Pixoff: Battery Saver AMOLED
PIXOFF serves to save battery by applying a filter that turns off pixels. Fully user configurable, it allows several different types of predefined patterns and densities as well...
Deep Sleep Battery Saver Pro
Deep Sleep Battery Saver Pro allows for deep sleeping a device while the screen is off in order to save battery power. It costs $3.28 and includes in app purchases.
It cointains a hibernate function to maximize the battery charge. And it works pretty well.
Pixel OFF Save Battery AMOLED
Pixel OFF uses Amoled's unique feature that it can turn off individual pixels completely. It turn off some individual pixels, reducing the power draw by the display