Pixoff Battery Saver

The application applies filters that can turn off pixels in AMOLED screens, thus extending battery life on your phone. It gives you the option to pick from multiple algorithm pattern filters and adjust the pixel density in said modes. You can create custom patterns inside the app and apply them to the phone’s screen.
 
It also lets you create a night filter that you reduce blue light emitted by the screen and thus help protect your eyes when you’re performing various tasks on your phone at night. The app has tools for enabling the time range of the night filter and adjusting red, blue and opacity options. Aside from this, it has a feature for enabling a black wallpaper whenever the battery runs below a certain level.