After the time expires, the computer screen goes black.
The reason is that by design, the operating system includes a function that detects when the device is locked and waits for 60 seconds. This happens even if you change the power options to never turn off the monitor or never put the computer to sleep. While the Lock screen provides useful information and beautiful pictures, you probably noticed that your computer's display turns off after 60 seconds when you lock your Windows 10 account. The new experience showcases date and time, quick status for apps you choose, and more importantly a background image, which typically, users opt to display personal pictures or those from Windows Spotlight.
On Windows 10, similar to Windows 8.1, the operating system features a Lock screen before you sign in to your account.
