CN101957462A - Composite optical film - Google Patents
Composite optical film Download PDFInfo
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- CN101957462A CN101957462A CN2010102460105A CN201010246010A CN101957462A CN 101957462 A CN101957462 A CN 101957462A CN 2010102460105 A CN2010102460105 A CN 2010102460105A CN 201010246010 A CN201010246010 A CN 201010246010A CN 101957462 A CN101957462 A CN 101957462A
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Abstract
The invention provides a composite optical film, comprising a substrate, a light diffusion layer allocated on the substrate and a light concentration layer located on the light diffusion layer. The light diffusion layer comprises at least one microsphere and a jointing compound, the thickness of the light diffusion layer is 2-6 times the average particle size of the microsphere, and the distance between adjacent microspheres is smaller than the average particle size of the microsphere; and the light concentration layer is provided with at least one light contration microstructure. The composite optical film has favorable diffusion and light concentration functions, can effectively eliminate a Newton ring, not only can effectively enhance light ray application efficiency, but also has smaller thickness so as to ensure that the backlight module is easier to assemble.
Description
Technical field
The present invention relates to a kind of complex optical film, especially a kind of complex optical film that is applied to LCD.
Background technology
General LCD (Liquid Crystal Display; LCD) primary structure comprises panel and backlight module two large divisions.Wherein, pointolite (as light emitting diode) or line source (as fluorescent tube), light guide plate and various blooming piece have been comprised again as the backlight module of LCD light source.In the various assemblies of backlight module, the power consumption and the quantity of heat production thereof of pointolite or line source are maximum.Therefore, in order to keep even increase the brightness of LCD, the power consumption and the quantity of heat production thereof that how to reduce pointolite or line source just become an important problem.At present, in backlight module, utilize blooming miscellaneous, allow light source do the application of full blast, to improve the LCD panel luminance.This kind way need not changed any component design or be consumed additional energy source, has become the easiest most economical solution, for example, uses condensing film (light-gathering film) in backlight module.Condensing film (light gathering film) industry custom is called brightness enhancement film (brightness enhancement film) or prismatic lens (prism film), its major function is with ray-collecting at random by refraction and the effect of inner full-reflection, and be concentrated to positive visual angle (On-axis) light-emitting directions of degree approximately ± 35, to improve the briliancy of LCD.Because condensing film has regularly arranged optically focused microstructure, interfere or the phenomenon of diffraction via producing between the different light rays of different optical assembly refraction or reflection, cause LCD rainbow line (rainbow grain), light and shade line (light and shade stripes), repeatedly line (moir é) or Newton ring (Newton ' s ring) to occur.
In order to address the above problem; the method that industry adopts at present is to increase a slice protectiveness diffusion barrier (or being called diffusion barrier); to improve above-mentioned optical phenomena; but shortcoming is this kind goes up diffusion barrier (topdiffuser) price too expensive; and increase by a blooming; will increase backlight module thickness, backlight module is complicated, not meet frivolous trend.
Summary of the invention
In view of this, in order to solve the problems of the technologies described above, the purpose of this invention is to provide a kind of complex optical film, fully optically focused can be eliminated again and interfere or the diffraction phenomenon, needn't set up the protectiveness diffusion barrier in addition during use.
The technical solution that realizes the object of the invention is:
A kind of complex optical film, comprise a base material, be positioned at the light diffusion layer on the described base material and be positioned at a light collecting layer on the described light diffusion layer, described light diffusion layer comprises a plurality of microballon grains and a cement, the thickness of described light diffusion layer is 2～6 times of described microballon grain mean grain size, and the distance of adjacent described microballon intergranular is less than the mean grain size of described microballon grain; Described light collecting layer has a plurality of optically focused microstructures.
Further, above-described complex optical film, the mean grain size of wherein said microballon grain is 1～50 micron.
Further, above-described complex optical film, the mean grain size of wherein said microballon grain is 3～20 microns.
Further, above-described complex optical film, the refractive index of wherein said microballon grain is less than the refractive index of described light collecting layer, and the difference of the refractive index of the refractive index of described microballon grain and described light collecting layer is 0.02～0.4.
Further, above-described complex optical film, the microballon grain coating weight of wherein said light diffusion layer is 2.7～20g/cm
2
Further, above-described complex optical film, wherein said microballon grain is the microballon grain that per 100 weight portion cement solids add 80 to 210 weight portions with respect to the amount of cement solid.
Further, above-described complex optical film, the material of wherein said microballon grain is plastics, metal oxide, glass or its combination in any.
Further, above-described complex optical film, wherein said plastics are acryl resin, styrene resin, urethane resin, silicone resin or its combination in any.
Further, above-described complex optical film, the material of wherein said light collecting layer comprises ultraviolet curable resin.
Further, above-described complex optical film, wherein said ultraviolet curable resin are (methyl) acrylate resin, acrylated polyurethane resin, polyester acrylate resin, Epocryl or its combination in any.
Further, above-described complex optical film, the profile of wherein said optically focused microstructure is column structure, cone-shaped structure, cube corner structures, orange petal shape block structure, lentoid, capsule shape structure or its combination in any.
Further, above-described complex optical film, wherein said column structure are prism column structure, arc column structure or its mixing.
Further, above-described complex optical film, wherein said column structure are the prism column structure, and its drift angle angle is 40 degree～120 degree.
Again further, above-described complex optical film, wherein this complex optical film also comprises an anti-scratch layer on the bottom surface of described base material.
The technological merit of complex optical film provided by the invention is: this complex optical film can effectively be eliminated the rainbow line with preferable diffusion and light-focusing function, not only can effectively increase the light operation efficiency, and thickness is thinner, makes that the assembling of backlight module is more easy.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Figure 1A: the cross-sectional view of the complex optical film of one embodiment of the present invention;
Figure 1B: the cross-sectional view of the complex optical film of another embodiment of the present invention;
The enlarged diagram of the light diffusion layer 120 among Fig. 2: Figure 1A, Figure 1B;
The cross-sectional view of the embodiment of Fig. 3: Figure 1A;
Fig. 4: the cross-sectional view of the scanning electron microscope of comparative example 3 of the present invention;
Fig. 5: the cross-sectional view of the scanning electron microscope of comparative example 4 of the present invention;
Fig. 6: the cross-sectional view of the scanning electron microscope of embodiments of the invention 4;
Fig. 7: the cross-sectional view of the scanning electron microscope of embodiments of the invention 6.
Wherein:
100a, 100b, 300a, 300b: complex optical film;
110,310: base material;
120,320: light diffusion layer;
120a, 320a: cement;
120b, 320b: microballon grain;
130,330: light collecting layer;
330a: prism column structure;
140: anti-scratch layer;
D1, d2, d3: the distance of adjacent beads intergranular;
H: average thickness;
D: the spacing of adjacent prisms column structure;
Embodiment
Employed in this article term is not in order to restriction protection domain of the present invention only for describing described embodiment.Say it for example, employed term " " in the instructions, unless clear and definite explanation is arranged in the literary composition in addition, term " " is encompasses singular and most form.
In this article, " interior diffusion mist degree " is meant with refractive index (n) is that 1.55 glue is filled and led up the patterned surface of blooming, after solidifying, measures measured haze value (Hz) with JIS K7136 standard method again.
The present invention has disclosed a kind of complex optical film, comprise a base material, be positioned at the light diffusion layer on the described base material and be positioned at a light collecting layer on the described light diffusion layer, described light diffusion layer comprises a plurality of microballon grains and a cement, the thickness of described light diffusion layer is 2～6 times of described microballon grain mean grain size, and the distance of adjacent described microballon intergranular is less than the mean grain size of described microballon grain; Described light collecting layer has a plurality of optically focused microstructures.
The material of microballon grain described in the complex optical film of the present invention is plastics, metal oxide, glass or its combination in any, and wherein plastics are acryl resin, styrene resin, urethane resin, silicone resin or its combination in any.The mean grain size of microballon grain is 1～50 micron, is preferably 3～20 microns.
The material of light collecting layer comprises ultraviolet curable resin in the complex optical film of the present invention, and ultraviolet curable resin is (methyl) acrylate resin, acrylated polyurethane resin, polyester acrylate resin, Epocryl or its combination in any.The refractive index of microballon grain is less than the refractive index of described light collecting layer, and the difference of the refractive index of the refractive index of microballon grain and light collecting layer is 0.02～0.4.The microballon grain coating weight of light diffusion layer is 2.7～20g/cm
2, the microballon grain with respect to the content of cement solid constituent is: per 100 weight portion cement solids contain the microballon grain of 80 to 210 weight portions.
The profile of optically focused microstructure is column structure, cone-shaped structure, cube corner structures, orange petal shape block structure, lentoid, capsule shape structure or its combination in any in the complex optical film of the present invention.Wherein column structure is prism column structure, arc column structure or its mixing.Be preferably the prism column structure, and its drift angle angle is 40 degree～120 degree.
Complex optical film of the present invention also comprises an anti-scratch layer on the bottom surface of base material.
Below in conjunction with accompanying drawing and instantiation technical solution of the present invention is described in further detail.
Shown in Figure 1A, complex optical film 100a is followed successively by base material 110, light diffusion layer 120 and light collecting layer 130 from the bottom to top.For avoiding complex optical film of the present invention accidentally scratch or wearing and tearing in handling process, complex optical film of the present invention is optional to be used on the bottom surface of base material 110 and also to comprise an anti-scratch layer 140, shown in Figure 1B.In Figure 1B, complex optical film 100b is followed successively by anti-scratch layer 140, base material 110, light diffusion layer 120 and light collecting layer 130 from the bottom to top.
The thickness of base material 100 and refractive index depend on the demand of the required optical articles that makes usually.The thickness of base material 100 is generally 15～300 microns (μ m), and the material of base material 100 is preferably the high material of transparency, for example can be glass or resin.Base material 100 adoptable resin kinds, can select for use: vibrin (polyester resin), as polyethylene terephthalate (polyethylene terephthalate, PET) or Polyethylene Naphthalate (polyethylene naphthalate, PEN); Polyacrylate resin (polyacrylate resin), as polymethylmethacrylate (polymethylmethacrylate, PMMA); Polyolefin resin (polyolefin resin) is as tygon (PE) or polypropylene (PP); Poly-cyclic olefin resins (polycycloolefin resin); Polyimide resin (polyimide resin); Polycarbonate resin (polycarbonate resin); Urethane resin (polyurethane resin); Triafol T (triacetyl cellulose, TAC); PLA (polylactic acid) or its composition.Be preferably vibrin, polycarbonate resin or its composition; Be more preferred from polyethylene terephthalate.
As shown in Figure 2, be the enlarged diagram of the light diffusion layer among Figure 1A, Figure 1B 120.In Fig. 2, the surface of light diffusion layer 120 has concaveconvex structure, and its composition comprises cement 120a and a plurality of microballon grain 120b that are dispersed among the cement 120a.Light diffusion layer 120 utilizes microballon grain 120b different with the refractive index of cement 120a, increases the anaclasis phenomenon in the light diffusion layer 120, can overcome the problem of aforesaid rainbow line.
The material of cement 120a is preferably water white resin, can select for use but be not limited to: acrylate resin, polyamide, epoxy resin, fluoroplast, polyimide resin, urethane resin, alkyd resin (alkyd resin), vibrin or its potpourri are preferably acrylate resin, urethane resin, vibrin or its potpourri.According to one embodiment of the present invention, the refractive index of cement 120a is 1.40～1.60, is preferably 1.45～1.55.
According to causing the mode that composition in the cement carries out crosslinked and/or polyreaction, cement can be divided into heat curing (thermal setting) and radiation curing (radiation curing) two classes.The heat curing cement is meant that after being heated contained resinous principle can carry out the bond of cross-linking reaction in the cement.And the radiation curing cement, be meant the radiation energy of accepting specific wavelength after, contained resinous principle can carry out the cement of polymerization or cross-linking reaction in the cement.Above-mentioned radiation energy for example can be ultraviolet light or electron beam (E-beam curing), and the energy intensity of the required radiation energy of general ultraviolet light can be 1～500 millijoule/square centimeter (mJ/cm
2), be preferably 50～300 millijoule/square centimeters.
In above-mentioned cement 120a, can also add rigidizer, make it form crosslinked (crosslinking) in the intermolecular generation chemical bond of different resins.Above-mentioned rigidizer can be selected for use but be not limited to: diisocyanate (diisocyanate) or polyisocyanate (polyisocyanate).In addition, also can use commercially available rigidizer, as the Desmodur 3390 (trade name) of Bayer company.
The material of above-mentioned microballon grain 120b can be glass, metal oxide and plastics.Wherein metal oxide can be titania (TiO
2), silicon dioxide (SiO
2), zinc paste (ZnO), aluminium oxide (Al
2O
3), zirconia (ZrO
2) or its potpourri.Plastics can be acrylate resin, styrene resin, urethane resin, silicone resin or its potpourri.According to one embodiment of the present invention, the material of microballon grain 120b is acrylate resin, silicone resin or its combination.
The profile of above-mentioned microballon grain 120b there is no particular restriction, can be sphere, rhombus (rhombus), oval (elliptical), grain of rice shape (rice-grain-shaped) or biconvex lens shape (biconvex-shaped) etc., is preferably sphere.And the mean grain size of microballon grain 120b is about 1～50 micron, is preferably about 3～20 microns, better being about between 4～15 microns.
According to one embodiment of the present invention, the refractive index of microballon grain 120b is 1.3～2.5, is preferably 1.4～1.6.Penetrate effect in order to take into account good light diffusion effect and light in addition, the refractive index difference of microballon grain 120b and cement 120a is 0.01～0.4, is preferably 0.02～0.2.If the refractive index difference of microballon grain 120b and cement 120a is less than 0.01, then the light in light diffusion layer 120 reflects and the anaclasis deficiency, thereby reduces the effect of light diffusion.If the refractive index difference of microballon grain 120b and cement 120a is greater than 0.4, then the reflection of the light in light diffusion layer 120 is too much with anaclasis, can reduce the light transmittance of light diffusion layer 120 on the contrary.And, in order to avoid the light that is reflected by microballon grain 120b deflection normal (that is the refraction angle is less), reducing the effect of light diffusion, the refractive index of microballon grain 120b needs the refractive index less than base material 110.
For obtaining good light diffusion effect, the thickness of light diffusion layer 120 is more than the twice of microballon grain 120b mean grain size, make distance between adjacent beads grain 120b less than the mean grain size of microballon grain 120b, help microballon grain 120b and in light diffusion layer 120, can evenly closely arrange.In addition, the distribution scenario of microballon grain 120b in light diffusion layer 120 there is no particular restriction, can be even distribution of individual layer or multilayer and evenly distributes.Microballon grain 120b is preferably and is multilayer and evenly distributes, and when multilayer evenly distributed, the light refraction effect was preferable.
Distance between above-mentioned adjacent beads grain 120b refers on a section of light diffusion layer 120, and the minor increment between the adjacent beads grain 120b surface is shown in d1, the d2 of Fig. 2, d3.
According to one embodiment of the present invention, the thickness of light diffusion layer 120 is 2～6 times of microballon grain 120b mean grain size, and the distance between adjacent beads grain 120b is less than the mean grain size of microballon grain 120b, if the distance between adjacent beads grain 120b is too big, then incident ray can penetrate light diffusion layer 120 easily and can not pass through any one microballon grain 120b, will reduce the light diffusion effect of light diffusion layer 120.If the thickness of light diffusion layer 120 is more than 6 times of microballon grain 120b mean grain size, then the light penetration is on the low side, and briliancy is performed poor.Therefore, according to one embodiment of the present of invention, when the mean grain size of microballon grain was about 5 microns, the average thickness of light diffusion layer 120 was about more than 10 microns, was preferably 10～30 microns.
According to another embodiment of the invention, the distance between microballon grain 120b and the base material 110 is also less than the mean grain size of microballon grain 120b, to obtain preferable light diffusion effect.
The addition of microballon grain 120b also can influence the arrangement mode of microballon grain 120b in light diffusion layer 120, and the arrangement of microballon grain 120b is preferably multilayer and closely arranges equably, to obtain good light diffusion effect.According to one embodiment of the present invention, be as the criterion with the solid constituent content of cement 120a, the cement 120a of per 100 weight portions can add the microballon grain 120b of 80～210 weight portions.If the addition of microballon grain 120b very little, then the arrangement tight ness rating of microballon grain can be not enough, thereby reduce the effect of light diffusion.If the addition of microballon grain 120b is too many, then can allow the cement 120a in the light diffusion layer 120 contain quantity not sufficient, influence the adhesion between light diffusion layer 120 and the base material 110.In addition, the coating weight of light diffusion layer 120 also can influence the light diffusion effect of composite membrane simultaneously, and according to one embodiment of the present invention, the coating weight of light diffusion layer 120 is about 2.7～20g/cm
2, be preferably 3～13g/cm
2If coating weight is less than 2.7g/cm
2, then the microballon grain is piled up the degree deficiency, thereby reduces the light diffusion effect, if coating weight is greater than 20g/cm
2, then briliancy is performed poor on the contrary.
Above-mentioned column structure refers to be unimodal column structure or multimodal column structure.Unimodal column structure refers to be constituted and only had by single column structure the structure at single peak.Multimodal column structure at least two column structures formed structure set that overlaps each other that refers to serve as reasons, and the valley line height between any two adjacent column structures is for this reason in the two adjacent column structures 30%～95% of height junior height.
Above-mentioned linear column structure is defined as the column structure that the crest line (ridge) of column structure extends straight.
The crest line that the curve column structure is defined as column structure is bending change.Its bending prism unit has at least one crooked curved surface that extends, and the above-mentioned crooked curved surface that extends has suitable surface curvature change.Crooked surface curvature change of extending curved surface is to be 0.2%～100% of benchmark with above-mentioned curvilinear columns shape structure height, is preferably 1%～20%.
The crest line that the broken line column structure is defined as column structure is the column structure that broken line extends.
In general, the refractive index of light collecting layer is high more, the briliancy of the liquid crystal display picture height of can healing.The refractive index of light collecting layer 130 is at least 1.50, is preferably 1.52～1.65.Effect for the light diffusion that improves complex optical film 100a, 100b, according to one embodiment of the present invention, refractive index difference between light collecting layer 130 and microballon grain 120b is 0.02～0.4, if the refractive index difference of microballon grain 120b and light collecting layer 130 is less than 0.02, then anaclasis deficiency, thereby reduce the effect that light spreads.If the refractive index difference of microballon grain 120b and light collecting layer 130 is greater than 0.4, then the light reflection is too much with the phenomenon of anaclasis, can reduce the light transmittance of complex optical film on the contrary.
The material of above-mentioned light collecting layer 130 for example can be the cold coating after the sclerosis.The kind of above-mentioned cold coating for example can be thermosetting resin, radiation curing resin or its composition, is preferably light-cured resin.Above-mentioned cold coating optionally comprises light trigger, crosslinking chemical (crosslinking agent) and other adjuvant in addition.
According to one embodiment of the present invention, above-mentioned cold coating is formed can comprise ultraviolet curable resin (UV curable resin), light trigger and crosslinking chemical.The kind of the ultraviolet curable resin that is suitable for for example can be but is not limited to: (methyl) acrylic resin.The kind of above-mentioned (methyl) acrylic resin, for example: (methyl) acrylate resin, acroleic acid polyurethane (urethane acrylate) resin, polyester acrylate (polyester acrylate) resin, epoxy acrylate (epoxy acrylate) resin or its potpourri are preferably (methyl) acrylate resin.
The monomer of above-mentioned ultraviolet curable resin can be but is not limited to: epoxy diacrylate (epoxy diacrylate), halogenation epoxy diacrylate (halogenated epoxy diacrylate), methyl methacrylate (methyl methacrylate), isobornyl acrylate (isobomyl acrylate), 2-phenoxyethyl acrylate (2-phenoxy ethyl acrylate), acrylamide (acrylamide), styrene (styrene), halogenated styrenes (halogenated styrene), acrylic acid (acrylic acid), (methyl) vinyl cyanide ((meth) acrylonitrile), fluorene derivative diacrylate (fluorene derivative diacrylate), acrylic acid xenyl epoxy ethyl ester (biphenylepoxyethyl acrylate), halogenation acrylic acid xenyl epoxy ethyl ester (halogenated biphenylepoxyethyl acrylate), alkoxide epoxy diacrylate (alkoxylated epoxy diacrylate), alkyl halide oxidation epoxy diacrylate (halogenaed alkoxylated epoxy diacrylate), aliphatic urethane diacrylate (aliphatic urethane diacrylate), aliphatic polyurethane six acrylate (aliphatic urethane hexaacrylate), aromatic urethane six acrylate (aromatic urethane hexaacrylate), bisphenol-A epoxy diacrylate (bisphenol-A epoxy diacrylate), novolaks epoxy acrylate (novolac epoxy acrylate), polyester acrylate (polyester acrylate), polyester diacrylate (polyester diacrylate), the polyurethane of acrylate ended (acrylate-capped urethane) or its potpourri.Be preferably halogenation epoxy diacrylate, methyl methacrylate, 2-phenoxyethyl acrylate, aliphatic urethane diacrylate, aliphatic polyurethane six acrylate, aromatic urethane six acrylate or its potpourri.
Above-mentioned light trigger can be but is not limited to: benzophenone (benzophenone), diphenylhydroxyethanone (benzoin), benzil (benzil), 2,2-dimethoxy-1,2-diphenyl second-1-ketone (2,2-dimethoxy-1,2-diphenylethan-1-one), 1-hydroxycyclohexylphenylketone (1-hydroxy cyclohexyl phenyl ketone), 2,4,6-trimethylbenzene first anilide diphenyl phosphine oxide (2,4,6-trimethylbenzoyl diphenyl phosphine oxide; TPO) or its combination, be preferably benzophenone.
Above-mentioned crosslinking chemical for example can be has one or more functional group monomers or oligomer, is preferably to have multiple functional radical monomer or oligomer, can effectively improve the glass transition temperature of cold coating.The kind of above-mentioned crosslinking chemical can be but is not limited to: (methyl) acrylate; Urethane acrylate (urethane acrylate) is as aliphatic urethane acrylate (aliphatic urethane acrylate), aliphatic polyurethane six acrylate (aliphatic urethane hexaacrylate) or aromatic urethane six acrylate (aromatic urethane hexaacrylate); Polyester acrylate (polyester acrylate) is as polyester diacrylate (polyester diacrylate); Epoxy acrylate (epoxy acrylate) is as bisphenol-A epoxy diacrylate (bisphenol-A epoxy diacrylate); Phenolic aldehyde epoxy acrylate (novolac epoxy acrylate); Or its potpourri.
Above-mentioned (methyl) acrylate can have two or more functional groups, be preferably (methyl) acrylate that has multiple functional radical, the example that is applicable to (methyl) of the present invention acrylate is including but not limited to tripropylene glycol two (methyl) acrylate (tripropylene glycol di (meth) acrylate), 1,4-butylene glycol two (methyl) acrylate (1,4-butanediol di (meth) acrylate), 1,6-hexanediol two (methyl) acrylate (1,6-hexanediol di (meth) acrylate), polyglycol two (methyl) acrylate (polyethyleneglycol di (meth) acrylate), allylation two (methyl) cyclohexyl acrylate (allylated cyclohexyl di (meth) acrylate), two (methyl) acrylic acid isocyanuric acid ester (isocyanurate di (meth) acrylate), ethoxylated trimethylolpropane three (methyl) acrylate (ethoxylated trimethylol propane tri (meth) acrylate), propoxylated glycerol three (methyl) acrylate (propoxylated glycerol tri (meth) acrylate), trimethylolpropane tris (methyl) acrylate (trimethylol propane tri (meth) acrylate), three (propylene oxygen ethyl) isocyanic acid urea ester (tris (acryloxyethyl) isocyanurate) or its potpourri.
Available commercially available containing, the crosslinking chemical of (methyl) acrylate can be: produced by Sartomer company, commodity are by name
Or
Produced by Eternal company, commodity are called 624-
Or by UCB. S.A.'s production, commodity are called Ebecryl
Ebecryl
Ebecryl
Or Ebecryl
In addition, in above-mentioned cold coating, can also add inorganic powder.The advantage of adding inorganic powder is subsided to avoid light collecting layer 130 lip-deep optically focused microstructures for increasing the hardness after cold coating solidifies, and influences the optical property of light collecting layer 130.The interpolation inorganic powder can also promote the briliancy (brightness) of liquid crystal display picture.Above-mentioned inorganic powder can be but is not limited to: zinc paste, silicon dioxide, strontium titanates, zirconia, aluminium oxide, lime carbonate, titania, calcium sulphate, barium sulphate or its potpourri are preferably titania, zirconia, silicon dioxide, zinc paste or its potpourri.According to one embodiment of the present invention, the particle size of inorganic powder can be 10～350 nanometers, is preferably 50～150 nanometers.
Above-mentioned light collecting layer 130 also can directly be taken commercially available condensing film.Commercially available condensing film can be BEF 90HP or BEF II 90/50 condensing film produced by Sumitomo 3M company, or the DIA ART that is produced by Mitsubishi Rayon company
Or P210 condensing film.
Above-mentioned complex optical film is measured total light transmittance and is not less than 60% according to JIS K7136 standard method.As discussed previously, above-mentioned complex optical film is measured according to JIS K7136 standard method, has to be not less than 5% interior diffusion mist degree, is preferably the interior diffusion mist degree that has between 5%～80%.The prepared complex optical film of the present invention, the surface impedance of its microstructured layers and anti-scratch layer all is lower than 10
13Ω/ is preferably 10
8～10
12Ω/ (Ω/ represent ohm/meter square).
The preparation of complex optical film of the present invention
At first, on base material 110, form light diffusion layer 120, the method that the method for formation can be coating, spraying or fits.With the coating is example, the coating that contains microballon grain 120b and cement 120a can be coated on the base material 110.The coating number of times of above-mentioned coating process does not have particular restriction, can the single or multiple coating.A little flowability before wherein repeatedly coating can utilize coating not dried, the microballon grain 120b that makes way for the upper strata fills up formed depression between the microballon grain 120b that is positioned at lower floor, to improve the tight ness rating that microballon grain 120b arranges, can also improve the thickness of light diffusion layer 120.
Then, on light diffusion layer 120, form light collecting layer 130, the formation method can be direct applying or coating, and above-mentioned coating process can be: slit coating (slit die coating), nick version printing coating (micro gravure coating) or roller coating (roller coating).If use commercially available condensing film to form light collecting layer 130, then one or more condensing films directly can be fitted in the top of light diffusion layer 120, finish the combination of 120 of light collecting layer 130 and light diffusion layers.Form light collecting layer 130 if use cold coating, then can utilize volume to volume formula (roll to roll) production technology continuously, cold coating directly is coated on the top of light diffusion layer 120, treat its sclerosis after, just finish the combination of 120 of light collecting layer 130 and light diffusion layers.
If will make the complex optical film 100b of Figure 1B, also need on the bottom surface of base material 110, form anti-scratch layer 140.The formation method of anti-scratch layer 140 is coated on after base material 110 goes up with respect to another surface of light diffusion layer for the coating fluid with heat curing or light-cured resin, utilizes the mode of heating or irradiation to solidify coating fluid, finishes the making of anti-scratch layer 140.
Specific embodiment
As Fig. 3, be the cross-sectional view of the embodiment of Figure 1A.
In Fig. 3, complex optical film 300a has base material 310, light diffusion layer 320 and light collecting layer 330 from the bottom to top in regular turn.Light diffusion layer 320 is made up of the coating with concave-convex micro-structure, and the average thickness of light diffusion layer 320 is H.Coating at light diffusion layer 320 contains cement 320a and microballon grain 320b.
Above-mentioned prism column structure is to be formed in roof intersection by two inclined surfaces, and above-mentioned inclined surface can be curved surface or plane, and above-mentioned two inclined surfaces can be separately intersect in the bottom with another inclined surface of adjacent prisms column structure and form paddy.If the roof intersection place passivation of above-mentioned two inclined surfaces forms a curved surface, then can be called the arc column structure again.
Above-mentioned complex optical film can use in light source device, for example advertising lamp box, flat-panel screens or LED light fixture etc., especially can use in the backlight module of straight-down negative,, can effectively eliminate rainbow line phenomenon as blooming with even light and optically focused complex function.
Following examples and comparative example will at complex optical film of the present invention with and preparation method thereof further instruction is provided.
(Eternal company produces with certain proportion mixing cement, commodity are called Eterac 5054-ts-40, refractive index 1.48), (Sekisui company produces the microballon grain, commodity are called SR0365, the about 5 μ m of mean grain size, refractive index 1.49), rigidizer (Bayer company produces, and commodity are called Desmodur 3390) and solvent (ethyl acetate: butyl acetate=1: 1), mix the light diffusion layer coating of the clear of about 100 grams of solid 25Wt% and gross weight.Then with paint daubs with light diffusion layer coating be coated on the clear PET film that thickness is 188 μ m (
Toray company, refractive index 1.62) on the side surface.After treating the coating drying, promptly on base material, form light diffusion layer.
Then, coating acryl resin coating on the light diffusion layer surface again in the mode of roller embossing, forms the light collecting layer of tool prism pattern structure on the acryl resin coating.Utilize high-energy ultraviolet ray (UV) to solidify acryl resin coating (refractive index 1.57) then, finish the manufacturing of complex optical film.
Above-mentioned complex optical film can be taken the structure that its sectional view (cross section) is analyzed complex optical film by scanning electron microscope (SEM), the thickness of light collecting layer wherein, for the prism apex of light collecting layer to the distance between the prism bottom.
The thickness of light diffusion layer then relies on following calculating formula and gets: the prism apex of the thickness=light collecting layer of light diffusion layer is to the thickness of the distance-light collecting layer of substrate surface.
Use the complex optical film of said method manufacturing, change microballon grain and the weight ratio (B/B value) of cement and the coating weight (g/m of light diffusion layer in the light diffusion layer respectively
2), form embodiment 1 to embodiment 6 and comparative example 3 to comparative example 6, each change value such as following table one.
And unlisted in Table 1 comparative example 1 and comparative example 2 are respectively commercially available diffusion barrier (DI700, Eternal company) and commercially available brightness enhancement film (PF972, Eternal company).The light diffusion layer that the structure of the commercially available diffusion barrier of comparative example 1 is formed for the cement that has the microballon grain in base material one side, but light collecting layer is not set.Light diffusion layer in the commercially available structure of reflection reducting coating of comparative example 2 is made up of the cement with microballon grain, but its light diffusion layer is the relative both sides that lay respectively at base material with light collecting layer, rather than homonymy.
Table one: embodiment 1 to embodiment 6 and comparative example 3 are to comparative example 6
The test of embodiment and comparative example
Embodiment and comparative example are tested, comprise the test of light and shade line, briliancy and rainbow line.
At first, assemble first test structure.First test structure has contained a slice diffusion barrier (model DI-700, Eternal company produces) for the blooming with the various embodiments described above and each comparative example is disposed on the backlight module of 10.1 inches Eee PC (Hewlett-Packard Corporation's manufacturing) in the backlight module of former EeePC.
The BM-of briliancy method of testing for providing with TOPCON company
Instrument carries out the briliancy test to first test structure.And light and shade line method of testing serve as reasons positive visual angle up and down the four directions each in 45 °, the blooming of first test structure is carried out visual examination, observe the light and shade line.
Then, assemble second test structure.Second test structure is for covering the face glass of bright of one deck again on first test structure.Rainbow line method of testing serve as reasons positive visual angle up and down each 30 degree or about in each 45 degree, rainbow line test structure is carried out visual examination, observe the rainbow line.Above-mentioned test result is shown in following table two.
By following test result as can be known, use the comparative example 1 of known diffusion barrier, though do not have light and shade line and rainbow line, its briliancy is performed poor.And use the comparative example 2 of known brightness enhancement film, though briliancy is higher, the problem of rainbow line is arranged but.
Embodiment 1 to embodiment 6 is to use the complex optical film that is combined by optical diffusion film and condensing film with comparative example 3 to comparative example 6, light diffusion layer thickness/microballon grain mean grain size excessive (6.46) except comparative example 6, cause briliancy performed poor outside, other all has positive influences to briliancy.
In addition, the accumulating amount deficiency (light diffusion layer thickness/microballon grain mean grain size be 1.91) of the microballon grain of comparative example 3 in light diffusion layer can't solve the problem of light and shade line and rainbow line.Though comparative example 4 and comparative example 5 are more than enough with the accumulating amount (light diffusion layer thickness/microballon grain mean grain size) of microballon grain in light diffusion layer of embodiment 1 to embodiment 6, but, the microballon grain maximum spacing of embodiment 1 to embodiment 6 is less than microballon grain mean grain size, and the microballon grain maximum spacing of comparative example 4～5 is greater than microballon grain mean grain size.
Whether the microballon grain enough closely arranges the microballon grain accumulating amount whether more than enough (ratio of light diffusion layer thickness/microballon grain mean grain size) in (maximum spacing of microballon grain/mean grain size ratio) and the light diffusion layer in the The above results display light diffusion layer, can influence the performance of light and shade line and rainbow line.
Table two: embodiment and comparative example are to the test result of briliancy, light and shade line and rainbow line
In Table 1, microballon grain/cement weight ratio of comparative example 6, embodiment 5 and embodiment 6 is all 2.0, but the excessive (32.5g/m of the coating weight of the light diffusion layer of comparative example 6
2), cause briliancy (table two) is performed poor.
Microballon grain/cement weight ratio of comparative example 5, embodiment 1 and embodiment 2 is all 0.9, but the coating weight of its light diffusion layer increases (2.5g/m in regular turn
2, 4.8g/m
2, 10.1g/m
2), the ratio of its light diffusion layer thickness/microballon grain mean grain size also increases (2.17,2.98,3.48) in regular turn.The result is during to the maximum embodiment 2 of coating weight, and the light and shade line has not had.5 problems that tangible light and shade line is arranged of comparative example that coating weight is minimum.Similarly, microballon grain/cement weight ratio is all 1.2 embodiment 3, embodiment 4, and its light diffusion layer coating weight is respectively 2.9g/m
2, 10.5g/m
2, and the ratio of light diffusion layer thickness/microballon grain mean grain size is respectively 2.57,3.96, also presents identical phenomenon.Whether the microballon grain content of demonstration in light diffusion layer coating is more than enough (microballon grain/cement weight ratio), the coating weight of light diffusion layer must more than enough (ratio of light diffusion layer thickness/microballon grain mean grain size), could solve the problem of light and shade line and rainbow line fully.
By Fig. 4 and Fig. 5 the comparative example 3 that shows respectively and scanning electron microscope (SEM) figure of comparative example 4, can find out since light diffusion layer in microballon grain content very little, make the microballon grain closely to arrange, and make comparative example 3 and comparative example 4 that serious light and shade line and rainbow line problem be arranged.Wherein, though the coating weight of comparative example 4 is enough, have quite thick light diffusion layer, the microballon grain condenses mutually in light diffusion layer and causes skewness.Distinguish scanning electron microscope (SEM) figure of shown embodiment 4, embodiment 6 by Fig. 6 and Fig. 7, the microballon grain of light diffusion layer is all tight arrangement as can be seen, the thickness of adding light diffusion layer is thicker, therefore can obtain outstanding performance in the project of rainbow line and light and shade line.
Though the present invention discloses as above with embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (14)
1. complex optical film, it is characterized in that: comprise a base material, be positioned at the light diffusion layer on the described base material and be positioned at a light collecting layer on the described light diffusion layer, described light diffusion layer comprises at least one a microballon grain and a cement, the thickness of described light diffusion layer is 2～6 times of described microballon grain mean grain size, and the distance of adjacent described microballon intergranular is less than the mean grain size of described microballon grain; Described light collecting layer has at least one optically focused microstructure.
2. complex optical film according to claim 1 is characterized in that: the mean grain size of described microballon grain is 1～50 micron.
3. complex optical film according to claim 1 is characterized in that: the mean grain size of described microballon grain is 3～20 microns.
4. complex optical film according to claim 1 is characterized in that: the refractive index of described microballon grain is less than the refractive index of described light collecting layer, and the difference of the refractive index of the refractive index of described microballon grain and described light collecting layer is 0.02～0.4.
5. complex optical film according to claim 1 is characterized in that: the microballon grain coating weight of described light diffusion layer is 2.7～20g/cm
2
6. complex optical film according to claim 1 is characterized in that: described microballon grain is that per 100 weight portion cement solids add the microballon grain of 80 to 210 weight portions with respect to the use amount of cement.
7. complex optical film according to claim 1 is characterized in that: the material of described microballon grain is plastics, metal oxide, glass or its combination in any.
8. complex optical film according to claim 7 is characterized in that: described plastics are acryl resin, styrene resin, urethane resin, silicone resin or its combination in any.
9. complex optical film according to claim 1 is characterized in that: the material of described light collecting layer comprises ultraviolet curable resin.
10. complex optical film according to claim 9 is characterized in that: described ultraviolet curable resin is (methyl) acrylate resin, acrylated polyurethane resin, polyester acrylate resin, Epocryl or its combination in any.
11. complex optical film according to claim 1 is characterized in that: the profile of described optically focused microstructure is column structure, cone-shaped structure, cube corner structures, orange petal shape block structure, lentoid, capsule shape structure or its combination in any.
12. complex optical film according to claim 11 is characterized in that: described column structure is prism column structure, arc column structure or its mixing.
13. complex optical film according to claim 11 is characterized in that: described column structure is the prism column structure, and its drift angle angle is 40 degree～120 degree.
14. complex optical film according to claim 1 is characterized in that: this complex optical film also comprises an anti-scratch layer on the bottom surface of described base material.
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| CN2010102460105A CN101957462A (en) | 2010-08-05 | 2010-08-05 | Composite optical film |
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| 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 |
| CN105301826A (en) * | 2015-10-14 | 2016-02-03 | 宁波长阳科技有限公司 | Brightness enhancement film applied in large-size display |
| CN106233166A (en) * | 2014-04-21 | 2016-12-14 | 松下知识产权经营株式会社 | Optics and illuminating cover |
| CN106526973A (en) * | 2016-12-30 | 2017-03-22 | 深圳Tcl新技术有限公司 | Straight down type backlight module and liquid crystal display device |
| CN107179573A (en) * | 2017-06-19 | 2017-09-19 | 张家港康得新光电材料有限公司 | Composite membrane and preparation method thereof |
| CN110119006A (en) * | 2018-07-25 | 2019-08-13 | 湖北费米拉曼光电科技有限公司 | A kind of guide-lighting diffusion integrated board and preparation method |
| CN111108324A (en) * | 2017-09-20 | 2020-05-05 | 株式会社Lms | Integrated optical sheet module and backlight unit having the same |
| CN115079320A (en) * | 2022-07-25 | 2022-09-20 | 青岛国骐光电科技有限公司 | Diffusion plate, application and preparation method thereof, backlight module and display module |
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| 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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| CN105301826A (en) * | 2015-10-14 | 2016-02-03 | 宁波长阳科技有限公司 | Brightness enhancement film applied in large-size display |
| CN106526973A (en) * | 2016-12-30 | 2017-03-22 | 深圳Tcl新技术有限公司 | Straight down type backlight module and liquid crystal display device |
| CN107179573A (en) * | 2017-06-19 | 2017-09-19 | 张家港康得新光电材料有限公司 | Composite membrane and preparation method thereof |
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| CN110119006A (en) * | 2018-07-25 | 2019-08-13 | 湖北费米拉曼光电科技有限公司 | A kind of guide-lighting diffusion integrated board and preparation method |
| CN110119006B (en) * | 2018-07-25 | 2021-08-27 | 湖北费米拉曼光电科技有限公司 | Light guide diffusion integrated plate and preparation method thereof |
| CN115079320A (en) * | 2022-07-25 | 2022-09-20 | 青岛国骐光电科技有限公司 | Diffusion plate, application and preparation method thereof, backlight module and display module |
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