EP2217040B1 - Display device, operating method and lighting device - Google Patents

Display device, operating method and lighting device Download PDF

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Publication number
EP2217040B1
EP2217040B1 EP10152419A EP10152419A EP2217040B1 EP 2217040 B1 EP2217040 B1 EP 2217040B1 EP 10152419 A EP10152419 A EP 10152419A EP 10152419 A EP10152419 A EP 10152419A EP 2217040 B1 EP2217040 B1 EP 2217040B1
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EP
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Prior art keywords
light
demultiplexer
display device
pulse
pulse width
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EP10152419A
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German (de)
French (fr)
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EP2217040A1 (en
Inventor
Dominik Heggen
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e cue control GmbH
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e cue control GmbH
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    • 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
    • H05B45/37—Converter 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]
    • H05B45/20—Controlling the colour of the light
    • 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
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • a method of operating a display device is provided.
  • the problem to be solved is to provide a particularly power-saving method for operating a display device.
  • the invention relates to an operating method according to claim 1.
  • a display device is indicated. By means of the display device, it is possible, for example, to display the operating state of a connected device.
  • the display device can be part of an operating device by means of which the device can be operated and controlled by the user.
  • the display device comprises a pulse width modulation circuit.
  • the Pulse width modulation circuit generates a pulse width modulated signal.
  • the pulse width modulated signal has a switch-on time in which a connected device is supplied with power by the pulse width modulation circuit and a switch-off time during which the connected device is not supplied with current, for example.
  • the display device has a demultiplexer.
  • the demultiplexer comprises at least one signal input and at least two signal outputs.
  • the demultiplexer includes exactly one signal input and a plurality of signal outputs.
  • the demultiplexer includes more signal outputs than signal inputs.
  • the demultiplexer is connected to the pulse width modulation circuit at its signal input. That is, the pulse width modulated signal generated by the pulse width modulation circuit is impressed into the demultiplexer via the signal input.
  • the display device comprises at least two light-emitting diodes which are each connected to a signal output of the demultiplexer. That is, the LEDs are powered by the demultiplexer with operating current.
  • the demultiplexer switches the input signal of the pulse width modulation circuit to one of the signal outputs, which is connected to a light emitting diode. This way will then this LED is energized with the pulse width modulated signal.
  • the display device comprises a pulse width modulation circuit and a demultiplexer which has at least one signal input and at least two signal outputs, the signal input being connected to the pulse width modulation circuit.
  • the display device further comprises at least two light-emitting diodes which are each connected to a signal output of the demultiplexer.
  • a display device which is intended to display the operating state of, for example, several connected devices may have a multiplicity of light-emitting diodes for displaying the operating state. If all LEDs of the display device are energized at the same time, then the display device has a relatively high power consumption.
  • the display device described here is based inter alia on the recognition that - due to the inertia of the human eye - the light emitting diodes of the display device does not necessarily have to be operated simultaneously to give the viewer the impression that they light up at the same time. Rather, it is sufficient to operate only one of the light-emitting diodes, while the remaining light-emitting diodes are not energized.
  • the viewer gets the impression that all the LEDs of the display device light up at the same time. In actual fact, however, only one LED lights up in each case, the power consumption is reduced to one nth of the power consumption, which would have the display device when all the LEDs are operated simultaneously, where n is the number of LEDs of the display device.
  • the demultiplexer has a control input which is connected to a control input of the pulse width modulation circuit.
  • demultiplexer and pulse width modulation circuit are synchronized with each other. In this way, it can be ensured, for example, that each light-emitting diode of the display device is operated with the pulse-width-modulated signal intended for it. Furthermore, it can be ensured that the demultiplexer is switched from one signal output to the next, that is to say from one light-emitting diode to the next, in the turn-off time of the pulse-width-modulated signal. In this way, unpleasant flashes of light when turning on the LEDs can be avoided.
  • each of the light-emitting diodes of the display device comprises at least two light-emitting diode chips.
  • each light-emitting diode comprises a light-emitting diode chip emitting red light, a green light-emitting light-emitting diode chip, and a blue light-emitting light-emitting diode chip.
  • Each LED chip is with a Signal output of the demultiplexer one-uniquely connected. That is, each signal output of the demultiplexer is associated with exactly one LED chip in this embodiment, and each LED chip is associated with exactly one signal output of the demultiplexer. In this way, it is possible that the LED chips of a light emitting diode can be operated independently. Thus, for example, by means of RGB LEDs, a specific color location of the light generated by the light emitting diode can be set.
  • the power consumption of the display device is at most 0.5 W.
  • the display device comprises eight or more light-emitting diodes. This is made possible in particular by the fact that the LEDs of the display device are not operated simultaneously, but sequentially.
  • a method for operating a display device having at least two light-emitting diodes is provided.
  • the display device may be, for example, a display device described here. That is, all features described in connection with the display device are also disclosed in connection with the method for operating a display device, and vice versa.
  • the method has the method step, after which a pulse-width-modulated signal is generated which has a switch-on time and a switch-off time.
  • the pulse-width-modulated signal has a multiplicity of switch-on times and switch-off times which, for example, follow one another periodically.
  • the at least two light emitting diodes are operated by means of the pulse width modulated signal.
  • one of the light-emitting diodes is then energized in forward voltage, in the switch-off time, the light-emitting diode is not energized, or it is energized with a low current in the reverse direction.
  • the pulse width modulated signal is generated by means of a pulse width modulation circuit.
  • the method comprises the method step, after which the pulse width modulated signal is passed to a demultiplexer.
  • a signal output of the pulse width modulation circuit is connected to a signal input of the demultiplexer.
  • the method comprises a method step in which the pulse width modulation circuit and the demultiplexer are synchronized, such that the pulse width modulated signal is passed from the demultiplexer to a light emitting diode from the at least two light emitting diodes during a turn off time. That is, the demultiplexer sequentially switches, for example, the LEDs of the display device and connects them each with one of its signal outputs. The switching from one light-emitting diode to another light-emitting diode preferably takes place during the turn-off time of the pulse-width-modulated signal. In this way, unpleasant flashes of light when switching from one LED to the next can be avoided.
  • no flashes of light occur between the switching from one light-emitting diode to the next light-emitting diode.
  • the next light-emitting diode is switched on in time only after the switching by the pulse-width-modulated signal and not during the switching from the previous light-emitting diode to the next light-emitting diode.
  • At least one of the light-emitting diodes has at least two light-emitting diode chips.
  • all of the light-emitting diodes of the display device are so-called RGB light-emitting diodes, each of which comprises a red light, a blue light and a green light-emitting light-emitting diode chip.
  • Per LED chip is doing a pulse width modulated signal to the LED passed.
  • the pulse width modulation circuit is suitable, for example, for simultaneously generating three different pulse width modulated signals.
  • the light-emitting diode chips of the light-emitting diode can be operated sequentially. That is, the demultiplexer not only switches between the individual LEDs, but between the individual LED chips. In this way, the display device can be operated particularly energy-saving, since only a single LED chip is energized at a certain time.
  • the pulse-width-modulated signal is conducted by the demultiplexer sequentially to the at least two light-emitting diodes. That is, the LEDs of the display device are sequentially operated one by one, and none of the LEDs of the display device is operated at the same time as another LED of the display device. It is, as just stated, also possible that the LED chips of the LEDs are also operated individually.
  • the light-emitting diode chips of the at least two light-emitting diodes of the display device are each operated at the maximum permissible current intensity during the turn-on time of the pulse-width-modulated signal. Due to the sequential operation of the light-emitting diodes and / or the light-emitting diode chips of the display device, the light generated by the light-emitting diodes overall seems less bright than when all the light-emitting diodes are operated simultaneously.
  • the LEDs are operated during the short time they are operated at the maximum allowable for them current. Since the operation of the light-emitting diodes or the LED chips always takes place only briefly, thereby the life of the light-emitting diodes is hardly or not negatively influenced. On the other hand, the brightness loss due to the sequential operation by this measure can be compensated so strong that the viewer is hardly a decrease in brightness is detected.
  • a lighting device and a display device.
  • this is a display device described here, so that all features described in connection with the display device are also disclosed in connection with the lighting device.
  • the lighting device comprises, in addition to the display device, at least one lamp which is connected to the display device, wherein the display device is provided to indicate an operating state of the at least one lamp. It is possible the display device displays, for example, the following properties of the light generated by the lamp: color location, color temperature and / or brightness.
  • the FIG. 1 shows a schematic representation of a first embodiment of a display device described here.
  • the display device comprises a pulse width modulation circuit 1.
  • the pulse width modulation circuit 1 has a signal output 12 and a control input 13.
  • the pulse width modulation circuit 1 generates a pulse width modulated signal 10.
  • the pulse width modulated signal 10 has switch-on times t1 and switch-off times t2.
  • the pulse width modulated signal 10 is formed in the manner of a rectangular pulse.
  • the display device further comprises a demultiplexer 2.
  • the demultiplexer 2 has a signal input 21. Further the demultiplexer 2 has a multiplicity of signal outputs 22. Finally, the demultiplexer has a control input 23.
  • the pulse width modulation circuit 1 and the demultiplexer 2 are connected to each other via the signal output 12 of the pulse width modulation circuit 1 and the signal input 21 of the demultiplexer 2.
  • the display device furthermore has a multiplicity of light-emitting diodes 3.
  • the light-emitting diodes 3 are RGB light-emitting diodes which have three light-emitting diode chips 30, one of which generates red, one blue and one green light during operation.
  • Each of the light-emitting diode chips 30 is uniquely connected to the demultiplexer 2 via the signal outputs 22. That is, the number of signal outputs 22 corresponds, for example, three times the number of LEDs 3 of the display device.
  • a pulse width modulated signal 10 is generated by the pulse width modulation circuit 1.
  • the pulse width modulated signal 10 is impressed by the signal input 21 in the demultiplexer 2, which switches the pulse width modulated signal 10 to exactly one of its signal outputs 22, so that a switched pulse width modulated signal 20 is sent to one of the LED chips 30.
  • the demultiplexer 2 and the pulse width modulation circuit 1 are synchronized with each other, so that the switching from a light-emitting diode chip 30 to the next light-emitting diode chip 30 takes place during the turn-off time t2. In this way, an unpleasant flash of the LED chips 30 during the switching process is prevented.
  • the LED chips 30 are successively, that is, sequentially applied in rapid succession each with a pulse width modulated signal, so that the switching of the observer due to the inertia of the human eye is not noticeable.
  • the pulse width modulation circuit 1 generates a plurality of pulse width modulated signals 10, wherein the number of signals 10 corresponds to the number of light-emitting diode chip 30 per LED.
  • the light-emitting diode chips 30 of a single light-emitting diode can each be operated simultaneously, so that a sequential switching does not take place between individual light-emitting diode chips but between individual light-emitting diodes.
  • the FIG. 2 shows a display device 100, as for example in connection with the FIG. 1 is explained in more detail.
  • the display device 100 comprises twelve individual light-emitting diodes 3, which are each arranged behind a viewing window 140.
  • the display device comprises a control panel 31, on which operating elements 120 are arranged, which can be activated by touching the control panel 31.
  • the control panel 31 is a glass surface, behind which capacitive switches are arranged in the region of the control elements 120.
  • An operating arrangement with such a control panel is for example in the publications DE 10 2005 059 067 A1 and DE 10 2007 017 335 A1 explained in more detail.
  • the display device is connected to one or more lamps 200, which may each have a plurality of light-emitting diodes 201.
  • the operating state of the lamps 200 can be displayed.
  • each control element can be associated with exactly one lamp whose operating state is indicated by the light-emitting diode 3.

Description

Es wird ein Verfahren zum Betreiben einer Anzeigevorrichtung angegeben.A method of operating a display device is provided.

Die Druckschrift US 2005/0269580 beschreibt ein Betriebsverfahren nach dem Oberbegriff des Patentanspruch 1.The publication US 2005/0269580 describes an operating method according to the preamble of claim 1.

Die zu lösende Aufgabe besteht darin, ein besonders Strom sparendes Verfahren zum Betreiben einer Anzeigevorrichtung anzugeben.The problem to be solved is to provide a particularly power-saving method for operating a display device.

Die Erfindung betrifft ein Betriebsverfahren nach Anspruch 1.The invention relates to an operating method according to claim 1.

Es wird eine Anzeigevorrichtung angegeben. Mittels der Anzeigevorrichtung ist es beispielsweise möglich, den Betriebszustand eines angeschlossenen Geräts anzuzeigen. Die Anzeigevorrichtung kann dabei Teil einer Bedienvorrichtung sein, mittels der das Gerät vom Benutzer bedienbar und steuerbar ist.A display device is indicated. By means of the display device, it is possible, for example, to display the operating state of a connected device. The display device can be part of an operating device by means of which the device can be operated and controlled by the user.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung umfasst die Anzeigevorrichtung eine Pulsweitenmodulationsschaltung. Die Pulsweitenmodulationsschaltung erzeugt ein pulsweitenmoduliertes Signal. Das pulsweitenmodulierte Signal weist eine Einschaltzeit auf, in der ein angeschlossenes Gerät von der Pulsweitenmodulationsschaltung mit Strom versorgt wird und eine Ausschaltzeit, während der das angeschlossene Gerät beispielsweise nicht mit einem Strom versorgt wird.In accordance with at least one embodiment of the display device, the display device comprises a pulse width modulation circuit. The Pulse width modulation circuit generates a pulse width modulated signal. The pulse width modulated signal has a switch-on time in which a connected device is supplied with power by the pulse width modulation circuit and a switch-off time during which the connected device is not supplied with current, for example.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung weist die Anzeigevorrichtung einen Demultiplexer auf. Der Demultiplexer umfasst zumindest einen Signaleingang und zumindest zwei Signalausgänge. Beispielsweise umfasst der Demultiplexer genau einen Signaleingang und eine Vielzahl von Signalausgängen. In jedem Fall umfasst der Demultiplexer mehr Signalausgänge als Signaleingänge. Mittels des Demultiplexers wird ein Eingangssignal auf genau einen von mehreren Ausgängen geschaltet.In accordance with at least one embodiment of the display device, the display device has a demultiplexer. The demultiplexer comprises at least one signal input and at least two signal outputs. For example, the demultiplexer includes exactly one signal input and a plurality of signal outputs. In any case, the demultiplexer includes more signal outputs than signal inputs. By means of the demultiplexer, an input signal is switched to exactly one of several outputs.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung ist der Demultiplexer mit der Pulsweitenmodulationsschaltung an seinem Signaleingang verbunden. Das heißt, das von der Pulsweitenmodulationsschaltung erzeugte pulsweitenmodulierte Signal wird über den Signaleingang in den Demultiplexer eingeprägt.In accordance with at least one embodiment of the display device, the demultiplexer is connected to the pulse width modulation circuit at its signal input. That is, the pulse width modulated signal generated by the pulse width modulation circuit is impressed into the demultiplexer via the signal input.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung umfasst die Anzeigevorrichtung zumindest zwei Leuchtdioden, die jeweils mit einem Signalausgang des Demultiplexers verbunden sind. Das heißt, die Leuchtdioden werden vom Demultiplexer mit Betriebsstrom versorgt. Der Demultiplexer schaltet das Eingangssignal der Pulsweitenmodulationsschaltung auf einen der Signalausgänge, der mit einer Leuchtdiode verbunden ist. Auf diese Weise wird dann diese Leuchtdiode mit dem pulsweitenmodulierten Signal bestromt.In accordance with at least one embodiment of the display device, the display device comprises at least two light-emitting diodes which are each connected to a signal output of the demultiplexer. That is, the LEDs are powered by the demultiplexer with operating current. The demultiplexer switches the input signal of the pulse width modulation circuit to one of the signal outputs, which is connected to a light emitting diode. This way will then this LED is energized with the pulse width modulated signal.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung umfasst die Anzeigevorrichtung eine Pulsweitenmodulationsschaltung und einen Demultiplexer, der zumindest einen Signaleingang und zumindest zwei Signalausgänge aufweist, wobei der Signaleingang mit der Pulsweitenmodulationsschaltung verbunden ist. Die Anzeigevorrichtung umfasst ferner zumindest zwei Leuchtdioden, die jeweils mit einem Signalausgang des Demultiplexers verbunden sind.In accordance with at least one embodiment of the display device, the display device comprises a pulse width modulation circuit and a demultiplexer which has at least one signal input and at least two signal outputs, the signal input being connected to the pulse width modulation circuit. The display device further comprises at least two light-emitting diodes which are each connected to a signal output of the demultiplexer.

Die hier beschriebene Anzeigevorrichtung macht dabei unter anderem von der folgenden Idee Gebrauch: Eine Anzeigevorrichtung, die den Betriebszustand beispielsweise mehrerer angeschlossener Geräte anzeigen soll, kann zum Anzeigen des Betriebszustands eine Vielzahl von Leuchtdioden aufweisen. Werden nun sämtliche Leuchtdioden der Anzeigevorrichtung gleichzeitig bestromt, so weist die Anzeigevorrichtung eine relativ hohe Leistungsaufnahme auf.Among other things, the display device described here makes use of the following idea: A display device which is intended to display the operating state of, for example, several connected devices may have a multiplicity of light-emitting diodes for displaying the operating state. If all LEDs of the display device are energized at the same time, then the display device has a relatively high power consumption.

Der hier beschriebenen Anzeigevorrichtung liegt nun unter anderem die Erkenntnis zugrunde, dass - aufgrund der Trägheit des menschlichen Auges - die Leuchtdioden der Anzeigevorrichtung nicht zwangsläufig gleichzeitig betrieben werden müssen, um beim Betrachter den Eindruck zu erwecken, dass sie gleichzeitig leuchten. Vielmehr ist es ausreichend, jeweils nur eine der Leuchtdioden zu betreiben, während die restlichen Leuchtdioden nicht bestromt werden.The display device described here is based inter alia on the recognition that - due to the inertia of the human eye - the light emitting diodes of the display device does not necessarily have to be operated simultaneously to give the viewer the impression that they light up at the same time. Rather, it is sufficient to operate only one of the light-emitting diodes, while the remaining light-emitting diodes are not energized.

Werden die Leuchtdioden der Anzeigevorrichtung abwechselnd einzeln betrieben und geschieht das Betreiben der Leuchtdioden in schneller Abfolge, so entsteht beim Betrachter der Eindruck, dass sämtliche Leuchtdioden der Anzeigevorrichtung gleichzeitig leuchten. Da tatsächlich aber jeweils nur eine Leuchtdiode leuchtet, reduziert sich die Leistungsaufnahme auf ein n-tel der Leistungsaufnahme, welche die Anzeigevorrichtung haben würde, wenn sämtliche Leuchtdioden gleichzeitig betrieben werden, wobei n die Zahl der Leuchtdioden der Anzeigevorrichtung ist.If the light-emitting diodes of the display device are operated alternately individually and the operation of the Light-emitting diodes in rapid succession, the viewer gets the impression that all the LEDs of the display device light up at the same time. In actual fact, however, only one LED lights up in each case, the power consumption is reduced to one nth of the power consumption, which would have the display device when all the LEDs are operated simultaneously, where n is the number of LEDs of the display device.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung weist der Demultiplexer einen Steuereingang auf, der mit einem Steuereingang der Pulsweitenmodulationsschaltung verbunden ist. Über die Verbindung von Demultiplexer und Pulsweitenmodulationsschaltung ist es möglich, dass Demultiplexer und Pulsweitenmodulationsschaltung zueinander synchronisiert werden. Auf diese Weise kann beispielsweise sichergestellt werden, dass jede Leuchtdiode der Anzeigevorrichtung mit dem für sie bestimmten pulsweitenmodulierten Signal betrieben wird. Ferner kann sichergestellt werden, dass ein Schalten des Demultiplexers von einem Signalausgang auf den nächsten, das heißt von einer Leuchtdiode zu der nächsten, in der Ausschaltzeit des pulsweitenmodulierten Signals erfolgt. Auf diese Weise können unangenehme Lichtblitze beim Einschalten der Leuchtdioden vermieden werden.In accordance with at least one embodiment of the display device, the demultiplexer has a control input which is connected to a control input of the pulse width modulation circuit. Through the connection of demultiplexer and pulse width modulation circuit, it is possible that demultiplexer and pulse width modulation circuit are synchronized with each other. In this way, it can be ensured, for example, that each light-emitting diode of the display device is operated with the pulse-width-modulated signal intended for it. Furthermore, it can be ensured that the demultiplexer is switched from one signal output to the next, that is to say from one light-emitting diode to the next, in the turn-off time of the pulse-width-modulated signal. In this way, unpleasant flashes of light when turning on the LEDs can be avoided.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung umfasst jede der Leuchtdioden der Anzeigevorrichtung mindestens zwei Leuchtdiodenchips. Beispielsweise umfasst jede Leuchtdiode einen rotes Licht emittierenden Leuchtdiodenchip, einen grünes Licht emittierenden Leuchtdiodenchip sowie einen blaues Licht emittierenden Leuchtdiodenchip. Jeder Leuchtdiodenchip ist dabei mit einem Signalausgang des Demultiplexers ein-eindeutig verbunden. Das heißt, jedem Signalausgang des Demultiplexers ist in dieser Ausführungsform genau ein Leuchtdiodenchip zugeordnet und jedem Leuchtdiodenchip ist genau ein Signalausgang des Demultiplexers zugeordnet. Auf diese Weise ist es möglich, dass die Leuchtdiodenchips einer Leuchtdiode unabhängig voneinander betrieben werden können. So kann beispielsweise mittels RGB-Leuchtdioden ein bestimmter Farbort des von der Leuchtdiode erzeugten Lichts eingestellt werden.In accordance with at least one embodiment of the display device, each of the light-emitting diodes of the display device comprises at least two light-emitting diode chips. By way of example, each light-emitting diode comprises a light-emitting diode chip emitting red light, a green light-emitting light-emitting diode chip, and a blue light-emitting light-emitting diode chip. Each LED chip is with a Signal output of the demultiplexer one-uniquely connected. That is, each signal output of the demultiplexer is associated with exactly one LED chip in this embodiment, and each LED chip is associated with exactly one signal output of the demultiplexer. In this way, it is possible that the LED chips of a light emitting diode can be operated independently. Thus, for example, by means of RGB LEDs, a specific color location of the light generated by the light emitting diode can be set.

Gemäß zumindest einer Ausführungsform der Anzeigevorrichtung beträgt die Leistungsaufnahme der Anzeigevorrichtung höchstens 0,5 W. Die Anzeigevorrichtung umfasst dabei acht oder mehr Leuchtdioden. Dies ist insbesondere dadurch ermöglicht, dass die Leuchtdioden der Anzeigevorrichtung nicht gleichzeitig, sondern sequentiell betrieben werden.According to at least one embodiment of the display device, the power consumption of the display device is at most 0.5 W. The display device comprises eight or more light-emitting diodes. This is made possible in particular by the fact that the LEDs of the display device are not operated simultaneously, but sequentially.

Gemäß der Erfindung wird ein Verfahren zum Betreiben einer Anzeigevorrichtung, die zumindest zwei Leuchtdioden aufweist, angegeben. Bei der Anzeigevorrichtung kann es sich zum Beispiel um eine hier beschriebene Anzeigevorrichtung handeln. Das heißt, sämtliche in Verbindung mit der Anzeigevorrichtung beschriebenen Merkmale sind auch in Verbindung mit dem Verfahren zum Betreiben einer Anzeigevorrichtung offenbart und umgekehrt.According to the invention, a method for operating a display device having at least two light-emitting diodes is provided. The display device may be, for example, a display device described here. That is, all features described in connection with the display device are also disclosed in connection with the method for operating a display device, and vice versa.

Gemäß zumindest einer Ausführungsform des Verfahrens weist das Verfahren den Verfahrensschritt auf, wonach ein pulsweitenmoduliertes Signal erzeugt wird, das eine Einschaltzeit und eine Ausschaltzeit aufweist. Insbesondere weist das pulsweitenmodulierte Signal eine Vielzahl von Einschaltzeiten und von Ausschaltzeiten auf, die zum Beispiel periodisch aufeinander abfolgen.In accordance with at least one embodiment of the method, the method has the method step, after which a pulse-width-modulated signal is generated which has a switch-on time and a switch-off time. In particular, the pulse-width-modulated signal has a multiplicity of switch-on times and switch-off times which, for example, follow one another periodically.

Beispielsweise werden die zumindest zwei Leuchtdioden mittels des pulsweitenmodulierten Signals betrieben.For example, the at least two light emitting diodes are operated by means of the pulse width modulated signal.

In der Einschaltzeit wird eine der Leuchtdioden dann in Vorwärtsspannung bestromt, in der Ausschaltzeit wird die Leuchtdiode nicht bestromt, oder sie wird mit einer geringen Stromstärke in Sperrrichtung bestromt. Das pulsweitenmodulierte Signal wird dabei mittels einer Pulsweitenmodulationsschaltung erzeugt.In the switch-on time, one of the light-emitting diodes is then energized in forward voltage, in the switch-off time, the light-emitting diode is not energized, or it is energized with a low current in the reverse direction. The pulse width modulated signal is generated by means of a pulse width modulation circuit.

Gemäß zumindest einer Ausführungsform des Verfahrens umfasst das Verfahren den Verfahrensschritt, wonach das pulsweitenmodulierte Signal zu einem Demultiplexer geleitet wird. Beispielsweise ist dazu ein Signalausgang der Pulsweitenmodulationsschaltung mit einem Signaleingang des Demultiplexers verbunden.In accordance with at least one embodiment of the method, the method comprises the method step, after which the pulse width modulated signal is passed to a demultiplexer. For example, a signal output of the pulse width modulation circuit is connected to a signal input of the demultiplexer.

Gemäß zumindest einer Ausführungsform des Verfahrens umfasst das Verfahren einen Verfahrensschritt, in dem die Pulsweitenmodulationsschaltung und der Demultiplexer synchronisiert werden, derart, dass das pulsweitenmodulierte Signal vom Demultiplexer während einer Ausschaltzeit zu einer Leuchtdiode von den zumindest zwei Leuchtdioden geleitet wird. Das heißt, der Demultiplexer schaltet beispielsweise sequentiell die Leuchtdioden der Anzeigevorrichtung durch und verbindet sie jeweils mit einem seiner Signalausgänge. Das Schalten von einer Leuchtdiode zu einer anderen Leuchtdiode erfolgt dabei vorzugsweise während der Ausschaltzeit des pulsweitenmodulierten Signals. Auf diese Weise können unangenehme Lichtblitze beim Schalten von einer Leuchtdiode auf die nächste vermieden werden.In accordance with at least one embodiment of the method, the method comprises a method step in which the pulse width modulation circuit and the demultiplexer are synchronized, such that the pulse width modulated signal is passed from the demultiplexer to a light emitting diode from the at least two light emitting diodes during a turn off time. That is, the demultiplexer sequentially switches, for example, the LEDs of the display device and connects them each with one of its signal outputs. The switching from one light-emitting diode to another light-emitting diode preferably takes place during the turn-off time of the pulse-width-modulated signal. In this way, unpleasant flashes of light when switching from one LED to the next can be avoided.

Das heißt, gemäß einer Ausführungsform des Verfahrens treten zwischen dem Schalten von einer Leuchtdiode auf die nächste Leuchtdiode keine Lichtblitze auf. Die nächste Leuchtdiode wird zeitlich erst nach dem Schalten durch das pulsweitenmodulierte Signal eingeschaltet und nicht während des Schaltens von der vorherigen Leuchtdiode auf die nächste Leuchtdiode.That is, according to an embodiment of the method, no flashes of light occur between the switching from one light-emitting diode to the next light-emitting diode. The next light-emitting diode is switched on in time only after the switching by the pulse-width-modulated signal and not during the switching from the previous light-emitting diode to the next light-emitting diode.

Gemäß zumindest einer Ausführungsform des Verfahrens zum Betreiben einer Anzeigevorrichtung, die zumindest zwei Leuchtdioden umfasst, umfasst das Verfahren die folgenden Schritte, insbesondere in der folgenden Reihenfolge:

  • Erzeugen eines pulsweitenmodulierten Signals, das eine Einschaltzeit und eine Ausschaltzeit aufweist, mittels einer Pulsweitenmodulationsschaltung,
  • Leiten des pulsweitenmodulierten Signals zu einem Demultiplexer,
  • Synchronisieren von Pulsweitenmodulationsschaltung und Demultiplexer, sodass das pulsweitenmodulierte Signal vom Demultiplexer während einer Ausschaltzeit zu einer Leuchtdiode von den zumindest zwei Leuchtdioden geleitet wird.
In accordance with at least one embodiment of the method for operating a display device comprising at least two light-emitting diodes, the method comprises the following steps, in particular in the following order:
  • Generating a pulse width modulated signal having an on time and an off time by means of a pulse width modulation circuit,
  • Directing the pulse width modulated signal to a demultiplexer,
  • Synchronizing pulse width modulation circuit and demultiplexer, so that the pulse width modulated signal is passed from the demultiplexer during a turn-off time to a light emitting diode from the at least two light-emitting diodes.

Gemäß zumindest einer Ausführungsform des Verfahrens weist zumindest eine der Leuchtdioden zumindest zwei Leuchtdiodenchips auf. Beispielsweise handelt es sich bei sämtlichen Leuchtdioden der Anzeigevorrichtung um so genannte RGB-Leuchtdioden, die jeweils einen rotes Licht, einen blaues Licht und einen grünes Licht emittierenden Leuchtdiodenchip umfassen. Pro Leuchtdiodenchip wird dabei ein pulsweitenmoduliertes Signal zur Leuchtdiode geleitet. Dabei ist es möglich, dass gleichzeitig jedem Leuchtdiodenchip der Leuchtdiode ein pulsweitenmoduliertes Signal zugeleitet wird, sodass die Leuchtdiodenchips einer Leuchtdiode gleichzeitig betrieben werden. In diesem Fall ist die Pulsweitenmodulationsschaltung beispielsweise dazu geeignet, gleichzeitig drei unterschiedliche pulsweitenmodulierte Signale zu erzeugen. Beim Schalten von einer Leuchtdiode auf die nächste Leuchtdiode werden dann die drei pulsweitenmodulierten Signale von drei ersten Signalausgängen des Demultiplexers auf drei zweite Signalausgänge des Demultiplexers gelegt.In accordance with at least one embodiment of the method, at least one of the light-emitting diodes has at least two light-emitting diode chips. By way of example, all of the light-emitting diodes of the display device are so-called RGB light-emitting diodes, each of which comprises a red light, a blue light and a green light-emitting light-emitting diode chip. Per LED chip is doing a pulse width modulated signal to the LED passed. In this case, it is possible for a light-pulse-modulated signal to be fed simultaneously to each light-emitting diode chip of the light-emitting diode, so that the light-emitting diode chips of a light-emitting diode are operated simultaneously. In this case, the pulse width modulation circuit is suitable, for example, for simultaneously generating three different pulse width modulated signals. When switching from one light-emitting diode to the next light-emitting diode, the three pulse-width-modulated signals of three first signal outputs of the demultiplexer are then applied to three second signal outputs of the demultiplexer.

Alternativ ist es auch möglich, dass die Leuchtdiodenchips der Leuchtdiode sequentiell betrieben werden. Das heißt, der Demultiplexer schaltet nicht nur zwischen den einzelnen Leuchtdioden, sondern zwischen den einzelnen Leuchtdiodenchips durch. Auf diese Weise kann die Anzeigevorrichtung besonders energiesparend betrieben werden, da jeweils nur ein einziger Leuchtdiodenchip zu einer bestimmten Zeit bestromt wird.Alternatively, it is also possible for the light-emitting diode chips of the light-emitting diode to be operated sequentially. That is, the demultiplexer not only switches between the individual LEDs, but between the individual LED chips. In this way, the display device can be operated particularly energy-saving, since only a single LED chip is energized at a certain time.

Gemäß zumindest einer Ausführungsform des Verfahrens wird das pulsweitenmodulierte Signal vom Demultiplexer sequentiell zu den zumindest zwei Leuchtdioden geleitet. Das heißt, die Leuchtdioden der Anzeigevorrichtung werden nacheinander einzeln betrieben, keine der Leuchtdioden der Anzeigevorrichtung wird zur gleichen Zeit wie eine andere Leuchtdiode der Anzeigevorrichtung betrieben. Dabei ist es, wie gerade ausgeführt, auch möglich, dass die Leuchtdiodenchips der Leuchtdioden ebenfalls einzeln betrieben werden.In accordance with at least one embodiment of the method, the pulse-width-modulated signal is conducted by the demultiplexer sequentially to the at least two light-emitting diodes. That is, the LEDs of the display device are sequentially operated one by one, and none of the LEDs of the display device is operated at the same time as another LED of the display device. It is, as just stated, also possible that the LED chips of the LEDs are also operated individually.

Gemäß zumindest einer Ausführungsform des Verfahrens werden die Leuchtdiodenchips der zumindest zwei Leuchtdioden der Anzeigevorrichtung während der Einschaltzeit des pulsweitenmodulierten Signals jeweils mit der maximalen zulässigen Stromstärke betrieben. Aufgrund des sequentiellen Betreibens der Leuchtdioden und/oder der Leuchtdiodenchips der Anzeigevorrichtung scheint das von den Leuchtdioden erzeugte Licht insgesamt weniger hell, als wenn sämtliche Leuchtdioden gleichzeitig betrieben werden.In accordance with at least one embodiment of the method, the light-emitting diode chips of the at least two light-emitting diodes of the display device are each operated at the maximum permissible current intensity during the turn-on time of the pulse-width-modulated signal. Due to the sequential operation of the light-emitting diodes and / or the light-emitting diode chips of the display device, the light generated by the light-emitting diodes overall seems less bright than when all the light-emitting diodes are operated simultaneously.

Um diesen Helligkeitsunterschied auszugleichen, werden die Leuchtdioden während der kurzen Zeit, zu der sie betrieben werden, mit der maximal für sie zulässigen Stromstärke betrieben. Da das Betreiben der Leuchtdioden beziehungsweise der Leuchtdiodenchips stets nur kurz erfolgt, wird dadurch die Lebensdauer der Leuchtdioden kaum oder gar nicht negativ beeinflusst. Andererseits kann der Helligkeitsverlust aufgrund des sequentiellen Betreibens durch diese Maßnahme so stark ausgeglichen werden, dass für den Betrachter kaum ein Helligkeitsrückgang feststellbar ist.To compensate for this difference in brightness, the LEDs are operated during the short time they are operated at the maximum allowable for them current. Since the operation of the light-emitting diodes or the LED chips always takes place only briefly, thereby the life of the light-emitting diodes is hardly or not negatively influenced. On the other hand, the brightness loss due to the sequential operation by this measure can be compensated so strong that the viewer is hardly a decrease in brightness is detected.

Es wird darüber hinaus eine Beleuchtungsvorrichtung und eine Anzeigevorrichtung angegeben. Vorzugsweise handelt es sich dabei um eine hier beschriebene Anzeigevorrichtung, sodass sämtliche in Verbindung mit der Anzeigevorrichtung beschriebenen Merkmale auch in Verbindung mit der Beleuchtungsvorrichtung offenbart sind.There is also provided a lighting device and a display device. Preferably, this is a display device described here, so that all features described in connection with the display device are also disclosed in connection with the lighting device.

Die Beleuchtungsvorrichtung umfasst neben der Anzeigevorrichtung zumindest eine Lampe, die mit der Anzeigevorrichtung verbunden ist, wobei die Anzeigevorrichtung dazu vorgesehen ist, einen Betriebszustand der zumindest einen Lampe anzuzeigen. Dabei ist es möglich, dass die Anzeigevorrichtung beispielsweise folgende Eigenschaften des von der Lampe erzeugten Lichts anzeigt: Farbort, Farbtemperatur und/oder Helligkeit.The lighting device comprises, in addition to the display device, at least one lamp which is connected to the display device, wherein the display device is provided to indicate an operating state of the at least one lamp. It is possible the display device displays, for example, the following properties of the light generated by the lamp: color location, color temperature and / or brightness.

Im Folgenden wird die hier beschriebene Anzeigevorrichtung, das hier beschriebene Verfahren zum Betreiben einer Anzeigevorrichtung sowie die hier beschriebene Beleuchtungsvorrichtung anhand von Ausführungsbeispielen und den zugehörigen Figuren näher erläutert.In the following, the display device described here, the method described here for operating a display device as well as the illumination device described here will be explained in more detail on the basis of exemplary embodiments and the associated figures.

Gleiche, gleichartige oder gleich wirkende Elemente sind in den Figuren mit denselben Bezugszeichen versehen. Die Figuren und die Größenverhältnisse der in den Figuren dargestellten Elemente untereinander sind nicht als maßstäblich zu betrachten. Vielmehr können einzelne Elemente zur besseren Darstellbarkeit und/oder zum besseren Verständnis übertrieben groß dargestellt sein.The same, similar or equivalent elements are provided in the figures with the same reference numerals. The figures and the proportions of the elements shown in the figures with each other are not to be considered to scale. Rather, individual elements may be exaggerated in size for better representability and / or better understanding.

Die Figur 1 zeigt anhand einer schematischen Darstellung ein erstes Ausführungsbeispiel einer hier beschriebenen Anzeigevorrichtung. Die Anzeigevorrichtung umfasst eine Pulsweitenmodulationsschaltung 1. Die Pulsweitenmodulationsschaltung 1 weist einen Signalausgang 12 und einen Steuereingang 13 auf.The FIG. 1 shows a schematic representation of a first embodiment of a display device described here. The display device comprises a pulse width modulation circuit 1. The pulse width modulation circuit 1 has a signal output 12 and a control input 13.

Die Pulsweitenmodulationsschaltung 1 erzeugt ein pulsweitenmoduliertes Signal 10. Das pulsweitenmodulierte Signal 10 weist Einschaltzeiten t1 und Ausschaltzeiten t2 auf. Beispielsweise ist das pulsweitenmodulierte Signal 10 nach Art eines Rechteckimpulses ausgebildet.The pulse width modulation circuit 1 generates a pulse width modulated signal 10. The pulse width modulated signal 10 has switch-on times t1 and switch-off times t2. For example, the pulse width modulated signal 10 is formed in the manner of a rectangular pulse.

Die Anzeigevorrichtung umfasst weiter einen Demultiplexer 2. Der Demultiplexer 2 weist einen Signaleingang 21 auf. Ferner weist der Demultiplexer 2 eine Vielzahl von Signalausgängen 22 auf. Schließlich weist der Demultiplexer einen Steuereingang 23 auf.The display device further comprises a demultiplexer 2. The demultiplexer 2 has a signal input 21. Further the demultiplexer 2 has a multiplicity of signal outputs 22. Finally, the demultiplexer has a control input 23.

Die Pulsweitenmodulationsschaltung 1 und der Demultiplexer 2 sind über den Signalausgang 12 der Pulsweitenmodulationsschaltung 1 und den Signaleingang 21 des Demultiplexers 2 miteinander verbunden.The pulse width modulation circuit 1 and the demultiplexer 2 are connected to each other via the signal output 12 of the pulse width modulation circuit 1 and the signal input 21 of the demultiplexer 2.

Darüber hinaus sind die Pulsweitenmodulationsschaltung 1 und der Demultiplexer 2 über ihre Steuereingänge 13, 23 verbunden. Dadurch ist ein Regelkreis 4 zwischen Pulsweitenmodulationsschaltung 1 und Demultiplexer 2 erzeugt.In addition, the pulse width modulation circuit 1 and the demultiplexer 2 via their control inputs 13, 23 are connected. As a result, a control loop 4 is generated between pulse width modulation circuit 1 and demultiplexer 2.

Die Anzeigevorrichtung weist darüber hinaus eine Vielzahl von Leuchtdioden 3 auf. Bei den Leuchtdioden 3 handelt es sich vorliegend um RGB-Leuchtdioden, welche drei Leuchtdiodenchips 30 aufweisen, von denen einer im Betrieb rotes, einer blaues und einer grünes Licht erzeugt. Über die Signalausgänge 22 ist jeder der Leuchtdiodenchips 30 ein-eindeutig mit dem Demultiplexer 2 verbunden. Das heißt, die Zahl der Signalausgänge 22 entspricht beispielsweise dreimal der Zahl der Leuchtdioden 3 der Anzeigevorrichtung.The display device furthermore has a multiplicity of light-emitting diodes 3. In the present case, the light-emitting diodes 3 are RGB light-emitting diodes which have three light-emitting diode chips 30, one of which generates red, one blue and one green light during operation. Each of the light-emitting diode chips 30 is uniquely connected to the demultiplexer 2 via the signal outputs 22. That is, the number of signal outputs 22 corresponds, for example, three times the number of LEDs 3 of the display device.

Im Betrieb der Anzeigevorrichtung wird von der Pulsweitenmodulationsschaltung 1 ein pulsweitenmoduliertes Signal 10 erzeugt. Das pulsweitenmodulierte Signal 10 wird durch den Signaleingang 21 in den Demultiplexer 2 eingeprägt, der das pulsweitenmodulierte Signal 10 auf genau einen seiner Signalausgänge 22 schaltet, sodass ein geschaltetes pulsweitenmoduliertes Signal 20 zu einem der Leuchtdiodenchips 30 gesendet wird.During operation of the display device, a pulse width modulated signal 10 is generated by the pulse width modulation circuit 1. The pulse width modulated signal 10 is impressed by the signal input 21 in the demultiplexer 2, which switches the pulse width modulated signal 10 to exactly one of its signal outputs 22, so that a switched pulse width modulated signal 20 is sent to one of the LED chips 30.

Über den Regelkreis 4 sind der Demultiplexer 2 und die Pulsweitenmodulationsschaltung 1 miteinander synchronisiert, sodass das Umschalten von einem Leuchtdiodenchip 30 auf den nächsten Leuchtdiodenchip 30 jeweils während der Ausschaltzeit t2 erfolgt. Auf diese Weise ist ein unangenehmes Aufblitzen der Leuchtdiodenchips 30 beim Umschaltvorgang verhindert. Die Leuchtdiodenchips 30 werden nacheinander, das heißt sequentiell, in schneller Abfolge jeweils mit einem pulsweitenmodulierten Signal beaufschlagt, sodass das Schalten dem Betrachter aufgrund der Trägheit des menschlichen Auges nicht auffällt.About the control circuit 4, the demultiplexer 2 and the pulse width modulation circuit 1 are synchronized with each other, so that the switching from a light-emitting diode chip 30 to the next light-emitting diode chip 30 takes place during the turn-off time t2. In this way, an unpleasant flash of the LED chips 30 during the switching process is prevented. The LED chips 30 are successively, that is, sequentially applied in rapid succession each with a pulse width modulated signal, so that the switching of the observer due to the inertia of the human eye is not noticeable.

Im Unterschied zum in Verbindung mit der Figur 1 beschriebenen Ausführungsbeispiel ist es auch möglich, dass die Pulsweitenmodulationsschaltung 1 mehrere pulsweitenmodulierte Signale 10 erzeugt, wobei die Zahl der Signale 10 der Zahl der Leuchtdiodenchip 30 pro Leuchtdiode entspricht. Auf diese Weise können die Leuchtdiodenchips 30 einer einzigen Leuchtdiode jeweils gleichzeitig betrieben werden, sodass ein sequentielles Umschalten nicht zwischen einzelnen Leuchtdiodenchips, sondern zwischen einzelnen Leuchtdioden erfolgt.Unlike in conjunction with the FIG. 1 described embodiment, it is also possible that the pulse width modulation circuit 1 generates a plurality of pulse width modulated signals 10, wherein the number of signals 10 corresponds to the number of light-emitting diode chip 30 per LED. In this way, the light-emitting diode chips 30 of a single light-emitting diode can each be operated simultaneously, so that a sequential switching does not take place between individual light-emitting diode chips but between individual light-emitting diodes.

In Verbindung mit der Figur 2 ist ein Ausführungsbeispiel einer hier beschriebenen Beleuchtungsvorrichtung näher erläutert.In conjunction with the FIG. 2 an embodiment of a lighting device described here is explained in more detail.

Die Figur 2 zeigt eine Anzeigevorrichtung 100, wie sie beispielsweise in Verbindung mit der Figur 1 näher erläutert ist. Die Anzeigevorrichtung 100 umfasst zwölf einzelne Leuchtdioden 3, die jeweils hinter einem Sichtfenster 140 angeordnet sind. Die Anzeigevorrichtung umfasst ein Bedienfeld 31, auf dem Bedienelemente 120 angeordnet sind, die mittels Berührung des Bedienfeldes 31 aktiviert werden können. Beispielsweise handelt es sich bei dem Bedienfeld 31 um eine Glasoberfläche, hinter der kapazitive Schalter im Bereich der Bedienelemente 120 angeordnet sind. Eine Bedienanordnung mit einem solchen Bedienfeld ist zum Beispiel in den Druckschriften DE 10 2005 059 067 A1 und DE 10 2007 017 335 A1 näher erläutert.The FIG. 2 shows a display device 100, as for example in connection with the FIG. 1 is explained in more detail. The display device 100 comprises twelve individual light-emitting diodes 3, which are each arranged behind a viewing window 140. The display device comprises a control panel 31, on which operating elements 120 are arranged, which can be activated by touching the control panel 31. By way of example, the control panel 31 is a glass surface, behind which capacitive switches are arranged in the region of the control elements 120. An operating arrangement with such a control panel is for example in the publications DE 10 2005 059 067 A1 and DE 10 2007 017 335 A1 explained in more detail.

Die Anzeigevorrichtung ist mit einer oder mehrerer Lampen 200 verbunden, die jeweils eine Vielzahl von Leuchtdioden 201 aufweisen können. Mittels der Leuchtdioden 3 der Anzeigevorrichtung kann der Betriebszustand der Lampen 200 angezeigt werden. Beispielsweise kann jedem Bedienelement genau eine Lampe zugeordnet sein, deren Betriebszustand durch die Leuchtdiode 3 angezeigt wird.The display device is connected to one or more lamps 200, which may each have a plurality of light-emitting diodes 201. By means of the LEDs 3 of the display device, the operating state of the lamps 200 can be displayed. For example, each control element can be associated with exactly one lamp whose operating state is indicated by the light-emitting diode 3.

Diese Patentanmeldung beansprucht die Priorität der deutschen Patentanmeldung 102009007504.6 .This patent application claims the priority of the German patent application 102009007504.6 ,

Claims (7)

  1. Method for operating an indicator apparatus which has at least two light-emitting diodes (3), having the following steps:
    - a pulse-width-modulated signal (10), which has at least one switched-on time (t1) and at least one switched-off time (t2), is produced by means of a pulse width modulation circuit (1),
    - the pulse-width-modulated signal (10) is routed to a demultiplexer (2),
    - pulse width modulation circuit (1) and demultiplexer (2) are synchronized,
    wherein
    - the demultiplexer (2) has at least one signal input (21) and at least two signal outputs (22), wherein the signal input (21) is connected to the pulse width modulation circuit (1) and the demultiplexer (2) has more signal outputs (22) than signal inputs (21), and
    - the light-emitting diodes (3) are each connected to a signal output (22) of the demultiplexer, characterized in that
    - pulse width modulation circuit (1) and demultiplexer (2) are synchronized such that the demultiplexer (2) is switched from one of the light-emitting diodes to the next light-emitting diode during one of the switched-off times (t2) of the pulse-width-modulated signal (10), and
    - the demultiplexer (2) supplies the light-emitting diodes (3) with operating current, wherein the demultiplexer switches the pulse-width-modulated signal (10) from the pulse width modulation circuit (1) to one of the signal outputs (22) which is connected to one of the light-emitting diodes (3).
  2. Method according to the preceding claim,
    wherein at least one of the light-emitting diodes (3) has at least two light-emitting-diode chips (30) and for each light-emitting-diode chip (30) a pulse-width-modulated signal (10) is routed to the light-emitting diode (3).
  3. Method according to one of the preceding claims,
    wherein the pulse-width-modulated signal (10) is routed from the demultiplexer (2) sequentially to the at least two light-emitting diodes (3).
  4. Method according to one of the preceding claims,
    wherein the light-emitting-diode chips (30) of the at least two light-emitting diodes (3) are each operated at the maximum permissible current level in the switched-on time (t1) of the pulse-width-modulated signal (10).
  5. Method according to one of the preceding claims,
    wherein the demultiplexer (2) has a control input (23) which is connected to a control input (13) of the pulse width modulation circuit (1).
  6. Method according to one of the preceding claims,
    wherein each light-emitting diode (3) comprises at least two light-emitting-diode chips (30), wherein each light-emitting-diode chip (30) is bijectively connected to a signal output (22) of the demultiplexer (2).
  7. Method according to one of the preceding claims,
    wherein the indicator apparatus comprises at least eight light-emitting diodes (3), wherein the power consumption of the indicator apparatus is no more than 0.5 watt.
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Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983553A (en) * 1975-05-12 1976-09-28 General Motors Corporation Appliance remote touch-control panel with sound system
CA2063744C (en) * 1991-04-01 2002-10-08 Paul M. Urbanus Digital micromirror device architecture and timing for use in a pulse-width modulated display system
US5351685A (en) * 1991-08-05 1994-10-04 Nellcor Incorporated Condensed oximeter system with noise reduction software
AU667199B2 (en) * 1991-11-08 1996-03-14 Physiometrix, Inc. EEG headpiece with disposable electrodes and apparatus and system and method for use therewith
EP0844464B1 (en) * 1996-11-21 2003-05-07 Omron Corporation Method of and apparatus for displaying measured variables
US6188181B1 (en) * 1998-08-25 2001-02-13 Lutron Electronics Co., Inc. Lighting control system for different load types
DE29816331U1 (en) * 1998-09-15 1998-12-10 Dambach Werke Gmbh LED matrix display device
US6217188B1 (en) * 1999-03-04 2001-04-17 Ani-Motion, Inc. Color changeable fiber-optic illuminated display
DE10140331C2 (en) * 2001-08-16 2003-11-06 Siemens Ag Traffic control light signals and method for monitoring the function of such a sign
DE102004003698B4 (en) * 2004-01-24 2005-11-24 Preh Gmbh Circuit arrangement for controlling bulbs
US20050269580A1 (en) * 2004-06-04 2005-12-08 D Angelo Kevin P Single wire serial protocol for RGB LED drivers
US20060261794A1 (en) * 2005-05-17 2006-11-23 May Marcus W Method & apparatus for DC-DC regulation with improved transient function
KR100661661B1 (en) * 2005-07-01 2006-12-26 삼성전자주식회사 Display apparatus and control method thereof
DE102005059067B4 (en) 2005-12-08 2014-07-10 FELA GmbH Capacitive keyboard device
KR20080073464A (en) * 2007-02-06 2008-08-11 삼성전자주식회사 Apparatus for driving of light source and display device having the same and method of the driving
DE102007017335C5 (en) 2007-04-11 2017-04-27 FELA GmbH Lighting unit with a transparent support plate and light emitting diode
US20090033612A1 (en) * 2007-07-31 2009-02-05 Roberts John K Correction of temperature induced color drift in solid state lighting displays
DE102007040111B3 (en) 2007-08-24 2008-10-23 Siemens Ag Method for starting up a lighting system

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