CN101881381A - White light emitting diode and white light emitting diode lamp - Google Patents
White light emitting diode and white light emitting diode lamp Download PDFInfo
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- CN101881381A CN101881381A CN2009100981887A CN200910098188A CN101881381A CN 101881381 A CN101881381 A CN 101881381A CN 2009100981887 A CN2009100981887 A CN 2009100981887A CN 200910098188 A CN200910098188 A CN 200910098188A CN 101881381 A CN101881381 A CN 101881381A
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Abstract
The invention discloses a white light emitting diode with high color rendering property and a white light emitting diode lamp. The white light emitting diode comprises a heat conducting substrate, a light reflecting cup, a light emitting diode chip and a lead wire frame, wherein the light reflecting cup plays a light mixing role, and small protrusions are arranged on the inner wall surface of the light reflecting cup; the light emitting diode chip outputs at least six lights in different colors and is arranged on the heat conducting substrate to carry out electric combination; the lead wire frame is matched with the bottom of a light emitting cup in shape and size, arranged outside the light reflecting cup, and fixed on the upper surface of a base; an electrode of the chip is electrically connected with a lead wire on the lead wire frame, and a transparent optical material is covered on the chip; and polychromatic lights are evenly mixed through the diffuse reflection of a reflecting wall of the light reflecting cup to produce the white light emitting diode with high color rendering property and high efficiency. By applying the white light emitting diode lamp made of the white light emitting diode and a flat light source, the white light emitting diode lamp eliminates the light energy loss of fluorescent powder in the photochromic conversion process, thereby having high electro-optical conversion efficiency, long service life and convenient batched production.
Description
Technical field
The present invention relates to a kind of light emitting diode (hereinafter to be referred as LED), particularly relate to a kind of with the light-emitting diode chip for backlight unit of sending out different colours more than 6, be placed on and carry out the electricity combination in the reflector that plays the mixed light effect, the light of multiple color is uniformly mixed into the white light emitting diode with high-color rendering, and uses the white led lamp that this light emitting diode is made.
Background technology
Seen in the market white light emitting diode all is to adopt blue light to add fluorescent material to be mixed and made into, blue light is the light-emitting diode chip for backlight unit generation of 450～470nm by emission wavelength, and fluorescent material is to absorb the blue emission green-yellow light, the light emitting diode made from the method is owing to lack the ruddiness composition, so colour rendering index is not high, be difficult to accomplish to replace the light source of general lighting.
The method of making white light emitting diode just under study for action also has following several:
A. lump together with three kinds of photochromic LED chip of red, green, blue, make it to mix the generation white light by blending agent.Because what light-emitting diode chip for backlight unit sent is monochromatic light, the wide about 20nm of half-power ripple, blending agent can not change the composition of spectrum, can only be mixed light, so the spectrum of this light emitting diode is three discrete peak values, so can not form the light source that continuous spectrum is difficult to form high-color rendering, and the diffuse reflection that blending agent forms makes light loss serious.
B.1998 June in year, the U.S. once proposed a method for designing (for example document CN1185042A), press described in the literary composition, set the colour rendering index that needs earlier, utilize the formula of colorimetry to calculate chromaticity coordinates then, calculate again when adopting three chips or four chips to form system, every kind of due wavelength of chip calculates the amplitude of each wavelength then; Yet this method for designing can not be used for actual white light LEDs makes, because:
1), this method for designing at most can only be effective to four kinds of chips, just do not have definite separating more than four kinds of chips, and four kinds of chips is to be difficult to reach high-color rendering;
What 2), this method provided separates, the wavelength that obtains not is the product that light-emitting diode chip for backlight unit factory can manufacture, so in fact the chip of producing in batches does not at present still reach the colour rendering of expection, in addition, in the document, more there is not the open technical scheme that how several light is mixed into white light;
3), in the document, openly do not put down in writing the light-emitting diode structure of a reality, so can not get the exercisable technical scheme of a kind of white light emitting diode from this method for designing.
C. use the ultraviolet excitation three primary colors fluorescent powder: this method is the same with fluorescent lamp on principle, but at first in encapsulation process, ultraviolet light has leakage unavoidably, and this can damage human body; Next is that the wavelength of present UV LED is quite long, excites the efficient of three primary colors fluorescent powder very low, and the electro-optical efficiency of itself is very low again, has caused whole light-emitting diodes tube efficiency very low, at present can't be practical.
Summary of the invention
The objective of the invention is to: the deficiency that overcomes above-mentioned prior art, particularly overcome in the scheme that adopts blue light to add the white light emitting diode that fluorescent material makes, owing to lack the ruddiness composition, its spectrum and standard lamp spectrum differ greatly, and the not high defective of colour rendering index; Thereby provide a kind of light-emitting diode chip for backlight unit with output different colours light more than 6 kinds or 6 kinds, be placed in and carry out the electricity combination on the heat conducting base, the reflecting wall diffuse reflection of the reflector that plays the mixed light effect by an inner wall belt thrust, polychromatic light is evenly mixed, and make have high-color rendering, high efficiency white light emitting diode.
Another object of the present invention is to: use the white light emitting diode with high-color rendering of the present invention, make white led lamp bubble and room lighting LED plane light source.This white led lamp bubble and room lighting LED plane light source have been eliminated fluorescent material loss to luminous energy in photochromic conversion, so the electro-optical efficiency height, and long service life is convenient to batch process.
The object of the present invention is achieved like this:
White light emitting diode (referring to Fig. 8 a-c) with high-color rendering provided by the invention comprising: a heat-conducting base, lead frame, reflector, 6 or 6 above chips and transparent silica gel or epoxy resin; Wherein, described reflector is installed on the heat conducting base upper surface, and described chip is installed on the interior heat conducting base of this reflector, and chip top covers transparent silica gel or epoxy resin; It is characterized in that described reflector is the beaker flask of a bottom hollow out, and the kick of mixed light effect has been set on this reflector internal face; Described lead frame shape and size match with described reflector bottom, and this lead frame is installed in the outside of described reflector bottom, and is fixed on the upper surface of described heat conducting base; Described chip more than 6 or 6 is the light-emitting diode chip for backlight unit of output different colours light more than 6 kinds or 6 kinds, and each chip is at least one, and two adjacent chip light emitting wavelength intervals are principle with 35～20nm; Be electrically connected between the described chip and adopt series, parallel or string and combination; The electrode of described chip is electrically connected with lead-in wire on the lead frame.
In above-mentioned technical scheme, the wavelength of the light-emitting diode chip for backlight unit of described 6 kinds of output different colours light is respectively: 457nm blue chip, 490nm blue green light chip, 525nm green glow chip, 560nm green-yellow light chip, the orange chip of 590nm and 630nm red light chips; The light-emitting diode chip for backlight unit of 6 kinds of output different colours light is one respectively, and the mode of arranging on heat conducting base is so that the staggered principle that is mixed into of different photochromic light; Electrical connection between the chip can adopt the mode of series, parallel or string and combination to connect, and in the mode of string and combination, if two groups of voltage drops in parallel are identical, then can adopt same power supply; If different, then can not adopt same power supply.Fig. 8 b has shown that a kind of electric connection mode is after three chips are connected into one group, and two groups of energisings in parallel are can two groups not in parallel yet, with one group of each power drives of two driving powers (three chips are connected), and also can be 6 whole series-feds of chip.Other electric connection mode can also be arranged, need to decide on the user.
In above-mentioned technical scheme, the light-emitting diode chip for backlight unit that also comprises 6 kinds of output different colours light respectively is 2, be separately positioned on the heat conducting base upper surface, 12 chip positions are staggered, and purpose is that 12 chips are divided into two groups for mixed light better, 6 chip series connection of each group, because core number is identical, so two groups pressure drop is identical, again two groups be together in parallel (as Fig. 8 d); Add that two groups of electric currents that pass through of voltage also are identical, so LED can send uniform white light, 6 chips of power ratio Fig. 8 of LED (b) have increased by one times.
In above-mentioned technical scheme, described chip is that the chip of output different colours light more than 6 kinds is 9 or 11 kind, purpose is to make the spectral energy distribution curve of LED more smooth, the spectral energy distribution curve of lamp more is near the mark, for example adopt 457nm 465nm 490nm 515nm 535nm 560nm590nm 610nm 630nm totally 9 kinds of led chips, each chip is one, its arrangement on heat conducting base and electric connection mode are shown in Fig. 8 d, and the arrangement of chip position is so that mixed light is a principle; Electrical connection between the light-emitting diode chip for backlight unit of 9 kinds of output different colours light has been divided into unequal two groups, one group of photochromic inclined to one side indigo plant, light-emitting diode chip for backlight unit by 5 kinds of output different colours light is composed in series, and another group is composed in series (seeing Fig. 8 d) by the light-emitting diode chip for backlight unit of four kinds of output different colours light of red partially wavelength; Because two groups of chip quantity is unequal, so two independently power drives will be arranged, though power supply is more loaded down with trivial details, two groups can the independent regulation electric current, and this is very favorable to regulating LED photochromic.
In above-mentioned technical scheme, described light-emitting diode chip for backlight unit can be used the power cake core, also can be with a plurality of little chip portfolios; The electrical power decision that total number of chip can be born by the power and the single chip of needs, this is that those skilled in the art can be implemented.
In above-mentioned technical scheme, described heat conducting base is made with the composite of metallic copper, aluminium or good heat conductivity to be had screw rod, screw or other pedestal of being convenient to installing mechanism, the pedestal that has radiating fin or Super-conductive conduit pedestal is arranged on flat pedestal, the bottom surface; Described radiating fin is spirality radiating fin or the heronsbill shape radiating fin that has single or multiple spirals; Or a kind of radiating subassembly.
In above-mentioned technical scheme, the described reflector 3 that plays the mixed light effect is metal material or other material making reflective, good heat conduction effect, for example: copper, aluminium etc.; The kick that is provided with on the reflector internal face is sphere, and the surface is still the very bright very high reflectivity that has; According to the needs of colour mixture, this kick can be equally big or small or different size; For the interlacing dislocation is arranged, array arrangement or descending evenly distributed, as long as make the angle of emergent light and uniformity meet instructions for use, Fig. 7 b and Fig. 7 c are respectively two kinds of typical arrangement modes on the reflector internal face in this kick.
The present invention also provides a kind of white led lamp bubble (as shown in Figure 9) that light emitting diode of the present invention is made of using, comprise the light emitting diode that at least one is above-mentioned, this light emitting diode links together by the screw rod on its pedestal, screw or other mechanism and a radiator direct mechanical, the lead-out wire of this light emitting diode is electrically connected with a drive circuit, drive circuit is electrically connected suit one printing opacity cell-shell on described light emitting diode by its shell with electric connector; The lower end of radiator is connected with a cup-shaped working of plastics, and the working of plastics volume inside is laid driving power, and working of plastics has guaranteed that enough good electric insulation is arranged between driving power and the radiator; The end of working of plastics is an electric connector; Reflector in the described light emitting diode is installed in described radiator upper end, and the reflector inwall has kick, and light is mixed.
The present invention also provides a kind of room lighting LED plane light source that light emitting diode of the present invention is made of using, and comprising: at least one above-mentioned light emitting diode, radiator, drive circuit, electric connector and transparent cell-shell; It is characterized in that, described radiator is that 2 or 4 reflecting walls compositions are set on the heat sink, described heat sink lower surface is a flap-like, the reflecting wall inner surface has kick, the outside of reflection wall has one to be electrically connected jack, be connected on the driving power, described transparent cell-shell is installed on the described reflection wall, becomes an independently face light emitting source; Perhaps 2 above LED plane combination of light sources are got up; Described light emitting diode is the white light emitting diode with high-color rendering.
In above-mentioned technical scheme, described electric connector is the lamp holder or the lamp screw base of both feet, multiway straight cutting, normally presses the E27 screw socket or the E14 screw socket of international uniform; Also can be other special interface, in order to be connected on the power supply.
In above-mentioned technical scheme, described printing opacity cell-shell is the cell-shell of glass or plastics transparent, the painted or diffusion of making.
In above-mentioned technical scheme, on the described printing opacity inner wall light-converting material layer is arranged.
White light emitting diode with high-color rendering provided by the invention has following advantage:
1. owing to adopt the light-emitting diode chip for backlight unit of sending out 6 kinds of color of light at least, be placed in and carry out the electricity combination on the heat conducting base, the reflecting wall diffuse reflection of the taper by a bottom hollow out, the reflector that plays the mixed light effect of inner wall belt thrust, polychromatic light is evenly mixed, and make have high-color rendering, high efficiency white light emitting diode and white led lamp, because its spectral power distribution is near standard lamp, all spectrum can both comprise in the human eye spectrum sensitivity, so mixed light is effective and colour rendering is good, light loss is few.
2. efficient height, at present popular fluorescent material absorb blue light and send green-yellow light, and energy has certain loss in the process, and the present invention does not use fluorescent material, has avoided the energy loss of this part; Again owing to having taked special light mixing method, so the luminous efficiency height.
3. light decay is little, photochromic high conformity.The present white light emitting diode made of popular approach, its decay say so the substantially decay of chip light emitting and two kinds of comprehensive results of decay of fluorescent material; And the light emitting diode that the present invention makes does not have the factor of fluorescent material decay; Its photochromic photochromic and mixability that depends on chip fully is so as long as every kind of chip wavelength selecting for use in producing in batches is consistent, export the photochromic also just consistent of light.
4. light emitting diode of the present invention and LED light lamp can also be realized personalized illumination, as long as just can change the light intensity that its is exported, thereby change this light emitting diode and LED light lamp sends the correlated colour temperature of light until monochromatic light by the forward current of regulating every kind of chip.
Description of drawings
Fig. 1 is an international standard lamp A light source light spectrum energy profile, and colour temperature is 2856 ° of K;
Fig. 2 is the spectral power distribution figure of international standard lamp D65 light source, and colour temperature is 6504 ° of K;
Fig. 3 a is the spectral power distribution figure with A light source standard lamp after the human eye vision function intercepting wavelength period;
Fig. 3 b is with D65 standard lamp spectral power distribution figure after the human eye vision function intercepting wavelength period;
Fig. 4 is the spectral power distribution figure of three light emitting diodes of red, green, blue;
Fig. 5 is the spectral power distribution figure of six kinds of light emitting diodes of the present invention;
Fig. 6 is the spectral power distribution figure after six kinds of spectrum of the present invention synthesize;
Fig. 7 a is a kind of arrangement mode profile of the kick on the reflector inwall of the present invention;
Fig. 7 b is the another kind of arrangement mode vertical view of the kick on the reflector inwall of the present invention;
Fig. 7 c is the third arrangement mode schematic diagram of kick on the reflector inwall of the present invention;
Fig. 8 a is a kind of section of structure of white light emitting diode with high-color rendering of the present invention;
Fig. 8 b is a kind of arrangement and the electric connection mode schematic diagram of 6 kinds of light-emitting diode chip for backlight unit on heat-conducting base that have of the present invention;
Fig. 8 c is a kind of arrangement and the electric connection mode schematic diagram of 6 kinds of light-emitting diode chip for backlight unit (2 every kind) on heat-conducting base that have of the present invention;
Fig. 8 d is a kind of arrangement and the electric connection mode schematic diagram of 9 kinds of light-emitting diode chip for backlight unit on heat-conducting base that have of the present invention;
Fig. 9 is the bulb structure schematic diagram that the white light emitting diode with high-color rendering of application the present invention making is made;
Figure 10 is the surface source luminescence diode bulb structural representation that the white light emitting diode with high-color rendering of application the present invention making is made;
The drawing explanation:
1-heat conducting base 2-lead frame 3-reflector
4-kick 5-light-emitting diode chip for backlight unit 6-transparent silica gel
The 7-LED electrode is drawn part 8-drive circuit 9-electrical apparatus interface
10-LED light source 11-printing opacity cell-shell 12-radiator
13-working of plastics 3 '-reflection shield 4 '-small embossment
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
The specific embodiment
The present invention proposes a kind of method of making the high-color rendering white-light light emitting diode, the concrete technical scheme that promptly embodiment adopted is implemented in accordance with the following methods.
The colour rendering of light source is to weigh the physical quantity of light source to illuminated object color reducing degree, and sunshine is the best light source of colour rendering; Because it has continuous spectrum in the scope of whole visible wavelength.For artificial light sources, can think that the colour rendering of specified standard lamp is best in the world; What they sent also is continuous spectrum, and different-colour is the spectral power distribution difference.Fig. 2 is the spectral power distribution of a D65 standard sources in the visible light part, and Fig. 1 is a standard A light source light spectrum energy profile.Make the spectral power distribution that the light emitting diode of high-color rendering will be copied standard lamp, sending one is continuous spectral power distribution and the approaching light of standard lamp basically, but the spectrum range that standard lamp covers is very wide, has comprised the whole zone of 380nm～780nm in the visible region.LED to satisfy this spectral region very difficulty also there is no need because human eye to the sensitizing range of spectrum at 450nm～700nm wave band.According to the luminous wave band of this condition and led chip, choose the foundation of 455nm～680nm wave band as the spectrum of preparation high-color rendering LED.
The spectrum of common R, G, B three coloured light as shown in Figure 4, the very big continuous spectrum curve that can not form of being separated by between two peak wavelengths.The spectrum that led chip sends light has a peak wavelength, and at its 1/2 power place wavelength a scope is arranged.General width is at peak wavelength ± 10nm, and has ± 18nm at 1/4 power place.For example peak wavelength is the red light chips of 630nm, and at 1/2 place of its Output optical power, its wave-length coverage is from 620nm～640nm, and at 1/4 place of power, its wave-length coverage is from 612nm～648nm.According to this characteristic of led chip, just might form a continuous spectrum.Chip that peak wavelength is 630nm for example, suppose that radiant power that it sends at 630nm is 1.0 is the 612nm place at wavelength so, its radiant power is about 1/4 of 630nm place, it is the chip of 594nm that a wavelength peak is arranged in addition again, suppose that its radiant power at the 594nm place is 1.0 too, this chip is that the 612nm place also has 1/4 radiant power at wavelength so, so when two chips are simultaneously luminous on this wavelength points of 612nm total radiant power should be though that 1/2. spectral power distribution of 630nm place or 594nm place radiation power value is not the continuous straight line of a level, be zigzag continuous spectrum still.There is 225nm the wavelength interval total from wavelength 455nm～680nm, and calculating according to interval 20nm to have 11 kinds of chips at least.In fact so multicore sheet is because its spectral energy distribution curve of the standard lamp under a certain correlated colour temperature is not a horizontal line, so can adjust optical wavelength as the case may be at interval.If the employing wavelength interval is 35nm, then 6 kinds of photochromic chips of difference just can constitute a zigzag continuous spectrum.Arrange by wavelength interval 35nm, the peak wavelength of employed 6 kinds of chips is respectively: 457nm, 493nm, 529nm, 565nm, 601nm and 640nm.
Consider chip production factory in specific embodiment, the chip wavelength of batch process is to customize, so choose the peak wavelength of 6 kinds of chips is respectively: 457nm, 490nm, 525nm, 560nm, 590nm and 630nm.Though this and the value of calculating have had the some deviation, can allow on actual fabrication.Except 630nm～590nm interval 40nm, other peak wavelength is at interval all less than 35nm, can on 1/4 energy, overlap, the chip of promptly supposing these 6 kinds of wavelength is simultaneously luminous, and the radiant power on peak wavelength is all identical, in the radiant power that all can have two kinds of chips to send from peak wavelength 18nm place, the total radiant power on this point is exactly the radiant power sum that two kinds of chips send so.So the spectral power distribution figure that forms is a zigzag continuous spectrum curve, can make the wavelength interval curve that diminishes become more straight smooth more than the combination of 6 kinds of photochromic chips; But the chip kind can be brought great difficulty to the producer too much.Fig. 8 d is a kind of chip position Pareto diagram of 9 kinds of photochromic chip portfolios.
Make the white light emitting diode of high-color rendering, second problem that solve is the energy distribution problem, and the present invention has two methods to regulate the size of energy on each wavelength:
1. select the number of chips of same peak wavelength for use, for example to imitative D65 light source, short wavelength's number of chips is more, and is more to the long wavelength's of imitative A light source number of chips.
2. regulate and control energy by the size of chip current.Light emitting diode after the forward conduction between a sizable Current Zone in, the light energy that it sends is to be directly proportional with forward current by it.Change the forward current flow through light emitting diode just can regulate the luminous energy that sends how much.But the change of electric current is advisable with the rated current that is no more than this chip.The method of regulating electric current can be direct current also can adopt pulse width modulation mode.
The 3rd difficult point that making high-color rendering white-light light emitting diode will solve is colour mixture.Traditional color mixing method is to cover a large amount of diffuse reflection agent above chip, causes light repeatedly scattering in the chip container cavity, thereby reaches the colour mixture purpose.Because diffuse reflection is unordered, so the loss of light is very serious, causes whole light emitting diode electro-optical efficiency to descend significantly.For solving the above problems, the present invention has the effect of mixed light again for existing reflection action; Just the inwall of the reflector that original fineness is very high is provided with kick one by one, and this kick is the part of a sphere, and the surface is still the very bright very high reflectivity that has.According to the needs of colour mixture, kick can be of a size, also can be descending, and the interlacing dislocation is arranged.Fig. 7 b and Fig. 7 c are respectively two kinds of typical arrangement modes.
The light-emitting area of power type light-emitting diode chip has 1 square millimeter approximately, closely and among a small circle, it can't be handled as a spot light, but area source, each thrust on the reflective surface all can be subjected to penetrating from the illumination of all directions, reflect away according to reflection law then, can be used as a small light source to each kick, it is luminous to the last direction and the side direction of spheroid, so both can well mix versicolor light, and can not lose the purpose that a lot of luminous energy reaches the high efficiency mixed light again.
With reference to figure 8a-Fig. 8 b, make a white light emitting diode with high-color rendering of the present invention.
The heat conducting base 1 of LED in the present embodiment for example uses metallic copper, aluminium or composite to make flat pedestal, and has radiating fin, and radiating fin is spirality radiating fin or the heronsbill shape radiating fin that has single or multiple spirals; Or any LED base of buying on the employing market.Or a kind of radiating subassembly of inventor's design, this radiating subassembly is by a support of building with highly heat-conductive material, described support is a super heat-conductive pipe, metal tube or metal bar, described fin is set and fin composition under a group is set around this support at described top of the trellis; Wherein, described fin center has through hole, and its hole size is identical with the external diameter of described super heat-conductive pipe, metal tube or metal bar; The internal diameter of described Super-conductive conduit or metal tube matches with screw rod, screw or other installing mechanism of the cooling base bottom surface of the light emitting diode that will install; A shell porous or netted that one usefulness insulating materials or metal are made is wrapped in outside the support, becomes one with support.
The reflector 3 that plays the mixed light effect adopts aluminium, copper or good silver-plated the making of material of other reflective function usually, be shaped as the beaker flask of bottom hollow out, and kick 4 (shown in Fig. 7 a) being set downwards from glow cup upper edge inwall, the diameter of its kick 4 is by the arrangement that diminishes greatly gradually (shown in Fig. 7 b).This kick 4 also can be arrayed (shown in Fig. 7 c), the interlacing dislocation is arranged.This reflector 3 is installed in the upper surface portion of the base 1 in the lead frame 2, and the angle of reflector 3 and heat-conducting base 1 all can between 10 °-80 °.This kick 4 is spherical surface body of an any surface finish, so the inwall of reflector is the very bright very high reflectivity that has.
Use the light-emitting diode chip for backlight unit that to have bought on the market of 6 routines in the present embodiment, being spaced apart about 35nm of peak wavelength between these 6 kinds of chips, their output light wavelengths are respectively about 457nm, 490nm, 525nm, 560nm, 590nm and 630nm; Wherein according between wavelength 457nm blue chip and wavelength 525nm green glow chip, the chip of a wavelength 490nm is set again, between wavelength 525nm green glow chip and wavelength 630nm red light chips, it is that 560nm green-yellow light chip and wavelength are 6 kinds of the orange chips of 590nm that peak wavelength is set at least again.Be electrically connected through lead-in wire between these 6 kinds of light-emitting diode chip for backlight unit 5, they can be all series connection or all in parallel, the part of also can connecting earlier is in parallel again so that regulate correlated colour temperature, present embodiment is connected into one group to three kinds of chips of 457nm 490nm 525nm, three kinds of chips in addition are connected into one group and draw by lead-out wire respectively, lead-out wire is used to connect driving power, these 6 kinds of arrangements of chips and electric connection mode are shown in Fig. 8 (b), after three chips are connected into one group, two groups of energisings in parallel, can two groups not in parallel yet, with one group of each power drives of two driving powers (three chips series connection), also can be 6 whole series-feds of chip.Other electric connection mode can also be arranged, need to decide on the user.It and existing RGB form the scheme of white light and compare: the chip of a wavelength 490nm being set between wavelength 457nm blue chip and wavelength 525nm green glow chip, peak wavelength is set between wavelength 525nm and wavelength 630nm red light chips at least is that 560nm and wavelength are the chip of 590nm.Wavelength interval between two adjacent peak wavelengths like this is 35nm basically when 6 chips are simultaneously luminous, will form a continuous spectral power distribution, and no longer is discrete peak value (seeing Fig. 5 Fig. 6) separately.
6 above-mentioned light-emitting diode chip for backlight unit 5 are placed on heat conducting base 1 upper surface, the electrode of 6 chips 5 after combination drawn from lead frame 2, lead frame 2 is embedding copper working of plastics or the making of MPCB plate, embedding copper sheet in the lead frame is drawn part 7 for the LED electrode, and its effect is by lead the LED electrode to be drawn with driving power to be electrically connected; Embedding copper sheet in the lead frame and heat conducting base 1 electric insulation; The outside of reflector 3 is a lead frame 2, and light-emitting diode chip for backlight unit 5 tops cover transparent silica gel or epoxy resin 7.
The electrode of above-mentioned six chips can also be drawn separately, also can divide into groups to draw, so that regulate the luminous energy that various chips send, reach needed photochromic, this is that those skilled in the art can implement.The spectral power distribution figure of six kinds of light emitting diodes of present embodiment as shown in Figure 6.
With reference to figure 8c, another kind of composition embodiment with white light emitting diode of high-color rendering of the present invention, chip by 6 kinds of output different colours light, every kind of wavelength chip has 2, be placed on heat conducting base 1 upper surface according to 12 light-emitting diode chip for backlight unit 5 shown in Fig. 8 c, these 12 chips are laying so that mixed light is a purpose of dislocation each other.The chip of 6 kinds of output different colours light, wavelength is respectively 457nm blue chip, 490nm blue green light chip, 525nm green glow chip, 560nm green-yellow light chip, the orange chip of 590nm and 630nm red light chips, is the principle setting with the 35nm wavelength at interval with adjacent two peak wavelengths; Totally 12 of the chips of 6 kinds of output different colours light are divided into 2 groups, and each core assembly sheet is connected into one group, draws with lead-out tablet respectively, connects driving power with lead again, and chip is electrically connected shown in Fig. 8 c.
With reference to figure 8d, another kind has the chip (chip of each wavelength has only) of 9 kinds of output different colours light, make the embodiment with white light emitting diode of high-color rendering of the present invention, purpose is to make the spectral energy distribution curve of LED more smooth, the spectral energy distribution curve of the lamp that more is near the mark.The wavelength of the chip of 9 kinds of output different wavelengths of light adopts 457nm, 465nm, 490nm, 515nm, 535nm, 560nm, 590nm, 610nm and 630nm respectively, and the positional alignment of 9 kinds of chips on a heat conducting base is so that mixed light is a principle.9 chips are divided into two groups, one group of photochromic inclined to one side indigo plant, promptly the wavelength of chip is that 5 chips of 457nm, 535nm, 560nm, 465nm and 490nm are composed in series; Another group is made up of four chips of red partially wavelength, i.e. wavelength 590nm, 630nm, 515nm and 610nm, and the two groups of chip of series connection by drawing with lead-out tablet, connects driving power with lead respectively; Because two groups of chip quantity is unequal, so have two groups independently power supply go to light it, though power supply is more loaded down with trivial details, but two groups can the independent regulation electric current, this is very favorable to regulating LED photochromic, the electrical power decision that total number of this LED chips can be born by the power and the single chip of needs, this is that those skilled in the art can be implemented.
Compare with 9 kinds of chip portfolios with 6 kinds of different colours light, between 457nm and 490nm, inserted the blue chip of a 465nm, the 33nm of originally from 490nm to 457nm, being separated by, the spectral energy distribution curve overlapping of these two chips should be at 1/4 power place, that insert 465nm chip and 457nm is 8nm at interval, insert 465nm chip and 490nm chip be at interval 25nm therefore, the overlapping of the light that light that the 465nm chip sends and 457nm490nm chip send should be more than 1/2 power, this just makes comprehensive curve become at this wave band almost is the straight line of a level, just all has almost equal power at 457nm each wavelength to this section of 490nm.As a same reason, between 490nm and 535nm, inserted a 515nm, made the peak wavelength of chip light emitting reduce to 25nm and 20nm from 45nm at interval.Insert 610nm between 590nm and 630nm, make the peak wavelength of chip light emitting reduce to 20nm from 40nm at interval, these light all can overlap the interval that 30nm is arranged between 560nm and the 590nm at 1/2 power place.The overlapping power of light can be more lower slightly, but overall nothing is influenced greatly, when 9 chips are simultaneously luminous, its spectral energy distribution curve has just seemed smoothly, the electrical power decision that total number of this led chip can be born by the power and the single chip of needs, this is that those skilled in the art can implement.
The size of the light-emitting diodes chip 5 in the foregoing description can be little, and 0.35mm * 0.35mm for example also can be with big, for example 1mm * 1mm or 1.5mm * 1.5mm, and the quantity of every kind of chip is decided by the watt level of the LED that needs are made.
With reference to figure 9, make high-color rendering LED lamp of the present invention.
This LED lamp is made light source with any light emitting diode 10 that the present invention makes, and this light emitting diode 10 is directly installed on radiator 12 tops, and the heat when making chip 5 work can dispel the heat rapidly; This radiator 12 is radiators that conventional LED lamp is used; When using a LED, when its luminous flux is not satisfied the demand, can be with a plurality of high-color rendering LED of the present invention, this is that those skilled in the art can implement.Around the LED be a taper reflection shield 3 ', reflection shield 3 ' and the angle of LED installed surface between 10 °～80 °; Reflection shield 3 ' inwall on also be provided with small embossment 4 ', can play the mixed light effect, and make the angle of emergent light satisfy instructions for use.The reflector of this taper also is fixed on the top of radiator (12).Radiator is made by high thermal conductivity materials, for example metal, material with carbon element, carbon fiber or other composite, and the radiator appearance is made fin structure, and as shown in Figure 9, cross-ventilation is good, the radiating efficiency height, the top size matches with the reflection shield that plays the mixed light effect.The lower end of radiator 12 is connected with a cup-shaped working of plastics 13, and working of plastics 13 volume inside are laid driving power 8, and working of plastics has guaranteed that enough good electric insulation is arranged between driving power and the radiator; The end of working of plastics 13 is electric connectors 9, and this electric connector 9 adopts conventional E27 or E14 screw socket, also can be both feet, the direct insertion lamp holder of multiway.This light emitting diode contacts by the screw on its base or screw hole and a radiator direct mechanical, the lead-out wire of this light emitting diode is electrically connected with a drive circuit, drive circuit is electrically connected suit one printing opacity cell-shell on described light emitting diode by its shell with electric connector.
Make a kind of room lighting LED plane light source of the present invention.
With reference to Figure 10, this room lighting is similar with LED plane light source and common LED plane light source, its difference is radiator for being that 2 or 4 reflecting walls are set on the heat sink, and described heat sink lower surface is a flap-like, the reflecting wall inner surface have kick 4 '; Above-mentioned any high-color rendering white-light light emitting diode 10 of the present invention, or 2 above high-color rendering white-light light emitting diodes 10 (according to luminous flux needs design LED number) are directly installed on the radiator upper surface; There is an electric interfaces 9 in the outside of reflection wall, is connected on the driving power, and described transparent cell-shell 11 is installed on the described reflection wall, becomes an independently face light emitting source; Described heat sink is positioned at planar light source or liquid crystal display with the back side of the LGP of back-illumination source and all around.Because the white light that LED sends from the end face outgoing, has passed through reflection repeatedly, so its emergent light is quite uniform after bottom and reflection all around.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and modification according to the present invention, but these corresponding changes and modification all should belong to the appended claim protection domain of the present invention.
Claims (10)
1. white light emitting diode with high-color rendering comprises: a heat conducting base, lead frame, reflector, 6 or 6 above light-emitting diode chip for backlight unit and transparent silica gel or epoxy resin; Wherein, described reflector is installed on the heat conducting base upper surface, and described light-emitting diode chip for backlight unit is installed on the interior heat conducting base of this reflector, and light-emitting diode chip for backlight unit top covers transparent silica gel or epoxy resin; It is characterized in that described reflector is the beaker flask of a bottom hollow out, and the kick of mixed light effect has been set on this reflector internal face; Described lead frame shape and size match with described reflector bottom, and this lead frame is installed in described reflector bottom outside, and is fixed on the upper surface of described heat-conducting base; Described 6 or 6 above light-emitting diode chip for backlight unit are 6 kinds, or the chip of output different colours light more than 6 kinds, each chip is at least one, with adjacent two chip light emitting peak wavelengths at interval at 35～20nm, be placed in and carry out electricity combination on the heat-conducting base, described electrode of light emitting diode is electrically connected with lead-in wire on the lead frame.
2. by the described white light emitting diode of claim 1 with high-color rendering, it is characterized in that, the wavelength of chip of described 6 kinds of output different wavelengths of light are respectively: 457nm blue light, wavelength 490nm blue green light, wavelength 525nm green glow, 560nm green-yellow light, 590nm is orange and wavelength 630nm ruddiness, and adjacent two peak wavelengths are at interval at 35nm-20nm; Be electrically connected between the chip of described 6 kinds of output different wavelengths of light, adopt the electrical connection of series, parallel or connection in series-parallel combination, be electrically connected with driving power with lead-out wire; Also comprise and divide several groups chip, each core assembly sheet is connected into one group, draws with lead-out wire respectively, and lead-out wire is used to connect driving power.
3. by the described white light emitting diode of claim 1 with high-color rendering, it is characterized in that the wavelength of the chip of described 9 kinds of output different wavelengths of light is respectively: 457nm, 465nm, 490nm, 515nm, 535nm, 560nm, 590nm, 610nm and 630nm; Wherein 9 kinds of light-emitting diode chip for backlight unit are divided into two groups, one group of 5 light-emitting diode chip for backlight unit series connection by wavelength 457nm, 535nm, 560nm, 465nm and 490nm; Another group is by 4 light-emitting diode chip for backlight unit series connection of wavelength 590nm, 630nm, 515nm and 610nm, and the two groups of chip of series connection is drawn by lead-out wire respectively, and lead-out wire is used to connect driving power separately.
4. by the described white light emitting diode of claim 1 with high-color rendering, it is characterized in that described heat conducting base is made flat pedestal, had the pedestal that screw rod, screw or other installing mechanism are arranged on the pedestal of radiating fin or the bottom surface by the material of metallic copper, aluminium or other high thermal conductivity; Described radiating fin is spirality radiating fin or the heronsbill shape radiating fin that has single or multiple spirals, or adopt a kind of radiating subassembly, this radiating subassembly is by a support of building with highly heat-conductive material, described support is a super heat-conductive pipe, metal tube or metal bar, described fin is set and fin composition under a group is set around this support at described top of the trellis; Wherein, described fin center has through hole, and its hole size is identical with the external diameter of described super heat-conductive pipe, metal tube or metal bar; The internal diameter of described superthermal conductance pipe or metal tube matches with screw rod, screw or other installing mechanism of the cooling base bottom surface of the light emitting diode that will install; A shell porous or netted that one usefulness insulating materials or metal are made is wrapped in outside the support, becomes one with support.
5. by the described white light emitting diode of claim 1, it is characterized in that described reflector is that the good material of copper, aluminum metallic material or other reflective function is made with high-color rendering.
6. by the described white light emitting diode of claim 1 with high-color rendering, it is characterized in that, described kick is the spherical surface body of an any surface finish, the kick diameter is the same or different, and its arrangement mode is that array, interlacing dislocation arrangement or this kick are by the downward descending arrangement of reflective rim of a cup.
7. the white led lamp bubble that application rights requires 1 described white light emitting diode with high-color rendering to make comprises: at least one white light emitting diode, printing opacity cell-shell, radiator, drive circuit, electric connector and transparent silica gel or epoxy resin; It is characterized in that described reflection shield is the beaker flask of a bottom hollow out, and on this reflection shield internal face, small embossment is set; This reflection shield is installed in described radiator top; Described white light emitting diode is installed in the reflection shield center, and the lower surface of this white light emitting diode is close on the described radiator; Described radiator adopts fin formula structure, and size matches with reflector; The electrode of described white light emitting diode is drawn from lead frame, is connected with driver with lead, and the lower end of radiator is connected with a cup-shaped working of plastics, and the working of plastics volume inside is laid driving power; The end of working of plastics is an electric connector.
8. by the described white led lamp bubble of claim 7, it is characterized in that described electric connector is a lamp screw base, normally press the E27 or the E14 screw socket of international uniform; Or lamp holder double-legged, the multiway straight cutting.
9. press the room lighting LED plane light source that the described white light emitting diode of claim 7 is made, it is characterized in that, described printing opacity cell-shell is the cell-shell of glass or plastics transparent, the painted or diffusion of making, or on the described printing opacity inner wall light-converting material layer is arranged.
10. the room lighting LED plane light source that application rights requires 1 described white light emitting diode with high-color rendering to make comprises: at least one light emitting diode, radiator, drive circuit, electric connector and transparent cell-shell; It is characterized in that, described radiator is that 2 or 4 reflecting walls are set on the heat sink, described heat sink lower surface is a flap-like, the reflecting wall inner surface has kick, the outside of reflection wall has one to be electrically connected jack, be connected on the driving power, described transparent cell-shell is installed on the described reflection wall, becomes an independently face light emitting source; Perhaps 2 above LED plane combination of light sources are got up; Described light emitting diode is the white light emitting diode with high-color rendering.
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| CN200910098188A CN101881381B (en) | 2009-05-05 | 2009-05-05 | White light emitting diode and white light emitting diode lamp |
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| CN200910098188A CN101881381B (en) | 2009-05-05 | 2009-05-05 | White light emitting diode and white light emitting diode lamp |
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