CN101762904A - Optical film compound - Google Patents
Optical film compound Download PDFInfo
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- CN101762904A CN101762904A CN200910206885A CN200910206885A CN101762904A CN 101762904 A CN101762904 A CN 101762904A CN 200910206885 A CN200910206885 A CN 200910206885A CN 200910206885 A CN200910206885 A CN 200910206885A CN 101762904 A CN101762904 A CN 101762904A
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Abstract
The invention provides an optical film compound, comprising a brightening element and a diffused element, wherein the diffused element comprises a substrate at least one side of which comprises an optical diffusing layer; and the diffused element has no lower than 98% of haze measured according to a JIS K7136 standard method.
Description
Technical field
The present invention relates to optical film compound, particularly be applied to direct type backlight module, particularly the optical film compound of direct-light type LED backlight module.
Background technology
LCD (Liquid Crystal Display, LCD) have superiority such as high image quality, low radiation, low consumpting power, preferable space utilization because of it, replace original cathode-ray tube (CRT) (Cathode-Ray Tube, CRT) display and become the market mainstream gradually.The primary structure of LCD comprises liquid crystal panel and backlight module two large divisions, because liquid crystal panel itself is not luminous, therefore need backlight module (Back light module) to provide the liquid crystal display displays image required light source, so that its normal show image.
One of light source that backlight module is commonly used be cold cathode fluorescent lamp (Cold Cathode FluorescentLamp, CCFL).In direct type backlight module, fluorescent tube is to be disposed at the liquid crystal panel below in mode side by side, if suitably with light diffusion and homogenize, very easily because of the light intensity distributions inequality, causes occurring tangible fluorescent tube profile on the indicator screen, reduces image display quality.Moreover, when high more or display sizes is big more when the brightness demand, required fluorescent tube number the more, the light and shade fringe phenomena that is then occurred is more serious.Therefore, become a great development bottleneck in LCD field.
The light source that another kind can be used for backlight module be light emitting diode (Light EmittingDiode, LED).Because light emitting diode has low power consumption, high brightness and advantage such as pollution-free, therefore, uses the backlight module of light emitting diode as light source, has become one of at present important research and development direction.Yet, because light emitting diode is pointolite and directive property height, is easy to generate firefly effect (hot spot), therefore, adopt light emitting diode as the backlight module of light source if, be easy to generate the phenomenon of brightness irregularities (Mura) suitably with light diffusion and homogenize.At one of settling mode of this problem is to increase LED quantity the spacing of LED is reduced, this mode can significantly increase because of LED quantity, make whole cost increase and be easy to generate too much heat, and then influence the life-span and the quality of other material, power consumption simultaneously is excessive, can't satisfy many portable apparatus and need be dependent on the requirement that battery provides electric power.
In general, backlight module is divided into direct type backlight module (direct type back lightmodule) and lateral incident type backlight module (side type back light module).Therefore compared to the lateral incident type backlight module, direct type backlight module can provide higher brightness, when to the brightness demand height of light source or when being applied to the large-sized monitor device, adopts direct type backlight module usually.In addition, the direct-light type LED backlight module uses the zone to light (local dimming) technology, power saving more, reach the environmental protection demand, but for solving the firefly phenomenon, the distance that often needs to increase light source and other diaphragm to be providing enough light mixing distance, but can increase the thickness of backlight module, is unfavorable for the demand that present display is light, thin.
Summary of the invention
In view of this, the present application people finds through broad research with after testing repeatedly, a kind of diffused component of high diffusion and optical film compound of blast element of comprising can allow the direct-light type LED backlight module of large-sized monitor, must not increase light mixing distance, can reach the purpose of light uniformization, can keep briliancy again, and processing procedure is simple, the yield height, easy to use, can effectively solve the aforesaid drawbacks.
Fundamental purpose of the present invention is that a kind of optical film compound is provided, and it comprises a blast element; With a diffused component, wherein this diffused component comprises a base material and at least one side of this base material comprises a light diffusion layer, and this diffused component has according to JIS K7136 standard method and records and be not less than 98% mist degree.
Optical film compound of the present invention has the effect of even light, can effectively spread light, solves the phenomenon of brightness irregularities (Mura), thereby preferable development quality can be provided.
Description of drawings
Fig. 1 records the luminosity figure (Fig. 1 a: incident angle 0-40 °, Fig. 1 b: incident angle 50-80 °) of diffused component 2 of the present invention for showing automatic goniophotometer
Fig. 2 to Figure 20 is the synoptic diagram of the better embodiment of optical film compound of the present invention.
The main element symbol description
10 light harvesting films
11 base materials
12 optical structure layers
121 prism column structures
122 arc column structures
123 lentoids
20 diffused components
21 base materials
22 concave-convex micro-structure layers
30 intermediate members
50 multiple fields reflection polarisation reclamation film
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.
The used blast assembly of the present invention there is no particular restriction, mainly is in order to promoting light utilization efficiency to reach the effect of blast, and it can be the known blast assembly of any persond having ordinary knowledge in the technical field of the present invention.Generally speaking, the blast element can be divided into four big classes.The first kind is the light harvesting film, its principle is to utilize an optical structure layers, by the special optical structure incident light is controlled its rising angle through refraction and/or through inner full-reflection, allow and concentrate, reduce the light coefficient of losses towards light at random from all directions originally, and reach the purpose that increases brightness.The example of commercially available light harvesting film comprises: 3M, model BEF (Brightness Enhancement Film); New and (SHINWHA) company, model PTR-763; Jia Wei, model HGP210; LG chemistry (LG Chemical), model LSF-451B or mitsubishi rayon (Mitsubishi Rayon), model M268Y.Second class is a multiple field reflection polarisation reclamation film, and its principle is to utilize the macromolecular material of two kinds of different refractivities to form multi-layer film structure with extrusion technology altogether, again via extending the characteristic that produces birefraction.When light source passes through, the polarisation of vertical direction can directly penetrate, and the polarisation of parallel direction will be reflected back toward backlight module, again the polarisation that forms vertical direction more after reflection is to penetrate this multiple field reflection polarisation reclamation film, promote the effect that light utilization efficiency provides blast by this and reach, the example of commercially available multiple field reflection polarisation reclamation film comprises:: 3M, model DBEF-D2-280.The 3rd class is an optical activity nematic crystal brightness enhancement film, its principle is a kind of reflective blast technology, mainly be when the light source of backlight module passes through this optical activity nematic crystal (Chiral-Nematic) layer, have only the rotatory polarization opposite to pass through with the liquid crystal molecule helical structure, the relative rotatory polarization identical with the liquid crystal molecule helical structure then will be reflected back toward backlight module, again form the rotatory polarization opposite more after reflection to penetrate this optical activity nematic crystal layer with the liquid crystal molecule helical structure, and reaching the effect that the method that promotes light utilization efficiency provides blast by this, the example comprises: the cholesterol liquid crystal brightness enhancement film.The 4th class is wire grating polaroid (Wire-grid Polarizer, WGP), utilize the nano-micro structure of width less than optical wavelength, make light enter the back and produce the polarization phenomenon, arrange in pairs or groups again behind the suitable optical element, can be in order to recycling (recycling) polarized light, and reach the effect that the method that promotes light utilization efficiency provides blast by this.Blast element used in the present invention is preferably light harvesting film or multiple field reflection polarisation reclamation film; Be more preferred from the light harvesting film.
Light harvesting film of the present invention comprises a base material and and is positioned at optical structure layers on this base material.The kind of above-mentioned base material can be any the technical field of the invention have general knowledge person institute well known, for example glass or plastics.Above-mentioned plastic basis material can be made of one or more polymer resin layer.Kind in order to the resin that constitutes above-mentioned polymer resin layer there is no particular restriction, it is such as but not limited to vibrin (polyester resin), as polyethylene terephthalate (polyethylene terephthalate, PET) or PEN (polyethylenenaphthalate, PEN), polyacrylate resin (polyacrylate resin), as polymethylmethacrylate (polymethyl methacrylate, PMMA), polyolefin resin (polyolefin resin), 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) and combination thereof.Be preferably and be selected from vibrin, polycarbonate resin and combination thereof; Better is polyethylene terephthalate.The thickness of above-mentioned base material depend on usually the demand of the optical articles desiring to make, be generally about 15 microns to about 300 microns.
Generally speaking, the refractive index of light harvesting film is high more, and the light harvesting effect is good more, and the luminance gain effect is good more.The refractive index of the light harvesting film that the present invention is used there is no particular restriction, is generally about 1.49 to about 1.65.The optical structure layers of light harvesting film of the present invention comprises a plurality of microstructures that the light harvesting effect is provided.The form of above-mentioned microstructure there is no particular restriction and is the person institute well known that has the general knowledge in the technical field of the invention, and it is such as but not limited to column structure, cone-shaped structure, cube corner structures, orange petal shape block structure, lentoid and capsule shape structure or its combination etc.Be preferably column structure, these column structures can be linearity (linear), curve (serpentine) or broken line (zigzag), and two adjacent column structures can be parallel or not parallel, and the peak heights of these column structures can not change or change along bearing of trend along bearing of trend.The peak heights of above-mentioned column structure along bearing of trend change be meant the height that has the part position in this column structure at least be at random or systematicness change along the structure main spindle's, its amplitude of variation is at least 3 percent of nominal height (or average height), and preferable its amplitude of variation is 50 5 percent to percent of this nominal height.
Column structure used in the present invention can be contour or not contour, wide or not wide, and above-mentioned column structure can be unimodal column structure, multimodal column structure or its combination.Above-mentioned unimodal column structure and multimodal column structure are preferably symmetrical column structure, use symmetrical column structure not only can simplify job operation and light harvesting effect more easy to control.
Column structure used in the present invention can be prism column structure or arc column structure or its combination, is preferably the prism column structure.When column structure was arc, the radius-of-curvature of arc column top curve surface highest point was about 2 microns to about 50 microns, was preferably about 3 microns to about 35 microns, for taking into account anti-scratch and high briliancy characteristic, was more preferred from about 5 microns to about 12 microns.The drift angle angle of prism column structure used in the present invention or arc column structure can be mutually the same or inequality.The drift angle angle of prism column structure is about 40 ° to about 120 °, is preferably about 80 ° to about 120 °, and the drift angle of arc column structure is about 40 ° to about 120 °, is preferably about 60 ° to about 110 °.
Be to reduce the optical interference phenomenon, the optical structure layers of light harvesting film of the present invention is preferable to comprise at least two uneven each other column structures.According to the present invention, this optical structure layers comprises at least one group of uneven two column structures that intersected and/or at least one group of uneven two column structures that do not intersect.
The optical structure layers of light harvesting film of the present invention can be used the known any way preparation of the person that has the general knowledge in the technical field of the invention, for example: can prepare in integrally formed mode with base material, for example make with impression (embossing), the modes such as (injection) that penetrates; Or with the continuous production technology coating composition on base material of volume to volume formula (roll to roll), solidify to form and have a plurality of optical structure layers that the microstructure of light harvesting effect is provided, the thickness of above-mentioned optical structure layers there is no particular restriction, usually have about 1 micron to about 50 microns thickness, be preferably about 5 microns to about 35 microns, the best is about 15 microns to about 25 microns.
According to a better embodiment of the present invention, the formation method of light harvesting film of the present invention is with the continuous production technology of volume to volume formula, in base material one side coating composition, behind the roller engraving, be solidified to form this and have a plurality of optical structure layers that the microstructure of light harvesting effect is provided.Above-mentioned coating there is no particular restriction, and can be any is the person institute well known that has the general knowledge in the technical field of the invention, such as but not limited to ultraviolet curing resin.The kind of above-mentioned ultraviolet hardening resin also is a persond having ordinary knowledge in the technical field of the present invention institute well known, such as but not limited to, acrylate resin (acrylate resin), methacrylate resin (methyl acrylate resin), urethane acrylate (urethane acrylate) resin or epoxy acrylate (epoxy acrylate) resin.
Diffused component used in the present invention is the diffusion barrier of a high diffusibility, standard method records and is not less than 98% mist degree (haze) according to JIS K7136, standard method records and is not less than that 60% total light transmittance comprises a base material and at least one side of this base material comprises a light diffusion layer according to JIS K7136, for obtaining higher mist degree, optionally, these base material both sides respectively comprise a light diffusion layer, the kind of above-mentioned base material is as described earlier in this article, the preferably is a transparent base, and the diffused component integral thickness is about 50 microns～400 microns, is preferably 200 microns～300 microns.Diffusion component of the present invention has the optical characteristics of high diffusion, therefore, when light passes through diffusion component, the approximate perfect scattering of light source can be diffused into uniform surface light source, and the situation of eliminating lamp source light and shade line (lampmura) by this produces.
On the other hand, diffused component of the present invention is because of possessing the effect of similar bright Bert (Lambertian) diffusion, so have high all optical characteristics of neat degree, use goniophotometer to detect diffused component of the present invention, during with the projection of-90 ° to 90 ° incident angles, record out the strongest angle of light intensity and be ± 10 ° with interior (shown in Fig. 1 a and 1b).Therefore, diffused component of the present invention can become the light of vertical diffusion component orientation with the exhausted most correcting of the light of all angles incident and penetrate.In other words, though the light inlet of any angle all can control it and go out the strongest angle of light intensity in ± 10 ° by diffused component of the present invention, so diffused component of the present invention has the equal homogeneous effect of light, easier elimination lamp source light and shade line phenomenon.
According to an embodiment of the present invention, the side (incidence surface or exiting surface) that this diffused component comprises a base material and this base material comprises a light diffusion layer.According to another embodiment of the present invention, the both sides (incidence surface and exiting surface) that this diffused component comprises a base material and this base material all comprise light diffusion layer.
Light diffusion layer of the present invention is by forming the concave-convex micro-structure layer on the incidence surface of base material, exiting surface or two sides and making.The formation method of above-mentioned concave-convex micro-structure layer there is no particular restriction, is to be familiar with this operator to know, and it is such as but not limited to screen painting, spraying or embossing processing.Preferable mode is the resinous coat that applies the tool concave-convex micro-structure at substrate surface.
The resinous coat of above-mentioned tool concave-convex micro-structure comprises particle and cement.For reaching high diffusion effect, the diameter of this particle should be between about 1 micron to about 20 microns, and preferable between about 1.5 microns to about 10 microns, when the diameter of particle was lower than 1 micron, diffusion effect was given birth in difficult labour, when being higher than 20 microns, easily produces coating defects.Particle is with respect to the amount of cement in the resinous coat, calculates with solid constituent, is preferably about 200 weight % to about 600 weight %, if particle is lower than 200 weight % with respect to the amount of cement, the light diffusing deficiency can take place; But if be higher than 600 weight %, particle is difficult to be fixed in the coating, and the phenomenon that can come off for taking into account coating high diffusibility and stability, is more preferred from about 280 weight % to about 400 weight %, and special good is that about 305 weight % are to about 350 weight %.
The resin-coated thickness of above-mentioned tool concave-convex micro-structure, atomizing effect to diffused component can exert an influence, therefore, resin-coated thickness depends on the mist degree demand of the diffused component of wishing to get, generally have between about 5 to about 20 microns thickness, preferable have about 10 to about 15 microns thickness, and better have about 8 to about 13 microns thickness.When coating is lower than 5 microns, then atomizing effect is not good, and when coating surpasses 20 microns, then the adherence of coating descends, and is unfavorable for coating.In addition, " the lamination amount " of resinous coat on base material can be by the per unit area general assembly (TW) of the base material of single face coating resin coating being deducted the base material weight before uncoated and got.According to the present invention, the about 6.5g/m2 of resin-coated lamination amount of above-mentioned tool concave-convex micro-structure is to about 26g/m2, and preferable about 10.5g/m2 is to about 19.5g/m2.
Can be used in the particle type among the present invention, there is no particular restriction, it can be organic granular, inorganic particle or both potpourris.The coating of particles of using does not also have particular restriction, for example sphere, rhombus etc.
Can be used for the organic granular among the present invention, be selected from the group that is formed by acryl resin, styrene resin, carbamate resins, silicone (silicone) resin and composition thereof.
Can be used for the inorganic particle among the present invention, be selected from the group that is formed by zinc paste, titania, zirconia, aluminium oxide, monox, bismuth oxide, zinc sulphide, barium sulphate and composition thereof.
The bonding agent that can be used among the present invention there is no particular restriction, it for example is selected from the group that acryl resin, polyamide, epoxy resin, fluorine resin, polyimide resin, urethane resin, alkyd resin (alkyd resin), vibrin and composition thereof are formed, be preferably acryl resin, urethane resin, vibrin or its potpourri, be more preferred from acryl resin.Be used in the bonding agent among the present invention, owing to must allow light see through, it is preferably water white transparency person.
For avoiding because of the diffused component yellow, cause display to produce aberration, optionally in above-mentioned resinous coat, add the inorganics that tool absorbs ultraviolet ability.Be applicable to inorganics kind of the present invention, there is no particular restriction, it is such as but not limited to zinc paste, massicot, aluminium oxide, silicon dioxide, titania, calcium sulphate, barium sulphate, lime carbonate or its potpourri.(nanometer nm), is preferably 1 to 100 nanometer to the particle diameter Yi Ban of above-mentioned inorganics Wei Approximately 1 to 500 nanometer, and special good is 20nm to 50nm.In addition, resinous coat used in the present invention also can optionally comprise any person's known additives that has the general knowledge in the technical field of the invention, and it is such as but not limited to initiating agent (initiator), solvent (solvent), antistatic agent (antistaticagent), hardening agent (curing agent), modification agent (modifying agent), leveling agent (levelling agent), stabilizing agent (stabilizing agent), fluorescer (fluorescentbrightener) or ultraviolet light absorber (ultraviolet absorber) etc.
According to a preferred embodiment of the present invention, optical film compound of the present invention, rise by incidence surface and to comprise a diffused component and a blast element in regular turn, diffused component of the present invention comprises a base material and this base material two sides respectively comprise a light diffusion layer, this light diffusion layer is one to have the resinous coat of concave-convex micro-structure, this resinous coat comprises particle and bonding agent, and particle is about 280～about 400 weight % with respect to the amount of bonding agent, above-mentioned diffused component has according to JIS K7136 standard method and records and be not less than 98% mist degree, is preferably and is not less than 99% mist degree; And wherein this blast element is a light harvesting film, this light harvesting film comprises a base material and and is positioned at optical structure layers on this base material, wherein this optical structure layers comprises a plurality of arc column structures, and the radius-of-curvature of this arc column structural top curved surface highest point is 5 microns to 12 microns, optionally, this optical structure layers comprises at least two uneven each other arc column structures.Above-mentioned particle is preferably the organic granular of 1 micron to 10 microns of diameter, and these organic granulars are preferably silicone resin.
For reaching ease of use, optical film compound of the present invention can optionally comprise an intermediate member, this intermediate member between this blast element and this diffused component and its thickness range be 0.5 μ m to 250 μ m, be preferably 1 μ m to 100 μ m, special good is 1 μ m to 50 μ m.Intermediate member of the present invention can or support collective optics and diffused component in order to binding, and two elements is fixed to one another, promotes its locating effect.In addition, this intermediate member can provide a buffer area to discharge the stress that optical film compound is produced because of distortion or when being subjected to external force, effectively solves warpage (waving) phenomenon that blast element and/or this diffused component produce because of factors such as the inequality of being heated, humidity or the gravity of material own.
According to a preferred embodiment of the present invention, intermediate member of the present invention is an adhesive coating, and this adhesive coating is made of a transparent optical adhesive layer.The preparation method of above-mentioned intermediate member there is no particular restriction, and it is such as but not limited to optical adhesive being applied on the side of blast element or diffused component bonding by this this blast element and this diffused component by coating or wire mark printing.
The used optical adhesive of the present invention has greater than 90% transmittance and has 1.4 to 1.6 refractive index.The used optical adhesive of the present invention is to be heat curing-type (thermal curing) resin or ultraviolet curing type (UV curing) resin or its potpourri, its kind there is no particular restriction, the group that for example optional free silicone resin, acryl resin, vibrin (polyester resin), polyether resin (polyether resin), polyurethane resin (PU), epoxy resin (Epoxy resin) and composition thereof are formed.
According to a preferred embodiment of the present invention, the optical adhesive that the present invention uses is the pressure-sensing glue stick, only need impose light pressure and just can reach good then effect at short notice, is fit to volume to volume formula (roll to roll) production technology continuously.The above-mentioned optical adhesive that can be used as the pressure-sensing glue stick there is no particular restriction, and its commercial goods is the AO-802 or the AO-805 of the production of Changxing chemical industrial company for example; By 8171,8141,8142 or 8212 of 3M company production; Or the CS9621 that produces by day east electrician (NittoDenko) company.
Fig. 2 to Figure 20 is the synoptic diagram of the embodiment of optical film compound of the present invention.
Fig. 2 is an embodiment of optical film compound of the present invention.As shown in Figure 2, optical film compound of the present invention comprises a light harvesting film 10 and a diffused component 20.This light harvesting film 10 comprises base material 11 and is positioned at optical structure layers 12 on the base material 11, and this optical structure layers comprises a plurality of prism column structures 121.This diffused component 20 comprises base material 21 and is positioned at concave-convex micro-structure layer 22 on base material 21 exiting surfaces.In this embodiment, this diffused component 20 is the incidence surfaces that are positioned at optical film compound of the present invention.
Fig. 3 is an embodiment of optical film compound of the present invention, and concave-convex micro-structure layer 22 is positioned at base material 21 incidence surfaces, and all the other structures and configuration and that shown in Figure 2 are together.
Fig. 4 is an embodiment of optical film compound of the present invention, and diffused component 20 comprises base material 21 and is positioned at the concave-convex micro-structure layer 22 of base material 21 incidence surfaces and exiting surface, and it is same in structure and configuration and that shown in Figure 2.
Fig. 5 is an embodiment of optical film compound of the present invention, and optical film compound shown in Figure 5 replaces outside the prism column structures 121 divided by arc column structure 122, and all the other structures and configuration are same with that shown in Figure 4.
Fig. 6 (a) is an embodiment of optical film compound of the present invention, and optical film compound shown in Fig. 6 (a) replaces outside the prism column structures 121 divided by lentoid 123, and all the other structures and configuration are same with that shown in Figure 4.Fig. 6 (b) is the three-dimensional view of the light harvesting film in the optical film compound of Fig. 6 (a).
Fig. 7 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 7 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with that shown in Figure 3 with.
Fig. 8 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 8 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with that shown in Figure 4 with.
Fig. 9 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 9 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with that shown in Figure 5 with.
Figure 10 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 10 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with that shown in Figure 6 with.In addition, the spatial structure of light harvesting film 10 can be with reference to figure 6 (b).
Figure 11 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 11 comprises a light harvesting film 10 and a diffused component 20.This light harvesting film 10 comprises base material 11 and is positioned at optical structure layers 12 on the base material 11, and this optical structure layers comprises a plurality of prism column structures 121.The structure of this diffused component 20 is same with that shown in Figure 4.In this embodiment, this light harvesting film 10 is the incidence surfaces that are positioned at optical film compound of the present invention, and with this optical structure layers towards light source.
Figure 12 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 12 replaces outside the prism column structures 121 divided by arc shape structure 122, and all the other structures and configuration are same with person shown in Figure 11.
Figure 13 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 13 replaces outside the prism column structures 121 divided by lentoid 123, and all the other structures and configuration are same with person shown in Figure 11.In addition, the spatial structure of light harvesting film 10 can be with reference to figure 6 (b).
Figure 14 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 14 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with person shown in Figure 11 with.
Figure 15 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 15 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with person shown in Figure 12 with.
Figure 16 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 16 is except that comprising an intermediate member 30 with as adhesive coating between light harvesting film 10 and diffused component 20, all the other structures and configuration be with person shown in Figure 13 with.
Figure 17 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 17 comprises a multiple field reflection polarisation reclamation film 50 and a diffused component 20.This diffused component 20 comprises base material 21 and is positioned at concave-convex micro-structure layer 22 on base material 21 exiting surfaces.In this embodiment, this diffused component 20 is the incidence surfaces that are positioned at optical film compound of the present invention.
Figure 18 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 180 comprises a multiple field reflection polarisation reclamation film 50 and a diffused component 20.This diffused component 20 comprises base material 21 and is positioned on base material 21 exiting surfaces and the incidence surface and all has concave-convex micro-structure layer 22.In this embodiment, this diffused component 20 is the incidence surfaces that are positioned at optical film compound of the present invention.
Figure 19 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 19 is except that comprising an intermediate member 30 with as adhesive coating between multiple field reflection polarisation reclamation film 50 and diffused component 20, all the other structures and configuration be with person shown in Figure 17 with.
Figure 20 is an embodiment of optical film compound of the present invention.Optical film compound shown in Figure 20 replaces light harvesting films 10 divided by reflection polarisation reclamation film 50, and all the other structures and configuration are same with that shown in Figure 7.
Because LED is a pointolite, light directive property height, and the bright-dark degree of horizontal direction and vertical direction is inequality, so except the even value of briliancy that will adjust horizontal direction and vertical direction, also need to adjust integral brightness and evenly be worth, could eliminate the MURA phenomenon of LED-backlit module fully.Optical film compound of the present invention, comprise a blast element and a diffused component, seeing through utilizes diffused component to be not less than the high diffusibility of 98% mist degree, light is atomized, recycling the blast element again atomizes portions of light line reflection to diffused component again, can reach overall light homogenize effect, and the blast element has the luminance gain effect, so optical film compound of the present invention can homogenize light and kept good briliancy again.Given this, optical film compound of the present invention can effectively solve the brightness disproportionation problem and not need additionally to increase light mixing distance, therefore be applicable to direct type backlight module, direct-light type LED backlight module particularly, the trend of field of display development can be met, and the cost of direct type backlight module integral body can be saved.
Embodiment
Below enumerate embodiment to optical element of the present invention with and preparation method thereof further instruction is provided.These embodiment only are used for illustration the present invention, limit the scope of the invention in any case be not used in.Under the situation that does not depart from purport of the present invention, can carry out various variations, distortion or change to the present invention, these variations, distortion or change are also contained in the scope of the invention.
＜anti-Mura test 〉
The direct-light type LED backlight module comprises several and is positioned at led light source under the backlight module.The light source that the direct-light type LED backlight module is provided is a pointolite, if the even light effect deficiency of the optical element that collocation is used will produce the phenomenon of visible brightness irregularities visually, this situation is called " Mura ", has a strong impact on the development quality.
In the conventional art field Mura be there is no the expression mode of quantification, only depend on naked eyes to judge and differentiate, can't specifically assess the Mura phenomenon.The invention provides a kind of method that LED-backlit module light uniformity coefficient is quantized, assess the elimination degree of Mura by the size of the even value of briliancy.
Method of the present invention is as follows:
One, vertical briliancy homogeneity of assessment backlight module:
1. get the center longitudinal axis of backlight module, the brightness value of a plurality of test points (L) on the measurement axis.
2. the brightness value (L) of each point on this center longitudinal axis is mapped to the position of this point, brightness value is wavy distribution with the position of each point.
3. after getting rid of the bigger data of this center longitudinal axis two-end-point otherness, take out the maximum (L in this center longitudinal axis gained brightness value
Vmax), and in same ripple, take out brightness value reckling (L
Vmin).
4. the briliancy of calculating this center longitudinal axis by following formula evenly is worth R
V:
R
V＝L
Vmin/L
Vmax。
R
VNear 1, represent that vertical briliancy homogeneity of this backlight module is higher more, therefore, vertically the Mura phenomenon on is not obvious more.Generally speaking, R
VBe higher than at 0.983 o'clock, represent that vertical briliancy convergence of this backlight module is even, be difficult for visual Mura phenomenon on going out vertically.
Two, the horizontal briliancy homogeneity of assessment backlight module:
1. get the central cross axle of backlight module, the brightness value of a plurality of test points (Λ) on the measurement axis.
2. the brightness value (Λ) of each point on this central cross axle is mapped to the position of this point, brightness value is wavy distribution with the position of each point.
3. after getting rid of the bigger data of this central cross axle two-end-point otherness, take out the maximum (Λ in this central cross axle gained brightness value
H μ α ξ), and in same ripple, take out brightness value reckling (A
H μ ι ν).
4. the briliancy of calculating this central cross axle by following formula evenly is worth P
H:
P
H＝A
Hμιν/Λ
Hμαξ。
P
HNear 1, represent that the horizontal briliancy homogeneity of this backlight module is higher more, therefore, M υ ρ α phenomenon transversely is not obvious more.Generally speaking, P
HBe higher than at 0.983 o'clock, represent that the horizontal briliancy convergence of this backlight module is even, be difficult for the visual M υ ρ α phenomenon that goes out transversely.
Three, work as R
VAnd R
HAll be higher than at 0.983 o'clock, though according to above-mentioned steps one and two assessment, its vertically and Mura phenomenon transversely not obvious, if R
VWith R
HDifference is excessive, and visual effect is not good, still can examine the Mura phenomenon takes place on the optical module of passing away.Therefore, work as R
VAnd R
HAll be higher than at 0.983 o'clock, can re-use the briliancy uniformity coefficient of following formula assessment backlight module integral body:
M.I.(mura?index)＝|(R
H/R
V)-1|。
M.I. more near 0, the brightness value difference of expression lateral shaft and lateral shaft is little.Generally speaking, when M.I. is higher than 0.002, can visual inspection go out to have the Mura phenomenon.
Diaphragm is prepared
Commercially available optical element: model: HGP210; Good prestige optics (Gamma Optical) company (the light harvesting film of tool prism column structure)
Blast element 2
Commercially available optical element: model: LSF-451B; LG chemistry (LG Chemical) company (the light harvesting film of tool arc column structure)
Blast element 3
Commercially available optical element: model: PTR-763, new and (SHINWHA) company's (light harvesting film of tool lentoid).
Blast element 4
Commercially available optical element: model: DBEF-D2-280; 3M company (multiple field reflection polarisation reclamation film)
With 24.0 gram acryl resin [models: Eterac 7363-ts-50, Changxing chemical industrial company] (the about 50 weight % of solid), add in the plastic bottle, under high-speed stirred, add butyl acetate 33 grams more in regular turn, methyl proxitol acetate 24 grams, mean grain size is the silicone resin pearl powder 40 gram [models: Tospearl 120E of 2 μ m, GE Toshiba silicone (GE Toshiba silicones) company], Nano titanium dioxide (80%), zinc paste (20%) solution is totally 56 grams (the about 50 weight % of solid), add hardening agent [model: Desmodur 3390 at last, Bayer (Bayer) company] 2.4 grams (the about 75 weight % of solid), make the about 44 weight % of solid, the coating of about 179.4 grams of gross weight.Above-mentioned coating being coated on PET[model: O330E250 respectively, company of Mitsubishi (Mitsubishi)] on the base material both side surface, each can get 10 μ m after 1 minute films that (the lamination amount is 13g/m through 120 ℃ of dryings for each
2), record 99.15% mist degree through JIS K7136 standard method.
Diffused component 2
Method for making such as diffused component 1, but coating only is coated on base material one side surface.Record 98% mist degree through JIS K7136 standard method.
Diffused component 3
Commercially available optical element: model: Etertec DI500C; Changxing chemistry.Record 94% mist degree through JIS K7136 standard method.
Diffused component 4
Commercially available optical element: model: Etertec DI700C; Changxing chemistry.Record 96% mist degree through JIS K7136 standard method.
Optical adhesive is prepared
Commercially available optical adhesive: model: AO-802; Changxing chemistry, the AUTOMATIC REFRACTOMETER GPR11-that provides by Index Instruments company
It is 1.5 that instrument measures its refractive index
Backlight module is prepared
Prepare the lamp box that one 20cm * 20cm direct-light type LED backlight module is used, this lamp house thickness is 24mm, this lamp box orlop is a supportive steel plate, attach reflector plate on the steel plate, 64 LED lamp sources on average dispose and are fixed in the reflector plate top, and a diffuser plate with supportive is placed on upper strata, LED lamp source.
Combination of optical films thing with following embodiment/comparative example places the diffuser plate top again, calculates R with said method
VAnd R
HVertical and the horizontal briliancy homogeneity of assessment backlight module is selected R again
VAnd R
HAll be higher than 0.983 sample, calculate the M.I. value to assess its integral brightness uniformity coefficient.
Embodiment 1 (E1)
Embodiment 2 (E2)
Blast element 2 is positioned over the top of diffused component 1, and the optical structure layers that makes blast element 2 is towards the direction back to the lamp source.
Embodiment 3 (E3)
Blast element 3 is positioned over the top of diffused component 1, and the optical structure layers that makes blast element 3 is towards the direction back to the lamp source.
Embodiment 4 (E4)
Blast element 4 is positioned over the top of diffused component 1.
Comparative example 1 (C1)
Blank assay: do not place diaphragm
Comparative example 2 (C2)
Only place diffused component 1
Comparative example 3 (C3)
Comparative example 4 (C4)
Table 1
| Comparative example/embodiment | ??R V | ??R H | ??M.I |
| ??E1 | ??0.9939 | ??0.9931 | ??0.0008 |
| ??E2 | ??0.9911 | ??0.9902 | ??0.0009 |
| ??E3 | ??0.9870 | ??0.9866 | ??0.0004 |
| ??E4 | ??0.9874 | ??0.986 | ??0.0014 |
| ??C1 | ??0.9729 | ??0.9793 | ??- |
| ??C2 | ??0.9844 | ??0.9899 | ??0.0056 |
| ??C3 | ??0.9767 | ??0.9805 | ??- |
| ??C4 | ??0.9840 | ??0.9811 | ??- |
By the result of embodiment 1 to 4 as can be known, optical film compound of the present invention comprises and has diffused component and the blast element that is not less than 98% mist degree, and the briliancy of longitudinal axis evenly is worth R
VEvenly be worth R with the briliancy of lateral shaft
HAll be higher than 0.983, and M.I. is lower than at 0.002 o'clock,, do not have the mura phenomenon so the briliancy of backlight module integral body is evenly good.
Comparative example 1 is not placed any diaphragm, and comparative example 3 and 4 uses mist degrees less than 98% diffusion component.Comparative example 1,3 and 4 gained R
HAnd/or R
VValue is lower than 0.983, can't effectively eliminate the mura phenomenon.
Comparative example 2 gained R
HAnd R
VValue is higher than 0.983, but because M.I. is higher than 0.002, R
HAnd R
VDifference is big, still can produce the mura phenomenon.
＜Kang Gua ﹠amp; Wear-resisting test 〉
Generally speaking, the radius-of-curvature (R) of arc column top curve surface highest point is big more, and resistance to scraping is good more.
Method of testing:
The measurement of the radius-of-curvature at top (R): the MM400-Lu metaloscope RLM615 instrument that provides with Nikon (NIKON) company measures the radius-of-curvature of arc column structural top, and the gained outcome record is in table 2.
Anti-scratch test: (area length and width 20mm * 20mm) goes up and pastes sticking optical film compound to be measured (length and width 20mm * 20mm) in 350 g weight platforms to utilize linear abrasion wear test machine [U.S. TABER model: 5750], make its optical structure layers up, use another surface one side of optical structure layers (do not have) of another diaphragm of the same race, with test trip 0.5inch (inch), the speed of 10cycle/min (cycles per minute) is carried out 10 anti-scratch tests of round-robin, whether another surface of observing this optical structure layers and another diaphragm of the same race has by scratch, if both all do not have scratch, then can be by test.Shown in the following tabulation 2 of test gained result.
Abrasion test:
Get a diaphragm to be measured (length and width 100mm * 100mm),, less than 100mg, then can pass through test as if loss in weight with the abrasivity that ASTM D4060 (CS-10 wheel, 1,000g, 1,000 revolution) tests this optical structure layers.
Embodiment 2-1～2-5
Embodiment 2-1 (E2-1)
Preparation blast element 5: with commercially available glue (model
Changxing chemical company) coats PET base material (model
TORAY company) goes up the formation coating, utilize roller embossing mode on this coating, to form a plurality of arc column structures then, again with UV energy (350mJ/cm
2) this coating of radiation exposure, make it to solidify, make a microstructured layers.Obtained microstructured layers has 30 microns thickness, and the radius-of-curvature (R) of these arc column structural top is 10 microns, and prismatic width is 60 microns.
Blast assembly 5 is disposed at the top of diffusion component 1, and the optical structure layers that makes blast assembly 5 is towards the direction back to the lamp source.
Embodiment 2-2 to 2-5 (E2-2～E2-5)
Repeat embodiment 2-1 method, the radius-of-curvature (R) that changes arc column structural top is respectively 5,3,2 and 0 microns.
Table 2
| Embodiment | ??R | ??R V | ??R H | ??M.I | Anti-scratch test | Abrasion test |
| ??E2-1 | ??10μm | ??0.9911 | ??0.9902 | ??0.0009 | ??○ | ??○ |
| ??E2-2 | ??5μm | ??0.9916 | ??0.9922 | ??0.0006 | ??○ | ??○ |
| ??E2-3 | ??3μm | ??0.9925 | ??0.9918 | ??0.0007 | ??× | ??× |
| ??E2-4 | ??2μm | ??0.9930 | ??0.9923 | ??0.0006 | ??× | ??× |
| ??E2-5 | ??0μm | ??0.9939 | ??0.9931 | ??0.0008 | ??× | ??× |
Zero: by test
*: not by test
By the result of embodiment 2-1 to 2-5 as can be known, optical film compound uses the blast element of at least 5 microns of the radius-of-curvature of arc column top curve surface highest point, can eliminate mura, and take into account anti-scratch characteristic.
＜camber test 〉
Diaphragm to be measured is cut into the smooth optical film compound of length and width 100mm * 100mm, places 120 ℃ of baking ovens after 10 minutes, take out and be statically placed in room temperature, rise again to room temperature up to diaphragm, with clearance gauge measure four jiaos on diaphragm warpage degree (the record unit: millimeter (mm), recording mode: for example, 0; 0; 0; 0), uses the heat-resisting and anti-warpage performance of assessment testing sample, shown in the following tabulation 3 of camber test gained result.
Embodiment 5 to 8 (E5 to E8)
Use optical adhesive 1 respectively the blast element and the diffused component of the optical film compound of embodiment 1 to 4 to be bonded together as intermediate member (thickness 25 μ m).Except that adding intermediate member, the configuration mode of gained optics optical film compound in backlight module is identical with embodiment 1 to 4.
Table 3
| Embodiment | ??R V | ??R H | ??M.I | Camber test (mm) (120 ℃, 10min) |
| ??E5 | ??0.9869 | ??0.9875 | ??0.0006 | ??0；0；??0；0 |
| ??E6 | ??0.9867 | ??0.9861 | ??0.0006 | ??0；0；??0；0 |
| ??E7 | ??0.9866 | ??0.9859 | ??0.0007 | ??0；0；??0；0 |
| ??E8 | ??0.9866 | ??0.9846 | ??0.002 | ??0；0；??0；0 |
By the result of embodiment 5 to embodiment 8 as can be known, optical film compound of the present invention, if comprise an intermediate member between blast element and this diffused component, this intermediate member can provide a buffer area to discharge the stress of optical film compound, so can avoid the warping phenomenon of optical film compound.In addition, though the optical film compound of embodiment 5 to 8 comprises an intermediate member, gained R in addition
HAnd R
VValue all be higher than 0.983 and M.I. be lower than 0.002, also can effectively eliminate the mura phenomenon.
Embodiment 5-1 (E5-1)
Use optical adhesive 1 as intermediate member (thickness 1 μ m), all the other are as embodiment 5, and the gained outcome record is in table 4.
Table 4
| Embodiment | ??R V | ??R H | ??M.I | Camber test (mm) |
| ??E5 | ??0.9869 | ??0.9875 | ??0.0006 | ??0；0；0；0 |
| ??E5-1 | ??0.9867 | ??0.9861 | ??0.0006 | ??0；0；0；0 |
By the result of embodiment 5 and embodiment 5-1 as can be known, utilize optical adhesive that blast element and diffused component are combined, even the thickness of optical adhesive only has 1 micron, warping phenomenon still can not take place in optical film compound, can reach the effect of eliminating mura again.
Embodiment 9 (E9)
Blast element 2 is positioned over the top of diffused component 2, and the concave-convex micro-structure layer of diffused component 2 is towards blast element 2, and the optical structure layers of blast element 2 is towards the direction back to the lamp source.
Embodiment 10 (E10)
Use optical adhesive 1 blast assembly 2 not to be had a side and diffusion component 2 uncoated resin-coated sides of optical structure layers and bond together, and the optical structure layers that makes blast assembly 2 is towards the direction back to the lamp source as intermediate member (thickness 25 μ m).
The briliancy of the longitudinal axis of computing module integral body evenly is worth R
V, lateral shaft briliancy evenly be worth R
H, briliancy evenly is worth M.I., gained result such as table 5.
Table 5
| Embodiment | ??R V | ??R H | ??M.I |
| ??E9 | ??0.9866 | ??0.9859 | ??0.0007 |
| ??E10 | ??0.9866 | ??0.9854 | ??0.0012 |
By the result of embodiment 9 to embodiment 10 as can be known, optical film compound of the present invention comprises a diffusion component, no matter diffusion component comprises a light diffusion layer or two light diffusion layers, is not less than 98% mist degree as long as diffusion component has, and can reach the effect of eliminating mura.
Embodiment 1-1 to 1-2
Embodiment 1-1 (E1-1)
Silicone resin pearl powder with diffused component 1 changes 5 microns of mean grain sizes into, 33.7 grams, and infusion becomes solid about 42.5%, the about 173 gram coating of gross weight.Coating is coated on respectively on the PET base material both side surface, and 13 microns (the lamination amount is 11.2g/m to thickness
2), recording 98.7% mist degree through JIS K7136 standard method, all the other are as the foregoing description 1.
Embodiment 1-2 (E1-2)
Silicone resin pearl powder with diffused component 1 changes 3 microns of mean grain sizes into, 45.8 grams, and infusion becomes solid about 46%, the about 185 gram coating of gross weight.Coating is coated on respectively on the PET base material both side surface, and 8 microns (the lamination amount is 12g/m to thickness
2), recording 99.35% mist degree through JIS K7136 standard method, all the other are as the foregoing description 1.
The briliancy of the longitudinal axis of computing module integral body evenly is worth R
V, lateral shaft briliancy evenly be worth R
H, briliancy evenly is worth M.I., the gained result is as shown in table 6.
Table 6
| Embodiment | ??Haze | ??R V | ??R H | ??M.I |
| ??E1 | ??99.15 | ??0.9939 | ??0.9931 | ??0.0008 |
| ??E1-1 | ??98.7 | ??0.9936 | ??0.9927 | ??0.0009 |
| ??E1-2 | ??99.35 | ??0.9941 | ??0.9935 | ??0.0006 |
By the result of embodiment 1-1 to embodiment 1-2 as can be known, diffusion component of the present invention can go to adjust according to the different product demand, when diffusion component has when being not less than 98% mist degree, all can reach the effect of eliminating mura, and mist degree is high more, and effect is good more.
Claims (23)
1. optical film compound, it comprises
One blast element; And
One diffused component, wherein this diffused component comprises a base material, and at least one side of this base material comprises a light diffusion layer, and this diffused component has according to JIS K7136 standard method and records and be not less than 98% mist degree.
2. optical film compound as claimed in claim 1, the both sides of the base material of wherein said diffused component all comprise light diffusion layer.
3. optical film compound as claimed in claim 1, wherein said diffused component detects with goniophotometer, and when-90 ° to 90 ° incident angle projections, the strongest angle of light intensity that goes out that records is in ± 10.
4. optical film compound as claimed in claim 1, wherein said light diffusion layer are one to have the resinous coat of concave-convex micro-structure, and this resinous coat comprises particle and bonding agent, and particle is 200～600 weight % with respect to the amount of this bonding agent.
5. optical film compound as claimed in claim 4, wherein said particle is 280～400 weight % with respect to the amount of this bonding agent.
6. optical film compound as claimed in claim 4, wherein said resinous coat have the thickness of 5 μ m to 20 μ m.
7. optical film compound as claimed in claim 4, wherein said resinous coat have the thickness of 8 μ m to 13 μ m.
8. optical film compound as claimed in claim 4, wherein said bonding agent is selected from the group that is made up of acryl resin, polyamide, epoxy resin, fluorine resin, polyimide resin, urethane resin, alkyd resin, vibrin and composition thereof.
9. optical film compound as claimed in claim 4, wherein said particle is the organic granular that is selected from the group that is made up of acryl resin, styrene resin, carbamate resins, silicone resin and composition thereof, or be selected from the inorganic particle of the group that is formed by zinc paste, titania, zirconia, aluminium oxide, monox, bismuth oxide, zinc sulphide, barium sulphate and composition thereof or the potpourri of described organic granular and described inorganic particle.
10. optical film compound as claimed in claim 4, wherein said particle have the diameter of 1 μ m to 10 μ m.
11. optical film compound as claimed in claim 1 further comprises the intermediate member that is positioned between this blast element and this diffused component, wherein this intermediate member has the thickness of 0.5 μ m to 250 μ m.
12. optical film compound as claimed in claim 11, wherein said intermediate member are adhesive coating, in order to bonding this blast element and this diffused component.
13. optical film compound as claimed in claim 12, wherein said adhesive coating are an optical adhesive layer, and this optical adhesive has greater than 90% transmittance and has 1.4 to 1.6 refractive index.
14. optical film compound as claimed in claim 13, wherein said optical adhesive is selected from the group that is made up of silicone resin, acryl resin, vibrin, polyether resin, polyurethane resin, epoxy resin and composition thereof.
15. optical film compound as claimed in claim 13, wherein said optical adhesive are to be pressure-sensing glue stick (PSA).
16. optical film compound as claimed in claim 1, wherein said blast element are a light harvesting film, multiple field reflection polarisation reclamation film, optical activity nematic crystal brightness enhancement film or wire grating polaroid.
17. comprising a base material and, optical film compound as claimed in claim 16, wherein said light harvesting film be positioned at optical structure layers on this base material.
18. optical film compound as claimed in claim 17, wherein said optical structure layers comprises a plurality of microstructures, and this microstructure is selected from the group that is made up of column structure, cone-shaped structure, cube corner structures, orange petal shape block structure, lentoid and capsule shape structure and combination thereof.
19. optical film compound as claimed in claim 18, wherein said microstructure comprises column structure, and at least two column structures are not parallel each other.
20. optical film compound as claimed in claim 19, wherein said column structure comprise prism column structure, arc column structure or its combination.
21. optical film compound as claimed in claim 20, the radius-of-curvature of wherein said arc column structural top curved surface highest point is 2 microns to 50 microns.
22. an optical film compound, it is risen by incidence surface and comprises a diffused component and a blast element in regular turn,
Wherein this diffused component comprises a base material and this base material both sides comprise a light diffusion layer, this light diffusion layer is one to have the resinous coat of concave-convex micro-structure, this resinous coat comprises particle and bonding agent, and particle is 280～400 weight % with respect to the amount of this bonding agent, and this diffused component has according to JIS K7136 standard method and records and be not less than 98% mist degree; This blast element is a light harvesting film, and this light harvesting film comprises a base material and and is positioned at optical structure layers on this base material, and wherein this optical structure layers comprises a plurality of arc column structures.
23. optical film compound as claimed in claim 22, wherein the radius-of-curvature of these arc column structural top curved surface highest points is 5 microns to 12 microns.
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|---|---|---|---|
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Application publication date: 20100630 |