Systems and Methods for Distortion-Related Source Light Management

• US 20060262111A1
• Filed: 07/28/2006
• Published: 11/23/2006
• Est. Priority Date: 12/02/2004
• Status: Active Grant

• Current Assignee: Louis Joseph Kerofsky
• Original Assignee: Louis Joseph Kerofsky
• Inventors: Kerofsky, Louis Joseph
• Granted Patent: US 8,004,511 B2
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0653 Controlling or limiting the speed of brightness adjustment of the illumination source
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0428 Gradation resolution change
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/22 using controlled light sources
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

Embodiments of the present invention comprise systems and methods for managing display device power consumption with distortion-related parameters.

Claims

1. A method for managing display device power consumption, said method comprising:

a) establishing a power budget;

b) establishing a distortion criterion;

c) displaying a first portion of a display task using light source power levels that cause each frame of said first portion to have a distortion characteristic that conforms with said distortion criterion;

d) evaluating power consumption during said first portion of said display task; and

e) modifying said distortion criterion when said evaluating power consumption determines that a power consumption criterion is not met, said modifying thereby creating a modified distortion criterion.

2. A method as described in claim 1 wherein said modifying said distortion criterion comprises allowing a different amount of distortion.

3. A method as described in claim 1 wherein said modifying said distortion criterion comprises modifying said distortion criterion to allow more distortion when said evaluating power consumption determines that more than the budgeted amount of power was used for said displaying.

4. A method as described in claim 1 wherein said modifying said distortion criterion comprises modifying said distortion criterion to allow less distortion when said evaluating power consumption determines that less than the budgeted amount of power was used for said displaying.

5. A method as described in claim 1 further comprising repeating steps c-f for a subsequent portion of said display task using said modified distortion criterion in place of said distortion criterion.

6. A method as described in claim 1 wherein said establishing a power budget comprises estimating display battery fullness for a display battery, estimating display task power requirements and determining an amount of power that can be used to complete said display task.

7. A method as described in claim 1 further comprising modifying said distortion criterion to meet an energy budget.

8. A method as described in claim 1 wherein said distortion criterion is maintaining distortion near a constant distortion level.

9. A method as described in claim 1 wherein said distortion criterion is maintaining distortion near a non-zero distortion range.

10. A method as described in claim 1 wherein said distortion criterion is maintaining distortion below a maximum distortion level.

11. A method as described in claim 1 wherein said displaying comprises matching the slopes of the power/distortion curves for sequential frames of said display task.

12. A method for managing power consumption in a battery-powered display device, said method comprising:

a) estimating battery fullness for a display device battery;

b) estimating a power requirement for a display task;

c) estimating an initial display source light illumination level that will allow said display task to be completed with power from said battery, thereby establishing a power budget for said display task;

d) determining a distortion criterion corresponding to said initial display source light illumination level;

e) displaying a first portion of said display task using light source power levels that cause each frame of said first portion to have a distortion characteristic that conforms with said distortion criterion;

f) evaluating power consumption during said first portion of said video sequence;

g) modifying said distortion criterion when said evaluating power consumption determines that a power consumption criterion is not met, said modifying thereby creating a modified distortion criterion; and

h) repeating steps e-g for a subsequent portion of said display task using said modified distortion criterion in place of said distortion criterion.

13. A method as described in claim 12 wherein said display device is a Liquid Crystal Display (LCD) device.

14. A method as described in claim 12 wherein said modifying said distortion criterion comprises allowing a different amount of distortion.

15. A method as described in claim 12 wherein said modifying said distortion criterion comprises modifying said distortion criterion to allow more distortion when said evaluating power consumption determines that more than the budgeted amount of power was used for said displaying.

16. A method as described in claim 12 wherein said modifying said distortion criterion comprises modifying said distortion criterion to allow less distortion when said evaluating power consumption determines that less than the budgeted amount of power was used for said displaying.

17. A method as described in claim 12 wherein said distortion criterion is maintaining distortion near a constant distortion level.

18. A method as described in claim 12 wherein said distortion criterion is maintaining distortion near a non-zero distortion range.

19. A method as described in claim 12 wherein said distortion criterion is maintaining distortion below a maximum distortion level.

20. An apparatus for managing display device power consumption, said apparatus comprising:

a) a power budget;

b) a distortion criterion;

c) a display comprising a display light source modulator for displaying a first portion of a display task using light source power levels that cause each frame of said first portion to have a distortion characteristic that conforms with said distortion criterion;

d) a power consumption evaluator for evaluating power consumption during said first portion of said display task; and

e) a distortion criterion modifier for modifying said distortion criterion when said evaluating power consumption determines that a power consumption criterion is not met, said modifying thereby creating a modified distortion criterion