CN204404072U - The novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film - Google Patents
The novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film Download PDFInfo
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- CN204404072U CN204404072U CN201520107468.0U CN201520107468U CN204404072U CN 204404072 U CN204404072 U CN 204404072U CN 201520107468 U CN201520107468 U CN 201520107468U CN 204404072 U CN204404072 U CN 204404072U
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Abstract
The utility model relates to backlighting technology field, specifically refers to the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film.Comprise lens body, described lens body comprises the plane of incidence, exit facet and bottom surface, the outer surface of described exit facet has antireflective coating, described anti-reflection film effectively reduces the boundary reflection rate of exit facet, thus effectively reduce exit facet Fresnel boundary reflection light, the light that the illumination light field improved caused by Fresnel boundary reflection light is positioned at lens upper center region is piled up, make the distribution of light more reasonable, good backlighting effect is reached with this, in addition this antireflective coating is also from the light penetration making this lens ensemble improve light source, improve the utilization rate of light energy, efficient energy-saving, be with a wide range of applications.
Description
Technical field
The utility model relates to backlighting technology field, specifically refers to the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film.
Background technology
The back lighting mode of the LED-backlit illumination of present liquid crystal display television and LED panel lamp etc. has two kinds usually with light structures: a kind of side (LED light axle is substantially vertical with light guide plate side) for plurality of LEDs being placed on light guide plate, the light that LED sends enters into light guide plate through light guide plate side, there is multiple total reflection and refraction in light guide plate after, finally all light transmits through the front of light guide plate, by accurately controlling light guide plate reflection and the ratio of refraction, uniform exiting surface can be formed in light guide plate front; This mode is often referred to as side entering type lighting system.
Another plurality of LEDs light source is placed on the diffuser plate back side (in this method, LED light axle is substantially vertical with the diffuser plate back side), in order to the irradiation of uniform light sent by LED is at the diffuser plate back side, need between each LED and diffuser plate, place a secondary light-distribution lens, after the light that LED sends by light-distribution lens carries out secondary distribution, be radiated at the back side of diffuser plate uniformly; Such light enters into diffuser plate inside through the diffuser plate back side and spreads again, goes out to shoot out from the front of diffuser plate, and can form uniform exiting surface in diffuser plate front, this mode is often referred to as straight-down negative lighting system.
Above-mentioned two kinds of lighting systems are compared, and form same lighting area, and the light travel path of side entering type is much larger than straight-down negative, and the light extraction efficiency of side entering type is low, so adopt, its energy consumption of lighting system of side entering type is high, cost is high.
In recent years along with further application and the popularization of the LED-backlit illumination of display (such as flat panel television display) and the product of LED panel lamp etc.The power conservation requirement of corresponding product and the demand of cost control are also come urgently; Traditional side entering type lighting system that under such background, efficiency is lower is progressively being replaced by straight-down negative lighting system.
The development trend of current LED downward back optical illumination is: under the prerequisite as far as possible increasing the spacing (mainly in order to reduce LED quantity in same area) between LED, reduce the thickness (mainly in order to reduce system bulk) from LED light source to diffuser plate, also will ensure the uniformity of irradiating simultaneously.This has higher requirement to light-distribution lens.
In prior art, in order to increase the spacing between LED, compress the distance between LED and diffuser plate simultaneously, as shown in Figure 1, some straight-down negative systems adopt reflective lens to carry out secondary distribution to the light that LED sends, light 120 scioptics 130 allowing the LED110 of considerable part send reflex on the reflector layer 140 on system inner chamber, and then to reflex on diffuser plate 150.Although this lighting system can reduce spatial altitude, the characteristic of reflector layer is relied on comparatively large, require higher to the surface precision of lens and the smooth depth of installation accuracy and reflector layer etc. simultaneously, therefore more difficultly realize Uniform Illumination.
The straight-down negative system also had now adopts refraction type lens to carry out secondary distribution to the light that LED sends, but be difficult to spacing distance between LED large and the spacing of LED and diffuser plate is little realize Uniform Illumination.
As shown in Figure 2, one of reason causing illumination unevenness is that lens 220 plane of incidence 221 is fairly simple with the face shape of exit facet 223, the plane of incidence of some lens and exit facet adopt many spheres to be spliced, the simple conical surface of some employings, this light that LED light source is sent is difficult to effectively distribute in polarizers of big angle scope according to the demand of back lighting.
Another major reason is light when propagating in different medium, and light is by always also existing Fresnel boundary reflection during interface, and the larger Fresnel boundary reflection effect of incident angle is more obvious.When usually propagating from optically thinner medium to optically denser medium, after incidence angle is greater than 60 °, the increase along with incidence angle is risen by its Fresnel boundary reflection rate; From optically denser medium to optically thinner medium, during transmission, Fresnel boundary reflection is then more remarkable, and after incidence angle is greater than 30 °, the increase along with incidence angle is sharply risen by its Fresnel boundary reflection rate.
The light sent from LED light source enters lens body after the refraction of the plane of incidence, when reaching exit facet, some light reflects away through exit facet, and in addition some light by boundary reflection to lens interior, this part reflection ray is after the multiple reflections and refraction of lens base or system inner chamber reflecting surface etc. multiple, above LED, gathering of light (energy) can be formed by mid portion region, have a strong impact on the uniformity of lens outgoing light field.
With reference in figure 2, sent the light 231 entering lens 220 by the LED light source 210 be positioned at below the plane of incidence and can be separated when arriving exit facet 223, become refracted ray 232 and Fresnel reflected rays 233.Usual refracted ray 232 can carry most of energy and directly be mapped to diffuser plate 250, Fresnel reflected rays 233 then can be carried small part energy and is reflected back lens interior, then through bottom lens body 222 or lens body bottom under reflections off objects after form secondary reflection light 234, reflect lens when secondary reflection light 234 encounters exit facet 223 again and become light 235, light 235 is advanced after stretch journey and is arrived diffuser plate 250.Can find out that light 235 can by mid portion region gather above LED210 by light course.Because light 231 is enter optically thinner medium by optically denser medium when arriving exit facet 223, therefore Fresnel boundary reflection effect is comparatively obvious, there is higher reflectivity, therefore the phenomenon leaning on mid portion zonal ray (energy) to gather above the LED210 caused due to Fresnel boundary reflection is comparatively remarkable, finally has influence on the uniformity of back lighting.
Utility model content
In order to solve the problems of the prior art, the utility model provides the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film, increase the light transmittance of exit facet, the accumulation of the emergent ray caused by Fresnel boundary reflection in center light field can be reduced, the emergent ray of lens is spatially more reasonably distributed.
In order to realize above-mentioned technique effect, the utility model takes following technical scheme:
The utility model proposes the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film, comprise lens body, wherein said lens body comprises exit facet, the plane of incidence and bottom surface; Described bottom surface is positioned at the bottom of described lens body, is connected with the described plane of incidence near the side of lens body central shaft;
The described plane of incidence is positioned at the bottom centre of described lens body, caves in lens body top-direction;
Wherein said exit facet has antireflective coating, described antireflective coating adds the light transmittance of exit facet, through the light transmittance improving exit facet, reduce the Fresnel boundary reflection effect of exit facet, and then the emergent ray improved caused by the Fresnel boundary reflection light of exit facet is in the accumulation problem of center light field, more reasonably distributes light; The utilization rate of the light energy of light source can be improved on the whole simultaneously, the usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect can also realize the thickness reduced from LED light source to diffuser plate simultaneously, reduces the volume of system.
Further, described anti-reflection film can be multilayer also can be individual layer.
Preferred as one, the material of described anti-reflection film can be silica, magnesium fluoride, calcirm-fluoride, titanium oxide, vulcanized lead or lead selenide.
Preferred as one, described anti-reflection film is in the mode of vacuum evaporation, and evaporation is in the outer surface of described exit facet.
Preferred as one, described anti-reflection film is chemical vapour deposition (CVD) mode, is deposited on the outer surface of described exit facet.
Preferred as one, described anti-reflection film is the mode of sol-gel coating gel mould, spray or leaching figure, is plated on the outer surface of described exit facet.
This patent provides a kind of backlight illuminating system further, and comprise the LED light source that is arranged on pcb board and be arranged on to realize this direct-type backlight LED lens of secondary light-distribution above LED light source, described lens are said lens.Such system can be implemented in same lighting area and under the prerequisite of same illuminance uniformity, increase the distance between LED light source, reduce LED quantity, and shorten the distance between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Further, described system also comprises diffuser plate, and described diffuser plate is arranged on the front of described lens.The light that LED light source on pcb board can further send by the application of described diffuser plate is better, evenly be diffused into exiting surface.
The utility model also comprises a kind of TV, comprise backlight illuminating system, described backlight illuminating system comprises the LED light source that is arranged on pcb board and is arranged on to realize this direct-type backlight LED lens of secondary light-distribution above LED light source, and described lens are the direct-light type LED backlight illumination light-distribution lens with anti-reflection film novel described in this patent.
The utility model also comprises a kind of panel light, comprises backlight illuminating system, described backlight illuminating system comprise realize secondary light-distribution this patent described in the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film.
the utility model has following beneficial effect:this novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film, utilize simple anti-reflection film principle, through the light transmittance improving exit facet, reduce the Fresnel boundary reflection effect of exit facet, and then the emergent ray improved caused by the Fresnel boundary reflection light of exit facet is in the accumulation problem of center light field, more reasonably distributes light; The utilization rate of the light energy of light source can be improved on the whole simultaneously, the usage quantity of the LED light source on LED-backlit panel can be reduced under the prerequisite realizing same illuminating effect, the thickness reduced from LED light source to diffuser plate can also be realized simultaneously, reduce the volume of system.
Accompanying drawing explanation
Fig. 1 is reflective backlight lens combination schematic diagram in prior art.
Fig. 2 is the system schematic of refraction type backlight lens in prior art.
Fig. 3 is generalized section of the present utility model.
Fig. 4 is the Fresnel boundary reflection schematic diagram not augmenting permeable membrane in prior art bottom lens.
Fig. 5 is the absorption schematic diagram of Fresnel boundary reflection light of the present utility model.
Detailed description of the invention
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
In order to solve the problems of the prior art, the utility model provides the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film, increase the light transmittance of exit facet, the accumulation of the emergent ray caused by Fresnel boundary reflection in center light field can be reduced, the emergent ray of lens is spatially more reasonably distributed.
In order to realize above-mentioned technique effect, the utility model takes following technical scheme:
The utility model proposes the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film, as shown in Figure 3, comprise lens body 300, wherein said lens body 300 comprises exit facet 302, the plane of incidence 301 and bottom surface 303; Described bottom surface 303 is positioned at the bottom of described lens body 300, is connected with the described plane of incidence 301 near the side of lens body 300 central shaft;
, in the bottom centre of described lens body 300, cave in lens body 300 top-direction in described plane of incidence position 301;
Wherein said exit facet 302 has antireflective coating 304, described anti-reflection film 304 adds the light transmittance of exit facet 302, significantly reduce the accumulation of the lens body 300 upper area light caused by the Fresnel boundary reflection light of exit facet 302, the emergent ray of lens is spatially more reasonably distributed, improve light-out effect, improve the utilization rate of the light energy in lens on light source on the whole simultaneously, the usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect can also realize the thickness reduced from LED light source to diffuser plate simultaneously, the volume of reduction system.In prior art, the Fresnel boundary reflection light of exit facet is stacked into the schematic diagram of lensed tip as shown in Figure 4 after the reflection of bottom surface, and the paths principle of these lens as shown in Figure 5 (namely wherein shown in dotted line is Fresnel boundary reflection light).Be construed as diagram of the present utility model and be only schematic, do not represent the actual propagation path of actual ratio and light.
Further, described anti-reflection film 304 can be multilayer also can be individual layer.
Preferred as one, the material of described anti-reflection film can be silica, magnesium fluoride, calcirm-fluoride, titanium oxide, vulcanized lead or lead selenide.
Preferred as one, described anti-reflection film is in the mode of vacuum evaporation, and evaporation is in the outer surface of described exit facet.
Preferred as one, described anti-reflection film is chemical vapour deposition (CVD) mode, is deposited on the outer surface of described exit facet.
Preferred as one, described anti-reflection film is the mode of sol-gel coating, is plated on the outer surface of described exit facet.
This patent provides a kind of backlight illuminating system further, and comprise the LED light source that is arranged on pcb board and be arranged on to realize this direct-type backlight LED lens of secondary light-distribution above LED light source, described lens are said lens.Such system can be implemented in same lighting area and under the prerequisite of same illuminance uniformity, increase the distance between LED light source, reduce LED quantity, and shorten the distance between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Further, described system also comprises diffuser plate, and described diffuser plate is arranged on the front of described lens.The light that LED light source on pcb board can further send by the application of described diffuser plate is better, evenly be diffused into exiting surface.
The utility model also comprises a kind of TV, comprise backlight illuminating system, described backlight illuminating system comprises the LED light source that is arranged on pcb board and is arranged on to realize this direct-type backlight LED lens of secondary light-distribution above LED light source, and described lens are the direct-light type LED backlight illumination light-distribution lens with anti-reflection film novel described in this patent.
The utility model also comprises a kind of panel light, comprises backlight illuminating system, described backlight illuminating system comprise realize secondary light-distribution this patent described in the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film.
The utility model is not limited to aforesaid detailed description of the invention.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Be only preferred embodiment of the present utility model described in upper, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalently to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film, comprise lens body, wherein said lens body comprises exit facet, the plane of incidence and bottom surface; It is characterized in that, described exit facet has antireflective coating.
2. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film as claimed in claim 1, is characterized in that, described anti-reflection film is individual layer or is sandwich construction.
3. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film as claimed in claim 2, it is characterized in that, described antireflective coating improves the light transmittance of exit facet, reduces the Fresnel boundary reflection light of described exit facet.
4. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film as claimed in claim 2, it is characterized in that, the material of described anti-reflection film is silica, magnesium fluoride, calcirm-fluoride, titanium oxide, vulcanized lead or lead selenide.
5. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film as claimed in claim 2, it is characterized in that, described anti-reflection film is in the mode of vacuum evaporation, and evaporation is in the outer surface of described exit facet.
6. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film as claimed in claim 2, it is characterized in that, described anti-reflection film is chemical vapour deposition (CVD) mode, is deposited on the outer surface of described exit facet.
7. the novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film as described in one of claim 2 to 5, is characterized in that, described anti-reflection film is the mode of colloidal sol-gel mould, spray or leaching figure, is plated on the outer surface of described exit facet.
8. a backlight illuminating system, comprises the direct-type backlight LED lens established and realize secondary light-distribution, it is characterized in that, described lens are the lens described in one of claim 1 to 7.
9. a TV, comprises backlight illuminating system, and described backlight illuminating system realizes this direct-type backlight LED lens of secondary light-distribution, it is characterized in that, described lens are the lens described in one of claim 1 to 7.
10. a panel light, comprises backlight illuminating system, and described backlight illuminating system comprises the direct-type backlight LED lens realizing secondary light-distribution, it is characterized in that, described lens are the lens described in one of claim 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520107468.0U CN204404072U (en) | 2015-02-14 | 2015-02-14 | The novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520107468.0U CN204404072U (en) | 2015-02-14 | 2015-02-14 | The novel direct-light type LED backlight illumination light-distribution lens with anti-reflection film |
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| CN204404072U true CN204404072U (en) | 2015-06-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108307601A (en) * | 2017-12-20 | 2018-07-20 | 深圳怡钛积科技股份有限公司 | A kind of sapphire cover board and preparation method thereof, terminal device |
| CN111175882A (en) * | 2018-11-12 | 2020-05-19 | 安徽亦知企业管理有限公司 | Light guide plate |
-
2015
- 2015-02-14 CN CN201520107468.0U patent/CN204404072U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108307601A (en) * | 2017-12-20 | 2018-07-20 | 深圳怡钛积科技股份有限公司 | A kind of sapphire cover board and preparation method thereof, terminal device |
| CN108307601B (en) * | 2017-12-20 | 2020-11-10 | 深圳怡钛积科技股份有限公司 | Sapphire cover plate, preparation method thereof and terminal device |
| CN111175882A (en) * | 2018-11-12 | 2020-05-19 | 安徽亦知企业管理有限公司 | Light guide plate |
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