noun
lock screen
Refers to the screen displayed when a device is locked, requiring authentication to access.
スマホのロック画面に通知が表示される。
Notifications appear on the smartphone's lock screen.
ロック画面の壁紙を変えたい。
I want to change the lock screen wallpaper.
ホーム画面 is the home screen after unlocking, while ロック画面 is the locked state screen.
Compound of ロック (lock) and 画面 (screen), a straightforward modern technical term.