Demo Description : 
In this Video, we show our Adaptive Display Power Management implemented on the 
game Quake3 in Desire HD.The Algorithm dynamically brightens the scene and 
compensates by reducing the backlight intensity thereby saving power on LCD Screens. 

The First scale on the UI shows the artificial brightening of the game scene. 
The Next Scale is the backlight intensity of the device.
The Final Scale shows the estimated power saved by the algorithm, 
based on the backlight intensity.

Initially, We show the effect of artificially brightening the scene, 
by increasing the artificial brightness from a scale of 1 to 3. 
We then show the effect of adjusting just the intensity of the backlight of the 
mobile display by reducing it from 255 down to 0. We have calibrated using 
light sensor experiments the mapping needed between artificial brightness 
increase and backlight intensity decrease, that maintains final perceived 
brightness.We now enable this mapping and show both the above processes 
happening hand in hand.

Finally, we have also determined, by user study, the maximum artificial 
brightness that can be added to a scene. This varies based on the brightness 
of the game scene, since the brighter the scene is, the faster quality starts 
to drop, due to saturation. From this study we determined two thresholds - 
Quality - Point at which quality drop is noticable
Playable - Point at which the game ceases to be playable.

The game is now shown with our system automatically adjusting the parameters according 
to the above thresholds, and thereby saving power with minimal loss to the user experience.