Transmitting data to a rolling shutter sensor array via a light emitter array

Patent metadata

Field	Value
Publication number	US-9240839-B2
Application number	US-201414149479-A
Country	US
Kind code	B2
Filing date	Jan 7, 2014
Priority date	Jan 7, 2014
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

An array of light emitters is arranged single-file along an emitting surface of a transmitting device and emits light in a z-direction normal to the emitting surface. The array of light emitters is aligned along a y-direction normal to the z-direction. A lens assembly is optically coupled to the array of light emitters. The lens assembly includes at least one cylindrical lens and at least one aspherical lens. The lens assembly emits the light in free-space along the z-direction and has a first focal length in the y-direction and a different, second focal length in an x-direction. An encoder is coupled to apply a data signal to the array of light emitters. The data signal causes the array of light emitters to illuminate in a pattern that switches at a rate corresponding to a rolling shutter of a receiving sensor array.

First claim

What is claimed is:

1. A system comprising:
an array of light emitters arranged single-file along an emitting surface of a transmitting device and emitting light in a z-direction normal to the emitting surface, the array of light emitters aligned along a y-direction normal to the z-direction;
a lens assembly optically coupled to the array of light emitters, the lens assembly comprising at least one cylindrical lens and at least one aspherical lens, the lens assembly emitting the light in free-space along the z-direction and having a first focal length in the y-direction and a different, second focal length in an x-direction resulting in a relatively smaller y-direction field of view and a relatively larger x-direction field of view; and
an encoder coupled to apply a data signal to the array of light emitters, the data signal causing the array of light emitters to illuminate in a pattern that switches at a rate corresponding to a rolling shutter of a receiving sensor array.

2. The system of claim 1 , wherein each of the light emitters simultaneously transmits a different part of the data signal.

3. The system of claim 1 , further comprising a distance sensor that detects at least a z-direction distance between the transmitting device and the receiving sensor array, and wherein the encoder changes a resolution of the pattern in response to the detected z-direction distance.

4. The system of claim 3 , wherein changing the resolution of the pattern comprises turning off at least one light emitter of the array of light emitters.

5. The system of claim 3 , wherein changing the resolution of the pattern comprises grouping at least two light emitters in the array of light emitters to operate together.

6. The system of claim 1 , wherein the second focal length in the x-direction causes the light to extend along columns of the receiving sensor array, wherein the rolling shutter advances row-by-row.

7. The system of claim 1 , wherein the transmitting device comprises eyeglasses.

8. The system of claim 1 , further comprising a receiving device comprising the receiving sensor array, the receiving device further comprising:
a decoder coupled to retrieve data encoded in the data signal via the receiving sensor array; and
a rendering device configured to render the data to a user.

9. The system of claim 8 , wherein the receiving sensor array comprises first and second portions configured to sense the data encoded in the data signal and while simultaneously sensing other optical data.

10. The system of claim 9 , wherein the rendering device comprises a display having first and second display portions simultaneously rendering the data encoded in the data signal and the other optical data.

11. The system of claim 10 , wherein the receiving device comprises eyeglasses.

12. A method comprising:
encoding data onto a data signal;
applying the data signal to cause an array of light emitters to illuminate in a pattern that changes at a rate corresponding to a rolling shutter of a receiving sensor array, the array of light emitters arranged single-file along a y-direction of an emitting surface of a transmitting device and emitting light in a z-direction normal to the emitting surface; and
directing the light from the array of light emitters through a lens assembly that comprises at least one cylindrical lens and at least one aspherical lens, the lens assembly emitting the light in free-space along the z-direction and having a first focal length in the y -direction and a different, second focal length in an x-direction resulting in a relatively smaller y-direction field of view and a relatively larger x-direction field of view.

13. The method of claim 12 , wherein each of the light emitters simultaneously transmits a different part of the data signal.

14. The method of claim 12 , further comprising detecting at least a z-direction distance between the transmitting device and the receiving sensor array, and wherein a resolution of the pattern is changed in response to the detected z-direction distance.

15. The method of claim 14 , wherein changing the resolution of the pattern comprises turning off at least one light emitter of the array of light emitters.

16. The method of claim 14 , wherein changing the resolution of the pattern comprises grouping at least two light emitters in the array of light emitters to operate together.

17. The method of claim 12 , wherein the second focal length in the x-direction causes the light to extend along columns of the receiving sensor array, wherein the rolling shutter advances row-by-row.

18. The method of claim 12 , further comprising:
obtaining data encoded in the data signal via the receiving sensor array; and
rendering the data to a user.

19. The method of claim 18 , further comprising sensing the data encoded in the data signal via the receiving sensor array while simultaneously sensing other optical data via the receiving sensor array.

20. The method of claim 19 , further comprising rendering the data encoded in the data signal while simultaneously rendering the other optical data.

Assignees

• Nokia Corp

Inventors

• Raskar Ramesh
• Mishra Pranav
• Kannan Rajeswari

Classifications

• H04B10/1141 Primary

  One-way transmission · CPC title

• H04B10/116

  Visible light communication · CPC title

• H04B1/385

  Transceivers carried on the body, e.g. in helmets · CPC title

• H04B10/11

  Arrangements specific to free-space transmission, i.e. transmission through air or vacuum · CPC title

• H04B2001/3866

  carried on the head · CPC title