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WO2000040892A1 - Lighting system - Google Patents

Lighting system Download PDF

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Publication number
WO2000040892A1
WO2000040892A1 PCT/IB1999/002056 IB9902056W WO0040892A1 WO 2000040892 A1 WO2000040892 A1 WO 2000040892A1 IB 9902056 W IB9902056 W IB 9902056W WO 0040892 A1 WO0040892 A1 WO 0040892A1
Authority
WO
WIPO (PCT)
Prior art keywords
electroluminescent
lamps
lamp
lighting
signal
Prior art date
Application number
PCT/IB1999/002056
Other languages
French (fr)
Inventor
Nils Martensson
Original Assignee
Ipr Industries Limited
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 Ipr Industries Limited filed Critical Ipr Industries Limited
Priority to AU16758/00A priority Critical patent/AU1675800A/en
Publication of WO2000040892A1 publication Critical patent/WO2000040892A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/03—Lighting devices intended for fixed installation of surface-mounted type
    • F21S8/033—Lighting devices intended for fixed installation of surface-mounted type the surface being a wall or like vertical structure, e.g. building facade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • 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
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to lighting, in particular, lighting achieved by means of electroluminescent lamps.
  • a known electroluminescent lamp comprises a thin layer of dielectric material having phosphor particles evenly distributed throughout.
  • the dielectric is secured between two layers of conducting material, that is, two electrodes, one electrode being of a reflective material, and the other a transparent material.
  • a change in current across the dielectric having sufficient power, causes the phosphor particles to become excited, whereupon they lose this energy in the form of light.
  • an alternating current is supplied, the phosphor particles are continually excited.
  • the continual light pulses produced by the phosphor appear to the human eye as being a constant continuous illumination.
  • Electroluminescent lamps are usually operated by a alternating current in the region of 400Hz to 800Hz.
  • Electroluminescent lamps produce relatively modest amounts of light, as when compared with fluorescent and filament lighting. The thinness of the lamps also renders them fragile. There main application is for emergency lighting, and for backlighting for keypads, watches, instrument displays and the like, rather than actual illumination of objects. Electroluminescent lamps are suited to such uses in a dark background environment because human vision responds well to low levels of light provided there is sufficient contrast. The object of the present invention is to allow electroluminescent lamps to be used in more diverse applications.
  • a further object of the present invention is to equip electroluminescent lamps with additional features.
  • lighting for illumination of a room or the like comprising a plurality of similar lamps, each lamp being incorporated into a rigid structure, and a corresponding grid-like structure attached to the ceiling, or wall of the room, and upon which the lamps are installed, each lamp substantially comprising an electroluminescent panel.
  • a transmitting means is included in association with the electroluminescent lamps such that the light from the lamps incorporates a signal component.
  • electroluminescent lamps with a robust frame and backing, and disposing these units so that they act in concert, they can be used to produce sufficient quantities of light to illuminate objects some distance away, and provide enough light to illuminate a room, for example.
  • electroluminescent lamps can be usefully adapted to transmit signals, obviating conventional cable means to appliances that require signals to be carried to them. Lighting embodying the invention will now be described, by way of example, with reference to the drawings, of which;
  • Figure 1 shows an electroluminescent panel
  • Figure 2 shows a schematic representation of a communication means incorporated in the electroluminescent panel.
  • the electroluminescent panel comprises a conventional electroluminescent lamp 10, produced in the manner described above, mounted upon a supporting structure of a backing plate 15 and frame 20, and incorporating a processing means (not here shown).
  • the electroluminescent lamp 10 is affixed to a backing plate 15 by adhesive material.
  • the backing plate is sufficiently rigid to protect the electroluminescent lamp from any flexing which it may be subjected to during installation.
  • the electroluminescent lamp is a square sheet having sides of approximately 600mm.
  • the backing plate 15 is somewhat larger, so that when the electroluminescent lamp is positioned centrally, the backing plate extends so as to form a border around the whole of the electroluminescent lamp.
  • the terminals of the electroluminescent lamp's electrodes 17 extend through the backing plate.
  • the electroluminescent panel could be of a different size or shape, although a square or rectangle would be the most convenient. If the electroluminescent panels are to be supplied in various shapes, ideally these should multiples of the basic square, such as a rectangular panel of 600mm x 1200mm, so that all the panels are compatible for being fitted together.
  • the frame 20 is a rectangular structure composed of four rigid members of L-shaped cross section.
  • the backing plate 15 fits inside this frame, and is supported by it.
  • the backing plate may be secured to the frame 20 by an ad esive, preferably including or incorporating a compressible, resilient layer or component to further protect the electroluminescent lamp from jolts when being installed.
  • a protective transparent or translucent plate could, if desired, be placed over the electroluminescent lamp 20 for further protection.
  • the backing plate and frame are both made from a lightweight rigid metal.
  • a grid of members In order to illuminate a room, a grid of members, the members having an inverted T-shaped cross section, are arranged somewhat below the true ceiling.
  • the electroluminescent panels are then placed upon the supporting grid in a manner similar to the installation of traditional ceiling tiles.
  • Other features present in conventional ceiling tiles, such as sound and heat insulation, or loudspeaker means, could be incorporated into the panels.
  • Other conventional methods and arrangements of fitting ceiling tiles could easily be applied to the electroluminescent panels.
  • the electroluminescent panels could additionally or alternatively be installed upon walls, or with sufficient strengthening, floors.
  • the terminals of the electroluminescent lamp extend through the backing plate, making connection of the panels a straightforward affair.
  • the current could be supplied by a conductor incorporated in the supporting grid.
  • a modification of the invention contains means to enable the electroluminescent panel 55 to be used to transmit signals to appliances that would otherwise require a dedicated signal carrying means.
  • a signal, intended for an appliance 50, is converted by a coder/decoder unit 30 and combined with the AC mains supply (electroluminescent devices can be operated at between 40 and 220 volts) directed to the electroluminescent panels by a signal driver 32, this voltage having a significantly lower frequency than that of the signal.
  • Methods of including a signal with the power voltage are well known.
  • Each lamp includes a demodulator 34, a coder/decoder unit 36, a signal driver 38, and a frequency converter 40.
  • the modulated supply voltage upon reaching the electroluminescent panel 55, has its signal component removed by the demodulator 34. The remaining supply voltage is converted from the domestic mains frequency of 50Hz to the operating frequency of the electroluminescent lamp. The signal is then recoded by the coder/decoder unit, before being recombined with the supply voltage.
  • the appliance to be signalled includes an optocoupler receiver 44, a high-pass filter 46, and a coder/decoder unit 48.
  • the optocoupler receiver 44 converts the light signal into an electrical signal. A component of this signal though will be due to the intensity variation present in any electroluminescent lamp due to the application of alternating current exciting the phosphor particles.
  • the frequency due to powering the electroluminescent lamp is stripped from the receiver's voltage and discarded by a high-pass filter 46, leaving only the useful signal. This is then converted to a form understandable to the appliance 50 by the coder/decoder unit, which is then connected in the same way in which the substituted cable would have been connected.
  • This system could be used, for example, to allow a personal computer to remain portable and unencumbered by cable, but able to receive a telecommunication signal.
  • the system preferably uses standard sockets to interface with the appliance, and the signal provider, so that once the system is installed, the user does not have to alter the connection means already supplied with the appliance and the signal providing means Alternatively, the appliances could have optocoupler receivers built into them.
  • each signal could be coded at a different frequency.
  • a signal transmitted to an appliance by the system so described, would be available to the appliance through different lamps simultaneously.
  • the attenuation and interference due to the different distances from each lamp to the appliance are not likely to be serious, but the difference in length of the power cable and these lamps may cause an attenuation problem when high transmission rates are attempted.
  • a single signal could therefore be coded at different frequencies upon different lamps, the appliance locking on to the strongest frequency presented to it.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Architecture (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

Lighting for illumination of a room or the like, comprising a plurality of similar lamps, each lamp being incorporated into a rigid structure, and a corresponding grid-like structure attached to the ceiling, or wall of the room, and upon which the lamps are installed, each lamp substantially comprising an electroluminescent panel. The electroluminescent lamps include a transmission means, so that they can transmit signals to equipment adapted to receive it. The signal may be incorporated into the power supplied to the lamps, conveniently as a frequency variation.

Description

LIGHTING SYSTEM
The present invention relates to lighting, in particular, lighting achieved by means of electroluminescent lamps.
A known electroluminescent lamp comprises a thin layer of dielectric material having phosphor particles evenly distributed throughout. The dielectric is secured between two layers of conducting material, that is, two electrodes, one electrode being of a reflective material, and the other a transparent material. A change in current across the dielectric, having sufficient power, causes the phosphor particles to become excited, whereupon they lose this energy in the form of light. When an alternating current is supplied, the phosphor particles are continually excited. At a sufficiently high frequency, the continual light pulses produced by the phosphor appear to the human eye as being a constant continuous illumination. Electroluminescent lamps are usually operated by a alternating current in the region of 400Hz to 800Hz.
Electroluminescent lamps produce relatively modest amounts of light, as when compared with fluorescent and filament lighting. The thinness of the lamps also renders them fragile. There main application is for emergency lighting, and for backlighting for keypads, watches, instrument displays and the like, rather than actual illumination of objects. Electroluminescent lamps are suited to such uses in a dark background environment because human vision responds well to low levels of light provided there is sufficient contrast. The object of the present invention is to allow electroluminescent lamps to be used in more diverse applications.
A further object of the present invention is to equip electroluminescent lamps with additional features.
According to the present invention there is provided lighting for illumination of a room or the like comprising a plurality of similar lamps, each lamp being incorporated into a rigid structure, and a corresponding grid-like structure attached to the ceiling, or wall of the room, and upon which the lamps are installed, each lamp substantially comprising an electroluminescent panel.
Preferably a transmitting means is included in association with the electroluminescent lamps such that the light from the lamps incorporates a signal component.
According to other aspects of the present invention there is provided lamp, and a receiving means as defined above.
By providing electroluminescent lamps with a robust frame and backing, and disposing these units so that they act in concert, they can be used to produce sufficient quantities of light to illuminate objects some distance away, and provide enough light to illuminate a room, for example.
Certain characteristics of electroluminescent lamps can be usefully adapted to transmit signals, obviating conventional cable means to appliances that require signals to be carried to them. Lighting embodying the invention will now be described, by way of example, with reference to the drawings, of which;
Figure 1 shows an electroluminescent panel, and
Figure 2 shows a schematic representation of a communication means incorporated in the electroluminescent panel.
Referring to Figure 1, the electroluminescent panel comprises a conventional electroluminescent lamp 10, produced in the manner described above, mounted upon a supporting structure of a backing plate 15 and frame 20, and incorporating a processing means (not here shown). The electroluminescent lamp 10 is affixed to a backing plate 15 by adhesive material. The backing plate is sufficiently rigid to protect the electroluminescent lamp from any flexing which it may be subjected to during installation. The electroluminescent lamp is a square sheet having sides of approximately 600mm. The backing plate 15 is somewhat larger, so that when the electroluminescent lamp is positioned centrally, the backing plate extends so as to form a border around the whole of the electroluminescent lamp. The terminals of the electroluminescent lamp's electrodes 17 extend through the backing plate. Naturally, the electroluminescent panel could be of a different size or shape, although a square or rectangle would be the most convenient. If the electroluminescent panels are to be supplied in various shapes, ideally these should multiples of the basic square, such as a rectangular panel of 600mm x 1200mm, so that all the panels are compatible for being fitted together. The frame 20 is a rectangular structure composed of four rigid members of L-shaped cross section. The backing plate 15 fits inside this frame, and is supported by it. The backing plate may be secured to the frame 20 by an ad esive, preferably including or incorporating a compressible, resilient layer or component to further protect the electroluminescent lamp from jolts when being installed. A protective transparent or translucent plate could, if desired, be placed over the electroluminescent lamp 20 for further protection. The backing plate and frame are both made from a lightweight rigid metal.
In order to illuminate a room, a grid of members, the members having an inverted T-shaped cross section, are arranged somewhat below the true ceiling. The electroluminescent panels are then placed upon the supporting grid in a manner similar to the installation of traditional ceiling tiles. Other features present in conventional ceiling tiles, such as sound and heat insulation, or loudspeaker means, could be incorporated into the panels. Other conventional methods and arrangements of fitting ceiling tiles could easily be applied to the electroluminescent panels. Equally, the electroluminescent panels could additionally or alternatively be installed upon walls, or with sufficient strengthening, floors.
Since the amount of light produced is dependent upon the total area of the electroluminescent material, placing lamps over the entire surface of the ceiling will be sufficient to adequately illuminate the room.
The terminals of the electroluminescent lamp extend through the backing plate, making connection of the panels a straightforward affair. Alternatively, the current could be supplied by a conductor incorporated in the supporting grid.
Referring to Figure 2, a modification of the invention contains means to enable the electroluminescent panel 55 to be used to transmit signals to appliances that would otherwise require a dedicated signal carrying means. A signal, intended for an appliance 50, is converted by a coder/decoder unit 30 and combined with the AC mains supply (electroluminescent devices can be operated at between 40 and 220 volts) directed to the electroluminescent panels by a signal driver 32, this voltage having a significantly lower frequency than that of the signal. Methods of including a signal with the power voltage are well known.
Each lamp includes a demodulator 34, a coder/decoder unit 36, a signal driver 38, and a frequency converter 40. The modulated supply voltage, upon reaching the electroluminescent panel 55, has its signal component removed by the demodulator 34. The remaining supply voltage is converted from the domestic mains frequency of 50Hz to the operating frequency of the electroluminescent lamp. The signal is then recoded by the coder/decoder unit, before being recombined with the supply voltage.
It may be found that it is unnecessary to change the coding of the signal between the electroluminescent panels' power cable, and the alternating current applied to the electroluminescent lamp's electrodes. However, the attenuation characteristics of the power cable and of the electroluminescent panel's power line may be different, and may therefore call for different methods of coding to preserve the integrity of the signal. The light produced by the electroluminescent panel will now have a signal component causing the light production to vary. This variation in intensity will be at a very high frequency, and not apparent to a person's perception.
The appliance to be signalled includes an optocoupler receiver 44, a high-pass filter 46, and a coder/decoder unit 48. The optocoupler receiver 44 converts the light signal into an electrical signal. A component of this signal though will be due to the intensity variation present in any electroluminescent lamp due to the application of alternating current exciting the phosphor particles. The frequency due to powering the electroluminescent lamp is stripped from the receiver's voltage and discarded by a high-pass filter 46, leaving only the useful signal. This is then converted to a form understandable to the appliance 50 by the coder/decoder unit, which is then connected in the same way in which the substituted cable would have been connected.
As in the transferral of the signal between the power cable and the electroluminescent panel's power line, it may be found unnecessary to include the coder/decoder unit 48 between the signal received by the optocoupler receiver 44 and the appliance 50, the signal being sent over the whole system in the coding form necessary for the appliance.
This system could be used, for example, to allow a personal computer to remain portable and unencumbered by cable, but able to receive a telecommunication signal. The system preferably uses standard sockets to interface with the appliance, and the signal provider, so that once the system is installed, the user does not have to alter the connection means already supplied with the appliance and the signal providing means Alternatively, the appliances could have optocoupler receivers built into them.
Several different signals could be sent to several different appliances by the same set of electroluminescent panels. Most simply, each signal could be coded at a different frequency. A signal transmitted to an appliance by the system so described, would be available to the appliance through different lamps simultaneously. The attenuation and interference due to the different distances from each lamp to the appliance are not likely to be serious, but the difference in length of the power cable and these lamps may cause an attenuation problem when high transmission rates are attempted. A single signal could therefore be coded at different frequencies upon different lamps, the appliance locking on to the strongest frequency presented to it.

Claims

1. Lighting for illumination of a room or the like comprising a plurality of similar lamps, each lamp being incorporated into a rigid structure, and a corresponding grid-like structure attached to the ceiling, or wall of the room, and upon which the lamps are installed, each lamp substantially comprising an electroluminescent panel.
2. Lighting according to the previous claim, wherein a transmitting means is included in association with the electroluminescent lamps such that the light from the lamps incorporates a signal component.
3. Lighting according to claim 2, wherein the signal component is included in the power supplied to the electroluminescent lamp.
4. Lighting according to either of claims 2 or 3, wherein there is provided a frequency converter such that the power supplied is converted to a frequency suitable for the electroluminescent lamp, and a coder/decoder unit, the coder/decoder unit disposed so as to act in association with the frequency converter.
5. A lamp according to any previous claim.
6. Receiving means including an optocoupler receiver for receiving a signal component according to any of claim 2 to 4.
7. Receiving means according to Claim 6 wherein there is provided a coder/decoder unit disposed so as to act upon the signal component between the optocoupler receiver and the appliance.
8. Lighting substantially as herein described and illustrated.
9. Receiving means substantially as herein described and illustrated.
10. Any novel and inventive feature or combination of features specifically disclosed herein within the meaning of Article 4H of the
International Convention (Paris Convention).
PCT/IB1999/002056 1999-01-08 1999-12-28 Lighting system WO2000040892A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU16758/00A AU1675800A (en) 1999-01-08 1999-12-28 Lighting system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9900258.6 1999-01-08
GBGB9900258.6A GB9900258D0 (en) 1999-01-08 1999-01-08 Lighting

Publications (1)

Publication Number Publication Date
WO2000040892A1 true WO2000040892A1 (en) 2000-07-13

Family

ID=10845665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/002056 WO2000040892A1 (en) 1999-01-08 1999-12-28 Lighting system

Country Status (3)

Country Link
AU (1) AU1675800A (en)
GB (1) GB9900258D0 (en)
WO (1) WO2000040892A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2424777A (en) * 2005-04-01 2006-10-04 Agilent Technologies Inc Transmitting a wake-up instruction to a receiving device by modulating data on illumination light, such as that provided by an electroluminescent room light.
FR2898226A1 (en) * 2006-03-06 2007-09-07 Excem Soc Par Actions Simplifi ELECTROLUMINESCENT TRANSMISSION DEVICE FOR OPTICAL TRANSMISSION IN FREE SPACE
US7408426B2 (en) 2003-03-13 2008-08-05 Zxtalk Assets, Llc Method and device for transmission without crosstalk
US7477069B2 (en) 2003-03-06 2009-01-13 Zxtalk Assets, Llc Digital method and device for transmission with reduced crosstalk
WO2014198615A1 (en) * 2013-06-10 2014-12-18 Koninklijke Philips N.V. Embedded lighting ceiling tiles with an adaptive ceiling luminance distribution

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155324A (en) * 1961-08-23 1964-11-03 Westinghouse Electric Corp Ceiling lighting fixtures
EP0456462A2 (en) * 1990-05-09 1991-11-13 Michael William Smith Electronic display device, display setting apparatus and display system
US5479326A (en) * 1983-01-18 1995-12-26 Nilssen; Ole K. Ceiling system with readily movable lighting panels
DE19607468A1 (en) * 1996-02-28 1997-09-04 Michael Scharf Photosignal system for information transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155324A (en) * 1961-08-23 1964-11-03 Westinghouse Electric Corp Ceiling lighting fixtures
US5479326A (en) * 1983-01-18 1995-12-26 Nilssen; Ole K. Ceiling system with readily movable lighting panels
EP0456462A2 (en) * 1990-05-09 1991-11-13 Michael William Smith Electronic display device, display setting apparatus and display system
DE19607468A1 (en) * 1996-02-28 1997-09-04 Michael Scharf Photosignal system for information transmission

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7477069B2 (en) 2003-03-06 2009-01-13 Zxtalk Assets, Llc Digital method and device for transmission with reduced crosstalk
US7764083B2 (en) 2003-03-06 2010-07-27 Frederic Broyde Digital method and device for transmission with reduced crosstalk
US7408426B2 (en) 2003-03-13 2008-08-05 Zxtalk Assets, Llc Method and device for transmission without crosstalk
GB2424777A (en) * 2005-04-01 2006-10-04 Agilent Technologies Inc Transmitting a wake-up instruction to a receiving device by modulating data on illumination light, such as that provided by an electroluminescent room light.
FR2898226A1 (en) * 2006-03-06 2007-09-07 Excem Soc Par Actions Simplifi ELECTROLUMINESCENT TRANSMISSION DEVICE FOR OPTICAL TRANSMISSION IN FREE SPACE
WO2007101942A1 (en) * 2006-03-06 2007-09-13 Zxtalk Assets, Llc Electroluminescent emission device for optical transmission in free space
US20090310973A1 (en) * 2006-03-06 2009-12-17 Zxtalk Assets, Llc Electroluminescent Emission Device for Optical Transmission in Free Space
WO2014198615A1 (en) * 2013-06-10 2014-12-18 Koninklijke Philips N.V. Embedded lighting ceiling tiles with an adaptive ceiling luminance distribution
US9603222B2 (en) 2013-06-10 2017-03-21 Philips Lighting Holding B.V. Embedded lighting ceiling tiles with an adaptive ceiling luminance distribution

Also Published As

Publication number Publication date
AU1675800A (en) 2000-07-24
GB9900258D0 (en) 1999-02-24

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