Luminance suppression power conservation
Described herein are systems and methods that reduce power consumption for an electronics device including a display. The systems and methods alter video information in a display area and reduce power for a display device when a graphics item is enlarged and the enlargement threatens to increase perceived luminance for the graphics item or increase aggregate luminance for the display area. Altering the video information reduces the luminance of video information in at least the graphics item when enlarged. This may offset perceived luminance gained by human visual processing when an item increases in size. If the graphics item is smaller than the display area after enlargement, then other video information in the display area may also be altered to conserve power.
1. A method for reducing power consumed by an electronics device that includes a display device, the method comprising:
displaying initial video information that contributes to an initial aggregate luminance output by the display device;
in response to new video information that includes an increase in size for a graphics item that includes a graphics window for output on the display device, where the new video information will lead to a new aggregate luminance for the display device that is greater than the initial aggregate luminance, altering the new video information, which includes altering video information for at least a portion of the graphics item that includes a central white portion of the graphics window after the increase in size, to produce altered video information that contributes to a reduced aggregate luminance for the display device that is less than the new aggregate luminance; and
displaying the altered video information, wherein the display device consumes less power when displaying the altered video information than would be consumed for display of the new video information.
2. The method of claim 1 wherein the reduced aggregate luminance is less than the initial aggregate luminance and consumes less power for the display device than would be consumed for display of the initial video information.
3. The method of claim 1 wherein the reduced aggregate luminance is within an error band of the initial aggregate luminance.
4. The method of claim 1 wherein the graphics window, after the increase in size, does not occupy an entire display area for the display device, and the method further comprises altering other video information in the display area outside the graphics window to reduce an aggregate luminance for the display area.
5. The method of claim 1 wherein the display device includes pixel granularity power consumption.
6. The method of claim 5 wherein the display device includes an organic light emitting diode device and altering the video information includes reducing a red, green or blue pixel value that also reduces power consumption for the organic light emitting diode device.
7. The method of claim 1 wherein the display device includes a liquid crystal display device and reducing power consumption for the display device includes changing a backlight included in the liquid crystal display device to a lower backlight luminance level.
8. The method of claim 7 wherein further comprising altering the new video information includes changing the transmissivity of the new video information.
9. The method of claim 8 wherein altering the video information includes increasing the transmissivity for pixels that display the altered video information.
10. The method of claim 1 wherein the graphics window was included in the initial video information at a smaller size.
11. The method of claim 1 wherein the graphics window increases in size in response to initiating the graphics window.
12. The method of claim 11 wherein initiating the graphics window includes initiating a program corresponding to the graphics window.