CN106154367A - A kind of light diffusing sheet and preparation method - Google Patents
A kind of light diffusing sheet and preparation method Download PDFInfo
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- CN106154367A CN106154367A CN201610707423.6A CN201610707423A CN106154367A CN 106154367 A CN106154367 A CN 106154367A CN 201610707423 A CN201610707423 A CN 201610707423A CN 106154367 A CN106154367 A CN 106154367A
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- diffusion particle
- light diffusing
- diffusing sheet
- microstructured layers
- diffusion
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a kind of light diffusing sheet and preparation method.The architectural feature of light diffusing sheet is, transparent substrate layer, and the side surface in described transparent substrate layer is provided with microstructured layers, is filled with diffusion particle in the sunk structure of microstructured layers.In order to realize this diffusion sheet, its preparation method is characterised by, by the mould with topological arrangement pattern bulge-structure, the mode that is imprinted with replicates above-mentioned mould structure on a transparent substrate, it is thus achieved that the sunk structure complementary with mould structure；By doctor blade technique, diffusion particle is scratched the micro-structural into above-mentioned depression, form the arrangement of patterned diffusion particle.The present invention is arranged by graphical diffusion particle, solve tradition random structure can not the problem of artificial optimization, under patterned structures and diffusion particle act on jointly, produce light diffusion effect, be used for backlight and beam shaping direction.
Description
Technical field
The present invention relates to a kind of light diffusing sheet, its structure is for filling light diffusion particle in graphical microstructured groove.?
Patterned structures and diffusion particle act on down jointly, produce light diffusion effect, are used for backlight and beam shaping direction.
Background technology
Light diffusing sheet is requisite assembly in display and lighting field.Its Main Function is to make light diffusion, will
Point/line source is uniformly converted to line/area source.Conventional diffusion piece forms diffusion by adding chemical particle in transparent plastic material
Layer, in diffusion layer, incident ray, at the different Propagation of two or more refractive indexes, reflects, reflects and scatters,
Form the effect of diffusion light.
At present, light diffusing sheet mainly has three kinds of processing methods: embossing is processed, is heat-treated injection molding and coating process.Embossing work
Polymer melting in film surface, is utilized the roller of most fine structure to process by skill, and method is easy, but the main of it lacks
Point is to cause diffusion barrier density of material uneven.Heat treatment injection molding, its main material includes methyl methacrylate, azo
Two is different fine, spreads powder and dyestuff etc..It through being thoroughly mixed, is injected in mould, then use baking oven baking-curing, at least 4
～8 hours, the production cycle was long.The most common method producing diffusion barrier is coating process, and diffusion layer is formed by electrostatic applications
In transparent substrates surface.This method comparative maturity in technique, but employ multiple macromolecular material, as adhesion material is
Hot plastic type macromolecule resin (monomer of methacrylate or condensate, polyester, Merlon, polystyrene, poly-methylpent
Alkene), in addition it is also necessary to olefin(e) acid esters, light initiator, diffusion powder, dyestuff, toughener, wetting agent, defoamer etc..Further, due to
Add the thickness that diffusion layer increases diffusion sheet in substrate, use multiple polymers to cause bigger light energy absorption to be lost, producing
The organic pollution of middle generation, is unfavorable for environmental protection.
With being widely used of the novel solid light sources such as light emitting diode, except requiring that matched light diffusing sheet has
High permeability, the mist degree being easy to adjustment, also require to be capable of imitating with special optics such as orienting diffusion without the sheen of " focus "
Really, research and development and manufacture for light diffusing sheet propose new technological challenge.
Constantly progressive minute manufacturing technology makes mass manufacture large format micro-nano structure be possibly realized.At plastic basis material
Surface Machining has the micro-nano structure of certain topological arrangement as light diffusing sheet, meets optical functional film lightening, flexible
The requirement of change, functionalization, high-light-energy utilization rate, low cost and production process low energy consumption, becomes a new generation's optical functional film
Favorite.Based on the light diffusing sheet of surface micro-structure, two classes also can be subdivided into: a class is completely random structure.For example, random micro-
Lens array structure.Although it can realize diffusion and softening well to light, but due to the randomness of its scattering unit arrangement, only
The demand of a certain class blooming can be met, such as the light diffusing sheet using in LCD TV.Another kind of is the structure of regular array, logical
Cross the topology arrangement of design micro-nano structure, it is achieved the optical effects such as the directional scattering of optimization and sheen, it is thus achieved that random arrangement is difficult to
The function realizing.Optimize the micro-structural diffusion sheet after design and there is greater flexibility and extensive adaptability, will be in a new generation
The light modulation of Organic Light Emitting Diode, solar cell etc. and boost device efficiency of light energy utilization aspect play a significant role.
The micro-structural diffusion sheet of the optimization topological arrangement of research at present, such as document [1] S.M.Mahpeykar, et
al.Stretchable hexagonal diffraction gratings as optical diffusers for in
Situ tunable broadband photon management, Adv.Opt.Mater.4 (7): 1106-1114,2016) report
Road, at the polystyrene of the upper self assembly honeycomb dense arrangement of dimethyl silicone polymer (polydimethylsiloxane, PDMS)
(Polystyrene, PS) micron ball, utilizes the tensility of PDMS, it is achieved the light field of tunable diffraction angle.Document [2]
C.L.Lai,J.S.Lin,T.Yoshimi,and W.H.Fan,A microstructure diffuser plate for LED
The light diffusing sheet that lighting, Proc.SPIE 6758,2007. reports rule microlens array making is dizzy for preventing LED
Light, employs self-organizing method honeycomb dense arrangement polystyrene micron bead on substrate equally.Self-organizing method is not suitable for
Make large area structure template.Document [3] T.C.Huang1, J.R.Ciou1, P.H.Huang1, K.H.Hsieh, and Sen-
Yeu Yang Fast fabrication of integrated surface-relief and particle-diffusing
Plastic diffuser by use of a hybrid extrusion roller embossing process, Optics
Express 16 (1), 440-447,2008. report a kind of light diffusing sheet by mixing micro-structural and doping particle and making thereof
Method.Its technology path is to utilize melt extruder by the Merlon mixed with PMMA diffusion particle through the roller with micro-structural
Wheel, obtains integrated-type light diffusing sheet after cooling solidification.The method complex process melt extruding, equipment needed thereby is expensive.
Content of the invention
It is an object of the invention to provide the light diffusing sheet of a kind of diffusion particle with graphical arrangement, and making side
Method.The design of the light diffusing sheet of the present invention is, makes sunk structure on base material, the topology that these sunk structures preset present
Arrangement, such as square, hexagon, strip, the mode such as ring-type.Organic or inorganic material diffusion grain is filled in sunk structure
Son, diffusion particle can be spherical, elliposoidal, cylinder, cuboid, or other obform bodies, the refractive index of diffusion particle with
Base material, micro-nano structure layer are different with protective layer.Incident beam through diffusion sheet surface, the diffusion particle graphically being arranged
Impact, by reflecting, scatter, the optical phenomena such as diffraction, form the diffusion to light.
A kind of light diffusing sheet, it includes transparent substrate layer, and the side surface in described transparent substrate layer is provided with microstructured layers,
Described microstructured layers is provided with micro-structural, and described micro-structural is sunk structure, is filled with diffusion in the sunk structure of microstructured layers
Particle.
Wherein in an embodiment, in microstructured layers, micro-structural is recessed, is used for inducing diffusion particle to arrange, its arrangement
Mode can be wire grating, rectangle, annular and hexagon arrangement, or, planar symmetrically axle arrangement or flat
Arrangement in asymmetric shaft in face；Described diffusion particle arrangement state can be continuous or discrete.
Wherein in an embodiment, can be identical with substrate layer material to the material of microstructured layers therein, it is also possible to no
With.
Wherein in an embodiment, described sunk structure width is more than 1 micron, and depth-to-width ratio is more than 0.3.
It wherein in an embodiment, is filled with diffusion particle in the sunk structure of described microstructured layers, according to sunk structure
Topology arrangement and be distributed；Diffusion particle can be more than, be less than or equal to the characteristic size of sunk structure, and its shape can be
Spherical, elliposoidal, cylinder, cuboid, or other obform bodies.
Wherein in an embodiment, can be provided with transparent protective layer outside microstructured layers, protective layer is completely or portion
Diffusion particle is covered in subpackage.
Wherein in an embodiment, the diffusion particle being filled in the sunk structure of microstructured layers, its light refractive index with
Transparent substrate layer, microstructured layers, protective layer material or their specific refractivity absolute values of one of them are not less than 0.01.
The preparation method of a kind of light diffusing sheet, comprises the following steps:
S1, use there is the mould of bulge-structure, made over the transparent substrate by hot padding or ultraviolet stamping mode
Structure, obtains the sunk structure complementary with mould bulge-structure in microstructured layers；
S2 utilizes doctor blade technique, scratches diffusion particle in the sunk structure making in above-mentioned steps, is formed graphical
Diffusion particle arrangement.
Wherein in an embodiment, also include that step S3. applies protective layer on microstructured layers surface.
Wherein in an embodiment, the diffusion particle being filled in the sunk structure of microstructured layers, its light refractive index with
Transparent substrate layer, microstructured layers, protective layer material or their specific refractivity absolute values of one of them are not less than 0.01.
The present invention proposes a kind of novel light diffusing sheet structure and preparation method thereof.This diffusion sheet by micro-nano imprint and
Doctor blade technique makes, and utilizes the folding diffraction to light and the scattering process to light for the diffusion particle of micro-nano topological structure, it is achieved that fixed
To scattering and the function homogenizing hot spot.Micro-nano imprint technology is that one can be used for being prepared on a large scale large-area graphs micro-nano knot
The technology of structure, its machining resolution is only relevant with the size of reticle pattern, and not by the physics of optical lithography short exposure wavelength
Limit, the advantage with high-resolution, high production, low cost.Doctor blade technique realizes that diffusion particle is filled, and method is convenient, technique letter
Single, it is easy to accomplish mass production.
The graphical diffusion particle diffusion sheet induced as a kind of structure due to the utilization of technique scheme, the present invention,
Compared with prior art there are following two advantages:
1. realize multiple dimension can the diffusion particle of manual intervention and scattered optical field.The present invention utilizes patterned structures to lure
Lead, it is achieved that the graphical arrangement of diffusion particle, thus artificial optimization can design the scattering properties of a large amount of scattering particles, for example fixed
To the flexible soft light (soft light) of scattering and acquisition, carry out regulating and controlling more flexibly to light field, had and widely adapt to
Property.
2. technique is convenient reliably: combine impressing and doctor blade technique, the smooth and easy simplicity of whole technological process, it is easy to accomplish in batches
Changing and large format manufacture, being i.e. adapted to sheet material, be also applied for coiled material, equipment needed thereby is also cheap than extruding and hot melting equipment, runs into
This is lower.
Brief description
Fig. 1 is the light diffusing sheet structural representation of a kind of graphical arrangement light diffusion particle of the embodiment of the present invention one；
Wherein: the 11st, diffusion particle；12nd, substrate；13rd, micro-nano structure layer；14th, micro-nano structure
Fig. 2 a-d is the Making programme figure of the light diffusing sheet of the light diffusion particle of a kind of graphical arrangement of embodiment one；Figure
2a is the impressing mould in embodiment one；Fig. 2 b is to utilize impressing mould in embodiment one, obtains complementary therewith on base material
Sunk structure；Fig. 2 c is that the doctor blade technique that utilizes in embodiment one realizes the filling schematic diagram of diffusion particle；Fig. 2 d is to implement
Surface in example one has protective layer.
Wherein: the 21st, micro-nano structure layer；22nd, base material；23rd, diffusion particle；24th, protective layer
Fig. 3 is to realize the mould structure schematic diagram that sunk structure imprints in embodiment one；
Fig. 4 is to realize the another kind of mould structure schematic diagram that sunk structure imprints in embodiment one；
Fig. 5 is to realize the another kind of mould structure schematic diagram that sunk structure imprints in embodiment one；
Fig. 6 is to realize the another kind of mould structure schematic diagram that sunk structure imprints in embodiment one；
Fig. 7 be in embodiment three diffusion particle in situation about arranging in the way of multiple-level stack in sunk structure；
Fig. 8 is a kind of topological structure of the sunk structure filling diffusion particle in embodiment four；
Fig. 9 is the another kind of topological structure of the sunk structure filling diffusion particle in embodiment four；
Figure 10 is the another kind of topological structure of the sunk structure filling diffusion particle in embodiment four；
Figure 11 is the situation that in embodiment five, micro-nano structure layer is completely covered protective layer；
Wherein the 111st, protective layer
Figure 12 is the situation of micro-nano structure layer segment protective mulch in embodiment five.
Wherein the 121st, protective layer
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the invention will be further described:
Embodiment one: see shown in accompanying drawing 1, a kind of light diffusing sheet, the light diffusing sheet knot of graphical arrangement light diffusion particle
Structure schematic diagram.Making on the base substrate 12 has sunk structure 14, and these sunk structures 14 present default topological arrangement, such as pros
Shape, hexagon, strip, the mode such as ring-type, the width of sunk structure is more than 1 micron, and depth-to-width ratio is more than 0.3.In sunk structure 14
Filling organic or inorganic material diffusion particle 11, diffusion particle 11 can be spherical, elliposoidal, cylinder, cuboid, or
Other obform bodies of person, the refractive index of diffusion particle 11 is different from base material the 12nd, micro-nano structure layer 13 and protective layer, diffusion particle optics
Refractive index and transparent substrate layer, microstructured layers, protective layer material or they one of them specific refractivity absolute value be not little
In 0.01.Incident beam, through diffusion sheet surface, is affected by the diffusion particle 11 of graphical arrangement, by reflecting,
The optical phenomenas such as scattering, diffraction, form the diffusion to light.The feature sizes of diffusion particle 11 is 1～10 micron.Diffusion grain
Son is more than 0.01 with the absolute value of base material the 12nd, the refringence of micro-nano structure layer material the 13rd, one of protective layer material；Or they
The absolute value of refringence between any two is more than 0.05.
Embodiment two: see shown in accompanying drawing 2a-2d, the Making programme of a kind of light diffusing sheet that the present invention proposes.First make
Make the mould with topological arrangement pattern bulge-structure.Graphical bulge-structure mould in Fig. 2 a, available accomplished in many ways,
Such as mask lithography exposure, laser direct-writing, chemical attack or mechanical scratching etc..The material of mould can be metal material, as nickel,
Stainless steel, copper or metal alloy compositions, be organic material, such as Merlon, polyvinyl chloride, polyester, PFPE alkene, tetrafluoro
Ethylene copolymer and acrylic acid；For Inorganic Non-metallic Materials, such as silica, silicon, carbon steel, carborundum.Secondly, Fig. 2 b is profit
It is imprinted with the schematic diagram that mode makes sunk structure with mould on transparent base 22.Hot padding or ultraviolet pressure can be used
Print.Hot padding is will to be processed into pressing mold initially with hard pressing mold blank, then passes through hot mastication polymer matrix film 21, or
Person applies on polymer matrix film has the soft macromolecule polymer material 21 melting character of heat, puts it into marking press heating handle
Pressing mold is pressed on polymer matrix film with certain pressure, and then temperature is reduced near polymer freezing point, simultaneously pressing mold
Being separated with polymeric layer, substrate surface has been left with the structure with complementary structure on mould.The process of ultraviolet stamping basic with
Hot padding is identical, needs to use the polymer that can solidify under ultraviolet light irradiates as imprint layer materials, it is not necessary to use high temperature high
The mode of pressure, but require that die material (or baseplate material) is transparent to ultraviolet band.Again, Fig. 2 c is microstructured layers sunken inside
The structure filling schematic diagram of diffusion particle 23.By doctor blade technique, utilize scraper that diffusion particle is scraped the depression being filled in
In micrometer structure, form the diffusion particle of graphical arrangement.Finally, available transparent material is covered in micro-nano structure layer outer surface
As protective layer 24, and the outward appearance of surfacing can be realized.Refractive index and base material, micro-nano structure layer due to diffusion particle
There are differences with protective layer, the diffusion particle of graphical arrangement is by scatter incident light.
Embodiment three: see shown in accompanying drawing 3-4, a kind of light diffusing sheet that the present invention proposes, fill the depression of diffusion particle
Planform depends on the microstructure aspects of mould.Microstructure aspects is for example spherical, elliposoidal, triangular pyramid, rectangular pyramid etc., cross section
For circle, ellipse, triangle, quadrangle or other irregular polygons, the shape of diffusion particle can be filled all in the present invention
Within the scope of protection.Diffusion particle is filled in processed sunk structure, and its state is as shown in figures 5-6.When on mould
Structure when there is high-aspect-ratio, the sunk structure of microstructured layers also will have bigger depth-to-width ratio, and diffusion particle will be at depression knot
Arrange in the way of multiple-level stack, as shown in Figure 7 in structure.This provides an extra sky for the light modulation of design diffusion sheet
Between dimension.
Embodiment four: see shown in accompanying drawing 8-10, a kind of light diffusing sheet that the present invention proposes, fill the depression of diffusion particle
The topological structure of structure determines the distribution of light diffusion spot center.Its topological structure can be wire grating, as square,
Hexagon, strip, ring-type etc..
Embodiment five, sees shown in accompanying drawing 11-12, a kind of light diffusing sheet that the present invention proposes, permissible on micro-nano structure layer
Protective mulch 111 or 112, protective layer can be completely covered diffusion particle, or part covers diffusion particle.
Claims (10)
1. a light diffusing sheet, it is characterised in that: including transparent substrate layer, the side surface in described transparent substrate layer is provided with micro-
Structure sheaf, described microstructured layers is provided with micro-structural, and described micro-structural is sunk structure, fills in the sunk structure of microstructured layers
There is diffusion particle.
2. a kind of light diffusing sheet according to claim 1, it is characterised in that in microstructured layers, micro-structural is recessed, uses
In induction diffusion particle arrangement, its arrangement mode can be wire grating, rectangle, annular and hexagon arrangement, or, in plane
The inside symmetrically arrangement of axle or the planar arrangement in asymmetric shaft；Described diffusion particle arrangement state can continuously or from
Dissipate.
3. a kind of light diffusing sheet according to claim 2, it is characterised in that can be with to the material of microstructured layers therein
Substrate layer material is identical, it is also possible to different.
4. a kind of light diffusing sheet according to claim 1, it is characterised in that described sunk structure width is more than 1 micron, deeply
Wide ratio is more than 0.3.
5. a kind of light diffusing sheet according to claim 1, it is characterised in that fill in the sunk structure of described microstructured layers
There is diffusion particle, be distributed according to the topology arrangement of sunk structure；Diffusion particle can be more than, be less than or equal to sunk structure
Characteristic size, its shape can be spherical, elliposoidal, cylinder, cuboid, or other obform bodies.
6. a kind of light diffusing sheet according to claim 1, it is characterised in that can be provided with transparent outside microstructured layers
Protective layer, protective layer is completely or partially coated with diffusion particle.
7. a kind of light diffusing sheet according to claim 5, it is characterised in that be filled in the sunk structure of microstructured layers
Diffusion particle, its light refractive index and transparent substrate layer, microstructured layers, protective layer material or their refractions of one of them
The difference absolute value of rate is not less than 0.01.
8. the preparation method of a light diffusing sheet, it is characterised in that comprise the following steps:
S1, use there is the mould of bulge-structure, make structure over the transparent substrate by hot padding or ultraviolet stamping mode,
The sunk structure complementary with mould bulge-structure is obtained in microstructured layers；
S2 utilizes doctor blade technique, scratches diffusion particle in the sunk structure making in above-mentioned steps, forms patterned expansion
Shot arrangement.
9. the preparation method of a kind of light diffusing sheet according to claim 8, it is characterised in that also include step S3. micro-
Structure sheaf surface applies protective layer.
10. the preparation method of a kind of light diffusing sheet according to claim 9, it is characterised in that be filled in microstructured layers
Diffusion particle in sunk structure, its light refractive index and transparent substrate layer, microstructured layers, protective layer material or they its
One of specific refractivity absolute value be not less than 0.01.
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| CN108614315A (en) * | 2018-07-06 | 2018-10-02 | 深圳市光科全息技术有限公司 | A kind of optical diffusion film |
| CN109177134A (en) * | 2018-08-15 | 2019-01-11 | 信利光电股份有限公司 | A kind of imprint mold preparing diffusion sheet and a kind of diffusion sheet |
| CN109856714A (en) * | 2018-10-23 | 2019-06-07 | 友达光电股份有限公司 | The display of light leakage prevention film assembly and application the light leakage prevention film assembly |
| TWI679474B (en) * | 2018-10-23 | 2019-12-11 | 友達光電股份有限公司 | Anti-light leakage film assembly and display device using thereof |
| CN109856714B (en) * | 2018-10-23 | 2021-06-04 | 友达光电股份有限公司 | Light leakage prevention film assembly and display using same |
| CN111965737A (en) * | 2020-02-20 | 2020-11-20 | 友达光电股份有限公司 | Optical film and display device |
| TWI718007B (en) * | 2020-02-20 | 2021-02-01 | 友達光電股份有限公司 | Optical film and display |
| CN111965737B (en) * | 2020-02-20 | 2022-03-01 | 友达光电股份有限公司 | Optical film and display device |
| CN114077000A (en) * | 2020-08-13 | 2022-02-22 | 苏州维旺科技有限公司 | Diffusion sheet, preparation method thereof and backlight module |
| CN115712213A (en) * | 2022-10-18 | 2023-02-24 | 武汉华星光电技术有限公司 | Optical diaphragm and backlight module |
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