WO2016039296A1 - 偏光板、及び、液晶パネルの製造方法 - Google Patents
偏光板、及び、液晶パネルの製造方法 Download PDFInfo
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- WO2016039296A1 WO2016039296A1 PCT/JP2015/075359 JP2015075359W WO2016039296A1 WO 2016039296 A1 WO2016039296 A1 WO 2016039296A1 JP 2015075359 W JP2015075359 W JP 2015075359W WO 2016039296 A1 WO2016039296 A1 WO 2016039296A1
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- polarizing plate
- polarizer
- liquid crystal
- layer
- crystal panel
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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
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
- C08L67/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- 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
-
- 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
- G02F1/133528—Polarisers
Definitions
- the present invention relates to a polarizing plate and a method for manufacturing a liquid crystal panel.
- a polarizer layer that transmits light polarized in a predetermined direction and a polarizer layer that is provided on both sides of the polarizer layer are protected.
- two polarizer protective layers are known.
- the liquid crystal panel is manufactured by bonding the above-described polarizing plate to a liquid crystal cell.
- the polarizing plate is held by a holding device such as a suction disk, and the polarizing plate is aligned with the liquid crystal cell while moving the holding device. Therefore, in order to accurately align the polarizing plate with the liquid crystal cell, the polarizing plate needs to be aligned with the holding device.
- an L-shaped alignment bar is pressed against the polarizing plate held by the holding device, and the position (or orientation) of the polarizing plate is determined using the inner surface of the alignment bar (the surface in contact with the polarizing plate) as a reference surface. Adjustments are made to the holding device.
- an object of the present invention is to provide a polarizing plate capable of suppressing a decrease in manufacturing efficiency of a liquid crystal panel, and a manufacturing method of a liquid crystal panel, with a single polarizer protective layer protecting the polarizer layer. is there.
- a polarizing plate is a polarizing plate including a polarizer layer that selectively allows light polarized in a predetermined direction to pass therethrough, and the polarizer for protecting the polarizer layer on the polarizer layer.
- a polarizing plate body having a protective layer laminated thereon, a protective film laminated on the polarizer protective layer, and an adhesive layer provided on the opposite side of the polarizer layer from the polarizer protective layer.
- the bending resistance of the laminate composed of the main body and the protective film is 7.6 mN or more.
- the bending resistance of the laminate may be 7.64 mN or more.
- an adhesive layer is provided on the opposite side of the protective film from the polarizer body. Therefore, when manufacturing a liquid crystal panel using the said polarizing plate, a polarizing plate can be bonded to a liquid crystal cell through an adhesion layer, for example, hold
- the bending resistance of the laminate including the protective film is 7.6 mN or more, or 7.64 mN or more, the reference plane for position adjustment in the state of being held by the holding device as exemplified by the polarizing plate. Even if the polarizing plate is pressed against the polarizing plate to adjust the position of the polarizing plate, deformation of the polarizing plate can be suppressed, and the polarizing plate is unlikely to fall from the holding device. Therefore, even if the polarizer protective layer which protects a polarizer layer is one, the fall of the manufacturing efficiency of a liquid crystal panel can be suppressed.
- the bending resistance of the polarizing plate body may be 4.0 mN or less.
- the bending resistance of the polarizing plate body may be 3.92 mN or less.
- the bending resistance of the polarizing plate body is 4.0 mN or less, or 3.92 mN or less
- the bending resistance of the laminate including the protective film is 7.6 mN or more because the polarizing film body has a low bending resistance, or
- the shape of the polarizing plate viewed from the thickness direction is a rectangle
- the long side of the rectangle may be 90 mm to 135 mm
- the short side of the rectangle may be 50 mm to 80 mm.
- the material of the protective film may be polyethylene terephthalate or polypropylene.
- the protective film may have a thickness of 30 ⁇ m to 90 ⁇ m.
- the protective film may be provided on the polarizer protective layer so as to be peelable.
- the protective film when a polarizing plate is bonded to a liquid crystal cell to produce a liquid crystal panel, the protective film can be easily removed after the polarizing plate is bonded to the liquid crystal cell.
- the protective film is peeled off in this way, the polarizing plate main body having only one polarizer protective layer is bonded to the liquid crystal cell. Therefore, in the above configuration, the liquid crystal panel can be thinned.
- a method of manufacturing a liquid crystal panel according to another aspect of the present invention includes a polarizing plate in which a polarizer protective layer for protecting a polarizer layer is stacked on a polarizer layer that selectively transmits light polarized in a predetermined direction.
- a method of manufacturing a liquid crystal panel having a main body bonded to a liquid crystal cell in a state where the protective film side of the polarizing plate according to one aspect of the present invention is held by a holding device, at least a part of the outer peripheral surface of the polarizing plate and The process of adjusting the position of the polarizing plate with respect to the holding device by relatively pressing the reference surface with the reference surface, and the polarizing plate whose position is adjusted with respect to the holding device are bonded to the liquid crystal cell via the adhesive layer.
- the polarizing plate according to one aspect of the present invention is used for manufacturing the liquid crystal panel.
- the polarizing plate there is one polarizer protective layer for protecting the polarizer layer, but the bending resistance of the laminate including the protective film is 7.6 mN or more, or 7.64 mN or more. Therefore, when adjusting the position of the polarizing plate with respect to the holding device, the deformation of the polarizing plate can be suppressed even if the reference surface for position adjustment is relatively pressed against the polarizing plate. Hard to fall from. Therefore, even if the polarizer protective layer which protects a polarizer layer is one, the fall of the manufacturing efficiency of a liquid crystal panel can be suppressed.
- the method may further include a step of removing the protective film from the polarizing plate bonded to the liquid crystal cell.
- a liquid crystal panel with a reduced number of polarizer protective layers can be manufactured while suppressing a decrease in manufacturing efficiency.
- a polarizing plate and a method for manufacturing a liquid crystal panel that have a single polarizer protective layer for protecting the polarizer layer and can suppress a decrease in the manufacturing efficiency of the liquid crystal panel.
- FIG. 1 is a perspective view of a polarizing plate according to an embodiment.
- FIG. 2A is a perspective view of an embodiment of a liquid crystal panel manufactured using the polarizing plate shown in FIG.
- FIG. 2B is a side view of the liquid crystal panel shown in FIG.
- FIG. 3A is a side view showing a state in which the polarizing plate is held by a suction disk (holding device).
- FIG. 3B is a plan view of a state where the polarizing plate is held by a suction disk (holding device).
- FIG. 4 is a drawing showing a state where the release film is peeled off from the state shown in FIG. FIG.
- FIG. 5 is a diagram for explaining a step of adjusting the position of the polarizing plate with respect to the holding device (position adjustment step) in the method for manufacturing a liquid crystal panel.
- FIG. 6 is a drawing for explaining a step of attaching a polarizing plate to a liquid crystal cell in the method for manufacturing a liquid crystal panel.
- FIG. 7 is a drawing for explaining an experimental model for an experiment for confirming the state of the polarizing plate when the alignment bar is pressed against the polarizing plate in the position adjusting step.
- FIG. 8 is a drawing showing an image at the time of a collision in a collision experiment using a polarizing plate of a comparative example.
- FIG. 9 is a drawing showing an image at the time of a collision in a collision experiment using the polarizing plate of the example.
- FIG. 1 is a perspective view of a polarizing plate according to an embodiment.
- a polarizing plate 10 shown in FIG. 1 is a polarizing plate used for manufacturing a liquid crystal panel.
- the shape (planar shape) of the polarizing plate 10 viewed from the thickness direction of the polarizing plate 10 is a rectangle as shown in FIG. Examples of the short side length of the rectangle are 50 mm to 80 mm, and examples of the long side length are 90 mm to 135 mm.
- an example of the polarizing plate 10 is a polarizing plate having a long side length of 113.15 mm and a short side length of 64.80 mm, and another example of the polarizing plate 10 is a long side length.
- the planar view shape of the polarizing plate 10 is not limited to a rectangle, and may be a square, for example.
- the planar view shape of the polarizing plate 10 should just be according to the shape of the liquid crystal panel 20 to which the polarizing plate 10 is applied. Usually, if the shape of the liquid crystal panel 20 is rectangular, the shape of the polarizing plate 10 is also rectangular. If the shape of the liquid crystal panel 20 is square, the shape of the polarizing plate 10 is also square. In the following description, the plan view shape of the polarizing plate 10 is a rectangle unless otherwise specified.
- the polarizing plate 10 includes a polarizing plate body 13 in which a polarizer protective layer 12 is laminated on a polarizer layer 11, and a protective film 14 provided on the polarizer protective layer 12 to protect the polarizing plate body 13.
- the laminated polarizing plate includes an adhesive layer 15 laminated on the polarizer layer 11 in contact with the polarizer layer 11, and a release film 16 attached to the adhesive layer 15.
- the polarizer layer 11 is a layer that selectively transmits light (p-polarized light or s-polarized light) whose polarization direction (predetermined direction) is the polarization axis direction of the polarizer layer 11 among light incident on the polarizer layer 11. is there.
- An example of the material of the polarizer layer 11 is polyvinyl alcohol (polyvinyl alcohol).
- An example of the thickness of the polarizer layer 11 is 7 ⁇ m to 30 ⁇ m.
- the polarizer protective layer 12 is bonded to the polarizer layer 11 and is a layer for protecting the polarizer layer 11.
- An example of the material of the polarizer protective layer 12 is triacetylcellulose (TAC).
- An example of the thickness of the polarizer protective layer 12 is 20 ⁇ m to 50 ⁇ m.
- the polarizer protective layer 12 is substantially transparent to light incident on the polarizer layer 11.
- the protective film 14 is a film provided on the surface of the polarizer protective layer 12 opposite to the polarizer layer 11 to prevent the polarizing plate body 13 from being damaged.
- the protect film 14 is also a film for adjusting the bending resistance for imparting a certain bending resistance to the polarizing plate 10. Since the protective film 14 is for preventing the polarizing plate body 13 from being damaged, the protective film 14 is required to be strong. For this reason, when the protective film 14 is laminated on the polarizer protective layer 12, the bending resistance can be adjusted.
- the protective film 14 is detachably bonded to the polarizer protective layer 12. Examples of the material of the protective film 14 include polyethylene terephthalate (PET) and polypropylene (polypropylene, PP). An example of the thickness of the protective film 14 is 30 ⁇ m to 90 ⁇ m. A preferable thickness of the protective film 14 is 45 ⁇ m to 80 ⁇ m.
- the adhesive layer 15 is provided on the surface of the polarizer layer 11 opposite to the polarizer protective layer 12.
- the pressure-sensitive adhesive layer 15 is for attaching a polarizing plate body 13 composed of the polarizer layer 11 and the polarizer protective layer 12 to the liquid crystal cell.
- An example of the material of the adhesive layer 15 is an acrylic adhesive, and an example of the thickness of the adhesive layer 15 is 5 ⁇ m to 30 ⁇ m.
- the release film 16 prevents the polarizing plate 10 from adhering to another member via the adhesive layer 15 or foreign matter from adhering to the adhesive layer 15 before the polarizing plate 10 is attached to the liquid crystal cell. It is a film. Since the release film 16 is for preventing sticking and preventing foreign matter adhesion, the release film 16 is not required to have strength. Therefore, even if the release film 16 is bonded to the adhesive layer 15, the influence of the bending resistance is slight. Examples of the material of the release film 16 are PET and polyethylene, and examples of the thickness of the release film 16 are 20 ⁇ m to 40 ⁇ m.
- a configuration in which the release film 16 is peeled off from the configuration of the polarizing plate 10 shown in FIG. 1, that is, a protective film 14 is provided on one surface of the polarizing plate body 13, and the other surface (protect The laminate in which the adhesive layer 15 is provided on the side opposite to the film 14 is also referred to as a polarizing plate 10A.
- polarizing plate 10B what the protective film 14 peeled from 10A of polarizing plates is also called polarizing plate 10B.
- the bending resistance of the polarizing plate 10A which is a laminate obtained by peeling the release film 16 from the polarizing plate 10, is 7.6 mN (776 mgf) or more, or 7.64 mN (780 mgf) or more.
- the bending resistance of the polarizing plate 10A is 12.0 mN (1225 mgf) or less, and preferably 11.77 mN (1200 mgf) or less.
- the bending resistance of the polarizing plate body 13 is 4.0 mN (408 mgf) or less, or 3.92 mN (400 mgf) or less.
- the bending resistance of the polarizing plate body 13 is 2.9 mN or more, or 2.94 mN or more.
- the above-explained bending resistance is a value measured by adopting the Gurley method as a measuring method using 4171E (Digital bending resistance / stiffness tester) of Thwing-Albert Instrument Co. .
- the above-mentioned bending resistance is the bending resistance measured as follows using the above-described measuring instrument. First, a sample as a measurement object is set in a measurement device, measurement is performed in the left-right direction with respect to a reference position in the measurement device, and the average value is set as the bending resistance of one measurement. Such measurement of the bending resistance is repeated five times, and the average value of the five times is adopted as the bending resistance for one sample.
- the polarizing plate 10 is produced as follows, for example. First, the polarizing plate main body 13 in which the polarizer protective layer 12 is formed on one surface of the polarizer layer 11 is produced. Thereafter, the protective film 14 is bonded onto the polarizer protective layer 12, and the release film 16 having the adhesive layer 15 attached is bonded to the surface of the polarizer layer 11 opposite to the polarizer protective layer 12. Get 10.
- the parameters that affect the bending resistance such as the material and thickness of the polarizer layer 11, the polarizer protective layer 12, and the protective film 14 constituting the polarizing plate 10 have properties that the polarizing plate 10 has as a polarizing plate.
- the polarizing plate 10A is selected to have a bending resistance of 7.6 mN or more, or 7.64 mN or more.
- the bending resistance of the polarizing plate 10 can be mainly adjusted by the thickness of the protective film 14, and by setting the thickness of the protective film 14 to the above-described range of 30 ⁇ m to 90 ⁇ m,
- the bending resistance of the polarizing plate 10A is easily set to 7.6 mN or more, or 7.64 mN or more.
- FIG. 2 is a drawing for explaining the configuration of an embodiment of a liquid crystal panel manufactured using the polarizing plate 10 shown in FIG. 1, and FIG. 2 (a) shows the polarizing plate shown in FIG. It is a perspective view of one embodiment of a liquid crystal panel manufactured using it.
- FIG. 2B is a side view of the liquid crystal panel shown in FIG.
- the polarizing plate body 13 is bonded to the front surface (first main surface) 21 a and the back surface (second main surface opposite to the first main surface) 21 b of the liquid crystal cell 21 via the adhesive layer 15. Has been configured.
- the liquid crystal cell 21 may be one used for a known liquid crystal panel 20.
- the liquid crystal cell 21 may be one in which a transparent electrode, an alignment film, a liquid crystal, an alignment film, a transparent electrode, a color filter, and a glass substrate are provided on a glass substrate.
- the pair of polarizing plate bodies 13 included in the liquid crystal panel 20 are arranged with respect to the liquid crystal cell 21 so that the polarization axes of the two polarizing plate bodies 13 are orthogonal to each other.
- the polarization axis direction of the polarizer layer 11 included in the polarizer body 13 disposed on the back surface 21b is orthogonal to the polarization axis direction of the polarizer layer 11 included in the polarizer body 13 disposed on the front surface 21a. ing.
- the polarizing plate 10 is held by the suction disk (holding device) 30 from the protect film 14 side.
- An example of the suction board 30 may be a vacuum suction board using a vacuum.
- an example of the material of the surface in contact with the polarizing plate 10 is stainless steel (SUS).
- SUS stainless steel
- the suction disk 30 is schematically shown.
- the suction plate 30 holds the polarizing plate 10 so that two orthogonal side surfaces of the polarizing plate 10 protrude outward from the suction plate 30 when viewed from the suction plate 30 side. .
- the release film 16 is peeled from the polarizing plate 10 while the polarizing plate 10 is held by the suction plate 30.
- the polarizing plate 10 ⁇ / b> A is held by the suction plate 30.
- the position of the polarizing plate 10 ⁇ / b> A is adjusted with respect to the suction plate 30 (position adjustment process).
- an alignment bar 40 having an L shape in plan view is used. Specifically, the inner surface 40 a of the alignment bar 40 is pressed against the side surface (a part of the outer peripheral surface) of the polarizing plate 10 A protruding from the suction plate 30 to align the polarizing plate 10 A with the suction plate 30.
- the thickness of the alignment bar 40 (the length in the thickness direction of the polarizing plate 10A) is usually the same as the thickness of the polarizing plate 10A or thicker than the polarizing plate 10.
- an example of the length in the thickness direction of the polarizing plate 10A is 5 mm to 8 mm.
- the static friction coefficient is 0.24 or less, and may be 0.22 or less. If the coefficient of static friction is less than 0.10, the polarizing plate 10A may move more than necessary when pressed by the alignment bar 40. Therefore, in order to accurately adjust the position, it is usually 0.10. It is above, 0.15 or more may be sufficient and 0.20 or more may be sufficient.
- a portable friction meter manufactured by Shinto Kagaku Co., Ltd.
- the inner surface 40a of the alignment bar 40 that is, the surface facing the polarizing plate 10A is a flat surface
- the inner surface 40a of the alignment bar 40 is a reference surface for alignment.
- region which opposes the side surface of 10 A of polarizing plates among the inner surfaces 40a should just be a flat surface.
- 10 A of polarizing plates are bonded to the liquid crystal cell 21 (bonding process).
- the suction plate 30 is moved and the polarizing plate 10 ⁇ / b> A is disposed on the bonding region in the liquid crystal cell 21.
- the suction plate 30 is tilted by about 10 degrees with respect to the liquid crystal cell 21, and the polarizing plate 10A is bonded to the liquid crystal cell 21 from the one side surface to the other side surface in the longitudinal direction of the polarizing plate 10A.
- the holding of the polarizing plate 10A by the suction board 30 is released.
- the polarizing plate 10A is bonded to the other surface of the liquid crystal cell 21 in the same manner as when the polarizing plate 10A is bonded to one surface (for example, the front surface 21a) of the liquid crystal cell 21.
- the protective film 14 is peeled off from each polarizing plate 10A (protective film removing step). Thereby, the liquid crystal panel 20 by which the polarizing plate 10B was bonded on both surfaces of the liquid crystal cell 21 is obtained.
- the polarizing plate 10 shown in FIG. 1 there is only one polarizer protective layer 12 that protects the polarizer layer 11. Further, in the liquid crystal panel 20 as a product, in particular, the liquid crystal panel 20 in a state of being incorporated in a liquid crystal television, the protect film 14 is peeled off. Therefore, the liquid crystal panel 20 is thinner than the case where the polarizer protective layers 12 are provided on both surfaces of the polarizer layer 11, that is, the two polarizer protective layers 12 are provided on the polarizer layer 11. Therefore, the configuration of the polarizing plate 10 shown in FIG. 1 contributes to the thinning of the liquid crystal panel 20.
- the liquid crystal panel 20 is to be thinned by using only one polarizer protective layer 12 that protects the polarizer layer 11 as described above, for example, the configuration of the polarizing plate 10 shown in FIG.
- the polarizing plate 10 ⁇ / b> B may fall from the suction plate 30 due to the pressing of the alignment bar 40.
- the protective film 14 is provided with respect to the polarizing plate main body 13, even if the polarizing plate main body 13 has one polarizer protective layer 12.
- a bending resistance of 7.6 mN or more, or 7.64 mN or more can be secured.
- the polarizing plate 10A is pushed by the alignment bar 40. It is difficult to deform (for example, bend).
- the fall of the polarizing plate 10A from the suction plate 30 due to the deformation of the polarizing plate 10A is suppressed. Therefore, if the liquid crystal panel 20 is manufactured using the polarizing plate 10, the manufacturing efficiency of the liquid crystal panel 20 is unlikely to decrease. Since the protective film 14 is peeled off after the polarizing plate 10A is bonded to the liquid crystal panel 20, the configuration of the polarizing plate 10 contributes to the thinning of the liquid crystal panel 20 as described above. Furthermore, since the protective film 14 is in contact with the suction plate 30 by providing the protective film 14, the polarizer protective layer 12 is not damaged when the liquid crystal panel 20 is manufactured.
- the polarizing plate body 13 When the bending resistance of the polarizing plate body 13 is 4.0 mN or less, or 3.92 mN or less, the polarizing plate body 13 itself is easily deformed (for example, curved). Therefore, the configuration of the polarizing plate 10 including the protective film 14 and having the bending softness of the polarizing plate 10A of 7.6 mN or more, or 7.64 mN or more is effective.
- the thickness of the protective film 14 that can be peeled off from the polarizing plate body 13 is 30 ⁇ m to 90 ⁇ m, it is easy to impart a bending resistance of 7.6 mN or more, or 7.64 mN or more to the polarizing plate 10A, and the protective film 14 Is easy to peel off.
- the thickness of the protection film 14 is preferably 45 ⁇ m to 80 ⁇ m. .
- a polarizing plate 10 having the configuration shown in FIG. 1 was prepared as the polarizing plate P1 of the example. That is, as the polarizing plate P 1, a polarizing plate body 13 in which a polarizer protective layer 12 is laminated on a polarizer layer 11, a protective film 14 is provided on the polarizer protective layer 12, and an adhesive layer 15 is provided on the polarizer layer 11. And the polarizing plate 10 provided with the peeling film 16 was used.
- the material of the polarizer layer 11 was PVA, and the thickness thereof was 28 ⁇ m.
- the material of the polarizer protective layer 12 was TAC, and the thickness thereof was 40 ⁇ m.
- the material of the protective film 14 was PET, and its thickness was 50 ⁇ m.
- the material of the adhesive layer 15 was an acrylic acid adhesive, and the thickness thereof was 25 ⁇ m.
- the material of the release film 16 was PET, and its thickness was 38 ⁇ m, and it was easily bent to such an extent that it could not maintain its shape alone.
- the polarizing plate P2 of the comparative example has the same layer structure as the polarizing plate 10 of the example.
- the material of the protective film was PET and the thickness was 38 ⁇ m. That is, the polarizing plate P2 of the comparative example has the thickness of the protective film and the surface on the opposite side of the protective film from the polarizer protective layer side (the surface of the protective film side of the polarizing plate P2) when the polarizing plate P2 is formed. Except for the point that the surface state (static friction coefficient) is different, it has the same configuration as the polarizing plate P1 of the example.
- the bending resistance of the polarizing plates P1 and P2 of Examples and Comparative Examples was measured.
- the measurement was performed according to the Gurley measurement method using the above-described method, that is, Thwing-Albert Instrument Co. 4171E (Digital bending resistance / stiffness tester) as a bending resistance measuring instrument.
- a sample an object to be measured is referred to as a sample, and the measurement method will be specifically described.
- a sample piece obtained by cutting the sample into a rectangular piece of 88.9 mm ⁇ 25.4 mm (3.5 inches ⁇ 1 inch) rectangular shape was used.
- the corner opposite the corner of the sample piece fitted in the clamp was fixed to a triangular jig. At this time, the length of the overlapping area with the jig was also set to 6.35 mm (0.25 inch).
- the jig was closely attached to the sample piece (positioned at a measurement value standard of 0.1 or less).
- E The vibrator weight on which the weight is mounted is stopped (positioned at the 0 point).
- F “MOTOR DIRECTION” in the measuring instrument was operated to measure the bending resistance of the sample pieces on the left and right sides. After the left and right measurements were finished, the average of the left and right was adopted as the bending resistance of one measurement.
- G The measurement steps shown in the above (a) to (f) were repeated 5 times, and the average value was adopted as the bending resistance of the sample.
- the bending resistance was measured according to the above procedure.
- the bending resistance was also measured for the polarizing plate main body 13 including the polarizer layer 11 and the polarizer protective layer 12. Further, the bending resistance of the polarizing plate body 13 in the comparative example was also measured.
- Table 1 The measurement results of the bending resistance are shown in Table 1. Since the unit of the bending resistance output from the measuring device is mgf, Table 1 includes the numerical value expressed by “mgf” and the numerical value obtained by converting the numerical value into the SI unit system. Numerical values converted to SI units are shown in parentheses in Table 1.
- a SUS plate (stainless steel plate) 51 is disposed on the base plate 50 as a model of the suction plate 30, and polarization is performed so that the side surface Pa of the polarizing plate P protrudes from the SUS plate 51.
- the plate P was placed on the SUS plate 51.
- ten glass plates size: 100 mm ⁇ 100 mm
- a constant load is applied to the polarizing plate P toward the SUS plate 51 side.
- a rectangular parallelepiped shape is used instead of the alignment bar 40 from a position (a position indicated by a broken line in FIG.
- the collision of the block 53 with the polarizing plate P was performed as follows. As shown in FIG. 7, in a state where a rubber band 54 is stretched between the lower surface of the base plate 50 and the side surface of the block 53 opposite to the SUS plate 51, the surface facing the SUS plate 51 of the block 53 The block 53 was separated from the SUS plate 51 until the distance from the side surface Pa of the polarizing plate P became a certain distance, and the block 53 was made to collide with the polarizing plate P by the restoring force of the rubber band 54.
- the experiment described for the polarizing plate P was performed for each of the cases where the polarizing plate P1 and the polarizing plate P2 were used as the polarizing plate P.
- the polarizing plate P2 is greatly curved. If the polarizing plate P2 is curved to the extent shown in FIG. 8, it is estimated that the polarizing plate P2 falls from the suction disk 30 due to the bending.
- the bending of the polarizing plate P1 is reduced as shown in FIG. I understand.
- the release film 16 used is so flexible that it cannot be kept alone, and does not affect the bending resistance of the polarizing plate P1.
- the polarizer protective layer 12 of the polarizing plate body 13 has Even if the number is one, the polarizing plate 10A can be aligned with the suction plate 30 without dropping the polarizing plate 10A from the suction plate 30.
- the alignment bar 40 is not limited to an L-shape, and may be a linear shape as long as it has a reference surface that can adjust the position of the polarizing plate 10A.
- the position adjustment process the case where the two side surfaces of the polarizing plate and the reference surface are relatively pressed is exemplified. However, the position adjustment is performed by relatively pressing a part of the outer periphery of the polarizing plate and the reference surface. do it.
- the liquid crystal panel 20 has been described on the assumption that the polarizing plate body 13 is bonded via the adhesive layer 15, that is, the polarizing plate 10 ⁇ / b> B is bonded to the liquid crystal cell 21.
- the thing before the pasting process may be used.
- the protective film 14 may be peeled off when the liquid crystal display device is manufactured using the liquid crystal panel 20.
- SYMBOLS 10 ... Polarizing plate 10A ... Polarizing plate (laminate), 11 ... Polarizer layer, 12 ... Polarizer protective layer, 13 ... Polarizing plate main body, 14 ... Protective film, 20 ... Liquid crystal panel, 21 ... Liquid crystal cell, 30 ... Suction disk (holding device), 40 ... alignment bar, 40a ... inner surface (reference surface).
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Abstract
Description
実施例及び比較例の偏光板P1,P2の剛軟度の測定を行った。測定は、前述した方法、すなわち、Thwing-Albert Instrument Co.の4171E(Digital bending resistance/stiffness tester)を剛軟度測定機器として用い、ガーレ式の測定方法に従って行った。以下、測定すべき対象をサンプルと称し、測定方法について具体的に説明する。測定では、サンプルを88.9mm×25.4mm(3.5インチ×1インチ)の長方形形状の四角片に裁断したサンプル片を用いた。
(a)測定機器の水平合わせを行った。
(b)サンプルに応じたサンプル情報及び測定方法を測定機器(4171E)に設定した。
(b-1)測定機器のサンプル片の長さの設定のために、測定機器が有する“Length”メモリを“3.5”に設定した。“Length”メモリの選択肢は、上記“3.5”の他、“1”、 “1.5”、 “2.5” 、“4.5”がある。各メモリの単位は、インチである。
(b-2)測定サンプルの幅の設定のために、測定機器が有する”WIDTH“メモリを、”1”に設定した。“WIDTH“メモリの選択肢は、上記”1”の他、”5”、 ”2”がある。各メモリの単位は、インチである。
(b-3)錘の搭載位置の設定のために、測定機器が有する“WEIGHT POSITION”メモリを、”1”に設定した。“WEIGHT POSITION”メモリの選択肢は、上記”1”の他、”2”、 ”4”がある。各メモリの単位は、インチである。
(b-4)使用する錘を測定機器に設定するために、測定機器が有する“WEIGHT gm.”メモリを”25“に設定した。“WEIGHT gm.”メモリの選択肢は、上記”25”の他、”5”、 ”50”、”200”がある。
(c)測定機器のクランプにサンプル片の片方の一方の角を固定した。この際、クランプに固定すべき角をクランプの上段に密着させ、6.35mm(0.25インチ)をクランプに嵌めた。クランプに嵌められたサンプル片の角と対向する角を、三角形状の治具に固定した。この際、治具との重複領域の長さも6.35mm(0.25インチ)とした。
(d)そして、治具をサンプル片に最大限密着させた(測定値基準0.1以下に位置させる)。
(e)錘が装着されている振動子錘を停止させた(0点に位置させる)。
(f)測定機器における”MOTOR DIRECTION”を操作し、左側及び右側に対してそれぞれサンプル片の剛軟度を測定した。左右の測定を終えて、左右の平均を一回の測定の剛軟度として採用した。
(g)上記(a)~(f)に示した測定工程を5回繰り返し、平均した値をサンプルの剛軟度として採用した。
偏光板P1,P2について、静摩擦係数を測定した。スライダーにハードクローム処理を施した黄銅を用いたポータブル摩擦計(TYPE:94i-II 新東科学株式会社製)を使用して、プロテクトフィルム側表面の静摩擦係数の測定を行った。測定の結果、偏光板P1のプロテクトフィルム側表面の静摩擦係数は、0.22、偏光板P2のプロテクトフィルム側表面の静摩擦係数は、0.25であった。
位置調整工程においてアライメントバー40を偏光板に押し当てた場合の偏光板の状態を確認する実験を行った。衝突模擬実験は、偏光板P1,P2に対して次のようにして行った。以下の説明では、偏光板P1,P2を偏光板Pと称する。
・超高速カメラ:i-SPEED 3(オリンパス社製)
・レンズ:24-70mm F2.8 EX DG MACRO F/SIGMA
・フレームレート(FPS):2000fps
Claims (10)
- 所定方向に偏光した光を選択的に通過させる偏光子層を含む偏光板であって、
前記偏光子層上に前記偏光子層を保護するための偏光子保護層が積層された偏光板本体と、
前記偏光子保護層上に積層されるプロテクトフィルムと、
前記偏光子層において前記偏光子保護層と反対側に、前記偏光子層に接して積層される粘着層と、
を備え、
前記粘着層、前記偏光板本体及び前記プロテクトフィルムからなる積層体の剛軟度が、7.6mN以上である、
偏光板。 - 前記積層体の剛軟度が、7.64mN以上である、
請求項1に記載の偏光板。 - 前記偏光板本体の剛軟度が4.0mN以下である、
請求項1又は2に記載の偏光板。 - 前記偏光板本体の剛軟度が3.92mN以下である、
請求項1~3の何れか一項に記載の偏光板。 - 前記偏光板の厚さ方向から見た形状は、長方形であり、
前記長方形の長辺は、90mm~135mmであり、
前記長方形の短辺は、50mm~80mmである、
請求項1~4の何れか一項に記載の偏光板。 - 前記プロテクトフィルムの材料は、ポリエチレンテレフタレート又はポリプロピレンである、
請求項1~5の何れか一項に記載の偏光板。 - 前記プロテクトフィルムの厚さは、30μm~90μmである、
請求項1~6の何れか一項に記載の偏光板。 - 前記プロテクトフィルムは、前記偏光子保護層に剥離可能に設けられている、請求項1~7の何れか一項に記載の偏光板。
- 所定方向に偏光した光を選択的に通過させる偏光子層上に前記偏光子層を保護するための偏光子保護層が積層された偏光板本体が液晶セルに貼合された液晶パネルを製造する方法において、
請求項1~8の何れか一項に記載の偏光板の前記プロテクトフィルム側を保持装置によって保持した状態において、前記偏光板の外周面の少なくとも一部と基準面とを相対的に押し合わせることによって、前記保持装置に対して前記偏光板の位置を調整する工程と、
前記保持装置に対して位置調整された前記偏光板を、前記粘着層を介して前記液晶セルに貼り合わせる工程と、
を備える、液晶パネルの製造方法。 - 前記液晶セルに貼合された前記偏光板から前記プロテクトフィルムを取り除く工程を更に備える、請求項9に記載の液晶パネルの製造方法。
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