WO2013022245A2 - Film optique - Google Patents

Film optique Download PDF

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Publication number
WO2013022245A2
WO2013022245A2 PCT/KR2012/006241 KR2012006241W WO2013022245A2 WO 2013022245 A2 WO2013022245 A2 WO 2013022245A2 KR 2012006241 W KR2012006241 W KR 2012006241W WO 2013022245 A2 WO2013022245 A2 WO 2013022245A2
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WIPO (PCT)
Prior art keywords
layer
retardation layer
positive biaxial
optical film
biaxial retardation
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PCT/KR2012/006241
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English (en)
Korean (ko)
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WO2013022245A3 (fr
Inventor
전병건
윤혁
유수영
박문수
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201280038703.2A priority Critical patent/CN103733095B/zh
Priority to JP2014523856A priority patent/JP6089343B2/ja
Priority claimed from KR1020120085805A external-priority patent/KR101544249B1/ko
Publication of WO2013022245A2 publication Critical patent/WO2013022245A2/fr
Publication of WO2013022245A3 publication Critical patent/WO2013022245A3/fr

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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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
    • 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
    • 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
    • G02F1/133635—Multifunctional compensators

Definitions

  • the present application relates to an optical film, a polarizing plate, and a display device.
  • the retardation film may be disposed on one side or both sides of the liquid crystal cell, for example, to improve the viewing angle characteristic of the LCD (Liquid Crystal Display), as shown in Patent Document 1 and the like.
  • the retardation film may also be used for antireflection and securing visibility in a reflective LCD or OLED (Organic Light Emitting Device).
  • the retardation film includes 1/2 wavelength or 1/4 wavelength retardation film or the like depending on the phase retardation characteristic.
  • Conventional 1/2 or 1/4 wavelength retardation film has a problem that the phase difference is changed for each wavelength, and thus the range of the wavelength acting as the 1/2 or 1/4 wavelength retardation film is limited to only a partial range.
  • a film that functions as a quarter-wave retardation film for light at a wavelength of 550 nm often does not function as a quarter-wave retardation film for light at a wavelength of 450 nm or 650 nm.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 1996-321381
  • the present application provides an optical film, a polarizing plate, and a display device.
  • Exemplary optical films can include a positive biaxial retardation layer and an optically anisotropic layer.
  • the optically anisotropic layer may be, for example, a uniaxial retardation layer or a biaxial retardation layer.
  • uniaxial retardation layer or uniaxial retardation film refers to a refractive index (hereinafter referred to as Nx) in the x-axis direction, a refractive index (hereinafter referred to as Ny) in the y-axis direction and a refractive index (hereinafter referred to as Nz) in the y-axis direction of the layer or film.
  • Nx refractive index
  • Ny refractive index
  • Nz refractive index in the y-axis direction of the layer or film.
  • the refractive index of two) may be the same, and the other one may mean a layer or a film having a different refractive index. In the present specification, the same means substantially the same.
  • the x-axis for example, as shown in Figure 1, means one direction on the plane of the retardation layer or the film
  • the y-axis refers to the plane direction perpendicular to the x-axis, the z-axis, the x-axis And the direction of the normal of the plane formed by the y-axis, for example, the thickness direction of the retardation layer or the film.
  • the x axis may be in a direction parallel to a slow axis of the retardation layer or the film
  • the y axis may be a direction parallel to a fast axis of the retardation layer or the film.
  • satisfying the following formula 1 may be defined as a positive uniaxial retardation layer or film, and satisfying the following formula 2 may be defined as a negative uniaxial retardation layer or film.
  • Nx Nz ⁇ Ny
  • biaxial retardation layer or biaxial retardation film may refer to a layer or film in which the refractive indexes in three directions of Nx, Ny, and Nz of the layer or film are all different from each other.
  • satisfying Equation 3 below may be defined as a positive biaxial retardation layer or film
  • satisfying Equation 4 below may be defined as a negative biaxial retardation layer or film.
  • the positive biaxial retardation layer and the optically anisotropic layer may be present in a stacked state.
  • FIG. 2 is a diagram illustrating an exemplary optical film 1 and shows a state in which the positive biaxial retardation layer 101 and the optically anisotropic layer 102 are stacked on each other.
  • the positive biaxial retardation layer and the optically anisotropic layer may be perpendicular to each other.
  • optical axis means a slow axis or a fast axis, and may mean a slow axis unless otherwise specified.
  • vertical, orthogonal, horizontal or parallel means substantially vertical, orthogonal, horizontal or parallel in the range which does not impair the desired effect. Accordingly, each term may include, for example, an error within ⁇ 15 degrees, within ⁇ 10 degrees, within ⁇ 5 degrees, or within ⁇ 3 degrees.
  • the positive biaxial retardation layer and the optically anisotropic layer contained in the optical film and the optical film can satisfy the following formulas 5 to 7.
  • phase difference is the absolute value of the phase difference with respect to light of the wavelength of ⁇ nm of any of the positive biaxial retardation layer and the optically anisotropic layer (hereinafter, referred to as the first film)
  • is an absolute value of the phase difference with respect to the light of the wavelength of (lambda) nm of the other (henceforth 2nd film) of a positive biaxial retardation layer and an optically anisotropic layer.
  • the phase difference may be, for example, a plane phase difference or a phase difference in the thickness direction, and may be a plane phase difference unless otherwise specified.
  • R 1 ( ⁇ ) is a phase difference with respect to light having a wavelength of ⁇ nm of the first film
  • R 2 ( ⁇ ) is a phase difference with respect to light having a wavelength of ⁇ nm of the second film.
  • R ( ⁇ ) may mean a phase difference, for example, a planar phase difference, of an optical film, a retardation layer, or a retardation film measured with respect to light of a wavelength of ⁇ nm. That is, in Equation 6, R 1 550 is a phase difference with respect to light having a wavelength of 550 nm of the first film, for example, a planar phase difference, and R 2 550 is light having a wavelength of 550 nm of the second film. Phase difference with respect to, for example, cotton yarn phase difference.
  • R (450) is the phase difference of the optical film with respect to light of a wavelength of 450 nm, for example, the retardation phase
  • R (550) is the phase difference of the optical film with respect to light of the wavelength of 550 nm,
  • R (650) may be a phase difference of the optical film, for example, a planar phase difference with respect to light of a wavelength of 650 nm.
  • the surface retardation of the optical film, the retardation layer or the retardation film may be a numerical value calculated by Equation 8 below, and the phase difference in the thickness direction may be a numerical value calculated by Equation 9 below.
  • RI is a planar retardation
  • RT is a retardation in the thickness direction
  • d is a thickness of an optical film, a retardation layer, or a retardation film
  • Nx, Ny, and Nz are the x-axis, y-axis, and z defined above, respectively.
  • Refractive index in the axial direction is a planar retardation
  • RT is a retardation in the thickness direction
  • d is a thickness of an optical film, a retardation layer, or a retardation film
  • Nx, Ny, and Nz are the x-axis, y-axis, and z defined above, respectively.
  • Refractive index in the axial direction is a planar retardation
  • RT is a retardation in the thickness direction
  • d is a thickness of an optical film, a retardation layer, or a retardation film
  • Nx, Ny, and Nz are the x-axis, y-axis, and z defined above, respectively
  • an optical film having overall reverse wavelength dispersion characteristics may be formed. That is, in the positive biaxial retardation layer and the optically anisotropic layer of the optical film, as shown in Equation 5, R ( ⁇ ) / R (550) of the large layer is planar as in Equation 6, compared with the layer having different absolute values of the planar retardation.
  • R ( ⁇ ) / R (550)) of the smaller layer than other layers and the optical axes are laminated at right angles to each other, it is possible to provide an optical film having reverse wavelength dispersion characteristics according to Equation 7. .
  • R (650) / R (550) may be a film having a larger value than R (450) / R (550) as defined in Equation 7.
  • R (450) / R (550) of the optical film is 0.81 to 0.99, 0.82 to 0.98, 0.83 to 0.97, 0.84 to 0.96, 0.85 to 0.95, 0.86 to 0.94, 0.87 to 0.93, 0.88 to 0.92 or 0.89 It may be from 0.91, and R (650) / R (550), having a value greater than R (450) / R (550), 1.01 to 1.19, 1.02 to 1.18, 1.03 to 1.17, 1.04 to 1.16, 1.05 To 1.15, 1.06 to 1.14, 1.07 to 1.13, 1.08 to 1.12, or 1.09 to 1.11.
  • the optical film may have, for example, quarter wave phase delay characteristics.
  • the term "n-wavelength phase retardation characteristic" may mean a characteristic capable of retarding incident light by n times the wavelength of the incident light within at least a portion of the wavelength range.
  • the optical film may have a plane retardation with respect to light having a wavelength of 550 nm of about 100 nm to 250 nm, 100 nm to 220 nm, 100 nm to 200 nm, or 140 nm to 170 nm.
  • the optical film is, for example, the intensity of the leakage light measured at an inclination angle of 50 degrees while the optical film is disposed on one surface of a linear polarizer, for example, an absorption type linear polarizer, is, for example, 0.1 AU (arbitrary unit), 0.08 AU or less, 0.07 AU or less, 0.06 AU or less, 0.05 AU or less, or 0.04 AU or less.
  • the strength of the leaked steel may be, for example, the intensity of the leaked light observed from the side of the linear polarizer while irradiating light from the side of the optical film while the optical film is disposed on one surface of the linear polarizer.
  • strength of the said leaking light is the intensity
  • the terms of the inclination angle and the east angle are described below with reference to FIG. 3.
  • the inclination angle is formed by the normal of the xy plane, that is, the z-axis and the viewing direction P of FIG. 3.
  • the east angle may mean, for example, an angle ( ⁇ in FIG. 3) formed by the projection of the x-axis and the xy plane of the observation direction P.
  • the positive biaxial retardation layer included in the optical film may have, for example, 1/2 or 1/4 wavelength phase delay characteristics, and may have, for example, 1/2 wavelength phase delay characteristics.
  • the positive biaxial retardation layer may have a plane retardation of 200 nm to 290 nm or 220 nm to 270 nm with respect to light having a wavelength of 550 nm.
  • the planar retardation may be 95 nm to 145 nm or 105 nm to 120 nm for light having a wavelength of 550 nm.
  • the phase difference RT in the thickness direction of the positive biaxial retardation layer may be adjusted so that the ratio RT / RI to the planar phase difference RI falls within a predetermined range.
  • the ratio (RT / RI) may be determined according to, for example, the type of optically anisotropic layer included in the optical film together with the positive biaxial retardation layer.
  • the ratio (RT / RI) of the thickness direction retardation (RT) of the positive biaxial retardation layer to the planar retardation (RI) may be in a range of more than 0 and less than 3 or less than 3.
  • the ratio (RT / RI) may also be, for example, in a range above 0 and below 2.5 or in a range above 0 and below 2.
  • the ratio (RT / RI) may be adjusted according to the kind of optically anisotropic layer included in the optical film, for example, with a positive biaxial retardation layer.
  • the ratio (RT / RI) may be in the range of more than zero and 1.1 or less.
  • the ratio (RT / RI) may be 0.3 to 1.1, 0.4 to 0.9, 0.5 to 0.9, or about 0.7.
  • the ratio (RT / RI) is, for example, greater than 0 and less than or equal to 1, or 0.05 to 0.6, 0.1 to 0.45, or about 0.3 days. Can be.
  • the said ratio (RT / RI) may be in the range exceeding 0 and 2 or less, for example.
  • the ratio (RT / RI) may be 0.2 to 0.8, 0.3 to 0.7, 0.4 to 0.6, or about 0.5, in a range of more than 0 and less than or equal to 1.5.
  • the ratio (RT / RI) is, for example, greater than 0 and 2 or less, or 0.7 to 1.1, 0.8 to 1.1 or about 0.9 days. Can be.
  • the positive biaxial retardation layer may be, for example, a polymer film or a liquid crystal film.
  • a positive biaxial retardation layer can be formed from a film in which a light transmissive polymer film capable of imparting optical anisotropy by stretching is stretched in an appropriate manner.
  • an unstretched polymer film can also be used.
  • the polymer film a light transmittance of 70% or more, 80% or more or 85% or more, and a film manufactured by an absorbent cast method may be used.
  • a film having a thickness of 3 mm or less, 1 ⁇ m to 1 mm or 5 ⁇ m to 500 ⁇ m may be used in consideration of the possibility of producing a homogeneous stretched film.
  • a polyolefin film such as a polyethylene film or a polypropylene film
  • a cyclic olefin polymer (COP: Cycloolefin polymer) film such as a polynorbornene film, a polyvinyl chloride film, a polyacrylonitrile film, poly Cellulose ester-based polymer films such as sulfone films, polyacrylate films, polyvinyl alcohol films, or triacetyl cellulose (TAC) films, or copolymer films of two or more monomers among the monomers forming the polymers.
  • a cyclic olefin polymer film may be used as the polymer film.
  • cyclic olefin polymer examples include ring-opening polymers of cyclic olefins such as norbornene or hydrogenated products thereof, addition polymers of cyclic olefins, copolymers of other comonomers such as cyclic olefins and alpha-olefins, or the polymers Or a graft polymer in which a copolymer is modified with an unsaturated carboxylic acid or a derivative thereof, and the like, but is not limited thereto.
  • the positive biaxial retardation layer may also be formed using a liquid crystal film which is known in the art to form a positive biaxial retardation layer.
  • the positive biaxial retardation layer may have a thickness of, for example, 1 mm or less, 1 ⁇ m to 500 ⁇ m, or 5 ⁇ m to 300 ⁇ m, but this may be changed according to the purpose.
  • the optically anisotropic layer included with the positive biaxial retardation layer in the optical film may have, for example, 1/2 or 1/4 wavelength phase retardation characteristics.
  • the optically anisotropic layer may have a quarter wavelength phase delay property, and the positive biaxial retardation layer has a 1/4 wavelength.
  • the phase delay characteristic has the optically anisotropic layer may have a half wavelength phase delay characteristic.
  • an on-plane retardation with respect to light having a wavelength of 550 nm may be 200 nm to 290 nm or 220 nm to 270 nm.
  • the plane retardation of the positive biaxial retardation layer may be 95 nm to 145 nm or 105 nm to 120 nm for light having a wavelength of 550 nm.
  • the optically anisotropic layer may be, for example, a uniaxial retardation layer or a biaxial retardation layer.
  • the uniaxial retardation layer or biaxial retardation layer may be a positive or negative uniaxial retardation layer, or may be a positive or negative biaxial retardation layer.
  • the on-plane retardation of the uniaxial or biaxial retardation layer may be determined, for example, in a range in which the optically anisotropic layer can exhibit 1/2 or 1/4 wavelength phase delay characteristics.
  • the phase difference in the thickness direction of the negative uniaxial retardation layer or the positive or negative biaxial retardation layer can be appropriately selected within a range that does not impair the desired purpose.
  • the retardation layer may have a phase difference in the thickness direction of about -200 nm to 200 nm, -150 nm to 150 nm, -100 nm to 110 nm, or about -60 nm to 110 nm.
  • the optically anisotropic layer can be formed of, for example, a known polymer film or a liquid crystal film, such as the above-described biaxial retardation layer.
  • a known polymer film or a liquid crystal film such as the above-described biaxial retardation layer.
  • a liquid crystal film such as the above-described biaxial retardation layer.
  • polymer films or liquid crystal films capable of forming a positive or negative uniaxial or biaxial retardation layer in this field, all of which can be used.
  • the optically anisotropic layer may have a thickness of, for example, about 1 mm or less, 1 ⁇ m to 500 ⁇ m, or 5 ⁇ m to 300 ⁇ m.
  • the positive biaxial retardation layer and the optically anisotropic layer can be attached to each other by, for example, a suitable adhesive or an adhesive to form an optical film.
  • An exemplary polarizing plate may include a linear polarizer and the optical film. Therefore, the polarizing plate may include a linear polarizer, a positive biaxial retardation layer and an optically anisotropic layer. As described above, the details of the optical film, the positive biaxial retardation layer, and the optically anisotropic layer may be the same. In one example, an optically anisotropic layer of the optical film may be attached to one surface of the linear polarizer to form a polarizing plate. In this case, the polarizing plate may include linear polarizers, the optically anisotropic layer and the positive biaxial retardation layer which are sequentially arranged. 4 exemplarily shows the polarizing plate 3 including the linearly polarized light polarizer 301, the optically anisotropic layer 102 and the positive biaxial retardation layer 101.
  • the linear polarizer is a functional device capable of extracting light vibrating in one direction from incident light vibrating in various directions.
  • the linear polarizer may be a known absorption linear polarizer.
  • a conventional linear polarizer such as a poly (vinyl alcohol) linear polarizer can be used.
  • the linear polarizer may be a polyvinyl alcohol film or sheet to which dichroic dyes or iodine are adsorbed and oriented.
  • the polyvinyl alcohol can be obtained, for example, by gelling polyvinylacetate.
  • polyvinyl acetate Homopolymer of vinyl acetate; And copolymers of vinyl acetate and other monomers, and the like.
  • the gelation degree of polyvinylacetate is generally about 85 mol% to about 100 mol% or 98 mol% to 100 mol%.
  • the degree of polymerization of the polyvinyl alcohol of the linear polarizer may generally be about 1,000 to about 10,000 or about 1,500 to about 5,000.
  • the light absorption axis of the linear polarizer in the polarizing plate may be, for example, at an angle of about 45 degrees with the optical axis of the positive biaxial retardation layer of the optical film.
  • the optical axes of the positive biaxial retardation layer and the optically anisotropic layer in the optical film may be perpendicular to each other.
  • the polarizing plate has an intensity of leakage light measured at an inclination angle of 50 degrees on the linear polarizer side, for example, 0.1 AU (arbitrary unit), 0.08 AU or less, 0.07 AU or less, 0.06 AU or less, 0.05 AU or less, or 0.04 AU or less.
  • the strength of the leakage steel may be, for example, the intensity of the leakage light observed from the side of the linear polarizer while irradiating light from the polarizing plate to the optical film side.
  • the intensity of the leakage light may be the intensity measured for all the tilt angles at an inclination angle of 50 degrees. Through this, it is possible to provide a polarizing plate having excellent visibility characteristics at an inclination angle.
  • the linear polarizer and the optical film may be attached to each other by, for example, a suitable known adhesive layer or adhesive layer.
  • the optical film and the linear polarizer may be directly attached through the adhesive layer or the pressure-sensitive adhesive layer, and optionally, further include a primer layer between the linear polarizer and the adhesive layer or between the optical film and the adhesive layer. It may be attached.
  • the method of attaching the optical film and the linear polarizer is not particularly limited.
  • the adhesive or pressure-sensitive adhesive composition is coated on one surface of the linear polarizer or the optical film, the adhesive composition is cured after laminating the linear polarizer and the optical film, or by a dropping method using the adhesive or pressure-sensitive adhesive composition.
  • a method of laminating the linear polarizer and the optical film and curing the composition can be used. Curing of the composition in the above, for example, in consideration of the components contained in the composition may be carried out by irradiating an active energy ray of a suitable intensity with an appropriate amount of light.
  • the polarizing plate may further include a protective layer of the linear polarizer existing on one side of the linear polarizer, for example, on the side opposite to the surface in contact with the optical film of the linear polarizer, or present on both surfaces of the linear polarizer.
  • the present application also relates to a display device.
  • An exemplary display device may include the polarizer.
  • the specific kind of display device including a polarizing plate is not particularly limited.
  • the device may be, for example, a liquid crystal display such as a reflective or transflective liquid crystal display, or an organic light emitting device.
  • the arrangement form of the polarizing plate in the display device is not particularly limited, and a known form may be adopted, for example.
  • the polarizing plate may be used as any one of the polarizing plates of the liquid crystal panel in order to prevent anti-reflection of external light and to ensure visibility.
  • the polarizer may be disposed outside the electrode layer of the organic light emitting diode display in order to prevent reflection of external light and ensure visibility.
  • Exemplary optical films can exhibit desired phase retardation properties over a wide wavelength range and do not leak light even at oblique angles.
  • the optical film may exhibit quarter-wave phase retardation characteristics and may be used in a reflective or transflective liquid crystal display or an organic light emitting display.
  • 1 is a diagram schematically showing the x-axis, y-axis and z-axis of the optically anisotropic layer or film.
  • FIG. 2 is a schematic diagram of an exemplary optical film.
  • 3 is a view for explaining an inclination angle and an east angle.
  • FIG. 4 is a schematic diagram of an exemplary polarizing plate.
  • FIG. 9 is a result of measuring light leakage intensity with respect to the optical films of Comparative Examples 1 to 4 and Example 1.
  • optical film will be described in more detail with reference to Examples and Comparative Examples, but the scope of the optical film is not limited by the Examples given below.
  • the retardation in the plane or thickness direction of the optical film was measured for light of 550 nm wavelength using Axoscan equipment (manufactured by Axomatrics) capable of measuring 16 Muller Matrix.
  • Axoscan equipment manufactured by Axomatrics
  • 16 Muller matrices were obtained according to the manufacturer's manual, and the phase difference was extracted through the Axoscan instrument.
  • the optical leakage intensity at the inclination angle of 50 degrees is attached to one surface of the PVA (poly (vinyl alcohol)) polarizer in the example or the comparative example, and the reflectance at the inclination angle of 50 degrees is measured using a spectrometer (N & K).
  • the intensity of the light leaking from the PVA polarizer was measured and evaluated accordingly at all azimuthal angles.
  • the light leakage intensity is defined as an AU (Arbitrary unit) based on the maximum luminance at all east angles as a control.
  • a COP (Cycloolefin) film having a plane retardation of about 250 nm is used, and as a positive uniaxial retardation layer, the slow axis and the positive axis of the positive biaxial retardation layer are about 105 nm.
  • the optical films were manufactured by adhering the slow axes of the uniaxial retardation layers to be perpendicular to each other. The overall on-plane retardation of the optical film was about 145 nm.
  • a polarizing plate was prepared by attaching the positive uniaxial retardation layer of the optical film to the PVA polarizer, and changing the ratio (RT / RI) of the phase difference (RT) in the thickness direction with respect to the planar phase difference (RI) of the positive biaxial retardation layer. While measuring the intensity of light leaking from the PVA polarizer while irradiating with light toward the optical film side, the result is shown in FIG. 4. At the time of manufacture of a polarizing plate, when the light absorption axis of a PVA polarizer and the slow axis of a positive biaxial retardation layer were observed from the polarizer side, it adhered so that it might become about 45 degree counterclockwise. In FIG.
  • the Y axis is the light leakage intensity (unit: AU) at the inclination angle of 50 degrees measured in the above state and the angle at which the maximum light leakage occurs among all the mirror angles
  • the X axis is the planar phase difference of the positive biaxial retardation layer ( The ratio (RT / RI) of the phase difference RT in the thickness direction with respect to RI) is shown.
  • a positive biaxial retardation layer and a negative uniaxial retardation layer similar to Example 1 were formed with a COP (Cycloolefin) film having a surface retardation of about 105 nm and a thickness retardation of about 105 nm.
  • An optical film was manufactured by attaching the axes and the slow axes of the negative uniaxial retardation layer to be perpendicular to each other. The overall on-plane retardation of the optical film was about 145 nm.
  • a polarizing plate was prepared by attaching the negative uniaxial retardation layer of the optical film to the PVA polarizer, and changing the ratio (RT / RI) of the phase difference (RT) in the thickness direction with respect to the planar phase difference (RI) of the positive biaxial retardation layer.
  • the intensity of light leaking was measured, and the results are shown in FIG. 6.
  • the Y axis is the light leakage intensity (unit: AU) at the inclination angle of 50 degrees measured in the above state and the angle at which the maximum light leakage occurs among all the mirror angles
  • the X axis is the planar phase difference of the positive biaxial retardation layer ( The ratio (RT / RI) of the phase difference RT in the thickness direction with respect to RI) is shown.
  • a COP (Cycloolefin) film having a plane retardation of about 105 nm and a retardation in the thickness direction of about -50 nm was used as a positive biaxial retardation layer.
  • An optical film was manufactured by attaching the slow axis and the slow axis of the negative biaxial retardation layer to be perpendicular to each other. The overall on-plane retardation of the optical film was about 145 nm.
  • a polarizing plate was prepared by attaching a negative biaxial retardation layer of the optical film to a PVA polarizer, and changing the ratio (RT / RI) of the phase difference (RT) in the thickness direction with respect to the planar phase difference (RI) of the positive biaxial retardation layer.
  • the intensity of leakage light was measured, and the results are shown in FIG. 7.
  • the polarizing plate when the light absorption axis of the PVA polarizer and the slow axis of the positive biaxial retardation layer were observed from the polarizer side, they were attached so as to form about 45 degrees counterclockwise. In FIG.
  • the Y axis represents the light leakage intensity (unit: AU) at the inclination angle of 50 degrees measured in the above state and the angle at which the maximum light leakage occurs among all the mirror angles
  • the X axis represents the planar phase difference of the positive biaxial retardation layer ( The ratio (RT / RI) of the phase difference RT in the thickness direction with respect to RI) is shown.
  • a COP (Cycloolefin) film having a plane retardation of about 105 nm and a retardation of about 50 nm in the thickness direction was ground on the positive biaxial retardation layer.
  • the optical films were made by attaching the axes perpendicular to each other.
  • the overall on-plane retardation of the optical film was about 145 nm.
  • a polarizing plate was prepared by attaching a positive biaxial retardation layer having a plane retardation of 105 nm to an optical film with a PVA polarizer, and retardation in the thickness direction with respect to the planar retardation (RI) of a positive biaxial retardation layer having a plane retardation of 250 nm. While changing the ratio (RT / RI) of (RT), the intensity of light leaking was measured similarly to Example 1, and the result is shown in FIG. At the time of manufacture of the polarizing plate, when the slow axis of the positive biaxial retardation layer whose surface retardation was about 250 nm of the PVA polarizer was observed from the polarizer side, it adhered so that it might become about 45 degree counterclockwise. In FIG.
  • the Y axis is the light leakage intensity (unit: AU) at the inclination angle of 50 degrees measured in the above state and the angle at which the maximum light leakage occurs among all the copper angles
  • the X axis is the positive biaxial phase difference layer.
  • the ratio (RT / RI) of the phase difference RT in the thickness direction to the surface phase difference RI is shown.
  • An optical film was prepared by attaching a positive uniaxial retardation layer (COP film) having a planar retardation of about 250 nm and a positive uniaxial retardation layer (liquid crystal film) having a planar retardation of about 105 nm so that their slow axes are perpendicular to each other. .
  • the overall on-plane retardation of the optical film was about 145 nm.
  • a uniaxial retardation layer having a plane retardation of 105 nm on the optical film was attached to a PVA polarizer to prepare a polarizing plate, and the intensity of light leaking from the PVA polarizer was measured in all the above described angles while irradiating with light to the optical film side.
  • a polycarbonate WRF (Wide-band Retardation Film) manufactured by Teijin was attached to a PVA polarizer to prepare a polarizing plate, and the intensity of leakage light was measured in the same manner as in Comparative Example 1. Light leakage intensity at all tilt angles at the inclination angle of 50 degrees of the optical film of Comparative Example 3 is shown in E graph in FIG.
  • a positive uniaxial retardation film having a plane retardation of about 250 nm is attached to one surface of the PVA polarizer so that the slow axis of the film is about 15 degrees clockwise with the light absorption axis of the polarizer, and the positive uniaxial retardation film
  • a polarizing plate was prepared by attaching a positive uniaxial retardation film having a plane retardation of about 105 nm on one surface of the film such that the slow axis of the film was about 75 degrees clockwise with the light absorption axis of the polarizer, similarly to Comparative Example 1
  • the intensity of the leaked light was measured. Light leakage intensity at all tilt angles at the inclination angle of 50 degrees of the optical film of Comparative Example 4 is shown in the A graph in FIG.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention se rapporte à un film optique, à une plaque de polarisation et à un appareil d'affichage. Un film optique donné à titre d'exemple peut présenter une caractéristique de retard de phase souhaitée sur une large plage de longueurs d'onde et ne laisse pas s'échapper la lumière même lorsqu'il est incliné selon un certain angle. Par exemple, le film optique peut montrer une caractéristique de retard de phase de 1/4 et peut être utilisé dans un affichage à cristaux liquides réflectif ou semi-perméable ou dans un appareil d'affichage électroluminescent organique, ou similaire.
PCT/KR2012/006241 2011-08-05 2012-08-06 Film optique WO2013022245A2 (fr)

Priority Applications (2)

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CN201280038703.2A CN103733095B (zh) 2011-08-05 2012-08-06 光学膜
JP2014523856A JP6089343B2 (ja) 2011-08-05 2012-08-06 光学フィルム

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KR10-2011-0077987 2011-08-05
KR20110077987 2011-08-05
KR10-2012-0085805 2012-08-06
KR1020120085805A KR101544249B1 (ko) 2011-08-05 2012-08-06 광학 필름

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060050706A (ko) * 2004-08-26 2006-05-19 닛토덴코 가부시키가이샤 위상차 필름 및 이를 제조하는 방법, 및 모두 위상차필름을 이용하는 광학 필름, 액정 패널, 및 액정 표시 장치
JP2006133328A (ja) * 2004-11-02 2006-05-25 Sekisui Chem Co Ltd 位相差フィルム一体型偏光板
KR20060059855A (ko) * 2003-08-11 2006-06-02 소니 가부시끼 가이샤 액정 표시 장치
KR20070102964A (ko) * 2006-04-17 2007-10-22 후지필름 가부시키가이샤 광학 보상 시트, 그리고 이것을 사용한 편광판 및 액정표시 장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060059855A (ko) * 2003-08-11 2006-06-02 소니 가부시끼 가이샤 액정 표시 장치
KR20060050706A (ko) * 2004-08-26 2006-05-19 닛토덴코 가부시키가이샤 위상차 필름 및 이를 제조하는 방법, 및 모두 위상차필름을 이용하는 광학 필름, 액정 패널, 및 액정 표시 장치
JP2006133328A (ja) * 2004-11-02 2006-05-25 Sekisui Chem Co Ltd 位相差フィルム一体型偏光板
KR20070102964A (ko) * 2006-04-17 2007-10-22 후지필름 가부시키가이샤 광학 보상 시트, 그리고 이것을 사용한 편광판 및 액정표시 장치

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