Light illumination compensation for mobile computing devices

• US 8,060,136 B2
• Filed: 08/08/2007
• Issued: 11/15/2011
• Est. Priority Date: 08/08/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Embler, Gary L.
• Primary Examiner(s): LE, DANH C
• Application Number:
  US11/891,061
• Publication Number:
  US 20090042606A1
• Time in Patent Office: 1,560 Days
• Field of Search: 455/550.1, 455/556.1, 455/566, 345/204, 345/73, 345/77
• US Class Current: 455/556.1
• CPC Class Codes: H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials

Abstract

A mobile computing device includes a housing, a light source, a power circuit, and a processing circuit. The housing is configured to be carried by a user while in use. The power circuit is coupled to the light source. The processing circuit is configured to provide control signals to the power circuit to illuminate the light source. The processing circuit is configured to count the illuminations of the light source, to store usage data based on the counted illuminations, and to adjust the control signals based on the usage data.

Claims

1. A mobile computing device, comprising:

a housing;

a light source, at least partially contained within the housing;

a power circuit coupled to the light source; and

a processing circuit configured to provide control signals to the power circuit to illuminate the light source, wherein the processing circuit is configured to (i) count the illuminations of the light source, (ii) store usage data based on the counted illuminations, and (iii) adjust the control signals based on the usage data and on a particular illumination operation.

2. The mobile computing device of claim 1, wherein the light source comprises a light emitting diode.

3. The mobile computing device of claim 2, wherein the light source comprises a plurality of different-colored light emitting diodes configured to emit substantially white light.

4. The mobile computing device of claim 3, wherein the power circuit comprises a plurality of power output lines, each power output line coupled to a different one of the plurality of different-colored light emitting diodes, wherein the processing circuit is configured to provide control signals which independently control the different light emitting diodes, wherein at least one of the different light emitting diodes is controlled based on the usage data.

5. The mobile computing device of claim 4, wherein the processing circuit is configured to determine a chromaticity shift in light provided by the different light emitting diodes based on the usage data and to control the different light emitting diodes to correct for the chromaticity shift.

6. The mobile computing device of claim 1, wherein the usage data is based on a quantity of illuminations over a lifetime of the light source.

7. The mobile computing device of claim 1, wherein the usage data is based on a quantity of illuminations over a predetermined period of time less than 1 hour.

8. The mobile computing device of claim 1, further comprising a digital camera configured to capture an image.

9. The mobile computing device of claim 8, wherein the light source is configured to provide a flash.

10. The mobile computing device of claim 8, wherein the light source is configured to provide a continuous illumination.

11. The mobile computing device of claim 1, further comprising a flat-screen display, wherein the light source is configured to illuminate the flat-screen display.

12. The mobile computing device of claim 1, wherein the light source comprises a white phosphor light emitting diode.

13. The mobile computing device of claim 1, wherein the mobile computing device comprises a display fixed in a coplanar or parallel plane with a plurality of input devices.

14. The mobile computing device of claim 1, further comprising a wireless telephone.

15. The mobile computing device of claim 1, wherein the processing circuit is configured to operate a plurality of personal information management applications and to synchronize the personal information management applications with a remote computer.