KR20190032449A - Optical film of every leaf - Google Patents

Abstract

Provided is a sheet-like optical film capable of suitably producing an optical display panel having the same structure even when a roll-to-panel method or a sheet-to-panel method is used when a thin optical function film is bonded to an optical cell . A two-layered optical film 2 in which a release film 21, a pressure-sensitive adhesive layer 22, an optical functional film 23, a first surface protective film 24, and a second surface protective film 25 are laminated in this order, , And the magnitude of each interlaminar peeling force in the optical film (2) pertaining to each leaf is the same as the interlaminar peeling force A between the release film and the pressure-sensitive adhesive layer, the interlaminar peeling force B between the pressure-sensitive adhesive layer and the optical functional film, A, B, C and D are the interlaminar peeling force C of the first surface protective film and the interlayer peeling force D of the first surface protective film and the second surface protective film.

Description

Optical film of every leaf

The present invention relates to a sheet-like optical film, for example, to a sheet-like optical film used in a sheet-to-panel production facility.

A release film, a pressure-sensitive adhesive layer, an optical function film (typically, a polarizing film), and a surface protective film in this order. The optical film fed from the roll-like optical film is cut in the width direction (half cut) in the pressure-sensitive adhesive layer, the optical function film and the surface protective film while leaving the release film, the release film is peeled off from the optical film obtained by cutting, (Hereinafter also referred to as a "roll-to-panel method") in which an optical film is bonded to an optical cell through an exposed pressure-sensitive adhesive layer (see, for example, Patent Documents 1 and 2).

On the other hand, as a bonding method of an optical film different from the roll-to-panel method, a method in which an optical film previously made in a sheet state is bonded to an optical cell through a pressure-sensitive adhesive layer exposed by peeling off a release film To-panel method ") (see, for example, Patent Document 3).

Japanese Patent Application Laid-Open No. 2011-123208 Japanese Patent Application Laid-Open No. 2015-049115 Japanese Patent Application Laid-Open No. 2006-039238

However, in the field of production of optical display panels including liquid crystal display panels, there has been a new case in which an optical display panel having the same structure is manufactured by using both a roll-to-panel method as well as a sheet-to-panel method. For example, Patent Document 2 discloses that an optical display panel is continuously manufactured using a roll-to-panel method, and a rework process is performed on an optical display panel determined to be a defective product. When not much defective products occur, it is conceivable to use a sheet-to-panel method when bonding a new optical functional film to an optical cell in such a rework process. Further, for example, in a case where a large quantity of optical display panels having the same configuration is to be produced in a short period of time, it is also conceivable to use the sheet-to-panel method in combination with the roll-to-panel method.

2. Description of the Related Art Recently, with the progress of thinning of optical display panels, polarizing films and thinner optical function films (for example, polarizing films having a thickness of 60 탆 or less) have been developed. Such a thin optically functional film has low elasticity (modulus of elasticity), torsion, curling, and the like.

According to the roll-to-panel method, a thin optical function film is transported to a bonding position in a state of being laminated on a carrier film (release film), the optical function film is peeled off from the carrier film (release film) In order to bond the functional film to the optical cell, a thin optically functional film can be continuously bonded to the optical cell while suppressing occurrence of twist, curl, and the like. However, in the sheet-to-panel method, it is difficult to carry out handling such as transfer of the optically functional film in sheet form, peeling of the release film, and bonding treatment of the optically functional film to the liquid crystal cell, I am concerned.

INDUSTRIAL APPLICABILITY The present invention relates to a sheet-like optical film capable of suitably producing an optical display panel having the same structure even when a roll-to-panel method or a sheet-to-panel method is used in combination with a thin optical function film to an optical cell .

The present invention is a sheet-like optical film in which a release film, a pressure-sensitive adhesive layer, an optical functional film, a first surface protective film and a second surface protective film are laminated in this order,

The large-and-small relationship between the interlayer delaminating forces in the optical film of each leaf,

The delaminating force A between the releasing film and the pressure-sensitive adhesive layer,

The delamination force B between the pressure-sensitive adhesive layer and the optical functional film,

The delamination force C between the optical function film and the first surface protective film,

When the delamination force D between the first surface protective film and the second surface protective film is set to D,

A < B, A < C and A < D.

In the above invention, the magnitude of the peeling force is preferably A <D <C? B or A <D <B? C, more preferably A <D <C <B.

In the above invention, the optically functional film may be a polarizing film.

In the above invention, the polarizing film may have a thickness of 60 탆 or less.

In the above invention, the polarizing film may have a polarizer having a thickness of 10 m or less.

In the above invention, the first surface protection film may have a first base film and a first pressure-sensitive adhesive layer, and may be laminated on the optically functional film through the first pressure-sensitive adhesive layer.

In the above invention, the first surface protection film may be a self-adhesive type film.

In the above invention, the second surface protection film may have a second base film and a second pressure-sensitive adhesive layer, and may be laminated on the first surface protection film through the second pressure-sensitive adhesive layer.

In the above invention, the second surface protection film may be a self-adhesive type film.

The sheet-like optical film of the present invention is used in a sheet-to-panel manner. The optical film having the second surface protection film provided thereon is improved in handling properties and can be manufactured in a sheet-to-panel manner while suppressing occurrence of twisting, curling, etc., can do. Then, by removing (for example, peeling off) the second surface protective film from the optical film on each leaf joined to the optical display panel, as a result, An optical display panel can be manufactured. That is, according to the optical film of the present invention, the optical film of the present invention can be suitably used even when a roll-to-panel method or a sheet-to- .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an optical film set of Embodiment 1. Fig.
2 is a schematic diagram of a production system in a roll-to-panel fashion.
3 is a schematic view of a sheet-to-panel production system;

<Optical film of every leaf>

First, a set of the optical film on each leaf and the optical film on the roll used in the present invention will be described. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an optical film on each leaf and an optical film on a roll; 1, a side view, a plan view and a partial sectional enlarged view of the first optical film 1 on the roll are shown. 1 shows a side view, a plan view, and a partial cross-sectional enlarged view of the first optical film 2 on a leaf form. The roll-shaped first optical film 1 is obtained by laminating the first release film 11, the first pressure-sensitive adhesive layer 12, the first optical function film 13 and the first surface protection film 14 in this order have.

The roll-like first optical film (1) is used for producing an optical display panel in a roll-to-panel manner. In this case, the first optical film 10 of the width a, which is fed from the first optical film 1 on the roll, is cut off by leaving the release film 11 at a predetermined interval b in the cutting means C. The symbol s is a notch formed by the cutting on the first optical film 10.

The first optical film 2 on each leaf has a first release film 21, a first pressure-sensitive adhesive layer 22, a first optical function film 23, a first surface protection film 24, And a surface protective film 25 are laminated in this order. The size of the first optical film 2 on each leaf is the length a and the width b. The first optical film (2) in a sheet form is used for producing an optical display panel in a sheet-to-panel manner.

In this embodiment, the first release film 11 and the first release film 21 have the same structure. The first pressure-sensitive adhesive layer (12) and the first pressure-sensitive adhesive layer (22) have the same constitution. The first optical function film 13 and the first optical function film 23 have the same configuration. The first surface protection film 14, the first surface protection film 24, and the second surface protection film 25 have the same structure. The "same configuration" means that the material, thickness, and the like are not only completely the same but also substantially the same (for example, the same in manufacturing quality).

In the present embodiment, the first surface protection film 14 (or 24) has the first base film and the first pressure-sensitive adhesive layer, and the first optical function film 13 (or 23 ). Further, as another embodiment, the first surface protection film 14 (or 24) may be a self-adhesive type film.

In the present embodiment, the second surface protective film 25 has the second base film and the second pressure sensitive adhesive layer, and is laminated on the first surface protective film 24 through the second pressure sensitive adhesive layer. Further, as another embodiment, the second surface protection film 25 may be a self-adhesive type film.

(Relation of peel strength between phases)

The interlayer peeling force between the first surface protective film 24 and the first optical functional film 23 is larger than the interlayer peeling force between the second surface protective film 25 and the first surface protective film 24. According to this, the second surface protective film 25 can be more smoothly peeled off. As the measurement of the peeling force, for example, a tensile tester can be used. The peeling condition is measured by 180 deg. Peeling at 0.3 m / min. The peeling force is controlled by the composition and thickness of the pressure-sensitive adhesive.

The magnitude of each interlaminar peeling force in the first optical film (2) of each leaf is as follows.

The interlayer peeling force A between the first release film 21 and the first pressure-sensitive adhesive layer 22,

The interlayer peeling force B between the first pressure sensitive adhesive layer 22 and the first optical function film 23,

The interlayer peeling force C between the first optical function film 23 and the first surface protective film 24,

When the interlayer peeling force D between the first surface protective film 24 and the second surface protective film 25 is set,

A < B, A < C and A < D.

Preferably, A <D <C? B or A <D <B? C.

More preferably, A < D < C < B.

According to the relationship of the interphase peeling force, peeling of the second surface protection film can be suppressed when the first release film peels off.

<Optical Function Film>

The first optical function films 13 and 23 are not particularly limited as long as they are films having optical functions, and examples thereof include polarizing films, retardation films, brightness enhancing films, and diffusion films, but they are typically polarizing films.

(Polarizing film)

In this embodiment, from the viewpoint of thinning, it is preferable to use a polarizing film having a thickness (total thickness) of 60 m or less, more preferably 55 m or less, and further preferably 50 m or less. Examples of the polarizing film include (1) a structure in which a protective film (sometimes referred to as a polarizer protective film) is laminated on both sides of the polarizer (sometimes referred to as a "polarizing film"), (2) (Sometimes referred to as &quot; protective polarizing film &quot;) in which a protective film is laminated only on one side of the protective film.

(Polarizer)

As the polarizer, a polyvinyl alcohol-based resin is used. As the polarizer, a dichroic substance such as iodine or a dichroic dye is adsorbed on a hydrophilic polymer film such as a polyvinyl alcohol film, a partially porous polyvinyl alcohol film, or an ethylene / vinyl acetate copolymerization system partial saponification film to form a 1 Polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, and the like. Among them, a polarizer comprising a polyvinyl alcohol-based film and a dichroic substance such as iodine is suitable.

The polarizer obtained by dying a polyvinyl alcohol film with iodine and uniaxially stretching can be produced by, for example, dying polyvinyl alcohol in an aqueous solution of iodine and stretching it to 3 to 7 times its original length. If necessary, it may contain boric acid, zinc sulfate, zinc chloride or the like, and may be immersed in an aqueous solution such as potassium iodide. If necessary, the polyvinyl alcohol film may be dipped in water and washed with water before dyeing. By washing the polyvinyl alcohol film with water, it is possible not only to clean the surface of the polyvinyl alcohol film surface and the antiblocking agent but also to swell the polyvinyl alcohol film to prevent unevenness such as uneven dyeing. Stretching may be performed after dyeing with iodine, stretching while dyeing, or stretching, followed by dyeing with iodine. It can be stretched in an aqueous solution such as boric acid or potassium iodide or in a water bath.

From the viewpoint of thinning, the thickness of the polarizer is preferably 10 탆 or less, more preferably 8 탆 or less, further preferably 7 탆 or less, further preferably 6 탆 or less. On the other hand, the thickness of the polarizer is preferably 2 탆 or more, more preferably 3 탆 or more. Such a thin polarizer is excellent in durability against thermal shock because it has less thickness unevenness, excellent visibility, and small dimensional change. On the other hand, in a polarizing film including a polarizer having a thickness of 10 탆 or less, the elasticity (elastic modulus) of the film is remarkably lowered, and therefore there is a high possibility that twisting, curling and the like are caused in the sheet-to-panel method. Therefore, the present invention is particularly suitable for the polarizing film.

As a thin polarizer, typically,

Japanese Patent No. 4751486,

Japanese Patent No. 4751481,

Japanese Patent No. 4815544,

Japanese Patent No. 5048120,

International Publication No. 2014/077599 pamphlet,

International Publication No. 2014/077636 pamphlet,

And the like, or a thin polarizer obtained from the production method described in these.

The polarizer is characterized in that the optical characteristics represented by the simple transmittance T and the polarization degree P satisfy the following equation

P > - (10 ^0.929 T ^-42.4 -1) x 100 (T <42.3), or

P? 99.9 (with T? 42.3)

Is satisfied. The polarizer structured to satisfy the above conditions uniquely has the performance required as a liquid crystal TV display using a large display element. Specifically, it has a contrast ratio of 1000: 1 or more and a maximum luminance of 500 cd / m 2 or more. As another use, for example, it is bonded to the viewer side of the organic EL cell.

As the thin polarizer, it is possible to stretch at a high magnification ratio in the process including a stretching process and a dyeing process in the state of a laminate, so that the polarizing performance can be improved. Japanese Patent No. 4751486, Japanese Patent No. 4751481 In the aqueous solution of boric acid as described in the specification of Japanese Patent No. 4815544, and in particular, it is preferable to use a method of stretching in an aqueous solution of boric acid described in Japanese Patent No. 4751481 and Japanese Patent No. 4815544 And a step of pneumatically stretching the film beforehand. These thin polarizers can be obtained by a manufacturing method including a step of drawing a polyvinyl alcohol-based resin (hereinafter also referred to as a PVA-based resin) layer and a lead resin base material in the form of a laminate and a step of dyeing. With this method, even if the PVA resin layer is thin, it can be stretched without any problem such as breakage due to stretching because it is supported on the resin base material for drawing.

(Protective film (polarizer protective film))

The material constituting the protective film is preferably excellent in transparency, mechanical strength, thermal stability, water barrier property, isotropy and the like. For example, a polyester polymer such as polyethylene terephthalate or polyethylene naphthalate, a cellulose polymer such as diacetylcellulose or triacetylcellulose, an acrylic polymer such as polymethyl methacrylate, a polystyrene or an acrylonitrile styrene copolymer (AS resin), and polycarbonate-based polymers. Examples of the polymer include polyolefin polymers such as polyethylene, polypropylene, polyolefin having a cyclo or norbornene structure, ethylene / propylene copolymer, amide polymers such as vinyl chloride polymers, nylon and aromatic polyamides, imide polymers, Based polymers, polyether sulfone-based polymers, polyether sulfone-based polymers, polyether ether ketone-based polymers, polyphenylene sulfide-based polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers, Epoxy-based polymers or blends of the above-mentioned polymers may also be mentioned as examples of the polymer forming the protective film.

The protective film may contain one or more optional additives. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, colorants and the like. The content of the thermoplastic resin in the transparent protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, particularly preferably 70 to 97% by weight, to be. When the content of the thermoplastic resin in the transparent protective film is 50% by weight or less, high transparency and the like inherently possessed by the thermoplastic resin may not be sufficiently exhibited.

As the protective film, a retardation film, a brightness enhancement film, a diffusion film, or the like can be used.

A functional layer such as a hard coating layer, an antireflection layer, an anti-sticking layer, a diffusion layer, or an anti-glare layer may be formed on the surface of the protective film on which the polarizer is not adhered. The functional layers such as the hard coating layer, the antireflection layer, the anti-sticking layer, the diffusion layer, and the antiglare layer may be provided on the transparent protective film itself or may be provided separately from the transparent protective film .

(Interposed layer)

The protective film and the polarizer are laminated via an intervening layer such as an adhesive layer, a pressure-sensitive adhesive layer, and a primer layer (primer layer). At this time, it is preferable to stack the both without air gap by the interposition layer.

The adhesive layer is formed by an adhesive. The kind of the adhesive is not particularly limited, and various ones can be used. The adhesive layer is not particularly limited as long as it is optically transparent. As the adhesive, any of various types such as an aqueous base, a solvent base, a hot melt base, an active energy ray curable base and the like is used, but an aqueous base adhesive or an active energy ray curable adhesive is suitable.

Examples of the water-based adhesive include an isocyanate adhesive, a polyvinyl alcohol adhesive, a gelatin adhesive, a vinyl-based latex system, and a water-based polyester. The water-based adhesive is usually used as an adhesive containing an aqueous solution, and usually contains 0.5 to 60% by weight of solids.

The active energy ray curable adhesive is an adhesive which is cured by an active energy ray such as electron beam, ultraviolet ray (radical curing type, cation curing type), and can be used, for example, in an electron beam hardening type or an ultraviolet ray hardening type. As the active energy ray curable adhesive, for example, a photo-radical curable adhesive may be used. When a photo-radical curing type active energy ray-curable adhesive is used as an ultraviolet curing type, the adhesive contains a radical polymerizing compound and a photopolymerization initiator.

Further, in the lamination of the polarizer and the protective film, an easy adhesion layer can be formed between the transparent protective film and the adhesive layer. The adhesion facilitating layer can be formed by various resins having, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone system, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, . These polymer resins may be used singly or in combination of two or more. Further, other additives may be added to form the adhesion-facilitating layer. Specifically, stabilizers such as a tackifier, ultraviolet absorber, antioxidant, heat stabilizer and the like may be used.

The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive. As the pressure-sensitive adhesive, various pressure-sensitive adhesives can be used. Examples of the pressure-sensitive adhesive include a rubber pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a vinyl alkyl ether pressure-sensitive adhesive, a polyvinylpyrrolidone pressure-sensitive adhesive, a polyacrylamide pressure- have. Depending on the kind of the pressure-sensitive adhesive, a tacky base polymer is selected. Among these pressure-sensitive adhesives, an acrylic pressure-sensitive adhesive is preferably used because it has excellent optical transparency, exhibits appropriate wettability, cohesiveness and adhesiveness with adhesiveness, and is excellent in weather resistance and heat resistance.

The primer layer (primer layer) is formed to improve the adhesion between the polarizer and the protective film. The material constituting the primer layer is not particularly limited as long as it can exert a strong adhesion to the base film and the polyvinyl alcohol-based resin layer to some extent. For example, a thermoplastic resin having excellent transparency, thermal stability, stretchability and the like is used. Examples of the thermoplastic resin include an acrylic resin, a polyolefin resin, a polyester resin, a polyvinyl alcohol resin, and mixtures thereof.

(Surface protective film)

The first and second surface protective films are provided on one side of the polarizing film (surface on which the pressure-sensitive adhesive layer is not laminated) in the optical film, and protect the optical function film such as a polarizing film.

As the base film of the first and second surface protective films, a film material having isotropy or near isotropy is selected from the viewpoints of inspection property and manageability. Examples of the film material include a polyester resin such as a polyethylene terephthalate film, a cellulose resin, an acetate resin, a polyether sulfone resin, a polycarbonate resin, a polyamide resin, a polyimide resin, A transparent polymer such as a polyolefin resin and an acrylic resin. Among these, a polyester resin is preferable. The base film may be used as a laminate of one kind or two or more kinds of film materials, or a stretched product of the film may be used. The thickness of the base film is preferably 10 to 150 mu m, more preferably 20 to 100 mu m.

The first and second surface protective films may be those having the base film and the pressure-sensitive adhesive layer, in addition to the base film can be used as a self-adhesive film. It is preferable that the first and second surface protective films have a pressure-sensitive adhesive layer from the viewpoint of protecting an optical functional film such as a polarizing film.

Examples of the pressure-sensitive adhesive layer used in the lamination of the first and second surface protective films include a pressure-sensitive adhesive layer in which a polymer such as a (meth) acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, Can be appropriately selected and used. From the viewpoint of transparency, weather resistance, heat resistance and the like, an acrylic pressure-sensitive adhesive using an acrylic polymer as a base polymer is preferable. The thickness (dry film thickness) of the pressure-sensitive adhesive layer is determined according to the required adhesive force. And is usually about 1 to 100 mu m, preferably 5 to 50 mu m.

In the first and second surface protective films, a release treatment layer can be formed on the opposite surface of the surface on which the pressure-sensitive adhesive layer is formed by a low-adhesion material such as silicone treatment, long-chain alkyl treatment or fluorine treatment.

<Pressure-sensitive adhesive layer>

For forming the pressure-sensitive adhesive layers 12 and 22, a suitable pressure-sensitive adhesive may be used, and the kind thereof is not particularly limited. Examples of the pressure-sensitive adhesive include rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone pressure-sensitive adhesives, urethane pressure-sensitive adhesives, vinyl alkyl ether pressure-sensitive adhesives, polyvinyl alcohol pressure-sensitive adhesives, polyvinylpyrrolidone pressure-sensitive adhesives, polyacrylamide pressure-sensitive adhesives, and cellulosic pressure-sensitive adhesives.

Among these pressure-sensitive adhesives, those having excellent optical transparency, suitable wettability, cohesiveness and adhesiveness, and excellent weather resistance and heat resistance are preferably used. An acrylic pressure-sensitive adhesive is preferably used as this feature.

As a method of forming the pressure-sensitive adhesive layers 12 and 22, for example, a method may be employed in which a pressure-sensitive adhesive is peeled off from a release film (applied to a separator or the like, A method of applying the pressure-sensitive adhesive to a polarizer (or a transparent protective film), and drying and removing a polymerization solvent or the like to form a pressure-sensitive adhesive layer on the polarizer. In the application of the pressure-sensitive adhesive, At least one solvent other than the polymerization solvent may be newly added.

As the releasing film subjected to the peeling treatment, a silicone peeling liner is preferably used. As a method for drying the pressure-sensitive adhesive in the process of applying and drying the pressure-sensitive adhesive of the present invention on such a liner and forming the pressure-sensitive adhesive layer, a suitable and appropriate method may be adopted depending on the purpose. Preferably, a method of over-drying the coating film is used. The heat drying temperature is preferably 40 占 폚 to 200 占 폚, more preferably 50 占 폚 to 180 占 폚, and particularly preferably 70 占 폚 to 170 占 폚. By setting the heating temperature within the above range, a pressure-sensitive adhesive having excellent adhesive properties can be obtained.

The drying time can be appropriately set at an appropriate time. The drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.

As the method of forming the first pressure-sensitive adhesive layers 12 and 22, various methods are used. Specific examples of the coating composition include a coating composition such as a roll coating, kiss roll coating, gravure coating, reverse coating, roll brush, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, An extrusion coating method and the like.

The thickness of the first pressure sensitive adhesive layer 12, 22 is not particularly limited and is, for example, about 1 to 100 탆. The thickness is preferably 2 to 50 占 퐉, more preferably 2 to 40 占 퐉, and still more preferably 5 to 35 占 퐉.

<Release film>

The first release films 11 and 21 protect the pressure-sensitive adhesive layer until they are provided for practical use. Examples of the constituent material of the release film include plastic films such as polyethylene, polypropylene, polyethylene terephthalate and polyester film, porous materials such as paper, cloth and nonwoven fabric, nets, foamed sheets, metal foils and laminate thereof A suitable paper-like material, and the like, but a plastic film is suitably used because of its excellent surface smoothness.

The plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer, and examples thereof include a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, A copolymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.

The thickness of the first release films 11 and 21 is usually about 5 to 200 占 퐉, and preferably about 5 to 100 占 퐉. If necessary, the separator may also be subjected to antistatic treatment such as releasing treatment with a releasing agent of silicon, fluorine, long chain alkyl or fatty acid amide type, silica powder, antistatic treatment, coating type, incorporation type, and vapor deposition type. Particularly, the releasability from the pressure-sensitive adhesive layer can be further improved by suitably carrying out the peeling treatment such as the silicone treatment, the long-chain alkyl treatment or the fluorine treatment on the surface of the release film.

(Liquid crystal cell, liquid crystal display panel)

The liquid crystal cell has a structure in which a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side) Pa) and a second substrate (a back side) Pb which are arranged to face each other. Any type of liquid crystal cell can be used, but in order to realize a high contrast, it is preferable to use a liquid crystal cell of a vertical alignment (VA) mode or an intra-plane switching (IPS) mode. In a liquid crystal display panel, a polarizing film is bonded to one or both surfaces of a liquid crystal cell, and a driving circuit is incorporated as necessary.

(Organic EL cell, organic EL display panel)

The organic EL cell has a structure in which an electroluminescent layer is sandwiched between a pair of electrodes. As the organic EL cell, for example, a top emission type, a bottom emission type, and a double emission type can be used. In the organic EL display panel, a polarizing film is bonded to one or both sides of an organic EL cell, and a driving circuit is built in if necessary.

(Roll-to-panel manufacturing system)

Fig. 2 shows a manufacturing system of a roll-to-panel type optical display panel using the first optical film 1 on the roll. In the present embodiment, a liquid crystal cell is described as an optical cell and a liquid crystal display panel is described as an optical display panel.

The roll-shaped first optical film 1 is obtained by laminating the first release film 11, the first pressure-sensitive adhesive layer 12, the first optical function film 13 and the first surface protection film 14 in this order have. As shown in Fig. 1, the first optical film 1 on the roll has a width a and a width corresponding to a long side of the liquid crystal panel (substantially shorter than a long side of the liquid crystal cell P).

As shown in Fig. 2, the manufacturing system of the liquid crystal display panel according to the present embodiment includes a first conveying section 81 for conveying the liquid crystal cell P to the first attaching section 64, And a second conveying section 82 for conveying the liquid crystal cell P after the first optical film 1 on the roll is used to attach the optical film to P1. Each conveying section is configured to have a plurality of conveying rollers R for conveying the liquid crystal cell P by rotating about a rotation axis parallel to the direction perpendicular to the conveying direction. Further, it may have an adsorption plate or the like other than the conveying roller.

(Liquid Crystal Cell Transporting Step)

The liquid crystal cell P is arranged in the first conveying section 81 so that the first surface P1 is the ceiling surface from the storage section 91 storing the liquid crystal cell P and the first attachment section 64).

(The first optical film feeding step, the first optical film cutting step)

The strip-shaped first optical film 10 fed from the first optical film 1 on the roll is cut off from the cut portion 61 while the first release film 11 side is being adsorbed and fixed (The length along the short side of the liquid crystal cell P (the length of the short side of the liquid crystal cell P, which is substantially shorter than the short side) ) To form the cut-out portion s. The cutting by the cutting portion 61 may be, for example, cutting using a blade (cutting with a cutting blade), or cutting with a laser device. An example of the cut-in portion s after cutting is shown by an arrow in Fig. 2, but the cut-in is enlarged in order to facilitate the explanation. A nip roller (not shown) may be arranged on the upstream side or the downstream side of the cut portion 61 to convey the first optical film 10 in the strip. Further, the nip roller may be disposed on the upstream side and the downstream side of the cut portion 61.

(Tension adjusting process)

In order to make continuous processing possible so that the treatment is not interrupted for a long time in the cutting process of the first optical film 10 in the strip and the attachment process at the rear end, (62) are provided. The first tension adjusting unit 62 is configured with a dancer mechanism using, for example, a weight. A nip roller (not shown) may be disposed on the upstream side or the downstream side of the first tension adjusting portion 62, and the first optical film 10 may be transported. Further, the nip roller may be arranged on the upstream side and the downstream side of the first tension adjusting portion 62.

(Peeling process)

The first optical film 10 is folded and inverted by the first peeling section 63 so that the first optical film 10 is peeled off from the first release film 11. The first release film 11 is wound on the roll by the first winding section 65. [ The first winding section 65 has a roll and a rotation drive section, and the rotation drive section rotates the roll to wind the first release film 11 on the roll. A nip roller (not shown) may be disposed on the upstream side or the downstream side of the peeling section 63, and the first optical film 10 or the first release film 11 may be transported. Further, the nip roller may be disposed on the upstream side and the downstream side of the peeling section 63.

(First attaching step)

The first attaching portion 64 conveys the first optical film 10 on which the first release film 11 has been peeled off to the first surface P1 of the liquid crystal cell P while moving the first pressure sensitive adhesive layer 12). The first attachment portion 64 is constituted by a pair of first roller 64a and second roller 64b. Either one may be a drive roller and the other may be a driven roller, and both rollers may be a drive roller. The first optical film 10 and the liquid crystal cell P are sandwiched and supported downstream by a pair of the first roller 64a and the second roller 64b so that the first optical film 10 is separated from the liquid crystal cell P And is attached to the first surface P1. The liquid crystal cell P after the first optical film 10 is attached to the first surface P1 of the liquid crystal cell P is conveyed downstream in the second conveying section 82. [

(Sheet-to-panel manufacturing system)

Fig. 3 shows a manufacturing system of a sheet-to-panel type optical display panel using the first optical film 2 of each leaf form. In the present embodiment, a liquid crystal cell is described as an optical cell and a liquid crystal display panel is described as an optical display panel.

The first optical film 2 on a sheet-like surface comprises a first release film 21, a first pressure-sensitive adhesive layer 22, a first optical function film 23, a first surface protection film 24, Films are stacked in this order. As shown in FIG. 1, the first optical film 2 on each leaf is a longitudinal a and a b, and has a width corresponding to a long side of the liquid crystal panel (a width substantially shorter than a long side of the liquid crystal cell P) .

As shown in Fig. 3, the liquid crystal display panel manufacturing system according to this embodiment includes a third conveying unit 181 for conveying the liquid crystal cell P to the sheet attachment apparatus 164 (corresponding to the second attachment unit) , And a fourth transport section (182) for transporting the liquid crystal cell (P) after attaching the optical film to the first surface (P1) of the liquid crystal cell (P) using the first optical film (2). Each conveying section is configured to have a plurality of conveying rollers R for conveying the liquid crystal cell P by rotating about a rotation axis parallel to the direction perpendicular to the conveying direction. Further, it may have an adsorption plate or the like other than the conveying roller.

(Liquid Crystal Cell Transporting Step)

The liquid crystal cell P is arranged in the third conveying section 181 such that the first surface P1 is a ceiling surface from the storage section 191 for housing the liquid crystal cell P, .

The first optical film 2 in a leaf form is sucked from the container 100 housing the first optical film 2 on the leaf side to the suction portion 164a of the sheet attachment device 164 and supplied to the bonding position . The first release film 21 is peeled from the first optical film 2 on the leaf side by the peeling means. The adsorption face of the adsorption portion 164a is in the shape of an arc of one section. The peeling means may peel off the first release film 21 by, for example, adhering the adhesive tape to the first release film 21 surface by using an adhesive tape and moving the adhesive tape by a moving mechanism.

The sheet attachment device 164 has a fixing surface 164b and the fixing surface 164b sucks and fixes the first surface P1 side of the liquid crystal cell P. [ The second optical film 2 in a leaf form in which the first release film 21 is peeled off and the first pressure sensitive adhesive layer 22 is exposed is wound on the first surface P1 of the liquid crystal cell P to sweep the absorption portion 164a Respectively.

(Second surface protective film peeling step)

After attaching the first optical film 2 on each leaf, the second surface protective film 25 is peeled off. The peeling treatment may be performed manually or by a peeling apparatus.

In the roll-to-panel production system (Fig. 2), the optical film is attached to one surface (first surface P1) of the liquid crystal cell in a roll-to-panel manner, but the invention is not limited thereto. The optical film may be attached to the other surface (second surface P2) of the liquid crystal cell by a roll-to-panel method or a sheet-to-panel method.

In the sheet-to-panel production system (Fig. 3), the optical film is attached to one surface (first surface P1) of the liquid crystal cell in a sheet-to-panel manner, but the invention is not limited thereto. The optical film may be attached to the other surface (second surface P2) of the liquid crystal cell by a roll-to-panel method or a sheet-to-panel method.

In the production system of the roll-to-panel method and the sheet-to-panel method, the optical inspection may be performed after attaching the optical film to either one side or both sides. The optical film is removed from the liquid crystal cell (optical cell) according to the result of the optical inspection (for example, in the case of a defective product), and the optical cell is reattached The liquid crystal display panel (optical display panel) may be remanufactured.

(Modified example)

In the present embodiment, the optical film set of the roll-shaped optical film and the optical film of each leaf is used for the continuous production method of the liquid crystal display panel. However, the present invention is not limited to this and the continuous production method of the organic EL display panel .

In the embodiments, the optical film described above is used as the optical film on the roll, but the configuration of the optical film on the roll is not limited thereto. For example, the release film may be removed and a strip-shaped optical film in which a plurality of strip lines are formed in the width direction may be wound (an optical film into which a perforated line is inserted) may be used.

In the embodiment, the optical film on the strip is cut (half cut) at a predetermined interval in the width direction. However, in order to improve the yield, the optical film on the strip is cut in the width direction The optical film including the defect portion may be cut to a size smaller than a predetermined interval (the size of the optical cell) (more preferably, as small as possible).

Although the liquid crystal cell and the liquid crystal display panel are described as examples of the liquid crystal cell and the liquid crystal display panel in the form of a horizontally elongated rectangular liquid crystal cell and a liquid crystal display panel in the embodiment, the shape of the liquid crystal cell and the liquid crystal display panel may be a shape having a pair of opposing sides There is no particular limitation.

1: Optical film on roll
11: release film
12: pressure-sensitive adhesive layer
13: Optical functional film
14: First surface protective film
2: Optical film of every leaf
21: release film
22: pressure-sensitive adhesive layer
23: Optical functional film
24: First surface protective film
25: Second surface protective film

Claims (10)

An optical film, a release film, a pressure-sensitive adhesive layer, an optical functional film, a first surface protection film and a second surface protection film laminated in this order,
The large-and-small relationship between the interlayer delaminating forces in the optical film of each leaf,
The delaminating force A between the releasing film and the pressure-sensitive adhesive layer,
The delamination force B between the pressure-sensitive adhesive layer and the optical functional film,
The delamination force C between the optical function film and the first surface protective film,
When the delamination force D between the first surface protective film and the second surface protective film is set to D,
A <B, A <C, A <D. The method according to claim 1,
A <D <C? B or A <D <B? C. The method according to claim 2, wherein the magnitude of the peeling force
A < D < C < B. The optical film according to any one of claims 1 to 3, wherein the optical function film is a polarizing film. The optical film of claim 4, wherein the polarizing film has a thickness of 60 탆 or less. The optical film of claim 4 or 5, wherein the polarizing film has a polarizer with a thickness of 10 m or less. The optical compensation film according to any one of claims 1 to 6, wherein the first surface protection film comprises a first base film and a first pressure-sensitive adhesive layer and is laminated on the optically functional film through the first pressure-sensitive adhesive layer It is characterized by the optical film of every leaf. The optical film according to any one of claims 1 to 6, wherein the first surface protection film is a self-adhesive type film. The image display device according to any one of claims 1 to 8, wherein the second surface protection film has a second base film and a second pressure-sensitive adhesive layer and is laminated on the first surface protection film through the second pressure- Wherein the optical film comprises a plurality of optical fibers. The optical film according to any one of claims 1 to 8, wherein the second surface protection film is a self-adhesive type film.

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