DE19848925B4 - Method and circuit arrangement for controlling light-emitting diodes - Google Patents
Method and circuit arrangement for controlling light-emitting diodes Download PDFInfo
- Publication number
- DE19848925B4 DE19848925B4 DE19848925A DE19848925A DE19848925B4 DE 19848925 B4 DE19848925 B4 DE 19848925B4 DE 19848925 A DE19848925 A DE 19848925A DE 19848925 A DE19848925 A DE 19848925A DE 19848925 B4 DE19848925 B4 DE 19848925B4
- Authority
- DE
- Germany
- Prior art keywords
- brightness
- emitting diodes
- flow
- flow stream
- circuit arrangement
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
- G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
- G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
- G09G3/14—Semiconductor devices, e.g. diodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- 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
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
- G09G3/2081—Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation
Abstract
Verfahren zur Ansteuerung von Leuchtdioden, bei dem der Flussstrom durch die Leuchtdioden zur Reduzierung der Helligkeit einer Anzeigevorrichtung verringert wird, dadurch gekennzeichnet, dass der Betrag des Flussstromes (I) durch die Leuchtdioden (1) nur bis zu einem vorbestimmten unteren Grenzwert verringert wird, und dass zur weiteren Reduzierung der Helligkeit der Flussstrom (I) getaktet wird, wobei der Betrag des Flussstromes gleich oder größer als der untere Grenzwert ist.Method for driving light-emitting diodes, in which the flow stream through the light-emitting diodes for reducing the brightness of a display device is reduced, characterized in that the amount of the flow current (I) is reduced by the light-emitting diodes (1) only up to a predetermined lower limit, and in that, in order to further reduce the brightness, the flow stream (I) is clocked, the amount of the flow stream being equal to or greater than the lower limit value.
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Ansteuerung von Leuchtdioden (LEDs) nach dem Oberbegriff von Patentanspruch 1 sowie eine Schaltungsanordnung zur Durchführung dieses Verfahrens.The The present invention relates to a method for driving Light-emitting diodes (LEDs) according to the preamble of patent claim 1 and also a circuit arrangement for carrying out this method.
LEDs werden häufig für Anzeigevorrichtungen, wie Displays oder dergleichen, eingesetzt. Eine solche, mit LEDs bestückte Anzeigevorrichtung sollte eine möglichst homogene und gleichmäßige Helligkeit aufweisen, um die anzuzeigende Information für einen Betrachter gut lesbar zu machen. Hierbei geht man davon aus, dass das menschliche Auge Helligkeits- bzw. Intensitätsunterschiede erst dann wahrnimmt, wenn die zu vergleichenden Intensitäten oder Lichtstärken (gemessen in Candela [cd]) um mehr als 100% differieren, d. h. wenn das Verhältnis der Intensitäten größer als 1:2 ist.LEDs become common for display devices, as displays or the like used. Such, with LEDs stocked Display device should be as possible homogeneous and uniform brightness to make the information to be displayed well readable for a viewer close. Here it is assumed that the human eye Brightness or intensity differences only then perceives when the intensities or light intensities to be compared (measured in Candela [cd]) differ by more than 100%, d. H. if the ratio of intensities greater than 1: 2 is.
Aus diesem Grunde werden die auf Anzeigevorrichtungen eingesetzten LEDs in der Regel als selektierte Ware in bestimmten, so genannten Helligkeitsklassen angeboten bzw. bezogen. Diese Helligkeitsklassen sind dadurch definiert, dass der maximale Intensitätsunterschied der LEDs in einer solchen Klasse bei einem festgelegten Flussstrom, beispielsweise einem konstanten Gleichstrom I = 20 mA, höchstens 2:1 beträgt. Die Bestückung einer Anzeigefläche mit LEDs aus einer Helligkeitsklasse führt also zu dem gewünschten Ergebnis, bei einem festgelegten Flussstrom eine homogene Helligkeitsverteilung auf der Anzeigevorrichtung zu erzielen.Out For this reason, the LEDs used on display devices become usually as a selected product in certain, so-called brightness classes offered or purchased. These brightness classes are defined by that the maximum intensity difference the LEDs in such a class at a fixed flux current, for example, a constant direct current I = 20 mA, at most 2: 1. The equipment a display area with LEDs from a brightness class thus leads to the desired Result, with a defined flow stream a homogeneous brightness distribution to achieve on the display device.
Ein Nachteil dieses Selektionsverfahrens tritt dann auf, wenn die Helligkeit der Anzeigevorrichtung den Umgebungsbedingungen angepasst werden muss. Beispielsweise muss eine außenseitig installierte Anzeigevorrichtung, wie zum Beispiel ein DFI-Anzeiger für Fahrgastinformationen, bei direkter Sonneneinstrahlung auf ihre größtmögliche Helligkeit eingestellt werden, um erkennbar und ablesbar zu bleiben. Bei Dunkelheit hingegen muss die Helligkeit der Anzeigevorrichtung verringert werden, da die LEDs ansonsten derart überstrahlen, dass die dargestellte Information nicht mehr für den Betrachter erkennbar ist.One Disadvantage of this selection process occurs when the brightness the display device must be adapted to the ambient conditions. For example, one must be outside installed display device, such as a DFI indicator for passenger information, set to their maximum brightness in direct sunlight to be recognizable and readable. In the dark, however the brightness of the display device must be reduced because otherwise overshadow the LEDs, that the displayed information is no longer recognizable to the viewer is.
Die
Anpassung der Helligkeit der LEDs wird herkömmlicherweise über eine Änderung
des Flussstromes durch die LEDs vorgenommen (vgl. z. B.
Allerdings ist das obige Selektionsverfahren nur bei einem diskreten Flussstrom bzw. in einem bestimmten eingeschränkten Bereich des Flussstromes gültig. Dies hat zur Folge, dass die Intensitäten der LEDs bei einer Ansteuerung der LEDs mit geringeren Flussströmen zum Zwecke einer Helligkeitsreduzierung je nach Halbleitermaterial auseinander driften. Dies bedeutet, dass der bei dem festgelegten Flussstrom maximale Intensitätsunterschied zwischen den einzelnen LEDs innerhalb einer Helligkeitsklasse bei geringeren Flussströmen den Wert von 2:1 übersteigt. Dieser bei geringeren Flussströmen auftretende Intensitätsunterschied ist wiederum vom menschlichen Auge erkennbar und die auf der Anzeigevorrichtung dargestellte Information wird mit abnehmender Helligkeit zunehmend fleckiger und schwerer lesbar.Indeed For example, the above selection procedure is only for a discrete flow stream or in a certain restricted area of the flow stream. This has the consequence that the intensities the LEDs when driving the LEDs with lower flux currents for Purpose of brightness reduction depending on the semiconductor material apart drift. This means that at the specified flow stream maximum intensity difference between the individual LEDs within a brightness class at lower river flows exceeds the value of 2: 1. This at lower flow rates occurring intensity difference in turn is visible to the human eye and that on the display device The information shown increases with decreasing brightness more spotty and difficult to read.
Würde man das Intensitätsverhalten der LEDs andererseits über weitere Bereiche des Flussstromes berücksichtigen wollen, so würde dies zu einer Unmenge von Helligkeitsklassen führen. Diese Lösung ist sowohl aus herstellungstechnischen als auch aus wirtschaftlichen Gründen nicht anzustreben.Would you the intensity behavior the LEDs on the other hand over want to take into account other areas of the flow stream, it would lead to a plethora of brightness classes. This solution is both manufacturing and economic establish not to strive for.
Weiterhin
ist ein Verfahren bekannt, bei dem die Helligkeit der LEDs ausschließlich über eine
Modulation der Pulsweite der AN/AUS-Ansteuerung der LEDs eingestellt
wird (vgl. z. B.
Ausgehend von diesem Stand der Technik ist es eine Aufgabe der Erfindung, ein Verfahren zur Ansteuerung von Leuchtdioden bereitzustellen, das die oben beim Stand der Technik beschriebenen Nachteile vermeidet und insbesondere über einen weiten Helligkeitsbereich eine homogene, gleichmäßige Helligkeitsverteilung der Leuchtdioden gewährleistet.outgoing from this prior art it is an object of the invention to provide a method of driving light emitting diodes, which avoids the disadvantages described above in the prior art and especially about a wide range of brightness a homogeneous, uniform brightness distribution ensured the LEDs.
Diese
Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruches
Dadurch dass der Betrag des Flussstromes durch die Leuchtdioden auch zur Reduzierung der Helligkeit nicht unter einen vorbestimmten unteren Grenzwert abfällt, bei dem zweckmäßigerweise der maximale Intensitätsunterschied der Leuchtdioden noch innerhalb einer Helligkeitsklasse liegt, wird eine für das menschliche Auge homogene Helligkeitsverteilung der Anzeige gewährleistet. Um aber dennoch eine weitere Reduzierung der Helligkeit der Anzeige zu erreichen, wird der Flussstrom getaktet, wobei der Betrag des Flussstromes gleich oder größer als der untere, Grenzwert ist.The fact that the amount of the flux through the light emitting diodes does not fall below a predetermined lower limit also for reducing the brightness, in which advantageously the maximum intensity difference of the light emitting diodes is still within a brightness class, ensures a brightness distribution of the display which is homogeneous for the human eye. But still a further reduction in the brightness of the display to reach, the flow stream is clocked, wherein the amount of the flow stream is equal to or greater than the lower limit.
Die resultierende Helligkeit der Anzeige wird in diesem Arbeitsbereich somit durch das Verhältnis zwischen den Zeitdauern von eingeschaltetem und ausgeschaltetem Flussstrom bestimmt. Mittels dieses Verfahrens ist es möglich, kleinste Helligkeiten bei einer absolut homogenen und gleichmäßig hellen Anzeige zu erzielen.The resulting brightness of the display is in this workspace thus by the relationship between the durations of switched on and off flow certainly. By means of this method it is possible to contribute the smallest brightnesses an absolutely homogeneous and uniformly bright display.
Vorzugsweise ist die Taktfrequenz des Flussstromes in diesem Arbeitsbereich größer als 60 Hz, sodass die tatsächlichen AN/AUS-Phasen der Leuchtdioden vom menschlichen Auge nicht wahrnehmbar sind und vom Betrachter nur als effektive Verminderung der Helligkeit erkannt werden.Preferably is the clock frequency of the flow in this work area greater than 60 Hz, so the actual On / off phases of LEDs are imperceptible to the human eye are and by the viewer only as an effective reduction in brightness be recognized.
Die zur Durchführung des oben beschriebenen Verfahrens der Erfindung ausgebildete Schaltungsanordnung weist neben einer Regeleinrichtung zum Regeln des Betrages des Flussstromes durch die Leuchtdioden noch ein Schaltmittel zum Takten des Flussstromes auf, welches vorzugsweise mit einer Taktfrequenz größer als 60 Hz ansteuerbar ist.The to carry out The circuit arrangement formed by the method of the invention described above has in addition to a control device for controlling the amount of the flow stream through the LEDs still a switching means for clocking the flow stream which preferably has a clock frequency greater than 60 Hz can be controlled.
Weitere Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand weiterer Unteransprüche.Further Embodiments and developments of the invention are the subject further dependent claims.
Die
vorliegende Erfindung wird im Folgenden anhand eines bevorzugten
Ausführungsbeispieles mit
Bezugnahme auf die beiliegende Zeichnung näher beschrieben. Darin zeigt
die einzige
Mit
einer derartigen Schaltungsanordnung
Die
Schaltungsanordnung
Zur
Regelung des Betrages des Flussstromes
Die
regelbare Stromquelle
Der
Betrag des von der regelbaren Stromquelle
Der
Flussstrom I wird allerdings nur bis zu einem unteren Grenzwert
reduziert, bei dem die Strahlungsemissionen der LEDs noch innerhalb
einer Helligkeitsklasse liegen. Um die Helligkeit der Anzeigeinformation
dennoch weiter zu reduzieren und gleichzeitig eine homogene und
gleichmäßige Helligkeitsverteilung
der Anzeigeinformation auch im unteren Arbeitsbereich B sicherzustellen,
erfolgt die Ansteuerung der LEDs
Im
Arbeitsbereich B wird die regelbare Stromquelle
Das
Takten des Flussstromes
Eine
derartige Ansteuerung der LEDs
Um
das zweite Schaltmittel
Das
Steuersignal BRT wird einem Register
Zur
Pulsweitenmodulation (PWM) benötigt die
PWM-Steuereinrichtung
In
diesem Zusammenhang ist es auch von Vorteil, aus schaltungstechnischen
Gründen
in jedem IC oder ASIC nur ein serielles Empfangsregister
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19848925A DE19848925B4 (en) | 1998-10-23 | 1998-10-23 | Method and circuit arrangement for controlling light-emitting diodes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19848925A DE19848925B4 (en) | 1998-10-23 | 1998-10-23 | Method and circuit arrangement for controlling light-emitting diodes |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19848925A1 DE19848925A1 (en) | 2000-04-27 |
DE19848925B4 true DE19848925B4 (en) | 2010-04-29 |
Family
ID=7885416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19848925A Expired - Fee Related DE19848925B4 (en) | 1998-10-23 | 1998-10-23 | Method and circuit arrangement for controlling light-emitting diodes |
Country Status (1)
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DE (1) | DE19848925B4 (en) |
Cited By (3)
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DE102013224760A1 (en) | 2013-12-03 | 2015-06-03 | Tridonic Gmbh & Co Kg | Driver circuit and method for operating a dimmable LED track in a dimming area with two areas |
US9137875B2 (en) | 2010-08-26 | 2015-09-15 | Osram Gmbh | Method for operating at least one light-emitting diode and lighting device for carrying out the method |
DE102015205808A1 (en) | 2015-03-31 | 2016-10-06 | Osram Gmbh | Circuit arrangement for operating at least a first and exactly a second cascade of LEDs |
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DE102004001862B3 (en) * | 2004-01-13 | 2005-09-15 | Kwl-Lighting Gmbh | Control device for controlling a lighting element has first and second signal converters with respective threshold values |
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DE102004010942B3 (en) * | 2004-03-05 | 2005-10-13 | Kwl-Lighting Gmbh | Control device and control process for the control of luminaries features an electrical circuit that reduces the perception of the brightness change |
DE102004062727B3 (en) * | 2004-12-27 | 2006-04-06 | Insta Elektro Gmbh | Electric circuit arrangement esp. for dimming series connected LEDs, has controlled voltage source connected in series with LEDs |
DE102004062728B3 (en) * | 2004-12-27 | 2006-04-06 | Insta Elektro Gmbh | Electric/electronic circuit structure for dimming multiple LEDs connected in series has a controllable source of current and a clock generator for pulse-width modulation of LED supply voltage |
DE102006010311B3 (en) * | 2006-03-07 | 2007-10-04 | SCEMTEC Hard- und Software für Mess- und Steuerungstechnik GmbH | Arrangement for control of light emitting diode mechanism, has storage area, which comprises two look-up charts, where former chart comprises multiple time intervals for determining time intervals between two signal changes at outlet port |
US20090160364A1 (en) | 2006-04-12 | 2009-06-25 | Koninklijke Philips Electronics N V | Operating solid-state lighting elements |
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DE102013201438A1 (en) * | 2013-01-29 | 2014-07-31 | Osram Gmbh | Circuit arrangement and method for operating and dimming at least one LED |
DE102013105463B3 (en) * | 2013-05-28 | 2014-11-06 | Vossloh-Schwabe Deutschland Gmbh | Operating device and method for operating a dimmable lamp arrangement |
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DE102013224760A1 (en) | 2013-12-03 | 2015-06-03 | Tridonic Gmbh & Co Kg | Driver circuit and method for operating a dimmable LED track in a dimming area with two areas |
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DE102013224760B4 (en) | 2013-12-03 | 2022-09-29 | Tridonic Gmbh & Co Kg | Driver circuit and method for operating a dimmable LED line in a two-zone dimming range |
DE102015205808A1 (en) | 2015-03-31 | 2016-10-06 | Osram Gmbh | Circuit arrangement for operating at least a first and exactly a second cascade of LEDs |
Also Published As
Publication number | Publication date |
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DE19848925A1 (en) | 2000-04-27 |
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