Try this solution:
Go to settings >> system >> About device.
Find "Build number" and click 6 times fast on it.
It will enable developer options menu in settings.
Come back to Home Screen, and then go back to Settings >> system >> Now you will see the Developer Options menu
Now go to Developer options >> Drawing Section or Rendering Section >> Find "Turn off hardware overlays" or "disable hardware overlays" >> This will force the phone to always use GPU for screen adjustments.
Restart your device and see no more screen blinking.