TWI721173B - Laminated film, method of manufacturing laminated film with mark, and method of manufacturing image display device - Google Patents

Abstract

An objective of the present invention is to provide a laminated film which can further improve position alignment accuracy between image display panel and polarizing plate, and a method of manufacturing an image display device.

A laminated film 100 of the present invention includes a polarizing plate 10 and a temporary protective film 8 deposited on one surface of the polarizing plate 10. The laminated film 100 is provided with a peripheral region 100P with a specific width from the end face of the laminated film, and a central region 100C which is located inside the peripheral region 100P. The specific width is such determined as to satisfy SC/ (SP+SC) ≦ 0.7, where SP is the area of the peripheral region 100P, and SC is the area of the central region 100C. The central region 100C has an “M” mark.

Description

Method for manufacturing laminated film, laminated film with mark, and method for manufacturing image display device

The present invention relates to a method for manufacturing a laminated film, a laminated film with a mark, and a method for manufacturing an image display device.

Conventionally, a polarizing plate and a laminated film formed by providing a temporary protective film on one side surface of the polarizing plate are known. When laminating the laminated film on an image display panel such as a liquid crystal panel, the optical axis (transmission axis or absorption axis) of the polarizer of the laminated film must be aligned with the correct position of the image display panel.

Next, it is known to attach a mark to the end of the polarizing plate or to attach a mark to the end of the protective film in order to promote this positional alignment.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: WO2007/108244 Publication.

Patent Document 2: Japanese Patent Application Laid-Open No. 2005-266284.

However, in the prior method, the positioning accuracy of the image display panel and the polarizing plate is not sufficient.

The present invention has been accomplished in view of the above-mentioned problems, and its object is to provide a method for manufacturing a laminated film that can further improve the positioning accuracy of an image display panel and a polarizing plate, a laminated film with a mark, and a method for manufacturing an image display device.

The laminated film of the present invention includes a polarizing plate and a temporary protective film provided on one side surface of the polarizing plate. The laminated film has a peripheral area with a specific width from the end surface of the laminated film, and a central area on the inner side of the peripheral area. When the area of the aforementioned peripheral area is SP and the area of the aforementioned central area is SC, the aforementioned specific width is set to satisfy SC/(SP+SC)≦0.7. The aforementioned central domain has a mark.

According to the present invention, since the mark is provided in the center area, when the polarizing plate is attached to the image display panel, even if the peripheral area of the polarizing plate is curled, it is not affected by the curling, and the polarizing plate and the image can be displayed with high precision based on the mark. The position of the panel is aligned.

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

In addition, the mark may be formed by a dent provided on the surface of the temporary protective film, a through hole provided on the temporary protective film, a dyed part provided on the temporary protective film, and a coloring provided on the surface of the temporary protective film At least one selected from the group of layers.

In addition, the shape of the aforementioned mark can be at least one selected from the group consisting of a line, a cross, an arrow, an ellipse, and a polygon.

In addition, the outer shape of the laminated film may be a circle or a regular polygon.

The manufacturing method of the laminated film with a mark of the present invention has a step of placing a mark on the laminated film, and the laminated film is provided with a polarizing plate and a temporary protective film provided on one side surface of the polarizing plate.

The laminated film has a peripheral area with a specific width from the end surface of the laminated film, and a central area on the inner side of the peripheral area. When the area of the aforementioned peripheral area is SP and the area of the aforementioned central area is SC, the aforementioned specific width is set to satisfy SC/(SP+SC)≦0.7. In the step of setting the aforementioned mark, the aforementioned mark is placed on the aforementioned In the central area.

The manufacturing method of the image display device of the present invention includes the steps of aligning the optical axis of the laminated film with respect to the image display panel with reference to the aforementioned mark, and bonding the aligned laminated film to the image display Steps of the panel.

According to the present invention, it is possible to provide a laminated film that can further improve the positioning accuracy of an image display panel and a polarizing plate, and a method for manufacturing an image display device.

2: Polarizer

3: Protective film

5: Adhesive layer

7: Adhesive layer

8: Temporary protective film

9: separation membrane

10: Polarizing plate

20: Coloring layer

21: Dent

22: Through hole

90, 100: laminated film

100P: Peripheral area

100C: Central area

M, LCM1, LCM2: mark

In Figure 1, (a) is a cross-sectional view of a laminated film of an embodiment, and (b) is a plan view of (a).

Fig. 2 (a) and (b) are cross-sectional views of the laminated film of another embodiment.

Fig. 3 (a) to (e) are plan views respectively showing other examples of the mark shape of each laminated film.

(A) to (e) in Fig. 4 are top views of the laminated film of each other embodiment.

In Figure 5, (a) is a top view of the image display device, and (b) is a schematic cross-sectional view of the image display device.

Fig. 6 is a schematic plan view of the laminated film of the comparative example and the embodiment.

Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same parts or corresponding parts in each figure are given the same symbols, and repeated descriptions are omitted. In addition, the size ratio of each drawing may not be consistent with the actual, especially the depiction of the thickness is exaggerated.

<Laminated Film>

As shown in Fig. 1(a), the laminated film 100 of this embodiment has a polarizing plate 10, a temporary protective film 8 attached to one side surface of the polarizing plate 10 with an adhesive layer 7, and a layer on the polarizing plate 10 The other side surface is a separation film 9 bonded with an adhesive layer 7.

(Polarizer)

The polarizing plate 10 has a polarizer 2 and a protective film 3 attached to both sides of the polarizer 2 with an adhesive layer 5.

(Polarizer)

The material of the polarizer 2 can use the well-known materials conventionally used in the manufacture of polarizing plates, such as polyvinyl alcohol resin, polyvinyl acetate resin, ethylene/vinyl acetate (EVA) resin, polyamide resin, and polyester resin. Resin etc. Among them, polyvinyl alcohol-based resins are preferred. Generally, the starting material for manufacturing the polarizer 2 is, for example, an unstretched film of a polyvinyl alcohol resin film having a thickness of 5 to 100 μm, preferably 10 to 80 μm. The non-stretched film is subjected to dyeing treatment, boric acid treatment, stretching treatment, etc., to obtain a polarizer 2.

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

(Protective film)

The protective film 3 is a film for preventing cracks or scratches on the main surface or end of the polarizer 2.

The protective film 3 is preferably composed of various transparent resin films known in the field of polarizing plates. Examples include cellulose resins represented by cellulose triacetate, polyolefin resins represented by polypropylene resins, cyclic olefin resins represented by norbornene resins, and polymethyl Methyl acrylate-based resin is a representative example of acrylic resin, a polyethylene terephthalate-based resin is a representative example of polyester-based resin, and the like. Among them, cellulose resin is more representative.

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

The two protective films 3 attached to both sides of the polarizer 2 may be composed of the same material, or may be composed of different materials.

The protective film 3 may be a film that does not have an optical function, or may be a film having a so-called 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 in the manufacture of polarizing plates can be used. For example, from the viewpoints of weather resistance, refractive index, cationic polymerizability, etc., an epoxy resin that does not contain an aromatic ring in the molecule is preferred. Moreover, it is preferably cured by irradiating active energy rays (ultraviolet rays or heat rays).

The epoxy resin is preferably a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin, etc., for example. It is possible to add a polymerization initiator (for example, a photocationic polymerization initiator for polymerization by ultraviolet irradiation, a thermal cationic polymerization initiator for polymerization by heat ray irradiation) and other additives (sensitizers, etc.) to the epoxy resin , Used after preparing the epoxy resin composition for coating.

In addition, as the adhesive, acrylic resins such as acrylamide, acrylate, urethane acrylate, and epoxy acrylate, or polyvinyl alcohol-based water-based 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 may further include other optical layers laminated on the protective film 3. Other optical functional films include: reflective polarizing films that transmit a certain kind of polarized light and reflect polarized light showing the opposite property; Concave-convex shape film with anti-glare function; film with surface anti-reflection function; reflective film with reflection function on the surface; semi-transmissive reflective film with both reflection and transmission functions; viewing angle compensation film, etc.

(Temporary protective film)

The temporary protective film 8 is a film that can be peeled off from the polarizing plate 10 in a subsequent step together with the adhesive layer 7 to protect the surface of the protective film 3 from damage when the laminated film 100 is processed when it is pasted on an image display element. , Wear and other films. The temporary protective film 8 can maintain the state of being attached to the protective film 3 after being laminated on the protective film 3 to before using the polarizing plate 10. Before using the polarizing plate 10, when the temporary protective film 8 is peeled off from the protective film 3, the adhesive layer 7 is attached to the temporary protective film 8 side and peeled off together with the temporary protective film 8 from the polarizing plate 10 side.

The material of the temporary protective film 8 is preferably polyester resin such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and polybutylene terephthalate. Use the same as the protective film 3. As long as it has the necessary strength and optical compatibility, other plastic films can be used, such as polyolefin film, polyacetate film, polycarbonate film, polyphenylene sulfide film, polyamide film, polyvinyl chloride film, vinyl /Vinyl acetate copolymer film, various liquid crystal polymer films, etc.

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 adhesive layer 7 may be composed of acrylic resin, or silicone resin, polyester, polyurethane, polyether, or the like.

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

The method of providing the adhesive layer 7 includes, for example, forming an adhesive on the temporary protective film 8 with acrylic one-component or two-component adhesives, rubber-based adhesives, and silicone-based adhesives. After the agent layer 7, the protective film 3 is laminated. Usually, it is prepared to temporarily wind the temporary protective film laminate into a roll shape. The temporary protective film laminate system provides an adhesive layer on the temporary protective film and a release film on the adhesive layer. Before bonding with the protective film 3, The release film was peeled off from the temporary protective film laminate, and bonded to the protective film 3.

In addition, the protective film 3 of the polarizing plate 10 may be coated with a solution containing the above-mentioned resin or any additional components to provide the adhesive layer 7, and then the temporary protective film 8 may be attached.

(Separation membrane)

The separation film 9 is a peelable film pasted for the purpose of protecting the adhesive layer 7 or preventing foreign matter from adhering, and is peeled off when the laminated film 100 is used to expose the adhesive layer 7. The separation membrane 9 may be composed of, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, and a polyester resin such as polyethylene terephthalate. Among them, a stretched film of polyethylene terephthalate is preferred.

The adhesive layer 7 laminated with the separation membrane 9 is composed of other things The layer that functions when the polarizing plate 10 is attached to the product (for example, liquid crystal cell, touch panel). The material of the adhesive layer 7 can be the same as when the temporary protective film 8 is laminated.

The separation film 9 can be subjected to a mold release treatment with silicone resin or the like on the junction surface of the adhesive layer 7, so that the laminated film 100 can be easily peeled off during use. If the separation film 9 is peeled off, the adhesive layer 7 will remain on the polarizing plate 10 side.

The thickness of the separation membrane 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. 1(a), the outer shape of the laminated film 100 is circular when viewed from the laminated direction. The film with a larger width can be cut with a laser or a knife, thereby making it easy to obtain such a shape.

(mark)

When viewed from the thickness direction of the laminated film 100, the laminated film 100 includes a peripheral area 100P having a specific width from the end surface of the laminated film 100, and a central area 100C inside the peripheral area 100P. Here, when the area of the peripheral area 100P is SP and the area of the central area 100C is SC, the specific width is set to satisfy SC/(SP+SC)≦0.7. Here it is preferably SC/(SP+SC)≦0.6, more preferably SC/(SP+SC)≦0.5, still more preferably SC/(SP+SC)≦0.4, particularly preferably SC/(SP+ SC)≦0.3.

In this embodiment, there is a mark M in the central area 100C. Specifically, the mark M is provided on the colored layer 20 on the surface of the temporary protective film 8. The colored layer 20 can be used by, for example, a printing device such as an inkjet printer form. The colored layer may contain coloring components such as resins, pigments, and dyes.

The mark M is not limited to the colored layer 20. Figure 2 (a) and (b) show other aspects of the mark M. In (a) of FIG. 2, the mark M is a dent 21 provided on the temporary protective film 8. In this way, the dent 21 can be easily formed by a laser, a knife edge, or the like. In Figure 2(a), the depth of the dent 21 is the depth that does not expose the adhesive layer 7, but the adhesive layer 7 can also be exposed, which can be a through hole, as shown by the dashed line in Figure 2(a) Shown as a through hole, the through hole penetrates the temporary protective film 8 and the adhesive layer 7 in such a way that the protective film 3 is exposed by penetrating the temporary protective film 8 and the adhesive layer 7. In addition, in (b) of FIG. 2, the mark M denotes a through hole 22 penetrating the entire build-up film 100. In addition, the mark M may be, for example, a dyeing part provided on the temporary protective film 8.

The shape of the mark M in Figure 1 (a) is a cross with one side line longer than the other side line. The shape of the mark M is not limited to a cross. For example, it can be the linear shape shown in Figure 3 (a), the arrow shape shown in Figure 3 (b), or the ellipse shown in Figure 3 (c), or it can be The triangle shown in (d) of Fig. 3 (preferably excluding equilateral triangles) may also be the rhombus shown in (e) of Fig. 3 (preferably excluding squares). It may also be other polygons (preferably excluding regular polygons). In addition, each polygon is preferably not a regular polygon, but when it is a regular polygon, it is only necessary to set a plural mark.

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

Mark M indicates the light absorption of polarizer 2 of polarizer 10 The direction of the receiving axis or the light transmission axis (optical axis). For example, make the long axis direction of the mark M parallel to the light absorption axis or the light transmission axis (for example, the upper and lower directions of (b) in Fig. 1 and (a) to (e) in Fig. 4) to make the mark M The mark M is set so that the long axis direction and the optical axis of the polarizer have a specific angular relationship, so that the position of the optical axis of the polarizer can be easily determined according to the direction of the mark M (long axis direction, etc.). In addition, for example, the mark M is arranged such that the center of gravity of the mark M overlaps with the position of the center of gravity of the laminated film 100, and the position of the mark M is set at a specific position relative to the laminated film, so that the position of the mark M can be detected. The position of the laminated film (polarizing plate 10) in the in-plane direction.

Another example of the mark M of the laminated film 100 will be described. The laminated film 100 shown in Fig. 4(a) is provided with a through hole h with a circular cross section in the central part, and the mark M is provided at two positions on both sides of the through hole h. Only the (a) in Fig. 3 is provided ) The form of the two ends of the line.

Next, other examples of the outer shape of the laminated film 100 will be described. The outer shape of the laminated film 100 can be square (refer to Fig. 4(b)), regular hexagon (refer to Fig. 4(c)), and regular octagon (refer to Fig. 4(d)). Polygons can also be shaped like a bottle (see (e) in Figure 4). For example, if it is a regular polygon or a circle, the optical axis direction cannot be determined from the outer shape, so the effect of the present invention is extremely high.

In either aspect, the mark M is set in the central area 100C. It is sufficient that at least a part of the mark M is provided in the central area 100C, but it is preferable that all the marks M are present in the central area 100C.

Herein, the laminated film after the separation film 9 is peeled off by the laminated film 100 is referred to as the laminated film 90.

<Method of Manufacturing Image Display Device>

Next, a method of manufacturing an image display device using the above-mentioned laminated film 100 will be described with reference to (a) and (b) of FIG. 5.

First, the image display panel 50 is prepared. An example of an image display panel to which a polarizing plate must be pasted can be a liquid crystal panel or an organic EL panel.

Next, the laminated film 90 remaining after the separation film 9 is peeled off from the above-mentioned laminated film 100 is stuck on the surface of the image display panel 50. At this time, it is necessary to set the optical axis of the polarizing plate 10 in a specific direction, and stick the laminated film 90 to a specific position on the surface of the image display panel 50.

In this embodiment, a pair of marks LCM1 showing a preferred optical axis direction is provided on the surface of the image display panel 50, and a pair of marks LCM2 showing a preferred optical axis direction is provided on the inner surface of the image display panel 50.

In this embodiment, first, the separation film 9 is peeled off from the laminated film 100 to form the laminated film 90. Then, according to the shape of the mark M, the rotation direction of the laminated film 90 is aligned with a specific direction. Specifically, for example, the laminated film 90 may be rotated so that the long axis direction of the mark M is parallel to the direction in which the pair of marks LCM1 of the image display panel are connected to each other. In addition, according to the position of the mark M, the in-plane direction position of the laminated film 90 is aligned at a specific 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 moved to the middle of the pair of marks LCM1. After aligning the rotation position and the in-plane position of the laminated film 90 with respect to the image display panel 50 in this way, the laminated film 90 is pasted on the image display surface through the adhesive layer 7 板50 surface.

The pasting step including such a position alignment step can be realized by a position alignment device, which includes: a camera that shoots the mark, an image processing device that confirms the shape and position of the mark according to the captured image, and calculates the necessary according to the processing result A movement control device for the amount of rotation and necessary movement, and a robot arm for moving the laminated film 90. Image processing and movement control can be processed by computer.

Next, the separation film 9 is peeled off from another laminated film 100 to form another laminated film 90. According to the mark M of the laminated film 90 and a pair of marks LCM2 on the inner surface of the image display panel 50, the laminated film 90 is adhered to The inner surface of the image display panel 50.

Thereby, the optical axis and position of the pair of laminated films 90, 90 pasted on the image display panel 50 are aligned at the desired position. For example, the optical axes of the polarizers of a pair of laminated films may be arranged so as to cross each other at right angles.

<function>

The laminated film 100 (90) containing the polarizer is easy to curl in the peripheral area. Therefore, if the mark M is provided in the peripheral area of the laminated film 100 (90), the position of the mark M may be shifted due to the influence of curling, which may reduce the accuracy of position alignment with the image display panel.

However, according to this embodiment, the mark M is provided in the center area 100C of the laminated film 100 (90). Therefore, when the mark M is referenced by camera or visual observation, the deviation of the position recognition of the mark M can be reduced. Therefore, the rotation position or the in-plane direction of the laminated film 90 can be relative to the image display panel 50 for high-precision alignment.

Examples of the layer composition of the laminated film 100 that is easy to curl in the peripheral area include: the laminated film has a thin thickness (especially less than 200μm) and low rigidity; the two protective films 3 attached to the two sides of the polarizer 2 are different. Materials (for example, one is cellulose resin such as cellulose triacetate, and the other is cyclic olefin resin); when either one does not have the protective film 3; and the transparency of any layer constituting the laminated film 100 When the humidity is high (for example, 250g/m ² .24h or more). In addition, when the outer shape of the laminated film 100 has sharp corners, the surrounding area tends to curl. The laminated film 100 having such a layer structure and/or outer shape is prone to curling in the peripheral area, so the effect of the present invention is extremely high.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments. For example, in the above-mentioned embodiment, the adhesive layer 7 and the separation film 9 are provided on the side opposite to the temporary protective film 8 of the polarizing plate 10, but it can be implemented even if there is no such thing. For example, when sticking to an image display panel, sometimes an adhesive is provided on the side of the image display panel, and the protective film of the laminated film 100 is directly stuck to the adhesive or the like.

In addition, the adhesive layer 7 may not be provided between the temporary protective film 8 and the protective film 3.

(Example) (Comparative Examples 1 to 3, Examples 1, 2)

As shown in Fig. 6, a rectangular laminated film 100 of 120 mm×70 mm is prepared. The total thickness of the laminated film 100 is 270 μm, and has the following configuration.

Temporary protective film 8 (polyethylene terephthalate)/adhesive layer 7 (acrylic resin)/protective film 3 (cellulose triacetate)/adhesive layer 5 (epoxy resin)/polarizer 2 (iodine) Dyeing stretched PVA)/adhesive layer 5 (epoxy resin)/protective film 3 (cellulose triacetate)/adhesive layer 7 (acrylic resin)/separation film 9 (polyethylene terephthalate).

When the laminated film 100 is placed on a flat surface, the end portion will be lifted from the flat surface due to curling, and the most warped part is about 6 mm (about 5% relative to the long side) from the flat surface.

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

The mark M is set in such a way that the vertical bars of the cross mark M are parallel to the short sides of the laminated film 100 and the horizontal bars are parallel to the long sides of the laminated film 100.

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

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

The laminated film of each comparative example and embodiment placed on a flat plate is photographed with a camera from above to confirm whether the cross mark M can be confirmed correctly shape. The results are shown in Table 1.

When the cross mark M is not deformed and can be confirmed, it is represented as ○, when the cross mark M is slightly deformed but can be confirmed, it is represented as △, and when the cross mark is confirmed to be greatly deformed, it is represented as ×.

If there is a mark in the center area 100C where SC/(SP+SC) is 0.7 or less, it is confirmed that the mark can be recognized with high accuracy.

2: Polarizer

3: Protective film

5: Adhesive layer

7: Adhesive layer

8: Temporary protective film

9: separation membrane

10: Polarizing plate

20: Coloring layer

90, 100: laminated film

100P: Peripheral area

100C: Central area

M: mark

Claims (5)

A laminated film is provided with a polarizing plate and a temporary protective film provided on one side surface of the polarizing plate; the laminated film has a peripheral area with a specific width from the end surface of the laminated film and is more inside than the peripheral area When the area of the aforementioned peripheral area is SP and the area of the aforementioned central area is SC, the aforementioned specific width is set to satisfy SC/(SP+SC)≦0.7; the aforementioned central area has a mark; the aforementioned mark is From the through hole that penetrates the laminated film, the dent provided on the surface of the temporary protective film, the through hole that is provided in the temporary protective film but does not penetrate the polarizing plate, and the dyeing part is provided in the temporary protective film For at least one selected from the group, the aforementioned peripheral area does not have the aforementioned mark. The laminated film described in the first item of the scope of patent application, wherein the shape of the aforementioned 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 described in item 1 or item 2 of the scope of patent application, wherein the outer shape of the laminated film is a circle or a regular polygon. A manufacturing method of a laminated film with a mark includes a step of placing a mark on a laminated film provided with a polarizing plate and a temporary protective film provided on one side surface of the polarizing plate; the laminated film is provided from the end surface of the laminated film Specific width The peripheral area of the degree and the central area that is more inside than the aforementioned peripheral area; when the area of the aforementioned peripheral area is SP and the area of the aforementioned central area is SC, the aforementioned is set to satisfy SC/(SP+SC)≦0.7 A specific width; in the step of setting the aforementioned mark, the aforementioned mark is placed in the aforementioned central area; the aforementioned mark is formed by a through hole penetrating the aforementioned laminated film, a dent provided on the surface of the aforementioned temporary protective film, and placed on the aforementioned temporary protection The film has at least one selected from the group consisting of the through hole of the polarizing plate and the dyeing part arranged in the temporary protective film, and the peripheral area does not have the aforementioned mark. A method for manufacturing an image display device includes: referring to the aforementioned mark in the laminated film as described in any one of the scope of the patent application, and aligning the optical axis of the aforementioned laminated film with respect to the image display panel The step of aligning; and the step of attaching the aligned laminated film to the image display panel.

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