A free program for Android, by Top10Labs.
With Best Display/Screen filter, you can adjust the brightness of your Android phone's display to a comfortable level.
The application has a user-friendly interface, which allows you to adjust the brightness of your screen in an easy and convenient way. You can use the app in two different modes: fixed mode and dynamic mode.
Fixed mode is useful when you step into a dimly lit room. In this case, the application will automatically adjust the brightness of your screen to make it not only comfortable to read, but also preserve battery power.
Dynamic mode is useful when the phone wakes from sleep.
