LG -K220 Guía De Usuario página 155

KnockON
You can turn the screen on or off by double-tapping the screen.
This option is available only on the Home screen provided by LG. It may
not 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.
is not 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.
Turning off the screen
Double-tap the status bar, an empty area on the Home screen or the
Lock screen.
Knock Code
screen is locked, you can directly access the Home screen by tapping the
screen in a specified sequence.
times consecutively, unlock by using your backup PIN.
Make sure to use your fingertip when tapping the screen.
Basic Functions 41