EP2433472B1 - Procédé de réglage d'un point de couleur - Google Patents

Procédé de réglage d'un point de couleur Download PDF

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Publication number
EP2433472B1
EP2433472B1 EP10720393.7A EP10720393A EP2433472B1 EP 2433472 B1 EP2433472 B1 EP 2433472B1 EP 10720393 A EP10720393 A EP 10720393A EP 2433472 B1 EP2433472 B1 EP 2433472B1
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EP
European Patent Office
Prior art keywords
light
emitting diode
color
phosphor
led
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Active
Application number
EP10720393.7A
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German (de)
English (en)
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EP2433472A1 (fr
Inventor
Ralph Bertram
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Osram GmbH
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Osram 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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • 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 method for adjusting a color location.
  • WO 2009/039132 A1 discloses a system for controlling the intensity and spectrum of a semiconductor lighting system.
  • a light with a color locus on or near the Planckian curve preferably with a color temperature between 2000K and 4000K or at a standard color location according to IEC 60081, can be efficiently generated.
  • LEDs light-emitting diodes
  • One goal is to achieve a high color rendering or a nearly constant color fidelity in a wide range.
  • phosphor converted light emitting diodes can be used in a certain range in the Cx-Cy color diagram above the Planckian curve.
  • red LEDs can also be used. This achieves a high color rendering index Ra (8)> 90.
  • Luminaires according to the prior art have the problem that the brightness and color locations of the LEDs used to migrate with a change in temperature. Also, the individual LEDs are subject to aging, so that changes over time the mediated by the lamp color impression. It is customary for the luminaire to have a temperature range of 20 ° C. (for example when the luminaire is switched on) up to 100 ° C. in a thermally stabilized state.
  • the color locus migrates with increasing temperature (typically by + 0.07 nm / K) due to the shift of the dominant wavelength of the red LED. This results in a shift of the sum color location by about three MacAdams Threshold Units (SWE) from the original color location. In that regard, with changing temperature and the change of the color location of a user is perceptible.
  • increasing temperature typically by + 0.07 nm / K
  • SWE MacAdams Threshold Units
  • the object of the invention is to avoid the above-mentioned disadvantages and in particular to provide an efficient way to keep the color location of a lamp (largely) constant.
  • the light-emitting diode may in each case be any semiconductor light-emitting element.
  • a number of the employed LED colors correspond to a number of lighting parameters to be controlled and / or controlled, e.g. brightness, CIE coordinates (Cx, Cy) or tristimulus coordinates (X, Y, Z) minus one.
  • a regulation or control is not only about the brightness of the individual colors.
  • the control or regulation is thus carried out via the mentioned combination of current and pulse width modulation of the individual types of light-emitting diodes.
  • setting the pulse width modulation means in particular that the duty cycle (active / inactive) per time interval for controlling the respective LED is adjustable.
  • a 50% pulse width modulation means that the LED is 50% active and 50% inactive within a given time interval.
  • the phosphor-converted LED has, for example, a wavelength-converting phosphor, for example based on garnets such as YAG: Ce. Such an LED can emit, for example, yellowish, greenish, blue-greenish or reddish light.
  • the color location is set as a function of a desired color location, in particular as a function of a threshold value around the desired color location.
  • the threshold value can be selected such that the human eye still (almost) does not perceive a change in the color location up to this threshold value.
  • an actual value is determined by means of at least one sensor, wherein a deviation between the actual value and the target color location is determined and according to the color location is set so that the target color location is reached.
  • the target color location can be set exactly or with a predetermined blur. For example, it is possible to determine the target color location within a MacAdams ellipse with a predetermined number of MacAdams threshold units.
  • the at least one sensor comprises an optical sensor.
  • any color spaces can be provided.
  • the color space of the actual value is converted into a target color space, which is determined on the basis of the described control parameters.
  • the setting of the color space is done by means of a lookup table.
  • the determination of the control parameters of the target color space can be calculated or the control parameters can be determined from a structure of pre-stored values on the basis of the actual values without separate calculation or transformation.
  • the monochromatic light-emitting diode is a red light-emitting diode.
  • the approach presented here makes it possible to set a (nearly) constant color location in a lamp or luminaire comprising a plurality of light-emitting diodes and to hold it (largely) upright.
  • a light-emitting diode may also comprise any semiconductor light-emitting element.
  • the proposed luminaire comprises at least one monochrome LED (e.g., red in color or reddish tint) and at least one "white” LED.
  • the "white” LED is a phosphor converted LED. It should be noted that the phosphor converted LED is not limited to the emission of "white” light. Rather, there are also phosphors, e.g. allow emission of violet, greenish or even reddish light.
  • the brightness and color location of the luminaire can be tracked without the need for additional LEDs or additional control effort would be necessary.
  • Fig.1 shows a schematic representation of a device for a lamp 110th
  • the luminaire 110 comprises a luminous element 109 with an optionally multistage mixing optics 101, 102, a red LED 104 and two white LEDs 103, 105.
  • a sensor 106 is arranged on the luminous element 109.
  • the sensor 106 is an optical sensor.
  • the sensor 106 is connected to a microcontroller 107 which, depending on the signal detected by means of the sensor 106, drives an LED driver 108.
  • the LEDs 103 to 105 are connected to the LED driver 108, respectively.
  • the LED driver 108 includes a current source for the red LED 104 with current regulation or PWM control. Further, the LED driver 108 includes a power source for the white LEDs 103, 105 with current regulation and PWM control.
  • the regulation of the color locus of the luminaire 110 can be effected, for example, by a correction of the values detected via the sensor 106.
  • This correction comprises a transformation of the deviation vectors (Cx, Cy, brightness) into a coordinate system of the change vectors of the control parameters (PWM red, current white and PWM white).
  • the microcontroller 107 controls e.g. via a PID control in each control parameter the sum color location and the brightness to the setpoint.
  • the deviation from the setpoint may be e.g. well below 1 SWE and thus invisible to the human eye.
  • Fig.2 shows a schematic flow diagram with steps to adjust the color location of the lamp.
  • a step 201 the LEDs are applied with a predetermined current or PWM value. This is the default setting before the actual control.
  • a change of the control parameters is carried out, and thus a color location change of the luminaire is corrected.
  • This control can be performed automatically at certain times (e.g., iterative every n minutes). It is also possible for the regulation to be started over an extent of a change; such as e.g. a change detected by the sensor may be the cause of the control. For this purpose a threshold value comparison can be used and e.g. upon reaching or exceeding the setpoint, the control can be started.
  • 3A shows a relative luminous flux ⁇ v / ⁇ v (250 ° C ) as a function of temperature for a red LED.
  • 3B shows the change of a dominant wavelength ⁇ over the temperature for the red LED.
  • the brightness of the red LED can be adjusted via the duty cycle of a PWM.
  • the current through the red LED can be increased, causing a nonlinear change in the flux of light with the current. In both cases (changing the current through the red LED or changing the PWM value) there is no significant change in the dominant wavelength and thus the color location of the red LED.
  • White LEDs also show changes in brightness and color (see Fig.4A and Fig.4B ).
  • the color space can be described eg with coordinates according to CIE 1931 as ⁇ v - Cx-Cy.
  • the tristimulus (X, Y, Z) space can be used.
  • the control is designed so that the change vectors of the Sumfarbortortes ⁇ i d cx i d T . ⁇ i d Cy i d T . ⁇ i d ⁇ vi d T by change vectors ⁇ i d cx i d PWM i + d cx ⁇ ei ⁇ ß d I ⁇ ei ⁇ ß ; ⁇ i d Cy i d PWM i + d Cy ⁇ ei ⁇ ß d I ⁇ ei ⁇ ß ; ⁇ i d ⁇ vi d PWM i + d ⁇ V ⁇ ei ⁇ ß d I ⁇ ei ⁇ ß canceled or approximately canceled.
  • this correction can also be realized via a control with the aid of a lookup table.
  • Figure 5 shows a diagram with a target color location 502, which lies approximately in the middle of an ellipse 501.
  • the Ellipse 501 exemplifies a color temperature of 2700K, the color temperature is on the Planckian curve and has a diameter of 3 SWE. Changes within this ellipse 501 are not perceived (or disturbed) by the untrained human eye.
  • the brightness of the red LED can be increased to 145% (corresponds to a current increase of approx. 170% to approx. 600mA), a correction is made d ⁇ vrot d PWM red in the direction of an arrow 505 to a color location 506.

Claims (7)

  1. Procédé de réglage d'un point de couleur d'une lampe (110) comprenant au moins une diode électroluminescente convertie au phosphore (103, 105) et au moins une diode électroluminescente monochromatique (104),
    - dans lequel un courant pour l'au moins une diode électroluminescente convertie au phosphore (103, 105) est réglé ;
    - dans lequel une modulation de largeur d'impulsion pour l'au moins une diode électroluminescente convertie au phosphore (103, 105) est réglée ;
    caractérisé en ce que
    - dans le procédé soit un courant soit une modulation de largeur d'impulsion est réglé pour l'au moins une diode électroluminescente monochromatique (104),
    - le point de couleur étant réglé en fonction d'un point de couleur théorique, en particulier en fonction d'une valeur seuil pour le point de couleur théorique, une valeur réelle étant définie au moyen d'au moins un capteur, un écart entre la valeur réelle et le point de couleur théorique étant déterminé et par conséquent le point de couleur étant réglé de sorte que le point de couleur théorique est atteint et
    - dans lequel l'au moins un capteur comprend un capteur optique.
  2. Procédé selon la revendication 1, dans lequel la valeur réelle est déterminée
    - selon un espace de couleur CIE CxCy,
    - selon un espace de couleur CIE uv,
    - selon un espace de couleur CIE u'v' et/ou
    - selon un espace du tristimulus XYZ.
  3. Procédé selon la revendication 1, dans lequel la valeur réelle est convertie en les paramètres de mise au point suivants pour le réglage du point de couleur :
    - le courant pour l'au moins une diode électroluminescente convertie au phosphore ;
    - la modulation de largeur d'impulsion pour l'au moins une diode électroluminescente convertie au phosphore ;
    - le courant pour l'au moins une diode électroluminescente monochromatique.
  4. Procédé selon l'une des revendications 1 à 3, dans lequel la valeur réelle est convertie en les paramètres de mise au point suivants pour le réglage du point de couleur :
    - le courant pour l'au moins une diode électroluminescente convertie au phosphore ;
    - la modulation de largeur d'impulsion pour l'au moins une diode électroluminescente convertie au phosphore ;
    - la modulation de largeur d'impulsion pour l'au moins une diode monochromatique.
  5. Procédé selon l'une des revendications précédentes, dans lequel le réglage du point de couleur s'effectue au moyen d'une table de conversion.
  6. Procédé selon l'une des revendications précédentes, dans lequel la diode électroluminescente convertie au phosphore émet une lumière dans au moins une des couleurs suivantes :
    - une lumière blanche,
    - une lumière violette,
    - une lumière verte,
    - une lumière rouge.
  7. Procédé selon l'une des revendications précédentes, dans lequel la diode électroluminescente monochromatique est une diode électroluminescente rouge.
EP10720393.7A 2009-05-19 2010-05-11 Procédé de réglage d'un point de couleur Active EP2433472B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009021845 2009-05-19
DE102009048871A DE102009048871A1 (de) 2009-05-19 2009-09-23 Verfahren und Vorrichtung zur Einstellung eines Farborts
PCT/EP2010/056478 WO2010133481A1 (fr) 2009-05-19 2010-05-11 Procédé et dispositif de réglage d'un point de couleur

Publications (2)

Publication Number Publication Date
EP2433472A1 EP2433472A1 (fr) 2012-03-28
EP2433472B1 true EP2433472B1 (fr) 2014-07-30

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US (1) US8604702B2 (fr)
EP (1) EP2433472B1 (fr)
CN (1) CN102428755B (fr)
DE (1) DE102009048871A1 (fr)
WO (1) WO2010133481A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100245279A1 (en) * 2009-03-31 2010-09-30 Robe Lighting S.R.O. Display and display control system for an automated luminaire
DE102010030061A1 (de) * 2010-06-15 2011-12-15 Osram Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben einer Halbleiterleuchtvorrichtung und Farbregelvorrichtung zum Durchführen des Verfahrens
CN104684216A (zh) * 2015-02-11 2015-06-03 广州市德晟照明实业有限公司 Led灯具过温保护电路及方法
TWI565905B (zh) * 2016-01-27 2017-01-11 國立清華大學 高品質光源的組合方法
CN107017240B (zh) * 2016-01-27 2019-08-20 周卓辉 光源的组合方法
CN108401314B (zh) * 2018-01-29 2019-12-13 杭州电子科技大学 基于极坐标的无极调光调色方法
US10645778B1 (en) 2018-02-13 2020-05-05 Tomar Electronics, Inc. Methods of color selection in multiple color LED lamps
US11054090B2 (en) * 2019-01-29 2021-07-06 Intematix Corporation High gamut index solid-state white light emitting devices
US11289630B2 (en) 2019-12-20 2022-03-29 Lumileds Llc Tunable lighting system with preferred color rendering

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US7764026B2 (en) * 1997-12-17 2010-07-27 Philips Solid-State Lighting Solutions, Inc. Systems and methods for digital entertainment
JP4687460B2 (ja) 2003-07-28 2011-05-25 日亜化学工業株式会社 発光装置、ｌｅｄ照明、ｌｅｄ発光装置及び発光装置の制御方法
US7009343B2 (en) * 2004-03-11 2006-03-07 Kevin Len Li Lim System and method for producing white light using LEDs
WO2008139369A1 (fr) * 2007-05-10 2008-11-20 Philips Intellectual Property & Standards Gmbh Dispositif d'éclairage avec une pluralité d'émetteurs de lumière
US8368636B2 (en) * 2007-09-21 2013-02-05 Point Somee Limited Liability Company Regulation of wavelength shift and perceived color of solid state lighting with intensity variation

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WO2010133481A1 (fr) 2010-11-25
US20120068610A1 (en) 2012-03-22
EP2433472A1 (fr) 2012-03-28
DE102009048871A1 (de) 2010-11-25
US8604702B2 (en) 2013-12-10
CN102428755B (zh) 2015-05-27
CN102428755A (zh) 2012-04-25

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