WO2017110737A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

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Publication number
WO2017110737A1
WO2017110737A1 PCT/JP2016/087770 JP2016087770W WO2017110737A1 WO 2017110737 A1 WO2017110737 A1 WO 2017110737A1 JP 2016087770 W JP2016087770 W JP 2016087770W WO 2017110737 A1 WO2017110737 A1 WO 2017110737A1
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WIPO (PCT)
Prior art keywords
light
wavelength conversion
reducing member
layer
light source
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PCT/JP2016/087770
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English (en)
Japanese (ja)
Inventor
浩史 遠山
亮 佐竹
隆 米本
達也 大場
翔 筑紫
Original Assignee
富士フイルム株式会社
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Priority claimed from JP2016016095A external-priority patent/JP6442423B2/ja
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2017110737A1 publication Critical patent/WO2017110737A1/fr
Priority to US16/012,340 priority Critical patent/US20180314102A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements

Definitions

  • the present invention relates to an illumination device used for a backlight of a liquid crystal display device.
  • LCDs Liquid crystal display devices
  • LCDs consume less power and are increasingly used year by year as space-saving image display devices. Further, in recent liquid crystal display devices, further power saving, color reproducibility improvement and the like are required as LCD performance improvement.
  • LCD is an abbreviation for (Liquid Crystal Display).
  • the wavelength conversion member using a quantum dot is known as a wavelength conversion member.
  • a quantum dot is a crystal in an electronic state in which the direction of movement is restricted in all three dimensions.
  • the nanoparticle Becomes a quantum dot.
  • Quantum dots exhibit various quantum effects. For example, the “quantum size effect” in which the density of states of electrons (energy level) is discretized appears. According to this quantum size effect, the absorption wavelength and emission wavelength of light can be controlled by changing the size of the quantum dot.
  • Patent Document 1 as a lighting device (light emitting device) used for a direct type backlight or the like, a light source, a light diffusing member that covers a plurality of light sources in common, and a region corresponding to each light source, An apparatus having a wavelength conversion member using a quantum dot or the like that converts first wavelength light from a light source into second wavelength light is disclosed.
  • Patent Document 1 also discloses that a blue LED (Light Emitting Diode) is used as a light source.
  • a blue LED Light Emitting Diode
  • the distance between the light source and the wavelength conversion member is short.
  • the wavelength conversion member is often easily damaged by light or heat, and the wavelength conversion member is deteriorated by heat and light from the light source over time.
  • the wavelength conversion member is greatly deteriorated due to excessive light and heat because the light source generates much heat and the illuminance of light is high.
  • the conventional illumination device using the wavelength conversion member has a problem that it becomes impossible to irradiate light of a target light amount over the entire surface in a plane direction due to long-term use.
  • An object of the present invention is to solve such problems of the prior art, and can prevent deterioration of the wavelength conversion layer due to light and heat from the light source, and has high durability and long life. Is to provide.
  • the illumination device of the present invention includes one or more point light sources, a wavelength conversion member, one or more light quantity reduction members disposed between the point light source and the wavelength conversion member, Have The light quantity reducing member reduces the peak illuminance of the light emitted from the point light source on the light incident surface of the wavelength conversion member by 10 to 80%, and absorbs light having a wavelength of 450 nm measured using an integrating sphere.
  • a lighting device characterized in that the rate is less than 5%.
  • the light amount reducing member reduces the illuminance of light incident on the wavelength conversion member by diffusion or total surface reflection.
  • the total area of the light quantity reducing members is preferably 0.1 to 80% of the area of the light incident surface of the wavelength conversion member.
  • the distance of a wavelength conversion member and a light quantity reduction member is less than 50% of the distance of a point light source and a wavelength conversion member.
  • the light quantity reduction member is in contact with the wavelength conversion member.
  • the point light source is preferably a blue light emitting diode.
  • a lighting device having a wavelength conversion layer used for a backlight or the like of a liquid crystal display device deterioration of the wavelength conversion layer due to light and heat from a light source can be prevented, and durability is improved.
  • a high and long-life lighting device can be provided.
  • FIG. 1 is a diagram conceptually illustrating an example of a lighting device according to the present invention.
  • FIG. 2 is a diagram conceptually illustrating an example of a wavelength conversion member used in the illumination device of the present invention.
  • FIG. 3 is a conceptual diagram for explaining the operation of the light quantity reducing member in the illumination device of the present invention.
  • FIG. 4 is a conceptual diagram for explaining the method for measuring the peak illuminance reduction rate in the present invention.
  • FIG. 5 is a conceptual diagram for explaining a method of measuring the peak illuminance reduction rate in the present invention.
  • FIG. 6 is a diagram conceptually showing another example of the illumination device of the present invention.
  • FIG. 7 is a diagram conceptually showing another example of the illumination device of the present invention.
  • FIG. 8 is a diagram conceptually showing another example of the light amount reducing member used in the illumination device of the present invention.
  • a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • (meth) acrylate is used in the meaning of at least one of acrylate and methacrylate, or any one of them. The same applies to “(meth) acryloyl”.
  • the illuminating device 10 is a direct type planar illuminating device used for a backlight of a liquid crystal display device, and basically includes a housing 14, a wavelength conversion sheet 16 as a wavelength conversion member, and a point light source 18. And a light quantity reducing member 20.
  • liquid crystal display device is also referred to as LCD
  • point light source 18 is also referred to as “light source 18”.
  • FIG. 1 is a schematic diagram to the last. Accordingly, the lighting device 10 has various known members provided in a known lighting device such as an LCD backlight, such as one or more of an LED substrate, wiring, and heat dissipation mechanism, in addition to the illustrated members. May be.
  • the casing 14 is a rectangular casing whose maximum surface is open, and the wavelength conversion sheet 16 is disposed so as to close the open surface.
  • the housing 14 is a known housing that is used for an LCD backlight unit or the like.
  • the bottom surface used as the installation surface of the point light source 18 is a light reflection surface selected from a mirror surface, a metal reflective surface, a diffuse reflection surface, etc.
  • the entire inner surface of the housing 14 is a light reflecting surface.
  • the wavelength conversion sheet 16 is a known wavelength conversion sheet that receives light emitted from the light source 18, converts the wavelength, and emits the light.
  • FIG. 2 conceptually shows the configuration of the wavelength conversion sheet 16.
  • the wavelength conversion sheet 16 includes a wavelength conversion layer 26 and a support film 28 that sandwiches and supports the wavelength conversion layer 26.
  • the wavelength conversion layer 26 is a fluorescent layer in which a large number of phosphors are dispersed in a matrix such as a curable resin, and has a function of converting the wavelength of light incident on the wavelength conversion layer 26 and emitting it. It is what you have. For example, when blue light emitted from the light source 18 enters the wavelength conversion layer 26, the wavelength conversion layer 26 converts at least part of the blue light into red light or green light due to the effect of the phosphor contained therein. Convert and emit.
  • the blue light is light having an emission center wavelength in a wavelength band of 400 to 500 nm
  • the green light is light having an emission center wavelength in a wavelength band exceeding 500 nm and not more than 600 nm.
  • the light is light having an emission center wavelength in a wavelength band exceeding 600 nm and not more than 680 nm.
  • the wavelength conversion function expressed by the fluorescent layer is not limited to the configuration that converts the wavelength of blue light into red light or green light, as long as it converts at least part of incident light into light of a different wavelength. Good.
  • the phosphor is excited at least by incident excitation light and emits fluorescence.
  • the kind of the phosphor contained in the phosphor layer is not particularly limited, and various known phosphors may be appropriately selected according to the required wavelength conversion performance. Examples of such phosphors include phosphors, aluminates, phosphors doped with rare earth ions in phosphors, aluminates, metal oxides, metal sulfides, metal nitrides, etc. Illustrative examples include phosphors obtained by doping semiconductor ions with activating ions, phosphors utilizing the quantum confinement effect known as quantum dots, and the like.
  • a quantum dot having a narrow emission spectrum width capable of realizing a light source excellent in color reproducibility when used in a display, and excellent in light emission quantum efficiency is preferably used in the present invention. That is, in the present invention, as the wavelength conversion layer 26, a quantum dot layer formed by dispersing quantum dots in a matrix such as a resin is preferably used. Moreover, in the wavelength conversion sheet
  • quantum dots for example, paragraphs 0060 to 0066 of JP2012-169271A can be referred to, but are not limited to those described here.
  • the quantum dots commercially available products can be used without any limitation.
  • the emission wavelength of the quantum dots can usually be adjusted by the composition and size of the particles.
  • the quantum dots are preferably dispersed uniformly in the matrix, but may be dispersed with a bias in the matrix. Moreover, only 1 type may be used for a quantum dot and it may use 2 or more types together. When using 2 or more types of quantum dots together, you may use 2 or more types of quantum dots from which the wavelength of emitted light differs.
  • the known quantum dots include a quantum dot (A) having an emission center wavelength in the wavelength band exceeding 600 nm and in the range of 680 nm, and a quantum dot having an emission center wavelength in the wavelength band exceeding 500 nm and 600 nm.
  • (B) There is a quantum dot (C) having an emission center wavelength in a wavelength band of 400 to 500 nm.
  • the quantum dots (A) are excited by excitation light to emit red light, the quantum dots (B) emit green light, and the quantum dots (C) emit blue light.
  • red light emitted from the quantum dots (A) and light emitted from the quantum dots (B) are emitted.
  • White light can be realized by green light and blue light transmitted through the quantum dot layer.
  • red light emitted from the quantum dots (A), quantum dots (B) can be realized by green light emitted by the blue light and blue light emitted by the quantum dots (C).
  • quantum dot a so-called quantum rod or a tetrapod type quantum dot that has a rod shape and has directivity and emits polarized light may be used.
  • the wavelength conversion layer 26 is formed by dispersing quantum dots or the like using a resin or the like as a matrix.
  • various known matrices used for the quantum dot layer can be used as the matrix, but those obtained by curing a polymerizable composition (coating composition) containing at least two or more polymerizable compounds are preferable.
  • the polymerizable group of the polymerizable compound used in combination of at least two kinds may be the same or different.
  • the at least two kinds of compounds have at least one common polymerizable group. It is preferable to have.
  • the type of the polymerizable group is not particularly limited, but is preferably a (meth) acrylate group, a vinyl group or an epoxy group, or an oxetanyl group, more preferably a (meth) acrylate group, and still more preferably an acrylate group. It is.
  • the polymerizable compound that becomes the matrix of the wavelength conversion layer 26 is at least one of the first polymerizable compound made of a monofunctional polymerizable compound and at least one of the second polymerizable compound made of a polyfunctional polymerizable compound.
  • the first polymerizable compound and second polymerizable compound can be employed.
  • the first polymerizable compound is a monofunctional (meth) acrylate monomer and a monomer having one functional group selected from the group consisting of an epoxy group and an oxetanyl group.
  • Monofunctional (meth) acrylate monomers include acrylic acid and methacrylic acid, derivatives thereof, more specifically, (meth) acrylic acid polymerizable unsaturated bond (meth) acryloyl group in the molecule, alkyl Mention may be made of aliphatic or aromatic monomers whose group has 1 to 30 carbon atoms. Specific examples thereof include the following compounds, but the present invention is not limited thereto.
  • Aliphatic monofunctional (meth) acrylate monomers include methyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) acrylate, n-octyl ( Alkyl (meth) acrylates having 1 to 30 carbon atoms in the alkyl group, such as (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate; An alkoxyalkyl (meth) acrylate having 2 to 30 carbon atoms in the alkoxyalkyl group such as butoxyethyl (meth) acrylate; Aminoalkyl (meth) acrylates in which the total number of carbon atoms of the (monoalkyl or dialkyl) aminoalkyl group is 1-20, such as N, N-dimethylaminoe
  • aromatic monofunctional acrylate monomer examples include aralkyl (meth) acrylates having 7 to 20 carbon atoms in the aralkyl group such as benzyl (meth) acrylate.
  • aralkyl (meth) acrylates having 7 to 20 carbon atoms in the aralkyl group such as benzyl (meth) acrylate.
  • aliphatic or aromatic alkyl (meth) acrylates having an alkyl group with 4 to 30 carbon atoms are preferred, and n-octyl (meth) acrylate, lauryl (meth) acrylate are also preferred.
  • Examples of monofunctional epoxy compounds having one epoxy group include, for example, phenyl glycidyl ether, p-tert-butylphenyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, allyl glycidyl ether, 1,2-butylene oxide 1,3-butadiene monooxide, 1,2-epoxydodecane, epichlorohydrin, 1,2-epoxydecane, styrene oxide, cyclohexene oxide, 3-methacryloyloxymethylcyclohexene oxide, 3-acryloyloxymethylcyclohexene oxide, Examples include 3-vinylcyclohexene oxide and 4-vinylcyclohexene oxide.
  • the monofunctional oxetane compound having one oxetanyl group one obtained by appropriately replacing the epoxy group of the monofunctional epoxy compound described above with an oxetane group can be used.
  • a monofunctional compound can be appropriately selected from the oxetane compounds described in JP-A Nos. 2003-341217 and 2004-91556.
  • the first polymerizable compound is preferably contained in an amount of 5 to 99.9 parts by mass with respect to a total mass of 100 parts by mass of the first polymerizable compound and the second polymerizable compound, It is preferable that a part by mass is included. The reason will be described later.
  • the second polymerizable compound is a monomer having two or more functional groups selected from the group consisting of a polyfunctional (meth) acrylate monomer and an epoxy group and an oxetanyl group in the molecule.
  • the bifunctional (meth) acrylate monomers include neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9- Nonanediol di (meth) acrylate, 1,10-decanediol diacrylate, tripropylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycol di Preferred examples include (meth) acrylate, polyethylene glycol di (meth) acrylate, tricyclodecane dimethanol diacrylate, ethoxylated bisphenol A diacrylate, and the like.
  • the (meth) acrylate monomers having three or more functions include epichlorohydrin (ECH) modified glycerol tri (meth) acrylate, ethylene oxide (EO) modified glycerol.
  • ECH epichlorohydrin
  • EO ethylene oxide
  • a (meth) acrylate monomer having a urethane bond in the molecule specifically, an adduct of tolylene diisocyanate (TDI) and hydroxyethyl acrylate, isophorone diisocyanate (IPDI) and hydroxyethyl acrylate
  • TDI tolylene diisocyanate
  • IPDI isophorone diisocyanate
  • HDI hexamethylene diisocyanate
  • PETA pentaerythritol triacrylate
  • Monomers having two or more functional groups selected from the group consisting of epoxy groups and oxetanyl groups include, for example, aliphatic cyclic epoxy compounds, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, bromine Bisphenol A diglycidyl ether, brominated bisphenol F diglycidyl ether, brominated bisphenol S diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, hydrogenated bisphenol S diglycidyl ether, 1,4 -Butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin triglycidyl ether, trimethylolpropane triglycidyl ether , Polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ethers; polyether
  • a monomer having two or more functional groups selected from the group consisting of an epoxy group and an oxetanyl group may be produced by any method.
  • Maruzen KK Publishing Co., Ltd., Fourth Edition Experimental Chemistry Course 20 Organic Synthesis II, 213, 1992, Ed.by Alfred Hasfner The chemistry of heterocyclic compounds-Small Ring Heterocycles part3 Oxiranes, John & Wiley and Sons, An Interscience Publication, New York, 1985, Yoshimura, Adhesion, Vol. 29, No. 12, 32, 1985, Yoshimura, Adhesion, Vol. 30, No. 5, 42, 1986, Yoshimura, Adhesion, Vol. 30, No. 7, 42, 1986, Japanese Patent Laid-Open No. 11-100308, Japanese Patent No. 2906245, Japanese Patent No. 2926262, etc. Can be synthesized.
  • the second polymerizable compound is preferably contained in an amount of 0.1 to 95 parts by mass with respect to a total mass of 100 parts by mass of the first polymerizable compound and the second polymerizable compound, and 15 to 80 parts by mass. Parts are preferably included. The reason will be described later.
  • the matrix that forms the wavelength conversion layer 26, in other words, the polymerizable composition that becomes the wavelength conversion layer 26 may include necessary components such as a viscosity modifier and a solvent, if necessary.
  • the polymerizable composition that becomes the wavelength conversion layer 26 is, in other words, a polymerizable composition for forming the wavelength conversion layer 26.
  • the polymerizable composition may contain a viscosity modifier as necessary.
  • the viscosity modifier is preferably a filler having a particle size of 5 to 300 nm.
  • the viscosity modifier is preferably a thixotropic agent for imparting thixotropic properties.
  • thixotropic property refers to the property of reducing the viscosity with respect to an increase in shear rate in a liquid composition
  • the thixotropic agent refers to a thixotropy in a composition by including it in the liquid composition. It refers to a material having a function of imparting sex.
  • thixotropic agents include fumed silica, alumina, silicon nitride, titanium dioxide, calcium carbonate, zinc oxide, talc, mica, feldspar, kaolinite (kaolin clay), pyrophyllite (waxite clay), and sericite.
  • sericite bentonite, smectite vermiculites (montmorillonite, beidellite, nontronite, saponite, etc.), organic bentonite, organic smectite and the like.
  • the polymerizable composition for forming the wavelength conversion layer 26 has a viscosity of 3 to 50 mPa ⁇ s when the shear rate is 500 s ⁇ 1 , and preferably 100 mPa ⁇ s or more when the shear rate is 1 s ⁇ 1 .
  • a thixotropic agent In order to adjust the viscosity in this way, it is preferable to use a thixotropic agent.
  • the reason why the viscosity of the polymerizable composition is preferably 3 to 50 mPa ⁇ s when the shear rate is 500 s ⁇ 1 , and preferably 100 mPa ⁇ s or more when the shear rate is 1 s ⁇ 1 is as follows.
  • a manufacturing method including a step of forming a wavelength conversion layer 26 by curing the polymerizable composition after applying another composition film 28 on the applied polymerizable composition after applying the composition.
  • the support film 28 to which the polymerizable composition is applied is a first substrate
  • another support film 28 that is attached to the polymerizable composition applied to the first substrate is a second substrate. Also called a substrate.
  • the coating film is uniformly coated so that no coating stripes are formed when the polymerizable composition is applied to the first substrate, and the coating film thickness is uniform.
  • the polymerizable composition has a low viscosity.
  • the resistance to pressure at the time of pasting is performed in order to uniformly bond the second base material.
  • the polymerizable composition has a high viscosity.
  • the aforementioned shear rate 500 s ⁇ 1 is a representative value of the shear rate applied to the polymerizable composition applied to the first substrate, and the shear rate 1 s ⁇ 1 is obtained by attaching the second substrate to the polymerizable composition. This is a representative value of the shear rate applied to the polymerizable composition immediately before combining.
  • the shear rate 1 s ⁇ 1 is merely a representative value.
  • the polymerizable composition is used as long as the first substrate and the second substrate are bonded while being transported at the same speed.
  • the shear rate applied to is approximately 0 s ⁇ 1 , and the shear rate applied to the polymerizable composition in the actual production process is not limited to 1 s ⁇ 1 .
  • the shear rate of 500 s ⁇ 1 is merely a representative value, and the shear rate applied to the polymerizable composition in the actual production process is not limited to 500 s ⁇ 1 .
  • the viscosity of the polymerizable composition is 3 when the representative shear rate applied to the polymerizable composition is 500 s -1 when the polymerizable composition is applied to the first substrate. 100 mPa ⁇ s or more when the representative value of shear rate applied to the polymerizable composition is 1 s ⁇ 1 immediately before the second substrate is bonded onto the polymerizable composition applied to the first substrate. It is preferable to adjust so that it is.
  • the polymerizable composition to be the wavelength conversion layer 26 may contain a solvent as necessary.
  • the type and amount of the solvent used are not particularly limited.
  • one or a mixture of two or more organic solvents can be used as the solvent.
  • the polymerizable composition that becomes the wavelength conversion layer 26 includes trifluoroethyl (meth) acrylate, pentafluoroethyl (meth) acrylate, (perfluorobutyl) ethyl (meth) acrylate, and perfluorobutyl-hydroxypropyl (meth). It may contain a compound having a fluorine atom, such as acrylate, (perfluorohexyl) ethyl (meth) acrylate, octafluoropentyl (meth) acrylate, perfluorooctylethyl (meth) acrylate, tetrafluoropropyl (meth) acrylate and the like. . By including these compounds, the coating property can be improved.
  • the polymerizable composition to be the wavelength conversion layer 26 may contain a hindered amine compound as necessary.
  • the hindered amine compound include 2,2,6,6-tetramethyl-4-piperidylbenzoate, N- (2,2,6,6-tetramethyl-4-piperidyl) dodecylsuccinimide, 1-[( 3,5-ditert-butyl-4-hydroxyphenyl) propionyloxyethyl] -2,2,6,6-tetramethyl-4-piperidyl- (3,5-ditert-butyl-4-hydroxyphenyl) propionate Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis (1,2,2,6, 6-pentamethyl-4-piperidyl) -2-butyl-2- (3,5-ditert-butyl-4-hydroxybenzyl) malonate,
  • the amount of the resin serving as a matrix may be appropriately determined according to the type of functional material included in the wavelength conversion layer 26 and the like.
  • the resin serving as a matrix is preferably 90 to 99.9 parts by mass, and 92 to 99 parts by mass with respect to 100 parts by mass of the total amount of the quantum dot layer. Is more preferable.
  • the thickness of the wavelength conversion layer 26 is preferably 5 to 200 ⁇ m, and more preferably 10 to 150 ⁇ m, from the viewpoint of handleability and light emission characteristics.
  • the said thickness of the wavelength conversion layer 26 intends an average thickness, and average thickness calculates
  • a polymerization initiator such as a silane coupling agent, etc.
  • a silane coupling agent such as a silane coupling agent
  • the support film 28 various film-like materials (sheet-like materials) that can support the wavelength conversion layer 26 and the polymerizable composition that becomes the wavelength conversion layer 26 can be used.
  • the support film 28 is preferably a so-called gas barrier film in which a gas barrier layer that does not allow oxygen or the like to pass through is formed on the surface of the support substrate. That is, it is preferable that the support film 28 also functions as a member that covers the main surface of the wavelength conversion layer 26 and suppresses intrusion of moisture and oxygen from the main surface of the wavelength conversion layer 26.
  • the support films 28 on both main surfaces of the wavelength conversion layer 26 are gas barrier films, but the present invention is not limited to this.
  • the support film 28 is a gas barrier film only on one main surface of the wavelength conversion layer 26. May be.
  • the support films 28 on both main surfaces of the wavelength conversion layer 26 as gas barrier films, as shown in the illustrated example.
  • the support film 28 is preferably a gas barrier film.
  • the support film 28 preferably has a water vapor permeability of 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ day) or less.
  • the support film 28 preferably has an oxygen permeability of 1 ⁇ 10 ⁇ 2 cc / (m 2 ⁇ day ⁇ atm) or less.
  • the water vapor permeability was measured by the Mocon method under the conditions of a temperature of 40 ° C. and a relative humidity of 90% RH. Further, when the water vapor permeability exceeds the measurement limit of the Mocon method, it may be measured by the calcium corrosion method (the method described in JP-A-2005-283561) under the same conditions. Moreover, what is necessary is just to measure oxygen permeability on the conditions of temperature 25 degreeC and humidity 60% RH using the measuring apparatus (Nippon API company) by APIMS method (atmospheric pressure ionization mass spectrometry) as an example.
  • the thickness of the support film 28 is preferably 5 to 100 ⁇ m, more preferably 10 to 70 ⁇ m, and particularly preferably 15 to 55 ⁇ m. Setting the thickness of the support film 28 to 5 ⁇ m or more is preferable in that the wavelength conversion layer 26 can be made uniform when the wavelength conversion layer 26 is formed between the two support films 28. Moreover, it is preferable at the point that the thickness of the whole wavelength conversion sheet
  • the support film 28 As the support film 28, as described above, various types of films that can support the wavelength conversion layer 26 and the polymerizable composition can be used, and various films having a desired gas barrier property can be used. is there.
  • the support film 28 is preferably transparent.
  • glass, a transparent inorganic crystalline material, a transparent resin material, or the like can be used.
  • the support film 28 may be a rigid sheet or a flexible film.
  • the support film 28 may be a long shape that can be wound, or may be a single-wafer shape that is preliminarily cut into predetermined dimensions.
  • gas barrier film When a gas barrier film is used as the support film 28, various known gas barrier films can be used.
  • an organic / inorganic structure formed by forming one or more combinations of an inorganic layer and an organic layer serving as a base (formation surface) of the inorganic layer as a gas barrier layer on the supporting substrate and the supporting substrate.
  • a laminated gas barrier film is preferably used.
  • An example is a gas barrier film having an organic layer on one surface of a support substrate, an organic layer on the surface of the organic layer, an inorganic layer as a base layer, and a combination of an inorganic layer and a base organic layer. Is done.
  • an organic layer is provided on one surface of the support substrate, an inorganic layer is provided on the surface of the organic layer, and the second organic layer is provided on the inorganic layer.
  • examples thereof include a gas barrier film having two combinations of an inorganic layer and a base organic layer, the second organic layer having an organic layer as a base layer as a base layer.
  • a gas barrier film having three or more combinations of an inorganic layer and a base organic layer can also be used. Basically, the higher the combination of the inorganic layer and the underlying organic layer, the higher the gas barrier property.
  • the inorganic layer mainly exhibits gas barrier properties.
  • “organic / inorganic laminated gas barrier film” is also referred to as “laminated barrier film”. Therefore, when a laminated barrier film is used as the support film 28 of the wavelength conversion sheet 16, the uppermost layer, that is, the outermost layer on the side opposite to the support substrate is used as the inorganic layer, and the inorganic layer is formed in any layer configuration.
  • the inner side, that is, the wavelength conversion layer 26 side is preferable.
  • various known gas barrier films used as a support can be used as the support substrate for the laminated barrier film.
  • films made of various plastics are preferably used in that they are easy to be thinned and lightened and are suitable for flexibility.
  • polyethylene polyethylene
  • PEN polyethylene naphthalate
  • PA polyethylene terephthalate
  • PVC polyvinyl chloride
  • PVA polyvinyl alcohol
  • PAN polyacrylonitrile
  • PI polyacrylonitrile
  • PC polycarbonate
  • PMMA polycarbonate
  • PMMA polyacrylate
  • PP polypropylene
  • PS polystyrene
  • ABS cycloolefin copolymer
  • COC cycloolefin polymer
  • COP resin film made of triacetyl cellulose
  • TAC triacetyl cellulose
  • the thickness of a support substrate is preferably about 10 to 100 ⁇ m.
  • the support substrate may be provided with functions such as antireflection, phase difference control, and light extraction efficiency improvement on the surface of such a plastic film.
  • the gas barrier layer mainly includes an inorganic layer that exhibits gas barrier properties and an organic layer that serves as a base layer for the inorganic layer.
  • the uppermost layer is an inorganic layer and the inorganic layer side is directed to the wavelength conversion layer 26 as described above.
  • the laminated barrier film may have an organic layer for protecting the inorganic layer as the uppermost layer, if necessary.
  • a laminated type barrier film may have an organic layer for ensuring adhesiveness with the wavelength conversion layer 26 in the uppermost layer as needed.
  • the organic layer for ensuring the adhesion may also act as a protective layer for the inorganic layer.
  • the organic layer is a base layer of an inorganic layer that mainly exhibits gas barrier properties in the laminated barrier film.
  • Various organic layers that are used as organic layers in known laminated barrier films can be used.
  • the organic layer is a film containing an organic compound as a main component, and basically formed by crosslinking monomers and / or oligomers.
  • the multilayer barrier film has an organic layer that is the base of the inorganic layer, so that the surface irregularities of the support substrate and foreign matter adhering to the surface are embedded, so that the film-forming surface of the inorganic layer is properly it can.
  • an appropriate inorganic layer can be formed on the entire surface of the film formation without gaps and without cracks or cracks.
  • the water vapor permeability is as high as 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ day) or less and the oxygen permeability is 1 ⁇ 10 ⁇ 2 cc / (m 2 ⁇ day ⁇ atm) or less.
  • Gas barrier properties can be obtained.
  • the laminated barrier film since the laminated barrier film has an organic layer serving as the base, the organic layer also functions as a cushion for the inorganic layer. Therefore, when the inorganic layer receives an impact from the outside, damage to the inorganic layer can be prevented by the cushion effect of the organic layer. Thereby, in a laminated type barrier film, an inorganic layer expresses gas barrier property appropriately, and deterioration of the wavelength conversion layer 26 by water
  • various organic compounds can be used as the material for forming the organic layer.
  • polyester acrylic resin, methacrylic resin, methacrylic acid-maleic acid copolymer, polystyrene, transparent fluororesin, polyimide, fluorinated polyimide, polyamide, polyamideimide, polyetherimide, cellulose acylate, polyurethane, poly Ether ether ketone, polycarbonate, alicyclic polyolefin, polyarylate, polyether sulfone, polysulfone, fluorene ring modified polycarbonate, alicyclic modified polycarbonate, fluorene ring modified polyester, acryloyl compound, thermoplastic resin, or polysiloxane, etc.
  • An organic silicon compound film is preferably exemplified. A plurality of these may be used in combination.
  • an organic layer composed of a polymer of a radical polymerizable compound and / or a cationic polymerizable compound having an ether group as a functional group is preferable in terms of excellent glass transition temperature and strength.
  • the glass transition temperature is 120 ° C. mainly composed of acrylate and / or methacrylate monomers or oligomer polymers in terms of low refractive index, high transparency and excellent optical properties.
  • the above acrylic resin and methacrylic resin are suitably exemplified as the organic layer.
  • DPGDA dipropylene glycol di (meth) acrylate
  • TMPTA trimethylolpropane tri (meth) acrylate
  • DPHA dipentaerythritol hexa (meth) acrylate
  • Acrylic resins and methacrylic resins which are mainly composed of a polymer of acrylate and / or methacrylate monomers or oligomers, are preferred. It is also preferable to use a plurality of these acrylic resins and methacrylic resins.
  • the inorganic layer can be formed on the base having a solid skeleton, so that a denser inorganic layer having a high gas barrier property can be formed.
  • the thickness of the organic layer is preferably 1 to 5 ⁇ m.
  • the thickness of the organic layer is more preferably 1 to 3 ⁇ m.
  • the thickness of each organic layer may be the same or different from each other.
  • the material for forming each organic layer may be the same or different. However, in terms of productivity and the like, it is preferable to form all organic layers with the same material.
  • the organic layer may be formed by a known method such as a coating method or flash vapor deposition. Moreover, in order to improve adhesiveness with the inorganic layer used as the lower layer of an organic layer, it is preferable that an organic layer contains a silane coupling agent.
  • An inorganic layer is a film
  • membrane which has an inorganic compound as a main component, and mainly expresses the gas barrier property in a lamination type barrier film.
  • metal oxides such as aluminum oxide, magnesium oxide, tantalum oxide, zirconium oxide, titanium oxide, and indium tin oxide (ITO); metal nitrides such as aluminum nitride; metal carbides such as aluminum carbide; silicon oxide, Silicon oxides such as silicon oxynitride, silicon oxycarbide and silicon oxynitride carbide; silicon nitrides such as silicon nitride and silicon nitride carbide; silicon carbides such as silicon carbide; hydrides thereof; mixtures of two or more of these; and Films made of inorganic compounds such as these hydrogen-containing materials are preferably exemplified.
  • silicon is also regarded as a metal.
  • a film made of a silicon compound such as silicon oxide, silicon nitride, silicon oxynitride and silicon oxide is preferably exemplified in that it has high transparency and can exhibit excellent gas barrier properties.
  • a film made of silicon nitride is preferable because it has high transparency in addition to more excellent gas barrier properties.
  • the materials for forming the inorganic layers may be different from each other. However, if productivity etc. are considered, it is preferable to form all the inorganic layers with the same material.
  • the thickness of the inorganic layer is preferably 10 to 200 nm.
  • the inorganic layer is generally brittle, and if it is too thick, there is a possibility of causing cracks, cracks, peeling, etc., but by making the thickness of the inorganic layer 200 nm or less, generation of cracks can be prevented. .
  • the thickness of the inorganic layer is preferably 10 to 100 nm, and more preferably 15 to 75 nm.
  • the thickness of each inorganic layer may be the same or different.
  • the inorganic layer may be formed by a known method depending on the forming material. Specifically, CCP (Capacitively Coupled Plasma Plasma) -CVD (Chemical Vapor Deposition) and ICP (Inductively Coupled Plasma Inductively Coupled Plasma) -CVD and other plasma CVD, sputtering such as magnetron sputtering and reactive sputtering, vacuum deposition
  • CCP Capacitively Coupled Plasma Plasma
  • CVD Chemical Vapor Deposition
  • ICP Inductively Coupled Plasma Inductively Coupled Plasma
  • sputtering such as magnetron sputtering and reactive sputtering
  • vacuum deposition a vapor deposition method is preferably exemplified.
  • the wavelength conversion sheet 16 covers the end surface with an end surface sealing layer made of a material that exhibits gas barrier properties. Thereby, oxygen or the like can be prevented from entering the wavelength conversion layer 26 from the end face of the wavelength conversion sheet 16.
  • an end face sealing layer a metal layer such as a plating layer, an inorganic compound layer such as a silicon oxide layer and / or a silicon nitride layer, a resin layer made of a resin material such as an epoxy resin or a polyvinyl alcohol resin, or the like, such as oxygen or moisture
  • a metal layer such as a plating layer, an inorganic compound layer such as a silicon oxide layer and / or a silicon nitride layer, a resin layer made of a resin material such as an epoxy resin or a polyvinyl alcohol resin, or the like, such as oxygen or moisture
  • a resin material such as an epoxy resin or a polyvinyl alcohol resin, or the like
  • the end face sealing layer may have a multilayer structure such as a structure composed of a base metal layer and a plating layer, or a structure having a lower layer (wavelength conversion sheet 16 side) polyvinyl alcohol layer and an upper epoxy resin layer. Good.
  • a (point) light source 18 is disposed at the center position of the bottom surface inside the housing 14.
  • the light source 18 is a light source of light emitted from the lighting device 10.
  • Various known point light sources can be used as the light source 18 as long as the light source 18 emits light having a wavelength that is converted by the wavelength conversion sheet 16 (wavelength conversion layer 26).
  • an LED Light Emitting Diode
  • a quantum dot layer formed by dispersing quantum dots in a matrix such as a resin is preferably used as the wavelength conversion layer 26 of the wavelength conversion sheet 16.
  • a blue LED blue light emitting diode that emits blue light
  • a blue LED having a peak wavelength of 450 nm ⁇ 50 nm is preferably used.
  • the output of the light source 18 is not particularly limited, and may be appropriately set according to the illuminance (luminance) of light required for the illuminating device 10.
  • the light emission characteristics of the light source 18 such as the peak wavelength, the illuminance profile, and the full width at half maximum are not particularly limited, and the size of the illumination device 10, the distance between the light source 18 and the wavelength conversion sheet 16, and the characteristics of the wavelength conversion layer 26. What is necessary is just to set suitably according to the space
  • the light which the light source 18 irradiates has high directivity.
  • the light source 18 preferably has a full width at half maximum (luminance half-value angle) of 70 ° or less, and more preferably 65 ° or less.
  • the full width at half maximum of the light source 18 is set to 70 ° or less, the illuminance of the light radiated from the wavelength conversion sheet 16 can be increased. This is preferable in that the influence of the light source 18 can be reduced and the contrast in the screen can be made clear.
  • a light amount reducing member 20 is provided on the surface (inner surface) of the wavelength conversion sheet 16 on the housing 14 side, that is, on the light incident surface of the wavelength conversion sheet 16.
  • the “light incident surface of the wavelength conversion sheet 16” is also simply referred to as “light incident surface”.
  • the light quantity reducing member 20 is a sheet-like material attached to the light incident surface, which can be called a light quantity reducing layer.
  • the light quantity reducing member 20 (light quantity reducing member) is for reducing the peak illuminance of light irradiated by the light source 18 on the light incident surface by 10 to 80%. That is, as conceptually shown on the left side of FIG. 3, the peak illuminance of the irradiation light from the light source 18 on the light incident surface when the light amount reducing member 20 is not provided is set to 100%.
  • the light quantity reduction member 20 reflects and / or absorbs the light emitted from the light source 18 to change the peak illuminance on the light incident surface of the light emitted from the light source 18 as a light quantity as conceptually shown on the right side of FIG. When the reduction member 20 is not provided (100%), the reduction is 10 to 80%.
  • the light quantity reducing member 20 reflects and / or absorbs the light irradiated by the light source 18, and as shown conceptually in FIG. 3, the peak illuminance on the light incident surface of the light irradiated by the light source 18 is
  • the light quantity reducing member 20 is set to 20 to 90% with respect to the state (100%).
  • the “position” on the horizontal axis is a position in the surface direction on the light incident surface of the wavelength conversion sheet 16.
  • the “surface direction” is the surface direction of the light incident surface of the wavelength conversion sheet 16.
  • the illuminating device 10 of the present invention has such a light quantity reducing member 20, so that the wavelength conversion layer 26 caused by light incident on the wavelength conversion sheet 16, heat due to the incident light, and heat due to the light source 18 can be obtained. Deterioration is prevented and the long-life lighting device 10 having high durability is realized.
  • the LED has a high directivity of light, a high peak illuminance, and a large amount of heat generation.
  • the light source for irradiating the wavelength conversion layer has higher directivity. For this reason, deterioration of the wavelength conversion member due to incident light, heat due to the incident light, and heat due to the light source is particularly severe at the position of the peak illuminance on the incident surface of the wavelength conversion member where light with high illuminance is incident.
  • the illumination device used for a conventional backlight or the like cannot irradiate light of a target light amount over the entire surface in the plane direction over time.
  • the light emitted from the light source 18 is reflected and / or absorbed between the light source 18 and the wavelength conversion sheet 16, and the light on the light incident surface of the wavelength conversion sheet 16 is reflected.
  • a light quantity reducing member 20 that reduces the peak illuminance by 10 to 80% is provided. According to the present invention having such a configuration, light with excessively high illuminance, such as light with peak illuminance irradiated by the light source 18, does not enter the wavelength conversion layer 26 of the wavelength conversion sheet 16. Therefore, the deterioration of the wavelength conversion layer 26 caused by the light irradiated by the light source 18 and the heat of the incident light and the heat of the light source 18 can be prevented.
  • the reduction rate of the illuminance on the light incident surface of the light irradiated by the light source 18 by the light amount reducing member 20 is less than 10%, the light illuminance reduction effect on the light incident surface cannot be sufficiently obtained. As a result, it cannot be prevented that excessive light enters the wavelength conversion layer 26 and the wavelength conversion layer 26 deteriorates due to light, heat of light and heat of the light source 18.
  • the reduction rate of the illuminance on the light incident surface of the light irradiated by the light source 18 by the light amount reducing member 20 exceeds 80%, the illuminance (luminance) of the light irradiated by the illumination device 10 is lowered.
  • the reduction rate of the peak illuminance on the light incident surface of the light irradiated by the light source 18 by the light amount reducing member 20 is preferably 15 to 70%, and preferably 20 to 60%. More preferred.
  • the reduction rate of the peak illuminance on the light incident surface by the light quantity reducing member 20 is measured as follows with reference to “JIS C 8152: Measuring method of white light emitting diode (LED) for illumination”.
  • the distance L between the light source 18 and the light incident surface of the wavelength conversion sheet 16 in the illumination device 10 is measured.
  • a virtual light incident surface S (see FIG. 5) is placed according to the measured distance L and the positional relationship in the surface direction between the light source 18 and the light incident surface in the illumination device 10 by placing the light source 18 on the base 30. ) Is set.
  • the base 30 is the same surface as the installation surface of the light source 18 in the housing 14 or a surface having the same light reflectivity as the installation surface of the light source 18 in the housing 14. In general, the installation surface of the light source 18 of the lighting device 10 (the bottom surface of the housing 14) and the light incident surface are parallel.
  • the virtual light incident surface S has a surface parallel to the base 30 at a distance L from the measured light source 18 to the light incident surface, a positional relationship in the surface direction between the light source 18 and the light incident surface, and Depending on the shape and size of the light incident surface, it may be set.
  • the illuminometer 32 is arranged so that the distance from the light source 18 to the sensor 32a becomes the distance L from the light source 18 to the light incident surface, and the set virtual light is set.
  • the illuminance is measured by the illuminometer 32 on the incident surface S.
  • the sensor 32a of the illuminance meter 32 is provided with a light shielding plate 34 having a 1 ⁇ 1 mm square through hole 34a so that the center of the sensor 32a and the center of the through hole 34a coincide with each other. This area is shielded from light.
  • Examples of the illuminance meter 32 include VEGA manufactured by OPHIR.
  • This illuminance measurement is performed so that the intersection of the optical axis of the light source 18 and the virtual light incident surface S is included, and the measurement points (open circles) on the virtual light incident surface S are conceptually shown in FIG.
  • the distance a is two-dimensionally set to 1 mm, and the maximum illuminance value is defined as the peak illuminance I 0max on the light incident surface of the light emitted from the light source 18 when the light amount reducing member 20 is not provided.
  • the light amount reducing member 20 is disposed at the same position as the lighting device 10 with respect to the virtual light incident surface S according to the positional relationship between the light incident surface and the light amount reducing member 20 in the lighting device 10. Then, the illuminance is measured in the same manner as the measurement of the peak illuminance I 0max , and the maximum value of the illuminance is the peak at the light incident surface of the light emitted by the light source 18 when the light quantity reducing member 20 is arranged. The illuminance is I 1max .
  • the light quantity reduction member 20 when the light quantity reduction member 20 is contacting the light-incidence surface, the light quantity reduction member 20 is stuck on transparent films, such as PET film, and this film
  • transparent films such as PET film
  • the surface of the non-adhered surface of the light quantity reducing member 20 is arranged so as to coincide with the virtual light incident surface S, the illuminance on the non-adhered surface is measured with the illuminometer 32, and the peak illuminance I 1max is measured.
  • the measurement of the peak illuminance I 0max in the absence of the light quantity reducing member 20 is arranged such that the surface of one surface of the same film not attached with the light quantity reducing member 20 coincides with the virtual light incident surface S, This is done by measuring the illuminance on the surface corresponding to the virtual light incident surface S with the illuminometer 32.
  • Reduction rate of peak illuminance [%] [1 ⁇ (I 1max / I 0max )] ⁇ 100
  • the light intensity reducing member 20 can reduce the peak illuminance of the light incident surface of the light source 18 on the light incident surface by 10 to 80% compared to the case where the light amount reducing member 20 is not provided, the light reflectance and light transmittance.
  • the forming material There are no limitations on the forming material, the arrangement position in the surface direction, the arrangement position in the separation direction of the light source 18 and the wavelength conversion sheet 16, the area, the thickness, the configuration, the shape, etc., but according to the intensity distribution of the point light source It is preferable to adjust the shape and configuration. With such a configuration, it is easy to effectively reduce the amount of light from the point light source and achieve both the brightness and the life of the light to be irradiated.
  • the light reflectance is increased at a position immediately above the point light source or in the vicinity of the optical axis of the point light source, and the light reflectance at the peripheral portion is decreased.
  • the separation direction between the light source 18 and the wavelength conversion sheet 16 usually coincides with the direction of the optical axis of the light source 18.
  • the area of the light quantity reducing member 20 is, in other words, the size of the light quantity reducing member 20 in the surface direction.
  • the light quantity reducing member 20 can reduce the peak illuminance on the light incident surface of the light emitted from the light source 18 by 10 to 80% compared to the case where the light quantity reducing member 20 is not provided, and As long as the absorbance of light having a wavelength of 450 nm measured using an integrating sphere described later is less than 5%, there is no other limitation.
  • the light quantity reducing member 20 reflects and / or absorbs incident light by one or more optical actions such as diffuse reflection, interference reflection, specular reflection and total surface reflection, and absorption, and the like. The peak illuminance of light incident on the light incident surface is reduced.
  • action of the light reflection in the light quantity reduction member 20 is not limited to this.
  • examples of the light quantity reducing member 20 having a diffuse reflection effect include a diffusion layer formed by diffusing diffusing particles in a binder.
  • the light quantity reducing member 20 having an interference reflection function include a laminate of layers having different refractive indexes.
  • the light quantity reducing member 20 having a specular reflection function include a metal film.
  • the light quantity reducing member 20 having a surface total reflection effect include a structure having a prism structure.
  • the light amount reducing member 20 that performs diffuse reflection or total surface reflection is preferably used in terms of easy adjustment of the light amount reduction effect and easy formation.
  • a material constituting the light quantity reducing member 20 that performs diffuse reflection or total surface reflection a material that has low light absorption in the visible light region and is excellent in light resistance, heat resistance, and moisture resistance is preferable.
  • examples include sol-gel materials, epoxy resins, silicone resins, acrylic resins, polyolefin resins, polyester resins, polyamide resins, polyimide resins, polystyrene resins, cellulose derivative resins, and the like. These materials may be used alone, or may be used by dissolving a plurality of materials or by dispersing one in the other. About resin, you may use what superpose
  • a composition obtained by dispersing particles having different refractive indices in the above-described resin or the like is preferably exemplified.
  • Preferred examples of the particles include particles made of the above-described materials, metal oxides such as alumina, silica, titania, zirconia, and zinc oxide, and particles made of other metal compounds such as barium sulfate. A plurality of these particles may be used in combination. In order to enhance the dispersibility of the particles, the particle surface may be modified.
  • the material constituting the light quantity reducing member 20 that performs diffuse reflection or total surface reflection is polydimethylsiloxane, modified polydimethylsiloxane, ethylene glycol (meth) acrylate, urethane (meth) acrylate, alkyl (meta) ) Acrylate, polymethyl (meth) acrylate, polybutyl methacrylate, polyethylene, polypropylene, cycloolefin polymer, cycloolefin copolymer, polyester urethane, diacetylcellulose, triacetylcellulose and the like.
  • polydimethylsiloxane, polymethyl (meth) acrylate, urethane (meth) acrylate, polyester urethane and the like are particularly preferable from the viewpoint of excellent light resistance and heat resistance.
  • the composition serving as the material constituting the light quantity reducing member 20 preferably has a low solid content and a high viscosity.
  • a composition using a high molecular weight resin is suitable.
  • a composition contains the above-mentioned resin as high molecular weight resin.
  • the high molecular weight resin is preferably a resin having a weight average molecular weight of 40,000 to 10 million g / mol, more preferably a resin having a weight average molecular weight of 100,000 to 5,000,000 g / mol, and a weight average molecular weight. Of 500,000 to 3,000,000 g / mol is particularly preferable. If the weight average molecular weight is too low, the thickening effect on the solid content may not be sufficiently obtained. Conversely, if the weight average molecular weight is too high, application defects such as stringing are liable to occur.
  • the illuminance (luminance) of light incident on the wavelength conversion sheet 16 is significantly reduced at the position in the surface direction where the light amount reducing member 20 is disposed. Resulting in.
  • a diffuser plate and / or a prism sheet or the like is usually arranged corresponding to the light exit surface of the illumination device 10 to make the illuminance of light in the surface direction uniform. Is done. Therefore, a partial decrease in illuminance due to the light quantity reducing member 20 is not a problem in practice.
  • the light quantity reducing member 20 has an absorbance of light having a wavelength of 450 nm measured using an integrating sphere of less than 5%. is there. If the absorption rate of light at 450 nm by the light amount reducing member 20 is 5% or more, the light amount reducing member 20 absorbs light, and the light amount reducing member 20 deteriorates due to the absorbed light and heat generated by light absorption. End up. Further, when the light quantity reduction member 20 is close to the wavelength conversion sheet 16, or particularly when the light quantity reduction member 20 is in contact with the wavelength conversion sheet 16 as in the illustrated example, the heat of the light quantity reduction member 20.
  • the light amount reducing member 20 preferably has an absorption rate of light having a wavelength of 450 nm measured using an integrating sphere of less than 3%, and more preferably less than 1%.
  • the absorptance of light having a wavelength of 450 nm by the light quantity reducing member 20 measured using an integrating sphere is measured as follows.
  • the light quantity reducing member 20 to be measured is cut into a 2 ⁇ 2 cm square shape and placed in an integrating sphere, and the detection light intensity I at 450 nm when 450 nm excitation light is incident is measured.
  • the integrating sphere include an integrating sphere of an absolute PL quantum yield measuring apparatus (C9920-02) manufactured by Hamamatsu Photonics.
  • the detection light intensity I 0 at 450 nm when the blank 450 nm excitation light is incident is measured in the same manner except that the light quantity reduction member 20 is not disposed in the integrating sphere.
  • the light absorption rate A1 of light having a wavelength of 450 nm by the light quantity reducing member 20 is calculated by the following formula.
  • A1 (I 0 ⁇ I) / I 0
  • the area of the light quantity reducing member 20 is not particularly limited.
  • the area of the light amount reducing member 20 is preferably 0.1 to 80% with respect to the area of the light incident surface of the wavelength conversion sheet 16.
  • the illumination device 10 can irradiate light with sufficient luminance.
  • the area of the light quantity reducing member 20 is more preferably 0.3 to 50%, and particularly preferably 0.5 to 40% with respect to the area of the light incident surface.
  • the area of a light quantity reduction member shall be the sum total of the area of all the light quantity reduction members 20.
  • the position of the light quantity reducing member 20 in the direction in which the light source 18 and the wavelength conversion sheet 16 are separated is not particularly limited.
  • the separation direction between the light source 18 and the wavelength conversion sheet 16 in the illumination device 10 is also simply referred to as a “separation direction”.
  • the position in the separation direction of the light amount reducing member 20 is relative to the distance L in the separation direction between the light source 18 and the wavelength conversion sheet 16 described above.
  • the position where the distance between the light quantity reducing member 20 and the wavelength conversion sheet 16 in the separation direction is less than 50% is preferable, and the position where the distance is less than 30% is more preferable.
  • the light amount reducing member 20 is arranged on the wavelength conversion sheet 16 side in the separation direction from the L / 2 line shown in FIG.
  • the light quantity reduction member 20 is preferably provided in contact with the wavelength conversion sheet 16 as shown in the illustrated example.
  • the light source 18 preferably has high directivity. That is, it is the light of the peak illuminance of the light mainly emitted from the light source 18 that degrades the wavelength conversion layer 26. Therefore, in the present invention, the light intensity reducing member 20 reduces the peak illuminance of light irradiated by the light source 18 on the light incident surface by 10 to 80%. On the other hand, when the illuminance of light irradiated by the illumination device 10 is taken into consideration, the illuminance of light incident on the wavelength conversion sheet 16 is preferably higher. Therefore, in the present invention, it is most efficient to reduce only the peak illuminance by 10% or more on the light incident surface of the wavelength conversion sheet 16.
  • the light source 18 is a point light source and irradiates diffuse light although having high directivity. Therefore, when the light quantity reducing member 20 that reflects and / or absorbs light from the light source 18 is disposed near the light source 18, the area acting on the light irradiated by the light source 18 in the surface direction becomes relatively large, and the peak Light outside the region corresponding to the illuminance is also reflected and / or absorbed. That is, when the light quantity reducing member 20 is disposed near the light source 18, light that is preferably preferably not reflected and / or absorbed is also reflected and / or absorbed by the light quantity reducing member 20, thereby reducing the light utilization efficiency.
  • the illuminance of the light which the illuminating device 10 irradiates may fall.
  • the light quantity reducing member 20 is disposed near the light source 18, the light is reflected and diffused excessively in an unnecessary direction, and a lot of light is not preferable, such as a direction toward the side surface of the housing 14 or the like. As it progresses, the efficiency also decreases at this point.
  • the light quantity reducing member 20 is disposed near the light source 18, the light quantity reducing member 20 is likely to be deteriorated by light and heat.
  • the light quantity reducing member 20 acts on an unnecessary region of the light irradiated by the light source 18. Therefore, the light utilization efficiency can be improved, and the illuminance of the light emitted from the lighting device 10 can also be improved. Moreover, deterioration of the light quantity reducing member 20 due to heat can also be prevented.
  • the light amount reducing member 20 is provided in a layered manner with respect to the light incident surface in contact with the wavelength conversion sheet 16, so that the light amount reducing member 20 such as the optical axis of the light source 18 and the vicinity thereof is provided. It can be made to act only on a necessary area of light irradiated by the light source 18. As a result, unnecessary light reflection or the like can be prevented, the light use efficiency can be made extremely high, and the illuminance of the light irradiated by the illumination device 10 can be increased.
  • the light quantity reduction member 20 in contact with the wavelength conversion sheet 16 and forming a layer on the light incident surface, a member for supporting the light quantity reduction member 20 in the space between the light source 18 and the wavelength conversion sheet 16 is also unnecessary. Since it can do, the structure of the illuminating device 10 can be simplified, and also manufacture and arrangement
  • the position of the light amount reducing member 20 in the surface direction is not particularly limited.
  • the position of the peak illuminance of the light irradiated by the light source 18 on the light incident surface of the wavelength conversion sheet 16 usually coincides with the optical axis of the light source 18. Therefore, the light quantity reducing member 20 is preferably arranged at a position including the optical axis of the light source 18 in the surface direction. In other words, the light quantity reducing member 20 is preferably arranged at a position that intersects the optical axis of the light source 18.
  • Such a light quantity reducing member 20 can be produced by a known method according to the forming material. As in the illustrated example, when the light quantity reducing member 20 is in contact with the wavelength conversion sheet 16 (light incident surface), a vapor deposition such as a printing method such as an inkjet method, a coating method using a paint or the like, or vacuum deposition.
  • the light quantity reducing member 20 can be produced by a known film forming method according to the forming material, such as a film method or a method of attaching the light quantity reducing member 20 molded into a sheet shape.
  • the light quantity reducing member 20 may be manufactured by the printing method and the coating method by preparing a composition (paint) for forming the light quantity reducing member 20 using the resin, particles, or the like described above.
  • molded in the sheet form is also producible using the same composition as an example.
  • a known light quantity reducing member is produced by a known method according to the forming material, and the sheet-like object is held.
  • the light quantity reducing member may be held at a target position by a method.
  • the shape of the light quantity reducing member 20 may be an appropriate shape according to the lighting device 10, and is not particularly limited.
  • the illuminance at the central portion increases, and accordingly, the light amount (illuminance) of the region corresponding to the central portion (near the optical axis) of the light source 18 in the light amount reducing member 20
  • the reduction rate may be increased
  • the present invention is not limited to this. That is, the present invention may be a direct-type illumination device or may have a plurality of (three in the illustrated example) (point) light sources 18 like the illumination device 40 conceptually shown in FIG.
  • the light quantity reducing members 20 are provided individually corresponding to the respective light sources 18 as in the illuminating device 40 shown in FIG. 6. It is done.
  • FIG. 6 shows that the light quantity reducing members 20 are provided individually corresponding to the respective light sources 18 as in the illuminating device 40 shown in FIG. 6. It is done.
  • the illumination device 40 may have various known members such as one or more of an LED substrate, a wiring, and a heat dissipation mechanism in addition to the illustrated members. Is the same as that of the illumination device 10 shown in FIG.
  • the lighting device 10 shown in FIG. 1 and the lighting device 40 shown in FIG. 6 are so-called direct type lighting devices, but the present invention is not limited to this, and a so-called edge light type lighting device using a light guide plate. Moreover, it can be suitably used. An example is shown in FIG.
  • the light source 18 is supported by a support member 46 that is long in the direction perpendicular to the paper surface in the drawing.
  • a plurality of light sources 18 are arranged in the longitudinal direction of the support member 46, usually at regular intervals.
  • the support surface of the light source 18 of the support member 46 is preferably a light reflecting surface.
  • the wavelength conversion sheet 16 is also a long object in a direction perpendicular to the paper surface.
  • a plurality of light amount reduction members 20 are arranged in the longitudinal direction of the wavelength conversion sheet 16 so as to correspond to the light sources 18.
  • the light guide plate 48 is disposed with the end face serving as the light incident surface facing the light exit surface of the wavelength conversion sheet 16.
  • the illumination device 42 a part of the light emitted from the light source 18 is reflected and / or absorbed by the light amount reducing member 20, and the rest enters the wavelength conversion sheet 16.
  • the light incident on the wavelength conversion sheet 16 is wavelength-converted by the wavelength conversion layer 26, exits from the exit surface of the wavelength conversion sheet 16, and enters the entrance surface of the light guide plate 48.
  • the light incident on the light guide plate 48 is propagated in the light guide plate 48 and reflected by the reflection surface (not shown) provided in the light guide plate 48 or the light guide plate 48, so that the light emitting surface on the upper surface in the figure. Irradiated from.
  • the light quantity reduction member 20 is configured by an integral member that is not divided, that is, a single member.
  • the light quantity reducing member is integrated as long as it can reduce the peak illuminance on the light incident surface of the light emitted from the light source 18 by 10 to 80% compared to the case where the light quantity reducing member 20 is not provided. It is not limited to being constituted by one member, and one light quantity reducing member may be constituted by a plurality of divided members.
  • the light amount reducing member 20a corresponding to one light source 18 may be configured by forming a plurality of light reflecting members 50 like the light amount reducing member 20a conceptually shown in FIG.
  • Example 1 ⁇ Preparation of Support Film 28> A PET film (Toyobo Co., Ltd., Cosmo Shine A4300, thickness 50 ⁇ m) was prepared as a support substrate. This PET film has a mat layer on both sides. A barrier layer was formed on one side of the support substrate by the following procedure.
  • Trimethylolpropane triacrylate manufactured by Daicel Cytec Co., Ltd.
  • a photopolymerization initiator Liberti Co., Ltd., ESACURE KTO46
  • a coating solution having a solid content concentration of 15% was obtained.
  • This coating solution was applied to the support substrate by a roll-to-roll using a die coater, and passed through a 50 ° C. drying zone for 3 minutes. Thereafter, ultraviolet rays were irradiated in a nitrogen atmosphere (accumulated dose: about 600 mJ / cm 2 ), cured by UV curing to form an organic layer, and wound up.
  • the thickness of the organic layer formed on the support substrate was 1 ⁇ m.
  • “roll to roll” is also referred to as “RtoR”.
  • a silicon nitride layer was formed as an inorganic layer on the surface of the organic layer using an RtoR chemical vapor deposition apparatus (CVD apparatus).
  • source gases silane gas (flow rate 160 sccm), ammonia gas (flow rate 370 sccm), hydrogen gas (flow rate 590 sccm), and nitrogen gas (flow rate 240 sccm) were used.
  • a power source a high frequency power source having a frequency of 13.56 MHz was used.
  • the film forming pressure was 40 Pa, and the ultimate film thickness was 50 nm.
  • the above-mentioned laminated barrier film (organic / inorganic laminated gas barrier film) having an organic layer on the surface of a supporting substrate made of a PET film as the supporting film 28 and an inorganic layer on the organic layer.
  • Two support films 28 were produced.
  • the following quantum dot-containing polymerizable composition was prepared, filtered through a polypropylene filter having a pore diameter of 0.2 ⁇ m, dried under reduced pressure for 30 minutes, and used as a coating solution.
  • CZ520-100 manufactured by NN-Labs Co., Ltd. was used as a toluene dispersion of quantum dots 1 having an emission maximum wavelength of 535 nm.
  • CZ620-100 manufactured by NN-Labs was used as a toluene dispersion of quantum dots 2 having an emission maximum wavelength of 630 nm.
  • Quantum dot-containing polymerizable composition >> Toluene dispersion of quantum dots 1 (emission maximum: 535 nm) 10 parts by mass Toluene dispersion of quantum dots 2 (emission maximum: 630 nm) 1 part by weight Lauryl methacrylate 40 parts by weight Bifunctional methacrylate 4G (manufactured by Shin-Nakamura Chemical Co., Ltd.) 20 parts by mass Trifunctional acrylate TMPTA (manufactured by Daicel Cytec) 20 parts by mass Urethane acrylate UA-160TM (manufactured by Shin-Nakamura Kogyo Co., Ltd.) 10 parts by mass Silane coupling agent KBM-5103 (manufactured by Shin-Etsu Chemical Co., Ltd.) 10 parts by mass Photopolymerization initiator Irgacure 819 (manufactured by BASF) 1 part by mass
  • a single coat of the support film 28 prepared as described above is continuously conveyed by RtoR at a tension of 1 m / min and 60 N / m in the longitudinal direction, and a quantum dot-containing polymerizable composition is applied to the surface of the inorganic layer by a die coater.
  • a quantum dot-containing polymerizable composition is applied to the surface of the inorganic layer by a die coater.
  • the support film 28 on which the coating film is formed is wound around a backup roller, and another support film 28 is laminated on the coating film in such a direction that the inorganic layer is in contact with the coating film.
  • the film was passed through a heating zone at 100 ° C. for 3 minutes while being continuously conveyed with the coating film sandwiched therebetween.
  • the coating film is cured by irradiating ultraviolet rays, and the wavelength conversion layer 26 (quantum dot layer) is formed by the two support films 28.
  • the sandwiched wavelength conversion sheet 16 was produced.
  • the irradiation amount of ultraviolet rays was 2000 mJ / cm 2 .
  • ⁇ Light quantity reducing member 20> A white PET film (manufactured by Furukawa Electric Co., Ltd., MCPET-E3) having a thickness of 880 ⁇ m was cut out to 5 ⁇ 5 mm to obtain a light quantity reducing member 20.
  • ⁇ Production of lighting device 10> As the housing 14, a rectangular housing having one opening surface of 50 ⁇ 50 mm and a mirror surface on the inner surface was prepared. A blue LED (manufactured by Nichia Corporation, NSPB346KS, peak wavelength 450 nm, full width at half maximum of 55 °) was fixed as the light source 18 at the center of the bottom surface of the housing 14. On the other hand, the produced wavelength conversion sheet 16 was cut out to 50x50 mm. At the center of the wavelength conversion sheet 16, the light quantity reducing member 20 (5 ⁇ 5 mm) described above was attached using an adhesive (manufactured by 3M, highly transparent adhesive transfer tape 8146-2, thickness 50 ⁇ m). .
  • an adhesive manufactured by 3M, highly transparent adhesive transfer tape 8146-2, thickness 50 ⁇ m.
  • the area ratio of the light quantity reducing member 20 with respect to the area of the wavelength conversion sheet 16 (light incident surface) is 1%.
  • the open surface of the housing 14 was closed with the wavelength conversion sheet 16 to which the light quantity reducing member 20 was attached, and the lighting device 10 as shown in FIG. 1 was produced.
  • the distance L between the light source 18 and the light incident surface was 4 mm.
  • the light source 18 was placed on a base 30 that is the same mirror surface as the bottom surface of the housing 14.
  • a virtual light incident surface S is set at a position 4 mm perpendicular to the base 30 from the light source 18, and the peak illuminance I 0max and the peak illuminance I 1max are measured by the above-described method to obtain a light quantity reducing member.
  • the reduction rate of the peak illuminance at the light incident surface by 20 was measured.
  • As the illuminance meter 32 VEGA manufactured by OPHIR was used.
  • the PET film Toyobo Co., Ltd.
  • Example 2 The illumination device 10 was produced in the same manner as in Example 1 except that a reflective film (manufactured by 3M, ESR) having a thickness of 65 ⁇ m was used as the light quantity reducing member 20 instead of the white PET film.
  • ESR 3M, ESR
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 2%, and the peak illuminance reduction rate was 45%.
  • Example 3 18 g of polymethyl methacrylate (manufactured by Mitsubishi Rayon Co., Ltd., dialnal BR-85, weight average molecular weight 200,000 g / mol) was put into a mixed solution of 70 g of methylene chloride and 10.4 g of methanol, and stirred for 1 hour to dissolve. 2 g of titanium oxide having a particle size of 0.25 ⁇ m (CR-97, manufactured by Ishihara Kogyo Co., Ltd.) was added to the mixed solution in which the polymethyl methacrylate resin was dissolved, and the mixture was further stirred for 1 hour to obtain a coating solution.
  • polymethyl methacrylate manufactured by Mitsubishi Rayon Co., Ltd., dialnal BR-85, weight average molecular weight 200,000 g / mol
  • Example 1 Except 0.4 ml of this coating solution using a micropipette, dropped onto the center of the wavelength conversion sheet 16 and dried at 70 ° C. for 10 minutes to obtain the light quantity reducing member 20, the same as in Example 1.
  • a lighting device 10 was produced.
  • the light quantity reducing member 20 was circular with a thickness of 12 ⁇ m and a size of ⁇ 10 mm. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface was 3%.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 40%.
  • Example 4 A lighting device 10 was produced in the same manner as in Example 3 except that the amount of titanium oxide having a particle size of 0.25 ⁇ m (Ishihara Kogyo Co., Ltd., CR-97) was changed to 5 g.
  • the light quantity reducing member 20 was a circle having a thickness of 20 ⁇ m and a size of ⁇ 10 mm. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface was 3%.
  • the integrated absorption rate and the peak illuminance reduction rate were measured in the same manner as in Example 1. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 30%.
  • Example 2 A lighting device 10 was produced.
  • the light quantity reducing member 20 was circular with a thickness of 17 ⁇ m and a size of ⁇ 10 mm. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface was 3%.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 40%.
  • Example 6 Illumination is performed in the same manner as in Example 5 except that a rectangular frame is provided in the center of the wavelength conversion sheet 16, and the coating liquid is dropped into the frame to make the size of the light quantity reduction member 20 14 ⁇ 14 mm. Device 10 was made. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface is 8%.
  • the light quantity reducing member 20 uses the relationship between the coating thickness of the coating liquid (coating film thickness) and the thickness of the light quantity reducing member 20 to be formed, which has been obtained in advance through experiments, The thickness was adjusted to 17 ⁇ m by adjusting the (thickness). In the same manner as in Example 1, the integrated absorption rate and the peak light amount reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 45%.
  • Example 7 The lighting device 10 was produced in the same manner as in Example 6 except that the size of the light quantity reducing member 20 was 22.3 ⁇ 22.3 mm and the thickness was 17 ⁇ m. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface is 20%. In the same manner as in Example 1, the integrated absorption rate and the peak light amount reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 60%.
  • Example 8 As the light quantity reducing member 20, a brightness increasing film having a thickness of 155 ⁇ m (BEF2-T-155n, manufactured by 3M Co.) is used instead of the white PET film, and the size of the light quantity reducing member 20 is set to 7 ⁇ 7 mm.
  • the lighting device 10 was produced in the same manner as in Example 1. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface is 2%.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 40%.
  • Example 9 The illuminating device 10 was produced similarly to Example 1 except having changed the magnitude
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 60%.
  • Example 10 The lighting device 10 was produced in the same manner as in Example 1 except that the size of the light quantity reducing member 20 was changed to 35.4 ⁇ 35.4 mm. Therefore, the area ratio of the light quantity reduction layer with respect to the area of the light incident surface is 50%. In the same manner as in Example 1, the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 70%.
  • Example 11 Example, except that 0.4 parts by mass of bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate as a hindered amine compound was added to the quantum dot-containing polymerizable composition to be the wavelength conversion layer 26
  • the wavelength conversion sheet 16 was prepared in the same manner as in 1.
  • the lighting device 10 was produced in the same manner as in Example 1 except that this wavelength conversion sheet 16 was used and the light amount reducing member 20 was formed in the same manner as in Example 4.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 30%.
  • Example 12 ⁇ Preparation of Support Film 28-2 (Barrier Film with Light Scattering Layer)> A protective film (PAC2-30-T, manufactured by Sanei Kaken Co., Ltd.) is attached to the surface of the inorganic layer of the support film 28 previously prepared for protection, and then light scattering is performed on the PET film surface opposite to the inorganic layer by the following method. A layer was formed.
  • PAC2-30-T manufactured by Sanei Kaken Co., Ltd.
  • an acrylate compound (Viscat 700HV, manufactured by Osaka Organic Synthesis Co., Ltd.) and 40 g of an acrylate compound (manufactured by Taisei Fine Chemical Co., Ltd., 8BR500 (urethane (meth) acrylate)) were added and further stirred. Further, 1.5 g of a photopolymerization initiator (BASF, Irgacure (registered trademark) 819) and 0.5 g of a fluorosurfactant (3M, FC4430) were added to form a coating solution (polymerization for light scattering layer formation). Composition).
  • a photopolymerization initiator BASF, Irgacure (registered trademark) 819
  • a fluorosurfactant 3M, FC4430
  • the illumination device 10 was produced in the same manner as in Example 1 except that this wavelength conversion sheet 16-2 was used and the light amount reducing member 20 was formed in the same manner as in Example 4.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 30%.
  • Example 13 A lighting device 10 was produced in the same manner as in Example 11 except that the same wavelength conversion sheet 16-2 as in Example 12 was used except that one support film 28 was changed to the support film 28-2. In the same manner as in Example 1, the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 30%.
  • Example 14 A lighting device 10 was produced in the same manner as in Example 6 except that the same wavelength conversion sheet 16-2 as in Example 12 was used except that one support film 28 was changed to the support film 28-2. In the same manner as in Example 1, the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 45%.
  • Example 15 A lighting device 10 was produced in the same manner as in Example 7 except that the same wavelength conversion sheet 16-2 as in Example 12 was used except that one support film 28 was changed to the support film 28-2.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 60%.
  • Example 1 A lighting device was manufactured in the same manner as in Example 1 except that the light quantity reduction member 20 was not provided.
  • an acrylate compound (Viscoat 700 HV, manufactured by Osaka Organic Synthesis Co., Ltd.) and 40 g of an acrylate compound (manufactured by Osaka Fine Chemical Co., Ltd., 8BR500 (urethane (meth) acrylate)) were added and stirred for 1 hour. Further, 1.5 g of a photopolymerization initiator (BASF, Irgacure (registered trademark) 819) and 0.5 g of a fluorosurfactant (3M, FC4430) were added to the obtained liquid to obtain a coating solution. Produced.
  • a photopolymerization initiator BASF, Irgacure (registered trademark) 819
  • a fluorosurfactant (3M, FC4430
  • Example 1 An illumination device was produced in the same manner as in Example 1 except that the light quantity reducing member 20 was produced in this manner.
  • the light quantity reducing member was circular with a thickness of 16 ⁇ m and a size of ⁇ 13 mm. Therefore, the area ratio of the light quantity reduction layer with respect to the area of the light incident surface is 5%.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 1%, and the peak illuminance reduction rate was 5%.
  • Example 3 A lighting device was produced in the same manner as in Example 1 except that the size of the light quantity reducing member 20 was changed to 46 ⁇ 46 mm. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface is 85%. In the same manner as in Example 1, the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 0.5%, and the peak illuminance reduction rate was 90%.
  • Example 4 The lighting device is the same as in Example 1 except that the light quantity reducing member 20 is a white PET film and a copper film having a thickness of 40 ⁇ m and a size of 11 ⁇ 11 mm (manufactured by Arisawa Seisakusho, PNS H) is used. Produced. Therefore, the area ratio of the light quantity reducing member 20 with respect to the area of the light incident surface is 5%.
  • the integrated absorption rate and the peak illuminance reduction rate were measured. As a result, the integrated absorption rate was 10%, and the peak illuminance reduction rate was 30%.
  • the illuminating device 10 of the present invention has substantially the same brightness as that of the comparative example 1 that does not have the light quantity reducing member 20, and is excellent in durability.
  • the illumination device of Comparative Example 1 does not have the light amount reducing member 20
  • the illumination device of Comparative Example 2 has a reduction rate of peak illuminance by the light amount reducing member 20 that is too low.
  • the wavelength conversion sheet 16 wavelength conversion layer 26
  • the illumination device of Comparative Example 3 has a very low backlight luminance because the peak illuminance reduction rate by the light amount reducing member 20 is too high.
  • It can be suitably used as an illumination light source for various devices such as LCD backlights.
  • Wavelength conversion sheet 18 (Point) Light source 20, 20a Light quantity reduction member 26 Wavelength conversion layer 28 Support film 30 Base 32 Illuminance meter 32a Sensor 34 Light-shielding plate 34a Through-hole 46 Support member 48 Light guide plate 50 Light reflecting member S Virtual light incident surface

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Abstract

Le problème décrit par la présente invention est de concevoir un dispositif d'éclairage à durabilité élevée dans lequel est utilisée une feuille de conversion de longueur d'onde, le dispositif d'éclairage étant utilisé dans un dispositif d'affichage à cristaux liquides, ou analogue. La solution selon l'invention porte sur : un dispositif d'éclairage comportant une source de lumière ponctuelle, une feuille de conversion de longueur d'onde, et un élément de réduction de quantité de lumière disposé entre la source de lumière ponctuelle et une couche de conversion de longueur d'onde ; l'élément de réduction de quantité de lumière réduisant de 10 à 80 % la luminance de crête de la lumière émise par la source de lumière ponctuelle sur la surface d'incidence de lumière de la feuille de conversion de longueur d'onde, et fixant à une valeur inférieure ou égale à 5 % le taux d'absorption de lumière ayant une longueur d'onde de 450 nm mesuré à l'aide d'une sphère d'intégration.
PCT/JP2016/087770 2015-12-22 2016-12-19 Dispositif d'éclairage WO2017110737A1 (fr)

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JP2015250683 2015-12-22
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JP2016016095A JP6442423B2 (ja) 2015-12-22 2016-01-29 照明装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021015284A (ja) * 2020-10-15 2021-02-12 昭和電工マテリアルズ株式会社 波長変換部材、バックライトユニット、画像表示装置、波長変換用樹脂組成物及び波長変換用樹脂硬化物
JP2021027323A (ja) * 2019-08-02 2021-02-22 日亜化学工業株式会社 発光装置および面発光光源

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03208205A (ja) * 1990-01-11 1991-09-11 Shin Etsu Polymer Co Ltd 照明装置
JP2009140829A (ja) * 2007-12-07 2009-06-25 Sony Corp 照明装置及び表示装置
JP2011089121A (ja) * 2009-10-23 2011-05-06 Samsung Led Co Ltd 赤色蛍光体、赤色蛍光体の製造方法、発光素子パッケージ、面光源装置、照明装置及び車両用ヘッドライト

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03208205A (ja) * 1990-01-11 1991-09-11 Shin Etsu Polymer Co Ltd 照明装置
JP2009140829A (ja) * 2007-12-07 2009-06-25 Sony Corp 照明装置及び表示装置
JP2011089121A (ja) * 2009-10-23 2011-05-06 Samsung Led Co Ltd 赤色蛍光体、赤色蛍光体の製造方法、発光素子パッケージ、面光源装置、照明装置及び車両用ヘッドライト

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021027323A (ja) * 2019-08-02 2021-02-22 日亜化学工業株式会社 発光装置および面発光光源
JP2021015284A (ja) * 2020-10-15 2021-02-12 昭和電工マテリアルズ株式会社 波長変換部材、バックライトユニット、画像表示装置、波長変換用樹脂組成物及び波長変換用樹脂硬化物

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