CN202120981U - Led display - Google Patents
Led display Download PDFInfo
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- CN202120981U CN202120981U CN201120189687XU CN201120189687U CN202120981U CN 202120981 U CN202120981 U CN 202120981U CN 201120189687X U CN201120189687X U CN 201120189687XU CN 201120189687 U CN201120189687 U CN 201120189687U CN 202120981 U CN202120981 U CN 202120981U
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- emitting diode
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Abstract
The present utility model relates to an LED display. The LED display comprises a plurality of LED packages, each LED package is provided with a horizontal emission angle and a vertical emission angle, at least parts of the LED packages are provided with horizontal emissions angles which are larger than vertical emission angels, and each LED package is provided with a reflection coating. According to the LED display, the peak value emission of the LED packages can present the improved emission characteristic, and the LED display can obtain the improved emission characteristic, such as wider far field graph. When the display is watched from different visual angles, the improved image intensity and quality can be provided.
Description
Technical field
The utility model relates to light-emitting diode (LED) and encapsulates and utilize the display of LED package as its light source.
Background technology
Light-emitting diode (LED or LEDs) is the solid state device that converts electrical energy into light, and it comprises one or more active layer that is clipped in the semi-conducting material between the opposite doped layer usually.When the above-mentioned doped layer of leap applied bias voltage, hole and electronics were injected into active layer, and hole and electron recombination are to produce light there.Light is launched from all surface of active layer and LED.
At last decade or more over a long time, scientific and technological progress has made LED have littler taking up room (footprint), the emission effciency that improves and the cost of reduction.Than other reflector, LED also has the working life of prolongation.For example, the working life of LED can surpass 50,000 hours, and the working life of incandescent lamp bulb is approximately 2,000 hours.LED is also can be than other light source more sturdy and durable and consume still less energy.Owing to these and other reason, LED is more popular and in the traditional field of increasing white heat, fluorescence, halogen and other reflector is used, use at present.
In order in conventional use, to use led chip, be known that with led chip pack into the encapsulation in so that environment and/or mechanical protection, color selection, optically focused etc. to be provided.LED encapsulation also comprises and is used to be electrically connected electrical lead, contact or the trace that LED is packaged into external circuit.In typical LED encapsulation/parts 10 shown in Figure 1, single led chip 12 is installed on the reflector 13 through solder bonds or conductive epoxy resin.The ohmic contact that or more closing lines (wire bond) 11 connects led chips 12 is to 15A and/or the 15B of going between, and lead-in wire 15A and/or 15B can be attached to reflector 13 or integrated with reflector 13.Reflector 13 can be able to be contained sealant material 16 fillings of material for transformation of wave length (like phosphor).Phosphor can absorb LED emission first wavelength light and spontaneously launch the light of second wavelength.So whole assembly can be installed in the transparency protected resin 14, it can be molded to lens shape.And reflector 13 can be on the direction that makes progress direct light, when the light reflex time possibly take place optical loss (promptly since actual reflector surface less than 100% reflectivity, some light cup that possibly be reflected absorbs).In addition, for the encapsulation of encapsulation as seen in fig. 1 10, heat retention (heat retention) possibly be a problem, draws heat because possibly be difficult to through lead-in wire 15A, 15B.
Different LED encapsulation, as shown in Figure 1 those, no matter large or small, can use as the light source of display.In many indoor and outdoor occasions, for example in the stadium, horse-racing ground, concert and in large-scale public area, like the Times Square of New York City, the LED-based display of large-screen (often being called huge screen) becomes more general.In these displays or the screen some can be that 60 feet high and 60 feet wide that kind are big.These screens can comprise thousands of " pixels " or " picture element module ", its each can comprise a plurality of LED.Picture element module can use high efficiency, high-brightness LED, these LED allow displays from remote relatively be visible, even daytime is under the condition of daylight.Picture element module can have LED few as 3 or 4 (ruddiness, a green glow and a blue light), and this allows pixel from the combination of red, green and/or blue light, to launch the light of many different colours.In the huge screen of maximum, each picture element module can have tens LED.These picture element modules are set to rectangular mesh.In one type display, this grid can be 640 wide and 480 module height of module, and the size of screen depends on the actual size of picture element module.
The most traditional LED-based display through accepting input signal (for example TV signal) computer system control and be based on particular color required in this picture element module and form whole display image, which LED of this computer system decision in each picture element module is luminous and how brightly send out.Also can comprise power-supply system, its power to each picture element module is provided and provide to the power of each LED can be modulated so that the brightness that its emission is required.Provide conductor to apply each LED in suitable power signal to the picture element module.
Light-emitting diode display seldom is installed in the height of beholder's sight line, and the more typical top that is mounted in height of sighting line, for example in the side of building or the sports ground on the top of main stand.With reference now to Fig. 2,, shown traditional light-emitting diode display 20 is installed in the position of the top rising of beholder's 22 height of sighting lines.Beholder 22 typically is positioned at the below of display 20 and upwards watches display to make the Vertical Launch direction 26 of beholder to the sight line 24 of display 20 to display be angle θ.The light-emitting diode display of Fig. 2 typically comprises a plurality of reflectors 28 such as shown in Figure 1 those, and these reflectors present typically the peak emission along the encapsulation longitudinal axis, and the contiguous center of peak emission.
Make display comprise the vertical show peak emissions characteristic that a plurality of LED encapsulation 28 can obtain on vertical direction 26, as directed.The Iv of light-emitting diode display 20 and far field pattern (FFP) peak emission characteristic can be perpendicular to the demonstrations along vertical axis 26.When display 20 was installed in raised position, beholder's sight line 24 was lower than vertical line, was seen and was slatterned by most light persons of not being observed of display emission.Also there is this situation when the display side in the beholder below display.A kind of method of the light quantity that cuts the waste is through on the angle of better coupling observer sight line 24, display being installed, but it needs complicated with expensive mounting hardware, and this mounting hardware is difficult to use, especially for the huge display that is installed in high height above sea level.
The beholder when watching not often directly in LED-based display front.According to the residing position of beholder, the horizontal view angle can be different.And when physiognomy moved light-emitting diode display, for example stroll can be watched in the varying level angle.Typically, the light-emitting diode display that has a peak emission at contiguous center possibly experience the minimizing of emissive porwer in the varying level angle.The far field pattern (FFP) of the different LED encapsulation of each pixel also can be different, make that light-emitting diode display possibly experience the picture quality variation when watching from different perspectives.
The utility model content
What the utility model was directed against is LED encapsulation and use LED encapsulated LED display, the LED encapsulation wherein is set so that the emission of wide angle level to be provided.This causes light-emitting diode display to present the for example emission characteristics of the improvement of wide angle far field pattern (far field pattern).Scope also can present the picture quality of improvement to light-emitting diode display in the vertical angle of view.The LED encapsulation also can comprise provides the characteristic of operation more reliably.
According to a plurality of LED encapsulation of one embodiment comprises of the light-emitting diode display of the utility model, wherein each has the horizontal angle of departure and Vertical Launch angle.The horizontal angle of departure is bigger than Vertical Launch angle in the said LED encapsulation of in display, using at least some.
According to the lead frame that embeds sealant at least in part that one embodiment comprises of the LED of the utility model encapsulation, wherein lead frame comprises the reflector of LED.Reflector and sealant are set to make from the LED light of LED encapsulation emission at the angle of departure of first direction greater than the angle of departure in second direction.
Another embodiment according to the light-emitting diode display of the utility model comprises a plurality of LED encapsulation, its each have the horizontal angle of departure and Vertical Launch angle.The horizontal angle of departure makes light-emitting diode display produce the horizontal far field pattern wideer than its vertical far-field pattern greater than the Vertical Launch angle in said LED encapsulation at least some.
Another embodiment according to the light-emitting diode display of the utility model comprises a plurality of pixels, its each comprise a plurality of LED encapsulation of emission different colours light.Each LED encapsulation has the horizontal angle of departure and Vertical Launch angle, and the wherein horizontal angle of departure is greater than the Vertical Launch angle.The emission pattern of each LED encapsulation at different vertical visual angle is basic identical in the angular field of view.
An aspect according to the utility model provides a kind of light-emitting diode display; It comprises: a plurality of LED encapsulation; Each LED encapsulation has the horizontal angle of departure and Vertical Launch angle; Wherein the horizontal angle of departure described at least some in said LED encapsulation is greater than said Vertical Launch angle, and wherein, each LED encapsulation all has reflectance coating.
Further, each in said at least some LED encapsulation comprises oval reflector.
Further, said oval reflector is longer in one direction, and said is horizontal aligument than length direction.
Further, each in said at least some LED encapsulation comprises the reflector with LED, and said reflector has the lateral reflection surface of the emission characteristics that is arranged to mate said LED.
Further, each said reflector has the reflection opening, compares with the reflector of the body emission LED with similar size, and this reflection opening is bigger as far as body emission LED.
Further, at least some in the said reflector comprise the body emission LED with 80 ° or bigger reflection opening.
Further, at least some in the said reflector comprise the body emission LED of the reflection opening with 100 °.
Further, at least some in the said reflector comprise the top-emission LED with 60 ° or bigger reflection opening.
Further, at least some in the said reflector comprise the top-emission LED of the reflection opening with 80 °.
Further, each said reflector has reflective side surfaces, compares with the reflector of the body emission LED with same size, and said reflective side surfaces is higher for top-emission LED.
Further, it is higher more than 50% than the reflective side surfaces of the reflector of the body emission LED with same size to have a reflective side surfaces that the said reflector of top-emission LED has.
Further, each in said at least some LED encapsulation comprises the ovaloid seal agent.
Further, each in said at least some LED encapsulation has in one direction than sealant wide on other direction, and it is horizontal aligument that the sealing agent is set to than cross direction.
Further, in said at least some LED encapsulation said each comprise the reflector that embeds in the sealant, the promotion angle of departure that said reflector is arranged in the said sealant surpasses 90 ° some place.
Further, said LED encapsulation further comprises reflector radiator and closing line radiator, and each in said reflector radiator and the said closing line radiator has the thermal resistance less than 190K/W.
Further, said light-emitting diode display comprises the screen emission pattern that has greater than 90 ° horizontal far-field emission pattern.
Further, said light-emitting diode display comprises the screen emission pattern of the horizontal far-field emission pattern with 115 °.
According to the utility model a kind of LED encapsulation is provided; It comprises: embed the lead frame in the sealant at least in part; Wherein said lead frame comprises the reflector with LED, and wherein said reflector and said sealant are arranged to make LED light to launch from said encapsulation with certain angle of departure along first direction, and this is launched greater than the emission along second direction; Wherein, reflector has reflectance coating.
Further, said first direction is perpendicular to said second direction.
Further, said LED encapsulation is installed in the light-emitting diode display, and said first direction is that second direction level and said is vertical.
Further, each said reflector is oval-shaped.
Further, said LED encapsulation further is included in the body emission LED in the said reflector, and said reflector has 80 ° or bigger reflection opening.
Further, said reflector has about 100 ° reflection opening.
Further, said LED encapsulation further is included in the top-emission LED in the said reflector, and said reflector has 60 ° or bigger reflection opening.
Further, said LED encapsulates said reflector and has about 80 ° reflection opening.
Further, said sealant is oval-shaped.
Further, said sealant is oval-shaped and on first direction, is wider than the direction vertical with said first direction that said LED encapsulation is installed in the light-emitting diode display and first direction is horizontal aligument.
Further, in said at least some LED encapsulation said each comprise the reflector that embeds sealant, said reflector is arranged on the some place of the promotion angle of departure above 90 ° in the said sealant.
According to the utility model a kind of LED encapsulation is provided, it comprises: have the lead frame of reflector part, this reflector partly has reflector and LED; Said lead frame further comprises the closing line part; Said reflector partly comprises the reflector radiator, and said reflector radiator is set for the heat that diffusion is produced by said LED, and said radiator is dimensioned to have the thermal resistance less than 180K/W; Wherein, said reflector has reflectance coating.
Further, said LED encapsulation further comprises the closing line radiator, and it is integrated into said closing line part and is dimensioned to have the thermal resistance less than 180K/W.
Further, said reflector radiator is dimensioned to have the thermal resistance less than 120K/W.
Further, said closing line radiator is dimensioned to have the thermal resistance less than 120K/W.
Further, said LED encapsulation further comprises sealant, in said sealant, embeds said lead frame, and wherein said lead frame is patterned so that the bonding between said sealant and the said lead frame to be provided.
One side again according to the utility model provides a kind of light-emitting diode display; It comprises: a plurality of LED encapsulation; Each LED encapsulation has the horizontal angle of departure and Vertical Launch angle, and wherein the horizontal angle of departure is greater than said Vertical Launch angle described at least some in said LED encapsulation, and the horizontal far field pattern that wherein said light-emitting diode display produces is wider than its vertical far-field pattern; Wherein, each LED encapsulation all has reflectance coating.
One side again according to the utility model provides a kind of light-emitting diode display; It comprises: a plurality of pixels, each pixel include a plurality of LED encapsulation of the light of emission different colours, and each said LED encapsulation all has the horizontal angle of departure and Vertical Launch angle; The wherein said horizontal angle of departure is greater than said Vertical Launch angle; The different vertical visual angle place of the emission pattern of each said LED encapsulation in angular field of view is identical, and wherein, each LED encapsulation all has reflectance coating.
Further, said angular field of view is 0 to 30 °.
According to the LED encapsulation and the employing LED encapsulated LED display of the utility model, wherein the peak emission of light-emitting diode display can present the emission characteristics of improvement.The characteristic of improving comprises that it makes light-emitting diode display obtain the for example emission characteristics of the improvement of the far field pattern of broad according to the horizontal emission angle of broad of the LED encapsulation of the utility model.When it provides the image intensity and the quality of improvement when display is watched at the varying level visual angle.Also provide when when different vertical angles are watched, the LED encapsulation has the emission characteristics of the improvement of emission different colours light.
These of the utility model and others and advantage will be from subsequently to become obvious the detailed description of the characteristic of Examples set the utility model and the accompanying drawing.
Description of drawings
Fig. 1 is traditional LED package;
Fig. 2 is the sketch map that the typical visual angle of some light-emitting diode displays is shown;
Fig. 3 is the top view according to an embodiment of the lead frame of the utility model;
Fig. 4 is the end view of lead frame shown in Figure 3;
Fig. 5 is the top view according to another embodiment of the lead frame of the utility model;
Fig. 6 is the end view of lead frame shown in Figure 5;
Fig. 7 is the end view according to an embodiment of reflector of the utility model and sealant;
Fig. 8 is the top view according to an embodiment of the sealant of the utility model;
Fig. 9 is the end view of sealant shown in Figure 8;
Figure 10 is the opposite side view of sealant shown in Figure 8;
Figure 11 is the curve chart that illustrates according to the level emission pattern of an embodiment of the LED of the utility model encapsulation;
Figure 12 is the curve chart that illustrates according to the Vertical Launch pattern of the LED of the utility model encapsulation;
Figure 13 illustrates conventional lead frame;
Figure 14 illustrates an embodiment according to the lead frame of the utility model;
Figure 15 illustrates another embodiment according to the lead frame of the utility model;
The another embodiment that topic 16 illustrates according to the lead frame of the utility model;
Figure 17 illustrates the curve chart according to the level emission pattern of an embodiment of the light-emitting diode display of the utility model;
Figure 18 illustrates the curve chart according to the Vertical Launch pattern of the light-emitting diode display of the utility model;
Figure 19 illustrates the angular field of view of light-emitting diode display;
Figure 20 illustrates the curve chart that is encapsulated in 0 ° emission pattern according to the red and green LED of the utility model;
Figure 21 illustrates the curve of penetrating pattern that is encapsulated in 15 ° according to the red and green LED of the utility model
Figure;
Figure 22 illustrates the curve chart that is encapsulated in 30 ° emission pattern according to the red and green LED of the utility model.
Embodiment
What the utility model was directed against is LED encapsulation and employing LED encapsulated LED display, and wherein the peak emission of light-emitting diode display can present the emission characteristics of improvement.In certain embodiments, the characteristic of improvement comprises that it makes light-emitting diode display obtain the for example emission characteristics of the improvement of the far field pattern of broad according to the horizontal emission angle of broad of the LED encapsulation of the utility model.When it provides the image intensity and the quality of improvement when display is watched at the varying level visual angle.Various embodiment also provides when when different vertical angles are watched, and the LED encapsulation has the emission characteristics of the improvement of emission different colours light.In one embodiment, the different vertical visual angle that is encapsulated in a certain scope of red and green LED also has essentially identical emission pattern.This helps at the color that these angular display units appear is consistent.
In having the LED encapsulated LED display of unique size and setting, can obtain the emission characteristics of these improvement.The geomery and the shape of the height of lead frame and the agent of LED potting in these optical designs, the potting agent including, but not limited to reflector.Encapsulation also can have through the different operating temperature and makes the more reliable a plurality of characteristics of encapsulation according to the LED of the utility model.These characteristics can comprise that the heat that LED is produced provides the lead frame size of improving heat radiation.Lead frame also can be provided with rough surface, and it provides the bonding of the improvement between lead frame and the sealant.
The combination of above-mentioned characteristic provides light-emitting diode display to have more operation reliably and the emission characteristics of the improvement of the light-emitting diode display watched from varying level and vertical angle.
A plurality of different embodiment according to the utility model are described below, and it provides required emission characteristics, but should be appreciated that these characteristics can provide with the different modes that surpasses those modes described herein.Some following LED encapsulation embodiment describe about the horizontal angle of departure of broad, but should be appreciated that the utility model also can be used for providing the LED encapsulation that also can be arranged to provide bigger Vertical Launch angle.Also can understand the different visual angles that describes below only is the representative of available different visual angles among the different embodiment.Although described the embodiment of display, also can understand and to use many dissimilar reflectors, and the use of this term means and comprise all soild state transmitters, for example LED, led chip and laser diode about LED encapsulation.LED encapsulation described herein has single led, but should be appreciated that they can have more than a LED.LED encapsulation according to the utility model also can have the difference installation setting of installing in the display, for example lead-in wire or mounted on surface setting.
Here describe the utility model about specific embodiment, but should be appreciated that the utility model can be multi-form comes practical implementation should not be interpreted as to be confined to here the embodiment that is set forth.Especially can provide to surpass above-described those many different LED, reflector and lead frame setting, and sealant can provide and improves reliability and from the emission characteristics and a plurality of characteristics of using LED encapsulated LED display of LED encapsulation.Although what the different embodiment of the LED of following discussion encapsulation were directed against is the use in light-emitting diode display, they can individually or be used for multiple other with other LED encapsulation with identical or different peak emission inclination (tilt) and use.
Also will be understood that, when element for example layer, zone or substrate be called as another element " on " time, it can be directly on another element or also, can have intervenient element.In addition, can use relative term here, for example " inner ", " outside ", " top ", " top ", " bottom ", " following " and " ... under " and similar term one deck or another regional relation are described.Will be understood that these terms are intended to comprise the different orientation of device the orientation of in figure, describing.
Although first, second grade of term can be used to describe various elements, parts, zone and/or part here, these terms will not limit these elements, parts, zone and/or part.These terms only are used to distinguish an element, parts, zone or part and another element, parts, zone or part.Therefore, first element that is discussed below, parts, zone or part can be called second element, parts, zone or partly not depart from the instruction of the utility model.
Here describe the embodiment of the utility model with reference to sectional view, wherein sectional view shows the illustrative diagram of the embodiment of the utility model.According to this, the actual (real) thickness of parts can be different, and owing to for example manufacturing technology and/or tolerance limit, can expect to change illustrated shape.The embodiment of the utility model will be not interpreted as the given shape in the zone that is confined to illustrate here, but owing to the reason of for example making comprises departing from shape.Typically, because the manufacturing tolerance limit of standard, diagram or square or the rectangular area described will have circle or arc characteristic.Therefore the zone shown in the figure is actually schematically, and their shape is not intended to explain the accurate shape in the zone of device, and also is not intended to limit the scope of the utility model.
As stated, the LED encapsulation that has a design of unique reflector through use can obtain the emission characteristics according to the improvement of the light-emitting diode display of the utility model at least in part.In certain embodiments, reflector can have to the different angles of its side surface and the elliptical shape of height, is installed in the emission characteristics and the structure of the led chip in the reflector with coupling.For example, than the reflector that is used for mainly sending from top surface the LED (being top-emission LED) of light, reflector can have different angles and size, is used for sending from all surface the LED (being body emission LED) of light.Reflector can have reflectance coating.
Fig. 3 and 4 illustrates an embodiment according to the LED encapsulation 50 of the utility model, in the sealant that this LED encapsulation 50 typically is embedded in like epoxy resin.For convenience, under not having the situation of sealant, illustrate LED encapsulation 50 with below embodiment.Encapsulation 50 comprises the lead frame 52 with reflector 54, and LED 56 is installed in the pedestal place of reflector 54.Lead frame 52 can use known manufacturing methods to be processed by traditional material.Can the signal of telecommunication be applied to LED 56 through the first lead portion 52a and the second lead frame part 52b, the closing line (not shown) passes between the second lead frame part 52b and the LED 56 the signal of telecommunication is carried to LED 56.
Many dissimilar LED can be used in the encapsulation 50.The manufacturing of tradition LED is normally known, and only briefly discusses here.Can use known technology to make LED, and a kind of suitable manufacturing process is to use Organometallic Chemistry gas deposition (MOCVD).The layer of LED generally includes the active layer/district that is clipped between the first and second opposite doped epitaxial layers, and its all these be to be formed on the growth substrates continuously.Led chip can be formed on the wafer, then by singulation to be installed in the encapsulation.Be appreciated that growth substrates can be used as final singulation LED a part and keep or growth substrates can be removed whole or in part.
Be further appreciated that in LED 56, to comprise other layer and element, include but not limited to resilient coating, nucleating layer, contact layer and current extending, and light-extraction layer and element.Active area can comprise single quantum well (SQW), MQW (MQW), double heterojunction or superlattice structure.Active area and doped layer can be made by the different materials system, and the preferable material system is an III nitride material system.The III group-III nitride refers to the semiconducting compound that forms between those elements (normally aluminium (Al), gallium (Ga) and indium (In)) in the III of nitrogen and periodic table family.This term also relates to ternary and quaternary compound, like aluminum gallium nitride (AlGaN) and aluminium indium gallium nitrogen (AlInGaN).In a preferred embodiment, doped layer is that gallium nitride (GaN) and active layer are InGaN.In alternative embodiment, doped layer can be AlGaN, gallium aluminium arsenic (AlGaAs) or Al-Ga-In-As phosphorus (AlGaInAsP).
Growth substrates can be processed by a lot of materials, and like sapphire, carborundum, aluminium nitride (AlN), gallium nitride (GaN), suitable substrate is a 4H polytype carborundum, yet also can use other carborundum polytype that comprises 3C, 6H and 15R polytype.Carborundum has some advantage, as comparing lattice match with sapphire more near the III group-III nitride, and causes producing and has higher-quality III nitride films.Carborundum also has very high thermal conductivity so that the gross output of the III nitride devices on the carborundum can not limited (situation that is formed on some devices on the sapphire possibly be like this) by the heat radiation of substrate.The SiC substrate can be from the North Carolina Cree Research, Inc of Du Lun obtain, and about the method for making them in scientific literature with United States Patent (USP) No.Re.34, stated in 861, No.4,946,547 and No.5,200,022.
LED also can comprise the closing line pad on conduction current expansion structure and the top surface, and they are all processed by electric conducting material, and electric conducting material can use known method to deposit.Some materials that can be used for these elements comprise Au, Cu, Ni, In, Al, Ag or their combination and conductive oxide and transparent conductive oxide.Current-dispersing structure can be included in the conductive fingers that is arranged to grid on the LED 56, and these finger pieces are spaced apart to strengthen from filling up the current expansion of LED top surface.In operation, the signal of telecommunication that is described below is applied to pad through closing line, and finger piece and the top surface of the signal of telecommunication through current-dispersing structure propagates among the LED.Current-dispersing structure but also can be used for the n type material in being commonly used in the LED that top surface is the p type.
Some or all LED described herein can with one or more polyphosphor apply, phosphor absorbs at least some LED light and launches the light of different wave length, so that the LED emission is from the combination of the light of LED and phosphor.In an embodiment according to the utility model, white luminous LED has the LED and the phosphor absorption portion blue light of the light of emission blue wavelength spectrum and also launches gold-tinted again.The white light combination of LED emission blue light and gold-tinted.In other embodiments, United States Patent(USP) No. 7,213 as mentioned above, that kind described in 940, the non-white light combination of led chip emission blue light and gold-tinted.In certain embodiments, phosphor comprise can commercial acquisition YAG:Ce, yet adopt by based on (Gd, Y)
3(Al, Ga)
5O
12: the Ce system is (like Y
3Al
5O
12: the conversion particles that phosphor Ce (YAG)) is processed, FR wide yellow spectrum emission is possible.Other yellow phosphor that can be used for white luminous led chip comprises: Tb
3-xRE
xO
12: Ce (TAG); RE=Y, Gd, La, Lu; Or Sr
2-x-yBa
xCa
ySiO
4: Eu.
The LED of red-emitting can comprise the LED structure and material that allows ruddiness directly to launch from active area, for example pink AlInGaP LED.Replacedly, in other embodiments, emitting red light LED can comprise the LED of the phosphor covering that is absorbed LED light and red-emitting.LED can launch blue light or UV light, and some phosphors that are suitable for these structures can comprise: Lu
2O
3: Eu
3+(Sr
2-xLa
x) (Ce
1-xEu
x) O
4Sr
2-xEu
xCeO
4SrTiO
3: Pr
3+, Ga
3+CaAlSiN
3: Eu
2+And Sr
2Si
5N
8: Eu
2+
Can adopt many distinct methods to apply LED with phosphor; In sequence number is No.11/656; 759 and No.11/899; Described a kind of suitable method in 790 the U.S. Patent application, the utility model title of these two patent applications all is " Wafer Level Phosphor Coating Method and Devices Fabricated Utilizing Method ", and the two is merged in here by reference.Replacedly; Can use other method to apply LED; Like electrophoretic deposition (EPD); The U.S. Patent application No.11/473 that is called " Close Loop Electrophoretic Deposition of Semiconductor Devices " in the utility model name has described a kind of suitable EPD method in 089, and it is also incorporated into here by reference.Should be appreciated that a plurality of LED that also can have different colours according to the LED encapsulation of the utility model, one or more can be white luminous.
According to an aspect of the utility model, reflector 54 can have different size to mate the emission characteristics of its specific LED.In the embodiment shown, reflector 54 has the size of the most suitable body emission LED.Body emission LED is meant the LED that launches from all surface of LED from the light of active area.The different LED of light of emission different colours can be the body emission, for example conventional blue or green LED, and wherein some can be covered by phosphor as previously mentioned.Height and the angle that is suitable for body emission LED can be arranged to have in the side of the reflecting surface 58 of reflector 54.
In the embodiment shown, reflector 54 is the oval LED encapsulation emission that has the broad angle of departure with promotion.When reflector 54 when watching at first direction than long in second vertical direction.Reflector 54 also has lower surface 60, and it is longer than the second vertical direction 60b on first direction 60a.In one embodiment, first direction 60a is longer by approximate 10% or more on length than the second vertical direction 60b.In other embodiments, first direction 60a length is than the second vertical direction 60b long 20% or more.In other embodiments, first direction 60a can be than vertical direction 60b long 30% or more.In one embodiment, first direction is approximately 0.9mm and vertical direction is approximately 0.65mm.
The size that is appreciated that reflector also can be depending on other factors.Different size lens or sealant can limit the size of specific reflection cup.If reflector is too big for specific sealant, then it maybe be too near from encapsulant surface, and it possibly present the danger of breaking.The LED of different size also can influence the size of reflector.If than the LED size, reflector is too little, when in reflector, LED being installed, will be difficult to carry out so.
The reflector 54 of illustrated embodiment can be set to reflect the effective emission that helps display from most of light of body emission LED 56 so that from the light of LED.In the embodiment shown, lateral reflection surface 58 can be higher than the top surface of LED 56.In one embodiment, the height of the side surface on the top surface of LED 56 can be LED 56 total heights 50% or more.In other embodiments, the height of the side surface 58 on the top surface of LED 56 can be LED 56 total height 30% or higher.In other embodiments, the height of the side surface on the top surface of LED 56 can be LED 56 total height 10% or higher.In one embodiment, led chip can have the height 62 greater than about 0.05mm, and in another embodiment greater than about 0.10mm.Reflecting surface can have the height of approximate 0.15mm in one embodiment, and LED has the height of approximate 0.10mm.
Reflector also can have reflection opening 64, and it is measured as the angle between the relative reflecting surface.Reflect opening in certain embodiments and can be approximately 80 ° or more, and it can be approximately 90 ° or more in other embodiments.In an illustrated embodiment, reflection opening 64 can have approximate 100 ° angle, can be of different sizes and angle yet can understand reflector.
Fig. 5 and 6 illustrates another embodiment according to the LED encapsulation 70 of the utility model, and it has with LED encapsulation 50 similarly oval, and comprises similar lead frame 72 and reflector 74, and LED76 is installed to the lower surface 80 of reflector 74.LED 76 is top-emission in this embodiment, means from the major part emission of LED 76 to penetrate from its top surface.Be similar to top embodiment, lower surface 80 is oval and is growing on than its vertical direction 80b on the direction 80a.In one embodiment, the difference of these length can be 10,20 or 30% or more as stated, and can be approximately 0.9mm in one embodiment and take advantage of 0.65mm.
Yet the lateral reflection surface 78 of reflector 74 can have the size of the emission characteristics that is more suitable for top-emission LED.Compare with the height of LED 76, lateral reflection surface 78 can have the more light that the height higher than the reflector of body emission LED launched from the top surface of LED with reflection.In one embodiment, the height of the side surface 78 on the top surface of LED 76 can be LED 76 total height 150% or more.In other embodiments, the height of the side surface 78 on the top surface of LED 76 can be LED 76 total height 100% or more.In other embodiments, the height of the side surface 78 on the top surface of LED 76 can be LED 76 total height 50% or more.In the embodiment shown, for the LED 76 of the height with approximate 0.10mm, the height 82 on lateral reflection surface 78 can be approximated to be 0.25mm.
Be similar to top embodiment, reflector 74 can have reflection opening 84, and it is measured as the angle between the relative reflecting surface.The reflection opening can be different from required direction, to catch and the more light that guides again from LED because of top-emission LED.In certain embodiments, reflection opening 84 can be approximately 60 ° or more, and can be approximately 70 ° or more in other embodiments.In the embodiment shown, reflection opening 84 can have approximate 80 ° angle, yet is appreciated that reflector can be of different sizes and angle.
Can understand reflector according to the utility model and can have the size that depends on its LED and the different size of emission characteristics.The coupling of this reflector size, for example reflecting surface height and reflection opening to mate specific LED, can be the FFP that improves and mate the visual angle width of whole display and mate the different LED type and make allowances.
Shape and size according to the reflector of the utility model help lend some impetus to the similar emission characteristics of descending LED encapsulation emission with great visual angle and also promoting to have the LED encapsulation of different LED type.Just, the different LED type has different reflector settings, and the emission pattern that similar light quantity can be mated basically is reflected.
LED encapsulation according to the utility model also has other characteristic and size, and it helps lend some impetus to the emission under the wideer visual angle.Fig. 7 illustrates an embodiment according to the LED encapsulation 100 of the utility model, and it comprises reflector 102 and LED 104, and all these embeds in the sealant 108.The LED encapsulation also can comprise lead frame, and this figure has omitted this lead frame for the ease of description.In traditional LED encapsulation, reflector typically is arranged in sealant so that encapsulation provides the focused light of the relatively little angle of departure with the height of T1.By contrast, the reflector 102 in the LED encapsulation 100 is arranged in the sealant so that it is more near sealant top 106 at a higher T2.In certain embodiments, reflector 102 comparable existing encapsulation are high to 40%, and its comparable existing encapsulation is high to 20% in other embodiments.In other embodiments, its comparable existing encapsulation is high to 10% or more.
In certain embodiments, reflector 102 can have the distance from sealant top 106, this distance be sealant 108 total height 25% or still less.In other embodiments, reflector 102 can have the distance from sealant top 106, this distance be sealant 108 total height 35% or still less.In other embodiments, reflector 102 can have the distance from sealant top 106, this distance be sealant 108 total height 45% or still less.In the embodiment shown, height and the reflector 108 of sealant 108 with approximate 6.3mm is installed in the position that is positioned at the 106 approximate 2.2mm from the sealant top in the sealant 108.Leave closelyer based on reflector 102 and sealant top 108, it causes the angle of departure of LED encapsulation 100 bigger.
Different embodiment according to the utility model can have other structural change, the shape of sealant for example, its angle of departure of improving the standard.Fig. 8,9 and 10 illustrates another embodiment of LED encapsulation 120, and its sealant 122 only is shown.Sealant has the cross section of oval size to promote the emission of wide angle.Sealant 22 has the length bigger than second direction 122b on first direction 122a, second direction 122b is perpendicular to first direction 122a.First direction 122a can be than second direction 122b big 40% or more in certain embodiments.In another embodiment, it can big 30% or more, and in other embodiments, and it can big 20% or more.In one embodiment, at a some place of sealant main body, first direction 122a can be measured as 3.9mm and second direction 122b can be measured as the 3.0mm height.
In certain embodiments, sealant can use with the conventional circular reflector, and according to the elliptical shape of sealant, whole encapsulation has the wideer angle of departure.In other embodiments, sealant can use with the elliptical shape reflector, and these elliptical shape reflectors align with the elliptical shape of sealant to provide even wideer emission.In other embodiments, reflector can have different reflecting surface height and angle mating the emission of its LED, but its angle of departure of broadening encapsulation also.In other embodiments, reflector can be provided with De Genggao with the further broadening angle of departure in sealant.Be appreciated that encapsulation can have these characteristics according to the LED of the utility model various combination is to produce required emission width.
LED encapsulation according to the utility model can produce the emission with different emission width.In certain embodiments, the angle of departure can be greater than 90 ° and can be up to 120 °, and in other embodiments, it can be up to 140 °.Figure 11 illustrates an embodiment according to the horizontal far field pattern (FFP) 124 of the emission of an embodiment of the LED encapsulation of the characteristic with increase level emission width of the utility model.The characteristic of LED encapsulation produces approximate 115 ° the wide horizontal angle of departure.Figure 12 illustrates the Vertical Launch FFP 126 according to the LED encapsulation that does not have the characteristic that increases the Vertical Launch width of the utility model.Vertical Launch has approximate 65 ° FFP width.
Also can be set to have be the characteristic that operation reliably and the electric current that promotes and thermal level make allowances in encapsulation according to the LED of the utility model.In high electric current and high light flux are used, be installed in LED in the reflector and can produce and to expand to around the sealant of LED or enter into the heat of lead frame.The ability of operating under the higher current levels that is encapsulated in LED depends on that at least in part the encapsulation dissipation is from the ability of the heat of LED and lead frame is attached to sealant through temperature cycles ability.
With reference now to Figure 13,14 and 15,, compare with two embodiment according to the lead frame of the utility model, traditional LED package leadframe is shown.Figure 13 illustrates conventional lead frame 130, has reflector part 132 and closing line part 134, and wherein closing line is comprised the LED to the reflector.Reflector part 132 is included in the reflector radiator 136 of the expansion below it, and closing line part 134 is included in the closing line radiator 138 of the expansion below it.Reflector and closing line radiator 136,138 are set so that the surface area of increase to be provided, so that spread from LED from the heat that LED produces at run duration, so heat more is prone to loose in sealant on every side.
Figure 14 also illustrates the lead frame 140 according to the utility model, and it has reflector part 142, closing line part 144, reflector radiator 146 and closing line radiator 148.Yet in this embodiment, reflector radiator 146 is enlarged with thermal resistance that reduction is provided and is increased surface area more effectively to spread and to distribute the heat from LED.In an illustrated embodiment, reflector radiator 146 is wideer than in the conventional lead frame those, and some conventional lead frame have the width of approximate 0.9mm.In certain embodiments, wide 40% in the reflector radiator 146 comparable conventional lead frame or more.In other embodiments, the reflector radiator wide 30% in the comparable conventional lead frame of reflector radiator or more.In other embodiments, the reflector radiator wide 20% in the reflector radiator 146 comparable conventional lead frame or more.In the embodiment shown, the reflector radiator can have the width of approximate 1.25mm.Compare with conventional lead frame, the increase of this width can cause the minimizing (168 to 147K/W) of approximate 12.5% thermal resistance.Should be appreciated that other embodiment can have the reflector radiator of different size, and in other embodiments, closing line radiator 148 also can be wideer to improve thermal diffusion.
Figure 15 illustrates another embodiment according to the LED lead frame 150 of the utility model, and it also has reflector part 152, closing line part 154, reflector radiator 156 and closing line radiator 158.Yet in this embodiment, reflector radiator 156 is wide than in the conventional lead frame not only, and longer.This provides further thermal resistance to reduce, and surface area increases with more effectively heat radiation simultaneously.In one embodiment, the length of reflector dissipator has increased by 10% or more, and in other embodiments, this length can increase by 20% or more.In other embodiments, this length can increase by 30% or more.In an illustrated embodiment, the bottom of reflector radiator has increased 0.5mm and has been measured as 3.75mm from reflector top 152 partly.Length increase that should approximate 15% can cause the reduction (186 to 115K/W) of approximate 38% thermal resistance.In certain embodiments, only reflector radiator length in lead frame 150 increases.Yet the length that the length of closing line radiator 158 can also be same or different from reflector radiator 156 increases.This thermal resistance that reduces the closing line radiator similarly is with more effectively dissipate heat and heat dissipation.Although should be appreciated that the utility model of describing is that other size also can increase, for example thickness about the width that increases dissipator and length.
Each lead frame also can comprise the characteristic of the bonding of improvement and sealant, and it also improves reliability.Each comprised otch 160 of embodiment shown in Figure 14 and 15, it is arranged in the final LED encapsulation and keeps lead frame to sealant.Also can comprise other bonding characteristic.Figure 16 illustrates another embodiment according to the lead frame 170 of the utility model, and it also comprises reflector part 172, closing line part 174, reflector radiator 176 and closing line radiator 178.In this embodiment, the different characteristic of lead frame 170 can comprise surface roughening or impression characteristic 180, all of its covering lead frame 170 or some of them surface.Characteristic 180 can use many already known processes (for example metal stamping) to form.Through filling the sealant of characteristic 180 during making, characteristic 180 provides the bonding that increases between sealant and the lead frame 170 through temperature cycles.
Characteristic 180 can have multiple different size, and also can have same size maybe can have different size.They can be arranged in arbitrarily on the lead frame or can be at pattern.Characteristic 180 is provided in the analogous shape patterns of features, and these analogous shape characteristics can be included in the multiple diverse location and mainly be positioned in an illustrated embodiment on reflector radiator 176 and the closing line radiator 178.An embodiment of characteristic 180 can have general Pyramid, and pedestal is approximately 0.05mm and takes advantage of 0.05mm, and the degree of depth is approximately 0.03mm.The spacing that also can have approximate 0.10mm between the adjacent features.The dissipator that should be appreciated that impression characteristic and expansion can use or make up use separately so that LED encapsulation operation more reliably to be provided.
The light-emitting diode display that can be used for forming the LED demonstration of far field pattern according to the LED encapsulation of the utility model with improvement.Figure 17 illustrates the screen curve 190 of use according to the horizontal far field pattern of an embodiment of the LED encapsulated LED display of the utility model.Screen presents smooth emissive porwer characteristic basically in the 120 degree scopes of horizontal view angle.This provides watching of the improvement of light-emitting diode display in polarizers of big angle scope more, and at any viewing angle to 60 ° of vertical 0 ° of viewing angle and vertical any side, the LED image has essentially identical intensity.Thus, with traditional LED-based display in comparison, image keeps its quality in polarizers of big angle scope more.
Figure 18 illustrates the screen curve 200 of use according to the vertical far-field pattern of an embodiment of the LED encapsulated LED display of the utility model.Vertical pattern is followed more above-mentioned LED encapsulation and is used for not having lambert (Lambertian) pattern of display at the Vertical Launch angle of increase.Should be appreciated that in other embodiments some or all of LED encapsulation can be arranged to have higher vertical angle of view, and the vertical screen curve presents and is similar to flat shown in Figure 17.
Also can be presented on the emissive porwer Curve Matching of improving in the scope of vertical angle of view according to the use of the utility model according to the LED encapsulated LED display of having of the utility model above-mentioned all or some of them characteristic.Shown in figure 19, the beholder of light-emitting diode display can watch display from vertical angle (for example from display under special angle).In an illustrated embodiment, the vertical angle of view can be in 0 to 30 degree scope.For the more uniform images quality of these different visual angles is provided, the screen curve that coupling is provided according to the light-emitting diode display of the utility model be used for red, green and blue LED in the far field of these angles pattern.Figure 20 illustrates when at 0 ° or have the level emission pattern of the red and green LED encapsulation 212,214 of one of them a little above-mentioned characteristic when watching perpendicular to light-emitting diode display.The blue led encapsulation can have the emission pattern of the green LED of being similar to encapsulation and each pattern is basic and other pattern match.Figure 21 is illustrated in the emission pattern 222,224 of 15 ° of verticals angle of view according to the equal red of the utility model, green LED encapsulation.Although the amplitude of each can be lower than the pattern under 0 °, these patterns still mate basically.Figure 22 is illustrated in the emission pattern 232,234 of 30 ° of identical LED encapsulation, and the reduction of further emission amplitude, but launching curve still matees basically.
Curve among Figure 20 to 22 illustrates use can present the emission characteristics of basic coupling and different verticals angle of view according to the LED encapsulated LED display of the utility model.Although light intensity can increase and reduce along with the visual angle, kept the chromaticity of image through reflector with same transmit curve.
Display according to the utility model also can comprise different LED encapsulation combinations.Just, the encapsulation of the LED in the different displays need not have identical characteristic to increase emission angle.Although should be appreciated that and described the utility model about the horizontal emission angle of LED encapsulation, the utility model can be used to increase the Vertical Launch angle similarly.Similarly, light-emitting diode display can with the use that combines of LED encapsulation, these encapsulation have the characteristic of increase level and Vertical Launch angle.
LED encapsulation according to the utility model can be used for the multiple different illumination application except that light-emitting diode display, especially uses those application of the light source of small-sized high output, the angle of departure that it need increase.Some of them are including, but not limited to street lamp, building lighting, family and office lighting, display lighting and backlight.
Although describe the utility model in detail with reference to its some preferred structure, other pattern also is possible.Therefore, spirit of the utility model and scope should not be limited to above-described pattern.
Claims (17)
1. a light-emitting diode display is characterized in that, comprising:
A plurality of LED encapsulation, each LED encapsulation has the horizontal angle of departure and Vertical Launch angle, and wherein the horizontal angle of departure described at least some in said LED encapsulates is greater than said Vertical Launch angle,
Wherein, each LED encapsulation all has reflectance coating.
2. according to the light-emitting diode display of claim 1, it is characterized in that each in said at least some LED encapsulation comprises oval reflector.
3. according to the light-emitting diode display of claim 2, it is characterized in that said oval reflector is longer in one direction, should be horizontal aligument than length direction.
4. according to the light-emitting diode display of claim 1, it is characterized in that each in said at least some LED encapsulation comprises the reflector with LED.
5. according to the light-emitting diode display of claim 4, it is characterized in that each said reflector has the reflection opening.
6. according to the light-emitting diode display of claim 5, it is characterized in that at least some in the said reflector comprise the body emission LED with 80 ° or bigger reflection opening.
7. according to the light-emitting diode display of claim 5, it is characterized in that at least some in the said reflector comprise the body emission LED of the reflection opening with 100 °.
8. according to the light-emitting diode display of claim 5, it is characterized in that at least some in the said reflector comprise the top-emission LED with 60 ° or bigger reflection opening.
9. according to the light-emitting diode display of claim 5, it is characterized in that at least some in the said reflector comprise the top-emission LED of the reflection opening with 80 °.
10. according to the light-emitting diode display of claim 4, it is characterized in that each said reflector has reflective side surfaces.
11. the light-emitting diode display according to claim 10 is characterized in that, it is higher more than 50% than the reflective side surfaces that reflector had of the body emission LED with same size to have the reflective side surfaces that said reflector had of top-emission LED.
12. the light-emitting diode display according to claim 1 is characterized in that, each in said at least some LED encapsulation comprises the ovaloid seal agent.
13. the light-emitting diode display according to claim 1 is characterized in that, each in said at least some LED encapsulation has in one direction than sealant wide on other direction, and it is horizontal aligument that the sealing agent is set to than cross direction.
14. the light-emitting diode display according to claim 1 is characterized in that, in said at least some LED encapsulation said each comprise the reflector that embeds in the sealant, the promotion angle of departure that said reflector is arranged in the said sealant surpasses 90 ° some place.
15. light-emitting diode display according to claim 1; It is characterized in that; Said LED encapsulation further comprises reflector radiator and closing line radiator, and each in said reflector radiator and the said closing line radiator is sized to the thermal resistance that has less than 190K/W.
16. a light-emitting diode display is characterized in that, comprising:
A plurality of LED encapsulation, each LED encapsulation has the horizontal angle of departure and Vertical Launch angle, and wherein the horizontal angle of departure described at least some in said LED encapsulation is greater than said Vertical Launch angle, and wherein, each LED encapsulation all has reflectance coating.
17. a light-emitting diode display is characterized in that, comprising:
A plurality of pixels; Each pixel includes a plurality of LED encapsulation of the light of emission different colours, and each said LED encapsulation all has the horizontal angle of departure and Vertical Launch angle, and the wherein said horizontal angle of departure is greater than said Vertical Launch angle; Wherein, each LED encapsulation all has reflectance coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120189687XU CN202120981U (en) | 2010-11-19 | 2011-05-27 | Led display |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2010/001854 WO2011091569A1 (en) | 2010-01-29 | 2010-11-19 | Wide angle oval light emitting diode package |
| CNPCT/CN2010/001854 | 2010-11-19 | ||
| CN201120189687XU CN202120981U (en) | 2010-11-19 | 2011-05-27 | Led display |
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| CN202120981U true CN202120981U (en) | 2012-01-18 |
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| CN201120189687XU Expired - Lifetime CN202120981U (en) | 2010-11-19 | 2011-05-27 | Led display |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108321149A (en) * | 2017-01-18 | 2018-07-24 | 惠州科锐半导体照明有限公司 | Light emission diode package member and light emitting diode indicator |
| US11094852B2 (en) | 2017-08-25 | 2021-08-17 | Cree Huizhou Solid State Lighting Company Limited | Multiple LED light source lens design in an integrated package |
-
2011
- 2011-05-27 CN CN201120189687XU patent/CN202120981U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108321149A (en) * | 2017-01-18 | 2018-07-24 | 惠州科锐半导体照明有限公司 | Light emission diode package member and light emitting diode indicator |
| US11094852B2 (en) | 2017-08-25 | 2021-08-17 | Cree Huizhou Solid State Lighting Company Limited | Multiple LED light source lens design in an integrated package |
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Effective date of registration: 20210226 Address after: 516029 No.38, Hechang 6th Road East, Zhongkai high tech Zone, Huizhou City, Guangdong Province Patentee after: CREE HUIZHOU SOLID STATE LIGHTING Co.,Ltd. Address before: 516003 TCL Industrial Park, 21 Yunshan East Road, Jiangbei, Huizhou, Guangdong Patentee before: Cree Huizhou Opto Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |