Set Always-On Display to show the time or your signature while the screen is off.
How to change the clock type?
Open Settings > Display tab > Always-on display > Content , select Digital clock or Analog clock. Press SAVE to set.
How to set Signature?
Open Settings > Display tab > Always-on display > Content , select Signature.
Press NEXT, enter the text, and choose your desired FONT. Press SAVE to set