WO2013032283A2 - Cellule de cristaux liquides - Google Patents

Cellule de cristaux liquides Download PDF

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Publication number
WO2013032283A2
WO2013032283A2 PCT/KR2012/007007 KR2012007007W WO2013032283A2 WO 2013032283 A2 WO2013032283 A2 WO 2013032283A2 KR 2012007007 W KR2012007007 W KR 2012007007W WO 2013032283 A2 WO2013032283 A2 WO 2013032283A2
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Prior art keywords
liquid crystal
compound
crystal cell
network
weight
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PCT/KR2012/007007
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English (en)
Korean (ko)
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WO2013032283A3 (fr
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오동현
김경준
민성준
유정선
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201280053334.4A priority Critical patent/CN103907052B/zh
Priority to JP2014528288A priority patent/JP2014527202A/ja
Priority claimed from KR1020120096135A external-priority patent/KR101415127B1/ko
Publication of WO2013032283A2 publication Critical patent/WO2013032283A2/fr
Publication of WO2013032283A3 publication Critical patent/WO2013032283A3/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/56—Aligning agents

Definitions

  • the present application relates to a liquid crystal cell, a precursor of a liquid crystal layer, a method for producing a liquid crystal cell, and a use of a liquid crystal cell.
  • LCD Liquid Crystal Display
  • a nematic or smectic liquid crystal compound in a certain direction, and switches an orientation through application of a voltage to implement an image.
  • the manufacturing process of the LCD is a costly process requiring a complicated process, so a large production line and equipment are required.
  • PDLC Polymer Dispersed Liquid Crystal implemented by dispersing the liquid crystal in the polymer matrix
  • PNLC Polymer Network Liquid Crystal
  • PDLC Polymer Stabilized Liquid Crystal
  • the present application provides a liquid crystal cell, a precursor of the liquid crystal layer, a manufacturing method of the liquid crystal cell and the use of the liquid crystal cell.
  • An exemplary liquid crystal cell includes a liquid crystal layer.
  • the liquid crystal layer may include an alignment network and a liquid crystal region.
  • the liquid crystal region includes a liquid crystal compound and may be included inside the alignment network.
  • liquid crystal region refers to a region containing a liquid crystal compound, and may refer to a region dispersed in the network in a state separated from the orientation network.
  • the oriented network can be a network of precursors comprising an oriented compound.
  • the term “network of precursors comprising an oriented compound” may mean, for example, a polymer network comprising a precursor comprising an oriented compound or a polymer network comprising such precursors crosslinked or polymerized.
  • the term "orientation compound” is, for example, aligned in a predetermined direction through irradiation of light or the like, and the adjacent liquid crystal compound is determined through an interaction such as anisotropic interaction in the aligned state. It can mean a compound that can be oriented in the direction.
  • the compound may be a monomolecular compound, a monomeric compound, an oligomeric compound, or a high molecular compound.
  • a photo-alignment compound can be used, for example.
  • the photo-alignment compound may refer to a compound which can be aligned in a predetermined direction by irradiation of light, for example, irradiation of linearly polarized light, to induce alignment of adjacent liquid crystal compounds.
  • the photoalignable compound may be a compound including a photosensitive moiety.
  • Various photo-alignment compounds that can be used for the alignment of the liquid crystal compound are known.
  • Photo-alignment compounds include, for example, compounds aligned by trans-cis photoisomerization; Compounds aligned by photo-destruction, such as chain scission or photo-oxidation; Compounds ordered by photocrosslinking or photopolymerization such as [2 + 2] addition cyclization ([2 + 2] cycloaddition), [4 + 4] addition cyclization or photodimerization; Compounds aligned by photo-Fries rearrangement or compounds aligned by ring opening / closure reaction may be used.
  • azo compounds or stilbenes such as sulfated diazo dyes or azo polymers
  • cyclobutane tetracarboxylic dianhydride cyclobutane-1,2,3,4-tetracarboxylic dianhydride
  • aromatic polysilane or polyester polystyrene or polyimide and the like
  • polystyrene or polyimide and the like can be exemplified.
  • a compound aligned by photocrosslinking or photopolymerization a cinnamate compound, a coumarin compound, a cinnanam compound, a tetrahydrophthalimide compound, a maleimide compound , Benzophenone compounds, diphenylacetylene compounds, compounds having chalconyl residues (hereinafter referred to as chalconyl compounds) or compounds having anthracenyl residues (hereinafter referred to as anthracenyl compounds) as photosensitive residues;
  • chalconyl compounds compounds having chalconyl residues
  • anthracenyl compounds compounds having anthracenyl residues
  • examples of the compounds aligned by the optical freeze rearrangement include aromatic compounds such as benzoate compounds, benzoamide compounds, and methacrylamidoaryl methacrylate compounds.
  • the compound aligned by the ring-opening / ring-closure reaction such as a spiropyran compound A [4 + 2] ⁇ electron system ([4 + 2] ⁇ electronic system), but may be exemplified by compounds such as sorting by a ring opening / ring-closure reaction of, without being limited thereto.
  • the photo-alignment compound may be a monomolecular compound, a monomeric compound, an oligomeric compound, or a high molecular compound, or may be in the form of a blend of the photo-alignment compound and the polymer.
  • the oligomeric or polymeric compound as described above may have a residue derived from the above-described photoalignable compound or a photosensitive residue described above in the main chain or in the side chain.
  • Polymers having residues or photosensitive residues derived from photo-alignment compounds or that can be mixed with the photo-alignment compounds include polynorbornene, polyolefins, polyarylates, polyacrylates, poly (meth) acrylates, poly Examples include mead, poly (amic acid), polymaleimide, polyacrylamide, polymethacrylamide, polyvinyl ether, polyvinyl ester, polystyrene, polysiloxane, polyacrylonitrile or polymethacrylonitrile It may be, but is not limited thereto.
  • Polymers that may be included in the oriented compound are typically polynorbornene cinnamates, polynorbornene alkoxy cinnamates, polynorbornene allylyloxy cinnamates, polynorbornene fluorinated cinnamates, polynorbornene chlorinated cinnamates or Polynorbornene discinnamate and the like can be exemplified, but is not limited thereto.
  • the oriented compound is a polymeric compound
  • the compound may have, for example, a number average molecular weight of about 10,000 g / mol to about 500,000 g / mol, but is not limited thereto.
  • the orientation compound is orientationally ordered, and the liquid crystal compound of the liquid crystal region may exist in a state that is oriented by the network in the alignment state without voltage application.
  • the alignment compound may simply be included in the alignment network in the alignment state or crosslinked and / or polymerized in the alignment state to form the orientation network.
  • the oriented compound may include one or more crosslinkable or polymerizable functional groups to crosslink or polymerize to form an oriented network.
  • a crosslinkable or polymeric functional group the functional group which reacts by application of heat or irradiation of active energy rays, such as an ultraviolet-ray, can be used, for example.
  • Such functional groups include alkenyl groups such as hydroxy groups, carboxyl groups, vinyl groups or allyl groups, epoxy groups, oxetanyl groups, vinyl ether groups, cyano groups, acryloyl groups, methacryloyl groups, acryloyloxy groups or methacrylo Iloxy group and the like can be exemplified but is not limited thereto.
  • Such functional groups include, for example, functional groups capable of participating in a crosslinking or polymerization reaction by radical reaction or cationic reaction by heat or irradiation of active energy rays or under a basic environment. Such functional groups may be introduced into, for example, the main chain or side chain of the alignment compound.
  • the precursor forming the oriented network may further comprise a crosslinking agent.
  • the crosslinking agent may be added to control the afterimage or strength of the liquid crystal cell.
  • a crosslinking agent the compound which can implement
  • Various crosslinking agents which can implement a crosslinking structure are known according to a high molecular compound.
  • a crosslinking agent it is a polyhydric compound which has two or more functional groups, and isocyanate compound, an epoxy compound, an isothiocyanate compound, a vinyl ether compound, an alcohol, an amine compound, a thiol compound, a carboxylic acid compound, an aziridine compound, or a metal Chelating compounds and the like.
  • crosslinking agent capable of participating in a crosslinking reaction by irradiation of active energy rays such as ultraviolet rays
  • active energy rays such as ultraviolet rays
  • alkenyl groups such as vinyl or allyl groups, epoxy groups, oxetanyl groups, vinyl ether groups, acryloyl groups, methacryloyl groups
  • Compounds containing two or more acryloyloxy groups or methacryloyloxy groups may be used.
  • polyfunctional acrylate etc. can be illustrated typically.
  • trimethylolpropane tri (meth) acrylate pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) ) Acrylate, dipentaerythritol hexa (meth) acrylate, triglycerol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, pentaerythritol di (Meth) acrylate, 1,6-hexanediol di (meth) acrylate, glycerol di (meth) acrylate, tris [2- (acryloyloxy) ethyl] isocyanurate, urethane acrylate, glycerol 1 , 3-diglycerol di (meth) acrylate
  • the crosslinking agent may be included in an appropriate ratio in consideration of the degree of control and intensity of the afterimage, the phase separation characteristics of the liquid crystal region and the alignment network, the anchoring characteristics, the photosensitivity, the dielectric constant and the refractive index, and the like.
  • the precursor of the oriented network is 0.1 part by weight to 100 parts by weight, 5 parts by weight to 100 parts by weight, 10 parts by weight to 90 parts by weight, 10 parts by weight to 80 parts by weight, 10 parts by weight of 100 parts by weight of the orientation compound. It may comprise from about 70 parts by weight, about 10 parts by weight to about 60 parts by weight, or about 10 parts by weight to about 50 parts by weight of the crosslinking agent.
  • the proportion of the crosslinking agent may be changed depending on the kind of the crosslinking agent and the alignment compound used.
  • the unit weight part may mean a ratio of weight between components, unless otherwise specified.
  • Precursors of the oriented network may further comprise additives such as solvents, radical or cationic initiators, basic materials, other reactive compounds or surfactants capable of forming the network, if necessary.
  • the alignment network may satisfy the following Equation 1 together with the liquid crystal compound in the liquid crystal region.
  • n p is the refractive index of the oriented network
  • n o is the ordinary refractive index of the liquid crystal compound
  • n e is the extraordinary refractive index of the liquid crystal compound
  • a is 0 ⁇ a ⁇ 0.5 Is a number that satisfies
  • the refractive index may be, for example, a refractive index measured for light having a wavelength of 550 nm.
  • refractive index of an oriented network used in this specification means the normal refractive index of the said network.
  • a may be, for example, less than 0.4, less than 0.3, less than 0.2, less than 0.1, or 0.
  • the oriented network may also have a dielectric anisotropy of at least 3, at least 3.5 or at least 4. It is possible to maintain excellent driving voltage characteristics of the liquid crystal cell in the dielectric constant range.
  • the upper limit of the dielectric constant is not particularly limited and may be, for example, about 20 or less, about 15 or less, or about 10 or less.
  • the liquid crystal region dispersed in the orientation network contains a liquid crystal compound.
  • a liquid crystal compound any kind of compound may be used as long as it can be phase-separated in the orientation network and exist in an orientation oriented by the orientation network.
  • a smectic liquid crystal compound, a nematic liquid crystal compound, or a cholesteric liquid crystal compound may be used as the liquid crystal compound.
  • the liquid crystal compound may be in a phase-separated state, which is not coupled to the orientation network, and may change in orientation when a voltage is applied from the outside.
  • the liquid crystal compound may be a compound having no polymerizable group or crosslinkable group.
  • a nematic liquid crystal compound may be used as the liquid crystal compound.
  • fills following formula 2 can be used, for example.
  • b may be 0.1 to 0.9, 0.1 to 0.7, 0.1 to 0.5, or 0.1 to 0.3 in another example.
  • Liquid crystal compounds also have a difference between an ideal dielectric constant ( ⁇ e , an extraordinary dielectric anisotropy) and a normal dielectric constant ( ⁇ o , an ordinary dielectric anisotropy, a uniaxial dielectric constant) of at least 3, at least 3.5, at least 4, at least 6, 8 or more or 10 or more. Having such a dielectric constant can provide a device having excellent driving voltage characteristics.
  • the difference in the dielectric constant is that the higher the numerical value, the more the device can exhibit appropriate characteristics, and its upper limit is not particularly limited.
  • the liquid crystal compound has an ideal dielectric constant ( ⁇ e , extraordinary dielectric anisotropy) of about 6 to 50, and a normal dielectric constant ( ⁇ o , ordinary dielectric anisotropy, dielectric constant in the uniaxial direction) of about 2.5 to 7 Phosphorus compounds can be used.
  • ⁇ e extraordinary dielectric anisotropy
  • ⁇ o normal dielectric constant
  • the liquid crystal compound of the liquid crystal region in the liquid crystal cell is 100 parts by weight to 2,500 parts by weight, 100 parts by weight to 2,000 parts by weight, 100 parts by weight to 1,900 parts by weight, 100 parts by weight to 1,800 parts by weight, 100 parts by weight based on 100 parts by weight of the alignment network.
  • the ratio of the liquid crystal compound can be changed as necessary.
  • the liquid crystal cell can exhibit excellent transparency even in a state where no voltage is applied.
  • the liquid crystal cell may exhibit a light transmittance of 80% or more, 85% or more, 90% or more, or 95% or more in a voltage-free state.
  • the light transmittance may be a light transmittance for a visible light region, for example, a wavelength in the range of about 400 nm to 700 nm.
  • the liquid crystal cell may further include one or two or more base layers.
  • the liquid crystal layer may be formed on the surface of the substrate layer or between two or more substrate layers.
  • the liquid crystal cell further includes a base layer facing each other, and the liquid crystal layer may be present between the opposite base layer.
  • FIG. 1 illustrates an example including a liquid crystal layer 102 that is disposed between base layers 101A and 101B spaced apart from each other at predetermined intervals, and includes an orientation network 1021 and a liquid crystal region 1022. Typical liquid crystal cell is shown. In FIG. 1, the liquid crystal compound is indicated by an arrow in the liquid crystal region 1022.
  • a base material layer a well-known material can be used without a restriction
  • inorganic films, plastic films, etc. such as a glass film, a crystalline or amorphous silicon film, a quartz, or an Indium Tin Oxide (ITO) film, can be used.
  • the optically isotropic base material layer the optically anisotropic base material layer like a retardation layer, a polarizing plate, a color filter substrate, etc. can be used.
  • plastic substrate layer examples include triacetyl cellulose (TAC); COP (cyclo olefin copolymer) such as norbornene derivatives; Poly (methyl methacrylate); PC (polycarbonate); PE (polyethylene); PP (polypropylene); PVA (polyvinyl alcohol); DAC (diacetyl cellulose); Pac (Polyacrylate); PES (poly ether sulfone); PEEK (polyetheretherketon PPS (polyphenylsulfone), PEI (polyetherimide); PEN (polyethylenemaphthatlate); PET (polyethyleneterephtalate); PI (polyimide); PSF (polysulfone); PAR (polyarylate) or amorphous fluorine resin
  • the substrate layer may include a coating layer of a silicon compound such as gold, silver, silicon dioxide or silicon monoxide, or a coating layer such as an antireflection layer, if necessary.
  • An electrode layer may be included on the surface of the substrate layer, for example, the surface of the substrate layer on the liquid crystal layer side (for example, the surface of the substrate layer 101A or 101B in contact with the liquid crystal layer 102 in FIG. 1).
  • it may be formed by depositing a conductive polymer, a conductive metal, a conductive nanowire, or a metal oxide such as indium tin oxide (ITO), etc.
  • the electrode layer may be formed to have transparency.
  • Various materials and formation methods capable of forming the electrode layer are known, and all of these methods can be applied, and if necessary, the electrode layer formed on the surface of the base layer may be appropriately patterned.
  • the liquid crystal cell may further include a polarizing plate disposed on one side or both sides of the liquid crystal layer.
  • a polarizing plate a conventional material used in an existing LCD may be used without particular limitation.
  • the polarizing plates are disposed on both sides of the liquid crystal cell, for example, the light absorption axes of the respective polarizing plates may be disposed to be perpendicular to each other.
  • exemplary precursors may include precursors and liquid crystal compounds of an oriented network.
  • the precursor of the oriented network may comprise an oriented compound, for example the photoalignable compound.
  • the precursor material may form an oriented network, and the liquid crystal compound may be phase-separated from the network to form the liquid crystal region in the process of forming the network.
  • oriented compound a compound described above, for example, a photo-alignment compound or a precursor compound capable of forming the compound can be used, and the same compound as described above can also be used as the liquid crystal compound.
  • the precursor is a compound capable of forming an oriented network together with the oriented compound, if necessary, and may suitably include the crosslinking agent described above.
  • the types described above may be equally applied to the types and proportions of the alignment compound, the crosslinking agent, and the liquid crystal compound.
  • the precursor and the liquid crystal compound of the alignment network may satisfy the following Equation 1.
  • n p is the refractive index of the oriented network formed by the precursor
  • n o is the normal refractive index of the liquid crystal compound
  • n e is the extraordinary refractive index of the liquid crystal compound
  • a may be, for example, less than 0.4, less than 0.3, less than 0.2, less than 0.1, or 0.
  • the precursors of the oriented network may also be selected to form a network having a dielectric anisotropy of at least 3, at least 3.5 or at least 4.
  • liquid crystal compound may be a nematic liquid crystal compound, for example, may be a nematic liquid crystal compound satisfying the following formula (2).
  • n o is the normal refractive index of the liquid crystal compound, for example, the refractive index in the uniaxial direction of the nematic liquid crystal compound
  • n e is the extraordinary refractive index of the liquid crystal compound, for example, It is the refractive index of the long-axis direction of a nematic liquid crystal compound
  • b is a number which satisfy
  • the liquid crystal compound also has a difference between an ideal dielectric constant ( ⁇ e , an extraordinary dielectric anisotropy) and a normal dielectric constant ( ⁇ o , an ordinary dielectric anisotropy; , 8 or more or 10 or more. Having such a dielectric constant can provide a device having excellent driving voltage characteristics.
  • the liquid crystal compound may have an abnormal dielectric constant ( ⁇ e , permittivity in the major axis direction) of about 6 to 50, and a normal dielectric constant ( ⁇ o , ordinary dielectric anisotropy, permittivity in the short axis direction) of about 2.5 to about 7.
  • the liquid crystal compound in the precursor 100 parts by weight to 2,500 parts by weight, 100 parts by weight to 2,000 parts by weight, 100 parts by weight to 1,900 parts by weight, 100 parts by weight to 1,800 parts by weight, 100 parts by weight to 1,700 with respect to 100 parts by weight of the precursor Parts by weight, 100 parts by weight to 1,600 parts by weight, 100 parts by weight to 1,500 parts by weight, 100 parts by weight to 1,400 parts by weight, 100 parts by weight to 1,300 parts by weight, 100 parts by weight to 1,200 parts by weight, 100 parts by weight to 1,100 parts by weight , 100 parts by weight to 1,000 parts by weight, 100 parts by weight to 900 parts by weight, 100 parts by weight to 800 parts by weight, 100 parts by weight to 700 parts by weight, 100 parts by weight to 600 parts by weight, 100 parts by weight to 500 parts by weight, 100 parts by weight It may be included in the ratio of about 400 parts by weight, 100 parts by weight to 300 parts by weight, or about 150 parts by weight to 250 parts by weight, but this may be appropriately changed as necessary.
  • the precursor may further comprise a solvent if necessary.
  • the solvent that can be used is not particularly limited and, for example, an appropriate kind can be selected from known solvents such as toluene, xylene, cyclopentanone or cyclohexanone.
  • Precursors may further contain, for example, appropriate radicals or catalysts such as cationic initiators and amines, or other reactive compounds or surfactants capable of forming a network, in order to promote network formation reactions such as an oriented compound and / or a crosslinking agent. It may further include an additive.
  • appropriate radicals or catalysts such as cationic initiators and amines, or other reactive compounds or surfactants capable of forming a network, in order to promote network formation reactions such as an oriented compound and / or a crosslinking agent. It may further include an additive.
  • the present application also relates to a method for manufacturing a liquid crystal cell.
  • the manufacturing method of the liquid crystal cell may include, for example, irradiating light to the layer of the precursor. By irradiating the layer of the precursor with light, it is possible to induce the formation of a network by the alignment, crosslinking and / or polymerization of the above-described alignment compound and phase separation of the liquid crystal compound.
  • Irradiation of light may be performed so that the alignment compound included in the layer of the precursor can be aligned.
  • the alignment of the orienting compound can be performed using linearly polarized light.
  • the wavelength or intensity of the irradiated light can be selected to provide for proper alignment of the oriented compound.
  • oriented compounds for example photoalignable compounds, are aligned by visible or near ultraviolet light, although far ultraviolet or near infrared light may be used if necessary. have.
  • FIG. 2 is a diagram schematically illustrating a process of irradiating light to a layer 201 of a precursor including a liquid crystal compound (arrow) formed on the substrate layer 1011 and having an isotropic state.
  • irradiation of light may be performed at an isotropic transition temperature (T NI ) or higher temperature range of the liquid crystal compound.
  • FIG. 3 is a diagram schematically showing the liquid crystal layer 102 including the alignment network 1021 and the liquid crystal region 1022 formed on the substrate layer 1011 after light irradiation.
  • an appropriate heat application or exposure process may be performed before or after the irradiation process of light, or at the same time, in order to further promote formation of an oriented network.
  • an additional base layer for example, a base layer having a transparent electrode layer formed on the surface thereof is attached to the liquid crystal layer formed as necessary to form an element having a structure as shown in FIG. 1. It may be.
  • the manufacturing process of the liquid crystal cell as described above may be continuously performed by, for example, a roll to roll method.
  • the present application also relates to the use of the liquid crystal cell.
  • Exemplary liquid crystal cells can be produced simply and continuously through, for example, a roll-to-roll process.
  • the liquid crystal cell can also be implemented as a flexible element, and can secure an excellent contrast ratio.
  • the liquid crystal cell may be applied to various applications, and may be applied to various fields such as a smart window, a window protective film, a flexible display device, an active retarder for viewing 3D images, or a viewing angle control film.
  • Exemplary liquid crystal cells of the present application can be produced simply and continuously through, for example, a roll-to-roll process.
  • the liquid crystal cell may also be implemented as a flexible device, and can secure an excellent contrast ratio.
  • the liquid crystal cell may be applied to various applications, including, for example, a smart window, a window protective film, a flexible display device, an active retarder for viewing 3D images, a viewing angle adjusting film, and the like.
  • FIG. 1 shows an exemplary liquid crystal cell.
  • FIGS. 2 and 3 are diagrams for explaining a manufacturing process of an exemplary liquid crystal cell.
  • FIG. 4 is a photograph showing luminance variation between two polarizers of a liquid crystal cell manufactured in an embodiment.
  • FIG. 5 is a graph showing the transmittance of the liquid crystal cell manufactured in the embodiment.
  • FIG. 6 is a diagram illustrating a phase difference according to rotation of polarized visible light of a liquid crystal cell manufactured in an embodiment.
  • liquid crystal cell will be described in detail through examples according to the present application, but the range of the liquid crystal cell is not limited by the following examples.
  • a precursor prepared on the electrode layer of the transparent polycarbonate base layer having the ITO transparent electrode layer formed on the surface thereof was coated with a bar coater, and toluene as a solvent was volatilized to form a layer of a precursor having a thickness of about 7 ⁇ m.
  • the layer of precursor was then placed on a hot plate with a WGP (Wire Grid Polarizer) placed thereon and the temperature of the hot plate was set to 90 ° C. After maintaining the layer of the precursor until it is transparent, the layer of the precursor in a transparent state was irradiated with linearly polarized ultraviolet rays (1,200 mJ / cm 2 ) through the WGP to form a liquid crystal layer comprising an alignment network and a liquid crystal region.
  • the refractive index measured using the prism coupler for the formed orientation network was about 1.573. Thereafter, the surface of the ITO transparent electrode layer of the polycarbonate film having the ITO transparent electrode layer formed on the surface was attached to the formed liquid crystal layer to prepare a liquid crystal cell.
  • the liquid crystal cell prepared in Example was positioned between two polarizing plates (upper and lower polarizing plates) arranged so that the light absorption axes were perpendicular to each other. Luminance was evaluated while irradiating light to the lower polarizing plate side in the state which arrange
  • 4 is a photograph showing the evaluation result, the left figure of FIG. 4 shows a case of 45 degrees with a light transmission axis, and the right figure shows a case of 90 degrees.
  • a liquid crystal cell was manufactured in the same manner as in Example, but the liquid crystal cell was manufactured while changing the irradiation intensity of light, and the transmittance thereof was measured and shown in FIG. 5. It can be seen from FIG. 5 that the transparency of the liquid crystal cell changes depending on the degree of alignment of the alignment network.
  • the liquid crystal cell was manufactured in the same manner as in the embodiment, but the liquid crystal cell was manufactured by changing the irradiation intensity of light, and the phase difference characteristic according to the rotation of polarized visible light according to the exposure amount was evaluated using an axostep equipment. 6 is shown.
  • the liquid crystal cell prepared in Example was positioned between two polarizing plates (upper and lower polarizing plates) arranged so that the light absorption axes were perpendicular to each other.
  • the alignment direction of the liquid crystal cell was disposed to form 45 degrees with the light transmission axis of any one of the two polarizing plates.
  • an AC power source was connected to the ITO transparent electrode layer of the upper and lower base layer (polycarbonate film), and the transmittance according to the driving voltage was measured using a photodiode laser, and this is illustrated in FIG. 7.
  • the liquid crystal cell of the embodiment exhibited a contrast ratio of about 400: 1 at a voltage of about 43V.

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Abstract

L'invention concerne une cellule de cristaux liquides, un précurseur de couche de cristaux liquides, un procédé de fabrication de cellule de cristaux liquides, et des utilisations de cellule de cristaux liquides. Des exemples de cellules de cristaux liquides selon la présente invention peuvent être obtenus en continu et facilement selon un processus, par exemple, de cylindre contre cylindre ou similaire. La cellule de cristaux liquides peut également être réalisée dans un dispositif flexible, et peut fournir un rapport de contraste supérieur. La cellule de cristaux liquides susmentionnée peut être appliquée à diverses utilisations comme une fenêtre intelligente, un film de protection de fenêtre, un dispositif d'affichage flexible et un retardateur actif ou un film d'ajustement d'angle de visualisation pour un affichage d'image 3D.
PCT/KR2012/007007 2011-08-31 2012-08-31 Cellule de cristaux liquides WO2013032283A2 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015114864A1 (fr) * 2014-01-30 2015-08-06 公立大学法人兵庫県立大学 Composition de cristaux liquides photoréactifs, élément d'affichage, élément optique, procédé de fabrication d'un élément d'affichage, et procédé de fabrication d'un élément optique

Citations (7)

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JPWO2015114864A1 (ja) * 2014-01-30 2017-03-23 公立大学法人兵庫県立大学 光反応性液晶組成物、表示素子、光学素子、表示素子の製造方法、光学素子の製造方法
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US11560517B2 (en) 2014-01-30 2023-01-24 University Of Hyogo Photoreactive liquid crystal composition, display element, optical element, method for manufacturing display element, and method for manufacturing optical element

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