WO2009024912A2 - Generating first/second light in first/second mode - Google Patents

Generating first/second light in first/second mode Download PDF

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Publication number
WO2009024912A2
WO2009024912A2 PCT/IB2008/053297 IB2008053297W WO2009024912A2 WO 2009024912 A2 WO2009024912 A2 WO 2009024912A2 IB 2008053297 W IB2008053297 W IB 2008053297W WO 2009024912 A2 WO2009024912 A2 WO 2009024912A2
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WO
WIPO (PCT)
Prior art keywords
light
generator
mode
modes
arrangement
Prior art date
Application number
PCT/IB2008/053297
Other languages
French (fr)
Other versions
WO2009024912A3 (en
Inventor
Dirk Hente
Joseph H. A. M. Jacobs
Original Assignee
Philips Intellectual Property & Standards Gmbh
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.)
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Publication date
Application filed by Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N. V. filed Critical Philips Intellectual Property & Standards Gmbh
Publication of WO2009024912A2 publication Critical patent/WO2009024912A2/en
Publication of WO2009024912A3 publication Critical patent/WO2009024912A3/en

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
    • G09F2013/222—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent with LEDs

Definitions

  • the invention relates to an arrangement for generating light, to a device comprising an arrangement for generating light, and to a method for generating light.
  • Examples of such an arrangement are circuits comprising light sources or light holders.
  • Examples of such a device are consumer products and non-consumer products.
  • WO 2006/049807 discloses in its abstract a multi-mode flat-panel light- emitting sign having a substrate, a plurality of thin- film light-emitting structures located on the substrate, each structure comprising an anode, a light-emitting layer, and a cathode, wherein the light-emitting layer has a pattern for providing a visual indicia when the light-emitting structure is activated.
  • This multi-mode flat-panel light-emitting sign is not relatively fail-safe.
  • Further objects of the invention are to provide a device comprising an arrangement for generating light and to provide a method for generating light in a relatively fail-safe way.
  • a first aspect of the invention provides an arrangement for generating light, comprising
  • a second generator for generating second light in a second mode
  • a detector for detecting a problem with one of the generators
  • the first and second generators are for example light sources or are for example light holders that need to be provided with light sources etc.
  • the first generator is active, which means that the first generator is connected to a power source such as a voltage source or a current source etc.
  • the second generator is active, which means that the second generator is connected to the same or another power source.
  • the detector detects a problem with the first generator in case of the arrangement being in the first mode or with the second generator in case of the arrangement being in the second mode respectively. This problem is for example a change in a current value and/or in a voltage value and/or in a power value and/or in a temperature value etc.
  • the switch switches the arrangement from the first mode into the second mode or from the second mode into the first mode respectively.
  • an arrangement is defined by further comprising
  • the detected problem being a malfunction of at least a part of the first generator or of at least a part of the first power source or of at least a part of the first coupling, said one of the modes being the first mode and said other one of the modes being the second mode.
  • the first generator In the first mode, the first generator is active, which means that the first generator is connected to the first power source such as a voltage source or a current source etc.
  • the switch switches the arrangement from the first mode into the second mode.
  • the first generator is a main generator
  • the first mode is a main mode
  • the second generator is a standby generator
  • the second mode is a standby mode.
  • an arrangement is defined by the first power source being a mains supply and the second power source being a battery supply.
  • the battery supply is a chargeable battery supply that in the first mode is charged via the mains supply.
  • an arrangement is defined by the first generator comprising a first group of light emitting diodes and the second generator comprising a second group of light emitting diodes.
  • the light emitting diodes may be basic light emitting diodes or organic light emitting diodes etc. and without having excluded other kinds of light emitting diodes.
  • an arrangement is defined by the first and second groups being interleaved and/or stacked groups.
  • Interleaved groups are for example groups located in a same plane and/or located next to each other.
  • Stacked groups are for example groups located in different planes and/or located on top of each other. So, when being stacked, an upper group may need to be transparent to let the light from a lower group pass, or some kind of interleaving may need to be used too.
  • an arrangement is defined by the first group comprising a first number of serial circuits to be fed via a mains supply and the second group comprising a second number of serial circuits to be fed via a battery supply, the first number being larger than the second number.
  • a mains supply generates a higher voltage than a battery supply.
  • the first number of serial circuits to be fed via the mains supply has to be larger than the second number of serial circuits to be fed via the battery supply.
  • a second aspect of the invention provides a device comprising an arrangement according to the invention for displaying first information in the first mode and second information in the second mode.
  • the first and second information may each comprise a text and/or a sign and/or another kind of information etc.
  • a device is defined by the first and second information comprising the same information.
  • a device is defined by further comprising
  • the detected problem being a malfunction of at least a part of the first generator or of at least a part of the first power source or of at least a part of the first coupling, said one of the modes being the first mode and said other one of the modes being the second mode.
  • the device may need to be connected to the first power source and may comprise the second power source.
  • a third aspect of the invention provides a method for generating light, comprising
  • Embodiments of the device and the method correspond with the embodiments of the arrangement.
  • An insight might be that a relatively fail-safe arrangement should at least have parallel generators.
  • a basic idea might be that different generators should generate different light in different modes and that in response to a detected problem with a generator the arrangement should be switched into another mode.
  • the invention solves a problem to provide an arrangement for generating light in a relatively fail-safe way.
  • the invention is further advantageous in that hardware can be minimized.
  • Fig. 1 shows diagrammatically a device according to the invention comprising an arrangement according to the invention
  • Fig. 2 shows a first embodiment of first and second generators of the arrangement in top view
  • Fig. 3 shows a second embodiment of the first and second generators in side view
  • Fig. 4 shows a third embodiment of the first and second generators in side view.
  • a device 1 according to the invention comprising an arrangement 2-5 according to the invention.
  • the arrangement 2-5 comprises a first generator 2 for generating first light in a first mode.
  • a first generator 2 may be a first light source or a first light holder that needs to be provided with a first light source etc.
  • the arrangement 2-5 comprises a second generator 3 for generating second light in a second mode.
  • Such a second generator 3 may be a second light source or a second light holder that needs to be provided with a second light source etc.
  • the first generator 2 is active, which means that the first generator 2 is connected to a power source such as a voltage source or a current source etc.
  • the second generator 3 is active, which means that the second generator 3 is connected to the same or another power source.
  • the arrangement 2-5 further comprises a detector 4 for detecting a problem with one of the generators 2-3.
  • This problem might be for example a change in a current value of a current flowing through (at least a part of) one of the generators 2-3 or flowing from the power source to one of the generators 2-3 and/or might be for example a change in a voltage value of a voltage present across (at least a part of) one of the generators 2-3 or across the power source and/or might be for example a change in a power value of the power used by (at least a part of) one of the generators 2-3 or by the power source and/or might be for example a change in a temperature value of a temperature of (at least a part of) one of the generators 2-3 or of the power source and/or might be for example considered to be a problem with one of the modes etc.
  • the arrangement 2-5 comprises a switch 5 for in response to a detected problem switching the arrangement 2-5 from one of the modes into the other one of the modes.
  • the switch 5 may comprise one or more mechanical switching elements and/or one or more electrical switching elements and/or one or more other kinds of switching elements.
  • the first generator 2 may be connected via a first coupling and/or via (at least a part of) the switch 5 to a first power source 6 such as for example a mains supply.
  • the second generator 3 may be connected via a second coupling and/or via (at least a part of) the switch 5 to a second power source 7 such as for example a battery supply.
  • the detected problem might be a malfunction of at least a part of the first generator 2 or of at least a part of the first power source 6 or of at least a part of the first coupling, in which case the switch 5 will have to switch from the first mode into the second mode, and back (for example in response to another detection and/or in response to an automatic action such as a clock input etc. and/or in response to a user action etc.).
  • the detector 4 and the switch 5 might be integrated and/or combined. Further alternatively, the switch 5 may be integrated into and/or combined with either the generators 2-3 or the power sources 6-7.
  • the detector 4 is coupled to one or more of the generators 2-3 and/or to one or more of the couplings and/or to one or more of the power sources 6-7.
  • first and second generators 2-3 of the arrangement 2-5 is shown in top view.
  • the first generator 2 comprises a first group of light emitting diodes 200-249 and the second generator 3 comprising a second group of light emitting diodes 300-304.
  • the first group comprises five sub-groups of each ten serial light emitting diodes
  • the second group comprises five sub-groups of each one light emitting diode.
  • Other numbers of sub-groups and of light emitting diodes are not to be excluded.
  • the first and second groups are interleaved, and for example I-shaped as shown or F-shaped not shown etc.
  • the first group comprises a first number of serial circuits such as the light emitting diodes to be fed via a mains supply and the second group comprises a second number of serial circuits such as the light emitting diodes to be fed via a battery supply, whereby usually the first number will be larger than the second number owing to the fact that usually a (rectified) mains voltage will be larger than a battery voltage.
  • a second embodiment of the first and second generators 2-3 is shown in side view.
  • the first and second generators 2-3 are stacked, and the second (top) generator 3 and an intermediate layer 8 need to be transparent to let the first light from the first (bottom) generator 2 pass.
  • a third embodiment of the first and second generators 2-3 is shown in side view.
  • the first and second generators 2-3 are stacked, and according to a first option, the first (top) generator 2 needs to be transparent to let the second light from the second (bottom) generator 3 pass.
  • a second option between parts of the first (top) generator 2 there needs to be sufficient space to let the second light from the second (bottom) generator 3 pass.
  • This second option is a combination of interleaved and stacked generators 2-3.
  • the device 1 shown in the Fig. 1 displays the same information (EXIT) in both modes, but it is not to be excluded that such a device 1 might display first information in the first mode and second information in the second mode.
  • a converter such as a power converter may be used, whereby the converter may be turned on and off and/or whereby a state of the converter may be changed to drive the generators 2-3.
  • Such a converter introduces more hardware, but might reduce and/or delete a necessity to use generators with different groups of serial elements comprising different numbers of serial elements.
  • arrangements 2-5 for generating light in a relatively failsafe way are provided with first generators 2 such as first groups of light emitting diodes 200-249 for generating first light in first modes and with second generators 3 such as second groups of light emitting diodes 300-304 for generating second light in second modes and with detectors 4 for detecting problems with one of the generators 2-3 and with switches 5 for in response to detected problems switching the arrangement 2-5 between the modes.
  • the first generators 2 are connected via first couplings to first power sources 6 such as mains supplies and the second generators 3 are connected via second couplings to second power sources 7 such as battery supplies.
  • the first and second groups may be interleaved and/or stacked groups.
  • Devices 1 comprise arrangements 2-5 for displaying different or the same information in both modes.
  • a computer program may be stored / distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope.

Abstract

Arrangements (2-5) for generating light in a relatively fail-safe way are provided with first generators (2) such as first groups of light emitting diodes (200-249) for generating first light in first modes and with second generators (3) such as second groups of light emitting diodes (300-304) for generating second light in second modes and with detectors (4) for detecting problems with one of the generators (2-3) and with switches (5) for in response to detected problems switching the arrangement (2-5) between the modes. The first generators (2) are connected via first couplings to first power sources (6) such as mains supplies and the second generators (3) are connected via second couplings to second power sources (7) such as battery supplies. The first and second groups may be interleaved and/or stacked groups. Devices (1) comprise arrangements (2-5) for displaying different or the same information in both modes.

Description

Generating first/second light in first/second mode
FIELD OF THE INVENTION
The invention relates to an arrangement for generating light, to a device comprising an arrangement for generating light, and to a method for generating light. Examples of such an arrangement are circuits comprising light sources or light holders. Examples of such a device are consumer products and non-consumer products.
BACKGROUND OF THE INVENTION
WO 2006/049807 discloses in its abstract a multi-mode flat-panel light- emitting sign having a substrate, a plurality of thin- film light-emitting structures located on the substrate, each structure comprising an anode, a light-emitting layer, and a cathode, wherein the light-emitting layer has a pattern for providing a visual indicia when the light-emitting structure is activated.
This multi-mode flat-panel light-emitting sign is not relatively fail-safe.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an arrangement for generating light in a relatively fail-safe way.
Further objects of the invention are to provide a device comprising an arrangement for generating light and to provide a method for generating light in a relatively fail-safe way.
A first aspect of the invention provides an arrangement for generating light, comprising
- a first generator for generating first light in a first mode,
- a second generator for generating second light in a second mode, - a detector for detecting a problem with one of the generators, and
- a switch for in response to a detected problem switching the arrangement from one of the modes into the other one of the modes.
The first and second generators are for example light sources or are for example light holders that need to be provided with light sources etc. In the first mode, the first generator is active, which means that the first generator is connected to a power source such as a voltage source or a current source etc. In the second mode, the second generator is active, which means that the second generator is connected to the same or another power source. The detector detects a problem with the first generator in case of the arrangement being in the first mode or with the second generator in case of the arrangement being in the second mode respectively. This problem is for example a change in a current value and/or in a voltage value and/or in a power value and/or in a temperature value etc. In response to the detected problem, the switch switches the arrangement from the first mode into the second mode or from the second mode into the first mode respectively. As a result, as soon as one of the generators has a problem, the other one will take over, and the arrangement is relatively fail-safe.
Further generators, further modes, further detectors, further problems and further switches are not to be excluded.
According to an embodiment, an arrangement is defined by further comprising
- a first coupling for connecting the first generator to a first power source, and
- a second coupling for connecting the second generator to a second power source, the detected problem being a malfunction of at least a part of the first generator or of at least a part of the first power source or of at least a part of the first coupling, said one of the modes being the first mode and said other one of the modes being the second mode.
In the first mode, the first generator is active, which means that the first generator is connected to the first power source such as a voltage source or a current source etc. As soon as the detector has detected a problem with the first generator, the switch switches the arrangement from the first mode into the second mode. In this case, the first generator is a main generator, the first mode is a main mode, the second generator is a standby generator and the second mode is a standby mode. According to an embodiment, an arrangement is defined by the first power source being a mains supply and the second power source being a battery supply.
Preferably, the battery supply is a chargeable battery supply that in the first mode is charged via the mains supply.
According to an embodiment, an arrangement is defined by the first generator comprising a first group of light emitting diodes and the second generator comprising a second group of light emitting diodes.
The light emitting diodes may be basic light emitting diodes or organic light emitting diodes etc. and without having excluded other kinds of light emitting diodes. According to an embodiment, an arrangement is defined by the first and second groups being interleaved and/or stacked groups.
Interleaved groups are for example groups located in a same plane and/or located next to each other. Stacked groups are for example groups located in different planes and/or located on top of each other. So, when being stacked, an upper group may need to be transparent to let the light from a lower group pass, or some kind of interleaving may need to be used too.
According to an embodiment, an arrangement is defined by the first group comprising a first number of serial circuits to be fed via a mains supply and the second group comprising a second number of serial circuits to be fed via a battery supply, the first number being larger than the second number.
Usually, a mains supply generates a higher voltage than a battery supply. To avoid a converter, the first number of serial circuits to be fed via the mains supply has to be larger than the second number of serial circuits to be fed via the battery supply.
A second aspect of the invention provides a device comprising an arrangement according to the invention for displaying first information in the first mode and second information in the second mode.
The first and second information may each comprise a text and/or a sign and/or another kind of information etc.
According to an embodiment, a device is defined by the first and second information comprising the same information.
When letting the device display the same information in both modes, a user might not be able to see a difference between both modes, or a user might be informed about a difference between both modes by for example using different intensities and/or different frequencies and/or different colors etc. According to an embodiment, a device is defined by further comprising
- a first coupling for connecting the first generator to a first power source, and
- a second coupling for connecting the second generator to a second power source, the detected problem being a malfunction of at least a part of the first generator or of at least a part of the first power source or of at least a part of the first coupling, said one of the modes being the first mode and said other one of the modes being the second mode.
Usually, the device may need to be connected to the first power source and may comprise the second power source.
A third aspect of the invention provides a method for generating light, comprising
- a first step of generating first light in a first mode,
- a second step of generating second light in a second mode, - a third step of detecting a problem with one of the first and second steps, and
- a fourth step of, in response to a detected problem, switching from one of the modes into the other one of the modes.
Embodiments of the device and the method correspond with the embodiments of the arrangement. An insight might be that a relatively fail-safe arrangement should at least have parallel generators.
A basic idea might be that different generators should generate different light in different modes and that in response to a detected problem with a generator the arrangement should be switched into another mode.
The invention solves a problem to provide an arrangement for generating light in a relatively fail-safe way.
The invention is further advantageous in that hardware can be minimized.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings: Fig. 1 shows diagrammatically a device according to the invention comprising an arrangement according to the invention,
Fig. 2 shows a first embodiment of first and second generators of the arrangement in top view,
Fig. 3 shows a second embodiment of the first and second generators in side view, and
Fig. 4 shows a third embodiment of the first and second generators in side view.
DETAILED DESCRIPTION OF EMBODIMENTS
In the Fig. 1, a device 1 according to the invention is shown comprising an arrangement 2-5 according to the invention. The arrangement 2-5 comprises a first generator 2 for generating first light in a first mode. Such a first generator 2 may be a first light source or a first light holder that needs to be provided with a first light source etc. The arrangement 2-5 comprises a second generator 3 for generating second light in a second mode. Such a second generator 3 may be a second light source or a second light holder that needs to be provided with a second light source etc. In the first mode, the first generator 2 is active, which means that the first generator 2 is connected to a power source such as a voltage source or a current source etc. In the second mode, the second generator 3 is active, which means that the second generator 3 is connected to the same or another power source.
The arrangement 2-5 further comprises a detector 4 for detecting a problem with one of the generators 2-3. This problem might be for example a change in a current value of a current flowing through (at least a part of) one of the generators 2-3 or flowing from the power source to one of the generators 2-3 and/or might be for example a change in a voltage value of a voltage present across (at least a part of) one of the generators 2-3 or across the power source and/or might be for example a change in a power value of the power used by (at least a part of) one of the generators 2-3 or by the power source and/or might be for example a change in a temperature value of a temperature of (at least a part of) one of the generators 2-3 or of the power source and/or might be for example considered to be a problem with one of the modes etc. The arrangement 2-5 comprises a switch 5 for in response to a detected problem switching the arrangement 2-5 from one of the modes into the other one of the modes. As a result, as soon as one of the generators 2-3 has a problem, the other one will take over, and the arrangement 2-5 is relatively fail-safe.
The switch 5 may comprise one or more mechanical switching elements and/or one or more electrical switching elements and/or one or more other kinds of switching elements.
The first generator 2 may be connected via a first coupling and/or via (at least a part of) the switch 5 to a first power source 6 such as for example a mains supply. The second generator 3 may be connected via a second coupling and/or via (at least a part of) the switch 5 to a second power source 7 such as for example a battery supply. The detected problem might be a malfunction of at least a part of the first generator 2 or of at least a part of the first power source 6 or of at least a part of the first coupling, in which case the switch 5 will have to switch from the first mode into the second mode, and back (for example in response to another detection and/or in response to an automatic action such as a clock input etc. and/or in response to a user action etc.).
Alternatively, the detector 4 and the switch 5 might be integrated and/or combined. Further alternatively, the switch 5 may be integrated into and/or combined with either the generators 2-3 or the power sources 6-7. The detector 4 is coupled to one or more of the generators 2-3 and/or to one or more of the couplings and/or to one or more of the power sources 6-7.
In the Fig. 2, a first embodiment of first and second generators 2-3 of the arrangement 2-5 is shown in top view. The first generator 2 comprises a first group of light emitting diodes 200-249 and the second generator 3 comprising a second group of light emitting diodes 300-304. In this case, the first group comprises five sub-groups of each ten serial light emitting diodes, and the second group comprises five sub-groups of each one light emitting diode. Other numbers of sub-groups and of light emitting diodes are not to be excluded. In the Fig. 2, the first and second groups are interleaved, and for example I-shaped as shown or F-shaped not shown etc. Preferably, to avoid a converter, the first group comprises a first number of serial circuits such as the light emitting diodes to be fed via a mains supply and the second group comprises a second number of serial circuits such as the light emitting diodes to be fed via a battery supply, whereby usually the first number will be larger than the second number owing to the fact that usually a (rectified) mains voltage will be larger than a battery voltage.
In the Fig. 3, a second embodiment of the first and second generators 2-3 is shown in side view. In this case, the first and second generators 2-3 are stacked, and the second (top) generator 3 and an intermediate layer 8 need to be transparent to let the first light from the first (bottom) generator 2 pass. In the Fig. 4, a third embodiment of the first and second generators 2-3 is shown in side view. In this case, the first and second generators 2-3 are stacked, and according to a first option, the first (top) generator 2 needs to be transparent to let the second light from the second (bottom) generator 3 pass. According to a second option, between parts of the first (top) generator 2 there needs to be sufficient space to let the second light from the second (bottom) generator 3 pass. This second option is a combination of interleaved and stacked generators 2-3.
The device 1 shown in the Fig. 1 displays the same information (EXIT) in both modes, but it is not to be excluded that such a device 1 might display first information in the first mode and second information in the second mode. A converter such as a power converter may be used, whereby the converter may be turned on and off and/or whereby a state of the converter may be changed to drive the generators 2-3. Such a converter introduces more hardware, but might reduce and/or delete a necessity to use generators with different groups of serial elements comprising different numbers of serial elements. Summarizing, arrangements 2-5 for generating light in a relatively failsafe way are provided with first generators 2 such as first groups of light emitting diodes 200-249 for generating first light in first modes and with second generators 3 such as second groups of light emitting diodes 300-304 for generating second light in second modes and with detectors 4 for detecting problems with one of the generators 2-3 and with switches 5 for in response to detected problems switching the arrangement 2-5 between the modes. The first generators 2 are connected via first couplings to first power sources 6 such as mains supplies and the second generators 3 are connected via second couplings to second power sources 7 such as battery supplies. The first and second groups may be interleaved and/or stacked groups. Devices 1 comprise arrangements 2-5 for displaying different or the same information in both modes.
While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage. A computer program may be stored / distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope.

Claims

CLAIMS:
1. An arrangement (2, 3, 4, 5) for generating light, comprising
- a first generator (2) for generating first light in a first mode,
- a second generator (3) for generating second light in a second mode, - a detector (4) for detecting a problem with one of the generators (2, 3), and
- a switch (5) for in response to a detected problem switching the arrangement (2, 3, 4, 5) from one of the modes into the other one of the modes.
2. An arrangement (2, 3, 4, 5) as claimed in claim 1, further comprising - a first coupling for connecting the first generator (2) to a first power source (6), and
- a second coupling for connecting the second generator (3) to a second power source
(V), the detected problem being a malfunction of at least a part of the first generator (2) or of at least a part of the first power source (6) or of at least a part of the first coupling, said one of the modes being the first mode and said other one of the modes being the second mode.
3. An arrangement (2, 3, 4, 5) as claimed in claim 2, the first power source (6) being a mains supply and the second power source (7) being a battery supply.
4. An arrangement (2, 3, 4, 5) as claimed in claim 1, the first generator (2) comprising a first group of light emitting diodes (200-249) and the second generator (3) comprising a second group of light emitting diodes (300-304).
5. An arrangement (2, 3, 4, 5) as claimed in claim 4, the first and second groups being interleaved and/or stacked groups.
6. An arrangement (2, 3, 4, 5) as claimed in claim 4, the first group comprising a first number of serial circuits to be fed via a mains supply and the second group comprising a second number of serial circuits to be fed via a battery supply, the first number being larger than the second number.
7. A device (1) comprising an arrangement (2, 3, 4, 5) as claimed in claim 1 for displaying first information in the first mode and second information in the second mode.
8. A device (1) as claimed in claim 7, the first and second information comprising the same information.
9. A device (1) as claimed in claim 7, further comprising
- a first coupling for connecting the first generator (2) to a first power source (6), and - a second coupling for connecting the second generator (3) to a second power source
(V), the detected problem being a malfunction of at least a part of the first generator (2) or of at least a part of the first power source (6) or of at least a part of the first coupling, said one of the modes being the first mode and said other one of the modes being the second mode.
10. A method for generating light, comprising
- a first step of generating first light in a first mode,
- a second step of generating second light in a second mode, - a third step of detecting a problem with one of the first and second steps, and
- a fourth step of, in response to a detected problem, switching from one of the modes into the other one of the modes.
PCT/IB2008/053297 2007-08-21 2008-08-18 Generating first/second light in first/second mode WO2009024912A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07114655 2007-08-21
EP07114655.9 2007-08-21

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WO2009024912A2 true WO2009024912A2 (en) 2009-02-26
WO2009024912A3 WO2009024912A3 (en) 2009-04-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287309A (en) * 1994-03-09 1995-09-13 Forest City Signs Limited Lighting unit
GB2341017A (en) * 1998-08-25 2000-03-01 George Alan Limpkin Substituting defective light sources
WO2002067637A1 (en) * 2001-02-16 2002-08-29 Raynesway Construction Southern Ltd Road lighting system
US20050231459A1 (en) * 2004-04-20 2005-10-20 Sony Corporation Constant current driving device, backlight light source device, and color liquid crystal display device
EP1610287A1 (en) * 2003-03-20 2005-12-28 Ryotaro Ojima Organic el display system in combination with transparent solar cell, advertisement information providing system using transparent organic el display, advertisement information providing method using the system, and recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287309A (en) * 1994-03-09 1995-09-13 Forest City Signs Limited Lighting unit
GB2341017A (en) * 1998-08-25 2000-03-01 George Alan Limpkin Substituting defective light sources
WO2002067637A1 (en) * 2001-02-16 2002-08-29 Raynesway Construction Southern Ltd Road lighting system
EP1610287A1 (en) * 2003-03-20 2005-12-28 Ryotaro Ojima Organic el display system in combination with transparent solar cell, advertisement information providing system using transparent organic el display, advertisement information providing method using the system, and recording medium
US20050231459A1 (en) * 2004-04-20 2005-10-20 Sony Corporation Constant current driving device, backlight light source device, and color liquid crystal display device

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TW200926096A (en) 2009-06-16

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