertical bar and horizontal bar width 0.05 mm) on the surface of the temporary protective film 8. The mark M is a resin layer formed with black ink.

The mark M was arranged so that the vertical bar of the cross mark M was parallel to the short side of the laminated film 100 and the horizontal bar was parallel to the long side of the laminated film 100.

In Comparative Example 1, the central region 100C and the peripheral region 100P are set so that SC / (SP + SC) = 0.95, and the position of the mark M is such that a part of the cross mark M exists in the central region 100C. Determined. Specifically, the boundary line B between the central region 100C and the peripheral region 100P is arranged so as to pass through the center of the vertical bar and horizontal bar of the cross mark M, respectively. The width a of the peripheral region 100P was 1 mm.

Comparative Examples 2 and 3 and Examples 1 and 2 were the same as Comparative Example 1 except that SC / (SP + SC) was 0.86, 0.78, 0.70, and 0.63, respectively. The width a of the peripheral region 100P was 3 mm, 5 mm, 7 mm, and 9 mm, respectively.

The laminated films of the comparative examples and examples placed on the flat plate were photographed with a camera from above, and it was confirmed whether or not the shape of the cross mark M could be correctly recognized. The results are shown in Table 1.

A case where the cross mark M can be recognized without distortion is indicated by ◯, a case where the cross mark M is recognized slightly distorted, and a case where the cross mark M is recognized largely distorted by x.
It was confirmed that the mark can be recognized with high accuracy when there is a mark in the central region 100C where SC / (SP + SC) is 0.7 or less.

DESCRIPTION OF SYMBOLS 10 ... Polarizing plate, 20 ... Colored layer, 21 ... Depression, 22 ... Through-hole, 90, 100 ... Laminated film, 8 ... Temporary protective film, 100P ... Peripheral area | region, 100C ... Center area | region, M ... Mark.

Claims

A laminated film comprising a polarizing plate and a temporary protective film provided on one surface of the polarizing plate,
The laminated film comprises a peripheral region having a constant width from an end surface of the laminated film, and a central region inside the peripheral region,
When the area of the peripheral region is SP and the area of the central region is SC, the constant width is determined so as to satisfy SC / (SP + SC) ≦ 0.7,
The said center area | region has a mark, Laminated film.
The laminated film according to claim 1, wherein the mark is a through-hole penetrating the laminated film.
The mark is provided on the surface of the temporary protective film, a recess provided on the surface of the temporary protective film, a through hole provided in the temporary protective film, a dyed portion provided in the temporary protective film, and the surface of the temporary protective film. The laminated film according to claim 1, which is at least one selected from the group consisting of a colored layer.
The laminated film according to any one of claims 1 to 3, wherein a shape of the mark is at least one selected from the group consisting of a line, a cross, an arrow, an ellipse, and a polygon.
The laminated film according to any one of claims 1 to 4, wherein an outer shape of the laminated film is a circle or a regular polygon.
A step of providing a mark on a laminated film including a polarizing plate and a temporary protective film provided on one surface of the polarizing plate;
The laminated film comprises a peripheral region having a constant width from an end surface of the laminated film, and a central region inside the peripheral region,
When the area of the peripheral region is SP and the area of the central region is SC, the constant width is determined so as to satisfy SC / (SP + SC) ≦ 0.7,
In the step of providing the mark, the mark is provided in the central region.
The step of aligning the optical axis of the laminated film according to any one of claims 1 to 5 with respect to the image display panel with reference to the mark;
Bonding the laminated film aligned to the image display panel. A method for manufacturing an image display device.