CN103913782A - Optical sheet and backlight unit - Google Patents
Optical sheet and backlight unit Download PDFInfo
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- CN103913782A CN103913782A CN201310741117.0A CN201310741117A CN103913782A CN 103913782 A CN103913782 A CN 103913782A CN 201310741117 A CN201310741117 A CN 201310741117A CN 103913782 A CN103913782 A CN 103913782A
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- pearl
- acrylate
- methyl
- light
- liquid crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
- Laminated Bodies (AREA)
- Liquid Crystal (AREA)
Abstract
The invention aims to provide an optical sheet and a backlight unit, which can fully prevent light guide plate arranged on the back side of a light diffusion sheet or other members from being damaged. The optical sheet is a light diffusion sheet, and the back light unit uses the light diffusion sheet. The light diffusion sheet includes a transparent substrate layer, and a bonding prevention layer laminated on the back side of the substrate layer and including a bead and an adhesive covering the bead, the bead mainly comprising polyamide resin and the adhesive comprising a resin composition taking ultraviolet curing resin as main polymer. Preferably, the hardness D of the sclerometer of the bead is more than 30 and less than 70. Preferably, the pencil hardness of the back side of the adhesive is more than H and less than 2H. Preferably, the average covering film thickness of the adhesive at the top of the back side is more than 0.1 mum and less than 3 mum.
Description
Technical field
The present invention relates to optical sheet and back light unit.
Background technology
As transmissive liquid crystal display device, popularized from the transmissive liquid crystal display device of the mode backlight of back side illuminaton liquid crystal layer, the lower face side of liquid crystal layer be provided with edge-light type (side light type), under the back light unit such as type.As shown in Fig. 3 (a), the back light unit 40 of described edge-light type generally comprises: light source 41; Light guide plate 42, for square tabular, configures along the mode of described light source 41 with end; Multiple optical sheets 43, overlay configuration is in the face side of described light guide plate 42.Described optical sheet 43 has the function that makes transmitted ray diffusion, refraction etc., and use (1) is configured in the face side of light guide plate 42, mainly has the light diffusing sheet 44 of light diffusion function; And (2) be configured in the face side of light diffusing sheet 44, have and make light to the prismatic lens 45 of the function of normal direction side refraction etc.
Function to described back light unit 40 describes, and the light that first incides light guide plate 42 from light source 41, by the reflection spot at light guide plate 42 back sides or reflector plate (omitting figure) and each offside reflection, penetrates from light guide plate 42 surfaces.The light penetrating from light guide plate 42 incides light diffusing sheet 44, after being diffused, penetrates from surface.The light penetrating from light diffusing sheet 44 surfaces incides prismatic lens 45, is reflected and penetrates, and then the whole face that there is no the liquid crystal layer representing in the figure of top is thrown light on by the prism portion that is formed on surperficial multiple outstanding bar shaped to normal direction side.
Described light diffusing sheet 44 substantially disperses transmitted ray equably, the object that uses it be utilize its light diffusing can make brightness evenly, make the brightness raising of frontal etc.As shown in Fig. 3 (b), as described light diffusing sheet 44, comprise plastic substrate layer 46, be layered in the surperficial light diffusion layer 47 of described substrate layer 46 and be layered in the adhesion preventing layer 48 at the back side of substrate layer 46.Described adhesion preventing layer 48 prevents the back side of light diffusing sheet 44 and the surface adhesion (being adjacent to) of light guide plate 42 and produces the such rough sledding of interference fringe.Described adhesion preventing layer 48 conventionally has spherical bead and covers the bonding agent of heat-curing resin system of described pearl, prevent from resulting from pearl, to the back side side-prominent protuberance and light guide plate adhesion.
Conventionally use acrylic acid pearl as the pearl 50(of described adhesion preventing layer 48 with reference to No. 2011-126274, Japanese Patent Publication communique JP)., because acrylic acid pearl quality is harder, so damage is caused on the surface of sometimes understanding the light guide plate 42 of the rear side to being layered in light diffusing sheet 44 because of the outstanding pearl 50 in the back side to bonding agent 49.Like this, if light guide plate 42 is damaged, produce sometimes the rough sledding such as brightness disproportionation because of described damage.
Prior art document
Patent documentation 1: No. 2011-126274, Japanese Patent Publication communique JP
To prevent that described rough sledding is as aim, propose to make pearl, bonding agent etc. to form the technology of the material character softness that adheres to preventing layer., even if distinguished the pearl etc. that uses described character softness, also can cause damage to the surface of light guide plate.The inventor has carried out wholwe-hearted research to its reason, think if at other the optical sheet such as the face side configuration prismatic lens of light diffusing sheet, because causing, the load of the optical sheet of described face side results from the protuberance of pearl by conquassation, particularly the leading section (top of rear side) of contact portion in the spherical form of described soft pearl, that conduct contacts with light guide plate is easily out of shape, therefore, become large with the contact area of the light guide plate that is layered in rear side, and then friction force change is large, can increase on the contrary damage.In addition, think because described friction force causes peeling off as the coverlay of the bonding agent of the face in the outside of the pearl of the contact portion contacting with light guide plate, because the stripping film of described bonding agent also can cause the damage of light guide plate.
Summary of the invention
In view of described problem, the object of this invention is to provide a kind of can give full play to prevent the optical component to being configured in light diffusing sheet rear side cause damage function liquid crystal display optical sheet and used the back light unit of described liquid crystal display optical sheet.
In order to solve described problem, the inventor has carried out wholwe-hearted research, finds that the bonding agent stipulating by use fixedly has the pearl of suitable stiffness, can give full play to the function that prevents the optical component of rear side to cause damage.
That is, in order to solve described problem, the invention provides a kind of liquid crystal display optical sheet, it comprises: transparent substrate layer; And adhesion preventing layer, be layered in the rear side of described substrate layer, the bonding agent that contains pearl and the described pearl of covering, the principal ingredient of described pearl is polyamide-based resin, described bonding agent is made up of resin combination, and described resin combination is using ultraviolet curing resin as main polymer.
This liquid crystal display optical sheet is by using the softer polyamide-based resinous pearl of quality, as forming the pearl that adheres to preventing layer, and to make bonding agent be the harder ultraviolet curing resin system of quality, thereby the binder film that becomes hard covers soft pearl.Therefore, even if External Force Acting is in resulting from the protuberance of pearl, this liquid crystal display optical sheet also can suppress in the past such only makes leading section (top of rear side) by conquassation, and protuberance becomes flat mode with entirety and is out of shape,, protuberance becomes oval-shaped mode with section and is out of shape.Its result, even if the effect of this liquid crystal display optical sheet has external force, contact area to be also difficult to increase, and then friction force is also difficult to increase, and can significantly improve the effect that prevents other optical components of rear side to cause damage.
Preferably, the scleroscopic D hardness of described pearl is more than 30 below 70.By making the scleroscopic D hardness of pearl in described scope, can further improve the effect that prevents the optical component of rear side to cause damage.
Preferably, the pencil hardness at the back side of described bonding agent is below the above 2H of H.By making described pencil hardness in described scope, the bonding agent contacting with the optical component of rear side has suitable hardness, so when the coverlay of face outside the pearl of bonding agent and the optical component of rear side contact, can suppress reliably described bonding agent the optical component of rear side is caused to damage.
Preferably, the average covering thickness of the bonding agent at the top of the rear side of described pearl is below the above 3 μ m of 0.1 μ m.By making the thickness of coverlay of described bonding agent in described scope, can make this liquid crystal display optical sheet meet the requirement of slimming, and can prevent from reliably preventing that because causing the coverlay of bonding agent to peel off with the friction of the optical component of rear side, can realize to improve stripping film from causing the function of damage to the optical component of rear side.
Preferably, the mean grain size of described pearl is below the above 20 μ m of 2 μ m.By making the mean grain size of pearl in described scope, can make this liquid crystal display optical sheet meet the requirement of slimming, effectively realize and prevent that the optical component of rear side from sustaining damage, and can give full play to the function that prevents adhesion.
In order to solve described problem, the back light unit that the present invention also provides a kind of liquid crystal indicator to use, it possesses described liquid crystal display optical sheet.Thus, can improve rightly the optical component preventing described light diffusing sheet rear side and cause damage.
In addition, in the present invention, so-called face side refers to the side of the people who watches in the time being assembled on liquid crystal indicator, and so-called rear side refers to a side contrary with face side.Mean grain size refers to the mean value from multiplying power being the particle diameter of random 30 particles extracting out in the particle of observing the electron microscope of 1000 times, and particle diameter is to be defined by Feret's diameter (interval while clamping projected image with the parallel lines of certain orientation).Pencil hardness is the pencil cut value obtaining according to the test method of JIS K5400 8.4, is the value measuring in the region that there is no pearl.Scleroscopic D hardness is the value measuring according to JIS K7215.The average thickness of the coverlay of the so-called bonding agent that covers nylon beads is the section with this light diffusing sheet of electron microscope observation, from the thickness selected at random, cover the coverlay of the bonding agent at 10 positions of nylon beads (from the interface of the nylon beads distance to outside surface) mean value calculation out.
Cross as mentioned above, liquid crystal display optical sheet of the present invention and the back light unit that possesses described liquid crystal display optical sheet, can give full play to and prevent that the optical component of the rear side to liquid crystal display optical sheet from causing the function of damage.
Accompanying drawing explanation
Fig. 1 is the cut-open view that schematically shows the light diffusing sheet of one embodiment of the present invention.
Fig. 2 is the partial enlarged drawing of the light diffusing sheet of Fig. 1.
(a) of Fig. 3 is the stereographic map that schematically shows common edge-light type back light unit, and (b) of Fig. 3 is the cut-open view that schematically shows common light diffusing sheet.
Description of reference numerals
1 light diffusing sheet
2 substrate layers
3 light diffusion layers
4 bonding agents
5 light diffusing agents
6 adhere to preventing layer
7 bonding agents
7a coverlay
8 pearls
Embodiment
Below as an embodiment of the invention, be example for the optical sheet of the backboard of liquid crystal indicator, be elaborated with reference to suitable accompanying drawing.
Light diffusing sheet
Light diffusing sheet 1 possesses substrate layer 2 and is layered in the adhesion preventing layer 6 of the rear side of described substrate layer 2.Described light diffusing sheet 1 also possesses the optical functional layer of the face side that is layered in substrate layer 2, and in the present embodiment, optical functional layer is the light diffusion layer making from the light diffusion of light guide plate.
Substrate layer
Substrate layer 2 is by making the transparent synthetic resin that light sees through make.At this, transparent can be also colored transparent, translucent, in order to improve light transmittance, and preferably water white transparency.As the synthetic resin for described substrate layer 2, there is no particular limitation, for example, can enumerate polyethylene terephthalate, PEN, acryl resin, polycarbonate, polystyrene, polyolefin, cellulose acetate, weatherability vinyl chloride etc.Wherein, the polyethylene terephthalate that preferably transparency is excellent, intensity is high, particularly preferably is the improved polyethylene terephthalate of bending property.
Although as the average thickness of substrate layer 2, there is no particular limitation, preferably more than 10 μ m, more preferably more than 35 μ m, further preferably more than 50 μ m.In addition, as described average thickness, preferably below 500 μ m, more preferably below 250 μ m, further preferably below 188 μ m.Be less than described lower limit at the average thickness of described substrate layer 2, exist curling problem occurs in the time being coated with the formation material of light diffusion layer 3 or adhesion preventing layer 6.Otherwise, in the situation that described average thickness exceedes the described upper limit, cause sometimes the brightness of liquid crystal indicator to reduce, in addition, thereby can cause the thickness of back light unit to become greatly against in the requirement to liquid crystal indicator slimming.
Optical functional layer
Be layered in the surface of substrate layer 2 as the light diffusion layer 3 of optical functional layer, form described light diffusion layer 3 by the coating fluid that contains light diffusing agent 5 and bonding agent 4 at the surface-coated of substrate layer 2.Described light diffusion layer 3 has bonding agent 4 and is contained in the light diffusing agent 5 in described bonding agent 4.In light diffusion layer 3, contain as described above light diffusing agent 5, can make evenly to spread from rear side to face side transmitted through the light of light diffusion layer 3.In addition, be substantially formed uniformly on the surface of light diffusion layer 3 by light diffusing agent 5 fine concavo-convex.Like this, the refraction action of the fine concavo-convex lens that form by the surface at light diffusing sheet 1, can make light spread better.
Light diffusing agent 5 is the particles with the character that makes light diffusion, is mainly divided into inorganic filler and organic filling material.Specifically, as inorganic filler, can use silicon dioxide, aluminium hydroxide, aluminium oxide, zinc paste, barium sulphide, magnesium silicate or their potpourri.As the concrete material of organic filling material, can use acryl resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyamide, polyacrylonitrile etc.Wherein, preferably transparent high acryl resin, particularly preferably is polymethylmethacrylate (PMMA).
There is no particular limitation for the shape of light diffusing agent 5, for example, can enumerate spherical, cubic, needle-like, bar-shaped, spindle shape, tabular, flakey, fibrous etc., wherein, and the spherical pearl that preferably light diffusing can be excellent.
Although there is no particular limitation for the mean grain size of light diffusing agent 5, as described mean grain size, preferably more than 1 μ m, more preferably more than 2 μ m, further preferably more than 5 μ m.In addition, as described mean grain size, preferably below 50 μ m, more preferably below 20 μ m, further preferably below 15 μ m.If the mean grain size of described light diffusing agent 5 is less than described lower limit, concavo-convex the diminishing on light diffusion layer 3 surfaces that formed by light diffusing agent 5, existence can not meet the problem as the needed light diffusing energy of light diffusing sheet 1.On the contrary, if described mean grain size exceedes the described upper limit, the thickness of light diffusing sheet 1 increases, and diffusion uniformly can become difficulty in addition.
Although there is no particular limitation for the content of light diffusing agent 5, but the content as light diffusing agent 5 with respect to the resinous principle of the bonding agent 4 of 100 mass parts, preferably more than 10 mass parts, more preferably more than 20 mass parts, further preferably more than 50 mass parts.In addition, as described content, preferably below 500 mass parts, more preferably below 300 mass parts, further preferably below 200 mass parts.Be less than described lower limit at the content of light diffusing agent 5, have the inadequate problem of light diffusing energy.On the contrary, if the content of light diffusing agent 5 exceedes the described upper limit, the effect of fixed light diffusant 5 reduces.In addition, in the case of being with light diffusing sheet, because do not need high light diffusing energy, so as the content of light diffusing agent 5 in the what is called of face side configuration of prismatic lens, preferably below above 40 mass parts of 10 mass parts, more preferably below above 30 mass parts of 20 mass parts.
Solidify (crosslinked etc.) by the polymer composition that makes to contain substrate polymer and form bonding agent 4.By described bonding agent 4, light diffusing agent 5 is configured to isodensity to the whole surface that is fixed on substrate layer 2 substantially.In addition, be used to form and such as in the polymer composition of described bonding agent 4, also can suitably allocate small inorganic filler, hardening agent, plastifier, spreading agent, various levelling agent, antistatic agent, ultraviolet light absorber, antioxidant, viscosity modifying agent, lubricant, Photostabilised dose etc. into.
As described substrate polymer, there is no particular limitation, for example can enumerate acrylic resin, polyurethane, polyester, fluorine resin, silicon is resin, polyamide-imides, epoxy resin, ultraviolet curing resin etc., one kind or two or more described polymer mixed can be used.Particularly as described substrate polymer, preferably good processability, can easily form the polyvalent alcohol of described light diffusing sheet 1 by methods such as coatings.In addition, from improving the viewpoint of light transmission, preferably transparent for the substrate polymer of bonding agent 4 itself, particularly preferably be water white.
As described polyvalent alcohol, can exemplify polyvalent alcohol, the polyester polyol obtaining etc. that the monomer component polymerization that comprises hydroxyl unsaturated monomer is obtained under the condition of hydroxyl surplus, can use single described polyvalent alcohol, also described polyvalent alcohol of more than two kinds can be mixed and uses.
As hydroxyl unsaturated monomer, can enumerate: (a) the hydroxyl unsaturated monomer such as such as acrylic acid 2-hydroxyl ethyl ester, acrylic acid 2-hydroxypropyl acrylate, HEMA, methacrylic acid 2-hydroxypropyl acrylate, allyl alcohol, homoallylic alcohol, styron, crotonyl alcohol; (b) by such as ethylene glycol, oxirane, propylene glycol, epoxypropane, butylene glycol, epoxy butane, Isosorbide-5-Nitrae-bis-(methylol) thiacyclohexane, phenyl glycidyl ether, capric acid ethylene oxidic ester, プ ラ Network セ Le FM-1(Daisel chemical industry Co., Ltd system) etc. dibasic alcohol or epoxy compound react hydroxyl unsaturated monomer obtaining etc. with unsaturated carboxylic acids such as such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acids.Can manufacture polyvalent alcohol by the one kind or two or more polymerization that the hydroxyl unsaturated monomer from described is selected.
In addition, also can be from ethyl acrylate, acrylic acid n-propyl, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, EHA, β-dimethyl-aminoethylmethacrylate, n propyl methacrylate, isopropyl methacrylate, n-BMA, Tert-butyl Methacrylate, ethylhexyl methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, styrene, vinyltoluene, 1-methyl styrene, acrylic acid, methacrylic acid, vinyl cyanide, vinyl acetate, propionate, stearic acid vinyl ester, allyl acetate, diallyl adipate, itaconic acid diallyl, diethyl maleate, polyvinyl chloride, vinylidene chloride, acrylamide, N hydroxymethyl acrylamide, N-butoxymethyl acrylamide, diacetone acrylamide, ethene, propylene, the one kind or two or more ethylene unsaturated monomer of selecting in isoprene etc. is manufactured polyvalent alcohol with the hydroxyl polymerization of unsaturated monomers of selecting from described (a) with (b).
Be more than 1000 below 500000 the number-average molecular weight that comprises the polyvalent alcohol obtaining after the monomer component polymerization of hydroxyl unsaturated monomer, preferably more than 5000 below 100000.In addition, described hydroxyl value is more than 5 below 300, preferably more than 10 below 200, more preferably more than 20 below 150.
Hydroxyl value that can be in the polyvalent alcohols such as propylene glycol, hexanediol, polyglycol, trimethylolpropane make under than the many conditions of the carboxyl number of polyprotonic acid following (c) and (d) reaction be manufactured on the polyester polyol obtaining under the condition of hydroxyl surplus.(c) be for example ethylene glycol, diglycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,5-pentanediol, neopentyl glycol, hexanediol, decanediol, 2,2,4-trimethyl-1, the polyvalent alcohols such as 3-pentanediol, trimethylolpropane, hexanetriol, glycerine, pentaerythrite, cyclohexanediol, hydrogenated bisphenol A, two (methylol) thiacyclohexane, two (hydroxyethyl ether), three (hydroxyethyl) isocyanates of p-dihydroxy-benzene, benzene dimethanol; (d) be the polyprotonic acids such as such as maleic acid, fumaric acid, succinic acid, hexane diacid, decanedioic acid, azelaic acid, trimellitic acid, terephthalic acid (TPA), phthalic acid, m-phthalic acid.
The number-average molecular weight of the polyester polyol obtaining under the condition of hydroxyl surplus is more than 500 below 300000, preferably more than 2000 below 100000.In addition, its hydroxyl value is more than 5 below 300, preferably more than 10 below 200, more preferably more than 20 below 150.
The polyvalent alcohol using as the substrate polymer of described polymer composition, preferably described polyester polyol and will comprise the acrylic polyol obtaining after the monomer component polymerization of described hydroxyl unsaturated monomer and there is (methyl) acrylic acid unit etc.Using strong as the weatherability of the bonding agent 4 of substrate polymer to polyester polyol or acrylic polyol, can suppress described light diffusing sheet 1 xanthochromia etc.In addition, can use any one party in described polyester polyol and acrylic polyol, also can use both sides.
In addition, hydroxyl number in described polyester polyol and acrylic polyol, if have in each molecule more than 2, there is no particular limitation, if but the hydroxyl value in solid constituent is below 10, the tendency that has the physical property of the coverlays such as number of crosslinks minimizing, solvent resistance, water tolerance, thermotolerance, skin hardness to reduce.
Adhere to preventing layer
Adhere to the back side that preventing layer 6 is layered in substrate layer 2, contain the bonding agent 7 of pearl 8 and covering pearl 8 at the back side of substrate layer 2.Described adhesion preventing layer 6, by using described pearl 8 as rising thereby forming protuberance, prevents that the light guide plate of light diffusing sheet 1 and described rear side from adhering to thus, can suppress the brightness disproportionation of the picture of liquid crystal indicator.In addition, as shown in Figure 1, adhere to preventing layer 6 and there is the described protuberance forming because of the existence of pearl 8 and the par that does not have pearl 8.
The principal ingredient of pearl 8 is polyamide-based resin.As polyamide-based resin, can use fatty polyamide resin, aromatic polyamide resin etc.Wherein, preferably use the suitable fatty polyamide resins such as hardness.As described fatty polyamide resin, can use nylon 6, nylon 66, nylon 68, nylon 46, nylon 612, NYLON610 etc.Pearl 8 also can contain one or more above described polyamide-based resins.In addition, pearl 8 can be also using polyamide-based resin as principal ingredient and contain the polyamide-based resin nylon copolymer of composition in addition, can also be the hybrid resin that contains polyamide-based resin other resins in addition.
There is no particular limitation for the shape of pearl 8, for example, can enumerate spherical, needle-like, bar-shaped, spindle shape, tabular, flakey, fibrous etc., preferably adheres to and prevent excellent spherical such as function.
The scleroscopic D hardness of pearl 8, preferably more than 30, more preferably more than 40.In addition, as described scleroscopic D hardness, preferably below 70, more preferably below 60.Scleroscopic D hardness in the case of described pearl 8 is less than described lower limit, in the time that the optical sheets such as prismatic lens are configured in to the face side of light diffusing sheet 1, has the problem that can cause pearl 8 excessive deformations, bonding agent 7 to peel off from pearl 8 because of the load of described optical sheet.On the contrary, in the situation that described scleroscopic D hardness exceedes the described upper limit, the light guide plate that existence can not fully be prevented the rear side to light diffusing sheet 1 causes the function of damage.
Pearl 8 can be that single dispersion pearl can be also polydispersion pearl.At this, there is no particular limitation for the coefficient of alteration of the particle diameter to pearl 8, is applicable to using the coefficient of alteration of more than 0.05 particle diameter below 1.The lower limit of the coefficient of alteration of the particle diameter of described pearl 8 more preferably 0.1, the upper limit more preferably 0.3.If the coefficient of alteration of the particle diameter of pearl 8 exceedes the described upper limit, existing in fact can be to the problem of the load of outstanding a part of pearl overaction.On the contrary, if described coefficient of alteration is less than described lower limit, there is the problem of the high cost of the pearl using.
Although there is no particular limitation for the mean grain size X of described pearl 8, as described mean grain size X, preferably more than 2 μ m, more preferably more than 3 μ m, further preferably more than 4 μ m.In addition, as described mean grain size X, preferably below 20 μ m, more preferably below 10 μ m, further preferably below 6 μ m.By making the mean grain size X of pearl 8 in described scope, can make this liquid crystal display optical sheet meet slimming requirement, can effectively realize and prevent the optical component of rear side cause damage and can fully realize adhering to and prevent function.
Although there is no particular limitation for the content of pearl 8, with respect to the resinous principle of the bonding agent 7 of 100 mass parts, the content of pearl 8 is preferably more than 0.1 mass parts, more preferably more than 0.3 mass parts, further preferably more than 0.5 mass parts.In addition, as the content of described pearl 8, preferably below 5 mass parts, more preferably below 4 mass parts, further preferably below 3 mass parts.Be less than described lower limit at the content of described pearl 8, exist the pearl 8 that adheres in preventing layer 6 exist ratio very few, can not fully realize and prevent the function that adheres to light guide plate.On the other hand, in the situation that described content exceedes the described upper limit, there is following problems: although adhere to pearl 8 in preventing layer 6 exist ratio become many can not further improve to adhere to prevent function; Because of the function of pearl 8 these light diffusing sheets 1 of obstruction.
Bonding agent 7 is formed by the resin combination using ultraviolet curing resin as main polymer.As described main polymer, there is no particular limitation, can exemplify the radical polymerization syzygy resins such as (a) epoxy acrylate, urethane acrylate, melamine acrylate; (b) polymercaptan-polyenoid of light addition polymerization type is resin; (c) light cationic polymerization type resin etc.Wherein, as described main polymer, preferably ultraviolet hardening acrylic resin.
In addition, in the resin combination using described ultraviolet curing resin as main polymer, light trigger and thinning agent be can allocate into, various solvents for adjusting viscosity, antistatic agent, slip agent, photosensitizer, polymerization inhibitor, antioxidant, spreading agent, surfactant, inorganic filler, inorganic pigment, organic pigment, organic dyestuff, light stabilizer, light absorber, levelling agent, defoamer, rust preventive etc. also can be suitably allocated in addition into.
As the resin combination using ultraviolet curing resin as main polymer, preferably contain: be (a) urethane acrylate that the acrylate compounds of polyvalent alcohol and hydroxyl forms as essential component manufacture using alicyclic isocyanate compound, ester; (b) acrylic ester reactive diluent; And (c) light trigger.
Make alicyclic isocyanate compound, ester be polyvalent alcohol and hydroxyl acrylate compounds 50～120 ℃, have polyurethane-reinforcement catalyzer as required in the situation that, generation polyurethane-reinforcement reacts, and can easily synthesize thus the urethane acrylate of (a).Even if the reaction of described polyurethane-reinforcement is the reaction of putting into whole compositions quickly, but also can by polyol component and isocyanate prepolymer composition after the remaining synthetic prepolymer of the temporary transient mistake of isocyanate group, utilize the acrylate compounds of hydroxyl to make remaining isocyanates radical reaction, also can synthesize.In addition, also can adopt following manner: remaining by after the acrylate compounds of hydroxyl and isocyanate compound synthetic prepolymer in the temporary transient mistake of isocyanate group, remaining isocyanate group is reacted with polyester polyol.As the molecular weight of the synthetic urethane acrylate of the reaction by described, preferably in 700～20000 scope.
As described alicyclic isocyanate compound, can use isophorone diisocyanate, hydrogenated dimethylbenzene diisocyanate, dicyclohexyl methyl hydride diisocyanate etc.In addition, can be used together isocyanuric acid carboxylate, biuret compounds etc., aromatic isocyanate compound, the aliphatic isocyanates compound of described alicyclic isocyanate compound, or also can use common isocyanuric acid carboxylate etc.
Be polyvalent alcohol as described ester, can use polyol compound and polycarboxylate compound's carboxylate, by the synthetic material of the ring-opening reaction of cyclic ester compound and polyvalent alcohol etc.As the representational example of described polyol compound, can enumerate ethylene glycol, 1, ammediol, 1, 2-propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1, 3-butylene glycol, 1, 4-butylene glycol, 1, 6-hexanediol, 1, 9-nonanediol, 1, 10-decanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 3-methyl isophthalic acid, 5-pentanediol, dichloro neopentyl glycol, dibromoneopentyl glycol, 3-hydroxypivalic acid DOPCP, thiacyclohexane dihydroxymethyl, 1, 4-cyclohexanediol, spiral shell glycol, tristane dihydroxymethyl, hydrogenated bisphenol A, ethyleneoxide addition bisphenol-A, epoxypropane addition bisphenol-A, trimethylolethane, trimethylolpropane, glycerine, 3-methylpentane-1, 3, 5-triol, pentaerythrite, dipentaerythritol, tripentaerythritol, glucose etc.
As the described compound that contains carboxylic acid, can use the carboxylate of known various carboxylic acid, their acid anhydrides, their carboxylic acid compound and lower alkyl alcohol etc.As the described compound that contains carboxylic acid, specifically can exemplify maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, HET acid, Na Dike acid, chlorendic acid (acid of Network ロ レ Application デ ィ ッ Network), dimer acid, hexane diacid, succinic acid, alkenyl succinic acid, decanedioic acid, azelaic acid, 2,2,4-trimethyladipic acid, Isosorbide-5-Nitrae-cyclohexane dicarboxylic acid, terephthalic acid (TPA), 2-sulfonic acid terephthalic acid (TPA) list sodium, 2-sulfonic acid terephthalic acid (TPA) list potassium, m-phthalic acid, 5-sulfonic acid m-phthalic acid list sodium, 5-sulfonic acid m-phthalic acid list potassium, or two lower alkyl esters classes of dimethyl esters or the such 5-sulfonic acid m-phthalic acid list sodium of diethyl ester, or phthalic acid, 4-sulfonic acid phthalic acid, 1,10-decamethylene dicarboxylic acid, muconic acid, oxalic acid, malonic acid, glutaric acid, trimellitic acid, hexahydrophthalic acid, tetrabromophthalate, methyl cyclohexane thiazolinyl tricarboxylic acids, or Pyromellitic Acid, or their acid anhydrides, or they pass through methyl alcohol, the alcohol ester compounds that ethanol etc. form etc.
As described cyclic ester compound, can exemplify gamma-butyrolacton, gamma-valerolactone, δ-valerolactone, 6-caprolactone, replacement 6-caprolactone, maltonic acid-1,4-lactone, 1,10-phenanthrene carboxylic acid lactone (1,10-Off ェ Na Application ト レ Application カ Le ボ ラ Network ト Application), the lactone such as 4-amylene-5-lactone, 12-dodecalactone.Described replacement 6-caprolactone is various ε-monoalkyl caprolactones that alkyl has from 1 to 12 carbon atom, the lactone that for example can use ε-methyl caprolactone, ε-ethyl hexyl lactone, ε-propyl group caprolactone, ε-dodecyl caprolactone etc. to replace to 3 alkyl from 1 substituted alkyl lactone to 2.
As the acrylate compounds of described hydroxyl, can use known material, specifically, can exemplify 2-hydroxyethyl (methyl) acrylate, 2-hydroxypropyl (methyl) acrylate, 2-hydroxyl butyl (methyl) acrylate, 3-hydroxyl butyl (methyl) acrylate, 4-hydroxyl butyl (methyl) acrylate, polyethyleneglycol (methyl) acrylate, polypropylene glycol list (methyl) acrylate, pentaerythrite three (methyl) acrylate or glycidyl methacrylate-(methyl) acrylic acid addition product, (methyl) acrylate compounds that contains hydroxyl and the ring-opening reaction product of 6-caprolactone and modifier thereof etc. recorded above.
Be in polyvalent alcohol at described vibrin, from with the close property aspect of substrate layer 2, particularly preferably being polycaprolactone is polyvalent alcohol, preferably the vibrin of molecular weight from 300 to 5000 is polyvalent alcohol, in addition, preferably functional group's number is that more than 3 functional groups vibrin is polyvalent alcohol.
By the processing characteristics to ultraviolet-curing resin composition that is coating, adaptability and the various physical property of printings etc. are improved as object, use the acrylic ester reactive diluent of (b), specifically, can exemplify: (1) methoxyl ethylene glycol (methyl) acrylate, methoxy poly (ethylene glycol) (methyl) acrylate, β-(methyl) acryloxy ethyl hydrogen phthalic ester, β-(methyl) acryloxy ethyl hydrogen succinate ester, Nonylphenoxy ethyl (methyl) acrylate, the chloro-2-hydroxypropyl of 3-(methyl) acrylate, phenoxy group ethyl (methyl) acrylate, phenoxy group polyglycol (methyl) acrylate, methoxy poly (ethylene glycol) (methyl) acrylate, β-(methyl) acryloxy propyl group hydrogen phthalic ester, β-(methyl) acryloxy propyl group hydrogen succinate ester, butoxy polyglycol (methyl) acrylate, alkyl (methyl) acrylate, cyclohexyl (methyl) acrylate, tetrahydrofurfuryl (methyl) acrylate, isobornyl (methyl) acrylate, benzyl (methyl) acrylate, 2-hydroxyethyl (methyl) acrylate, 2-hydroxypropyl (methyl) acrylate, 2-hydroxyl-3-phenoxy propyl (methyl) acrylate, 2-(methyl) acryloxy ethyl-2-hydroxyethyl phthalic ester, 3-acryloyl-oxy base glycerol list (methyl) acrylate, 2-hydroxyl butyl (methyl) acrylate, 2-hydroxyl-1-(methyl) acryloxy-3-(methyl) acryloxy propane, polypropylene glycol list (methyl) acrylate, polyethyleneglycol (methyl) acrylate, poly-epsilon-caprolactone list (methyl) acrylate, dialkyl amido ethyl (methyl) acrylate, glycidyl (methyl) acrylate, single [2-(methyl) acryloxy ethyl] phosphate ester acid, trifluoroethyl (methyl) acrylate, 2,2,3,3-tetrafluoro propyl group (methyl) acrylate, 2,2,3,4,4,4-hexafluoro butyl (methyl) acrylate, perfluoro capryl ethyl (methyl) acrylate, dicyclopentenyl oxygen base alkyl (methyl) acrylate, dicyclopentenyl (methyl) acrylate, tricyclic decenyl (methyl) acrylate, tricyclic decenyl oxygen base ethyl (methyl) acrylate, the simple function polymerism thinning agents such as isobornyl oxygen base ethyl (methyl) acrylate, (2) 2,2-dimethyl-3-hydroxypropyl-2, two (methyl) acrylate of 2-dimethyl-3-hydroxy propionate, ethylene glycol bisthioglycolate (methyl) acrylate, polyglycol two (methyl) acrylate, propylene glycol two (methyl) acrylate, polypropylene glycol two (methyl) acrylate, BDO two (methyl) acrylate, 1,6-hexanediol two (methyl) acrylate, glycerine two (methyl) acrylate, neopentyl glycol two (methyl) acrylate, two (methyl) acrylate of 3-hydroxypivalic acid neopentyl glycol, two (methyl) acrylate of the ethylene oxide adduct of bisphenol-A, two (methyl) acrylate of the propylene oxide adduct of bisphenol-A, two (methyl) acrylate of 2,2 '-bis-(hydroxyl propoxyl group phenyl) propane, two (methyl) acrylate of 2,2 '-bis-(hydroxyl-oxethyl phenyl) propane, two (methyl) acrylate of tristane dihydroxymethyl, 2 officials' energy polymerism thinning agents such as (methyl) acrylic acid addition product of 2,2 '-bis-(glycidyl oxygen base phenyl) propane, (3) trimethylolpropane tris (methyl) acrylate, pentaerythrite three (methyl) acrylate, pentaerythrite four (methyl) acrylate, dipentaerythritol six (methyl) acrylate, tetramethylol methane three (methyl) acrylate, tetramethylol methane four (methyl) acrylate, three (methyl) acrylate of three (2-hydroxyethyl) isocyanuric acid ester, three (methyl) acrylate of three (hydroxypropyl) isocyanuric acid ester, three (methyl) acrylate of trimellitic acid, triallyl trimellitate, the multifunctional polymerization thinning agent such as cyanacrylate etc.
In described acrylic ester reactive diluent, particularly preferably be curability, to the close property on substrate layer 2 surfaces etc. good, the acrylate compounds with tetrahydrofurfuryl.Specifically, as such acrylate compounds, can exemplify tetrahydrofurfuryl acrylate, interior ester modified tetrahydrofurfuryl acrylate, the acrylic acid modified tetrahydrofurfuryl acrylate of dimer, the acrylic acid modified interior ester modified tetrahydrofurfuryl acrylate of dimer etc.
As the light trigger of (c), specifically can exemplify 2-hydroxy-2-methyl propiophenone, 1-hydroxy-cyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenyl acetophenone, 2,2-diethoxy-2-phenyl acetophenone, alkoxy benzene ethyl ketone, benzophenone and benzophenone derivates etc., can use a kind in them or combine two or more use in them.In addition, as the amount of allocating into of described light trigger, the acrylate resin composition with respect to 100 parts, preferably 0.2 part above below 30 parts, particularly preferably be 2 parts above below 20 parts.
In addition, be used to form the polymer composition of described bonding agent 7 except described substrate polymer, also can suitably allocate such as lubricant, small inorganic filler, hardening agent, plastifier, spreading agent, various levelling agent, antistatic agent, antioxidant, viscosity modifying agent etc. into.
In addition, as the average thickness H of the par of described adhesion preventing layer 6, preferably more than 0.2 of the mean grain size of described pearl 8 times, more preferably more than 0.3 times, further preferably more than 0.4 times.In addition, as the average thickness H of described par, preferably below 1 of the mean grain size of described pearl 8 times, more preferably below 0.8 times, further preferably below 0.6 times.If the average thickness H of the par of described adhesion preventing layer 6 is less than described lower limit, the effect of fixing pearl 8 reduces.On the contrary, if the average thickness H of described par exceedes the described upper limit, exist and be difficult to form protrusion, prevent the problem that adhesion function declines by pearl 8.
As the average covering thickness D of the bonding agent 7 at the top of the rear side of described pearl 8, preferably more than 0.1 μ m, more preferably more than 0.3 μ m, further preferably more than 0.5 μ m.In addition, as the average covering thickness D of the bonding agent 7 at the top of the rear side of described pearl 8, preferably below 3 μ m, more preferably below 2.5 μ m, further preferably below 2.0 μ m.By making the average covering thickness D of bonding agent 7 at top of rear side of pearl 8 in described scope, can meet the requirement of the slimming of this light diffusing sheet, and can prevent from rightly preventing that because causing the coverlay of bonding agent 7 to peel off with the friction of the optical component of rear side, can realize to improve described stripping film from causing the function of damage to the optical component of rear side.
As the pencil hardness at the back side of described bonding agent 7, preferably below the above 2H of H.By making described pencil hardness in described scope, because the bonding agent 7 contacting with the optical component of rear side has suitable hardness, so in the time that the coverlay of pearl 8 outsides of bonding agent 7 contacts with the optical component of rear side, can suppress rightly described bonding agent 7 optical component of rear side is caused to damage.
The manufacture method of light diffusing sheet
The manufacture method of this light diffusing sheet 1 comprises: adhere to preventing layer and form operation, form and adhere to preventing layer 6 in the rear side of transparent substrate layer 2; And light diffusion layer formation operation, form light diffusion layer 3 in the face side of described substrate layer 2.
The manufacture method of this light diffusing sheet 1 also comprises sheet forming process, and this sheet forming process, before described adhesion preventing layer forms operation and light diffusion layer formation operation, forms the sheet that forms substrate layer 2.As described substrate sheets forming process, there is no particular limitation, can adopt following method: the thermoplastic resin of melting, from T mould extrusion molding, is then extended to the long side direction of layer and layer Width being extruded into body, form thus substrate sheets.As the well-known extrusion molding method that has used T mould, can exemplify polishing roll method and chill roll method.In addition, also can carry out stretch process to substrate sheets, as well-known film drawing process, can exemplify the biaxial stretch-formed method of the biaxial stretch-formed method peace film of tubular film etc.
Described adhesion preventing layer forms operation and comprises: preparation adhere to preventing layer coating fluid operation (a), described coating fluid is coated on to the operation (b) on substrate layer 2 and make to be coated with after the curing operation (c) of coating fluid.
Described preparation section (a) is the operation of preparing the coating fluid that comprises pearl 8 and the formation of the bonding agent using ultraviolet curable resin as principal ingredient material.At this, form material about pearl 8 and bonding agent, can use the material identical with the material illustrating in the structure of light diffusing sheet 1.Prepare described coating fluid by pearl 8 being blended in the solvent that contains bonding agent formation material.
Described painting process (b) is the operation that the coating fluid of preparing is as described above coated on to the back side of substrate layer 2.As the method that is coated with described coating fluid, there is no particular limitation, can adopt known method, for example, can use slot coated method, rolling method, scraper for coating method, airblade coating method, flow coat method, intaglio plate rubbing method, spraying process or excellent Tu Fa etc.
Described curing process (c) is to the coating fluid irradiation ultraviolet radiation at the back side that is coated on substrate layer 2, and bonding agent 7 is solidified, and forms the operation that adheres to preventing layer 6.In the situation that using ultraviolet curing resin as bonding agent 7, in described curing process (c), by irradiation ultraviolet radiation, bonding agent 7 is solidified.As irradiating described ultraviolet method, can adopt well-known method, for example can adopt the method as light source such as Cooper-Hewitt lamp, high-pressure mercury-vapor lamp, extra-high-pressure mercury vapour lamp, metal halide lamp, ultraviolet laser.
Back light unit
For example, in the common back light for liquid crystal display device unit (Fig. 3 (a)) that this light diffusing sheet 1 of described structure had just been known since in the past, use.Specifically, described back light for liquid crystal display device unit comprise light guide plate, to the light source of the end face irradiation light of light guide plate, overlay configuration in the surperficial described light diffusing sheet 1 of light guide plate and overlay configuration the optical sheet such as prismatic lens and micro-lens sheet in the face side of described light diffusing sheet 1.
Advantage
Owing to can preventing from adhering to light guide plate by adhering to preventing layer 6, so described light diffusing sheet 1 is difficult to produce brightness disproportionation.In addition, adhere to preventing layer 6 and contain pearl 8 and the bonding agent using ultraviolet curing resin as principal ingredient 7, described pearl 8 ratios acrylic acid pearl quality softness in the past, so can prevent from rightly light guide plate to cause damage, therefore can prevent rightly the brightness disproportionation producing because of the damage of light guide plate.
Particularly owing to using the softer polyamide-based resin pearl 8 of quality, and making bonding agent 7 is to use the relatively bonding agent of the ultraviolet curing resin system of hard, therefore the binder film 7 of hard covers soft pearl 8, its result, even to resulting from the protuberance external force action of pearl 8, also can suppress only leading section (top of rear side) as in the past by conquassation, protuberance becomes flat mode with entirety and is out of shape, and becomes oval-shaped mode with section and is out of shape.Therefore, even if 1 effect of this light diffusing sheet has external force, contact area to be also difficult to increase, and then friction force is difficult to increase, and can improve significantly the effect that prevents other optical components of rear side to cause damage.
In addition, by using the principal ingredient of acrylic resin as bonding agent 7, with the adhesive property excellence of pearl 8, pearl 8 is difficult to depart from from bonding agent 7, and in addition, the coverlay 7a of bonding agent 7 is also difficult to peel off from pearl 8.
Other embodiments
Liquid crystal display optical sheet of the present invention is not limited to described embodiment, in the scope being intended to, can suitably change design in the present invention.; in said embodiment; for being illustrated with light diffusing sheet under the what is called of the surface configuration in light guide plate, but liquid crystal display optical sheet of the present invention also can be used as prismatic lens, is configured in the what is called of face side of prismatic lens and uses light diffusing sheet.
Embodiment
Below by embodiment, the present invention is specifically described, but the invention is not restricted to following embodiment.
Embodiment 1
Use the coating fluid obtaining after 0.118g nylon beads, 15g UV cured resin, 0.481g antistatic agent and 11g solvent, form and adhere to preventing layer, manufactured light diffusing sheet.The mean grain size of pearl is 5 μ m.The coating weight of described coating fluid is 2g/m
2.
The kinetic friction coefficient of having measured the light diffusing sheet back side (adhesion preventing layer) of described embodiment 1, its result is 0.272.
Comparative example 1
UV cured resin, antistatic agent and solvent use the material identical with embodiment 1, and the coating fluid that use is mixed to get the polydisperse polyurethane pearl of they and 0.118g, has formed adhesion preventing layer shape.The mean grain size of polyurethane pearl is 7 μ m.
The kinetic friction coefficient of having measured the back side (adhesion preventing layer) of the light diffusing sheet of described comparative example 1, its result is 0.415.
Because the kinetic friction coefficient of the light diffusing sheet of described comparative example 1 is large, when so light diffusing sheet slides on light guide plate surface, the possibility that the adhesive coverage film of bead surface is peeled off is very high, in contrast to this, the kinetic friction coefficient of the light diffusing sheet of described embodiment 1 is little, and the coverlay of bonding agent occurs, and the possibility of rough sledding such as to peel off little.
Industrial applicibility
As mentioned above, the back light unit that liquid crystal display optical sheet of the present invention, liquid crystal indicator are used and the manufacture method of liquid crystal display optical sheet, be useful as the member of formation of liquid crystal indicator, particularly can perform well in transmissive liquid crystal display device.
Claims (6)
1. a liquid crystal display optical sheet, is characterized in that,
Described liquid crystal display optical sheet comprises:
Transparent substrate layer; And
Adhere to preventing layer, be layered in the rear side of described substrate layer, the bonding agent that contains pearl and the described pearl of covering,
The principal ingredient of described pearl is polyamide-based resin,
Described bonding agent is made up of resin combination, and described resin combination is using ultraviolet curing resin as main polymer.
2. liquid crystal display optical sheet according to claim 1, is characterized in that,
The scleroscopic D hardness of described pearl is more than 30 below 70.
3. liquid crystal display optical sheet according to claim 1, is characterized in that,
The pencil hardness at the back side of described bonding agent is below the above 2H of H.
4. liquid crystal display optical sheet according to claim 1, is characterized in that,
The average covering thickness of the bonding agent at the top of the rear side of described pearl is below the above 3 μ m of 0.1 μ m.
5. liquid crystal display optical sheet according to claim 1, is characterized in that,
The mean grain size of described pearl is below the above 20 μ m of 2 μ m.
6. the back light unit that liquid crystal indicator is used, is characterized in that,
Possesses the liquid crystal display optical sheet described in any one in claim 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-288147 | 2012-12-28 | ||
| JP2012288147A JP6250278B2 (en) | 2012-12-28 | 2012-12-28 | Light diffusion sheet and backlight unit |
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| Publication Number | Publication Date |
|---|---|
| CN103913782A true CN103913782A (en) | 2014-07-09 |
| CN103913782B CN103913782B (en) | 2016-07-06 |
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| CN201310741117.0A Active CN103913782B (en) | 2012-12-28 | 2013-12-27 | Optical sheet and back light unit |
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| Country | Link |
|---|---|
| JP (1) | JP6250278B2 (en) |
| KR (1) | KR101605537B1 (en) |
| CN (1) | CN103913782B (en) |
| TW (1) | TWI519860B (en) |
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|---|---|---|---|---|
| CN105911755A (en) * | 2016-05-18 | 2016-08-31 | 青岛海信电器股份有限公司 | Backlight module and display device |
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| CN107111183A (en) * | 2014-12-18 | 2017-08-29 | 堺显示器制品株式会社 | Display device |
| JP6647761B2 (en) * | 2015-12-07 | 2020-02-14 | 恵和株式会社 | Top light diffusion sheet and backlight unit |
| JP6678638B2 (en) * | 2017-12-28 | 2020-04-08 | 恵和株式会社 | Backlight unit and liquid crystal display device |
| CN111954831B (en) * | 2018-03-07 | 2024-02-02 | 凸版印刷株式会社 | Optical film, optical barrier film, and backlight unit |
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| WO2001083619A1 (en) * | 2000-04-28 | 2001-11-08 | Toagosei Co., Ltd. | Plasticizer |
| JP2002162511A (en) * | 2000-09-18 | 2002-06-07 | Cosmo Tec:Kk | Reflection sheet with scratch preventing function for backlight of liquid crystal display device, and liquid crystal display device |
| JP2008512719A (en) * | 2004-09-13 | 2008-04-24 | エスケーシー ハース ディスプレイ フィルムズ カンパニー，リミテッド | Reflective sheet and backlight unit using the same |
| BRPI0519818A2 (en) * | 2004-12-20 | 2009-03-17 | Asahi Kasei Chemicals Corp | industrial continuous evaporator |
| TWI406770B (en) * | 2005-02-21 | 2013-09-01 | Dainippon Printing Co Ltd | Anti-glare optical laminate |
| JP5301127B2 (en) * | 2007-09-04 | 2013-09-25 | 恵和株式会社 | LCD module |
| JP6110051B2 (en) * | 2009-11-18 | 2017-04-05 | 恵和株式会社 | Optical sheet and backlight unit using the same |
| WO2012160894A1 (en) * | 2011-05-26 | 2012-11-29 | 株式会社ダイセル | Transparent multilayer film for displays, use of same, and touch panel |
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- 2012-12-28 JP JP2012288147A patent/JP6250278B2/en active Active
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- 2013-12-26 KR KR1020130164100A patent/KR101605537B1/en active IP Right Grant
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| JP2008003514A (en) * | 2006-06-26 | 2008-01-10 | Keiwa Inc | Optical unit and liquid crystal display module |
| CN101630029A (en) * | 2008-07-18 | 2010-01-20 | 株式会社Jiro企业策划 | Base sheet for optical sheet |
| CN102073080A (en) * | 2009-11-18 | 2011-05-25 | 惠和株式会社 | Optical slice and backlight unit using it |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101605537B1 (en) | 2016-03-22 |
| TW201426110A (en) | 2014-07-01 |
| KR20140086884A (en) | 2014-07-08 |
| JP6250278B2 (en) | 2017-12-20 |
| TWI519860B (en) | 2016-02-01 |
| JP2014130234A (en) | 2014-07-10 |
| CN103913782B (en) | 2016-07-06 |
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