User configurable power conservation through LCD display screen reduction

• US 7,552,349 B2
• Filed: 03/07/2005
• Issued: 06/23/2009
• Est. Priority Date: 03/07/2005
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Bahl, Paramvir, Kuehnel, Thomas W., Hassan, Amer A., Bahl, Pradeep
• Primary Examiner(s): Lee; Thomas
• Assistant Examiner(s): Brown; Michael J
• Application Number:
  US11/073,901
• Publication Number:
  US 20080141049A1
• Time in Patent Office: 1,569 Days
• Field of Search: 713/320, 713/300, 713/323, 713/324, 713/330, 713/340, 345/210, 345/698
• US Class Current: 713/320
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/04 Changes in size, position or resolution of an image
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0428 Gradation resolution change
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A novel system and method increase battery life for portable computing devices through intelligent display management. A user interface allows a user to input threshold values and parameters such that power management actions are taken should battery power fall below the thresholds. Such actions include the reduction of size to the projected display, disabling of network activity, and management of intensive CPU processes.

Claims

1. A computer-readable storage medium including computer-executable instructions for conserving power on a portable computing device, the portable computing device comprising a display unit and a power unit, the power unit providing power to the display unit, the display unit providing a display at a first resolution, the computer-executable instructions comprising instructions for:

monitoring an amount of power remaining in the power unit;

determining that the remaining power falls below a first threshold level; and

in response to the amount of the remaining power falling below the first threshold level;

partitioning the display into a first portion and a second portion, wherein the first portion includes the second portion;

causing power provided to the first portion to be substantially reduced so that a size of the display is reduced to the second portion;

continuing to monitor the amount of power remaining in the power unit;

determining that the remaining power falls below a second threshold; and

in response to the amount of remaining power falling below the second threshold level;

partitioning the display into a third portion and a fourth portion; and

causing power provided to the third portion to be substantially reduced, wherein the second portion includes the fourth portion, and the size of the display is reduced to the fourth portion.

2. The computer-readable storage medium of claim 1 wherein the computer-executable instructions further comprise instructions:

reducing the first resolution provided by the display unit to a second resolution, wherein the second resolution corresponds to a size of the second portion.

3. The computer-readable storage medium of claim 2 wherein the second resolution corresponds to a standardized resolution.

4. The computer-readable storage medium of claim 1, the computer-executable instructions further comprising instructions for:

causing the second resolution provided by the display unit to be reduced to a third resolution, wherein the third resolution corresponds to a size of the fourth portion.

5. The computer-readable storage medium of claim 1 wherein the first threshold level is configured by a user of the computing device.

6. The computer-readable storage medium of claim 1 wherein the display unit is a liquid crystal display unit.

7. The computer-readable storage medium of claim 1, wherein the computer-executable instructions further comprise instructions for:

adjusting a chromatic level of the display unit such that less power is consumed by the display unit.

8. For use in a portable computing device comprising a display unit and a power unit, the power unit providing power to the display unit and the display unit providing a display at a first resolution, a user interface for managing power consumption, the user interface comprising:

a user-selectable option for setting a first power threshold; and

a user-selectable option for specifying at least one action to be performed if the power remaining in the power unit falls below the first threshold;

wherein the at least one action to be performed comprises;

substantially reducing an amount of power directed to a first portion of the display partitioned into the first portion and a second portion, wherein the first portion includes the second portion, so that a size of the display is reduced to the second portion;

causing the display unit to provide a display at a lower resolution, wherein the first resolution is reduced to the lower resolution in accordance with a reduction in the size of the display;

a user-selectable option for setting a second power threshold, the second power threshold less than the first power threshold; and

a user-selectable option for specifying at least one action to be performed if the power remaining in the power unit falls below the second threshold;

wherein the at least one action to be performed comprises;

substantially reducing an amount of power directed to a third portion of the display partitioned into the third portion and a fourth portion so that the size of the display is reduced to the fourth portion; and

causing the display unit to provide a display at a further lower resolution.

9. A method for conserving power on a portable computing device, the portable computing device comprising a display unit and a power unit, the power input providing power to the display unit and the display unit providing a display at a first resolution, the method comprising steps of:

monitoring an amount of power remaining in the power unit; and

in response to the amount of remaining power falling below a first threshold level;

partitioning the entire display into a first portion and a second portion, wherein the first portion includes the second portion;

causing power provided to the first portion to be substantially reduced so that a size of the display is reduced to the second portion;

continuing to monitor the amount of power remaining in the power unit; and

in response to the amount of remaining power falling below a second threshold level;

partitioning the entire display into a third portion and a fourth portion; and

causing power provided to the third portion to be substantially reduced so that the size of the display is reduced to the fourth portion;

wherein the third portion includes the second portion, and the first portion includes the fourth portion.

10. The method of claim 9 further comprising:

causing the first resolution provided by the display unit to reduce to a second resolution, wherein the second resolution corresponds to a size of the second portion.

11. The method of claim 10 wherein the second resolution corresponds to a standardized resolution.

12. The method of claim 9 further comprising the step of:

causing the second resolution provided by the display unit to reduce the display to a third resolution, wherein the third resolution corresponds to a size of the fourth portion.

13. The method of claim 9 wherein the first threshold level is configured by a user of the computing device.