WO2012064137A2 - Film de cristaux liquides - Google Patents

Film de cristaux liquides Download PDF

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Publication number
WO2012064137A2
WO2012064137A2 PCT/KR2011/008588 KR2011008588W WO2012064137A2 WO 2012064137 A2 WO2012064137 A2 WO 2012064137A2 KR 2011008588 W KR2011008588 W KR 2011008588W WO 2012064137 A2 WO2012064137 A2 WO 2012064137A2
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WIPO (PCT)
Prior art keywords
liquid crystal
layer
group
clc
substrate
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PCT/KR2011/008588
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English (en)
Korean (ko)
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WO2012064137A3 (fr
Inventor
이대희
장준원
박문수
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201180054379.9A priority Critical patent/CN103210327B/zh
Priority to US13/521,703 priority patent/US8962103B2/en
Priority to JP2013538647A priority patent/JP5903724B2/ja
Priority claimed from KR1020110117225A external-priority patent/KR101251248B1/ko
Publication of WO2012064137A2 publication Critical patent/WO2012064137A2/fr
Publication of WO2012064137A3 publication Critical patent/WO2012064137A3/fr

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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
    • G02B5/3016—Polarising elements involving passive liquid crystal 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Definitions

  • TECHNICAL FIELD This invention relates to a liquid crystal film, a manufacturing method of a liquid crystal film, an optical element, and a liquid crystal display (LCD).
  • the liquid crystal display may include a liquid crystal panel and polarizing plates disposed on upper and lower sides of the liquid crystal panel, and may include various functional optical elements in addition to the polarizing plate.
  • an image may be displayed by changing the alignment of the liquid crystal for each pixel of the liquid crystal panel.
  • a light source such as a BLU (Backlight unit) is usually placed on the rear surface of the lower polarizing plate of the liquid crystal panel, and the light emitted from the light source is transmitted to the panel to display an image. .
  • An object of this invention is to provide a liquid crystal film, the manufacturing method of a liquid crystal film, an optical element, and LCD.
  • the present invention relates to a liquid crystal film (LCF), and an exemplary liquid crystal film may include a liquid crystal layer (hereinafter referred to as "CLC layer”) including a cholesteric oriented liquid crystal region.
  • LCD layer liquid crystal layer
  • An exemplary method for manufacturing a liquid crystal film of the present invention includes forming a liquid crystal layer comprising a cholesteric oriented liquid crystal region, wherein the liquid crystal region is a spiral axis of the waveguide of the cholesteric liquid crystal molecules. Forming a liquid crystal layer to include a liquid crystal layer having a cholesteric alignment region oriented parallel to the thickness direction of the layer and the cholesteric alignment region oriented such that the spiral axis is not parallel to the thickness direction of the liquid crystal layer. do.
  • Exemplary optical elements of the present invention include the liquid crystal film; And a ⁇ / 4 wavelength layer formed on the liquid crystal layer of the liquid crystal film.
  • An exemplary liquid crystal display of the present invention may include the optical element.
  • the exemplary liquid crystal film of the present invention can be used as a reflective polarizing plate capable of improving the light utilization efficiency of display devices such as LCDs and improving luminance.
  • the liquid crystal film includes a homeotropic or focal conic oriented CLC region inside the liquid crystal layer to maximize the brightness enhancement effect and to effectively reproduce the color coordinates of the light source, thereby providing excellent image quality.
  • the branch may provide a display device.
  • 1 is an exemplary diagram for explaining the CLC.
  • FIG. 2 is an exemplary diagram for explaining the orientation of the CLC.
  • FIG. 4 is a diagram illustrating an exemplary liquid crystal film.
  • 5-12 is a figure which shows an exemplary optical element.
  • FIG. 13 is a diagram illustrating an exemplary LCD.
  • polarizer 132 liquid crystal panel
  • the present invention relates to a liquid crystal film (LCF).
  • An exemplary liquid crystal film includes a liquid crystal layer (hereinafter, "CLC layer") containing a cholesteric oriented liquid crystal region.
  • the liquid crystal region is a cholesteric oriented liquid crystal region having a spiral structure in which a director of liquid crystal molecules is twisted along a helical axis to form a layer, and the CLC layer is a liquid crystal as described above. Include at least two areas.
  • the liquid crystal region comprises: a cholesteric oriented liquid crystal region in which the spiral axis of the region is formed parallel to the thickness direction of the CLC layer; And a cholesteric oriented liquid crystal region which is formed such that the spiral axis of the region is not parallel to the thickness direction of the CLC layer.
  • the term “thickness direction of the CLC layer” may refer to a direction parallel to an imaginary line connecting one main surface of the CLC layer and the main surface opposite thereto at the shortest distance.
  • the thickness direction of the CLC layer is the substrate on which the CLC layer is formed. It may be a direction parallel to the virtual line formed in a direction perpendicular to the plane of the.
  • 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 CLC layer includes a cholesteric oriented liquid crystal region.
  • cholesteric liquid crystal or cholesteric oriented liquid crystal may be abbreviated as "CLC”.
  • the CLC has a spiral structure in which waveguides (n in FIG. 1) of liquid crystal molecules are oriented in layers while being twisted along a spiral axis (X in FIG. 1).
  • the distance (P in FIG. 1) until the waveguide of the liquid crystal molecules completes the rotation of 360 degrees is referred to as "pitch”.
  • the term "liquid crystal region or CLC region” may refer to a region where the waveguide of the CLC completes a 360 degree rotation.
  • each CLC region may be classified according to the orientation form or angle with respect to the thickness direction of the CLC layer of the spiral axis of the region or the center wavelength of the reflected light of each liquid crystal region.
  • the CLC can selectively reflect light of circular polarization.
  • the wavelength of the light reflected by the CLC depends on the refractive index and pitch of the liquid crystal.
  • Spiral distortion of the CLC waveguide results in spatially periodic deformation in the dielectric tensor of the material, which causes wavelength selective reflection of light.
  • Bragg reflection occurs when the wavelength ⁇ is in the range of the following general formula (1) for light propagating along the spiral axis.
  • Equation 1 P is the pitch of the CLC region, N e represents the refractive index of the CLC for light polarized parallel to the waveguide of the CLC, N o is CLC for light polarized perpendicular to the waveguide of the CLC The refractive index of is shown.
  • center wavelength ⁇ 0 of the wavelength range of the light reflected by the CLC can be approximated by the following general formula (2).
  • the spectral width ⁇ 0 of the light reflected by the CLC can be approximated by the following general formula (3).
  • the liquid crystal region of the CLC layer includes a CLC region having a spiral axis in a direction parallel to the thickness direction of the CLC layer and a CLC region having a spiral axis in a direction not parallel to the thickness direction of the CLC layer.
  • the CLC region typically includes CLC molecules that are rotating in a helical fashion, such that the waveguides of the CLC molecules, for example, the helix axis of the long axis of the CLC molecules, are parallel to the thickness direction of the CLC layer.
  • the spiral axis HA of the CLC is oriented parallel to the thickness direction 21 of the CLC layer.
  • the direction 22 perpendicular to the thickness direction 21 may mean, for example, the plane direction of the substrate as described above.
  • the CLC region in which the spiral axis is oriented in parallel with the thickness direction of the CLC layer may be referred to as a planar oriented CLC region.
  • the spiral axis of the waveguide of the CLC molecules can be aligned in a direction that is not parallel to the thickness direction of the CLC layer.
  • the spiral axis HA of the CLC is oriented in a direction perpendicular to the thickness direction 21 of the CLC layer, or as shown in C of FIG. 2, the spiral axis of the CLC.
  • the orientation may be made while (HA) forms a direction other than the direction perpendicular to and parallel to the thickness direction 21 of the CLC layer.
  • the CLC region in which the spiral axis is oriented perpendicular to the thickness direction of the CLC layer is referred to as a homeotropic oriented CLC region, and the spiral axis is perpendicular to the thickness direction of the CLC layer.
  • the CLC region oriented in a direction other than the parallel direction may be referred to as a focal conic oriented CLC region.
  • the CLC region is oriented with the spiral axis parallel to the thickness direction of the CLC layer.
  • the CLC layer of the liquid crystal film includes a CLC region in which the spiral axis is formed in a direction other than parallel to the thickness direction of the CLC layer.
  • the CLC region in which the spiral axis is formed in a direction other than parallel to the thickness direction of the CLC layer may, for example, scatter or diffuse light incident on the CLC layer, thereby further improving luminance and viewing angle characteristics of the liquid crystal film. Can be.
  • the amount, position or distribution state in the CLC layer of the homeotropic or focal conic oriented CLC region, or the angle at which the spiral axis forms the thickness direction of the CLC layer in the focal conic orientation is not particularly limited.
  • the homeotropic or focal cotic oriented CLC region may be formed and arranged so that the haze of the CLC layer, which is caused by the CLC layer scattering or diffusing light due to the region, is in a predetermined range. have.
  • the CLC layer comprising such a homeotropic or focal cotic oriented CLC region may have a haze value of at least 5%, at least 10%, or at least 15%.
  • the haze of the CLC layer may be selected to exert the most suitable effect in each application according to the use to which the liquid crystal film is applied.
  • the haze of the CLC layer may be measured according to a manufacturer's manual using a hazemeter such as Sepung's HR-100 or HM-150.
  • the upper limit of the haze of the CLC layer is not particularly limited, and for example, the upper limit may be about 30%, 25%, or 20%.
  • the CLC layer may further include at least two or more types of CLC regions having different center wavelengths of reflected light.
  • the CLC layer including the two or more types of CLC regions may be a single layer.
  • the single layer CLC layer does not include a CLC layer formed by stacking or attaching two or more CLC layers, or a CLC layer formed by coating the CLC composition a plurality of times to form the CLC layer.
  • the CLC layer including two or more CLC regions is formed as a single layer as described above, it is possible to prevent reflection loss of light due to the interlayer interface while securing selective reflection characteristics in a wider wavelength band with a thinner thickness.
  • a single layer CLC layer including two or more types of CLC regions having different center wavelengths of reflected light as described above may be referred to as a CLC layer having broadband characteristics.
  • Each CLC region classified according to the center wavelength of the reflected light may be a planner, homeotropic or focal conic oriented CLC region.
  • the distribution of each of the CLC regions is not particularly limited.
  • the CLC regions may be arranged such that the center wavelength is sequentially changed from a long wavelength to a short wavelength or a short wavelength to a long wavelength along the thickness direction of the CLC layer, or the center wavelength is sequentially shortened and then increased again or sequentially. It may be arranged in a direction of increasing length and decreasing again, or may be arranged so that the center wavelength varies irregularly along the thickness direction of the CLC layer.
  • the CLC layer may include a CLC region in which a central wavelength of reflected light belongs to a red light region of visible light; A CLC region in which the central wavelength of the reflected light belongs to the green light region of visible light; And a CLC region in which the central wavelength of the reflected light belongs to the blue light region.
  • FIG. 3 is a schematic diagram schematically illustrating the CLC layer 2.
  • the central wavelength of the reflected light is red in the direction from one main surface 21 side of the CLC layer 2 to the other main surface 22 side.
  • the CLC region 231 belonging to the category of) light, the CLC region 232 belonging to the category of green light, and the CLC region 233 belonging to the category of blue light are sequentially arranged.
  • the CLC layer includes a first region having a center wavelength of reflected light of 400 nm to 500 nm, a second region having a center wavelength of reflected light of 500 nm to 600 nm, and a third region having a center wavelength of reflected light of 600 nm to 700 nm. It may include at least.
  • the first to third regions may be arranged in a direction in which the center wavelength is sequentially increased or decreased along the thickness direction of the CLC layer, but is not limited thereto.
  • the center wavelength of the reflected light in the above for example, can be measured based on the general formula (2), the method of measuring the center wavelength is well known in this field.
  • the CLC layer may include a liquid crystal polymer.
  • Exemplary CLC layers are prepared by coating a composition comprising a crosslinkable or polymerizable liquid crystal compound and a chiral agent, and polymerizing or crosslinking the composition in a state where a spiral pitch is induced by the chiral agent.
  • the CLC layer may include a cross-linked or polymerized liquid crystal polymer.
  • the chiral agent may be crosslinkable or polymerizable, non-crosslinkable or nonpolymerizable.
  • One exemplary CLC layer may include a compound represented by the following Formula 1 in a crosslinked or polymerized form.
  • A is a single bond, -COO-, or -OCO-
  • R 1 to R 10 are each independently hydrogen, halogen, alkyl group, alkoxy group, cyano group, nitro group, -OQP or Wherein at least one of R 1 to R 10 is -OQP or a substituent of Formula 2, wherein Q is an alkylene group or an alkylidene group, and P is an alkenyl group, an epoxy group, a cyano group, a carboxyl group, or an acryl It is a diary, methacryloyl group, acryloyloxy group, or methacryloyloxy group.
  • B is a single bond, -COO-, or -OCO-
  • R 11 to R 15 are each independently hydrogen, halogen, alkyl group, alkoxy group, cyano group, nitro group, or -OQP
  • R 11 to At least one of R 15 is -OQP, wherein Q is an alkylene group or an alkylidene group, and P is an alkenyl group, epoxy group, cyano group, carboxyl group, acryloyl group, methacryloyl group, acryloyloxy group or It is a methacryloyloxy group.
  • single bond refers to a case where no separate atom is present in a portion represented by A or B.
  • A is a single bond in Formula 1
  • benzene on both sides of A may be directly connected to form a biphenyl structure.
  • alkyl group in Formulas 1 and 2 a straight or branched chain alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, or 3 to 20 carbon atoms and 3 to 16 carbon atoms Or a cycloalkyl group having 4 to 12 carbon atoms.
  • the alkyl group may be optionally substituted with one or more substituents.
  • an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms may be exemplified.
  • the alkoxy group may be linear, branched or cyclic.
  • the alkoxy group may be optionally substituted with one or more substituents.
  • alkylene group or the alkylidene group in the formula (1) and 2 an alkylene group or alkylidene group having 1 to 12 carbon atoms, 4 to 10 carbon atoms or 6 to 9 carbon atoms may be exemplified.
  • the alkylene group or alkylidene group may be linear, branched or cyclic.
  • the alkylene group or alkylidene group may be optionally substituted with one or more substituents.
  • alkenyl group in Chemical Formulas 1 and 2 an alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms may be exemplified.
  • the alkenyl group may be linear, branched or cyclic.
  • the alkenyl group may be optionally substituted with one or more substituents.
  • Examples of the substituent that may be substituted with an alkyl group, alkoxy group, alkenyl group, alkylene group or alkylidene group include alkyl, alkoxy, alkenyl, epoxy, cyano, carboxyl, acryloyl, methacryloyl, Acryloyloxy group, methacryloyloxy group or an aryl group may be exemplified, but is not limited thereto.
  • P is preferably acryloyl group, methacryloyl group, acryloyloxy group or methacryloyloxy group, more preferably acryloyloxy group or methacryloyloxy group, More preferably, it may be an acryloyloxy group.
  • At least one or more residues of -OQP or formula (2) in Formulas (1) and (2) may be, for example, present at a position of R 3 , R 8, or R 13 , for example, 1 or 2 There may be dogs.
  • a substituent other than -OQP or the residue of Formula 2 is, for example, hydrogen, halogen, a straight or branched chain alkyl group having 1 to 4 carbon atoms, and a cycloalkyl having 4 to 12 carbon atoms.
  • It may be an alkyl group, a cyano group, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, preferably chlorine, a straight or branched chain alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, and 1 to 4 carbon atoms. It may be an alkoxy group or cyano group.
  • the chiral agent that can be included in the CLC layer is particularly limited as long as it can induce a desired spiral pitch without impairing the liquid crystallinity of the liquid crystal polymer or the liquid crystal compound, for example, nematic regularity. Can be used without it.
  • the chiral agent for causing the spiral pitch in the liquid crystal needs to include at least chirality in the molecular structure.
  • the chiral agent for example, compounds having one or two or more asymmetric carbons, compounds having asymmetric points on heteroatoms such as chiral amines or chiral sulfoxides, or cumulene Or a compound having an axially asymmetric, optically active site with an axial agent such as binaphthol.
  • the chiral agent may be, for example, a low molecular weight compound having a molecular weight of 1,500 or less.
  • a commercially available chiral nematic liquid crystal for example, a chiral dopant liquid crystal S-811 commercially available from Merck or LC756 of BASF may be used.
  • the CLC layer may have a thickness of 3 ⁇ m to 8 ⁇ m or 4 ⁇ m to 6 ⁇ m.
  • the thickness of the CLC layer in the above range, it is possible to effectively form a homeotropic or focal conic oriented CLC region in the CLC layer, and also to allow the film to be effectively applied in various applications.
  • the liquid crystal film may further include a substrate, and the CLC layer may be formed on at least one surface of the substrate.
  • FIG. 4 is sectional drawing which shows the exemplary liquid crystal film 4, and shows the case where CLC layer 41 as mentioned above is formed in the upper part of the base material 42. As shown in FIG.
  • the substrate various kinds of substrates may be used.
  • the substrate may be an optically anisotropic substrate or a polarizer such as an optically isotropic substrate, a retardation layer, or the like.
  • Plastic substrates include cellulose substrates such as diacetyl cellulose (DAC) or triacetyl cellulose (TAC) substrates; Cyclo olefin copolymer (COP) substrates such as norbornene derivative resin substrates; Acrylic substrates such as poly (methyl methacrylate) substrate; polycarbonate (PC) substrate; olefin substrates such as polyethylene (PE) or polypropylene (PP) substrate; polyvinyl alcohol (PVA) substrate; poly ether sulfone (PES) substrate; PEEK (polyetheretherketone) substrates; PEI (polyetherimide) substrates; PEN (polyethylenenaphthatlate) substrates; polyester substrates such as polyethylene terephtalate (PET) substrates; PI (polyimide) substrates; PSF (polysulfone) substrates; PAR (polyarylate) substrates or
  • the phase retardation layer for example, the phase retardation layer, a ⁇ / 4 wavelength layer or a ⁇ / 2 wavelength layer or the like may be used.
  • ⁇ / 4 wavelength layer means an optical element capable of retarding incident light by a quarter wavelength of the wavelength
  • ⁇ / 2 wavelength layer denotes incident light. It may mean an optical element capable of delaying the phase by half the wavelength.
  • the phase retardation layer as described above may be a liquid crystal polymer layer formed by orienting and polymerizing a polymerizable liquid crystal compound, or may be a plastic film provided with birefringence by a stretching or shrinking process.
  • the phase retardation layer may be a plastic film imparted with birefringence by oblique stretching, for example, a diagonally stretched COP film and the like.
  • polarizing element conventional elements known in the art may be used.
  • an element manufactured by adsorbing and orienting a dichroic dye or the like to a polyvinyl alcohol resin may be used as the polarizing element.
  • the homeotropic or focal conic oriented CLC region is preferably distributed in the substrate-side direction in the CLC layer.
  • homeotropic or focal conic oriented CLC regions are oriented to have a predetermined thickness from the substrate side of the CLC layer, layering in a direction parallel to the top surface of the substrate, Other regions may have planar oriented CLC regions.
  • the side on which the at least CLC layer of the substrate is formed may be hydrophilic.
  • the surface on which the at least CLC layer of the substrate is formed may have a wetting angle of 0 to 50 degrees, 0 to 40 degrees, 0 to 30 degrees, 0 to 20 degrees or 0 degrees to 10 degrees, or 10 degrees to 50 degrees, 20 degrees to 50 degrees, 30 degrees to 50 degrees or so. If the CLC layer is formed on the surface of the substrate having the wet angle in this range, the homeotropic or focal conic oriented CLC regions can be appropriately formed.
  • the method of measuring the wet angle with respect to the water of the substrate in the above is not particularly limited, it is possible to use a method of measuring the wet angle known in the art, for example, using a DSA100 device manufactured by KRUSS, Can be measured according to the manual.
  • hydrophilization may be performed to the surface of a base material, or the base material containing a hydrophilic functional group may be used as a base material.
  • various hydrophilic treatment methods capable of controlling the wetting angle of the substrate in the above range, and various substrates having the same wetting angle are known.
  • the hydrophilization treatment corona treatment, plasma treatment or alkali treatment can be exemplified. Therefore, in one example, the corona treatment layer, the plasma treatment layer, or the alkali treatment layer may be formed on the surface of the substrate.
  • the alignment of the CLC layer or the helical axis of the oriented CLC region can be achieved in a desired range without using an alignment film that is commonly used for the alignment of the CLC layer.
  • a known alignment film such as a rubbing alignment film or a polymer alignment film may be formed on the surface on which the CLC layer of the substrate is formed.
  • the substrate included in the liquid crystal film may be subjected to appropriate surface treatment.
  • the surface treated layer may be a surface treated surface having a dimple pattern. Accordingly, a dimple pattern may be formed on the substrate.
  • the method of forming the dimple pattern is not particularly limited, and for example, an appropriate embossing process may be performed in the manufacturing process of the substrate, or the curable resin composition may be coated on the substrate, and may be cured in contact with a mold. It can be formed by giving a concave-convex structure or blending an appropriate bead to the curable resin composition, coating it on a substrate and curing it.
  • the substrate when using the curable resin composition in the above manner, when using a composition that can be cured to form a hard cured layer, the substrate is provided with excellent wear resistance and scratch resistance, and furthermore, at high temperature and / or high humidity conditions. It is possible to have dimensional stability under the same harsh conditions.
  • the resin that can be used for example, various room temperature curing type, moisture curing type, thermosetting type or photocurable resin composition may be used, and thus the dimple pattern may be used.
  • Silver may contain the above-mentioned resin composition in the hardened state.
  • a thermosetting or photocurable resin composition more preferably a photocurable resin composition can be used.
  • the "cured state" in the above may mean a case where the components contained in the resin composition are converted to a hard state through a crosslinking reaction, a polymerization reaction, or the like.
  • the cured state as described above is induced at room temperature, or in the presence of suitable moisture, by the application of heat or irradiation of electromagnetic waves such as ultraviolet rays. It can mean a composition that can be.
  • the resin composition may include an acrylic compound, an epoxy compound, a urethane compound, a phenol compound or a polyester compound as a main material.
  • the "compound” may be a monomeric, oligomeric or polymeric compound.
  • an acrylic resin composition which is excellent in optical properties such as transparency and excellent in resistance to yellowing and the like, preferably an ultraviolet curable acrylic resin composition can be used.
  • the ultraviolet curable acrylic resin composition may include an acrylate oligomer and a monomer for dilution, and if necessary, polyfunctional acrylate may be used as the monomer for dilution to secure hardness.
  • the acrylate oligomers include urethane acrylate, epoxy acrylate, ester acrylate, ether acrylate, and the like, and urethane acrylate may be preferably used.
  • Various acrylate oligomers are known in the art for preparing UV curable compositions, and in the present invention, such compounds may be appropriately selected.
  • the type of diluent monomer that can be used in the preparation of the UV-curable acrylic resin composition is also variously known in the art, and one preferred example thereof may include a multifunctional acrylate, but the type of the diluent monomer is limited to the above. It doesn't happen.
  • Examples of the multifunctional acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentylglycol di (meth) acrylate, polyethylene glycol di (meth) Acrylate, neopentylglycol adipate di (meth) acrylate, hydroxyl promisvalic acid neopentylglycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate , Caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate, di (meth) acryloxy ethyl isocyanurate, allylated cyclohexyl di (meth) acrylic Rate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentane di (meth) acrylate, ethylene oxide
  • the selection of the above components or the blending ratio of the selected components for producing the UV-curable acrylic resin composition is not particularly limited and may be adjusted in consideration of the hardness and other physical properties of the desired resin layer.
  • light-scattering beads can be used preferably.
  • the term "light scattering beads” refers to beads having a refractive index different from that of the resin layer, for example, the cured state described above, and capable of scattering light incident in the resin layer therein.
  • the light scattering beads, the difference in refractive index with the resin layer may be 0.03 or less, preferably 0.02 to 0.2.
  • the shape of the light scattering beads is not particularly limited and may be, for example, spherical, oval, polyhedral, amorphous, or any other shape.
  • the beads or light scattering beads preferably have an average diameter of 50 nm to 5,000 nm.
  • the bead or light scattering beads having irregularities formed on the surface specifically, the average surface roughness (Rz) is 10 nm to 50 nm, preferably 20 nm to 40 nm Bead or light scattering beads having a maximum height of irregularities formed on the surface of about 100 nm to 500 nm, preferably 200 nm to 400 nm, and a width of irregularities between 400 nm and 1,200 nm, preferably 600 nm to 1,000 nm Can be used.
  • the intended scattering effect and haze value It can be effectively secured.
  • the specific kind of light-scattering beads is not particularly limited as long as the above conditions are satisfied, and various inorganic or organic beads may be used, and inorganic beads may be preferably used.
  • inorganic beads include one selected from the group consisting of silica, amorphous titania, amorphous zirconia, indium oxide, alumina, amorphous zinc oxide, amorphous cerium oxide, barium oxide, calcium carbonate, amorphous barium titanate and barium sulfate
  • the organic beads include crosslinked or uncrosslinked materials of organic materials such as acrylic resins, styrene resins, urethane resins, melamine resins, benzoguanamine resins, epoxy resins, and silicone resins. It is not limited to this.
  • the content of the light scattering beads in the resin layer forming the dimple pattern is not particularly limited.
  • the content of the beads may be adjusted so that the resin layer properly forms a dimple pattern, and the haze value can be effectively controlled in consideration of the type of resin layer and the beads.
  • additives such as a polymerization initiator, a sunscreen or an absorber, an antistatic agent, or a dispersing agent, can be contained in the said resin composition suitably.
  • the specific shape of the dimple pattern is not particularly limited.
  • the pattern may be controlled to exhibit a haze value of about 15% or less.
  • the haze value as described above can be achieved by appropriately controlling the shape of the dimple pattern or by adjusting the refractive index or content of the beads in the resin layer forming the dimple pattern.
  • the substrate may be subjected to various surface treatments as necessary.
  • Examples of such surface treatment include low reflection treatment, anti-reflection treatment, anti-glare treatment, and high resolution anti-glare treatment, and one or more of the above treatments may be performed on the substrate.
  • the manner of performing each surface treatment in the above is not particularly limited, and various methods known in the art may be applied.
  • An exemplary method for producing a liquid crystal film may include forming a CLC layer including a CLC region.
  • the CLC region is cholesterically oriented so that the spiral axis of the waveguide of the CLC molecule is parallel to the thickness direction of the CLC layer, and the spiral axis is parallel to the thickness direction of the CLC layer. May be performed to include cholesteric oriented CLC regions.
  • the cholesterically oriented CLC region such that the spiral axis of the waveguide of the CLC molecule is not parallel to the thickness direction of the CLC layer may be the homeotropic or focal conic oriented CLC region described above.
  • the manner of forming the homeotropic or focal conic oriented CLC region is not particularly limited.
  • the cholesteric CLC layer is formed on the hydrophilic surface of the substrate having the aforementioned wet angle, or the CLC layer is formed.
  • blending an appropriate additive with the liquid crystal composition used for the purpose can be used.
  • the formation of the CLC layer may include forming the CLC on the surface of the substrate, which is a substrate having a wet angle of 0 degrees to 50 degrees, 0 degrees to 40 degrees, 0 degrees to 30 degrees, 0 degrees to 20 degrees, or 0 degrees to 10 degrees. Applying the composition and forming a CLC layer.
  • a substrate having the wet angle as described above a substrate having a suitable hydrophilization treatment on its surface, or a substrate having hydrophilicity from the beginning, including a hydrophilic functional group itself, can be used.
  • hydrophilization treatment corona treatment, plasma treatment or alkali treatment may be exemplified.
  • the processing conditions are not particularly limited.
  • Various schemes are known in the art for imparting hydrophilicity to a substrate, and the hydrophilization treatment can be performed such that the substrate exhibits the wet angle by employing the above scheme.
  • the CLC composition may be applied to a surface having the wet angle to form a CLC layer.
  • the term "CLC composition” may include any kind of composition that can be used to form a CLC layer including a liquid crystal region in a desired pattern.
  • the composition may include a nematic liquid crystal compound and a chiral agent.
  • the composition may further include an initiator or a crosslinking agent for polymerization or crosslinking of the compound represented by Formula 1.
  • Suitable polymerization initiators may include those capable of generating free radicals to initiate and propagate polymerization or crosslinking.
  • the free radical initiator can be selected according to, for example, stability or half life. Preferably, the free radical initiator does not generate additional color in the CLC layer by absorption or otherwise.
  • Free radical initiators are typically thermal free radical initiators or photoinitiators.
  • Thermal free radical initiators include, for example, peroxides, persulfates or azonitrile compounds. Free radical initiators generate free radicals upon thermal decomposition.
  • the photoinitiator may be activated by electromagnetic radiation or particle irradiation.
  • suitable photoinitiators may include onium salt photoinitiators, organometallic photoinitiators, cationic metal salt photoinitiators, photodegradable organosilanes, latent sulfonic acids, phosphine oxides, cyclohexyl phenylketones, amine substituted acetophenones and benzophenones have.
  • ultraviolet (UV) radiation may be used to activate the photoinitiator although other light sources may be used.
  • Photoinitiators can be selected based on the absorption of a particular wavelength of light.
  • the CLC composition can typically be part of a coating composition comprising one or more solvents.
  • the coating composition may include, for example, a dispersant, an antioxidant and an ozoneogenic agent.
  • the coating composition may include various dyes and pigments, if desired, to absorb ultraviolet, infrared or visible light. In some cases, it may be appropriate to add viscosity modifiers such as thickeners and fillers.
  • the CLC composition can be applied to the substrate, for example, by various liquid coating methods.
  • the CLC composition is crosslinked, polymerized, or converted to the CLC layer.
  • Such conversion may include evaporation of the solvent, heating to align the CLC material; Crosslinking or polymerization of the CLC composition; Or application of heat, for example actinic radiation; It can be accomplished by a variety of techniques, including irradiation of light such as ultraviolet, visible or infrared light and irradiation of electron beams, or combinations thereof, or curing of CLC compositions using similar techniques.
  • the CLC composition may include the compound of Formula 1, an initiator, and a chiral agent.
  • the initiator those capable of initiating polymerization or crosslinking of the compound of formula (1) can be selected.
  • an initiator for example, 2-methyl-1- [4- (methylthio) phenyl] -2- (4-morpholinyl) -1-propanone (2-methyl-1- [4] as a photoinitiator -(methylthio) phenyl] -2- (4-morpholinyl) -1-propanone), 2-dimethoxy-1,2-diphenylethan-1-one (2-dimethoxy-1,2-diphenylethan-1-one ), 1-hydroxy-cyclohexyl-phenyl-ketone, triaryl sulfonium hexafluoroantimonate salts and diphenyl (2,4, One or two or more selected from 6-trimethylbenzoyl) -phosphine oxide (diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide) may be used, but is not limited thereto.
  • the CLC composition may include an initiator in a ratio of 0.1 part by weight to 10 parts by weight with respect to 100 parts by weight of the compound of Formula 1.
  • an initiator in a ratio of 0.1 part by weight to 10 parts by weight with respect to 100 parts by weight of the compound of Formula 1.
  • the CLC composition may include chiral agent in a ratio of 1 part by weight to 10 parts by weight with respect to 100 parts by weight of the compound of Formula 1.
  • the CLC composition may further comprise a solvent as needed.
  • a solvent for example, Halogenated hydrocarbons, such as chloroform, dichloromethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, chlorobenzene; Aromatic hydrocarbons such as benzene, toluene, xylene, methoxy benzene and 1,2-dimethoxybenzene; Alcohols such as methanol, ethanol, propanol, isopropanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone and cyclopentanone; Cellosolves such as methyl cellosolve, ethyl cellosolve and butyl cellosolve; Ethers such as diethylene glycol dimethyl ether (DEGDME), dipropylene glycol dimethyl ether (DPGDME), and the like.
  • DEGDME diethylene
  • the CLC composition may further include a surfactant.
  • the surfactant is distributed on the surface of the liquid crystal to not only make the surface uniform, but also stabilize the liquid crystal orientation to keep the surface of the film smooth after the formation of the CLC layer, thereby improving appearance quality.
  • a fluorocarbon surfactant and / or a silicone-based surfactant may be used.
  • Fluorocarbon-based surfactants may be 3M's Fluorad FC4430 TM, Fluorad FC4432 TM, Fluorad FC4434 TM, and Dupont's Zonyl, and the like.
  • BYK TM manufactured by BYK-Chemie may be used.
  • the content of the surfactant is not particularly limited and may be appropriately selected in consideration of coating efficiency and drying efficiency.
  • Coating the CLC composition in the manufacturing method, and forming the CLC layer for example, by irradiating the coating layer of the CLC composition with ultraviolet rays, forming a concentration gradient of the chiral agent in the coating layer; And curing the coating layer in which the concentration gradient of the chiral agent is formed.
  • the concentration gradient of the chiral agent may be formed along the thickness direction of the coating layer. Irradiation of the ultraviolet rays forming the concentration gradient of the chiral agent may be performed, for example, in a temperature range of about 40 ° C. to 80 ° C., 50 ° C. to 70 ° C., or about 60 ° C.
  • the irradiation of the ultraviolet rays for the formation of the concentration gradient may be performed by irradiating the ultraviolet rays of the ultraviolet region A with a light amount of about 10 mJ / cm 2 to 500 mJ / cm 2 .
  • the CLC layer may be formed by irradiating an amount of ultraviolet light sufficient to polymerize the components of the composition.
  • the coating layer may be fixed in a state in which the liquid crystal has a different pitch according to the concentration gradient of the formed chiral agent, thereby forming a CLC region.
  • the conditions for the irradiation of the strong ultraviolet light are not particularly limited as long as the polymerization of the components of the composition is sufficiently advanced.
  • the irradiation of the ultraviolet rays may be performed by irradiating the ultraviolet rays of the ultraviolet rays A to C with a light amount of about 1 J / cm 2 to 10 J / cm 2 .
  • a homeotropic or focal conic orientation may be formed, or a CLC layer having broadband characteristics may be effectively formed.
  • the invention also relates to an optical element.
  • An optical element includes the liquid crystal film; And a ⁇ / 4 wavelength layer disposed on at least one surface of the liquid crystal film.
  • the optical element may be used as a reflective polarizer.
  • a polymer film or a liquid crystal film may be used, and may be a single layer or a multilayer structure.
  • the polymer film include polyolefins such as PC (polycarbonate), norbonene resin (PVA), poly (vinyl alcohol), PS (polystyrene), PMMA (poly (methyl methacrylate)), PP (polypropylene), Par (poly (arylate)), PA (polyamide), PET (poly (ethylene terephthalate)) or a film containing a PS (polysulfone) and the like can be used.
  • the polymer film may be stretched or shrunk under appropriate conditions to impart birefringence to be used as the ⁇ / 4 wavelength layer.
  • the ⁇ / 4 wavelength layer may be a liquid crystal layer.
  • the liquid crystal layer which is the ⁇ / 4 wavelength layer, is formed on the surface of the substrate.
  • an alignment film may exist between the substrate and the liquid crystal layer.
  • the kind or the like of the base material or the alignment film of the liquid crystal layer, which is the ⁇ / 4 wavelength layer, or the ⁇ / 4 wavelength layer, is not particularly limited.
  • a substrate of the CLC layer described above for example, an optically isotropic substrate or the like can be used.
  • the alignment film for example, a known alignment film such as a photo alignment film or a rubbing alignment film can be used.
  • a suitable material may be used in consideration of the lower alignment layer, the desired phase difference characteristics, and the like, and for example, Merk's RM (Reactive Mesogen) or BASF's LC242 may be exemplified.
  • the liquid crystal layer which is a ⁇ / 4 wavelength layer, includes, for example, (a) forming an alignment film on a substrate, (b) applying and orienting a polymerizable liquid crystal compound on the alignment film, and then (c) aligning the liquid crystal compound. It can superpose
  • the optical element may be implemented in various structures. 5 to 12 show exemplary structures of the polarizing plate.
  • the optical element 5 is, as shown in FIG. 5, the ⁇ / 4 wavelength layer 53 formed on one surface of the first substrate 54, the first substrate 54, and the ⁇ / The CLC layer 52 and the second substrate 51 attached to the four wavelength layers 53 may be included.
  • the ⁇ / 4 wavelength layer 53 may be the liquid crystal layer, and the ⁇ / 4 wavelength layer 53 may be formed in contact with the CLC layer 52.
  • the above-described matters may be equally applied to the first or second substrates 51 and 54.
  • the aforementioned homeotropic or focal conic oriented CLC region is present in the CLC layer 52, or the aforementioned haze layer is formed on one surface of the first or second substrate 51, 54. The haze of the overall film can be adjusted.
  • the exemplary optical element 6 of FIG. 6 has a structure in which the ⁇ / 4 wavelength layer 53 and the CLC layer 52 are formed on both surfaces of one substrate 61.
  • the substrate 61 the same substrate as the substrate on which the CLC layer or the ⁇ / 4 wavelength layer is formed may be used.
  • the aforementioned homeotropic or focal conic oriented CLC region is present in the CLC layer 52, or the aforementioned haze layer is disposed on one surface of the ⁇ / 4 wavelength layer 53 or the CLC layer 52. Formed, the haze of the overall film can be controlled.
  • the exemplary optical element 7 of FIG. 7 is a structure in which the CLC layer 52 and the ⁇ / 4 wavelength layer 53 are sequentially formed on one substrate 71.
  • the substrate 71 the same substrate as the substrate on which the CLC layer or the ⁇ / 4 wavelength layer is formed may be used.
  • the homeotropic or focal conic oriented CLC region is present in the CLC layer 52, or the above-described haze layer is formed on the ⁇ / 4 wavelength layer 53 or the substrate 71 to form an overall film. The haze of can be adjusted.
  • the exemplary optical element 8 of FIG. 8 is a structure in which the lambda / 4 wavelength layer 53 and the CLC layer 52 are sequentially formed on one base material 81.
  • the same substrate as the substrate on which the substrate 81, the CLC layer, or the ⁇ / 4 wavelength layer is formed may be used.
  • a homeotropic or focal conic oriented CLC region is present in the CLC layer 52, or the above-described haze layer is formed on the CLC layer 52 or the substrate 81, and the haze of the entire film is formed. Can be adjusted.
  • the optical elements exemplarily shown in FIGS. 5 to 8 may also be integrated with the polarizing element to form the optical element.
  • the polarizing plate used for LCD etc. contains polarizing elements, such as a polyvinyl alcohol-type polarizing element, and also includes the protective film formed in the one or both surfaces of the said polarizing element.
  • the implementation of the integrated optical element by using the protective film of the polarizing plate as a substrate in the structure of the optical element exemplarily illustrated in FIGS. 5 to 8, or by attaching the optical element to the protective film of the polarizing plate.
  • the polarizing element can be comprised so that it may be arrange
  • 9 to 12 each show an integrated optical element using the structure of the optical element corresponding to FIGS. 5 to 8, and in each case, a polarizing element 91 such as a polyvinyl alcohol polarizing element or the like is included.
  • the invention also relates to an LCD.
  • An exemplary LCD can include the optical element.
  • the LCD may further include a liquid crystal panel and a light source disposed on one side of the liquid crystal panel, and the optical element may be disposed between the liquid crystal panel and the light source.
  • the optical element may be disposed such that the liquid crystal film is located closer to the light source than the ⁇ / 4 wavelength layer.
  • the LCD 13 includes, for example, a liquid crystal panel 132 in which polarizers 131 and 133 are disposed at both sides thereof, respectively;
  • the light source 135 may be disposed below the lower polarizer 133, and the optical element 134 may be disposed between the lower polarizer 133 and the light source 135.
  • the optical element 134 may include a CLC layer 1342 and a ⁇ / 4 wavelength layer 1341, and the CLC layer 1342 may be applied to the light source 135 as compared to the ⁇ / 4 wavelength layer 1341. It may be arranged to be closer together.
  • the CLC layer 1342 of the optical element 134 may transmit part of the light emitted from the light source 135 to the lower polarizer 133, and reflect the remaining light back to the light source 135.
  • the light sent to the lower polarizer 133 may be converted into linearly polarized light by the ⁇ / 4 wavelength layer 1341 and transmitted upward.
  • the light reflected by the CLC layer 1342 is reflected back inside the device, the polarization characteristic is changed to be incident again to the polarizer 134, and this process may be repeated to improve the luminance characteristics of the device.
  • the polarizer 133 and the optical device are located in the region where the polarizer 133 and the optical device 134 exist in FIG. 13. Instead of 134, the integrated optical element may be located.
  • the light emitted from the light source 135 is first incident on the CLC layer in the optical element of the unitary structure, partly reflected and partially transmitted, and the transmitted light and the? / 4 wavelength layer in the device.
  • the device may be disposed to sequentially transmit the polarizing device to be incident on the liquid crystal panel 132.
  • the LCD includes the optical element, other components, structures, and the like are not particularly limited, and all contents known in the art may be appropriately applied.
  • liquid crystal film will be described in more detail through Examples and Comparative Examples, but the range of the liquid crystal film is not limited by the following examples.
  • RMM856 a CLC mixture available from Merck
  • weight ratio 7: 3 (toluene: cyclohexanone) so that the solid content is about 40% by weight.
  • the mixture was heated at 60 ° C. for about 1 hour and then cooled sufficiently.
  • a corona treatment was performed on one surface of a PET (poly (ethylene terephthalate), MRL38, manufactured by Mitsubishi) substrate for 5 seconds under a condition of 300 Watt to prepare a base layer having a hydrophilic surface.
  • the wetting angle of the PET substrate with respect to the water is about 60 degrees, and the UV angle was adjusted so that the wetting angle of the hydrophilic surface with respect to the water was about 30 degrees to 40 degrees.
  • the CLC composition (A) was coated with a wire bar and dried at 100 ° C. for 2 minutes to form a liquid crystal layer having a thickness of about 5 ⁇ m. Thereafter, the coating layer dried at a temperature of about 60 ° C.
  • the CLC layer of the prepared liquid crystal film was attached to the ⁇ / 4 wavelength layer to prepare a reflective polarizing plate.
  • a ⁇ / 4 wavelength layer a ⁇ / 4 wavelength layer in which an alignment layer and a liquid crystal layer were sequentially formed on one surface of the TAC substrate was used.
  • a polarizing plate was prepared.
  • a liquid crystal film and a reflective polarizer were prepared in the same manner as in Example 1, except that a PET substrate without corona treatment was used.
  • the haze of the prepared liquid crystal film was measured using a haze meter (HR-100) of Seppoong Co., Ltd. and exhibited about 2% haze.
  • FIG. 14 shows the result of Example 1
  • FIG. 15 shows the result of Comparative Example 1
  • the x-axis shows the wavelength
  • the y-axis shows the transmittance.
  • the lines indicated by "0" in Figs. 14 and 15 are the results measured from the front
  • the lines indicated by "55” are the results measured at the inclination angle of 55 degrees. It can be seen from the results of FIGS. 14 and 15 that the embodiment shows stable broadband characteristics at the front and the inclination angles.
  • the x and y values of the CIE of the light passing through the CLC layer were measured according to the manufacturer's manual using Eldim's EZ Contrast equipment and described below.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

L'invention concerne un film de cristaux liquides, un procédé de production de celui-ci, et un élément optique ou un affichage à cristaux liquides le comprenant. Le film de cristaux liquides selon la présente invention peut être utilisé comme une plaque de polarisation réfléchissante qui améliore l'efficacité avec laquelle la lumière est utilisée et qui augmente la luminosité dans des dispositifs d'affichage comme des affichages à cristaux liquides.
PCT/KR2011/008588 2010-11-10 2011-11-10 Film de cristaux liquides WO2012064137A2 (fr)

Priority Applications (3)

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CN201180054379.9A CN103210327B (zh) 2010-11-10 2011-11-10 液晶膜
US13/521,703 US8962103B2 (en) 2010-11-10 2011-11-10 Liquid crystal film
JP2013538647A JP5903724B2 (ja) 2010-11-10 2011-11-10 液晶フィルム

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KR20100111753 2010-11-10
KR10-2011-0117225 2011-11-10
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010033458A (ko) * 1997-12-24 2001-04-25 오오자와 슈지로 액정성 필름
US20030183805A1 (en) * 2002-03-27 2003-10-02 Minolta Co., Ltd. Preparation method of chiral namatic liquid crystal composition and liquid crystal display
KR20070069512A (ko) * 2005-12-28 2007-07-03 삼성정밀화학 주식회사 확산패턴을 갖는 일체형 광대역 반사형 고휘도 편광판, 그제조방법 및 이를 구비하는 액정표시장치
KR20110051027A (ko) * 2009-11-09 2011-05-17 신화인터텍 주식회사 광대역 반사형 편광 필름 및 이를 포함하는 광원 장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010033458A (ko) * 1997-12-24 2001-04-25 오오자와 슈지로 액정성 필름
US20030183805A1 (en) * 2002-03-27 2003-10-02 Minolta Co., Ltd. Preparation method of chiral namatic liquid crystal composition and liquid crystal display
KR20070069512A (ko) * 2005-12-28 2007-07-03 삼성정밀화학 주식회사 확산패턴을 갖는 일체형 광대역 반사형 고휘도 편광판, 그제조방법 및 이를 구비하는 액정표시장치
KR20110051027A (ko) * 2009-11-09 2011-05-17 신화인터텍 주식회사 광대역 반사형 편광 필름 및 이를 포함하는 광원 장치

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