CN100538407C - The light diffusing sheet that is used for display device - Google Patents
The light diffusing sheet that is used for display device Download PDFInfo
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- CN100538407C CN100538407C CNB2007101260769A CN200710126076A CN100538407C CN 100538407 C CN100538407 C CN 100538407C CN B2007101260769 A CNB2007101260769 A CN B2007101260769A CN 200710126076 A CN200710126076 A CN 200710126076A CN 100538407 C CN100538407 C CN 100538407C
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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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- 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
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
- C08L33/12—Homopolymers or copolymers of methyl methacrylate
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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
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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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
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
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Abstract
A kind of light diffusing sheet that is used for display device, comprise basic unit and at least one coating in described basic unit, described basic unit has the base resin potpourri of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2～20ppwb, and described coating comprises the UV absorbing agent of copolymer of methyl methacrylatestyrene subcoat resin, second light diffusing agent of about 0.1～30ppwb, about 0.01～2ppwb and the antistatic agent of about 0.001～10ppwb.
Description
Technical field
Embodiment of the present invention relate to the light diffusing sheet that is used for display device.More specifically, embodiment of the present invention relate to the light diffusing sheet with improved photostability, optical efficiency and diffusible LCD.
Background technology
Generally speaking, LCD (LCD) is meant flat-panel monitor, described flat-panel monitor can be by putting on electric field in two liquid crystal between the substrate, and by control electric field intensity control by external light source be back lighting device (BLU) emission by the amount of the light of substrate display image.Therefore, conventional LCD can have BLU on its rear surface.
Conventional BLU can be marginal mode BLU promptly, the BLU that uses in thin monitor such as notebook or the desk-top computer monitor, or straight-down negative BLU, the i.e. BLU that uses among large-scale device such as the LCD TV.Conventional straight-down negative BLU can comprise light source, and this light source can be launched by at least one reflector plate and light diffusing sheet light perpendicular to the LCD panel.But the light of light diffusing sheet scattering light source emission is to provide even light distribution on whole LCD panel.Conventional light diffusing sheet can be included in the light diffusing agent on transparent thermoplastic basement membrane such as methacrylic acid, styrene, cycloolefin or the polycarbonate resin.
Yet, when BLU is used for as large LCD TVs, can increase amount by the light of light emitted so that enough brightness to be provided.The light of this recruitment can substantially increase the heat among the BLU, thereby makes the light diffusing sheet distortion.More specifically, be used to form the conventional base resin of the transparent basement membrane in traditional light diffusing sheet such as methacrylic acid and styrene resin may since the too much heat of BLU light source generation be out of shape, thereby make the display performance distortion of LCD panel.Therefore, need can Nai Gaore to show simultaneously the light diffusing sheet of enough optical property and formability.
Summary of the invention
Therefore, embodiment of the present invention relate to light diffusing sheet, and this light diffusing sheet has overcome one or more shortcoming of the prior art substantially.
Therefore, embodiment of the present invention feature provides the sunproof light diffusing sheet with enhancing that is used for display device.
By the light diffusing sheet that is provided for display device can realize in above-mentioned and further feature of the present invention and the advantage one of at least, described light diffusing sheet comprises basic unit and at least one coating in described basic unit, described basic unit comprises the base resin potpourri of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2ppwb～about 20ppwb, and described coating comprises copolymer of methyl methacrylatestyrene subcoat resin (base coating resin), second light diffusing agent (diffuser) of about 0.1ppwb～about 30ppwb, the UV absorbing agent of about 0.01ppwb～about 2ppwb and the antistatic agent of about 0.001ppwb～about 10ppwb.Described basic unit can have the thickness of about 100 μ m～about 10000 μ m.Described coating can have the thickness of about 10 μ m～about 1000 μ m.
Methacrylate-the styrol copolymer of basic unit can comprise about methacrylate monomers of 2%～about 20% (by weight) and about styrene monomer of 80%～about 98% (by weight).The copolymer of methyl methacrylatestyrene of basic unit can comprise about methyl methacrylate monomer of 6%～about 94% (by weight) and about styrene monomer of 6%～about 94% (by weight).First light diffusing agent of basic unit can comprise the acrylate component of the about 1 μ m of the mean diameter of about 0.1ppwb～about 10ppwb～silicone components of about 20 μ m and the about 1 μ m of the mean diameter of about 0.1ppwb～about 10ppwb～about 20 μ m.
Second light diffusing agent of coating can comprise that mean diameter is that about 1 μ m～acrylate component of about 50 μ m, mean diameter are the silicone components of about 1 μ m～about 20 μ m, or its combination.Described silicone components can comprise dimethyl silicone polymer, poly-di-ethyl siloxane and/or have in the silicones of tridimensional network one or more.Described acrylate component can comprise one or more in methyl methacrylate, Jia Jibingxisuanyizhi, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, methacrylic acid benzene methyl, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate and/or the acrylic acid benzene methyl.
The UV absorbing agent of coating can absorb the UV radiation of about 250nm～about 280nm.Described UV absorbing agent can comprise one or more in benzophenone, benzotriazole, cyanoacrylate and/or the nickel complex salt.The antistatic agent of coating can comprise one or more in the following material: polyetherimide amine amide, polyether ester, polyether ester amides, poly alkylene glycol, dodecylbenzene sulfonic acid alkali metal salt, tertiary amine, quaternary ammonium, sodium chloride and/or alkyl amine.Described coating also can comprise gas-development agent, plastifier, antioxidant, thermal stabilizer, lubricant, fire retardant, filler, separant (releaseagent), dyestuff, pigment, water-dropping proof agent (anti-dropping agent), nucleator, light stabilizer, and/or their combination.
Coating can comprise embossed pattern.Described embossed pattern can be unbodied, and can have the surfaceness of about 0.1 μ m～about 20 μ m.Described coating also can comprise light stabilizer.Light diffusing sheet can comprise two coatings.Basic unit can be between two coatings.
By provide BLU also can realize in above-mentioned and further feature of the present invention and the advantage one of at least, described BLU comprises light source, at least one reflector plate and light diffusing sheet, described light diffusing sheet has basic unit and at least one coating in described basic unit, described basic unit has the base resin potpourri of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2ppwb～about 20ppwb, and described coating has copolymer of methyl methacrylatestyrene subcoat resin, second light diffusing agent of about 0.1ppwb～about 30ppwb, the UV absorbing agent of about 0.01ppwb～about 2ppwb and the antistatic agent of about 0.001ppwb～about 10ppwb.
By provide display device also can realize in above-mentioned and further feature of the present invention and the advantage one of at least, described display device comprises display panel and has the BLU of light source, described BLU has light diffusing sheet, described light diffusing sheet has basic unit and at least one coating in described basic unit, described basic unit comprises the base resin potpourri of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2ppwb～about 20ppwb, and described coating comprises copolymer of methyl methacrylatestyrene subcoat resin, second light diffusing agent of about 0.1ppwb～about 30ppwb, the UV absorbing agent of about 0.01ppwb～about 2ppwb and the antistatic agent of about 0.001ppwb～about 10ppwb.This display device can be a LCD.
Description of drawings
By being described in detail with reference to the attached drawings typical embodiments of the present invention, for a person skilled in the art, above-mentioned and further feature of the present invention and other advantage will become more obvious, wherein:
Fig. 1 illustrates the skeleton view of light diffusing sheet according to embodiments of the present invention;
Fig. 2 illustrates the skeleton view of light diffusing sheet according to another embodiment of the invention; And
Fig. 3 A～3B illustrates the cross sectional representation of the back lighting device with the light diffusing sheet in Fig. 1～2 respectively.
Fig. 4 A～4B illustrates the decomposition diagram of the display device with the light diffusing sheet in Fig. 1～2 respectively.
Fig. 5 is the figure of sag test result of the embodiment of the invention 1 and comparative example's 1～3 sample.
Specific embodiments
Submit to and Korean Patent office and the korean patent application No.10-2006-0064065 of " light diffusing sheet that is used for the LCD back lighting device " by name and the full content of 10-2006-0122521 are incorporated this paper by reference on July 7th, 2006 and on Dec 5th, 2006 respectively.
Describe the present invention hereinafter with reference to the accompanying drawings more comprehensively, for example understand typical embodiments of the present invention in the accompanying drawings.Yet, can different forms implement the present invention, and the present invention should be interpreted as limiting embodiment set forth herein.On the contrary, provide these embodiments, and scope of the present invention is conveyed to those skilled in the art all sidedly so that the disclosure of invention is comprehensive and complete.
In the drawings, clear in order to illustrate, may enlargement layer and regional size.Should also be understood that when mention layer or element another layer or substrate it " on " time, be meant this layer or element can be directly on described other layer or substrate, or also can have the middle layer.In addition, should be appreciated that, when mentioning the D score of layer, be meant that this layer can be directly under described another layer, or also can have one or more middle layers at another layer.In addition, should also be understood that when mention layer in addition two-layer " between " time, can be meant only have this layer described other two-layer between, or also can have one or more middle layers.Same in the text Reference numeral is represented same element.
Below will be with regard to the more detailed description in Fig. 1～2 according to the embodiment that is used for the light diffusing sheet of display panel such as LCD (LCD) of the present invention.As shown in Figure 1, light diffusing sheet 20 can comprise at least one coating 210 in basic unit 200 and the basic unit 200.
When being applied to display device (not shown), the basic unit 200 of light diffusing sheet 20 can be used as the support plinth of light diffusing sheet 20, and can have the thickness of about 100 μ m～about 10000 μ m, i.e. the distance of measuring along the y axle.Basic unit 200 can comprise the light diffusing agent of about 0.2ppwb～about 20ppwb of the base resin potpourri of about 100 weight portions and the about 1 μ m of mean diameter～about 20 μ m.In this respect, it is noted that with respect to the weight of the subcoat resin of the base resin potpourri of basic unit 200 or coating 210 and represent the weight component that promptly weight is counted " weight portion of the base resin of per 100 weight portions " or " ppwb ".More specifically, represent weight component with respect to the base resin potpourri of basic unit 200 in the basic unit 200 of " ppwb ".Represent weight component in the coating 210 of " ppwb " with respect to the subcoat resin of coating 210, this will detailed below discussion.
More specifically, basic unit 200 can comprise the base resin potpourri with methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene.Can pass through mixed methyl acrylic styrene copolymer and copolymer of methyl methacrylatestyrenes such as for example emulsion polymerization of suitable technique, suspension polymerization, solution polymerization, bulk polymerization.
Methacrylate-styrol copolymer can comprise about methacrylate monomers of 2%～about 20% (by weight) and about styrene monomer of 80%～about 98% (by weight).Preferably, methacrylate-styrol copolymer can comprise about methacrylate monomers of 5%～about 10% (by weight) and about styrene monomer of 90%～about 95% (by weight).Based on polystyrene standard, methacrylate-styrol copolymer can have about mean molecular weight of 200000～about 350000.
Copolymer of methyl methacrylatestyrene can comprise about methyl methacrylate monomer of 6%～about 94% (by weight) and about styrene monomer of 6%～about 94% (by weight).Preferably, copolymer of methyl methacrylatestyrene can comprise about methyl methacrylate monomer of 20%～about 80% (by weight) and about styrene monomer of 20%～about 80% (by weight).Based on polystyrene standard, methacrylate-styrol copolymer can have about mean molecular weight of 70000～about 300000.
The light diffusing agent of basic unit 200 can comprise organic granular or the inorganic particle that is dispersed in the base resin potpourri, and wherein organic granular for example has siloxane, fluorinated polymer such as teflon
, acrylic acid and/or styrene, inorganic particle for example has lime carbonate, barium sulphate, titania, aluminium hydroxide, silicon dioxide, glass, talcum, mica, white carbon, magnesium oxide and/or zinc paste, and described light diffusing agent can show and be about 0.02～0.13 refringence with respect to the base resin potpourri.
In force, light diffusing agent can comprise the acrylate component of about 0.1ppwb～about 10ppwb of the silicone components of about 0.1ppwb～about 10ppwb of the about 1 μ m of mean diameter～about 20 μ m and the about 1 μ m of mean diameter～about 20 μ m.The example of silicone components can comprise the crosslinking silicone resin with spherical cross-linked particles.This crosslinking silicone resin can comprise: at room temperature exist silicones for example to have the silicon rubber of low crosslinking degree and good flow performance and the silicones with high-crosslinking-degree and hardness with solid form; The polydialkysiloxane resin is dimethyl silicone polymer and poly-di-ethyl siloxane for example; And the silicones with tridimensional network for example contains the siloxane of epoxy-capped part etc.Do not want to be bound by theory, believe and use the crosslinking silicone resin can give light diffusing agent good against weather, make to show obvious minimizing flavescence when light diffusing agent is exposed to light source for a long time.
Compare with other organic crosslinked component, silicone components can have low relatively refractive index.More specifically, silicone components can have about refractive index of 1.40～about 1.43.Therefore, do not wish to be bound by theory, compare, can give light diffusing sheet 20 enough light diffusing and transmittance yet even believe a spot of silicone components with other crosslinked organic resin.
The acrylate component example that is used for the light diffusing agent of basic unit 200 can comprise acrylic acid monofunctional monomer for example alkyl acrylate such as ethyl acrylate, methyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate; Alkyl methacrylate is Jia Jibingxisuanyizhi, methyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate for example; Similar monomer and their combinations.Acrylate component can comprise spherical cross-linked particles, and can have about refractive index of 1.46～about 1.56.In this respect, it should be noted that can utilize acrylate or methacrylate-styrol copolymer to adjust the refractive index of acrylate component, the number that promptly increases phenyl or halogen group can increase refractive index.
The basic unit 200 of light diffusing agent sheet 20 also can comprise the elasticity of impact modifier with enhancing basic unit 200, for example gives high impact resistance and big bending stifiness.Described impact modifier can comprise elastic body for example acrylic rubber, methacrylic rubber, butadiene rubber etc.
As shown in Figure 1, can form described at least one coating 210 of light diffusing sheet 20 in basic unit 200, its thickness is about 10 μ m～about 1000 μ m.The coating 210 of light diffusing sheet 20 can comprise the light diffusing agent of about 0.1ppwb～about 30ppwb of the about 1 μ m of subcoat resin, the mean diameter of 100 weight portions～about 50 μ m, ultraviolet (UV) absorbing agent (by weight) of about 0.01ppwb～about 2ppwb and the antistatic agent (by weight) of about 0.001～about 10ppwb.The subcoat resin of coating 210 can be different from the base resin potpourri of basic unit 200.Particularly, the subcoat resin of coating 210 can comprise copolymer of methyl methacrylatestyrene.The copolymer of methyl methacrylatestyrene of the subcoat resin of coating 210 can be similar to the copolymer of methyl methacrylatestyrene of the base resin potpourri of basic unit 200 substantially, and for example copolymer of methyl methacrylatestyrene can comprise about methyl methacrylate monomer of 6%～about 94% (by weight) and about styrene monomer of 6%～about 94% (by weight).
The light diffusing agent of coating 210 can comprise acrylate component, silicone components or its combination.In force, the acrylic acid of the light diffusing agent of coating 210 and/or the composition of silicone components can be similar to above-mentioned about the acrylic acid of basic unit 200 and/or the composition of silicone components substantially, and therefore, at this not at the detailed composition that repeats them.The mean diameter of the acrylate component of coating 210 can be different with the mean diameter of the acrylate component of basement membrane 200, although their refractive index can be identical.Do not wish to be bound by theory, believe light diffusing agent may command its surperficial whiteness or glossiness of coating 210, the whiteness or the glossiness on the erose surface of the coating 210 that for example is discussed below, thereby strengthen its aesthetic properties, minimize or prevent transmittance and diffusible deterioration simultaneously.
The UV absorbing agent of coating 210 can protect light diffusing sheet 20 to avoid UV radiation by light emitted.The UV absorbing agent can be any material that can absorb the light of about 250nm～about 280nm wavelength.For example, the UV absorbing agent can be one or more of benzophenone, benzotriazole, cyanoacrylate, salicylate and nickel complex salt.Can in the UV absorbing agent, add light stabilizer, thereby can improve subcoat resin general stability so that free radical wherein minimizes.Light stabilizer for example can be the bulky amine of minimum degradation that can make any component of light diffusing sheet 20.
The antistatic agent of coating 210 can make the space charge in the coating 210 minimize.More specifically, copolymer of methyl methacrylatestyrene can have high relatively resistivity, just, produces static in its surface, thereby gathers and adhere to dust thereon.Dust can make the appearance deterioration of light diffusing agent sheet 20, reduces its luminescence efficiency, and causes the lamp variable color.Therefore, the antistatic agent of coating 210 can make its lip-deep static minimize, thereby reduces the amount of dust above it.Antistatic agent can comprise one or more in ether acid imide acid amides (ether imide amide), polyethers fat, polyethers acyl amine, poly alkylene glycol, dodecylbenzene sulfonic acid alkali metal salt, tertiary amine, quaternary ammonium, sodium chloride and/or the alkyl amine.
Light diffusing agent sheet 20 also can comprise one or more adjuvants.This adjuvant can comprise gas-development agent, plastifier, antioxidant, thermal stabilizer, lubricant, fire retardant, filler, separant, dyestuff, pigment, water-dropping proof agent, nucleator or their combinations.For example, in light diffusing agent sheet 20, use gas-development agent to make because light diffusing agent sheet 20 flavescence that the resin degeneration causes minimize.
Can be by contact the erose surface of formation coatings 210 such as processing as press process, UV resin-coating and processing, through polishing roll.For example, the surface that polishing roll is used in coating 210 forms scrambling, thereby makes by light emitted to the light of the even scattering of the LCD diffuse light of the bright line form dimness that may become for example.The shape on irregularly shaped surface can be depending on brightness of for example distance between the distance between the light source, light diffusing sheet and the light source, light source etc.
Can be by the component of thermoplastic moulded technology mixed light diffusant sheet 20, technology such as for example injection moulding, extrusion molding, vacuum molding, hot-forming, co-extrusion modling.For example, component by mixing each basic unit 200 and coating 210 also is transported to feed draught animals mould (feedblock die) or multitube mouth mould (multi-manifold die) to each potpourri, use polishing roll can implement the multilayer extrusion molding, to form the multilayer layer goods, just, along the y uranium pile folded have a structure of a plurality of layers.For example, the multilayer layer laminate can be the light diffusing agent sheet 20 with double-deck stepped construction.
According to another embodiment of the invention, except that having a plurality of coatings 210, light diffusing agent sheet 21 can be similar to light diffusing agent sheet 20.For example, as shown in Figure 2, can be on the apparent surface of basic unit 200 stacked coating 210.In other words, can between at least two coatings 210, arrange basic unit 200.In addition, other structure of basic unit 200 and coating 210 also within the scope of the invention.
According to embodiment of the present invention, diffusant can improve thermotolerance, photostability and the optical property of the base resin potpourri of methacrylate-styrol copolymer in the basement membrane 200 and copolymer of methyl methacrylatestyrene, and the spherical siloxane and/or the acrylate component of light diffusing agent can give its good light diffusing and transmissivity simultaneously.In addition, use organic light diffusing agent rather than traditional inorganic light diffusing agent, the light dispersed uniform of enhancing can be provided, thereby the wearing and tearing of production equipment and infringement are minimized and reduce particle adhesion.The composition of coating 210 can make substantially owing to the dust adhesion that is exposed to light and/or the hot flavescence that causes for a long time and cause by static minimizes equally, according to embodiments of the present invention.It should be noted, can only antistatic agent and light stabilizer be attached in the coating 210, thereby reduce production costs.Therefore, utilize display device that light diffusing sheet according to embodiments of the present invention forms for example LCD can show improved indicating characteristic, the production cost of reduction is provided simultaneously.
To better understand the present invention by following embodiment.These embodiment can not be interpreted as and limit the scope of the invention.
Embodiment
Embodiment 1
The production of basic unit: mixed methyl acrylate-styrene (MS) multipolymer and methyl methacrylate-styrene (MMS) multipolymer are to form the base resin potpourri of 100 weight portions.With mean diameter be 2 μ m, the amount for the silicon resin particle of 2ppwb (from GE Toshiba Silicone Co., Ltd. obtain) and mean diameter be that 8 μ m, amount join in this base resin potpourri with the formation substrate combination for the acrylic acid cross-linked particles of 2ppwb (from SekisuiChemical Co., the Ltd. acquisition).
The production of coating: prepare the MS multipolymer to form the subcoat resin of 100 weight portions.With mean diameter be 20 μ m, amount for the acrylic acid cross-linked particles of 10ppwb (from Sekisui ChemicalCo., Ltd obtain), amount for the antistatic agent of 1ppwb with measure to the light stabilizer of 1ppwb and join this subcoat resin with the formation coating composition.
The production of multilayer light diffusing sheet: each substrate combination and coating composition are injected in the extruder, then fusion and milling.Then, each substrate combination and coating composition are injected in the feed draught animals mould so that they roll mutually, thereby form the multilayer light diffusing sheet, this multilayer light diffusing sheet has three stack structures layer by layer that have basic unit in the middle of two coatings.The thickness of measuring each coating is 100 μ m.The thickness of measuring basic unit is 1800 μ m.
The comparative example 1:Except that using polystyrene (PS) resin (obtaining) as the subcoat resin, according to the process production multilayer light diffusing sheet of embodiment 1 from PS Japan Corp..
The comparative example 2:Except that using polymethylmethacrylate (PMMA) resin (obtaining) as the base resin, according to comparative example 1 process production multilayer light diffusing sheet from MitsubishiRayon Corp..
The comparative example 3:Except that using PS resin (obtaining) as the base resin, according to comparative example 1 process production multilayer light diffusing sheet from PS Japan Corp..
Each the basic unit's potpourri among embodiment 1 and the comparative example 1～3 and the composition of subcoat in following table, have been summed up.
Table 1-sample is formed
Estimate the sag and the optical property of each multilayer light diffusing sheet that forms among embodiment 1 and the comparative example 1～3.In each test, prepare the sample that each multilayer light diffusing sheet is of a size of 50mm * 30mm * 2mm.Fix a limit of each sample.
The following sag of carrying out is tested.Measure the distance of each sample, just with respect to the height on ground with respect to reference point.Sample was placed in 110 ℃ of stoves one hour.Then, measure each sample once more with respect to same base distance on schedule sag just, in millimeter.The difference of twice measured value is promptly because in vertical direction sagging of heat effect sample is designated as the sag value.The sag value is important to the thermotolerance of measuring multipolymer.
The following evaluation of carrying out optical property.Make each sample under 60 ℃, stand the UV radiation 72 hours of ATLAS-UVCON radiator and estimate the variation of yellow colour index (YI), promptly according to the ASTMD1925 program, measure before the UV radiation and afterwards Δ YI according to white coordinate (white color coordinates), and measure less Δ YI value as higher sunproof indication.Use nephelometer
From Nippon Denshoku Industries Co., Ltd. obtains) estimate each sample value to measure transmittance and light scattering rate (scatterability).Each sample is attached to 32 inches backlight, with the brightness backlight of BM-7 YC instrumentation amount.
The test result of having represented sag among Fig. 5.
As shown in Figure 5, test result is: the sample sag value of embodiment 1 is 1mm, comparative example 1 is 10mm, comparative example 2 is 6mm, comparative example 3 is 13mm or bigger, the resin of embodiment 1 comprises that promptly the base resin potpourri of MS and MMS potpourri has demonstrated the most excellent sag result, and promptly the sag value is 1mm.In other words, the sample among the embodiment 1 demonstrates the minimum change for the heat that applies, and therefore shows excellent thermotolerance.
Represented the optic test result in the table 2.
Table 2-optic test result
| Embodiment 1 | The comparative example 1 | The comparative example 2 | The comparative example 3 | |
| Photostability (Δ YI) | 8 | 11 | 5 | 15 |
| Transmittance (%) | 51.1 | 52.0 | 62.3 | 53.2 |
| Light scattering rate (%) | 93.1 | 93.0 | 92.9 | 93.1 |
| Brightness (cd/m 2) | 11，120 | 11，110 | 11，141 | 11，124 |
As shown in table 2, to compare with 3 with comparative example 1, the resin among the embodiment 1 comprises that promptly the base resin potpourri of MS and MMS potpourri demonstrates excellent anti-UV, demonstrates transmittance, light diffusing and the brightness value suitable with comparative example 1～3 simultaneously.
Shown in Fig. 4 A～4B, light diffusing sheet can be used in the display device according to embodiments of the present invention.More specifically, shown in Fig. 3 A～3B, utilize suitable method can construct back lighting device 40 or the back lighting device 41 of LCD (not shown), this back lighting device 40 and back lighting device 41 can comprise at least one light source 100, reflector plate 110 and light diffusing sheet 20 and 21 respectively.Therefore, shown in Fig. 4 A～4B, back lighting device 40 and 41 can be respectively applied for LCDs400 and 410.
Because the amorphous embossed pattern on the light diffusing sheet, have according to embodiments of the present invention that the BLU of light diffusing sheet can have improved transmittance and light diffusing, therefore enhanced brightness is provided.Therefore, because the use and the sandwich construction of MS/MMS resin compound, having according to embodiments of the present invention, the BLU of light diffusing sheet can demonstrate excellent photostability and against weather.At last, compare, have low relatively wearing and tearing and infringement that the BLU of light diffusing sheet according to embodiments of the present invention also can demonstrate production equipment with traditional BLU.
In this article, having disclosed typical embodiments of the present invention, although used particular term, only is to use and explain these terms rather than in order to limit purpose on general and descriptive sense.Therefore, it should be appreciated by those skilled in the art that under the situation of the spirit and scope of the invention that does not deviate from the claims to be set forth, can carry out changing on various forms and the details.
Claims (21)
1. light diffusing sheet that is used for display device comprises:
Basic unit, described basic unit comprise the base resin potpourri of 100 parts by weight of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2 weight portion～about 20 weight portions; With
At least one coating in described basic unit, described coating comprise the copolymer of methyl methacrylatestyrene subcoat resin of 100 weight portions, second light diffusing agent of about 0.1 weight portion～about 30 weight portions, the UV absorbing agent of about 0.01 weight portion～about 2 weight portions and the antistatic agent of about 0.001 weight portion～about 10 weight portions.
2. light diffusing sheet according to claim 1, the methacrylate-styrol copolymer of wherein said basic unit comprise about methacrylate monomers of 2%～about 20% (weight) and about styrene monomer of 80%～about 98% (weight).
3. light diffusing sheet according to claim 1, the copolymer of methyl methacrylatestyrene of wherein said basic unit comprise about methyl methacrylate monomer of 6%～about 94% (weight) and about styrene monomer of 6%～about 94% (weight).
4. light diffusing sheet according to claim 1, first light diffusing agent of wherein said basic unit comprise the acrylate component of the about 1 μ m of the mean diameter of about 0.1 weight portion～about 10 weight portions～silicone components of about 20 μ m and the about 1 μ m of the mean diameter of about 0.1 weight portion～about 10 weight portions～about 20 μ m.
5. light diffusing sheet according to claim 1, second light diffusing agent of wherein said coating comprise that mean diameter is that acrylate component or the mean diameter of about 1 μ m～about 50 μ m is the silicone components of about 1 μ m～about 20 μ m, or their combination.
6. light diffusing sheet according to claim 5, second light diffusing agent of wherein said coating comprises silicone components, described silicone components comprises one or more in the silicones with tridimensional network.
7. light diffusing sheet according to claim 5, second light diffusing agent of wherein said coating comprises silicone components, described silicone components comprises one or more in dimethyl silicone polymer and/or the poly-di-ethyl siloxane.
8. light diffusing sheet according to claim 5, the light diffusing agent of wherein said coating comprises acrylate component, and described acrylate component comprises one or more in methyl methacrylate, Jia Jibingxisuanyizhi, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate and/or the benzyl acrylate.
9. light diffusing sheet according to claim 1, wherein said UV absorbing agent absorbs the UV radiation of about 250nm～about 280nm.
10. light diffusing sheet according to claim 1, wherein said UV absorbing agent comprises one or more in benzophenone, benzotriazole, cyanoacrylate and/or the nickel complex salt.
11. light diffusing sheet according to claim 1, wherein said antistatic agent comprise in polyetherimide amine amide, polyether ester, polyether ester amides, poly alkylene glycol, dodecylbenzene sulfonic acid alkali metal salt, tertiary amine, quaternary ammonium, sodium chloride and/or the alkyl amine one or more.
12. light diffusing sheet according to claim 1, wherein said basic unit has the thickness of about 100 μ m～about 10000 μ m.
13. light diffusing sheet according to claim 1, wherein said coating have the thickness of about 10 μ m～about 1000 μ m.
14. light diffusing sheet according to claim 1, wherein said coating comprises embossed pattern.
15. light diffusing sheet according to claim 14, wherein said embossed pattern are unbodied and have the surfaceness of about 0.1 μ m～about 20 μ m.
16. light diffusing sheet according to claim 1, wherein said coating also comprises light stabilizer.
17. light diffusing sheet according to claim 1, wherein said light diffusing sheet comprise two coatings.
18. light diffusing sheet according to claim 17, wherein said basic unit is between described two coatings.
19. a back lighting device comprises:
Light source;
At least one reflector plate; With
Light diffusing sheet, described light diffusing sheet comprises basic unit and at least one coating in described basic unit, described basic unit has the base resin potpourri of 100 parts by weight of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2 weight portion～about 20 weight portions, and described coating comprises the copolymer of methyl methacrylatestyrene subcoat resin of 100 weight portions, second light diffusing agent of about 0.1 weight portion～about 30 weight portions, the antistatic agent of the UV absorbing agent of about 0.01 weight portion～about 2 weight portions and about 0.001 weight portion～about 10 weight portions.
20. a display device comprises:
Display panel; With
Back lighting device with light source, described back lighting device comprises light diffusing sheet, described light diffusing sheet has basic unit and at least one coating in described basic unit, described basic unit has the base resin potpourri of 100 parts by weight of methacrylate-styrol copolymer and copolymer of methyl methacrylatestyrene and first light diffusing agent of about 0.2 weight portion～about 20 weight portions, and described coating comprises 100 parts by weight of methylmethacrylate-styrol copolymer subcoat resin, second light diffusing agent of about 0.1 weight portion～about 30 weight portions, the antistatic agent of the UV absorbing agent of about 0.01 weight portion～about 2 weight portions and about 0.001 weight portion～about 10 weight portions.
21. display device according to claim 20, wherein said display device is a LCD.
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| KR1020060064065 | 2006-07-07 | ||
| KR20060064065 | 2006-07-07 | ||
| KR1020060122521 | 2006-12-05 |
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| KR (1) | KR100893520B1 (en) |
| CN (1) | CN100538407C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101035872B1 (en) * | 2008-12-18 | 2011-05-19 | 제일모직주식회사 | Multi-layered light diffuser plate with excellent impact resistance and crack, back light unit and LCD using the light diffuser plate |
| KR101127106B1 (en) * | 2009-12-30 | 2012-04-30 | 제일모직주식회사 | Light diffuser used in liquid crystal display device |
| CN102337016A (en) * | 2011-07-27 | 2012-02-01 | 安徽集虹材料科技有限公司 | Preparation method of light-diffusion master batch |
| TWI515490B (en) * | 2013-09-25 | 2016-01-01 | 友達光電股份有限公司 | Display device |
| CN104109384A (en) * | 2014-06-27 | 2014-10-22 | 惠州市昌亿新材料有限公司 | Light-diffusing agent for polycarbonate and light-diffusing polycarbonate material |
| CN104109385B (en) * | 2014-06-27 | 2017-10-17 | 广东昌亿新材料有限公司 | A kind of PMMA light diffusing agents and a kind of light spread PMMA materials |
| KR101941210B1 (en) | 2016-08-12 | 2019-01-22 | 세원정공 주식회사 | Multi-layer expandable light diffusion sheet and manufacturing method thereof |
| KR102117519B1 (en) | 2019-08-09 | 2020-06-01 | 하현대 | Light-diffusion and anti-glare properties-integrated two-layer sheet and method for manufacturing the same |
| KR102125497B1 (en) | 2019-08-09 | 2020-06-22 | 하현대 | Light-diffusion and anti-glare properties-integrated monolayer sheet and method for manufacturing the same |
| CN113913008B (en) * | 2021-11-15 | 2022-06-24 | 聊城鲁西聚碳酸酯有限公司 | Light diffusant and flame-retardant light diffusion polycarbonate composition and preparation method thereof |
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| JP3669299B2 (en) | 2001-07-12 | 2005-07-06 | 住友化学株式会社 | Methyl methacrylate resin composition and molded article thereof |
| KR100641841B1 (en) * | 2004-09-02 | 2006-11-02 | 제일모직주식회사 | Multi-layered Light Diffuser developed warpage and Liquid Crystal Display Using the Same |
| KR100593470B1 (en) * | 2004-11-01 | 2006-06-28 | 제일모직주식회사 | Liquid crystal display device comprising a light diffusion plate and a light diffusion plate |
| KR100793179B1 (en) * | 2005-02-01 | 2008-01-10 | 주식회사 코오롱 | Light-diffusion plate |
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2006
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| KR20080005048A (en) | 2008-01-10 |
| CN101109829A (en) | 2008-01-23 |
| TW200804872A (en) | 2008-01-16 |
| TWI345081B (en) | 2011-07-11 |
| KR100893520B1 (en) | 2009-04-17 |
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