CN103151443A - Total-reflection lateral light-emitting white-light light emitting diode (LED) packaging structure - Google Patents
Total-reflection lateral light-emitting white-light light emitting diode (LED) packaging structure Download PDFInfo
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- CN103151443A CN103151443A CN2013100532899A CN201310053289A CN103151443A CN 103151443 A CN103151443 A CN 103151443A CN 2013100532899 A CN2013100532899 A CN 2013100532899A CN 201310053289 A CN201310053289 A CN 201310053289A CN 103151443 A CN103151443 A CN 103151443A
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Abstract
The invention discloses a total-reflection lateral light-emitting white-light light emitting diode (LED) packaging structure, which comprises a transparent sheet, an internal cylindrical surface reflection mirror which is arranged along the circumferential direction of the transparent sheet, fluorescent powder, dispersion powder, an LED chip, a condensation reflector and an electrode, wherein the fluorescent powder and the dispersion powder are sealed in the transparent sheet, the LED chip and the condensation reflector are arranged on the transparent sheet, the electrode is connected with the LED chip, the condensation reflector is arranged on a horizontal side of the LED chip, an opening of the condensation reflector faces towards the LED chip, the LED chip is adjacent to the inner side surface of the opening of the condensation reflector, normal of the LED chip is parallel to the plane of the transparent sheet, and the internal cylindrical surface reflection mirror is vertical to the plane of the transparent sheet. Due to the adoption of the total-reflection lateral light-emitting white-light LED packaging structure, light scattering loss caused by the fluorescent powder layer can be reduced, the white light efficiency is increased, the photochromic performance can be adjusted by doping appropriate dispersion powder into the fluorescent powder, the distance between the fluorescent powder and the chip is also increased, the worsening of the performance of the fluorescent powder caused by the heat produced by the chip can be reduced, and the white light efficiency is further improved.
Description
Technical field
The invention belongs to the photoelectron technology field, relate to white light emitting diode (LED) encapsulating structure, especially a kind of full reflection side is to the lighting-out tpye White-light LED package structure.
Background technology
LED is the luminous semi-conductor electricity sub-element of a kind of energy, and its physical property is known, and is used widely in illumination and demonstration industry.
Common white light LEDs technology, be the blue light that uses LED chip to produce at present, excites to be coated on chip top or fluorescent material on every side, sends green glow, gold-tinted or ruddiness after fluorescent material is stimulated, and produces white light with the blue light collocation of LED chip.Also have in addition a kind of close white light LEDs technology with it, the ultraviolet light that it uses ultraviolet LED chip to produce excites to be coated on chip top or fluorescent material on every side, sends blue light, green glow or ruddiness, blends white light.US Patent No. 005998925A, US006069440A, US006600175A, US006614179A, US007592192A, US08227273A, US005847507A, US005959316A, US006163038A, US006299498B1, US006576930B2, US006812500B2, US007592192B2, US007750359B2, US005813753A, US006614179B1, US00329988B2, Chinese patent CN102593269A, CN1870309A, CN101702421B, CN101521257B, CN102169951A, CN101320773B, CN101771129A, CN102569558A, CN101432895A and CN102110681A, all used similar technology.Wherein US Patent No. 006614179B1, US00329988B2, Chinese patent CN101432895A and CN102110681A have used the side direction light technology, but its white light is still chip and is coated on that fluorescent material collocation on chip produces.
In above-mentioned white light LEDs technology, fluorescent material all directly is coated on chip top or is looped around around chip, photochromic, the light efficiency of gained white light and the concentration of fluorescent material and very large with magnitude relation.Be combined as example with the most frequently used blue chip and yellow fluorescent powder, white light is that the gold-tinted that is obtained by blue-light excited fluorescent material and the blue light that sees through phosphor powder layer form, the light that chip and fluorescent material send must see through the phosphor powder layer of high concentration, and phosphor powder layer can produce scattering and stop light, and causes very large light loss.The ratio of gold-tinted is higher, and the consumption of fluorescent material is also more, and the light loss that phosphor powder layer causes is larger.For the positive white light LEDs of about 6000K, finally see through the ratio of emergent light of phosphor powder layer lower than 50%.And for the warm white LED of about 2800K, because the fluorescent material amount of using is more, finally see through the ratio only approximately 30% of the emergent light of phosphor powder layer.
Loss when reducing light by phosphor powder layer, Optics Express periodical the 17th the 9th phase of volume of April in 2009 reported use blue light logical-the gold-tinted reflection filter is with the method for the efficient that improves white light LEDs.But in the method, the light that chip and fluorescent material send still needs to see through the phosphor powder layer of high concentration, can not significantly improve the outgoing ratio of light.
In sum, there is serious problem in the white-light LED encapsulation technology of existing use fluorescent material technology, namely due to the phosphor powder layer scattering and a large amount of light losses former thereby that cause such as stop, if can address this problem, can increase substantially the light outgoing efficient of white light LEDs.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of white light encapsulating structure that can significantly reduce the loss of light in communication process, improve the LED light efficiency.
technical scheme: full reflection side of the present invention is to the light-emitting type White-light LED package structure, comprise transparent sheet, along the circumferential inner cylinder speculum that arranges of transparent sheet, be encapsulated in fluorescent material and spread powder in transparent sheet, and be arranged on LED chip and investigation on several focus reflectors on transparent sheet, the electrode that is connected with LED chip, investigation on several focus reflectors is positioned at LED chip level one side, the opening of investigation on several focus reflectors is towards LED chip, the opening inner surface of LED chip and investigation on several focus reflectors is adjacent, the normal direction of LED chip and the plane parallel of transparent sheet, the inner cylinder speculum is vertical with the plane of transparent sheet, transparent sheet is made more than or equal to 1.35 transparent material by refractive index.
In the present invention, investigation on several focus reflectors is parabola, cambered surface or trapezoidal tapers.
In the present invention, LED chip and investigation on several focus reflectors are encapsulated in transparent sheet inside.
In the present invention, LED chip and investigation on several focus reflectors are arranged on the circumferential edge of transparent sheet, and the opening of investigation on several focus reflectors is towards transparent sheet.
In the present invention, the upside of transparent sheet or downside are provided with a bottom reflection mirror, to realize one-sided bright dipping.
In the present invention, the upside of transparent sheet or downside are provided with transparent convex lens that adopt refractive index to make more than or equal to 1.35 transparent material.
In the present invention, the upside of transparent sheet and downside are respectively arranged with transparent convex lens that adopt refractive index to make more than or equal to 1.35 transparent material.
In the present invention, what LED chip sent is blue light or ultraviolet light.
In the present invention, the fluorescent material in transparent sheet and the weight ratio of transparent material are between 0.001:1 to 0.1:1.
In the present invention, the thickness of transparent sheet is no more than 5mm.
The present invention has designed a transparent sheet that contains fluorescent material or fluorescent material and spread powder mixture, and the circumferential edge of transparent sheet is provided with the inner cylinder speculum, and blue light or ultraviolet leds chip and investigation on several focus reflectors are arranged on inside or the circumferential edge of transparent sheet.The light that LED chip sends is injected transparent sheet under the effect of investigation on several focus reflectors.Because the refractive index ratio air of transparent sheet material is large, the light of injecting transparent sheet is limited in propagating in transparent sheet because total reflection occurs.When light is propagated in transparent sheet, excitated fluorescent powder is luminous or be diffused the powder scattering, and the light that fluorescent material sends and the light that is scattered form white light.White light is from two surperficial outgoing of transparent sheet.If a surface at transparent sheet arranges speculum, light can be from the single face outgoing.With respect to LED chip, white light is derived from side direction.On the transparent sheet surface, convex lens are set, can improve light outgoing efficient.
Beneficial effect: the present invention compared with prior art has the following advantages:
The below is combined as example with blue chip and yellow fluorescent powder, and first benefit of the present invention is described.The blue light of propagating in transparent sheet is before running into fluorescent material, and be limited in can't outgoing in transparent sheet due to the reflection of all reflective light and inner cylinder speculum.When blue light runs into fluorescent powder grain, the excitated fluorescent powder Yellow light-emitting low temperature, because the light emission direction of fluorescent material is random, so the part gold-tinted can be from the surperficial outgoing of transparent sheet, directly the gold-tinted of outgoing through can outgoing after Multiple Scattering yet.In the present invention, fluorescent material sends only derives from the surface of transparent sheet, and with respect to LED chip, white light is derived from side direction.Reduce the concentration of fluorescent material, the thickness of attenuate transparent sheet can make the scattering loss of the fluorescent material that light is subject to before outgoing reduce, and therefore white light efficient also get a promotion.And because the propagation of blue light is limited in transparent sheet, be no matter the concentration that reduces fluorescent material, or the thickness of attenuate transparent sheet can not increase the outgoing ratio of blue light, namely can not change the photochromic of white light LEDs.Therefore, first benefit of the present invention is: do not change white light LEDs photochromic in, can reduce the light scattering loss that phosphor powder layer causes, promote white light efficient.
Second benefit of the present invention is that the Photochromic Properties of white light LEDs can mix appropriate spread powder and regulate in fluorescent material.Be combined as example with blue chip and yellow fluorescent powder, if do not mix spread powder, the light of outgoing will be mainly gold-tinted, the blue light that is scattered out by fluorescent powder grain on a small quantity in addition, and colour temperature is lower.After adding spread powder, can improve the ratio of blue light outgoing.The incorporation of spread powder is more, and the blue light ratio that is scattered out is higher, and the colour temperature of white light LEDs is also higher.
Another benefit of the present invention is the distance that has increased fluorescent material and chip, has reduced the fluorescent material performance degradation that heat that chip produces causes, and also makes the white light efficient further to improve.
Description of drawings
Fig. 1 a, Fig. 1 b are respectively according to the side-looking of the white light LEDs of embodiments of the invention 1 and front elevational schematic.
Fig. 2 is the schematic side view according to the white light LEDs of embodiments of the invention 2.
Fig. 3 a, Fig. 3 b are respectively according to the side-looking of the white light LEDs of embodiments of the invention 3 and front elevational schematic.
Have in figure: 1.LED chip, 2. inner cylinder speculum, 3. fluorescent material, 4. spread powder, 5. transparent sheet, 6. investigation on several focus reflectors, 7. electrode, 8. shell, 9. transparent convex lens, 10. bottom reflection mirror.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical solution of the present invention is done further illustrating.
Fig. 1 a, Fig. 1 b are respectively according to the side-looking of the white light LEDs of embodiments of the invention 1 and front elevational schematic.As shown in the figure, at first selecting metal, glass or plastics etc. is sheathing material, produces an annular flake, and the thickness suggestion of annular flake is no more than 5mm.Inner cylinder at annular flake arranges inner cylinder speculum 2.Investigation on several focus reflectors 6 is arranged on the edge of inner cylinder speculum, and opening is inside, and blue light or ultraviolet leds chip 1 are arranged on opening one side of investigation on several focus reflectors 6.Investigation on several focus reflectors 6 can be the shapes such as trapezoidal tapers, parabola, cambered surface.
This annular flake is placed on a smooth substrate, consists of a concave surface, the refractive index that then will contain fluorescent material 3 and spread powder 4 is filled in this concave surface more than or equal to 1.35 transparent material.Spread powder 4 refers to utilize refraction or reflex to change the powder of optical propagation direction, the powder of making such as silicon dioxide, calcium carbonate, barium sulfate, organic siliconresin, acrylic resin or polymethyl methacrylate (PMMA) etc.Transparent material can use silicon rubber (refractive index n ≈ 1.41), silicones (refractive index n ≈ 1.54) or epoxy resin (refractive index n ≈ 1.52) etc.Transparent material removes smooth substrate after solidifying, and can obtain the transparent sheet 5 in the present embodiment.
In the time of after applying voltage on electrode 7, LED chip 1 is understood driven and is sent blue light or ultraviolet light.The light that LED chip 1 sends after investigation on several focus reflectors is assembled, horizontal transmission in transparent sheet 5.Much larger than air, inject the light of transparent sheet because total reflection occurs due to the refractive index of transparent sheet material, before running into fluorescent material 3 or spread powder 4, be limited in propagating in transparent sheet always.The blue light or the ultraviolet light that are transmitted to the circumferential edge of transparent sheet 5 can be reflected back in transparent sheet 5, continue excitated fluorescent powder 3 luminous or be diffused powder 4 scatterings.The light of the light that fluorescent material 3 sends and spread powder 4 scatterings is mixed into white light.
As a preferred embodiment of the present embodiment, be provided with convex lens 9 in the above and below of transparent sheet 5, the height of convex lens is controlled in the scope of not destroying total reflection condition.Convex lens can use the material identical with transparent sheet 5 to make, after solidifying and transparent sheet 5 become one.These convex lens can improve the outgoing ratio of light a step.In this preferred embodiment, also can only convex lens 9 be set above or below transparent sheet 5, the height of convex lens is controlled in the scope of not destroying total reflection condition.
If the use blue-light LED chip, the colour temperature of gained white light is relevant with the incorporation of spread powder 4.The incorporation of spread powder 4 is more, and the blue light of scattering is also more, thereby the final white light colour temperature that forms is just higher.
In the present embodiment, white light is to derive from two surfaces of transparent sheet 5, is that lateral guide goes out with respect to LED chip 1.Concentration by reducing fluorescent material (weight ratio of suggestion fluorescent material and transparent material is between 0.001:1 to 0.1:1), the thickness of attenuate transparent sheet 5 can make the scattering loss of the fluorescent material that light is subject to before outgoing reduce, raising white light efficient.
Fig. 2 is the schematic side view according to the white light LEDs of embodiments of the invention 2.In this embodiment, LED chip 1, inner cylinder speculum 2, fluorescent material 3, spread powder 4, transparent sheet 5, investigation on several focus reflectors 6 and transparent convex lens 9 are equal identical with embodiment 1, difference is to be provided with bottom reflection mirror 10 on a surface of transparent sheet 5, to realize the one-sided outgoing of white light.
In embodiment 2, investigation on several focus reflectors 6 can be the shapes such as trapezoidal tapers, parabola, cambered surface.
Fig. 3 a, Fig. 3 b are respectively according to the side-looking of the white light LEDs of embodiments of the invention 3 and front elevational schematic.In this embodiment, LED chip 1, inner cylinder speculum 2, fluorescent material 3, spread powder 4, transparent sheet 5, investigation on several focus reflectors 6, transparent convex lens 9 and bottom reflection mirror 10 are all identical with embodiment 2.Difference is the middle position that two investigation on several focus reflectors 6 are arranged on transparent sheet 5 dorsad, and electrode 7 is drawn from the bottom, and namely LED chip 1 and investigation on several focus reflectors 6 are encapsulated in transparent sheet 5 inside.
In the time of after applying voltage on electrode 7, LED chip 1 is understood driven and is sent blue light or ultraviolet light.Under the effect of investigation on several focus reflectors 6, the light that LED chip 1 sends horizontal transmission in transparent sheet 5.Light excitated fluorescent powder 3 in communication process is luminous or be diffused powder 4 scatterings.The blue light or the ultraviolet light that are transmitted to the circumferential edge of transparent sheet 5 can be reflected back in transparent sheet 5, continue excitated fluorescent powder 3 luminous or be diffused powder 4 scatterings.White light is comprised of the fluorescent material light that sends and the light that is scattered.If the use blue-light LED chip, the incorporation of spread powder 4 is more, and the colour temperature of white light is just higher.In the present embodiment, the white light speck approaches circular, and is positioned at the central area, and photochromic uniformity is better.
In embodiment 3, investigation on several focus reflectors 6 can be the shapes such as trapezoidal tapers, parabola, cambered surface.
In sum, the present invention has designed a transparent sheet that contains fluorescent material or fluorescent material and spread powder mixture, and the circumferential edge of transparent sheet is provided with the inner cylinder speculum.Blue light or ultraviolet leds chip are arranged on opening one side of investigation on several focus reflectors.Investigation on several focus reflectors and LED chip are encapsulated in inside or the circumferential edge of transparent sheet, its opening towards transparent sheet and with the horizontal direction parallel of transparent sheet.LED chip light is limited in horizontal transmission in transparent sheet because total reflection occurs.Blue light or ultraviolet excitation light-emitting phosphor or be diffused the powder scattering, the light that fluorescent material sends and scattered light are from two surperficial outgoing of transparent sheet.If a surface at transparent sheet arranges speculum, light can be from the single face outgoing.The light that fluorescent material sends is derived from the surface of transparent sheet, is that lateral guide goes out with respect to LED chip.By the concentration that reduces fluorescent material, the thickness of attenuate transparent sheet, can reduce the scattering loss of the fluorescent material that light is subject to before outgoing, thereby increase substantially white light efficient.Transparent convex lens are set above transparent sheet, can further improve light extraction efficiency.
The present invention can also extend the white-light LED structure pattern that obtains other.The shape of white light LEDs is not limited to circle, and the quantity of LED chip and mounting means also are not limited to the scope of previous embodiment, and the derivation of blue light also can adopt modes such as changing lens height to realize.
By the description of above specific embodiment, feature of the present invention and essence can be described more clearly.But above-mentioned concrete form of implementation is not construed as limiting scope of the present invention.And the scope of protection of present invention also is included in the interior various changes of claim scope and the replacement of equivalent feature.
Claims (10)
1. a full reflection side is to the light-emitting type White-light LED package structure, it is characterized in that, this encapsulating structure comprises transparent sheet (5), along the circumferential inner cylinder speculum (2) that arranges of described transparent sheet (5), be encapsulated in fluorescent material (3) and spread powder (4) in described transparent sheet (5), and be arranged on LED chip (1) and investigation on several focus reflectors (6) on transparent sheet (5), the electrode (7) that is connected with described LED chip (1), described investigation on several focus reflectors (6) is positioned at LED chip (1) level one side, the opening of investigation on several focus reflectors (6) is towards LED chip (1), LED chip (1) is adjacent with the opening inner surface of investigation on several focus reflectors (6), the plane parallel of the normal direction of LED chip (1) and transparent sheet (5), inner cylinder speculum (2) is vertical with the plane of transparent sheet (5), described transparent sheet (5) is made more than or equal to 1.35 transparent material by refractive index.
2. full reflection side according to claim 1 to the light-emitting type White-light LED package structure, is characterized in that, described investigation on several focus reflectors (6) is parabola, cambered surface or trapezoidal tapers.
3. full reflection side according to claim 1 to the light-emitting type White-light LED package structure, is characterized in that, described LED chip (1) and investigation on several focus reflectors (6) are encapsulated in transparent sheet (5) inside.
4. full reflection side according to claim 1 is to the light-emitting type White-light LED package structure, it is characterized in that, described LED chip (1) and investigation on several focus reflectors (6) are arranged on the circumferential edge of transparent sheet (5), and the opening of investigation on several focus reflectors (6) is towards transparent sheet (5).
5. the described full reflection side of arbitrary claim of according to claim 1 to 4 to the light-emitting type White-light LED package structure, is characterized in that, the upside of described transparent sheet (5) or downside are provided with a bottom reflection mirror (10), to realize one-sided bright dipping.
6. the described full reflection side of arbitrary claim of according to claim 1 to 4 is to the light-emitting type White-light LED package structure, it is characterized in that, the upside of described transparent sheet (5) or downside are provided with transparent convex lens (9) that adopt refractive index to make more than or equal to 1.35 transparent material.
7. the described full reflection side of arbitrary claim of according to claim 1 to 4 is to the light-emitting type White-light LED package structure, it is characterized in that, the upside of described transparent sheet (5) and downside are respectively arranged with transparent convex lens (9) that adopt refractive index to make more than or equal to 1.35 transparent material.
8. the described a kind of full reflection side of arbitrary claim of according to claim 1 to 4 to the light-emitting type White-light LED package structure, is characterized in that, what described LED chip (1) sent is blue light or ultraviolet light.
9. the described a kind of full reflection side of arbitrary claim of according to claim 1 to 4 to the light-emitting type White-light LED package structure, is characterized in that, the fluorescent material (3) in described transparent sheet (5) and the weight ratio of transparent material are between 0.001:1 to 0.1:1.
10. the described a kind of full reflection side of arbitrary claim of according to claim 1 to 4 to the light-emitting type White-light LED package structure, is characterized in that, the thickness of described transparent sheet (5) is no more than 5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310053289.9A CN103151443B (en) | 2013-02-19 | 2013-02-19 | Full reflection side is to light-emitting type White-light LED package structure |
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| CN201310053289.9A CN103151443B (en) | 2013-02-19 | 2013-02-19 | Full reflection side is to light-emitting type White-light LED package structure |
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| CN103151443B CN103151443B (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105864683A (en) * | 2015-01-22 | 2016-08-17 | 青岛海信电器股份有限公司 | Light source assembly, backlight module and display device |
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| US20070164300A1 (en) * | 2004-03-05 | 2007-07-19 | Konica Minolta Holdings, Inc. | White light emitting diode (white led) and method of manufacturing white led |
| CN102434794A (en) * | 2011-10-06 | 2012-05-02 | 广东华燚光电科技有限公司 | White-light light emitting diode (LED) lamp with large color-rendering index and manufacturing method thereof |
| CN102478157A (en) * | 2010-11-24 | 2012-05-30 | 海洋王照明科技股份有限公司 | Tubular LED (Light-Emitting Diode) light source |
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- 2013-02-19 CN CN201310053289.9A patent/CN103151443B/en not_active Expired - Fee Related
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| US20070164300A1 (en) * | 2004-03-05 | 2007-07-19 | Konica Minolta Holdings, Inc. | White light emitting diode (white led) and method of manufacturing white led |
| CN2862099Y (en) * | 2005-12-21 | 2007-01-24 | 上海铂美自动化有限公司 | Ultra-thin light conducting LED back light source apparatus on electric appliances |
| CN102478157A (en) * | 2010-11-24 | 2012-05-30 | 海洋王照明科技股份有限公司 | Tubular LED (Light-Emitting Diode) light source |
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