![]() Best to use a physical screen overlay you can put on or remove as needed as long as it doesn't interfere with your touch screen options. With the added security concerns of these apps possibly collecting screen shots and sending them to another site, I would avoid this. The reason for this I believe is because apps are supposed to operate in a way they don't intrude on each other, and a filter that lays over your screen does in fact alter the output of your display rendering. They also require a rooted device, which could void warranties. You can adjust the darkness if you need it to save your eyes when reading in the dark but it doesn't help save power any. This keeps the power up on the pixels but adds a black overlay, kind of like a screen filter. There are apps that attempt to resolve this by putting a translucent black screen over your desktop and apps. I also noticed that before the screen locks on timer, it dims to low power for a few seconds and flickers as a result. With the screen though, since the problem is only resolved when you increase the brightness just a bit above minimum, it seems anything that lowers the display power (auto brightness for example) will cause it to flicker if this setting gets too low. Just enough current goes through the motion sensor to keep it's circuits active, and that current causes a flicker in the light. I see this problem with some LED and CFL lights on motion sensor switches. If the circuit is damaged, or any corrosion has built up inside, this could attenuate the current below the point required to sustain light flow. In LED screens, a back light controls brightness, but AMOLED screens send current to each pixel for brightness control. When the display circuits get old or damaged, they don't sustain current at low power settings. In my research thus far, the AMOLED screen technology is to blame.
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