CN103913782B - Optical sheet and back light unit - Google Patents
Optical sheet and back light unit Download PDFInfo
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- CN103913782B CN103913782B CN201310741117.0A CN201310741117A CN103913782B CN 103913782 B CN103913782 B CN 103913782B CN 201310741117 A CN201310741117 A CN 201310741117A CN 103913782 B CN103913782 B CN 103913782B
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- pearl
- binding agent
- acrylate
- light diffusing
- light
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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
It is an object of the invention to provide optical sheet and back light unit, can play the function being substantially prevented from that other components such as the light guide plate being arranged in light diffusing sheet rear side cause damage, described optical sheet is light diffusing sheet, and described back light unit employs described light diffusing sheet.The light diffusing sheet of the present invention includes: transparent substrate layer；Adhesion prevents layer, is layered in the rear side of described substrate layer, comprises pearl and covers the binding agent of described pearl, and the main component of described pearl is polyamide series resin, and described binding agent is constituted as the resin combination of main polymer by using ultraviolet curing resin.Preferably, the scleroscopic D hardness of described pearl is less than more than 30 70.Preferably, the pencil hardness at the back side of described binding agent is more than H below 2H.Preferably, the average thickness that covers of the binding agent at the top of the rear side of described pearl is more than 0.1 μm less than 3 μm.
Description
Technical field
The present invention relates to optical sheet and back light unit.
Background technology
As transmissive liquid crystal display device, being popularized from the transmissive liquid crystal display device of the backlight mode of back side illuminaton liquid crystal layer, the lower face side at liquid crystal layer is provided with the back light units such as edge-light type (side light type), underface type.As shown in (a) of Fig. 3, the back light unit 40 of described edge-light type generally comprises: light source 41；Light guide plate 42, for square tabular, configures in the way of described light source 41 by end；Multiple optical sheets 43, overlap in the face side of described light guide plate 42.Described optical sheet 43 has the function making transmitted ray diffusion, refraction etc., uses (1) to be arranged in the face side of light guide plate 42, mainly has the light diffusing sheet 44 of light diffusion function；And (2) are arranged in the face side of light diffusing sheet 44, there is the prismatic lens 45 etc. of the function making light alignment normal direction side reflect.
The function of described back light unit 40 is illustrated, first incides the light of light guide plate 42 by the pip at light guide plate 42 back side or reflector plate (omitting figure) and each offside reflection from light source 41, penetrate from light guide plate 42 surface.From the light of light guide plate 42 injection to light diffusing sheet 44, penetrate from surface after being spread.From the light of light diffusing sheet 44 surface injection to prismatic lens 45, reflect and penetrate in the prism portion of the multiple prominent bar shaped on surface to normal direction side by being formed, and then the whole face not having the liquid crystal layer represented in the figure of top is illuminated.
44 transmitted rays of described light diffusing sheet generally uniformly disperse, and the purpose using it is the brightness raising etc. utilizing its light diffusing can make brightness uniformity, making frontal.As shown in (b) of Fig. 3, as described light diffusing sheet 44, the adhesion including plastic substrate layer 46, the light diffusion layer 47 on the surface being layered in described substrate layer 46 and the back side that is layered in substrate layer 46 prevents layer 48.Described adhesion prevents layer 48 from preventing the back side of light diffusing sheet 44 and the surface adhesion (being adjacent to) of light guide plate 42 from producing the such rough sledding of interference fringe.Described adhesion prevents layer 48 be generally of spherical bead and cover the binding agent of heat-curing resin of described pearl, it is prevented that due to pearl, protuberance that rearwardly side is prominent adheres to light guide plate.
Acrylic acid pearl is generally used to prevent the pearl 50 (with reference to Japanese Laid-Open Patent Publication 2011-126274) of floor 48 as described adhesion., owing to acrylic acid pearl quality is harder, so sometimes because damage can be caused in the surface of the light guide plate 42 of the rear side being layered in light diffusing sheet 44 by the pearl 50 prominent to the back side of binding agent 49.So, if making light guide plate 42 damage, then sometimes because described damage produces the rough sledding such as brightness disproportionation.
Prior art literature
Patent documentation 1: Japanese Laid-Open Patent Publication 2011-126274
To prevent described rough sledding for objective, it is proposed that make pearl, binding agent etc. constitute and adhere to the technology that the material character preventing layer is soft., even if having distinguished the pearl etc. using described character soft, also damage can be caused in the surface of light guide plate.Its reason has been carried out wholwe-hearted research by the present inventor, think if configuring other the optical sheet such as prismatic lens in the face side of light diffusing sheet, then because the load of the optical sheet of described face side causes the protuberance due to pearl by conquassation, leading section (top of rear side) in the spherical form of particularly described soft pearl, as the contact portion contacted with light guide plate is easily deformed, therefore, become big with the contact area of the light guide plate being layered in rear side, and then frictional force becomes big, damage can be increased on the contrary.Additionally it is believed that cause that because of described frictional force the coverlay of the binding agent in the face in the outside of the pearl as the contact portion contacted with light guide plate is peeled off, because the stripping film of described binding agent will also result in the damage of light guide plate.
Summary of the invention
In view of described problem, it is an object of the invention to provide a kind of can giving full play to and prevent from the optical component being arranged in light diffusing sheet rear side causing the liquid crystal display optical sheet of the function of damage and employing the back light unit of described liquid crystal display optical sheet.
In order to solve described problem, present inventor has performed wholwe-hearted research, it has been found that by fixing the pearl with suitable stiffness with the binding agent of regulation, it is possible to give full play to the function preventing that the optical component of rear side is caused damage.
That is, in order to solve described problem, the present invention provides a kind of liquid crystal display optical sheet, comprising: transparent substrate layer；And adhesion prevents layer, it is layered in the rear side of described substrate layer, containing pearl and the binding agent covering described pearl, the main component of described pearl is polyamide series resin, the scleroscopic D hardness of described pearl is less than more than 30 70, the mean diameter of described pearl is more than 2 μm less than 20 μm, the coefficient of alteration of described pearl is less than more than 0.05 1, described binding agent is made up of resin combination, described resin combination using ultraviolet curing resin as main polymer, the content of described pearl is below more than 0.1 mass parts 5 mass parts relative to the resinous principle of the described binding agent of 100 mass parts.
This liquid crystal display optical sheet passes through the pearl of the polyamide series resin using quality softer, the pearl preventing layer is adhered to as constituting, and to make binding agent be the harder ultraviolet curing resin of quality, thus the binder film becoming hard covers soft pearl.Therefore, even if External Force Acting is in the protuberance due to pearl, this liquid crystal display optical sheet only makes leading section (top of rear side) by conquassation as can also suppressing in the past, protuberance by entirety become flat in the way of deform, that is, protuberance deforms in the way of section becomes ellipse.Its result, even if the effect of this liquid crystal display optical sheet has external force, contact area is also difficult to increase, and then frictional force is also difficult to increase, it is possible to significantly improve the effect preventing that other optical components of rear side cause damage.
The scleroscopic D hardness of described pearl is less than more than 30 70.By making the scleroscopic D hardness of pearl in described scope, it is possible to improve further and prevent from the optical component of rear side is caused the effect of damage.
Preferably, the pencil hardness at the back side of described binding agent is more than H below 2H.By making described pencil hardness in described scope, the binding agent contacted with the optical component of rear side has suitable hardness, so when the coverlay in face outside the pearl of binding agent contacts with the optical component of rear side, it is possible to it is reliably suppressed the described binding agent optical component to rear side and causes damage.
Preferably, the average thickness that covers of the binding agent at the top of the rear side of described pearl is more than 0.1 μm less than 3 μm.By making the thickness of the coverlay of described binding agent in described scope, this liquid crystal display optical sheet can be made to meet the requirement of slimming, and can be reliably prevented because causing the coverlay of binding agent to peel off with the friction of the optical component of rear side, it is possible to achieve improve and prevent stripping film from the optical component of rear side is caused the function of damage.
Preferably, the mean diameter of described pearl is more than 2 μm less than 20 μm.By making the mean diameter of pearl in described scope, it is possible to make this liquid crystal display optical sheet meet the requirement of slimming, be effectively realized and prevent the optical component of rear side from sustaining damage, and the function preventing adhering to can be given full play to.
In order to solve described problem, the present invention also provides for the back light unit of a kind of liquid crystal indicator, and it possesses described liquid crystal display optical sheet.Prevent from the optical component of described light diffusing sheet rear side is caused damage thus, it is possible to improve rightly.
Additionally, in the present invention, so-called face side refers to the side of the people of the viewing when being assembled on liquid crystal indicator, and so-called rear side refers to the side contrary with face side.Mean diameter refers to the meansigma methods of the particle diameter of random 30 granules extracted out from the granule of observation under the ultramicroscope that multiplying power is 1000 times, particle diameter be by Feret's diameter (with the parallel lines of certain orientation clamp projection as time interval) define.Pencil hardness is the Pencil scratch value obtained according to the test method 8.4 of JISK5400, is the value measured in the region do not have pearl.Scleroscopic D hardness is the value arrived according to JISK7215 measurement.The average thickness of the coverlay of the so-called binding agent covering nylon beads is the section with this light diffusing sheet of electron microscope observation, from that select at random, cover the coverlay of the binding agent at 10 positions of nylon beads thickness (distance from the interface of nylon beads to outer surface) mean value calculation out.
Cross as mentioned above, the liquid crystal display optical sheet of the present invention and possess the back light unit of described liquid crystal display optical sheet, it is possible to give full play to the function preventing the optical component of the rear side to liquid crystal display optical sheet from causing damage.
Accompanying drawing explanation
Fig. 1 is the sectional view of the light diffusing sheet schematically showing 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 axonometric chart schematically showing common edge-light type back light unit, and (b) of Fig. 3 is the sectional view schematically showing common light diffusing sheet.
Description of reference numerals
1 light diffusing sheet
2 substrate layers
3 light diffusion layers
4 binding agents
5 light diffusing agents
6 adhesions prevent layer
7 binding agents
7a coverlay
8 pearls
Detailed description of the invention
Below as an embodiment of the invention, the optical sheet for the backboard of liquid crystal indicator is example, is described in detail with reference to suitable accompanying drawing.
Light diffusing sheet
Light diffusing sheet 1 possesses the adhesion of substrate layer 2 and the rear side that is layered in described substrate layer 2 and prevents layer 6.Described light diffusing sheet 1 is also equipped with being layered in the optical functional layer of the face side of substrate layer 2, and in the present embodiment, optical functional layer is the light diffusion layer making the light from light guide plate spread.
Substrate layer
Substrate layer 2 is made up of the transparent synthetic resin that can make light therethrough.At this, transparent can also be colored transparent, translucent, in order to improve light transmittance, it is preferred that water white transparency.As the synthetic resin for described substrate layer 2, there is no particular limitation, for instance can enumerate polyethylene terephthalate, PEN, acrylic resin, Merlon, polystyrene, polyolefin, cellulose acetate, weatherability vinyl chloride etc..These, it is preferred to the polyethylene terephthalate that the transparency is excellent, intensity is high, it is especially preferred that the improved polyethylene terephthalate of bending property.
As the average thickness of substrate layer 2, although there is no particular limitation, but it is preferred that more than 10 μm, more preferably more than 35 μm, it is further preferred that more than 50 μm.Additionally, as described average thickness, it is preferred that less than 500 μm, more preferably less than 250 μm, it is further preferred that less than 188 μm.When the average thickness of described substrate layer 2 is less than described lower limit, exists, when being coated with light diffusion layer 3 or adhering to the formation material preventing layer 6, curling problem occurs.Otherwise, when described average thickness exceedes the described upper limit, sometimes result in the luminance-reduction of liquid crystal indicator, additionally, can cause that the thickness of back light unit becomes big thus against in the requirement to liquid crystal indicator slimming.
Optical functional layer
The surface of substrate layer 2 it is layered in, by forming described light diffusion layer 3 at the surface of substrate layer 2 coating coating fluid containing light diffusing agent 5 and binding agent 4 as the light diffusion layer 3 of optical functional layer.Described light diffusion layer 3 has binding agent 4 and is contained in the light diffusing agent 5 in described binding agent 4.As described above containing light diffusing agent 5 in light diffusion layer 3, it is possible to make from the back side lateral face side spread transmitted through the uniform light of light diffusion layer 3.Additionally, generally uniformly formed fine concavo-convex on the surface of light diffusion layer 3 by light diffusing agent 5.So, the refraction action of the fine concavo-convex lens by being formed on the surface of light diffusing sheet 1, it is possible to make light spread better.
Light diffusing agent 5 is the granule with the character making light spread, and is broadly divided into inorganic filler and organic filler.Specifically, as inorganic filler, it is possible to use silicon dioxide, aluminium hydroxide, aluminium oxide, zinc oxide, barium sulfide, magnesium silicate or their mixture.Concrete material as organic filler, it is possible to use acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyamide, polyacrylonitrile etc..These, it is preferred to the acrylic resin that the transparency is high, it is especially preferred that polymethyl methacrylate (PMMA).
There is no particular limitation for the shape of light diffusing agent 5, for instance can enumerate spherical, cubic, needle-like, bar-shaped, spindle shape, tabular, flakey, threadiness etc., these, it is preferred to the spherical pearl that light diffusing can be excellent.
Although there is no particular limitation for the mean diameter of light diffusing agent 5, but as described mean diameter, it is preferred that more than 1 μm, more preferably more than 2 μm, it is further preferred that more than 5 μm.Additionally, as described mean diameter, it is preferred that less than 50 μm, more preferably less than 20 μm, it is further preferred that less than 15 μm.If the mean diameter of described light diffusing agent 5 less than described lower limit, then concavo-convex the diminishing on light diffusion layer 3 surface formed by light diffusing agent 5, exist can not meet as the light diffusing required for light diffusing sheet 1 can problem.On the contrary, if described mean diameter exceedes the described upper limit, then the thickness of light diffusing sheet 1 increases, and uniform diffusion can become difficulty in addition.
Although there is no particular limitation for the content of light diffusing agent 5, but as the light diffusing agent 5 content relative to the resinous principle of the binding agent 4 of 100 mass parts, preferably more than 10 mass parts, more preferably more than 20 mass parts, it is further preferred that more than 50 mass parts.Additionally, as described content, it is preferred that below 500 mass parts, more preferably below 300 mass parts, it is further preferred that below 200 mass parts.When the content of light diffusing agent 5 is less than described lower limit, there is the problem that light diffusing can be inadequate.On the contrary, if the content of light diffusing agent 5 exceedes the described upper limit, then the effect fixing light diffusing agent 5 reduces.In addition, the what is called that the face side of prismatic lens configures uses light diffusing sheet, because light diffusing energy that need not be high, so as the content of light diffusing agent 5, preferably below more than 10 mass parts 40 mass parts, more preferably below more than 20 mass parts 30 mass parts.
By making the polymer composition containing substrate polymer solidify (crosslinking etc.) and form binding agent 4.The whole surface being fixed on substrate layer 2 is configured by 4 light diffusing agent 5 substantially isodensity of described binding agent.Additionally, for formed the polymer composition of described binding agent 4 can also suitably be allocated into such as small inorganic filler, firming agent, plasticizer, dispersant, various levelling agent, antistatic additive, UV absorbent, antioxidant, viscosity modifying agent, lubricant, Photostabilised dose etc..
As described substrate polymer, there is no particular limitation, such as can enumerate acrylic resin, polyurethane, polyester, fluorine resin, silicon system resin, polyamide-imides, epoxy resin, ultraviolet curing resin etc., it is possible to one kind or two or more described polymer mixed is used.Especially as described substrate polymer, it is preferred that good processability, the polyhydric alcohol of described light diffusing sheet 1 can be readily formed by methods such as coatings.Additionally, from the view point of improve light transmission, the substrate polymer itself for binding agent 4 is preferably transparent, it is especially preferred that water white.
As described polyhydric alcohol, the PEPA etc. can enumerate the polyhydric alcohol that the polymerizing monomer components including hydroxyl unsaturated monomer is obtained, obtaining when hydroxyl is superfluous, single described polyhydric alcohol can be used, it is also possible to described polyhydric alcohol of more than two kinds mixing is used.
As hydroxyl unsaturated monomer, it is possible to enumerate: hydroxyl unsaturated monomers such as (a) such as acrylic acid 2-hydroxyl ethyl ester, acrylic acid 2-hydroxypropyl acrylate, HEMA, methacrylic acid 2-hydroxypropyl acrylate, 1-propenol-3, homoallylic alcohol, cinnamyl alcohol, crotonyl alcohol .s；B () is by the dihydroxylic alcohols such as such as ethylene glycol, oxirane, propylene glycol, expoxy propane, butanediol, epoxy butane, 1,4-double; two (methylol) thiacyclohexane, phenyl glycidyl ether, capric acid ethylene oxidic ester, プ ラ Network セ Le FM-1 (Daisel chemical industry Co., Ltd's system) or epoxide and hydroxyl unsaturated monomer etc. that such as unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid .beta.-methylacrylic acid, itaconic acid is obtained by reacting.Can by the one kind or two or more polymerization selected from described hydroxyl unsaturated monomer be manufactured polyhydric alcohol.
nullIn addition，Can also from ethyl acrylate、N-propyl、Isopropyl acrylate、N-butyl acrylate、Tert-butyl acrylate、EHA、Ethyl methacrylate、N propyl methacrylate、Isopropyl methacrylate、N-butyl methacrylate, methyl tert butyl acrylate, methyl acrylic acid ethyl ester, cyclohexyl methyl glycidyl ester of acrylic acid, methyl acrylate, styrene,Vinyltoluene、1-methyl styrene、Acrylic acid、Methacrylic acid、Acrylonitrile、Vinylacetate、Propionate、Stearic acid vinyl ester、Allyl acetate、Diallyl adipate、Diallyl itaconate、Ethyl maleate.、Polyvinyl chloride、Vinylidene chloride、Acrylamide、N hydroxymethyl acrylamide、N-butoxy methyl acrylamide、Diacetone acrylamide、Ethylene、Propylene、The one kind or two or more ethylene unsaturated monomer selected in isoprene etc. manufactures polyhydric alcohol with the hydroxyl polymerization of unsaturated monomers selected from described (a) and (b).
It is less than more than 1,000 500000 the number-average molecular weight of the polyhydric alcohol obtained after including the polymerizing monomer components of hydroxyl unsaturated monomer, it is preferred that less than more than 5,000 100000.Additionally, described hydroxyl value is less than more than 5 300, it is preferred that less than more than 10 200, more preferably less than more than 20 150.
Can hydroxyl value in the polyhydric alcohol such as propylene glycol, hexanediol, Polyethylene Glycol, trimethylolpropane more than the carboxyl number of polyprotic acid when make following (c) and (d) reaction manufacture the PEPA obtained when hydroxyl is superfluous.(c) be such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, hexanediol, decanediol, 2,2,4-trimethyl-1,3-pentanediol, trimethylolpropane, hexanetriol, glycerol, tetramethylolmethane, cyclohexanediol, hydrogenated bisphenol A, double; two (methylol) thiacyclohexane, hydroquinone double; two (hydroxyethyl ether), three (ethoxy) polyhydric alcohol such as isocyanates, benzene dimethanol；D () is the polyprotic acid such as such as maleic acid, fumaric acid, succinic acid, adipic acid, decanedioic acid, Azelaic Acid, trimellitic acid, p-phthalic acid, phthalic acid, M-phthalic acid.
The number-average molecular weight of the PEPA obtained when hydroxyl is superfluous is less than more than 500 300000, it is preferred that less than more than 2,000 100000.Additionally, its hydroxyl value is less than more than 5 300, it is preferred that less than more than 10 200, more preferably less than more than 20 150.
As the polyhydric alcohol that the substrate polymer of described polymer composition uses, it is preferred that described PEPA and by that obtain after including the polymerizing monomer components of described hydroxyl unsaturated monomer and that there is (methyl) acrylic acid unit etc. acrylic polyol.Using strong as the weatherability of the binding agent 4 of substrate polymer to PEPA or acrylic polyol, it is possible to suppress described light diffusing sheet 1 xanthochromia etc..In addition it is possible to use any one party in described PEPA and acrylic polyol, it is possible to use both sides.
In addition, hydroxyl number in described PEPA and acrylic polyol, if each molecule has more than 2, then there is no particular limitation, if but the hydroxyl value in solid constituent is less than 10, then there is the tendency that the physical property of the coverlays such as number of crosslinks minimizing, solvent resistance, resistance to water, thermostability, case hardness reduces.
Adhesion prevents layer
Adhere to the back side preventing layer 6 to be layered in substrate layer 2, contain pearl 8 at the back side of substrate layer 2 and cover the binding agent 7 of pearl 8.Described adhesion prevent layer 6 by using described pearl 8 as rising thus form protuberance, the light guide plate being therefore prevented from light diffusing sheet 1 and described rear side adheres to, it is possible to suppress the brightness disproportionation of the picture of liquid crystal indicator.Additionally, as it is shown in figure 1, adhere to and prevent layer 6 to have the described protuberance formed because of the existence of pearl 8 and the par being absent from pearl 8.
The main component of pearl 8 is polyamide series resin.As polyamide series resin, it is possible to use aliphatic polyamide resin, aromatic polyamide resin etc..These, it is preferred to use the aliphatic polyamide resin that hardness etc. are suitable.As described aliphatic polyamide resin, it is possible to use nylon 6, nylon66 fiber, nylon 68, Stanyl (DSM)., nylon 612, NYLON610 etc..Pearl 8 can also contain one or more above described polyamide series resin.Additionally, pearl 8 can also be as main component and containing the nylon copolymer of composition beyond polyamide series resin using polyamide series resin, it is also possible to be containing polyamide series resin beyond the hybrid resin of other resins.
There is no particular limitation for the shape of pearl 8, for instance can enumerate spherical, needle-like, bar-shaped, spindle shape, tabular, flakey, threadiness etc., it is preferred that adheres to prevent function etc. excellent spherical.
The scleroscopic D hardness of pearl 8, it is preferred that more than 30, more preferably more than 40.Additionally, as described scleroscopic D hardness, it is preferred that less than 70, more preferably less than 60.When the scleroscopic D hardness of described pearl 8 is less than described lower limit, when the optical sheets such as prismatic lens being arranged in the face side of light diffusing sheet 1, there is the problem because the load of described optical sheet can cause pearl 8 excessive deformation, binding agent 7 to peel off from pearl 8.On the contrary, when described scleroscopic D hardness exceedes the described upper limit, there is the function that can not fully obtain preventing the light guide plate of the rear side to light diffusing sheet 1 from causing damage.
Pearl 8 can be single dispersing pearl can also be polydispersion pearl.At this, to the coefficient of alteration of the particle diameter of pearl 8, there is no particular limitation, is suitable for using the coefficient of alteration of the particle diameter of less than more than 0.05 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, then existing actually can to the problem of the load of prominent a part of pearl overaction.On the contrary, if described coefficient of alteration is less than described lower limit, the then problem that there is the high cost of the pearl of use.
Although there is no particular limitation for the mean diameter X of described pearl 8, but as described mean diameter X, it is preferred that more than 2 μm, more preferably more than 3 μm, it is further preferred that more than 4 μm.Additionally, as described mean diameter X, it is preferred that less than 20 μm, more preferably less than 10 μm, it is further preferred that less than 6 μm.By making the mean diameter X of pearl 8 in described scope, it is possible to make this liquid crystal display optical sheet meet the requirement of slimming, can be effectively realized and prevent from the optical component of rear side causing damage and can fully realizing adhesion preventing function.
Although there is no particular limitation for the content of pearl 8, but the resinous principle of the binding agent 7 relative to 100 mass parts, more than the content of pearl 8 preferably 0.1 mass parts, more preferably more than 0.3 mass parts, it is further preferred that more than 0.5 mass parts.Additionally, as the content of described pearl 8, it is preferred that below 5 mass parts, more preferably below 4 mass parts, it is further preferred that below 3 mass parts.When the content of described pearl 8 is less than described lower limit, exists and adhere to that the existence ratio preventing pearl 8 in layer 6 is very few, can not fully realize the function that prevents and light guide plate adheres to.On the other hand, how when described content exceedes the described upper limit, there is following problems: although the existence ratio change adhering to the pearl 8 prevented in layer 6 can not improve adhesion further and prevent function；Because pearl 8 hinders the function of this light diffusing sheet 1.
Binding agent 7 is formed as the resin combination of main polymer by using ultraviolet curing resin.As described main polymer, it does not have limit especially, it is possible to enumerate the radical polymerization syzygy resins such as (a) epoxy acrylate, urethane acrylate, melamine acrylate；The polymercaptan of (b) light addition polymerization type-polyenoid system resin；(c) light cation polymerization type resin etc..Wherein, as described main polymer, it is preferred that ultraviolet hardening acrylic resin.
In addition, using described ultraviolet curing resin as in the resin combination of main polymer, light trigger and diluent can be allocated into, can also suitably allocate in addition for adjusting the various solvents of viscosity, antistatic additive, slipping agent, photosensitizer, polymerization inhibitor, antioxidant, dispersant, surfactant, inorganic filler, inorganic pigment, organic pigment, organic dyestuff, light stabilizer, light absorber, levelling agent, defoamer, antirust agent etc..
As using the ultraviolet curing resin resin combination as main polymer, it is preferred that contain: the urethane acrylate that the acrylate compounds of alicyclic isocyanate compound, ester system polyhydric alcohol and hydroxyl is fabricated by by (a) as essential component；(b) acrylic ester reactive diluent；And (c) light trigger.
Make the acrylate compounds of alicyclic isocyanate compound, ester system polyhydric alcohol and hydroxyl when 50～120 DEG C, have polyurethane-reinforcement catalyst as required, there is polyurethane-reinforcement reaction, thus can be easily synthesized the urethane acrylate of (a).Even if described polyurethane-reinforcement reaction is the reaction putting into whole composition quickly, but can also by polyol component and isocyanate prepolymer composition under NCO temporary excess after synthetic prepolymer, the acrylate compounds utilizing hydroxyl makes the NCO reaction of remaining, it is also possible to synthesis.In addition it is also possible to employing following manner: after the acrylate compounds of hydroxyl and isocyanate compound synthetic prepolymer, the NCO of remaining will be made to react with PEPA under NCO temporary excess.As the molecular weight by the described urethane acrylate being synthesized, it is preferred that in the scope of 700～20000.
As described alicyclic isocyanate compound, it is possible to use isophorone diisocyanate, hydrogenated dimethylbenzene diisocyanate, dicyclohexyl methyl hydride diisocyanate etc..Furthermore, it is possible to and with the isocyanuric acid carboxylate of described alicyclic isocyanate compound, biuret compounds etc., aromatic isocyanate compound, aliphatic isocyanates compound, or common isocyanuric acid carboxylate etc. can also be used.
As described ester system polyhydric alcohol, it is possible to use the carboxylate of polyol compound and polycarboxylate compound, the material etc. synthesized by the ring-opening reaction of cyclic ester compounds and polyhydric alcohol.nullRepresentational example as described polyol compound，Ethylene glycol can be enumerated、1,Ammediol、1,2-propylene glycol、Diethylene glycol、Dipropylene glycol、Neopentyl glycol、1, 3 - butanediol, 1, 4 - butanediol, 1, 6 - f glycol, 1, 9 - nonyl glycol, 1, 10 - sebacic alcohol, 2, 4-trichlorobenzene 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、Expoxy propane addition bisphenol-A、Trimethylolethane、Trimethylolpropane、Glycerol、3-methylpentane-1,3,5-triol、Tetramethylolmethane、Dipentaerythritol、Tripentaerythritol、Glucose etc..
As the described compound containing carboxylic acid, it is possible to use the carboxylate etc. of known various carboxylic acids, their anhydride, their carboxylic acid compound and lower alkyl alcohol.nullAs the described compound containing carboxylic acid，Specifically can enumerate maleic acid、Fumaric acid、Itaconic acid、Citraconic acid、Tetrahydrophthalic acid、HET acid、Dick acid bacteria, chlorine acid, dimer acid, adipic acid, succinic acid, alkenyl succinic acid,Decanedioic acid、Azelaic Acid、2,2,4-trimethyladipic acid、1,4-cyclohexane dicarboxylic acid、P-phthalic acid、2-sulfonic acid p-phthalic acid list sodium、2-sulfonic acid p-phthalic acid list potassium、M-phthalic acid、5-sulfonic acid M-phthalic acid list sodium、5-sulfonic acid M-phthalic acid list potassium、Or two low alkyl group esters of dimethyl esters or diethyl ester such 5-sulfonic acid M-phthalic acid list sodium、Or phthalic acid、4-sulfonic acid phthalic acid、1,10-decamethylene dicarboxylic acids、Muconic acid、Oxalic acid、Malonic acid、1,3-propanedicarboxylic acid、Trimellitic acid、Hexahydrophthalic acid、Tetrabromophthalate、Methyl cyclohexane thiazolinyl tricarboxylic acids、Or Pyromellitic Acid、Or their anhydride、Or they pass through methanol、The alcohol ester compounds etc. that ethanol etc. are formed.
As described cyclic ester compounds, gamma-butyrolacton, gamma-valerolactone, δ-valerolactone, 6-caprolactone, replacement 6-caprolactone, maltonic acid-1 can be enumerated, 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 caprolactone that alkyl has the carbon atom from 1 to 12, for instance ε-methylcaprolactone, ε-ethyl hexyl lactone, ε-propyl group caprolactone, ε-dodecyl caprolactone etc. can be used to replace, from 1, the lactone that the alkyl lactone class alkyl to 2 to 3 replaces.
Acrylate compounds as described hydroxyl, known material can be used, specifically, 2-ethoxy (methyl) acrylate can be enumerated, 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, tetramethylolmethane three (methyl) acrylate or glycidyl methacrylate-(methyl) acrylic acid adduct, the ring-opening reaction product etc. of (methyl) acrylate compounds containing hydroxyl above recorded and 6-caprolactone and modifier thereof.
In described polyester resin system polyhydric alcohol, from the close property aspect with substrate layer 2, it is especially preferred that polycaprolactone system polyhydric alcohol, it is preferred that the molecular weight polyester resin system polyhydric alcohol from 300 to 5000, moreover it is preferred that the polyester resin system polyhydric alcohol that functional group number is more than 3 functional groups.
nullBy to the processing characteristics of ultraviolet-curing resin composition that is coating、Adaptability and the various physical property of printing etc. improve as purpose，Use the acrylic ester reactive diluent of (b)，Specifically，Can enumerate: (1) methoxyl group ethylene glycol (methyl) acrylate、Methoxy poly (ethylene glycol) (methyl) acrylate、β-(methyl) acryloyl-oxyethyl hydrogen phthalic acid ester、Beta - (methyl) acryloyl oxygen hydrogen ethyl succinate, nonyl phenoxy ethyl (meth) acrylate, 3 - chloro - 2 - hydroxypropyl (meth) acrylate, phenoxy ethyl (meth) acrylate, phenoxy polyethylene glycol (meth) acrylate, methoxy polyethylene glycol (meth) acrylate,β-(methyl) acryloxypropyl hydrogen phthalic acid ester、β-(methyl) acryloxypropyl hydrogen succinate ester、Butoxy Polyethylene Glycol (methyl) acrylate、Alkyl (methyl) acrylate、Cyclohexyl (methyl) acrylate、Tetrahydrofurfuryl (methyl) acrylate、Isobornyl (methyl) acrylate、Benzyl (methyl) acrylate、2-ethoxy (methyl) acrylate、2-hydroxypropyl (methyl) acrylate、2-hydroxyl-3-phenoxy propyl (methyl) acrylate、2-(methyl) acryloyl-oxyethyl-2-ethoxy phthalic acid 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、Di-alkyaminoethyl group (methyl) acrylate、Glycidyl (methyl) acrylate、Single [2-(methyl) acryloyl-oxyethyl] phosphate ester acid、Trifluoroethyl (methyl) acrylate、2,2,3,3-tetra-fluoropropyl (methyl) acrylate、2,2,3,4,4,4-hexafluoro butyl (methyl) acrylate、Perfluorooctylethyl group (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 diluent such as isobornyl oxygen base ethyl (methyl) acrylate；null(2)2,2-dimethyl-3-hydroxypropyl-2,Two (methyl) acrylate of 2-dimethyl-3-hydroxy propionate、Ethylene glycol bisthioglycolate (methyl) acrylate、Polyethylene Glycol two (methyl) acrylate、Propylene glycol two (methyl) acrylate、Polypropylene glycol two (methyl) acrylate、1,4-butanediol two (methyl) acrylate、1,6- f glycol 2 (meth) acrylic acid ester and glycerol (meth) acrylate, neopentyl glycol (meth) acrylate, hydroxy valeric acid of neopentyl glycol (meth) acrylate, bisphenol A epoxy ethane adduct of (meth) acrylate, bisphenol A epoxy propane adduct of (meth) acrylate,2,Two (methyl) acrylate of 2 '-two (hydroxy propyloxy group phenyl) propane、2,Two (methyl) acrylate of 2 '-two (hydroxyethoxyphenyl) propane、Two (methyl) acrylate of tristane dihydroxymethyl、2,(methyl) acrylic acid adduct of 2 '-two (glycidyloxyphenyl) propane etc. 2 official can polymerism diluent；(3) trimethylolpropane tris (methyl) acrylate, tetramethylolmethane three (methyl) acrylate, tetramethylolmethane four (methyl) acrylate, dipentaerythritol six (methyl) acrylate, tetramethylol methane three (methyl) acrylate, tetramethylol methane four (methyl) acrylate, three (methyl) acrylate of three (2-ethoxy) isocyanuric acid ester, three (methyl) acrylate of three (hydroxypropyl) isocyanuric acid ester, three (methyl) acrylate of trimellitic acid, triallyl trimellitate, the multifunctional polymerism diluent such as Triallyl isocyanurate etc..
In described acrylic ester reactive diluent, it is especially preferred that curable, to acrylate compounds good, that there is tetrahydrofurfuryl such as the close property on substrate layer 2 surface.Specifically, as such acrylate compounds, it is possible to enumerate tetrahydrofurfuryl acrylate, lactone-modified tetrahydrofurfuryl acrylate, dimer acrylic acid modified tetrahydrofurfuryl acrylate, the acrylic acid modified lactone-modified tetrahydrofurfuryl acrylate of dimer etc..
Light trigger as (c), specifically can enumerate 2-hydroxy-2-methyl propiophenone, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenyl acetophenone, 2,2-diethoxy-2-phenyl acetophenone, alkoxy benzene ethyl ketone, benzophenone and benzophenone derivates etc., it is possible to use in them a kind or combine two or more in them and use.Additionally, as the amount of allocating into of described light trigger, the acrylate composition relative to 100 parts, it is preferred that more than 0.2 part less than 30 parts, it is especially preferred that more than 2 parts less than 20 parts.
In addition, for forming the polymer composition of described binding agent 7 except described substrate polymer, it is also possible to suitably allocate such as lubricant, small inorganic filler, firming agent, plasticizer, dispersant, various levelling agent, antistatic additive, antioxidant, viscosity modifying agent etc. into.
Additionally, prevent the average thickness H of the par of layer 6 as described adhesion, it is preferred that more than 0.2 times of the mean diameter of described pearl 8, more preferably more than 0.3 times, it is further preferred that more than 0.4 times.Additionally, as the average thickness H of described par, it is preferred that less than 1 times of the mean diameter of described pearl 8, more preferably less than 0.8 times, it is further preferred that less than 0.6 times.If described adhesion prevents the average thickness H of the par of layer 6 less than described lower limit, then the effect fixing pearl 8 reduces.On the contrary, if the average thickness H of described par exceedes the described upper limit, then there is the problem being difficult to be formed protrusion by pearl 8, prevent adhesion function from declining.
The average of binding agent 7 as the top of the rear side of described pearl 8 covers thickness D, it is preferred that more than 0.1 μm, more preferably more than 0.3 μm, it is further preferred that more than 0.5 μm.Additionally, the average of binding agent 7 as the top of the rear side of described pearl 8 covers thickness D, it is preferred that less than 3 μm, more preferably less than 2.5 μm, it is further preferred that less than 2.0 μm.By making the average thickness D that covers of the binding agent 7 at the top of the rear side of pearl 8 in described scope, the requirement of the slimming of this light diffusing sheet can be met, and can prevent because causing the coverlay of binding agent 7 to peel off with the friction of the optical component of rear side rightly, it is possible to achieve improve and prevent described stripping film from the optical component of rear side is caused the function of damage.
Pencil hardness as the back side of described binding agent 7, it is preferred that more than H below 2H.By making described pencil hardness in described scope, binding agent 7 owing to contacting with the optical component of rear side has suitable hardness, so when the coverlay outside the pearl 8 of binding agent 7 contacts with the optical component of rear side, it is possible to suppress described binding agent 7 that the optical component of rear side is caused damage rightly.
The manufacture method of light diffusing sheet
The manufacture method of this light diffusing sheet 1 includes: adheres to and prevents a layer formation process, and the rear side at transparent substrate layer 2 forms adhesion and prevents layer 6；And light diffusion layer formation process, the face side at described substrate layer 2 forms light diffusion layer 3.
The manufacture method of this light diffusing sheet 1 also includes sheet forming process, and this sheet forming process prevents in described adhesion before layer formation process and light diffusion layer formation process, forms the sheet constituting substrate layer 2.As described substrate sheets forming process, there is no particular limitation, it is possible to adopts following method: melted thermoplastic resin from T mould extrusion molding, then by being extruded into the body long side direction to layer and the extension of layer width, is consequently formed substrate sheets.As the well-known extrusion molding method employing T mould, it is possible to enumerate polishing roll method and chill roll method.In addition it is also possible to substrate sheets is carried out stretch process, as well-known film drawing process, it is possible to enumerate tubular film biaxial stretching process peace film biaxial stretching process etc..
Described adhesion prevents layer formation process from including: the operation (c) that preparation adheres to the operation (a) preventing layer coating fluid, described coating solution operation (b) on substrate layer 2 and the coating fluid after making coating are solidified.
Described preparation section (a) is to prepare comprise pearl 8 and ultraviolet curable resin is formed as the binding agent of main component the operation of coating fluid of material.At this, form material about pearl 8 and binding agent, it is possible to use the material identical with the material illustrated in the structure of light diffusing sheet 1.Described coating fluid is prepared by pearl 8 is blended in the solvent forming material containing binding agent.
Described painting process (b) is the coating solution prepared the as described above operation at the back side of substrate layer 2.As the method being coated with described coating fluid, there is no particular limitation, it is possible to adopts known method, for instance can use slot coated method, rolling method, scraper for coating method, air knife coating method, flow coat method, gravure coating process, spraying process or stick coating method etc..
Described curing process (c) is the coating fluid irradiation ultraviolet radiation to the back side being coated on substrate layer 2, makes binding agent 7 solidify, and is formed and adheres to the operation preventing layer 6.When using ultraviolet curing resin as binding agent 7, in described curing process (c), binding agent 7 is made to solidify by irradiation ultraviolet radiation.As irradiating described ultraviolet method, it is possible to adopt well-known method, for instance low pressure mercury lamp, high-pressure mercury-vapor lamp, extra-high-pressure mercury vapour lamp, metal halide lamp, ultraviolet laser etc. can be adopted as the method for light source.
Back light unit
The common back light for liquid crystal display device unit (such as (a) of Fig. 3) that this light diffusing sheet 1 of described structure had been known that since in the past uses.Specifically, described back light for liquid crystal display device unit include light guide plate, to the light source of the end face irradiation light of light guide plate, overlap the described light diffusing sheet 1 on the surface of light guide plate and overlapping at the optical sheet such as prismatic lens and micro-lens sheet of face side of described light diffusing sheet 1.
Advantage
Owing to preventing layer 6 to be possible to prevent to adhere to light guide plate by adhesion, so described light diffusing sheet 1 is difficult to produce brightness disproportionation.In addition, adhere to and prevent layer 6 containing pearl 8 with using the ultraviolet curing resin binding agent 7 as main component, described pearl 8 is more soft than conventional acrylic acid pearl quality, so can prevent from rightly light guide plate is caused damage, the brightness disproportionation produced because of the damage of light guide plate therefore can be prevented rightly.
Especially because the polyamide series resin pearl 8 that use quality is softer, and making binding agent 7 is the binding agent with the ultraviolet curing resin comparing hard, therefore the binder film 7 of hard covers soft pearl 8, its result, even if to the protuberance external force action due to pearl 8, only leading section (top of rear side) as in the past can also be suppressed by conquassation, protuberance by entirety become flat in the way of deform, namely by section become oval in the way of deform.Therefore, even if the effect of this light diffusing sheet 1 has external force, contact area is also difficult to increase, and then frictional force is difficult to increase, it is possible to significantly increase the effect preventing that other optical components of rear side cause damage.
Additionally, by using acrylic resin as the main component of binding agent 7, excellent with the adhesive property of pearl 8, pearl 8 is difficult to depart from from binding agent 7, additionally, the coverlay 7a of binding agent 7 is also difficult to peel off from pearl 8.
Other embodiments
The liquid crystal display optical sheet of the present invention is not limited to described embodiment, can suitable design for change in the scope that the present invention is intended.That is, in said embodiment, for being illustrated with light diffusing sheet under the what is called in the surface configuration of light guide plate, but the liquid crystal display optical sheet of the present invention can also as prismatic lens, the face side being arranged in prismatic lens what is called on use light diffusing sheet.
Embodiment
By the examples below the present invention is specifically explained, but the invention is not restricted to below example.
Embodiment 1
Use the coating fluid that 0.118g nylon beads, 15gUV are obtained after solidifying resin, 0.481g antistatic additive and the mixing of 11g solvent, form adhesion and prevent layer, manufactured light diffusing sheet.The mean diameter of pearl is 5 μm.The coating weight of described coating fluid is 2g/m2。
Measuring the coefficient of kinetic friction at the light diffusing sheet back side (adhesion prevents layer) of described embodiment 1, its result is 0.272.
Comparative example 1
UV solidifies resin, antistatic additive and solvent use the material identical with embodiment 1, uses the coating fluid being mixed to get by they polydisperse polyurethane pearls with 0.118g, defines adhesion and prevent a layer shape.The mean diameter of polyurethane pearl is 7 μm.
Measuring the coefficient of kinetic friction at the back side (adhesion prevents layer) of the light diffusing sheet of described comparative example 1, its result is 0.415.
Owing to the coefficient of kinetic friction of the light diffusing sheet of described comparative example 1 is big, so when light diffusing sheet slides in light guide plate surface, the probability that the adhesive coverage film of bead surface is peeled off is significantly high, in contrast to this, the coefficient of kinetic friction of the light diffusing sheet of described embodiment 1 is little, and the probability of the rough sledding such as the coverlay stripping of generation binding agent is little.
Industrial applicibility
As mentioned above, the manufacture method of the liquid crystal display optical sheet of the present invention, the back light unit of liquid crystal indicator and liquid crystal display optical sheet, member of formation as liquid crystal indicator is useful, particularly can perform well in transmissive liquid crystal display device.
Claims (4)
1. a liquid crystal display optical sheet, comprising:
Transparent substrate layer；And
Adhesion prevents layer, is layered in the rear side of described substrate layer, and containing pearl and the binding agent covering described pearl, described liquid crystal display optical sheet is characterised by,
The main component of described pearl is polyamide series resin,
The scleroscopic D hardness of described pearl is less than more than 30 70,
The mean diameter of described pearl is more than 2 μm less than 20 μm,
The coefficient of alteration of described pearl is less than more than 0.05 1,
Described binding agent is made up of resin combination, described resin combination using ultraviolet curing resin as main polymer,
The content of described pearl is below more than 0.1 mass parts 5 mass parts relative to the resinous principle of the described binding agent of 100 mass parts.
2. liquid crystal display optical sheet according to claim 1, it is characterised in that
The pencil hardness at the back side of described binding agent is more than H below 2H.
3. liquid crystal display optical sheet according to claim 1, it is characterised in that
The average thickness that covers of the binding agent at the top of the rear side of described pearl is more than 0.1 μm less than 3 μm.
4. the back light unit of a liquid crystal indicator, it is characterised in that
Possesses the liquid crystal display optical sheet according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2012-288147 | 2012-12-28 | ||
| JP2012288147A JP6250278B2 (en) | 2012-12-28 | 2012-12-28 | Light diffusion sheet and backlight unit |
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| CN103913782A CN103913782A (en) | 2014-07-09 |
| CN103913782B true CN103913782B (en) | 2016-07-06 |
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| JP (1) | JP6250278B2 (en) |
| KR (1) | KR101605537B1 (en) |
| CN (1) | CN103913782B (en) |
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| JP6415598B2 (en) * | 2014-12-18 | 2018-10-31 | 堺ディスプレイプロダクト株式会社 | Display device |
| JP6647761B2 (en) * | 2015-12-07 | 2020-02-14 | 恵和株式会社 | Top light diffusion sheet and backlight unit |
| 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 |
| JP6678638B2 (en) * | 2017-12-28 | 2020-04-08 | 恵和株式会社 | Backlight unit and liquid crystal display device |
| KR20200128704A (en) * | 2018-03-07 | 2020-11-16 | 도판 인사츠 가부시키가이샤 | Optical film, optical barrier film, and backlight unit |
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| CN102073080A (en) * | 2009-11-18 | 2011-05-25 | 惠和株式会社 | Optical slice and backlight unit using it |
| CN102736144A (en) * | 2011-04-12 | 2012-10-17 | 惠和株式会社 | Light diffusion sheet, optical unit, backlight unit and liquid crystal display device |
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| JP4752169B2 (en) * | 2000-04-28 | 2011-08-17 | 東亞合成株式会社 | 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 |
| WO2006031043A1 (en) * | 2004-09-13 | 2006-03-23 | Skc Co., Ltd. | Reflection sheet and backlight unit employing the same |
| US20080196840A1 (en) * | 2004-12-20 | 2008-08-21 | Asahi Kasei Chemicals Corporation | Industrial Continuous Evaporation Apparatus |
| TWI406770B (en) * | 2005-02-21 | 2013-09-01 | Dainippon Printing Co Ltd | Anti-glare optical laminate |
| JP2008003514A (en) * | 2006-06-26 | 2008-01-10 | Keiwa Inc | Optical unit and liquid crystal display module |
| JP5301127B2 (en) * | 2007-09-04 | 2013-09-25 | 恵和株式会社 | LCD module |
| JP2010026222A (en) * | 2008-07-18 | 2010-02-04 | Jiroo Corporate Plan:Kk | Base sheet for optical sheet |
| JP6110051B2 (en) * | 2009-11-18 | 2017-04-05 | 恵和株式会社 | Optical sheet and backlight unit using the same |
| JP5819952B2 (en) * | 2011-05-26 | 2015-11-24 | 株式会社ダイセル | Transparent laminated film for display, method for using the same, and touch panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073080A (en) * | 2009-11-18 | 2011-05-25 | 惠和株式会社 | Optical slice and backlight unit using it |
| CN102736144A (en) * | 2011-04-12 | 2012-10-17 | 惠和株式会社 | Light diffusion sheet, optical unit, backlight unit and liquid crystal display device |
Also Published As
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| JP2014130234A (en) | 2014-07-10 |
| KR101605537B1 (en) | 2016-03-22 |
| KR20140086884A (en) | 2014-07-08 |
| JP6250278B2 (en) | 2017-12-20 |
| TWI519860B (en) | 2016-02-01 |
| TW201426110A (en) | 2014-07-01 |
| CN103913782A (en) | 2014-07-09 |
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