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EP2260677A2 - Luminaires à réseau de del - Google Patents

Luminaires à réseau de del

Info

Publication number
EP2260677A2
EP2260677A2 EP09719537A EP09719537A EP2260677A2 EP 2260677 A2 EP2260677 A2 EP 2260677A2 EP 09719537 A EP09719537 A EP 09719537A EP 09719537 A EP09719537 A EP 09719537A EP 2260677 A2 EP2260677 A2 EP 2260677A2
Authority
EP
European Patent Office
Prior art keywords
led
array
leds
luminaire
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09719537A
Other languages
German (de)
English (en)
Inventor
Frantisek Kubis
Pavel Jurik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robe Lighting sro
Robe Lighting Inc
Original Assignee
Robe Lighting sro
Robe Lighting Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robe Lighting sro, Robe Lighting Inc filed Critical Robe Lighting sro
Publication of EP2260677A2 publication Critical patent/EP2260677A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/28—Controlling the colour of the light using temperature feedback
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/18—Controlling the light source by remote control via data-bus transmission

Definitions

  • the present invention generally relates to a system and method for driving LED arrays when used in a light beam producing luminaire. More particularly the invention relates to a system and method for driving an array of such Luminaires to generate images or light patterns. The invention also relates to preventing spill light and controlling the beam angle of an LED array. Additionally, the invention relates to a system and method for maximizing the light output from the LEDs while maintaining them at or below their optimum operating temperature and uniformity across the LED array or a plurality of LED arrays.
  • High power LEDs are commonly used in luminaires for example in the architectural lighting industry - in stores, in offices and businesses; as well as in the entertainment industry - in theatres, television studios, concerts, theme parks, night clubs and other venues.
  • LED arrays are frequently used to present images to an audience. It is common when projecting large images for the images to be divided into parts and then the parts transmitted to portions of the array. The transmission of these images can require significant bandwidth. In such applications the LED arrays are also frequently used to project a beam of light.
  • the differently colored LEDs may be arranged in an array in the luminaire where there is physical separation between each LED, and this separation, coupled with differences in die size and placement for each color, may affect the spread of the individual colors and results in objectionable spill light and color fringing of the combined mixed color output beam. It is common to use a lens or other optical device in front of each LED to control the beam shape and angle of the output beam; however these optical devices are commonly permanently attached to the luminaire requiring tools and skilled labor to change and may additionally need to be individually changed for each LED or pixel individually. It would be advantageous to be able to simply and rapidly change such optical devices for the entire array simultaneously without the use of tools.
  • FIGURE 1 illustrates an LED array multi-parameter automated luminaire
  • FIGURE 7 illustrates an of automated luminaries in a two-dimensional array configuration where each luminaire includes an LED array in order to display an image(s) or light pattern;
  • FIGURE 8 illustrates another embodiment of an array of automated LED array luminaires configured in a two-dimensional array;
  • FIGURE 9 illustrates an other embodiment of the luminaire array of Figure 7 wherein the spacing between the luminaries has been increased;
  • FIGURE 10 illustrates another embodiment of the luminaire array of Figure 7 wherein the spacing between the luminaries is not uniform or consistent;
  • FIGURE 11 illustrates an alternative embodiment of the invention with a beam control system mounted proximate to the LED array;
  • FIGURE 12 illustrates a view of the beam control system of Figure 11 with the beam control system detached from the LED array;
  • FIGURE 13 illustrates a problem with prior art LED array lighting fixtures
  • FIGURE 14 illustrates a single cell of an embodiment of the beam control array of Figure 11
  • FIGURE 15 illustrates an exploded diagram view of the beam control array embodiment of Figure 14
  • FIGURE 16 illustrates an exploded diagram view of the embodiment of the beam control array embodiment of Figure 14.
  • the yoke in turn is mounted to a top box 16 which may contain movement processing electronics 42, motor drivers 44 and driving electronics for the LEDs 48 as well as communication systems 40 to allow it to receive data such as from an industry standard DMX512 data stream or some other similar protocol.
  • the top box 16 may also contain a media server 46 capable of outputting pixel mapped images under command of a DMX512 signal.
  • the media server may be a module that can be easily removed or replaced.
  • the pixel mapped images may control individual LEDs or LED pixels comprising adjacent red, green and blue LEDs in the LED array 12 so that they behave as pixels in an image display. Use of the LEDs in an LED luminaire to display images in this manner is well known in the art.
  • a temperature probe 24 is also mounted on the substrate or circuit board 22. In alternative embodiments temperature probe 24 may also be mounted in other locations such as on a heat sink (not shown).
  • Figure 3 illustrates an exemplar curve 30 on a temperature versus time graph 32 for an LED, or LED array, run at a fixed power level. When the power is set to a normalized level the temperature will rise over time and tend towards an asymptotic limit 34.
  • FIG 4 illustrates an exemplar curve 40 on a temperature versus power graph 42 for an LED, or LED array.
  • the temperature rises increasingly with power.
  • the array may go into a thermal runaway situation where the temperature rises rapidly and the LEDs are permanently damaged. It is important to avoid such a result.
  • a single probe is used. This probe may consist of a single sensor or it may consist of a temperature sensor with thermal connection to receive temperature signals from one or more sections or locations on the circuit board 22 and or heat sink(s). In other embodiments, the temperature probe may have several sensors located in different sections of the circuit board 22 and/or heat sink(s) (not shown).
  • One of the routines performed by the LED driver hardware (48 from Figure 1 and software drivers 66 is as follows: a. Set the LED power to a known value; b. Measure the temperature of the substrate or circuit board using a temperature probe; c. Measure and establish the rate of rise curve for Temperature with Time as illustrated in Figure 3; d. Increase the Power a known amount and repeat (b) and (c) to establish the rate of rise curve for Temperature with Power as illustrated in Figure 4; e. Take as many measurements as necessary to complete this data throughout the nominal range of operations.
  • the curves established may be extrapolated back to allow both the prediction of final steady state die temperature from any desired input power and the time that will be taken to achieve that temperature.
  • a fan may be used to assist with cooling the LEDs. In some entertainment venues such as theatres or opera houses it is important to minimize the noise produced by luminaires and running any fans at as low a speed as possible can assist with this need.
  • the speed of the fan may be controlled to provide the right amount of cooling while keeping the fan speed as low as possible so as to minimize noise produced by the luminaire.
  • the luminaire may optimally control the fan speed to minimize noise using knowledge of (i) the temperature reported by temperature probe 24, (ii) the power and thus heat load required by the LEDs and, (iii) the current ambient temperature.
  • input cable 56 carries the DMX512 signal from a control desk to first luminaire 50 and thence in a daisy chain manner through cable 58 to luminaire 52 and cable 60 to luminaire 54.
  • Each automated LED luminaire 50, 52, and 54 may be addressed such that it responds to data on the DMX512 signal that is specific to said luminaire.
  • Each LED luminaire 50, 52, and 54 may contain a media server capable of outputting pixel mapped images under command of a DMX512 signal that control the LEDs in its associated LED array. Through the common DMX512 signal such a series of luminaires may behave in a coordinated manner.
  • the luminaires may share there temperature information with each other and the control desk so that if desired, the luminaries may coordinate so that the drivers drive the LEDs so that the correction to color and intensity as a result of the above described routine of the LED drivers is uniform across the array of LED luminairs rather than just for individual LEDs, or individual LED arrays or sub-arrays.
  • Such coordination may also be employed so that a single image may appear across all the LED arrays, portion 1 on luminaire 50, portion 2 on luminaire 52 and portion 3 on luminaire 54 as is described in greater detail below.
  • an array of LED luminairs is employed to project a single image, it might be desirable to have the light color and output adjustments be uniform from fixture to fixture. If the array of luminaries is being used to provide light rather than display an image it may be desirable that the total output from each array be consistent across the array of luminaries.
  • the image displayed may be a stationary image or a stream of images representing a moving video based image provided by the local store within each LED luminaire 10.
  • FIG 11 illustrates an embodiment of the invention: an automated luminaire 400 with an array of LEDs fitted with a beam control array 414 may be mounted to the front of the luminaire adjacent to the LEDs 404.
  • Beam control array 414 is retained on the luminaire 400 by retention clip 412.
  • Retention clip 412 may be recessed such that the unit is secure against accidental removal of the beam control array 414.
  • the beam control array 414 may be a fixed feature of the luminaire. However in the preferred embodiment it is removable so that it can be cleaned or replaced or substituted with a differently shaped array the benefits of which will be appreciated below.
  • FIG 12 illustrates an exploded view of the embodiment illustrated in Figure 11.
  • Luminaire 400 contains an array of LEDs 304.
  • a beam control array 414 may be mounted to the front of the luminaire adjacent to the LEDs 404. Beam control array 414 is retained on the luminaire 400 by retention clip 412. And may be easily installed and removed as a single item.
  • Figure 13 illustrates a problem posed by prior art LED array luminaries.
  • Figure 13 illustrates two LEDs as may be used in an LED array luminaire causing light spill and or color fringing.
  • LED 422 and LED 424 may be of differing colors and, due to the different optical properties and construction of the LED dies, produce light beams 432 and 434 respectively that differ in beam spread.
  • the differing beam spreads mean that the light beams from LEDs 422 and 424 will impinge on an illuminated object 440 in such a way that areas 444 and 446 of the object are illuminated by a single LED only rather than the desired mix of both. This results in areas 444 and 446 being colored differently from the central mixed area and appearing as colored fringes.
  • Two LEDs only are illustrated here for clarity and simplicity however the same problem exists with systems incorporating more than two colors of LED.
  • Figure 14 illustrates a single cell of the beam control array 414.
  • the light output from the same LEDs 442 and 424 with differing beam angles as used in the prior art system shown in Figure 13 are impinging on object 440.
  • the light from LEDs 442 and 424 is modified by optical element 450 and louver mask 416 such that the beam angles from each LED are constrained to be very similar and the areas of color fringing 444 and 446 are significantly reduced in size.
  • Optical element 450 is an optional component in the system and may be a lens, lens array, micro- lens array, holographic grating, diffractive grating, diffuser, or other optical device known in the art.
  • FIG 14 shows both LEDs 422 and 424 within the same louver mask 416 however other embodiments may utilize separate louver masks for each LED. In alternative embodiments rather than increasing the height 419 of the louvers 416 the width 418 of the louver(s) may be increased for a similar result.
  • Figure 15 illustrates an exploded diagram of an embodiment of the beam control array 414.
  • Beam control array 414 comprises a louver mask array 462 containing multiple cells 420. Mounted onto the louver mask array 462 are optical element carriers 452 which clip into the cells 420 of the louver array 462.
  • Each optical element carrier 452 may in turn contain an optical element 450.
  • Optical elements 450 are here illustrated as micro lens arrays; however, the invention is not so limited and optical elements 450 may be any optical beam control device as known in the art.
  • Each optical element 450 is clipped into an associated optical element carrier 452.
  • every optical element 450 is identical but in further embodiments the optical elements 450 may differ across the beam control array 414.
  • alternating optical elements 450 may be of two different beam angles.
  • the optical elements 450 around the periphery of the beam control array 414 may be of one beam angle that differs from the beam angle of the optical elements 450 in the center of the beam control array 414.
  • the height of louver mask array 462 may be varied to effect different controlled beam angles for the emitted light. Such combinations of differing optical elements and louver array height may be advantageously chosen so as to allow fine control of the beam shape and quality.
  • the entire beam control array 414 may be installed or removed from the luminaire as a single easily replaced item.
  • the beam control array When installed on the luminaire the beam control array is adjacent to the LEDs 482 mounted on the LED Circuit board 478, reduces color fringing or halation and controls the beam angle to provide the lighting designer with a well controlled and defined beam of a single homogeneous color.
  • optical elements and louver arrays are provides such that symmetrical beams with angles of 12°, 25°, and 45° are available.
  • an asymmetrical optical element may be used that provides an elliptical beam such as one that is 15° in one direction and 45° in an orthogonal direction.
  • the beam angles given here are examples only and the invention is not so limited. Any beam angle or combination of beam angles is possible within a beam control array without departing from the spirit of the invention.
  • Beam control array 414 may further provide mechanical protection and dust exclusion for the LEDs 404.
  • an optical element comprising a clear, flat window may be used. Such a window has no effect on the beam while still providing protection and dust exclusion.
  • the control array 414 may also be of different shaped cells than those shown.
  • the cells be me round or hexagonal or other regular or non-regular shapes.
  • the user or rental company may stock a range of different beam control arrays with differing optical elements and louver array heights to facilitate quick and easy customization of a luminaire to provide the beam angle required for the current event or show.
  • Figure 16 illustrates an assembled array of an embodiment of a beam control array 414.
  • Figure 16 is viewed from the reverse direction of Figure 15 and shows an assembled beam control array 414.
  • Louver mask array 462 cells 420 may contain multiple sub-compartments 480 each of which may control the light output for a single LED die.
  • Optical element carrier 452 clips into the louver mask array 462 and, in turn, contains optical element 450.
  • Optical element 450 is adjacent to the LED dies 482 mounted on LED support 478.
  • Each LED 482 may comprise a single LED die of a single color or a group of LED dies of the same or differing colors. For example in one embodiment LED 482 comprises one each of a Red, Green, Blue and Amber die.
  • each LED die may be independently aligned with a sub-compartment 480 of the louver mask cell 420.

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Control Of El Displays (AREA)

Abstract

La présente invention concerne des systèmes à réseau de DEL avec des procédés améliorés d’alimentation de DEL dans le réseau, en surveillant la relation entre la température et la puissance d’entraînement pour prévoir quelle quantité d’électricité peut sans danger être appliquée aux DEL. La présente invention fournit également un système de commande pour les réseaux de DEL qui permet d’afficher des images ou des motifs de lumière à travers un réseau de luminaires, selon un protocole de commande à bande passante faible. La présente invention fournit également un luminaire à réseau de DEL présentant une frange de couleur réduite, une réduction de fuite de lumière et une commande d’angle de faisceau.
EP09719537A 2008-03-11 2009-03-11 Luminaires à réseau de del Withdrawn EP2260677A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US6892408P 2008-03-11 2008-03-11
US10696708P 2008-10-20 2008-10-20
US40241209A 2009-03-11 2009-03-11
PCT/US2009/036862 WO2009114646A2 (fr) 2008-03-11 2009-03-11 Luminaires à réseau de del

Publications (1)

Publication Number Publication Date
EP2260677A2 true EP2260677A2 (fr) 2010-12-15

Family

ID=40984720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09719537A Withdrawn EP2260677A2 (fr) 2008-03-11 2009-03-11 Luminaires à réseau de del

Country Status (2)

Country Link
EP (1) EP2260677A2 (fr)
WO (1) WO2009114646A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SA07280459B1 (ar) 2006-08-25 2011-07-20 بيورديو فارما إل. بي. أشكال جرعة صيدلانية للتناول عن طريق الفم مقاومة للعبث تشتمل على مسكن شبه أفيوني
RU2537700C2 (ru) * 2010-04-23 2015-01-10 Мартин Профешнл А/С Светильник с фоновым отображением, использующим рассеивающие пикселы между нерассеивающих источников света
CN105423227B (zh) * 2010-04-23 2019-03-12 哈曼专业丹麦公司 具有突出的漫射盖罩和多个光源的摇头灯具
DK177579B1 (en) * 2010-04-23 2013-10-28 Martin Professional As Led light fixture with background lighting

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6473002B1 (en) * 2000-10-05 2002-10-29 Power Signal Technologies, Inc. Split-phase PED head signal

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6388388B1 (en) * 2000-12-27 2002-05-14 Visteon Global Technologies, Inc. Brightness control system and method for a backlight display device using backlight efficiency
US6841947B2 (en) * 2002-05-14 2005-01-11 Garmin At, Inc. Systems and methods for controlling brightness of an avionics display
US7183727B2 (en) * 2003-09-23 2007-02-27 Microsemi Corporation Optical and temperature feedbacks to control display brightness

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6473002B1 (en) * 2000-10-05 2002-10-29 Power Signal Technologies, Inc. Split-phase PED head signal

Also Published As

Publication number Publication date
WO2009114646A2 (fr) 2009-09-17
WO2009114646A3 (fr) 2009-11-05

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