WO2010072731A1 - Led-anordnung mit lichtsensor - Google Patents
Led-anordnung mit lichtsensor Download PDFInfo
- Publication number
- WO2010072731A1 WO2010072731A1 PCT/EP2009/067676 EP2009067676W WO2010072731A1 WO 2010072731 A1 WO2010072731 A1 WO 2010072731A1 EP 2009067676 W EP2009067676 W EP 2009067676W WO 2010072731 A1 WO2010072731 A1 WO 2010072731A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- led
- light
- light sensor
- exit surface
- arrangement according
- Prior art date
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]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
-
- 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]
- H05B45/40—Details of LED load circuits
-
- 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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
Definitions
- the present invention generally relates to the operation of organic or inorganic LEDs or OLEDs. More specifically, the invention relates to a ⁇ nêtung such LEDs or OLEDs with the aid of a light sensor.
- a light sensor 1 inside or outside the LED light detects the light of the at least one LED 2 before or after the light mixture.
- a feedback signal 22 from the light sensor 1 is fed back to a control unit 23 as an actual value signal of the light generation. This signal is at least the amplitude again and may possibly also Freguenz or spectrum-specific statements.
- the control unit for example internally or externally a dimming value signal 24 may be specified.
- the control unit 23 controls the operation of the at least one LED 2 starting from a voltage supply shown as a converter in FIG. 7, which is supplied with a DC or AC input voltage Ui.
- the control unit 23 can, for example, control the power of one or more individual LEDs by PWM modulation.
- This described principle can be adopted in the present invention.
- Em such a structure is already known in principle from EP 1 399 694 (WO 2202/099333), which relates to a lighting device with light-emitting diodes and light sensor arrangements for optical feedback.
- FIG. 1 shows an LED lamp 12 which has one or more LEDs 2.
- the lamp 12 has a housing
- Light exit surface is provided, to which the light cone 7 of the LED 2 strikes.
- the light cone 7 can be limited by a reflector wall.
- the light exit surface has transparent regions 4 for the exit of the light from the LED 2 and at least one darkened region 5.
- the reference numeral 6 for example by reflection on the reflector wall 7
- light from the LED 2 can be reflected in such a way so as to strike the side of the darkened area 5 facing the LEDs.
- the rear side of the darkened region 5 is designed such that the reflected light (reference numeral 6 in FIG. 1) is guided into a reflector 25 associated with a light sensor 1.
- part of the light emitted thereby by the LED namely the part 6 in FIG. 1, is desired fed to the light sensor 1.
- FIG. 2 illustrates a further problem of this arrangement of the light sensor 1.
- Ambient light which is designated by the reference numeral 9 in FIG. 2, can pass from the outside of the LED light 12 through the transparent areas 4 to the rear side 26 of the darkened area, thus entering the area of the light sensor reflector 25 and is referred to as Fault on the sensor 1 perceived.
- the first aspect of the invention relates to an LED arrangement, comprising: at least one LED arranged on a carrier, preferably several LEDs of at least two different colors,
- a housing accommodating the at least one LED with a light exit surface
- the light sensor is arranged outside the space defined by the light exit surface and the carrier.
- a further aspect of the invention relates to an LED arrangement, comprising: at least one LED arranged on a carrier, preferably several LEDs of at least two different colors,
- a housing accommodating the at least one LED with a light exit surface
- At least one light sensor and a control unit functionally connected to the at least one LED and the light sensor, shading means being provided which prevent ambient light incident on the light sensor from outside the housing from passing through the light exit surface.
- the at least one LED can be placed on a support and the light sensor behind the formed by en Trager
- Another aspect of the invention relates to a
- LED arrangement comprising: at least one LED arranged on a carrier, preferably a plurality of LEDs of at least two different colors,
- a housing accommodating the at least one LED with a light exit surface through which a main light cone of the at least one LED passes,
- the control unit operatively connected to the at least one LED and the light sensor, wherein the light sensor is hit by secondary light which is not generated directly or indirectly from the main light cone.
- the secondary light can strike the light sensor from a further light exit surface of the at least one LED.
- the further light exit surface is spatially separated from a light exit surface of the at least one LED, at which the main light cone exits.
- the further light exit surface can be arranged on the rear side facing away from the main light cone of the LED chip.
- the secondary light can pass through at least one recess in a carrier on which the LED is mounted to the back of the carrier.
- the light sensor is preferably arranged in a region on the rear side of the carrier.
- Light from an LED in particular an OLED (organic LED), can reach the back of the carrier through several recesses.
- OLED organic LED
- the secondary light may emanate from another LED which is aligned with that at least one LED from which the main light cone exits.
- the further LED can be arranged on the same side or on the backside of a carrier on which at least one main light cone LED is arranged.
- the LED array may include a plurality of LEDs of different colors, preferably at least one in the green, red, and blue spectrum, respectively.
- the LED assembly may include a lens.
- the LED array may comprise at least one color conversion material converted white LED.
- the light sensor may have one or more photodiodes, which are preferably color-specific.
- a lighting system may have an LED arrangement according to the invention.
- Fig. 2 illustrates the negative influence of
- 3 shows a first embodiment of the present invention with matched LEDs
- 4 shows a further embodiment of the invention with matched LEDs arranged spatially separated from the main illumination LEDs
- FIG. 5 shows a further embodiment of the invention, in which the light sensor is set back compared to a carrier plane of at least one LED
- FIG. 6 shows a modification of the embodiment of FIG. 5 in that a single LED or OLED supplies a plurality of recesses in a set-back space with the light sensor 1, and FIG. 6
- Fig. 7 shows schematically the basic operation of a fed back
- Light sensor in the LED drive as can also be used in the present invention.
- an LED lamp 12 is provided with a housing 3 and an LED 2 or an LED arrangement. It can be provided a reflector 7 to direct the beam of light from the LED 2 to a light exit surface 10 of the LED light.
- the light exit surface 10 is preferably transparent throughout. Thus, it has no darkened areas compared to the prior art, ie at least no darkened areas which are surrounded by transparent areas and thus represent "dark islands" of the light exit area.
- This light exit surface 10 may be formed, for example, as a diffuser, which is only one example of a light mixing element. This will preferably be the case if several differently colored LEDs 2 are provided for example in the spectra red, green, blue. Alternatively or additionally, the LED arrangement 2 can also have one or more dye-converted white LEDs.
- the LED or LED arrangement 2 is arranged on a support 8, which can also achieve, for example, several functions such as the electrical supply (board) or a cooling effect or heat dissipation.
- This exemplary embodiment of FIG. 3 is provided for the light-pressure coupling to the control unit (see FIG. 7) and the secondary LEDs 11. These secondary LEDs 11 are matched to the main illumination LEDs 2 in such a way that they have the same spectrum and preferably also the same temperature characteristics.
- the secondary elements 11 are preferably located in the immediate vicinity of the LEDs 2 and therefore within the housing 3 of the LED lamp 12. Particularly preferred is the arrangement of the elements 11 on the same carrier 8 and preferably there on the back of the carrier. 8 Thus, the secondary LEDs 11 radiate into a region provided on the rear side 27 of the carrier 8. In this area, as shown, the light sensor 1 is arranged.
- the light sensor 1 is therefore sealed off by the non-transparent carrier 8 from the space defined between the carrier 8 or the LED 2 and the light exit surface 10.
- ambient light which as schematically shown, and provided with a reference numeral 6 can fall from the outside through the light exit surface 10 in the space between the carrier 8 and the light exit surface 10, do not fall on the light sensor 1 and thus can not represent a Storsignal.
- the secondary LEDs 11 are preferably driven by the control unit (23 in FIG. 7) in the same way as the main light LEDs 2. Thus, a secondary light is generated purely for measurement purposes, which is not affected by the ambient light.
- secondary LEDs 16 are provided, which are now, however, provided spatially separated from the LED lamp 12.
- these secondary light LEDs 16 and also the light sensor 1 are assigned to the control / converter unit 14, 15.
- This unit is connected to the LED lamp 12, for example via a supply cable 13 for driving the LEDs 12.
- the measurement of Light characteristics on the one hand indirectly via the secondary light LEDs 16 and on the other hand in a spatially separated location with respect to the LED lamp 12 and the main light LEDs provided there 2.
- an LED lamp 12 is preferably a Temperature sensor 28 is provided, the output of the control / drive unit 14, 15 is supplied, since yes, the temperature of the secondary LED 16 may differ significantly due to the spatial separation of the main light LEDs 2.
- FIG. 5 now shows an exemplary embodiment in which the light incident on the light sensor 1 is not generated by secondary-light LEDs 11, 16 but by the main-light LEDs 2.
- the one or more LEDs 2 have, in addition to the LED outlet surface 29 facing the light exit surface 10, a further outlet surface 30.
- the exit surface 30 of the at least one LED 2 is arranged on the back side.
- the support which may be formed as auxiliary support 17, one or more recesses 19 (for example bores) are provided, through which the light passes from the further exit surfaces 30 of the LED 2 into the region behind the auxiliary support 17.
- the rear side of the LED 2 overlaps one or more recesses 19.
- FIG. 6 shows a modification of the exemplary embodiment of FIG. 5 in that a flat-shaped LED 21, preferably an OLED, covers a plurality of recesses 19.
- a flat-shaped LED 21 preferably an OLED
- the light sensor can be provided to detect characteristics of the LED 2, since these can depend on the temperature, the aging, etc. of the LED.
- the light sensor can in particular be color or spectrum-selective, so that a return signal for color value stabilization (color coordinate in the CIE system) can be used by selective activation of LEDs of different colors.
- the invention proposes a sensor arrangement which ensures that the light sensor is not actually detected by the LED and not a combination of, for example, the light from the LED with ambient light.
- the exemplary embodiment of Figure 5 and 6 are also modified so that the light sensor 1 is not located in a room behind the carrier 17, but rather in the carrier 17 is provided a recess that he thus also detect light from the LED 2 can, without the recesses 30 are necessary.
Landscapes
- Electroluminescent Light Sources (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112009003762T DE112009003762A5 (de) | 2008-12-22 | 2009-12-21 | Led-anordnung mit lichtsensor |
EP09799100.4A EP2361489B1 (de) | 2008-12-22 | 2009-12-21 | Led-anordnung mit lichtsensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008064397.1 | 2008-12-22 | ||
DE102008064397A DE102008064397A1 (de) | 2008-12-22 | 2008-12-22 | LED-Anordnung mit Lichtsensor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010072731A1 true WO2010072731A1 (de) | 2010-07-01 |
Family
ID=41800593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/067676 WO2010072731A1 (de) | 2008-12-22 | 2009-12-21 | Led-anordnung mit lichtsensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2361489B1 (de) |
DE (2) | DE102008064397A1 (de) |
WO (1) | WO2010072731A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2579682B1 (de) | 2011-10-07 | 2015-09-09 | Goodrich Lighting Systems GmbH | Verfahren zur Steuerung eines Flugzeuglichts |
US9360174B2 (en) | 2013-12-05 | 2016-06-07 | Ketra, Inc. | Linear LED illumination device with improved color mixing |
EP3875851A1 (de) * | 2013-12-05 | 2021-09-08 | Lutron Ketra, LLC | Lineare led-beleuchtungsvorrichtung mit verbesserter farbmischung |
DE102020104776A1 (de) * | 2020-02-24 | 2021-08-26 | Tridonic Gmbh & Co Kg | Umgebungslichterfassung mittels eines innerhalb einer Leuchte angeordneten Polarisationsfilters |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5471052A (en) * | 1993-10-25 | 1995-11-28 | Eaton Corporation | Color sensor system using a secondary light receiver |
US5783909A (en) * | 1997-01-10 | 1998-07-21 | Relume Corporation | Maintaining LED luminous intensity |
WO2002099333A1 (en) | 2001-06-07 | 2002-12-12 | Koninklijke Philips Electronics N.V. | Led luminaire with light sensor configurations for optical feedback |
US20050133686A1 (en) * | 2003-12-19 | 2005-06-23 | Ng Fook C. | LED illumination system having an intensity monitoring system |
WO2008023306A1 (en) * | 2006-08-25 | 2008-02-28 | Philips Intellectual Property & Standards Gmbh | Optical lighting device |
WO2008022438A1 (en) * | 2006-08-22 | 2008-02-28 | Tir Technology Lp | Light source with photosensor light guide |
EP1924127A1 (de) * | 2005-08-12 | 2008-05-21 | Sharp Kabushiki Kaisha | Lichtquellen-steuereinrichtung, beleuchtungseinrichtung und flüssigkristall-anzeigeeinrichtung |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6611000B2 (en) * | 2001-03-14 | 2003-08-26 | Matsushita Electric Industrial Co., Ltd. | Lighting device |
US7950832B2 (en) * | 2006-02-23 | 2011-05-31 | Panasonic Electric Works Co., Ltd. | LED luminaire |
-
2008
- 2008-12-22 DE DE102008064397A patent/DE102008064397A1/de not_active Withdrawn
-
2009
- 2009-12-21 EP EP09799100.4A patent/EP2361489B1/de not_active Not-in-force
- 2009-12-21 WO PCT/EP2009/067676 patent/WO2010072731A1/de active Application Filing
- 2009-12-21 DE DE112009003762T patent/DE112009003762A5/de not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5471052A (en) * | 1993-10-25 | 1995-11-28 | Eaton Corporation | Color sensor system using a secondary light receiver |
US5783909A (en) * | 1997-01-10 | 1998-07-21 | Relume Corporation | Maintaining LED luminous intensity |
WO2002099333A1 (en) | 2001-06-07 | 2002-12-12 | Koninklijke Philips Electronics N.V. | Led luminaire with light sensor configurations for optical feedback |
EP1399694A1 (de) | 2001-06-07 | 2004-03-24 | Koninklijke Philips Electronics N.V. | Beleuchtungsvorrichtung mit leuchtdioden und lichtsensoranordnungen für optische rückkopplung |
US20050133686A1 (en) * | 2003-12-19 | 2005-06-23 | Ng Fook C. | LED illumination system having an intensity monitoring system |
EP1924127A1 (de) * | 2005-08-12 | 2008-05-21 | Sharp Kabushiki Kaisha | Lichtquellen-steuereinrichtung, beleuchtungseinrichtung und flüssigkristall-anzeigeeinrichtung |
WO2008022438A1 (en) * | 2006-08-22 | 2008-02-28 | Tir Technology Lp | Light source with photosensor light guide |
WO2008023306A1 (en) * | 2006-08-25 | 2008-02-28 | Philips Intellectual Property & Standards Gmbh | Optical lighting device |
Also Published As
Publication number | Publication date |
---|---|
DE112009003762A5 (de) | 2012-10-11 |
DE102008064397A1 (de) | 2010-06-24 |
EP2361489A1 (de) | 2011-08-31 |
EP2361489B1 (de) | 2018-08-29 |
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