Hello ARUNKMR_R,
Thanks for posting in Apple Support Communities. It sounds like this only occurs in the status bar and no other parts of your screen or apps. Right?
In that case, we'd recommend trying the steps from If your screen isn't working - Apple Support which may help resolve display issues.
1. Restart your iPhone or iPad.
2. Make sure that your screen is clean and free of any debris or water.
3. Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
4. Remove any cases or screen protectors.
If the same continues, use Get Support to reach out to Apple Support directly.
All the best.