WO2007057822A1 - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
WO2007057822A1
WO2007057822A1 PCT/IB2006/054180 IB2006054180W WO2007057822A1 WO 2007057822 A1 WO2007057822 A1 WO 2007057822A1 IB 2006054180 W IB2006054180 W IB 2006054180W WO 2007057822 A1 WO2007057822 A1 WO 2007057822A1
Authority
WO
WIPO (PCT)
Prior art keywords
lighting system
light emitting
mode
emitting diodes
diode
Prior art date
Application number
PCT/IB2006/054180
Other languages
French (fr)
Inventor
Willem L. Ijzerman
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007057822A1 publication Critical patent/WO2007057822A1/en

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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]

Definitions

  • the present invention relates to a lighting system comprising a plurality of light emitting diodes (LEDs), arranged on a substrate, and a sensor arrangement, generating at least one sensor signal.
  • LEDs light emitting diodes
  • Such a device is disclosed e.g. in US 2002/0171373.
  • a LED assembly is disclosed therein where photo diodes are integrated. These photo diodes can be used to obtain feedback signals that can be used for controlling the LEDs in the assembly. This may be used e.g. to compensate for changes in ambient temperature.
  • An object of the present invention is therefore to provide a less complex solution still providing a useful sensor signal.
  • the invention relates to a lighting system comprising a plurality of light emitting diodes, arranged on a substrate, and a sensor arrangement, capable of generating at least one sensor signal, wherein at least one of said light emitting diodes is switchable between a first mode, wherein said diode emits light, and a second mode, wherein said diode generates a current in response to light incident on the diode, and wherein the system comprises means for measuring said current in order to generate said at least one sensor signal.
  • a sensor function can be provided without providing photo diodes which results in a less complex system.
  • each of said light emitting diodes is provided with a collimating optical component.
  • a collimating optical component is reciprocal, so that it projects light received from the area illuminated by its diode.
  • the sensor signal may be used as an input signal to a camera. This means that the lighting system can even work as a simple camera.
  • the sensor signal may be a feedback signal for controlling said light emitting diodes, e.g. to adjust the lighting system color point or brightness.
  • the LED may be switched to the second mode during a time interval which is shorter than 2/100 second. This makes the procedure virtually invisible to the human eye.
  • any number from one or a few, e.g. less than four, to all LEDs may alternate between the first and the second mode during operation of the lighting system. If all LEDs are used in this way they may preferably be switched simultaneously, so that, during the second mode, an ambient light measurement can be carried out.
  • the LEDs may be arranged in a matrix where light emitting diodes in a chessboard pattern in the matrix alternate between said first and second modes.
  • Fig 1 illustrates schematically the use of a matrix illumination system.
  • Fig 2 shows a cross-section through a matrix illumination system.
  • Figs 3-5 illustrate in cross-section different examples of collimating optical components.
  • Figs 6a and 6b illustrate schematically the operation of a LED in a lighting system according to an embodiment of the invention.
  • Figs 7a and 7b illustrate an example of a possible LED layout.
  • Fig 1 illustrates schematically the use of a matrix illumination system.
  • the system comprises a carrier arrangement 1 , in the form of a plate, with a plurality of light emitting diodes (LEDs) 3, 5, etc., arranged in a pattern on the carrier.
  • the LEDs may, as illustrated in fig 1, be arranged in rows and columns, but other configurations are conceivable.
  • the LEDs may e.g. be arranged in columns that are mutually offset, they may be arranged in concentric circles, or they may be arbitrarily or randomly placed on the carrier.
  • each LED may be optically connected to a collimating optical element, so that each combination of LED and collimating optical element emits a collimated light beam 7.
  • Fig 2 shows a cross-section through a matrix illumination system.
  • the system comprises a plurality of LEDs 3, 5, etc. arranged on a carrier substrate 11 that may be made of a transparent material, e.g. transparent PMMA (Polymethylmethacrylate).
  • the substrate 11 may preferably be planar.
  • the LEDs may preferably be fed by means of transparent conductors (not shown) such as ITO (Indium Tin Oxide) conductors.
  • each LED is provided with a collimating optical component 13, 15, etc., which in the illustrated case is a compound parabolic concentrator, in the form of a TIR (Total Internal Reflection) lens.
  • Figs 3-5 illustrate in cross-section different examples of collimating optical components.
  • Fig 3 illustrates a first example, a compound parabolic concentrator (CPC) (sometimes referred to as a compound parabolic collimator) resembling a parabolic specular reflector.
  • the CPC comprises a solid body of a transparent material with a refractive index higher than air, e.g. 1.5.
  • TIR total internal reflections
  • the optical collimating component may also concentrate incoming light onto the LED. This feature can be used in an embodiment of the invention as will be described later.
  • Fig 4 illustrates a second, somewhat flatter example where an additional lens 21 is integrated in the front surface of the optical element.
  • Fig 5 illustrates a third example where the collimating optical element in addition to the front surface lens comprises circular, concentric prisms 23, 25, etc. that allow a similar collimating function as in fig 4, but with a considerably smaller optical element depth.
  • collimating optical components such as specular reflectors, may also be used.
  • Figs 6a and 6b illustrate schematically the operation of a LED 3 in a lighting system according to an embodiment of the invention.
  • a first mode illustrated in fig 6a
  • the LED is fed with a current from a controllable current source 29 and emits light.
  • the led is disconnected from the current source 29 and is connected to a current sensing device 31 instead, which measures the small current that is generated in the LED when exposed to incoming light.
  • the LED is thus capable of functioning both as a light source and a light sensor.
  • a collimating optical component such as one disclosed in any of figs 3-5 or a specular reflector functions reciprocally, i.e.
  • Another possibility is to provide an intelligent lighting system. E.g. if it is desired to have a surface evenly illuminated and a part of the surface is also illuminated by another lamp, e.g. a light bulb, it is possible to detect this and reduce the light flow from the matrix illumination system to that part of the surface.
  • a lamp e.g. a light bulb
  • the sensor signal is used as a feedback signal for controlling the light emitting diodes.
  • the light output of a LED varies, at a given current, e.g. with ambient temperature and LED age. Therefore, it is advantageous to use this feedback signal in order to adjust the lighting system color point and/or brightness to a desired level.
  • a given LED can then be used as a feedback sensor to control its neighbors, each illuminating a surface partly overlapping the surface of the given LED.
  • the diode In order to make the switching between the first and the second mode invisible to the human eye, the diode should not remain in the second mode longer than about 2/100 second or even more preferred, should remain less than 1/100 second in the second mode. In many applications however this is not necessary.
  • all or substantially all LEDs in another embodiment alternate simultaneously between the first and the second mode during operation of the lighting system.
  • the invention relates to a lighting system comprising a plurality of light emitting diodes.
  • a lighting system comprising a plurality of light emitting diodes.
  • at least one of the diodes is switched between two states. In a first state the diode emits light and in a second state the diode is switched off and use is made of the fact that the PN junction of the diode generates a small current which depends on the light incident thereon. This current is measured in order to provide the sensor signal.

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The present invention relates to a lighting system comprising a plurality of light emitting diodes. In order to obtain a sensor signal, at least one of the diodes (3) is switched between two states (MODE 1, M0DE2). In a first state (MODE 1) the diode emits light and in a second state (MODE 2) the diode is switched off and use is made of the fact that the PN junction of the diode generates a small current which depends on the light incident thereon. This current is measured in order to provide the sensor signal.

Description

Lighting device
The present invention relates to a lighting system comprising a plurality of light emitting diodes (LEDs), arranged on a substrate, and a sensor arrangement, generating at least one sensor signal.
Such a device is disclosed e.g. in US 2002/0171373. A LED assembly is disclosed therein where photo diodes are integrated. These photo diodes can be used to obtain feedback signals that can be used for controlling the LEDs in the assembly. This may be used e.g. to compensate for changes in ambient temperature.
A disadvantage with this device is that it is rather complex, which means that production costs may be high.
An object of the present invention is therefore to provide a less complex solution still providing a useful sensor signal.
This object is achieved by means of a system as defined in claim 1.
More specifically, the invention relates to a lighting system comprising a plurality of light emitting diodes, arranged on a substrate, and a sensor arrangement, capable of generating at least one sensor signal, wherein at least one of said light emitting diodes is switchable between a first mode, wherein said diode emits light, and a second mode, wherein said diode generates a current in response to light incident on the diode, and wherein the system comprises means for measuring said current in order to generate said at least one sensor signal. This means that a sensor function can be provided without providing photo diodes which results in a less complex system.
Preferably, each of said light emitting diodes is provided with a collimating optical component. Such a component is reciprocal, so that it projects light received from the area illuminated by its diode. The sensor signal may be used as an input signal to a camera. This means that the lighting system can even work as a simple camera. The sensor signal may be a feedback signal for controlling said light emitting diodes, e.g. to adjust the lighting system color point or brightness.
The LED may be switched to the second mode during a time interval which is shorter than 2/100 second. This makes the procedure virtually invisible to the human eye.
Any number from one or a few, e.g. less than four, to all LEDs may alternate between the first and the second mode during operation of the lighting system. If all LEDs are used in this way they may preferably be switched simultaneously, so that, during the second mode, an ambient light measurement can be carried out.
The LEDs may be arranged in a matrix where light emitting diodes in a chessboard pattern in the matrix alternate between said first and second modes.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
Fig 1 illustrates schematically the use of a matrix illumination system.
Fig 2 shows a cross-section through a matrix illumination system.
Figs 3-5 illustrate in cross-section different examples of collimating optical components.
Figs 6a and 6b illustrate schematically the operation of a LED in a lighting system according to an embodiment of the invention.
Figs 7a and 7b illustrate an example of a possible LED layout.
Fig 1 illustrates schematically the use of a matrix illumination system. The system comprises a carrier arrangement 1 , in the form of a plate, with a plurality of light emitting diodes (LEDs) 3, 5, etc., arranged in a pattern on the carrier. The LEDs may, as illustrated in fig 1, be arranged in rows and columns, but other configurations are conceivable. The LEDs may e.g. be arranged in columns that are mutually offset, they may be arranged in concentric circles, or they may be arbitrarily or randomly placed on the carrier. As will be illustrated later, each LED may be optically connected to a collimating optical element, so that each combination of LED and collimating optical element emits a collimated light beam 7. The LEDs on the carrier may be used to illuminate a surface 9, and since each LED may be controlled separately, the illumination may be varied over this surface in many different ways. Fig 2 shows a cross-section through a matrix illumination system. As mentioned, the system comprises a plurality of LEDs 3, 5, etc. arranged on a carrier substrate 11 that may be made of a transparent material, e.g. transparent PMMA (Polymethylmethacrylate). As illustrated, the substrate 11 may preferably be planar. If a transparent substrate is used, the LEDs may preferably be fed by means of transparent conductors (not shown) such as ITO (Indium Tin Oxide) conductors. In the illustrated system, each LED is provided with a collimating optical component 13, 15, etc., which in the illustrated case is a compound parabolic concentrator, in the form of a TIR (Total Internal Reflection) lens.
Figs 3-5 illustrate in cross-section different examples of collimating optical components. Fig 3 illustrates a first example, a compound parabolic concentrator (CPC) (sometimes referred to as a compound parabolic collimator) resembling a parabolic specular reflector. The CPC, however, comprises a solid body of a transparent material with a refractive index higher than air, e.g. 1.5. A major part of the light emitted by the LED in lateral directions is reflected at the interface between the CPC body and the surrounding air by total internal reflections (TIR). This light then exits the CPC at the front surface 19 perpendicularly to this surface as a collimated beam 7. Even though the word parabolic usually implies a cross section formed as a cone section, the cross section of a CPC may deviate from this shape to some extent. As illustrated in fig 3 the optical collimating component may also concentrate incoming light onto the LED. This feature can be used in an embodiment of the invention as will be described later.
Fig 4 illustrates a second, somewhat flatter example where an additional lens 21 is integrated in the front surface of the optical element. Fig 5 illustrates a third example where the collimating optical element in addition to the front surface lens comprises circular, concentric prisms 23, 25, etc. that allow a similar collimating function as in fig 4, but with a considerably smaller optical element depth. Of course other kinds of collimating optical components, such as specular reflectors, may also be used.
Figs 6a and 6b illustrate schematically the operation of a LED 3 in a lighting system according to an embodiment of the invention. In a first mode (MODE 1) illustrated in fig 6a, the LED is fed with a current from a controllable current source 29 and emits light. In the second mode (MODE 2) the led is disconnected from the current source 29 and is connected to a current sensing device 31 instead, which measures the small current that is generated in the LED when exposed to incoming light. The LED is thus capable of functioning both as a light source and a light sensor. A collimating optical component, such as one disclosed in any of figs 3-5 or a specular reflector functions reciprocally, i.e. serves in the second mode to concentrate, on the active area of the LED, light from the area illuminated by the LED in the first mode. There is thus a relationship between a specific area on an illuminated surface and a specific LED in both the illuminating and the sensing direction. This makes it possible even to use the lighting system as a simple camera. If a suitable proportion of the LEDs in a matrix illumination system (e.g. 50*50 LEDs) are capable of acting as sensors, it is possible to e.g. track the position of an illuminated object. A possible application would be in a vehicle where the front lighting system is also used to detect obstacles in front of the vehicle.
Another possibility is to provide an intelligent lighting system. E.g. if it is desired to have a surface evenly illuminated and a part of the surface is also illuminated by another lamp, e.g. a light bulb, it is possible to detect this and reduce the light flow from the matrix illumination system to that part of the surface.
Another possibility is to use the sensor signal as a feedback signal for controlling the light emitting diodes. The light output of a LED varies, at a given current, e.g. with ambient temperature and LED age. Therefore, it is advantageous to use this feedback signal in order to adjust the lighting system color point and/or brightness to a desired level. A given LED can then be used as a feedback sensor to control its neighbors, each illuminating a surface partly overlapping the surface of the given LED.
In order to make the switching between the first and the second mode invisible to the human eye, the diode should not remain in the second mode longer than about 2/100 second or even more preferred, should remain less than 1/100 second in the second mode. In many applications however this is not necessary.
In one embodiment quite few LEDs, perhaps four or less alternate between the first and the second mode during operation of the lighting system. This is a simple way of realizing the sensing arrangement.
In order to estimate ambient light flow on the illuminated surface in another embodiment all or substantially all LEDs in another embodiment alternate simultaneously between the first and the second mode during operation of the lighting system.
Needless to say, a number of embodiments between these two extremes are conceivable.
It is e.g. possible, when the LEDs are arranged in a matrix pattern with rows and columns as illustrated in figs 7a and 7b, that half of the LEDs, placed in a chessboard pattern, alternate between the first mode (fig 7a) and the second mode (fig 7b). In summary, the invention relates to a lighting system comprising a plurality of light emitting diodes. In order to obtain a sensor signal, at least one of the diodes is switched between two states. In a first state the diode emits light and in a second state the diode is switched off and use is made of the fact that the PN junction of the diode generates a small current which depends on the light incident thereon. This current is measured in order to provide the sensor signal.
The invention is not restricted to the described embodiments. It can be altered in different ways within the scope of the appended claims.

Claims

CLAIMS:
1. A lighting system comprising a plurality of light emitting diodes (3, 5), arranged on a substrate (11), and a sensor arrangement, capable of generating at least one sensor signal, wherein at least one of said light emitting diodes (3) is switchable between a first mode (MODE 1), wherein said diode emits light, and a second mode (MODE 2), wherein said diode (3) generates a current in response to light incident on the diode, and wherein the system comprises means (31) for measuring said current in order to generate said at least one sensor signal.
2. A lighting system according to claim 1, wherein each of said light emitting diodes is provided with to a collimating optical component (13).
3. A lighting system according to claim 1 or 2, wherein said sensor signal is a feedback signal for controlling said light emitting diodes.
4. A lighting system according to any one of the preceding claims, wherein said at least one light emitting diode is switched to said second mode during a time interval which is shorter than 2/100 second.
5. A lighting system according to any one of the preceding claims, wherein less than four light emitting diodes alternate between the first and the second mode during operation of the lighting system.
6. A lighting system according to any one of claims 1-4, wherein substantially all light emitting diodes alternate simultaneously between the first and the second mode during operation of the lighting system.
7. A lighting system according to any one of claims 1-4, wherein the light emitting diodes are arranged in a matrix and light emitting diodes in a chessboard pattern in the matrix alternate between said first and second modes.
8. A lighting system according to claim 3, wherein the feedback signal is used to adjust the lighting system color point.
9. A lighting system according to claim 3, wherein the feedback signal is used to adjust the lighting system brightness.
10. A lighting system according to claim 2, wherein said sensor signal is used as an input signal to a camera.
PCT/IB2006/054180 2005-11-21 2006-11-09 Lighting device WO2007057822A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05110998.1 2005-11-21
EP05110998 2005-11-21

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060373A1 (en) * 2007-11-07 2009-05-14 Koninklijke Philips Electronics N.V. A luminaire, a control device and a method for controlling a luminaire
DE102008061089A1 (en) * 2008-12-08 2010-06-10 Tridonicatco Schweiz Ag Address assignment for bus-compatible lighting control gear, in particular for LEDs
WO2010125496A1 (en) * 2009-04-27 2010-11-04 Koninklijke Philips Electronics N. V. Method and apparatus of driving a light source depending of the daylight
WO2010141269A3 (en) * 2009-06-02 2011-03-24 Dolby Laboratories Licensing Corporation Multi-die led package and backlight unit using the same
GB2475773A (en) * 2009-11-19 2011-06-01 Gm Global Tech Operations Inc LED lighting apparatus uses no-load voltage from unlit LED to measure LED light intensity
DE102013107855A1 (en) * 2013-07-23 2015-01-29 Osram Oled Gmbh An optoelectronic component device, method for producing an optoelectronic component device and method for operating an optoelectronic component device
WO2017067895A1 (en) * 2015-10-20 2017-04-27 Koninklijke Philips N.V. Phototherapy system and method
AT518887B1 (en) * 2009-04-29 2018-02-15 Tridonic Gmbh & Co Kg DEVICE FOR OPERATING LEDS
DE102019125364A1 (en) * 2019-09-20 2021-03-25 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung ARRANGEMENT AND PROCEDURE FOR OPERATING A DIODE ARRAY

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EP1152642A2 (en) * 2000-04-27 2001-11-07 Agilent Technologies, Inc. (a Delaware corporation) Method and apparatus for measuring spectral content of LED light source and control thereof
US20020171373A1 (en) 2001-03-29 2002-11-21 Koninklijke Philips Electronics N.V. Controlling method and system for RGB based LED luminary
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060373A1 (en) * 2007-11-07 2009-05-14 Koninklijke Philips Electronics N.V. A luminaire, a control device and a method for controlling a luminaire
DE102008061089A1 (en) * 2008-12-08 2010-06-10 Tridonicatco Schweiz Ag Address assignment for bus-compatible lighting control gear, in particular for LEDs
DE102008061089B4 (en) * 2008-12-08 2020-09-03 Tridonic Ag Allocation of addresses for bus-compatible lamp operating devices, especially for LEDs
WO2010125496A1 (en) * 2009-04-27 2010-11-04 Koninklijke Philips Electronics N. V. Method and apparatus of driving a light source depending of the daylight
AT518887B1 (en) * 2009-04-29 2018-02-15 Tridonic Gmbh & Co Kg DEVICE FOR OPERATING LEDS
AT518887A5 (en) * 2009-04-29 2018-02-15 Tridonic Gmbh & Co Kg DEVICE FOR OPERATING LEDS
WO2010141269A3 (en) * 2009-06-02 2011-03-24 Dolby Laboratories Licensing Corporation Multi-die led package and backlight unit using the same
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DE102013107855A1 (en) * 2013-07-23 2015-01-29 Osram Oled Gmbh An optoelectronic component device, method for producing an optoelectronic component device and method for operating an optoelectronic component device
DE102013107855B4 (en) 2013-07-23 2021-09-23 Pictiva Displays International Limited Optoelectronic component device, method for producing an optoelectronic component device and method for operating an optoelectronic component device
WO2017067895A1 (en) * 2015-10-20 2017-04-27 Koninklijke Philips N.V. Phototherapy system and method
DE102019125364A1 (en) * 2019-09-20 2021-03-25 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung ARRANGEMENT AND PROCEDURE FOR OPERATING A DIODE ARRAY
US11783762B2 (en) 2019-09-20 2023-10-10 Osram Opto Semiconductors Gmbh Device and method for operating a diode array

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