CN102197323B - Light diffuser plate and use thereof - Google Patents
Light diffuser plate and use thereof Download PDFInfo
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- CN102197323B CN102197323B CN200980142533.0A CN200980142533A CN102197323B CN 102197323 B CN102197323 B CN 102197323B CN 200980142533 A CN200980142533 A CN 200980142533A CN 102197323 B CN102197323 B CN 102197323B
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- Prior art keywords
- light
- diffusing sheet
- transparent resin
- light diffusing
- particle
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
Abstract
Disclosed is a light diffuser plate (3) comprising a transparent resin and light-diffusing particles, wherein the transparent resin has a light transmittance of 65% or greater when light having a wavelength of 600 nm is transmitted through an optical path length of 200 mm. Preferably, the transparent resin has a zinc content of 150 ppm or less.
Description
Technical field
The present invention relates to can be with the light diffusing sheet of brighter and more natural tone illumination such as transmission type image display panel etc.
Background technology
As liquid crystal indicator, be for example well known that and dispose planar light source device as the liquid crystal indicator of the structure of backlight in the rear side with the liquid crystal panel of liquid crystal cells (image displaying part).As the planar light source device for described backlight, the known planar light source device (with reference to TOHKEMY 2004-170937 communique (patent documentation 1)) that disposes a plurality of light sources and dispose the structure of light diffusing sheet in the front face side of these light sources in lamp box (casing).
As above-mentioned light diffusing sheet, even if the light diffusing sheet picture dimension forming due to dispersed light diffusion particle in transparent resin greatly also can form the light diffusing sheet of comparison light weight, be therefore widely used.
Summary of the invention
But, known light diffusing sheet like this, the luminance shortage of irradiation transmission type image display panel etc. or the illumination obtaining are not that the situation of natural tone is more, in this case, in the transmission image display device of the liquid crystal indicator forming using this light diffusing sheet etc., produce the problem that shows the luminance shortage of image or be difficult to obtain the demonstration image of nature tone.
The present invention forms in view of above-mentioned technical background, and object is to provide the light diffusing sheet of transmission type image display panel etc. of can throwing light on more brightly.In addition, the present invention also aims to further to provide the light diffusing sheet with brighter and more natural tone illumination transmission type image display panel etc.
In order to reach above-mentioned purpose, the present inventor conducts in-depth research, the light transmittance that found that the light of wavelength 600nm impacts the brightness of illumination, the zinc compound that further discovery is added in the manufacture process of resin etc. impacts the tone of illumination, thereby has completed the present invention.That is, the invention provides following scheme.
[1] light diffusing sheet, this light diffusing sheet comprises transparent resin and light diffusion particle, and during the optical path length of the light transmission 200mm of wavelength 600nm, the light transmittance of described transparent resin is more than 65%.
[2] according to the light diffusing sheet described in preceding paragraph 1, wherein, described transparent resin is the composition that contains zinc compound, and the containing ratio of the zinc in said composition is below 150ppm.
[3], according to the light diffusing sheet described in preceding paragraph 2, wherein, described zinc compound is zinc stearate.
[4], according to the light diffusing sheet described in any one in preceding paragraph 1～3, wherein, described transparent resin contains polystyrene.
[5], according to the light diffusing sheet described in any one in preceding paragraph 1～4, wherein, described smooth diffusion particle is the a kind of above polymer particle being selected from acrylic acid series polymeric compounds particle and siloxane-based polymers particle.
[6] according to the light diffusing sheet described in any one in preceding paragraph 1～5, wherein, the mean grain size of described smooth diffusion particle is 0.5～5 μ m, the absolute value of the refractive index of described transparent resin and the specific refractivity of described smooth diffusion particle is more than 0.05, and the content of the described smooth diffusion particle described in every 100 mass parts in transparent resin is 0.1～10 mass parts.
[7] planar light source device, is characterized in that, possesses the light diffusing sheet described in any one and a plurality of light sources that are configured in the rear side of this light diffusing sheet in preceding paragraph 1～6.
[8] transmission image display device, is characterized in that, possess the light diffusing sheet described in any one in preceding paragraph 1～6, be configured in this light diffusing sheet rear side a plurality of light sources and be configured in the transmission type image display panel of the front face side of described light diffusing sheet.
In the invention of [1], comprise transparent resin and light diffusion particle, during the optical path length of the light transmission 200mm of wavelength 600nm, the light transmittance of described transparent resin is more than 65%, therefore, transmission type image display panel etc. more brightly can throw light on.
In the invention of [2], although described transparent resin is the composition that contains zinc compound, the containing ratio of the zinc in said composition is set at below 150ppm, therefore can be with more natural tone illumination transmission type image display panel.Should illustrate, " ppm " means the unit of quality PPM.
In the invention of [3], described zinc compound is zinc stearate, the mouldability in the time of therefore can improving processing and forming by the lubrication based on zinc stearate lubricant, and can be with more natural tone illumination.
In the invention of [4], described transparent resin is the structure that contains polystyrene, can be with the transparency high and more natural tone throw light on.
In the invention of [5], as described smooth diffusion particle, used the a kind of above polymer particle being selected from acrylic acid series polymeric compounds particle and siloxane-based polymers particle, therefore can throw light on brighter and natural tone.
In the invention of [6], the mean grain size of described smooth diffusion particle is 0.5～5 μ m, the absolute value of the refractive index of described transparent resin and the specific refractivity of described smooth diffusion particle is more than 0.05, the content of the described smooth diffusion particle described in every 100 mass parts in transparent resin is 0.1～10 mass parts, therefore has advantages of and can make light diffusion particle evenly spread fully and with less light diffusion particle use amount, light fully be spread.
In the invention of [7], can provide the planar light source device that can throw light on more brightly.In addition, when light diffusing sheet possesses the structure of [2], can provide the planar light source device that can carry out the illumination of brighter and more natural tone.
In the invention of [8], can provide the transmission image display device that can access brighter demonstration image.In addition, when light diffusing sheet possesses the structure of [2], can provide the transmission image display device of the demonstration image that can access brighter and more natural tone.
Accompanying drawing explanation
Fig. 1 means the schematic diagram of an embodiment of transmission image display device of the present invention.
Fig. 2 means the cut-open view of an embodiment of light diffusing sheet of the present invention.
Fig. 3 means the cut-open view of other embodiment of light diffusing sheet of the present invention.
Fig. 4 is the key diagram of assay method of light transmittance of the light of the wavelength 600nm in optical path length 200mm.
Description of reference numerals
1: planar light source device
2: light source
3: light diffusing sheet
20: transmission type image display panel
30: transmission image display device (liquid crystal indicator)
Embodiment
The liquid crystal indicator of one embodiment of transmission image display device of the present invention (30) is shown in to Fig. 1.In Fig. 1, (30) are that liquid crystal indicator, (11) are that liquid crystal cells, (12), (13) are that polaroid, (1) are planar light source device (backlights).The both sides up and down of above-mentioned liquid crystal cells (11) dispose respectively polaroid (12), (13), utilize these component parts (11), (12), (13) to form as the liquid crystal panel of transmission type image display part (20).
Should illustrate, above-mentioned liquid crystal cells (11) is by enclosing and have the device of liquid-crystal compounds to form between a pair of transparency electrode.As above-mentioned liquid crystal panel (20), preferably use have color filter etc. can color display device.In addition, above-mentioned liquid crystal panel (20) can also be to have for adjusting the structure of the polarizer of contrast while seeing from tilted direction, tone etc.
Above-mentioned planar light source device (1) is configured in the side (rear side) below of polaroid (13) of the downside of above-mentioned liquid crystal panel (20).That is, this liquid crystal indicator (30) is full run-down type liquid crystal display (video picture) device.
Above-mentioned planar light source device (1) have the open thin box shape of the upper face side (front face side) overlooked as rectangle lamp box (5), in this lamp box (5), be separated from each other a plurality of linear light sources (2) of configuration and be configured in the light diffusing sheet (3) of the upper side (front face side) of these a plurality of linear light sources (2).Above-mentioned light diffusing sheet (3) loads and fixes to stop up the mode of its open surface with respect to above-mentioned lamp box (5).In addition, the inner face of above-mentioned lamp box (5) is provided with reflection layer (not diagram).
As above-mentioned light source (2), there is no special restriction, such as except the linear light sources such as cold-cathode tube (CCFL), external electrode fluorescent (EEFL), plane fluorescent pipe (FFL), can also use the point source of lights such as light emitting diode (LED) etc.
Above-mentioned light diffusing sheet (3) comprises transparent resin and light diffusing sheet, is dispersed with light diffusion particle in transparent resin.In the present invention, as above-mentioned transparent resin, the light transmittance during optical path length of the light transmission 200mm of use wavelength 600nm is more than 65% transparent resin.
Thus, utilize above-mentioned planar light source device (1) liquid crystal panel (20) that can throw light on more brightly.Thereby, utilize above-mentioned liquid crystal indicator (30) can bring into play the effect that obtains brighter demonstration image.
In addition, in the present embodiment, above-mentioned transparent resin is the composition that contains zinc compound, and the containing ratio of the zinc in said composition (Zn atom) is set in below 150ppm.
Thus, utilize the above-mentioned planar light source device (1) can be with more natural tone illumination liquid crystal panel (20).Thereby, utilize above-mentioned liquid crystal indicator (30) can bring into play the effect of the demonstration image that obtains more natural tone.
Should illustrate, in above-mentioned liquid crystal indicator (30), between above-mentioned light diffusing sheet (3) and above-mentioned liquid crystal panel (20), can configure other light diffusing sheet.In addition, between above-mentioned light diffusing sheet (3) and above-mentioned liquid crystal panel (20), can also be configured for the optics that front face side is thrown light on brightly.As above-mentioned optics, can enumerate such as Minnesota Mining and Manufacturing Company's system " DBEF " (trade name) etc.
As above-mentioned transparent resin, be applicable to using the transparent resin of non-coloring.As above-mentioned transparent resin, there is no particular limitation, but can enumerate such as polystyrene, copolymer of methyl methacrylatestyrene, methacrylic acid-styrol copolymer, maleic anhydride-styrene copolymers, polymethylmethacrylate, methyl methacrylate-acrylate copolymer, polycarbonate, polypropylene, poly-cycloolefin, cycloolefin-alpha olefin copolymer etc.In these, few from the viewpoint of hydroscopicity, be applicable to using polystyrene, polypropylene, poly-cycloolefin and cycloolefin-alpha olefin copolymer.
In addition, as above-mentioned transparent resin, the light transmittance during optical path length of the light transmission 200mm of use wavelength 600nm is more than 65% transparent resin.Can more improve the illumination based on transmitted light thus.Wherein, as above-mentioned transparent resin, the light transmittance while preferably using the optical path length of light transmission 200mm of wavelength 600nm is more than 70% transparent resin.
Also think when starting monomer being adopted in liquid phase the methods such as suspension polymerization, dispersion copolymerization method carry out polymerization to manufacture transparent resin, the catalyst component adding in residual solvent, this solvent in the transparent resin obtaining, adjuvant etc. bring impact as impurity to the light transmittance of the light of wavelength 600nm.Or also think, the transparent resin obtaining is usingd to a small amount of adjuvant adding of various objects etc. as impurity, to the light transmittance of the light of wavelength 600nm, bring impact in polymerization.Therefore, " light transmittance during optical path length of the light transmission 200mm of wavelength 600nm is more than 65% transparent resin " of in the present invention, using can obtain by the following transparent resin of choice for use: the transparent resin cleaning fully after the transparent resin that the use amount of the catalyzer using, adjuvant etc. is few, polymerization, the transparent resin obtaining in polymerization is not added to the transparent resin of adjuvant etc. in manufacturing process, the transparent resin that additive capacity that the transparent resin obtaining in polymerization is added is few etc.
In addition, as above-mentioned transparent resin, so long as the composition that contains zinc compound, now the containing ratio of the zinc in above-mentioned composition (being the containing ratio of Zn atom, is not the containing ratio of zinc compound) preferably sets below 150ppm.If the containing ratio of zinc below 150ppm, can suppress to think the containing ratio to the influential zinc of tone, therefore can be with more natural tone illumination transmission type image display panel (20).Wherein, the containing ratio of the zinc in above-mentioned composition is more preferably set in below 90ppm, further preferably sets below 50ppm, is particularly preferably set in below 10ppm.
As above-mentioned zinc compound, there is no special restriction, but can enumerate for example zinc stearate, zinc laurate, p-tert-butyl benzoic acid zinc, 1,2-hydroxystearic acid zinc, Zinc tetradecanoate etc.
Due to can the be improved effect of lubricity of above-mentioned zinc stearate, thus by containing this zinc stearate, contribute to reduce the metal covering of transparent resin and molding machine friction, prevent that resin from adhering to the metal covering of molding machine and improving release property.
The containing ratio of above-mentioned zinc is the value (also identical for the containing ratio of the zinc in embodiment) of trying to achieve as follows.That is, the composition that contains zinc compound is got in platinum ware, added sulfuric acid heating to make organic carbon, then the carbonide obtaining is calcined with 550 ℃ in electric furnace, in this ash content, add alkali fusion agent heating to melt.Then, the liquefacient obtaining is dissolved in nitric acid and water, and be adjusted into a constant volume as test liquid, with ICP-AES (the inductively coupled plasma apparatus for analyzing luminosity " iCAP6500 " of Thermo Fisher Scientific company system), measure the Zn (element) in this test liquid.
As above-mentioned smooth diffusion particle, so long as above-mentioned transparent resin is non-compatibility, shows the refractive index different from this transparent resin, has and can make the particle (comprising powder) of the function that the transmitted light of transmitted light diffuser plate (3) spreads be not particularly limited, can be for example the inorganic particulate consisting of inorganic material, can be also the organic filler consisting of organic material.As this light diffusion particle, can use with surface conditioning agents such as coupling agents and carry out surface-treated particle.
Inorganic material as forming above-mentioned inorganic particulate, is not particularly limited, but can enumerates such as silicon dioxide, calcium carbonate, barium sulphate, titanium dioxide, aluminium hydroxide, unorganic glass, mica, talcum, white carbon, magnesium oxide, zinc paste etc.
Organic material as forming above-mentioned organic filler, is not particularly limited, but can enumerates such as acrylic acid series polymeric compounds, siloxane-based polymers, styrenic etc.
In the middle of these, from the viewpoint of can further improving illumination because impurity is few and can making light diffusing sheet more light-weighted, preferably use organic filler, particularly suitable is acrylic acid series polymeric compounds particle, siloxane-based polymers particle.
As aforesaid propylene acid based polymer particle, can enumerate and for example take the polymkeric substance that acrylic acid series monofunctional monomer is major component, contain the particle of the polymkeric substance of acrylic acid series monofunctional monomer unit more than 50 quality %.Particle as the above-mentioned polymkeric substance that contains acrylic acid series monofunctional monomer unit more than 50 quality %, can be the particle that whole (the 100 quality %) of monomeric unit are the polymkeric substance of acrylic acid series monofunctional monomer unit, can also be acrylic acid series monofunctional monomer and can with the particle of the multipolymer of the monofunctional monomer of its copolymerization.
As aforesaid propylene, acid is monofunctional monomer, can enumerate such as acrylic acid, methacrylic acid, acrylate, methacrylate etc.As aforesaid propylene acid esters, be not particularly limited, such as enumerating methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-EHA, acrylic acid 2-hydroxy methacrylate etc.In addition, as above-mentioned methacrylate, be not particularly limited, can enumerate such as methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-Ethylhexyl Methacrylate, 2-hydroxyethyl methacrylate etc.These acrylic acid series monofunctional monomer unit may be used alone, or two or more kinds may be used in combination.
The monofunctional monomer that can be monofunctional monomer copolymerization with aforesaid propylene acid is in molecule, to have 1 can carry out two keys of free radical polymerization, the compound that also can carry out copolymerization with this pair of key and acrylic acid series monofunctional monomer.Specifically, can enumerate for example styrene, can also enumerate the halogenated styrenes classes such as chlorostyrene, bromostyrene, the substituted phenylethylenes such as ring-alkylated styrenes class such as vinyltoluene, α-methyl styrene etc.And then can also enumerate vinyl cyanide.These monofunctional monomers may be used alone, or two or more kinds may be used in combination.
In the situation of the particle of the polymkeric substance that whole (the 100 quality %) that the sour based copolymer particle of aforesaid propylene is monomeric unit are acrylic acid series monofunctional monomer unit, and be acrylic acid series monofunctional monomer and can with the situation of the particle of the multipolymer of the monofunctional monomer of its copolymerization under, preferably its weight-average molecular weight is 500,000～5,000,000.
In addition, as aforesaid propylene acid based polymer particle, can also be acrylic acid series monofunctional monomer and can with the particle of the multipolymer of the polyfunctional monomer of its copolymerization.Described polyfunctional monomer refer in molecule, have more than 2 can with two keys of acrylic acid series monofunctional monomer copolymerization, and the compound that can carry out copolymerization with these pair of key and acrylic acid series monofunctional monomer.As this polyfunctional monomer, can enumerate such as the methyl acrylic ester of identical polyalcohols with enumerating for above-mentioned styrenic particle, esters of acrylic acid of polyalcohols, aromatic series polyfunctional compound etc.These polyfunctional monomers may be used alone, or two or more kinds may be used in combination.
Acrylic acid series monofunctional monomer and can with the multipolymer of the polyfunctional monomer of its copolymerization multipolymer of cross-linked structure preferably, its gel fraction is more than 10 quality %.
In addition, as aforesaid propylene acid based polymer particle, can also be by acrylic acid series monofunctional monomer/can with the monofunctional monomer of its copolymerization/equally can copolymerization polyfunctional monomer carry out copolymerization and the particle of the ternary system multipolymer that obtains etc.
The refractive index of aforesaid propylene acid based copolymer particle is generally 1.46～1.55 left and right, has the larger tendency of the larger shown refractive index of containing ratio of benzene skeleton, halogen atom.In addition, this acrylic acid series copolymer particle can adopt general polymerizations such as suspension polymerization, microsuspension polymerization method, emulsion polymerization, dispersion copolymerization method to manufacture.
Above-mentioned siloxane-based polymers particle is the polymkeric substance of the method for the hydrolysis of chlorosilane class, condensation being manufactured by for example.As above-mentioned chlorosilane class, can enumerate such as dimethyldichlorosilane, diphenyl dichlorosilane, phenylmethyldichloroislane, methyl trichlorosilane, phenyl trichlorosilane etc.As above-mentioned siloxane-based polymers, it can be crosslinked state.For crosslinked, for example make siloxane-based polymers and benzoyl peroxide, peroxidating 2,4-dichloro-benzoyl, chloro benzoyl peroxide, cumyl peroxide, di-t-butyl peroxide-2,5-dimethyl-2, the peroxidations such as 5-bis-(t-butylperoxy) hexane.In addition, end has in the situation of structure of silanol group, carries out condensation cross-linking with alkoxyl silicone alkanes.Preferred each silicon atom of above-mentioned crosslinked siloxane-based polymers is in conjunction with the structure of the organic group of 2～3 left and right.This siloxane-based polymers is the polymkeric substance also referred to as organic silicon rubber, organic siliconresin.As siloxane-based polymers, preferably using under normal temperature is the siloxane-based polymers of solid.
Above-mentioned siloxane-based polymers particle for example can obtain by pulverizing above-mentioned siloxane-based polymers.Can also the form with granular particle obtain (with reference to Japanese kokai publication sho 59-68333 communique) by having that the curing type polymkeric substance of wire organosiloxane block or its composition solidify with atomize.In addition, can also be by alkyltrialkoxysilaneand or its partial hydrolysis condensation product being hydrolyzed in the aqueous solution of ammonium or amine to condensation and obtain (with reference to Japanese kokai publication sho 60-13813 communique) with the form of granular particle.
Above-mentioned siloxane-based polymers particle preferably its weight-average molecular weight is 500,000～5,000,000.In addition, in the situation that above-mentioned siloxane-based polymers is cross-linked structure, more than its gel fraction is preferably 10 quality %.The refractive index of above-mentioned siloxane-based polymers particle is generally 1.40～1.47 left and right.
As above-mentioned styrenic particle, can enumerate and for example take the polymkeric substance that polystyrene monofunctional monomer unit is major component, can enumerate the particle of the polymkeric substance of the polystyrene monofunctional monomer unit containing more than 50 quality %.Particle as the above-mentioned polymkeric substance that contains polystyrene monofunctional monomer unit more than 50 quality %, can be the particle that whole (the 100 quality %) of monomeric unit are the polymkeric substance of polystyrene monofunctional monomer unit, can be also polystyrene monofunctional monomer and can with the particle of the multipolymer of the monofunctional monomer of its copolymerization.
Above-mentioned polystyrene monofunctional monomer is to have styrene skeleton and in molecule, have 1 compound that can carry out two keys of free radical polymerization.Specifically, for example styrene can be enumerated, substituted phenylethylene etc. can also be enumerated.As above-mentioned substituted phenylethylene, can enumerate the class such as the halogenated styrenes such as chlorostyrene, bromostyrene, the ring-alkylated styrenes classes such as vinyltoluene, α-methyl styrene etc.
Can be in molecule, to there is 1 can carry out two keys of free radical polymerization, the compound that also can carry out copolymerization with this pair of key and polystyrene monofunctional monomer with the monofunctional monomer of above-mentioned polystyrene monofunctional monomer copolymerization.Specifically, can enumerate methyl acrylic esters such as methyl methacrylate, β-dimethyl-aminoethylmethacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-Ethylhexyl Methacrylate, 2-hydroxyethyl methacrylate, the esters of acrylic acids such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-EHA, acrylic acid 2-hydroxy methacrylate, vinyl cyanide etc.These monofunctional monomers may be used alone, or two or more kinds may be used in combination.Wherein, as can preferably using β-dimethyl-aminoethylmethacrylate class with the monofunctional monomer of above-mentioned polystyrene monofunctional monomer copolymerization.
Above-mentioned styrene based copolymer particle is in the situation of whole (the 100 quality %) of the monomeric unit particle that is the polymkeric substance of polystyrene monofunctional monomer unit, and be polystyrene monofunctional monomer and can with the situation of the particle of the multipolymer of the monofunctional monomer of its copolymerization under, its weight-average molecular weight preferably 500,000～5,000,000.
In addition, as above-mentioned styrene based copolymer particle, can also be polystyrene monofunctional monomer and can with the particle of the multipolymer of the polyfunctional monomer of its copolymerization.Described polyfunctional monomer refer in molecule, have more than 2 can free radical polymerization two keys, and the compound that can carry out copolymerization with this pair of key and polystyrene monofunctional monomer.As this polyfunctional monomer, can enumerate for example dimethacrylate 1, 4-butanediol ester, neopentyl glycol dimethacrylate, Ethylene glycol dimethacrylate, diethylene glycol dimethylacrylate, TEG dimethylacrylate, dimethyl allene acid propylene glycol ester, four propylene glycol dimethylacrylates, trimethylol-propane trimethacrylate, the methacrylate of the polyalcohols such as pentaerythritol tetramethacrylate, diacrylate 1, 4-butanediol ester, diacrylic acid pentyl diol ester, ethylene glycol diacrylate, diethylene glycol diacrylate, tetraethylene glycol diacrylate, diacrylate propylene glycol ester, four propylene glycol diacrylates, trimethylolpropane triacrylate, the acrylate of the polyalcohols such as pentaerythritol tetracrylate, divinylbenzene, the aromatic series polyfunctional compounds such as diallyl phthalate etc.Above-mentioned polyfunctional monomer may be used alone, or two or more kinds may be used in combination.
Polystyrene monofunctional monomer and can with the multipolymer of the polyfunctional monomer of its copolymerization multipolymer of cross-linked structure preferably, its gel fraction is more than 10 quality %.
In addition, as above-mentioned styrenic particle, can also be by polystyrene monofunctional monomer/can be with the monofunctional monomer of its copolymerization/can carry out copolymerization with the polyfunctional monomer of its copolymerization and the particle of ternary system multipolymer obtaining etc.
The refractive index of above-mentioned styrenic particle is generally 1.53～1.61 left and right, has the larger tendency of the larger shown refractive index of containing ratio of benzene skeleton, halogen atom.In addition, this styrenic particle can use general polymerizations such as suspension polymerization, microsuspension polymerization method, emulsion polymerization, dispersion copolymerization method to manufacture.
From can make light diffusion and can transparent resin, disperse sufficiently uniformly aspect consider, the mean grain size of above-mentioned smooth diffusion particle is preferably 0.5 μ m～5 μ m, preferred scope is 0.6 μ m～3 μ m.
Should illustrate, the mean grain size of above-mentioned smooth diffusion particle is to be determined as follows and the value (mean grain size of the light diffusion particle of embodiment is also identical) that obtains.That is, first, at sample bench crimping fixed light diffusant (light diffusion particle) and carry out carbon evaporation and make coupons.Use the electrolysis radial pattern scanning electron microscope " FE-SEM S-4200 " of Hitachi's system this coupons to be carried out to observation and the photography of the SEM picture of light diffusing agent with the enlargement factor of 10000 times～20000 times.In the photographs of the light diffusion particle obtaining, (at random) selects 40 light diffusion particles arbitrarily, from image, by 3, determines the particle diameter that circule method is measured respectively these 40 light diffusion particles.Using the mean value of the particle diameter of 40 light diffusion particles obtaining like this as " mean grain size ".That is, be that each particle diameter of these 40 light diffusion particles is added up to, the value that this aggregate value is obtained divided by 40.
In addition, even be that fewer use amount also can make light fully spread from the viewpoint of the use amount of light diffusion particle, the absolute value of the refractive index of above-mentioned transparent resin and the specific refractivity of above-mentioned smooth diffusion particle preferably reaches more than 0.05, wherein the absolute value of above-mentioned specific refractivity is more preferably more than 0.10, in addition, the absolute value of common above-mentioned specific refractivity is set as below 0.50.
The use amount of above-mentioned smooth diffusion particle is according to the size of the refractive index of above-mentioned transparent resin and the absolute value of the specific refractivity of above-mentioned smooth diffusion particle, as the diffusion of the light of target and different, but with respect to transparent resin 100 mass parts, be generally 0.01～20 mass parts, be preferably 0.1～10 mass parts.
In not hindering the scope of effect of the present invention, light diffusing sheet of the present invention (3) can also contain the adjuvants such as antistatic agent, antioxidant, processing stabilizers, ultraviolet light absorber, fire retardant.These adjuvants can be used alone or in combination of two or more kinds respectively.
In the embodiment of Fig. 2, light diffusing sheet (3) has adopted the structure consisting of individual layer, but also can adopt the structure consisting of 2 layers of above multilayer.
For example, as shown in Figure 3, as above-mentioned light diffusing sheet (3), also can adopt two-sided laminate surface layer (9), (9) integrated structure in basic unit's (bottom) (8).Above-mentioned basic unit (8) comprises transparent resin and light diffusion particle, is that the light transmittance while having used the optical path length of light transmission 200mm of wavelength 600nm as above-mentioned transparent resin is the layer of more than 65% transparent resin.Can also adopt one side laminate surface layer (9) integrated structure in above-mentioned basic unit (8).
As the transparent resin that forms above-mentioned superficial layer (9), use the transparent resin that for example shows compatibility with respect to the transparent resin that forms above-mentioned basic unit (8), as this transparent resin, be not particularly limited, but can enumerate such as polystyrene, copolymer of methyl methacrylatestyrene, methacrylic acid-styrol copolymer, maleic anhydride-styrene copolymers, polymethylmethacrylate, methyl methacrylate-acrylate copolymer, polycarbonate, polypropylene, poly-cycloolefin, cycloolefin-alpha olefin copolymer etc.As the transparent resin that forms above-mentioned superficial layer (9), light transmittance in the time of can being the optical path length of light transmission 200mm of wavelength 600nm is more than 65% transparent resin, or, for example the thickness (T) of superficial layer (9) is compared in thin situation with basic unit (8), the transparent resin that the light transmittance in the time of can being the optical path length of light transmission 200mm of wavelength 600nm is less than 65%.
In the situation that contains ultraviolet light absorber in above-mentioned superficial layer (9), as this ultraviolet light absorber, there is no particular restriction, but can enumerate such as benzotriazole, is that ultraviolet light absorber, benzophenone series ultraviolet light absorber, cyanoacrylate are that ultraviolet light absorber, malonate are that ultraviolet light absorber, oxanilide are ultraviolet light absorber etc.By contain ultraviolet light absorber in above-mentioned superficial layer (9), can prevent light diffusing sheet (3) by ultraviolet ray of containing in the light from exterior light and light source (2) etc. and deteriorated.
In above-mentioned superficial layer (9), except above-mentioned ultraviolet light absorber, can also contain adjuvants such as coarse agent (マ Star トization drug), light diffusing agent (light diffusion particle), antistatic agent, antioxidant, processing stabilizers, fire retardant, lubricant.
The thickness (T) of above-mentioned superficial layer (9) is generally 10 μ m～200 μ m, more preferably 20 μ m～200 μ m, particularly preferably 50 μ m～100 μ m (with reference to Fig. 3).
In addition, the thickness (S) of above-mentioned light diffusing sheet (3) is set as 1mm above (with reference to Fig. 2,3) conventionally.More than reaching 1mm, can guarantee fully physical strength.In addition, in order to ensure the light weight of light diffusing sheet (3), the thickness (S) of above-mentioned light diffusing sheet (3) is preferably set to below 5mm.
Light diffusing sheet of the present invention (3) in the situation that the such single layer structure of Fig. 2 can manufacture by methods such as extrusion moulding, injection moulding.For example transparent resin and light diffusion resin is dry mixed and is closed, by heating, make molten condition, by common methods of forming such as extrusion moulding, injection mouldings, carry out moulding.Also can make after the granular masterbatch that light diffusion particle is obtained with melting mixing together with more a small amount of transparent resin in advance, by transparent resin and the dry type that mixes of this masterbatch.In addition, in the situation of the sandwich construction shown in Fig. 3, can manufacture by methods such as co-extrusion modling method, laminating method, heat viscosity method, solvent bonding, polymeric adhesive method, casting polymerization, surface-coated methods.These manufacture methods only represent its example, and light diffusing sheet of the present invention (3) is not limited to the product of being manufactured by such manufacture method.
In addition, light diffusing sheet of the present invention (3) can have antistatic agent at its surface-coated.By having antistatic agent at surface-coated like this, can prevent adhering to of dust of being caused by static etc., can prevent that dust from adhering to the reduction of the light transmittance causing, transmission type image display panel (liquid crystal panel etc.) (20) brightly therefore can throw light on to longer-term.
Should illustrate, the size of light diffusing sheet of the present invention (3) there is no special restriction, can according to for example as the planar light source device (1) of target, the size of transmission image display device (30) suitably set, wherein, be particularly suitable for being designed to the light diffusing sheet of the above size of 20 types (vertical 30cm, horizontal 40cm).
Light diffusing sheet of the present invention (3), planar light source device (1) and transmission image display device (30) are without particular limitation of in above-mentioned embodiment, within the scope of claim, only otherwise depart from its spirit, allow the change designing arbitrarily.
Embodiment
Then, specific embodiments of the invention are described, the present invention is without particular limitation of in these embodiment.
First, Details as Follows for the 1st extruder using, the 2nd extruder and T-shaped mould.
The 1st extruder: spiral shell footpath 40mm, single axle, band vent port, TANABE PLASTICS company system
The 2nd extruder: spiral shell footpath 40mm, single axle, band vent port, TANABE PLASTICS company system
T-shaped mould: the 2 kinds 3 layers T-shaped mould of branch manifold, the wide 250mm of lip, MITAKA ENGINEERING company system
< starting material >
(light diffusing agent masterbatch)
After polystyrene (Japan styrene company system " HRM40 ") 84 mass parts, light diffusion particle (Roam and Haas company system " PARALOID EXL 5766 ", cross-linked acrylic acid based polymer particle) 14 mass parts, ultraviolet light absorber (common drug company system " Viosorb 520 ") 1 mass parts, processing stabilizers (sumitomo chemical company system " SUMILIZER GP ") 1 mass parts are dry mixed and are closed; the biaxial extruder that uses spiral shell footpath 65mm carries out mixing at 80～250 ℃ and granulating has obtained granular light diffusing agent masterbatch.
(superficial layer potpourri)
By copolymer of methyl methacrylatestyrene (chemical company of Nippon Steel system (MS200NT)) 90.9 mass parts, coarse agent (sumitomo chemical company system " XC1A "; cross-linked acrylic acid based polymer particle; mean grain size 25 μ m) after 8 mass parts, ultraviolet light absorber (ADEKA company system " ADK STAB LA-31 ") 1 mass parts, processing stabilizers (sumitomo chemical company system " SUMILIZER GP ") 0.1 mass parts are dry mixed and close; the biaxial extruder that uses spiral shell footpath 65mm carries out mixing at 180～250 ℃ and granulating has obtained granular superficial layer potpourri.
< embodiment 1>
Dow Chemical's system " STYRON 648 " is processed by manufacturing plant, thereby polystyrene (zinc take the form of zinc stearate contain) is adjusted into zinc containing ratio below 10ppm, described polystyrene is put into the metal die of 260mm * 110mm * thick 5mm, use thermal pressure machine (refreshing island metal industry made " Shindo formula ASF type hydraulic press "), with 230 ℃ of forming temperatures, carrying out the moulding of thermal pressure machine (carries out 5 minutes with 0.3MPa, with 2.0MPa, carry out 3 minutes, with 13.0MPa, carry out 1 minute, cooling 5 minutes) after, by cutting, obtained the transparent resin plate (with reference to Fig. 4) of wide 50mm * long 200mm * thick 5mm.This transparent resin plate is obtained to T by assay method described later
600, T
400, Tt (light splitting), colourity x, chromaticity y, colour difference.
Then, by above-mentioned light diffusing agent masterbatch 7.5 mass parts and above-mentioned zinc containing ratio, be in the material box of polystyrene (Dow Chemical's system " STYRON 648 ") 100 mass parts input the 1st extruders below 10ppm, the vacuum keep of exhaust portion is carried out to melting mixing with 200～250 ℃ under the state of 100kpa (gauge pressure), be supplied to the T-shaped mould that remains on 245～250 ℃.
On the other hand, above-mentioned superficial layer is dropped in the material box of the 2nd extruder with potpourri, the vacuum keep of exhaust portion is carried out to melting mixing with 190～250 ℃ under the state of 100kpa (gauge pressure), be supplied to the T-shaped mould that remains on 245～250 ℃.
In the mode that the resin combination of being supplied with by above-mentioned the 1st extruder becomes basic unit (8), the resin combination supplied with by above-mentioned the 2nd extruder becomes superficial layer (9) (9), carry out co-extrusion modling, the light diffusing sheet 3 that the plywood by 3-tier architecture of the thickness 2.0mm shown in construction drawing 3 (1.9mm of basic unit, superficial layer 0.05mm * 2) forms.
< embodiment 2>
Dow Chemical's system " STYRON 648 " is processed by manufacturing plant, thereby polystyrene (zinc take the form of zinc stearate contain) is adjusted into zinc containing ratio as 100ppm, the polystyrene that replaces zinc containing ratio to be adjusted into below 10ppm using this polystyrene as transparent resin is used, in addition, carry out similarly to Example 1, obtain the transparent resin plate of wide 50mm * long 200mm * thick 5mm, and made the light diffusing sheet that the plywood by 3-tier architecture forms.
Embodiment 3
BASF AG's system " 168N " is processed by manufacturing plant, thereby polystyrene (zinc take the form of zinc stearate contain) is adjusted into zinc containing ratio as 50ppm, the polystyrene that replaces zinc containing ratio to be adjusted into below 10ppm using this polystyrene as transparent resin is used, in addition, carry out similarly to Example 1, obtain the transparent resin plate of wide 50mm * long 200mm * thick 5mm, and made the light diffusing sheet that the plywood by 3-tier architecture forms.
Comparative example 1
INEOSNOVA Chemicals company system " Empera 350N " is processed by manufacturing plant, thereby it is 70ppm that polystyrene is adjusted into zinc containing ratio, the polystyrene that replaces zinc containing ratio to be adjusted into below 10ppm using this polystyrene as transparent resin is used, in addition, carry out similarly to Example 1, obtain the transparent resin plate of wide 50mm * long 200mm * thick 5mm, and made the light diffusing sheet that the plywood by 3-tier architecture forms.
Table 1
By following assay method, each transparent resin plate obtaining is as mentioned above obtained to T
600, T
400, Tt (light splitting), colourity x, chromaticity y, colour difference.In addition, each light diffusing sheet obtaining is as described above obtained to light transmittance (Tt) and mean luminance differences by following evaluation method.These be the results are shown in to table 1.
The assay method of light transmittance of the assay method of the light transmittance of the light of the wavelength 600nm in < optical path length 200m, the light of the wavelength 400nm in optical path length 200mm is, the assay method > of the light transmittance of transparent resin plate (Tt)
4 sides (51) of grinding resulting transparent resin plate (wide 50mm * long 200mm * thick 5mm) with muller (ASAHI MEGARO company system " Pla Beauty 1000 ") make determination test sheet (50) (with reference to Fig. 4).Light transmittance (T while using Hitachi's plastic properties processed to measure system (being formed by U-4000 type spectrophotometer and large-scale sample chamber integrating sphere auxiliary equipment) to the optical path length of the light transmission 200mm of this mensuration coupons mensuration wavelength 600nm
600).Light transmittance (T while in addition, measuring equally the optical path length of light transmission 200mm of wavelength 400nm
400).In addition, measure equally the light transmittance Tt (arithmetic mean of the light transmittance of the light of wavelength 380～780nm) in the optical path length of 200mm.
The assay method of < colourity x and chromaticity y, the computing method > of colour difference
Use Hitachi's plastic properties processed to measure system (being formed by U-4000 type spectrophotometer and large-scale sample chamber integrating sphere auxiliary equipment) and said determination coupons is measured to colourity x and the chromaticity y of transmitted light.Spectrophotometric Illuminant chromaticity x=0.3100, y=0.3161, by the colour difference { (Δ x) of this " Illuminant chromaticity " and " colourity of transmitted light "
2+ (Δ y)
2}
1/2evaluate the colourity (whether being natural tone) of this transparent resin.That is, this colour difference is less, more the light from light source forwards can be thrown light on more natural tone.
< mouldability is evaluated >
When making transparent resin plate by the moulding of thermal pressure machine, by to the metal covering of thermal pressure machine, do not have resin to adhere to and release property also good situation be made as " zero ", by the metal covering of thermal pressure machine, have resin to adhere to and release property also poor situation be made as " * ".
The assay method > of the light transmittance of < light diffusing sheet (Tt)
To the light diffusing sheet obtaining, use the Transflective rate meter HR-100 type of color technical institute system in village to take JIS K7136 as benchmark mensuration light transmittance (Tt).
The evaluation method > of < mean luminance differences (with the luminance difference of comparative example 1)
The light diffusing sheet obtaining as mentioned above be take and extruded the mode that direction (MD direction) is horizontal 110mm as vertical 110mm, perpendicular direction and be cut into square, obtain evaluation test sheet.Then, from liquid crystal TV set dismounting liquid crystal panel, various blooming and the light diffusing sheet of 20 inches of commercially available types, the central portion of this light diffusing sheet is dug out to the square of 110mm * 110mm, at this, dig out the evaluation test sheet that part is installed above-mentioned light diffusing sheet (embodiment product, comparative example product), by its with above-mentioned dismounting after the state configuration of butt above of frame portion of lamp box (inside has many fluorescent tubes to be separated from each other configuration) fix and stop up the open surface of lamp box.Then, the overlapping 2 commercially available optical diffusion films of leading flank at this light diffusing sheet, and then its front face side and 1 brightness raising film (Minnesota Mining and Manufacturing Company's system " DBEF ") are overlapped, under the state of lighting at fluorescent tube, with brightness measuring meter (ISYSTEM of Co., Ltd. system " Eye Scale-3W ", multiple spot nitometer), measure its brightness.
Should illustrate, above-mentioned brightness measuring carries out as follows.; on ground in the darkroom of constant temperature and humidity (25.0 ℃ of temperature, humidity 50.0%) by liquid crystal TV set with its front face side towards above the mode of (making the back side and ground butt) configure, in the mode of whole that can photograph before liquid crystal TV set, in the top position of liquid crystal TV set, configure camera down.Now, from the distance to camera before liquid crystal TV set, be 120.0cm, the condition determination of brightness measuring meter is set as to SPEED:1/250, GAIN:3, aperture: 16, four corner before liquid crystal TV set is appointed as to measuring point, measure respectively the brightness in each measuring point (51 * 51=2601 place), using the mean value of these brightness as mean flow rate (cd/m
2).
Mean luminance differences (%)={ (mean flow rate of embodiment)-(mean flow rate of comparative example 1) }/(mean flow rate of comparative example 1)
With the mean luminance differences (%) of obtaining by above-mentioned calculating formula, evaluate.
As shown in Table 1, with regard to the light diffusing sheet of embodiments of the invention 1～3, the T of transparent resin
600be more than 65%, than the T of transparent resin
600the mean flow rate of light diffusing sheet that is 30.9% comparative example 1 is high, therefore, can throw light on more brightly such as transmission type image display panel etc.
And then the containing ratio of the zinc in the transparent resin of the light diffusing sheet of embodiment 1～3 (polystyrene) is below 150ppm, so colour difference is little, can be with more natural tone illumination such as transmission type image display panel etc.Wherein, the embodiment 1 of the containing ratio of the zinc in transparent resin below 50ppm and 3 light diffusing sheet be because colour difference is especially little, so can be with more natural tone illumination transmission type image display panel etc.
In industry, utilize possibility
The light diffusing sheet that light diffusing sheet of the present invention is suitable as for planar light source device is used, but is not defined in especially such purposes.In addition, the backlight that planar light source device of the present invention is suitable as for transmission image display device is used, but is not defined in especially such purposes.
Claims (7)
1. a light diffusing sheet, it is characterized in that, comprise transparent resin and light diffusion particle, during the optical path length of the light transmission 200mm of wavelength 600nm, the light transmittance of described transparent resin is more than 65%, described transparent resin is the composition that contains zinc compound, and the containing ratio of the zinc in said composition is below 10ppm.
2. light diffusing sheet according to claim 1, wherein, described zinc compound is zinc stearate.
3. light diffusing sheet according to claim 1 and 2, wherein, described transparent resin contains polystyrene.
4. light diffusing sheet according to claim 1 and 2, wherein, described smooth diffusion particle is the a kind of above polymer particle being selected from acrylic acid series polymeric compounds particle and siloxane-based polymers particle.
5. light diffusing sheet according to claim 1 and 2, wherein, the mean grain size of described smooth diffusion particle is 0.5～5 μ m, the absolute value of the refractive index of described transparent resin and the specific refractivity of described smooth diffusion particle is more than 0.05, and the content of the described smooth diffusion particle described in every 100 mass parts in transparent resin is 0.1～10 mass parts.
6. a planar light source device, is characterized in that, possesses the light diffusing sheet described in any one and a plurality of light sources that are configured in the rear side of this light diffusing sheet in claim 1～5.
7. a transmission image display device, it is characterized in that, possess the light diffusing sheet described in any one in claim 1～5, be configured in this light diffusing sheet rear side a plurality of light sources and be configured in the transmission type image display panel of the front face side of described light diffusing sheet.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008285202 | 2008-11-06 | ||
| JP2008-285202 | 2008-11-06 | ||
| PCT/JP2009/069227 WO2010053204A1 (en) | 2008-11-06 | 2009-11-05 | Light diffuser plate and use thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102197323A CN102197323A (en) | 2011-09-21 |
| CN102197323B true CN102197323B (en) | 2014-07-16 |
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|---|---|---|---|
| CN200980142533.0A Expired - Fee Related CN102197323B (en) | 2008-11-06 | 2009-11-05 | Light diffuser plate and use thereof |
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|---|---|
| JP (1) | JP5164959B2 (en) |
| KR (1) | KR20110084287A (en) |
| CN (1) | CN102197323B (en) |
| TW (1) | TWI434074B (en) |
| WO (1) | WO2010053204A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012188504A (en) * | 2011-03-09 | 2012-10-04 | Sumitomo Chemical Co Ltd | Resin composition for light guide plate, and light guide plate |
| WO2013129290A1 (en) * | 2012-03-02 | 2013-09-06 | 三菱製紙株式会社 | Transmissive type screen |
| JP5921920B2 (en) * | 2012-03-15 | 2016-05-24 | 第一工業製薬株式会社 | Resist resin composition for laser processing |
| CN103412354B (en) * | 2013-08-07 | 2015-12-23 | 东莞市鑫聚光电科技有限公司 | A kind of production method of light-duty light diffusing sheet |
| KR20150081963A (en) | 2014-01-07 | 2015-07-15 | 바이엘머티리얼사이언스 주식회사 | Light diffusion plate |
| CN103910945B (en) * | 2014-03-28 | 2016-08-31 | 东莞市鑫聚光电科技有限公司 | It is used in the diffuser plate production technology of straight-down negative display backlight source and LED flat lamp |
| CN104829960A (en) * | 2015-05-08 | 2015-08-12 | 东莞市颖锋光电材料有限公司 | Fabrication method of optical diffusion plate |
| CN112280202A (en) * | 2019-07-23 | 2021-01-29 | 惠州市笨鸟先飞光学材料有限公司 | PS flame-retardant optical diffusion plate |
| JPWO2021132001A1 (en) | 2019-12-24 | 2021-07-01 | ||
| CN114933794B (en) * | 2022-06-20 | 2023-11-03 | 深圳市康显科技有限公司 | High-permeability high-fog type light diffusion sheet and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3700729B2 (en) * | 1995-05-31 | 2005-09-28 | 日本ゼオン株式会社 | Light diffusing resin composition and light diffusion molded product |
| JP2005010813A (en) * | 2004-09-28 | 2005-01-13 | Mitsui Chemicals Inc | Light diffusion plate |
| JP4857286B2 (en) * | 2005-01-25 | 2012-01-18 | コーロン インダストリーズ インク | Light diffusion plate |
| JP2007333901A (en) * | 2006-06-13 | 2007-12-27 | Asahi Kasei Corp | Optical film |
| JP4976816B2 (en) * | 2006-11-06 | 2012-07-18 | 住友化学株式会社 | Liquid crystal display |
| JP2008233835A (en) * | 2007-02-22 | 2008-10-02 | Omron Corp | Diffusion sheet and directly beaneth backlight using the same |
| JP2008216879A (en) * | 2007-03-07 | 2008-09-18 | Sumitomo Chemical Co Ltd | White surface light source device and liquid crystal display device |
-
2009
- 2009-11-05 CN CN200980142533.0A patent/CN102197323B/en not_active Expired - Fee Related
- 2009-11-05 TW TW98137605A patent/TWI434074B/en not_active IP Right Cessation
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Non-Patent Citations (3)
| Title |
|---|
| JP特开2005-10813A 2005.01.13 |
| JP特开2008-233835A 2008.10.02 |
| JP特开平8-327806A 1996.12.13 |
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| TWI434074B (en) | 2014-04-11 |
| JP5164959B2 (en) | 2013-03-21 |
| JP2010134461A (en) | 2010-06-17 |
| WO2010053204A1 (en) | 2010-05-14 |
| KR20110084287A (en) | 2011-07-21 |
| TW201033644A (en) | 2010-09-16 |
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