CN102374497A - Light guide plate and LED (light emitting diode) light source assembly - Google Patents
Light guide plate and LED (light emitting diode) light source assembly Download PDFInfo
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- CN102374497A CN102374497A CN2010102551759A CN201010255175A CN102374497A CN 102374497 A CN102374497 A CN 102374497A CN 2010102551759 A CN2010102551759 A CN 2010102551759A CN 201010255175 A CN201010255175 A CN 201010255175A CN 102374497 A CN102374497 A CN 102374497A
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- 239000000843 powder Substances 0.000 claims abstract description 117
- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 230000007423 decrease Effects 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 100
- 238000005286 illumination Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 14
- 241001025261 Neoraja caerulea Species 0.000 description 6
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- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229920005479 Lucite® Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910019990 cerium-doped yttrium aluminum garnet Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 230000000644 propagated effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The invention relates to the field of illumination, and provides a light guide plate and an LED (light emitting diode) light source assembly, wherein the light guide plate comprises a fluorescent powder layer, two light-emitting surfaces and a light entry surface, wherein the fluorescent powder layer is arranged at a central surface; the two light-emitting surfaces are opposite to the fluorescent powder layer; the light entry surface is positioned at the side surface of the fluorescent powder layer; and the refractive index at each position between the light-emitting surfaces and the fluorescent powder layer decreases as the increase of the distance from the each position to the fluorescent powder layer. According to the invention, the LED light source is arranged the side surface of the fluorescent powder layer, and the optical axis of the LED light source is positioned on the plane of the fluorescent powder layer; the light emitted by the LED light source enters the light guide plate, and is transmitted in an approximate cosine curve track to the fluorescent powder layer to excite the fluorescent powder to illuminate; and after the light illuminated by the fluorescent powder is mixed with the light emitted by the LED light source, the light of the required color is obtained, and the light of the required color is directly extracted from the two light-emitting surfaces so as to implement dual-surface illumination.
Description
Technical field
The invention belongs to lighting field, relate in particular to a kind of LGP and led light source assembly.
Background technology
Because light emitting diode (LED) has long, advantage such as energy consumption is low, startup is fast of life-span, the LED device has been widely used in fields such as signal lamp, auto lamp, large screen display and illumination.The most frequently used white light LEDs is to adopt the mode of blue-ray LED light source and phosphor combination to obtain white light at present.Typical white light LEDs is made up of blue-ray LED light source, phosphor powder layer and support, and phosphor powder layer is positioned at blue-ray LED light source top.
The working method of white light LEDs be generally the blue-ray LED light source from the phosphor powder layer back side excitated fluorescent powder luminous, the stimulated radiation light that fluorescent material produces and blue-ray LED light source send obtains white light after not mixed by the light of fluorescent material absorption.And at present, the led light source assembly is that single face is luminous.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LGP, is intended to solve the existing luminous problem of led light source assembly single face.
The embodiment of the invention is achieved in that a kind of LGP, and it comprises: the phosphor powder layer, two exiting surfaces relative with said phosphor powder layer and the incidence surface that is positioned at the side of said phosphor powder layer that are provided with at the median plane place; The refractive index of position everywhere between said exiting surface and the said phosphor powder layer is along with reducing with the increase of said phosphor powder layer distance.
Another purpose of the embodiment of the invention is to provide a kind of led light source assembly; Said led light source assembly comprise led light source and with the LGP of said led light source optical coupled, said LGP comprises: the phosphor powder layer, two exiting surfaces relative with said phosphor powder layer and the incidence surface that is positioned at the side of said phosphor powder layer that are provided with at the median plane place; The refractive index of position everywhere between said exiting surface and the said phosphor powder layer is along with reducing with the increase of said phosphor powder layer distance; Said led light source is arranged on the position of said incidence surface, and the optical axis of said led light source is positioned at the plane at said phosphor powder layer place.
The embodiment of the invention is provided with a phosphor powder layer in the median plane place of LGP, and two surfaces relative with phosphor powder layer are exiting surface; The refractive index of position everywhere between exiting surface and the phosphor powder layer is along with reducing with the increase of phosphor powder layer distance; Led light source is positioned at the side of phosphor powder layer, and makes the optical axis of led light source be positioned at the plane that phosphor powder layer belongs to; The light that led light source sends gets into LGP, and it is luminous to be transmitted to the phosphor powder layer excitated fluorescent powder with the track that is similar to cosine curve; Light that fluorescent material sends and the light that obtains required color after the light that led light source sends mixes, the light of required color directly extracts from two exiting surfaces of LGP, realizes double-side.
Description of drawings
Fig. 1 is the structural representation of the led light source assembly that provides of first embodiment of the invention;
Fig. 2 is the refractive index profile of LGP in the first embodiment of the invention;
Fig. 3 is the structural representation of the led light source assembly that provides of second embodiment of the invention;
Fig. 4 is the refractive index profile of LGP in the second embodiment of the invention;
Fig. 5 is the light path sketch map of light in LGP that led light source sends in the second embodiment of the invention.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is provided with a phosphor powder layer in the median plane place of LGP, and two surfaces relative with phosphor powder layer are exiting surface; The refractive index of position everywhere between exiting surface and the phosphor powder layer is along with reducing with the increase of phosphor powder layer distance; Led light source is positioned at the side of phosphor powder layer, and makes the optical axis of led light source be positioned at the plane that phosphor powder layer belongs to; The light that led light source sends gets into LGP, and it is luminous to be transmitted to the phosphor powder layer excitated fluorescent powder with the track that is similar to cosine curve; Light that fluorescent material sends and the light that obtains required color after the light that led light source sends mixes, the light of required color directly extracts from two exiting surfaces of LGP, realizes double-side.
The LGP that the embodiment of the invention provides comprises: the phosphor powder layer, two exiting surfaces relative with said phosphor powder layer and the incidence surface that is positioned at the side of said phosphor powder layer that are provided with at the median plane place; The refractive index of position everywhere between said exiting surface and the said phosphor powder layer is along with reducing with the increase of said phosphor powder layer distance.
The led light source assembly that the embodiment of the invention provides comprise led light source and with the LGP of said led light source optical coupled, said LGP comprises: the phosphor powder layer, two exiting surfaces relative with said phosphor powder layer and the incidence surface that is positioned at the side of said phosphor powder layer that are provided with at the median plane place; The refractive index of position everywhere between said exiting surface and the said phosphor powder layer is along with reducing with the increase of said phosphor powder layer distance; Said led light source is arranged on the position of said incidence surface, and the optical axis of said led light source is positioned at the plane at said phosphor powder layer place.
Below enumerating some embodiment is described in detail concrete realization of the present invention.
Embodiment one
As shown in Figure 1, the led light source assembly that the embodiment of the invention provides is a white light LED light source component.This white light LED light source component comprise led light source 100 and with the LGP 101 of these led light source 100 optical coupled.Led light source 100 is the ultraviolet leds light source, and its emission wavelength is 360nm.The median plane place of LGP 101 is provided with a phosphor powder layer 104, and this LGP 101 has two exiting surfaces 103 relative with phosphor powder layer 104 and the incidence surface 102 that is positioned at the side of phosphor powder layer.Led light source 100 is located at the position of incidence surface 102, and the optical axis of led light source 100 is positioned at the plane at phosphor powder layer 104 places.The refractive index of position everywhere between exiting surface 103 and the phosphor powder layer 104 is along with reducing with the increase of phosphor powder layer 104 distances.Phosphor powder layer 104 adopts the fluorescent material that is fit to ultraviolet excitation, and the area of phosphor powder layer 104 is identical with the area of the central cross-section of LGP 101.
Above-mentioned refractive index is successively decreased along with being staged with the increase of phosphor powder layer 104 distances.Particularly, LGP 101 is fitted by plural layers and is formed, and each layer film has a refractive index parameter; Plural layers are that the center is symmetrically distributed with phosphor powder layer 104, and have identical refractive index with the identical double-layer films of phosphor powder layer 104 vertical ranges; Being staged from the refractive index of each layer film between phosphor powder layer 104 to the exiting surface 103 successively decreases.
In the embodiment of the invention, LGP 101 is lamellar, and thickness is 10mm.LGP 101 is fitted successively by the first film 105, second film 106, the 3rd film 107, the 4th film 108, the 5th film 109 and the 6th film 110 and is formed, and phosphor powder layer 104 is located between the 3rd film 107 and the 4th film 108.The thickness of the first film 105 and the 6th film 110 is 1.5mm, and refractive index is 1.4; The thickness of second film 106 and the 5th film 109 is 2mm, and refractive index is 1.8; The thickness of the 3rd film 107 and the 4th film 108 is 1.5mm, and refractive index is 1.9.Fig. 2 shows the index distribution situation of LGP 101, and its index distribution is staged successively decreases, and its envelope is similar to the cosine curve shape.
The track of the light of the entering LGP 101 that led light source 100 sends approximate cosine curve in the effect lower edge of multilayer different refractivity film is propagated, and through phosphor powder layer 104 excitated fluorescent powders that are positioned at the median plane place are luminous.The light that fluorescent material sends mixes with the light that led light source 100 sends and obtains white light, and this white light directly extracts from two exiting surfaces 103 of LGP 101, realizes double-side.Simultaneously, avoided the absorption to white light of led light source 100 and encapsulating material, the light that has greatly improved the led light source assembly takes out efficient.In addition, the exciting light that led light source 100 sends is transmitted to apart from led light source 100 fluorescent material at a distance and need not to have improved the launching efficiency of led light source 100 through repeatedly reflection and scattering.
Certainly, for strengthening the light intensity of this led light source assembly, a plurality of led light sources 100 can be set at the incidence surface 102 of LGP 101.
The led light source assembly of this double-side also can be provided with the area of exiting surface 103 flexibly, prevents dazzle.As satisfying under the situation of brightness requirement, increase the area of exiting surface 103, to reduce dazzle.
Embodiment two
As shown in Figure 3, the led light source assembly that the embodiment of the invention provides is a white light LED light source component.This white light LED light source component comprise led light source 300 and with the LGP 301 of these led light source 300 optical coupled.Led light source 300 is the blue-ray LED light source, and its emission wavelength is 450nm.The median plane place of LGP 301 is provided with a phosphor powder layer 304, and this LGP 301 has two exiting surfaces 306 relative with phosphor powder layer 304 and the incidence surface 305 that is positioned at the side of phosphor powder layer 304.Led light source 100 is located at the position of incidence surface 305, and the optical axis of led light source 300 is positioned at the plane at phosphor powder layer 304 places.The refractive index of position everywhere between exiting surface 306 and the phosphor powder layer 304 is along with reducing with the increase of phosphor powder layer 304 distances.Phosphor powder layer 304 adopts and is fit to blue-light excited fluorescent material (like commercially available YAG:Ce yellow fluorescent powder), and this fluorescent material and led light source 300 couplings produce white light.The area of phosphor powder layer 304 is identical with the area of the central cross-section of LGP 301.
Particularly; Above-mentioned LGP 301 is made up of two-layer optical waveguide layer 302 and the phosphor powder layer 304 between two-layer optical waveguide layer 302; Two-layer optical waveguide layer 302 is that axial symmetry distributes with phosphor powder layer 304, and optical waveguide layer 302 inside index distribution everywhere satisfies following formula:
Wherein, d
1Thickness for optical waveguide layer 302; r
1Be the distance of optical waveguide layer 302 inner somewheres and phosphor powder layer 304,0≤r
1≤d
1n
11Be the refractive index at the median plane place of LGP 301,1.4≤n
11≤1.9; n
2Be the refractive index at exiting surface 306 places of LGP 301,1.2≤n
12＜n
1α
1Be the refractive index profile exponential parameter of LGP 301,1≤α
1≤8, n (r
1) represent apart from phosphor powder layer 304r
1The refractive index at place.The refractive index of hence one can see that optical waveguide layer 302 is along with reducing gradually with the increase of phosphor powder layer 304 distances, and is promptly higher near the refractive index of phosphor powder layer 304 in the optical waveguide layer 302, lower away from the refractive index of phosphor powder layer 304.
In the embodiment of the invention, LGP 301 is shaped to cuboid or cylinder by glass or lucite, the thickness d of optical waveguide layer 302
1Be 2.5mm, n
11=1.85, n
12=1.5, α
1=2.Correspondingly, the index distribution of optical waveguide layer 302 satisfies formula: n (r
1)=1.85 [1-0.1892 (r
1/ 2.5)
2], the index distribution of LGP 301 is approximate cosine curve shape, and is as shown in Figure 4.
The blue light that led light source 300 sends gets into LGP 301 from incidence surface 305 optical coupled, and at LGP 301 radially under the effect of graded index, it is luminous, as shown in Figure 5 directly to be transmitted to phosphor powder layer 304 excitated fluorescent powders with the track of approximate cosine curve.Light and blue light that blue-light excited fluorescent material sends obtain white light, and this white light directly extracts from two exiting surfaces 303 of LGP 301, realize double-side.Simultaneously, avoided the absorption to white light of led light source 300 and encapsulating material, the light that has greatly improved the led light source assembly takes out efficient.In addition, the excitation line that led light source 300 sends is transmitted to apart from led light source 300 fluorescent material at a distance and need not to have improved the launching efficiency of led light source 300 through repeatedly reflection and scattering.
In the embodiment of the invention, above-mentioned exiting surface 306 is processed into the uneven structure that has on the microcosmic, the light that helps further to improve this led light source assembly takes out efficient, and eliminates dazzle.
Embodiment three
As an alternative embodiment of the invention, on above-mentioned exiting surface 303, set up toroidal lens, make this led light source assembly become the curved surface light source of double-side.The refractive index of toroidal lens is between the minimum refractive index of the refractive index of ambient atmos and LGP.The probability that total reflection takes place at the interface of white light between LGP and toroidal lens and toroidal lens and ambient atmos reduces greatly, and the light that has greatly promoted this led light source assembly takes out efficient.
The embodiment of the invention is provided with a phosphor powder layer in the median plane place of LGP, and two surfaces relative with phosphor powder layer are exiting surface; The refractive index of position everywhere between exiting surface and the phosphor powder layer is along with reducing with the increase of phosphor powder layer distance; Led light source is positioned at the side of phosphor powder layer, and makes the optical axis of led light source be positioned at the plane that phosphor powder layer belongs to; The light that led light source sends gets into LGP, and it is luminous to be transmitted to the phosphor powder layer excitated fluorescent powder with the track that is similar to cosine curve; Light that fluorescent material sends and the light that obtains required color after the light that led light source sends mixes, the light of required color directly extracts from two exiting surfaces of LGP, realizes double-side.Simultaneously, in exiting surface the uneven structure on the microcosmic is set, the light that helps to improve the led light source assembly takes out efficient.In addition, the refractive index of LGP has alternation and two kinds of variation patterns of gradual change, be beneficial to product design, and the index distribution of gradual manner LGP satisfies following formula:
n(r)＝n
1[1-(1-n
2/n
1)(r/d)
a]，
Wherein, d is the half the of said light guide plate; R is the distance of interior somewhere of said LGP and said phosphor powder layer, 0≤r≤d; n
1Be the refractive index at the median plane place of said LGP, 1.4≤n
1≤1.9; n
2Be the refractive index at the exiting surface place of said LGP, 1.2≤n
2＜n
1α is the refractive index profile exponential parameter of said LGP, 1≤α≤8, the refractive index at the said phosphor powder layer r of n (r) expression distance place.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. LGP, it is characterized in that: said LGP comprises: the phosphor powder layer, two exiting surfaces relative with said phosphor powder layer and the incidence surface that is positioned at the side of said phosphor powder layer that are provided with at the median plane place; The refractive index of position everywhere between said exiting surface and the said phosphor powder layer is along with reducing with the increase of said phosphor powder layer distance.
2. LGP as claimed in claim 1 is characterized in that, said refractive index is staged and successively decreases.
3. LGP as claimed in claim 1 is characterized in that, the index distribution of said LGP satisfies following formula:
n(r)＝n
1[1-(1-n
2/n
1)(r/d)
a]，
Wherein, d is the half the of said light guide plate; R is the distance of interior somewhere of said LGP and said phosphor powder layer, 0≤r≤d; n
1Be the refractive index at the median plane place of said LGP, 1.4≤n
1≤1.9; n
2Be the refractive index at the exiting surface place of said LGP, 1.2≤n
2＜n
1α is the refractive index profile exponential parameter of said LGP, 1≤α≤8, the refractive index at the said phosphor powder layer r of n (r) expression distance place.
4. LGP as claimed in claim 1 is characterized in that, the area of said phosphor powder layer is identical with the area of the central cross-section of said LGP.
5. led light source assembly; Comprise led light source and with the LGP of said led light source optical coupled; It is characterized in that said LGP comprises: the phosphor powder layer, two exiting surfaces relative and the incidence surface that is positioned at the side of said phosphor powder layer that are provided with at the median plane place with said phosphor powder layer; The refractive index of position everywhere between said exiting surface and the said phosphor powder layer is along with reducing with the increase of said phosphor powder layer distance; Said led light source is arranged on the position of said incidence surface, and the optical axis of said led light source is positioned at the plane at said phosphor powder layer place.
6. led light source assembly as claimed in claim 5 is characterized in that, said refractive index is staged and successively decreases.
7. led light source assembly as claimed in claim 6 is characterized in that, said LGP is fitted by plural layers and formed, and each layer film has a refractive index parameter; Said plural layers are that the center is symmetrically distributed with said phosphor powder layer, and have identical refractive index with the identical double-layer films of said phosphor powder layer vertical range; Being staged from said phosphor powder layer refractive index of each layer film between the said exiting surface successively decreases.
8. led light source assembly as claimed in claim 5; It is characterized in that; Said LGP is made up of two-layer optical waveguide layer and the phosphor powder layer between two-layer optical waveguide layer; Said two-layer optical waveguide layer is that axial symmetry distributes with said phosphor powder layer, and said optical waveguide layer inside index distribution everywhere satisfies following formula:
Wherein, d
1Thickness for said optical waveguide layer; r
1Be the distance of somewhere and said phosphor powder layer in the said optical waveguide layer, 0≤r
1≤d
1n
11Be the refractive index at the median plane place of said LGP, 1.4≤n
11≤1.9; n
2Be the refractive index at the exiting surface place of said LGP, 1.2≤n
12＜n
1α
1Be the refractive index profile exponential parameter of said LGP, 1≤α
1≤8, n (r
1) the said phosphor powder layer r of expression distance
1The refractive index at place.
9. led light source assembly as claimed in claim 1 is characterized in that said exiting surface is provided with toroidal lens, and the refractive index of said toroidal lens is between the refractive index of the minimum refractive index of said LGP and ambient atmos.
10. led light source assembly as claimed in claim 1 is characterized in that, said exiting surface has the uneven structure on the microcosmic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102551759A CN102374497A (en) | 2010-08-17 | 2010-08-17 | Light guide plate and LED (light emitting diode) light source assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102551759A CN102374497A (en) | 2010-08-17 | 2010-08-17 | Light guide plate and LED (light emitting diode) light source assembly |
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|---|---|
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|---|---|---|---|
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Cited By (11)
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|---|---|---|---|---|
| CN103137839A (en) * | 2013-02-19 | 2013-06-05 | 东南大学 | Slice-type white light light-emitting diode (LED) packaging structure |
| CN103149625A (en) * | 2013-03-13 | 2013-06-12 | 青岛海信电器股份有限公司 | Light guide board, LED (Light-Emitting Diode) backlight module and electronic equipment |
| CN104007506A (en) * | 2014-06-17 | 2014-08-27 | 台州市伊悦尼塑模有限公司 | Technology method of light guide plate or light guide bar for daytime running light |
| CN104424712A (en) * | 2013-08-23 | 2015-03-18 | 鸿富锦精密工业(武汉)有限公司 | Vending machine |
| CN105393048A (en) * | 2013-08-12 | 2016-03-09 | 三菱电机株式会社 | Vehicle headlamp device and light guide element |
| CN106461191A (en) * | 2014-06-04 | 2017-02-22 | 旭硝子株式会社 | Glass plate for light-guide plate |
| US9798061B2 (en) | 2012-07-26 | 2017-10-24 | Young Lighting Technology Inc. | Hybrid light guide plate and display device |
| KR20180101697A (en) * | 2017-03-05 | 2018-09-13 | (주)매크로 이빈 | LED down light with soft light output |
| CN109595526A (en) * | 2017-10-03 | 2019-04-09 | 株式会社小糸制作所 | Lamps apparatus for vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20180101697A (en) * | 2017-03-05 | 2018-09-13 | (주)매크로 이빈 | LED down light with soft light output |
| KR101961764B1 (en) * | 2017-03-05 | 2019-03-25 | (주)매크로 이빈 | LED down light with soft light output |
| CN109595526A (en) * | 2017-10-03 | 2019-04-09 | 株式会社小糸制作所 | Lamps apparatus for vehicle |
| CN109595526B (en) * | 2017-10-03 | 2021-12-07 | 株式会社小糸制作所 | Vehicle lamp |
| WO2020135290A1 (en) * | 2018-12-26 | 2020-07-02 | 深圳市绎立锐光科技开发有限公司 | Illumination lamp and light source thereof |
| DE102022101928A1 (en) | 2022-01-27 | 2023-07-27 | Marelli Automotive Lighting Reutlingen (Germany) GmbH | Optical solid body made of a solid transparent material, light module with such a solid optical body and motor vehicle lighting device with such a light module |
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Application publication date: 20120314 |