On many devices, the display is even with completely down-regulated brightness still too bright. Unnecessary battery consumption and unpleasant to the eye. Here helps Screendim. For me absolutely indispensable. Since this is just a software problem is completely incomprehensible to me why the manufacturers limit the brightness control artificially down. Unfortunately, the free Rootdim does not work on all devices. (Although rooted). Since manufacturers build any unnecessary frills in their equipment, but simple things like a usable brightness control Omit. Maybe they test their devices with attached welding glasses ??? I dont know. Therefore, thank you for this app.