WO2007126108A1 - 複合偏光板及びそれを用いた液晶表示装置 - Google Patents
複合偏光板及びそれを用いた液晶表示装置 Download PDFInfo
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- WO2007126108A1 WO2007126108A1 PCT/JP2007/059347 JP2007059347W WO2007126108A1 WO 2007126108 A1 WO2007126108 A1 WO 2007126108A1 JP 2007059347 W JP2007059347 W JP 2007059347W WO 2007126108 A1 WO2007126108 A1 WO 2007126108A1
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- Prior art keywords
- polarizing plate
- film
- retardation film
- polarizer
- composite polarizing
- Prior art date
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Classifications
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
-
- 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
- G02B5/305—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 including organic materials, e.g. polymeric layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding 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
- 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
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/54—Arrangements for reducing warping-twist
Definitions
- the present invention relates to a composite polarizing plate and a liquid crystal display device using the same. Specifically, the present invention relates to a composite polarizing plate useful for making a liquid crystal display device excellent in viewing angle characteristics and a liquid crystal display device using the same.
- liquid crystal displays In recent years, low-power consumption, low-voltage, light-weight and thin liquid crystal displays are rapidly spreading as information display devices such as mobile phones, personal digital assistants, computer monitors, and televisions. With the development of liquid crystal technology, liquid crystal displays in various modes have been proposed, and problems with liquid crystal displays such as response speed, contrast, and narrow viewing angle are being resolved. However, it is still pointed out that the viewing angle is narrower than that of cathode ray tubes (CR T), and various attempts have been made to expand the viewing angle.
- CR T cathode ray tubes
- One such liquid crystal display device is a vertical alignment (VA) mode liquid crystal display device in which rod-like liquid crystal molecules having positive or negative dielectric anisotropy are aligned perpendicularly to the substrate. is there.
- VA vertical alignment
- the light passes through the liquid crystal layer without changing the polarization.
- linearly polarizing plates on the top and bottom of the liquid crystal panel so that the polarization axes are orthogonal to each other, almost perfect black display can be obtained when viewed from the front, and a high contrast ratio can be obtained. Can do.
- JP-A-8-43812 and JP-A-9-325216 in which at least one of the protective layers of the polarizer is composed of a birefringent film. It is described. JP-A-7-287123 and JP-A-2002-221619 describe that a protective layer of a polarizer is composed of a norbornene resin having a low photoelastic coefficient and a low moisture permeability.
- the present inventors have developed a composite polarizing plate obtained by adhering a retardation film to one surface of a polarizer, which is excellent in dimensional stability, can be reduced in thickness, and has good adhesiveness. I have been studying earnestly. As a result, if a polypropylene resin film is used as the retardation film to be bonded to the polarizer, the photoelastic coefficient can be sufficiently reduced, the thickness can be reduced, and the moisture permeability can be reduced. As a result, the present inventors have found that the adhesiveness of the resin is good.
- one of the objects of the present invention is a composite polarized light that is excellent in dimensional stability, can express a desired retardation value with a small thickness, and has good adhesion between the polarizer and the retardation film.
- Another object of the present invention is to apply this composite polarizing plate to a liquid crystal display device.
- a polarizer made of polyvinyl alcohol resin has a transparent protective layer on one side, and a retardation film made of polypropylene resin is adhered to the surface of the polarizer opposite to the transparent protective layer.
- a composite polarizing plate is provided.
- the retardation film made of this polypropylene resin is not limited to a homopolymer of propylene, but may be a copolymer with other monomers mainly composed of propylene.
- liquid crystal display device in which the composite polarizing plate is laminated on at least one side of the liquid crystal cell.
- FIG. 1 is a perspective view schematically showing a configuration of a composite polarizing plate according to the present invention.
- 2 is a perspective view schematically showing a configuration example when the composite polarizing plate is applied to a liquid crystal display device, and also shows a configuration of Example 3.
- FIG. 1 is a perspective view schematically showing a configuration of a composite polarizing plate according to the present invention.
- 2 is a perspective view schematically showing a configuration example when the composite polarizing plate is applied to a liquid crystal display device, and also shows a configuration of Example 3.
- FIG. 1 is a perspective view schematically showing a configuration of a composite polarizing plate according to the present invention.
- FIG. 3 is an equi-contrast curve showing viewing angle characteristics when the composite polarizing plate of the present invention is mounted on a liquid crystal panel in Example 3.
- Fig. 4 is an isocontrast curve showing the viewing angle characteristics of the liquid crystal television itself (before disassembly) used in Example 3. Explanation of symbols
- a retardation film made of a polypropylene resin is adhered to a surface of a polarizer having a transparent protective layer on one side opposite to the transparent protective layer to obtain a composite polarizing plate.
- the layer structure of the composite polarizing plate according to the present invention is shown in FIG. 1 in a schematic perspective view in which each layer is separated.
- the composite polarizing plate 10 of the present invention is provided with a transparent protective layer 40 on one side of a polarizer 30, and on the surface opposite to the transparent protective layer 40 of the polarizer 30.
- a retardation film 20 made of a propylene resin film is disposed.
- Polarizer 30 is made of polyvinyl alcohol resin and is generally used in this field. Can be.
- adsorbing and orienting a dichroic dye on a polyvinyl alcohol-based resin to absorb linearly polarized light having a vibration surface in a certain direction and transmitting linearly polarized light having a vibration surface in a direction perpendicular thereto.
- a given linear polarizer can be used.
- the dichroic dye iodine or a dichroic organic dye is used.
- Such a polarizer can be obtained by uniaxial stretching of a polyvinyl alcohol resin film, dyeing with a dichroic dye, and boric acid treatment after dyeing.
- the transparent protective layer 40 disposed on one side of the polarizer 30 is, for example, acetyl ether represented by triacetyl cellulose (TAC) or diacetyl cellulose, which has been conventionally used as a protective layer for polarizers. It is advantageous to use a cellulosic resin film, but it may also be a cyclic polyolefin resin film typified by a norbornene resin or a polypropylene resin film. A phase difference film 20 made of a polypropylene resin is provided on the other surface of the polarizer 30. This retardation film 20 can be obtained by stretching a polypropylene resin film.
- Polypropylene resin is a resin composed mainly of propylene units, and is generally crystalline.
- It can be composed of propylene homopolymers, and is mainly composed of propylene with a small amount of other comonomers, for example, It may be copolymerized up to about 20% by weight.
- a polypropylene / ethylene copolymer containing 10% by weight or less of ethylene units by copolymerizing ethylene is one of the preferred polypropylene resins.
- the reason why the polypropylene resin is selected as the resin constituting the retardation film 20 will be described.
- Bisphenol A type polycarbonate which has been widely used for retardation films, has excellent retardation due to stretching, but has a large photoelastic coefficient of approximately 2 7 X 10-13 cm 2 Zdyne. For this reason, it is easy to cause white spots when pasting.
- triacetyl cellulose which has been widely used for the protective layer of polarizers, has excellent photoelasticity, although it has excellent adhesion to polarizers. About 1 3 X 1 0- 13 cm 2 / dyne greatly smaller expression of retardation by stretching.
- norbornene resins such as those described in JP-A-7-287123 and JP-A-2002-221619 [typically, "Zeonor sold by Nippon Zeon Co., Ltd.””Thereis” a ton “sold by JSR Co., Ltd.) has a small photoelastic coefficient of about 4 X 1 0 _13 cm 2 Z dyne, and is effective in suppressing uneven sticking and white spots.
- a phase difference is hardly exhibited even by stretching, a certain thickness is required to obtain a desired phase difference.
- the norbornene-based resin film has a problem in terms of adhesion to a polarizer made of a polyvinyl alcohol-based resin.
- polypropylene resin has a small photoelastic coefficient of about 2 X 10 _13 cm 2 / dyne and low moisture permeability. Further, it is easy to develop a phase difference by stretching, and surprisingly, the adhesion of the polypropylene resin film to the polarizer is good, if not as much as that of a triacetyl cell mouthpiece, and various known adhesives can be used. When used, it has been found that a polypropylene resin film adheres to a polarizer made of polyvinyl alcohol resin with sufficient strength. For this reason, the retardation film disposed on one surface of the polarizer is made of polypropylene resin.
- the polypropylene resin can be produced by a method of homopolymerizing propylene using a known polymerization catalyst or a method of copolymerizing propylene and another copolymerizable comonomer.
- known polymerization catalysts include the following.
- Ti-Mg-based catalyst comprising a solid catalyst component containing magnesium, titanium and halogen as essential components
- a solid catalyst component containing magnesium, titanium, and halogen as essential components is combined with an organoaluminum compound and an electron donating compound.
- organoaluminum compound include triethylaluminum, triisobutylaluminum, a mixture of triethylaluminum and jetylaluminum chloride, and tetraethyldialumoxane. Preferred as an electron-donating compound.
- Examples of such compounds include cyclohexyldimethoxysilane, tert-butylpropyldimethoxysilane, tert-butylethyldimethoxysilane, and dicyclopentyldimethoxysilane.
- examples of the solid catalyst component containing magnesium, titanium, and halogen as essential components include those described in JP-A-61-218606, JP-A-61-287904, JP-A-7-216017, and the like.
- examples of the catalyst system include the catalyst systems described in Japanese Patent No. 2587251, Japanese Patent No. 2627669, Japanese Patent No. 2668732, and the like.
- Polypropylene resins include, for example, solution polymerization using an inert solvent typified by hydrocarbon compounds such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene, and xylene, and liquid monomers. It can be produced by a bulk polymerization method using as a solvent, a gas phase polymerization method in which a gas monomer is polymerized as it is, or the like. Polymerization by these methods may be carried out batchwise or continuously.
- an inert solvent typified by hydrocarbon compounds such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene, and xylene, and liquid monomers. It can be produced by a bulk polymerization method using as a solvent, a gas phase polymer
- the stereoregularity of the polypropylene resin may be any of isotactic, syndiotactic and atactic.
- a syndiotactic or isotactic polypropylene resin is preferred from the viewpoint of heat resistance. Used frequently.
- the polypropylene resin used in the present invention can be composed of a homopolymer of propylene, and contains a small amount of a comonomer mainly composed of propylene and copolymerizable therewith, for example, 20% by weight or less, preferably 10% by weight or less. It may be copolymerized at a ratio. When a copolymer is used, the amount of comonomer is preferably 1% by weight or more.
- the comonomer copolymerized with propylene can be, for example, ethylene or ⁇ -olefin with 4 to 20 carbon atoms.
- ⁇ -olefins include the following.
- ⁇ -olefins Preferred among ⁇ -olefins is Q having 4 to 12 carbon atoms; -olefins, specifically 1-butene, 2-methyl-1-propene; 1 monopentene, 2-methyl-1 -Butene, 3-methyl-1-butene; 1-hexene, 2-ethyl 1-butene, 2,3-dimethyl-1-butene, 2-methyl-1, 1-pentene, 3-methyl-1, 1-pentene, 4-methyl-1, 1-pentene, 3, 3-dimethyl-1, 1-butene; 1_heptene, 2-methyl-1 1-hexene, 2,3-dimethyl-1-pentene, 2-ethyl-1-pentene, 2-methyl-3-ethyl-1-butene; 1-octene, 5-methyl-1-monoheptene, 2-ethyl-1-hexene, 3, 3—dimethyl-1-monohexene, 2_methyl-3-ethyl-1-pentene,
- the copolymer may be a random copolymer or a block copolymer.
- Preferred copolymers include propylene / ethylene copolymers and propylene
- ethylene unit content and 1-butene unit content are, for example, those of the “Polymer Analysis Handbook” (published by Kinokuniya, 1945) Infrared (IR) spectrum measurement can be performed by the method described on page 6 1 6.
- propylene as a main component and a random copolymer with any unsaturated hydrocarbon.
- a copolymer with ethylene is preferred.
- unsaturated hydrocarbons other than propylene have a copolymerization ratio of about 1 to 10% by weight, and a more preferable copolymerization ratio is 3 to 7% by weight. .
- the ratio exceeds 10% by weight, the melting point of the resin tends to decrease and the heat resistance tends to deteriorate, which is not preferable.
- the total content of units derived from all the comonomer contained in the copolymer is preferably in the above range.
- the polypropylene resin used in the present invention has a melt flow rate (MFR) of 0.1 to 200 g measured at a temperature of 2 30 ° C and a load of 2 1.1 8 N in accordance with nSK 7210. / 10 min, especially 0.5 to 50 g Z l 0 min.
- MFR melt flow rate
- the polypropylene resin may contain a known additive as long as the effects of the present invention are not impaired. Examples of the additive include an antioxidant, an ultraviolet absorber, an antistatic agent, a lubricant, a nucleating agent, an antifogging agent, and an antiblocking agent.
- Antioxidants include, for example, phenolic antioxidants, phosphorus antioxidants, thioic antioxidants, hindered amine light stabilizers, etc., and, for example, phenolic antioxidant mechanisms in one molecule.
- a composite type antioxidant having a unit having a phosphorus antioxidant mechanism can also be used.
- the UV absorber include UV absorbers such as 2-hydroxybenzophenone-based hydroxyphenylbenzotriazole, and benzoate-based UV blockers.
- the antistatic agent may be any of a polymer type, an oligomer type, and a monomer type.
- Examples of the lubricant include higher fatty acid amides such as strong acid amide oleate amide, higher fatty acids such as stearic acid, and salts thereof.
- nucleating agent examples include sorbitol nucleating agents, organophosphate nucleating agents, and polymer nucleating agents such as polyvinylcycloalkane.
- sorbitol nucleating agents examples include sorbitol nucleating agents, organophosphate nucleating agents, and polymer nucleating agents such as polyvinylcycloalkane.
- anti-blocking agent spherical or nearly fine particles can be used regardless of whether they are inorganic or organic. A plurality of these additives may be used in combination.
- Polypropylene resin can be formed into an original film by any method.
- This raw film is transparent and has substantially no in-plane retardation.
- an extrusion molding method from a molten resin, a resin dissolved in an organic solvent is cast on a flat plate,
- An original film of polypropylene resin having substantially no in-plane retardation can be obtained by a solvent casting method in which the solvent is removed to form a film.
- Polypropylene resin is melt-kneaded by rotation of a screw in an extruder and extruded from a ⁇ die into a sheet.
- the temperature of the extruded molten sheet is from 1 80 to
- the temperature of the molten sheet at this time is lower than 180 ° C., the stretchability is not sufficient, the thickness of the obtained film becomes non-uniform, and there is a possibility that the film has a retardation difference. If the temperature exceeds 300 ° C., the resin is easily deteriorated and decomposed, and bubbles may be generated in the sheet or carbides may be contained.
- the extruder may be a single screw extruder or a twin screw extruder.
- the L / D which is the ratio of the length L to the diameter D of the screw, is about 24 to 36
- the compression ratio which is the ratio to the volume (the former / the latter)
- Barrier type screws with L ZD of 28-36 and compression ratio of 2.5-3.5 are used from the viewpoint of uniform melt-kneading while suppressing deterioration and decomposition of polypropylene resin. It is preferable.
- the inside of the extruder is preferably a nitrogen atmosphere or a vacuum.
- an orifice of 1 mm ⁇ to 5 ⁇ ⁇ is provided at the tip of the extruder to increase the resin pressure at the tip of the extruder. It is also preferable.
- Increasing the resin pressure at the tip of the orifice extruder means increasing the back pressure at the tip, which can improve the stability of extrusion.
- the diameter of the orifice used is more preferably 2 ⁇ ⁇ or more and 4 ⁇ or less.
- the die used for extrusion preferably has no fine steps or scratches on the surface of the resin flow path, and the lip part has a coefficient of friction with the molten polypropylene resin. It is preferable to have a sharp wedge shape that is plated or coated with a small material, and the lip tip is polished to less than 0.3 mm. Examples of the material having a small friction coefficient include tungsten carbide type and fluorine type special plating. By using such a saddle die, it is possible to suppress the generation of eyes and simultaneously suppress the die line, so that a resin film having excellent appearance uniformity can be obtained.
- the manifold has a coat hanger shape and preferably satisfies the following condition (1) or (2), and more preferably satisfies the condition (3) or (4). .
- T-die thickness direction length 180mm
- T-die lip width 1500mm or more:
- T-die Length in height direction of T-die> 280mm
- the molten sheet extruded from the T-die includes a metal cooling roll (also called a chill port or a casting roll) and an elastic body that rotates in pressure contact with the circumferential direction of the metal cooling roll. It is desired to be cooled and solidified by pinching between the rolls. Film can be obtained.
- the evening roll may be a surface in which an elastic body such as rubber is used as it is, or may be one in which the surface of the elastic body mouth is covered with an outer cylinder made of a metal sleeve.
- cooling is usually performed by directly sandwiching a molten sheet of polypropylene resin between the metal cooling roll and the touch roll.
- a biaxially stretched film of a thermoplastic resin may be interposed between the molten sheet of polypropylene resin and the touch roll to sandwich the roll.
- both the cooling roll and the touching roll have their surface temperatures lowered, It is necessary to quench the molten sheet.
- the surface temperature of both rolls is adjusted in the range of 0 ° C or higher and 30 ° C or lower. When these surface temperatures exceed 30 ° C., it takes time to cool and solidify the molten sheet, so that the crystal component in the polypropylene resin grows, and the resulting film is inferior in transparency.
- the surface temperature of the roll is preferably less than 30 ° C, more preferably less than 25 ° C.
- condensation will form on the surface of the metal cooling port and water droplets will adhere to it, which tends to deteriorate the appearance of the film.
- the surface condition of the metal cooling port used is transferred to the surface of the polypropylene resin film, the thickness accuracy of the resulting polypropylene resin film can be reduced if the surface is uneven. There is sex. Therefore, it is preferable that the surface of the metal cooling roll is in a mirror surface state as much as possible.
- the roughness of the surface of the metal cooling roll is preferably 0.3 S or less, expressed in the standard sequence of the maximum height, and more preferably 0.1 S to 0.2 S. Is more preferable.
- the surface hardness of its elastic body is measured by the spring type hardness test (A type) specified in ⁇ IS K 6301. It is preferably ⁇ 80, and more preferably 70 ⁇ 80. It is more preferable.
- a type spring type hardness test
- the pressure (linear pressure) at which the molten sheet is clamped is determined by the pressure with which the touch roll is pressed against the metal cooling port.
- the linear pressure is preferably not less than 5 O NZcm and not more than 30 ON / cm, and more preferably not less than 10 O NZcm and not more than 25 ON / cm.
- the thermoplastic resin constituting the biaxially stretched film is a polypropylene resin.
- Any resin that does not heat-seal strongly can be used. Specific examples include polyester, polyamide, polyvinyl chloride, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and polyacrylonitrile. Of these, polyesters that undergo little dimensional change due to humidity, heat, etc. are most preferred.
- the thickness of the biaxially stretched film is usually about 5 to 50 m, preferably 10 to 30 m.
- the distance (air gap) from the lip of the T die to the pressure between the metal cooling roll and the evening roll is not more than 200 thighs, and more preferably not more than 160 hours. It is more preferable.
- the molten sheet extruded from the T-die is stretched from the lip to the roll, and orientation tends to occur. By shortening the air gap as described above, a film having a smaller orientation can be obtained.
- the lower limit of the air gap is determined by the diameter of the metal cooling port used and the diameter of the outlet port, and the tip shape of the lip used, and is usually 50 mm or more.
- Processing speed when producing polypropylene resin film by this method is The time required for cooling and solidifying the sheet is determined.
- the diameter of the metal cooling roll to be used is increased, the distance at which the molten sheet is in contact with the cooling roll becomes longer, so that production at a higher speed becomes possible.
- the processing speed is about 5 to 20 m / min at the maximum.
- the molten sheet sandwiched between the metal cooling roll and the touch roll is cooled and solidified by contact with the roll. Then, after slitting the end as necessary, the film is wound up by a winder.
- the film in order to protect the surface until the film is used, it may be wound in a state in which a surface protective film made of another thermoplastic resin is bonded to one side or both sides.
- a surface protective film made of another thermoplastic resin is bonded to one side or both sides.
- the polypropylene-based resin film obtained as described above is stretched to develop a phase difference to obtain a phase difference film.
- a material that exhibits biaxial birefringence by biaxial stretching is preferred.
- the stretching ratio at this time is about 1.1 to 10 times in the longitudinal direction and the lateral direction in which the optical axis is developed (the direction in which the stretching ratio is large and the slow axis). What is necessary is just to select suitably from the range of about 1.1 to 7 times in the orthogonal direction (the direction where the draw ratio is small and the fast axis) according to the required phase difference value.
- the optical axis may be developed in the lateral direction of the film, or the optical axis may be developed in the longitudinal direction.
- the retardation value of the retardation film 20 will be described.
- the in-plane retardation value (Ro) is in the range of 40 to 50 nm, and the thickness direction retardation value (R th) is 2 to 5 It is preferably in the range of 0 0 mn. From this range, an appropriate selection may be made in accordance with the characteristics required for the applied liquid crystal display device.
- the in-plane retardation value (R o) is more preferably not more than 100 dishes, and the thickness direction retardation value (R th) is more preferably 8 O nm or more, and 30 O nm. It is as follows.
- the refractive index in the in-plane slow axis direction is ⁇
- the in-plane fast axis direction (direction perpendicular to the slow axis in the plane)
- ny the thickness direction refractive index
- nz the thickness
- d the thickness
- the in-plane retardation value (Ro) and thickness direction retardation value (Rth) are defined by the following equations (I) and (II), respectively.
- the polypropylene resin exhibits a phase difference due to stretching. Therefore, the difference between nx and ny or the difference between nx or ny and nz in the above equation tends to increase. Therefore, a film obtained by stretching a polypropylene resin film can exhibit a desired retardation value by appropriate stretching even if the thickness d is reduced.
- the retardation film made of the polypropylene resin according to the present invention preferably has a thickness of 60 m or less. If it is too thin, the handling property may be deteriorated, and therefore it is preferably 5 m or more.
- the thickness of the retardation film is more preferably 10 xm or more and 40 m or less.
- the optimal axial relationship between the two can be selected in consideration of the viewing angle characteristics and color change characteristics of the target liquid crystal display device. That's fine.
- the slow axis of the retardation film 20 and the absorption axis of the polarizer 30 are often arranged so as to be in a substantially parallel or substantially orthogonal relationship.
- “almost” in the case of almost parallel or almost orthogonal is preferably the relationship described there (parallel or orthogonal), but the deviation up to about ⁇ 10 degrees around that is acceptable. means.
- the angle deviation is preferably within ⁇ 5 degrees, more preferably within ⁇ 2 degrees.
- an adhesive containing an epoxy resin, urethane resin, cyanoacrylate resin, acrylamide resin, or the like can be used. Either of these Even if it is, good adhesion can be obtained.
- a preferable adhesive from the viewpoint of thinning the adhesive layer includes an aqueous adhesive, that is, an adhesive component dissolved in water or dispersed in water.
- a solventless adhesive specifically, an adhesive layer can be formed by reacting and curing a monomer or oligomer by heating or irradiation with active energy rays. .
- the water-based adhesive will be described.
- the adhesive component that can be a water-based adhesive include water-soluble cross-linkable epoxy resins and urethane resins.
- water-soluble crosslinkable epoxy resin examples include a polyamide epoxy resin obtained by reacting epichlorohydrin with a polyamide polyamine obtained by a reaction with diethylenetriamine-dicarboxylic acid.
- examples of such commercially available polyamide epoxy resins include “SUMIREZ RESIN 650” and “SUMIREZ RESIN 675” sold by Sumika Chemtex Co., Ltd.
- water-soluble epoxy resin it is preferable to mix other water-soluble resin such as polyvinyl alcohol resin in order to further improve the coating property and adhesiveness.
- Polyvinyl alcohol-based resins include partially saponified polyvinyl alcohol and fully saponified polyvinyl alcohol, strong lpoxyl group-modified polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, methylol group-modified polyvinyl alcohol, amino group-modified polyvinyl alcohol. It may be a modified polyvinyl alcohol resin such as alcohol.
- KL-318 trade name
- the epoxy resin and other water-soluble resins such as polyvinyl alcohol resin added as necessary are dissolved in water to form an adhesive solution.
- the water-soluble epoxy resin preferably has a concentration in the range of about 0.2 to 2 parts by weight per 100 parts by weight of water.
- the amount is preferably about 1 to 10 parts by weight, more preferably about 1 to 5 parts by weight per 100 parts by weight of water.
- suitable urethane resins include ionomer-type urethane resins, particularly polyester-based ionomer-type urethane resins.
- the ionomer type is one in which a small amount of an ionic component (hydrophilic component) is introduced into the urethane resin constituting the skeleton.
- Polyester ionomer type urethane resin is a urethane resin having a polyester skeleton, into which a small amount of ionic component (hydrophilic component) is introduced.
- Such an ionomer-type urethane resin is suitable as an aqueous adhesive because it is emulsified directly in water without using an emulsifier.
- polyester ionomer-type urethane resins include "Hydran AP-20" and “Hydran APX-101H” sold by Dainippon Ink and Chemicals, Inc. Available.
- an ionomer type urethane resin is used as an adhesive component, it is preferable to further add a crosslinking agent such as isocyanate.
- An isocyanate-based crosslinking agent is a compound having at least two isocyanato groups (_NCO) in the molecule. Examples thereof include 2,4-tolylene diisocyanate, phenolic diisocyanate, 4, monomers and oligomers such as nates and isophorone diisocyanate, and adducts obtained by reacting these compounds with polyols.
- examples of commercially available isocyanate-based crosslinking agents that can be suitably used include “Hydran Assist C-1” sold by Dainippon Ink and Chemicals, Inc.
- the concentration of the urethane resin is about 10 to 70% by weight, more preferably 20% by weight or more, and 50% from the viewpoint of viscosity and adhesiveness. It is preferable to use a dispersion dispersed in water so that the amount is less than or equal to% by weight.
- an isocyanate-based crosslinking agent is added, 5% of the isocyanate-based crosslinking agent is added to 100 parts by weight of the urethane resin. ⁇ 100 parts by weight so that the blending amount May be selected as appropriate.
- the composite polarizing plate of the present invention can be obtained by applying the adhesive as described above to the adhesive surface of the retardation film 20 and / or the polarizer 30 made of a polypropylene resin and bonding them together. . Prior to bonding, it is also effective to increase the wettability by subjecting the surface of the retardation film 20 made of polypropylene resin to an easy adhesion treatment such as a corona discharge treatment. Further, after the lamination, for example, a drying process is performed at a temperature of about 60 to 100 ° C. Further, after that, it is preferable to cure at a temperature slightly higher than room temperature, for example, at a temperature of about 30 to 50 ° C. for about 10 to 10 days, in order to further increase the adhesive strength.
- the solventless adhesive does not contain a significant amount of solvent, and generally comprises a curable compound that polymerizes by heating or irradiation with active energy rays, and a polymerization initiator. From the viewpoint of reactivity, those cured by cationic polymerization are preferred, and epoxy adhesives are particularly preferred. Therefore, in one preferable embodiment of the composite polarizing plate of the present invention, a retardation film made of a polypropylene resin and a polarizer are bonded with a solventless epoxy adhesive. This adhesive is more preferably cured by catalysis by heating or irradiation with active energy rays.
- an epoxy compound that does not contain an aromatic ring in the molecule is preferably used as the curable compound.
- An adhesive using an epoxy compound that does not contain an aromatic ring in the molecule is described in, for example, JP-A-2004-245925. Examples of such epoxy compounds that do not contain an aromatic ring include hydrides of aromatic epoxy compounds, alicyclic epoxy compounds, and aliphatic epoxy compounds.
- the curable epoxy compound used for adhesives usually has two or more epoxy groups in the molecule.
- the hydride of an aromatic epoxy compound will be described. This is obtained by selectively hydrogenating an aromatic epoxy compound to an aromatic ring under pressure in the presence of a catalyst.
- aromatic epoxy compounds include diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, and bisphenol S.
- Bisphenol-type epoxy compounds such as diglycidyl ether; phenol-no-polac epoxy resins, cresol nopolac epoxy resins, hydroxybenz-epoxy resins such as aldehyde phenol phenol nopolac epoxy resins;
- polyfunctional epoxy compounds such as terrestrial tetrahydroxybenzophenone glycidyl ether and epoxidized polyvinyl phenol.
- hydrogenated bisphenol A diglycidyl ether is preferred.
- m represents an integer of 2 to 5.
- a compound in which one or more hydrogen atoms in (CH 2 ) m in this formula are removed and bonded to another chemical structure can be an alicyclic epoxy compound.
- the hydrogen forming the alicyclic ring may be appropriately replaced with a linear alkyl group such as a methyl group or an ethyl group.
- Specific examples of the alicyclic epoxy compound include the following.
- the polyhydric alcohol of the aliphatic polyhydric alcohol or its alkylene oxide adduct corresponds to this.
- Examples include 1,4 monobutanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, polyethylene dallicol diglycidyl ether.
- alkylene oxides ethylene oxide or polypropylene oxide
- aliphatic polyhydric alcohols such as diglycidyl ether of polypropylene dallicol, X-tylene glycol, polypropylene glycol, glycerin Polypolyglycidyl ester obtained by the above method.
- the epoxy compounds exemplified here may be used alone or in combination with a plurality of epoxy compounds.
- the epoxy equivalent of the epoxy compound used for the solventless adhesive is usually in the range of 30 to 3,000 g / equivalent, preferably 50 to 1,500 gZ equivalent. If the epoxy equivalent is less than 30 gZ equivalent, the flexibility of the cured protective film will decrease, Adhesive strength may decrease. On the other hand, if it exceeds 3,00 0 g Z equivalent, the compatibility with other components may decrease.
- a cationic polymerization initiator In order to cure the epoxy compound by cationic polymerization, a cationic polymerization initiator is blended.
- the cationic polymerization initiator generates a cationic species or a Lewis acid by irradiation with active energy rays such as visible light, ultraviolet light, X-rays, electron beams, or heating, and initiates a polymerization reaction of epoxy groups.
- active energy rays such as visible light, ultraviolet light, X-rays, electron beams, or heating
- the light power thione polymerization initiator enables curing at room temperature, reduces the need for consideration of the heat resistance of the polarizer or distortion due to expansion, and allows the retardation film and the polarizer to adhere well. it can.
- the light-power thione polymerization initiator acts catalytically by light, it is excellent in storage stability and workability even when mixed with an epoxy compound.
- Examples of compounds that generate cationic species and Lewis acids upon irradiation with active energy rays include aromatic diazonium salts, onion salts such as aromatic odonium salts and aromatic sulfonium salts, and iron-allene complexes.
- aromatic sulfonium salts in particular, have ultraviolet absorption characteristics even in a wavelength region of 300 nm or more, and thus provide a cured product having excellent curability and good mechanical strength and adhesive strength. Therefore, it is preferably used.
- photo-thion polymerization initiators can be easily obtained as commercial products.
- “Carad PCI-220” and “Carad PCI-620” above, Nippon Kayaku Co., Ltd.
- "UVI-6990” manufactured by Union Carbide
- "Adekaoptoma SP-150 ' ⁇ ” Adekaoptomer SP-170 (above, made by AD E KA),” CI-5102 "," CIT- 1370 ",
- the compounding amount of the light power thione polymerization initiator is usually 0.5 to 20 parts by weight, preferably 1 part by weight or more, and preferably 15 parts by weight or less with respect to 100 parts by weight of the epoxy compound. It is.
- a photosensitizer can be used in combination as necessary.
- a photosensitizer By using a photosensitizer, the reactivity is improved, and the mechanical strength and adhesive strength of the cured product can be improved.
- photosensitizers include carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo and diazo compounds, octalogen compounds, and photoreductive dyes.
- the photosensitizer is blended, the amount thereof is about 0.1 to 20 parts by weight, with the light power thione polymerizable epoxy resin composition being 100 parts by weight.
- thermal cationic polymerization initiator Benzylsulfonium salt, thiophenium salt, thiolanium salt, benzylammonium salt, pyridinium salt, hydrazinium salt, carboxylic acid ester, sulfonic acid ester, amide amide, etc. as compounds that generate cationic species or Lewis acid upon heating I can do it.
- thermal cationic polymerization initiators can also be obtained as commercial products.
- both of them are “Adeka Opton CP77” and “Adeka Opton CP66” (above, manufactured by AD E KA), “CI” -2639 “and” CI- 2624 "(Nippon Soda Co., Ltd.),” Sun-Aid SI-60L ",
- the epoxy adhesive may further contain a compound that promotes cationic polymerization, such as oxetanes and polyols.
- the adhesive is made from polypropylene resin. It can apply
- coat there is no particular limitation on the method of applying the solventless adhesive to the retardation film or the polarizer.
- a coating method can be used.
- each coating method has an optimum viscosity range, the viscosity may be adjusted using a small amount of solvent.
- the solvent used for this purpose may be any solvent that can dissolve the epoxy adhesive well without degrading the optical performance of the polarizer.
- the thickness of the adhesive layer is usually 50 m or less, preferably 20 m or less, more preferably 10 m or less, and usually 1 m or more. is there.
- the epoxy adhesive layer is formed by irradiating active energy rays or heating. Curing and fixing the retardation film on the polarizer.
- ultraviolet rays are preferably used. Specific UV light sources include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, black light lamps, and metal halide lamps. The irradiation intensity and irradiation amount of active energy rays or ultraviolet rays are sufficient to activate the polymerization initiator sufficiently so as not to adversely affect the adhesive layer, polarizer, retardation film and transparent protective layer after hardening.
- the selection may be made as appropriate.
- it can be heated by a generally known method, and the temperature and time at that time sufficiently activate the polymerization initiator, and the cured adhesive layer or polarizer
- the retardation film and the transparent protective layer may be appropriately selected so as not to adversely affect the retardation film and the transparent protective layer.
- the composite polarizing plate 10 configured as described above is provided with a pressure-sensitive adhesive (adhesive) on the outside of the retardation film 20 so that it can be bonded to a liquid crystal cell. be able to.
- the composite polarizing plate is laminated on at least one side of the liquid crystal cell to constitute a liquid crystal display device.
- the composite polarizing plate can be disposed on both sides of the liquid crystal cell, the composite polarizing plate can be disposed on one side of the liquid crystal cell, and another polarizing plate can be disposed on the other side.
- the retardation film 20 side is disposed so as to face the liquid crystal cell.
- FIG. 2 is a schematic perspective view showing an example in which the composite polarizing plate of the present invention is arranged on both surfaces of the liquid crystal cell. Also in this example, the layers are shown separated from each other, but in actuality, adjacent layers are in close contact.
- a composite polarizing plate composed of a retardation film 20 Z polarizer 30 / protective layer 40 is provided below the liquid crystal cell 50, and the retardation film 20 side is disposed on the liquid crystal cell 50.
- the composite polarizing plate composed of the retardation film 20 / polarizer 30 / protective layer 40 is also placed on the upper side of the liquid crystal cell 50, and the retardation film 20 side is placed on the liquid crystal cell 50. They are stacked to face each other.
- each composite polarizing plate the slow axis 22 of the retardation film 20 and the absorption axis 32 of the polarizer 30 are orthogonal to each other, and the lower polarizer 30 has its absorption axis.
- 3 2 is orthogonal to the long side direction 52 of the liquid crystal cell 50, and the upper polarizer 30 has its absorption axis 32 parallel to the long side direction 52 of the liquid crystal cell 50.
- a backlight is disposed outside any one of the protective films 40 to form a liquid crystal display device. This configuration is particularly effective when the liquid crystal cell is in the vertical alignment mode.
- Another aqueous adhesive was prepared with the following composition. This is a urethane adhesive.
- Alon Alpha a cyanoacrylate instant adhesive sold by Konishi Co., Ltd., was used as another adhesive.
- a solvent-free epoxy-based ultraviolet curable adhesive containing an alicyclic epoxy compound and a light power thione polymerization initiator was used.
- the surface was subjected to corona discharge treatment.
- this composite polarizing plate is 1 2 2 xm, and it can be made thinner than a polarizing plate in which a protective layer composed of a 80 / m-thick triacetyl cell film is bonded to both sides of the polarizer. did it. If a film with a thickness of 40 m is used as one triacetyl cell inlet film, the thickness of the composite polarizing plate can be reduced to 8 2.
- Example 1 shows a corona discharge treated surface of this retardation film on one side of a polyvinyl alcohol Z-iodine polarizer and a saponified triacetyl cellulose film on the other side of the polarizer. Then, it was bonded with an aqueous epoxy adhesive, then dried at 80 ° C. for 5 minutes, and further cured at 40 ° C. for about 60 hours to prepare a composite polarizing plate. At this time, the polarizer was arranged so that the absorption axis of the polarizer and the slow axis of the phase difference film were orthogonal to each other.
- the right direction of the screen is set to 0 degrees
- the azimuth angle is displayed with the counterclockwise direction set to positive (numbers are displayed every 45 degrees from 0 degrees to 3 15 degrees)
- the horizontal axis "1 0", "2 0", ... "8 0" are from the normal at each azimuth.
- the right edge of a circle means the contrast in the direction with an azimuth angle of 0 degrees and an inclination of nearly 90 degrees from the normal
- the center of the circle means the inclination of 0 degrees, that is, the contrast in the normal direction of the screen. Contrast is the ratio of the brightness at white display (voltage applied to the liquid crystal cell) to the brightness at black display (no voltage applied to the liquid crystal cell).
- the composite polarizing plate of the present invention has little dimensional change due to temperature change and the like, and is excellent in dimensional stability. Further, since a film made of polypropylene resin is employed as the retardation film constituting the film, a desired retardation value can be expressed with a small thickness. Furthermore, for the adhesion between the retardation film made of polypropylene resin and the polarizer, for example, a known adhesive having an epoxy resin, urethane resin, or the like as a component can be used. can get. In addition, because the retardation film is made of general-purpose polypropylene resin, the cost can be significantly reduced compared to the retardation film specified for conventional optical applications. Can be mentioned.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/298,593 US20090066888A1 (en) | 2006-04-28 | 2007-04-24 | Composite polarizing plate and liquid crystal display using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006125008 | 2006-04-28 | ||
JP2006-125008 | 2006-04-28 |
Publications (1)
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WO2007126108A1 true WO2007126108A1 (ja) | 2007-11-08 |
Family
ID=38655628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/059347 WO2007126108A1 (ja) | 2006-04-28 | 2007-04-24 | 複合偏光板及びそれを用いた液晶表示装置 |
Country Status (5)
Country | Link |
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US (1) | US20090066888A1 (ja) |
KR (1) | KR20090027189A (ja) |
CN (1) | CN101432643A (ja) |
TW (1) | TWI449970B (ja) |
WO (1) | WO2007126108A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI490609B (zh) * | 2008-03-05 | 2015-07-01 | Sumitomo Chemical Co | A retardation film with an adhesive layer, and an elliptically polarizing plate and a liquid crystal display device using the same |
CN105527708A (zh) * | 2014-10-15 | 2016-04-27 | 现代摩比斯株式会社 | 防尘罩组件及具备此的抬头显示装置 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20070061529A (ko) * | 2004-09-02 | 2007-06-13 | 후지필름 가부시키가이샤 | 투명 폴리머 필름, 그리고, 그것을 사용한 광학 보상 필름,편광판 및 액정 표시 장치 |
JP2009265624A (ja) * | 2008-03-31 | 2009-11-12 | Fujifilm Corp | 光学フィルム、偏光板、及び液晶表示装置 |
KR100953265B1 (ko) * | 2008-06-12 | 2010-04-16 | 주식회사 화승인더스트리 | 영(0)의 파장 분산성을 가지면서도 면내 위상차 값이균일한 위상차 필름 및 양(+)의 파장 분산성을 가지는 적층광학 필름 |
TWI440940B (zh) * | 2010-09-30 | 2014-06-11 | Hannstar Display Corp | 液晶顯示裝置 |
JP2012103488A (ja) * | 2010-11-10 | 2012-05-31 | Dainippon Printing Co Ltd | 光学フィルムの製造方法 |
TWI611933B (zh) * | 2011-09-15 | 2018-01-21 | Nitto Denko Corp | 具有接著劑層之影像顯示裝置用單元及使用該單元的影像顯示裝置 |
JP5949123B2 (ja) * | 2012-05-11 | 2016-07-06 | 住友化学株式会社 | 偏光板 |
CN103605176A (zh) * | 2013-09-17 | 2014-02-26 | 京东方科技集团股份有限公司 | 相位差膜及其制造方法和显示设备 |
JP6249820B2 (ja) * | 2014-02-27 | 2017-12-20 | 住友化学株式会社 | 偏光板の製造方法及び偏光板 |
JP6664912B2 (ja) * | 2014-09-19 | 2020-03-13 | 日東電工株式会社 | 偏光板 |
KR102041740B1 (ko) * | 2015-11-05 | 2019-11-06 | 코니카 미놀타 가부시키가이샤 | 광학 필름, 편광판 및 화상 표시 장치 |
JP2019125423A (ja) * | 2018-01-12 | 2019-07-25 | 株式会社Joled | 表示装置 |
KR20210117391A (ko) * | 2020-03-18 | 2021-09-29 | 삼성디스플레이 주식회사 | 표시 장치 |
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- 2007-04-24 US US12/298,593 patent/US20090066888A1/en not_active Abandoned
- 2007-04-24 KR KR1020087027232A patent/KR20090027189A/ko not_active Application Discontinuation
- 2007-04-24 WO PCT/JP2007/059347 patent/WO2007126108A1/ja active Application Filing
- 2007-04-25 TW TW096114629A patent/TWI449970B/zh not_active IP Right Cessation
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TWI490609B (zh) * | 2008-03-05 | 2015-07-01 | Sumitomo Chemical Co | A retardation film with an adhesive layer, and an elliptically polarizing plate and a liquid crystal display device using the same |
CN105527708A (zh) * | 2014-10-15 | 2016-04-27 | 现代摩比斯株式会社 | 防尘罩组件及具备此的抬头显示装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20090027189A (ko) | 2009-03-16 |
TWI449970B (zh) | 2014-08-21 |
US20090066888A1 (en) | 2009-03-12 |
TW200813497A (en) | 2008-03-16 |
CN101432643A (zh) | 2009-05-13 |
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