Google ANDROID Quick Start Guide (4.4, KitKat) - Manual (Page 23)

ANDROID QUICK START GUIDE ESSENTIALS 19
Lock screen
If a lock is set for your screen, the screen goes dark and locks
when the display goes to sleep or if you press the Power button.
You can set locks of different strengths using lock settings:
1. Go to Settings > Personal > Security > Screen lock.
2. Touch the type of lock you’d like to use.
Lock screen actions
From the lock screen:
• If you have a tablet that’s set up for more than one user, you
may need to touch your image at the bottom of the screen to
see your own lock screen.
• On a phone, regardless of the lock that you choose, it’s
always easy to take a picture. Swipe left from the right edge
to bring Camera into view.
• To open Google Now from the lock screen, swipe up from
the bottom of the lock screen. Enter your PIN, pattern or
password if prompted.
For more information, visit Customise the lock screen .
Face Unlock
Face Unlock is one of the locks available. After you've set it up,
you can unlock your device just by looking at it. Although Face
Unlock is not as secure as Pattern, PIN or Password, it can be
convenient and fun to use.