CN102109144A - Lower diffusion sheet in backlight module and manufacturing method thereof - Google Patents
Lower diffusion sheet in backlight module and manufacturing method thereof Download PDFInfo
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- CN102109144A CN102109144A CN 200910214070 CN200910214070A CN102109144A CN 102109144 A CN102109144 A CN 102109144A CN 200910214070 CN200910214070 CN 200910214070 CN 200910214070 A CN200910214070 A CN 200910214070A CN 102109144 A CN102109144 A CN 102109144A
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Abstract
The invention discloses a lower diffusion sheet in a backlight module and a manufacturing method thereof. In the method, a front coating paint and a rear coating paint which are proportioned are respectively coated at the front and rear of an optical diaphragm; and then coatings are solidified, thus obtaining the lower diffusion sheet. In the invention, the surface of the lower diffusion sheet manufactured by adopting the technical scheme is coarser because a light diffusant with different-dimension grains are adopted for the front coating of the lower dffusion sheet so as to be beneficial to the diffusion of a light box, thereby forming an uniform light source; and a light diffusant with small grains is adopted for the rear coating, so that the surface of the lower diffusion sheet is smoother. The lower diffusion sheet disclosed by the invention can be used for an LCD (Light Crystal Display) product of a larger dimension, has the advantages of high light transmittance, high haze and capability of effectively enhancing the properties of the backlight module.
Description
Technical field:
The present invention relates to module product technical field backlight, refer in particular to following diffusion sheet and preparation method thereof in a kind of module backlight.
Background technology:
So-called backlight (BackLight) is to be positioned at LCD (LCD) a kind of light source behind, and its illumination effect will directly have influence on the LCD MODULE visual effect.In the design of backlight, selecting for use of used light source is very important.Many at present employings module backlight is as backlight.See Fig. 1, this is a kind of structural representation as module backlight, and it comprises: LGP 1, be positioned at following diffusion sheet, prismatic lens and last diffusion sheet that LGP 1 top covers successively.Light source printing opacity LGP 1 changes upwards projection, and successively through diffusion sheet, prismatic lens and last diffusion sheet down.The performance of module backlight directly has direct relation with following diffusion sheet, particularly as in large-sized LCD product, the light transmission of following diffusion sheet directly influences the performance of module backlight, and the technical scheme that the inventor proposed is also made at following diffusion sheet just.
Summary of the invention:
Technical problem to be solved by this invention is exactly that diffusion sheet and preparation method thereof down is provided to provide in a kind of module backlight that improves light transmittance.
For solving the problems of the technologies described above, descend diffusion sheet to adopt following technical scheme among the present invention in the module backlight: this time diffusion sheet comprises optical thin film and the face-coating and the back coating that are coated on the optical thin film, raw material in the described face-coating comprises: acrylic resin, light diffusing agent, curing agent and viscosity auxiliary agent, wherein the weight ratio of various raw materials is: acrylic resin: light diffusing agent: curing agent: viscosity auxiliary agent :=6～7: 6～7: 0.2～0.8: 0.02～0.08, wherein light diffusing agent comprises the raw material that two kinds of different product particle diameters vary in size, and wherein the weight ratio of macroparticle light diffusing agent and small-particle light diffusing agent is: 5～6: 0.6～1.2; Raw material in the described back coating comprises: mylar, amino resins, light diffusing agent and curing agent, wherein the weight ratio of various raw materials is: mylar: amino resins: light diffusing agent: curing agent=6～7: 0.2～0.5: 0.02～0.08: 0.1～0.3.
Described optical thin film is PET, i.e. PETG.
Curing agent in described front and the back coating is an isocyanates.
Light diffusing agent in the described CB coating adopts the small-particle light diffusing agent in the face-coating.
Descend the technical scheme that preparation method adopted of diffusion sheet to be among the present invention in the module backlight: this method may further comprise the steps: the first step: allotment face-coating coating: acrylic resin, light diffusing agent are mixed, and stir, add curing agent then, stir, add the viscosity auxiliary agent at last and stir and get final product; Second step: allotment back coating coating: mylar, amino resins, light diffusing agent are mixed, and stir, add curing agent then, stirring once more gets final product; The 3rd step: deployed face-coating coating and back coating coating are coated in the optical thin film front and back respectively, and coating is promptly finished after solidifying, and wherein be the hardening time of face-coating coating: at least 24 hours, solidification temperature was: 20-80 degree centigrade; Be the hardening time of back coating coating: at least 24 hours, solidification temperature was: 20-80 degree centigrade.
In the above-mentioned preparation method, the weight ratio of various raw materials is in the described face-coating: acrylic resin: light diffusing agent: curing agent: viscosity auxiliary agent :=6～7: 6～7: 0.2～0.8: 0.02～0.08, wherein light diffusing agent comprises the raw material that two kinds of different product particle diameters vary in size, and wherein the weight ratio of macroparticle light diffusing agent and small-particle light diffusing agent is: 5～6: 0.6～1.2; The weight ratio of various raw materials is in the described back coating: mylar: amino resins: light diffusing agent: curing agent=6～7: 0.2～0.5: 0.02～0.08: 0.1～0.3.
In the above-mentioned preparation method, optical thin film is PET.
In the above-mentioned preparation method, in the face-coating in the light diffusing agent particle diameter of macroparticle diffusant be the 15-25 micron, the particle diameter of small-particle diffusant is the 8-12 micron.
In the above-mentioned preparation method, the curing agent in front and the back coating is an isocyanates.
Employed solvent is toluene, cyclohexanone in the described face-coating, perhaps its mixture; Employed solvent is toluene, butanone in the described back coating, perhaps its mixture.
The present invention adopts the following diffusion sheet of technique scheme made, and its face-coating is owing to adopt the different light diffusing agent of particle size, and its surface is comparatively coarse, help the diffusion of light, form uniform light source, and back coating adopts the small-particle light diffusing agent, comparatively level and smooth.The present invention can be used in the larger-size LCD product, and it has high transmission rate, and high mist degree can effectively promote the performance of module backlight.
Description of drawings:
Fig. 1 is the structural representation of existing module backlight;
Fig. 2 is a microstructure schematic diagram of the present invention.
The specific embodiment:
The present invention is further illustrated below in conjunction with specific embodiment.
Make when of the present invention, need allotment face-coating coating and back coating coating, at first, the method of allotment face-coating coating is: acrylic resin, light diffusing agent are put into solvent mix, and stir, approximately stirred about 40-50 minute with 600rpm speed, add curing agent, carry out stir about once more, approximately add the viscosity auxiliary agent after 40-50 minute and stir, got final product in 50-60 minute with the stirring of 600rpm speed again with the stirring of 600rpm speed.
The solvent that face-coating adopted in the present embodiment is: the mixture of toluene and cyclohexanone also can be to use wherein a kind of solvent separately.The weight ratio of various raw materials is in the face-coating: acrylic resin: light diffusing agent: curing agent: viscosity auxiliary agent :=6～7: 6～7: 0.2～0.8: 0.02～0.08, wherein light diffusing agent comprises the raw material that two kinds of different product particle diameters vary in size, and wherein the weight ratio of macroparticle light diffusing agent and small-particle light diffusing agent is: 5～6: 0.6～1.2.The weight proportion that is adopted in the present embodiment is: acrylic resin: 6.5
Macroparticle light diffusing agent: 5.5
Small-particle light diffusing agent: 1.0
Curing agent: 0.5
Viscosity auxiliary agent: 0.05
It is the product of A-811 that above-mentioned acrylic resin can adopt model, it is as the basis of face-coating, be extensive use of with the basis of acrylic resin in the field of module backlight as face-coating, it has gloss, hardness preferably, and solvent resistance, weather resisteant, performance such as not flavescence is all comparatively excellent when high-temperature baking.
Main body among the present invention is a resin, so make its effect that forms printing opacity, even light if desired, must add light diffusing agent usually.Usually, the optical index of light diffusing agent will liken the refractive index height into matrix resin to.In addition, the particle diameter of light diffusing agent is greater than visible wavelength.(0.4～0.75um) is big, can effectively cover light source so be dispersed in the light diffusing agent of the capacity in the resin, and the distance between adjacent two light diffusion particles is very little because the particle diameter of light diffusing agent is than wavelength of visible light.Therefore, produce repeatedly scattering, make dazzling incident light become the even sheen of affine human eye.
The light diffusing agent that why adopts two kinds of particle diameters not wait in the present embodiment, it is just in order to form better illumination effect.See Fig. 2, in the present embodiment, face-coating 2 forms uniform luminous effect because the inside has two kinds of light diffusing agents that particle diameter is not of uniform size, and its coating surface is " coarse " comparatively, so just is beneficial to the diffusion of light.
It is the light diffusing agent of MB10X-20 that above-mentioned macroparticle light diffusing agent can adopt model, and its particle diameter is greatly about 20um, and it is the light diffusing agent of MS10X-8D that the small-particle light diffusing agent can adopt model, and its particle diameter is about about 8um.
Light diffusing agent can adopt organic diffusant or inorganic diffusant, and what adopt in the present embodiment is organic diffusant, except that the above-mentioned model that adopts, also can adopt the light diffusing agent of many combinations of acrylic compounds, olefines, acrylic acid-olefines or multilayer.
It is the isocyanates of DN-980S that above-mentioned curing agent adopts model, and it mainly is cured resin in the whole coating exactly.
It is the silane coupler of A-187 that the viscosity auxiliary agent can adopt model, and it can improve the bonding force of acrylic resin in the face-coating, strengthens the steadiness of coating.It can improve adhesive strength, water proofing property, wearability, scrub resistance, scratch resistance and the chemical-resistant of coating as adhesion promoters.
Secondly, the method of allotment back coating coating is: mylar, amino resins, light diffusing agent are joined in the solvent mix, and stir, approximately stirred about 40-50 minute with 600rpm speed, add curing agent, carry out stir about once more, got final product in 50-60 minute with the stirring of 600rpm speed.
The solvent that back coating adopted in the present embodiment is: the mixture of toluene and butanone also can be to use wherein a kind of solvent separately.In the present embodiment in the back coating weight ratio of various raw materials be: mylar: amino resins: light diffusing agent: curing agent=6～7: 0.2～0.5: 0.02～0.08: 0.1～0.3.The weight proportion that is adopted in the present embodiment is:
Mylar: 6.5
Amino resins: 0.3
Light diffusing agent: 0.05
Curing agent: 0.2
Above-mentioned mylar is a kind of solvent type resin, and it forms the main body of back coating with amino resins.Can to adopt model be the mylar of ES-100 to mylar in the present embodiment, and amino resins can adopt the product of the CYMEL380 model of the special company of U.S.'s cyanogen.
Employed light diffusing agent can adopt employed small-particle light diffusing agent in the above-mentioned face-coating in this back coating, and promptly adopting model is the light diffusing agent of MS10X-8D.Isocyanates as for curing agent employing PU-101 is cured resin in the whole coating.
This back coating is because light diffusing agent adopts the small-particle diffusant, and it can not form the same with above-mentioned face-coating " coarse " surface, and it is smooth relatively, its in module backlight as antistatic coating.
At last, deployed face-coating coating and back coating coating are coated in the optical thin film front and back respectively, coating is promptly finished after solidifying, wherein be the hardening time of face-coating coating: at least 24 hours, solidification temperature is: 20-80 degree centigrade, present embodiment can be chosen under 60 degrees celsius and solidify two days, then in the coated back surface coating.Be the hardening time of back coating coating: at least 24 hours, solidification temperature was: 20-80 degree centigrade, present embodiment can be chosen under 60 degrees celsius and solidify two days.
Optical thin film adopts PET (PETG) in the present embodiment.
After present embodiment completes, its microstructure as shown in Figure 2, in the present embodiment, face-coating 2 is because the inside has two kinds of light diffusing agents that particle diameter is not of uniform size---macroparticle light diffusing agent 3 and small-particle light diffusing agent 4, so face-coating 2 surfaces are " coarse " comparatively, so just be beneficial to the diffusion of light, form uniform luminous effect.Back coating 5 is owing to only have small-particle light diffusing agent 4, so its surface comparatively " smoothly ", face-coating 2 and back coating 5 evenly are coated in the positive and negative surface of optical thin film.
Adopt said method that the following diffusion sheet of making is detected, its testing result is as follows:
F represents the thickness of face-coating, and B represents the thickness of back coating.
Certainly, the above only is example of the present invention, is not to limit the scope of the present invention, so all equivalences of doing according to the described structure of the present patent application claim, feature and principle change or modify, and all should be included in the present patent application claim.
Claims (10)
1. descend diffusion sheet in a module backlight, comprising: optical thin film and the face-coating and the back coating that are coated on the optical thin film is characterized in that:
Raw material in the described face-coating comprises: acrylic resin, light diffusing agent, curing agent and viscosity auxiliary agent, wherein the weight ratio of various raw materials is: acrylic resin: light diffusing agent: curing agent: viscosity auxiliary agent :=6～7: 6～7: 0.2～0.8: 0.02～0.08, wherein light diffusing agent comprises the raw material that two kinds of different product particle diameters vary in size, and wherein the weight ratio of macroparticle light diffusing agent and small-particle light diffusing agent is: 5～6: 0.6～1.2;
Raw material in the described back coating comprises: mylar, amino resins, light diffusing agent and curing agent, wherein the weight ratio of various raw materials is: mylar: amino resins: light diffusing agent: curing agent=6～7: 0.2～0.5: 0.02～0.08: 0.1～0.3.
2. diffusion sheet under in a kind of module backlight according to claim 1, it is characterized in that: described optical thin film is PET.
3. diffusion sheet under in a kind of module backlight according to claim 1, it is characterized in that: the curing agent in described front and the back coating is an isocyanates.
4. diffusion sheet under in a kind of module backlight according to claim 1 is characterized in that: the light diffusing agent in the described CB coating adopts the small-particle light diffusing agent in the face-coating.
5. the preparation method of diffusion sheet down in the module backlight, it is characterized in that: this method may further comprise the steps:
The first step: allotment face-coating coating: acrylic resin, light diffusing agent are put into solvent mix, and stir, add curing agent then, stir, add the viscosity auxiliary agent at last and stir and get final product;
Second step: allotment back coating coating: mylar, amino resins, light diffusing agent are mixed, and stir, add curing agent then, stirring once more gets final product;
The 3rd step: deployed face-coating coating and back coating coating are coated in the optical thin film front and back respectively, and coating is promptly finished after solidifying, and wherein be the hardening time of face-coating coating: at least 24 hours, solidification temperature was: 20-80 degree centigrade; Be the hardening time of back coating coating: at least 24 hours, solidification temperature was: 20-80 degree centigrade.
6. the preparation method of diffusion sheet under in a kind of module backlight according to claim 5, it is characterized in that: the weight ratio of various raw materials is in the described face-coating: acrylic resin: light diffusing agent: curing agent: viscosity auxiliary agent :=6～7: 6～7: 0.2～0.8: 0.02～0.08, wherein light diffusing agent comprises the raw material that two kinds of different product particle diameters vary in size, and wherein the weight ratio of macroparticle light diffusing agent and small-particle light diffusing agent is: 5～6: 0.6～1.2;
The weight ratio of various raw materials is in the described back coating: mylar: amino resins: light diffusing agent: curing agent=6～7: 0.2～0.5: 0.02～0.08: 0.1～0.3.
7. the preparation method of diffusion sheet under in a kind of module backlight according to claim 6, it is characterized in that: described optical thin film is PET.
8. the preparation method of diffusion sheet under in a kind of module backlight according to claim 7, it is characterized in that: in the described face-coating in the light diffusing agent particle diameter of macroparticle diffusant be the 15-25 micron, the particle diameter of small-particle diffusant is the 8-12 micron.
9. according to the preparation method of following diffusion sheet in any described a kind of module backlight among the claim 6-8, it is characterized in that: the curing agent in described front and the back coating is an isocyanates.
10. the preparation method of diffusion sheet under in a kind of module backlight according to claim 9, it is characterized in that: employed solvent is toluene, cyclohexanone in the described face-coating, perhaps its mixture; Employed solvent is toluene, butanone in the described back coating, perhaps its mixture.
Priority Applications (1)
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| CN 200910214070 CN102109144B (en) | 2009-12-23 | 2009-12-23 | Lower diffusion sheet in backlight module and manufacturing method thereof |
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| CN 200910214070 CN102109144B (en) | 2009-12-23 | 2009-12-23 | Lower diffusion sheet in backlight module and manufacturing method thereof |
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| CN102109144B CN102109144B (en) | 2013-06-19 |
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Cited By (8)
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| CN102540291A (en) * | 2012-02-08 | 2012-07-04 | 宁波长阳科技有限公司 | Optical diffusion film and preparation method thereof |
| WO2013059979A1 (en) * | 2011-10-24 | 2013-05-02 | Huawei Technologies Co., Ltd. | Method and network entity for managing communications according to a first radio access technology and according to a second radio access technology |
| CN104136970A (en) * | 2012-01-31 | 2014-11-05 | 3M创新有限公司 | Display with nonwoven diffuser |
| CN104748007A (en) * | 2015-02-14 | 2015-07-01 | 溧阳市超强链条制造有限公司 | LED light box and production method |
| CN107656328A (en) * | 2017-11-07 | 2018-02-02 | 张永宏 | Suitable for the brightening piece of television backlight |
| CN107828072A (en) * | 2017-11-07 | 2018-03-23 | 张永宏 | Diffusion sheet |
| CN110862757A (en) * | 2019-12-06 | 2020-03-06 | 深圳职业技术学院 | Light diffusion coating, light diffusion sheet, preparation method of light diffusion sheet and backlight module |
| CN114384725A (en) * | 2021-12-30 | 2022-04-22 | 南京贝迪新材料科技股份有限公司 | Quantum dot composite film and preparation method thereof |
Family Cites Families (3)
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| CN100416305C (en) * | 2006-06-16 | 2008-09-03 | 长兴化学工业股份有限公司 | Optical thin sheet |
| CN100468088C (en) * | 2007-06-25 | 2009-03-11 | 长兴光学材料（苏州）有限公司 | Optical thin film of organic particle with narrow particle size distribution |
| CN100492060C (en) * | 2007-07-23 | 2009-05-27 | 长兴光学材料（苏州）有限公司 | Optical thin film with resin coating containing narrow particle size distributed organic particle |
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2009
- 2009-12-23 CN CN 200910214070 patent/CN102109144B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013059979A1 (en) * | 2011-10-24 | 2013-05-02 | Huawei Technologies Co., Ltd. | Method and network entity for managing communications according to a first radio access technology and according to a second radio access technology |
| CN104136970A (en) * | 2012-01-31 | 2014-11-05 | 3M创新有限公司 | Display with nonwoven diffuser |
| CN102540291A (en) * | 2012-02-08 | 2012-07-04 | 宁波长阳科技有限公司 | Optical diffusion film and preparation method thereof |
| CN104748007A (en) * | 2015-02-14 | 2015-07-01 | 溧阳市超强链条制造有限公司 | LED light box and production method |
| CN107656328A (en) * | 2017-11-07 | 2018-02-02 | 张永宏 | Suitable for the brightening piece of television backlight |
| CN107828072A (en) * | 2017-11-07 | 2018-03-23 | 张永宏 | Diffusion sheet |
| CN110862757A (en) * | 2019-12-06 | 2020-03-06 | 深圳职业技术学院 | Light diffusion coating, light diffusion sheet, preparation method of light diffusion sheet and backlight module |
| CN110862757B (en) * | 2019-12-06 | 2021-07-06 | 深圳职业技术学院 | Light diffusion coating, light diffusion sheet, preparation method of light diffusion sheet and backlight module |
| CN114384725A (en) * | 2021-12-30 | 2022-04-22 | 南京贝迪新材料科技股份有限公司 | Quantum dot composite film and preparation method thereof |
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