CN101979914A - Optical diffusion film and backlight module using same - Google Patents
Optical diffusion film and backlight module using same Download PDFInfo
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- CN101979914A CN101979914A CN 201010289044 CN201010289044A CN101979914A CN 101979914 A CN101979914 A CN 101979914A CN 201010289044 CN201010289044 CN 201010289044 CN 201010289044 A CN201010289044 A CN 201010289044A CN 101979914 A CN101979914 A CN 101979914A
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Abstract
The invention discloses an optical diffusion film. An optical diffusion layer is coated on one surface of a transparent base film, optical diffusion particles are uniformly distributed in the optical diffusion layer, the optical diffusion particles are transparent polymer spherical particles with diameters of 5 to 50 microns, and the particle diameter distribution of the transparent polymer spherical particles is monodisperse; and the optical diffusion film can effectively improve the optical uniformity. The invention also discloses a backlight module using the optical diffusion film. The backlight module can avoid using a high-cost prism sheet or a brightness enhancement film assembly, and can greatly improve the brightness of a liquid crystal display and save the manufacturing cost of the liquid crystal display.
Description
Technical field
The present invention relates to the diffusion barrier field, be specifically related to a kind of optical diffusion membrane and use the backlight module of this optical diffusion membrane, this optical diffusion membrane is the transparent membrane of single face coating light diffusion layer, and it is the backlight module of the liquid crystal indicator of light source that this optical diffusion membrane is specially adapted to the light emitting diode.
Background technology
Plane Display Technique in recent years, particularly the fast development of lcd technology with and in the extensive use of mobile communication equipment demonstration, laptop computer displays, desktop computer display and large scale liquid crystal TV, performance requirement to optical diffusion membrane in the backlight module improves day by day, mainly concentrates on to improve on brightness and the illumination uniformity.
The existing optical diffusion membrane that is applied to backlight module need cooperate prismatic lens or brightness enhancement film to use mostly, otherwise the brightness of the liquid crystal indicator of making is not high.And prismatic lens or Vikuiti are mainly grasped in the hand of fewer companies such as 3M.Therefore, costing an arm and a leg of prismatic lens or brightness enhancement film occupies about 30% of entire backlight source module cost.In addition, the structural representation of existing typical optical diffusion membrane such as Fig. 1, all be coating all to be arranged on the two sides of transparent basement membrane 1, one side is a light diffusion layer 2, another side is an adherent layer 3, transparent basement membrane 1 is generally transparent polyester film, and light diffusion layer 2 includes light diffusion particle 4 and adhesive 5, and adherent layer 3 also comprises polymer particle 6 and adhesive 7.Manufacturing process with optical diffusion membrane of said structure needs twice coating, and the production process complexity causes the defect rate of product higher, and unstable properties.
Typical structure such as Fig. 2 of backlight module show, comprise reflector plate 21, LGP 22, following diffusion sheet 23, prismatic lens 24, go up diffusion sheet 25 and light source 26.The linear light line that light source 26 sends becomes the area source of face homogenising after by LGP 22 and reflector plate 21, the light that sees through LGP 22 passes through diffusion barrier 23, prismatic lens 24 and last diffusion barrier 25 down successively, needs to use the relatively costly prismatic lens of price 24 in this structure.Light source 26 is one of core components of backlight module, and the light source of present most of liquid crystal indicators is cold-cathode fluorescence lamp, external electrode fluorescent lamp or hot-cathode fluorescent lamp, and this type of light source energy consumption is big, and light luminance is much lower than LED source.From the angle of energy-conserving and environment-protective, conventional light source energy consumptions such as cold-cathode fluorescence lamp, external electrode fluorescent lamp or hot-cathode fluorescent lamp are bigger, are unfavorable for environmental protection.
Summary of the invention
The invention provides a kind of optical diffusion membrane that can effectively improve the optics uniformity.
The present invention also provides a kind of backlight module that uses this optical diffusion membrane, can avoid using expensive prismatic lens or brightness enhancement film assembly, the cost of manufacture that can improve the brightness of LCD greatly and save LCD.
A kind of optical diffusion membrane, comprise transparent basement membrane, a surface of described transparent basement membrane is coated with light diffusion layer, even distribute light diffusion particle in the described light diffusion layer, described smooth diffusion particle is that diameter is the transparent polymer spheroidal particle of 5 μ m-50 μ m, and the particle diameter of described transparent polymer spheroidal particle distributes and is single dispersion.Monodispersed polymer spherical particle helps even refraction, the reflection of light on the optical diffusion membrane surface, and then makes the light through optical diffusion membrane have high uniformity.
Described smooth diffusion particle is crosslinked heat curing-type transparent polymer spheroidal particle.
Described crosslinked heat curing-type transparent polymer is selected this area heat curing-type transparent polymer with cross-linked structure commonly used for use, as selecting polystyrene (PS) or polymethyl methacrylate (PMMA) etc. for use.
Described smooth diffusion particle is to be fixed on transparent epilamellarly by macromolecule adhesive, and described macromolecule adhesive is preferably one or more in PEPA, polyurethanes, the amino resins etc.
The curing agent of described macromolecule adhesive is preferably one or more in the isocyanates with two and two above functional groups.
Described transparent basement membrane preferred thickness is the optical grade polymer transparent membrane of 50 μ m-250 μ m, can select in the optical grade polymer transparent membranes such as PETG (PET) film, Merlon (PC) film, polystyrene (PS) film, polymethyl methacrylate (PMMA) film any for use.
The thickness of described light diffusion layer is preferably 5 μ m-50 μ m.Thickness is during less than 5 μ m, and the light diffusion particle on optical diffusion surface easily comes off; Thickness is during greater than 50 μ m, and can energy loss behind the light refraction bigger, the briliancy of display can reduce.
The addition of the light diffusion particle in the described light diffusion layer is preferably the 1%-30% of light diffusion layer gross mass.The addition of light diffusion particle is lower than at 1% o'clock, makes mist degree be lower than expection easily; The addition of light diffusion particle is higher than at 30% o'clock, and excessive diffuse reflection causes energy to lose in a large number, makes display be difficult to obtain desirable briliancy easily.
A kind of backlight module, comprise light source, reflector plate, light diffusing sheet and two optical diffusion membranes, described light source is a light emitting diode, described light source is arranged between described light diffusing sheet and the described reflector plate, described optical diffusion membrane is the optical diffusion membrane of the present invention that two Zhang Pings row is placed, and described optical diffusion membrane has the one side of diffusion layer all away from light diffusing sheet.
Compared with prior art, the present invention has following advantage:
Optical diffusion membrane of the present invention only need once be coated with and dry on manufacture craft, and technology is simple relatively, is suitable for suitability for industrialized production.
Optical diffusion membrane quality stability of the present invention can effectively improve the optics uniformity well.
Backlight module of the present invention can avoid using expensive prismatic lens or brightness enhancement film assembly, the cost of manufacture that can improve the brightness of LCD greatly and save LCD.
Description of drawings
Fig. 1 is the structural representation of existing typical optical diffusion membrane;
Fig. 2 is the structural representation of existing typical backlight module;
Fig. 3 is the structural representation of optical diffusion membrane of the present invention;
Fig. 4 is the organigram of backlight module of the present invention.
The specific embodiment
Embodiment 1:
As shown in Figure 3, optical diffusion membrane of the present invention comprises transparent basement membrane 110 and transparent basement membrane 110 1 lip-deep light diffusion layers 111, and wherein light diffusion layer 111 comprises the particle diameter distribution again and is monodispersed cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113.Transparent basement membrane 110 is 125 microns PET polyester film for thickness; The thickness of light diffusion layer 111 is 25 microns; The average grain diameter of cross-linking type transparent polymer spheroidal particle 112 is 20 microns, and particle diameter distributes 1.01, and cross-linking type transparent polymer spheroidal particle is PMMA, and its addition accounts for 15% of light diffusion layer 111 weight; Macromolecule adhesive be solid content 50% PEPA (magnificent peak group, JF-PE-3030); Curing agent is a toluene di-isocyanate(TDI).
Concrete preparation method is: in dustfree environment more than ten thousand grades, stir after cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 mixed by 15: 35 part by weight, adding toluene di-isocyanate(TDI) again mixes and obtains glue, the addition of toluene di-isocyanate(TDI) is 0.35% of cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 gross masses, adopt the method for scraper coating or airblade coating that above-mentioned glue application is arrived transparent basement membrane 110 surfaces, after being heating and curing, obtain optical diffusion membrane.
Embodiment 2:
As shown in Figure 3, optical diffusion membrane of the present invention comprises transparent basement membrane 110 and transparent basement membrane 110 1 lip-deep light diffusion layers 111, and wherein light diffusion layer 111 comprises the particle diameter distribution again and is monodispersed cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113.Basement membrane 110 is 250 microns PET polyester film for thickness; The thickness of light diffusion layer 111 is 30 microns; The average grain diameter of cross-linking type transparent polymer spheroidal particle 112 is 5 microns, and particle diameter distributes 1.05, and cross-linking type transparent polymer spheroidal particle is PMMA, and its addition accounts for 18% of diffusion layer weight; Macromolecule adhesive be solid content 50% PEPA (magnificent peak group, JF-PE-3030); Curing agent is a methyl diphenylene diisocyanate.
Concrete preparation method is: in dustfree environment more than ten thousand grades, stir after cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 mixed by 18: 32 part by weight, adding methyl diphenylene diisocyanate again mixes and obtains glue, the addition of methyl diphenylene diisocyanate is 0.32% of cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 gross masses, adopt the method for scraper coating or airblade coating that above-mentioned glue application is arrived transparent basement membrane 110 surfaces, after being heating and curing, obtain optical diffusion membrane.
Embodiment 3:
As shown in Figure 3, optical diffusion membrane of the present invention comprises transparent basement membrane 110 and transparent basement membrane 110 1 lip-deep light diffusion layers 111, and wherein light diffusion layer 111 comprises the particle diameter distribution again and is monodispersed cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113.Basement membrane 110 is 125 microns PC film for thickness; The thickness of light diffusion layer 111 is 25 microns; The average grain diameter of cross-linking type transparent polymer spheroidal particle 112 is 20 microns, and particle diameter distributes 1.03, and cross-linking type transparent polymer spheroidal particle is PMMA, and its addition accounts for 10% of diffusion layer weight; Macromolecule adhesive be solid content 40% polyurethane resin (magnificent peak group, JF-A-5030); Curing agent is a polyphenyl polymethylene polyisocyanates.
Concrete preparation method is: in dustfree environment more than ten thousand grades, stir after cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 mixed by 10: 40 part by weight, adding polyphenyl polymethylene polyisocyanates again mixes and obtains glue, the addition of polyphenyl polymethylene polyisocyanates is 0.20% of cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 gross masses, adopt the method for scraper coating or airblade coating that above-mentioned glue application is arrived transparent basement membrane 110 surfaces, after being heating and curing, obtain optical diffusion membrane.
Embodiment 4:
As shown in Figure 3, optical diffusion membrane of the present invention comprises transparent basement membrane 110 and transparent basement membrane 110 1 lip-deep light diffusion layers 111, and wherein light diffusion layer 111 comprises the particle diameter distribution again and is monodispersed cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113.Basement membrane 110 is 155 microns PMMA film for thickness; The thickness of light diffusion layer 111 is 20 microns; The average grain diameter of cross-linking type transparent polymer spheroidal particle 112 is 15 microns, and particle diameter distributes 1.04, and cross-linking type transparent polymer spheroidal particle is PS, and its addition accounts for 12% of diffusion layer weight; Macromolecule adhesive be solid content 40% polyurethane resin (magnificent peak group, JF-A-5030); Curing agent is a toluene di-isocyanate(TDI).
Concrete preparation method is: in dustfree environment more than ten thousand grades, stir after cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 mixed by 12: 38 part by weight, adding toluene di-isocyanate(TDI) again mixes and obtains glue, the addition of toluene di-isocyanate(TDI) is 0.38% of cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 gross masses, adopt the method for scraper coating or airblade coating that above-mentioned glue application is arrived transparent basement membrane 110 surfaces, after being heating and curing, obtain optical diffusion membrane.
Embodiment 5:
As shown in Figure 3, optical diffusion membrane of the present invention comprises transparent basement membrane 110 and transparent basement membrane 110 1 lip-deep light diffusion layers 111, and wherein light diffusion layer 111 comprises the particle diameter distribution again and is monodispersed cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113.Basement membrane 110 is 100 microns PS film for thickness; The thickness of light diffusion layer 111 is 20 microns; The average grain diameter of cross-linking type transparent polymer spheroidal particle 112 is 50 microns, and particle diameter distributes 1.02, and cross-linking type transparent polymer spheroidal particle is PMMA, and its addition accounts for 12% of diffusion layer weight; Macromolecule adhesive is the amino resins (Cytec, CYMEL 325) of solid content 80%; Curing agent is a methyl diphenylene diisocyanate.
Concrete preparation method is: in dustfree environment more than ten thousand grades, stir after cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 mixed by 12: 38 part by weight, adding methyl diphenylene diisocyanate again mixes and obtains glue, the addition of methyl diphenylene diisocyanate is 0.38% of cross-linking type transparent polymer spheroidal particle 112 and macromolecule adhesive 113 gross masses, adopt the method for scraper coating or airblade coating that above-mentioned glue application is arrived transparent basement membrane 110 surfaces, after being heating and curing, obtain optical diffusion membrane.
Embodiment 6:
As shown in Figure 4, backlight module of the present invention comprises reflector plate 201, light source 202, light diffusing sheet 203 and two identical optical diffusion membranes 204, and wherein, light source 202 is a light emitting diode, and optical diffusion membrane 204 is the optical diffusion membrane of embodiment 1 preparation; Light source 202 is arranged between light diffusing sheet 203 and the reflector plate 201, two optical diffusion membrane 204 parallel being placed on the light diffusing sheet 203, and also two optical diffusion membranes 204 have the one side of diffusion layer all away from light diffusing sheet 203.
Embodiment 7:
As shown in Figure 4, except optical diffusion membrane 204 was the optical diffusion membrane of embodiment 2 preparations, all the other made backlight module with embodiment 6.
Embodiment 8:
As shown in Figure 4, except optical diffusion membrane 204 was the optical diffusion membrane of embodiment 3 preparations, all the other made backlight module with embodiment 6.
Embodiment 9:
As shown in Figure 4, except optical diffusion membrane 204 was the optical diffusion membrane of embodiment 4 preparations, all the other made backlight module with embodiment 6.
Embodiment 10:
As shown in Figure 4, except optical diffusion membrane 204 was the optical diffusion membrane of embodiment 5 preparations, all the other made backlight module with embodiment 6.
Comparative Examples 1:
As shown in Figure 1, in dustfree environment more than ten thousand grades, the PEPA that particle diameter is distributed as 2.05 PMMA spheroidal particle (average diameter is 20 μ m) and solid content 50% stirs after mixing by 15: 35 part by weight, and the methyl diphenylene diisocyanate that adds PMMA spheroidal particle and PEPA gross mass 0.35% again mixes and obtains glue.Adopting the method for scraper coating or airblade coating is surface of PET film of 125 μ m with above-mentioned glue application to thickness, through being heating and curing; The PEPA that again particle diameter is distributed as 1.05 PMMA spheroidal particle (average diameter is 10 μ m) and solid content 50% stirs after mixing by 10: 40 part by weight, the methyl diphenylene diisocyanate that adds PMMA spheroidal particle and PEPA gross mass 0.40% again mixes and obtains glue, the method that adopts scraper coating or airblade coating obtains optical diffusion membrane with above-mentioned glue application another surface to the PET film after being heating and curing.
Comparative Examples 2:
With the optical diffusion in the comparative example 1 is one of assembly, and light source adopts cathode fluorescent tube, and brightness enhancement film adopts the vikuiti BEF of 3M company, by structure fabrication backlight module shown in Figure 2.
Test result analysis:
Analyze the optical diffusion membrane of making in embodiment 1～5 and the comparative example 1, measure its mist degree, the results are shown in the Table A.In addition, also analyzed the backlight module in embodiment 6～10 and the comparative example 2, measured its brightness, the result also lists in the Table A.Improve a lot by Table A optical diffusion of the present invention as can be seen more traditional preparation method on mist degree, the backlight module of making of optical diffusion of the present invention also has tangible brightness advantage.
Table A
Claims (10)
1. optical diffusion membrane, comprise transparent basement membrane, it is characterized in that, a surface of described transparent basement membrane is coated with light diffusion layer, even distribute light diffusion particle in the described light diffusion layer, described smooth diffusion particle is that diameter is the transparent polymer spheroidal particle of 5 μ m-50 μ m, and the particle diameter of described transparent polymer spheroidal particle distributes and is single dispersion.
2. optical diffusion membrane according to claim 1 is characterized in that, described smooth diffusion particle is crosslinked heat curing-type transparent polymer spheroidal particle.
3. optical diffusion membrane according to claim 2 is characterized in that, described crosslinked heat curing-type transparent polymer is polystyrene or polymethyl methacrylate.
4. optical diffusion membrane according to claim 1, it is characterized in that, described smooth diffusion particle is to be fixed on transparent epilamellarly by macromolecule adhesive, and described macromolecule adhesive is one or more in PEPA, polyurethane, the amino resins.
5. optical diffusion membrane according to claim 4 is characterized in that, the curing agent of described macromolecule adhesive is to have in the isocyanates of two or more functional groups one or more.
6. optical diffusion membrane according to claim 1 is characterized in that, described transparent basement membrane is the optical grade polymer transparent membrane of thickness 50 μ m-250 μ m.
7. optical diffusion membrane according to claim 6 is characterized in that, described optical grade polymer transparent membrane is any in pet film, polycarbonate film, polystyrene film, the polymethyl methacrylate film.
8. optical diffusion membrane according to claim 1 is characterized in that, the thickness of described light diffusion layer is 5 μ m-50 μ m.
9. optical diffusion membrane according to claim 1 is characterized in that, the addition of the light diffusion particle in the described light diffusion layer is the 1%-30% of light diffusion layer gross mass.
10. backlight module that contains each described optical diffusion membrane of claim 1-9, comprise light source, reflector plate, light diffusing sheet and two optical diffusion membranes, it is characterized in that, described light source is a light emitting diode, described light source is arranged between described light diffusing sheet and the described reflector plate, described two parallel placements of optical diffusion membrane, and described optical diffusion membrane has the one side of diffusion layer all away from light diffusing sheet.
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| CN103982827A (en) * | 2014-05-29 | 2014-08-13 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN106842392A (en) * | 2015-12-04 | 2017-06-13 | 奇美实业股份有限公司 | Building material plate, manufacturing method and application thereof |
| CN107833877A (en) * | 2017-11-28 | 2018-03-23 | 西安科锐盛创新科技有限公司 | LED encapsulation structure |
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| CN103982827A (en) * | 2014-05-29 | 2014-08-13 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN106842392A (en) * | 2015-12-04 | 2017-06-13 | 奇美实业股份有限公司 | Building material plate, manufacturing method and application thereof |
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| CN109713109A (en) * | 2017-10-25 | 2019-05-03 | Tcl集团股份有限公司 | A kind of film and the preparation method and application thereof |
| CN109713109B (en) * | 2017-10-25 | 2021-07-16 | Tcl科技集团股份有限公司 | Film and preparation method and application thereof |
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| CN107946447A (en) * | 2017-11-28 | 2018-04-20 | 西安科锐盛创新科技有限公司 | A kind of encapsulating structure of LED |
| CN107946438A (en) * | 2017-11-28 | 2018-04-20 | 西安科锐盛创新科技有限公司 | A kind of great power LED bilayer hemisphere encapsulating structure |
| CN107968136A (en) * | 2017-11-28 | 2018-04-27 | 西安科锐盛创新科技有限公司 | LED encapsulation method and structure |
| CN107946440A (en) * | 2017-11-28 | 2018-04-20 | 西安科锐盛创新科技有限公司 | A kind of great power LED bilayer encapsulating structure |
| CN107946439A (en) * | 2017-11-28 | 2018-04-20 | 西安科锐盛创新科技有限公司 | A kind of LED encapsulation structure |
| CN107833877A (en) * | 2017-11-28 | 2018-03-23 | 西安科锐盛创新科技有限公司 | LED encapsulation structure |
| JP2019211576A (en) * | 2018-06-01 | 2019-12-12 | 株式会社ダイセル | Newton ring prevention film, and manufacturing method and application of the same |
| JP7296196B2 (en) | 2018-06-01 | 2023-06-22 | 株式会社ダイセル | Anti-Newton ring film and its manufacturing method and use |
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Application publication date: 20110223 |