CN202150227U

CN202150227U - Display

Info

Publication number: CN202150227U
Application number: CN2011201894164U
Authority: CN
Inventors: C·K·陈; Z·志宽; Y·K·刘; X·费; H·刘; J·圣; D·埃默森
Original assignee: Cree Huizhou Solid State Lighting Co Ltd
Current assignee: Cree Huizhou Solid State Lighting Co Ltd
Priority date: 2011-04-07
Filing date: 2011-05-27
Publication date: 2012-02-22
Anticipated expiration: 2021-05-27

Abstract

The utility model provides a display, which comprises a base plate, at least one light-emitting diode packaging piece, a light-emitting diode (LED) and a signal processing and LED driving circuit. The base plate is used for loading an array of the LED packaging pieces distributed in the mode of vertical rows and horizontal lines. The at least one LED packaging piece comprises a lead frame which is provided with a reflecting cup. The reflecting cup is provided with a bottom face and a wall face, the wall face is inclined relative to the bottom face, an opening is defined at the upper end of the wall face, and the reflecting cup is in an oval shape or a circular shape. The LED is installed on the bottom face, wherein the bottom face is provided with a first axis and a second axis perpendicular to the first axis, a first axial size of the first axis ranges from 0.91 mm to 1.1 mm, and a second axial size of the second axis ranges from 0.66 mm to 0.91 mm. The signal processing and LED driving circuit is electrically connected so as to enable the array of the LED packaging pieces to be connected with electricity optionally to produce visible images on the display. The display can save energy and reduce light pollution.

Description

Display

Technical field

The disclosure relates generally to light emitting diode (LED), and more specifically, relates to have the inclination peak emission LED device of (peak emission), and relates to the light-emitting diode display that comprises this type of device.

Background technology

In recent years, marked improvement has taken place in the LED technology, and the LED that therefore has enhanced brightness and color fidelity has obtained adopting.Because these improved LED and improved image processing techniques, large scale, all-colour LED video screen can obtain and obtain now widespread usage.The large scale light-emitting diode display typically comprises the combination of individual LED panel, provide by the distance between the neighbor perhaps " pel spacing (pixel pitch) " decision image resolution ratio.

Outdoor display, its purpose are to watch from farther distance, have big relatively pel spacing and generally comprise discrete led array.In discrete led array, the redness of one group of independent installation, green and blue led are actuated to form the full-color pixel that is shown to the observer.LED-based large-screen display (being commonly called huge screen) is at a lot of indoor and outdoor locations, and such as in competitive sports, horse-racing ground, concert and large-scale public area (such as the Times Square in city, New York), it is more common to become.A lot of these displays or screen can be greatly to 60 feet high and 60 feet wide.These screens can comprise thousands of " pixels " perhaps " picture element module ", and wherein each can comprise a plurality of LED.Picture element module adopt efficient and high brightness LED so that display can be watched from place far away relatively, even when receiving solar irradiation by day.Picture element module can have few to three or four LED (redness, a green and a blueness), and they allow the light of pixel through the multiple different colours of combined transmit of redness, green and/or blue light.In the huge screen of maximum, each picture element module can have many LED.Picture element module is disposed in the rectangular grid.For example, a grid can be that 640 modules are wide and 480 modules high, and the final size of screen depends on the physical size of picture element module.

Traditional LED-based display is by computer system control; Computer system receiving inputted signal (for example TV signal) and the particular color that is based on the picture element module place and needs form whole display image, and which LED in each picture element module of computer system decision is luminous and how brightly have.Also possibly comprise electric system, it can be conditioned so that it is luminous with required brightness to the electric power that each picture element module provides electric power and supplies with each LED.Provide conductor to apply each LED in suitable electric power signal to the picture element module.

The overwhelming majority in these huge screens typically is installed in observer's the above height place of eye-level display, on the top such as the side of buildings or the grandstand in the sports ground.Therefore, can the person of being observed do not see and be wasted by the major part of the light of display emission.In addition, the light of being wasted can cause light pollution owing to having produced unwanted light reflection and/or dazzle.A kind of mode that reduces the amount of the light that is wasted is through display being installed at an angle to mate observer's sight line better; But this needs complicated and expensive mounting hardware; It is difficult to use, especially for the very large display that is installed in high height place.

The utility model content

A purpose of the present disclosure provides a kind of improved LED device, and it has improved the efficient of the light of being launched by the large LED display.Disclosed LED device and light-emitting diode display can also be saved the energy and reduce light pollution.

An embodiment of light emission diode package member (package) comprises the reflector with bottom surface and wall (wall surface, wall surface), and wall tilts with respect to the bottom surface and locates to limit opening in the top.LED is installed on the bottom surface.The bottom surface of reflector have along first axial dimension of about 0.91mm to 1.1mm of first axle and along perpendicular to about 0.66mm of second axis of first axle to about second axial dimension of 0.91mm.

Another embodiment discloses a kind of display, and it includes lead frame (lead frame), and lead frame comprises the reflector with bottom surface and wall, and wall tilts with respect to the bottom surface and locates to limit opening in the top.The bottom surface have along about 0.91mm of first axle to about 1.1mm first axial dimension and along being about 72% to about 100% second axial dimension of first axial dimension perpendicular to second axis of first axle.

Another embodiment discloses a kind of display, and it comprises the substrate of carrying with the array of light emitting diode (LED) packaging part of vertical row and horizontal line layout.In the light emission diode package member at least one has lead frame, and this lead frame has reflector.Reflector has bottom surface and wall, and wall tilts with respect to the bottom surface and locates to limit opening in the top, and reflector is oval or circular.There is LED to be installed on the bottom surface.The bottom surface have along about 0.91mm of first axle to about 1.1mm first axial dimension and along perpendicular to about 0.66mm of second axis of first axle to about second axial dimension of 0.91mm.This display further comprises signal Processing and led drive circuit, and its array that is electrically connected optionally to make light emission diode package member is switched on so that on display, produce visual picture.

Further, the area of bottom surface is greater than the area of the bottom surface of LED and less than the area of opening.

Further, first axial dimension and the ratio of second axial dimension are in 1: 1 to 11: 7 scope.

Further, first axial dimension is than the long 0.2mm to 0.4mm of second axial dimension.

Further, LED is installed into the intersection point away from the first axle and second axis.

Further, the bottom surface is asymmetric about first axle.

Further, the bottom surface is about second axis symmetry.

Further, first axial dimension is 0.95mm to 1.05mm.

Further, second axial dimension is 0.75mm to 0.85mm.

Further embodiment discloses a kind of light emission diode package member, and it comprises the reflector with bottom surface and wall, and wall tilts with respect to the bottom surface and locates to limit opening in the top.LED is installed on the bottom surface.The bottom surface has along first axial dimension of first axle with along second axial dimension perpendicular to second axis of first axle.The bottom surface has crooked boundary member (curved border portion) and straight boundary member.Half of the length of sweep girth much larger than the bottom surface.

Another embodiment discloses a kind of light emission diode package member, and it comprises the reflector with bottom surface and wall, and wall tilts with respect to the bottom surface and locates to limit opening in the top.LED is installed on the bottom surface.The bottom surface of oval reflector have less than first axial dimension of about 0.89mm and along perpendicular to second axis of first axle less than about second axial dimension of 0.64mm.

The utility model LED device has improved the efficient of the light of being launched by the large LED display, and disclosed LED device and light-emitting diode display can also be saved the energy and reduce light pollution.

Description of drawings

Fig. 1 is the vertical view according to the LED device of an embodiment of the present disclosure;

Fig. 2 is the viewgraph of cross-section of the embodiment shown in Fig. 1, along profile line 2-2 intercepting;

Fig. 3 is the viewgraph of cross-section of the embodiment among Fig. 1, along observation line 3-3 intercepting;

Fig. 4 is the vertical view according to the LED device of another embodiment of the present disclosure;

Fig. 5 is the diagram of cut-open view that covers the local excision of lensed LED, along observation line 5-5 intercepting;

Fig. 6 is first side sectional view that covers the lens of LED device;

Fig. 7 is the cut-open view of the lens among Fig. 6;

Fig. 8 is second side view that covers the lens of LED device among Fig. 6;

Fig. 9 is the vertical view of the lens among Fig. 6;

Figure 10 is the planimetric map that comprises according to the part of the LED display of the LED device of embodiment of the present disclosure;

Figure 11 is the LED display diagram relevant with the observer of Figure 10;

Figure 12 (a) is the plot according to the horizontal far field pattern of the LED device of an embodiment of the present disclosure (far field pattern).

Figure 12 (b) is the plot according to the relative first negative visual angle of horizontal far field pattern of the LED device of an embodiment of the present disclosure;

Figure 12 (c) is the plot according to the relative second negative visual angle of horizontal far field pattern of the LED device of an embodiment of the present disclosure;

Figure 12 (d) is the plot according to the vertical far field pattern of the LED device of an embodiment of the present disclosure;

Figure 13 (a) is the plot according to the horizontal screen curve (screen curve) of the LED screen of an embodiment;

Figure 13 (b) is the plot according to the relative first negative visual angle of horizontal screen curve of the LED device of an embodiment of the present disclosure;

Figure 13 (c) is the plot according to the relative second negative visual angle of horizontal screen curve of the LED device of an embodiment of the present disclosure;

Figure 13 (d) is the plot according to the vertical screen curve of the LED device of an embodiment of the present disclosure.

Embodiment

Below description has presented preferred implementation of the present disclosure, shows imagination and is used to realize optimum way of the present disclosure.This description is not to be used to limit purpose, and only as the purpose of describing General Principle of the present disclosure, the scope of the present disclosure is defined by the following claims.

To more fully describe the embodiment of the utility model now hereinafter with reference to accompanying drawing, the embodiment of the utility model be shown in the accompanying drawing.Yet the embodiment that is defined in herein to be set forth implemented and can not be interpreted as to the utility model can with multiple different form.In fact, these embodiments are provided so that this openly will be detailed and complete, and the scope of the utility model is expressed to those skilled in the art fully.Same label is the element of TYP all the time.

Should be understood that, though term first, second or the like can be used to describe various elements at this, these elements should not limited by these terms.These terms only are used for an element and another are distinguished.For example, first element can be called as second element, and similarly, second element can be called as first element, and does not deviate from the scope of the utility model.As in that this adopted, term " and/or (and/or) " comprise one or more relevant Listed Items arbitrarily with all combinations.

Should be understood that; When an element (such as layer, district or substrate) was called as at another element " upward (on) " or extends " extremely ... go up (onto) " another element, it can be located immediately at or directly extend on another element or can also have intermediary element.On the contrary, when an element is called as " being located immediately at (directly on) " or extends " directly extremely ... go up (directly onto) " another element, there is not intermediary element here.It is to be further understood that when an element is called as " connection (connected) " or " engaging (coupled) " to another element it can directly be connected or be engaged to another element or has intermediary element.On the contrary, when being called as " directly connecting (directly connected) ", an element when perhaps " direct joint (directly coupled) " is to another element, do not have intermediary element here.

Relational language such as " following (below) " perhaps " above (above) " perhaps " go up (upper) " perhaps " (lower) down " perhaps " level (horizontal) " perhaps " vertically (vertical) " can be used to an element shown in the description figure, layer or district relation at this with respect to another element, layer or district.Should be understood that these term purposes are to comprise the different directions the direction of in figure, being described of this device.

Only as the purpose of describing specific implementations, and purpose does not lie in the utility model is limited at term that this adopted.As in that this adopted, singulative " (a) ", " one (an) " and " should (the) " same purpose are to comprise plural form, only if spell out in addition in the literary composition.Should further be understood that; Term " comprises (comprises) " when adopting at this, when " comprising (comprising) ", " comprising (includes) " and/or " comprising (including) "; Refer in particular to the existence of the characteristic stated, overall, step, operation, element and/or parts, but do not get rid of the existence of one or more characteristics, overall, step, operation, element, parts and/or its cohort or increase.

Only if definition in addition has the identical meaning of common sense of the those of ordinary skill in the affiliated field of utility model therewith at all terms (comprising technology and scientific terminology) that this adopted.Should further be understood that; Should be interpreted as the corresponding to meaning of the meaning in the content that has in the instructions and correlative technology field therewith at the term that this adopted; And can not be interpreted as idealized or too formal meaning, only if in this clear and definite so definition.

Fig. 1-Fig. 3 has described an embodiment of light emission diode package member 10 with different views.Fig. 1 is the vertical view of light emission diode package member 10, shows the reflector 20 with bottom surface 22 and wall 23, and wall tilts with respect to bottom surface 22, and limits an opening 24 at the upper end of reflector 20.LED30 is installed on the bottom surface 22.Bottom surface 22 has along first axial dimension 26 of first axle 40 with along second axial dimension 28 perpendicular to second axis 50 of first axle 40.In some embodiments, preferably, first axial dimension 26 is extremely approximately 1.1mm of about 0.91mm, and second axial dimension 28 is that about 0.66mm is to about 0.91mm.More preferably, first axial dimension 26 is extremely approximately 1.05mm of about 0.95mm, and second axial dimension 28 is that about 0.75mm is to about 0.85mm.

According to the disclosure, the size of imagination reflector 20 is manufactured with minimum dimensional tolerence.These closed tolerances only receive the manufacturing capacity of the Sheet Metal Forming Technology that is used to form reflector and the restriction of lead frame assembling process, and are defined to the Minimum Finite size of LED30.Correspondingly in other embodiments, first axial dimension 26 is less than about 0.89mm, and second axial dimension 28 is less than about 0.64mm.Further, first axial dimension 26 can be less than the approximately 0.85mm and second axial dimension 28 less than about 0.6mm.Further, the size of the length of first axial dimension 26 and second axial dimension 28 and LED30 approximately identical and have the size that increases slightly with the electric connection that allows LED30 and with the performance characteristic of device disclosed herein consistent light propagate.

In one embodiment, the area of bottom surface 22 is greater than the area of the bottom surface of LED30 and less than the area of opening 24.In other embodiments, the ratio of first axial dimension 26 and second axial dimension 28 can from about 1: 1 to about 11: 7 scope.For example, the ratio of first axial dimension 26 and second axial dimension 28 can be about 5: 4.Preferably, in some embodiments, second axial dimension 28 is about 72% to about 100% of first axial dimension 26.More preferably, second axial dimension 28 is about 75% to 90% of first axial dimension 26.Most preferably, second axial dimension 28 is about 78% to 85% of first axial dimension 26.

Opening 24 also have along first axial dimension 32 of first axle 40 and along second axial dimension, 34, the second axis normal of second axis 50 in first axle 40.Preferably, first axial dimension 32 is that about 1.3mm is to approximately the 1.5mm and second axial dimension 34 are the extremely about 1.14mm of about 0.94mm.More preferably, first axial dimension 32 is extremely approximately 1.45mm of about 1.35mm, and second axial dimension 34 is that about 0.99mm is to about 1.09mm.

Consistent with the imagination of the size characteristic that in manufacturing tolerance, limits with the finite size of LED30, the size of opening 24 is with keeping relevant with the size of bottom surface 22, so that the light propagation is consistent with the performance characteristic of device disclosed herein.Correspondingly, in other embodiments, first axial dimension 32 less than the approximately 1.25mm and second axial dimension 34 less than about 1.00mm.Further, first axial dimension 32 can be less than about 1.2mm, and second axial dimension 34 is less than about 0.95mm.

In the embodiment disclosed herein, first size will be longer than second size so that be wider than the visual angle along second axis 50 along the visual angle of first axle 40.For example, first axial dimension, 26 to the second axial dimensions 28 are grown up about 0.2mm to about 0.4mm.For example, LED30 can have along about-60 ° to+60 ° the horizontal view angle of first axle 40.As applied at this, term " visual angle (view angle) " is that the light intensity of in far field pattern (FFP), being launched by LED is about 50% o'clock angular range of peak strength.FFP is the optical signature of LED and represents the luminous intensity in the space.The most at large, FFP has shown the standardized luminous intensity ratio at different angle of radiation places.In this embodiment, light emission diode package member 10 is modified on second direction, produce uniform FFP producing asymmetric FFP on the first direction.The design of the supplementary features of asymmetric localization LED and reflector is disclosed in the common unsettled U.S. Patent Application Serial Number 12/498,277 of applicant and common unsettled U.S. Patent Application Serial Number 12/868,567, and its disclosure is incorporated into this through quoting as proof.

LED30 when being arranged in the geometric center of bottom surface, can have approximately-28 ° to+28 ° vertical visual angle of edge second axis 50.When LED30 is become the geometric center place away from bottom surface 22 by dislocation (displaced); Geometric center is the intersection point between the first axle 40 and second axis 50 in Fig. 1, and LED30 can have approximately-40 ° to+10 ° vertical visual angle and peak strength and be positioned at approximately-20 and ° to locate.In the case, the visual angle is with approximately-20 ° inclination.As in that this adopted, in other words the centre of form that " geometric center (the geometrical center) " on term surface is defined as plane pattern perhaps, is divided into plane pattern the point of crossing of the two-part straight line of identical square.In the environment of disclosed device, in some embodiments, plane pattern is the opening of reflector herein.

In some embodiments, the geometric center of bottom surface 22 can overlap with the intersection point of the first axle 40 and second axis 50 or be overlapping to produce relatively little inclination visual angle.Yet the geometric center of bottom surface 22 also can be become intersection point away from first axle 40 and second axis 50 with the big relatively inclination visual angle of acquisition by dislocation.Similarly, in some embodiments, the geometric center of opening 24 can overlap with the intersection point of the first axle 40 and second axis 50 or be overlapping, causes relatively little inclination visual angle.Further, in some embodiments, the geometric center of opening 24 can be become the intersection point away from the first axle 40 and second axis 50 by dislocation, causes big relatively inclination visual angle.

Fig. 2 is the viewgraph of cross-section of the embodiment among Fig. 1, along profile line 2-2 intercepting.LED30 is installed on the bottom surface 22 in the reflector 20.In shown embodiment, reflector 20 has the degree of depth of the extremely about 0.3mm of 0.2mm preferably approximately, so wall 23 has the height " h " of about 0.2mm to about 0.3mm.In some embodiments, highly " h " can be less than about 0.2mm.In other embodiments, highly " h " can be less than about 0.15mm.Further, height h can be in extremely about 0.24mm scope from about 0.16mm.Consistent with the imagination of the minimum size feature of reflector 20, highly " h " can be only greatly to the profile height that can hold LED30 (profile height, section height).In some embodiments, highly " h " can in addition less than the profile height of LED30.Vertical axis 60 extends through the center of reflector 20.

Light emission diode package member 10 comprises the lead frame with

bond pad

70 and 80, and they are connected with 86 conduction ground with lead-in wire 76 respectively.Further, reflector 20 has wall 44, is connected to the wall conduction led chip 30 and lead-in wire 86.The structured material that wall 44 can have uneven thickness and wall 44 and lead-in

wire

76 and 78 can be copper, iron or other conductive of material that can dispel the heat equally.Thermal diffusion is favourable, because light emission diode package member 10 can produce the peak value luminous intensity until about 3000mcd.Significantly, working current is less than about 20mA.Working current can be less than about 10mA.

Fig. 3 shows the viewgraph of cross-section of the light emission diode package member 10 of Fig. 1, along profile line 3-3 intercepting.As visible in Fig. 3, LED30 is from vertical axis 60 skews.With reference to Fig. 1-Fig. 3, light emission diode package member 10 has the reflector 20 that comprises bottom surface 22 and wall 23, and wall tilts with respect to bottom surface 22.Reflector 20 can have oval or general circular.The degree of tilt of wall 23 relative bottom surfaces 22 changes continuously, so that wall 23 has the part 48 of relatively steep (steep) and the part 46 of delaying (shallow) relatively.In Fig. 3, steep relatively part 48 can be near the bottom of reflector 20, and slow relatively part 46 can be near the top of reflector 20.For example, wall 23 limit steep part 48 with from first angle 54 between the 22 outward extending planes 52, bottom surface, and part of delaying 46 and second angle 56 between the plane 52.Preferably, angle 56 relative bottom surfaces 22 tilt with about 40 ° to about 50 ° and angle 54 relative bottom surfaces 22 with about 50 ° of extremely about 85 ° of inclinations.More preferably, first angle 54 can be about 75 ° to about 85 °, and second angle can be about 42 ° to about 48 °.Further, first angle 54 can be greater than second angle 56, so that for example, more rays reflects towards low visual angle from the top of reflector 22.

Fig. 4 is the vertical view according to the LED device of another embodiment of the present disclosure, and Fig. 5 shows the viewgraph of cross-section of the embodiment among Fig. 4, along profile line 5-5 intercepting.Similar with the front embodiment, relative vertical axis 60 skews of LED30.Like Fig. 4 and seen in fig. 5, bottom surface 22 its downside have straight boundary member and above that side have crooked boundary member.Crooked boundary member is longer than straight boundary member.The boundary member of the bending of bottom surface 22 has the half the length greater than the girth of bottom surface 22.Similarly, opening 24 has straight boundary member and has crooked boundary member at upside at downside.Preferably, the boundary member of the bending of opening 24 has the half the length greater than the girth of bottom surface 24.Correspondingly, compare with first embodiment among Fig. 1-Fig. 3 can be slightly small for the angle among Fig. 5 54.For example, preferably approximately 50 ° to about 75 ° of angles 54, more preferably, about 55 ° to about 65 °, and most preferably, about 57 ° to about 63 °.

Fig. 6 shows the different views that the reflector 20 that covered by lens 62 and Fig. 7-Fig. 9 show lens 62.Lens 62 preferably have the domed shape (dome-shape) with respect to the geometric center asymmetric localization of bottom surface 22.Lens 62 can have the profile height of the extremely about 7.3mm of 5.3mm preferably approximately, and more preferably, about 5.8mm is 6.8mm extremely approximately, and most preferably, the extremely about 6.6mm of about 6.0mm.In two vertical axis 64 shown in Fig. 6 and Fig. 7 and 65.Axis 64 aligns with the geometric center 66 of lens vertically, and axis 65 with in lens 62 bottoms the lens cross-section center 64 near the profile line 9-9 intercepting of Fig. 7 align vertically.Lens 62 have the rounded upper surface 68 of the vertical wall 69 of join dependency.Upper surface 68 has the geometric center 66 at the intersection point place that is positioned at axis 64 and upper surface 68.Distance 76 between axis 64 and the axis 65 is that about 0.2mm is to about 0.4mm.For example, geometric center 66 can be become away from lens along the about 0.2mm of geometric center in the bottom transverse cross section of profile line 9-9 to about 0.4mm by dislocation, shown in Fig. 7 and Fig. 9.Preferably, distance 76 is extremely approximately 0.35mm of about 0.25mm, and more preferably, about 0.27mm is 0.33mm extremely approximately.Correspondingly, the profile of lens 62 is crooked a little in one direction and as seen in fig. 9, lens 62 have circular (oblong) cross-sectional profiles of approximate square, and it has a smooth a little side and a relative round side.

Figure 10 is the planimetric map of the part of LED display 100, for example, comprises the outdoor display screen of the driver PCB102 that carries in a large number the substrate of arranging with row and column 104.Display screen 100 is divided into a plurality of pixels 110, and each pixel comprises the substrate 104 that has red at least, blue and green LED 106 on it.Each pixel of display can have about 10mm and multiply by about 10mm or bigger size.Further, each substrate 104 can be driven by the different voltages with different level.Substrate 104 comprises at least some LED106 with design feature described above.Substrate 104 is electrically connected to metallic circuit or the pad (not shown) on the PCB102, and metallic circuit or pad connect LED to suitable electric signal processing and driving circuit (not shown).Between pixel 110, can there be hole 108, be used for PCB102 is anchored into mounting platform.

Be energy savings and minimizing light pollution, display comprises at least one substrate with LED device 106 104, and this LED device has above disclosed reflector.Figure 11 shows light-emitting diode display 100, has observer 140 to be positioned at the viewing location of horizontal projection line below 120.120 representatives of horizontal projection line are substantially perpendicular to the line of watching face of display 100.Angle θ between sight line 130 and the horizontal projection line 120 is defined as the visual angle of relative display 100.Further, because observer 140 is positioned at horizontal line below 120, view angle theta is a negative value.

Figure 12 (a-c) shows respectively at about 0 °, approximately-18 ° and the about horizontal FFP of LED106 under-36 ° the visual angle.Figure 12 (d) shows the vertical FFP of LED106.In each figure of Figure 12 (a-d), two curves have been described the LED of emission different colours.For example, curve 152,156,160 and 172 has been described the LED of red-emitting, and curve 154,158,162 and 174 has been described the LED of transmitting green light.As visible among Figure 12 (a-d), curve 152,156,160 and 172 is match curve 154,158,162 and 174 respectively.Correspondingly, the LED that makes up according to the disclosure launches the light of different colours, and under different visual angles, has closely similar FFP.In some embodiments, disclosed light emission diode package member has the FFP peak value of about 3000mcd at place, visual angle approximately-18 °.Corresponding working current is less than about 20mA.In some embodiments, working current can be less than about 10mA.For example, luminous for the peak value of launching about 1253mcd, disclosed light emission diode package member has the working current of about 8.4mA.Therefore, through adopting disclosed light emission diode package member can practice thrift about 32% electric power.

Screen curve is an optical signature of display screen, and it has shown standardized luminous intensity ratio under different angle of radiation.Those skilled in the art recognizes, if for the different colours screen curve close match that light-emitting diode display produced, then have advantage.Figure 13 (a-c) shows light-emitting diode display 100 respectively at about 0 °, approximately-18 ° and the about horizontal screen curve under-36 ° the visual angle.Figure 13 (d) shows the vertical screen curve of light-emitting diode display 100.Figure 13 (a-d) each figure in, two curve descriptions the emission different colours LED.Screen curve when for example, curve 176,180,184 and 188 has been described all pixel red-emittings of light-emitting diode display 100.Screen curve when accordingly, curve 178,182,186 and 190 has been described all the pixel transmitting green lights when light-emitting diode display 100.Because curve 176,180,184 and 188 is match curve 178,182,186 and 190 respectively, light-emitting diode display 100 is expected to appear closely similar screen curve when the emission different colours.

Further, to have with about 0 ° be the wide relatively horizontal view angle at center to light-emitting diode display 100.Accordingly, light-emitting diode display 100 have with approximately-8 ° to approximately-28 ° be the narrow relatively vertical visual angle at center.More preferably, light-emitting diode display 100 have with approximately-13 ° to approximately-23 ° be the narrow relatively vertical visual angle at center, and most preferably, ° being the narrow relatively vertical visual angle at center approximately-18.

From aforementioned, can find out that these embodiments provide a kind of light emission diode package member, it comprises the reflector with bottom surface and wall, and the relative bottom surface of wall tilts and locates to limit opening in the top.LED is installed on the bottom surface and can be covered at least in part by asymmetric lens.Therefore the light of disclosed from here light emission diode package member emission tilt and be directed to observer's eyes, this observer be positioned at the light-emitting diode display that comprises the light emission diode package member of arranging according to the disclosure below.The amount of the light of in comprising the huge display screen of disclosed light emission diode package member, being wasted further, reduces.

Therefore, preceding detailed description is intended to be regarded as exemplary and non-limiting, and should be understood that, following claim (comprising all equivalents) is intended to limit spirit of the present disclosure and scope.

Claims

1. a display is characterized in that, comprising:

Substrate carries the array with the light emission diode package member of vertical row and horizontal line layout;

At least one comprises the said light emission diode package member of lead frame; Said lead frame has reflector; Said reflector has bottom surface and wall, and said wall tilts with respect to said bottom surface and locates to limit opening in the top, and said reflector is oval or circular;

LED is installed on the said bottom surface, and wherein, said bottom surface has along first axial dimension of the 0.91mm to 1.1mm of first axle with along second axial dimension perpendicular to the 0.66mm to 0.91mm of second axis of said first axle; And

Signal Processing and led drive circuit, the array that is electrically connected optionally to make light emission diode package member is switched on so that on said display, produce visual picture.

2. display according to claim 1 is characterized in that, the area of said bottom surface is greater than the area of the bottom surface of said LED and less than the area of said opening.

3. display according to claim 2 is characterized in that, the ratio of said first axial dimension and said second axial dimension is in 1: 1 to 11: 7 scope.

4. display according to claim 1 is characterized in that, said first axial dimension is than the long 0.2mm to 0.4mm of said second axial dimension.

5. display according to claim 1 is characterized in that, said LED is installed into the intersection point away from the said first axle and second axis.

6. display according to claim 5 is characterized in that said bottom surface is asymmetric about said first axle.

7. display according to claim 6 is characterized in that, said bottom surface is about said second axis symmetry.

8. display according to claim 1 is characterized in that, said first axial dimension is 0.95mm to 1.05mm.

9. display according to claim 1 is characterized in that, said second axial dimension is 0.75mm to 0.85mm.