Always-on display enables items, such as signature, analog, kaleidoscope, digital, or background to be shown when the screen is locked.
1. Go to
Settings > 
Always-on display & Lock screen > Always-on display.
2. Tap
to enable Always-on display.
1. Go to
Settings > Always-on display & Lock screen > Always-on display.2. Tap
to enable Always-on display.