CN103744229A - Backlight angle control method based on refraction index matching - Google Patents
Backlight angle control method based on refraction index matching Download PDFInfo
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- CN103744229A CN103744229A CN201310672869.6A CN201310672869A CN103744229A CN 103744229 A CN103744229 A CN 103744229A CN 201310672869 A CN201310672869 A CN 201310672869A CN 103744229 A CN103744229 A CN 103744229A
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Abstract
A backlight angle control method based on refraction index matching is characterized in that a medium layer which meets the requirement for the needed refractive index is arranged in a prism gap of a prism bright enhancement film of an optical module in a filling mode, light which is emergent out through the prism bright enhancement film passes through the medium layer and then enters air media so that the backlight light-out angle can be controlled, the brightness distortion of backlight is reduced, and meanwhile output of superfluous light at the large angle of an LCD is reduced. According to the backlight angle control method based on refraction index matching, the brightness distortion of the backlight can be reduced, the out-light angle is effectively controlled, and superfluous light output at the large angle of the LCD is reduced.
Description
Technical field
The present invention relates to a kind of display technique, the angle control technology backlight in especially a kind of lcd technology, specifically a kind of angle control method backlight based on index matching.
Background technology
As everyone knows, backlight module is an optical module that back side light source is provided in LCD display product.As shown in figure mono-, its master of backlight module is assembled by assemblies such as wanting light source, light guide plate, diffusion barrier, prismatic brightness film, reflecting plate.In blooming group, it is generally the combination of diffusion barrier, prismatic brightness film.
After light self-diffusion film penetrates, directivity is poor, therefore must utilize prismatic brightness film to revise direction of light.Prismatic brightness film is to form accurate propenyl resin prism structure in surface of polyester, its principle is by the refraction of light, to be reached with reflection to converge light, allow the light that is greater than 70 ° of ejaculations gather to normal direction, by increasing the exitance of light within the scope of 70 °, increase the service efficiency after light self-diffusion film penetrates, make the brightness raising 100% of whole backlight module even higher.A common backlight module can be used two prismatic lenses, and direction is vertical each other, light is focused near angular range normal, thereby increase the front face brightness of display.
Light is from the outgoing of blooming group, and brightness gradually reduces within the scope of certain angle, and while reaching angular distortion point, brightness is uprushed, and affects visual effect, finally causes the output of unnecessary light in display wide-angle, has reduced utilization ratio of optical energy.Therefore be necessary the backlight film group of prior art to improve.
Summary of the invention
The object of the invention is to there will be brightness to uprush for existing back light module unit structure, affect visual effect, finally cause the output of unnecessary light in display wide-angle, reduce the problem of utilization ratio of optical energy, invent a kind of angle control method backlight based on index matching that can reduce brightness distortion.
Technical scheme of the present invention is:
A kind of angle control method backlight based on index matching, it is characterized in that filling the dielectric layer that one deck meets required refractive index in the prism gap of the prismatic brightness film of blooming group, thereby make after described dielectric layer, to enter again through the light of prismatic brightness film outgoing the angle of controlling bright dipping backlight in air dielectric, reduce brightness distortion backlight, reduce the output of unnecessary light in liquid crystal display wide-angle simultaneously.
The thickness of described dielectric layer is not less than the vertical height of prism in prismatic brightness film.
The prism angle of described prismatic brightness film between 80 ° to 100 °,
The rib ranges of indices of refraction of described prismatic brightness film is between 1.55 to 1.65, and the refractive index of dielectric layer is between 1.2-1.4.
The size of the rib of described prismatic brightness film: 20 μ m to 150 μ m.
The rib of described prismatic brightness film is equal pitch or non-equidistant structure.
The transmittance of described dielectric layer is greater than 98%.
Mode backlight can be the backlight or direct-type backlight of side.
Beneficial effect of the present invention:
The present invention has reduced the brightness distortion situation of backlight module, effectively controls rising angle, improves utilization ratio of optical energy, eliminates the output of unnecessary light in display wide-angle, reduces light pollution.
The inventive method is simple, is easy to realize, and brightening effect is remarkable.
Accompanying drawing explanation
Fig. 1 is existing back light module unit structure schematic diagram.
Fig. 2 is the backing structure schematic diagram based on index matching of the present invention.
Fig. 3 is display emitting brightness angular distribution before and after improving.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 2,3.
Essence of the present invention is the conventional using method that changes blooming in backlight module, adds a kind of medium of index matching, and the refractive index between blooming group and air dielectric is more mated.Due to each layer of index matching, the condition of total reflection changes, and light angle distributes and no longer as original, has the problem of brightness distortion.Adjust the parameters such as refractive index, thickness, transmitance add medium simultaneously, can control rising angle.In the prism gap of the present invention by the prismatic brightness film 6 in blooming group, fill the dielectric layer 7 that one deck meets required refractive index, thereby make after described dielectric layer 7, to enter again through the light of prismatic brightness film outgoing the angle of controlling bright dipping backlight in air dielectric, reduce brightness distortion backlight, reduce the output of unnecessary light in liquid crystal display wide-angle simultaneously.
Fig. 2 is a kind of backlight module of flat-panel monitor, adopt side mode backlight, the principle of lower mode backlight is identical, light source is LED 1, and light guide plate 3 bottom surfaces are reflecting plate or reflectance coating 2, and the light that LED sends enters light guide plate 3, effect through light guide plate 3 and reflectance coating 2, at light guide plate 3 upper surface uniforms, in light guide plate 3, be blooming group, select the combination of diffusion barrier and prismatic brightness film.Light is through after diffusion barrier homogenising, and angular distribution is larger, enters prismatic brightness film.Prismatic brightness film is divided into 3 layers, coarse bottom 4, PET base material 5 and propenyl resin rib, between propenyl resin rib, fill full dielectric layer 7, the general transparent material manufacture that adopts transmittance to be greater than 98% of dielectric layer 7, the rib ranges of indices of refraction of prismatic brightness film 6 is between 1.55 to 1.65 time, the refractive index of dielectric layer 7 is between 1.2-1.4, and the prism angle of prismatic brightness film is between 80 ° to 100 °, and the rib of prismatic brightness film is of a size of 20 μ m to 150 μ m.The rib of prismatic brightness film can be equal pitch, can be also non-isometric.In Fig. 2, the design parameter of rib is: structure is isosceles right triangle, pitch 50 μ m, equidistantly, refractive index 1.6.During beam projecting prism film surface, the light generation total reflection of wide-angle, most of concentration of energy exists
within the scope of 35 °,
it is minimum that 45 ° of left and right are down to, and 60 ° of left and right are near total reflection critical, and light ray energy is uprushed, and brightness distortion occurs, as shown in 8 in Fig. 3.The backlight film group using method of comparison diagram 1, after adopting the medium of index matching, total reflection condition changes, and brightness distortion weakens, and wide-angle parasitic light is most of to be eliminated, as shown in 9 in Fig. 3.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (8)
1. the angle control method backlight based on index matching, it is characterized in that filling the dielectric layer that one deck meets required refractive index in the prism gap of the prismatic brightness film of blooming group, thereby make after described dielectric layer, to enter again through the light of prismatic brightness film outgoing the angle of controlling bright dipping backlight in air dielectric, reduce brightness distortion backlight, reduce the output of unnecessary light in liquid crystal display wide-angle simultaneously.
2. method according to claim 1, is characterized in that the thickness of described dielectric layer is not less than the vertical height of prism in prismatic brightness film.
3. method according to claim 1, is characterized in that the prism angle of described prismatic brightness film is between 80 ° to 100 °.
4. method according to claim 1, is characterized in that the rib ranges of indices of refraction of described prismatic brightness film is between 1.55 to 1.65, and the refractive index of dielectric layer is between 1.2-1.4.
5. method according to claim 1, is characterized in that the size of the rib of described prismatic brightness film: 20 μ m to 150 μ m.
6. method according to claim 1, is characterized in that the rib of described prismatic brightness film is equal pitch or non-equidistant structure.
7. method according to claim 1, is characterized in that the transmittance of described dielectric layer is greater than 98%.
8. method according to claim 1, is characterized in that mode backlight is the backlight or direct-type backlight of side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310672869.6A CN103744229A (en) | 2013-12-12 | 2013-12-12 | Backlight angle control method based on refraction index matching |
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| CN201310672869.6A CN103744229A (en) | 2013-12-12 | 2013-12-12 | Backlight angle control method based on refraction index matching |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107065047A (en) * | 2017-02-20 | 2017-08-18 | 张家港康得新光电材料有限公司 | A kind of haze brightness enhancement film |
| CN109212660A (en) * | 2018-10-26 | 2019-01-15 | 合肥京东方光电科技有限公司 | Leaded light component, light collimator assembly, backlight module and display device |
| CN110262128A (en) * | 2019-06-17 | 2019-09-20 | 南京国兆光电科技有限公司 | Backlight angle control method based on index matching |
| CN113241364A (en) * | 2021-06-16 | 2021-08-10 | 京东方科技集团股份有限公司 | Optical structure and display assembly |
| CN113534536A (en) * | 2021-07-14 | 2021-10-22 | 武汉华星光电半导体显示技术有限公司 | Backlight module, preparation method thereof and display device |
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| TW493094B (en) * | 1997-10-22 | 2002-07-01 | Micro Optics Co Ltd | Liquid crystal display element |
| TW523496B (en) * | 1998-06-17 | 2003-03-11 | Nippon Sheet Glass Co Ltd | Planar microlens array and method of manufacturing same |
| CN101339262A (en) * | 2007-07-04 | 2009-01-07 | 群康科技(深圳)有限公司 | Prism piece and backlight module group using same |
| CN102207565A (en) * | 2011-07-01 | 2011-10-05 | 上海凯鑫森产业投资控股有限公司 | Multifunctional optical sheet, and backlight module and liquid crystal display device with optical sheet |
| CN202421530U (en) * | 2012-01-17 | 2012-09-05 | 京东方科技集团股份有限公司 | Light guide board, backlight module and liquid crystal display |
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Patent Citations (5)
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| TW493094B (en) * | 1997-10-22 | 2002-07-01 | Micro Optics Co Ltd | Liquid crystal display element |
| TW523496B (en) * | 1998-06-17 | 2003-03-11 | Nippon Sheet Glass Co Ltd | Planar microlens array and method of manufacturing same |
| CN101339262A (en) * | 2007-07-04 | 2009-01-07 | 群康科技(深圳)有限公司 | Prism piece and backlight module group using same |
| CN102207565A (en) * | 2011-07-01 | 2011-10-05 | 上海凯鑫森产业投资控股有限公司 | Multifunctional optical sheet, and backlight module and liquid crystal display device with optical sheet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107065047A (en) * | 2017-02-20 | 2017-08-18 | 张家港康得新光电材料有限公司 | A kind of haze brightness enhancement film |
| CN109212660A (en) * | 2018-10-26 | 2019-01-15 | 合肥京东方光电科技有限公司 | Leaded light component, light collimator assembly, backlight module and display device |
| CN109212660B (en) * | 2018-10-26 | 2020-01-24 | 合肥京东方光电科技有限公司 | Light guide assembly, light collimation assembly, backlight module and display device |
| CN110262128A (en) * | 2019-06-17 | 2019-09-20 | 南京国兆光电科技有限公司 | Backlight angle control method based on index matching |
| CN113241364A (en) * | 2021-06-16 | 2021-08-10 | 京东方科技集团股份有限公司 | Optical structure and display assembly |
| CN113534536A (en) * | 2021-07-14 | 2021-10-22 | 武汉华星光电半导体显示技术有限公司 | Backlight module, preparation method thereof and display device |
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Application publication date: 20140423 |
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