CN202708819U - Highlight brightness LED direct illumination-type backlight - Google Patents
Highlight brightness LED direct illumination-type backlight Download PDFInfo
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- CN202708819U CN202708819U CN2012202384708U CN201220238470U CN202708819U CN 202708819 U CN202708819 U CN 202708819U CN 2012202384708 U CN2012202384708 U CN 2012202384708U CN 201220238470 U CN201220238470 U CN 201220238470U CN 202708819 U CN202708819 U CN 202708819U
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Abstract
The utility model discloses a highlight brightness LED direct illumination-type backlight, comprising a framework, a plane type double face light extraction LED light source, a light guide sheet and an astigmatism film possessing a gradual change reflecting rate, wherein at least one LED chip is arranged in the LED light source; the LED light source and the light guide sheet are directly jointed and fixed in the framework; the astigmatism film is covered on the framework; the light guide sheet is located between the LED light source and the astigmatism film. Aiming to overcome the defects of bad uniformity of luminance of a traditional structure caused by high intermediate brightness and low peripheral brightness, the highlight brightness LED direct illumination-type backlight employs a plane type double face light extraction LED light source to cooperate with the light guide sheet, which improves uniformity of luminance of a backlight; meanwhile compared with a traditional LED light source, the plane type double face light extraction LED light source has the characteristics of high brightness, good thermal conductivity and a long service life, does not consume extra electricity and improves corresponding performances of the backlight.
Description
Technical field
The utility model relates to a kind of LED-backlit source, relate in particular to a kind of distribution of light uniformly, the high-brightness LED direct-light-type backlight.
Background technology
Liquid crystal display is general main by the LCD(liquid crystal panel) and backlight form.Because LCD itself is not luminous, so LCD need to realize transmission or reflective display by external light source, thereby existing LCD great majority are the transmission-type devices with 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 liquid crystal display.The CCFL(cold-cathode lamp light pipe of cheap, technology maturation) is the main back light of existing LCD backlight, but the reason because of itself structure and assembling, produce the ray phenomenon when easily causing finished product luminous, can't satisfying the market to the more and more perfectly requirement of visual effect of 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, even if used 10 hours every day continuously, also can use continuously 27 years, greatly prolonged the service life of backlight; 3, led light source has firm internal structure, and anti-seismic performance is outstanding; 4, led light source does not need to use environmentally harmful mercury metal, more environmental protection.
The commercialization form in LED-backlit source mainly contains two kinds at present: a kind of is side-light type LED lamp, namely at the edge designs LED of liquid crystal display lamp; A kind of is straight-down negative LED lamp, namely all designs the LED lamp at the whole back side of liquid crystal display.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, for so that emitting brightness is 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 enter in the diffuser plate.
The utility model content
Goal of the invention: in order to overcome the deficiencies in the prior art, the utility model provide a kind of simple in structure, distribution of light evenly, the high-brightness LED direct-light-type backlight of good heat conductivity, long service life.
Technical scheme: for solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of high-brightness LED direct-light-type backlight comprises framework, the two-sided light extracting LED light source of flat thin chip, light guide sheet, has the scattering sheet of gradual change reflecting rate, wherein is placed with an above led chip in the led light source; Described led light source and light guide sheet directly post and fix in framework, and scattering sheet covers on the framework, and light guide sheet is between led light source and scattering sheet.
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 make ultrathin module; Cooperate light guide sheet and scattering sheet led light source can well be converted into uniform area source, overcome traditional straight-down negative LED lamp and the inhomogeneous shortcoming of side entering type LED modulated structure backlight bright dipping, also greatly improved the utilization rate of led light source self simultaneously; In order to reach brightness requirement, it is inner that led chip can become array to be arranged in whole led light source.
Described led light source directly is attached on the light guide sheet, cooperates radiator and LED supply unit can solve well 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.
Preferably, the shape of described light guide sheet and roughness are the shape that linear and Gauss surface shape combine according to the optical strength principle design; Can be well led light source be disperseed according to the calculation optimization result, reach and evenly go out effect of light, greatly improve the utilization rate of led light source simultaneously.
Preferably, the surface of described light guide sheet cooperates the calculation optimization result according to the principle that goes out luminous intensity and light extraction efficiency, can do the optical treatment of the modes such as plated film, gradual change type spraying, polishing or etching.
Preferably, the material of described light guide sheet can be one or more the combination in glass, crystalline ceramics, transparent plastic, transparent resin, transparent crystal, yttrium-aluminium-garnet (YAG) material.
Preferably, described scattering sheet realizes the gradual change reflecting rate by its surperficial gradual change type reflection graphic patterns, like this when light passes through scattering sheet, because the difference of gradual change type reflection graphic patterns reflection transmitance makes the equally distributed light extraction efficiency that improved simultaneously of light; Described gradual change type Christmas tree pattern can be realized by dual mode: the one, and print at substrate surface, spray, the processing such as printing or evaporation, to cover the coating formation of different-thickness, the material of described 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 do the processing such as etching, cutting, polishing in substrate, form with the thickness difference that forms substrate.
Preferably, the base material of described scattering sheet is transparent resin material.
Preferably, described frame inner surface can form by the surface treatment of the modes such as polishing, polishing, evaporation high reflection or minute surface diffuse surface, 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 by increase coating way (increasing coating by the evaporation mode) at frame inner surface, the material of coating can be organic high reflecting material (such as polytetrafluoroethylene (PTFE)), oxide material (such as titanium oxide, zirconia, magnesia, aluminium oxide) or high reflective aluminum silver alloy.The material of described framework is the 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 high-brightness LED direct-light-type backlight that the utility model provides, intermediate luminance for traditional structure is high, the low poor existing defective of brightness uniformity that causes of brightness all around, adopted the two-sided light extracting LED light source of plane formula to cooperate the structure of light guide sheet, the brightness uniformity of backlight is improved; Simultaneously the two-sided light extracting LED light source of plane formula traditional led light source of comparing has the characteristics such as brightness height, good, the extra power consumption of thermal conductivity, long service life, has improved the respective performances of backlight.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of the led light source of the utility model employing.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Be illustrated in figure 1 as a kind of high-brightness LED direct-light-type backlight, comprise framework 1, the two-sided light extracting LED light source 2 of flat thin chip, light guide sheet 3, have the scattering sheet 4 of gradual change reflecting rate, wherein be placed with an above led chip in the led light source 2; Described led light source 2 and light guide sheet 3 directly post and fix in framework 1, and scattering sheet 4 covers on the framework 1, and light guide sheet 3 is between led light source 2 and scattering sheet 4.
Described led light source 2 is the two-sided light extracting LED light source of plane formula, be provided with an above led chip 2-1 in it, described led chip 2-1 becomes array to arrange, led chip 2-1 can be red LED chip, blue-light LED chip or green light LED chip, but the final led light source 2 of General Requirements is white light LEDs; Led light source 2 as shown in Figure 2 is at substrate arranged 15 row, 14 row led chip 2-1.
The shape of described light guide sheet 3 and roughness according to the optical strength principle design for or the shape that combines of linear and Gauss surface shape.Light guide sheet 3 surface configurations have determined the performance that it has, and the shape that employing linear and Gauss surface shape combine is so that it has astigmatism functions when having light-guiding function; After incident light enters light guide sheet 3, penetrate on Gauss surface, under the effect of Gauss surface, light mainly in the inside of light guide sheet along with the light output surface of light guide sheet almost parallel direction propagate.
Described light guide sheet 3 adopts transparent materials (such as one or more the combination in the materials such as glass, crystalline ceramics, yttrium-aluminium-garnet, resin), section 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) on its surface.
Scattering sheet 4 mainly is to allow within it the light propagated be subject to simultaneously the effect of scattering and reflection, the design of the light scattering ratio by 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 mating plate 3 light output surfaces, improved light guide sheet 3 and go out uniformity of light.The base material of described 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, with scattering and the transmitance of light regulating.Described gradual change type Christmas tree pattern can be realized by dual mode: the one, and print at substrate surface, spray, the processing such as printing or evaporation, to cover the coating formation of different-thickness, the material of described 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 do the processing such as etching, cutting, polishing in substrate, 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 increase coating, V-type groove structure, distribution site in light guide sheet 4, can improve the brightness uniformity of emergent light.
Described framework 1 inner surface can improve its optical characteristics by the surface treatment of the modes such as polishing, polishing, evaporation, and cooperated with LED light source 2 reaches the purpose that improves light extraction efficiency better; The material of described framework 1 is the existing backlight frame materials such as plastics, aluminium alloy or titanium alloy, to reach the purpose of weight reduction, antidetonation, heat radiation.
The above only is preferred embodiment of the present utility model; be noted that for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (7)
1. high-brightness LED direct-light-type backlight, it is characterized in that: this backlight comprises framework (1), the two-sided light extracting LED light source of plane formula (2), light guide sheet (3), has the scattering sheet (4) of gradual change reflecting rate, wherein is placed with an above led chip in the led light source (2); Described led light source (2) and light guide sheet (3) directly post and fix in framework (1), and scattering sheet (4) covers on the framework (1), and light guide sheet (3) is positioned between led light source (2) and the scattering sheet (4).
2. high-brightness LED direct-light-type backlight according to claim 1, it is characterized in that: described light guide sheet (3) is the shape that linear and Gauss surface shape combine according to the optical strength principle design.
3. high-brightness LED direct-light-type backlight according to claim 1, it is characterized in that: the surface of described light guide sheet (3) is through the optical treatment of plated film, gradual change type spraying, polishing or etching mode.
4. high-brightness LED direct-light-type backlight according to claim 1, it is characterized in that: described scattering sheet (4) realizes the gradual change reflecting rate by its surperficial gradual change type reflection graphic patterns, described gradual change type Christmas tree pattern by print at substrate surface, spray, printing or vapor deposition treatment, to cover the coating formation of different-thickness, perhaps directly do etching, cutting, grinding process in substrate, form with the thickness difference that forms substrate.
5. high-brightness LED direct-light-type backlight according to claim 1, it is characterized in that: the base material of described scattering sheet (4) is transparent resin material.
6. high-brightness LED direct-light-type backlight according to claim 1 is characterized in that: described framework (1) inner surface forms high reflection or minute surface diffuse surface through the surface treatment of polishing, polishing, evaporation mode.
7. high-brightness LED direct-light-type backlight according to claim 1, it is characterized in that: the material of described framework (1) is plastics, aluminium alloy or titanium alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202384708U CN202708819U (en) | 2012-05-25 | 2012-05-25 | Highlight brightness LED direct illumination-type backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202384708U CN202708819U (en) | 2012-05-25 | 2012-05-25 | Highlight brightness LED direct illumination-type backlight |
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| CN202708819U true CN202708819U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012202384708U Expired - Fee Related CN202708819U (en) | 2012-05-25 | 2012-05-25 | Highlight brightness LED direct illumination-type backlight |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720988A (en) * | 2012-05-25 | 2012-10-10 | 苏州晶品光电科技有限公司 | High-brightness direct-type backlight source of LED (light emitted diode) |
| CN107270242A (en) * | 2017-07-21 | 2017-10-20 | 中国科学院上海光学精密机械研究所 | Lift the amplifier architecture of xenon lamp transmission efficiency and distributing homogeneity |
-
2012
- 2012-05-25 CN CN2012202384708U patent/CN202708819U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720988A (en) * | 2012-05-25 | 2012-10-10 | 苏州晶品光电科技有限公司 | High-brightness direct-type backlight source of LED (light emitted diode) |
| CN107270242A (en) * | 2017-07-21 | 2017-10-20 | 中国科学院上海光学精密机械研究所 | Lift the amplifier architecture of xenon lamp transmission efficiency and distributing homogeneity |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20130525 |