CN109478383B - Method and system for manufacturing optical display panel - Google Patents
Method and system for manufacturing optical display panel Download PDFInfo
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- CN109478383B CN109478383B CN201780045237.3A CN201780045237A CN109478383B CN 109478383 B CN109478383 B CN 109478383B CN 201780045237 A CN201780045237 A CN 201780045237A CN 109478383 B CN109478383 B CN 109478383B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Provided is a method for manufacturing an optical display panel, wherein when a thin optical functional film is bonded to an optical element, optical display panels having the same structure can be suitably manufactured even when a roll-to-panel method and a sheet-to-panel method are used in combination. The manufacturing method of the optical display panel comprises the following steps: a first panel manufacturing step of using a rolled optical film to attach the optical film to one surface of an optical element 1; and a 2 nd panel manufacturing step of attaching a sheet-like optical film to one surface of the optical element. The 2 nd panel manufacturing process includes the following steps: the pressure-sensitive adhesive layer exposed by peeling the release film is peeled with the sheet-like optical film interposed therebetween, the sheet-like optical film is attached to one surface of the optical element, and the 2 nd surface-protecting film is peeled from the sheet-like optical film attached to the optical element, the sheet-like optical film having a structure in which the release film, the pressure-sensitive adhesive layer, the optical functional film, the 1 st surface-protecting film, and the 2 nd surface-protecting film are laminated in this order.
Description
Technical Field
The present invention relates to a method for manufacturing an optical display panel and a system for manufacturing an optical display panel.
Background
An optical film, in which a release film, an adhesive layer, an optical functional film (typically, a polarizing film) and a surface protective film are laminated in this order, is configured in a roll form. The method comprises the following steps: a method (hereinafter, also referred to as a "roll to panel" method ") in which an optical film released from the rolled optical film is cut (half-cut) with a release film left in the width direction, the release film is peeled from the optical film obtained by the cutting, and the optical film is bonded to an optical element via the exposed release film (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-roll panel method, there is a method of: a method of bonding an optical film in a sheet state prepared in advance to an optical element via an adhesive layer exposed by peeling off a release film (hereinafter, also referred to as a "sheet to panel (sheet) method") (for example, see patent document 3).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-123208
Patent document 2: japanese laid-open patent publication No. 2015-049115
Patent document 3: japanese patent laid-open publication No. 2006-039238
Disclosure of Invention
Problems to be solved by the invention
Currently, a manufacturing plant for optical display panels holds a large number of sheet-to-panel manufacturing facilities, and a small number of roll-to-roll panel manufacturing facilities.
In recent years, as the thickness of optical display panels has been reduced, optical functional films (for example, polarizing films having a thickness of 60 μm or less) thinner than conventional ones have been developed, as typified by polarizing films. Such an optical functional film has low rigidity (elastic modulus) and is likely to be twisted or curled. Therefore, the current sheet-to-panel manufacturing facility is concerned about being unable to cope with.
In addition, at the manufacturing site of optical display panels represented by liquid crystal display panels, there is a new case where optical display panels having the same structure are manufactured not only by the roll-to-roll panel method but also by the sheet-to-sheet panel method. For example, patent document 2 discloses: optical display panels are continuously manufactured by a roll-to-roll panel method, and the optical display panels determined to be defective are subjected to a rework process. It is conceivable that: when defective products are not so large, a sheet-to-panel method is used when a new optical functional film is bonded to the optical element in the above-described rework process. In addition, it is also conceivable: for example, when optical display panels having the same structure must be mass-produced in a short time, the roll-to-roll panel system cannot provide the entire supply amount, and the sheet-to-panel system is used in combination.
However, as described above, since the thinner the optical film, the more likely it is to be twisted or curled, in the sheet-to-panel system, handling such as conveyance of the sheet-like optical film, peeling of the release film, and bonding of the optical functional film to the liquid crystal cell is difficult, and thus there is a concern that the yield may be significantly reduced.
An object of the present invention is to provide a method for manufacturing an optical display panel, which can suitably manufacture an optical display panel having the same structure even when a roll-to-panel method and a sheet-to-panel method are used in combination when a thin optical functional film is bonded to an optical element.
Means for solving the problems
The invention relates to a method for manufacturing an optical display panel, which comprises a 1 st panel manufacturing procedure and a 2 nd panel manufacturing procedure,
the 1 st panel manufacturing process includes: a first sticking step of forming an optical display panel by using a rolled optical film formed by winding a strip-shaped optical film and sticking the optical film to at least one surface of an optical element,
the 2 nd panel manufacturing process includes: a 2 nd attaching step of attaching a sheet-like optical film to at least one surface of the optical element to form an optical display panel,
in the first attaching step 1, the adhesive is applied to the substrate,
and attaching the optical film to at least either one of the surfaces of the optical element with the pressure-sensitive adhesive layer exposed by peeling the release film from the tape-shaped optical film, which is released from the rolled optical film and has a structure in which the release film, the pressure-sensitive adhesive layer, the optical functional film, and the 1 st surface protective film are laminated in this order,
in the above-mentioned 2 nd attaching step,
a pressure-sensitive adhesive layer exposed by peeling a release film from the sheet-like optical film having a structure in which the release film, the pressure-sensitive adhesive layer, the optically functional film, the 1 st surface protective film and the 2 nd surface protective film are laminated in this order, and the sheet-like optical film is attached to at least one surface of the optical element,
the 2 nd panel manufacturing step includes: a 2 nd surface protective film peeling step of peeling the 2 nd surface protective film from the sheet-like optical film in a state of being attached to the optical element.
In the above invention, the first attaching step 1 includes: a cutting step of cutting the tape-shaped optical film discharged from the rolled optical film, while leaving the release film in a direction orthogonal to the longitudinal direction of the optical film; and the combination of (a) and (b),
a peeling step of peeling the release film from the optical film.
In the above invention, the tape-shaped optical film is formed with cuts at predetermined intervals in addition to the release film,
the first attaching step 1 may include: and a peeling step of folding back the release film to the inside from the optical film released from the rolled optical film, thereby peeling the release film.
In addition, another technical proposal is a manufacturing system of the optical display panel, which comprises a 1 st panel manufacturing part and a 2 nd panel manufacturing part,
the 1 st panel manufacturing part includes: a 1 st attaching part for attaching a rolled optical film formed by winding a belt-shaped optical film to at least one surface of an optical element to form an optical display panel,
the 2 nd panel manufacturing part includes: a 2 nd attaching part for attaching a sheet-like optical film to at least one surface of the optical element to form an optical display panel,
the 1 st attaching part attaches the optical film to the at least one surface of the optical element with the adhesive layer exposed by peeling the release film from the strip-shaped optical film, which is released from the rolled optical film and has a structure in which the release film, the adhesive layer, the optical functional film, and the 1 st surface protective film are laminated in this order,
the 2 nd sticking section sticks the sheet-like optical film to at least either one of the surfaces of the optical element with the pressure-sensitive adhesive layer exposed by peeling the release film from the sheet-like optical film, the sheet-like optical film having a structure in which the release film, the pressure-sensitive adhesive layer, the optical functional film, the 1 st surface protective film and the 2 nd surface protective film are laminated in this order,
the 2 nd panel manufacturing unit may include a 2 nd surface protection film peeling unit configured to peel the 2 nd surface protection film from the sheet-like optical film attached to the optical element.
In the above invention, the 1 st sticking portion may have:
a cutting section for cutting the tape-shaped optical film discharged from the rolled optical film, leaving the release film in a direction orthogonal to a longitudinal direction of the optical film; and
a peeling section for peeling the release film from the optical film.
In the above invention, the tape-shaped optical film is formed with cuts at predetermined intervals in addition to the release film,
the 1 st sticking portion may have a peeling portion which peels off the optical film by folding back the release film from the optical film released from the rolled optical film to the inside.
In the above invention, when a polarizing film is used as the optical functional film, the 1 st optical functional film, the 2 nd optical functional film, or when a polarizing film is included as one member of the structure thereof, the absorption axis direction of the strip-shaped polarizing film may be parallel to the longitudinal direction of the strip-shaped polarizing film, may be orthogonal to the longitudinal direction, or may be inclined (for example, a direction forming an angle of 45 ° with respect to the longitudinal direction). The absorption axis direction of the rectangular sheet-like polarizing film may be parallel to the longitudinal direction, may be orthogonal to the longitudinal direction, or may be oblique (for example, a direction forming an angle of 45 ° with respect to the longitudinal direction). The absorption axis direction of the square sheet-like polarizing film may be parallel to any one side or may be oblique (for example, a direction forming an angle of 45 ° with respect to the side).
In the present invention, the pressure-sensitive adhesive layer, the optical functional film, and the surface protective film may be cut in the roll-like optical film with the release film left, at intervals corresponding to the other set of sides facing the optical element, along the direction (width direction) orthogonal to the longitudinal direction of the optical film. According to this structure, it is not necessary to cut (half-cut) the optical film in the roll-to-roll panel system.
In the above invention, the optical element may be a VA-mode or IPS-mode liquid crystal cell or an organic EL cell.
The shape of the optical element is not particularly limited, and may be a square or a rectangle as long as it has a pair of sides facing each other and a pair of sides facing each other. It should be noted that, in general, one set of opposing sides of the optical element is orthogonal to the other set of opposing sides.
The "roll-to-roll panel system" is a system in which a release film is peeled off from an optical film unwound from a rolled optical film, and the optical film is bonded to an optical element with an exposed pressure-sensitive adhesive layer interposed therebetween. Here, the optical film may be formed with slits at a predetermined interval so that the release film remains in the width direction until the release film is peeled. The optical film may be provided with a slit before the release film is released, or the optical film may be provided with a slit after the release film is released and before the release film is peeled.
The "sheet-to-panel system" is a system in which a release film is peeled from an optical film in a sheet state prepared in advance, and the optical film is bonded to an optical element with an exposed pressure-sensitive adhesive layer interposed therebetween.
ADVANTAGEOUS EFFECTS OF INVENTION
The rolled optical film is used for manufacturing an optical display panel having a structure in which an adhesive layer, an optical functional film, and a 1 st surface protective film are sequentially laminated on at least one surface of an optical element by using a roll-to-roll panel method. Further, the sheet-like optical film provided with the 2 nd surface protection film is improved in handling property, and therefore, is used for manufacturing an optical display panel having a structure in which a pressure-sensitive adhesive layer, an optical functional film, and the 1 st surface protection film are sequentially laminated on at least any one surface of an optical element, using a sheet-to-panel method, while suppressing the occurrence of twist, curl, and the like. Then, the 2 nd surface protective film is removed (for example, peeled) from the sheet-like optical film bonded to the optical display panel. As a result, an optical display panel having the same laminated structure as an optical display panel manufactured by a roll-to-roll panel method can be manufactured even in a sheet-to-panel method.
Drawings
Fig. 1 is a schematic view showing an optical film assembly of embodiment 1.
Fig. 2 is a schematic view of a roll-to-roll panel type manufacturing system.
Fig. 3 is a schematic view of a sheet-to-panel manufacturing system.
Detailed Description
< optical film Assembly >
First, an optical film module used in the present invention will be described. FIG. 1 is a schematic diagram illustrating an optical pellicle assembly. The upper part of fig. 1 shows a side surface, a top view, and a partial cross-sectional enlarged view of the 1 st optical film 1 in a roll form. The lower part of fig. 1 shows a side view, a top view, and a partial cross-sectional enlarged view of the 1 st optical film 2 in a sheet form. The 1 st optical film 1 in a roll form is laminated with a 1 st release film 11, a 1 st pressure-sensitive adhesive layer 12, a 1 st optical functional film 13, and a 1 st surface protective film 14 in this order.
The 1 st optical film 1 in a roll form is used to manufacture an optical display panel in a roll-to-roll panel manner. In this case, the 1 st optical film 10 in a band shape having the width a and being discharged from the 1 st optical film 1 in a roll shape is cut by the cutting unit C with the 1 st release film 11 left at the predetermined interval b. The symbol s denotes a notch formed in the 1 st optical film 10 by the cutting.
Further, the 1 st optical film 2 in a sheet form is laminated with a 1 st release film 21, a 1 st pressure-sensitive adhesive layer 22, a 1 st optical functional film 23, a 1 st surface protective film 24, and a 2 nd surface protective film 25 in this order. The size of the sheet-like 1 st optical film 2 is a length a and a width b. The sheet-like 1 st optical film 2 is used to manufacture an optical display panel in a sheet-to-panel manner.
In the present embodiment, the 1 st release film 11 and the 1 st release film 21 have the same configuration. The 1 st adhesive layer 12 and the 1 st adhesive layer 22 have the same structure. The 1 st optical functional film 13 has the same structure as the 1 st optical functional film 23. The 1 st surface protection film 14, the 1 st surface protection film 24, and the 2 nd surface protection film 25 are the same in structure. The "same structure" does not mean that the material, thickness, and the like are completely the same, and may be substantially the same (for example, the same in manufacturing quality).
In the present embodiment, the 1 st surface protection film 14 (or 24) has a 1 st base film and a 1 st adhesive layer, and is laminated on the 1 st optical functional film 13 (or 23) with the 1 st adhesive layer interposed therebetween. In other embodiments, the 1 st surface protection film 14 (or 24) may be a self-adhesive film.
In the present embodiment, the 2 nd surface protection film 25 has a 2 nd base film and a 2 nd adhesive layer, and is laminated on the 1 st surface protection film 24 with the 2 nd adhesive layer interposed therebetween. In another embodiment, the 2 nd surface protection film 25 may be a self-adhesive film.
(relationship between interlayer peeling force)
The peeling force between the 1 st surface protection film 24 and the 1 st optical functional film 23 is larger than the peeling force between the 2 nd surface protection film 25 and the 1 st surface protection film 24. With this structure, the 2 nd surface protection film 25 can be peeled off more smoothly. As the measurement of the peeling force, for example, a tensile tester can be used. The peeling condition was measured by 180 ℃ peeling at 0.3 m/min. The peel force is controlled by the composition, thickness, etc. of the adhesive.
The relationship between the magnitude of the peeling force between the layers of the sheet-like 1 st optical film 2 is as follows.
The 1 st release film 21 and the 1 st pressure-sensitive adhesive layer 22 have an interlayer peeling force of A,
The 1 st pressure-sensitive adhesive layer 22 and the 1 st optical functional film 23 have an interlayer peeling force of B,
The 1 st optical functional film 23 and the 1 st surface protective film 24 have an interlayer peeling force of C,
When the interlayer peeling force between the 1 st surface protective film 24 and the 2 nd surface protective film 25 is D,
A<B、A<C、A<D。
preferably A < D < C ≦ B or A < D < B ≦ C.
More preferably a < D < C < B.
According to the relationship between the interlayer peeling forces, the peeling of the 2 nd surface protection film can be suppressed when the 1 st release film is peeled.
< optical functional film >
The 1 st optical functional film 13, 23 is not particularly limited as long as it has an optical function, and examples thereof include: a polarizing film, a retardation film, a brightness enhancement film, a diffusion film, and the like, and a typical polarizing film is used.
(polarizing film)
In the present embodiment, a polarizing film having a thickness (total thickness) of 60 μm or less is preferably used from the viewpoint of reduction in thickness, more preferably 55 μm or less, and still more preferably 50 μm or less. Examples of the polarizing film include: (1) a structure in which protective films (sometimes referred to as "polarizer protective films") are laminated on both sides of a polarizer (sometimes referred to as "two-protective polarizing films"); (2) a structure in which a protective film is laminated only on one side of a polarizer (sometimes referred to as a "single-protection polarizing film").
(polarizing member)
As the polarizing material, a polarizing material made of a polyvinyl alcohol resin can be used. Examples of the polarizing material include: a polarizing material obtained by uniaxially stretching a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or an ethylene-vinyl acetate copolymer partially saponified film, a polyene-based oriented film such as a dehydrated polyvinyl alcohol film or a desalted polyvinyl chloride film, or the like, to which a dichroic substance such as iodine or a dichroic dye is adsorbed. Among these, a polarizer containing a polyvinyl alcohol film and a dichroic material such as iodine is preferable.
The polarizer obtained by uniaxially stretching a polyvinyl alcohol film dyed with iodine can be produced, for example, by immersing the polyvinyl alcohol film in an aqueous iodine solution to dye the film and stretching the film to 3 to 7 times the original length. If necessary, boric acid, zinc sulfate, zinc chloride, etc. may be contained, and the composition may be immersed in an aqueous solution of potassium iodide, etc. If necessary, the polyvinyl alcohol film may be washed with water by immersing it in water before dyeing. The polyvinyl alcohol film can be washed with water to wash contaminants and an anti-blocking agent on the surface of the polyvinyl alcohol film, and the polyvinyl alcohol film can be swollen to prevent unevenness such as uneven dyeing. The stretching may be performed after the dyeing with iodine, or may be performed while dyeing, or may be performed after the stretching with iodine. Stretching may also be carried out in an aqueous solution of boric acid, potassium iodide, or the like, or in a water bath.
From the viewpoint of thinning, the thickness of the polarizing plate is preferably 10 μm or less, more preferably 8 μm or less, even more preferably 7 μm or less, and even more preferably 6 μm or less. On the other hand, the thickness of the polarizer is preferably 2 μm or more, and more preferably 3 μm or more. Such a thin polarizer has excellent durability against thermal shock because of its excellent visibility with little thickness variation and small dimensional change. On the other hand, in a polarizing film including a polarizer having a thickness of 10 μm or less, since the rigidity (elastic modulus) of the film is significantly low, there is a high possibility that torsion, curling, or the like occurs in the sheet-to-panel system. Therefore, the present invention is particularly suitable for the polarizing film.
Typical examples of the thin polarizer include:
japanese patent No. 4751486,
Japanese patent No. 4751481,
Japanese patent No. 4815544,
Japanese patent No. 5048120,
WO 2014/077599,
International publication No. 2014/077636 pamphlet
And the like, or a thin polarizer obtained by the production method described in these documents.
The optical properties of the polarizer, expressed by the monomer transmittance T and the polarization degree P, preferably satisfy the following formula
P>-(100.929T-42.4-1) × 100 (wherein, T<42.3), or,
P is more than or equal to 99.9 (wherein, T is more than or equal to 42.3)
The condition (2) is defined as follows. A polarizer configured to satisfy the above conditions clearly has performance required as a display for a liquid crystal television using a large display element. Specifically, contrast ratio 1000: 1 or more and a maximum luminance of 500cd/m2The above. For another use, for example, the organic EL element may be bonded to the visible side of the organic EL unit.
As the above-mentioned thin polarizer, among the production methods including the step of stretching in a state of a laminate and the step of dyeing, in particular, from the viewpoint of being stretchable to a high magnification and being capable of improving polarizing performance, it is preferable to use a polarizer obtained by a production method including the step of stretching in an aqueous boric acid solution as described in japanese patent No. 4751486, japanese patent No. 4751481, and japanese patent No. 4815544, and particularly preferable to use a polarizer obtained by a production method including the step of performing auxiliary in-air stretching before stretching in an aqueous boric acid solution as described in patent No. 4751481 and patent No. 4815544. These thin polarizers can be obtained by a production method including a step of stretching a polyvinyl alcohol resin (hereinafter, also referred to as PVA resin) layer and a stretching resin base material in a state of a laminate, and a step of dyeing. In this production method, even if the PVA-based resin layer is thin, the PVA-based resin layer can be supported by the resin base material for stretching without causing troubles such as breakage due to stretching.
(protective film (polarizer protective film))
As a material constituting the protective film, a material excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like is preferable. Examples thereof include: polyester polymers such AS polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such AS cellulose diacetate and cellulose triacetate, acrylic polymers such AS polymethyl methacrylate, styrene polymers such AS polystyrene and acrylonitrile-styrene copolymers (AS resins), and polycarbonate polymers. Examples of the polymer forming the protective film include: polyethylene, polypropylene, polyolefin having a ring system or a norbornene structure, polyolefin-based polymer such as an ethylene-propylene copolymer, vinyl chloride-based polymer, polyamide-based polymer such as nylon or aromatic polyamide, imide-based polymer, sulfone-based polymer, polyether ether ketone-based polymer, polyphenylene sulfide-based polymer, vinyl alcohol-based polymer, vinylidene chloride-based polymer, vinyl butyral-based polymer, aryl ester-based polymer, polyoxymethylene-based polymer, epoxy-based polymer, or a blend of the above-mentioned polymers.
The protective film may contain 1 or more kinds of any appropriate additives. Examples of additives include: ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, anti-coloring agents, 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, and particularly preferably 70 to 97% by weight. When the content of the thermoplastic resin in the transparent protective film is less than 50% by weight, there is a fear that high transparency and the like originally possessed by the thermoplastic resin cannot be sufficiently exhibited.
As the protective film, a retardation film, a brightness enhancement film, a diffusion film, or the like can be used.
The protective film may be provided with a functional layer such as a hard coat layer, an antireflection layer, an anti-sticking layer, a diffusion layer, or an antiglare layer on the surface to which the polarizer is not bonded. The functional layers such as the hard coat layer, the antireflection layer, the release layer, the diffusion layer, and the antiglare layer may be provided on the transparent protective film itself or may be provided separately as a member different from the transparent protective film.
(holding layer)
The protective film and the polarizer are laminated with an adhesive layer, and an undercoat layer (primer layer) interposed therebetween. In this case, it is preferable that the both are laminated without an air gap by the sandwiching layer.
The adhesive layer is formed of an adhesive. The type of the adhesive is not particularly limited, and various adhesives can be used. The adhesive layer is not particularly limited as long as it is optically transparent, and various types of adhesives such as aqueous, solvent, hot melt, and active energy ray-curable adhesives can be used as the adhesive, but an aqueous adhesive or an active energy ray-curable adhesive is suitable.
Examples of the aqueous adhesive include: isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latex-based adhesives, water-based polyesters, and the like. The aqueous adhesive is usually used in the form of an adhesive containing an aqueous solution, and usually contains 0.5 to 60% by weight of a solid content.
The active energy ray-curable adhesive is an adhesive that is cured by an active energy ray such as an electron ray or ultraviolet ray (radical-curable type or cation-curable type), and can be used in the form of, for example, an electron ray-curable type or an ultraviolet ray-curable type. As the active energy ray-curable adhesive, for example, a photo radical-curable adhesive can be used. When a photo radical curing active energy ray-curable adhesive is used as the ultraviolet curing adhesive, the adhesive contains a radical polymerizable compound and a photopolymerization initiator.
When the polarizer and the protective film are laminated, an easy-adhesion layer may be provided between the transparent protective film and the adhesive layer. The easy-adhesion layer can be formed of various resins having, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone skeleton, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, or the like. These polymer resins may be used alone in 1 kind, or in combination with 2 or more kinds. In addition, other additives may be added to the formation of the easy adhesion layer. Specifically, a thickener, an ultraviolet absorber, a stabilizer such as an antioxidant or a heat stabilizer, and the like may be further used.
The adhesive layer is formed of an adhesive. As the binder, various binders can be used, and examples thereof include: rubber-based adhesives, acrylic adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl pyrrolidone-based adhesives, polyacrylamide-based adhesives, cellulose-based adhesives, and the like. The adhesive base polymer is selected according to the kind of the aforementioned adhesive. Among the above-mentioned adhesives, acrylic adhesives are preferably used from the viewpoint of excellent optical transparency, excellent adhesive properties exhibiting suitable wettability, cohesion and adhesiveness, weather resistance, heat resistance and the like.
The undercoat layer (primer layer) is formed to improve adhesion between the polarizer and the protective film. The material constituting the primer layer is not particularly limited as long as it exerts a certain degree of strong adhesion force to both the base film and the polyvinyl alcohol resin layer. For example, a thermoplastic resin having excellent transparency, thermal stability, stretchability, and the like can be used. Examples of the thermoplastic resin include: an acrylic resin, a polyolefin resin, a polyester resin, a polyvinyl alcohol resin, or a mixture thereof.
(surface protective film)
The 1 st and 2 nd surface protection films are provided on one surface (surface on which the pressure-sensitive adhesive layer is not laminated) of the polarizing film in the optical film, and protect the optical functional film such as the polarizing film.
The base film of the 1 st or 2 nd surface protection film may be selected from isotropic or nearly isotropic film materials from the viewpoint of inspection properties, manageability, and the like. Examples of the film material include: transparent polymers such as polyester resins, cellulose resins, acetate resins, polyether sulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, and acrylic resins, such as polyethylene terephthalate films. Among these, polyester resins are preferred. The base film may be used in the form of a laminate of 1 or 2 or more kinds of film materials, and a stretched product of the film may be used. The thickness of the base film is preferably 10 to 150 μm or less, and more preferably 20 to 100 μm.
The 1 st and 2 nd surface protecting films may be those using the base film as a self-adhesive film, or those having the base film and an adhesive layer. From the viewpoint of protecting an optical functional film such as a polarizing film, a film having an adhesive layer is preferably used as the 1 st and 2 nd surface protective films.
As the pressure-sensitive adhesive layer used for laminating the 1 st and 2 nd surface protective films, for example, a pressure-sensitive adhesive using a polymer such as a (meth) acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer as a base polymer can be suitably selected and used. From the viewpoint of transparency, weather resistance, heat resistance and the like, an acrylic adhesive containing an acrylic polymer as a base polymer is preferred. The thickness (dry film thickness) of the pressure-sensitive adhesive layer is determined in accordance with the desired adhesive strength. Usually about 1 to 100. mu.m, preferably about 5 to 50 μm.
The 1 st and 2 nd surface protection films may be provided with a release-treated layer on the side opposite to the side on which the pressure-sensitive adhesive layer is provided, by a low-adhesion material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment.
< adhesive layer >
The adhesive layers 12 and 22 can be formed using an appropriate adhesive, and the type thereof is not particularly limited. Examples of the binder include: rubber-based adhesives, acrylic adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinyl pyrrolidone-based adhesives, polyacrylamide-based adhesives, cellulose-based adhesives, and the like.
Among these pressure-sensitive adhesives, those excellent in optical transparency, adhesion characteristics such as appropriate wettability, cohesion and adhesion, weather resistance, heat resistance and the like are preferably used. As the adhesive exhibiting such characteristics, an acrylic adhesive can be preferably used.
The adhesive layers 12 and 22 can be formed, for example, by the following method: a method in which the pressure-sensitive adhesive is applied to a release film (separator) or the like which has been subjected to a peeling treatment, and the pressure-sensitive adhesive layer is formed by drying and removing a polymerization solvent or the like, and then transferred to a polarizer (or a transparent protective film); or a method of applying the adhesive to a polarizer (or a transparent protective film) and drying to remove the polymerization solvent and the like to form an adhesive layer on the polarizer. In the case of applying the adhesive, it is also possible to add one or more solvents other than the polymerization solvent newly.
As the release film subjected to the release treatment, a silicone release liner can be preferably used. In the step of forming the pressure-sensitive adhesive layer by applying the pressure-sensitive adhesive of the present invention on such a liner and drying the pressure-sensitive adhesive, a suitable method may be employed as a method for drying the pressure-sensitive adhesive according to the purpose. A method of drying the coating film by heating is preferably used. The heating and drying temperature is preferably 40 to 200 ℃, more preferably 50 to 180 ℃, and particularly preferably 70 to 170 ℃. By setting the heating temperature in the above range, an adhesive having excellent adhesive properties can be obtained.
The drying time may be suitably and appropriately selected. 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 a method for forming the 1 st adhesive layers 12, 22, various methods can be used. Specifically, examples thereof include: roll coating, roll-to-roll coating, gravure coating, reverse coating, roll-to-roll coating, spray coating, dip roll coating, bar coating, blade coating, air knife coating, curtain coating, lip coating, extrusion coating using a die coater, and the like.
The thickness of the 1 st pressure-sensitive adhesive layers 12 and 22 is not particularly limited, and is, for example, about 1 to 100 μm. Preferably 2 to 50 μm, more preferably 2 to 40 μm, and still more preferably 5 to 35 μm.
< mold release film >
The 1 st release film 11, 21 protects the adhesive layer until it is put to practical use. Examples of the material constituting the release film include: plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabrics, and sheets such as nets, foamed sheets, metal foils, and laminates thereof are preferably used from the viewpoint of 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: polyethylene film, polypropylene film, polybutylene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film, and the like.
The thickness of the 1 st release film 11, 21 is usually about 5 μm to 200. mu.m, preferably about 5 μm to 100. mu.m. The separator may be subjected to release and anti-fouling treatment with a silicone-based, fluorine-based, long-chain alkyl-based or fatty acid amide-based release agent, silica powder or the like, or antistatic treatment of a coating type, a kneading type, a vapor deposition type or the like, as necessary. In particular, by appropriately performing a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment on the surface of the release film, the releasability from the pressure-sensitive adhesive layer can be further improved.
(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 1 st substrate (visible side surface) Pa and a 2 nd substrate (back surface) Pb) disposed to face each other. The liquid crystal cell may use any type of liquid crystal cell, but in order to achieve high contrast, a liquid crystal cell of a Vertical Alignment (VA) mode, an in-plane switching (IPS) mode is preferably used. The liquid crystal display panel is formed by laminating a polarizing film on one surface or both surfaces of a liquid crystal cell, and is incorporated with a driving circuit as necessary.
(organic EL Unit, organic EL display Panel)
The organic EL unit has a structure in which an electroluminescent layer is sandwiched between a pair of electrodes. As the organic EL unit, any type of organic EL unit such as a Top Emission (Top Emission) system, a Bottom Emission (Bottom Emission) system, and a Double Emission (Double Emission) system can be used. The organic EL display panel is formed by laminating a polarizing film on one surface or both surfaces of an organic EL unit, and is provided with a driving circuit as necessary.
(roll-to-roll Panel type 1 st Panel manufacturing part)
Fig. 2 shows a system for manufacturing a roll-to-roll optical display panel using the 1 st optical film 1 in a roll form. In this embodiment, the optical element will be described by taking a liquid crystal cell as an example, and the optical display panel will be described by taking a liquid crystal display panel as an example.
The 1 st optical film 1 in a roll form is laminated with a 1 st release film 11, a 1 st pressure-sensitive adhesive layer 12, a 1 st optical functional film 13, and a 1 st surface protective film 14 in this order. As shown in fig. 1, the 1 st optical film 1 in a roll shape has a width a corresponding to the long side of the liquid crystal panel (substantially shorter than the long side of the liquid crystal cell P).
As shown in fig. 2, the system for manufacturing a liquid crystal display panel according to the present embodiment includes: a 1 st conveying unit 81 for conveying the liquid crystal cell P to the 1 st sticking unit 64, and a 2 nd conveying unit 82 for conveying the liquid crystal cell P to which the optical film is stuck on the 1 st surface P1 of the liquid crystal cell P using the 1 st optical film 1 in a roll form. Each of the conveying sections 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 a direction orthogonal to the conveying direction. The conveyance roller may be provided with a suction plate or the like.
(liquid Crystal cell transfer Process)
The liquid crystal cell P is placed on the 1 st conveying unit 81 from the storage unit 91 that stores the liquid crystal cell P such that the 1 st surface P1 is a top surface, and is conveyed to the 1 st pasting unit 64 by the rotation of the conveying roller R.
(1 st optical film feeding step, 1 st optical film cutting step)
The 1 st optical film 10 in a band form released from the 1 st optical film 1 in a roll form is cut into a predetermined size (corresponding to the length of the short side of the liquid crystal cell P (substantially shorter than the short side)) by the cutting section 61 so as to leave the 1 st release film 11 without cutting while sucking and fixing the 1 st release film 11 side, the 1 st optical functional film 13 in a band form, and the 1 st surface protective film 14 in a band form, thereby forming a cut section s. Examples of the cutting by the cutting unit 61 include cutting with a cutter (cutting with a saw cutter) and cutting with a laser device. Although an example of the cut-off portion s is shown by an arrow in fig. 2, the cut-off portion is enlarged for ease of explanation. The nip roller, not shown, may be disposed upstream or downstream of the cutting section 61 to convey the 1 st optical film 10 in a belt shape. The nip rollers may be disposed on the upstream side and the downstream side of the cutting section 61.
(tension adjusting step)
The 1 st tension adjusting unit 62 is provided to continuously perform the cutting process and the subsequent attaching process of the 1 st optical film 10 in a band shape for a long time without interruption and to adjust the slack of the film. The 1 st tensioning force adjusting portion 62 is configured to have a bouncing device using a hammer, for example. The nip roller, not shown, may be disposed upstream or downstream of the 1 st tension adjusting unit 62 to convey the 1 st optical film 10. The pinch rollers may be disposed upstream and downstream of the 1 st tension adjusting portion 62.
(peeling step)
The 1 st optical film 10 is wound and reversed in the 1 st peeling section 63, and the 1 st optical film 10 is peeled from the 1 st release film 11. The 1 st release film 11 is wound into a roll by the 1 st winding unit 65. The 1 st winding unit 65 includes a roller and a rotation driving unit that winds the 1 st release film 11 into a roll by rotating the roller. The nip roller, not shown, may be disposed upstream or downstream of the peeling section 63 to convey the 1 st optical film 10 or the 1 st release film 11. The nip rollers may be disposed on the upstream side and the downstream side of the peeling section 63.
(1 st attaching step)
The 1 st sticking section 64 sticks the 1 st optical film 10 from which the 1 st release film 11 is peeled to the 1 st surface P1 of the liquid crystal cell P via the 1 st pressure-sensitive adhesive layer 12 while conveying the liquid crystal cell P. The 1 st pasting section 64 is constituted by a pair of 1 st roller 64a and 2 nd roller 64 b. Either one of the rollers may be a driving roller and the other one may be a driven roller, or both of the rollers may be driving rollers. The 1 st optical film 10 and the liquid crystal cell P are fed downstream while being sandwiched between a pair of 1 st and 2 nd rollers 64a and 64b, whereby the 1 st optical film 10 is stuck to the 1 st plane P1 of the liquid crystal cell P. The liquid crystal cell P having the sheet-like 1 st optical film 10 adhered to the 1 st surface P1 of the liquid crystal cell P is conveyed downstream by the 2 nd conveying unit 82.
(section 2 Panel production of sheet-to-sheet Panel System)
Fig. 3 shows a system for manufacturing a sheet-to-sheet optical display panel using the sheet-like 1 st optical film 2. In this embodiment, the optical element will be described by taking a liquid crystal cell as an example, and the optical display panel will be described by taking a liquid crystal display panel as an example.
The 1 st optical film 2 in a sheet form is laminated with a 1 st release film 21, a 1 st pressure-sensitive adhesive layer 22, a 1 st optical functional film 23, a 1 st surface protective film 24, and a 2 nd surface protective film 25 in this order. As shown in fig. 1, the sheet-like 1 st optical film 2 has a length a and a width b and has a width corresponding to the long side of the liquid crystal panel (substantially shorter than the long side of the liquid crystal cell P).
As shown in fig. 3, the system for manufacturing a liquid crystal display panel according to the present embodiment includes: a 3 rd conveying unit 181 for conveying the liquid crystal cell P to the sheet sticking device 164 (corresponding to the 2 nd sticking unit), and a 4 th conveying unit 182 for conveying the liquid crystal cell P to which the optical film is stuck on the 1 st surface P1 of the liquid crystal cell P using the 1 st optical film 2 in a sheet form. Each of the conveying sections 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 a direction orthogonal to the conveying direction. The conveyance roller may be provided with a suction plate or the like.
(liquid Crystal cell transfer Process)
The liquid crystal cell P is placed from the storage section 191 that stores the liquid crystal cell P to the 3 rd conveying section 181 with the 1 st plane P1 as the top plane, and is conveyed to the sheet sticking device 164 by the rotation of the conveying roller R.
From the container 100 containing the 1 st optical film 2 in a sheet form, the 1 st optical film 2 in a sheet form is sucked by the suction portion 164a of the sheet sticking device 164 and supplied to the sticking position. The 1 st release film 21 is peeled from the 1 st optical film 2 in a sheet form by a peeling unit. The suction surface of the suction portion 164a has an arc-shaped cross section. The peeling unit peels the 1 st release film 21 by, for example, adhering an adhesive tape to the 1 st release film 21 surface using an adhesive tape and moving the adhesive tape by a moving mechanism.
The sheet sticking device 164 has a fixing surface 164b, and the fixing surface 164b fixes the liquid crystal cell P by suction on the 1 st surface P1 side. The sheet-like 1 st optical film 2 in which the 1 st release film 21 was peeled off and the 1 st pressure-sensitive adhesive layer 22 was exposed was attached to the 1 st surface P1 of the liquid crystal cell P so that the suction portion 164a was rolled.
(2 nd Process for peeling off surface protective film)
After the sheet-like 1 st optical film 2 was attached, the 2 nd surface protective film 25 was peeled off. The peeling treatment may be performed manually or by a peeling apparatus.
In the above-described panel 1 manufacturing unit, the optical film is attached to one surface (the 1 st surface P1) of the liquid crystal cell in a roll-to-roll manner, but the present invention is not limited thereto. The optical film may be attached to the other surface (the 2 nd surface P2) of the liquid crystal cell in a roll-to-panel manner or a sheet-to-sheet manner.
In the 2 nd panel manufacturing unit, the optical film is attached to one surface (1 st surface P1) of the liquid crystal cell in a sheet-to-panel manner, but the present invention is not limited thereto. The optical film may be attached to the other surface (the 2 nd surface P2) of the liquid crystal cell in a roll-to-panel manner or a sheet-to-sheet manner.
In the 1 st and 2 nd panel manufacturing units, optical inspection can be performed after the optical films are attached to either one or both surfaces. Based on the result of the optical inspection (for example, when it is determined that the liquid crystal display panel is defective), the optical film is removed from the liquid crystal cell (optical element), and the optical element is attached again by the 2 nd panel manufacturing unit (sheet-to-panel method) to remanufacture the liquid crystal display panel (optical display panel).
(modification example)
In the present embodiment, a case where an optical film unit such as a rolled optical film and a sheet-like optical film is used in a continuous manufacturing method of a liquid crystal display panel has been described, but the present invention is not limited thereto, and the present invention may be used in a continuous manufacturing method of an organic EL display panel.
In the embodiment, the optical film is used as a rolled optical film, but the structure of the rolled optical film is not limited thereto. For example, a film (slit-formed optical film) obtained by winding a strip-shaped optical film having a plurality of slit lines formed in the width direction may be used in addition to the release film.
In the embodiment, the strip-shaped optical film is cut (half-cut) at predetermined intervals in the width direction, but from the viewpoint of improving the yield, the strip-shaped optical film may be cut (skip-cut) in the width direction so as to avoid the defective portions of the strip-shaped optical film, or the optical film including the defective portions may be cut at a size smaller than the predetermined intervals (the size of the optical element) (more preferably, at a size as small as possible).
In the embodiments, a rectangular liquid crystal cell and a liquid crystal display panel are exemplified, but the shapes of the liquid crystal cell and the liquid crystal display panel are not particularly limited as long as they have one set of sides facing each other and the other set of sides facing each other.
Description of the reference numerals
1 roll-shaped optical film
11 Release film
12 adhesive layer
13 optical functional film
14 st surface protective film
2 sheet-like optical film
21 Release film
22 adhesive layer
23 optical functional film
24 st surface protective film
25 nd 2 nd surface protective film
Claims (6)
1. A method for manufacturing an optical display panel includes a 1 st panel manufacturing step and a 2 nd panel manufacturing step,
the 1 st panel manufacturing process includes: a first sticking step of forming an optical display panel by using a rolled optical film formed by winding a strip-shaped optical film and sticking the optical film to at least one surface of an optical element,
the 2 nd panel manufacturing process includes: a 2 nd attaching step of attaching a sheet-like optical film to at least one surface of the optical element to form an optical display panel,
in the first attaching step 1, the adhesive is applied to the substrate,
and attaching the optical film to the at least one surface of the optical element with the pressure-sensitive adhesive layer exposed by peeling the release film from the tape-shaped optical film, the tape-shaped optical film being released from the rolled optical film and having a structure in which the release film, the pressure-sensitive adhesive layer, the optical functional film, and the 1 st surface protective film are laminated in this order,
in the above-mentioned 2 nd attaching step,
a step of attaching a sheet-like optical film to the at least one surface of the optical element with a pressure-sensitive adhesive layer exposed by peeling a release film from the sheet-like optical film, the sheet-like optical film having a structure in which the release film, the pressure-sensitive adhesive layer, the optically functional film, the 1 st surface protection film and the 2 nd surface protection film are laminated in this order,
the 2 nd panel manufacturing process includes: a 2 nd surface protective film peeling step of peeling the 2 nd surface protective film from the sheet-like optical film in a state of being attached to the optical element,
the 1 st surface protective film has an adhesive layer or is of a self-adhesive type,
the 2 nd surface protective film has an adhesive layer or is of a self-adhesive type,
the 1 st surface protection film and the 2 nd surface protection film are the same in constitution,
the magnitude relation of the peeling force among all layers in the sheet-shaped optical film is as follows:
the interlayer peeling force between the release film and the pressure-sensitive adhesive layer is defined as A,
The interlayer peeling force between the pressure-sensitive adhesive layer and the optical functional film is B,
The interlayer peeling force between the optical functional film and the 1 st surface protection film is C,
When the interlayer peeling force between the 1 st surface protection film and the 2 nd surface protection film is D,
A<D<C<B，
the optical functional film of the sheet-like optical film is a polarizing film having a thickness of 60 μm or less, and the polarizing film has a polarizer having a thickness of 10 μm or less.
2. The method for manufacturing an optical display panel according to claim 1, wherein the 1 st attaching step includes:
a cutting step of cutting the tape-shaped optical film discharged from the rolled optical film, while leaving the release film in a direction orthogonal to the longitudinal direction of the optical film; and the combination of (a) and (b),
and a peeling step of peeling the release film from the optical film.
3. The method for manufacturing an optical display panel according to claim 1, wherein the tape-shaped optical film is provided with cuts at predetermined intervals other than the release film,
the first attaching step includes: and a peeling step of peeling the optical film released from the rolled optical film by folding back the release film to the inside.
4. A manufacturing system of an optical display panel includes a 1 st panel manufacturing part and a 2 nd panel manufacturing part,
the 1 st panel manufacturing part includes: a 1 st attaching part for attaching a rolled optical film formed by winding a belt-shaped optical film to at least one surface of an optical element to form an optical display panel,
the 2 nd panel manufacturing part includes: a 2 nd attaching part for attaching a sheet-like optical film to at least one surface of the optical element to form an optical display panel,
the 1 st attaching part attaches the optical film to the at least one surface of the optical element with the adhesive layer exposed by peeling the release film from the strip-shaped optical film, which is released from the rolled optical film and has a structure in which the release film, the adhesive layer, the optical functional film, and the 1 st surface protection film are sequentially laminated,
the 2 nd attaching part attaches the sheet-shaped optical film to the at least one surface of the optical element with the pressure-sensitive adhesive layer exposed by peeling the release film from the sheet-shaped optical film, the sheet-shaped optical film having a structure in which the release film, the pressure-sensitive adhesive layer, the optical functional film, the 1 st surface protection film, and the 2 nd surface protection film are laminated in this order,
the 2 nd panel manufacturing part has a 2 nd surface protective film peeling part for peeling the 2 nd surface protective film from the sheet-like optical film in a state of being attached to the optical element,
the 1 st surface protective film has an adhesive layer or is of a self-adhesive type,
the 2 nd surface protective film has an adhesive layer or is of a self-adhesive type,
the 1 st surface protection film and the 2 nd surface protection film are the same in constitution,
the magnitude relation of the peeling force among all layers in the sheet-shaped optical film is as follows:
the interlayer peeling force between the release film and the pressure-sensitive adhesive layer is defined as A,
The interlayer peeling force between the pressure-sensitive adhesive layer and the optical functional film is B,
The interlayer peeling force between the optical functional film and the 1 st surface protection film is C,
When the interlayer peeling force between the 1 st surface protection film and the 2 nd surface protection film is D,
A<D<C<B，
the optical functional film of the sheet-like optical film is a polarizing film having a thickness of 60 μm or less, and the polarizing film has a polarizer having a thickness of 10 μm or less.
5. The system for manufacturing an optical display panel according to claim 4, wherein the 1 st attaching part has:
a cutting section that cuts the tape-shaped optical film discharged from the rolled optical film, leaving the release film in a direction orthogonal to a longitudinal direction of the optical film; and the combination of (a) and (b),
a peeling section that peels the release film from the optical film.
6. The system for manufacturing an optical display panel according to claim 4, wherein the optical film in a tape form is provided with cuts at predetermined intervals other than the release film,
the 1 st sticking portion has a peeling portion which peels off the optical film released from the rolled optical film by folding back the release film to the inside.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016144846A JP6732580B2 (en) | 2016-07-22 | 2016-07-22 | Optical display panel manufacturing method and optical display panel manufacturing system |
| JP2016-144846 | 2016-07-22 | ||
| PCT/JP2017/023956 WO2018016289A1 (en) | 2016-07-22 | 2017-06-29 | Optical display panel production method and optical display panel production system |
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| CN109478383A CN109478383A (en) | 2019-03-15 |
| CN109478383B true CN109478383B (en) | 2021-07-27 |
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| JP (1) | JP6732580B2 (en) |
| KR (1) | KR102425954B1 (en) |
| CN (1) | CN109478383B (en) |
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| TWI775071B (en) * | 2020-05-05 | 2022-08-21 | 威光自動化科技股份有限公司 | Automatic peeling method and device for lower release film of adhesive tape with upper and lower release films |
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| CN101281258A (en) * | 2007-04-03 | 2008-10-08 | 日东电工株式会社 | Optical film products and method for producing optical film products |
| JP2010204622A (en) * | 2009-02-03 | 2010-09-16 | Jiroo Corporate Plan:Kk | Polarizer outside surface protection film, polarizing plate and liquid crystal element |
| TW201142380A (en) * | 2010-02-25 | 2011-12-01 | Sumitomo Chemical Co | Manufacturing method of polarizing plate |
| CN103069317A (en) * | 2010-08-27 | 2013-04-24 | 日东电工株式会社 | Continuous roll of optical function film, method of manufacture of liquid crystal display element employing same, and optical function film laminating device |
| CN102385090A (en) * | 2010-09-03 | 2012-03-21 | 日东电工株式会社 | Roll of continuous web of optical film laminate and production method therefor |
| CN102466911A (en) * | 2010-11-12 | 2012-05-23 | 日东电工株式会社 | Liquid crystal display device manufacturing method |
| CN104737065A (en) * | 2012-11-09 | 2015-06-24 | 日东电工株式会社 | Continuous manufacturing method of optical display panels and continuous manufacturing system of optical display panels |
| WO2016072359A1 (en) * | 2014-11-05 | 2016-05-12 | 住友化学株式会社 | Method for manufacturing polarization plate sheet |
| CN105717572A (en) * | 2014-12-22 | 2016-06-29 | 住友化学株式会社 | Polarizing plate with protective film and laminate comprising the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018013728A (en) | 2018-01-25 |
| TWI729163B (en) | 2021-06-01 |
| TW201805146A (en) | 2018-02-16 |
| KR102425954B1 (en) | 2022-07-28 |
| KR20190026033A (en) | 2019-03-12 |
| CN109478383A (en) | 2019-03-15 |
| WO2018016289A1 (en) | 2018-01-25 |
| JP6732580B2 (en) | 2020-07-29 |
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