The LG G2’s Smart Screen feature makes the screen stay on when you look at the screen and go to sleep when you look away from the screen, which is similar to Galaxy S4?s Smart Stay feature. However, this feature may not work properly if you are in a dark or too bright place. How to activate LG G2’s Smart Screen Go To Settings, then tap Display and check the ‘Smart Screen’ option to activate it. Also, you can turn on and off this feature by simply double tapping your finger on the glass.
Now you get the Smart Screen activated. If it detects your eyes there will be an eye icon in your notification window.