A really simple way to get a darker screen, a screen dimmer.
Darker - Screen Dimmer
Want a darker screen? Try out this screen dimmer.
Sometimes you can get really tired eyes from looking at your smart phones screen all day. More importantly, looking at it before you go to sleep increases activity in your brain and makes it more difficult to get solid rest. What's the solution? A screen dimmer, an application that you can use to get a darker screen - that you can adjust the brightness of to suit your needs and use patterns. Darker is a really easy screen dimmer to use, you just open the application and a new screen comes up with a dial in it that you can turn up or down to change the darkness off the screen filter. As you change the darkness the value updates inside the dial to show you how dark your screen is. You can then go back to what you were doing by dragging the application's panel down, and you can re-access the panel or stop Darker completely from your notifications bar.