Use APKPure App
Get Pixel off: Battery Saver old version APK for Android
Save battery by turning off screen pixels
On the AMOLED screens the pixels are turned off when they have to show black, so the black we see on an AMOLED screen is not black painted, are pixels off that not consume battery.
This application allows you to turn off screen pixels with four modes and 19 different intensity levels to save battery power, the more pixels you turn off the more battery you can save.