CN105762262A - Glare reduction blue light prevention LED optical structure capable of increasing light extraction efficiency - Google Patents
Glare reduction blue light prevention LED optical structure capable of increasing light extraction efficiency Download PDFInfo
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- CN105762262A CN105762262A CN201610259795.7A CN201610259795A CN105762262A CN 105762262 A CN105762262 A CN 105762262A CN 201610259795 A CN201610259795 A CN 201610259795A CN 105762262 A CN105762262 A CN 105762262A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Electroluminescent Light Sources (AREA)
- Led Device Packages (AREA)
Abstract
The invention discloses a glare reduction blue light prevention LED optical structure capable of increasing light extraction efficiency. The structure comprises a LED light source, a flexible optical transition layer and a lens. By using the LED light source, blue light emitted by an InGaN chip is used to excite a Ce: YAG yellow fluorescent powder; and then yellow light generated by the blue light and the fluorescent powder is used to carry out mixing so as to acquire white light. The flexible optical transition layer is a flexible polysiloxane gel and is preassembled in a pedestal light source chamber of the lens. When the LED light source and the lens are connected together, a gap between the light source and the lens is fully filled because of extrusion of the light source. The flexible optical transition layer can reduce total reflection losses generated when light enters into an optically thinner medium from an optically denser medium and reflection losses of an optical interface and the light extraction efficiency is increased. Compared to a technology of reducing the blue light through pasting a filtering film, by using the structure of the invention, optical efficiency is high; light is soft; light spots are uniform; color rendering performance is good; the technology is simple and cost is low.
Description
Technical field
The present invention relates to illumination optical, Display Technique field, refer in particular to a kind of can improve light extraction efficiency dazzle anti-blue light optical texture drops.
Background technology
Due to the advantage that LED has the long-life, volume is little, light efficiency is high, energy-conservation, good reliability, the conventional light source such as easily controllable hardly match, it is applied in the every aspect of people's lives such as light fixture, TV, computer display screen, smart mobile phone, panel computer gradually, and keeps the situation developed rapidly.But, along with the continuous lifting of LED light effect, its brightness also improves constantly, and power rises to tens of watts of levels from milliwatt level, and the photo bio safety thus brought increasingly is subject to people's attention.Containing substantial amounts of high energy shortwave blue light in the light that these products (especially LED and display screen) send.The research such as Noell in 1966 finds that the irradiation of blue light can cause the damage of retina cell, causes that visual deterioration is even lost.Yan Shi photomedicine circle it turned out the blue light contamination vision to the mankind and can produce serious influence in recent decades.Therefore, the radiation being prevented effectively from excessive blue light is most important to protection vision.
Additionally, the illuminating product of early stage often puts undue emphasis on energy-saving effect, seek higher light extraction efficiency, and ignore the light impact on people's quality of the life.Owing to LED light source power density is high, light source area is little, it is easy to produce dazzling direct glare, causes the visual discomfort of people, this not only can affect space depending on seeing condition, still result in visual deterioration and the unhappy key factor of psychology.At present, it is common practice to use the diffuser that frosted processes so that the light ratio sent is milder.But this way is that light efficiency is relatively low to sacrifice a part of light intensity for cost.Therefore, find and suitable drop dazzle anti-blue light optical texture, for child, long-term worker under indoor and outdoor strong light environment, have cataract and the working clan of the patient of maculopathy, student race and life-time service computer, all have and be of great significance.
For the injury preventing blue light from human eye being caused, people generally adopt two kinds of methods, and one is add one layer of filter coating in exiting surface part, absorbs the excessive blue light that light source sends, and two is the glasses by wearing anti-blue light.The common shortcoming of both approaches is, one is owing to the blue light of significant proportion is absorbed, cause really arriving amphiblestroid blue light ratio on the low side, thus reducing color rendering index, cause obvious cross-color, the color sense lightsensitivity that if things go on like this can cause optic nerve reduces, and has the risk causing color weakness or even achromatopsia.Two is whether filter coating or anti-blue light glasses, all overall luminous flux is caused a degree of decay, causes the light extraction efficiency of system to reduce.Moreover, this type of filter coating and anti-blue light glasses are relatively low to the selectivity transmitance of long wave visible ray, it is easy to cause and look thing and chromatic discrimination power decline.The consistent means that present stage takes are evaporation multi-layered antireflection coatings, but limited efficiency, technique is loaded down with trivial details.And mostly existing anti-blue light filter coating or anti-blue light glasses are that in resin base material the organic coloring agent such as flavochrome are contaminated on doping or surface, utilize the neutralizations principle of optical color to reach certain blue light neutralization or filter effect.But, more weak with organic dye weatherability, through light source long-term irradiation meeting weather stain, it is impossible to durable in use.
In existing lighting engineering (Fig. 2), between light source and optics, there is a layer of air wall.Protection and sealing function is played owing to often adding one layer of silica gel when LED encapsulates on lamp bead surface; its refractive index is about 1.56; and the refractive index of air is 1; light is when being entered optically thinner medium by optically denser medium; can be totally reflected more than the light of the angle of total reflection; all can cause reflection loss at each optical interface simultaneously, cause that the optical efficiency of system reduces.How to take cost-effective technological means, reduce this partially reflective loss, for improving and improving illuminating effect, there is obvious realistic meaning.
Summary of the invention
In view of this, the present invention is directed to the deficiencies in the prior art, it is desirable to provide a kind of when improving light extraction efficiency, effectively reduce dazzle and the LED light structure preventing excessive blue light from human eye being damaged.
For achieving the above object, the technical solution adopted in the present invention is: a kind of improve light extraction efficiency dazzle anti-blue light LED light structure drops, including LED light source, flexible optical transition zone and lens, described LED light source is the blue-light excited Ce:YAG yellow fluorescent powder utilizing InGaN chip to launch, and then gold-tinted produced by blue light and fluorescent material carries out being obtained by mixing white light again；Described flexible optical transition zone is flexible organopolysiloxane gel, is contained in the base light-source chamber of lens in advance, can fill the space between full light source and lens when LED light source and lens link together due to the extruding of light source.Flexible optical transition zone can reduce total reflection loss and the reflection loss of optical interface that light causes when being entered optically thinner medium by optically denser medium, improves light extraction efficiency.
Further, described organopolysiloxane gel optical transition layer mixes the blue-light absorbers being equivalent to organopolysiloxane gel interpolation quality 0.1%-0.3%.
Further, the refractive index of described organopolysiloxane gel is between 1.5-1.6.
Further, the light transmittance of described organopolysiloxane gel is more than 95%.
Further, described organopolysiloxane gel also includes brightener and light diffusing agent.
Further, described blue-light absorbers can select available blue-light absorbers on market, for instance substituted-phenyl azobenzene compound, and concrete can be 1-aryl-3-alkyl-4-vinyl benzene azo group-5-hydroxypyrazoles；Having selected the Metal Substrate derivatives of porphyrin being coated with by surfactant in a preferred embodiment of the invention, wherein surfactant is 1～10:1 with the mass ratio of Metal Substrate derivatives of porphyrin.
Further, described surfactant is dodecylbenzene sodium sulfonate.
Further, the optical surface of described lens is covered with the scute structure of difformity and size, and described scute structure can be one or more in tetragon, pentagon or hexagon.LED light source wavefront division is become numerous pictures by the scute structure of optical surface, thus greatly promoting the light-emitting area of human eye perception, reduces dazzle.
What the employing present invention brought has the beneficial effect that, while reducing excessive blue light, not only will not cause the reduction of light extraction efficiency, light extraction efficiency can be made on the contrary further to be promoted, be maintained with enough color rendering propertiess；By adding layer of surface activating agent on blue-light absorbers surface, improve and improve the weatherability of blue-light absorbers；Designed by the scute of lens optical surfaces, reduce the dazzle of light fixture or optical system.Compared to the technology realizing reducing blue light by pasting filter coating, raising light extraction efficiency provided by the invention to drop dazzle anti-blue light LED light feature optical efficiency high, light is soft, and hot spot is uniform, and color rendering properties is good, and technique is simply, with low cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the overall structure schematic diagram dropping dazzle anti-blue light LED light structure detailed description of the invention improving light extraction efficiency of the present invention；
Fig. 2 is LED light structural representation of the prior art；
Fig. 3 is optical surface is the structural representation of lens detailed description of the invention of scute；
Fig. 4 is the spectral distribution curve of LED light structure of the prior art；
Fig. 5 is the spectral distribution curve dropping dazzle anti-blue light LED light structure improving light extraction efficiency of the present invention.
Fig. 6 is the light path schematic diagram dropping dazzle anti-blue light LED light structure improving light extraction efficiency of the present invention.
Accompanying drawing illustrates: 1.LED light source；2. flexible optical transition zone；3. lens；4. surfactant；5 Metal Substrate derivatives of porphyrin.
Detailed description of the invention
For further appreciating that inventive feature, technological means and the specific purposes reached, function, resolve the advantages and spirit of the present invention, by the present invention will be further explained with detailed description of the invention below in conjunction with accompanying drawing.
The Basic Design theory of the present invention is as follows: determine suitable light-configuration mode according to the applied environment of optical texture, and is the lens of scute by optical simulation software according to the lens sizes of regulation, rising angle, illumination and uniformity design optical surface.Being designed by scute structure 6, LED light source 1 wavefront division becomes hundreds of picture, the light-emitting area of significant increase human eye perception, thus reducing dazzle.Scute can take many forms, tetragon, and hexagon all allows for.During design, the medium between light source 1 and lens 3 is preset as the organopolysiloxane gel of refractive index 1.56.The material of lens is PMMA or PC, and design result is as shown in Figure 1.Lighting calculation software analysis is adopted thus to plant the light fixture of optical texture formation type unified glare value (UGR) in actual application environment, changing the size of scute (6), relief height and shape, whether test design result meets the requirement of GB50034-2013 " standard for lighting design of buildings ".Lens are made according to design result.The lens made and design object are analyzed and suitably revise, to guarantee that actual effect is consistent with goal-selling.
Weigh 99.8g for making the organopolysiloxane gel of optical transition layer 2, add the 0.2g Metal Substrate derivatives of porphyrin 5 being coated with by dodecylbenzene sodium sulfonate, wherein contain 0.18g dodecylbenzene sodium sulfonate, 0.02g Metal Substrate derivatives of porphyrin, make the Metal Substrate derivatives of porphyrin 5 being coated with by dodecylbenzene sodium sulfonate be dispersed in organopolysiloxane gel by magnetic stirring apparatus, and it is stand-by to carry out degassed process with industry vacuum pump.
Take the mixture produced by approach described above in right amount, be filled in the light-source chamber bottom lens.The loading of soft silicone gel there to be a small amount of spilling to be advisable when LED light source and lens combine, and overflowing quality is add quality 1%～20%.Testing the spectral distribution after above process by the quick photochromic electricity integrated test system of LED, test result is shown in Fig. 4.As can be seen from Figure 4, compared with the test result (Fig. 3) before unprocessed, the intensity of blue light and ratio obtain certain reduction.
Include but not limited to the polysiloxanes of acrylate ended and the polysiloxanes of methacrylate end-blocking suitable in the organic polyorganosiloxane gel of the present invention, wherein said polysiloxanes contains appropriate aromatic portion to make the refractive index of polysiloxanes at least above 1.5.Preferably, described each polysiloxane unit mean molecule quantity is approximately between 1000-10000.And the molecular weight of polysiloxanes is approximately greater than 1000, but is no greater than 300000.
In existing lighting engineering (Fig. 2), owing to the air space between LED light source and lens is not done suitable process, the reflection loss with optical interface is lost in total reflection during due to light from optically denser medium entrance optically thinner medium, finally can only obtain the luminous flux of about 88% in the total light flux that luminescence chip sends.In the present invention (Fig. 6), owing to the addition of flexible optical transition zone 2 between LED light source (1) and lens 3, although the blue-light absorbers in flexible optical transition zone 2 can cause a little loss of luminous flux, but owing to decreasing the reflection loss at optical interface place, the luminous flux of 96% in the total light flux that luminescence chip sends therefore about can be obtained.Embodiment described above only have expressed the some embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as limitation of the scope of the invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, any amendment of making, equivalent replacement, improvement, deformation etc., it is all contained within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with claims.
Claims (10)
1. one kind improve light extraction efficiency dazzle anti-blue light LED light structure drops, it is characterized in that, including LED light source (1), flexible optical transition zone (2) and lens (3), described LED light source (1) utilizes the blue-light excited Ce:YAG yellow fluorescent powder that InGaN chip is launched, and then gold-tinted produced by blue light and fluorescent material carries out being obtained by mixing white light again；Described flexible optical transition zone (2) is flexible organopolysiloxane gel, it is contained in the base light-source chamber of lens (3) in advance, the space between full light source (1) and lens (3) can be filled due to the extruding of light source when described LED light source (1) and lens (3) link together.
2. raising light extraction efficiency according to claim 1 dazzle anti-blue light LED light structure drops, it is characterised in that (x, y) coordinate is (0.33 ± 0.05,0.33 ± 0.05) to the CIE of described optical texture emergent light.
3. raising light extraction efficiency according to claim 1 dazzle anti-blue light LED light structure drops, it is characterised in that described optical texture goes out the color rendering index of light more than 80.
4. raising light extraction efficiency according to claim 1 dazzle anti-blue light LED light structure drops, it is characterized in that, described organopolysiloxane gel optical transition layer (2) is mixed the blue-light absorbers being equivalent to organopolysiloxane gel interpolation quality 0.1%-0.3%.
5. raising light extraction efficiency according to claim 4 dazzle anti-blue light LED light structure drops, it is characterised in that the refractive index of described organopolysiloxane gel is between 1.5-1.6.
6. raising light extraction efficiency according to claim 4 dazzle anti-blue light LED light structure drops, it is characterised in that the light transmittance of described organopolysiloxane gel is more than 95%.
7. raising light extraction efficiency according to claim 4 dazzle anti-blue light LED light structure drops, it is characterised in that also possibly together with light diffusing agent and brightener in described organopolysiloxane gel.
8. raising light extraction efficiency according to claim 4 dazzle anti-blue light LED light structure drops, it is characterised in that described blue-light absorbers is the Metal Substrate derivatives of porphyrin (5) being coated with by surfactant (4).
9. raising light extraction efficiency according to claim 8 dazzle anti-blue light LED light structure drops, it is characterised in that described surfactant (4) is dodecylbenzene sodium sulfonate.
10. the LED light structure dropping dazzle anti-blue light of raising light extraction efficiency according to claim 1, it is characterised in that the optical surface of described lens is covered with scute structure (6).
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| CN201610259795.7A CN105762262A (en) | 2016-04-21 | 2016-04-21 | Glare reduction blue light prevention LED optical structure capable of increasing light extraction efficiency |
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| CN201610259795.7A CN105762262A (en) | 2016-04-21 | 2016-04-21 | Glare reduction blue light prevention LED optical structure capable of increasing light extraction efficiency |
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| CN108286664A (en) * | 2018-03-11 | 2018-07-17 | 哈尔滨医大眼科医疗科技开发有限公司 | A kind of infant's special lamp |
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Application publication date: 20160713 |