EP1893003A1 - Dispositif de commande pour une lampe comportant des LEDs émettant une lumière d'au moins quatre couleurs - Google Patents

Dispositif de commande pour une lampe comportant des LEDs émettant une lumière d'au moins quatre couleurs Download PDF

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Publication number
EP1893003A1
EP1893003A1 EP06017472A EP06017472A EP1893003A1 EP 1893003 A1 EP1893003 A1 EP 1893003A1 EP 06017472 A EP06017472 A EP 06017472A EP 06017472 A EP06017472 A EP 06017472A EP 1893003 A1 EP1893003 A1 EP 1893003A1
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EP
European Patent Office
Prior art keywords
input signal
leds
signal
led
reference values
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06017472A
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German (de)
English (en)
Inventor
Christian Möllering
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP06017472A priority Critical patent/EP1893003A1/fr
Publication of EP1893003A1 publication Critical patent/EP1893003A1/fr
Withdrawn legal-status Critical Current

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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]
    • H05B45/20—Controlling the colour of the light

Definitions

  • the invention relates to a device for generating light according to an input signal having a plurality of differently colored LEDs, and to a control unit connected to the LEDs for controlling the LEDs.
  • the invention also relates to a method for generating light by driving a plurality of differently colored LEDs in accordance with an input signal.
  • luminaires for generating variable color light are known according to an RGB control signal having red, green and blue LEDs.
  • the radiation emitted by the colored LEDs in their wavelength ranges does not correspond to those which are theoretically necessary in order to be able to fully image the actual RGB color space. Therefore, the light generated by the luminaires deviates in its color space from the RGB color space of the RGB control signal. This leads to a poor color fidelity and color rendering quality.
  • the DE 10 2005 001 685 A1 a system and method for generating white light using four LEDs, namely a red, a green, a blue and a white LED described.
  • the system is exclusively designed to produce a constant white light over time. Therefore, it has a spectral feedback control system configured to detect light emitted from the light source and at the same time to adjust the driving of the LEDs according to the detection. In this way, it is ensured that the individual LEDs each emit the radiation components, which add up in the sum to a constant white light.
  • the object of the present invention is to provide a device and a method which make it possible to generate light with the aid of LEDs, which in its color space, i. in the included wavelength ranges, the color space of an input signal largely corresponds.
  • This object is achieved in a device of the type mentioned above in that the device has at least four differently colored LEDs and that the control means transforms the input signal into a control signal having a channel for each LED.
  • the basic idea of the invention is therefore to provide at least four different LEDs which are each driven separately via a respective channel of the control signal.
  • the control unit transforms the input signal into the control signal, which has a number of control channels corresponding to the number of different LEDs.
  • the advantage of the device according to the invention is that it generates colored light in good agreement with the color space of an input signal. It is thus capable of producing light of different wavelength ranges according to the input signal with a high color fidelity.
  • the input signal is an RGB signal, in particular a standard RGB signal such as DMX, DALI.
  • a standard RGB signal such as DMX, DALI.
  • the device may also include a red, a green, a blue and a white LED.
  • a red, a green, a blue and a white LED The combination of these four different LEDs makes it possible to produce light with a wide variety of colors, i. Wavelength ranges to produce.
  • a phosphor conversion white light emitting diode LED is particularly suitable because it emits intense white light.
  • control unit may additionally comprise a memory and a processor.
  • a matrix of reference values which were determined with the aid of a calibration method are stored in the memory.
  • the processor is designed such that it can transform the input signal into the control signal either directly or by interpolation with the aid of the reference values which it reads from the memory. It is advantageous that a rapid transformation of the input signal into the control signal is possible.
  • the object is also achieved by a method of the type mentioned, in which at least four differently colored LEDs are used, and the input signal is transformed into a control signal having one channel for each LED.
  • an RGB signal can be used as the input signal, and it is likewise possible that the input signal is transformed into a control signal which has four channels with which a red, a green, a blue and a white LED are then driven.
  • a white LED a phosphor conversion white emitting diode (LED) can be used.
  • the input signal can be determined with the aid of a Matrix of reference values, which are determined by calibration and / or transformed by interpolation, starting from the reference values in the control signal.
  • FIG. 1 shows a device according to the invention for generating light.
  • the device has a plurality of LEDs 1 and a control unit 2. Specifically, a red 3, a green 4, a blue 5 and a white LED 6 are provided here, which are arranged immediately adjacent as a functional unit.
  • the white LED 6 is a phosphor conversion white light emitting diode.
  • the control unit 2 comprises a memory 7 which contains a matrix of reference values and a processor 8 which can access the reference values in the memory 7.
  • the processor 8 is designed to generate a control signal from the reference values, optionally interpolating reference values.
  • control unit 2 has an input 9, which comprises three channels 11, which together form an input signal.
  • control unit 2 has an output 10 which comprises four channels 11, which together form a control signal. In each case a channel 11 of the output 10 is connected to one of the LEDs 1.
  • the input signal is applied to the input 9 of the control unit 2.
  • This may be, for example, a standard RGB signal such as DMX.
  • the processor 8 of the control unit 2 determines directly or by interpolation with the aid of reference values which it has read from the memory 7, the control signal, which is then applied to the output 10. For this purpose, the processor 8 queries in the memory 7 whether reference values corresponding to the input signal are stored. If this is the case, he generates the output signal based on these values. Otherwise, the processor 8 reads from the memory 7 reference values which are in the range of the input signal and generates the output signal by interpolation.
  • a channel 11 of the control signal controls one of the LEDs 1.
  • the LEDs 1 respectively emit radiation in accordance with the control signal, and the sum of the radiation emitted by them gives the light to be generated.
  • the reference values stored in the memory 7 are determined and stored in a test phase of the luminaire. For this purpose trajectories in the source space are traversed by means of a calibrated reference camera and connected to interpolation points in the target area. The density of the interpolation points depends on the deviation from the theoretical standard value.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP06017472A 2006-08-22 2006-08-22 Dispositif de commande pour une lampe comportant des LEDs émettant une lumière d'au moins quatre couleurs Withdrawn EP1893003A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06017472A EP1893003A1 (fr) 2006-08-22 2006-08-22 Dispositif de commande pour une lampe comportant des LEDs émettant une lumière d'au moins quatre couleurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06017472A EP1893003A1 (fr) 2006-08-22 2006-08-22 Dispositif de commande pour une lampe comportant des LEDs émettant une lumière d'au moins quatre couleurs

Publications (1)

Publication Number Publication Date
EP1893003A1 true EP1893003A1 (fr) 2008-02-27

Family

ID=37533317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06017472A Withdrawn EP1893003A1 (fr) 2006-08-22 2006-08-22 Dispositif de commande pour une lampe comportant des LEDs émettant une lumière d'au moins quatre couleurs

Country Status (1)

Country Link
EP (1) EP1893003A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239449A1 (de) * 2002-02-06 2003-08-07 Ulrich Kuipers Verfahren und Vorrichtung zur Realisierung von LED-Leuchten mit Farb- und/oder Helligkeitseinstellung und dem dazugehörigen Bedienelement
DE102005001685A1 (de) * 2004-03-11 2005-09-29 Agilent Technologies, Inc. (n.d.Ges.d.Staates Delaware), Palo Alto System und Verfahren zum Erzeugen weißen Lichts unter Verwendung von LEDs
EP1662583A1 (fr) * 2003-07-28 2006-05-31 Nichia Corporation Appareil electroluminescent, affichage a diodes electroluminescentes, appareil electroluminescent a diodes electroluminescentes et procede de commande d'un appareil electroluminescent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239449A1 (de) * 2002-02-06 2003-08-07 Ulrich Kuipers Verfahren und Vorrichtung zur Realisierung von LED-Leuchten mit Farb- und/oder Helligkeitseinstellung und dem dazugehörigen Bedienelement
EP1662583A1 (fr) * 2003-07-28 2006-05-31 Nichia Corporation Appareil electroluminescent, affichage a diodes electroluminescentes, appareil electroluminescent a diodes electroluminescentes et procede de commande d'un appareil electroluminescent
DE102005001685A1 (de) * 2004-03-11 2005-09-29 Agilent Technologies, Inc. (n.d.Ges.d.Staates Delaware), Palo Alto System und Verfahren zum Erzeugen weißen Lichts unter Verwendung von LEDs

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