What's the use of Samsung s2 1 lock screen wallpaper?

Mobile phone screen saver refers to a special program designed to protect the screen of mobile phone.

Its design purpose is to prevent the mobile phone screen from displaying the same picture for a long time because of unattended operation, which leads to the aging of the screen display and shortens the display life of the mobile phone screen. At present, the wallpaper picture of mobile phone lock screen is generally called mobile phone screensaver.