The screen of my mobile phone is black when editing short messages and adding phone books, and all the words can't be displayed when typing, but there are still residues when reading short messages. W

The screen of my mobile phone is black when editing short messages and adding phone books, and all the words can't be displayed when typing, but there are still residues when reading short messages. What happened? The following aspects can be considered:

1. Is it already dark and you forgot to turn on the backlight of your mobile phone?

2. Did you just wake up, didn't take off your blindfold in a daze, and naturally you couldn't see anything clearly?

Did someone turn off the waiting in your room, or did the power go out?

The biggest possibility is that the mobile phone is broken.