This widget can be switched to show / hide unlock screen.
When unlock it every time it turns ON the panel cumbersome, you can switch OFF the unlock screen.
Even if you set the PIN, enter the PIN usually is useful when you have to unlock the screen OFF when it is not needed to use at times such as at home.
Simply touch the widget, you can switch to easily show / hide unlock screen.

When the icon is green: unlock screen will be displayed at the panel ON (normal state)
When the purple icon: unlock screen does not appear at panel ON

When you need to put a lock, be careful not to forget to unlock the screen to return to the ON.

[Note]
It is a widget, not the application.
On the screen of the application is not added anything to the installation.
Use paste the widget on the home screen.