Dell Inspiron 5490 AIO Display screen

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@naandhaan   What version of BIOS do you have installed?

The latest version of BIOS is 1.5.2, which, quote:

Fixed the issue where the system screen flickers and appears to be distorted after resuming from sleep mode.

Read and follow the instructions to update BIOS carefully. Manually download the update file onto your desktop. Do NOT let SupportAssist or Dell Update manage the update for you.

Make sure all apps and windows are closed. Temporarily disable your anti-viral app. Then double-click the BIOS exe file on your desktop. Leave PC alone until it's back to the desktop. PC might reboot itself several times during the update. Just leave it alone. When you're finally back at the desktop, make sure your anti-viral is running again.

Thank you RoHe  @RoHe ..

Your instruction definitely helped me but it could not find out the solution.

I understood that it is an accidental damage of screen causing it.

@DELL-Cares