CN107924020B - Optical film assembly and method of making the same - Google Patents

Optical film assembly and method of making the same Download PDF

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Publication number
CN107924020B
CN107924020B CN201780002968.XA CN201780002968A CN107924020B CN 107924020 B CN107924020 B CN 107924020B CN 201780002968 A CN201780002968 A CN 201780002968A CN 107924020 B CN107924020 B CN 107924020B
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China
Prior art keywords
film
optical
adhesive layer
optical film
surface protective
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CN107924020A (en
Inventor
池嶋健太郎
三田聪司
上野友德
宫井惠美
徐菁璠
岸敦史
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Nitto Denko Corp
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Nitto Denko Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

An object of the present invention is to provide an optical film module capable of manufacturing an optical display panel having the same structure in a favorable manner 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, and a manufacturing method thereof. The invention is an optical film assembly having a rolled optical film and a sheet-like optical film, wherein the rolled optical film (1) is a structure in which a release film (11), a pressure-sensitive adhesive layer (12), an optical functional film (13) and a1 st surface protection film (14) are sequentially laminated, and the sheet-like optical film (2) is a structure in which the release film (21), the pressure-sensitive adhesive layer (22), the optical functional film (23), the 1 st surface protection film (24) and a 2 nd surface protection film (25) are sequentially laminated.

Description

Optical film assembly and method of making the same
Technical Field
The present invention relates to an optical film module including a rolled optical film and a sheet-like optical film, and a method for manufacturing the same.
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 formed in a roll shape. The method comprises the following steps: the optical film drawn out of the roll-shaped optical film is cut (half-cut) in the width direction with the release film left, the release film is peeled from the optical film obtained by cutting, and the optical film is bonded to an optical element via the exposed adhesive layer (hereinafter also referred to as a "roll to panel" method) (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: an optical film in a sheet state prepared in advance is bonded to an optical element (hereinafter also referred to as a "sheet to panel (panel) system") via an adhesive layer exposed by peeling off a release film (see, for example, 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
However, in the manufacture of optical display panels represented by liquid crystal display panels, there are newly produced examples in which optical display panels having the same structure are manufactured not only by a roll-to-roll panel method but also by a 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. When defective products are not so large, it is considered to use a sheet-to-panel system when a new optical functional film is bonded to an optical element in the above-described rework process. In addition, for example, when a large number of optical display panels having the same structure must be produced in a short time, the roll-to-roll panel system cannot provide the entire supply amount, and in this case, it is also considered to use the sheet-to-panel system in combination.
In recent years, with the progress of thinning of optical display panels, optical functional films (for example, polarizing films having a thickness of 60 μm or less) thinner than conventional ones, such as polarizing films, have been developed. Such a thin optical functional film has low rigidity (elastic modulus) and is likely to be twisted or curled.
In the roll-to-roll panel system, a thin optical functional film is fed to a bonding position in a state of being laminated on a carrier film (release film), and the optical functional film is peeled from the carrier film (release film) at the bonding position to bond the optical functional film to an optical element. However, in the sheet-to-panel system, handling such as conveyance of the optical functional film in a sheet form, peeling of the release film, and bonding of the optical functional film to the liquid crystal cell is difficult, and there is a concern that defective bonding may occur and yield may decrease.
An object of the present invention is to provide an optical film module capable of manufacturing an optical display panel having the same structure in a favorable manner 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, and a manufacturing method thereof.
Means for solving the problems
The invention relates to an optical film assembly having a rolled optical film and a sheet-like optical film,
the rolled optical film is a structure in which a release film, an adhesive layer, an optical functional film and a No. 1 surface protective film are laminated in this order,
the sheet-like optical film is formed by laminating the release film, the pressure-sensitive adhesive layer, the optically functional film, the 1 st surface-protecting film and the 2 nd surface-protecting film in this order.
In the above invention, the 2 nd surface protection film may be the same surface protection film as the 1 st surface protection film, or may be a surface protection film different from the 1 st surface protection film.
The above invention may have the following structure: the interlayer peeling force between the 1 st surface protection film and the optical functional film is larger than that between the 2 nd surface protection film and the 1 st surface protection film.
According to the relationship of the peeling force, the 2 nd surface protection film can be peeled off more smoothly.
In the above invention, the optical functional film may be a polarizing film.
In the above invention, the thickness of the polarizing film may be 60 μm or less.
In the above invention, the polarizing film may have a structure including a polarizer having a thickness of 10 μm or less.
In the above invention, the 1 st surface protection film may have a1 st base film and a1 st pressure-sensitive adhesive layer, and may be laminated on the optical functional film via the 1 st pressure-sensitive adhesive layer.
In the above invention, the 1 st surface protective film may be a self-adhesive film.
In the above invention, the 2 nd surface protection film may have a 2 nd base film and a 2 nd pressure-sensitive adhesive layer, and may be laminated on the 1 st surface protection film via the 2 nd pressure-sensitive adhesive layer.
In the above invention, the 2 nd surface protective film may be a self-adhesive film.
The above invention may have the following structure: the rolled optical film has a width corresponding to a pair of sides facing each other of the optical elements, the sheet-like optical film has a pair of sides facing each other of the optical elements and a length corresponding to a pair of sides facing each other of the optical elements, and the sheet-like optical film has a length corresponding to a pair of sides facing each other of the optical elements.
In the above invention, the rolled optical film and the sheet-like optical film may be used for manufacturing an optical display panel having a structure in which the pressure-sensitive adhesive layer, the optical functional film, and the 1 st surface protective film are laminated in this order on one surface of the optical element.
In the above invention, the rolled optical film may be used for manufacturing the optical display panel in a roll-to-roll panel manner, and the sheet-like optical film may be used for manufacturing the optical display panel in a sheet-to-panel manner.
In the above invention, the sheet-like optical film can be used for remanufacturing the optical display panel having a structure in which the pressure-sensitive adhesive layer, the optical functional film and the 1 st surface protective film are laminated in this order on one surface of the optical element of the optical display panel (the optical display panel which is determined to be defective in the optical display panel manufactured by the roll-to-roll panel method using the rolled optical film and from which the pressure-sensitive adhesive layer, the optical functional film and the 1 st surface protective film are peeled).
The "roll-to-roll panel system" is a system in which a release film is peeled from an optical film drawn out from a rolled optical film, and the optical film is attached to an optical element via an exposed pressure-sensitive adhesive layer. Here, before the release film is peeled off, slits may be formed at a predetermined interval on the optical film so as to leave the release film in the width direction of the optical film. The optical film may be slit in the width direction before being drawn out from the roll, or may be slit in the width direction before being peeled off from the release film after being drawn out.
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 via an exposed adhesive layer.
Another invention is a method for manufacturing the optical film assembly,
the method for manufacturing the rolled optical film comprises the following steps:
a step of preparing an optical film blank (Japanese: original reverse) having a structure in which the release film, the pressure-sensitive adhesive layer, the optically functional film and the 1 st surface protective film are laminated in this order,
a step of producing the rolled optical film by slit-processing the optical film blank and winding the optical film blank,
the method for producing the sheet-like optical film includes the steps of:
a step of bonding a 2 nd surface protection film blank to the 1 st surface protection film side of the optical film blank to produce an optical film blank in which a 2 nd surface protection film is laminated,
and (3) cutting the optical film blank laminated with the 2 nd surface protection film to manufacture a sheet-like optical film.
In the above invention, the "cutting process" is not limited as long as the optical film is processed by cutting the optical film blank into a sheet shape, and includes a process including cutting into a sheet shape, processing an end face after cutting into a sheet shape, and cutting in a width direction after slit-processing the optical film blank into a predetermined width (wherein the end face is not processed).
Another invention is a double-sided optical film package having a1 st optical film package and a 2 nd optical film package,
the 1 st optical film assembly comprises a1 st optical film in a roll shape and a1 st optical film in a sheet shape,
the 1 st optical film in the roll form has a structure in which a1 st release film, a1 st adhesive layer, a1 st optical functional film and a1 st surface protective film are laminated in this order,
the sheet-like 1 st optical film has a structure in which the 1 st release film, the 1 st pressure-sensitive adhesive layer, the 1 st optically functional film, the 1 st surface protective film and the 2 nd surface protective film are laminated in this order,
the 2 nd optical film assembly comprises a 2 nd optical film in a roll shape and a 2 nd optical film in a sheet shape,
the 2 nd optical film in the roll form has a structure in which a 2 nd release film, a 2 nd adhesive layer, a 2 nd optical functional film and a 3 rd surface protective film are laminated in this order,
the 2 nd optical film in a sheet form has a structure in which the 2 nd release film, the 2 nd pressure-sensitive adhesive layer, the 2 nd optical functional film, the 3 rd surface protection film and the 4 th surface protection film are laminated in this order.
In the above invention, the 1 st optical film in roll form and the 1 st optical film in sheet form, and the 2 nd optical film in roll form and the 2 nd optical film in sheet form can be used for manufacturing an optical display panel having a structure in which the 1 st pressure-sensitive adhesive layer, the 1 st optical functional film and the 1 st surface protection film are laminated in this order on one surface of the optical element, and the 2 nd pressure-sensitive adhesive layer, the 2 nd optical functional film and the 3 rd surface protection film are laminated in this order on the other surface of the optical element.
In the above invention, the 1 st optical functional film and the 2 nd optical functional film may have the same optical function or different optical functions.
A method for manufacturing the double-sided optical film assembly, wherein,
the method for manufacturing the 1 st optical film in a roll form may include the steps of:
preparing a1 st optical film blank having a structure in which the 1 st release film, the 1 st pressure-sensitive adhesive layer, the 1 st optical functional film and the 1 st surface protective film are sequentially laminated,
a step of producing the 1 st optical film in a roll form by slit-processing the 1 st optical film blank and winding the same,
the method for producing the sheet-like 1 st optical film may include the steps of:
a step of producing a 2 nd optical film blank in which a 2 nd surface protection film is laminated by bonding a 2 nd surface protection film blank to the 1 st surface protection film side of the 1 st optical film blank,
a step of cutting the 2 nd optical film blank laminated with the 2 nd surface protective film to produce a1 st optical film in a sheet form,
the method for manufacturing the 2 nd optical film in a roll form may include the steps of:
preparing a 2 nd optical film blank having a structure in which the 2 nd release film, the 2 nd pressure-sensitive adhesive layer, the 2 nd optical functional film and the 3 rd surface protective film are laminated in this order,
a step of producing the 2 nd optical film in a roll form by slit-processing the 2 nd optical film blank and winding the same,
the method for producing the sheet-like 2 nd optical film may include the steps of:
a step of producing a 4 th optical film blank in which a 4 th surface protection film is laminated by bonding a 4 th surface protection film blank to the 3 rd surface protection film side of the 2 nd optical film blank,
and a step of cutting the 4 th optical film blank laminated with the 4 th surface protective film to produce a 2 nd optical film in a sheet form.
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 of the optical functional film, the absorption axis direction of the polarizing film in the rolled or sheet-like optical film (the 1 st optical film, the 2 nd optical film) and the optical film blank (the 1 st optical film blank, the 2 nd optical film blank) is not particularly limited as long as it does not hinder achievement of the object of the present invention. That is, even if the roll-to-roll panel system and the sheet-to-panel system are used in combination, as long as the optical display panel having the same structure can be manufactured, in the rolled optical film (1 st optical film, 2 nd optical film) and optical film blank (1 st optical film blank, 2 nd optical film blank), the absorption axis direction of the polarizing film may be parallel to the longitudinal direction, may be orthogonal to the longitudinal direction, or may be oblique to the longitudinal direction (for example, a direction at an angle of 45 ° 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 to the longitudinal direction (for example, a direction at an angle of 45 ° 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 to any one side (for example, a direction at an angle of 45 ° to the side).
In the present invention, in the rolled optical film, in addition to the release film, the pressure-sensitive adhesive layer, the optical functional film and the surface protective film may be slit in a direction (width direction) orthogonal to the longitudinal direction of the optical film at an interval corresponding to the other set of sides facing the optical element. With this structure, in the roll-to-roll panel system, it is not necessary to cut (half-cut) the optical film.
In the above invention, the optical element may be a VA-type or IPS-type liquid crystal cell or an organic EL cell.
The shape of the optical element is not particularly limited as long as it has one set of sides facing each other and the other set of sides facing each other, and it may be square or rectangular. In general, one set of opposing sides of the optical element is orthogonal to the other set of opposing sides.
ADVANTAGEOUS EFFECTS OF INVENTION
The optical film assembly of the present invention is used to manufacture optical display panels of the same structure. The rolled optical film is used in a roll-to-roll panel manner. The sheet-like optical film is used in a sheet-to-panel manner. The sheet-like optical film has the same laminated structure as the rolled optical film except that the 2 nd surface protective film is provided. The rolled optical film is used for manufacturing an optical display panel having a structure in which a pressure-sensitive adhesive layer, an optical functional film, and a1 st surface protective film are sequentially laminated on one surface of an optical element by using a roll-to-roll panel method. Further, since the sheet-like optical film provided with the 2 nd surface protective film is improved in handling properties, occurrence of twist, curl, or the like can be suppressed, and the sheet-to-panel system can be suitably bonded to the optical element. Further, by removing (e.g., peeling) the 2 nd surface protective film from the sheet-like optical film laminated to the optical display panel, an optical display panel having the same laminated structure as that of an optical display panel manufactured in a roll-to-roll panel manner can be manufactured as a result. That is, according to the optical film module (optical film set) of the present invention, when the optical film is bonded to the optical element, even in the case of using the roll-to-panel method and the sheet-to-panel method in combination, the optical display panel having the same structure can be manufactured satisfactorily.
Drawings
FIG. 1 is a schematic view showing an optical film module according to embodiment 1
FIG. 2 is a schematic view showing a double-sided optical film module according to embodiment 2
FIG. 3A is a schematic view showing a method for manufacturing a1 st optical film in a roll form
FIG. 3B is a schematic view showing a method of manufacturing a1 st optical film in a sheet form
FIG. 4 is a schematic view of a continuous production system for optical display panels according to embodiment 4
FIG. 5 is a diagram showing a remanufacturing process
FIG. 6 is a schematic view showing a system for continuously manufacturing an optical display panel according to embodiment 5
Detailed Description
(embodiment mode 1: optical film Module)
FIG. 1 is a schematic diagram illustrating an optical pellicle assembly. The upper part of fig. 1 shows an enlarged view of the side, plane and a part of the cross section of the 1 st optical film 1 in a roll form. The lower portion of fig. 1 shows an enlarged view of the side, plane and a portion of the cross-section of the 1 st optical film 2 in the form of a sheet. The 1 st optical film 1 in a roll form is laminated with a1 st release film 11, a1 st pressure-sensitive adhesive layer 12, a1 st optical functional film 13, and a1 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 a width a, which is drawn out from the 1 st optical film 1 in a roll shape, is cut at a predetermined interval b by the cutting means C so as to leave the release film 11. Symbol s is a notch formed in the 1 st optical film 10 by the above-described cutting.
Further, the 1 st optical film 2 in a sheet form is laminated with a1 st release film 21, a1 st pressure-sensitive adhesive layer 22, a1 st optical functional film 23, a1 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 structure. 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 have the same 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 this embodiment, the 1 st surface protection film 14 (or 24) has a1 st base film and a1 st adhesive layer, and is laminated on the 1 st optical functional film 13 (or 23) via the 1 st adhesive layer. As another embodiment, 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 via the 2 nd adhesive layer. In another embodiment, the 2 nd surface protective film 25 may be a self-adhesive film.
(relationship between interlayer peeling force)
In the present invention, 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,
is 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 preferably 60 μm or less, more preferably 55 μm or less, and still more preferably 50 μm or less is used from the viewpoint of reduction in thickness. 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 "dual-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)
The polarizer may be made of a polyvinyl alcohol resin. 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 acetalized 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, and the like, in 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 dyeing a polyvinyl alcohol film by immersing the film in an aqueous iodine solution 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 unevenness and little 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 polarizer is preferably configured such that optical characteristics represented by the monomer transmittance T and the polarization degree P satisfy the following conditions.
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)
A polarizer configured to satisfy the above conditions is required to have a performance required for 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 other applications, for example, the adhesive sheet can be attached to the recognition side of the organic EL unit.
As the thin polarizer, from the viewpoint that it can be stretched to a high magnification and the polarizing performance can be improved in a production method including a step of stretching in a state of a laminate and a step of dyeing, it is preferable to use a polarizer obtained by a production method including a 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 a step of auxiliarily stretching in air 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. With this production method, even if the PVA-based resin layer is thin, it can be stretched without causing troubles such as breakage due to stretching by being supported by the stretching resin base material.
(protective film (polarizer protective film))
As a material constituting the protective film, a material excellent in transparency, mechanical strength, thermal stability, moisture resistance, 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 polymers such as ethylene-propylene copolymers, vinyl chloride-based polymers, polyamide-based polymers such as nylon and aromatic polyamide, imide-based polymers, sulfone-based polymers, polyether ether ketone-based polymers, polyphenylene sulfide-based polymers, vinyl alcohol-based polymers, vinylidene chloride-based polymers, vinyl butyral-based polymers, aryl ester-based polymers, polyoxymethylene-based polymers, epoxy-based polymers, or mixtures of the above 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 50% by weight or less, 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 from the transparent protective film.
(sandwiching layer)
The protective film is laminated with a polarizer with an adhesive layer, an undercoat layer (primer layer), and other intervening layers interposed therebetween. In this case, it is preferable to laminate the two layers without an air gap by interposing a layer therebetween.
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 as the adhesive, various types of adhesives such as aqueous, solvent, hot melt, and active energy ray-curable adhesives can be used, and an aqueous adhesive or an active energy ray-curable adhesive is preferable.
Examples of the water-based 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 formed from 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 in the form of an ultraviolet ray-curable 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 can be added to the formation of the easy-bonding 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 pressure-sensitive adhesives, acrylic pressure-sensitive adhesives are preferably used from the viewpoint of excellent optical transparency, excellent adhesive properties such as favorable wettability, aggregation and adhesiveness, and excellent weather resistance and heat resistance.
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 an adhesive layer is not laminated) of a polarizing film in an optical film, and are used for protecting an optical functional film such as a polarizing film.
The base film of the 1 st or 2 nd surface protection film is 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 substrate film may be used in the form of a laminate of 1 or 2 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 μm or less, and more preferably 20 to 100 μm.
The 1 st and 2 nd surface protective films may be used in the form of a self-adhesive film, and a film having the base film and an adhesive layer may also be used. 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 of the adhesive layer (dry film thickness) is determined according to the desired adhesive force. 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 surface opposite to the surface on which the pressure-sensitive adhesive layer is provided, using a low-adhesion material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment.
< adhesive layer >
The 1 st adhesive layers 12 and 22 may be formed using a suitable adhesive, and the kind 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, aggregability and adhesiveness, weather resistance, heat resistance and the like can be preferably used. As the adhesive exhibiting such characteristics, an acrylic adhesive is preferably used.
The method for forming the 1 st adhesive layer 12, 22 can be produced, for example, by the following method: a method in which the pressure-sensitive adhesive is applied to a release film (e.g., a separator) subjected to a peeling treatment, and then dried to remove a polymerization solvent and the like to form a pressure-sensitive adhesive layer, followed by transfer 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, one or more solvents other than the polymerization solvent may be added newly as appropriate.
As the release film subjected to the release treatment, a silicone release liner is 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 applied pressure-sensitive adhesive, a suitable method can be appropriately 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 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 a method for forming the 1 st adhesive layers 12, 22, various methods can be used. Specifically, examples thereof include: roll coating, lick coating, gravure coating, reverse coating, roll brush 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 μm 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 is used to protect the adhesive layer until it is put into 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 with a coating type, a kneading type, a vapor deposition type or the like, as necessary. In particular, by appropriately subjecting the surface of the release film to a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment, the releasability from the pressure-sensitive adhesive layer can be further improved.
(embodiment mode 2: double-sided optical film Module)
The double-sided optical film package of embodiment 2 is composed of the 1 st optical film package and the 2 nd optical film package. The 1 st optical film unit is the same as the 1 st optical film unit of embodiment 1, and therefore, description thereof is omitted. The 2 nd optical film package is described with reference to FIG. 2. The 2 nd optical film assembly has a 2 nd optical film 3 in a roll form and a 2 nd optical film 4 in a sheet form.
The upper part of fig. 2 shows an enlarged view of the side, plane and a part of the cross section of the 2 nd optical film 3 in a roll form. The lower part of fig. 2 shows an enlarged view of the side, plane and a part of the cross section of the 2 nd optical film 4 in the form of a sheet. The 2 nd optical film 3 in a roll form is laminated with a 2 nd release film 31, a 2 nd pressure-sensitive adhesive layer 32, a 2 nd optical functional film 33, and a 3 rd surface protective film 34 in this order. The strip-shaped optical film 30 having the width b and drawn out of the 2 nd optical film 3 in a roll shape is cut by the cutting means C at a predetermined interval a so as to leave the 2 nd release film 31. The symbol s denotes a slit formed by the above-described cutting in the optical film 30.
Further, the 2 nd optical film 4 in a sheet form is laminated with a 2 nd release film 41, a 2 nd pressure-sensitive adhesive layer 42, a 2 nd optical functional film 43, a 3 rd surface protecting film 44 and a 4 th surface protecting film 45 in this order. The size of the 2 nd optical film 4 in a sheet form is a length a and a width b.
In the present embodiment, the 2 nd release film 31 and the 2 nd release film 41 have the same structure. The 2 nd adhesive layer 32 and the 2 nd adhesive layer 42 are of the same construction. The 2 nd optical functional film 33 and the 2 nd optical functional film 43 have the same structure. The 3 rd surface protecting film 34, the 3 rd surface protecting film 44 and the 4 th surface protecting film 45 have the same 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 this embodiment, the 3 rd surface protection film 34 (or 44) has a 3 rd base film and a 3 rd adhesive layer, and is laminated on the 2 nd optical functional film 33 (or 43) via the 3 rd adhesive layer. As another embodiment, the 3 rd surface protective film 34 (or 44) may be a self-adhesive film.
In the present embodiment, the 4 th surface protection film 45 includes a 4 th base film and a 4 th adhesive layer, and is laminated on the 3 rd surface protection film 34 via the 4 th adhesive layer. In another embodiment, the 4 th surface protective film 45 may be a self-adhesive film.
(relationship between interlayer peeling force)
Further, the interlayer peeling force between the 3 rd surface protective film 34 and the 2 nd optical functional film 33 is larger than that between the 4 th surface protective film 45 and the 3 rd surface protective film 44. This enables the 4 th surface protection film 45 to be more smoothly peeled off.
The magnitude of the peeling force between the layers in the 2 nd optical film 4 in a sheet form is as follows.
The 2 nd release film 41 and the 2 nd pressure-sensitive adhesive layer 42 had an interlayer peeling force of A1,
The 2 nd pressure-sensitive adhesive layer 42 and the 2 nd optical functional film 43 had an interlayer peeling force of B1,
The 2 nd optical functional film 43 and the 3 rd surface protective film 44 have an interlayer peeling force of C1,
When the interlayer peeling force between the 3 rd surface protective film 44 and the 4 th surface protective film 45 is D1,
A1＜B1、A1＜C1、A＜D1。
preferably A1 < D1 < C1 ≦ B1 or A1 < D1 < B1 ≦ C1.
More preferably A1 < D1 < C1 < B1.
By utilizing the relationship between the interlayer peeling forces, the peeling of the 4 th surface protective film can be suppressed when the 2 nd release film is peeled.
Each member constituting the 2 nd optical film in roll form and the 2 nd optical film in sheet form in the 2 nd optical film module may have the same configuration as the optical functional film, release film, adhesive layer, and surface protective film described in embodiment 1.
(embodiment 3: production of optical film Module)
Next, a method for manufacturing the 1 st optical film unit and the 2 nd optical film unit will be described. Fig. 3A is a schematic diagram illustrating a method of manufacturing the 1 st optical film 1 in a roll form. Fig. 3B is a schematic diagram illustrating a method of manufacturing the 1 st optical film 2 in a sheet form.
In FIG. 3A, a1 st optical film 5 blank in roll form having a structure in which a1 st release film, a1 st pressure-sensitive adhesive layer, a1 st optical functional film and a1 st surface protective film are laminated in this order is prepared. Next, the 1 st optical film 5 is drawn from the 1 st optical film blank, and slit-processed into 3-stripe optical films with a predetermined width "a" by a slit cutter sc. The slit-processed 3-strip optical films were wound up to produce a1 st optical film in a roll form.
In the present embodiment, the slit is processed into the 3-stripe optical film, but is not limited thereto. In the present embodiment, both end portions e1 and e2 are trimmed (end trimming), but either end portion may be cut off, or both end portions may not be trimmed.
In fig. 3B, the 2 nd surface protection film 25 drawn out from the 2 nd surface protection film blank S25 is bonded to the 1 st surface protection film 14 side of the 1 st optical film 1 (corresponding to the 1 st optical film blank) in a roll form by bonding means (a pair of bonding rollers R1, R2) to produce an optical film blank S2 in which the 2 nd surface protection film 25 is laminated. Next, the optical film blank S2 on which the 2 nd surface protection film 25 is laminated is subjected to full-cut processing at a predetermined interval b by using a cutting means FC to produce the 1 st optical film 2 in a sheet form. The sheet-like 1 st optical film 2 may be stored in a predetermined storage section, or may be laminated on a carrier film. The 1 st optical film package can be manufactured using the above method.
As other embodiments, may include: a step of winding the optical film blank S2, and a step of drawing the 1 st optical film in a tape form from the optical film blank S2 and cutting the film at a predetermined interval b by using a cutting means FC.
The 2 nd optical film module can also be manufactured by the same steps as those of fig. 3A and 3B.
In another embodiment, the method may further include: after the slit processing, the adhesive layer 12, the 1 st optical functional film, and the 1 st surface protective film are cut (half-cut) at predetermined intervals so as to leave the 1 st release film 11 in a strip shape, thereby forming a plurality of slits.
(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 (viewing side surface) Pa and a 2 nd substrate (back surface) Pb) disposed opposite to 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) type, an in-plane switching (IPS) type is preferably used. The liquid crystal display panel is a liquid crystal display panel in which a polarizing film is bonded to one surface or both surfaces of a liquid crystal cell, and a drive circuit is incorporated 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 a driving circuit is incorporated as necessary.
(embodiment mode 4: remanufacturing Using the optical film Assembly No. 1)
Fig. 4 is a schematic diagram of a continuous manufacturing system for optical display panels. In the present embodiment, the 1 st optical film 1 in a roll form is used for manufacturing an optical display panel in a roll-to-roll panel manner. The sheet-shaped 1 st optical film 2 is used for remanufacturing an optical display panel having a structure in which the 1 st adhesive layer, the 1 st optical functional film and the 1 st surface protective film are laminated in this order on one surface of an optical element of the optical display panel (an optical display panel in which the 1 st adhesive layer, the 1 st optical functional film and the 1 st surface protective film are peeled off from the optical display panel which is determined to be defective in the optical display panel manufactured using the 1 st optical film 1 in a roll form). Specifically, on one surface of the optical element from which the 1 st pressure-sensitive adhesive layer 22, the 1 st optical functional film 23, and the 1 st surface protection film 24 were peeled off, the 1 st release film 21 was peeled off from the 1 st optical film 2 in a sheet-to-sheet manner, and after the 1 st pressure-sensitive adhesive layer 22, the 1 st optical functional film 23, the 1 st surface protection film 24, and the 2 nd surface protection film 25 were sequentially laminated, the 2 nd surface protection film 25 was peeled off. In this embodiment, a liquid crystal cell is taken as an example of an optical element, and a liquid crystal display panel is taken as an example of an optical display panel.
The 1 st optical film 1 in a roll form is laminated with a1 st release film 11, a1 st pressure-sensitive adhesive layer 12, a1 st optical functional film 13, and a1 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 (a width substantially shorter than the long side of the liquid crystal cell P).
As shown in fig. 4, the system for manufacturing a liquid crystal display panel according to the present embodiment includes: a1 st transport unit 81 for transporting the liquid crystal cell P to the 1 st bonding unit 64, and a 2 nd transport unit 82 for transporting the liquid crystal cell P having the optical film bonded to 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 section 81 from the storage section 91 that stores the liquid crystal cell P such that the 1 st plane P1 is a top plane, and is conveyed to the 1 st pasting section 64 by the rotation of the conveying roller R.
(1 st optical film drawing step, 1 st optical film cutting step)
While the 1 st optical film 10 in a strip form taken out of the 1 st optical film 1 in a roll form is sucked and fixed, the 1 st release film 11 is left uncut by the cutting section 61, and the adhesive layer 12 in a strip form, the 1 st optical functional film 13 in a strip form, and the 1 st surface protective film 14 in a strip form are 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)) to form a cut section s. Examples of the cutting by the cutting section 61 include cutting using a cutter (cutting by a cutting cutter) and cutting by a laser device. Although an example of the cut-out portion s after cutting is shown by an arrow in fig. 4, the cut-out portion is particularly enlarged for ease of explanation. The nip roller, not shown, may be configured to convey the 1 st optical film 10 in a belt shape, disposed on the upstream side or the downstream side of the cutting section 61. The nip rollers may be disposed on the upstream side and the downstream side of the cutter 61.
(tension adjusting step)
The 1 st tension adjusting unit 62 is provided to continuously perform the cutting process and the subsequent sticking process of the 1 st optical film 10 in a band form for a long time without interruption and to adjust the slack of the film. The 1 st tension adjusting section 62 is configured to have a tension adjusting device using a weight, 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 nip 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 around the 1 st peeling section 63 and reversed, 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 part 65. The 1 st winding section 65 has a roller and a rotation driving section 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 and may 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.
(the 1 st pasting step)
The 1 st attaching part 64 attaches 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 part 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 surface 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.
(inspection step 1)
The 1 st inspection unit 70 performs optical inspection of the liquid crystal cell P. The 1 st inspection unit 70 includes: a light source 71 disposed on one side of the liquid crystal cell P and configured to transmit light through the liquid crystal cell P; and a1 st image pickup unit 72 disposed on the opposite side of the light source with the liquid crystal cell P therebetween, and picking up a transmitted optical image of the liquid crystal cell P. The 1 st image pickup unit 72 may be an area sensor (area sensor) or a line sensor (line sensor). The 1 st inspection unit 70 may further include a 2 nd imaging unit (not shown) for imaging a reflected optical image for inspecting the bonding position of the 1 st optical film 10. The 1 st image analysis unit 51 analyzes the image captured by the 1 st inspection unit 70. The control section 50 controls operation timing and the like of each configuration of the continuous manufacturing system.
(determination step 1)
The 1 st determination unit 52 determines whether the liquid crystal cell P is a non-defective product or a defective product based on the result of analyzing the image by the 1 st image analysis unit 51. Examples of defective products include a distortion of the adhesive sheet and air bubbles. The liquid crystal cell P determined as a non-defective product is collected in the 1 st non-defective product collecting unit 92. The liquid crystal cell P determined as defective is collected in the 1 st defective collection unit 93.
(1 st step of peeling off defective film)
The process of remanufacturing a defective liquid crystal panel into a non-defective liquid crystal panel will be described with reference to fig. 5. As shown in fig. 5, the 1 st optical film 10 is removed from the liquid crystal cell P determined to be defective by the 1 st determining section 52. The removal process may be performed manually or by a peeling device. Next, a case will be described in which the sheet-like 1 st optical film 2 is attached to the 1 st surface P1 of the liquid crystal cell P by using a die bonding apparatus and remanufactured (also referred to as "remanufacturing").
(1 st reattachment step)
Next, the sheet-like 1 st optical film 2 from which the 1 st release film 21 was peeled off is attached to the 1 st surface P1 of the liquid crystal cell P from which the 1 st optical film 10 was peeled off, which was determined to be defective, in a sheet-to-panel manner (e.g., a sheet attaching device). As the patch device, an existing device may be used. Refer to sheet-like 1 st optical film 2 of fig. 1.
(step 2 of peeling off surface protective film)
After the 1 st re-pasting step, the 2 nd surface protection film 25 is peeled from the 1 st optical film 2 in a sheet form. The peeling treatment may be performed manually or by a peeling apparatus. Through the above steps, a liquid crystal panel having the same laminated structure as a liquid crystal panel manufactured in a roll-to-roll panel manner can be manufactured (remanufactured).
(remanufacturing using the 1 st and 2 nd optical film units)
Remanufacturing using the 2 nd optical film package can be performed in the same manner as the remanufacturing using the 1 st optical film package described above. The 2 nd optical film 3 in a roll form is used for manufacturing an optical display panel in a roll-to-roll panel manner. The 2 nd optical film 4 in a sheet form is used for remanufacturing an optical display panel having a structure in which the 2 nd adhesive layer, the 2 nd optical functional film, and the 3 rd surface protective film are laminated in this order on one surface of an optical element of the optical display panel (an optical display panel in which the 2 nd adhesive layer, the 2 nd optical functional film, and the 3 rd surface protective film are peeled off and which is determined to be defective in the optical display panel manufactured using the 2 nd optical film 3 in a roll form). Specifically, on one surface of the optical element from which the 2 nd pressure-sensitive adhesive layer 31, the 2 nd optical functional film 32, and the 3 rd surface protective film 33 were peeled, the 2 nd release film 41 was peeled from the 2 nd optical film 4 in a sheet form by a sheet-to-sheet method, and the 2 nd pressure-sensitive adhesive layer 42, the 2 nd optical functional film 43, the 3 rd surface protective film 44, and the 4 th surface protective film 45 were sequentially bonded, followed by peeling the 4 th surface protective film 45.
The continuous manufacturing system of the optical display panel is configured by adding a roll-to-roll panel manufacturing apparatus using a 2 nd optical film 3 in a roll shape to the roll-to-roll panel manufacturing apparatus using the 1 st optical film 1 in a roll shape. The roll-to-roll panel manufacturing apparatus using the 2 nd optical film 3 in a roll shape can be configured substantially in the same manner as the roll-to-roll panel manufacturing apparatus using the 1 st optical film 1 in a roll shape. The following describes different manufacturing apparatuses.
The liquid crystal cell P determined as a non-defective product by the 1 st inspection unit 70 is conveyed to the subsequent stage, and an optical element is attached to the 2 nd surface P2 of the liquid crystal cell P using the 2 nd optical film in a roll form. The 2 nd conveying unit 82 is provided with a placement replacing unit (not shown) for reversing the upper and lower surfaces (P1, P2) of the liquid crystal cell P of the non-defective product conveyed by the 2 nd conveying unit 82 and replacing the short side and the long side of the liquid crystal cell P in the conveying direction. The placement replacement section may be suitably formed by a known device. In the present embodiment, the placement replacement unit includes: a rotation part for horizontally rotating by 90 degrees by absorbing the liquid crystal unit P, and a turnover part for reversing the front and back surfaces by absorbing the liquid crystal unit P.
After the process of disposing the replacement part, the liquid crystal cell P is conveyed to the 2 nd pasting part. The first and second peeling units have the same 2 nd cutting unit as the 1 st cutting unit 61, the same 2 nd tensioning unit as the 1 st tensioning unit 62, the same 2 nd peeling unit as the 1 st peeling unit 63, and the same 2 nd winding unit as the 1 st winding unit.
The 2 nd cutting unit cuts the 2 nd optical film 30 into a predetermined size (corresponding to the length of the long side of the liquid crystal cell P (the length substantially shorter than the long side)) while holding the 2 nd optical film 30 in a strip form drawn out from the 2 nd optical film 3 in a state of sucking and fixing the side of the 2 nd release film 31 so that the 2 nd release film 31 remains without being cut. The 2 nd optical film 30 in a band shape is conveyed to the 2 nd peeling part via the 2 nd tensioning part, wound around the 2 nd peeling part and turned over, and the 2 nd optical film 30 is peeled from the 2 nd release film 31. The 2 nd release film 31 is wound into a roll by the 2 nd winding portion.
The 2 nd adhesion portion has the same configuration as the 1 st adhesion portion 64. The 2 nd attaching portion attaches the 2 nd optical film 30, from which the 2 nd release film 31 is peeled, to the 2 nd surface P2 of the liquid crystal cell P via the 2 nd pressure-sensitive adhesive layer 32 while conveying the liquid crystal cell P.
The 2 nd inspection unit has the same configuration as the 1 st inspection unit 70.
The 2 nd inspection unit performs optical inspection of the liquid crystal cell P. The 2 nd inspection unit includes: a light source which is disposed on one surface side of the liquid crystal cell P and transmits light through the liquid crystal cell P; and an imaging unit which is disposed on the opposite side of the light source with the liquid crystal cell P therebetween and images a transmitted optical image of the liquid crystal cell P. The 2 nd inspection unit may further include an imaging unit (not shown) for imaging a reflected optical image for inspecting the bonding position of the 2 nd optical film 30. The 2 nd image analysis unit analyzes the image of the image captured by the 2 nd inspection unit.
The 2 nd determination unit determines whether the liquid crystal cell P is a non-defective product or a defective product based on the result of analyzing the image by the 2 nd image analysis unit. Examples of defective products include a distortion of the adhesive sheet and air bubbles. The liquid crystal cell P determined as defective is collected in the 2 nd defective collection unit. When the non-defective liquid crystal cell is determined to be a non-defective liquid crystal cell by the 2 nd determination unit, the non-defective liquid crystal cell is conveyed to the storage unit of the non-defective liquid crystal cell and stored therein.
The remanufacturing using the sheet-shaped optical film 4 is the same as the remanufacturing using the sheet-shaped optical film 2 described above. That is, the 2 nd optical film 30 is removed from the liquid crystal cell P determined as defective. Next, the 2 nd optical film 4 in a sheet form from which the 2 nd release film 31 is peeled is attached to the 2 nd surface P2 of the liquid crystal cell P after the 2 nd optical film 30 is peeled, which is determined to be defective, by a sheet-to-panel method (e.g., a sheet attaching device). Subsequently, the 4 th surface protection film 45 is peeled off from the 2 nd optical film 4 in a sheet form.
(embodiment 5: production of optical display Panel of optical film Module Using optical film roll and sheet-shaped optical film)
Embodiment 5 is a system for continuously manufacturing an optical display panel using an optical film module. Hereinafter, a system for continuously manufacturing an optical display panel according to embodiment 5 will be specifically described with reference to fig. 6.
In the roll-to-roll panel system similar to embodiment 4 (see fig. 4), the 1 st optical film 10 is adhered to the 1 st surface P1 of the liquid crystal cell P using the 1 st optical film 1 in a roll form. In fig. 4 and 6, the same reference numerals have the same functions. The arrangement replacement part 821 turns the upper and lower surfaces (P1, P2) of the liquid crystal cell P to which the 1 st optical film 10 is attached, and changes the short side and the long side of the liquid crystal cell P in the transport direction (y).
Next, a process of adhering the 2 nd optical film 4 in a sheet form to the 2 nd surface P2 of the liquid crystal cell P will be described below. The 2 nd optical film 4 in a sheet form is sucked from the container 100 containing the 2 nd optical film 4 in a sheet form by the suction portion 164a of the sheet sticking device 164 and supplied to the sticking position. The 2 nd release film 41 is peeled from the 2 nd optical film 4 in a sheet form by peeling means. The suction surface of the suction portion 164a has an arc-shaped cross section. The peeling means may be, for example, an adhesive tape, and the 2 nd release film 41 may be peeled off by attaching the adhesive tape to the 2 nd release film 41 surface and moving the adhesive tape by a moving device.
The chip device 164 has a fixing surface 164b, and the fixing surface 164b fixes the liquid crystal cell P on the 1 st surface P1 side by suction. The rolling suction portion 164a attaches the sheet-like 2 nd optical film 4, in which the 2 nd release film 41 is peeled off and the 2 nd pressure-sensitive adhesive layer 42 is exposed, to the 2 nd surface P2 of the liquid crystal cell P.
(No. 4 surface-protecting-film peeling step)
After the 2 nd optical film 4 in a sheet shape is adhered, the 4 th surface protective film 45 is peeled off. The peeling treatment may be performed manually or by a peeling device.
(other embodiment mode of embodiment mode 5)
In embodiment 5, instead of the 1 st optical film 1 in roll form, the 1 st optical film 2 in sheet form may be used to attach the liquid crystal cell in a sheet-to-panel manner, and instead of the 2 nd optical film 4 in sheet form, the 2 nd optical film 3 in roll form may be used to attach the liquid crystal cell in a roll-to-panel manner.
(modification example)
In embodiments 4 and 5, 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 is 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 embodiments 4 and 5, the optical film described above is used as the 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 cutting lines formed in the width direction, in addition to the release film, may be used.
In embodiments 4 and 5, 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 embodiments 4 and 5, a horizontal 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 (12)

1. An optical film unit having a rolled optical film and a sheet-like optical film,
the rolled optical film is a structure formed by sequentially laminating a demoulding film, an adhesive layer, an optical functional film and a No. 1 surface protection film,
the sheet-like optical film is a structure in which the release film, the 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 1 st surface protection film has an adhesive layer or is of a self-adhesive type,
the 2 nd surface protection film has an adhesive layer or is of a self-adhesive type,
the relationship between the magnitude of the peeling force between the layers in the sheet-like optical film is that A < D < C < B when the interlayer peeling force between the release film and the pressure-sensitive adhesive layer is 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 protective film is C, and the interlayer peeling force between the 1 st surface protective film and the 2 nd surface protective film is D,
the 1 st surface protection film and the 2 nd surface protection film have the same structure,
the optical functional film is a polarizing film, the thickness of the polarizing film is less than 60 mu m,
the polarizing film has a polarizer having a thickness of 10 μm or less,
the thickness of the No. 1 surface protection film is 10-150 μm,
the thickness of the No. 2 surface protection film is 10-150 mu m.
2. The optical film package according to claim 1, wherein the 1 st surface protective film comprises a1 st base film and a1 st adhesive layer, and the 1 st surface protective film is laminated on the optical functional film via the 1 st adhesive layer.
3. An optical film package as recited in claim 1, wherein the 1 st surface protective film is the same material and/or the same thickness as the 2 nd surface protective film.
4. The optical film package according to any one of claims 1 to 3, wherein the 2 nd surface protective film comprises a 2 nd base film and a 2 nd adhesive layer, and the 2 nd surface protective film is laminated on the 1 st surface protective film via the 2 nd adhesive layer.
5. An optical film package as recited in any one of claims 1-3,
the rolled optical film has a width corresponding to a set of opposing edges of the optical element,
the sheet-like optical film has a pair of opposing sides having lengths corresponding to the pair of opposing sides of the optical element, and the other pair of opposing sides having lengths corresponding to the other pair of opposing sides of the optical element.
6. The optical film package according to any one of claims 1 to 3, wherein the rolled optical film and the sheet-like optical film are used for manufacturing an optical display panel having a structure in which the pressure-sensitive adhesive layer, the optical functional film, and the 1 st surface protection film are laminated in this order on one surface of an optical element.
7. An optical film package as recited in claim 5, wherein the rolled optical film is used to manufacture the optical display panel in a roll-to-roll manner,
the sheet-shaped optical film is used for manufacturing the optical display panel in a sheet-to-panel manner.
8. An optical film package as recited in claim 7, wherein the sheet-form optical film is used to remanufacture an optical display panel of the structure: and a pressure-sensitive adhesive layer, an optical functional film, and a1 st surface protective film are laminated in this order on one surface of the optical element of the optical display panel, which is determined to be defective in the optical display panel manufactured by the roll-to-panel method using the rolled optical film, and from which the pressure-sensitive adhesive layer, the optical functional film, and the 1 st surface protective film are peeled.
9. A method for producing an optical film unit according to any one of claims 1 to 3,
the method for manufacturing the rolled optical film comprises the following steps:
a step of preparing an optical film blank 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,
a step of producing the rolled optical film by slit-processing the optical film blank and winding the optical film blank,
the method for manufacturing the sheet-shaped optical film comprises the following steps:
a step of producing an optical film blank in which a 2 nd surface protection film is laminated by bonding a 2 nd surface protection film blank to the 1 st surface protection film side of the optical film blank,
and a step of cutting the optical film blank laminated with the 2 nd surface protection film to produce a sheet-like optical film.
10. A double-sided optical film package is a double-sided optical film package having a1 st optical film package and a 2 nd optical film package,
the 1 st optical film assembly comprises a1 st optical film in a roll shape and a1 st optical film in a sheet shape,
the 1 st optical film in a roll form has a structure in which a1 st release film, a1 st adhesive layer, a1 st optical functional film and a1 st surface protective film are laminated in this order,
the sheet-like 1 st optical film is a structure in which the 1 st release film, the 1 st adhesive layer, the 1 st optical functional film, the 1 st surface protective film and the 2 nd surface protective film are laminated in this order,
the 1 st surface protection film has an adhesive layer or is of a self-adhesive type,
the 2 nd surface protection film has an adhesive layer or is of a self-adhesive type,
the relationship between the magnitude of the peeling force between the layers in the 1 st optical film in the sheet form is A < D < C < B when the peeling force between the release film and the pressure-sensitive adhesive layer is A, the peeling force between the pressure-sensitive adhesive layer and the 1 st optical functional film is B, the peeling force between the 1 st optical functional film and the 1 st surface protective film is C, and the peeling force between the 1 st surface protective film and the 2 nd surface protective film is D,
the 1 st surface protection film and the 2 nd surface protection film have the same structure,
the 1 st optical functional film is a polarizing film, the thickness of the polarizing film is 60 μm or less,
the polarizing film has a polarizer having a thickness of 10 μm or less,
the thickness of the No. 1 surface protection film is 10-150 μm,
the thickness of the No. 2 surface protection film is 10-150 μm,
the 2 nd optical film assembly comprises a 2 nd optical film in a roll shape and a 2 nd optical film in a sheet shape,
the 2 nd optical film in a roll form has a structure in which a 2 nd release film, a 2 nd adhesive layer, a 2 nd optical functional film and a 3 rd surface protective film are laminated in this order,
the 2 nd optical film in a sheet form has a structure in which the 2 nd release film, the 2 nd adhesive layer, the 2 nd optical functional film, the 3 rd surface protective film and the 4 th surface protective film are laminated in this order,
the 3 rd surface protective film has an adhesive layer or is of a self-adhesive type,
the 4 th surface protective film has an adhesive layer or is of a self-adhesive type,
the relationship between the magnitude of the peeling force between the layers in the 2 nd optical film in the sheet form is A < D < C < B when the interlayer peeling force between the release film and the pressure-sensitive adhesive layer is A, the interlayer peeling force between the pressure-sensitive adhesive layer and the 2 nd optical functional film is B, the interlayer peeling force between the 2 nd optical functional film and the 3 rd surface protective film is C, and the interlayer peeling force between the 3 rd surface protective film and the 4 th surface protective film is D,
the No. 3 surface protection film and the No. 4 surface protection film are of the same structure,
the 2 nd optical functional film is a polarizing film, the thickness of the polarizing film is 60 mu m or less,
the polarizing film has a polarizer having a thickness of 10 μm or less,
the thickness of the No. 3 surface protection film is 10-150 μm,
the thickness of the No. 4 surface protection film is 10-150 mu m.
11. The double-sided optical film module according to claim 10, wherein the 1 st optical film and the 1 st optical film in a roll form, and the 2 nd optical film in a roll form are used for manufacturing an optical display panel having a structure in which the 1 st pressure-sensitive adhesive layer, the 1 st optical functional film, and the 1 st surface protection film are sequentially laminated on one surface of an optical element, and the 2 nd pressure-sensitive adhesive layer, the 2 nd optical functional film, and the 3 rd surface protection film are sequentially laminated on the other surface of the optical element.
12. The double-sided optical film package of claim 10, wherein the 1 st surface protective film is the same material and/or the same thickness as the 2 nd surface protective film,
the 3 rd surface protection film and the 4 th surface protection film are made of the same material and/or have the same thickness.
CN201780002968.XA 2016-07-22 2017-06-29 Optical film assembly and method of making the same Active CN107924020B (en)

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