Why does the screen brighten or become whiter under strong sunlight?

Problem:

The screen brightens or becomes washed out when the phone is moved to a brightly lit room environment.

Cause:

When the ambient brightness changes, such as from dark to bright, your phone automatically increases its screen brightness so you can clearly view content on the screen.

In addition, when your phone detects that the ambient lighting reaches a certain level, it will automatically enter vivid color mode.