Non-flickering illumination based communication

• US 6,794,831 B2
• Filed: 07/23/2002
• Issued: 09/21/2004
• Est. Priority Date: 04/15/1998
• Status: Expired due to Term

• Current Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Original Assignee: Talking Lights LLC
• Inventors: Leeb, Steven B., Lupton, Elmer C., Jackson, Deron K., Hovorka, George B.
• Primary Examiner(s): Clinger, James
• Assistant Examiner(s): TRAN, THUY V
• Application Number:
  US10/201,378
• Publication Number:
  US 20030030386A1
• Time in Patent Office: 791 Days
• Field of Search: 315/307, 359/227, 359/229, 375/237-239, 375/242, 375/146-147, 375/353
• US Class Current: 315/307
• CPC Class Codes: H04B 10/1143 Bidirectional transmission
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04B 10/69 Electrical arrangements in the receiver

Abstract

A system for and method of generating electromagnetic radiation in which the radiation has both a first and second utility. The electromagnetic radiation is modulated to produce electronically detectable variations to achieve the second utility, the variations not affecting the first utility. In one embodiment, the electromagnetic radiation is visible light. In this embodiment, the first utility is illumination and the second utility is the transmission of data. In another embodiment, the invention provides a lamp for generating visible light capable of providing illumination and transmitting data to a receiver. Any variations in the visible light resulting from the data transmission are imperceptible by a human eye regardless of the nature of the data being transmitted. In yet another embodiment, a power line carrier modem may be used with the present invention to transmit information to the source.

Claims

1. A process for simultaneously providing illumination that is free to the eye of flicker and other distracting optical phenomena and for providing communication comprising the steps of:

providing a source of data comprising elements selected from a group consisting of analog data, digital data, control codes and start codes;

providing a design of an illumination means in which the illumination means can be modulated;

analyzing the nature of the data from the source of data and the design of the illumination means, to determine if the nature of the data and the design of the illumination means can create flicker visible to the eye or other distracting optical phenomena in the output of the illumination means;

based on the analysis, selecting an encoding means for the data such that it can be transmitted by modulating the illumination means without creating flicker or other distracting optical phenomena which are visible to the eye;

providing an illumination means based on said design of an illumination means;

providing a medium means through which the illumination passes;

providing a receiver means for receiving and processing the modulated illumination from the illumination means and extracting the encoded data;

providing a user means for using the data processed by the receiver means;

transmitting data from the source of data to the illumination means which then transmits the encoded data by modulating the illumination means without creating flicker or other distracting optical phenomena which are visible to the eye to the receiver means which receives and processes the modulated illumination, extracts the encoded data and supplies it to the user means.

2. The process of claim 1, wherein the data comprises analog data.

3. The process of claim 1, wherein the data comprises elements selected from a group consisting of digital data, control codes and start codes.

4. The process of claim 3, wherein the data comprises digital data.

5. The process of claim 1, wherein the data comprises elements selected from a group consisting of control codes and start codes.

6. The process of claim 1, wherein the illumination means is selected from a group consisting of fluorescent lamps, high intensity discharge iamps, light emitting diodes, lasers, cathode ray tubes, particle beam emitters, liquid crystal displays, electroluminescent panels, klystrons, masers, incandescent lamps and gas discharge lamps.

7. A process for simultaneously providing illumination which is free to the eye of flicker and other distracting optical phenomena and for providing communication comprising:

providing a source of data comprising elements selected from a group consisting of analog data, digital data, control codes and start codes;

providing an illumination means;

analyzing the nature of the data from the source of data and the design of the illumination means, to determine if the nature of the data and the design of the illumination means can create flicker visible to the eye or other distracting optical phenomena in the output of the illumination means;

based on the analysis, selecting an encoding means for the data such that it can be transmitted by modulating the illumination means without creating flicker or other distracting optical phenomena which are visible to the eye;

providing a medium means through which the illumination passes;

providing a receiver means for receiving and processing the modulated illumination from the illumination means and extracting the encoded data;

providing a user means for using the data processed by the receiver means;

transmitting data from the source of data to the illumination means which illumination means then transmits the encoded data by modulating the illumination means without creating flicker or other distracting optical phenomena which are visible to the eye to the receiver means which receives and processes the modulated illumination, extracts the encoded data and supplies it to the user means.

8. The process of claim 7 wherein the data comprises analog data.

9. The process of claim 7 wherein the data comprises elements selected from a group consisting of digital data, control codes and start codes.

10. The process of claim 9 wherein the data comprises digital data.

11. The process of claim 7 wherein the data comprises elements selected from a group consisting of control codes and start codes.

12. The process of claim 7 wherein the illumination means is selected from a group consisting of fluorescent lamps, high intensity discharge lamps, light emitting diodes, lasers, cathode ray tubes, particle beam emitters, liquid crystal displays, electroluminescent panels, klystrons, masers, incandescent lamps and gas discharge lamps.

13. A network for simultaneously providing illumination free from flicker or other distracting optical phenomena to the eye and transmitting information comprising:

a source of data with data elements selected from a group consisting of analog data, digital data, control codes and start codes;

an illumination means in which the illumination means can be modulated and emit illumination;

an encoding means for encoding the data for transmission by the illumination means;

a medium means through which the illumination passes;

a receiver means for decoding the data encoded in the illumination;

a means for analyzing the nature of the data from the source of the data and the design of the illumination means, to determine if the nature of the data and the design of the illumination means can create flicker visible to the eye or other distracting optical phenomena in the output of the illumination means; and

a user means for making use of the data decoded by the receiver means in which the encoding means is selected so that, for the data which will be transmitted and the illumination means which will be used, there will be no flicker or other distracting optical phenomena to the eye in the illumination.

14. The network of claim 13 wherein the data comprises analog data.

15. The network of claim 13 wherein the data comprises elements selected from a group consisting of digital data, control codes and start codes.

16. The network of claim 15 wherein the data comprises digital data.

17. The network of claim 13 wherein the data comprises elements selected from a group consisting of control codes and start codes.

18. The network of claim 13 wherein the illumination means is selected from a group consisting of fluorescent lamps, high intensity discharge lamps, light emitting diodes, lasers, cathode ray tubes, particle beam emitters, liquid crystal displays, electroluminescent panels, klystrons, masers, incandescent lamps and gas discharge lamps.