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WO2018139875A1 - Filtre optique pour antireflet et dispositif électroluminescent organique - Google Patents

Filtre optique pour antireflet et dispositif électroluminescent organique Download PDF

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Publication number
WO2018139875A1
WO2018139875A1 PCT/KR2018/001126 KR2018001126W WO2018139875A1 WO 2018139875 A1 WO2018139875 A1 WO 2018139875A1 KR 2018001126 W KR2018001126 W KR 2018001126W WO 2018139875 A1 WO2018139875 A1 WO 2018139875A1
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WIPO (PCT)
Prior art keywords
retardation film
optical filter
liquid crystal
degrees
polarizer
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Application number
PCT/KR2018/001126
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English (en)
Korean (ko)
Inventor
이은혜
벨리아에프세르게이
김신영
이지연
박문수
윤혁
김선국
Original Assignee
주식회사 엘지화학
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Filing date
Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to JP2019540411A priority Critical patent/JP7055425B2/ja
Priority to CN201880008251.0A priority patent/CN110235029B/zh
Priority to EP18744109.2A priority patent/EP3575836B1/fr
Priority to US16/480,642 priority patent/US10943960B2/en
Priority claimed from KR1020180009386A external-priority patent/KR102024264B1/ko
Publication of WO2018139875A1 publication Critical patent/WO2018139875A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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

Definitions

  • the present application relates to an antireflection optical filter and an organic light emitting device.
  • the organic light emitting device is a self-luminous display device that emits light by itself and thus does not require a separate backlight, thereby reducing thickness and advantageously implementing a flexible display device.
  • the organic light emitting device may reflect external light by the metal electrode and the metal wiring formed on the organic light emitting display panel, and the visibility and the contrast ratio may be deteriorated by the reflected external light, resulting in poor display quality.
  • a circularly polarizing plate may be attached to one surface of an organic light emitting display panel to reduce the leakage of the reflected external light to the outside.
  • the currently developed circular polarizer has a strong viewing angle dependency, and thus has a problem in that visibility is reduced due to a decrease in antireflection performance toward the side.
  • the problem to be solved by the present application is to provide an optical filter having excellent omnidirectional antireflection performance in front as well as side and an organic light emitting device having improved visibility by applying the optical filter.
  • the present application relates to an antireflection optical filter.
  • the optical filter may sequentially include a first retardation film 10, a second retardation film 20, and a polarizer 30.
  • the first retardation film may have an in-plane optical axis and may have a quarter-wave retardation characteristic.
  • the second retardation film may have an optical axis that is inclined constantly along the thickness direction.
  • the second retardation film having such a property may be referred to as a constant tilt film.
  • the polarizer may have an absorption axis formed in one direction.
  • the polarizer means an element that exhibits selective transmission and absorption characteristics with respect to incident light.
  • the polarizer may transmit, for example, light oscillating in one direction from incident light oscillating in various directions, and absorb light oscillating in the other direction.
  • the polarizer included in the optical filter may be a linear polarizer.
  • the linearly polarized light refers to a case where linearly polarized light that selectively transmits light vibrates in one direction and linearly vibrates in a direction orthogonal to the vibration direction of the linearly polarized light.
  • linear polarizer examples include a polarizer in which iodine is dyed in a polymer stretched film such as a PVA stretched film, or a liquid crystal polymerized in an oriented state as a host, and an anisotropic dye arranged according to the alignment of the liquid crystal as a guest.
  • Guest-hosted polarizers may be used, but are not limited thereto.
  • a PVA stretched film may be used as the polarizer.
  • the transmittance to polarization degree of the polarizer may be appropriately adjusted in consideration of the purpose of the present application.
  • the transmittance of the polarizer may be 42.5% to 55%, and the degree of polarization may be 65% to 99.9997%.
  • each of the above cases may include an error within about ⁇ 15 degrees, an error within about ⁇ 10 degrees or an error within about ⁇ 5 degrees.
  • the retardation film may mean an element capable of converting incident polarization by controlling birefringence as an optical “anisotropic” film.
  • the x-axis refers to a direction parallel to the in-plane slow axis of the retardation film
  • the y-axis refers to a direction parallel to the in-plane fast axis of the retardation film.
  • the z axis means the thickness direction of the retardation film.
  • the x and y axes may be perpendicular to each other in plane.
  • the slow axis when the retardation film includes a rod-shaped liquid crystal molecule, the slow axis may mean a long axis direction of the rod shape, and when the retardation film includes a disc-shaped liquid crystal molecule, the slow axis may mean a normal direction of the disc shape. . While describing the optical axis of the retardation film herein, unless otherwise specified, the slow axis means. In the present specification, the refractive index of the retardation film is described, and unless otherwise specified, the refractive index with respect to light having a wavelength of about 550 nm.
  • the surface retardation (Rin) of the retardation film is calculated by the following Equation 1.
  • Rin d ⁇ (nx-ny)
  • Rin is the retardation of the plane
  • d is the thickness of the retardation film
  • nx and ny are the refractive index in the x-axis and y-axis directions defined above, respectively.
  • the plane retardation of the retardation film is described, and unless otherwise specified, the planar retardation with respect to light having a wavelength of about 550 nm.
  • the reverse wavelength dispersion characteristic may mean a characteristic satisfying Equation 2 below
  • a normal wavelength dispersion characteristic may mean a characteristic satisfying Equation 3 below
  • the flat wavelength dispersion characteristic is flat wavelength dispersion
  • R (450) / R (550) R (650) / R (550)
  • R ( ⁇ ) is a plane retardation of the retardation film with respect to ⁇ nm light.
  • a retardation film satisfying the following formula 5 may be referred to as a so-called + A plate, and a retardation film satisfying the following formula 6 may be referred to as a + C plate.
  • nx ny ⁇ nz
  • nx, ny, and nz are refractive indexes in the x-axis, y-axis, and nz directions, respectively, defined above.
  • the optical filter may sequentially include a first retardation film, a second retardation film, and a polarizer. If this arrangement order is satisfied, it may be advantageous to improve the omnidirectional antireflection performance on the side as well as the front side.
  • the first retardation film may have an in-plane optical axis. That is, the first retardation film may have an optical axis parallel to the plane direction.
  • the optical axis of the first retardation film may be about 40 degrees to 50 degrees, about 43 degrees to 47 degrees, and specifically about 45 degrees with the absorption axis of the polarizer.
  • the optical axis of the first retardation film and the absorption axis of the polarizer form the above angular range, it may be advantageous to improve the omnidirectional antireflection performance on the side as well as the front side.
  • the first retardation film may have a quarter wavelength retardation characteristic.
  • the "n wavelength phase delay characteristic” may mean a characteristic capable of retarding incident light by n times the wavelength of the incident light within at least part of a wavelength range. Therefore, the quarter wavelength phase delay characteristic may mean a characteristic that may phase-retard incident light by a quarter of a wavelength of the incident light within at least a portion of a wavelength range.
  • the on-plane retardation of light of 550 nm wavelength of the first retardation film may be 120 nm to 160 nm.
  • the planar phase difference may be specifically 120 nm or more, 130 nm or more, 135 nm or more, and may be 160 nm or less, 150 nm or less, or 140 nm or less.
  • the first retardation film may have reverse wavelength dispersion.
  • the first retardation film may have a property that the in-plane retardation increases as the wavelength of the incident light increases.
  • the incident light may be, for example, 300 nm to 800 nm.
  • the R (450) / R (550) value of the first retardation film may be 0.99 or less. In one example, the R (450) / R (550) value may be in the range of 0.6 to 0.99.
  • the R (450) / R (550) value may be, for example, 0.6 or more, 0.65 or more, 0.7 or more, or 0.75 or more, 0.99 or less, 0.95 or less, 0.9 or less, 0.85 or less, or 0.8 or less.
  • the value of R (650) / R (550) of the first retardation film may be 1.01 to 1.19, 1.05 to 1.15, or 1.09 to 1.11 while having a value greater than that of R (450) / R 550.
  • the first retardation film may be a uniaxial retardation film.
  • the first retardation film may be a + A plate satisfying Equation 5.
  • the first retardation film may be a polymer film.
  • the polymer film include polyolefins such as PC (polycarbonate), norbornene resin (norbonene resin), PVA (poly (vinyl alcohol)), PS (polystyrene), PMMA (poly (methyl methacrylate)), PP (polypropylene), A film including Par (poly (arylate)), PA (polyamide), PET (poly (ethylene terephthalate)) or PS (polysulfone) may be used.
  • the polymer film may be stretched or shrunk under appropriate conditions to impart birefringence to be used as the first retardation film.
  • the first retardation film may be a liquid crystal film.
  • the liquid crystal film may include a state in which the liquid crystal molecules are aligned and polymerized.
  • the liquid crystal molecules may be polymerizable liquid crystal molecules.
  • the polymerizable liquid crystal molecule may mean a molecule including a site capable of exhibiting liquid crystal, for example, a mesogen skeleton, and one or more polymerizable functional groups.
  • including the polymerizable liquid crystal molecules in a polymerized form may mean a state in which the liquid crystal molecules are polymerized to form a skeleton such as a main chain or side chain of the liquid crystal polymer in the liquid crystal film.
  • the liquid crystal film may include, for example, the liquid crystal molecules in a horizontally routed state.
  • a "horizontal orientation" can mean the state in which the slow axis of the liquid crystal film containing liquid crystal molecules is oriented horizontally with respect to the plane of a liquid crystal film.
  • the second retardation film may have an optical axis that is inclined constantly along the thickness direction.
  • the inclination of the optical axis may mean that the optical axis is inclined at a predetermined angle with respect to the plane of the retardation film.
  • the inclination angle may mean a minimum angle formed by the plane of the optical axis and the retardation film.
  • the inclination angle may mean an angle formed by the long axis direction of the rod shape and the plane of the retardation film.
  • the inclination angle may mean an angle between the disc surface and the plane of the retardation film.
  • the inclination angle may be, for example, greater than 0 degrees and less than 90 degrees, and as described below, the inclination angle range may be appropriately adjusted in consideration of antireflection performance.
  • the inclination direction of the optical axis of the second retardation film may be parallel to the absorption axis of the polarizer.
  • the inclination direction of the optical axis may refer to the projection of the optical axis to the plane of the second retardation film.
  • the inclination direction of the optical axis of the second retardation film and the absorption axis of the polarizer may form an angle of 0 degrees or more, for example, less than 4 degrees, 3.5 degrees or less, 3 degrees or less, 2.5 degrees or less, 2 degrees or less, 1.5 degrees or less. It can achieve an angle of less than or equal to 1 degree or less than 0.5 degrees, preferably 0 degrees.
  • the thickness of the second retardation film may be, for example, 0.3 ⁇ m to 3 ⁇ m. Within the above thickness range, it is possible to provide an optical filter having excellent antireflection characteristics in all directions. The thickness of the second retardation film can be further improved in the above-mentioned range by being adjusted within the above range according to the structure of the optical filter described below.
  • the second retardation film may have a reverse wavelength dispersion characteristic. Specific details on the reverse wavelength dispersion characteristics may be equally applied to the contents of the first retardation film. In one example, the value of R (450) / R (550) of the second retardation film may be 0.77 to 0.99, preferably 0.82 to 0.95. When the second retardation film has a reverse wavelength dispersion characteristic, it is possible to obtain an effect of further improving the reflectance characteristic.
  • the second retardation film may include a liquid crystal layer.
  • the liquid crystal layer may include liquid crystal molecules.
  • the liquid crystal layer may include liquid crystal molecules having an absolute value of refractive index anisotropy of 0.01 to 0.25.
  • the refractive index anisotropy ( ⁇ n) may mean a value of an extraordinary refractive index (ne) minus an ordinary refractive index (no).
  • the abnormal refractive index may mean a refractive index in the slow axis direction of the liquid crystal layer
  • the normal refractive index may mean a refractive index in the fast axis direction of the liquid crystal layer.
  • the refractive anisotropy may be, for example, 0.01 or more, 0.03 or more, 0.04 or more, or 0.05 or more, and 0.25 or less, 0.2 or less, 0.18 or less, 0.16 or less, 0.14 or less, or 0.12 or less.
  • the refractive index anisotropy value may be positive when the liquid crystal layer includes rod-shaped liquid crystal molecules, and the refractive index anisotropy value may be negative when the liquid crystal layer includes disk-shaped liquid crystal molecules.
  • the liquid crystal layer may include rod-shaped liquid crystal molecules or disk-shaped liquid crystal molecules.
  • the rod-shaped liquid crystal molecules may include a compound in which a linear alkyl group, an alkoxy group, a substituted benzoyloxy group, or the like is substituted in the molecular structure, and has a rod-like structure and exhibits liquid crystallinity.
  • a liquid crystal compound known to form a so-called nematic phase may be used as the rod-shaped liquid crystal molecules.
  • the term "nematic phase” may refer to a liquid crystal phase arranged in order in the major axis direction, although there is no regularity with respect to the position of the liquid crystal molecules.
  • the rod-like liquid crystal compound may have a crosslinkable or polymerizable functional group.
  • the crosslinkable or polymerizable functional group is not particularly limited, but examples thereof include alkenyl groups, epoxy groups, cyano groups, carboxyl groups, acryloyl groups, methacryloyl groups, acryloyloxy groups, methacryloyloxy groups, and the like. Can be.
  • the disk-shaped liquid crystal molecule includes a compound having a molecular center as a parent nucleus, and a linear alkyl group, an alkoxy group, a substituted benzoyloxy group, etc. are radially substituted as the linear chain, and have a discotic structure, and include a compound showing liquid crystallinity. can do.
  • a liquid crystal compound known to form a so-called discotic phase may be used as the disk-shaped liquid crystal molecules.
  • the disc-shaped liquid crystal compound has negative refractive anisotropy (uniaxiality), and examples thereof include benzene derivatives described in C. Destrade et al., Mol. Crates.
  • the discotic liquid crystal compound may have a crosslinkable or polymerizable functional group.
  • the crosslinkable or polymerizable functional group is not particularly limited, but examples thereof include alkenyl groups, epoxy groups, cyano groups, carboxyl groups, acryloyl groups, methacryloyl groups, acryloyloxy groups, methacryloyloxy groups, and the like. Can be.
  • the liquid crystal layer may include the liquid crystal molecules in a tilted alignment state.
  • the inclination orientation may mean an alignment state in which the liquid crystal molecules are inclined at an angle with respect to the plane of the liquid crystal layer, and may specifically refer to a state in which the liquid crystal molecules are not vertically or horizontally aligned.
  • the inclination orientation may mean an alignment state in which the inclination angles of all liquid crystal molecules in the liquid crystal layer are ⁇ 5 degrees or less, ⁇ 3 degrees or less, or ⁇ 1 degrees or less, and preferably the inclination angles of all liquid crystal molecules are the same. .
  • the inclination orientation may refer to an alignment state in which the graph shown in which the thickness of the liquid crystal layer is the x axis and the local tilt angle corresponding to the thickness is the y axis is a graph in which the slope is adjacent to zero. Can be.
  • the inclination angle of the optical axis of the second retardation film may be, for example, 10 degrees to 65 degrees. Within the inclination angle range, it is possible to provide an optical filter excellent in antireflection characteristics in all directions.
  • the inclination angle of the optical axis of the second retardation film can be further improved within the above range according to the structure of the optical filter described below, thereby further improving the anti-directional reflection characteristic.
  • FIG. 2 exemplarily shows an optical filter including the second retardation film 20 including the rod-shaped liquid crystal molecules R.
  • FIG. 3 exemplarily shows an optical filter including the second retardation film 30 including the disc-shaped liquid crystal molecules (D).
  • the tilt alignment of the liquid crystal molecules may be performed by a tilt alignment method of liquid crystals known in the art.
  • gradient alignment may be induced by coating liquid crystal molecules on a photo alignment layer formed by obliquely irradiating ultraviolet rays or by applying a magnetic field to the liquid crystal layer.
  • the optical filter of the present application may effectively improve the anti-reflection performance from the front as well as the side by adjusting the optical properties of the second retardation film.
  • the second retardation film may include rod-shaped liquid crystal molecules.
  • the inclination angle of the optical axis of the second retardation film may be 25 degrees to 65 degrees.
  • the inclination angle may be, for example, 25 degrees or more, 30 degrees or more, or 35 degrees or more, and 65 degrees or less, 60 degrees or less, 55 degrees or less, or 50 degrees or less.
  • the thickness of the second retardation film may be 0.35 ⁇ m to 2.2 ⁇ m.
  • the thickness may be specifically 0.35 ⁇ m or more or 0.4 ⁇ m or more, and may be 2.2 ⁇ m or less, 2.0 ⁇ m or less, or 1.8 ⁇ m or less.
  • the inclination angle of the optical axis of the second retardation film may be 35 degrees to 50 degrees.
  • the thickness of the second retardation film may be 0.4 ⁇ m to 2.2 ⁇ m.
  • the optical filter may exhibit excellent anti-reflection performance with a reflectance of less than about 1%, 0.8% or less, 0.6% or less, 0.5% or less, or 0.4% or less in terms of 60 degrees.
  • the thickness of the second retardation film may be adjusted to effectively improve the anti-reflection performance in terms of 60 degrees according to the refractive index anisotropy of the liquid crystal molecules.
  • the refractive index anisotropy of the liquid crystal molecules is 0.04 to 0.06
  • the inclination angle of the optical axis of the second retardation film is 35 degrees to 50 degrees
  • the thickness of the second retardation film is 1.8 ⁇ m to 2.2 ⁇ m, 60 degrees In terms of performance, it can exhibit better anti-reflection performance.
  • the inclination angle of the optical axis of the second retardation film is 35 degrees to 50 degrees, and when the thickness of the second retardation film is 1.15 ⁇ m to 1.3 ⁇ m, the 60 degree side The better anti-reflection performance can be seen at.
  • the refractive index anisotropy of the liquid crystal molecules is 0.1 to 0.14
  • the inclination angle of the optical axis of the second retardation film is 35 degrees to 50 degrees
  • the thickness of the second retardation film is 0.8 ⁇ m to 0.9 ⁇ m
  • the inclination angle of the optical axis of the second retardation film is 35 degrees to 50 degrees, and the thickness of the second retardation film is 0.35 ⁇ m to If the thickness is 0.45 ⁇ m, specifically 0.4 ⁇ m, a better anti-reflection performance may be exhibited in terms of 60 degrees.
  • the second retardation film may include disc-shaped liquid crystal molecules. In this case, the inclination angle of the optical axis of the second retardation film may be 10 degrees to 35 degrees.
  • the inclination angle may be, for example, 10 degrees or more, 15 degrees or more, or 20 degrees or more, and 35 degrees or less or 30 degrees or less.
  • the thickness of the second retardation film may be 1 ⁇ m to 3 ⁇ m.
  • the thickness may be, for example, 1 ⁇ m or more, 1.25 ⁇ m or more, or 1.5 ⁇ m or more, and 3 ⁇ m or less.
  • the inclination angle of the optical axis of the second retardation film may be, for example, 20 degrees to 30 degrees.
  • the thickness of the second retardation film may be 1.05 ⁇ m to 2.95 ⁇ m.
  • the optical filter may exhibit better anti-reflection performance with a reflectance of less than about 1%, 0.8% or less, or 0.6% or less at a 60 degree side.
  • the thickness of the second retardation film may be adjusted to effectively improve the antireflection performance in terms of 60 degrees according to the refractive index anisotropy of the liquid crystal molecules.
  • the refractive index anisotropy of the liquid crystal molecules is 0.07 to 0.09
  • the inclination angle of the optical axis of the second retardation film is 20 degrees to 30 degrees
  • the thickness of the second retardation film is 2.2 ⁇ m to 2.6 ⁇ m, 60 degrees In terms of performance, it can exhibit better anti-reflection performance.
  • the inclination angle of the optical axis of the second retardation film is 20 degrees to 30 degrees, and when the thickness of the second retardation film is 1.5 ⁇ m to 1.85 ⁇ m, the side at 60 degrees The better anti-reflection performance can be seen at.
  • the planar retardation of the second retardation film with respect to light having a wavelength of 550 nm may be 90 nm to 105 nm.
  • the planar retardation of the second retardation film with respect to light having a wavelength of 550 nm may be 160 nm to 250 nm.
  • the second retardation film may include a rod-shaped or disk-shaped liquid crystal molecule, and may improve antireflection performance not only from the front side but also from the side by appropriately adjusting the inclination angle, thickness, and the like.
  • the second retardation film may be more advantageous in terms of improving the omni-directional antireflection performance in comparison with the case of including the disc-shaped liquid crystal molecules.
  • the optical filter may further include a C plate. As shown in FIG. 4, the C plate 40 may be disposed outside the first retardation film 10, that is, on an opposite side on which the second retardation film is disposed.
  • the C plate may include a polymer material or a UV curable liquid crystal film.
  • the usable film may include a homeotropic aligned liquid crystal film, a biaxial stretched polycarbonate, and the like.
  • the optical filter may further include a surface treatment layer.
  • the surface treatment layer may include an antireflection layer and the like.
  • the surface treatment layer may be disposed on the outer side of the polarizer, that is, on the opposite side on which the second retardation film is disposed.
  • the antireflection layer may be a laminate of two or more layers having different refractive indices, but is not limited thereto.
  • the first retardation film, the second retardation film, and the polarizer of the optical filter may be attached to each other through an adhesive or an adhesive or may be laminated to each other by direct coating.
  • An optically transparent adhesive or an adhesive can be used as the said adhesive or an adhesive agent.
  • the optical filter may have excellent omnidirectional antireflection performance at the side as well as at the front.
  • the optical filter may have a reflectance of about 1% or less, measured from the front.
  • the optical filter may have a reflectance of less than 1%, 0.8% or less, 0.6% or less, 0.5% or less, or 0.4% or less, measured from a 60 degree side with respect to the front surface.
  • the reflectance may be a reflectance of light of any wavelength in the visible region, for example, a reflectance of light of any wavelength in the range of 380 nm to 780 nm, or a reflectance of light belonging to the entire visible region.
  • the reflectance may be, for example, a reflectance measured at the polarizer side of the optical filter.
  • the reflectance in the 60 degree side means the minimum reflectance among the reflectances measured in the full orientation of 0 degree to 360 degrees in the 60 degree side, or means all the reflectances measured in the full orientation of 0 degrees to 360 degrees, or 0 degrees to 360 degrees.
  • the average reflectance of the reflectance measured in all directions can be referred to.
  • the optical filter of the present application can prevent reflection of external light, thereby improving visibility of the organic light emitting device.
  • Incident unpolarized light (hereinafter referred to as “external light”) incident from the outside passes through the polarizer and transmits only one of the two polarization orthogonal components, that is, the first polarization orthogonal component, and is polarized.
  • the light may be converted into circularly polarized light while passing through the first retardation film.
  • the circularly polarized light is reflected from the display panel of the organic light emitting diode display including the substrate, the electrode, and the like, and the rotation direction of the circularly polarized light is changed, and the circularly polarized light passes through the first retardation film again, and thus, among the two polarized orthogonal components.
  • Is converted into another polarization orthogonal component that is, a second polarization orthogonal component. Since the second polarized orthogonal component does not pass through the polarizer and no light is emitted to the outside, the second polarized orthogonal component may have an external light reflection preventing effect.
  • the optical filter of the present application can effectively prevent reflection of external light incident from the side, the side visibility of the organic light emitting device can be improved. For example, it is possible to effectively prevent reflection of external light incident from the side through the viewing angle polarization compensation principle.
  • the optical filter of the present application can be applied to organic bales and devices.
  • 5 is a cross-sectional view illustrating the organic light emitting device by way of example.
  • the organic light emitting device includes an organic light emitting display panel 200 and an optical filter 100 disposed on one surface of the organic light emitting display panel 200.
  • the first retardation film 30 of the optical filter may be disposed adjacent to the organic light emitting display panel 200 as compared to the polarizer 10.
  • the organic light emitting display panel may include a base substrate, a lower electrode, an organic emission layer, an upper electrode, and an encapsulation substrate.
  • One of the lower electrode and the upper electrode may be an anode and the other may be a cathode.
  • the anode may be made of a conductive material having a high work function as an electrode into which holes are injected, and the cathode may be made of a conductive material having a low work function as an electrode into which electrons are injected.
  • At least one of the lower electrode and the upper electrode may be made of a transparent conductive material through which emitted light can come out, and may be, for example, ITO or IZO.
  • the organic light emitting layer may include an organic material that emits light when a voltage is applied to the lower electrode and the upper electrode.
  • An auxiliary layer may be further included between the lower electrode and the organic light emitting layer and between the upper electrode and the organic light emitting layer.
  • the auxiliary layer may include a hole transporting layer, a hole injecting layer, an electron injecting layer, and an electron transporting layer to balance electrons and holes.
  • the encapsulation substrate may be made of glass, metal, and / or polymer, and may encapsulate the lower electrode, the organic emission layer, and the upper electrode to prevent the inflow of moisture and / or oxygen from the outside.
  • the optical filter 100 may be disposed on a side from which light is emitted from the organic light emitting display panel.
  • the bottom emission structure may be disposed outside the base substrate.
  • the bottom emission structure may be disposed outside of the encapsulation substrate.
  • the optical filter 100 may improve display characteristics of the organic light emitting device by preventing external light from being reflected outside the organic light emitting device by being reflected by a reflective layer made of metal such as electrodes and wirings of the organic light emitting display panel 200. .
  • the optical filter 100 may exhibit an anti-reflection effect not only in the front but also in the side as described above, the side visibility may be improved.
  • the optical filter of the present application is excellent in the omnidirectional antireflection performance from the front as well as the side, the optical filter can be applied to the organic light emitting device to improve the visibility.
  • FIG. 1 is an exemplary cross-sectional view of an optical filter according to an embodiment of the present application.
  • FIG. 2 is an exemplary cross-sectional view of an optical filter to which a rod-shaped liquid crystal molecule is applied.
  • FIG 3 is an exemplary cross-sectional view of an optical filter to which disk-shaped liquid crystal molecules are applied.
  • FIG. 4 is an exemplary cross-sectional view of an optical filter applying a C-plate.
  • FIG. 5 is a cross-sectional view of the organic foot and the device according to an embodiment of the present application.
  • FIG. 6 is a simulation evaluation result of the optical filter of Comparative Example 1.
  • FIG. 7 is a simulation evaluation result of the optical filter of Example 1.
  • FIG. 8 is a simulation evaluation result of the optical filter of Example 2.
  • the polarizer had an absorption axis in one direction, had a single transmittance (Ts) of 42.5%, and had a laminated structure of a triacyl cellulose (TAC) film having no phase difference.
  • the second retardation film contained a rod-shaped liquid crystal molecule having a refractive index anisotropy ( ⁇ n) of 0.08 and was set to have an optical axis inclined constantly along the thickness direction (Constant Tilt Film).
  • the projection to the plane of the optical axis of the second retardation film was set to be in parallel with the absorption axis of the polarizer (0 degrees).
  • the first retardation film had an in-plane optical axis, and was set such that the Rin value was 137 nm and the R (450) / R (550) was 0.77 for light having a wavelength of 550 nm.
  • the optical axis of the first retardation film was set to form 45 degrees with the absorption axis of the polarizer. Table 1 below shows the results of simulation evaluation of the thickness of the second retardation film having a front reflectance of 1% or less according to the inclination angle of the optical axis of the second retardation film.
  • Table 1 shows the results of simulation evaluation of the minimum reflectance and the thickness of the second retardation film in that case among the reflectances measured in all directions of 0 to 360 degrees from the 60 degree side with respect to the front side.
  • the reflectance is the value measured at the polarizer side for the 550 nm wavelength.
  • Thickness ( ⁇ m) of the second retardation film having a front reflectance of 1% or less 60 degree side Minimum reflectance (%) Thickness ( ⁇ m) 25 - 0.98 1.25 30 0.82 to 1.7 0.65 1.25 35 0.7 to 1.8 0.38 1.3 40 0.62 to 1.84 0.25 1.3 45 0.6 to 1.84 0.25 1.2 50 0.6 to 1.75 0.32 1.15 55 0.6 to 1.55 0.58 1.1 60 0.5 to 1.3 0.9 0.9 65 - 1.2 0.7
  • Simulation evaluation was performed in the same manner as in Simulation 1 except that the second retardation film was set to include rod-shaped liquid crystal molecules having refractive index anisotropy ( ⁇ n) of 0.12, and the results are shown in Table 2 below.
  • Thickness ( ⁇ m) of the second retardation film having a front reflectance of 1% or less 60 degree side Minimum reflectance (%) Thickness ( ⁇ m) 25 -
  • Simulation evaluation was prepared in the same manner as in Simulation 1 except that the second retardation film was set to include rod-shaped liquid crystal molecules having refractive index anisotropy ( ⁇ n) of 0.05, 0.08, 0.12 and 0.25, respectively.
  • Table 3 shows the results of simulation evaluation of the minimum reflectance measured in the lateral direction of 60 degrees from the front and the thickness of the second retardation film in that case according to the inclination angle and the refractive index anisotropy of the optical axis of the second retardation film.
  • the simulation evaluation was performed in the same manner as in the simulation evaluation 1 except that the second retardation film was set to include disc-shaped liquid crystal molecules having refractive index anisotropy ( ⁇ n) of ⁇ 0.08, and the results are shown in Table 4 below. .
  • Thickness ( ⁇ m) of the second retardation film having a front reflectance of 1% or less 60 degree side Minimum reflectance (%) Thickness ( ⁇ m) 10 - 1.2 2.9 15 1.9 to 3.0 0.78 2.7 20 1.58 to 2.95 0.5 2.6 25 1.5 to 2.8 0.45 2.5 30 1.5 to 2.6 0.55 2.2 35 - 1.1 2.0
  • the simulation evaluation was performed in the same manner as in the simulation evaluation 1 except that the second retardation film was set to include disk-shaped liquid crystal molecules having refractive index anisotropy ( ⁇ n) of -0.12, and the results are shown in Table 5 below. .
  • Thickness ( ⁇ m) of the second retardation film having a reflectance of 1% or less from the front side 60 degree side Minimum reflectance (%) Thickness ( ⁇ m) 10 - 1.15 2.15 15 1.37 to 2.12 0.8 2.95 20 1.12 to 2.05 0.55 1.85 25 1.05 to 1.93 0.5 1.7 30 1.22 to 1.72 0.55 1.5 35 - 1.1 1.3
  • a polarizer, a second retardation film (containing a rod-shaped liquid crystal molecule having a refractive index anisotropy of 0.12, a constant tilt film having a thickness of 0.9 ⁇ m and a tilt angle of 45 °), a first retardation film, and a reflecting plate are disposed in this order.
  • the structure was set to Example 1.
  • the polarizer of Example 1 has a structure in which a TAC film having no phase difference is laminated.
  • a polarizer, a second retardation film (containing a disc-shaped liquid crystal molecule having a refractive index anisotropy of -0.12 and a constant tilt film having a thickness of 1.2 ⁇ m and a tilt angle of 25 °), a first retardation film, and a reflecting plate are disposed in this order.
  • the structure was set to Example 2.
  • the polarizer of Example 2 has a structure in which a TAC film having a thickness direction retardation Rth of ⁇ 30 nm is laminated.
  • a polarizer, a second retardation film (a constant tilt film having a disc-shaped liquid crystal molecule having a refractive index anisotropy of ⁇ 0.01, having a thickness of 2.1 ⁇ m, and having an inclination angle of 30 °), a first retardation film, and a reflecting plate in that order
  • a reflecting plate a reflecting plate having a reflectance of 100% in all the electric fields of visible light was used. Five samples were set so that the angle which the projection to the optical axis plane of a 2nd phase difference film makes with the absorption axis of a polarizer is 0 degree, 4 degree, 8 degree, 12 degree, and 16 degree, respectively.
  • first retardation film 20 second retardation film 30: polarizer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention se rapporte à un filtre optique et à un dispositif électroluminescent organique. Le filtre optique pour antireflet comprend séquentiellement : un premier film à différence de phase ayant un axe optique dans le plan et des propriétés de retard de phase de longueur d'onde de 1/4 ; un second film à différence de phase ayant un axe optique incliné de manière fixe dans la direction de l'épaisseur ; un polariseur ayant un axe d'absorption formé dans une direction. Par conséquent, la visibilité peut être améliorée par application du filtre optique de la présente invention dans le dispositif électroluminescent organique.
PCT/KR2018/001126 2017-01-25 2018-01-25 Filtre optique pour antireflet et dispositif électroluminescent organique WO2018139875A1 (fr)

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JP2019540411A JP7055425B2 (ja) 2017-01-25 2018-01-25 反射防止用光学フィルタおよび有機発光装置
CN201880008251.0A CN110235029B (zh) 2017-01-25 2018-01-25 用于抗反射的滤光器和有机发光器件
EP18744109.2A EP3575836B1 (fr) 2017-01-25 2018-01-25 Filtre optique pour antireflet et dispositif électroluminescent organique
US16/480,642 US10943960B2 (en) 2017-01-25 2018-01-25 Optical filter for anti-reflection and organic light-emitting device

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090122138A (ko) 2008-05-22 2009-11-26 주식회사 엘지화학 유기발광소자용 휘도 향상 편광판
KR20130016135A (ko) * 2011-08-05 2013-02-14 주식회사 엘지화학 광학 필름
KR20150055210A (ko) * 2013-11-12 2015-05-21 삼성전자주식회사 보상 필름, 광학 필름 및 표시 장치
US20150168778A1 (en) * 2013-12-18 2015-06-18 Samsung Display Co., Ltd. Liquid crystal display
KR20160001657A (ko) * 2014-06-27 2016-01-06 삼성전자주식회사 광학 필름, 그 제조 방법 및 표시 장치
KR20160142798A (ko) * 2016-11-28 2016-12-13 삼성전자주식회사 다층형 광학 필름 및 이를 포함하는 유기 발광 표시 장치
KR20170011940A (ko) 2015-07-22 2017-02-02 삼성전자주식회사 멀티 모드 가변형 증폭기 및 이를 포함하는 아날로그 필터

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090122138A (ko) 2008-05-22 2009-11-26 주식회사 엘지화학 유기발광소자용 휘도 향상 편광판
KR20130016135A (ko) * 2011-08-05 2013-02-14 주식회사 엘지화학 광학 필름
KR20150055210A (ko) * 2013-11-12 2015-05-21 삼성전자주식회사 보상 필름, 광학 필름 및 표시 장치
US20150168778A1 (en) * 2013-12-18 2015-06-18 Samsung Display Co., Ltd. Liquid crystal display
KR20160001657A (ko) * 2014-06-27 2016-01-06 삼성전자주식회사 광학 필름, 그 제조 방법 및 표시 장치
KR20170011940A (ko) 2015-07-22 2017-02-02 삼성전자주식회사 멀티 모드 가변형 증폭기 및 이를 포함하는 아날로그 필터
KR20160142798A (ko) * 2016-11-28 2016-12-13 삼성전자주식회사 다층형 광학 필름 및 이를 포함하는 유기 발광 표시 장치

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
B. KOHNE ET AL., ANGEW. CHEM., vol. 96, 1984, pages 70
C. DESTRADE ET AL., MOL. CRYST., vol. 71, 1981, pages 111
J. ZHANG ET AL., J. AM. CHEM. SOC., vol. 116, 1994, pages 2655

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