DE102008027148A1 - Method for operating light source of motor vehicle, particularly tail-lamp of motor vehicle, involves applying light emitting diodes as illuminant, and controlling multiple light emitting diodes separately - Google Patents
Method for operating light source of motor vehicle, particularly tail-lamp of motor vehicle, involves applying light emitting diodes as illuminant, and controlling multiple light emitting diodes separately Download PDFInfo
- Publication number
- DE102008027148A1 DE102008027148A1 DE102008027148A DE102008027148A DE102008027148A1 DE 102008027148 A1 DE102008027148 A1 DE 102008027148A1 DE 102008027148 A DE102008027148 A DE 102008027148A DE 102008027148 A DE102008027148 A DE 102008027148A DE 102008027148 A1 DE102008027148 A1 DE 102008027148A1
- Authority
- DE
- Germany
- Prior art keywords
- emitting diodes
- light emitting
- light source
- motor vehicle
- leds
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/2696—Mounting of devices using LEDs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/30—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating rear of vehicle, e.g. by means of reflecting surfaces
-
- 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]
- H05B45/10—Controlling the intensity of the light
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Betrieb einer Lichtquelle eines Kraftfahrzeugs, insbesondere einer Rückleuchte eines Kraftfahrzeugs.The The invention relates to a method for operating a light source of a Motor vehicle, in particular a tail lamp of a motor vehicle.
Es
ist beispielsweise aus der Druckschrift
In
Bezug auf die Auswirkungen eines durch eine solche pulsförmig
betriebene LED-Lichtquelle erzeugten Lichtes auf die menschliche
Wahrnehmung offenbart
Bezüglich
des Betriebs einer Blinkleuchte eines Kraftfahrzeugs schlägt
Außerdem
offenbart
Schließlich
beschreibt
In der Praxis hat sich jedoch gezeigt, dass die Verwendung eines PWM-Signals zum Betrieb von LEDs einer Lichtquelle unerwünschte Nebeneffekte auf die menschliche Wahrnehmung besitzt, wenn sich die Lichtquelle stark bewegt oder wenn der Betrachter seinen Blick schnell über die Lichtquelle, insbesondere über eine weit entfernte Lichtquelle, bewegt. Dabei entsteht unabhängig von der Sehfrequenz des menschlichen Auges der Effekt, dass auf der Netzhaut einzelne Lichtinseln statt einer durchgehenden Bewegung bzw. eines durchgehenden Lichtbandes wahrgenommen werden. Die Rückleuchte eines Fahrzeugs kann beispielsweise bei schneller Kopfdrehung des Betrachters durch das Nachleuchten der Rezeptoren des Auges des Betrachters zu einer gleichzeitigen Vielfachwahrnehmung derselben Rückleuchte führen. Dementsprechend kann dieser Effekt im Straßenverkehr zu Irritationen führen und birgt somit ein Gefährdungspotential.In However, practice has shown that the use of a PWM signal to operate LEDs of a light source unwanted side effects possesses human perception when the light source strongly moved or when the viewer quickly turns his gaze over the light source, especially over a far distance Light source, moving. It arises independently of the Visual frequency of the human eye the effect that on the retina individual islands of light instead of a continuous movement or a continuous light band can be perceived. The tail light a vehicle can, for example, with rapid head rotation of the Observer by the afterglow of the receptors of the eye of the Observers to a simultaneous multiple perception of the same tail light to lead. Accordingly, this effect can be in traffic cause irritation and thus holds a potential hazard.
Die Aufgabe der vorliegenden Erfindung besteht folglich darin, diesem Effekt entgegenzuwirken und gleichzeitig die Vorteile der eingangs erwähnten pulsmodulierten Ansteuerung des LEDs zu nutzen.The It is therefore an object of the present invention to provide this Counteract effect while maintaining the benefits of the beginning to use mentioned pulse-modulated control of the LEDs.
Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des unabhängigen Anspruchs 1 gelöst.These Task is performed by a procedure with the characteristics of the independent Claim 1 solved.
Das Wesen der Erfindung besteht darin, mehrere verschiedene LEDs oder mehrere verschiedene Gruppen von LEDs dieser Lichtquelle zeitversetzt über unterschiedliche PWM-Signale, welche sich bevorzugt durch ihre Phasenlage unterscheiden, anzusteuern.The Essence of the invention is several different LEDs or several different groups of LEDs of this light source over time different PWM signals, which preferably by their phase position distinguish, to steer.
Bevorzugt kann auf diese Weise eine zeitlich konstante Helligkeit erreicht werden, indem ein Puls eines PWM-Signals genau zu dem Zeitpunkt einsetzt, an dem ein Puls eines anderen PWM-Signals endetPrefers can achieve a constant brightness in this way be by a pulse of a PWM signal at the exact time at which a pulse of another PWM signal ends
Die Erfindung besitzt gegenüber dem Stand der Technik Vorteile, die im folgenden erläutert werden.The Invention has advantages over the prior art, which will be explained below.
Das Verhältnis von der Dauer der tatsächlichen Lichtabstrahlung der gesamten Lichtquelle zu der Zeitdauer, in der sie gar kein Licht abstrahlt, verbessert sich zugunsten der Dauer der tatsächlichen Lichtabstrahlung.The Ratio of the duration of the actual light emission the entire light source at the time when it has no light at all radiates, improves in favor of the duration of the actual light emission.
Der oben beschriebene Effekt, dass auf der Netzhaut einzelne Lichtinseln statt einer durchgehenden Bewegung bzw. statt eines ein durchgehenden Lichtbandes wahrgenommen werden, verringert sich oder ist gar nicht mehr wahrzunehmen.Of the above-described effect that on the retina individual islands of light instead of a continuous movement or instead of a continuous light band be perceived, diminishes or is no longer noticeable.
Insbesondere werden durch Nachleuchteffekte der Netzhaut verursachte stroboskopähnliche optische Effekte vermieden.Especially become strobing-like visual effects caused by after-effects of the retina Effects avoided.
Die Stromversorgung der Lichtquelle wird über die Zeit gleichmäßiger belastet.The Powering the light source becomes more uniform over time loaded.
In einer vorteilhaften Ausführung der Erfindung können die verschiedenen LEDs oder Gruppen von LEDs zufällig über mehrere unterschiedliche PWM-Signale, welche keine definierte Phasen- und keine definierte Frequenzbeziehung zueinander besitzen, deren durchschnittliche Pulsweite und/oder Pulsfrequenz aber im zeitlichen Mittel ein Maß für die von der Lichtquelle abzugebende Lichtleistung darstellt, angesteuert werden.In an advantageous embodiment of the invention can the different LEDs or groups of LEDs randomly over several different PWM signals, which have no defined phase and have no defined frequency relationship to each other, whose average pulse width and / or pulse rate but in temporal Means a measure of the output from the light source Represents light output to be controlled.
Weitere vorteilhafte Ausführungen sind in den Unteransprüchen gekennzeichnet.Further advantageous embodiments are in the dependent claims characterized.
Im folgenden soll ein bevorzugtes Ausführungsbeispiel die Erfindung anhand mehrerer Zeichnung erläutern.in the The following is a preferred embodiment of the Explain invention with reference to several drawings.
Dabei bedeuten:
- U
- – Spannung
- V
- – Volt
- Uopt
- – Spannung des optimalen Arbeitspunktes der LEDs
- f
- – Frequenz
- ms
- – Millisekunden
- m
- – Meter
- s
- – Sekunde
- m/s
- – Meter pro Sekunde
- v
- – Geschwindigkeit der Lichtquelle
- U
- - Tension
- V
- - Volt
- Uopt
- - Voltage of the optimum operating point of the LEDs
- f
- - Frequency
- ms
- - milliseconds
- m
- - Meter
- s
- - second
- m / s
- - meters per second
- v
- - Speed of the light source
Ein Betrachter befindet sich beispielsweise im Abstand von 2,5 m zu der Strecke, auf der sich eine Lichtquelle quer zur Blickrichtung des Betrachters bewegt. Bei einer Geschwindigkeit von 10 m/s legt die Lichtquelle somit eine Entfernung von 5 Meter in 0,5 Sekunden zurück. Bei einer Frequenz des PWM-Signals von 20 Hz erfährt der Betrachter auf der Netzhaut im Stand der Technik 10 getrennte Lichtinseln über einen Öffnungswinkel von 90°.One Observer is for example at a distance of 2.5 m to the route, on which a light source transversely to the viewing direction the viewer moves. At a speed of 10 m / s lays the light source thus a distance of 5 meters in 0.5 seconds back. At a frequency of the PWM signal of 20 Hz experiences the viewer on the retina in the prior art over 10 separate islands of light over an opening angle of 90 °.
Zwar nimmt der Betrachter gemäß dem Stand der Technik bei einer erhöhten Frequenz von 40 Hz unter sonst gleichen Bedingungen 20 getrennte Lichtinseln über denselben Öffnungswinkel von 90° war, jedoch werden diese Lichtinseln im gleichen Verhältnis schmaler, sind also in diesem Fall etwa nur noch halb so breit. Das Verhältnis aus beleuchteten Bereichen der Netzhaut zu unbeleuchteten Bereichen der Netzhaut bleibt somit gleichermaßen unbefriedigend.Though takes the viewer according to the prior art at an increased frequency of 40 Hz, otherwise the same Conditions 20 separate islands of light over the same opening angle of 90 °, however, these islands of light are in the same proportion narrower, so in this case are only about half as wide. The ratio of illuminated areas of the retina to unlighted areas of the retina thus remains alike unsatisfactory.
Ein ähnlicher Effekt ist zu verzeichnen, wenn der Betrachter seinen Blick über die Lichtquelle während einer halben Sekunde um 90° bewegt. Dabei ist der Effekt jedoch unabhängig von der Entfernung des Betrachters zur Lichtquelle, findet also auch bei größeren Entfernungen statt.A similar one Effect is noticeable when the viewer looks over the light source is moved 90 ° for half a second. However, the effect is independent of the distance the observer to the light source, so also for larger Distances instead.
Bei größeren Entfernungen ist allerdings die Wahrnehmung der räumlichen Ausdehnung der Lichtquelle auf der Netzhaut geringer. Die Lichtquelle wird somit bei großen Entfernungen näherungsweise als Punktquelle wahrgenommen.at greater distances, however, is the perception the spatial extent of the light source on the retina lower. The light source is thus at great distances Approximately perceived as a point source.
Erfindungsgemäß werden
nun mehrere verschiedene Gruppen von LEDs der Lichtquelle mit geeignet
phasenverschobenen PWM-Signalen, wie sie in
Als
ideal ist in diesem Fall das in
Auch ein weit entfernter Betrachter, der seinen Blick über eine so angesteuerte Lichtquelle bewegt, wird dementsprechend eine durchgehende Bewegung bzw. ein durchgehendes Lichtband wahrnehmen.Also a distant observer looking over at one moved so controlled light source is accordingly a continuous Perceive movement or a continuous band of light.
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 10027478 A1 [0002] - DE 10027478 A1 [0002]
- - EP 1447650 A1 [0003] EP 1447650 A1 [0003]
- - EP 1594346 A2 [0004] EP 1594346 A2 [0004]
- - WO 2007107958 A1 [0005] WO 2007107958 A1 [0005]
- - WO 9411712 A1 [0006, 0006] - WO 9411712 A1 [0006, 0006]
- - WO 2008006518 A1 [0007] - WO 2008006518 A1 [0007]
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008027148A DE102008027148A1 (en) | 2008-06-03 | 2008-06-03 | Method for operating light source of motor vehicle, particularly tail-lamp of motor vehicle, involves applying light emitting diodes as illuminant, and controlling multiple light emitting diodes separately |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008027148A DE102008027148A1 (en) | 2008-06-03 | 2008-06-03 | Method for operating light source of motor vehicle, particularly tail-lamp of motor vehicle, involves applying light emitting diodes as illuminant, and controlling multiple light emitting diodes separately |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102008027148A1 true DE102008027148A1 (en) | 2009-12-10 |
Family
ID=41268813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102008027148A Ceased DE102008027148A1 (en) | 2008-06-03 | 2008-06-03 | Method for operating light source of motor vehicle, particularly tail-lamp of motor vehicle, involves applying light emitting diodes as illuminant, and controlling multiple light emitting diodes separately |
Country Status (1)
Country | Link |
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DE (1) | DE102008027148A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010046795A1 (en) * | 2010-09-28 | 2012-03-29 | E:Cue Control Gmbh | Method for operating LED light, involves operating modulation units with pulse-width modulated operating current, where pulse-width-modulated operating current comprises uniform time period and different phase shifts |
DE102012219817A1 (en) * | 2012-10-30 | 2014-04-30 | Zumtobel Lighting Gmbh | Method for operating a light source with a plurality of LEDs or LED groups |
US9433048B2 (en) | 2014-10-24 | 2016-08-30 | Automotive Lighting Italia S.P.A. | Method for controlling a motor vehicle lighting device that uses LEDs |
DE102021120419B3 (en) | 2021-06-30 | 2022-09-15 | Elmos Semiconductor Se | Avoiding a stroboscopic effect of lamp applications |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994011712A1 (en) | 1992-11-16 | 1994-05-26 | Siemens Aktiengesellschaft | Illumination standard |
DE10027478A1 (en) | 2000-06-02 | 2001-12-06 | Hella Kg Hueck & Co | Lighting device for a motor vehicle |
EP1447650A1 (en) | 2003-02-12 | 2004-08-18 | Goodrich Hella Aerospace Lighting Systems GmbH | Method for the determination of the effective luminous intensity of a pulsed LED light source |
DE19945546B4 (en) * | 1999-09-23 | 2005-06-23 | Reitter & Schefenacker Gmbh & Co. Kg | Method for controlling lamps of vehicles, preferably of motor vehicles, and device for carrying out the method |
EP1594346A2 (en) | 2004-05-07 | 2005-11-09 | Hella KGaA Hueck & Co. | Method for control of a vehicle turning indicator |
WO2007107958A1 (en) | 2006-03-21 | 2007-09-27 | Nxp B.V. | Pulse width modulation based led dimmer control |
US20070247072A1 (en) * | 2006-04-21 | 2007-10-25 | Denso Corporation | Illumination device |
WO2008006518A1 (en) | 2006-07-08 | 2008-01-17 | Hella Kgaa Hueck & Co. | Circuit arrangement for electrically triggering a motor vehicle headlight |
-
2008
- 2008-06-03 DE DE102008027148A patent/DE102008027148A1/en not_active Ceased
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994011712A1 (en) | 1992-11-16 | 1994-05-26 | Siemens Aktiengesellschaft | Illumination standard |
DE19945546B4 (en) * | 1999-09-23 | 2005-06-23 | Reitter & Schefenacker Gmbh & Co. Kg | Method for controlling lamps of vehicles, preferably of motor vehicles, and device for carrying out the method |
DE10027478A1 (en) | 2000-06-02 | 2001-12-06 | Hella Kg Hueck & Co | Lighting device for a motor vehicle |
EP1447650A1 (en) | 2003-02-12 | 2004-08-18 | Goodrich Hella Aerospace Lighting Systems GmbH | Method for the determination of the effective luminous intensity of a pulsed LED light source |
EP1594346A2 (en) | 2004-05-07 | 2005-11-09 | Hella KGaA Hueck & Co. | Method for control of a vehicle turning indicator |
WO2007107958A1 (en) | 2006-03-21 | 2007-09-27 | Nxp B.V. | Pulse width modulation based led dimmer control |
US20070247072A1 (en) * | 2006-04-21 | 2007-10-25 | Denso Corporation | Illumination device |
WO2008006518A1 (en) | 2006-07-08 | 2008-01-17 | Hella Kgaa Hueck & Co. | Circuit arrangement for electrically triggering a motor vehicle headlight |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010046795A1 (en) * | 2010-09-28 | 2012-03-29 | E:Cue Control Gmbh | Method for operating LED light, involves operating modulation units with pulse-width modulated operating current, where pulse-width-modulated operating current comprises uniform time period and different phase shifts |
DE102012219817A1 (en) * | 2012-10-30 | 2014-04-30 | Zumtobel Lighting Gmbh | Method for operating a light source with a plurality of LEDs or LED groups |
US9433048B2 (en) | 2014-10-24 | 2016-08-30 | Automotive Lighting Italia S.P.A. | Method for controlling a motor vehicle lighting device that uses LEDs |
DE102021120419B3 (en) | 2021-06-30 | 2022-09-15 | Elmos Semiconductor Se | Avoiding a stroboscopic effect of lamp applications |
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