CN101661123A - Optical element - Google Patents
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- CN101661123A CN101661123A CN200910177640A CN200910177640A CN101661123A CN 101661123 A CN101661123 A CN 101661123A CN 200910177640 A CN200910177640 A CN 200910177640A CN 200910177640 A CN200910177640 A CN 200910177640A CN 101661123 A CN101661123 A CN 101661123A
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Abstract
The invention provides an optical element comprises base material(a), a first surface (b) and a second surface (c); wherein the first surface (b) positioned is at one side of the base material, the first surface comprises a plurality of prism structures provided with circular arc tops, and the curvature radiuses of the circular arc tops are 3-20 microns; and the second surface (c) is positioned atthe other side of the base material, and the second surface can be a plane or has concave-convex structure.
Description
Technical field
The present invention relates to a kind of optical element, be specifically related to a kind of optical element that is applied to direct type backlight module.
Background technology
Conventional backlight module can be divided into " side-light type (Edge Lighting) ", " straight-down negative (Direct Lighting) " and " embedded (Embedded Lighting) " backlight module according to the position of light source.Side light type back light module is the side that light source is placed module, and characteristic such as it has gently, approaches, low power consumption is particularly suitable for being applied in mobile phone, PDA(Personal Digital Assistant), the mobile computer.Yet, because the restriction of light guide plate makes that the quantity of light source that is positioned over side is limited, therefore, side light type back light module generally only is used for 18 o'clock following small-medium size products, and can't provide enough light sources in the LCD (LCD) of large-size.Straight-down negative and embedded backlight module are that a plurality of light sources are placed on the bottom surface of module, and light is upwards penetrated by the front.Though its thickness is bigger, weight is also heavier, because enough light sources can be set, high briliancy, visual angle are good, the utilization ratio advantages of higher of light and have, thus generally be to be used in the large scale product, for example LCD monitor and LCD TV etc.
The light source of general direct type backlight module for cold cathode fluorescent lamp (Cold CathodeFluorescent Lamp, CCFL) or light emitting diode (Light Emitting Diode, LED).Cold cathode fluorescent lamp has characteristics such as high briliancy, high-level efficiency and life-span be long, adds that its cylindrical shape very easily is combined into laminal luminaire with light reflection element, thus become direct type backlight module mainly go out optical element.Only, the cold cathode fluorescent lamp in the direct type backlight module 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 display screen, reduces the quality of video picture.Moreover for considering the direct-light-type backlight module of high brightness demand, size is bigger, required fluorescent tube number the more, the light and shade fringe phenomena that is then occurred is promptly more serious, therefore, becomes a great development bottleneck in LCD display field.
Settling mode to this problem mainly contains two kinds at present: one for elongating the distance between light source and light guide plate or the diffusion sheet, to reduce this kind light and shade zoning.Yet in case after light source and other element distances zoomed out, except that briliancy promptly decayed, the integral thickness of backlight module also increased thereupon thereupon, these two kinds of problems of deriving are all violated the requirement to backlight module is light, thin, light utilization efficiency is high.Another kind of mode then is that diffused component and prism element are set between light source and liquid crystal panel, its diffusion and light harvesting function of mat respectively, will be by after the light diffusion homogenize that fluorescent tube sent, dwindling its dispersion angle again makes it concentrate on positive visual angle (On-axis) direction of degree approximately ± 35, effectively being coupled in the liquid crystal panel, and reach the effect of light uniformization.Only, the normal briliancy that produces of this design is too low or can't eliminate the problem of light and shade striped fully.
As shown in Figure 1, United States Patent (USP) the 6th, 280 discloses a kind of combined type optical gain element No. 063, and it comprises base material 12, be positioned at the diffusion layer 14 of base material bottom and be positioned on the base material microstructured layers 16 with respect to diffusion layer.This optical gain element spreads and the light harvesting step by diffusion layer 14 and microstructured layers 16, the effect of the even light of performance.Because it is circular-arc that the prism structure top of its microstructured layers 16 is, and can increase wearing quality, but because of the radius-of-curvature at circular arc top excessive (about prism width 20 to 45%), spotlight effect is relatively poor.In addition, the optical scatter 18 in the diffusion layer 14, when the diffusion layer assembling was used, easily the adjacent element of scratch influenced optical property.
As shown in Figure 2, U.S. Patent Application Publication discloses a kind of blooming piece No. 2008/0225207, the concentration structure that it comprises a plurality of semi-cylindricals and is doped with diffusion particle is used damage and the even light effect of lifting of avoiding concentration structure and adjacent elements friction to be given birth to.Only, the semi-cylindrical in configuration spotlight effect is not good, and because of containing the utilization that diffusion particle can reduce light, the gained briliancy is too low.
Given this, how to develop a kind of optical element that can be used in the direct type backlight module and can provide effects such as light uniformization, high light source utilization factor and low cost, become the problem of the relevant required urgent solution in research and development field.
Summary of the invention
Fundamental purpose of the present invention is that a kind of optical element that can be used in the direct type backlight module and can provide effects such as light uniformization, high light source utilization factor and low cost is provided.
To achieve these goals, the inventor has carried out research extensively and profoundly, found that following optical element can realize purpose of the present invention.
That is, the present application provides following every invention:
1. optical element, it comprises
(a) base material;
(b) be positioned at the first surface of base material one side, this first surface comprises the prism structure at a plurality of tool circular arcs top, and the radius-of-curvature at these circular arc tops is 3 microns to 20 microns; And
(c) be positioned at the second surface of base material opposite side, this second surface can be a plane or has concaveconvex structure.
2. as the 1st optical element, wherein plural at least prism structure is not parallel to each other each other.
3. as the 2nd optical element, wherein these prism structures that are not parallel to each other are to be the form that has intersected or intersected.
4. as the 1st optical element, wherein this second surface has concaveconvex structure.
5. as the 4th optical element, wherein this second surface has the concaveconvex structure that does not contain diffusion particle.
6. as the 4th optical element, wherein this second surface has the concaveconvex structure that includes diffusion particle.
7. optical element, it comprises:
(a) base material;
(b) be positioned at the first surface of this base material one side, this first surface comprises the prism structure at a plurality of tool circular arcs top, and the radius-of-curvature at these circular arc tops is 3 microns to 20 microns; And
(c) be positioned at the second surface of base material opposite side, this second surface has concaveconvex structure,
Wherein these prism structures have the glass transition temperature less than 40 ℃.
8. as the 7th optical element, wherein this optical element does not exist under the situation of any structure at the first surface of base material, measures according to JIS K7136 standard method, and mist degree is not less than 3%.
9. as the 7th optical element, wherein these prism structures can be by the pencil hardness test of HB with the test of JIS K-5400 method.
10. optical element, it comprises:
(a) base material;
(b) be positioned at the first surface of this base material one side, this first surface comprises the prism structure at a plurality of tool circular arcs top, and the radius-of-curvature at these circular arc tops is 3 microns to 20 microns; And
(c) be positioned at the second surface of base material opposite side, this second surface can be a plane or has concaveconvex structure,
Wherein these prism structures are with the test of ASTM D4060 method (CS-10 wheel, 1,000g, 1,000 revolution), and loss is lower than 100mg.
11. as the 10th optical element, wherein these prism structures can be by the pencil hardness test of HB with the test of JIS K-5400 method.
12. a direct type backlight module, it comprises as each optical element in the 1st to 11.
Optical element of the present invention has the effect of even light and optically focused, and can keep away self by scratch or adjacent other element of scratch.
Description of drawings
Fig. 1 is the synoptic diagram of conventional combined type optical gain element.
Fig. 2 is the synoptic diagram of another conventional combined type optical gain element.
Fig. 3 is the synoptic diagram of optical element of the present invention.
Fig. 4 to 7 is the synoptic diagram of the embodiment of optical element of the present invention.
Fig. 8 is the assembling synoptic diagram of the optical element of the backlight module and the embodiment of the invention.
Fig. 9 is the brightness value standardization figure of vertical central axis of the middle section of the backlight module of not placing optical element.
Figure 10 is the brightness value standardization figure of the vertical central axis of the middle section of the backlight module of the optical element of placement embodiment 1.
The main element symbol description
12 base materials
14 diffusion layers
16 microstructured layers
18 optical scatters
30 optical elements
31 base materials
301 first surfaces
302 second surfaces
32 prism structures
33 microstructured layers
34 concaveconvex structures
The d width
The R radius-of-curvature
α paddy portion angle
40,50,60,70 base materials
41,51,61,71 first surfaces
42,52,62,72 second surfaces
The prism structure at 411,511,611,711 tool circular arc tops
421 do not contain the concaveconvex structure of diffusion particle
511 ', 611 ', the 711 ' prism structure that is not parallel to each other each other
621 do not contain the concaveconvex structure of diffusion particle
721 concaveconvex structures
722 diffusion particles
80 lamp boxes
81 reflector plates
82 fluorescent tubes
83 diffuser plates
84 optical elements
85 steel plates
Embodiment
Employed in this article term is not in order to restriction protection domain of the present invention only for describing 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, " prism " is made of two inclined surfaces, and this inclined surface is plane or curved surface, and this two inclined surface forms the peak in the prism roof intersection, and can be separately intersects in the bottom with another inclined surface of adjacent column structure and form paddy.
In this article, " prism structure width " is the ultimate range that is defined as between prism structure two valley lines.
In this article, " linear prismatic structures " is the column structure that the crest line (ridge) that is defined as prism structure extends straight.
In this article, " curve prism structure " is that the crest line that is defined as prism structure is the prism structure that bending change is extended, it is to form suitable surface curvature change that crest line is extended in this bending, the surface curvature change that crest line is extended in this bending is to be 0.2% to 100% of benchmark with this curve prism structure height, is 1% to 20% of benchmark with this curve prism structure height preferably.
In this article, " pencil hardness " is meant the pencil with Mitsubishi, measures testing sample surface, measured hardness according to JIS K-5400 standard method.
The material of the base material that the present invention is used can be any general technical staff of the technical field of the invention 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 for example is selected from following group: vibrin (polyester resin), as polyethylene terephthalate (polyethylene terephthalate, PET) or PEN (polyethylene naphthalate, 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, but not as limit.Wherein, preferably be selected from vibrin, polycarbonate resin and combination thereof; Be more preferably polyethylene terephthalate.The shape of base material is generally membranaceous or sheet.The thickness of base material depend on usually the demand of the optical articles desiring to make, be generally 15 microns to 300 microns.
The first surface of base material of the present invention has a microstructured layers, and this microstructured layers comprises the prism structure at a plurality of tool circular arcs top.By the prism structure (generation light harvesting) that contains circular arc top (producing diffusion), reach the effect that has even light and light harvesting concurrently.With regard to the identical prism structure of drift angle angle, prismatic width is bigger, and its spotlight effect is better.But when prismatic width is excessive, can produce visible light and shade striped on the contrary, influence image display quality, general industry prismatic width commonly used is about 30 microns to about 100 microns.On the other hand, the radius-of-curvature at circular arc top is less than 2 microns, though spotlight effect is good, yet this moment, the top produced damage because of colliding or contacting easily; If circular arc top radius-of-curvature is bigger, resistance to scraping is preferable, and has the light diffusion property, and even light effect can be provided, but if radius-of-curvature is excessive, then spotlight effect is relatively poor, and the luminance gain value descends.The present application people goes through repeatedly experiment, finds that the radius-of-curvature when the circular arc top is 3 microns to 20 microns, is preferably 5 microns to 15 microns, more preferably 7 microns to 12 microns the time, can provide good optically focused and even light effect simultaneously, meets the demand of present industry.In addition, the radius-of-curvature at circular arc top is preferably the 5-20% of this prism structure width, more preferably 10-20%.
Above-mentioned prism structure can be linearity (linear) prism structure, curve (serpentine) prism structure or broken line (zigzag) prism structure, is preferably linear prismatic structures.The peak heights of column structure of the present invention 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), preferably its amplitude of variation be this nominal height 50 5 percent to percent between.
Fig. 3 is the synoptic diagram of an embodiment of optical element of the present invention.As shown in Figure 3, optical element 30 comprises base material 31, this base material comprises first surface 301 and second surface 302, wherein first surface 301 comprises the microstructured layers 33 that the prism structure 32 by a plurality of tool circular arcs top is constituted, above-mentioned these prism structures are contour and wide, and parallel to each other in twos, second surface 302 tool concaveconvex structures 34.Prism structure 32 has width d, and is made of two inclined surfaces, and it is the circular arc top of R that this two inclined surface forms radius-of-curvature in the prism top curved.In addition, this two inclined surface intersects in the bottom with another inclined surface of adjacent prism structure separately and forms paddy, and paddy portion angle is α.
According to the present invention, the paddy portion angle (α) of these prism structures can be identical or inequality, is preferably about 70 ° to about 110 °, more preferably about 85 ° to about 95 °; The radius-of-curvature at each circular arc top can be identical or inequality, and it can be about 3 microns to about 20 microns, is preferably about 5 microns to about 15 microns, more preferably 7 microns to 12 microns; Each prism structure width can be identical or inequality, is preferably about 30 microns to about 100 microns, more preferably about 40 microns to about 70 microns.
For reducing the optical interference phenomenon, microstructured layers of the present invention can comprise plural at least uneven each other prism structure.According to the present invention, this microstructured layers comprises at least one group of uneven two prism structures that intersected and/or at least one group of uneven two prism structures that do not intersect.
Microstructured layers of the present invention, can use the known any way preparation of general technical staff of 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 the microstructured layers that will prepare is pressed on the base material; Or with volume to volume formula (roll to roll) continuously production technology be coated with first coating in the base material upside, and it is solidified the microstructure of being desired to form.The thickness of microstructured layers of the present invention there is no particular restriction, normally between about 1 micron to about 50 microns thickness, be preferably 5 microns to 35 microns, the best is 15 microns to 25 microns.
Microstructured layers of the present invention preferably has＜40 ℃ glass transition temperature (Tg), better have＜35 ℃ glass transition temperature, this moment, this microstructured layers had rebound resilience, that is, after removing, pressurized can return to original shape, with the test of JIS K-5400 method, can be by the pencil hardness test of HB, so have anti-scratch characteristic.In addition, the elastic microstructured layers of above-mentioned tool also has antiwear characteristic, and rubbing with ASTM D4060 method, (CS-10 takes turns in test; 1,000g, 1; 000 revolution), loss is lower than 100mg, and preferred person's loss is lower than 50mg; better person's loss is lower than 25mg; so can avoid optical element by scratch or scratch adjacent optical elements, and cause brightness decline or influence video picture character, and because the elastic microstructured layers of optical element tool; so can exempt to use diaphragm, reduce manufacturing cost.Above-mentioned glass transition temperature can be measured by the known method of any general technical staff of the technical field of the invention, such as: differential scanning calorimetry (DSC), modulation DSC or dynamic mechanical analysis (DMA).
The second surface of base material of the present invention is to be positioned at the opposite side of base material with respect to this microstructured layers, and it can be a surface of the former film of base material, or can process on this surface by any usual manner.Above-mentioned job operation such as but not limited to: be coated with second coating at this base material,, make this second surface be planar structure through solidifying to form a plane coating; Or with coating method elder generation coating second coating, with the roller of surperficial tool concaveconvex structure, on second coating, solidify to form one in the embossing mode and have the coating of concave-convex micro-structure again, make this second surface be concaveconvex structure, the light diffusion effect is provided by this.The thickness of above-mentioned coating there is no particular restriction, normally between about 0.5 micron to about 30 microns, preferably between about 1 micron to about 10 microns.
According to a preferred implementation of the present invention, be by after being coated with second coating at base material, utilize the sandblast roller in the embossing mode, impress out concaveconvex structure, again through solidified forming, make this second surface have the concaveconvex structure that does not contain diffusion particle.
Be to promote the optical element atomizing effect, make light pass through homogenize more behind the optical element, can optionally make above-mentioned second coating comprise bead (beads), increasing the light diffusion, it is such as but not limited to glass beads; The metal oxide bead is such as but not limited to titania (TiO
2), silicon dioxide (SiO
2), zinc paste (ZnO), aluminium oxide (Al
2O
3), zirconia (ZrO
2) or its potpourri; Or plastic beads, such as but not limited to acrylate resin (acrylate resin), styrene resin (styrene resin), urethane resin (urethane resin), silicone resin (silicone resin) or its potpourri, be preferably acrylate resin or silicone resin; Or its combination.The shape of above-mentioned bead there is no particular restriction, for example can be sphere, rhombus, ellipse, grain of rice shape, biconvex lens shape (biconvex lenses) etc., and its mean grain size is between about 1 micron to about 10 microns.The mist degree of coating (haze) can be by the control of bead content, and according to the present invention, bead is the bead of about 0.1 weight portion of per 100 weight portions, second coating solid to about 10 weight portions with respect to the amount of the second coating solid.
According to another preferred implementation of the present invention, be by second coating that contains bead in the base material coating, with its solidified forming, make this second surface form the concaveconvex structure that includes diffusion particle.
In general, if the optical element mist degree is too high, can influence the luminance gain value of optical element integral body.But mist degree is low excessively, and the light diffusion is not enough again, therefore, does not exist under the situation of any structure at the first surface of base material, measures according to JIS K7136 standard method, records mist degree and is preferably and is not less than 3%, more preferably 10% to 70%.
Fig. 4 to 7 is the synoptic diagram of the embodiment of optical element of the present invention.
Shown in Fig. 4 (a), optical element of the present invention comprises a base material 40, the first surface 41 of base material 40 comprises the prism structure 411 at a plurality of tool circular arcs top, and these prism structures are linear column structure and parallel to each other, and the second surface 42 of this optical element is to be a plane.
Shown in Fig. 4 (b), optical element of the present invention comprises a base material 40, the first surface 41 of base material 40 comprises the prism structure 411 at a plurality of tool circular arcs top, these prism structures are linear column structure and parallel to each other, and the second surface 42 of this optical element has the concaveconvex structure 421 that does not contain diffusion particle.
Shown in Fig. 5 (a) and 5 (b), optical element of the present invention comprises a base material 50, the first surface 51 of base material 50 comprises the prism structure 511 at a plurality of tool circular arcs top, and wherein plural at least prism structure is not parallel to each other 511 each other ', the second surface 52 of this optical element is to be a plane.
Shown in Fig. 6 (a) and 6 (b), optical element of the present invention comprises a base material 60, the first surface 61 of base material 60 comprises the prism structure 611 at a plurality of tool circular arcs top, wherein plural at least prism structure is not parallel to each other 611 each other ', the second surface 62 of this optical element has the concaveconvex structure 621 that does not contain diffusion particle.
Shown in Fig. 7 (a) and 7 (b), optical element of the present invention comprises a base material 70, the first surface 71 of base material 70 comprises the prism structure 711 at a plurality of tool circular arcs top, wherein plural at least prism structure is not parallel to each other 711 each other ', the second surface 72 of this optical element has the concaveconvex structure 721 that includes diffusion particle 722.
First coating of the present invention can be identical or inequality with second coating, and each self-contained at least a resin that is selected from by group that ultraviolet curable resin, thermoset resin, thermoplastic resin and composition thereof constitute is preferably ultraviolet curable resin.
Be applicable to that ultraviolet curable resin of the present invention is the acrylate that contains one or more functional groups, be preferably the multi-functional acrylate of tool.Can be used for acrylate of the present invention such as but not limited to (methyl) acrylate ((meth) acrylate), as 2-hydroxyl-3-benzene oxygen propyl group acrylate; Urethane acrylate (urethane acrylate) is as aliphatic carbamate acrylate (aliphatic urethane acrylate), aliphatic carbamate six acrylate (aliphatic urethane hexaacrylate) or aromatic amino ester formate six acrylate (aromatic urethane hexaacrylate); Polyester acrylate (polyester acrylate) is as polyester diacrylate (polyester diacrylate); Epoxy acrylate (epoxy acrylate), as bisphenol-A epoxy diacrylate (bisphenol-A epoxy diacrylate), phenolic aldehyde epoxy acrylate (novolac epoxy acrylate); Or its potpourri.Be preferably urethane acrylate, epoxy acrylate or they's combination.
Be applicable to that commercial acrylate of the present invention comprises: produced by Sartomer company, commodity are by name
Or
The person; Produced by Eternal company, commodity are by name
The person; And by UCB. S.A.'s production, commodity are called Ebecryl
, Ebecryl
, Ebecryl
Or Ebecryl
Person etc.
Be applicable to thermoset resin of the present invention, its weight average molecular weight is generally between about 10
4To about 2 * 10
6Between, preferably between about 2 * 10
4To about 3 * 10
5Between, better between about 4 * 10
4To about 10
5Between.Thermoset resin of the present invention optional from contain carboxyl (COOH) and/or hydroxyl (group that vibrin OH), epoxy resin, poly-(methyl) acrylate resin, polyamide, fluorine resin, polyimide resin, urethane resin, alkyd resin (alkyd resin) and composition thereof are formed is preferably poly-(methyl) acrylate resin that contains carboxyl and/or hydroxyl.
Be applicable to the optional autopolyester resin of thermoplastic resin of the present invention; Polymethacrylate resin is as polymethylmethacrylate (PMMA); And the group that forms of they's potpourri.
First coating of the present invention and/or second coating can optionally comprise any general technical staff of the technical field of the invention's known additives, and it is such as but not limited to thinning agent (diluent), light trigger (photoinitiator), lubrication prescription (slip agent), solvent (solvent), antistatic agent (antistatic agent), leveling agent (levelling agent), stabilizing agent (stabilizingagent), fluorescer (fluorescent brightener) or ultraviolet light absorber (ultravioletabsorber).
Too high for the molecular weight of avoiding coating, viscosity is too big, so that the operability variation, shortcomings such as levelability is bad is arranged when being easy to be coated with, and can optionally add thinning agent, to adjust the viscosity of coating.Be applicable to that thinning agent of the present invention can be simple function group or multi-functional acrylic ester monomer, it is such as but not limited to being selected from following group: (methyl) acrylate, 2-phenoxyethyl acrylate (2-phenoxyl ethyl acrylate), ethoxy ethoxy ethyl propylene acid esters (2-(2-ethoxyethoxy) ethyl acrylate; EOEOEA), cumenyl phenoxyethyl acrylate (cumyl phenoxyl ethyl acrylate), 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), 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), ethoxyquin bisphenol a dimethacrylate (ethoxylated bisphenol-A dimethacrylate), trimethylolpropane tris (methyl) acrylate (trimethylol propane tri (meth) acrylate), three (acrylyl oxy-ethyl) isocyanuric acid ester (tris (acryloxyethyl) isocyanurate), the third oxidation neopentylglycol diacrylate (propoxylated neopentyl glycol diacrylate), ethoxyquin trimethylolpropane triacrylate (ethoxylated trimethylolpropane triacrylate), the third oxidation trimethylolpropane triacrylate (propoxylated trimethyloipropane triacrylate), pentaerythritol triacrylate (pentaerythritol triacrylate), dipentaerythritol acrylate (dipentaerythritol hexaacrylate; DPHA) and they's combination.Preferably be selected from 2-phenoxyethyl acrylate, pentaerythritol triacrylate, ethoxyquin bisphenol a dimethacrylate, ethoxy ethoxy ethyl propylene acid esters, dipentaerythritol acrylate and they's combination.
The example that is applicable to commercially available thinning agent of the present invention comprises: produced by Eternal company, commodity are by name
And
The person; And produced commodity A-LEN10 by name or A-BPEFA person etc. by Xin Zhong village company.
According to the present invention, can in first coating or second coating, add thinning agent with alkoxy.The elasticity coefficient (elasticmodulus) that thinning agent with alkoxy can be adjusted behind the paint solidification makes the structure of gained have preferable pliability and rebound resilience, therefore can increase the resistance to scraping of optical element.
Be applicable to that light trigger of the present invention there is no particular restriction, be after rayed, can produce free radical, and see through the transmission initiated polymerization person of free radical.It for example can be selected from 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-trimethylbenzoyl diphenyl phosphine oxide (2,4,6-trimethylbenzoyl diphenyl phosphine oxide; TPO) and combination constitute group, preferably benzophenone.
For increasing the lubricity after solidifying, first coating of the present invention and/or second coating can optionally comprise lubrication prescription.Be applicable in the group that lubrication prescription of the present invention is made up of amide resin, acrylate resin, cycloalkanes esters of gallic acid (naphthenates), silicone resin and fatty alcohol resin and select, be preferably cycloalkanes ester class or silicone resin.Commercially available this type of lubrication prescription example comprises: Tego company produces, and commodity are called Rad.
For avoiding because of the structural collapse phenomenon influences optical property, first coating of the present invention and/or second coating can optionally add inorganic filler.In addition, inorganic filler also has the effect of the briliancy (brightness) that promotes panel of LCD.Be applicable to that inorganic filler of the present invention is to be general technical staff of the technical field of the invention institute well known, it is preferably zinc paste, silicon dioxide, zirconia, titania or its potpourri such as but not limited to zinc paste, silicon dioxide, strontium titanates, zirconia, aluminium oxide, lime carbonate, titania, calcium sulphate, barium sulphate or its potpourri.Above-mentioned inorganic filler has the particle size of about 10 nanometers to about 350 nanometers, is preferably between about 50 nanometers between about 150 nanometers.
When using thermoset resin or thermoplastic resin, can optionally add solvent.Can be used for solvent of the present invention, is the personage institute well known of being familiar with this technology, and it for example can be benzene class, ester class or ketone or its potpourri.The limiting examples of benzene kind solvent comprises, benzene, o-xylene, m-xylene, P-xylene, trimethylbenzene or styrene or its potpourri.The limiting examples of esters solvent is as comprising ethyl acetate, butyl acetate, diethyl carbonate, ethyl formate, methyl acetate, ethoxyethyl acetate(EA), acetate ethoxy propyl ester or monomethyl ether propylene glycol ester or its potpourri.The limiting examples of ketones solvent comprises acetone, methyl ethyl ketone or methyl isobutyl ketone or its potpourri.
According to a preferred implementation of the present invention, first coating of the present invention and/or second coating comprise ultraviolet curable resin, have the thinning agent and the light trigger of alkoxy.
Optical element of the present invention has at least 1.5 high index of refraction, preferably is about between 1.52 to 1.65, so the good optical yield value can be provided; And because of not halogen-containing in the coating; do not pollute the environment; in addition; structure has rebound resilience on first and/or the second surface of the prepared optical element of the present invention; can avoid transport or operating process in by scratch; so need not paste the effect that diaphragm can reach protection, save sticking, as to tear diaphragm processing procedure.Optical element of the present invention can be used in the light source device, and for example advertising lamp box, flat-panel screens or LED light fixture etc. especially can be used in the backlight module of straight-down negative, as even light optical element or anti-scratch optical element.Optical element of the present invention has the effect of even light and optically focused, and because of having good rebound resilience, so can keep away self by scratch or adjacent other element of scratch.
Following examples will at optical element of the present invention with and preparation method thereof further instruction is provided.
Embodiment
＜anti-lamp Mura test 〉
Optical measurement embodiment
The light source that can use for display to provide is provided under the backlight module for several fluorescent tubes direct type backlight module.The light source that direct type backlight module provided is a line source, if the even light effect deficiency of the optical element that collocation is used will produce the light and shade striped because of the fluorescent tube arrangement mode, this situation is called " Lamp Mura ", has a strong impact on the development quality.
In the conventional art field Lamp Mura be there is no the tabular form mode of quantification, only depend on naked eyes to judge and differentiate, can't specifically assess Lamp Mura.The invention provides a kind of method that backlight module light uniformity coefficient is quantized, can obtain briliancy by special calculating and evenly be worth, and assess the elimination degree of Lamp Mura by the size that briliancy evenly is worth.
Method of the present invention is as follows:
1. backlight module is divided into left side, central authorities and three districts, right side.
2. get the vertical central axis in each district, the brightness value of a plurality of test points on the measurement axis.
3. distinguish Jiang Ge district vertical central axis gained brightness value, carry out standardization in the following manner:
L: the brightness value of each test point on a certain vertical central axis;
L
Min: reckling in the brightness value of each test point on a certain vertical central axis;
L
d＝L-L
min；
L
Dmax: L
dMiddle the maximum;
L
nor＝L
d/L
dmax。
With each point on the vertical central axis of middle section through standardized brightness value (L
Nor) to the mapping of the position of this point, can get the briliancy synoptic diagram (Fig. 9 and 10 will in hereafter) of Fig. 9 for example or 10, standardized brightness value is wavy distribution with the position of each point.
5. after getting rid of the bigger data of this central shaft two-end-point otherness, get L in each ripple
NorMinimum value is its trough value, and maximal value is its crest value, obtains the L of each ripple
NorMinimum value and L
NorPeaked ratio.
6. with the L of all ripples of step 5 gained
NorMinimum value and L
NorAverage after the peaked ratio addition, can get a briliancy and evenly be worth (S
C), evenly be worth in order to the briliancy of representing this middle section.
7. repeating step 4 to 6, and the acquisition left side reaches and the briliancy on right side evenly is worth back (S
LAnd S
R), (S=(S averages after the briliancy in left side, central authorities and three districts, right side evenly is worth addition
C+ S
L+ S
R)/3), the briliancy that can obtain backlight module integral body evenly is worth (S).
When briliancy evenly is worth (S) more near 1, represent that briliancy trough value and crest value difference are more little, Lamp Mura phenomenon is not obvious more.Otherwise when briliancy evenly is worth (S) more hour, the difference of expression briliancy trough value and crest value is big more, and then Lamp Mura phenomenon is obvious.
Embodiment 1
With commercial coating A (model
, Changxing chemical company sells) and coat (model on a polyethylene terephthalate (PET) base material
, TORAY company produces) and form coating, and utilize roller embossing mode on this coating, to form the prism structure at a plurality of tool circular arcs top, again with UV energy (350mJ/cm
2) radiation exposure, make it to solidify, make a microstructured layers.Obtained microstructured layers has 40 microns thickness, and these prism structures have 50 microns width and the radius-of-curvature at its top (R) is 10 microns.
Coating A is coated on the base material with respect to the opposite side (second optical surface) of this microstructured layers forming coating, and utilize roller embossing mode to form concavo-convex decorative pattern on coating, the while is with UV energy (350mJ/cm
2) radiation exposure, make it to solidify.Prepared coating has concaveconvex structure and its thickness is 10 microns.
Following examples preparation method is the same, only changes the structure of microstructured layers.
Embodiment 2
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 60 microns width and the radius-of-curvature at its top (R) is 7 microns; Second optical surface of this optical element has concaveconvex structure.
Embodiment 3
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 60 microns width and the radius-of-curvature at its top (R) is 5 microns; Second optical surface of this optical element has concaveconvex structure.
Embodiment 4
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 50 microns width and the radius-of-curvature at its top (R) is 5 microns; Second optical surface of this optical element has concaveconvex structure.
Embodiment 5
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 50 microns width and the radius-of-curvature at its top (R) is 5 microns.In addition, second optical surface of this optical element is without coating.
Embodiment 6
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 50 microns width and the radius-of-curvature at its top (R) is 3 microns; Second optical surface of this optical element has concaveconvex structure.
Embodiment 7
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 50 microns width and the radius-of-curvature at its top (R) is 2 microns; Second optical surface of this optical element has concaveconvex structure.
Embodiment 8
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at a plurality of tool circular arcs top and has 40 microns thickness, and these prism structures have 60 microns width and the radius-of-curvature at its top (R) is 5 microns; Second optical surface of this optical element has concaveconvex structure, and contains bead (Beads, ponding changes into company and produces, model SSX-102) in this structure.
Embodiment 9
Use the method for embodiment 1 to prepare an optical element.The microstructured layers of this optical element comprises the prism structure at angle, a plurality of tools pinnacle (being that R is 0 micron) and has 40 microns thickness, and these prism structures have 50 microns width; Second optical surface of this optical element has concaveconvex structure.
Embodiment 10
Commercially available optical element: Micro Lens (PTR-863, SHINWHA company).
As shown in Figure 8, " lamp box 80 that backlight module uses; this lamp house thickness is 24mm; this lamp box orlop is a supportive steel plate 85 attaches 81,16 CCFL fluorescent tubes 82 of reflector plate (only drawing lamp strip position among the figure; do not draw all fluorescent tubes) and on average disposes and be fixed in the reflector plate top; a diffuser plate 83 with supportive is placed on the fluorescent tube upper strata, and the optical element 84 with the foregoing description places the diffuser plate top again, obtains even light effect by this on the steel plate to prepare 1.Subsequently, using briliancy measuring instrument Topcon UA-1000 to carry out briliancy measures, and the optical element gained central point brightness value of embodiment 1 is defined as 100%, measure and calculate with institute's revealing method above again, the briliancy of computing module integral body evenly is worth S, and the gained result is shown in Fig. 9, Figure 10 and table 1.
Fig. 9 (, when this backlight module is only had supportive steel plate, reflector plate, fluorescent tube and diffuser plate) when not placing the optical element of any embodiment and comparative example, the brightness value standardization figure of the vertical central axis of the middle section of this backlight module.
Figure 10 is when placing the optical element of embodiment 1, the brightness value standardization figure of the vertical central axis of the middle section of this backlight module.
Comparison diagram 9 and Figure 10 place optical element of the present invention the difference of crest value and trough value is diminished as can be known, obviously promote the effect of eliminating Lamp Mura.
Table 1
| Embodiment | Prismatic width | ??R | Second optical surface | The center briliancy | The S value |
| ??1 | ??50 | ??10 | Concavo-convex | ??100％ | ??0.91502 |
| ??2 | ??60 | ??7 | Concavo-convex | ??104.7％ | ??0.91389 |
| ??3 | ??60 | ??5 | Concavo-convex | ??104.9％ | ??0.91279 |
| ??4 | ??50 | ??5 | Concavo-convex | ??104.0％ | ??0.91256 |
| ??5 | ??50 | ??5 | The plane | ??107.6％ | ??0.89358 |
| ??6 | ??50 | ??3 | Concavo-convex | ??105.6％ | ??0.90662 |
| ??7 | ??50 | ??2 | Concavo-convex | ??107.3％ | ??0.89406 |
| ??8 | ??60 | ??5 | Concavo-convex and contain bead | ??103.5％ | ??0.91560 |
| ??9 | ??50 | ??0 | Concavo-convex | ??112.0％ | ??0.88725 |
| ??10 | ??---- | Dome-type | Concavo-convex | ??99.4％ | ??0.91457 |
Comparing embodiment 2 and 3 or the result of comparing embodiment 1,4,6,7 and 9 as can be known, the radius-of-curvature that increases the circular arc top of microstructured layers can promote the effect of eliminating Lamp Mura, but performance has the counter productive of reduction for briliancy.In addition, comparing embodiment 3 and 4 result increase prismatic width and as can be known to eliminating not too big benefiting of Lamp Mura, but can promote the briliancy performance.Comparing embodiment 3 and 8 result as can be known, the coating of second optical surface contains diffusion particle and also helps to eliminate Lamp Mura.
＜Kang Gua ﹠amp; Wear-resisting test 〉
Generally speaking, the radius-of-curvature at circular arc top (R) is big more, and resistance to scraping is good more, but the briliancy performance is relatively poor.The present invention is except the prism structure that makes apparatus dome portion, use different formulation for coating material in addition, make microstructure have rebound resilience, increase its anti-scratch ability, therefore can not use excessive radius-of-curvature just can obtain good resistance to scraping, and reduce excessive radius-of-curvature harmful effect that briliancy caused.
The preparation of coating B, C and D
Prepare coating B, C and D according to mode described below, the composition of each prescription is listed as table 2.
At first, each component is mixed with the listed part by weight of table 2, under 50 ℃ temperature, with rotating speed 1,000rpm stirs, and forms coating B, C and D.
Table 2
(a): ultraviolet curable resin (Changxing company produces,
)
(b): ultraviolet curable resin (Changxing company produces,
)
(c): thinning agent (Changxing company produces,
)
(d): thinning agent (Changxing company produces,
)
(e): thinning agent (Changxing company produces,
)
(f): (Ciba company produces light trigger, I184)
(g): ultraviolet curable resin (Changxing company produces,
)
Preliminary work:
Coating D is coated (model on a polyethylene terephthalate (PET) base material
TORAY company produces) form coating, utilize sandblast roller embossing mode on this coating, to form concaveconvex structure then, again with UV energy (350mJ/cm
2) this coating of radiation exposure, make it to solidify, make second optical surface of a tool concaveconvex structure.
Embodiment 11
First optical surface of coating B being coated above-mentioned base material forms coating, utilizes roller embossing mode to form the prism structure at a plurality of tool circular arcs top then on this coating, again with UV energy (350mJ/cm
2) this coating of radiation exposure, make it to solidify, make a microstructured layers.Obtained microstructured layers has 40 microns thickness, and the radius-of-curvature at these prism structure tops (R) is 10 microns, and prismatic width is 60 microns.
Use the method for embodiment 11, prepare preparation respectively with coating B and have the microstructured layers that top radius-of-curvature (R) is 5,3,2 and 0 microns a prism structure (fixed thickness of microstructured layers is 40 microns, and prismatic width is fixed as 60 microns).
Use the method for embodiment 11, change with coating C preparation preparation and have the microstructured layers that top radius-of-curvature (R) is 5 microns a prism structure (fixed thickness of microstructured layers is 40 microns, and prismatic width is fixed as 60 microns).
Embodiment 17
Commercially available product 3M BEF III.
Method of testing:
The measurement of the radius-of-curvature at top (R): the radius-of-curvature at the MM400-Lu metaloscope RLM615 apparatus measures prism structure top that provides with NIKON company, the gained outcome record is in table 3.
Pencil hardness test: utilize pencil scratching tester [Elcometer 3086, SCRATCHBOY], with the pencil hardness of Mitsubishi pencil with JIS K-5400 method test microstructured layers, the gained outcome record is in table 3.
Microstructured layers refractive index test: the AUTOMATIC REFRACTOMETER GPR11 that provides by Index Instruments company
The refractive index of apparatus measures microstructured layers, the gained outcome record is in table 3.
Glass transition temperature (Tg) test: the DSC7 instrument that is provided by PerkinElmer Instruments company is measured the glass transition temperature of microstructured layers, and the gained outcome record is in table 3.
Anti-scratch test: (area length and width 20mm * 20mm) goes up and pastes sticking diaphragm to be measured (the length and width 20mm * 20mm) that puts in 350 g weight platform to utilize linear abrasion wear test machine [TABER 5750], make its microstructured layers up, use the second surface of another diaphragm of the same race, with test trip 0.5inch, the speed of 10cycle/min is carried out the anti-scratch test of 10cycles, whether observe this microstructured layers and this second surface has by scratch, if both all do not have scratch, and then can be by test.Shown in the following tabulation 3 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 ASTMD4060 (CS-10 wheel, 1,000g, 1,000 revolution) tests this microstructured layers.
Table 3
| Embodiment | ??R | Coating | The microstructured layers refractive index | Pencil hardness | ??Tg | Anti-scratch test | Abrasion test |
| ??11 | ??10μm | ??B | ??1.507 | ??HB | ??20℃ | ??○ | ??○ |
| ??12 | ??5μm | ??B | ??1.507 | ??HB | ??20℃ | ??○ | ??○ |
| ??13 | ??3μm | ??B | ??1.507 | ??HB | ??20℃ | ??○ | ??○ |
| ??14 | ??2μm | ??B | ??1.507 | ??B | ??20℃ | ??× | ??× |
| ??15 | ??0μm | ??B | ??1.507 | ??B | ??20℃ | ??× | ??× |
| ??16 | ??5μm | ??C | ??1.548 | ??6B | ??42℃ | ??× | ??× |
| ??17 | ??0μm | ??- | ??- | ??B | ??78℃ | ??× | ??× |
Zero: by test
*: not by test
By the result of embodiment 11 to 15 as can be known, when using coating B to form microstructured layers, as R during greater than 3 microns, the loss in weight of friction test is less than 100mg, can test and microstructure can be by scratch by pencil hardness HB again.
By the result of embodiment 17 as can be known, commercially available product BEF III the glass transition temperature of microstructured layers be higher than 40 ℃, can't be by pencil hardness HB test, microstructure can be by scratch.
The big more resistance to scraping of R value is good more, but the R value can be sacrificed the performance of optical element briliancy too greatly again.Also makes microstructured layers have resistance to scraping so desire reduces the R angle, the flexibility of microstructured bodies is one of important invention characteristics.Among the embodiment 12 and 16, the radius-of-curvature at prism structure top is 5 microns.Embodiment 12 uses coating B to prepare microstructured layers, its prepared microstructured layers than softness and glass transition temperature less than 40 ℃, can be by anti-scratch test of the present invention.Otherwise embodiment 16 uses coating C to prepare microstructured layers, and prepared microstructured layers is rigidity comparatively, and its glass transition temperature can't be by anti-scratch test of the present invention up to 42 ℃.
Claims (12)
1. optical element, it comprises
(a) base material;
(b) be positioned at the first surface of base material one side, this first surface comprises the prism structure at a plurality of tool circular arcs top, and the radius-of-curvature at these circular arc tops is 3 microns to 20 microns; And
(c) be positioned at the second surface of base material opposite side, this second surface can be a plane or has concaveconvex structure.
2. optical element as claimed in claim 1, wherein plural at least prism structure is not parallel to each other each other.
3. optical element as claimed in claim 2, wherein these prism structures that are not parallel to each other are to be the form that has intersected or do not intersected.
4. optical element as claimed in claim 1, wherein this second surface has concaveconvex structure.
5. optical element as claimed in claim 4, wherein this second surface has the concaveconvex structure that does not contain diffusion particle.
6. optical element as claimed in claim 4, wherein this second surface has the concaveconvex structure that includes diffusion particle.
7. optical element, it comprises:
(a) base material;
(b) be positioned at the first surface of this base material one side, this first surface comprises the prism structure at a plurality of tool circular arcs top, and the radius-of-curvature at these circular arc tops is 3 microns to 20 microns; And
(c) be positioned at the second surface of base material opposite side, this second surface has concaveconvex structure,
Wherein these prism structures have the glass transition temperature less than 40 ℃.
8. optical element as claimed in claim 7, wherein this optical element does not exist under the situation of any structure at the first surface of base material, measures according to JIS K7136 standard method, and mist degree is not less than 3%.
9. optical element as claimed in claim 7, wherein these prism structures can be by the pencil hardness test of HB with the test of JIS K-5400 method.
10. optical element, it comprises:
(a) base material;
(b) be positioned at the first surface of this base material one side, this first surface comprises the prism structure at a plurality of tool circular arcs top, and the radius-of-curvature at these circular arc tops is 3 microns to 20 microns; And
(c) be positioned at the second surface of base material opposite side, this second surface can be a plane or has concaveconvex structure,
Wherein these prism structures are with the test of ASTM D4060 method (CS-10 wheel, 1,000g, 1,000 revolution), and loss is lower than 100mg.
11. as the optical element of claim 10, wherein these prism structures can be by the pencil hardness test of HB with the test of JIS K-5400 method.
12. a direct type backlight module, it comprises as each optical element in the claim 1 to 11.
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100852A (en) * | 2013-04-09 | 2014-10-15 | 中蓝光电科技（上海）有限公司 | LED illuminating device with micro-structure optical film |
| CN105116598A (en) * | 2015-09-11 | 2015-12-02 | 青岛海信电器股份有限公司 | Backlight module, prismatic lens and television set |
| CN108445021A (en) * | 2018-03-06 | 2018-08-24 | 浙江工业大学 | Microstructured prisms lens quality detecting system |
| CN108490002A (en) * | 2018-03-06 | 2018-09-04 | 浙江工业大学 | A kind of microstructured prisms lens quality detection method |
| CN110268311A (en) * | 2017-01-04 | 2019-09-20 | 3M创新有限公司 | For enhancing the light control film with turning film and the even mating plate of lenticular of view in a horizontal plane |
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2009
- 2009-09-27 CN CN200910177640A patent/CN101661123A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100852A (en) * | 2013-04-09 | 2014-10-15 | 中蓝光电科技（上海）有限公司 | LED illuminating device with micro-structure optical film |
| CN105116598A (en) * | 2015-09-11 | 2015-12-02 | 青岛海信电器股份有限公司 | Backlight module, prismatic lens and television set |
| CN105116598B (en) * | 2015-09-11 | 2018-09-28 | 青岛海信电器股份有限公司 | A kind of backlight module, prismatic lens and television set |
| CN110268311A (en) * | 2017-01-04 | 2019-09-20 | 3M创新有限公司 | For enhancing the light control film with turning film and the even mating plate of lenticular of view in a horizontal plane |
| CN108445021A (en) * | 2018-03-06 | 2018-08-24 | 浙江工业大学 | Microstructured prisms lens quality detecting system |
| CN108490002A (en) * | 2018-03-06 | 2018-09-04 | 浙江工业大学 | A kind of microstructured prisms lens quality detection method |
| CN108490002B (en) * | 2018-03-06 | 2021-02-26 | 浙江工业大学 | Method for detecting quality of microstructure prism lens |
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