CN103412355A - Diffusion membrane capable of improving viewing angle - Google Patents
Diffusion membrane capable of improving viewing angle Download PDFInfo
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- CN103412355A CN103412355A CN2013103623423A CN201310362342A CN103412355A CN 103412355 A CN103412355 A CN 103412355A CN 2013103623423 A CN2013103623423 A CN 2013103623423A CN 201310362342 A CN201310362342 A CN 201310362342A CN 103412355 A CN103412355 A CN 103412355A
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Abstract
The invention relates to the technical field of optical thin film, in particular to a diffusion membrane capable of enlarging the viewing angle. The diffusion membrane is used for further enlarging the viewing angle of a backlight module. The diffusion membrane comprises a transparent base material, a diffusion coating and a protection coating, wherein the diffusion coating and the protection coating are arranged on the two sides of the transparent base material respectively, the diffusion coating comprises, by weight, 100 parts of adhesives and 75-120 parts of diffusion particles, the diffusion particles are adhered to the upper surface of the transparent base material through the adhesives, the particle diameters of the diffusion particles are the same, or the particle diameter variable coefficient of the diffusion particles is smaller than or equal to 15%, and the particle diameters of the diffusion particles are 8-35 microns. The diffusion membrane has the function of improving luminance and the function of enabling light to be even, and can effectively enlarge the viewing angle of the backlight module, and thus the viewing angle of a liquid crystal displayer is enlarge, and the watching effect of the liquid crystal displayer can be better.
Description
Technical field
The present invention relates to optical film technology field, relate in particular to a kind of diffusion barrier sheet that improves visible angle.
Background technology
The demand multiplication of recent year market to LCD TV and display, LCD TV and display manufacturing manufacturer dog-eat-dog, also promoted simultaneously the improvement of LCD TV and display performance, and visible angle is the particularly difficult problem of large scale liquid crystal TV manufacturer of puzzlement liquid crystal display always.
The visible angle of liquid crystal display refers to that the user can know the angular range of seeing LCD picture.Different near the visible angle of 180 ° for the CRT monitor from before, the visible angle of most liquid crystal display is much smaller.Because the light that backlight sends, after bias pole piece, liquid crystal and oriented layer, has directivity, most light is the concentration indicator front all.Therefore the optimal viewing angle of liquid crystal display is all little, and after surpassing optimal viewing angle, the brightness of picture, contrast and color effect just sharply descend, and cause watching.
Backlight module is as the light supplier of liquid crystal display, visible angle on liquid crystal display has great impact, when departing from the backlight module front, light obviously reduces, as shown in Figure 2, front face brightness (0 ° time) is the highest, and brightness is along with the change of display deviation angle is large, and obviously reduce, this has also just caused the angle of visibility of liquid crystal display narrower.Brightness when we need to improve backlight module and depart from front, make it within the specific limits, and brightness is better, thereby improve the visible angle of liquid crystal display.And generally by the TCO value, mean in the industry the visible angle of backlight module, and TCO value is in current display industry, to generally acknowledge that the most current safety standard one of authenticates, and more common is TCO3.0 and TCO6.0 version, and these two editions all to visible angle requirement to some extent.And the TCO value is exactly in the industry to a specifications of surveys of angle of visibility, the TCO value is more low better, when the TCO value is 1, means that the brightness of all angles is all homogeneous, and this is a perfect condition, and generally the TCO value of existing backlight module is 1.75-1.85.
Summary of the invention
In order further to improve the visible angle of backlight module, the invention provides a kind of diffusion barrier sheet, described diffusion barrier sheet not only has the effect that improves brightness, uniform light, can effectively improve simultaneously the visible angle of backlight module, thereby improve the visible angle of liquid crystal display, make the viewing effect of display better.
In order to solve the problems of the technologies described above, the present invention adopts following technical proposals:
The invention provides a kind of diffusion barrier sheet that improves visible angle, it is characterized in that, described diffusion barrier sheet comprises transparent base (abbreviation base material), diffusion coating (abbreviation diffusion layer) and protective finish; Described diffusion coating and protective finish lay respectively at the both sides of described transparent base, and described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 75-120 weight portion; Described diffusion particle coheres the upper surface at described transparent base by adhesive, and the identical or particle diameter coefficient of variation of the particle diameter of described diffusion particle is less than or equal to 15%, and described particle diameter is 8-35 μ m.Within the specific limits, described diffusion particle particle diameter is larger, the coefficient of variation is less, and the visible angle of diffusion barrier sheet is higher; The diffusion particle particle diameter of diffusion barrier sheet identical (the particle diameter coefficient of variation goes to zero), the visible angle of diffusion barrier sheet is higher; In addition, the ratio of diffusion particle and adhesive is moderate, if exceed above-mentioned scope, the combination property of diffusion barrier sheet can reduce.
The thickness of described diffusion coating is the 1/100-50/100 of diffusion particle particle diameter.Preferably, the thickness of described diffusion coating is the 10/100-40/100 of diffusion particle particle diameter; Preferred, the thickness of described diffusion coating is the 15/100-30/100 of diffusion particle particle diameter.The thickness of described diffusion coating refers to the thickness of adhesive in diffusion coating.Preferably, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 80-110 weight portion; Preferred, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 90-95 weight portion.
Preferably, the particle diameter coefficient of variation of described diffusion particle is less than or equal to 10%, or is less than or equal to 5%.Described diffusion particle particle diameter is 15-35 μ m or 25-35 μ m.Described diffusion particle is organic diffusion particle of spherical or elliposoidal, is selected from the combination of a kind of in polymethylmethacrylate, poly-n-butyl methacrylate, polystyrene, silicone resin or at least two kinds.Described adhesive is the combination of a kind of in acryl resin, urethane resin, epoxy resin or at least two kinds.
Further, described protective finish comprises the adhesive of 100 weight portions and the anti-stick particle that connects of 0.1-1 weight portion.Described adhesive is selected from the combination of a kind of in acryl resin, urethane resin, epoxy resin or at least two kinds.Described anti-stick even particle is organic filler, is selected from combinations a kind of in polymethylmethacrylate, poly-n-butyl methacrylate, polystyrene, silicone resin or at least two kinds.
Further, described transparent base is selected from a kind of in polycarbonate (PC), polyethylene terephthalate (PET), polyamide (PA), polystyrene (PS), tygon (PE), polymethylmethacrylate (PMMA).Described base material is water white base material, and refractive index is 1.4-1.75.The refractive index of above-mentioned base material is suitable, can improve to a certain extent the visible angle of diffusion barrier sheet.
Further, the thickness of described transparent base is 10-300 μ m.Preferably, the thickness of described transparent base is 30-100 μ m, 100-200 μ m.
Further, described diffusion particle is selected from the combination of a kind of in polymethylmethacrylate, poly-n-butyl methacrylate, polystyrene, silicone resin or at least two kinds; Described protective finish comprises the adhesive of 100 weight portions and the anti-stick particle that connects of 0.1-1 weight portion.
Further, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 85-110 weight portion; The particle diameter of described diffusion particle is 15-35 μ m, is selected from polymethylmethacrylate, polystyrene or its combination.
Further, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 90-95 weight portion; The particle diameter of described diffusion particle is 25-35 μ m, is selected from polymethylmethacrylate, polystyrene or its combination.Described transparent base is selected from polycarbonate (PC) or polyethylene terephthalate (PET), and described diffusion coating adhesive is acryl resin, epoxy resin or its combination.The thickness of described diffusion coating is the 10/100-40/100 of diffusion particle particle diameter.
Further, select the PET transparent membrane as base material, thickness is 150 μ m, surface-coated diffusion layer thereon, and described diffusion coating comprises the epoxy resin of 100 weight portions, the polystyrene particle of 60 weight portions and the polymethylmethacrylate particle of 30 weight portions; The particle diameter of described diffusion particle is 35 μ m, and described protective finish comprises the epoxy resin of 100 weight portions and the poly-n-butyl methacrylate particle of 0.5 weight portion.The thickness of described diffusion coating is the 20/100-40/100 of diffusion particle particle diameter.
Between diffusion particle in above-mentioned diffusion coating, be formed with gap.
The present invention also provides a kind of preparation method of diffusion barrier sheet of above-mentioned raising visible angle, and described preparation method comprises the steps:
Step 1, preparation diffusion coating fluid: add successively adhesive, diffusion particle, stir, and add solvent, regulate coating fluid viscosity, make it be suitable for coating process;
Step 2, prepare diffusion layer: step 1 gained coating fluid is coated on transparent base, and puts into the oven ageing 0.5-8 hour of 60 ℃-150 ℃;
Step 4, prepare protective finish: the protective finish coating fluid is coated on to the lower surface (being another surface) of transparent base, and puts into the oven ageing 0.5-8 hour of 60 ℃-150 ℃.
In above-mentioned steps 1 and step 3, add appropriate solvent adjustment coating fluid viscosity, the viscosity of coating fluid is convenient to coating process with coating fluid and is advisable.
The present invention also provides a kind of backlight module, and described backlight module comprises above-mentioned diffusion barrier sheet, or described backlight module comprises diffusion barrier sheet prepared by said method.
Compared with prior art, the diffusion barrier sheet of raising visible angle provided by the present invention, because the particle diameter of diffusion particle is identical or the particle diameter coefficient of variation is less than or equal to 15%, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 75-120 weight portion simultaneously, make the diffusion particle can not be arranged together closely, and can form gap, these gaps just show as the light leak of Pinhole-shaped on the diffusion barrier surface.Due to diffusion particle, has the effect that changes radiation direction, just as convex lens one by one make light, concentrate, also just increased front face brightness simultaneously, and can't concentrate to front by the light in these gaps, thereby the light of side is increased, and it is large that visible angle also just becomes.Therefore, diffusion barrier sheet provided by the invention by controlling the diffusion particle particle diameter size and with the ratio of adhesive, control the distribution of light, thereby make diffusion barrier sheet have brightness preferably and transmittance, the backlight module that contains this diaphragm has larger visible angle.The TCO value of existing backlight module is 1.75-1.85, and utilizes the TCO value of the backlight module of diffusion barrier sheet provided by the invention can reach the scope of 1.4-1.65, has the effect of the angle of visibility of raising liquid crystal display.
The accompanying drawing explanation
Fig. 1 is a kind of schematic diagram that improves the diffusion barrier sheet of visible angle provided by the invention;
Fig. 2 is the brightness change curve of existing backlight module all angles;
The brightness change curve of the backlight module all angles of the diffusion barrier sheet that contains the embodiment of the present invention 1 and provide is provided Fig. 3;
The schematic diagram of step 1 of the method for backlight module visible angle is measured in Fig. 4-1 for the present invention;
The schematic diagram of step 2 of the method for backlight module visible angle is measured in Fig. 4-2 for the present invention.
Wherein, 102 is transparent base, and 101 is diffusion coating, and 1011 is diffusion particle, and 1012 is adhesive, and 103 is protective finish, and 402 are the brightness instrument, and 401 is backlight module.
Embodiment
As shown in Figure 1, the diffusion barrier sheet of raising visible angle provided by the invention comprises transparent base 102, diffusion coating 101 and protective finish 103; Described diffusion coating 101 and protective finish 103 are positioned at the both sides of described transparent base 102, and described diffusion coating 101 comprises adhesive 1012 and diffusion particle 1011; Described diffusion particle 1011 coheres the upper surface at described transparent base 102 by adhesive 1012, and the identical or particle diameter coefficient of variation of the particle diameter of described particle 1011 is less than or equal to 15%.
As shown in Figure 2, existing backlight module front face brightness is the highest, and brightness is along with the change of display deviation angle is large, and obviously reduction, namely in the time of 0 °, brightness is best, and while departing from certain angle, brightness descends.In Fig. 2, in the time of 0 °, brightness is about 1380cd/m
2When departing from 30 ° to 33 °, brightness is about 1000cd/m
2.
As shown in Figure 3, the backlight module front face brightness that contains diffusion barrier sheet provided by the invention is the highest, and brightness is along with the change of display deviation angle reduces greatly, but, compare Fig. 2, the brightness downtrending is not obvious, and the front face brightness also existing backlight module than shown in Figure 2 is high.In Fig. 3, in the time of 0 °, brightness is about 1460cd/m
2When departing from 30 ° to 33 °, brightness is about 1150cd/m
2.When departing from 42 ° to 45 °, brightness is about 1000cd/m
2.By relatively learning of Fig. 2 and Fig. 3, utilize the backlight module of diffusion barrier sheet provided by the invention, have the brightness of raising liquid crystal display and the effect of angle of visibility.
With said method, prepare diffusion barrier sheet of the present invention, its performance test methods is as follows:
Luminance test: get the diaphragm of an A4 size, be placed in backlight module, light under the rated voltage of 24V, by brightness instrument (model: BH-7) measure its brightness and visible angle.
Mist degree and transmittance test: get the diaphragm of an A4 size, put into mist degree instrument its mist degree of test and light transmittance values.
Described visible angle is by calculating, available TCO value representation.The TCO value is less, and the backlight module visible angle is higher.As shown in Fig. 4-1, when backlight module 401 during to 30 ° of right rotations, measure respectively the brightness value of 2 of A, B, be designated as respectively PRA and PRB; As shown in Fig. 4-2, when backlight module 401 during to 30 ° of anticlockwises, measure respectively the brightness value of 2 of A, B, be designated as respectively PLA and PLB, TCO value=(PRA/PRB+PLA/PLB)/2.Wherein, the point of the A on backlight module and B point equate to the distance of central point.
Wherein suppose PRA > PRB, PLA > PLB, be actually higher value divided by smaller value.The TCO value should be greater than 1.The backlight module visible angle is higher, and the TCO value is less.
According to preceding method, prepare diffusion barrier sheet, specific as follows:
Embodiment 1:
The invention provides a kind of diffusion barrier sheet that improves visible angle; wherein; selecting PET material, thickness is that the transparent membrane of 100 μ m is as base material; surface-coated diffusion layer thereon; diffusion layer comprises the urethane resin of 100 parts by weight and the diffusion particle of 85 weight portions, and the material of described diffusion particle is polymethylmethacrylate, and particle diameter is 9-10 μ m; the particle diameter coefficient of variation is 5%, and the diffusion barrier lower surface is provided with protective finish.
Embodiment 2:
The invention provides a kind of diffusion barrier sheet that improves visible angle; wherein; selecting PC material, thickness is that the transparent membrane of 75 μ m is as base material; surface-coated diffusion layer thereon; diffusion layer comprises the urethane resin of 100 weight portions and the diffusion particle of 90 weight portions, and the material of described diffusion particle is polystyrene, and particle diameter is 14-15 μ m; the particle diameter coefficient of variation is 3.5%, and the diffusion barrier lower surface is provided with protective finish.
Embodiment 3:
The invention provides a kind of diffusion barrier sheet that improves visible angle; wherein; selecting PET material, thickness is that the transparent membrane of 75 μ m is as base material; surface-coated diffusion layer thereon, diffusion layer comprises the urethane resin of 100 parts by weight and the diffusion particle of 100 weight portions, and the material of described diffusion particle is polymethylmethacrylate; particle diameter is 20 μ m; the particle diameter coefficient of variation is less, can ignore, and the diffusion barrier lower surface is provided with protective finish.
Embodiment 4
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PA transparent membrane as base material, thickness is 10 μ m, surface-coated diffusion layer thereon, diffusion layer comprises the urethane resin of 100 parts by weight and the silicone resin particle of 75 weight portions, and the particle diameter of described diffusion particle is 8 μ m, the particle diameter coefficient of variation is less, can ignore; The thickness of described diffusion coating is the 15/100-20/100 of diffusion particle particle diameter; Described protective finish comprises the acryl resin of 100 weight portions and the polymethylmethacrylate particle of 0.1 weight portion.
Embodiment 5:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PS transparent membrane as base material, thickness is 100 μ m, surface-coated diffusion layer thereon, diffusion layer comprises the urethane resin of 100 weight portions and the polystyrene particle of 120 weight portions, and the particle diameter of described diffusion particle is 33-35 μ m, and the particle diameter coefficient of variation is 3%; The thickness of described diffusion coating is the 1/100-5/100 of diffusion particle particle diameter; Described protective finish comprises the urethane resin of 100 weight portions and the poly-n-butyl methacrylate particle of 1 weight portion.
Embodiment 6:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PE transparent membrane as base material, thickness is 300 μ m, surface-coated diffusion layer thereon, diffusion layer comprises the urethane resin of 100 parts by weight, the poly-n-butyl methacrylate particle of 50 weight portions and the polystyrene particle of 50 weight portions, and the particle diameter of described diffusion particle is 30-32 μ m, and the particle diameter coefficient of variation is 3%; The thickness of described diffusion coating is the 45/100-50/100 of diffusion particle particle diameter; Described protective finish comprises the epoxy resin of 100 weight portions and the polystyrene particle of 0.5 weight portion.
Embodiment 7:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PMMA transparent membrane as base material, thickness is 30 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the acryl resin of 100 weight portions and the polystyrene particle of 85 weight portions; The particle diameter of described diffusion particle is 15-16 μ m, and the particle diameter coefficient of variation is 4%, and the thickness of described diffusion coating is the 10/100-15/100 of diffusion particle particle diameter; Described protective finish comprises the urethane resin of 100 weight portions and the polystyrene particle of 0.8 weight portion.
Embodiment 8:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PET transparent membrane as base material, thickness is 100 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the epoxy resin of 100 weight portions and the polymethylmethacrylate particle of 110 weight portions; The particle diameter of described diffusion particle is 24-25 μ m, and the particle diameter coefficient of variation is 2%, and the thickness of described diffusion coating is the 30/100-35/100 of diffusion particle particle diameter; Described protective finish comprises the epoxy resin of 100 weight portions and the polystyrene particle of 0.3 weight portion.
Embodiment 9:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PMMA transparent membrane as base material, thickness is 200 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the epoxy resin of 100 weight portions, the polystyrene particle of 70 weight portions and the polymethylmethacrylate particle of 30 weight portions; The particle diameter of described diffusion particle is 30-35 μ m, and the particle diameter coefficient of variation is 5%, and described protective finish comprises the epoxy resin of 100 weight portions and the silicone resin particle of 0.8 weight portion.The thickness of described diffusion coating is the 10/100-45/100 of diffusion particle particle diameter.
Embodiment 10:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PET transparent membrane as base material, thickness is 50 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the acryl resin of 100 weight portions and the polymethylmethacrylate particle of 90 weight portions; The particle diameter of described diffusion particle is 25 μ m; the particle diameter coefficient of variation is less; can ignore, the thickness of described diffusion coating is the 10/100-12/100 of diffusion particle particle diameter, and described protective finish comprises the acryl resin of 100 weight portions and the polystyrene particle of 0.3 weight portion.
Embodiment 11:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PC transparent membrane as base material, thickness is 300 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the epoxy resin of 100 weight portions and the polystyrene particle of 95 weight portions; The particle diameter of described diffusion particle is 25-30 μ m; the particle diameter coefficient of variation is 5%; the thickness of described diffusion coating is the 28/100-30/100 of diffusion particle particle diameter, and described protective finish comprises the epoxy resin of 100 weight portions and the silicone resin particle of 0.8 weight portion.
Embodiment 12:
The invention provides a kind of diffusion barrier sheet that improves visible angle, wherein, select the PET transparent membrane as base material, thickness is 150 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the epoxy resin of 100 weight portions, the polystyrene particle of 60 weight portions and the polymethylmethacrylate particle of 30 weight portions; The particle diameter of described diffusion particle is 35 μ m, and the particle diameter coefficient of variation is less, can ignore, and described protective finish comprises the epoxy resin of 100 weight portions and the poly-n-butyl methacrylate particle of 0.5 weight portion.The thickness of described diffusion coating is the 20/100-40/100 of diffusion particle particle diameter.
Comparative Examples 1:
A kind of diffusion barrier sheet; wherein; select the PET material, thickness be the transparent membrane of 100um as base material, surface-coated diffusion layer thereon; diffusion layer comprises the urethane resin of 100 parts by weight and the diffusion particle of 60 weight portions; the material of described diffusion particle is polymethylmethacrylate, and particle diameter is polydispersion, is 1-15 μ m; the particle diameter coefficient of variation is 80%, and the diffusion barrier lower surface is provided with protective finish.
Table 1 embodiment and Comparative Examples gained diffusion barrier sheet optical performance test
| ? | Mist degree | Transmittance | Brightness (cd/m 2） | The TCO value |
| Embodiment 1 | 90.11% | 90.56% | 2196 | 1.58 |
| Embodiment 2 | 90.89% | 89.14 | 2162 | 1.55 |
| |
92.38% | 88.42% | 2199 | 1.54 |
| Embodiment 4 | 88.72% | 90.71% | 2098 | 1.51 |
| Embodiment 5 | 92.94% | 90.8% | 2273 | 1.54 |
| |
92.23% | 89.73 | 2194 | 1.50 |
| Embodiment 7 | 90.66% | 90.43% | 2099 | 1.53 |
| Embodiment 8 | 92.83% | 90.21% | 2195 | 1.50 |
| |
91.65% | 89.82% | 2276 | 1.49 |
| Embodiment 10 | 91.21% | 92.36% | 2245 | 1.42 |
| Embodiment 11 | 91.68% | 92.46% | 2273 | 1.43 |
| |
92.57% | 93.48% | 2297 | 1.40 |
| Comparative Examples 1 | 83.67% | 93.19% | 1879 | 1.80 |
By table 1 performance test data, can be drawn, the optical diffusion sheet that the embodiment of the present invention provides is compared with Comparative Examples, has higher brightness, transmittance and mist degree preferably.This diffusion barrier sheet is when improving brightness, uniform light, and the TCO value can reach the scope of 1.4-1.65, has the effect that improves angle of visibility.The diffusion particle particle diameter is larger, and the particle diameter coefficient of variation is less or the visible angle diffusion barrier sheet that the diffusion particle particle diameter is identical is higher, and its TCO value is lower; Especially embodiment 12, and the ratio of its diffusion particle and adhesive is moderate, and particle diameter is basic identical, and the gained diffusion barrier sheet has higher brightness, and the TCO value is lower, can improve largely visible angle.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Every equalization that content is done according to the present invention changes and modifies, and all is encompassed in the scope of the claims of the present invention.
Claims (10)
1. a diffusion barrier sheet that improves visible angle, is characterized in that, described diffusion barrier sheet comprises transparent base, diffusion coating and protective finish; Described diffusion coating and protective finish lay respectively at the both sides of described transparent base, and described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 75-120 weight portion; Described diffusion particle coheres the upper surface at described transparent base by adhesive, and the identical or particle diameter coefficient of variation of the particle diameter of described diffusion particle is less than or equal to 15%, and described diffusion particle particle diameter is 8-35 μ m.
2. the diffusion barrier sheet of raising visible angle according to claim 1, is characterized in that, described protective finish comprises the adhesive of 100 weight portions and the anti-stick particle that connects of 0.1-1 weight portion.
3. the diffusion barrier sheet of raising visible angle according to claim 1, is characterized in that, described transparent base is selected from a kind of in polycarbonate, polyethylene terephthalate, polyamide, polystyrene, tygon, polymethylmethacrylate.
4. the diffusion barrier sheet of raising visible angle according to claim 1, is characterized in that, the thickness of described transparent base is 10-300 μ m.
5. the diffusion barrier sheet of raising visible angle according to claim 1, is characterized in that, described diffusion particle is selected from the combination of a kind of in polymethylmethacrylate, poly-n-butyl methacrylate, polystyrene, silicone resin or at least two kinds; Described protective finish comprises the adhesive of 100 weight portions and the anti-stick particle that connects of 0.1-1 weight portion.
6. the diffusion barrier sheet of raising visible angle according to claim 1, is characterized in that, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 85-110 weight portion; The particle diameter of described diffusion particle is 15-35 μ m, is selected from polymethylmethacrylate, polystyrene or its combination.
7. the diffusion barrier sheet of raising visible angle according to claim 1, is characterized in that, described diffusion coating comprises the adhesive of 100 weight portions and the diffusion particle of 90-95 weight portion; The particle diameter of described diffusion particle is 25-35 μ m, is selected from polymethylmethacrylate, polystyrene or its combination.
8. the diffusion barrier sheet of raising visible angle according to claim 1, it is characterized in that, select the PET transparent membrane as base material, thickness is 150 μ m, surface-coated diffusion layer thereon, described diffusion coating comprises the epoxy resin of 100 weight portions, the polystyrene particle of 60 weight portions and the polymethylmethacrylate particle of 30 weight portions; The particle diameter of described diffusion particle is 35 μ m, and described protective finish comprises the epoxy resin of 100 weight portions and the poly-n-butyl methacrylate particle of 0.5 weight portion.
9. according to the preparation method of the diffusion barrier sheet of the described raising visible angle of one of claim 1-8, it is characterized in that, described preparation method comprises the steps:
Step 1, preparation diffusion coating fluid: add successively adhesive, diffusion particle, stir, and add solvent, regulate coating fluid viscosity, make it be suitable for coating process;
Step 2, prepare diffusion layer: step 1 gained coating fluid is coated on transparent base, and puts into the oven ageing 0.5-8 hour of 60 ℃-150 ℃;
Step 3, prepare the protective finish coating fluid: add successively adhesive, the anti-stick particle that connects, stir, and add solvent, regulate coating fluid viscosity, make it be suitable for coating process;
Step 4, prepare protective finish: the protective finish coating fluid is coated on to the lower surface (being another surface) of transparent base, and puts into the oven ageing 0.5-8 hour of 60 ℃-150 ℃.
10. a backlight module, is characterized in that, described backlight module comprises the described diffusion barrier sheet of one of claim 1-8, or described backlight module comprises diffusion barrier sheet prepared by the described method of claim 9.
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