LG V500 User Manual page 294

Lock screen
Select screen lock – Set a screen lock type to secure your tablet.
NOTE: After upgrading to Lollipop OS, your screen lock may not be
available except for Pattern, PIN and Password.
In this case, go to Apps
to delete the security certificates, and then, set up a screen lock.
Be careful when you clear credentials because all the security certificates
you have installed will be deleted.
Smart Lock – Sets to keep your tablet unlocked when you have a trusted
Bluetooth device connected to it, when it's in a familiar location like your
home or work, or when it recognizes your face.
Screen swipe effect – Sets the screen swipe effect options.
Wallpaper – Sets your Lock screen wallpaper. Select it from Gallery or
Wallpaper gallery.
Shortcuts – Allows you to change the shortcuts on the Swipe Lock screen.
Weather animation – Show animation on Lock screen when it rains or
snows in current location.
Owner info – Allows you to enter contact info to be displayed on the Lock
screen in case the tablet is lost.
Lock timer – Sets the amount of time before the screen automatically
locks after the screen has timed-out.
Power button instantly locks – Checkmark to instantly lock the screen
when the Power/Lock Key is pressed. This setting overrides the Security
lock timer setting.
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> Settings > Security > Clear credentials