CN102736134A - Optical film, optical diaphragm and liquid display module - Google Patents
Optical film, optical diaphragm and liquid display module Download PDFInfo
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- CN102736134A CN102736134A CN2012101055074A CN201210105507A CN102736134A CN 102736134 A CN102736134 A CN 102736134A CN 2012101055074 A CN2012101055074 A CN 2012101055074A CN 201210105507 A CN201210105507 A CN 201210105507A CN 102736134 A CN102736134 A CN 102736134A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L45/00—Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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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
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Abstract
The present invention aims to providing an optical film, an optical diaphragm and a liquid display module, which are small in phase difference change caused by an external force and excellent in optical uniformity, and can by used for displaying a subtle image, wherein the optical film comprises a cycloolefin copolymer as a main component, the photoelastic coefficient of the optical film is preferably lower than 10*10-12/Pa, the average thickness of the optical film is preferably higher than 10 microns and lower than 500 microns, the absolute value of the phase difference value (Re) of the optical film is preferably lower than 50 nm, the optical diaphragm comprises a transparent conductive layer, a hard coating layer, a light diffusion layer or a prism layer on one surface of the optical film, and the liquid display module is provided with the optical diaphragm.
Description
Technical field
The phase differential that the present invention relates to cause because of differential contraction stress changes little, that optical homogeneity is excellent blooming, optical sheet and LCD MODULE.
Background technology
LCD MODULE (LCD) utilizes characteristics such as it is thin, light, power consumption is low, how to use as flat-panel monitor, uses display device as information such as mobile phone, PDA(Personal Digital Assistant), personal computer, TVs, and the purposes of LCD MODULE enlarges year by year.Different according to purposes in recent years, have variously as the characteristic that LCD MODULE is required, that can give an example has bright (high brightnessization), is convenient to watch (wide visual angleization), energy-conservationization, Bao Qinghua, giant-screenization etc.
Described LCD MODULE generally has following structure: one side order is overlapping to the back side that liquid crystal display cells, various optical sheet and backlight arranged from a surperficial side.In addition, comprise the Polarizer screening glass that the Polarizer of holding liquid crystal box (liquid crystal セ Le) is protected as the optical sheet that in described LCD MODULE, uses and be configured in liquid crystal display cells and backlight between light diffusing sheet, prismatic lens, the transparent conductivity sheet that uses as transparency electrode etc. etc.
Described optical sheet generally has base material layer and is layered in the optical functional layer on this base material layer.As the resin that constitutes said base material layer, used (open communique spy open 2010-44146 number with reference to Jap.P.) such as so-called biaxial stretch-formed polyethylene terephthalate (PET) film that on cross one another both direction, stretches or polycarbonate in the past.In addition, as the resin of the base material layer that constitutes the Polarizer screening glass, use (open communique spy open 2006-235341 number with reference to Jap.P.) such as three cellulose acetate membranes bonding easily with the polyvinyl alcohol (PVA) Polarizer.
Because the photoelastic coefficient of the biaxial stretch-formed polyethylene terephthalate that used as the resin that constitutes base material layer, polycarbonate, Triafol T etc. is big in the past, the phase differential that produces because of the external force such as heating of display changes greatly.Its result has following problems: possess the LCD MODULE that in base material layer, uses the optical sheet of said resin, follow giant-screenization, the slimming of LCD, be difficult to display image subtly.
Patent documentation 1: Jap.P. open communique spy open 2010-44146 number
Patent documentation 2: Jap.P. open communique spy open 2006-235341 number
Summary of the invention
In view of described problem, the purpose of this invention is to provide a kind of phase differential that produces because of external force change little, optical homogeneity is excellent, can show the LCD MODULE of blooming, optical sheet and this optical sheet of use of meticulous image.
In order to solve described problem, blooming of the present invention is principal ingredient with the cyclic olefine copolymer.
Said blooming is a principal ingredient with photoelastic coefficient circlet olefin copolymer.Its result, the phase differential that this blooming can suppress to produce because of external force such as display heatings changes.Therefore, this blooming optical homogeneity is excellent, can show meticulous image.
Preferably, the photoelastic coefficient of said blooming is 10 * 10
-12Below/the Pa.Thus, you can reduce exposure to hot and humid environment changes the phase difference, and thus can inhibit the picture clarity (visibility) reduction, you can display more detailed images.
Preferably, the average thickness of said blooming is below 500 μ m more than the 10 μ m.If the average thickness of this blooming is less than said scope, then film strength, prevent that characteristic such as bending property from reducing, existence can not be tackled the problem of the giant-screenization of liquid crystal indicator.On the other hand, if the problem that the average thickness of this blooming greater than said scope, then exists the brightness of liquid crystal indicator to reduce is also violated the requirement to the liquid crystal indicator slimming in addition.
Preferably, the phase difference value of said blooming (リ タ デ one シ ョ Application value) absolute value (Re) is below 50nm.Thus, change effect can be suppressed, in addition, the distortion drawbacks such as (askew body) of image can be suppressed the polarization direction of transmitted ray.
Therefore, the optical sheet that at least one face of said blooming, has transparency conducting layer, hard conating, light diffusion layer or layers of prisms can improve optical characteristics, heat-resistant stability etc., and then the phase differential that can suppress to produce because of external force changes.Its result, this optical sheet can show meticulous image, and can promote giant-screenization, the slimming of liquid crystal indicator.
In addition, according to LCD MODULE with this optical sheet, because this optical sheet has excellent optical, heat-resistant stability etc., thus can show meticulous image, and can promote giant-screenization, the slimming of liquid crystal indicator.
Furthermore, the present invention the term "retardation value (Re)" is a film surface in the optical crystal axis on a plane perpendicular to the direction of the fast axis (fast axis) direction and the slow axis (rather late phase axis) the x and y directions, provided the optical film thickness is d, and let x direction and the y direction, refractive index nx and ny (nx ≠ ny), with Re = (ny-nx) d value calculated.
The phase differential that kind as described above, blooming of the present invention and optical sheet can suppress to produce because of external force changes, improves optical homogeneity.Therefore,, meticulous image can be shown, and giant-screenization, the slimming of liquid crystal indicator can be promoted according to blooming of the present invention, optical sheet and LCD MODULE.
Description of drawings
Fig. 1 is the cut-open view that schematically illustrates the blooming of one embodiment of the present invention.
Fig. 2 is the cut-open view that schematically illustrates the optical sheet with transparency conducting layer of one embodiment of the present invention.
Fig. 3 is the cut-open view that schematically illustrates the optical sheet with hard conating of one embodiment of the present invention.
Fig. 4 is the cut-open view that schematically illustrates the optical sheet with light diffusion layer of one embodiment of the present invention.
Fig. 5 is the cut-open view that schematically illustrates the optical sheet with layers of prisms of one embodiment of the present invention.
Description of reference numerals
1 blooming
11 optical sheets
12 base material layers
13 transparency conducting layers
21 optical sheets
22 hard conatings
31 optical sheets
32 light diffusion layers
41 optical sheets
42 layers of prisms
Embodiment
The suitable accompanying drawing of following reference is elaborated to embodiment of the present invention.
The blooming 1 of Fig. 1 is a principal ingredient with the cyclic olefine copolymer.
Blooming 1 be owing to need make light see through, and therefore need form transparent, particularly water white.
The so-called cyclic olefine copolymer that is used for blooming 1 is meant the amorphism annular ethylene series resin as the multipolymer of alkene such as cyclic olefin and ethene.Comprise many ring cyclic olefins and monocycle cyclic olefin as cyclic olefin.As what described many ring cyclic olefins can be given an example ENB arranged; The methyl ENB; The dimethyl ENB; The ethyl ENB; Ethylidene norbornene; The butyl ENB; Bicyclopentadiene; The dihydro bicyclopentadiene; The methyl bicyclic pentadiene; The dimethyl bicyclopentadiene; Tetracyclododecane; The methyl tetracyclododecane; Dimethyl tetracyclododecane (ジ メ チ Le シ Network ロ テ ト ラ De デ セ Application); Three cyclopentadiene (ト リ シ Network ロ ペ Application タ ジ エ Application); Fourth Ring pentadiene (テ ト ラ シ Network ロ ペ Application タ ジ エ Application) etc.As what the monocycle cyclic olefin can be given an example cyclobutane, cyclopentene, cyclooctene, cyclo-octadiene, cyclo-octatriene, cyclododecane triolefin etc. are arranged in addition.
Only otherwise the infringement transparency and desirable intensity, blooming 1 also can comprise other any compositions, preferably contains the above said cyclic olefine copolymer of 90 quality %, more preferably contains the said cyclic olefine copolymer more than the 98 quality %.Wherein as the example of any composition, have ultraviolet light absorber, stabilizing agent, lubricant, processing aid, plastifier, shock-resistant auxiliary agent, the phase differential that can give an example reduce agent, matting agent, antiseptic, mildewproof agent etc.
The thickness of blooming 1 (average thickness) does not have special qualification; For example preferably below the above 500 μ m of 10 μ m; More preferably below the above 450 μ m of 50 μ m; Further preferably below the above 400 μ m of 80 μ m, further preferably below the above 300 μ m of 90 μ m, particularly preferably be below the above 200 μ m of 100 μ m again.If the thickness of blooming 1 is less than said scope, then the intensity of blooming 1, prevent that bendability characteristics such as (scratching preventing property of body) from reducing, existence can not be tackled the problem of the giant-screenization of liquid crystal indicator.On the other hand, if the average thickness of blooming 1, then has the problem that the brightness of liquid crystal indicator reduces greater than said scope, also violate requirement in addition to the liquid crystal indicator slimming.
The photoelastic coefficient of blooming 1 does not have special qualification, for example is 10 * 10
-12Below/the Pa, preferably 9 * 10
-12Below/the Pa, particularly preferably be 8 * 10
-12Below/the Pa.If the photoelastic coefficient of blooming 1 is greater than said scope, the variation that then is exposed to the phase differential under the hot and humid environment is big, the problem that exists readability to reduce.On the other hand, change if the photoelastic coefficient of blooming 1 in said scope, then can reduce the phase differential that is exposed under the hot and humid environment, and then can suppress the reduction of picture readability, can show meticulous image.
The absolute value of the phase difference value of blooming 1 (Re) does not have special qualification, for example is below the 50nm, preferably below the 15nm, particularly preferably is below the 5nm.By the phase difference value (Re) that reduces blooming 1; For example blooming 1 is being used under the situation of light diffusing sheet; Of the change effect of this light diffusing sheet can be suppressed, this light diffusing sheet can be suppressed the axial optimization of transmission (optimization) and the controlled influence of polarisation to Polarizer etc. to the polarization direction of transmitted ray.In addition, be configured under the lip-deep situation of Polarizer, can suppress drawbacks such as anamorphose at blooming 1.
Usually can use arithmetic mean surface roughness (Ra) as blooming 1 is the blooming below 0.06 more than 0.02.In addition, can on blooming 1, carry out unglazed processing (マ Star ト processing) as required.The arithmetic mean surface roughness (Ra) of having implemented the blooming 1 after so no optical processing preferably can become more than 0.07 below 2, more preferably can become more than 0.1 below 1.Through the Roughness Surface on Control of blooming 1 in such scope, can prevent in the processing after former film (Off イ Le system former anti-) is made injuredly, improve usability.In addition, when the former film that produces is batched, need carry out embossing processing (annular knurl processed) usually, prevent into piece the Width two ends of film.Under the situation of having carried out the annular knurl processed on the film, owing to the into treatment sites at film two ends can not be used, so must be discarded this part severing.Batching in the operation of this external film covered (マ ス キ Application グ) in order to prevent damage with diaphragm sometimes.; Because the arithmetic mean surface roughness that makes blooming 1 is in described specialized range; Also can not prevent into piece so do not carry out the annular knurl processed, therefore can simplify manufacturing process, the two end portions of film Width also can be used; And can not produce the fault of film, can batch by long film.In addition, because blooming 1 has suitable surfaceness, the damage in the time of can suppressing to batch does not effectively need described covering yet.
The manufacturing approach of blooming 1 does not have special qualification, for example can utilize known in the past mixed method to mix adjuvants such as the sheet-shaped material of synthetic resin and plastifier, process thermoplastic resin composite in advance after, make blooming.After for example raw material being carried out premixed, can obtain described thermoplastic resin composite to the potpourri extruding that obtains is mixing with mixers such as universal mixers.In this case, pushing the mixing roll that uses in mixing does not have special qualification, for example can use known in the past mixing rolls such as extruder such as single screw extrusion machine, double screw extrusion machine or pressurization kneading machine.
As the manufacturing process of blooming 1, that can give an example has known method such as solution casting method (solution casting method), extrusion by melting, rolling process, compression forming method.Wherein preferably solution casting method (solution casting method), extrusion by melting.At this moment; Can use the thermoplastic resin composite of extruding in advance after mixing; Also can be dissolved in other adjuvants such as synthetic resin and plastifier respectively in the solvent, become uniform mixed liquor after, offer the film forming process of solution casting method (solution casting method) or extrusion by melting.
As the solvent that in solution casting method (solution casting method), uses, that can give an example has chlorine kind solvents such as methenyl choloride, methylene chloride; Toluene, xylene, benzene and their aromatic series series solvents such as mixed solvent; Alcohols solvents such as methyl alcohol, ethanol, isopropyl alcohol, normal butyl alcohol, 2-butanols; Methyl cellosolve, ethyl cellosolve, butyl cellosolve, dimethyl formamide, dimethyl sulfoxide (DMSO) 、 diox, cyclohexanone, tetrahydrofuran, acetone, methyl ethyl ketone (MEK), ethyl acetate, diethyl ether etc.Can only use a kind of in the said solvent, also can two or morely use together.As the device that is used to carry out solution casting method (solution casting method), that can give an example has drum-type casting machine, band casting machine, a rotary coating machine etc.
Extrusion by melting can be given an example has T modulus method, inflation method (イ Application Off レ one シ ョ Application method) etc.The forming temperature of the film when melt extruding is preferably more than 150 ℃ below 350 ℃, more preferably more than 200 ℃ below 300 ℃.Carrying out with the T modulus method under the situation that film is shaped, be installed in the leading section of known single screw extrusion machine or double screw extrusion machine to the T mould, batching and be extruded as membranaceous film, can obtain the film of roller shape.At this moment, suitably adjust the temperature of winding roller, extend extruding on the direction, can become the uniaxial tension operation through making film.In addition, through adding make film in the side vertical with extruding direction upwardly extending operation, can add one by one biaxial stretch-formedly, also can add operations such as simultaneously biaxial stretch-formed.
Blooming 1 can be a unstretching film, also can be stretched film.Under situation about stretching, can be monadic stretching membrane, also can be biaxially-stretched film.Under the situation that is biaxially-stretched film, can be the biaxial stretch-formed film that obtains of while, also can be one by one the biaxial stretch-formed film that obtains.Having passed through under the biaxial stretch-formed situation, can improve the physical strength of film, thereby improve the performance of film.
As at the draft temperature that carries out under the stretching process situation; Preferably near the glass transition temperature of the thermoplastic resin composite of pleurodiaphragmatic in terspace material, carry out; Specifically; Preferably under (glass transition temperature-30) ℃～(glass transition temperature+100) ℃, carry out, more preferably under (glass transition temperature-20) ℃～(glass transition temperature+80) ℃, carry out.If draft temperature is lower than (glass transition temperature-30) ℃, then owing to can not obtain enough stretching ratios, so be unfavorable.If draft temperature is higher than (glass transition temperature+100) ℃, then cause resin flow (Off ロ one), can not stably stretch, so be unfavorable.
Preferably can be with area in the scope below 25 times more than 1.1 times than the stretching ratio of definition, more preferably can be in the scope below 10 times more than 1.3 times.If stretching ratio is less than 1.1 times, then owing to following stretching can not cause toughness to improve, so be unfavorable.If stretching ratio greater than 25 times, even then improve stretching ratio, can not obtain corresponding effects.
Draw speed (direction) preferably 10～20000%/minute scope, more preferably 100～10000%/minute scope.If draw speed (direction) is lower than 10%/minute, then need the long period owing to will obtain enough stretching ratios, cause manufacturing cost to increase, be unfavorable therefore.If draw speed (direction) is higher than 20000%/minute, then there is problem such as cause that stretched film is broken, be unfavorable therefore.In addition, stable for the optical isotropy that makes blooming 1 and mechanical characteristic, also can after stretch processing, heat-treat (annealing) etc.
There is not special qualification as plastifier, can interactional functional group but preferably have through hydrogen bond etc. and synthetic resin, it is fuzzy to make that blooming 1 does not produce, or does not ooze out (Block リ one De ア ウ ト) or volatilization from blooming 1.Example as described plastifier does not have special qualification, and the phosphate that has that can give an example is that plastifier, phthalic acid ester are that plastifier, trimellitate are that plastifier, Pyromellitic Acid are that plastifier, polyvalent alcohol are that plastifier, glycolic acid esters are that plastifier, citrate are that plastifier, fatty acid ester are that plastifier, carboxylate are that plastifier, polyester are plastifier etc.
Said blooming 1 is a principal ingredient with photoelastic coefficient circlet olefin copolymer.Its result, the phase differential that this blooming 1 can suppress to produce because of external force such as display heatings changes.Therefore, the optical homogeneity of this blooming 1 is excellent, can show meticulous image.
The optical sheet 11 of Fig. 2 comprises the base material layer 12 and transparency conducting layer 13 that is made up of blooming 1.Optical sheet 11 has transparency conducting layer 13 in a face laminated of base material layer 12.
Transparency conducting layer 13 can be used as amorphous layer and constitutes, and also can be used as crystallizing layer and constitutes.In addition, transparency conducting layer 13 also can be used as the layer formation of amorphous and crystallized mixed.The thickness of transparency conducting layer 13 (average thickness) does not have special qualification, for example can be below the above 100nm of 10nm.
As what the manufacturing approach of optical sheet 11 can be given an example sputtering method arranged, for example this sputtering method uses and contains In in containing the mixed gas of sputter with G&O
2O
3And SnO
2Target carry out sputter.Except the magnetron sputtering system of the standard of use direct supply, can also adopt various sputtering methods such as RF (radio frequency, radio frequency) sputtering method, two magnetron sputtering methods as this sputtering method.
In addition, for the manufacturing of transparency conducting layer 13, also can under atmosphere of inert gases such as argon gas or nitrogen, carry out surface modification treatment such as plasma treatment as required and be used as pre-treatment.In addition, also can form transparency conducting layer 13 across this internal coating in a face laminated internal coating of base material layer 12.
This optical sheet 11 is because as base material layer 12 use cyclic olefine copolymers, so can improve optical characteristics, heat-resistant stability etc.The phase differential that this optical sheet 11 can suppress to produce because of external force changes, and can suppress generation and show inhomogeneous.Therefore, this optical sheet 11 can show meticulous image, and can promote giant-screenization, the slimming of liquid crystal indicator.
The optical sheet 21 of Fig. 3 comprises the base material layer 12 and hard conating 22 that is made up of blooming 1.Optical sheet 21 has hard conating 22 in a face laminated of base material layer 12.
Resin as forming hard conating 22 does not have special qualification, and that can give an example has an active energy line curing resin.The urethane acrylate that has that can give an example as the example of this active energy line curing resin is that resin, polyester acrylate are that resin, epoxy acrylate are that resin, polyalcohol acrylate are resin, epoxy resin etc.The thickness of hard conating 22 (average thickness) does not have special qualification, for example can be below 50 μ m more than the 3 μ m.
Through carrying out drying behind the coating active energy line curing resin on the face of base material layer 12, can make optical sheet 21.As the method for coating active energy line curing resin so long as can on a face of base material layer 12, evenly be coated with the method for active energy line curing resin; Just do not have special qualification, have method of spin coating, spraying process, the ramp type that can give an example are coated with the whole bag of tricks such as (ス ラ イ De コ one ト) method, dip coated method, excellent rubbing method, roll method, silk screen print method.
This optical sheet 21 is because as base material layer 12 use cyclic olefine copolymers, so can improve optical characteristics, heat-resistant stability etc.This optical sheet 21 can improve heat-resistant stability etc., and the phase differential that can suppress to produce because of external force changes.In addition, this optical sheet 21 so can improve the mar resistance ability, can improve the easy property of use because of having hard conating 22.
The optical sheet 31 of Fig. 4 comprises the base material layer 12 and light diffusion layer 32 that is made up of blooming 1.Light diffusion layer 32 is layered on the face of base material layer 12 and forms optical sheet 31.
Light diffusion layer 32 has concaveconvex shape small and at random on the surface.Light diffusion layer 32 has the function that makes the transmitted ray diffusion because of the small concaveconvex shape on surface.The concaveconvex shape that light diffusion layer 32 is had can form through the light diffusing agent that is dispersed in the cementing agent.
The light diffusing agent that is used for light diffusion layer 32 is the particle with the character that makes the light diffusion, mainly is divided into inorganic filler and organic filling material.Specifically, can use silicon dioxide, hydrate of aluminium, aluminium oxide, zinc paste, barium sulphate, magnesium silicate or their potpourri as inorganic filler.In addition, the concrete material as organic filling material can use acryl resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile, polyamide etc.Wherein, preferably transparent high acryl resin particularly preferably is polymethylmethacrylate (PMMA).Shape as light diffusing agent does not have special qualification, and having of can giving an example is spherical, spindle shape, needle-like, bar-shaped, cubic, tabular, flakey, fibrous etc., wherein the excellent spherical beads of light diffusing preferably.
The lower limit of the mean grain size of light diffusing agent is 1 μ m preferably, particularly preferably is 2 μ m, further 5 μ m preferably.On the other hand, the upper limit of the mean grain size of light diffusing agent is 50 μ m preferably, particularly preferably are 20 μ m, further 15 μ m preferably.If the mean grain size of light diffusing agent is less than said scope, concavo-convex the diminishing on light diffusion layer 32 surfaces that then form by light diffusing agent, exist the light diffusing that can not satisfy the demand as optical sheet 31 can problem.On the contrary, if the mean grain size of light diffusing agent greater than said scope, then the thickness of optical sheet 31 increases and is difficult to spread equably.
As the amount of allocating into of light diffusing agent (with respect to 100 parts in the matrix material polymkeric substance in the polymer composition that forms material as cementing agent; Be converted into the amount of allocating into of solid constituent) preferably 10 parts of lower limits; Particularly preferably be 20 parts, further preferably 50 parts, as preferably 500 parts of the upper limits of this amount of allocating into; Particularly preferably be 300 parts, further preferably 200 parts.The amount of allocating into of light diffusing agent is less than said scope if this is, then light diffusing is insufficient, on the other hand, if the amount of allocating into of light diffusing agent greater than said scope, then the effect of fixed light diffusant reduces.In addition; At light diffusing sheet is to be configured on the what is called of surface one side of prismatic lens under the situation with light diffusing sheet; Owing to do not need high light diffusing, so as the amount of allocating into of light diffusing agent preferably more than 10 parts below 40 parts, particularly preferably be more than 10 parts below 30 parts.
Through containing the polymer composition crosslinking curing of matrix material polymkeric substance, form cementing agent.Dispose and the fixed light diffusant to isodensity substantially on the surface of base material layer 12 through this cementing agent.In addition; The polymer composition that is used to form cementing agent for example also can suitably be allocated small inorganic filler, hardening agent, antistatic agent, plastifier, spreading agent, various levelling agent, ultraviolet light absorber, anti-oxidant, viscosity modifier, lubricant, light stabilizer etc. into except the matrix material polymkeric substance.
There is not special qualification as said matrix material polymkeric substance; Have acrylic resin, polyurethane, dacron, fluorine resin, the silicon that can give an example are resin, polyamide-imides, epoxy resin, ultraviolet curing resin etc., can use a kind of said matrix material polymkeric substance also can mix and use two or more said matrix material polymkeric substance.Particularly preferably be the polyvalent alcohol that methods such as good processability, usefulness coating can easily form light diffusion layer 32 as said matrix material polymkeric substance.In addition, from improving the diactinic viewpoint of light, the matrix material polymkeric substance that in cementing agent, uses itself is preferably transparent, particularly preferably is water white.
As said polyvalent alcohol, polyester polyol preferably, or the acrylic polyol that obtains the monomer component polymerization that contains the hydroxyl unsaturated monomer and have (methyl) acrylic acid units etc.As the cementing agent good weatherability of matrix material polymkeric substance, can suppress light diffusion layer 32 flavescence etc. to described polyester polyol or acrylic polyol.In addition, any one of the pure and mild acrylic polyol of said polyester polyols can be used, also both sides can be used.
In addition; Hydroxyl number in the pure and mild acrylic polyol of said polyester polyols so long as each molecule have more than two; Just have no particular limits; If the hydroxyl value in the solid constituent, then has the tendency that coverlay rerum naturas such as the crosslinked minimizing of counting, solvent resistance, water tolerance, thermotolerance, skin hardness reduce below 10.
The polyvalent alcohol that preferably has naphthenic base as said matrix material polymkeric substance.Through in polyvalent alcohol, importing naphthenic base as the matrix material polymkeric substance that forms cementing agent, can improve the hydrophobicitys such as water repellency, water tolerance of cementing agent, can improve the resistance to bend(ing), dimensional stability of the optical sheet 31 under hot and humid condition etc.In addition, can improve the key property of filming such as weatherability, hardness, satiety, solvent resistance of light diffusion layer 32.In addition, compatibility and the uniformly dispersed of small inorganic filler with the small inorganic filler that is fixed with organic polymer on the surface improves.
Do not have special qualification as said naphthenic base, that can give an example has cyclobutyl, cyclopentyl, cyclohexyl, suberyl, ring octyl group, ring nonyl, ring decyl, ring undecyl, cyclo-dodecyl, ring tridecyl, ring myristyl, cyclopentadecane base, ring cetyl, ring heptadecyl, a ring octadecyl etc.
Through a polymerism unsaturated monomer copolymerization, the polyvalent alcohol that can obtain having said naphthenic base with naphthenic base.The polymerism unsaturated monomer that what is called has naphthenic base is meant the polymerism unsaturated monomer that in molecule, has at least one naphthenic base.Do not have special qualification as this polymerism unsaturated monomer, that can give an example has cyclohexyl (methyl) acrylic ester, methylcyclohexyl (methyl) acrylic ester, tert-butylcyclohexyl (methyl) acrylic ester, cyclo-dodecyl (methyl) acrylic ester etc.
In addition, in polymer composition, also can contain isocyanates as hardening agent.Through in polymer composition, containing isocyanate curing agent, can become more firm cross-linked structure, further improve the coverlay rerum natura of light diffusion layer 32.Use and the same material of said polyfunctional isocyanate's compound as this isocyanates.Wherein, preferably can prevent the fatty family isocyanates of coverlay flavescence.
Particularly using as the matrix material polymkeric substance under the situation of polyvalent alcohol; As the hardening agent of allocating in the polymer composition; Can use in hexamethylene diisocyanate, IPDI (イ ソ Off ロ Application ジ イ ソ シ ア ネ one ト) and the XDI any one, also can use the two or more mixing in hexamethylene diisocyanate, IPDI and the XDI.If use described hardening agent; Then because the curing reaction speed of polymer composition becomes big; Even use the antistatic agent of the kation system of the dispersion stabilization help small inorganic filler as antistatic agent, also can fully compensate because of kation is the reduction of the curing reaction speed that causes of antistatic agent.In addition, the raising of the curing reaction speed of polymer composition helps small inorganic filler uniformly dispersed in cementing agent.Its result can significantly suppress bending and the flavescence that optical sheet 31 causes because of heat, ultraviolet ray etc.
In addition, in said polymer composition, also can contain ultraviolet light absorber.Through forming cementing agent from the polymer composition that contains ultraviolet light absorber, give this optical sheet 31 and cut off ultraviolet function, can cut off the trace ultraviolet ray of sending from the lamp of backlight unit, thus the destruction that can prevent to cause liquid crystal layer because of ultraviolet ray.
As described ultraviolet light absorber so long as can absorb the ultraviolet ray and convert heat energy effectively to and, just do not have special qualification for only stable compound, can use known ultraviolet light absorber.Wherein, Preferably the UVA function strong, with the intermiscibility salicylic acid good, stable existence in the matrix material polymkeric substance of said matrix material polymkeric substance be that ultraviolet light absorber, benzophenone series ultraviolet light absorber, benzotriazole are that ultraviolet light absorber and cyanoacrylate are ultraviolet light absorber, can use one or more that from this group ultraviolet light absorber, select.In addition, as ultraviolet light absorber, also be fit to use polymkeric substance that the UVA group is arranged (for example " ユ one ダ Block Le UV " series of (strain) Japanese catalyst etc.) on strand.Through using this polymkeric substance that UVA group is arranged on strand, high with the intermiscibility of the main polymer of cementing agent, can prevent the deterioration that causes the UVA function such as to ooze out because of ultraviolet light absorber.In addition, also can be the matrix material polymkeric substance of the polymkeric substance that on strand, has the UVA group as cementing agent.In addition, also can this bonding have the polymkeric substance of UVA group as the matrix material polymkeric substance of cementing agent, and and then make in this matrix material polymkeric substance and contain ultraviolet light absorber, can further improve the UVA function.
As the lower limit of said ultraviolet light absorber with respect to the content of the matrix material polymkeric substance of cementing agent; Preferably 0.1 quality % particularly preferably is 1 quality %, further 3 quality % preferably; The upper limit as the said content of ultraviolet light absorber; Preferably 10 quality % particularly preferably are 8 quality %, further 5 quality % preferably.Ultraviolet light absorber is littler than said lower limit with respect to the mass ratio of matrix material polymkeric substance if this is; Then optical sheet 31 can not be brought into play the UVA function effectively; On the contrary; If the mass ratio of ultraviolet light absorber greater than the said upper limit, then can have baneful influence to the matrix material polymkeric substance, cause the reduction such as intensity, permanance of cementing agent.
Also can substitute said ultraviolet light absorber uses ultra-violet stabilizer or uses ultra-violet stabilizer (being included in the matrix material polymkeric substance that bonding on the strand has the UV stable group) with ultraviolet light absorber.Utilize this ultra-violet stabilizer can make, thereby can improve UV stable and weatherability etc. because of passivation such as free radical that ultraviolet ray produces, active oxygens.Being fit to use the high hindered amine of UV stable as this ultra-violet stabilizer is ultra-violet stabilizer.In addition, through using ultraviolet light absorber and ultra-violet stabilizer together, can prevent the deterioration that causes because of ultraviolet ray and significantly improve weatherability.
In addition, can mixing antistatic agent in polymer composition.Through forming cementing agent from this mixing polymer composition that antistatic agent arranged, can make this optical sheet 31 have anlistatig effect, can prevent to adsorb dust and become and prismatic lens etc. is difficult to the rough sledding that produces because of static electrification such as overlapping.In addition,, then surfaces of tacky and dirt can be produced, but, such drawback can be reduced through mixing antistatic agent in polymer composition if at the surface coated antistatic agent.Do not have special qualification as described antistatic agent, for example can use negative ion such as alkyl sulfate, alkylphosphonic is antistatic agent; Kation such as quaternary ammonium salt, imidazolinium compounds is an antistatic agent; Nonionics such as polyglycol system, polyoxyethylene sorbitan monostearate, glycollyl amine are antistatic agent; Macromolecular antistatic agent such as polyacrylic acid etc.Wherein, preferably the reasonable kation of antistatic effect is an antistatic agent, and a small amount of interpolation just has anlistatig effect.
In addition, optical sheet 31 also can prevent adhesion layer (not expression among the figure) in another face laminated of base material layer 12.This prevents that adhesion layer has following structure: a spot of pearl separately is dispersed in the cementing agent; The bottom of described pearl is outstanding from the back side of cementing agent, can prevent that the back side (with the range upon range of opposite face of face that light diffusion layer 32 is arranged) and the LGP surface etc. because of optical sheet 31 are adjacent to the rough sledding that produces interference fringe.
As the manufacturing approach of optical sheet 31, what can give an example is the manufacturing approach that comprises following operation, and said operation is: (a) through mixed light diffusant in the composition that forms cementing agent, make the operation of light diffusion layer with composition; And (b) be stacked in base material layer 12 surface to light diffusion layer with composition layer and go up and make it to solidify, thereby form the operation of light diffusion layer 32.Method as being stacked in described light diffusion layer 32 usefulness composition layers on the base material layer 12 does not have special qualification, and that can give an example has the whole bag of tricks such as method of spin coating, spraying process, ramp type rubbing method, dip coated method, excellent rubbing method, roll method, silk screen print method.In addition, when range upon range of light diffusion layer 32, as required, also can carry out the surface modification treatment such as plasma treatment under atmosphere of inert gases such as argon gas or nitrogen as pre-treatment.
This optical sheet 31 is owing to use cyclic olefine copolymer as base material layer 12, so can improve optical characteristics and heat-resistant stability etc.This optical sheet 21 can improve heat-resistant stability etc., can suppress the variation because of the phase differential of external force generation.
In addition; In liquid crystal indicator; In order to improve the utilization ratio of light; Polarized light property to backlight and various optical sheets etc. designs, and makes that the polarization direction (the maximum planes direction of the polarized component of light) of incident ray is consistent with the transmission direction of the Polarizer (or reflection Polarizer of its back side one side) of the back side one side of liquid crystal display cells.Therefore; The absolute value of the phase difference value (Re) of the base material layer 12 through making optical sheet 31 is below the 50nm; Preferably making the absolute value of phase difference value (Re) of the base material layer 12 of optical sheet 31 is below the 15nm; The absolute value that particularly preferably is the phase difference value (Re) of the base material layer 12 that makes optical sheet 31 is below the 5nm; Can suppress the change effect of the polarization direction of 31 pairs of transmitted rays of this optical sheet, suppress of transmission axial optimization and the controlled influence of 31 pairs of polarisations of this optical sheet to Polarizer etc.
The optical sheet 41 of Fig. 5 comprises the base material layer 12 and layers of prisms 42 that is made up of blooming 1.Layers of prisms is layered on the face of base material layer 12 and forms optical sheet 41, a plurality of raised line prism portion is formed striated and constitutes said layers of prisms.
Utilize a plurality of raised line prism portion form striated from the teeth outwards, layers of prisms 42 has high with the function of light to the refraction of normal direction one side.
Layers of prisms 42 be owing to need make light see through, thus by transparent, particularly water white synthetic resin is processed, and can use the resin with identical or different one or more of base material layer 12.Constitute the lower limit preferably 1.3 of refractive index of the material of layers of prisms 42, particularly preferably be 1.45, constitute the upper limit preferably 1.8 of refractive index of the material of layers of prisms 42, particularly preferably be 1.6.
Raised line prism portion is triangular prism shaped.It is that 90 °, base angle are 45 ° equilateral right-angle triangles that the cross sectional shape of raised line prism portion is generally drift angle.
The lower limit of the bottom width (W) of raised line prism portion is 10 μ m preferably, particularly preferably are 30 μ m.On the other hand, the upper limit of said width (W) is 1000 μ m preferably, particularly preferably are 400 μ m.The bottom width (W) of raised line prism portion then is difficult to form raised line prism portion less than said lower limit if this is, on the contrary, if greater than the said upper limit, then there are problems such as generation is dazzling, brightness irregularities in the bottom width (W) of raised line prism portion.
The manufacturing approach of optical sheet 41 is as long as can form said structure; Just there is not special qualification; Can be to make that base material layer 12 backs form the method for layers of prisms 42 in addition and the integrally formed method of base material layer 12 and layers of prisms 42; Specifically, the manufacturing approach of optical sheet 41 comprises following method:
(a) be layered in synthetic resin on the thin slice mould that is shaped as negative shape (シ one ト type) that has with the surface of layers of prisms 42,, form the method for optical sheet 41 through peeling off said thin slice mould;
(b) inject the injection moulding have with the mould that is shaped as negative shape on the surface of layers of prisms 42 to molten resin;
(c) form that resin behind the thin slice heats again and with its be clipped in aforementioned identical mould and sheet metal between pressurize the method for transfer printing shape;
(d) resin of molten condition is had through side face and the roller die tool that is shaped as negative shape on the surface of layers of prisms 42 and other rollers between come the said shape of transfer printing extrude the thin slice forming process;
(e) on base material layer 12, be coated with ultraviolet curing resin; And have with described identical, push with the thin slice mould that is shaped as negative shape, mould or the roller die tool on the surface of layers of prisms 42; Transfer printing shape on uncured ultraviolet curing resin, irradiation ultraviolet radiation makes the method that ultraviolet curing resin solidifies then;
(f) have with described identical, with the mould that is shaped as negative shape on the surface of layers of prisms 42 or roller die tool on fill the uncured ultraviolet curing resin of coating; Press and make it smooth with base material layer 12 again, the method that irradiation ultraviolet radiation solidifies ultraviolet curing resin; And
(g) the electronic beam solidified resin of use substitutes the method for ultraviolet curing resin etc.
This optical sheet 41 is owing to use cyclic olefine copolymer as base material layer 12, so can improve optical characteristics and heat-resistant stability etc.This optical sheet 41 can improve heat-resistant stability etc., and the phase differential that can suppress to produce because of external force changes.
In addition; In liquid crystal indicator; In order to improve the utilization ratio of light; Polarized light property to backlight and various optical sheets etc. designs, and makes that the polarization direction (the maximum planes direction of the polarized component of light) of incident ray is consistent with the transmission direction of the Polarizer (or reflection Polarizer of its back side one side) of the back side one side of liquid crystal display cells.Therefore; The absolute value of the phase difference value (Re) of the base material layer 12 through making this optical sheet 41 is below 50nm; Preferably below 15nm; Particularly preferably be below 5nm, can suppress the change effect of the polarization direction of 41 pairs of transmitted rays of this optical sheet, can suppress of transmission axial optimization and the controlled influence of 41 pairs of polarisations of this light diffusing sheet to Polarizer etc.
Embodiment
According to embodiment the present invention is described in detail below, but the content that should not be construed to according to this embodiment limits the present invention.
Embodiment 1
Use cyclic olefine copolymer (" TOPAS 8007 " of Port リ プ ラ ス チ Star Network manufactured), after predrying, use single screw extrusion machine (L/D=35) on chill roll, to melt extrude, using ejector to make thickness is the blooming of 100 μ m.
Through sputter process the blooming that utilizes embodiment 1 and be made into is carried out ITO and handle, having made has the optical sheet of transparency conducting layer (transparent conductivity sheet) on a face of blooming.
Embodiment 3
On the blooming that utilizes embodiment 1 to be made into, being coated with hard coating agent (" purple light UV-7605B " that The Nippon Synthetic Chemical Industry Co., Ltd makes) and making the thickness of hard conating is 5 μ m; And it is solidified, made the optical sheet (hard coating film) that hard conating is arranged on a face of blooming.
Embodiment 4
Through coating mixed on the blooming that utilizes embodiment 1 to be made into the coating of light diffusing agent is arranged, made the optical sheet (light diffusing sheet) that light diffusion layer is arranged on a face of blooming.
Embodiment 5
(" SR-3000 " that Hitachi Chemical Co., Ltd. makes of the dried light solidified membrane of pressurizing attaching on the blooming that utilizes embodiment 1 to be made into; Be formed with on the shaping dies of relief pattern under decompression state with roller heating, pressurization; On dried light solidified membrane, form relief pattern; Irradiation ultraviolet radiation solidifies dried light solidified membrane, separates from shaping dies, has made the optical sheet (prismatic lens) that layers of prisms is arranged on a face of blooming.
Comparative example 1
Use polycarbonate-based resin (Idemitsu Kosen Co., Ltd. make " タ Off ロ Application A2200 "), likewise made the blooming of thickness 100 μ m with embodiment 1.
Comparative example 2
Through sputter process the blooming that utilizes comparative example 1 and be made into is carried out ITO and handle, having made has the optical sheet of transparency conducting layer (transparent conductivity sheet) on a face of blooming.
Comparative example 3
The coating hard coating agent identical and to make the thickness of hard conating be 5 μ m on the blooming that utilizes comparative example 1 to be made into embodiment 3, and make its curing, made the optical sheet (hard coating film) that hard conating is arranged on a face of blooming.
Comparative example 4
Through the coating coating that is mixed with light diffusing agent identical on the blooming that utilizes comparative example 1 to be made into, made the optical sheet (light diffusing sheet) that light diffusion layer is arranged on a face of blooming with embodiment 4.
Comparative example 5
The blooming that utilizes comparative example 1 to be made into is carried out the processing identical with embodiment 5, made the optical sheet (prismatic lens) that layers of prisms is arranged on a face of blooming.
In the backlight unit of slim liquid crystal indicator, use light diffusing sheet and the prismatic lens of embodiment 4 and embodiment 5; Use the hard coating film of embodiment 3 as the Polarizer screening glass of this liquid crystal indicator; Use the transparent conductivity sheet of embodiment 2 in addition as the transparency electrode of this liquid crystal indicator, in 60 ℃, the hot and humid groove of 85%RH, carried out 96 hours some lantern test.In addition; Likewise; In the backlight unit of slim liquid crystal indicator, use the light diffusing sheet and the prismatic lens of comparative example 4 and comparative example 5; Use the hard coating film of comparative example 3 as the Polarizer screening glass of this liquid crystal indicator, use the transparent conductivity sheet of comparative example 2 in addition as the transparency electrode of this liquid crystal indicator, in 60 ℃, the hot and humid groove of 85%RH, carried out 96 hours some lantern test.Its result is shown in the below table 1.
Deformation evaluating
Behind said some lantern test, take off the optical sheet of each embodiment and comparative example, estimate having or not distortion by following benchmark with the method for range estimation.
Zero: do not observe distortion.
*: observe distortion.
See the picture of the evaluation (see Sakae え Evaluation)
Passed through in 96 hours from the said on-test of lighting a lamp and to have confirmed display frame, the variation of display frame has been estimated by following benchmark with the mode of range estimation.
Zero: do not observe the variation of display frame.
*: observe the coloured variation of display frame ((white ボ ケ) turns white).
Table 1
Shown in said table 1; From the optical sheet of embodiment 2 to embodiment 5, do not observing distortion; Also do not observe display frame in addition and turn white, thereby the optical sheet of having confirmed embodiment 2 to embodiment 5 has desired enough resistivities to external force such as heatings.On the other hand,, also observe display frame in addition and turn white, do not have desired enough resistivities to the optical sheet of comparative example 5 to external force such as heatings so confirmed comparative example 2 observing distortion 5 the optical sheet from comparative example 2 to comparative example.
Industrial applicibility
As stated, blooming of the present invention and optical sheet change little and the optical homogeneity excellence because of the phase differential of external force generation.Therefore, blooming of the present invention, optical sheet and LCD MODULE can show meticulous picture, and are fit to promote giant-screenization, the slimming of liquid crystal indicator.
Claims (9)
1. a blooming is characterized in that, this blooming is principal ingredient with the cyclic olefine copolymer.
2. blooming according to claim 1 is characterized in that, photoelastic coefficient is 10 * 10
-12Below/the Pa.
3. blooming according to claim 1 and 2 is characterized in that, average thickness is below the above 500 μ m of 10 μ m.
4. blooming according to claim 1 is characterized in that, the absolute value of phase difference value (Re) is below the 50nm.
5. an optical sheet is characterized in that, this optical sheet has transparency conducting layer at least one face of blooming as claimed in claim 1.
6. an optical sheet is characterized in that, this optical sheet has hard conating at least one face of blooming as claimed in claim 1.
7. an optical sheet is characterized in that, this optical sheet has light diffusion layer at least one face of blooming as claimed in claim 1.
8. an optical sheet is characterized in that, this optical sheet has layers of prisms at least one face of blooming as claimed in claim 1, and this layers of prisms forms through a plurality of raised line prism portion is formed striated.
9. a LCD MODULE is characterized in that, has like each described optical sheet in the claim 5 to 8.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011088698A JP2012220854A (en) | 2011-04-12 | 2011-04-12 | Optical film, optical sheet, and liquid crystal display module |
| JP2011-088698 | 2011-04-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102736134A true CN102736134A (en) | 2012-10-17 |
| CN102736134B CN102736134B (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210105507.4A Expired - Fee Related CN102736134B (en) | 2011-04-12 | 2012-04-11 | Back light unit prismatic lens and LCD MODULE |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2012220854A (en) |
| KR (2) | KR101425114B1 (en) |
| CN (1) | CN102736134B (en) |
| TW (1) | TWI459058B (en) |
Cited By (2)
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| CN104007579A (en) * | 2013-02-25 | 2014-08-27 | 惠和株式会社 | Ultrathin liquid crystal backlight guide light film, ultrathin liquid crystal backlight unit and portable computer |
| CN108603970A (en) * | 2016-02-05 | 2018-09-28 | 三菱化学株式会社 | Optical laminate and the image display device for having used the optical laminate |
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| JP6293414B2 (en) * | 2013-02-25 | 2018-03-14 | 恵和株式会社 | Light guide film for ultra-thin liquid crystal backlight, ultra-thin liquid crystal backlight unit, and portable computer |
| KR20150142440A (en) | 2014-06-12 | 2015-12-22 | 동우 화인켐 주식회사 | Process for Preparing Polarizing Plate |
| WO2016159406A1 (en) * | 2015-03-31 | 2016-10-06 | 코오롱인더스트리 주식회사 | Coc-based optically isotropic film and method for manufacturing same |
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Also Published As
| Publication number | Publication date |
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| TWI459058B (en) | 2014-11-01 |
| KR20140088855A (en) | 2014-07-11 |
| KR20120116358A (en) | 2012-10-22 |
| JP2012220854A (en) | 2012-11-12 |
| CN102736134B (en) | 2016-02-03 |
| TW201303391A (en) | 2013-01-16 |
| KR101425114B1 (en) | 2014-08-01 |
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