There are many reasons for the black-and-white display of the mobile phone screen, which may be caused by the user's own incorrect settings or the failure of the mobile phone system or the screen itself. The specific reasons and solutions are as follows:

Turn off reading mode or color filter.

It may be that the mobile phone has turned on the reading mode (such as adding a mobile phone) or the color filter (such as an Apple mobile phone), which can be solved by turning off the corresponding options in the system settings.

Upgrade the system or restore the factory settings.

The color display may be incorrect due to the malfunction of the mobile phone system. You can try to upgrade the system version of the mobile phone or restore the factory settings of the mobile phone.

Repair or replace faulty parts.

It may be that the screen display of the mobile phone is faulty or the connection between the screen and the motherboard is abnormal, so it is necessary to take the mobile phone to the brand maintenance center to check and replace the corresponding faulty parts.

Smart phones suitable for mainstream brands

The above methods are applicable to the current mainstream brands of smart phones.