EP3981224A1 - Verfahren zum betreiben eines leuchtdioden-moduls und leuchtdioden-modul - Google Patents
Verfahren zum betreiben eines leuchtdioden-moduls und leuchtdioden-modulInfo
- Publication number
- EP3981224A1 EP3981224A1 EP20729060.2A EP20729060A EP3981224A1 EP 3981224 A1 EP3981224 A1 EP 3981224A1 EP 20729060 A EP20729060 A EP 20729060A EP 3981224 A1 EP3981224 A1 EP 3981224A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- emitting diodes
- emitting diode
- gamut
- driver device
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/33—Pulse-amplitude modulation [PAM]
-
- 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
- H05B45/345—Current stabilisation; Maintaining constant current
Definitions
- the invention relates to a method for operating a light-emitting diode module and a
- three light-emitting diodes are usually combined with one another.
- the light emitted by a red, a green and a blue light-emitting diode spans a gamut. All color locations within the gamut can be reached and associated color impressions generated by means of additive color mixing.
- the focal wavelengths of the light-emitting diodes vary, the gamut provided by the light-emitting diodes also changes.
- DE 10 2008 025 865 A1 discloses a method for operating a light-emitting diode module consisting of a number of differently colored light-emitting diodes which can be controlled by a control circuit via control signals, the control circuit having at least one EPROM from which the control signals can be called up, where in
- EPROM the parameters of a color space for the light control of the light emitting diode module are stored, and that the data stored in the EPROM are read out by the electronics, all necessary color components of the individual light emitting diodes are calculated and used to calculate the necessary color components.
- the invention is based on the object of creating a method for operating a light-emitting diode module and a light-emitting diode module, in which even when fluctuating
- Emission properties of the light emitting diodes can be provided a predetermined gamut.
- the object is achieved by a method with the features of claim 1 and a light-emitting diode module with the features of claim 6.
- Advantageous embodiments of the invention emerge from the subclaims.
- a method for operating a light-emitting diode module comprising at least three different-colored light-emitting diodes which together span a gamut of adjustable color locations and which are controlled by means of a driver device via control signals, with current intensities with which the at least three different colored light-emitting diodes are operated in each case, are adapted for setting predetermined corner points of the gamut, so that a predetermined gamut is provided.
- a light-emitting diode module comprising at least three
- driver device is designed to control the at least three light-emitting diodes via control signals, with current intensities with which the at least three different-colored light-emitting diodes are operated for setting predetermined corner points of the gamut are adjusted so that a
- predetermined gamut can be provided.
- the method and the light-emitting diode module enable fluctuations in the
- Compensate for the emission properties of the light emitting diodes This is done by changing or adapting a current intensity with which a light-emitting diode is operated. By changing the current strength, the emitted spectrum changes and in particular one
- Center of gravity wavelength which can also be referred to as the dominant wavelength. If the current intensity is tripled, for example, from the usual 20 mA to 60 mA, a centroid wavelength changes by approx. 5 nm. This effect is used to adapt the gamut spanned by the at least three light-emitting diodes. For each of the at least three light-emitting diodes, the current intensity is selected or adapted individually, so that a focal wavelength that is necessary in each case to simulate a predetermined gamut is set.
- three light-emitting diodes are used, one red light-emitting diode
- a green light-emitting diode (wavelength range from 500-560 nm) and a blue light-emitting diode (wavelength range from 430-480 nm) can be combined to form a light-emitting diode module.
- a gamut describes an area in the color space that can be reproduced with the light-emitting diode module through additive color mixing.
- the range can be illustrated, for example, using the CIE chromaticity diagram (CIE1931).
- Center of gravity wavelength, from the current strength can be determined empirically, for example.
- the dependency can also be calculated by means of a simulation.
- the light-emitting diodes are controlled in particular by means of pulse width modulation.
- the pulse width modulated pulses are provided by means of the driver device.
- a focus wavelength of the respective light-emitting diode is established or adapted via a current intensity, that is to say an amplitude, of the pulses.
- An intensity of the emitted light is controlled by means of the driver device via the pulse width of the pulses, so that a desired color location within the gamut is achieved through additive color mixing.
- the driver device can be designed as a combination of hardware and software, for example as program code that is executed on a microcontroller or microprocessor.
- Series resistance can be adjusted. This is a particularly simple implementation of the method and the light-emitting diode module in terms of complexity, since only the series resistor has to be adapted, but the rest of the control can be retained. This allows effort and costs to be kept low. Depending on a
- a current intensity is calculated for the target wavelength for the centroid wavelength is necessary to achieve the target wavelength. Then, depending on an available operating voltage, a suitable series resistor is selected for the respective light-emitting diode and installed in the light-emitting diode module.
- the current intensities are adapted by means of the driver device, the driver device adapting the control signals accordingly for this purpose.
- the driver device matches the amplitude of the
- pulse width modulated pulses This allows flexible adaptation. A renewed adjustment at a later point in time is also possible without great effort, since only associated parameters have to be changed in the driver device.
- LED module takes place, but then no further or renewed adjustment takes place. However, it can also be provided that the adaptation takes place during ongoing operation of the light-emitting diode module.
- a change in intensity caused by the adaptation of the current intensities is compensated for by adapting the control signals.
- an overall intensity can be kept constant.
- a pulse width of the pulse width modulated pulses is adapted accordingly.
- a pulse width is reduced with an increasing intensity, but increased with a decreasing intensity.
- the adaptation of the pulse width takes place in such a way that an effective current strength is kept constant when a light-emitting diode is driven.
- At least one emission property is recorded and / or obtained for each of the at least three light-emitting diodes, a value of the adjusted current intensity being determined in each case on the basis of the recorded and / or obtained at least one emission property.
- the light-emitting diode module can be set to a predetermined gamut before use.
- the LED module can be installed at the final place of use.
- the driver device has a memory in which the emission properties are stored before the light-emitting diode module is arranged at or in a final place of use. The driver device calculates on the basis of the stored
- Emission properties the adjusted current strengths and stored them in the memory.
- the driver device then makes the respective calculated current levels available.
- FIG. 1 shows a schematic representation of an embodiment of the light-emitting diode module
- FIG. 2 shows a schematic illustration of an embodiment of the method for operating a light-emitting diode module.
- Fig. 1 a schematic representation of an embodiment of the light-emitting diode module 1 is shown.
- the light-emitting diode module 1 comprises three light-emitting diodes 2, 3, 4 of different colors and a driver device 5.
- the different colored light emitting diodes 2, 3, 4 each have focal wavelengths that provide red light, green light and blue light.
- the light-emitting diode 2 emits in the red wavelength range, that is to say an associated focal point wavelength is in the range from 580-650 nm;
- the light-emitting diode 3 emits in the green wavelength range, that is to say an associated focal wavelength is in the range of 500-560 nm;
- the light-emitting diode 4 emits in the blue wavelength range, that is to say the focal wavelength is in the range from 430-480 nm.
- the driver device 5 is designed in such a way that the light-emitting diodes 2, 3, 4 are controlled via control signals 6.
- the control signals 6 include pulse-width-modulated pulses that are defined by an amplitude and a pulse width. It is provided that the current intensities with which the light-emitting diodes 2, 3, 4 are operated in each case are adapted to set predetermined corner points of the gamut, so that a predetermined gamut is provided. For example, it can be provided that a key wavelength of the light-emitting diode 2 has to be shifted by 3 nm in order to be able to provide the predetermined gamut. Accordingly, a current strength or an amplitude of the pulse-width-modulated pulses used to drive this light-emitting diode 2 is increased to a sufficient extent. It can further be provided in the example that the
- Main wavelength of the light emitting diode 3 must be reduced by 2 nm.
- a current strength or an amplitude of the pulse-width-modulated pulses used to drive this light-emitting diode 3 is sufficiently reduced, etc.
- the corner points of the spanned gamut also shift, so that the gamut changes accordingly and thereby at least approximates a predetermined gamut can be.
- a predefined or desired color location within the gamut is set by setting a pulse width of the pulses used in each case to drive the light-emitting diodes 2, 3, 4. The given resp.
- the driver device 5 is informed of the desired color location, for example via a color location signal 8. In this way, an intensity emitted in each case by the light-emitting diodes 2, 3, 4 can be set.
- the intensity required in each case is calculated by means of the driver device 5 and determined via the pulse widths of the pulse-width-modulated control signals 6.
- the desired color location is achieved via an additive color mixture of the electromagnetic radiation emitted in each case by the light-emitting diodes 2, 3, 4.
- the respective series resistors 7 are selected and arranged in such a way that, starting from a supply voltage or signal voltage, the respectively specified current strength or the respectively specified amplitude of the pulses is achieved.
- the series resistors 7 are connected in series in the respective signal path between the driver device 5 and the light-emitting diodes 2, 3, 4.
- the current intensities are (actively) adapted by means of the driver device 5, the driver device 5 for this purpose correspondingly adapting the control signals 6, in particular an amplitude of the pulse-width-modulated pulses. It can furthermore be provided that a change in intensity caused by the adaptation of the current strengths is compensated for by adapting the control signals. In particular, a pulse width of the pulse width modulated pulses is then adapted for this purpose. It can be provided, for example, that the pulse widths of the
- Driver device are each adapted so that an effective current strength remains the same.
- At least one emission property 9 is detected and / or obtained for each of the three light-emitting diodes 2, 3, 4, a value of the adapted
- Amperage is determined in each case on the basis of the detected and / or obtained at least one emission property 9.
- the driver device 5 can receive, in particular receive, a centroid wavelength of the respective light-emitting diodes 2, 3, 4 as an emission property 9.
- the centroid wavelengths are measured, for example, by a manufacturer of the light-emitting diodes 2, 3, 4 and made available in the form of a data sheet.
- the driver device 5 determines the adapted current intensities, for example by comparing with wavelengths of corner points of the predetermined gamut.
- Fig. 2 is a schematic representation of an embodiment of the method for
- a predetermined gamut or its three corner points is provided. This is done by receiving wavelengths at the three corner points of the gamut, for example by means of the driver device.
- emission properties of three light-emitting diodes are obtained.
- the three light-emitting diodes cover the three colors red, green and blue, which are intended to span the gamut.
- the emission properties obtained are taken, for example, from technical data sheets of a manufacturer of the light-emitting diodes and in particular include a respective focal wavelength or dominant wavelength of one of the
- Light emitting diodes emitted electromagnetic radiation.
- a method step 102 differences between the wavelengths of the corner points of the predetermined gamut and the respective corresponding centroid wavelengths of the light-emitting diodes are determined.
- the respective current strengths or amplitudes for driving the light-emitting diodes are determined on the basis of the determined differences.
- the determined current intensities are provided in an alternative by selecting and connecting series resistors.
- the Driver device stored.
- the driver device then controls the respective light emitting diodes with current intensities or amplitudes according to the stored values.
- pulse widths of control signals for driving the individual light-emitting diodes are then calculated, the pulse widths being selected in such a way that a predetermined or desired color location is achieved within the spanned gamut.
- Control signals is compensated.
- the advantage of the light-emitting diode module and the method is that a uniform color impression can be produced even if the emission properties of the light-emitting diodes used fluctuate due to manufacturing tolerances.
- the same or the same color impressions can always be produced regardless of the specific batches of light emitting diodes used.
- uniform color impressions can be produced across all of the light-emitting diode modules used. Since the
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019208347.1A DE102019208347B4 (de) | 2019-06-07 | 2019-06-07 | Verfahren zum Betreiben eines Leuchtdioden-Moduls und Leuchtdioden-Modul |
| PCT/EP2020/064807 WO2020245023A1 (de) | 2019-06-07 | 2020-05-28 | Verfahren zum betreiben eines leuchtdioden-moduls und leuchtdioden-modul |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3981224A1 true EP3981224A1 (de) | 2022-04-13 |
| EP3981224B1 EP3981224B1 (de) | 2026-04-29 |
Family
ID=70918452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20729060.2A Active EP3981224B1 (de) | 2019-06-07 | 2020-05-28 | Verfahren zum betreiben eines leuchtdioden-moduls und leuchtdioden-modul |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3981224B1 (de) |
| CN (1) | CN114097306A (de) |
| DE (1) | DE102019208347B4 (de) |
| WO (1) | WO2020245023A1 (de) |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3221422B2 (ja) * | 1998-12-28 | 2001-10-22 | 日本電気株式会社 | 波長分散測定装置 |
| JP2001272938A (ja) * | 2000-03-28 | 2001-10-05 | Sharp Corp | 色調調整回路およびその回路を備えたバックライトモジュールおよび発光ダイオード表示装置 |
| US7354172B2 (en) * | 2004-03-15 | 2008-04-08 | Philips Solid-State Lighting Solutions, Inc. | Methods and apparatus for controlled lighting based on a reference gamut |
| JP4463024B2 (ja) * | 2004-06-21 | 2010-05-12 | シャープ株式会社 | 発光装置 |
| US7088059B2 (en) * | 2004-07-21 | 2006-08-08 | Boca Flasher | Modulated control circuit and method for current-limited dimming and color mixing of display and illumination systems |
| US7317403B2 (en) * | 2005-08-26 | 2008-01-08 | Philips Lumileds Lighting Company, Llc | LED light source for backlighting with integrated electronics |
| US7696964B2 (en) * | 2006-06-09 | 2010-04-13 | Philips Lumileds Lighting Company, Llc | LED backlight for LCD with color uniformity recalibration over lifetime |
| DE102008025865A1 (de) * | 2008-05-29 | 2009-12-03 | Lumitech Produktion Und Entwicklung Gmbh | LED-Modul mit integrierten elektronischen Bauteilen für die Farbort- und Intensitätssteuerung |
| EP2273851A3 (de) * | 2009-06-24 | 2011-05-11 | Nxp B.V. | System und Verfahren zur Steuerung eines LED-Clusters |
| CN102542996B (zh) * | 2010-12-31 | 2014-09-03 | 深圳市长运通光电技术有限公司 | 一种led波长矫正电路 |
| DE102011014440B4 (de) | 2011-03-18 | 2025-07-31 | Mercedes-Benz Group AG | Verfahren zum Einstellen einer Leuchtfarbe eines Leuchtmittels, System mit einer Leuchtvorrichtung sowie Kraftfahrzeug |
| EP2575411B1 (de) * | 2011-09-27 | 2018-07-25 | Infineon Technologies AG | LED-Treiber mit Ausgleich thermisch induzierter Farbabweichung |
| CN102811538A (zh) * | 2012-07-24 | 2012-12-05 | 上海亚明照明有限公司 | Led模组的驱动电路 |
| DE102013201915A1 (de) | 2012-10-31 | 2014-05-15 | Tridonic Jennersdorf Gmbh | Verfahren und Anordnung zur Steuerung von LEDs |
| CN103025030B (zh) * | 2012-12-27 | 2016-03-23 | 余姚市吉佳电器有限公司 | Led隧道照明调光系统 |
| GB2522862A (en) * | 2014-02-05 | 2015-08-12 | Innovation Led Ltd | Controlling apparatus and method for controlling a lighting apparatus having at least two light sources |
| EP3032918B1 (de) * | 2014-12-11 | 2022-04-20 | Lumitech Patentverwertung GmbH | Verfahren zum Betreiben einer zum Emittieren von in seiner Helligkeit und/oder seinem Farbort einstellbarem Licht eingerichteten Anordnung |
| KR102275027B1 (ko) * | 2015-03-06 | 2021-07-12 | 삼성디스플레이 주식회사 | 표시 장치 및 이의 구동 방법 |
| US10624187B2 (en) * | 2016-02-22 | 2020-04-14 | Energizer Brands, Llc | Light emitting diode driver regulated to consume constant battery current input |
| CN107231720A (zh) * | 2016-03-26 | 2017-10-03 | 上海冠瑞医疗设备股份有限公司 | 一种基于全彩led 的控制方法 |
| DE102017125405B4 (de) * | 2017-10-30 | 2021-03-18 | Melexis Technologies Nv | Verfahren und Vorrichtung zum Kalibrieren und Betreiben einer RGB-LED-Beleuchtung |
-
2019
- 2019-06-07 DE DE102019208347.1A patent/DE102019208347B4/de active Active
-
2020
- 2020-05-28 WO PCT/EP2020/064807 patent/WO2020245023A1/de not_active Ceased
- 2020-05-28 CN CN202080049216.0A patent/CN114097306A/zh active Pending
- 2020-05-28 EP EP20729060.2A patent/EP3981224B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020245023A1 (de) | 2020-12-10 |
| DE102019208347B4 (de) | 2025-01-30 |
| DE102019208347A1 (de) | 2020-12-10 |
| CN114097306A (zh) | 2022-02-25 |
| EP3981224B1 (de) | 2026-04-29 |
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