How to do if phone appears flicker screen, spot screen problem?

Solutions:
1. First, make sure the screen is intact. It is suggested to carefully check the appearance and surrounding of the screen. If there are obvious knock marks, it is suggested to go to the authorized after-sales center for inspection.
2. Confirm whether the mobile phone system version is the latest. If it can be upgraded, it is suggested to update the system.
3. Confirm whether personality theme has been changed. If this problem occurs after changing the theme, it is recommended to use the default theme of the system to check whether it is normal.
4. Confirm whether third-party security class or software related to screen brightness setting has been downloaded. If there is no abnormality in the phone before, and it appears after installing the software, it is advised to uninstall the relevant software and restart the phone.
5. If conditions permit, it is suggested to restore the factory settings or do a flash after an effective backup. It is recommended to go to the after-sales center for inspection.
6. If the problem is not solved by the above methods, it is suggested to bring the phone to the Xiaomi authorized after-sales center for inspection.