CN104373897A - LED secondary lens and LED lamp - Google Patents

LED secondary lens and LED lamp Download PDF

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Publication number
CN104373897A
CN104373897A CN201410681761.8A CN201410681761A CN104373897A CN 104373897 A CN104373897 A CN 104373897A CN 201410681761 A CN201410681761 A CN 201410681761A CN 104373897 A CN104373897 A CN 104373897A
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China
Prior art keywords
lens
described
led
camber
light
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CN201410681761.8A
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Chinese (zh)
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CN104373897B (en
Inventor
孟长军
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创维液晶器件(深圳)有限公司
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Publication of CN104373897A publication Critical patent/CN104373897A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/04Refractors for light sources of lens shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00Point-like light sources

Abstract

The invention discloses an LED secondary lens and an LED lamp. The LED secondary lens comprises a first lens body and a second lens body arranged on the first lens body. The first lens body comprises a bottom face and a first outer curved face located on the upper portion of the bottom face. The middle of the bottom face of the fist lens body is concave upwards and inwards to form a first inner curved face. The second lens body comprises a second inner curved face making contact with the first outer curved face of the first lens body and a second outer curved face located above the second inner curved face. The first outer curved face and the second outer curved face are each a curved face with the downwards and inwards concave middle and the outwards convex periphery. By the adoption of the double-layer lens structure, light is refracted at least three times through the secondary lens, incident light is more disperse, and chromatic aberration and yellow spot phenomena are avoided. The curvature of the first inner curved face, the curvature of the first outer curved face and the curvature of the second outer curved face are adjusted according to the light emitting characteristic of an LED chip, light brightness and color uniformity are optimized greatly, and the quality of a backlight module is improved.

Description

A kind of LED secondary lens and LED

Technical field

The present invention relates to photoelectric field, be specifically related to a kind of LED secondary lens and LED.

Background technology

In down straight aphototropism mode set, the light that LED luminescence chip sends carries out luminous intensity distribution through secondary lens, form uniform hot spot, multiple Bright foldings that multiple LED luminescence chip is formed on diffuser plate, thus reach the requirement of straight lower backlight module to light-source brightness and uniformity of chromaticity.

Secondary lens and LED luminescence chip are two independently objects, but inseparable, and its major function is the angle wanted arbitrarily that the angle collection of the light sent by LED luminescence chip becomes between 5 ° to 160 °, form uniform light spots.The material of secondary lens generally uses optical grade PMMA material or PC material; Can select glass under special circumstances, its refractive index is all greater than the refractive index of air.

After dispersion phenomenon refers to that polychromatic light enters into another different medium of refractive index from a kind of medium, because the light of another medium to different frequency has different refractive indexes, there is deviation in various degree the direction of propagation of the light of various frequency.When polychromatic light is by prism, there is deviation in various degree in the direction of propagation, thus just disperseing separately when leaving prism, form spectrum.

The many employings of existing direct-light type LED backlight LCD TV add individual layer secondary lens before LED luminescence chip, by individual layer secondary lens, secondary light-distribution is carried out to the light that LED luminescence chip sends, to reduce the use amount of backlight module thickness and LED luminescence chip, meet the requirement of backlight module to backlight briliancy and uniformity simultaneously.

Conventional white light LEDs luminescence chip uses blue chip to excite yellow fluorescent powder luminous, and its light is the white light that gold-tinted and blue light are formed.The refractive index of blue light and white light is different in secondary lens, so the hot spot that secondary lens emergent light is formed can form regular yellow and blue region, yellow area is referred to as macula lutea, the appearance of macula lutea reduces the brightness of backlight and the uniformity of colourity, has had a strong impact on the taste of backlight module.Fig. 1 is the brightness schematic diagram of LED luminescence chip by the hot spot of traditional secondary lens forming, X and Y is the abscissa and the ordinate that represent spot size, and grey parts is hot spot, and in hot spot, grey lighter expression brightness is higher.As shown in Figure 1, the hot spot brightness uniformity of traditional secondary lens forming is not good, and mid portion is brighter.Fig. 2 is the colourity schematic diagram of LED luminescence chip by the hot spot of traditional secondary lens forming, X and Y is the abscissa and the ordinate that represent spot size, and grey parts is hot spot, and the region that in the middle part of hot spot, grey is lighter is gold-tinted concentration zones, i.e. macula lutea, the darker region of peripheral grey is blue light concentration zones.It can thus be appreciated that the hot spot uniformity of chromaticity of traditional secondary lens forming is not good, and macula lutea phenomenon is serious.

Can carry out reflecting and being totally reflected according to the curvature on secondary lens surface after the light that LED luminescence chip sends passes secondary lens, and due to the difference of the optical index of different colours (frequency), brightness uniformity and the uniformity of chromaticity of hot spot can be affected.Under number trend less and less that is more and more thinner in current down straight aphototropism mode set, LED luminescence chip simultaneously, the light that LED luminescence chip sends incides phenomenon diffuser plate more easily being formed " macula lutea " and lamp shadow by individual layer secondary lens.

Therefore, prior art need improvement and bring new ideas.

Summary of the invention

In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of LED secondary lens and LED, by the first lens and second lens of described LED secondary lens, by light adjustment twice, optimize brightness uniformity and the uniformity of chromaticity of hot spot, improve the quality of backlight module.

In order to achieve the above object, this invention takes following technical scheme:

A kind of LED secondary lens, comprises the first lens and is located at the second lens on the first lens, and described first lens comprise bottom surface and are positioned at the first positive camber above bottom surface, and the middle part of the bottom surface of described first lens upwards indent forms the first negative camber; Described second lens comprise the second negative camber contacted with the first positive camber of the first lens and the second positive camber be positioned at above the second negative camber, and described first positive camber and the second positive camber are middle part indent, the cambered outwards curved surface of surrounding downwards.

In described LED secondary lens, described second negative camber is identical with the first positive camber shape and fit.

In described LED secondary lens, the refractive index of described second lens is greater than the refractive index of the first lens, and the refractive index of described first lens is greater than the refractive index of air.

In described LED secondary lens, described second lens also comprise ring-type bottom surface, and described second positive camber is connected with the second negative camber by described ring-type bottom surface.

In described LED secondary lens, the first negative camber of described first lens is the plane of incidence of light, and shape is half ellipsoidal surface.

In described LED secondary lens, the first negative camber of described first lens is the plane of incidence of light, and shape is the face of cylinder.

In described LED secondary lens, described first lens also comprise the column side with the plane perpendicular of the first lens, and described first positive camber is connected with the bottom surface of the first lens by described column side.

In described LED secondary lens, it is the prism of predetermined angle that described second lens also comprise with the ring-type bottom surface of the second lens, and described second positive camber is connected with the ring-type bottom surface of the second lens by described prism.

In described LED secondary lens, the first positive camber of described first lens and the second positive camber of the second lens are free form surface.

The present invention also provides a kind of LED, and described LED comprises LED luminescence chip and LED secondary lens as above, and described LED luminescence chip is installed in the first negative camber of described LED secondary lens.

Compared to prior art, LED secondary lens provided by the invention and LED, adopt the double-decker of the first lens and the superposition of the second lens, by the route adjust twice of light, can avoid the generation of aberration phenomenon and macula lutea phenomenon; By the curved design on the first lens and the second lens, that is more disperseed by the light of incidence goes out to be shot out, and optimizes the uniformity of brightness through the light of secondary lens and colourity, improves the quality of backlight module.

Accompanying drawing explanation

Fig. 1 is the brightness schematic diagram of LED luminescence chip by the hot spot of traditional secondary lens forming.

Fig. 2 is the colourity schematic diagram of LED luminescence chip by the hot spot of traditional secondary lens forming.

Fig. 3 is the sectional view of the first preferred embodiment of LED secondary lens of the present invention.

Fig. 4 is the light path schematic diagram of the first preferred embodiment of LED secondary lens of the present invention.

Fig. 5 is the sectional view of the second preferred embodiment of LED secondary lens of the present invention.

Fig. 6 is the light path schematic diagram of the second preferred embodiment of LED secondary lens of the present invention.

Fig. 7 is the brightness schematic diagram of the hot spot that LED luminescence chip is formed by secondary lens provided by the invention.

Fig. 8 is the colourity schematic diagram of the hot spot that LED luminescence chip is formed by secondary lens provided by the invention.

Detailed description of the invention

The invention provides a kind of LED secondary lens and LED, by arranging the first lens and being located at the second lens on the first lens, the direction of the light entering to shine can be adjusted twice, enhance the dimming capability of secondary lens, optimize brightness uniformity and the uniformity of chromaticity of hot spot.

For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

Refer to Fig. 3, LED secondary lens provided by the invention, the second lens 20 comprising the first lens 10 and be located on the first lens 10, described first lens 10 comprise bottom surface 110 and are positioned at the first positive camber 120 above bottom surface 110, and the middle part of the bottom surface 110 of described first lens 10 upwards indent forms the first negative camber 111; Described second lens 20 comprise the second negative camber 210 contacted with the first positive camber 120 of the first lens 10 and the second positive camber 220 be positioned at above the second negative camber 210, and described first positive camber 120 and the second positive camber 220 are middle part indent, the cambered outwards curved surface of surrounding downwards.

The present invention, by being located on the first lens 10 by described second lens 20, by the light dispersion again of the first lens 10 outgoing, can optimize the uniformity of brightness and colourity.Described first negative camber 111 for the light that makes LED luminescence chip and send through superrefraction laggard enter in the first lens.Because LED luminescence chip belongs to class lambert light emitting source, center brightness is higher, so the profile of the LED secondary lens designed according to the light type of LED luminescence chip, described first positive camber 120 and the second positive camber 220 are all designed to middle part indent, the cambered outwards curved surface of surrounding downwards, are conducive to the anaclasis that LED luminescence chip sends to go out more uniform hot spot.

In LED secondary lens provided by the invention, described second negative camber 210 is identical with the first positive camber 120 shape and fit, and two curved surfaces overlap in figure 3.Second negative camber 210 and the first positive camber 120 adopt the design of same shape, not only be conducive to installing and fixing the second lens, also be conducive to the light path design simplifying whole LED secondary lens, make during design light path, not need the space between consideration second negative camber 210 and the first positive camber 120.

Please continue to refer to Fig. 3, LED secondary lens described in the present invention first preferred embodiment is refraction type lens, be applicable to light mixing distance (LED luminescence chip light-emitting area is to the distance of the diffuser plate of backlight module) and be more than or equal to 25mm, in the down straight aphototropism mode set that a LED luminescence chip number is less simultaneously, it is by end face (the second positive camber) emergent ray.Described LED secondary lens is made up of glass or optical resin, preferably, adopt optical grade PMMA or PC material better, it carries out injection mo(u)lding mainly through mould, the present embodiment need by secondary injection molding or at twice after injection moulding combination collocation use.The refractive index of described second lens 20 is greater than the refractive index of the first lens 10, and the refractive index of described first lens 10 is greater than the refractive index of air, makes like this from the light of external incident successively after the first lens 10 and the refraction of the second lens 20, obtains maximum dispersing.

In first preferred embodiment provided by the invention, the bottom surface 110 of described first lens 10 except middle part upwards in be recessed into except the first negative camber 111, other parts are plane.Described second lens 20 also comprise ring-type bottom surface 230, and described second positive camber 220 is connected with the second negative camber 210 by described ring-type bottom surface 230.Described ring-type bottom surface 230 is plane, with the bottom surface 110 of the first lens 10 at grade, be conducive to the installation of the second lens 20 and fixing.

Please continue to refer to Fig. 3, the first negative camber 111 of described first lens 10 is the plane of incidence of light, and shape is half ellipsoidal surface, can certainly be hemisphere face or hyperboloid, as long as refraction of the light of incidence being tried one's best is dispersed.

Refer to Fig. 4, in figure, arrow represents a path that light passes through in the light beam that LED luminescence chip 30 sends.Described LED luminescence chip 30 is positioned at immediately below the first negative camber 111, it is inner that the light that described LED luminescence chip 30 sends is refracted to the first lens 10 through the first negative camber 111, fit tightly through the first positive camber 120 or the second negative camber 210(first positive camber 120 and the second negative camber 210 again) be refracted to the inside of the second lens 20, eventually pass the second positive camber 220 and be refracted on the diffuser plate of outside backlight module.Described LED luminescence chip 30 is area sources, and the angle of its light is in 0 ° ~ 180 °, and the light of different angles is different through the path of LED secondary lens, does not repeat one by one at this.The light that described LED luminescence chip 30 sends is through in the process of described LED secondary lens, have passed through three refractions, light is disperseed fully, and the light dispersion get Geng Kai that LED luminescence chip 30 center sends, when making light finally from the outgoing of LED secondary lens, pool lighting angle between 5 ° to 160 °, the hot spot of brightness and evenness.

Further, first positive camber 120 of described first lens 10 and the second positive camber 220 of the second lens 20 are free form surface, its curvature can freely adjust, therefore hot spot optimization be can carry out by the curvature of adjustment first positive camber 120 and the second positive camber 220, the brightness of hot spot and the uniformity of colourity improved to greatest extent.When designing each curved surface of LED secondary lens, due to curved surface, to be curve rotate 180 ° around the vertical central shaft of LED secondary lens forms, and therefore only need draw the equation of each curve.First according to the luminosity curve (relation of lighting angle and light intensity) of existing LED luminescence chip and the curvilinear equation of the first negative camber 111, derive the curvilinear equation of the first positive camber 120, then calculate the curvilinear equation of the second positive camber 220 targetedly by the curvilinear equation of the first positive camber 120.Finally drawn out in mapping software is as PRO-E by each curvilinear equation, rotating curve can draw the basic profile of LED secondary lens.Certainly, in practice, also need the LED secondary lens designed to carry out optical analog, and finely tune the curvilinear equation of secondary lens according to the luminescence phenomenon of reality, finally die sinking makes the material object of secondary lens again.

Refer to Fig. 5, LED secondary lens described in the present invention second preferred embodiment is refraction-reflection lens, be applicable to light mixing distance (LED luminescence chip light-emitting area is to the distance of backlight module diffuser plate) and be less than 20mm, in the down straight aphototropism mode set that a LED luminescence chip number is less simultaneously.Wherein, the first negative camber 111 of described first lens 10 is the plane of incidence of light, and shape is the face of cylinder, can certainly be ellipsoid, hemisphere face or hyperboloid, as long as refraction of the light of incidence being tried one's best is dispersed.

Described first lens 10 also comprise the column side 130 vertical with the bottom surface 110 of the first lens 10, and described first positive camber 120 is connected by the bottom surface 110 of described column side 130 with the first lens 10.

Described second lens 20 also comprise the prism 240 of ring-type bottom surface 230 in predetermined angle with the second lens 20, and described second positive camber 220 is connected by the ring-type bottom surface 230 of described prism 240 with the second lens 20.Described predetermined angle is be greater than 0 ° of any one angle be less than or equal in the interval of 90 °.The light that LED luminescence chip sends is after described LED secondary lens, and a part of light is by end face (the second positive camber 220) outgoing afterwards, and a part of light is by the outgoing of described prism 240.The light that first negative camber 111 can reflect by described column side 130 and prism 240, the first positive camber 120 and the second positive camber 220 be all-trans injection light again reflect after shine outside, light is disperseed more, optimizes brightness and the uniformity of chromaticity of LED secondary lens hot spot.

Refer to Fig. 6, in figure, arrow represents the path that four light in the light beam that LED luminescence chip 30 sends passes through.Described LED luminescence chip 30 is positioned at immediately below the first negative camber 111, it is inner that the first light 1 that described LED luminescence chip sends is refracted to the first lens 10 through the first negative camber 111, fit tightly through the first positive camber 120 or the second negative camber 210(first positive camber 120 and the second negative camber 210 again) be refracted to the inside of the second lens 20, eventually pass the second positive camber 220 and be refracted on the diffuser plate of outside backlight module.It is inner that the second light 2 that described LED luminescence chip sends is refracted to the first lens 10 through the first negative camber 111, then column side 130 is totally reflected to through the first positive camber 120, be refracted to the second lens 20 again through column side 130 inner, be refracted to finally by prism 240 on the diffuser plate of outside backlight module.It is inner that the 3rd light 3 that described LED luminescence chip sends is refracted to the first lens 10 through the first negative camber 111, then the inside of the second lens 20 is refracted to through the first positive camber 120, be totally reflected to prism 240 by the second positive camber 220 again, be refracted to finally by prism 240 on the diffuser plate of outside backlight module.It is inner that the 4th light 4 that described LED luminescence chip sends is refracted to the first lens 10 through the first negative camber 111, then be refracted to the inside of the second lens 20 through column side 130, eventually passes prism 240 and be refracted on the diffuser plate of outside backlight module.The path that light is propagated in LED secondary lens is mainly based on above-mentioned four, and certainly, the light that LED luminescence chip 30 sends also has other paths, does not repeat one by one at this.It can thus be appreciated that, the light that described LED luminescence chip 30 sends is through in the process of described LED secondary lens, not only have passed through three refractions, but also have passed through the total reflection of the first positive camber or the second positive camber, the direction of light transmition is more various, the light of all directions is mixed to get more fully and evenly, further optimizes the brightness of emergent ray and the uniformity of colourity.

Further, the first positive camber 120 of described first lens 10 and the second positive camber 220 of the second lens 20 are free form surface, and its curvature can freely adjust, and concrete adjustment and design process elaborate in a upper embodiment, do not repeat them here.

Fig. 7 is the brightness schematic diagram of the hot spot that LED luminescence chip is formed by secondary lens provided by the invention, X and Y is the abscissa and the ordinate that represent spot size, and grey parts is hot spot, and in hot spot, grey lighter expression brightness is higher.As shown in Figure 7, the hot spot brightness uniformity adopting secondary lens provided by the invention to be formed is good, has clear improvement compared with the hot spot shown in Fig. 1.Fig. 8 is the colourity schematic diagram of the hot spot that LED luminescence chip is formed by secondary lens provided by the invention, X and Y is the abscissa and the ordinate that represent spot size, grey parts is hot spot, and in hot spot, grey lighter expression color is more yellow, and grey more secretly represents that color is more blue.As shown in Figure 8, the hot spot uniformity of chromaticity adopting secondary lens provided by the invention to be formed is good, has clear improvement compared with the hot spot shown in Fig. 2.

Refer to Fig. 4 and Fig. 6, the present invention also provides a kind of LED, and described LED comprises LED luminescence chip 30 and LED secondary lens as above, and described LED luminescence chip 30 is installed in the first negative camber of described LED secondary lens.The detailed construction of described LED, the principle optimizing outgoing brightness and uniformity of chromaticity elaborate in above-mentioned two preferred embodiments, do not repeat them here.

In sum, LED secondary lens provided by the invention and LED, adopt the double-decker of the first lens and the superposition of the second lens, can by the route adjust twice of light, avoid the generation of aberration phenomenon and macula lutea phenomenon, avoid the problem of individual layer lens adjustment hot spot scarce capacity; By the curved design on the first lens and the second lens, that is more disperseed by the light of incidence goes out to be shot out, and optimizes the uniformity of brightness through the light of secondary lens and colourity, improves the quality of backlight module.

Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.

Claims (10)

1. a LED secondary lens, it is characterized in that, comprise the first lens and be located at the second lens on the first lens, described first lens comprise bottom surface and are positioned at the first positive camber above bottom surface, and the middle part of the bottom surface of described first lens upwards indent forms the first negative camber; Described second lens comprise the second negative camber contacted with the first positive camber of the first lens and the second positive camber be positioned at above the second negative camber, and described first positive camber and the second positive camber are middle part indent, the cambered outwards curved surface of surrounding downwards.
2. LED secondary lens according to claim 1, is characterized in that, described second negative camber is identical with the first positive camber shape and fit.
3. LED secondary lens according to claim 1 and 2, is characterized in that, the refractive index of described second lens is greater than the refractive index of the first lens, and the refractive index of described first lens is greater than the refractive index of air.
4. LED secondary lens according to claim 3, is characterized in that, described second lens also comprise ring-type bottom surface, and described second positive camber is connected with the second negative camber by described ring-type bottom surface.
5. LED secondary lens according to claim 1, is characterized in that, the first negative camber of described first lens is the plane of incidence of light, and shape is half ellipsoidal surface.
6. LED secondary lens according to claim 1, is characterized in that, the first negative camber of described first lens is the plane of incidence of light, and shape is the face of cylinder.
7. LED secondary lens according to claim 4, is characterized in that, described first lens also comprise the column side with the plane perpendicular of the first lens, and described first positive camber is connected with the bottom surface of the first lens by described column side.
8. LED secondary lens according to claim 7, is characterized in that, it is the prism of predetermined angle that described second lens also comprise with the ring-type bottom surface of the second lens, and described second positive camber is connected with the ring-type bottom surface of the second lens by described prism.
9. the LED secondary lens according to claim 1 or 8, is characterized in that, the first positive camber of described first lens and the second positive camber of the second lens are free form surface.
10. a LED, is characterized in that, described LED comprises LED luminescence chip and the LED secondary lens as described in claim 1-9 any one, and described LED luminescence chip is installed in the first negative camber of described LED secondary lens.
CN201410681761.8A 2014-11-25 2014-11-25 A kind of LED secondary lens and LED CN104373897B (en)

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CN106382547A (en) * 2015-08-28 2017-02-08 中山市泽源生物科技有限公司 LED lamp with rapid heat-dissipating and light-emitting height control functions
WO2017113254A1 (en) * 2015-12-30 2017-07-06 周肇梅 Direct-type backlight module
WO2017113249A1 (en) * 2015-12-30 2017-07-06 周肇梅 Backlight module

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CN201527991U (en) * 2009-10-28 2010-07-14 厦门华联电子有限公司 LED with toroidal lens
KR20130110997A (en) * 2012-03-30 2013-10-10 서울반도체 주식회사 Lens for light emitting diode and method for manufacturing the same
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106382547A (en) * 2015-08-28 2017-02-08 中山市泽源生物科技有限公司 LED lamp with rapid heat-dissipating and light-emitting height control functions
WO2017113254A1 (en) * 2015-12-30 2017-07-06 周肇梅 Direct-type backlight module
WO2017113249A1 (en) * 2015-12-30 2017-07-06 周肇梅 Backlight module

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