CN103994396A - LED secondary refraction and reflection lens for direct lighting type backlight source - Google Patents
LED secondary refraction and reflection lens for direct lighting type backlight source Download PDFInfo
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- CN103994396A CN103994396A CN201410202369.0A CN201410202369A CN103994396A CN 103994396 A CN103994396 A CN 103994396A CN 201410202369 A CN201410202369 A CN 201410202369A CN 103994396 A CN103994396 A CN 103994396A
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Abstract
The invention discloses an LED secondary refraction and reflection lens for a direct lighting type backlight source. The LED secondary refraction and reflection lens is an axial symmetry body made of transparent materials. The LED secondary refraction and reflection lens is characterized by being composed of an incident refraction plane, a central reflecting plane, a side emitting plane and a bottom reflecting plane, all of which are curved surfaces, the incident refraction plane is located on the lower portion of the LED secondary refraction and reflection lens, the central reflecting plane is connected with the side emitting plane to form an upper surface, the central reflecting plane is located above the incident refraction plane, and the side emitting plane is a curved surface for connecting the bottom reflecting plane and the central reflecting plane. The curved surfaces can be represented through a quadratic polynomial. The LED secondary refraction and reflection lens is simple in structure, the diffusion distance is reduced, and the chromatic dispersion phenomenon does not exist while the large-angle illumination is achieved and the number of LED particles is not increased. The LED secondary refraction and reflection lens is easy to install and configure, and energy sources are effectively saved.
Description
Technical field
The present invention relates to a kind of bis-refraction-reflection lens of LED for downward back radiant, be mainly applicable to the backlight of downward back radiant, LED-backlit billboard etc.
Background technology
Back light has a large amount of application in conventional liquid crystal (LCD) and large-scale advertisement plate.And traditional cold-cathode tube (CCFL) backlight is replaced by light emitting diode (LED) backlight gradually.And initial backlight utilizes the LGP of back side carving processing to realize, its light source (CCFL of line source or the LED of spot light) imports light into from LGP side, and this kind of mode is due to the restriction of LGP technology, and light efficiency is not high.Light efficiency problem has effectively been improved in directly-down liquid crystal display backlight source.LED belongs to the spot light of limited angle light beam, and direct LED backlight needs hundreds of even thousands of white or three-primary color LED to arrange and forming surface light source forms a large-area planar to throw light on, thereby required LED particle too much causes high cost.
Spot light is changed into area source, is the key technology in LED-backlit source.The light source uniformity and mixed light height are two very important performance indications of backlight.
It is the key factor of restriction LED direct-light-type backlight for the improvement of optical uniformity.Area source based on LED array in LED-backlit source, the uniformity is closely relevant with LED light distribution.In the time there is no mounted lens, LED light distribution approaches Lang Baite and distributes.When utilizing traditional dome-type lens as LED-backlit source, can change the light distribution of LED, reduce beam angle, light is more concentrated near LED axis.No matter adopt any LED packaged type, while using it for the backlight of directly-down type LCD, all can, because light distribution is too concentrated light is concentrated near axis, make backlight be difficult to obtain high evenness.Therefore the backlight that optical uniformity becomes directly-down type LCD is difficult to the problem solving the most.In the time that LED direct-light-type backlight adopts traditional LED packing forms, be to improve the light uniformity, conventionally adopt and increase thickness (increasing mixed light height), or increase the LED density of arranging.This kind of solution increased the volume and weight of backlight, thus popularization and the development of restriction LCD direct-light-type backlight.How to reduce mixed light height and become key index of backlight.Widely used is in the market a kind of circular secondary lens.This scheme through two circular concave surfaces, by refraction mode, increases LED light by LED light dispersion angle, by array arrangement, realize the backlight solution of arranging to reduce mixed light height with less LED array of particles.But along with mixed light height more and more lower (being that thickness requirement is more and more thinner), every lens must reach larger refraction angle.But these scheme lens are due to the dispersion factor of lens material itself, in the time of excessive refraction angle, the refraction angle difference of different wave length is also larger, thereby cause rainbow phenomena, producing color spot affects the white colourity of light source, makes this backlight solution cannot meet the requirement that further reduces mixed light height in not increasing LED amounts of particles.
Summary of the invention
Technical problem to be solved by this invention is to overcome existing above-mentioned deficiency in prior art, being the rainbow dispersion down phenomenon limits that exists in wide-angle when illumination reduces mixed light height not increasing under LED amounts of particles prerequisite, and a kind of new bis-refraction-reflection lens of LED for downward back radiant are provided, can effectively improve by the light source light uniformity on the one hand, and in not increasing LED granule number, further reduce mixed light height, technique effect is good and cost is low.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of bis-refraction-reflection lens of LED for downward back radiant, bis-refraction-reflection lens of described LED are the axial symmetry entity that adopts transparent material to make, it is characterized in that bis-refraction-reflection lens of described LED are by incident plane of refraction, central authorities' reflecting surface, side exit facet, bottom reflection face composition, described incident plane of refraction, central authorities' reflecting surface, side exit facet, bottom reflection face is curved surface, described incident plane of refraction is positioned at LED secondary lens bottom, described central reflecting surface is positioned at plane of incidence top, described side exit facet is a curved surface that connects end reflecting surface and central reflecting surface.
Central reflecting surface of the present invention, side exit facet are smooth surface.
Bottom reflection face of the present invention is smooth surface.
Incident plane of refraction of the present invention is a smooth surface.According to the needs of final effect, can be designed to convex surface or concave surface, also can be designed to Fresnel Lenses face.
Incident plane of refraction of the present invention, central reflecting surface, side exit facet, bottom reflection face are smooth surface, and the outline line of incident plane of refraction, central reflecting surface, side exit facet, bottom reflection face all can be characterized by following multinomial:
The height that wherein z is outline line, r is the distance of outline line with respect to axis,
c,
k,
a 1,
a 2,
a 3,
a 4... for the parameter that can be optimized according to design object.
The height z of outline line of the present invention and outline line are all the parameters that can be optimized according to design object with respect to the distance r of axis.
The target area of illumination of the present invention can be divided into wide-angle field of illumination according to the radial distance in distance L ED central illumination region, and (distance center field of illumination farthest, easily produce rainbow phenomena), (distance center field of illumination is not far in low-angle field of illumination, because refraction angle is relatively little, rainbow phenomena is not obvious) and frontlighting region (directly over central illumination region), described incident plane of refraction, central authorities' reflecting surface, side exit facet, the above-mentioned parameter design of bottom reflection face meets (following) wide-angle field of illumination, low-angle field of illumination, the brightness of illumination homogenising in frontlighting region.
Four illuminations that main optical surface is respectively used to produce different angles of the present invention, wide-angle illumination is mainly produced in total reflection mode by central reflecting surface; Low-angle illumination mainly is formed by the refraction of side exit facet, and frontlighting is mainly realized by the internal reflection of lens and the reflector plate that is assemblied in bottom LED light source; The uniform distribution that incident plane of refraction, central reflecting surface, side exit facet, bottom reflection face are realized each several part illumination by multinomial optimization is as above to realize the object of final All Ranges Uniform Illumination.Because wide-angle (diffusion part) illumination is made up of total reflection mode, so the embodiment of the present invention has good dispersion characteristics, can not form because angle is large dispersion aperture.
The present invention is simple for structure, is realizing under high diffusion ratio (angle spread) and low mixed light height condition, and the product light uniformity is high, and assembling is simple, saves the energy.
Brief description of the drawings
Fig. 1 is the round lens diffusion light beam schematic diagram of prior art.
Fig. 2 is the cross sectional representation of the embodiment of the present invention.
Fig. 3 is that embodiment of the present invention part LED light is launched and produced wide-angle illumination condition schematic diagram from side exit facet by the total reflection form of central reflecting surface.
Fig. 4 is that embodiment of the present invention part LED light directly penetrates side exit facet by incident plane of refraction and produces the low-angle illumination condition schematic diagram slightly less than state angle shown in Fig. 3, and this part LED light is by reflecting realization.
Fig. 5 is that embodiment of the present invention part LED light reflects in lens inner total reflection or by the reflector plate under LED light source by incident plane of refraction, and part LED light directly penetrates incident plane of refraction, central reflecting surface region, finally form frontlighting view, now light is that the mode of being mixed by refraction reflection realizes.
Fig. 6 is embodiment of the present invention beam angle distribution schematic diagram vertically.
Fig. 7 is available to the prior art application schematic diagram of auditor's reference, has shown that an example adopts the transmitted light colorimetric analysis schematic diagram of the round lens of existing techniques in realizing, and it has obvious rainbow line phenomenon.
Fig. 8 is available to the present embodiment application schematic diagram of auditor's reference, has shown the transmitted light colorimetric analysis schematic diagram of the present embodiment, and it is without rainbow line phenomenon.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention more clear, below in conjunction with concrete case study on implementation and with reference to accompanying drawing, the present invention is described in further details.
Fig. 2 has illustrated the basic structure of bis-refraction-reflection lens of LED described in the embodiment of the present invention, for the axial symmetry entity that adopts transparent material to make, bis-refraction-reflection lens package of this LED are containing incident plane of refraction 1, central authorities' reflecting surface 2, side exit facet 3 and bottom reflection face 4, described incident plane of refraction 1 is positioned at LED light source 5 tops and bis-refraction-reflection lens bottoms of LED and is curved surface, described central reflecting surface 2 is positioned at incident plane of refraction 1 top and is curved surface, described side exit facet 3 is curved surfaces that connect bottom reflection face 4 and central reflecting surface 2, bottom reflection face 4 and side exit facet 3 are curved surface.
Incident plane of refraction 1 of the present invention, central reflecting surface 2, side exit facet 3, bottom reflection face 4 are smooth surface, and the outline line of incident plane of refraction 1, central reflecting surface 2, side exit facet 3, bottom reflection face 4 all can be characterized by following multinomial:
The height (with respect to the height of the plane of refraction of incident shown in Fig. 21, bottom reflection face 4 extreme lower positions) that wherein z is outline line, r is the distance of outline line with respect to axis 7,
c,
k,
a 1,
a 2,
a 3,
a 4... for the parameter that can be optimized according to design object.
Fig. 3 has shown the part light condition schematic diagram that produces wide-angle illumination, from the light of LED light source 5 after the diffusion of incident plane of refraction 1, part light can form total reflection condition on central reflecting surface 2, and reflexed to side exit facet 3 by central reflecting surface 2, the output light via side exit facet 3 again, this part emergent ray is wide-angle, mainly form via the total reflection of central reflecting surface 2, the feature of reflection is that reflection angle is not because wavelength changes, thereby the large angle of flare of the wide-angle illuminating ray of this part is formed by total reflection, dispersion characteristics can be effectively controlled, it should be noted that the part light that central reflecting surface 2 reflects also can be sent and form wide-angle illumination through side exit facet 3 again by the reflection of bottom reflection face 4.Wide-angle illumination as above all will be used for illuminating those distance L ED light source 5 radial distances region far away.
Fig. 4 has shown the part light condition schematic diagram that produces less refraction angle illumination.A part light by LED light source 5 after incident plane of refraction 1 spreads, directly form divergent rays via side exit facet 3, the angle of this part light not as the part light angle of illustrating in Fig. 3 large, although this part illuminating ray is to form by two faces (incident plane of refraction 1 and side exit facet 3) refraction, because refraction angle is little, therefore the dispersion characteristics of this part illumination can be effectively controlled.The illuminating ray of this part is not mainly far region in order to illuminate those distance L ED light source 5 radial distances.
Fig. 5 has shown the part light condition schematic diagram that produces frontlighting, part by the total reflection light of central reflecting surface 2 in lens inside on other light faces (for example side exiting surface 3, bottom reflection face 4) form the situation of multiple total reflection, some light is finally reflected away and forms frontlighting with smaller angle by bottom reflection face 4, the light that part penetrates out from bottom reflection face 4 simultaneously also can reflect away at the reflector plate 6 of LED light source 5 bottoms via pad, forms the frontlighting of low-angle part.This part is mainly used in the illumination of LED light source 5 area just above.
By optimizing and revising of the structural parameters to lens and each Surface Parameters, the equilibrium that can realize three kinds of lighting system light energies as above distributes, thereby realizes Uniform Illumination.
Fig. 6 be an example according to the embodiment of the present invention light beam designing shown in Fig. 2 along the light dispersion angle distribution character in cylinder cross-sectional direction, in figure abscissa represent light beam along in the present embodiment (cylinder) cross-sectional direction with the angle (being light dispersion angle) of axis 7, ordinate is normalization Relative light intensity degree (%), can find out that divergence of beam angle is opened up to angles more than 70 degree on cross section.In order to analyze the colourity situation under so large dispersion angle condition, Fig. 7, Fig. 8 have illustrated the contrast of colourity effect of conventional lenses and the embodiment of the present invention, Fig. 7 is the colorimetric analysis that an example adopts the pantoscopic lens of traditional refraction mode (prior art shown in Fig. 1) design, can find out at the mid portion throwing light on because rainbow striped has appearred in the problem of dispersion; Fig. 8 is the colourity effect of the embodiment of the present invention, can see that the distribution of color in field of illumination is even, compares Fig. 7, and chromatic dispersion problem is under control, and rainbow striped is also effectively suppressed.
Claims (7)
1. bis-refraction-reflection lens of LED for downward back radiant, bis-refraction-reflection lens of described LED are the axial symmetry entity that adopts transparent material to make, it is characterized in that: bis-refraction-reflection lens of LED are by incident plane of refraction, central authorities' reflecting surface, side exit facet, bottom reflection face composition, described incident plane of refraction, central authorities' reflecting surface, side exit facet, bottom reflection face is curved surface, described incident plane of refraction is positioned at bis-refraction-reflection lens bottoms of LED, described central reflecting surface and side exit facet are connected to become upper surface, central authorities' reflecting surface is positioned at incident plane of refraction top, described side exit facet connects end reflecting surface and central reflecting surface.
2. bis-refraction-reflection lens of LED according to claim 1, is characterized in that: described central reflecting surface, side exit facet are smooth surface.
3. bis-refraction-reflection lens of LED according to claim 1 and 2, is characterized in that: described bottom reflection face is smooth surface.
4. bis-refraction-reflection lens of LED according to claim 1 and 2, is characterized in that: described incident plane of refraction is a smooth surface.
5. bis-refraction-reflection lens of LED according to claim 1, it is characterized in that: described incident plane of refraction, central reflecting surface, side exit facet, bottom reflection face are smooth surface, the outline line of incident plane of refraction, central reflecting surface, side exit facet, bottom reflection face characterizes by following multinomial:
The height that wherein z is outline line, r is the distance of outline line with respect to axis,
c,
k,
a 1,
a 2,
a 3,
a 4... for the parameter that can be optimized according to design object.
6. bis-refraction-reflection lens of LED according to claim 5, is characterized in that: the height z of described outline line and outline line are all the parameters that can be optimized according to design object with respect to the distance r of axis.
7. according to bis-the refraction-reflection type lens of LED described in claim 1,2,5,6 arbitrary claims, it is characterized in that: target illumination region is divided into wide-angle field of illumination, low-angle field of illumination, three, frontlighting region part according to the distance of distance L ED light source radial distance, and the brightness of illumination in wide-angle field of illumination, low-angle field of illumination, frontlighting region is even.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202369.0A CN103994396B (en) | 2014-05-14 | 2014-05-14 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202369.0A CN103994396B (en) | 2014-05-14 | 2014-05-14 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
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| CN103994396A true CN103994396A (en) | 2014-08-20 |
| CN103994396B CN103994396B (en) | 2017-07-11 |
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| CN201410202369.0A Expired - Fee Related CN103994396B (en) | 2014-05-14 | 2014-05-14 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296070A (en) * | 2014-08-28 | 2015-01-21 | 新烨光学(深圳)有限公司 | Novel wide-angle lens |
| CN106959554A (en) * | 2017-05-08 | 2017-07-18 | 胜蓝科技股份有限公司 | A kind of reflective astigmat, backlight module and liquid crystal display device |
| CN111552115A (en) * | 2020-05-11 | 2020-08-18 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
| CN112443813A (en) * | 2019-08-29 | 2021-03-05 | 株式会社小糸制作所 | Vehicle marker lamp |
| CN113534532A (en) * | 2020-04-22 | 2021-10-22 | 华为技术有限公司 | Lens, backlight module and terminal equipment |
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| CN204005733U (en) * | 2014-05-14 | 2014-12-10 | 郑睿韬 | Bis-refraction-reflection lens of LED for downward back radiant |
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| CN101093279A (en) * | 2005-02-08 | 2007-12-26 | 友达光电股份有限公司 | Dished lens and point source of light in back lighting module |
| JP5188077B2 (en) * | 2007-03-02 | 2013-04-24 | 株式会社光波 | Light direction changing element and planar light emitting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104296070A (en) * | 2014-08-28 | 2015-01-21 | 新烨光学(深圳)有限公司 | Novel wide-angle lens |
| CN106959554A (en) * | 2017-05-08 | 2017-07-18 | 胜蓝科技股份有限公司 | A kind of reflective astigmat, backlight module and liquid crystal display device |
| CN106959554B (en) * | 2017-05-08 | 2023-06-27 | 胜蓝科技股份有限公司 | Reflective astigmatic lens, backlight module and liquid crystal display device |
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| CN103994396B (en) | 2017-07-11 |
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