LG LGAS876 - Manual (Page 167)

167 Settings
The Security lock settings depend on the Screen Lock type. The
following settings may also be displayed.
Hidden pattern: Checkmark to display the pattern entry keypad when
(and where) you tap the Lock screen.
Make pattern visible: Checkmark to make your pattern visible while
drawing it.
Hidden PIN: Checkmark to display the keypad when you tap the Lock
screen.
Random PIN entry: Sets the keypad to random numbers so that
someone watching cannot detect your PIN from your hand movements.
Hidden password: Checkmark to display the keyboard when you tap the
Lock screen.
Improve face matching: Sets a more precise detection for face
matching.
Liveness check: Checkmark to require you to blink during face matching
detection (to guard against using a photo of you).
Brightness
Adjusts the brightness of the screen. For best battery performance, use
the dimmest comfortable brightness.
Screen timeout
Sets the amount of time before the screen turns off.
Screen-off effect
Sets the screen-off effect. Choose from Retro TV, Black hole, and Fade
out.
Auto-rotate screen
Checkmark to set the phone to automatically rotate the screen based on
the phone orientation (portrait or landscape).