Performance control of ambient light sensors

• US 9,865,227 B2
• Filed: 08/22/2016
• Issued: 01/09/2018
• Est. Priority Date: 07/01/2013
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Mankowski, Peter, Idzik, Jacek
• Primary Examiner(s): POLO, GUSTAVO D
• Application Number:
  US15/243,567
• Publication Number:
  US 20160358585A1
• Time in Patent Office: 505 Days
• Field of Search: 345175
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

A device and method to control measurements of light intensity are described. The device includes two or more ambient light sensors arranged at respective surface locations of the device, each of the two or more ambient light sensors measuring the light intensity at the respective surface location. The device also includes a processor to control operation of the two or more ambient light sensors.

Claims

1. A device to control measurements of light intensity, the device comprising:

two or more ambient light sensors arranged at respective surface locations of the device, each of the two or more ambient light sensors configured to measure the light intensity at the respective surface location; and

a processor configured to control operation of the two or more ambient light sensors based on an application being executed by the device such that during execution of the application, the two or more ambient light sensors collect a plurality of light intensity samples per measurement cycle in a particular order and/or with a particular frequency,

wherein the processor is further configured to adjust one of a sensitivity level or a wavelength band of the two or more ambient light sensors based on previous measurements of the light intensity by the two or more ambient light sensors.

2. The device according to claim 1, wherein the processor is further configured to adjust operation of the two or more ambient light sensors according to a sampling pattern.

3. The device according to claim 2, wherein the two or more ambient light sensors measure light intensity simultaneously or in sequence with one another in response to adjusting operation according to the sampling pattern.

4. The device according to claim 1, wherein the processor is further configured to change a frequency of the light intensity measurements by the two or more ambient light sensors based on a second application being executed by the device.

5. The device according to claim 4, wherein the processor changes the frequency of the light intensity measurements such that during execution of the second application, the two or more ambient light sensors obtain more or less light intensity samples per second after changing the frequency, the frequency being different than the particular frequency used during execution of the application.

6. The device according to claim 1, wherein the processor changes a sequence of the light intensity measurements by the two or more ambient light sensors based on a second application being executed by the device such that during execution of the second application, the two or more ambient light sensors measure light intensity in a different order than the particular order used during execution of the application.

7. The device according to claim 1, wherein the processor controls the two or more ambient light sensors to separately measure light intensity for a first set of measurement cycles, and in response to detecting that an ambient light level is below a minimum threshold level, the processor controls the two or more ambient light sensors to measure the light intensity simultaneously for a second set of measurement cycles.

8. The device according to claim 1, wherein the processor controls the two or more ambient light sensors to measure the light intensity in a sequence such that the two or more ambient light sensors separately measure light intensity at different times than one another, and wherein the processor is configured to compare separate light intensity measurements from each of the two or more ambient light sensors in order to recognize at least one of AC ripple, false readings, or screen smudge.

9. The device according to claim 1, wherein the two or more ambient light sensors detect the light intensity using narrow viewing angles that define cylindrical-shaped zones of reception rather than cone-shaped zones of reception, wherein the narrow viewing angles are configured such that the cylindrical-shaped zones of reception do not overlap with another.

10. The device according to claim 9, wherein the two or more ambient light sensors indicate a direction of a light source relative to the device based on separate light intensity measurements, and wherein the two or more ambient light sensors comprise three ambient light sensors arranged in a triangular pattern.

11. A method of controlling measurements of light intensity in a device, the method comprising:

measuring, using two or more ambient light sensors arranged at respective surface locations of the device, the light intensity at the respective surface locations;

controlling operation of the two or more ambient light sensors based on an application being executed by the device such that during execution of the application, the two or more ambient light sensors collect a plurality of light intensity samples per measurement cycle in a particular order and/or with a particular frequency; and

adjusting one of a sensitivity level or a wavelength band of the two or more ambient light sensors based on previous measurements of the light intensity by the two or more ambient light sensors.

12. The method according to claim 11, further comprising adjusting operation of the two or more ambient light sensors according to a sampling pattern in which the two or more ambient light sensors measure light intensity simultaneously or in sequence with one another.

13. The method according to claim 11, further comprising determining a change in ambient light based on the previous measurements of the light intensity by the two or more ambient light sensors, and adjusting one of the sensitivity level or the wavelength band of the two or more ambient light sensors based on the change in ambient light.

14. The method according to claim 11, wherein the controlling the operation of the two or more ambient light sensors includes changing a frequency of the light intensity measurements by the two or more ambient light sensors such that the two or more ambient light sensors obtain more or less light intensity samples per second after changing the frequency.

15. The method according to claim 11, wherein the controlling the operation of the two or more ambient light sensors includes changing a sequence of the light intensity measurements by the two or more ambient light sensors such that the two or more ambient light sensors measure light intensity in a different order than prior to changing the sequence.

16. The method according to claim 11, wherein the controlling the operation of the two or more ambient light sensors includes controlling the two or more ambient light sensors to measure light intensity simultaneously in response to detecting that an ambient light level is below a minimum threshold level.

17. The method according to claim 11, wherein the controlling the operation of the two or more ambient light sensors includes controlling the two or more ambient light sensors to measure the light intensity in a sequence such that the two or more ambient light sensors separately measure light intensity at different times than one another, wherein the device is configured to compare separate light intensity measurements from each of the two or more ambient light sensors in order to detect AC ripple, false readings, and/or screen smudge.

18. The method according to claim 11, wherein the two or more ambient light sensors comprise three ambient light sensors arranged in a triangular pattern, and when ambient light measured by one of the ambient lights sensors falls below a minimum threshold, light intensity measurements from the other two ambient light sensors are used to detect an actual reduction in ambient light.

19. The method according to claim 11, wherein the two or more ambient light sensors detect the light intensity using narrow viewing angles that defines cylindrical-shaped zones of reception rather than cone-shaped zones of reception, wherein the narrow viewing angles are configured such that the cylindrical-shaped zones of reception do not overlap with another.

20. The method according to claim 19, further comprising determining a direction of a light source relative to the device based on separate light intensity measurements.