KR20140146921A - Optical film having anti-wavelength dispersibility, polarizing plate comprising the same - Google Patents
Optical film having anti-wavelength dispersibility, polarizing plate comprising the same Download PDFInfo
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- KR20140146921A KR20140146921A KR20130069897A KR20130069897A KR20140146921A KR 20140146921 A KR20140146921 A KR 20140146921A KR 20130069897 A KR20130069897 A KR 20130069897A KR 20130069897 A KR20130069897 A KR 20130069897A KR 20140146921 A KR20140146921 A KR 20140146921A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10715—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing polyether
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2327/00—Polyvinylhalogenides
- B32B2327/12—Polyvinylhalogenides containing fluorine
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
Abstract
The present invention relates to a polyester resin having a fluorene skeleton in its main chain; And a resin containing an aromatic ring or an aliphatic ring in its main chain, wherein a retardation value in a plane direction represented by the following formula (1) is from 30 to 200 nm at a wavelength of 550 nm and a retardation To an optical film and a polarizing plate comprising the optical film.
Equation (1) R in = (n x -n y ) xd
(Where n x is the refractive index in the direction in which the refractive index is the largest in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, d is the thickness being)
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical film having an inverse wavelength dispersion property and a polarizing plate including the polarizing plate, and more particularly, to an optical film having an inverse wavelength dispersion property which can be applied to an organic light emitting diode, an IPS mode liquid crystal display, And a polarizing plate comprising the optical film.
BACKGROUND ART [0002] In a display device such as a liquid crystal display (LCD) or an organic light emitting diode (OLED), a retardation film is used for the purpose of improving the viewing angle, improving the display quality or preventing reflection, Dispersibility, flat wavelength dispersibility, and reverse wavelength dispersibility. The retardation film having the regular wavelength dispersion means a retardation film having a characteristic that a retardation value generated as the wavelength of incident light becomes smaller, and a retardation film having a flat wavelength dispersion property has a similar degree regardless of the wavelength of incident light And a retardation film having a reverse wavelength dispersion property means a retardation film having a characteristic that a retardation value generated as the wavelength of incident light increases.
On the other hand, a retardation film having a flat wavelength dispersibility or a retardation film having a regular wavelength dispersion has a problem that the color tone is different depending on the viewing direction because the transmittance becomes non-uniform as the wavelength increases. Therefore, applicability to an organic light emitting device, an IPS mode liquid crystal display device, a VA mode liquid crystal display device and the like which require a phase difference film with little change in color and sensation is lowered. However, in the case of a retardation film having a reverse wavelength dispersion property, there is no such problem because the transmittance becomes uniform.
On the other hand, in the case of a liquid crystal display device, since two polarizing plates are used with different optical axes from each other, light passing through the upper polarizing plate when the power is turned off becomes polarized light that vibrates only in one direction, and the polarized light passes through another lower polarizing plate It is the principle that black is realized because it can not do. On the other hand, since only one polarizing plate is used for an organic light emitting device, a black screen can not be realized on the same principle as a liquid crystal display device. Therefore, in an organic light emitting device, a black screen is required to be realized with only one polarizer. For this purpose, a 1/4 wavelength retardation film is required. That is, when the 1/4 wavelength retardation film is adhered directly below the polarizing plate for organic light emitting devices, the light that has passed through the polarizing plate and the 1/4 wavelength retardation film becomes circularly polarized light. Then, when the 1/4 wavelength retardation film is reflected by the reflection plate, Since the circularly polarized light is rotated in the opposite direction, the incoming light and the outgoing light are orthogonal to each other, thereby implementing a black screen. In this case, unlike the inverse wavelength dispersion, the range of the wavelength that can act as the 1/4 wavelength retardation film is limited to only a limited range in the case of the flat wavelength dispersion or the regular wavelength dispersion. In the case of the 1/4 wavelength retardation film, It is required to have acidity.
However, most of the retardation films developed to date have either normal wavelength dispersion or flat wavelength dispersion. In addition, since the wavelength dispersibility is a characteristic inherent to the material of the retardation film, a new raw material must be found in order to produce a retardation film having a reversed wavelength dispersibility in a single sheet, A retardation film having an opposite wavelength dispersion property may be prepared by laminating two or more retardation films having different wavelength dispersibility by using an adhesive or an adhesive or by co-extruding a resin having a positive retardation value and a resin having a negative retardation value, And a method of producing a retardation film having an opposite wavelength dispersibility by stretching it.
However, in the case of the first method, if the optical axes of the two retardation films to be laminated are not precisely arranged, there is a problem that the reverse wavelength dispersion is not exhibited and the manufacture is very difficult. In the second method, If the glass transition temperature is not the same, stretching does not occur properly, and there is a problem that the usable resin is limited.
DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an organic light emitting device, an IPS mode liquid crystal display device, a VA mode An optical film applicable as a retardation film to a liquid crystal display device, and a polarizing plate including the optical film.
In one aspect, the present invention relates to a polyester resin having a fluorene skeleton in its main chain; And a resin containing an aromatic ring or an aliphatic ring in its main chain, wherein a retardation value in a plane direction represented by the following formula (1) is from 30 to 200 nm at a wavelength of 550 nm and a retardation ≪ / RTI > provide optical films.
Equation (1) R in = (n x -n y ) xd
(Where n x is the refractive index in the direction in which the refractive index is the largest in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, d is the thickness being)
In another aspect, the present invention provides a polarizing plate comprising the optical film.
In another aspect, the present invention provides a display device comprising the optical film.
Since the optical film of the present invention can realize a reverse wavelength dispersion property in which the phase difference is reduced as the wavelength is effectively reduced even when a single film is used, the optical film can be manufactured in a thin shape and is easy to manufacture, It can be applied as a retardation film to various display devices such as a liquid crystal display device and a VA mode liquid crystal display device.
Further, since the optical film of the present invention uses a blend resin including a resin containing an aromatic ring or an aliphatic ring in the main chain, an optical film produced using only a polyester-based resin having a fluorene skeleton in its main chain May have a desired in-plane retardation value even if it is stretched at a temperature higher than the glass transition temperature.
Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.
The inventors of the present invention have conducted intensive studies to solve the above problems and found that a compounding resin containing a polyester resin having a fluorene skeleton in its main chain and a resin containing an aromatic ring or aliphatic ring in its main chain is used for optical In the case of producing a film, it is possible to obtain an optical film having a wavelength dispersibility, that is, an inverse wavelength dispersibility, in which the in-plane retardation value becomes smaller as the wavelength of light becomes shorter. Further, even if stretching at a high temperature is performed, And have completed the present invention.
That is, the optical film of the present invention comprises a polyester resin having a fluorene skeleton in its main chain; And a resin containing an aromatic ring or an aliphatic ring in its main chain, wherein a retardation value in a plane direction represented by the following formula (1) is from 30 to 200 nm at a wavelength of 550 nm and a retardation It is characterized by having.
Equation (1) R in = (n x -n y ) xd
(Where n x is the refractive index in the direction in which the refractive index is the largest in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, d is the thickness being)
In the present invention, the polyester resin having a fluorene skeleton in the main chain in the present invention is intended to have the reverse wavelength dispersion property of the optical film of the present invention, but is not limited thereto. For example, a fluorene skeleton Or a polyester resin which is polymerized by esterification using a dicarboxylic acid component as a derivative or an ester exchange method using a diol component having a fluorene skeleton in its main chain and a dicarboxylic acid diester component as a derivative Or a polyester-based resin that is polymerized by a polymerization initiator.
In the present invention, examples of the diol component having a fluorene skeleton in the main chain include, but are not limited to, 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene, Methylphenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3,5-dimethylphenyl] fluorene, 9- , 9-bis [4- (2-hydroxyethoxy) -3-ethylphenyl] fluorene, (2-hydroxyethoxy) -3-isopropylphenyl] fluorene, 9,9-bis [4- Fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3,5-diisopropylphenyl] fluorene, bis [4- (2-hydroxyethoxy) -3,5-di-n-butylphenyl] fluorene, 9,9- -Hydroxyethoxy) -3-isobutylphenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3,5-diisobutyl Phenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3- Phenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) - (2-hydroxyethoxy) -3,5-diphenylphenyl] fluorene, 9,9-bis [4- Bis [4- (2-hydroxyethoxy) -3,5-dibenzylphenyl] fluorene, 9,9-bis [4- (3- hydroxypropoxy) phenyl] fluorene, 9,9- [4- (4-hydroxybutoxy) phenyl] fluorene, and the like. These fluorene diol components may be used alone or in combination of two or more.
In the present invention, the dicarboxylic acid component or the dicarboxylic acid diester component is not particularly limited, and general polyester resin raw materials can be used. For example, aliphatic dicarboxylic acid, alicyclic dicarboxylic acid, aromatic dicarboxylic acid and diesters thereof may be used alone or in admixture of two or more. In addition, an acid anhydride capable of forming an ester , Acid halide, etc. can also be used.
In the present invention, it is more preferable that the polyester resin having a fluorene skeleton in the main chain has a unit represented by the following formula (1).
[Chemical Formula 1]
(In the above Formula 1, ring A 1 and A 2 independently represent an aromatic hydrocarbon ring; ring B represents an aliphatic hydrocarbon ring or aromatic hydrocarbon ring; R 1 is C 2 -6 alkylene group; R 2a and R 2b are independently a C 1 -6 alkyl group, a C 5 -6 cycloalkyl group, C 6 -10 aryl groups, C 7 -14 arylalkyl group, C 1 -6 alkoxy, C 5 -10 cycloalkoxy group, C 6 -10 aryloxy group, C 7 -14 aryl alkyloxy, C 1 -6 acyl, C 1 -4 alkoxycarbonyl group, a halogen atom, A nitro group, a cyano group or an amino group; R 3a and R 3b independently represent C 1 -6 alkyl, C 1 -6 alkoxy group, a halogen atom, a group, a cyano group or a nitro group; R 4 represents a halogen atom or a C 1 -6 alkyl group; h is an integer of 0 or 1; i1, i2, j1, j2 and k are independently an integer of 0 to 4)
In the ring A 1 and A 2 in the general formula (1), the aromatic hydrocarbon ring is, C 6, such as benzene ring, naphthalene ring, anthracene ring - 14 aromatic hydrocarbon ring, and include the examples, among these more preferred benzene Whanin Do. At this time, in the rings A 1 and A 2 of the formula (1), the bonding position of the polyester resin with the main chain is not particularly limited.
In ring B of Formula 1, the aliphatic hydrocarbon ring is, cyclopentane ring, cyclohexane ring, such as a C 5 - 10 cycloalkane (cycloalkane) ring and cyclopentene ring, cyclohexene ring, and cyclooctene ring of C 5 - 10 cycloalkene ring, and the like; The aromatic hydrocarbon ring is a benzene ring, naphthalene ring, anthracene ring, C 6, such as biphenyl ring-14 can be given an aromatic hydrocarbon ring, such as Examples. The ring B is more preferably a C 5 - 10 cycloalkane ring such as a cyclopentane ring, a cyclohexane ring and the like. At this time, in the ring B of the formula (1), the bonding position of the polyester resin with the main chain is not particularly limited and may be an asymmetric position or a symmetric position. For example, when the ring B is a cyclohexane ring, the 1,3-carbon may be a cyclohexane ring bonded to the main chain, or a 1,4-cyclohexane ring may be bonded to the main chain.
In the above formula, but are not limited to, C 2 of R 1 - 6 alkylene group, may be mentioned an ethylene group, a propylene group, a trimethylene group, a tetramethylene group and the like. Examples.
In the above formula, but are not limited thereto, of R 2a and R 2b C 1 - 6 alkyl group a is a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a t- butyl group or the like that For example; Examples of the C 5 -6 cycloalkyl group include a cyclopentyl group, a cyclohexyl group and the like; C 6 -10 aryl group may be a phenyl group, a phenyl group, a 2-methylphenyl group, a dimethylphenyl group, a naphthyl group, etc. For example; To C 7-14 aryl alkyl group may include a benzyl group and the like. Examples; C 1 -6 alkoxy groups there may be mentioned a methoxy group, an ethoxy group, a propoxy group, butoxy group, isobutoxy group Messenger, t- butoxy group, etc. For example; Examples of the C 5 -10 cycloalkoxy group include a cyclohexanone group and the like; C 6 -10 aryloxy groups include phenoxy and the like. Examples; Examples of the C 7-14 arylalkyloxy group include a benzyloxy group and the like; Examples of the C 1 -6 acyl group include an acetyl group and the like; C 1 -4 alkoxycarbonyl groups include a methoxycarbonyl group, etc. Examples.
In the above formula, but are not limited thereto, C 1 of R 3a and R 3b - to a methyl group, ethyl-6 alkyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a t- butyl group For example; C 1 -6 alkoxy groups include a methoxy group, an ethoxy group, a propoxy group, butoxy group, isobutoxy group Messenger, t- butoxy group, etc. Examples.
In the above formula, but are not limited to, the R 4 C 1 - 6 alkyl group include a methyl group, ethyl shop, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a t- butyl group. Examples .
In the present invention, the rings A 1 and A 2 of the formula (1) are benzene rings; Ring B is a cyclohexane ring; R 1 is ethylene or propylene; R 2a and R 2b are independently a C 1 - 6 alkyl group; R 3a and R 3b independently represent C 1 - 6 alkyl group; R 4 is C 1 - 6 alkyl group; h is an integer of 0 or 1; It is more preferable that i1, i2, j1, j2 and k are independently an integer of 0 to 2. In this case, the optical film of the present invention can have a desired reverse wavelength dispersion property more effectively.
Next, in the present invention, the resin containing an aromatic ring or an aliphatic ring in the main chain is obtained by stretching the optical film of the present invention at a temperature higher than the glass transition temperature of the polyester resin having a fluorene skeleton in the main chain The resin having an aromatic ring or an aliphatic ring in the main chain may be, for example, but not limited to, a polycarbonate resin, a polyarylate resin, a polynaphthalene resin Based resins, polynorbornene-based resins, and the like.
In the present invention, it is more preferable that the resin containing an aromatic ring or an aliphatic ring in the main chain is a polycarbonate resin. Since the polycarbonate resin has a small refractive index difference with the polyester resin having a fluorene skeleton in the main chain and intermolecular interactions act uniformly, the polycarbonate resin is mixed more transparently when mixed with a resin containing a fluorene skeleton in the main chain This is because when the optical film is used, the film transparency of the optical film of the present invention is further improved.
In the present invention, it is preferable that the resin containing an aromatic ring or an aliphatic ring in the main chain is contained in 1 to 5 parts by weight in 100 parts by weight of the compounding resin, and in 100 parts by weight of the compounding resin , 2 to 4 parts by weight, or 3 to 4 parts by weight. When the above range is satisfied, the present invention can have desired in-plane retardation value and reverse wavelength dispersion property.
In the present invention, the compounding resin composition may be prepared by blending the film raw material with any suitable mixer such as an omni mixer, and then subjecting the resulting mixture to compression kneading. The mixer used in the extrusion kneading is not particularly limited. Any suitable mixer such as an extruder such as a single screw extruder, a twin screw extruder, a press kneader, or the like can be used.
In addition, the method of producing the optical film according to the present invention is not limited as long as it is well known in the art. For example, the optical film may be formed by a solution casting method (solution casting method), a melt extrusion method, And a suitable film forming method of the above. In the present invention, the solution casting method and the melt extrusion method are more preferable among these film forming methods. The solution casting method or the melt extrusion method is not particularly limited and may be carried out by a solution casting method or a melt extrusion method well known in the art. Examples of the melt extrusion method include a T-die method and an inflation method.
When the film is uniaxially or biaxially stretched, the film may be subjected to longitudinal (MD) stretching and transverse (TD) stretching, respectively. You can do both. In the case of stretching both in the longitudinal direction and the transverse direction, the stretching can be performed in the other direction after the stretching in either the first direction or the second stretching direction. The stretching can be performed in one step or in multiple steps. When stretching in the longitudinal direction, stretching can be performed by the speed difference between the rolls, and in the case of stretching in the transverse direction, tenter can be used. The time of railing of the tenter is usually within 10 degrees, suppressing the bowing phenomenon occurring in the transverse direction drawing, and controlling the angle of the optical axis regularly. It is also possible to obtain the same bowing suppression effect by setting the transverse stretching in multiple stages.
In the present invention, it is preferable that the stretching is uniaxially stretched at a ratio of at least 2 in the MD direction. If the stretching is performed in the TD direction, the refractive index in the y direction becomes large and the R in value becomes small. On the other hand, in general, uniaxial stretching only in the MD direction without stretching in the TD direction causes the polymer to be oriented only in the MD direction, resulting in splitting in the MD direction. However, in the present invention, the polyester having a fluorene backbone in the main chain Based resin is blended with a resin containing an aromatic ring or an aliphatic ring in the main chain, the resin composition itself is very elastic and does not break in the MD direction.
When the glass transition temperature of the polyester resin having a fluorene skeleton in the main chain is Tg (占 폚), the stretching is preferably carried out at a high temperature of Tg or more, and Tg to (Tg + 20 占 폚) or Tg To (Tg + 10 DEG C). When the stretching is performed at a temperature lower than the glass transition temperature of the polyester-based resin having a fluorene skeleton in the main chain, if the optical film to be produced is applied to a display, the phase difference is changed by heat generated in the panel of the display This can happen. On the other hand, the glass transition temperature can be measured by a differential scanning calorimeter (DSC). For example, in the case of using a differential scanning calorimeter (DSC), when a sample of about 10 mg is sealed in a special pen and heated at a constant temperature, the endothermic heat and the heat generation amount of the material due to the phase change occur, The transition temperature can be measured.
The stretching speed is preferably in the range of 1 to 100 mm / min in the case of a universal testing machine (Zwick Z010) and in the range of 0.1 to 2 m / min in the case of pilot drawing equipment And stretching the film by applying an elongation of 5 to 300%.
On the other hand, in order to stabilize the optical isotropy and mechanical properties of the optical film of the present invention, heat treatment (annealing) after stretching treatment and the like can be performed. The heat treatment conditions are not particularly limited, and any suitable conditions known to those skilled in the art can be employed.
The optical film of the present invention produced by the above method preferably has an in-plane retardation value represented by the following formula (1) of 30 to 200 nm at a wavelength of 550 nm measured in terms of a film thickness of 50 m, To 150 nm or 50 to 150 nm or 130 to 150 nm. When the in-plane retardation value is within the above range at a wavelength of 550 nm, the optical film of the present invention can be applied to a VA mode liquid crystal display device, an IPS mode liquid crystal display device or the like as a retardation film, The device can be also applied as a 1/4 wavelength retardation film.
Equation (1) R in = (n x -n y ) xd
(Where n x is the refractive index in the direction in which the refractive index is the largest in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, d is the thickness being)
Further, the thickness direction retardation value represented by the following formula (2) is preferably -120 nm to 120 nm at a wavelength of 550 nm measured in terms of a film thickness of 50 mu m, And more preferably -20 to 60 nm. When the retardation value in the thickness direction at a wavelength of 550 nm is within the above range, the optical film of the present invention can be applied to a VA mode liquid crystal display device, an IPS mode liquid crystal display device, an organic light emitting device or the like as a retardation film, The retardation value in the thickness direction is required to be small. When the retardation value in the thickness direction at the wavelength of 550 nm is within the above range, the retardation value in the thickness direction is sufficiently small, No problem occurs.
Equation (2) R th = (n z -n y ) xd
(Where n x is the refractive index in the direction with the largest refractive index in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, and n z is the refractive index in the thickness direction And d is the thickness of the film)
The optical film of the present invention produced by the above-described method has an inverse wavelength dispersibility that the retardation increases as the wavelength increases. In this case, the optical film of the present invention has a ratio R in (450) of the in- plane retardation value R in (450) at a wavelength of 450 nm to the in-plane retardation value R in (550) at a wavelength of 550 nm measured in terms of a film thickness of 50 μm (450) / R in (550) is preferably 0.5 or more and less than 1.0, more preferably 0.75 to 0.95 or 0.80 to 0.95. In the optical film of the present invention, the ratio R in ( in ) of the in- plane retardation value R in (650) at a wavelength of 650 nm to the in-plane retardation value R in (550) at a wavelength of 550 nm measured in terms of a film thickness of 50 μm (650) / R in (550) is preferably more than 1.0 but not more than 1.3, more preferably 1.01 to 1.20 or 1.01 to 1.18. R in (450) / R in (550) and R in (650) / R in (550) may have have a wavelength dispersible reverse wavelength dispersion optical film is desired in the present invention if they meet the above numerical value range, In particular, when the optical film of the present invention is used as a 1/4 wavelength retardation film, a very excellent black screen can be realized in a state where the power is turned off.
In addition, the thickness of the optical film of the present invention manufactured by the above method may be in the range of 10 to 100 탆, more preferably 10 to 70 탆 or 10 to 50 탆. At this time, the thickness of the optical film means the final thickness after stretching. When the thickness of the optical film is within the above-mentioned numerical range, it is possible to obtain a thin film and desired circular polarization characteristics, and it is possible to reduce the size and weight of the display device including the optical film.
Meanwhile, the optical film according to the present invention may be included in a polarizing plate as a retardation film. For example, the optical film may be included in a polarizing plate as a retardation film for an IPS mode liquid crystal display device or a retardation film for a VA mode liquid crystal display device. In this case, the optical film according to the present invention may be directly attached to one side or both sides of the polarizer, or may be attached to a protective film of a conventional polarizer having a protective film attached on both sides of the polarizer, and may be usefully used as a retardation film.
When the optical film is directly attached to one side or both sides of the polarizer as a retardation film, for example, the structure may be an upper protective film / polarizer / retardation film or a retardation film / polarizer / lower protective film. The surface of the retardation film or the polarizer may be coated with a primer by using a roller coater, a gravure coater, a bar coater, a knife coater, a capillary coater, a micro chamber doctor blade coater or the like , A method of sprinkling an adhesive agent in a dripping manner, a method of heating and laminating a laminate including a retardation film and a polarizer by a roll of a paper roll, a method of laminating by laminating at room temperature, or a method of UV curing.
For example, in the case where a retardation film is directly attached to one surface or both surfaces of a polarizer using an aqueous adhesive, a surface of a retardation film is coated with a primer of polyurethane diamine type by a bar coater method, A method of sprinkling an adhesive between the polarizers by a dripping method and heating the laminate of the retardation film and the polarizer with a joint roll or by pressing at room temperature and laminating.
When a retardation film is directly adhered to one surface or both surfaces of a polarizer using a UV curable adhesive, a primer is coated on the surface of the retardation film by a micro chamber doctor blade coater, and then an adhesive is applied between the retardation film and the polarizer by a dropping method Spraying, sprinkling, lapping, and UV curing.
On the other hand, the optical film according to the present invention can effectively perform inverse wavelength dispersion even with a single film, satisfies 1/4 wavelength, and does not significantly change color and luminosity, and as a retardation film for an organic light emitting element Can be used. More specifically, the optical film of the present invention may be included as a 1/4 wavelength retardation film in a polarizing plate for an OLED, which is required to change linearly polarized light to circularly polarized light.
Meanwhile, the optical film according to the present invention can be included in various display devices. For example, the optical film may be applied as a retardation film to various display devices such as a liquid crystal display (LCD) and an organic light emitting diode (OLED) as described above.
Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the invention by the following examples.
Example One
96 parts by weight of a polyester resin OKP4 (Osaka Gas Chemical Co., Ltd.) having a fluorene skeleton having a glass transition temperature of 120 DEG C and 4 parts by weight of a polycarbonate resin (product of LG Chemical Co., Ltd.) were uniformly mixed, The composition was fed from a hopper to an extruder into a 24-psi extruder, which was purged with nitrogen, and melted at 240 캜 to prepare a raw material pellet.
The raw pellets were vacuum dried, melted in an extruder at 240 ° C, passed through a T-die of a coat hanger type, passed through a chrome casting roll and a drying roll, .
The film was uniaxially stretched at a rate of twice in the MD direction at 120 DEG C using a universal testing machine (Zwick Z010). The retardation and the wavelength dispersion of the film were measured in an Axoscan equipment of Axometrics and are shown in Table 1 below.
Example 2
Except that 96 parts by weight of a polyester resin OKP4V2 (product of Osaka Gas Chemical Co., Ltd.) having a fluorene skeleton in the main chain having a glass transition temperature of 132 占 폚 was used instead of OKP4 resin in Example 1 and the stretching condition was set at 137 占 폚 Were prepared in the same manner. The retardation and the wavelength dispersion of the film were measured in an Axoscan equipment of Axometrics and are shown in Table 1 below.
Comparative Example One
A polyester resin OKP4 (manufactured by Osaka Gas Chemicals Co., Ltd.) having a fluorene skeleton in its main chain having a glass transition temperature of 120 ° C was used in the same manner as in Example 1 except that the polycarbonate resin was not mixed in the same manner The film fabric was prepared, and then stretched in the MD direction at 130 ° C to obtain a retardation and a wavelength dispersion, which were measured in an Axoscan equipment of Axometrics, and are shown in Table 1 below.
Comparative Example 2
A polyester resin OKP4V2 (manufactured by Osaka Gas Chemicals Co., Ltd.) having a fluorene skeleton in its main chain having a glass transition temperature of 132 占 폚 was used in the same manner as in Example 2 except that the polycarbonate resin was not mixed in the same manner The film fabric was prepared, and then stretched in the MD direction at 142 ° C to obtain a retardation and a wavelength dispersion. The results are shown in Table 1 below using an Axoscan's Axoscan equipment.
As can be seen from Table 1, Examples 1 and 2 when the plane direction retardation value at a wavelength of 30 to 200㎚ 550㎚ is within the range of values of (R in), the thickness retardation value of the value (R th) There are -120 to get a retardation value desired by 120㎚, R in (450) / R th (550) is in the range of less than 0.5 or 1.0, R in (650) / R th (550) is greater than 1.0 And may have reverse wavelength dispersion characteristics within a range of 1.3 or less.
However, in the case of Comparative Example 1, the retardation values measured in terms of 50 m are R in = 11 nm, R th = 0 nm, R (450) / R (550) = 0.29, R (650) = 1.29. In case of wavelength dispersion, a very large reverse wavelength dispersion can be obtained. However, R in is insufficient for application to retardation films for organic light emitting devices and the like.
Similarly, in the case of Comparative Example 2, the retardation values measured in terms of 50 mu m were R in = 25 nm, R th = -2 nm, R (450) / R (550) = 0.71, R 550) = 1.12. In case of wavelength dispersion, a very large reverse wavelength dispersion can be obtained, but R in is insufficient for application as a phase difference film for an organic light emitting device.
As described above, the optical film of the present invention can realize an inverse wavelength dispersion in which the phase difference is reduced as the wavelength is effectively reduced even in a single film, so that the optical film can be manufactured in a thin shape, , An IPS mode liquid crystal display device, a VA mode liquid crystal display device, and the like. Further, it can be produced by stretching at a temperature higher than the glass transition temperature of a polyester resin having a fluorene skeleton in the main chain In-plane retardation value can be obtained.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.
Claims (15)
A compounding resin comprising a resin containing an aromatic ring or an aliphatic ring in the main chain,
And the plane direction retardation value represented by the following formula (1) at a wavelength of 30 to 550㎚ 200㎚, reverse wavelength optical film having an acid.
Equation (1) R in = (n x -n y ) xd
(Where n x is the refractive index in the direction in which the refractive index is the largest in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, d is the thickness being)
Wherein the optical film has a retardation value in the thickness direction of -120 to 120 nm represented by the following formula (2) at a wavelength of 550 nm.
Equation (2) R th = (n z -n y ) xd
(Where n x is the refractive index in the direction with the largest refractive index in the plane direction of the film, n y is the refractive index in the vertical direction in the n x direction in the plane direction of the film, and n z is the refractive index in the thickness direction And d is the thickness of the film)
The optical film has a ratio R in (450) / R (450) of the in- plane retardation value R in (450) at a wavelength of 450 nm to the in-plane retardation value R in (550) and in (550) is less than 1.0 more than 0.5, the ratio of in-plane retardation value at a wavelength 650㎚ for the in-plane retardation value at a wavelength 550㎚ measured in terms of the film thickness 50㎛ R in (550) R in (650) Wherein R in (650) / R in (550) is more than 1.0 but not more than 1.3.
Wherein the resin containing an aromatic ring or an aliphatic ring in the main chain is contained in an amount of 1 to 5 parts by weight in 100 parts by weight of the compounding resin.
Wherein the polyester resin having a fluorene skeleton in the main chain comprises a unit represented by the following formula (1).
[Chemical Formula 1]
(In the above Formula 1, ring A 1 and A 2 independently represent an aromatic hydrocarbon ring; ring B represents an aliphatic hydrocarbon ring or aromatic hydrocarbon ring; R 1 is C 2 -6 alkylene group; R 2a and R 2b are independently a C 1 -6 alkyl group, a C 5 -6 cycloalkyl group, C 6 -10 aryl groups, C 7 -14 arylalkyl group, C 1 -6 alkoxy, C 5 -10 cycloalkoxy group, C 6 -10 aryloxy group, C 7 -14 aryl alkyloxy, C 1 -6 acyl, C 1 -4 alkoxycarbonyl group, a halogen atom, A nitro group, a cyano group or an amino group; R 3a and R 3b independently represent C 1 -6 alkyl, C 1 -6 alkoxy group, a halogen atom, a group, a cyano group or a nitro group; R 4 represents a halogen atom or a C 1 -6 alkyl group; h is an integer of 0 or 1; i1, i2, j1, j2 and k are independently an integer of 0 to 4)
The rings A 1 and A 2 in the above formula (1) are benzene rings; Ring B is a cyclohexane ring; R 1 is ethylene or propylene; R 2a and R 2b are independently a C 1 - 6 alkyl group; R 3a and R 3b independently represent C 1 - 6 alkyl group; R 4 is C 1 - 6 alkyl group; h is an integer of 0 or 1; i1, i2, j1, j2, and k are independently an integer of 0 to 2.
Wherein the resin containing an aromatic ring or an aliphatic ring in the main chain is at least one selected from the group consisting of a polycarbonate resin, a polyarylate resin, a polynaphthalene resin and a polynorbornene resin.
Wherein the resin containing an aromatic ring or an aliphatic ring in the main chain is a polycarbonate resin.
Wherein the optical film has a thickness of 10 to 100 占 퐉.
Wherein the optical film is a retardation film for an organic light emitting device.
Wherein the optical film is a 1/4 wavelength retardation film.
Wherein the optical film is a retardation film for a VA mode liquid crystal display.
Wherein the optical film is a retardation film for an IPS mode liquid crystal display.
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| KR20130069897A KR20140146921A (en) | 2013-06-18 | 2013-06-18 | Optical film having anti-wavelength dispersibility, polarizing plate comprising the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2018197848A (en) * | 2017-05-24 | 2018-12-13 | 大阪ガスケミカル株式会社 | Polarizing plate protective film, manufacturing method therefor, and polarizing plate |
| CN109883993A (en) * | 2019-03-05 | 2019-06-14 | 中国计量大学 | The measurement method of non-uniform dielectric field based on Hartmann's ray tracing |
| CN109883996A (en) * | 2019-03-05 | 2019-06-14 | 中国计量大学 | The measurement method of non-uniform dielectric field based on Hartmann's ray tracing |
| CN109883994A (en) * | 2019-03-05 | 2019-06-14 | 中国计量大学 | The measurement method of non-uniform dielectric field based on Hartmann's ray tracing |
| KR20200019014A (en) * | 2018-08-13 | 2020-02-21 | 삼성에스디아이 주식회사 | Retardation film, polarizing plate comprising the same and display apparatus comprising the same |
| KR20200039375A (en) * | 2018-10-05 | 2020-04-16 | 삼성에스디아이 주식회사 | Retardation film, polarizing plate comprising the same and display apparatus comprising the same |
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- 2013-06-18 KR KR20130069897A patent/KR20140146921A/en active Search and Examination
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018197848A (en) * | 2017-05-24 | 2018-12-13 | 大阪ガスケミカル株式会社 | Polarizing plate protective film, manufacturing method therefor, and polarizing plate |
| KR20200019014A (en) * | 2018-08-13 | 2020-02-21 | 삼성에스디아이 주식회사 | Retardation film, polarizing plate comprising the same and display apparatus comprising the same |
| KR20200039375A (en) * | 2018-10-05 | 2020-04-16 | 삼성에스디아이 주식회사 | Retardation film, polarizing plate comprising the same and display apparatus comprising the same |
| CN109883993A (en) * | 2019-03-05 | 2019-06-14 | 中国计量大学 | The measurement method of non-uniform dielectric field based on Hartmann's ray tracing |
| CN109883996A (en) * | 2019-03-05 | 2019-06-14 | 中国计量大学 | The measurement method of non-uniform dielectric field based on Hartmann's ray tracing |
| CN109883994A (en) * | 2019-03-05 | 2019-06-14 | 中国计量大学 | The measurement method of non-uniform dielectric field based on Hartmann's ray tracing |
| KR20210019356A (en) * | 2019-08-12 | 2021-02-22 | 삼성에스디아이 주식회사 | Polarizing plate and optical display apparatus comprising the same |
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