What is OPPO Off-Screen Clock
If you're curious about the time or received any calls or messages without waking up your screen, the Off-Screen Clock function is a great tool. It shows the time and alerts you about missed calls, unread SMS, unread WeChat, and QQ messages even when your screen is off. To activate this feature, follow these simple steps.
To Enable Off-Screen Clock
Go to [Settings] > [Display & Brightness] > [Off-Screen Clock] and toggle on the option to enable it.
Then, scroll the wheel to set how long you will use the Off-Screen Clock.

Note: “Off-Screen Clock” can increase power consumption, so it won’t be displayed if the battery level is below 10% with no power supply connected. Also, the feature's availability varies per phone model.
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* Pictures, settings, and paths might differ from those of your phone, but these won't affect the description in this article