CN102720987A - Light emitting diode (LED) area source employing side light emitting bar - Google Patents
Light emitting diode (LED) area source employing side light emitting bar Download PDFInfo
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- CN102720987A CN102720987A CN2012101649443A CN201210164944A CN102720987A CN 102720987 A CN102720987 A CN 102720987A CN 2012101649443 A CN2012101649443 A CN 2012101649443A CN 201210164944 A CN201210164944 A CN 201210164944A CN 102720987 A CN102720987 A CN 102720987A
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Abstract
The invention discloses an LED area source employing a side light emitting bar. The LED area source comprises a framework, an LED light source, a light pipe, and a diffuser with gradient reflective index, wherein the LED light source is a plane type two-sided light emitting LED light source; at least one LED chip is arranged in the LED light source; the LED light source and the light pipe are fixed in the framework; the LED light source is embedded into the light pipe; and the framework is covered with the diffuser. The LED area source employing the side light emitting bar overcomes the shortcoming that the low luminance around the framework leads to poor uniformity of the luminance in the traditional structure, the structure that the LED light source is embedded into the two ends of the light pipe, and the diffuser is adopted, so that the luminance uniformity of a backlight is improved; and simultaneously the plane type two-sided light emitting LED light source is adopted, so the LED area source has the characteristics of high luminance, good thermal conductivity, low extra power consumption, long service life and the like, and the corresponding performance of the backlight is improved.
Description
Technical field
The present invention relates to a kind of LED-backlit source, relate in particular to a kind of distribution of light uniformly, with the LED area source of the luminous Column being luminous of side.
Background technology
LCD is general main to be made up of LCD (liquid crystal panel) and backlight.Because LCD itself is not luminous; So LCD need realize that transmission or reflection show through external light source; Thereby existing LCD great majority are the transmission-type devices that have backlight; The characteristics of luminescence of backlight will directly have influence on the picture quality of LCD display spare, and backlight is the very important building block of LCD.CCFL (cold-cathode lamp light pipe) cheap, technology maturation is the main back light of existing LCD backlight; But reason because of itself structure and assembling; Produce the ray phenomenon when being prone to cause finished product luminous, can't satisfy the visual effect more and more perfectly requirement of market back light.
Led light source is the green colored backlights light source of future generation that is expected most, compares with other back light, and it has the following advantages: 1, led light source is a kind of flat-type light source, and the as easy as rolling off a log area source that forms set area of combining has good brightness uniformity; 2, reach 100,000 hours the service life of led light source,, also can use continuously 27 years, prolonged the service life of backlight greatly even if used 10 hours every day continuously; 3, led light source has firm internal structure, and anti-seismic performance is outstanding; 4, led light source need not use environmentally harmful mercury metal, environmental protection more.
The commercialization form in LED-backlit source mainly contains two kinds at present: a kind of is side-light type LED lamp, promptly at the edge designs LED of LCD lamp; A kind of is straight-down negative LED lamp, promptly all designs the LED lamp at the whole back side of LCD.The shortcoming of side-light type LED lamp mainly be can not carry out the light local area control, difficulty is applicable to large-sized backlight demand, the general following size backlight of 30in can adopt side-light type LED lamp.Straight-down negative LED modulated structure main devices comprises face type lamp plate (led light source) and diffuser plate, in order to make emitting brightness even, and the gap of nearly 20 ~ 30mm between face type lamp plate and the diffuser plate, thereby be difficult for slimming and adopt more LED sealing-in; Simultaneously, because the refractive index of the filler (being generally silica gel) of face type lamp onboard led sealing-in is about n=1.5, the light that led chip sends has total internal reflection at the light output surface of filler, has reduced the light extraction efficiency of led chip; And the light-entering surface of diffuser plate can produce reflection, and the light that the light output surface that encapsulates from LED sends is that some can not get in the diffuser plate.
Summary of the invention
Goal of the invention: in order to overcome the deficiency that exists in the prior art, the present invention provide a kind of simple in structure, distribution of light evenly, the LED area source of the luminous Column being luminous of usefulness side of good heat conductivity, long service life.
Technical scheme: for solving the problems of the technologies described above, the technical scheme that the present invention adopts is:
A kind of LED area source with the luminous Column being luminous of side comprises framework, led light source, leaded light post, has the scattering sheet of gradual change reflecting rate, and wherein led light source is the two-sided light extracting LED light source of plane formula, is provided with an above led chip in it; Said led light source and leaded light post all are fixed in the framework, and led light source is embedded in the leaded light post, and said scattering sheet covers on the framework.
Above-mentioned backlight adopts the two-sided light extracting LED light source of plane formula, has solved the heat dissipation problem of traditional LED, and has effectively reduced the overall weight of backlight, can process ultra-thin assembly; Cooperate leaded light post and scattering sheet can well spot light be converted into area source; When led light source is luminous; Evenly spread on the whole screen from the light transmission reflector of screen edge emission; Whole so just have enough backlight brightly, overcome traditional straight-down negative LED lamp and the uneven shortcoming of side entering type LED modulated structure backlight bright dipping, and the while has also been improved the utilization rate of led light source self greatly; In order to reach brightness requirement, can be provided with the plurality of LED chip in led light source inside.
Preferably; Said led light source is embedded in the two ends of leaded light post; The two ends that are the leaded light post have all embedded led light source, cooperate radiator and LED supply unit can solve wire jumper and heat dissipation problem that traditional straight-down negative LED lamp and single arrangement of side entering type LED lamp led chip cause well; Preferably, the power of said led light source is more than 0.5W, and lighting angle is 100 °, and is perhaps littler.
Preferably, said leaded light post is the shape that linear, Gauss surface shape or linear and Gauss surface shape combine according to the optical strength principle design; Can well the LED spot light be disperseed according to the calculation optimization result, reach the effect of even bright dipping, greatly improve the utilization rate of led light source simultaneously.
Preferably, the surface of said leaded light post cooperates the calculation optimization result according to the principle that goes out luminous intensity and light extraction efficiency, can do the optical treatment of modes such as plated film, gradual change type spraying, polishing or etching.
Preferably, the material of said leaded light post is a transparent material, can be one or more the combination in glass, crystalline ceramics, transparent plastic, transparent resin, transparent crystal, the yttrium-aluminium-garnet materials such as (YAG).
Preferably, said scattering sheet realizes the gradual change reflecting rate through the gradual change type reflection graphic patterns of one of which side surface, at the opposite side surface plating reflectance coating of scattering sheet; Like this when light passes through scattering sheet, because the different reflecting & transmitting rates of gradual change type reflection graphic patterns make the equally distributed light extraction efficiency that improved simultaneously of light; Said gradual change type Christmas tree pattern can be realized through dual mode: the one, and print at substrate surface, spray, processing such as printing or vapor deposition; Coating to cover different-thickness forms; The material of said coating is one or more the combination in the materials such as glass, crystalline ceramics, yttrium-aluminium-garnet, resin, the perhaps employed material of reference optical plated film; The 2nd, directly in substrate, do processing such as etching, cutting, polishing, form with the thickness difference that forms substrate.
Preferably, the base material of said scattering sheet is a transparent resin material.
Preferably, said frame inner surface can form high reflection or minute surface diffuse surface through the surface treatment of modes such as polishing, polishing, vapor deposition, improves its optical characteristics, and the cooperated with LED light source reaches the purpose that improves light extraction efficiency better; If form high reflection or minute surface diffuse surface through increase coating way (increasing coating through the vapor deposition mode) at frame inner surface, the material of coating can be organic high reflecting material (like polytetrafluoroethylene (PTFE)), oxide material (like titanium oxide, zirconia, magnesia, aluminium oxide) or high reflective aluminum silver alloy.The material of said framework is existing backlight frame materials such as plastics, aluminium alloy or titanium alloy, to reach the purpose of weight reduction, antidetonation, heat radiation.
The LED area source of the luminous Column being luminous of usefulness side of this case if increase polaroid, can also use as the LCD panel.
Beneficial effect: the LED area source with the luminous Column being luminous of side provided by the invention; To the low existing defective of brightness uniformity difference that causes of brightness around the traditional structure middle frame; Adopted leaded light post two ends to embed the structure that led light source cooperates scattering sheet simultaneously, the brightness uniformity of backlight is improved; The two-sided light extracting LED light source of plane formula that this case is simultaneously adopted has characteristics such as brightness height, good, the not extra power consumption of thermal conductivity, long service life, has improved the respective performances of backlight.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of the led light source of the present invention's employing;
Fig. 3 is the structural representation of the leaded light post of embedding led light source.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done explanation further.
Be illustrated in figure 1 as a kind of LED area source with the luminous Column being luminous of side, comprise framework 3, led light source 1, leaded light post 2, have the scattering sheet 4 of gradual change reflecting rate, wherein led light source 1 is the two-sided light extracting LED light source of plane formula, is provided with an above led chip in it; Said led light source 1 all is fixed in the framework 3 with leaded light post 2, and led light source 1 is embedded in the leaded light post 2, and said scattering sheet 4 covers on the framework 3.Said led light source 1 is embedded in the two ends of leaded light post 2.
Said led light source 1 is the two-sided light extracting LED light source of plane formula; Be provided with an above led chip 1-1 in it; Said led chip 1-1 becomes array to arrange; Led chip 1-1 can be red LED chip, blue-light LED chip or green light LED chip, but generally requires final led light source 1 to be white light LEDs; Led light source 1 as shown in Figure 2, two LEDs chip 1-1 have arranged on aluminium base 1-2.
As shown in Figure 3, all embedded led light source 1 at the two ends of leaded light post 2, leaded light post 2 is the shape that linear, Gauss surface shape or linear and Gauss surface shape combine according to the optical strength principle design.The different surfaces shape of leaded light post 2 has determined the different performance that it has: when leaded light post 2 adopted the linear shape, 2 on leaded light post had light-guiding function; When leaded light post 2 adopted Gauss surface shape shape, leaded light post 2 had diffusion function.The shape of the leaded light post 2 that linear and Gauss surface shape combine is preferably adopted in this case; After incident light gets into from the end of leaded light post 2; Penetrate on Gauss surface, under the effect of Gauss surface, light is mainly propagated with the almost parallel direction of the light output surface of leaded light post on the edge, inside of leaded light post.
Said leaded light post 2 adopts transparent materials (such as one or more the combination in the materials such as glass, crystalline ceramics, yttrium-aluminium-garnet, resin); Portion can be dispersed with astigmatic particle within it; Can carry out optical treatment (modes such as plated film, gradual change type spraying, polishing or etching, concrete can be at its end coated one deck light scattering layer etc.) on its surface.
Scattering sheet 4 mainly is to let within it the light propagated receive the effect of scattering and reflection simultaneously; The design of the light scattering ratio through scattering sheet 4 rationally is set, light transmission, gradual change type reflection graphic patterns; Can change the direction of propagation of main light; Light is almost propagated along the direction of parallel conductive light beam 2 light output surfaces, improved leaded light post 2 and go out uniformity of light.The base material of said scattering sheet 4 is transparent resin material (such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS) etc.); Simultaneously, in base material, can be doped with optical scatter, to regulate the scattering and the transmitance of light.Said gradual change type Christmas tree pattern can be realized through dual mode: the one, and print at substrate surface, spray, processing such as printing or vapor deposition; Coating to cover different-thickness forms; The material of said coating is one or more the combination in the materials such as glass, crystalline ceramics, yttrium-aluminium-garnet, resin, the perhaps employed material of reference optical plated film; The 2nd, directly in substrate, do processing such as etching, cutting, polishing, form with the thickness difference that forms substrate.The structure of appropriate design cutter mating plate 4 such as the shape and the density that on light guide sheet 4, increase coating, V-type groove structure, distribution site, can improve the brightness uniformity of emergent light.
Said framework 3 inner surfaces can improve its optical characteristics through the surface treatment of modes such as polishing, polishing, vapor deposition, and cooperated with LED light source 1 reaches the purpose that improves light extraction efficiency better; The material of said framework 3 is existing backlight frame materials such as plastics, aluminium alloy or titanium alloy, to reach the purpose of weight reduction, antidetonation, heat radiation.
In the structure of this case; The exiting surface of LED1 light source can directly touch leaded light post 2; Thereby; The thickness of the light-emitting component of the backlight of this case is the thickness that the thickness of light guide sheet 4 adds led light source 1, need not between light guide sheet 4 and led light source, to keep very large space, has realized the slimming of backlight.
The above only is a preferred implementation of the present invention; Be noted that for those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. LED area source with the luminous Column being luminous of side; It is characterized in that: this backlight comprises framework (3), led light source (1), leaded light post (2), has the scattering sheet (4) of gradual change reflecting rate; Wherein led light source (1) is the two-sided light extracting LED light source of plane formula, is provided with an above led chip in it; Said led light source (1) and leaded light post (2) all are fixed in the framework (3), and led light source (1) is embedded in the leaded light post (2), and said scattering sheet (4) covers on the framework (3).
2. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: said led light source (1) is embedded in the two ends of leaded light post (2), and the power of said led light source (1) is more than 0.5W, and lighting angle is smaller or equal to 100 °.
3. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: said leaded light post (2) is the shape that linear, Gauss surface shape or linear and Gauss surface shape combine according to the optical strength principle design.
4. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: the surface of said leaded light post (2) is through the optical treatment of plated film, gradual change type spraying, polishing or etching mode.
5. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: the material of said leaded light post (2) is one or more the combination in glass, crystalline ceramics, transparent plastic, transparent resin, transparent crystal, the yttrium aluminum garnet material.
6. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: said scattering sheet (4) realizes the gradual change reflecting rate through the gradual change type reflection graphic patterns of one of which side surface, at the opposite side surface plating reflectance coating of scattering sheet (4); Said gradual change type Christmas tree pattern through print at substrate surface, spray, printing or vapor deposition treatment, form with the coating that covers different-thickness, perhaps directly in substrate, do etching, cutting, polishing and handle, form with the thickness difference that forms substrate.
7. the LED area source with the luminous Column being luminous of side according to claim 6 is characterized in that: the material of said coating is one or more the combination in glass, crystalline ceramics, yttrium-aluminium-garnet, the resin material.
8. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: the base material of said scattering sheet (4) is a transparent resin material.
9. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: said framework (3) inner surface forms high reflection or minute surface diffuse surface through the surface treatment of polishing, polishing, vapor deposition mode.
10. the LED area source with the luminous Column being luminous of side according to claim 1 is characterized in that: the material of said framework (3) is plastics, aluminium alloy or titanium alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101649443A CN102720987A (en) | 2012-05-25 | 2012-05-25 | Light emitting diode (LED) area source employing side light emitting bar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101649443A CN102720987A (en) | 2012-05-25 | 2012-05-25 | Light emitting diode (LED) area source employing side light emitting bar |
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| CN107013863A (en) * | 2016-01-27 | 2017-08-04 | 欧司朗有限公司 | Light for vehicle |
| CN109003570A (en) * | 2018-08-24 | 2018-12-14 | Oppo广东移动通信有限公司 | Electronic equipment and its control method |
| US10900657B2 (en) | 2017-08-01 | 2021-01-26 | Technical Consumer Products, Inc. | Edge-lit light fixture having capabilities for a secondary service |
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Application publication date: 20121010 |