Spatial-based power savings

• US 7,580,033 B2
• Filed: 07/15/2004
• Issued: 08/25/2009
• Est. Priority Date: 07/16/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Honeywood Technologies LLC
• Inventors: Plut, William J.
• Primary Examiner(s): Shankar, Vijay
• Application Number:
  US10/891,734
• Publication Number:
  US 20050052446A1
• Time in Patent Office: 1,867 Days
• Field of Search: 345204-215, 345 76-104, 345690-699, 713300-340
• US Class Current: 345/211
• CPC Class Codes: G06F 1/3218 of display devices
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Described herein are systems and methods that reduce power consumption for an electronics device that includes a display. Power conservation systems and methods described herein alter video information in one or more inactive portions of a display area such that the alteration decreases power consumption. The invention finds use with many electronics devices, such as portable computing devices powered from a battery or other limited source of power. Since video output often dominates power consumption for an electronics device, decreasing display power consumption may extends battery longevity for the portable device.

Claims

1. A system for reducing power consumed by a liquid crystal display device, the system comprising:

a monitoring apparatus designed or configured to monitor user activity in a display area for the liquid crystal display device and to separate the display area into an active portion based on user activity in the active portion and an inactive portion that is outside the active portion;

a power conservation control designed or configured to receive user activity information provided by the monitoring apparatus, to determine an alteration for the video information in the inactive portion such that luminance for the video information in the inactive portion decreases, reduce backlight luminance in the inactive portion for a backlight included in the liquid crystal display device such that the display device will consume less power when displaying the altered video information along with the reduced backlight luminance, and to output a signal indicative of the alteration;

a video adaptor designed or configured to receive the signal from the power conservation control, alter the video information in the inactive portion based on the signal, and output the altered video information; and

at least one display buffer designed or configured to receive the altered video information and output, to the display device, a) active portion video information for display in the active portion of the display area, and b) the altered video information for display in the inactive portion, which is for display while the active portion video information is displayed and while the backlight luminance is reduced in the inactive portion.

2. The system of claim 1 wherein the monitoring apparatus is designed or configured to separate the display area into an active graphics component based on user activity in a perimeter of the active graphics component that defines the active portion and an inactive graphics component that is outside the active portion.

3. The system of claim 1 further comprising increasing pixel luminance of video information in the active area when the backlight is reduced.

4. A system for reducing power consumed by a device including a liquid crystal display device, the system comprising:

a monitoring apparatus designed or configured to monitor user activity in a display area for the liquid crystal display device and separate the display area into an active portion based on user activity in the active portion and an inactive portion that is outside the active portion;

a power conservation apparatus designed or configured to receive user activity information produced by the monitoring apparatus, alter video information in the inactive portion such that luminance for the video information in the inactive portion decreases, reduce backlight luminance in the inactive portion for a backlight included in the liquid crystal display device such that the display device will consume less power when displaying the altered video information along with the reduced backlight luminance, and to output the altered video information; and

at least one display buffer designed or configured to receive the altered video information and to output, to the display device, a) active portion video information for display in the active portion of the display area, and b) the altered video information for display in the inactive portion, which is for display while the active portion video information is displayed and while the backlight luminance is reduced in the inactive portion.

5. The system of claim 4 wherein the monitoring apparatus is designed or configured to separate the display area into an active graphics component based on user activity in a perimeter of the active graphics component that defines the active portion and an inactive graphics component that is outside the active portion.

6. The system of claim 4 wherein the power conservation apparatus comprises a power conservation control that determines the alteration to the video information in the inactive portion according to stored power conservation logic, and outputs a signal indicative of the alteration.

7. The system of claim 6 wherein the power conservation apparatus further comprises a video adaptor that receives the signal produced by the power conservation control and alters the video information in the inactive portion based on the signal.

8. A system for reducing power consumed by a liquid crystal display device, the system comprising:

a monitoring apparatus designed or configured to monitor user activity in a display area for the liquid crystal display device and separate the display area into an active portion based on user activity in the active portion and an inactive portion that is outside the active portion; and

a power conservation apparatus designed or configured to a) receive user activity information produced by the monitoring apparatus, b) alter video information in the inactive portion such that luminance for the video information in the inactive portion decreases, c) reduce backlight luminance in the inactive portion for a backlight included in the liquid crystal display device such that the display device will consume less power while displaying the altered video information, and d) output the video information in the active portion and the altered video information while the backlight luminance is reduced in the inactive portion.

9. The system of claim 8 further comprising at least one display buffer that receives the altered video information and is designed to output, to the display device, a) active portion video information for display in the active portion of the display area, and b) the altered video information for display in the inactive portion, which is for display while the active portion video information is displayed.

10. The system of claim 8 wherein the power conservation apparatus comprises a power conservation control designed or configured to determine the alteration to the video information in the inactive portion according to stored power conservation instructions, and to output a signal indicative of the alteration.

11. The system of claim 10 wherein the power conservation apparatus further comprises a video adaptor designed or configured to receive the signal produced by the power conservation control and to alter the video information in the inactive portion based on the signal.

12. The system of claim 8 wherein the monitoring apparatus is designed or configured to separate the display area into an active graphics component based on user activity in a perimeter of the active graphics component that defines the active portion and an inactive background that includes video information outside the active portion.

13. The system of claim 8 further comprising an edge detection apparatus designed or configured to probe video information for a graphics component, to build perimeter information for the graphics component, and to output the perimeter information for the graphics component to one of:

the monitoring apparatus and the power conservation apparatus.

14. The system of claim 8 wherein the monitoring apparatus is designed or configured to receive digital information from an input device that allows a user to position a pointer within the display area.

15. The system of claim 8 further comprising a clock that provides a temporal reference for the user activity and provides a temporal signal to the monitoring apparatus or the power conservation apparatus.

16. The system of claim 8 wherein the power conservation apparatus is designed or configured to alter the video information in the inactive portion after a threshold inactivity time of inactivity in the inactive portion.

17. The system of claim 8 wherein the power conservation apparatus applies a second alteration to the altered video information in the inactive portion after a first power reduction interval.

18. The system of claim 8 wherein the alteration reduces one of a red, green, or blue value for a set of pixels in the inactive portion such that the display device will consume less power when displaying the altered video information.

19. The system of claim 8 wherein the power conservation apparatus, in response to user activity in the inactive portion, reactivates the video information in the inactive portion as it was existed before the alteration.

20. The system of claim 8 further comprising increasing pixel luminance of video information in the active area when the backlight is reduced.