LG X screen Instruction Manual page 185

KnockON
You can turn on or off the screen by double-tapping the screen.
NOTE
This option is available only on the Home screen provided by LG. It may not
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function properly on a custom launcher or on the Home screen installed by
the user.
When tapping the screen, use your fingertip. Do not use a fingernail.
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To use the KnockON feature, make sure that the proximity/light sensor is not
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blocked by a sticker or any other foreign substance.
Turning on the screen
Double-tap the middle of the screen.
Tapping the top or bottom of the screen may decrease the recognition rate.
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Turning off the screen
Double-tap on an empty space on the Home screen or Lock screen.
Alternatively, double-tap an empty space on the status bar.
Basic Functions
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