Lock automatically: When enabled, the screen will automatically lock when the screen times out, or after a period of time you set.
Lock instantly with power key: When enabled, pressing the Power/Lock Key locks the screen.
Set a Pattern Screen Lock
When a Pattern screen lock is set, you draw a pattern, which you create, on the screen to unlock the device. You will also set a PIN to use as a backup, in case you forget the pattern.
1.Press 
and then tap 
> Settings > My device.
2.Tap Lock screen > Screen lock.
3.Tap Pattern, and then follow the prompts to create or change your screen unlock pattern.
Configure Pattern Screen Lock Options
When you select a Pattern screen lock, you can also configure options to display on the lock screen:
1.Press 
and then tap 
> Settings > My device.
2.Tap Lock screen, and then configure these options under the Secured with pattern heading:
Lock screen widgets: When enabled, you can choose to display a clock widget, or a personal message widget to display text you enter.
•Clock or personal message: Tap to choose whether to display a clock or personal message widget on the lock screen, and then tap Save.
•Clock widget options: If you have chosen to display a clock widget on the lock screen, you can configure options for the clock widget. You can choose to display a dual clock, choose the size of the clock, and also choose whether to display the date and a personal message.
•Personal message options: If you have chosen to display a personal message widget on the lock screen, you can configure options for the message. Tap Edit personal message to enter text to display on the lock screen.
Make pattern visible: When enabled, your pattern displays briefly as you draw it.
Lock automatically: When enabled, the screen will automatically lock when the screen times out, or after a period of time you set.
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