Possible causes:

• Software: Glitches, outdated apps/OS, conflicting settings like auto-brightness or blue light filters.
• Hardware: Physical damage like cracks, water exposure, or faulty internal components.

Troubleshooting steps:

• Quick fix: Restart your phone. Often a temporary glitch is the culprit.
• Software checks:
  • Updates: Ensure your OS and apps are updated. Bugs might already have fixed.
  • Settings: Disable auto-brightness and blue light filters. Play with brightness levels.
  • Safe mode: Boot into safe mode (instructions vary by phone model) to see if it's app-related. Uninstall suspicious apps.
• Hardware checks:
  • Damage: Inspect for cracks, scratches, or water damage. Contact your phone manufacturer or a trusted repair shop.
  • Charging: Try a different cable and power outlet. Faulty connections can cause flickering.

If all else fails:

• Backup & reset: Backing up your data first, try a factory reset. This wipes everything clean and resolves software issues.
• Contact support: If nothing works, reach out to your phone manufacturer's support team for further diagnosis and repair options.