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WO2011068365A2 - Procédé de fabrication d'un corps de commande de lumière de type pdlc à l'aide d'une lumière de grande longueur d'onde, corps de commande de lumière de type pdlc - Google Patents

Procédé de fabrication d'un corps de commande de lumière de type pdlc à l'aide d'une lumière de grande longueur d'onde, corps de commande de lumière de type pdlc Download PDF

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Publication number
WO2011068365A2
WO2011068365A2 PCT/KR2010/008573 KR2010008573W WO2011068365A2 WO 2011068365 A2 WO2011068365 A2 WO 2011068365A2 KR 2010008573 W KR2010008573 W KR 2010008573W WO 2011068365 A2 WO2011068365 A2 WO 2011068365A2
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Prior art keywords
liquid crystal
dye
light control
control body
crystal composition
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PCT/KR2010/008573
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English (en)
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WO2011068365A3 (fr
Inventor
Jin Who Hong
Yang Bae Kim
Jung Dae Cho
Su Cheol Park
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Q-Sys Co., Ltd.
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Publication of WO2011068365A2 publication Critical patent/WO2011068365A2/fr
Publication of WO2011068365A3 publication Critical patent/WO2011068365A3/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • 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
    • C09K19/542—Macromolecular compounds
    • C09K19/544—Macromolecular compounds as dispersing or encapsulating medium around the liquid crystal
    • 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

Definitions

  • the present invention relates to a method of manufacturing a PDLC type light control body using long-wavelength light and a PDLC type light control body manufactured using the method.
  • a PDLC (polymer dispersed liquid crystal) type light control body which includes a polymer matrix and fine liquid crystal droplets formed in the polymer matrix, is influenced by an externally-applied voltage.
  • a voltage is applied to the PDLC type light control body, liquid crystal droplets become regularly aligned in the direction of the electric field caused by the applied voltage, so that the orientation of the liquid crystals is in accord with the direction of light penetrating the light control body, with the result that the light control body transmits light.
  • liquid crystal droplets are irregularly aligned, so that they do not become aligned in the direction of light penetrating the light control body, with the result that the light control body scatters light. That is, the PDLC type light control body can transmit or scatter light depending on whether or not a voltage has been applied.
  • Such a PDLC type light control body unlike nematic liquid crystal displays, has good brightness although a polarizing plate is not used, and its manufacturing process is simple because a rubbing process for orienting liquid crystal can be omitted, so that it can be widely applied to shields for windows, large-area displays and the like.
  • a PDLC type light control body is manufactured such that, when a liquid crystal composition including liquid crystal, a dye, oligomers, monomers and a photoinitiator is applied between two transparent substrates, each of which is provided thereon with a transparent electrode layer, to form a liquid crystal composition layer therebetween and then the liquid crystal composition layer is irradiated with ultraviolet, oligomers, monomers and the like are photocured by the photoinitiator included in the composition to form polymer matrices, and simultaneously liquid crystal droplets are formed in between the polymer matrices.
  • the photoinitiator included in the liquid crystal composition since the photoinitiator included in the liquid crystal composition has a maximum absorbance peak at a wavelength of about 300 nm and a slight absorbance peak at a wavelength of about 380 nm, the photocuring of the liquid crystal composition is chiefly performed by irradiating the liquid crystal composition with light in the wavelength range of less than 380 nm (for example, light having a wavelength of 365 nm).
  • the dye included in the liquid crystal composition is characterized in that it has a large absorbance peak in a short-wavelength region of less than 380 nm, the dye absorbs the light which must be absorbed by a photoinitiator, and thus the photocuring of the liquid crystal composition is incomplete.
  • liquid crystal composition when the liquid crystal composition is photocured by irradiating the liquid crystal composition with light in the short-wavelength region of less than 380 nm, there is a problem in that the dye is destroyed by the light in the short-wavelength region, thus increasing the color difference.
  • the present invention has been devised to solve the above-mentioned problems, and the present invention intends to provide a method of manufacturing a PDLC type light control body using long-wavelength light, which can increase a haze by improving a light scattering effect when a voltage is not applied, which can increase the relative contrast ratio thereof when voltage is applied compared to when voltage is not applied, which can improve the adhesion between a polymer matrix and a transparent substrate and which can decrease color difference by preventing a dye from being destroyed by the irradiated light, and a PDLC type light control body manufactured using the method.
  • An aspect of the present invention provides a method of manufacturing a PDLC type light control body using long-wavelength light, including the steps of: preparing a liquid crystal composition for manufacturing the PDLC type light control body; applying the liquid crystal composition between two transparent substrates, each being provided thereon with a transparent electrode layer, to form a liquid crystal composition layer therebetween; and irradiating the liquid crystal composition layer formed between the two transparent substrates with light having a wavelength range of 380 ⁇ 460 nm to photocure the liquid crystal composition layer.
  • the irradiated light may be light emitted from a light emitting diode (LED).
  • the light emitted from the light emitting diode (LED) may have a wavelength of 395 nm or 405 nm.
  • the liquid crystal composition may include liquid crystal, a dye, an oligomer and a photoinitiator, and the photoinitiator may exhibit an absorbance peak in the wavelength region of 380 ⁇ 460 nm.
  • the photoinitiator may include one or more selected from the group consisting of diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide (MAPO) (DAROCUR TPO, manufactured by Ciba Specialty Chemicals Co., Ltd.), phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide (BAPO) (IRGACURE 819, manufactured by Ciba Specialty Chemicals Co., Ltd.), and bis(etha-5-2,4-cyclopentadiene-1-yl)bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phentyl] titanium (Metallocene) (IRGACURE 784, manufactured by Ciba Specialty Chemicals Co., Ltd.).
  • MAPO diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide
  • BAPO phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide
  • the dye may include one or more selected from the group consisting of an azo dye, an anthraquinone dye, a phenylene dye, a mellocyanine dye, an azomethine dye, a phthaloperylene dye, an indigo dye, an azulene dye, a dioxazine dye, and a polythiophene dye.
  • a PDLC type light control body including: two transparent substrates, each being provided thereon with a transparent electrode; and a light control layer formed between the two transparent substrates and including a polymer matrix and liquid crystal droplets dispersed in the polymer matrix, wherein the light control layer has a pendulum hardness of 30s or more, which is measured after removing one of the two transparent substrates.
  • the PDLC type light control body may be manufactured by the method.
  • the method of manufacturing a PDLC type light control body using long-wavelength light and the PDLC type light control body manufactured using the method according to the present invention are advantageous in that the haze of the PDLC type light control body can be increased by improving a light scattering effect when a voltage is not applied, the relative contrast ratio thereof when voltage is applied compared to when voltage is not applied can be increased, the adhesion between a polymer matrix and a transparent substrate can be improved, and the color difference thereof can be decreased by preventing a dye from being destroyed by the irradiated light.
  • FIG. 1 is a graph showing the absorbance of a dye versus wavelength according to Examples and Comparative Examples of the present invention.
  • FIG. 2 is a graph showing the absorbance of a photoinitiator versus wavelength according to Examples and Comparative Examples of the present invention.
  • the method of manufacturing a PDLC type light control body using long-wavelength light includes the steps of: preparing a liquid crystal composition for manufacturing the PDLC type light control body; applying the liquid crystal composition between two transparent substrates, each being provided thereon with a transparent electrode layer, to form a liquid crystal composition layer therebetween; and irradiating the liquid crystal composition layer formed between the two transparent substrates with light having a wavelength range of 380 ⁇ 460 nm to photocure the liquid crystal composition layer.
  • Red an azo dye, manufactured by Sigma-Aldrich Co., Ltd., Sudan Red
  • Blue an anthraquinone dye, manufactured by Sigma-Aldrich Co., Ltd., Oil Blue
  • Black an azo dye, manufactured by Sigma-Aldrich Co., Ltd., Sudan Black
  • the wavelength band at which a photoinitiator causes a radical formation reaction overlaps with the wavelength band at which a dye exhibits a large absorbance peak, the loss of light absorbed by the photoinitiator is increased by the large absorbance peak existing in the short wavelength band of an ultraviolet region of the dye, so that the radical formation reaction cannot be easily performed by the photoinitiator, with the result that the photocuring reaction of the oligomer, monomer and the like included in the liquid crystal composition is not sufficiently performed.
  • the degree to which a polymer matrix has been cured can be improved by irradiating the liquid crystal composition with light having a long wavelength band of 380 ⁇ 460 nm although a large absorbance peak does not exist in the short wavelength band of an ultraviolet region of the dye used in the liquid crystal composition for manufacturing a PDLC type light control body.
  • the liquid crystal composition is photocured by irradiating it with light having a wavelength that is smaller than 380 nm, there is a problem in that the dye included in the liquid crystal composition is destroyed, thus increasing the color difference of the finally-produced light control body.
  • the photocuring reaction of the liquid crystal composition can be caused by the radical formation reaction, so that the liquid crystal composition can be easily prepared and stored when it is irradiated with light having a wavelength of 460 nm or less.
  • the irradiated light may be light emitted from a light emitting diode (LED).
  • the light emitted from the light emitting diode (LED) may have a wavelength of 395 nm or 405 nm.
  • the liquid crystal composition for manufacturing a PDLC type light control body according to the present invention may include liquid crystal, a dye, an oligomer and a photoinitiator, and the photoinitiator may exhibit an absorbance peak in the wavelength region of 380 ⁇ 460 nm such that the radical formation reaction can be performed even in a long-wavelength band longer than the wavelength band of the maximum absorbance peak in the ultraviolet region of the dye.
  • a photoinitiator for example, phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide (BAPO) (IRGACURE 819, manufactured by Ciba Specialty Chemicals Co., Ltd.), has an absorbance peak even in a wavelength band of 380 ⁇ 460 nm, thus causing a radical formation reaction in this range. Therefore, when a composition including such a photoinitiator is prepared and then a PDLC type light control body is manufactured using this composition, the photocuring reaction of a polymer matrix of the PDLC type light control body can be accelerated by irradiating the composition with light having a wavelength of 380 ⁇ 460 nm.
  • BAPO phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide
  • the photoinitiator may include one or more selected from the group consisting of diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide (MAPO-base photoinitiator) (DAROCUR TPO, manufactured by Ciba Specialty Chemicals Co., Ltd.), phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide (BAPO-based photoinitiator) (IRGACURE 819, manufactured by Ciba Specialty Chemicals Co., Ltd.), and bis(etha-5-2,4-cyclopentadiene-1-yl)bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phentyl] titanium (Metallocene-based photoinitiator) (IRGACURE 784, manufactured by Ciba Specialty Chemicals Co., Ltd.).
  • MAPO-base photoinitiator DAROCUR TPO, manufactured by Ciba Specialty Chemicals Co., Ltd.
  • FIG. 2 which is a graph showing the absorbance of the photoinitiator (IRGACURE 819) versus wavelength, it can be seen that the photoinitiator exhibits a maximum absorbance peak at a wavelength of about 300 nm and then exhibits an absorbance peak at a wavelength of 380 ⁇ 460 nm. Therefore, it can be seen that the radical formation reaction can be carried out easily even within this range.
  • liquid crystal, dye, oligomer and monomer included in the liquid crystal composition of the present invention may be the same as those included in a conventional crystal composition for manufacturing a PDLC type light control body.
  • the liquid crystal used in the liquid crystal composition for manufacturing a PDLC type light control body according to the present invention may be selected from 4-n-propyl-4'-cyanobiphenyl, 4-n-butyl-4'-cyanobiphenyl, 4-n-pentyl-4'-cyanobiphenyl, 4-n-heptyl-4'-cyanobiphenyl, 4-n-octyloxy-4'-cyanobiphenyl, 4-trans-propyl cyclohexyl cyanobenzene, 4-trans-butyl cyclohexyl cyanobenzene, 4-trans-pentyl cyclohexyl cyanobenzene, 4-trans-hexyl cyclohexyl cyanobenzene, 4-trans-heptyl cyclohexyl cyanobenzene, 4-cyanoheptyl-4'-trans-propylcyclohexylcarboxylate, 4-cyanoheptyl-4'-trans-butyl,
  • the dye may be selected from an azo dye, an anthraquinone dye, a phenylene dye, a mellocyanine dye, an azomethine dye, a phthaloperylene dye, an indigo dye, an azulene dye, a dioxazine dye, a polythiophene dye, and combinations thereof.
  • the dye may be used independently or by the combination thereof. Concretely, examples of the dye are disclosed in the document “Dichroic Dyes for Liquid Crystal Display (written by A.V. Ivashchenko, CRC Corp., 1994).
  • Examples of the dye may include an azo dye, an anthraquinone dye and a perylene dye, more preferably, an azo dye and an anthraquinone dye.
  • Examples of the azo dye may include a monoazo dye, a bisazo dye, a trisazo dye, a tetrakisazo dye and a pentakisazo dye, preferably, a monoazo dye, a bisazo dye and a trisazo dye.
  • the azo dye has a ring structure, and examples of the ring structure may include aromatic carbon rings (a benzene ring, a naphthalene ring and the like) and heterocyclic rings (a quinoline ring, a pyridine ring, a thiazole ring, a benzothiazole ring, an oxazole ring, a benzoxazole ring, an imidazole ring, a benzoimidazole ring, a pyrimidine ring and the like).
  • the anthraquinone dye may include an oxygen atom, a sulfur atom or a nitrogen atom as a substituent.
  • the anthraquinone dye may have an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylamino group or an arylamino group.
  • the substituent may be di-substituted, tri-substituted, or tetrakis-substituted, preferably, di-substituted or tri-substituted.
  • substitution position of the substituent may be 1,4-di-substituted, 1,5-di-substituted, 1,4,5-tri-substituted, 1,2,4-tri-substituted, 1,2,5-tri-substituted, 1,2,4,5-tetra-substituted or 1,2,5,6-tetra-substituted.
  • the oligomer which is used to form a polymer matrix, may be selected from alkyl-3-mercaptopropionate, alkylthiocolate, alkylthiol, a urethane oligomer having one or more allyl groups, a urethane acrylate oligomer, a polyester acrylate oligomer, an epoxy acrylate oligomer, and combinations thereof.
  • the monomer may include monofunctional or multifunctional monomers, vinyl ether monomers and combinations thereof.
  • examples of the monomer may include hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), 1,6-hexanediolacrylate (HDDA), tripropyleneglycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA), butanediol monovinyl ether, 1,4-cyclohexane dimethanol monovinyl ether, triethyleneglycol divinyl ether, and combinations thereof.
  • HEMA hydroxyethyl acrylate
  • HEMA hydroxyethyl methacrylate
  • HDDA 1,6-hexanediolacrylate
  • TPGDA tripropyleneglycol diacrylate
  • TMPTA trimethylolpropane triacrylate
  • butanediol monovinyl ether 1,4-cyclohexane dimethanol monovinyl ether, triethyleneglycol divinyl ether, and combinations thereof.
  • the liquid crystal composition may further include an antioxidant, an ultraviolet absorber, a surfactant, an antifoamer and the like.
  • the PDLC type light control body includes: two transparent substrates, each being provided thereon with a transparent electrode; and a light control layer formed between the two transparent substrates and including a polymer matrix and liquid crystal droplets dispersed in the polymer matrix, wherein the light control layer has a pendulum hardness of 30s or more, which is measured after removing one of the two transparent substrates. That is, in the PDLC type light control body of the present invention, the degree of curing of a polymer matrix is increased to such an extent that the pendulum hardness of the light control layer is 30s or more.
  • the haze of the PDLC type light control body is higher than that of a conventional light control body, so that the light blocking effect of the PDLC type light control body is improved, the relative contrast ratio of the PDLC type light control body when voltage is applied compared to when voltage is not applied becomes high, and the adhesion between a polymer matrix and transparent substrates is improved.
  • pendulum hardness is defined as the product of the number of vibrations and the period of vibration, and is used to measure the softness of a polymer matrix depending on the degree of cure of PDLC. In this case, as the softness of a polymer matrix increases, the pendulum hardness of the PDLC type light control body decreases.
  • the pendulum hardness of the PDLC type light control body is measured as follows. Concretely, the pendulum hardness thereof is measured using a pendulum hardness tester (Konig ref. 707KP, manufactured by Sheen Corp.) depending on ASTM D4366.
  • the Konig pendulum has a triangular form and a weight of 200 ⁇ 0.2 g.
  • the Konig pendulum is provided with a rotating shaft mounted thereon with two ball bearings having a diameter of 5 mm.
  • the value of the pendulum hardness is represented by second (s) which is a unit of time, and the period of vibration of the Konig pendulum is 1.4 ⁇ 0.02 sec.
  • the pendulum hardness is useful when measuring the softness of a sample.
  • this PDLC type light control body may be manufactured using the method of the present invention.
  • nematic liquid crystal compound E7, manufactured by Merk Corp.
  • Sudan Red azo red dye, manufactured by Sigma-Aldrich Corp.
  • NOA 65 urethane oligomer having allyl ether groups, manufactured by Noland Corp.
  • the prepared liquid crystal composition for manufacturing a PDLC type light control body was applied onto one side of a transparent substrate (175 ⁇ m, PET film, manufactured by Toray Fine Chemicals Co., Ltd.) provided with a transparent electrode layer (indium tin oxide (ITO) electrode layer) to a thickness of 20 ⁇ m to form a liquid crystal composition layer, and then another transparent substrate, which was the same as the transparent substrate provided with the transparent electrode layer, was placed onto the liquid crystal composition layer.
  • a transparent substrate (175 ⁇ m, PET film, manufactured by Toray Fine Chemicals Co., Ltd.
  • ITO indium tin oxide
  • a 405 nm LED lamp UV energy: 1040 mJ/cm 2
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared and a PDLC type light control body was manufactured in the same manner as in Example 1, except that 4 wt% of 1-hydroxy-cyclohexyl-phenylketone (Irgacure 184, manufactured by Ciba Specialty Chemicals Co., Ltd.), which is a short-wavelength photoinitiator, was used as the photoinitiator.
  • Irgacure 184 1-hydroxy-cyclohexyl-phenylketone
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared in the same manner as in Example 1, and a PDLC type light control body was manufactured in the same manner as in Example 1 except that the light that was used had a wavelength of 365 nm and was emitted from a 365 nm metal halide lamp (UV energy: 1050 mJ/cm 2 ) which is a light source.
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared in the same manner as in Example 1 except that 4 wt% of 1-hydroxy-cyclohexyl-phenylketone (Irgacure 184, manufactured by Ciba Specialty Chemicals Co., Ltd.), which is a short-wavelength photoinitiator, was used as the photoinitiator, and a PDLC type light control body was manufactured in the same manner as in Example 1 except that the light that was used had a wavelength of 365 nm and was emitted from a 365 nm metal halide lamp (UV energy: 1050 mJ/cm 2 ) which is a light source.
  • UV energy 1050 mJ/cm 2
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared and a PDLC type light control body was manufactured in the same manner as in Example 1, except that 1 wt% of Oil Blue (anthraquinone blue dye, manufactured by Sigma-Aldrich Corp.), which is a dichroic dye, was used as the dye.
  • Oil Blue anthraquinone blue dye, manufactured by Sigma-Aldrich Corp.
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared in the same manner as in Example 2, and a PDLC type light control body was manufactured in the same manner as in Example 2 except that the light that was used had a wavelength of 365 nm and was emitted from a 365 nm metal halide lamp (UV energy: 1050 mJ/cm 2 ) which is a light source.
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared and a PDLC type light control body was manufactured in the same manner as in Example 1, except that 1 wt% of Sudan Black (azo black dye, manufactured by Sigma-Aldrich Corp.), which is a dichroic dye, was used as the dye.
  • Sudan Black azo black dye, manufactured by Sigma-Aldrich Corp.
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared in the same manner as in Example 3, and a PDLC type light control body was manufactured in the same manner as in Example 2 except that the light that was used had a wavelength of 365 nm and was emitted from a 365 nm metal halide lamp (UV energy: 1050 mJ/cm 2 ) which is a light source.
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared and a PDLC type light control body was manufactured in the same manner as in Example 1, except that 1 wt% of a mixed dye in which the Sudan Red, Oil Blue and Sudan Black of Examples 1 to 3 are mixed at a ratio of 2:7:1 was used as the dye.
  • a liquid crystal composition for manufacturing a PDLC type light control body was prepared in the same manner as in Example 4, and a PDLC type light control body was manufactured in the same manner as in Example 2 except that the light that was used had a wavelength of 365 nm and was emitted from a 365 nm metal halide lamp (UV intensity: 75 mW/cm 2 , UV energy: 1050mJ/cm 2 ) which is a light source.
  • the absorbance spectra of the dyes and photoinitiators of Examples and Comparative Examples depending on wavelength were obtained using a Cary 3 Bio UV-visible spectrophotometer. Methylene chloride was diluted to a concentration of 0.02 g/L to prepare samples, and the absorbance of each of the samples was measured using a quartz cell having a length of 1 cm.
  • the peel adhesion strength, pendulum hardness, haze, contrast ratio and color difference of the PDLC type light control bodies manufactured in Examples 1 to 4 and Comparative Examples 1 to 6 were evaluated as follows, and the results thereof are given in Table 1 below.
  • the method of measuring the peel adhesion strength, pendulum hardness, haze, contrast ratio and color difference of the PDLC type light control body is as follows.
  • the peel adhesion strength of the PDLC type light control body was measured using a H5KS tester (manufactured by Tinus Olsen Corp.) depending on ASTM D3654.
  • the pendulum hardness of the PDLC type light control body was measured using a pendulum hardness tester (Konig ref. 707KP, manufactured by Sheen Corp.) according to ASTM D4366.
  • the Konig pendulum has a triangular form and a weight of 200 ⁇ 0.2 g.
  • the Konig pendulum is provided with a rotating shaft mounted thereon with two ball bearings having a diameter of 5 mm.
  • the value of pendulum hardness is represented by second (s) which is a unit of time, and the period of vibration of the Konig pendulum is 1.4 ⁇ 0.02 sec.
  • the pendulum hardness is useful when measuring the softness of a sample.
  • the off haze of and contrast ratio of the PDLC type light control body were measured using an Avaspec-2048 visible spectrometer (manufactured by Avantes Corp.).
  • a halogen lamp (Avalight-HAL, manufactured by Avantes Corp.) was used as a light source.
  • the color difference ( ⁇ E) of the PDLC type light control body was measured using a CM-3500D spectrophotometer (manufactured by Minolta Corp.) depending on CIE L * a * b * system (Commission International edel'Eclairage, 1976).
  • the color difference ( ⁇ E) thereof is calculated by the following Equation:
  • L * is represents lightness
  • a * and b * represent chromaticity coordinates.
  • the pendulum hardness of the light control layers in the PDLC type light control bodies of Examples 1 to 4 were 42s, 49s, 31s and 45s, respectively, and thus they were sufficiently photocured to such a degree that the pendulum hardness thereof meets 30s or more, and that the PDLC type light control bodies of Examples 1 to 4 exhibited more excellent peel adhesion strength, haze and contrast ratio than those of the PDLC type light control bodies of Comparative Examples 1 to 6 in which a short-wavelength photoinitiator was used and a photocuring process was conducted using the light having a wavelength of 365 nm emitted from a metal halide lamp as a light source.

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Abstract

L'invention concerne un procédé de fabrication d'un corps de commande de lumière de type PDLC à l'aide de lumière ayant une grande longueur d'onde comprenant les étapes consistant à : préparer une composition de cristaux liquides pour fabriquer le corps de commande de lumière de type PDLC ; appliquer la composition de cristaux liquides entre deux substrats transparents, qui portent chacun une couche d'électrode transparente, afin de former une couche de composition de cristaux liquides entre les deux substrats ; et irradier la couche de composition de cristaux liquides formée entre les deux substrats transparents avec une lumière ayant une longueur d'onde située dans la plage allant de 380 à 460 nm afin de photopolymériser la couche de composition de cristaux liquides.
PCT/KR2010/008573 2009-12-03 2010-12-02 Procédé de fabrication d'un corps de commande de lumière de type pdlc à l'aide d'une lumière de grande longueur d'onde, corps de commande de lumière de type pdlc WO2011068365A2 (fr)

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KR1020090118867A KR101424185B1 (ko) 2009-12-03 2009-12-03 장파장 광을 이용한 ｐｄｌｃ형 조광체의 제조방법 및 ｐｄｌｃ형 조광체

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Cited By (5)

* Cited by examiner, † Cited by third party
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CN104335108A (zh) * 2012-03-21 2015-02-04 Q-Sys有限公司 使用镍基电极的聚合物分散液晶型光控体及其制备方法
CN105316003A (zh) * 2015-11-20 2016-02-10 广东工业大学 一种柔性太阳能保温液晶聚合物薄膜及其制作方法
EP3022273A4 (fr) * 2013-07-18 2017-03-15 Saint-Gobain Glass France Composition polymère à cristaux liquides, procédé pour sa préparation et objet à cristaux liquides la comprenant
CN113265219A (zh) * 2021-06-16 2021-08-17 深圳市撒比斯科技有限公司 一种pdlc电致变色薄膜用uv胶黏剂及其制备方法
US20240084197A1 (en) * 2022-08-19 2024-03-14 Electronics And Telecommunications Research Institute Display device including transmittance control display

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KR102161620B1 (ko) 2014-09-30 2020-10-06 엘지디스플레이 주식회사 편광제어 유닛
KR101887670B1 (ko) 2016-01-25 2018-08-10 주식회사 하성이노스 내후성 및 열차단 성능이 향상된 조광필름용 자외선 경화형 조성물 및 이에 의해 형성된 조광필름
JP7073635B2 (ja) * 2017-06-15 2022-05-24 凸版印刷株式会社 調光フィルム、および調光装置、並びにスクリーン
JP7222177B2 (ja) * 2018-01-30 2023-02-15 凸版印刷株式会社 調光フィルム、調光デバイスおよび調光装置

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CN104335108A (zh) * 2012-03-21 2015-02-04 Q-Sys有限公司 使用镍基电极的聚合物分散液晶型光控体及其制备方法
JP2015518174A (ja) * 2012-03-21 2015-06-25 キュー−シス カンパニー リミテッド ニッケル系電極を用いた高分子分散液晶型調光体およびその製造方法
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EP3022273A4 (fr) * 2013-07-18 2017-03-15 Saint-Gobain Glass France Composition polymère à cristaux liquides, procédé pour sa préparation et objet à cristaux liquides la comprenant
CN105316003A (zh) * 2015-11-20 2016-02-10 广东工业大学 一种柔性太阳能保温液晶聚合物薄膜及其制作方法
CN113265219A (zh) * 2021-06-16 2021-08-17 深圳市撒比斯科技有限公司 一种pdlc电致变色薄膜用uv胶黏剂及其制备方法
CN113265219B (zh) * 2021-06-16 2023-03-14 深圳市撒比斯科技有限公司 一种pdlc电致变色薄膜用uv胶黏剂及其制备方法
US20240084197A1 (en) * 2022-08-19 2024-03-14 Electronics And Telecommunications Research Institute Display device including transmittance control display
US12209216B2 (en) * 2022-08-19 2025-01-28 Electronics And Telecommunications Research Institute Display device including transmittance control display

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